Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 21562 insertions, 0 deletions

diff --git a/modules/ssl/Makefile.in b/modules/ssl/Makefile.in
new file mode 100644
index 0000000..4395bc3
--- /dev/null
+++ b/modules/ssl/Makefile.in
@@ -0,0 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+#   standard stuff
+#
+
+include $(top_srcdir)/build/special.mk
diff --git a/modules/ssl/NWGNUmakefile b/modules/ssl/NWGNUmakefile
new file mode 100644
index 0000000..933180f
--- /dev/null
+++ b/modules/ssl/NWGNUmakefile
@@ -0,0 +1,327 @@
+#
+# This Makefile requires the environment var OSSLSDK
+# pointing to the base directory of your OpenSSL SDK.
+# If you want to use the Novell NTLS SDK instead then
+# define NTLSSDK pointing to the base directory of the
+# SDK, and also set USE_NTLS=1
+#
+
+#
+# Declare the sub-directories to be built here
+#
+
+SUBDIRS = \
+	$(EOLIST)
+
+#
+# Get the 'head' of the build environment.  This includes default targets and
+# paths to tools
+#
+
+include $(AP_WORK)/build/NWGNUhead.inc
+
+#
+# build this level's files
+#
+# Make sure all needed macro's are defined
+#
+
+ifeq "$(USE_NTLS)" "1"
+SSL_INC = $(NTLSSDK)/inc
+SSL_LIB = $(NTLSSDK)/imp
+SSL_BIN = $(NTLSSDK)/bin
+SSL_APP = $(NTLSSDK)/apps
+ifneq "$(wildcard $(SSL_INC)/openssl/opensslv.h)" "$(SSL_INC)/openssl/opensslv.h"
+$(error '$(NTLSSDK)' does NOT point to a valid NTLS SDK!)
+endif
+else
+SSL_INC = $(OSSLSDK)/outinc_nw_libc
+SSL_LIB = $(OSSLSDK)/out_nw_libc
+SSL_BIN = $(OSSLSDK)/out_nw_libc
+SSL_APP = $(OSSLSDK)/apps
+ifneq "$(wildcard $(SSL_INC)/openssl/opensslv.h)" "$(SSL_INC)/openssl/opensslv.h"
+$(error '$(OSSLSDK)' does NOT point to a valid OpenSSL SDK!)
+endif
+endif
+
+#
+# These directories will be at the beginning of the include list, followed by
+# INCDIRS
+#
+XINCDIRS	+= \
+			$(SSL_INC) \
+			$(APR)/include \
+			$(APRUTIL)/include \
+			$(AP_WORK)/include \
+			$(AP_WORK)/modules/cache \
+			$(AP_WORK)/modules/generators \
+			$(AP_WORK)/server/mpm/NetWare \
+			$(NWOS) \
+			$(EOLIST)
+
+#
+# These flags will come after CFLAGS
+#
+XCFLAGS		+= \
+			$(EOLIST)
+
+#
+# These defines will come after DEFINES
+#
+XDEFINES	+= \
+			-DHAVE_OPENSSL \
+			$(EOLIST)
+
+#
+# These flags will be added to the link.opt file
+#
+XLFLAGS		+= \
+			-l $(SSL_LIB) \
+			$(EOLIST)
+
+#
+# These values will be appended to the correct variables based on the value of
+# RELEASE
+#
+ifeq "$(RELEASE)" "debug"
+XINCDIRS	+= \
+			$(EOLIST)
+
+XCFLAGS		+= \
+			$(EOLIST)
+
+XDEFINES	+= \
+			$(EOLIST)
+
+XLFLAGS		+= \
+			$(EOLIST)
+endif
+
+ifeq "$(RELEASE)" "noopt"
+XINCDIRS	+= \
+			$(EOLIST)
+
+XCFLAGS		+= \
+			$(EOLIST)
+
+XDEFINES	+= \
+			$(EOLIST)
+
+XLFLAGS		+= \
+			$(EOLIST)
+endif
+
+ifeq "$(RELEASE)" "release"
+XINCDIRS	+= \
+			$(EOLIST)
+
+XCFLAGS		+= \
+			$(EOLIST)
+
+XDEFINES	+= \
+			$(EOLIST)
+
+XLFLAGS		+= \
+			$(EOLIST)
+endif
+
+#
+# These are used by the link target if an NLM is being generated
+# This is used by the link 'name' directive to name the nlm.  If left blank
+# TARGET_nlm (see below) will be used.
+#
+NLM_NAME	= mod_ssl
+
+#
+# This is used by the link '-desc ' directive.
+# If left blank, NLM_NAME will be used.
+#
+ifeq "$(USE_NTLS)" "1"
+NLM_DESCRIPTION	= Apache $(VERSION_STR) SSL module (NTLS)
+else
+NLM_DESCRIPTION	= Apache $(VERSION_STR) SSL module (OpenSSL)
+endif
+
+#
+# This is used by the '-threadname' directive.  If left blank,
+# NLM_NAME Thread will be used.
+#
+NLM_THREAD_NAME	= $(NLM_NAME)
+
+#
+# If this is specified, it will override VERSION value in
+# $(AP_WORK)/build/NWGNUenvironment.inc
+#
+NLM_VERSION	=
+
+#
+# If this is specified, it will override the default of 64K
+#
+NLM_STACK_SIZE	= 8192
+
+
+#
+# If this is specified it will be used by the link '-entry' directive
+#
+NLM_ENTRY_SYM	=
+
+#
+# If this is specified it will be used by the link '-exit' directive
+#
+NLM_EXIT_SYM	=
+
+#
+# If this is specified it will be used by the link '-check' directive
+#
+NLM_CHECK_SYM	=
+
+#
+# If this is specified it will be used by the link '-flags' directive
+#
+NLM_FLAGS	=
+
+#
+# If this is specified it will be linked in with the XDCData option in the def
+# file instead of the default of $(NWOS)/apache.xdc.  XDCData can be disabled
+# by setting APACHE_UNIPROC in the environment
+#
+XDCDATA		=
+
+#
+# Declare all target files (you must add your files here)
+#
+
+#
+# If there is an NLM target, put it here
+#
+TARGET_nlm = \
+	$(OBJDIR)/$(NLM_NAME).nlm \
+	$(EOLIST)
+
+#
+# If there is an LIB target, put it here
+#
+TARGET_lib = \
+	$(EOLIST)
+
+#
+# These are the OBJ files needed to create the NLM target above.
+# Paths must all use the '/' character
+#
+FILES_nlm_objs := $(patsubst %.c,$(OBJDIR)/%.o,$(wildcard *.c))
+
+
+#
+# These are the LIB files needed to create the NLM target above.
+# These will be added as a library command in the link.opt file.
+#
+FILES_nlm_libs = \
+	$(PRELUDE) \
+	$(EOLIST)
+
+ifneq "$(USE_NTLS)" "1"
+FILES_nlm_libs += \
+	$(SSL_LIB)/crypto.lib \
+	$(SSL_LIB)/ssl.lib \
+	$(EOLIST)
+endif
+
+#
+# These are the modules that the above NLM target depends on to load.
+# These will be added as a module command in the link.opt file.
+#
+FILES_nlm_modules = \
+	Apache2 \
+	Libc \
+	$(EOLIST)
+
+ifeq "$(USE_NTLS)" "1"
+FILES_nlm_modules += ntls \
+	$(EOLIST)
+endif
+
+#
+# If the nlm has a msg file, put it's path here
+#
+FILE_nlm_msg =
+
+#
+# If the nlm has a hlp file put it's path here
+#
+FILE_nlm_hlp =
+
+#
+# If this is specified, it will override $(NWOS)\copyright.txt.
+#
+FILE_nlm_copyright =
+
+#
+# Any additional imports go here
+#
+FILES_nlm_Ximports = \
+	@libc.imp \
+	@aprlib.imp \
+	@httpd.imp \
+	$(EOLIST)
+
+# Don't link with Winsock if standard sockets are being used
+ifneq "$(USE_STDSOCKETS)" "1"
+FILES_nlm_Ximports += @ws2nlm.imp \
+	$(EOLIST)
+endif
+
+ifeq "$(USE_NTLS)" "1"
+FILES_nlm_Ximports += @ntls.imp \
+	$(EOLIST)
+else
+FILES_nlm_Ximports += \
+	GetProcessSwitchCount \
+	RunningProcess \
+	GetSuperHighResolutionTimer \
+	$(EOLIST)
+endif
+
+#
+# Any symbols exported to here
+#
+FILES_nlm_exports = \
+	ssl_module \
+	$(EOLIST)
+
+#
+# These are the OBJ files needed to create the LIB target above.
+# Paths must all use the '/' character
+#
+FILES_lib_objs = \
+	$(EOLIST)
+
+#
+# implement targets and dependancies (leave this section alone)
+#
+
+libs :: $(OBJDIR) $(TARGET_lib)
+
+nlms :: libs $(TARGET_nlm)
+
+#
+# Updated this target to create necessary directories and copy files to the
+# correct place.  (See $(AP_WORK)/build/NWGNUhead.inc for examples)
+#
+install :: nlms FORCE
+	$(call COPY,$(OBJDIR)/*.nlm,        $(INSTALLBASE)/modules/)
+	$(call COPY,$(SSL_BIN)/openssl.nlm, $(INSTALLBASE)/bin/)
+	$(call COPY,$(SSL_APP)/openssl.cnf, $(INSTALLBASE)/bin/)
+
+#
+# Any specialized rules here
+#
+vpath %.c $(AP_WORK)/modules/arch/netware
+
+#
+# Include the 'tail' makefile that has targets that depend on variables defined
+# in this makefile
+#
+
+include $(APBUILD)/NWGNUtail.inc
+
+
diff --git a/modules/ssl/README b/modules/ssl/README
new file mode 100644
index 0000000..5fc7312
--- /dev/null
+++ b/modules/ssl/README
@@ -0,0 +1,106 @@
+SYNOPSIS
+
+ This Apache module provides strong cryptography for the Apache 2 webserver
+ via the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS
+ v1) protocols by the help of the SSL/TLS implementation library OpenSSL which
+ is based on SSLeay from Eric A. Young and Tim J. Hudson. 
+
+ The mod_ssl package was created in April 1998 by Ralf S. Engelschall 
+ and was originally derived from software developed by Ben Laurie for 
+ use in the Apache-SSL HTTP server project.  The mod_ssl implementation 
+ for Apache 1.3 continues to be supported by the modssl project 
+ <http://www.modssl.org/>.
+
+SOURCES
+
+ See the top-level LAYOUT file for file descriptions.
+
+ The source files are written in clean ANSI C and pass the ``gcc -O -g
+ -ggdb3 -Wall -Wshadow -Wpointer-arith -Wcast-align -Wmissing-prototypes
+ -Wmissing-declarations -Wnested-externs -Winline'' compiler test
+ (assuming `gcc' is GCC 2.95.2 or newer) without any complains. When
+ you make changes or additions make sure the source still passes this
+ compiler test.
+
+FUNCTIONS
+  
+ Inside the source code you will be confronted with the following types of
+ functions which can be identified by their prefixes:
+
+   ap_xxxx() ............... Apache API function
+   ssl_xxxx() .............. mod_ssl function
+   SSL_xxxx() .............. OpenSSL function (SSL library)
+   OpenSSL_xxxx() .......... OpenSSL function (SSL library)
+   X509_xxxx() ............. OpenSSL function (Crypto library)
+   PEM_xxxx() .............. OpenSSL function (Crypto library)
+   EVP_xxxx() .............. OpenSSL function (Crypto library)
+   RSA_xxxx() .............. OpenSSL function (Crypto library)
+
+DATA STRUCTURES
+
+ Inside the source code you will be confronted with the following
+ data structures:
+
+   server_rec .............. Apache (Virtual) Server
+   conn_rec ................ Apache Connection
+   request_rec ............. Apache Request
+   SSLModConfig ............ mod_ssl (Global)  Module Configuration
+   SSLSrvConfig ............ mod_ssl (Virtual) Server Configuration
+   SSLDirConfig ............ mod_ssl Directory Configuration
+   SSLConnConfig ........... mod_ssl Connection Configuration
+   SSLFilterRec ............ mod_ssl Filter Context
+   SSL_CTX ................. OpenSSL Context
+   SSL_METHOD .............. OpenSSL Protocol Method
+   SSL_CIPHER .............. OpenSSL Cipher
+   SSL_SESSION ............. OpenSSL Session
+   SSL ..................... OpenSSL Connection
+   BIO ..................... OpenSSL Connection Buffer
+
+ For an overview how these are related and chained together have a look at the
+ page in README.dsov.{fig,ps}. It contains overview diagrams for those data
+ structures. It's designed for DIN A4 paper size, but you can easily generate
+ a smaller version inside XFig by specifying a magnification on the Export
+ panel.
+
+INCOMPATIBILITIES
+
+ The following intentional incompatibilities exist between mod_ssl 2.x
+ from Apache 1.3 and this mod_ssl version for Apache 2:
+
+ o The complete EAPI-based SSL_VENDOR stuff was removed.
+ o The complete EAPI-based SSL_COMPAT stuff was removed.
+ o The <IfDefine> variable MOD_SSL is no longer provided automatically 
+
+MAJOR CHANGES 
+
+ For a complete history of changes for Apache 2 mod_ssl, see the 
+ CHANGES file in the top-level directory.  The following 
+ is a condensed summary of the major changes were made between 
+ mod_ssl 2.x from Apache 1.3 and this mod_ssl version for Apache 2:
+
+ o The DBM based session cache is now based on APR's DBM API only.
+ o The shared memory based session cache is now based on APR's APIs.
+ o SSL I/O is now implemented in terms of filters rather than BUFF
+ o Eliminated ap_global_ctx. Storing Persistent information in 
+   process_rec->pool->user_data. The ssl_pphrase_Handle_CB() and 
+   ssl_config_global_* () functions have an extra parameter now - 
+   "server_rec *" -  which is used to retrieve the SSLModConfigRec.
+ o Properly support restarts, allowing mod_ssl to be added to a server
+   that is already running and to change server certs/keys on restart
+ o Various performance enhancements
+ o proxy support is no longer an "extension", much of the mod_ssl core
+   was re-written (ssl_engine_{init,kernel,config}.c) to be generic so
+   it could be re-used in proxy mode.
+   - the optional function ssl_proxy_enable is provide for mod_proxy
+     to enable proxy support
+   - proxy support now requires 'SSLProxyEngine on' to be configured
+   - proxy now supports SSLProxyCARevocation{Path,File} in addition to
+     the original SSLProxy* directives
+ o per-directory SSLCACertificate{File,Path} is now thread-safe but
+   requires SSL_set_cert_store patch to OpenSSL
+ o the ssl_engine_{ds,ext}.c source files are obsolete and no longer
+   exist
+
+TODO
+
+ See the top-level STATUS file for current efforts and goals.
diff --git a/modules/ssl/README.dsov.fig b/modules/ssl/README.dsov.fig
new file mode 100644
index 0000000..77cd2ca
--- /dev/null
+++ b/modules/ssl/README.dsov.fig
@@ -0,0 +1,346 @@
+#FIG 3.2
+Landscape
+Center
+Metric
+Letter  
+100.00
+Single
+-2
+1200 2
+0 32 #616561
+0 33 #b6b2b6
+0 34 #f7f3f7
+0 35 #cfcfcf
+0 36 #ffffff
+6 6345 2835 7155 3150
+6 6345 2970 7110 3150
+4 0 0 200 0 20 8 0.0000 4 120 585 6345 3105 "ssl_module")\001
+-6
+4 0 0 200 0 20 8 0.0000 4 120 660 6345 2970 ap_ctx_get(...,\001
+-6
+6 10800 2610 12240 3060
+4 0 0 200 0 20 8 0.0000 4 120 1170 10800 2745 ap_get_module_config(...\001
+4 0 0 200 0 20 8 0.0000 4 120 795 10800 2880 ->per_dir_config,\001
+4 0 0 200 0 20 8 0.0000 4 120 585 10800 3015 &ssl_module)\001
+-6
+6 7920 4770 9135 4995
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diff --git a/modules/ssl/README.dsov.ps b/modules/ssl/README.dsov.ps
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+gs 1 -1 sc (SSL) col0 sh gr
+/Helvetica-Bold-iso ff 180.00 scf sf
+3915 2070 m
+gs 1 -1 sc (request_rec) col0 sh gr
+$F2psEnd
+rs
+showpage
diff --git a/modules/ssl/config.m4 b/modules/ssl/config.m4
new file mode 100644
index 0000000..45eeb43
--- /dev/null
+++ b/modules/ssl/config.m4
@@ -0,0 +1,57 @@
+dnl Licensed to the Apache Software Foundation (ASF) under one or more
+dnl contributor license agreements.  See the NOTICE file distributed with
+dnl this work for additional information regarding copyright ownership.
+dnl The ASF licenses this file to You under the Apache License, Version 2.0
+dnl (the "License"); you may not use this file except in compliance with
+dnl the License.  You may obtain a copy of the License at
+dnl
+dnl      http://www.apache.org/licenses/LICENSE-2.0
+dnl
+dnl Unless required by applicable law or agreed to in writing, software
+dnl distributed under the License is distributed on an "AS IS" BASIS,
+dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+dnl See the License for the specific language governing permissions and
+dnl limitations under the License.
+
+dnl #  start of module specific part
+APACHE_MODPATH_INIT(ssl)
+
+dnl #  list of module object files
+ssl_objs="dnl
+mod_ssl.lo dnl
+ssl_engine_config.lo dnl
+ssl_engine_init.lo dnl
+ssl_engine_io.lo dnl
+ssl_engine_kernel.lo dnl
+ssl_engine_log.lo dnl
+ssl_engine_mutex.lo dnl
+ssl_engine_pphrase.lo dnl
+ssl_engine_rand.lo dnl
+ssl_engine_vars.lo dnl
+ssl_scache.lo dnl
+ssl_util_stapling.lo dnl
+ssl_util.lo dnl
+ssl_util_ssl.lo dnl
+ssl_engine_ocsp.lo dnl
+ssl_util_ocsp.lo dnl
+"
+dnl #  hook module into the Autoconf mechanism (--enable-ssl option)
+APACHE_MODULE(ssl, [SSL/TLS support (mod_ssl)], $ssl_objs, , most, [
+    APACHE_CHECK_OPENSSL
+    if test "$ac_cv_openssl" = "yes" ; then
+        if test "x$enable_ssl" = "xshared"; then
+           # The only symbol which needs to be exported is the module
+           # structure, so ask libtool to hide everything else:
+           APR_ADDTO(MOD_SSL_LDADD, [-export-symbols-regex ssl_module])
+        fi
+    else
+        enable_ssl=no
+    fi
+])
+
+# Ensure that other modules can pick up mod_ssl.h
+APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])
+
+dnl #  end of module specific part
+APACHE_MODPATH_FINISH
+
diff --git a/modules/ssl/mod_ssl.c b/modules/ssl/mod_ssl.c
new file mode 100644
index 0000000..5b8c4d5
--- /dev/null
+++ b/modules/ssl/mod_ssl.c
@@ -0,0 +1,775 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  mod_ssl.c
+ *  Apache API interface structures
+ */
+
+#include "ssl_private.h"
+#include "mod_ssl.h"
+#include "mod_ssl_openssl.h"
+#include "util_md5.h"
+#include "util_mutex.h"
+#include "ap_provider.h"
+#include "http_config.h"
+
+#include "mod_proxy.h" /* for proxy_hook_section_post_config() */
+
+#include <assert.h>
+
+static int modssl_running_statically = 0;
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, pre_handshake,
+                                    (conn_rec *c,SSL *ssl,int is_proxy),
+                                    (c,ssl,is_proxy), OK, DECLINED);
+
+/*
+ *  the table of configuration directives we provide
+ */
+
+#define SSL_CMD_ALL(name, args, desc) \
+        AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
+                       NULL, RSRC_CONF|OR_AUTHCFG, desc),
+
+#define SSL_CMD_SRV(name, args, desc) \
+        AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
+                       NULL, RSRC_CONF, desc),
+
+#define SSL_CMD_PXY(name, args, desc) \
+        AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
+                       NULL, RSRC_CONF|PROXY_CONF, desc),
+
+#define SSL_CMD_DIR(name, type, args, desc) \
+        AP_INIT_##args("SSL"#name, ssl_cmd_SSL##name, \
+                       NULL, OR_##type, desc),
+
+#define AP_END_CMD { NULL }
+
+static const command_rec ssl_config_cmds[] = {
+    /*
+     * Global (main-server) context configuration directives
+     */
+    SSL_CMD_SRV(PassPhraseDialog, TAKE1,
+                "SSL dialog mechanism for the pass phrase query "
+                "('builtin', '|/path/to/pipe_program', "
+                "or 'exec:/path/to/cgi_program')")
+    SSL_CMD_SRV(SessionCache, TAKE1,
+                "SSL Session Cache storage "
+                "('none', 'nonenotnull', 'dbm:/path/to/file')")
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    SSL_CMD_SRV(CryptoDevice, TAKE1,
+                "SSL external Crypto Device usage "
+                "('builtin', '...')")
+#endif
+    SSL_CMD_SRV(RandomSeed, TAKE23,
+                "SSL Pseudo Random Number Generator (PRNG) seeding source "
+                "('startup|connect builtin|file:/path|exec:/path [bytes]')")
+
+    /*
+     * Per-server context configuration directives
+     */
+    SSL_CMD_SRV(Engine, TAKE1,
+                "SSL switch for the protocol engine "
+                "('on', 'off')")
+    SSL_CMD_SRV(FIPS, FLAG,
+                "Enable FIPS-140 mode "
+                "(`on', `off')")
+    SSL_CMD_ALL(CipherSuite, TAKE12,
+                "Colon-delimited list of permitted SSL Ciphers, optional preceded "
+                "by protocol identifier ('XXX:...:XXX' - see manual)")
+    SSL_CMD_SRV(CertificateFile, TAKE1,
+                "SSL Server Certificate file "
+                "('/path/to/file' - PEM or DER encoded)")
+    SSL_CMD_SRV(CertificateKeyFile, TAKE1,
+                "SSL Server Private Key file "
+                "('/path/to/file' - PEM or DER encoded)")
+    SSL_CMD_SRV(CertificateChainFile, TAKE1,
+                "SSL Server CA Certificate Chain file "
+                "('/path/to/file' - PEM encoded)")
+#ifdef HAVE_TLS_SESSION_TICKETS
+    SSL_CMD_SRV(SessionTicketKeyFile, TAKE1,
+                "TLS session ticket encryption/decryption key file (RFC 5077) "
+                "('/path/to/file' - file with 48 bytes of random data)")
+#endif
+    SSL_CMD_ALL(CACertificatePath, TAKE1,
+                "SSL CA Certificate path "
+                "('/path/to/dir' - contains PEM encoded files)")
+    SSL_CMD_ALL(CACertificateFile, TAKE1,
+                "SSL CA Certificate file "
+                "('/path/to/file' - PEM encoded)")
+    SSL_CMD_SRV(CADNRequestPath, TAKE1,
+                "SSL CA Distinguished Name path "
+                "('/path/to/dir' - symlink hashes to PEM of acceptable CA names to request)")
+    SSL_CMD_SRV(CADNRequestFile, TAKE1,
+                "SSL CA Distinguished Name file "
+                "('/path/to/file' - PEM encoded to derive acceptable CA names to request)")
+    SSL_CMD_SRV(CARevocationPath, TAKE1,
+                "SSL CA Certificate Revocation List (CRL) path "
+                "('/path/to/dir' - contains PEM encoded files)")
+    SSL_CMD_SRV(CARevocationFile, TAKE1,
+                "SSL CA Certificate Revocation List (CRL) file "
+                "('/path/to/file' - PEM encoded)")
+    SSL_CMD_SRV(CARevocationCheck, RAW_ARGS,
+                "SSL CA Certificate Revocation List (CRL) checking mode")
+    SSL_CMD_ALL(VerifyClient, TAKE1,
+                "SSL Client verify type "
+                "('none', 'optional', 'require', 'optional_no_ca')")
+    SSL_CMD_ALL(VerifyDepth, TAKE1,
+                "SSL Client verify depth "
+                "('N' - number of intermediate certificates)")
+    SSL_CMD_SRV(SessionCacheTimeout, TAKE1,
+                "SSL Session Cache object lifetime "
+                "('N' - number of seconds)")
+#ifdef OPENSSL_NO_SSL3
+#define SSLv3_PROTO_PREFIX ""
+#else
+#define SSLv3_PROTO_PREFIX "SSLv3|"
+#endif
+#ifdef HAVE_TLSV1_X
+#define SSL_PROTOCOLS SSLv3_PROTO_PREFIX "TLSv1|TLSv1.1|TLSv1.2"
+#else
+#define SSL_PROTOCOLS SSLv3_PROTO_PREFIX "TLSv1"
+#endif
+    SSL_CMD_SRV(Protocol, RAW_ARGS,
+                "Enable or disable various SSL protocols "
+                "('[+-][" SSL_PROTOCOLS "] ...' - see manual)")
+    SSL_CMD_SRV(HonorCipherOrder, FLAG,
+                "Use the server's cipher ordering preference")
+    SSL_CMD_SRV(Compression, FLAG,
+                "Enable SSL level compression "
+                "(`on', `off')")
+    SSL_CMD_SRV(SessionTickets, FLAG,
+                "Enable or disable TLS session tickets"
+                "(`on', `off')")
+    SSL_CMD_SRV(InsecureRenegotiation, FLAG,
+                "Enable support for insecure renegotiation")
+    SSL_CMD_ALL(UserName, TAKE1,
+                "Set user name to SSL variable value")
+    SSL_CMD_SRV(StrictSNIVHostCheck, FLAG,
+                "Strict SNI virtual host checking")
+
+#ifdef HAVE_SRP
+    SSL_CMD_SRV(SRPVerifierFile, TAKE1,
+                "SRP verifier file "
+                "('/path/to/file' - created by srptool)")
+    SSL_CMD_SRV(SRPUnknownUserSeed, TAKE1,
+                "SRP seed for unknown users (to avoid leaking a user's existence) "
+                "('some secret text')")
+#endif
+
+    /*
+     * Proxy configuration for remote SSL connections
+     */
+    SSL_CMD_PXY(ProxyEngine, FLAG,
+                "SSL switch for the proxy protocol engine "
+                "('on', 'off')")
+    SSL_CMD_PXY(ProxyProtocol, RAW_ARGS,
+               "SSL Proxy: enable or disable SSL protocol flavors "
+                "('[+-][" SSL_PROTOCOLS "] ...' - see manual)")
+    SSL_CMD_PXY(ProxyCipherSuite, TAKE12,
+               "SSL Proxy: colon-delimited list of permitted SSL ciphers "
+               ", optionally preceded by protocol specifier ('XXX:...:XXX' - see manual)")
+    SSL_CMD_PXY(ProxyVerify, TAKE1,
+               "SSL Proxy: whether to verify the remote certificate "
+               "('on' or 'off')")
+    SSL_CMD_PXY(ProxyVerifyDepth, TAKE1,
+               "SSL Proxy: maximum certificate verification depth "
+               "('N' - number of intermediate certificates)")
+    SSL_CMD_PXY(ProxyCACertificateFile, TAKE1,
+               "SSL Proxy: file containing server certificates "
+               "('/path/to/file' - PEM encoded certificates)")
+    SSL_CMD_PXY(ProxyCACertificatePath, TAKE1,
+               "SSL Proxy: directory containing server certificates "
+               "('/path/to/dir' - contains PEM encoded certificates)")
+    SSL_CMD_PXY(ProxyCARevocationPath, TAKE1,
+                "SSL Proxy: CA Certificate Revocation List (CRL) path "
+                "('/path/to/dir' - contains PEM encoded files)")
+    SSL_CMD_PXY(ProxyCARevocationFile, TAKE1,
+                "SSL Proxy: CA Certificate Revocation List (CRL) file "
+                "('/path/to/file' - PEM encoded)")
+    SSL_CMD_PXY(ProxyCARevocationCheck, RAW_ARGS,
+                "SSL Proxy: CA Certificate Revocation List (CRL) checking mode")
+    SSL_CMD_PXY(ProxyMachineCertificateFile, TAKE1,
+               "SSL Proxy: file containing client certificates "
+               "('/path/to/file' - PEM encoded certificates)")
+    SSL_CMD_PXY(ProxyMachineCertificatePath, TAKE1,
+               "SSL Proxy: directory containing client certificates "
+               "('/path/to/dir' - contains PEM encoded certificates)")
+    SSL_CMD_PXY(ProxyMachineCertificateChainFile, TAKE1,
+               "SSL Proxy: file containing issuing certificates "
+               "of the client certificate "
+               "(`/path/to/file' - PEM encoded certificates)")
+    SSL_CMD_PXY(ProxyCheckPeerExpire, FLAG,
+                "SSL Proxy: check the peer certificate's expiration date")
+    SSL_CMD_PXY(ProxyCheckPeerCN, FLAG,
+                "SSL Proxy: check the peer certificate's CN")
+    SSL_CMD_PXY(ProxyCheckPeerName, FLAG,
+                "SSL Proxy: check the peer certificate's name "
+                "(must be present in subjectAltName extension or CN")
+
+    /*
+     * Per-directory context configuration directives
+     */
+    SSL_CMD_DIR(Options, OPTIONS, RAW_ARGS,
+               "Set one or more options to configure the SSL engine"
+               "('[+-]option[=value] ...' - see manual)")
+    SSL_CMD_DIR(RequireSSL, AUTHCFG, NO_ARGS,
+               "Require the SSL protocol for the per-directory context "
+               "(no arguments)")
+    SSL_CMD_DIR(Require, AUTHCFG, RAW_ARGS,
+               "Require a boolean expression to evaluate to true for granting access"
+               "(arbitrary complex boolean expression - see manual)")
+    SSL_CMD_DIR(RenegBufferSize, AUTHCFG, TAKE1,
+                "Configure the amount of memory that will be used for buffering the "
+                "request body if a per-location SSL renegotiation is required due to "
+                "changed access control requirements")
+
+    SSL_CMD_SRV(OCSPEnable, RAW_ARGS,
+               "Enable use of OCSP to verify certificate revocation mode ('on', 'leaf', 'off')")
+    SSL_CMD_SRV(OCSPDefaultResponder, TAKE1,
+               "URL of the default OCSP Responder")
+    SSL_CMD_SRV(OCSPOverrideResponder, FLAG,
+               "Force use of the default responder URL ('on', 'off')")
+    SSL_CMD_SRV(OCSPResponseTimeSkew, TAKE1,
+                "Maximum time difference in OCSP responses")
+    SSL_CMD_SRV(OCSPResponseMaxAge, TAKE1,
+                "Maximum age of OCSP responses")
+    SSL_CMD_SRV(OCSPResponderTimeout, TAKE1,
+                "OCSP responder query timeout")
+    SSL_CMD_SRV(OCSPUseRequestNonce, FLAG,
+                "Whether OCSP queries use a nonce or not ('on', 'off')")
+    SSL_CMD_SRV(OCSPProxyURL, TAKE1,
+                "Proxy URL to use for OCSP requests")
+
+/* Define OCSP Responder Certificate Verification Directive */
+    SSL_CMD_SRV(OCSPNoVerify, FLAG,
+                "Do not verify OCSP Responder certificate ('on', 'off')")
+/* Define OCSP Responder File Configuration Directive */
+    SSL_CMD_SRV(OCSPResponderCertificateFile, TAKE1,
+               "Trusted OCSP responder certificates"
+               "(`/path/to/file' - PEM encoded certificates)")
+
+#ifdef HAVE_OCSP_STAPLING
+    /*
+     * OCSP Stapling options
+     */
+    SSL_CMD_SRV(StaplingCache, TAKE1,
+                "SSL Stapling Response Cache storage "
+                "(`dbm:/path/to/file')")
+    SSL_CMD_SRV(UseStapling, FLAG,
+                "SSL switch for the OCSP Stapling protocol " "(`on', `off')")
+    SSL_CMD_SRV(StaplingResponseTimeSkew, TAKE1,
+                "SSL stapling option for maximum time difference in OCSP responses")
+    SSL_CMD_SRV(StaplingResponderTimeout, TAKE1,
+                "SSL stapling option for OCSP responder timeout")
+    SSL_CMD_SRV(StaplingResponseMaxAge, TAKE1,
+                "SSL stapling option for maximum age of OCSP responses")
+    SSL_CMD_SRV(StaplingStandardCacheTimeout, TAKE1,
+                "SSL stapling option for normal OCSP Response Cache Lifetime")
+    SSL_CMD_SRV(StaplingReturnResponderErrors, FLAG,
+                "SSL stapling switch to return Status Errors Back to Client"
+                "(`on', `off')")
+    SSL_CMD_SRV(StaplingFakeTryLater, FLAG,
+                "SSL stapling switch to send tryLater response to client on error "
+                "(`on', `off')")
+    SSL_CMD_SRV(StaplingErrorCacheTimeout, TAKE1,
+                "SSL stapling option for OCSP Response Error Cache Lifetime")
+    SSL_CMD_SRV(StaplingForceURL, TAKE1,
+                "SSL stapling option to Force the OCSP Stapling URL")
+#endif
+
+#ifdef HAVE_SSL_CONF_CMD
+    SSL_CMD_SRV(OpenSSLConfCmd, TAKE2,
+                "OpenSSL configuration command")
+#endif
+
+    /* Deprecated directives. */
+    AP_INIT_RAW_ARGS("SSLLog", ap_set_deprecated, NULL, OR_ALL,
+      "SSLLog directive is no longer supported - use ErrorLog."),
+    AP_INIT_RAW_ARGS("SSLLogLevel", ap_set_deprecated, NULL, OR_ALL,
+      "SSLLogLevel directive is no longer supported - use LogLevel."),
+
+    AP_END_CMD
+};
+
+/*
+ *  the various processing hooks
+ */
+static int modssl_is_prelinked(void)
+{
+    apr_size_t i = 0;
+    const module *mod;
+    while ((mod = ap_prelinked_modules[i++])) {
+        if (strcmp(mod->name, "mod_ssl.c") == 0) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+static apr_status_t ssl_cleanup_pre_config(void *data)
+{
+#if HAVE_OPENSSL_INIT_SSL || (OPENSSL_VERSION_NUMBER >= 0x10100000L && \
+                              !defined(LIBRESSL_VERSION_NUMBER))
+    /* Openssl v1.1+ handles all termination automatically from
+     * OPENSSL_init_ssl(). Do nothing in this case.
+     */
+
+#else
+    /* Termination below is for legacy Openssl versions v1.0.x and
+     * older.
+     */
+
+    /* Corresponds to OBJ_create()s */
+    OBJ_cleanup();
+    /* Corresponds to OPENSSL_load_builtin_modules() */
+    CONF_modules_free();
+    /* Corresponds to SSL_library_init: */
+    EVP_cleanup();
+#if HAVE_ENGINE_LOAD_BUILTIN_ENGINES
+    ENGINE_cleanup();
+#endif
+#if OPENSSL_VERSION_NUMBER >= 0x1000200fL
+#ifndef OPENSSL_NO_COMP
+    SSL_COMP_free_compression_methods();
+#endif
+#endif
+
+    /* Usually needed per thread, but this parent process is single-threaded */
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#if OPENSSL_VERSION_NUMBER >= 0x1000000fL
+    ERR_remove_thread_state(NULL);
+#else
+    ERR_remove_state(0);
+#endif
+#endif
+
+    /* Don't call ERR_free_strings in earlier versions, ERR_load_*_strings only
+     * actually loaded the error strings once per process due to static
+     * variable abuse in OpenSSL. */
+#if (OPENSSL_VERSION_NUMBER >= 0x00090805f)
+    ERR_free_strings();
+#endif
+
+    /* Also don't call CRYPTO_cleanup_all_ex_data when linked statically here;
+     * any registered ex_data indices may have been cached in static variables
+     * in OpenSSL; removing them may cause havoc.  Notably, with OpenSSL
+     * versions >= 0.9.8f, COMP_CTX cleanups would not be run, which
+     * could result in a per-connection memory leak (!). */
+    if (!modssl_running_statically) {
+        CRYPTO_cleanup_all_ex_data();
+    }
+#endif
+
+    /*
+     * TODO: determine somewhere we can safely shove out diagnostics
+     *       (when enabled) at this late stage in the game:
+     * CRYPTO_mem_leaks_fp(stderr);
+     */
+
+    return APR_SUCCESS;
+}
+
+static int ssl_hook_pre_config(apr_pool_t *pconf,
+                               apr_pool_t *plog,
+                               apr_pool_t *ptemp)
+{
+    modssl_running_statically = modssl_is_prelinked();
+
+#if HAVE_OPENSSL_INIT_SSL || (OPENSSL_VERSION_NUMBER >= 0x10100000L && \
+                              !defined(LIBRESSL_VERSION_NUMBER))
+    /* Openssl v1.1+ handles all initialisation automatically, apart
+     * from hints as to how we want to use the library.
+     *
+     * We tell openssl we want to include engine support.
+     */
+    OPENSSL_init_ssl(OPENSSL_INIT_ENGINE_ALL_BUILTIN, NULL);
+
+#else
+    /* Configuration below is for legacy versions Openssl v1.0 and
+     * older.
+     */
+
+#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API
+    ssl_util_thread_id_setup(pconf);
+#endif
+#if MODSSL_USE_OPENSSL_PRE_1_1_API || defined(LIBRESSL_VERSION_NUMBER)
+    (void)CRYPTO_malloc_init();
+#else
+    OPENSSL_malloc_init();
+#endif
+    ERR_load_crypto_strings();
+    SSL_load_error_strings();
+    SSL_library_init();
+#if HAVE_ENGINE_LOAD_BUILTIN_ENGINES
+    ENGINE_load_builtin_engines();
+#endif
+    OpenSSL_add_all_algorithms();
+    OPENSSL_load_builtin_modules();
+#endif
+
+    if (OBJ_txt2nid("id-on-dnsSRV") == NID_undef) {
+        (void)OBJ_create("1.3.6.1.5.5.7.8.7", "id-on-dnsSRV",
+                         "SRVName otherName form");
+    }
+
+    /* Start w/o errors (e.g. OBJ_txt2nid() above) */
+    ERR_clear_error();
+
+    /*
+     * Let us cleanup the ssl library when the module is unloaded
+     */
+    apr_pool_cleanup_register(pconf, NULL, ssl_cleanup_pre_config,
+                                           apr_pool_cleanup_null);
+
+    /* Register us to handle mod_log_config %c/%x variables */
+    ssl_var_log_config_register(pconf);
+
+    /* Register to handle mod_status status page generation */
+    ssl_scache_status_register(pconf);
+
+    /* Register mutex type names so they can be configured with Mutex */
+    ap_mutex_register(pconf, SSL_CACHE_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
+#ifdef HAVE_OCSP_STAPLING
+    ap_mutex_register(pconf, SSL_STAPLING_CACHE_MUTEX_TYPE, NULL,
+                      APR_LOCK_DEFAULT, 0);
+    ap_mutex_register(pconf, SSL_STAPLING_REFRESH_MUTEX_TYPE, NULL,
+                      APR_LOCK_DEFAULT, 0);
+#endif
+
+    return OK;
+}
+
+static SSLConnRec *ssl_init_connection_ctx(conn_rec *c,
+                                           ap_conf_vector_t *per_dir_config,
+                                           int reinit)
+{
+    SSLConnRec *sslconn = myConnConfig(c);
+    int need_setup = 0;
+
+    /* mod_proxy's (r->)per_dir_config has the lifetime of the request, thus
+     * it uses ssl_engine_set() to reset sslconn->dc when reusing SSL backend
+     * connections, so we must fall through here. But in the case where we are
+     * called from ssl_init_ssl_connection() with no per_dir_config (which also
+     * includes mod_proxy's later run_pre_connection call), sslconn->dc should
+     * be preserved if it's already set.
+     */
+    if (!sslconn) {
+        sslconn = apr_pcalloc(c->pool, sizeof(*sslconn));
+        need_setup = 1;
+    }
+    else if (!reinit) {
+        return sslconn;
+    }
+
+    /* Reinit dc in any case because it may be r->per_dir_config scoped
+     * and thus a caller like mod_proxy needs to update it per request.
+     */
+    if (per_dir_config) {
+        sslconn->dc = ap_get_module_config(per_dir_config, &ssl_module);
+    }
+    else {
+        sslconn->dc = ap_get_module_config(c->base_server->lookup_defaults,
+                                           &ssl_module);
+    }
+
+    if (need_setup) {
+        sslconn->server = c->base_server;
+        sslconn->verify_depth = UNSET;
+        if (c->outgoing) {
+            sslconn->cipher_suite = sslconn->dc->proxy->auth.cipher_suite;
+        }
+        else {
+            SSLSrvConfigRec *sc = mySrvConfig(c->base_server);
+            sslconn->cipher_suite = sc->server->auth.cipher_suite;
+        }
+
+        myConnConfigSet(c, sslconn);
+    }
+
+    return sslconn;
+}
+
+static int ssl_engine_status(conn_rec *c, SSLConnRec *sslconn)
+{
+    if (c->master) {
+        return DECLINED;
+    }
+    if (sslconn) {
+        /* This connection has already been configured. Check what applies. */
+        if (sslconn->disabled) {
+            return SUSPENDED;
+        }
+        if (c->outgoing) {
+            if (!sslconn->dc->proxy_enabled) {
+                return DECLINED;
+            }
+        }
+        else {
+            if (mySrvConfig(sslconn->server)->enabled != SSL_ENABLED_TRUE) {
+                return DECLINED;
+            }
+        }
+    }
+    else {
+        /* we decline by default for outgoing connections and for incoming
+         * where the base_server is not enabled. */
+        if (c->outgoing || mySrvConfig(c->base_server)->enabled != SSL_ENABLED_TRUE) {
+            return DECLINED;
+        }
+    }
+    return OK;
+}
+
+static int ssl_hook_ssl_bind_outgoing(conn_rec *c,
+                                 ap_conf_vector_t *per_dir_config,
+                                 int enable_ssl)
+{
+    SSLConnRec *sslconn;
+    int status;
+
+    sslconn = ssl_init_connection_ctx(c, per_dir_config, 1);
+    if (sslconn->ssl) {
+        /* we are already bound to this connection. We have rebound
+         * or removed the reference to a previous per_dir_config,
+         * there is nothing more to do. */
+        return OK;
+    }
+
+    status = ssl_engine_status(c, sslconn);
+    if (enable_ssl) {
+        if (status != OK) {
+            SSLSrvConfigRec *sc = mySrvConfig(sslconn->server);
+            sslconn->disabled = 1;
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(10272)
+                          "SSL Proxy requested for %s but not enabled for us.",
+                          sc->vhost_id);
+        }
+        else {
+            sslconn->disabled = 0;
+            return OK;
+        }
+    }
+    else {
+        sslconn->disabled = 1;
+    }
+    return DECLINED;
+}
+
+int ssl_init_ssl_connection(conn_rec *c, request_rec *r)
+{
+    SSLSrvConfigRec *sc;
+    SSL *ssl;
+    SSLConnRec *sslconn;
+    char *vhost_md5;
+    int rc;
+    modssl_ctx_t *mctx;
+    server_rec *server;
+
+    /*
+     * Create or retrieve SSL context
+     */
+    sslconn = ssl_init_connection_ctx(c, r ? r->per_dir_config : NULL, 0);
+    server = sslconn->server;
+    sc = mySrvConfig(server);
+
+    /*
+     * Seed the Pseudo Random Number Generator (PRNG)
+     */
+    ssl_rand_seed(server, c->pool, SSL_RSCTX_CONNECT,
+                  c->outgoing ? "Proxy: " : "Server: ");
+
+    mctx = myConnCtxConfig(c, sc);
+
+    /*
+     * Create a new SSL connection with the configured server SSL context and
+     * attach this to the socket. Additionally we register this attachment
+     * so we can detach later.
+     */
+    if (!(sslconn->ssl = ssl = SSL_new(mctx->ssl_ctx))) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01962)
+                      "Unable to create a new SSL connection from the SSL "
+                      "context");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, server);
+
+        c->aborted = 1;
+
+        return DECLINED; /* XXX */
+    }
+
+    rc = ssl_run_pre_handshake(c, ssl, c->outgoing ? 1 : 0);
+    if (rc != OK && rc != DECLINED) {
+        return rc;
+    }
+
+    vhost_md5 = ap_md5_binary(c->pool, (unsigned char *)sc->vhost_id,
+                              sc->vhost_id_len);
+
+    if (!SSL_set_session_id_context(ssl, (unsigned char *)vhost_md5,
+                                    APR_MD5_DIGESTSIZE*2))
+    {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01963)
+                      "Unable to set session id context to '%s'", vhost_md5);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, server);
+
+        c->aborted = 1;
+
+        return DECLINED; /* XXX */
+    }
+
+    SSL_set_app_data(ssl, c);
+    modssl_set_app_data2(ssl, NULL); /* will be request_rec */
+
+    SSL_set_verify_result(ssl, X509_V_OK);
+
+    ssl_io_filter_init(c, r, ssl);
+
+    return APR_SUCCESS;
+}
+
+static const char *ssl_hook_http_scheme(const request_rec *r)
+{
+    return modssl_request_is_tls(r, NULL) ? "https" : NULL;
+}
+
+static apr_port_t ssl_hook_default_port(const request_rec *r)
+{
+    return modssl_request_is_tls(r, NULL) ? 443 : 0;
+}
+
+static int ssl_hook_pre_connection(conn_rec *c, void *csd)
+{
+    SSLSrvConfigRec *sc;
+    SSLConnRec *sslconn = myConnConfig(c);
+
+    /*
+     * Immediately stop processing if SSL is disabled for this connection
+     */
+    if (ssl_engine_status(c, sslconn) != OK) {
+        return DECLINED;
+    }
+
+    if (sslconn) {
+        sc = mySrvConfig(sslconn->server);
+    }
+    else {
+        sc = mySrvConfig(c->base_server);
+    }
+
+    /*
+     * Remember the connection information for
+     * later access inside callback functions
+     */
+
+    ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(01964)
+                  "Connection to child %ld established "
+                  "(server %s)", c->id, sc->vhost_id);
+
+    return ssl_init_ssl_connection(c, NULL);
+}
+
+static int ssl_hook_process_connection(conn_rec* c)
+{
+    SSLConnRec *sslconn = myConnConfig(c);
+
+    if (sslconn && !sslconn->disabled) {
+        /* On an active SSL connection, let the input filters initialize
+         * themselves which triggers the handshake, which again triggers
+         * all kinds of useful things such as SNI and ALPN.
+         */
+        apr_bucket_brigade* temp;
+
+        temp = apr_brigade_create(c->pool, c->bucket_alloc);
+        ap_get_brigade(c->input_filters, temp,
+                       AP_MODE_INIT, APR_BLOCK_READ, 0);
+        apr_brigade_destroy(temp);
+    }
+    
+    return DECLINED;
+}
+
+/*
+ *  the module registration phase
+ */
+
+static void ssl_register_hooks(apr_pool_t *p)
+{
+    /* ssl_hook_ReadReq needs to use the BrowserMatch settings so must
+     * run after mod_setenvif's post_read_request hook. */
+    static const char *pre_prr[] = { "mod_setenvif.c", NULL };
+    /* The ssl_init_Module post_config hook should run before mod_proxy's
+     * for the ssl proxy main configs to be merged with vhosts' before being
+     * themselves merged with mod_proxy's in proxy_hook_section_post_config.
+     */
+    static const char *b_pc[] = { "mod_proxy.c", NULL};
+
+
+    ssl_io_filter_register(p);
+
+    ap_hook_pre_connection(ssl_hook_pre_connection,NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_process_connection(ssl_hook_process_connection, 
+                                                   NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_test_config   (ssl_hook_ConfigTest,    NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_config   (ssl_init_Module,        NULL,b_pc, APR_HOOK_MIDDLE);
+    ap_hook_http_scheme   (ssl_hook_http_scheme,   NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_default_port  (ssl_hook_default_port,  NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_pre_config    (ssl_hook_pre_config,    NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_child_init    (ssl_init_Child,         NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_authn   (ssl_hook_UserCheck,     NULL,NULL, APR_HOOK_FIRST,
+                           AP_AUTH_INTERNAL_PER_CONF);
+    ap_hook_fixups        (ssl_hook_Fixup,         NULL,NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_access  (ssl_hook_Access,        NULL,NULL, APR_HOOK_MIDDLE,
+                           AP_AUTH_INTERNAL_PER_CONF);
+    ap_hook_check_authz   (ssl_hook_Auth,          NULL,NULL, APR_HOOK_MIDDLE,
+                           AP_AUTH_INTERNAL_PER_CONF);
+    ap_hook_post_read_request(ssl_hook_ReadReq, pre_prr,NULL, APR_HOOK_MIDDLE);
+
+    APR_OPTIONAL_HOOK(proxy, section_post_config,
+                      ssl_proxy_section_post_config, NULL, NULL,
+                      APR_HOOK_MIDDLE);
+
+    ssl_var_register(p);
+    ap_hook_ssl_bind_outgoing  (ssl_hook_ssl_bind_outgoing, NULL, NULL, APR_HOOK_MIDDLE);
+
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "ssl",
+                              AUTHZ_PROVIDER_VERSION,
+                              &ssl_authz_provider_require_ssl,
+                              AP_AUTH_INTERNAL_PER_CONF);
+
+    ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "ssl-verify-client",
+                              AUTHZ_PROVIDER_VERSION,
+                              &ssl_authz_provider_verify_client,
+                              AP_AUTH_INTERNAL_PER_CONF);
+}
+
+module AP_MODULE_DECLARE_DATA ssl_module = {
+    STANDARD20_MODULE_STUFF,
+    ssl_config_perdir_create,   /* create per-dir    config structures */
+    ssl_config_perdir_merge,    /* merge  per-dir    config structures */
+    ssl_config_server_create,   /* create per-server config structures */
+    ssl_config_server_merge,    /* merge  per-server config structures */
+    ssl_config_cmds,            /* table of configuration directives   */
+    ssl_register_hooks          /* register hooks */
+#if defined(AP_MODULE_HAS_FLAGS)
+   ,AP_MODULE_FLAG_ALWAYS_MERGE /* flags */
+#endif
+};
diff --git a/modules/ssl/mod_ssl.dep b/modules/ssl/mod_ssl.dep
new file mode 100644
index 0000000..323d0f6
--- /dev/null
+++ b/modules/ssl/mod_ssl.dep
@@ -0,0 +1,1086 @@
+# Microsoft Developer Studio Generated Dependency File, included by mod_ssl.mak
+
+.\mod_ssl.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_md5.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_md5.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\mod_ssl.h"\
+	".\mod_ssl_openssl.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_config.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_init.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_mpm.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\mpm_common.h"\
+	"..\..\include\os.h"\
+	"..\..\include\scoreboard.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\mod_ssl.h"\
+	".\mod_ssl_openssl.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_io.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_date.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\mod_ssl.h"\
+	".\mod_ssl_openssl.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_kernel.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\scoreboard.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_md5.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_md5.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\mod_ssl.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_log.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_mutex.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_ocsp.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_base64.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_pphrase.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_rand.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_engine_vars.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\scoreboard.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	"..\loggers\mod_log_config.h"\
+	".\mod_ssl.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_scache.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	"..\generators\mod_status.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_util.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_mpm.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\scoreboard.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_util_ocsp.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_util_ssl.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+.\ssl_util_stapling.c : \
+	"..\..\include\ap_config.h"\
+	"..\..\include\ap_config_layout.h"\
+	"..\..\include\ap_expr.h"\
+	"..\..\include\ap_hooks.h"\
+	"..\..\include\ap_mmn.h"\
+	"..\..\include\ap_mpm.h"\
+	"..\..\include\ap_provider.h"\
+	"..\..\include\ap_regex.h"\
+	"..\..\include\ap_release.h"\
+	"..\..\include\ap_socache.h"\
+	"..\..\include\apache_noprobes.h"\
+	"..\..\include\http_config.h"\
+	"..\..\include\http_connection.h"\
+	"..\..\include\http_core.h"\
+	"..\..\include\http_log.h"\
+	"..\..\include\http_main.h"\
+	"..\..\include\http_protocol.h"\
+	"..\..\include\http_request.h"\
+	"..\..\include\http_vhost.h"\
+	"..\..\include\httpd.h"\
+	"..\..\include\mod_auth.h"\
+	"..\..\include\os.h"\
+	"..\..\include\scoreboard.h"\
+	"..\..\include\util_cfgtree.h"\
+	"..\..\include\util_charset.h"\
+	"..\..\include\util_ebcdic.h"\
+	"..\..\include\util_filter.h"\
+	"..\..\include\util_mutex.h"\
+	"..\..\include\util_script.h"\
+	"..\..\srclib\apr-util\include\apr_buckets.h"\
+	"..\..\srclib\apr-util\include\apr_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_optional.h"\
+	"..\..\srclib\apr-util\include\apr_optional_hooks.h"\
+	"..\..\srclib\apr-util\include\apr_uri.h"\
+	"..\..\srclib\apr-util\include\apr_xlate.h"\
+	"..\..\srclib\apr-util\include\apu.h"\
+	"..\..\srclib\apr\include\apr.h"\
+	"..\..\srclib\apr\include\apr_allocator.h"\
+	"..\..\srclib\apr\include\apr_dso.h"\
+	"..\..\srclib\apr\include\apr_errno.h"\
+	"..\..\srclib\apr\include\apr_file_info.h"\
+	"..\..\srclib\apr\include\apr_file_io.h"\
+	"..\..\srclib\apr\include\apr_fnmatch.h"\
+	"..\..\srclib\apr\include\apr_general.h"\
+	"..\..\srclib\apr\include\apr_global_mutex.h"\
+	"..\..\srclib\apr\include\apr_hash.h"\
+	"..\..\srclib\apr\include\apr_inherit.h"\
+	"..\..\srclib\apr\include\apr_lib.h"\
+	"..\..\srclib\apr\include\apr_mmap.h"\
+	"..\..\srclib\apr\include\apr_network_io.h"\
+	"..\..\srclib\apr\include\apr_poll.h"\
+	"..\..\srclib\apr\include\apr_pools.h"\
+	"..\..\srclib\apr\include\apr_portable.h"\
+	"..\..\srclib\apr\include\apr_proc_mutex.h"\
+	"..\..\srclib\apr\include\apr_ring.h"\
+	"..\..\srclib\apr\include\apr_shm.h"\
+	"..\..\srclib\apr\include\apr_strings.h"\
+	"..\..\srclib\apr\include\apr_tables.h"\
+	"..\..\srclib\apr\include\apr_thread_mutex.h"\
+	"..\..\srclib\apr\include\apr_thread_proc.h"\
+	"..\..\srclib\apr\include\apr_time.h"\
+	"..\..\srclib\apr\include\apr_user.h"\
+	"..\..\srclib\apr\include\apr_want.h"\
+	".\ssl_private.h"\
+	".\ssl_util_ssl.h"\
+	
+
+..\..\build\win32\httpd.rc : \
+	"..\..\include\ap_release.h"\
+	
diff --git a/modules/ssl/mod_ssl.dsp b/modules/ssl/mod_ssl.dsp
new file mode 100644
index 0000000..65b554d
--- /dev/null
+++ b/modules/ssl/mod_ssl.dsp
@@ -0,0 +1,195 @@
+# Microsoft Developer Studio Project File - Name="mod_ssl" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+
+CFG=mod_ssl - Win32 Release
+!MESSAGE This is not a valid makefile. To build this project using NMAKE,
+!MESSAGE use the Export Makefile command and run
+!MESSAGE 
+!MESSAGE NMAKE /f "mod_ssl.mak".
+!MESSAGE 
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "mod_ssl.mak" CFG="mod_ssl - Win32 Release"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "mod_ssl - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "mod_ssl - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MD /W3 /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /FD /c
+# ADD CPP /nologo /MD /W3 /O2 /Oy- /Zi /I "../../include" /I "../generators" /I "../../srclib/apr/include" /I "../../srclib/apr-util/include" /I "../../srclib/openssl/inc32" /I "../md" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "WIN32_LEAN_AND_MEAN" /D "NO_IDEA" /D "NO_RC5" /D "NO_MDC2" /D "OPENSSL_NO_IDEA" /D "OPENSSL_NO_RC5" /D "OPENSSL_NO_MDC2" /D "HAVE_OPENSSL" /D "HAVE_SSL_SET_STATE" /D "HAVE_OPENSSL_ENGINE_H" /D "HAVE_ENGINE_INIT" /D "HAVE_ENGINE_LOAD_BUILTIN_ENGINES" /D "SSL_DECLARE_EXPORT" /Fd"Release\mod_ssl_src" /FD /c
+# ADD BASE MTL /nologo /D "NDEBUG" /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /fo"Release/mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /d "NDEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib /nologo /subsystem:windows /dll /out:".\Release\mod_ssl.so" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so
+# ADD LINK32 kernel32.lib user32.lib wsock32.lib ws2_32.lib advapi32.lib gdi32.lib libeay32.lib ssleay32.lib /nologo /subsystem:windows /dll /incremental:no /debug /out:".\Release\mod_ssl.so" /libpath:"../../srclib/openssl/out32dll" /libpath:"../../srclib/openssl/out32" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so /opt:ref
+# Begin Special Build Tool
+TargetPath=.\Release\mod_ssl.so
+SOURCE="$(InputPath)"
+PostBuild_Desc=Embed .manifest
+PostBuild_Cmds=if exist $(TargetPath).manifest mt.exe -manifest $(TargetPath).manifest -outputresource:$(TargetPath);2
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /MDd /W3 /EHsc /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /FD /c
+# ADD CPP /nologo /MDd /W3 /EHsc /Zi /Od /I "../../include" /I "../generators" /I "../../srclib/apr/include" /I "../../srclib/apr-util/include" /I "../../srclib/openssl/inc32" /I "../md" /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "WIN32_LEAN_AND_MEAN" /D "NO_IDEA" /D "NO_RC5" /D "NO_MDC2" /D "OPENSSL_NO_IDEA" /D "OPENSSL_NO_RC5" /D "OPENSSL_NO_MDC2" /D "HAVE_OPENSSL" /D "HAVE_SSL_SET_STATE" /D "HAVE_OPENSSL_ENGINE_H" /D "HAVE_ENGINE_INIT" /D "HAVE_ENGINE_LOAD_BUILTIN_ENGINES" /D "SSL_DECLARE_EXPORT" /Fd"Debug\mod_ssl_src" /FD /c
+# ADD BASE MTL /nologo /D "_DEBUG" /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /fo"Debug/mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /d "_DEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib /nologo /subsystem:windows /dll /incremental:no /debug /out:".\Debug\mod_ssl.so" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so
+# ADD LINK32 kernel32.lib user32.lib wsock32.lib ws2_32.lib advapi32.lib gdi32.lib libeay32.lib ssleay32.lib /nologo /subsystem:windows /dll /incremental:no /debug /out:".\Debug\mod_ssl.so" /libpath:"../../srclib/openssl/out32dll.dbg" /libpath:"../../srclib/openssl/out32.dbg" /libpath:"../../srclib/openssl/out32dll" /libpath:"../../srclib/openssl/out32" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so
+# Begin Special Build Tool
+TargetPath=.\Debug\mod_ssl.so
+SOURCE="$(InputPath)"
+PostBuild_Desc=Embed .manifest
+PostBuild_Cmds=if exist $(TargetPath).manifest mt.exe -manifest $(TargetPath).manifest -outputresource:$(TargetPath);2
+# End Special Build Tool
+
+!ENDIF 
+
+# Begin Target
+
+# Name "mod_ssl - Win32 Release"
+# Name "mod_ssl - Win32 Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "*.c"
+# Begin Source File
+
+SOURCE=.\mod_ssl.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_config.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_init.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_io.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_kernel.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_log.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_mutex.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_pphrase.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_rand.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_vars.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_engine_ocsp.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util_ocsp.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_scache.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util_stapling.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util_ssl.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "*.h"
+# Begin Source File
+
+SOURCE=.\mod_ssl.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_private.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util_ssl.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\ssl_util_table.h
+# End Source File
+# End Group
+# Begin Source File
+
+SOURCE=..\..\build\win32\httpd.rc
+# End Source File
+# End Target
+# End Project
diff --git a/modules/ssl/mod_ssl.h b/modules/ssl/mod_ssl.h
new file mode 100644
index 0000000..a360911
--- /dev/null
+++ b/modules/ssl/mod_ssl.h
@@ -0,0 +1,120 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file mod_ssl.h
+ * @brief SSL extension module for Apache
+ *
+ * @defgroup MOD_SSL mod_ssl
+ * @ingroup  APACHE_MODS
+ * @{
+ */
+
+#ifndef __MOD_SSL_H__
+#define __MOD_SSL_H__
+
+#include "httpd.h"
+#include "http_config.h"
+#include "apr_optional.h"
+#include "apr_tables.h" /* for apr_array_header_t */
+
+/* Create a set of SSL_DECLARE(type), SSL_DECLARE_NONSTD(type) and
+ * SSL_DECLARE_DATA with appropriate export and import tags for the platform
+ */
+#if !defined(WIN32)
+#define SSL_DECLARE(type)            type
+#define SSL_DECLARE_NONSTD(type)     type
+#define SSL_DECLARE_DATA
+#elif defined(SSL_DECLARE_STATIC)
+#define SSL_DECLARE(type)            type __stdcall
+#define SSL_DECLARE_NONSTD(type)     type
+#define SSL_DECLARE_DATA
+#elif defined(SSL_DECLARE_EXPORT)
+#define SSL_DECLARE(type)            __declspec(dllexport) type __stdcall
+#define SSL_DECLARE_NONSTD(type)     __declspec(dllexport) type
+#define SSL_DECLARE_DATA             __declspec(dllexport)
+#else
+#define SSL_DECLARE(type)            __declspec(dllimport) type __stdcall
+#define SSL_DECLARE_NONSTD(type)     __declspec(dllimport) type
+#define SSL_DECLARE_DATA             __declspec(dllimport)
+#endif
+
+/** The ssl_var_lookup() optional function retrieves SSL environment
+ * variables. */
+APR_DECLARE_OPTIONAL_FN(char *, ssl_var_lookup,
+                        (apr_pool_t *, server_rec *,
+                         conn_rec *, request_rec *,
+                         char *));
+
+/** The ssl_ext_list() optional function attempts to build an array
+ * of all the values contained in the named X.509 extension. The
+ * returned array will be created in the supplied pool.
+ * The client certificate is used if peer is non-zero; the server
+ * certificate is used otherwise.
+ * Extension specifies the extensions to use as a string. This can be
+ * one of the "known" long or short names, or a numeric OID,
+ * e.g. "1.2.3.4", 'nsComment' and 'DN' are all valid.
+ * A pointer to an apr_array_header_t structure is returned if at
+ * least one matching extension is found, NULL otherwise.
+ */
+APR_DECLARE_OPTIONAL_FN(apr_array_header_t *, ssl_ext_list,
+                        (apr_pool_t *p, conn_rec *c, int peer,
+                         const char *extension));
+
+/** An optional function which returns non-zero if the given connection
+ * is using SSL/TLS. */
+APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
+
+/** The ssl_proxy_enable() and ssl_engine_{set,disable}() optional
+ * functions are used by mod_proxy to enable use of SSL for outgoing
+ * connections. */
+
+APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_enable, (conn_rec *));
+APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
+APR_DECLARE_OPTIONAL_FN(int, ssl_engine_set, (conn_rec *,
+                                              ap_conf_vector_t *,
+                                              int proxy, int enable));
+                                              
+/* Check for availability of new hooks */
+#define SSL_CERT_HOOKS
+#ifdef SSL_CERT_HOOKS
+
+/** Lets others add certificate and key files to the given server.
+ * For each cert a key must also be added.
+ * @param cert_file and array of const char* with the path to the certificate chain
+ * @param key_file and array of const char* with the path to the private key file
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, add_cert_files,
+                          (server_rec *s, apr_pool_t *p, 
+                           apr_array_header_t *cert_files,
+                           apr_array_header_t *key_files))
+
+/** In case no certificates are available for a server, this
+ * lets other modules add a fallback certificate for the time
+ * being. Regular requests against this server will be answered
+ * with a 503. 
+ * @param cert_file and array of const char* with the path to the certificate chain
+ * @param key_file and array of const char* with the path to the private key file
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, add_fallback_cert_files,
+                          (server_rec *s, apr_pool_t *p, 
+                           apr_array_header_t *cert_files,
+                           apr_array_header_t *key_files))
+
+#endif /* SSL_CERT_HOOKS */
+
+#endif /* __MOD_SSL_H__ */
+/** @} */
diff --git a/modules/ssl/mod_ssl.mak b/modules/ssl/mod_ssl.mak
new file mode 100644
index 0000000..ea77195
--- /dev/null
+++ b/modules/ssl/mod_ssl.mak
@@ -0,0 +1,500 @@
+# Microsoft Developer Studio Generated NMAKE File, Based on mod_ssl.dsp
+!IF "$(CFG)" == ""
+CFG=mod_ssl - Win32 Release
+!MESSAGE No configuration specified. Defaulting to mod_ssl - Win32 Release.
+!ENDIF 
+
+!IF "$(CFG)" != "mod_ssl - Win32 Release" && "$(CFG)" != "mod_ssl - Win32 Debug"
+!MESSAGE Invalid configuration "$(CFG)" specified.
+!MESSAGE You can specify a configuration when running NMAKE
+!MESSAGE by defining the macro CFG on the command line. For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "mod_ssl.mak" CFG="mod_ssl - Win32 Release"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "mod_ssl - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "mod_ssl - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE 
+!ERROR An invalid configuration is specified.
+!ENDIF 
+
+!IF "$(OS)" == "Windows_NT"
+NULL=
+!ELSE 
+NULL=nul
+!ENDIF 
+
+!IF "$(_HAVE_OSSL110)" == "1"
+SSLCRP=libcrypto
+SSLLIB=libssl
+SSLINC=/I ../../srclib/openssl/include
+SSLBIN=../../srclib/openssl
+!ELSE 
+SSLCRP=libeay32
+SSLLIB=ssleay32
+SSLINC=/I ../../srclib/openssl/inc32
+SSLBIN=../../srclib/openssl/out32dll
+!ENDIF 
+
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+OUTDIR=.\Release
+INTDIR=.\Release
+DS_POSTBUILD_DEP=$(INTDIR)\postbld.dep
+# Begin Custom Macros
+OutDir=.\Release
+# End Custom Macros
+
+!IF "$(RECURSE)" == "0" 
+
+ALL : "$(OUTDIR)\mod_ssl.so" "$(DS_POSTBUILD_DEP)"
+
+!ELSE 
+
+ALL : "libhttpd - Win32 Release" "libaprutil - Win32 Release" "libapr - Win32 Release" "$(OUTDIR)\mod_ssl.so" "$(DS_POSTBUILD_DEP)"
+
+!ENDIF 
+
+!IF "$(RECURSE)" == "1" 
+CLEAN :"libapr - Win32 ReleaseCLEAN" "libaprutil - Win32 ReleaseCLEAN" "libhttpd - Win32 ReleaseCLEAN" 
+!ELSE 
+CLEAN :
+!ENDIF 
+	-@erase "$(INTDIR)\mod_ssl.obj"
+	-@erase "$(INTDIR)\mod_ssl.res"
+	-@erase "$(INTDIR)\mod_ssl_src.idb"
+	-@erase "$(INTDIR)\mod_ssl_src.pdb"
+	-@erase "$(INTDIR)\ssl_engine_config.obj"
+	-@erase "$(INTDIR)\ssl_engine_init.obj"
+	-@erase "$(INTDIR)\ssl_engine_io.obj"
+	-@erase "$(INTDIR)\ssl_engine_kernel.obj"
+	-@erase "$(INTDIR)\ssl_engine_log.obj"
+	-@erase "$(INTDIR)\ssl_engine_mutex.obj"
+	-@erase "$(INTDIR)\ssl_engine_ocsp.obj"
+	-@erase "$(INTDIR)\ssl_engine_pphrase.obj"
+	-@erase "$(INTDIR)\ssl_engine_rand.obj"
+	-@erase "$(INTDIR)\ssl_engine_vars.obj"
+	-@erase "$(INTDIR)\ssl_scache.obj"
+	-@erase "$(INTDIR)\ssl_util.obj"
+	-@erase "$(INTDIR)\ssl_util_ocsp.obj"
+	-@erase "$(INTDIR)\ssl_util_ssl.obj"
+	-@erase "$(INTDIR)\ssl_util_stapling.obj"
+	-@erase "$(OUTDIR)\mod_ssl.exp"
+	-@erase "$(OUTDIR)\mod_ssl.lib"
+	-@erase "$(OUTDIR)\mod_ssl.pdb"
+	-@erase "$(OUTDIR)\mod_ssl.so"
+
+"$(OUTDIR)" :
+    if not exist "$(OUTDIR)/$(NULL)" mkdir "$(OUTDIR)"
+
+CPP=cl.exe
+CPP_PROJ=/nologo /MD /W3 /Zi /O2 /Oy- /I "../../include" /I "../generators" /I "../../srclib/apr/include" /I "../../srclib/apr-util/include" /I "../md" $(SSLINC) /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "WIN32_LEAN_AND_MEAN" /D "NO_IDEA" /D "NO_RC5" /D "NO_MDC2" /D "OPENSSL_NO_IDEA" /D "OPENSSL_NO_RC5" /D "OPENSSL_NO_MDC2" /D "HAVE_OPENSSL" /D "HAVE_SSL_SET_STATE" /D "HAVE_OPENSSL_ENGINE_H" /D "HAVE_ENGINE_INIT" /D "HAVE_ENGINE_LOAD_BUILTIN_ENGINES" /D "SSL_DECLARE_EXPORT" /Fo"$(INTDIR)\\" /Fd"$(INTDIR)\mod_ssl_src" /FD /c 
+
+.c{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cpp{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cxx{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.c{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cpp{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cxx{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+MTL=midl.exe
+MTL_PROJ=/nologo /D "NDEBUG" /mktyplib203 /win32 
+RSC=rc.exe
+RSC_PROJ=/l 0x409 /fo"$(INTDIR)\mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /d "NDEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache" 
+BSC32=bscmake.exe
+BSC32_FLAGS=/nologo /o"$(OUTDIR)\mod_ssl.bsc" 
+BSC32_SBRS= \
+	
+LINK32=link.exe
+LINK32_FLAGS=kernel32.lib user32.lib wsock32.lib ws2_32.lib advapi32.lib gdi32.lib $(SSLCRP).lib $(SSLLIB).lib /nologo /subsystem:windows /dll /incremental:no /pdb:"$(OUTDIR)\mod_ssl.pdb" /debug /out:"$(OUTDIR)\mod_ssl.so" /implib:"$(OUTDIR)\mod_ssl.lib" /libpath:"$(SSLBIN)" /libpath:"../../srclib/openssl/out32" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so /opt:ref 
+LINK32_OBJS= \
+	"$(INTDIR)\mod_ssl.obj" \
+	"$(INTDIR)\ssl_engine_config.obj" \
+	"$(INTDIR)\ssl_engine_init.obj" \
+	"$(INTDIR)\ssl_engine_io.obj" \
+	"$(INTDIR)\ssl_engine_kernel.obj" \
+	"$(INTDIR)\ssl_engine_log.obj" \
+	"$(INTDIR)\ssl_engine_mutex.obj" \
+	"$(INTDIR)\ssl_engine_pphrase.obj" \
+	"$(INTDIR)\ssl_engine_rand.obj" \
+	"$(INTDIR)\ssl_engine_vars.obj" \
+	"$(INTDIR)\ssl_engine_ocsp.obj" \
+	"$(INTDIR)\ssl_util_ocsp.obj" \
+	"$(INTDIR)\ssl_scache.obj" \
+	"$(INTDIR)\ssl_util_stapling.obj" \
+	"$(INTDIR)\ssl_util.obj" \
+	"$(INTDIR)\ssl_util_ssl.obj" \
+	"$(INTDIR)\mod_ssl.res" \
+	"..\..\srclib\apr\Release\libapr-1.lib" \
+	"..\..\srclib\apr-util\Release\libaprutil-1.lib" \
+	"..\..\Release\libhttpd.lib"
+
+"$(OUTDIR)\mod_ssl.so" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
+    $(LINK32) @<<
+  $(LINK32_FLAGS) $(LINK32_OBJS)
+<<
+
+TargetPath=.\Release\mod_ssl.so
+SOURCE="$(InputPath)"
+PostBuild_Desc=Embed .manifest
+DS_POSTBUILD_DEP=$(INTDIR)\postbld.dep
+
+# Begin Custom Macros
+OutDir=.\Release
+# End Custom Macros
+
+"$(DS_POSTBUILD_DEP)" : "$(OUTDIR)\mod_ssl.so"
+   if exist .\Release\mod_ssl.so.manifest mt.exe -manifest .\Release\mod_ssl.so.manifest -outputresource:.\Release\mod_ssl.so;2
+	echo Helper for Post-build step > "$(DS_POSTBUILD_DEP)"
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+OUTDIR=.\Debug
+INTDIR=.\Debug
+DS_POSTBUILD_DEP=$(INTDIR)\postbld.dep
+# Begin Custom Macros
+OutDir=.\Debug
+# End Custom Macros
+
+!IF "$(RECURSE)" == "0" 
+
+ALL : "$(OUTDIR)\mod_ssl.so" "$(DS_POSTBUILD_DEP)"
+
+!ELSE 
+
+ALL : "libhttpd - Win32 Debug" "libaprutil - Win32 Debug" "libapr - Win32 Debug" "$(OUTDIR)\mod_ssl.so" "$(DS_POSTBUILD_DEP)"
+
+!ENDIF 
+
+!IF "$(RECURSE)" == "1" 
+CLEAN :"libapr - Win32 DebugCLEAN" "libaprutil - Win32 DebugCLEAN" "libhttpd - Win32 DebugCLEAN" 
+!ELSE 
+CLEAN :
+!ENDIF 
+	-@erase "$(INTDIR)\mod_ssl.obj"
+	-@erase "$(INTDIR)\mod_ssl.res"
+	-@erase "$(INTDIR)\mod_ssl_src.idb"
+	-@erase "$(INTDIR)\mod_ssl_src.pdb"
+	-@erase "$(INTDIR)\ssl_engine_config.obj"
+	-@erase "$(INTDIR)\ssl_engine_init.obj"
+	-@erase "$(INTDIR)\ssl_engine_io.obj"
+	-@erase "$(INTDIR)\ssl_engine_kernel.obj"
+	-@erase "$(INTDIR)\ssl_engine_log.obj"
+	-@erase "$(INTDIR)\ssl_engine_mutex.obj"
+	-@erase "$(INTDIR)\ssl_engine_ocsp.obj"
+	-@erase "$(INTDIR)\ssl_engine_pphrase.obj"
+	-@erase "$(INTDIR)\ssl_engine_rand.obj"
+	-@erase "$(INTDIR)\ssl_engine_vars.obj"
+	-@erase "$(INTDIR)\ssl_scache.obj"
+	-@erase "$(INTDIR)\ssl_util.obj"
+	-@erase "$(INTDIR)\ssl_util_ocsp.obj"
+	-@erase "$(INTDIR)\ssl_util_ssl.obj"
+	-@erase "$(INTDIR)\ssl_util_stapling.obj"
+	-@erase "$(OUTDIR)\mod_ssl.exp"
+	-@erase "$(OUTDIR)\mod_ssl.lib"
+	-@erase "$(OUTDIR)\mod_ssl.pdb"
+	-@erase "$(OUTDIR)\mod_ssl.so"
+
+"$(OUTDIR)" :
+    if not exist "$(OUTDIR)/$(NULL)" mkdir "$(OUTDIR)"
+
+CPP=cl.exe
+CPP_PROJ=/nologo /MDd /W3 /Zi /Od /I "../../include" /I "../generators" /I "../../srclib/apr/include" /I "../../srclib/apr-util/include" /I "../md" $(SSLINC) /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "WIN32_LEAN_AND_MEAN" /D "NO_IDEA" /D "NO_RC5" /D "NO_MDC2" /D "OPENSSL_NO_IDEA" /D "OPENSSL_NO_RC5" /D "OPENSSL_NO_MDC2" /D "HAVE_OPENSSL" /D "HAVE_SSL_SET_STATE" /D "HAVE_OPENSSL_ENGINE_H" /D "HAVE_ENGINE_INIT" /D "HAVE_ENGINE_LOAD_BUILTIN_ENGINES" /D "SSL_DECLARE_EXPORT" /Fo"$(INTDIR)\\" /Fd"$(INTDIR)\mod_ssl_src" /FD /EHsc /c 
+
+.c{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cpp{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cxx{$(INTDIR)}.obj::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.c{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cpp{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+.cxx{$(INTDIR)}.sbr::
+   $(CPP) @<<
+   $(CPP_PROJ) $< 
+<<
+
+MTL=midl.exe
+MTL_PROJ=/nologo /D "_DEBUG" /mktyplib203 /win32 
+RSC=rc.exe
+RSC_PROJ=/l 0x409 /fo"$(INTDIR)\mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /d "_DEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache" 
+BSC32=bscmake.exe
+BSC32_FLAGS=/nologo /o"$(OUTDIR)\mod_ssl.bsc" 
+BSC32_SBRS= \
+	
+LINK32=link.exe
+LINK32_FLAGS=kernel32.lib user32.lib wsock32.lib ws2_32.lib advapi32.lib gdi32.lib $(SSLCRP).lib $(SSLLIB).lib /nologo /subsystem:windows /dll /incremental:no /pdb:"$(OUTDIR)\mod_ssl.pdb" /debug /out:"$(OUTDIR)\mod_ssl.so" /implib:"$(OUTDIR)\mod_ssl.lib" /libpath:"../../srclib/openssl/out32dll.dbg" /libpath:"../../srclib/openssl/out32.dbg" /libpath:"$(SSLBIN)" /libpath:"../../srclib/openssl/out32" /base:@..\..\os\win32\BaseAddr.ref,mod_ssl.so 
+LINK32_OBJS= \
+	"$(INTDIR)\mod_ssl.obj" \
+	"$(INTDIR)\ssl_engine_config.obj" \
+	"$(INTDIR)\ssl_engine_init.obj" \
+	"$(INTDIR)\ssl_engine_io.obj" \
+	"$(INTDIR)\ssl_engine_kernel.obj" \
+	"$(INTDIR)\ssl_engine_log.obj" \
+	"$(INTDIR)\ssl_engine_mutex.obj" \
+	"$(INTDIR)\ssl_engine_pphrase.obj" \
+	"$(INTDIR)\ssl_engine_rand.obj" \
+	"$(INTDIR)\ssl_engine_vars.obj" \
+	"$(INTDIR)\ssl_engine_ocsp.obj" \
+	"$(INTDIR)\ssl_util_ocsp.obj" \
+	"$(INTDIR)\ssl_scache.obj" \
+	"$(INTDIR)\ssl_util_stapling.obj" \
+	"$(INTDIR)\ssl_util.obj" \
+	"$(INTDIR)\ssl_util_ssl.obj" \
+	"$(INTDIR)\mod_ssl.res" \
+	"..\..\srclib\apr\Debug\libapr-1.lib" \
+	"..\..\srclib\apr-util\Debug\libaprutil-1.lib" \
+	"..\..\Debug\libhttpd.lib"
+
+"$(OUTDIR)\mod_ssl.so" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
+    $(LINK32) @<<
+  $(LINK32_FLAGS) $(LINK32_OBJS)
+<<
+
+TargetPath=.\Debug\mod_ssl.so
+SOURCE="$(InputPath)"
+PostBuild_Desc=Embed .manifest
+DS_POSTBUILD_DEP=$(INTDIR)\postbld.dep
+
+# Begin Custom Macros
+OutDir=.\Debug
+# End Custom Macros
+
+"$(DS_POSTBUILD_DEP)" : "$(OUTDIR)\mod_ssl.so"
+   if exist .\Debug\mod_ssl.so.manifest mt.exe -manifest .\Debug\mod_ssl.so.manifest -outputresource:.\Debug\mod_ssl.so;2
+	echo Helper for Post-build step > "$(DS_POSTBUILD_DEP)"
+
+!ENDIF 
+
+
+!IF "$(NO_EXTERNAL_DEPS)" != "1"
+!IF EXISTS("mod_ssl.dep")
+!INCLUDE "mod_ssl.dep"
+!ELSE 
+!MESSAGE Warning: cannot find "mod_ssl.dep"
+!ENDIF 
+!ENDIF 
+
+
+!IF "$(CFG)" == "mod_ssl - Win32 Release" || "$(CFG)" == "mod_ssl - Win32 Debug"
+SOURCE=.\mod_ssl.c
+
+"$(INTDIR)\mod_ssl.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_config.c
+
+"$(INTDIR)\ssl_engine_config.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_init.c
+
+"$(INTDIR)\ssl_engine_init.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_io.c
+
+"$(INTDIR)\ssl_engine_io.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_kernel.c
+
+"$(INTDIR)\ssl_engine_kernel.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_log.c
+
+"$(INTDIR)\ssl_engine_log.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_mutex.c
+
+"$(INTDIR)\ssl_engine_mutex.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_ocsp.c
+
+"$(INTDIR)\ssl_engine_ocsp.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_pphrase.c
+
+"$(INTDIR)\ssl_engine_pphrase.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_rand.c
+
+"$(INTDIR)\ssl_engine_rand.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_engine_vars.c
+
+"$(INTDIR)\ssl_engine_vars.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_scache.c
+
+"$(INTDIR)\ssl_scache.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_util.c
+
+"$(INTDIR)\ssl_util.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_util_ocsp.c
+
+"$(INTDIR)\ssl_util_ocsp.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_util_ssl.c
+
+"$(INTDIR)\ssl_util_ssl.obj" : $(SOURCE) "$(INTDIR)"
+
+
+SOURCE=.\ssl_util_stapling.c
+
+"$(INTDIR)\ssl_util_stapling.obj" : $(SOURCE) "$(INTDIR)"
+
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+"libapr - Win32 Release" : 
+   cd ".\..\..\srclib\apr"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libapr.mak" CFG="libapr - Win32 Release" 
+   cd "..\..\modules\ssl"
+
+"libapr - Win32 ReleaseCLEAN" : 
+   cd ".\..\..\srclib\apr"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libapr.mak" CFG="libapr - Win32 Release" RECURSE=1 CLEAN 
+   cd "..\..\modules\ssl"
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+"libapr - Win32 Debug" : 
+   cd ".\..\..\srclib\apr"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libapr.mak" CFG="libapr - Win32 Debug" 
+   cd "..\..\modules\ssl"
+
+"libapr - Win32 DebugCLEAN" : 
+   cd ".\..\..\srclib\apr"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libapr.mak" CFG="libapr - Win32 Debug" RECURSE=1 CLEAN 
+   cd "..\..\modules\ssl"
+
+!ENDIF 
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+"libaprutil - Win32 Release" : 
+   cd ".\..\..\srclib\apr-util"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libaprutil.mak" CFG="libaprutil - Win32 Release" 
+   cd "..\..\modules\ssl"
+
+"libaprutil - Win32 ReleaseCLEAN" : 
+   cd ".\..\..\srclib\apr-util"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libaprutil.mak" CFG="libaprutil - Win32 Release" RECURSE=1 CLEAN 
+   cd "..\..\modules\ssl"
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+"libaprutil - Win32 Debug" : 
+   cd ".\..\..\srclib\apr-util"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libaprutil.mak" CFG="libaprutil - Win32 Debug" 
+   cd "..\..\modules\ssl"
+
+"libaprutil - Win32 DebugCLEAN" : 
+   cd ".\..\..\srclib\apr-util"
+   $(MAKE) /$(MAKEFLAGS) /F ".\libaprutil.mak" CFG="libaprutil - Win32 Debug" RECURSE=1 CLEAN 
+   cd "..\..\modules\ssl"
+
+!ENDIF 
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+"libhttpd - Win32 Release" : 
+   cd ".\..\.."
+   $(MAKE) /$(MAKEFLAGS) /F ".\libhttpd.mak" CFG="libhttpd - Win32 Release" 
+   cd ".\modules\ssl"
+
+"libhttpd - Win32 ReleaseCLEAN" : 
+   cd ".\..\.."
+   $(MAKE) /$(MAKEFLAGS) /F ".\libhttpd.mak" CFG="libhttpd - Win32 Release" RECURSE=1 CLEAN 
+   cd ".\modules\ssl"
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+"libhttpd - Win32 Debug" : 
+   cd ".\..\.."
+   $(MAKE) /$(MAKEFLAGS) /F ".\libhttpd.mak" CFG="libhttpd - Win32 Debug" 
+   cd ".\modules\ssl"
+
+"libhttpd - Win32 DebugCLEAN" : 
+   cd ".\..\.."
+   $(MAKE) /$(MAKEFLAGS) /F ".\libhttpd.mak" CFG="libhttpd - Win32 Debug" RECURSE=1 CLEAN 
+   cd ".\modules\ssl"
+
+!ENDIF 
+
+SOURCE=..\..\build\win32\httpd.rc
+
+!IF  "$(CFG)" == "mod_ssl - Win32 Release"
+
+
+"$(INTDIR)\mod_ssl.res" : $(SOURCE) "$(INTDIR)"
+	$(RSC) /l 0x409 /fo"$(INTDIR)\mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /i "../../build\win32" /d "NDEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache" $(SOURCE)
+
+
+!ELSEIF  "$(CFG)" == "mod_ssl - Win32 Debug"
+
+
+"$(INTDIR)\mod_ssl.res" : $(SOURCE) "$(INTDIR)"
+	$(RSC) /l 0x409 /fo"$(INTDIR)\mod_ssl.res" /i "../../include" /i "../../srclib/apr/include" /i "../../build\win32" /d "_DEBUG" /d BIN_NAME="mod_ssl.so" /d LONG_NAME="proxy_ssl_module for Apache" $(SOURCE)
+
+
+!ENDIF 
+
+
+!ENDIF 
+
diff --git a/modules/ssl/mod_ssl_openssl.h b/modules/ssl/mod_ssl_openssl.h
new file mode 100644
index 0000000..d4f684f
--- /dev/null
+++ b/modules/ssl/mod_ssl_openssl.h
@@ -0,0 +1,113 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file mod_ssl_openssl.h
+ * @brief Interface to OpenSSL-specific APIs provided by mod_ssl
+ *
+ * @defgroup MOD_SSL mod_ssl_openssl
+ * @ingroup  APACHE_MODS
+ * @{
+ */
+
+#ifndef __MOD_SSL_OPENSSL_H__
+#define __MOD_SSL_OPENSSL_H__
+
+#include "mod_ssl.h"
+
+/* OpenSSL headers */
+
+#ifndef SSL_PRIVATE_H
+#include <openssl/opensslv.h>
+#if (OPENSSL_VERSION_NUMBER >= 0x10001000)
+/* must be defined before including ssl.h */
+#define OPENSSL_NO_SSL_INTERN
+#endif
+#include <openssl/ssl.h>
+#endif
+
+/**
+ * init_server hook -- allow SSL_CTX-specific initialization to be performed by
+ * a module for each SSL-enabled server (one at a time)
+ * @param s SSL-enabled [virtual] server
+ * @param p pconf pool
+ * @param is_proxy 1 if this server supports backend connections
+ * over SSL/TLS, 0 if it supports client connections over SSL/TLS
+ * @param ctx OpenSSL SSL Context for the server
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, init_server,
+                          (server_rec *s, apr_pool_t *p, int is_proxy, SSL_CTX *ctx))
+
+/**
+ * pre_handshake hook
+ * @param c conn_rec for new connection from client or to backend server
+ * @param ssl OpenSSL SSL Connection for the client or backend server
+ * @param is_proxy 1 if this handshake is for a backend connection, 0 otherwise
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, pre_handshake,
+                          (conn_rec *c, SSL *ssl, int is_proxy))
+
+/**
+ * proxy_post_handshake hook -- allow module to abort after successful
+ * handshake with backend server and subsequent peer checks
+ * @param c conn_rec for connection to backend server
+ * @param ssl OpenSSL SSL Connection for the client or backend server
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, proxy_post_handshake,
+                          (conn_rec *c, SSL *ssl))
+
+/** On TLS connections that do not relate to a configured virtual host,
+ * allow other modules to provide a X509 certificate and EVP_PKEY to
+ * be used on the connection. This first hook which does not
+ * return DECLINED will determine the outcome. */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, answer_challenge,
+                          (conn_rec *c, const char *server_name, 
+                          X509 **pcert, EVP_PKEY **pkey))
+
+/** During post_config phase, ask around if someone wants to provide
+ * OCSP stapling status information for the given cert (with the also
+ * provided issuer certificate). The first hook which does not
+ * return DECLINED promises to take responsibility (and respond
+ * in later calls via hook ssl_get_stapling_status).
+ * If no hook takes over, mod_ssl's own stapling implementation will
+ * be applied (if configured).
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, init_stapling_status,
+                          (server_rec *s, apr_pool_t *p, 
+                          X509 *cert, X509 *issuer))
+
+/** Anyone answering positive to ssl_init_stapling_status for a 
+ * certificate, needs to register here and supply the actual OCSP stapling
+ * status data (OCSP_RESP) for a new connection.
+ * A hook supplying the response data must return APR_SUCCESS.
+ * The data is returned in DER encoded bytes via pder and pderlen. The
+ * returned pointer may be NULL, which indicates that data is (currently)
+ * unavailable.
+ * If DER data is returned, it MUST come from a response with
+ * status OCSP_RESPONSE_STATUS_SUCCESSFUL and V_OCSP_CERTSTATUS_GOOD
+ * or V_OCSP_CERTSTATUS_REVOKED, not V_OCSP_CERTSTATUS_UNKNOWN. This means
+ * errors in OCSP retrieval are to be handled/logged by the hook and
+ * are not done by mod_ssl.
+ * Any DER bytes returned MUST be allocated via malloc() and ownership
+ * passes to mod_ssl. Meaning, the hook must return a malloced copy of
+ * the data it has. mod_ssl (or OpenSSL) will free it. 
+ */
+APR_DECLARE_EXTERNAL_HOOK(ssl, SSL, int, get_stapling_status,
+                          (unsigned char **pder, int *pderlen, 
+                          conn_rec *c, server_rec *s, X509 *cert))
+                          
+#endif /* __MOD_SSL_OPENSSL_H__ */
+/** @} */
diff --git a/modules/ssl/ssl_engine_config.c b/modules/ssl/ssl_engine_config.c
new file mode 100644
index 0000000..de18b8f
--- /dev/null
+++ b/modules/ssl/ssl_engine_config.c
@@ -0,0 +1,2158 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_config.c
+ *  Apache Configuration Directives
+ */
+                                      /* ``Damned if you do,
+                                           damned if you don't.''
+                                               -- Unknown        */
+#include "ssl_private.h"
+#include "util_mutex.h"
+#include "ap_provider.h"
+
+/*  _________________________________________________________________
+**
+**  Support for Global Configuration
+**  _________________________________________________________________
+*/
+
+#define SSL_MOD_CONFIG_KEY "ssl_module"
+
+SSLModConfigRec *ssl_config_global_create(server_rec *s)
+{
+    apr_pool_t *pool = s->process->pool;
+    SSLModConfigRec *mc;
+    void *vmc;
+
+    apr_pool_userdata_get(&vmc, SSL_MOD_CONFIG_KEY, pool);
+    if (vmc) {
+        return vmc; /* reused for lifetime of the server */
+    }
+
+    /*
+     * allocate an own subpool which survives server restarts
+     */
+    mc = (SSLModConfigRec *)apr_palloc(pool, sizeof(*mc));
+    mc->pPool = pool;
+    mc->bFixed = FALSE;
+
+    /*
+     * initialize per-module configuration
+     */
+    mc->sesscache_mode         = SSL_SESS_CACHE_OFF;
+    mc->sesscache              = NULL;
+    mc->pMutex                 = NULL;
+    mc->aRandSeed              = apr_array_make(pool, 4,
+                                                sizeof(ssl_randseed_t));
+    mc->tVHostKeys             = apr_hash_make(pool);
+    mc->tPrivateKey            = apr_hash_make(pool);
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    mc->szCryptoDevice         = NULL;
+#endif
+#ifdef HAVE_OCSP_STAPLING
+    mc->stapling_cache         = NULL;
+    mc->stapling_cache_mutex   = NULL;
+    mc->stapling_refresh_mutex = NULL;
+#endif
+
+#ifdef HAVE_OPENSSL_KEYLOG
+    mc->keylog_file = NULL;
+#endif
+#ifdef HAVE_FIPS
+    mc->fips = UNSET;
+#endif
+
+    apr_pool_userdata_set(mc, SSL_MOD_CONFIG_KEY,
+                          apr_pool_cleanup_null,
+                          pool);
+
+    return mc;
+}
+
+void ssl_config_global_fix(SSLModConfigRec *mc)
+{
+    mc->bFixed = TRUE;
+}
+
+BOOL ssl_config_global_isfixed(SSLModConfigRec *mc)
+{
+    return mc->bFixed;
+}
+
+/*  _________________________________________________________________
+**
+**  Configuration handling
+**  _________________________________________________________________
+*/
+
+#ifdef HAVE_SSL_CONF_CMD
+static apr_status_t modssl_ctx_config_cleanup(void *ctx)
+{
+    SSL_CONF_CTX_free(ctx);
+    return APR_SUCCESS;
+}
+#endif
+
+static void modssl_ctx_init(modssl_ctx_t *mctx, apr_pool_t *p)
+{
+    mctx->sc                  = NULL; /* set during module init */
+
+    mctx->ssl_ctx             = NULL; /* set during module init */
+
+    mctx->pks                 = NULL;
+    mctx->pkp                 = NULL;
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    mctx->ticket_key          = NULL;
+#endif
+
+    mctx->protocol            = SSL_PROTOCOL_DEFAULT;
+    mctx->protocol_set        = 0;
+
+    mctx->pphrase_dialog_type = SSL_PPTYPE_UNSET;
+    mctx->pphrase_dialog_path = NULL;
+
+    mctx->cert_chain          = NULL;
+
+    mctx->crl_path            = NULL;
+    mctx->crl_file            = NULL;
+    mctx->crl_check_mask      = UNSET;
+
+    mctx->auth.ca_cert_path   = NULL;
+    mctx->auth.ca_cert_file   = NULL;
+    mctx->auth.cipher_suite   = NULL;
+    mctx->auth.verify_depth   = UNSET;
+    mctx->auth.verify_mode    = SSL_CVERIFY_UNSET;
+    mctx->auth.tls13_ciphers = NULL;
+
+    mctx->ocsp_mask           = UNSET;
+    mctx->ocsp_force_default  = UNSET;
+    mctx->ocsp_responder      = NULL;
+    mctx->ocsp_resptime_skew  = UNSET;
+    mctx->ocsp_resp_maxage    = UNSET;
+    mctx->ocsp_responder_timeout = UNSET;
+    mctx->ocsp_use_request_nonce = UNSET;
+    mctx->proxy_uri              = NULL;
+
+/* Set OCSP Responder Certificate Verification variable */
+    mctx->ocsp_noverify       = UNSET;
+/* Set OCSP Responder File variables */
+    mctx->ocsp_verify_flags   = 0;
+    mctx->ocsp_certs_file     = NULL;
+    mctx->ocsp_certs          = NULL;
+
+#ifdef HAVE_OCSP_STAPLING
+    mctx->stapling_enabled           = UNSET;
+    mctx->stapling_resptime_skew     = UNSET;
+    mctx->stapling_resp_maxage       = UNSET;
+    mctx->stapling_cache_timeout     = UNSET;
+    mctx->stapling_return_errors     = UNSET;
+    mctx->stapling_fake_trylater     = UNSET;
+    mctx->stapling_errcache_timeout  = UNSET;
+    mctx->stapling_responder_timeout = UNSET;
+    mctx->stapling_force_url         = NULL;
+#endif
+
+#ifdef HAVE_SRP
+    mctx->srp_vfile =             NULL;
+    mctx->srp_unknown_user_seed = NULL;
+    mctx->srp_vbase =             NULL;
+#endif
+#ifdef HAVE_SSL_CONF_CMD
+    mctx->ssl_ctx_config = SSL_CONF_CTX_new();
+    apr_pool_cleanup_register(p, mctx->ssl_ctx_config,
+                              modssl_ctx_config_cleanup,
+                              apr_pool_cleanup_null);
+    SSL_CONF_CTX_set_flags(mctx->ssl_ctx_config, SSL_CONF_FLAG_FILE);
+    SSL_CONF_CTX_set_flags(mctx->ssl_ctx_config, SSL_CONF_FLAG_SERVER);
+    SSL_CONF_CTX_set_flags(mctx->ssl_ctx_config, SSL_CONF_FLAG_CERTIFICATE);
+    mctx->ssl_ctx_param = apr_array_make(p, 5, sizeof(ssl_ctx_param_t));
+#endif
+
+    mctx->ssl_check_peer_cn     = UNSET;
+    mctx->ssl_check_peer_name   = UNSET;
+    mctx->ssl_check_peer_expire = UNSET;
+}
+
+static void modssl_ctx_init_server(SSLSrvConfigRec *sc,
+                                   apr_pool_t *p)
+{
+    modssl_ctx_t *mctx;
+
+    mctx = sc->server = apr_palloc(p, sizeof(*sc->server));
+
+    modssl_ctx_init(mctx, p);
+
+    mctx->pks = apr_pcalloc(p, sizeof(*mctx->pks));
+
+    mctx->pks->cert_files = apr_array_make(p, 3, sizeof(char *));
+    mctx->pks->key_files  = apr_array_make(p, 3, sizeof(char *));
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    mctx->ticket_key = apr_pcalloc(p, sizeof(*mctx->ticket_key));
+#endif
+}
+
+static SSLSrvConfigRec *ssl_config_server_new(apr_pool_t *p)
+{
+    SSLSrvConfigRec *sc = apr_palloc(p, sizeof(*sc));
+
+    sc->mc                     = NULL;
+    sc->enabled                = SSL_ENABLED_UNSET;
+    sc->vhost_id               = NULL;  /* set during module init */
+    sc->vhost_id_len           = 0;     /* set during module init */
+    sc->session_cache_timeout  = UNSET;
+    sc->cipher_server_pref     = UNSET;
+    sc->insecure_reneg         = UNSET;
+#ifdef HAVE_TLSEXT
+    sc->strict_sni_vhost_check = SSL_ENABLED_UNSET;
+#endif
+#ifndef OPENSSL_NO_COMP
+    sc->compression            = UNSET;
+#endif
+    sc->session_tickets        = UNSET;
+
+    modssl_ctx_init_server(sc, p);
+
+    return sc;
+}
+
+/*
+ *  Create per-server SSL configuration
+ */
+void *ssl_config_server_create(apr_pool_t *p, server_rec *s)
+{
+    SSLSrvConfigRec *sc = ssl_config_server_new(p);
+
+    sc->mc = ssl_config_global_create(s);
+
+    return sc;
+}
+
+#define cfgMerge(el,unset)  mrg->el = (add->el == (unset)) ? base->el : add->el
+#define cfgMergeArray(el)   mrg->el = apr_array_append(p, base->el, add->el)
+#define cfgMergeString(el)  cfgMerge(el, NULL)
+#define cfgMergeBool(el)    cfgMerge(el, UNSET)
+#define cfgMergeInt(el)     cfgMerge(el, UNSET)
+
+/*
+ *  Merge per-server SSL configurations
+ */
+
+static void modssl_ctx_cfg_merge(apr_pool_t *p,
+                                 modssl_ctx_t *base,
+                                 modssl_ctx_t *add,
+                                 modssl_ctx_t *mrg)
+{
+    if (add->protocol_set) {
+        mrg->protocol_set = 1;
+        mrg->protocol = add->protocol;
+    }
+    else {
+        mrg->protocol_set = base->protocol_set;
+        mrg->protocol = base->protocol;
+    }
+
+    cfgMerge(pphrase_dialog_type, SSL_PPTYPE_UNSET);
+    cfgMergeString(pphrase_dialog_path);
+
+    cfgMergeString(cert_chain);
+
+    cfgMerge(crl_path, NULL);
+    cfgMerge(crl_file, NULL);
+    cfgMergeInt(crl_check_mask);
+
+    cfgMergeString(auth.ca_cert_path);
+    cfgMergeString(auth.ca_cert_file);
+    cfgMergeString(auth.cipher_suite);
+    cfgMergeInt(auth.verify_depth);
+    cfgMerge(auth.verify_mode, SSL_CVERIFY_UNSET);
+    cfgMergeString(auth.tls13_ciphers);
+
+    cfgMergeInt(ocsp_mask);
+    cfgMergeBool(ocsp_force_default);
+    cfgMerge(ocsp_responder, NULL);
+    cfgMergeInt(ocsp_resptime_skew);
+    cfgMergeInt(ocsp_resp_maxage);
+    cfgMergeInt(ocsp_responder_timeout);
+    cfgMergeBool(ocsp_use_request_nonce);
+    cfgMerge(proxy_uri, NULL);
+
+/* Set OCSP Responder Certificate Verification directive */
+    cfgMergeBool(ocsp_noverify);  
+/* Set OCSP Responder File directive for importing */
+    cfgMerge(ocsp_certs_file, NULL);
+
+#ifdef HAVE_OCSP_STAPLING
+    cfgMergeBool(stapling_enabled);
+    cfgMergeInt(stapling_resptime_skew);
+    cfgMergeInt(stapling_resp_maxage);
+    cfgMergeInt(stapling_cache_timeout);
+    cfgMergeBool(stapling_return_errors);
+    cfgMergeBool(stapling_fake_trylater);
+    cfgMergeInt(stapling_errcache_timeout);
+    cfgMergeInt(stapling_responder_timeout);
+    cfgMerge(stapling_force_url, NULL);
+#endif
+
+#ifdef HAVE_SRP
+    cfgMergeString(srp_vfile);
+    cfgMergeString(srp_unknown_user_seed);
+#endif
+
+#ifdef HAVE_SSL_CONF_CMD
+    cfgMergeArray(ssl_ctx_param);
+#endif
+
+    cfgMergeBool(ssl_check_peer_cn);
+    cfgMergeBool(ssl_check_peer_name);
+    cfgMergeBool(ssl_check_peer_expire);
+}
+
+static void modssl_ctx_cfg_merge_certkeys_array(apr_pool_t *p,
+                                                apr_array_header_t *base,
+                                                apr_array_header_t *add,
+                                                apr_array_header_t *mrg)
+{
+    int i;
+
+    /*
+     * pick up to CERTKEYS_IDX_MAX+1 entries from "add" (in which case they
+     * they "knock out" their corresponding entries in "base", emulating
+     * the behavior with cfgMergeString in releases up to 2.4.7)
+     */
+    for (i = 0; i < add->nelts && i <= CERTKEYS_IDX_MAX; i++) {
+        APR_ARRAY_PUSH(mrg, const char *) = APR_ARRAY_IDX(add, i, const char *);
+    }
+
+    /* add remaining ones from "base" */
+    while (i < base->nelts) {
+        APR_ARRAY_PUSH(mrg, const char *) = APR_ARRAY_IDX(base, i, const char *);
+        i++;
+    }
+
+    /* and finally, append the rest of "add" (if there are any) */
+    for (i = CERTKEYS_IDX_MAX+1; i < add->nelts; i++) {
+        APR_ARRAY_PUSH(mrg, const char *) = APR_ARRAY_IDX(add, i, const char *);
+    }
+}
+
+static void modssl_ctx_cfg_merge_server(apr_pool_t *p,
+                                        modssl_ctx_t *base,
+                                        modssl_ctx_t *add,
+                                        modssl_ctx_t *mrg)
+{
+    modssl_ctx_cfg_merge(p, base, add, mrg);
+
+    /*
+     * For better backwards compatibility with releases up to 2.4.7,
+     * merging global and vhost-level SSLCertificateFile and
+     * SSLCertificateKeyFile directives needs special treatment.
+     * See also PR 56306 and 56353.
+     */
+    modssl_ctx_cfg_merge_certkeys_array(p, base->pks->cert_files,
+                                        add->pks->cert_files,
+                                        mrg->pks->cert_files);
+    modssl_ctx_cfg_merge_certkeys_array(p, base->pks->key_files,
+                                        add->pks->key_files,
+                                        mrg->pks->key_files);
+
+    cfgMergeString(pks->ca_name_path);
+    cfgMergeString(pks->ca_name_file);
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    cfgMergeString(ticket_key->file_path);
+#endif
+}
+
+void *ssl_config_server_merge(apr_pool_t *p, void *basev, void *addv)
+{
+    SSLSrvConfigRec *base = (SSLSrvConfigRec *)basev;
+    SSLSrvConfigRec *add  = (SSLSrvConfigRec *)addv;
+    SSLSrvConfigRec *mrg  = ssl_config_server_new(p);
+
+    cfgMerge(mc, NULL);
+    cfgMerge(enabled, SSL_ENABLED_UNSET);
+    cfgMergeInt(session_cache_timeout);
+    cfgMergeBool(cipher_server_pref);
+    cfgMergeBool(insecure_reneg);
+#ifdef HAVE_TLSEXT
+    cfgMerge(strict_sni_vhost_check, SSL_ENABLED_UNSET);
+#endif
+#ifndef OPENSSL_NO_COMP
+    cfgMergeBool(compression);
+#endif
+    cfgMergeBool(session_tickets);
+
+    modssl_ctx_cfg_merge_server(p, base->server, add->server, mrg->server);
+
+    return mrg;
+}
+
+/*
+ *  Create per-directory SSL configuration
+ */
+
+static void modssl_ctx_init_proxy(SSLDirConfigRec *dc,
+                                  apr_pool_t *p)
+{
+    modssl_ctx_t *mctx;
+
+    mctx = dc->proxy = apr_palloc(p, sizeof(*dc->proxy));
+
+    modssl_ctx_init(mctx, p);
+
+    mctx->pkp = apr_palloc(p, sizeof(*mctx->pkp));
+
+    mctx->pkp->cert_file = NULL;
+    mctx->pkp->cert_path = NULL;
+    mctx->pkp->ca_cert_file = NULL;
+    mctx->pkp->certs     = NULL;
+    mctx->pkp->ca_certs  = NULL;
+}
+
+void *ssl_config_perdir_create(apr_pool_t *p, char *dir)
+{
+    SSLDirConfigRec *dc = apr_palloc(p, sizeof(*dc));
+
+    dc->bSSLRequired  = FALSE;
+    dc->aRequirement  = apr_array_make(p, 4, sizeof(ssl_require_t));
+    dc->nOptions      = SSL_OPT_NONE|SSL_OPT_RELSET;
+    dc->nOptionsAdd   = SSL_OPT_NONE;
+    dc->nOptionsDel   = SSL_OPT_NONE;
+
+    dc->szCipherSuite          = NULL;
+    dc->nVerifyClient          = SSL_CVERIFY_UNSET;
+    dc->nVerifyDepth           = UNSET;
+
+    dc->szUserName             = NULL;
+
+    dc->nRenegBufferSize = UNSET;
+
+    dc->proxy_enabled = UNSET;
+    modssl_ctx_init_proxy(dc, p);
+    dc->proxy_post_config = FALSE;
+
+    return dc;
+}
+
+/*
+ *  Merge per-directory SSL configurations
+ */
+
+static void modssl_ctx_cfg_merge_proxy(apr_pool_t *p,
+                                       modssl_ctx_t *base,
+                                       modssl_ctx_t *add,
+                                       modssl_ctx_t *mrg)
+{
+    modssl_ctx_cfg_merge(p, base, add, mrg);
+
+    cfgMergeString(pkp->cert_file);
+    cfgMergeString(pkp->cert_path);
+    cfgMergeString(pkp->ca_cert_file);
+    cfgMergeString(pkp->certs);
+    cfgMergeString(pkp->ca_certs);
+}
+
+void *ssl_config_perdir_merge(apr_pool_t *p, void *basev, void *addv)
+{
+    SSLDirConfigRec *base = (SSLDirConfigRec *)basev;
+    SSLDirConfigRec *add  = (SSLDirConfigRec *)addv;
+    SSLDirConfigRec *mrg  = (SSLDirConfigRec *)apr_palloc(p, sizeof(*mrg));
+
+    cfgMerge(bSSLRequired, FALSE);
+    cfgMergeArray(aRequirement);
+
+    if (add->nOptions & SSL_OPT_RELSET) {
+        mrg->nOptionsAdd =
+            (base->nOptionsAdd & ~(add->nOptionsDel)) | add->nOptionsAdd;
+        mrg->nOptionsDel =
+            (base->nOptionsDel & ~(add->nOptionsAdd)) | add->nOptionsDel;
+        mrg->nOptions    =
+            (base->nOptions    & ~(mrg->nOptionsDel)) | mrg->nOptionsAdd;
+    }
+    else {
+        mrg->nOptions    = add->nOptions;
+        mrg->nOptionsAdd = add->nOptionsAdd;
+        mrg->nOptionsDel = add->nOptionsDel;
+    }
+
+    cfgMergeString(szCipherSuite);
+    cfgMerge(nVerifyClient, SSL_CVERIFY_UNSET);
+    cfgMergeInt(nVerifyDepth);
+
+    cfgMergeString(szUserName);
+
+    cfgMergeInt(nRenegBufferSize);
+
+    mrg->proxy_post_config = add->proxy_post_config;
+    if (!mrg->proxy_post_config) {
+        cfgMergeBool(proxy_enabled);
+        modssl_ctx_init_proxy(mrg, p);
+        modssl_ctx_cfg_merge_proxy(p, base->proxy, add->proxy, mrg->proxy);
+
+        /* Since ssl_proxy_section_post_config() hook won't be called if there
+         * is no SSLProxy* in this dir config, the ssl_ctx may still be NULL
+         * here at runtime. Merging it is either a no-op (NULL => NULL) because
+         * we are still before post config, or we really want to reuse the one
+         * from the upper/server context (outside of <Proxy> sections).
+         */
+        cfgMerge(proxy->ssl_ctx, NULL);
+    }
+    else {
+        /* The post_config hook has already merged and initialized the
+         * proxy context, use it.
+         */
+        mrg->proxy_enabled = add->proxy_enabled;
+        mrg->proxy = add->proxy;
+    }
+
+    return mrg;
+}
+
+/* Simply merge conf with base into conf, no third party. */
+void ssl_config_proxy_merge(apr_pool_t *p,
+                            SSLDirConfigRec *base,
+                            SSLDirConfigRec *conf)
+{
+    if (conf->proxy_enabled == UNSET) {
+        conf->proxy_enabled = base->proxy_enabled;
+    }
+    modssl_ctx_cfg_merge_proxy(p, base->proxy, conf->proxy, conf->proxy);
+}
+
+/*
+ *  Configuration functions for particular directives
+ */
+
+const char *ssl_cmd_SSLPassPhraseDialog(cmd_parms *cmd,
+                                        void *dcfg,
+                                        const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+    int arglen = strlen(arg);
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+    if (strcEQ(arg, "builtin")) {
+        sc->server->pphrase_dialog_type  = SSL_PPTYPE_BUILTIN;
+        sc->server->pphrase_dialog_path = NULL;
+    }
+    else if ((arglen > 5) && strEQn(arg, "exec:", 5)) {
+        sc->server->pphrase_dialog_type  = SSL_PPTYPE_FILTER;
+        sc->server->pphrase_dialog_path =
+            ap_server_root_relative(cmd->pool, arg+5);
+        if (!sc->server->pphrase_dialog_path) {
+            return apr_pstrcat(cmd->pool,
+                               "Invalid SSLPassPhraseDialog exec: path ",
+                               arg+5, NULL);
+        }
+        if (!ssl_util_path_check(SSL_PCM_EXISTS,
+                                 sc->server->pphrase_dialog_path,
+                                 cmd->pool))
+        {
+            return apr_pstrcat(cmd->pool,
+                               "SSLPassPhraseDialog: file '",
+                               sc->server->pphrase_dialog_path,
+                               "' does not exist", NULL);
+        }
+
+    }
+    else if ((arglen > 1) && (arg[0] == '|')) {
+        sc->server->pphrase_dialog_type  = SSL_PPTYPE_PIPE;
+        sc->server->pphrase_dialog_path = arg + 1;
+    }
+    else {
+        return "SSLPassPhraseDialog: Invalid argument";
+    }
+
+    return NULL;
+}
+
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+const char *ssl_cmd_SSLCryptoDevice(cmd_parms *cmd,
+                                    void *dcfg,
+                                    const char *arg)
+{
+    SSLModConfigRec *mc = myModConfig(cmd->server);
+    const char *err;
+    ENGINE *e;
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+    if (strcEQ(arg, "builtin")) {
+        mc->szCryptoDevice = NULL;
+    }
+    else if ((e = ENGINE_by_id(arg))) {
+        mc->szCryptoDevice = arg;
+        ENGINE_free(e);
+    }
+    else {
+        err = "SSLCryptoDevice: Invalid argument; must be one of: "
+              "'builtin' (none)";
+        e = ENGINE_get_first();
+        while (e) {
+            err = apr_pstrcat(cmd->pool, err, ", '", ENGINE_get_id(e),
+                                         "' (", ENGINE_get_name(e), ")", NULL);
+            /* Iterate; this call implicitly decrements the refcount
+             * on the 'old' e, per the docs in engine.h. */
+            e = ENGINE_get_next(e);
+        }
+        return err;
+    }
+
+    return NULL;
+}
+#endif
+
+const char *ssl_cmd_SSLRandomSeed(cmd_parms *cmd,
+                                  void *dcfg,
+                                  const char *arg1,
+                                  const char *arg2,
+                                  const char *arg3)
+{
+    SSLModConfigRec *mc = myModConfig(cmd->server);
+    const char *err;
+    ssl_randseed_t *seed;
+    int arg2len = strlen(arg2);
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+    if (ssl_config_global_isfixed(mc)) {
+        return NULL;
+    }
+
+    seed = apr_array_push(mc->aRandSeed);
+
+    if (strcEQ(arg1, "startup")) {
+        seed->nCtx = SSL_RSCTX_STARTUP;
+    }
+    else if (strcEQ(arg1, "connect")) {
+        seed->nCtx = SSL_RSCTX_CONNECT;
+    }
+    else {
+        return apr_pstrcat(cmd->pool, "SSLRandomSeed: "
+                           "invalid context: `", arg1, "'",
+                           NULL);
+    }
+
+    if ((arg2len > 5) && strEQn(arg2, "file:", 5)) {
+        seed->nSrc   = SSL_RSSRC_FILE;
+        seed->cpPath = ap_server_root_relative(mc->pPool, arg2+5);
+    }
+    else if ((arg2len > 5) && strEQn(arg2, "exec:", 5)) {
+        seed->nSrc   = SSL_RSSRC_EXEC;
+        seed->cpPath = ap_server_root_relative(mc->pPool, arg2+5);
+    }
+    else if ((arg2len > 4) && strEQn(arg2, "egd:", 4)) {
+#ifdef HAVE_RAND_EGD
+        seed->nSrc   = SSL_RSSRC_EGD;
+        seed->cpPath = ap_server_root_relative(mc->pPool, arg2+4);
+#else
+        return apr_pstrcat(cmd->pool, "Invalid SSLRandomSeed entropy source `",
+                           arg2, "': This version of " MODSSL_LIBRARY_NAME
+                           " does not support the Entropy Gathering Daemon "
+                           "(EGD).", NULL);
+#endif
+    }
+    else if (strcEQ(arg2, "builtin")) {
+        seed->nSrc   = SSL_RSSRC_BUILTIN;
+        seed->cpPath = NULL;
+    }
+    else {
+        seed->nSrc   = SSL_RSSRC_FILE;
+        seed->cpPath = ap_server_root_relative(mc->pPool, arg2);
+    }
+
+    if (seed->nSrc != SSL_RSSRC_BUILTIN) {
+        if (!seed->cpPath) {
+            return apr_pstrcat(cmd->pool,
+                               "Invalid SSLRandomSeed path ",
+                               arg2, NULL);
+        }
+        if (!ssl_util_path_check(SSL_PCM_EXISTS, seed->cpPath, cmd->pool)) {
+            return apr_pstrcat(cmd->pool,
+                               "SSLRandomSeed: source path '",
+                               seed->cpPath, "' does not exist", NULL);
+        }
+    }
+
+    if (!arg3) {
+        seed->nBytes = 0; /* read whole file */
+    }
+    else {
+        if (seed->nSrc == SSL_RSSRC_BUILTIN) {
+            return "SSLRandomSeed: byte specification not "
+                   "allowed for builtin seed source";
+        }
+
+        seed->nBytes = atoi(arg3);
+
+        if (seed->nBytes < 0) {
+            return "SSLRandomSeed: invalid number of bytes specified";
+        }
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLEngine(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    if (!strcasecmp(arg, "On")) {
+        sc->enabled = SSL_ENABLED_TRUE;
+        return NULL;
+    }
+    else if (!strcasecmp(arg, "Off")) {
+        sc->enabled = SSL_ENABLED_FALSE;
+        return NULL;
+    }
+    else if (!strcasecmp(arg, "Optional")) {
+        sc->enabled = SSL_ENABLED_OPTIONAL;
+        return NULL;
+    }
+
+    return "Argument must be On, Off, or Optional";
+}
+
+const char *ssl_cmd_SSLFIPS(cmd_parms *cmd, void *dcfg, int flag)
+{
+#ifdef HAVE_FIPS
+    SSLModConfigRec *mc = myModConfig(cmd->server);
+#endif
+    const char *err;
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+#ifdef HAVE_FIPS
+    if ((mc->fips != UNSET) && (mc->fips != (BOOL)(flag ? TRUE : FALSE)))
+        return "Conflicting SSLFIPS options, cannot be both On and Off";
+    mc->fips = flag ? TRUE : FALSE;
+#else
+    if (flag)
+        return "SSLFIPS invalid, rebuild httpd and openssl compiled for FIPS";
+#endif
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCipherSuite(cmd_parms *cmd,
+                                   void *dcfg,
+                                   const char *arg1, const char *arg2)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    if (arg2 == NULL) {
+        arg2 = arg1;
+        arg1 = "SSL";
+    }
+    
+    if (!strcmp("SSL", arg1)) {
+        /* always disable null and export ciphers */
+        arg2 = apr_pstrcat(cmd->pool, arg2, ":!aNULL:!eNULL:!EXP", NULL);
+        if (cmd->path) {
+            dc->szCipherSuite = arg2;
+        }
+        else {
+            sc->server->auth.cipher_suite = arg2;
+        }
+        return NULL;
+    }
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    else if (!strcmp("TLSv1.3", arg1)) {
+        if (cmd->path) {
+            return "TLSv1.3 ciphers cannot be set inside a directory context";
+        }
+        sc->server->auth.tls13_ciphers = arg2;
+        return NULL;
+    }
+#endif
+    return apr_pstrcat(cmd->pool, "protocol '", arg1, "' not supported", NULL);
+}
+
+#define SSL_FLAGS_CHECK_FILE \
+    (SSL_PCM_EXISTS|SSL_PCM_ISREG|SSL_PCM_ISNONZERO)
+
+#define SSL_FLAGS_CHECK_DIR \
+    (SSL_PCM_EXISTS|SSL_PCM_ISDIR)
+
+static const char *ssl_cmd_check_file(cmd_parms *parms,
+                                      const char **file)
+{
+    const char *filepath;
+
+    /* If only dumping the config, don't verify the paths */
+    if (ap_state_query(AP_SQ_RUN_MODE) == AP_SQ_RM_CONFIG_DUMP) {
+        return NULL;
+    }
+
+    filepath = ap_server_root_relative(parms->pool, *file);
+    if (!filepath) {
+        return apr_pstrcat(parms->pool, parms->cmd->name,
+                           ": Invalid file path ", *file, NULL);
+    }
+    *file = filepath;
+
+    if (ssl_util_path_check(SSL_FLAGS_CHECK_FILE, *file, parms->pool)) {
+        return NULL;
+    }
+
+    return apr_pstrcat(parms->pool, parms->cmd->name,
+                       ": file '", *file,
+                       "' does not exist or is empty", NULL);
+
+}
+
+const char *ssl_cmd_SSLCompression(cmd_parms *cmd, void *dcfg, int flag)
+{
+#if !defined(OPENSSL_NO_COMP)
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+#ifndef SSL_OP_NO_COMPRESSION
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err)
+        return "This version of OpenSSL does not support enabling "
+               "SSLCompression within <VirtualHost> sections.";
+#endif
+    if (flag) {
+        /* Some (packaged) versions of OpenSSL do not support
+         * compression by default.  Enabling this directive would not
+         * have the desired effect, so fail with an error. */
+        STACK_OF(SSL_COMP) *meths = SSL_COMP_get_compression_methods();
+
+        if (sk_SSL_COMP_num(meths) == 0) {
+            return "This version of OpenSSL does not have any compression methods "
+                "available, cannot enable SSLCompression.";
+        }
+    }
+    sc->compression = flag ? TRUE : FALSE;
+    return NULL;
+#else
+    return "Setting Compression mode unsupported; not implemented by the SSL library";
+#endif
+}
+
+const char *ssl_cmd_SSLHonorCipherOrder(cmd_parms *cmd, void *dcfg, int flag)
+{
+#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->cipher_server_pref = flag?TRUE:FALSE;
+    return NULL;
+#else
+    return "SSLHonorCipherOrder unsupported; not implemented by the SSL library";
+#endif
+}
+
+const char *ssl_cmd_SSLSessionTickets(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+#ifndef SSL_OP_NO_TICKET
+    return "This version of OpenSSL does not support using "
+           "SSLSessionTickets.";
+#endif
+    sc->session_tickets = flag ? TRUE : FALSE;
+    return NULL;
+}
+
+const char *ssl_cmd_SSLInsecureRenegotiation(cmd_parms *cmd, void *dcfg, int flag)
+{
+#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->insecure_reneg = flag?TRUE:FALSE;
+    return NULL;
+#else
+    return "The SSLInsecureRenegotiation directive is not available "
+        "with this SSL library";
+#endif
+}
+
+
+static const char *ssl_cmd_check_dir(cmd_parms *parms,
+                                     const char **dir)
+{
+    const char *dirpath = ap_server_root_relative(parms->pool, *dir);
+
+    if (!dirpath) {
+        return apr_pstrcat(parms->pool, parms->cmd->name,
+                           ": Invalid dir path ", *dir, NULL);
+    }
+    *dir = dirpath;
+
+    if (ssl_util_path_check(SSL_FLAGS_CHECK_DIR, *dir, parms->pool)) {
+        return NULL;
+    }
+
+    return apr_pstrcat(parms->pool, parms->cmd->name,
+                       ": directory '", *dir,
+                       "' does not exist", NULL);
+
+}
+
+const char *ssl_cmd_SSLCertificateFile(cmd_parms *cmd,
+                                       void *dcfg,
+                                       const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    /* Only check for non-ENGINE based certs. */
+    if (!modssl_is_engine_id(arg)
+        && (err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    *(const char **)apr_array_push(sc->server->pks->cert_files) = arg;
+    
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCertificateKeyFile(cmd_parms *cmd,
+                                          void *dcfg,
+                                          const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    /* Check keyfile exists for non-ENGINE keys. */
+    if (!modssl_is_engine_id(arg)
+        && (err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    *(const char **)apr_array_push(sc->server->pks->key_files) = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCertificateChainFile(cmd_parms *cmd,
+                                            void *dcfg,
+                                            const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->cert_chain = arg;
+
+    return NULL;
+}
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+const char *ssl_cmd_SSLSessionTicketKeyFile(cmd_parms *cmd,
+                                            void *dcfg,
+                                            const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->ticket_key->file_path = arg;
+
+    return NULL;
+}
+#endif
+
+#define NO_PER_DIR_SSL_CA \
+    "Your SSL library does not have support for per-directory CA"
+
+const char *ssl_cmd_SSLCACertificatePath(cmd_parms *cmd,
+                                         void *dcfg,
+                                         const char *arg)
+{
+    /*SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;*/
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    if (cmd->path) {
+        return NO_PER_DIR_SSL_CA;
+    }
+
+    /* XXX: bring back per-dir */
+    sc->server->auth.ca_cert_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCACertificateFile(cmd_parms *cmd,
+                                         void *dcfg,
+                                         const char *arg)
+{
+    /*SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;*/
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    if (cmd->path) {
+        return NO_PER_DIR_SSL_CA;
+    }
+
+    /* XXX: bring back per-dir */
+    sc->server->auth.ca_cert_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCADNRequestPath(cmd_parms *cmd, void *dcfg,
+                                       const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->pks->ca_name_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCADNRequestFile(cmd_parms *cmd, void *dcfg,
+                                       const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->pks->ca_name_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCARevocationPath(cmd_parms *cmd,
+                                        void *dcfg,
+                                        const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->crl_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCARevocationFile(cmd_parms *cmd,
+                                        void *dcfg,
+                                        const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->crl_file = arg;
+
+    return NULL;
+}
+
+static const char *ssl_cmd_crlcheck_parse(cmd_parms *parms,
+                                          const char *arg,
+                                          int *mask)
+{
+    const char *w;
+
+    w = ap_getword_conf(parms->temp_pool, &arg);
+    if (strcEQ(w, "none")) {
+        *mask = SSL_CRLCHECK_NONE;
+    }
+    else if (strcEQ(w, "leaf")) {
+        *mask = SSL_CRLCHECK_LEAF;
+    }
+    else if (strcEQ(w, "chain")) {
+        *mask = SSL_CRLCHECK_CHAIN;
+    }
+    else {
+        return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                           ": Invalid argument '", w, "'",
+                           NULL);
+    }
+
+    while (*arg) {
+        w = ap_getword_conf(parms->temp_pool, &arg);
+        if (strcEQ(w, "no_crl_for_cert_ok")) {
+            *mask |= SSL_CRLCHECK_NO_CRL_FOR_CERT_OK;
+        }
+        else {
+            return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                               ": Invalid argument '", w, "'",
+                               NULL);
+        }
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLCARevocationCheck(cmd_parms *cmd,
+                                         void *dcfg,
+                                         const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    return ssl_cmd_crlcheck_parse(cmd, arg, &sc->server->crl_check_mask);
+}
+
+static const char *ssl_cmd_verify_parse(cmd_parms *parms,
+                                        const char *arg,
+                                        ssl_verify_t *id)
+{
+    if (strcEQ(arg, "none") || strcEQ(arg, "off")) {
+        *id = SSL_CVERIFY_NONE;
+    }
+    else if (strcEQ(arg, "optional")) {
+        *id = SSL_CVERIFY_OPTIONAL;
+    }
+    else if (strcEQ(arg, "require") || strcEQ(arg, "on")) {
+        *id = SSL_CVERIFY_REQUIRE;
+    }
+    else if (strcEQ(arg, "optional_no_ca")) {
+        *id = SSL_CVERIFY_OPTIONAL_NO_CA;
+    }
+    else {
+        return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                           ": Invalid argument '", arg, "'",
+                           NULL);
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLVerifyClient(cmd_parms *cmd,
+                                    void *dcfg,
+                                    const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    ssl_verify_t mode = SSL_CVERIFY_NONE;
+    const char *err;
+
+    if ((err = ssl_cmd_verify_parse(cmd, arg, &mode))) {
+        return err;
+    }
+
+    if (cmd->path) {
+        dc->nVerifyClient = mode;
+    }
+    else {
+        sc->server->auth.verify_mode = mode;
+    }
+
+    return NULL;
+}
+
+static const char *ssl_cmd_verify_depth_parse(cmd_parms *parms,
+                                              const char *arg,
+                                              int *depth)
+{
+    if ((*depth = atoi(arg)) >= 0) {
+        return NULL;
+    }
+
+    return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                       ": Invalid argument '", arg, "'",
+                       NULL);
+}
+
+const char *ssl_cmd_SSLVerifyDepth(cmd_parms *cmd,
+                                   void *dcfg,
+                                   const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    int depth;
+    const char *err;
+
+    if ((err = ssl_cmd_verify_depth_parse(cmd, arg, &depth))) {
+        return err;
+    }
+
+    if (cmd->path) {
+        dc->nVerifyDepth = depth;
+    }
+    else {
+        sc->server->auth.verify_depth = depth;
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLSessionCache(cmd_parms *cmd,
+                                    void *dcfg,
+                                    const char *arg)
+{
+    SSLModConfigRec *mc = myModConfig(cmd->server);
+    const char *err, *sep, *name;
+    long enabled_flags;
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+    /* The OpenSSL session cache mode must have both the flags
+     * SSL_SESS_CACHE_SERVER and SSL_SESS_CACHE_NO_INTERNAL set if a
+     * session cache is configured; NO_INTERNAL prevents the
+     * OpenSSL-internal session cache being used in addition to the
+     * "external" (mod_ssl-provided) cache, which otherwise causes
+     * additional memory consumption. */
+    enabled_flags = SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_INTERNAL;
+
+    if (strcEQ(arg, "none")) {
+        /* Nothing to do; session cache will be off. */
+    }
+    else if (strcEQ(arg, "nonenotnull")) {
+        /* ### Having a separate mode for this seems logically
+         * unnecessary; the stated purpose of sending non-empty
+         * session IDs would be better fixed in OpenSSL or simply
+         * doing it by default if "none" is used. */
+        mc->sesscache_mode = enabled_flags;
+    }
+    else {
+        /* Argument is of form 'name:args' or just 'name'. */
+        sep = ap_strchr_c(arg, ':');
+        if (sep) {
+            name = apr_pstrmemdup(cmd->pool, arg, sep - arg);
+            sep++;
+        }
+        else {
+            name = arg;
+        }
+
+        /* Find the provider of given name. */
+        mc->sesscache = ap_lookup_provider(AP_SOCACHE_PROVIDER_GROUP,
+                                           name,
+                                           AP_SOCACHE_PROVIDER_VERSION);
+        if (mc->sesscache) {
+            /* Cache found; create it, passing anything beyond the colon. */
+            mc->sesscache_mode = enabled_flags;
+            err = mc->sesscache->create(&mc->sesscache_context, sep,
+                                        cmd->temp_pool, cmd->pool);
+        }
+        else {
+            apr_array_header_t *name_list;
+            const char *all_names;
+
+            /* Build a comma-separated list of all registered provider
+             * names: */
+            name_list = ap_list_provider_names(cmd->pool,
+                                               AP_SOCACHE_PROVIDER_GROUP,
+                                               AP_SOCACHE_PROVIDER_VERSION);
+            all_names = apr_array_pstrcat(cmd->pool, name_list, ',');
+
+            err = apr_psprintf(cmd->pool, "'%s' session cache not supported "
+                               "(known names: %s). Maybe you need to load the "
+                               "appropriate socache module (mod_socache_%s?).",
+                               name, all_names, name);
+        }
+    }
+
+    if (err) {
+        return apr_psprintf(cmd->pool, "SSLSessionCache: %s", err);
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLSessionCacheTimeout(cmd_parms *cmd,
+                                           void *dcfg,
+                                           const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->session_cache_timeout = atoi(arg);
+
+    if (sc->session_cache_timeout < 0) {
+        return "SSLSessionCacheTimeout: Invalid argument";
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOptions(cmd_parms *cmd,
+                               void *dcfg,
+                               const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    ssl_opt_t opt;
+    int first = TRUE;
+    char action, *w;
+
+    while (*arg) {
+        w = ap_getword_conf(cmd->temp_pool, &arg);
+        action = NUL;
+
+        if ((*w == '+') || (*w == '-')) {
+            action = *(w++);
+        }
+        else if (first) {
+            dc->nOptions = SSL_OPT_NONE;
+            first = FALSE;
+        }
+
+        if (strcEQ(w, "StdEnvVars")) {
+            opt = SSL_OPT_STDENVVARS;
+        }
+        else if (strcEQ(w, "ExportCertData")) {
+            opt = SSL_OPT_EXPORTCERTDATA;
+        }
+        else if (strcEQ(w, "FakeBasicAuth")) {
+            opt = SSL_OPT_FAKEBASICAUTH;
+        }
+        else if (strcEQ(w, "StrictRequire")) {
+            opt = SSL_OPT_STRICTREQUIRE;
+        }
+        else if (strcEQ(w, "OptRenegotiate")) {
+            opt = SSL_OPT_OPTRENEGOTIATE;
+        }
+        else if (strcEQ(w, "LegacyDNStringFormat")) {
+            opt = SSL_OPT_LEGACYDNFORMAT;
+        }
+        else {
+            return apr_pstrcat(cmd->pool,
+                               "SSLOptions: Illegal option '", w, "'",
+                               NULL);
+        }
+
+        if (action == '-') {
+            dc->nOptionsAdd &= ~opt;
+            dc->nOptionsDel |=  opt;
+            dc->nOptions    &= ~opt;
+        }
+        else if (action == '+') {
+            dc->nOptionsAdd |=  opt;
+            dc->nOptionsDel &= ~opt;
+            dc->nOptions    |=  opt;
+        }
+        else {
+            dc->nOptions    = opt;
+            dc->nOptionsAdd = opt;
+            dc->nOptionsDel = SSL_OPT_NONE;
+        }
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLRequireSSL(cmd_parms *cmd, void *dcfg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->bSSLRequired = TRUE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLRequire(cmd_parms *cmd,
+                               void *dcfg,
+                               const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    ap_expr_info_t *info = apr_pcalloc(cmd->pool, sizeof(ap_expr_info_t));
+    ssl_require_t *require;
+    const char *errstring;
+
+    info->flags = AP_EXPR_FLAG_SSL_EXPR_COMPAT;
+    info->filename = cmd->directive->filename;
+    info->line_number = cmd->directive->line_num;
+    info->module_index = APLOG_MODULE_INDEX;
+    errstring = ap_expr_parse(cmd->pool, cmd->temp_pool, info, arg, NULL);
+    if (errstring) {
+        return apr_pstrcat(cmd->pool, "SSLRequire: ", errstring, NULL);
+    }
+
+    require = apr_array_push(dc->aRequirement);
+    require->cpExpr = arg;
+    require->mpExpr = info;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLRenegBufferSize(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLDirConfigRec *dc = dcfg;
+    int val;
+
+    val = atoi(arg);
+    if (val < 0) {
+        return apr_pstrcat(cmd->pool, "Invalid size for SSLRenegBufferSize: ",
+                           arg, NULL);
+    }
+    dc->nRenegBufferSize = val;
+
+    return NULL;
+}
+
+static const char *ssl_cmd_protocol_parse(cmd_parms *parms,
+                                          const char *arg,
+                                          ssl_proto_t *options)
+{
+    ssl_proto_t thisopt;
+
+    *options = SSL_PROTOCOL_NONE;
+
+    while (*arg) {
+        char *w = ap_getword_conf(parms->temp_pool, &arg);
+        char action = '\0';
+
+        if ((*w == '+') || (*w == '-')) {
+            action = *(w++);
+        }
+
+        if (strcEQ(w, "SSLv2")) {
+            if (action == '-') {
+                continue;
+            }
+            else {
+                return "SSLProtocol: SSLv2 is no longer supported";
+            }
+        }
+        else if (strcEQ(w, "SSLv3")) {
+#ifdef OPENSSL_NO_SSL3
+            if (action != '-') {
+                return "SSLv3 not supported by this version of OpenSSL";
+            }
+            /* Nothing to do, the flag is not present to be toggled */
+            continue;
+#else
+            thisopt = SSL_PROTOCOL_SSLV3;
+#endif
+        }
+        else if (strcEQ(w, "TLSv1")) {
+            thisopt = SSL_PROTOCOL_TLSV1;
+        }
+#ifdef HAVE_TLSV1_X
+        else if (strcEQ(w, "TLSv1.1")) {
+            thisopt = SSL_PROTOCOL_TLSV1_1;
+        }
+        else if (strcEQ(w, "TLSv1.2")) {
+            thisopt = SSL_PROTOCOL_TLSV1_2;
+        }
+        else if (SSL_HAVE_PROTOCOL_TLSV1_3 && strcEQ(w, "TLSv1.3")) {
+            thisopt = SSL_PROTOCOL_TLSV1_3;
+        }
+#endif
+        else if (strcEQ(w, "all")) {
+            thisopt = SSL_PROTOCOL_ALL;
+        }
+        else {
+            return apr_pstrcat(parms->temp_pool,
+                               parms->cmd->name,
+                               ": Illegal protocol '", w, "'", NULL);
+        }
+
+        if (action == '-') {
+            *options &= ~thisopt;
+        }
+        else if (action == '+') {
+            *options |= thisopt;
+        }
+        else {
+            if (*options != SSL_PROTOCOL_NONE) {
+                ap_log_error(APLOG_MARK, APLOG_WARNING, 0, parms->server, APLOGNO(02532)
+                             "%s: Protocol '%s' overrides already set parameter(s). "
+                             "Check if a +/- prefix is missing.",
+                             parms->cmd->name, w);
+            }
+            *options = thisopt;
+        }
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProtocol(cmd_parms *cmd,
+                                void *dcfg,
+                                const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->server->protocol_set = 1;
+    return ssl_cmd_protocol_parse(cmd, arg, &sc->server->protocol);
+}
+
+const char *ssl_cmd_SSLProxyEngine(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->proxy_enabled = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyProtocol(cmd_parms *cmd,
+                                     void *dcfg,
+                                     const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->proxy->protocol_set = 1;
+    return ssl_cmd_protocol_parse(cmd, arg, &dc->proxy->protocol);
+}
+
+const char *ssl_cmd_SSLProxyCipherSuite(cmd_parms *cmd,
+                                        void *dcfg,
+                                        const char *arg1, const char *arg2)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    
+    if (arg2 == NULL) {
+        arg2 = arg1;
+        arg1 = "SSL";
+    }
+    
+    if (!strcmp("SSL", arg1)) {
+        /* always disable null and export ciphers */
+        arg2 = apr_pstrcat(cmd->pool, arg2, ":!aNULL:!eNULL:!EXP", NULL);
+        dc->proxy->auth.cipher_suite = arg2;
+        return NULL;
+    }
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    else if (!strcmp("TLSv1.3", arg1)) {
+        dc->proxy->auth.tls13_ciphers = arg2;
+        return NULL;
+    }
+#endif
+    return apr_pstrcat(cmd->pool, "protocol '", arg1, "' not supported", NULL);
+}
+
+const char *ssl_cmd_SSLProxyVerify(cmd_parms *cmd,
+                                   void *dcfg,
+                                   const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    ssl_verify_t mode = SSL_CVERIFY_NONE;
+    const char *err;
+
+    if ((err = ssl_cmd_verify_parse(cmd, arg, &mode))) {
+        return err;
+    }
+
+    dc->proxy->auth.verify_mode = mode;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyVerifyDepth(cmd_parms *cmd,
+                                        void *dcfg,
+                                        const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    int depth;
+    const char *err;
+
+    if ((err = ssl_cmd_verify_depth_parse(cmd, arg, &depth))) {
+        return err;
+    }
+
+    dc->proxy->auth.verify_depth = depth;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCACertificateFile(cmd_parms *cmd,
+                                              void *dcfg,
+                                              const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->auth.ca_cert_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCACertificatePath(cmd_parms *cmd,
+                                              void *dcfg,
+                                              const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->auth.ca_cert_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCARevocationPath(cmd_parms *cmd,
+                                             void *dcfg,
+                                             const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->crl_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCARevocationFile(cmd_parms *cmd,
+                                             void *dcfg,
+                                             const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->crl_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCARevocationCheck(cmd_parms *cmd,
+                                              void *dcfg,
+                                              const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    return ssl_cmd_crlcheck_parse(cmd, arg, &dc->proxy->crl_check_mask);
+}
+
+const char *ssl_cmd_SSLProxyMachineCertificateFile(cmd_parms *cmd,
+                                                   void *dcfg,
+                                                   const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->pkp->cert_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyMachineCertificatePath(cmd_parms *cmd,
+                                                   void *dcfg,
+                                                   const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_dir(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->pkp->cert_path = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyMachineCertificateChainFile(cmd_parms *cmd,
+                                                   void *dcfg,
+                                                   const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    dc->proxy->pkp->ca_cert_file = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLUserName(cmd_parms *cmd, void *dcfg,
+                                const char *arg)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+    dc->szUserName = arg;
+    return NULL;
+}
+
+static const char *ssl_cmd_ocspcheck_parse(cmd_parms *parms,
+                                           const char *arg,
+                                           int *mask)
+{
+    const char *w;
+
+    w = ap_getword_conf(parms->temp_pool, &arg);
+    if (strcEQ(w, "off")) {
+        *mask = SSL_OCSPCHECK_NONE;
+    }
+    else if (strcEQ(w, "leaf")) {
+        *mask = SSL_OCSPCHECK_LEAF;
+    }
+    else if (strcEQ(w, "on")) {
+        *mask = SSL_OCSPCHECK_CHAIN;
+    }
+    else {
+        return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                           ": Invalid argument '", w, "'",
+                           NULL);
+    }
+
+    while (*arg) {
+        w = ap_getword_conf(parms->temp_pool, &arg);
+        if (strcEQ(w, "no_ocsp_for_cert_ok")) {
+            *mask |= SSL_OCSPCHECK_NO_OCSP_FOR_CERT_OK;
+        }
+        else {
+            return apr_pstrcat(parms->temp_pool, parms->cmd->name,
+                               ": Invalid argument '", w, "'",
+                               NULL);
+        }
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPEnable(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+#ifdef OPENSSL_NO_OCSP
+    if (flag) {
+        return "OCSP support disabled in SSL library; cannot enable "
+            "OCSP validation";
+    }
+#endif
+
+    return ssl_cmd_ocspcheck_parse(cmd, arg, &sc->server->ocsp_mask);
+}
+
+const char *ssl_cmd_SSLOCSPOverrideResponder(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->server->ocsp_force_default = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPDefaultResponder(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->server->ocsp_responder = arg;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPResponseTimeSkew(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->ocsp_resptime_skew = atoi(arg);
+    if (sc->server->ocsp_resptime_skew < 0) {
+        return "SSLOCSPResponseTimeSkew: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPResponseMaxAge(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->ocsp_resp_maxage = atoi(arg);
+    if (sc->server->ocsp_resp_maxage < 0) {
+        return "SSLOCSPResponseMaxAge: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPResponderTimeout(cmd_parms *cmd, void *dcfg, const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->ocsp_responder_timeout = apr_time_from_sec(atoi(arg));
+    if (sc->server->ocsp_responder_timeout < 0) {
+        return "SSLOCSPResponderTimeout: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPUseRequestNonce(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->server->ocsp_use_request_nonce = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLOCSPProxyURL(cmd_parms *cmd, void *dcfg,
+                                    const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->proxy_uri = apr_palloc(cmd->pool, sizeof(apr_uri_t));
+    if (apr_uri_parse(cmd->pool, arg, sc->server->proxy_uri) != APR_SUCCESS) {
+        return apr_psprintf(cmd->pool,
+                            "SSLOCSPProxyURL: Cannot parse URL %s", arg);
+    }
+    return NULL;
+}
+
+/* Set OCSP responder certificate verification directive */
+const char *ssl_cmd_SSLOCSPNoVerify(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->server->ocsp_noverify = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCheckPeerExpire(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->proxy->ssl_check_peer_expire = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCheckPeerCN(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->proxy->ssl_check_peer_cn = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLProxyCheckPeerName(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLDirConfigRec *dc = (SSLDirConfigRec *)dcfg;
+
+    dc->proxy->ssl_check_peer_name = flag ? TRUE : FALSE;
+
+    return NULL;
+}
+
+const char  *ssl_cmd_SSLStrictSNIVHostCheck(cmd_parms *cmd, void *dcfg, int flag)
+{
+#ifdef HAVE_TLSEXT
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+    sc->strict_sni_vhost_check = flag ? SSL_ENABLED_TRUE : SSL_ENABLED_FALSE;
+
+    return NULL;
+#else
+    return "SSLStrictSNIVHostCheck failed; OpenSSL is not built with support "
+           "for TLS extensions and SNI indication. Refer to the "
+           "documentation, and build a compatible version of OpenSSL.";
+#endif
+}
+
+#ifdef HAVE_OCSP_STAPLING
+
+const char *ssl_cmd_SSLStaplingCache(cmd_parms *cmd,
+                                    void *dcfg,
+                                    const char *arg)
+{
+    SSLModConfigRec *mc = myModConfig(cmd->server);
+    const char *err, *sep, *name;
+
+    if ((err = ap_check_cmd_context(cmd, GLOBAL_ONLY))) {
+        return err;
+    }
+
+    /* Argument is of form 'name:args' or just 'name'. */
+    sep = ap_strchr_c(arg, ':');
+    if (sep) {
+        name = apr_pstrmemdup(cmd->pool, arg, sep - arg);
+        sep++;
+    }
+    else {
+        name = arg;
+    }
+
+    /* Find the provider of given name. */
+    mc->stapling_cache = ap_lookup_provider(AP_SOCACHE_PROVIDER_GROUP,
+                                            name,
+                                            AP_SOCACHE_PROVIDER_VERSION);
+    if (mc->stapling_cache) {
+        /* Cache found; create it, passing anything beyond the colon. */
+        err = mc->stapling_cache->create(&mc->stapling_cache_context,
+                                         sep, cmd->temp_pool,
+                                         cmd->pool);
+    }
+    else {
+        apr_array_header_t *name_list;
+        const char *all_names;
+
+        /* Build a comma-separated list of all registered provider
+         * names: */
+        name_list = ap_list_provider_names(cmd->pool,
+                                           AP_SOCACHE_PROVIDER_GROUP,
+                                           AP_SOCACHE_PROVIDER_VERSION);
+        all_names = apr_array_pstrcat(cmd->pool, name_list, ',');
+
+        err = apr_psprintf(cmd->pool, "'%s' stapling cache not supported "
+                           "(known names: %s) Maybe you need to load the "
+                           "appropriate socache module (mod_socache_%s?)",
+                           name, all_names, name);
+    }
+
+    if (err) {
+        return apr_psprintf(cmd->pool, "SSLStaplingCache: %s", err);
+    }
+
+    return NULL;
+}
+
+const char *ssl_cmd_SSLUseStapling(cmd_parms *cmd, void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_enabled = flag ? TRUE : FALSE;
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingResponseTimeSkew(cmd_parms *cmd, void *dcfg,
+                                                    const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_resptime_skew = atoi(arg);
+    if (sc->server->stapling_resptime_skew < 0) {
+        return "SSLStaplingResponseTimeSkew: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingResponseMaxAge(cmd_parms *cmd, void *dcfg,
+                                                    const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_resp_maxage = atoi(arg);
+    if (sc->server->stapling_resp_maxage < 0) {
+        return "SSLStaplingResponseMaxAge: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingStandardCacheTimeout(cmd_parms *cmd, void *dcfg,
+                                                    const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_cache_timeout = atoi(arg);
+    if (sc->server->stapling_cache_timeout < 0) {
+        return "SSLStaplingStandardCacheTimeout: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingErrorCacheTimeout(cmd_parms *cmd, void *dcfg,
+                                                 const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_errcache_timeout = atoi(arg);
+    if (sc->server->stapling_errcache_timeout < 0) {
+        return "SSLStaplingErrorCacheTimeout: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingReturnResponderErrors(cmd_parms *cmd,
+                                                     void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_return_errors = flag ? TRUE : FALSE;
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingFakeTryLater(cmd_parms *cmd,
+                                            void *dcfg, int flag)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_fake_trylater = flag ? TRUE : FALSE;
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingResponderTimeout(cmd_parms *cmd, void *dcfg,
+                                                const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_responder_timeout = atoi(arg);
+    sc->server->stapling_responder_timeout *= APR_USEC_PER_SEC;
+    if (sc->server->stapling_responder_timeout < 0) {
+        return "SSLStaplingResponderTimeout: invalid argument";
+    }
+    return NULL;
+}
+
+const char *ssl_cmd_SSLStaplingForceURL(cmd_parms *cmd, void *dcfg,
+                                        const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    sc->server->stapling_force_url = arg;
+    return NULL;
+}
+
+#endif /* HAVE_OCSP_STAPLING */
+
+#ifdef HAVE_SSL_CONF_CMD
+const char *ssl_cmd_SSLOpenSSLConfCmd(cmd_parms *cmd, void *dcfg,
+                                      const char *arg1, const char *arg2)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    SSL_CONF_CTX *cctx = sc->server->ssl_ctx_config;
+    int value_type = SSL_CONF_cmd_value_type(cctx, arg1);
+    const char *err;
+    ssl_ctx_param_t *param;
+
+    if (value_type == SSL_CONF_TYPE_UNKNOWN) {
+        return apr_psprintf(cmd->pool,
+                            "'%s': invalid OpenSSL configuration command",
+                            arg1);
+    }
+
+    if (value_type == SSL_CONF_TYPE_FILE) {
+        if ((err = ssl_cmd_check_file(cmd, &arg2)))
+            return err;
+    }
+    else if (value_type == SSL_CONF_TYPE_DIR) {
+        if ((err = ssl_cmd_check_dir(cmd, &arg2)))
+            return err;
+    }
+
+    if (strcEQ(arg1, "CipherString")) {
+        /* always disable null and export ciphers */
+        arg2 = apr_pstrcat(cmd->pool, arg2, ":!aNULL:!eNULL:!EXP", NULL);
+    }
+
+    param = apr_array_push(sc->server->ssl_ctx_param);
+    param->name = arg1;
+    param->value = arg2;
+    return NULL;
+}
+#endif
+
+#ifdef HAVE_SRP
+
+const char *ssl_cmd_SSLSRPVerifierFile(cmd_parms *cmd, void *dcfg,
+                                       const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg)))
+        return err;
+    /* SRP_VBASE_init takes char*, not const char*  */
+    sc->server->srp_vfile = apr_pstrdup(cmd->pool, arg);
+    return NULL;
+}
+
+const char *ssl_cmd_SSLSRPUnknownUserSeed(cmd_parms *cmd, void *dcfg,
+                                          const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    /* SRP_VBASE_new takes char*, not const char*  */
+    sc->server->srp_unknown_user_seed = apr_pstrdup(cmd->pool, arg);
+    return NULL;
+}
+
+#endif /* HAVE_SRP */
+
+/* OCSP Responder File Function to read in value */
+const char *ssl_cmd_SSLOCSPResponderCertificateFile(cmd_parms *cmd, void *dcfg, 
+					   const char *arg)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+    const char *err;
+
+    if ((err = ssl_cmd_check_file(cmd, &arg))) {
+        return err;
+    }
+
+    sc->server->ocsp_certs_file = arg;
+    return NULL;
+}
+
+void ssl_hook_ConfigTest(apr_pool_t *pconf, server_rec *s)
+{
+    apr_file_t *out = NULL;
+    if (!ap_exists_config_define("DUMP_CERTS")) {
+        return;
+    }
+    apr_file_open_stdout(&out, pconf);
+    apr_file_printf(out, "Server certificates:\n");
+
+    /* Dump the filenames of all configured server certificates to
+     * stdout. */
+    while (s) {
+        SSLSrvConfigRec *sc = mySrvConfig(s);
+
+        if (sc && sc->server && sc->server->pks) {
+            modssl_pk_server_t *const pks = sc->server->pks;
+            int i;
+
+            for (i = 0; (i < pks->cert_files->nelts) &&
+                        APR_ARRAY_IDX(pks->cert_files, i, const char *);
+                 i++) {
+                apr_file_printf(out, "  %s\n",
+                                APR_ARRAY_IDX(pks->cert_files,
+                                              i, const char *));
+            }
+        }
+
+        s = s->next;
+    }
+
+}
+
diff --git a/modules/ssl/ssl_engine_init.c b/modules/ssl/ssl_engine_init.c
new file mode 100644
index 0000000..825621d
--- /dev/null
+++ b/modules/ssl/ssl_engine_init.c
@@ -0,0 +1,2367 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_init.c
+ *  Initialization of Servers
+ */
+                             /* ``Recursive, adj.;
+                                  see Recursive.''
+                                        -- Unknown   */
+#include "ssl_private.h"
+#include "mod_ssl.h"
+#include "mod_ssl_openssl.h"
+#include "mpm_common.h"
+#include "mod_md.h"
+
+static apr_status_t ssl_init_ca_cert_path(server_rec *, apr_pool_t *, const char *,
+                                          STACK_OF(X509_NAME) *, STACK_OF(X509_INFO) *);
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, init_server,
+                                    (server_rec *s,apr_pool_t *p,int is_proxy,SSL_CTX *ctx),
+                                    (s,p,is_proxy,ctx), OK, DECLINED)
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, add_cert_files,
+                                    (server_rec *s, apr_pool_t *p, 
+                                    apr_array_header_t *cert_files, apr_array_header_t *key_files),
+                                    (s, p, cert_files, key_files),
+                                    OK, DECLINED)
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, add_fallback_cert_files,
+                                    (server_rec *s, apr_pool_t *p, 
+                                    apr_array_header_t *cert_files, apr_array_header_t *key_files),
+                                    (s, p, cert_files, key_files),
+                                    OK, DECLINED)
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, answer_challenge,
+                                    (conn_rec *c, const char *server_name, 
+                                    X509 **pcert, EVP_PKEY **pkey),
+                                    (c, server_name, pcert, pkey),
+                                    DECLINED, DECLINED)
+
+
+/*  _________________________________________________________________
+**
+**  Module Initialization
+**  _________________________________________________________________
+*/
+
+#ifdef HAVE_ECC
+#define KEYTYPES "RSA, DSA or ECC"
+#else 
+#define KEYTYPES "RSA or DSA"
+#endif
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+/* OpenSSL Pre-1.1.0 compatibility */
+/* Taken from OpenSSL 1.1.0 snapshot 20160410 */
+static int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
+{
+    /* q is optional */
+    if (p == NULL || g == NULL)
+        return 0;
+    BN_free(dh->p);
+    BN_free(dh->q);
+    BN_free(dh->g);
+    dh->p = p;
+    dh->q = q;
+    dh->g = g;
+
+    if (q != NULL) {
+        dh->length = BN_num_bits(q);
+    }
+
+    return 1;
+}
+
+/*
+ * Grab well-defined DH parameters from OpenSSL, see the BN_get_rfc*
+ * functions in <openssl/bn.h> for all available primes.
+ */
+static DH *make_dh_params(BIGNUM *(*prime)(BIGNUM *))
+{
+    DH *dh = DH_new();
+    BIGNUM *p, *g;
+
+    if (!dh) {
+        return NULL;
+    }
+    p = prime(NULL);
+    g = BN_new();
+    if (g != NULL) {
+        BN_set_word(g, 2);
+    }
+    if (!p || !g || !DH_set0_pqg(dh, p, NULL, g)) {
+        DH_free(dh);
+        BN_free(p);
+        BN_free(g);
+        return NULL;
+    }
+    return dh;
+}
+
+/* Storage and initialization for DH parameters. */
+static struct dhparam {
+    BIGNUM *(*const prime)(BIGNUM *); /* function to generate... */
+    DH *dh;                           /* ...this, used for keys.... */
+    const unsigned int min;           /* ...of length >= this. */
+} dhparams[] = {
+    { BN_get_rfc3526_prime_8192, NULL, 6145 },
+    { BN_get_rfc3526_prime_6144, NULL, 4097 },
+    { BN_get_rfc3526_prime_4096, NULL, 3073 },
+    { BN_get_rfc3526_prime_3072, NULL, 2049 },
+    { BN_get_rfc3526_prime_2048, NULL, 1025 },
+    { BN_get_rfc2409_prime_1024, NULL, 0 }
+};
+
+static void init_dh_params(void)
+{
+    unsigned n;
+
+    for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++)
+        dhparams[n].dh = make_dh_params(dhparams[n].prime);
+}
+
+static void free_dh_params(void)
+{
+    unsigned n;
+
+    /* DH_free() is a noop for a NULL parameter, so these are harmless
+     * in the (unexpected) case where these variables are already
+     * NULL. */
+    for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++) {
+        DH_free(dhparams[n].dh);
+        dhparams[n].dh = NULL;
+    }
+}
+
+/* Hand out the same DH structure though once generated as we leak
+ * memory otherwise and freeing the structure up after use would be
+ * hard to track and in fact is not needed at all as it is safe to
+ * use the same parameters over and over again security wise (in
+ * contrast to the keys itself) and code safe as the returned structure
+ * is duplicated by OpenSSL anyway. Hence no modification happens
+ * to our copy. */
+DH *modssl_get_dh_params(unsigned keylen)
+{
+    unsigned n;
+
+    for (n = 0; n < sizeof(dhparams)/sizeof(dhparams[0]); n++)
+        if (keylen >= dhparams[n].min)
+            return dhparams[n].dh;
+        
+    return NULL; /* impossible to reach. */
+}
+#endif
+
+static void ssl_add_version_components(apr_pool_t *ptemp, apr_pool_t *pconf,
+                                       server_rec *s)
+{
+    char *modver = ssl_var_lookup(ptemp, s, NULL, NULL, "SSL_VERSION_INTERFACE");
+    char *libver = ssl_var_lookup(ptemp, s, NULL, NULL, "SSL_VERSION_LIBRARY");
+    char *incver = ssl_var_lookup(ptemp, s, NULL, NULL,
+                                  "SSL_VERSION_LIBRARY_INTERFACE");
+
+    ap_add_version_component(pconf, libver);
+
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01876)
+                 "%s compiled against Server: %s, Library: %s",
+                 modver, AP_SERVER_BASEVERSION, incver);
+}
+
+/*  _________________________________________________________________
+**
+**  Let other answer special connection attempts. 
+**  Used in ACME challenge handling by mod_md.
+**  _________________________________________________________________
+*/
+
+int ssl_is_challenge(conn_rec *c, const char *servername, 
+                     X509 **pcert, EVP_PKEY **pkey,
+                     const char **pcert_pem, const char **pkey_pem)
+{
+    *pcert = NULL;
+    *pkey = NULL;
+    *pcert_pem = *pkey_pem = NULL;
+    if (ap_ssl_answer_challenge(c, servername, pcert_pem, pkey_pem)) {
+        return 1;
+    }
+    else if (OK == ssl_run_answer_challenge(c, servername, pcert, pkey)) {
+        return 1;
+    }
+    return 0;
+}
+
+#ifdef HAVE_FIPS
+static apr_status_t modssl_fips_cleanup(void *data)
+{
+    modssl_fips_enable(0);
+    return APR_SUCCESS;
+}
+#endif
+
+/*
+ *  Per-module initialization
+ */
+apr_status_t ssl_init_Module(apr_pool_t *p, apr_pool_t *plog,
+                             apr_pool_t *ptemp,
+                             server_rec *base_server)
+{
+    SSLModConfigRec *mc = myModConfig(base_server);
+    SSLSrvConfigRec *sc;
+    server_rec *s;
+    apr_status_t rv;
+    apr_array_header_t *pphrases;
+
+    if (SSLeay() < MODSSL_LIBRARY_VERSION) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(01882)
+                     "Init: this version of mod_ssl was compiled against "
+                     "a newer library (%s, version currently loaded is %s)"
+                     " - may result in undefined or erroneous behavior",
+                     MODSSL_LIBRARY_TEXT, MODSSL_LIBRARY_DYNTEXT);
+    }
+
+    /* We initialize mc->pid per-process in the child init,
+     * but it should be initialized for startup before we
+     * call ssl_rand_seed() below.
+     */
+    mc->pid = getpid();
+
+    /*
+     * Let us cleanup on restarts and exits
+     */
+    apr_pool_cleanup_register(p, base_server,
+                              ssl_init_ModuleKill,
+                              apr_pool_cleanup_null);
+
+    /*
+     * Any init round fixes the global config
+     */
+    ssl_config_global_create(base_server); /* just to avoid problems */
+    ssl_config_global_fix(mc);
+
+    /*
+     *  try to fix the configuration and open the dedicated SSL
+     *  logfile as early as possible
+     */
+    for (s = base_server; s; s = s->next) {
+        sc = mySrvConfig(s);
+
+        if (sc->server) {
+            sc->server->sc = sc;
+        }
+
+        /*
+         * Create the server host:port string because we need it a lot
+         */
+        if (sc->vhost_id) {
+            /* already set. This should only happen if this config rec is
+             * shared with another server. Argh! */
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10104) 
+                         "%s, SSLSrvConfigRec shared from %s", 
+                         ssl_util_vhostid(p, s), sc->vhost_id);
+        }
+        sc->vhost_id = ssl_util_vhostid(p, s);
+        sc->vhost_id_len = strlen(sc->vhost_id);
+
+        /* Default to enabled if SSLEngine is not set explicitly, and
+         * the protocol is https. */
+        if (ap_get_server_protocol(s) 
+            && strcmp("https", ap_get_server_protocol(s)) == 0
+            && sc->enabled == SSL_ENABLED_UNSET
+            && (!apr_is_empty_array(sc->server->pks->cert_files))) {
+            sc->enabled = SSL_ENABLED_TRUE;
+        }
+
+        /* Fix up stuff that may not have been set.  If sc->enabled is
+         * UNSET, then SSL is disabled on this vhost.  */
+        if (sc->enabled == SSL_ENABLED_UNSET) {
+            sc->enabled = SSL_ENABLED_FALSE;
+        }
+
+        if (sc->session_cache_timeout == UNSET) {
+            sc->session_cache_timeout = SSL_SESSION_CACHE_TIMEOUT;
+        }
+
+        if (sc->server && sc->server->pphrase_dialog_type == SSL_PPTYPE_UNSET) {
+            sc->server->pphrase_dialog_type = SSL_PPTYPE_BUILTIN;
+        }
+    }
+
+#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API
+    ssl_util_thread_setup(p);
+#endif
+
+    /*
+     * SSL external crypto device ("engine") support
+     */
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    if ((rv = ssl_init_Engine(base_server, p)) != APR_SUCCESS) {
+        return rv;
+    }
+#endif
+
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, base_server, APLOGNO(01883)
+                 "Init: Initialized %s library", MODSSL_LIBRARY_NAME);
+
+    /*
+     * Seed the Pseudo Random Number Generator (PRNG)
+     * only need ptemp here; nothing inside allocated from the pool
+     * needs to live once we return from ssl_rand_seed().
+     */
+    ssl_rand_seed(base_server, ptemp, SSL_RSCTX_STARTUP, "Init: ");
+
+#ifdef HAVE_FIPS
+    if (!modssl_fips_is_enabled() && mc->fips == TRUE) {
+        if (!modssl_fips_enable(1)) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, base_server, APLOGNO(01885)
+                         "Could not enable FIPS mode");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, base_server);
+            return ssl_die(base_server);
+        }
+
+        apr_pool_cleanup_register(p, NULL, modssl_fips_cleanup,
+                                  apr_pool_cleanup_null);
+    }
+
+    /* Log actual FIPS mode which the SSL library is operating under,
+     * which may have been set outside of the mod_ssl
+     * configuration. */
+    if (modssl_fips_is_enabled()) {
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, base_server, APLOGNO(01884)
+                     MODSSL_LIBRARY_NAME " has FIPS mode enabled");
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, base_server, APLOGNO(01886)
+                     MODSSL_LIBRARY_NAME " has FIPS mode disabled");
+    }
+#endif
+
+    /*
+     * initialize the mutex handling
+     */
+    if (!ssl_mutex_init(base_server, p)) {
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+#ifdef HAVE_OCSP_STAPLING
+    ssl_stapling_certinfo_hash_init(p);
+#endif
+
+    /*
+     * initialize session caching
+     */
+    if ((rv = ssl_scache_init(base_server, p)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    pphrases = apr_array_make(ptemp, 2, sizeof(char *));
+
+    /*
+     *  initialize servers
+     */
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, base_server, APLOGNO(01887)
+                 "Init: Initializing (virtual) servers for SSL");
+
+    for (s = base_server; s; s = s->next) {
+        sc = mySrvConfig(s);
+        /*
+         * Either now skip this server when SSL is disabled for
+         * it or give out some information about what we're
+         * configuring.
+         */
+
+        /*
+         * Read the server certificate and key
+         */
+        if ((rv = ssl_init_ConfigureServer(s, p, ptemp, sc, pphrases))
+            != APR_SUCCESS) {
+            return rv;
+        }
+    }
+
+    if (pphrases->nelts > 0) {
+        memset(pphrases->elts, 0, pphrases->elt_size * pphrases->nelts);
+        pphrases->nelts = 0;
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02560)
+                     "Init: Wiped out the queried pass phrases from memory");
+    }
+
+    /*
+     * Configuration consistency checks
+     */
+    if ((rv = ssl_init_CheckServers(base_server, ptemp)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    for (s = base_server; s; s = s->next) {
+        SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults,
+                                                    &ssl_module);
+
+        sc = mySrvConfig(s);
+        if (sc->enabled == SSL_ENABLED_TRUE || sc->enabled == SSL_ENABLED_OPTIONAL) {
+            if ((rv = ssl_run_init_server(s, p, 0, sc->server->ssl_ctx)) != APR_SUCCESS) {
+                return rv;
+            }
+        }
+
+        if (sdc->proxy_enabled) {
+            rv = ssl_run_init_server(s, p, 1, sdc->proxy->ssl_ctx);
+            if (rv != APR_SUCCESS) {
+                return rv;
+            }
+        }
+    }
+
+    /*
+     *  Announce mod_ssl and SSL library in HTTP Server field
+     *  as ``mod_ssl/X.X.X OpenSSL/X.X.X''
+     */
+    ssl_add_version_components(ptemp, p, base_server);
+
+    modssl_init_app_data2_idx(); /* for modssl_get_app_data2() at request time */
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    init_dh_params();
+#else
+    init_bio_methods();
+#endif
+
+#ifdef HAVE_OPENSSL_KEYLOG
+    {
+        const char *logfn = getenv("SSLKEYLOGFILE");
+
+        if (logfn) {
+            rv = apr_file_open(&mc->keylog_file, logfn,
+                               APR_FOPEN_CREATE|APR_FOPEN_WRITE|APR_FOPEN_APPEND|APR_FOPEN_LARGEFILE,
+                               APR_FPROT_UREAD|APR_FPROT_UWRITE,
+                               mc->pPool);
+            if (rv) {
+                ap_log_error(APLOG_MARK, APLOG_NOTICE, rv, s, APLOGNO(10226)
+                             "Could not open log file '%s' configured via SSLKEYLOGFILE",
+                             logfn);
+                return rv;
+            }
+
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(10227)
+                         "Init: Logging SSL private key material to %s", logfn);
+        }
+    }
+#endif
+    
+    return OK;
+}
+
+/*
+ * Support for external a Crypto Device ("engine"), usually
+ * a hardware accelerator card for crypto operations.
+ */
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+apr_status_t ssl_init_Engine(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    ENGINE *e;
+
+    if (mc->szCryptoDevice) {
+        if (!(e = ENGINE_by_id(mc->szCryptoDevice))) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01888)
+                         "Init: Failed to load Crypto Device API `%s'",
+                         mc->szCryptoDevice);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+
+#ifdef ENGINE_CTRL_CHIL_SET_FORKCHECK
+        if (strEQ(mc->szCryptoDevice, "chil")) {
+            ENGINE_ctrl(e, ENGINE_CTRL_CHIL_SET_FORKCHECK, 1, 0, 0);
+        }
+#endif
+
+        if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01889)
+                         "Init: Failed to enable Crypto Device API `%s'",
+                         mc->szCryptoDevice);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01890)
+                     "Init: loaded Crypto Device API `%s'",
+                     mc->szCryptoDevice);
+
+        ENGINE_free(e);
+    }
+
+    return APR_SUCCESS;
+}
+#endif
+
+#ifdef HAVE_TLSEXT
+static apr_status_t ssl_init_ctx_tls_extensions(server_rec *s,
+                                                apr_pool_t *p,
+                                                apr_pool_t *ptemp,
+                                                modssl_ctx_t *mctx)
+{
+    apr_status_t rv;
+
+    /*
+     * Configure TLS extensions support
+     */
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01893)
+                 "Configuring TLS extension handling");
+
+    /*
+     * The Server Name Indication (SNI) provided by the ClientHello can be
+     * used to select the right (name-based-)vhost and its SSL configuration
+     * before the handshake takes place.
+     */
+    if (!SSL_CTX_set_tlsext_servername_callback(mctx->ssl_ctx,
+                          ssl_callback_ServerNameIndication) ||
+        !SSL_CTX_set_tlsext_servername_arg(mctx->ssl_ctx, mctx)) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01894)
+                     "Unable to initialize TLS servername extension "
+                     "callback (incompatible OpenSSL version?)");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+    /*
+     * The ClientHello callback also allows to retrieve the SNI, but since it
+     * runs at the earliest possible connection stage we can even set the TLS
+     * protocol version(s) according to the selected (name-based-)vhost, which
+     * is not possible at the SNI callback stage (due to OpenSSL internals).
+     */
+    SSL_CTX_set_client_hello_cb(mctx->ssl_ctx, ssl_callback_ClientHello, NULL);
+#endif
+
+#ifdef HAVE_OCSP_STAPLING
+    /*
+     * OCSP Stapling support, status_request extension
+     */
+    if ((mctx->pkp == FALSE) && (mctx->stapling_enabled == TRUE)) {
+        if ((rv = modssl_init_stapling(s, p, ptemp, mctx)) != APR_SUCCESS) {
+            return rv;
+        }
+    }
+#endif
+
+#ifdef HAVE_SRP
+    /*
+     * TLS-SRP support
+     */
+    if (mctx->srp_vfile != NULL) {
+        int err;
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02308)
+                     "Using SRP verifier file [%s]", mctx->srp_vfile);
+
+        if (!(mctx->srp_vbase = SRP_VBASE_new(mctx->srp_unknown_user_seed))) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02309)
+                         "Unable to initialize SRP verifier structure "
+                         "[%s seed]",
+                         mctx->srp_unknown_user_seed ? "with" : "without");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+
+        err = SRP_VBASE_init(mctx->srp_vbase, mctx->srp_vfile);
+        if (err != SRP_NO_ERROR) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02310)
+                         "Unable to load SRP verifier file [error %d]", err);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+
+        SSL_CTX_set_srp_username_callback(mctx->ssl_ctx,
+                                          ssl_callback_SRPServerParams);
+        SSL_CTX_set_srp_cb_arg(mctx->ssl_ctx, mctx);
+    }
+#endif
+    return APR_SUCCESS;
+}
+#endif
+
+static apr_status_t ssl_init_ctx_protocol(server_rec *s,
+                                          apr_pool_t *p,
+                                          apr_pool_t *ptemp,
+                                          modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = NULL;
+    MODSSL_SSL_METHOD_CONST SSL_METHOD *method = NULL;
+    char *cp;
+    int protocol = mctx->protocol;
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+    int prot;
+#endif
+
+    /*
+     *  Create the new per-server SSL context
+     */
+    if (protocol == SSL_PROTOCOL_NONE) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02231)
+                "No SSL protocols available [hint: SSLProtocol]");
+        return ssl_die(s);
+    }
+
+    cp = apr_pstrcat(p,
+#ifndef OPENSSL_NO_SSL3
+                     (protocol & SSL_PROTOCOL_SSLV3 ? "SSLv3, " : ""),
+#endif
+                     (protocol & SSL_PROTOCOL_TLSV1 ? "TLSv1, " : ""),
+#ifdef HAVE_TLSV1_X
+                     (protocol & SSL_PROTOCOL_TLSV1_1 ? "TLSv1.1, " : ""),
+                     (protocol & SSL_PROTOCOL_TLSV1_2 ? "TLSv1.2, " : ""),
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+                     (protocol & SSL_PROTOCOL_TLSV1_3 ? "TLSv1.3, " : ""),
+#endif
+#endif
+                     NULL);
+    cp[strlen(cp)-2] = NUL;
+
+    ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
+                 "Creating new SSL context (protocols: %s)", cp);
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#ifndef OPENSSL_NO_SSL3
+    if (protocol == SSL_PROTOCOL_SSLV3) {
+        method = mctx->pkp ?
+            SSLv3_client_method() : /* proxy */
+            SSLv3_server_method();  /* server */
+    }
+    else
+#endif
+    if (protocol == SSL_PROTOCOL_TLSV1) {
+        method = mctx->pkp ?
+            TLSv1_client_method() : /* proxy */
+            TLSv1_server_method();  /* server */
+    }
+#ifdef HAVE_TLSV1_X
+    else if (protocol == SSL_PROTOCOL_TLSV1_1) {
+        method = mctx->pkp ?
+            TLSv1_1_client_method() : /* proxy */
+            TLSv1_1_server_method();  /* server */
+    }
+    else if (protocol == SSL_PROTOCOL_TLSV1_2) {
+        method = mctx->pkp ?
+            TLSv1_2_client_method() : /* proxy */
+            TLSv1_2_server_method();  /* server */
+    }
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    else if (protocol == SSL_PROTOCOL_TLSV1_3) {
+        method = mctx->pkp ?
+            TLSv1_3_client_method() : /* proxy */
+            TLSv1_3_server_method();  /* server */
+    }
+#endif
+#endif
+    else { /* For multiple protocols, we need a flexible method */
+        method = mctx->pkp ?
+            SSLv23_client_method() : /* proxy */
+            SSLv23_server_method();  /* server */
+    }
+#else
+    method = mctx->pkp ?
+        TLS_client_method() : /* proxy */
+        TLS_server_method();  /* server */
+#endif
+    ctx = SSL_CTX_new(method);
+
+    mctx->ssl_ctx = ctx;
+
+    SSL_CTX_set_options(ctx, SSL_OP_ALL);
+
+#if OPENSSL_VERSION_NUMBER < 0x10100000L  || \
+	(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x20800000L)
+    /* always disable SSLv2, as per RFC 6176 */
+    SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2);
+
+#ifndef OPENSSL_NO_SSL3
+    if (!(protocol & SSL_PROTOCOL_SSLV3)) {
+        SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3);
+    }
+#endif
+
+    if (!(protocol & SSL_PROTOCOL_TLSV1)) {
+        SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1);
+    }
+
+#ifdef HAVE_TLSV1_X
+    if (!(protocol & SSL_PROTOCOL_TLSV1_1)) {
+        SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_1);
+    }
+
+    if (!(protocol & SSL_PROTOCOL_TLSV1_2)) {
+        SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_2);
+    }
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    ssl_set_ctx_protocol_option(s, ctx, SSL_OP_NO_TLSv1_3,
+                                protocol & SSL_PROTOCOL_TLSV1_3, "TLSv1.3");
+#endif
+#endif
+
+#else /* #if OPENSSL_VERSION_NUMBER < 0x10100000L */
+    /* We first determine the maximum protocol version we should provide */
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    if (protocol & SSL_PROTOCOL_TLSV1_3) {
+        prot = TLS1_3_VERSION;
+    } else
+#endif
+    if (protocol & SSL_PROTOCOL_TLSV1_2) {
+        prot = TLS1_2_VERSION;
+    } else if (protocol & SSL_PROTOCOL_TLSV1_1) {
+        prot = TLS1_1_VERSION;
+    } else if (protocol & SSL_PROTOCOL_TLSV1) {
+        prot = TLS1_VERSION;
+#ifndef OPENSSL_NO_SSL3
+    } else if (protocol & SSL_PROTOCOL_SSLV3) {
+        prot = SSL3_VERSION;
+#endif
+    } else {
+        SSL_CTX_free(ctx);
+        mctx->ssl_ctx = NULL;
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(03378)
+                "No SSL protocols available [hint: SSLProtocol]");
+        return ssl_die(s);
+    }
+    SSL_CTX_set_max_proto_version(ctx, prot);
+
+    /* Next we scan for the minimal protocol version we should provide,
+     * but we do not allow holes between max and min */
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    if (prot == TLS1_3_VERSION && protocol & SSL_PROTOCOL_TLSV1_2) {
+        prot = TLS1_2_VERSION;
+    }
+#endif
+    if (prot == TLS1_2_VERSION && protocol & SSL_PROTOCOL_TLSV1_1) {
+        prot = TLS1_1_VERSION;
+    }
+    if (prot == TLS1_1_VERSION && protocol & SSL_PROTOCOL_TLSV1) {
+        prot = TLS1_VERSION;
+    }
+#ifndef OPENSSL_NO_SSL3
+    if (prot == TLS1_VERSION && protocol & SSL_PROTOCOL_SSLV3) {
+        prot = SSL3_VERSION;
+    }
+#endif
+    SSL_CTX_set_min_proto_version(ctx, prot);
+#endif /* if OPENSSL_VERSION_NUMBER < 0x10100000L */
+
+#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
+    if (sc->cipher_server_pref == TRUE) {
+        SSL_CTX_set_options(ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
+    }
+#endif
+
+
+#ifndef OPENSSL_NO_COMP
+    if (sc->compression != TRUE) {
+#ifdef SSL_OP_NO_COMPRESSION
+        /* OpenSSL >= 1.0 only */
+        SSL_CTX_set_options(ctx, SSL_OP_NO_COMPRESSION);
+#else
+        sk_SSL_COMP_zero(SSL_COMP_get_compression_methods());
+#endif
+    }
+#endif
+
+#ifdef SSL_OP_NO_TICKET
+    /*
+     * Configure using RFC 5077 TLS session tickets
+     * for session resumption.
+     */
+    if (sc->session_tickets == FALSE) {
+        SSL_CTX_set_options(ctx, SSL_OP_NO_TICKET);
+    }
+#endif
+
+#ifdef SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
+    if (sc->insecure_reneg == TRUE) {
+        SSL_CTX_set_options(ctx, SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION);
+    }
+#endif
+
+    SSL_CTX_set_app_data(ctx, s);
+
+    /*
+     * Configure additional context ingredients
+     */
+    SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
+#ifdef HAVE_ECC
+    SSL_CTX_set_options(ctx, SSL_OP_SINGLE_ECDH_USE);
+#endif
+
+#ifdef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
+    /*
+     * Disallow a session from being resumed during a renegotiation,
+     * so that an acceptable cipher suite can be negotiated.
+     */
+    SSL_CTX_set_options(ctx, SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
+#endif
+
+#ifdef SSL_MODE_RELEASE_BUFFERS
+    /* If httpd is configured to reduce mem usage, ask openssl to do so, too */
+    if (ap_max_mem_free != APR_ALLOCATOR_MAX_FREE_UNLIMITED)
+        SSL_CTX_set_mode(ctx, SSL_MODE_RELEASE_BUFFERS);
+#endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x1010100fL
+    /* For OpenSSL >=1.1.1, disable auto-retry mode so it's possible
+     * to consume handshake records without blocking for app-data.
+     * https://github.com/openssl/openssl/issues/7178 */
+    SSL_CTX_clear_mode(ctx, SSL_MODE_AUTO_RETRY);
+#endif
+
+#ifdef HAVE_OPENSSL_KEYLOG
+    if (mctx->sc->mc->keylog_file) {
+        SSL_CTX_set_keylog_callback(ctx, modssl_callback_keylog);
+    }
+#endif
+    
+    return APR_SUCCESS;
+}
+
+static void ssl_init_ctx_session_cache(server_rec *s,
+                                       apr_pool_t *p,
+                                       apr_pool_t *ptemp,
+                                       modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = mctx->ssl_ctx;
+    SSLModConfigRec *mc = myModConfig(s);
+
+    SSL_CTX_set_session_cache_mode(ctx, mc->sesscache_mode);
+
+    if (mc->sesscache) {
+        SSL_CTX_sess_set_new_cb(ctx,    ssl_callback_NewSessionCacheEntry);
+        SSL_CTX_sess_set_get_cb(ctx,    ssl_callback_GetSessionCacheEntry);
+        SSL_CTX_sess_set_remove_cb(ctx, ssl_callback_DelSessionCacheEntry);
+    }
+}
+
+static void ssl_init_ctx_callbacks(server_rec *s,
+                                   apr_pool_t *p,
+                                   apr_pool_t *ptemp,
+                                   modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = mctx->ssl_ctx;
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    /* Note that for OpenSSL>=1.1, auto selection is enabled via
+     * SSL_CTX_set_dh_auto(,1) if no parameter is configured. */
+    SSL_CTX_set_tmp_dh_callback(ctx,  ssl_callback_TmpDH);
+#endif
+
+    SSL_CTX_set_info_callback(ctx, ssl_callback_Info);
+
+#ifdef HAVE_TLS_ALPN
+    SSL_CTX_set_alpn_select_cb(ctx, ssl_callback_alpn_select, NULL);
+#endif
+}
+
+static APR_INLINE
+int modssl_CTX_load_verify_locations(SSL_CTX *ctx,
+                                     const char *file,
+                                     const char *path)
+{
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    if (!SSL_CTX_load_verify_locations(ctx, file, path))
+        return 0;
+#else
+    if (file && !SSL_CTX_load_verify_file(ctx, file))
+        return 0;
+    if (path && !SSL_CTX_load_verify_dir(ctx, path))
+        return 0;
+#endif
+    return 1;
+}
+
+static apr_status_t ssl_init_ctx_verify(server_rec *s,
+                                        apr_pool_t *p,
+                                        apr_pool_t *ptemp,
+                                        modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = mctx->ssl_ctx;
+
+    int verify = SSL_VERIFY_NONE;
+    STACK_OF(X509_NAME) *ca_list;
+
+    if (mctx->auth.verify_mode == SSL_CVERIFY_UNSET) {
+        mctx->auth.verify_mode = SSL_CVERIFY_NONE;
+    }
+
+    if (mctx->auth.verify_depth == UNSET) {
+        mctx->auth.verify_depth = 1;
+    }
+
+    /*
+     *  Configure callbacks for SSL context
+     */
+    if (mctx->auth.verify_mode == SSL_CVERIFY_REQUIRE) {
+        verify |= SSL_VERIFY_PEER_STRICT;
+    }
+
+    if ((mctx->auth.verify_mode == SSL_CVERIFY_OPTIONAL) ||
+        (mctx->auth.verify_mode == SSL_CVERIFY_OPTIONAL_NO_CA))
+    {
+        verify |= SSL_VERIFY_PEER;
+    }
+
+    SSL_CTX_set_verify(ctx, verify, ssl_callback_SSLVerify);
+
+    /*
+     * Configure Client Authentication details
+     */
+    if (mctx->auth.ca_cert_file || mctx->auth.ca_cert_path) {
+        ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s,
+                     "Configuring client authentication");
+
+        if (!modssl_CTX_load_verify_locations(ctx, mctx->auth.ca_cert_file,
+                                                   mctx->auth.ca_cert_path)) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01895)
+                    "Unable to configure verify locations "
+                    "for client authentication");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+
+        if (mctx->pks && (mctx->pks->ca_name_file || mctx->pks->ca_name_path)) {
+            ca_list = ssl_init_FindCAList(s, ptemp,
+                                          mctx->pks->ca_name_file,
+                                          mctx->pks->ca_name_path);
+        } else
+            ca_list = ssl_init_FindCAList(s, ptemp,
+                                          mctx->auth.ca_cert_file,
+                                          mctx->auth.ca_cert_path);
+        if (sk_X509_NAME_num(ca_list) <= 0) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01896)
+                    "Unable to determine list of acceptable "
+                    "CA certificates for client authentication");
+            return ssl_die(s);
+        }
+
+        SSL_CTX_set_client_CA_list(ctx, ca_list);
+    }
+
+    /*
+     * Give a warning when no CAs were configured but client authentication
+     * should take place. This cannot work.
+     */
+    if (mctx->auth.verify_mode == SSL_CVERIFY_REQUIRE) {
+        ca_list = SSL_CTX_get_client_CA_list(ctx);
+
+        if (sk_X509_NAME_num(ca_list) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01897)
+                         "Init: Oops, you want to request client "
+                         "authentication, but no CAs are known for "
+                         "verification!?  [Hint: SSLCACertificate*]");
+        }
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_init_ctx_cipher_suite(server_rec *s,
+                                              apr_pool_t *p,
+                                              apr_pool_t *ptemp,
+                                              modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = mctx->ssl_ctx;
+    const char *suite;
+
+    /*
+     *  Configure SSL Cipher Suite. Always disable NULL and export ciphers,
+     *  see also ssl_engine_config.c:ssl_cmd_SSLCipherSuite().
+     *  OpenSSL's SSL_DEFAULT_CIPHER_LIST includes !aNULL:!eNULL from 0.9.8f,
+     *  and !EXP from 0.9.8zf/1.0.1m/1.0.2a, so append them while we support
+     *  earlier versions.
+     */
+    suite = mctx->auth.cipher_suite ? mctx->auth.cipher_suite :
+            apr_pstrcat(ptemp, SSL_DEFAULT_CIPHER_LIST, ":!aNULL:!eNULL:!EXP",
+                        NULL);
+
+    ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s,
+                 "Configuring permitted SSL ciphers [%s]",
+                 suite);
+
+    if (!SSL_CTX_set_cipher_list(ctx, suite)) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01898)
+                "Unable to configure permitted SSL ciphers");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    if (mctx->auth.tls13_ciphers 
+        && !SSL_CTX_set_ciphersuites(ctx, mctx->auth.tls13_ciphers)) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10127)
+                "Unable to configure permitted TLSv1.3 ciphers");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+#endif
+    return APR_SUCCESS;
+}
+
+static APR_INLINE
+int modssl_X509_STORE_load_locations(X509_STORE *store,
+                                     const char *file,
+                                     const char *path)
+{
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    if (!X509_STORE_load_locations(store, file, path))
+        return 0;
+#else
+    if (file && !X509_STORE_load_file(store, file))
+        return 0;
+    if (path && !X509_STORE_load_path(store, path))
+        return 0;
+#endif
+    return 1;
+}
+
+static apr_status_t ssl_init_ctx_crl(server_rec *s,
+                                     apr_pool_t *p,
+                                     apr_pool_t *ptemp,
+                                     modssl_ctx_t *mctx)
+{
+    X509_STORE *store = SSL_CTX_get_cert_store(mctx->ssl_ctx);
+    unsigned long crlflags = 0;
+    char *cfgp = mctx->pkp ? "SSLProxy" : "SSL";
+    int crl_check_mode;
+
+    if (mctx->ocsp_mask == UNSET) {
+        mctx->ocsp_mask = SSL_OCSPCHECK_NONE;
+    }
+
+    if (mctx->crl_check_mask == UNSET) {
+        mctx->crl_check_mask = SSL_CRLCHECK_NONE;
+    }
+    crl_check_mode = mctx->crl_check_mask & ~SSL_CRLCHECK_FLAGS;
+
+    /*
+     * Configure Certificate Revocation List (CRL) Details
+     */
+
+    if (!(mctx->crl_file || mctx->crl_path)) {
+        if (crl_check_mode == SSL_CRLCHECK_LEAF ||
+            crl_check_mode == SSL_CRLCHECK_CHAIN) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01899)
+                         "Host %s: CRL checking has been enabled, but "
+                         "neither %sCARevocationFile nor %sCARevocationPath "
+                         "is configured", mctx->sc->vhost_id, cfgp, cfgp);
+            return ssl_die(s);
+        }
+        return APR_SUCCESS;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01900)
+                 "Configuring certificate revocation facility");
+
+    if (!store || !modssl_X509_STORE_load_locations(store, mctx->crl_file,
+                                                           mctx->crl_path)) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01901)
+                     "Host %s: unable to configure X.509 CRL storage "
+                     "for certificate revocation", mctx->sc->vhost_id);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    switch (crl_check_mode) {
+       case SSL_CRLCHECK_LEAF:
+           crlflags = X509_V_FLAG_CRL_CHECK;
+           break;
+       case SSL_CRLCHECK_CHAIN:
+           crlflags = X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL;
+           break;
+       default:
+           crlflags = 0;
+    }
+
+    if (crlflags) {
+        X509_STORE_set_flags(store, crlflags);
+    } else {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01902)
+                     "Host %s: X.509 CRL storage locations configured, "
+                     "but CRL checking (%sCARevocationCheck) is not "
+                     "enabled", mctx->sc->vhost_id, cfgp);
+    }
+
+    return APR_SUCCESS;
+}
+
+/*
+ * Read a file that optionally contains the server certificate in PEM
+ * format, possibly followed by a sequence of CA certificates that
+ * should be sent to the peer in the SSL Certificate message.
+ */
+static int use_certificate_chain(
+    SSL_CTX *ctx, char *file, int skipfirst, pem_password_cb *cb)
+{
+    BIO *bio;
+    X509 *x509;
+    unsigned long err;
+    int n;
+
+    if ((bio = BIO_new(BIO_s_file())) == NULL)
+        return -1;
+    if (BIO_read_filename(bio, file) <= 0) {
+        BIO_free(bio);
+        return -1;
+    }
+    /* optionally skip a leading server certificate */
+    if (skipfirst) {
+        if ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) == NULL) {
+            BIO_free(bio);
+            return -1;
+        }
+        X509_free(x509);
+    }
+    /* free a perhaps already configured extra chain */
+#ifdef OPENSSL_NO_SSL_INTERN
+    SSL_CTX_clear_extra_chain_certs(ctx);
+#else
+    if (ctx->extra_certs != NULL) {
+        sk_X509_pop_free((STACK_OF(X509) *)ctx->extra_certs, X509_free);
+        ctx->extra_certs = NULL;
+    }
+#endif
+
+    /* create new extra chain by loading the certs */
+    n = 0;
+    ERR_clear_error();
+    while ((x509 = PEM_read_bio_X509(bio, NULL, cb, NULL)) != NULL) {
+        if (!SSL_CTX_add_extra_chain_cert(ctx, x509)) {
+            X509_free(x509);
+            BIO_free(bio);
+            return -1;
+        }
+        n++;
+    }
+    /* Make sure that only the error is just an EOF */
+    if ((err = ERR_peek_error()) > 0) {
+        if (!(   ERR_GET_LIB(err) == ERR_LIB_PEM
+              && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
+            BIO_free(bio);
+            return -1;
+        }
+        while (ERR_get_error() > 0) ;
+    }
+    BIO_free(bio);
+    return n;
+}
+
+static apr_status_t ssl_init_ctx_cert_chain(server_rec *s,
+                                            apr_pool_t *p,
+                                            apr_pool_t *ptemp,
+                                            modssl_ctx_t *mctx)
+{
+    BOOL skip_first = FALSE;
+    int i, n;
+    const char *chain = mctx->cert_chain;
+
+    /*
+     * Optionally configure extra server certificate chain certificates.
+     * This is usually done by OpenSSL automatically when one of the
+     * server cert issuers are found under SSLCACertificatePath or in
+     * SSLCACertificateFile. But because these are intended for client
+     * authentication it can conflict. For instance when you use a
+     * Global ID server certificate you've to send out the intermediate
+     * CA certificate, too. When you would just configure this with
+     * SSLCACertificateFile and also use client authentication mod_ssl
+     * would accept all clients also issued by this CA. Obviously this
+     * isn't what we want in this situation. So this feature here exists
+     * to allow one to explicitly configure CA certificates which are
+     * used only for the server certificate chain.
+     */
+    if (!chain) {
+        return APR_SUCCESS;
+    }
+
+    for (i = 0; (i < mctx->pks->cert_files->nelts) &&
+         APR_ARRAY_IDX(mctx->pks->cert_files, i, const char *); i++) {
+        if (strEQ(APR_ARRAY_IDX(mctx->pks->cert_files, i, const char *), chain)) {
+            skip_first = TRUE;
+            break;
+        }
+    }
+
+    n = use_certificate_chain(mctx->ssl_ctx, (char *)chain, skip_first, NULL);
+    if (n < 0) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01903)
+                "Failed to configure CA certificate chain!");
+        return ssl_die(s);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01904)
+                 "Configuring server certificate chain "
+                 "(%d CA certificate%s)",
+                 n, n == 1 ? "" : "s");
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_init_ctx(server_rec *s,
+                                 apr_pool_t *p,
+                                 apr_pool_t *ptemp,
+                                 modssl_ctx_t *mctx)
+{
+    apr_status_t rv;
+
+    if ((rv = ssl_init_ctx_protocol(s, p, ptemp, mctx)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    ssl_init_ctx_session_cache(s, p, ptemp, mctx);
+
+    ssl_init_ctx_callbacks(s, p, ptemp, mctx);
+
+    if ((rv = ssl_init_ctx_verify(s, p, ptemp, mctx)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    if ((rv = ssl_init_ctx_cipher_suite(s, p, ptemp, mctx)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    if ((rv = ssl_init_ctx_crl(s, p, ptemp, mctx)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    if (mctx->pks) {
+        /* XXX: proxy support? */
+        if ((rv = ssl_init_ctx_cert_chain(s, p, ptemp, mctx)) != APR_SUCCESS) {
+            return rv;
+        }
+#ifdef HAVE_TLSEXT
+        if ((rv = ssl_init_ctx_tls_extensions(s, p, ptemp, mctx)) !=
+            APR_SUCCESS) {
+            return rv;
+        }
+#endif
+    }
+
+    return APR_SUCCESS;
+}
+
+static void ssl_check_public_cert(server_rec *s,
+                                  apr_pool_t *ptemp,
+                                  X509 *cert,
+                                  const char *key_id)
+{
+    int is_ca, pathlen;
+
+    if (!cert) {
+        return;
+    }
+
+    /*
+     * Some information about the certificate(s)
+     */
+
+    if (modssl_X509_getBC(cert, &is_ca, &pathlen)) {
+        if (is_ca) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01906)
+                         "%s server certificate is a CA certificate "
+                         "(BasicConstraints: CA == TRUE !?)", key_id);
+        }
+
+        if (pathlen > 0) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01907)
+                         "%s server certificate is not a leaf certificate "
+                         "(BasicConstraints: pathlen == %d > 0 !?)",
+                         key_id, pathlen);
+        }
+    }
+
+    if (modssl_X509_match_name(ptemp, cert, (const char *)s->server_hostname,
+                               TRUE, s) == FALSE) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01909)
+                     "%s server certificate does NOT include an ID "
+                     "which matches the server name", key_id);
+    }
+}
+
+/* prevent OpenSSL from showing its "Enter PEM pass phrase:" prompt */
+static int ssl_no_passwd_prompt_cb(char *buf, int size, int rwflag,
+                                   void *userdata) {
+   return 0;
+}
+
+static APR_INLINE int modssl_DH_bits(DH *dh)
+{
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    return DH_bits(dh);
+#else
+    return BN_num_bits(DH_get0_p(dh));
+#endif
+}
+
+/* SSL_CTX_use_PrivateKey_file() can fail either because the private
+ * key was encrypted, or due to a mismatch between an already-loaded
+ * cert and the key - a common misconfiguration - from calling
+ * X509_check_private_key().  This macro is passed the last error code
+ * off the OpenSSL stack and evaluates to true only for the first
+ * case.  With OpenSSL < 3 the second case is identifiable by the
+ * function code, but function codes are not used from 3.0. */
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+#define CHECK_PRIVKEY_ERROR(ec) (ERR_GET_FUNC(ec) != X509_F_X509_CHECK_PRIVATE_KEY)
+#else
+#define CHECK_PRIVKEY_ERROR(ec) (ERR_GET_LIB(ec) != ERR_LIB_X509            \
+                                 || (ERR_GET_REASON(ec) != X509_R_KEY_TYPE_MISMATCH \
+                                     && ERR_GET_REASON(ec) != X509_R_KEY_VALUES_MISMATCH \
+                                     && ERR_GET_REASON(ec) != X509_R_UNKNOWN_KEY_TYPE))
+#endif
+
+static apr_status_t ssl_init_server_certs(server_rec *s,
+                                          apr_pool_t *p,
+                                          apr_pool_t *ptemp,
+                                          modssl_ctx_t *mctx,
+                                          apr_array_header_t *pphrases)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    const char *vhost_id = mctx->sc->vhost_id, *key_id, *certfile, *keyfile;
+    int i;
+    X509 *cert;
+    DH *dh;
+#ifdef HAVE_ECC
+    EC_GROUP *ecparams = NULL;
+    int nid;
+    EC_KEY *eckey = NULL;
+#endif
+#ifndef HAVE_SSL_CONF_CMD
+    SSL *ssl;
+#endif
+
+    /* no OpenSSL default prompts for any of the SSL_CTX_use_* calls, please */
+    SSL_CTX_set_default_passwd_cb(mctx->ssl_ctx, ssl_no_passwd_prompt_cb);
+
+    /* Iterate over the SSLCertificateFile array */
+    for (i = 0; (i < mctx->pks->cert_files->nelts) &&
+                (certfile = APR_ARRAY_IDX(mctx->pks->cert_files, i,
+                                          const char *));
+         i++) {
+        EVP_PKEY *pkey;
+        const char *engine_certfile = NULL;
+
+        key_id = apr_psprintf(ptemp, "%s:%d", vhost_id, i);
+
+        ERR_clear_error();
+
+        /* first the certificate (public key) */
+        if (modssl_is_engine_id(certfile)) {
+            engine_certfile = certfile;
+        }
+        else if (mctx->cert_chain) {
+            if ((SSL_CTX_use_certificate_file(mctx->ssl_ctx, certfile,
+                                              SSL_FILETYPE_PEM) < 1)) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02561)
+                             "Failed to configure certificate %s, check %s",
+                             key_id, certfile);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                return APR_EGENERAL;
+            }
+        } else {
+            if ((SSL_CTX_use_certificate_chain_file(mctx->ssl_ctx,
+                                                    certfile) < 1)) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02562)
+                             "Failed to configure certificate %s (with chain),"
+                             " check %s", key_id, certfile);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                return APR_EGENERAL;
+            }
+        }
+
+        /* and second, the private key */
+        if (i < mctx->pks->key_files->nelts) {
+            keyfile = APR_ARRAY_IDX(mctx->pks->key_files, i, const char *);
+        } else {
+            keyfile = certfile;
+        }
+
+        ERR_clear_error();
+
+        if (modssl_is_engine_id(keyfile)) {
+            apr_status_t rv;
+
+            cert = NULL;
+            
+            if ((rv = modssl_load_engine_keypair(s, ptemp, vhost_id,
+                                                 engine_certfile, keyfile,
+                                                 &cert, &pkey))) {
+                return rv;
+            }
+
+            if (cert) {
+                if (SSL_CTX_use_certificate(mctx->ssl_ctx, cert) < 1) {
+                    ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10137)
+                                 "Failed to configure engine certificate %s, check %s",
+                                 key_id, certfile);
+                    ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                    return APR_EGENERAL;
+                }
+
+                /* SSL_CTX now owns the cert. */
+                X509_free(cert);
+            }                    
+            
+            if (SSL_CTX_use_PrivateKey(mctx->ssl_ctx, pkey) < 1) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10130)
+                             "Failed to configure private key %s from engine",
+                             keyfile);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                return APR_EGENERAL;
+            }
+
+            /* SSL_CTX now owns the key */
+            EVP_PKEY_free(pkey);
+        }
+        else if ((SSL_CTX_use_PrivateKey_file(mctx->ssl_ctx, keyfile,
+                                              SSL_FILETYPE_PEM) < 1)
+                 && CHECK_PRIVKEY_ERROR(ERR_peek_last_error())) {
+            ssl_asn1_t *asn1;
+            const unsigned char *ptr;
+
+            ERR_clear_error();
+
+            /* perhaps it's an encrypted private key, so try again */
+            ssl_load_encrypted_pkey(s, ptemp, i, keyfile, &pphrases);
+
+            if (!(asn1 = ssl_asn1_table_get(mc->tPrivateKey, key_id)) ||
+                !(ptr = asn1->cpData) ||
+                !(pkey = d2i_AutoPrivateKey(NULL, &ptr, asn1->nData)) ||
+                (SSL_CTX_use_PrivateKey(mctx->ssl_ctx, pkey) < 1)) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02564)
+                             "Failed to configure encrypted (?) private key %s,"
+                             " check %s", key_id, keyfile);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                return APR_EGENERAL;
+            }
+        }
+
+        if (SSL_CTX_check_private_key(mctx->ssl_ctx) < 1) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02565)
+                         "Certificate and private key %s from %s and %s "
+                         "do not match", key_id, certfile, keyfile);
+            return APR_EGENERAL;
+        }
+
+#ifdef HAVE_SSL_CONF_CMD
+        /* 
+         * workaround for those OpenSSL versions where SSL_CTX_get0_certificate
+         * is not yet available: create an SSL struct which we dispose of
+         * as soon as we no longer need access to the cert. (Strictly speaking,
+         * SSL_CTX_get0_certificate does not depend on the SSL_CONF stuff,
+         * but there's no reliable way to check for its existence, so we
+         * assume that if SSL_CONF is available, it's OpenSSL 1.0.2 or later,
+         * and SSL_CTX_get0_certificate is implemented.)
+         */
+        if (!(cert = SSL_CTX_get0_certificate(mctx->ssl_ctx))) {
+#else
+        ssl = SSL_new(mctx->ssl_ctx);
+        if (ssl) {
+            /* Workaround bug in SSL_get_certificate in OpenSSL 0.9.8y */
+            SSL_set_connect_state(ssl);
+            cert = SSL_get_certificate(ssl);
+        }
+        if (!ssl || !cert) {
+#endif
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02566)
+                         "Unable to retrieve certificate %s", key_id);
+#ifndef HAVE_SSL_CONF_CMD
+            if (ssl)
+                SSL_free(ssl);
+#endif
+            return APR_EGENERAL;
+        }
+
+        /* warn about potential cert issues */
+        ssl_check_public_cert(s, ptemp, cert, key_id);
+
+#if defined(HAVE_OCSP_STAPLING) && !defined(SSL_CTRL_SET_CURRENT_CERT)
+        /* 
+         * OpenSSL up to 1.0.1: configure stapling as we go. In 1.0.2
+         * and later, there's SSL_CTX_set_current_cert, which allows
+         * iterating over all certs in an SSL_CTX (including those possibly
+         * loaded via SSLOpenSSLConfCmd Certificate), so for 1.0.2 and
+         * later, we defer to the code in ssl_init_server_ctx.
+         */
+        if (!ssl_stapling_init_cert(s, p, ptemp, mctx, cert)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02567)
+                         "Unable to configure certificate %s for stapling",
+                         key_id);
+        }
+#endif
+
+#ifndef HAVE_SSL_CONF_CMD
+        SSL_free(ssl);
+#endif
+
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02568)
+                     "Certificate and private key %s configured from %s and %s",
+                     key_id, certfile, keyfile);
+    }
+
+    /*
+     * Try to read DH parameters from the (first) SSLCertificateFile
+     */
+    certfile = APR_ARRAY_IDX(mctx->pks->cert_files, 0, const char *);
+    if (certfile && !modssl_is_engine_id(certfile)
+        && (dh = ssl_dh_GetParamFromFile(certfile))) {
+        /* ### This should be replaced with SSL_CTX_set0_tmp_dh_pkey()
+         * for OpenSSL 3.0+. */
+        SSL_CTX_set_tmp_dh(mctx->ssl_ctx, dh);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02540)
+                     "Custom DH parameters (%d bits) for %s loaded from %s",
+                     modssl_DH_bits(dh), vhost_id, certfile);
+        DH_free(dh);
+    }
+#if !MODSSL_USE_OPENSSL_PRE_1_1_API
+    else {
+        /* If no parameter is manually configured, enable auto
+         * selection. */
+        SSL_CTX_set_dh_auto(mctx->ssl_ctx, 1);
+    }
+#endif
+
+#ifdef HAVE_ECC
+    /*
+     * Similarly, try to read the ECDH curve name from SSLCertificateFile...
+     */
+    if (certfile && !modssl_is_engine_id(certfile)
+        && (ecparams = ssl_ec_GetParamFromFile(certfile))
+        && (nid = EC_GROUP_get_curve_name(ecparams)) 
+        && (eckey = EC_KEY_new_by_curve_name(nid))) {
+        SSL_CTX_set_tmp_ecdh(mctx->ssl_ctx, eckey);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02541)
+                     "ECDH curve %s for %s specified in %s",
+                     OBJ_nid2sn(nid), vhost_id, certfile);
+    }
+    /*
+     * ...otherwise, enable auto curve selection (OpenSSL 1.0.2)
+     * or configure NIST P-256 (required to enable ECDHE for earlier versions)
+     * ECDH is always enabled in 1.1.0 unless excluded from SSLCipherList
+     */
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    else {
+#if defined(SSL_CTX_set_ecdh_auto)
+        SSL_CTX_set_ecdh_auto(mctx->ssl_ctx, 1);
+#else
+        eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
+        SSL_CTX_set_tmp_ecdh(mctx->ssl_ctx, eckey);
+#endif
+    }
+#endif
+    /* OpenSSL assures us that _free() is NULL-safe */
+    EC_KEY_free(eckey);
+    EC_GROUP_free(ecparams);
+#endif
+
+    return APR_SUCCESS;
+}
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+static apr_status_t ssl_init_ticket_key(server_rec *s,
+                                        apr_pool_t *p,
+                                        apr_pool_t *ptemp,
+                                        modssl_ctx_t *mctx)
+{
+    apr_status_t rv;
+    apr_file_t *fp;
+    apr_size_t len;
+    char buf[TLSEXT_TICKET_KEY_LEN];
+    char *path;
+    modssl_ticket_key_t *ticket_key = mctx->ticket_key;
+    int res;
+
+    if (!ticket_key->file_path) {
+        return APR_SUCCESS;
+    }
+
+    path = ap_server_root_relative(p, ticket_key->file_path);
+
+    rv = apr_file_open(&fp, path, APR_READ|APR_BINARY,
+                       APR_OS_DEFAULT, ptemp);
+
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02286)
+                     "Failed to open ticket key file %s: (%d) %pm",
+                     path, rv, &rv);
+        return ssl_die(s);
+    }
+
+    rv = apr_file_read_full(fp, &buf[0], TLSEXT_TICKET_KEY_LEN, &len);
+
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02287)
+                     "Failed to read %d bytes from %s: (%d) %pm",
+                     TLSEXT_TICKET_KEY_LEN, path, rv, &rv);
+        return ssl_die(s);
+    }
+
+    memcpy(ticket_key->key_name, buf, 16);
+    memcpy(ticket_key->aes_key, buf + 32, 16);
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    memcpy(ticket_key->hmac_secret, buf + 16, 16);
+    res = SSL_CTX_set_tlsext_ticket_key_cb(mctx->ssl_ctx,
+                                           ssl_callback_SessionTicket);
+#else
+    ticket_key->mac_params[0] =
+        OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, buf + 16, 16);
+    ticket_key->mac_params[1] =
+        OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, "sha256", 0);
+    ticket_key->mac_params[2] =
+        OSSL_PARAM_construct_end();
+    res = SSL_CTX_set_tlsext_ticket_key_evp_cb(mctx->ssl_ctx,
+                                               ssl_callback_SessionTicket);
+#endif
+    if (!res) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01913)
+                     "Unable to initialize TLS session ticket key callback "
+                     "(incompatible OpenSSL version?)");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02288)
+                 "TLS session ticket key for %s successfully loaded from %s",
+                 (mySrvConfig(s))->vhost_id, path);
+
+    return APR_SUCCESS;
+}
+#endif
+
+static BOOL load_x509_info(apr_pool_t *ptemp,
+                           STACK_OF(X509_INFO) *sk,
+                           const char *filename)
+{
+    BIO *in;
+
+    if (!(in = BIO_new(BIO_s_file()))) {
+        return FALSE;
+    }
+
+    if (BIO_read_filename(in, filename) <= 0) {
+        BIO_free(in);
+        return FALSE;
+    }
+
+    ERR_clear_error();
+
+    PEM_X509_INFO_read_bio(in, sk, NULL, NULL);
+
+    BIO_free(in);
+
+    return TRUE;
+}
+
+static apr_status_t ssl_init_proxy_certs(server_rec *s,
+                                         apr_pool_t *p,
+                                         apr_pool_t *ptemp,
+                                         modssl_ctx_t *mctx)
+{
+    int n, ncerts = 0;
+    STACK_OF(X509_INFO) *sk;
+    modssl_pk_proxy_t *pkp = mctx->pkp;
+    STACK_OF(X509) *chain;
+    X509_STORE_CTX *sctx;
+    X509_STORE *store = SSL_CTX_get_cert_store(mctx->ssl_ctx);
+
+#if OPENSSL_VERSION_NUMBER >= 0x1010100fL
+    /* For OpenSSL >=1.1.1, turn on client cert support which is
+     * otherwise turned off by default (by design).
+     * https://github.com/openssl/openssl/issues/6933 */
+    SSL_CTX_set_post_handshake_auth(mctx->ssl_ctx, 1);
+#endif
+    
+    SSL_CTX_set_client_cert_cb(mctx->ssl_ctx,
+                               ssl_callback_proxy_cert);
+
+    if (!(pkp->cert_file || pkp->cert_path)) {
+        return APR_SUCCESS;
+    }
+
+    sk = sk_X509_INFO_new_null();
+
+    if (pkp->cert_file) {
+        load_x509_info(ptemp, sk, pkp->cert_file);
+    }
+
+    if (pkp->cert_path) {
+        ssl_init_ca_cert_path(s, ptemp, pkp->cert_path, NULL, sk);
+    }
+
+    if ((ncerts = sk_X509_INFO_num(sk)) <= 0) {
+        sk_X509_INFO_free(sk);
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(02206)
+                     "no client certs found for SSL proxy");
+        return APR_SUCCESS;
+    }
+
+    /* Check that all client certs have got certificates and private
+     * keys. */
+    for (n = 0; n < ncerts; n++) {
+        X509_INFO *inf = sk_X509_INFO_value(sk, n);
+
+        if (!inf->x509 || !inf->x_pkey || !inf->x_pkey->dec_pkey ||
+            inf->enc_data) {
+            sk_X509_INFO_free(sk);
+            ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, s, APLOGNO(02252)
+                         "incomplete client cert configured for SSL proxy "
+                         "(missing or encrypted private key?)");
+            return ssl_die(s);
+        }
+        
+        if (X509_check_private_key(inf->x509, inf->x_pkey->dec_pkey) != 1) {
+            ssl_log_xerror(SSLLOG_MARK, APLOG_STARTUP, 0, ptemp, s, inf->x509,
+                           APLOGNO(02326) "proxy client certificate and "
+                           "private key do not match");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+            return ssl_die(s);
+        }
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02207)
+                 "loaded %d client certs for SSL proxy",
+                 ncerts);
+    pkp->certs = sk;
+
+
+    if (!pkp->ca_cert_file || !store) {
+        return APR_SUCCESS;
+    }
+
+    /* If SSLProxyMachineCertificateChainFile is configured, load all
+     * the CA certs and have OpenSSL attempt to construct a full chain
+     * from each configured end-entity cert up to a root.  This will
+     * allow selection of the correct cert given a list of root CA
+     * names in the certificate request from the server.  */
+    pkp->ca_certs = (STACK_OF(X509) **) apr_pcalloc(p, ncerts * sizeof(sk));
+    sctx = X509_STORE_CTX_new();
+
+    if (!sctx) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02208)
+                     "SSL proxy client cert initialization failed");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    modssl_X509_STORE_load_locations(store, pkp->ca_cert_file, NULL);
+
+    for (n = 0; n < ncerts; n++) {
+        int i;
+
+        X509_INFO *inf = sk_X509_INFO_value(pkp->certs, n);
+        X509_STORE_CTX_init(sctx, store, inf->x509, NULL);
+
+        /* Attempt to verify the client cert */
+        if (X509_verify_cert(sctx) != 1) {
+            int err = X509_STORE_CTX_get_error(sctx);
+            ssl_log_xerror(SSLLOG_MARK, APLOG_WARNING, 0, ptemp, s, inf->x509,
+                           APLOGNO(02270) "SSL proxy client cert chain "
+                           "verification failed: %s :",
+                           X509_verify_cert_error_string(err));
+        }
+
+        /* Clear X509_verify_cert errors */
+        ERR_clear_error();
+
+        /* Obtain a copy of the verified chain */
+        chain = X509_STORE_CTX_get1_chain(sctx);
+
+        if (chain != NULL) {
+            /* Discard end entity cert from the chain */
+            X509_free(sk_X509_shift(chain));
+
+            if ((i = sk_X509_num(chain)) > 0) {
+                /* Store the chain for later use */
+                pkp->ca_certs[n] = chain;
+            }
+            else {
+                /* Discard empty chain */
+                sk_X509_pop_free(chain, X509_free);
+                pkp->ca_certs[n] = NULL;
+            }
+
+            ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, ptemp, s, inf->x509,
+                           APLOGNO(02271)
+                           "loaded %i intermediate CA%s for cert %i: ",
+                           i, i == 1 ? "" : "s", n);
+            if (i > 0) {
+                int j;
+                for (j = 0; j < i; j++) {
+                    ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, ptemp, s,
+                                   sk_X509_value(chain, j), APLOGNO(03039)
+                                   "%i:", j);
+                }
+            }
+        }
+
+        /* get ready for next X509_STORE_CTX_init */
+        X509_STORE_CTX_cleanup(sctx);
+    }
+
+    X509_STORE_CTX_free(sctx);
+
+    return APR_SUCCESS;
+}
+
+#define MODSSL_CFG_ITEM_FREE(func, item) \
+    if (item) { \
+        func(item); \
+        item = NULL; \
+    }
+
+static void ssl_init_ctx_cleanup(modssl_ctx_t *mctx)
+{
+    MODSSL_CFG_ITEM_FREE(SSL_CTX_free, mctx->ssl_ctx);
+
+#ifdef HAVE_SRP
+    if (mctx->srp_vbase != NULL) {
+        SRP_VBASE_free(mctx->srp_vbase);
+        mctx->srp_vbase = NULL;
+    }
+#endif
+}
+
+static apr_status_t ssl_cleanup_proxy_ctx(void *data)
+{
+    modssl_ctx_t *mctx = data;
+
+    ssl_init_ctx_cleanup(mctx);
+
+    if (mctx->pkp->certs) {
+        int i = 0;
+        int ncerts = sk_X509_INFO_num(mctx->pkp->certs);
+
+        if (mctx->pkp->ca_certs) {
+            for (i = 0; i < ncerts; i++) {
+                if (mctx->pkp->ca_certs[i] != NULL) {
+                    sk_X509_pop_free(mctx->pkp->ca_certs[i], X509_free);
+                }
+            }
+        }
+
+        sk_X509_INFO_pop_free(mctx->pkp->certs, X509_INFO_free);
+        mctx->pkp->certs = NULL;
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_init_proxy_ctx(server_rec *s,
+                                       apr_pool_t *p,
+                                       apr_pool_t *ptemp,
+                                       modssl_ctx_t *proxy)
+{
+    apr_status_t rv;
+
+    if (proxy->ssl_ctx) {
+        /* Merged/initialized already */
+        return APR_SUCCESS;
+    }
+
+    apr_pool_cleanup_register(p, proxy,
+                              ssl_cleanup_proxy_ctx,
+                              apr_pool_cleanup_null);
+
+    if ((rv = ssl_init_ctx(s, p, ptemp, proxy)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    if ((rv = ssl_init_proxy_certs(s, p, ptemp, proxy)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_init_server_ctx(server_rec *s,
+                                        apr_pool_t *p,
+                                        apr_pool_t *ptemp,
+                                        SSLSrvConfigRec *sc,
+                                        apr_array_header_t *pphrases)
+{
+    apr_status_t rv;
+    modssl_pk_server_t *pks;
+#ifdef HAVE_SSL_CONF_CMD
+    ssl_ctx_param_t *param = (ssl_ctx_param_t *)sc->server->ssl_ctx_param->elts;
+    SSL_CONF_CTX *cctx = sc->server->ssl_ctx_config;
+    int i;
+#endif
+    int n;
+
+    /*
+     *  Check for problematic re-initializations
+     */
+    if (sc->server->ssl_ctx) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02569)
+                     "Illegal attempt to re-initialise SSL for server "
+                     "(SSLEngine On should go in the VirtualHost, not in global scope.)");
+        return APR_EGENERAL;
+    }
+
+    /* Allow others to provide certificate files */
+    pks = sc->server->pks;
+    n = pks->cert_files->nelts;
+    ap_ssl_add_cert_files(s, p, pks->cert_files, pks->key_files);
+    ssl_run_add_cert_files(s, p, pks->cert_files, pks->key_files);
+
+    if (apr_is_empty_array(pks->cert_files)) {
+        /* does someone propose a certiciate to fall back on here? */
+        ap_ssl_add_fallback_cert_files(s, p, pks->cert_files, pks->key_files);
+        ssl_run_add_fallback_cert_files(s, p, pks->cert_files, pks->key_files);
+        if (n < pks->cert_files->nelts) {
+            pks->service_unavailable = 1;
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10085)
+                         "Init: %s will respond with '503 Service Unavailable' for now. There "
+                         "are no SSL certificates configured and no other module contributed any.",
+                         ssl_util_vhostid(p, s));
+        }
+    }
+    
+    if (n < pks->cert_files->nelts) {
+        /* additionally installed certs overrides any old chain configuration */
+        sc->server->cert_chain = NULL;
+    }
+    
+    if ((rv = ssl_init_ctx(s, p, ptemp, sc->server)) != APR_SUCCESS) {
+        return rv;
+    }
+
+    if ((rv = ssl_init_server_certs(s, p, ptemp, sc->server, pphrases))
+        != APR_SUCCESS) {
+        return rv;
+    }
+
+#ifdef HAVE_SSL_CONF_CMD
+    SSL_CONF_CTX_set_ssl_ctx(cctx, sc->server->ssl_ctx);
+    for (i = 0; i < sc->server->ssl_ctx_param->nelts; i++, param++) {
+        ERR_clear_error();
+        if (SSL_CONF_cmd(cctx, param->name, param->value) <= 0) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02407)
+                         "\"SSLOpenSSLConfCmd %s %s\" failed for %s",
+                         param->name, param->value, sc->vhost_id);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        } else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02556)
+                         "\"SSLOpenSSLConfCmd %s %s\" applied to %s",
+                         param->name, param->value, sc->vhost_id);
+        }
+    }
+
+    if (SSL_CONF_CTX_finish(cctx) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02547)
+                         "SSL_CONF_CTX_finish() failed");
+            SSL_CONF_CTX_free(cctx);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+    }
+#endif
+
+    if (SSL_CTX_check_private_key(sc->server->ssl_ctx) != 1) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02572)
+                     "Failed to configure at least one certificate and key "
+                     "for %s", sc->vhost_id);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+#if defined(HAVE_OCSP_STAPLING) && defined(SSL_CTRL_SET_CURRENT_CERT)
+    /*
+     * OpenSSL 1.0.2 and later allows iterating over all SSL_CTX certs
+     * by means of SSL_CTX_set_current_cert. Enabling stapling at this
+     * (late) point makes sure that we catch both certificates loaded
+     * via SSLCertificateFile and SSLOpenSSLConfCmd Certificate.
+     */
+    do {
+        X509 *cert;
+        int i = 0;
+        int ret = SSL_CTX_set_current_cert(sc->server->ssl_ctx,
+                                           SSL_CERT_SET_FIRST);
+        while (ret) {
+            cert = SSL_CTX_get0_certificate(sc->server->ssl_ctx);
+            if (!cert || !ssl_stapling_init_cert(s, p, ptemp, sc->server,
+                                                 cert)) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02604)
+                             "Unable to configure certificate %s:%d "
+                             "for stapling", sc->vhost_id, i);
+            }
+            ret = SSL_CTX_set_current_cert(sc->server->ssl_ctx,
+                                           SSL_CERT_SET_NEXT);
+            i++;
+        }
+    } while(0);
+#endif
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    if ((rv = ssl_init_ticket_key(s, p, ptemp, sc->server)) != APR_SUCCESS) {
+        return rv;
+    }
+#endif
+
+    SSL_CTX_set_timeout(sc->server->ssl_ctx,
+                        sc->session_cache_timeout == UNSET ?
+                        SSL_SESSION_CACHE_TIMEOUT : sc->session_cache_timeout);
+
+    return APR_SUCCESS;
+}
+
+/*
+ * Configure a particular server
+ */
+apr_status_t ssl_init_ConfigureServer(server_rec *s,
+                                      apr_pool_t *p,
+                                      apr_pool_t *ptemp,
+                                      SSLSrvConfigRec *sc,
+                                      apr_array_header_t *pphrases)
+{
+    SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults,
+                                                &ssl_module);
+    apr_status_t rv;
+
+    /* Initialize the server if SSL is enabled or optional.
+     */
+    if ((sc->enabled == SSL_ENABLED_TRUE) || (sc->enabled == SSL_ENABLED_OPTIONAL)) {
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01914)
+                     "Configuring server %s for SSL protocol", sc->vhost_id);
+        if ((rv = ssl_init_server_ctx(s, p, ptemp, sc, pphrases))
+            != APR_SUCCESS) {
+            return rv;
+        }
+
+	/* Initialize OCSP Responder certificate if OCSP enabled */
+	#ifndef OPENSSL_NO_OCSP
+        	ssl_init_ocsp_certificates(s, sc->server);
+	#endif
+
+    }
+
+    sdc->proxy->sc = sc;
+    if (sdc->proxy_enabled == TRUE) {
+        rv = ssl_init_proxy_ctx(s, p, ptemp, sdc->proxy);
+        if (rv != APR_SUCCESS) {
+            return rv;
+        }
+    }
+    else {
+        sdc->proxy_enabled = FALSE;
+    }
+    sdc->proxy_post_config = 1;
+
+    return APR_SUCCESS;
+}
+
+apr_status_t ssl_init_CheckServers(server_rec *base_server, apr_pool_t *p)
+{
+    server_rec *s;
+    SSLSrvConfigRec *sc;
+#ifndef HAVE_TLSEXT
+    server_rec *ps;
+    apr_hash_t *table;
+    const char *key;
+    apr_ssize_t klen;
+
+    BOOL conflict = FALSE;
+#endif
+
+    /*
+     * Give out warnings when a server has HTTPS configured
+     * for the HTTP port or vice versa
+     */
+    for (s = base_server; s; s = s->next) {
+        sc = mySrvConfig(s);
+
+        if ((sc->enabled == SSL_ENABLED_TRUE) && (s->port == DEFAULT_HTTP_PORT)) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
+                         base_server, APLOGNO(01915)
+                         "Init: (%s) You configured HTTPS(%d) "
+                         "on the standard HTTP(%d) port!",
+                         ssl_util_vhostid(p, s),
+                         DEFAULT_HTTPS_PORT, DEFAULT_HTTP_PORT);
+        }
+
+        if ((sc->enabled == SSL_ENABLED_FALSE) && (s->port == DEFAULT_HTTPS_PORT)) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
+                         base_server, APLOGNO(01916)
+                         "Init: (%s) You configured HTTP(%d) "
+                         "on the standard HTTPS(%d) port!",
+                         ssl_util_vhostid(p, s),
+                         DEFAULT_HTTP_PORT, DEFAULT_HTTPS_PORT);
+        }
+    }
+
+#ifndef HAVE_TLSEXT
+    /*
+     * Give out warnings when more than one SSL-aware virtual server uses the
+     * same IP:port and an OpenSSL version without support for TLS extensions
+     * (SNI in particular) is used.
+     */
+    table = apr_hash_make(p);
+
+    for (s = base_server; s; s = s->next) {
+        char *addr;
+
+        sc = mySrvConfig(s);
+
+        if (!((sc->enabled == SSL_ENABLED_TRUE) && s->addrs)) {
+            continue;
+        }
+
+        apr_sockaddr_ip_get(&addr, s->addrs->host_addr);
+        key = apr_psprintf(p, "%s:%u", addr, s->addrs->host_port);
+        klen = strlen(key);
+
+        if ((ps = (server_rec *)apr_hash_get(table, key, klen))) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(02662)
+                         "Init: SSL server IP/port conflict: "
+                         "%s (%s:%d) vs. %s (%s:%d)",
+                         ssl_util_vhostid(p, s),
+                         (s->defn_name ? s->defn_name : "unknown"),
+                         s->defn_line_number,
+                         ssl_util_vhostid(p, ps),
+                         (ps->defn_name ? ps->defn_name : "unknown"),
+                         ps->defn_line_number);
+            conflict = TRUE;
+            continue;
+        }
+
+        apr_hash_set(table, key, klen, s);
+    }
+
+    if (conflict) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, base_server, APLOGNO(01917)
+                     "Init: Name-based SSL virtual hosts require "
+                     "an OpenSSL version with support for TLS extensions "
+                     "(RFC 6066 - Server Name Indication / SNI), "
+                     "but the currently used library version (%s) is "
+                     "lacking this feature", MODSSL_LIBRARY_DYNTEXT);
+    }
+#endif
+
+    return APR_SUCCESS;
+}
+
+int ssl_proxy_section_post_config(apr_pool_t *p, apr_pool_t *plog,
+                                  apr_pool_t *ptemp, server_rec *s,
+                                  ap_conf_vector_t *section_config)
+{
+    SSLDirConfigRec *sdc = ap_get_module_config(s->lookup_defaults,
+                                                &ssl_module);
+    SSLDirConfigRec *pdc = ap_get_module_config(section_config,
+                                                &ssl_module);
+    if (pdc) {
+        pdc->proxy->sc = mySrvConfig(s);
+        ssl_config_proxy_merge(p, sdc, pdc);
+        if (pdc->proxy_enabled) {
+            apr_status_t rv;
+
+            rv = ssl_init_proxy_ctx(s, p, ptemp, pdc->proxy);
+            if (rv != APR_SUCCESS) {
+                return !OK;
+            }
+
+            rv = ssl_run_init_server(s, p, 1, pdc->proxy->ssl_ctx);
+            if (rv != APR_SUCCESS) {
+                return !OK;
+            }
+        }
+        pdc->proxy_post_config = 1;
+    }
+    return OK;
+}
+
+static int ssl_init_FindCAList_X509NameCmp(const X509_NAME * const *a,
+                                           const X509_NAME * const *b)
+{
+    return(X509_NAME_cmp(*a, *b));
+}
+
+static void ssl_init_PushCAList(STACK_OF(X509_NAME) *ca_list,
+                                server_rec *s, apr_pool_t *ptemp,
+                                const char *file)
+{
+    int n;
+    STACK_OF(X509_NAME) *sk;
+
+    sk = (STACK_OF(X509_NAME) *)
+             SSL_load_client_CA_file(file);
+
+    if (!sk) {
+        return;
+    }
+
+    for (n = 0; n < sk_X509_NAME_num(sk); n++) {
+        X509_NAME *name = sk_X509_NAME_value(sk, n);
+
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02209)
+                     "CA certificate: %s",
+                     modssl_X509_NAME_to_string(ptemp, name, 0));
+
+        /*
+         * note that SSL_load_client_CA_file() checks for duplicates,
+         * but since we call it multiple times when reading a directory
+         * we must also check for duplicates ourselves.
+         */
+
+        if (sk_X509_NAME_find(ca_list, name) < 0) {
+            /* this will be freed when ca_list is */
+            sk_X509_NAME_push(ca_list, name);
+        }
+        else {
+            /* need to free this ourselves, else it will leak */
+            X509_NAME_free(name);
+        }
+    }
+
+    sk_X509_NAME_free(sk);
+}
+
+static apr_status_t ssl_init_ca_cert_path(server_rec *s,
+                                          apr_pool_t *ptemp,
+                                          const char *path,
+                                          STACK_OF(X509_NAME) *ca_list,
+                                          STACK_OF(X509_INFO) *xi_list)
+{
+    apr_dir_t *dir;
+    apr_finfo_t direntry;
+    apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME;
+
+    if (!path || (!ca_list && !xi_list) ||
+        (apr_dir_open(&dir, path, ptemp) != APR_SUCCESS)) {
+        return APR_EGENERAL;
+    }
+
+    while ((apr_dir_read(&direntry, finfo_flags, dir)) == APR_SUCCESS) {
+        const char *file;
+        if (direntry.filetype == APR_DIR) {
+            continue; /* don't try to load directories */
+        }
+        file = apr_pstrcat(ptemp, path, "/", direntry.name, NULL);
+        if (ca_list) {
+            ssl_init_PushCAList(ca_list, s, ptemp, file);
+        }
+        if (xi_list) {
+            load_x509_info(ptemp, xi_list, file);
+        }
+    }
+
+    apr_dir_close(dir);
+
+    return APR_SUCCESS;
+}
+
+STACK_OF(X509_NAME) *ssl_init_FindCAList(server_rec *s,
+                                         apr_pool_t *ptemp,
+                                         const char *ca_file,
+                                         const char *ca_path)
+{
+    STACK_OF(X509_NAME) *ca_list;
+
+    /*
+     * Start with a empty stack/list where new
+     * entries get added in sorted order.
+     */
+    ca_list = sk_X509_NAME_new(ssl_init_FindCAList_X509NameCmp);
+
+    /*
+     * Process CA certificate bundle file
+     */
+    if (ca_file) {
+        ssl_init_PushCAList(ca_list, s, ptemp, ca_file);
+        /*
+         * If ca_list is still empty after trying to load ca_file
+         * then the file failed to load, and users should hear about that.
+         */
+        if (sk_X509_NAME_num(ca_list) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02210)
+                    "Failed to load SSLCACertificateFile: %s", ca_file);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+        }
+    }
+
+    /*
+     * Process CA certificate path files
+     */
+    if (ca_path &&
+        ssl_init_ca_cert_path(s, ptemp,
+                              ca_path, ca_list, NULL) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02211)
+                     "Failed to open Certificate Path `%s'", ca_path);
+        sk_X509_NAME_pop_free(ca_list, X509_NAME_free);
+        return NULL;
+    }
+
+    /*
+     * Cleanup
+     */
+    (void) sk_X509_NAME_set_cmp_func(ca_list, NULL);
+
+    return ca_list;
+}
+
+void ssl_init_Child(apr_pool_t *p, server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    mc->pid = getpid(); /* only call getpid() once per-process */
+
+    /* XXX: there should be an ap_srand() function */
+    srand((unsigned int)time(NULL));
+
+    /* open the mutex lockfile */
+    ssl_mutex_reinit(s, p);
+#ifdef HAVE_OCSP_STAPLING
+    ssl_stapling_mutex_reinit(s, p);
+#endif
+}
+
+apr_status_t ssl_init_ModuleKill(void *data)
+{
+    SSLSrvConfigRec *sc;
+    server_rec *base_server = (server_rec *)data;
+    server_rec *s;
+
+    /*
+     * Drop the session cache and mutex
+     */
+    ssl_scache_kill(base_server);
+
+    /*
+     * Free the non-pool allocated structures
+     * in the per-server configurations
+     */
+    for (s = base_server; s; s = s->next) {
+        sc = mySrvConfig(s);
+
+        ssl_init_ctx_cleanup(sc->server);
+
+	/* Not Sure but possibly clear X509 trusted cert file */
+	#ifndef OPENSSL_NO_OCSP
+		sk_X509_pop_free(sc->server->ocsp_certs, X509_free);
+	#endif
+
+    }
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    free_dh_params();
+#else
+    free_bio_methods();
+#endif
+
+    return APR_SUCCESS;
+}
diff --git a/modules/ssl/ssl_engine_io.c b/modules/ssl/ssl_engine_io.c
new file mode 100644
index 0000000..f14fc9b
--- /dev/null
+++ b/modules/ssl/ssl_engine_io.c
@@ -0,0 +1,2419 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_io.c
+ *  I/O Functions
+ */
+                             /* ``MY HACK: This universe.
+                                  Just one little problem:
+                                  core keeps dumping.''
+                                            -- Unknown    */
+#include "ssl_private.h"
+#include "mod_ssl.h"
+#include "mod_ssl_openssl.h"
+#include "apr_date.h"
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, proxy_post_handshake,
+                                    (conn_rec *c,SSL *ssl),
+                                    (c,ssl),OK,DECLINED);
+
+/*  _________________________________________________________________
+**
+**  I/O Hooks
+**  _________________________________________________________________
+*/
+
+/* This file is designed to be the bridge between OpenSSL and httpd.
+ * However, we really don't expect anyone (let alone ourselves) to
+ * remember what is in this file.  So, first, a quick overview.
+ *
+ * In this file, you will find:
+ * - ssl_io_filter_input    (Apache input filter)
+ * - ssl_io_filter_output   (Apache output filter)
+ *
+ * - bio_filter_in_*        (OpenSSL input filter)
+ * - bio_filter_out_*       (OpenSSL output filter)
+ *
+ * The input chain is roughly:
+ *
+ * ssl_io_filter_input->ssl_io_input_read->SSL_read->...
+ * ...->bio_filter_in_read->ap_get_brigade/next-httpd-filter
+ *
+ * In mortal terminology, we do the following:
+ * - Receive a request for data to the SSL input filter
+ * - Call a helper function once we know we should perform a read
+ * - Call OpenSSL's SSL_read()
+ * - SSL_read() will then call bio_filter_in_read
+ * - bio_filter_in_read will then try to fetch data from the next httpd filter
+ * - bio_filter_in_read will flatten that data and return it to SSL_read
+ * - SSL_read will then decrypt the data
+ * - ssl_io_input_read will then receive decrypted data as a char* and
+ *   ensure that there were no read errors
+ * - The char* is placed in a brigade and returned
+ *
+ * Since connection-level input filters in httpd need to be able to
+ * handle AP_MODE_GETLINE calls (namely identifying LF-terminated strings),
+ * ssl_io_input_getline which will handle this special case.
+ *
+ * Due to AP_MODE_GETLINE and AP_MODE_SPECULATIVE, we may sometimes have
+ * 'leftover' decoded data which must be setaside for the next read.  That
+ * is currently handled by the char_buffer_{read|write} functions.  So,
+ * ssl_io_input_read may be able to fulfill reads without invoking
+ * SSL_read().
+ *
+ * Note that the filter context of ssl_io_filter_input and bio_filter_in_*
+ * are shared as bio_filter_in_ctx_t.
+ *
+ * Note that the filter is by choice limited to reading at most
+ * AP_IOBUFSIZE (8192 bytes) per call.
+ *
+ */
+
+/* this custom BIO allows us to hook SSL_write directly into
+ * an apr_bucket_brigade and use transient buckets with the SSL
+ * malloc-ed buffer, rather than copying into a mem BIO.
+ * also allows us to pass the brigade as data is being written
+ * rather than buffering up the entire response in the mem BIO.
+ *
+ * when SSL needs to flush (e.g. SSL_accept()), it will call BIO_flush()
+ * which will trigger a call to bio_filter_out_ctrl() -> bio_filter_out_flush().
+ * so we only need to flush the output ourselves if we receive an
+ * EOS or FLUSH bucket. this was not possible with the mem BIO where we
+ * had to flush all over the place not really knowing when it was required
+ * to do so.
+ */
+
+typedef struct {
+    SSL                *pssl;
+    BIO                *pbioRead;
+    BIO                *pbioWrite;
+    ap_filter_t        *pInputFilter;
+    ap_filter_t        *pOutputFilter;
+    SSLConnRec         *config;
+} ssl_filter_ctx_t;
+
+typedef struct {
+    ssl_filter_ctx_t *filter_ctx;
+    conn_rec *c;
+    apr_bucket_brigade *bb;    /* Brigade used as a buffer. */
+    apr_status_t rc;
+} bio_filter_out_ctx_t;
+
+static bio_filter_out_ctx_t *bio_filter_out_ctx_new(ssl_filter_ctx_t *filter_ctx,
+                                                    conn_rec *c)
+{
+    bio_filter_out_ctx_t *outctx = apr_palloc(c->pool, sizeof(*outctx));
+
+    outctx->filter_ctx = filter_ctx;
+    outctx->c = c;
+    outctx->bb = apr_brigade_create(c->pool, c->bucket_alloc);
+
+    return outctx;
+}
+
+/* Pass an output brigade down the filter stack; returns 1 on success
+ * or -1 on failure. */
+static int bio_filter_out_pass(bio_filter_out_ctx_t *outctx)
+{
+    AP_DEBUG_ASSERT(!APR_BRIGADE_EMPTY(outctx->bb));
+
+    outctx->rc = ap_pass_brigade(outctx->filter_ctx->pOutputFilter->next,
+                                 outctx->bb);
+    /* Fail if the connection was reset: */
+    if (outctx->rc == APR_SUCCESS && outctx->c->aborted) {
+        outctx->rc = APR_ECONNRESET;
+    }
+    return (outctx->rc == APR_SUCCESS) ? 1 : -1;
+}
+
+/* Send a FLUSH bucket down the output filter stack; returns 1 on
+ * success, -1 on failure. */
+static int bio_filter_out_flush(BIO *bio)
+{
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+    apr_bucket *e;
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, outctx->c,
+                  "bio_filter_out_write: flush");
+
+    AP_DEBUG_ASSERT(APR_BRIGADE_EMPTY(outctx->bb));
+
+    e = apr_bucket_flush_create(outctx->bb->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(outctx->bb, e);
+
+    return bio_filter_out_pass(outctx);
+}
+
+static int bio_filter_create(BIO *bio)
+{
+    BIO_set_shutdown(bio, 1);
+    BIO_set_init(bio, 1);
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    /* No setter method for OpenSSL 1.1.0 available,
+     * but I can't find any functional use of the
+     * "num" field there either.
+     */
+    bio->num = -1;
+#endif
+    BIO_set_data(bio, NULL);
+
+    return 1;
+}
+
+static int bio_filter_destroy(BIO *bio)
+{
+    if (bio == NULL) {
+        return 0;
+    }
+
+    /* nothing to free here.
+     * apache will destroy the bucket brigade for us
+     */
+    return 1;
+}
+
+static int bio_filter_out_read(BIO *bio, char *out, int outl)
+{
+    /* this is never called */
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, outctx->c,
+                  "BUG: %s() should not be called", "bio_filter_out_read");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+static int bio_filter_out_write(BIO *bio, const char *in, int inl)
+{
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+    apr_bucket *e;
+    int need_flush;
+
+    BIO_clear_retry_flags(bio);
+
+    /* Abort early if the client has initiated a renegotiation. */
+    if (outctx->filter_ctx->config->reneg_state == RENEG_ABORT) {
+        outctx->rc = APR_ECONNABORTED;
+        return -1;
+    }
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, outctx->c,
+                  "bio_filter_out_write: %i bytes", inl);
+
+    /* Use a transient bucket for the output data - any downstream
+     * filter must setaside if necessary. */
+    e = apr_bucket_transient_create(in, inl, outctx->bb->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(outctx->bb, e);
+
+    /* In theory, OpenSSL should flush as necessary, but it is known
+     * not to do so correctly in some cases (< 0.9.8m; see PR 46952),
+     * or on the proxy/client side (after ssl23_client_hello(), e.g.
+     * ssl/proxy.t test suite).
+     *
+     * Historically, this flush call was performed only for an SSLv2
+     * connection or for a proxy connection.  Calling _out_flush can
+     * be expensive in cases where requests/responses are pipelined,
+     * so limit the performance impact to handshake time.
+     */
+#if OPENSSL_VERSION_NUMBER < 0x0009080df
+     need_flush = !SSL_is_init_finished(outctx->filter_ctx->pssl);
+#else
+     need_flush = SSL_in_connect_init(outctx->filter_ctx->pssl);
+#endif
+    if (need_flush) {
+        e = apr_bucket_flush_create(outctx->bb->bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(outctx->bb, e);
+    }
+
+    if (bio_filter_out_pass(outctx) < 0) {
+        return -1;
+    }
+
+    return inl;
+}
+
+static long bio_filter_out_ctrl(BIO *bio, int cmd, long num, void *ptr)
+{
+    long ret = 1;
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+
+    switch (cmd) {
+    case BIO_CTRL_RESET:
+    case BIO_CTRL_EOF:
+    case BIO_C_SET_BUF_MEM_EOF_RETURN:
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, outctx->c,
+                      "output bio: unhandled control %d", cmd);
+        ret = 0;
+        break;
+    case BIO_CTRL_WPENDING:
+    case BIO_CTRL_PENDING:
+    case BIO_CTRL_INFO:
+        ret = 0;
+        break;
+    case BIO_CTRL_GET_CLOSE:
+        ret = (long)BIO_get_shutdown(bio);
+        break;
+      case BIO_CTRL_SET_CLOSE:
+        BIO_set_shutdown(bio, (int)num);
+        break;
+      case BIO_CTRL_FLUSH:
+        ret = bio_filter_out_flush(bio);
+        break;
+      case BIO_CTRL_DUP:
+        ret = 1;
+        break;
+        /* N/A */
+      case BIO_C_SET_BUF_MEM:
+      case BIO_C_GET_BUF_MEM_PTR:
+        /* we don't care */
+      case BIO_CTRL_PUSH:
+      case BIO_CTRL_POP:
+      default:
+        ret = 0;
+        break;
+    }
+
+    return ret;
+}
+
+static int bio_filter_out_gets(BIO *bio, char *buf, int size)
+{
+    /* this is never called */
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, outctx->c,
+                  "BUG: %s() should not be called", "bio_filter_out_gets");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+static int bio_filter_out_puts(BIO *bio, const char *str)
+{
+    /* this is never called */
+    bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, outctx->c,
+                  "BUG: %s() should not be called", "bio_filter_out_puts");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+typedef struct {
+    int length;
+    char *value;
+} char_buffer_t;
+
+typedef struct {
+    SSL *ssl;
+    BIO *bio_out;
+    ap_filter_t *f;
+    apr_status_t rc;
+    ap_input_mode_t mode;
+    apr_read_type_e block;
+    apr_bucket_brigade *bb;
+    char_buffer_t cbuf;
+    apr_pool_t *pool;
+    char buffer[AP_IOBUFSIZE];
+    ssl_filter_ctx_t *filter_ctx;
+} bio_filter_in_ctx_t;
+
+/*
+ * this char_buffer api might seem silly, but we don't need to copy
+ * any of this data and we need to remember the length.
+ */
+
+/* Copy up to INL bytes from the char_buffer BUFFER into IN.  Note
+ * that due to the strange way this API is designed/used, the
+ * char_buffer object is used to cache a segment of inctx->buffer, and
+ * then this function called to copy (part of) that segment to the
+ * beginning of inctx->buffer.  So the segments to copy cannot be
+ * presumed to be non-overlapping, and memmove must be used. */
+static int char_buffer_read(char_buffer_t *buffer, char *in, int inl)
+{
+    if (!buffer->length) {
+        return 0;
+    }
+
+    if (buffer->length > inl) {
+        /* we have enough to fill the caller's buffer */
+        memmove(in, buffer->value, inl);
+        buffer->value += inl;
+        buffer->length -= inl;
+    }
+    else {
+        /* swallow remainder of the buffer */
+        memmove(in, buffer->value, buffer->length);
+        inl = buffer->length;
+        buffer->value = NULL;
+        buffer->length = 0;
+    }
+
+    return inl;
+}
+
+static int char_buffer_write(char_buffer_t *buffer, char *in, int inl)
+{
+    buffer->value = in;
+    buffer->length = inl;
+    return inl;
+}
+
+/* This function will read from a brigade and discard the read buckets as it
+ * proceeds.  It will read at most *len bytes.
+ */
+static apr_status_t brigade_consume(apr_bucket_brigade *bb,
+                                    apr_read_type_e block,
+                                    char *c, apr_size_t *len)
+{
+    apr_size_t actual = 0;
+    apr_status_t status = APR_SUCCESS;
+
+    while (!APR_BRIGADE_EMPTY(bb)) {
+        apr_bucket *b = APR_BRIGADE_FIRST(bb);
+        const char *str;
+        apr_size_t str_len;
+        apr_size_t consume;
+
+        /* Justin points out this is an http-ism that might
+         * not fit if brigade_consume is added to APR.  Perhaps
+         * apr_bucket_read(eos_bucket) should return APR_EOF?
+         * Then this becomes mainline instead of a one-off.
+         */
+        if (APR_BUCKET_IS_EOS(b)) {
+            status = APR_EOF;
+            break;
+        }
+
+        /* The reason I'm not offering brigade_consume yet
+         * across to apr-util is that the following call
+         * illustrates how borked that API really is.  For
+         * this sort of case (caller provided buffer) it
+         * would be much more trivial for apr_bucket_consume
+         * to do all the work that follows, based on the
+         * particular characteristics of the bucket we are
+         * consuming here.
+         */
+        status = apr_bucket_read(b, &str, &str_len, block);
+
+        if (status != APR_SUCCESS) {
+            if (APR_STATUS_IS_EOF(status)) {
+                /* This stream bucket was consumed */
+                apr_bucket_delete(b);
+                continue;
+            }
+            break;
+        }
+
+        if (str_len > 0) {
+            /* Do not block once some data has been consumed */
+            block = APR_NONBLOCK_READ;
+
+            /* Assure we don't overflow. */
+            consume = (str_len + actual > *len) ? *len - actual : str_len;
+
+            memcpy(c, str, consume);
+
+            c += consume;
+            actual += consume;
+
+            if (consume >= b->length) {
+                /* This physical bucket was consumed */
+                apr_bucket_delete(b);
+            }
+            else {
+                /* Only part of this physical bucket was consumed */
+                b->start += consume;
+                b->length -= consume;
+            }
+        }
+        else if (b->length == 0) {
+            apr_bucket_delete(b);
+        }
+
+        /* This could probably be actual == *len, but be safe from stray
+         * photons. */
+        if (actual >= *len) {
+            break;
+        }
+    }
+
+    *len = actual;
+    return status;
+}
+
+/*
+ * this is the function called by SSL_read()
+ */
+static int bio_filter_in_read(BIO *bio, char *in, int inlen)
+{
+    apr_size_t inl = inlen;
+    bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)BIO_get_data(bio);
+    apr_read_type_e block = inctx->block;
+
+    inctx->rc = APR_SUCCESS;
+
+    /* OpenSSL catches this case, so should we. */
+    if (!in)
+        return 0;
+
+    BIO_clear_retry_flags(bio);
+
+    /* Abort early if the client has initiated a renegotiation. */
+    if (inctx->filter_ctx->config->reneg_state == RENEG_ABORT) {
+        inctx->rc = APR_ECONNABORTED;
+        return -1;
+    }
+
+    if (!inctx->bb) {
+        inctx->rc = APR_EOF;
+        return -1;
+    }
+
+    if (APR_BRIGADE_EMPTY(inctx->bb)) {
+
+        inctx->rc = ap_get_brigade(inctx->f->next, inctx->bb,
+                                   AP_MODE_READBYTES, block,
+                                   inl);
+
+        /* If the read returns EAGAIN or success with an empty
+         * brigade, return an error after setting the retry flag;
+         * SSL_read() will then return -1, and SSL_get_error() will
+         * indicate SSL_ERROR_WANT_READ. */
+        if (APR_STATUS_IS_EAGAIN(inctx->rc) || APR_STATUS_IS_EINTR(inctx->rc)
+               || (inctx->rc == APR_SUCCESS && APR_BRIGADE_EMPTY(inctx->bb))) {
+            BIO_set_retry_read(bio);
+            return -1;
+        }
+
+        if (block == APR_BLOCK_READ 
+            && APR_STATUS_IS_TIMEUP(inctx->rc)
+            && APR_BRIGADE_EMPTY(inctx->bb)) {
+            /* don't give up, just return the timeout */
+            return -1;
+        }
+        if (inctx->rc != APR_SUCCESS) {
+            /* Unexpected errors discard the brigade */
+            apr_brigade_cleanup(inctx->bb);
+            inctx->bb = NULL;
+            return -1;
+        }
+    }
+
+    inctx->rc = brigade_consume(inctx->bb, block, in, &inl);
+
+    if (inctx->rc == APR_SUCCESS) {
+        return (int)inl;
+    }
+
+    if (APR_STATUS_IS_EAGAIN(inctx->rc)
+            || APR_STATUS_IS_EINTR(inctx->rc)) {
+        BIO_set_retry_read(bio);
+        return (int)inl;
+    }
+
+    /* Unexpected errors and APR_EOF clean out the brigade.
+     * Subsequent calls will return APR_EOF.
+     */
+    apr_brigade_cleanup(inctx->bb);
+    inctx->bb = NULL;
+
+    if (APR_STATUS_IS_EOF(inctx->rc) && inl) {
+        /* Provide the results of this read pass,
+         * without resetting the BIO retry_read flag
+         */
+        return (int)inl;
+    }
+
+    return -1;
+}
+
+static int bio_filter_in_write(BIO *bio, const char *in, int inl)
+{
+    bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, inctx->f->c,
+                  "BUG: %s() should not be called", "bio_filter_in_write");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+static int bio_filter_in_puts(BIO *bio, const char *str)
+{
+    bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, inctx->f->c,
+                  "BUG: %s() should not be called", "bio_filter_in_puts");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+static int bio_filter_in_gets(BIO *bio, char *buf, int size)
+{
+    bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)BIO_get_data(bio);
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, inctx->f->c,
+                  "BUG: %s() should not be called", "bio_filter_in_gets");
+    AP_DEBUG_ASSERT(0);
+    return -1;
+}
+
+static long bio_filter_in_ctrl(BIO *bio, int cmd, long num, void *ptr)
+{
+    bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)BIO_get_data(bio);
+    switch (cmd) {
+#ifdef BIO_CTRL_EOF
+    case BIO_CTRL_EOF:
+        return inctx->rc == APR_EOF;
+#endif
+    default:
+        break;
+    }
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, inctx->f->c,
+                  "BUG: bio_filter_in_ctrl() should not be called with cmd=%i",
+                  cmd);
+    return 0;
+}
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+        
+static BIO_METHOD bio_filter_out_method = {
+    BIO_TYPE_MEM,
+    "APR output filter",
+    bio_filter_out_write,
+    bio_filter_out_read,     /* read is never called */
+    bio_filter_out_puts,     /* puts is never called */
+    bio_filter_out_gets,     /* gets is never called */
+    bio_filter_out_ctrl,
+    bio_filter_create,
+    bio_filter_destroy,
+    NULL
+};
+
+static BIO_METHOD bio_filter_in_method = {
+    BIO_TYPE_MEM,
+    "APR input filter",
+    bio_filter_in_write,        /* write is never called */
+    bio_filter_in_read,
+    bio_filter_in_puts,         /* puts is never called */
+    bio_filter_in_gets,         /* gets is never called */
+    bio_filter_in_ctrl,         /* ctrl is called for EOF check */
+    bio_filter_create,
+    bio_filter_destroy,
+    NULL
+};
+
+#else
+
+static BIO_METHOD *bio_filter_out_method = NULL;
+static BIO_METHOD *bio_filter_in_method = NULL;
+
+void init_bio_methods(void)
+{
+    bio_filter_out_method = BIO_meth_new(BIO_TYPE_MEM, "APR output filter");
+    BIO_meth_set_write(bio_filter_out_method, &bio_filter_out_write);
+    BIO_meth_set_read(bio_filter_out_method, &bio_filter_out_read); /* read is never called */
+    BIO_meth_set_puts(bio_filter_out_method, &bio_filter_out_puts); /* puts is never called */
+    BIO_meth_set_gets(bio_filter_out_method, &bio_filter_out_gets); /* gets is never called */
+    BIO_meth_set_ctrl(bio_filter_out_method, &bio_filter_out_ctrl);
+    BIO_meth_set_create(bio_filter_out_method, &bio_filter_create);
+    BIO_meth_set_destroy(bio_filter_out_method, &bio_filter_destroy);
+
+    bio_filter_in_method = BIO_meth_new(BIO_TYPE_MEM, "APR input filter");
+    BIO_meth_set_write(bio_filter_in_method, &bio_filter_in_write); /* write is never called */
+    BIO_meth_set_read(bio_filter_in_method, &bio_filter_in_read);
+    BIO_meth_set_puts(bio_filter_in_method, &bio_filter_in_puts);   /* puts is never called */
+    BIO_meth_set_gets(bio_filter_in_method, &bio_filter_in_gets);   /* gets is never called */
+    BIO_meth_set_ctrl(bio_filter_in_method, &bio_filter_in_ctrl);   /* ctrl is never called */
+    BIO_meth_set_create(bio_filter_in_method, &bio_filter_create);
+    BIO_meth_set_destroy(bio_filter_in_method, &bio_filter_destroy);
+}
+
+void free_bio_methods(void)
+{
+    BIO_meth_free(bio_filter_out_method);
+    BIO_meth_free(bio_filter_in_method);
+}
+#endif
+
+static apr_status_t ssl_io_input_read(bio_filter_in_ctx_t *inctx,
+                                      char *buf,
+                                      apr_size_t *len)
+{
+    apr_size_t wanted = *len;
+    apr_size_t bytes = 0;
+    int rc;
+
+    *len = 0;
+
+    /* If we have something leftover from last time, try that first. */
+    if ((bytes = char_buffer_read(&inctx->cbuf, buf, wanted))) {
+        *len = bytes;
+        if (inctx->mode == AP_MODE_SPECULATIVE) {
+            /* We want to rollback this read. */
+            if (inctx->cbuf.length > 0) {
+                inctx->cbuf.value -= bytes;
+                inctx->cbuf.length += bytes;
+            } else {
+                char_buffer_write(&inctx->cbuf, buf, (int)bytes);
+            }
+            return APR_SUCCESS;
+        }
+        /* This could probably be *len == wanted, but be safe from stray
+         * photons.
+         */
+        if (*len >= wanted) {
+            return APR_SUCCESS;
+        }
+        if (inctx->mode == AP_MODE_GETLINE) {
+            if (memchr(buf, APR_ASCII_LF, *len)) {
+                return APR_SUCCESS;
+            }
+        }
+        else {
+            /* Down to a nonblock pattern as we have some data already
+             */
+            inctx->block = APR_NONBLOCK_READ;
+        }
+    }
+
+    while (1) {
+
+        if (!inctx->filter_ctx->pssl) {
+            /* Ensure a non-zero error code is returned */
+            if (inctx->rc == APR_SUCCESS) {
+                inctx->rc = APR_EGENERAL;
+            }
+            break;
+        }
+
+        /* We rely on SSL_get_error() after the read, which requires an empty
+         * error queue before the read in order to work properly.
+         */
+        ERR_clear_error();
+
+        /* SSL_read may not read because we haven't taken enough data
+         * from the stack.  This is where we want to consider all of
+         * the blocking and SPECULATIVE semantics
+         */
+        rc = SSL_read(inctx->filter_ctx->pssl, buf + bytes, wanted - bytes);
+
+        if (rc > 0) {
+            *len += rc;
+            if (inctx->mode == AP_MODE_SPECULATIVE) {
+                /* We want to rollback this read. */
+                char_buffer_write(&inctx->cbuf, buf, rc);
+            }
+            return inctx->rc;
+        }
+        else /* (rc <= 0) */ {
+            int ssl_err;
+            conn_rec *c;
+            if (rc == 0) {
+                /* If EAGAIN, we will loop given a blocking read,
+                 * otherwise consider ourselves at EOF.
+                 */
+                if (APR_STATUS_IS_EAGAIN(inctx->rc)
+                        || APR_STATUS_IS_EINTR(inctx->rc)) {
+                    /* Already read something, return APR_SUCCESS instead.
+                     * On win32 in particular, but perhaps on other kernels,
+                     * a blocking call isn't 'always' blocking.
+                     */
+                    if (*len > 0) {
+                        inctx->rc = APR_SUCCESS;
+                        break;
+                    }
+                    if (inctx->block == APR_NONBLOCK_READ) {
+                        break;
+                    }
+                }
+                else {
+                    if (*len > 0) {
+                        inctx->rc = APR_SUCCESS;
+                        break;
+                    }
+                }
+            }
+            ssl_err = SSL_get_error(inctx->filter_ctx->pssl, rc);
+            c = (conn_rec*)SSL_get_app_data(inctx->filter_ctx->pssl);
+
+            if (ssl_err == SSL_ERROR_WANT_READ) {
+                /*
+                 * If OpenSSL wants to read more, and we were nonblocking,
+                 * report as an EAGAIN.  Otherwise loop, pulling more
+                 * data from network filter.
+                 *
+                 * (This is usually the case when the client forces an SSL
+                 * renegotiation which is handled implicitly by OpenSSL.)
+                 */
+                inctx->rc = APR_EAGAIN;
+
+                if (*len > 0) {
+                    inctx->rc = APR_SUCCESS;
+                    break;
+                }
+                if (inctx->block == APR_NONBLOCK_READ) {
+                    break;
+                }
+                continue;  /* Blocking and nothing yet?  Try again. */
+            }
+            else if (ssl_err == SSL_ERROR_SYSCALL) {
+                if (APR_STATUS_IS_EAGAIN(inctx->rc)
+                        || APR_STATUS_IS_EINTR(inctx->rc)) {
+                    /* Already read something, return APR_SUCCESS instead. */
+                    if (*len > 0) {
+                        inctx->rc = APR_SUCCESS;
+                        break;
+                    }
+                    if (inctx->block == APR_NONBLOCK_READ) {
+                        break;
+                    }
+                    continue;  /* Blocking and nothing yet?  Try again. */
+                }
+                else if (APR_STATUS_IS_TIMEUP(inctx->rc)) {
+                    /* just return it, the calling layer might be fine with it,
+                       and we do not want to bloat the log. */
+                }
+                else {
+                    ap_log_cerror(APLOG_MARK, APLOG_INFO, inctx->rc, c, APLOGNO(01991)
+                                  "SSL input filter read failed.");
+                }
+            }
+            else if (rc == 0 && ssl_err == SSL_ERROR_ZERO_RETURN) {
+                inctx->rc = APR_EOF;
+                break;
+            }
+            else /* if (ssl_err == SSL_ERROR_SSL) */ {
+                /*
+                 * Log SSL errors and any unexpected conditions.
+                 */
+                ap_log_cerror(APLOG_MARK, APLOG_INFO, inctx->rc, c, APLOGNO(01992)
+                              "SSL library error %d reading data", ssl_err);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, mySrvFromConn(c));
+
+            }
+            if (rc == 0) {
+                inctx->rc = APR_EOF;
+                break;
+            }
+            if (inctx->rc == APR_SUCCESS) {
+                inctx->rc = APR_EGENERAL;
+            }
+            break;
+        }
+    }
+    return inctx->rc;
+}
+
+/* Read a line of input from the SSL input layer into buffer BUF of
+ * length *LEN; updating *len to reflect the length of the line
+ * including the LF character. */
+static apr_status_t ssl_io_input_getline(bio_filter_in_ctx_t *inctx,
+                                         char *buf,
+                                         apr_size_t *len)
+{
+    const char *pos = NULL;
+    apr_status_t status;
+    apr_size_t tmplen = *len, buflen = *len, offset = 0;
+
+    *len = 0;
+
+    /*
+     * in most cases we get all the headers on the first SSL_read.
+     * however, in certain cases SSL_read will only get a partial
+     * chunk of the headers, so we try to read until LF is seen.
+     */
+
+    while (tmplen > 0) {
+        status = ssl_io_input_read(inctx, buf + offset, &tmplen);
+
+        if (status != APR_SUCCESS) {
+            if (APR_STATUS_IS_EAGAIN(status) && (*len > 0)) {
+                /* Save the part of the line we already got */
+                char_buffer_write(&inctx->cbuf, buf, *len);
+            }
+            return status;
+        }
+
+        *len += tmplen;
+
+        if ((pos = memchr(buf, APR_ASCII_LF, *len))) {
+            break;
+        }
+
+        offset += tmplen;
+        tmplen = buflen - offset;
+    }
+
+    if (pos) {
+        char *value;
+        int length;
+        apr_size_t bytes = pos - buf;
+
+        bytes += 1;
+        value = buf + bytes;
+        length = *len - bytes;
+
+        char_buffer_write(&inctx->cbuf, value, length);
+
+        *len = bytes;
+    }
+
+    return APR_SUCCESS;
+}
+
+
+static apr_status_t ssl_filter_write(ap_filter_t *f,
+                                     const char *data,
+                                     apr_size_t len)
+{
+    ssl_filter_ctx_t *filter_ctx = f->ctx;
+    bio_filter_out_ctx_t *outctx;
+    int res;
+
+    /* write SSL */
+    if (filter_ctx->pssl == NULL) {
+        return APR_EGENERAL;
+    }
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, f->c,
+                  "ssl_filter_write: %"APR_SIZE_T_FMT" bytes", len);
+
+    /* We rely on SSL_get_error() after the write, which requires an empty error
+     * queue before the write in order to work properly.
+     */
+    ERR_clear_error();
+
+    outctx = (bio_filter_out_ctx_t *)BIO_get_data(filter_ctx->pbioWrite);
+    res = SSL_write(filter_ctx->pssl, (unsigned char *)data, len);
+
+    if (res < 0) {
+        int ssl_err = SSL_get_error(filter_ctx->pssl, res);
+        conn_rec *c = (conn_rec*)SSL_get_app_data(outctx->filter_ctx->pssl);
+
+        if (ssl_err == SSL_ERROR_WANT_WRITE) {
+            /*
+             * If OpenSSL wants to write more, and we were nonblocking,
+             * report as an EAGAIN.  Otherwise loop, pushing more
+             * data at the network filter.
+             *
+             * (This is usually the case when the client forces an SSL
+             * renegotiation which is handled implicitly by OpenSSL.)
+             */
+            outctx->rc = APR_EAGAIN;
+        }
+        else if (ssl_err == SSL_ERROR_WANT_READ) {
+            /*
+             * If OpenSSL wants to read during write, and we were
+             * nonblocking, set the sense explicitly to read and
+             * report as an EAGAIN.
+             *
+             * (This is usually the case when the client forces an SSL
+             * renegotiation which is handled implicitly by OpenSSL.)
+             */
+            outctx->c->cs->sense = CONN_SENSE_WANT_READ;
+            outctx->rc = APR_EAGAIN;
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, outctx->c,
+                          "Want read during nonblocking write");
+        }
+        else if (ssl_err == SSL_ERROR_SYSCALL) {
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, outctx->rc, c, APLOGNO(01993)
+                          "SSL output filter write failed.");
+        }
+        else /* if (ssl_err == SSL_ERROR_SSL) */ {
+            /*
+             * Log SSL errors
+             */
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, outctx->rc, c, APLOGNO(01994)
+                          "SSL library error %d writing data", ssl_err);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, mySrvFromConn(c));
+        }
+        if (outctx->rc == APR_SUCCESS) {
+            outctx->rc = APR_EGENERAL;
+        }
+    }
+    else if ((apr_size_t)res != len) {
+        conn_rec *c = f->c;
+        char *reason = "reason unknown";
+
+        /* XXX: probably a better way to determine this */
+        if (SSL_total_renegotiations(filter_ctx->pssl)) {
+            reason = "likely due to failed renegotiation";
+        }
+
+        ap_log_cerror(APLOG_MARK, APLOG_INFO, outctx->rc, c, APLOGNO(01995)
+                      "failed to write %" APR_SSIZE_T_FMT
+                      " of %" APR_SIZE_T_FMT " bytes (%s)",
+                      len - (apr_size_t)res, len, reason);
+
+        outctx->rc = APR_EGENERAL;
+    }
+    return outctx->rc;
+}
+
+/* Just use a simple request.  Any request will work for this, because
+ * we use a flag in the conn_rec->conn_vector now.  The fake request just
+ * gets the request back to the Apache core so that a response can be sent.
+ * Since we use an HTTP/1.x request, we also have to inject the empty line
+ * that terminates the headers, or the core will read more data from the
+ * socket.
+ */
+#define HTTP_ON_HTTPS_PORT \
+    "GET / HTTP/1.0" CRLF
+
+#define HTTP_ON_HTTPS_PORT_BUCKET(alloc) \
+    apr_bucket_immortal_create(HTTP_ON_HTTPS_PORT, \
+                               sizeof(HTTP_ON_HTTPS_PORT) - 1, \
+                               alloc)
+
+/* Custom apr_status_t error code, used when a plain HTTP request is
+ * received on an SSL port. */
+#define MODSSL_ERROR_HTTP_ON_HTTPS (APR_OS_START_USERERR + 0)
+
+/* Custom apr_status_t error code, used when the proxy cannot
+ * establish an outgoing SSL connection. */
+#define MODSSL_ERROR_BAD_GATEWAY (APR_OS_START_USERERR + 1)
+
+static void ssl_io_filter_disable(SSLConnRec *sslconn,
+                                  bio_filter_in_ctx_t *inctx)
+{
+    SSL_free(inctx->ssl);
+    sslconn->ssl = NULL;
+    inctx->ssl = NULL;
+    inctx->filter_ctx->pssl = NULL;
+}
+
+static apr_status_t ssl_io_filter_error(bio_filter_in_ctx_t *inctx,
+                                        apr_bucket_brigade *bb,
+                                        apr_status_t status,
+                                        int is_init)
+{
+    ap_filter_t *f = inctx->f;
+    SSLConnRec *sslconn = myConnConfig(f->c);
+    apr_bucket *bucket;
+    int send_eos = 1;
+
+    switch (status) {
+    case MODSSL_ERROR_HTTP_ON_HTTPS:
+            /* log the situation */
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, f->c, APLOGNO(01996)
+                         "SSL handshake failed: HTTP spoken on HTTPS port; "
+                         "trying to send HTML error page");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, sslconn->server);
+
+            ssl_io_filter_disable(sslconn, inctx);
+            f->c->keepalive = AP_CONN_CLOSE;
+            if (is_init) {
+                sslconn->non_ssl_request = NON_SSL_SEND_REQLINE;
+                return APR_EGENERAL;
+            }
+            sslconn->non_ssl_request = NON_SSL_SEND_HDR_SEP;
+
+            /* fake the request line */
+            bucket = HTTP_ON_HTTPS_PORT_BUCKET(f->c->bucket_alloc);
+            send_eos = 0;
+            break;
+
+    case MODSSL_ERROR_BAD_GATEWAY:
+        ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, f->c, APLOGNO(01997)
+                      "SSL handshake failed: sending 502");
+        f->c->aborted = 1;
+        return APR_EGENERAL;
+
+    default:
+        return status;
+    }
+
+    APR_BRIGADE_INSERT_TAIL(bb, bucket);
+    if (send_eos) {
+        bucket = apr_bucket_eos_create(f->c->bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(bb, bucket);
+    }
+    return APR_SUCCESS;
+}
+
+static const char ssl_io_filter[] = "SSL/TLS Filter";
+static const char ssl_io_buffer[] = "SSL/TLS Buffer";
+static const char ssl_io_coalesce[] = "SSL/TLS Coalescing Filter";
+
+/*
+ *  Close the SSL part of the socket connection
+ *  (called immediately _before_ the socket is closed)
+ *  or called with
+ */
+static void ssl_filter_io_shutdown(ssl_filter_ctx_t *filter_ctx,
+                                   conn_rec *c, int abortive)
+{
+    SSL *ssl = filter_ctx->pssl;
+    const char *type = "";
+    SSLConnRec *sslconn = myConnConfig(c);
+    int shutdown_type;
+    int loglevel = APLOG_DEBUG;
+    const char *logno;
+
+    if (!ssl) {
+        return;
+    }
+
+    /*
+     * Now close the SSL layer of the connection. We've to take
+     * the TLSv1 standard into account here:
+     *
+     * | 7.2.1. Closure alerts
+     * |
+     * | The client and the server must share knowledge that the connection is
+     * | ending in order to avoid a truncation attack. Either party may
+     * | initiate the exchange of closing messages.
+     * |
+     * | close_notify
+     * |     This message notifies the recipient that the sender will not send
+     * |     any more messages on this connection. The session becomes
+     * |     unresumable if any connection is terminated without proper
+     * |     close_notify messages with level equal to warning.
+     * |
+     * | Either party may initiate a close by sending a close_notify alert.
+     * | Any data received after a closure alert is ignored.
+     * |
+     * | Each party is required to send a close_notify alert before closing
+     * | the write side of the connection. It is required that the other party
+     * | respond with a close_notify alert of its own and close down the
+     * | connection immediately, discarding any pending writes. It is not
+     * | required for the initiator of the close to wait for the responding
+     * | close_notify alert before closing the read side of the connection.
+     *
+     * This means we've to send a close notify message, but haven't to wait
+     * for the close notify of the client. Actually we cannot wait for the
+     * close notify of the client because some clients (including Netscape
+     * 4.x) don't send one, so we would hang.
+     */
+
+    /*
+     * exchange close notify messages, but allow the user
+     * to force the type of handshake via SetEnvIf directive
+     */
+    if (abortive) {
+        shutdown_type = SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN;
+        type = "abortive";
+        logno = APLOGNO(01998);
+        loglevel = APLOG_INFO;
+    }
+    else switch (sslconn->shutdown_type) {
+      case SSL_SHUTDOWN_TYPE_UNCLEAN:
+        /* perform no close notify handshake at all
+           (violates the SSL/TLS standard!) */
+        shutdown_type = SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN;
+        type = "unclean";
+        logno = APLOGNO(01999);
+        break;
+      case SSL_SHUTDOWN_TYPE_ACCURATE:
+        /* send close notify and wait for clients close notify
+           (standard compliant, but usually causes connection hangs) */
+        shutdown_type = 0;
+        type = "accurate";
+        logno = APLOGNO(02000);
+        break;
+      default:
+        /*
+         * case SSL_SHUTDOWN_TYPE_UNSET:
+         * case SSL_SHUTDOWN_TYPE_STANDARD:
+         */
+        /* send close notify, but don't wait for clients close notify
+           (standard compliant and safe, so it's the DEFAULT!) */
+        shutdown_type = SSL_RECEIVED_SHUTDOWN;
+        type = "standard";
+        logno = APLOGNO(02001);
+        break;
+    }
+
+    SSL_set_shutdown(ssl, shutdown_type);
+    modssl_smart_shutdown(ssl);
+
+    /* and finally log the fact that we've closed the connection */
+    if (APLOG_CS_IS_LEVEL(c, mySrvFromConn(c), loglevel)) {
+        /* Intentional no APLOGNO */
+        /* logno provides APLOGNO */
+        ap_log_cserror(APLOG_MARK, loglevel, 0, c, mySrvFromConn(c),
+                       "%sConnection closed to child %ld with %s shutdown "
+                       "(server %s)",
+                       logno, c->id, type,
+                       ssl_util_vhostid(c->pool, mySrvFromConn(c)));
+    }
+
+    /* deallocate the SSL connection */
+    if (sslconn->client_cert) {
+        X509_free(sslconn->client_cert);
+        sslconn->client_cert = NULL;
+    }
+    SSL_free(ssl);
+    sslconn->ssl = NULL;
+    filter_ctx->pssl = NULL; /* so filters know we've been shutdown */
+
+    if (abortive) {
+        /* prevent any further I/O */
+        c->aborted = 1;
+    }
+}
+
+static apr_status_t ssl_io_filter_cleanup(void *data)
+{
+    ssl_filter_ctx_t *filter_ctx = data;
+
+    if (filter_ctx->pssl) {
+        conn_rec *c = (conn_rec *)SSL_get_app_data(filter_ctx->pssl);
+        SSLConnRec *sslconn = myConnConfig(c);
+
+        SSL_free(filter_ctx->pssl);
+        sslconn->ssl = filter_ctx->pssl = NULL;
+    }
+
+    return APR_SUCCESS;
+}
+
+/*
+ * The hook is NOT registered with ap_hook_process_connection. Instead, it is
+ * called manually from the churn () before it tries to read any data.
+ * There is some problem if I accept conn_rec *. Still investigating..
+ * Adv. if conn_rec * can be accepted is we can hook this function using the
+ * ap_hook_process_connection hook.
+ */
+
+/* Perform the SSL handshake (whether in client or server mode), if
+ * necessary, for the given connection. */
+static apr_status_t ssl_io_filter_handshake(ssl_filter_ctx_t *filter_ctx)
+{
+    conn_rec *c         = (conn_rec *)SSL_get_app_data(filter_ctx->pssl);
+    SSLConnRec *sslconn = myConnConfig(c);
+    SSLSrvConfigRec *sc;
+    X509 *cert;
+    int n;
+    int ssl_err;
+    long verify_result;
+    server_rec *server;
+
+    if (SSL_is_init_finished(filter_ctx->pssl)) {
+        return APR_SUCCESS;
+    }
+
+    server = sslconn->server;
+    if (c->outgoing) {
+#ifdef HAVE_TLSEXT
+        apr_ipsubnet_t *ip;
+#ifdef HAVE_TLS_ALPN
+        const char *alpn_note;
+        apr_array_header_t *alpn_proposed = NULL;
+        int alpn_empty_ok = 1;
+#endif
+#endif
+        const char *hostname_note = apr_table_get(c->notes,
+                                                  "proxy-request-hostname");
+        BOOL proxy_ssl_check_peer_ok = TRUE;
+        int post_handshake_rc = OK;
+        SSLDirConfigRec *dc;
+
+        dc = sslconn->dc;
+        sc = mySrvConfig(server);
+
+#ifdef HAVE_TLSEXT
+#ifdef HAVE_TLS_ALPN
+        alpn_note = apr_table_get(c->notes, "proxy-request-alpn-protos");
+        if (alpn_note) {
+            char *protos, *s, *p, *last, *proto;
+            apr_size_t len;
+
+            /* Transform the note into a protocol formatted byte array:
+             * (len-byte proto-char+)*
+             * We need the remote server to agree on one of these, unless 'http/1.1'
+             * is also among our proposals. Because pre-ALPN remotes will speak this.
+             */
+            alpn_proposed = apr_array_make(c->pool, 3, sizeof(const char*));
+            alpn_empty_ok = 0;
+            s = protos = apr_pcalloc(c->pool, strlen(alpn_note)+1);
+            p = apr_pstrdup(c->pool, alpn_note);
+            while ((p = apr_strtok(p, ", ", &last))) {
+                len = last - p - (*last? 1 : 0); 
+                if (len > 255) {
+                    ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03309)
+                                  "ALPN proxy protocol identifier too long: %s",
+                                  p);
+                    ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, server);
+                    return APR_EGENERAL;
+                }
+                proto = apr_pstrndup(c->pool, p, len);
+                APR_ARRAY_PUSH(alpn_proposed, const char*) = proto;
+                if (!strcmp("http/1.1", proto)) {
+                    alpn_empty_ok = 1;
+                }
+                *s++ = (unsigned char)len;
+                while (len--) {
+                    *s++ = *p++;
+                }
+                p = NULL;
+            }
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c, 
+                          "setting alpn protos from '%s', protolen=%d", 
+                          alpn_note, (int)(s - protos));
+            if (protos != s && SSL_set_alpn_protos(filter_ctx->pssl, 
+                                                   (unsigned char *)protos, 
+                                                   s - protos)) {
+                ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(03310)
+                              "error setting alpn protos from '%s'", alpn_note);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_WARNING, server);
+                /* If ALPN was requested and we cannot do it, we must fail */
+                return MODSSL_ERROR_BAD_GATEWAY;
+            }
+        }
+#endif /* defined HAVE_TLS_ALPN */
+        /*
+         * Enable SNI for backend requests. Make sure we don't do it for
+         * pure SSLv3 connections, and also prevent IP addresses
+         * from being included in the SNI extension. (OpenSSL would simply
+         * pass them on, but RFC 6066 is quite clear on this: "Literal
+         * IPv4 and IPv6 addresses are not permitted".)
+         */
+        if (hostname_note &&
+#ifndef OPENSSL_NO_SSL3
+            dc->proxy->protocol != SSL_PROTOCOL_SSLV3 &&
+#endif
+            apr_ipsubnet_create(&ip, hostname_note, NULL,
+                                c->pool) != APR_SUCCESS) {
+            if (SSL_set_tlsext_host_name(filter_ctx->pssl, hostname_note)) {
+                ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                              "SNI extension for SSL Proxy request set to '%s'",
+                              hostname_note);
+            } else {
+                ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(02002)
+                              "Failed to set SNI extension for SSL Proxy "
+                              "request to '%s'", hostname_note);
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_WARNING, server);
+            }
+        }
+#endif /* defined HAVE_TLSEXT */
+
+        if ((n = SSL_connect(filter_ctx->pssl)) <= 0) {
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02003)
+                          "SSL Proxy connect failed");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, server);
+            /* ensure that the SSL structures etc are freed, etc: */
+            ssl_filter_io_shutdown(filter_ctx, c, 1);
+            apr_table_setn(c->notes, "SSL_connect_rv", "err");
+            return MODSSL_ERROR_BAD_GATEWAY;
+        }
+
+        cert = SSL_get_peer_certificate(filter_ctx->pssl);
+
+        if (dc->proxy->ssl_check_peer_expire != FALSE) {
+            if (!cert
+                || (X509_cmp_current_time(
+                     X509_get_notBefore(cert)) >= 0)
+                || (X509_cmp_current_time(
+                     X509_get_notAfter(cert)) <= 0)) {
+                proxy_ssl_check_peer_ok = FALSE;
+                ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02004)
+                              "SSL Proxy: Peer certificate is expired");
+            }
+        }
+        if ((dc->proxy->ssl_check_peer_name != FALSE) &&
+            ((dc->proxy->ssl_check_peer_cn != FALSE) ||
+             (dc->proxy->ssl_check_peer_name == TRUE)) &&
+            hostname_note) {
+            if (!cert
+                || modssl_X509_match_name(c->pool, cert, hostname_note,
+                                          TRUE, server) == FALSE) {
+                proxy_ssl_check_peer_ok = FALSE;
+                ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02411)
+                              "SSL Proxy: Peer certificate does not match "
+                              "for hostname %s", hostname_note);
+            }
+        }
+        else if ((dc->proxy->ssl_check_peer_cn == TRUE) &&
+            hostname_note) {
+            const char *hostname;
+            int match = 0;
+
+            hostname = ssl_var_lookup(NULL, server, c, NULL,
+                                      "SSL_CLIENT_S_DN_CN");
+
+            /* Do string match or simplest wildcard match if that
+             * fails. */
+            match = strcasecmp(hostname, hostname_note) == 0;
+            if (!match && strncmp(hostname, "*.", 2) == 0) {
+                const char *p = ap_strchr_c(hostname_note, '.');
+                
+                match = p && strcasecmp(p, hostname + 1) == 0;
+            }
+
+            if (!match) {
+                proxy_ssl_check_peer_ok = FALSE;
+                ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02005)
+                              "SSL Proxy: Peer certificate CN mismatch:"
+                              " Certificate CN: %s Requested hostname: %s",
+                              hostname, hostname_note);
+            }
+        }
+
+#ifdef HAVE_TLS_ALPN
+        /* If we proposed ALPN protocol(s), we need to check if the server
+         * agreed to one of them. While <https://www.rfc-editor.org/rfc/rfc7301.txt>
+         * chapter 3.2 says the server SHALL error the handshake in such a case,
+         * the reality is that some servers fall back to their default, e.g. http/1.1.
+         * (we also do this right now)
+         * We need to treat this as an error for security reasons.
+         */
+        if (alpn_proposed && alpn_proposed->nelts > 0) {
+            const char *selected;
+            unsigned int slen;
+
+            SSL_get0_alpn_selected(filter_ctx->pssl, (const unsigned char**)&selected, &slen);
+            if (!selected || !slen) {
+                /* No ALPN selection reported by the remote server. This could mean
+                 * it does not support ALPN (old server) or that it does not support
+                 * any of our proposals (Apache itself up to 2.4.48 at least did that). */
+               if (!alpn_empty_ok) {
+                    ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(10273)
+                                  "SSL Proxy: Peer did not select any of our ALPN protocols [%s].",
+                                  alpn_note);
+                    proxy_ssl_check_peer_ok = FALSE;
+               }
+            }
+            else {
+                const char *proto;
+                int i, found = 0;
+                for (i = 0; !found && i < alpn_proposed->nelts; ++i) {
+                    proto = APR_ARRAY_IDX(alpn_proposed, i, const char *);
+                    found = !strncmp(selected, proto, slen);
+                }
+                if (!found) {
+                    /* From a conforming peer, this should never happen,
+                     * but life always finds a way... */
+                    proto = apr_pstrndup(c->pool, selected, slen);
+                    ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(10274)
+                                  "SSL Proxy: Peer proposed ALPN protocol %s which is none "
+                                  "of our proposals [%s].", proto, alpn_note);
+                    proxy_ssl_check_peer_ok = FALSE;
+                }
+            }
+        }
+#endif
+
+        if (proxy_ssl_check_peer_ok == TRUE) {
+            /* another chance to fail */
+            post_handshake_rc = ssl_run_proxy_post_handshake(c, filter_ctx->pssl);
+        }
+
+        if (cert) {
+            X509_free(cert);
+        }
+
+        if (proxy_ssl_check_peer_ok != TRUE
+            || (post_handshake_rc != OK && post_handshake_rc != DECLINED)) {
+            /* ensure that the SSL structures etc are freed, etc: */
+            ssl_filter_io_shutdown(filter_ctx, c, 1);
+            apr_table_setn(c->notes, "SSL_connect_rv", "err");
+            return MODSSL_ERROR_BAD_GATEWAY;
+        }
+
+        apr_table_setn(c->notes, "SSL_connect_rv", "ok");
+        return APR_SUCCESS;
+    }
+
+    /* We rely on SSL_get_error() after the accept, which requires an empty
+     * error queue before the accept in order to work properly.
+     */
+    ERR_clear_error();
+
+    if ((n = SSL_accept(filter_ctx->pssl)) <= 0) {
+        bio_filter_in_ctx_t *inctx = (bio_filter_in_ctx_t *)
+                                     BIO_get_data(filter_ctx->pbioRead);
+        bio_filter_out_ctx_t *outctx = (bio_filter_out_ctx_t *)
+                                       BIO_get_data(filter_ctx->pbioWrite);
+        apr_status_t rc = inctx->rc ? inctx->rc : outctx->rc ;
+        ssl_err = SSL_get_error(filter_ctx->pssl, n);
+
+        if (ssl_err == SSL_ERROR_ZERO_RETURN) {
+            /*
+             * The case where the connection was closed before any data
+             * was transferred. That's not a real error and can occur
+             * sporadically with some clients.
+             */
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, rc, c, APLOGNO(02006)
+                         "SSL handshake stopped: connection was closed");
+        }
+        else if (ssl_err == SSL_ERROR_WANT_READ) {
+            /*
+             * This is in addition to what was present earlier. It is
+             * borrowed from openssl_state_machine.c [mod_tls].
+             * TBD.
+             */
+            outctx->rc = APR_EAGAIN;
+            return APR_EAGAIN;
+        }
+        else if (ERR_GET_LIB(ERR_peek_error()) == ERR_LIB_SSL &&
+                 ERR_GET_REASON(ERR_peek_error()) == SSL_R_HTTP_REQUEST) {
+            /*
+             * The case where OpenSSL has recognized a HTTP request:
+             * This means the client speaks plain HTTP on our HTTPS port.
+             * ssl_io_filter_error will disable the ssl filters when it
+             * sees this status code.
+             */
+            return MODSSL_ERROR_HTTP_ON_HTTPS;
+        }
+        else if (ssl_err == SSL_ERROR_SYSCALL) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rc, c, APLOGNO(02007)
+                          "SSL handshake interrupted by system "
+                          "[Hint: Stop button pressed in browser?!]");
+        }
+        else /* if (ssl_err == SSL_ERROR_SSL) */ {
+            /*
+             * Log SSL errors and any unexpected conditions.
+             */
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, rc, c, APLOGNO(02008)
+                          "SSL library error %d in handshake "
+                          "(server %s)", ssl_err,
+                          ssl_util_vhostid(c->pool, server));
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, server);
+
+        }
+        if (inctx->rc == APR_SUCCESS) {
+            inctx->rc = APR_EGENERAL;
+        }
+
+        ssl_filter_io_shutdown(filter_ctx, c, 1);
+        return inctx->rc;
+    }
+    sc = mySrvConfig(sslconn->server);
+
+    /*
+     * Check for failed client authentication
+     */
+    verify_result = SSL_get_verify_result(filter_ctx->pssl);
+
+    if ((verify_result != X509_V_OK) ||
+        sslconn->verify_error)
+    {
+        if (ssl_verify_error_is_optional(verify_result) &&
+            (sc->server->auth.verify_mode == SSL_CVERIFY_OPTIONAL_NO_CA))
+        {
+            /* leaving this log message as an error for the moment,
+             * according to the mod_ssl docs:
+             * "level optional_no_ca is actually against the idea
+             *  of authentication (but can be used to establish
+             * SSL test pages, etc.)"
+             * optional_no_ca doesn't appear to work as advertised
+             * in 1.x
+             */
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02009)
+                          "SSL client authentication failed, "
+                          "accepting certificate based on "
+                          "\"SSLVerifyClient optional_no_ca\" "
+                          "configuration");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, server);
+        }
+        else {
+            const char *error = sslconn->verify_error ?
+                sslconn->verify_error :
+                X509_verify_cert_error_string(verify_result);
+
+            ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02010)
+                         "SSL client authentication failed: %s",
+                         error ? error : "unknown");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_INFO, server);
+
+            ssl_filter_io_shutdown(filter_ctx, c, 1);
+            return APR_ECONNABORTED;
+        }
+    }
+
+    /*
+     * Remember the peer certificate's DN
+     */
+    if ((cert = SSL_get_peer_certificate(filter_ctx->pssl))) {
+        if (sslconn->client_cert) {
+            X509_free(sslconn->client_cert);
+        }
+        sslconn->client_cert = cert;
+        sslconn->client_dn = NULL;
+    }
+
+    /*
+     * Make really sure that when a peer certificate
+     * is required we really got one... (be paranoid)
+     */
+    if ((sc->server->auth.verify_mode == SSL_CVERIFY_REQUIRE) &&
+        !sslconn->client_cert)
+    {
+        ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02011)
+                      "No acceptable peer certificate available");
+
+        ssl_filter_io_shutdown(filter_ctx, c, 1);
+        return APR_ECONNABORTED;
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_io_filter_input(ap_filter_t *f,
+                                        apr_bucket_brigade *bb,
+                                        ap_input_mode_t mode,
+                                        apr_read_type_e block,
+                                        apr_off_t readbytes)
+{
+    apr_status_t status;
+    bio_filter_in_ctx_t *inctx = f->ctx;
+    const char *start = inctx->buffer; /* start of block to return */
+    apr_size_t len = sizeof(inctx->buffer); /* length of block to return */
+    int is_init = (mode == AP_MODE_INIT);
+    apr_bucket *bucket;
+
+    if (f->c->aborted) {
+        /* XXX: Ok, if we aborted, we ARE at the EOS.  We also have
+         * aborted.  This 'double protection' is probably redundant,
+         * but also effective against just about anything.
+         */
+        bucket = apr_bucket_eos_create(f->c->bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(bb, bucket);
+        return APR_ECONNABORTED;
+    }
+
+    if (!inctx->ssl) {
+        SSLConnRec *sslconn = myConnConfig(f->c);
+        if (sslconn->non_ssl_request == NON_SSL_SEND_REQLINE) {
+            bucket = HTTP_ON_HTTPS_PORT_BUCKET(f->c->bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(bb, bucket);
+            if (mode != AP_MODE_SPECULATIVE) {
+                sslconn->non_ssl_request = NON_SSL_SEND_HDR_SEP;
+            }
+            return APR_SUCCESS;
+        }
+        if (sslconn->non_ssl_request == NON_SSL_SEND_HDR_SEP) {
+            bucket = apr_bucket_immortal_create(CRLF, 2, f->c->bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(bb, bucket);
+            if (mode != AP_MODE_SPECULATIVE) {
+                sslconn->non_ssl_request = NON_SSL_SET_ERROR_MSG;
+            }
+            return APR_SUCCESS;
+        }
+        return ap_get_brigade(f->next, bb, mode, block, readbytes);
+    }
+
+    /* XXX: we don't currently support anything other than these modes. */
+    if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE &&
+        mode != AP_MODE_SPECULATIVE && mode != AP_MODE_INIT) {
+        return APR_ENOTIMPL;
+    }
+
+    inctx->mode = mode;
+    inctx->block = block;
+
+    /* XXX: we could actually move ssl_io_filter_handshake to an
+     * ap_hook_process_connection but would still need to call it for
+     * AP_MODE_INIT for protocols that may upgrade the connection
+     * rather than have SSLEngine On configured.
+     */
+    if ((status = ssl_io_filter_handshake(inctx->filter_ctx)) != APR_SUCCESS) {
+        return ssl_io_filter_error(inctx, bb, status, is_init);
+    }
+
+    if (is_init) {
+        /* protocol module needs to handshake before sending
+         * data to client (e.g. NNTP or FTP)
+         */
+        return APR_SUCCESS;
+    }
+
+    if (inctx->mode == AP_MODE_READBYTES ||
+        inctx->mode == AP_MODE_SPECULATIVE) {
+        /* Protected from truncation, readbytes < MAX_SIZE_T
+         * FIXME: No, it's *not* protected.  -- jre */
+        if (readbytes < len) {
+            len = (apr_size_t)readbytes;
+        }
+        status = ssl_io_input_read(inctx, inctx->buffer, &len);
+    }
+    else if (inctx->mode == AP_MODE_GETLINE) {
+        const char *pos;
+
+        /* Satisfy the read directly out of the buffer if possible;
+         * invoking ssl_io_input_getline will mean the entire buffer
+         * is copied once (unnecessarily) for each GETLINE call. */
+        if (inctx->cbuf.length
+            && (pos = memchr(inctx->cbuf.value, APR_ASCII_LF,
+                             inctx->cbuf.length)) != NULL) {
+            start = inctx->cbuf.value;
+            len = 1 + pos - start; /* +1 to include LF */
+            /* Buffer contents now consumed. */
+            inctx->cbuf.value += len;
+            inctx->cbuf.length -= len;
+            status = APR_SUCCESS;
+        }
+        else {
+            /* Otherwise fall back to the hard way. */
+            status = ssl_io_input_getline(inctx, inctx->buffer, &len);
+        }
+    }
+    else {
+        /* We have no idea what you are talking about, so return an error. */
+        status = APR_ENOTIMPL;
+    }
+
+    /* It is possible for mod_ssl's BIO to be used outside of the
+     * direct control of mod_ssl's input or output filter -- notably,
+     * when mod_ssl initiates a renegotiation.  Switching the BIO mode
+     * back to "blocking" here ensures such operations don't fail with
+     * SSL_ERROR_WANT_READ. */
+    inctx->block = APR_BLOCK_READ;
+
+    /* Handle custom errors. */
+    if (status != APR_SUCCESS) {
+        return ssl_io_filter_error(inctx, bb, status, 0);
+    }
+
+    /* Create a transient bucket out of the decrypted data. */
+    if (len > 0) {
+        bucket =
+            apr_bucket_transient_create(start, len, f->c->bucket_alloc);
+        APR_BRIGADE_INSERT_TAIL(bb, bucket);
+    }
+
+    return APR_SUCCESS;
+}
+
+
+/* ssl_io_filter_output() produces one SSL/TLS record per bucket
+ * passed down the output filter stack.  This results in a high
+ * overhead (more network packets & TLS processing) for any output
+ * comprising many small buckets.  SSI output passed through the HTTP
+ * chunk filter, for example, may produce many brigades containing
+ * small buckets - [chunk-size CRLF] [chunk-data] [CRLF].
+ *
+ * Sending HTTP response headers as a separate TLS record to the
+ * response body also reveals information to a network observer (the
+ * size of headers) which can be significant.
+ *
+ * The coalescing filter merges data buckets with the aim of producing
+ * fewer, larger TLS records - without copying/buffering all content
+ * and introducing unnecessary overhead.
+ *
+ * ### This buffering could be probably be done more comprehensively
+ * ### in ssl_io_filter_output itself. 
+ * 
+ * ### Another possible performance optimisation in particular for the
+ * ### [HEAP] [FILE] HTTP response case is using a brigade rather than
+ * ### a char array to buffer; using apr_brigade_write() to append
+ * ### will use already-allocated memory from the HEAP, reducing # of
+ * ### copies.
+ */
+
+#define COALESCE_BYTES (AP_IOBUFSIZE)
+
+struct coalesce_ctx {
+    char buffer[COALESCE_BYTES];
+    apr_size_t bytes; /* number of bytes of buffer used. */
+};
+
+static apr_status_t ssl_io_filter_coalesce(ap_filter_t *f,
+                                           apr_bucket_brigade *bb)
+{
+    apr_bucket *e, *upto;
+    apr_size_t bytes = 0;
+    struct coalesce_ctx *ctx = f->ctx;
+    apr_size_t buffered = ctx ? ctx->bytes : 0; /* space used on entry */
+    unsigned count = 0;
+
+    /* The brigade consists of zero-or-more small data buckets which
+     * can be coalesced (referred to as the "prefix"), followed by the
+     * remainder of the brigade.
+     *
+     * Find the last bucket - if any - of that prefix.  count gives
+     * the number of buckets in the prefix.  The "prefix" must contain
+     * only data buckets with known length, and must be of a total
+     * size which fits into the buffer.
+     *
+     * N.B.: The process here could be repeated throughout the brigade
+     * (coalesce any run of consecutive data buckets) but this would
+     * add significant complexity, particularly to memory
+     * management. */
+    for (e = APR_BRIGADE_FIRST(bb);
+         e != APR_BRIGADE_SENTINEL(bb)
+             && !APR_BUCKET_IS_METADATA(e)
+             && e->length != (apr_size_t)-1
+             && e->length <= COALESCE_BYTES
+             && (buffered + bytes + e->length) <= COALESCE_BYTES;
+         e = APR_BUCKET_NEXT(e)) {
+        /* don't count zero-length buckets */
+        if (e->length) {
+            bytes += e->length;
+            count++;
+        }
+    }
+
+    /* If there is room remaining and the next bucket is a data
+     * bucket, try to include it in the prefix to coalesce.  For a
+     * typical [HEAP] [FILE] HTTP response brigade, this handles
+     * merging the headers and the start of the body into a single TLS
+     * record. */
+    if (bytes + buffered > 0
+        && bytes + buffered < COALESCE_BYTES
+        && e != APR_BRIGADE_SENTINEL(bb)
+        && !APR_BUCKET_IS_METADATA(e)) {
+        apr_status_t rv = APR_SUCCESS;
+
+        /* For an indeterminate length bucket (PIPE/CGI/...), try a
+         * non-blocking read to have it morph into a HEAP.  If the
+         * read fails with EAGAIN, it is harmless to try a split
+         * anyway, split is ENOTIMPL for most PIPE-like buckets. */
+        if (e->length == (apr_size_t)-1) {
+            const char *discard;
+            apr_size_t ignore;
+
+            rv = apr_bucket_read(e, &discard, &ignore, APR_NONBLOCK_READ);
+            if (rv != APR_SUCCESS && !APR_STATUS_IS_EAGAIN(rv)) {
+                ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, f->c, APLOGNO(10232)
+                              "coalesce failed to read from %s bucket",
+                              e->type->name);
+                return AP_FILTER_ERROR;
+            }
+        }
+
+        if (rv == APR_SUCCESS) {
+            /* If the read above made the bucket morph, it may now fit
+             * entirely within the buffer.  Otherwise, split it so it does
+             * fit. */
+            if (e->length > COALESCE_BYTES
+                || e->length + buffered + bytes > COALESCE_BYTES) {
+                rv = apr_bucket_split(e, COALESCE_BYTES - (buffered + bytes));
+            }
+
+            if (rv == APR_SUCCESS && e->length == 0) {
+                /* As above, don't count in the prefix if the bucket is
+                 * now zero-length. */
+            }
+            else if (rv == APR_SUCCESS) {
+                ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, f->c,
+                              "coalesce: adding %" APR_SIZE_T_FMT " bytes "
+                              "from split %s bucket, total %" APR_SIZE_T_FMT,
+                              e->length, e->type->name, bytes + buffered);
+
+                count++;
+                bytes += e->length;
+                e = APR_BUCKET_NEXT(e);
+            }
+            else if (rv != APR_ENOTIMPL) {
+                ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, f->c, APLOGNO(10233)
+                              "coalesce: failed to split data bucket");
+                return AP_FILTER_ERROR;
+            }
+        }
+    }
+
+    /* The prefix is zero or more buckets.  upto now points to the
+     * bucket AFTER the end of the prefix, which may be the brigade
+     * sentinel. */
+    upto = e;
+
+    /* Coalesce the prefix, if any of the following are true:
+     * 
+     * a) the prefix is more than one bucket
+     * OR
+     * b) the prefix is the entire brigade, which is a single bucket
+     *    AND the prefix length is smaller than the buffer size,
+     * OR
+     * c) the prefix is a single bucket
+     *    AND there is buffered data from a previous pass.
+     * 
+     * The aim with (b) is to buffer a small bucket so it can be
+     * coalesced with future invocations of this filter.  e.g.  three
+     * calls each with a single 100 byte HEAP bucket should get
+     * coalesced together.  But an invocation with a 8192 byte HEAP
+     * should pass through untouched.
+     */
+    if (bytes > 0
+        && (count > 1
+            || (upto == APR_BRIGADE_SENTINEL(bb)
+                && bytes < COALESCE_BYTES)
+            || (ctx && ctx->bytes > 0))) {
+        /* If coalescing some bytes, ensure a context has been
+         * created. */
+        if (!ctx) {
+            f->ctx = ctx = apr_palloc(f->c->pool, sizeof *ctx);
+            ctx->bytes = 0;
+        }
+
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, f->c,
+                      "coalesce: have %" APR_SIZE_T_FMT " bytes, "
+                      "adding %" APR_SIZE_T_FMT " more (buckets=%u)",
+                      ctx->bytes, bytes, count);
+
+        /* Iterate through the prefix segment.  For non-fatal errors
+         * in this loop it is safe to break out and fall back to the
+         * normal path of sending the buffer + remaining buckets in
+         * brigade.  */
+        e = APR_BRIGADE_FIRST(bb);
+        while (e != upto) {
+            apr_size_t len;
+            const char *data;
+            apr_bucket *next;
+
+            if (APR_BUCKET_IS_METADATA(e)
+                || e->length == (apr_size_t)-1) {
+                ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(02012)
+                              "unexpected %s bucket during coalesce",
+                              e->type->name);
+                break; /* non-fatal error; break out */
+            }
+
+            if (e->length) {
+                apr_status_t rv;
+
+                /* A blocking read should be fine here for a
+                 * known-length data bucket, rather than the usual
+                 * non-block/flush/block.  */
+                rv = apr_bucket_read(e, &data, &len, APR_BLOCK_READ);
+                if (rv) {
+                    ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, f->c, APLOGNO(02013)
+                                  "coalesce failed to read from data bucket");
+                    return AP_FILTER_ERROR;
+                }
+
+                /* Be paranoid. */
+                if (len > sizeof ctx->buffer
+                    || (len + ctx->bytes > sizeof ctx->buffer)) {
+                    ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(02014)
+                                  "unexpected coalesced bucket data length");
+                    break; /* non-fatal error; break out */
+                }
+
+                memcpy(ctx->buffer + ctx->bytes, data, len);
+                ctx->bytes += len;
+            }
+
+            next = APR_BUCKET_NEXT(e);
+            apr_bucket_delete(e);
+            e = next;
+        }
+    }
+
+    if (APR_BRIGADE_EMPTY(bb)) {
+        /* If the brigade is now empty, our work here is done. */
+        return APR_SUCCESS;
+    }
+
+    /* If anything remains in the brigade, it must now be passed down
+     * the filter stack, first prepending anything that has been
+     * coalesced. */
+    if (ctx && ctx->bytes) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, f->c,
+                      "coalesce: passing on %" APR_SIZE_T_FMT " bytes", ctx->bytes);
+
+        e = apr_bucket_transient_create(ctx->buffer, ctx->bytes, bb->bucket_alloc);
+        APR_BRIGADE_INSERT_HEAD(bb, e);
+        ctx->bytes = 0; /* buffer now emptied. */
+    }
+
+    return ap_pass_brigade(f->next, bb);
+}
+
+static apr_status_t ssl_io_filter_output(ap_filter_t *f,
+                                         apr_bucket_brigade *bb)
+{
+    apr_status_t status = APR_SUCCESS;
+    ssl_filter_ctx_t *filter_ctx = f->ctx;
+    bio_filter_in_ctx_t *inctx;
+    bio_filter_out_ctx_t *outctx;
+    apr_read_type_e rblock = APR_NONBLOCK_READ;
+
+    if (f->c->aborted) {
+        apr_brigade_cleanup(bb);
+        return APR_ECONNABORTED;
+    }
+
+    if (!filter_ctx->pssl) {
+        /* ssl_filter_io_shutdown was called */
+        return ap_pass_brigade(f->next, bb);
+    }
+
+    inctx = (bio_filter_in_ctx_t *)BIO_get_data(filter_ctx->pbioRead);
+    outctx = (bio_filter_out_ctx_t *)BIO_get_data(filter_ctx->pbioWrite);
+
+    /* When we are the writer, we must initialize the inctx
+     * mode so that we block for any required ssl input, because
+     * output filtering is always nonblocking.
+     */
+    inctx->mode = AP_MODE_READBYTES;
+    inctx->block = APR_BLOCK_READ;
+
+    if ((status = ssl_io_filter_handshake(filter_ctx)) != APR_SUCCESS) {
+        return ssl_io_filter_error(inctx, bb, status, 0);
+    }
+
+    while (!APR_BRIGADE_EMPTY(bb) && status == APR_SUCCESS) {
+        apr_bucket *bucket = APR_BRIGADE_FIRST(bb);
+
+        if (APR_BUCKET_IS_METADATA(bucket)) {
+            /* Pass through metadata buckets untouched.  EOC is
+             * special; terminate the SSL layer first. */
+            if (AP_BUCKET_IS_EOC(bucket)) {
+                ssl_filter_io_shutdown(filter_ctx, f->c, 0);
+            }
+            AP_DEBUG_ASSERT(APR_BRIGADE_EMPTY(outctx->bb));
+
+            /* Metadata buckets are passed one per brigade; it might
+             * be more efficient (but also more complex) to use
+             * outctx->bb as a true buffer and interleave these with
+             * data buckets. */
+            APR_BUCKET_REMOVE(bucket);
+            APR_BRIGADE_INSERT_HEAD(outctx->bb, bucket);
+            status = ap_pass_brigade(f->next, outctx->bb);
+            if (status == APR_SUCCESS && f->c->aborted)
+                status = APR_ECONNRESET;
+            apr_brigade_cleanup(outctx->bb);
+        }
+        else {
+            /* Filter a data bucket. */
+            const char *data;
+            apr_size_t len;
+
+            status = apr_bucket_read(bucket, &data, &len, rblock);
+
+            if (APR_STATUS_IS_EAGAIN(status)) {
+                /* No data available: flush... */
+                if (bio_filter_out_flush(filter_ctx->pbioWrite) < 0) {
+                    status = outctx->rc;
+                    break;
+                }
+                rblock = APR_BLOCK_READ;
+                /* and try again with a blocking read. */
+                status = APR_SUCCESS;
+                continue;
+            }
+
+            rblock = APR_NONBLOCK_READ;
+
+            if (!APR_STATUS_IS_EOF(status) && (status != APR_SUCCESS)) {
+                break;
+            }
+
+            status = ssl_filter_write(f, data, len);
+            apr_bucket_delete(bucket);
+        }
+
+    }
+
+    return status;
+}
+
+struct modssl_buffer_ctx {
+    apr_bucket_brigade *bb;
+};
+
+int ssl_io_buffer_fill(request_rec *r, apr_size_t maxlen)
+{
+    conn_rec *c = r->connection;
+    struct modssl_buffer_ctx *ctx;
+    apr_bucket_brigade *tempb;
+    apr_off_t total = 0; /* total length buffered */
+    int eos = 0; /* non-zero once EOS is seen */
+
+    /* Create the context which will be passed to the input filter;
+     * containing a setaside pool and a brigade which constrain the
+     * lifetime of the buffered data. */
+    ctx = apr_palloc(r->pool, sizeof *ctx);
+    ctx->bb = apr_brigade_create(r->pool, c->bucket_alloc);
+
+    /* ... and a temporary brigade. */
+    tempb = apr_brigade_create(r->pool, c->bucket_alloc);
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, c, "filling buffer, max size "
+                  "%" APR_SIZE_T_FMT " bytes", maxlen);
+
+    do {
+        apr_status_t rv;
+        apr_bucket *e, *next;
+
+        /* The request body is read from the protocol-level input
+         * filters; the buffering filter will reinject it from that
+         * level, allowing content/resource filters to run later, if
+         * necessary. */
+
+        rv = ap_get_brigade(r->proto_input_filters, tempb, AP_MODE_READBYTES,
+                            APR_BLOCK_READ, 8192);
+        if (rv) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02015)
+                          "could not read request body for SSL buffer");
+            return ap_map_http_request_error(rv, HTTP_INTERNAL_SERVER_ERROR);
+        }
+
+        /* Iterate through the returned brigade: setaside each bucket
+         * into the context's pool and move it into the brigade. */
+        for (e = APR_BRIGADE_FIRST(tempb);
+             e != APR_BRIGADE_SENTINEL(tempb) && !eos; e = next) {
+            const char *data;
+            apr_size_t len;
+
+            next = APR_BUCKET_NEXT(e);
+
+            if (APR_BUCKET_IS_EOS(e)) {
+                eos = 1;
+            } else if (!APR_BUCKET_IS_METADATA(e)) {
+                rv = apr_bucket_read(e, &data, &len, APR_BLOCK_READ);
+                if (rv != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02016)
+                                  "could not read bucket for SSL buffer");
+                    return HTTP_INTERNAL_SERVER_ERROR;
+                }
+                total += len;
+            }
+
+            rv = apr_bucket_setaside(e, r->pool);
+            if (rv != APR_SUCCESS) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02017)
+                              "could not setaside bucket for SSL buffer");
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            APR_BUCKET_REMOVE(e);
+            APR_BRIGADE_INSERT_TAIL(ctx->bb, e);
+        }
+
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, c,
+                      "total of %" APR_OFF_T_FMT " bytes in buffer, eos=%d",
+                      total, eos);
+
+        /* Fail if this exceeds the maximum buffer size. */
+        if (total > maxlen) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02018)
+                          "request body exceeds maximum size (%" APR_SIZE_T_FMT
+                          ") for SSL buffer", maxlen);
+            return HTTP_REQUEST_ENTITY_TOO_LARGE;
+        }
+
+    } while (!eos);
+
+    apr_brigade_destroy(tempb);
+
+    /* After consuming all protocol-level input, remove all protocol-level
+     * filters.  It should strictly only be necessary to remove filters
+     * at exactly ftype == AP_FTYPE_PROTOCOL, since this filter will
+     * precede all > AP_FTYPE_PROTOCOL anyway. */
+    while (r->proto_input_filters->frec->ftype < AP_FTYPE_CONNECTION) {
+        ap_remove_input_filter(r->proto_input_filters);
+    }
+
+    /* Insert the filter which will supply the buffered content. */
+    ap_add_input_filter(ssl_io_buffer, ctx, r, c);
+
+    return 0;
+}
+
+/* This input filter supplies the buffered request body to the caller
+ * from the brigade stored in f->ctx.  Note that the placement of this
+ * filter in the filter stack is important; it must be the first
+ * r->proto_input_filter; lower-typed filters will not be preserved
+ * across internal redirects (see PR 43738).  */
+static apr_status_t ssl_io_filter_buffer(ap_filter_t *f,
+                                         apr_bucket_brigade *bb,
+                                         ap_input_mode_t mode,
+                                         apr_read_type_e block,
+                                         apr_off_t bytes)
+{
+    struct modssl_buffer_ctx *ctx = f->ctx;
+    apr_status_t rv;
+    apr_bucket *e, *d;
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, f->c,
+                  "read from buffered SSL brigade, mode %d, "
+                  "%" APR_OFF_T_FMT " bytes",
+                  mode, bytes);
+
+    if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE) {
+        return APR_ENOTIMPL;
+    }
+
+    if (APR_BRIGADE_EMPTY(ctx->bb)) {
+        /* Surprisingly (and perhaps, wrongly), the request body can be
+         * pulled from the input filter stack more than once; a
+         * handler may read it, and ap_discard_request_body() will
+         * attempt to do so again after *every* request.  So input
+         * filters must be prepared to give up an EOS if invoked after
+         * initially reading the request. The HTTP_IN filter does this
+         * with its ->eos_sent flag. */
+
+        APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_eos_create(f->c->bucket_alloc));
+        return APR_SUCCESS;
+    }
+
+    if (mode == AP_MODE_READBYTES) {
+        /* Partition the buffered brigade. */
+        rv = apr_brigade_partition(ctx->bb, bytes, &e);
+        if (rv && rv != APR_INCOMPLETE) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, f->c, APLOGNO(02019)
+                          "could not partition buffered SSL brigade");
+            ap_remove_input_filter(f);
+            return rv;
+        }
+
+        /* If the buffered brigade contains less then the requested
+         * length, just pass it all back. */
+        if (rv == APR_INCOMPLETE) {
+            APR_BRIGADE_CONCAT(bb, ctx->bb);
+        } else {
+            d = APR_BRIGADE_FIRST(ctx->bb);
+
+            e = APR_BUCKET_PREV(e);
+
+            /* Unsplice the partitioned segment and move it into the
+             * passed-in brigade; no convenient way to do this with
+             * the APR_BRIGADE_* macros. */
+            APR_RING_UNSPLICE(d, e, link);
+            APR_RING_SPLICE_HEAD(&bb->list, d, e, apr_bucket, link);
+
+            APR_BRIGADE_CHECK_CONSISTENCY(bb);
+            APR_BRIGADE_CHECK_CONSISTENCY(ctx->bb);
+        }
+    }
+    else {
+        /* Split a line into the passed-in brigade. */
+        rv = apr_brigade_split_line(bb, ctx->bb, block, bytes);
+
+        if (rv) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, f->c, APLOGNO(02020)
+                          "could not split line from buffered SSL brigade");
+            ap_remove_input_filter(f);
+            return rv;
+        }
+    }
+
+    if (APR_BRIGADE_EMPTY(ctx->bb)) {
+        e = APR_BRIGADE_LAST(bb);
+
+        /* Ensure that the brigade is terminated by an EOS if the
+         * buffered request body has been entirely consumed. */
+        if (e == APR_BRIGADE_SENTINEL(bb) || !APR_BUCKET_IS_EOS(e)) {
+            e = apr_bucket_eos_create(f->c->bucket_alloc);
+            APR_BRIGADE_INSERT_TAIL(bb, e);
+        }
+
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE4, 0, f->c,
+                      "buffered SSL brigade exhausted");
+        /* Note that the filter must *not* be removed here; it may be
+         * invoked again, see comment above. */
+    }
+
+    return APR_SUCCESS;
+}
+
+/* The request_rec pointer is passed in here only to ensure that the
+ * filter chain is modified correctly when doing a TLS upgrade.  It
+ * must *not* be used otherwise. */
+static void ssl_io_input_add_filter(ssl_filter_ctx_t *filter_ctx, conn_rec *c,
+                                    request_rec *r, SSL *ssl)
+{
+    bio_filter_in_ctx_t *inctx;
+
+    inctx = apr_palloc(c->pool, sizeof(*inctx));
+
+    filter_ctx->pInputFilter = ap_add_input_filter(ssl_io_filter, inctx, r, c);
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    filter_ctx->pbioRead = BIO_new(&bio_filter_in_method);
+#else
+    filter_ctx->pbioRead = BIO_new(bio_filter_in_method);
+#endif
+    BIO_set_data(filter_ctx->pbioRead, (void *)inctx);
+
+    inctx->ssl = ssl;
+    inctx->bio_out = filter_ctx->pbioWrite;
+    inctx->f = filter_ctx->pInputFilter;
+    inctx->rc = APR_SUCCESS;
+    inctx->mode = AP_MODE_READBYTES;
+    inctx->cbuf.length = 0;
+    inctx->bb = apr_brigade_create(c->pool, c->bucket_alloc);
+    inctx->block = APR_BLOCK_READ;
+    inctx->pool = c->pool;
+    inctx->filter_ctx = filter_ctx;
+}
+
+/* The request_rec pointer is passed in here only to ensure that the
+ * filter chain is modified correctly when doing a TLS upgrade.  It
+ * must *not* be used otherwise. */
+void ssl_io_filter_init(conn_rec *c, request_rec *r, SSL *ssl)
+{
+    ssl_filter_ctx_t *filter_ctx;
+
+    filter_ctx = apr_palloc(c->pool, sizeof(ssl_filter_ctx_t));
+
+    filter_ctx->config          = myConnConfig(c);
+
+    ap_add_output_filter(ssl_io_coalesce, NULL, r, c);
+
+    filter_ctx->pOutputFilter   = ap_add_output_filter(ssl_io_filter,
+                                                       filter_ctx, r, c);
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+    filter_ctx->pbioWrite       = BIO_new(&bio_filter_out_method);
+#else
+    filter_ctx->pbioWrite       = BIO_new(bio_filter_out_method);
+#endif
+    BIO_set_data(filter_ctx->pbioWrite, (void *)bio_filter_out_ctx_new(filter_ctx, c));
+
+    /* write is non blocking for the benefit of async mpm */
+    if (c->cs) {
+        BIO_set_nbio(filter_ctx->pbioWrite, 1);
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE6, 0, c,
+                      "Enabling non-blocking writes");
+    }
+
+    ssl_io_input_add_filter(filter_ctx, c, r, ssl);
+
+    SSL_set_bio(ssl, filter_ctx->pbioRead, filter_ctx->pbioWrite);
+    filter_ctx->pssl            = ssl;
+
+    apr_pool_cleanup_register(c->pool, (void*)filter_ctx,
+                              ssl_io_filter_cleanup, apr_pool_cleanup_null);
+
+    if (APLOG_CS_IS_LEVEL(c, mySrvFromConn(c), APLOG_TRACE4)) {
+        BIO *rbio = SSL_get_rbio(ssl),
+            *wbio = SSL_get_wbio(ssl);
+        BIO_set_callback(rbio, ssl_io_data_cb);
+        BIO_set_callback_arg(rbio, (void *)ssl);
+        if (wbio && wbio != rbio) {
+            BIO_set_callback(wbio, ssl_io_data_cb);
+            BIO_set_callback_arg(wbio, (void *)ssl);
+        }
+    }
+
+    return;
+}
+
+void ssl_io_filter_register(apr_pool_t *p)
+{
+    ap_register_input_filter  (ssl_io_filter, ssl_io_filter_input,  NULL, AP_FTYPE_CONNECTION + 5);
+    ap_register_output_filter (ssl_io_coalesce, ssl_io_filter_coalesce, NULL, AP_FTYPE_CONNECTION + 4);
+    ap_register_output_filter (ssl_io_filter, ssl_io_filter_output, NULL, AP_FTYPE_CONNECTION + 5);
+
+    ap_register_input_filter  (ssl_io_buffer, ssl_io_filter_buffer, NULL, AP_FTYPE_PROTOCOL);
+
+    return;
+}
+
+/*  _________________________________________________________________
+**
+**  I/O Data Debugging
+**  _________________________________________________________________
+*/
+
+#define DUMP_WIDTH 16
+
+static void ssl_io_data_dump(conn_rec *c, server_rec *s,
+                             const char *b, long len)
+{
+    char buf[256];
+    int i, j, rows, trunc, pos;
+    unsigned char ch;
+
+    trunc = 0;
+    for (; (len > 0) && ((b[len-1] == ' ') || (b[len-1] == '\0')); len--)
+        trunc++;
+    rows = (len / DUMP_WIDTH);
+    if ((rows * DUMP_WIDTH) < len)
+        rows++;
+    ap_log_cserror(APLOG_MARK, APLOG_TRACE7, 0, c, s,
+            "+-------------------------------------------------------------------------+");
+    for (i = 0 ; i < rows; i++) {
+#if APR_CHARSET_EBCDIC
+        char ebcdic_text[DUMP_WIDTH];
+        j = DUMP_WIDTH;
+        if ((i * DUMP_WIDTH + j) > len)
+            j = len % DUMP_WIDTH;
+        if (j == 0)
+            j = DUMP_WIDTH;
+        memcpy(ebcdic_text,(char *)(b) + i * DUMP_WIDTH, j);
+        ap_xlate_proto_from_ascii(ebcdic_text, j);
+#endif /* APR_CHARSET_EBCDIC */
+        pos = 0;
+        pos += apr_snprintf(buf, sizeof(buf)-pos, "| %04x: ", i * DUMP_WIDTH);
+        for (j = 0; j < DUMP_WIDTH; j++) {
+            if (((i * DUMP_WIDTH) + j) >= len)
+                pos += apr_snprintf(buf+pos, sizeof(buf)-pos, "   ");
+            else {
+                ch = ((unsigned char)*((char *)(b) + i * DUMP_WIDTH + j)) & 0xff;
+                pos += apr_snprintf(buf+pos, sizeof(buf)-pos, "%02x%c", ch , j==7 ? '-' : ' ');
+            }
+        }
+        pos += apr_snprintf(buf+pos, sizeof(buf)-pos, " ");
+        for (j = 0; j < DUMP_WIDTH; j++) {
+            if (((i * DUMP_WIDTH) + j) >= len)
+                pos += apr_snprintf(buf+pos, sizeof(buf)-pos, " ");
+            else {
+                ch = ((unsigned char)*((char *)(b) + i * DUMP_WIDTH + j)) & 0xff;
+#if APR_CHARSET_EBCDIC
+                pos += apr_snprintf(buf+pos, sizeof(buf)-pos, "%c", (ch >= 0x20 && ch <= 0x7F) ? ebcdic_text[j] : '.');
+#else /* APR_CHARSET_EBCDIC */
+                pos += apr_snprintf(buf+pos, sizeof(buf)-pos, "%c", ((ch >= ' ') && (ch <= '~')) ? ch : '.');
+#endif /* APR_CHARSET_EBCDIC */
+            }
+        }
+        pos += apr_snprintf(buf+pos, sizeof(buf)-pos, " |");
+        ap_log_cserror(APLOG_MARK, APLOG_TRACE7, 0, c, s, "%s", buf);
+    }
+    if (trunc > 0)
+        ap_log_cserror(APLOG_MARK, APLOG_TRACE7, 0, c, s,
+                "| %04ld - <SPACES/NULS>", len + trunc);
+    ap_log_cserror(APLOG_MARK, APLOG_TRACE7, 0, c, s,
+            "+-------------------------------------------------------------------------+");
+}
+
+long ssl_io_data_cb(BIO *bio, int cmd,
+                    const char *argp,
+                    int argi, long argl, long rc)
+{
+    SSL *ssl;
+    conn_rec *c;
+    server_rec *s;
+
+    if ((ssl = (SSL *)BIO_get_callback_arg(bio)) == NULL)
+        return rc;
+    if ((c = (conn_rec *)SSL_get_app_data(ssl)) == NULL)
+        return rc;
+    s = mySrvFromConn(c);
+
+    if (   cmd == (BIO_CB_WRITE|BIO_CB_RETURN)
+        || cmd == (BIO_CB_READ |BIO_CB_RETURN) ) {
+        if (rc >= 0) {
+            const char *dump = "";
+            if (APLOG_CS_IS_LEVEL(c, s, APLOG_TRACE7)) {
+                if (argp != NULL)
+                    dump = "(BIO dump follows)";
+                else
+                    dump = "(Oops, no memory buffer?)";
+            }
+            ap_log_cserror(APLOG_MARK, APLOG_TRACE4, 0, c, s,
+                    "%s: %s %ld/%d bytes %s BIO#%pp [mem: %pp] %s",
+                    MODSSL_LIBRARY_NAME,
+                    (cmd == (BIO_CB_WRITE|BIO_CB_RETURN) ? "write" : "read"),
+                    rc, argi, (cmd == (BIO_CB_WRITE|BIO_CB_RETURN) ? "to" : "from"),
+                    bio, argp, dump);
+            if (*dump != '\0' && argp != NULL)
+                ssl_io_data_dump(c, s, argp, rc);
+        }
+        else {
+            ap_log_cserror(APLOG_MARK, APLOG_TRACE4, 0, c, s,
+                    "%s: I/O error, %d bytes expected to %s on BIO#%pp [mem: %pp]",
+                    MODSSL_LIBRARY_NAME, argi,
+                    (cmd == (BIO_CB_WRITE|BIO_CB_RETURN) ? "write" : "read"),
+                    bio, argp);
+        }
+    }
+    return rc;
+}
diff --git a/modules/ssl/ssl_engine_kernel.c b/modules/ssl/ssl_engine_kernel.c
new file mode 100644
index 0000000..591f6ae
--- /dev/null
+++ b/modules/ssl/ssl_engine_kernel.c
@@ -0,0 +1,2855 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_kernel.c
+ *  The SSL engine kernel
+ */
+                             /* ``It took me fifteen years to discover
+                                  I had no talent for programming, but
+                                  I couldn't give it up because by that
+                                  time I was too famous.''
+                                            -- Unknown                */
+#include "ssl_private.h"
+#include "mod_ssl.h"
+#include "util_md5.h"
+#include "scoreboard.h"
+
+static void ssl_configure_env(request_rec *r, SSLConnRec *sslconn);
+#ifdef HAVE_TLSEXT
+static int ssl_find_vhost(void *servername, conn_rec *c, server_rec *s);
+#endif
+
+#define SWITCH_STATUS_LINE "HTTP/1.1 101 Switching Protocols"
+#define UPGRADE_HEADER "Upgrade: TLS/1.0, HTTP/1.1"
+#define CONNECTION_HEADER "Connection: Upgrade"
+
+/* Perform an upgrade-to-TLS for the given request, per RFC 2817. */
+static apr_status_t upgrade_connection(request_rec *r)
+{
+    struct conn_rec *conn = r->connection;
+    apr_bucket_brigade *bb;
+    SSLConnRec *sslconn;
+    apr_status_t rv;
+    SSL *ssl;
+
+    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02028)
+                  "upgrading connection to TLS");
+
+    bb = apr_brigade_create(r->pool, conn->bucket_alloc);
+
+    rv = ap_fputs(conn->output_filters, bb, SWITCH_STATUS_LINE CRLF
+                  UPGRADE_HEADER CRLF CONNECTION_HEADER CRLF CRLF);
+    if (rv == APR_SUCCESS) {
+        APR_BRIGADE_INSERT_TAIL(bb,
+                                apr_bucket_flush_create(conn->bucket_alloc));
+        rv = ap_pass_brigade(conn->output_filters, bb);
+    }
+
+    if (rv) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02029)
+                      "failed to send 101 interim response for connection "
+                      "upgrade");
+        return rv;
+    }
+
+    ssl_init_ssl_connection(conn, r);
+
+    sslconn = myConnConfig(conn);
+    ssl = sslconn->ssl;
+
+    /* Perform initial SSL handshake. */
+    SSL_set_accept_state(ssl);
+    SSL_do_handshake(ssl);
+
+    if (!SSL_is_init_finished(ssl)) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02030)
+                      "TLS upgrade handshake failed");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+
+        return APR_ECONNABORTED;
+    }
+
+    return APR_SUCCESS;
+}
+
+/* Perform a speculative (and non-blocking) read from the connection
+ * filters for the given request, to determine whether there is any
+ * pending data to read.  Return non-zero if there is, else zero. */
+static int has_buffered_data(request_rec *r)
+{
+    apr_bucket_brigade *bb;
+    apr_off_t len;
+    apr_status_t rv;
+    int result;
+
+    bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
+
+    rv = ap_get_brigade(r->connection->input_filters, bb, AP_MODE_SPECULATIVE,
+                        APR_NONBLOCK_READ, 1);
+    result = rv == APR_SUCCESS
+        && apr_brigade_length(bb, 1, &len) == APR_SUCCESS
+        && len > 0;
+
+    apr_brigade_destroy(bb);
+
+    return result;
+}
+
+/* If a renegotiation is required for the location, and the request
+ * includes a message body (and the client has not requested a "100
+ * Continue" response), then the client will be streaming the request
+ * body over the wire already.  In that case, it is not possible to
+ * stop and perform a new SSL handshake immediately; once the SSL
+ * library moves to the "accept" state, it will reject the SSL packets
+ * which the client is sending for the request body.
+ *
+ * To allow authentication to complete in the hook, the solution used
+ * here is to fill a (bounded) buffer with the request body, and then
+ * to reinject that request body later.
+ *
+ * This function is called to fill the renegotiation buffer for the
+ * location as required, or fail.  Returns zero on success or HTTP_
+ * error code on failure.
+ */
+static int fill_reneg_buffer(request_rec *r, SSLDirConfigRec *dc)
+{
+    int rv;
+    apr_size_t rsize;
+
+    /* ### this is HTTP/1.1 specific, special case for protocol? */
+    if (r->expecting_100 || !ap_request_has_body(r)) {
+        return 0;
+    }
+
+    rsize = dc->nRenegBufferSize == UNSET ? DEFAULT_RENEG_BUFFER_SIZE : dc->nRenegBufferSize;
+    if (rsize > 0) {
+        /* Fill the I/O buffer with the request body if possible. */
+        rv = ssl_io_buffer_fill(r, rsize);
+    }
+    else {
+        /* If the reneg buffer size is set to zero, just fail. */
+        rv = HTTP_REQUEST_ENTITY_TOO_LARGE;
+    }
+
+    return rv;
+}
+
+#ifdef HAVE_TLSEXT
+static int ap_array_same_str_set(apr_array_header_t *s1, apr_array_header_t *s2)
+{
+    int i;
+    const char *c;
+    
+    if (s1 == s2) {
+        return 1;
+    }
+    else if (!s1 || !s2 || (s1->nelts != s2->nelts)) {
+        return 0;
+    }
+    
+    for (i = 0; i < s1->nelts; i++) {
+        c = APR_ARRAY_IDX(s1, i, const char *);
+        if (!c || !ap_array_str_contains(s2, c)) {
+            return 0;
+        }
+    }
+    return 1;
+}
+
+static int ssl_pk_server_compatible(modssl_pk_server_t *pks1, 
+                                    modssl_pk_server_t *pks2) 
+{
+    if (!pks1 || !pks2) {
+        return 0;
+    }
+    /* both have the same certificates? */
+    if ((pks1->ca_name_path != pks2->ca_name_path)
+        && (!pks1->ca_name_path || !pks2->ca_name_path 
+            || strcmp(pks1->ca_name_path, pks2->ca_name_path))) {
+        return 0;
+    }
+    if ((pks1->ca_name_file != pks2->ca_name_file)
+        && (!pks1->ca_name_file || !pks2->ca_name_file 
+            || strcmp(pks1->ca_name_file, pks2->ca_name_file))) {
+        return 0;
+    }
+    if (!ap_array_same_str_set(pks1->cert_files, pks2->cert_files)
+        || !ap_array_same_str_set(pks1->key_files, pks2->key_files)) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_auth_compatible(modssl_auth_ctx_t *a1, 
+                               modssl_auth_ctx_t *a2) 
+{
+    if (!a1 || !a2) {
+        return 0;
+    }
+    /* both have the same verification */
+    if ((a1->verify_depth != a2->verify_depth)
+        || (a1->verify_mode != a2->verify_mode)) {
+        return 0;
+    }
+    /* both have the same ca path/file */
+    if ((a1->ca_cert_path != a2->ca_cert_path)
+        && (!a1->ca_cert_path || !a2->ca_cert_path 
+            || strcmp(a1->ca_cert_path, a2->ca_cert_path))) {
+        return 0;
+    }
+    if ((a1->ca_cert_file != a2->ca_cert_file)
+        && (!a1->ca_cert_file || !a2->ca_cert_file 
+            || strcmp(a1->ca_cert_file, a2->ca_cert_file))) {
+        return 0;
+    }
+    /* both have the same ca cipher suite string */
+    if ((a1->cipher_suite != a2->cipher_suite)
+        && (!a1->cipher_suite || !a2->cipher_suite 
+            || strcmp(a1->cipher_suite, a2->cipher_suite))) {
+        return 0;
+    }
+    /* both have the same ca cipher suite string */
+    if ((a1->tls13_ciphers != a2->tls13_ciphers)
+        && (!a1->tls13_ciphers || !a2->tls13_ciphers 
+            || strcmp(a1->tls13_ciphers, a2->tls13_ciphers))) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_ctx_compatible(modssl_ctx_t *ctx1, 
+                              modssl_ctx_t *ctx2) 
+{
+    if (!ctx1 || !ctx2 
+        || (ctx1->protocol != ctx2->protocol)
+        || !ssl_auth_compatible(&ctx1->auth, &ctx2->auth)
+        || !ssl_pk_server_compatible(ctx1->pks, ctx2->pks)) {
+        return 0;
+    }
+    return 1;
+}
+
+static int ssl_server_compatible(server_rec *s1, server_rec *s2)
+{
+    SSLSrvConfigRec *sc1 = s1? mySrvConfig(s1) : NULL;
+    SSLSrvConfigRec *sc2 = s2? mySrvConfig(s2) : NULL;
+
+    /* both use the same TLS protocol? */
+    if (!sc1 || !sc2 
+        || !ssl_ctx_compatible(sc1->server, sc2->server)) {
+        return 0;
+    }
+    
+    return 1;
+}
+#endif
+
+/*
+ *  Post Read Request Handler
+ */
+int ssl_hook_ReadReq(request_rec *r)
+{
+    SSLSrvConfigRec *sc = mySrvConfig(r->server);
+    SSLConnRec *sslconn;
+    const char *upgrade;
+#ifdef HAVE_TLSEXT
+    const char *servername;
+#endif
+    SSL *ssl;
+
+    /* Perform TLS upgrade here if "SSLEngine optional" is configured,
+     * SSL is not already set up for this connection, and the client
+     * has sent a suitable Upgrade header. */
+    if (sc->enabled == SSL_ENABLED_OPTIONAL && !myConnConfig(r->connection)
+        && (upgrade = apr_table_get(r->headers_in, "Upgrade")) != NULL
+        && ap_find_token(r->pool, upgrade, "TLS/1.0")) {
+        if (upgrade_connection(r)) {
+            return AP_FILTER_ERROR;
+        }
+    }
+
+    /* If we are on a slave connection, we do not expect to have an SSLConnRec,
+     * but our master connection might. */
+    sslconn = myConnConfig(r->connection);
+    if (!(sslconn && sslconn->ssl) && r->connection->master) {
+        sslconn = myConnConfig(r->connection->master);
+    }
+    
+    /* If "SSLEngine optional" is configured, this is not an SSL
+     * connection, and this isn't a subrequest, send an Upgrade
+     * response header.  Note this must happen before map_to_storage
+     * and OPTIONS * request processing is completed.
+     */
+    if (sc->enabled == SSL_ENABLED_OPTIONAL && !(sslconn && sslconn->ssl)
+        && !r->main) {
+        apr_table_setn(r->headers_out, "Upgrade", "TLS/1.0, HTTP/1.1");
+        apr_table_mergen(r->headers_out, "Connection", "upgrade");
+    }
+
+    if (!sslconn) {
+        return DECLINED;
+    }
+
+    if (sslconn->service_unavailable) {
+        /* This is set when the SSL properties of this connection are
+         * incomplete or if this connection was made to challenge a 
+         * particular hostname (ACME). We never serve any request on 
+         * such a connection. */
+         /* TODO: a retry-after indicator would be nice here */
+        return HTTP_SERVICE_UNAVAILABLE;
+    }
+
+    if (sslconn->non_ssl_request == NON_SSL_SET_ERROR_MSG) {
+        apr_table_setn(r->notes, "error-notes",
+                       "Reason: You're speaking plain HTTP to an SSL-enabled "
+                       "server port.<br />\n Instead use the HTTPS scheme to "
+                       "access this URL, please.<br />\n");
+
+        /* Now that we have caught this error, forget it. we are done
+         * with using SSL on this request.
+         */
+        sslconn->non_ssl_request = NON_SSL_OK;
+
+        return HTTP_BAD_REQUEST;
+    }
+
+    /*
+     * Get the SSL connection structure and perform the
+     * delayed interlinking from SSL back to request_rec
+     */
+    ssl = sslconn->ssl;
+    if (!ssl) {
+        return DECLINED;
+    }
+#ifdef HAVE_TLSEXT
+    /*
+     * Perform SNI checks only on the initial request.  In particular,
+     * if these checks detect a problem, the checks shouldn't return an
+     * error again when processing an ErrorDocument redirect for the
+     * original problem.
+     */
+    if (r->proxyreq != PROXYREQ_PROXY && ap_is_initial_req(r)) {
+        server_rec *handshakeserver = sslconn->server;
+        SSLSrvConfigRec *hssc = mySrvConfig(handshakeserver);
+
+        if ((servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name))) {
+            /*
+             * The SNI extension supplied a hostname. So don't accept requests
+             * with either no hostname or a hostname that selected a different
+             * virtual host than the one used for the handshake, causing
+             * different SSL parameters to be applied, such as SSLProtocol,
+             * SSLCACertificateFile/Path and SSLCADNRequestFile/Path which
+             * cannot be renegotiated (SSLCA* due to current limitations in
+             * OpenSSL, see:
+             * http://mail-archives.apache.org/mod_mbox/httpd-dev/200806.mbox/%3C48592955.2090303@velox.ch%3E
+             * and
+             * http://mail-archives.apache.org/mod_mbox/httpd-dev/201312.mbox/%3CCAKQ1sVNpOrdiBm-UPw1hEdSN7YQXRRjeaT-MCWbW_7mN%3DuFiOw%40mail.gmail.com%3E
+             * )
+             */
+            if (!r->hostname) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02031)
+                            "Hostname %s provided via SNI, but no hostname"
+                            " provided in HTTP request", servername);
+                return HTTP_BAD_REQUEST;
+            }
+            if (r->server != handshakeserver 
+                && !ssl_server_compatible(sslconn->server, r->server)) {
+                /* 
+                 * The request does not select the virtual host that was
+                 * selected by the SNI and its SSL parameters are different
+                 */
+                
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02032)
+                             "Hostname %s provided via SNI and hostname %s provided"
+                             " via HTTP have no compatible SSL setup",
+                             servername, r->hostname);
+                return HTTP_MISDIRECTED_REQUEST;
+            }
+        }
+        else if (((sc->strict_sni_vhost_check == SSL_ENABLED_TRUE)
+                  || hssc->strict_sni_vhost_check == SSL_ENABLED_TRUE)
+                 && r->connection->vhost_lookup_data) {
+            /*
+             * We are using a name based configuration here, but no hostname was
+             * provided via SNI. Don't allow that if are requested to do strict
+             * checking. Check whether this strict checking was set up either in the
+             * server config we used for handshaking or in our current server.
+             * This should avoid insecure configuration by accident.
+             */
+            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02033)
+                         "No hostname was provided via SNI for a name based"
+                         " virtual host");
+            apr_table_setn(r->notes, "error-notes",
+                           "Reason: The client software did not provide a "
+                           "hostname using Server Name Indication (SNI), "
+                           "which is required to access this server.<br />\n");
+            return HTTP_FORBIDDEN;
+        }
+    }
+#endif
+    modssl_set_app_data2(ssl, r);
+
+    /*
+     * Log information about incoming HTTPS requests
+     */
+    if (APLOGrinfo(r) && ap_is_initial_req(r)) {
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02034)
+                     "%s HTTPS request received for child %ld (server %s)",
+                     (r->connection->keepalives <= 0 ?
+                     "Initial (No.1)" :
+                     apr_psprintf(r->pool, "Subsequent (No.%d)",
+                                  r->connection->keepalives+1)),
+                     r->connection->id,
+                     ssl_util_vhostid(r->pool, r->server));
+    }
+
+    /* SetEnvIf ssl-*-shutdown flags can only be per-server,
+     * so they won't change across keepalive requests
+     */
+    if (sslconn->shutdown_type == SSL_SHUTDOWN_TYPE_UNSET) {
+        ssl_configure_env(r, sslconn);
+    }
+
+    return DECLINED;
+}
+
+/*
+ * Move SetEnvIf information from request_rec to conn_rec/BUFF
+ * to allow the close connection handler to use them.
+ */
+
+static void ssl_configure_env(request_rec *r, SSLConnRec *sslconn)
+{
+    int i;
+    const apr_array_header_t *arr = apr_table_elts(r->subprocess_env);
+    const apr_table_entry_t *elts = (const apr_table_entry_t *)arr->elts;
+
+    sslconn->shutdown_type = SSL_SHUTDOWN_TYPE_STANDARD;
+
+    for (i = 0; i < arr->nelts; i++) {
+        const char *key = elts[i].key;
+
+        switch (*key) {
+          case 's':
+            /* being case-sensitive here.
+             * and not checking for the -shutdown since these are the only
+             * SetEnvIf "flags" we support
+             */
+            if (!strncmp(key+1, "sl-", 3)) {
+                key += 4;
+                if (!strncmp(key, "unclean", 7)) {
+                    sslconn->shutdown_type = SSL_SHUTDOWN_TYPE_UNCLEAN;
+                }
+                else if (!strncmp(key, "accurate", 8)) {
+                    sslconn->shutdown_type = SSL_SHUTDOWN_TYPE_ACCURATE;
+                }
+                return; /* should only ever be one ssl-*-shutdown */
+            }
+            break;
+        }
+    }
+}
+
+static int ssl_check_post_client_verify(request_rec *r, SSLSrvConfigRec *sc, 
+                                        SSLDirConfigRec *dc, SSLConnRec *sslconn,
+                                        SSL *ssl)
+{
+    X509 *cert;
+    
+    /*
+     * Remember the peer certificate's DN
+     */
+    if ((cert = SSL_get_peer_certificate(ssl))) {
+        if (sslconn->client_cert) {
+            X509_free(sslconn->client_cert);
+        }
+        sslconn->client_cert = cert;
+        sslconn->client_dn = NULL;
+    }
+    
+    /*
+     * Finally check for acceptable renegotiation results
+     */
+    if ((dc->nVerifyClient != SSL_CVERIFY_NONE) ||
+        (sc->server->auth.verify_mode != SSL_CVERIFY_NONE)) {
+        BOOL do_verify = ((dc->nVerifyClient == SSL_CVERIFY_REQUIRE) ||
+                          (sc->server->auth.verify_mode == SSL_CVERIFY_REQUIRE));
+
+        if (do_verify && (SSL_get_verify_result(ssl) != X509_V_OK)) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02262)
+                          "Re-negotiation handshake failed: "
+                          "Client verification failed");
+
+            return HTTP_FORBIDDEN;
+        }
+
+        if (do_verify) {
+            if (cert == NULL) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02263)
+                              "Re-negotiation handshake failed: "
+                              "Client certificate missing");
+
+                return HTTP_FORBIDDEN;
+            }
+        }
+    }
+    return OK;
+}
+
+/*
+ *  Access Handler, classic flavour, for SSL/TLS up to v1.2 
+ *  where everything can be renegotiated and no one is happy.
+ */
+static int ssl_hook_Access_classic(request_rec *r, SSLSrvConfigRec *sc, SSLDirConfigRec *dc,
+                                   SSLConnRec *sslconn, SSL *ssl)
+{
+    server_rec *handshakeserver = sslconn ? sslconn->server : NULL;
+    SSLSrvConfigRec *hssc       = handshakeserver? mySrvConfig(handshakeserver) : NULL;
+    SSL_CTX *ctx = ssl ? SSL_get_SSL_CTX(ssl) : NULL;
+    BOOL renegotiate = FALSE, renegotiate_quick = FALSE;
+    X509 *peercert;
+    X509_STORE *cert_store = NULL;
+    X509_STORE_CTX *cert_store_ctx;
+    STACK_OF(SSL_CIPHER) *cipher_list_old = NULL, *cipher_list = NULL;
+    const SSL_CIPHER *cipher = NULL;
+    int depth, verify_old, verify, n, rc;
+    const char *ncipher_suite;
+
+#ifdef HAVE_SRP
+    /*
+     * Support for per-directory reconfigured SSL connection parameters
+     *
+     * We do not force any renegotiation if the user is already authenticated
+     * via SRP.
+     *
+     */
+    if (SSL_get_srp_username(ssl)) {
+        return DECLINED;
+    }
+#endif
+
+    /*
+     * Support for per-directory reconfigured SSL connection parameters.
+     *
+     * This is implemented by forcing an SSL renegotiation with the
+     * reconfigured parameter suite. But Apache's internal API processing
+     * makes our life very hard here, because when internal sub-requests occur
+     * we nevertheless should avoid multiple unnecessary SSL handshakes (they
+     * require extra network I/O and especially time to perform).
+     *
+     * But the optimization for filtering out the unnecessary handshakes isn't
+     * obvious and trivial.  Especially because while Apache is in its
+     * sub-request processing the client could force additional handshakes,
+     * too. And these take place perhaps without our notice. So the only
+     * possibility is to explicitly _ask_ OpenSSL whether the renegotiation
+     * has to be performed or not. It has to performed when some parameters
+     * which were previously known (by us) are not those we've now
+     * reconfigured (as known by OpenSSL) or (in optimized way) at least when
+     * the reconfigured parameter suite is stronger (more restrictions) than
+     * the currently active one.
+     */
+
+    /*
+     * Override of SSLCipherSuite
+     *
+     * We provide two options here:
+     *
+     * o The paranoid and default approach where we force a renegotiation when
+     *   the cipher suite changed in _any_ way (which is straight-forward but
+     *   often forces renegotiations too often and is perhaps not what the
+     *   user actually wanted).
+     *
+     * o The optimized and still secure way where we force a renegotiation
+     *   only if the currently active cipher is no longer contained in the
+     *   reconfigured/new cipher suite. Any other changes are not important
+     *   because it's the servers choice to select a cipher from the ones the
+     *   client supports. So as long as the current cipher is still in the new
+     *   cipher suite we're happy. Because we can assume we would have
+     *   selected it again even when other (better) ciphers exists now in the
+     *   new cipher suite. This approach is fine because the user explicitly
+     *   has to enable this via ``SSLOptions +OptRenegotiate''. So we do no
+     *   implicit optimizations.
+     */     
+    ncipher_suite = (dc->szCipherSuite? 
+                     dc->szCipherSuite : (r->server != handshakeserver)?
+                     sc->server->auth.cipher_suite : NULL);
+    
+    if (ncipher_suite && (!sslconn->cipher_suite 
+                          || strcmp(ncipher_suite, sslconn->cipher_suite))) {
+        /* remember old state */
+
+        if (dc->nOptions & SSL_OPT_OPTRENEGOTIATE) {
+            cipher = SSL_get_current_cipher(ssl);
+        }
+        else {
+            cipher_list_old = (STACK_OF(SSL_CIPHER) *)SSL_get_ciphers(ssl);
+
+            if (cipher_list_old) {
+                cipher_list_old = sk_SSL_CIPHER_dup(cipher_list_old);
+            }
+        }
+
+        /* configure new state */
+        if (r->connection->master) {
+            /* TODO: this categorically fails changed cipher suite settings
+             * on slave connections. We could do better by
+             * - create a new SSL* from our SSL_CTX and set cipher suite there,
+             *   and retrieve ciphers, free afterwards
+             * Modifying the SSL on a slave connection is no good.
+             */
+            apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "cipher-suite");
+            return HTTP_FORBIDDEN;
+        }
+
+        if (!SSL_set_cipher_list(ssl, ncipher_suite)) {
+            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02253)
+                          "Unable to reconfigure (per-directory) "
+                          "permitted SSL ciphers");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+
+            if (cipher_list_old) {
+                sk_SSL_CIPHER_free(cipher_list_old);
+            }
+
+            return HTTP_FORBIDDEN;
+        }
+
+        /* determine whether a renegotiation has to be forced */
+        cipher_list = (STACK_OF(SSL_CIPHER) *)SSL_get_ciphers(ssl);
+
+        if (dc->nOptions & SSL_OPT_OPTRENEGOTIATE) {
+            /* optimized way */
+            if ((!cipher && cipher_list) ||
+                (cipher && !cipher_list))
+            {
+                renegotiate = TRUE;
+            }
+            else if (cipher && cipher_list &&
+                     (sk_SSL_CIPHER_find(cipher_list, cipher) < 0))
+            {
+                renegotiate = TRUE;
+            }
+        }
+        else {
+            /* paranoid way */
+            if ((!cipher_list_old && cipher_list) ||
+                (cipher_list_old && !cipher_list))
+            {
+                renegotiate = TRUE;
+            }
+            else if (cipher_list_old && cipher_list) {
+                for (n = 0;
+                     !renegotiate && (n < sk_SSL_CIPHER_num(cipher_list));
+                     n++)
+                {
+                    const SSL_CIPHER *value = sk_SSL_CIPHER_value(cipher_list, n);
+
+                    if (sk_SSL_CIPHER_find(cipher_list_old, value) < 0) {
+                        renegotiate = TRUE;
+                    }
+                }
+
+                for (n = 0;
+                     !renegotiate && (n < sk_SSL_CIPHER_num(cipher_list_old));
+                     n++)
+                {
+                    const SSL_CIPHER *value = sk_SSL_CIPHER_value(cipher_list_old, n);
+
+                    if (sk_SSL_CIPHER_find(cipher_list, value) < 0) {
+                        renegotiate = TRUE;
+                    }
+                }
+            }
+        }
+
+        /* cleanup */
+        if (cipher_list_old) {
+            sk_SSL_CIPHER_free(cipher_list_old);
+        }
+
+        if (renegotiate) {
+            if (r->connection->master) {
+                /* The request causes renegotiation on a slave connection.
+                 * This is not allowed since we might have concurrent requests
+                 * on this connection.
+                 */
+                apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "cipher-suite");
+                return HTTP_FORBIDDEN;
+            }
+            
+#ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
+            if (sc->cipher_server_pref == TRUE) {
+                SSL_set_options(ssl, SSL_OP_CIPHER_SERVER_PREFERENCE);
+            }
+#endif
+            /* tracing */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02220)
+                         "Reconfigured cipher suite will force renegotiation");
+        }
+    }
+
+    /*
+     * override of SSLVerifyClient
+     *
+     * We force a renegotiation if the reconfigured/new verify type is
+     * stronger than the currently active verify type.
+     *
+     * The order is: none << optional_no_ca << optional << require
+     *
+     * Additionally the following optimization is possible here: When the
+     * currently active verify type is "none" but a client certificate is
+     * already known/present, it's enough to manually force a client
+     * verification but at least skip the I/O-intensive renegotiation
+     * handshake.
+     */
+    if ((dc->nVerifyClient != SSL_CVERIFY_UNSET) ||
+        (sc->server->auth.verify_mode != SSL_CVERIFY_UNSET)) {
+
+        /* remember old state */
+        verify_old = SSL_get_verify_mode(ssl);
+        /* configure new state */
+        verify = SSL_VERIFY_NONE;
+
+        if ((dc->nVerifyClient == SSL_CVERIFY_REQUIRE) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_REQUIRE)) {
+            verify |= SSL_VERIFY_PEER_STRICT;
+        }
+
+        if ((dc->nVerifyClient == SSL_CVERIFY_OPTIONAL) ||
+            (dc->nVerifyClient == SSL_CVERIFY_OPTIONAL_NO_CA) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_OPTIONAL) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_OPTIONAL_NO_CA))
+        {
+            verify |= SSL_VERIFY_PEER;
+        }
+
+        /* TODO: this seems premature since we do not know if there
+         *       are any changes required.
+         */
+        SSL_set_verify(ssl, verify, ssl_callback_SSLVerify);
+        SSL_set_verify_result(ssl, X509_V_OK);
+
+        /* determine whether we've to force a renegotiation */
+        if (!renegotiate && verify != verify_old) {
+            if (((verify_old == SSL_VERIFY_NONE) &&
+                 (verify     != SSL_VERIFY_NONE)) ||
+
+                (!(verify_old & SSL_VERIFY_PEER) &&
+                  (verify     & SSL_VERIFY_PEER)) ||
+
+                (!(verify_old & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) &&
+                  (verify     & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)))
+            {
+                renegotiate = TRUE;
+                if (r->connection->master) {
+                    /* The request causes renegotiation on a slave connection.
+                     * This is not allowed since we might have concurrent requests
+                     * on this connection.
+                     */
+                    apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "verify-client");
+                    SSL_set_verify(ssl, verify_old, ssl_callback_SSLVerify);
+                    return HTTP_FORBIDDEN;
+                }
+                /* optimization */
+
+                if ((dc->nOptions & SSL_OPT_OPTRENEGOTIATE) &&
+                    (verify_old == SSL_VERIFY_NONE) &&
+                    ((peercert = SSL_get_peer_certificate(ssl)) != NULL))
+                {
+                    renegotiate_quick = TRUE;
+                    X509_free(peercert);
+                }
+
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02255)
+                              "Changed client verification type will force "
+                              "%srenegotiation",
+                              renegotiate_quick ? "quick " : "");
+            }
+            else if (verify != SSL_VERIFY_NONE) {
+                /*
+                 * override of SSLVerifyDepth
+                 *
+                 * The depth checks are handled by us manually inside the
+                 * verify callback function and not by OpenSSL internally
+                 * (and our function is aware of both the per-server and
+                 * per-directory contexts). So we cannot ask OpenSSL about
+                 * the currently verify depth. Instead we remember it in our
+                 * SSLConnRec attached to the SSL* of OpenSSL.  We've to force
+                 * the renegotiation if the reconfigured/new verify depth is
+                 * less than the currently active/remembered verify depth
+                 * (because this means more restriction on the certificate
+                 * chain).
+                 */
+                n = (sslconn->verify_depth != UNSET)
+                    ? sslconn->verify_depth
+                    : hssc->server->auth.verify_depth;
+                /* determine the new depth */
+                sslconn->verify_depth = (dc->nVerifyDepth != UNSET)
+                                        ? dc->nVerifyDepth
+                                        : sc->server->auth.verify_depth;
+                if (sslconn->verify_depth < n) {
+                    renegotiate = TRUE;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02254)
+                                  "Reduced client verification depth will "
+                                  "force renegotiation");
+                }
+            }
+        }
+        /* If we're handling a request for a vhost other than the default one,
+         * then we need to make sure that client authentication is properly
+         * enforced. For clients supplying an SNI extension, the peer
+         * certificate verification has happened in the handshake already
+         * (and r->server == handshakeserver). For non-SNI requests,
+         * an additional check is needed here. If client authentication
+         * is configured as mandatory, then we can only proceed if the
+         * CA list doesn't have to be changed (OpenSSL doesn't provide
+         * an option to change the list for an existing session).
+         */
+        if ((r->server != handshakeserver)
+            && renegotiate
+            && ((verify & SSL_VERIFY_PEER) ||
+                (verify & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
+#define MODSSL_CFG_CA_NE(f, sc1, sc2) \
+            (sc1->server->auth.f && \
+             (!sc2->server->auth.f || \
+              strNE(sc1->server->auth.f, sc2->server->auth.f)))
+
+            if (MODSSL_CFG_CA_NE(ca_cert_file, sc, hssc) ||
+                MODSSL_CFG_CA_NE(ca_cert_path, sc, hssc)) {
+                if (verify & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
+                    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02256)
+                         "Non-default virtual host with SSLVerify set to "
+                         "'require' and VirtualHost-specific CA certificate "
+                         "list is only available to clients with TLS server "
+                         "name indication (SNI) support");
+                    SSL_set_verify(ssl, verify_old, NULL);
+                    return HTTP_FORBIDDEN;
+                } else
+                    /* let it pass, possibly with an "incorrect" peer cert,
+                     * so make sure the SSL_CLIENT_VERIFY environment variable
+                     * will indicate partial success only, later on.
+                     */
+                    sslconn->verify_info = "GENEROUS";
+            }
+        }
+    }
+
+    /* Fill reneg buffer if required. */
+    if (renegotiate && !renegotiate_quick) {
+        rc = fill_reneg_buffer(r, dc);
+        if (rc) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02257)
+                          "could not buffer message body to allow "
+                          "SSL renegotiation to proceed");
+            return rc;
+        }
+    }
+
+    /*
+     * now do the renegotiation if anything was actually reconfigured
+     */
+    if (renegotiate) {
+        /*
+         * Now we force the SSL renegotiation by sending the Hello Request
+         * message to the client. Here we have to do a workaround: Actually
+         * OpenSSL returns immediately after sending the Hello Request (the
+         * intent AFAIK is because the SSL/TLS protocol says it's not a must
+         * that the client replies to a Hello Request). But because we insist
+         * on a reply (anything else is an error for us) we have to go to the
+         * ACCEPT state manually. Using SSL_set_accept_state() doesn't work
+         * here because it resets too much of the connection.  So we set the
+         * state explicitly and continue the handshake manually.
+         */
+        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02221)
+                      "Requesting connection re-negotiation");
+
+        if (renegotiate_quick) {
+            STACK_OF(X509) *cert_stack;
+            X509 *cert;
+
+            /* perform just a manual re-verification of the peer */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02258)
+                         "Performing quick renegotiation: "
+                         "just re-verifying the peer");
+
+            cert_stack = (STACK_OF(X509) *)SSL_get_peer_cert_chain(ssl);
+
+            cert = SSL_get_peer_certificate(ssl);
+
+            if (!cert_stack || (sk_X509_num(cert_stack) == 0)) {
+                if (!cert) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02222)
+                                  "Cannot find peer certificate chain");
+
+                    return HTTP_FORBIDDEN;
+                }
+
+                /* client cert is in the session cache, but there is
+                 * no chain, since ssl3_get_client_certificate()
+                 * sk_X509_shift-ed the peer cert out of the chain.
+                 * we put it back here for the purpose of quick_renegotiation.
+                 */
+                cert_stack = sk_X509_new_null();
+                sk_X509_push(cert_stack, cert);
+            }
+
+            if (!(cert_store ||
+                  (cert_store = SSL_CTX_get_cert_store(ctx))))
+            {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02223)
+                              "Cannot find certificate storage");
+
+                return HTTP_FORBIDDEN;
+            }
+
+            if (!cert) {
+                cert = sk_X509_value(cert_stack, 0);
+            }
+
+            cert_store_ctx = X509_STORE_CTX_new();
+            X509_STORE_CTX_init(cert_store_ctx, cert_store, cert, cert_stack);
+            depth = SSL_get_verify_depth(ssl);
+
+            if (depth >= 0) {
+                X509_STORE_CTX_set_depth(cert_store_ctx, depth);
+            }
+
+            X509_STORE_CTX_set_ex_data(cert_store_ctx,
+                                       SSL_get_ex_data_X509_STORE_CTX_idx(),
+                                       (char *)ssl);
+
+            if (!X509_verify_cert(cert_store_ctx)) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02224)
+                              "Re-negotiation verification step failed");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+            }
+
+            SSL_set_verify_result(ssl, X509_STORE_CTX_get_error(cert_store_ctx));
+            X509_STORE_CTX_cleanup(cert_store_ctx);
+            X509_STORE_CTX_free(cert_store_ctx);
+
+            if (cert_stack != SSL_get_peer_cert_chain(ssl)) {
+                /* we created this ourselves, so free it */
+                sk_X509_pop_free(cert_stack, X509_free);
+            }
+        }
+        else {
+            char peekbuf[1];
+            const char *reneg_support;
+            request_rec *id = r->main ? r->main : r;
+
+            /* Additional mitigation for CVE-2009-3555: At this point,
+             * before renegotiating, an (entire) request has been read
+             * from the connection.  An attacker may have sent further
+             * data to "prefix" any subsequent request by the victim's
+             * client after the renegotiation; this data may already
+             * have been read and buffered.  Forcing a connection
+             * closure after the response ensures such data will be
+             * discarded.  Legimately pipelined HTTP requests will be
+             * retried anyway with this approach. */
+            if (has_buffered_data(r)) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02259)
+                              "insecure SSL re-negotiation required, but "
+                              "a pipelined request is present; keepalive "
+                              "disabled");
+                r->connection->keepalive = AP_CONN_CLOSE;
+            }
+
+#if defined(SSL_get_secure_renegotiation_support)
+            reneg_support = SSL_get_secure_renegotiation_support(ssl) ?
+                            "client does" : "client does not";
+#else
+            reneg_support = "server does not";
+#endif
+            /* Perform a full renegotiation. */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02260)
+                          "Performing full renegotiation: complete handshake "
+                          "protocol (%s support secure renegotiation)",
+                          reneg_support);
+
+            SSL_set_session_id_context(ssl,
+                                       (unsigned char *)&id,
+                                       sizeof(id));
+
+            /* Toggle the renegotiation state to allow the new
+             * handshake to proceed. */
+            sslconn->reneg_state = RENEG_ALLOW;
+
+            SSL_renegotiate(ssl);
+            SSL_do_handshake(ssl);
+
+            if (!SSL_is_init_finished(ssl)) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02225)
+                              "Re-negotiation request failed");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+
+                r->connection->keepalive = AP_CONN_CLOSE;
+                return HTTP_FORBIDDEN;
+            }
+
+            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02226)
+                          "Awaiting re-negotiation handshake");
+
+            /* XXX: Should replace setting state with SSL_renegotiate(ssl);
+             * However, this causes failures in perl-framework currently,
+             * perhaps pre-test if we have already negotiated?
+             */
+            /* Need to trigger renegotiation handshake by reading.
+             * Peeking 0 bytes actually works.
+             * See: http://marc.info/?t=145493359200002&r=1&w=2
+             */
+            SSL_peek(ssl, peekbuf, 0);
+
+            sslconn->reneg_state = RENEG_REJECT;
+
+            if (!SSL_is_init_finished(ssl)) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02261)
+                              "Re-negotiation handshake failed");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+
+                r->connection->keepalive = AP_CONN_CLOSE;
+                return HTTP_FORBIDDEN;
+            }
+
+            /* Full renegotiation successful, we now have handshaken with
+             * this server's parameters.
+             */
+            sslconn->server = r->server;
+        }
+
+        /*
+         * Finally check for acceptable renegotiation results
+         */
+        if (OK != (rc = ssl_check_post_client_verify(r, sc, dc, sslconn, ssl))) {
+            return rc;
+        }
+
+        /*
+         * Also check that SSLCipherSuite has been enforced as expected.
+         */
+        if (cipher_list) {
+            cipher = SSL_get_current_cipher(ssl);
+            if (sk_SSL_CIPHER_find(cipher_list, cipher) < 0) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02264)
+                             "SSL cipher suite not renegotiated: "
+                             "access to %s denied using cipher %s",
+                              r->filename,
+                              SSL_CIPHER_get_name(cipher));
+                return HTTP_FORBIDDEN;
+            }
+        }
+        /* remember any new cipher suite used in renegotiation */
+        if (ncipher_suite) {
+            sslconn->cipher_suite = ncipher_suite;
+        }
+    }
+
+    return DECLINED;
+}
+
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+/*
+ *  Access Handler, modern flavour, for SSL/TLS v1.3 and onward. 
+ *  Only client certificates can be requested, everything else stays.
+ */
+static int ssl_hook_Access_modern(request_rec *r, SSLSrvConfigRec *sc, SSLDirConfigRec *dc,
+                                  SSLConnRec *sslconn, SSL *ssl)
+{
+    if ((dc->nVerifyClient != SSL_CVERIFY_UNSET) ||
+        (sc->server->auth.verify_mode != SSL_CVERIFY_UNSET)) {
+        int vmode_inplace, vmode_needed;
+        int change_vmode = FALSE;
+        int old_state, n, rc;
+
+        vmode_inplace = SSL_get_verify_mode(ssl);
+        vmode_needed = SSL_VERIFY_NONE;
+
+        if ((dc->nVerifyClient == SSL_CVERIFY_REQUIRE) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_REQUIRE)) {
+            vmode_needed |= SSL_VERIFY_PEER_STRICT;
+        }
+
+        if ((dc->nVerifyClient == SSL_CVERIFY_OPTIONAL) ||
+            (dc->nVerifyClient == SSL_CVERIFY_OPTIONAL_NO_CA) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_OPTIONAL) ||
+            (sc->server->auth.verify_mode == SSL_CVERIFY_OPTIONAL_NO_CA))
+        {
+            vmode_needed |= SSL_VERIFY_PEER;
+        }
+
+        if (vmode_needed == SSL_VERIFY_NONE) {
+            return DECLINED;
+        }
+
+        vmode_needed |= SSL_VERIFY_CLIENT_ONCE;
+        if (vmode_inplace != vmode_needed) {
+            /* Need to change, if new setting is more restrictive than existing one */
+
+            if ((vmode_inplace == SSL_VERIFY_NONE)
+                || (!(vmode_inplace   & SSL_VERIFY_PEER) 
+                    && (vmode_needed  & SSL_VERIFY_PEER))
+                || (!(vmode_inplace   & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) 
+                    && (vmode_needed & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) {
+                /* need to change the effective verify mode */
+                change_vmode = TRUE;
+            }
+            else {
+                /* FIXME: does this work with TLSv1.3? Is this more than re-inspecting
+                 * the certificate we should already have? */
+                /*
+                 * override of SSLVerifyDepth
+                 *
+                 * The depth checks are handled by us manually inside the
+                 * verify callback function and not by OpenSSL internally
+                 * (and our function is aware of both the per-server and
+                 * per-directory contexts). So we cannot ask OpenSSL about
+                 * the currently verify depth. Instead we remember it in our
+                 * SSLConnRec attached to the SSL* of OpenSSL.  We've to force
+                 * the renegotiation if the reconfigured/new verify depth is
+                 * less than the currently active/remembered verify depth
+                 * (because this means more restriction on the certificate
+                 * chain).
+                 */
+                n = (sslconn->verify_depth != UNSET)? 
+                    sslconn->verify_depth : sc->server->auth.verify_depth;
+                /* determine the new depth */
+                sslconn->verify_depth = (dc->nVerifyDepth != UNSET)
+                                        ? dc->nVerifyDepth
+                                        : sc->server->auth.verify_depth;
+                if (sslconn->verify_depth < n) {
+                    change_vmode = TRUE;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(10128)
+                                  "Reduced client verification depth will "
+                                  "force renegotiation");
+                }
+            }
+        }
+
+        /* Fill reneg buffer if required. */
+        if (change_vmode) {
+            char peekbuf[1];
+
+            if (r->connection->master) {
+                /* FIXME: modifying the SSL on a slave connection is no good.
+                 * We would need to push this back to the master connection
+                 * somehow.
+                 */
+                apr_table_setn(r->notes, "ssl-renegotiate-forbidden", "verify-client");
+                return HTTP_FORBIDDEN;
+            }
+
+            rc = fill_reneg_buffer(r, dc);
+            if (rc) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10228)
+                              "could not buffer message body to allow "
+                              "TLS Post-Handshake Authentication to proceed");
+                return rc;
+            }
+            
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(10129)
+                          "verify client post handshake");
+
+            SSL_set_verify(ssl, vmode_needed, ssl_callback_SSLVerify);
+
+            if (SSL_verify_client_post_handshake(ssl) != 1) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10158)
+                              "cannot perform post-handshake authentication");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, r->server);
+                apr_table_setn(r->notes, "error-notes",
+                               "Reason: Cannot perform Post-Handshake Authentication.<br />");
+                SSL_set_verify(ssl, vmode_inplace, NULL);
+                return HTTP_FORBIDDEN;
+            }
+            
+            old_state = sslconn->reneg_state;
+            sslconn->reneg_state = RENEG_ALLOW;
+            modssl_set_app_data2(ssl, r);
+
+            SSL_do_handshake(ssl);
+            /* Need to trigger renegotiation handshake by reading.
+             * Peeking 0 bytes actually works.
+             * See: http://marc.info/?t=145493359200002&r=1&w=2
+             */
+            SSL_peek(ssl, peekbuf, 0);
+
+            sslconn->reneg_state = old_state;
+            modssl_set_app_data2(ssl, NULL);
+
+            /*
+             * Finally check for acceptable renegotiation results
+             */
+            if (OK != (rc = ssl_check_post_client_verify(r, sc, dc, sslconn, ssl))) {
+                SSL_set_verify(ssl, vmode_inplace, NULL);
+                return rc;
+            }
+        }
+    }
+
+    return DECLINED;
+}
+#endif
+
+int ssl_hook_Access(request_rec *r)
+{
+    SSLDirConfigRec *dc         = myDirConfig(r);
+    SSLSrvConfigRec *sc         = mySrvConfig(r->server);
+    SSLConnRec *sslconn         = myConnConfig(r->connection);
+    SSL *ssl                    = sslconn ? sslconn->ssl : NULL;
+    apr_array_header_t *requires;
+    ssl_require_t *ssl_requires;
+    int ok, i, ret;
+
+    /* On a slave connection, we do not expect to have an SSLConnRec, but
+     * our master connection might have one. */
+    if (!(sslconn && ssl) && r->connection->master) {
+        sslconn         = myConnConfig(r->connection->master);
+        ssl             = sslconn ? sslconn->ssl : NULL;
+    }
+
+    /*
+     * We should have handshaken here, otherwise we are being 
+     * redirected (ErrorDocument) from a renegotiation failure below. 
+     * The access is still forbidden in the latter case, let ap_die() handle
+     * this recursive (same) error.
+     */
+    if (ssl && !SSL_is_init_finished(ssl)) {
+        return HTTP_FORBIDDEN;
+    }
+
+    /*
+     * Support for SSLRequireSSL directive
+     */
+    if (dc->bSSLRequired && !ssl) {
+        if ((sc->enabled == SSL_ENABLED_OPTIONAL) && !r->connection->master) {
+            /* This vhost was configured for optional SSL, just tell the
+             * client that we need to upgrade.
+             */
+            apr_table_setn(r->err_headers_out, "Upgrade", "TLS/1.0, HTTP/1.1");
+            apr_table_setn(r->err_headers_out, "Connection", "Upgrade");
+
+            return HTTP_UPGRADE_REQUIRED;
+        }
+
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02219)
+                      "access to %s failed, reason: %s",
+                      r->filename, "SSL connection required");
+
+        /* remember forbidden access for strict require option */
+        apr_table_setn(r->notes, "ssl-access-forbidden", "1");
+
+        return HTTP_FORBIDDEN;
+    }
+
+    /*
+     * Check to see whether SSL is in use; if it's not, then no
+     * further access control checks are relevant.  (the test for
+     * sc->enabled is probably strictly unnecessary)
+     */
+    if (sc->enabled == SSL_ENABLED_FALSE || !ssl) {
+        return DECLINED;
+    }
+
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    /* TLSv1.3+ is less complicated here. Branch off into a new codeline
+     * and avoid messing with the past. */
+    if (SSL_version(ssl) >= TLS1_3_VERSION) {
+        ret = ssl_hook_Access_modern(r, sc, dc, sslconn, ssl);
+    }
+    else
+#endif
+    {
+        ret = ssl_hook_Access_classic(r, sc, dc, sslconn, ssl);
+    }
+
+    if (ret != DECLINED) {
+        return ret;
+    }
+
+    /* If we're trying to have the user name set from a client
+     * certificate then we need to set it here. This should be safe as
+     * the user name probably isn't important from an auth checking point
+     * of view as the certificate supplied acts in that capacity.
+     * However, if FakeAuth is being used then this isn't the case so
+     * we need to postpone setting the username until later.
+     */
+    if ((dc->nOptions & SSL_OPT_FAKEBASICAUTH) == 0 && dc->szUserName) {
+        char *val = ssl_var_lookup(r->pool, r->server, r->connection,
+                                   r, (char *)dc->szUserName);
+        if (val && val[0])
+            r->user = val;
+        else
+            ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02227)
+                          "Failed to set r->user to '%s'", dc->szUserName);
+    }
+
+    /*
+     * Check SSLRequire boolean expressions
+     */
+    requires = dc->aRequirement;
+    ssl_requires = (ssl_require_t *)requires->elts;
+
+    for (i = 0; i < requires->nelts; i++) {
+        ssl_require_t *req = &ssl_requires[i];
+        const char *errstring;
+        ok = ap_expr_exec(r, req->mpExpr, &errstring);
+
+        if (ok < 0) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02265)
+                          "access to %s failed, reason: Failed to execute "
+                          "SSL requirement expression: %s",
+                          r->filename, errstring);
+
+            /* remember forbidden access for strict require option */
+            apr_table_setn(r->notes, "ssl-access-forbidden", "1");
+
+            return HTTP_FORBIDDEN;
+        }
+
+        if (ok != 1) {
+            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02266)
+                          "Access to %s denied for %s "
+                          "(requirement expression not fulfilled)",
+                          r->filename, r->useragent_ip);
+
+            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02228)
+                          "Failed expression: %s", req->cpExpr);
+
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02229)
+                          "access to %s failed, reason: %s",
+                          r->filename,
+                          "SSL requirement expression not fulfilled");
+
+            /* remember forbidden access for strict require option */
+            apr_table_setn(r->notes, "ssl-access-forbidden", "1");
+
+            return HTTP_FORBIDDEN;
+        }
+    }
+
+    /*
+     * Else access is granted from our point of view (except vendor
+     * handlers override). But we have to return DECLINED here instead
+     * of OK, because mod_auth and other modules still might want to
+     * deny access.
+     */
+
+    return DECLINED;
+}
+
+/*
+ *  Authentication Handler:
+ *  Fake a Basic authentication from the X509 client certificate.
+ *
+ *  This must be run fairly early on to prevent a real authentication from
+ *  occurring, in particular it must be run before anything else that
+ *  authenticates a user.  This means that the Module statement for this
+ *  module should be LAST in the Configuration file.
+ */
+int ssl_hook_UserCheck(request_rec *r)
+{
+    SSLConnRec *sslconn;
+    SSLDirConfigRec *dc = myDirConfig(r);
+    char *clientdn;
+    const char *auth_line, *username, *password;
+
+    /*
+     * Additionally forbid access (again)
+     * when strict require option is used.
+     */
+    if ((dc->nOptions & SSL_OPT_STRICTREQUIRE) &&
+        (apr_table_get(r->notes, "ssl-access-forbidden")))
+    {
+        return HTTP_FORBIDDEN;
+    }
+
+    /*
+     * We decline when we are in a subrequest.  The Authorization header
+     * would already be present if it was added in the main request.
+     */
+    if (!ap_is_initial_req(r)) {
+        return DECLINED;
+    }
+
+    /*
+     * Make sure the user is not able to fake the client certificate
+     * based authentication by just entering an X.509 Subject DN
+     * ("/XX=YYY/XX=YYY/..") as the username and "password" as the
+     * password.
+     */
+    if ((auth_line = apr_table_get(r->headers_in, "Authorization"))) {
+        if (strcEQ(ap_getword(r->pool, &auth_line, ' '), "Basic")) {
+            while ((*auth_line == ' ') || (*auth_line == '\t')) {
+                auth_line++;
+            }
+
+            auth_line = ap_pbase64decode(r->pool, auth_line);
+            username = ap_getword_nulls(r->pool, &auth_line, ':');
+            password = auth_line;
+
+            if ((username[0] == '/') && strEQ(password, "password")) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02035)
+                    "Encountered FakeBasicAuth spoof: %s", username);
+                return HTTP_FORBIDDEN;
+            }
+        }
+    }
+
+    /*
+     * We decline operation in various situations...
+     * - TLS not enabled
+     * - client did not present a certificate
+     * - SSLOptions +FakeBasicAuth not configured
+     * - r->user already authenticated
+     */
+    if (!modssl_request_is_tls(r, &sslconn)
+        || !sslconn->client_cert
+        || !(dc->nOptions & SSL_OPT_FAKEBASICAUTH)
+        || r->user) {
+        return DECLINED;
+    }
+
+    if (!sslconn->client_dn) {
+        X509_NAME *name = X509_get_subject_name(sslconn->client_cert);
+        char *cp = X509_NAME_oneline(name, NULL, 0);
+        sslconn->client_dn = apr_pstrdup(r->connection->pool, cp);
+        OPENSSL_free(cp);
+    }
+
+    clientdn = (char *)sslconn->client_dn;
+
+    /*
+     * Fake a password - which one would be immaterial, as, it seems, an empty
+     * password in the users file would match ALL incoming passwords, if only
+     * we were using the standard crypt library routine. Unfortunately, OpenSSL
+     * "fixes" a "bug" in crypt and thus prevents blank passwords from
+     * working.  (IMHO what they really fix is a bug in the users of the code
+     * - failing to program correctly for shadow passwords).  We need,
+     * therefore, to provide a password. This password can be matched by
+     * adding the string "xxj31ZMTZzkVA" as the password in the user file.
+     * This is just the crypted variant of the word "password" ;-)
+     */
+    auth_line = apr_pstrcat(r->pool, "Basic ",
+                            ap_pbase64encode(r->pool,
+                                             apr_pstrcat(r->pool, clientdn,
+                                                         ":password", NULL)),
+                            NULL);
+    apr_table_setn(r->headers_in, "Authorization", auth_line);
+
+    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02036)
+                  "Faking HTTP Basic Auth header: \"Authorization: %s\"",
+                  auth_line);
+
+    return DECLINED;
+}
+
+/* authorization phase */
+int ssl_hook_Auth(request_rec *r)
+{
+    SSLDirConfigRec *dc = myDirConfig(r);
+
+    /*
+     * Additionally forbid access (again)
+     * when strict require option is used.
+     */
+    if ((dc->nOptions & SSL_OPT_STRICTREQUIRE) &&
+        (apr_table_get(r->notes, "ssl-access-forbidden")))
+    {
+        return HTTP_FORBIDDEN;
+    }
+
+    return DECLINED;
+}
+
+/*
+ *   Fixup Handler
+ */
+
+static const char *const ssl_hook_Fixup_vars[] = {
+    "SSL_VERSION_INTERFACE",
+    "SSL_VERSION_LIBRARY",
+    "SSL_PROTOCOL",
+    "SSL_SECURE_RENEG",
+    "SSL_COMPRESS_METHOD",
+    "SSL_CIPHER",
+    "SSL_CIPHER_EXPORT",
+    "SSL_CIPHER_USEKEYSIZE",
+    "SSL_CIPHER_ALGKEYSIZE",
+    "SSL_CLIENT_VERIFY",
+    "SSL_CLIENT_M_VERSION",
+    "SSL_CLIENT_M_SERIAL",
+    "SSL_CLIENT_V_START",
+    "SSL_CLIENT_V_END",
+    "SSL_CLIENT_V_REMAIN",
+    "SSL_CLIENT_S_DN",
+    "SSL_CLIENT_I_DN",
+    "SSL_CLIENT_A_KEY",
+    "SSL_CLIENT_A_SIG",
+    "SSL_CLIENT_CERT_RFC4523_CEA",
+    "SSL_SERVER_M_VERSION",
+    "SSL_SERVER_M_SERIAL",
+    "SSL_SERVER_V_START",
+    "SSL_SERVER_V_END",
+    "SSL_SERVER_S_DN",
+    "SSL_SERVER_I_DN",
+    "SSL_SERVER_A_KEY",
+    "SSL_SERVER_A_SIG",
+    "SSL_SESSION_ID",
+    "SSL_SESSION_RESUMED",
+#ifdef HAVE_SRP
+    "SSL_SRP_USER",
+    "SSL_SRP_USERINFO",
+#endif
+    NULL
+};
+
+int ssl_hook_Fixup(request_rec *r)
+{
+    SSLDirConfigRec *dc = myDirConfig(r);
+    apr_table_t *env = r->subprocess_env;
+    char *var, *val = "";
+#ifdef HAVE_TLSEXT
+    const char *servername;
+#endif
+    STACK_OF(X509) *peer_certs;
+    SSLConnRec *sslconn;
+    SSL *ssl;
+    int i;
+
+    if (!modssl_request_is_tls(r, &sslconn)) {
+        return DECLINED;
+    }
+    ssl = sslconn->ssl;
+
+    /*
+     * Annotate the SSI/CGI environment with standard SSL information
+     */
+    /* the always present HTTPS (=HTTP over SSL) flag! */
+    apr_table_setn(env, "HTTPS", "on");
+
+#ifdef HAVE_TLSEXT
+    /* add content of SNI TLS extension (if supplied with ClientHello) */
+    if ((servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name))) {
+        apr_table_set(env, "SSL_TLS_SNI", servername);
+    }
+#endif
+
+    /* standard SSL environment variables */
+    if (dc->nOptions & SSL_OPT_STDENVVARS) {
+        modssl_var_extract_dns(env, ssl, r->pool);
+        modssl_var_extract_san_entries(env, ssl, r->pool);
+
+        for (i = 0; ssl_hook_Fixup_vars[i]; i++) {
+            var = (char *)ssl_hook_Fixup_vars[i];
+            val = ssl_var_lookup(r->pool, r->server, r->connection, r, var);
+            if (!strIsEmpty(val)) {
+                apr_table_setn(env, var, val);
+            }
+        }
+    }
+
+    /*
+     * On-demand bloat up the SSI/CGI environment with certificate data
+     */
+    if (dc->nOptions & SSL_OPT_EXPORTCERTDATA) {
+        val = ssl_var_lookup(r->pool, r->server, r->connection,
+                             r, "SSL_SERVER_CERT");
+
+        apr_table_setn(env, "SSL_SERVER_CERT", val);
+
+        val = ssl_var_lookup(r->pool, r->server, r->connection,
+                             r, "SSL_CLIENT_CERT");
+
+        apr_table_setn(env, "SSL_CLIENT_CERT", val);
+
+        if ((peer_certs = (STACK_OF(X509) *)SSL_get_peer_cert_chain(ssl))) {
+            for (i = 0; i < sk_X509_num(peer_certs); i++) {
+                var = apr_psprintf(r->pool, "SSL_CLIENT_CERT_CHAIN_%d", i);
+                val = ssl_var_lookup(r->pool, r->server, r->connection,
+                                     r, var);
+                if (val) {
+                    apr_table_setn(env, var, val);
+                }
+            }
+        }
+    }
+
+
+#ifdef SSL_get_secure_renegotiation_support
+    apr_table_setn(r->notes, "ssl-secure-reneg",
+                   SSL_get_secure_renegotiation_support(ssl) ? "1" : "0");
+#endif
+
+    return DECLINED;
+}
+
+/*  _________________________________________________________________
+**
+**  Authz providers for use with mod_authz_core
+**  _________________________________________________________________
+*/
+
+static authz_status ssl_authz_require_ssl_check(request_rec *r,
+                                                const char *require_line,
+                                                const void *parsed)
+{
+    if (modssl_request_is_tls(r, NULL))
+        return AUTHZ_GRANTED;
+    else
+        return AUTHZ_DENIED;
+}
+
+static const char *ssl_authz_require_ssl_parse(cmd_parms *cmd,
+                                               const char *require_line,
+                                               const void **parsed)
+{
+    if (require_line && require_line[0])
+        return "'Require ssl' does not take arguments";
+
+    return NULL;
+}
+
+const authz_provider ssl_authz_provider_require_ssl =
+{
+    &ssl_authz_require_ssl_check,
+    &ssl_authz_require_ssl_parse,
+};
+
+static authz_status ssl_authz_verify_client_check(request_rec *r,
+                                                  const char *require_line,
+                                                  const void *parsed)
+{
+    SSLConnRec *sslconn = myConnConfig(r->connection);
+    SSL *ssl = sslconn ? sslconn->ssl : NULL;
+
+    if (!ssl)
+        return AUTHZ_DENIED;
+
+    if (sslconn->verify_error == NULL &&
+        sslconn->verify_info == NULL &&
+        SSL_get_verify_result(ssl) == X509_V_OK)
+    {
+        X509 *xs = SSL_get_peer_certificate(ssl);
+
+        if (xs) {
+            X509_free(xs);
+            return AUTHZ_GRANTED;
+        }
+        else {
+            X509_free(xs);
+        }
+    }
+
+    return AUTHZ_DENIED;
+}
+
+static const char *ssl_authz_verify_client_parse(cmd_parms *cmd,
+                                                 const char *require_line,
+                                                 const void **parsed)
+{
+    if (require_line && require_line[0])
+        return "'Require ssl-verify-client' does not take arguments";
+
+    return NULL;
+}
+
+const authz_provider ssl_authz_provider_verify_client =
+{
+    &ssl_authz_verify_client_check,
+    &ssl_authz_verify_client_parse,
+};
+
+
+
+/*  _________________________________________________________________
+**
+**  OpenSSL Callback Functions
+**  _________________________________________________________________
+*/
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+/*
+ * Hand out standard DH parameters, based on the authentication strength
+ */
+DH *ssl_callback_TmpDH(SSL *ssl, int export, int keylen)
+{
+    conn_rec *c = (conn_rec *)SSL_get_app_data(ssl);
+    EVP_PKEY *pkey;
+    int type;
+
+#ifdef SSL_CERT_SET_SERVER
+    /*
+     * When multiple certs/keys are configured for the SSL_CTX: make sure
+     * that we get the private key which is indeed used for the current
+     * SSL connection (available in OpenSSL 1.0.2 or later only)
+     */
+    SSL_set_current_cert(ssl, SSL_CERT_SET_SERVER);
+#endif
+    pkey = SSL_get_privatekey(ssl);
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+    type = pkey ? EVP_PKEY_type(pkey->type) : EVP_PKEY_NONE;
+#else
+    type = pkey ? EVP_PKEY_base_id(pkey) : EVP_PKEY_NONE;
+#endif
+
+    /*
+     * OpenSSL will call us with either keylen == 512 or keylen == 1024
+     * (see the definition of SSL_EXPORT_PKEYLENGTH in ssl_locl.h).
+     * Adjust the DH parameter length according to the size of the
+     * RSA/DSA private key used for the current connection, and always
+     * use at least 1024-bit parameters.
+     * Note: This may cause interoperability issues with implementations
+     * which limit their DH support to 1024 bit - e.g. Java 7 and earlier.
+     * In this case, SSLCertificateFile can be used to specify fixed
+     * 1024-bit DH parameters (with the effect that OpenSSL skips this
+     * callback).
+     */
+    if ((type == EVP_PKEY_RSA) || (type == EVP_PKEY_DSA)) {
+        keylen = EVP_PKEY_bits(pkey);
+    }
+
+    ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
+                  "handing out built-in DH parameters for %d-bit authenticated connection", keylen);
+
+    return modssl_get_dh_params(keylen);
+}
+#endif
+
+/*
+ * This OpenSSL callback function is called when OpenSSL
+ * does client authentication and verifies the certificate chain.
+ */
+int ssl_callback_SSLVerify(int ok, X509_STORE_CTX *ctx)
+{
+    /* Get Apache context back through OpenSSL context */
+    SSL *ssl = X509_STORE_CTX_get_ex_data(ctx,
+                                          SSL_get_ex_data_X509_STORE_CTX_idx());
+    conn_rec *conn      = (conn_rec *)SSL_get_app_data(ssl);
+    request_rec *r      = (request_rec *)modssl_get_app_data2(ssl);
+    server_rec *s       = r ? r->server : mySrvFromConn(conn);
+
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    SSLConnRec *sslconn = myConnConfig(conn);
+    SSLDirConfigRec *dc = r ? myDirConfig(r) : sslconn->dc;
+    modssl_ctx_t *mctx  = myConnCtxConfig(conn, sc);
+    int crl_check_mode  = mctx->crl_check_mask & ~SSL_CRLCHECK_FLAGS;
+
+    /* Get verify ingredients */
+    int errnum   = X509_STORE_CTX_get_error(ctx);
+    int errdepth = X509_STORE_CTX_get_error_depth(ctx);
+    int depth = UNSET;
+    int verify = SSL_CVERIFY_UNSET;
+
+    /*
+     * Log verification information
+     */
+    ssl_log_cxerror(SSLLOG_MARK, APLOG_DEBUG, 0, conn,
+                    X509_STORE_CTX_get_current_cert(ctx), APLOGNO(02275)
+                    "Certificate Verification, depth %d, "
+                    "CRL checking mode: %s (%x)", errdepth,
+                    crl_check_mode == SSL_CRLCHECK_CHAIN ? "chain" :
+                    crl_check_mode == SSL_CRLCHECK_LEAF  ? "leaf"  : "none",
+                    mctx->crl_check_mask);
+
+    /*
+     * Check for optionally acceptable non-verifiable issuer situation
+     */
+    if (dc) {
+        if (conn->outgoing) {
+            verify = dc->proxy->auth.verify_mode;
+        }
+        else {
+            verify = dc->nVerifyClient;
+        }
+    }
+    if (!dc || (verify == SSL_CVERIFY_UNSET)) {
+        verify = mctx->auth.verify_mode;
+    }
+
+    if (verify == SSL_CVERIFY_NONE) {
+        /*
+         * SSLProxyVerify is either not configured or set to "none".
+         * (this callback doesn't happen in the server context if SSLVerify
+         *  is not configured or set to "none")
+         */
+        return TRUE;
+    }
+
+    if (ssl_verify_error_is_optional(errnum) &&
+        (verify == SSL_CVERIFY_OPTIONAL_NO_CA))
+    {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, conn, APLOGNO(02037)
+                      "Certificate Verification: Verifiable Issuer is "
+                      "configured as optional, therefore we're accepting "
+                      "the certificate");
+
+        sslconn->verify_info = "GENEROUS";
+        ok = TRUE;
+    }
+
+    /*
+     * Expired certificates vs. "expired" CRLs: by default, OpenSSL
+     * turns X509_V_ERR_CRL_HAS_EXPIRED into a "certificate_expired(45)"
+     * SSL alert, but that's not really the message we should convey to the
+     * peer (at the very least, it's confusing, and in many cases, it's also
+     * inaccurate, as the certificate itself may very well not have expired
+     * yet). We set the X509_STORE_CTX error to something which OpenSSL's
+     * s3_both.c:ssl_verify_alarm_type() maps to SSL_AD_CERTIFICATE_UNKNOWN,
+     * i.e. the peer will receive a "certificate_unknown(46)" alert.
+     * We do not touch errnum, though, so that later on we will still log
+     * the "real" error, as returned by OpenSSL.
+     */
+    if (!ok && errnum == X509_V_ERR_CRL_HAS_EXPIRED) {
+        X509_STORE_CTX_set_error(ctx, -1);
+    }
+
+    if (!ok && errnum == X509_V_ERR_UNABLE_TO_GET_CRL
+            && (mctx->crl_check_mask & SSL_CRLCHECK_NO_CRL_FOR_CERT_OK)) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, conn,
+                      "Certificate Verification: Temporary error (%d): %s: "
+                      "optional therefore we're accepting the certificate",
+                      errnum, X509_verify_cert_error_string(errnum));
+        X509_STORE_CTX_set_error(ctx, X509_V_OK);
+        errnum = X509_V_OK;
+        ok = TRUE;
+    }
+
+#ifndef OPENSSL_NO_OCSP
+    /*
+     * Perform OCSP-based revocation checks
+     */
+    if (ok && ((mctx->ocsp_mask & SSL_OCSPCHECK_CHAIN) ||
+         (errdepth == 0 && (mctx->ocsp_mask & SSL_OCSPCHECK_LEAF)))) {     
+        /* If there was an optional verification error, it's not
+         * possible to perform OCSP validation since the issuer may be
+         * missing/untrusted.  Fail in that case. */
+        if (ssl_verify_error_is_optional(errnum)) {
+            X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
+            errnum = X509_V_ERR_APPLICATION_VERIFICATION;
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, conn, APLOGNO(02038)
+                          "cannot perform OCSP validation for cert "
+                          "if issuer has not been verified "
+                          "(optional_no_ca configured)");
+            ok = FALSE;
+        } else {
+            ok = modssl_verify_ocsp(ctx, sc, s, conn, conn->pool);
+            if (!ok) {
+                errnum = X509_STORE_CTX_get_error(ctx);
+            }
+        }
+    }
+#endif
+
+    /*
+     * If we already know it's not ok, log the real reason
+     */
+    if (!ok) {
+        if (APLOGcinfo(conn)) {
+            ssl_log_cxerror(SSLLOG_MARK, APLOG_INFO, 0, conn,
+                            X509_STORE_CTX_get_current_cert(ctx), APLOGNO(02276)
+                            "Certificate Verification: Error (%d): %s",
+                            errnum, X509_verify_cert_error_string(errnum));
+        } else {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, conn, APLOGNO(02039)
+                          "Certificate Verification: Error (%d): %s",
+                          errnum, X509_verify_cert_error_string(errnum));
+        }
+
+        if (sslconn->client_cert) {
+            X509_free(sslconn->client_cert);
+            sslconn->client_cert = NULL;
+        }
+        sslconn->client_dn = NULL;
+        sslconn->verify_error = X509_verify_cert_error_string(errnum);
+    }
+
+    /*
+     * Finally check the depth of the certificate verification
+     */
+    if (dc) {
+        if (conn->outgoing) {
+            depth = dc->proxy->auth.verify_depth;
+        }
+        else {
+            depth = dc->nVerifyDepth;
+        }
+    }
+    if (!dc || (depth == UNSET)) {
+        depth = mctx->auth.verify_depth;
+    }
+
+    if (errdepth > depth) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, conn, APLOGNO(02040)
+                      "Certificate Verification: Certificate Chain too long "
+                      "(chain has %d certificates, but maximum allowed are "
+                      "only %d)",
+                      errdepth, depth);
+
+        errnum = X509_V_ERR_CERT_CHAIN_TOO_LONG;
+        sslconn->verify_error = X509_verify_cert_error_string(errnum);
+
+        ok = FALSE;
+    }
+
+    /*
+     * And finally signal OpenSSL the (perhaps changed) state
+     */
+    return ok;
+}
+
+#define SSLPROXY_CERT_CB_LOG_FMT \
+   "Proxy client certificate callback: (%s) "
+
+static void modssl_proxy_info_log(conn_rec *c,
+                                  X509_INFO *info,
+                                  const char *msg)
+{
+    ssl_log_cxerror(SSLLOG_MARK, APLOG_DEBUG, 0, c, info->x509, APLOGNO(02277)
+                    SSLPROXY_CERT_CB_LOG_FMT "%s, sending",
+                    (mySrvConfigFromConn(c))->vhost_id, msg);
+}
+
+/*
+ * caller will decrement the cert and key reference
+ * so we need to increment here to prevent them from
+ * being freed.
+ */
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define modssl_set_cert_info(info, cert, pkey) \
+    *cert = info->x509; \
+    CRYPTO_add(&(*cert)->references, +1, CRYPTO_LOCK_X509); \
+    *pkey = info->x_pkey->dec_pkey; \
+    CRYPTO_add(&(*pkey)->references, +1, CRYPTO_LOCK_EVP_PKEY)
+#else
+#define modssl_set_cert_info(info, cert, pkey) \
+    *cert = info->x509; \
+    X509_up_ref(*cert); \
+    *pkey = info->x_pkey->dec_pkey; \
+    EVP_PKEY_up_ref(*pkey);
+#endif
+
+int ssl_callback_proxy_cert(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
+{
+    conn_rec *c = (conn_rec *)SSL_get_app_data(ssl);
+    server_rec *s = mySrvFromConn(c);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    SSLDirConfigRec *dc = myDirConfigFromConn(c);
+    X509_NAME *ca_name, *issuer, *ca_issuer;
+    X509_INFO *info;
+    X509 *ca_cert;
+    STACK_OF(X509_NAME) *ca_list;
+    STACK_OF(X509_INFO) *certs;
+    STACK_OF(X509) *ca_certs;
+    STACK_OF(X509) **ca_cert_chains;
+    int i, j, k;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02267)
+                 SSLPROXY_CERT_CB_LOG_FMT "entered",
+                 sc->vhost_id);
+
+    certs = (dc && dc->proxy) ? dc->proxy->pkp->certs : NULL;
+    if (!certs || (sk_X509_INFO_num(certs) <= 0)) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(02268)
+                     SSLPROXY_CERT_CB_LOG_FMT
+                     "downstream server wanted client certificate "
+                     "but none are configured", sc->vhost_id);
+        return FALSE;
+    }
+
+    ca_list = SSL_get_client_CA_list(ssl);
+
+    if (!ca_list || (sk_X509_NAME_num(ca_list) <= 0)) {
+        /*
+         * downstream server didn't send us a list of acceptable CA certs,
+         * so we send the first client cert in the list.
+         */
+        info = sk_X509_INFO_value(certs, 0);
+
+        modssl_proxy_info_log(c, info, APLOGNO(02278) "no acceptable CA list");
+
+        modssl_set_cert_info(info, x509, pkey);
+
+        return TRUE;
+    }
+
+    ca_cert_chains = dc->proxy->pkp->ca_certs;
+    for (i = 0; i < sk_X509_NAME_num(ca_list); i++) {
+        ca_name = sk_X509_NAME_value(ca_list, i);
+
+        for (j = 0; j < sk_X509_INFO_num(certs); j++) {
+            info = sk_X509_INFO_value(certs, j);
+            issuer = X509_get_issuer_name(info->x509);
+
+            /* Search certs (by issuer name) one by one*/
+            if (X509_NAME_cmp(issuer, ca_name) == 0) {
+                modssl_proxy_info_log(c, info, APLOGNO(02279)
+                                      "found acceptable cert");
+
+                modssl_set_cert_info(info, x509, pkey);
+
+                return TRUE;
+            }
+
+            if (ca_cert_chains) {
+                /*
+                 * Failed to find direct issuer - search intermediates
+                 * (by issuer name), if provided.
+                 */
+                ca_certs = ca_cert_chains[j];
+                for (k = 0; k < sk_X509_num(ca_certs); k++) {
+                    ca_cert = sk_X509_value(ca_certs, k);
+                    ca_issuer = X509_get_issuer_name(ca_cert);
+
+                    if(X509_NAME_cmp(ca_issuer, ca_name) == 0 ) {
+                        modssl_proxy_info_log(c, info, APLOGNO(02280)
+                                              "found acceptable cert by intermediate CA");
+
+                        modssl_set_cert_info(info, x509, pkey);
+
+                        return TRUE;
+                    }
+                } /* end loop through chained certs */
+            }
+        } /* end loop through available certs */
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02269)
+                 SSLPROXY_CERT_CB_LOG_FMT
+                 "no client certificate found!?", sc->vhost_id);
+
+    return FALSE;
+}
+
+static void ssl_session_log(server_rec *s,
+                            const char *request,
+                            IDCONST unsigned char *id,
+                            unsigned int idlen,
+                            const char *status,
+                            const char *result,
+                            long timeout)
+{
+    char buf[MODSSL_SESSION_ID_STRING_LEN];
+    char timeout_str[56] = {'\0'};
+
+    if (!APLOGdebug(s)) {
+        return;
+    }
+
+    if (timeout) {
+        apr_snprintf(timeout_str, sizeof(timeout_str),
+                     "timeout=%lds ", timeout);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s,
+                 "Inter-Process Session Cache: "
+                 "request=%s status=%s id=%s %s(session %s)",
+                 request, status,
+                 modssl_SSL_SESSION_id2sz(id, idlen, buf, sizeof(buf)),
+                 timeout_str, result);
+}
+
+/*
+ *  This callback function is executed by OpenSSL whenever a new SSL_SESSION is
+ *  added to the internal OpenSSL session cache. We use this hook to spread the
+ *  SSL_SESSION also to the inter-process disk-cache to make share it with our
+ *  other Apache pre-forked server processes.
+ */
+int ssl_callback_NewSessionCacheEntry(SSL *ssl, SSL_SESSION *session)
+{
+    /* Get Apache context back through OpenSSL context */
+    conn_rec *conn      = (conn_rec *)SSL_get_app_data(ssl);
+    server_rec *s       = mySrvFromConn(conn);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    long timeout        = sc->session_cache_timeout;
+    BOOL rc;
+    IDCONST unsigned char *id;
+    unsigned int idlen;
+
+    /*
+     * Set the timeout also for the internal OpenSSL cache, because this way
+     * our inter-process cache is consulted only when it's really necessary.
+     */
+    SSL_set_timeout(session, timeout);
+
+    /*
+     * Store the SSL_SESSION in the inter-process cache with the
+     * same expire time, so it expires automatically there, too.
+     */
+#ifdef OPENSSL_NO_SSL_INTERN
+    id = (unsigned char *)SSL_SESSION_get_id(session, &idlen);
+#else
+    id = session->session_id;
+    idlen = session->session_id_length;
+#endif
+
+    rc = ssl_scache_store(s, id, idlen,
+                          apr_time_from_sec(SSL_SESSION_get_time(session)
+                                          + timeout),
+                          session, conn->pool);
+
+    ssl_session_log(s, "SET", id, idlen,
+                    rc == TRUE ? "OK" : "BAD",
+                    "caching", timeout);
+
+    /*
+     * return 0 which means to OpenSSL that the session is still
+     * valid and was not freed by us with SSL_SESSION_free().
+     */
+    return 0;
+}
+
+/*
+ *  This callback function is executed by OpenSSL whenever a
+ *  SSL_SESSION is looked up in the internal OpenSSL cache and it
+ *  was not found. We use this to lookup the SSL_SESSION in the
+ *  inter-process disk-cache where it was perhaps stored by one
+ *  of our other Apache pre-forked server processes.
+ */
+SSL_SESSION *ssl_callback_GetSessionCacheEntry(SSL *ssl,
+                                               IDCONST unsigned char *id,
+                                               int idlen, int *do_copy)
+{
+    /* Get Apache context back through OpenSSL context */
+    conn_rec *conn = (conn_rec *)SSL_get_app_data(ssl);
+    server_rec *s  = mySrvFromConn(conn);
+    SSL_SESSION *session;
+
+    /*
+     * Try to retrieve the SSL_SESSION from the inter-process cache
+     */
+    session = ssl_scache_retrieve(s, id, idlen, conn->pool);
+
+    ssl_session_log(s, "GET", id, idlen,
+                    session ? "FOUND" : "MISSED",
+                    session ? "reuse" : "renewal", 0);
+
+    /*
+     * Return NULL or the retrieved SSL_SESSION. But indicate (by
+     * setting do_copy to 0) that the reference count on the
+     * SSL_SESSION should not be incremented by the SSL library,
+     * because we will no longer hold a reference to it ourself.
+     */
+    *do_copy = 0;
+
+    return session;
+}
+
+/*
+ *  This callback function is executed by OpenSSL whenever a
+ *  SSL_SESSION is removed from the internal OpenSSL cache.
+ *  We use this to remove the SSL_SESSION in the inter-process
+ *  disk-cache, too.
+ */
+void ssl_callback_DelSessionCacheEntry(SSL_CTX *ctx,
+                                       SSL_SESSION *session)
+{
+    server_rec *s;
+    SSLSrvConfigRec *sc;
+    IDCONST unsigned char *id;
+    unsigned int idlen;
+
+    /*
+     * Get Apache context back through OpenSSL context
+     */
+    if (!(s = (server_rec *)SSL_CTX_get_app_data(ctx))) {
+        return; /* on server shutdown Apache is already gone */
+    }
+
+    sc = mySrvConfig(s);
+
+    /*
+     * Remove the SSL_SESSION from the inter-process cache
+     */
+#ifdef OPENSSL_NO_SSL_INTERN
+    id = (unsigned char *)SSL_SESSION_get_id(session, &idlen);
+#else
+    id = session->session_id;
+    idlen = session->session_id_length;
+#endif
+
+    /* TODO: Do we need a temp pool here, or are we always shutting down? */
+    ssl_scache_remove(s, id, idlen, sc->mc->pPool);
+
+    ssl_session_log(s, "REM", id, idlen,
+                    "OK", "dead", 0);
+
+    return;
+}
+
+/* Dump debugginfo trace to the log file. */
+static void log_tracing_state(const SSL *ssl, conn_rec *c,
+                              server_rec *s, int where, int rc)
+{
+    /*
+     * create the various trace messages
+     */
+    if (where & SSL_CB_HANDSHAKE_START) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Handshake: start", MODSSL_LIBRARY_NAME);
+    }
+    else if (where & SSL_CB_HANDSHAKE_DONE) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Handshake: done", MODSSL_LIBRARY_NAME);
+    }
+    else if (where & SSL_CB_LOOP) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Loop: %s",
+                      MODSSL_LIBRARY_NAME, SSL_state_string_long(ssl));
+    }
+    else if (where & SSL_CB_READ) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Read: %s",
+                      MODSSL_LIBRARY_NAME, SSL_state_string_long(ssl));
+    }
+    else if (where & SSL_CB_WRITE) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Write: %s",
+                      MODSSL_LIBRARY_NAME, SSL_state_string_long(ssl));
+    }
+    else if (where & SSL_CB_ALERT) {
+        char *str = (where & SSL_CB_READ) ? "read" : "write";
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                      "%s: Alert: %s:%s:%s",
+                      MODSSL_LIBRARY_NAME, str,
+                      SSL_alert_type_string_long(rc),
+                      SSL_alert_desc_string_long(rc));
+    }
+    else if (where & SSL_CB_EXIT) {
+        if (rc == 0) {
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                          "%s: Exit: failed in %s",
+                          MODSSL_LIBRARY_NAME, SSL_state_string_long(ssl));
+        }
+        else if (rc < 0) {
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE3, 0, c,
+                          "%s: Exit: error in %s",
+                          MODSSL_LIBRARY_NAME, SSL_state_string_long(ssl));
+        }
+    }
+
+    /*
+     * Because SSL renegotiations can happen at any time (not only after
+     * SSL_accept()), the best way to log the current connection details is
+     * right after a finished handshake.
+     */
+    if (where & SSL_CB_HANDSHAKE_DONE) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02041)
+                      "Protocol: %s, Cipher: %s (%s/%s bits)",
+                      ssl_var_lookup(NULL, s, c, NULL, "SSL_PROTOCOL"),
+                      ssl_var_lookup(NULL, s, c, NULL, "SSL_CIPHER"),
+                      ssl_var_lookup(NULL, s, c, NULL, "SSL_CIPHER_USEKEYSIZE"),
+                      ssl_var_lookup(NULL, s, c, NULL, "SSL_CIPHER_ALGKEYSIZE"));
+    }
+}
+
+/*
+ * This callback function is executed while OpenSSL processes the SSL
+ * handshake and does SSL record layer stuff.  It's used to trap
+ * client-initiated renegotiations, and for dumping everything to the
+ * log.
+ */
+void ssl_callback_Info(const SSL *ssl, int where, int rc)
+{
+    conn_rec *c;
+    server_rec *s;
+
+    /* Retrieve the conn_rec and the associated SSLConnRec. */
+    if ((c = (conn_rec *)SSL_get_app_data((SSL *)ssl)) == NULL) {
+        return;
+    }
+
+    /* With TLS 1.3 this callback may be called multiple times on the first
+     * negotiation, so the below logic to detect renegotiations can't work.
+     * Fortunately renegotiations are forbidden starting with TLS 1.3, and
+     * this is enforced by OpenSSL so there's nothing to be done here.
+     */
+#if SSL_HAVE_PROTOCOL_TLSV1_3
+    if (SSL_version(ssl) < TLS1_3_VERSION)
+#endif
+    {
+        SSLConnRec *sslconn;
+
+        if ((sslconn = myConnConfig(c)) == NULL) {
+            return;
+        }
+
+        /* If the reneg state is to reject renegotiations, check the SSL
+         * state machine and move to ABORT if a Client Hello is being
+         * read. */
+        if (!c->outgoing &&
+                (where & SSL_CB_HANDSHAKE_START) &&
+                sslconn->reneg_state == RENEG_REJECT) {
+            sslconn->reneg_state = RENEG_ABORT;
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02042)
+                          "rejecting client initiated renegotiation");
+        }
+        /* If the first handshake is complete, change state to reject any
+         * subsequent client-initiated renegotiation. */
+        else if ((where & SSL_CB_HANDSHAKE_DONE)
+                 && sslconn->reneg_state == RENEG_INIT) {
+            sslconn->reneg_state = RENEG_REJECT;
+        }
+    }
+
+    s = mySrvFromConn(c);
+    if (s && APLOGdebug(s)) {
+        log_tracing_state(ssl, c, s, where, rc);
+    }
+}
+
+#ifdef HAVE_TLSEXT
+
+static apr_status_t set_challenge_creds(conn_rec *c, const char *servername,
+                                        SSL *ssl, X509 *cert, EVP_PKEY *key,
+                                        const char *cert_pem, const char *key_pem)
+{
+    SSLConnRec *sslcon = myConnConfig(c);
+    apr_status_t rv = APR_SUCCESS;
+    int our_data = 0;
+    
+    sslcon->service_unavailable = 1;
+    if (cert_pem) {
+        cert = NULL;
+        key = NULL;
+        our_data = 1;
+        
+        rv = modssl_read_cert(c->pool, cert_pem, key_pem, NULL, NULL, &cert, &key);
+        if (rv != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(10266)
+                          "Failed to parse PEM of challenge certificate %s",
+                          servername);
+            goto cleanup;
+        }
+    }
+    
+    if ((SSL_use_certificate(ssl, cert) < 1)) {
+        ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(10086)
+                      "Failed to configure challenge certificate %s",
+                      servername);
+        rv = APR_EGENERAL;
+        goto cleanup;
+    }
+    
+    if (!SSL_use_PrivateKey(ssl, key)) {
+        ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(10087)
+                      "error '%s' using Challenge key: %s",
+                      ERR_error_string(ERR_peek_last_error(), NULL), 
+                      servername);
+        rv = APR_EGENERAL;
+        goto cleanup;
+    }
+    
+    if (SSL_check_private_key(ssl) < 1) {
+        ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(10088)
+                      "Challenge certificate and private key %s "
+                      "do not match", servername);
+        rv = APR_EGENERAL;
+        goto cleanup;
+    }
+    
+cleanup:
+    if (our_data && cert) X509_free(cert);
+    if (our_data && key) EVP_PKEY_free(key);
+    return APR_SUCCESS;
+}
+  
+/*
+ * This function sets the virtual host from an extended
+ * client hello with a server name indication extension ("SNI", cf. RFC 6066).
+ */
+static apr_status_t init_vhost(conn_rec *c, SSL *ssl, const char *servername)
+{
+    if (c) {
+        SSLConnRec *sslcon = myConnConfig(c);
+
+        if (sslcon->vhost_found) {
+            /* already found the vhost? */
+            return sslcon->vhost_found > 0 ? APR_SUCCESS : APR_NOTFOUND;
+        }
+        sslcon->vhost_found = -1;
+        
+        if (!servername) {
+            servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
+        }
+        if (servername) {
+            if (ap_vhost_iterate_given_conn(c, ssl_find_vhost,
+                                            (void *)servername)) {
+                ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02043)
+                              "SSL virtual host for servername %s found",
+                              servername);
+
+                sslcon->vhost_found = +1;
+                return APR_SUCCESS;
+            }
+            else {
+                ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02044)
+                              "No matching SSL virtual host for servername "
+                              "%s found (using default/first virtual host)",
+                              servername);
+                /*
+                 * RFC 6066 section 3 says "It is NOT RECOMMENDED to send
+                 * a warning-level unrecognized_name(112) alert, because
+                 * the client's behavior in response to warning-level alerts
+                 * is unpredictable."
+                 *
+                 * To maintain backwards compatibility in mod_ssl, we
+                 * no longer send any alert (neither warning- nor fatal-level),
+                 * i.e. we take the second action suggested in RFC 6066:
+                 * "If the server understood the ClientHello extension but
+                 * does not recognize the server name, the server SHOULD take
+                 * one of two actions: either abort the handshake by sending
+                 * a fatal-level unrecognized_name(112) alert or continue
+                 * the handshake."
+                 */
+            }
+        }
+        else {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02645)
+                          "Server name not provided via TLS extension "
+                          "(using default/first virtual host)");
+        }
+    }
+    
+    return APR_NOTFOUND;
+}
+
+/*
+ * This callback function is executed when OpenSSL encounters an extended
+ * client hello with a server name indication extension ("SNI", cf. RFC 6066).
+ */
+int ssl_callback_ServerNameIndication(SSL *ssl, int *al, modssl_ctx_t *mctx)
+{
+    conn_rec *c = (conn_rec *)SSL_get_app_data(ssl);
+    apr_status_t status = init_vhost(c, ssl, NULL);
+    
+    return (status == APR_SUCCESS)? SSL_TLSEXT_ERR_OK : SSL_TLSEXT_ERR_NOACK;
+}
+
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+/*
+ * This callback function is called when the ClientHello is received.
+ */
+int ssl_callback_ClientHello(SSL *ssl, int *al, void *arg)
+{
+    char *servername = NULL;
+    conn_rec *c = (conn_rec *)SSL_get_app_data(ssl);
+    const unsigned char *pos;
+    size_t len, remaining;
+    (void)arg;
+ 
+    /* We can't use SSL_get_servername() at this earliest OpenSSL connection
+     * stage, and there is no SSL_client_hello_get0_servername() provided as
+     * of OpenSSL 1.1.1. So the code below, that extracts the SNI from the
+     * ClientHello's TLS extensions, is taken from some test code in OpenSSL,
+     * i.e. client_hello_select_server_ctx() in "test/handshake_helper.c".
+     */
+
+    /*
+     * The server_name extension was given too much extensibility when it
+     * was written, so parsing the normal case is a bit complex.
+     */
+    if (!SSL_client_hello_get0_ext(ssl, TLSEXT_TYPE_server_name, &pos,
+                                   &remaining)
+            || remaining <= 2) 
+        goto give_up;
+
+    /* Extract the length of the supplied list of names. */
+    len = (*(pos++) << 8);
+    len += *(pos++);
+    if (len + 2 != remaining)
+        goto give_up;
+    remaining = len;
+
+    /*
+     * The list in practice only has a single element, so we only consider
+     * the first one.
+     */
+    if (remaining <= 3 || *pos++ != TLSEXT_NAMETYPE_host_name)
+        goto give_up;
+    remaining--;
+
+    /* Now we can finally pull out the byte array with the actual hostname. */
+    len = (*(pos++) << 8);
+    len += *(pos++);
+    if (len + 2 != remaining)
+        goto give_up;
+
+    /* Use the SNI to switch to the relevant vhost, should it differ from
+     * c->base_server.
+     */
+    servername = apr_pstrmemdup(c->pool, (const char *)pos, len);
+
+give_up:
+    init_vhost(c, ssl, servername);
+    return SSL_CLIENT_HELLO_SUCCESS;
+}
+#endif /* OPENSSL_VERSION_NUMBER < 0x10101000L */
+
+/*
+ * Find a (name-based) SSL virtual host where either the ServerName
+ * or one of the ServerAliases matches the supplied name (to be used
+ * with ap_vhost_iterate_given_conn())
+ */
+static int ssl_find_vhost(void *servername, conn_rec *c, server_rec *s)
+{
+    SSLSrvConfigRec *sc;
+    SSL *ssl;
+    BOOL found;
+    SSLConnRec *sslcon;
+
+    found = ssl_util_vhost_matches(servername, s);
+
+    /* set SSL_CTX (if matched) */
+    sslcon = myConnConfig(c);
+    if (found && (ssl = sslcon->ssl) &&
+        (sc = mySrvConfig(s))) {
+        SSL_CTX *ctx = SSL_set_SSL_CTX(ssl, sc->server->ssl_ctx);
+
+        /*
+         * SSL_set_SSL_CTX() only deals with the server cert,
+         * so we need to duplicate a few additional settings
+         * from the ctx by hand
+         */
+        SSL_set_options(ssl, SSL_CTX_get_options(ctx));
+#if OPENSSL_VERSION_NUMBER >= 0x1010007fL \
+        && (!defined(LIBRESSL_VERSION_NUMBER) \
+            || LIBRESSL_VERSION_NUMBER >= 0x20800000L)
+        /*
+         * Don't switch the protocol if none is configured for this vhost,
+         * the default in this case is still the base server's SSLProtocol.
+         */
+        if (myConnCtxConfig(c, sc)->protocol_set) {
+            SSL_set_min_proto_version(ssl, SSL_CTX_get_min_proto_version(ctx));
+            SSL_set_max_proto_version(ssl, SSL_CTX_get_max_proto_version(ctx));
+        }
+#endif
+        if ((SSL_get_verify_mode(ssl) == SSL_VERIFY_NONE) ||
+            (SSL_num_renegotiations(ssl) == 0)) {
+           /*
+            * Only initialize the verification settings from the ctx
+            * if they are not yet set, or if we're called when a new
+            * SSL connection is set up (num_renegotiations == 0).
+            * Otherwise, we would possibly reset a per-directory
+            * configuration which was put into effect by ssl_hook_Access.
+            */
+            SSL_set_verify(ssl, SSL_CTX_get_verify_mode(ctx),
+                           SSL_CTX_get_verify_callback(ctx));
+        }
+
+        /*
+         * Adjust the session id context. ssl_init_ssl_connection()
+         * always picks the configuration of the first vhost when
+         * calling SSL_new(), but we want to tie the session to the
+         * vhost we have just switched to. Again, we have to make sure
+         * that we're not overwriting a session id context which was
+         * possibly set in ssl_hook_Access(), before triggering
+         * a renegotiation.
+         */
+        if (SSL_num_renegotiations(ssl) == 0) {
+            unsigned char *sid_ctx =
+                (unsigned char *)ap_md5_binary(c->pool,
+                                               (unsigned char *)sc->vhost_id,
+                                               sc->vhost_id_len);
+            SSL_set_session_id_context(ssl, sid_ctx, APR_MD5_DIGESTSIZE*2);
+        }
+
+        /*
+         * Save the found server into our SSLConnRec for later
+         * retrieval
+         */
+        sslcon->server = s;
+        sslcon->cipher_suite = sc->server->auth.cipher_suite;
+        sslcon->service_unavailable = sc->server->pks? 
+            sc->server->pks->service_unavailable : 0; 
+        
+        ap_update_child_status_from_server(c->sbh, SERVER_BUSY_READ, c, s);
+        /*
+         * There is one special filter callback, which is set
+         * very early depending on the base_server's log level.
+         * If this is not the first vhost we're now selecting
+         * (and the first vhost doesn't use APLOG_TRACE4), then
+         * we need to set that callback here.
+         */
+        if (APLOGtrace4(s)) {
+            BIO *rbio = SSL_get_rbio(ssl),
+                *wbio = SSL_get_wbio(ssl);
+            BIO_set_callback(rbio, ssl_io_data_cb);
+            BIO_set_callback_arg(rbio, (void *)ssl);
+            if (wbio && wbio != rbio) {
+                BIO_set_callback(wbio, ssl_io_data_cb);
+                BIO_set_callback_arg(wbio, (void *)ssl);
+            }
+        }
+
+        return 1;
+    }
+
+    return 0;
+}
+#endif /* HAVE_TLSEXT */
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+/*
+ * This callback function is executed when OpenSSL needs a key for encrypting/
+ * decrypting a TLS session ticket (RFC 5077) and a ticket key file has been
+ * configured through SSLSessionTicketKeyFile.
+ */
+int ssl_callback_SessionTicket(SSL *ssl,
+                               unsigned char *keyname,
+                               unsigned char *iv,
+                               EVP_CIPHER_CTX *cipher_ctx,
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+                               HMAC_CTX *hmac_ctx,
+#else
+                               EVP_MAC_CTX *mac_ctx,
+#endif
+                               int mode)
+{
+    conn_rec *c = (conn_rec *)SSL_get_app_data(ssl);
+    server_rec *s = mySrvFromConn(c);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    modssl_ctx_t *mctx = myConnCtxConfig(c, sc);
+    modssl_ticket_key_t *ticket_key = mctx->ticket_key;
+
+    if (mode == 1) {
+        /* 
+         * OpenSSL is asking for a key for encrypting a ticket,
+         * see s3_srvr.c:ssl3_send_newsession_ticket()
+         */
+
+        if (ticket_key == NULL) {
+            /* should never happen, but better safe than sorry */
+            return -1;
+        }
+
+        memcpy(keyname, ticket_key->key_name, 16);
+        if (RAND_bytes(iv, EVP_MAX_IV_LENGTH) != 1) {
+            return -1;
+        }
+        EVP_EncryptInit_ex(cipher_ctx, EVP_aes_128_cbc(), NULL,
+                           ticket_key->aes_key, iv);
+
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+        HMAC_Init_ex(hmac_ctx, ticket_key->hmac_secret, 16,
+                     tlsext_tick_md(), NULL);
+#else
+        EVP_MAC_CTX_set_params(mac_ctx, ticket_key->mac_params);
+#endif
+
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02289)
+                      "TLS session ticket key for %s successfully set, "
+                      "creating new session ticket", sc->vhost_id);
+
+        return 1;
+    }
+    else if (mode == 0) {
+        /* 
+         * OpenSSL is asking for the decryption key,
+         * see t1_lib.c:tls_decrypt_ticket()
+         */
+
+        /* check key name */
+        if (ticket_key == NULL || memcmp(keyname, ticket_key->key_name, 16)) {
+            return 0;
+        }
+
+        EVP_DecryptInit_ex(cipher_ctx, EVP_aes_128_cbc(), NULL,
+                           ticket_key->aes_key, iv);
+
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+        HMAC_Init_ex(hmac_ctx, ticket_key->hmac_secret, 16,
+                     tlsext_tick_md(), NULL);
+#else
+        EVP_MAC_CTX_set_params(mac_ctx, ticket_key->mac_params);
+#endif
+
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02290)
+                      "TLS session ticket key for %s successfully set, "
+                      "decrypting existing session ticket", sc->vhost_id);
+
+        return 1;
+    }
+
+    /* OpenSSL is not expected to call us with modes other than 1 or 0 */
+    return -1;
+}
+#endif /* HAVE_TLS_SESSION_TICKETS */
+
+#ifdef HAVE_TLS_ALPN
+
+/*
+ * This callback function is executed when the TLS Application-Layer
+ * Protocol Negotiation Extension (ALPN, RFC 7301) is triggered by the Client
+ * Hello, giving a list of desired protocol names (in descending preference) 
+ * to the server.
+ * The callback has to select a protocol name or return an error if none of
+ * the clients preferences is supported.
+ * The selected protocol does not have to be on the client list, according
+ * to RFC 7301, so no checks are performed.
+ * The client protocol list is serialized as length byte followed by ASCII
+ * characters (not null-terminated), followed by the next protocol name.
+ */
+int ssl_callback_alpn_select(SSL *ssl,
+                             const unsigned char **out, unsigned char *outlen,
+                             const unsigned char *in, unsigned int inlen,
+                             void *arg)
+{
+    conn_rec *c = (conn_rec*)SSL_get_app_data(ssl);
+    SSLConnRec *sslconn;
+    apr_array_header_t *client_protos;
+    const char *proposed;
+    size_t len;
+    int i;
+
+    /* If the connection object is not available,
+     * then there's nothing for us to do. */
+    if (c == NULL) {
+        return SSL_TLSEXT_ERR_OK;
+    }
+    sslconn = myConnConfig(c);
+
+    if (inlen == 0) {
+        /* someone tries to trick us? */
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02837)
+                      "ALPN client protocol list empty");
+        return SSL_TLSEXT_ERR_ALERT_FATAL;
+    }
+
+    client_protos = apr_array_make(c->pool, 0, sizeof(char *));
+    for (i = 0; i < inlen; /**/) {
+        unsigned int plen = in[i++];
+        if (plen + i > inlen) {
+            /* someone tries to trick us? */
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02838)
+                          "ALPN protocol identifier too long");
+            return SSL_TLSEXT_ERR_ALERT_FATAL;
+        }
+        APR_ARRAY_PUSH(client_protos, char *) =
+            apr_pstrndup(c->pool, (const char *)in+i, plen);
+        i += plen;
+    }
+
+    /* The order the callbacks are invoked from TLS extensions is, unfortunately
+     * not defined and older openssl versions do call ALPN selection before
+     * they callback the SNI. We need to make sure that we know which vhost
+     * we are dealing with so we respect the correct protocols.
+     */
+    init_vhost(c, ssl, NULL);
+    
+    proposed = ap_select_protocol(c, NULL, sslconn->server, client_protos);
+    if (!proposed) {
+        proposed = ap_get_protocol(c);
+    }
+    
+    len = strlen(proposed);
+    if (len > 255) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02840)
+                      "ALPN negotiated protocol name too long");
+        return SSL_TLSEXT_ERR_ALERT_FATAL;
+    }
+    *out = (const unsigned char *)proposed;
+    *outlen = (unsigned char)len;
+        
+    if (strcmp(proposed, ap_get_protocol(c))) {
+        apr_status_t status;
+        
+        status = ap_switch_protocol(c, NULL, sslconn->server, proposed);
+        if (status != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, status, c,
+                          APLOGNO(02908) "protocol switch to '%s' failed",
+                          proposed);
+            return SSL_TLSEXT_ERR_ALERT_FATAL;
+        }
+        
+        /* protocol was switched, this could be a challenge protocol such as "acme-tls/1".
+         * For that to work, we need to allow overrides to our ssl certificate. 
+         * However, exclude challenge checks on our best known traffic protocol.
+         * (http/1.1 is the default, we never switch to it anyway.)
+         */
+        if (strcmp("h2", proposed)) {
+            const char *servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
+            X509 *cert;
+            EVP_PKEY *key;
+            const char *cert_pem, *key_pem;
+
+            if (ssl_is_challenge(c, servername, &cert, &key, &cert_pem, &key_pem)) {
+                if (set_challenge_creds(c, servername, ssl, cert, key, 
+                                        cert_pem, key_pem) != APR_SUCCESS) {
+                    return SSL_TLSEXT_ERR_ALERT_FATAL;
+                }
+                SSL_set_verify(ssl, SSL_VERIFY_NONE, ssl_callback_SSLVerify);
+            }
+        }
+    }
+
+    return SSL_TLSEXT_ERR_OK;
+}
+#endif /* HAVE_TLS_ALPN */
+
+#ifdef HAVE_SRP
+
+int ssl_callback_SRPServerParams(SSL *ssl, int *ad, void *arg)
+{
+    modssl_ctx_t *mctx = (modssl_ctx_t *)arg;
+    char *username = SSL_get_srp_username(ssl);
+    SRP_user_pwd *u;
+
+    if (username == NULL
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+        || (u = SRP_VBASE_get_by_user(mctx->srp_vbase, username)) == NULL) {
+#else
+        || (u = SRP_VBASE_get1_by_user(mctx->srp_vbase, username)) == NULL) {
+#endif
+        *ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
+        return SSL3_AL_FATAL;
+    }
+
+    if (SSL_set_srp_server_param(ssl, u->N, u->g, u->s, u->v, u->info) < 0) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+        SRP_user_pwd_free(u);
+#endif
+        *ad = SSL_AD_INTERNAL_ERROR;
+        return SSL3_AL_FATAL;
+    }
+
+    /* reset all other options */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+    SRP_user_pwd_free(u);
+#endif
+    SSL_set_verify(ssl, SSL_VERIFY_NONE,  ssl_callback_SSLVerify);
+    return SSL_ERROR_NONE;
+}
+
+#endif /* HAVE_SRP */
+
+
+#ifdef HAVE_OPENSSL_KEYLOG
+/* Callback used with SSL_CTX_set_keylog_callback. */
+void modssl_callback_keylog(const SSL *ssl, const char *line)
+{
+    conn_rec *conn = SSL_get_app_data(ssl);
+    SSLSrvConfigRec *sc = mySrvConfig(conn->base_server);
+
+    if (sc && sc->mc->keylog_file) {
+        apr_file_printf(sc->mc->keylog_file, "%s\n", line);
+    }
+}
+#endif
diff --git a/modules/ssl/ssl_engine_log.c b/modules/ssl/ssl_engine_log.c
new file mode 100644
index 0000000..3b3ceac
--- /dev/null
+++ b/modules/ssl/ssl_engine_log.c
@@ -0,0 +1,246 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_log.c
+ *  Logging Facility
+ */
+                             /* ``The difference between a computer
+                                  industry job and open-source software
+                                  hacking is about 30 hours a week.''
+                                         -- Ralf S. Engelschall     */
+#include "ssl_private.h"
+
+/*  _________________________________________________________________
+**
+**  Logfile Support
+**  _________________________________________________________________
+*/
+
+static const struct {
+    const char *cpPattern;
+    const char *cpAnnotation;
+} ssl_log_annotate[] = {
+    { "*envelope*bad*decrypt*", "wrong pass phrase!?" },
+    { "*CLIENT_HELLO*unknown*protocol*", "speaking not SSL to HTTPS port!?" },
+    { "*CLIENT_HELLO*http*request*", "speaking HTTP to HTTPS port!?" },
+    { "*SSL3_READ_BYTES:sslv3*alert*bad*certificate*", "Subject CN in certificate not server name or identical to CA!?" },
+    { "*self signed certificate in certificate chain*", "Client certificate signed by CA not known to server?" },
+    { "*peer did not return a certificate*", "No CAs known to server for verification?" },
+    { "*no shared cipher*", "Too restrictive SSLCipherSuite or using DSA server certificate?" },
+    { "*no start line*", "Bad file contents or format - or even just a forgotten SSLCertificateKeyFile?" },
+    { "*bad password read*", "You entered an incorrect pass phrase!?" },
+    { "*bad mac decode*", "Browser still remembered details of a re-created server certificate?" },
+    { NULL, NULL }
+};
+
+static const char *ssl_log_annotation(const char *error)
+{
+    int i = 0;
+
+    while (ssl_log_annotate[i].cpPattern != NULL
+           && ap_strcmp_match(error, ssl_log_annotate[i].cpPattern) != 0)
+        i++;
+
+    return ssl_log_annotate[i].cpAnnotation;
+}
+
+apr_status_t ssl_die(server_rec *s)
+{
+    if (s != NULL && s->is_virtual && s->error_fname != NULL)
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, NULL, APLOGNO(02311)
+                     "Fatal error initialising mod_ssl, exiting. "
+                     "See %s for more information",
+                     ap_server_root_relative(s->process->pool,
+                                             s->error_fname));
+    else
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, NULL, APLOGNO(02312)
+                     "Fatal error initialising mod_ssl, exiting.");
+
+    return APR_EGENERAL;
+}
+
+static APR_INLINE
+unsigned long modssl_ERR_peek_error_data(const char **data, int *flags)
+{
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    return ERR_peek_error_line_data(NULL, NULL, data, flags);
+#else
+    return ERR_peek_error_data(data, flags);
+#endif
+}
+
+/*
+ * Prints the SSL library error information.
+ */
+void ssl_log_ssl_error(const char *file, int line, int level, server_rec *s)
+{
+    unsigned long e;
+    const char *data;
+    int flags;
+
+    while ((e = modssl_ERR_peek_error_data(&data, &flags))) {
+        const char *annotation;
+        char err[256];
+
+        if (!(flags & ERR_TXT_STRING)) {
+            data = NULL;
+        }
+
+        ERR_error_string_n(e, err, sizeof err);
+        annotation = ssl_log_annotation(err);
+
+        ap_log_error(file, line, APLOG_MODULE_INDEX, level, 0, s,
+                     "SSL Library Error: %s%s%s%s%s%s",
+                     /* %s */
+                     err,
+                     /* %s%s%s */
+                     data ? " (" : "", data ? data : "", data ? ")" : "",
+                     /* %s%s */
+                     annotation ? " -- " : "",
+                     annotation ? annotation : "");
+
+        /* Pop the error off the stack: */
+        ERR_get_error();
+    }
+}
+
+static void ssl_log_cert_error(const char *file, int line, int level,
+                               apr_status_t rv, const server_rec *s,
+                               const conn_rec *c, const request_rec *r,
+                               apr_pool_t *p, X509 *cert, const char *format,
+                               va_list ap)
+{
+    char buf[HUGE_STRING_LEN];
+    int msglen, n;
+    char *name;
+
+    msglen = apr_vsnprintf(buf, sizeof buf, format, ap);
+    
+    if (cert) {
+        BIO *bio = BIO_new(BIO_s_mem());
+
+        if (bio) {
+            /*
+             * Limit the maximum length of the subject and issuer DN strings
+             * in the log message. 300 characters should always be sufficient
+             * for holding both the timestamp, module name, pid etc. stuff
+             * at the beginning of the line and the trailing information about
+             * serial, notbefore and notafter.
+             */
+            int maxdnlen = (HUGE_STRING_LEN - msglen - 300) / 2;
+
+            BIO_puts(bio, " [subject: ");
+            name = modssl_X509_NAME_to_string(p, X509_get_subject_name(cert),
+                                              maxdnlen);
+            if (!strIsEmpty(name)) {
+                BIO_puts(bio, name);
+            } else {
+                BIO_puts(bio, "-empty-");
+            }
+
+            BIO_puts(bio, " / issuer: ");
+            name = modssl_X509_NAME_to_string(p, X509_get_issuer_name(cert),
+                                              maxdnlen);
+            if (!strIsEmpty(name)) {
+                BIO_puts(bio, name);
+            } else {
+                BIO_puts(bio, "-empty-");
+            }
+
+            BIO_puts(bio, " / serial: ");
+            if (i2a_ASN1_INTEGER(bio, X509_get_serialNumber(cert)) == -1)
+                BIO_puts(bio, "(ERROR)");
+
+            BIO_puts(bio, " / notbefore: ");
+            ASN1_TIME_print(bio, X509_get_notBefore(cert));
+
+            BIO_puts(bio, " / notafter: ");
+            ASN1_TIME_print(bio, X509_get_notAfter(cert));
+
+            BIO_puts(bio, "]");
+
+            n = BIO_read(bio, buf + msglen, sizeof buf - msglen - 1);
+            if (n > 0)
+               buf[msglen + n] = '\0';
+
+            BIO_free(bio);
+        }
+    }
+    else {
+        apr_snprintf(buf + msglen, sizeof buf - msglen,
+                     " [certificate: -not available-]");
+    }
+
+    if (r) {
+        ap_log_rerror(file, line, APLOG_MODULE_INDEX, level, rv, r, "%s", buf);
+    }
+    else if (c) {
+        ap_log_cerror(file, line, APLOG_MODULE_INDEX, level, rv, c, "%s", buf);
+    }
+    else if (s) {
+        ap_log_error(file, line, APLOG_MODULE_INDEX, level, rv, s, "%s", buf);
+    }
+
+}
+
+/*
+ * Wrappers for ap_log_error/ap_log_cerror/ap_log_rerror which log additional
+ * details of the X509 cert. For ssl_log_xerror, a pool needs to be passed in
+ * as well (for temporary allocation of the cert's subject/issuer name strings,
+ * in the other cases we use the connection and request pool, respectively).
+ */
+void ssl_log_xerror(const char *file, int line, int level, apr_status_t rv,
+                    apr_pool_t *ptemp, server_rec *s, X509 *cert,
+                    const char *fmt, ...)
+{
+    if (APLOG_IS_LEVEL(s,level)) {
+       va_list ap;
+       va_start(ap, fmt);
+       ssl_log_cert_error(file, line, level, rv, s, NULL, NULL, ptemp,
+                          cert, fmt, ap);
+       va_end(ap);
+    }
+}
+
+void ssl_log_cxerror(const char *file, int line, int level, apr_status_t rv,
+                     conn_rec *c, X509 *cert, const char *fmt, ...)
+{
+    if (APLOG_IS_LEVEL(mySrvFromConn(c),level)) {
+       va_list ap;
+       va_start(ap, fmt);
+       ssl_log_cert_error(file, line, level, rv, NULL, c, NULL, c->pool,
+                          cert, fmt, ap);
+       va_end(ap);
+    }
+}
+
+void ssl_log_rxerror(const char *file, int line, int level, apr_status_t rv,
+                     request_rec *r, X509 *cert, const char *fmt, ...)
+{
+    if (APLOG_R_IS_LEVEL(r,level)) {
+       va_list ap;
+       va_start(ap, fmt);
+       ssl_log_cert_error(file, line, level, rv, NULL, NULL, r, r->pool,
+                          cert, fmt, ap);
+       va_end(ap);
+    }
+}
diff --git a/modules/ssl/ssl_engine_mutex.c b/modules/ssl/ssl_engine_mutex.c
new file mode 100644
index 0000000..e915a16
--- /dev/null
+++ b/modules/ssl/ssl_engine_mutex.c
@@ -0,0 +1,111 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_mutex.c
+ *  Semaphore for Mutual Exclusion
+ */
+                             /* ``Real programmers confuse
+                                  Christmas and Halloween
+                                  because DEC 25 = OCT 31.''
+                                             -- Unknown     */
+
+#include "ssl_private.h"
+
+int ssl_mutex_init(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+
+    /* A mutex is only needed if a session cache is configured, and
+     * the provider used is not internally multi-process/thread
+     * safe. */
+    if (!mc->sesscache
+        || (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) == 0) {
+        return TRUE;
+    }
+
+    if (mc->pMutex) {
+        return TRUE;
+    }
+
+    if ((rv = ap_global_mutex_create(&mc->pMutex, NULL, SSL_CACHE_MUTEX_TYPE,
+                                     NULL, s, s->process->pool, 0))
+            != APR_SUCCESS) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+int ssl_mutex_reinit(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+    const char *lockfile;
+
+    if (mc->pMutex == NULL || !mc->sesscache
+        || (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) == 0) {
+        return TRUE;
+    }
+
+    lockfile = apr_global_mutex_lockfile(mc->pMutex);
+    if ((rv = apr_global_mutex_child_init(&mc->pMutex,
+                                          lockfile,
+                                          p)) != APR_SUCCESS) {
+        if (lockfile)
+            ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(02024)
+                         "Cannot reinit %s mutex with file `%s'",
+                         SSL_CACHE_MUTEX_TYPE, lockfile);
+        else
+            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02025)
+                         "Cannot reinit %s mutex", SSL_CACHE_MUTEX_TYPE);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+int ssl_mutex_on(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+
+    if ((rv = apr_global_mutex_lock(mc->pMutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02026)
+                     "Failed to acquire SSL session cache lock");
+        return FALSE;
+    }
+    return TRUE;
+}
+
+int ssl_mutex_off(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+
+    if ((rv = apr_global_mutex_unlock(mc->pMutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(02027)
+                     "Failed to release SSL session cache lock");
+        return FALSE;
+    }
+    return TRUE;
+}
+
diff --git a/modules/ssl/ssl_engine_ocsp.c b/modules/ssl/ssl_engine_ocsp.c
new file mode 100644
index 0000000..5e04512
--- /dev/null
+++ b/modules/ssl/ssl_engine_ocsp.c
@@ -0,0 +1,312 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ssl_private.h"
+
+#ifndef OPENSSL_NO_OCSP
+#include "apr_base64.h"
+
+/* Return the responder URI specified in the given certificate, or
+ * NULL if none specified. */
+static const char *extract_responder_uri(X509 *cert, apr_pool_t *pool)
+{
+    STACK_OF(ACCESS_DESCRIPTION) *values;
+    char *result = NULL;
+    int j;
+
+    values = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
+    if (!values) {
+        return NULL;
+    }
+
+    for (j = 0; j < sk_ACCESS_DESCRIPTION_num(values) && !result; j++) {
+        ACCESS_DESCRIPTION *value = sk_ACCESS_DESCRIPTION_value(values, j);
+
+        /* Name found in extension, and is a URI: */
+        if (OBJ_obj2nid(value->method) == NID_ad_OCSP
+            && value->location->type == GEN_URI) {
+            result = apr_pstrdup(pool,
+                                 (char *)value->location->d.uniformResourceIdentifier->data);
+        }
+    }
+
+    AUTHORITY_INFO_ACCESS_free(values);
+
+    return result;
+}
+
+/* Return the responder URI object which should be used in the given
+ * configuration for the given certificate, or NULL if none can be
+ * determined. */
+static apr_uri_t *determine_responder_uri(SSLSrvConfigRec *sc, X509 *cert,
+                                          conn_rec *c, apr_pool_t *p)
+{
+    apr_uri_t *u = apr_palloc(p, sizeof *u);
+    const char *s;
+    apr_status_t rv;
+
+    /* Use default responder URL if forced by configuration, else use
+     * certificate-specified responder, falling back to default if
+     * necessary and possible. */
+    if (sc->server->ocsp_force_default == TRUE) {
+        s = sc->server->ocsp_responder;
+    }
+    else {
+        s = extract_responder_uri(cert, p);
+
+        if (s == NULL && sc->server->ocsp_responder) {
+            s = sc->server->ocsp_responder;
+        }
+    }
+
+    if (s == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01918)
+                      "no OCSP responder specified in certificate and "
+                      "no default configured");
+        return NULL;
+    }
+
+    rv = apr_uri_parse(p, s, u);
+    if (rv || !u->hostname) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(01919)
+                      "failed to parse OCSP responder URI '%s'", s);
+        return NULL;
+    }
+
+    if (ap_cstr_casecmp(u->scheme, "http") != 0) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(01920)
+                      "cannot handle OCSP responder URI '%s'", s);
+        return NULL;
+    }
+
+    if (!u->port) {
+        u->port = apr_uri_port_of_scheme(u->scheme);
+    }
+
+    return u;
+}
+
+/* Create an OCSP request for the given certificate; returning the
+ * certificate ID in *certid and *issuer on success.  Returns the
+ * request object on success, or NULL on error. */
+static OCSP_REQUEST *create_request(X509_STORE_CTX *ctx, X509 *cert,
+                                    OCSP_CERTID **certid,
+                                    server_rec *s, apr_pool_t *p,
+                                    SSLSrvConfigRec *sc)
+{
+    OCSP_REQUEST *req = OCSP_REQUEST_new();
+
+    *certid = OCSP_cert_to_id(NULL, cert, X509_STORE_CTX_get0_current_issuer(ctx));
+    if (!*certid || !OCSP_request_add0_id(req, *certid)) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01921)
+                     "could not retrieve certificate id");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+        return NULL;
+    }
+
+    if (sc->server->ocsp_use_request_nonce != FALSE) {
+        OCSP_request_add1_nonce(req, 0, -1);
+    }
+
+    return req;
+}
+
+/* Verify the OCSP status of given certificate.  Returns
+ * V_OCSP_CERTSTATUS_* result code. */
+static int verify_ocsp_status(X509 *cert, X509_STORE_CTX *ctx, conn_rec *c,
+                              SSLSrvConfigRec *sc, server_rec *s,
+                              apr_pool_t *pool)
+{
+    int rc = V_OCSP_CERTSTATUS_GOOD;
+    OCSP_RESPONSE *response = NULL;
+    OCSP_BASICRESP *basicResponse = NULL;
+    OCSP_REQUEST *request = NULL;
+    OCSP_CERTID *certID = NULL;
+    apr_uri_t *ruri;
+
+    ruri = determine_responder_uri(sc, cert, c, pool);
+    if (!ruri) {
+        if (sc->server->ocsp_mask & SSL_OCSPCHECK_NO_OCSP_FOR_CERT_OK) {
+            ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c, 
+                          "Skipping OCSP check for certificate cos no OCSP URL"
+                          " found and no_ocsp_for_cert_ok is set");
+            return V_OCSP_CERTSTATUS_GOOD;
+        } else {
+            return V_OCSP_CERTSTATUS_UNKNOWN;
+        }
+    }
+
+    request = create_request(ctx, cert, &certID, s, pool, sc);
+    if (request) {
+        apr_interval_time_t to = sc->server->ocsp_responder_timeout == UNSET ?
+                                 apr_time_from_sec(DEFAULT_OCSP_TIMEOUT) :
+                                 sc->server->ocsp_responder_timeout;
+        response = modssl_dispatch_ocsp_request(ruri, to, request, c, pool);
+    }
+
+    if (!request || !response) {
+        rc = V_OCSP_CERTSTATUS_UNKNOWN;
+    }
+
+    if (rc == V_OCSP_CERTSTATUS_GOOD) {
+        int r = OCSP_response_status(response);
+
+        if (r != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01922)
+                         "OCSP response not successful: %d", r);
+            rc = V_OCSP_CERTSTATUS_UNKNOWN;
+        }
+    }
+
+    if (rc == V_OCSP_CERTSTATUS_GOOD) {
+        basicResponse = OCSP_response_get1_basic(response);
+        if (!basicResponse) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01923)
+                          "could not retrieve OCSP basic response");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+            rc = V_OCSP_CERTSTATUS_UNKNOWN;
+        }
+    }
+
+    if (rc == V_OCSP_CERTSTATUS_GOOD &&
+            sc->server->ocsp_use_request_nonce != FALSE &&
+            OCSP_check_nonce(request, basicResponse) != 1) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01924)
+                    "Bad OCSP responder answer (bad nonce)");
+        rc = V_OCSP_CERTSTATUS_UNKNOWN;
+    }
+
+    if (rc == V_OCSP_CERTSTATUS_GOOD) {
+        /* Check if OCSP certificate verification required */
+        if (sc->server->ocsp_noverify != TRUE) {
+            /* Modify OCSP response verification to include OCSP Responder cert */
+            if (OCSP_basic_verify(basicResponse, sc->server->ocsp_certs, X509_STORE_CTX_get0_store(ctx),
+                                  sc->server->ocsp_verify_flags) != 1) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01925)
+                            "failed to verify the OCSP response");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+                rc = V_OCSP_CERTSTATUS_UNKNOWN;
+            }
+        }
+    }
+
+    if (rc == V_OCSP_CERTSTATUS_GOOD) {
+        int reason = -1, status;
+        ASN1_GENERALIZEDTIME *thisup = NULL, *nextup = NULL;
+
+        rc = OCSP_resp_find_status(basicResponse, certID, &status,
+                                   &reason, NULL, &thisup, &nextup);
+        if (rc != 1) {
+            ssl_log_cxerror(SSLLOG_MARK, APLOG_ERR, 0, c, cert, APLOGNO(02272)
+                            "failed to retrieve OCSP response status");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+            rc = V_OCSP_CERTSTATUS_UNKNOWN;
+        }
+        else {
+            rc = status;
+        }
+
+        /* Check whether the response is inside the defined validity
+         * period; otherwise fail.  */
+        if (rc != V_OCSP_CERTSTATUS_UNKNOWN) {
+            long resptime_skew = sc->server->ocsp_resptime_skew == UNSET ?
+                                 DEFAULT_OCSP_MAX_SKEW : sc->server->ocsp_resptime_skew;
+            /* oscp_resp_maxage can be passed verbatim - UNSET (-1) means
+             * that responses can be of any age as long as nextup is in the
+             * future. */
+            int vrc  = OCSP_check_validity(thisup, nextup, resptime_skew,
+                                           sc->server->ocsp_resp_maxage);
+            if (vrc != 1) {
+                ssl_log_cxerror(SSLLOG_MARK, APLOG_ERR, 0, c, cert, APLOGNO(02273)
+                                "OCSP response outside validity period");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+                rc = V_OCSP_CERTSTATUS_UNKNOWN;
+            }
+        }
+
+        {
+            int level =
+                (status == V_OCSP_CERTSTATUS_GOOD) ? APLOG_INFO : APLOG_ERR;
+            const char *result =
+                status == V_OCSP_CERTSTATUS_GOOD ? "good" :
+                (status == V_OCSP_CERTSTATUS_REVOKED ? "revoked" : "unknown");
+
+            ssl_log_cxerror(SSLLOG_MARK, level, 0, c, cert, APLOGNO(03239)
+                            "OCSP validation completed, "
+                            "certificate status: %s (%d, %d)",
+                            result, status, reason);
+        }
+    }
+
+    if (request) OCSP_REQUEST_free(request);
+    if (response) OCSP_RESPONSE_free(response);
+    if (basicResponse) OCSP_BASICRESP_free(basicResponse);
+    /* certID is freed when the request is freed */
+
+    return rc;
+}
+
+int modssl_verify_ocsp(X509_STORE_CTX *ctx, SSLSrvConfigRec *sc,
+                       server_rec *s, conn_rec *c, apr_pool_t *pool)
+{
+    X509 *cert = X509_STORE_CTX_get_current_cert(ctx);
+    apr_pool_t *vpool;
+    int rv;
+
+    if (!cert) {
+        /* starting with OpenSSL 1.0, X509_STORE_CTX_get_current_cert()
+         * may yield NULL. Return early, but leave the ctx error as is. */
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
+                      "No cert available to check with OCSP");
+        return 1;
+    }
+    else if (X509_check_issued(cert,cert) == X509_V_OK) {
+        /* don't do OCSP checking for valid self-issued certs */
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
+                      "Skipping OCSP check for valid self-issued cert");
+        X509_STORE_CTX_set_error(ctx, X509_V_OK);
+        return 1;
+    }
+
+    /* Create a temporary pool to constrain memory use (the passed-in
+     * pool may be e.g. a connection pool). */
+    apr_pool_create(&vpool, pool);
+    apr_pool_tag(vpool, "modssl_verify_ocsp");
+
+    rv = verify_ocsp_status(cert, ctx, c, sc, s, vpool);
+
+    apr_pool_destroy(vpool);
+
+    /* Propagate the verification status back to the passed-in
+     * context. */
+    switch (rv) {
+    case V_OCSP_CERTSTATUS_GOOD:
+        X509_STORE_CTX_set_error(ctx, X509_V_OK);
+        break;
+
+    case V_OCSP_CERTSTATUS_REVOKED:
+        X509_STORE_CTX_set_error(ctx, X509_V_ERR_CERT_REVOKED);
+        break;
+
+    case V_OCSP_CERTSTATUS_UNKNOWN:
+        /* correct error code for application errors? */
+        X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
+        break;
+    }
+
+    return rv == V_OCSP_CERTSTATUS_GOOD;
+}
+#endif /* HAVE_OCSP */
diff --git a/modules/ssl/ssl_engine_pphrase.c b/modules/ssl/ssl_engine_pphrase.c
new file mode 100644
index 0000000..d1859f7
--- /dev/null
+++ b/modules/ssl/ssl_engine_pphrase.c
@@ -0,0 +1,911 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_pphrase.c
+ *  Pass Phrase Dialog
+ */
+                             /* ``Treat your password like your
+                                  toothbrush. Don't let anybody
+                                  else use it, and get a new one
+                                  every six months.''
+                                           -- Clifford Stoll     */
+#include "ssl_private.h"
+
+typedef struct {
+    server_rec         *s;
+    apr_pool_t         *p;
+    apr_array_header_t *aPassPhrase;
+    int                 nPassPhraseCur;
+    char               *cpPassPhraseCur;
+    int                 nPassPhraseDialog;
+    int                 nPassPhraseDialogCur;
+    BOOL                bPassPhraseDialogOnce;
+    const char         *key_id;
+    const char         *pkey_file;
+} pphrase_cb_arg_t;
+
+#ifdef HAVE_ECC
+static const char *key_types[] = {"RSA", "DSA", "ECC"};
+#else
+static const char *key_types[] = {"RSA", "DSA"};
+#endif
+
+/*
+ * Return true if the named file exists and is readable
+ */
+
+static apr_status_t exists_and_readable(const char *fname, apr_pool_t *pool,
+                                        apr_time_t *mtime)
+{
+    apr_status_t stat;
+    apr_finfo_t sbuf;
+    apr_file_t *fd;
+
+    if ((stat = apr_stat(&sbuf, fname, APR_FINFO_MIN, pool)) != APR_SUCCESS)
+        return stat;
+
+    if (sbuf.filetype != APR_REG)
+        return APR_EGENERAL;
+
+    if ((stat = apr_file_open(&fd, fname, APR_READ, 0, pool)) != APR_SUCCESS)
+        return stat;
+
+    if (mtime) {
+        *mtime = sbuf.mtime;
+    }
+
+    apr_file_close(fd);
+    return APR_SUCCESS;
+}
+
+/*
+ * reuse vhost keys for asn1 tables where keys are allocated out
+ * of s->process->pool to prevent "leaking" each time we format
+ * a vhost key.  since the key is stored in a table with lifetime
+ * of s->process->pool, the key needs to have the same lifetime.
+ *
+ * XXX: probably seems silly to use a hash table with keys and values
+ * being the same, but it is easier than doing a linear search
+ * and will make it easier to remove keys if needed in the future.
+ * also have the problem with apr_array_header_t that if we
+ * underestimate the number of vhost keys when we apr_array_make(),
+ * the array will get resized when we push past the initial number
+ * of elts.  this resizing in the s->process->pool means "leaking"
+ * since apr_array_push() will apr_alloc arr->nalloc * 2 elts,
+ * leaving the original arr->elts to waste.
+ */
+static const char *asn1_table_vhost_key(SSLModConfigRec *mc, apr_pool_t *p,
+                                  const char *id, int i)
+{
+    /* 'p' pool used here is cleared on restarts (or sooner) */
+    char *key = apr_psprintf(p, "%s:%d", id, i);
+    void *keyptr = apr_hash_get(mc->tVHostKeys, key,
+                                APR_HASH_KEY_STRING);
+
+    if (!keyptr) {
+        /* make a copy out of s->process->pool */
+        keyptr = apr_pstrdup(mc->pPool, key);
+        apr_hash_set(mc->tVHostKeys, keyptr,
+                     APR_HASH_KEY_STRING, keyptr);
+    }
+
+    return (char *)keyptr;
+}
+
+/*  _________________________________________________________________
+**
+**  Pass Phrase and Private Key Handling
+**  _________________________________________________________________
+*/
+
+#define BUILTIN_DIALOG_BACKOFF 2
+#define BUILTIN_DIALOG_RETRIES 5
+
+static apr_file_t *writetty = NULL;
+static apr_file_t *readtty = NULL;
+
+int ssl_pphrase_Handle_CB(char *, int, int, void *);
+
+static char *pphrase_array_get(apr_array_header_t *arr, int idx)
+{
+    if ((idx < 0) || (idx >= arr->nelts)) {
+        return NULL;
+    }
+
+    return ((char **)arr->elts)[idx];
+}
+
+apr_status_t ssl_load_encrypted_pkey(server_rec *s, apr_pool_t *p, int idx,
+                                     const char *pkey_file,
+                                     apr_array_header_t **pphrases)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    const char *key_id = asn1_table_vhost_key(mc, p, sc->vhost_id, idx);
+    EVP_PKEY *pPrivateKey = NULL;
+    ssl_asn1_t *asn1;
+    int nPassPhrase = (*pphrases)->nelts;
+    int nPassPhraseRetry = 0;
+    apr_time_t pkey_mtime = 0;
+    apr_status_t rv;
+    pphrase_cb_arg_t ppcb_arg;
+
+    if (!pkey_file) {
+         ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02573)
+                      "Init: No private key specified for %s", key_id);
+         return ssl_die(s);
+    }
+    else if ((rv = exists_and_readable(pkey_file, p, &pkey_mtime))
+             != APR_SUCCESS ) {
+         ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(02574)
+                      "Init: Can't open server private key file %s", pkey_file);
+         return ssl_die(s);
+    }
+
+    ppcb_arg.s                     = s;
+    ppcb_arg.p                     = p;
+    ppcb_arg.aPassPhrase           = *pphrases;
+    ppcb_arg.nPassPhraseCur        = 0;
+    ppcb_arg.cpPassPhraseCur       = NULL;
+    ppcb_arg.nPassPhraseDialog     = 0;
+    ppcb_arg.nPassPhraseDialogCur  = 0;
+    ppcb_arg.bPassPhraseDialogOnce = TRUE;
+    ppcb_arg.key_id                = key_id;
+    ppcb_arg.pkey_file             = pkey_file;
+
+    /*
+     * if the private key is encrypted and SSLPassPhraseDialog
+     * is configured to "builtin" it isn't possible to prompt for
+     * a password after httpd has detached from the tty.
+     * in this case if we already have a private key and the
+     * file name/mtime hasn't changed, then reuse the existing key.
+     * we also reuse existing private keys that were encrypted for
+     * exec: and pipe: dialogs to minimize chances to snoop the
+     * password.  that and pipe: dialogs might prompt the user
+     * for password, which on win32 for example could happen 4
+     * times at startup.  twice for each child and twice within
+     * each since apache "restarts itself" on startup.
+     * of course this will not work for the builtin dialog if
+     * the server was started without LoadModule ssl_module
+     * configured, then restarted with it configured.
+     * but we fall through with a chance of success if the key
+     * is not encrypted or can be handled via exec or pipe dialog.
+     * and in the case of fallthrough, pkey_mtime and isatty()
+     * are used to give a better idea as to what failed.
+     */
+    if (pkey_mtime) {
+        ssl_asn1_t *asn1 = ssl_asn1_table_get(mc->tPrivateKey, key_id);
+        if (asn1 && (asn1->source_mtime == pkey_mtime)) {
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02575)
+                         "Reusing existing private key from %s on restart",
+                         ppcb_arg.pkey_file);
+            return APR_SUCCESS;
+        }
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(02576)
+                 "Attempting to load encrypted (?) private key %s", key_id);
+
+    for (;;) {
+        /*
+         * Try to read the private key file with the help of
+         * the callback function which serves the pass
+         * phrases to OpenSSL
+         */
+
+        ppcb_arg.cpPassPhraseCur = NULL;
+
+        /* Ensure that the error stack is empty; some SSL
+         * functions will fail spuriously if the error stack
+         * is not empty. */
+        ERR_clear_error();
+
+        pPrivateKey = modssl_read_privatekey(ppcb_arg.pkey_file,
+                                             ssl_pphrase_Handle_CB, &ppcb_arg);
+        /* If the private key was successfully read, nothing more to
+           do here. */
+        if (pPrivateKey != NULL)
+            break;
+
+        /*
+         * when we have more remembered pass phrases
+         * try to reuse these first.
+         */
+        if (ppcb_arg.nPassPhraseCur < nPassPhrase) {
+            ppcb_arg.nPassPhraseCur++;
+            continue;
+        }
+
+        /*
+         * else it's not readable and we have no more
+         * remembered pass phrases. Then this has to mean
+         * that the callback function popped up the dialog
+         * but a wrong pass phrase was entered.  We give the
+         * user (but not the dialog program) a few more
+         * chances...
+         */
+#ifndef WIN32
+        if ((sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN
+             || sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE)
+#else
+        if (sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE
+#endif
+            && ppcb_arg.cpPassPhraseCur != NULL
+            && nPassPhraseRetry < BUILTIN_DIALOG_RETRIES ) {
+            apr_file_printf(writetty, "Apache:mod_ssl:Error: Pass phrase incorrect "
+                    "(%d more retr%s permitted).\n",
+                    (BUILTIN_DIALOG_RETRIES-nPassPhraseRetry),
+                    (BUILTIN_DIALOG_RETRIES-nPassPhraseRetry) == 1 ? "y" : "ies");
+            nPassPhraseRetry++;
+            if (nPassPhraseRetry > BUILTIN_DIALOG_BACKOFF)
+                apr_sleep((nPassPhraseRetry-BUILTIN_DIALOG_BACKOFF)
+                            * 5 * APR_USEC_PER_SEC);
+            continue;
+        }
+#ifdef WIN32
+        if (sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02577)
+                         "Init: SSLPassPhraseDialog builtin is not "
+                         "supported on Win32 (key file "
+                         "%s)", ppcb_arg.pkey_file);
+            return ssl_die(s);
+        }
+#endif /* WIN32 */
+
+        /*
+         * Ok, anything else now means a fatal error.
+         */
+        if (ppcb_arg.cpPassPhraseCur == NULL) {
+            if (ppcb_arg.nPassPhraseDialogCur && pkey_mtime &&
+                !isatty(fileno(stdout))) /* XXX: apr_isatty() */
+            {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                             s, APLOGNO(02578)
+                             "Init: Unable to read pass phrase "
+                             "[Hint: key introduced or changed "
+                             "before restart?]");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                             s, APLOGNO(02579) "Init: Private key not found");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+            }
+            if (writetty) {
+                apr_file_printf(writetty, "Apache:mod_ssl:Error: Private key not found.\n");
+                apr_file_printf(writetty, "**Stopped\n");
+            }
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02580)
+                         "Init: Pass phrase incorrect for key %s",
+                         key_id);
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+
+            if (writetty) {
+                apr_file_printf(writetty, "Apache:mod_ssl:Error: Pass phrase incorrect.\n");
+                apr_file_printf(writetty, "**Stopped\n");
+            }
+        }
+        return ssl_die(s);
+    }
+
+    if (pPrivateKey == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(02581)
+                     "Init: Unable to read server private key from file %s",
+                     ppcb_arg.pkey_file);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    /*
+     * Log the type of reading
+     */
+    if (ppcb_arg.nPassPhraseDialogCur == 0) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02582)
+                     "unencrypted %s private key - pass phrase not "
+                     "required", key_id);
+    }
+    else {
+        if (ppcb_arg.cpPassPhraseCur != NULL) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
+                         s, APLOGNO(02583)
+                         "encrypted %s private key - pass phrase "
+                         "requested", key_id);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0,
+                         s, APLOGNO(02584)
+                         "encrypted %s private key - pass phrase"
+                         " reused", key_id);
+        }
+    }
+
+    /*
+     * Ok, when we have one more pass phrase store it
+     */
+    if (ppcb_arg.cpPassPhraseCur != NULL) {
+        *(const char **)apr_array_push(ppcb_arg.aPassPhrase) =
+            ppcb_arg.cpPassPhraseCur;
+        nPassPhrase++;
+    }
+
+    /* Cache the private key in the global module configuration so it
+     * can be used after subsequent reloads. */
+    asn1 = ssl_asn1_table_set(mc->tPrivateKey, key_id, pPrivateKey);
+
+    if (ppcb_arg.nPassPhraseDialogCur != 0) {
+        /* remember mtime of encrypted keys */
+        asn1->source_mtime = pkey_mtime;
+    }
+
+    /*
+     * Free the private key structure
+     */
+    EVP_PKEY_free(pPrivateKey);
+
+    /*
+     * Let the user know when we're successful.
+     */
+    if ((ppcb_arg.nPassPhraseDialog > 0) &&
+        (ppcb_arg.cpPassPhraseCur != NULL)) {
+        if (writetty) {
+            apr_file_printf(writetty, "\n"
+                            "OK: Pass Phrase Dialog successful.\n");
+        }
+    }
+
+    /* Close the pipes if they were opened
+     */
+    if (readtty) {
+        apr_file_close(readtty);
+        apr_file_close(writetty);
+        readtty = writetty = NULL;
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t ssl_pipe_child_create(apr_pool_t *p, const char *progname)
+{
+    /* Child process code for 'ErrorLog "|..."';
+     * may want a common framework for this, since I expect it will
+     * be common for other foo-loggers to want this sort of thing...
+     */
+    apr_status_t rc;
+    apr_procattr_t *procattr;
+    apr_proc_t *procnew;
+
+    if (((rc = apr_procattr_create(&procattr, p)) == APR_SUCCESS) &&
+        ((rc = apr_procattr_io_set(procattr,
+                                   APR_FULL_BLOCK,
+                                   APR_FULL_BLOCK,
+                                   APR_NO_PIPE)) == APR_SUCCESS)) {
+        char **args;
+
+        apr_tokenize_to_argv(progname, &args, p);
+        procnew = (apr_proc_t *)apr_pcalloc(p, sizeof(*procnew));
+        rc = apr_proc_create(procnew, args[0], (const char * const *)args,
+                             NULL, procattr, p);
+        if (rc == APR_SUCCESS) {
+            /* XXX: not sure if we aught to...
+             * apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
+             */
+            writetty = procnew->in;
+            readtty = procnew->out;
+        }
+    }
+
+    return rc;
+}
+
+static int pipe_get_passwd_cb(char *buf, int length, char *prompt, int verify)
+{
+    apr_status_t rc;
+    char *p;
+
+    apr_file_puts(prompt, writetty);
+
+    buf[0]='\0';
+    rc = apr_file_gets(buf, length, readtty);
+    apr_file_puts(APR_EOL_STR, writetty);
+
+    if (rc != APR_SUCCESS || apr_file_eof(readtty)) {
+        memset(buf, 0, length);
+        return 1;  /* failure */
+    }
+    if ((p = strchr(buf, '\n')) != NULL) {
+        *p = '\0';
+    }
+#ifdef WIN32
+    /* XXX: apr_sometest */
+    if ((p = strchr(buf, '\r')) != NULL) {
+        *p = '\0';
+    }
+#endif
+    return 0;
+}
+
+int ssl_pphrase_Handle_CB(char *buf, int bufsize, int verify, void *srv)
+{
+    pphrase_cb_arg_t *ppcb_arg = (pphrase_cb_arg_t *)srv;
+    SSLSrvConfigRec *sc = mySrvConfig(ppcb_arg->s);
+    char *cpp;
+    int len = -1;
+
+    ppcb_arg->nPassPhraseDialog++;
+    ppcb_arg->nPassPhraseDialogCur++;
+
+    /*
+     * When remembered pass phrases are available use them...
+     */
+    if ((cpp = pphrase_array_get(ppcb_arg->aPassPhrase,
+                                 ppcb_arg->nPassPhraseCur)) != NULL) {
+        apr_cpystrn(buf, cpp, bufsize);
+        len = strlen(buf);
+        return len;
+    }
+
+    /*
+     * Builtin or Pipe dialog
+     */
+    if (sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN
+          || sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+        char *prompt;
+        int i;
+
+        if (sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+            if (!readtty) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb_arg->s,
+                             APLOGNO(01965)
+                             "Init: Creating pass phrase dialog pipe child "
+                             "'%s'", sc->server->pphrase_dialog_path);
+                if (ssl_pipe_child_create(ppcb_arg->p,
+                                          sc->server->pphrase_dialog_path)
+                        != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, 0, ppcb_arg->s,
+                                 APLOGNO(01966)
+                                 "Init: Failed to create pass phrase pipe '%s'",
+                                 sc->server->pphrase_dialog_path);
+                    PEMerr(PEM_F_PEM_DEF_CALLBACK,
+                           PEM_R_PROBLEMS_GETTING_PASSWORD);
+                    memset(buf, 0, (unsigned int)bufsize);
+                    return (-1);
+                }
+            }
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb_arg->s, APLOGNO(01967)
+                         "Init: Requesting pass phrase via piped dialog");
+        }
+        else { /* sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN */
+#ifdef WIN32
+            PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
+            memset(buf, 0, (unsigned int)bufsize);
+            return (-1);
+#else
+            /*
+             * stderr has already been redirected to the error_log.
+             * rather than attempting to temporarily rehook it to the terminal,
+             * we print the prompt to stdout before EVP_read_pw_string turns
+             * off tty echo
+             */
+            apr_file_open_stdout(&writetty, ppcb_arg->p);
+
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb_arg->s, APLOGNO(01968)
+                         "Init: Requesting pass phrase via builtin terminal "
+                         "dialog");
+#endif
+        }
+
+        /*
+         * The first time display a header to inform the user about what
+         * program he actually speaks to, which module is responsible for
+         * this terminal dialog and why to the hell he has to enter
+         * something...
+         */
+        if (ppcb_arg->nPassPhraseDialog == 1) {
+            apr_file_printf(writetty, "%s mod_ssl (Pass Phrase Dialog)\n",
+                            AP_SERVER_BASEVERSION);
+            apr_file_printf(writetty, "Some of your private key files are encrypted for security reasons.\n");
+            apr_file_printf(writetty, "In order to read them you have to provide the pass phrases.\n");
+        }
+        if (ppcb_arg->bPassPhraseDialogOnce) {
+            ppcb_arg->bPassPhraseDialogOnce = FALSE;
+            apr_file_printf(writetty, "\n");
+            apr_file_printf(writetty, "Private key %s (%s)\n",
+                            ppcb_arg->key_id, ppcb_arg->pkey_file);
+        }
+
+        /*
+         * Emulate the OpenSSL internal pass phrase dialog
+         * (see crypto/pem/pem_lib.c:def_callback() for details)
+         */
+        prompt = "Enter pass phrase:";
+
+        for (;;) {
+            apr_file_puts(prompt, writetty);
+            if (sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+                i = pipe_get_passwd_cb(buf, bufsize, "", FALSE);
+            }
+            else { /* sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN */
+                i = EVP_read_pw_string(buf, bufsize, "", FALSE);
+            }
+            if (i != 0) {
+                PEMerr(PEM_F_PEM_DEF_CALLBACK,PEM_R_PROBLEMS_GETTING_PASSWORD);
+                memset(buf, 0, (unsigned int)bufsize);
+                return (-1);
+            }
+            len = strlen(buf);
+            if (len < 1)
+                apr_file_printf(writetty, "Apache:mod_ssl:Error: Pass phrase empty (needs to be at least 1 character).\n");
+            else
+                break;
+        }
+    }
+
+    /*
+     * Filter program
+     */
+    else if (sc->server->pphrase_dialog_type == SSL_PPTYPE_FILTER) {
+        const char *cmd = sc->server->pphrase_dialog_path;
+        const char **argv = apr_palloc(ppcb_arg->p, sizeof(char *) * 4);
+        const char *idx = ap_strrchr_c(ppcb_arg->key_id, ':') + 1;
+        char *result;
+        int i;
+
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb_arg->s, APLOGNO(01969)
+                     "Init: Requesting pass phrase from dialog filter "
+                     "program (%s)", cmd);
+
+        argv[0] = cmd;
+        argv[1] = apr_pstrndup(ppcb_arg->p, ppcb_arg->key_id,
+                               idx-1 - ppcb_arg->key_id);
+        if ((i = atoi(idx)) < CERTKEYS_IDX_MAX+1) {
+            /*
+             * For compatibility with existing 2.4.x configurations, use
+             * "RSA", "DSA" and "ECC" strings for the first two/three keys
+             */
+            argv[2] = key_types[i];
+        } else {
+            /* Four and above: use the integer index */
+            argv[2] = apr_pstrdup(ppcb_arg->p, idx);
+        }
+        argv[3] = NULL;
+
+        result = ssl_util_readfilter(ppcb_arg->s, ppcb_arg->p, cmd, argv);
+        apr_cpystrn(buf, result, bufsize);
+        len = strlen(buf);
+    }
+
+    /*
+     * Ok, we now have the pass phrase, so give it back
+     */
+    ppcb_arg->cpPassPhraseCur = apr_pstrdup(ppcb_arg->p, buf);
+
+    /*
+     * And return its length to OpenSSL...
+     */
+    return (len);
+}
+
+
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+
+/* OpenSSL UI implementation for passphrase entry; largely duplicated
+ * from ssl_pphrase_Handle_CB but adjusted for UI API. TODO: Might be
+ * worth trying to shift pphrase handling over to the UI API
+ * completely. */
+static int passphrase_ui_open(UI *ui)
+{
+    pphrase_cb_arg_t *ppcb = UI_get0_user_data(ui);
+    SSLSrvConfigRec *sc = mySrvConfig(ppcb->s);
+
+    ppcb->nPassPhraseDialog++;
+    ppcb->nPassPhraseDialogCur++;
+
+    /*
+     * Builtin or Pipe dialog
+     */
+    if (sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN
+        || sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+        if (sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+            if (!readtty) {
+                ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb->s,
+                             APLOGNO(10143)
+                             "Init: Creating pass phrase dialog pipe child "
+                             "'%s'", sc->server->pphrase_dialog_path);
+                if (ssl_pipe_child_create(ppcb->p,
+                            sc->server->pphrase_dialog_path)
+                        != APR_SUCCESS) {
+                    ap_log_error(APLOG_MARK, APLOG_ERR, 0, ppcb->s,
+                                 APLOGNO(10144)
+                                 "Init: Failed to create pass phrase pipe '%s'",
+                                 sc->server->pphrase_dialog_path);
+                    return 0;
+                }
+            }
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb->s, APLOGNO(10145)
+                         "Init: Requesting pass phrase via piped dialog");
+        }
+        else { /* sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN */
+#ifdef WIN32
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, ppcb->s, APLOGNO(10146)
+                         "Init: Failed to create pass phrase pipe '%s'",
+                         sc->server->pphrase_dialog_path);
+            return 0;
+#else
+            /*
+             * stderr has already been redirected to the error_log.
+             * rather than attempting to temporarily rehook it to the terminal,
+             * we print the prompt to stdout before EVP_read_pw_string turns
+             * off tty echo
+             */
+            apr_file_open_stdout(&writetty, ppcb->p);
+
+            ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb->s, APLOGNO(10147)
+                         "Init: Requesting pass phrase via builtin terminal "
+                         "dialog");
+#endif
+        }
+
+        /*
+         * The first time display a header to inform the user about what
+         * program he actually speaks to, which module is responsible for
+         * this terminal dialog and why to the hell he has to enter
+         * something...
+         */
+        if (ppcb->nPassPhraseDialog == 1) {
+            apr_file_printf(writetty, "%s mod_ssl (Pass Phrase Dialog)\n",
+                            AP_SERVER_BASEVERSION);
+            apr_file_printf(writetty,
+                            "A pass phrase is required to access the private key.\n");
+        }
+        if (ppcb->bPassPhraseDialogOnce) {
+            ppcb->bPassPhraseDialogOnce = FALSE;
+            apr_file_printf(writetty, "\n");
+            apr_file_printf(writetty, "Private key %s (%s)\n",
+                            ppcb->key_id, ppcb->pkey_file);
+        }
+    }
+
+    return 1;
+}
+
+static int passphrase_ui_read(UI *ui, UI_STRING *uis)
+{
+    pphrase_cb_arg_t *ppcb = UI_get0_user_data(ui);
+    SSLSrvConfigRec *sc = mySrvConfig(ppcb->s);
+    const char *prompt;
+    int i;
+    int bufsize;
+    int len;
+    char *buf;
+
+    prompt = UI_get0_output_string(uis);
+    if (prompt == NULL) {
+        prompt = "Enter pass phrase:";
+    }
+
+    /*
+     * Get the maximum expected size and allocate the buffer
+     */
+    bufsize = UI_get_result_maxsize(uis);
+    buf = apr_pcalloc(ppcb->p, bufsize);
+
+    if (sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN
+        || sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+        /*
+         * Get the pass phrase through a callback.
+         * Empty input is not accepted.
+         */
+        for (;;) {
+            if (sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+                i = pipe_get_passwd_cb(buf, bufsize, "", FALSE);
+            }
+            else { /* sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN */
+                i = EVP_read_pw_string(buf, bufsize, "", FALSE);
+            }
+            if (i != 0) {
+                OPENSSL_cleanse(buf, bufsize);
+                return 0;
+            }
+            len = strlen(buf);
+            if (len < 1){
+                apr_file_printf(writetty, "Apache:mod_ssl:Error: Pass phrase"
+                                "empty (needs to be at least 1 character).\n");
+                apr_file_puts(prompt, writetty);
+            }
+            else {
+                break;
+            }
+        }
+    }
+    /*
+     * Filter program
+     */
+    else if (sc->server->pphrase_dialog_type == SSL_PPTYPE_FILTER) {
+        const char *cmd = sc->server->pphrase_dialog_path;
+        const char **argv = apr_palloc(ppcb->p, sizeof(char *) * 3);
+        char *result;
+
+        ap_log_error(APLOG_MARK, APLOG_INFO, 0, ppcb->s, APLOGNO(10148)
+                     "Init: Requesting pass phrase from dialog filter "
+                     "program (%s)", cmd);
+
+        argv[0] = cmd;
+        argv[1] = ppcb->key_id;
+        argv[2] = NULL;
+
+        result = ssl_util_readfilter(ppcb->s, ppcb->p, cmd, argv);
+        apr_cpystrn(buf, result, bufsize);
+        len = strlen(buf);
+    }
+
+    /*
+     * Ok, we now have the pass phrase, so give it back
+     */
+    ppcb->cpPassPhraseCur = apr_pstrdup(ppcb->p, buf);
+    UI_set_result(ui, uis, buf);
+
+    /* Clear sensitive data. */
+    OPENSSL_cleanse(buf, bufsize);
+    return 1;
+}
+
+static int passphrase_ui_write(UI *ui, UI_STRING *uis)
+{
+    pphrase_cb_arg_t *ppcb = UI_get0_user_data(ui);
+    SSLSrvConfigRec *sc;
+    const char *prompt;
+
+    sc = mySrvConfig(ppcb->s);
+
+    if (sc->server->pphrase_dialog_type == SSL_PPTYPE_BUILTIN
+        || sc->server->pphrase_dialog_type == SSL_PPTYPE_PIPE) {
+        prompt = UI_get0_output_string(uis);
+        apr_file_puts(prompt, writetty);
+    }
+
+    return 1;
+}
+
+static int passphrase_ui_close(UI *ui)
+{
+    /*
+     * Close the pipes if they were opened
+     */
+    if (readtty) {
+        apr_file_close(readtty);
+        apr_file_close(writetty);
+        readtty = writetty = NULL;
+    }
+    return 1;
+}
+
+static apr_status_t pp_ui_method_cleanup(void *uip)
+{
+    UI_METHOD *uim = uip;
+    
+    UI_destroy_method(uim);
+
+    return APR_SUCCESS;
+}
+
+static UI_METHOD *get_passphrase_ui(apr_pool_t *p)
+{
+    UI_METHOD *ui_method = UI_create_method("Passphrase UI");
+
+    UI_method_set_opener(ui_method, passphrase_ui_open);
+    UI_method_set_reader(ui_method, passphrase_ui_read);
+    UI_method_set_writer(ui_method, passphrase_ui_write);
+    UI_method_set_closer(ui_method, passphrase_ui_close);
+
+    apr_pool_cleanup_register(p, ui_method, pp_ui_method_cleanup,
+                              pp_ui_method_cleanup);
+    
+    return ui_method;
+}
+#endif
+
+
+apr_status_t modssl_load_engine_keypair(server_rec *s, apr_pool_t *p,
+                                        const char *vhostid,
+                                        const char *certid, const char *keyid,
+                                        X509 **pubkey, EVP_PKEY **privkey)
+{
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    const char *c, *scheme;
+    ENGINE *e;
+    UI_METHOD *ui_method = get_passphrase_ui(p);
+    pphrase_cb_arg_t ppcb;
+
+    memset(&ppcb, 0, sizeof ppcb);
+    ppcb.s = s;
+    ppcb.p = p;
+    ppcb.bPassPhraseDialogOnce = TRUE;
+    ppcb.key_id = vhostid;
+    ppcb.pkey_file = keyid;
+
+    c = ap_strchr_c(keyid, ':');
+    if (!c || c == keyid) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10131)
+                     "Init: Unrecognized private key identifier `%s'",
+                     keyid);
+        return ssl_die(s);
+    }
+
+    scheme = apr_pstrmemdup(p, keyid, c - keyid);
+    if (!(e = ENGINE_by_id(scheme))) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10132)
+                     "Init: Failed to load engine for private key %s",
+                     keyid);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    if (!ENGINE_init(e)) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10149)
+                     "Init: Failed to initialize engine %s for private key %s",
+                     scheme, keyid);
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, 
+                 "Init: Initialized engine %s for private key %s",
+                 scheme, keyid);
+
+    if (APLOGdebug(s)) {
+        ENGINE_ctrl_cmd_string(e, "VERBOSE", NULL, 0);
+    }
+
+    if (certid) {
+        struct {
+            const char *cert_id;
+            X509 *cert;
+        } params = { certid, NULL };
+
+        if (!ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &params, NULL, 1)) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10136)
+                         "Init: Unable to get the certificate");
+            ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+            return ssl_die(s);
+        }
+
+        *pubkey = params.cert;
+    }
+
+    *privkey = ENGINE_load_private_key(e, keyid, ui_method, &ppcb);
+    if (*privkey == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(10133)
+                     "Init: Unable to get the private key");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+        return ssl_die(s);
+    }
+
+    ENGINE_finish(e);
+    ENGINE_free(e);
+
+    return APR_SUCCESS;
+#else
+    return APR_ENOTIMPL;
+#endif
+}
diff --git a/modules/ssl/ssl_engine_rand.c b/modules/ssl/ssl_engine_rand.c
new file mode 100644
index 0000000..4e1a9c1
--- /dev/null
+++ b/modules/ssl/ssl_engine_rand.c
@@ -0,0 +1,177 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_rand.c
+ *  Random Number Generator Seeding
+ */
+                             /* ``The generation of random
+                                  numbers is too important
+                                  to be left to chance.'' */
+
+#include "ssl_private.h"
+
+/*  _________________________________________________________________
+**
+**  Support for better seeding of SSL library's RNG
+**  _________________________________________________________________
+*/
+
+static int ssl_rand_choosenum(int, int);
+static int ssl_rand_feedfp(apr_pool_t *, apr_file_t *, int);
+
+int ssl_rand_seed(server_rec *s, apr_pool_t *p, ssl_rsctx_t nCtx, char *prefix)
+{
+    SSLModConfigRec *mc;
+    apr_array_header_t *apRandSeed;
+    ssl_randseed_t *pRandSeeds;
+    ssl_randseed_t *pRandSeed;
+    unsigned char stackdata[256];
+    int nDone;
+    apr_file_t *fp;
+    int i, n, l;
+
+    mc = myModConfig(s);
+    nDone = 0;
+    apRandSeed = mc->aRandSeed;
+    pRandSeeds = (ssl_randseed_t *)apRandSeed->elts;
+    for (i = 0; i < apRandSeed->nelts; i++) {
+        pRandSeed = &pRandSeeds[i];
+        if (pRandSeed->nCtx == nCtx) {
+            if (pRandSeed->nSrc == SSL_RSSRC_FILE) {
+                /*
+                 * seed in contents of an external file
+                 */
+                if (apr_file_open(&fp, pRandSeed->cpPath,
+                                  APR_READ, APR_OS_DEFAULT, p) != APR_SUCCESS)
+                    continue;
+                nDone += ssl_rand_feedfp(p, fp, pRandSeed->nBytes);
+                apr_file_close(fp);
+            }
+            else if (pRandSeed->nSrc == SSL_RSSRC_EXEC) {
+                const char *cmd = pRandSeed->cpPath;
+                const char **argv = apr_palloc(p, sizeof(char *) * 3);
+                /*
+                 * seed in contents generated by an external program
+                 */
+                argv[0] = cmd;
+                argv[1] = apr_itoa(p, pRandSeed->nBytes);
+                argv[2] = NULL;
+
+                if ((fp = ssl_util_ppopen(s, p, cmd, argv)) == NULL)
+                    continue;
+                nDone += ssl_rand_feedfp(p, fp, pRandSeed->nBytes);
+                ssl_util_ppclose(s, p, fp);
+            }
+#ifdef HAVE_RAND_EGD
+            else if (pRandSeed->nSrc == SSL_RSSRC_EGD) {
+                /*
+                 * seed in contents provided by the external
+                 * Entropy Gathering Daemon (EGD)
+                 */
+                if ((n = RAND_egd(pRandSeed->cpPath)) == -1)
+                    continue;
+                nDone += n;
+            }
+#endif
+            else if (pRandSeed->nSrc == SSL_RSSRC_BUILTIN) {
+                struct {
+                    time_t t;
+                    pid_t pid;
+                } my_seed;
+
+                /*
+                 * seed in the current time (usually just 4 bytes)
+                 */
+                my_seed.t = time(NULL);
+
+                /*
+                 * seed in the current process id (usually just 4 bytes)
+                 */
+                my_seed.pid = mc->pid;
+
+                l = sizeof(my_seed);
+                RAND_seed((unsigned char *)&my_seed, l);
+                nDone += l;
+
+                /*
+                 * seed in some current state of the run-time stack (128 bytes)
+                 */
+                n = ssl_rand_choosenum(0, sizeof(stackdata)-128-1);
+                RAND_seed(stackdata+n, 128);
+                nDone += 128;
+
+            }
+        }
+    }
+    ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s,
+                 "%sSeeding PRNG with %d bytes of entropy", prefix, nDone);
+
+    if (RAND_status() == 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01990)
+                     "%sPRNG still contains insufficient entropy!", prefix);
+
+    return nDone;
+}
+
+#define BUFSIZE 8192
+
+static int ssl_rand_feedfp(apr_pool_t *p, apr_file_t *fp, int nReq)
+{
+    apr_size_t nDone;
+    unsigned char caBuf[BUFSIZE];
+    apr_size_t nBuf;
+    apr_size_t nRead;
+    apr_size_t nTodo;
+
+    nDone = 0;
+    nRead = BUFSIZE;
+    nTodo = nReq;
+    while (1) {
+        if (nReq > 0)
+            nRead = (nTodo < BUFSIZE ? nTodo : BUFSIZE);
+        nBuf = nRead;
+        if (apr_file_read(fp, caBuf, &nBuf) != APR_SUCCESS)
+            break;
+        RAND_seed(caBuf, nBuf);
+        nDone += nBuf;
+        if (nReq > 0) {
+            nTodo -= nBuf;
+            if (nTodo <= 0)
+                break;
+        }
+    }
+    return nDone;
+}
+
+static int ssl_rand_choosenum(int l, int h)
+{
+    int i;
+    char buf[50];
+
+    apr_snprintf(buf, sizeof(buf), "%.0f",
+                 (((double)(rand()%RAND_MAX)/RAND_MAX)*(h-l)));
+    i = atoi(buf)+1;
+    if (i < l) i = l;
+    if (i > h) i = h;
+    return i;
+}
+
diff --git a/modules/ssl/ssl_engine_vars.c b/modules/ssl/ssl_engine_vars.c
new file mode 100644
index 0000000..418d849
--- /dev/null
+++ b/modules/ssl/ssl_engine_vars.c
@@ -0,0 +1,1230 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_engine_vars.c
+ *  Variable Lookup Facility
+ */
+                             /* ``Those of you who think they
+                                  know everything are very annoying
+                                  to those of us who do.''
+                                                  -- Unknown       */
+#include "ssl_private.h"
+#include "mod_ssl.h"
+#include "ap_expr.h"
+
+#include "apr_time.h"
+
+/*  _________________________________________________________________
+**
+**  Variable Lookup
+**  _________________________________________________________________
+*/
+
+static char *ssl_var_lookup_ssl(apr_pool_t *p, SSLConnRec *sslconn, request_rec *r, char *var);
+static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs, char *var);
+static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, const char *var);
+static char *ssl_var_lookup_ssl_cert_san(apr_pool_t *p, X509 *xs, char *var);
+static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm);
+static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm);
+static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs);
+static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var);
+static char *ssl_var_lookup_ssl_cert_rfc4523_cea(apr_pool_t *p, SSL *ssl);
+static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs);
+static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, SSLConnRec *sslconn);
+static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, SSLConnRec *sslconn, char *var);
+static void  ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
+static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var);
+static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
+
+static SSLConnRec *ssl_get_effective_config(conn_rec *c)
+{
+    SSLConnRec *sslconn = myConnConfig(c);
+    if (!(sslconn && sslconn->ssl) && c->master) {
+        /* use master connection if no SSL defined here */
+        sslconn = myConnConfig(c->master);
+    }
+    return sslconn;
+}
+
+static int ssl_conn_is_ssl(conn_rec *c)
+{
+    const SSLConnRec *sslconn = ssl_get_effective_config(c);
+    return (sslconn && sslconn->ssl)? OK : DECLINED;
+}
+
+static const char var_interface[] = "mod_ssl/" AP_SERVER_BASEREVISION;
+static char var_library_interface[] = MODSSL_LIBRARY_TEXT;
+static char *var_library = NULL;
+
+static apr_array_header_t *expr_peer_ext_list_fn(ap_expr_eval_ctx_t *ctx,
+                                                 const void *dummy,
+                                                 const char *arg)
+{
+    return ssl_ext_list(ctx->p, ctx->c, 1, arg);
+}
+
+static const char *expr_var_fn(ap_expr_eval_ctx_t *ctx, const void *data)
+{
+    char *var = (char *)data;
+    SSLConnRec *sslconn = ssl_get_effective_config(ctx->c);
+
+    return sslconn ? ssl_var_lookup_ssl(ctx->p, sslconn, ctx->r, var) : NULL;
+}
+
+static const char *expr_func_fn(ap_expr_eval_ctx_t *ctx, const void *data,
+                                const char *arg)
+{
+    char *var = (char *)arg;
+
+    return var ? ssl_var_lookup(ctx->p, ctx->s, ctx->c, ctx->r, var) : NULL;
+}
+
+static int ssl_expr_lookup(ap_expr_lookup_parms *parms)
+{
+    switch (parms->type) {
+    case AP_EXPR_FUNC_VAR:
+        /* for now, we just handle everything that starts with SSL_, but
+         * register our hook as APR_HOOK_LAST
+         * XXX: This can be optimized
+         */
+        if (strcEQn(parms->name, "SSL_", 4)) {
+            *parms->func = expr_var_fn;
+            *parms->data = parms->name + 4;
+            return OK;
+        }
+        break;
+    case AP_EXPR_FUNC_STRING:
+        /* Function SSL() is implemented by us.
+         */
+        if (strcEQ(parms->name, "SSL")) {
+            *parms->func = expr_func_fn;
+            *parms->data = NULL;
+            return OK;
+        }
+        break;
+    case AP_EXPR_FUNC_LIST:
+        if (strcEQ(parms->name, "PeerExtList")) {
+            *parms->func = expr_peer_ext_list_fn;
+            *parms->data = "PeerExtList";
+            return OK;
+        }
+        break;
+    }
+    return DECLINED;
+}
+
+
+void ssl_var_register(apr_pool_t *p)
+{
+    char *cp, *cp2;
+
+    ap_hook_ssl_conn_is_ssl(ssl_conn_is_ssl, NULL, NULL, APR_HOOK_MIDDLE);
+    APR_REGISTER_OPTIONAL_FN(ssl_var_lookup);
+    APR_REGISTER_OPTIONAL_FN(ssl_ext_list);
+
+    /* Perform once-per-process library version determination: */
+    var_library = apr_pstrdup(p, MODSSL_LIBRARY_DYNTEXT);
+
+    if ((cp = strchr(var_library, ' ')) != NULL) {
+        *cp = '/';
+        if ((cp2 = strchr(cp, ' ')) != NULL)
+            *cp2 = NUL;
+    }
+
+    if ((cp = strchr(var_library_interface, ' ')) != NULL) {
+        *cp = '/';
+        if ((cp2 = strchr(cp, ' ')) != NULL)
+            *cp2 = NUL;
+    }
+
+    ap_hook_expr_lookup(ssl_expr_lookup, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+/* This function must remain safe to use for a non-SSL connection. */
+char *ssl_var_lookup(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, char *var)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    const char *result;
+    BOOL resdup;
+    apr_time_exp_t tm;
+
+    result = NULL;
+    resdup = TRUE;
+
+    /*
+     * When no pool is given try to find one
+     */
+    if (p == NULL) {
+        if (r != NULL)
+            p = r->pool;
+        else if (c != NULL)
+            p = c->pool;
+        else
+            p = mc->pPool;
+    }
+
+    /*
+     * Request dependent stuff
+     */
+    if (r != NULL) {
+        switch (var[0]) {
+        case 'H':
+        case 'h':
+            if (strcEQ(var, "HTTP_USER_AGENT"))
+                result = apr_table_get(r->headers_in, "User-Agent");
+            else if (strcEQ(var, "HTTP_REFERER"))
+                result = apr_table_get(r->headers_in, "Referer");
+            else if (strcEQ(var, "HTTP_COOKIE"))
+                result = apr_table_get(r->headers_in, "Cookie");
+            else if (strcEQ(var, "HTTP_FORWARDED"))
+                result = apr_table_get(r->headers_in, "Forwarded");
+            else if (strcEQ(var, "HTTP_HOST"))
+                result = apr_table_get(r->headers_in, "Host");
+            else if (strcEQ(var, "HTTP_PROXY_CONNECTION"))
+                result = apr_table_get(r->headers_in, "Proxy-Connection");
+            else if (strcEQ(var, "HTTP_ACCEPT"))
+                result = apr_table_get(r->headers_in, "Accept");
+            else if (strlen(var) > 5 && strcEQn(var, "HTTP:", 5))
+                /* all other headers from which we are still not know about */
+                result = apr_table_get(r->headers_in, var+5);
+            break;
+
+        case 'R':
+        case 'r':
+            if (strcEQ(var, "REQUEST_METHOD"))
+                result = r->method;
+            else if (strcEQ(var, "REQUEST_SCHEME"))
+                result = ap_http_scheme(r);
+            else if (strcEQ(var, "REQUEST_URI"))
+                result = r->uri;
+            else if (strcEQ(var, "REQUEST_FILENAME"))
+                result = r->filename;
+            else if (strcEQ(var, "REMOTE_ADDR"))
+                result = r->useragent_ip;
+            else if (strcEQ(var, "REMOTE_HOST"))
+                result = ap_get_useragent_host(r, REMOTE_NAME, NULL);
+            else if (strcEQ(var, "REMOTE_IDENT"))
+                result = ap_get_remote_logname(r);
+            else if (strcEQ(var, "REMOTE_USER"))
+                result = r->user;
+            break;
+
+        case 'S':
+        case 's':
+            if (strcEQn(var, "SSL", 3)) break; /* shortcut common case */
+
+            if (strcEQ(var, "SERVER_ADMIN"))
+                result = r->server->server_admin;
+            else if (strcEQ(var, "SERVER_NAME"))
+                result = ap_get_server_name_for_url(r);
+            else if (strcEQ(var, "SERVER_PORT"))
+                result = apr_psprintf(p, "%u", ap_get_server_port(r));
+            else if (strcEQ(var, "SERVER_PROTOCOL"))
+                result = r->protocol;
+            else if (strcEQ(var, "SCRIPT_FILENAME"))
+                result = r->filename;
+            break;
+
+        default:
+            if (strcEQ(var, "PATH_INFO"))
+                result = r->path_info;
+            else if (strcEQ(var, "QUERY_STRING"))
+                result = r->args;
+            else if (strcEQ(var, "IS_SUBREQ"))
+                result = (r->main != NULL ? "true" : "false");
+            else if (strcEQ(var, "DOCUMENT_ROOT"))
+                result = ap_document_root(r);
+            else if (strcEQ(var, "AUTH_TYPE"))
+                result = r->ap_auth_type;
+            else if (strcEQ(var, "THE_REQUEST"))
+                result = r->the_request;
+            else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
+                result = apr_table_get(r->notes, var+4);
+                if (result == NULL)
+                    result = apr_table_get(r->subprocess_env, var+4);
+            }
+            break;
+        }
+    }
+
+    /*
+     * Connection stuff
+     */
+    if (result == NULL && c != NULL) {
+        SSLConnRec *sslconn = ssl_get_effective_config(c);
+        if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
+            && sslconn && sslconn->ssl)
+            result = ssl_var_lookup_ssl(p, sslconn, r, var+4);
+        else if (strcEQ(var, "HTTPS")) {
+            if (sslconn && sslconn->ssl)
+                result = "on";
+            else
+                result = "off";
+        }
+    }
+
+    /*
+     * Totally independent stuff
+     */
+    if (result == NULL) {
+        if (strlen(var) > 12 && strcEQn(var, "SSL_VERSION_", 12))
+            result = ssl_var_lookup_ssl_version(p, var+12);
+        else if (strcEQ(var, "SERVER_SOFTWARE"))
+            result = ap_get_server_banner();
+        else if (strcEQ(var, "API_VERSION")) {
+            result = apr_itoa(p, MODULE_MAGIC_NUMBER_MAJOR);
+            resdup = FALSE;
+        }
+        else if (strcEQ(var, "TIME_YEAR")) {
+            apr_time_exp_lt(&tm, apr_time_now());
+            result = apr_psprintf(p, "%02d%02d",
+                                 (tm.tm_year / 100) + 19, tm.tm_year % 100);
+            resdup = FALSE;
+        }
+#define MKTIMESTR(format, tmfield) \
+            apr_time_exp_lt(&tm, apr_time_now()); \
+            result = apr_psprintf(p, format, tm.tmfield); \
+            resdup = FALSE;
+        else if (strcEQ(var, "TIME_MON")) {
+            MKTIMESTR("%02d", tm_mon+1)
+        }
+        else if (strcEQ(var, "TIME_DAY")) {
+            MKTIMESTR("%02d", tm_mday)
+        }
+        else if (strcEQ(var, "TIME_HOUR")) {
+            MKTIMESTR("%02d", tm_hour)
+        }
+        else if (strcEQ(var, "TIME_MIN")) {
+            MKTIMESTR("%02d", tm_min)
+        }
+        else if (strcEQ(var, "TIME_SEC")) {
+            MKTIMESTR("%02d", tm_sec)
+        }
+        else if (strcEQ(var, "TIME_WDAY")) {
+            MKTIMESTR("%d", tm_wday)
+        }
+        else if (strcEQ(var, "TIME")) {
+            apr_time_exp_lt(&tm, apr_time_now());
+            result = apr_psprintf(p,
+                        "%02d%02d%02d%02d%02d%02d%02d", (tm.tm_year / 100) + 19,
+                        (tm.tm_year % 100), tm.tm_mon+1, tm.tm_mday,
+                        tm.tm_hour, tm.tm_min, tm.tm_sec);
+            resdup = FALSE;
+        }
+        /* all other env-variables from the parent Apache process */
+        else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
+            result = getenv(var+4);
+        }
+    }
+
+    if (result != NULL && resdup)
+        result = apr_pstrdup(p, result);
+    if (result == NULL)
+        result = "";
+    return (char *)result;
+}
+
+static char *ssl_var_lookup_ssl(apr_pool_t *p, SSLConnRec *sslconn, 
+                                request_rec *r, char *var)
+{
+    char *result;
+    X509 *xs;
+    STACK_OF(X509) *sk;
+    SSL *ssl;
+
+    result = NULL;
+
+    ssl = sslconn->ssl;
+    if (strlen(var) > 8 && strcEQn(var, "VERSION_", 8)) {
+        result = ssl_var_lookup_ssl_version(p, var+8);
+    }
+    else if (ssl != NULL && strcEQ(var, "PROTOCOL")) {
+        result = (char *)SSL_get_version(ssl);
+    }
+    else if (ssl != NULL && strcEQ(var, "SESSION_ID")) {
+        char buf[MODSSL_SESSION_ID_STRING_LEN];
+        SSL_SESSION *pSession = SSL_get_session(ssl);
+        if (pSession) {
+            IDCONST unsigned char *id;
+            unsigned int idlen;
+
+#ifdef OPENSSL_NO_SSL_INTERN
+            id = (unsigned char *)SSL_SESSION_get_id(pSession, &idlen);
+#else
+            id = pSession->session_id;
+            idlen = pSession->session_id_length;
+#endif
+
+            result = apr_pstrdup(p, modssl_SSL_SESSION_id2sz(id, idlen,
+                                                             buf, sizeof(buf)));
+        }
+    }
+    else if(ssl != NULL && strcEQ(var, "SESSION_RESUMED")) {
+        if (SSL_session_reused(ssl) == 1)
+            result = "Resumed";
+        else
+            result = "Initial";
+    }
+    else if (ssl != NULL && strlen(var) >= 6 && strcEQn(var, "CIPHER", 6)) {
+        result = ssl_var_lookup_ssl_cipher(p, sslconn, var+6);
+    }
+    else if (ssl != NULL && strlen(var) > 18 && strcEQn(var, "CLIENT_CERT_CHAIN_", 18)) {
+        sk = SSL_get_peer_cert_chain(ssl);
+        result = ssl_var_lookup_ssl_cert_chain(p, sk, var+18);
+    }
+    else if (ssl != NULL && strcEQ(var, "CLIENT_CERT_RFC4523_CEA")) {
+        result = ssl_var_lookup_ssl_cert_rfc4523_cea(p, ssl);
+    }
+    else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY")) {
+        result = ssl_var_lookup_ssl_cert_verify(p, sslconn);
+    }
+    else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "CLIENT_", 7)) {
+        if ((xs = SSL_get_peer_certificate(ssl)) != NULL) {
+            result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
+            X509_free(xs);
+        }
+    }
+    else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "SERVER_", 7)) {
+        if ((xs = SSL_get_certificate(ssl)) != NULL) {
+            result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
+            /* SSL_get_certificate is different from SSL_get_peer_certificate.
+             * No need to X509_free(xs).
+             */
+        }
+    }
+    else if (ssl != NULL && strcEQ(var, "COMPRESS_METHOD")) {
+        result = ssl_var_lookup_ssl_compress_meth(ssl);
+    }
+#ifdef HAVE_TLSEXT
+    else if (ssl != NULL && strcEQ(var, "TLS_SNI")) {
+        result = apr_pstrdup(p, SSL_get_servername(ssl,
+                                                   TLSEXT_NAMETYPE_host_name));
+    }
+#endif
+    else if (ssl != NULL && strcEQ(var, "SECURE_RENEG")) {
+        int flag = 0;
+#ifdef SSL_get_secure_renegotiation_support
+        flag = SSL_get_secure_renegotiation_support(ssl);
+#endif
+        result = apr_pstrdup(p, flag ? "true" : "false");
+    }
+#ifdef HAVE_SRP
+    else if (ssl != NULL && strcEQ(var, "SRP_USER")) {
+        if ((result = SSL_get_srp_username(ssl)) != NULL) {
+            result = apr_pstrdup(p, result);
+        }
+    }
+    else if (ssl != NULL && strcEQ(var, "SRP_USERINFO")) {
+        if ((result = SSL_get_srp_userinfo(ssl)) != NULL) {
+            result = apr_pstrdup(p, result);
+        }
+    }
+#endif
+
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cert_dn_oneline(apr_pool_t *p, request_rec *r,
+                                                X509_NAME *xsname)
+{
+    char *result = NULL;
+    SSLDirConfigRec *dc;
+    int legacy_format = 0;
+    if (r) {
+        dc = myDirConfig(r);
+        legacy_format = dc->nOptions & SSL_OPT_LEGACYDNFORMAT;
+    }
+    if (legacy_format) {
+        char *cp = X509_NAME_oneline(xsname, NULL, 0);
+        result = apr_pstrdup(p, cp);
+        OPENSSL_free(cp);
+    }
+    else {
+        BIO* bio;
+        unsigned long flags = XN_FLAG_RFC2253 & ~ASN1_STRFLGS_ESC_MSB;
+
+        if ((bio = BIO_new(BIO_s_mem())) == NULL)
+            return NULL;
+        X509_NAME_print_ex(bio, xsname, 0, flags);
+
+        result = modssl_bio_free_read(p, bio);
+    }
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs,
+                                     char *var)
+{
+    char *result;
+    BOOL resdup;
+    X509_NAME *xsname;
+    int nid;
+
+    result = NULL;
+    resdup = TRUE;
+
+    if (strcEQ(var, "M_VERSION")) {
+        result = apr_psprintf(p, "%lu", X509_get_version(xs)+1);
+        resdup = FALSE;
+    }
+    else if (strcEQ(var, "M_SERIAL")) {
+        result = ssl_var_lookup_ssl_cert_serial(p, xs);
+    }
+    else if (strcEQ(var, "V_START")) {
+        result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notBefore(xs));
+    }
+    else if (strcEQ(var, "V_END")) {
+        result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notAfter(xs));
+    }
+    else if (strcEQ(var, "V_REMAIN")) {
+        result = ssl_var_lookup_ssl_cert_remain(p, X509_get_notAfter(xs));
+        resdup = FALSE;
+    }
+    else if (*var && strcEQ(var+1, "_DN")) {
+        if (*var == 'S')
+            xsname = X509_get_subject_name(xs);
+        else if (*var == 'I')
+            xsname = X509_get_issuer_name(xs);
+        else
+            return NULL;
+        result = ssl_var_lookup_ssl_cert_dn_oneline(p, r, xsname);
+        resdup = FALSE;
+    }
+    else if (strlen(var) > 5 && strcEQn(var+1, "_DN_", 4)) {
+        if (*var == 'S')
+            xsname = X509_get_subject_name(xs);
+        else if (*var == 'I')
+            xsname = X509_get_issuer_name(xs);
+        else
+            return NULL;
+        result = ssl_var_lookup_ssl_cert_dn(p, xsname, var+5);
+        resdup = FALSE;
+    }
+    else if (strlen(var) > 4 && strcEQn(var, "SAN_", 4)) {
+        result = ssl_var_lookup_ssl_cert_san(p, xs, var+4);
+        resdup = FALSE;
+    }
+    else if (strcEQ(var, "A_SIG")) {
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+        nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->signature->algorithm));
+#else
+        const ASN1_OBJECT *paobj;
+        X509_ALGOR_get0(&paobj, NULL, NULL, X509_get0_tbs_sigalg(xs));
+        nid = OBJ_obj2nid(paobj);
+#endif
+        result = apr_pstrdup(p,
+                             (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
+        resdup = FALSE;
+    }
+    else if (strcEQ(var, "A_KEY")) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+        nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->key->algor->algorithm));
+#else
+        ASN1_OBJECT *paobj;
+        X509_PUBKEY_get0_param(&paobj, NULL, 0, NULL, X509_get_X509_PUBKEY(xs));
+        nid = OBJ_obj2nid(paobj);
+#endif
+        result = apr_pstrdup(p,
+                             (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
+        resdup = FALSE;
+    }
+    else if (strcEQ(var, "CERT")) {
+        result = ssl_var_lookup_ssl_cert_PEM(p, xs);
+    }
+
+    if (resdup)
+        result = apr_pstrdup(p, result);
+    return result;
+}
+
+/* In this table, .extract is non-zero if RDNs using the NID should be
+ * extracted to for the SSL_{CLIENT,SERVER}_{I,S}_DN_* environment
+ * variables. */
+static const struct {
+    char *name;
+    int   nid;
+    int   extract;
+} ssl_var_lookup_ssl_cert_dn_rec[] = {
+    { "C",     NID_countryName,            1 },
+    { "ST",    NID_stateOrProvinceName,    1 }, /* officially    (RFC2156) */
+    { "SP",    NID_stateOrProvinceName,    0 }, /* compatibility (SSLeay)  */
+    { "L",     NID_localityName,           1 },
+    { "O",     NID_organizationName,       1 },
+    { "OU",    NID_organizationalUnitName, 1 },
+    { "CN",    NID_commonName,             1 },
+    { "T",     NID_title,                  1 },
+    { "I",     NID_initials,               1 },
+    { "G",     NID_givenName,              1 },
+    { "S",     NID_surname,                1 },
+    { "D",     NID_description,            1 },
+#ifdef NID_userId
+    { "UID",   NID_userId,                 1 },
+#endif
+    { "Email", NID_pkcs9_emailAddress,     1 },
+    { NULL,    0,                          0 }
+};
+
+static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname,
+                                        const char *var)
+{
+    const char *ptr;
+    char *result;
+    X509_NAME_ENTRY *xsne;
+    int i, j, n, idx = 0, raw = 0;
+    apr_size_t varlen;
+
+    ptr = ap_strrchr_c(var, '_');
+    if (ptr && ptr > var && strcmp(ptr + 1, "RAW") == 0) {
+        var = apr_pstrmemdup(p, var, ptr - var);
+        raw = 1;
+    }
+    
+    /* if an _N suffix is used, find the Nth attribute of given name */
+    ptr = ap_strchr_c(var, '_');
+    if (ptr != NULL && strspn(ptr + 1, "0123456789") == strlen(ptr + 1)) {
+        idx = atoi(ptr + 1);
+        varlen = ptr - var;
+    } else {
+        varlen = strlen(var);
+    }
+
+    result = NULL;
+
+    for (i = 0; ssl_var_lookup_ssl_cert_dn_rec[i].name != NULL; i++) {
+        if (strEQn(var, ssl_var_lookup_ssl_cert_dn_rec[i].name, varlen)
+            && strlen(ssl_var_lookup_ssl_cert_dn_rec[i].name) == varlen) {
+            for (j = 0; j < X509_NAME_entry_count(xsname); j++) {
+                xsne = X509_NAME_get_entry(xsname, j);
+
+                n =OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
+
+                if (n == ssl_var_lookup_ssl_cert_dn_rec[i].nid && idx-- == 0) {
+                    result = modssl_X509_NAME_ENTRY_to_string(p, xsne, raw);
+                    break;
+                }
+            }
+            break;
+        }
+    }
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cert_san(apr_pool_t *p, X509 *xs, char *var)
+{
+    int type;
+    apr_size_t numlen;
+    const char *onf = NULL;
+    apr_array_header_t *entries;
+
+    if (strcEQn(var, "Email_", 6)) {
+        type = GEN_EMAIL;
+        var += 6;
+    }
+    else if (strcEQn(var, "DNS_", 4)) {
+        type = GEN_DNS;
+        var += 4;
+    }
+    else if (strcEQn(var, "OTHER_", 6)) {
+        type = GEN_OTHERNAME;
+        var += 6;
+        if (strEQn(var, "msUPN_", 6)) {
+            var += 6;
+            onf = "msUPN";
+        }
+        else if (strEQn(var, "dnsSRV_", 7)) {
+            var += 7;
+            onf = "id-on-dnsSRV";
+        }
+        else
+           return NULL;
+    }
+    else
+        return NULL;
+
+    /* sanity check: number must be between 1 and 4 digits */
+    numlen = strspn(var, "0123456789");
+    if ((numlen < 1) || (numlen > 4) || (numlen != strlen(var)))
+        return NULL;
+
+    if (modssl_X509_getSAN(p, xs, type, onf, atoi(var), &entries))
+        /* return the first entry from this 1-element array */
+        return APR_ARRAY_IDX(entries, 0, char *);
+    else
+        return NULL;
+}
+
+static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm)
+{
+    BIO* bio;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL)
+        return NULL;
+    ASN1_TIME_print(bio, tm);
+
+    return modssl_bio_free_read(p, bio);
+}
+
+#define DIGIT2NUM(x) (((x)[0] - '0') * 10 + (x)[1] - '0')
+
+/* Return a string giving the number of days remaining until 'tm', or
+ * "0" if this can't be determined. */
+static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm)
+{
+    apr_time_t then, now = apr_time_now();
+    apr_time_exp_t exp = {0};
+    long diff;
+    unsigned char *dp;
+
+    /* Fail if the time isn't a valid ASN.1 TIME; RFC3280 mandates
+     * that the seconds digits are present even though ASN.1
+     * doesn't. */
+    if ((tm->type == V_ASN1_UTCTIME && tm->length < 11) ||
+        (tm->type == V_ASN1_GENERALIZEDTIME && tm->length < 13) ||
+        !ASN1_TIME_check(tm)) {
+        return apr_pstrdup(p, "0");
+    }
+
+    if (tm->type == V_ASN1_UTCTIME) {
+        exp.tm_year = DIGIT2NUM(tm->data);
+        if (exp.tm_year <= 50) exp.tm_year += 100;
+        dp = tm->data + 2;
+    } else {
+        exp.tm_year = DIGIT2NUM(tm->data) * 100 + DIGIT2NUM(tm->data + 2) - 1900;
+        dp = tm->data + 4;
+    }
+
+    exp.tm_mon = DIGIT2NUM(dp) - 1;
+    exp.tm_mday = DIGIT2NUM(dp + 2) + 1;
+    exp.tm_hour = DIGIT2NUM(dp + 4);
+    exp.tm_min = DIGIT2NUM(dp + 6);
+    exp.tm_sec = DIGIT2NUM(dp + 8);
+
+    if (apr_time_exp_gmt_get(&then, &exp) != APR_SUCCESS) {
+        return apr_pstrdup(p, "0");
+    }
+
+    diff = (long)((apr_time_sec(then) - apr_time_sec(now)) / (60*60*24));
+
+    return diff > 0 ? apr_ltoa(p, diff) : apr_pstrdup(p, "0");
+}
+
+static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs)
+{
+    BIO *bio;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL)
+        return NULL;
+    i2a_ASN1_INTEGER(bio, X509_get_serialNumber(xs));
+
+    return modssl_bio_free_read(p, bio);
+}
+
+static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var)
+{
+    char *result;
+    X509 *xs;
+    int n;
+
+    result = NULL;
+
+    if (strspn(var, "0123456789") == strlen(var)) {
+        n = atoi(var);
+        if (n < sk_X509_num(sk)) {
+            xs = sk_X509_value(sk, n);
+            result = ssl_var_lookup_ssl_cert_PEM(p, xs);
+        }
+    }
+
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cert_rfc4523_cea(apr_pool_t *p, SSL *ssl)
+{
+    char *result;
+    X509 *xs;
+
+    ASN1_INTEGER *serialNumber;
+
+    if (!(xs = SSL_get_peer_certificate(ssl))) {
+        return NULL;
+    }
+
+    result = NULL;
+
+    serialNumber = X509_get_serialNumber(xs);
+    if (serialNumber) {
+        X509_NAME *issuer = X509_get_issuer_name(xs);
+        if (issuer) {
+            BIGNUM *bn = ASN1_INTEGER_to_BN(serialNumber, NULL);
+            char *decimal = BN_bn2dec(bn);
+            result = apr_pstrcat(p, "{ serialNumber ", decimal,
+                    ", issuer rdnSequence:\"",
+                    modssl_X509_NAME_to_string(p, issuer, 0), "\" }", NULL);
+            OPENSSL_free(decimal);
+            BN_free(bn);
+        }
+    }
+
+    X509_free(xs);
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs)
+{
+    BIO *bio;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL)
+        return NULL;
+    PEM_write_bio_X509(bio, xs);
+
+    return modssl_bio_free_read(p, bio);
+}
+
+static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, SSLConnRec *sslconn)
+{
+    char *result;
+    long vrc;
+    const char *verr;
+    const char *vinfo;
+    SSL *ssl;
+    X509 *xs;
+
+    result = NULL;
+    ssl   = sslconn->ssl;
+    verr  = sslconn->verify_error;
+    vinfo = sslconn->verify_info;
+    vrc   = SSL_get_verify_result(ssl);
+    xs    = SSL_get_peer_certificate(ssl);
+
+    if (vrc == X509_V_OK && verr == NULL && xs == NULL)
+        /* no client verification done at all */
+        result = "NONE";
+    else if (vrc == X509_V_OK && verr == NULL && vinfo == NULL && xs != NULL)
+        /* client verification done successful */
+        result = "SUCCESS";
+    else if (vrc == X509_V_OK && vinfo != NULL && strEQ(vinfo, "GENEROUS"))
+        /* client verification done in generous way */
+        result = "GENEROUS";
+    else
+        /* client verification failed */
+        result = apr_psprintf(p, "FAILED:%s",
+                              verr ? verr : X509_verify_cert_error_string(vrc));
+
+    if (xs)
+        X509_free(xs);
+    return result;
+}
+
+static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, SSLConnRec *sslconn, char *var)
+{
+    char *result;
+    BOOL resdup;
+    int usekeysize, algkeysize;
+    SSL *ssl;
+
+    result = NULL;
+    resdup = TRUE;
+
+    ssl = sslconn->ssl;
+    ssl_var_lookup_ssl_cipher_bits(ssl, &usekeysize, &algkeysize);
+
+    if (ssl && strEQ(var, "")) {
+        MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
+        result = (cipher != NULL ? (char *)SSL_CIPHER_get_name(cipher) : NULL);
+    }
+    else if (strcEQ(var, "_EXPORT"))
+        result = (usekeysize < 56 ? "true" : "false");
+    else if (strcEQ(var, "_USEKEYSIZE")) {
+        result = apr_itoa(p, usekeysize);
+        resdup = FALSE;
+    }
+    else if (strcEQ(var, "_ALGKEYSIZE")) {
+        result = apr_itoa(p, algkeysize);
+        resdup = FALSE;
+    }
+
+    if (result != NULL && resdup)
+        result = apr_pstrdup(p, result);
+    return result;
+}
+
+static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize)
+{
+    MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher;
+
+    *usekeysize = 0;
+    *algkeysize = 0;
+    if (ssl != NULL)
+        if ((cipher = SSL_get_current_cipher(ssl)) != NULL)
+            *usekeysize = SSL_CIPHER_get_bits(cipher, algkeysize);
+    return;
+}
+
+static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var)
+{
+    if (strEQ(var, "INTERFACE")) {
+        return apr_pstrdup(p, var_interface);
+    }
+    else if (strEQ(var, "LIBRARY_INTERFACE")) {
+        return apr_pstrdup(p, var_library_interface);
+    }
+    else if (strEQ(var, "LIBRARY")) {
+        return apr_pstrdup(p, var_library);
+    }
+    return NULL;
+}
+
+/* Add each RDN in 'xn' to the table 't' where the NID is present in
+ * 'nids', using key prefix 'pfx'.  */
+static void extract_dn(apr_table_t *t, apr_hash_t *nids, const char *pfx,
+                       X509_NAME *xn, apr_pool_t *p)
+{
+    X509_NAME_ENTRY *xsne;
+    apr_hash_t *count;
+    int i, nid;
+
+    /* Hash of (int) NID -> (int *) counter to count each time an RDN
+     * with the given NID has been seen. */
+    count = apr_hash_make(p);
+
+    /* For each RDN... */
+    for (i = 0; i < X509_NAME_entry_count(xn); i++) {
+         const char *tag;
+         xsne = X509_NAME_get_entry(xn, i);
+
+         /* Retrieve the nid, and check whether this is one of the nids
+          * which are to be extracted. */
+         nid = OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
+
+         tag = apr_hash_get(nids, &nid, sizeof nid);
+         if (tag) {
+             const char *key;
+             int *dup;
+             char *value;
+
+             /* Check whether a variable with this nid was already
+              * been used; if so, use the foo_N=bar syntax. */
+             dup = apr_hash_get(count, &nid, sizeof nid);
+             if (dup) {
+                 key = apr_psprintf(p, "%s%s_%d", pfx, tag, ++(*dup));
+             }
+             else {
+                 /* Otherwise, use the plain foo=bar syntax. */
+                 dup = apr_pcalloc(p, sizeof *dup);
+                 apr_hash_set(count, &nid, sizeof nid, dup);
+                 key = apr_pstrcat(p, pfx, tag, NULL);
+             }
+             value = modssl_X509_NAME_ENTRY_to_string(p, xsne, 0);
+             apr_table_setn(t, key, value);
+         }
+    }
+}
+
+void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p)
+{
+    apr_hash_t *nids;
+    unsigned n;
+    X509 *xs;
+
+    /* Build up a hash table of (int *)NID->(char *)short-name for all
+     * the tags which are to be extracted: */
+    nids = apr_hash_make(p);
+    for (n = 0; ssl_var_lookup_ssl_cert_dn_rec[n].name; n++) {
+        if (ssl_var_lookup_ssl_cert_dn_rec[n].extract) {
+            apr_hash_set(nids, &ssl_var_lookup_ssl_cert_dn_rec[n].nid,
+                         sizeof(ssl_var_lookup_ssl_cert_dn_rec[0].nid),
+                         ssl_var_lookup_ssl_cert_dn_rec[n].name);
+        }
+    }
+
+    /* Extract the server cert DNS -- note that the refcount does NOT
+     * increase: */
+    xs = SSL_get_certificate(ssl);
+    if (xs) {
+        extract_dn(t, nids, "SSL_SERVER_S_DN_", X509_get_subject_name(xs), p);
+        extract_dn(t, nids, "SSL_SERVER_I_DN_", X509_get_issuer_name(xs), p);
+    }
+
+    /* Extract the client cert DNs -- note that the refcount DOES
+     * increase: */
+    xs = SSL_get_peer_certificate(ssl);
+    if (xs) {
+        extract_dn(t, nids, "SSL_CLIENT_S_DN_", X509_get_subject_name(xs), p);
+        extract_dn(t, nids, "SSL_CLIENT_I_DN_", X509_get_issuer_name(xs), p);
+        X509_free(xs);
+    }
+}
+
+static void extract_san_array(apr_table_t *t, const char *pfx,
+                              apr_array_header_t *entries, apr_pool_t *p)
+{
+    int i;
+
+    for (i = 0; i < entries->nelts; i++) {
+        const char *key = apr_psprintf(p, "%s_%d", pfx, i);
+        apr_table_setn(t, key, APR_ARRAY_IDX(entries, i, const char *));
+    }
+}
+
+void modssl_var_extract_san_entries(apr_table_t *t, SSL *ssl, apr_pool_t *p)
+{
+    X509 *xs;
+    apr_array_header_t *entries;
+
+    /* subjectAltName entries of the server certificate */
+    xs = SSL_get_certificate(ssl);
+    if (xs) {
+        if (modssl_X509_getSAN(p, xs, GEN_EMAIL, NULL, -1, &entries)) {
+            extract_san_array(t, "SSL_SERVER_SAN_Email", entries, p);
+        }
+        if (modssl_X509_getSAN(p, xs, GEN_DNS, NULL, -1, &entries)) {
+            extract_san_array(t, "SSL_SERVER_SAN_DNS", entries, p);
+        }
+        if (modssl_X509_getSAN(p, xs, GEN_OTHERNAME, "id-on-dnsSRV", -1,
+                               &entries)) {
+            extract_san_array(t, "SSL_SERVER_SAN_OTHER_dnsSRV", entries, p);
+        }
+        /* no need to free xs (refcount does not increase) */
+    }
+
+    /* subjectAltName entries of the client certificate */
+    xs = SSL_get_peer_certificate(ssl);
+    if (xs) {
+        if (modssl_X509_getSAN(p, xs, GEN_EMAIL, NULL, -1, &entries)) {
+            extract_san_array(t, "SSL_CLIENT_SAN_Email", entries, p);
+        }
+        if (modssl_X509_getSAN(p, xs, GEN_DNS, NULL, -1, &entries)) {
+            extract_san_array(t, "SSL_CLIENT_SAN_DNS", entries, p);
+        }
+        if (modssl_X509_getSAN(p, xs, GEN_OTHERNAME, "msUPN", -1, &entries)) {
+            extract_san_array(t, "SSL_CLIENT_SAN_OTHER_msUPN", entries, p);
+        }
+        X509_free(xs);
+    }
+}
+
+/* For an extension type which OpenSSL does not recognize, attempt to
+ * parse the extension type as a primitive string.  This will fail for
+ * any structured extension type per the docs.  Returns non-zero on
+ * success and writes the string to the given bio. */
+static int dump_extn_value(BIO *bio, ASN1_OCTET_STRING *str)
+{
+    const unsigned char *pp = str->data;
+    ASN1_STRING *ret = ASN1_STRING_new();
+    int rv = 0;
+
+    /* This allows UTF8String, IA5String, VisibleString, or BMPString;
+     * conversion to UTF-8 is forced. */
+    if (d2i_DISPLAYTEXT(&ret, &pp, str->length)) {
+        ASN1_STRING_print_ex(bio, ret, ASN1_STRFLGS_UTF8_CONVERT);
+        rv = 1;
+    }
+
+    ASN1_STRING_free(ret);
+    return rv;
+}
+
+apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer,
+                                 const char *extension)
+{
+    SSLConnRec *sslconn = ssl_get_effective_config(c);
+    SSL *ssl = NULL;
+    apr_array_header_t *array = NULL;
+    X509 *xs = NULL;
+    ASN1_OBJECT *oid = NULL;
+    int count = 0, j;
+
+    if (!sslconn || !sslconn->ssl || !extension) {
+        return NULL;
+    }
+    ssl = sslconn->ssl;
+
+    /* We accept the "extension" string to be converted as
+     * a long name (nsComment), short name (DN) or
+     * numeric OID (1.2.3.4).
+     */
+    oid = OBJ_txt2obj(extension, 0);
+    if (!oid) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01970)
+                      "could not parse OID '%s'", extension);
+        ERR_clear_error();
+        return NULL;
+    }
+
+    xs = peer ? SSL_get_peer_certificate(ssl) : SSL_get_certificate(ssl);
+    if (xs == NULL) {
+        return NULL;
+    }
+
+    count = X509_get_ext_count(xs);
+    /* Create an array large enough to accommodate every extension. This is
+     * likely overkill, but safe.
+     */
+    array = apr_array_make(p, count, sizeof(char *));
+    for (j = 0; j < count; j++) {
+        X509_EXTENSION *ext = X509_get_ext(xs, j);
+
+        if (OBJ_cmp(X509_EXTENSION_get_object(ext), oid) == 0) {
+            BIO *bio = BIO_new(BIO_s_mem());
+
+            /* We want to obtain a string representation of the extensions
+             * value and add it to the array we're building.
+             * X509V3_EXT_print() doesn't know about all the possible
+             * data types, but the value is stored as an ASN1_OCTET_STRING
+             * allowing us a fallback in case of X509V3_EXT_print
+             * not knowing how to handle the data.
+             */
+            if (X509V3_EXT_print(bio, ext, 0, 0) == 1 ||
+                dump_extn_value(bio, X509_EXTENSION_get_data(ext)) == 1) {
+                BUF_MEM *buf;
+                char **ptr = apr_array_push(array);
+                BIO_get_mem_ptr(bio, &buf);
+                *ptr = apr_pstrmemdup(p, buf->data, buf->length);
+            } else {
+                ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01971)
+                              "Found an extension '%s', but failed to "
+                              "create a string from it", extension);
+            }
+            BIO_vfree(bio);
+        }
+    }
+
+    if (array->nelts == 0)
+        array = NULL;
+
+    if (peer) {
+        /* only SSL_get_peer_certificate raises the refcount */
+        X509_free(xs);
+    }
+
+    ASN1_OBJECT_free(oid);
+    ERR_clear_error();
+    return array;
+}
+
+static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl)
+{
+    char *result = "NULL";
+#ifndef OPENSSL_NO_COMP
+    SSL_SESSION *pSession = SSL_get_session(ssl);
+
+    if (pSession) {
+#ifdef OPENSSL_NO_SSL_INTERN
+        switch (SSL_SESSION_get_compress_id(pSession)) {
+#else
+        switch (pSession->compress_meth) {
+#endif
+        case 0:
+            /* default "NULL" already set */
+            break;
+
+            /* Defined by RFC 3749, deflate is coded by "1" */
+        case 1:
+            result = "DEFLATE";
+            break;
+
+            /* IANA assigned compression number for LZS */
+        case 0x40:
+            result = "LZS";
+            break;
+
+        default:
+            result = "UNKNOWN";
+            break;
+        }
+    }
+#endif
+    return result;
+}
+
+/*  _________________________________________________________________
+**
+**  SSL Extension to mod_log_config
+**  _________________________________________________________________
+*/
+
+#include "../../modules/loggers/mod_log_config.h"
+
+static const char *ssl_var_log_handler_c(request_rec *r, char *a);
+static const char *ssl_var_log_handler_x(request_rec *r, char *a);
+
+/*
+ * register us for the mod_log_config function registering phase
+ * to establish %{...}c and to be able to expand %{...}x variables.
+ */
+void ssl_var_log_config_register(apr_pool_t *p)
+{
+    APR_OPTIONAL_FN_TYPE(ap_register_log_handler) *log_pfn_register;
+
+    log_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_log_handler);
+
+    if (log_pfn_register) {
+        log_pfn_register(p, "c", ssl_var_log_handler_c, 0);
+        log_pfn_register(p, "x", ssl_var_log_handler_x, 0);
+    }
+    return;
+}
+
+/*
+ * implement the %{..}c log function
+ * (we are the only function)
+ */
+static const char *ssl_var_log_handler_c(request_rec *r, char *a)
+{
+    SSLConnRec *sslconn = ssl_get_effective_config(r->connection);
+    char *result;
+
+    if (sslconn == NULL || sslconn->ssl == NULL)
+        return NULL;
+    result = NULL;
+    if (strEQ(a, "version"))
+        result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_PROTOCOL");
+    else if (strEQ(a, "cipher"))
+        result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CIPHER");
+    else if (strEQ(a, "subjectdn") || strEQ(a, "clientcert"))
+        result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_S_DN");
+    else if (strEQ(a, "issuerdn") || strEQ(a, "cacert"))
+        result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_I_DN");
+    else if (strEQ(a, "errcode"))
+        result = "-";
+    else if (strEQ(a, "errstr"))
+        result = (char *)sslconn->verify_error;
+    if (result != NULL && result[0] == NUL)
+        result = NULL;
+    return result;
+}
+
+/*
+ * extend the implementation of the %{..}x log function
+ * (there can be more functions)
+ */
+static const char *ssl_var_log_handler_x(request_rec *r, char *a)
+{
+    char *result;
+
+    result = ssl_var_lookup(r->pool, r->server, r->connection, r, a);
+    if (result != NULL && result[0] == NUL)
+        result = NULL;
+    return result;
+}
+
+
diff --git a/modules/ssl/ssl_private.h b/modules/ssl/ssl_private.h
new file mode 100644
index 0000000..cd8df07
--- /dev/null
+++ b/modules/ssl/ssl_private.h
@@ -0,0 +1,1174 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SSL_PRIVATE_H
+#define SSL_PRIVATE_H
+
+/**
+ * @file  ssl_private.h
+ * @brief Internal interfaces private to mod_ssl.
+ *
+ * @defgroup MOD_SSL_PRIVATE Private
+ * @ingroup MOD_SSL
+ * @{
+ */
+
+/** Apache headers */
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "http_connection.h"
+#include "http_request.h"
+#include "http_protocol.h"
+#include "http_ssl.h"
+#include "http_vhost.h"
+#include "util_script.h"
+#include "util_filter.h"
+#include "util_ebcdic.h"
+#include "util_mutex.h"
+#include "apr.h"
+#include "apr_strings.h"
+#define APR_WANT_STRFUNC
+#define APR_WANT_MEMFUNC
+#include "apr_want.h"
+#include "apr_tables.h"
+#include "apr_lib.h"
+#include "apr_fnmatch.h"
+#include "apr_strings.h"
+#include "apr_global_mutex.h"
+#include "apr_optional.h"
+#include "ap_socache.h"
+#include "mod_auth.h"
+
+/* The #ifdef macros are only defined AFTER including the above
+ * therefore we cannot include these system files at the top  :-(
+ */
+#if APR_HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#if APR_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#if APR_HAVE_UNISTD_H
+#include <unistd.h> /* needed for STDIN_FILENO et.al., at least on FreeBSD */
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef TRUE
+#define TRUE !FALSE
+#endif
+
+#ifndef BOOL
+#define BOOL unsigned int
+#endif
+
+#include "ap_expr.h"
+
+/* OpenSSL headers */
+#include <openssl/opensslv.h>
+#if (OPENSSL_VERSION_NUMBER >= 0x10001000)
+/* must be defined before including ssl.h */
+#define OPENSSL_NO_SSL_INTERN
+#endif
+#if OPENSSL_VERSION_NUMBER >= 0x30000000
+#include <openssl/core_names.h>
+#endif
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+#include <openssl/crypto.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/x509v3.h>
+#include <openssl/x509_vfy.h>
+#include <openssl/ocsp.h>
+
+/* Avoid tripping over an engine build installed globally and detected
+ * when the user points at an explicit non-engine flavor of OpenSSL
+ */
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+#include <openssl/engine.h>
+#endif
+
+#if (OPENSSL_VERSION_NUMBER < 0x0090801f)
+#error mod_ssl requires OpenSSL 0.9.8a or later
+#endif
+
+/**
+ * ...shifting sands of OpenSSL...
+ * Note: when adding support for new OpenSSL features, avoid explicit
+ * version number checks whenever possible, and use "feature-based"
+ * detection instead (check for definitions of constants or functions)
+ */
+#if (OPENSSL_VERSION_NUMBER >= 0x10000000)
+#define MODSSL_SSL_CIPHER_CONST const
+#define MODSSL_SSL_METHOD_CONST const
+#else
+#define MODSSL_SSL_CIPHER_CONST
+#define MODSSL_SSL_METHOD_CONST
+#endif
+
+#if defined(LIBRESSL_VERSION_NUMBER)
+/* Missing from LibreSSL */
+#if LIBRESSL_VERSION_NUMBER < 0x2060000f
+#define SSL_CTRL_SET_MIN_PROTO_VERSION          123
+#define SSL_CTRL_SET_MAX_PROTO_VERSION          124
+#define SSL_CTX_set_min_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
+#define SSL_CTX_set_max_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
+#endif /* LIBRESSL_VERSION_NUMBER < 0x2060000f */
+/* LibreSSL before 2.7 declares OPENSSL_VERSION_NUMBER == 2.0 but does not
+ * include most changes from OpenSSL >= 1.1 (new functions, macros, 
+ * deprecations, ...), so we have to work around this...
+ */
+#define MODSSL_USE_OPENSSL_PRE_1_1_API (LIBRESSL_VERSION_NUMBER < 0x2070000f)
+#else /* defined(LIBRESSL_VERSION_NUMBER) */
+#define MODSSL_USE_OPENSSL_PRE_1_1_API (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#endif
+
+#if defined(OPENSSL_FIPS) || OPENSSL_VERSION_NUMBER >= 0x30000000L
+#define HAVE_FIPS
+#endif
+
+#if defined(SSL_OP_NO_TLSv1_2)
+#define HAVE_TLSV1_X
+#endif
+
+#if defined(SSL_CONF_FLAG_FILE)
+#define HAVE_SSL_CONF_CMD
+#endif
+
+/* session id constness */
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define IDCONST
+#else
+#define IDCONST const
+#endif
+
+/**
+  * The following features all depend on TLS extension support.
+  * Within this block, check again for features (not version numbers).
+  */
+#if !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name)
+
+#define HAVE_TLSEXT
+
+/* ECC: make sure we have at least 1.0.0 */
+#if !defined(OPENSSL_NO_EC) && defined(TLSEXT_ECPOINTFORMAT_uncompressed)
+#define HAVE_ECC
+#endif
+
+/* OCSP stapling */
+#if !defined(OPENSSL_NO_OCSP) && defined(SSL_CTX_set_tlsext_status_cb)
+#define HAVE_OCSP_STAPLING
+/* All exist but are no longer macros since OpenSSL 1.1.0 */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+/* backward compatibility with OpenSSL < 1.0 */
+#ifndef sk_OPENSSL_STRING_num
+#define sk_OPENSSL_STRING_num sk_num
+#endif
+#ifndef sk_OPENSSL_STRING_value
+#define sk_OPENSSL_STRING_value sk_value
+#endif
+#ifndef sk_OPENSSL_STRING_pop
+#define sk_OPENSSL_STRING_pop sk_pop
+#endif
+#endif /* if OPENSSL_VERSION_NUMBER < 0x10100000L */
+#endif /* if !defined(OPENSSL_NO_OCSP) && defined(SSL_CTX_set_tlsext_status_cb) */
+
+/* TLS session tickets */
+#if defined(SSL_CTX_set_tlsext_ticket_key_cb)
+#define HAVE_TLS_SESSION_TICKETS
+#define TLSEXT_TICKET_KEY_LEN 48
+#ifndef tlsext_tick_md
+#ifdef OPENSSL_NO_SHA256
+#define tlsext_tick_md EVP_sha1
+#else
+#define tlsext_tick_md EVP_sha256
+#endif
+#endif
+#endif
+
+/* Secure Remote Password */
+#if !defined(OPENSSL_NO_SRP) && defined(SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB)
+#define HAVE_SRP
+#include <openssl/srp.h>
+#endif
+
+/* ALPN Protocol Negotiation */
+#if defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
+#define HAVE_TLS_ALPN
+#endif
+
+#endif /* !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name) */
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define BN_get_rfc2409_prime_768   get_rfc2409_prime_768
+#define BN_get_rfc2409_prime_1024  get_rfc2409_prime_1024
+#define BN_get_rfc3526_prime_1536  get_rfc3526_prime_1536
+#define BN_get_rfc3526_prime_2048  get_rfc3526_prime_2048
+#define BN_get_rfc3526_prime_3072  get_rfc3526_prime_3072
+#define BN_get_rfc3526_prime_4096  get_rfc3526_prime_4096
+#define BN_get_rfc3526_prime_6144  get_rfc3526_prime_6144
+#define BN_get_rfc3526_prime_8192  get_rfc3526_prime_8192
+#define BIO_set_init(x,v)          (x->init=v)
+#define BIO_get_data(x)            (x->ptr)
+#define BIO_set_data(x,v)          (x->ptr=v)
+#define BIO_get_shutdown(x)        (x->shutdown)
+#define BIO_set_shutdown(x,v)      (x->shutdown=v)
+#define DH_bits(x)                 (BN_num_bits(x->p))
+#else
+void init_bio_methods(void);
+void free_bio_methods(void);
+#endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10002000L || \
+	(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000f)
+#define X509_STORE_CTX_get0_store(x) (x->ctx)
+#endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10000000L
+#ifndef X509_STORE_CTX_get0_current_issuer
+#define X509_STORE_CTX_get0_current_issuer(x) (x->current_issuer)
+#endif
+#endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+#define HAVE_OPENSSL_KEYLOG
+#endif
+
+#ifdef HAVE_FIPS
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+#define modssl_fips_is_enabled() EVP_default_properties_is_fips_enabled(NULL)
+#define modssl_fips_enable(to)   EVP_default_properties_enable_fips(NULL, (to))
+#else
+#define modssl_fips_is_enabled() FIPS_mode()
+#define modssl_fips_enable(to)   FIPS_mode_set((to))
+#endif
+#endif /* HAVE_FIPS */
+
+/* mod_ssl headers */
+#include "ssl_util_ssl.h"
+
+APLOG_USE_MODULE(ssl);
+
+/*
+ * Provide reasonable default for some defines
+ */
+#ifndef PFALSE
+#define PFALSE ((void *)FALSE)
+#endif
+#ifndef PTRUE
+#define PTRUE ((void *)TRUE)
+#endif
+#ifndef UNSET
+#define UNSET (-1)
+#endif
+#ifndef NUL
+#define NUL '\0'
+#endif
+#ifndef RAND_MAX
+#include <limits.h>
+#define RAND_MAX INT_MAX
+#endif
+
+/**
+ * Provide reasonable defines for some types
+ */
+#ifndef UCHAR
+#define UCHAR unsigned char
+#endif
+
+/**
+ * Provide useful shorthands
+ */
+#define strEQ(s1,s2)     (strcmp(s1,s2)        == 0)
+#define strNE(s1,s2)     (strcmp(s1,s2)        != 0)
+#define strEQn(s1,s2,n)  (strncmp(s1,s2,n)     == 0)
+#define strNEn(s1,s2,n)  (strncmp(s1,s2,n)     != 0)
+
+#define strcEQ(s1,s2)    (strcasecmp(s1,s2)    == 0)
+#define strcNE(s1,s2)    (strcasecmp(s1,s2)    != 0)
+#define strcEQn(s1,s2,n) (strncasecmp(s1,s2,n) == 0)
+#define strcNEn(s1,s2,n) (strncasecmp(s1,s2,n) != 0)
+
+#define strIsEmpty(s)    (s == NULL || s[0] == NUL)
+
+#define myConnConfig(c) \
+    ((SSLConnRec *)ap_get_module_config(c->conn_config, &ssl_module))
+#define myConnConfigSet(c, val) \
+    ap_set_module_config(c->conn_config, &ssl_module, val)
+#define mySrvConfig(srv) \
+    ((SSLSrvConfigRec *)ap_get_module_config(srv->module_config,  &ssl_module))
+#define myDirConfig(req) \
+    ((SSLDirConfigRec *)ap_get_module_config(req->per_dir_config, &ssl_module))
+#define myConnCtxConfig(c, sc) \
+    (c->outgoing ? myConnConfig(c)->dc->proxy : sc->server)
+#define myModConfig(srv) mySrvConfig((srv))->mc
+#define mySrvFromConn(c) myConnConfig(c)->server
+#define myDirConfigFromConn(c) myConnConfig(c)->dc
+#define mySrvConfigFromConn(c) mySrvConfig(mySrvFromConn(c))
+#define myModConfigFromConn(c) myModConfig(mySrvFromConn(c))
+
+/**
+ * Defaults for the configuration
+ */
+#ifndef SSL_SESSION_CACHE_TIMEOUT
+#define SSL_SESSION_CACHE_TIMEOUT  300
+#endif
+
+/* Default setting for per-dir reneg buffer. */
+#ifndef DEFAULT_RENEG_BUFFER_SIZE
+#define DEFAULT_RENEG_BUFFER_SIZE (128 * 1024)
+#endif
+
+/* Default for OCSP response validity */
+#ifndef DEFAULT_OCSP_MAX_SKEW
+#define DEFAULT_OCSP_MAX_SKEW (60 * 5)
+#endif
+
+/* Default timeout for OCSP queries */
+#ifndef DEFAULT_OCSP_TIMEOUT
+#define DEFAULT_OCSP_TIMEOUT 10
+#endif
+
+/*
+ * For better backwards compatibility with the SSLCertificate[Key]File
+ * and SSLPassPhraseDialog ("exec" type) directives in 2.4.7 and earlier
+ */
+#ifdef HAVE_ECC
+#define CERTKEYS_IDX_MAX 2
+#else
+#define CERTKEYS_IDX_MAX 1
+#endif
+
+/**
+ * Define the SSL options
+ */
+#define SSL_OPT_NONE           (0)
+#define SSL_OPT_RELSET         (1<<0)
+#define SSL_OPT_STDENVVARS     (1<<1)
+#define SSL_OPT_EXPORTCERTDATA (1<<3)
+#define SSL_OPT_FAKEBASICAUTH  (1<<4)
+#define SSL_OPT_STRICTREQUIRE  (1<<5)
+#define SSL_OPT_OPTRENEGOTIATE (1<<6)
+#define SSL_OPT_LEGACYDNFORMAT (1<<7)
+typedef int ssl_opt_t;
+
+/**
+ * Define the SSL Protocol options
+ */
+#define SSL_PROTOCOL_NONE  (0)
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_SSLV3 (1<<1)
+#endif
+#define SSL_PROTOCOL_TLSV1 (1<<2)
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_BASIC (SSL_PROTOCOL_SSLV3|SSL_PROTOCOL_TLSV1)
+#else
+#define SSL_PROTOCOL_BASIC (SSL_PROTOCOL_TLSV1)
+#endif
+#ifdef HAVE_TLSV1_X
+#define SSL_PROTOCOL_TLSV1_1 (1<<3)
+#define SSL_PROTOCOL_TLSV1_2 (1<<4)
+#define SSL_PROTOCOL_TLSV1_3 (1<<5)
+
+#ifdef SSL_OP_NO_TLSv1_3
+#define SSL_HAVE_PROTOCOL_TLSV1_3   (1)
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC| \
+                            SSL_PROTOCOL_TLSV1_1|SSL_PROTOCOL_TLSV1_2|SSL_PROTOCOL_TLSV1_3)
+#else
+#define SSL_HAVE_PROTOCOL_TLSV1_3   (0)
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC| \
+                            SSL_PROTOCOL_TLSV1_1|SSL_PROTOCOL_TLSV1_2)
+#endif
+#else
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC)
+#endif
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_DEFAULT (SSL_PROTOCOL_ALL & ~SSL_PROTOCOL_SSLV3)
+#else
+#define SSL_PROTOCOL_DEFAULT (SSL_PROTOCOL_ALL)
+#endif
+typedef int ssl_proto_t;
+
+/**
+ * Define the SSL verify levels
+ */
+typedef enum {
+    SSL_CVERIFY_UNSET           = UNSET,
+    SSL_CVERIFY_NONE            = 0,
+    SSL_CVERIFY_OPTIONAL        = 1,
+    SSL_CVERIFY_REQUIRE         = 2,
+    SSL_CVERIFY_OPTIONAL_NO_CA  = 3
+} ssl_verify_t;
+
+#define SSL_VERIFY_PEER_STRICT \
+     (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
+
+#define ssl_verify_error_is_optional(errnum) \
+   ((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) \
+    || (errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) \
+    || (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) \
+    || (errnum == X509_V_ERR_CERT_UNTRUSTED) \
+    || (errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))
+
+/**
+  * CRL checking mask (mode | flags)
+  */
+typedef enum {
+    SSL_CRLCHECK_NONE  = (0),
+    SSL_CRLCHECK_LEAF  = (1 << 0),
+    SSL_CRLCHECK_CHAIN = (1 << 1),
+
+#define SSL_CRLCHECK_FLAGS (~0x3)
+    SSL_CRLCHECK_NO_CRL_FOR_CERT_OK = (1 << 2)
+} ssl_crlcheck_t;
+
+/**
+  * OCSP checking mask (mode | flags)
+  */
+typedef enum {
+    SSL_OCSPCHECK_NONE  = (0),
+    SSL_OCSPCHECK_LEAF  = (1 << 0),
+    SSL_OCSPCHECK_CHAIN = (1 << 1),
+    SSL_OCSPCHECK_NO_OCSP_FOR_CERT_OK = (1 << 2)
+} ssl_ocspcheck_t;
+
+/**
+ * Define the SSL pass phrase dialog types
+ */
+typedef enum {
+    SSL_PPTYPE_UNSET   = UNSET,
+    SSL_PPTYPE_BUILTIN = 0,
+    SSL_PPTYPE_FILTER  = 1,
+    SSL_PPTYPE_PIPE    = 2
+} ssl_pphrase_t;
+
+/**
+ * Define the Path Checking modes
+ */
+#define SSL_PCM_EXISTS     1
+#define SSL_PCM_ISREG      2
+#define SSL_PCM_ISDIR      4
+#define SSL_PCM_ISNONZERO  8
+typedef unsigned int ssl_pathcheck_t;
+
+/**
+ * Define the SSL enabled state
+ */
+typedef enum {
+    SSL_ENABLED_UNSET    = UNSET,
+    SSL_ENABLED_FALSE    = 0,
+    SSL_ENABLED_TRUE     = 1,
+    SSL_ENABLED_OPTIONAL = 3
+} ssl_enabled_t;
+
+/**
+ * Define the SSL requirement structure
+ */
+typedef struct {
+    const char     *cpExpr;
+    ap_expr_info_t *mpExpr;
+} ssl_require_t;
+
+/**
+ * Define the SSL random number generator seeding source
+ */
+typedef enum {
+    SSL_RSCTX_STARTUP = 1,
+    SSL_RSCTX_CONNECT = 2
+} ssl_rsctx_t;
+typedef enum {
+    SSL_RSSRC_BUILTIN = 1,
+    SSL_RSSRC_FILE    = 2,
+    SSL_RSSRC_EXEC    = 3,
+    SSL_RSSRC_EGD     = 4
+} ssl_rssrc_t;
+typedef struct {
+    ssl_rsctx_t  nCtx;
+    ssl_rssrc_t  nSrc;
+    char        *cpPath;
+    int          nBytes;
+} ssl_randseed_t;
+
+/**
+ * Define the structure of an ASN.1 anything
+ */
+typedef struct {
+    long int       nData;
+    unsigned char *cpData;
+    apr_time_t     source_mtime;
+} ssl_asn1_t;
+
+/**
+ * Define the mod_ssl per-module configuration structure
+ * (i.e. the global configuration for each httpd process)
+ */
+
+typedef struct SSLSrvConfigRec SSLSrvConfigRec;
+typedef struct SSLDirConfigRec SSLDirConfigRec;
+
+typedef enum {
+    SSL_SHUTDOWN_TYPE_UNSET,
+    SSL_SHUTDOWN_TYPE_STANDARD,
+    SSL_SHUTDOWN_TYPE_UNCLEAN,
+    SSL_SHUTDOWN_TYPE_ACCURATE
+} ssl_shutdown_type_e;
+
+typedef struct {
+    SSL *ssl;
+    const char *client_dn;
+    X509 *client_cert;
+    ssl_shutdown_type_e shutdown_type;
+    const char *verify_info;
+    const char *verify_error;
+    int verify_depth;
+    int disabled;
+    enum {
+        NON_SSL_OK = 0,        /* is SSL request, or error handling completed */
+        NON_SSL_SEND_REQLINE,  /* Need to send the fake request line */
+        NON_SSL_SEND_HDR_SEP,  /* Need to send the header separator */
+        NON_SSL_SET_ERROR_MSG  /* Need to set the error message */
+    } non_ssl_request;
+
+    /* Track the handshake/renegotiation state for the connection so
+     * that all client-initiated renegotiations can be rejected, as a
+     * partial fix for CVE-2009-3555. */
+    enum {
+        RENEG_INIT = 0, /* Before initial handshake */
+        RENEG_REJECT,   /* After initial handshake; any client-initiated
+                         * renegotiation should be rejected */
+        RENEG_ALLOW,    /* A server-initiated renegotiation is taking
+                         * place (as dictated by configuration) */
+        RENEG_ABORT     /* Renegotiation initiated by client, abort the
+                         * connection */
+    } reneg_state;
+
+    server_rec *server;
+    SSLDirConfigRec *dc;
+    
+    const char *cipher_suite; /* cipher suite used in last reneg */
+    int service_unavailable;  /* thouugh we negotiate SSL, no requests will be served */
+    int vhost_found;          /* whether we found vhost from SNI already */
+} SSLConnRec;
+
+/* BIG FAT WARNING: SSLModConfigRec has unusual memory lifetime: it is
+ * allocated out of the "process" pool and only a single such
+ * structure is created and used for the lifetime of the process.
+ * (The process pool is s->process->pool and is stored in the .pPool
+ * field.)  Most members of this structure are likewise allocated out
+ * of the process pool, but notably sesscache and sesscache_context
+ * are not.
+ *
+ * The structure is treated as mostly immutable after a single config
+ * parse has completed; the post_config hook (ssl_init_Module) flips
+ * the bFixed flag to true and subsequent invocations of the config
+ * callbacks hence do nothing.
+ *
+ * This odd lifetime strategy is used so that encrypted private keys
+ * can be decrypted once at startup and continue to be used across
+ * subsequent server reloads where the interactive password prompt is
+ * not possible.
+
+ * It is really an ABI nightmare waiting to happen since DSOs are
+ * reloaded across restarts, and nothing prevents the struct type
+ * changing across such reloads, yet the cached structure will be
+ * assumed to match regardless.
+ *
+ * This should really be fixed using a smaller structure which only
+ * stores that which is absolutely necessary (the private keys, maybe
+ * the random seed), and have that structure be strictly ABI-versioned
+ * for safety.
+ */
+typedef struct {
+    pid_t           pid;
+    apr_pool_t     *pPool;
+    BOOL            bFixed;
+
+    /* OpenSSL SSL_SESS_CACHE_* flags: */
+    long            sesscache_mode;
+
+    /* The configured provider, and associated private data
+     * structure. */
+    const ap_socache_provider_t *sesscache;
+    ap_socache_instance_t *sesscache_context;
+
+    apr_global_mutex_t   *pMutex;
+    apr_array_header_t   *aRandSeed;
+    apr_hash_t     *tVHostKeys;
+
+    /* A hash table of pointers to ssl_asn1_t structures.  The structures
+     * are used to store private keys in raw DER format (serialized OpenSSL
+     * PrivateKey structures).  The table is indexed by (vhost-id,
+     * index), for example the string "vhost.example.com:443:0". */
+    apr_hash_t     *tPrivateKey;
+
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    const char     *szCryptoDevice;
+#endif
+
+#ifdef HAVE_OCSP_STAPLING
+    const ap_socache_provider_t *stapling_cache;
+    ap_socache_instance_t *stapling_cache_context;
+    apr_global_mutex_t   *stapling_cache_mutex;
+    apr_global_mutex_t   *stapling_refresh_mutex;
+#endif
+#ifdef HAVE_OPENSSL_KEYLOG
+    /* Used for logging if SSLKEYLOGFILE is set at startup. */
+    apr_file_t      *keylog_file;
+#endif
+
+#ifdef HAVE_FIPS
+    BOOL             fips;
+#endif
+} SSLModConfigRec;
+
+/** Structure representing configured filenames for certs and keys for
+ * a given vhost */
+typedef struct {
+    /* Lists of configured certs and keys for this server */
+    apr_array_header_t *cert_files;
+    apr_array_header_t *key_files;
+
+    /** Certificates which specify the set of CA names which should be
+     * sent in the CertificateRequest message: */
+    const char  *ca_name_path;
+    const char  *ca_name_file;
+    
+    /* TLS service for this server is suspended */
+    int service_unavailable;
+} modssl_pk_server_t;
+
+typedef struct {
+    /** proxy can have any number of cert/key pairs */
+    const char  *cert_file;
+    const char  *cert_path;
+    const char  *ca_cert_file;
+    /* certs is a stack of configured cert, key pairs. */
+    STACK_OF(X509_INFO) *certs;
+    /* ca_certs contains ONLY chain certs for each item in certs.
+     * ca_certs[n] is a pointer to the (STACK_OF(X509) *) stack which
+     * holds the cert chain for the 'n'th cert in the certs stack, or
+     * NULL if no chain is configured. */
+    STACK_OF(X509) **ca_certs;
+} modssl_pk_proxy_t;
+
+/** stuff related to authentication that can also be per-dir */
+typedef struct {
+    /** known/trusted CAs */
+    const char  *ca_cert_path;
+    const char  *ca_cert_file;
+
+    const char  *cipher_suite;
+
+    /** for client or downstream server authentication */
+    int          verify_depth;
+    ssl_verify_t verify_mode;
+
+    /** TLSv1.3 has its separate cipher list, separate from the
+     settings for older TLS protocol versions. Since which one takes
+     effect is a matter of negotiation, we need separate settings */
+    const char  *tls13_ciphers;
+} modssl_auth_ctx_t;
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+typedef struct {
+    const char *file_path;
+    unsigned char key_name[16];
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    unsigned char hmac_secret[16];
+#else
+    OSSL_PARAM mac_params[3];
+#endif
+    unsigned char aes_key[16];
+} modssl_ticket_key_t;
+#endif
+
+#ifdef HAVE_SSL_CONF_CMD
+typedef struct {
+    const char *name;
+    const char *value;
+} ssl_ctx_param_t;
+#endif
+
+typedef struct {
+    SSLSrvConfigRec *sc; /** pointer back to server config */
+    SSL_CTX *ssl_ctx;
+
+    /** we are one or the other */
+    modssl_pk_server_t *pks;
+    modssl_pk_proxy_t  *pkp;
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    modssl_ticket_key_t *ticket_key;
+#endif
+
+    ssl_proto_t  protocol;
+    int protocol_set;
+
+    /** config for handling encrypted keys */
+    ssl_pphrase_t pphrase_dialog_type;
+    const char   *pphrase_dialog_path;
+
+    const char  *cert_chain;
+
+    /** certificate revocation list */
+    const char    *crl_path;
+    const char    *crl_file;
+    int            crl_check_mask;
+
+#ifdef HAVE_OCSP_STAPLING
+    /** OCSP stapling options */
+    BOOL        stapling_enabled;
+    long        stapling_resptime_skew;
+    long        stapling_resp_maxage;
+    int         stapling_cache_timeout;
+    BOOL        stapling_return_errors;
+    BOOL        stapling_fake_trylater;
+    int         stapling_errcache_timeout;
+    apr_interval_time_t stapling_responder_timeout;
+    const char *stapling_force_url;
+#endif
+
+#ifdef HAVE_SRP
+    char *srp_vfile;
+    char *srp_unknown_user_seed;
+    SRP_VBASE  *srp_vbase;
+#endif
+
+    modssl_auth_ctx_t auth;
+
+    int ocsp_mask;
+    BOOL ocsp_force_default; /* true if the default responder URL is
+                              * used regardless of per-cert URL */
+    const char *ocsp_responder; /* default responder URL */
+    long ocsp_resptime_skew;
+    long ocsp_resp_maxage;
+    apr_interval_time_t ocsp_responder_timeout;
+    BOOL ocsp_use_request_nonce;
+    apr_uri_t *proxy_uri;
+
+    BOOL ocsp_noverify; /* true if skipping OCSP certification verification like openssl -noverify */
+    /* Declare variables for using OCSP Responder Certs for OCSP verification */
+    int ocsp_verify_flags; /* Flags to use when verifying OCSP response */
+    const char *ocsp_certs_file; /* OCSP other certificates filename */
+    STACK_OF(X509) *ocsp_certs; /* OCSP other certificates */
+
+#ifdef HAVE_SSL_CONF_CMD
+    SSL_CONF_CTX *ssl_ctx_config; /* Configuration context */
+    apr_array_header_t *ssl_ctx_param; /* parameters to pass to SSL_CTX */
+#endif
+
+    BOOL ssl_check_peer_cn;
+    BOOL ssl_check_peer_name;
+    BOOL ssl_check_peer_expire;
+} modssl_ctx_t;
+
+struct SSLSrvConfigRec {
+    SSLModConfigRec *mc;
+    ssl_enabled_t    enabled;
+    const char      *vhost_id;
+    int              vhost_id_len;
+    int              session_cache_timeout;
+    BOOL             cipher_server_pref;
+    BOOL             insecure_reneg;
+    modssl_ctx_t    *server;
+#ifdef HAVE_TLSEXT
+    ssl_enabled_t    strict_sni_vhost_check;
+#endif
+#ifndef OPENSSL_NO_COMP
+    BOOL             compression;
+#endif
+    BOOL             session_tickets;
+};
+
+/**
+ * Define the mod_ssl per-directory configuration structure
+ * (i.e. the local configuration for all &lt;Directory>
+ *  and .htaccess contexts)
+ */
+struct SSLDirConfigRec {
+    BOOL          bSSLRequired;
+    apr_array_header_t *aRequirement;
+    ssl_opt_t     nOptions;
+    ssl_opt_t     nOptionsAdd;
+    ssl_opt_t     nOptionsDel;
+    const char   *szCipherSuite;
+    ssl_verify_t  nVerifyClient;
+    int           nVerifyDepth;
+    const char   *szUserName;
+    apr_size_t    nRenegBufferSize;
+
+    modssl_ctx_t *proxy;
+    BOOL          proxy_enabled;
+    BOOL          proxy_post_config;
+};
+
+/**
+ *  function prototypes
+ */
+
+/**  API glue structures  */
+extern module AP_MODULE_DECLARE_DATA ssl_module;
+
+/**  configuration handling   */
+SSLModConfigRec *ssl_config_global_create(server_rec *);
+void         ssl_config_global_fix(SSLModConfigRec *);
+BOOL         ssl_config_global_isfixed(SSLModConfigRec *);
+void        *ssl_config_server_create(apr_pool_t *, server_rec *);
+void        *ssl_config_server_merge(apr_pool_t *, void *, void *);
+void        *ssl_config_perdir_create(apr_pool_t *, char *);
+void        *ssl_config_perdir_merge(apr_pool_t *, void *, void *);
+void         ssl_config_proxy_merge(apr_pool_t *,
+                                    SSLDirConfigRec *, SSLDirConfigRec *);
+const char  *ssl_cmd_SSLPassPhraseDialog(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCryptoDevice(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRandomSeed(cmd_parms *, void *, const char *, const char *, const char *);
+const char  *ssl_cmd_SSLEngine(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCipherSuite(cmd_parms *, void *, const char *, const char *);
+const char  *ssl_cmd_SSLCertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCertificateKeyFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCertificateChainFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCACertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCACertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCADNRequestPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCADNRequestFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationCheck(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLHonorCipherOrder(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLCompression(cmd_parms *, void *, int flag);
+const char  *ssl_cmd_SSLSessionTickets(cmd_parms *, void *, int flag);
+const char  *ssl_cmd_SSLVerifyClient(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLVerifyDepth(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLSessionCache(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLSessionCacheTimeout(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProtocol(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLOptions(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRequireSSL(cmd_parms *, void *);
+const char  *ssl_cmd_SSLRequire(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLUserName(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRenegBufferSize(cmd_parms *cmd, void *dcfg, const char *arg);
+const char  *ssl_cmd_SSLStrictSNIVHostCheck(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLInsecureRenegotiation(cmd_parms *cmd, void *dcfg, int flag);
+
+const char  *ssl_cmd_SSLProxyEngine(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyProtocol(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCipherSuite(cmd_parms *, void *, const char *, const char *);
+const char  *ssl_cmd_SSLProxyVerify(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyVerifyDepth(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCACertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCACertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationCheck(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificateChainFile(cmd_parms *, void *, const char *);
+#ifdef HAVE_TLS_SESSION_TICKETS
+const char *ssl_cmd_SSLSessionTicketKeyFile(cmd_parms *cmd, void *dcfg, const char *arg);
+#endif
+const char  *ssl_cmd_SSLProxyCheckPeerExpire(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyCheckPeerCN(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyCheckPeerName(cmd_parms *cmd, void *dcfg, int flag);
+
+const char *ssl_cmd_SSLOCSPOverrideResponder(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLOCSPDefaultResponder(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponseTimeSkew(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponseMaxAge(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponderTimeout(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPUseRequestNonce(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLOCSPEnable(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPProxyURL(cmd_parms *cmd, void *dcfg, const char *arg);
+
+/* Declare OCSP Responder Certificate Verification Directive */
+const char *ssl_cmd_SSLOCSPNoVerify(cmd_parms *cmd, void *dcfg, int flag);
+/* Declare OCSP Responder Certificate File Directive */
+const char *ssl_cmd_SSLOCSPResponderCertificateFile(cmd_parms *cmd, void *dcfg, const char *arg);
+
+#ifdef HAVE_SSL_CONF_CMD
+const char *ssl_cmd_SSLOpenSSLConfCmd(cmd_parms *cmd, void *dcfg, const char *arg1, const char *arg2);
+#endif
+
+#ifdef HAVE_SRP
+const char *ssl_cmd_SSLSRPVerifierFile(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLSRPUnknownUserSeed(cmd_parms *cmd, void *dcfg, const char *arg);
+#endif
+
+const char *ssl_cmd_SSLFIPS(cmd_parms *cmd, void *dcfg, int flag);
+
+/**  module initialization  */
+apr_status_t ssl_init_Module(apr_pool_t *, apr_pool_t *, apr_pool_t *, server_rec *);
+apr_status_t ssl_init_Engine(server_rec *, apr_pool_t *);
+apr_status_t ssl_init_ConfigureServer(server_rec *, apr_pool_t *, apr_pool_t *, SSLSrvConfigRec *,
+                                      apr_array_header_t *);
+apr_status_t ssl_init_CheckServers(server_rec *, apr_pool_t *);
+int          ssl_proxy_section_post_config(apr_pool_t *p, apr_pool_t *plog,
+                                           apr_pool_t *ptemp, server_rec *s,
+                                           ap_conf_vector_t *section_config);
+STACK_OF(X509_NAME)
+            *ssl_init_FindCAList(server_rec *, apr_pool_t *, const char *, const char *);
+void         ssl_init_Child(apr_pool_t *, server_rec *);
+apr_status_t ssl_init_ModuleKill(void *data);
+
+/**  Apache API hooks  */
+int          ssl_hook_Auth(request_rec *);
+int          ssl_hook_UserCheck(request_rec *);
+int          ssl_hook_Access(request_rec *);
+int          ssl_hook_Fixup(request_rec *);
+int          ssl_hook_ReadReq(request_rec *);
+int          ssl_hook_Upgrade(request_rec *);
+void         ssl_hook_ConfigTest(apr_pool_t *pconf, server_rec *s);
+
+/** Apache authz provisders */
+extern const authz_provider ssl_authz_provider_require_ssl;
+extern const authz_provider ssl_authz_provider_verify_client;
+
+/**  OpenSSL callbacks */
+DH          *ssl_callback_TmpDH(SSL *, int, int);
+int          ssl_callback_SSLVerify(int, X509_STORE_CTX *);
+int          ssl_callback_SSLVerify_CRL(int, X509_STORE_CTX *, conn_rec *);
+int          ssl_callback_proxy_cert(SSL *ssl, X509 **x509, EVP_PKEY **pkey);
+int          ssl_callback_NewSessionCacheEntry(SSL *, SSL_SESSION *);
+SSL_SESSION *ssl_callback_GetSessionCacheEntry(SSL *, IDCONST unsigned char *, int, int *);
+void         ssl_callback_DelSessionCacheEntry(SSL_CTX *, SSL_SESSION *);
+void         ssl_callback_Info(const SSL *, int, int);
+#ifdef HAVE_TLSEXT
+int          ssl_callback_ServerNameIndication(SSL *, int *, modssl_ctx_t *);
+#endif
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+int          ssl_callback_ClientHello(SSL *, int *, void *);
+#endif
+#ifdef HAVE_TLS_SESSION_TICKETS
+int ssl_callback_SessionTicket(SSL *ssl,
+                               unsigned char *keyname,
+                               unsigned char *iv,
+                               EVP_CIPHER_CTX *cipher_ctx,
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+                               HMAC_CTX *hmac_ctx,
+#else
+                               EVP_MAC_CTX *mac_ctx,
+#endif
+                               int mode);
+#endif
+
+#ifdef HAVE_TLS_ALPN
+int ssl_callback_alpn_select(SSL *ssl, const unsigned char **out,
+                             unsigned char *outlen, const unsigned char *in,
+                             unsigned int inlen, void *arg);
+#endif
+
+/**  Session Cache Support  */
+apr_status_t ssl_scache_init(server_rec *, apr_pool_t *);
+void         ssl_scache_status_register(apr_pool_t *p);
+void         ssl_scache_kill(server_rec *);
+BOOL         ssl_scache_store(server_rec *, IDCONST UCHAR *, int,
+                              apr_time_t, SSL_SESSION *, apr_pool_t *);
+SSL_SESSION *ssl_scache_retrieve(server_rec *, IDCONST UCHAR *, int, apr_pool_t *);
+void         ssl_scache_remove(server_rec *, IDCONST UCHAR *, int,
+                               apr_pool_t *);
+
+/** OCSP Stapling Support */
+#ifdef HAVE_OCSP_STAPLING
+const char *ssl_cmd_SSLStaplingCache(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLUseStapling(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingResponseTimeSkew(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingResponseMaxAge(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingStandardCacheTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingErrorCacheTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingReturnResponderErrors(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingFakeTryLater(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingResponderTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingForceURL(cmd_parms *, void *, const char *);
+apr_status_t modssl_init_stapling(server_rec *, apr_pool_t *, apr_pool_t *, modssl_ctx_t *);
+void         ssl_stapling_certinfo_hash_init(apr_pool_t *);
+int          ssl_stapling_init_cert(server_rec *, apr_pool_t *, apr_pool_t *,
+                                    modssl_ctx_t *, X509 *);
+#endif
+#ifdef HAVE_SRP
+int          ssl_callback_SRPServerParams(SSL *, int *, void *);
+#endif
+
+#ifdef HAVE_OPENSSL_KEYLOG
+/* Callback used with SSL_CTX_set_keylog_callback. */
+void         modssl_callback_keylog(const SSL *ssl, const char *line);
+#endif
+
+/**  I/O  */
+void         ssl_io_filter_init(conn_rec *, request_rec *r, SSL *);
+void         ssl_io_filter_register(apr_pool_t *);
+long         ssl_io_data_cb(BIO *, int, const char *, int, long, long);
+
+/* ssl_io_buffer_fill fills the setaside buffering of the HTTP request
+ * to allow an SSL renegotiation to take place. */
+int          ssl_io_buffer_fill(request_rec *r, apr_size_t maxlen);
+
+/**  PRNG  */
+int          ssl_rand_seed(server_rec *, apr_pool_t *, ssl_rsctx_t, char *);
+
+/**  Utility Functions  */
+char        *ssl_util_vhostid(apr_pool_t *, server_rec *);
+apr_file_t  *ssl_util_ppopen(server_rec *, apr_pool_t *, const char *,
+                             const char * const *);
+void         ssl_util_ppclose(server_rec *, apr_pool_t *, apr_file_t *);
+char        *ssl_util_readfilter(server_rec *, apr_pool_t *, const char *,
+                                 const char * const *);
+BOOL         ssl_util_path_check(ssl_pathcheck_t, const char *, apr_pool_t *);
+#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API
+void         ssl_util_thread_setup(apr_pool_t *);
+void         ssl_util_thread_id_setup(apr_pool_t *);
+#endif
+int          ssl_init_ssl_connection(conn_rec *c, request_rec *r);
+
+BOOL         ssl_util_vhost_matches(const char *servername, server_rec *s);
+
+/**  Pass Phrase Support  */
+apr_status_t ssl_load_encrypted_pkey(server_rec *, apr_pool_t *, int,
+                                     const char *, apr_array_header_t **);
+
+/* Load public and/or private key from the configured ENGINE. Private
+ * key returned as *pkey.  certid can be NULL, in which case *pubkey
+ * is not altered.  Errors logged on failure. */
+apr_status_t modssl_load_engine_keypair(server_rec *s, apr_pool_t *p,
+                                        const char *vhostid,
+                                        const char *certid, const char *keyid,
+                                        X509 **pubkey, EVP_PKEY **privkey);
+
+/**  Diffie-Hellman Parameter Support  */
+DH           *ssl_dh_GetParamFromFile(const char *);
+#ifdef HAVE_ECC
+EC_GROUP     *ssl_ec_GetParamFromFile(const char *);
+#endif
+
+/* Store the EVP_PKEY key (serialized into DER) in the hash table with
+ * key, returning the ssl_asn1_t structure pointer. */
+ssl_asn1_t *ssl_asn1_table_set(apr_hash_t *table, const char *key,
+                               EVP_PKEY *pkey);
+/* Retrieve the ssl_asn1_t structure with given key from the hash. */
+ssl_asn1_t *ssl_asn1_table_get(apr_hash_t *table, const char *key);
+/* Remove and free the ssl_asn1_t structure with given key. */
+void ssl_asn1_table_unset(apr_hash_t *table, const char *key);
+
+/**  Mutex Support  */
+int          ssl_mutex_init(server_rec *, apr_pool_t *);
+int          ssl_mutex_reinit(server_rec *, apr_pool_t *);
+int          ssl_mutex_on(server_rec *);
+int          ssl_mutex_off(server_rec *);
+
+int          ssl_stapling_mutex_reinit(server_rec *, apr_pool_t *);
+
+/* mutex type names for Mutex directive */
+#define SSL_CACHE_MUTEX_TYPE    "ssl-cache"
+#define SSL_STAPLING_CACHE_MUTEX_TYPE "ssl-stapling"
+#define SSL_STAPLING_REFRESH_MUTEX_TYPE "ssl-stapling-refresh"
+
+apr_status_t ssl_die(server_rec *);
+
+/**  Logfile Support  */
+void         ssl_log_ssl_error(const char *, int, int, server_rec *);
+
+/* ssl_log_xerror, ssl_log_cxerror and ssl_log_rxerror are wrappers for the
+ * respective ap_log_*error functions and take a certificate as an
+ * additional argument (whose details are appended to the log message).
+ * The other arguments are interpreted exactly as with their ap_log_*error
+ * counterparts. */
+void ssl_log_xerror(const char *file, int line, int level,
+                    apr_status_t rv, apr_pool_t *p, server_rec *s,
+                    X509 *cert, const char *format, ...)
+    __attribute__((format(printf,8,9)));
+
+void ssl_log_cxerror(const char *file, int line, int level,
+                     apr_status_t rv, conn_rec *c, X509 *cert,
+                     const char *format, ...)
+    __attribute__((format(printf,7,8)));
+
+void ssl_log_rxerror(const char *file, int line, int level,
+                     apr_status_t rv, request_rec *r, X509 *cert,
+                     const char *format, ...)
+    __attribute__((format(printf,7,8)));
+
+#define SSLLOG_MARK              __FILE__,__LINE__
+
+/**  Variables  */
+
+/* Register variables for the lifetime of the process pool 'p'. */
+void         ssl_var_register(apr_pool_t *p);
+char        *ssl_var_lookup(apr_pool_t *, server_rec *, conn_rec *, request_rec *, char *);
+apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer, const char *extension);
+
+void         ssl_var_log_config_register(apr_pool_t *p);
+
+/* Extract SSL_*_DN_* variables into table 't' from SSL object 'ssl',
+ * allocating from 'p': */
+void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p);
+
+/* Extract SSL_*_SAN_* variables (subjectAltName entries) into table 't'
+ * from SSL object 'ssl', allocating from 'p'. */
+void modssl_var_extract_san_entries(apr_table_t *t, SSL *ssl, apr_pool_t *p);
+
+#ifndef OPENSSL_NO_OCSP
+/* Perform OCSP validation of the current cert in the given context.
+ * Returns non-zero on success or zero on failure.  On failure, the
+ * context error code is set. */
+int modssl_verify_ocsp(X509_STORE_CTX *ctx, SSLSrvConfigRec *sc,
+                       server_rec *s, conn_rec *c, apr_pool_t *pool);
+
+/* OCSP helper interface; dispatches the given OCSP request to the
+ * responder at the given URI.  Returns the decoded OCSP response
+ * object, or NULL on error (in which case, errors will have been
+ * logged).  Pool 'p' is used for temporary allocations. */
+OCSP_RESPONSE *modssl_dispatch_ocsp_request(const apr_uri_t *uri,
+                                            apr_interval_time_t timeout,
+                                            OCSP_REQUEST *request,
+                                            conn_rec *c, apr_pool_t *p);
+
+/* Initialize OCSP trusted certificate list */
+void ssl_init_ocsp_certificates(server_rec *s, modssl_ctx_t *mctx);
+
+#endif
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+/* Retrieve DH parameters for given key length.  Return value should
+ * be treated as unmutable, since it is stored in process-global
+ * memory. */
+DH *modssl_get_dh_params(unsigned keylen);
+#endif
+
+/* Returns non-zero if the request was made over SSL/TLS.  If sslconn
+ * is non-NULL and the request is using SSL/TLS, sets *sslconn to the
+ * corresponding SSLConnRec structure for the connection. */
+int modssl_request_is_tls(const request_rec *r, SSLConnRec **sslconn);
+
+int ssl_is_challenge(conn_rec *c, const char *servername, 
+                     X509 **pcert, EVP_PKEY **pkey,
+                    const char **pcert_file, const char **pkey_file);
+
+/* Returns non-zero if the cert/key filename should be handled through
+ * the configured ENGINE. */
+int modssl_is_engine_id(const char *name);
+
+#endif /* SSL_PRIVATE_H */
+/** @} */
+
diff --git a/modules/ssl/ssl_scache.c b/modules/ssl/ssl_scache.c
new file mode 100644
index 0000000..c0a0950
--- /dev/null
+++ b/modules/ssl/ssl_scache.c
@@ -0,0 +1,239 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_scache.c
+ *  Session Cache Abstraction
+ */
+                             /* ``Open-Source Software: generous
+                                  programmers from around the world all
+                                  join forces to help you shoot
+                                  yourself in the foot for free.''
+                                                 -- Unknown         */
+#include "ssl_private.h"
+#include "mod_status.h"
+
+/*  _________________________________________________________________
+**
+**  Session Cache: Common Abstraction Layer
+**  _________________________________________________________________
+*/
+
+apr_status_t ssl_scache_init(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+    struct ap_socache_hints hints;
+
+    /* The very first invocation of this function will be the
+     * post_config invocation during server startup; do nothing for
+     * this first (and only the first) time through, since the pool
+     * will be immediately cleared anyway.  For every subsequent
+     * invocation, initialize the configured cache. */
+    if (ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG)
+        return APR_SUCCESS;
+
+#ifdef HAVE_OCSP_STAPLING
+    if (mc->stapling_cache) {
+        memset(&hints, 0, sizeof hints);
+        hints.avg_obj_size = 1500;
+        hints.avg_id_len = 20;
+        hints.expiry_interval = 300;
+
+        rv = mc->stapling_cache->init(mc->stapling_cache_context,
+                                     "mod_ssl-staple", &hints, s, p);
+        if (rv) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01872)
+                         "Could not initialize stapling cache. Exiting.");
+            return ssl_die(s);
+        }
+    }
+#endif
+
+    /*
+     * Warn the user that he should use the session cache.
+     * But we can operate without it, of course.
+     */
+    if (mc->sesscache == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01873)
+                     "Init: Session Cache is not configured "
+                     "[hint: SSLSessionCache]");
+        return APR_SUCCESS;
+    }
+
+    memset(&hints, 0, sizeof hints);
+    hints.avg_obj_size = 150;
+    hints.avg_id_len = 30;
+    hints.expiry_interval = 30;
+
+    rv = mc->sesscache->init(mc->sesscache_context, "mod_ssl-sess", &hints, s, p);
+    if (rv) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01874)
+                     "Could not initialize session cache. Exiting.");
+        return ssl_die(s);
+    }
+
+    return APR_SUCCESS;
+}
+
+void ssl_scache_kill(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    if (mc->sesscache) {
+        mc->sesscache->destroy(mc->sesscache_context, s);
+    }
+
+#ifdef HAVE_OCSP_STAPLING
+    if (mc->stapling_cache) {
+        mc->stapling_cache->destroy(mc->stapling_cache_context, s);
+    }
+#endif
+
+}
+
+BOOL ssl_scache_store(server_rec *s, IDCONST UCHAR *id, int idlen,
+                      apr_time_t expiry, SSL_SESSION *sess,
+                      apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    unsigned char encoded[MODSSL_SESSION_MAX_DER], *ptr;
+    unsigned int len;
+    apr_status_t rv;
+
+    /* Serialise the session. */
+    len = i2d_SSL_SESSION(sess, NULL);
+    if (len > sizeof encoded) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01875)
+                     "session is too big (%u bytes)", len);
+        return FALSE;
+    }
+
+    ptr = encoded;
+    len = i2d_SSL_SESSION(sess, &ptr);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_on(s);
+    }
+
+    rv = mc->sesscache->store(mc->sesscache_context, s, id, idlen,
+                              expiry, encoded, len, p);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_off(s);
+    }
+
+    return rv == APR_SUCCESS ? TRUE : FALSE;
+}
+
+SSL_SESSION *ssl_scache_retrieve(server_rec *s, IDCONST UCHAR *id, int idlen,
+                                 apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    unsigned char dest[MODSSL_SESSION_MAX_DER];
+    unsigned int destlen = MODSSL_SESSION_MAX_DER;
+    const unsigned char *ptr;
+    apr_status_t rv;
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_on(s);
+    }
+
+    rv = mc->sesscache->retrieve(mc->sesscache_context, s, id, idlen,
+                                 dest, &destlen, p);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_off(s);
+    }
+
+    if (rv != APR_SUCCESS) {
+        return NULL;
+    }
+
+    ptr = dest;
+
+    return d2i_SSL_SESSION(NULL, &ptr, destlen);
+}
+
+void ssl_scache_remove(server_rec *s, IDCONST UCHAR *id, int idlen,
+                       apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_on(s);
+    }
+
+    mc->sesscache->remove(mc->sesscache_context, s, id, idlen, p);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_off(s);
+    }
+}
+
+/*  _________________________________________________________________
+**
+**  SSL Extension to mod_status
+**  _________________________________________________________________
+*/
+static int ssl_ext_status_hook(request_rec *r, int flags)
+{
+    SSLModConfigRec *mc = myModConfig(r->server);
+
+    if (mc == NULL || mc->sesscache == NULL)
+        return OK;
+
+    if (!(flags & AP_STATUS_SHORT)) {
+        ap_rputs("<hr>\n", r);
+        ap_rputs("<table cellspacing=0 cellpadding=0>\n", r);
+        ap_rputs("<tr><td bgcolor=\"#000000\">\n", r);
+        ap_rputs("<b><font color=\"#ffffff\" face=\"Arial,Helvetica\">SSL/TLS Session Cache Status:</font></b>\r", r);
+        ap_rputs("</td></tr>\n", r);
+        ap_rputs("<tr><td bgcolor=\"#ffffff\">\n", r);
+    }
+    else {
+        ap_rputs("TLSSessionCacheStatus\n", r);
+    }
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_on(r->server);
+    }
+
+    mc->sesscache->status(mc->sesscache_context, r, flags);
+
+    if (mc->sesscache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        ssl_mutex_off(r->server);
+    }
+
+    if (!(flags & AP_STATUS_SHORT)) {
+        ap_rputs("</td></tr>\n", r);
+        ap_rputs("</table>\n", r);
+    }
+
+    return OK;
+}
+
+void ssl_scache_status_register(apr_pool_t *p)
+{
+    APR_OPTIONAL_HOOK(ap, status_hook, ssl_ext_status_hook, NULL, NULL,
+                      APR_HOOK_MIDDLE);
+}
+
diff --git a/modules/ssl/ssl_util.c b/modules/ssl/ssl_util.c
new file mode 100644
index 0000000..c889295
--- /dev/null
+++ b/modules/ssl/ssl_util.c
@@ -0,0 +1,485 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_util.c
+ *  Utility Functions
+ */
+                             /* ``Every day of my life
+                                  I am forced to add another
+                                  name to the list of people
+                                  who piss me off!''
+                                            -- Calvin          */
+
+#include "ssl_private.h"
+#include "ap_mpm.h"
+#include "apr_thread_mutex.h"
+
+/*  _________________________________________________________________
+**
+**  Utility Functions
+**  _________________________________________________________________
+*/
+
+char *ssl_util_vhostid(apr_pool_t *p, server_rec *s)
+{
+    SSLSrvConfigRec *sc;
+    apr_port_t port;
+
+    if (s->port != 0)
+        port = s->port;
+    else {
+        sc = mySrvConfig(s);
+        port = sc->enabled == TRUE ? DEFAULT_HTTPS_PORT : DEFAULT_HTTP_PORT;
+    }
+
+    return apr_psprintf(p, "%s:%lu", s->server_hostname, (unsigned long)port);
+}
+
+/*
+ * Return TRUE iff the given servername matches the server record when
+ * selecting virtual hosts.
+ */
+BOOL ssl_util_vhost_matches(const char *servername, server_rec *s)
+{
+    apr_array_header_t *names;
+    int i;
+    
+    /* check ServerName */
+    if (!strcasecmp(servername, s->server_hostname)) {
+        return TRUE;
+    }
+    
+    /*
+     * if not matched yet, check ServerAlias entries
+     * (adapted from vhost.c:matches_aliases())
+     */
+    names = s->names;
+    if (names) {
+        char **name = (char **)names->elts;
+        for (i = 0; i < names->nelts; ++i) {
+            if (!name[i])
+                continue;
+            if (!strcasecmp(servername, name[i])) {
+                return TRUE;
+            }
+        }
+    }
+    
+    /* if still no match, check ServerAlias entries with wildcards */
+    names = s->wild_names;
+    if (names) {
+        char **name = (char **)names->elts;
+        for (i = 0; i < names->nelts; ++i) {
+            if (!name[i])
+                continue;
+            if (!ap_strcasecmp_match(servername, name[i])) {
+                return TRUE;
+            }
+        }
+    }
+    
+    return FALSE;
+}
+
+int modssl_request_is_tls(const request_rec *r, SSLConnRec **scout)
+{
+    SSLConnRec *sslconn = myConnConfig(r->connection);
+    SSLSrvConfigRec *sc = mySrvConfig(r->server);
+
+    if (!(sslconn && sslconn->ssl) && r->connection->master) {
+        sslconn = myConnConfig(r->connection->master);
+    }
+
+    if (sc->enabled == SSL_ENABLED_FALSE || !sslconn || !sslconn->ssl)
+        return 0;
+    
+    if (scout) *scout = sslconn;
+
+    return 1;
+}
+
+apr_file_t *ssl_util_ppopen(server_rec *s, apr_pool_t *p, const char *cmd,
+                            const char * const *argv)
+{
+    apr_procattr_t *procattr;
+    apr_proc_t *proc;
+
+    if (apr_procattr_create(&procattr, p) != APR_SUCCESS)
+        return NULL;
+    if (apr_procattr_io_set(procattr, APR_FULL_BLOCK, APR_FULL_BLOCK,
+                            APR_FULL_BLOCK) != APR_SUCCESS)
+        return NULL;
+    if (apr_procattr_dir_set(procattr,
+                             ap_make_dirstr_parent(p, cmd)) != APR_SUCCESS)
+        return NULL;
+    if (apr_procattr_cmdtype_set(procattr, APR_PROGRAM) != APR_SUCCESS)
+        return NULL;
+    proc = apr_pcalloc(p, sizeof(apr_proc_t));
+    if (apr_proc_create(proc, cmd, argv, NULL, procattr, p) != APR_SUCCESS)
+        return NULL;
+    return proc->out;
+}
+
+void ssl_util_ppclose(server_rec *s, apr_pool_t *p, apr_file_t *fp)
+{
+    apr_file_close(fp);
+    return;
+}
+
+/*
+ * Run a filter program and read the first line of its stdout output
+ */
+char *ssl_util_readfilter(server_rec *s, apr_pool_t *p, const char *cmd,
+                          const char * const *argv)
+{
+    static char buf[MAX_STRING_LEN];
+    apr_file_t *fp;
+    apr_size_t nbytes = 1;
+    char c;
+    int k;
+
+    if ((fp = ssl_util_ppopen(s, p, cmd, argv)) == NULL)
+        return NULL;
+    /* XXX: we are reading 1 byte at a time here */
+    for (k = 0; apr_file_read(fp, &c, &nbytes) == APR_SUCCESS
+                && nbytes == 1 && (k < MAX_STRING_LEN-1)     ; ) {
+        if (c == '\n' || c == '\r')
+            break;
+        buf[k++] = c;
+    }
+    buf[k] = NUL;
+    ssl_util_ppclose(s, p, fp);
+
+    return buf;
+}
+
+BOOL ssl_util_path_check(ssl_pathcheck_t pcm, const char *path, apr_pool_t *p)
+{
+    apr_finfo_t finfo;
+
+    if (path == NULL)
+        return FALSE;
+    if (pcm & SSL_PCM_EXISTS && apr_stat(&finfo, path,
+                                APR_FINFO_TYPE|APR_FINFO_SIZE, p) != 0)
+        return FALSE;
+    AP_DEBUG_ASSERT((pcm & SSL_PCM_EXISTS) ||
+                    !(pcm & (SSL_PCM_ISREG|SSL_PCM_ISDIR|SSL_PCM_ISNONZERO)));
+    if (pcm & SSL_PCM_ISREG && finfo.filetype != APR_REG)
+        return FALSE;
+    if (pcm & SSL_PCM_ISDIR && finfo.filetype != APR_DIR)
+        return FALSE;
+    if (pcm & SSL_PCM_ISNONZERO && finfo.size <= 0)
+        return FALSE;
+    return TRUE;
+}
+
+/* Decrypted private keys are cached to survive restarts.  The cached
+ * data must have lifetime of the process (hence malloc/free rather
+ * than pools), and uses raw DER since the EVP_PKEY structure
+ * internals may not survive across a module reload. */
+ssl_asn1_t *ssl_asn1_table_set(apr_hash_t *table, const char *key,
+                               EVP_PKEY *pkey)
+{
+    apr_ssize_t klen = strlen(key);
+    ssl_asn1_t *asn1 = apr_hash_get(table, key, klen);
+    apr_size_t length = i2d_PrivateKey(pkey, NULL);
+    unsigned char *p;
+
+    /* Re-use structure if cached previously. */
+    if (asn1) {
+        if (asn1->nData != length) {
+            asn1->cpData = ap_realloc(asn1->cpData, length);
+        }
+    }
+    else {
+        asn1 = ap_malloc(sizeof(*asn1));
+        asn1->source_mtime = 0; /* used as a note for encrypted private keys */
+        asn1->cpData = ap_malloc(length);
+
+        apr_hash_set(table, key, klen, asn1);
+    }
+
+    asn1->nData = length;
+    p = asn1->cpData;
+    i2d_PrivateKey(pkey, &p); /* increases p by length */
+
+    return asn1;
+}
+
+ssl_asn1_t *ssl_asn1_table_get(apr_hash_t *table,
+                               const char *key)
+{
+    return (ssl_asn1_t *)apr_hash_get(table, key, APR_HASH_KEY_STRING);
+}
+
+void ssl_asn1_table_unset(apr_hash_t *table,
+                          const char *key)
+{
+    apr_ssize_t klen = strlen(key);
+    ssl_asn1_t *asn1 = apr_hash_get(table, key, klen);
+
+    if (!asn1) {
+        return;
+    }
+
+    if (asn1->cpData) {
+        free(asn1->cpData);
+    }
+    free(asn1);
+
+    apr_hash_set(table, key, klen, NULL);
+}
+
+#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API
+
+/*
+ * To ensure thread-safetyness in OpenSSL - work in progress
+ */
+
+static apr_thread_mutex_t **lock_cs;
+static int                  lock_num_locks;
+
+static void ssl_util_thr_lock(int mode, int type,
+                              const char *file, int line)
+{
+    if (type < lock_num_locks) {
+        if (mode & CRYPTO_LOCK) {
+            apr_thread_mutex_lock(lock_cs[type]);
+        }
+        else {
+            apr_thread_mutex_unlock(lock_cs[type]);
+        }
+    }
+}
+
+/* Dynamic lock structure */
+struct CRYPTO_dynlock_value {
+    apr_pool_t *pool;
+    const char* file;
+    int line;
+    apr_thread_mutex_t *mutex;
+};
+
+/* Global reference to the pool passed into ssl_util_thread_setup() */
+apr_pool_t *dynlockpool = NULL;
+
+/*
+ * Dynamic lock creation callback
+ */
+static struct CRYPTO_dynlock_value *ssl_dyn_create_function(const char *file,
+                                                     int line)
+{
+    struct CRYPTO_dynlock_value *value;
+    apr_pool_t *p;
+    apr_status_t rv;
+
+    /*
+     * We need a pool to allocate our mutex.  Since we can't clear
+     * allocated memory from a pool, create a subpool that we can blow
+     * away in the destruction callback.
+     */
+    apr_pool_create(&p, dynlockpool);
+    apr_pool_tag(p, "modssl_dynlock_value");
+    ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE1, 0, p,
+                  "Creating dynamic lock");
+
+    value = apr_palloc(p, sizeof(struct CRYPTO_dynlock_value));
+    value->pool = p;
+    /* Keep our own copy of the place from which we were created,
+       using our own pool. */
+    value->file = apr_pstrdup(p, file);
+    value->line = line;
+    rv = apr_thread_mutex_create(&(value->mutex), APR_THREAD_MUTEX_DEFAULT,
+                                p);
+    if (rv != APR_SUCCESS) {
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_ERR, rv, p, APLOGNO(02186)
+                      "Failed to create thread mutex for dynamic lock");
+        apr_pool_destroy(p);
+        return NULL;
+    }
+    return value;
+}
+
+/*
+ * Dynamic locking and unlocking function
+ */
+
+static void ssl_dyn_lock_function(int mode, struct CRYPTO_dynlock_value *l,
+                           const char *file, int line)
+{
+    apr_status_t rv;
+
+    if (mode & CRYPTO_LOCK) {
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE3, 0, l->pool,
+                      "Acquiring mutex %s:%d", l->file, l->line);
+        rv = apr_thread_mutex_lock(l->mutex);
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE3, rv, l->pool,
+                      "Mutex %s:%d acquired!", l->file, l->line);
+    }
+    else {
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE3, 0, l->pool,
+                      "Releasing mutex %s:%d", l->file, l->line);
+        rv = apr_thread_mutex_unlock(l->mutex);
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE3, rv, l->pool,
+                      "Mutex %s:%d released!", l->file, l->line);
+    }
+}
+
+/*
+ * Dynamic lock destruction callback
+ */
+static void ssl_dyn_destroy_function(struct CRYPTO_dynlock_value *l,
+                          const char *file, int line)
+{
+    apr_status_t rv;
+
+    ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_TRACE1, 0, l->pool,
+                  "Destroying dynamic lock %s:%d", l->file, l->line);
+    rv = apr_thread_mutex_destroy(l->mutex);
+    if (rv != APR_SUCCESS) {
+        ap_log_perror(file, line, APLOG_MODULE_INDEX, APLOG_ERR, rv, l->pool,
+                      APLOGNO(02192) "Failed to destroy mutex for dynamic "
+                      "lock %s:%d", l->file, l->line);
+    }
+
+    /* Trust that whomever owned the CRYPTO_dynlock_value we were
+     * passed has no future use for it...
+     */
+    apr_pool_destroy(l->pool);
+}
+
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+
+static void ssl_util_thr_id(CRYPTO_THREADID *id)
+{
+    /* OpenSSL needs this to return an unsigned long.  On OS/390, the pthread
+     * id is a structure twice that big.  Use the TCB pointer instead as a
+     * unique unsigned long.
+     */
+#ifdef __MVS__
+    struct PSA {
+        char unmapped[540]; /* PSATOLD is at offset 540 in the PSA */
+        unsigned long PSATOLD;
+    } *psaptr = 0; /* PSA is at address 0 */
+
+    CRYPTO_THREADID_set_numeric(id, psaptr->PSATOLD);
+#else
+    CRYPTO_THREADID_set_numeric(id, (unsigned long) apr_os_thread_current());
+#endif
+}
+
+static apr_status_t ssl_util_thr_id_cleanup(void *old)
+{
+    CRYPTO_THREADID_set_callback(old);
+    return APR_SUCCESS;
+}
+
+#else
+
+static unsigned long ssl_util_thr_id(void)
+{
+    /* OpenSSL needs this to return an unsigned long.  On OS/390, the pthread
+     * id is a structure twice that big.  Use the TCB pointer instead as a
+     * unique unsigned long.
+     */
+#ifdef __MVS__
+    struct PSA {
+        char unmapped[540];
+        unsigned long PSATOLD;
+    } *psaptr = 0;
+
+    return psaptr->PSATOLD;
+#else
+    return (unsigned long) apr_os_thread_current();
+#endif
+}
+
+static apr_status_t ssl_util_thr_id_cleanup(void *old)
+{
+    CRYPTO_set_id_callback(old);
+    return APR_SUCCESS;
+}
+
+#endif
+
+static apr_status_t ssl_util_thread_cleanup(void *data)
+{
+    CRYPTO_set_locking_callback(NULL);
+
+    CRYPTO_set_dynlock_create_callback(NULL);
+    CRYPTO_set_dynlock_lock_callback(NULL);
+    CRYPTO_set_dynlock_destroy_callback(NULL);
+
+    dynlockpool = NULL;
+
+    /* Let the registered mutex cleanups do their own thing
+     */
+    return APR_SUCCESS;
+}
+
+void ssl_util_thread_setup(apr_pool_t *p)
+{
+    int i;
+
+    lock_num_locks = CRYPTO_num_locks();
+    lock_cs = apr_palloc(p, lock_num_locks * sizeof(*lock_cs));
+
+    for (i = 0; i < lock_num_locks; i++) {
+        apr_thread_mutex_create(&(lock_cs[i]), APR_THREAD_MUTEX_DEFAULT, p);
+    }
+
+    CRYPTO_set_locking_callback(ssl_util_thr_lock);
+
+    /* Set up dynamic locking scaffolding for OpenSSL to use at its
+     * convenience.
+     */
+    dynlockpool = p;
+    CRYPTO_set_dynlock_create_callback(ssl_dyn_create_function);
+    CRYPTO_set_dynlock_lock_callback(ssl_dyn_lock_function);
+    CRYPTO_set_dynlock_destroy_callback(ssl_dyn_destroy_function);
+
+    apr_pool_cleanup_register(p, NULL, ssl_util_thread_cleanup,
+                                       apr_pool_cleanup_null);
+}
+
+void ssl_util_thread_id_setup(apr_pool_t *p)
+{
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
+    CRYPTO_THREADID_set_callback(ssl_util_thr_id);
+#else
+    CRYPTO_set_id_callback(ssl_util_thr_id);
+#endif
+    apr_pool_cleanup_register(p, NULL, ssl_util_thr_id_cleanup,
+                                       apr_pool_cleanup_null);
+}
+
+#endif /* #if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API */
+
+int modssl_is_engine_id(const char *name)
+{
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    /* ### Can handle any other special ENGINE key names here? */
+    return strncmp(name, "pkcs11:", 7) == 0;
+#else
+    return 0;
+#endif
+}
diff --git a/modules/ssl/ssl_util_ocsp.c b/modules/ssl/ssl_util_ocsp.c
new file mode 100644
index 0000000..b9c8a0b
--- /dev/null
+++ b/modules/ssl/ssl_util_ocsp.c
@@ -0,0 +1,422 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This file implements an OCSP client including a toy HTTP/1.0
+ * client.  Once httpd depends on a real HTTP client library, most of
+ * this can be thrown away. */
+
+#include "ssl_private.h"
+
+#ifndef OPENSSL_NO_OCSP
+
+#include "apr_buckets.h"
+#include "apr_uri.h"
+
+/* Serialize an OCSP request which will be sent to the responder at
+ * given URI to a memory BIO object, which is returned. */
+static BIO *serialize_request(OCSP_REQUEST *req, const apr_uri_t *uri,
+                              const apr_uri_t *proxy_uri)
+{
+    BIO *bio;
+    int len;
+
+    len = i2d_OCSP_REQUEST(req, NULL);
+
+    bio = BIO_new(BIO_s_mem());
+
+    BIO_printf(bio, "POST ");
+    /* Use full URL instead of URI in case of a request through a proxy */
+    if (proxy_uri) {
+        BIO_printf(bio, "http://%s:%d",
+                   uri->hostname, uri->port);
+    }
+    BIO_printf(bio, "%s%s%s HTTP/1.0\r\n"
+               "Host: %s:%d\r\n"
+               "Content-Type: application/ocsp-request\r\n"
+               "Connection: close\r\n"
+               "Content-Length: %d\r\n"
+               "\r\n",
+               uri->path ? uri->path : "/",
+               uri->query ? "?" : "", uri->query ? uri->query : "",
+               uri->hostname, uri->port, len);
+
+    if (i2d_OCSP_REQUEST_bio(bio, req) != 1) {
+        BIO_free(bio);
+        return NULL;
+    }
+
+    return bio;
+}
+
+/* Send the OCSP request serialized into BIO 'request' to the
+ * responder at given server given by URI.  Returns socket object or
+ * NULL on error. */
+static apr_socket_t *send_request(BIO *request, const apr_uri_t *uri,
+                                  apr_interval_time_t timeout,
+                                  conn_rec *c, apr_pool_t *p,
+                                  const apr_uri_t *proxy_uri)
+{
+    apr_status_t rv;
+    apr_sockaddr_t *sa;
+    apr_socket_t *sd;
+    char buf[HUGE_STRING_LEN];
+    int len;
+    const apr_uri_t *next_hop_uri;
+
+    if (proxy_uri) {
+        next_hop_uri = proxy_uri;
+    }
+    else {
+        next_hop_uri = uri;
+    }
+
+    rv = apr_sockaddr_info_get(&sa, next_hop_uri->hostname, APR_UNSPEC,
+                               next_hop_uri->port, 0, p);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01972)
+                      "could not resolve address of %s %s",
+                      proxy_uri ? "proxy" : "OCSP responder",
+                      next_hop_uri->hostinfo);
+        return NULL;
+    }
+
+    /* establish a connection to the OCSP responder */
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01973)
+                  "connecting to %s '%s'",
+                  proxy_uri ? "proxy" : "OCSP responder",
+                  uri->hostinfo);
+
+    /* Cycle through address until a connect() succeeds. */
+    for (; sa; sa = sa->next) {
+        rv = apr_socket_create(&sd, sa->family, SOCK_STREAM, APR_PROTO_TCP, p);
+        if (rv == APR_SUCCESS) {
+            apr_socket_timeout_set(sd, timeout);
+
+            rv = apr_socket_connect(sd, sa);
+            if (rv == APR_SUCCESS) {
+                break;
+            }
+            apr_socket_close(sd);
+        }
+    }
+
+    if (sa == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01974)
+                      "could not connect to %s '%s'",
+                      proxy_uri ? "proxy" : "OCSP responder",
+                      next_hop_uri->hostinfo);
+        return NULL;
+    }
+
+    /* send the request and get a response */
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01975)
+                 "sending request to OCSP responder");
+
+    while ((len = BIO_read(request, buf, sizeof buf)) > 0) {
+        char *wbuf = buf;
+        apr_size_t remain = len;
+
+        do {
+            apr_size_t wlen = remain;
+
+            rv = apr_socket_send(sd, wbuf, &wlen);
+            wbuf += remain;
+            remain -= wlen;
+        } while (rv == APR_SUCCESS && remain > 0);
+
+        if (rv) {
+            apr_socket_close(sd);
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01976)
+                          "failed to send request to OCSP responder '%s'",
+                          uri->hostinfo);
+            return NULL;
+        }
+    }
+
+    return sd;
+}
+
+/* Return a pool-allocated NUL-terminated line, with CRLF stripped,
+ * read from brigade 'bbin' using 'bbout' as temporary storage. */
+static char *get_line(apr_bucket_brigade *bbout, apr_bucket_brigade *bbin,
+                      conn_rec *c, apr_pool_t *p)
+{
+    apr_status_t rv;
+    apr_size_t len;
+    char *line;
+
+    apr_brigade_cleanup(bbout);
+
+    rv = apr_brigade_split_line(bbout, bbin, APR_BLOCK_READ, 8192);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01977)
+                      "failed reading line from OCSP server");
+        return NULL;
+    }
+
+    rv = apr_brigade_pflatten(bbout, &line, &len, p);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01978)
+                      "failed reading line from OCSP server");
+        return NULL;
+    }
+
+    if (len == 0) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(02321)
+                      "empty response from OCSP server");
+        return NULL;
+    }
+
+    if (line[len-1] != APR_ASCII_LF) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01979)
+                      "response header line too long from OCSP server");
+        return NULL;
+    }
+
+    line[len-1] = '\0';
+    if (len > 1 && line[len-2] == APR_ASCII_CR) {
+        line[len-2] = '\0';
+    }
+
+    return line;
+}
+
+/* Maximum values to prevent eating RAM forever. */
+#define MAX_HEADERS (256)
+#define MAX_CONTENT (2048 * 1024)
+
+/* Read the OCSP response from the socket 'sd', using temporary memory
+ * BIO 'bio', and return the decoded OCSP response object, or NULL on
+ * error. */
+static OCSP_RESPONSE *read_response(apr_socket_t *sd, BIO *bio, conn_rec *c,
+                                    apr_pool_t *p)
+{
+    apr_bucket_brigade *bb, *tmpbb;
+    OCSP_RESPONSE *response;
+    char *line;
+    apr_size_t count;
+    apr_int64_t code;
+
+    /* Using brigades for response parsing is much simpler than using
+     * apr_socket_* directly. */
+    bb = apr_brigade_create(p, c->bucket_alloc);
+    tmpbb = apr_brigade_create(p, c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_socket_create(sd, c->bucket_alloc));
+
+    line = get_line(tmpbb, bb, c, p);
+    if (!line || strncmp(line, "HTTP/", 5)
+        || (line = ap_strchr(line, ' ')) == NULL
+        || (code = apr_atoi64(++line)) < 200 || code > 299) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01980)
+                      "bad response from OCSP server: %s",
+                      line ? line : "(none)");
+        return NULL;
+    }
+
+    /* Read till end of headers; don't have to even bother parsing the
+     * Content-Length since the server is obliged to close the
+     * connection after the response anyway for HTTP/1.0. */
+    count = 0;
+    while ((line = get_line(tmpbb, bb, c, p)) != NULL && line[0]
+           && ++count < MAX_HEADERS) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01981)
+                      "OCSP response header: %s", line);
+    }
+
+    if (count == MAX_HEADERS) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01982)
+                      "could not read response headers from OCSP server, "
+                      "exceeded maximum count (%u)", MAX_HEADERS);
+        return NULL;
+    }
+    else if (!line) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01983)
+                      "could not read response header from OCSP server");
+        return NULL;
+    }
+
+    /* Read the response body into the memory BIO. */
+    count = 0;
+    while (!APR_BRIGADE_EMPTY(bb)) {
+        const char *data;
+        apr_size_t len;
+        apr_status_t rv;
+        apr_bucket *e = APR_BRIGADE_FIRST(bb);
+
+        rv = apr_bucket_read(e, &data, &len, APR_BLOCK_READ);
+        if (rv == APR_EOF) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01984)
+                          "OCSP response: got EOF");
+            break;
+        }
+        if (rv != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01985)
+                          "error reading response from OCSP server");
+            return NULL;
+        }
+        if (len == 0) {
+            /* Ignore zero-length buckets (possible side-effect of
+             * line splitting). */
+            apr_bucket_delete(e);
+            continue;
+        }
+        count += len;
+        if (count > MAX_CONTENT) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01986)
+                          "OCSP response size exceeds %u byte limit",
+                          MAX_CONTENT);
+            return NULL;
+        }
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01987)
+                      "OCSP response: got %" APR_SIZE_T_FMT
+                      " bytes, %" APR_SIZE_T_FMT " total", len, count);
+
+        BIO_write(bio, data, (int)len);
+        apr_bucket_delete(e);
+    }
+
+    apr_brigade_destroy(bb);
+    apr_brigade_destroy(tmpbb);
+
+    /* Finally decode the OCSP response from what's stored in the
+     * bio. */
+    response = d2i_OCSP_RESPONSE_bio(bio, NULL);
+    if (response == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01988)
+                      "failed to decode OCSP response data");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, mySrvFromConn(c));
+    }
+
+    return response;
+}
+
+OCSP_RESPONSE *modssl_dispatch_ocsp_request(const apr_uri_t *uri,
+                                            apr_interval_time_t timeout,
+                                            OCSP_REQUEST *request,
+                                            conn_rec *c, apr_pool_t *p)
+{
+    OCSP_RESPONSE *response = NULL;
+    apr_socket_t *sd;
+    BIO *bio;
+    const apr_uri_t *proxy_uri;
+
+    proxy_uri = (mySrvConfigFromConn(c))->server->proxy_uri;
+    bio = serialize_request(request, uri, proxy_uri);
+    if (bio == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01989)
+                      "could not serialize OCSP request");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, mySrvFromConn(c));
+        return NULL;
+    }
+
+    sd = send_request(bio, uri, timeout, c, p, proxy_uri);
+    if (sd == NULL) {
+        /* Errors already logged. */
+        BIO_free(bio);
+        return NULL;
+    }
+
+    /* Clear the BIO contents, ready for the response. */
+    (void)BIO_reset(bio);
+
+    response = read_response(sd, bio, c, p);
+
+    apr_socket_close(sd);
+    BIO_free(bio);
+
+    return response;
+}
+
+/*  _________________________________________________________________
+**
+**  OCSP other certificate support
+**  _________________________________________________________________
+*/
+
+/*
+ * Read a file that contains certificates in PEM format and
+ * return as a STACK.
+ */
+
+static STACK_OF(X509) *modssl_read_ocsp_certificates(const char *file)
+{
+    BIO *bio;
+    X509 *x509;
+    unsigned long err;
+    STACK_OF(X509) *other_certs = NULL;
+
+    if ((bio = BIO_new(BIO_s_file())) == NULL)
+        return NULL;
+    if (BIO_read_filename(bio, file) <= 0) {
+        BIO_free(bio);
+        return NULL;
+    }
+
+    /* create new extra chain by loading the certs */
+    ERR_clear_error();
+    while ((x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL)) != NULL) {
+        if (!other_certs) {
+                other_certs = sk_X509_new_null();
+                if (!other_certs)
+                        return NULL;
+        }
+                
+        if (!sk_X509_push(other_certs, x509)) {
+            X509_free(x509);
+            sk_X509_pop_free(other_certs, X509_free);
+            BIO_free(bio);
+            return NULL;
+        }
+    }
+    /* Make sure that only the error is just an EOF */
+    if ((err = ERR_peek_error()) > 0) {
+        if (!(   ERR_GET_LIB(err) == ERR_LIB_PEM
+              && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
+            BIO_free(bio);
+            sk_X509_pop_free(other_certs, X509_free);
+            return NULL;
+        }
+        while (ERR_get_error() > 0) ;
+    }
+    BIO_free(bio);
+    return other_certs;
+}
+
+void ssl_init_ocsp_certificates(server_rec *s, modssl_ctx_t *mctx)
+{
+    /*
+     * Configure Trusted OCSP certificates.
+     */
+
+    if (!mctx->ocsp_certs_file) {
+        return;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
+                 "Configuring Trusted OCSP certificates");
+
+    mctx->ocsp_certs = modssl_read_ocsp_certificates(mctx->ocsp_certs_file);
+
+    if (!mctx->ocsp_certs) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
+                "Unable to configure OCSP Trusted Certificates");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+        ssl_die(s);
+    }
+    mctx->ocsp_verify_flags |= OCSP_TRUSTOTHER;
+}
+
+#endif /* HAVE_OCSP */
diff --git a/modules/ssl/ssl_util_ssl.c b/modules/ssl/ssl_util_ssl.c
new file mode 100644
index 0000000..38079a9
--- /dev/null
+++ b/modules/ssl/ssl_util_ssl.c
@@ -0,0 +1,591 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_util_ssl.c
+ *  Additional Utility Functions for OpenSSL
+ */
+
+#include "ssl_private.h"
+
+/*  _________________________________________________________________
+**
+**  Additional High-Level Functions for OpenSSL
+**  _________________________________________________________________
+*/
+
+/* we initialize this index at startup time
+ * and never write to it at request time,
+ * so this static is thread safe.
+ * also note that OpenSSL increments at static variable when
+ * SSL_get_ex_new_index() is called, so we _must_ do this at startup.
+ */
+static int app_data2_idx = -1;
+
+void modssl_init_app_data2_idx(void)
+{
+    int i;
+
+    if (app_data2_idx > -1) {
+        return;
+    }
+
+    /* we _do_ need to call this twice */
+    for (i = 0; i <= 1; i++) {
+        app_data2_idx =
+            SSL_get_ex_new_index(0,
+                                 "Second Application Data for SSL",
+                                 NULL, NULL, NULL);
+    }
+}
+
+void *modssl_get_app_data2(SSL *ssl)
+{
+    return (void *)SSL_get_ex_data(ssl, app_data2_idx);
+}
+
+void modssl_set_app_data2(SSL *ssl, void *arg)
+{
+    SSL_set_ex_data(ssl, app_data2_idx, (char *)arg);
+    return;
+}
+
+/*  _________________________________________________________________
+**
+**  High-Level Private Key Loading
+**  _________________________________________________________________
+*/
+
+EVP_PKEY *modssl_read_privatekey(const char *filename, pem_password_cb *cb, void *s)
+{
+    EVP_PKEY *rc;
+    BIO *bioS;
+    BIO *bioF;
+
+    /* 1. try PEM (= DER+Base64+headers) */
+    if ((bioS=BIO_new_file(filename, "r")) == NULL)
+        return NULL;
+    rc = PEM_read_bio_PrivateKey(bioS, NULL, cb, s);
+    BIO_free(bioS);
+
+    if (rc == NULL) {
+        /* 2. try DER+Base64 */
+        if ((bioS = BIO_new_file(filename, "r")) == NULL)
+            return NULL;
+
+        if ((bioF = BIO_new(BIO_f_base64())) == NULL) {
+            BIO_free(bioS);
+            return NULL;
+        }
+        bioS = BIO_push(bioF, bioS);
+        rc = d2i_PrivateKey_bio(bioS, NULL);
+        BIO_free_all(bioS);
+
+        if (rc == NULL) {
+            /* 3. try plain DER */
+            if ((bioS = BIO_new_file(filename, "r")) == NULL)
+                return NULL;
+            rc = d2i_PrivateKey_bio(bioS, NULL);
+            BIO_free(bioS);
+        }
+    }
+    return rc;
+}
+
+/*  _________________________________________________________________
+**
+**  Smart shutdown
+**  _________________________________________________________________
+*/
+
+int modssl_smart_shutdown(SSL *ssl)
+{
+    int i;
+    int rc;
+    int flush;
+
+    /*
+     * Repeat the calls, because SSL_shutdown internally dispatches through a
+     * little state machine. Usually only one or two iterations should be
+     * needed, so we restrict the total number of restrictions in order to
+     * avoid process hangs in case the client played bad with the socket
+     * connection and OpenSSL cannot recognize it.
+     */
+    rc = 0;
+    flush = !(SSL_get_shutdown(ssl) & SSL_SENT_SHUTDOWN);
+    for (i = 0; i < 4 /* max 2x pending + 2x data = 4 */; i++) {
+        rc = SSL_shutdown(ssl);
+        if (rc >= 0 && flush && (SSL_get_shutdown(ssl) & SSL_SENT_SHUTDOWN)) {
+            /* Once the close notify is sent through the output filters,
+             * ensure it is flushed through the socket.
+             */
+            if (BIO_flush(SSL_get_wbio(ssl)) <= 0) {
+                rc = -1;
+                break;
+            }
+            flush = 0;
+        }
+        if (rc != 0)
+            break;
+    }
+    return rc;
+}
+
+/*  _________________________________________________________________
+**
+**  Certificate Checks
+**  _________________________________________________________________
+*/
+
+/* retrieve basic constraints ingredients */
+BOOL modssl_X509_getBC(X509 *cert, int *ca, int *pathlen)
+{
+    BASIC_CONSTRAINTS *bc;
+    BIGNUM *bn = NULL;
+    char *cp;
+
+    bc = X509_get_ext_d2i(cert, NID_basic_constraints, NULL, NULL);
+    if (bc == NULL)
+        return FALSE;
+    *ca = bc->ca;
+    *pathlen = -1 /* unlimited */;
+    if (bc->pathlen != NULL) {
+        if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL) {
+            BASIC_CONSTRAINTS_free(bc);
+            return FALSE;
+        }
+        if ((cp = BN_bn2dec(bn)) == NULL) {
+            BN_free(bn);
+            BASIC_CONSTRAINTS_free(bc);
+            return FALSE;
+        }
+        *pathlen = atoi(cp);
+        OPENSSL_free(cp);
+        BN_free(bn);
+    }
+    BASIC_CONSTRAINTS_free(bc);
+    return TRUE;
+}
+
+char *modssl_bio_free_read(apr_pool_t *p, BIO *bio)
+{
+    int len = BIO_pending(bio);
+    char *result = NULL;
+
+    if (len > 0) {
+        result = apr_palloc(p, len+1);
+        len = BIO_read(bio, result, len);
+        result[len] = NUL;
+    }
+    BIO_free(bio);
+    return result;
+}
+
+/* Convert ASN.1 string to a pool-allocated char * string, escaping
+ * control characters.  If raw is zero, convert to UTF-8, otherwise
+ * unchanged from the character set. */
+static char *asn1_string_convert(apr_pool_t *p, ASN1_STRING *asn1str, int raw)
+{
+    BIO *bio;
+    int flags = ASN1_STRFLGS_ESC_CTRL;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL)
+        return NULL;
+
+    if (!raw) flags |= ASN1_STRFLGS_UTF8_CONVERT;
+    
+    ASN1_STRING_print_ex(bio, asn1str, flags);
+
+    return modssl_bio_free_read(p, bio);
+}
+
+#define asn1_string_to_utf8(p, a) asn1_string_convert(p, a, 0)
+
+/* convert a NAME_ENTRY to UTF8 string */
+char *modssl_X509_NAME_ENTRY_to_string(apr_pool_t *p, X509_NAME_ENTRY *xsne,
+                                       int raw)
+{
+    char *result = asn1_string_convert(p, X509_NAME_ENTRY_get_data(xsne), raw);
+    ap_xlate_proto_from_ascii(result, len);
+    return result;
+}
+
+/*
+ * convert an X509_NAME to an RFC 2253 formatted string, optionally truncated
+ * to maxlen characters (specify a maxlen of 0 for no length limit)
+ */
+char *modssl_X509_NAME_to_string(apr_pool_t *p, X509_NAME *dn, int maxlen)
+{
+    char *result = NULL;
+    BIO *bio;
+    int len;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL)
+        return NULL;
+    X509_NAME_print_ex(bio, dn, 0, XN_FLAG_RFC2253);
+    len = BIO_pending(bio);
+    if (len > 0) {
+        result = apr_palloc(p, (maxlen > 0) ? maxlen+1 : len+1);
+        if (maxlen > 0 && maxlen < len) {
+            len = BIO_read(bio, result, maxlen);
+            if (maxlen > 2) {
+                /* insert trailing ellipsis if there's enough space */
+                apr_snprintf(result + maxlen - 3, 4, "...");
+            }
+        } else {
+            len = BIO_read(bio, result, len);
+        }
+        result[len] = NUL;
+    }
+    BIO_free(bio);
+
+    return result;
+}
+
+static void parse_otherName_value(apr_pool_t *p, ASN1_TYPE *value,
+                                  const char *onf, apr_array_header_t **entries)
+{
+    const char *str;
+    int nid = onf ? OBJ_txt2nid(onf) : NID_undef;
+
+    if (!value || (nid == NID_undef) || !*entries)
+       return;
+
+    /* 
+     * Currently supported otherName forms (values for "onf"):
+     * "msUPN" (1.3.6.1.4.1.311.20.2.3): Microsoft User Principal Name
+     * "id-on-dnsSRV" (1.3.6.1.5.5.7.8.7): SRVName, as specified in RFC 4985
+     */
+    if ((nid == NID_ms_upn) && (value->type == V_ASN1_UTF8STRING) &&
+        (str = asn1_string_to_utf8(p, value->value.utf8string))) {
+        APR_ARRAY_PUSH(*entries, const char *) = str;
+    } else if (strEQ(onf, "id-on-dnsSRV") &&
+               (value->type == V_ASN1_IA5STRING) &&
+               (str = asn1_string_to_utf8(p, value->value.ia5string))) {
+        APR_ARRAY_PUSH(*entries, const char *) = str;
+    }
+}
+
+/* 
+ * Return an array of subjectAltName entries of type "type". If idx is -1,
+ * return all entries of the given type, otherwise return an array consisting
+ * of the n-th occurrence of that type only. Currently supported types:
+ * GEN_EMAIL (rfc822Name)
+ * GEN_DNS (dNSName)
+ * GEN_OTHERNAME (requires the otherName form ["onf"] argument to be supplied,
+ *                see parse_otherName_value for the currently supported forms)
+ */
+BOOL modssl_X509_getSAN(apr_pool_t *p, X509 *x509, int type, const char *onf,
+                        int idx, apr_array_header_t **entries)
+{
+    STACK_OF(GENERAL_NAME) *names;
+    int nid = onf ? OBJ_txt2nid(onf) : NID_undef;
+
+    if (!x509 || (type < GEN_OTHERNAME) ||
+        ((type == GEN_OTHERNAME) && (nid == NID_undef)) ||
+        (type > GEN_RID) || (idx < -1) ||
+        !(*entries = apr_array_make(p, 0, sizeof(char *)))) {
+        *entries = NULL;
+        return FALSE;
+    }
+
+    if ((names = X509_get_ext_d2i(x509, NID_subject_alt_name, NULL, NULL))) {
+        int i, n = 0;
+        GENERAL_NAME *name;
+        const char *utf8str;
+
+        for (i = 0; i < sk_GENERAL_NAME_num(names); i++) {
+            name = sk_GENERAL_NAME_value(names, i);
+
+            if (name->type != type)
+                continue;
+
+            switch (type) {
+            case GEN_EMAIL:
+            case GEN_DNS:
+                if (((idx == -1) || (n == idx)) &&
+                    (utf8str = asn1_string_to_utf8(p, name->d.ia5))) {
+                    APR_ARRAY_PUSH(*entries, const char *) = utf8str;
+                }
+                n++;
+                break;
+            case GEN_OTHERNAME:
+                if (OBJ_obj2nid(name->d.otherName->type_id) == nid) {
+                    if (((idx == -1) || (n == idx))) {
+                        parse_otherName_value(p, name->d.otherName->value,
+                                              onf, entries);
+                    }
+                    n++;
+                }
+                break;
+            default:
+                /*
+                 * Not implemented right now:
+                 * GEN_X400 (x400Address)
+                 * GEN_DIRNAME (directoryName)
+                 * GEN_EDIPARTY (ediPartyName)
+                 * GEN_URI (uniformResourceIdentifier)
+                 * GEN_IPADD (iPAddress)
+                 * GEN_RID (registeredID)
+                 */
+                break;
+            }
+
+            if ((idx != -1) && (n > idx))
+               break;
+        }
+
+        sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
+    }
+
+    return apr_is_empty_array(*entries) ? FALSE : TRUE;
+}
+
+/* return an array of (RFC 6125 coined) DNS-IDs and CN-IDs in a certificate */
+static BOOL getIDs(apr_pool_t *p, X509 *x509, apr_array_header_t **ids)
+{
+    X509_NAME *subj;
+    int i = -1;
+
+    /* First, the DNS-IDs (dNSName entries in the subjectAltName extension) */
+    if (!x509 ||
+        (modssl_X509_getSAN(p, x509, GEN_DNS, NULL, -1, ids) == FALSE && !*ids)) {
+        *ids = NULL;
+        return FALSE;
+    }
+
+    /* Second, the CN-IDs (commonName attributes in the subject DN) */
+    subj = X509_get_subject_name(x509);
+    while ((i = X509_NAME_get_index_by_NID(subj, NID_commonName, i)) != -1) {
+        APR_ARRAY_PUSH(*ids, const char *) = 
+            modssl_X509_NAME_ENTRY_to_string(p, X509_NAME_get_entry(subj, i), 0);
+    }
+
+    return apr_is_empty_array(*ids) ? FALSE : TRUE;
+}
+
+/* 
+ * Check if a certificate matches for a particular name, by iterating over its
+ * DNS-IDs and CN-IDs (RFC 6125), optionally with basic wildcard matching.
+ * If server_rec is non-NULL, some (debug/trace) logging is enabled.
+ */
+BOOL modssl_X509_match_name(apr_pool_t *p, X509 *x509, const char *name,
+                            BOOL allow_wildcard, server_rec *s)
+{
+    BOOL matched = FALSE;
+    apr_array_header_t *ids;
+
+    /*
+     * At some day in the future, this might be replaced with X509_check_host()
+     * (available in OpenSSL 1.0.2 and later), but two points should be noted:
+     * 1) wildcard matching in X509_check_host() might yield different
+     *    results (by default, it supports a broader set of patterns, e.g.
+     *    wildcards in non-initial positions);
+     * 2) we lose the option of logging each DNS- and CN-ID (until a match
+     *    is found).
+     */
+
+    if (getIDs(p, x509, &ids)) {
+        const char *cp;
+        int i;
+        char **id = (char **)ids->elts;
+        BOOL is_wildcard;
+
+        for (i = 0; i < ids->nelts; i++) {
+            if (!id[i])
+                continue;
+
+            /*
+             * Determine if it is a wildcard ID - we're restrictive
+             * in the sense that we require the wildcard character to be
+             * THE left-most label (i.e., the ID must start with "*.")
+             */
+            is_wildcard = (*id[i] == '*' && *(id[i]+1) == '.') ? TRUE : FALSE;
+
+            /*
+             * If the ID includes a wildcard character (and the caller is
+             * allowing wildcards), check if it matches for the left-most
+             * DNS label - i.e., the wildcard character is not allowed
+             * to match a dot. Otherwise, try a simple string compare.
+             */
+            if ((allow_wildcard == TRUE && is_wildcard == TRUE &&
+                 (cp = ap_strchr_c(name, '.')) && !strcasecmp(id[i]+1, cp)) ||
+                !strcasecmp(id[i], name)) {
+                matched = TRUE;
+            }
+
+            if (s) {
+                ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
+                             "[%s] modssl_X509_match_name: expecting name '%s', "
+                             "%smatched by ID '%s'",
+                             (mySrvConfig(s))->vhost_id, name,
+                             matched == TRUE ? "" : "NOT ", id[i]);
+            }
+
+            if (matched == TRUE) {
+                break;
+            }
+        }
+
+    }
+
+    if (s) {
+        ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, p, s, x509,
+                       APLOGNO(02412) "[%s] Cert %s for name '%s'",
+                       (mySrvConfig(s))->vhost_id,
+                       matched == TRUE ? "matches" : "does not match",
+                       name);
+    }
+
+    return matched;
+}
+
+/*  _________________________________________________________________
+**
+**  Custom (EC)DH parameter support
+**  _________________________________________________________________
+*/
+
+DH *ssl_dh_GetParamFromFile(const char *file)
+{
+    DH *dh = NULL;
+    BIO *bio;
+
+    if ((bio = BIO_new_file(file, "r")) == NULL)
+        return NULL;
+    dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
+    BIO_free(bio);
+    return (dh);
+}
+
+#ifdef HAVE_ECC
+EC_GROUP *ssl_ec_GetParamFromFile(const char *file)
+{
+    EC_GROUP *group = NULL;
+    BIO *bio;
+
+    if ((bio = BIO_new_file(file, "r")) == NULL)
+        return NULL;
+    group = PEM_read_bio_ECPKParameters(bio, NULL, NULL, NULL);
+    BIO_free(bio);
+    return (group);
+}
+#endif
+
+/*  _________________________________________________________________
+**
+**  Session Stuff
+**  _________________________________________________________________
+*/
+
+char *modssl_SSL_SESSION_id2sz(IDCONST unsigned char *id, int idlen,
+                               char *str, int strsize)
+{
+    if (idlen > SSL_MAX_SSL_SESSION_ID_LENGTH)
+        idlen = SSL_MAX_SSL_SESSION_ID_LENGTH;
+        
+    /* We must ensure not to process more than what would fit in the
+     * destination buffer, including terminating NULL */
+    if (idlen > (strsize-1) / 2)
+        idlen = (strsize-1) / 2;
+
+    ap_bin2hex(id, idlen, str);
+
+    return str;
+}
+
+/*  _________________________________________________________________
+**
+**  Certificate/Key Stuff
+**  _________________________________________________________________
+*/
+
+apr_status_t modssl_read_cert(apr_pool_t *p, 
+                              const char *cert_pem, const char *key_pem,
+                              pem_password_cb *cb, void *ud,
+                              X509 **pcert, EVP_PKEY **pkey)
+{
+    BIO *in;
+    X509 *x = NULL;
+    EVP_PKEY *key = NULL;
+    apr_status_t rv = APR_SUCCESS;
+
+    in = BIO_new_mem_buf(cert_pem, -1);
+    if (in == NULL) {
+        rv = APR_ENOMEM;
+        goto cleanup;
+    }
+    
+    x = PEM_read_bio_X509(in, NULL, cb, ud);
+    if (x == NULL) {
+        rv = APR_ENOENT;
+        goto cleanup;
+    }
+    
+    BIO_free(in);
+    in = BIO_new_mem_buf(key_pem? key_pem : cert_pem, -1);
+    if (in == NULL) {
+        rv = APR_ENOMEM;
+        goto cleanup;
+    }
+    key = PEM_read_bio_PrivateKey(in, NULL, cb, ud);
+    if (key == NULL) {
+        rv = APR_ENOENT;
+        goto cleanup;
+    }
+    
+cleanup:
+    if (rv == APR_SUCCESS) {
+        *pcert = x;
+        *pkey = key;
+    }
+    else {
+        *pcert = NULL;
+        *pkey = NULL;
+        if (x) X509_free(x);
+        if (key) EVP_PKEY_free(key);
+    }
+    if (in != NULL) BIO_free(in);
+    return rv;
+}
+
+apr_status_t modssl_cert_get_pem(apr_pool_t *p,
+                                 X509 *cert1, X509 *cert2,
+                                 const char **ppem)
+{
+    apr_status_t rv = APR_ENOMEM;
+    BIO *bio;
+
+    if ((bio = BIO_new(BIO_s_mem())) == NULL) goto cleanup;
+    if (PEM_write_bio_X509(bio, cert1) != 1) goto cleanup;
+    if (cert2 && PEM_write_bio_X509(bio, cert2) != 1) goto cleanup;
+    rv = APR_SUCCESS;
+
+cleanup:
+    if (rv != APR_SUCCESS) {
+        *ppem = NULL;
+        if (bio) BIO_free(bio);
+    }
+    else {
+        *ppem = modssl_bio_free_read(p, bio);
+    }
+    return rv;
+}
diff --git a/modules/ssl/ssl_util_ssl.h b/modules/ssl/ssl_util_ssl.h
new file mode 100644
index 0000000..443c1b7
--- /dev/null
+++ b/modules/ssl/ssl_util_ssl.h
@@ -0,0 +1,107 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @verbatim
+                        _             _
+    _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+   | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+   | | | | | | (_) | (_| |   \__ \__ \ |
+   |_| |_| |_|\___/ \__,_|___|___/___/_|
+                        |_____|
+   @endverbatim
+ * @file  ssl_util_ssl.h
+ * @brief Additional Utility Functions for OpenSSL
+ *
+ * @defgroup MOD_SSL_UTIL Utilities
+ * @ingroup MOD_SSL
+ * @{
+ */
+
+#ifndef __SSL_UTIL_SSL_H__
+#define __SSL_UTIL_SSL_H__
+
+/**
+ * SSL library version number
+ */
+
+#define MODSSL_LIBRARY_VERSION OPENSSL_VERSION_NUMBER
+#define MODSSL_LIBRARY_NAME    "OpenSSL"
+#define MODSSL_LIBRARY_TEXT    OPENSSL_VERSION_TEXT
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define MODSSL_LIBRARY_DYNTEXT SSLeay_version(SSLEAY_VERSION)
+#else
+#define MODSSL_LIBRARY_DYNTEXT OpenSSL_version(OPENSSL_VERSION)
+#endif
+
+/**
+ *  Maximum length of a DER encoded session.
+ *  FIXME: There is no define in OpenSSL, but OpenSSL uses 1024*10,
+ *         so this value should be ok. Although we have no warm feeling.
+ */
+#define MODSSL_SESSION_MAX_DER 1024*10
+
+/** max length for modssl_SSL_SESSION_id2sz */
+#define MODSSL_SESSION_ID_STRING_LEN \
+    ((SSL_MAX_SSL_SESSION_ID_LENGTH + 1) * 2)
+
+/**
+ *  Additional Functions
+ */
+void        modssl_init_app_data2_idx(void);
+void       *modssl_get_app_data2(SSL *);
+void        modssl_set_app_data2(SSL *, void *);
+
+/* Read private key from filename in either PEM or raw base64(DER)
+ * format, using password entry callback cb and userdata. */
+EVP_PKEY   *modssl_read_privatekey(const char *filename, pem_password_cb *cb, void *ud);
+
+int         modssl_smart_shutdown(SSL *ssl);
+BOOL        modssl_X509_getBC(X509 *, int *, int *);
+char       *modssl_X509_NAME_ENTRY_to_string(apr_pool_t *p, X509_NAME_ENTRY *xsne,
+                                             int raw);
+char       *modssl_X509_NAME_to_string(apr_pool_t *, X509_NAME *, int);
+BOOL        modssl_X509_getSAN(apr_pool_t *, X509 *, int, const char *, int, apr_array_header_t **);
+BOOL        modssl_X509_match_name(apr_pool_t *, X509 *, const char *, BOOL, server_rec *);
+char       *modssl_SSL_SESSION_id2sz(IDCONST unsigned char *, int, char *, int);
+
+/* Reads the remaining data in BIO, if not empty, and copies it into a
+ * pool-allocated string.  If empty, returns NULL.  BIO_free(bio) is
+ * called for both cases. */
+char *modssl_bio_free_read(apr_pool_t *p, BIO *bio);
+
+/* Read a single certificate and its private key from the given string in PEM format.
+ * If `key_pem` is NULL, it will expect the key in `cert_pem`.
+ */
+apr_status_t modssl_read_cert(apr_pool_t *p, 
+                              const char *cert_pem, const char *key_pem,
+                              pem_password_cb *cb, void *ud, 
+                              X509 **pcert, EVP_PKEY **pkey);
+
+/* Convert a certificate (and optionally a second) into a PEM string.
+ * @param p pool for allocations
+ * @param cert1 the certificate to convert
+ * @param cert2 a second cert to add to the PEM afterwards or NULL.
+ * @param ppem the certificate(s) in PEM format, NUL-terminated.
+ * @return APR_SUCCESS if ppem is valid.
+ */
+apr_status_t modssl_cert_get_pem(apr_pool_t *p,
+                                 X509 *cert1, X509 *cert2,
+                                 const char **ppem);
+
+#endif /* __SSL_UTIL_SSL_H__ */
+/** @} */
+
diff --git a/modules/ssl/ssl_util_stapling.c b/modules/ssl/ssl_util_stapling.c
new file mode 100644
index 0000000..ab77e4a
--- /dev/null
+++ b/modules/ssl/ssl_util_stapling.c
@@ -0,0 +1,975 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                      _             _
+ *  _ __ ___   ___   __| |    ___ ___| |  mod_ssl
+ * | '_ ` _ \ / _ \ / _` |   / __/ __| |  Apache Interface to OpenSSL
+ * | | | | | | (_) | (_| |   \__ \__ \ |
+ * |_| |_| |_|\___/ \__,_|___|___/___/_|
+ *                      |_____|
+ *  ssl_stapling.c
+ *  OCSP Stapling Support
+ */
+                             /* ``Where's the spoons?
+                                  Where's the spoons?
+                                  Where's the bloody spoons?''
+                                            -- Alexei Sayle          */
+
+#include "ssl_private.h"
+#include "ap_mpm.h"
+#include "apr_thread_mutex.h"
+#include "mod_ssl_openssl.h"
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, init_stapling_status,
+                                    (server_rec *s, apr_pool_t *p, 
+                                     X509 *cert, X509 *issuer),
+                                     (s, p, cert, issuer),
+                                    DECLINED, DECLINED)
+
+APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, get_stapling_status,
+                                    (unsigned char **pder, int *pderlen, 
+                                     conn_rec *c, server_rec *s, X509 *cert),
+                                     (pder, pderlen, c, s, cert), 
+                                    DECLINED, DECLINED)
+                         
+
+#ifdef HAVE_OCSP_STAPLING
+
+static int stapling_cache_mutex_on(server_rec *s);
+static int stapling_cache_mutex_off(server_rec *s);
+
+static int stapling_cb(SSL *ssl, void *arg);
+
+/**
+ * Maximum OCSP stapling response size. This should be the response for a
+ * single certificate and will typically include the responder certificate chain
+ * so 10K should be more than enough.
+ *
+ */
+
+#define MAX_STAPLING_DER 10240
+
+/* Cached info stored in the global stapling_certinfo hash. */
+typedef struct {
+    /* Index in session cache (SHA-1 digest of DER encoded certificate) */
+    UCHAR idx[SHA_DIGEST_LENGTH];
+    /* Certificate ID for OCSP request */
+    OCSP_CERTID *cid;
+    /* URI of the OCSP responder */
+    char *uri;
+} certinfo;
+
+static apr_status_t ssl_stapling_certid_free(void *data)
+{
+    OCSP_CERTID *cid = data;
+
+    if (cid) {
+        OCSP_CERTID_free(cid);
+    }
+
+    return APR_SUCCESS;
+}
+
+static apr_hash_t *stapling_certinfo;
+
+void ssl_stapling_certinfo_hash_init(apr_pool_t *p)
+{
+    stapling_certinfo = apr_hash_make(p);
+}
+
+static X509 *stapling_get_issuer(modssl_ctx_t *mctx, X509 *x)
+{
+    X509 *issuer = NULL;
+    int i;
+    X509_STORE *st = SSL_CTX_get_cert_store(mctx->ssl_ctx);
+    X509_STORE_CTX *inctx;
+    STACK_OF(X509) *extra_certs = NULL;
+
+#ifdef OPENSSL_NO_SSL_INTERN
+    SSL_CTX_get_extra_chain_certs(mctx->ssl_ctx, &extra_certs);
+#else
+    extra_certs = mctx->ssl_ctx->extra_certs;
+#endif
+
+    for (i = 0; i < sk_X509_num(extra_certs); i++) {
+        issuer = sk_X509_value(extra_certs, i);
+        if (X509_check_issued(issuer, x) == X509_V_OK) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+            CRYPTO_add(&issuer->references, 1, CRYPTO_LOCK_X509);
+#else
+            X509_up_ref(issuer);
+#endif
+            return issuer;
+        }
+    }
+
+    inctx = X509_STORE_CTX_new();
+    if (!X509_STORE_CTX_init(inctx, st, NULL, NULL))
+        return 0;
+    if (X509_STORE_CTX_get1_issuer(&issuer, inctx, x) <= 0)
+        issuer = NULL;
+    X509_STORE_CTX_cleanup(inctx);
+    X509_STORE_CTX_free(inctx);
+    return issuer;
+}
+
+int ssl_stapling_init_cert(server_rec *s, apr_pool_t *p, apr_pool_t *ptemp,
+                           modssl_ctx_t *mctx, X509 *x)
+{
+    UCHAR idx[SHA_DIGEST_LENGTH];
+    certinfo *cinf = NULL;
+    X509 *issuer = NULL;
+    OCSP_CERTID *cid = NULL;
+    STACK_OF(OPENSSL_STRING) *aia = NULL;
+    const char *pem = NULL;
+    int rv = 1; /* until further notice */
+
+    if (x == NULL)
+        return 0;
+
+    if (!(issuer = stapling_get_issuer(mctx, x))) {
+        /* In Apache pre 2.4.40, we use to come here only when mod_ssl stapling
+         * was enabled. With the new hooks, we give other modules the chance
+         * to provide stapling status. However, we do not want to log ssl errors
+         * where we did not do so in the past. */
+        if (mctx->stapling_enabled == TRUE) {
+            ssl_log_xerror(SSLLOG_MARK, APLOG_ERR, 0, ptemp, s, x, APLOGNO(02217)
+                           "ssl_stapling_init_cert: can't retrieve issuer "
+                           "certificate!");
+            return 0;
+        }
+        return 1;
+    }
+
+    if (X509_digest(x, EVP_sha1(), idx, NULL) != 1) {
+        rv = 0;
+        goto cleanup;
+    }
+
+    if (modssl_cert_get_pem(ptemp, x, issuer, &pem) != APR_SUCCESS) {
+        rv = 0;
+        goto cleanup;
+    }
+
+    if (ap_ssl_ocsp_prime(s, p, (const char*)idx, sizeof(idx), pem) == APR_SUCCESS
+        || ssl_run_init_stapling_status(s, p, x, issuer) == OK) {
+        /* Someone's taken over or mod_ssl's own implementation is not enabled */
+        if (mctx->stapling_enabled != TRUE) {
+            SSL_CTX_set_tlsext_status_cb(mctx->ssl_ctx, stapling_cb);
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(10177) "OCSP stapling added via hook");
+        }
+        goto cleanup;
+    }
+    
+    if (mctx->stapling_enabled != TRUE) {
+        /* mod_ssl's own implementation is not enabled */
+        goto cleanup;
+    }
+    
+    cinf = apr_hash_get(stapling_certinfo, idx, sizeof(idx));
+    if (cinf) {
+        /* 
+         * We already parsed the certificate, and no OCSP URI was found.
+         * The certificate might be used for multiple vhosts, though,
+         * so we check for a ForceURL for this vhost.
+         */
+        if (!cinf->uri && !mctx->stapling_force_url) {
+            ssl_log_xerror(SSLLOG_MARK, APLOG_ERR, 0, ptemp, s, x,
+                           APLOGNO(02814) "ssl_stapling_init_cert: no OCSP URI "
+                           "in certificate and no SSLStaplingForceURL "
+                           "configured for server %s", mctx->sc->vhost_id);
+            rv = 0;
+        }
+        goto cleanup;
+    }
+
+    cid = OCSP_cert_to_id(NULL, x, issuer);
+    if (!cid) {
+        ssl_log_xerror(SSLLOG_MARK, APLOG_ERR, 0, ptemp, s, x, APLOGNO(02815)
+                       "ssl_stapling_init_cert: can't create CertID "
+                       "for OCSP request");
+        rv = 0;
+        goto cleanup;
+    }
+
+    aia = X509_get1_ocsp(x);
+    if (!aia && !mctx->stapling_force_url) {
+        OCSP_CERTID_free(cid);
+        ssl_log_xerror(SSLLOG_MARK, APLOG_ERR, 0, ptemp, s, x,
+                       APLOGNO(02218) "ssl_stapling_init_cert: no OCSP URI "
+                       "in certificate and no SSLStaplingForceURL set");
+        rv = 0;
+        goto cleanup;
+    }
+
+    /* At this point, we have determined that there's something to store */
+    cinf = apr_pcalloc(p, sizeof(certinfo));
+    memcpy (cinf->idx, idx, sizeof(idx));
+    cinf->cid = cid;
+    /* make sure cid is also freed at pool cleanup */
+    apr_pool_cleanup_register(p, cid, ssl_stapling_certid_free,
+                              apr_pool_cleanup_null);
+    if (aia) {
+       /* allocate uri from the pconf pool */
+       cinf->uri = apr_pstrdup(p, sk_OPENSSL_STRING_value(aia, 0));
+       X509_email_free(aia);
+    }
+
+    ssl_log_xerror(SSLLOG_MARK, APLOG_TRACE1, 0, ptemp, s, x,
+                   "ssl_stapling_init_cert: storing certinfo for server %s",
+                   mctx->sc->vhost_id);
+
+    apr_hash_set(stapling_certinfo, cinf->idx, sizeof(cinf->idx), cinf);
+
+cleanup:
+    X509_free(issuer);
+    return rv;
+}
+
+static certinfo *stapling_get_certinfo(server_rec *s, UCHAR *idx, apr_size_t idx_len,
+                                       modssl_ctx_t *mctx, SSL *ssl)
+{
+    certinfo *cinf;
+    cinf = apr_hash_get(stapling_certinfo, idx, idx_len);
+    if (cinf && cinf->cid)
+        return cinf;
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01926)
+                 "stapling_get_certinfo: stapling not supported for certificate");
+    return NULL;
+}
+
+/*
+ * OCSP response caching code. The response is preceded by a flag value
+ * which indicates whether the response was invalid when it was stored.
+ * the purpose of this flag is to avoid repeated queries to a server
+ * which has given an invalid response while allowing a response which
+ * has subsequently become invalid to be retried immediately.
+ *
+ * The key for the cache is the hash of the certificate the response
+ * is for.
+ */
+static BOOL stapling_cache_response(server_rec *s, modssl_ctx_t *mctx,
+                                    OCSP_RESPONSE *rsp, certinfo *cinf,
+                                    BOOL ok, apr_pool_t *pool)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    unsigned char resp_der[MAX_STAPLING_DER]; /* includes one-byte flag + response */
+    unsigned char *p;
+    int resp_derlen, stored_len;
+    BOOL rv;
+    apr_time_t expiry;
+
+    resp_derlen = i2d_OCSP_RESPONSE(rsp, NULL);
+
+    if (resp_derlen <= 0) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01927)
+                     "OCSP stapling response encode error??");
+        return FALSE;
+    }
+
+    stored_len = resp_derlen + 1; /* response + ok flag */
+    if (stored_len > sizeof resp_der) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01928)
+                     "OCSP stapling response too big (%u bytes)", resp_derlen);
+        return FALSE;
+    }
+
+    p = resp_der;
+
+    /* TODO: potential optimization; _timeout members as apr_interval_time_t */
+    if (ok == TRUE) {
+        *p++ = 1;
+        expiry = apr_time_from_sec(mctx->stapling_cache_timeout);
+    }
+    else {
+        *p++ = 0;
+        expiry = apr_time_from_sec(mctx->stapling_errcache_timeout);
+    }
+
+    expiry += apr_time_now();
+
+    i2d_OCSP_RESPONSE(rsp, &p);
+
+    if (mc->stapling_cache->flags & AP_SOCACHE_FLAG_NOTMPSAFE)
+        stapling_cache_mutex_on(s);
+    rv = mc->stapling_cache->store(mc->stapling_cache_context, s,
+                                   cinf->idx, sizeof(cinf->idx),
+                                   expiry, resp_der, stored_len, pool);
+    if (mc->stapling_cache->flags & AP_SOCACHE_FLAG_NOTMPSAFE)
+        stapling_cache_mutex_off(s);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01929)
+                     "stapling_cache_response: OCSP response session store error!");
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static void stapling_get_cached_response(server_rec *s, OCSP_RESPONSE **prsp,
+                                         BOOL *pok, certinfo *cinf,
+                                         apr_pool_t *pool)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    apr_status_t rv;
+    OCSP_RESPONSE *rsp;
+    unsigned char resp_der[MAX_STAPLING_DER];
+    const unsigned char *p;
+    unsigned int resp_derlen = MAX_STAPLING_DER;
+
+    if (mc->stapling_cache->flags & AP_SOCACHE_FLAG_NOTMPSAFE)
+        stapling_cache_mutex_on(s);
+    rv = mc->stapling_cache->retrieve(mc->stapling_cache_context, s,
+                                      cinf->idx, sizeof(cinf->idx),
+                                      resp_der, &resp_derlen, pool);
+    if (mc->stapling_cache->flags & AP_SOCACHE_FLAG_NOTMPSAFE)
+        stapling_cache_mutex_off(s);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01930)
+                     "stapling_get_cached_response: cache miss");
+        return;
+    }
+    if (resp_derlen <= 1) {
+        /* should-not-occur; must have at least valid-when-stored flag +
+         * OCSPResponseStatus
+         */
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01931)
+                     "stapling_get_cached_response: response length invalid??");
+        return;
+    }
+    p = resp_der;
+    if (*p) /* valid when stored */
+        *pok = TRUE;
+    else
+        *pok = FALSE;
+    p++;
+    resp_derlen--;
+    rsp = d2i_OCSP_RESPONSE(NULL, &p, resp_derlen);
+    if (!rsp) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01932)
+                     "stapling_get_cached_response: response parse error??");
+        return;
+    }
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01933)
+                 "stapling_get_cached_response: cache hit");
+
+    *prsp = rsp;
+}
+
+static int stapling_set_response(SSL *ssl, OCSP_RESPONSE *rsp)
+{
+    int rspderlen;
+    unsigned char *rspder = NULL;
+
+    rspderlen = i2d_OCSP_RESPONSE(rsp, &rspder);
+    if (rspderlen <= 0)
+        return 0;
+    SSL_set_tlsext_status_ocsp_resp(ssl, rspder, rspderlen);
+    return 1;
+}
+
+static int stapling_check_response(server_rec *s, modssl_ctx_t *mctx,
+                                   certinfo *cinf, OCSP_RESPONSE *rsp,
+                                   BOOL *pok)
+{
+    int status = V_OCSP_CERTSTATUS_UNKNOWN;
+    int reason = OCSP_REVOKED_STATUS_NOSTATUS;
+    OCSP_BASICRESP *bs = NULL;
+    ASN1_GENERALIZEDTIME *rev, *thisupd, *nextupd;
+    int response_status = OCSP_response_status(rsp);
+    int rv = SSL_TLSEXT_ERR_OK;
+
+    if (pok)
+        *pok = FALSE;
+    /* Check to see if response is an error. If so we automatically accept
+     * it because it would have expired from the cache if it was time to
+     * retry.
+     */
+    if (response_status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
+        if (mctx->stapling_return_errors)
+            return SSL_TLSEXT_ERR_OK;
+        else
+            return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    bs = OCSP_response_get1_basic(rsp);
+    if (bs == NULL) {
+        /* If we can't parse response just pass it to client */
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01934)
+                     "stapling_check_response: Error Parsing Response!");
+        return SSL_TLSEXT_ERR_OK;
+    }
+
+    if (!OCSP_resp_find_status(bs, cinf->cid, &status, &reason, &rev,
+                               &thisupd, &nextupd)) {
+        /* If ID not present pass back to client (if configured so) */
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01935)
+                     "stapling_check_response: certificate ID not present in response!");
+        if (mctx->stapling_return_errors == FALSE)
+            rv = SSL_TLSEXT_ERR_NOACK;
+    }
+    else {
+        if (OCSP_check_validity(thisupd, nextupd,
+                                mctx->stapling_resptime_skew,
+                                mctx->stapling_resp_maxage)) {
+            if (pok)
+                *pok = TRUE;
+        }
+        else {
+            /* If pok is not NULL response was direct from a responder and
+             * the times should be valide. If pok is NULL the response was
+             * retrieved from cache and it is expected to subsequently expire
+             */
+            if (pok) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01936)
+                             "stapling_check_response: response times invalid");
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01937)
+                             "stapling_check_response: cached response expired");
+            }
+
+            rv = SSL_TLSEXT_ERR_NOACK;
+        }
+
+        if (status != V_OCSP_CERTSTATUS_GOOD) {
+            char snum[MAX_STRING_LEN] = { '\0' };
+            BIO *bio = BIO_new(BIO_s_mem());
+
+            if (bio) {
+                int n;
+                ASN1_INTEGER *pserial;
+                OCSP_id_get0_info(NULL, NULL, NULL, &pserial, cinf->cid);
+                if ((i2a_ASN1_INTEGER(bio, pserial) != -1) &&
+                    ((n = BIO_read(bio, snum, sizeof snum - 1)) > 0))
+                    snum[n] = '\0';
+                BIO_free(bio);
+            }
+
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02969)
+                         "stapling_check_response: response has certificate "
+                         "status %s (reason: %s) for serial number %s",
+                         OCSP_cert_status_str(status),
+                         (reason != OCSP_REVOKED_STATUS_NOSTATUS) ?
+                         OCSP_crl_reason_str(reason) : "n/a",
+                         snum[0] ? snum : "[n/a]");
+
+            if (mctx->stapling_return_errors == FALSE) {
+                if (pok)
+                    *pok = FALSE;
+                rv = SSL_TLSEXT_ERR_NOACK;
+            }
+        }
+    }
+
+    OCSP_BASICRESP_free(bs);
+
+    return rv;
+}
+
+static BOOL stapling_renew_response(server_rec *s, modssl_ctx_t *mctx, SSL *ssl,
+                                    certinfo *cinf, OCSP_RESPONSE **prsp,
+                                    BOOL *pok, apr_pool_t *pool)
+{
+    conn_rec *conn      = (conn_rec *)SSL_get_app_data(ssl);
+    apr_pool_t *vpool;
+    OCSP_REQUEST *req = NULL;
+    OCSP_CERTID *id = NULL;
+    STACK_OF(X509_EXTENSION) *exts;
+    int i;
+    BOOL rv = TRUE;
+    const char *ocspuri;
+    apr_uri_t uri;
+
+    *prsp = NULL;
+    /* Build up OCSP query from server certificate info */
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01938)
+                 "stapling_renew_response: querying responder");
+
+    req = OCSP_REQUEST_new();
+    if (!req)
+        goto err;
+    id = OCSP_CERTID_dup(cinf->cid);
+    if (!id)
+        goto err;
+    if (!OCSP_request_add0_id(req, id))
+        goto err;
+    id = NULL;
+    /* Add any extensions to the request */
+    SSL_get_tlsext_status_exts(ssl, &exts);
+    for (i = 0; i < sk_X509_EXTENSION_num(exts); i++) {
+        X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
+        if (!OCSP_REQUEST_add_ext(req, ext, -1))
+            goto err;
+    }
+
+    if (mctx->stapling_force_url)
+        ocspuri = mctx->stapling_force_url;
+    else
+        ocspuri = cinf->uri;
+
+    if (!ocspuri) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02621)
+                     "stapling_renew_response: no uri for responder");
+        rv = FALSE;
+        goto done;
+    }
+
+    /* Create a temporary pool to constrain memory use */
+    apr_pool_create(&vpool, conn->pool);
+    apr_pool_tag(vpool, "modssl_stapling_renew");
+
+    if (apr_uri_parse(vpool, ocspuri, &uri) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01939)
+                     "stapling_renew_response: Error parsing uri %s",
+                      ocspuri);
+        rv = FALSE;
+        goto done;
+    }
+    else if (strcmp(uri.scheme, "http")) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01940)
+                     "stapling_renew_response: Unsupported uri %s", ocspuri);
+        rv = FALSE;
+        goto done;
+    }
+
+    if (!uri.port) {
+        uri.port = apr_uri_port_of_scheme(uri.scheme);
+    }
+
+    *prsp = modssl_dispatch_ocsp_request(&uri, mctx->stapling_responder_timeout,
+                                         req, conn, vpool);
+
+    apr_pool_destroy(vpool);
+
+    if (!*prsp) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01941)
+                     "stapling_renew_response: responder error");
+        if (mctx->stapling_fake_trylater) {
+            *prsp = OCSP_response_create(OCSP_RESPONSE_STATUS_TRYLATER, NULL);
+        }
+        else {
+            goto done;
+        }
+    }
+    else {
+        int response_status = OCSP_response_status(*prsp);
+
+        if (response_status == OCSP_RESPONSE_STATUS_SUCCESSFUL) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01942)
+                        "stapling_renew_response: query response received");
+            stapling_check_response(s, mctx, cinf, *prsp, pok);
+            if (*pok == FALSE) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01943)
+                             "stapling_renew_response: error in retrieved response!");
+            }
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01944)
+                         "stapling_renew_response: responder error %s",
+                         OCSP_response_status_str(response_status));
+            *pok = FALSE;
+        }
+    }
+    if (stapling_cache_response(s, mctx, *prsp, cinf, *pok, pool) == FALSE) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01945)
+                     "stapling_renew_response: error caching response!");
+    }
+
+done:
+    if (id)
+        OCSP_CERTID_free(id);
+    if (req)
+        OCSP_REQUEST_free(req);
+    return rv;
+err:
+    rv = FALSE;
+    goto done;
+}
+
+/*
+ * SSL stapling mutex operations. Similar to SSL mutex except mutexes are
+ * mandatory if stapling is enabled.
+ */
+static int ssl_stapling_mutex_init(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    apr_status_t rv;
+
+    /* already init or stapling not enabled? */
+    if (mc->stapling_refresh_mutex || sc->server->stapling_enabled != TRUE) {
+        return TRUE;
+    }
+
+    /* need a cache mutex? */
+    if (mc->stapling_cache->flags & AP_SOCACHE_FLAG_NOTMPSAFE) {
+        if ((rv = ap_global_mutex_create(&mc->stapling_cache_mutex, NULL,
+                                         SSL_STAPLING_CACHE_MUTEX_TYPE, NULL, s,
+                                         s->process->pool, 0)) != APR_SUCCESS) {
+            return FALSE;
+        }
+    }
+
+    /* always need stapling_refresh_mutex */
+    if ((rv = ap_global_mutex_create(&mc->stapling_refresh_mutex, NULL,
+                                     SSL_STAPLING_REFRESH_MUTEX_TYPE, NULL, s,
+                                     s->process->pool, 0)) != APR_SUCCESS) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static int stapling_mutex_reinit_helper(server_rec *s, apr_pool_t *p, 
+                                        apr_global_mutex_t **mutex,
+                                        const char *type)
+{
+    apr_status_t rv;
+    const char *lockfile;
+
+    lockfile = apr_global_mutex_lockfile(*mutex);
+    if ((rv = apr_global_mutex_child_init(mutex,
+                                          lockfile, p)) != APR_SUCCESS) {
+        if (lockfile) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(01946)
+                         "Cannot reinit %s mutex with file `%s'",
+                         type, lockfile);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(01947)
+                         "Cannot reinit %s mutex", type);
+        }
+        return FALSE;
+    }
+    return TRUE;
+}
+
+int ssl_stapling_mutex_reinit(server_rec *s, apr_pool_t *p)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    if (mc->stapling_cache_mutex != NULL
+        && stapling_mutex_reinit_helper(s, p, &mc->stapling_cache_mutex,
+                                        SSL_STAPLING_CACHE_MUTEX_TYPE) == FALSE) {
+        return FALSE;
+    }
+
+    if (mc->stapling_refresh_mutex != NULL
+        && stapling_mutex_reinit_helper(s, p, &mc->stapling_refresh_mutex,
+                                        SSL_STAPLING_REFRESH_MUTEX_TYPE) == FALSE) {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static int stapling_mutex_on(server_rec *s, apr_global_mutex_t *mutex,
+                             const char *name)
+{
+    apr_status_t rv;
+
+    if ((rv = apr_global_mutex_lock(mutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(01948)
+                     "Failed to acquire OCSP %s lock", name);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static int stapling_mutex_off(server_rec *s, apr_global_mutex_t *mutex,
+                              const char *name)
+{
+    apr_status_t rv;
+
+    if ((rv = apr_global_mutex_unlock(mutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, rv, s, APLOGNO(01949)
+                     "Failed to release OCSP %s lock", name);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static int stapling_cache_mutex_on(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    return stapling_mutex_on(s, mc->stapling_cache_mutex,
+                             SSL_STAPLING_CACHE_MUTEX_TYPE);
+}
+
+static int stapling_cache_mutex_off(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    return stapling_mutex_off(s, mc->stapling_cache_mutex,
+                              SSL_STAPLING_CACHE_MUTEX_TYPE);
+}
+
+static int stapling_refresh_mutex_on(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    return stapling_mutex_on(s, mc->stapling_refresh_mutex,
+                             SSL_STAPLING_REFRESH_MUTEX_TYPE);
+}
+
+static int stapling_refresh_mutex_off(server_rec *s)
+{
+    SSLModConfigRec *mc = myModConfig(s);
+
+    return stapling_mutex_off(s, mc->stapling_refresh_mutex,
+                              SSL_STAPLING_REFRESH_MUTEX_TYPE);
+}
+
+static int get_and_check_cached_response(server_rec *s, modssl_ctx_t *mctx,
+                                         OCSP_RESPONSE **rsp, BOOL *pok,
+                                         certinfo *cinf, apr_pool_t *p)
+{
+    BOOL ok = FALSE;
+    int rv;
+
+    AP_DEBUG_ASSERT(*rsp == NULL);
+
+    /* Check to see if we already have a response for this certificate */
+    stapling_get_cached_response(s, rsp, &ok, cinf, p);
+
+    if (*rsp) {
+        /* see if response is acceptable */
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01953)
+                     "stapling_cb: retrieved cached response");
+        rv = stapling_check_response(s, mctx, cinf, *rsp, NULL);
+        if (rv == SSL_TLSEXT_ERR_ALERT_FATAL) {
+            OCSP_RESPONSE_free(*rsp);
+            *rsp = NULL;
+            return SSL_TLSEXT_ERR_ALERT_FATAL;
+        }
+        else if (rv == SSL_TLSEXT_ERR_NOACK) {
+            /* Error in response. If this error was not present when it was
+             * stored (i.e. response no longer valid) then it can be
+             * renewed straight away.
+             *
+             * If the error *was* present at the time it was stored then we
+             * don't renew the response straight away; we just wait for the
+             * cached response to expire.
+             */
+            if (ok) {
+                OCSP_RESPONSE_free(*rsp);
+                *rsp = NULL;
+            }
+            else if (!mctx->stapling_return_errors) {
+                OCSP_RESPONSE_free(*rsp);
+                *rsp = NULL;
+                *pok = FALSE;
+                return SSL_TLSEXT_ERR_NOACK;
+            }
+        }
+    }
+    return 0;
+}
+
+typedef struct {
+    unsigned char *data;
+    apr_size_t len;
+} ocsp_resp;
+
+static void copy_ocsp_resp(const unsigned char *der, apr_size_t der_len, void *userdata)
+{
+    ocsp_resp *resp = userdata;
+
+    resp->len = 0;
+    resp->data = der? OPENSSL_malloc(der_len) : NULL;
+    if (resp->data) {
+        memcpy(resp->data, der, der_len);
+        resp->len = der_len;
+    }
+}
+
+/* Certificate Status callback. This is called when a client includes a
+ * certificate status request extension.
+ *
+ * Check for cached responses in session cache. If valid send back to
+ * client.  If absent or no longer valid, query responder and update
+ * cache.
+ */
+static int stapling_cb(SSL *ssl, void *arg)
+{
+    conn_rec *conn      = (conn_rec *)SSL_get_app_data(ssl);
+    server_rec *s       = mySrvFromConn(conn);
+    SSLSrvConfigRec *sc = mySrvConfig(s);
+    modssl_ctx_t *mctx  = myConnCtxConfig(conn, sc);
+    UCHAR idx[SHA_DIGEST_LENGTH];
+    ocsp_resp resp;
+    certinfo *cinf = NULL;
+    OCSP_RESPONSE *rsp = NULL;
+    int rv;
+    BOOL ok = TRUE;
+    X509 *x;
+    int rspderlen, provided = 0;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01951)
+                 "stapling_cb: OCSP Stapling callback called");
+
+    x = SSL_get_certificate(ssl);
+    if (x == NULL) {
+        return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    if (X509_digest(x, EVP_sha1(), idx, NULL) != 1) {
+        return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    if (ap_ssl_ocsp_get_resp(s, conn, (const char*)idx, sizeof(idx),
+                             copy_ocsp_resp, &resp) == APR_SUCCESS) {
+        provided = 1;
+    }
+    else if (ssl_run_get_stapling_status(&resp.data, &rspderlen, conn, s, x) == APR_SUCCESS) {
+        resp.len = (apr_size_t)rspderlen;
+        provided = 1;
+    }
+
+    if (provided) {
+        /* a hook handles stapling for this certificate and determines the response */
+        if (resp.data == NULL || resp.len == 0) {
+            return SSL_TLSEXT_ERR_NOACK;
+        }
+        SSL_set_tlsext_status_ocsp_resp(ssl, resp.data, (int)resp.len);
+        return SSL_TLSEXT_ERR_OK;
+    }
+    
+    if (sc->server->stapling_enabled != TRUE) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01950)
+                     "stapling_cb: OCSP Stapling disabled");
+        return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    if ((cinf = stapling_get_certinfo(s, idx, sizeof(idx), mctx, ssl)) == NULL) {
+        return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01952)
+                 "stapling_cb: retrieved cached certificate data");
+
+    rv = get_and_check_cached_response(s, mctx, &rsp, &ok, cinf, conn->pool);
+    if (rv != 0) {
+        return rv;
+    }
+
+    if (rsp == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01954)
+                     "stapling_cb: renewing cached response");
+        stapling_refresh_mutex_on(s);
+        /* Maybe another request refreshed the OCSP response while this
+         * thread waited for the mutex.  Check again.
+         */
+        rv = get_and_check_cached_response(s, mctx, &rsp, &ok, cinf,
+                                           conn->pool);
+        if (rv != 0) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(03236)
+                         "stapling_cb: error checking for cached response "
+                         "after obtaining refresh mutex");
+            stapling_refresh_mutex_off(s);
+            return rv;
+        }
+        else if (rsp) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(03237)
+                         "stapling_cb: don't need to refresh cached response "
+                         "after obtaining refresh mutex");
+            stapling_refresh_mutex_off(s);
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(03238)
+                         "stapling_cb: still must refresh cached response "
+                         "after obtaining refresh mutex");
+            rv = stapling_renew_response(s, mctx, ssl, cinf, &rsp, &ok,
+                                         conn->pool);
+            stapling_refresh_mutex_off(s);
+
+            if (rv == TRUE) {
+                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(03040)
+                             "stapling_cb: success renewing response");
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(01955)
+                             "stapling_cb: fatal error renewing response");
+                return SSL_TLSEXT_ERR_ALERT_FATAL;
+            }
+        }
+    }
+
+    if (rsp && ((ok == TRUE) || (mctx->stapling_return_errors == TRUE))) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01956)
+                     "stapling_cb: setting response");
+        if (!stapling_set_response(ssl, rsp)) {
+            rv = SSL_TLSEXT_ERR_ALERT_FATAL;
+        }
+        else {
+            rv = SSL_TLSEXT_ERR_OK;
+        }
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01957)
+                     "stapling_cb: no suitable response available");
+        rv = SSL_TLSEXT_ERR_NOACK;
+    }
+    OCSP_RESPONSE_free(rsp); /* NULL safe */
+
+    return rv;
+}
+
+apr_status_t modssl_init_stapling(server_rec *s, apr_pool_t *p,
+                                  apr_pool_t *ptemp, modssl_ctx_t *mctx)
+{
+    SSL_CTX *ctx = mctx->ssl_ctx;
+    SSLModConfigRec *mc = myModConfig(s);
+
+    if (mc->stapling_cache == NULL) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01958)
+                     "SSLStapling: no stapling cache available");
+        return ssl_die(s);
+    }
+    if (ssl_stapling_mutex_init(s, ptemp) == FALSE) {
+        ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01959)
+                     "SSLStapling: cannot initialise stapling mutex");
+        return ssl_die(s);
+    }
+    /* Set some default values for parameters if they are not set */
+    if (mctx->stapling_resptime_skew == UNSET) {
+        mctx->stapling_resptime_skew = 60 * 5;
+    }
+    if (mctx->stapling_cache_timeout == UNSET) {
+        mctx->stapling_cache_timeout = 3600;
+    }
+    if (mctx->stapling_return_errors == UNSET) {
+        mctx->stapling_return_errors = TRUE;
+    }
+    if (mctx->stapling_fake_trylater == UNSET) {
+        mctx->stapling_fake_trylater = TRUE;
+    }
+    if (mctx->stapling_errcache_timeout == UNSET) {
+        mctx->stapling_errcache_timeout = 600;
+    }
+    if (mctx->stapling_responder_timeout == UNSET) {
+        mctx->stapling_responder_timeout = 10 * APR_USEC_PER_SEC;
+    }
+
+    SSL_CTX_set_tlsext_status_cb(ctx, stapling_cb);
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01960) "OCSP stapling initialized");
+    
+    return APR_SUCCESS;
+}
+
+#endif