Adding upstream version 2.4.38.upstream/2.4.38upstream

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

1 files changed, 2201 insertions, 0 deletions

diff --git a/modules/ssl/ssl_engine_init.c b/modules/ssl/ssl_engine_init.c
new file mode 100644
index 0000000..18d18c6
--- /dev/null
+++ b/modules/ssl/ssl_engine_init.c
@@ -0,0 +1,2201 @@
+/* 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"
+
+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)
+
+/*  _________________________________________________________________
+**
+**  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;
+}
+#endif
+
+/*
+ * 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. */
+}
+
+static void ssl_add_version_components(apr_pool_t *p,
+                                       server_rec *s)
+{
+    char *modver = ssl_var_lookup(p, s, NULL, NULL, "SSL_VERSION_INTERFACE");
+    char *libver = ssl_var_lookup(p, s, NULL, NULL, "SSL_VERSION_LIBRARY");
+    char *incver = ssl_var_lookup(p, s, NULL, NULL,
+                                  "SSL_VERSION_LIBRARY_INTERFACE");
+
+    ap_add_version_component(p, libver);
+
+    ap_log_error(APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(01876)
+                 "%s compiled against Server: %s, Library: %s",
+                 modver, AP_SERVER_BASEVERSION, incver);
+}
+
+/**************************************************************************************************/
+/* Managed Domains Interface */
+
+static APR_OPTIONAL_FN_TYPE(md_is_managed) *md_is_managed;
+static APR_OPTIONAL_FN_TYPE(md_get_certificate) *md_get_certificate;
+static APR_OPTIONAL_FN_TYPE(md_is_challenge) *md_is_challenge;
+
+int ssl_is_challenge(conn_rec *c, const char *servername, 
+                     X509 **pcert, EVP_PKEY **pkey)
+{
+    if (md_is_challenge) {
+        return md_is_challenge(c, servername, pcert, pkey);
+    }
+    *pcert = NULL;
+    *pkey = NULL;
+    return 0;
+}
+
+/*
+ *  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);
+
+    /* Initialize our interface to mod_md, if it is loaded 
+     */
+    md_is_managed = APR_RETRIEVE_OPTIONAL_FN(md_is_managed);
+    md_get_certificate = APR_RETRIEVE_OPTIONAL_FN(md_get_certificate);
+    md_is_challenge = APR_RETRIEVE_OPTIONAL_FN(md_is_challenge);
+    if (!md_is_managed || !md_get_certificate) {
+        md_is_managed = NULL;
+        md_get_certificate = NULL;
+    }
+
+    /*
+     *  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;
+        }
+
+#ifdef HAVE_FIPS
+        if (sc->fips == UNSET) {
+            sc->fips = FALSE;
+        }
+#endif
+    }
+
+#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, s, 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(sc->fips) {
+        if (!FIPS_mode()) {
+            if (FIPS_mode_set(1)) {
+                ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(01884)
+                             "Operating in SSL FIPS mode");
+            }
+            else {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01885) "FIPS mode failed");
+                ssl_log_ssl_error(SSLLOG_MARK, APLOG_EMERG, s);
+                return ssl_die(s);
+            }
+        }
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01886)
+                     "SSL 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(p, base_server);
+
+    modssl_init_app_data2_idx(); /* for modssl_get_app_data2() at request time */
+
+    init_dh_params();
+#if !MODSSL_USE_OPENSSL_PRE_1_1_API
+    init_bio_methods();
+#endif
+
+    return OK;
+}
+
+/*
+ * Support for external a Crypto Device ("engine"), usually
+ * a hardware accellerator 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");
+
+    /*
+     * Server name indication (SNI)
+     */
+    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);
+    }
+
+#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 (SSL_HAVE_PROTOCOL_TLSV1_3 && (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
+    
+    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;
+
+    SSL_CTX_set_tmp_dh_callback(ctx,  ssl_callback_TmpDH);
+
+    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_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 (!SSL_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_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 || !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_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 *dhparams;
+#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++) {
+        key_id = apr_psprintf(ptemp, "%s:%d", vhost_id, i);
+
+        ERR_clear_error();
+
+        /* first the certificate (public key) */
+        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 ((SSL_CTX_use_PrivateKey_file(mctx->ssl_ctx, keyfile,
+                                         SSL_FILETYPE_PEM) < 1) &&
+            (ERR_GET_FUNC(ERR_peek_last_error())
+                != X509_F_X509_CHECK_PRIVATE_KEY)) {
+            ssl_asn1_t *asn1;
+            EVP_PKEY *pkey;
+            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 ((mctx->stapling_enabled == TRUE) &&
+            !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
+     */
+    if ((certfile = APR_ARRAY_IDX(mctx->pks->cert_files, 0, const char *)) &&
+        (dhparams = ssl_dh_GetParamFromFile(certfile))) {
+        SSL_CTX_set_tmp_dh(mctx->ssl_ctx, dhparams);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02540)
+                     "Custom DH parameters (%d bits) for %s loaded from %s",
+                     DH_bits(dhparams), vhost_id, certfile);
+        DH_free(dhparams);
+    }
+
+#ifdef HAVE_ECC
+    /*
+     * Similarly, try to read the ECDH curve name from SSLCertificateFile...
+     */
+    if ((certfile != NULL) && 
+        (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;
+
+    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->hmac_secret, buf + 16, 16);
+    memcpy(ticket_key->aes_key, buf + 32, 16);
+
+    if (!SSL_CTX_set_tlsext_ticket_key_cb(mctx->ssl_ctx,
+                                          ssl_callback_SessionTicket)) {
+        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) {
+        apr_dir_t *dir;
+        apr_finfo_t dirent;
+        apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME;
+    
+        if (apr_dir_open(&dir, pkp->cert_path, ptemp) == APR_SUCCESS) {
+            while ((apr_dir_read(&dirent, finfo_flags, dir)) == APR_SUCCESS) {
+                const char *fullname;
+
+                if (dirent.filetype == APR_DIR) {
+                    continue; /* don't try to load directories */
+                }
+        
+                fullname = apr_pstrcat(ptemp,
+                                       pkp->cert_path, "/", dirent.name,
+                                       NULL);
+                load_x509_info(ptemp, sk, fullname);
+            }
+
+            apr_dir_close(dir);
+        }
+    }
+
+    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);
+    }
+
+    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;
+#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
+
+    /*
+     *  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;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(10083)
+                 "Init: (%s) mod_md support is %s.", ssl_util_vhostid(p, s),
+                 md_is_managed? "available" : "unavailable");
+    if (md_is_managed && md_is_managed(s)) {
+        modssl_pk_server_t *const pks = sc->server->pks;
+        if (pks->cert_files->nelts > 0 || pks->key_files->nelts > 0) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10084)
+                         "Init: (%s) You configured certificate/key files on this host, but "
+                         "is is covered by a Managed Domain. You need to remove these directives "
+                         "for the Managed Domain to take over.", ssl_util_vhostid(p, s));
+        }
+        else {
+            const char *key_file, *cert_file, *chain_file;
+            
+            key_file = cert_file = chain_file = NULL;
+            
+            if (md_get_certificate) {
+                rv = md_get_certificate(s, p, &key_file, &cert_file);
+            }
+            else {
+                rv = APR_ENOTIMPL;
+            }
+            
+            if (key_file && cert_file) {
+                ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, s, 
+                             "%s: installing key=%s, cert=%s, chain=%s", 
+                             ssl_util_vhostid(p, s), key_file, cert_file, chain_file);
+                APR_ARRAY_PUSH(pks->key_files, const char *) = key_file;
+                APR_ARRAY_PUSH(pks->cert_files, const char *) = cert_file;
+                sc->server->cert_chain = chain_file;
+            }
+            
+            if (APR_STATUS_IS_EAGAIN(rv)) {
+                /* Managed Domain not ready yet. This is not a reason to fail the config */
+                ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(10085)
+                             "Init: %s will respond with '503 Service Unavailable' for now. This "
+                             "host is part of a Managed Domain, but no SSL certificate is "
+                             "available (yet).", ssl_util_vhostid(p, s));
+                pks->service_unavailable = 1;
+            }
+            else if (rv != APR_SUCCESS) {
+                return rv;
+            }
+        }
+    }
+    
+    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.
+     */
+    if (sc->server->stapling_enabled == TRUE) {
+        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++;
+        }
+    }
+#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);
+}
+
+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) {
+        apr_dir_t *dir;
+        apr_finfo_t direntry;
+        apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME;
+        apr_status_t rv;
+
+        if ((rv = apr_dir_open(&dir, ca_path, ptemp)) != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(02211)
+                    "Failed to open Certificate Path `%s'",
+                    ca_path);
+            sk_X509_NAME_pop_free(ca_list, X509_NAME_free);
+            return NULL;
+        }
+
+        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, ca_path, "/", direntry.name, NULL);
+            ssl_init_PushCAList(ca_list, s, ptemp, file);
+        }
+
+        apr_dir_close(dir);
+    }
+
+    /*
+     * 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_bio_methods();
+#endif
+    free_dh_params();
+
+    return APR_SUCCESS;
+}