Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 1566 insertions, 0 deletions

diff --git a/src/tls/tls_misc.c b/src/tls/tls_misc.c
new file mode 100644
index 0000000..c2b1121
--- /dev/null
+++ b/src/tls/tls_misc.c
@@ -0,0 +1,1566 @@
+/*++
+/* NAME
+/*	tls_misc 3
+/* SUMMARY
+/*	miscellaneous TLS support routines
+/* SYNOPSIS
+/* .SH Public functions
+/* .nf
+/* .na
+/*	#include <tls.h>
+/*
+/*	void tls_log_summary(role, usage, TLScontext)
+/*	TLS_ROLE role;
+/*	TLS_USAGE usage;
+/*	TLS_SESS_STATE *TLScontext;
+/*
+/*	const char *tls_compile_version(void)
+/*
+/*	const char *tls_run_version(void)
+/*
+/*	const char **tls_pkey_algorithms(void)
+/*
+/*	void	tls_pre_jail_init(TLS_ROLE)
+/*	TLS_ROLE role;
+/*
+/* .SH Internal functions
+/* .nf
+/* .na
+/*	#define TLS_INTERNAL
+/*	#include <tls.h>
+/*
+/*	char	*var_tls_high_clist;
+/*	char	*var_tls_medium_clist;
+/*	char	*var_tls_low_clist;
+/*	char	*var_tls_export_clist;
+/*	char	*var_tls_null_clist;
+/*	char	*var_tls_eecdh_auto;
+/*	char	*var_tls_eecdh_strong;
+/*	char	*var_tls_eecdh_ultra;
+/*	char	*var_tls_dane_digests;
+/*	int	var_tls_daemon_rand_bytes;
+/*	bool	var_tls_append_def_CA;
+/*	bool	var_tls_preempt_clist;
+/*	bool	var_tls_bc_pkey_fprint;
+/*	bool	var_tls_multi_wildcard;
+/*	char	*var_tls_mgr_service;
+/*	char	*var_tls_tkt_cipher;
+/*	char	*var_openssl_path;
+/*	char	*var_tls_server_sni_maps;
+/*	bool	var_tls_fast_shutdown;
+/*
+/*	TLS_APPL_STATE *tls_alloc_app_context(ssl_ctx, log_mask)
+/*	SSL_CTX	*ssl_ctx;
+/*	int	log_mask;
+/*
+/*	void	tls_free_app_context(app_ctx)
+/*	void	*app_ctx;
+/*
+/*	TLS_SESS_STATE *tls_alloc_sess_context(log_mask, namaddr)
+/*	int	log_mask;
+/*	const char *namaddr;
+/*
+/*	void	tls_free_context(TLScontext)
+/*	TLS_SESS_STATE *TLScontext;
+/*
+/*	void	tls_check_version()
+/*
+/*	long	tls_bug_bits()
+/*
+/*	void	tls_param_init()
+/*
+/*	int	tls_protocol_mask(plist)
+/*	const char *plist;
+/*
+/*	int	tls_cipher_grade(name)
+/*	const char *name;
+/*
+/*	const char *str_tls_cipher_grade(grade)
+/*	int	grade;
+/*
+/*	const char *tls_set_ciphers(TLScontext, grade, exclusions)
+/*	TLS_SESS_STATE *TLScontext;
+/*	int	grade;
+/*	const char *exclusions;
+/*
+/*	void tls_get_signature_params(TLScontext)
+/*	TLS_SESS_STATE *TLScontext;
+/*
+/*	void	tls_print_errors()
+/*
+/*	void	tls_info_callback(ssl, where, ret)
+/*	const SSL *ssl; /* unused */
+/*	int	where;
+/*	int	ret;
+/*
+/*	long	tls_bio_dump_cb(bio, cmd, argp, argi, argl, ret)
+/*	BIO	*bio;
+/*	int	cmd;
+/*	const char *argp;
+/*	int	argi;
+/*	long	argl; /* unused */
+/*	long	ret;
+/*
+/*	int	tls_log_mask(log_param, log_level)
+/*	const char *log_param;
+/*	const char *log_level;
+/*
+/*	void	 tls_update_app_logmask(app_ctx, log_mask)
+/*	TLS_APPL_STATE *app_ctx;
+/*	int	log_mask;
+/*
+/*	int	tls_validate_digest(dgst)
+/*	const char *dgst;
+/* DESCRIPTION
+/*	This module implements public and internal routines that
+/*	support the TLS client and server.
+/*
+/*	tls_log_summary() logs a summary of a completed TLS connection.
+/*	The "role" argument must be TLS_ROLE_CLIENT for outgoing client
+/*	connections, or TLS_ROLE_SERVER for incoming server connections,
+/*	and the "usage" must be TLS_USAGE_NEW or TLS_USAGE_USED.
+/*
+/*	tls_compile_version() returns a text string description of
+/*	the compile-time TLS library.
+/*
+/*	tls_run_version() is just tls_compile_version() but with the runtime
+/*	version instead of the compile-time version.
+/*
+/*	tls_pkey_algorithms() returns a pointer to null-terminated
+/*	array of string constants with the names of the supported
+/*	public-key algorithms.
+/*
+/*	tls_alloc_app_context() creates an application context that
+/*	holds the SSL context for the application and related cached state.
+/*
+/*	tls_free_app_context() deallocates the application context and its
+/*	contents (the application context is stored outside the TLS library).
+/*
+/*	tls_alloc_sess_context() creates an initialized TLS session context
+/*	structure with the specified log mask and peer name[addr].
+/*
+/*	tls_free_context() destroys a TLScontext structure
+/*	together with OpenSSL structures that are attached to it.
+/*
+/*	tls_check_version() logs a warning when the run-time OpenSSL
+/*	library differs in its major, minor or micro number from
+/*	the compile-time OpenSSL headers.
+/*
+/*	tls_bug_bits() returns the bug compatibility mask appropriate
+/*	for the run-time library. Some of the bug work-arounds are
+/*	not appropriate for some library versions.
+/*
+/*	tls_param_init() loads main.cf parameters used internally in
+/*	TLS library. Any errors are fatal.
+/*
+/*	tls_pre_jail_init() opens any tables that need to be opened before
+/*	entering a chroot jail. The "role" parameter must be TLS_ROLE_CLIENT
+/*	for clients and TLS_ROLE_SERVER for servers. Any errors are fatal.
+/*
+/*	tls_protocol_mask() returns a bitmask of excluded protocols, given
+/*	a list (plist) of protocols to include or (preceded by a '!') exclude.
+/*	If "plist" contains invalid protocol names, TLS_PROTOCOL_INVALID is
+/*	returned and no warning is logged.
+/*
+/*	tls_cipher_grade() converts a case-insensitive cipher grade
+/*	name (high, medium, low, export, null) to the corresponding
+/*	TLS_CIPHER_ constant.  When the input specifies an unrecognized
+/*	grade, tls_cipher_grade() logs no warning, and returns
+/*	TLS_CIPHER_NONE.
+/*
+/*	str_tls_cipher_grade() converts a cipher grade to a name.
+/*	When the input specifies an undefined grade, str_tls_cipher_grade()
+/*	logs no warning, returns a null pointer.
+/*
+/*	tls_set_ciphers() applies the requested cipher grade and exclusions
+/*	to the provided TLS session context, returning the resulting cipher
+/*	list string.  The return value is the cipherlist used and is
+/*	overwritten upon each call.  When the input is invalid,
+/*	tls_set_ciphers() logs a warning, and returns a null result.
+/*
+/*	tls_get_signature_params() updates the "TLScontext" with handshake
+/*	signature parameters pertaining to TLS 1.3, where the ciphersuite
+/*	no longer describes the asymmetric algorithms employed in the
+/*	handshake, which are negotiated separately.  This function
+/*	has no effect for TLS 1.2 and earlier.
+/*
+/*	tls_print_errors() queries the OpenSSL error stack,
+/*	logs the error messages, and clears the error stack.
+/*
+/*	tls_info_callback() is a call-back routine for the
+/*	SSL_CTX_set_info_callback() routine. It logs SSL events
+/*	to the Postfix logfile.
+/*
+/*	tls_bio_dump_cb() is a call-back routine for the
+/*	BIO_set_callback() routine. It logs SSL content to the
+/*	Postfix logfile.
+/*
+/*	tls_log_mask() converts a TLS log_level value from string
+/*	to mask.  The main.cf parameter name is passed along for
+/*	diagnostics.
+/*
+/*	tls_update_app_logmask() changes the log mask of the
+/*	application TLS context to the new setting.
+/*
+/*	tls_validate_digest() returns non-zero if the named digest
+/*	is usable and zero otherwise.
+/* LICENSE
+/* .ad
+/* .fi
+/*	This software is free. You can do with it whatever you want.
+/*	The original author kindly requests that you acknowledge
+/*	the use of his software.
+/* AUTHOR(S)
+/*	Originally written by:
+/*	Lutz Jaenicke
+/*	BTU Cottbus
+/*	Allgemeine Elektrotechnik
+/*	Universitaetsplatz 3-4
+/*	D-03044 Cottbus, Germany
+/*
+/*	Updated by:
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Victor Duchovni
+/*	Morgan Stanley
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <ctype.h>
+#include <string.h>
+
+#ifdef USE_TLS
+
+/* Utility library. */
+
+#include <vstream.h>
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <stringops.h>
+#include <argv.h>
+#include <name_mask.h>
+#include <name_code.h>
+#include <dict.h>
+#include <valid_hostname.h>
+
+ /*
+  * Global library.
+  */
+#include <mail_params.h>
+#include <mail_conf.h>
+#include <maps.h>
+
+ /*
+  * TLS library.
+  */
+#define TLS_INTERNAL
+#include <tls.h>
+
+ /* Application-specific. */
+
+ /*
+  * Tunable parameters.
+  */
+char   *var_tls_high_clist;
+char   *var_tls_medium_clist;
+char   *var_tls_low_clist;
+char   *var_tls_export_clist;
+char   *var_tls_null_clist;
+int     var_tls_daemon_rand_bytes;
+char   *var_tls_eecdh_auto;
+char   *var_tls_eecdh_strong;
+char   *var_tls_eecdh_ultra;
+char   *var_tls_dane_digests;
+bool    var_tls_append_def_CA;
+char   *var_tls_bug_tweaks;
+char   *var_tls_ssl_options;
+bool    var_tls_bc_pkey_fprint;
+bool    var_tls_multi_wildcard;
+char   *var_tls_mgr_service;
+char   *var_tls_tkt_cipher;
+char   *var_openssl_path;
+char   *var_tls_server_sni_maps;
+bool    var_tls_fast_shutdown;
+
+static MAPS *tls_server_sni_maps;
+
+#ifdef VAR_TLS_PREEMPT_CLIST
+bool    var_tls_preempt_clist;
+
+#endif
+
+ /*
+  * Index to attach TLScontext pointers to SSL objects, so that they can be
+  * accessed by call-back routines.
+  */
+int     TLScontext_index = -1;
+
+ /*
+  * Protocol name <=> mask conversion.
+  */
+static const NAME_CODE protocol_table[] = {
+    SSL_TXT_SSLV2, TLS_PROTOCOL_SSLv2,
+    SSL_TXT_SSLV3, TLS_PROTOCOL_SSLv3,
+    SSL_TXT_TLSV1, TLS_PROTOCOL_TLSv1,
+    SSL_TXT_TLSV1_1, TLS_PROTOCOL_TLSv1_1,
+    SSL_TXT_TLSV1_2, TLS_PROTOCOL_TLSv1_2,
+    TLS_PROTOCOL_TXT_TLSV1_3, TLS_PROTOCOL_TLSv1_3,
+    0, TLS_PROTOCOL_INVALID,
+};
+
+ /*
+  * SSL_OP_MUMBLE bug work-around name <=> mask conversion.
+  */
+#define NAMEBUG(x)	#x, SSL_OP_##x
+static const LONG_NAME_MASK ssl_bug_tweaks[] = {
+
+#ifndef SSL_OP_MICROSOFT_SESS_ID_BUG
+#define SSL_OP_MICROSOFT_SESS_ID_BUG		0
+#endif
+    NAMEBUG(MICROSOFT_SESS_ID_BUG),
+
+#ifndef SSL_OP_NETSCAPE_CHALLENGE_BUG
+#define SSL_OP_NETSCAPE_CHALLENGE_BUG		0
+#endif
+    NAMEBUG(NETSCAPE_CHALLENGE_BUG),
+
+#ifndef SSL_OP_LEGACY_SERVER_CONNECT
+#define SSL_OP_LEGACY_SERVER_CONNECT		0
+#endif
+    NAMEBUG(LEGACY_SERVER_CONNECT),
+
+#ifndef SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
+#define SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG 0
+#endif
+    NAMEBUG(NETSCAPE_REUSE_CIPHER_CHANGE_BUG),
+    "CVE-2010-4180", SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG,
+
+#ifndef SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
+#define SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG	0
+#endif
+    NAMEBUG(SSLREF2_REUSE_CERT_TYPE_BUG),
+
+#ifndef SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
+#define SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER	0
+#endif
+    NAMEBUG(MICROSOFT_BIG_SSLV3_BUFFER),
+
+#ifndef SSL_OP_MSIE_SSLV2_RSA_PADDING
+#define SSL_OP_MSIE_SSLV2_RSA_PADDING		0
+#endif
+    NAMEBUG(MSIE_SSLV2_RSA_PADDING),
+    "CVE-2005-2969", SSL_OP_MSIE_SSLV2_RSA_PADDING,
+
+#ifndef SSL_OP_SSLEAY_080_CLIENT_DH_BUG
+#define SSL_OP_SSLEAY_080_CLIENT_DH_BUG		0
+#endif
+    NAMEBUG(SSLEAY_080_CLIENT_DH_BUG),
+
+#ifndef SSL_OP_TLS_D5_BUG
+#define SSL_OP_TLS_D5_BUG			0
+#endif
+    NAMEBUG(TLS_D5_BUG),
+
+#ifndef SSL_OP_TLS_BLOCK_PADDING_BUG
+#define SSL_OP_TLS_BLOCK_PADDING_BUG		0
+#endif
+    NAMEBUG(TLS_BLOCK_PADDING_BUG),
+
+#ifndef SSL_OP_TLS_ROLLBACK_BUG
+#define SSL_OP_TLS_ROLLBACK_BUG			0
+#endif
+    NAMEBUG(TLS_ROLLBACK_BUG),
+
+#ifndef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
+#define SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS	0
+#endif
+    NAMEBUG(DONT_INSERT_EMPTY_FRAGMENTS),
+
+#ifndef SSL_OP_CRYPTOPRO_TLSEXT_BUG
+#define SSL_OP_CRYPTOPRO_TLSEXT_BUG		0
+#endif
+    NAMEBUG(CRYPTOPRO_TLSEXT_BUG),
+
+#ifndef SSL_OP_TLSEXT_PADDING
+#define SSL_OP_TLSEXT_PADDING	0
+#endif
+    NAMEBUG(TLSEXT_PADDING),
+
+#if 0
+
+    /*
+     * XXX: New with OpenSSL 1.1.1, this is turned on implicitly in
+     * SSL_CTX_new() and is not included in SSL_OP_ALL.  Allowing users to
+     * disable this would thus be a code change that would require clearing
+     * bug work-around bits in SSL_CTX, after setting SSL_OP_ALL.  Since this
+     * is presumably required for TLS 1.3 on today's Internet, the code
+     * change will be done separately later. For now this implicit bug
+     * work-around cannot be disabled via supported Postfix mechanisms.
+     */
+#ifndef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
+#define SSL_OP_ENABLE_MIDDLEBOX_COMPAT	0
+#endif
+    NAMEBUG(ENABLE_MIDDLEBOX_COMPAT),
+#endif
+
+    0, 0,
+};
+
+ /*
+  * SSL_OP_MUMBLE option name <=> mask conversion for options that are not
+  * (or may in the future not be) in SSL_OP_ALL.  These enable optional
+  * behavior, rather than bug interoperability work-arounds.
+  */
+#define NAME_SSL_OP(x)	#x, SSL_OP_##x
+static const LONG_NAME_MASK ssl_op_tweaks[] = {
+
+#ifndef SSL_OP_LEGACY_SERVER_CONNECT
+#define SSL_OP_LEGACY_SERVER_CONNECT	0
+#endif
+    NAME_SSL_OP(LEGACY_SERVER_CONNECT),
+
+#ifndef SSL_OP_NO_TICKET
+#define SSL_OP_NO_TICKET		0
+#endif
+    NAME_SSL_OP(NO_TICKET),
+
+#ifndef SSL_OP_NO_COMPRESSION
+#define SSL_OP_NO_COMPRESSION		0
+#endif
+    NAME_SSL_OP(NO_COMPRESSION),
+
+#ifndef SSL_OP_NO_RENEGOTIATION
+#define SSL_OP_NO_RENEGOTIATION		0
+#endif
+    NAME_SSL_OP(NO_RENEGOTIATION),
+
+#ifndef SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
+#define SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION	0
+#endif
+    NAME_SSL_OP(NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
+
+#ifndef SSL_OP_PRIORITIZE_CHACHA
+#define SSL_OP_PRIORITIZE_CHACHA	0
+#endif
+    NAME_SSL_OP(PRIORITIZE_CHACHA),
+
+#ifndef SSL_OP_ENABLE_MIDDLEBOX_COMPAT
+#define SSL_OP_ENABLE_MIDDLEBOX_COMPAT	0
+#endif
+    NAME_SSL_OP(ENABLE_MIDDLEBOX_COMPAT),
+
+    0, 0,
+};
+
+ /*
+  * Once these have been a NOOP long enough, they might some day be removed
+  * from OpenSSL.  The defines below will avoid bitrot issues if/when that
+  * happens.
+  */
+#ifndef SSL_OP_SINGLE_DH_USE
+#define SSL_OP_SINGLE_DH_USE 0
+#endif
+#ifndef SSL_OP_SINGLE_ECDH_USE
+#define SSL_OP_SINGLE_ECDH_USE 0
+#endif
+
+ /*
+  * Ciphersuite name <=> code conversion.
+  */
+const NAME_CODE tls_cipher_grade_table[] = {
+    "high", TLS_CIPHER_HIGH,
+    "medium", TLS_CIPHER_MEDIUM,
+    "low", TLS_CIPHER_LOW,
+    "export", TLS_CIPHER_EXPORT,
+    "null", TLS_CIPHER_NULL,
+    "invalid", TLS_CIPHER_NONE,
+    0, TLS_CIPHER_NONE,
+};
+
+ /*
+  * Log keyword <=> mask conversion.
+  */
+#define TLS_LOG_0 TLS_LOG_NONE
+#define TLS_LOG_1 TLS_LOG_SUMMARY
+#define TLS_LOG_2 (TLS_LOG_1 | TLS_LOG_VERBOSE | TLS_LOG_CACHE | TLS_LOG_DEBUG)
+#define TLS_LOG_3 (TLS_LOG_2 | TLS_LOG_TLSPKTS)
+#define TLS_LOG_4 (TLS_LOG_3 | TLS_LOG_ALLPKTS)
+
+static const NAME_MASK tls_log_table[] = {
+    "0", TLS_LOG_0,
+    "none", TLS_LOG_NONE,
+    "1", TLS_LOG_1,
+    "routine", TLS_LOG_1,
+    "2", TLS_LOG_2,
+    "debug", TLS_LOG_2,
+    "3", TLS_LOG_3,
+    "ssl-expert", TLS_LOG_3,
+    "4", TLS_LOG_4,
+    "ssl-developer", TLS_LOG_4,
+    "5", TLS_LOG_4,			/* for good measure */
+    "6", TLS_LOG_4,			/* for good measure */
+    "7", TLS_LOG_4,			/* for good measure */
+    "8", TLS_LOG_4,			/* for good measure */
+    "9", TLS_LOG_4,			/* for good measure */
+    "summary", TLS_LOG_SUMMARY,
+    "untrusted", TLS_LOG_UNTRUSTED,
+    "peercert", TLS_LOG_PEERCERT,
+    "certmatch", TLS_LOG_CERTMATCH,
+    "verbose", TLS_LOG_VERBOSE,		/* Postfix TLS library verbose */
+    "cache", TLS_LOG_CACHE,
+    "ssl-debug", TLS_LOG_DEBUG,		/* SSL library debug/verbose */
+    "ssl-handshake-packet-dump", TLS_LOG_TLSPKTS,
+    "ssl-session-packet-dump", TLS_LOG_TLSPKTS | TLS_LOG_ALLPKTS,
+    0, 0,
+};
+
+ /*
+  * Parsed OpenSSL version number.
+  */
+typedef struct {
+    int     major;
+    int     minor;
+    int     micro;
+    int     patch;
+    int     status;
+} TLS_VINFO;
+
+/* tls_log_mask - Convert user TLS loglevel to internal log feature mask */
+
+int     tls_log_mask(const char *log_param, const char *log_level)
+{
+    int     mask;
+
+    mask = name_mask_opt(log_param, tls_log_table, log_level,
+			 NAME_MASK_ANY_CASE | NAME_MASK_RETURN);
+    return (mask);
+}
+
+/* tls_update_app_logmask - update log level after init */
+
+void    tls_update_app_logmask(TLS_APPL_STATE *app_ctx, int log_mask)
+{
+    app_ctx->log_mask = log_mask;
+}
+
+/* tls_protocol_mask - Bitmask of protocols to exclude */
+
+int     tls_protocol_mask(const char *plist)
+{
+    char   *save;
+    char   *tok;
+    char   *cp;
+    int     code;
+    int     exclude = 0;
+    int     include = 0;
+
+#define FREE_AND_RETURN(ptr, res) do { \
+	myfree(ptr); \
+	return (res); \
+    } while (0)
+
+    save = cp = mystrdup(plist);
+    while ((tok = mystrtok(&cp, CHARS_COMMA_SP ":")) != 0) {
+	if (*tok == '!')
+	    exclude |= code =
+		name_code(protocol_table, NAME_CODE_FLAG_NONE, ++tok);
+	else
+	    include |= code =
+		name_code(protocol_table, NAME_CODE_FLAG_NONE, tok);
+	if (code == TLS_PROTOCOL_INVALID)
+	    FREE_AND_RETURN(save, TLS_PROTOCOL_INVALID);
+    }
+
+    /*
+     * When the include list is empty, use only the explicit exclusions.
+     * Otherwise, also exclude the complement of the include list from the
+     * built-in list of known protocols. There is no way to exclude protocols
+     * we don't know about at compile time, and this is unavoidable because
+     * the OpenSSL API works with compile-time *exclusion* bit-masks.
+     */
+    FREE_AND_RETURN(save,
+	(include ? (exclude | (TLS_KNOWN_PROTOCOLS & ~include)) : exclude));
+}
+
+/* tls_param_init - Load TLS related config parameters */
+
+void    tls_param_init(void)
+{
+    /* If this changes, update TLS_CLIENT_PARAMS in tls_proxy.h. */
+    static const CONFIG_STR_TABLE str_table[] = {
+	VAR_TLS_HIGH_CLIST, DEF_TLS_HIGH_CLIST, &var_tls_high_clist, 1, 0,
+	VAR_TLS_MEDIUM_CLIST, DEF_TLS_MEDIUM_CLIST, &var_tls_medium_clist, 1, 0,
+	VAR_TLS_LOW_CLIST, DEF_TLS_LOW_CLIST, &var_tls_low_clist, 1, 0,
+	VAR_TLS_EXPORT_CLIST, DEF_TLS_EXPORT_CLIST, &var_tls_export_clist, 1, 0,
+	VAR_TLS_NULL_CLIST, DEF_TLS_NULL_CLIST, &var_tls_null_clist, 1, 0,
+	VAR_TLS_EECDH_AUTO, DEF_TLS_EECDH_AUTO, &var_tls_eecdh_auto, 1, 0,
+	VAR_TLS_EECDH_STRONG, DEF_TLS_EECDH_STRONG, &var_tls_eecdh_strong, 1, 0,
+	VAR_TLS_EECDH_ULTRA, DEF_TLS_EECDH_ULTRA, &var_tls_eecdh_ultra, 1, 0,
+	VAR_TLS_BUG_TWEAKS, DEF_TLS_BUG_TWEAKS, &var_tls_bug_tweaks, 0, 0,
+	VAR_TLS_SSL_OPTIONS, DEF_TLS_SSL_OPTIONS, &var_tls_ssl_options, 0, 0,
+	VAR_TLS_DANE_DIGESTS, DEF_TLS_DANE_DIGESTS, &var_tls_dane_digests, 1, 0,
+	VAR_TLS_MGR_SERVICE, DEF_TLS_MGR_SERVICE, &var_tls_mgr_service, 1, 0,
+	VAR_TLS_TKT_CIPHER, DEF_TLS_TKT_CIPHER, &var_tls_tkt_cipher, 0, 0,
+	VAR_OPENSSL_PATH, DEF_OPENSSL_PATH, &var_openssl_path, 1, 0,
+	0,
+    };
+
+    /* If this changes, update TLS_CLIENT_PARAMS in tls_proxy.h. */
+    static const CONFIG_INT_TABLE int_table[] = {
+	VAR_TLS_DAEMON_RAND_BYTES, DEF_TLS_DAEMON_RAND_BYTES, &var_tls_daemon_rand_bytes, 1, 0,
+	0,
+    };
+
+    /* If this changes, update TLS_CLIENT_PARAMS in tls_proxy.h. */
+    static const CONFIG_BOOL_TABLE bool_table[] = {
+	VAR_TLS_APPEND_DEF_CA, DEF_TLS_APPEND_DEF_CA, &var_tls_append_def_CA,
+	VAR_TLS_BC_PKEY_FPRINT, DEF_TLS_BC_PKEY_FPRINT, &var_tls_bc_pkey_fprint,
+	VAR_TLS_PREEMPT_CLIST, DEF_TLS_PREEMPT_CLIST, &var_tls_preempt_clist,
+	VAR_TLS_MULTI_WILDCARD, DEF_TLS_MULTI_WILDCARD, &var_tls_multi_wildcard,
+	VAR_TLS_FAST_SHUTDOWN, DEF_TLS_FAST_SHUTDOWN, &var_tls_fast_shutdown,
+	0,
+    };
+    static int init_done;
+
+    if (init_done)
+	return;
+    init_done = 1;
+
+    get_mail_conf_str_table(str_table);
+    get_mail_conf_int_table(int_table);
+    get_mail_conf_bool_table(bool_table);
+}
+
+/* tls_pre_jail_init - Load TLS related pre-jail tables */
+
+void    tls_pre_jail_init(TLS_ROLE role)
+{
+    static const CONFIG_STR_TABLE str_table[] = {
+	VAR_TLS_SERVER_SNI_MAPS, DEF_TLS_SERVER_SNI_MAPS, &var_tls_server_sni_maps, 0, 0,
+	0,
+    };
+    int     flags;
+
+    tls_param_init();
+
+    /* Nothing for clients at this time */
+    if (role != TLS_ROLE_SERVER)
+	return;
+
+    get_mail_conf_str_table(str_table);
+    if (*var_tls_server_sni_maps == 0)
+	return;
+
+    flags = DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX | DICT_FLAG_SRC_RHS_IS_FILE;
+    tls_server_sni_maps =
+	maps_create(VAR_TLS_SERVER_SNI_MAPS, var_tls_server_sni_maps, flags);
+}
+
+/* server_sni_callback - process client's SNI extension */
+
+static int server_sni_callback(SSL *ssl, int *alert, void *arg)
+{
+    SSL_CTX *sni_ctx = (SSL_CTX *) arg;
+    TLS_SESS_STATE *TLScontext = SSL_get_ex_data(ssl, TLScontext_index);
+    const char *sni = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
+    const char *cp = sni;
+    const char *pem;
+
+    /* SNI is silently ignored when we don't care or is NULL or empty */
+    if (!sni_ctx || !tls_server_sni_maps || !sni || !*sni)
+	return SSL_TLSEXT_ERR_NOACK;
+
+    if (!valid_hostname(sni, DONT_GRIPE)) {
+	msg_warn("TLS SNI from %s is invalid: %s",
+		 TLScontext->namaddr, sni);
+	return SSL_TLSEXT_ERR_NOACK;
+    }
+
+    /*
+     * With TLS 1.3, when the client's proposed key share is not supported by
+     * the server, the server may issue a HelloRetryRequest (HRR), and the
+     * client will then retry with a new key share on a curve supported by
+     * the server.  This results in the SNI callback running twice for the
+     * same connection.
+     * 
+     * When that happens, The client MUST send the essentially the same hello
+     * message, including the SNI name, and since we've already loaded our
+     * certificate chain, we don't need to do it again!  Therefore, if we've
+     * already recorded the peer SNI name, just check that it has not
+     * changed, and return success.
+     */
+    if (TLScontext->peer_sni) {
+	if (strcmp(sni, TLScontext->peer_sni) == 0)
+	    return SSL_TLSEXT_ERR_OK;
+	msg_warn("TLS SNI changed from %s initially %s, %s after hello retry",
+		 TLScontext->namaddr, TLScontext->peer_sni, sni);
+	return SSL_TLSEXT_ERR_NOACK;
+    }
+    do {
+	/* Don't silently skip maps opened with the wrong flags. */
+	pem = maps_file_find(tls_server_sni_maps, cp, 0);
+    } while (!pem
+	     && !tls_server_sni_maps->error
+	     && (cp = strchr(cp + 1, '.')) != 0);
+
+    if (!pem) {
+	if (tls_server_sni_maps->error) {
+	    msg_warn("%s: %s map lookup problem",
+		     tls_server_sni_maps->title, sni);
+	    *alert = SSL_AD_INTERNAL_ERROR;
+	    return SSL_TLSEXT_ERR_ALERT_FATAL;
+	}
+	msg_info("TLS SNI %s from %s not matched, using default chain",
+		 sni, TLScontext->namaddr);
+
+	/*
+	 * XXX: We could lie and pretend to accept the name, but since we've
+	 * previously not implemented the callback (with OpenSSL then
+	 * declining the extension), and nothing bad happened, declining it
+	 * explicitly should be safe.
+	 */
+	return SSL_TLSEXT_ERR_NOACK;
+    }
+    SSL_set_SSL_CTX(ssl, sni_ctx);
+    if (tls_load_pem_chain(ssl, pem, sni) != 0) {
+	/* errors already logged */
+	*alert = SSL_AD_INTERNAL_ERROR;
+	return SSL_TLSEXT_ERR_ALERT_FATAL;
+    }
+    TLScontext->peer_sni = mystrdup(sni);
+    return SSL_TLSEXT_ERR_OK;
+}
+
+/* tls_set_ciphers - Set SSL context cipher list */
+
+const char *tls_set_ciphers(TLS_SESS_STATE *TLScontext, const char *grade,
+			            const char *exclusions)
+{
+    const char *myname = "tls_set_ciphers";
+    static VSTRING *buf;
+    char   *save;
+    char   *cp;
+    char   *tok;
+
+    if (buf == 0)
+	buf = vstring_alloc(10);
+    VSTRING_RESET(buf);
+
+    switch (tls_cipher_grade(grade)) {
+    case TLS_CIPHER_NONE:
+	msg_warn("%s: invalid cipher grade: \"%s\"",
+		 TLScontext->namaddr, grade);
+	return (0);
+    case TLS_CIPHER_HIGH:
+	vstring_strcpy(buf, var_tls_high_clist);
+	break;
+    case TLS_CIPHER_MEDIUM:
+	vstring_strcpy(buf, var_tls_medium_clist);
+	break;
+    case TLS_CIPHER_LOW:
+	vstring_strcpy(buf, var_tls_low_clist);
+	break;
+    case TLS_CIPHER_EXPORT:
+	vstring_strcpy(buf, var_tls_export_clist);
+	break;
+    case TLS_CIPHER_NULL:
+	vstring_strcpy(buf, var_tls_null_clist);
+	break;
+    default:
+	/* Internal error, valid grade, but missing case label. */
+	msg_panic("%s: unexpected cipher grade: %s", myname, grade);
+    }
+
+    /*
+     * The base lists for each grade can't be empty.
+     */
+    if (VSTRING_LEN(buf) == 0)
+	msg_panic("%s: empty \"%s\" cipherlist", myname, grade);
+
+    /*
+     * Apply locally-specified exclusions.
+     */
+#define CIPHER_SEP CHARS_COMMA_SP ":"
+    if (exclusions != 0) {
+	cp = save = mystrdup(exclusions);
+	while ((tok = mystrtok(&cp, CIPHER_SEP)) != 0) {
+
+	    /*
+	     * Can't exclude ciphers that start with modifiers.
+	     */
+	    if (strchr("!+-@", *tok)) {
+		msg_warn("%s: invalid unary '!+-@' in cipher exclusion: %s",
+			 TLScontext->namaddr, tok);
+		return (0);
+	    }
+	    vstring_sprintf_append(buf, ":!%s", tok);
+	}
+	myfree(save);
+    }
+    ERR_clear_error();
+    if (SSL_set_cipher_list(TLScontext->con, vstring_str(buf)) == 0) {
+	msg_warn("%s: error setting cipher grade: \"%s\"",
+		 TLScontext->namaddr, grade);
+	tls_print_errors();
+	return (0);
+    }
+    return (vstring_str(buf));
+}
+
+/* tls_get_signature_params - TLS 1.3 signature details */
+
+void    tls_get_signature_params(TLS_SESS_STATE *TLScontext)
+{
+#if OPENSSL_VERSION_NUMBER >= 0x1010100fUL && defined(TLS1_3_VERSION)
+    const char *kex_name = 0;
+    const char *kex_curve = 0;
+    const char *locl_sig_name = 0;
+    const char *locl_sig_curve = 0;
+    const char *locl_sig_dgst = 0;
+    const char *peer_sig_name = 0;
+    const char *peer_sig_curve = 0;
+    const char *peer_sig_dgst = 0;
+    int     nid;
+    int     got_kex_key;
+    SSL    *ssl = TLScontext->con;
+    int     srvr = SSL_is_server(ssl);
+    X509   *cert;
+    EVP_PKEY *pkey = 0;
+
+#ifndef OPENSSL_NO_EC
+    const EC_KEY *eckey;
+
+#endif
+
+#define SIG_PROP(c, s, p) (*((s) ? &c->srvr_sig_##p : &c->clnt_sig_##p))
+
+    if (SSL_version(ssl) < TLS1_3_VERSION)
+	return;
+
+    if (tls_get_peer_dh_pubkey(ssl, &pkey)) {
+	switch (nid = EVP_PKEY_id(pkey)) {
+	default:
+	    kex_name = OBJ_nid2sn(EVP_PKEY_type(nid));
+	    break;
+
+	case EVP_PKEY_DH:
+	    kex_name = "DHE";
+	    TLScontext->kex_bits = EVP_PKEY_bits(pkey);
+	    break;
+
+#ifndef OPENSSL_NO_EC
+	case EVP_PKEY_EC:
+	    kex_name = "ECDHE";
+	    eckey = EVP_PKEY_get0_EC_KEY(pkey);
+	    nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(eckey));
+	    kex_curve = EC_curve_nid2nist(nid);
+	    if (!kex_curve)
+		kex_curve = OBJ_nid2sn(nid);
+	    break;
+#endif
+	}
+	EVP_PKEY_free(pkey);
+    }
+
+    /*
+     * On the client end, the certificate may be preset, but not used, so we
+     * check via SSL_get_signature_nid().  This means that local signature
+     * data on clients requires at least 1.1.1a.
+     */
+    if (srvr || SSL_get_signature_nid(ssl, &nid))
+	cert = SSL_get_certificate(ssl);
+    else
+	cert = 0;
+
+    /* Signature algorithms for the local end of the connection */
+    if (cert) {
+	pkey = X509_get0_pubkey(cert);
+
+	/*
+	 * Override the built-in name for the "ECDSA" algorithms OID, with
+	 * the more familiar name.  For "RSA" keys report "RSA-PSS", which
+	 * must be used with TLS 1.3.
+	 */
+	if ((nid = EVP_PKEY_type(EVP_PKEY_id(pkey))) != NID_undef) {
+	    switch (nid) {
+	    default:
+		locl_sig_name = OBJ_nid2sn(nid);
+		break;
+
+	    case EVP_PKEY_RSA:
+		/* For RSA, TLS 1.3 mandates PSS signatures */
+		locl_sig_name = "RSA-PSS";
+		SIG_PROP(TLScontext, srvr, bits) = EVP_PKEY_bits(pkey);
+		break;
+
+#ifndef OPENSSL_NO_EC
+	    case EVP_PKEY_EC:
+		locl_sig_name = "ECDSA";
+		eckey = EVP_PKEY_get0_EC_KEY(pkey);
+		nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(eckey));
+		locl_sig_curve = EC_curve_nid2nist(nid);
+		if (!locl_sig_curve)
+		    locl_sig_curve = OBJ_nid2sn(nid);
+		break;
+#endif
+	    }
+	}
+
+	/*
+	 * With Ed25519 and Ed448 there is no pre-signature digest, but the
+	 * accessor does not fail, rather we get NID_undef.
+	 */
+	if (SSL_get_signature_nid(ssl, &nid) && nid != NID_undef)
+	    locl_sig_dgst = OBJ_nid2sn(nid);
+    }
+    /* Signature algorithms for the peer end of the connection */
+    if ((cert = SSL_get_peer_certificate(ssl)) != 0) {
+	pkey = X509_get0_pubkey(cert);
+
+	/*
+	 * Override the built-in name for the "ECDSA" algorithms OID, with
+	 * the more familiar name.  For "RSA" keys report "RSA-PSS", which
+	 * must be used with TLS 1.3.
+	 */
+	if ((nid = EVP_PKEY_type(EVP_PKEY_id(pkey))) != NID_undef) {
+	    switch (nid) {
+	    default:
+		peer_sig_name = OBJ_nid2sn(nid);
+		break;
+
+	    case EVP_PKEY_RSA:
+		/* For RSA, TLS 1.3 mandates PSS signatures */
+		peer_sig_name = "RSA-PSS";
+		SIG_PROP(TLScontext, !srvr, bits) = EVP_PKEY_bits(pkey);
+		break;
+
+#ifndef OPENSSL_NO_EC
+	    case EVP_PKEY_EC:
+		peer_sig_name = "ECDSA";
+		eckey = EVP_PKEY_get0_EC_KEY(pkey);
+		nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(eckey));
+		peer_sig_curve = EC_curve_nid2nist(nid);
+		if (!peer_sig_curve)
+		    peer_sig_curve = OBJ_nid2sn(nid);
+		break;
+#endif
+	    }
+	}
+
+	/*
+	 * With Ed25519 and Ed448 there is no pre-signature digest, but the
+	 * accessor does not fail, rather we get NID_undef.
+	 */
+	if (SSL_get_peer_signature_nid(ssl, &nid) && nid != NID_undef)
+	    peer_sig_dgst = OBJ_nid2sn(nid);
+
+	X509_free(cert);
+    }
+    if (kex_name) {
+	TLScontext->kex_name = mystrdup(kex_name);
+	if (kex_curve)
+	    TLScontext->kex_curve = mystrdup(kex_curve);
+    }
+    if (locl_sig_name) {
+	SIG_PROP(TLScontext, srvr, name) = mystrdup(locl_sig_name);
+	if (locl_sig_curve)
+	    SIG_PROP(TLScontext, srvr, curve) = mystrdup(locl_sig_curve);
+	if (locl_sig_dgst)
+	    SIG_PROP(TLScontext, srvr, dgst) = mystrdup(locl_sig_dgst);
+    }
+    if (peer_sig_name) {
+	SIG_PROP(TLScontext, !srvr, name) = mystrdup(peer_sig_name);
+	if (peer_sig_curve)
+	    SIG_PROP(TLScontext, !srvr, curve) = mystrdup(peer_sig_curve);
+	if (peer_sig_dgst)
+	    SIG_PROP(TLScontext, !srvr, dgst) = mystrdup(peer_sig_dgst);
+    }
+#endif						/* OPENSSL_VERSION_NUMBER ... */
+}
+
+/* tls_log_summary - TLS loglevel 1 one-liner, embellished with TLS 1.3 details */
+
+void    tls_log_summary(TLS_ROLE role, TLS_USAGE usage, TLS_SESS_STATE *ctx)
+{
+    VSTRING *msg = vstring_alloc(100);
+    const char *direction = (role == TLS_ROLE_CLIENT) ? "to" : "from";
+    const char *sni = (role == TLS_ROLE_CLIENT) ? 0 : ctx->peer_sni;
+
+    /*
+     * When SNI was sent and accepted, the server-side log message now
+     * includes a "to <sni-name>" detail after the "from <namaddr>" detail
+     * identifying the remote client.  We don't presently log (purportedly)
+     * accepted SNI on the client side.
+     */
+    vstring_sprintf(msg, "%s TLS connection %s %s %s%s%s: %s"
+		    " with cipher %s (%d/%d bits)",
+		    !TLS_CERT_IS_PRESENT(ctx) ? "Anonymous" :
+		    TLS_CERT_IS_SECURED(ctx) ? "Verified" :
+		    TLS_CERT_IS_TRUSTED(ctx) ? "Trusted" : "Untrusted",
+		    usage == TLS_USAGE_NEW ? "established" : "reused",
+		 direction, ctx->namaddr, sni ? " to " : "", sni ? sni : "",
+		    ctx->protocol, ctx->cipher_name, ctx->cipher_usebits,
+		    ctx->cipher_algbits);
+
+    if (ctx->kex_name && *ctx->kex_name) {
+	vstring_sprintf_append(msg, " key-exchange %s", ctx->kex_name);
+	if (ctx->kex_curve && *ctx->kex_curve)
+	    vstring_sprintf_append(msg, " (%s)", ctx->kex_curve);
+	else if (ctx->kex_bits > 0)
+	    vstring_sprintf_append(msg, " (%d bits)", ctx->kex_bits);
+    }
+    if (ctx->srvr_sig_name && *ctx->srvr_sig_name) {
+	vstring_sprintf_append(msg, " server-signature %s",
+			       ctx->srvr_sig_name);
+	if (ctx->srvr_sig_curve && *ctx->srvr_sig_curve)
+	    vstring_sprintf_append(msg, " (%s)", ctx->srvr_sig_curve);
+	else if (ctx->srvr_sig_bits > 0)
+	    vstring_sprintf_append(msg, " (%d bits)", ctx->srvr_sig_bits);
+	if (ctx->srvr_sig_dgst && *ctx->srvr_sig_dgst)
+	    vstring_sprintf_append(msg, " server-digest %s",
+				   ctx->srvr_sig_dgst);
+    }
+    if (ctx->clnt_sig_name && *ctx->clnt_sig_name) {
+	vstring_sprintf_append(msg, " client-signature %s",
+			       ctx->clnt_sig_name);
+	if (ctx->clnt_sig_curve && *ctx->clnt_sig_curve)
+	    vstring_sprintf_append(msg, " (%s)", ctx->clnt_sig_curve);
+	else if (ctx->clnt_sig_bits > 0)
+	    vstring_sprintf_append(msg, " (%d bits)", ctx->clnt_sig_bits);
+	if (ctx->clnt_sig_dgst && *ctx->clnt_sig_dgst)
+	    vstring_sprintf_append(msg, " client-digest %s",
+				   ctx->clnt_sig_dgst);
+    }
+    msg_info("%s", vstring_str(msg));
+    vstring_free(msg);
+}
+
+/* tls_alloc_app_context - allocate TLS application context */
+
+TLS_APPL_STATE *tls_alloc_app_context(SSL_CTX *ssl_ctx, SSL_CTX *sni_ctx,
+				              int log_mask)
+{
+    TLS_APPL_STATE *app_ctx;
+
+    app_ctx = (TLS_APPL_STATE *) mymalloc(sizeof(*app_ctx));
+
+    /* See portability note below with other memset() call. */
+    memset((void *) app_ctx, 0, sizeof(*app_ctx));
+    app_ctx->ssl_ctx = ssl_ctx;
+    app_ctx->sni_ctx = sni_ctx;
+    app_ctx->log_mask = log_mask;
+
+    /* See also: cache purging code in tls_set_ciphers(). */
+    app_ctx->cache_type = 0;
+
+    if (tls_server_sni_maps) {
+	SSL_CTX_set_tlsext_servername_callback(ssl_ctx, server_sni_callback);
+	SSL_CTX_set_tlsext_servername_arg(ssl_ctx, (void *) sni_ctx);
+    }
+    return (app_ctx);
+}
+
+/* tls_free_app_context - Free TLS application context */
+
+void    tls_free_app_context(TLS_APPL_STATE *app_ctx)
+{
+    if (app_ctx->ssl_ctx)
+	SSL_CTX_free(app_ctx->ssl_ctx);
+    if (app_ctx->sni_ctx)
+	SSL_CTX_free(app_ctx->sni_ctx);
+    if (app_ctx->cache_type)
+	myfree(app_ctx->cache_type);
+    myfree((void *) app_ctx);
+}
+
+/* tls_alloc_sess_context - allocate TLS session context */
+
+TLS_SESS_STATE *tls_alloc_sess_context(int log_mask, const char *namaddr)
+{
+    TLS_SESS_STATE *TLScontext;
+
+    /*
+     * PORTABILITY: Do not assume that null pointers are all-zero bits. Use
+     * explicit assignments to initialize pointers.
+     * 
+     * See the C language FAQ item 5.17, or if you have time to burn,
+     * http://www.google.com/search?q=zero+bit+null+pointer
+     * 
+     * However, it's OK to use memset() to zero integer values.
+     */
+    TLScontext = (TLS_SESS_STATE *) mymalloc(sizeof(TLS_SESS_STATE));
+    memset((void *) TLScontext, 0, sizeof(*TLScontext));
+    TLScontext->con = 0;
+    TLScontext->cache_type = 0;
+    TLScontext->serverid = 0;
+    TLScontext->peer_CN = 0;
+    TLScontext->issuer_CN = 0;
+    TLScontext->peer_sni = 0;
+    TLScontext->peer_cert_fprint = 0;
+    TLScontext->peer_pkey_fprint = 0;
+    TLScontext->protocol = 0;
+    TLScontext->cipher_name = 0;
+    TLScontext->kex_name = 0;
+    TLScontext->kex_curve = 0;
+    TLScontext->clnt_sig_name = 0;
+    TLScontext->clnt_sig_curve = 0;
+    TLScontext->clnt_sig_dgst = 0;
+    TLScontext->srvr_sig_name = 0;
+    TLScontext->srvr_sig_curve = 0;
+    TLScontext->srvr_sig_dgst = 0;
+    TLScontext->log_mask = log_mask;
+    TLScontext->namaddr = lowercase(mystrdup(namaddr));
+    TLScontext->mdalg = 0;			/* Alias for props->mdalg */
+    TLScontext->dane = 0;			/* Alias for props->dane */
+    TLScontext->errordepth = -1;
+    TLScontext->tadepth = -1;
+    TLScontext->errorcode = X509_V_OK;
+    TLScontext->errorcert = 0;
+    TLScontext->untrusted = 0;
+    TLScontext->trusted = 0;
+
+    return (TLScontext);
+}
+
+/* tls_free_context - deallocate TLScontext and members */
+
+void    tls_free_context(TLS_SESS_STATE *TLScontext)
+{
+
+    /*
+     * Free the SSL structure and the BIOs. Warning: the internal_bio is
+     * connected to the SSL structure and is automatically freed with it. Do
+     * not free it again (core dump)!! Only free the network_bio.
+     */
+    if (TLScontext->con != 0)
+	SSL_free(TLScontext->con);
+
+    if (TLScontext->namaddr)
+	myfree(TLScontext->namaddr);
+    if (TLScontext->serverid)
+	myfree(TLScontext->serverid);
+
+    if (TLScontext->peer_CN)
+	myfree(TLScontext->peer_CN);
+    if (TLScontext->issuer_CN)
+	myfree(TLScontext->issuer_CN);
+    if (TLScontext->peer_sni)
+	myfree(TLScontext->peer_sni);
+    if (TLScontext->peer_cert_fprint)
+	myfree(TLScontext->peer_cert_fprint);
+    if (TLScontext->peer_pkey_fprint)
+	myfree(TLScontext->peer_pkey_fprint);
+    if (TLScontext->kex_name)
+	myfree((void *) TLScontext->kex_name);
+    if (TLScontext->kex_curve)
+	myfree((void *) TLScontext->kex_curve);
+    if (TLScontext->clnt_sig_name)
+	myfree((void *) TLScontext->clnt_sig_name);
+    if (TLScontext->clnt_sig_curve)
+	myfree((void *) TLScontext->clnt_sig_curve);
+    if (TLScontext->clnt_sig_dgst)
+	myfree((void *) TLScontext->clnt_sig_dgst);
+    if (TLScontext->srvr_sig_name)
+	myfree((void *) TLScontext->srvr_sig_name);
+    if (TLScontext->srvr_sig_curve)
+	myfree((void *) TLScontext->srvr_sig_curve);
+    if (TLScontext->srvr_sig_dgst)
+	myfree((void *) TLScontext->srvr_sig_dgst);
+    if (TLScontext->errorcert)
+	X509_free(TLScontext->errorcert);
+    if (TLScontext->untrusted)
+	sk_X509_pop_free(TLScontext->untrusted, X509_free);
+    if (TLScontext->trusted)
+	sk_X509_pop_free(TLScontext->trusted, X509_free);
+
+    myfree((void *) TLScontext);
+}
+
+/* tls_version_split - Split OpenSSL version number into major, minor, ... */
+
+static void tls_version_split(unsigned long version, TLS_VINFO *info)
+{
+
+    /*
+     * OPENSSL_VERSION_NUMBER(3):
+     * 
+     * OPENSSL_VERSION_NUMBER is a numeric release version identifier:
+     * 
+     * MMNNFFPPS: major minor fix patch status
+     * 
+     * The status nibble has one of the values 0 for development, 1 to e for
+     * betas 1 to 14, and f for release. Parsed OpenSSL version number. for
+     * example
+     * 
+     * 0x000906000 == 0.9.6 dev 0x000906023 == 0.9.6b beta 3 0x00090605f ==
+     * 0.9.6e release
+     * 
+     * Versions prior to 0.9.3 have identifiers < 0x0930.  Versions between
+     * 0.9.3 and 0.9.5 had a version identifier with this interpretation:
+     * 
+     * MMNNFFRBB major minor fix final beta/patch
+     * 
+     * for example
+     * 
+     * 0x000904100 == 0.9.4 release 0x000905000 == 0.9.5 dev
+     * 
+     * Version 0.9.5a had an interim interpretation that is like the current
+     * one, except the patch level got the highest bit set, to keep continu-
+     * ity.  The number was therefore 0x0090581f.
+     */
+
+    if (version < 0x0930) {
+	info->status = 0;
+	info->patch = version & 0x0f;
+	version >>= 4;
+	info->micro = version & 0x0f;
+	version >>= 4;
+	info->minor = version & 0x0f;
+	version >>= 4;
+	info->major = version & 0x0f;
+    } else if (version < 0x00905800L) {
+	info->patch = version & 0xff;
+	version >>= 8;
+	info->status = version & 0xf;
+	version >>= 4;
+	info->micro = version & 0xff;
+	version >>= 8;
+	info->minor = version & 0xff;
+	version >>= 8;
+	info->major = version & 0xff;
+    } else {
+	info->status = version & 0xf;
+	version >>= 4;
+	info->patch = version & 0xff;
+	version >>= 8;
+	info->micro = version & 0xff;
+	version >>= 8;
+	info->minor = version & 0xff;
+	version >>= 8;
+	info->major = version & 0xff;
+	if (version < 0x00906000L)
+	    info->patch &= ~0x80;
+    }
+}
+
+/* tls_check_version - Detect mismatch between headers and library. */
+
+void    tls_check_version(void)
+{
+    TLS_VINFO hdr_info;
+    TLS_VINFO lib_info;
+
+    tls_version_split(OPENSSL_VERSION_NUMBER, &hdr_info);
+    tls_version_split(OpenSSL_version_num(), &lib_info);
+
+    /*
+     * Warn if run-time library is different from compile-time library,
+     * allowing later run-time "micro" versions starting with 1.1.0.
+     */
+    if (lib_info.major != hdr_info.major
+	|| lib_info.minor != hdr_info.minor
+	|| (lib_info.micro != hdr_info.micro
+	    && (lib_info.micro < hdr_info.micro
+		|| hdr_info.major == 0
+		|| (hdr_info.major == 1 && hdr_info.minor == 0))))
+	msg_warn("run-time library vs. compile-time header version mismatch: "
+	     "OpenSSL %d.%d.%d may not be compatible with OpenSSL %d.%d.%d",
+		 lib_info.major, lib_info.minor, lib_info.micro,
+		 hdr_info.major, hdr_info.minor, hdr_info.micro);
+}
+
+/* tls_compile_version - compile-time OpenSSL version */
+
+const char *tls_compile_version(void)
+{
+    return (OPENSSL_VERSION_TEXT);
+}
+
+/* tls_run_version - run-time version "major.minor.micro" */
+
+const char *tls_run_version(void)
+{
+    return (OpenSSL_version(OPENSSL_VERSION));
+}
+
+const char **tls_pkey_algorithms(void)
+{
+
+    /*
+     * Return an array, not string, so that the result can be inspected
+     * without parsing. Sort the result alphabetically, not chronologically.
+     */
+    static const char *algs[] = {
+#ifndef OPENSSL_NO_DSA
+	"dsa",
+#endif
+#ifndef OPENSSL_NO_ECDSA
+	"ecdsa",
+#endif
+#ifndef OPENSSL_NO_RSA
+	"rsa",
+#endif
+	0,
+    };
+
+    return (algs);
+}
+
+/* tls_bug_bits - SSL bug compatibility bits for this OpenSSL version */
+
+long    tls_bug_bits(void)
+{
+    long    bits = SSL_OP_ALL;		/* Work around all known bugs */
+
+    /*
+     * Silently ignore any strings that don't appear in the tweaks table, or
+     * hex bits that are not in SSL_OP_ALL.
+     */
+    if (*var_tls_bug_tweaks) {
+	bits &= ~long_name_mask_opt(VAR_TLS_BUG_TWEAKS, ssl_bug_tweaks,
+				    var_tls_bug_tweaks, NAME_MASK_ANY_CASE |
+				    NAME_MASK_NUMBER | NAME_MASK_WARN);
+#ifdef SSL_OP_SAFARI_ECDHE_ECDSA_BUG
+	/* Not relevant to SMTP */
+	bits &= ~SSL_OP_SAFARI_ECDHE_ECDSA_BUG;
+#endif
+    }
+
+    /*
+     * Allow users to set options not in SSL_OP_ALL, and not already managed
+     * via other Postfix parameters.
+     */
+    if (*var_tls_ssl_options) {
+	long    enable;
+
+	enable = long_name_mask_opt(VAR_TLS_SSL_OPTIONS, ssl_op_tweaks,
+				    var_tls_ssl_options, NAME_MASK_ANY_CASE |
+				    NAME_MASK_NUMBER | NAME_MASK_WARN);
+	enable &= ~(SSL_OP_ALL | TLS_SSL_OP_MANAGED_BITS);
+	bits |= enable;
+    }
+
+    /*
+     * We unconditionally avoid re-use of ephemeral keys, note that we set DH
+     * keys via a callback, so reuse was never possible, but the ECDH key is
+     * set statically, so that is potentially subject to reuse.  Set both
+     * options just in case.
+     */
+    bits |= SSL_OP_SINGLE_ECDH_USE | SSL_OP_SINGLE_DH_USE;
+    return (bits);
+}
+
+/* tls_print_errors - print and clear the error stack */
+
+void    tls_print_errors(void)
+{
+    unsigned long err;
+    char    buffer[1024];		/* XXX */
+    const char *file;
+    const char *data;
+    int     line;
+    int     flags;
+
+    while ((err = ERR_get_error_line_data(&file, &line, &data, &flags)) != 0) {
+	ERR_error_string_n(err, buffer, sizeof(buffer));
+	if (flags & ERR_TXT_STRING)
+	    msg_warn("TLS library problem: %s:%s:%d:%s:",
+		     buffer, file, line, data);
+	else
+	    msg_warn("TLS library problem: %s:%s:%d:", buffer, file, line);
+    }
+}
+
+/* tls_info_callback - callback for logging SSL events via Postfix */
+
+void    tls_info_callback(const SSL *s, int where, int ret)
+{
+    char   *str;
+    int     w;
+
+    /* Adapted from OpenSSL apps/s_cb.c. */
+
+    w = where & ~SSL_ST_MASK;
+
+    if (w & SSL_ST_CONNECT)
+	str = "SSL_connect";
+    else if (w & SSL_ST_ACCEPT)
+	str = "SSL_accept";
+    else
+	str = "unknown";
+
+    if (where & SSL_CB_LOOP) {
+	msg_info("%s:%s", str, SSL_state_string_long((SSL *) s));
+    } else if (where & SSL_CB_ALERT) {
+	str = (where & SSL_CB_READ) ? "read" : "write";
+	if ((ret & 0xff) != SSL3_AD_CLOSE_NOTIFY)
+	    msg_info("SSL3 alert %s:%s:%s", str,
+		     SSL_alert_type_string_long(ret),
+		     SSL_alert_desc_string_long(ret));
+    } else if (where & SSL_CB_EXIT) {
+	if (ret == 0)
+	    msg_info("%s:failed in %s",
+		     str, SSL_state_string_long((SSL *) s));
+	else if (ret < 0) {
+#ifndef LOG_NON_ERROR_STATES
+	    switch (SSL_get_error((SSL *) s, ret)) {
+	    case SSL_ERROR_WANT_READ:
+	    case SSL_ERROR_WANT_WRITE:
+		/* Don't log non-error states. */
+		break;
+	    default:
+#endif
+		msg_info("%s:error in %s",
+			 str, SSL_state_string_long((SSL *) s));
+#ifndef LOG_NON_ERROR_STATES
+	    }
+#endif
+	}
+    }
+}
+
+ /*
+  * taken from OpenSSL crypto/bio/b_dump.c.
+  * 
+  * Modified to save a lot of strcpy and strcat by Matti Aarnio.
+  * 
+  * Rewritten by Wietse to elimate fixed-size stack buffer, array index
+  * multiplication and division, sprintf() and strcpy(), and lots of strlen()
+  * calls. We could make it a little faster by using a fixed-size stack-based
+  * buffer.
+  * 
+  * 200412 - use %lx to print pointers, after casting them to unsigned long.
+  */
+
+#define TRUNCATE_SPACE_NULL
+#define DUMP_WIDTH	16
+#define VERT_SPLIT	7
+
+static void tls_dump_buffer(const unsigned char *start, int len)
+{
+    VSTRING *buf = vstring_alloc(100);
+    const unsigned char *last = start + len - 1;
+    const unsigned char *row;
+    const unsigned char *col;
+    int     ch;
+
+#ifdef TRUNCATE_SPACE_NULL
+    while (last >= start && (*last == ' ' || *last == 0))
+	last--;
+#endif
+
+    for (row = start; row <= last; row += DUMP_WIDTH) {
+	VSTRING_RESET(buf);
+	vstring_sprintf(buf, "%04lx ", (unsigned long) (row - start));
+	for (col = row; col < row + DUMP_WIDTH; col++) {
+	    if (col > last) {
+		vstring_strcat(buf, "   ");
+	    } else {
+		ch = *col;
+		vstring_sprintf_append(buf, "%02x%c",
+				   ch, col - row == VERT_SPLIT ? '|' : ' ');
+	    }
+	}
+	VSTRING_ADDCH(buf, ' ');
+	for (col = row; col < row + DUMP_WIDTH; col++) {
+	    if (col > last)
+		break;
+	    ch = *col;
+	    if (!ISPRINT(ch))
+		ch = '.';
+	    VSTRING_ADDCH(buf, ch);
+	    if (col - row == VERT_SPLIT)
+		VSTRING_ADDCH(buf, ' ');
+	}
+	VSTRING_TERMINATE(buf);
+	msg_info("%s", vstring_str(buf));
+    }
+#ifdef TRUNCATE_SPACE_NULL
+    if ((last + 1) - start < len)
+	msg_info("%04lx - <SPACES/NULLS>",
+		 (unsigned long) ((last + 1) - start));
+#endif
+    vstring_free(buf);
+}
+
+/* taken from OpenSSL apps/s_cb.c */
+
+long    tls_bio_dump_cb(BIO *bio, int cmd, const char *argp, int argi,
+			        long unused_argl, long ret)
+{
+    if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
+	msg_info("read from %08lX [%08lX] (%d bytes => %ld (0x%lX))",
+		 (unsigned long) bio, (unsigned long) argp, argi,
+		 ret, (unsigned long) ret);
+	tls_dump_buffer((unsigned char *) argp, (int) ret);
+    } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
+	msg_info("write to %08lX [%08lX] (%d bytes => %ld (0x%lX))",
+		 (unsigned long) bio, (unsigned long) argp, argi,
+		 ret, (unsigned long) ret);
+	tls_dump_buffer((unsigned char *) argp, (int) ret);
+    }
+    return (ret);
+}
+
+int     tls_validate_digest(const char *dgst)
+{
+    const EVP_MD *md_alg;
+    unsigned int md_len;
+
+    /*
+     * Register SHA-2 digests, if implemented and not already registered.
+     * Improves interoperability with clients and servers that prematurely
+     * deploy SHA-2 certificates.  Also facilitates DANE and TA support.
+     */
+#if defined(LN_sha256) && defined(NID_sha256) && !defined(OPENSSL_NO_SHA256)
+    if (!EVP_get_digestbyname(LN_sha224))
+	EVP_add_digest(EVP_sha224());
+    if (!EVP_get_digestbyname(LN_sha256))
+	EVP_add_digest(EVP_sha256());
+#endif
+#if defined(LN_sha512) && defined(NID_sha512) && !defined(OPENSSL_NO_SHA512)
+    if (!EVP_get_digestbyname(LN_sha384))
+	EVP_add_digest(EVP_sha384());
+    if (!EVP_get_digestbyname(LN_sha512))
+	EVP_add_digest(EVP_sha512());
+#endif
+
+    /*
+     * If the administrator specifies an unsupported digest algorithm, fail
+     * now, rather than in the middle of a TLS handshake.
+     */
+    if ((md_alg = EVP_get_digestbyname(dgst)) == 0) {
+	msg_warn("Digest algorithm \"%s\" not found", dgst);
+	return (0);
+    }
+
+    /*
+     * Sanity check: Newer shared libraries may use larger digests.
+     */
+    if ((md_len = EVP_MD_size(md_alg)) > EVP_MAX_MD_SIZE) {
+	msg_warn("Digest algorithm \"%s\" output size %u too large",
+		 dgst, md_len);
+	return (0);
+    }
+    return (1);
+}
+
+#else
+
+ /*
+  * Broken linker workaround.
+  */
+int     tls_dummy_for_broken_linkers;
+
+#endif