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-rw-r--r--src/tls/tls_misc.c1566
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diff --git a/src/tls/tls_misc.c b/src/tls/tls_misc.c
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@@ -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