/*++ /* NAME /* tls_server 3 /* SUMMARY /* server-side TLS engine /* SYNOPSIS /* #include <tls.h> /* /* TLS_APPL_STATE *tls_server_init(props) /* const TLS_SERVER_INIT_PROPS *props; /* /* TLS_SESS_STATE *tls_server_start(props) /* const TLS_SERVER_START_PROPS *props; /* /* TLS_SESS_STATE *tls_server_post_accept(TLScontext) /* TLS_SESS_STATE *TLScontext; /* /* void tls_server_stop(app_ctx, stream, failure, TLScontext) /* TLS_APPL_STATE *app_ctx; /* VSTREAM *stream; /* int failure; /* TLS_SESS_STATE *TLScontext; /* DESCRIPTION /* This module is the interface between Postfix TLS servers, /* the OpenSSL library, and the TLS entropy and cache manager. /* /* See "EVENT_DRIVEN APPLICATIONS" below for using this code /* in event-driven programs. /* /* tls_server_init() is called once when the SMTP server /* initializes. /* Certificate details are also decided during this phase, /* so that peer-specific behavior is not possible. /* /* tls_server_start() activates the TLS feature for the VSTREAM /* passed as argument. We assume that network buffers are flushed /* and the TLS handshake can begin immediately. /* /* tls_server_stop() sends the "close notify" alert via /* SSL_shutdown() to the peer and resets all connection specific /* TLS data. As RFC2487 does not specify a separate shutdown, it /* is assumed that the underlying TCP connection is shut down /* immediately afterwards. Any further writes to the channel will /* be discarded, and any further reads will report end-of-file. /* If the failure flag is set, no SSL_shutdown() handshake is performed. /* /* Once the TLS connection is initiated, information about the TLS /* state is available via the TLScontext structure: /* .IP TLScontext->protocol /* the protocol name (SSLv2, SSLv3, TLSv1), /* .IP TLScontext->cipher_name /* the cipher name (e.g. RC4/MD5), /* .IP TLScontext->cipher_usebits /* the number of bits actually used (e.g. 40), /* .IP TLScontext->cipher_algbits /* the number of bits the algorithm is based on (e.g. 128). /* .PP /* The last two values may differ from each other when export-strength /* encryption is used. /* /* If the peer offered a certificate, part of the certificate data are /* available as: /* .IP TLScontext->peer_status /* A bitmask field that records the status of the peer certificate /* verification. One or more of TLS_CERT_FLAG_PRESENT and /* TLS_CERT_FLAG_TRUSTED. /* .IP TLScontext->peer_CN /* Extracted CommonName of the peer, or zero-length string /* when information could not be extracted. /* .IP TLScontext->issuer_CN /* Extracted CommonName of the issuer, or zero-length string /* when information could not be extracted. /* .IP TLScontext->peer_fingerprint /* Fingerprint of the certificate, or zero-length string when no peer /* certificate is available. /* .PP /* If no peer certificate is presented the peer_status is set to 0. /* EVENT_DRIVEN APPLICATIONS /* .ad /* .fi /* Event-driven programs manage multiple I/O channels. Such /* programs cannot use the synchronous VSTREAM-over-TLS /* implementation that the current TLS library provides, /* including tls_server_stop() and the underlying tls_stream(3) /* and tls_bio_ops(3) routines. /* /* With the current TLS library implementation, this means /* that the application is responsible for calling and retrying /* SSL_accept(), SSL_read(), SSL_write() and SSL_shutdown(). /* /* To maintain control over TLS I/O, an event-driven server /* invokes tls_server_start() with a null VSTREAM argument and /* with an fd argument that specifies the I/O file descriptor. /* Then, tls_server_start() performs all the necessary /* preparations before the TLS handshake and returns a partially /* populated TLS context. The event-driven application is then /* responsible for invoking SSL_accept(), and if successful, /* for invoking tls_server_post_accept() to finish the work /* that was started by tls_server_start(). In case of unrecoverable /* failure, tls_server_post_accept() destroys the TLS context /* and returns a null pointer value. /* 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 /*--*/ /* System library. */ #include <sys_defs.h> #ifdef USE_TLS #include <unistd.h> #include <string.h> /* Utility library. */ #include <mymalloc.h> #include <vstring.h> #include <vstream.h> #include <dict.h> #include <stringops.h> #include <msg.h> #include <hex_code.h> #include <iostuff.h> /* non-blocking */ /* Global library. */ #include <mail_params.h> /* TLS library. */ #include <tls_mgr.h> #define TLS_INTERNAL #include <tls.h> #define STR(x) vstring_str(x) #define LEN(x) VSTRING_LEN(x) /* Application-specific. */ /* * The session_id_context indentifies the service that created a session. * This information is used to distinguish between multiple TLS-based * servers running on the same server. We use the name of the mail system. */ static const char server_session_id_context[] = "Postfix/TLS"; /* get_server_session_cb - callback to retrieve session from server cache */ static SSL_SESSION *get_server_session_cb(SSL *ssl, unsigned char *session_id, int session_id_length, int *unused_copy) { const char *myname = "get_server_session_cb"; TLS_SESS_STATE *TLScontext; VSTRING *cache_id; VSTRING *session_data = vstring_alloc(2048); SSL_SESSION *session = 0; if ((TLScontext = SSL_get_ex_data(ssl, TLScontext_index)) == 0) msg_panic("%s: null TLScontext in session lookup callback", myname); #define GEN_CACHE_ID(buf, id, len, service) \ do { \ buf = vstring_alloc(2 * (len) + 1 + strlen(service) + 3); \ hex_encode(buf, (char *) (id), (len)); \ vstring_sprintf_append(buf, "&s=%s", (service)); \ } while (0) GEN_CACHE_ID(cache_id, session_id, session_id_length, TLScontext->serverid); if (TLScontext->log_mask & TLS_LOG_CACHE) msg_info("%s: looking up session %s in %s cache", TLScontext->namaddr, STR(cache_id), TLScontext->cache_type); /* * Load the session from cache and decode it. */ if (tls_mgr_lookup(TLScontext->cache_type, STR(cache_id), session_data) == TLS_MGR_STAT_OK) { session = tls_session_activate(STR(session_data), LEN(session_data)); if (session && (TLScontext->log_mask & TLS_LOG_CACHE)) msg_info("%s: reloaded session %s from %s cache", TLScontext->namaddr, STR(cache_id), TLScontext->cache_type); } /* * Clean up. */ vstring_free(cache_id); vstring_free(session_data); return (session); } /* uncache_session - remove session from internal & external cache */ static void uncache_session(SSL_CTX *ctx, TLS_SESS_STATE *TLScontext) { VSTRING *cache_id; SSL_SESSION *session = SSL_get_session(TLScontext->con); SSL_CTX_remove_session(ctx, session); if (TLScontext->cache_type == 0) return; GEN_CACHE_ID(cache_id, session->session_id, session->session_id_length, TLScontext->serverid); if (TLScontext->log_mask & TLS_LOG_CACHE) msg_info("%s: remove session %s from %s cache", TLScontext->namaddr, STR(cache_id), TLScontext->cache_type); tls_mgr_delete(TLScontext->cache_type, STR(cache_id)); vstring_free(cache_id); } /* new_server_session_cb - callback to save session to server cache */ static int new_server_session_cb(SSL *ssl, SSL_SESSION *session) { const char *myname = "new_server_session_cb"; VSTRING *cache_id; TLS_SESS_STATE *TLScontext; VSTRING *session_data; if ((TLScontext = SSL_get_ex_data(ssl, TLScontext_index)) == 0) msg_panic("%s: null TLScontext in new session callback", myname); GEN_CACHE_ID(cache_id, session->session_id, session->session_id_length, TLScontext->serverid); if (TLScontext->log_mask & TLS_LOG_CACHE) msg_info("%s: save session %s to %s cache", TLScontext->namaddr, STR(cache_id), TLScontext->cache_type); /* * Passivate and save the session state. */ session_data = tls_session_passivate(session); if (session_data) tls_mgr_update(TLScontext->cache_type, STR(cache_id), STR(session_data), LEN(session_data)); /* * Clean up. */ if (session_data) vstring_free(session_data); vstring_free(cache_id); SSL_SESSION_free(session); /* 200502 */ return (1); } /* tls_server_init - initialize the server-side TLS engine */ TLS_APPL_STATE *tls_server_init(const TLS_SERVER_INIT_PROPS *props) { SSL_CTX *server_ctx; long off = 0; int verify_flags = SSL_VERIFY_NONE; int cachable; int protomask; TLS_APPL_STATE *app_ctx; const EVP_MD *md_alg; unsigned int md_len; int log_mask; /* * Convert user loglevel to internal logmask. */ log_mask = tls_log_mask(props->log_param, props->log_level); if (log_mask & TLS_LOG_VERBOSE) msg_info("initializing the server-side TLS engine"); /* * Load (mostly cipher related) TLS-library internal main.cf parameters. */ tls_param_init(); /* * Detect mismatch between compile-time headers and run-time library. */ tls_check_version(); /* * Initialize the OpenSSL library by the book! To start with, we must * initialize the algorithms. We want cleartext error messages instead of * just error codes, so we load the error_strings. */ SSL_load_error_strings(); OpenSSL_add_ssl_algorithms(); /* * First validate the protocols. If these are invalid, we can't continue. */ protomask = tls_protocol_mask(props->protocols); if (protomask == TLS_PROTOCOL_INVALID) { /* tls_protocol_mask() logs no warning. */ msg_warn("Invalid TLS protocol list \"%s\": disabling TLS support", props->protocols); return (0); } /* * Create an application data index for SSL objects, so that we can * attach TLScontext information; this information is needed inside * tls_verify_certificate_callback(). */ if (TLScontext_index < 0) { if ((TLScontext_index = SSL_get_ex_new_index(0, 0, 0, 0, 0)) < 0) { msg_warn("Cannot allocate SSL application data index: " "disabling TLS support"); return (0); } } /* * 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(props->fpt_dgst)) == 0) { msg_warn("Digest algorithm \"%s\" not found: disabling TLS support", props->fpt_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:" " disabling TLS support", props->fpt_dgst, md_len); return (0); } /* * Initialize the PRNG (Pseudo Random Number Generator) with some seed * from external and internal sources. Don't enable TLS without some real * entropy. */ if (tls_ext_seed(var_tls_daemon_rand_bytes) < 0) { msg_warn("no entropy for TLS key generation: disabling TLS support"); return (0); } tls_int_seed(); /* * The SSL/TLS specifications require the client to send a message in the * oldest specification it understands with the highest level it * understands in the message. Netscape communicator can still * communicate with SSLv2 servers, so it sends out a SSLv2 client hello. * To deal with it, our server must be SSLv2 aware (even if we don't like * SSLv2), so we need to have the SSLv23 server here. If we want to limit * the protocol level, we can add an option to not use SSLv2/v3/TLSv1 * later. */ ERR_clear_error(); if ((server_ctx = SSL_CTX_new(SSLv23_server_method())) == 0) { msg_warn("cannot allocate server SSL_CTX: disabling TLS support"); tls_print_errors(); return (0); } /* * See the verify callback in tls_verify.c */ SSL_CTX_set_verify_depth(server_ctx, props->verifydepth + 1); /* * Protocol work-arounds, OpenSSL version dependent. */ off |= tls_bug_bits(); SSL_CTX_set_options(server_ctx, off); /* * Global protocol selection. */ if (protomask != 0) SSL_CTX_set_options(server_ctx, ((protomask & TLS_PROTOCOL_TLSv1) ? SSL_OP_NO_TLSv1 : 0L) #ifdef SSL_OP_NO_TLSv1_1 | ((protomask & TLS_PROTOCOL_TLSv1_1) ? SSL_OP_NO_TLSv1_1 : 0L) #endif #ifdef SSL_OP_NO_TLSv1_2 | ((protomask & TLS_PROTOCOL_TLSv1_2) ? SSL_OP_NO_TLSv1_2 : 0L) #endif | ((protomask & TLS_PROTOCOL_SSLv3) ? SSL_OP_NO_SSLv3 : 0L) | ((protomask & TLS_PROTOCOL_SSLv2) ? SSL_OP_NO_SSLv2 : 0L)); #if OPENSSL_VERSION_NUMBER >= 0x0090700fL /* * Some sites may want to give the client less rope. On the other hand, * this could trigger inter-operability issues, the client should not * offer ciphers it implements poorly, but this hasn't stopped some * vendors from getting it wrong. * * XXX: Given OpenSSL's security history, nobody should still be using * 0.9.7, let alone 0.9.6 or earlier. Warning added to TLS_README.html. */ if (var_tls_preempt_clist) SSL_CTX_set_options(server_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE); #endif /* * Set the call-back routine to debug handshake progress. */ if (log_mask & TLS_LOG_DEBUG) SSL_CTX_set_info_callback(server_ctx, tls_info_callback); /* * Load the CA public key certificates for both the server cert and for * the verification of client certificates. As provided by OpenSSL we * support two types of CA certificate handling: One possibility is to * add all CA certificates to one large CAfile, the other possibility is * a directory pointed to by CApath, containing separate files for each * CA with softlinks named after the hash values of the certificate. The * first alternative has the advantage that the file is opened and read * at startup time, so that you don't have the hassle to maintain another * copy of the CApath directory for chroot-jail. */ if (tls_set_ca_certificate_info(server_ctx, props->CAfile, props->CApath) < 0) { /* tls_set_ca_certificate_info() already logs a warning. */ SSL_CTX_free(server_ctx); /* 200411 */ return (0); } /* * Load the server public key certificate and private key from file and * check whether the cert matches the key. We can use RSA certificates * ("cert") DSA certificates ("dcert") or ECDSA certificates ("eccert"). * All three can be made available at the same time. The CA certificates * for all three are handled in the same setup already finished. Which * one is used depends on the cipher negotiated (that is: the first * cipher listed by the client which does match the server). A client * with RSA only (e.g. Netscape) will use the RSA certificate only. A * client with openssl-library will use RSA first if not especially * changed in the cipher setup. */ if (tls_set_my_certificate_key_info(server_ctx, props->cert_file, props->key_file, props->dcert_file, props->dkey_file, props->eccert_file, props->eckey_file) < 0) { /* tls_set_my_certificate_key_info() already logs a warning. */ SSL_CTX_free(server_ctx); /* 200411 */ return (0); } /* * According to OpenSSL documentation, a temporary RSA key is needed when * export ciphers are in use, because the certified key cannot be * directly used. */ SSL_CTX_set_tmp_rsa_callback(server_ctx, tls_tmp_rsa_cb); /* * Diffie-Hellman key generation parameters can either be loaded from * files (preferred) or taken from compiled in values. First, set the * callback that will select the values when requested, then load the * (possibly) available DH parameters from files. We are generous with * the error handling, since we do have default values compiled in, so we * will not abort but just log the error message. */ SSL_CTX_set_tmp_dh_callback(server_ctx, tls_tmp_dh_cb); if (*props->dh1024_param_file != 0) tls_set_dh_from_file(props->dh1024_param_file, 1024); if (*props->dh512_param_file != 0) tls_set_dh_from_file(props->dh512_param_file, 512); /* * Enable EECDH if available, errors are not fatal, we just keep going * with any remaining key-exchange algorithms. */ (void) tls_set_eecdh_curve(server_ctx, props->eecdh_grade); /* * If we want to check client certificates, we have to indicate it in * advance. By now we only allow to decide on a global basis. If we want * to allow certificate based relaying, we must ask the client to provide * one with SSL_VERIFY_PEER. The client now can decide, whether it * provides one or not. We can enforce a failure of the negotiation with * SSL_VERIFY_FAIL_IF_NO_PEER_CERT, if we do not allow a connection * without one. In the "server hello" following the initialization by the * "client hello" the server must provide a list of CAs it is willing to * accept. Some clever clients will then select one from the list of * available certificates matching these CAs. Netscape Communicator will * present the list of certificates for selecting the one to be sent, or * it will issue a warning, if there is no certificate matching the * available CAs. * * With regard to the purpose of the certificate for relaying, we might like * a later negotiation, maybe relaying would already be allowed for other * reasons, but this would involve severe changes in the internal postfix * logic, so we have to live with it the way it is. */ if (props->ask_ccert) verify_flags = SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE; SSL_CTX_set_verify(server_ctx, verify_flags, tls_verify_certificate_callback); if (*props->CAfile) SSL_CTX_set_client_CA_list(server_ctx, SSL_load_client_CA_file(props->CAfile)); /* * Initialize our own TLS server handle, before diving into the details * of TLS session cache management. */ app_ctx = tls_alloc_app_context(server_ctx, log_mask); /* * The session cache is implemented by the tlsmgr(8) server. * * XXX 200502 Surprise: when OpenSSL purges an entry from the in-memory * cache, it also attempts to purge the entry from the on-disk cache. * This is undesirable, especially when we set the in-memory cache size * to 1. For this reason we don't allow OpenSSL to purge on-disk cache * entries, and leave it up to the tlsmgr process instead. Found by * Victor Duchovni. */ if (tls_mgr_policy(props->cache_type, &cachable) != TLS_MGR_STAT_OK) cachable = 0; if (cachable || props->set_sessid) { /* * Initialize the session cache. * * With a large number of concurrent smtpd(8) processes, it is not a * good idea to cache multiple large session objects in each process. * We set the internal cache size to 1, and don't register a * "remove_cb" so as to avoid deleting good sessions from the * external cache prematurely (when the internal cache is full, * OpenSSL removes sessions from the external cache also)! * * This makes SSL_CTX_remove_session() not useful for flushing broken * sessions from the external cache, so we must delete them directly * (not via a callback). * * Set a session id context to identify to what type of server process * created a session. In our case, the context is simply the name of * the mail system: "Postfix/TLS". */ SSL_CTX_sess_set_cache_size(server_ctx, 1); SSL_CTX_set_session_id_context(server_ctx, (void *) &server_session_id_context, sizeof(server_session_id_context)); SSL_CTX_set_session_cache_mode(server_ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR); if (cachable) { app_ctx->cache_type = mystrdup(props->cache_type); SSL_CTX_sess_set_get_cb(server_ctx, get_server_session_cb); SSL_CTX_sess_set_new_cb(server_ctx, new_server_session_cb); } /* * OpenSSL ignores timed-out sessions. We need to set the internal * cache timeout at least as high as the external cache timeout. This * applies even if no internal cache is used. */ SSL_CTX_set_timeout(server_ctx, props->scache_timeout); } else { /* * If we have no external cache, disable all caching. No use wasting * server memory resources with sessions they are unlikely to be able * to reuse. */ SSL_CTX_set_session_cache_mode(server_ctx, SSL_SESS_CACHE_OFF); } return (app_ctx); } /* * This is the actual startup routine for a new connection. We expect that * the SMTP buffers are flushed and the "220 Ready to start TLS" was sent to * the client, so that we can immediately start the TLS handshake process. */ TLS_SESS_STATE *tls_server_start(const TLS_SERVER_START_PROPS *props) { int sts; TLS_SESS_STATE *TLScontext; const char *cipher_list; TLS_APPL_STATE *app_ctx = props->ctx; int log_mask = app_ctx->log_mask; /* * Implicitly enable logging of trust chain errors when verified certs * are required. */ if (props->requirecert) log_mask |= TLS_LOG_UNTRUSTED; if (log_mask & TLS_LOG_VERBOSE) msg_info("setting up TLS connection from %s", props->namaddr); cipher_list = tls_set_ciphers(app_ctx, "TLS", props->cipher_grade, props->cipher_exclusions); if (cipher_list == 0) { msg_warn("%s: %s: aborting TLS session", props->namaddr, vstring_str(app_ctx->why)); return (0); } if (log_mask & TLS_LOG_VERBOSE) msg_info("%s: TLS cipher list \"%s\"", props->namaddr, cipher_list); /* * Allocate a new TLScontext for the new connection and get an SSL * structure. Add the location of TLScontext to the SSL to later retrieve * the information inside the tls_verify_certificate_callback(). */ TLScontext = tls_alloc_sess_context(log_mask, props->namaddr); TLScontext->cache_type = app_ctx->cache_type; TLScontext->serverid = mystrdup(props->serverid); TLScontext->am_server = 1; TLScontext->fpt_dgst = mystrdup(props->fpt_dgst); TLScontext->stream = props->stream; ERR_clear_error(); if ((TLScontext->con = (SSL *) SSL_new(app_ctx->ssl_ctx)) == 0) { msg_warn("Could not allocate 'TLScontext->con' with SSL_new()"); tls_print_errors(); tls_free_context(TLScontext); return (0); } if (!SSL_set_ex_data(TLScontext->con, TLScontext_index, TLScontext)) { msg_warn("Could not set application data for 'TLScontext->con'"); tls_print_errors(); tls_free_context(TLScontext); return (0); } /* * Before really starting anything, try to seed the PRNG a little bit * more. */ tls_int_seed(); (void) tls_ext_seed(var_tls_daemon_rand_bytes); /* * Initialize the SSL connection to accept state. This should not be * necessary anymore since 0.9.3, but the call is still in the library * and maintaining compatibility never hurts. */ SSL_set_accept_state(TLScontext->con); /* * Connect the SSL connection with the network socket. */ if (SSL_set_fd(TLScontext->con, props->stream == 0 ? props->fd : vstream_fileno(props->stream)) != 1) { msg_info("SSL_set_fd error to %s", props->namaddr); tls_print_errors(); uncache_session(app_ctx->ssl_ctx, TLScontext); tls_free_context(TLScontext); return (0); } /* * If the debug level selected is high enough, all of the data is dumped: * TLS_LOG_TLSPKTS will dump the SSL negotiation, TLS_LOG_ALLPKTS will * dump everything. * * We do have an SSL_set_fd() and now suddenly a BIO_ routine is called? * Well there is a BIO below the SSL routines that is automatically * created for us, so we can use it for debugging purposes. */ if (log_mask & TLS_LOG_TLSPKTS) BIO_set_callback(SSL_get_rbio(TLScontext->con), tls_bio_dump_cb); /* * If we don't trigger the handshake in the library, leave control over * SSL_accept/read/write/etc with the application. */ if (props->stream == 0) return (TLScontext); /* * Turn on non-blocking I/O so that we can enforce timeouts on network * I/O. */ non_blocking(vstream_fileno(props->stream), NON_BLOCKING); /* * Start TLS negotiations. This process is a black box that invokes our * call-backs for session caching and certificate verification. * * Error handling: If the SSL handhake fails, we print out an error message * and remove all TLS state concerning this session. */ sts = tls_bio_accept(vstream_fileno(props->stream), props->timeout, TLScontext); if (sts <= 0) { if (ERR_peek_error() != 0) { msg_info("SSL_accept error from %s: %d", props->namaddr, sts); tls_print_errors(); } else if (errno != 0) { msg_info("SSL_accept error from %s: %m", props->namaddr); } else { msg_info("SSL_accept error from %s: lost connection", props->namaddr); } tls_free_context(TLScontext); return (0); } return (tls_server_post_accept(TLScontext)); } /* tls_server_post_accept - post-handshake processing */ TLS_SESS_STATE *tls_server_post_accept(TLS_SESS_STATE *TLScontext) { const SSL_CIPHER *cipher; X509 *peer; char buf[CCERT_BUFSIZ]; /* Turn off packet dump if only dumping the handshake */ if ((TLScontext->log_mask & TLS_LOG_ALLPKTS) == 0) BIO_set_callback(SSL_get_rbio(TLScontext->con), 0); /* * The caller may want to know if this session was reused or if a new * session was negotiated. */ TLScontext->session_reused = SSL_session_reused(TLScontext->con); if ((TLScontext->log_mask & TLS_LOG_CACHE) && TLScontext->session_reused) msg_info("%s: Reusing old session", TLScontext->namaddr); /* * Let's see whether a peer certificate is available and what is the * actual information. We want to save it for later use. */ peer = SSL_get_peer_certificate(TLScontext->con); if (peer != NULL) { TLScontext->peer_status |= TLS_CERT_FLAG_PRESENT; if (SSL_get_verify_result(TLScontext->con) == X509_V_OK) TLScontext->peer_status |= TLS_CERT_FLAG_TRUSTED; if (TLScontext->log_mask & TLS_LOG_VERBOSE) { X509_NAME_oneline(X509_get_subject_name(peer), buf, sizeof(buf)); msg_info("subject=%s", buf); X509_NAME_oneline(X509_get_issuer_name(peer), buf, sizeof(buf)); msg_info("issuer=%s", buf); } TLScontext->peer_CN = tls_peer_CN(peer, TLScontext); TLScontext->issuer_CN = tls_issuer_CN(peer, TLScontext); TLScontext->peer_fingerprint = tls_fingerprint(peer, TLScontext->fpt_dgst); TLScontext->peer_pkey_fprint = tls_pkey_fprint(peer, TLScontext->fpt_dgst); if (TLScontext->log_mask & (TLS_LOG_VERBOSE | TLS_LOG_PEERCERT)) { msg_info("%s: subject_CN=%s, issuer=%s, fingerprint=%s" ", pkey_fingerprint=%s", TLScontext->namaddr, TLScontext->peer_CN, TLScontext->issuer_CN, TLScontext->peer_fingerprint, TLScontext->peer_pkey_fprint); } X509_free(peer); } else { TLScontext->peer_CN = mystrdup(""); TLScontext->issuer_CN = mystrdup(""); TLScontext->peer_fingerprint = mystrdup(""); } /* * Finally, collect information about protocol and cipher for logging */ TLScontext->protocol = SSL_get_version(TLScontext->con); cipher = SSL_get_current_cipher(TLScontext->con); TLScontext->cipher_name = SSL_CIPHER_get_name(cipher); TLScontext->cipher_usebits = SSL_CIPHER_get_bits(cipher, &(TLScontext->cipher_algbits)); /* * If the library triggered the SSL handshake, switch to the * tls_timed_read/write() functions and make the TLScontext available to * those functions. Otherwise, leave control over SSL_read/write/etc. * with the application. */ if (TLScontext->stream != 0) tls_stream_start(TLScontext->stream, TLScontext); /* * All the key facts in a single log entry. */ if (TLScontext->log_mask & TLS_LOG_SUMMARY) msg_info("%s TLS connection established from %s: %s with cipher %s " "(%d/%d bits)", !TLS_CERT_IS_PRESENT(TLScontext) ? "Anonymous" : TLS_CERT_IS_TRUSTED(TLScontext) ? "Trusted" : "Untrusted", TLScontext->namaddr, TLScontext->protocol, TLScontext->cipher_name, TLScontext->cipher_usebits, TLScontext->cipher_algbits); tls_int_seed(); return (TLScontext); } #endif /* USE_TLS */