Esempio n. 1
0
static void verify_extract_print(TLS_SESS_STATE *TLScontext, X509 *peercert,
	const TLS_CLIENT_START_PROPS *props)
{
    char  **cpp;

    /* Non-null by contract */
    TLScontext->peer_fingerprint = tls_fingerprint(peercert, props->fpt_dgst);

    if (props->tls_level != TLS_LEV_FPRINT)
	return;

    /*
     * Compare the fingerprint against each acceptable value, ignoring
     * upper/lower case differences.
     */
    for (cpp = props->matchargv->argv; *cpp; ++cpp)
	if (strcasecmp(TLScontext->peer_fingerprint, *cpp) == 0) {
	    TLScontext->peer_status |= TLS_CERT_FLAG_MATCHED;
	    break;
	}
    if (props->log_level >= 2)
	acl_msg_info("%s %s%s fingerprint %s", props->namaddr,
		TLS_CERT_IS_MATCHED(TLScontext) ? "Matched " : "",
		props->fpt_dgst, TLScontext->peer_fingerprint);
}
Esempio n. 2
0
 /*
  * This is the actual startup routine for the connection. We expect that the
  * buffers are flushed and the "220 Ready to start TLS" was received by us,
  * so that we can immediately start the TLS handshake process.
  */
TLS_SESS_STATE *tls_client_start(const TLS_CLIENT_START_PROPS *props)
{
    int     sts;
    int     protomask;
    const char *cipher_list;
    SSL_SESSION *session = 0;
    SSL_CIPHER_const SSL_CIPHER *cipher;
    X509   *peercert;
    TLS_SESS_STATE *TLScontext;
    TLS_APPL_STATE *app_ctx = props->ctx;
    char   *myserverid;
    int     log_mask = app_ctx->log_mask;

    /*
     * When certificate verification is required, log trust chain validation
     * errors even when disabled by default for opportunistic sessions. For
     * DANE this only applies when using trust-anchor associations.
     */
    if (TLS_MUST_TRUST(props->tls_level)
      && (!TLS_DANE_BASED(props->tls_level) || TLS_DANE_HASTA(props->dane)))
	log_mask |= TLS_LOG_UNTRUSTED;

    if (log_mask & TLS_LOG_VERBOSE)
	msg_info("setting up TLS connection to %s", props->namaddr);

    /*
     * First make sure we have valid protocol and cipher parameters
     * 
     * Per-session protocol restrictions must be applied to the SSL connection,
     * as restrictions in the global context cannot be cleared.
     */
    protomask = tls_protocol_mask(props->protocols);
    if (protomask == TLS_PROTOCOL_INVALID) {
	/* tls_protocol_mask() logs no warning. */
	msg_warn("%s: Invalid TLS protocol list \"%s\": aborting TLS session",
		 props->namaddr, props->protocols);
	return (0);
    }
    /* DANE requires SSLv3 or later, not SSLv2. */
    if (TLS_DANE_BASED(props->tls_level))
	protomask |= TLS_PROTOCOL_SSLv2;

    /*
     * Per session cipher selection for sessions with mandatory encryption
     * 
     * The cipherlist is applied to the global SSL context, since it is likely
     * to stay the same between connections, so we make use of a 1-element
     * cache to return the same result for identical inputs.
     */
    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);

    /*
     * OpenSSL will ignore cached sessions that use the wrong protocol. So we
     * do not need to filter out cached sessions with the "wrong" protocol,
     * rather OpenSSL will simply negotiate a new session.
     * 
     * We salt the session lookup key with the protocol list, so that sessions
     * found in the cache are plausibly acceptable.
     * 
     * By the time a TLS client is negotiating ciphers it has already offered to
     * re-use a session, it is too late to renege on the offer. So we must
     * not attempt to re-use sessions whose ciphers are too weak. We salt the
     * session lookup key with the cipher list, so that sessions found in the
     * cache are always acceptable.
     * 
     * With DANE, (more generally any TLScontext where we specified explicit
     * trust-anchor or end-entity certificates) the verification status of
     * the SSL session depends on the specified list.  Since we verify the
     * certificate only during the initial handshake, we must segregate
     * sessions with different TA lists.  Note, that TA re-verification is
     * not possible with cached sessions, since these don't hold the complete
     * peer trust chain.  Therefore, we compute a digest of the sorted TA
     * parameters and append it to the serverid.
     */
    myserverid = tls_serverid_digest(props, protomask, 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().
     * 
     * If session caching was enabled when TLS was initialized, the cache type
     * is stored in the client SSL context.
     */
    TLScontext = tls_alloc_sess_context(log_mask, props->namaddr);
    TLScontext->cache_type = app_ctx->cache_type;

    TLScontext->serverid = myserverid;
    TLScontext->stream = props->stream;
    TLScontext->mdalg = props->mdalg;

    /* Alias DANE digest info from props */
    TLScontext->dane = props->dane;

    if ((TLScontext->con = SSL_new(app_ctx->ssl_ctx)) == NULL) {
	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);
    }

    /*
     * Apply session protocol restrictions.
     */
    if (protomask != 0)
	SSL_set_options(TLScontext->con, TLS_SSL_OP_PROTOMASK(protomask));

    /*
     * XXX To avoid memory leaks we must always call SSL_SESSION_free() after
     * calling SSL_set_session(), regardless of whether or not the session
     * will be reused.
     */
    if (TLScontext->cache_type) {
	session = load_clnt_session(TLScontext);
	if (session) {
	    SSL_set_session(TLScontext->con, session);
	    SSL_SESSION_free(session);		/* 200411 */
	}
    }
#ifdef TLSEXT_MAXLEN_host_name
    if (TLS_DANE_BASED(props->tls_level)
	&& strlen(props->host) <= TLSEXT_MAXLEN_host_name) {

	/*
	 * With DANE sessions, send an SNI hint.  We don't care whether the
	 * server reports finding a matching certificate or not, so no
	 * callback is required to process the server response.  Our use of
	 * SNI is limited to giving servers that are (mis)configured to use
	 * SNI the best opportunity to find the certificate they promised via
	 * the associated TLSA RRs.  (Generally, server administrators should
	 * avoid SNI, and there are no plans to support SNI in the Postfix
	 * SMTP server).
	 * 
	 * Since the hostname is DNSSEC-validated, it must be a DNS FQDN and
	 * thererefore valid for use with SNI.  Failure to set a valid SNI
	 * hostname is a memory allocation error, and thus transient.  Since
	 * we must not cache the session if we failed to send the SNI name,
	 * we have little choice but to abort.
	 */
	if (!SSL_set_tlsext_host_name(TLScontext->con, props->host)) {
	    msg_warn("%s: error setting SNI hostname to: %s", props->namaddr,
		     props->host);
	    tls_free_context(TLScontext);
	    return (0);
	}
	if (log_mask & TLS_LOG_DEBUG)
	    msg_info("%s: SNI hostname: %s", props->namaddr, props->host);
    }
#endif

    /*
     * 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 connect 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_connect_state(TLScontext->con);

    /*
     * Connect the SSL connection with the network socket.
     */
    if (SSL_set_fd(TLScontext->con, 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);
    }

    /*
     * Turn on non-blocking I/O so that we can enforce timeouts on network
     * I/O.
     */
    non_blocking(vstream_fileno(props->stream), NON_BLOCKING);

    /*
     * 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);

    tls_dane_set_callback(app_ctx->ssl_ctx, TLScontext);

    /*
     * Start TLS negotiations. This process is a black box that invokes our
     * call-backs for 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_connect(vstream_fileno(props->stream), props->timeout,
			  TLScontext);
    if (sts <= 0) {
	if (ERR_peek_error() != 0) {
	    msg_info("SSL_connect error to %s: %d", props->namaddr, sts);
	    tls_print_errors();
	} else if (errno != 0) {
	    msg_info("SSL_connect error to %s: %m", props->namaddr);
	} else {
	    msg_info("SSL_connect error to %s: lost connection",
		     props->namaddr);
	}
	uncache_session(app_ctx->ssl_ctx, TLScontext);
	tls_free_context(TLScontext);
	return (0);
    }
    /* Turn off packet dump if only dumping the handshake */
    if ((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 ((log_mask & TLS_LOG_CACHE) && TLScontext->session_reused)
	msg_info("%s: Reusing old session", TLScontext->namaddr);

    /*
     * Do peername verification if requested and extract useful information
     * from the certificate for later use.
     */
    if ((peercert = SSL_get_peer_certificate(TLScontext->con)) != 0) {
	TLScontext->peer_status |= TLS_CERT_FLAG_PRESENT;

	/*
	 * Peer name or fingerprint verification as requested.
	 * Unconditionally set peer_CN, issuer_CN and peer_cert_fprint. Check
	 * fingerprint first, and avoid logging verified as untrusted in the
	 * call to verify_extract_name().
	 */
	verify_extract_print(TLScontext, peercert, props);
	verify_extract_name(TLScontext, peercert, props);

	if (TLScontext->log_mask &
	    (TLS_LOG_CERTMATCH | TLS_LOG_VERBOSE | TLS_LOG_PEERCERT))
	    msg_info("%s: subject_CN=%s, issuer_CN=%s, "
		     "fingerprint=%s, pkey_fingerprint=%s", props->namaddr,
		     TLScontext->peer_CN, TLScontext->issuer_CN,
		     TLScontext->peer_cert_fprint,
		     TLScontext->peer_pkey_fprint);
	X509_free(peercert);
    } else {
	TLScontext->issuer_CN = mystrdup("");
	TLScontext->peer_CN = mystrdup("");
	TLScontext->peer_cert_fprint = mystrdup("");
	TLScontext->peer_pkey_fprint = 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));

    /*
     * The TLS engine is active. Switch to the tls_timed_read/write()
     * functions and make the TLScontext available to those functions.
     */
    tls_stream_start(props->stream, TLScontext);

    /*
     * All the key facts in a single log entry.
     */
    if (log_mask & TLS_LOG_SUMMARY)
	msg_info("%s TLS connection established to %s: %s with cipher %s "
		 "(%d/%d bits)",
		 !TLS_CERT_IS_PRESENT(TLScontext) ? "Anonymous" :
		 TLS_CERT_IS_MATCHED(TLScontext) ? "Verified" :
		 TLS_CERT_IS_TRUSTED(TLScontext) ? "Trusted" : "Untrusted",
	      props->namaddr, TLScontext->protocol, TLScontext->cipher_name,
		 TLScontext->cipher_usebits, TLScontext->cipher_algbits);

    tls_int_seed();

    return (TLScontext);
}
Esempio n. 3
0
static void verify_extract_name(TLS_SESS_STATE *TLScontext, X509 *peercert,
				        const TLS_CLIENT_START_PROPS *props)
{
    int     i;
    int     r;
    int     matched = 0;
    int     dnsname_match;
    int     verify_peername = 0;
    int     log_certmatch;
    int     verbose;
    const char *dnsname;
    const GENERAL_NAME *gn;
    general_name_stack_t *gens;

    /*
     * On exit both peer_CN and issuer_CN should be set.
     */
    TLScontext->issuer_CN = tls_issuer_CN(peercert, TLScontext);

    /*
     * Is the certificate trust chain valid and trusted?
     */
    if (SSL_get_verify_result(TLScontext->con) == X509_V_OK)
	TLScontext->peer_status |= TLS_CERT_FLAG_TRUSTED;

    /*
     * With fingerprint or dane we may already be done. Otherwise, verify the
     * peername if using traditional PKI or DANE with trust-anchors.
     */
    if (!TLS_CERT_IS_MATCHED(TLScontext)
	&& TLS_CERT_IS_TRUSTED(TLScontext)
	&& TLS_MUST_TRUST(props->tls_level))
	verify_peername = 1;

    /* Force cert processing so we can log the data? */
    log_certmatch = TLScontext->log_mask & TLS_LOG_CERTMATCH;

    /* Log cert details when processing? */
    verbose = log_certmatch || (TLScontext->log_mask & TLS_LOG_VERBOSE);

    if (verify_peername || log_certmatch) {

	/*
	 * Verify the dNSName(s) in the peer certificate against the nexthop
	 * and hostname.
	 * 
	 * If DNS names are present, we use the first matching (or else simply
	 * the first) DNS name as the subject CN. The CommonName in the
	 * issuer DN is obsolete when SubjectAltName is available. This
	 * yields much less surprising logs, because we log the name we
	 * verified or a name we checked and failed to match.
	 * 
	 * XXX: The nexthop and host name may both be the same network address
	 * rather than a DNS name. In this case we really should be looking
	 * for GEN_IPADD entries, not GEN_DNS entries.
	 * 
	 * XXX: In ideal world the caller who used the address to build the
	 * connection would tell us that the nexthop is the connection
	 * address, but if that is not practical, we can parse the nexthop
	 * again here.
	 */
	gens = X509_get_ext_d2i(peercert, NID_subject_alt_name, 0, 0);
	if (gens) {
	    r = sk_GENERAL_NAME_num(gens);
	    for (i = 0; i < r; ++i) {
		gn = sk_GENERAL_NAME_value(gens, i);
		if (gn->type != GEN_DNS)
		    continue;

		/*
		 * Even if we have an invalid DNS name, we still ultimately
		 * ignore the CommonName, because subjectAltName:DNS is
		 * present (though malformed). Replace any previous peer_CN
		 * if empty or we get a match.
		 * 
		 * We always set at least an empty peer_CN if the ALTNAME cert
		 * flag is set. If not, we set peer_CN from the cert
		 * CommonName below, so peer_CN is always non-null on return.
		 */
		TLScontext->peer_status |= TLS_CERT_FLAG_ALTNAME;
		dnsname = tls_dns_name(gn, TLScontext);
		if (dnsname && *dnsname) {
		    if ((dnsname_match = match_servername(dnsname, props)) != 0)
			matched++;
		    /* Keep the first matched name. */
		    if (TLScontext->peer_CN
			&& ((dnsname_match && matched == 1)
			    || *TLScontext->peer_CN == 0)) {
			myfree(TLScontext->peer_CN);
			TLScontext->peer_CN = 0;
		    }
		    if (verbose)
			msg_info("%s: %ssubjectAltName: %s", props->namaddr,
				 dnsname_match ? "Matched " : "", dnsname);
		}
		if (TLScontext->peer_CN == 0)
		    TLScontext->peer_CN = mystrdup(dnsname ? dnsname : "");
		if (matched && !log_certmatch)
		    break;
	    }
	    if (verify_peername && matched)
		TLScontext->peer_status |= TLS_CERT_FLAG_MATCHED;

	    /*
	     * (Sam Rushing, Ironport) Free stack *and* member GENERAL_NAME
	     * objects
	     */
	    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
	}

	/*
	 * No subjectAltNames, peer_CN is taken from CommonName.
	 */
	if (TLScontext->peer_CN == 0) {
	    TLScontext->peer_CN = tls_peer_CN(peercert, TLScontext);
	    if (*TLScontext->peer_CN)
		matched = match_servername(TLScontext->peer_CN, props);
	    if (verify_peername && matched)
		TLScontext->peer_status |= TLS_CERT_FLAG_MATCHED;
	    if (verbose)
		msg_info("%s %sCommonName %s", props->namaddr,
			 matched ? "Matched " : "", TLScontext->peer_CN);
	} else if (verbose) {
	    char   *tmpcn = tls_peer_CN(peercert, TLScontext);

	    /*
	     * Though the CommonName was superceded by a subjectAltName, log
	     * it when certificate match debugging was requested.
	     */
	    msg_info("%s CommonName %s", TLScontext->namaddr, tmpcn);
	    myfree(tmpcn);
	}
    } else
	TLScontext->peer_CN = tls_peer_CN(peercert, TLScontext);

    /*
     * Give them a clue. Problems with trust chain verification are logged
     * when the session is first negotiated, before the session is stored
     * into the cache. We don't want mystery failures, so log the fact the
     * real problem is to be found in the past.
     */
    if (!TLS_CERT_IS_TRUSTED(TLScontext)
	&& (TLScontext->log_mask & TLS_LOG_UNTRUSTED)) {
	if (TLScontext->session_reused == 0)
	    tls_log_verify_error(TLScontext);
	else
	    msg_info("%s: re-using session with untrusted certificate, "
		     "look for details earlier in the log", props->namaddr);
    }
}
Esempio n. 4
0
 /*
  * This is the actual startup routine for the connection. We expect that the
  * buffers are flushed and the "220 Ready to start TLS" was received by us,
  * so that we can immediately start the TLS handshake process.
  */
TLS_SESS_STATE *tls_client_start(const TLS_CLIENT_START_PROPS *props)
{
    int     sts;
    int     protomask;
    const char *cipher_list;
    SSL_SESSION *session;
    const SSL_CIPHER *cipher;
    X509   *peercert;
    TLS_SESS_STATE *TLScontext;
    TLS_APPL_STATE *app_ctx = props->ctx;
    VSTRING *myserverid;
    int     log_mask = app_ctx->log_mask;

    /*
     * When certificate verification is required, log trust chain validation
     * errors even when disabled by default for opportunistic sessions.
     */
    if (props->tls_level >= TLS_LEV_VERIFY)
	log_mask |= TLS_LOG_UNTRUSTED;

    if (log_mask & TLS_LOG_VERBOSE)
	msg_info("setting up TLS connection to %s", props->namaddr);

    /*
     * First make sure we have valid protocol and cipher parameters
     * 
     * The cipherlist will be applied to the global SSL context, where it can be
     * repeatedly reset if necessary, but the protocol restrictions will be
     * is applied to the SSL connection, because protocol restrictions in the
     * global context cannot be cleared.
     */

    /*
     * OpenSSL will ignore cached sessions that use the wrong protocol. So we
     * do not need to filter out cached sessions with the "wrong" protocol,
     * rather OpenSSL will simply negotiate a new session.
     * 
     * Still, we salt the session lookup key with the protocol list, so that
     * sessions found in the cache are always acceptable.
     */
    protomask = tls_protocol_mask(props->protocols);
    if (protomask == TLS_PROTOCOL_INVALID) {
	/* tls_protocol_mask() logs no warning. */
	msg_warn("%s: Invalid TLS protocol list \"%s\": aborting TLS session",
		 props->namaddr, props->protocols);
	return (0);
    }
    myserverid = vstring_alloc(100);
    vstring_sprintf_append(myserverid, "%s&p=%d", props->serverid, protomask);

    /*
     * Per session cipher selection for sessions with mandatory encryption
     * 
     * By the time a TLS client is negotiating ciphers it has already offered to
     * re-use a session, it is too late to renege on the offer. So we must
     * not attempt to re-use sessions whose ciphers are too weak. We salt the
     * session lookup key with the cipher list, so that sessions found in the
     * cache are always acceptable.
     */
    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));
	vstring_free(myserverid);
	return (0);
    }
    if (log_mask & TLS_LOG_VERBOSE)
	msg_info("%s: TLS cipher list \"%s\"", props->namaddr, cipher_list);
    vstring_sprintf_append(myserverid, "&c=%s", cipher_list);

    /*
     * Finally, salt the session key with the OpenSSL library version,
     * (run-time, rather than compile-time, just in case that matters).
     */
    vstring_sprintf_append(myserverid, "&l=%ld", (long) SSLeay());

    /*
     * 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().
     * 
     * If session caching was enabled when TLS was initialized, the cache type
     * is stored in the client SSL context.
     */
    TLScontext = tls_alloc_sess_context(log_mask, props->namaddr);
    TLScontext->cache_type = app_ctx->cache_type;

    TLScontext->serverid = vstring_export(myserverid);
    TLScontext->stream = props->stream;

    if ((TLScontext->con = SSL_new(app_ctx->ssl_ctx)) == NULL) {
	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);
    }

    /*
     * Apply session protocol restrictions.
     */
    if (protomask != 0)
	SSL_set_options(TLScontext->con,
		   ((protomask & TLS_PROTOCOL_TLSv1) ? SSL_OP_NO_TLSv1 : 0L)
	     | ((protomask & TLS_PROTOCOL_TLSv1_1) ? SSL_OP_NO_TLSv1_1 : 0L)
	     | ((protomask & TLS_PROTOCOL_TLSv1_2) ? SSL_OP_NO_TLSv1_2 : 0L)
		 | ((protomask & TLS_PROTOCOL_SSLv3) ? SSL_OP_NO_SSLv3 : 0L)
	       | ((protomask & TLS_PROTOCOL_SSLv2) ? SSL_OP_NO_SSLv2 : 0L));

    /*
     * XXX To avoid memory leaks we must always call SSL_SESSION_free() after
     * calling SSL_set_session(), regardless of whether or not the session
     * will be reused.
     */
    if (TLScontext->cache_type) {
	session = load_clnt_session(TLScontext);
	if (session) {
	    SSL_set_session(TLScontext->con, session);
	    SSL_SESSION_free(session);		/* 200411 */
#if (OPENSSL_VERSION_NUMBER < 0x00906011L) || (OPENSSL_VERSION_NUMBER == 0x00907000L)

	    /*
	     * Ugly Hack: OpenSSL before 0.9.6a does not store the verify
	     * result in sessions for the client side. We modify the session
	     * directly which is version specific, but this bug is version
	     * specific, too.
	     * 
	     * READ: 0-09-06-01-1 = 0-9-6-a-beta1: all versions before beta1
	     * have this bug, it has been fixed during development of 0.9.6a.
	     * The development version of 0.9.7 can have this bug, too. It
	     * has been fixed on 2000/11/29.
	     */
	    SSL_set_verify_result(TLScontext->con, session->verify_result);
#endif

	}
    }

    /*
     * 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 connect 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_connect_state(TLScontext->con);

    /*
     * Connect the SSL connection with the network socket.
     */
    if (SSL_set_fd(TLScontext->con, 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);
    }

    /*
     * Turn on non-blocking I/O so that we can enforce timeouts on network
     * I/O.
     */
    non_blocking(vstream_fileno(props->stream), NON_BLOCKING);

    /*
     * 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);

    /*
     * Start TLS negotiations. This process is a black box that invokes our
     * call-backs for 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_connect(vstream_fileno(props->stream), props->timeout,
			  TLScontext);
    if (sts <= 0) {
	if (ERR_peek_error() != 0) {
	    msg_info("SSL_connect error to %s: %d", props->namaddr, sts);
	    tls_print_errors();
	} else if (errno != 0) {
	    msg_info("SSL_connect error to %s: %m", props->namaddr);
	} else {
	    msg_info("SSL_connect error to %s: lost connection",
		     props->namaddr);
	}
	uncache_session(app_ctx->ssl_ctx, TLScontext);
	tls_free_context(TLScontext);
	return (0);
    }
    /* Turn off packet dump if only dumping the handshake */
    if ((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 ((log_mask & TLS_LOG_CACHE) && TLScontext->session_reused)
	msg_info("%s: Reusing old session", TLScontext->namaddr);

    /*
     * Do peername verification if requested and extract useful information
     * from the certificate for later use.
     */
    if ((peercert = SSL_get_peer_certificate(TLScontext->con)) != 0) {
	TLScontext->peer_status |= TLS_CERT_FLAG_PRESENT;

	/*
	 * Peer name or fingerprint verification as requested.
	 * Unconditionally set peer_CN, issuer_CN and peer_fingerprint.
	 */
	verify_extract_name(TLScontext, peercert, props);
	verify_extract_print(TLScontext, peercert, props);

	if (TLScontext->log_mask &
	    (TLS_LOG_CERTMATCH | TLS_LOG_VERBOSE | TLS_LOG_PEERCERT))
	    msg_info("%s: subject_CN=%s, issuer_CN=%s, "
		     "fingerprint %s, pkey_fingerprint=%s", props->namaddr,
		     TLScontext->peer_CN, TLScontext->issuer_CN,
		     TLScontext->peer_fingerprint,
		     TLScontext->peer_pkey_fprint);
	X509_free(peercert);
    } else {
	TLScontext->issuer_CN = mystrdup("");
	TLScontext->peer_CN = mystrdup("");
	TLScontext->peer_fingerprint = mystrdup("");
	TLScontext->peer_pkey_fprint = 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));

    /*
     * The TLS engine is active. Switch to the tls_timed_read/write()
     * functions and make the TLScontext available to those functions.
     */
    tls_stream_start(props->stream, TLScontext);

    /*
     * All the key facts in a single log entry.
     */
    if (log_mask & TLS_LOG_SUMMARY)
	msg_info("%s TLS connection established to %s: %s with cipher %s "
	      "(%d/%d bits)", TLS_CERT_IS_MATCHED(TLScontext) ? "Verified" :
		 TLS_CERT_IS_TRUSTED(TLScontext) ? "Trusted" : "Untrusted",
	      props->namaddr, TLScontext->protocol, TLScontext->cipher_name,
		 TLScontext->cipher_usebits, TLScontext->cipher_algbits);

    tls_int_seed();

    return (TLScontext);
}
Esempio n. 5
0
/*
 * This is the actual startup routine for the connection. We expect that the
 * buffers are flushed and the "220 Ready to start TLS" was received by us,
 * so that we can immediately start the TLS handshake process.
 */
TLS_SESS_STATE *tls_client_start(const TLS_CLIENT_START_PROPS *props)
{
    const   char *myname = "tls_client_start";
    int     sts;
    int     protomask;
    const char *cipher_list;
    SSL_SESSION *session;
    SSL_CIPHER *cipher;
    X509   *peercert;
    TLS_SESS_STATE *TLScontext;
    TLS_APPL_STATE *app_ctx = props->ctx;
    ACL_VSTRING *myserverid;

    if (props->log_level >= 1)
	acl_msg_info("%s(%d): setting up TLS connection to %s",
		myname, __LINE__, props->namaddr);

    /*
     * First make sure we have valid protocol and cipher parameters
     * 
     * The cipherlist will be applied to the global SSL context, where it can be
     * repeatedly reset if necessary, but the protocol restrictions will be
     * is applied to the SSL connection, because protocol restrictions in the
     * global context cannot be cleared.
     */

    /*
     * OpenSSL will ignore cached sessions that use the wrong protocol. So we
     * do not need to filter out cached sessions with the "wrong" protocol,
     * rather OpenSSL will simply negotiate a new session.
     * 
     * Still, we salt the session lookup key with the protocol list, so that
     * sessions found in the cache are always acceptable.
     */
    protomask = tls_protocol_mask(props->protocols);
    if (protomask == TLS_PROTOCOL_INVALID) {
	/* tls_protocol_mask() logs no warning. */
	acl_msg_warn("%s(%d): nameaddr: %s: Invalid TLS protocol list \"%s\": aborting TLS session",
		myname, __LINE__, props->namaddr, props->protocols);
	return (0);
    }
    myserverid = acl_vstring_alloc(100);
    acl_vstring_sprintf_append(myserverid, "%s&p=%d", props->serverid, protomask);

    /*
     * Per session cipher selection for sessions with mandatory encryption
     * 
     * By the time a TLS client is negotiating ciphers it has already offered to
     * re-use a session, it is too late to renege on the offer. So we must
     * not attempt to re-use sessions whose ciphers are too weak. We salt the
     * session lookup key with the cipher list, so that sessions found in the
     * cache are always acceptable.
     */
    cipher_list = tls_set_ciphers(app_ctx, "TLS", props->cipher_grade,
	    props->cipher_exclusions);
    if (cipher_list == 0) {
	acl_msg_warn("%s(%d): %s: %s: aborting TLS session",
		myname, __LINE__, props->namaddr, acl_vstring_str(app_ctx->why));
	acl_vstring_free(myserverid);
	return (0);
    }
    if (props->log_level >= 2)
	acl_msg_info("%s(%d): %s: TLS cipher list \"%s\"",
		myname, __LINE__, props->namaddr, cipher_list);
    acl_vstring_sprintf_append(myserverid, "&c=%s", 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().
     * 
     * If session caching was enabled when TLS was initialized, the cache type
     * is stored in the client SSL context.
     */
    TLScontext = tls_alloc_sess_context(props->log_level, props->namaddr);
    TLScontext->cache_type = app_ctx->cache_type;

    TLScontext->serverid = acl_vstring_export(myserverid);

    if ((TLScontext->con = SSL_new(app_ctx->ssl_ctx)) == NULL) {
	acl_msg_warn("%s(%d): Could not allocate 'TLScontext->con' with SSL_new()",
		myname, __LINE__);
	tls_print_errors();
	tls_free_context(TLScontext);
	return (0);
    }
    if (!SSL_set_ex_data(TLScontext->con, TLScontext_index, TLScontext)) {
	acl_msg_warn("%s(%d): Could not set application data for 'TLScontext->con'",
		myname, __LINE__);
	tls_print_errors();
	tls_free_context(TLScontext);
	return (0);
    }

    /*
     * Apply session protocol restrictions.
     */
    if (protomask != 0)
	SSL_set_options(TLScontext->con,
		((protomask & TLS_PROTOCOL_TLSv1) ? SSL_OP_NO_TLSv1 : 0L)
		| ((protomask & TLS_PROTOCOL_SSLv3) ? SSL_OP_NO_SSLv3 : 0L)
		| ((protomask & TLS_PROTOCOL_SSLv2) ? SSL_OP_NO_SSLv2 : 0L));

    /*
     * The TLS connection is realized by a BIO_pair, so obtain the pair.
     * 
     * XXX There is no need to make internal_bio a member of the TLScontext
     * structure. It will be attached to TLScontext->con, and destroyed along
     * with it. The network_bio, however, needs to be freed explicitly.
     */
    if (!BIO_new_bio_pair(&TLScontext->internal_bio, TLS_BIO_BUFSIZE,
		&TLScontext->network_bio, TLS_BIO_BUFSIZE)) {
	acl_msg_warn("%s(%d): Could not obtain BIO_pair", myname, __LINE__);
	tls_print_errors();
	tls_free_context(TLScontext);
	return (0);
    }

    /*
     * XXX To avoid memory leaks we must always call SSL_SESSION_free() after
     * calling SSL_set_session(), regardless of whether or not the session
     * will be reused.
     */
    if (TLScontext->cache_type) {
	session = load_clnt_session(TLScontext);
	if (session) {
	    SSL_set_session(TLScontext->con, session);
	    SSL_SESSION_free(session);		/* 200411 */
#if (OPENSSL_VERSION_NUMBER < 0x00906011L) || (OPENSSL_VERSION_NUMBER == 0x00907000L)

	    /*
	     * Ugly Hack: OpenSSL before 0.9.6a does not store the verify
	     * result in sessions for the client side. We modify the session
	     * directly which is version specific, but this bug is version
	     * specific, too.
	     * 
	     * READ: 0-09-06-01-1 = 0-9-6-a-beta1: all versions before beta1
	     * have this bug, it has been fixed during development of 0.9.6a.
	     * The development version of 0.9.7 can have this bug, too. It
	     * has been fixed on 2000/11/29.
	     */
	    SSL_set_verify_result(TLScontext->con, session->verify_result);
#endif
	}
    }

    /*
     * Before really starting anything, try to seed the PRNG a little bit
     * more.
     */
    tls_int_seed();
    if (var_tls_daemon_rand_bytes > 0)
	(void) tls_ext_seed(var_tls_daemon_rand_bytes);

    /*
     * Initialize the SSL connection to connect 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_connect_state(TLScontext->con);

    /*
     * Connect the SSL connection with the Postfix side of the BIO-pair for
     * reading and writing.
     */
    SSL_set_bio(TLScontext->con, TLScontext->internal_bio, TLScontext->internal_bio);

    /*
     * If the debug level selected is high enough, all of the data is dumped:
     * 3 will dump the SSL negotiation, 4 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 (props->log_level >= 3)
	BIO_set_callback(SSL_get_rbio(TLScontext->con), tls_bio_dump_cb);

    /*
     * Start TLS negotiations. This process is a black box that invokes our
     * call-backs for 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_connect(ACL_VSTREAM_SOCK(props->stream), props->timeout,
	    TLScontext);
    if (sts <= 0) {
	acl_msg_info("%s(%d): SSL_connect error to %s: %d",
		myname, __LINE__, props->namaddr, sts);
	tls_print_errors();
	uncache_session(app_ctx->ssl_ctx, TLScontext);
	tls_free_context(TLScontext);
	return (0);
    }
    /* Only log_level==4 dumps everything */
    if (props->log_level < 4)
	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 (props->log_level >= 2 && TLScontext->session_reused)
	acl_msg_info("%s(%d): %s: Reusing old session",
		myname, __LINE__, TLScontext->namaddr);

    /*
     * Do peername verification if requested and extract useful information
     * from the certificate for later use.
     */
    if ((peercert = SSL_get_peer_certificate(TLScontext->con)) != 0) {
	TLScontext->peer_status |= TLS_CERT_FLAG_PRESENT;

	/*
	 * Peer name or fingerprint verification as requested.
	 * Unconditionally set peer_CN, issuer_CN and peer_fingerprint.
	 */
	verify_extract_name(TLScontext, peercert, props);
	verify_extract_print(TLScontext, peercert, props);
	X509_free(peercert);
    } else {
	TLScontext->issuer_CN = acl_mystrdup("");
	TLScontext->peer_CN = acl_mystrdup("");
	TLScontext->peer_fingerprint = acl_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));

    /*
     * The TLS engine is active. Switch to the tls_timed_read/write()
     * functions and make the TLScontext available to those functions.
     */
    tls_stream_start(props->stream, TLScontext);

    /*
     * All the key facts in a single log entry.
     */
    if (props->log_level >= 1)
	acl_msg_info("%s(%d): %s TLS connection established to %s: %s with cipher %s "
		"(%d/%d bits)", myname, __LINE__,
		TLS_CERT_IS_MATCHED(TLScontext) ? "Verified" :
		TLS_CERT_IS_TRUSTED(TLScontext) ? "Trusted" : "Untrusted",
		props->namaddr, TLScontext->protocol, TLScontext->cipher_name,
		TLScontext->cipher_usebits, TLScontext->cipher_algbits);

    tls_int_seed();

    return (TLScontext);
}
Esempio n. 6
0
static void verify_extract_name(TLS_SESS_STATE *TLScontext, X509 *peercert,
	const TLS_CLIENT_START_PROPS *props)
{
    int     i;
    int     r;
    int     matched = 0;
    const char *dnsname;
    const GENERAL_NAME *gn;

    STACK_OF(GENERAL_NAME) * gens;

    /*
     * On exit both peer_CN and issuer_CN should be set.
     */
    TLScontext->issuer_CN = tls_issuer_CN(peercert, TLScontext);

    /*
     * Is the certificate trust chain valid and trusted?
     */
    if (SSL_get_verify_result(TLScontext->con) == X509_V_OK)
	TLScontext->peer_status |= TLS_CERT_FLAG_TRUSTED;

    if (TLS_CERT_IS_TRUSTED(TLScontext) && props->tls_level >= TLS_LEV_VERIFY) {

	/*
	 * Verify the dNSName(s) in the peer certificate against the nexthop
	 * and hostname.
	 * 
	 * If DNS names are present, we use the first matching (or else simply
	 * the first) DNS name as the subject CN. The CommonName in the
	 * issuer DN is obsolete when SubjectAltName is available. This
	 * yields much less surprising logs, because we log the name we
	 * verified or a name we checked and failed to match.
	 * 
	 * XXX: The nexthop and host name may both be the same network address
	 * rather than a DNS name. In this case we really should be looking
	 * for GEN_IPADD entries, not GEN_DNS entries.
	 * 
	 * XXX: In ideal world the caller who used the address to build the
	 * connection would tell us that the nexthop is the connection
	 * address, but if that is not practical, we can parse the nexthop
	 * again here.
	 */
	gens = X509_get_ext_d2i(peercert, NID_subject_alt_name, 0, 0);
	if (gens) {
	    r = sk_GENERAL_NAME_num(gens);
	    for (i = 0; i < r && !matched; ++i) {
		gn = sk_GENERAL_NAME_value(gens, i);
		if (gn->type != GEN_DNS)
		    continue;

		/*
		 * Even if we have an invalid DNS name, we still ultimately
		 * ignore the CommonName, because subjectAltName:DNS is
		 * present (though malformed). Replace any previous peer_CN
		 * if empty or we get a match.
		 * 
		 * We always set at least an empty peer_CN if the ALTNAME cert
		 * flag is set. If not, we set peer_CN from the cert
		 * CommonName below, so peer_CN is always non-null on return.
		 */
		TLScontext->peer_status |= TLS_CERT_FLAG_ALTNAME;
		dnsname = tls_dns_name(gn, TLScontext);
		if (dnsname && *dnsname) {
		    matched = match_hostname(dnsname, props);
		    if (TLScontext->peer_CN
			    && (matched || *TLScontext->peer_CN == 0)) {
			acl_myfree(TLScontext->peer_CN);
			TLScontext->peer_CN = 0;
		    }
		}
		if (TLScontext->peer_CN == 0)
		    TLScontext->peer_CN = acl_mystrdup(dnsname ? dnsname : "");
	    }

	    /*
	     * (Sam Rushing, Ironport) Free stack *and* member GENERAL_NAME
	     * objects
	     */
	    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
	}

	/*
	 * No subjectAltNames, peer_CN is taken from CommonName.
	 */
	if (TLScontext->peer_CN == 0) {
	    TLScontext->peer_CN = tls_peer_CN(peercert, TLScontext);
	    if (*TLScontext->peer_CN)
		matched = match_hostname(TLScontext->peer_CN, props);
	}
	if (matched)
	    TLScontext->peer_status |= TLS_CERT_FLAG_MATCHED;

	/*
	 * - Matched: Trusted and peername matches - Trusted: Signed by
	 * trusted CA(s), but peername not matched - Untrusted: Can't verify
	 * the trust chain, reason already logged.
	 */
	if (TLScontext->log_level >= 2)
	    acl_msg_info("%s: %s subject_CN=%s, issuer_CN=%s", props->namaddr,
		    TLS_CERT_IS_MATCHED(TLScontext) ? "Matched" :
		    TLS_CERT_IS_TRUSTED(TLScontext) ? "Trusted" : "Untrusted",
		    TLScontext->peer_CN, TLScontext->issuer_CN);
    } else
	TLScontext->peer_CN = tls_peer_CN(peercert, TLScontext);

    /*
     * Give them a clue. Problems with trust chain verification were logged
     * when the session was first negotiated, before the session was stored
     * into the cache. We don't want mystery failures, so log the fact the
     * real problem is to be found in the past.
     */
    if (TLScontext->session_reused
	    && !TLS_CERT_IS_TRUSTED(TLScontext)
	    && TLScontext->log_level >= 1)
	acl_msg_info("%s: re-using session with untrusted certificate, "
		"look for details earlier in the log", props->namaddr);
}
Esempio n. 7
0
File: main.c Progetto: 10jschen/acl
static void run_one(TLS_APPL_STATE *client_tls_ctx)
{
	ACL_VSTREAM *client;
	TLS_SESS_STATE *client_sess_ctx;
	TLS_CLIENT_START_PROPS tls_props;
	char  buf[4096];
	int   i, ret;
	time_t last, now;

	int   tls_level = 2;
	char *tls_nexthop = "test.com.cn";
	char *host = "test.com.cn";
	char *namaddrport = "test.com.cn";
	char *serverid = "service:addr:port:helo";
	char *tls_protocols = SSL_TXT_TLSV1;
	char *tls_grade = "low";  /* high, medium, low, export, null */
	char *tls_exclusions = "";
	ACL_ARGV *tls_matchargv = 0;

	client = acl_vstream_connect(serv_addr, ACL_BLOCKING, 20, 30, 8192);
	if (client == NULL) {
		printf("connect %s error(%s)\n", serv_addr, acl_last_serror());
		return;
	}

	acl_tcp_set_nodelay(ACL_VSTREAM_SOCK(client));

#if 0
	client_sess_ctx = TLS_CLIENT_START(&tls_props,
			ctx = client_tls_ctx,
			stream = client,
			log_level = var_client_tls_loglevel,
			timeout = var_client_starttls_tmout,
			tls_level = tls_level,
			nexthop = tls_nexthop,
			host = host,
			namaddr = namaddrport,
			serverid = serverid,
			protocols = tls_protocols,
			cipher_grade = tls_grade,
			cipher_exclusions = tls_exclusions,
			matchargv = tls_matchargv,
			fpt_dgst = var_client_tls_fpt_dgst);
#else
	tls_props.ctx = client_tls_ctx;
	tls_props.stream = client;
	tls_props.log_level = var_client_tls_loglevel;
	tls_props.timeout = var_client_starttls_tmout;
	tls_props.tls_level = tls_level;
	tls_props.nexthop = tls_nexthop;
	tls_props.host = host;
	tls_props.namaddr = namaddrport;
	tls_props.serverid = serverid;
	tls_props.protocols = tls_protocols;
	tls_props.cipher_grade = tls_grade;
	tls_props.cipher_exclusions = tls_exclusions;
	tls_props.matchargv = tls_matchargv;
	tls_props.fpt_dgst = var_client_tls_fpt_dgst;

	client_sess_ctx = tls_client_start(&tls_props);
#endif

	if (client_sess_ctx == NULL) {
		printf("TLS_CLIENT_START error\n");
		acl_vstream_close(client);
		return;
	}

	if (tls_level >= TLS_LEV_VERIFY) {
		if (!TLS_CERT_IS_TRUSTED(client_sess_ctx)) {
			printf("Server certificate not trusted\n");
		}
	}

	if (tls_level > TLS_LEV_ENCRYPT) {
		if (!TLS_CERT_IS_MATCHED(client_sess_ctx)) {
			printf("Server certificate not verified\n");
		}
	}

	time(&last);
	i = 0;
	while (1) {
		ret = acl_vstream_fprintf(client, "hello world\n");
		if (ret == ACL_VSTREAM_EOF)
			goto END;
		ret = acl_vstream_gets(client, buf, sizeof(buf));
		if (ret == ACL_VSTREAM_EOF)
			goto END;
		break;
		i++;
		if (i % 50000 == 0) {
			time(&now);
			printf("client: i=%d, time=%ld\n", i, now - last);
			last = now;
		}
	}

if (0)
{
	if (acl_vstream_writen(client, request, strlen(request)) == ACL_VSTREAM_EOF)
		printf("write request error\n");
	else {
		while (1) {
			if (acl_vstream_gets_nonl(client, buf, sizeof(buf)) == ACL_VSTREAM_EOF)
				break;
			/*
			printf("%s\n", buf);
			*/
		}
		/*
		printf("gets respond over now\n");
		*/
	}
}

END:
	tls_client_stop(client_tls_ctx, client, var_client_starttls_tmout, 0, client_sess_ctx);
	acl_vstream_close(client);
}