2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/bio.h>
13 #include <openssl/x509_vfy.h>
14 #include <openssl/ssl.h>
16 #include "handshake_helper.h"
19 HANDSHAKE_RESULT *HANDSHAKE_RESULT_new()
21 HANDSHAKE_RESULT *ret = OPENSSL_zalloc(sizeof(*ret));
22 TEST_check(ret != NULL);
26 void HANDSHAKE_RESULT_free(HANDSHAKE_RESULT *result)
28 OPENSSL_free(result->client_npn_negotiated);
29 OPENSSL_free(result->server_npn_negotiated);
30 OPENSSL_free(result->client_alpn_negotiated);
31 OPENSSL_free(result->server_alpn_negotiated);
36 * Since there appears to be no way to extract the sent/received alert
37 * from the SSL object directly, we use the info callback and stash
38 * the result in ex_data.
40 typedef struct handshake_ex_data {
43 int session_ticket_do_not_call;
44 ssl_servername_t servername;
47 typedef struct ctx_data {
48 unsigned char *npn_protocols;
49 size_t npn_protocols_len;
50 unsigned char *alpn_protocols;
51 size_t alpn_protocols_len;
54 /* |ctx_data| itself is stack-allocated. */
55 static void ctx_data_free_data(CTX_DATA *ctx_data)
57 OPENSSL_free(ctx_data->npn_protocols);
58 ctx_data->npn_protocols = NULL;
59 OPENSSL_free(ctx_data->alpn_protocols);
60 ctx_data->alpn_protocols = NULL;
63 static int ex_data_idx;
65 static void info_cb(const SSL *s, int where, int ret)
67 if (where & SSL_CB_ALERT) {
68 HANDSHAKE_EX_DATA *ex_data =
69 (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
70 if (where & SSL_CB_WRITE) {
71 ex_data->alert_sent = ret;
73 ex_data->alert_received = ret;
78 /* Select the appropriate server CTX.
79 * Returns SSL_TLSEXT_ERR_OK if a match was found.
80 * If |ignore| is 1, returns SSL_TLSEXT_ERR_NOACK on mismatch.
81 * Otherwise, returns SSL_TLSEXT_ERR_ALERT_FATAL on mismatch.
82 * An empty SNI extension also returns SSL_TSLEXT_ERR_NOACK.
84 static int select_server_ctx(SSL *s, void *arg, int ignore)
86 const char *servername = SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
87 HANDSHAKE_EX_DATA *ex_data =
88 (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
90 if (servername == NULL) {
91 ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
92 return SSL_TLSEXT_ERR_NOACK;
95 if (strcmp(servername, "server2") == 0) {
96 SSL_CTX *new_ctx = (SSL_CTX*)arg;
97 SSL_set_SSL_CTX(s, new_ctx);
99 * Copy over all the SSL_CTX options - reasonable behavior
100 * allows testing of cases where the options between two
101 * contexts differ/conflict
103 SSL_clear_options(s, 0xFFFFFFFFL);
104 SSL_set_options(s, SSL_CTX_get_options(new_ctx));
106 ex_data->servername = SSL_TEST_SERVERNAME_SERVER2;
107 return SSL_TLSEXT_ERR_OK;
108 } else if (strcmp(servername, "server1") == 0) {
109 ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
110 return SSL_TLSEXT_ERR_OK;
112 ex_data->servername = SSL_TEST_SERVERNAME_SERVER1;
113 return SSL_TLSEXT_ERR_NOACK;
115 /* Don't set an explicit alert, to test library defaults. */
116 return SSL_TLSEXT_ERR_ALERT_FATAL;
122 * If the server understood the ClientHello extension but
123 * does not recognize the server name, the server SHOULD take one of two
124 * actions: either abort the handshake by sending a fatal-level
125 * unrecognized_name(112) alert or continue the handshake.
127 * This behaviour is up to the application to configure; we test both
128 * configurations to ensure the state machine propagates the result
131 static int servername_ignore_cb(SSL *s, int *ad, void *arg)
133 return select_server_ctx(s, arg, 1);
136 static int servername_reject_cb(SSL *s, int *ad, void *arg)
138 return select_server_ctx(s, arg, 0);
141 static int verify_reject_cb(X509_STORE_CTX *ctx, void *arg) {
142 X509_STORE_CTX_set_error(ctx, X509_V_ERR_APPLICATION_VERIFICATION);
146 static int verify_accept_cb(X509_STORE_CTX *ctx, void *arg) {
150 static int broken_session_ticket_cb(SSL *s, unsigned char *key_name, unsigned char *iv,
151 EVP_CIPHER_CTX *ctx, HMAC_CTX *hctx, int enc)
156 static int do_not_call_session_ticket_cb(SSL *s, unsigned char *key_name,
159 HMAC_CTX *hctx, int enc)
161 HANDSHAKE_EX_DATA *ex_data =
162 (HANDSHAKE_EX_DATA*)(SSL_get_ex_data(s, ex_data_idx));
163 ex_data->session_ticket_do_not_call = 1;
167 /* Parse the comma-separated list into TLS format. */
168 static void parse_protos(const char *protos, unsigned char **out, size_t *outlen)
170 size_t len, i, prefix;
172 len = strlen(protos);
174 /* Should never have reuse. */
175 TEST_check(*out == NULL);
177 /* Test values are small, so we omit length limit checks. */
178 *out = OPENSSL_malloc(len + 1);
179 TEST_check(*out != NULL);
183 * foo => '3', 'f', 'o', 'o'
184 * foo,bar => '3', 'f', 'o', 'o', '3', 'b', 'a', 'r'
186 memcpy(*out + 1, protos, len);
191 if ((*out)[i] == ',') {
192 TEST_check(i - 1 - prefix > 0);
193 (*out)[prefix] = i - 1 - prefix;
198 TEST_check(len - prefix > 0);
199 (*out)[prefix] = len - prefix;
202 #ifndef OPENSSL_NO_NEXTPROTONEG
204 * The client SHOULD select the first protocol advertised by the server that it
205 * also supports. In the event that the client doesn't support any of server's
206 * protocols, or the server doesn't advertise any, it SHOULD select the first
207 * protocol that it supports.
209 static int client_npn_cb(SSL *s, unsigned char **out, unsigned char *outlen,
210 const unsigned char *in, unsigned int inlen,
213 CTX_DATA *ctx_data = (CTX_DATA*)(arg);
216 ret = SSL_select_next_proto(out, outlen, in, inlen,
217 ctx_data->npn_protocols,
218 ctx_data->npn_protocols_len);
219 /* Accept both OPENSSL_NPN_NEGOTIATED and OPENSSL_NPN_NO_OVERLAP. */
220 TEST_check(ret == OPENSSL_NPN_NEGOTIATED || ret == OPENSSL_NPN_NO_OVERLAP);
221 return SSL_TLSEXT_ERR_OK;
224 static int server_npn_cb(SSL *s, const unsigned char **data,
225 unsigned int *len, void *arg)
227 CTX_DATA *ctx_data = (CTX_DATA*)(arg);
228 *data = ctx_data->npn_protocols;
229 *len = ctx_data->npn_protocols_len;
230 return SSL_TLSEXT_ERR_OK;
235 * The server SHOULD select the most highly preferred protocol that it supports
236 * and that is also advertised by the client. In the event that the server
237 * supports no protocols that the client advertises, then the server SHALL
238 * respond with a fatal "no_application_protocol" alert.
240 static int server_alpn_cb(SSL *s, const unsigned char **out,
241 unsigned char *outlen, const unsigned char *in,
242 unsigned int inlen, void *arg)
244 CTX_DATA *ctx_data = (CTX_DATA*)(arg);
247 /* SSL_select_next_proto isn't const-correct... */
248 unsigned char *tmp_out;
251 * The result points either to |in| or to |ctx_data->alpn_protocols|.
252 * The callback is allowed to point to |in| or to a long-lived buffer,
253 * so we can return directly without storing a copy.
255 ret = SSL_select_next_proto(&tmp_out, outlen,
256 ctx_data->alpn_protocols,
257 ctx_data->alpn_protocols_len, in, inlen);
260 /* Unlike NPN, we don't tolerate a mismatch. */
261 return ret == OPENSSL_NPN_NEGOTIATED ? SSL_TLSEXT_ERR_OK
262 : SSL_TLSEXT_ERR_NOACK;
266 * Configure callbacks and other properties that can't be set directly
267 * in the server/client CONF.
269 static void configure_handshake_ctx(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
271 const SSL_TEST_EXTRA_CONF *extra,
272 CTX_DATA *server_ctx_data,
273 CTX_DATA *server2_ctx_data,
274 CTX_DATA *client_ctx_data)
276 unsigned char *ticket_keys;
277 size_t ticket_key_len;
279 switch (extra->client.verify_callback) {
280 case SSL_TEST_VERIFY_ACCEPT_ALL:
281 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_accept_cb,
284 case SSL_TEST_VERIFY_REJECT_ALL:
285 SSL_CTX_set_cert_verify_callback(client_ctx, &verify_reject_cb,
292 /* link the two contexts for SNI purposes */
293 switch (extra->server.servername_callback) {
294 case SSL_TEST_SERVERNAME_IGNORE_MISMATCH:
295 SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_ignore_cb);
296 SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
298 case SSL_TEST_SERVERNAME_REJECT_MISMATCH:
299 SSL_CTX_set_tlsext_servername_callback(server_ctx, servername_reject_cb);
300 SSL_CTX_set_tlsext_servername_arg(server_ctx, server2_ctx);
307 * The initial_ctx/session_ctx always handles the encrypt/decrypt of the
308 * session ticket. This ticket_key callback is assigned to the second
309 * session (assigned via SNI), and should never be invoked
311 if (server2_ctx != NULL)
312 SSL_CTX_set_tlsext_ticket_key_cb(server2_ctx,
313 do_not_call_session_ticket_cb);
315 if (extra->server.broken_session_ticket) {
316 SSL_CTX_set_tlsext_ticket_key_cb(server_ctx, broken_session_ticket_cb);
318 #ifndef OPENSSL_NO_NEXTPROTONEG
319 if (extra->server.npn_protocols != NULL) {
320 parse_protos(extra->server.npn_protocols,
321 &server_ctx_data->npn_protocols,
322 &server_ctx_data->npn_protocols_len);
323 SSL_CTX_set_next_protos_advertised_cb(server_ctx, server_npn_cb,
326 if (extra->server2.npn_protocols != NULL) {
327 parse_protos(extra->server2.npn_protocols,
328 &server2_ctx_data->npn_protocols,
329 &server2_ctx_data->npn_protocols_len);
330 TEST_check(server2_ctx != NULL);
331 SSL_CTX_set_next_protos_advertised_cb(server2_ctx, server_npn_cb,
334 if (extra->client.npn_protocols != NULL) {
335 parse_protos(extra->client.npn_protocols,
336 &client_ctx_data->npn_protocols,
337 &client_ctx_data->npn_protocols_len);
338 SSL_CTX_set_next_proto_select_cb(client_ctx, client_npn_cb,
342 if (extra->server.alpn_protocols != NULL) {
343 parse_protos(extra->server.alpn_protocols,
344 &server_ctx_data->alpn_protocols,
345 &server_ctx_data->alpn_protocols_len);
346 SSL_CTX_set_alpn_select_cb(server_ctx, server_alpn_cb, server_ctx_data);
348 if (extra->server2.alpn_protocols != NULL) {
349 TEST_check(server2_ctx != NULL);
350 parse_protos(extra->server2.alpn_protocols,
351 &server2_ctx_data->alpn_protocols,
352 &server2_ctx_data->alpn_protocols_len);
353 SSL_CTX_set_alpn_select_cb(server2_ctx, server_alpn_cb, server2_ctx_data);
355 if (extra->client.alpn_protocols != NULL) {
356 unsigned char *alpn_protos = NULL;
357 size_t alpn_protos_len;
358 parse_protos(extra->client.alpn_protocols,
359 &alpn_protos, &alpn_protos_len);
360 /* Reversed return value convention... */
361 TEST_check(SSL_CTX_set_alpn_protos(client_ctx, alpn_protos,
362 alpn_protos_len) == 0);
363 OPENSSL_free(alpn_protos);
367 * Use fixed session ticket keys so that we can decrypt a ticket created with
368 * one CTX in another CTX. Don't address server2 for the moment.
370 ticket_key_len = SSL_CTX_set_tlsext_ticket_keys(server_ctx, NULL, 0);
371 ticket_keys = OPENSSL_zalloc(ticket_key_len);
372 TEST_check(ticket_keys != NULL);
373 TEST_check(SSL_CTX_set_tlsext_ticket_keys(server_ctx, ticket_keys,
374 ticket_key_len) == 1);
375 OPENSSL_free(ticket_keys);
377 #ifndef OPENSSL_NO_CT
378 TEST_check(SSL_CTX_set_default_ctlog_list_file(client_ctx));
379 switch (extra->client.ct_validation) {
380 case SSL_TEST_CT_VALIDATION_PERMISSIVE:
381 TEST_check(SSL_CTX_enable_ct(client_ctx, SSL_CT_VALIDATION_PERMISSIVE));
383 case SSL_TEST_CT_VALIDATION_STRICT:
384 TEST_check(SSL_CTX_enable_ct(client_ctx, SSL_CT_VALIDATION_STRICT));
386 case SSL_TEST_CT_VALIDATION_NONE:
392 /* Configure per-SSL callbacks and other properties. */
393 static void configure_handshake_ssl(SSL *server, SSL *client,
394 const SSL_TEST_EXTRA_CONF *extra)
396 if (extra->client.servername != SSL_TEST_SERVERNAME_NONE)
397 SSL_set_tlsext_host_name(client,
398 ssl_servername_name(extra->client.servername));
411 * Note that as of TLS 1.1,
412 * failure to properly close a connection no longer requires that a
413 * session not be resumed. This is a change from TLS 1.0 to conform
414 * with widespread implementation practice.
417 * (a) OpenSSL requires that a connection be shutdown for all protocol versions.
418 * (b) We test lower versions, too.
419 * So we just implement shutdown. We do a full bidirectional shutdown so that we
420 * can compare sent and received close_notify alerts and get some test coverage
421 * for SSL_shutdown as a bonus.
423 static peer_status_t do_handshake_step(SSL *ssl, int shutdown)
427 ret = shutdown ? SSL_shutdown(ssl) : SSL_do_handshake(ssl);
431 } else if (ret == 0) {
432 return shutdown ? PEER_RETRY : PEER_ERROR;
434 int error = SSL_get_error(ssl, ret);
435 /* Memory bios should never block with SSL_ERROR_WANT_WRITE. */
436 if (error == SSL_ERROR_WANT_READ)
444 /* Both parties succeeded. */
446 /* Client errored. */
448 /* Server errored. */
450 /* Peers are in inconsistent state. */
452 /* One or both peers not done. */
454 } handshake_status_t;
457 * Determine the handshake outcome.
458 * last_status: the status of the peer to have acted last.
459 * previous_status: the status of the peer that didn't act last.
460 * client_spoke_last: 1 if the client went last.
462 static handshake_status_t handshake_status(peer_status_t last_status,
463 peer_status_t previous_status,
464 int client_spoke_last)
466 switch (last_status) {
468 switch (previous_status) {
470 /* Both succeeded. */
471 return HANDSHAKE_SUCCESS;
473 /* Let the first peer finish. */
474 return HANDSHAKE_RETRY;
477 * Second peer succeeded despite the fact that the first peer
478 * already errored. This shouldn't happen.
480 return INTERNAL_ERROR;
484 if (previous_status == PEER_RETRY) {
485 /* Neither peer is done. */
486 return HANDSHAKE_RETRY;
489 * Deadlock: second peer is waiting for more input while first
490 * peer thinks they're done (no more input is coming).
492 return INTERNAL_ERROR;
495 switch (previous_status) {
498 * First peer succeeded but second peer errored.
499 * TODO(emilia): we should be able to continue here (with some
500 * application data?) to ensure the first peer receives the
501 * alert / close_notify.
503 return client_spoke_last ? CLIENT_ERROR : SERVER_ERROR;
505 /* We errored; let the peer finish. */
506 return HANDSHAKE_RETRY;
508 /* Both peers errored. Return the one that errored first. */
509 return client_spoke_last ? SERVER_ERROR : CLIENT_ERROR;
512 /* Control should never reach here. */
513 return INTERNAL_ERROR;
516 /* Convert unsigned char buf's that shouldn't contain any NUL-bytes to char. */
517 static char *dup_str(const unsigned char *in, size_t len)
524 /* Assert that the string does not contain NUL-bytes. */
525 TEST_check(OPENSSL_strnlen((const char*)(in), len) == len);
526 ret = OPENSSL_strndup((const char*)(in), len);
527 TEST_check(ret != NULL);
531 static HANDSHAKE_RESULT *do_handshake_internal(
532 SSL_CTX *server_ctx, SSL_CTX *server2_ctx, SSL_CTX *client_ctx,
533 const SSL_TEST_EXTRA_CONF *extra, SSL_SESSION *session_in,
534 SSL_SESSION **session_out)
536 SSL *server, *client;
537 BIO *client_to_server, *server_to_client;
538 HANDSHAKE_EX_DATA server_ex_data, client_ex_data;
539 CTX_DATA client_ctx_data, server_ctx_data, server2_ctx_data;
540 HANDSHAKE_RESULT *ret = HANDSHAKE_RESULT_new();
541 int client_turn = 1, shutdown = 0;
542 peer_status_t client_status = PEER_RETRY, server_status = PEER_RETRY;
543 handshake_status_t status = HANDSHAKE_RETRY;
544 unsigned char* tick = NULL;
546 SSL_SESSION* sess = NULL;
547 const unsigned char *proto = NULL;
548 /* API dictates unsigned int rather than size_t. */
549 unsigned int proto_len = 0;
551 memset(&server_ctx_data, 0, sizeof(server_ctx_data));
552 memset(&server2_ctx_data, 0, sizeof(server2_ctx_data));
553 memset(&client_ctx_data, 0, sizeof(client_ctx_data));
555 configure_handshake_ctx(server_ctx, server2_ctx, client_ctx, extra,
556 &server_ctx_data, &server2_ctx_data, &client_ctx_data);
558 server = SSL_new(server_ctx);
559 client = SSL_new(client_ctx);
560 TEST_check(server != NULL);
561 TEST_check(client != NULL);
563 configure_handshake_ssl(server, client, extra);
564 if (session_in != NULL) {
565 /* In case we're testing resumption without tickets. */
566 TEST_check(SSL_CTX_add_session(server_ctx, session_in));
567 TEST_check(SSL_set_session(client, session_in));
570 memset(&server_ex_data, 0, sizeof(server_ex_data));
571 memset(&client_ex_data, 0, sizeof(client_ex_data));
573 ret->result = SSL_TEST_INTERNAL_ERROR;
575 client_to_server = BIO_new(BIO_s_mem());
576 server_to_client = BIO_new(BIO_s_mem());
578 TEST_check(client_to_server != NULL && server_to_client != NULL);
580 /* Non-blocking bio. */
581 BIO_set_nbio(client_to_server, 1);
582 BIO_set_nbio(server_to_client, 1);
584 SSL_set_connect_state(client);
585 SSL_set_accept_state(server);
587 /* The bios are now owned by the SSL object. */
588 SSL_set_bio(client, server_to_client, client_to_server);
589 TEST_check(BIO_up_ref(server_to_client) > 0);
590 TEST_check(BIO_up_ref(client_to_server) > 0);
591 SSL_set_bio(server, client_to_server, server_to_client);
593 ex_data_idx = SSL_get_ex_new_index(0, "ex data", NULL, NULL, NULL);
594 TEST_check(ex_data_idx >= 0);
596 TEST_check(SSL_set_ex_data(server, ex_data_idx,
597 &server_ex_data) == 1);
598 TEST_check(SSL_set_ex_data(client, ex_data_idx,
599 &client_ex_data) == 1);
601 SSL_set_info_callback(server, &info_cb);
602 SSL_set_info_callback(client, &info_cb);
605 * Half-duplex handshake loop.
606 * Client and server speak to each other synchronously in the same process.
607 * We use non-blocking BIOs, so whenever one peer blocks for read, it
608 * returns PEER_RETRY to indicate that it's the other peer's turn to write.
609 * The handshake succeeds once both peers have succeeded. If one peer
610 * errors out, we also let the other peer retry (and presumably fail).
614 client_status = do_handshake_step(client, shutdown);
615 status = handshake_status(client_status, server_status,
616 1 /* client went last */);
618 server_status = do_handshake_step(server, shutdown);
619 status = handshake_status(server_status, client_status,
620 0 /* server went last */);
624 case HANDSHAKE_SUCCESS:
626 ret->result = SSL_TEST_SUCCESS;
629 client_status = server_status = PEER_RETRY;
635 ret->result = SSL_TEST_CLIENT_FAIL;
638 ret->result = SSL_TEST_SERVER_FAIL;
641 ret->result = SSL_TEST_INTERNAL_ERROR;
643 case HANDSHAKE_RETRY:
650 ret->server_alert_sent = server_ex_data.alert_sent;
651 ret->server_alert_received = client_ex_data.alert_received;
652 ret->client_alert_sent = client_ex_data.alert_sent;
653 ret->client_alert_received = server_ex_data.alert_received;
654 ret->server_protocol = SSL_version(server);
655 ret->client_protocol = SSL_version(client);
656 ret->servername = server_ex_data.servername;
657 if ((sess = SSL_get0_session(client)) != NULL)
658 SSL_SESSION_get0_ticket(sess, &tick, &tick_len);
659 if (tick == NULL || tick_len == 0)
660 ret->session_ticket = SSL_TEST_SESSION_TICKET_NO;
662 ret->session_ticket = SSL_TEST_SESSION_TICKET_YES;
663 ret->session_ticket_do_not_call = server_ex_data.session_ticket_do_not_call;
665 #ifndef OPENSSL_NO_NEXTPROTONEG
666 SSL_get0_next_proto_negotiated(client, &proto, &proto_len);
667 ret->client_npn_negotiated = dup_str(proto, proto_len);
669 SSL_get0_next_proto_negotiated(server, &proto, &proto_len);
670 ret->server_npn_negotiated = dup_str(proto, proto_len);
673 SSL_get0_alpn_selected(client, &proto, &proto_len);
674 ret->client_alpn_negotiated = dup_str(proto, proto_len);
676 SSL_get0_alpn_selected(server, &proto, &proto_len);
677 ret->server_alpn_negotiated = dup_str(proto, proto_len);
679 ret->client_resumed = SSL_session_reused(client);
680 ret->server_resumed = SSL_session_reused(server);
682 if (session_out != NULL)
683 *session_out = SSL_get1_session(client);
685 ctx_data_free_data(&server_ctx_data);
686 ctx_data_free_data(&server2_ctx_data);
687 ctx_data_free_data(&client_ctx_data);
694 HANDSHAKE_RESULT *do_handshake(SSL_CTX *server_ctx, SSL_CTX *server2_ctx,
695 SSL_CTX *client_ctx, SSL_CTX *resume_server_ctx,
696 SSL_CTX *resume_client_ctx,
697 const SSL_TEST_CTX *test_ctx)
699 HANDSHAKE_RESULT *result;
700 SSL_SESSION *session = NULL;
702 result = do_handshake_internal(server_ctx, server2_ctx, client_ctx,
703 &test_ctx->extra, NULL, &session);
704 if (test_ctx->handshake_mode == SSL_TEST_HANDSHAKE_SIMPLE)
707 TEST_check(test_ctx->handshake_mode == SSL_TEST_HANDSHAKE_RESUME);
709 if (result->result != SSL_TEST_SUCCESS) {
710 result->result = SSL_TEST_FIRST_HANDSHAKE_FAILED;
714 HANDSHAKE_RESULT_free(result);
715 /* We don't support SNI on second handshake yet, so server2_ctx is NULL. */
716 result = do_handshake_internal(resume_server_ctx, NULL, resume_client_ctx,
717 &test_ctx->resume_extra, session, NULL);
719 SSL_SESSION_free(session);