2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2005 Nokia. All rights reserved.
5 * Licensed under the OpenSSL license (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
12 #include <openssl/lhash.h>
13 #include <openssl/rand.h>
14 #include <openssl/engine.h>
16 #include "statem/statem_locl.h"
18 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
19 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
20 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
23 * SSL_get_session() and SSL_get1_session() are problematic in TLS1.3 because,
24 * unlike in earlier protocol versions, the session ticket may not have been
25 * sent yet even though a handshake has finished. The session ticket data could
26 * come in sometime later...or even change if multiple session ticket messages
27 * are sent from the server. The preferred way for applications to obtain
28 * a resumable session is to use SSL_CTX_sess_set_new_cb().
31 SSL_SESSION *SSL_get_session(const SSL *ssl)
32 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
34 return (ssl->session);
37 SSL_SESSION *SSL_get1_session(SSL *ssl)
38 /* variant of SSL_get_session: caller really gets something */
42 * Need to lock this all up rather than just use CRYPTO_add so that
43 * somebody doesn't free ssl->session between when we check it's non-null
44 * and when we up the reference count.
46 CRYPTO_THREAD_read_lock(ssl->lock);
49 SSL_SESSION_up_ref(sess);
50 CRYPTO_THREAD_unlock(ssl->lock);
54 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
56 return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
59 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
61 return (CRYPTO_get_ex_data(&s->ex_data, idx));
64 SSL_SESSION *SSL_SESSION_new(void)
68 if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL))
71 ss = OPENSSL_zalloc(sizeof(*ss));
73 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE);
77 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
79 ss->timeout = 60 * 5 + 4; /* 5 minute timeout by default */
80 ss->time = (unsigned long)time(NULL);
81 ss->lock = CRYPTO_THREAD_lock_new();
82 if (ss->lock == NULL) {
83 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE);
88 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data)) {
89 CRYPTO_THREAD_lock_free(ss->lock);
97 * Create a new SSL_SESSION and duplicate the contents of |src| into it. If
98 * ticket == 0 then no ticket information is duplicated, otherwise it is.
100 SSL_SESSION *ssl_session_dup(SSL_SESSION *src, int ticket)
104 dest = OPENSSL_malloc(sizeof(*src));
108 memcpy(dest, src, sizeof(*dest));
111 * Set the various pointers to NULL so that we can call SSL_SESSION_free in
112 * the case of an error whilst halfway through constructing dest
114 #ifndef OPENSSL_NO_PSK
115 dest->psk_identity_hint = NULL;
116 dest->psk_identity = NULL;
118 dest->ciphers = NULL;
119 dest->ext.hostname = NULL;
120 #ifndef OPENSSL_NO_EC
121 dest->ext.ecpointformats = NULL;
122 dest->ext.supportedgroups = NULL;
124 dest->ext.tick = NULL;
125 dest->ext.alpn_selected = NULL;
126 #ifndef OPENSSL_NO_SRP
127 dest->srp_username = NULL;
129 dest->peer_chain = NULL;
131 dest->ext.tick_nonce = NULL;
132 memset(&dest->ex_data, 0, sizeof(dest->ex_data));
134 /* We deliberately don't copy the prev and next pointers */
138 dest->references = 1;
140 dest->lock = CRYPTO_THREAD_lock_new();
141 if (dest->lock == NULL)
144 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, dest, &dest->ex_data))
147 if (src->peer != NULL) {
148 if (!X509_up_ref(src->peer))
150 dest->peer = src->peer;
153 if (src->peer_chain != NULL) {
154 dest->peer_chain = X509_chain_up_ref(src->peer_chain);
155 if (dest->peer_chain == NULL)
158 #ifndef OPENSSL_NO_PSK
159 if (src->psk_identity_hint) {
160 dest->psk_identity_hint = OPENSSL_strdup(src->psk_identity_hint);
161 if (dest->psk_identity_hint == NULL) {
165 if (src->psk_identity) {
166 dest->psk_identity = OPENSSL_strdup(src->psk_identity);
167 if (dest->psk_identity == NULL) {
173 if (src->ciphers != NULL) {
174 dest->ciphers = sk_SSL_CIPHER_dup(src->ciphers);
175 if (dest->ciphers == NULL)
179 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION,
180 &dest->ex_data, &src->ex_data)) {
184 if (src->ext.hostname) {
185 dest->ext.hostname = OPENSSL_strdup(src->ext.hostname);
186 if (dest->ext.hostname == NULL) {
190 #ifndef OPENSSL_NO_EC
191 if (src->ext.ecpointformats) {
192 dest->ext.ecpointformats =
193 OPENSSL_memdup(src->ext.ecpointformats,
194 src->ext.ecpointformats_len);
195 if (dest->ext.ecpointformats == NULL)
198 if (src->ext.supportedgroups) {
199 dest->ext.supportedgroups =
200 OPENSSL_memdup(src->ext.supportedgroups,
201 src->ext.supportedgroups_len);
202 if (dest->ext.supportedgroups == NULL)
207 if (ticket != 0 && src->ext.tick != NULL) {
209 OPENSSL_memdup(src->ext.tick, src->ext.ticklen);
210 if (dest->ext.tick == NULL)
213 dest->ext.tick_lifetime_hint = 0;
214 dest->ext.ticklen = 0;
217 if (src->ext.alpn_selected) {
218 dest->ext.alpn_selected =
219 (unsigned char*)OPENSSL_strndup((char*)src->ext.alpn_selected,
220 src->ext.alpn_selected_len);
221 if (dest->ext.alpn_selected == NULL) {
226 if (src->ext.tick_nonce != NULL) {
227 dest->ext.tick_nonce = OPENSSL_memdup(src->ext.tick_nonce,
228 src->ext.tick_nonce_len);
229 if (dest->ext.tick_nonce == NULL)
233 #ifndef OPENSSL_NO_SRP
234 if (src->srp_username) {
235 dest->srp_username = OPENSSL_strdup(src->srp_username);
236 if (dest->srp_username == NULL) {
244 SSLerr(SSL_F_SSL_SESSION_DUP, ERR_R_MALLOC_FAILURE);
245 SSL_SESSION_free(dest);
249 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
252 *len = (unsigned int)s->session_id_length;
253 return s->session_id;
255 const unsigned char *SSL_SESSION_get0_id_context(const SSL_SESSION *s,
259 *len = (unsigned int)s->sid_ctx_length;
263 unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s)
265 return s->compress_meth;
269 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
270 * the ID with random junk repeatedly until we have no conflict is going to
271 * complete in one iteration pretty much "most" of the time (btw:
272 * understatement). So, if it takes us 10 iterations and we still can't avoid
273 * a conflict - well that's a reasonable point to call it quits. Either the
274 * RAND code is broken or someone is trying to open roughly very close to
275 * 2^256 SSL sessions to our server. How you might store that many sessions
276 * is perhaps a more interesting question ...
279 #define MAX_SESS_ID_ATTEMPTS 10
280 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
281 unsigned int *id_len)
283 unsigned int retry = 0;
285 if (RAND_bytes(id, *id_len) <= 0)
287 while (SSL_has_matching_session_id(ssl, id, *id_len) &&
288 (++retry < MAX_SESS_ID_ATTEMPTS)) ;
289 if (retry < MAX_SESS_ID_ATTEMPTS)
291 /* else - woops a session_id match */
293 * XXX We should also check the external cache -- but the probability of
294 * a collision is negligible, and we could not prevent the concurrent
295 * creation of sessions with identical IDs since we currently don't have
296 * means to atomically check whether a session ID already exists and make
297 * a reservation for it if it does not (this problem applies to the
298 * internal cache as well).
303 int ssl_get_new_session(SSL *s, int session)
305 /* This gets used by clients and servers. */
308 SSL_SESSION *ss = NULL;
309 GEN_SESSION_CB cb = def_generate_session_id;
311 if ((ss = SSL_SESSION_new()) == NULL)
314 /* If the context has a default timeout, use it */
315 if (s->session_ctx->session_timeout == 0)
316 ss->timeout = SSL_get_default_timeout(s);
318 ss->timeout = s->session_ctx->session_timeout;
320 SSL_SESSION_free(s->session);
324 if (s->version == SSL3_VERSION) {
325 ss->ssl_version = SSL3_VERSION;
326 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
327 } else if (s->version == TLS1_VERSION) {
328 ss->ssl_version = TLS1_VERSION;
329 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
330 } else if (s->version == TLS1_1_VERSION) {
331 ss->ssl_version = TLS1_1_VERSION;
332 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
333 } else if (s->version == TLS1_2_VERSION) {
334 ss->ssl_version = TLS1_2_VERSION;
335 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
336 } else if (s->version == TLS1_3_VERSION) {
337 ss->ssl_version = TLS1_3_VERSION;
338 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
339 } else if (s->version == DTLS1_BAD_VER) {
340 ss->ssl_version = DTLS1_BAD_VER;
341 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
342 } else if (s->version == DTLS1_VERSION) {
343 ss->ssl_version = DTLS1_VERSION;
344 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
345 } else if (s->version == DTLS1_2_VERSION) {
346 ss->ssl_version = DTLS1_2_VERSION;
347 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
349 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION);
350 SSL_SESSION_free(ss);
355 * If RFC5077 ticket, use empty session ID (as server).
357 * (a) ssl_get_prev_session() does lookahead into the
358 * ClientHello extensions to find the session ticket.
359 * When ssl_get_prev_session() fails, statem_srvr.c calls
360 * ssl_get_new_session() in tls_process_client_hello().
361 * At that point, it has not yet parsed the extensions,
362 * however, because of the lookahead, it already knows
363 * whether a ticket is expected or not.
365 * (b) statem_clnt.c calls ssl_get_new_session() before parsing
366 * ServerHello extensions, and before recording the session
367 * ID received from the server, so this block is a noop.
369 if (s->ext.ticket_expected) {
370 ss->session_id_length = 0;
374 /* Choose which callback will set the session ID */
375 CRYPTO_THREAD_read_lock(s->lock);
376 CRYPTO_THREAD_read_lock(s->session_ctx->lock);
377 if (s->generate_session_id)
378 cb = s->generate_session_id;
379 else if (s->session_ctx->generate_session_id)
380 cb = s->session_ctx->generate_session_id;
381 CRYPTO_THREAD_unlock(s->session_ctx->lock);
382 CRYPTO_THREAD_unlock(s->lock);
383 /* Choose a session ID */
384 memset(ss->session_id, 0, ss->session_id_length);
385 tmp = (int)ss->session_id_length;
386 if (!cb(s, ss->session_id, &tmp)) {
387 /* The callback failed */
388 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
389 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
390 SSL_SESSION_free(ss);
394 * Don't allow the callback to set the session length to zero. nor
395 * set it higher than it was.
397 if (tmp == 0 || tmp > ss->session_id_length) {
398 /* The callback set an illegal length */
399 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
400 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
401 SSL_SESSION_free(ss);
404 ss->session_id_length = tmp;
405 /* Finally, check for a conflict */
406 if (SSL_has_matching_session_id(s, ss->session_id,
407 (unsigned int)ss->session_id_length)) {
408 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_SSL_SESSION_ID_CONFLICT);
409 SSL_SESSION_free(ss);
414 if (s->ext.hostname) {
415 ss->ext.hostname = OPENSSL_strdup(s->ext.hostname);
416 if (ss->ext.hostname == NULL) {
417 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
418 SSL_SESSION_free(ss);
423 ss->session_id_length = 0;
426 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
427 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
428 SSL_SESSION_free(ss);
431 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
432 ss->sid_ctx_length = s->sid_ctx_length;
434 ss->ssl_version = s->version;
435 ss->verify_result = X509_V_OK;
437 /* If client supports extended master secret set it in session */
438 if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS)
439 ss->flags |= SSL_SESS_FLAG_EXTMS;
445 * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
446 * connection. It is only called by servers.
448 * hello: The parsed ClientHello data
452 * 0: no session found
453 * 1: a session may have been found.
456 * - If a session is found then s->session is pointed at it (after freeing an
457 * existing session if need be) and s->verify_result is set from the session.
458 * - Both for new and resumed sessions, s->ext.ticket_expected is set to 1
459 * if the server should issue a new session ticket (to 0 otherwise).
461 int ssl_get_prev_session(SSL *s, CLIENTHELLO_MSG *hello, int *al)
463 /* This is used only by servers. */
465 SSL_SESSION *ret = NULL;
467 int try_session_cache = 0;
470 if (SSL_IS_TLS13(s)) {
471 if (!tls_parse_extension(s, TLSEXT_IDX_psk_kex_modes,
472 SSL_EXT_CLIENT_HELLO, hello->pre_proc_exts,
474 || !tls_parse_extension(s, TLSEXT_IDX_psk, SSL_EXT_CLIENT_HELLO,
475 hello->pre_proc_exts, NULL, 0, al))
480 /* sets s->ext.ticket_expected */
481 r = tls_get_ticket_from_client(s, hello, &ret);
483 case TICKET_FATAL_ERR_MALLOC:
484 case TICKET_FATAL_ERR_OTHER:
489 try_session_cache = 1;
491 case TICKET_NO_DECRYPT:
493 case TICKET_SUCCESS_RENEW:
498 if (try_session_cache &&
500 !(s->session_ctx->session_cache_mode &
501 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
504 data.ssl_version = s->version;
505 memcpy(data.session_id, hello->session_id, hello->session_id_len);
506 data.session_id_length = hello->session_id_len;
508 CRYPTO_THREAD_read_lock(s->session_ctx->lock);
509 ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
511 /* don't allow other threads to steal it: */
512 SSL_SESSION_up_ref(ret);
514 CRYPTO_THREAD_unlock(s->session_ctx->lock);
516 s->session_ctx->stats.sess_miss++;
519 if (try_session_cache &&
520 ret == NULL && s->session_ctx->get_session_cb != NULL) {
523 ret = s->session_ctx->get_session_cb(s, hello->session_id,
524 hello->session_id_len,
528 s->session_ctx->stats.sess_cb_hit++;
531 * Increment reference count now if the session callback asks us
532 * to do so (note that if the session structures returned by the
533 * callback are shared between threads, it must handle the
534 * reference count itself [i.e. copy == 0], or things won't be
538 SSL_SESSION_up_ref(ret);
541 * Add the externally cached session to the internal cache as
542 * well if and only if we are supposed to.
545 (s->session_ctx->session_cache_mode &
546 SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
548 * Either return value of SSL_CTX_add_session should not
549 * interrupt the session resumption process. The return
550 * value is intentionally ignored.
552 #pragma GCC diagnostic push
553 #pragma GCC diagnostic ignored "-Wunused-result"
554 SSL_CTX_add_session(s->session_ctx, ret);
555 #pragma GCC diagnostic pop
563 /* Now ret is non-NULL and we own one of its reference counts. */
565 /* Check TLS version consistency */
566 if (ret->ssl_version != s->version)
569 if (ret->sid_ctx_length != s->sid_ctx_length
570 || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
572 * We have the session requested by the client, but we don't want to
573 * use it in this context.
575 goto err; /* treat like cache miss */
578 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
580 * We can't be sure if this session is being used out of context,
581 * which is especially important for SSL_VERIFY_PEER. The application
582 * should have used SSL[_CTX]_set_session_id_context. For this error
583 * case, we generate an error instead of treating the event like a
584 * cache miss (otherwise it would be easy for applications to
585 * effectively disable the session cache by accident without anyone
589 SSLerr(SSL_F_SSL_GET_PREV_SESSION,
590 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
595 if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */
596 s->session_ctx->stats.sess_timeout++;
597 if (try_session_cache) {
598 /* session was from the cache, so remove it */
599 SSL_CTX_remove_session(s->session_ctx, ret);
604 /* Check extended master secret extension consistency */
605 if (ret->flags & SSL_SESS_FLAG_EXTMS) {
606 /* If old session includes extms, but new does not: abort handshake */
607 if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS)) {
608 SSLerr(SSL_F_SSL_GET_PREV_SESSION, SSL_R_INCONSISTENT_EXTMS);
609 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
613 } else if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) {
614 /* If new session includes extms, but old does not: do not resume */
618 if (!SSL_IS_TLS13(s)) {
619 /* We already did this for TLS1.3 */
620 SSL_SESSION_free(s->session);
624 s->session_ctx->stats.sess_hit++;
625 s->verify_result = s->session->verify_result;
630 SSL_SESSION_free(ret);
631 /* In TLSv1.3 s->session was already set to ret, so we NULL it out */
635 if (!try_session_cache) {
637 * The session was from a ticket, so we should issue a ticket for
640 s->ext.ticket_expected = 1;
644 *al = SSL_AD_INTERNAL_ERROR;
651 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
657 * add just 1 reference count for the SSL_CTX's session cache even though
658 * it has two ways of access: each session is in a doubly linked list and
661 SSL_SESSION_up_ref(c);
663 * if session c is in already in cache, we take back the increment later
666 CRYPTO_THREAD_write_lock(ctx->lock);
667 s = lh_SSL_SESSION_insert(ctx->sessions, c);
670 * s != NULL iff we already had a session with the given PID. In this
671 * case, s == c should hold (then we did not really modify
672 * ctx->sessions), or we're in trouble.
674 if (s != NULL && s != c) {
675 /* We *are* in trouble ... */
676 SSL_SESSION_list_remove(ctx, s);
679 * ... so pretend the other session did not exist in cache (we cannot
680 * handle two SSL_SESSION structures with identical session ID in the
681 * same cache, which could happen e.g. when two threads concurrently
682 * obtain the same session from an external cache)
685 } else if (s == NULL &&
686 lh_SSL_SESSION_retrieve(ctx->sessions, c) == NULL) {
687 /* s == NULL can also mean OOM error in lh_SSL_SESSION_insert ... */
690 * ... so take back the extra reference and also don't add
691 * the session to the SSL_SESSION_list at this time
696 /* Put at the head of the queue unless it is already in the cache */
698 SSL_SESSION_list_add(ctx, c);
702 * existing cache entry -- decrement previously incremented reference
703 * count because it already takes into account the cache
706 SSL_SESSION_free(s); /* s == c */
710 * new cache entry -- remove old ones if cache has become too large
715 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
716 while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
717 if (!remove_session_lock(ctx, ctx->session_cache_tail, 0))
720 ctx->stats.sess_cache_full++;
724 CRYPTO_THREAD_unlock(ctx->lock);
728 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
730 return remove_session_lock(ctx, c, 1);
733 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
738 if ((c != NULL) && (c->session_id_length != 0)) {
740 CRYPTO_THREAD_write_lock(ctx->lock);
741 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
743 r = lh_SSL_SESSION_delete(ctx->sessions, c);
744 SSL_SESSION_list_remove(ctx, c);
746 c->not_resumable = 1;
749 CRYPTO_THREAD_unlock(ctx->lock);
754 if (ctx->remove_session_cb != NULL)
755 ctx->remove_session_cb(ctx, c);
761 void SSL_SESSION_free(SSL_SESSION *ss)
768 CRYPTO_DOWN_REF(&ss->references, &i, ss->lock);
769 REF_PRINT_COUNT("SSL_SESSION", ss);
772 REF_ASSERT_ISNT(i < 0);
774 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
776 OPENSSL_cleanse(ss->master_key, sizeof ss->master_key);
777 OPENSSL_cleanse(ss->session_id, sizeof ss->session_id);
779 sk_X509_pop_free(ss->peer_chain, X509_free);
780 sk_SSL_CIPHER_free(ss->ciphers);
781 OPENSSL_free(ss->ext.hostname);
782 OPENSSL_free(ss->ext.tick);
783 #ifndef OPENSSL_NO_EC
784 OPENSSL_free(ss->ext.ecpointformats);
785 ss->ext.ecpointformats = NULL;
786 ss->ext.ecpointformats_len = 0;
787 OPENSSL_free(ss->ext.supportedgroups);
788 ss->ext.supportedgroups = NULL;
789 ss->ext.supportedgroups_len = 0;
790 #endif /* OPENSSL_NO_EC */
791 #ifndef OPENSSL_NO_PSK
792 OPENSSL_free(ss->psk_identity_hint);
793 OPENSSL_free(ss->psk_identity);
795 #ifndef OPENSSL_NO_SRP
796 OPENSSL_free(ss->srp_username);
798 OPENSSL_free(ss->ext.alpn_selected);
799 OPENSSL_free(ss->ext.tick_nonce);
800 CRYPTO_THREAD_lock_free(ss->lock);
801 OPENSSL_clear_free(ss, sizeof(*ss));
804 int SSL_SESSION_up_ref(SSL_SESSION *ss)
808 if (CRYPTO_UP_REF(&ss->references, &i, ss->lock) <= 0)
811 REF_PRINT_COUNT("SSL_SESSION", ss);
812 REF_ASSERT_ISNT(i < 2);
813 return ((i > 1) ? 1 : 0);
816 int SSL_set_session(SSL *s, SSL_SESSION *session)
818 ssl_clear_bad_session(s);
819 if (s->ctx->method != s->method) {
820 if (!SSL_set_ssl_method(s, s->ctx->method))
824 if (session != NULL) {
825 SSL_SESSION_up_ref(session);
826 s->verify_result = session->verify_result;
828 SSL_SESSION_free(s->session);
829 s->session = session;
834 int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
835 unsigned int sid_len)
837 if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
838 SSLerr(SSL_F_SSL_SESSION_SET1_ID,
839 SSL_R_SSL_SESSION_ID_TOO_LONG);
842 s->session_id_length = sid_len;
843 if (sid != s->session_id)
844 memcpy(s->session_id, sid, sid_len);
848 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
856 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
863 long SSL_SESSION_get_time(const SSL_SESSION *s)
870 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
878 int SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
880 return s->ssl_version;
883 int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version)
885 s->ssl_version = version;
889 const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s)
894 int SSL_SESSION_set_cipher(SSL_SESSION *s, const SSL_CIPHER *cipher)
900 const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s)
902 return s->ext.hostname;
905 int SSL_SESSION_has_ticket(const SSL_SESSION *s)
907 return (s->ext.ticklen > 0) ? 1 : 0;
910 unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
912 return s->ext.tick_lifetime_hint;
915 void SSL_SESSION_get0_ticket(const SSL_SESSION *s, const unsigned char **tick,
918 *len = s->ext.ticklen;
923 uint32_t SSL_SESSION_get_max_early_data(const SSL_SESSION *s)
925 return s->ext.max_early_data;
928 X509 *SSL_SESSION_get0_peer(SSL_SESSION *s)
933 int SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
934 unsigned int sid_ctx_len)
936 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
937 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,
938 SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
941 s->sid_ctx_length = sid_ctx_len;
942 if (sid_ctx != s->sid_ctx)
943 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
948 int SSL_SESSION_is_resumable(const SSL_SESSION *s)
951 * In the case of EAP-FAST, we can have a pre-shared "ticket" without a
954 return !s->not_resumable
955 && (s->session_id_length > 0 || s->ext.ticklen > 0);
958 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
963 l = s->session_timeout;
964 s->session_timeout = t;
968 long SSL_CTX_get_timeout(const SSL_CTX *s)
972 return (s->session_timeout);
975 int SSL_set_session_secret_cb(SSL *s,
976 tls_session_secret_cb_fn tls_session_secret_cb,
981 s->ext.session_secret_cb = tls_session_secret_cb;
982 s->ext.session_secret_cb_arg = arg;
986 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
991 s->ext.session_ticket_cb = cb;
992 s->ext.session_ticket_cb_arg = arg;
996 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
998 if (s->version >= TLS1_VERSION) {
999 OPENSSL_free(s->ext.session_ticket);
1000 s->ext.session_ticket = NULL;
1001 s->ext.session_ticket =
1002 OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
1003 if (s->ext.session_ticket == NULL) {
1004 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE);
1008 if (ext_data != NULL) {
1009 s->ext.session_ticket->length = ext_len;
1010 s->ext.session_ticket->data = s->ext.session_ticket + 1;
1011 memcpy(s->ext.session_ticket->data, ext_data, ext_len);
1013 s->ext.session_ticket->length = 0;
1014 s->ext.session_ticket->data = NULL;
1023 typedef struct timeout_param_st {
1026 LHASH_OF(SSL_SESSION) *cache;
1029 static void timeout_cb(SSL_SESSION *s, TIMEOUT_PARAM *p)
1031 if ((p->time == 0) || (p->time > (s->time + s->timeout))) { /* timeout */
1033 * The reason we don't call SSL_CTX_remove_session() is to save on
1036 (void)lh_SSL_SESSION_delete(p->cache, s);
1037 SSL_SESSION_list_remove(p->ctx, s);
1038 s->not_resumable = 1;
1039 if (p->ctx->remove_session_cb != NULL)
1040 p->ctx->remove_session_cb(p->ctx, s);
1041 SSL_SESSION_free(s);
1045 IMPLEMENT_LHASH_DOALL_ARG(SSL_SESSION, TIMEOUT_PARAM);
1047 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
1053 tp.cache = s->sessions;
1054 if (tp.cache == NULL)
1057 CRYPTO_THREAD_write_lock(s->lock);
1058 i = lh_SSL_SESSION_get_down_load(s->sessions);
1059 lh_SSL_SESSION_set_down_load(s->sessions, 0);
1060 lh_SSL_SESSION_doall_TIMEOUT_PARAM(tp.cache, timeout_cb, &tp);
1061 lh_SSL_SESSION_set_down_load(s->sessions, i);
1062 CRYPTO_THREAD_unlock(s->lock);
1065 int ssl_clear_bad_session(SSL *s)
1067 if ((s->session != NULL) &&
1068 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
1069 !(SSL_in_init(s) || SSL_in_before(s))) {
1070 SSL_CTX_remove_session(s->session_ctx, s->session);
1076 /* locked by SSL_CTX in the calling function */
1077 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
1079 if ((s->next == NULL) || (s->prev == NULL))
1082 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
1083 /* last element in list */
1084 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1085 /* only one element in list */
1086 ctx->session_cache_head = NULL;
1087 ctx->session_cache_tail = NULL;
1089 ctx->session_cache_tail = s->prev;
1090 s->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail);
1093 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1094 /* first element in list */
1095 ctx->session_cache_head = s->next;
1096 s->next->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1098 /* middle of list */
1099 s->next->prev = s->prev;
1100 s->prev->next = s->next;
1103 s->prev = s->next = NULL;
1106 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
1108 if ((s->next != NULL) && (s->prev != NULL))
1109 SSL_SESSION_list_remove(ctx, s);
1111 if (ctx->session_cache_head == NULL) {
1112 ctx->session_cache_head = s;
1113 ctx->session_cache_tail = s;
1114 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1115 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
1117 s->next = ctx->session_cache_head;
1119 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1120 ctx->session_cache_head = s;
1124 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1125 int (*cb) (struct ssl_st *ssl, SSL_SESSION *sess))
1127 ctx->new_session_cb = cb;
1130 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (SSL *ssl, SSL_SESSION *sess) {
1131 return ctx->new_session_cb;
1134 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1135 void (*cb) (SSL_CTX *ctx, SSL_SESSION *sess))
1137 ctx->remove_session_cb = cb;
1140 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (SSL_CTX *ctx,
1141 SSL_SESSION *sess) {
1142 return ctx->remove_session_cb;
1145 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
1146 SSL_SESSION *(*cb) (struct ssl_st *ssl,
1147 const unsigned char *data,
1148 int len, int *copy))
1150 ctx->get_session_cb = cb;
1153 SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (SSL *ssl,
1157 return ctx->get_session_cb;
1160 void SSL_CTX_set_info_callback(SSL_CTX *ctx,
1161 void (*cb) (const SSL *ssl, int type, int val))
1163 ctx->info_callback = cb;
1166 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type,
1168 return ctx->info_callback;
1171 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1172 int (*cb) (SSL *ssl, X509 **x509,
1175 ctx->client_cert_cb = cb;
1178 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509,
1180 return ctx->client_cert_cb;
1183 #ifndef OPENSSL_NO_ENGINE
1184 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1186 if (!ENGINE_init(e)) {
1187 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB);
1190 if (!ENGINE_get_ssl_client_cert_function(e)) {
1191 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
1192 SSL_R_NO_CLIENT_CERT_METHOD);
1196 ctx->client_cert_engine = e;
1201 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1202 int (*cb) (SSL *ssl,
1203 unsigned char *cookie,
1204 unsigned int *cookie_len))
1206 ctx->app_gen_cookie_cb = cb;
1209 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1210 int (*cb) (SSL *ssl,
1211 const unsigned char *cookie,
1212 unsigned int cookie_len))
1214 ctx->app_verify_cookie_cb = cb;
1217 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)