2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2005 Nokia. All rights reserved.
5 * Licensed under the Apache License 2.0 (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/rand.h>
13 #include <openssl/engine.h>
14 #include "internal/refcount.h"
15 #include "internal/cryptlib.h"
16 #include "ssl_local.h"
17 #include "statem/statem_local.h"
19 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
20 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
21 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
24 * SSL_get_session() and SSL_get1_session() are problematic in TLS1.3 because,
25 * unlike in earlier protocol versions, the session ticket may not have been
26 * sent yet even though a handshake has finished. The session ticket data could
27 * come in sometime later...or even change if multiple session ticket messages
28 * are sent from the server. The preferred way for applications to obtain
29 * a resumable session is to use SSL_CTX_sess_set_new_cb().
32 SSL_SESSION *SSL_get_session(const SSL *ssl)
33 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
38 SSL_SESSION *SSL_get1_session(SSL *ssl)
39 /* variant of SSL_get_session: caller really gets something */
43 * Need to lock this all up rather than just use CRYPTO_add so that
44 * somebody doesn't free ssl->session between when we check it's non-null
45 * and when we up the reference count.
47 CRYPTO_THREAD_read_lock(ssl->lock);
50 SSL_SESSION_up_ref(sess);
51 CRYPTO_THREAD_unlock(ssl->lock);
55 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
57 return CRYPTO_set_ex_data(&s->ex_data, idx, arg);
60 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
62 return CRYPTO_get_ex_data(&s->ex_data, idx);
65 SSL_SESSION *SSL_SESSION_new(void)
69 if (!OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL))
72 ss = OPENSSL_zalloc(sizeof(*ss));
74 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
78 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
80 ss->timeout = 60 * 5 + 4; /* 5 minute timeout by default */
81 ss->time = (unsigned long)time(NULL);
82 ss->lock = CRYPTO_THREAD_lock_new();
83 if (ss->lock == NULL) {
84 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
89 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data)) {
90 CRYPTO_THREAD_lock_free(ss->lock);
97 SSL_SESSION *SSL_SESSION_dup(const SSL_SESSION *src)
99 return ssl_session_dup(src, 1);
103 * Create a new SSL_SESSION and duplicate the contents of |src| into it. If
104 * ticket == 0 then no ticket information is duplicated, otherwise it is.
106 SSL_SESSION *ssl_session_dup(const SSL_SESSION *src, int ticket)
110 dest = OPENSSL_malloc(sizeof(*dest));
114 memcpy(dest, src, sizeof(*dest));
117 * Set the various pointers to NULL so that we can call SSL_SESSION_free in
118 * the case of an error whilst halfway through constructing dest
120 #ifndef OPENSSL_NO_PSK
121 dest->psk_identity_hint = NULL;
122 dest->psk_identity = NULL;
124 dest->ext.hostname = NULL;
125 dest->ext.tick = NULL;
126 dest->ext.alpn_selected = NULL;
127 #ifndef OPENSSL_NO_SRP
128 dest->srp_username = NULL;
130 dest->peer_chain = NULL;
132 dest->ticket_appdata = NULL;
133 memset(&dest->ex_data, 0, sizeof(dest->ex_data));
135 /* We deliberately don't copy the prev and next pointers */
139 dest->references = 1;
141 dest->lock = CRYPTO_THREAD_lock_new();
142 if (dest->lock == NULL)
145 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, dest, &dest->ex_data))
148 if (src->peer != NULL) {
149 if (!X509_up_ref(src->peer))
151 dest->peer = src->peer;
154 if (src->peer_chain != NULL) {
155 dest->peer_chain = X509_chain_up_ref(src->peer_chain);
156 if (dest->peer_chain == NULL)
159 #ifndef OPENSSL_NO_PSK
160 if (src->psk_identity_hint) {
161 dest->psk_identity_hint = OPENSSL_strdup(src->psk_identity_hint);
162 if (dest->psk_identity_hint == NULL) {
166 if (src->psk_identity) {
167 dest->psk_identity = OPENSSL_strdup(src->psk_identity);
168 if (dest->psk_identity == NULL) {
174 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION,
175 &dest->ex_data, &src->ex_data)) {
179 if (src->ext.hostname) {
180 dest->ext.hostname = OPENSSL_strdup(src->ext.hostname);
181 if (dest->ext.hostname == NULL) {
186 if (ticket != 0 && src->ext.tick != NULL) {
188 OPENSSL_memdup(src->ext.tick, src->ext.ticklen);
189 if (dest->ext.tick == NULL)
192 dest->ext.tick_lifetime_hint = 0;
193 dest->ext.ticklen = 0;
196 if (src->ext.alpn_selected != NULL) {
197 dest->ext.alpn_selected = OPENSSL_memdup(src->ext.alpn_selected,
198 src->ext.alpn_selected_len);
199 if (dest->ext.alpn_selected == NULL)
203 #ifndef OPENSSL_NO_SRP
204 if (src->srp_username) {
205 dest->srp_username = OPENSSL_strdup(src->srp_username);
206 if (dest->srp_username == NULL) {
212 if (src->ticket_appdata != NULL) {
213 dest->ticket_appdata =
214 OPENSSL_memdup(src->ticket_appdata, src->ticket_appdata_len);
215 if (dest->ticket_appdata == NULL)
221 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
222 SSL_SESSION_free(dest);
226 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
229 *len = (unsigned int)s->session_id_length;
230 return s->session_id;
232 const unsigned char *SSL_SESSION_get0_id_context(const SSL_SESSION *s,
236 *len = (unsigned int)s->sid_ctx_length;
240 unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s)
242 return s->compress_meth;
246 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
247 * the ID with random junk repeatedly until we have no conflict is going to
248 * complete in one iteration pretty much "most" of the time (btw:
249 * understatement). So, if it takes us 10 iterations and we still can't avoid
250 * a conflict - well that's a reasonable point to call it quits. Either the
251 * RAND code is broken or someone is trying to open roughly very close to
252 * 2^256 SSL sessions to our server. How you might store that many sessions
253 * is perhaps a more interesting question ...
256 #define MAX_SESS_ID_ATTEMPTS 10
257 static int def_generate_session_id(SSL *ssl, unsigned char *id,
258 unsigned int *id_len)
260 unsigned int retry = 0;
262 if (RAND_bytes_ex(ssl->ctx->libctx, id, *id_len) <= 0)
264 while (SSL_has_matching_session_id(ssl, id, *id_len) &&
265 (++retry < MAX_SESS_ID_ATTEMPTS)) ;
266 if (retry < MAX_SESS_ID_ATTEMPTS)
268 /* else - woops a session_id match */
270 * XXX We should also check the external cache -- but the probability of
271 * a collision is negligible, and we could not prevent the concurrent
272 * creation of sessions with identical IDs since we currently don't have
273 * means to atomically check whether a session ID already exists and make
274 * a reservation for it if it does not (this problem applies to the
275 * internal cache as well).
280 int ssl_generate_session_id(SSL *s, SSL_SESSION *ss)
283 GEN_SESSION_CB cb = def_generate_session_id;
285 switch (s->version) {
293 case DTLS1_2_VERSION:
294 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
297 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_UNSUPPORTED_SSL_VERSION);
302 * If RFC5077 ticket, use empty session ID (as server).
304 * (a) ssl_get_prev_session() does lookahead into the
305 * ClientHello extensions to find the session ticket.
306 * When ssl_get_prev_session() fails, statem_srvr.c calls
307 * ssl_get_new_session() in tls_process_client_hello().
308 * At that point, it has not yet parsed the extensions,
309 * however, because of the lookahead, it already knows
310 * whether a ticket is expected or not.
312 * (b) statem_clnt.c calls ssl_get_new_session() before parsing
313 * ServerHello extensions, and before recording the session
314 * ID received from the server, so this block is a noop.
316 if (s->ext.ticket_expected) {
317 ss->session_id_length = 0;
321 /* Choose which callback will set the session ID */
322 CRYPTO_THREAD_read_lock(s->lock);
323 CRYPTO_THREAD_read_lock(s->session_ctx->lock);
324 if (s->generate_session_id)
325 cb = s->generate_session_id;
326 else if (s->session_ctx->generate_session_id)
327 cb = s->session_ctx->generate_session_id;
328 CRYPTO_THREAD_unlock(s->session_ctx->lock);
329 CRYPTO_THREAD_unlock(s->lock);
330 /* Choose a session ID */
331 memset(ss->session_id, 0, ss->session_id_length);
332 tmp = (int)ss->session_id_length;
333 if (!cb(s, ss->session_id, &tmp)) {
334 /* The callback failed */
335 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
336 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
340 * Don't allow the callback to set the session length to zero. nor
341 * set it higher than it was.
343 if (tmp == 0 || tmp > ss->session_id_length) {
344 /* The callback set an illegal length */
345 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
346 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
349 ss->session_id_length = tmp;
350 /* Finally, check for a conflict */
351 if (SSL_has_matching_session_id(s, ss->session_id,
352 (unsigned int)ss->session_id_length)) {
353 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_SSL_SESSION_ID_CONFLICT);
360 int ssl_get_new_session(SSL *s, int session)
362 /* This gets used by clients and servers. */
364 SSL_SESSION *ss = NULL;
366 if ((ss = SSL_SESSION_new()) == NULL) {
367 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
371 /* If the context has a default timeout, use it */
372 if (s->session_ctx->session_timeout == 0)
373 ss->timeout = SSL_get_default_timeout(s);
375 ss->timeout = s->session_ctx->session_timeout;
377 SSL_SESSION_free(s->session);
381 if (SSL_IS_TLS13(s)) {
383 * We generate the session id while constructing the
384 * NewSessionTicket in TLSv1.3.
386 ss->session_id_length = 0;
387 } else if (!ssl_generate_session_id(s, ss)) {
388 /* SSLfatal() already called */
389 SSL_SESSION_free(ss);
394 ss->session_id_length = 0;
397 if (s->sid_ctx_length > sizeof(ss->sid_ctx)) {
398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
399 SSL_SESSION_free(ss);
402 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
403 ss->sid_ctx_length = s->sid_ctx_length;
405 ss->ssl_version = s->version;
406 ss->verify_result = X509_V_OK;
408 /* If client supports extended master secret set it in session */
409 if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)
410 ss->flags |= SSL_SESS_FLAG_EXTMS;
415 SSL_SESSION *lookup_sess_in_cache(SSL *s, const unsigned char *sess_id,
418 SSL_SESSION *ret = NULL;
420 if ((s->session_ctx->session_cache_mode
421 & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP) == 0) {
424 data.ssl_version = s->version;
425 if (!ossl_assert(sess_id_len <= SSL_MAX_SSL_SESSION_ID_LENGTH))
428 memcpy(data.session_id, sess_id, sess_id_len);
429 data.session_id_length = sess_id_len;
431 CRYPTO_THREAD_read_lock(s->session_ctx->lock);
432 ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
434 /* don't allow other threads to steal it: */
435 SSL_SESSION_up_ref(ret);
437 CRYPTO_THREAD_unlock(s->session_ctx->lock);
439 tsan_counter(&s->session_ctx->stats.sess_miss);
442 if (ret == NULL && s->session_ctx->get_session_cb != NULL) {
445 ret = s->session_ctx->get_session_cb(s, sess_id, sess_id_len, ©);
448 tsan_counter(&s->session_ctx->stats.sess_cb_hit);
451 * Increment reference count now if the session callback asks us
452 * to do so (note that if the session structures returned by the
453 * callback are shared between threads, it must handle the
454 * reference count itself [i.e. copy == 0], or things won't be
458 SSL_SESSION_up_ref(ret);
461 * Add the externally cached session to the internal cache as
462 * well if and only if we are supposed to.
464 if ((s->session_ctx->session_cache_mode &
465 SSL_SESS_CACHE_NO_INTERNAL_STORE) == 0) {
467 * Either return value of SSL_CTX_add_session should not
468 * interrupt the session resumption process. The return
469 * value is intentionally ignored.
471 (void)SSL_CTX_add_session(s->session_ctx, ret);
480 * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
481 * connection. It is only called by servers.
483 * hello: The parsed ClientHello data
487 * 0: no session found
488 * 1: a session may have been found.
491 * - If a session is found then s->session is pointed at it (after freeing an
492 * existing session if need be) and s->verify_result is set from the session.
493 * - Both for new and resumed sessions, s->ext.ticket_expected is set to 1
494 * if the server should issue a new session ticket (to 0 otherwise).
496 int ssl_get_prev_session(SSL *s, CLIENTHELLO_MSG *hello)
498 /* This is used only by servers. */
500 SSL_SESSION *ret = NULL;
502 int try_session_cache = 0;
505 if (SSL_IS_TLS13(s)) {
507 * By default we will send a new ticket. This can be overridden in the
510 s->ext.ticket_expected = 1;
511 if (!tls_parse_extension(s, TLSEXT_IDX_psk_kex_modes,
512 SSL_EXT_CLIENT_HELLO, hello->pre_proc_exts,
514 || !tls_parse_extension(s, TLSEXT_IDX_psk, SSL_EXT_CLIENT_HELLO,
515 hello->pre_proc_exts, NULL, 0))
520 /* sets s->ext.ticket_expected */
521 r = tls_get_ticket_from_client(s, hello, &ret);
523 case SSL_TICKET_FATAL_ERR_MALLOC:
524 case SSL_TICKET_FATAL_ERR_OTHER:
526 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
528 case SSL_TICKET_NONE:
529 case SSL_TICKET_EMPTY:
530 if (hello->session_id_len > 0) {
531 try_session_cache = 1;
532 ret = lookup_sess_in_cache(s, hello->session_id,
533 hello->session_id_len);
536 case SSL_TICKET_NO_DECRYPT:
537 case SSL_TICKET_SUCCESS:
538 case SSL_TICKET_SUCCESS_RENEW:
546 /* Now ret is non-NULL and we own one of its reference counts. */
548 /* Check TLS version consistency */
549 if (ret->ssl_version != s->version)
552 if (ret->sid_ctx_length != s->sid_ctx_length
553 || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
555 * We have the session requested by the client, but we don't want to
556 * use it in this context.
558 goto err; /* treat like cache miss */
561 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
563 * We can't be sure if this session is being used out of context,
564 * which is especially important for SSL_VERIFY_PEER. The application
565 * should have used SSL[_CTX]_set_session_id_context. For this error
566 * case, we generate an error instead of treating the event like a
567 * cache miss (otherwise it would be easy for applications to
568 * effectively disable the session cache by accident without anyone
572 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
573 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
578 if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */
579 tsan_counter(&s->session_ctx->stats.sess_timeout);
580 if (try_session_cache) {
581 /* session was from the cache, so remove it */
582 SSL_CTX_remove_session(s->session_ctx, ret);
587 /* Check extended master secret extension consistency */
588 if (ret->flags & SSL_SESS_FLAG_EXTMS) {
589 /* If old session includes extms, but new does not: abort handshake */
590 if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)) {
591 SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_INCONSISTENT_EXTMS);
595 } else if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) {
596 /* If new session includes extms, but old does not: do not resume */
600 if (!SSL_IS_TLS13(s)) {
601 /* We already did this for TLS1.3 */
602 SSL_SESSION_free(s->session);
606 tsan_counter(&s->session_ctx->stats.sess_hit);
607 s->verify_result = s->session->verify_result;
612 SSL_SESSION_free(ret);
613 /* In TLSv1.3 s->session was already set to ret, so we NULL it out */
617 if (!try_session_cache) {
619 * The session was from a ticket, so we should issue a ticket for
622 s->ext.ticket_expected = 1;
631 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
637 * add just 1 reference count for the SSL_CTX's session cache even though
638 * it has two ways of access: each session is in a doubly linked list and
641 SSL_SESSION_up_ref(c);
643 * if session c is in already in cache, we take back the increment later
646 CRYPTO_THREAD_write_lock(ctx->lock);
647 s = lh_SSL_SESSION_insert(ctx->sessions, c);
650 * s != NULL iff we already had a session with the given PID. In this
651 * case, s == c should hold (then we did not really modify
652 * ctx->sessions), or we're in trouble.
654 if (s != NULL && s != c) {
655 /* We *are* in trouble ... */
656 SSL_SESSION_list_remove(ctx, s);
659 * ... so pretend the other session did not exist in cache (we cannot
660 * handle two SSL_SESSION structures with identical session ID in the
661 * same cache, which could happen e.g. when two threads concurrently
662 * obtain the same session from an external cache)
665 } else if (s == NULL &&
666 lh_SSL_SESSION_retrieve(ctx->sessions, c) == NULL) {
667 /* s == NULL can also mean OOM error in lh_SSL_SESSION_insert ... */
670 * ... so take back the extra reference and also don't add
671 * the session to the SSL_SESSION_list at this time
676 /* Put at the head of the queue unless it is already in the cache */
678 SSL_SESSION_list_add(ctx, c);
682 * existing cache entry -- decrement previously incremented reference
683 * count because it already takes into account the cache
686 SSL_SESSION_free(s); /* s == c */
690 * new cache entry -- remove old ones if cache has become too large
695 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
696 while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
697 if (!remove_session_lock(ctx, ctx->session_cache_tail, 0))
700 tsan_counter(&ctx->stats.sess_cache_full);
704 CRYPTO_THREAD_unlock(ctx->lock);
708 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
710 return remove_session_lock(ctx, c, 1);
713 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
718 if ((c != NULL) && (c->session_id_length != 0)) {
720 CRYPTO_THREAD_write_lock(ctx->lock);
721 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) != NULL) {
723 r = lh_SSL_SESSION_delete(ctx->sessions, r);
724 SSL_SESSION_list_remove(ctx, r);
726 c->not_resumable = 1;
729 CRYPTO_THREAD_unlock(ctx->lock);
731 if (ctx->remove_session_cb != NULL)
732 ctx->remove_session_cb(ctx, c);
741 void SSL_SESSION_free(SSL_SESSION *ss)
747 CRYPTO_DOWN_REF(&ss->references, &i, ss->lock);
748 REF_PRINT_COUNT("SSL_SESSION", ss);
751 REF_ASSERT_ISNT(i < 0);
753 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
755 OPENSSL_cleanse(ss->master_key, sizeof(ss->master_key));
756 OPENSSL_cleanse(ss->session_id, sizeof(ss->session_id));
758 sk_X509_pop_free(ss->peer_chain, X509_free);
759 OPENSSL_free(ss->ext.hostname);
760 OPENSSL_free(ss->ext.tick);
761 #ifndef OPENSSL_NO_PSK
762 OPENSSL_free(ss->psk_identity_hint);
763 OPENSSL_free(ss->psk_identity);
765 #ifndef OPENSSL_NO_SRP
766 OPENSSL_free(ss->srp_username);
768 OPENSSL_free(ss->ext.alpn_selected);
769 OPENSSL_free(ss->ticket_appdata);
770 CRYPTO_THREAD_lock_free(ss->lock);
771 OPENSSL_clear_free(ss, sizeof(*ss));
774 int SSL_SESSION_up_ref(SSL_SESSION *ss)
778 if (CRYPTO_UP_REF(&ss->references, &i, ss->lock) <= 0)
781 REF_PRINT_COUNT("SSL_SESSION", ss);
782 REF_ASSERT_ISNT(i < 2);
783 return ((i > 1) ? 1 : 0);
786 int SSL_set_session(SSL *s, SSL_SESSION *session)
788 ssl_clear_bad_session(s);
789 if (s->ctx->method != s->method) {
790 if (!SSL_set_ssl_method(s, s->ctx->method))
794 if (session != NULL) {
795 SSL_SESSION_up_ref(session);
796 s->verify_result = session->verify_result;
798 SSL_SESSION_free(s->session);
799 s->session = session;
804 int SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
805 unsigned int sid_len)
807 if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
808 ERR_raise(ERR_LIB_SSL, SSL_R_SSL_SESSION_ID_TOO_LONG);
811 s->session_id_length = sid_len;
812 if (sid != s->session_id)
813 memcpy(s->session_id, sid, sid_len);
817 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
825 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
832 long SSL_SESSION_get_time(const SSL_SESSION *s)
839 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
847 int SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
849 return s->ssl_version;
852 int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version)
854 s->ssl_version = version;
858 const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s)
863 int SSL_SESSION_set_cipher(SSL_SESSION *s, const SSL_CIPHER *cipher)
869 const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s)
871 return s->ext.hostname;
874 int SSL_SESSION_set1_hostname(SSL_SESSION *s, const char *hostname)
876 OPENSSL_free(s->ext.hostname);
877 if (hostname == NULL) {
878 s->ext.hostname = NULL;
881 s->ext.hostname = OPENSSL_strdup(hostname);
883 return s->ext.hostname != NULL;
886 int SSL_SESSION_has_ticket(const SSL_SESSION *s)
888 return (s->ext.ticklen > 0) ? 1 : 0;
891 unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
893 return s->ext.tick_lifetime_hint;
896 void SSL_SESSION_get0_ticket(const SSL_SESSION *s, const unsigned char **tick,
899 *len = s->ext.ticklen;
904 uint32_t SSL_SESSION_get_max_early_data(const SSL_SESSION *s)
906 return s->ext.max_early_data;
909 int SSL_SESSION_set_max_early_data(SSL_SESSION *s, uint32_t max_early_data)
911 s->ext.max_early_data = max_early_data;
916 void SSL_SESSION_get0_alpn_selected(const SSL_SESSION *s,
917 const unsigned char **alpn,
920 *alpn = s->ext.alpn_selected;
921 *len = s->ext.alpn_selected_len;
924 int SSL_SESSION_set1_alpn_selected(SSL_SESSION *s, const unsigned char *alpn,
927 OPENSSL_free(s->ext.alpn_selected);
928 if (alpn == NULL || len == 0) {
929 s->ext.alpn_selected = NULL;
930 s->ext.alpn_selected_len = 0;
933 s->ext.alpn_selected = OPENSSL_memdup(alpn, len);
934 if (s->ext.alpn_selected == NULL) {
935 s->ext.alpn_selected_len = 0;
938 s->ext.alpn_selected_len = len;
943 X509 *SSL_SESSION_get0_peer(SSL_SESSION *s)
948 int SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
949 unsigned int sid_ctx_len)
951 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
952 ERR_raise(ERR_LIB_SSL, SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
955 s->sid_ctx_length = sid_ctx_len;
956 if (sid_ctx != s->sid_ctx)
957 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
962 int SSL_SESSION_is_resumable(const SSL_SESSION *s)
965 * In the case of EAP-FAST, we can have a pre-shared "ticket" without a
968 return !s->not_resumable
969 && (s->session_id_length > 0 || s->ext.ticklen > 0);
972 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
977 l = s->session_timeout;
978 s->session_timeout = t;
982 long SSL_CTX_get_timeout(const SSL_CTX *s)
986 return s->session_timeout;
989 int SSL_set_session_secret_cb(SSL *s,
990 tls_session_secret_cb_fn tls_session_secret_cb,
995 s->ext.session_secret_cb = tls_session_secret_cb;
996 s->ext.session_secret_cb_arg = arg;
1000 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
1005 s->ext.session_ticket_cb = cb;
1006 s->ext.session_ticket_cb_arg = arg;
1010 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
1012 if (s->version >= TLS1_VERSION) {
1013 OPENSSL_free(s->ext.session_ticket);
1014 s->ext.session_ticket = NULL;
1015 s->ext.session_ticket =
1016 OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
1017 if (s->ext.session_ticket == NULL) {
1018 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
1022 if (ext_data != NULL) {
1023 s->ext.session_ticket->length = ext_len;
1024 s->ext.session_ticket->data = s->ext.session_ticket + 1;
1025 memcpy(s->ext.session_ticket->data, ext_data, ext_len);
1027 s->ext.session_ticket->length = 0;
1028 s->ext.session_ticket->data = NULL;
1037 typedef struct timeout_param_st {
1040 LHASH_OF(SSL_SESSION) *cache;
1043 static void timeout_cb(SSL_SESSION *s, TIMEOUT_PARAM *p)
1045 if ((p->time == 0) || (p->time > (s->time + s->timeout))) { /* timeout */
1047 * The reason we don't call SSL_CTX_remove_session() is to save on
1050 (void)lh_SSL_SESSION_delete(p->cache, s);
1051 SSL_SESSION_list_remove(p->ctx, s);
1052 s->not_resumable = 1;
1053 if (p->ctx->remove_session_cb != NULL)
1054 p->ctx->remove_session_cb(p->ctx, s);
1055 SSL_SESSION_free(s);
1059 IMPLEMENT_LHASH_DOALL_ARG(SSL_SESSION, TIMEOUT_PARAM);
1061 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
1067 tp.cache = s->sessions;
1068 if (tp.cache == NULL)
1071 CRYPTO_THREAD_write_lock(s->lock);
1072 i = lh_SSL_SESSION_get_down_load(s->sessions);
1073 lh_SSL_SESSION_set_down_load(s->sessions, 0);
1074 lh_SSL_SESSION_doall_TIMEOUT_PARAM(tp.cache, timeout_cb, &tp);
1075 lh_SSL_SESSION_set_down_load(s->sessions, i);
1076 CRYPTO_THREAD_unlock(s->lock);
1079 int ssl_clear_bad_session(SSL *s)
1081 if ((s->session != NULL) &&
1082 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
1083 !(SSL_in_init(s) || SSL_in_before(s))) {
1084 SSL_CTX_remove_session(s->session_ctx, s->session);
1090 /* locked by SSL_CTX in the calling function */
1091 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
1093 if ((s->next == NULL) || (s->prev == NULL))
1096 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
1097 /* last element in list */
1098 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1099 /* only one element in list */
1100 ctx->session_cache_head = NULL;
1101 ctx->session_cache_tail = NULL;
1103 ctx->session_cache_tail = s->prev;
1104 s->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail);
1107 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1108 /* first element in list */
1109 ctx->session_cache_head = s->next;
1110 s->next->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1112 /* middle of list */
1113 s->next->prev = s->prev;
1114 s->prev->next = s->next;
1117 s->prev = s->next = NULL;
1120 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
1122 if ((s->next != NULL) && (s->prev != NULL))
1123 SSL_SESSION_list_remove(ctx, s);
1125 if (ctx->session_cache_head == NULL) {
1126 ctx->session_cache_head = s;
1127 ctx->session_cache_tail = s;
1128 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1129 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
1131 s->next = ctx->session_cache_head;
1133 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1134 ctx->session_cache_head = s;
1138 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1139 int (*cb) (struct ssl_st *ssl, SSL_SESSION *sess))
1141 ctx->new_session_cb = cb;
1144 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (SSL *ssl, SSL_SESSION *sess) {
1145 return ctx->new_session_cb;
1148 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1149 void (*cb) (SSL_CTX *ctx, SSL_SESSION *sess))
1151 ctx->remove_session_cb = cb;
1154 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (SSL_CTX *ctx,
1155 SSL_SESSION *sess) {
1156 return ctx->remove_session_cb;
1159 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
1160 SSL_SESSION *(*cb) (struct ssl_st *ssl,
1161 const unsigned char *data,
1162 int len, int *copy))
1164 ctx->get_session_cb = cb;
1167 SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (SSL *ssl,
1171 return ctx->get_session_cb;
1174 void SSL_CTX_set_info_callback(SSL_CTX *ctx,
1175 void (*cb) (const SSL *ssl, int type, int val))
1177 ctx->info_callback = cb;
1180 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type,
1182 return ctx->info_callback;
1185 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1186 int (*cb) (SSL *ssl, X509 **x509,
1189 ctx->client_cert_cb = cb;
1192 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509,
1194 return ctx->client_cert_cb;
1197 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1198 int (*cb) (SSL *ssl,
1199 unsigned char *cookie,
1200 unsigned int *cookie_len))
1202 ctx->app_gen_cookie_cb = cb;
1205 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1206 int (*cb) (SSL *ssl,
1207 const unsigned char *cookie,
1208 unsigned int cookie_len))
1210 ctx->app_verify_cookie_cb = cb;
1213 int SSL_SESSION_set1_ticket_appdata(SSL_SESSION *ss, const void *data, size_t len)
1215 OPENSSL_free(ss->ticket_appdata);
1216 ss->ticket_appdata_len = 0;
1217 if (data == NULL || len == 0) {
1218 ss->ticket_appdata = NULL;
1221 ss->ticket_appdata = OPENSSL_memdup(data, len);
1222 if (ss->ticket_appdata != NULL) {
1223 ss->ticket_appdata_len = len;
1229 int SSL_SESSION_get0_ticket_appdata(SSL_SESSION *ss, void **data, size_t *len)
1231 *data = ss->ticket_appdata;
1232 *len = ss->ticket_appdata_len;
1236 void SSL_CTX_set_stateless_cookie_generate_cb(
1238 int (*cb) (SSL *ssl,
1239 unsigned char *cookie,
1240 size_t *cookie_len))
1242 ctx->gen_stateless_cookie_cb = cb;
1245 void SSL_CTX_set_stateless_cookie_verify_cb(
1247 int (*cb) (SSL *ssl,
1248 const unsigned char *cookie,
1251 ctx->verify_stateless_cookie_cb = cb;
1254 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)