2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
60 #include <openssl/lhash.h>
61 #include <openssl/rand.h>
62 #ifndef OPENSSL_NO_ENGINE
63 # include <openssl/engine.h>
67 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
68 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
69 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
71 SSL_SESSION *SSL_get_session(const SSL *ssl)
72 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
74 return (ssl->session);
77 SSL_SESSION *SSL_get1_session(SSL *ssl)
78 /* variant of SSL_get_session: caller really gets something */
82 * Need to lock this all up rather than just use CRYPTO_add so that
83 * somebody doesn't free ssl->session between when we check it's non-null
84 * and when we up the reference count.
86 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
90 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
94 int SSL_SESSION_get_ex_new_index(long argl, void *argp,
95 CRYPTO_EX_new *new_func,
96 CRYPTO_EX_dup *dup_func,
97 CRYPTO_EX_free *free_func)
99 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
100 new_func, dup_func, free_func);
103 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
105 return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
108 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
110 return (CRYPTO_get_ex_data(&s->ex_data, idx));
113 SSL_SESSION *SSL_SESSION_new(void)
117 ss = (SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
119 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE);
122 memset(ss, 0, sizeof(SSL_SESSION));
124 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
126 ss->timeout = 60 * 5 + 4; /* 5 minute timeout by default */
127 ss->time = (unsigned long)time(NULL);
130 ss->compress_meth = 0;
131 #ifndef OPENSSL_NO_TLSEXT
132 ss->tlsext_hostname = NULL;
134 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
138 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s,
142 *len = s->session_id_length;
143 return s->session_id;
147 * Even with SSLv2, we have 16 bytes (128 bits) of session ID space.
148 * SSLv3/TLSv1 has 32 bytes (256 bits). As such, filling the ID with random
149 * gunk repeatedly until we have no conflict is going to complete in one
150 * iteration pretty much "most" of the time (btw: understatement). So, if it
151 * takes us 10 iterations and we still can't avoid a conflict - well that's a
152 * reasonable point to call it quits. Either the RAND code is broken or
153 * someone is trying to open roughly very close to 2^128 (or 2^256) SSL
154 * sessions to our server. How you might store that many sessions is perhaps
155 * a more interesting question ...
158 #define MAX_SESS_ID_ATTEMPTS 10
159 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
160 unsigned int *id_len)
162 unsigned int retry = 0;
164 if (RAND_pseudo_bytes(id, *id_len) <= 0)
166 while (SSL_has_matching_session_id(ssl, id, *id_len) &&
167 (++retry < MAX_SESS_ID_ATTEMPTS)) ;
168 if (retry < MAX_SESS_ID_ATTEMPTS)
170 /* else - woops a session_id match */
172 * XXX We should also check the external cache -- but the probability of
173 * a collision is negligible, and we could not prevent the concurrent
174 * creation of sessions with identical IDs since we currently don't have
175 * means to atomically check whether a session ID already exists and make
176 * a reservation for it if it does not (this problem applies to the
177 * internal cache as well).
182 int ssl_get_new_session(SSL *s, int session)
184 /* This gets used by clients and servers. */
187 SSL_SESSION *ss = NULL;
188 GEN_SESSION_CB cb = def_generate_session_id;
190 if ((ss = SSL_SESSION_new()) == NULL)
193 /* If the context has a default timeout, use it */
194 if (s->ctx->session_timeout == 0)
195 ss->timeout = SSL_get_default_timeout(s);
197 ss->timeout = s->ctx->session_timeout;
199 if (s->session != NULL) {
200 SSL_SESSION_free(s->session);
205 if (s->version == SSL2_VERSION) {
206 ss->ssl_version = SSL2_VERSION;
207 ss->session_id_length = SSL2_SSL_SESSION_ID_LENGTH;
208 } else if (s->version == SSL3_VERSION) {
209 ss->ssl_version = SSL3_VERSION;
210 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
211 } else if (s->version == TLS1_VERSION) {
212 ss->ssl_version = TLS1_VERSION;
213 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
214 } else if (s->version == DTLS1_BAD_VER) {
215 ss->ssl_version = DTLS1_BAD_VER;
216 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
217 } else if (s->version == DTLS1_VERSION) {
218 ss->ssl_version = DTLS1_VERSION;
219 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
221 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION);
222 SSL_SESSION_free(ss);
225 #ifndef OPENSSL_NO_TLSEXT
226 /* If RFC4507 ticket use empty session ID */
227 if (s->tlsext_ticket_expected) {
228 ss->session_id_length = 0;
232 /* Choose which callback will set the session ID */
233 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
234 if (s->generate_session_id)
235 cb = s->generate_session_id;
236 else if (s->ctx->generate_session_id)
237 cb = s->ctx->generate_session_id;
238 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
239 /* Choose a session ID */
240 tmp = ss->session_id_length;
241 if (!cb(s, ss->session_id, &tmp)) {
242 /* The callback failed */
243 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
244 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
245 SSL_SESSION_free(ss);
249 * Don't allow the callback to set the session length to zero. nor
250 * set it higher than it was.
252 if (!tmp || (tmp > ss->session_id_length)) {
253 /* The callback set an illegal length */
254 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
255 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
256 SSL_SESSION_free(ss);
259 /* If the session length was shrunk and we're SSLv2, pad it */
260 if ((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
261 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
263 ss->session_id_length = tmp;
264 /* Finally, check for a conflict */
265 if (SSL_has_matching_session_id(s, ss->session_id,
266 ss->session_id_length)) {
267 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_SSL_SESSION_ID_CONFLICT);
268 SSL_SESSION_free(ss);
271 #ifndef OPENSSL_NO_TLSEXT
273 if (s->tlsext_hostname) {
274 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
275 if (ss->tlsext_hostname == NULL) {
276 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
277 SSL_SESSION_free(ss);
283 ss->session_id_length = 0;
286 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
287 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
288 SSL_SESSION_free(ss);
291 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
292 ss->sid_ctx_length = s->sid_ctx_length;
294 ss->ssl_version = s->version;
295 ss->verify_result = X509_V_OK;
300 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
301 const unsigned char *limit)
303 /* This is used only by servers. */
305 SSL_SESSION *ret = NULL;
307 #ifndef OPENSSL_NO_TLSEXT
311 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
313 #ifndef OPENSSL_NO_TLSEXT
314 r = tls1_process_ticket(s, session_id, len, limit, &ret);
318 } else if (r == 0 || (!ret && !len))
322 session_ctx->session_cache_mode &
323 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
327 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
331 data.ssl_version = s->version;
332 data.session_id_length = len;
335 memcpy(data.session_id, session_id, len);
336 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
337 ret = (SSL_SESSION *)lh_retrieve(s->ctx->sessions, &data);
339 /* don't allow other threads to steal it: */
340 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION);
341 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
347 s->ctx->stats.sess_miss++;
349 if (s->ctx->get_session_cb != NULL
350 && (ret = s->ctx->get_session_cb(s, session_id, len, ©))
352 s->ctx->stats.sess_cb_hit++;
355 * Increment reference count now if the session callback asks us
356 * to do so (note that if the session structures returned by the
357 * callback are shared between threads, it must handle the
358 * reference count itself [i.e. copy == 0], or things won't be
362 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION);
365 * Add the externally cached session to the internal cache as
366 * well if and only if we are supposed to.
370 ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
372 * The following should not return 1, otherwise, things are
375 SSL_CTX_add_session(s->ctx, ret);
381 /* Now ret is non-NULL, and we own one of its reference counts. */
383 if (ret->sid_ctx_length != s->sid_ctx_length
384 || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
386 * We've found the session named by the client, but we don't want to
387 * use it in this context.
390 #if 0 /* The client cannot always know when a
391 * session is not appropriate, so we
392 * shouldn't generate an error message. */
394 SSLerr(SSL_F_SSL_GET_PREV_SESSION,
395 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
397 goto err; /* treat like cache miss */
400 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
402 * We can't be sure if this session is being used out of context,
403 * which is especially important for SSL_VERIFY_PEER. The application
404 * should have used SSL[_CTX]_set_session_id_context. For this error
405 * case, we generate an error instead of treating the event like a
406 * cache miss (otherwise it would be easy for applications to
407 * effectively disable the session cache by accident without anyone
411 SSLerr(SSL_F_SSL_GET_PREV_SESSION,
412 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
417 if (ret->cipher == NULL) {
418 unsigned char buf[5], *p;
424 if ((ret->ssl_version >> 8) >= SSL3_VERSION_MAJOR)
425 ret->cipher = ssl_get_cipher_by_char(s, &(buf[2]));
427 ret->cipher = ssl_get_cipher_by_char(s, &(buf[1]));
428 if (ret->cipher == NULL)
431 #if 0 /* This is way too late. */
434 * If a thread got the session, then 'swaped', and another got it and
435 * then due to a time-out decided to 'OPENSSL_free' it we could be in
436 * trouble. So I'll increment it now, then double decrement later - am I
439 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION);
442 if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */
443 s->ctx->stats.sess_timeout++;
444 /* remove it from the cache */
445 SSL_CTX_remove_session(s->ctx, ret);
449 s->ctx->stats.sess_hit++;
451 /*- ret->time=time(NULL); *//*
455 * again, just leave the session if it is the same session, we have just
456 * incremented and then decremented the reference count :-)
458 if (s->session != NULL)
459 SSL_SESSION_free(s->session);
461 s->verify_result = s->session->verify_result;
466 SSL_SESSION_free(ret);
473 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
479 * add just 1 reference count for the SSL_CTX's session cache even though
480 * it has two ways of access: each session is in a doubly linked list and
483 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
485 * if session c is in already in cache, we take back the increment later
488 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
489 s = (SSL_SESSION *)lh_insert(ctx->sessions, c);
492 * s != NULL iff we already had a session with the given PID. In this
493 * case, s == c should hold (then we did not really modify
494 * ctx->sessions), or we're in trouble.
496 if (s != NULL && s != c) {
497 /* We *are* in trouble ... */
498 SSL_SESSION_list_remove(ctx, s);
501 * ... so pretend the other session did not exist in cache (we cannot
502 * handle two SSL_SESSION structures with identical session ID in the
503 * same cache, which could happen e.g. when two threads concurrently
504 * obtain the same session from an external cache)
509 /* Put at the head of the queue unless it is already in the cache */
511 SSL_SESSION_list_add(ctx, c);
515 * existing cache entry -- decrement previously incremented reference
516 * count because it already takes into account the cache
519 SSL_SESSION_free(s); /* s == c */
523 * new cache entry -- remove old ones if cache has become too large
528 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
529 while (SSL_CTX_sess_number(ctx) >
530 SSL_CTX_sess_get_cache_size(ctx)) {
531 if (!remove_session_lock(ctx, ctx->session_cache_tail, 0))
534 ctx->stats.sess_cache_full++;
538 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
542 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
544 return remove_session_lock(ctx, c, 1);
547 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
552 if ((c != NULL) && (c->session_id_length != 0)) {
554 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
555 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions, c)) == c) {
557 r = (SSL_SESSION *)lh_delete(ctx->sessions, c);
558 SSL_SESSION_list_remove(ctx, c);
562 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
565 r->not_resumable = 1;
566 if (ctx->remove_session_cb != NULL)
567 ctx->remove_session_cb(ctx, r);
575 void SSL_SESSION_free(SSL_SESSION *ss)
582 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
584 REF_PRINT("SSL_SESSION", ss);
590 fprintf(stderr, "SSL_SESSION_free, bad reference count\n");
595 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
597 OPENSSL_cleanse(ss->key_arg, sizeof ss->key_arg);
598 OPENSSL_cleanse(ss->master_key, sizeof ss->master_key);
599 OPENSSL_cleanse(ss->session_id, sizeof ss->session_id);
600 if (ss->sess_cert != NULL)
601 ssl_sess_cert_free(ss->sess_cert);
602 if (ss->peer != NULL)
604 if (ss->ciphers != NULL)
605 sk_SSL_CIPHER_free(ss->ciphers);
606 #ifndef OPENSSL_NO_TLSEXT
607 if (ss->tlsext_hostname != NULL)
608 OPENSSL_free(ss->tlsext_hostname);
609 if (ss->tlsext_tick != NULL)
610 OPENSSL_free(ss->tlsext_tick);
612 OPENSSL_cleanse(ss, sizeof(*ss));
616 int SSL_set_session(SSL *s, SSL_SESSION *session)
621 if (session != NULL) {
622 meth = s->ctx->method->get_ssl_method(session->ssl_version);
624 meth = s->method->get_ssl_method(session->ssl_version);
626 SSLerr(SSL_F_SSL_SET_SESSION, SSL_R_UNABLE_TO_FIND_SSL_METHOD);
630 if (meth != s->method) {
631 if (!SSL_set_ssl_method(s, meth))
633 if (s->ctx->session_timeout == 0)
634 session->timeout = SSL_get_default_timeout(s);
636 session->timeout = s->ctx->session_timeout;
638 #ifndef OPENSSL_NO_KRB5
639 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
640 session->krb5_client_princ_len > 0) {
641 s->kssl_ctx->client_princ =
642 (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
643 memcpy(s->kssl_ctx->client_princ, session->krb5_client_princ,
644 session->krb5_client_princ_len);
645 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
647 #endif /* OPENSSL_NO_KRB5 */
649 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL); */
650 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
651 if (s->session != NULL)
652 SSL_SESSION_free(s->session);
653 s->session = session;
654 s->verify_result = s->session->verify_result;
655 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL); */
658 if (s->session != NULL) {
659 SSL_SESSION_free(s->session);
663 meth = s->ctx->method;
664 if (meth != s->method) {
665 if (!SSL_set_ssl_method(s, meth))
673 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
681 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
688 long SSL_SESSION_get_time(const SSL_SESSION *s)
695 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
703 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
708 l = s->session_timeout;
709 s->session_timeout = t;
713 long SSL_CTX_get_timeout(const SSL_CTX *s)
717 return (s->session_timeout);
720 typedef struct timeout_param_st {
726 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
728 if ((p->time == 0) || (p->time > (s->time + s->timeout))) { /* timeout */
730 * The reason we don't call SSL_CTX_remove_session() is to save on
733 lh_delete(p->cache, s);
734 SSL_SESSION_list_remove(p->ctx, s);
735 s->not_resumable = 1;
736 if (p->ctx->remove_session_cb != NULL)
737 p->ctx->remove_session_cb(p->ctx, s);
742 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
744 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
750 tp.cache = s->sessions;
751 if (tp.cache == NULL)
754 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
755 i = tp.cache->down_load;
756 tp.cache->down_load = 0;
757 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
758 tp.cache->down_load = i;
759 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
762 int ssl_clear_bad_session(SSL *s)
764 if ((s->session != NULL) &&
765 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
766 !(SSL_in_init(s) || SSL_in_before(s))) {
767 SSL_CTX_remove_session(s->ctx, s->session);
773 /* locked by SSL_CTX in the calling function */
774 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
776 if ((s->next == NULL) || (s->prev == NULL))
779 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
780 /* last element in list */
781 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
782 /* only one element in list */
783 ctx->session_cache_head = NULL;
784 ctx->session_cache_tail = NULL;
786 ctx->session_cache_tail = s->prev;
787 s->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail);
790 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
791 /* first element in list */
792 ctx->session_cache_head = s->next;
793 s->next->prev = (SSL_SESSION *)&(ctx->session_cache_head);
796 s->next->prev = s->prev;
797 s->prev->next = s->next;
800 s->prev = s->next = NULL;
803 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
805 if ((s->next != NULL) && (s->prev != NULL))
806 SSL_SESSION_list_remove(ctx, s);
808 if (ctx->session_cache_head == NULL) {
809 ctx->session_cache_head = s;
810 ctx->session_cache_tail = s;
811 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
812 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
814 s->next = ctx->session_cache_head;
816 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
817 ctx->session_cache_head = s;
821 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
822 int (*cb) (struct ssl_st *ssl,
825 ctx->new_session_cb = cb;
828 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (SSL *ssl, SSL_SESSION *sess) {
829 return ctx->new_session_cb;
832 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
833 void (*cb) (SSL_CTX *ctx, SSL_SESSION *sess))
835 ctx->remove_session_cb = cb;
838 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (SSL_CTX *ctx,
840 return ctx->remove_session_cb;
843 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
844 SSL_SESSION *(*cb) (struct ssl_st *ssl,
845 unsigned char *data, int len,
848 ctx->get_session_cb = cb;
851 SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (SSL *ssl,
853 int len, int *copy) {
854 return ctx->get_session_cb;
857 void SSL_CTX_set_info_callback(SSL_CTX *ctx,
858 void (*cb) (const SSL *ssl, int type, int val))
860 ctx->info_callback = cb;
863 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type,
865 return ctx->info_callback;
868 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
869 int (*cb) (SSL *ssl, X509 **x509,
872 ctx->client_cert_cb = cb;
875 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509,
877 return ctx->client_cert_cb;
880 #ifndef OPENSSL_NO_ENGINE
881 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
883 if (!ENGINE_init(e)) {
884 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB);
887 if (!ENGINE_get_ssl_client_cert_function(e)) {
888 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
889 SSL_R_NO_CLIENT_CERT_METHOD);
893 ctx->client_cert_engine = e;
898 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
900 unsigned char *cookie,
901 unsigned int *cookie_len))
903 ctx->app_gen_cookie_cb = cb;
906 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
907 int (*cb) (SSL *ssl, unsigned char *cookie,
908 unsigned int cookie_len))
910 ctx->app_verify_cookie_cb = cb;