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 */
77 SSL_SESSION *SSL_get1_session(SSL *ssl)
78 /* variant of SSL_get_session: caller really gets something */
81 /* Need to lock this all up rather than just use CRYPTO_add so that
82 * somebody doesn't free ssl->session between when we check it's
83 * non-null and when we up the reference count. */
84 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
88 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
92 int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
93 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
95 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
96 new_func, dup_func, free_func);
99 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
101 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
104 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
106 return(CRYPTO_get_ex_data(&s->ex_data,idx));
109 SSL_SESSION *SSL_SESSION_new(void)
113 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
116 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
119 memset(ss,0,sizeof(SSL_SESSION));
121 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
123 ss->timeout=60*5+4; /* 5 minute timeout by default */
124 ss->time=(unsigned long)time(NULL);
128 #ifndef OPENSSL_NO_TLSEXT
129 ss->tlsext_hostname = NULL;
131 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
135 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
138 *len = s->session_id_length;
139 return s->session_id;
142 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
143 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
144 * until we have no conflict is going to complete in one iteration pretty much
145 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
146 * and we still can't avoid a conflict - well that's a reasonable point to call
147 * it quits. Either the RAND code is broken or someone is trying to open roughly
148 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
149 * store that many sessions is perhaps a more interesting question ... */
151 #define MAX_SESS_ID_ATTEMPTS 10
152 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
153 unsigned int *id_len)
155 unsigned int retry = 0;
157 if (RAND_pseudo_bytes(id, *id_len) <= 0)
159 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
160 (++retry < MAX_SESS_ID_ATTEMPTS));
161 if(retry < MAX_SESS_ID_ATTEMPTS)
163 /* else - woops a session_id match */
164 /* XXX We should also check the external cache --
165 * but the probability of a collision is negligible, and
166 * we could not prevent the concurrent creation of sessions
167 * with identical IDs since we currently don't have means
168 * to atomically check whether a session ID already exists
169 * and make a reservation for it if it does not
170 * (this problem applies to the internal cache as well).
175 int ssl_get_new_session(SSL *s, int session)
177 /* This gets used by clients and servers. */
180 SSL_SESSION *ss=NULL;
181 GEN_SESSION_CB cb = def_generate_session_id;
183 if ((ss=SSL_SESSION_new()) == NULL) return(0);
185 /* If the context has a default timeout, use it */
186 if (s->ctx->session_timeout == 0)
187 ss->timeout=SSL_get_default_timeout(s);
189 ss->timeout=s->ctx->session_timeout;
191 if (s->session != NULL)
193 SSL_SESSION_free(s->session);
199 if (s->version == SSL2_VERSION)
201 ss->ssl_version=SSL2_VERSION;
202 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
204 else if (s->version == SSL3_VERSION)
206 ss->ssl_version=SSL3_VERSION;
207 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
209 else if (s->version == TLS1_VERSION)
211 ss->ssl_version=TLS1_VERSION;
212 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
214 else if (s->version == DTLS1_BAD_VER)
216 ss->ssl_version=DTLS1_BAD_VER;
217 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
219 else if (s->version == DTLS1_VERSION)
221 ss->ssl_version=DTLS1_VERSION;
222 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
226 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
227 SSL_SESSION_free(ss);
230 #ifndef OPENSSL_NO_TLSEXT
231 /* If RFC4507 ticket use empty session ID */
232 if (s->tlsext_ticket_expected)
234 ss->session_id_length = 0;
238 /* Choose which callback will set the session ID */
239 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
240 if(s->generate_session_id)
241 cb = s->generate_session_id;
242 else if(s->ctx->generate_session_id)
243 cb = s->ctx->generate_session_id;
244 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
245 /* Choose a session ID */
246 tmp = ss->session_id_length;
247 if(!cb(s, ss->session_id, &tmp))
249 /* The callback failed */
250 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
251 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
252 SSL_SESSION_free(ss);
255 /* Don't allow the callback to set the session length to zero.
256 * nor set it higher than it was. */
257 if(!tmp || (tmp > ss->session_id_length))
259 /* The callback set an illegal length */
260 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
261 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
262 SSL_SESSION_free(ss);
265 /* If the session length was shrunk and we're SSLv2, pad it */
266 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
267 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
269 ss->session_id_length = tmp;
270 /* Finally, check for a conflict */
271 if(SSL_has_matching_session_id(s, ss->session_id,
272 ss->session_id_length))
274 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
275 SSL_R_SSL_SESSION_ID_CONFLICT);
276 SSL_SESSION_free(ss);
279 #ifndef OPENSSL_NO_TLSEXT
281 if (s->tlsext_hostname) {
282 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
283 if (ss->tlsext_hostname == NULL) {
284 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
285 SSL_SESSION_free(ss);
293 ss->session_id_length=0;
296 if (s->sid_ctx_length > sizeof ss->sid_ctx)
298 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
299 SSL_SESSION_free(ss);
302 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
303 ss->sid_ctx_length=s->sid_ctx_length;
305 ss->ssl_version=s->version;
306 ss->verify_result = X509_V_OK;
311 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
312 const unsigned char *limit)
314 /* This is used only by servers. */
316 SSL_SESSION *ret=NULL;
318 #ifndef OPENSSL_NO_TLSEXT
322 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
324 #ifndef OPENSSL_NO_TLSEXT
325 r = tls1_process_ticket(s, session_id, len, limit, &ret);
331 else if (r == 0 || (!ret && !len))
333 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
337 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
341 data.ssl_version=s->version;
342 data.session_id_length=len;
345 memcpy(data.session_id,session_id,len);
346 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
347 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
349 /* don't allow other threads to steal it: */
350 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
351 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
358 s->ctx->stats.sess_miss++;
360 if (s->ctx->get_session_cb != NULL
361 && (ret=s->ctx->get_session_cb(s,session_id,len,©))
364 s->ctx->stats.sess_cb_hit++;
366 /* Increment reference count now if the session callback
367 * asks us to do so (note that if the session structures
368 * returned by the callback are shared between threads,
369 * it must handle the reference count itself [i.e. copy == 0],
370 * or things won't be thread-safe). */
372 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
374 /* Add the externally cached session to the internal
375 * cache as well if and only if we are supposed to. */
376 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
377 /* The following should not return 1, otherwise,
378 * things are very strange */
379 SSL_CTX_add_session(s->ctx,ret);
385 /* Now ret is non-NULL, and we own one of its reference counts. */
387 if (ret->sid_ctx_length != s->sid_ctx_length
388 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))
390 /* We've found the session named by the client, but we don't
391 * want to use it in this context. */
393 #if 0 /* The client cannot always know when a session is not appropriate,
394 * so we shouldn't generate an error message. */
396 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
398 goto err; /* treat like cache miss */
401 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)
403 /* We can't be sure if this session is being used out of
404 * context, which is especially important for SSL_VERIFY_PEER.
405 * The application should have used SSL[_CTX]_set_session_id_context.
407 * For this error case, we generate an error instead of treating
408 * the event like a cache miss (otherwise it would be easy for
409 * applications to effectively disable the session cache by
410 * accident without anyone noticing).
413 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
418 if (ret->cipher == NULL)
420 unsigned char buf[5],*p;
426 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
427 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
429 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
430 if (ret->cipher == NULL)
435 #if 0 /* This is way too late. */
437 /* If a thread got the session, then 'swaped', and another got
438 * it and then due to a time-out decided to 'OPENSSL_free' it we could
439 * be in trouble. So I'll increment it now, then double decrement
440 * later - am I speaking rubbish?. */
441 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
444 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
446 s->ctx->stats.sess_timeout++;
447 /* remove it from the cache */
448 SSL_CTX_remove_session(s->ctx,ret);
452 s->ctx->stats.sess_hit++;
454 /* ret->time=time(NULL); */ /* rezero timeout? */
455 /* again, just leave the session
456 * if it is the same session, we have just incremented and
457 * 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)
478 /* add just 1 reference count for the SSL_CTX's session cache
479 * even though it has two ways of access: each session is in a
480 * doubly linked list and an lhash */
481 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
482 /* if session c is in already in cache, we take back the increment later */
484 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
485 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
487 /* s != NULL iff we already had a session with the given PID.
488 * In this case, s == c should hold (then we did not really modify
489 * ctx->sessions), or we're in trouble. */
490 if (s != NULL && s != c)
492 /* We *are* in trouble ... */
493 SSL_SESSION_list_remove(ctx,s);
495 /* ... so pretend the other session did not exist in cache
496 * (we cannot handle two SSL_SESSION structures with identical
497 * session ID in the same cache, which could happen e.g. when
498 * two threads concurrently obtain the same session from an external
503 /* Put at the head of the queue unless it is already in the cache */
505 SSL_SESSION_list_add(ctx,c);
509 /* existing cache entry -- decrement previously incremented reference
510 * count because it already takes into account the cache */
512 SSL_SESSION_free(s); /* s == c */
517 /* new cache entry -- remove old ones if cache has become too large */
521 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
523 while (SSL_CTX_sess_number(ctx) >
524 SSL_CTX_sess_get_cache_size(ctx))
526 if (!remove_session_lock(ctx,
527 ctx->session_cache_tail, 0))
530 ctx->stats.sess_cache_full++;
534 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
538 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
540 return remove_session_lock(ctx, c, 1);
543 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
548 if ((c != NULL) && (c->session_id_length != 0))
550 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
551 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
554 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
555 SSL_SESSION_list_remove(ctx,c);
558 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
563 if (ctx->remove_session_cb != NULL)
564 ctx->remove_session_cb(ctx,r);
573 void SSL_SESSION_free(SSL_SESSION *ss)
580 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
582 REF_PRINT("SSL_SESSION",ss);
588 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
593 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
595 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
596 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
597 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
598 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
599 if (ss->peer != NULL) X509_free(ss->peer);
600 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
601 #ifndef OPENSSL_NO_TLSEXT
602 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
603 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick);
605 OPENSSL_cleanse(ss,sizeof(*ss));
609 int SSL_set_session(SSL *s, SSL_SESSION *session)
616 meth=s->ctx->method->get_ssl_method(session->ssl_version);
618 meth=s->method->get_ssl_method(session->ssl_version);
621 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
625 if (meth != s->method)
627 if (!SSL_set_ssl_method(s,meth))
629 if (s->ctx->session_timeout == 0)
630 session->timeout=SSL_get_default_timeout(s);
632 session->timeout=s->ctx->session_timeout;
635 #ifndef OPENSSL_NO_KRB5
636 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
637 session->krb5_client_princ_len > 0)
639 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
640 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
641 session->krb5_client_princ_len);
642 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
644 #endif /* OPENSSL_NO_KRB5 */
646 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
647 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
648 if (s->session != NULL)
649 SSL_SESSION_free(s->session);
651 s->verify_result = s->session->verify_result;
652 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
657 if (s->session != NULL)
659 SSL_SESSION_free(s->session);
664 if (meth != s->method)
666 if (!SSL_set_ssl_method(s,meth))
674 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
676 if (s == NULL) return(0);
681 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
683 if (s == NULL) return(0);
687 long SSL_SESSION_get_time(const SSL_SESSION *s)
689 if (s == NULL) return(0);
693 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
695 if (s == NULL) return(0);
700 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
703 if (s == NULL) return(0);
704 l=s->session_timeout;
705 s->session_timeout=t;
709 long SSL_CTX_get_timeout(const SSL_CTX *s)
711 if (s == NULL) return(0);
712 return(s->session_timeout);
715 typedef struct timeout_param_st
722 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
724 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
726 /* The reason we don't call SSL_CTX_remove_session() is to
727 * save on locking overhead */
728 lh_delete(p->cache,s);
729 SSL_SESSION_list_remove(p->ctx,s);
731 if (p->ctx->remove_session_cb != NULL)
732 p->ctx->remove_session_cb(p->ctx,s);
737 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
739 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
745 tp.cache=s->sessions;
746 if (tp.cache == NULL) return;
748 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
749 i=tp.cache->down_load;
750 tp.cache->down_load=0;
751 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
752 tp.cache->down_load=i;
753 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
756 int ssl_clear_bad_session(SSL *s)
758 if ( (s->session != NULL) &&
759 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
760 !(SSL_in_init(s) || SSL_in_before(s)))
762 SSL_CTX_remove_session(s->ctx,s->session);
769 /* locked by SSL_CTX in the calling function */
770 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
772 if ((s->next == NULL) || (s->prev == NULL)) return;
774 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
775 { /* last element in list */
776 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
777 { /* only one element in list */
778 ctx->session_cache_head=NULL;
779 ctx->session_cache_tail=NULL;
783 ctx->session_cache_tail=s->prev;
784 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
789 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
790 { /* first element in list */
791 ctx->session_cache_head=s->next;
792 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
795 { /* middle of list */
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)
810 ctx->session_cache_head=s;
811 ctx->session_cache_tail=s;
812 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
813 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
817 s->next=ctx->session_cache_head;
819 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
820 ctx->session_cache_head=s;
824 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
825 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))
827 ctx->new_session_cb=cb;
830 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
832 return ctx->new_session_cb;
835 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
836 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))
838 ctx->remove_session_cb=cb;
841 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)
843 return ctx->remove_session_cb;
846 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
847 SSL_SESSION *(*cb)(struct ssl_st *ssl,
848 unsigned char *data,int len,int *copy))
850 ctx->get_session_cb=cb;
853 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,
854 unsigned char *data,int len,int *copy)
856 return ctx->get_session_cb;
859 void SSL_CTX_set_info_callback(SSL_CTX *ctx,
860 void (*cb)(const SSL *ssl,int type,int val))
862 ctx->info_callback=cb;
865 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)
867 return ctx->info_callback;
870 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
871 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
873 ctx->client_cert_cb=cb;
876 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)
878 return ctx->client_cert_cb;
881 #ifndef OPENSSL_NO_ENGINE
882 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
886 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB);
889 if(!ENGINE_get_ssl_client_cert_function(e))
891 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD);
895 ctx->client_cert_engine = e;
900 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
901 int (*cb)(SSL *ssl, unsigned char *cookie, 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, unsigned int cookie_len))
909 ctx->app_verify_cookie_cb=cb;