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>
64 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
65 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
66 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
68 SSL_SESSION *SSL_get_session(const SSL *ssl)
69 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
74 SSL_SESSION *SSL_get1_session(SSL *ssl)
75 /* variant of SSL_get_session: caller really gets something */
78 /* Need to lock this all up rather than just use CRYPTO_add so that
79 * somebody doesn't free ssl->session between when we check it's
80 * non-null and when we up the reference count. */
81 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
85 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
89 int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
90 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
92 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
93 new_func, dup_func, free_func);
96 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
98 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
101 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
103 return(CRYPTO_get_ex_data(&s->ex_data,idx));
106 SSL_SESSION *SSL_SESSION_new(void)
110 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
113 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
116 memset(ss,0,sizeof(SSL_SESSION));
118 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
120 ss->timeout=60*5+4; /* 5 minute timeout by default */
121 ss->time=(unsigned long)time(NULL);
125 #ifndef OPENSSL_NO_TLSEXT
126 ss->tlsext_hostname = NULL;
128 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
132 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
135 *len = s->session_id_length;
136 return s->session_id;
139 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
140 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
141 * until we have no conflict is going to complete in one iteration pretty much
142 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
143 * and we still can't avoid a conflict - well that's a reasonable point to call
144 * it quits. Either the RAND code is broken or someone is trying to open roughly
145 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
146 * store that many sessions is perhaps a more interesting question ... */
148 #define MAX_SESS_ID_ATTEMPTS 10
149 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
150 unsigned int *id_len)
152 unsigned int retry = 0;
154 if (RAND_pseudo_bytes(id, *id_len) <= 0)
156 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
157 (++retry < MAX_SESS_ID_ATTEMPTS));
158 if(retry < MAX_SESS_ID_ATTEMPTS)
160 /* else - woops a session_id match */
161 /* XXX We should also check the external cache --
162 * but the probability of a collision is negligible, and
163 * we could not prevent the concurrent creation of sessions
164 * with identical IDs since we currently don't have means
165 * to atomically check whether a session ID already exists
166 * and make a reservation for it if it does not
167 * (this problem applies to the internal cache as well).
172 int ssl_get_new_session(SSL *s, int session)
174 /* This gets used by clients and servers. */
177 SSL_SESSION *ss=NULL;
178 GEN_SESSION_CB cb = def_generate_session_id;
180 if ((ss=SSL_SESSION_new()) == NULL) return(0);
182 /* If the context has a default timeout, use it */
183 if (s->ctx->session_timeout == 0)
184 ss->timeout=SSL_get_default_timeout(s);
186 ss->timeout=s->ctx->session_timeout;
188 if (s->session != NULL)
190 SSL_SESSION_free(s->session);
196 if (s->version == SSL2_VERSION)
198 ss->ssl_version=SSL2_VERSION;
199 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
201 else if (s->version == SSL3_VERSION)
203 ss->ssl_version=SSL3_VERSION;
204 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
206 else if (s->version == TLS1_VERSION)
208 ss->ssl_version=TLS1_VERSION;
209 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
211 else if (s->version == DTLS1_VERSION)
213 ss->ssl_version=DTLS1_VERSION;
214 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
218 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
219 SSL_SESSION_free(ss);
222 #ifndef OPENSSL_NO_TLSEXT
223 /* If RFC4507 ticket use empty session ID */
224 if (s->tlsext_ticket_expected)
226 ss->session_id_length = 0;
230 /* Choose which callback will set the session ID */
231 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
232 if(s->generate_session_id)
233 cb = s->generate_session_id;
234 else if(s->ctx->generate_session_id)
235 cb = s->ctx->generate_session_id;
236 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
237 /* Choose a session ID */
238 tmp = ss->session_id_length;
239 if(!cb(s, ss->session_id, &tmp))
241 /* The callback failed */
242 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
243 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
244 SSL_SESSION_free(ss);
247 /* Don't allow the callback to set the session length to zero.
248 * nor set it higher than it was. */
249 if(!tmp || (tmp > ss->session_id_length))
251 /* The callback set an illegal length */
252 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
253 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
254 SSL_SESSION_free(ss);
257 /* If the session length was shrunk and we're SSLv2, pad it */
258 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
259 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
261 ss->session_id_length = tmp;
262 /* Finally, check for a conflict */
263 if(SSL_has_matching_session_id(s, ss->session_id,
264 ss->session_id_length))
266 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
267 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);
285 ss->session_id_length=0;
288 if (s->sid_ctx_length > sizeof ss->sid_ctx)
290 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
291 SSL_SESSION_free(ss);
294 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
295 ss->sid_ctx_length=s->sid_ctx_length;
297 ss->ssl_version=s->version;
298 ss->verify_result = X509_V_OK;
303 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
304 const unsigned char *limit)
306 /* This is used only by servers. */
308 SSL_SESSION *ret=NULL;
310 #ifndef OPENSSL_NO_TLSEXT
314 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
316 #ifndef OPENSSL_NO_TLSEXT
317 r = tls1_process_ticket(s, session_id, len, limit, &ret);
325 else if (!ret && !(s->session_ctx->session_cache_mode & 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);
348 s->ctx->stats.sess_miss++;
350 if (s->ctx->get_session_cb != NULL
351 && (ret=s->ctx->get_session_cb(s,session_id,len,©))
354 s->ctx->stats.sess_cb_hit++;
356 /* Increment reference count now if the session callback
357 * asks us to do so (note that if the session structures
358 * returned by the callback are shared between threads,
359 * it must handle the reference count itself [i.e. copy == 0],
360 * or things won't be thread-safe). */
362 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
364 /* Add the externally cached session to the internal
365 * cache as well if and only if we are supposed to. */
366 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
367 /* The following should not return 1, otherwise,
368 * things are very strange */
369 SSL_CTX_add_session(s->ctx,ret);
375 /* Now ret is non-NULL, and we own one of its reference counts. */
377 if (ret->sid_ctx_length != s->sid_ctx_length
378 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))
380 /* We've found the session named by the client, but we don't
381 * want to use it in this context. */
383 #if 0 /* The client cannot always know when a session is not appropriate,
384 * so we shouldn't generate an error message. */
386 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
388 goto err; /* treat like cache miss */
391 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)
393 /* We can't be sure if this session is being used out of
394 * context, which is especially important for SSL_VERIFY_PEER.
395 * The application should have used SSL[_CTX]_set_session_id_context.
397 * For this error case, we generate an error instead of treating
398 * the event like a cache miss (otherwise it would be easy for
399 * applications to effectively disable the session cache by
400 * accident without anyone noticing).
403 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
408 if (ret->cipher == NULL)
410 unsigned char buf[5],*p;
416 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
417 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
419 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
420 if (ret->cipher == NULL)
425 #if 0 /* This is way too late. */
427 /* If a thread got the session, then 'swaped', and another got
428 * it and then due to a time-out decided to 'OPENSSL_free' it we could
429 * be in trouble. So I'll increment it now, then double decrement
430 * later - am I speaking rubbish?. */
431 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
434 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
436 s->ctx->stats.sess_timeout++;
437 /* remove it from the cache */
438 SSL_CTX_remove_session(s->ctx,ret);
442 s->ctx->stats.sess_hit++;
444 /* ret->time=time(NULL); */ /* rezero timeout? */
445 /* again, just leave the session
446 * if it is the same session, we have just incremented and
447 * then decremented the reference count :-) */
448 if (s->session != NULL)
449 SSL_SESSION_free(s->session);
451 s->verify_result = s->session->verify_result;
456 SSL_SESSION_free(ret);
463 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
468 /* add just 1 reference count for the SSL_CTX's session cache
469 * even though it has two ways of access: each session is in a
470 * doubly linked list and an lhash */
471 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
472 /* if session c is in already in cache, we take back the increment later */
474 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
475 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
477 /* s != NULL iff we already had a session with the given PID.
478 * In this case, s == c should hold (then we did not really modify
479 * ctx->sessions), or we're in trouble. */
480 if (s != NULL && s != c)
482 /* We *are* in trouble ... */
483 SSL_SESSION_list_remove(ctx,s);
485 /* ... so pretend the other session did not exist in cache
486 * (we cannot handle two SSL_SESSION structures with identical
487 * session ID in the same cache, which could happen e.g. when
488 * two threads concurrently obtain the same session from an external
493 /* Put at the head of the queue unless it is already in the cache */
495 SSL_SESSION_list_add(ctx,c);
499 /* existing cache entry -- decrement previously incremented reference
500 * count because it already takes into account the cache */
502 SSL_SESSION_free(s); /* s == c */
507 /* new cache entry -- remove old ones if cache has become too large */
511 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
513 while (SSL_CTX_sess_number(ctx) >
514 SSL_CTX_sess_get_cache_size(ctx))
516 if (!remove_session_lock(ctx,
517 ctx->session_cache_tail, 0))
520 ctx->stats.sess_cache_full++;
524 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
528 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
530 return remove_session_lock(ctx, c, 1);
533 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
538 if ((c != NULL) && (c->session_id_length != 0))
540 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
541 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
544 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
545 SSL_SESSION_list_remove(ctx,c);
548 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
553 if (ctx->remove_session_cb != NULL)
554 ctx->remove_session_cb(ctx,r);
563 void SSL_SESSION_free(SSL_SESSION *ss)
570 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
572 REF_PRINT("SSL_SESSION",ss);
578 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
583 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
585 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
586 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
587 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
588 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
589 if (ss->peer != NULL) X509_free(ss->peer);
590 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
591 #ifndef OPENSSL_NO_TLSEXT
592 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
593 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick);
595 OPENSSL_cleanse(ss,sizeof(*ss));
599 int SSL_set_session(SSL *s, SSL_SESSION *session)
606 meth=s->ctx->method->get_ssl_method(session->ssl_version);
608 meth=s->method->get_ssl_method(session->ssl_version);
611 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
615 if (meth != s->method)
617 if (!SSL_set_ssl_method(s,meth))
619 if (s->ctx->session_timeout == 0)
620 session->timeout=SSL_get_default_timeout(s);
622 session->timeout=s->ctx->session_timeout;
625 #ifndef OPENSSL_NO_KRB5
626 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
627 session->krb5_client_princ_len > 0)
629 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
630 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
631 session->krb5_client_princ_len);
632 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
634 #endif /* OPENSSL_NO_KRB5 */
636 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
637 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
638 if (s->session != NULL)
639 SSL_SESSION_free(s->session);
641 s->verify_result = s->session->verify_result;
642 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
647 if (s->session != NULL)
649 SSL_SESSION_free(s->session);
654 if (meth != s->method)
656 if (!SSL_set_ssl_method(s,meth))
664 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
666 if (s == NULL) return(0);
671 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
673 if (s == NULL) return(0);
677 long SSL_SESSION_get_time(const SSL_SESSION *s)
679 if (s == NULL) return(0);
683 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
685 if (s == NULL) return(0);
690 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
693 if (s == NULL) return(0);
694 l=s->session_timeout;
695 s->session_timeout=t;
699 long SSL_CTX_get_timeout(const SSL_CTX *s)
701 if (s == NULL) return(0);
702 return(s->session_timeout);
705 typedef struct timeout_param_st
712 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
714 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
716 /* The reason we don't call SSL_CTX_remove_session() is to
717 * save on locking overhead */
718 lh_delete(p->cache,s);
719 SSL_SESSION_list_remove(p->ctx,s);
721 if (p->ctx->remove_session_cb != NULL)
722 p->ctx->remove_session_cb(p->ctx,s);
727 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
729 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
735 tp.cache=s->sessions;
736 if (tp.cache == NULL) return;
738 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
739 i=tp.cache->down_load;
740 tp.cache->down_load=0;
741 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
742 tp.cache->down_load=i;
743 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
746 int ssl_clear_bad_session(SSL *s)
748 if ( (s->session != NULL) &&
749 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
750 !(SSL_in_init(s) || SSL_in_before(s)))
752 SSL_CTX_remove_session(s->ctx,s->session);
759 /* locked by SSL_CTX in the calling function */
760 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
762 if ((s->next == NULL) || (s->prev == NULL)) return;
764 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
765 { /* last element in list */
766 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
767 { /* only one element in list */
768 ctx->session_cache_head=NULL;
769 ctx->session_cache_tail=NULL;
773 ctx->session_cache_tail=s->prev;
774 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
779 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
780 { /* first element in list */
781 ctx->session_cache_head=s->next;
782 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
785 { /* middle of list */
786 s->next->prev=s->prev;
787 s->prev->next=s->next;
790 s->prev=s->next=NULL;
793 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
795 if ((s->next != NULL) && (s->prev != NULL))
796 SSL_SESSION_list_remove(ctx,s);
798 if (ctx->session_cache_head == NULL)
800 ctx->session_cache_head=s;
801 ctx->session_cache_tail=s;
802 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
803 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
807 s->next=ctx->session_cache_head;
809 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
810 ctx->session_cache_head=s;
814 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
815 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))
817 ctx->new_session_cb=cb;
820 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
822 return ctx->new_session_cb;
825 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
826 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))
828 ctx->remove_session_cb=cb;
831 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)
833 return ctx->remove_session_cb;
836 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
837 SSL_SESSION *(*cb)(struct ssl_st *ssl,
838 unsigned char *data,int len,int *copy))
840 ctx->get_session_cb=cb;
843 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,
844 unsigned char *data,int len,int *copy)
846 return ctx->get_session_cb;
849 void SSL_CTX_set_info_callback(SSL_CTX *ctx,
850 void (*cb)(const SSL *ssl,int type,int val))
852 ctx->info_callback=cb;
855 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)
857 return ctx->info_callback;
860 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
861 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
863 ctx->client_cert_cb=cb;
866 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)
868 return ctx->client_cert_cb;
871 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
872 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
874 ctx->app_gen_cookie_cb=cb;
877 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
878 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
880 ctx->app_verify_cookie_cb=cb;