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.]
58 /* ====================================================================
59 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
113 #include <openssl/lhash.h>
114 #include <openssl/rand.h>
115 #include "ssl_locl.h"
117 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
118 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
119 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
121 SSL_SESSION *SSL_get_session(const SSL *ssl)
122 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
124 return(ssl->session);
127 SSL_SESSION *SSL_get1_session(SSL *ssl)
128 /* variant of SSL_get_session: caller really gets something */
131 /* Need to lock this all up rather than just use CRYPTO_add so that
132 * somebody doesn't free ssl->session between when we check it's
133 * non-null and when we up the reference count. */
134 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
138 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
142 int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
143 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
145 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
146 new_func, dup_func, free_func);
149 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
151 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
154 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
156 return(CRYPTO_get_ex_data(&s->ex_data,idx));
159 SSL_SESSION *SSL_SESSION_new(void)
163 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
166 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
169 memset(ss,0,sizeof(SSL_SESSION));
171 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
173 ss->timeout=60*5+4; /* 5 minute timeout by default */
174 ss->time=(unsigned long)time(NULL);
178 #ifndef OPENSSL_NO_TLSEXT
179 ss->tlsext_hostname = NULL;
181 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
185 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
188 *len = s->session_id_length;
189 return s->session_id;
192 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
193 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
194 * until we have no conflict is going to complete in one iteration pretty much
195 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
196 * and we still can't avoid a conflict - well that's a reasonable point to call
197 * it quits. Either the RAND code is broken or someone is trying to open roughly
198 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
199 * store that many sessions is perhaps a more interesting question ... */
201 #define MAX_SESS_ID_ATTEMPTS 10
202 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
203 unsigned int *id_len)
205 unsigned int retry = 0;
207 if (RAND_pseudo_bytes(id, *id_len) <= 0)
209 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
210 (++retry < MAX_SESS_ID_ATTEMPTS));
211 if(retry < MAX_SESS_ID_ATTEMPTS)
213 /* else - woops a session_id match */
214 /* XXX We should also check the external cache --
215 * but the probability of a collision is negligible, and
216 * we could not prevent the concurrent creation of sessions
217 * with identical IDs since we currently don't have means
218 * to atomically check whether a session ID already exists
219 * and make a reservation for it if it does not
220 * (this problem applies to the internal cache as well).
225 int ssl_get_new_session(SSL *s, int session)
227 /* This gets used by clients and servers. */
230 SSL_SESSION *ss=NULL;
231 GEN_SESSION_CB cb = def_generate_session_id;
233 if ((ss=SSL_SESSION_new()) == NULL) return(0);
235 /* If the context has a default timeout, use it */
236 if (s->ctx->session_timeout == 0)
237 ss->timeout=SSL_get_default_timeout(s);
239 ss->timeout=s->ctx->session_timeout;
241 if (s->session != NULL)
243 SSL_SESSION_free(s->session);
249 if (s->version == SSL2_VERSION)
251 ss->ssl_version=SSL2_VERSION;
252 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
254 else if (s->version == SSL3_VERSION)
256 ss->ssl_version=SSL3_VERSION;
257 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
259 else if (s->version == TLS1_VERSION)
261 ss->ssl_version=TLS1_VERSION;
262 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
264 else if (s->version == DTLS1_VERSION)
266 ss->ssl_version=DTLS1_VERSION;
267 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
271 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
272 SSL_SESSION_free(ss);
275 /* Choose which callback will set the session ID */
276 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
277 if(s->generate_session_id)
278 cb = s->generate_session_id;
279 else if(s->ctx->generate_session_id)
280 cb = s->ctx->generate_session_id;
281 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
282 /* Choose a session ID */
283 tmp = ss->session_id_length;
284 if(!cb(s, ss->session_id, &tmp))
286 /* The callback failed */
287 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
288 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
289 SSL_SESSION_free(ss);
292 /* Don't allow the callback to set the session length to zero.
293 * nor set it higher than it was. */
294 if(!tmp || (tmp > ss->session_id_length))
296 /* The callback set an illegal length */
297 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
298 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
299 SSL_SESSION_free(ss);
302 /* If the session length was shrunk and we're SSLv2, pad it */
303 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
304 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
306 ss->session_id_length = tmp;
307 /* Finally, check for a conflict */
308 if(SSL_has_matching_session_id(s, ss->session_id,
309 ss->session_id_length))
311 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
312 SSL_R_SSL_SESSION_ID_CONFLICT);
313 SSL_SESSION_free(ss);
319 ss->session_id_length=0;
322 if (s->sid_ctx_length > sizeof ss->sid_ctx)
324 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
325 SSL_SESSION_free(ss);
328 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
329 ss->sid_ctx_length=s->sid_ctx_length;
331 ss->ssl_version=s->version;
332 ss->verify_result = X509_V_OK;
337 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len)
339 /* This is used only by servers. */
341 SSL_SESSION *ret=NULL,data;
344 data.ssl_version=s->version;
345 data.session_id_length=len;
346 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
348 memcpy(data.session_id,session_id,len);
350 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
352 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
353 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
355 /* don't allow other threads to steal it: */
356 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
357 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
364 s->ctx->stats.sess_miss++;
366 if (s->ctx->get_session_cb != NULL
367 && (ret=s->ctx->get_session_cb(s,session_id,len,©))
370 s->ctx->stats.sess_cb_hit++;
372 /* Increment reference count now if the session callback
373 * asks us to do so (note that if the session structures
374 * returned by the callback are shared between threads,
375 * it must handle the reference count itself [i.e. copy == 0],
376 * or things won't be thread-safe). */
378 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
380 /* Add the externally cached session to the internal
381 * cache as well if and only if we are supposed to. */
382 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
383 /* The following should not return 1, otherwise,
384 * things are very strange */
385 SSL_CTX_add_session(s->ctx,ret);
391 /* Now ret is non-NULL, and we own one of its reference counts. */
393 if((s->verify_mode&SSL_VERIFY_PEER)
394 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length
395 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)))
397 /* We've found the session named by the client, but we don't
398 * want to use it in this context. */
400 if (s->sid_ctx_length == 0)
402 /* application should have used SSL[_CTX]_set_session_id_context
403 * -- we could tolerate this and just pretend we never heard
404 * of this session, but then applications could effectively
405 * disable the session cache by accident without anyone noticing */
407 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
413 #if 0 /* The client cannot always know when a session is not appropriate,
414 * so we shouldn't generate an error message. */
416 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
418 goto err; /* treat like cache miss */
422 if (ret->cipher == NULL)
424 unsigned char buf[5],*p;
430 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
431 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
433 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
434 if (ret->cipher == NULL)
439 #if 0 /* This is way too late. */
441 /* If a thread got the session, then 'swaped', and another got
442 * it and then due to a time-out decided to 'OPENSSL_free' it we could
443 * be in trouble. So I'll increment it now, then double decrement
444 * later - am I speaking rubbish?. */
445 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
448 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
450 s->ctx->stats.sess_timeout++;
451 /* remove it from the cache */
452 SSL_CTX_remove_session(s->ctx,ret);
456 s->ctx->stats.sess_hit++;
458 /* ret->time=time(NULL); */ /* rezero timeout? */
459 /* again, just leave the session
460 * if it is the same session, we have just incremented and
461 * then decremented the reference count :-) */
462 if (s->session != NULL)
463 SSL_SESSION_free(s->session);
465 s->verify_result = s->session->verify_result;
470 SSL_SESSION_free(ret);
477 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
482 /* add just 1 reference count for the SSL_CTX's session cache
483 * even though it has two ways of access: each session is in a
484 * doubly linked list and an lhash */
485 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
486 /* 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);
491 /* s != NULL iff we already had a session with the given PID.
492 * In this case, s == c should hold (then we did not really modify
493 * ctx->sessions), or we're in trouble. */
494 if (s != NULL && s != c)
496 /* We *are* in trouble ... */
497 SSL_SESSION_list_remove(ctx,s);
499 /* ... so pretend the other session did not exist in cache
500 * (we cannot handle two SSL_SESSION structures with identical
501 * session ID in the same cache, which could happen e.g. when
502 * two threads concurrently obtain the same session from an external
507 /* Put at the head of the queue unless it is already in the cache */
509 SSL_SESSION_list_add(ctx,c);
513 /* existing cache entry -- decrement previously incremented reference
514 * count because it already takes into account the cache */
516 SSL_SESSION_free(s); /* s == c */
521 /* new cache entry -- remove old ones if cache has become too large */
525 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
527 while (SSL_CTX_sess_number(ctx) >
528 SSL_CTX_sess_get_cache_size(ctx))
530 if (!remove_session_lock(ctx,
531 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 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
555 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
558 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
559 SSL_SESSION_list_remove(ctx,c);
562 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
567 if (ctx->remove_session_cb != NULL)
568 ctx->remove_session_cb(ctx,r);
577 void SSL_SESSION_free(SSL_SESSION *ss)
584 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
586 REF_PRINT("SSL_SESSION",ss);
592 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
597 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
599 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
600 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
601 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
602 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
603 if (ss->peer != NULL) X509_free(ss->peer);
604 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
605 #ifndef OPENSSL_NO_TLSEXT
606 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
608 OPENSSL_cleanse(ss,sizeof(*ss));
612 int SSL_set_session(SSL *s, SSL_SESSION *session)
615 const SSL_METHOD *meth;
619 meth=s->ctx->method->get_ssl_method(session->ssl_version);
621 meth=s->method->get_ssl_method(session->ssl_version);
624 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
628 if (meth != s->method)
630 if (!SSL_set_ssl_method(s,meth))
632 if (s->ctx->session_timeout == 0)
633 session->timeout=SSL_get_default_timeout(s);
635 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)
642 s->kssl_ctx->client_princ = (char *)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);
654 s->verify_result = s->session->verify_result;
655 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
660 if (s->session != NULL)
662 SSL_SESSION_free(s->session);
667 if (meth != s->method)
669 if (!SSL_set_ssl_method(s,meth))
677 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
679 if (s == NULL) return(0);
684 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
686 if (s == NULL) return(0);
690 long SSL_SESSION_get_time(const SSL_SESSION *s)
692 if (s == NULL) return(0);
696 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
698 if (s == NULL) return(0);
703 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
706 if (s == NULL) return(0);
707 l=s->session_timeout;
708 s->session_timeout=t;
712 long SSL_CTX_get_timeout(const SSL_CTX *s)
714 if (s == NULL) return(0);
715 return(s->session_timeout);
718 typedef struct timeout_param_st
725 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
727 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
729 /* The reason we don't call SSL_CTX_remove_session() is to
730 * save on locking overhead */
731 lh_delete(p->cache,s);
732 SSL_SESSION_list_remove(p->ctx,s);
734 if (p->ctx->remove_session_cb != NULL)
735 p->ctx->remove_session_cb(p->ctx,s);
740 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
742 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
748 tp.cache=s->sessions;
749 if (tp.cache == NULL) return;
751 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
752 i=tp.cache->down_load;
753 tp.cache->down_load=0;
754 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
755 tp.cache->down_load=i;
756 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
759 int ssl_clear_bad_session(SSL *s)
761 if ( (s->session != NULL) &&
762 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
763 !(SSL_in_init(s) || SSL_in_before(s)))
765 SSL_CTX_remove_session(s->ctx,s->session);
772 /* locked by SSL_CTX in the calling function */
773 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
775 if ((s->next == NULL) || (s->prev == NULL)) return;
777 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
778 { /* last element in list */
779 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
780 { /* only one element in list */
781 ctx->session_cache_head=NULL;
782 ctx->session_cache_tail=NULL;
786 ctx->session_cache_tail=s->prev;
787 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
792 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
793 { /* first element in list */
794 ctx->session_cache_head=s->next;
795 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
798 { /* middle of list */
799 s->next->prev=s->prev;
800 s->prev->next=s->next;
803 s->prev=s->next=NULL;
806 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
808 if ((s->next != NULL) && (s->prev != NULL))
809 SSL_SESSION_list_remove(ctx,s);
811 if (ctx->session_cache_head == NULL)
813 ctx->session_cache_head=s;
814 ctx->session_cache_tail=s;
815 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
816 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
820 s->next=ctx->session_cache_head;
822 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
823 ctx->session_cache_head=s;