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 #ifndef OPENSSL_NO_TLSEXT
118 #define session_ctx initial_ctx
120 #define session_ctx ctx
123 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
124 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
125 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
127 SSL_SESSION *SSL_get_session(const SSL *ssl)
128 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
130 return(ssl->session);
133 SSL_SESSION *SSL_get1_session(SSL *ssl)
134 /* variant of SSL_get_session: caller really gets something */
137 /* Need to lock this all up rather than just use CRYPTO_add so that
138 * somebody doesn't free ssl->session between when we check it's
139 * non-null and when we up the reference count. */
140 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
144 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
148 int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
149 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
151 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
152 new_func, dup_func, free_func);
155 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
157 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
160 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
162 return(CRYPTO_get_ex_data(&s->ex_data,idx));
165 SSL_SESSION *SSL_SESSION_new(void)
169 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
172 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
175 memset(ss,0,sizeof(SSL_SESSION));
177 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
179 ss->timeout=60*5+4; /* 5 minute timeout by default */
180 ss->time=(unsigned long)time(NULL);
184 #ifndef OPENSSL_NO_TLSEXT
185 ss->tlsext_hostname = NULL;
187 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
191 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
194 *len = s->session_id_length;
195 return s->session_id;
198 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
199 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
200 * until we have no conflict is going to complete in one iteration pretty much
201 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
202 * and we still can't avoid a conflict - well that's a reasonable point to call
203 * it quits. Either the RAND code is broken or someone is trying to open roughly
204 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
205 * store that many sessions is perhaps a more interesting question ... */
207 #define MAX_SESS_ID_ATTEMPTS 10
208 static int def_generate_session_id(const SSL *ssl, unsigned char *id,
209 unsigned int *id_len)
211 unsigned int retry = 0;
213 if (RAND_pseudo_bytes(id, *id_len) <= 0)
215 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
216 (++retry < MAX_SESS_ID_ATTEMPTS));
217 if(retry < MAX_SESS_ID_ATTEMPTS)
219 /* else - woops a session_id match */
220 /* XXX We should also check the external cache --
221 * but the probability of a collision is negligible, and
222 * we could not prevent the concurrent creation of sessions
223 * with identical IDs since we currently don't have means
224 * to atomically check whether a session ID already exists
225 * and make a reservation for it if it does not
226 * (this problem applies to the internal cache as well).
231 int ssl_get_new_session(SSL *s, int session)
233 /* This gets used by clients and servers. */
236 SSL_SESSION *ss=NULL;
237 GEN_SESSION_CB cb = def_generate_session_id;
239 if ((ss=SSL_SESSION_new()) == NULL) return(0);
241 /* If the context has a default timeout, use it */
242 if (s->session_ctx->session_timeout == 0)
243 ss->timeout=SSL_get_default_timeout(s);
245 ss->timeout=s->ctx->session_timeout;
247 if (s->session != NULL)
249 SSL_SESSION_free(s->session);
255 if (s->version == SSL2_VERSION)
257 ss->ssl_version=SSL2_VERSION;
258 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
260 else if (s->version == SSL3_VERSION)
262 ss->ssl_version=SSL3_VERSION;
263 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
265 else if (s->version == TLS1_VERSION)
267 ss->ssl_version=TLS1_VERSION;
268 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
270 else if (s->version == DTLS1_VERSION)
272 ss->ssl_version=DTLS1_VERSION;
273 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
277 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
278 SSL_SESSION_free(ss);
281 /* Choose which callback will set the session ID */
282 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
283 if(s->generate_session_id)
284 cb = s->generate_session_id;
285 else if(s->session_ctx->generate_session_id)
286 cb = s->session_ctx->generate_session_id;
287 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
288 /* Choose a session ID */
289 tmp = ss->session_id_length;
290 if(!cb(s, ss->session_id, &tmp))
292 /* The callback failed */
293 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
294 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
295 SSL_SESSION_free(ss);
298 /* Don't allow the callback to set the session length to zero.
299 * nor set it higher than it was. */
300 if(!tmp || (tmp > ss->session_id_length))
302 /* The callback set an illegal length */
303 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
304 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
305 SSL_SESSION_free(ss);
308 /* If the session length was shrunk and we're SSLv2, pad it */
309 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
310 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
312 ss->session_id_length = tmp;
313 /* Finally, check for a conflict */
314 if(SSL_has_matching_session_id(s, ss->session_id,
315 ss->session_id_length))
317 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
318 SSL_R_SSL_SESSION_ID_CONFLICT);
319 SSL_SESSION_free(ss);
325 ss->session_id_length=0;
328 if (s->sid_ctx_length > sizeof ss->sid_ctx)
330 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
331 SSL_SESSION_free(ss);
334 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
335 ss->sid_ctx_length=s->sid_ctx_length;
337 ss->ssl_version=s->version;
338 ss->verify_result = X509_V_OK;
343 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len)
345 /* This is used only by servers. */
347 SSL_SESSION *ret=NULL,data;
350 data.ssl_version=s->version;
351 data.session_id_length=len;
352 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
354 memcpy(data.session_id,session_id,len);
356 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
358 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
359 ret=(SSL_SESSION *)lh_retrieve(s->session_ctx->sessions,&data);
361 /* don't allow other threads to steal it: */
362 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
363 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
370 s->session_ctx->stats.sess_miss++;
372 if (s->session_ctx->get_session_cb != NULL
373 && (ret=s->session_ctx->get_session_cb(s,session_id,len,©))
376 s->session_ctx->stats.sess_cb_hit++;
378 /* Increment reference count now if the session callback
379 * asks us to do so (note that if the session structures
380 * returned by the callback are shared between threads,
381 * it must handle the reference count itself [i.e. copy == 0],
382 * or things won't be thread-safe). */
384 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
386 /* Add the externally cached session to the internal
387 * cache as well if and only if we are supposed to. */
388 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
389 /* The following should not return 1, otherwise,
390 * things are very strange */
391 SSL_CTX_add_session(s->session_ctx,ret);
397 /* Now ret is non-NULL, and we own one of its reference counts. */
399 if((s->verify_mode&SSL_VERIFY_PEER)
400 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length
401 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)))
403 /* We've found the session named by the client, but we don't
404 * want to use it in this context. */
406 if (s->sid_ctx_length == 0)
408 /* application should have used SSL[_CTX]_set_session_id_context
409 * -- we could tolerate this and just pretend we never heard
410 * of this session, but then applications could effectively
411 * disable the session cache by accident without anyone noticing */
413 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
419 #if 0 /* The client cannot always know when a session is not appropriate,
420 * so we shouldn't generate an error message. */
422 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
424 goto err; /* treat like cache miss */
428 if (ret->cipher == NULL)
430 unsigned char buf[5],*p;
436 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
437 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
439 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
440 if (ret->cipher == NULL)
445 #if 0 /* This is way too late. */
447 /* If a thread got the session, then 'swaped', and another got
448 * it and then due to a time-out decided to 'OPENSSL_free' it we could
449 * be in trouble. So I'll increment it now, then double decrement
450 * later - am I speaking rubbish?. */
451 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
454 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
456 s->session_ctx->stats.sess_timeout++;
457 /* remove it from the cache */
458 SSL_CTX_remove_session(s->session_ctx,ret);
462 s->session_ctx->stats.sess_hit++;
464 /* ret->time=time(NULL); */ /* rezero timeout? */
465 /* again, just leave the session
466 * if it is the same session, we have just incremented and
467 * then decremented the reference count :-) */
468 if (s->session != NULL)
469 SSL_SESSION_free(s->session);
471 s->verify_result = s->session->verify_result;
476 SSL_SESSION_free(ret);
483 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
488 /* add just 1 reference count for the SSL_CTX's session cache
489 * even though it has two ways of access: each session is in a
490 * doubly linked list and an lhash */
491 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
492 /* if session c is in already in cache, we take back the increment later */
494 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
495 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
497 /* s != NULL iff we already had a session with the given PID.
498 * In this case, s == c should hold (then we did not really modify
499 * ctx->sessions), or we're in trouble. */
500 if (s != NULL && s != c)
502 /* We *are* in trouble ... */
503 SSL_SESSION_list_remove(ctx,s);
505 /* ... so pretend the other session did not exist in cache
506 * (we cannot handle two SSL_SESSION structures with identical
507 * session ID in the same cache, which could happen e.g. when
508 * two threads concurrently obtain the same session from an external
513 /* Put at the head of the queue unless it is already in the cache */
515 SSL_SESSION_list_add(ctx,c);
519 /* existing cache entry -- decrement previously incremented reference
520 * count because it already takes into account the cache */
522 SSL_SESSION_free(s); /* s == c */
527 /* new cache entry -- remove old ones if cache has become too large */
531 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
533 while (SSL_CTX_sess_number(ctx) >
534 SSL_CTX_sess_get_cache_size(ctx))
536 if (!remove_session_lock(ctx,
537 ctx->session_cache_tail, 0))
540 ctx->stats.sess_cache_full++;
544 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
548 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
550 return remove_session_lock(ctx, c, 1);
553 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
558 if ((c != NULL) && (c->session_id_length != 0))
560 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
561 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
564 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
565 SSL_SESSION_list_remove(ctx,c);
568 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
573 if (ctx->remove_session_cb != NULL)
574 ctx->remove_session_cb(ctx,r);
583 void SSL_SESSION_free(SSL_SESSION *ss)
590 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
592 REF_PRINT("SSL_SESSION",ss);
598 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
603 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
605 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
606 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
607 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
608 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
609 if (ss->peer != NULL) X509_free(ss->peer);
610 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
611 #ifndef OPENSSL_NO_TLSEXT
612 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
614 OPENSSL_cleanse(ss,sizeof(*ss));
618 int SSL_set_session(SSL *s, SSL_SESSION *session)
621 const SSL_METHOD *meth;
625 meth=s->ctx->method->get_ssl_method(session->ssl_version);
627 meth=s->method->get_ssl_method(session->ssl_version);
630 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
634 if (meth != s->method)
636 if (!SSL_set_ssl_method(s,meth))
638 if (s->ctx->session_timeout == 0)
639 session->timeout=SSL_get_default_timeout(s);
641 session->timeout=s->ctx->session_timeout;
644 #ifndef OPENSSL_NO_KRB5
645 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
646 session->krb5_client_princ_len > 0)
648 s->kssl_ctx->client_princ = (char *)malloc(session->krb5_client_princ_len + 1);
649 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
650 session->krb5_client_princ_len);
651 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
653 #endif /* OPENSSL_NO_KRB5 */
655 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
656 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
657 if (s->session != NULL)
658 SSL_SESSION_free(s->session);
660 s->verify_result = s->session->verify_result;
661 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
666 if (s->session != NULL)
668 SSL_SESSION_free(s->session);
673 if (meth != s->method)
675 if (!SSL_set_ssl_method(s,meth))
683 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
685 if (s == NULL) return(0);
690 long SSL_SESSION_get_timeout(const SSL_SESSION *s)
692 if (s == NULL) return(0);
696 long SSL_SESSION_get_time(const SSL_SESSION *s)
698 if (s == NULL) return(0);
702 long SSL_SESSION_set_time(SSL_SESSION *s, long t)
704 if (s == NULL) return(0);
709 long SSL_CTX_set_timeout(SSL_CTX *s, long t)
712 if (s == NULL) return(0);
713 l=s->session_timeout;
714 s->session_timeout=t;
718 long SSL_CTX_get_timeout(const SSL_CTX *s)
720 if (s == NULL) return(0);
721 return(s->session_timeout);
724 typedef struct timeout_param_st
731 static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
733 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
735 /* The reason we don't call SSL_CTX_remove_session() is to
736 * save on locking overhead */
737 lh_delete(p->cache,s);
738 SSL_SESSION_list_remove(p->ctx,s);
740 if (p->ctx->remove_session_cb != NULL)
741 p->ctx->remove_session_cb(p->ctx,s);
746 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
748 void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
754 tp.cache=s->sessions;
755 if (tp.cache == NULL) return;
757 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
758 i=tp.cache->down_load;
759 tp.cache->down_load=0;
760 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
761 tp.cache->down_load=i;
762 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
765 int ssl_clear_bad_session(SSL *s)
767 if ( (s->session != NULL) &&
768 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
769 !(SSL_in_init(s) || SSL_in_before(s)))
771 SSL_CTX_remove_session(s->ctx,s->session);
778 /* locked by SSL_CTX in the calling function */
779 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
781 if ((s->next == NULL) || (s->prev == NULL)) return;
783 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
784 { /* last element in list */
785 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
786 { /* only one element in list */
787 ctx->session_cache_head=NULL;
788 ctx->session_cache_tail=NULL;
792 ctx->session_cache_tail=s->prev;
793 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
798 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
799 { /* first element in list */
800 ctx->session_cache_head=s->next;
801 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
804 { /* middle of list */
805 s->next->prev=s->prev;
806 s->prev->next=s->next;
809 s->prev=s->next=NULL;
812 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
814 if ((s->next != NULL) && (s->prev != NULL))
815 SSL_SESSION_list_remove(ctx,s);
817 if (ctx->session_cache_head == NULL)
819 ctx->session_cache_head=s;
820 ctx->session_cache_tail=s;
821 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
822 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
826 s->next=ctx->session_cache_head;
828 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
829 ctx->session_cache_head=s;