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(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(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 */
125 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION
, ss
, &ss
->ex_data
);
129 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
130 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
131 * until we have no conflict is going to complete in one iteration pretty much
132 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
133 * and we still can't avoid a conflict - well that's a reasonable point to call
134 * it quits. Either the RAND code is broken or someone is trying to open roughly
135 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
136 * store that many sessions is perhaps a more interesting question ... */
138 #define MAX_SESS_ID_ATTEMPTS 10
139 static int def_generate_session_id(const SSL
*ssl
, unsigned char *id
,
140 unsigned int *id_len
)
142 unsigned int retry
= 0;
144 RAND_pseudo_bytes(id
, *id_len
);
145 while(SSL_has_matching_session_id(ssl
, id
, *id_len
) &&
146 (++retry
< MAX_SESS_ID_ATTEMPTS
));
147 if(retry
< MAX_SESS_ID_ATTEMPTS
)
149 /* else - woops a session_id match */
150 /* XXX We should also check the external cache --
151 * but the probability of a collision is negligible, and
152 * we could not prevent the concurrent creation of sessions
153 * with identical IDs since we currently don't have means
154 * to atomically check whether a session ID already exists
155 * and make a reservation for it if it does not
156 * (this problem applies to the internal cache as well).
161 int ssl_get_new_session(SSL
*s
, int session
)
163 /* This gets used by clients and servers. */
166 SSL_SESSION
*ss
=NULL
;
167 GEN_SESSION_CB cb
= def_generate_session_id
;
169 if ((ss
=SSL_SESSION_new()) == NULL
) return(0);
171 /* If the context has a default timeout, use it */
172 if (s
->ctx
->session_timeout
== 0)
173 ss
->timeout
=SSL_get_default_timeout(s
);
175 ss
->timeout
=s
->ctx
->session_timeout
;
177 if (s
->session
!= NULL
)
179 SSL_SESSION_free(s
->session
);
185 if (s
->version
== SSL2_VERSION
)
187 ss
->ssl_version
=SSL2_VERSION
;
188 ss
->session_id_length
=SSL2_SSL_SESSION_ID_LENGTH
;
190 else if (s
->version
== SSL3_VERSION
)
192 ss
->ssl_version
=SSL3_VERSION
;
193 ss
->session_id_length
=SSL3_SSL_SESSION_ID_LENGTH
;
195 else if (s
->version
== TLS1_VERSION
)
197 ss
->ssl_version
=TLS1_VERSION
;
198 ss
->session_id_length
=SSL3_SSL_SESSION_ID_LENGTH
;
202 SSLerr(SSL_F_SSL_GET_NEW_SESSION
,SSL_R_UNSUPPORTED_SSL_VERSION
);
203 SSL_SESSION_free(ss
);
206 /* Choose which callback will set the session ID */
207 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX
);
208 if(s
->generate_session_id
)
209 cb
= s
->generate_session_id
;
210 else if(s
->ctx
->generate_session_id
)
211 cb
= s
->ctx
->generate_session_id
;
212 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX
);
213 /* Choose a session ID */
214 tmp
= ss
->session_id_length
;
215 if(!cb(s
, ss
->session_id
, &tmp
))
217 /* The callback failed */
218 SSLerr(SSL_F_SSL_GET_NEW_SESSION
,
219 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED
);
220 SSL_SESSION_free(ss
);
223 /* Don't allow the callback to set the session length to zero.
224 * nor set it higher than it was. */
225 if(!tmp
|| (tmp
> ss
->session_id_length
))
227 /* The callback set an illegal length */
228 SSLerr(SSL_F_SSL_GET_NEW_SESSION
,
229 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH
);
230 SSL_SESSION_free(ss
);
233 /* If the session length was shrunk and we're SSLv2, pad it */
234 if((tmp
< ss
->session_id_length
) && (s
->version
== SSL2_VERSION
))
235 memset(ss
->session_id
+ tmp
, 0, ss
->session_id_length
- tmp
);
237 ss
->session_id_length
= tmp
;
238 /* Finally, check for a conflict */
239 if(SSL_has_matching_session_id(s
, ss
->session_id
,
240 ss
->session_id_length
))
242 SSLerr(SSL_F_SSL_GET_NEW_SESSION
,
243 SSL_R_SSL_SESSION_ID_CONFLICT
);
244 SSL_SESSION_free(ss
);
250 ss
->session_id_length
=0;
253 if (s
->sid_ctx_length
> sizeof ss
->sid_ctx
)
255 SSLerr(SSL_F_SSL_GET_NEW_SESSION
, ERR_R_INTERNAL_ERROR
);
256 SSL_SESSION_free(ss
);
259 memcpy(ss
->sid_ctx
,s
->sid_ctx
,s
->sid_ctx_length
);
260 ss
->sid_ctx_length
=s
->sid_ctx_length
;
262 ss
->ssl_version
=s
->version
;
263 ss
->verify_result
= X509_V_OK
;
268 int ssl_get_prev_session(SSL
*s
, unsigned char *session_id
, int len
)
270 /* This is used only by servers. */
272 SSL_SESSION
*ret
=NULL
,data
;
275 data
.ssl_version
=s
->version
;
276 data
.session_id_length
=len
;
277 if (len
> SSL_MAX_SSL_SESSION_ID_LENGTH
)
279 memcpy(data
.session_id
,session_id
,len
);
281 if (!(s
->ctx
->session_cache_mode
& SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
))
283 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX
);
284 ret
=(SSL_SESSION
*)lh_retrieve(s
->ctx
->sessions
,&data
);
286 /* don't allow other threads to steal it: */
287 CRYPTO_add(&ret
->references
,1,CRYPTO_LOCK_SSL_SESSION
);
288 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX
);
295 s
->ctx
->stats
.sess_miss
++;
297 if (s
->ctx
->get_session_cb
!= NULL
298 && (ret
=s
->ctx
->get_session_cb(s
,session_id
,len
,©
))
301 s
->ctx
->stats
.sess_cb_hit
++;
303 /* Increment reference count now if the session callback
304 * asks us to do so (note that if the session structures
305 * returned by the callback are shared between threads,
306 * it must handle the reference count itself [i.e. copy == 0],
307 * or things won't be thread-safe). */
309 CRYPTO_add(&ret
->references
,1,CRYPTO_LOCK_SSL_SESSION
);
311 /* Add the externally cached session to the internal
312 * cache as well if and only if we are supposed to. */
313 if(!(s
->ctx
->session_cache_mode
& SSL_SESS_CACHE_NO_INTERNAL_STORE
))
314 /* The following should not return 1, otherwise,
315 * things are very strange */
316 SSL_CTX_add_session(s
->ctx
,ret
);
322 /* Now ret is non-NULL, and we own one of its reference counts. */
324 if((s
->verify_mode
&SSL_VERIFY_PEER
)
325 && (!s
->sid_ctx_length
|| ret
->sid_ctx_length
!= s
->sid_ctx_length
326 || memcmp(ret
->sid_ctx
,s
->sid_ctx
,ret
->sid_ctx_length
)))
328 /* We've found the session named by the client, but we don't
329 * want to use it in this context. */
331 if (s
->sid_ctx_length
== 0)
333 /* application should have used SSL[_CTX]_set_session_id_context
334 * -- we could tolerate this and just pretend we never heard
335 * of this session, but then applications could effectively
336 * disable the session cache by accident without anyone noticing */
338 SSLerr(SSL_F_SSL_GET_PREV_SESSION
,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED
);
344 #if 0 /* The client cannot always know when a session is not appropriate,
345 * so we shouldn't generate an error message. */
347 SSLerr(SSL_F_SSL_GET_PREV_SESSION
,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT
);
349 goto err
; /* treat like cache miss */
353 if (ret
->cipher
== NULL
)
355 unsigned char buf
[5],*p
;
361 if ((ret
->ssl_version
>>8) == SSL3_VERSION_MAJOR
)
362 ret
->cipher
=ssl_get_cipher_by_char(s
,&(buf
[2]));
364 ret
->cipher
=ssl_get_cipher_by_char(s
,&(buf
[1]));
365 if (ret
->cipher
== NULL
)
370 #if 0 /* This is way too late. */
372 /* If a thread got the session, then 'swaped', and another got
373 * it and then due to a time-out decided to 'OPENSSL_free' it we could
374 * be in trouble. So I'll increment it now, then double decrement
375 * later - am I speaking rubbish?. */
376 CRYPTO_add(&ret
->references
,1,CRYPTO_LOCK_SSL_SESSION
);
379 if ((long)(ret
->time
+ret
->timeout
) < (long)time(NULL
)) /* timeout */
381 s
->ctx
->stats
.sess_timeout
++;
382 /* remove it from the cache */
383 SSL_CTX_remove_session(s
->ctx
,ret
);
387 s
->ctx
->stats
.sess_hit
++;
389 /* ret->time=time(NULL); */ /* rezero timeout? */
390 /* again, just leave the session
391 * if it is the same session, we have just incremented and
392 * then decremented the reference count :-) */
393 if (s
->session
!= NULL
)
394 SSL_SESSION_free(s
->session
);
396 s
->verify_result
= s
->session
->verify_result
;
401 SSL_SESSION_free(ret
);
408 int SSL_CTX_add_session(SSL_CTX
*ctx
, SSL_SESSION
*c
)
413 /* add just 1 reference count for the SSL_CTX's session cache
414 * even though it has two ways of access: each session is in a
415 * doubly linked list and an lhash */
416 CRYPTO_add(&c
->references
,1,CRYPTO_LOCK_SSL_SESSION
);
417 /* if session c is in already in cache, we take back the increment later */
419 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX
);
420 s
=(SSL_SESSION
*)lh_insert(ctx
->sessions
,c
);
422 /* s != NULL iff we already had a session with the given PID.
423 * In this case, s == c should hold (then we did not really modify
424 * ctx->sessions), or we're in trouble. */
425 if (s
!= NULL
&& s
!= c
)
427 /* We *are* in trouble ... */
428 SSL_SESSION_list_remove(ctx
,s
);
430 /* ... so pretend the other session did not exist in cache
431 * (we cannot handle two SSL_SESSION structures with identical
432 * session ID in the same cache, which could happen e.g. when
433 * two threads concurrently obtain the same session from an external
438 /* Put at the head of the queue unless it is already in the cache */
440 SSL_SESSION_list_add(ctx
,c
);
444 /* existing cache entry -- decrement previously incremented reference
445 * count because it already takes into account the cache */
447 SSL_SESSION_free(s
); /* s == c */
452 /* new cache entry -- remove old ones if cache has become too large */
456 if (SSL_CTX_sess_get_cache_size(ctx
) > 0)
458 while (SSL_CTX_sess_number(ctx
) >
459 SSL_CTX_sess_get_cache_size(ctx
))
461 if (!remove_session_lock(ctx
,
462 ctx
->session_cache_tail
, 0))
465 ctx
->stats
.sess_cache_full
++;
469 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX
);
473 int SSL_CTX_remove_session(SSL_CTX
*ctx
, SSL_SESSION
*c
)
475 return remove_session_lock(ctx
, c
, 1);
478 static int remove_session_lock(SSL_CTX
*ctx
, SSL_SESSION
*c
, int lck
)
483 if ((c
!= NULL
) && (c
->session_id_length
!= 0))
485 if(lck
) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX
);
486 if ((r
= (SSL_SESSION
*)lh_retrieve(ctx
->sessions
,c
)) == c
)
489 r
=(SSL_SESSION
*)lh_delete(ctx
->sessions
,c
);
490 SSL_SESSION_list_remove(ctx
,c
);
493 if(lck
) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX
);
498 if (ctx
->remove_session_cb
!= NULL
)
499 ctx
->remove_session_cb(ctx
,r
);
508 void SSL_SESSION_free(SSL_SESSION
*ss
)
515 i
=CRYPTO_add(&ss
->references
,-1,CRYPTO_LOCK_SSL_SESSION
);
517 REF_PRINT("SSL_SESSION",ss
);
523 fprintf(stderr
,"SSL_SESSION_free, bad reference count\n");
528 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION
, ss
, &ss
->ex_data
);
530 OPENSSL_cleanse(ss
->key_arg
,sizeof ss
->key_arg
);
531 OPENSSL_cleanse(ss
->master_key
,sizeof ss
->master_key
);
532 OPENSSL_cleanse(ss
->session_id
,sizeof ss
->session_id
);
533 if (ss
->sess_cert
!= NULL
) ssl_sess_cert_free(ss
->sess_cert
);
534 if (ss
->peer
!= NULL
) X509_free(ss
->peer
);
535 if (ss
->ciphers
!= NULL
) sk_SSL_CIPHER_free(ss
->ciphers
);
536 OPENSSL_cleanse(ss
,sizeof(*ss
));
540 int SSL_set_session(SSL
*s
, SSL_SESSION
*session
)
547 meth
=s
->ctx
->method
->get_ssl_method(session
->ssl_version
);
549 meth
=s
->method
->get_ssl_method(session
->ssl_version
);
552 SSLerr(SSL_F_SSL_SET_SESSION
,SSL_R_UNABLE_TO_FIND_SSL_METHOD
);
556 if (meth
!= s
->method
)
558 if (!SSL_set_ssl_method(s
,meth
))
560 if (s
->ctx
->session_timeout
== 0)
561 session
->timeout
=SSL_get_default_timeout(s
);
563 session
->timeout
=s
->ctx
->session_timeout
;
566 #ifndef OPENSSL_NO_KRB5
567 if (s
->kssl_ctx
&& !s
->kssl_ctx
->client_princ
&&
568 session
->krb5_client_princ_len
> 0)
570 s
->kssl_ctx
->client_princ
= (char *)malloc(session
->krb5_client_princ_len
+ 1);
571 memcpy(s
->kssl_ctx
->client_princ
,session
->krb5_client_princ
,
572 session
->krb5_client_princ_len
);
573 s
->kssl_ctx
->client_princ
[session
->krb5_client_princ_len
] = '\0';
575 #endif /* OPENSSL_NO_KRB5 */
577 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
578 CRYPTO_add(&session
->references
,1,CRYPTO_LOCK_SSL_SESSION
);
579 if (s
->session
!= NULL
)
580 SSL_SESSION_free(s
->session
);
582 s
->verify_result
= s
->session
->verify_result
;
583 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
588 if (s
->session
!= NULL
)
590 SSL_SESSION_free(s
->session
);
595 if (meth
!= s
->method
)
597 if (!SSL_set_ssl_method(s
,meth
))
605 long SSL_SESSION_set_timeout(SSL_SESSION
*s
, long t
)
607 if (s
== NULL
) return(0);
612 long SSL_SESSION_get_timeout(SSL_SESSION
*s
)
614 if (s
== NULL
) return(0);
618 long SSL_SESSION_get_time(SSL_SESSION
*s
)
620 if (s
== NULL
) return(0);
624 long SSL_SESSION_set_time(SSL_SESSION
*s
, long t
)
626 if (s
== NULL
) return(0);
631 long SSL_CTX_set_timeout(SSL_CTX
*s
, long t
)
634 if (s
== NULL
) return(0);
635 l
=s
->session_timeout
;
636 s
->session_timeout
=t
;
640 long SSL_CTX_get_timeout(SSL_CTX
*s
)
642 if (s
== NULL
) return(0);
643 return(s
->session_timeout
);
646 typedef struct timeout_param_st
653 static void timeout(SSL_SESSION
*s
, TIMEOUT_PARAM
*p
)
655 if ((p
->time
== 0) || (p
->time
> (s
->time
+s
->timeout
))) /* timeout */
657 /* The reason we don't call SSL_CTX_remove_session() is to
658 * save on locking overhead */
659 lh_delete(p
->cache
,s
);
660 SSL_SESSION_list_remove(p
->ctx
,s
);
662 if (p
->ctx
->remove_session_cb
!= NULL
)
663 p
->ctx
->remove_session_cb(p
->ctx
,s
);
668 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout
, SSL_SESSION
*, TIMEOUT_PARAM
*)
670 void SSL_CTX_flush_sessions(SSL_CTX
*s
, long t
)
676 tp
.cache
=s
->sessions
;
677 if (tp
.cache
== NULL
) return;
679 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX
);
680 i
=tp
.cache
->down_load
;
681 tp
.cache
->down_load
=0;
682 lh_doall_arg(tp
.cache
, LHASH_DOALL_ARG_FN(timeout
), &tp
);
683 tp
.cache
->down_load
=i
;
684 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX
);
687 int ssl_clear_bad_session(SSL
*s
)
689 if ( (s
->session
!= NULL
) &&
690 !(s
->shutdown
& SSL_SENT_SHUTDOWN
) &&
691 !(SSL_in_init(s
) || SSL_in_before(s
)))
693 SSL_CTX_remove_session(s
->ctx
,s
->session
);
700 /* locked by SSL_CTX in the calling function */
701 static void SSL_SESSION_list_remove(SSL_CTX
*ctx
, SSL_SESSION
*s
)
703 if ((s
->next
== NULL
) || (s
->prev
== NULL
)) return;
705 if (s
->next
== (SSL_SESSION
*)&(ctx
->session_cache_tail
))
706 { /* last element in list */
707 if (s
->prev
== (SSL_SESSION
*)&(ctx
->session_cache_head
))
708 { /* only one element in list */
709 ctx
->session_cache_head
=NULL
;
710 ctx
->session_cache_tail
=NULL
;
714 ctx
->session_cache_tail
=s
->prev
;
715 s
->prev
->next
=(SSL_SESSION
*)&(ctx
->session_cache_tail
);
720 if (s
->prev
== (SSL_SESSION
*)&(ctx
->session_cache_head
))
721 { /* first element in list */
722 ctx
->session_cache_head
=s
->next
;
723 s
->next
->prev
=(SSL_SESSION
*)&(ctx
->session_cache_head
);
726 { /* middle of list */
727 s
->next
->prev
=s
->prev
;
728 s
->prev
->next
=s
->next
;
731 s
->prev
=s
->next
=NULL
;
734 static void SSL_SESSION_list_add(SSL_CTX
*ctx
, SSL_SESSION
*s
)
736 if ((s
->next
!= NULL
) && (s
->prev
!= NULL
))
737 SSL_SESSION_list_remove(ctx
,s
);
739 if (ctx
->session_cache_head
== NULL
)
741 ctx
->session_cache_head
=s
;
742 ctx
->session_cache_tail
=s
;
743 s
->prev
=(SSL_SESSION
*)&(ctx
->session_cache_head
);
744 s
->next
=(SSL_SESSION
*)&(ctx
->session_cache_tail
);
748 s
->next
=ctx
->session_cache_head
;
750 s
->prev
=(SSL_SESSION
*)&(ctx
->session_cache_head
);
751 ctx
->session_cache_head
=s
;