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-rw-r--r--src/lib/libssl/ssl_sess.c680
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diff --git a/src/lib/libssl/ssl_sess.c b/src/lib/libssl/ssl_sess.c
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--- a/src/lib/libssl/ssl_sess.c
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1/* ssl/ssl_sess.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include <openssl/lhash.h>
61#include <openssl/rand.h>
62#include "ssl_locl.h"
63
64static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
65static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
66static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
67static int ssl_session_num=0;
68static STACK_OF(CRYPTO_EX_DATA_FUNCS) *ssl_session_meth=NULL;
69
70SSL_SESSION *SSL_get_session(SSL *ssl)
71/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
72 {
73 return(ssl->session);
74 }
75
76SSL_SESSION *SSL_get1_session(SSL *ssl)
77/* variant of SSL_get_session: caller really gets something */
78 {
79 SSL_SESSION *sess;
80 /* Need to lock this all up rather than just use CRYPTO_add so that
81 * somebody doesn't free ssl->session between when we check it's
82 * non-null and when we up the reference count. */
83 CRYPTO_r_lock(CRYPTO_LOCK_SSL_SESSION);
84 sess = ssl->session;
85 if(sess)
86 sess->references++;
87 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_SESSION);
88 return(sess);
89 }
90
91int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
92 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
93 {
94 ssl_session_num++;
95 return(CRYPTO_get_ex_new_index(ssl_session_num-1,
96 &ssl_session_meth,
97 argl,argp,new_func,dup_func,free_func));
98 }
99
100int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
101 {
102 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
103 }
104
105void *SSL_SESSION_get_ex_data(SSL_SESSION *s, int idx)
106 {
107 return(CRYPTO_get_ex_data(&s->ex_data,idx));
108 }
109
110SSL_SESSION *SSL_SESSION_new(void)
111 {
112 SSL_SESSION *ss;
113
114 ss=(SSL_SESSION *)Malloc(sizeof(SSL_SESSION));
115 if (ss == NULL)
116 {
117 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
118 return(0);
119 }
120 memset(ss,0,sizeof(SSL_SESSION));
121
122 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
123 ss->references=1;
124 ss->timeout=60*5+4; /* 5 minute timeout by default */
125 ss->time=time(NULL);
126 ss->prev=NULL;
127 ss->next=NULL;
128 ss->compress_meth=0;
129 CRYPTO_new_ex_data(ssl_session_meth,ss,&ss->ex_data);
130 return(ss);
131 }
132
133int ssl_get_new_session(SSL *s, int session)
134 {
135 /* This gets used by clients and servers. */
136
137 SSL_SESSION *ss=NULL;
138
139 if ((ss=SSL_SESSION_new()) == NULL) return(0);
140
141 /* If the context has a default timeout, use it */
142 if (s->ctx->session_timeout == 0)
143 ss->timeout=SSL_get_default_timeout(s);
144 else
145 ss->timeout=s->ctx->session_timeout;
146
147 if (s->session != NULL)
148 {
149 SSL_SESSION_free(s->session);
150 s->session=NULL;
151 }
152
153 if (session)
154 {
155 if (s->version == SSL2_VERSION)
156 {
157 ss->ssl_version=SSL2_VERSION;
158 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
159 }
160 else if (s->version == SSL3_VERSION)
161 {
162 ss->ssl_version=SSL3_VERSION;
163 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
164 }
165 else if (s->version == TLS1_VERSION)
166 {
167 ss->ssl_version=TLS1_VERSION;
168 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
169 }
170 else
171 {
172 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
173 SSL_SESSION_free(ss);
174 return(0);
175 }
176
177 for (;;)
178 {
179 SSL_SESSION *r;
180
181 RAND_pseudo_bytes(ss->session_id,ss->session_id_length);
182 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
183 r=(SSL_SESSION *)lh_retrieve(s->ctx->sessions, ss);
184 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
185 if (r == NULL) break;
186 /* else - woops a session_id match */
187 /* XXX We should also check the external cache --
188 * but the probability of a collision is negligible, and
189 * we could not prevent the concurrent creation of sessions
190 * with identical IDs since we currently don't have means
191 * to atomically check whether a session ID already exists
192 * and make a reservation for it if it does not
193 * (this problem applies to the internal cache as well).
194 */
195 }
196 }
197 else
198 {
199 ss->session_id_length=0;
200 }
201
202 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
203 ss->sid_ctx_length=s->sid_ctx_length;
204 s->session=ss;
205 ss->ssl_version=s->version;
206 ss->verify_result = X509_V_OK;
207
208 return(1);
209 }
210
211int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len)
212 {
213 /* This is used only by servers. */
214
215 SSL_SESSION *ret=NULL,data;
216 int fatal = 0;
217
218 data.ssl_version=s->version;
219 data.session_id_length=len;
220 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
221 goto err;
222 memcpy(data.session_id,session_id,len);
223
224 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
225 {
226 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
227 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
228 if (ret != NULL)
229 /* don't allow other threads to steal it: */
230 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
231 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
232 }
233
234 if (ret == NULL)
235 {
236 int copy=1;
237
238 s->ctx->stats.sess_miss++;
239 ret=NULL;
240 if (s->ctx->get_session_cb != NULL
241 && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))
242 != NULL)
243 {
244 s->ctx->stats.sess_cb_hit++;
245
246 /* Increment reference count now if the session callback
247 * asks us to do so (note that if the session structures
248 * returned by the callback are shared between threads,
249 * it must handle the reference count itself [i.e. copy == 0],
250 * or things won't be thread-safe). */
251 if (copy)
252 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
253
254 /* The following should not return 1, otherwise,
255 * things are very strange */
256 SSL_CTX_add_session(s->ctx,ret);
257 }
258 if (ret == NULL)
259 goto err;
260 }
261
262 /* Now ret is non-NULL, and we own one of its reference counts. */
263
264 if((s->verify_mode&SSL_VERIFY_PEER)
265 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length
266 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)))
267 {
268 /* We've found the session named by the client, but we don't
269 * want to use it in this context. */
270
271 if (s->sid_ctx_length == 0)
272 {
273 /* application should have used SSL[_CTX]_set_session_id_context
274 * -- we could tolerate this and just pretend we never heard
275 * of this session, but then applications could effectively
276 * disable the session cache by accident without anyone noticing */
277
278 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
279 fatal = 1;
280 goto err;
281 }
282 else
283 {
284#if 0 /* The client cannot always know when a session is not appropriate,
285 * so we shouldn't generate an error message. */
286
287 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
288#endif
289 goto err; /* treat like cache miss */
290 }
291 }
292
293 if (ret->cipher == NULL)
294 {
295 unsigned char buf[5],*p;
296 unsigned long l;
297
298 p=buf;
299 l=ret->cipher_id;
300 l2n(l,p);
301 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
302 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
303 else
304 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
305 if (ret->cipher == NULL)
306 goto err;
307 }
308
309
310#if 0 /* This is way too late. */
311
312 /* If a thread got the session, then 'swaped', and another got
313 * it and then due to a time-out decided to 'Free' it we could
314 * be in trouble. So I'll increment it now, then double decrement
315 * later - am I speaking rubbish?. */
316 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
317#endif
318
319 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
320 {
321 s->ctx->stats.sess_timeout++;
322 /* remove it from the cache */
323 SSL_CTX_remove_session(s->ctx,ret);
324 goto err;
325 }
326
327 s->ctx->stats.sess_hit++;
328
329 /* ret->time=time(NULL); */ /* rezero timeout? */
330 /* again, just leave the session
331 * if it is the same session, we have just incremented and
332 * then decremented the reference count :-) */
333 if (s->session != NULL)
334 SSL_SESSION_free(s->session);
335 s->session=ret;
336 s->verify_result = s->session->verify_result;
337 return(1);
338
339 err:
340 if (ret != NULL)
341 SSL_SESSION_free(ret);
342 if (fatal)
343 return -1;
344 else
345 return 0;
346 }
347
348int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
349 {
350 int ret=0;
351 SSL_SESSION *s;
352
353 /* add just 1 reference count for the SSL_CTX's session cache
354 * even though it has two ways of access: each session is in a
355 * doubly linked list and an lhash */
356 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
357 /* if session c is in already in cache, we take back the increment later */
358
359 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
360 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
361
362 /* s != NULL iff we already had a session with the given PID.
363 * In this case, s == c should hold (then we did not really modify
364 * ctx->sessions), or we're in trouble. */
365 if (s != NULL && s != c)
366 {
367 /* We *are* in trouble ... */
368 SSL_SESSION_list_remove(ctx,s);
369 SSL_SESSION_free(s);
370 /* ... so pretend the other session did not exist in cache
371 * (we cannot handle two SSL_SESSION structures with identical
372 * session ID in the same cache, which could happen e.g. when
373 * two threads concurrently obtain the same session from an external
374 * cache) */
375 s = NULL;
376 }
377
378 /* Put at the head of the queue unless it is already in the cache */
379 if (s == NULL)
380 SSL_SESSION_list_add(ctx,c);
381
382 if (s != NULL)
383 {
384 /* existing cache entry -- decrement previously incremented reference
385 * count because it already takes into account the cache */
386
387 SSL_SESSION_free(s); /* s == c */
388 ret=0;
389 }
390 else
391 {
392 /* new cache entry -- remove old ones if cache has become too large */
393
394 ret=1;
395
396 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
397 {
398 while (SSL_CTX_sess_number(ctx) >
399 SSL_CTX_sess_get_cache_size(ctx))
400 {
401 if (!remove_session_lock(ctx,
402 ctx->session_cache_tail, 0))
403 break;
404 else
405 ctx->stats.sess_cache_full++;
406 }
407 }
408 }
409 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
410 return(ret);
411 }
412
413int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
414{
415 return remove_session_lock(ctx, c, 1);
416}
417
418static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
419 {
420 SSL_SESSION *r;
421 int ret=0;
422
423 if ((c != NULL) && (c->session_id_length != 0))
424 {
425 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
426 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
427 if (r != NULL)
428 {
429 ret=1;
430 SSL_SESSION_list_remove(ctx,c);
431 }
432
433 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
434
435 if (ret)
436 {
437 r->not_resumable=1;
438 if (ctx->remove_session_cb != NULL)
439 ctx->remove_session_cb(ctx,r);
440 SSL_SESSION_free(r);
441 }
442 }
443 else
444 ret=0;
445 return(ret);
446 }
447
448void SSL_SESSION_free(SSL_SESSION *ss)
449 {
450 int i;
451
452 if(ss == NULL)
453 return;
454
455 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
456#ifdef REF_PRINT
457 REF_PRINT("SSL_SESSION",ss);
458#endif
459 if (i > 0) return;
460#ifdef REF_CHECK
461 if (i < 0)
462 {
463 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
464 abort(); /* ok */
465 }
466#endif
467
468 CRYPTO_free_ex_data(ssl_session_meth,ss,&ss->ex_data);
469
470 memset(ss->key_arg,0,SSL_MAX_KEY_ARG_LENGTH);
471 memset(ss->master_key,0,SSL_MAX_MASTER_KEY_LENGTH);
472 memset(ss->session_id,0,SSL_MAX_SSL_SESSION_ID_LENGTH);
473 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
474 if (ss->peer != NULL) X509_free(ss->peer);
475 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
476 memset(ss,0,sizeof(*ss));
477 Free(ss);
478 }
479
480int SSL_set_session(SSL *s, SSL_SESSION *session)
481 {
482 int ret=0;
483 SSL_METHOD *meth;
484
485 if (session != NULL)
486 {
487 meth=s->ctx->method->get_ssl_method(session->ssl_version);
488 if (meth == NULL)
489 meth=s->method->get_ssl_method(session->ssl_version);
490 if (meth == NULL)
491 {
492 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
493 return(0);
494 }
495
496 if (meth != s->method)
497 {
498 if (!SSL_set_ssl_method(s,meth))
499 return(0);
500 if (s->ctx->session_timeout == 0)
501 session->timeout=SSL_get_default_timeout(s);
502 else
503 session->timeout=s->ctx->session_timeout;
504 }
505
506 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
507 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
508 if (s->session != NULL)
509 SSL_SESSION_free(s->session);
510 s->session=session;
511 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
512 ret=1;
513 }
514 else
515 {
516 if (s->session != NULL)
517 {
518 SSL_SESSION_free(s->session);
519 s->session=NULL;
520 }
521
522 meth=s->ctx->method;
523 if (meth != s->method)
524 {
525 if (!SSL_set_ssl_method(s,meth))
526 return(0);
527 }
528 ret=1;
529 }
530 return(ret);
531 }
532
533long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
534 {
535 if (s == NULL) return(0);
536 s->timeout=t;
537 return(1);
538 }
539
540long SSL_SESSION_get_timeout(SSL_SESSION *s)
541 {
542 if (s == NULL) return(0);
543 return(s->timeout);
544 }
545
546long SSL_SESSION_get_time(SSL_SESSION *s)
547 {
548 if (s == NULL) return(0);
549 return(s->time);
550 }
551
552long SSL_SESSION_set_time(SSL_SESSION *s, long t)
553 {
554 if (s == NULL) return(0);
555 s->time=t;
556 return(t);
557 }
558
559long SSL_CTX_set_timeout(SSL_CTX *s, long t)
560 {
561 long l;
562 if (s == NULL) return(0);
563 l=s->session_timeout;
564 s->session_timeout=t;
565 return(l);
566 }
567
568long SSL_CTX_get_timeout(SSL_CTX *s)
569 {
570 if (s == NULL) return(0);
571 return(s->session_timeout);
572 }
573
574typedef struct timeout_param_st
575 {
576 SSL_CTX *ctx;
577 long time;
578 LHASH *cache;
579 } TIMEOUT_PARAM;
580
581static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
582 {
583 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
584 {
585 /* The reason we don't call SSL_CTX_remove_session() is to
586 * save on locking overhead */
587 lh_delete(p->cache,s);
588 SSL_SESSION_list_remove(p->ctx,s);
589 s->not_resumable=1;
590 if (p->ctx->remove_session_cb != NULL)
591 p->ctx->remove_session_cb(p->ctx,s);
592 SSL_SESSION_free(s);
593 }
594 }
595
596void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
597 {
598 unsigned long i;
599 TIMEOUT_PARAM tp;
600
601 tp.ctx=s;
602 tp.cache=s->sessions;
603 if (tp.cache == NULL) return;
604 tp.time=t;
605 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
606 i=tp.cache->down_load;
607 tp.cache->down_load=0;
608 lh_doall_arg(tp.cache,(void (*)())timeout,&tp);
609 tp.cache->down_load=i;
610 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
611 }
612
613int ssl_clear_bad_session(SSL *s)
614 {
615 if ( (s->session != NULL) &&
616 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
617 !(SSL_in_init(s) || SSL_in_before(s)))
618 {
619 SSL_CTX_remove_session(s->ctx,s->session);
620 return(1);
621 }
622 else
623 return(0);
624 }
625
626/* locked by SSL_CTX in the calling function */
627static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
628 {
629 if ((s->next == NULL) || (s->prev == NULL)) return;
630
631 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
632 { /* last element in list */
633 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
634 { /* only one element in list */
635 ctx->session_cache_head=NULL;
636 ctx->session_cache_tail=NULL;
637 }
638 else
639 {
640 ctx->session_cache_tail=s->prev;
641 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
642 }
643 }
644 else
645 {
646 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
647 { /* first element in list */
648 ctx->session_cache_head=s->next;
649 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
650 }
651 else
652 { /* middle of list */
653 s->next->prev=s->prev;
654 s->prev->next=s->next;
655 }
656 }
657 s->prev=s->next=NULL;
658 }
659
660static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
661 {
662 if ((s->next != NULL) && (s->prev != NULL))
663 SSL_SESSION_list_remove(ctx,s);
664
665 if (ctx->session_cache_head == NULL)
666 {
667 ctx->session_cache_head=s;
668 ctx->session_cache_tail=s;
669 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
670 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
671 }
672 else
673 {
674 s->next=ctx->session_cache_head;
675 s->next->prev=s;
676 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
677 ctx->session_cache_head=s;
678 }
679 }
680
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