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diff --git a/src/lib/libssl/ssl_sess.c b/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);
67
68SSL_SESSION *SSL_get_session(SSL *ssl)
69/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
70 {
71 return(ssl->session);
72 }
73
74SSL_SESSION *SSL_get1_session(SSL *ssl)
75/* variant of SSL_get_session: caller really gets something */
76 {
77 SSL_SESSION *sess;
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);
82 sess = ssl->session;
83 if(sess)
84 sess->references++;
85 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
86 return(sess);
87 }
88
89int 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)
91 {
92 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
93 new_func, dup_func, free_func);
94 }
95
96int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
97 {
98 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
99 }
100
101void *SSL_SESSION_get_ex_data(SSL_SESSION *s, int idx)
102 {
103 return(CRYPTO_get_ex_data(&s->ex_data,idx));
104 }
105
106SSL_SESSION *SSL_SESSION_new(void)
107 {
108 SSL_SESSION *ss;
109
110 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
111 if (ss == NULL)
112 {
113 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
114 return(0);
115 }
116 memset(ss,0,sizeof(SSL_SESSION));
117
118 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
119 ss->references=1;
120 ss->timeout=60*5+4; /* 5 minute timeout by default */
121 ss->time=time(NULL);
122 ss->prev=NULL;
123 ss->next=NULL;
124 ss->compress_meth=0;
125 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
126 return(ss);
127 }
128
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 ... */
137
138#define MAX_SESS_ID_ATTEMPTS 10
139static int def_generate_session_id(const SSL *ssl, unsigned char *id,
140 unsigned int *id_len)
141{
142 unsigned int retry = 0;
143 do
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)
148 return 1;
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).
157 */
158 return 0;
159}
160
161int ssl_get_new_session(SSL *s, int session)
162 {
163 /* This gets used by clients and servers. */
164
165 unsigned int tmp;
166 SSL_SESSION *ss=NULL;
167 GEN_SESSION_CB cb = def_generate_session_id;
168
169 if ((ss=SSL_SESSION_new()) == NULL) return(0);
170
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);
174 else
175 ss->timeout=s->ctx->session_timeout;
176
177 if (s->session != NULL)
178 {
179 SSL_SESSION_free(s->session);
180 s->session=NULL;
181 }
182
183 if (session)
184 {
185 if (s->version == SSL2_VERSION)
186 {
187 ss->ssl_version=SSL2_VERSION;
188 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
189 }
190 else if (s->version == SSL3_VERSION)
191 {
192 ss->ssl_version=SSL3_VERSION;
193 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
194 }
195 else if (s->version == TLS1_VERSION)
196 {
197 ss->ssl_version=TLS1_VERSION;
198 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
199 }
200 else
201 {
202 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
203 SSL_SESSION_free(ss);
204 return(0);
205 }
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))
216 {
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);
221 return(0);
222 }
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))
226 {
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);
231 return(0);
232 }
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);
236 else
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))
241 {
242 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
243 SSL_R_SSL_SESSION_ID_CONFLICT);
244 SSL_SESSION_free(ss);
245 return(0);
246 }
247 }
248 else
249 {
250 ss->session_id_length=0;
251 }
252
253 if (s->sid_ctx_length > sizeof ss->sid_ctx)
254 {
255 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
256 SSL_SESSION_free(ss);
257 return 0;
258 }
259 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
260 ss->sid_ctx_length=s->sid_ctx_length;
261 s->session=ss;
262 ss->ssl_version=s->version;
263 ss->verify_result = X509_V_OK;
264
265 return(1);
266 }
267
268int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len)
269 {
270 /* This is used only by servers. */
271
272 SSL_SESSION *ret=NULL,data;
273 int fatal = 0;
274
275 data.ssl_version=s->version;
276 data.session_id_length=len;
277 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
278 goto err;
279 memcpy(data.session_id,session_id,len);
280
281 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
282 {
283 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
284 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
285 if (ret != NULL)
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);
289 }
290
291 if (ret == NULL)
292 {
293 int copy=1;
294
295 s->ctx->stats.sess_miss++;
296 ret=NULL;
297 if (s->ctx->get_session_cb != NULL
298 && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))
299 != NULL)
300 {
301 s->ctx->stats.sess_cb_hit++;
302
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). */
308 if (copy)
309 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
310
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);
317 }
318 if (ret == NULL)
319 goto err;
320 }
321
322 /* Now ret is non-NULL, and we own one of its reference counts. */
323
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)))
327 {
328 /* We've found the session named by the client, but we don't
329 * want to use it in this context. */
330
331 if (s->sid_ctx_length == 0)
332 {
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 */
337
338 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
339 fatal = 1;
340 goto err;
341 }
342 else
343 {
344#if 0 /* The client cannot always know when a session is not appropriate,
345 * so we shouldn't generate an error message. */
346
347 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
348#endif
349 goto err; /* treat like cache miss */
350 }
351 }
352
353 if (ret->cipher == NULL)
354 {
355 unsigned char buf[5],*p;
356 unsigned long l;
357
358 p=buf;
359 l=ret->cipher_id;
360 l2n(l,p);
361 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
362 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
363 else
364 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
365 if (ret->cipher == NULL)
366 goto err;
367 }
368
369
370#if 0 /* This is way too late. */
371
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);
377#endif
378
379 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */
380 {
381 s->ctx->stats.sess_timeout++;
382 /* remove it from the cache */
383 SSL_CTX_remove_session(s->ctx,ret);
384 goto err;
385 }
386
387 s->ctx->stats.sess_hit++;
388
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);
395 s->session=ret;
396 s->verify_result = s->session->verify_result;
397 return(1);
398
399 err:
400 if (ret != NULL)
401 SSL_SESSION_free(ret);
402 if (fatal)
403 return -1;
404 else
405 return 0;
406 }
407
408int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
409 {
410 int ret=0;
411 SSL_SESSION *s;
412
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 */
418
419 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
420 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
421
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)
426 {
427 /* We *are* in trouble ... */
428 SSL_SESSION_list_remove(ctx,s);
429 SSL_SESSION_free(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
434 * cache) */
435 s = NULL;
436 }
437
438 /* Put at the head of the queue unless it is already in the cache */
439 if (s == NULL)
440 SSL_SESSION_list_add(ctx,c);
441
442 if (s != NULL)
443 {
444 /* existing cache entry -- decrement previously incremented reference
445 * count because it already takes into account the cache */
446
447 SSL_SESSION_free(s); /* s == c */
448 ret=0;
449 }
450 else
451 {
452 /* new cache entry -- remove old ones if cache has become too large */
453
454 ret=1;
455
456 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
457 {
458 while (SSL_CTX_sess_number(ctx) >
459 SSL_CTX_sess_get_cache_size(ctx))
460 {
461 if (!remove_session_lock(ctx,
462 ctx->session_cache_tail, 0))
463 break;
464 else
465 ctx->stats.sess_cache_full++;
466 }
467 }
468 }
469 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
470 return(ret);
471 }
472
473int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
474{
475 return remove_session_lock(ctx, c, 1);
476}
477
478static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
479 {
480 SSL_SESSION *r;
481 int ret=0;
482
483 if ((c != NULL) && (c->session_id_length != 0))
484 {
485 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
486 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
487 {
488 ret=1;
489 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
490 SSL_SESSION_list_remove(ctx,c);
491 }
492
493 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
494
495 if (ret)
496 {
497 r->not_resumable=1;
498 if (ctx->remove_session_cb != NULL)
499 ctx->remove_session_cb(ctx,r);
500 SSL_SESSION_free(r);
501 }
502 }
503 else
504 ret=0;
505 return(ret);
506 }
507
508void SSL_SESSION_free(SSL_SESSION *ss)
509 {
510 int i;
511
512 if(ss == NULL)
513 return;
514
515 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
516#ifdef REF_PRINT
517 REF_PRINT("SSL_SESSION",ss);
518#endif
519 if (i > 0) return;
520#ifdef REF_CHECK
521 if (i < 0)
522 {
523 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
524 abort(); /* ok */
525 }
526#endif
527
528 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
529
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));
537 OPENSSL_free(ss);
538 }
539
540int SSL_set_session(SSL *s, SSL_SESSION *session)
541 {
542 int ret=0;
543 SSL_METHOD *meth;
544
545 if (session != NULL)
546 {
547 meth=s->ctx->method->get_ssl_method(session->ssl_version);
548 if (meth == NULL)
549 meth=s->method->get_ssl_method(session->ssl_version);
550 if (meth == NULL)
551 {
552 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
553 return(0);
554 }
555
556 if (meth != s->method)
557 {
558 if (!SSL_set_ssl_method(s,meth))
559 return(0);
560 if (s->ctx->session_timeout == 0)
561 session->timeout=SSL_get_default_timeout(s);
562 else
563 session->timeout=s->ctx->session_timeout;
564 }
565
566#ifndef OPENSSL_NO_KRB5
567 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
568 session->krb5_client_princ_len > 0)
569 {
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';
574 }
575#endif /* OPENSSL_NO_KRB5 */
576
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);
581 s->session=session;
582 s->verify_result = s->session->verify_result;
583 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
584 ret=1;
585 }
586 else
587 {
588 if (s->session != NULL)
589 {
590 SSL_SESSION_free(s->session);
591 s->session=NULL;
592 }
593
594 meth=s->ctx->method;
595 if (meth != s->method)
596 {
597 if (!SSL_set_ssl_method(s,meth))
598 return(0);
599 }
600 ret=1;
601 }
602 return(ret);
603 }
604
605long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
606 {
607 if (s == NULL) return(0);
608 s->timeout=t;
609 return(1);
610 }
611
612long SSL_SESSION_get_timeout(SSL_SESSION *s)
613 {
614 if (s == NULL) return(0);
615 return(s->timeout);
616 }
617
618long SSL_SESSION_get_time(SSL_SESSION *s)
619 {
620 if (s == NULL) return(0);
621 return(s->time);
622 }
623
624long SSL_SESSION_set_time(SSL_SESSION *s, long t)
625 {
626 if (s == NULL) return(0);
627 s->time=t;
628 return(t);
629 }
630
631long SSL_CTX_set_timeout(SSL_CTX *s, long t)
632 {
633 long l;
634 if (s == NULL) return(0);
635 l=s->session_timeout;
636 s->session_timeout=t;
637 return(l);
638 }
639
640long SSL_CTX_get_timeout(SSL_CTX *s)
641 {
642 if (s == NULL) return(0);
643 return(s->session_timeout);
644 }
645
646typedef struct timeout_param_st
647 {
648 SSL_CTX *ctx;
649 long time;
650 LHASH *cache;
651 } TIMEOUT_PARAM;
652
653static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
654 {
655 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
656 {
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);
661 s->not_resumable=1;
662 if (p->ctx->remove_session_cb != NULL)
663 p->ctx->remove_session_cb(p->ctx,s);
664 SSL_SESSION_free(s);
665 }
666 }
667
668static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
669
670void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
671 {
672 unsigned long i;
673 TIMEOUT_PARAM tp;
674
675 tp.ctx=s;
676 tp.cache=s->sessions;
677 if (tp.cache == NULL) return;
678 tp.time=t;
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);
685 }
686
687int ssl_clear_bad_session(SSL *s)
688 {
689 if ( (s->session != NULL) &&
690 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
691 !(SSL_in_init(s) || SSL_in_before(s)))
692 {
693 SSL_CTX_remove_session(s->ctx,s->session);
694 return(1);
695 }
696 else
697 return(0);
698 }
699
700/* locked by SSL_CTX in the calling function */
701static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
702 {
703 if ((s->next == NULL) || (s->prev == NULL)) return;
704
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;
711 }
712 else
713 {
714 ctx->session_cache_tail=s->prev;
715 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
716 }
717 }
718 else
719 {
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);
724 }
725 else
726 { /* middle of list */
727 s->next->prev=s->prev;
728 s->prev->next=s->next;
729 }
730 }
731 s->prev=s->next=NULL;
732 }
733
734static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
735 {
736 if ((s->next != NULL) && (s->prev != NULL))
737 SSL_SESSION_list_remove(ctx,s);
738
739 if (ctx->session_cache_head == NULL)
740 {
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);
745 }
746 else
747 {
748 s->next=ctx->session_cache_head;
749 s->next->prev=s;
750 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
751 ctx->session_cache_head=s;
752 }
753 }
754
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-20 06:04:00 +0000