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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#ifndef OPENSSL_NO_ENGINE
63#include <openssl/engine.h>
64#endif
65#include "ssl_locl.h"
66
67static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
68static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
69static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
70
71SSL_SESSION *SSL_get_session(const SSL *ssl)
72/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
73 {
74 return(ssl->session);
75 }
76
77SSL_SESSION *SSL_get1_session(SSL *ssl)
78/* variant of SSL_get_session: caller really gets something */
79 {
80 SSL_SESSION *sess;
81 /* Need to lock this all up rather than just use CRYPTO_add so that
82 * somebody doesn't free ssl->session between when we check it's
83 * non-null and when we up the reference count. */
84 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
85 sess = ssl->session;
86 if(sess)
87 sess->references++;
88 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
89 return(sess);
90 }
91
92int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
93 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
94 {
95 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
96 new_func, dup_func, free_func);
97 }
98
99int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
100 {
101 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
102 }
103
104void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
105 {
106 return(CRYPTO_get_ex_data(&s->ex_data,idx));
107 }
108
109SSL_SESSION *SSL_SESSION_new(void)
110 {
111 SSL_SESSION *ss;
112
113 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
114 if (ss == NULL)
115 {
116 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
117 return(0);
118 }
119 memset(ss,0,sizeof(SSL_SESSION));
120
121 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
122 ss->references=1;
123 ss->timeout=60*5+4; /* 5 minute timeout by default */
124 ss->time=(unsigned long)time(NULL);
125 ss->prev=NULL;
126 ss->next=NULL;
127 ss->compress_meth=0;
128#ifndef OPENSSL_NO_TLSEXT
129 ss->tlsext_hostname = NULL;
130#endif
131 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
132 return(ss);
133 }
134
135const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
136 {
137 if(len)
138 *len = s->session_id_length;
139 return s->session_id;
140 }
141
142/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
143 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
144 * until we have no conflict is going to complete in one iteration pretty much
145 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
146 * and we still can't avoid a conflict - well that's a reasonable point to call
147 * it quits. Either the RAND code is broken or someone is trying to open roughly
148 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
149 * store that many sessions is perhaps a more interesting question ... */
150
151#define MAX_SESS_ID_ATTEMPTS 10
152static int def_generate_session_id(const SSL *ssl, unsigned char *id,
153 unsigned int *id_len)
154{
155 unsigned int retry = 0;
156 do
157 if (RAND_pseudo_bytes(id, *id_len) <= 0)
158 return 0;
159 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
160 (++retry < MAX_SESS_ID_ATTEMPTS));
161 if(retry < MAX_SESS_ID_ATTEMPTS)
162 return 1;
163 /* else - woops a session_id match */
164 /* XXX We should also check the external cache --
165 * but the probability of a collision is negligible, and
166 * we could not prevent the concurrent creation of sessions
167 * with identical IDs since we currently don't have means
168 * to atomically check whether a session ID already exists
169 * and make a reservation for it if it does not
170 * (this problem applies to the internal cache as well).
171 */
172 return 0;
173}
174
175int ssl_get_new_session(SSL *s, int session)
176 {
177 /* This gets used by clients and servers. */
178
179 unsigned int tmp;
180 SSL_SESSION *ss=NULL;
181 GEN_SESSION_CB cb = def_generate_session_id;
182
183 if ((ss=SSL_SESSION_new()) == NULL) return(0);
184
185 /* If the context has a default timeout, use it */
186 if (s->ctx->session_timeout == 0)
187 ss->timeout=SSL_get_default_timeout(s);
188 else
189 ss->timeout=s->ctx->session_timeout;
190
191 if (s->session != NULL)
192 {
193 SSL_SESSION_free(s->session);
194 s->session=NULL;
195 }
196
197 if (session)
198 {
199 if (s->version == SSL2_VERSION)
200 {
201 ss->ssl_version=SSL2_VERSION;
202 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
203 }
204 else if (s->version == SSL3_VERSION)
205 {
206 ss->ssl_version=SSL3_VERSION;
207 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
208 }
209 else if (s->version == TLS1_VERSION)
210 {
211 ss->ssl_version=TLS1_VERSION;
212 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
213 }
214 else if (s->version == DTLS1_VERSION)
215 {
216 ss->ssl_version=DTLS1_VERSION;
217 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
218 }
219 else
220 {
221 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
222 SSL_SESSION_free(ss);
223 return(0);
224 }
225#ifndef OPENSSL_NO_TLSEXT
226 /* If RFC4507 ticket use empty session ID */
227 if (s->tlsext_ticket_expected)
228 {
229 ss->session_id_length = 0;
230 goto sess_id_done;
231 }
232#endif
233 /* Choose which callback will set the session ID */
234 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
235 if(s->generate_session_id)
236 cb = s->generate_session_id;
237 else if(s->ctx->generate_session_id)
238 cb = s->ctx->generate_session_id;
239 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
240 /* Choose a session ID */
241 tmp = ss->session_id_length;
242 if(!cb(s, ss->session_id, &tmp))
243 {
244 /* The callback failed */
245 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
246 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
247 SSL_SESSION_free(ss);
248 return(0);
249 }
250 /* Don't allow the callback to set the session length to zero.
251 * nor set it higher than it was. */
252 if(!tmp || (tmp > ss->session_id_length))
253 {
254 /* The callback set an illegal length */
255 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
256 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
257 SSL_SESSION_free(ss);
258 return(0);
259 }
260 /* If the session length was shrunk and we're SSLv2, pad it */
261 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
262 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
263 else
264 ss->session_id_length = tmp;
265 /* Finally, check for a conflict */
266 if(SSL_has_matching_session_id(s, ss->session_id,
267 ss->session_id_length))
268 {
269 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
270 SSL_R_SSL_SESSION_ID_CONFLICT);
271 SSL_SESSION_free(ss);
272 return(0);
273 }
274#ifndef OPENSSL_NO_TLSEXT
275 sess_id_done:
276 if (s->tlsext_hostname) {
277 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
278 if (ss->tlsext_hostname == NULL) {
279 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
280 SSL_SESSION_free(ss);
281 return 0;
282 }
283 }
284#endif
285 }
286 else
287 {
288 ss->session_id_length=0;
289 }
290
291 if (s->sid_ctx_length > sizeof ss->sid_ctx)
292 {
293 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
294 SSL_SESSION_free(ss);
295 return 0;
296 }
297 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
298 ss->sid_ctx_length=s->sid_ctx_length;
299 s->session=ss;
300 ss->ssl_version=s->version;
301 ss->verify_result = X509_V_OK;
302
303 return(1);
304 }
305
306int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
307 const unsigned char *limit)
308 {
309 /* This is used only by servers. */
310
311 SSL_SESSION *ret=NULL;
312 int fatal = 0;
313#ifndef OPENSSL_NO_TLSEXT
314 int r;
315#endif
316
317 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
318 goto err;
319#ifndef OPENSSL_NO_TLSEXT
320 r = tls1_process_ticket(s, session_id, len, limit, &ret);
321 if (r == -1)
322 {
323 fatal = 1;
324 goto err;
325 }
326 else if (r == 0 || (!ret && !len))
327 goto err;
328 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
329#else
330 if (len == 0)
331 goto err;
332 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
333#endif
334 {
335 SSL_SESSION data;
336 data.ssl_version=s->version;
337 data.session_id_length=len;
338 if (len == 0)
339 return 0;
340 memcpy(data.session_id,session_id,len);
341 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
342 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data);
343 if (ret != NULL)
344 /* don't allow other threads to steal it: */
345 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
346 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
347 }
348
349 if (ret == NULL)
350 {
351 int copy=1;
352
353 s->ctx->stats.sess_miss++;
354 ret=NULL;
355 if (s->ctx->get_session_cb != NULL
356 && (ret=s->ctx->get_session_cb(s,session_id,len,&copy))
357 != NULL)
358 {
359 s->ctx->stats.sess_cb_hit++;
360
361 /* Increment reference count now if the session callback
362 * asks us to do so (note that if the session structures
363 * returned by the callback are shared between threads,
364 * it must handle the reference count itself [i.e. copy == 0],
365 * or things won't be thread-safe). */
366 if (copy)
367 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
368
369 /* Add the externally cached session to the internal
370 * cache as well if and only if we are supposed to. */
371 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
372 /* The following should not return 1, otherwise,
373 * things are very strange */
374 SSL_CTX_add_session(s->ctx,ret);
375 }
376 if (ret == NULL)
377 goto err;
378 }
379
380 /* Now ret is non-NULL, and we own one of its reference counts. */
381
382 if (ret->sid_ctx_length != s->sid_ctx_length
383 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))
384 {
385 /* We've found the session named by the client, but we don't
386 * want to use it in this context. */
387
388#if 0 /* The client cannot always know when a session is not appropriate,
389 * so we shouldn't generate an error message. */
390
391 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
392#endif
393 goto err; /* treat like cache miss */
394 }
395
396 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)
397 {
398 /* We can't be sure if this session is being used out of
399 * context, which is especially important for SSL_VERIFY_PEER.
400 * The application should have used SSL[_CTX]_set_session_id_context.
401 *
402 * For this error case, we generate an error instead of treating
403 * the event like a cache miss (otherwise it would be easy for
404 * applications to effectively disable the session cache by
405 * accident without anyone noticing).
406 */
407
408 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
409 fatal = 1;
410 goto err;
411 }
412
413 if (ret->cipher == NULL)
414 {
415 unsigned char buf[5],*p;
416 unsigned long l;
417
418 p=buf;
419 l=ret->cipher_id;
420 l2n(l,p);
421 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR)
422 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
423 else
424 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
425 if (ret->cipher == NULL)
426 goto err;
427 }
428
429
430#if 0 /* This is way too late. */
431
432 /* If a thread got the session, then 'swaped', and another got
433 * it and then due to a time-out decided to 'OPENSSL_free' it we could
434 * be in trouble. So I'll increment it now, then double decrement
435 * later - am I speaking rubbish?. */
436 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
437#endif
438
439 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
440 {
441 s->ctx->stats.sess_timeout++;
442 /* remove it from the cache */
443 SSL_CTX_remove_session(s->ctx,ret);
444 goto err;
445 }
446
447 s->ctx->stats.sess_hit++;
448
449 /* ret->time=time(NULL); */ /* rezero timeout? */
450 /* again, just leave the session
451 * if it is the same session, we have just incremented and
452 * then decremented the reference count :-) */
453 if (s->session != NULL)
454 SSL_SESSION_free(s->session);
455 s->session=ret;
456 s->verify_result = s->session->verify_result;
457 return(1);
458
459 err:
460 if (ret != NULL)
461 SSL_SESSION_free(ret);
462 if (fatal)
463 return -1;
464 else
465 return 0;
466 }
467
468int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
469 {
470 int ret=0;
471 SSL_SESSION *s;
472
473 /* add just 1 reference count for the SSL_CTX's session cache
474 * even though it has two ways of access: each session is in a
475 * doubly linked list and an lhash */
476 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
477 /* if session c is in already in cache, we take back the increment later */
478
479 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
480 s=(SSL_SESSION *)lh_insert(ctx->sessions,c);
481
482 /* s != NULL iff we already had a session with the given PID.
483 * In this case, s == c should hold (then we did not really modify
484 * ctx->sessions), or we're in trouble. */
485 if (s != NULL && s != c)
486 {
487 /* We *are* in trouble ... */
488 SSL_SESSION_list_remove(ctx,s);
489 SSL_SESSION_free(s);
490 /* ... so pretend the other session did not exist in cache
491 * (we cannot handle two SSL_SESSION structures with identical
492 * session ID in the same cache, which could happen e.g. when
493 * two threads concurrently obtain the same session from an external
494 * cache) */
495 s = NULL;
496 }
497
498 /* Put at the head of the queue unless it is already in the cache */
499 if (s == NULL)
500 SSL_SESSION_list_add(ctx,c);
501
502 if (s != NULL)
503 {
504 /* existing cache entry -- decrement previously incremented reference
505 * count because it already takes into account the cache */
506
507 SSL_SESSION_free(s); /* s == c */
508 ret=0;
509 }
510 else
511 {
512 /* new cache entry -- remove old ones if cache has become too large */
513
514 ret=1;
515
516 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
517 {
518 while (SSL_CTX_sess_number(ctx) >
519 SSL_CTX_sess_get_cache_size(ctx))
520 {
521 if (!remove_session_lock(ctx,
522 ctx->session_cache_tail, 0))
523 break;
524 else
525 ctx->stats.sess_cache_full++;
526 }
527 }
528 }
529 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
530 return(ret);
531 }
532
533int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
534{
535 return remove_session_lock(ctx, c, 1);
536}
537
538static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
539 {
540 SSL_SESSION *r;
541 int ret=0;
542
543 if ((c != NULL) && (c->session_id_length != 0))
544 {
545 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
546 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c)
547 {
548 ret=1;
549 r=(SSL_SESSION *)lh_delete(ctx->sessions,c);
550 SSL_SESSION_list_remove(ctx,c);
551 }
552
553 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
554
555 if (ret)
556 {
557 r->not_resumable=1;
558 if (ctx->remove_session_cb != NULL)
559 ctx->remove_session_cb(ctx,r);
560 SSL_SESSION_free(r);
561 }
562 }
563 else
564 ret=0;
565 return(ret);
566 }
567
568void SSL_SESSION_free(SSL_SESSION *ss)
569 {
570 int i;
571
572 if(ss == NULL)
573 return;
574
575 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
576#ifdef REF_PRINT
577 REF_PRINT("SSL_SESSION",ss);
578#endif
579 if (i > 0) return;
580#ifdef REF_CHECK
581 if (i < 0)
582 {
583 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
584 abort(); /* ok */
585 }
586#endif
587
588 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
589
590 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
591 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
592 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
593 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
594 if (ss->peer != NULL) X509_free(ss->peer);
595 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
596#ifndef OPENSSL_NO_TLSEXT
597 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
598 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick);
599#endif
600 OPENSSL_cleanse(ss,sizeof(*ss));
601 OPENSSL_free(ss);
602 }
603
604int SSL_set_session(SSL *s, SSL_SESSION *session)
605 {
606 int ret=0;
607 SSL_METHOD *meth;
608
609 if (session != NULL)
610 {
611 meth=s->ctx->method->get_ssl_method(session->ssl_version);
612 if (meth == NULL)
613 meth=s->method->get_ssl_method(session->ssl_version);
614 if (meth == NULL)
615 {
616 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
617 return(0);
618 }
619
620 if (meth != s->method)
621 {
622 if (!SSL_set_ssl_method(s,meth))
623 return(0);
624 if (s->ctx->session_timeout == 0)
625 session->timeout=SSL_get_default_timeout(s);
626 else
627 session->timeout=s->ctx->session_timeout;
628 }
629
630#ifndef OPENSSL_NO_KRB5
631 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
632 session->krb5_client_princ_len > 0)
633 {
634 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
635 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
636 session->krb5_client_princ_len);
637 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
638 }
639#endif /* OPENSSL_NO_KRB5 */
640
641 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
642 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
643 if (s->session != NULL)
644 SSL_SESSION_free(s->session);
645 s->session=session;
646 s->verify_result = s->session->verify_result;
647 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
648 ret=1;
649 }
650 else
651 {
652 if (s->session != NULL)
653 {
654 SSL_SESSION_free(s->session);
655 s->session=NULL;
656 }
657
658 meth=s->ctx->method;
659 if (meth != s->method)
660 {
661 if (!SSL_set_ssl_method(s,meth))
662 return(0);
663 }
664 ret=1;
665 }
666 return(ret);
667 }
668
669long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
670 {
671 if (s == NULL) return(0);
672 s->timeout=t;
673 return(1);
674 }
675
676long SSL_SESSION_get_timeout(const SSL_SESSION *s)
677 {
678 if (s == NULL) return(0);
679 return(s->timeout);
680 }
681
682long SSL_SESSION_get_time(const SSL_SESSION *s)
683 {
684 if (s == NULL) return(0);
685 return(s->time);
686 }
687
688long SSL_SESSION_set_time(SSL_SESSION *s, long t)
689 {
690 if (s == NULL) return(0);
691 s->time=t;
692 return(t);
693 }
694
695long SSL_CTX_set_timeout(SSL_CTX *s, long t)
696 {
697 long l;
698 if (s == NULL) return(0);
699 l=s->session_timeout;
700 s->session_timeout=t;
701 return(l);
702 }
703
704long SSL_CTX_get_timeout(const SSL_CTX *s)
705 {
706 if (s == NULL) return(0);
707 return(s->session_timeout);
708 }
709
710typedef struct timeout_param_st
711 {
712 SSL_CTX *ctx;
713 long time;
714 LHASH *cache;
715 } TIMEOUT_PARAM;
716
717static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p)
718 {
719 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
720 {
721 /* The reason we don't call SSL_CTX_remove_session() is to
722 * save on locking overhead */
723 lh_delete(p->cache,s);
724 SSL_SESSION_list_remove(p->ctx,s);
725 s->not_resumable=1;
726 if (p->ctx->remove_session_cb != NULL)
727 p->ctx->remove_session_cb(p->ctx,s);
728 SSL_SESSION_free(s);
729 }
730 }
731
732static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *)
733
734void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
735 {
736 unsigned long i;
737 TIMEOUT_PARAM tp;
738
739 tp.ctx=s;
740 tp.cache=s->sessions;
741 if (tp.cache == NULL) return;
742 tp.time=t;
743 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
744 i=tp.cache->down_load;
745 tp.cache->down_load=0;
746 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp);
747 tp.cache->down_load=i;
748 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
749 }
750
751int ssl_clear_bad_session(SSL *s)
752 {
753 if ( (s->session != NULL) &&
754 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
755 !(SSL_in_init(s) || SSL_in_before(s)))
756 {
757 SSL_CTX_remove_session(s->ctx,s->session);
758 return(1);
759 }
760 else
761 return(0);
762 }
763
764/* locked by SSL_CTX in the calling function */
765static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
766 {
767 if ((s->next == NULL) || (s->prev == NULL)) return;
768
769 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
770 { /* last element in list */
771 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
772 { /* only one element in list */
773 ctx->session_cache_head=NULL;
774 ctx->session_cache_tail=NULL;
775 }
776 else
777 {
778 ctx->session_cache_tail=s->prev;
779 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
780 }
781 }
782 else
783 {
784 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
785 { /* first element in list */
786 ctx->session_cache_head=s->next;
787 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
788 }
789 else
790 { /* middle of list */
791 s->next->prev=s->prev;
792 s->prev->next=s->next;
793 }
794 }
795 s->prev=s->next=NULL;
796 }
797
798static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
799 {
800 if ((s->next != NULL) && (s->prev != NULL))
801 SSL_SESSION_list_remove(ctx,s);
802
803 if (ctx->session_cache_head == NULL)
804 {
805 ctx->session_cache_head=s;
806 ctx->session_cache_tail=s;
807 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
808 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
809 }
810 else
811 {
812 s->next=ctx->session_cache_head;
813 s->next->prev=s;
814 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
815 ctx->session_cache_head=s;
816 }
817 }
818
819void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
820 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))
821 {
822 ctx->new_session_cb=cb;
823 }
824
825int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
826 {
827 return ctx->new_session_cb;
828 }
829
830void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
831 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))
832 {
833 ctx->remove_session_cb=cb;
834 }
835
836void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)
837 {
838 return ctx->remove_session_cb;
839 }
840
841void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
842 SSL_SESSION *(*cb)(struct ssl_st *ssl,
843 unsigned char *data,int len,int *copy))
844 {
845 ctx->get_session_cb=cb;
846 }
847
848SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,
849 unsigned char *data,int len,int *copy)
850 {
851 return ctx->get_session_cb;
852 }
853
854void SSL_CTX_set_info_callback(SSL_CTX *ctx,
855 void (*cb)(const SSL *ssl,int type,int val))
856 {
857 ctx->info_callback=cb;
858 }
859
860void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)
861 {
862 return ctx->info_callback;
863 }
864
865void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
866 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
867 {
868 ctx->client_cert_cb=cb;
869 }
870
871int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)
872 {
873 return ctx->client_cert_cb;
874 }
875
876#ifndef OPENSSL_NO_ENGINE
877int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
878 {
879 if (!ENGINE_init(e))
880 {
881 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB);
882 return 0;
883 }
884 if(!ENGINE_get_ssl_client_cert_function(e))
885 {
886 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD);
887 ENGINE_finish(e);
888 return 0;
889 }
890 ctx->client_cert_engine = e;
891 return 1;
892 }
893#endif
894
895void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
896 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
897 {
898 ctx->app_gen_cookie_cb=cb;
899 }
900
901void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
902 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
903 {
904 ctx->app_verify_cookie_cb=cb;
905 }
906
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