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1/* $OpenBSD: ssl_sess.c,v 1.45 2015/07/21 03:34:38 doug Exp $ */
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 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
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
71 * distribution.
72 *
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/)"
77 *
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.
82 *
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.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
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 * ====================================================================
105 *
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).
109 *
110 */
111/* ====================================================================
112 * Copyright 2005 Nokia. All rights reserved.
113 *
114 * The portions of the attached software ("Contribution") is developed by
115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
116 * license.
117 *
118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
120 * support (see RFC 4279) to OpenSSL.
121 *
122 * No patent licenses or other rights except those expressly stated in
123 * the OpenSSL open source license shall be deemed granted or received
124 * expressly, by implication, estoppel, or otherwise.
125 *
126 * No assurances are provided by Nokia that the Contribution does not
127 * infringe the patent or other intellectual property rights of any third
128 * party or that the license provides you with all the necessary rights
129 * to make use of the Contribution.
130 *
131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
135 * OTHERWISE.
136 */
137
138#include <openssl/lhash.h>
139
140#ifndef OPENSSL_NO_ENGINE
141#include <openssl/engine.h>
142#endif
143
144#include "ssl_locl.h"
145
146static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
147static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
148static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
149
150/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
151SSL_SESSION *
152SSL_get_session(const SSL *ssl)
153{
154 return (ssl->session);
155}
156
157/* variant of SSL_get_session: caller really gets something */
158SSL_SESSION *
159SSL_get1_session(SSL *ssl)
160{
161 SSL_SESSION *sess;
162
163 /*
164 * Need to lock this all up rather than just use CRYPTO_add so that
165 * somebody doesn't free ssl->session between when we check it's
166 * non-null and when we up the reference count.
167 */
168 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
169 sess = ssl->session;
170 if (sess)
171 sess->references++;
172 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
173
174 return (sess);
175}
176
177int
178SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
179 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
180{
181 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION,
182 argl, argp, new_func, dup_func, free_func);
183}
184
185int
186SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
187{
188 return (CRYPTO_set_ex_data(&s->ex_data, idx, arg));
189}
190
191void *
192SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
193{
194 return (CRYPTO_get_ex_data(&s->ex_data, idx));
195}
196
197SSL_SESSION *
198SSL_SESSION_new(void)
199{
200 SSL_SESSION *ss;
201
202 ss = calloc(1, sizeof(SSL_SESSION));
203 if (ss == NULL) {
204 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE);
205 return (0);
206 }
207
208 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
209 ss->references = 1;
210 ss->timeout=60*5+4; /* 5 minute timeout by default */
211 ss->time = time(NULL);
212 ss->prev = NULL;
213 ss->next = NULL;
214 ss->tlsext_hostname = NULL;
215
216 ss->tlsext_ecpointformatlist_length = 0;
217 ss->tlsext_ecpointformatlist = NULL;
218 ss->tlsext_ellipticcurvelist_length = 0;
219 ss->tlsext_ellipticcurvelist = NULL;
220
221 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
222
223 return (ss);
224}
225
226const unsigned char *
227SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
228{
229 if (len)
230 *len = s->session_id_length;
231 return s->session_id;
232}
233
234unsigned int
235SSL_SESSION_get_compress_id(const SSL_SESSION *s)
236{
237 return 0;
238}
239
240/*
241 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
242 * the ID with random gunk repeatedly until we have no conflict is going to
243 * complete in one iteration pretty much "most" of the time (btw:
244 * understatement). So, if it takes us 10 iterations and we still can't avoid
245 * a conflict - well that's a reasonable point to call it quits. Either the
246 * arc4random code is broken or someone is trying to open roughly very close to
247 * 2^128 (or 2^256) SSL sessions to our server. How you might store that many
248 * sessions is perhaps a more interesting question...
249 */
250
251#define MAX_SESS_ID_ATTEMPTS 10
252
253static int
254def_generate_session_id(const SSL *ssl, unsigned char *id, unsigned int *id_len)
255{
256 unsigned int retry = 0;
257
258 do {
259 arc4random_buf(id, *id_len);
260 } while (SSL_has_matching_session_id(ssl, id, *id_len) &&
261 (++retry < MAX_SESS_ID_ATTEMPTS));
262
263 if (retry < MAX_SESS_ID_ATTEMPTS)
264 return 1;
265
266 /* else - woops a session_id match */
267 /* XXX We should also check the external cache --
268 * but the probability of a collision is negligible, and
269 * we could not prevent the concurrent creation of sessions
270 * with identical IDs since we currently don't have means
271 * to atomically check whether a session ID already exists
272 * and make a reservation for it if it does not
273 * (this problem applies to the internal cache as well).
274 */
275 return 0;
276}
277
278int
279ssl_get_new_session(SSL *s, int session)
280{
281 unsigned int tmp;
282 SSL_SESSION *ss = NULL;
283 GEN_SESSION_CB cb = def_generate_session_id;
284
285 /* This gets used by clients and servers. */
286
287 if ((ss = SSL_SESSION_new()) == NULL)
288 return (0);
289
290 /* If the context has a default timeout, use it */
291 if (s->session_ctx->session_timeout == 0)
292 ss->timeout = SSL_get_default_timeout(s);
293 else
294 ss->timeout = s->session_ctx->session_timeout;
295
296 if (s->session != NULL) {
297 SSL_SESSION_free(s->session);
298 s->session = NULL;
299 }
300
301 if (session) {
302 switch (s->version) {
303 case SSL3_VERSION:
304 case TLS1_VERSION:
305 case TLS1_1_VERSION:
306 case TLS1_2_VERSION:
307 case DTLS1_BAD_VER:
308 case DTLS1_VERSION:
309 ss->ssl_version = s->version;
310 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
311 break;
312 default:
313 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
314 SSL_R_UNSUPPORTED_SSL_VERSION);
315 SSL_SESSION_free(ss);
316 return (0);
317 }
318
319 /* If RFC4507 ticket use empty session ID. */
320 if (s->tlsext_ticket_expected) {
321 ss->session_id_length = 0;
322 goto sess_id_done;
323 }
324
325 /* Choose which callback will set the session ID. */
326 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
327 if (s->generate_session_id)
328 cb = s->generate_session_id;
329 else if (s->session_ctx->generate_session_id)
330 cb = s->session_ctx->generate_session_id;
331 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
332
333 /* Choose a session ID. */
334 tmp = ss->session_id_length;
335 if (!cb(s, ss->session_id, &tmp)) {
336 /* The callback failed */
337 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
338 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
339 SSL_SESSION_free(ss);
340 return (0);
341 }
342
343 /*
344 * Don't allow the callback to set the session length to zero.
345 * nor set it higher than it was.
346 */
347 if (!tmp || (tmp > ss->session_id_length)) {
348 /* The callback set an illegal length */
349 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
350 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
351 SSL_SESSION_free(ss);
352 return (0);
353 }
354 ss->session_id_length = tmp;
355
356 /* Finally, check for a conflict. */
357 if (SSL_has_matching_session_id(s, ss->session_id,
358 ss->session_id_length)) {
359 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
360 SSL_R_SSL_SESSION_ID_CONFLICT);
361 SSL_SESSION_free(ss);
362 return (0);
363 }
364
365sess_id_done:
366 if (s->tlsext_hostname) {
367 ss->tlsext_hostname = strdup(s->tlsext_hostname);
368 if (ss->tlsext_hostname == NULL) {
369 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
370 ERR_R_INTERNAL_ERROR);
371 SSL_SESSION_free(ss);
372 return 0;
373 }
374 }
375 } else {
376 ss->session_id_length = 0;
377 }
378
379 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
380 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
381 SSL_SESSION_free(ss);
382 return 0;
383 }
384
385 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
386 ss->sid_ctx_length = s->sid_ctx_length;
387 s->session = ss;
388 ss->ssl_version = s->version;
389 ss->verify_result = X509_V_OK;
390
391 return (1);
392}
393
394/*
395 * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
396 * connection. It is only called by servers.
397 *
398 * session_id: points at the session ID in the ClientHello. This code will
399 * read past the end of this in order to parse out the session ticket
400 * extension, if any.
401 * len: the length of the session ID.
402 * limit: a pointer to the first byte after the ClientHello.
403 *
404 * Returns:
405 * -1: error
406 * 0: a session may have been found.
407 *
408 * Side effects:
409 * - If a session is found then s->session is pointed at it (after freeing
410 * an existing session if need be) and s->verify_result is set from the
411 * session.
412 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set
413 * to 1 if the server should issue a new session ticket (to 0 otherwise).
414 */
415int
416ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
417 const unsigned char *limit)
418{
419 SSL_SESSION *ret = NULL;
420 int fatal = 0;
421 int try_session_cache = 1;
422 int r;
423
424 /* This is used only by servers. */
425
426 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
427 goto err;
428
429 if (len == 0)
430 try_session_cache = 0;
431
432 /* Sets s->tlsext_ticket_expected. */
433 r = tls1_process_ticket(s, session_id, len, limit, &ret);
434 switch (r) {
435 case -1: /* Error during processing */
436 fatal = 1;
437 goto err;
438 case 0: /* No ticket found */
439 case 1: /* Zero length ticket found */
440 break; /* Ok to carry on processing session id. */
441 case 2: /* Ticket found but not decrypted. */
442 case 3: /* Ticket decrypted, *ret has been set. */
443 try_session_cache = 0;
444 break;
445 default:
446 abort();
447 }
448
449 if (try_session_cache && ret == NULL &&
450 !(s->session_ctx->session_cache_mode &
451 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
452 SSL_SESSION data;
453 data.ssl_version = s->version;
454 data.session_id_length = len;
455 memcpy(data.session_id, session_id, len);
456
457 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
458 ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
459 if (ret != NULL) {
460 /* Don't allow other threads to steal it. */
461 CRYPTO_add(&ret->references, 1,
462 CRYPTO_LOCK_SSL_SESSION);
463 }
464 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
465
466 if (ret == NULL)
467 s->session_ctx->stats.sess_miss++;
468 }
469
470 if (try_session_cache && ret == NULL &&
471 s->session_ctx->get_session_cb != NULL) {
472 int copy = 1;
473
474 if ((ret = s->session_ctx->get_session_cb(s, session_id,
475 len, &copy))) {
476 s->session_ctx->stats.sess_cb_hit++;
477
478 /*
479 * Increment reference count now if the session
480 * callback asks us to do so (note that if the session
481 * structures returned by the callback are shared
482 * between threads, it must handle the reference count
483 * itself [i.e. copy == 0], or things won't be
484 * thread-safe).
485 */
486 if (copy)
487 CRYPTO_add(&ret->references, 1,
488 CRYPTO_LOCK_SSL_SESSION);
489
490 /*
491 * Add the externally cached session to the internal
492 * cache as well if and only if we are supposed to.
493 */
494 if (!(s->session_ctx->session_cache_mode &
495 SSL_SESS_CACHE_NO_INTERNAL_STORE))
496 /*
497 * The following should not return 1,
498 * otherwise, things are very strange.
499 */
500 SSL_CTX_add_session(s->session_ctx, ret);
501 }
502 }
503
504 if (ret == NULL)
505 goto err;
506
507 /* Now ret is non-NULL and we own one of its reference counts. */
508
509 if (ret->sid_ctx_length != s->sid_ctx_length ||
510 timingsafe_memcmp(ret->sid_ctx,
511 s->sid_ctx, ret->sid_ctx_length) != 0) {
512 /* We have the session requested by the client, but we don't
513 * want to use it in this context. */
514 goto err; /* treat like cache miss */
515 }
516
517 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
518 /*
519 * We can't be sure if this session is being used out of
520 * context, which is especially important for SSL_VERIFY_PEER.
521 * The application should have used
522 * SSL[_CTX]_set_session_id_context.
523 *
524 * For this error case, we generate an error instead of treating
525 * the event like a cache miss (otherwise it would be easy for
526 * applications to effectively disable the session cache by
527 * accident without anyone noticing).
528 */
529 SSLerr(SSL_F_SSL_GET_PREV_SESSION,
530 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
531 fatal = 1;
532 goto err;
533 }
534
535 if (ret->cipher == NULL) {
536 ret->cipher = ssl3_get_cipher_by_id(ret->cipher_id);
537 if (ret->cipher == NULL)
538 goto err;
539 }
540
541 if (ret->timeout < (time(NULL) - ret->time)) {
542 /* timeout */
543 s->session_ctx->stats.sess_timeout++;
544 if (try_session_cache) {
545 /* session was from the cache, so remove it */
546 SSL_CTX_remove_session(s->session_ctx, ret);
547 }
548 goto err;
549 }
550
551 s->session_ctx->stats.sess_hit++;
552
553 if (s->session != NULL)
554 SSL_SESSION_free(s->session);
555 s->session = ret;
556 s->verify_result = s->session->verify_result;
557 return 1;
558
559err:
560 if (ret != NULL) {
561 SSL_SESSION_free(ret);
562 if (!try_session_cache) {
563 /*
564 * The session was from a ticket, so we should
565 * issue a ticket for the new session.
566 */
567 s->tlsext_ticket_expected = 1;
568 }
569 }
570 if (fatal)
571 return -1;
572 else
573 return 0;
574}
575
576int
577SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
578{
579 int ret = 0;
580 SSL_SESSION *s;
581
582 /*
583 * Add just 1 reference count for the SSL_CTX's session cache
584 * even though it has two ways of access: each session is in a
585 * doubly linked list and an lhash.
586 */
587 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
588
589 /*
590 * If session c is in already in cache, we take back the increment
591 * later.
592 */
593 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
594 s = lh_SSL_SESSION_insert(ctx->sessions, c);
595
596 /*
597 * s != NULL iff we already had a session with the given PID.
598 * In this case, s == c should hold (then we did not really modify
599 * ctx->sessions), or we're in trouble.
600 */
601 if (s != NULL && s != c) {
602 /* We *are* in trouble ... */
603 SSL_SESSION_list_remove(ctx, s);
604 SSL_SESSION_free(s);
605 /*
606 * ... so pretend the other session did not exist in cache
607 * (we cannot handle two SSL_SESSION structures with identical
608 * session ID in the same cache, which could happen e.g. when
609 * two threads concurrently obtain the same session from an
610 * external cache).
611 */
612 s = NULL;
613 }
614
615 /* Put at the head of the queue unless it is already in the cache */
616 if (s == NULL)
617 SSL_SESSION_list_add(ctx, c);
618
619 if (s != NULL) {
620 /*
621 * existing cache entry -- decrement previously incremented
622 * reference count because it already takes into account the
623 * cache.
624 */
625 SSL_SESSION_free(s); /* s == c */
626 ret = 0;
627 } else {
628 /*
629 * New cache entry -- remove old ones if cache has become
630 * too large.
631 */
632
633 ret = 1;
634
635 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
636 while (SSL_CTX_sess_number(ctx) >
637 SSL_CTX_sess_get_cache_size(ctx)) {
638 if (!remove_session_lock(ctx,
639 ctx->session_cache_tail, 0))
640 break;
641 else
642 ctx->stats.sess_cache_full++;
643 }
644 }
645 }
646 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
647 return (ret);
648}
649
650int
651SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
652{
653 return remove_session_lock(ctx, c, 1);
654}
655
656static int
657remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
658{
659 SSL_SESSION *r;
660 int ret = 0;
661
662 if ((c != NULL) && (c->session_id_length != 0)) {
663 if (lck)
664 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
665 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
666 ret = 1;
667 r = lh_SSL_SESSION_delete(ctx->sessions, c);
668 SSL_SESSION_list_remove(ctx, c);
669 }
670 if (lck)
671 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
672
673 if (ret) {
674 r->not_resumable = 1;
675 if (ctx->remove_session_cb != NULL)
676 ctx->remove_session_cb(ctx, r);
677 SSL_SESSION_free(r);
678 }
679 } else
680 ret = 0;
681 return (ret);
682}
683
684void
685SSL_SESSION_free(SSL_SESSION *ss)
686{
687 int i;
688
689 if (ss == NULL)
690 return;
691
692 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
693 if (i > 0)
694 return;
695
696 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
697
698 OPENSSL_cleanse(ss->master_key, sizeof ss->master_key);
699 OPENSSL_cleanse(ss->session_id, sizeof ss->session_id);
700 if (ss->sess_cert != NULL)
701 ssl_sess_cert_free(ss->sess_cert);
702 if (ss->peer != NULL)
703 X509_free(ss->peer);
704 if (ss->ciphers != NULL)
705 sk_SSL_CIPHER_free(ss->ciphers);
706 free(ss->tlsext_hostname);
707 free(ss->tlsext_tick);
708 ss->tlsext_ecpointformatlist_length = 0;
709 free(ss->tlsext_ecpointformatlist);
710 ss->tlsext_ellipticcurvelist_length = 0;
711 free(ss->tlsext_ellipticcurvelist);
712 OPENSSL_cleanse(ss, sizeof(*ss));
713 free(ss);
714}
715
716int
717SSL_set_session(SSL *s, SSL_SESSION *session)
718{
719 int ret = 0;
720 const SSL_METHOD *meth;
721
722 if (session != NULL) {
723 meth = s->ctx->method->get_ssl_method(session->ssl_version);
724 if (meth == NULL)
725 meth = s->method->get_ssl_method(session->ssl_version);
726 if (meth == NULL) {
727 SSLerr(SSL_F_SSL_SET_SESSION,
728 SSL_R_UNABLE_TO_FIND_SSL_METHOD);
729 return (0);
730 }
731
732 if (meth != s->method) {
733 if (!SSL_set_ssl_method(s, meth))
734 return (0);
735 }
736
737
738 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
739 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
740 if (s->session != NULL)
741 SSL_SESSION_free(s->session);
742 s->session = session;
743 s->verify_result = s->session->verify_result;
744 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
745 ret = 1;
746 } else {
747 if (s->session != NULL) {
748 SSL_SESSION_free(s->session);
749 s->session = NULL;
750 }
751
752 meth = s->ctx->method;
753 if (meth != s->method) {
754 if (!SSL_set_ssl_method(s, meth))
755 return (0);
756 }
757 ret = 1;
758 }
759 return (ret);
760}
761
762long
763SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
764{
765 if (s == NULL)
766 return (0);
767 s->timeout = t;
768 return (1);
769}
770
771long
772SSL_SESSION_get_timeout(const SSL_SESSION *s)
773{
774 if (s == NULL)
775 return (0);
776 return (s->timeout);
777}
778
779/* XXX 2038 */
780long
781SSL_SESSION_get_time(const SSL_SESSION *s)
782{
783 if (s == NULL)
784 return (0);
785 return (s->time);
786}
787
788/* XXX 2038 */
789long
790SSL_SESSION_set_time(SSL_SESSION *s, long t)
791{
792 if (s == NULL)
793 return (0);
794 s->time = t;
795 return (t);
796}
797
798X509 *
799SSL_SESSION_get0_peer(SSL_SESSION *s)
800{
801 return s->peer;
802}
803
804int
805SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
806 unsigned int sid_ctx_len)
807{
808 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
809 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,
810 SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
811 return 0;
812 }
813 s->sid_ctx_length = sid_ctx_len;
814 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
815
816 return 1;
817}
818
819long
820SSL_CTX_set_timeout(SSL_CTX *s, long t)
821{
822 long l;
823
824 if (s == NULL)
825 return (0);
826 l = s->session_timeout;
827 s->session_timeout = t;
828
829 return (l);
830}
831
832long
833SSL_CTX_get_timeout(const SSL_CTX *s)
834{
835 if (s == NULL)
836 return (0);
837 return (s->session_timeout);
838}
839
840int
841SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s,
842 void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers,
843 SSL_CIPHER **cipher, void *arg), void *arg)
844{
845 if (s == NULL)
846 return (0);
847 s->tls_session_secret_cb = tls_session_secret_cb;
848 s->tls_session_secret_cb_arg = arg;
849 return (1);
850}
851
852int
853SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
854 void *arg)
855{
856 if (s == NULL)
857 return (0);
858 s->tls_session_ticket_ext_cb = cb;
859 s->tls_session_ticket_ext_cb_arg = arg;
860 return (1);
861}
862
863int
864SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
865{
866 if (s->version >= TLS1_VERSION) {
867 free(s->tlsext_session_ticket);
868 s->tlsext_session_ticket =
869 malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
870 if (!s->tlsext_session_ticket) {
871 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT,
872 ERR_R_MALLOC_FAILURE);
873 return 0;
874 }
875
876 if (ext_data) {
877 s->tlsext_session_ticket->length = ext_len;
878 s->tlsext_session_ticket->data =
879 s->tlsext_session_ticket + 1;
880 memcpy(s->tlsext_session_ticket->data,
881 ext_data, ext_len);
882 } else {
883 s->tlsext_session_ticket->length = 0;
884 s->tlsext_session_ticket->data = NULL;
885 }
886
887 return 1;
888 }
889
890 return 0;
891}
892
893typedef struct timeout_param_st {
894 SSL_CTX *ctx;
895 long time;
896 LHASH_OF(SSL_SESSION) *cache;
897} TIMEOUT_PARAM;
898
899static void
900timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p)
901{
902 if ((p->time == 0) || (p->time > (s->time + s->timeout))) {
903 /* timeout */
904 /* The reason we don't call SSL_CTX_remove_session() is to
905 * save on locking overhead */
906 (void)lh_SSL_SESSION_delete(p->cache, s);
907 SSL_SESSION_list_remove(p->ctx, s);
908 s->not_resumable = 1;
909 if (p->ctx->remove_session_cb != NULL)
910 p->ctx->remove_session_cb(p->ctx, s);
911 SSL_SESSION_free(s);
912 }
913}
914
915static
916IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM)
917
918/* XXX 2038 */
919void
920SSL_CTX_flush_sessions(SSL_CTX *s, long t)
921{
922 unsigned long i;
923 TIMEOUT_PARAM tp;
924
925 tp.ctx = s;
926 tp.cache = s->sessions;
927 if (tp.cache == NULL)
928 return;
929 tp.time = t;
930 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
931 i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load;
932 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0;
933 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout),
934 TIMEOUT_PARAM, &tp);
935 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i;
936 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
937}
938
939int
940ssl_clear_bad_session(SSL *s)
941{
942 if ((s->session != NULL) && !(s->shutdown & SSL_SENT_SHUTDOWN) &&
943 !(SSL_in_init(s) || SSL_in_before(s))) {
944 SSL_CTX_remove_session(s->ctx, s->session);
945 return (1);
946 } else
947 return (0);
948}
949
950/* locked by SSL_CTX in the calling function */
951static void
952SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
953{
954 if ((s->next == NULL) || (s->prev == NULL))
955 return;
956
957 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
958 /* last element in list */
959 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
960 /* only one element in list */
961 ctx->session_cache_head = NULL;
962 ctx->session_cache_tail = NULL;
963 } else {
964 ctx->session_cache_tail = s->prev;
965 s->prev->next =
966 (SSL_SESSION *)&(ctx->session_cache_tail);
967 }
968 } else {
969 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
970 /* first element in list */
971 ctx->session_cache_head = s->next;
972 s->next->prev =
973 (SSL_SESSION *)&(ctx->session_cache_head);
974 } else {
975 /* middle of list */
976 s->next->prev = s->prev;
977 s->prev->next = s->next;
978 }
979 }
980 s->prev = s->next = NULL;
981}
982
983static void
984SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
985{
986 if ((s->next != NULL) && (s->prev != NULL))
987 SSL_SESSION_list_remove(ctx, s);
988
989 if (ctx->session_cache_head == NULL) {
990 ctx->session_cache_head = s;
991 ctx->session_cache_tail = s;
992 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
993 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
994 } else {
995 s->next = ctx->session_cache_head;
996 s->next->prev = s;
997 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
998 ctx->session_cache_head = s;
999 }
1000}
1001
1002void
1003SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1004 int (*cb)(struct ssl_st *ssl, SSL_SESSION *sess)) {
1005 ctx->new_session_cb = cb;
1006}
1007
1008int
1009(*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
1010{
1011 return ctx->new_session_cb;
1012}
1013
1014void
1015SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1016 void (*cb)(SSL_CTX *ctx, SSL_SESSION *sess))
1017{
1018 ctx->remove_session_cb = cb;
1019}
1020
1021void
1022(*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx, SSL_SESSION *sess)
1023{
1024 return ctx->remove_session_cb;
1025}
1026
1027void
1028SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, SSL_SESSION *(*cb)(struct ssl_st *ssl,
1029 unsigned char *data, int len, int *copy))
1030{
1031 ctx->get_session_cb = cb;
1032}
1033
1034SSL_SESSION *
1035(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, unsigned char *data,
1036 int len, int *copy)
1037{
1038 return ctx->get_session_cb;
1039}
1040
1041void
1042SSL_CTX_set_info_callback(SSL_CTX *ctx,
1043 void (*cb)(const SSL *ssl, int type, int val))
1044{
1045 ctx->info_callback = cb;
1046}
1047
1048void
1049(*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type, int val)
1050{
1051 return ctx->info_callback;
1052}
1053
1054void
1055SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1056 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
1057{
1058 ctx->client_cert_cb = cb;
1059}
1060
1061int
1062(*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509,
1063 EVP_PKEY **pkey)
1064{
1065 return ctx->client_cert_cb;
1066}
1067
1068#ifndef OPENSSL_NO_ENGINE
1069int
1070SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1071{
1072 if (!ENGINE_init(e)) {
1073 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
1074 ERR_R_ENGINE_LIB);
1075 return 0;
1076 }
1077 if (!ENGINE_get_ssl_client_cert_function(e)) {
1078 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
1079 SSL_R_NO_CLIENT_CERT_METHOD);
1080 ENGINE_finish(e);
1081 return 0;
1082 }
1083 ctx->client_cert_engine = e;
1084 return 1;
1085}
1086#endif
1087
1088void
1089SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1090 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
1091{
1092 ctx->app_gen_cookie_cb = cb;
1093}
1094
1095void
1096SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1097 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
1098{
1099 ctx->app_verify_cookie_cb = cb;
1100}
1101
1102IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-20 01:58:12 +0000