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1/* $OpenBSD: ssl_sess.c,v 1.48 2015/09/10 17:57:50 jsing 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 TLS1_VERSION:
304 case TLS1_1_VERSION:
305 case TLS1_2_VERSION:
306 case DTLS1_VERSION:
307 ss->ssl_version = s->version;
308 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
309 break;
310 default:
311 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
312 SSL_R_UNSUPPORTED_SSL_VERSION);
313 SSL_SESSION_free(ss);
314 return (0);
315 }
316
317 /* If RFC4507 ticket use empty session ID. */
318 if (s->tlsext_ticket_expected) {
319 ss->session_id_length = 0;
320 goto sess_id_done;
321 }
322
323 /* Choose which callback will set the session ID. */
324 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
325 if (s->generate_session_id)
326 cb = s->generate_session_id;
327 else if (s->session_ctx->generate_session_id)
328 cb = s->session_ctx->generate_session_id;
329 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
330
331 /* Choose a session ID. */
332 tmp = ss->session_id_length;
333 if (!cb(s, ss->session_id, &tmp)) {
334 /* The callback failed */
335 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
336 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
337 SSL_SESSION_free(ss);
338 return (0);
339 }
340
341 /*
342 * Don't allow the callback to set the session length to zero.
343 * nor set it higher than it was.
344 */
345 if (!tmp || (tmp > ss->session_id_length)) {
346 /* The callback set an illegal length */
347 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
348 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
349 SSL_SESSION_free(ss);
350 return (0);
351 }
352 ss->session_id_length = tmp;
353
354 /* Finally, check for a conflict. */
355 if (SSL_has_matching_session_id(s, ss->session_id,
356 ss->session_id_length)) {
357 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
358 SSL_R_SSL_SESSION_ID_CONFLICT);
359 SSL_SESSION_free(ss);
360 return (0);
361 }
362
363sess_id_done:
364 if (s->tlsext_hostname) {
365 ss->tlsext_hostname = strdup(s->tlsext_hostname);
366 if (ss->tlsext_hostname == NULL) {
367 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
368 ERR_R_INTERNAL_ERROR);
369 SSL_SESSION_free(ss);
370 return 0;
371 }
372 }
373 } else {
374 ss->session_id_length = 0;
375 }
376
377 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
378 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
379 SSL_SESSION_free(ss);
380 return 0;
381 }
382
383 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
384 ss->sid_ctx_length = s->sid_ctx_length;
385 s->session = ss;
386 ss->ssl_version = s->version;
387 ss->verify_result = X509_V_OK;
388
389 return (1);
390}
391
392/*
393 * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
394 * connection. It is only called by servers.
395 *
396 * session_id: points at the session ID in the ClientHello. This code will
397 * read past the end of this in order to parse out the session ticket
398 * extension, if any.
399 * len: the length of the session ID.
400 * limit: a pointer to the first byte after the ClientHello.
401 *
402 * Returns:
403 * -1: error
404 * 0: a session may have been found.
405 *
406 * Side effects:
407 * - If a session is found then s->session is pointed at it (after freeing
408 * an existing session if need be) and s->verify_result is set from the
409 * session.
410 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set
411 * to 1 if the server should issue a new session ticket (to 0 otherwise).
412 */
413int
414ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
415 const unsigned char *limit)
416{
417 SSL_SESSION *ret = NULL;
418 int fatal = 0;
419 int try_session_cache = 1;
420 int r;
421
422 /* This is used only by servers. */
423
424 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
425 goto err;
426
427 if (len == 0)
428 try_session_cache = 0;
429
430 /* Sets s->tlsext_ticket_expected. */
431 r = tls1_process_ticket(s, session_id, len, limit, &ret);
432 switch (r) {
433 case -1: /* Error during processing */
434 fatal = 1;
435 goto err;
436 case 0: /* No ticket found */
437 case 1: /* Zero length ticket found */
438 break; /* Ok to carry on processing session id. */
439 case 2: /* Ticket found but not decrypted. */
440 case 3: /* Ticket decrypted, *ret has been set. */
441 try_session_cache = 0;
442 break;
443 default:
444 abort();
445 }
446
447 if (try_session_cache && ret == NULL &&
448 !(s->session_ctx->session_cache_mode &
449 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
450 SSL_SESSION data;
451 data.ssl_version = s->version;
452 data.session_id_length = len;
453 memcpy(data.session_id, session_id, len);
454
455 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
456 ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
457 if (ret != NULL) {
458 /* Don't allow other threads to steal it. */
459 CRYPTO_add(&ret->references, 1,
460 CRYPTO_LOCK_SSL_SESSION);
461 }
462 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
463
464 if (ret == NULL)
465 s->session_ctx->stats.sess_miss++;
466 }
467
468 if (try_session_cache && ret == NULL &&
469 s->session_ctx->get_session_cb != NULL) {
470 int copy = 1;
471
472 if ((ret = s->session_ctx->get_session_cb(s, session_id,
473 len, &copy))) {
474 s->session_ctx->stats.sess_cb_hit++;
475
476 /*
477 * Increment reference count now if the session
478 * callback asks us to do so (note that if the session
479 * structures returned by the callback are shared
480 * between threads, it must handle the reference count
481 * itself [i.e. copy == 0], or things won't be
482 * thread-safe).
483 */
484 if (copy)
485 CRYPTO_add(&ret->references, 1,
486 CRYPTO_LOCK_SSL_SESSION);
487
488 /*
489 * Add the externally cached session to the internal
490 * cache as well if and only if we are supposed to.
491 */
492 if (!(s->session_ctx->session_cache_mode &
493 SSL_SESS_CACHE_NO_INTERNAL_STORE))
494 /*
495 * The following should not return 1,
496 * otherwise, things are very strange.
497 */
498 SSL_CTX_add_session(s->session_ctx, ret);
499 }
500 }
501
502 if (ret == NULL)
503 goto err;
504
505 /* Now ret is non-NULL and we own one of its reference counts. */
506
507 if (ret->sid_ctx_length != s->sid_ctx_length ||
508 timingsafe_memcmp(ret->sid_ctx,
509 s->sid_ctx, ret->sid_ctx_length) != 0) {
510 /* We have the session requested by the client, but we don't
511 * want to use it in this context. */
512 goto err; /* treat like cache miss */
513 }
514
515 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
516 /*
517 * We can't be sure if this session is being used out of
518 * context, which is especially important for SSL_VERIFY_PEER.
519 * The application should have used
520 * SSL[_CTX]_set_session_id_context.
521 *
522 * For this error case, we generate an error instead of treating
523 * the event like a cache miss (otherwise it would be easy for
524 * applications to effectively disable the session cache by
525 * accident without anyone noticing).
526 */
527 SSLerr(SSL_F_SSL_GET_PREV_SESSION,
528 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
529 fatal = 1;
530 goto err;
531 }
532
533 if (ret->cipher == NULL) {
534 ret->cipher = ssl3_get_cipher_by_id(ret->cipher_id);
535 if (ret->cipher == NULL)
536 goto err;
537 }
538
539 if (ret->timeout < (time(NULL) - ret->time)) {
540 /* timeout */
541 s->session_ctx->stats.sess_timeout++;
542 if (try_session_cache) {
543 /* session was from the cache, so remove it */
544 SSL_CTX_remove_session(s->session_ctx, ret);
545 }
546 goto err;
547 }
548
549 s->session_ctx->stats.sess_hit++;
550
551 if (s->session != NULL)
552 SSL_SESSION_free(s->session);
553 s->session = ret;
554 s->verify_result = s->session->verify_result;
555 return 1;
556
557err:
558 if (ret != NULL) {
559 SSL_SESSION_free(ret);
560 if (!try_session_cache) {
561 /*
562 * The session was from a ticket, so we should
563 * issue a ticket for the new session.
564 */
565 s->tlsext_ticket_expected = 1;
566 }
567 }
568 if (fatal)
569 return -1;
570 else
571 return 0;
572}
573
574int
575SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
576{
577 int ret = 0;
578 SSL_SESSION *s;
579
580 /*
581 * Add just 1 reference count for the SSL_CTX's session cache
582 * even though it has two ways of access: each session is in a
583 * doubly linked list and an lhash.
584 */
585 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
586
587 /*
588 * If session c is in already in cache, we take back the increment
589 * later.
590 */
591 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
592 s = lh_SSL_SESSION_insert(ctx->sessions, c);
593
594 /*
595 * s != NULL iff we already had a session with the given PID.
596 * In this case, s == c should hold (then we did not really modify
597 * ctx->sessions), or we're in trouble.
598 */
599 if (s != NULL && s != c) {
600 /* We *are* in trouble ... */
601 SSL_SESSION_list_remove(ctx, s);
602 SSL_SESSION_free(s);
603 /*
604 * ... so pretend the other session did not exist in cache
605 * (we cannot handle two SSL_SESSION structures with identical
606 * session ID in the same cache, which could happen e.g. when
607 * two threads concurrently obtain the same session from an
608 * external cache).
609 */
610 s = NULL;
611 }
612
613 /* Put at the head of the queue unless it is already in the cache */
614 if (s == NULL)
615 SSL_SESSION_list_add(ctx, c);
616
617 if (s != NULL) {
618 /*
619 * existing cache entry -- decrement previously incremented
620 * reference count because it already takes into account the
621 * cache.
622 */
623 SSL_SESSION_free(s); /* s == c */
624 ret = 0;
625 } else {
626 /*
627 * New cache entry -- remove old ones if cache has become
628 * too large.
629 */
630
631 ret = 1;
632
633 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
634 while (SSL_CTX_sess_number(ctx) >
635 SSL_CTX_sess_get_cache_size(ctx)) {
636 if (!remove_session_lock(ctx,
637 ctx->session_cache_tail, 0))
638 break;
639 else
640 ctx->stats.sess_cache_full++;
641 }
642 }
643 }
644 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
645 return (ret);
646}
647
648int
649SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
650{
651 return remove_session_lock(ctx, c, 1);
652}
653
654static int
655remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
656{
657 SSL_SESSION *r;
658 int ret = 0;
659
660 if ((c != NULL) && (c->session_id_length != 0)) {
661 if (lck)
662 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
663 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
664 ret = 1;
665 r = lh_SSL_SESSION_delete(ctx->sessions, c);
666 SSL_SESSION_list_remove(ctx, c);
667 }
668 if (lck)
669 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
670
671 if (ret) {
672 r->not_resumable = 1;
673 if (ctx->remove_session_cb != NULL)
674 ctx->remove_session_cb(ctx, r);
675 SSL_SESSION_free(r);
676 }
677 } else
678 ret = 0;
679 return (ret);
680}
681
682void
683SSL_SESSION_free(SSL_SESSION *ss)
684{
685 int i;
686
687 if (ss == NULL)
688 return;
689
690 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
691 if (i > 0)
692 return;
693
694 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
695
696 explicit_bzero(ss->master_key, sizeof ss->master_key);
697 explicit_bzero(ss->session_id, sizeof ss->session_id);
698 if (ss->sess_cert != NULL)
699 ssl_sess_cert_free(ss->sess_cert);
700 if (ss->peer != NULL)
701 X509_free(ss->peer);
702 if (ss->ciphers != NULL)
703 sk_SSL_CIPHER_free(ss->ciphers);
704 free(ss->tlsext_hostname);
705 free(ss->tlsext_tick);
706 ss->tlsext_ecpointformatlist_length = 0;
707 free(ss->tlsext_ecpointformatlist);
708 ss->tlsext_ellipticcurvelist_length = 0;
709 free(ss->tlsext_ellipticcurvelist);
710 explicit_bzero(ss, sizeof(*ss));
711 free(ss);
712}
713
714int
715SSL_set_session(SSL *s, SSL_SESSION *session)
716{
717 int ret = 0;
718 const SSL_METHOD *meth;
719
720 if (session != NULL) {
721 meth = s->ctx->method->get_ssl_method(session->ssl_version);
722 if (meth == NULL)
723 meth = s->method->get_ssl_method(session->ssl_version);
724 if (meth == NULL) {
725 SSLerr(SSL_F_SSL_SET_SESSION,
726 SSL_R_UNABLE_TO_FIND_SSL_METHOD);
727 return (0);
728 }
729
730 if (meth != s->method) {
731 if (!SSL_set_ssl_method(s, meth))
732 return (0);
733 }
734
735
736 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
737 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
738 if (s->session != NULL)
739 SSL_SESSION_free(s->session);
740 s->session = session;
741 s->verify_result = s->session->verify_result;
742 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
743 ret = 1;
744 } else {
745 if (s->session != NULL) {
746 SSL_SESSION_free(s->session);
747 s->session = NULL;
748 }
749
750 meth = s->ctx->method;
751 if (meth != s->method) {
752 if (!SSL_set_ssl_method(s, meth))
753 return (0);
754 }
755 ret = 1;
756 }
757 return (ret);
758}
759
760long
761SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
762{
763 if (s == NULL)
764 return (0);
765 s->timeout = t;
766 return (1);
767}
768
769long
770SSL_SESSION_get_timeout(const SSL_SESSION *s)
771{
772 if (s == NULL)
773 return (0);
774 return (s->timeout);
775}
776
777/* XXX 2038 */
778long
779SSL_SESSION_get_time(const SSL_SESSION *s)
780{
781 if (s == NULL)
782 return (0);
783 return (s->time);
784}
785
786/* XXX 2038 */
787long
788SSL_SESSION_set_time(SSL_SESSION *s, long t)
789{
790 if (s == NULL)
791 return (0);
792 s->time = t;
793 return (t);
794}
795
796X509 *
797SSL_SESSION_get0_peer(SSL_SESSION *s)
798{
799 return s->peer;
800}
801
802int
803SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
804 unsigned int sid_ctx_len)
805{
806 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
807 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,
808 SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
809 return 0;
810 }
811 s->sid_ctx_length = sid_ctx_len;
812 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
813
814 return 1;
815}
816
817long
818SSL_CTX_set_timeout(SSL_CTX *s, long t)
819{
820 long l;
821
822 if (s == NULL)
823 return (0);
824 l = s->session_timeout;
825 s->session_timeout = t;
826
827 return (l);
828}
829
830long
831SSL_CTX_get_timeout(const SSL_CTX *s)
832{
833 if (s == NULL)
834 return (0);
835 return (s->session_timeout);
836}
837
838int
839SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s,
840 void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers,
841 SSL_CIPHER **cipher, void *arg), void *arg)
842{
843 if (s == NULL)
844 return (0);
845 s->tls_session_secret_cb = tls_session_secret_cb;
846 s->tls_session_secret_cb_arg = arg;
847 return (1);
848}
849
850int
851SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
852 void *arg)
853{
854 if (s == NULL)
855 return (0);
856 s->tls_session_ticket_ext_cb = cb;
857 s->tls_session_ticket_ext_cb_arg = arg;
858 return (1);
859}
860
861int
862SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
863{
864 if (s->version >= TLS1_VERSION) {
865 free(s->tlsext_session_ticket);
866 s->tlsext_session_ticket =
867 malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
868 if (!s->tlsext_session_ticket) {
869 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT,
870 ERR_R_MALLOC_FAILURE);
871 return 0;
872 }
873
874 if (ext_data) {
875 s->tlsext_session_ticket->length = ext_len;
876 s->tlsext_session_ticket->data =
877 s->tlsext_session_ticket + 1;
878 memcpy(s->tlsext_session_ticket->data,
879 ext_data, ext_len);
880 } else {
881 s->tlsext_session_ticket->length = 0;
882 s->tlsext_session_ticket->data = NULL;
883 }
884
885 return 1;
886 }
887
888 return 0;
889}
890
891typedef struct timeout_param_st {
892 SSL_CTX *ctx;
893 long time;
894 LHASH_OF(SSL_SESSION) *cache;
895} TIMEOUT_PARAM;
896
897static void
898timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p)
899{
900 if ((p->time == 0) || (p->time > (s->time + s->timeout))) {
901 /* timeout */
902 /* The reason we don't call SSL_CTX_remove_session() is to
903 * save on locking overhead */
904 (void)lh_SSL_SESSION_delete(p->cache, s);
905 SSL_SESSION_list_remove(p->ctx, s);
906 s->not_resumable = 1;
907 if (p->ctx->remove_session_cb != NULL)
908 p->ctx->remove_session_cb(p->ctx, s);
909 SSL_SESSION_free(s);
910 }
911}
912
913static
914IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM)
915
916/* XXX 2038 */
917void
918SSL_CTX_flush_sessions(SSL_CTX *s, long t)
919{
920 unsigned long i;
921 TIMEOUT_PARAM tp;
922
923 tp.ctx = s;
924 tp.cache = s->sessions;
925 if (tp.cache == NULL)
926 return;
927 tp.time = t;
928 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
929 i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load;
930 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0;
931 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout),
932 TIMEOUT_PARAM, &tp);
933 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i;
934 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
935}
936
937int
938ssl_clear_bad_session(SSL *s)
939{
940 if ((s->session != NULL) && !(s->shutdown & SSL_SENT_SHUTDOWN) &&
941 !(SSL_in_init(s) || SSL_in_before(s))) {
942 SSL_CTX_remove_session(s->ctx, s->session);
943 return (1);
944 } else
945 return (0);
946}
947
948/* locked by SSL_CTX in the calling function */
949static void
950SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
951{
952 if ((s->next == NULL) || (s->prev == NULL))
953 return;
954
955 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
956 /* last element in list */
957 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
958 /* only one element in list */
959 ctx->session_cache_head = NULL;
960 ctx->session_cache_tail = NULL;
961 } else {
962 ctx->session_cache_tail = s->prev;
963 s->prev->next =
964 (SSL_SESSION *)&(ctx->session_cache_tail);
965 }
966 } else {
967 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
968 /* first element in list */
969 ctx->session_cache_head = s->next;
970 s->next->prev =
971 (SSL_SESSION *)&(ctx->session_cache_head);
972 } else {
973 /* middle of list */
974 s->next->prev = s->prev;
975 s->prev->next = s->next;
976 }
977 }
978 s->prev = s->next = NULL;
979}
980
981static void
982SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
983{
984 if ((s->next != NULL) && (s->prev != NULL))
985 SSL_SESSION_list_remove(ctx, s);
986
987 if (ctx->session_cache_head == NULL) {
988 ctx->session_cache_head = s;
989 ctx->session_cache_tail = s;
990 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
991 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
992 } else {
993 s->next = ctx->session_cache_head;
994 s->next->prev = s;
995 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
996 ctx->session_cache_head = s;
997 }
998}
999
1000void
1001SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1002 int (*cb)(struct ssl_st *ssl, SSL_SESSION *sess)) {
1003 ctx->new_session_cb = cb;
1004}
1005
1006int
1007(*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
1008{
1009 return ctx->new_session_cb;
1010}
1011
1012void
1013SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1014 void (*cb)(SSL_CTX *ctx, SSL_SESSION *sess))
1015{
1016 ctx->remove_session_cb = cb;
1017}
1018
1019void
1020(*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx, SSL_SESSION *sess)
1021{
1022 return ctx->remove_session_cb;
1023}
1024
1025void
1026SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, SSL_SESSION *(*cb)(struct ssl_st *ssl,
1027 unsigned char *data, int len, int *copy))
1028{
1029 ctx->get_session_cb = cb;
1030}
1031
1032SSL_SESSION *
1033(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, unsigned char *data,
1034 int len, int *copy)
1035{
1036 return ctx->get_session_cb;
1037}
1038
1039void
1040SSL_CTX_set_info_callback(SSL_CTX *ctx,
1041 void (*cb)(const SSL *ssl, int type, int val))
1042{
1043 ctx->info_callback = cb;
1044}
1045
1046void
1047(*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type, int val)
1048{
1049 return ctx->info_callback;
1050}
1051
1052void
1053SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1054 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
1055{
1056 ctx->client_cert_cb = cb;
1057}
1058
1059int
1060(*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509,
1061 EVP_PKEY **pkey)
1062{
1063 return ctx->client_cert_cb;
1064}
1065
1066#ifndef OPENSSL_NO_ENGINE
1067int
1068SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1069{
1070 if (!ENGINE_init(e)) {
1071 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
1072 ERR_R_ENGINE_LIB);
1073 return 0;
1074 }
1075 if (!ENGINE_get_ssl_client_cert_function(e)) {
1076 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE,
1077 SSL_R_NO_CLIENT_CERT_METHOD);
1078 ENGINE_finish(e);
1079 return 0;
1080 }
1081 ctx->client_cert_engine = e;
1082 return 1;
1083}
1084#endif
1085
1086void
1087SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1088 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
1089{
1090 ctx->app_gen_cookie_cb = cb;
1091}
1092
1093void
1094SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1095 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
1096{
1097 ctx->app_verify_cookie_cb = cb;
1098}
1099
1100IMPLEMENT_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 2025-12-24 19:07:25 +0000