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1/* $OpenBSD: ssl_sess.c,v 1.104 2021/05/16 08:24:21 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#include <openssl/opensslconf.h>
140
141#ifndef OPENSSL_NO_ENGINE
142#include <openssl/engine.h>
143#endif
144
145#include "ssl_locl.h"
146
147static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
148static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s);
149static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
150
151/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
152SSL_SESSION *
153SSL_get_session(const SSL *ssl)
154{
155 return (ssl->session);
156}
157
158/* variant of SSL_get_session: caller really gets something */
159SSL_SESSION *
160SSL_get1_session(SSL *ssl)
161{
162 SSL_SESSION *sess;
163
164 /*
165 * Need to lock this all up rather than just use CRYPTO_add so that
166 * somebody doesn't free ssl->session between when we check it's
167 * non-null and when we up the reference count.
168 */
169 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
170 sess = ssl->session;
171 if (sess)
172 sess->references++;
173 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
174
175 return (sess);
176}
177
178int
179SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
180 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
181{
182 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION,
183 argl, argp, new_func, dup_func, free_func);
184}
185
186int
187SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
188{
189 return (CRYPTO_set_ex_data(&s->internal->ex_data, idx, arg));
190}
191
192void *
193SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
194{
195 return (CRYPTO_get_ex_data(&s->internal->ex_data, idx));
196}
197
198uint32_t
199SSL_SESSION_get_max_early_data(const SSL_SESSION *s)
200{
201 return 0;
202}
203
204int
205SSL_SESSION_set_max_early_data(SSL_SESSION *s, uint32_t max_early_data)
206{
207 return 1;
208}
209
210SSL_SESSION *
211SSL_SESSION_new(void)
212{
213 SSL_SESSION *ss;
214
215 if (!OPENSSL_init_ssl(0, NULL)) {
216 SSLerrorx(SSL_R_LIBRARY_BUG);
217 return(NULL);
218 }
219
220 if ((ss = calloc(1, sizeof(*ss))) == NULL) {
221 SSLerrorx(ERR_R_MALLOC_FAILURE);
222 return (NULL);
223 }
224 if ((ss->internal = calloc(1, sizeof(*ss->internal))) == NULL) {
225 free(ss);
226 SSLerrorx(ERR_R_MALLOC_FAILURE);
227 return (NULL);
228 }
229
230 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
231 ss->references = 1;
232 ss->timeout=60*5+4; /* 5 minute timeout by default */
233 ss->time = time(NULL);
234 ss->internal->prev = NULL;
235 ss->internal->next = NULL;
236 ss->tlsext_hostname = NULL;
237
238 ss->internal->tlsext_ecpointformatlist_length = 0;
239 ss->internal->tlsext_ecpointformatlist = NULL;
240 ss->internal->tlsext_supportedgroups_length = 0;
241 ss->internal->tlsext_supportedgroups = NULL;
242
243 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->internal->ex_data);
244
245 return (ss);
246}
247
248const unsigned char *
249SSL_SESSION_get_id(const SSL_SESSION *ss, unsigned int *len)
250{
251 if (len != NULL)
252 *len = ss->session_id_length;
253 return ss->session_id;
254}
255
256const unsigned char *
257SSL_SESSION_get0_id_context(const SSL_SESSION *ss, unsigned int *len)
258{
259 if (len != NULL)
260 *len = (unsigned int)ss->sid_ctx_length;
261 return ss->sid_ctx;
262}
263
264unsigned int
265SSL_SESSION_get_compress_id(const SSL_SESSION *ss)
266{
267 return 0;
268}
269
270unsigned long
271SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
272{
273 return s->tlsext_tick_lifetime_hint;
274}
275
276int
277SSL_SESSION_has_ticket(const SSL_SESSION *s)
278{
279 return (s->tlsext_ticklen > 0) ? 1 : 0;
280}
281
282/*
283 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
284 * the ID with random gunk repeatedly until we have no conflict is going to
285 * complete in one iteration pretty much "most" of the time (btw:
286 * understatement). So, if it takes us 10 iterations and we still can't avoid
287 * a conflict - well that's a reasonable point to call it quits. Either the
288 * arc4random code is broken or someone is trying to open roughly very close to
289 * 2^128 (or 2^256) SSL sessions to our server. How you might store that many
290 * sessions is perhaps a more interesting question...
291 */
292
293#define MAX_SESS_ID_ATTEMPTS 10
294
295static int
296def_generate_session_id(const SSL *ssl, unsigned char *id, unsigned int *id_len)
297{
298 unsigned int retry = 0;
299
300 do {
301 arc4random_buf(id, *id_len);
302 } while (SSL_has_matching_session_id(ssl, id, *id_len) &&
303 (++retry < MAX_SESS_ID_ATTEMPTS));
304
305 if (retry < MAX_SESS_ID_ATTEMPTS)
306 return 1;
307
308 /* else - woops a session_id match */
309 /* XXX We should also check the external cache --
310 * but the probability of a collision is negligible, and
311 * we could not prevent the concurrent creation of sessions
312 * with identical IDs since we currently don't have means
313 * to atomically check whether a session ID already exists
314 * and make a reservation for it if it does not
315 * (this problem applies to the internal cache as well).
316 */
317 return 0;
318}
319
320int
321ssl_get_new_session(SSL *s, int session)
322{
323 unsigned int tmp;
324 SSL_SESSION *ss = NULL;
325 GEN_SESSION_CB cb = def_generate_session_id;
326
327 /* This gets used by clients and servers. */
328
329 if ((ss = SSL_SESSION_new()) == NULL)
330 return (0);
331
332 /* If the context has a default timeout, use it */
333 if (s->session_ctx->session_timeout == 0)
334 ss->timeout = SSL_get_default_timeout(s);
335 else
336 ss->timeout = s->session_ctx->session_timeout;
337
338 if (s->session != NULL) {
339 SSL_SESSION_free(s->session);
340 s->session = NULL;
341 }
342
343 if (session) {
344 switch (s->version) {
345 case TLS1_VERSION:
346 case TLS1_1_VERSION:
347 case TLS1_2_VERSION:
348 case DTLS1_VERSION:
349 case DTLS1_2_VERSION:
350 ss->ssl_version = s->version;
351 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
352 break;
353 default:
354 SSLerror(s, SSL_R_UNSUPPORTED_SSL_VERSION);
355 SSL_SESSION_free(ss);
356 return (0);
357 }
358
359 /* If RFC4507 ticket use empty session ID. */
360 if (s->internal->tlsext_ticket_expected) {
361 ss->session_id_length = 0;
362 goto sess_id_done;
363 }
364
365 /* Choose which callback will set the session ID. */
366 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
367 if (s->internal->generate_session_id)
368 cb = s->internal->generate_session_id;
369 else if (s->session_ctx->internal->generate_session_id)
370 cb = s->session_ctx->internal->generate_session_id;
371 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
372
373 /* Choose a session ID. */
374 tmp = ss->session_id_length;
375 if (!cb(s, ss->session_id, &tmp)) {
376 /* The callback failed */
377 SSLerror(s, SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
378 SSL_SESSION_free(ss);
379 return (0);
380 }
381
382 /*
383 * Don't allow the callback to set the session length to zero.
384 * nor set it higher than it was.
385 */
386 if (!tmp || (tmp > ss->session_id_length)) {
387 /* The callback set an illegal length */
388 SSLerror(s, SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
389 SSL_SESSION_free(ss);
390 return (0);
391 }
392 ss->session_id_length = tmp;
393
394 /* Finally, check for a conflict. */
395 if (SSL_has_matching_session_id(s, ss->session_id,
396 ss->session_id_length)) {
397 SSLerror(s, SSL_R_SSL_SESSION_ID_CONFLICT);
398 SSL_SESSION_free(ss);
399 return (0);
400 }
401
402 sess_id_done:
403 if (s->tlsext_hostname) {
404 ss->tlsext_hostname = strdup(s->tlsext_hostname);
405 if (ss->tlsext_hostname == NULL) {
406 SSLerror(s, ERR_R_INTERNAL_ERROR);
407 SSL_SESSION_free(ss);
408 return 0;
409 }
410 }
411 } else {
412 ss->session_id_length = 0;
413 }
414
415 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
416 SSLerror(s, ERR_R_INTERNAL_ERROR);
417 SSL_SESSION_free(ss);
418 return 0;
419 }
420
421 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
422 ss->sid_ctx_length = s->sid_ctx_length;
423 s->session = ss;
424 ss->ssl_version = s->version;
425 ss->verify_result = X509_V_OK;
426
427 return (1);
428}
429
430static SSL_SESSION *
431ssl_session_from_cache(SSL *s, CBS *session_id)
432{
433 SSL_SESSION *sess;
434 SSL_SESSION data;
435
436 if ((s->session_ctx->internal->session_cache_mode &
437 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
438 return NULL;
439
440 memset(&data, 0, sizeof(data));
441
442 data.ssl_version = s->version;
443 data.session_id_length = CBS_len(session_id);
444 memcpy(data.session_id, CBS_data(session_id), CBS_len(session_id));
445
446 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
447 sess = lh_SSL_SESSION_retrieve(s->session_ctx->internal->sessions, &data);
448 if (sess != NULL)
449 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
450 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
451
452 if (sess == NULL)
453 s->session_ctx->internal->stats.sess_miss++;
454
455 return sess;
456}
457
458static SSL_SESSION *
459ssl_session_from_callback(SSL *s, CBS *session_id)
460{
461 SSL_SESSION *sess;
462 int copy;
463
464 if (s->session_ctx->internal->get_session_cb == NULL)
465 return NULL;
466
467 copy = 1;
468 if ((sess = s->session_ctx->internal->get_session_cb(s,
469 CBS_data(session_id), CBS_len(session_id), &copy)) == NULL)
470 return NULL;
471 /*
472 * The copy handler may have set copy == 0 to indicate that the session
473 * structures are shared between threads and that it handles the
474 * reference count itself. If it didn't set copy to zero, we must
475 * increment the reference count.
476 */
477 if (copy)
478 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
479
480 s->session_ctx->internal->stats.sess_cb_hit++;
481
482 /* Add the externally cached session to the internal cache as well. */
483 if (!(s->session_ctx->internal->session_cache_mode &
484 SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
485 /*
486 * The following should not return 1,
487 * otherwise, things are very strange.
488 */
489 SSL_CTX_add_session(s->session_ctx, sess);
490 }
491
492 return sess;
493}
494
495static SSL_SESSION *
496ssl_session_by_id(SSL *s, CBS *session_id)
497{
498 SSL_SESSION *sess;
499
500 if (CBS_len(session_id) == 0)
501 return NULL;
502
503 if ((sess = ssl_session_from_cache(s, session_id)) == NULL)
504 sess = ssl_session_from_callback(s, session_id);
505
506 return sess;
507}
508
509/*
510 * ssl_get_prev_session attempts to find an SSL_SESSION to be used to resume
511 * this connection. It is only called by servers.
512 *
513 * session_id: points at the session ID in the ClientHello. This code will
514 * read past the end of this in order to parse out the session ticket
515 * extension, if any.
516 * ext_block: a CBS for the ClientHello extensions block.
517 * alert: alert that the caller should send in case of failure.
518 *
519 * Returns:
520 * -1: error
521 * 0: a session may have been found.
522 *
523 * Side effects:
524 * - If a session is found then s->session is pointed at it (after freeing
525 * an existing session if need be) and s->verify_result is set from the
526 * session.
527 * - For both new and resumed sessions, s->internal->tlsext_ticket_expected
528 * indicates whether the server should issue a new session ticket or not.
529 */
530int
531ssl_get_prev_session(SSL *s, CBS *session_id, CBS *ext_block, int *alert)
532{
533 SSL_SESSION *sess = NULL;
534 size_t session_id_len;
535 int alert_desc = SSL_AD_INTERNAL_ERROR, fatal = 0;
536 int ticket_decrypted = 0;
537
538 /* This is used only by servers. */
539
540 if (CBS_len(session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH)
541 goto err;
542
543 /* Sets s->internal->tlsext_ticket_expected. */
544 switch (tls1_process_ticket(s, ext_block, &alert_desc, &sess)) {
545 case TLS1_TICKET_FATAL_ERROR:
546 fatal = 1;
547 goto err;
548 case TLS1_TICKET_NONE:
549 case TLS1_TICKET_EMPTY:
550 if ((sess = ssl_session_by_id(s, session_id)) == NULL)
551 goto err;
552 break;
553 case TLS1_TICKET_NOT_DECRYPTED:
554 goto err;
555 case TLS1_TICKET_DECRYPTED:
556 ticket_decrypted = 1;
557
558 /*
559 * The session ID is used by some clients to detect that the
560 * ticket has been accepted so we copy it into sess.
561 */
562 if (!CBS_write_bytes(session_id, sess->session_id,
563 sizeof(sess->session_id), &session_id_len)) {
564 fatal = 1;
565 goto err;
566 }
567 sess->session_id_length = (unsigned int)session_id_len;
568 break;
569 default:
570 SSLerror(s, ERR_R_INTERNAL_ERROR);
571 fatal = 1;
572 goto err;
573 }
574
575 /* Now sess is non-NULL and we own one of its reference counts. */
576
577 if (sess->sid_ctx_length != s->sid_ctx_length ||
578 timingsafe_memcmp(sess->sid_ctx, s->sid_ctx,
579 sess->sid_ctx_length) != 0) {
580 /*
581 * We have the session requested by the client, but we don't
582 * want to use it in this context. Treat it like a cache miss.
583 */
584 goto err;
585 }
586
587 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
588 /*
589 * We can't be sure if this session is being used out of
590 * context, which is especially important for SSL_VERIFY_PEER.
591 * The application should have used
592 * SSL[_CTX]_set_session_id_context.
593 *
594 * For this error case, we generate an error instead of treating
595 * the event like a cache miss (otherwise it would be easy for
596 * applications to effectively disable the session cache by
597 * accident without anyone noticing).
598 */
599 SSLerror(s, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
600 fatal = 1;
601 goto err;
602 }
603
604 if (sess->cipher == NULL) {
605 sess->cipher = ssl3_get_cipher_by_id(sess->cipher_id);
606 if (sess->cipher == NULL)
607 goto err;
608 }
609
610 if (sess->timeout < (time(NULL) - sess->time)) {
611 s->session_ctx->internal->stats.sess_timeout++;
612 if (!ticket_decrypted) {
613 /* The session was from the cache, so remove it. */
614 SSL_CTX_remove_session(s->session_ctx, sess);
615 }
616 goto err;
617 }
618
619 s->session_ctx->internal->stats.sess_hit++;
620
621 SSL_SESSION_free(s->session);
622 s->session = sess;
623 s->verify_result = s->session->verify_result;
624
625 return 1;
626
627 err:
628 SSL_SESSION_free(sess);
629 if (ticket_decrypted) {
630 /*
631 * The session was from a ticket. Issue a ticket for the new
632 * session.
633 */
634 s->internal->tlsext_ticket_expected = 1;
635 }
636 if (fatal) {
637 *alert = alert_desc;
638 return -1;
639 }
640 return 0;
641}
642
643int
644SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
645{
646 int ret = 0;
647 SSL_SESSION *s;
648
649 /*
650 * Add just 1 reference count for the SSL_CTX's session cache
651 * even though it has two ways of access: each session is in a
652 * doubly linked list and an lhash.
653 */
654 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
655
656 /*
657 * If session c is in already in cache, we take back the increment
658 * later.
659 */
660 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
661 s = lh_SSL_SESSION_insert(ctx->internal->sessions, c);
662
663 /*
664 * s != NULL iff we already had a session with the given PID.
665 * In this case, s == c should hold (then we did not really modify
666 * ctx->internal->sessions), or we're in trouble.
667 */
668 if (s != NULL && s != c) {
669 /* We *are* in trouble ... */
670 SSL_SESSION_list_remove(ctx, s);
671 SSL_SESSION_free(s);
672 /*
673 * ... so pretend the other session did not exist in cache
674 * (we cannot handle two SSL_SESSION structures with identical
675 * session ID in the same cache, which could happen e.g. when
676 * two threads concurrently obtain the same session from an
677 * external cache).
678 */
679 s = NULL;
680 }
681
682 /* Put at the head of the queue unless it is already in the cache */
683 if (s == NULL)
684 SSL_SESSION_list_add(ctx, c);
685
686 if (s != NULL) {
687 /*
688 * existing cache entry -- decrement previously incremented
689 * reference count because it already takes into account the
690 * cache.
691 */
692 SSL_SESSION_free(s); /* s == c */
693 ret = 0;
694 } else {
695 /*
696 * New cache entry -- remove old ones if cache has become
697 * too large.
698 */
699
700 ret = 1;
701
702 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
703 while (SSL_CTX_sess_number(ctx) >
704 SSL_CTX_sess_get_cache_size(ctx)) {
705 if (!remove_session_lock(ctx,
706 ctx->internal->session_cache_tail, 0))
707 break;
708 else
709 ctx->internal->stats.sess_cache_full++;
710 }
711 }
712 }
713 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
714 return (ret);
715}
716
717int
718SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
719{
720 return remove_session_lock(ctx, c, 1);
721}
722
723static int
724remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
725{
726 SSL_SESSION *r;
727 int ret = 0;
728
729 if ((c != NULL) && (c->session_id_length != 0)) {
730 if (lck)
731 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
732 if ((r = lh_SSL_SESSION_retrieve(ctx->internal->sessions, c)) == c) {
733 ret = 1;
734 r = lh_SSL_SESSION_delete(ctx->internal->sessions, c);
735 SSL_SESSION_list_remove(ctx, c);
736 }
737 if (lck)
738 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
739
740 if (ret) {
741 r->internal->not_resumable = 1;
742 if (ctx->internal->remove_session_cb != NULL)
743 ctx->internal->remove_session_cb(ctx, r);
744 SSL_SESSION_free(r);
745 }
746 } else
747 ret = 0;
748 return (ret);
749}
750
751void
752SSL_SESSION_free(SSL_SESSION *ss)
753{
754 int i;
755
756 if (ss == NULL)
757 return;
758
759 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
760 if (i > 0)
761 return;
762
763 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->internal->ex_data);
764
765 explicit_bzero(ss->master_key, sizeof ss->master_key);
766 explicit_bzero(ss->session_id, sizeof ss->session_id);
767
768 ssl_sess_cert_free(ss->internal->sess_cert);
769
770 X509_free(ss->peer);
771
772 sk_SSL_CIPHER_free(ss->ciphers);
773
774 free(ss->tlsext_hostname);
775 free(ss->tlsext_tick);
776 free(ss->internal->tlsext_ecpointformatlist);
777 free(ss->internal->tlsext_supportedgroups);
778
779 freezero(ss->internal, sizeof(*ss->internal));
780 freezero(ss, sizeof(*ss));
781}
782
783int
784SSL_SESSION_up_ref(SSL_SESSION *ss)
785{
786 int refs = CRYPTO_add(&ss->references, 1, CRYPTO_LOCK_SSL_SESSION);
787 return (refs > 1) ? 1 : 0;
788}
789
790int
791SSL_set_session(SSL *s, SSL_SESSION *session)
792{
793 const SSL_METHOD *method;
794
795 if (session == NULL) {
796 SSL_SESSION_free(s->session);
797 s->session = NULL;
798
799 return SSL_set_ssl_method(s, s->ctx->method);
800 }
801
802 if ((method = ssl_get_method(session->ssl_version)) == NULL) {
803 SSLerror(s, SSL_R_UNABLE_TO_FIND_SSL_METHOD);
804 return (0);
805 }
806
807 if (!SSL_set_ssl_method(s, method))
808 return (0);
809
810 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
811 SSL_SESSION_free(s->session);
812 s->session = session;
813 s->verify_result = s->session->verify_result;
814
815 return (1);
816}
817
818size_t
819SSL_SESSION_get_master_key(const SSL_SESSION *ss, unsigned char *out,
820 size_t max_out)
821{
822 size_t len = ss->master_key_length;
823
824 if (out == NULL)
825 return len;
826
827 if (len > max_out)
828 len = max_out;
829
830 memcpy(out, ss->master_key, len);
831
832 return len;
833}
834
835long
836SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
837{
838 if (s == NULL)
839 return (0);
840 s->timeout = t;
841 return (1);
842}
843
844long
845SSL_SESSION_get_timeout(const SSL_SESSION *s)
846{
847 if (s == NULL)
848 return (0);
849 return (s->timeout);
850}
851
852/* XXX 2038 */
853long
854SSL_SESSION_get_time(const SSL_SESSION *s)
855{
856 if (s == NULL)
857 return (0);
858 return (s->time);
859}
860
861/* XXX 2038 */
862long
863SSL_SESSION_set_time(SSL_SESSION *s, long t)
864{
865 if (s == NULL)
866 return (0);
867 s->time = t;
868 return (t);
869}
870
871int
872SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
873{
874 return s->ssl_version;
875}
876
877const SSL_CIPHER *
878SSL_SESSION_get0_cipher(const SSL_SESSION *s)
879{
880 return s->cipher;
881}
882
883X509 *
884SSL_SESSION_get0_peer(SSL_SESSION *s)
885{
886 return s->peer;
887}
888
889int
890SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
891 unsigned int sid_len)
892{
893 if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
894 SSLerrorx(SSL_R_SSL_SESSION_ID_TOO_LONG);
895 return 0;
896 }
897 s->session_id_length = sid_len;
898 memmove(s->session_id, sid, sid_len);
899 return 1;
900}
901
902int
903SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
904 unsigned int sid_ctx_len)
905{
906 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
907 SSLerrorx(SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
908 return 0;
909 }
910 s->sid_ctx_length = sid_ctx_len;
911 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
912
913 return 1;
914}
915
916long
917SSL_CTX_set_timeout(SSL_CTX *s, long t)
918{
919 long l;
920
921 if (s == NULL)
922 return (0);
923 l = s->session_timeout;
924 s->session_timeout = t;
925
926 return (l);
927}
928
929long
930SSL_CTX_get_timeout(const SSL_CTX *s)
931{
932 if (s == NULL)
933 return (0);
934 return (s->session_timeout);
935}
936
937int
938SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s,
939 void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers,
940 SSL_CIPHER **cipher, void *arg), void *arg)
941{
942 if (s == NULL)
943 return (0);
944 s->internal->tls_session_secret_cb = tls_session_secret_cb;
945 s->internal->tls_session_secret_cb_arg = arg;
946 return (1);
947}
948
949int
950SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
951 void *arg)
952{
953 if (s == NULL)
954 return (0);
955 s->internal->tls_session_ticket_ext_cb = cb;
956 s->internal->tls_session_ticket_ext_cb_arg = arg;
957 return (1);
958}
959
960int
961SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
962{
963 if (s->version >= TLS1_VERSION) {
964 free(s->internal->tlsext_session_ticket);
965 s->internal->tlsext_session_ticket =
966 malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
967 if (!s->internal->tlsext_session_ticket) {
968 SSLerror(s, ERR_R_MALLOC_FAILURE);
969 return 0;
970 }
971
972 if (ext_data) {
973 s->internal->tlsext_session_ticket->length = ext_len;
974 s->internal->tlsext_session_ticket->data =
975 s->internal->tlsext_session_ticket + 1;
976 memcpy(s->internal->tlsext_session_ticket->data,
977 ext_data, ext_len);
978 } else {
979 s->internal->tlsext_session_ticket->length = 0;
980 s->internal->tlsext_session_ticket->data = NULL;
981 }
982
983 return 1;
984 }
985
986 return 0;
987}
988
989typedef struct timeout_param_st {
990 SSL_CTX *ctx;
991 long time;
992 struct lhash_st_SSL_SESSION *cache;
993} TIMEOUT_PARAM;
994
995static void
996timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p)
997{
998 if ((p->time == 0) || (p->time > (s->time + s->timeout))) {
999 /* timeout */
1000 /* The reason we don't call SSL_CTX_remove_session() is to
1001 * save on locking overhead */
1002 (void)lh_SSL_SESSION_delete(p->cache, s);
1003 SSL_SESSION_list_remove(p->ctx, s);
1004 s->internal->not_resumable = 1;
1005 if (p->ctx->internal->remove_session_cb != NULL)
1006 p->ctx->internal->remove_session_cb(p->ctx, s);
1007 SSL_SESSION_free(s);
1008 }
1009}
1010
1011static void
1012timeout_LHASH_DOALL_ARG(void *arg1, void *arg2)
1013{
1014 SSL_SESSION *a = arg1;
1015 TIMEOUT_PARAM *b = arg2;
1016
1017 timeout_doall_arg(a, b);
1018}
1019
1020/* XXX 2038 */
1021void
1022SSL_CTX_flush_sessions(SSL_CTX *s, long t)
1023{
1024 unsigned long i;
1025 TIMEOUT_PARAM tp;
1026
1027 tp.ctx = s;
1028 tp.cache = s->internal->sessions;
1029 if (tp.cache == NULL)
1030 return;
1031 tp.time = t;
1032 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
1033 i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load;
1034 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0;
1035 lh_SSL_SESSION_doall_arg(tp.cache, timeout_LHASH_DOALL_ARG,
1036 TIMEOUT_PARAM, &tp);
1037 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i;
1038 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
1039}
1040
1041int
1042ssl_clear_bad_session(SSL *s)
1043{
1044 if ((s->session != NULL) && !(s->internal->shutdown & SSL_SENT_SHUTDOWN) &&
1045 !(SSL_in_init(s) || SSL_in_before(s))) {
1046 SSL_CTX_remove_session(s->ctx, s->session);
1047 return (1);
1048 } else
1049 return (0);
1050}
1051
1052/* locked by SSL_CTX in the calling function */
1053static void
1054SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
1055{
1056 if ((s->internal->next == NULL) || (s->internal->prev == NULL))
1057 return;
1058
1059 if (s->internal->next == (SSL_SESSION *)&(ctx->internal->session_cache_tail)) {
1060 /* last element in list */
1061 if (s->internal->prev == (SSL_SESSION *)&(ctx->internal->session_cache_head)) {
1062 /* only one element in list */
1063 ctx->internal->session_cache_head = NULL;
1064 ctx->internal->session_cache_tail = NULL;
1065 } else {
1066 ctx->internal->session_cache_tail = s->internal->prev;
1067 s->internal->prev->internal->next =
1068 (SSL_SESSION *)&(ctx->internal->session_cache_tail);
1069 }
1070 } else {
1071 if (s->internal->prev == (SSL_SESSION *)&(ctx->internal->session_cache_head)) {
1072 /* first element in list */
1073 ctx->internal->session_cache_head = s->internal->next;
1074 s->internal->next->internal->prev =
1075 (SSL_SESSION *)&(ctx->internal->session_cache_head);
1076 } else {
1077 /* middle of list */
1078 s->internal->next->internal->prev = s->internal->prev;
1079 s->internal->prev->internal->next = s->internal->next;
1080 }
1081 }
1082 s->internal->prev = s->internal->next = NULL;
1083}
1084
1085static void
1086SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
1087{
1088 if ((s->internal->next != NULL) && (s->internal->prev != NULL))
1089 SSL_SESSION_list_remove(ctx, s);
1090
1091 if (ctx->internal->session_cache_head == NULL) {
1092 ctx->internal->session_cache_head = s;
1093 ctx->internal->session_cache_tail = s;
1094 s->internal->prev = (SSL_SESSION *)&(ctx->internal->session_cache_head);
1095 s->internal->next = (SSL_SESSION *)&(ctx->internal->session_cache_tail);
1096 } else {
1097 s->internal->next = ctx->internal->session_cache_head;
1098 s->internal->next->internal->prev = s;
1099 s->internal->prev = (SSL_SESSION *)&(ctx->internal->session_cache_head);
1100 ctx->internal->session_cache_head = s;
1101 }
1102}
1103
1104void
1105SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1106 int (*cb)(struct ssl_st *ssl, SSL_SESSION *sess)) {
1107 ctx->internal->new_session_cb = cb;
1108}
1109
1110int
1111(*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
1112{
1113 return ctx->internal->new_session_cb;
1114}
1115
1116void
1117SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1118 void (*cb)(SSL_CTX *ctx, SSL_SESSION *sess))
1119{
1120 ctx->internal->remove_session_cb = cb;
1121}
1122
1123void
1124(*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx, SSL_SESSION *sess)
1125{
1126 return ctx->internal->remove_session_cb;
1127}
1128
1129void
1130SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, SSL_SESSION *(*cb)(struct ssl_st *ssl,
1131 const unsigned char *data, int len, int *copy))
1132{
1133 ctx->internal->get_session_cb = cb;
1134}
1135
1136SSL_SESSION *
1137(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, const unsigned char *data,
1138 int len, int *copy)
1139{
1140 return ctx->internal->get_session_cb;
1141}
1142
1143void
1144SSL_CTX_set_info_callback(SSL_CTX *ctx,
1145 void (*cb)(const SSL *ssl, int type, int val))
1146{
1147 ctx->internal->info_callback = cb;
1148}
1149
1150void
1151(*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type, int val)
1152{
1153 return ctx->internal->info_callback;
1154}
1155
1156void
1157SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1158 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
1159{
1160 ctx->internal->client_cert_cb = cb;
1161}
1162
1163int
1164(*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509,
1165 EVP_PKEY **pkey)
1166{
1167 return ctx->internal->client_cert_cb;
1168}
1169
1170#ifndef OPENSSL_NO_ENGINE
1171int
1172SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1173{
1174 if (!ENGINE_init(e)) {
1175 SSLerrorx(ERR_R_ENGINE_LIB);
1176 return 0;
1177 }
1178 if (!ENGINE_get_ssl_client_cert_function(e)) {
1179 SSLerrorx(SSL_R_NO_CLIENT_CERT_METHOD);
1180 ENGINE_finish(e);
1181 return 0;
1182 }
1183 ctx->internal->client_cert_engine = e;
1184 return 1;
1185}
1186#endif
1187
1188void
1189SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1190 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
1191{
1192 ctx->internal->app_gen_cookie_cb = cb;
1193}
1194
1195void
1196SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1197 int (*cb)(SSL *ssl, const unsigned char *cookie, unsigned int cookie_len))
1198{
1199 ctx->internal->app_verify_cookie_cb = cb;
1200}
1201
1202int
1203PEM_write_SSL_SESSION(FILE *fp, SSL_SESSION *x)
1204{
1205 return PEM_ASN1_write((i2d_of_void *)i2d_SSL_SESSION,
1206 PEM_STRING_SSL_SESSION, fp, x, NULL, NULL, 0, NULL, NULL);
1207}
1208
1209SSL_SESSION *
1210PEM_read_SSL_SESSION(FILE *fp, SSL_SESSION **x, pem_password_cb *cb, void *u)
1211{
1212 return PEM_ASN1_read((d2i_of_void *)d2i_SSL_SESSION,
1213 PEM_STRING_SSL_SESSION, fp, (void **)x, cb, u);
1214}
1215
1216SSL_SESSION *
1217PEM_read_bio_SSL_SESSION(BIO *bp, SSL_SESSION **x, pem_password_cb *cb, void *u)
1218{
1219 return PEM_ASN1_read_bio((d2i_of_void *)d2i_SSL_SESSION,
1220 PEM_STRING_SSL_SESSION, bp, (void **)x, cb, u);
1221}
1222
1223int
1224PEM_write_bio_SSL_SESSION(BIO *bp, SSL_SESSION *x)
1225{
1226 return PEM_ASN1_write_bio((i2d_of_void *)i2d_SSL_SESSION,
1227 PEM_STRING_SSL_SESSION, bp, x, NULL, NULL, 0, NULL, NULL);
1228}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-12 17:30:35 +0000