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1/* $OpenBSD: ssl_sess.c,v 1.109 2022/01/11 19:03:15 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->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->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
225 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
226 ss->references = 1;
227 ss->timeout=60*5+4; /* 5 minute timeout by default */
228 ss->time = time(NULL);
229 ss->prev = NULL;
230 ss->next = NULL;
231 ss->tlsext_hostname = NULL;
232
233 ss->tlsext_ecpointformatlist_length = 0;
234 ss->tlsext_ecpointformatlist = NULL;
235 ss->tlsext_supportedgroups_length = 0;
236 ss->tlsext_supportedgroups = NULL;
237
238 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
239
240 return (ss);
241}
242
243const unsigned char *
244SSL_SESSION_get_id(const SSL_SESSION *ss, unsigned int *len)
245{
246 if (len != NULL)
247 *len = ss->session_id_length;
248 return ss->session_id;
249}
250
251const unsigned char *
252SSL_SESSION_get0_id_context(const SSL_SESSION *ss, unsigned int *len)
253{
254 if (len != NULL)
255 *len = (unsigned int)ss->sid_ctx_length;
256 return ss->sid_ctx;
257}
258
259unsigned int
260SSL_SESSION_get_compress_id(const SSL_SESSION *ss)
261{
262 return 0;
263}
264
265unsigned long
266SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
267{
268 return s->tlsext_tick_lifetime_hint;
269}
270
271int
272SSL_SESSION_has_ticket(const SSL_SESSION *s)
273{
274 return (s->tlsext_ticklen > 0) ? 1 : 0;
275}
276
277/*
278 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
279 * the ID with random gunk repeatedly until we have no conflict is going to
280 * complete in one iteration pretty much "most" of the time (btw:
281 * understatement). So, if it takes us 10 iterations and we still can't avoid
282 * a conflict - well that's a reasonable point to call it quits. Either the
283 * arc4random code is broken or someone is trying to open roughly very close to
284 * 2^128 (or 2^256) SSL sessions to our server. How you might store that many
285 * sessions is perhaps a more interesting question...
286 */
287
288#define MAX_SESS_ID_ATTEMPTS 10
289
290static int
291def_generate_session_id(const SSL *ssl, unsigned char *id, unsigned int *id_len)
292{
293 unsigned int retry = 0;
294
295 do {
296 arc4random_buf(id, *id_len);
297 } while (SSL_has_matching_session_id(ssl, id, *id_len) &&
298 (++retry < MAX_SESS_ID_ATTEMPTS));
299
300 if (retry < MAX_SESS_ID_ATTEMPTS)
301 return 1;
302
303 /* else - woops a session_id match */
304 /* XXX We should also check the external cache --
305 * but the probability of a collision is negligible, and
306 * we could not prevent the concurrent creation of sessions
307 * with identical IDs since we currently don't have means
308 * to atomically check whether a session ID already exists
309 * and make a reservation for it if it does not
310 * (this problem applies to the internal cache as well).
311 */
312 return 0;
313}
314
315int
316ssl_get_new_session(SSL *s, int session)
317{
318 unsigned int tmp;
319 SSL_SESSION *ss = NULL;
320 GEN_SESSION_CB cb = def_generate_session_id;
321
322 /* This gets used by clients and servers. */
323
324 if ((ss = SSL_SESSION_new()) == NULL)
325 return (0);
326
327 /* If the context has a default timeout, use it */
328 if (s->session_ctx->session_timeout == 0)
329 ss->timeout = SSL_get_default_timeout(s);
330 else
331 ss->timeout = s->session_ctx->session_timeout;
332
333 if (s->session != NULL) {
334 SSL_SESSION_free(s->session);
335 s->session = NULL;
336 }
337
338 if (session) {
339 switch (s->version) {
340 case TLS1_VERSION:
341 case TLS1_1_VERSION:
342 case TLS1_2_VERSION:
343 case DTLS1_VERSION:
344 case DTLS1_2_VERSION:
345 ss->ssl_version = s->version;
346 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
347 break;
348 default:
349 SSLerror(s, SSL_R_UNSUPPORTED_SSL_VERSION);
350 SSL_SESSION_free(ss);
351 return (0);
352 }
353
354 /* If RFC4507 ticket use empty session ID. */
355 if (s->internal->tlsext_ticket_expected) {
356 ss->session_id_length = 0;
357 goto sess_id_done;
358 }
359
360 /* Choose which callback will set the session ID. */
361 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
362 if (s->internal->generate_session_id)
363 cb = s->internal->generate_session_id;
364 else if (s->session_ctx->internal->generate_session_id)
365 cb = s->session_ctx->internal->generate_session_id;
366 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
367
368 /* Choose a session ID. */
369 tmp = ss->session_id_length;
370 if (!cb(s, ss->session_id, &tmp)) {
371 /* The callback failed */
372 SSLerror(s, SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
373 SSL_SESSION_free(ss);
374 return (0);
375 }
376
377 /*
378 * Don't allow the callback to set the session length to zero.
379 * nor set it higher than it was.
380 */
381 if (!tmp || (tmp > ss->session_id_length)) {
382 /* The callback set an illegal length */
383 SSLerror(s, SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
384 SSL_SESSION_free(ss);
385 return (0);
386 }
387 ss->session_id_length = tmp;
388
389 /* Finally, check for a conflict. */
390 if (SSL_has_matching_session_id(s, ss->session_id,
391 ss->session_id_length)) {
392 SSLerror(s, SSL_R_SSL_SESSION_ID_CONFLICT);
393 SSL_SESSION_free(ss);
394 return (0);
395 }
396
397 sess_id_done:
398 if (s->tlsext_hostname) {
399 ss->tlsext_hostname = strdup(s->tlsext_hostname);
400 if (ss->tlsext_hostname == NULL) {
401 SSLerror(s, ERR_R_INTERNAL_ERROR);
402 SSL_SESSION_free(ss);
403 return 0;
404 }
405 }
406 } else {
407 ss->session_id_length = 0;
408 }
409
410 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
411 SSLerror(s, ERR_R_INTERNAL_ERROR);
412 SSL_SESSION_free(ss);
413 return 0;
414 }
415
416 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
417 ss->sid_ctx_length = s->sid_ctx_length;
418 s->session = ss;
419 ss->ssl_version = s->version;
420 ss->verify_result = X509_V_OK;
421
422 return (1);
423}
424
425static SSL_SESSION *
426ssl_session_from_cache(SSL *s, CBS *session_id)
427{
428 SSL_SESSION *sess;
429 SSL_SESSION data;
430
431 if ((s->session_ctx->internal->session_cache_mode &
432 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
433 return NULL;
434
435 memset(&data, 0, sizeof(data));
436
437 data.ssl_version = s->version;
438 data.session_id_length = CBS_len(session_id);
439 memcpy(data.session_id, CBS_data(session_id), CBS_len(session_id));
440
441 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
442 sess = lh_SSL_SESSION_retrieve(s->session_ctx->internal->sessions, &data);
443 if (sess != NULL)
444 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
445 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
446
447 if (sess == NULL)
448 s->session_ctx->internal->stats.sess_miss++;
449
450 return sess;
451}
452
453static SSL_SESSION *
454ssl_session_from_callback(SSL *s, CBS *session_id)
455{
456 SSL_SESSION *sess;
457 int copy;
458
459 if (s->session_ctx->internal->get_session_cb == NULL)
460 return NULL;
461
462 copy = 1;
463 if ((sess = s->session_ctx->internal->get_session_cb(s,
464 CBS_data(session_id), CBS_len(session_id), &copy)) == NULL)
465 return NULL;
466 /*
467 * The copy handler may have set copy == 0 to indicate that the session
468 * structures are shared between threads and that it handles the
469 * reference count itself. If it didn't set copy to zero, we must
470 * increment the reference count.
471 */
472 if (copy)
473 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
474
475 s->session_ctx->internal->stats.sess_cb_hit++;
476
477 /* Add the externally cached session to the internal cache as well. */
478 if (!(s->session_ctx->internal->session_cache_mode &
479 SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
480 /*
481 * The following should not return 1,
482 * otherwise, things are very strange.
483 */
484 SSL_CTX_add_session(s->session_ctx, sess);
485 }
486
487 return sess;
488}
489
490static SSL_SESSION *
491ssl_session_by_id(SSL *s, CBS *session_id)
492{
493 SSL_SESSION *sess;
494
495 if (CBS_len(session_id) == 0)
496 return NULL;
497
498 if ((sess = ssl_session_from_cache(s, session_id)) == NULL)
499 sess = ssl_session_from_callback(s, session_id);
500
501 return sess;
502}
503
504/*
505 * ssl_get_prev_session attempts to find an SSL_SESSION to be used to resume
506 * this connection. It is only called by servers.
507 *
508 * session_id: points at the session ID in the ClientHello. This code will
509 * read past the end of this in order to parse out the session ticket
510 * extension, if any.
511 * ext_block: a CBS for the ClientHello extensions block.
512 * alert: alert that the caller should send in case of failure.
513 *
514 * Returns:
515 * -1: error
516 * 0: a session may have been found.
517 *
518 * Side effects:
519 * - If a session is found then s->session is pointed at it (after freeing
520 * an existing session if need be) and s->verify_result is set from the
521 * session.
522 * - For both new and resumed sessions, s->internal->tlsext_ticket_expected
523 * indicates whether the server should issue a new session ticket or not.
524 */
525int
526ssl_get_prev_session(SSL *s, CBS *session_id, CBS *ext_block, int *alert)
527{
528 SSL_SESSION *sess = NULL;
529 size_t session_id_len;
530 int alert_desc = SSL_AD_INTERNAL_ERROR, fatal = 0;
531 int ticket_decrypted = 0;
532
533 /* This is used only by servers. */
534
535 if (CBS_len(session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH)
536 goto err;
537
538 /* Sets s->internal->tlsext_ticket_expected. */
539 switch (tls1_process_ticket(s, ext_block, &alert_desc, &sess)) {
540 case TLS1_TICKET_FATAL_ERROR:
541 fatal = 1;
542 goto err;
543 case TLS1_TICKET_NONE:
544 case TLS1_TICKET_EMPTY:
545 if ((sess = ssl_session_by_id(s, session_id)) == NULL)
546 goto err;
547 break;
548 case TLS1_TICKET_NOT_DECRYPTED:
549 goto err;
550 case TLS1_TICKET_DECRYPTED:
551 ticket_decrypted = 1;
552
553 /*
554 * The session ID is used by some clients to detect that the
555 * ticket has been accepted so we copy it into sess.
556 */
557 if (!CBS_write_bytes(session_id, sess->session_id,
558 sizeof(sess->session_id), &session_id_len)) {
559 fatal = 1;
560 goto err;
561 }
562 sess->session_id_length = (unsigned int)session_id_len;
563 break;
564 default:
565 SSLerror(s, ERR_R_INTERNAL_ERROR);
566 fatal = 1;
567 goto err;
568 }
569
570 /* Now sess is non-NULL and we own one of its reference counts. */
571
572 if (sess->sid_ctx_length != s->sid_ctx_length ||
573 timingsafe_memcmp(sess->sid_ctx, s->sid_ctx,
574 sess->sid_ctx_length) != 0) {
575 /*
576 * We have the session requested by the client, but we don't
577 * want to use it in this context. Treat it like a cache miss.
578 */
579 goto err;
580 }
581
582 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
583 /*
584 * We can't be sure if this session is being used out of
585 * context, which is especially important for SSL_VERIFY_PEER.
586 * The application should have used
587 * SSL[_CTX]_set_session_id_context.
588 *
589 * For this error case, we generate an error instead of treating
590 * the event like a cache miss (otherwise it would be easy for
591 * applications to effectively disable the session cache by
592 * accident without anyone noticing).
593 */
594 SSLerror(s, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
595 fatal = 1;
596 goto err;
597 }
598
599 if (sess->cipher == NULL) {
600 sess->cipher = ssl3_get_cipher_by_id(sess->cipher_id);
601 if (sess->cipher == NULL)
602 goto err;
603 }
604
605 if (sess->timeout < (time(NULL) - sess->time)) {
606 s->session_ctx->internal->stats.sess_timeout++;
607 if (!ticket_decrypted) {
608 /* The session was from the cache, so remove it. */
609 SSL_CTX_remove_session(s->session_ctx, sess);
610 }
611 goto err;
612 }
613
614 s->session_ctx->internal->stats.sess_hit++;
615
616 SSL_SESSION_free(s->session);
617 s->session = sess;
618 s->verify_result = s->session->verify_result;
619
620 return 1;
621
622 err:
623 SSL_SESSION_free(sess);
624 if (ticket_decrypted) {
625 /*
626 * The session was from a ticket. Issue a ticket for the new
627 * session.
628 */
629 s->internal->tlsext_ticket_expected = 1;
630 }
631 if (fatal) {
632 *alert = alert_desc;
633 return -1;
634 }
635 return 0;
636}
637
638int
639SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
640{
641 int ret = 0;
642 SSL_SESSION *s;
643
644 /*
645 * Add just 1 reference count for the SSL_CTX's session cache
646 * even though it has two ways of access: each session is in a
647 * doubly linked list and an lhash.
648 */
649 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
650
651 /*
652 * If session c is in already in cache, we take back the increment
653 * later.
654 */
655 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
656 s = lh_SSL_SESSION_insert(ctx->internal->sessions, c);
657
658 /*
659 * s != NULL iff we already had a session with the given PID.
660 * In this case, s == c should hold (then we did not really modify
661 * ctx->internal->sessions), or we're in trouble.
662 */
663 if (s != NULL && s != c) {
664 /* We *are* in trouble ... */
665 SSL_SESSION_list_remove(ctx, s);
666 SSL_SESSION_free(s);
667 /*
668 * ... so pretend the other session did not exist in cache
669 * (we cannot handle two SSL_SESSION structures with identical
670 * session ID in the same cache, which could happen e.g. when
671 * two threads concurrently obtain the same session from an
672 * external cache).
673 */
674 s = NULL;
675 }
676
677 /* Put at the head of the queue unless it is already in the cache */
678 if (s == NULL)
679 SSL_SESSION_list_add(ctx, c);
680
681 if (s != NULL) {
682 /*
683 * existing cache entry -- decrement previously incremented
684 * reference count because it already takes into account the
685 * cache.
686 */
687 SSL_SESSION_free(s); /* s == c */
688 ret = 0;
689 } else {
690 /*
691 * New cache entry -- remove old ones if cache has become
692 * too large.
693 */
694
695 ret = 1;
696
697 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
698 while (SSL_CTX_sess_number(ctx) >
699 SSL_CTX_sess_get_cache_size(ctx)) {
700 if (!remove_session_lock(ctx,
701 ctx->internal->session_cache_tail, 0))
702 break;
703 else
704 ctx->internal->stats.sess_cache_full++;
705 }
706 }
707 }
708 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
709 return (ret);
710}
711
712int
713SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
714{
715 return remove_session_lock(ctx, c, 1);
716}
717
718static int
719remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
720{
721 SSL_SESSION *r;
722 int ret = 0;
723
724 if ((c != NULL) && (c->session_id_length != 0)) {
725 if (lck)
726 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
727 if ((r = lh_SSL_SESSION_retrieve(ctx->internal->sessions, c)) == c) {
728 ret = 1;
729 r = lh_SSL_SESSION_delete(ctx->internal->sessions, c);
730 SSL_SESSION_list_remove(ctx, c);
731 }
732 if (lck)
733 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
734
735 if (ret) {
736 r->not_resumable = 1;
737 if (ctx->internal->remove_session_cb != NULL)
738 ctx->internal->remove_session_cb(ctx, r);
739 SSL_SESSION_free(r);
740 }
741 } else
742 ret = 0;
743 return (ret);
744}
745
746void
747SSL_SESSION_free(SSL_SESSION *ss)
748{
749 int i;
750
751 if (ss == NULL)
752 return;
753
754 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
755 if (i > 0)
756 return;
757
758 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
759
760 explicit_bzero(ss->master_key, sizeof ss->master_key);
761 explicit_bzero(ss->session_id, sizeof ss->session_id);
762
763 sk_X509_pop_free(ss->cert_chain, X509_free);
764
765 X509_free(ss->peer_cert);
766
767 sk_SSL_CIPHER_free(ss->ciphers);
768
769 free(ss->tlsext_hostname);
770 free(ss->tlsext_tick);
771 free(ss->tlsext_ecpointformatlist);
772 free(ss->tlsext_supportedgroups);
773
774 freezero(ss, sizeof(*ss));
775}
776
777int
778SSL_SESSION_up_ref(SSL_SESSION *ss)
779{
780 int refs = CRYPTO_add(&ss->references, 1, CRYPTO_LOCK_SSL_SESSION);
781 return (refs > 1) ? 1 : 0;
782}
783
784int
785SSL_set_session(SSL *s, SSL_SESSION *session)
786{
787 const SSL_METHOD *method;
788
789 if (session == NULL) {
790 SSL_SESSION_free(s->session);
791 s->session = NULL;
792
793 return SSL_set_ssl_method(s, s->ctx->method);
794 }
795
796 if ((method = ssl_get_method(session->ssl_version)) == NULL) {
797 SSLerror(s, SSL_R_UNABLE_TO_FIND_SSL_METHOD);
798 return (0);
799 }
800
801 if (!SSL_set_ssl_method(s, method))
802 return (0);
803
804 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
805 SSL_SESSION_free(s->session);
806 s->session = session;
807 s->verify_result = s->session->verify_result;
808
809 return (1);
810}
811
812size_t
813SSL_SESSION_get_master_key(const SSL_SESSION *ss, unsigned char *out,
814 size_t max_out)
815{
816 size_t len = ss->master_key_length;
817
818 if (out == NULL)
819 return len;
820
821 if (len > max_out)
822 len = max_out;
823
824 memcpy(out, ss->master_key, len);
825
826 return len;
827}
828
829long
830SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
831{
832 if (s == NULL)
833 return (0);
834 s->timeout = t;
835 return (1);
836}
837
838long
839SSL_SESSION_get_timeout(const SSL_SESSION *s)
840{
841 if (s == NULL)
842 return (0);
843 return (s->timeout);
844}
845
846/* XXX 2038 */
847long
848SSL_SESSION_get_time(const SSL_SESSION *s)
849{
850 if (s == NULL)
851 return (0);
852 return (s->time);
853}
854
855/* XXX 2038 */
856long
857SSL_SESSION_set_time(SSL_SESSION *s, long t)
858{
859 if (s == NULL)
860 return (0);
861 s->time = t;
862 return (t);
863}
864
865int
866SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
867{
868 return s->ssl_version;
869}
870
871const SSL_CIPHER *
872SSL_SESSION_get0_cipher(const SSL_SESSION *s)
873{
874 return s->cipher;
875}
876
877X509 *
878SSL_SESSION_get0_peer(SSL_SESSION *s)
879{
880 return s->peer_cert;
881}
882
883int
884SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
885 unsigned int sid_len)
886{
887 if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
888 SSLerrorx(SSL_R_SSL_SESSION_ID_TOO_LONG);
889 return 0;
890 }
891 s->session_id_length = sid_len;
892 memmove(s->session_id, sid, sid_len);
893 return 1;
894}
895
896int
897SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
898 unsigned int sid_ctx_len)
899{
900 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
901 SSLerrorx(SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
902 return 0;
903 }
904 s->sid_ctx_length = sid_ctx_len;
905 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
906
907 return 1;
908}
909
910int
911SSL_SESSION_is_resumable(const SSL_SESSION *s)
912{
913 return 0;
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->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->next == NULL || s->prev == NULL)
1057 return;
1058
1059 if (s->next == (SSL_SESSION *)&(ctx->internal->session_cache_tail)) {
1060 /* last element in list */
1061 if (s->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->prev;
1067 s->prev->next =
1068 (SSL_SESSION *)&(ctx->internal->session_cache_tail);
1069 }
1070 } else {
1071 if (s->prev == (SSL_SESSION *)&(ctx->internal->session_cache_head)) {
1072 /* first element in list */
1073 ctx->internal->session_cache_head = s->next;
1074 s->next->prev =
1075 (SSL_SESSION *)&(ctx->internal->session_cache_head);
1076 } else {
1077 /* middle of list */
1078 s->next->prev = s->prev;
1079 s->prev->next = s->next;
1080 }
1081 }
1082 s->prev = s->next = NULL;
1083}
1084
1085static void
1086SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
1087{
1088 if (s->next != NULL && s->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->prev = (SSL_SESSION *)&(ctx->internal->session_cache_head);
1095 s->next = (SSL_SESSION *)&(ctx->internal->session_cache_tail);
1096 } else {
1097 s->next = ctx->internal->session_cache_head;
1098 s->next->prev = s;
1099 s->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}
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