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diff --git a/src/lib/libssl/ssl_sess.c b/src/lib/libssl/ssl_sess.c
deleted file mode 100644
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1/* $OpenBSD: ssl_sess.c,v 1.121 2022/11/26 16:08:56 tb 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_local.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 minutes 4 seconds timeout by default */
228 ss->time = time(NULL);
229 ss->prev = NULL;
230 ss->next = NULL;
231 ss->tlsext_hostname = NULL;
232
233 ss->peer_cert_type = -1;
234
235 ss->tlsext_ecpointformatlist_length = 0;
236 ss->tlsext_ecpointformatlist = NULL;
237 ss->tlsext_supportedgroups_length = 0;
238 ss->tlsext_supportedgroups = NULL;
239
240 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
241
242 return (ss);
243}
244
245SSL_SESSION *
246ssl_session_dup(SSL_SESSION *sess, int include_ticket)
247{
248 SSL_SESSION *copy;
249 CBS cbs;
250
251 if ((copy = calloc(1, sizeof(*copy))) == NULL) {
252 SSLerrorx(ERR_R_MALLOC_FAILURE);
253 goto err;
254 }
255
256 copy->ssl_version = sess->ssl_version;
257
258 CBS_init(&cbs, sess->master_key, sess->master_key_length);
259 if (!CBS_write_bytes(&cbs, copy->master_key, sizeof(copy->master_key),
260 &copy->master_key_length))
261 goto err;
262
263 CBS_init(&cbs, sess->session_id, sess->session_id_length);
264 if (!CBS_write_bytes(&cbs, copy->session_id, sizeof(copy->session_id),
265 &copy->session_id_length))
266 goto err;
267
268 CBS_init(&cbs, sess->sid_ctx, sess->sid_ctx_length);
269 if (!CBS_write_bytes(&cbs, copy->sid_ctx, sizeof(copy->sid_ctx),
270 &copy->sid_ctx_length))
271 goto err;
272
273 if (sess->peer_cert != NULL) {
274 if (!X509_up_ref(sess->peer_cert))
275 goto err;
276 copy->peer_cert = sess->peer_cert;
277 }
278 copy->peer_cert_type = sess->peer_cert_type;
279
280 copy->verify_result = sess->verify_result;
281
282 copy->timeout = sess->timeout;
283 copy->time = sess->time;
284 copy->references = 1;
285
286 copy->cipher = sess->cipher;
287 copy->cipher_id = sess->cipher_id;
288
289 if (sess->ciphers != NULL) {
290 if ((copy->ciphers = sk_SSL_CIPHER_dup(sess->ciphers)) == NULL)
291 goto err;
292 }
293
294 if (sess->tlsext_hostname != NULL) {
295 copy->tlsext_hostname = strdup(sess->tlsext_hostname);
296 if (copy->tlsext_hostname == NULL)
297 goto err;
298 }
299
300 if (include_ticket) {
301 CBS_init(&cbs, sess->tlsext_tick, sess->tlsext_ticklen);
302 if (!CBS_stow(&cbs, &copy->tlsext_tick, &copy->tlsext_ticklen))
303 goto err;
304 copy->tlsext_tick_lifetime_hint =
305 sess->tlsext_tick_lifetime_hint;
306
307 /*
308 * XXX - copy sess->resumption_master_secret and all other
309 * TLSv1.3 info here.
310 */
311 }
312
313 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, copy,
314 &copy->ex_data))
315 goto err;
316
317 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, &copy->ex_data,
318 &sess->ex_data))
319 goto err;
320
321 /* Omit prev/next: the new session gets its own slot in the cache. */
322
323 copy->not_resumable = sess->not_resumable;
324
325 CBS_init(&cbs, sess->tlsext_ecpointformatlist,
326 sess->tlsext_ecpointformatlist_length);
327 if (!CBS_stow(&cbs, &copy->tlsext_ecpointformatlist,
328 &copy->tlsext_ecpointformatlist_length))
329 goto err;
330
331 if (sess->tlsext_supportedgroups != NULL) {
332 if ((copy->tlsext_supportedgroups = calloc(sizeof(uint16_t),
333 sess->tlsext_supportedgroups_length)) == NULL)
334 goto err;
335 memcpy(copy->tlsext_supportedgroups,
336 sess->tlsext_supportedgroups,
337 sizeof(uint16_t) * sess->tlsext_supportedgroups_length);
338 copy->tlsext_supportedgroups_length =
339 sess->tlsext_supportedgroups_length;
340 }
341
342 return copy;
343
344 err:
345 SSL_SESSION_free(copy);
346
347 return NULL;
348}
349
350const unsigned char *
351SSL_SESSION_get_id(const SSL_SESSION *ss, unsigned int *len)
352{
353 if (len != NULL)
354 *len = (unsigned int)ss->session_id_length;
355 return ss->session_id;
356}
357
358const unsigned char *
359SSL_SESSION_get0_id_context(const SSL_SESSION *ss, unsigned int *len)
360{
361 if (len != NULL)
362 *len = (unsigned int)ss->sid_ctx_length;
363 return ss->sid_ctx;
364}
365
366unsigned int
367SSL_SESSION_get_compress_id(const SSL_SESSION *ss)
368{
369 return 0;
370}
371
372unsigned long
373SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
374{
375 return s->tlsext_tick_lifetime_hint;
376}
377
378int
379SSL_SESSION_has_ticket(const SSL_SESSION *s)
380{
381 return (s->tlsext_ticklen > 0) ? 1 : 0;
382}
383
384/*
385 * SSLv3/TLSv1 has 32 bytes (256 bits) of session ID space. As such, filling
386 * the ID with random gunk repeatedly until we have no conflict is going to
387 * complete in one iteration pretty much "most" of the time (btw:
388 * understatement). So, if it takes us 10 iterations and we still can't avoid
389 * a conflict - well that's a reasonable point to call it quits. Either the
390 * arc4random code is broken or someone is trying to open roughly very close to
391 * 2^128 (or 2^256) SSL sessions to our server. How you might store that many
392 * sessions is perhaps a more interesting question...
393 */
394
395#define MAX_SESS_ID_ATTEMPTS 10
396
397static int
398def_generate_session_id(const SSL *ssl, unsigned char *id, unsigned int *id_len)
399{
400 unsigned int retry = 0;
401
402 do {
403 arc4random_buf(id, *id_len);
404 } while (SSL_has_matching_session_id(ssl, id, *id_len) &&
405 (++retry < MAX_SESS_ID_ATTEMPTS));
406
407 if (retry < MAX_SESS_ID_ATTEMPTS)
408 return 1;
409
410 /* else - woops a session_id match */
411 /* XXX We should also check the external cache --
412 * but the probability of a collision is negligible, and
413 * we could not prevent the concurrent creation of sessions
414 * with identical IDs since we currently don't have means
415 * to atomically check whether a session ID already exists
416 * and make a reservation for it if it does not
417 * (this problem applies to the internal cache as well).
418 */
419 return 0;
420}
421
422int
423ssl_get_new_session(SSL *s, int session)
424{
425 unsigned int tmp;
426 SSL_SESSION *ss = NULL;
427 GEN_SESSION_CB cb = def_generate_session_id;
428
429 /* This gets used by clients and servers. */
430
431 if ((ss = SSL_SESSION_new()) == NULL)
432 return (0);
433
434 /* If the context has a default timeout, use it */
435 if (s->session_ctx->session_timeout == 0)
436 ss->timeout = SSL_get_default_timeout(s);
437 else
438 ss->timeout = s->session_ctx->session_timeout;
439
440 if (s->session != NULL) {
441 SSL_SESSION_free(s->session);
442 s->session = NULL;
443 }
444
445 if (session) {
446 switch (s->version) {
447 case TLS1_VERSION:
448 case TLS1_1_VERSION:
449 case TLS1_2_VERSION:
450 case DTLS1_VERSION:
451 case DTLS1_2_VERSION:
452 ss->ssl_version = s->version;
453 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH;
454 break;
455 default:
456 SSLerror(s, SSL_R_UNSUPPORTED_SSL_VERSION);
457 SSL_SESSION_free(ss);
458 return (0);
459 }
460
461 /* If RFC4507 ticket use empty session ID. */
462 if (s->tlsext_ticket_expected) {
463 ss->session_id_length = 0;
464 goto sess_id_done;
465 }
466
467 /* Choose which callback will set the session ID. */
468 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
469 if (s->generate_session_id)
470 cb = s->generate_session_id;
471 else if (s->session_ctx->generate_session_id)
472 cb = s->session_ctx->generate_session_id;
473 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
474
475 /* Choose a session ID. */
476 tmp = ss->session_id_length;
477 if (!cb(s, ss->session_id, &tmp)) {
478 /* The callback failed */
479 SSLerror(s, SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
480 SSL_SESSION_free(ss);
481 return (0);
482 }
483
484 /*
485 * Don't allow the callback to set the session length to zero.
486 * nor set it higher than it was.
487 */
488 if (tmp == 0 || tmp > ss->session_id_length) {
489 /* The callback set an illegal length */
490 SSLerror(s, SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
491 SSL_SESSION_free(ss);
492 return (0);
493 }
494 ss->session_id_length = tmp;
495
496 /* Finally, check for a conflict. */
497 if (SSL_has_matching_session_id(s, ss->session_id,
498 ss->session_id_length)) {
499 SSLerror(s, SSL_R_SSL_SESSION_ID_CONFLICT);
500 SSL_SESSION_free(ss);
501 return (0);
502 }
503
504 sess_id_done:
505 if (s->tlsext_hostname) {
506 ss->tlsext_hostname = strdup(s->tlsext_hostname);
507 if (ss->tlsext_hostname == NULL) {
508 SSLerror(s, ERR_R_INTERNAL_ERROR);
509 SSL_SESSION_free(ss);
510 return 0;
511 }
512 }
513 } else {
514 ss->session_id_length = 0;
515 }
516
517 if (s->sid_ctx_length > sizeof ss->sid_ctx) {
518 SSLerror(s, ERR_R_INTERNAL_ERROR);
519 SSL_SESSION_free(ss);
520 return 0;
521 }
522
523 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length);
524 ss->sid_ctx_length = s->sid_ctx_length;
525 s->session = ss;
526 ss->ssl_version = s->version;
527 ss->verify_result = X509_V_OK;
528
529 return (1);
530}
531
532static SSL_SESSION *
533ssl_session_from_cache(SSL *s, CBS *session_id)
534{
535 SSL_SESSION *sess;
536 SSL_SESSION data;
537
538 if ((s->session_ctx->session_cache_mode &
539 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
540 return NULL;
541
542 memset(&data, 0, sizeof(data));
543
544 data.ssl_version = s->version;
545
546 if (!CBS_write_bytes(session_id, data.session_id,
547 sizeof(data.session_id), &data.session_id_length))
548 return NULL;
549
550 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
551 sess = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
552 if (sess != NULL)
553 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
554 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
555
556 if (sess == NULL)
557 s->session_ctx->stats.sess_miss++;
558
559 return sess;
560}
561
562static SSL_SESSION *
563ssl_session_from_callback(SSL *s, CBS *session_id)
564{
565 SSL_SESSION *sess;
566 int copy;
567
568 if (s->session_ctx->get_session_cb == NULL)
569 return NULL;
570
571 copy = 1;
572 if ((sess = s->session_ctx->get_session_cb(s,
573 CBS_data(session_id), CBS_len(session_id), &copy)) == NULL)
574 return NULL;
575 /*
576 * The copy handler may have set copy == 0 to indicate that the session
577 * structures are shared between threads and that it handles the
578 * reference count itself. If it didn't set copy to zero, we must
579 * increment the reference count.
580 */
581 if (copy)
582 CRYPTO_add(&sess->references, 1, CRYPTO_LOCK_SSL_SESSION);
583
584 s->session_ctx->stats.sess_cb_hit++;
585
586 /* Add the externally cached session to the internal cache as well. */
587 if (!(s->session_ctx->session_cache_mode &
588 SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
589 /*
590 * The following should not return 1,
591 * otherwise, things are very strange.
592 */
593 SSL_CTX_add_session(s->session_ctx, sess);
594 }
595
596 return sess;
597}
598
599static SSL_SESSION *
600ssl_session_by_id(SSL *s, CBS *session_id)
601{
602 SSL_SESSION *sess;
603
604 if (CBS_len(session_id) == 0)
605 return NULL;
606
607 if ((sess = ssl_session_from_cache(s, session_id)) == NULL)
608 sess = ssl_session_from_callback(s, session_id);
609
610 return sess;
611}
612
613/*
614 * ssl_get_prev_session attempts to find an SSL_SESSION to be used to resume
615 * this connection. It is only called by servers.
616 *
617 * session_id: points at the session ID in the ClientHello. This code will
618 * read past the end of this in order to parse out the session ticket
619 * extension, if any.
620 * ext_block: a CBS for the ClientHello extensions block.
621 * alert: alert that the caller should send in case of failure.
622 *
623 * Returns:
624 * -1: error
625 * 0: a session may have been found.
626 *
627 * Side effects:
628 * - If a session is found then s->session is pointed at it (after freeing
629 * an existing session if need be) and s->verify_result is set from the
630 * session.
631 * - For both new and resumed sessions, s->tlsext_ticket_expected
632 * indicates whether the server should issue a new session ticket or not.
633 */
634int
635ssl_get_prev_session(SSL *s, CBS *session_id, CBS *ext_block, int *alert)
636{
637 SSL_SESSION *sess = NULL;
638 int alert_desc = SSL_AD_INTERNAL_ERROR, fatal = 0;
639 int ticket_decrypted = 0;
640
641 /* This is used only by servers. */
642
643 if (CBS_len(session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH)
644 goto err;
645
646 /* Sets s->tlsext_ticket_expected. */
647 switch (tls1_process_ticket(s, ext_block, &alert_desc, &sess)) {
648 case TLS1_TICKET_FATAL_ERROR:
649 fatal = 1;
650 goto err;
651 case TLS1_TICKET_NONE:
652 case TLS1_TICKET_EMPTY:
653 if ((sess = ssl_session_by_id(s, session_id)) == NULL)
654 goto err;
655 break;
656 case TLS1_TICKET_NOT_DECRYPTED:
657 goto err;
658 case TLS1_TICKET_DECRYPTED:
659 ticket_decrypted = 1;
660
661 /*
662 * The session ID is used by some clients to detect that the
663 * ticket has been accepted so we copy it into sess.
664 */
665 if (!CBS_write_bytes(session_id, sess->session_id,
666 sizeof(sess->session_id), &sess->session_id_length)) {
667 fatal = 1;
668 goto err;
669 }
670 break;
671 default:
672 SSLerror(s, ERR_R_INTERNAL_ERROR);
673 fatal = 1;
674 goto err;
675 }
676
677 /* Now sess is non-NULL and we own one of its reference counts. */
678
679 if (sess->sid_ctx_length != s->sid_ctx_length ||
680 timingsafe_memcmp(sess->sid_ctx, s->sid_ctx,
681 sess->sid_ctx_length) != 0) {
682 /*
683 * We have the session requested by the client, but we don't
684 * want to use it in this context. Treat it like a cache miss.
685 */
686 goto err;
687 }
688
689 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
690 /*
691 * We can't be sure if this session is being used out of
692 * context, which is especially important for SSL_VERIFY_PEER.
693 * The application should have used
694 * SSL[_CTX]_set_session_id_context.
695 *
696 * For this error case, we generate an error instead of treating
697 * the event like a cache miss (otherwise it would be easy for
698 * applications to effectively disable the session cache by
699 * accident without anyone noticing).
700 */
701 SSLerror(s, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
702 fatal = 1;
703 goto err;
704 }
705
706 if (sess->cipher == NULL) {
707 sess->cipher = ssl3_get_cipher_by_id(sess->cipher_id);
708 if (sess->cipher == NULL)
709 goto err;
710 }
711
712 if (sess->timeout < (time(NULL) - sess->time)) {
713 s->session_ctx->stats.sess_timeout++;
714 if (!ticket_decrypted) {
715 /* The session was from the cache, so remove it. */
716 SSL_CTX_remove_session(s->session_ctx, sess);
717 }
718 goto err;
719 }
720
721 s->session_ctx->stats.sess_hit++;
722
723 SSL_SESSION_free(s->session);
724 s->session = sess;
725 s->verify_result = s->session->verify_result;
726
727 return 1;
728
729 err:
730 SSL_SESSION_free(sess);
731 if (ticket_decrypted) {
732 /*
733 * The session was from a ticket. Issue a ticket for the new
734 * session.
735 */
736 s->tlsext_ticket_expected = 1;
737 }
738 if (fatal) {
739 *alert = alert_desc;
740 return -1;
741 }
742 return 0;
743}
744
745int
746SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
747{
748 int ret = 0;
749 SSL_SESSION *s;
750
751 /*
752 * Add just 1 reference count for the SSL_CTX's session cache
753 * even though it has two ways of access: each session is in a
754 * doubly linked list and an lhash.
755 */
756 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION);
757
758 /*
759 * If session c is in already in cache, we take back the increment
760 * later.
761 */
762 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
763 s = lh_SSL_SESSION_insert(ctx->sessions, c);
764
765 /*
766 * s != NULL iff we already had a session with the given PID.
767 * In this case, s == c should hold (then we did not really modify
768 * ctx->sessions), or we're in trouble.
769 */
770 if (s != NULL && s != c) {
771 /* We *are* in trouble ... */
772 SSL_SESSION_list_remove(ctx, s);
773 SSL_SESSION_free(s);
774 /*
775 * ... so pretend the other session did not exist in cache
776 * (we cannot handle two SSL_SESSION structures with identical
777 * session ID in the same cache, which could happen e.g. when
778 * two threads concurrently obtain the same session from an
779 * external cache).
780 */
781 s = NULL;
782 }
783
784 /* Put at the head of the queue unless it is already in the cache */
785 if (s == NULL)
786 SSL_SESSION_list_add(ctx, c);
787
788 if (s != NULL) {
789 /*
790 * existing cache entry -- decrement previously incremented
791 * reference count because it already takes into account the
792 * cache.
793 */
794 SSL_SESSION_free(s); /* s == c */
795 ret = 0;
796 } else {
797 /*
798 * New cache entry -- remove old ones if cache has become
799 * too large.
800 */
801
802 ret = 1;
803
804 if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
805 while (SSL_CTX_sess_number(ctx) >
806 SSL_CTX_sess_get_cache_size(ctx)) {
807 if (!remove_session_lock(ctx,
808 ctx->session_cache_tail, 0))
809 break;
810 else
811 ctx->stats.sess_cache_full++;
812 }
813 }
814 }
815 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
816 return (ret);
817}
818
819int
820SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
821{
822 return remove_session_lock(ctx, c, 1);
823}
824
825static int
826remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
827{
828 SSL_SESSION *r;
829 int ret = 0;
830
831 if (c == NULL || c->session_id_length == 0)
832 return 0;
833
834 if (lck)
835 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
836 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) {
837 ret = 1;
838 r = lh_SSL_SESSION_delete(ctx->sessions, c);
839 SSL_SESSION_list_remove(ctx, c);
840 }
841 if (lck)
842 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
843
844 if (ret) {
845 r->not_resumable = 1;
846 if (ctx->remove_session_cb != NULL)
847 ctx->remove_session_cb(ctx, r);
848 SSL_SESSION_free(r);
849 }
850
851 return ret;
852}
853
854void
855SSL_SESSION_free(SSL_SESSION *ss)
856{
857 int i;
858
859 if (ss == NULL)
860 return;
861
862 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION);
863 if (i > 0)
864 return;
865
866 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
867
868 explicit_bzero(ss->master_key, sizeof ss->master_key);
869 explicit_bzero(ss->session_id, sizeof ss->session_id);
870
871 X509_free(ss->peer_cert);
872
873 sk_SSL_CIPHER_free(ss->ciphers);
874
875 free(ss->tlsext_hostname);
876 free(ss->tlsext_tick);
877 free(ss->tlsext_ecpointformatlist);
878 free(ss->tlsext_supportedgroups);
879
880 tls13_secret_cleanup(&ss->resumption_master_secret);
881
882 freezero(ss, sizeof(*ss));
883}
884
885int
886SSL_SESSION_up_ref(SSL_SESSION *ss)
887{
888 int refs = CRYPTO_add(&ss->references, 1, CRYPTO_LOCK_SSL_SESSION);
889 return (refs > 1) ? 1 : 0;
890}
891
892int
893SSL_set_session(SSL *s, SSL_SESSION *session)
894{
895 const SSL_METHOD *method;
896
897 if (session == NULL) {
898 SSL_SESSION_free(s->session);
899 s->session = NULL;
900
901 return SSL_set_ssl_method(s, s->ctx->method);
902 }
903
904 if ((method = ssl_get_method(session->ssl_version)) == NULL) {
905 SSLerror(s, SSL_R_UNABLE_TO_FIND_SSL_METHOD);
906 return (0);
907 }
908
909 if (!SSL_set_ssl_method(s, method))
910 return (0);
911
912 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION);
913 SSL_SESSION_free(s->session);
914 s->session = session;
915 s->verify_result = s->session->verify_result;
916
917 return (1);
918}
919
920size_t
921SSL_SESSION_get_master_key(const SSL_SESSION *ss, unsigned char *out,
922 size_t max_out)
923{
924 size_t len = ss->master_key_length;
925
926 if (out == NULL)
927 return len;
928
929 if (len > max_out)
930 len = max_out;
931
932 memcpy(out, ss->master_key, len);
933
934 return len;
935}
936
937long
938SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
939{
940 if (s == NULL)
941 return (0);
942 s->timeout = t;
943 return (1);
944}
945
946long
947SSL_SESSION_get_timeout(const SSL_SESSION *s)
948{
949 if (s == NULL)
950 return (0);
951 return (s->timeout);
952}
953
954/* XXX 2038 */
955long
956SSL_SESSION_get_time(const SSL_SESSION *s)
957{
958 if (s == NULL)
959 return (0);
960 return (s->time);
961}
962
963/* XXX 2038 */
964long
965SSL_SESSION_set_time(SSL_SESSION *s, long t)
966{
967 if (s == NULL)
968 return (0);
969 s->time = t;
970 return (t);
971}
972
973int
974SSL_SESSION_get_protocol_version(const SSL_SESSION *s)
975{
976 return s->ssl_version;
977}
978
979const SSL_CIPHER *
980SSL_SESSION_get0_cipher(const SSL_SESSION *s)
981{
982 return s->cipher;
983}
984
985X509 *
986SSL_SESSION_get0_peer(SSL_SESSION *s)
987{
988 return s->peer_cert;
989}
990
991int
992SSL_SESSION_set1_id(SSL_SESSION *s, const unsigned char *sid,
993 unsigned int sid_len)
994{
995 if (sid_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
996 SSLerrorx(SSL_R_SSL_SESSION_ID_TOO_LONG);
997 return 0;
998 }
999 s->session_id_length = sid_len;
1000 memmove(s->session_id, sid, sid_len);
1001 return 1;
1002}
1003
1004int
1005SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx,
1006 unsigned int sid_ctx_len)
1007{
1008 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) {
1009 SSLerrorx(SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
1010 return 0;
1011 }
1012 s->sid_ctx_length = sid_ctx_len;
1013 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len);
1014
1015 return 1;
1016}
1017
1018int
1019SSL_SESSION_is_resumable(const SSL_SESSION *s)
1020{
1021 return 0;
1022}
1023
1024long
1025SSL_CTX_set_timeout(SSL_CTX *s, long t)
1026{
1027 long l;
1028
1029 if (s == NULL)
1030 return (0);
1031 l = s->session_timeout;
1032 s->session_timeout = t;
1033
1034 return (l);
1035}
1036
1037long
1038SSL_CTX_get_timeout(const SSL_CTX *s)
1039{
1040 if (s == NULL)
1041 return (0);
1042 return (s->session_timeout);
1043}
1044
1045int
1046SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s,
1047 void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers,
1048 SSL_CIPHER **cipher, void *arg), void *arg)
1049{
1050 if (s == NULL)
1051 return (0);
1052 s->tls_session_secret_cb = tls_session_secret_cb;
1053 s->tls_session_secret_cb_arg = arg;
1054 return (1);
1055}
1056
1057int
1058SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
1059 void *arg)
1060{
1061 if (s == NULL)
1062 return (0);
1063 s->tls_session_ticket_ext_cb = cb;
1064 s->tls_session_ticket_ext_cb_arg = arg;
1065 return (1);
1066}
1067
1068int
1069SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
1070{
1071 if (s->version >= TLS1_VERSION) {
1072 free(s->tlsext_session_ticket);
1073 s->tlsext_session_ticket =
1074 malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
1075 if (!s->tlsext_session_ticket) {
1076 SSLerror(s, ERR_R_MALLOC_FAILURE);
1077 return 0;
1078 }
1079
1080 if (ext_data) {
1081 s->tlsext_session_ticket->length = ext_len;
1082 s->tlsext_session_ticket->data =
1083 s->tlsext_session_ticket + 1;
1084 memcpy(s->tlsext_session_ticket->data,
1085 ext_data, ext_len);
1086 } else {
1087 s->tlsext_session_ticket->length = 0;
1088 s->tlsext_session_ticket->data = NULL;
1089 }
1090
1091 return 1;
1092 }
1093
1094 return 0;
1095}
1096
1097typedef struct timeout_param_st {
1098 SSL_CTX *ctx;
1099 long time;
1100 struct lhash_st_SSL_SESSION *cache;
1101} TIMEOUT_PARAM;
1102
1103static void
1104timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p)
1105{
1106 if ((p->time == 0) || (p->time > (s->time + s->timeout))) {
1107 /* timeout */
1108 /* The reason we don't call SSL_CTX_remove_session() is to
1109 * save on locking overhead */
1110 (void)lh_SSL_SESSION_delete(p->cache, s);
1111 SSL_SESSION_list_remove(p->ctx, s);
1112 s->not_resumable = 1;
1113 if (p->ctx->remove_session_cb != NULL)
1114 p->ctx->remove_session_cb(p->ctx, s);
1115 SSL_SESSION_free(s);
1116 }
1117}
1118
1119static void
1120timeout_LHASH_DOALL_ARG(void *arg1, void *arg2)
1121{
1122 SSL_SESSION *a = arg1;
1123 TIMEOUT_PARAM *b = arg2;
1124
1125 timeout_doall_arg(a, b);
1126}
1127
1128/* XXX 2038 */
1129void
1130SSL_CTX_flush_sessions(SSL_CTX *s, long t)
1131{
1132 unsigned long i;
1133 TIMEOUT_PARAM tp;
1134
1135 tp.ctx = s;
1136 tp.cache = s->sessions;
1137 if (tp.cache == NULL)
1138 return;
1139 tp.time = t;
1140 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
1141 i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load;
1142 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0;
1143 lh_SSL_SESSION_doall_arg(tp.cache, timeout_LHASH_DOALL_ARG,
1144 TIMEOUT_PARAM, &tp);
1145 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i;
1146 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
1147}
1148
1149int
1150ssl_clear_bad_session(SSL *s)
1151{
1152 if ((s->session != NULL) && !(s->shutdown & SSL_SENT_SHUTDOWN) &&
1153 !(SSL_in_init(s) || SSL_in_before(s))) {
1154 SSL_CTX_remove_session(s->ctx, s->session);
1155 return (1);
1156 } else
1157 return (0);
1158}
1159
1160/* locked by SSL_CTX in the calling function */
1161static void
1162SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
1163{
1164 if (s->next == NULL || s->prev == NULL)
1165 return;
1166
1167 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) {
1168 /* last element in list */
1169 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1170 /* only one element in list */
1171 ctx->session_cache_head = NULL;
1172 ctx->session_cache_tail = NULL;
1173 } else {
1174 ctx->session_cache_tail = s->prev;
1175 s->prev->next =
1176 (SSL_SESSION *)&(ctx->session_cache_tail);
1177 }
1178 } else {
1179 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) {
1180 /* first element in list */
1181 ctx->session_cache_head = s->next;
1182 s->next->prev =
1183 (SSL_SESSION *)&(ctx->session_cache_head);
1184 } else {
1185 /* middle of list */
1186 s->next->prev = s->prev;
1187 s->prev->next = s->next;
1188 }
1189 }
1190 s->prev = s->next = NULL;
1191}
1192
1193static void
1194SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
1195{
1196 if (s->next != NULL && s->prev != NULL)
1197 SSL_SESSION_list_remove(ctx, s);
1198
1199 if (ctx->session_cache_head == NULL) {
1200 ctx->session_cache_head = s;
1201 ctx->session_cache_tail = s;
1202 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1203 s->next = (SSL_SESSION *)&(ctx->session_cache_tail);
1204 } else {
1205 s->next = ctx->session_cache_head;
1206 s->next->prev = s;
1207 s->prev = (SSL_SESSION *)&(ctx->session_cache_head);
1208 ctx->session_cache_head = s;
1209 }
1210}
1211
1212void
1213SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1214 int (*cb)(struct ssl_st *ssl, SSL_SESSION *sess)) {
1215 ctx->new_session_cb = cb;
1216}
1217
1218int
1219(*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
1220{
1221 return ctx->new_session_cb;
1222}
1223
1224void
1225SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1226 void (*cb)(SSL_CTX *ctx, SSL_SESSION *sess))
1227{
1228 ctx->remove_session_cb = cb;
1229}
1230
1231void
1232(*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx, SSL_SESSION *sess)
1233{
1234 return ctx->remove_session_cb;
1235}
1236
1237void
1238SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, SSL_SESSION *(*cb)(struct ssl_st *ssl,
1239 const unsigned char *data, int len, int *copy))
1240{
1241 ctx->get_session_cb = cb;
1242}
1243
1244SSL_SESSION *
1245(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, const unsigned char *data,
1246 int len, int *copy)
1247{
1248 return ctx->get_session_cb;
1249}
1250
1251void
1252SSL_CTX_set_info_callback(SSL_CTX *ctx,
1253 void (*cb)(const SSL *ssl, int type, int val))
1254{
1255 ctx->info_callback = cb;
1256}
1257
1258void
1259(*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type, int val)
1260{
1261 return ctx->info_callback;
1262}
1263
1264void
1265SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1266 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
1267{
1268 ctx->client_cert_cb = cb;
1269}
1270
1271int
1272(*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509,
1273 EVP_PKEY **pkey)
1274{
1275 return ctx->client_cert_cb;
1276}
1277
1278#ifndef OPENSSL_NO_ENGINE
1279int
1280SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1281{
1282 if (!ENGINE_init(e)) {
1283 SSLerrorx(ERR_R_ENGINE_LIB);
1284 return 0;
1285 }
1286 if (!ENGINE_get_ssl_client_cert_function(e)) {
1287 SSLerrorx(SSL_R_NO_CLIENT_CERT_METHOD);
1288 ENGINE_finish(e);
1289 return 0;
1290 }
1291 ctx->client_cert_engine = e;
1292 return 1;
1293}
1294#endif
1295
1296void
1297SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1298 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
1299{
1300 ctx->app_gen_cookie_cb = cb;
1301}
1302
1303void
1304SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1305 int (*cb)(SSL *ssl, const unsigned char *cookie, unsigned int cookie_len))
1306{
1307 ctx->app_verify_cookie_cb = cb;
1308}
1309
1310int
1311PEM_write_SSL_SESSION(FILE *fp, SSL_SESSION *x)
1312{
1313 return PEM_ASN1_write((i2d_of_void *)i2d_SSL_SESSION,
1314 PEM_STRING_SSL_SESSION, fp, x, NULL, NULL, 0, NULL, NULL);
1315}
1316
1317SSL_SESSION *
1318PEM_read_SSL_SESSION(FILE *fp, SSL_SESSION **x, pem_password_cb *cb, void *u)
1319{
1320 return PEM_ASN1_read((d2i_of_void *)d2i_SSL_SESSION,
1321 PEM_STRING_SSL_SESSION, fp, (void **)x, cb, u);
1322}
1323
1324SSL_SESSION *
1325PEM_read_bio_SSL_SESSION(BIO *bp, SSL_SESSION **x, pem_password_cb *cb, void *u)
1326{
1327 return PEM_ASN1_read_bio((d2i_of_void *)d2i_SSL_SESSION,
1328 PEM_STRING_SSL_SESSION, bp, (void **)x, cb, u);
1329}
1330
1331int
1332PEM_write_bio_SSL_SESSION(BIO *bp, SSL_SESSION *x)
1333{
1334 return PEM_ASN1_write_bio((i2d_of_void *)i2d_SSL_SESSION,
1335 PEM_STRING_SSL_SESSION, bp, x, NULL, NULL, 0, NULL, NULL);
1336}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-11 18:18:02 +0000