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1/* ssl/ssl_sess.c */
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 <stdio.h>
139#include <openssl/lhash.h>
140#include <openssl/rand.h>
141#ifndef OPENSSL_NO_ENGINE
142#include <openssl/engine.h>
143#endif
144#include "ssl_locl.h"
145
146static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s);
147static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s);
148static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck);
149
150SSL_SESSION *SSL_get_session(const SSL *ssl)
151/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */
152 {
153 return(ssl->session);
154 }
155
156SSL_SESSION *SSL_get1_session(SSL *ssl)
157/* variant of SSL_get_session: caller really gets something */
158 {
159 SSL_SESSION *sess;
160 /* Need to lock this all up rather than just use CRYPTO_add so that
161 * somebody doesn't free ssl->session between when we check it's
162 * non-null and when we up the reference count. */
163 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION);
164 sess = ssl->session;
165 if(sess)
166 sess->references++;
167 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION);
168 return(sess);
169 }
170
171int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
172 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
173 {
174 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp,
175 new_func, dup_func, free_func);
176 }
177
178int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg)
179 {
180 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
181 }
182
183void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx)
184 {
185 return(CRYPTO_get_ex_data(&s->ex_data,idx));
186 }
187
188SSL_SESSION *SSL_SESSION_new(void)
189 {
190 SSL_SESSION *ss;
191
192 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION));
193 if (ss == NULL)
194 {
195 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE);
196 return(0);
197 }
198 memset(ss,0,sizeof(SSL_SESSION));
199
200 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */
201 ss->references=1;
202 ss->timeout=60*5+4; /* 5 minute timeout by default */
203 ss->time=(unsigned long)time(NULL);
204 ss->prev=NULL;
205 ss->next=NULL;
206 ss->compress_meth=0;
207#ifndef OPENSSL_NO_TLSEXT
208 ss->tlsext_hostname = NULL;
209#ifndef OPENSSL_NO_EC
210 ss->tlsext_ecpointformatlist_length = 0;
211 ss->tlsext_ecpointformatlist = NULL;
212 ss->tlsext_ellipticcurvelist_length = 0;
213 ss->tlsext_ellipticcurvelist = NULL;
214#endif
215#endif
216 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
217#ifndef OPENSSL_NO_PSK
218 ss->psk_identity_hint=NULL;
219 ss->psk_identity=NULL;
220#endif
221 return(ss);
222 }
223
224const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
225 {
226 if(len)
227 *len = s->session_id_length;
228 return s->session_id;
229 }
230
231/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
232 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
233 * until we have no conflict is going to complete in one iteration pretty much
234 * "most" of the time (btw: understatement). So, if it takes us 10 iterations
235 * and we still can't avoid a conflict - well that's a reasonable point to call
236 * it quits. Either the RAND code is broken or someone is trying to open roughly
237 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might
238 * store that many sessions is perhaps a more interesting question ... */
239
240#define MAX_SESS_ID_ATTEMPTS 10
241static int def_generate_session_id(const SSL *ssl, unsigned char *id,
242 unsigned int *id_len)
243{
244 unsigned int retry = 0;
245 do
246 if (RAND_pseudo_bytes(id, *id_len) <= 0)
247 return 0;
248 while(SSL_has_matching_session_id(ssl, id, *id_len) &&
249 (++retry < MAX_SESS_ID_ATTEMPTS));
250 if(retry < MAX_SESS_ID_ATTEMPTS)
251 return 1;
252 /* else - woops a session_id match */
253 /* XXX We should also check the external cache --
254 * but the probability of a collision is negligible, and
255 * we could not prevent the concurrent creation of sessions
256 * with identical IDs since we currently don't have means
257 * to atomically check whether a session ID already exists
258 * and make a reservation for it if it does not
259 * (this problem applies to the internal cache as well).
260 */
261 return 0;
262}
263
264int ssl_get_new_session(SSL *s, int session)
265 {
266 /* This gets used by clients and servers. */
267
268 unsigned int tmp;
269 SSL_SESSION *ss=NULL;
270 GEN_SESSION_CB cb = def_generate_session_id;
271
272 if ((ss=SSL_SESSION_new()) == NULL) return(0);
273
274 /* If the context has a default timeout, use it */
275 if (s->session_ctx->session_timeout == 0)
276 ss->timeout=SSL_get_default_timeout(s);
277 else
278 ss->timeout=s->session_ctx->session_timeout;
279
280 if (s->session != NULL)
281 {
282 SSL_SESSION_free(s->session);
283 s->session=NULL;
284 }
285
286 if (session)
287 {
288 if (s->version == SSL2_VERSION)
289 {
290 ss->ssl_version=SSL2_VERSION;
291 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
292 }
293 else if (s->version == SSL3_VERSION)
294 {
295 ss->ssl_version=SSL3_VERSION;
296 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
297 }
298 else if (s->version == TLS1_VERSION)
299 {
300 ss->ssl_version=TLS1_VERSION;
301 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
302 }
303 else if (s->version == DTLS1_BAD_VER)
304 {
305 ss->ssl_version=DTLS1_BAD_VER;
306 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
307 }
308 else if (s->version == DTLS1_VERSION)
309 {
310 ss->ssl_version=DTLS1_VERSION;
311 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH;
312 }
313 else
314 {
315 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION);
316 SSL_SESSION_free(ss);
317 return(0);
318 }
319#ifndef OPENSSL_NO_TLSEXT
320 /* If RFC4507 ticket use empty session ID */
321 if (s->tlsext_ticket_expected)
322 {
323 ss->session_id_length = 0;
324 goto sess_id_done;
325 }
326#endif
327 /* Choose which callback will set the session ID */
328 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
329 if(s->generate_session_id)
330 cb = s->generate_session_id;
331 else if(s->session_ctx->generate_session_id)
332 cb = s->session_ctx->generate_session_id;
333 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
334 /* Choose a session ID */
335 tmp = ss->session_id_length;
336 if(!cb(s, ss->session_id, &tmp))
337 {
338 /* The callback failed */
339 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
340 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED);
341 SSL_SESSION_free(ss);
342 return(0);
343 }
344 /* Don't allow the callback to set the session length to zero.
345 * nor set it higher than it was. */
346 if(!tmp || (tmp > ss->session_id_length))
347 {
348 /* The callback set an illegal length */
349 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
350 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH);
351 SSL_SESSION_free(ss);
352 return(0);
353 }
354 /* If the session length was shrunk and we're SSLv2, pad it */
355 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION))
356 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp);
357 else
358 ss->session_id_length = tmp;
359 /* Finally, check for a conflict */
360 if(SSL_has_matching_session_id(s, ss->session_id,
361 ss->session_id_length))
362 {
363 SSLerr(SSL_F_SSL_GET_NEW_SESSION,
364 SSL_R_SSL_SESSION_ID_CONFLICT);
365 SSL_SESSION_free(ss);
366 return(0);
367 }
368#ifndef OPENSSL_NO_TLSEXT
369 sess_id_done:
370 if (s->tlsext_hostname) {
371 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
372 if (ss->tlsext_hostname == NULL) {
373 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
374 SSL_SESSION_free(ss);
375 return 0;
376 }
377 }
378#ifndef OPENSSL_NO_EC
379 if (s->tlsext_ecpointformatlist)
380 {
381 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist);
382 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL)
383 {
384 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE);
385 SSL_SESSION_free(ss);
386 return 0;
387 }
388 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length;
389 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
390 }
391 if (s->tlsext_ellipticcurvelist)
392 {
393 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist);
394 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
395 {
396 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE);
397 SSL_SESSION_free(ss);
398 return 0;
399 }
400 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length;
401 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
402 }
403#endif
404#endif
405 }
406 else
407 {
408 ss->session_id_length=0;
409 }
410
411 if (s->sid_ctx_length > sizeof ss->sid_ctx)
412 {
413 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR);
414 SSL_SESSION_free(ss);
415 return 0;
416 }
417 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length);
418 ss->sid_ctx_length=s->sid_ctx_length;
419 s->session=ss;
420 ss->ssl_version=s->version;
421 ss->verify_result = X509_V_OK;
422
423 return(1);
424 }
425
426int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
427 const unsigned char *limit)
428 {
429 /* This is used only by servers. */
430
431 SSL_SESSION *ret=NULL;
432 int fatal = 0;
433#ifndef OPENSSL_NO_TLSEXT
434 int r;
435#endif
436
437 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH)
438 goto err;
439#ifndef OPENSSL_NO_TLSEXT
440 r = tls1_process_ticket(s, session_id, len, limit, &ret);
441 if (r == -1)
442 {
443 fatal = 1;
444 goto err;
445 }
446 else if (r == 0 || (!ret && !len))
447 goto err;
448 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
449#else
450 if (len == 0)
451 goto err;
452 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP))
453#endif
454 {
455 SSL_SESSION data;
456 data.ssl_version=s->version;
457 data.session_id_length=len;
458 if (len == 0)
459 return 0;
460 memcpy(data.session_id,session_id,len);
461 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
462 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data);
463 if (ret != NULL)
464 /* don't allow other threads to steal it: */
465 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
466 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
467 }
468
469 if (ret == NULL)
470 {
471 int copy=1;
472
473 s->session_ctx->stats.sess_miss++;
474 ret=NULL;
475 if (s->session_ctx->get_session_cb != NULL
476 && (ret=s->session_ctx->get_session_cb(s,session_id,len,&copy))
477 != NULL)
478 {
479 s->session_ctx->stats.sess_cb_hit++;
480
481 /* Increment reference count now if the session callback
482 * asks us to do so (note that if the session structures
483 * returned by the callback are shared between threads,
484 * it must handle the reference count itself [i.e. copy == 0],
485 * or things won't be thread-safe). */
486 if (copy)
487 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
488
489 /* Add the externally cached session to the internal
490 * cache as well if and only if we are supposed to. */
491 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE))
492 /* The following should not return 1, otherwise,
493 * things are very strange */
494 SSL_CTX_add_session(s->session_ctx,ret);
495 }
496 if (ret == NULL)
497 goto err;
498 }
499
500 /* Now ret is non-NULL, and we own one of its reference counts. */
501
502 if (ret->sid_ctx_length != s->sid_ctx_length
503 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))
504 {
505 /* We've found the session named by the client, but we don't
506 * want to use it in this context. */
507
508#if 0 /* The client cannot always know when a session is not appropriate,
509 * so we shouldn't generate an error message. */
510
511 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
512#endif
513 goto err; /* treat like cache miss */
514 }
515
516 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0)
517 {
518 /* We can't be sure if this session is being used out of
519 * context, which is especially important for SSL_VERIFY_PEER.
520 * The application should have used SSL[_CTX]_set_session_id_context.
521 *
522 * For this error case, we generate an error instead of treating
523 * the event like a cache miss (otherwise it would be easy for
524 * applications to effectively disable the session cache by
525 * accident without anyone noticing).
526 */
527
528 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
529 fatal = 1;
530 goto err;
531 }
532
533 if (ret->cipher == NULL)
534 {
535 unsigned char buf[5],*p;
536 unsigned long l;
537
538 p=buf;
539 l=ret->cipher_id;
540 l2n(l,p);
541 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR)
542 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2]));
543 else
544 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1]));
545 if (ret->cipher == NULL)
546 goto err;
547 }
548
549
550#if 0 /* This is way too late. */
551
552 /* If a thread got the session, then 'swaped', and another got
553 * it and then due to a time-out decided to 'OPENSSL_free' it we could
554 * be in trouble. So I'll increment it now, then double decrement
555 * later - am I speaking rubbish?. */
556 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION);
557#endif
558
559 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */
560 {
561 s->session_ctx->stats.sess_timeout++;
562 /* remove it from the cache */
563 SSL_CTX_remove_session(s->session_ctx,ret);
564 goto err;
565 }
566
567 s->session_ctx->stats.sess_hit++;
568
569 /* ret->time=time(NULL); */ /* rezero timeout? */
570 /* again, just leave the session
571 * if it is the same session, we have just incremented and
572 * then decremented the reference count :-) */
573 if (s->session != NULL)
574 SSL_SESSION_free(s->session);
575 s->session=ret;
576 s->verify_result = s->session->verify_result;
577 return(1);
578
579 err:
580 if (ret != NULL)
581 SSL_SESSION_free(ret);
582 if (fatal)
583 return -1;
584 else
585 return 0;
586 }
587
588int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
589 {
590 int ret=0;
591 SSL_SESSION *s;
592
593 /* add just 1 reference count for the SSL_CTX's session cache
594 * even though it has two ways of access: each session is in a
595 * doubly linked list and an lhash */
596 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION);
597 /* if session c is in already in cache, we take back the increment later */
598
599 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
600 s=lh_SSL_SESSION_insert(ctx->sessions,c);
601
602 /* s != NULL iff we already had a session with the given PID.
603 * In this case, s == c should hold (then we did not really modify
604 * ctx->sessions), or we're in trouble. */
605 if (s != NULL && s != c)
606 {
607 /* We *are* in trouble ... */
608 SSL_SESSION_list_remove(ctx,s);
609 SSL_SESSION_free(s);
610 /* ... so pretend the other session did not exist in cache
611 * (we cannot handle two SSL_SESSION structures with identical
612 * session ID in the same cache, which could happen e.g. when
613 * two threads concurrently obtain the same session from an external
614 * cache) */
615 s = NULL;
616 }
617
618 /* Put at the head of the queue unless it is already in the cache */
619 if (s == NULL)
620 SSL_SESSION_list_add(ctx,c);
621
622 if (s != NULL)
623 {
624 /* existing cache entry -- decrement previously incremented reference
625 * count because it already takes into account the cache */
626
627 SSL_SESSION_free(s); /* s == c */
628 ret=0;
629 }
630 else
631 {
632 /* new cache entry -- remove old ones if cache has become too large */
633
634 ret=1;
635
636 if (SSL_CTX_sess_get_cache_size(ctx) > 0)
637 {
638 while (SSL_CTX_sess_number(ctx) >
639 SSL_CTX_sess_get_cache_size(ctx))
640 {
641 if (!remove_session_lock(ctx,
642 ctx->session_cache_tail, 0))
643 break;
644 else
645 ctx->stats.sess_cache_full++;
646 }
647 }
648 }
649 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
650 return(ret);
651 }
652
653int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
654{
655 return remove_session_lock(ctx, c, 1);
656}
657
658static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
659 {
660 SSL_SESSION *r;
661 int ret=0;
662
663 if ((c != NULL) && (c->session_id_length != 0))
664 {
665 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
666 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c)
667 {
668 ret=1;
669 r=lh_SSL_SESSION_delete(ctx->sessions,c);
670 SSL_SESSION_list_remove(ctx,c);
671 }
672
673 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
674
675 if (ret)
676 {
677 r->not_resumable=1;
678 if (ctx->remove_session_cb != NULL)
679 ctx->remove_session_cb(ctx,r);
680 SSL_SESSION_free(r);
681 }
682 }
683 else
684 ret=0;
685 return(ret);
686 }
687
688void SSL_SESSION_free(SSL_SESSION *ss)
689 {
690 int i;
691
692 if(ss == NULL)
693 return;
694
695 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION);
696#ifdef REF_PRINT
697 REF_PRINT("SSL_SESSION",ss);
698#endif
699 if (i > 0) return;
700#ifdef REF_CHECK
701 if (i < 0)
702 {
703 fprintf(stderr,"SSL_SESSION_free, bad reference count\n");
704 abort(); /* ok */
705 }
706#endif
707
708 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data);
709
710 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg);
711 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key);
712 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id);
713 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert);
714 if (ss->peer != NULL) X509_free(ss->peer);
715 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers);
716#ifndef OPENSSL_NO_TLSEXT
717 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname);
718 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick);
719#ifndef OPENSSL_NO_EC
720 ss->tlsext_ecpointformatlist_length = 0;
721 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist);
722 ss->tlsext_ellipticcurvelist_length = 0;
723 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist);
724#endif /* OPENSSL_NO_EC */
725#endif
726#ifndef OPENSSL_NO_PSK
727 if (ss->psk_identity_hint != NULL)
728 OPENSSL_free(ss->psk_identity_hint);
729 if (ss->psk_identity != NULL)
730 OPENSSL_free(ss->psk_identity);
731#endif
732 OPENSSL_cleanse(ss,sizeof(*ss));
733 OPENSSL_free(ss);
734 }
735
736int SSL_set_session(SSL *s, SSL_SESSION *session)
737 {
738 int ret=0;
739 const SSL_METHOD *meth;
740
741 if (session != NULL)
742 {
743 meth=s->ctx->method->get_ssl_method(session->ssl_version);
744 if (meth == NULL)
745 meth=s->method->get_ssl_method(session->ssl_version);
746 if (meth == NULL)
747 {
748 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD);
749 return(0);
750 }
751
752 if (meth != s->method)
753 {
754 if (!SSL_set_ssl_method(s,meth))
755 return(0);
756 if (s->ctx->session_timeout == 0)
757 session->timeout=SSL_get_default_timeout(s);
758 else
759 session->timeout=s->ctx->session_timeout;
760 }
761
762#ifndef OPENSSL_NO_KRB5
763 if (s->kssl_ctx && !s->kssl_ctx->client_princ &&
764 session->krb5_client_princ_len > 0)
765 {
766 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1);
767 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ,
768 session->krb5_client_princ_len);
769 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0';
770 }
771#endif /* OPENSSL_NO_KRB5 */
772
773 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/
774 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION);
775 if (s->session != NULL)
776 SSL_SESSION_free(s->session);
777 s->session=session;
778 s->verify_result = s->session->verify_result;
779 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/
780 ret=1;
781 }
782 else
783 {
784 if (s->session != NULL)
785 {
786 SSL_SESSION_free(s->session);
787 s->session=NULL;
788 }
789
790 meth=s->ctx->method;
791 if (meth != s->method)
792 {
793 if (!SSL_set_ssl_method(s,meth))
794 return(0);
795 }
796 ret=1;
797 }
798 return(ret);
799 }
800
801long SSL_SESSION_set_timeout(SSL_SESSION *s, long t)
802 {
803 if (s == NULL) return(0);
804 s->timeout=t;
805 return(1);
806 }
807
808long SSL_SESSION_get_timeout(const SSL_SESSION *s)
809 {
810 if (s == NULL) return(0);
811 return(s->timeout);
812 }
813
814long SSL_SESSION_get_time(const SSL_SESSION *s)
815 {
816 if (s == NULL) return(0);
817 return(s->time);
818 }
819
820long SSL_SESSION_set_time(SSL_SESSION *s, long t)
821 {
822 if (s == NULL) return(0);
823 s->time=t;
824 return(t);
825 }
826
827long SSL_CTX_set_timeout(SSL_CTX *s, long t)
828 {
829 long l;
830 if (s == NULL) return(0);
831 l=s->session_timeout;
832 s->session_timeout=t;
833 return(l);
834 }
835
836long SSL_CTX_get_timeout(const SSL_CTX *s)
837 {
838 if (s == NULL) return(0);
839 return(s->session_timeout);
840 }
841
842#ifndef OPENSSL_NO_TLSEXT
843int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len,
844 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg)
845 {
846 if (s == NULL) return(0);
847 s->tls_session_secret_cb = tls_session_secret_cb;
848 s->tls_session_secret_cb_arg = arg;
849 return(1);
850 }
851
852int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb,
853 void *arg)
854 {
855 if (s == NULL) return(0);
856 s->tls_session_ticket_ext_cb = cb;
857 s->tls_session_ticket_ext_cb_arg = arg;
858 return(1);
859 }
860
861int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len)
862 {
863 if (s->version >= TLS1_VERSION)
864 {
865 if (s->tlsext_session_ticket)
866 {
867 OPENSSL_free(s->tlsext_session_ticket);
868 s->tlsext_session_ticket = NULL;
869 }
870
871 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len);
872 if (!s->tlsext_session_ticket)
873 {
874 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE);
875 return 0;
876 }
877
878 if (ext_data)
879 {
880 s->tlsext_session_ticket->length = ext_len;
881 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1;
882 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len);
883 }
884 else
885 {
886 s->tlsext_session_ticket->length = 0;
887 s->tlsext_session_ticket->data = NULL;
888 }
889
890 return 1;
891 }
892
893 return 0;
894 }
895#endif /* OPENSSL_NO_TLSEXT */
896
897typedef struct timeout_param_st
898 {
899 SSL_CTX *ctx;
900 long time;
901 LHASH_OF(SSL_SESSION) *cache;
902 } TIMEOUT_PARAM;
903
904static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p)
905 {
906 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */
907 {
908 /* The reason we don't call SSL_CTX_remove_session() is to
909 * save on locking overhead */
910 (void)lh_SSL_SESSION_delete(p->cache,s);
911 SSL_SESSION_list_remove(p->ctx,s);
912 s->not_resumable=1;
913 if (p->ctx->remove_session_cb != NULL)
914 p->ctx->remove_session_cb(p->ctx,s);
915 SSL_SESSION_free(s);
916 }
917 }
918
919static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM)
920
921void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
922 {
923 unsigned long i;
924 TIMEOUT_PARAM tp;
925
926 tp.ctx=s;
927 tp.cache=s->sessions;
928 if (tp.cache == NULL) return;
929 tp.time=t;
930 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
931 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load;
932 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0;
933 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout),
934 TIMEOUT_PARAM, &tp);
935 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i;
936 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
937 }
938
939int ssl_clear_bad_session(SSL *s)
940 {
941 if ( (s->session != NULL) &&
942 !(s->shutdown & SSL_SENT_SHUTDOWN) &&
943 !(SSL_in_init(s) || SSL_in_before(s)))
944 {
945 SSL_CTX_remove_session(s->ctx,s->session);
946 return(1);
947 }
948 else
949 return(0);
950 }
951
952/* locked by SSL_CTX in the calling function */
953static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s)
954 {
955 if ((s->next == NULL) || (s->prev == NULL)) return;
956
957 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail))
958 { /* last element in list */
959 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
960 { /* only one element in list */
961 ctx->session_cache_head=NULL;
962 ctx->session_cache_tail=NULL;
963 }
964 else
965 {
966 ctx->session_cache_tail=s->prev;
967 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail);
968 }
969 }
970 else
971 {
972 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head))
973 { /* first element in list */
974 ctx->session_cache_head=s->next;
975 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head);
976 }
977 else
978 { /* middle of list */
979 s->next->prev=s->prev;
980 s->prev->next=s->next;
981 }
982 }
983 s->prev=s->next=NULL;
984 }
985
986static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s)
987 {
988 if ((s->next != NULL) && (s->prev != NULL))
989 SSL_SESSION_list_remove(ctx,s);
990
991 if (ctx->session_cache_head == NULL)
992 {
993 ctx->session_cache_head=s;
994 ctx->session_cache_tail=s;
995 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
996 s->next=(SSL_SESSION *)&(ctx->session_cache_tail);
997 }
998 else
999 {
1000 s->next=ctx->session_cache_head;
1001 s->next->prev=s;
1002 s->prev=(SSL_SESSION *)&(ctx->session_cache_head);
1003 ctx->session_cache_head=s;
1004 }
1005 }
1006
1007void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
1008 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess))
1009 {
1010 ctx->new_session_cb=cb;
1011 }
1012
1013int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess)
1014 {
1015 return ctx->new_session_cb;
1016 }
1017
1018void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
1019 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess))
1020 {
1021 ctx->remove_session_cb=cb;
1022 }
1023
1024void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess)
1025 {
1026 return ctx->remove_session_cb;
1027 }
1028
1029void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
1030 SSL_SESSION *(*cb)(struct ssl_st *ssl,
1031 unsigned char *data,int len,int *copy))
1032 {
1033 ctx->get_session_cb=cb;
1034 }
1035
1036SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl,
1037 unsigned char *data,int len,int *copy)
1038 {
1039 return ctx->get_session_cb;
1040 }
1041
1042void SSL_CTX_set_info_callback(SSL_CTX *ctx,
1043 void (*cb)(const SSL *ssl,int type,int val))
1044 {
1045 ctx->info_callback=cb;
1046 }
1047
1048void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val)
1049 {
1050 return ctx->info_callback;
1051 }
1052
1053void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx,
1054 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey))
1055 {
1056 ctx->client_cert_cb=cb;
1057 }
1058
1059int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey)
1060 {
1061 return ctx->client_cert_cb;
1062 }
1063
1064#ifndef OPENSSL_NO_ENGINE
1065int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e)
1066 {
1067 if (!ENGINE_init(e))
1068 {
1069 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB);
1070 return 0;
1071 }
1072 if(!ENGINE_get_ssl_client_cert_function(e))
1073 {
1074 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD);
1075 ENGINE_finish(e);
1076 return 0;
1077 }
1078 ctx->client_cert_engine = e;
1079 return 1;
1080 }
1081#endif
1082
1083void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx,
1084 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len))
1085 {
1086 ctx->app_gen_cookie_cb=cb;
1087 }
1088
1089void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx,
1090 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len))
1091 {
1092 ctx->app_verify_cookie_cb=cb;
1093 }
1094
1095IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-10-24 19:04:47 +0000