ssl_sess.c revision 1.30
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); 149 150/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ 151SSL_SESSION * 152SSL_get_session(const SSL *ssl) 153{ 154 return (ssl->session); 155} 156 157/* variant of SSL_get_session: caller really gets something */ 158SSL_SESSION * 159SSL_get1_session(SSL *ssl) 160{ 161 SSL_SESSION *sess; 162 /* Need to lock this all up rather than just use CRYPTO_add so that 163 * somebody doesn't free ssl->session between when we check it's 164 * non-null and when we up the reference count. */ 165 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 166 sess = ssl->session; 167 if (sess) 168 sess->references++; 169 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 170 return (sess); 171} 172 173int 174SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 175 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 176{ 177 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 178 new_func, dup_func, free_func); 179} 180 181int 182SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 183{ 184 return (CRYPTO_set_ex_data(&s->ex_data, idx, arg)); 185} 186 187void * 188SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 189{ 190 return (CRYPTO_get_ex_data(&s->ex_data, idx)); 191} 192 193SSL_SESSION * 194SSL_SESSION_new(void) 195{ 196 SSL_SESSION *ss; 197 198 ss = calloc(1, sizeof(SSL_SESSION)); 199 if (ss == NULL) { 200 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE); 201 return (0); 202 } 203 204 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 205 ss->references = 1; 206 ss->timeout=60*5+4; /* 5 minute timeout by default */ 207 ss->time = time(NULL); 208 ss->prev = NULL; 209 ss->next = NULL; 210 ss->compress_meth = 0; 211 ss->tlsext_hostname = NULL; 212 213 ss->tlsext_ecpointformatlist_length = 0; 214 ss->tlsext_ecpointformatlist = NULL; 215 ss->tlsext_ellipticcurvelist_length = 0; 216 ss->tlsext_ellipticcurvelist = NULL; 217 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 218#ifndef OPENSSL_NO_PSK 219 ss->psk_identity_hint = NULL; 220 ss->psk_identity = NULL; 221#endif 222 return (ss); 223} 224 225const unsigned char * 226SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) 227{ 228 if (len) 229 *len = s->session_id_length; 230 return s->session_id; 231} 232 233unsigned int 234SSL_SESSION_get_compress_id(const SSL_SESSION *s) 235{ 236 return s->compress_meth; 237} 238 239/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 240 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 241 * until we have no conflict is going to complete in one iteration pretty much 242 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 243 * and we still can't avoid a conflict - well that's a reasonable point to call 244 * it quits. Either the RAND code is broken or someone is trying to open roughly 245 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 246 * store that many sessions is perhaps a more interesting question ... */ 247 248#define MAX_SESS_ID_ATTEMPTS 10 249static int 250def_generate_session_id(const SSL *ssl, unsigned char *id, 251 unsigned int *id_len) 252{ 253 unsigned int retry = 0; 254 do 255 if (RAND_pseudo_bytes(id, *id_len) <= 0) 256 return 0; 257 while (SSL_has_matching_session_id(ssl, id, *id_len) && 258 (++retry < MAX_SESS_ID_ATTEMPTS)); 259 if (retry < MAX_SESS_ID_ATTEMPTS) 260 return 1; 261 /* else - woops a session_id match */ 262 /* XXX We should also check the external cache -- 263 * but the probability of a collision is negligible, and 264 * we could not prevent the concurrent creation of sessions 265 * with identical IDs since we currently don't have means 266 * to atomically check whether a session ID already exists 267 * and make a reservation for it if it does not 268 * (this problem applies to the internal cache as well). 269 */ 270 return 0; 271} 272 273int 274ssl_get_new_session(SSL *s, int session) 275{ 276 /* This gets used by clients and servers. */ 277 278 unsigned int tmp; 279 SSL_SESSION *ss = NULL; 280 GEN_SESSION_CB cb = def_generate_session_id; 281 282 if ((ss = SSL_SESSION_new()) == NULL) return (0); 283 284 /* If the context has a default timeout, use it */ 285 if (s->session_ctx->session_timeout == 0) 286 ss->timeout = SSL_get_default_timeout(s); 287 else 288 ss->timeout = s->session_ctx->session_timeout; 289 290 if (s->session != NULL) { 291 SSL_SESSION_free(s->session); 292 s->session = NULL; 293 } 294 295 if (session) { 296 switch (s->version) { 297 case SSL3_VERSION: 298 case TLS1_VERSION: 299 case TLS1_1_VERSION: 300 case TLS1_2_VERSION: 301 case DTLS1_BAD_VER: 302 case DTLS1_VERSION: 303 ss->ssl_version = s->version; 304 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; 305 break; 306 default: 307 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 308 SSL_R_UNSUPPORTED_SSL_VERSION); 309 SSL_SESSION_free(ss); 310 return (0); 311 } 312 /* If RFC4507 ticket use empty session ID */ 313 if (s->tlsext_ticket_expected) { 314 ss->session_id_length = 0; 315 goto sess_id_done; 316 } 317 /* Choose which callback will set the session ID */ 318 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 319 if (s->generate_session_id) 320 cb = s->generate_session_id; 321 else if (s->session_ctx->generate_session_id) 322 cb = s->session_ctx->generate_session_id; 323 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 324 /* Choose a session ID */ 325 tmp = ss->session_id_length; 326 if (!cb(s, ss->session_id, &tmp)) { 327 /* The callback failed */ 328 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 329 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 330 SSL_SESSION_free(ss); 331 return (0); 332 } 333 /* Don't allow the callback to set the session length to zero. 334 * nor set it higher than it was. */ 335 if (!tmp || (tmp > ss->session_id_length)) { 336 /* The callback set an illegal length */ 337 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 338 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 339 SSL_SESSION_free(ss); 340 return (0); 341 } 342 ss->session_id_length = tmp; 343 /* Finally, check for a conflict */ 344 if (SSL_has_matching_session_id(s, ss->session_id, 345 ss->session_id_length)) { 346 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 347 SSL_R_SSL_SESSION_ID_CONFLICT); 348 SSL_SESSION_free(ss); 349 return (0); 350 } 351 sess_id_done: 352 if (s->tlsext_hostname) { 353 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 354 if (ss->tlsext_hostname == NULL) { 355 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 356 SSL_SESSION_free(ss); 357 return 0; 358 } 359 } 360 if (s->tlsext_ecpointformatlist) { 361 free(ss->tlsext_ecpointformatlist); 362 if ((ss->tlsext_ecpointformatlist = malloc(s->tlsext_ecpointformatlist_length)) == NULL) { 363 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 364 SSL_SESSION_free(ss); 365 return 0; 366 } 367 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 368 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 369 } 370 if (s->tlsext_ellipticcurvelist) { 371 free(ss->tlsext_ellipticcurvelist); 372 if ((ss->tlsext_ellipticcurvelist = malloc(s->tlsext_ellipticcurvelist_length)) == NULL) { 373 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 374 SSL_SESSION_free(ss); 375 return 0; 376 } 377 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 378 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 379 } 380 } else { 381 ss->session_id_length = 0; 382 } 383 384 if (s->sid_ctx_length > sizeof ss->sid_ctx) { 385 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 386 SSL_SESSION_free(ss); 387 return 0; 388 } 389 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length); 390 ss->sid_ctx_length = s->sid_ctx_length; 391 s->session = ss; 392 ss->ssl_version = s->version; 393 ss->verify_result = X509_V_OK; 394 395 return (1); 396} 397 398/* ssl_get_prev attempts to find an SSL_SESSION to be used to resume this 399 * connection. It is only called by servers. 400 * 401 * session_id: points at the session ID in the ClientHello. This code will 402 * read past the end of this in order to parse out the session ticket 403 * extension, if any. 404 * len: the length of the session ID. 405 * limit: a pointer to the first byte after the ClientHello. 406 * 407 * Returns: 408 * -1: error 409 * 0: a session may have been found. 410 * 411 * Side effects: 412 * - If a session is found then s->session is pointed at it (after freeing an 413 * existing session if need be) and s->verify_result is set from the session. 414 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1 415 * if the server should issue a new session ticket (to 0 otherwise). 416 */ 417int 418ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 419 const unsigned char *limit) 420{ 421 /* This is used only by servers. */ 422 423 SSL_SESSION *ret = NULL; 424 int fatal = 0; 425 int try_session_cache = 1; 426 int r; 427 428 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 429 goto err; 430 431 if (len == 0) 432 try_session_cache = 0; 433 434 r = tls1_process_ticket(s, session_id, len, limit, &ret); /* sets s->tlsext_ticket_expected */ 435 switch (r) { 436 case -1: /* Error during processing */ 437 fatal = 1; 438 goto err; 439 case 0: /* No ticket found */ 440 case 1: /* Zero length ticket found */ 441 break; /* Ok to carry on processing session id. */ 442 case 2: /* Ticket found but not decrypted. */ 443 case 3: /* Ticket decrypted, *ret has been set. */ 444 try_session_cache = 0; 445 break; 446 default: 447 abort(); 448 } 449 450 if (try_session_cache && 451 ret == NULL && 452 !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) { 453 SSL_SESSION data; 454 data.ssl_version = s->version; 455 data.session_id_length = len; 456 if (len == 0) 457 return 0; 458 memcpy(data.session_id, session_id, len); 459 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 460 ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data); 461 if (ret != NULL) { 462 /* don't allow other threads to steal it: */ 463 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); 464 } 465 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 466 if (ret == NULL) 467 s->session_ctx->stats.sess_miss++; 468 } 469 470 if (try_session_cache && 471 ret == NULL && 472 s->session_ctx->get_session_cb != NULL) { 473 int copy = 1; 474 475 if ((ret = s->session_ctx->get_session_cb(s, session_id, len, ©))) { 476 s->session_ctx->stats.sess_cb_hit++; 477 478 /* Increment reference count now if the session callback 479 * asks us to do so (note that if the session structures 480 * returned by the callback are shared between threads, 481 * it must handle the reference count itself [i.e. copy == 0], 482 * or things won't be thread-safe). */ 483 if (copy) 484 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); 485 486 /* Add the externally cached session to the internal 487 * cache as well if and only if we are supposed to. */ 488 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 489 /* The following should not return 1, otherwise, 490 * things are very strange */ 491 SSL_CTX_add_session(s->session_ctx, ret); 492 } 493 } 494 495 if (ret == NULL) 496 goto err; 497 498 /* Now ret is non-NULL and we own one of its reference counts. */ 499 500 if (ret->sid_ctx_length != s->sid_ctx_length 501 || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) { 502 /* We have the session requested by the client, but we don't 503 * want to use it in this context. */ 504 goto err; /* treat like cache miss */ 505 } 506 507 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) { 508 /* We can't be sure if this session is being used out of 509 * context, which is especially important for SSL_VERIFY_PEER. 510 * The application should have used SSL[_CTX]_set_session_id_context. 511 * 512 * For this error case, we generate an error instead of treating 513 * the event like a cache miss (otherwise it would be easy for 514 * applications to effectively disable the session cache by 515 * accident without anyone noticing). 516 */ 517 518 SSLerr(SSL_F_SSL_GET_PREV_SESSION, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 519 fatal = 1; 520 goto err; 521 } 522 523 if (ret->cipher == NULL) { 524 unsigned char buf[5], *p; 525 unsigned long l; 526 527 p = buf; 528 l = ret->cipher_id; 529 l2n(l, p); 530 if ((ret->ssl_version >> 8) >= SSL3_VERSION_MAJOR) 531 ret->cipher = ssl_get_cipher_by_char(s, &(buf[2])); 532 else 533 ret->cipher = ssl_get_cipher_by_char(s, &(buf[1])); 534 if (ret->cipher == NULL) 535 goto err; 536 } 537 538 if (ret->timeout < (time(NULL) - ret->time)) /* timeout */ 539 { 540 s->session_ctx->stats.sess_timeout++; 541 if (try_session_cache) { 542 /* session was from the cache, so remove it */ 543 SSL_CTX_remove_session(s->session_ctx, ret); 544 } 545 goto err; 546 } 547 548 s->session_ctx->stats.sess_hit++; 549 550 if (s->session != NULL) 551 SSL_SESSION_free(s->session); 552 s->session = ret; 553 s->verify_result = s->session->verify_result; 554 return 1; 555 556 err: 557 if (ret != NULL) { 558 SSL_SESSION_free(ret); 559 if (!try_session_cache) { 560 /* The session was from a ticket, so we should 561 * issue a ticket for the new session */ 562 s->tlsext_ticket_expected = 1; 563 } 564 } 565 if (fatal) 566 return -1; 567 else 568 return 0; 569} 570 571int 572SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 573{ 574 int ret = 0; 575 SSL_SESSION *s; 576 577 /* add just 1 reference count for the SSL_CTX's session cache 578 * even though it has two ways of access: each session is in a 579 * doubly linked list and an lhash */ 580 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION); 581 /* if session c is in already in cache, we take back the increment later */ 582 583 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 584 s = lh_SSL_SESSION_insert(ctx->sessions, c); 585 586 /* s != NULL iff we already had a session with the given PID. 587 * In this case, s == c should hold (then we did not really modify 588 * ctx->sessions), or we're in trouble. */ 589 if (s != NULL && s != c) { 590 /* We *are* in trouble ... */ 591 SSL_SESSION_list_remove(ctx, s); 592 SSL_SESSION_free(s); 593 /* ... so pretend the other session did not exist in cache 594 * (we cannot handle two SSL_SESSION structures with identical 595 * session ID in the same cache, which could happen e.g. when 596 * two threads concurrently obtain the same session from an external 597 * cache) */ 598 s = NULL; 599 } 600 601 /* Put at the head of the queue unless it is already in the cache */ 602 if (s == NULL) 603 SSL_SESSION_list_add(ctx, c); 604 605 if (s != NULL) { 606 /* existing cache entry -- decrement previously incremented reference 607 * count because it already takes into account the cache */ 608 609 SSL_SESSION_free(s); /* s == c */ 610 ret = 0; 611 } else { 612 /* new cache entry -- remove old ones if cache has become too large */ 613 614 ret = 1; 615 616 if (SSL_CTX_sess_get_cache_size(ctx) > 0) { 617 while (SSL_CTX_sess_number(ctx) > 618 SSL_CTX_sess_get_cache_size(ctx)) { 619 if (!remove_session_lock(ctx, 620 ctx->session_cache_tail, 0)) 621 break; 622 else 623 ctx->stats.sess_cache_full++; 624 } 625 } 626 } 627 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 628 return (ret); 629} 630 631int 632SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 633{ 634 return remove_session_lock(ctx, c, 1); 635} 636 637static int 638remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 639{ 640 SSL_SESSION *r; 641 int ret = 0; 642 643 if ((c != NULL) && (c->session_id_length != 0)) { 644 if (lck) 645 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 646 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) == c) { 647 ret = 1; 648 r = lh_SSL_SESSION_delete(ctx->sessions, c); 649 SSL_SESSION_list_remove(ctx, c); 650 } 651 652 if (lck) 653 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 654 655 if (ret) { 656 r->not_resumable = 1; 657 if (ctx->remove_session_cb != NULL) 658 ctx->remove_session_cb(ctx, r); 659 SSL_SESSION_free(r); 660 } 661 } else 662 ret = 0; 663 return (ret); 664} 665 666void 667SSL_SESSION_free(SSL_SESSION *ss) 668{ 669 int i; 670 671 if (ss == NULL) 672 return; 673 674 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION); 675 if (i > 0) 676 return; 677 678 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 679 680 OPENSSL_cleanse(ss->master_key, sizeof ss->master_key); 681 OPENSSL_cleanse(ss->session_id, sizeof ss->session_id); 682 if (ss->sess_cert != NULL) 683 ssl_sess_cert_free(ss->sess_cert); 684 if (ss->peer != NULL) 685 X509_free(ss->peer); 686 if (ss->ciphers != NULL) 687 sk_SSL_CIPHER_free(ss->ciphers); 688 free(ss->tlsext_hostname); 689 free(ss->tlsext_tick); 690 ss->tlsext_ecpointformatlist_length = 0; 691 free(ss->tlsext_ecpointformatlist); 692 ss->tlsext_ellipticcurvelist_length = 0; 693 free(ss->tlsext_ellipticcurvelist); 694#ifndef OPENSSL_NO_PSK 695 free(ss->psk_identity_hint); 696 free(ss->psk_identity); 697#endif 698 OPENSSL_cleanse(ss, sizeof(*ss)); 699 free(ss); 700} 701 702int 703SSL_set_session(SSL *s, SSL_SESSION *session) 704{ 705 int ret = 0; 706 const SSL_METHOD *meth; 707 708 if (session != NULL) { 709 meth = s->ctx->method->get_ssl_method(session->ssl_version); 710 if (meth == NULL) 711 meth = s->method->get_ssl_method(session->ssl_version); 712 if (meth == NULL) { 713 SSLerr(SSL_F_SSL_SET_SESSION, SSL_R_UNABLE_TO_FIND_SSL_METHOD); 714 return (0); 715 } 716 717 if (meth != s->method) { 718 if (!SSL_set_ssl_method(s, meth)) 719 return (0); 720 } 721 722 723 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 724 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION); 725 if (s->session != NULL) 726 SSL_SESSION_free(s->session); 727 s->session = session; 728 s->verify_result = s->session->verify_result; 729 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 730 ret = 1; 731 } else { 732 if (s->session != NULL) { 733 SSL_SESSION_free(s->session); 734 s->session = NULL; 735 } 736 737 meth = s->ctx->method; 738 if (meth != s->method) { 739 if (!SSL_set_ssl_method(s, meth)) 740 return (0); 741 } 742 ret = 1; 743 } 744 return (ret); 745} 746 747long 748SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 749{ 750 if (s == NULL) 751 return (0); 752 s->timeout = t; 753 return (1); 754} 755 756long 757SSL_SESSION_get_timeout(const SSL_SESSION *s) 758{ 759 if (s == NULL) 760 return (0); 761 return (s->timeout); 762} 763 764/* XXX 2038 */ 765long 766SSL_SESSION_get_time(const SSL_SESSION *s) 767{ 768 if (s == NULL) 769 return (0); 770 return (s->time); 771} 772 773/* XXX 2038 */ 774long 775SSL_SESSION_set_time(SSL_SESSION *s, long t) 776{ 777 if (s == NULL) 778 return (0); 779 s->time = t; 780 return (t); 781} 782 783X509 * 784SSL_SESSION_get0_peer(SSL_SESSION *s) 785{ 786 return s->peer; 787} 788 789int 790SSL_SESSION_set1_id_context(SSL_SESSION *s, const unsigned char *sid_ctx, 791 unsigned int sid_ctx_len) 792{ 793 if (sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) { 794 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT, SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); 795 return 0; 796 } 797 s->sid_ctx_length = sid_ctx_len; 798 memcpy(s->sid_ctx, sid_ctx, sid_ctx_len); 799 800 return 1; 801} 802 803long 804SSL_CTX_set_timeout(SSL_CTX *s, long t) 805{ 806 long l; 807 if (s == NULL) 808 return (0); 809 l = s->session_timeout; 810 s->session_timeout = t; 811 return (l); 812} 813 814long 815SSL_CTX_get_timeout(const SSL_CTX *s) 816{ 817 if (s == NULL) 818 return (0); 819 return (s->session_timeout); 820} 821 822int 823SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 824 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 825{ 826 if (s == NULL) 827 return (0); 828 s->tls_session_secret_cb = tls_session_secret_cb; 829 s->tls_session_secret_cb_arg = arg; 830 return (1); 831} 832 833int 834SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 835 void *arg) 836{ 837 if (s == NULL) 838 return (0); 839 s->tls_session_ticket_ext_cb = cb; 840 s->tls_session_ticket_ext_cb_arg = arg; 841 return (1); 842} 843 844int 845SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 846{ 847 if (s->version >= TLS1_VERSION) { 848 free(s->tlsext_session_ticket); 849 s->tlsext_session_ticket = malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 850 if (!s->tlsext_session_ticket) { 851 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 852 return 0; 853 } 854 855 if (ext_data) { 856 s->tlsext_session_ticket->length = ext_len; 857 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 858 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 859 } else { 860 s->tlsext_session_ticket->length = 0; 861 s->tlsext_session_ticket->data = NULL; 862 } 863 864 return 1; 865 } 866 867 return 0; 868} 869 870typedef struct timeout_param_st { 871 SSL_CTX *ctx; 872 long time; 873 LHASH_OF(SSL_SESSION) *cache; 874} TIMEOUT_PARAM; 875 876static void 877timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 878{ 879 if ((p->time == 0) || (p->time > (s->time + s->timeout))) /* timeout */ 880 { 881 /* The reason we don't call SSL_CTX_remove_session() is to 882 * save on locking overhead */ 883 (void)lh_SSL_SESSION_delete(p->cache, s); 884 SSL_SESSION_list_remove(p->ctx, s); 885 s->not_resumable = 1; 886 if (p->ctx->remove_session_cb != NULL) 887 p->ctx->remove_session_cb(p->ctx, s); 888 SSL_SESSION_free(s); 889 } 890} 891 892static 893IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 894 895/* XXX 2038 */ 896void 897SSL_CTX_flush_sessions(SSL_CTX *s, long t) 898{ 899 unsigned long i; 900 TIMEOUT_PARAM tp; 901 902 tp.ctx = s; 903 tp.cache = s->sessions; 904 if (tp.cache == NULL) 905 return; 906 tp.time = t; 907 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 908 i = CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 909 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = 0; 910 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 911 TIMEOUT_PARAM, &tp); 912 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load = i; 913 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 914} 915 916int 917ssl_clear_bad_session(SSL *s) 918{ 919 if ((s->session != NULL) && 920 !(s->shutdown & SSL_SENT_SHUTDOWN) && 921 !(SSL_in_init(s) || SSL_in_before(s))) { 922 SSL_CTX_remove_session(s->ctx, s->session); 923 return (1); 924 } else 925 return (0); 926} 927 928/* locked by SSL_CTX in the calling function */ 929static void 930SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 931{ 932 if ((s->next == NULL) 933 || (s->prev == NULL)) return; 934 935 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 936 { /* last element in list */ 937 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 938 { /* only one element in list */ 939 ctx->session_cache_head = NULL; 940 ctx->session_cache_tail = NULL; 941 } else { 942 ctx->session_cache_tail = s->prev; 943 s->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail); 944 } 945 } else { 946 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 947 { /* first element in list */ 948 ctx->session_cache_head = s->next; 949 s->next->prev = (SSL_SESSION *)&(ctx->session_cache_head); 950 } else 951 { /* middle of list */ 952 s->next->prev = s->prev; 953 s->prev->next = s->next; 954 } 955 } 956 s->prev = s->next = NULL; 957} 958 959static void 960SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 961{ 962 if ((s->next != NULL) && (s->prev != NULL)) 963 SSL_SESSION_list_remove(ctx, s); 964 965 if (ctx->session_cache_head == NULL) { 966 ctx->session_cache_head = s; 967 ctx->session_cache_tail = s; 968 s->prev = (SSL_SESSION *)&(ctx->session_cache_head); 969 s->next = (SSL_SESSION *)&(ctx->session_cache_tail); 970 } else { 971 s->next = ctx->session_cache_head; 972 s->next->prev = s; 973 s->prev = (SSL_SESSION *)&(ctx->session_cache_head); 974 ctx->session_cache_head = s; 975 } 976} 977 978void 979SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 980 int (*cb)(struct ssl_st *ssl, SSL_SESSION *sess)) { 981 ctx->new_session_cb = cb; 982} 983 984int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 985{ 986 return ctx->new_session_cb; 987} 988 989void 990SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 991 void (*cb)(SSL_CTX *ctx, SSL_SESSION *sess)) 992{ 993 ctx->remove_session_cb = cb; 994} 995 996void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx, SSL_SESSION *sess) 997{ 998 return ctx->remove_session_cb; 999} 1000 1001void 1002SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1003 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1004unsigned char *data, int len, int *copy)) 1005{ 1006 ctx->get_session_cb = cb; 1007} 1008 1009SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1010 unsigned char *data, int len, int *copy) 1011{ 1012 return ctx->get_session_cb; 1013} 1014 1015void 1016SSL_CTX_set_info_callback(SSL_CTX *ctx, 1017 void (*cb)(const SSL *ssl, int type, int val)) 1018{ 1019 ctx->info_callback = cb; 1020} 1021 1022void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl, int type, int val) 1023{ 1024 return ctx->info_callback; 1025} 1026 1027void 1028SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1029 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1030{ 1031 ctx->client_cert_cb = cb; 1032} 1033 1034int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1035{ 1036 return ctx->client_cert_cb; 1037} 1038 1039#ifndef OPENSSL_NO_ENGINE 1040int 1041SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1042{ 1043 if (!ENGINE_init(e)) { 1044 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1045 return 0; 1046 } 1047 if (!ENGINE_get_ssl_client_cert_function(e)) { 1048 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1049 ENGINE_finish(e); 1050 return 0; 1051 } 1052 ctx->client_cert_engine = e; 1053 return 1; 1054} 1055#endif 1056 1057void 1058SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1059 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1060{ 1061 ctx->app_gen_cookie_cb = cb; 1062} 1063 1064void 1065SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1066 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1067{ 1068 ctx->app_verify_cookie_cb = cb; 1069} 1070 1071IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1072