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#ifndef OPENSSL_NO_SRP 222 ss->srp_username=NULL; 223#endif 224 return(ss); 225 } 226 227const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) 228 { 229 if(len) 230 *len = s->session_id_length; 231 return s->session_id; 232 } 233 234unsigned int SSL_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 def_generate_session_id(const SSL *ssl, unsigned char *id, 250 unsigned int *id_len) 251{ 252 unsigned int retry = 0; 253 do 254 if (RAND_pseudo_bytes(id, *id_len) <= 0) 255 return 0; 256 while(SSL_has_matching_session_id(ssl, id, *id_len) && 257 (++retry < MAX_SESS_ID_ATTEMPTS)); 258 if(retry < MAX_SESS_ID_ATTEMPTS) 259 return 1; 260 /* else - woops a session_id match */ 261 /* XXX We should also check the external cache -- 262 * but the probability of a collision is negligible, and 263 * we could not prevent the concurrent creation of sessions 264 * with identical IDs since we currently don't have means 265 * to atomically check whether a session ID already exists 266 * and make a reservation for it if it does not 267 * (this problem applies to the internal cache as well). 268 */ 269 return 0; 270} 271 272void SSL_set_session_creation_enabled (SSL *s, int creation_enabled) 273 { 274 s->session_creation_enabled = creation_enabled; 275 } 276 277int ssl_get_new_session(SSL *s, int session) 278 { 279 /* This gets used by clients and servers. */ 280 281 unsigned int tmp; 282 SSL_SESSION *ss=NULL; 283 GEN_SESSION_CB cb = def_generate_session_id; 284 285 /* caller should check this if they can do better error handling */ 286 if (!s->session_creation_enabled) return(0); 287 if ((ss=SSL_SESSION_new()) == NULL) return(0); 288 289 /* If the context has a default timeout, use it */ 290 if (s->session_ctx->session_timeout == 0) 291 ss->timeout=SSL_get_default_timeout(s); 292 else 293 ss->timeout=s->session_ctx->session_timeout; 294 295 if (s->session != NULL) 296 { 297 SSL_SESSION_free(s->session); 298 s->session=NULL; 299 } 300 301 if (session) 302 { 303 if (s->version == SSL2_VERSION) 304 { 305 ss->ssl_version=SSL2_VERSION; 306 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 307 } 308 else if (s->version == SSL3_VERSION) 309 { 310 ss->ssl_version=SSL3_VERSION; 311 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 312 } 313 else if (s->version == TLS1_VERSION) 314 { 315 ss->ssl_version=TLS1_VERSION; 316 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 317 } 318 else if (s->version == TLS1_1_VERSION) 319 { 320 ss->ssl_version=TLS1_1_VERSION; 321 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 322 } 323 else if (s->version == TLS1_2_VERSION) 324 { 325 ss->ssl_version=TLS1_2_VERSION; 326 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 327 } 328 else if (s->version == DTLS1_BAD_VER) 329 { 330 ss->ssl_version=DTLS1_BAD_VER; 331 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 332 } 333 else if (s->version == DTLS1_VERSION) 334 { 335 ss->ssl_version=DTLS1_VERSION; 336 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 337 } 338 else 339 { 340 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 341 SSL_SESSION_free(ss); 342 return(0); 343 } 344#ifndef OPENSSL_NO_TLSEXT 345 /* If RFC4507 ticket use empty session ID */ 346 if (s->tlsext_ticket_expected) 347 { 348 ss->session_id_length = 0; 349 goto sess_id_done; 350 } 351#endif 352 /* Choose which callback will set the session ID */ 353 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 354 if(s->generate_session_id) 355 cb = s->generate_session_id; 356 else if(s->session_ctx->generate_session_id) 357 cb = s->session_ctx->generate_session_id; 358 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 359 /* Choose a session ID */ 360 tmp = ss->session_id_length; 361 if(!cb(s, ss->session_id, &tmp)) 362 { 363 /* The callback failed */ 364 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 365 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 366 SSL_SESSION_free(ss); 367 return(0); 368 } 369 /* Don't allow the callback to set the session length to zero. 370 * nor set it higher than it was. */ 371 if(!tmp || (tmp > ss->session_id_length)) 372 { 373 /* The callback set an illegal length */ 374 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 375 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 376 SSL_SESSION_free(ss); 377 return(0); 378 } 379 /* If the session length was shrunk and we're SSLv2, pad it */ 380 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 381 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 382 else 383 ss->session_id_length = tmp; 384 /* Finally, check for a conflict */ 385 if(SSL_has_matching_session_id(s, ss->session_id, 386 ss->session_id_length)) 387 { 388 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 389 SSL_R_SSL_SESSION_ID_CONFLICT); 390 SSL_SESSION_free(ss); 391 return(0); 392 } 393#ifndef OPENSSL_NO_TLSEXT 394 sess_id_done: 395 if (s->tlsext_hostname) { 396 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 397 if (ss->tlsext_hostname == NULL) { 398 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 399 SSL_SESSION_free(ss); 400 return 0; 401 } 402 } 403#ifndef OPENSSL_NO_EC 404 if (s->tlsext_ecpointformatlist) 405 { 406 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 407 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) 408 { 409 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 410 SSL_SESSION_free(ss); 411 return 0; 412 } 413 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 414 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 415 } 416 if (s->tlsext_ellipticcurvelist) 417 { 418 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 419 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 420 { 421 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 422 SSL_SESSION_free(ss); 423 return 0; 424 } 425 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 426 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 427 } 428#endif 429#endif 430 } 431 else 432 { 433 ss->session_id_length=0; 434 } 435 436 if (s->sid_ctx_length > sizeof ss->sid_ctx) 437 { 438 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 439 SSL_SESSION_free(ss); 440 return 0; 441 } 442 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 443 ss->sid_ctx_length=s->sid_ctx_length; 444 s->session=ss; 445 ss->ssl_version=s->version; 446 ss->verify_result = X509_V_OK; 447 448 return(1); 449 } 450 451/* ssl_get_prev attempts to find an SSL_SESSION to be used to resume this 452 * connection. It is only called by servers. 453 * 454 * session_id: points at the session ID in the ClientHello. This code will 455 * read past the end of this in order to parse out the session ticket 456 * extension, if any. 457 * len: the length of the session ID. 458 * limit: a pointer to the first byte after the ClientHello. 459 * 460 * Returns: 461 * -1: error 462 * 0: a session may have been found. 463 * 464 * Side effects: 465 * - If a session is found then s->session is pointed at it (after freeing an 466 * existing session if need be) and s->verify_result is set from the session. 467 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1 468 * if the server should issue a new session ticket (to 0 otherwise). 469 */ 470int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 471 const unsigned char *limit) 472 { 473 /* This is used only by servers. */ 474 475 SSL_SESSION *ret=NULL; 476 int fatal = 0; 477 int try_session_cache = 1; 478#ifndef OPENSSL_NO_TLSEXT 479 int r; 480#endif 481 482 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 483 goto err; 484 485 if (len == 0) 486 try_session_cache = 0; 487 488#ifndef OPENSSL_NO_TLSEXT 489 r = tls1_process_ticket(s, session_id, len, limit, &ret); /* sets s->tlsext_ticket_expected */ 490 switch (r) 491 { 492 case -1: /* Error during processing */ 493 fatal = 1; 494 goto err; 495 case 0: /* No ticket found */ 496 case 1: /* Zero length ticket found */ 497 break; /* Ok to carry on processing session id. */ 498 case 2: /* Ticket found but not decrypted. */ 499 case 3: /* Ticket decrypted, *ret has been set. */ 500 try_session_cache = 0; 501 break; 502 default: 503 abort(); 504 } 505#endif 506 507 if (try_session_cache && 508 ret == NULL && 509 !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 510 { 511 SSL_SESSION data; 512 data.ssl_version=s->version; 513 data.session_id_length=len; 514 if (len == 0) 515 return 0; 516 memcpy(data.session_id,session_id,len); 517 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 518 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data); 519 if (ret != NULL) 520 { 521 /* don't allow other threads to steal it: */ 522 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 523 } 524 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 525 if (ret == NULL) 526 s->session_ctx->stats.sess_miss++; 527 } 528 529 if (try_session_cache && 530 ret == NULL && 531 s->session_ctx->get_session_cb != NULL) 532 { 533 int copy=1; 534 535 if ((ret=s->session_ctx->get_session_cb(s,session_id,len,©))) 536 { 537 s->session_ctx->stats.sess_cb_hit++; 538 539 /* Increment reference count now if the session callback 540 * asks us to do so (note that if the session structures 541 * returned by the callback are shared between threads, 542 * it must handle the reference count itself [i.e. copy == 0], 543 * or things won't be thread-safe). */ 544 if (copy) 545 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 546 547 /* Add the externally cached session to the internal 548 * cache as well if and only if we are supposed to. */ 549 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 550 /* The following should not return 1, otherwise, 551 * things are very strange */ 552 SSL_CTX_add_session(s->session_ctx,ret); 553 } 554 } 555 556 if (ret == NULL) 557 goto err; 558 559 /* Now ret is non-NULL and we own one of its reference counts. */ 560 561 if (ret->sid_ctx_length != s->sid_ctx_length 562 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 563 { 564 /* We have the session requested by the client, but we don't 565 * want to use it in this context. */ 566 goto err; /* treat like cache miss */ 567 } 568 569 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 570 { 571 /* We can't be sure if this session is being used out of 572 * context, which is especially important for SSL_VERIFY_PEER. 573 * The application should have used SSL[_CTX]_set_session_id_context. 574 * 575 * For this error case, we generate an error instead of treating 576 * the event like a cache miss (otherwise it would be easy for 577 * applications to effectively disable the session cache by 578 * accident without anyone noticing). 579 */ 580 581 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 582 fatal = 1; 583 goto err; 584 } 585 586 if (ret->cipher == NULL) 587 { 588 unsigned char buf[5],*p; 589 unsigned long l; 590 591 p=buf; 592 l=ret->cipher_id; 593 l2n(l,p); 594 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 595 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 596 else 597 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 598 if (ret->cipher == NULL) 599 goto err; 600 } 601 602 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 603 { 604 s->session_ctx->stats.sess_timeout++; 605 if (try_session_cache) 606 { 607 /* session was from the cache, so remove it */ 608 SSL_CTX_remove_session(s->session_ctx,ret); 609 } 610 goto err; 611 } 612 613 s->session_ctx->stats.sess_hit++; 614 615 if (s->session != NULL) 616 SSL_SESSION_free(s->session); 617 s->session=ret; 618 s->verify_result = s->session->verify_result; 619 return 1; 620 621 err: 622 if (ret != NULL) 623 { 624 SSL_SESSION_free(ret); 625#ifndef OPENSSL_NO_TLSEXT 626 if (!try_session_cache) 627 { 628 /* The session was from a ticket, so we should 629 * issue a ticket for the new session */ 630 s->tlsext_ticket_expected = 1; 631 } 632#endif 633 } 634 if (fatal) 635 return -1; 636 else 637 return 0; 638 } 639 640int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 641 { 642 int ret=0; 643 SSL_SESSION *s; 644 645 /* add just 1 reference count for the SSL_CTX's session cache 646 * even though it has two ways of access: each session is in a 647 * doubly linked list and an lhash */ 648 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 649 /* if session c is in already in cache, we take back the increment later */ 650 651 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 652 s=lh_SSL_SESSION_insert(ctx->sessions,c); 653 654 /* s != NULL iff we already had a session with the given PID. 655 * In this case, s == c should hold (then we did not really modify 656 * ctx->sessions), or we're in trouble. */ 657 if (s != NULL && s != c) 658 { 659 /* We *are* in trouble ... */ 660 SSL_SESSION_list_remove(ctx,s); 661 SSL_SESSION_free(s); 662 /* ... so pretend the other session did not exist in cache 663 * (we cannot handle two SSL_SESSION structures with identical 664 * session ID in the same cache, which could happen e.g. when 665 * two threads concurrently obtain the same session from an external 666 * cache) */ 667 s = NULL; 668 } 669 670 /* Put at the head of the queue unless it is already in the cache */ 671 if (s == NULL) 672 SSL_SESSION_list_add(ctx,c); 673 674 if (s != NULL) 675 { 676 /* existing cache entry -- decrement previously incremented reference 677 * count because it already takes into account the cache */ 678 679 SSL_SESSION_free(s); /* s == c */ 680 ret=0; 681 } 682 else 683 { 684 /* new cache entry -- remove old ones if cache has become too large */ 685 686 ret=1; 687 688 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 689 { 690 while (SSL_CTX_sess_number(ctx) > 691 SSL_CTX_sess_get_cache_size(ctx)) 692 { 693 if (!remove_session_lock(ctx, 694 ctx->session_cache_tail, 0)) 695 break; 696 else 697 ctx->stats.sess_cache_full++; 698 } 699 } 700 } 701 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 702 return(ret); 703 } 704 705int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 706{ 707 return remove_session_lock(ctx, c, 1); 708} 709 710static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 711 { 712 SSL_SESSION *r; 713 int ret=0; 714 715 if ((c != NULL) && (c->session_id_length != 0)) 716 { 717 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 718 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 719 { 720 ret=1; 721 r=lh_SSL_SESSION_delete(ctx->sessions,c); 722 SSL_SESSION_list_remove(ctx,c); 723 } 724 725 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 726 727 if (ret) 728 { 729 r->not_resumable=1; 730 if (ctx->remove_session_cb != NULL) 731 ctx->remove_session_cb(ctx,r); 732 SSL_SESSION_free(r); 733 } 734 } 735 else 736 ret=0; 737 return(ret); 738 } 739 740void SSL_SESSION_free(SSL_SESSION *ss) 741 { 742 int i; 743 744 if(ss == NULL) 745 return; 746 747 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 748#ifdef REF_PRINT 749 REF_PRINT("SSL_SESSION",ss); 750#endif 751 if (i > 0) return; 752#ifdef REF_CHECK 753 if (i < 0) 754 { 755 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 756 abort(); /* ok */ 757 } 758#endif 759 760 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 761 762 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 763 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 764 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 765 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 766 if (ss->peer != NULL) X509_free(ss->peer); 767 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 768#ifndef OPENSSL_NO_TLSEXT 769 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 770 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 771#ifndef OPENSSL_NO_EC 772 ss->tlsext_ecpointformatlist_length = 0; 773 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 774 ss->tlsext_ellipticcurvelist_length = 0; 775 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 776#endif /* OPENSSL_NO_EC */ 777#endif 778#ifndef OPENSSL_NO_PSK 779 if (ss->psk_identity_hint != NULL) 780 OPENSSL_free(ss->psk_identity_hint); 781 if (ss->psk_identity != NULL) 782 OPENSSL_free(ss->psk_identity); 783#endif 784#ifndef OPENSSL_NO_SRP 785 if (ss->srp_username != NULL) 786 OPENSSL_free(ss->srp_username); 787#endif 788 OPENSSL_cleanse(ss,sizeof(*ss)); 789 OPENSSL_free(ss); 790 } 791 792int SSL_set_session(SSL *s, SSL_SESSION *session) 793 { 794 int ret=0; 795 const SSL_METHOD *meth; 796 797 if (session != NULL) 798 { 799 meth=s->ctx->method->get_ssl_method(session->ssl_version); 800 if (meth == NULL) 801 meth=s->method->get_ssl_method(session->ssl_version); 802 if (meth == NULL) 803 { 804 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 805 return(0); 806 } 807 808 if (meth != s->method) 809 { 810 if (!SSL_set_ssl_method(s,meth)) 811 return(0); 812 } 813 814#ifndef OPENSSL_NO_KRB5 815 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 816 session->krb5_client_princ_len > 0) 817 { 818 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 819 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 820 session->krb5_client_princ_len); 821 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 822 } 823#endif /* OPENSSL_NO_KRB5 */ 824 825 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 826 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 827 if (s->session != NULL) 828 SSL_SESSION_free(s->session); 829 s->session=session; 830 s->verify_result = s->session->verify_result; 831 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 832 ret=1; 833 } 834 else 835 { 836 if (s->session != NULL) 837 { 838 SSL_SESSION_free(s->session); 839 s->session=NULL; 840 } 841 842 meth=s->ctx->method; 843 if (meth != s->method) 844 { 845 if (!SSL_set_ssl_method(s,meth)) 846 return(0); 847 } 848 ret=1; 849 } 850 return(ret); 851 } 852 853long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 854 { 855 if (s == NULL) return(0); 856 s->timeout=t; 857 return(1); 858 } 859 860long SSL_SESSION_get_timeout(const SSL_SESSION *s) 861 { 862 if (s == NULL) return(0); 863 return(s->timeout); 864 } 865 866long SSL_SESSION_get_time(const SSL_SESSION *s) 867 { 868 if (s == NULL) return(0); 869 return(s->time); 870 } 871 872long SSL_SESSION_set_time(SSL_SESSION *s, long t) 873 { 874 if (s == NULL) return(0); 875 s->time=t; 876 return(t); 877 } 878 879X509 *SSL_SESSION_get0_peer(SSL_SESSION *s) 880 { 881 return s->peer; 882 } 883 884int SSL_SESSION_set1_id_context(SSL_SESSION *s,const unsigned char *sid_ctx, 885 unsigned int sid_ctx_len) 886 { 887 if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) 888 { 889 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); 890 return 0; 891 } 892 s->sid_ctx_length=sid_ctx_len; 893 memcpy(s->sid_ctx,sid_ctx,sid_ctx_len); 894 895 return 1; 896 } 897 898long SSL_CTX_set_timeout(SSL_CTX *s, long t) 899 { 900 long l; 901 if (s == NULL) return(0); 902 l=s->session_timeout; 903 s->session_timeout=t; 904 return(l); 905 } 906 907long SSL_CTX_get_timeout(const SSL_CTX *s) 908 { 909 if (s == NULL) return(0); 910 return(s->session_timeout); 911 } 912 913#ifndef OPENSSL_NO_TLSEXT 914int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 915 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 916 { 917 if (s == NULL) return(0); 918 s->tls_session_secret_cb = tls_session_secret_cb; 919 s->tls_session_secret_cb_arg = arg; 920 return(1); 921 } 922 923int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 924 void *arg) 925 { 926 if (s == NULL) return(0); 927 s->tls_session_ticket_ext_cb = cb; 928 s->tls_session_ticket_ext_cb_arg = arg; 929 return(1); 930 } 931 932int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 933 { 934 if (s->version >= TLS1_VERSION) 935 { 936 if (s->tlsext_session_ticket) 937 { 938 OPENSSL_free(s->tlsext_session_ticket); 939 s->tlsext_session_ticket = NULL; 940 } 941 942 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 943 if (!s->tlsext_session_ticket) 944 { 945 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 946 return 0; 947 } 948 949 if (ext_data) 950 { 951 s->tlsext_session_ticket->length = ext_len; 952 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 953 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 954 } 955 else 956 { 957 s->tlsext_session_ticket->length = 0; 958 s->tlsext_session_ticket->data = NULL; 959 } 960 961 return 1; 962 } 963 964 return 0; 965 } 966#endif /* OPENSSL_NO_TLSEXT */ 967 968typedef struct timeout_param_st 969 { 970 SSL_CTX *ctx; 971 long time; 972 LHASH_OF(SSL_SESSION) *cache; 973 } TIMEOUT_PARAM; 974 975static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 976 { 977 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 978 { 979 /* The reason we don't call SSL_CTX_remove_session() is to 980 * save on locking overhead */ 981 (void)lh_SSL_SESSION_delete(p->cache,s); 982 SSL_SESSION_list_remove(p->ctx,s); 983 s->not_resumable=1; 984 if (p->ctx->remove_session_cb != NULL) 985 p->ctx->remove_session_cb(p->ctx,s); 986 SSL_SESSION_free(s); 987 } 988 } 989 990static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 991 992void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 993 { 994 unsigned long i; 995 TIMEOUT_PARAM tp; 996 997 tp.ctx=s; 998 tp.cache=s->sessions; 999 if (tp.cache == NULL) return; 1000 tp.time=t; 1001 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 1002 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 1003 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0; 1004 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 1005 TIMEOUT_PARAM, &tp); 1006 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i; 1007 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 1008 } 1009 1010int ssl_clear_bad_session(SSL *s) 1011 { 1012 if ( (s->session != NULL) && 1013 !(s->shutdown & SSL_SENT_SHUTDOWN) && 1014 !(SSL_in_init(s) || SSL_in_before(s))) 1015 { 1016 SSL_CTX_remove_session(s->ctx,s->session); 1017 return(1); 1018 } 1019 else 1020 return(0); 1021 } 1022 1023/* locked by SSL_CTX in the calling function */ 1024static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 1025 { 1026 if ((s->next == NULL) || (s->prev == NULL)) return; 1027 1028 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 1029 { /* last element in list */ 1030 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1031 { /* only one element in list */ 1032 ctx->session_cache_head=NULL; 1033 ctx->session_cache_tail=NULL; 1034 } 1035 else 1036 { 1037 ctx->session_cache_tail=s->prev; 1038 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1039 } 1040 } 1041 else 1042 { 1043 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1044 { /* first element in list */ 1045 ctx->session_cache_head=s->next; 1046 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1047 } 1048 else 1049 { /* middle of list */ 1050 s->next->prev=s->prev; 1051 s->prev->next=s->next; 1052 } 1053 } 1054 s->prev=s->next=NULL; 1055 } 1056 1057static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 1058 { 1059 if ((s->next != NULL) && (s->prev != NULL)) 1060 SSL_SESSION_list_remove(ctx,s); 1061 1062 if (ctx->session_cache_head == NULL) 1063 { 1064 ctx->session_cache_head=s; 1065 ctx->session_cache_tail=s; 1066 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1067 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1068 } 1069 else 1070 { 1071 s->next=ctx->session_cache_head; 1072 s->next->prev=s; 1073 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1074 ctx->session_cache_head=s; 1075 } 1076 } 1077 1078void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 1079 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 1080 { 1081 ctx->new_session_cb=cb; 1082 } 1083 1084int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1085 { 1086 return ctx->new_session_cb; 1087 } 1088 1089void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1090 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1091 { 1092 ctx->remove_session_cb=cb; 1093 } 1094 1095void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1096 { 1097 return ctx->remove_session_cb; 1098 } 1099 1100void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1101 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1102 unsigned char *data,int len,int *copy)) 1103 { 1104 ctx->get_session_cb=cb; 1105 } 1106 1107SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1108 unsigned char *data,int len,int *copy) 1109 { 1110 return ctx->get_session_cb; 1111 } 1112 1113void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1114 void (*cb)(const SSL *ssl,int type,int val)) 1115 { 1116 ctx->info_callback=cb; 1117 } 1118 1119void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1120 { 1121 return ctx->info_callback; 1122 } 1123 1124void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1125 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1126 { 1127 ctx->client_cert_cb=cb; 1128 } 1129 1130int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1131 { 1132 return ctx->client_cert_cb; 1133 } 1134 1135#ifndef OPENSSL_NO_ENGINE 1136int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1137 { 1138 if (!ENGINE_init(e)) 1139 { 1140 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1141 return 0; 1142 } 1143 if(!ENGINE_get_ssl_client_cert_function(e)) 1144 { 1145 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1146 ENGINE_finish(e); 1147 return 0; 1148 } 1149 ctx->client_cert_engine = e; 1150 return 1; 1151 } 1152#endif 1153 1154void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1155 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1156 { 1157 ctx->app_gen_cookie_cb=cb; 1158 } 1159 1160void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1161 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1162 { 1163 ctx->app_verify_cookie_cb=cb; 1164 } 1165 1166IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1167