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" 145 146 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s); 147 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s); 148 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck); 149 150 SSL_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 } 155 156 SSL_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 } 170 171 int 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 } 177 178 int 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 } 182 183 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 184 { 185 return(CRYPTO_get_ex_data(&s->ex_data,idx)); 186 } 187 188 SSL_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 } 226 227 const 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 } 233 234 unsigned 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 10 249 static 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 } 271 272 int ssl_get_new_session(SSL *s, int session) 273 { 274 /* This gets used by clients and servers. */ 275 276 unsigned int tmp; 277 SSL_SESSION *ss=NULL; 278 GEN_SESSION_CB cb = def_generate_session_id; 279 280 if ((ss=SSL_SESSION_new()) == NULL) return(0); 281 282 /* If the context has a default timeout, use it */ 283 if (s->session_ctx->session_timeout == 0) 284 ss->timeout=SSL_get_default_timeout(s); 285 else 286 ss->timeout=s->session_ctx->session_timeout; 287 288 if (s->session != NULL) 289 { 290 SSL_SESSION_free(s->session); 291 s->session=NULL; 292 } 293 294 if (session) 295 { 296 if (s->version == SSL2_VERSION) 297 { 298 ss->ssl_version=SSL2_VERSION; 299 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 300 } 301 else if (s->version == SSL3_VERSION) 302 { 303 ss->ssl_version=SSL3_VERSION; 304 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 305 } 306 else if (s->version == TLS1_VERSION) 307 { 308 ss->ssl_version=TLS1_VERSION; 309 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 310 } 311 else if (s->version == TLS1_1_VERSION) 312 { 313 ss->ssl_version=TLS1_1_VERSION; 314 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 315 } 316 else if (s->version == TLS1_2_VERSION) 317 { 318 ss->ssl_version=TLS1_2_VERSION; 319 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 320 } 321 else if (s->version == DTLS1_BAD_VER) 322 { 323 ss->ssl_version=DTLS1_BAD_VER; 324 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 325 } 326 else if (s->version == DTLS1_VERSION) 327 { 328 ss->ssl_version=DTLS1_VERSION; 329 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 330 } 331 else 332 { 333 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 334 SSL_SESSION_free(ss); 335 return(0); 336 } 337 #ifndef OPENSSL_NO_TLSEXT 338 /* If RFC4507 ticket use empty session ID */ 339 if (s->tlsext_ticket_expected) 340 { 341 ss->session_id_length = 0; 342 goto sess_id_done; 343 } 344 #endif 345 /* Choose which callback will set the session ID */ 346 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 347 if(s->generate_session_id) 348 cb = s->generate_session_id; 349 else if(s->session_ctx->generate_session_id) 350 cb = s->session_ctx->generate_session_id; 351 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 352 /* Choose a session ID */ 353 tmp = ss->session_id_length; 354 if(!cb(s, ss->session_id, &tmp)) 355 { 356 /* The callback failed */ 357 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 358 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 359 SSL_SESSION_free(ss); 360 return(0); 361 } 362 /* Don't allow the callback to set the session length to zero. 363 * nor set it higher than it was. */ 364 if(!tmp || (tmp > ss->session_id_length)) 365 { 366 /* The callback set an illegal length */ 367 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 368 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 369 SSL_SESSION_free(ss); 370 return(0); 371 } 372 /* If the session length was shrunk and we're SSLv2, pad it */ 373 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 374 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 375 else 376 ss->session_id_length = tmp; 377 /* Finally, check for a conflict */ 378 if(SSL_has_matching_session_id(s, ss->session_id, 379 ss->session_id_length)) 380 { 381 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 382 SSL_R_SSL_SESSION_ID_CONFLICT); 383 SSL_SESSION_free(ss); 384 return(0); 385 } 386 #ifndef OPENSSL_NO_TLSEXT 387 sess_id_done: 388 if (s->tlsext_hostname) { 389 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 390 if (ss->tlsext_hostname == NULL) { 391 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 392 SSL_SESSION_free(ss); 393 return 0; 394 } 395 } 396 #ifndef OPENSSL_NO_EC 397 if (s->tlsext_ecpointformatlist) 398 { 399 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 400 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) 401 { 402 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 403 SSL_SESSION_free(ss); 404 return 0; 405 } 406 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 407 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 408 } 409 if (s->tlsext_ellipticcurvelist) 410 { 411 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 412 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 413 { 414 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 415 SSL_SESSION_free(ss); 416 return 0; 417 } 418 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 419 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 420 } 421 #endif 422 #endif 423 } 424 else 425 { 426 ss->session_id_length=0; 427 } 428 429 if (s->sid_ctx_length > sizeof ss->sid_ctx) 430 { 431 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 432 SSL_SESSION_free(ss); 433 return 0; 434 } 435 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 436 ss->sid_ctx_length=s->sid_ctx_length; 437 s->session=ss; 438 ss->ssl_version=s->version; 439 ss->verify_result = X509_V_OK; 440 441 return(1); 442 } 443 444 /* ssl_get_prev attempts to find an SSL_SESSION to be used to resume this 445 * connection. It is only called by servers. 446 * 447 * session_id: points at the session ID in the ClientHello. This code will 448 * read past the end of this in order to parse out the session ticket 449 * extension, if any. 450 * len: the length of the session ID. 451 * limit: a pointer to the first byte after the ClientHello. 452 * 453 * Returns: 454 * -1: error 455 * 0: a session may have been found. 456 * 457 * Side effects: 458 * - If a session is found then s->session is pointed at it (after freeing an 459 * existing session if need be) and s->verify_result is set from the session. 460 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1 461 * if the server should issue a new session ticket (to 0 otherwise). 462 */ 463 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 464 const unsigned char *limit) 465 { 466 /* This is used only by servers. */ 467 468 SSL_SESSION *ret=NULL; 469 int fatal = 0; 470 int try_session_cache = 1; 471 #ifndef OPENSSL_NO_TLSEXT 472 int r; 473 #endif 474 475 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 476 goto err; 477 478 if (len == 0) 479 try_session_cache = 0; 480 481 #ifndef OPENSSL_NO_TLSEXT 482 r = tls1_process_ticket(s, session_id, len, limit, &ret); /* sets s->tlsext_ticket_expected */ 483 switch (r) 484 { 485 case -1: /* Error during processing */ 486 fatal = 1; 487 goto err; 488 case 0: /* No ticket found */ 489 case 1: /* Zero length ticket found */ 490 break; /* Ok to carry on processing session id. */ 491 case 2: /* Ticket found but not decrypted. */ 492 case 3: /* Ticket decrypted, *ret has been set. */ 493 try_session_cache = 0; 494 break; 495 default: 496 abort(); 497 } 498 #endif 499 500 if (try_session_cache && 501 ret == NULL && 502 !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 503 { 504 SSL_SESSION data; 505 data.ssl_version=s->version; 506 data.session_id_length=len; 507 if (len == 0) 508 return 0; 509 memcpy(data.session_id,session_id,len); 510 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 511 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data); 512 if (ret != NULL) 513 { 514 /* don't allow other threads to steal it: */ 515 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 516 } 517 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 518 if (ret == NULL) 519 s->session_ctx->stats.sess_miss++; 520 } 521 522 if (try_session_cache && 523 ret == NULL && 524 s->session_ctx->get_session_cb != NULL) 525 { 526 int copy=1; 527 528 if ((ret=s->session_ctx->get_session_cb(s,session_id,len,©))) 529 { 530 s->session_ctx->stats.sess_cb_hit++; 531 532 /* Increment reference count now if the session callback 533 * asks us to do so (note that if the session structures 534 * returned by the callback are shared between threads, 535 * it must handle the reference count itself [i.e. copy == 0], 536 * or things won't be thread-safe). */ 537 if (copy) 538 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 539 540 /* Add the externally cached session to the internal 541 * cache as well if and only if we are supposed to. */ 542 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 543 /* The following should not return 1, otherwise, 544 * things are very strange */ 545 SSL_CTX_add_session(s->session_ctx,ret); 546 } 547 } 548 549 if (ret == NULL) 550 goto err; 551 552 /* Now ret is non-NULL and we own one of its reference counts. */ 553 554 if (ret->sid_ctx_length != s->sid_ctx_length 555 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 556 { 557 /* We have the session requested by the client, but we don't 558 * want to use it in this context. */ 559 goto err; /* treat like cache miss */ 560 } 561 562 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 563 { 564 /* We can't be sure if this session is being used out of 565 * context, which is especially important for SSL_VERIFY_PEER. 566 * The application should have used SSL[_CTX]_set_session_id_context. 567 * 568 * For this error case, we generate an error instead of treating 569 * the event like a cache miss (otherwise it would be easy for 570 * applications to effectively disable the session cache by 571 * accident without anyone noticing). 572 */ 573 574 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 575 fatal = 1; 576 goto err; 577 } 578 579 if (ret->cipher == NULL) 580 { 581 unsigned char buf[5],*p; 582 unsigned long l; 583 584 p=buf; 585 l=ret->cipher_id; 586 l2n(l,p); 587 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 588 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 589 else 590 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 591 if (ret->cipher == NULL) 592 goto err; 593 } 594 595 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 596 { 597 s->session_ctx->stats.sess_timeout++; 598 if (try_session_cache) 599 { 600 /* session was from the cache, so remove it */ 601 SSL_CTX_remove_session(s->session_ctx,ret); 602 } 603 goto err; 604 } 605 606 s->session_ctx->stats.sess_hit++; 607 608 if (s->session != NULL) 609 SSL_SESSION_free(s->session); 610 s->session=ret; 611 s->verify_result = s->session->verify_result; 612 return 1; 613 614 err: 615 if (ret != NULL) 616 { 617 SSL_SESSION_free(ret); 618 #ifndef OPENSSL_NO_TLSEXT 619 if (!try_session_cache) 620 { 621 /* The session was from a ticket, so we should 622 * issue a ticket for the new session */ 623 s->tlsext_ticket_expected = 1; 624 } 625 #endif 626 } 627 if (fatal) 628 return -1; 629 else 630 return 0; 631 } 632 633 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 634 { 635 int ret=0; 636 SSL_SESSION *s; 637 638 /* add just 1 reference count for the SSL_CTX's session cache 639 * even though it has two ways of access: each session is in a 640 * doubly linked list and an lhash */ 641 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 642 /* if session c is in already in cache, we take back the increment later */ 643 644 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 645 s=lh_SSL_SESSION_insert(ctx->sessions,c); 646 647 /* s != NULL iff we already had a session with the given PID. 648 * In this case, s == c should hold (then we did not really modify 649 * ctx->sessions), or we're in trouble. */ 650 if (s != NULL && s != c) 651 { 652 /* We *are* in trouble ... */ 653 SSL_SESSION_list_remove(ctx,s); 654 SSL_SESSION_free(s); 655 /* ... so pretend the other session did not exist in cache 656 * (we cannot handle two SSL_SESSION structures with identical 657 * session ID in the same cache, which could happen e.g. when 658 * two threads concurrently obtain the same session from an external 659 * cache) */ 660 s = NULL; 661 } 662 663 /* Put at the head of the queue unless it is already in the cache */ 664 if (s == NULL) 665 SSL_SESSION_list_add(ctx,c); 666 667 if (s != NULL) 668 { 669 /* existing cache entry -- decrement previously incremented reference 670 * count because it already takes into account the cache */ 671 672 SSL_SESSION_free(s); /* s == c */ 673 ret=0; 674 } 675 else 676 { 677 /* new cache entry -- remove old ones if cache has become too large */ 678 679 ret=1; 680 681 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 682 { 683 while (SSL_CTX_sess_number(ctx) > 684 SSL_CTX_sess_get_cache_size(ctx)) 685 { 686 if (!remove_session_lock(ctx, 687 ctx->session_cache_tail, 0)) 688 break; 689 else 690 ctx->stats.sess_cache_full++; 691 } 692 } 693 } 694 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 695 return(ret); 696 } 697 698 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 699 { 700 return remove_session_lock(ctx, c, 1); 701 } 702 703 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 704 { 705 SSL_SESSION *r; 706 int ret=0; 707 708 if ((c != NULL) && (c->session_id_length != 0)) 709 { 710 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 711 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 712 { 713 ret=1; 714 r=lh_SSL_SESSION_delete(ctx->sessions,c); 715 SSL_SESSION_list_remove(ctx,c); 716 } 717 718 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 719 720 if (ret) 721 { 722 r->not_resumable=1; 723 if (ctx->remove_session_cb != NULL) 724 ctx->remove_session_cb(ctx,r); 725 SSL_SESSION_free(r); 726 } 727 } 728 else 729 ret=0; 730 return(ret); 731 } 732 733 void SSL_SESSION_free(SSL_SESSION *ss) 734 { 735 int i; 736 737 if(ss == NULL) 738 return; 739 740 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 741 #ifdef REF_PRINT 742 REF_PRINT("SSL_SESSION",ss); 743 #endif 744 if (i > 0) return; 745 #ifdef REF_CHECK 746 if (i < 0) 747 { 748 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 749 abort(); /* ok */ 750 } 751 #endif 752 753 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 754 755 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 756 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 757 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 758 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 759 if (ss->peer != NULL) X509_free(ss->peer); 760 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 761 #ifndef OPENSSL_NO_TLSEXT 762 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 763 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 764 #ifndef OPENSSL_NO_EC 765 ss->tlsext_ecpointformatlist_length = 0; 766 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 767 ss->tlsext_ellipticcurvelist_length = 0; 768 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 769 #endif /* OPENSSL_NO_EC */ 770 #endif 771 #ifndef OPENSSL_NO_PSK 772 if (ss->psk_identity_hint != NULL) 773 OPENSSL_free(ss->psk_identity_hint); 774 if (ss->psk_identity != NULL) 775 OPENSSL_free(ss->psk_identity); 776 #endif 777 #ifndef OPENSSL_NO_SRP 778 if (ss->srp_username != NULL) 779 OPENSSL_free(ss->srp_username); 780 #endif 781 OPENSSL_cleanse(ss,sizeof(*ss)); 782 OPENSSL_free(ss); 783 } 784 785 int SSL_set_session(SSL *s, SSL_SESSION *session) 786 { 787 int ret=0; 788 const SSL_METHOD *meth; 789 790 if (session != NULL) 791 { 792 meth=s->ctx->method->get_ssl_method(session->ssl_version); 793 if (meth == NULL) 794 meth=s->method->get_ssl_method(session->ssl_version); 795 if (meth == NULL) 796 { 797 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 798 return(0); 799 } 800 801 if (meth != s->method) 802 { 803 if (!SSL_set_ssl_method(s,meth)) 804 return(0); 805 } 806 807 #ifndef OPENSSL_NO_KRB5 808 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 809 session->krb5_client_princ_len > 0) 810 { 811 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 812 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 813 session->krb5_client_princ_len); 814 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 815 } 816 #endif /* OPENSSL_NO_KRB5 */ 817 818 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 819 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 820 if (s->session != NULL) 821 SSL_SESSION_free(s->session); 822 s->session=session; 823 s->verify_result = s->session->verify_result; 824 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 825 ret=1; 826 } 827 else 828 { 829 if (s->session != NULL) 830 { 831 SSL_SESSION_free(s->session); 832 s->session=NULL; 833 } 834 835 meth=s->ctx->method; 836 if (meth != s->method) 837 { 838 if (!SSL_set_ssl_method(s,meth)) 839 return(0); 840 } 841 ret=1; 842 } 843 return(ret); 844 } 845 846 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 847 { 848 if (s == NULL) return(0); 849 s->timeout=t; 850 return(1); 851 } 852 853 long SSL_SESSION_get_timeout(const SSL_SESSION *s) 854 { 855 if (s == NULL) return(0); 856 return(s->timeout); 857 } 858 859 long SSL_SESSION_get_time(const SSL_SESSION *s) 860 { 861 if (s == NULL) return(0); 862 return(s->time); 863 } 864 865 long SSL_SESSION_set_time(SSL_SESSION *s, long t) 866 { 867 if (s == NULL) return(0); 868 s->time=t; 869 return(t); 870 } 871 872 X509 *SSL_SESSION_get0_peer(SSL_SESSION *s) 873 { 874 return s->peer; 875 } 876 877 int SSL_SESSION_set1_id_context(SSL_SESSION *s,const unsigned char *sid_ctx, 878 unsigned int sid_ctx_len) 879 { 880 if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) 881 { 882 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); 883 return 0; 884 } 885 s->sid_ctx_length=sid_ctx_len; 886 memcpy(s->sid_ctx,sid_ctx,sid_ctx_len); 887 888 return 1; 889 } 890 891 long SSL_CTX_set_timeout(SSL_CTX *s, long t) 892 { 893 long l; 894 if (s == NULL) return(0); 895 l=s->session_timeout; 896 s->session_timeout=t; 897 return(l); 898 } 899 900 long SSL_CTX_get_timeout(const SSL_CTX *s) 901 { 902 if (s == NULL) return(0); 903 return(s->session_timeout); 904 } 905 906 #ifndef OPENSSL_NO_TLSEXT 907 int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 908 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 909 { 910 if (s == NULL) return(0); 911 s->tls_session_secret_cb = tls_session_secret_cb; 912 s->tls_session_secret_cb_arg = arg; 913 return(1); 914 } 915 916 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 917 void *arg) 918 { 919 if (s == NULL) return(0); 920 s->tls_session_ticket_ext_cb = cb; 921 s->tls_session_ticket_ext_cb_arg = arg; 922 return(1); 923 } 924 925 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 926 { 927 if (s->version >= TLS1_VERSION) 928 { 929 if (s->tlsext_session_ticket) 930 { 931 OPENSSL_free(s->tlsext_session_ticket); 932 s->tlsext_session_ticket = NULL; 933 } 934 935 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 936 if (!s->tlsext_session_ticket) 937 { 938 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 939 return 0; 940 } 941 942 if (ext_data) 943 { 944 s->tlsext_session_ticket->length = ext_len; 945 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 946 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 947 } 948 else 949 { 950 s->tlsext_session_ticket->length = 0; 951 s->tlsext_session_ticket->data = NULL; 952 } 953 954 return 1; 955 } 956 957 return 0; 958 } 959 #endif /* OPENSSL_NO_TLSEXT */ 960 961 typedef struct timeout_param_st 962 { 963 SSL_CTX *ctx; 964 long time; 965 LHASH_OF(SSL_SESSION) *cache; 966 } TIMEOUT_PARAM; 967 968 static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 969 { 970 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 971 { 972 /* The reason we don't call SSL_CTX_remove_session() is to 973 * save on locking overhead */ 974 (void)lh_SSL_SESSION_delete(p->cache,s); 975 SSL_SESSION_list_remove(p->ctx,s); 976 s->not_resumable=1; 977 if (p->ctx->remove_session_cb != NULL) 978 p->ctx->remove_session_cb(p->ctx,s); 979 SSL_SESSION_free(s); 980 } 981 } 982 983 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 984 985 void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 986 { 987 unsigned long i; 988 TIMEOUT_PARAM tp; 989 990 tp.ctx=s; 991 tp.cache=s->sessions; 992 if (tp.cache == NULL) return; 993 tp.time=t; 994 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 995 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 996 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0; 997 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 998 TIMEOUT_PARAM, &tp); 999 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i; 1000 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 1001 } 1002 1003 int ssl_clear_bad_session(SSL *s) 1004 { 1005 if ( (s->session != NULL) && 1006 !(s->shutdown & SSL_SENT_SHUTDOWN) && 1007 !(SSL_in_init(s) || SSL_in_before(s))) 1008 { 1009 SSL_CTX_remove_session(s->ctx,s->session); 1010 return(1); 1011 } 1012 else 1013 return(0); 1014 } 1015 1016 /* locked by SSL_CTX in the calling function */ 1017 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 1018 { 1019 if ((s->next == NULL) || (s->prev == NULL)) return; 1020 1021 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 1022 { /* last element in list */ 1023 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1024 { /* only one element in list */ 1025 ctx->session_cache_head=NULL; 1026 ctx->session_cache_tail=NULL; 1027 } 1028 else 1029 { 1030 ctx->session_cache_tail=s->prev; 1031 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1032 } 1033 } 1034 else 1035 { 1036 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1037 { /* first element in list */ 1038 ctx->session_cache_head=s->next; 1039 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1040 } 1041 else 1042 { /* middle of list */ 1043 s->next->prev=s->prev; 1044 s->prev->next=s->next; 1045 } 1046 } 1047 s->prev=s->next=NULL; 1048 } 1049 1050 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 1051 { 1052 if ((s->next != NULL) && (s->prev != NULL)) 1053 SSL_SESSION_list_remove(ctx,s); 1054 1055 if (ctx->session_cache_head == NULL) 1056 { 1057 ctx->session_cache_head=s; 1058 ctx->session_cache_tail=s; 1059 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1060 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1061 } 1062 else 1063 { 1064 s->next=ctx->session_cache_head; 1065 s->next->prev=s; 1066 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1067 ctx->session_cache_head=s; 1068 } 1069 } 1070 1071 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 1072 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 1073 { 1074 ctx->new_session_cb=cb; 1075 } 1076 1077 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1078 { 1079 return ctx->new_session_cb; 1080 } 1081 1082 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1083 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1084 { 1085 ctx->remove_session_cb=cb; 1086 } 1087 1088 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1089 { 1090 return ctx->remove_session_cb; 1091 } 1092 1093 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1094 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1095 unsigned char *data,int len,int *copy)) 1096 { 1097 ctx->get_session_cb=cb; 1098 } 1099 1100 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1101 unsigned char *data,int len,int *copy) 1102 { 1103 return ctx->get_session_cb; 1104 } 1105 1106 void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1107 void (*cb)(const SSL *ssl,int type,int val)) 1108 { 1109 ctx->info_callback=cb; 1110 } 1111 1112 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1113 { 1114 return ctx->info_callback; 1115 } 1116 1117 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1118 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1119 { 1120 ctx->client_cert_cb=cb; 1121 } 1122 1123 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1124 { 1125 return ctx->client_cert_cb; 1126 } 1127 1128 #ifndef OPENSSL_NO_ENGINE 1129 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1130 { 1131 if (!ENGINE_init(e)) 1132 { 1133 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1134 return 0; 1135 } 1136 if(!ENGINE_get_ssl_client_cert_function(e)) 1137 { 1138 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1139 ENGINE_finish(e); 1140 return 0; 1141 } 1142 ctx->client_cert_engine = e; 1143 return 1; 1144 } 1145 #endif 1146 1147 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1148 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1149 { 1150 ctx->app_gen_cookie_cb=cb; 1151 } 1152 1153 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1154 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1155 { 1156 ctx->app_verify_cookie_cb=cb; 1157 } 1158 1159 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1160