1/* ssl/ssl_sess.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58/* ==================================================================== 59 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111/* ==================================================================== 112 * Copyright 2005 Nokia. All rights reserved. 113 * 114 * The portions of the attached software ("Contribution") is developed by 115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 116 * license. 117 * 118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 120 * support (see RFC 4279) to OpenSSL. 121 * 122 * No patent licenses or other rights except those expressly stated in 123 * the OpenSSL open source license shall be deemed granted or received 124 * expressly, by implication, estoppel, or otherwise. 125 * 126 * No assurances are provided by Nokia that the Contribution does not 127 * infringe the patent or other intellectual property rights of any third 128 * party or that the license provides you with all the necessary rights 129 * to make use of the Contribution. 130 * 131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 135 * OTHERWISE. 136 */ 137 138#include <stdio.h> 139#include <openssl/lhash.h> 140#include <openssl/rand.h> 141#ifndef OPENSSL_NO_ENGINE 142#include <openssl/engine.h> 143#endif 144#include "ssl_locl.h" 145 146static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s); 147static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s); 148static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck); 149 150SSL_SESSION *SSL_get_session(const SSL *ssl) 151/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ 152 { 153 return(ssl->session); 154 } 155 156SSL_SESSION *SSL_get1_session(SSL *ssl) 157/* variant of SSL_get_session: caller really gets something */ 158 { 159 SSL_SESSION *sess; 160 /* Need to lock this all up rather than just use CRYPTO_add so that 161 * somebody doesn't free ssl->session between when we check it's 162 * non-null and when we up the reference count. */ 163 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 164 sess = ssl->session; 165 if(sess) 166 sess->references++; 167 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 168 return(sess); 169 } 170 171int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 172 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 173 { 174 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 175 new_func, dup_func, free_func); 176 } 177 178int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 179 { 180 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg)); 181 } 182 183void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 184 { 185 return(CRYPTO_get_ex_data(&s->ex_data,idx)); 186 } 187 188SSL_SESSION *SSL_SESSION_new(void) 189 { 190 SSL_SESSION *ss; 191 192 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION)); 193 if (ss == NULL) 194 { 195 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE); 196 return(0); 197 } 198 memset(ss,0,sizeof(SSL_SESSION)); 199 200 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 201 ss->references=1; 202 ss->timeout=60*5+4; /* 5 minute timeout by default */ 203 ss->time=(unsigned long)time(NULL); 204 ss->prev=NULL; 205 ss->next=NULL; 206 ss->compress_meth=0; 207#ifndef OPENSSL_NO_TLSEXT 208 ss->tlsext_hostname = NULL; 209#ifndef OPENSSL_NO_EC 210 ss->tlsext_ecpointformatlist_length = 0; 211 ss->tlsext_ecpointformatlist = NULL; 212 ss->tlsext_ellipticcurvelist_length = 0; 213 ss->tlsext_ellipticcurvelist = NULL; 214#endif 215#endif 216 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 217#ifndef OPENSSL_NO_PSK 218 ss->psk_identity_hint=NULL; 219 ss->psk_identity=NULL; 220#endif 221 return(ss); 222 } 223 224const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) 225 { 226 if(len) 227 *len = s->session_id_length; 228 return s->session_id; 229 } 230 231/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 232 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 233 * until we have no conflict is going to complete in one iteration pretty much 234 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 235 * and we still can't avoid a conflict - well that's a reasonable point to call 236 * it quits. Either the RAND code is broken or someone is trying to open roughly 237 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 238 * store that many sessions is perhaps a more interesting question ... */ 239 240#define MAX_SESS_ID_ATTEMPTS 10 241static int def_generate_session_id(const SSL *ssl, unsigned char *id, 242 unsigned int *id_len) 243{ 244 unsigned int retry = 0; 245 do 246 if (RAND_pseudo_bytes(id, *id_len) <= 0) 247 return 0; 248 while(SSL_has_matching_session_id(ssl, id, *id_len) && 249 (++retry < MAX_SESS_ID_ATTEMPTS)); 250 if(retry < MAX_SESS_ID_ATTEMPTS) 251 return 1; 252 /* else - woops a session_id match */ 253 /* XXX We should also check the external cache -- 254 * but the probability of a collision is negligible, and 255 * we could not prevent the concurrent creation of sessions 256 * with identical IDs since we currently don't have means 257 * to atomically check whether a session ID already exists 258 * and make a reservation for it if it does not 259 * (this problem applies to the internal cache as well). 260 */ 261 return 0; 262} 263 264void SSL_set_session_creation_enabled (SSL *s, int creation_enabled) 265 { 266 s->session_creation_enabled = creation_enabled; 267 } 268 269int ssl_get_new_session(SSL *s, int session) 270 { 271 /* This gets used by clients and servers. */ 272 273 unsigned int tmp; 274 SSL_SESSION *ss=NULL; 275 GEN_SESSION_CB cb = def_generate_session_id; 276 277 /* caller should check this if they can do better error handling */ 278 if (!s->session_creation_enabled) return(0); 279 if ((ss=SSL_SESSION_new()) == NULL) return(0); 280 281 /* If the context has a default timeout, use it */ 282 if (s->session_ctx->session_timeout == 0) 283 ss->timeout=SSL_get_default_timeout(s); 284 else 285 ss->timeout=s->session_ctx->session_timeout; 286 287 if (s->session != NULL) 288 { 289 SSL_SESSION_free(s->session); 290 s->session=NULL; 291 } 292 293 if (session) 294 { 295 if (s->version == SSL2_VERSION) 296 { 297 ss->ssl_version=SSL2_VERSION; 298 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 299 } 300 else if (s->version == SSL3_VERSION) 301 { 302 ss->ssl_version=SSL3_VERSION; 303 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 304 } 305 else if (s->version == TLS1_VERSION) 306 { 307 ss->ssl_version=TLS1_VERSION; 308 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 309 } 310 else if (s->version == DTLS1_BAD_VER) 311 { 312 ss->ssl_version=DTLS1_BAD_VER; 313 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 314 } 315 else if (s->version == DTLS1_VERSION) 316 { 317 ss->ssl_version=DTLS1_VERSION; 318 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 319 } 320 else 321 { 322 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 323 SSL_SESSION_free(ss); 324 return(0); 325 } 326#ifndef OPENSSL_NO_TLSEXT 327 /* If RFC4507 ticket use empty session ID */ 328 if (s->tlsext_ticket_expected) 329 { 330 ss->session_id_length = 0; 331 goto sess_id_done; 332 } 333#endif 334 /* Choose which callback will set the session ID */ 335 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 336 if(s->generate_session_id) 337 cb = s->generate_session_id; 338 else if(s->session_ctx->generate_session_id) 339 cb = s->session_ctx->generate_session_id; 340 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 341 /* Choose a session ID */ 342 tmp = ss->session_id_length; 343 if(!cb(s, ss->session_id, &tmp)) 344 { 345 /* The callback failed */ 346 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 347 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 348 SSL_SESSION_free(ss); 349 return(0); 350 } 351 /* Don't allow the callback to set the session length to zero. 352 * nor set it higher than it was. */ 353 if(!tmp || (tmp > ss->session_id_length)) 354 { 355 /* The callback set an illegal length */ 356 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 357 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 358 SSL_SESSION_free(ss); 359 return(0); 360 } 361 /* If the session length was shrunk and we're SSLv2, pad it */ 362 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 363 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 364 else 365 ss->session_id_length = tmp; 366 /* Finally, check for a conflict */ 367 if(SSL_has_matching_session_id(s, ss->session_id, 368 ss->session_id_length)) 369 { 370 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 371 SSL_R_SSL_SESSION_ID_CONFLICT); 372 SSL_SESSION_free(ss); 373 return(0); 374 } 375#ifndef OPENSSL_NO_TLSEXT 376 sess_id_done: 377 if (s->tlsext_hostname) { 378 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 379 if (ss->tlsext_hostname == NULL) { 380 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 381 SSL_SESSION_free(ss); 382 return 0; 383 } 384 } 385#ifndef OPENSSL_NO_EC 386 if (s->tlsext_ecpointformatlist) 387 { 388 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 389 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) 390 { 391 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 392 SSL_SESSION_free(ss); 393 return 0; 394 } 395 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 396 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 397 } 398 if (s->tlsext_ellipticcurvelist) 399 { 400 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 401 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 402 { 403 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 404 SSL_SESSION_free(ss); 405 return 0; 406 } 407 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 408 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 409 } 410#endif 411#endif 412 } 413 else 414 { 415 ss->session_id_length=0; 416 } 417 418 if (s->sid_ctx_length > sizeof ss->sid_ctx) 419 { 420 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 421 SSL_SESSION_free(ss); 422 return 0; 423 } 424 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 425 ss->sid_ctx_length=s->sid_ctx_length; 426 s->session=ss; 427 ss->ssl_version=s->version; 428 ss->verify_result = X509_V_OK; 429 430 return(1); 431 } 432 433int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 434 const unsigned char *limit) 435 { 436 /* This is used only by servers. */ 437 438 SSL_SESSION *ret=NULL; 439 int fatal = 0; 440#ifndef OPENSSL_NO_TLSEXT 441 int r; 442#endif 443 444 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 445 goto err; 446#ifndef OPENSSL_NO_TLSEXT 447 r = tls1_process_ticket(s, session_id, len, limit, &ret); 448 if (r == -1) 449 { 450 fatal = 1; 451 goto err; 452 } 453 else if (r == 0 || (!ret && !len)) 454 goto err; 455 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 456#else 457 if (len == 0) 458 goto err; 459 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 460#endif 461 { 462 SSL_SESSION data; 463 data.ssl_version=s->version; 464 data.session_id_length=len; 465 if (len == 0) 466 return 0; 467 memcpy(data.session_id,session_id,len); 468 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 469 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data); 470 if (ret != NULL) 471 /* don't allow other threads to steal it: */ 472 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 473 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 474 } 475 476 if (ret == NULL) 477 { 478 int copy=1; 479 480 s->session_ctx->stats.sess_miss++; 481 ret=NULL; 482 if (s->session_ctx->get_session_cb != NULL 483 && (ret=s->session_ctx->get_session_cb(s,session_id,len,©)) 484 != NULL) 485 { 486 s->session_ctx->stats.sess_cb_hit++; 487 488 /* Increment reference count now if the session callback 489 * asks us to do so (note that if the session structures 490 * returned by the callback are shared between threads, 491 * it must handle the reference count itself [i.e. copy == 0], 492 * or things won't be thread-safe). */ 493 if (copy) 494 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 495 496 /* Add the externally cached session to the internal 497 * cache as well if and only if we are supposed to. */ 498 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 499 /* The following should not return 1, otherwise, 500 * things are very strange */ 501 SSL_CTX_add_session(s->session_ctx,ret); 502 } 503 if (ret == NULL) 504 goto err; 505 } 506 507 /* Now ret is non-NULL, and we own one of its reference counts. */ 508 509 if (ret->sid_ctx_length != s->sid_ctx_length 510 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 511 { 512 /* We've found the session named by the client, but we don't 513 * want to use it in this context. */ 514 515#if 0 /* The client cannot always know when a session is not appropriate, 516 * so we shouldn't generate an error message. */ 517 518 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 519#endif 520 goto err; /* treat like cache miss */ 521 } 522 523 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 524 { 525 /* We can't be sure if this session is being used out of 526 * context, which is especially important for SSL_VERIFY_PEER. 527 * The application should have used SSL[_CTX]_set_session_id_context. 528 * 529 * For this error case, we generate an error instead of treating 530 * the event like a cache miss (otherwise it would be easy for 531 * applications to effectively disable the session cache by 532 * accident without anyone noticing). 533 */ 534 535 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 536 fatal = 1; 537 goto err; 538 } 539 540 if (ret->cipher == NULL) 541 { 542 unsigned char buf[5],*p; 543 unsigned long l; 544 545 p=buf; 546 l=ret->cipher_id; 547 l2n(l,p); 548 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 549 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 550 else 551 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 552 if (ret->cipher == NULL) 553 goto err; 554 } 555 556 557#if 0 /* This is way too late. */ 558 559 /* If a thread got the session, then 'swaped', and another got 560 * it and then due to a time-out decided to 'OPENSSL_free' it we could 561 * be in trouble. So I'll increment it now, then double decrement 562 * later - am I speaking rubbish?. */ 563 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 564#endif 565 566 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 567 { 568 s->session_ctx->stats.sess_timeout++; 569 /* remove it from the cache */ 570 SSL_CTX_remove_session(s->session_ctx,ret); 571 goto err; 572 } 573 574 s->session_ctx->stats.sess_hit++; 575 576 /* ret->time=time(NULL); */ /* rezero timeout? */ 577 /* again, just leave the session 578 * if it is the same session, we have just incremented and 579 * then decremented the reference count :-) */ 580 if (s->session != NULL) 581 SSL_SESSION_free(s->session); 582 s->session=ret; 583 s->verify_result = s->session->verify_result; 584 return(1); 585 586 err: 587 if (ret != NULL) 588 SSL_SESSION_free(ret); 589 if (fatal) 590 return -1; 591 else 592 return 0; 593 } 594 595int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 596 { 597 int ret=0; 598 SSL_SESSION *s; 599 600 /* add just 1 reference count for the SSL_CTX's session cache 601 * even though it has two ways of access: each session is in a 602 * doubly linked list and an lhash */ 603 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 604 /* if session c is in already in cache, we take back the increment later */ 605 606 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 607 s=lh_SSL_SESSION_insert(ctx->sessions,c); 608 609 /* s != NULL iff we already had a session with the given PID. 610 * In this case, s == c should hold (then we did not really modify 611 * ctx->sessions), or we're in trouble. */ 612 if (s != NULL && s != c) 613 { 614 /* We *are* in trouble ... */ 615 SSL_SESSION_list_remove(ctx,s); 616 SSL_SESSION_free(s); 617 /* ... so pretend the other session did not exist in cache 618 * (we cannot handle two SSL_SESSION structures with identical 619 * session ID in the same cache, which could happen e.g. when 620 * two threads concurrently obtain the same session from an external 621 * cache) */ 622 s = NULL; 623 } 624 625 /* Put at the head of the queue unless it is already in the cache */ 626 if (s == NULL) 627 SSL_SESSION_list_add(ctx,c); 628 629 if (s != NULL) 630 { 631 /* existing cache entry -- decrement previously incremented reference 632 * count because it already takes into account the cache */ 633 634 SSL_SESSION_free(s); /* s == c */ 635 ret=0; 636 } 637 else 638 { 639 /* new cache entry -- remove old ones if cache has become too large */ 640 641 ret=1; 642 643 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 644 { 645 while (SSL_CTX_sess_number(ctx) > 646 SSL_CTX_sess_get_cache_size(ctx)) 647 { 648 if (!remove_session_lock(ctx, 649 ctx->session_cache_tail, 0)) 650 break; 651 else 652 ctx->stats.sess_cache_full++; 653 } 654 } 655 } 656 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 657 return(ret); 658 } 659 660int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 661{ 662 return remove_session_lock(ctx, c, 1); 663} 664 665static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 666 { 667 SSL_SESSION *r; 668 int ret=0; 669 670 if ((c != NULL) && (c->session_id_length != 0)) 671 { 672 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 673 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 674 { 675 ret=1; 676 r=lh_SSL_SESSION_delete(ctx->sessions,c); 677 SSL_SESSION_list_remove(ctx,c); 678 } 679 680 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 681 682 if (ret) 683 { 684 r->not_resumable=1; 685 if (ctx->remove_session_cb != NULL) 686 ctx->remove_session_cb(ctx,r); 687 SSL_SESSION_free(r); 688 } 689 } 690 else 691 ret=0; 692 return(ret); 693 } 694 695void SSL_SESSION_free(SSL_SESSION *ss) 696 { 697 int i; 698 699 if(ss == NULL) 700 return; 701 702 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 703#ifdef REF_PRINT 704 REF_PRINT("SSL_SESSION",ss); 705#endif 706 if (i > 0) return; 707#ifdef REF_CHECK 708 if (i < 0) 709 { 710 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 711 abort(); /* ok */ 712 } 713#endif 714 715 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 716 717 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 718 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 719 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 720 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 721 if (ss->peer != NULL) X509_free(ss->peer); 722 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 723#ifndef OPENSSL_NO_TLSEXT 724 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 725 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 726#ifndef OPENSSL_NO_EC 727 ss->tlsext_ecpointformatlist_length = 0; 728 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 729 ss->tlsext_ellipticcurvelist_length = 0; 730 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 731#endif /* OPENSSL_NO_EC */ 732#endif 733#ifndef OPENSSL_NO_PSK 734 if (ss->psk_identity_hint != NULL) 735 OPENSSL_free(ss->psk_identity_hint); 736 if (ss->psk_identity != NULL) 737 OPENSSL_free(ss->psk_identity); 738#endif 739 OPENSSL_cleanse(ss,sizeof(*ss)); 740 OPENSSL_free(ss); 741 } 742 743int SSL_set_session(SSL *s, SSL_SESSION *session) 744 { 745 int ret=0; 746 const SSL_METHOD *meth; 747 748 if (session != NULL) 749 { 750 meth=s->ctx->method->get_ssl_method(session->ssl_version); 751 if (meth == NULL) 752 meth=s->method->get_ssl_method(session->ssl_version); 753 if (meth == NULL) 754 { 755 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 756 return(0); 757 } 758 759 if (meth != s->method) 760 { 761 if (!SSL_set_ssl_method(s,meth)) 762 return(0); 763 if (s->ctx->session_timeout == 0) 764 session->timeout=SSL_get_default_timeout(s); 765 else 766 session->timeout=s->ctx->session_timeout; 767 } 768 769#ifndef OPENSSL_NO_KRB5 770 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 771 session->krb5_client_princ_len > 0) 772 { 773 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 774 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 775 session->krb5_client_princ_len); 776 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 777 } 778#endif /* OPENSSL_NO_KRB5 */ 779 780 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 781 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 782 if (s->session != NULL) 783 SSL_SESSION_free(s->session); 784 s->session=session; 785 s->verify_result = s->session->verify_result; 786 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 787 ret=1; 788 } 789 else 790 { 791 if (s->session != NULL) 792 { 793 SSL_SESSION_free(s->session); 794 s->session=NULL; 795 } 796 797 meth=s->ctx->method; 798 if (meth != s->method) 799 { 800 if (!SSL_set_ssl_method(s,meth)) 801 return(0); 802 } 803 ret=1; 804 } 805 return(ret); 806 } 807 808long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 809 { 810 if (s == NULL) return(0); 811 s->timeout=t; 812 return(1); 813 } 814 815long SSL_SESSION_get_timeout(const SSL_SESSION *s) 816 { 817 if (s == NULL) return(0); 818 return(s->timeout); 819 } 820 821long SSL_SESSION_get_time(const SSL_SESSION *s) 822 { 823 if (s == NULL) return(0); 824 return(s->time); 825 } 826 827long SSL_SESSION_set_time(SSL_SESSION *s, long t) 828 { 829 if (s == NULL) return(0); 830 s->time=t; 831 return(t); 832 } 833 834long SSL_CTX_set_timeout(SSL_CTX *s, long t) 835 { 836 long l; 837 if (s == NULL) return(0); 838 l=s->session_timeout; 839 s->session_timeout=t; 840 return(l); 841 } 842 843long SSL_CTX_get_timeout(const SSL_CTX *s) 844 { 845 if (s == NULL) return(0); 846 return(s->session_timeout); 847 } 848 849#ifndef OPENSSL_NO_TLSEXT 850int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 851 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 852 { 853 if (s == NULL) return(0); 854 s->tls_session_secret_cb = tls_session_secret_cb; 855 s->tls_session_secret_cb_arg = arg; 856 return(1); 857 } 858 859int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 860 void *arg) 861 { 862 if (s == NULL) return(0); 863 s->tls_session_ticket_ext_cb = cb; 864 s->tls_session_ticket_ext_cb_arg = arg; 865 return(1); 866 } 867 868int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 869 { 870 if (s->version >= TLS1_VERSION) 871 { 872 if (s->tlsext_session_ticket) 873 { 874 OPENSSL_free(s->tlsext_session_ticket); 875 s->tlsext_session_ticket = NULL; 876 } 877 878 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 879 if (!s->tlsext_session_ticket) 880 { 881 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 882 return 0; 883 } 884 885 if (ext_data) 886 { 887 s->tlsext_session_ticket->length = ext_len; 888 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 889 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 890 } 891 else 892 { 893 s->tlsext_session_ticket->length = 0; 894 s->tlsext_session_ticket->data = NULL; 895 } 896 897 return 1; 898 } 899 900 return 0; 901 } 902#endif /* OPENSSL_NO_TLSEXT */ 903 904typedef struct timeout_param_st 905 { 906 SSL_CTX *ctx; 907 long time; 908 LHASH_OF(SSL_SESSION) *cache; 909 } TIMEOUT_PARAM; 910 911static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 912 { 913 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 914 { 915 /* The reason we don't call SSL_CTX_remove_session() is to 916 * save on locking overhead */ 917 (void)lh_SSL_SESSION_delete(p->cache,s); 918 SSL_SESSION_list_remove(p->ctx,s); 919 s->not_resumable=1; 920 if (p->ctx->remove_session_cb != NULL) 921 p->ctx->remove_session_cb(p->ctx,s); 922 SSL_SESSION_free(s); 923 } 924 } 925 926static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 927 928void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 929 { 930 unsigned long i; 931 TIMEOUT_PARAM tp; 932 933 tp.ctx=s; 934 tp.cache=s->sessions; 935 if (tp.cache == NULL) return; 936 tp.time=t; 937 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 938 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 939 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0; 940 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 941 TIMEOUT_PARAM, &tp); 942 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i; 943 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 944 } 945 946int ssl_clear_bad_session(SSL *s) 947 { 948 if ( (s->session != NULL) && 949 !(s->shutdown & SSL_SENT_SHUTDOWN) && 950 !(SSL_in_init(s) || SSL_in_before(s))) 951 { 952 SSL_CTX_remove_session(s->ctx,s->session); 953 return(1); 954 } 955 else 956 return(0); 957 } 958 959/* locked by SSL_CTX in the calling function */ 960static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 961 { 962 if ((s->next == NULL) || (s->prev == NULL)) return; 963 964 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 965 { /* last element in list */ 966 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 967 { /* only one element in list */ 968 ctx->session_cache_head=NULL; 969 ctx->session_cache_tail=NULL; 970 } 971 else 972 { 973 ctx->session_cache_tail=s->prev; 974 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 975 } 976 } 977 else 978 { 979 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 980 { /* first element in list */ 981 ctx->session_cache_head=s->next; 982 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 983 } 984 else 985 { /* middle of list */ 986 s->next->prev=s->prev; 987 s->prev->next=s->next; 988 } 989 } 990 s->prev=s->next=NULL; 991 } 992 993static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 994 { 995 if ((s->next != NULL) && (s->prev != NULL)) 996 SSL_SESSION_list_remove(ctx,s); 997 998 if (ctx->session_cache_head == NULL) 999 { 1000 ctx->session_cache_head=s; 1001 ctx->session_cache_tail=s; 1002 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1003 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1004 } 1005 else 1006 { 1007 s->next=ctx->session_cache_head; 1008 s->next->prev=s; 1009 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1010 ctx->session_cache_head=s; 1011 } 1012 } 1013 1014void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 1015 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 1016 { 1017 ctx->new_session_cb=cb; 1018 } 1019 1020int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1021 { 1022 return ctx->new_session_cb; 1023 } 1024 1025void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1026 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1027 { 1028 ctx->remove_session_cb=cb; 1029 } 1030 1031void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1032 { 1033 return ctx->remove_session_cb; 1034 } 1035 1036void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1037 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1038 unsigned char *data,int len,int *copy)) 1039 { 1040 ctx->get_session_cb=cb; 1041 } 1042 1043SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1044 unsigned char *data,int len,int *copy) 1045 { 1046 return ctx->get_session_cb; 1047 } 1048 1049void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1050 void (*cb)(const SSL *ssl,int type,int val)) 1051 { 1052 ctx->info_callback=cb; 1053 } 1054 1055void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1056 { 1057 return ctx->info_callback; 1058 } 1059 1060void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1061 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1062 { 1063 ctx->client_cert_cb=cb; 1064 } 1065 1066int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1067 { 1068 return ctx->client_cert_cb; 1069 } 1070 1071#ifndef OPENSSL_NO_ENGINE 1072int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1073 { 1074 if (!ENGINE_init(e)) 1075 { 1076 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1077 return 0; 1078 } 1079 if(!ENGINE_get_ssl_client_cert_function(e)) 1080 { 1081 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1082 ENGINE_finish(e); 1083 return 0; 1084 } 1085 ctx->client_cert_engine = e; 1086 return 1; 1087 } 1088#endif 1089 1090void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1091 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1092 { 1093 ctx->app_gen_cookie_cb=cb; 1094 } 1095 1096void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1097 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1098 { 1099 ctx->app_verify_cookie_cb=cb; 1100 } 1101 1102IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1103