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 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 235 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 236 * until we have no conflict is going to complete in one iteration pretty much 237 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 238 * and we still can't avoid a conflict - well that's a reasonable point to call 239 * it quits. Either the RAND code is broken or someone is trying to open roughly 240 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 241 * store that many sessions is perhaps a more interesting question ... */ 242 243 #define MAX_SESS_ID_ATTEMPTS 10 244 static int def_generate_session_id(const SSL *ssl, unsigned char *id, 245 unsigned int *id_len) 246 { 247 unsigned int retry = 0; 248 do 249 if (RAND_pseudo_bytes(id, *id_len) <= 0) 250 return 0; 251 while(SSL_has_matching_session_id(ssl, id, *id_len) && 252 (++retry < MAX_SESS_ID_ATTEMPTS)); 253 if(retry < MAX_SESS_ID_ATTEMPTS) 254 return 1; 255 /* else - woops a session_id match */ 256 /* XXX We should also check the external cache -- 257 * but the probability of a collision is negligible, and 258 * we could not prevent the concurrent creation of sessions 259 * with identical IDs since we currently don't have means 260 * to atomically check whether a session ID already exists 261 * and make a reservation for it if it does not 262 * (this problem applies to the internal cache as well). 263 */ 264 return 0; 265 } 266 267 int ssl_get_new_session(SSL *s, int session) 268 { 269 /* This gets used by clients and servers. */ 270 271 unsigned int tmp; 272 SSL_SESSION *ss=NULL; 273 GEN_SESSION_CB cb = def_generate_session_id; 274 275 if ((ss=SSL_SESSION_new()) == NULL) return(0); 276 277 /* If the context has a default timeout, use it */ 278 if (s->session_ctx->session_timeout == 0) 279 ss->timeout=SSL_get_default_timeout(s); 280 else 281 ss->timeout=s->session_ctx->session_timeout; 282 283 if (s->session != NULL) 284 { 285 SSL_SESSION_free(s->session); 286 s->session=NULL; 287 } 288 289 if (session) 290 { 291 if (s->version == SSL2_VERSION) 292 { 293 ss->ssl_version=SSL2_VERSION; 294 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 295 } 296 else if (s->version == SSL3_VERSION) 297 { 298 ss->ssl_version=SSL3_VERSION; 299 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 300 } 301 else if (s->version == TLS1_VERSION) 302 { 303 ss->ssl_version=TLS1_VERSION; 304 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 305 } 306 else if (s->version == TLS1_1_VERSION) 307 { 308 ss->ssl_version=TLS1_1_VERSION; 309 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 310 } 311 else if (s->version == TLS1_2_VERSION) 312 { 313 ss->ssl_version=TLS1_2_VERSION; 314 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 315 } 316 else if (s->version == DTLS1_BAD_VER) 317 { 318 ss->ssl_version=DTLS1_BAD_VER; 319 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 320 } 321 else if (s->version == DTLS1_VERSION) 322 { 323 ss->ssl_version=DTLS1_VERSION; 324 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 325 } 326 else 327 { 328 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 329 SSL_SESSION_free(ss); 330 return(0); 331 } 332 #ifndef OPENSSL_NO_TLSEXT 333 /* If RFC4507 ticket use empty session ID */ 334 if (s->tlsext_ticket_expected) 335 { 336 ss->session_id_length = 0; 337 goto sess_id_done; 338 } 339 #endif 340 /* Choose which callback will set the session ID */ 341 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 342 if(s->generate_session_id) 343 cb = s->generate_session_id; 344 else if(s->session_ctx->generate_session_id) 345 cb = s->session_ctx->generate_session_id; 346 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 347 /* Choose a session ID */ 348 tmp = ss->session_id_length; 349 if(!cb(s, ss->session_id, &tmp)) 350 { 351 /* The callback failed */ 352 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 353 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 354 SSL_SESSION_free(ss); 355 return(0); 356 } 357 /* Don't allow the callback to set the session length to zero. 358 * nor set it higher than it was. */ 359 if(!tmp || (tmp > ss->session_id_length)) 360 { 361 /* The callback set an illegal length */ 362 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 363 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 364 SSL_SESSION_free(ss); 365 return(0); 366 } 367 /* If the session length was shrunk and we're SSLv2, pad it */ 368 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 369 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 370 else 371 ss->session_id_length = tmp; 372 /* Finally, check for a conflict */ 373 if(SSL_has_matching_session_id(s, ss->session_id, 374 ss->session_id_length)) 375 { 376 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 377 SSL_R_SSL_SESSION_ID_CONFLICT); 378 SSL_SESSION_free(ss); 379 return(0); 380 } 381 #ifndef OPENSSL_NO_TLSEXT 382 sess_id_done: 383 if (s->tlsext_hostname) { 384 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 385 if (ss->tlsext_hostname == NULL) { 386 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 387 SSL_SESSION_free(ss); 388 return 0; 389 } 390 } 391 #ifndef OPENSSL_NO_EC 392 if (s->tlsext_ecpointformatlist) 393 { 394 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 395 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) 396 { 397 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 398 SSL_SESSION_free(ss); 399 return 0; 400 } 401 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 402 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 403 } 404 if (s->tlsext_ellipticcurvelist) 405 { 406 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 407 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_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_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 414 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 415 } 416 #endif 417 #endif 418 } 419 else 420 { 421 ss->session_id_length=0; 422 } 423 424 if (s->sid_ctx_length > sizeof ss->sid_ctx) 425 { 426 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 427 SSL_SESSION_free(ss); 428 return 0; 429 } 430 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 431 ss->sid_ctx_length=s->sid_ctx_length; 432 s->session=ss; 433 ss->ssl_version=s->version; 434 ss->verify_result = X509_V_OK; 435 436 return(1); 437 } 438 439 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 440 const unsigned char *limit) 441 { 442 /* This is used only by servers. */ 443 444 SSL_SESSION *ret=NULL; 445 int fatal = 0; 446 #ifndef OPENSSL_NO_TLSEXT 447 int r; 448 #endif 449 450 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 451 goto err; 452 #ifndef OPENSSL_NO_TLSEXT 453 r = tls1_process_ticket(s, session_id, len, limit, &ret); 454 if (r == -1) 455 { 456 fatal = 1; 457 goto err; 458 } 459 else if (r == 0 || (!ret && !len)) 460 goto err; 461 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 462 #else 463 if (len == 0) 464 goto err; 465 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 466 #endif 467 { 468 SSL_SESSION data; 469 data.ssl_version=s->version; 470 data.session_id_length=len; 471 if (len == 0) 472 return 0; 473 memcpy(data.session_id,session_id,len); 474 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 475 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data); 476 if (ret != NULL) 477 /* don't allow other threads to steal it: */ 478 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 479 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 480 } 481 482 if (ret == NULL) 483 { 484 int copy=1; 485 486 s->session_ctx->stats.sess_miss++; 487 ret=NULL; 488 if (s->session_ctx->get_session_cb != NULL 489 && (ret=s->session_ctx->get_session_cb(s,session_id,len,©)) 490 != NULL) 491 { 492 s->session_ctx->stats.sess_cb_hit++; 493 494 /* Increment reference count now if the session callback 495 * asks us to do so (note that if the session structures 496 * returned by the callback are shared between threads, 497 * it must handle the reference count itself [i.e. copy == 0], 498 * or things won't be thread-safe). */ 499 if (copy) 500 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 501 502 /* Add the externally cached session to the internal 503 * cache as well if and only if we are supposed to. */ 504 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 505 /* The following should not return 1, otherwise, 506 * things are very strange */ 507 SSL_CTX_add_session(s->session_ctx,ret); 508 } 509 if (ret == NULL) 510 goto err; 511 } 512 513 /* Now ret is non-NULL, and we own one of its reference counts. */ 514 515 if (ret->sid_ctx_length != s->sid_ctx_length 516 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 517 { 518 /* We've found the session named by the client, but we don't 519 * want to use it in this context. */ 520 521 #if 0 /* The client cannot always know when a session is not appropriate, 522 * so we shouldn't generate an error message. */ 523 524 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 525 #endif 526 goto err; /* treat like cache miss */ 527 } 528 529 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 530 { 531 /* We can't be sure if this session is being used out of 532 * context, which is especially important for SSL_VERIFY_PEER. 533 * The application should have used SSL[_CTX]_set_session_id_context. 534 * 535 * For this error case, we generate an error instead of treating 536 * the event like a cache miss (otherwise it would be easy for 537 * applications to effectively disable the session cache by 538 * accident without anyone noticing). 539 */ 540 541 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 542 fatal = 1; 543 goto err; 544 } 545 546 if (ret->cipher == NULL) 547 { 548 unsigned char buf[5],*p; 549 unsigned long l; 550 551 p=buf; 552 l=ret->cipher_id; 553 l2n(l,p); 554 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 555 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 556 else 557 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 558 if (ret->cipher == NULL) 559 goto err; 560 } 561 562 563 #if 0 /* This is way too late. */ 564 565 /* If a thread got the session, then 'swaped', and another got 566 * it and then due to a time-out decided to 'OPENSSL_free' it we could 567 * be in trouble. So I'll increment it now, then double decrement 568 * later - am I speaking rubbish?. */ 569 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 570 #endif 571 572 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 573 { 574 s->session_ctx->stats.sess_timeout++; 575 /* remove it from the cache */ 576 SSL_CTX_remove_session(s->session_ctx,ret); 577 goto err; 578 } 579 580 s->session_ctx->stats.sess_hit++; 581 582 /* ret->time=time(NULL); */ /* rezero timeout? */ 583 /* again, just leave the session 584 * if it is the same session, we have just incremented and 585 * then decremented the reference count :-) */ 586 if (s->session != NULL) 587 SSL_SESSION_free(s->session); 588 s->session=ret; 589 s->verify_result = s->session->verify_result; 590 return(1); 591 592 err: 593 if (ret != NULL) 594 SSL_SESSION_free(ret); 595 if (fatal) 596 return -1; 597 else 598 return 0; 599 } 600 601 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 602 { 603 int ret=0; 604 SSL_SESSION *s; 605 606 /* add just 1 reference count for the SSL_CTX's session cache 607 * even though it has two ways of access: each session is in a 608 * doubly linked list and an lhash */ 609 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 610 /* if session c is in already in cache, we take back the increment later */ 611 612 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 613 s=lh_SSL_SESSION_insert(ctx->sessions,c); 614 615 /* s != NULL iff we already had a session with the given PID. 616 * In this case, s == c should hold (then we did not really modify 617 * ctx->sessions), or we're in trouble. */ 618 if (s != NULL && s != c) 619 { 620 /* We *are* in trouble ... */ 621 SSL_SESSION_list_remove(ctx,s); 622 SSL_SESSION_free(s); 623 /* ... so pretend the other session did not exist in cache 624 * (we cannot handle two SSL_SESSION structures with identical 625 * session ID in the same cache, which could happen e.g. when 626 * two threads concurrently obtain the same session from an external 627 * cache) */ 628 s = NULL; 629 } 630 631 /* Put at the head of the queue unless it is already in the cache */ 632 if (s == NULL) 633 SSL_SESSION_list_add(ctx,c); 634 635 if (s != NULL) 636 { 637 /* existing cache entry -- decrement previously incremented reference 638 * count because it already takes into account the cache */ 639 640 SSL_SESSION_free(s); /* s == c */ 641 ret=0; 642 } 643 else 644 { 645 /* new cache entry -- remove old ones if cache has become too large */ 646 647 ret=1; 648 649 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 650 { 651 while (SSL_CTX_sess_number(ctx) > 652 SSL_CTX_sess_get_cache_size(ctx)) 653 { 654 if (!remove_session_lock(ctx, 655 ctx->session_cache_tail, 0)) 656 break; 657 else 658 ctx->stats.sess_cache_full++; 659 } 660 } 661 } 662 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 663 return(ret); 664 } 665 666 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 667 { 668 return remove_session_lock(ctx, c, 1); 669 } 670 671 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 672 { 673 SSL_SESSION *r; 674 int ret=0; 675 676 if ((c != NULL) && (c->session_id_length != 0)) 677 { 678 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 679 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 680 { 681 ret=1; 682 r=lh_SSL_SESSION_delete(ctx->sessions,c); 683 SSL_SESSION_list_remove(ctx,c); 684 } 685 686 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 687 688 if (ret) 689 { 690 r->not_resumable=1; 691 if (ctx->remove_session_cb != NULL) 692 ctx->remove_session_cb(ctx,r); 693 SSL_SESSION_free(r); 694 } 695 } 696 else 697 ret=0; 698 return(ret); 699 } 700 701 void SSL_SESSION_free(SSL_SESSION *ss) 702 { 703 int i; 704 705 if(ss == NULL) 706 return; 707 708 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 709 #ifdef REF_PRINT 710 REF_PRINT("SSL_SESSION",ss); 711 #endif 712 if (i > 0) return; 713 #ifdef REF_CHECK 714 if (i < 0) 715 { 716 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 717 abort(); /* ok */ 718 } 719 #endif 720 721 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 722 723 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 724 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 725 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 726 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 727 if (ss->peer != NULL) X509_free(ss->peer); 728 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 729 #ifndef OPENSSL_NO_TLSEXT 730 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 731 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 732 #ifndef OPENSSL_NO_EC 733 ss->tlsext_ecpointformatlist_length = 0; 734 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 735 ss->tlsext_ellipticcurvelist_length = 0; 736 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 737 #endif /* OPENSSL_NO_EC */ 738 #endif 739 #ifndef OPENSSL_NO_PSK 740 if (ss->psk_identity_hint != NULL) 741 OPENSSL_free(ss->psk_identity_hint); 742 if (ss->psk_identity != NULL) 743 OPENSSL_free(ss->psk_identity); 744 #endif 745 #ifndef OPENSSL_NO_SRP 746 if (ss->srp_username != NULL) 747 OPENSSL_free(ss->srp_username); 748 #endif 749 OPENSSL_cleanse(ss,sizeof(*ss)); 750 OPENSSL_free(ss); 751 } 752 753 int SSL_set_session(SSL *s, SSL_SESSION *session) 754 { 755 int ret=0; 756 const SSL_METHOD *meth; 757 758 if (session != NULL) 759 { 760 meth=s->ctx->method->get_ssl_method(session->ssl_version); 761 if (meth == NULL) 762 meth=s->method->get_ssl_method(session->ssl_version); 763 if (meth == NULL) 764 { 765 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 766 return(0); 767 } 768 769 if (meth != s->method) 770 { 771 if (!SSL_set_ssl_method(s,meth)) 772 return(0); 773 if (s->ctx->session_timeout == 0) 774 session->timeout=SSL_get_default_timeout(s); 775 else 776 session->timeout=s->ctx->session_timeout; 777 } 778 779 #ifndef OPENSSL_NO_KRB5 780 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 781 session->krb5_client_princ_len > 0) 782 { 783 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 784 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 785 session->krb5_client_princ_len); 786 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 787 } 788 #endif /* OPENSSL_NO_KRB5 */ 789 790 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 791 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 792 if (s->session != NULL) 793 SSL_SESSION_free(s->session); 794 s->session=session; 795 s->verify_result = s->session->verify_result; 796 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 797 ret=1; 798 } 799 else 800 { 801 if (s->session != NULL) 802 { 803 SSL_SESSION_free(s->session); 804 s->session=NULL; 805 } 806 807 meth=s->ctx->method; 808 if (meth != s->method) 809 { 810 if (!SSL_set_ssl_method(s,meth)) 811 return(0); 812 } 813 ret=1; 814 } 815 return(ret); 816 } 817 818 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 819 { 820 if (s == NULL) return(0); 821 s->timeout=t; 822 return(1); 823 } 824 825 long SSL_SESSION_get_timeout(const SSL_SESSION *s) 826 { 827 if (s == NULL) return(0); 828 return(s->timeout); 829 } 830 831 long SSL_SESSION_get_time(const SSL_SESSION *s) 832 { 833 if (s == NULL) return(0); 834 return(s->time); 835 } 836 837 long SSL_SESSION_set_time(SSL_SESSION *s, long t) 838 { 839 if (s == NULL) return(0); 840 s->time=t; 841 return(t); 842 } 843 844 unsigned int SSL_SESSION_get_id_len(SSL_SESSION *s) 845 { 846 return s->session_id_length; 847 } 848 849 const unsigned char *SSL_SESSION_get0_id(SSL_SESSION *s) 850 { 851 return s->session_id; 852 } 853 854 X509 *SSL_SESSION_get0_peer(SSL_SESSION *s) 855 { 856 return s->peer; 857 } 858 859 int SSL_SESSION_set1_id_context(SSL_SESSION *s,const unsigned char *sid_ctx, 860 unsigned int sid_ctx_len) 861 { 862 if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) 863 { 864 SSLerr(SSL_F_SSL_SESSION_SET1_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); 865 return 0; 866 } 867 s->sid_ctx_length=sid_ctx_len; 868 memcpy(s->sid_ctx,sid_ctx,sid_ctx_len); 869 870 return 1; 871 } 872 873 long SSL_CTX_set_timeout(SSL_CTX *s, long t) 874 { 875 long l; 876 if (s == NULL) return(0); 877 l=s->session_timeout; 878 s->session_timeout=t; 879 return(l); 880 } 881 882 long SSL_CTX_get_timeout(const SSL_CTX *s) 883 { 884 if (s == NULL) return(0); 885 return(s->session_timeout); 886 } 887 888 #ifndef OPENSSL_NO_TLSEXT 889 int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 890 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 891 { 892 if (s == NULL) return(0); 893 s->tls_session_secret_cb = tls_session_secret_cb; 894 s->tls_session_secret_cb_arg = arg; 895 return(1); 896 } 897 898 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 899 void *arg) 900 { 901 if (s == NULL) return(0); 902 s->tls_session_ticket_ext_cb = cb; 903 s->tls_session_ticket_ext_cb_arg = arg; 904 return(1); 905 } 906 907 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 908 { 909 if (s->version >= TLS1_VERSION) 910 { 911 if (s->tlsext_session_ticket) 912 { 913 OPENSSL_free(s->tlsext_session_ticket); 914 s->tlsext_session_ticket = NULL; 915 } 916 917 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 918 if (!s->tlsext_session_ticket) 919 { 920 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 921 return 0; 922 } 923 924 if (ext_data) 925 { 926 s->tlsext_session_ticket->length = ext_len; 927 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 928 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 929 } 930 else 931 { 932 s->tlsext_session_ticket->length = 0; 933 s->tlsext_session_ticket->data = NULL; 934 } 935 936 return 1; 937 } 938 939 return 0; 940 } 941 #endif /* OPENSSL_NO_TLSEXT */ 942 943 typedef struct timeout_param_st 944 { 945 SSL_CTX *ctx; 946 long time; 947 LHASH_OF(SSL_SESSION) *cache; 948 } TIMEOUT_PARAM; 949 950 static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 951 { 952 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 953 { 954 /* The reason we don't call SSL_CTX_remove_session() is to 955 * save on locking overhead */ 956 (void)lh_SSL_SESSION_delete(p->cache,s); 957 SSL_SESSION_list_remove(p->ctx,s); 958 s->not_resumable=1; 959 if (p->ctx->remove_session_cb != NULL) 960 p->ctx->remove_session_cb(p->ctx,s); 961 SSL_SESSION_free(s); 962 } 963 } 964 965 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 966 967 void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 968 { 969 unsigned long i; 970 TIMEOUT_PARAM tp; 971 972 tp.ctx=s; 973 tp.cache=s->sessions; 974 if (tp.cache == NULL) return; 975 tp.time=t; 976 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 977 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 978 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0; 979 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 980 TIMEOUT_PARAM, &tp); 981 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i; 982 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 983 } 984 985 int ssl_clear_bad_session(SSL *s) 986 { 987 if ( (s->session != NULL) && 988 !(s->shutdown & SSL_SENT_SHUTDOWN) && 989 !(SSL_in_init(s) || SSL_in_before(s))) 990 { 991 SSL_CTX_remove_session(s->ctx,s->session); 992 return(1); 993 } 994 else 995 return(0); 996 } 997 998 /* locked by SSL_CTX in the calling function */ 999 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 1000 { 1001 if ((s->next == NULL) || (s->prev == NULL)) return; 1002 1003 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 1004 { /* last element in list */ 1005 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1006 { /* only one element in list */ 1007 ctx->session_cache_head=NULL; 1008 ctx->session_cache_tail=NULL; 1009 } 1010 else 1011 { 1012 ctx->session_cache_tail=s->prev; 1013 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1014 } 1015 } 1016 else 1017 { 1018 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 1019 { /* first element in list */ 1020 ctx->session_cache_head=s->next; 1021 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1022 } 1023 else 1024 { /* middle of list */ 1025 s->next->prev=s->prev; 1026 s->prev->next=s->next; 1027 } 1028 } 1029 s->prev=s->next=NULL; 1030 } 1031 1032 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 1033 { 1034 if ((s->next != NULL) && (s->prev != NULL)) 1035 SSL_SESSION_list_remove(ctx,s); 1036 1037 if (ctx->session_cache_head == NULL) 1038 { 1039 ctx->session_cache_head=s; 1040 ctx->session_cache_tail=s; 1041 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1042 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 1043 } 1044 else 1045 { 1046 s->next=ctx->session_cache_head; 1047 s->next->prev=s; 1048 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1049 ctx->session_cache_head=s; 1050 } 1051 } 1052 1053 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 1054 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 1055 { 1056 ctx->new_session_cb=cb; 1057 } 1058 1059 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1060 { 1061 return ctx->new_session_cb; 1062 } 1063 1064 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1065 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1066 { 1067 ctx->remove_session_cb=cb; 1068 } 1069 1070 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1071 { 1072 return ctx->remove_session_cb; 1073 } 1074 1075 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1076 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1077 unsigned char *data,int len,int *copy)) 1078 { 1079 ctx->get_session_cb=cb; 1080 } 1081 1082 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1083 unsigned char *data,int len,int *copy) 1084 { 1085 return ctx->get_session_cb; 1086 } 1087 1088 void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1089 void (*cb)(const SSL *ssl,int type,int val)) 1090 { 1091 ctx->info_callback=cb; 1092 } 1093 1094 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1095 { 1096 return ctx->info_callback; 1097 } 1098 1099 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1100 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1101 { 1102 ctx->client_cert_cb=cb; 1103 } 1104 1105 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1106 { 1107 return ctx->client_cert_cb; 1108 } 1109 1110 #ifndef OPENSSL_NO_ENGINE 1111 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1112 { 1113 if (!ENGINE_init(e)) 1114 { 1115 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1116 return 0; 1117 } 1118 if(!ENGINE_get_ssl_client_cert_function(e)) 1119 { 1120 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1121 ENGINE_finish(e); 1122 return 0; 1123 } 1124 ctx->client_cert_engine = e; 1125 return 1; 1126 } 1127 #endif 1128 1129 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1130 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1131 { 1132 ctx->app_gen_cookie_cb=cb; 1133 } 1134 1135 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1136 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1137 { 1138 ctx->app_verify_cookie_cb=cb; 1139 } 1140 1141 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1142