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 return(ss); 222 } 223 224 const 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 10 241 static 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 } 263 264 int ssl_get_new_session(SSL *s, int session) 265 { 266 /* This gets used by clients and servers. */ 267 268 unsigned int tmp; 269 SSL_SESSION *ss=NULL; 270 GEN_SESSION_CB cb = def_generate_session_id; 271 272 if ((ss=SSL_SESSION_new()) == NULL) return(0); 273 274 /* If the context has a default timeout, use it */ 275 if (s->session_ctx->session_timeout == 0) 276 ss->timeout=SSL_get_default_timeout(s); 277 else 278 ss->timeout=s->session_ctx->session_timeout; 279 280 if (s->session != NULL) 281 { 282 SSL_SESSION_free(s->session); 283 s->session=NULL; 284 } 285 286 if (session) 287 { 288 if (s->version == SSL2_VERSION) 289 { 290 ss->ssl_version=SSL2_VERSION; 291 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 292 } 293 else if (s->version == SSL3_VERSION) 294 { 295 ss->ssl_version=SSL3_VERSION; 296 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 297 } 298 else if (s->version == TLS1_VERSION) 299 { 300 ss->ssl_version=TLS1_VERSION; 301 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 302 } 303 else if (s->version == DTLS1_BAD_VER) 304 { 305 ss->ssl_version=DTLS1_BAD_VER; 306 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 307 } 308 else if (s->version == DTLS1_VERSION) 309 { 310 ss->ssl_version=DTLS1_VERSION; 311 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 312 } 313 else 314 { 315 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 316 SSL_SESSION_free(ss); 317 return(0); 318 } 319 #ifndef OPENSSL_NO_TLSEXT 320 /* If RFC4507 ticket use empty session ID */ 321 if (s->tlsext_ticket_expected) 322 { 323 ss->session_id_length = 0; 324 goto sess_id_done; 325 } 326 #endif 327 /* Choose which callback will set the session ID */ 328 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 329 if(s->generate_session_id) 330 cb = s->generate_session_id; 331 else if(s->session_ctx->generate_session_id) 332 cb = s->session_ctx->generate_session_id; 333 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 334 /* Choose a session ID */ 335 tmp = ss->session_id_length; 336 if(!cb(s, ss->session_id, &tmp)) 337 { 338 /* The callback failed */ 339 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 340 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 341 SSL_SESSION_free(ss); 342 return(0); 343 } 344 /* Don't allow the callback to set the session length to zero. 345 * nor set it higher than it was. */ 346 if(!tmp || (tmp > ss->session_id_length)) 347 { 348 /* The callback set an illegal length */ 349 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 350 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 351 SSL_SESSION_free(ss); 352 return(0); 353 } 354 /* If the session length was shrunk and we're SSLv2, pad it */ 355 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 356 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 357 else 358 ss->session_id_length = tmp; 359 /* Finally, check for a conflict */ 360 if(SSL_has_matching_session_id(s, ss->session_id, 361 ss->session_id_length)) 362 { 363 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 364 SSL_R_SSL_SESSION_ID_CONFLICT); 365 SSL_SESSION_free(ss); 366 return(0); 367 } 368 #ifndef OPENSSL_NO_TLSEXT 369 sess_id_done: 370 if (s->tlsext_hostname) { 371 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 372 if (ss->tlsext_hostname == NULL) { 373 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 374 SSL_SESSION_free(ss); 375 return 0; 376 } 377 } 378 #ifndef OPENSSL_NO_EC 379 if (s->tlsext_ecpointformatlist) 380 { 381 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 382 if ((ss->tlsext_ecpointformatlist = OPENSSL_malloc(s->tlsext_ecpointformatlist_length)) == NULL) 383 { 384 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 385 SSL_SESSION_free(ss); 386 return 0; 387 } 388 ss->tlsext_ecpointformatlist_length = s->tlsext_ecpointformatlist_length; 389 memcpy(ss->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 390 } 391 if (s->tlsext_ellipticcurvelist) 392 { 393 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 394 if ((ss->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 395 { 396 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_MALLOC_FAILURE); 397 SSL_SESSION_free(ss); 398 return 0; 399 } 400 ss->tlsext_ellipticcurvelist_length = s->tlsext_ellipticcurvelist_length; 401 memcpy(ss->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 402 } 403 #endif 404 #endif 405 } 406 else 407 { 408 ss->session_id_length=0; 409 } 410 411 if (s->sid_ctx_length > sizeof ss->sid_ctx) 412 { 413 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 414 SSL_SESSION_free(ss); 415 return 0; 416 } 417 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 418 ss->sid_ctx_length=s->sid_ctx_length; 419 s->session=ss; 420 ss->ssl_version=s->version; 421 ss->verify_result = X509_V_OK; 422 423 return(1); 424 } 425 426 int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 427 const unsigned char *limit) 428 { 429 /* This is used only by servers. */ 430 431 SSL_SESSION *ret=NULL; 432 int fatal = 0; 433 #ifndef OPENSSL_NO_TLSEXT 434 int r; 435 #endif 436 437 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 438 goto err; 439 #ifndef OPENSSL_NO_TLSEXT 440 r = tls1_process_ticket(s, session_id, len, limit, &ret); 441 if (r == -1) 442 { 443 fatal = 1; 444 goto err; 445 } 446 else if (r == 0 || (!ret && !len)) 447 goto err; 448 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 449 #else 450 if (len == 0) 451 goto err; 452 if (!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 453 #endif 454 { 455 SSL_SESSION data; 456 data.ssl_version=s->version; 457 data.session_id_length=len; 458 if (len == 0) 459 return 0; 460 memcpy(data.session_id,session_id,len); 461 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 462 ret=lh_SSL_SESSION_retrieve(s->session_ctx->sessions,&data); 463 if (ret != NULL) 464 /* don't allow other threads to steal it: */ 465 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 466 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 467 } 468 469 if (ret == NULL) 470 { 471 int copy=1; 472 473 s->session_ctx->stats.sess_miss++; 474 ret=NULL; 475 if (s->session_ctx->get_session_cb != NULL 476 && (ret=s->session_ctx->get_session_cb(s,session_id,len,©)) 477 != NULL) 478 { 479 s->session_ctx->stats.sess_cb_hit++; 480 481 /* Increment reference count now if the session callback 482 * asks us to do so (note that if the session structures 483 * returned by the callback are shared between threads, 484 * it must handle the reference count itself [i.e. copy == 0], 485 * or things won't be thread-safe). */ 486 if (copy) 487 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 488 489 /* Add the externally cached session to the internal 490 * cache as well if and only if we are supposed to. */ 491 if(!(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 492 /* The following should not return 1, otherwise, 493 * things are very strange */ 494 SSL_CTX_add_session(s->session_ctx,ret); 495 } 496 if (ret == NULL) 497 goto err; 498 } 499 500 /* Now ret is non-NULL, and we own one of its reference counts. */ 501 502 if (ret->sid_ctx_length != s->sid_ctx_length 503 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 504 { 505 /* We've found the session named by the client, but we don't 506 * want to use it in this context. */ 507 508 #if 0 /* The client cannot always know when a session is not appropriate, 509 * so we shouldn't generate an error message. */ 510 511 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 512 #endif 513 goto err; /* treat like cache miss */ 514 } 515 516 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 517 { 518 /* We can't be sure if this session is being used out of 519 * context, which is especially important for SSL_VERIFY_PEER. 520 * The application should have used SSL[_CTX]_set_session_id_context. 521 * 522 * For this error case, we generate an error instead of treating 523 * the event like a cache miss (otherwise it would be easy for 524 * applications to effectively disable the session cache by 525 * accident without anyone noticing). 526 */ 527 528 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 529 fatal = 1; 530 goto err; 531 } 532 533 if (ret->cipher == NULL) 534 { 535 unsigned char buf[5],*p; 536 unsigned long l; 537 538 p=buf; 539 l=ret->cipher_id; 540 l2n(l,p); 541 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 542 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 543 else 544 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 545 if (ret->cipher == NULL) 546 goto err; 547 } 548 549 550 #if 0 /* This is way too late. */ 551 552 /* If a thread got the session, then 'swaped', and another got 553 * it and then due to a time-out decided to 'OPENSSL_free' it we could 554 * be in trouble. So I'll increment it now, then double decrement 555 * later - am I speaking rubbish?. */ 556 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 557 #endif 558 559 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 560 { 561 s->session_ctx->stats.sess_timeout++; 562 /* remove it from the cache */ 563 SSL_CTX_remove_session(s->session_ctx,ret); 564 goto err; 565 } 566 567 s->session_ctx->stats.sess_hit++; 568 569 /* ret->time=time(NULL); */ /* rezero timeout? */ 570 /* again, just leave the session 571 * if it is the same session, we have just incremented and 572 * then decremented the reference count :-) */ 573 if (s->session != NULL) 574 SSL_SESSION_free(s->session); 575 s->session=ret; 576 s->verify_result = s->session->verify_result; 577 return(1); 578 579 err: 580 if (ret != NULL) 581 SSL_SESSION_free(ret); 582 if (fatal) 583 return -1; 584 else 585 return 0; 586 } 587 588 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 589 { 590 int ret=0; 591 SSL_SESSION *s; 592 593 /* add just 1 reference count for the SSL_CTX's session cache 594 * even though it has two ways of access: each session is in a 595 * doubly linked list and an lhash */ 596 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 597 /* if session c is in already in cache, we take back the increment later */ 598 599 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 600 s=lh_SSL_SESSION_insert(ctx->sessions,c); 601 602 /* s != NULL iff we already had a session with the given PID. 603 * In this case, s == c should hold (then we did not really modify 604 * ctx->sessions), or we're in trouble. */ 605 if (s != NULL && s != c) 606 { 607 /* We *are* in trouble ... */ 608 SSL_SESSION_list_remove(ctx,s); 609 SSL_SESSION_free(s); 610 /* ... so pretend the other session did not exist in cache 611 * (we cannot handle two SSL_SESSION structures with identical 612 * session ID in the same cache, which could happen e.g. when 613 * two threads concurrently obtain the same session from an external 614 * cache) */ 615 s = NULL; 616 } 617 618 /* Put at the head of the queue unless it is already in the cache */ 619 if (s == NULL) 620 SSL_SESSION_list_add(ctx,c); 621 622 if (s != NULL) 623 { 624 /* existing cache entry -- decrement previously incremented reference 625 * count because it already takes into account the cache */ 626 627 SSL_SESSION_free(s); /* s == c */ 628 ret=0; 629 } 630 else 631 { 632 /* new cache entry -- remove old ones if cache has become too large */ 633 634 ret=1; 635 636 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 637 { 638 while (SSL_CTX_sess_number(ctx) > 639 SSL_CTX_sess_get_cache_size(ctx)) 640 { 641 if (!remove_session_lock(ctx, 642 ctx->session_cache_tail, 0)) 643 break; 644 else 645 ctx->stats.sess_cache_full++; 646 } 647 } 648 } 649 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 650 return(ret); 651 } 652 653 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 654 { 655 return remove_session_lock(ctx, c, 1); 656 } 657 658 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 659 { 660 SSL_SESSION *r; 661 int ret=0; 662 663 if ((c != NULL) && (c->session_id_length != 0)) 664 { 665 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 666 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 667 { 668 ret=1; 669 r=lh_SSL_SESSION_delete(ctx->sessions,c); 670 SSL_SESSION_list_remove(ctx,c); 671 } 672 673 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 674 675 if (ret) 676 { 677 r->not_resumable=1; 678 if (ctx->remove_session_cb != NULL) 679 ctx->remove_session_cb(ctx,r); 680 SSL_SESSION_free(r); 681 } 682 } 683 else 684 ret=0; 685 return(ret); 686 } 687 688 void SSL_SESSION_free(SSL_SESSION *ss) 689 { 690 int i; 691 692 if(ss == NULL) 693 return; 694 695 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 696 #ifdef REF_PRINT 697 REF_PRINT("SSL_SESSION",ss); 698 #endif 699 if (i > 0) return; 700 #ifdef REF_CHECK 701 if (i < 0) 702 { 703 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 704 abort(); /* ok */ 705 } 706 #endif 707 708 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 709 710 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 711 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 712 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 713 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 714 if (ss->peer != NULL) X509_free(ss->peer); 715 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 716 #ifndef OPENSSL_NO_TLSEXT 717 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 718 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 719 #ifndef OPENSSL_NO_EC 720 ss->tlsext_ecpointformatlist_length = 0; 721 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 722 ss->tlsext_ellipticcurvelist_length = 0; 723 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 724 #endif /* OPENSSL_NO_EC */ 725 #endif 726 #ifndef OPENSSL_NO_PSK 727 if (ss->psk_identity_hint != NULL) 728 OPENSSL_free(ss->psk_identity_hint); 729 if (ss->psk_identity != NULL) 730 OPENSSL_free(ss->psk_identity); 731 #endif 732 OPENSSL_cleanse(ss,sizeof(*ss)); 733 OPENSSL_free(ss); 734 } 735 736 int SSL_set_session(SSL *s, SSL_SESSION *session) 737 { 738 int ret=0; 739 const SSL_METHOD *meth; 740 741 if (session != NULL) 742 { 743 meth=s->ctx->method->get_ssl_method(session->ssl_version); 744 if (meth == NULL) 745 meth=s->method->get_ssl_method(session->ssl_version); 746 if (meth == NULL) 747 { 748 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 749 return(0); 750 } 751 752 if (meth != s->method) 753 { 754 if (!SSL_set_ssl_method(s,meth)) 755 return(0); 756 if (s->ctx->session_timeout == 0) 757 session->timeout=SSL_get_default_timeout(s); 758 else 759 session->timeout=s->ctx->session_timeout; 760 } 761 762 #ifndef OPENSSL_NO_KRB5 763 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 764 session->krb5_client_princ_len > 0) 765 { 766 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 767 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 768 session->krb5_client_princ_len); 769 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 770 } 771 #endif /* OPENSSL_NO_KRB5 */ 772 773 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 774 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 775 if (s->session != NULL) 776 SSL_SESSION_free(s->session); 777 s->session=session; 778 s->verify_result = s->session->verify_result; 779 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 780 ret=1; 781 } 782 else 783 { 784 if (s->session != NULL) 785 { 786 SSL_SESSION_free(s->session); 787 s->session=NULL; 788 } 789 790 meth=s->ctx->method; 791 if (meth != s->method) 792 { 793 if (!SSL_set_ssl_method(s,meth)) 794 return(0); 795 } 796 ret=1; 797 } 798 return(ret); 799 } 800 801 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 802 { 803 if (s == NULL) return(0); 804 s->timeout=t; 805 return(1); 806 } 807 808 long SSL_SESSION_get_timeout(const SSL_SESSION *s) 809 { 810 if (s == NULL) return(0); 811 return(s->timeout); 812 } 813 814 long SSL_SESSION_get_time(const SSL_SESSION *s) 815 { 816 if (s == NULL) return(0); 817 return(s->time); 818 } 819 820 long SSL_SESSION_set_time(SSL_SESSION *s, long t) 821 { 822 if (s == NULL) return(0); 823 s->time=t; 824 return(t); 825 } 826 827 long SSL_CTX_set_timeout(SSL_CTX *s, long t) 828 { 829 long l; 830 if (s == NULL) return(0); 831 l=s->session_timeout; 832 s->session_timeout=t; 833 return(l); 834 } 835 836 long SSL_CTX_get_timeout(const SSL_CTX *s) 837 { 838 if (s == NULL) return(0); 839 return(s->session_timeout); 840 } 841 842 #ifndef OPENSSL_NO_TLSEXT 843 int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 844 STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) 845 { 846 if (s == NULL) return(0); 847 s->tls_session_secret_cb = tls_session_secret_cb; 848 s->tls_session_secret_cb_arg = arg; 849 return(1); 850 } 851 852 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 853 void *arg) 854 { 855 if (s == NULL) return(0); 856 s->tls_session_ticket_ext_cb = cb; 857 s->tls_session_ticket_ext_cb_arg = arg; 858 return(1); 859 } 860 861 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 862 { 863 if (s->version >= TLS1_VERSION) 864 { 865 if (s->tlsext_session_ticket) 866 { 867 OPENSSL_free(s->tlsext_session_ticket); 868 s->tlsext_session_ticket = NULL; 869 } 870 871 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 872 if (!s->tlsext_session_ticket) 873 { 874 SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); 875 return 0; 876 } 877 878 if (ext_data) 879 { 880 s->tlsext_session_ticket->length = ext_len; 881 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 882 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 883 } 884 else 885 { 886 s->tlsext_session_ticket->length = 0; 887 s->tlsext_session_ticket->data = NULL; 888 } 889 890 return 1; 891 } 892 893 return 0; 894 } 895 #endif /* OPENSSL_NO_TLSEXT */ 896 897 typedef struct timeout_param_st 898 { 899 SSL_CTX *ctx; 900 long time; 901 LHASH_OF(SSL_SESSION) *cache; 902 } TIMEOUT_PARAM; 903 904 static void timeout_doall_arg(SSL_SESSION *s, TIMEOUT_PARAM *p) 905 { 906 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 907 { 908 /* The reason we don't call SSL_CTX_remove_session() is to 909 * save on locking overhead */ 910 (void)lh_SSL_SESSION_delete(p->cache,s); 911 SSL_SESSION_list_remove(p->ctx,s); 912 s->not_resumable=1; 913 if (p->ctx->remove_session_cb != NULL) 914 p->ctx->remove_session_cb(p->ctx,s); 915 SSL_SESSION_free(s); 916 } 917 } 918 919 static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION, TIMEOUT_PARAM) 920 921 void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 922 { 923 unsigned long i; 924 TIMEOUT_PARAM tp; 925 926 tp.ctx=s; 927 tp.cache=s->sessions; 928 if (tp.cache == NULL) return; 929 tp.time=t; 930 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 931 i=CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load; 932 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=0; 933 lh_SSL_SESSION_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), 934 TIMEOUT_PARAM, &tp); 935 CHECKED_LHASH_OF(SSL_SESSION, tp.cache)->down_load=i; 936 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 937 } 938 939 int ssl_clear_bad_session(SSL *s) 940 { 941 if ( (s->session != NULL) && 942 !(s->shutdown & SSL_SENT_SHUTDOWN) && 943 !(SSL_in_init(s) || SSL_in_before(s))) 944 { 945 SSL_CTX_remove_session(s->ctx,s->session); 946 return(1); 947 } 948 else 949 return(0); 950 } 951 952 /* locked by SSL_CTX in the calling function */ 953 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 954 { 955 if ((s->next == NULL) || (s->prev == NULL)) return; 956 957 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 958 { /* last element in list */ 959 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 960 { /* only one element in list */ 961 ctx->session_cache_head=NULL; 962 ctx->session_cache_tail=NULL; 963 } 964 else 965 { 966 ctx->session_cache_tail=s->prev; 967 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 968 } 969 } 970 else 971 { 972 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 973 { /* first element in list */ 974 ctx->session_cache_head=s->next; 975 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 976 } 977 else 978 { /* middle of list */ 979 s->next->prev=s->prev; 980 s->prev->next=s->next; 981 } 982 } 983 s->prev=s->next=NULL; 984 } 985 986 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 987 { 988 if ((s->next != NULL) && (s->prev != NULL)) 989 SSL_SESSION_list_remove(ctx,s); 990 991 if (ctx->session_cache_head == NULL) 992 { 993 ctx->session_cache_head=s; 994 ctx->session_cache_tail=s; 995 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 996 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 997 } 998 else 999 { 1000 s->next=ctx->session_cache_head; 1001 s->next->prev=s; 1002 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 1003 ctx->session_cache_head=s; 1004 } 1005 } 1006 1007 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 1008 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 1009 { 1010 ctx->new_session_cb=cb; 1011 } 1012 1013 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1014 { 1015 return ctx->new_session_cb; 1016 } 1017 1018 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1019 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1020 { 1021 ctx->remove_session_cb=cb; 1022 } 1023 1024 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1025 { 1026 return ctx->remove_session_cb; 1027 } 1028 1029 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1030 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1031 unsigned char *data,int len,int *copy)) 1032 { 1033 ctx->get_session_cb=cb; 1034 } 1035 1036 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1037 unsigned char *data,int len,int *copy) 1038 { 1039 return ctx->get_session_cb; 1040 } 1041 1042 void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1043 void (*cb)(const SSL *ssl,int type,int val)) 1044 { 1045 ctx->info_callback=cb; 1046 } 1047 1048 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1049 { 1050 return ctx->info_callback; 1051 } 1052 1053 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1054 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1055 { 1056 ctx->client_cert_cb=cb; 1057 } 1058 1059 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1060 { 1061 return ctx->client_cert_cb; 1062 } 1063 1064 #ifndef OPENSSL_NO_ENGINE 1065 int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 1066 { 1067 if (!ENGINE_init(e)) 1068 { 1069 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 1070 return 0; 1071 } 1072 if(!ENGINE_get_ssl_client_cert_function(e)) 1073 { 1074 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 1075 ENGINE_finish(e); 1076 return 0; 1077 } 1078 ctx->client_cert_engine = e; 1079 return 1; 1080 } 1081 #endif 1082 1083 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1084 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 1085 { 1086 ctx->app_gen_cookie_cb=cb; 1087 } 1088 1089 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1090 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 1091 { 1092 ctx->app_verify_cookie_cb=cb; 1093 } 1094 1095 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1096