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