1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2005 Nokia. All rights reserved. 112 * 113 * The portions of the attached software ("Contribution") is developed by 114 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 115 * license. 116 * 117 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 118 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 119 * support (see RFC 4279) to OpenSSL. 120 * 121 * No patent licenses or other rights except those expressly stated in 122 * the OpenSSL open source license shall be deemed granted or received 123 * expressly, by implication, estoppel, or otherwise. 124 * 125 * No assurances are provided by Nokia that the Contribution does not 126 * infringe the patent or other intellectual property rights of any third 127 * party or that the license provides you with all the necessary rights 128 * to make use of the Contribution. 129 * 130 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 131 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 132 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 133 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 134 * OTHERWISE. */ 135 136 #include <stdio.h> 137 138 #include <openssl/engine.h> 139 #include <openssl/err.h> 140 #include <openssl/lhash.h> 141 #include <openssl/mem.h> 142 #include <openssl/rand.h> 143 144 #include "ssl_locl.h" 145 146 /* The address of this is a magic value, a pointer to which is returned by 147 * SSL_magic_pending_session_ptr(). It allows a session callback to indicate 148 * that it needs to asynchronously fetch session information. */ 149 static char g_pending_session_magic; 150 151 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s); 152 static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s); 153 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck); 154 155 SSL_SESSION *SSL_magic_pending_session_ptr(void) 156 { 157 return (SSL_SESSION*) &g_pending_session_magic; 158 } 159 160 SSL_SESSION *SSL_get_session(const SSL *ssl) 161 /* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ 162 { 163 return(ssl->session); 164 } 165 166 SSL_SESSION *SSL_get1_session(SSL *ssl) 167 /* variant of SSL_get_session: caller really gets something */ 168 { 169 SSL_SESSION *sess; 170 /* Need to lock this all up rather than just use CRYPTO_add so that 171 * somebody doesn't free ssl->session between when we check it's 172 * non-null and when we up the reference count. */ 173 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 174 sess = ssl->session; 175 if(sess) 176 sess->references++; 177 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 178 return(sess); 179 } 180 181 int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 182 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 183 { 184 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 185 new_func, dup_func, free_func); 186 } 187 188 int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 189 { 190 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg)); 191 } 192 193 void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 194 { 195 return(CRYPTO_get_ex_data(&s->ex_data,idx)); 196 } 197 198 SSL_SESSION *SSL_SESSION_new(void) 199 { 200 SSL_SESSION *ss; 201 202 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION)); 203 if (ss == NULL) 204 { 205 OPENSSL_PUT_ERROR(SSL, SSL_SESSION_new, ERR_R_MALLOC_FAILURE); 206 return(0); 207 } 208 memset(ss,0,sizeof(SSL_SESSION)); 209 210 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 211 ss->references=1; 212 ss->timeout = SSL_DEFAULT_SESSION_TIMEOUT; 213 ss->time=(unsigned long)time(NULL); 214 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 215 return(ss); 216 } 217 218 const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) 219 { 220 if(len) 221 *len = s->session_id_length; 222 return s->session_id; 223 } 224 225 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 226 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 227 * until we have no conflict is going to complete in one iteration pretty much 228 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 229 * and we still can't avoid a conflict - well that's a reasonable point to call 230 * it quits. Either the RAND code is broken or someone is trying to open roughly 231 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 232 * store that many sessions is perhaps a more interesting question ... */ 233 234 #define MAX_SESS_ID_ATTEMPTS 10 235 static int def_generate_session_id(const SSL *ssl, unsigned char *id, 236 unsigned int *id_len) 237 { 238 unsigned int retry = 0; 239 do 240 if (RAND_pseudo_bytes(id, *id_len) <= 0) 241 return 0; 242 while(SSL_has_matching_session_id(ssl, id, *id_len) && 243 (++retry < MAX_SESS_ID_ATTEMPTS)); 244 if(retry < MAX_SESS_ID_ATTEMPTS) 245 return 1; 246 /* else - woops a session_id match */ 247 /* XXX We should also check the external cache -- 248 * but the probability of a collision is negligible, and 249 * we could not prevent the concurrent creation of sessions 250 * with identical IDs since we currently don't have means 251 * to atomically check whether a session ID already exists 252 * and make a reservation for it if it does not 253 * (this problem applies to the internal cache as well). 254 */ 255 return 0; 256 } 257 258 int ssl_get_new_session(SSL *s, int session) 259 { 260 /* This gets used by clients and servers. */ 261 262 unsigned int tmp; 263 SSL_SESSION *ss=NULL; 264 GEN_SESSION_CB cb = def_generate_session_id; 265 266 if (s->mode & SSL_MODE_NO_SESSION_CREATION) 267 { 268 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, SSL_R_SESSION_MAY_NOT_BE_CREATED); 269 return 0; 270 } 271 272 if ((ss=SSL_SESSION_new()) == NULL) return(0); 273 274 /* If the context has a default timeout, use it over the default. */ 275 if (s->initial_ctx->session_timeout != 0) 276 ss->timeout=s->initial_ctx->session_timeout; 277 278 if (s->session != NULL) 279 { 280 SSL_SESSION_free(s->session); 281 s->session=NULL; 282 } 283 284 if (session) 285 { 286 if (s->version == SSL2_VERSION) 287 { 288 ss->ssl_version=SSL2_VERSION; 289 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 290 } 291 else if (s->version == SSL3_VERSION) 292 { 293 ss->ssl_version=SSL3_VERSION; 294 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 295 } 296 else if (s->version == TLS1_VERSION) 297 { 298 ss->ssl_version=TLS1_VERSION; 299 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 300 } 301 else if (s->version == TLS1_1_VERSION) 302 { 303 ss->ssl_version=TLS1_1_VERSION; 304 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 305 } 306 else if (s->version == TLS1_2_VERSION) 307 { 308 ss->ssl_version=TLS1_2_VERSION; 309 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 310 } 311 else if (s->version == DTLS1_VERSION) 312 { 313 ss->ssl_version=DTLS1_VERSION; 314 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 315 } 316 else if (s->version == DTLS1_2_VERSION) 317 { 318 ss->ssl_version=DTLS1_2_VERSION; 319 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 320 } 321 else 322 { 323 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, SSL_R_UNSUPPORTED_SSL_VERSION); 324 SSL_SESSION_free(ss); 325 return(0); 326 } 327 /* If RFC4507 ticket use empty session ID */ 328 if (s->tlsext_ticket_expected) 329 { 330 ss->session_id_length = 0; 331 goto sess_id_done; 332 } 333 /* Choose which callback will set the session ID */ 334 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 335 if(s->generate_session_id) 336 cb = s->generate_session_id; 337 else if(s->initial_ctx->generate_session_id) 338 cb = s->initial_ctx->generate_session_id; 339 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 340 /* Choose a session ID */ 341 tmp = ss->session_id_length; 342 if(!cb(s, ss->session_id, &tmp)) 343 { 344 /* The callback failed */ 345 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, 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 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 355 SSL_SESSION_free(ss); 356 return(0); 357 } 358 /* If the session length was shrunk and we're SSLv2, pad it */ 359 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 360 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 361 else 362 ss->session_id_length = tmp; 363 /* Finally, check for a conflict */ 364 if(SSL_has_matching_session_id(s, ss->session_id, 365 ss->session_id_length)) 366 { 367 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, SSL_R_SSL_SESSION_ID_CONFLICT); 368 SSL_SESSION_free(ss); 369 return(0); 370 } 371 sess_id_done: 372 if (s->tlsext_hostname) { 373 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 374 if (ss->tlsext_hostname == NULL) { 375 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, ERR_R_INTERNAL_ERROR); 376 SSL_SESSION_free(ss); 377 return 0; 378 } 379 } 380 if (s->psk_identity_hint) 381 { 382 ss->psk_identity_hint = BUF_strdup(s->psk_identity_hint); 383 if (ss->psk_identity_hint == NULL) 384 { 385 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, ERR_R_MALLOC_FAILURE); 386 SSL_SESSION_free(ss); 387 return 0; 388 } 389 } 390 } 391 else 392 { 393 ss->session_id_length=0; 394 } 395 396 if (s->sid_ctx_length > sizeof ss->sid_ctx) 397 { 398 OPENSSL_PUT_ERROR(SSL, ssl_get_new_session, ERR_R_INTERNAL_ERROR); 399 SSL_SESSION_free(ss); 400 return 0; 401 } 402 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 403 ss->sid_ctx_length=s->sid_ctx_length; 404 s->session=ss; 405 ss->ssl_version=s->version; 406 ss->verify_result = X509_V_OK; 407 408 return(1); 409 } 410 411 /* ssl_get_prev attempts to find an SSL_SESSION to be used to resume this 412 * connection. It is only called by servers. 413 * 414 * ctx: contains the early callback context, which is the result of a 415 * shallow parse of the ClientHello. 416 * 417 * Returns: 418 * -1: error 419 * 0: a session may have been found. 420 * 421 * Side effects: 422 * - If a session is found then s->session is pointed at it (after freeing an 423 * existing session if need be) and s->verify_result is set from the session. 424 * - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1 425 * if the server should issue a new session ticket (to 0 otherwise). 426 */ 427 int ssl_get_prev_session(SSL *s, const struct ssl_early_callback_ctx *ctx) 428 { 429 /* This is used only by servers. */ 430 431 SSL_SESSION *ret=NULL; 432 int fatal = 0; 433 int try_session_cache = 1; 434 int r; 435 436 if (ctx->session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) 437 goto err; 438 439 if (ctx->session_id_len == 0) 440 try_session_cache = 0; 441 442 r = tls1_process_ticket(s, ctx, &ret); /* sets s->tlsext_ticket_expected */ 443 switch (r) 444 { 445 case -1: /* Error during processing */ 446 fatal = 1; 447 goto err; 448 case 0: /* No ticket found */ 449 case 1: /* Zero length ticket found */ 450 break; /* Ok to carry on processing session id. */ 451 case 2: /* Ticket found but not decrypted. */ 452 case 3: /* Ticket decrypted, *ret has been set. */ 453 try_session_cache = 0; 454 break; 455 default: 456 abort(); 457 } 458 459 if (try_session_cache && 460 ret == NULL && 461 !(s->initial_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 462 { 463 SSL_SESSION data; 464 data.ssl_version=s->version; 465 data.session_id_length=ctx->session_id_len; 466 if (ctx->session_id_len == 0) 467 return 0; 468 memcpy(data.session_id,ctx->session_id,ctx->session_id_len); 469 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 470 ret=lh_SSL_SESSION_retrieve(s->initial_ctx->sessions,&data); 471 if (ret != NULL) 472 { 473 /* don't allow other threads to steal it: */ 474 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 475 } 476 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 477 if (ret == NULL) 478 s->initial_ctx->stats.sess_miss++; 479 } 480 481 if (try_session_cache && 482 ret == NULL && 483 s->initial_ctx->get_session_cb != NULL) 484 { 485 int copy=1; 486 487 if ((ret=s->initial_ctx->get_session_cb(s,(unsigned char *) ctx->session_id,ctx->session_id_len,©))) 488 { 489 if (ret == SSL_magic_pending_session_ptr()) 490 { 491 /* This is a magic value which indicates that 492 * the callback needs to unwind the stack and 493 * figure out the session asynchronously. */ 494 return PENDING_SESSION; 495 } 496 s->initial_ctx->stats.sess_cb_hit++; 497 498 /* Increment reference count now if the session callback 499 * asks us to do so (note that if the session structures 500 * returned by the callback are shared between threads, 501 * it must handle the reference count itself [i.e. copy == 0], 502 * or things won't be thread-safe). */ 503 if (copy) 504 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 505 506 /* Add the externally cached session to the internal 507 * cache as well if and only if we are supposed to. */ 508 if(!(s->initial_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 509 /* The following should not return 1, otherwise, 510 * things are very strange */ 511 SSL_CTX_add_session(s->initial_ctx,ret); 512 } 513 } 514 515 if (ret == NULL) 516 goto err; 517 518 /* Now ret is non-NULL and we own one of its reference counts. */ 519 520 if (ret->sid_ctx_length != s->sid_ctx_length 521 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 522 { 523 /* We have the session requested by the client, but we don't 524 * want to use it in this context. */ 525 goto err; /* treat like cache miss */ 526 } 527 528 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 529 { 530 /* We can't be sure if this session is being used out of 531 * context, which is especially important for SSL_VERIFY_PEER. 532 * The application should have used SSL[_CTX]_set_session_id_context. 533 * 534 * For this error case, we generate an error instead of treating 535 * the event like a cache miss (otherwise it would be easy for 536 * applications to effectively disable the session cache by 537 * accident without anyone noticing). 538 */ 539 540 OPENSSL_PUT_ERROR(SSL, ssl_get_prev_session, SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 541 fatal = 1; 542 goto err; 543 } 544 545 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 546 { 547 s->initial_ctx->stats.sess_timeout++; 548 if (try_session_cache) 549 { 550 /* session was from the cache, so remove it */ 551 SSL_CTX_remove_session(s->initial_ctx,ret); 552 } 553 goto err; 554 } 555 556 s->initial_ctx->stats.sess_hit++; 557 558 if (s->session != NULL) 559 SSL_SESSION_free(s->session); 560 s->session=ret; 561 s->verify_result = s->session->verify_result; 562 return 1; 563 564 err: 565 if (ret != NULL) 566 { 567 SSL_SESSION_free(ret); 568 if (!try_session_cache) 569 { 570 /* The session was from a ticket, so we should 571 * issue a ticket for the new session */ 572 s->tlsext_ticket_expected = 1; 573 } 574 } 575 if (fatal) 576 return -1; 577 else 578 return 0; 579 } 580 581 int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 582 { 583 int ret=0; 584 SSL_SESSION *s; 585 586 /* add just 1 reference count for the SSL_CTX's session cache 587 * even though it has two ways of access: each session is in a 588 * doubly linked list and an lhash */ 589 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 590 /* if session c is in already in cache, we take back the increment later */ 591 592 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 593 if (!lh_SSL_SESSION_insert(ctx->sessions,&s,c)) { 594 return 0; 595 } 596 597 /* s != NULL iff we already had a session with the given PID. 598 * In this case, s == c should hold (then we did not really modify 599 * ctx->sessions), or we're in trouble. */ 600 if (s != NULL && s != c) 601 { 602 /* We *are* in trouble ... */ 603 SSL_SESSION_list_remove(ctx,s); 604 SSL_SESSION_free(s); 605 /* ... so pretend the other session did not exist in cache 606 * (we cannot handle two SSL_SESSION structures with identical 607 * session ID in the same cache, which could happen e.g. when 608 * two threads concurrently obtain the same session from an external 609 * cache) */ 610 s = NULL; 611 } 612 613 /* Put at the head of the queue unless it is already in the cache */ 614 if (s == NULL) 615 SSL_SESSION_list_add(ctx,c); 616 617 if (s != NULL) 618 { 619 /* existing cache entry -- decrement previously incremented reference 620 * count because it already takes into account the cache */ 621 622 SSL_SESSION_free(s); /* s == c */ 623 ret=0; 624 } 625 else 626 { 627 /* new cache entry -- remove old ones if cache has become too large */ 628 629 ret=1; 630 631 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 632 { 633 while (SSL_CTX_sess_number(ctx) > 634 SSL_CTX_sess_get_cache_size(ctx)) 635 { 636 if (!remove_session_lock(ctx, 637 ctx->session_cache_tail, 0)) 638 break; 639 else 640 ctx->stats.sess_cache_full++; 641 } 642 } 643 } 644 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 645 return(ret); 646 } 647 648 int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 649 { 650 return remove_session_lock(ctx, c, 1); 651 } 652 653 static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 654 { 655 SSL_SESSION *r; 656 int ret=0; 657 658 if ((c != NULL) && (c->session_id_length != 0)) 659 { 660 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 661 if ((r = lh_SSL_SESSION_retrieve(ctx->sessions,c)) == c) 662 { 663 ret=1; 664 r=lh_SSL_SESSION_delete(ctx->sessions,c); 665 SSL_SESSION_list_remove(ctx,c); 666 } 667 668 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 669 670 if (ret) 671 { 672 r->not_resumable=1; 673 if (ctx->remove_session_cb != NULL) 674 ctx->remove_session_cb(ctx,r); 675 SSL_SESSION_free(r); 676 } 677 } 678 else 679 ret=0; 680 return(ret); 681 } 682 683 void SSL_SESSION_free(SSL_SESSION *ss) 684 { 685 int i; 686 687 if(ss == NULL) 688 return; 689 690 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 691 #ifdef REF_PRINT 692 REF_PRINT("SSL_SESSION",ss); 693 #endif 694 if (i > 0) return; 695 #ifdef REF_CHECK 696 if (i < 0) 697 { 698 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 699 abort(); /* ok */ 700 } 701 #endif 702 703 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 704 705 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 706 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 707 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 708 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 709 if (ss->peer != NULL) X509_free(ss->peer); 710 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 711 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 712 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 713 ss->tlsext_ecpointformatlist_length = 0; 714 if (ss->tlsext_ecpointformatlist != NULL) OPENSSL_free(ss->tlsext_ecpointformatlist); 715 ss->tlsext_ellipticcurvelist_length = 0; 716 if (ss->tlsext_ellipticcurvelist != NULL) OPENSSL_free(ss->tlsext_ellipticcurvelist); 717 if (ss->tlsext_signed_cert_timestamp_list != NULL) 718 OPENSSL_free(ss->tlsext_signed_cert_timestamp_list); 719 if (ss->ocsp_response != NULL) 720 OPENSSL_free(ss->ocsp_response); 721 if (ss->psk_identity_hint != NULL) 722 OPENSSL_free(ss->psk_identity_hint); 723 if (ss->psk_identity != NULL) 724 OPENSSL_free(ss->psk_identity); 725 OPENSSL_cleanse(ss,sizeof(*ss)); 726 OPENSSL_free(ss); 727 } 728 729 int SSL_set_session(SSL *s, SSL_SESSION *session) 730 { 731 int ret=0; 732 const SSL_METHOD *meth; 733 734 if (session != NULL) 735 { 736 meth=s->ctx->method->get_ssl_method(session->ssl_version); 737 if (meth == NULL) 738 meth=s->method->get_ssl_method(session->ssl_version); 739 if (meth == NULL) 740 { 741 OPENSSL_PUT_ERROR(SSL, SSL_set_session, SSL_R_UNABLE_TO_FIND_SSL_METHOD); 742 return(0); 743 } 744 745 if (meth != s->method) 746 { 747 if (!SSL_set_ssl_method(s,meth)) 748 return(0); 749 } 750 751 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 752 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 753 if (s->session != NULL) 754 SSL_SESSION_free(s->session); 755 s->session=session; 756 s->verify_result = s->session->verify_result; 757 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 758 ret=1; 759 } 760 else 761 { 762 if (s->session != NULL) 763 { 764 SSL_SESSION_free(s->session); 765 s->session=NULL; 766 } 767 768 meth=s->ctx->method; 769 if (meth != s->method) 770 { 771 if (!SSL_set_ssl_method(s,meth)) 772 return(0); 773 } 774 ret=1; 775 } 776 return(ret); 777 } 778 779 long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 780 { 781 if (s == NULL) return(0); 782 s->timeout=t; 783 return(1); 784 } 785 786 long SSL_SESSION_get_timeout(const SSL_SESSION *s) 787 { 788 if (s == NULL) return(0); 789 return(s->timeout); 790 } 791 792 long SSL_SESSION_get_time(const SSL_SESSION *s) 793 { 794 if (s == NULL) return(0); 795 return(s->time); 796 } 797 798 long SSL_SESSION_set_time(SSL_SESSION *s, long t) 799 { 800 if (s == NULL) return(0); 801 s->time=t; 802 return(t); 803 } 804 805 X509 *SSL_SESSION_get0_peer(SSL_SESSION *s) 806 { 807 return s->peer; 808 } 809 810 int SSL_SESSION_set1_id_context(SSL_SESSION *s,const unsigned char *sid_ctx, 811 unsigned int sid_ctx_len) 812 { 813 if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH) 814 { 815 OPENSSL_PUT_ERROR(SSL, SSL_SESSION_set1_id_context, SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG); 816 return 0; 817 } 818 s->sid_ctx_length=sid_ctx_len; 819 memcpy(s->sid_ctx,sid_ctx,sid_ctx_len); 820 821 return 1; 822 } 823 824 long SSL_CTX_set_timeout(SSL_CTX *s, long t) 825 { 826 long l; 827 if (s == NULL) return(0); 828 l=s->session_timeout; 829 s->session_timeout=t; 830 return(l); 831 } 832 833 long SSL_CTX_get_timeout(const SSL_CTX *s) 834 { 835 if (s == NULL) return(0); 836 return(s->session_timeout); 837 } 838 839 int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, 840 STACK_OF(SSL_CIPHER) *peer_ciphers, const SSL_CIPHER **cipher, void *arg), void *arg) 841 { 842 if (s == NULL) return(0); 843 s->tls_session_secret_cb = tls_session_secret_cb; 844 s->tls_session_secret_cb_arg = arg; 845 return(1); 846 } 847 848 int SSL_set_session_ticket_ext_cb(SSL *s, tls_session_ticket_ext_cb_fn cb, 849 void *arg) 850 { 851 if (s == NULL) return(0); 852 s->tls_session_ticket_ext_cb = cb; 853 s->tls_session_ticket_ext_cb_arg = arg; 854 return(1); 855 } 856 857 int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) 858 { 859 if (s->version >= TLS1_VERSION) 860 { 861 if (s->tlsext_session_ticket) 862 { 863 OPENSSL_free(s->tlsext_session_ticket); 864 s->tlsext_session_ticket = NULL; 865 } 866 867 s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); 868 if (!s->tlsext_session_ticket) 869 { 870 OPENSSL_PUT_ERROR(SSL, SSL_set_session_ticket_ext, ERR_R_MALLOC_FAILURE); 871 return 0; 872 } 873 874 if (ext_data) 875 { 876 s->tlsext_session_ticket->length = ext_len; 877 s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; 878 memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); 879 } 880 else 881 { 882 s->tlsext_session_ticket->length = 0; 883 s->tlsext_session_ticket->data = NULL; 884 } 885 886 return 1; 887 } 888 889 return 0; 890 } 891 892 typedef struct timeout_param_st 893 { 894 SSL_CTX *ctx; 895 long time; 896 LHASH_OF(SSL_SESSION) *cache; 897 } TIMEOUT_PARAM; 898 899 static void timeout_doall_arg(SSL_SESSION *sess, void *void_param) 900 { 901 TIMEOUT_PARAM *param = void_param; 902 903 if ((param->time == 0) || (param->time > (sess->time+sess->timeout))) /* timeout */ 904 { 905 /* The reason we don't call SSL_CTX_remove_session() is to 906 * save on locking overhead */ 907 (void)lh_SSL_SESSION_delete(param->cache,sess); 908 SSL_SESSION_list_remove(param->ctx,sess); 909 sess->not_resumable=1; 910 if (param->ctx->remove_session_cb != NULL) 911 param->ctx->remove_session_cb(param->ctx,sess); 912 SSL_SESSION_free(sess); 913 } 914 } 915 916 void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 917 { 918 TIMEOUT_PARAM tp; 919 920 tp.ctx=s; 921 tp.cache=s->sessions; 922 if (tp.cache == NULL) return; 923 tp.time=t; 924 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 925 lh_SSL_SESSION_doall_arg(tp.cache, timeout_doall_arg, &tp); 926 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 927 } 928 929 int ssl_clear_bad_session(SSL *s) 930 { 931 if ( (s->session != NULL) && 932 !(s->shutdown & SSL_SENT_SHUTDOWN) && 933 !(SSL_in_init(s) || SSL_in_before(s))) 934 { 935 SSL_CTX_remove_session(s->ctx,s->session); 936 return(1); 937 } 938 else 939 return(0); 940 } 941 942 /* locked by SSL_CTX in the calling function */ 943 static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 944 { 945 if ((s->next == NULL) || (s->prev == NULL)) return; 946 947 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 948 { /* last element in list */ 949 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 950 { /* only one element in list */ 951 ctx->session_cache_head=NULL; 952 ctx->session_cache_tail=NULL; 953 } 954 else 955 { 956 ctx->session_cache_tail=s->prev; 957 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 958 } 959 } 960 else 961 { 962 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 963 { /* first element in list */ 964 ctx->session_cache_head=s->next; 965 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 966 } 967 else 968 { /* middle of list */ 969 s->next->prev=s->prev; 970 s->prev->next=s->next; 971 } 972 } 973 s->prev=s->next=NULL; 974 } 975 976 static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 977 { 978 if ((s->next != NULL) && (s->prev != NULL)) 979 SSL_SESSION_list_remove(ctx,s); 980 981 if (ctx->session_cache_head == NULL) 982 { 983 ctx->session_cache_head=s; 984 ctx->session_cache_tail=s; 985 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 986 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 987 } 988 else 989 { 990 s->next=ctx->session_cache_head; 991 s->next->prev=s; 992 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 993 ctx->session_cache_head=s; 994 } 995 } 996 997 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 998 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 999 { 1000 ctx->new_session_cb=cb; 1001 } 1002 1003 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 1004 { 1005 return ctx->new_session_cb; 1006 } 1007 1008 void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 1009 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 1010 { 1011 ctx->remove_session_cb=cb; 1012 } 1013 1014 void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 1015 { 1016 return ctx->remove_session_cb; 1017 } 1018 1019 void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 1020 SSL_SESSION *(*cb)(struct ssl_st *ssl, 1021 unsigned char *data,int len,int *copy)) 1022 { 1023 ctx->get_session_cb=cb; 1024 } 1025 1026 SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 1027 unsigned char *data,int len,int *copy) 1028 { 1029 return ctx->get_session_cb; 1030 } 1031 1032 void SSL_CTX_set_info_callback(SSL_CTX *ctx, 1033 void (*cb)(const SSL *ssl,int type,int val)) 1034 { 1035 ctx->info_callback=cb; 1036 } 1037 1038 void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 1039 { 1040 return ctx->info_callback; 1041 } 1042 1043 void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 1044 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 1045 { 1046 ctx->client_cert_cb=cb; 1047 } 1048 1049 int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 1050 { 1051 return ctx->client_cert_cb; 1052 } 1053 1054 void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 1055 int (*cb)(SSL *ssl, uint8_t *cookie, size_t *cookie_len)) 1056 { 1057 ctx->app_gen_cookie_cb=cb; 1058 } 1059 1060 void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 1061 int (*cb)(SSL *ssl, const uint8_t *cookie, size_t cookie_len)) 1062 { 1063 ctx->app_verify_cookie_cb=cb; 1064 } 1065 1066 void SSL_CTX_set_channel_id_cb(SSL_CTX *ctx, 1067 void (*cb)(SSL *ssl, EVP_PKEY **pkey)) 1068 { 1069 ctx->channel_id_cb=cb; 1070 } 1071 1072 void (*SSL_CTX_get_channel_id_cb(SSL_CTX *ctx))(SSL * ssl, EVP_PKEY **pkey) 1073 { 1074 return ctx->channel_id_cb; 1075 } 1076 1077 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION) 1078
