ssl_sess.c revision 306230
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#include <stdio.h> 60#include <openssl/lhash.h> 61#include <openssl/rand.h> 62#ifndef OPENSSL_NO_ENGINE 63# include <openssl/engine.h> 64#endif 65#include "ssl_locl.h" 66 67static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s); 68static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s); 69static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck); 70 71SSL_SESSION *SSL_get_session(const SSL *ssl) 72/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ 73{ 74 return (ssl->session); 75} 76 77SSL_SESSION *SSL_get1_session(SSL *ssl) 78/* variant of SSL_get_session: caller really gets something */ 79{ 80 SSL_SESSION *sess; 81 /* 82 * Need to lock this all up rather than just use CRYPTO_add so that 83 * somebody doesn't free ssl->session between when we check it's non-null 84 * and when we up the reference count. 85 */ 86 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 87 sess = ssl->session; 88 if (sess) 89 sess->references++; 90 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 91 return (sess); 92} 93 94int SSL_SESSION_get_ex_new_index(long argl, void *argp, 95 CRYPTO_EX_new *new_func, 96 CRYPTO_EX_dup *dup_func, 97 CRYPTO_EX_free *free_func) 98{ 99 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 100 new_func, dup_func, free_func); 101} 102 103int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 104{ 105 return (CRYPTO_set_ex_data(&s->ex_data, idx, arg)); 106} 107 108void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 109{ 110 return (CRYPTO_get_ex_data(&s->ex_data, idx)); 111} 112 113SSL_SESSION *SSL_SESSION_new(void) 114{ 115 SSL_SESSION *ss; 116 117 ss = (SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION)); 118 if (ss == NULL) { 119 SSLerr(SSL_F_SSL_SESSION_NEW, ERR_R_MALLOC_FAILURE); 120 return (0); 121 } 122 memset(ss, 0, sizeof(SSL_SESSION)); 123 124 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 125 ss->references = 1; 126 ss->timeout = 60 * 5 + 4; /* 5 minute timeout by default */ 127 ss->time = (unsigned long)time(NULL); 128 ss->prev = NULL; 129 ss->next = NULL; 130 ss->compress_meth = 0; 131#ifndef OPENSSL_NO_TLSEXT 132 ss->tlsext_hostname = NULL; 133#endif 134 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 135 return (ss); 136} 137 138/* 139 * Create a new SSL_SESSION and duplicate the contents of |src| into it. If 140 * ticket == 0 then no ticket information is duplicated, otherwise it is. 141 */ 142SSL_SESSION *ssl_session_dup(SSL_SESSION *src, int ticket) 143{ 144 SSL_SESSION *dest; 145 146 dest = OPENSSL_malloc(sizeof(*src)); 147 if (dest == NULL) { 148 goto err; 149 } 150 memcpy(dest, src, sizeof(*dest)); 151 152 /* 153 * Set the various pointers to NULL so that we can call SSL_SESSION_free in 154 * the case of an error whilst halfway through constructing dest 155 */ 156 dest->ciphers = NULL; 157#ifndef OPENSSL_NO_TLSEXT 158 dest->tlsext_hostname = NULL; 159 dest->tlsext_tick = NULL; 160#endif 161 memset(&dest->ex_data, 0, sizeof(dest->ex_data)); 162 163 /* We deliberately don't copy the prev and next pointers */ 164 dest->prev = NULL; 165 dest->next = NULL; 166 167 dest->references = 1; 168 169 if (src->sess_cert != NULL) 170 CRYPTO_add(&src->sess_cert->references, 1, CRYPTO_LOCK_SSL_SESS_CERT); 171 172 if (src->peer != NULL) 173 CRYPTO_add(&src->peer->references, 1, CRYPTO_LOCK_X509); 174 175 if(src->ciphers != NULL) { 176 dest->ciphers = sk_SSL_CIPHER_dup(src->ciphers); 177 if (dest->ciphers == NULL) 178 goto err; 179 } 180 181 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, 182 &dest->ex_data, &src->ex_data)) { 183 goto err; 184 } 185 186#ifndef OPENSSL_NO_TLSEXT 187 if (src->tlsext_hostname) { 188 dest->tlsext_hostname = BUF_strdup(src->tlsext_hostname); 189 if (dest->tlsext_hostname == NULL) { 190 goto err; 191 } 192 } 193 194 if (ticket != 0) { 195 dest->tlsext_tick = BUF_memdup(src->tlsext_tick, src->tlsext_ticklen); 196 if(dest->tlsext_tick == NULL) 197 goto err; 198 } else { 199 dest->tlsext_tick_lifetime_hint = 0; 200 dest->tlsext_ticklen = 0; 201 } 202#endif 203 204 return dest; 205err: 206 SSLerr(SSL_F_SSL_SESSION_DUP, ERR_R_MALLOC_FAILURE); 207 SSL_SESSION_free(dest); 208 return NULL; 209} 210 211const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, 212 unsigned int *len) 213{ 214 if (len) 215 *len = s->session_id_length; 216 return s->session_id; 217} 218 219/* 220 * Even with SSLv2, we have 16 bytes (128 bits) of session ID space. 221 * SSLv3/TLSv1 has 32 bytes (256 bits). As such, filling the ID with random 222 * gunk repeatedly until we have no conflict is going to complete in one 223 * iteration pretty much "most" of the time (btw: understatement). So, if it 224 * takes us 10 iterations and we still can't avoid a conflict - well that's a 225 * reasonable point to call it quits. Either the RAND code is broken or 226 * someone is trying to open roughly very close to 2^128 (or 2^256) SSL 227 * sessions to our server. How you might store that many sessions is perhaps 228 * a more interesting question ... 229 */ 230 231#define MAX_SESS_ID_ATTEMPTS 10 232static int def_generate_session_id(const SSL *ssl, unsigned char *id, 233 unsigned int *id_len) 234{ 235 unsigned int retry = 0; 236 do 237 if (RAND_pseudo_bytes(id, *id_len) <= 0) 238 return 0; 239 while (SSL_has_matching_session_id(ssl, id, *id_len) && 240 (++retry < MAX_SESS_ID_ATTEMPTS)) ; 241 if (retry < MAX_SESS_ID_ATTEMPTS) 242 return 1; 243 /* else - woops a session_id match */ 244 /* 245 * XXX We should also check the external cache -- but the probability of 246 * a collision is negligible, and we could not prevent the concurrent 247 * creation of sessions with identical IDs since we currently don't have 248 * means to atomically check whether a session ID already exists and make 249 * a reservation for it if it does not (this problem applies to the 250 * internal cache as well). 251 */ 252 return 0; 253} 254 255int ssl_get_new_session(SSL *s, int session) 256{ 257 /* This gets used by clients and servers. */ 258 259 unsigned int tmp; 260 SSL_SESSION *ss = NULL; 261 GEN_SESSION_CB cb = def_generate_session_id; 262 263 if ((ss = SSL_SESSION_new()) == NULL) 264 return (0); 265 266 /* If the context has a default timeout, use it */ 267 if (s->ctx->session_timeout == 0) 268 ss->timeout = SSL_get_default_timeout(s); 269 else 270 ss->timeout = s->ctx->session_timeout; 271 272 if (s->session != NULL) { 273 SSL_SESSION_free(s->session); 274 s->session = NULL; 275 } 276 277 if (session) { 278 if (s->version == SSL2_VERSION) { 279 ss->ssl_version = SSL2_VERSION; 280 ss->session_id_length = SSL2_SSL_SESSION_ID_LENGTH; 281 } else if (s->version == SSL3_VERSION) { 282 ss->ssl_version = SSL3_VERSION; 283 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; 284 } else if (s->version == TLS1_VERSION) { 285 ss->ssl_version = TLS1_VERSION; 286 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; 287 } else if (s->version == DTLS1_BAD_VER) { 288 ss->ssl_version = DTLS1_BAD_VER; 289 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; 290 } else if (s->version == DTLS1_VERSION) { 291 ss->ssl_version = DTLS1_VERSION; 292 ss->session_id_length = SSL3_SSL_SESSION_ID_LENGTH; 293 } else { 294 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION); 295 SSL_SESSION_free(ss); 296 return (0); 297 } 298#ifndef OPENSSL_NO_TLSEXT 299 /* If RFC4507 ticket use empty session ID */ 300 if (s->tlsext_ticket_expected) { 301 ss->session_id_length = 0; 302 goto sess_id_done; 303 } 304#endif 305 /* Choose which callback will set the session ID */ 306 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 307 if (s->generate_session_id) 308 cb = s->generate_session_id; 309 else if (s->ctx->generate_session_id) 310 cb = s->ctx->generate_session_id; 311 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 312 /* Choose a session ID */ 313 tmp = ss->session_id_length; 314 if (!cb(s, ss->session_id, &tmp)) { 315 /* The callback failed */ 316 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 317 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 318 SSL_SESSION_free(ss); 319 return (0); 320 } 321 /* 322 * Don't allow the callback to set the session length to zero. nor 323 * set it higher than it was. 324 */ 325 if (!tmp || (tmp > ss->session_id_length)) { 326 /* The callback set an illegal length */ 327 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 328 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 329 SSL_SESSION_free(ss); 330 return (0); 331 } 332 /* If the session length was shrunk and we're SSLv2, pad it */ 333 if ((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 334 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 335 else 336 ss->session_id_length = tmp; 337 /* Finally, check for a conflict */ 338 if (SSL_has_matching_session_id(s, ss->session_id, 339 ss->session_id_length)) { 340 SSLerr(SSL_F_SSL_GET_NEW_SESSION, SSL_R_SSL_SESSION_ID_CONFLICT); 341 SSL_SESSION_free(ss); 342 return (0); 343 } 344#ifndef OPENSSL_NO_TLSEXT 345 sess_id_done: 346 if (s->tlsext_hostname) { 347 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 348 if (ss->tlsext_hostname == NULL) { 349 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 350 SSL_SESSION_free(ss); 351 return 0; 352 } 353 } 354#endif 355 } else { 356 ss->session_id_length = 0; 357 } 358 359 if (s->sid_ctx_length > sizeof ss->sid_ctx) { 360 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 361 SSL_SESSION_free(ss); 362 return 0; 363 } 364 memcpy(ss->sid_ctx, s->sid_ctx, s->sid_ctx_length); 365 ss->sid_ctx_length = s->sid_ctx_length; 366 s->session = ss; 367 ss->ssl_version = s->version; 368 ss->verify_result = X509_V_OK; 369 370 return (1); 371} 372 373int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 374 const unsigned char *limit) 375{ 376 /* This is used only by servers. */ 377 378 SSL_SESSION *ret = NULL; 379 int fatal = 0; 380#ifndef OPENSSL_NO_TLSEXT 381 int r; 382#endif 383 384 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 385 goto err; 386 387 if (limit - session_id < len) { 388 fatal = 1; 389 goto err; 390 } 391 392#ifndef OPENSSL_NO_TLSEXT 393 r = tls1_process_ticket(s, session_id, len, limit, &ret); 394 if (r == -1) { 395 fatal = 1; 396 goto err; 397 } else if (r == 0 || (!ret && !len)) 398 goto err; 399 else if (!ret 400 && !(s->session_ctx->session_cache_mode & 401 SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 402#else 403 if (len == 0) 404 goto err; 405 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 406#endif 407 { 408 SSL_SESSION data; 409 data.ssl_version = s->version; 410 data.session_id_length = len; 411 if (len == 0) 412 return 0; 413 memcpy(data.session_id, session_id, len); 414 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 415 ret = (SSL_SESSION *)lh_retrieve(s->ctx->sessions, &data); 416 if (ret != NULL) 417 /* don't allow other threads to steal it: */ 418 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); 419 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 420 } 421 422 if (ret == NULL) { 423 int copy = 1; 424 425 s->ctx->stats.sess_miss++; 426 ret = NULL; 427 if (s->ctx->get_session_cb != NULL 428 && (ret = s->ctx->get_session_cb(s, session_id, len, ©)) 429 != NULL) { 430 s->ctx->stats.sess_cb_hit++; 431 432 /* 433 * Increment reference count now if the session callback asks us 434 * to do so (note that if the session structures returned by the 435 * callback are shared between threads, it must handle the 436 * reference count itself [i.e. copy == 0], or things won't be 437 * thread-safe). 438 */ 439 if (copy) 440 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); 441 442 /* 443 * Add the externally cached session to the internal cache as 444 * well if and only if we are supposed to. 445 */ 446 if (! 447 (s-> 448 ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 449 /* 450 * The following should not return 1, otherwise, things are 451 * very strange 452 */ 453 SSL_CTX_add_session(s->ctx, ret); 454 } 455 if (ret == NULL) 456 goto err; 457 } 458 459 /* Now ret is non-NULL, and we own one of its reference counts. */ 460 461 if (ret->sid_ctx_length != s->sid_ctx_length 462 || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) { 463 /* 464 * We've found the session named by the client, but we don't want to 465 * use it in this context. 466 */ 467 468#if 0 /* The client cannot always know when a 469 * session is not appropriate, so we 470 * shouldn't generate an error message. */ 471 472 SSLerr(SSL_F_SSL_GET_PREV_SESSION, 473 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 474#endif 475 goto err; /* treat like cache miss */ 476 } 477 478 if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) { 479 /* 480 * We can't be sure if this session is being used out of context, 481 * which is especially important for SSL_VERIFY_PEER. The application 482 * should have used SSL[_CTX]_set_session_id_context. For this error 483 * case, we generate an error instead of treating the event like a 484 * cache miss (otherwise it would be easy for applications to 485 * effectively disable the session cache by accident without anyone 486 * noticing). 487 */ 488 489 SSLerr(SSL_F_SSL_GET_PREV_SESSION, 490 SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 491 fatal = 1; 492 goto err; 493 } 494 495 if (ret->cipher == NULL) { 496 unsigned char buf[5], *p; 497 unsigned long l; 498 499 p = buf; 500 l = ret->cipher_id; 501 l2n(l, p); 502 if ((ret->ssl_version >> 8) >= SSL3_VERSION_MAJOR) 503 ret->cipher = ssl_get_cipher_by_char(s, &(buf[2])); 504 else 505 ret->cipher = ssl_get_cipher_by_char(s, &(buf[1])); 506 if (ret->cipher == NULL) 507 goto err; 508 } 509#if 0 /* This is way too late. */ 510 511 /* 512 * If a thread got the session, then 'swaped', and another got it and 513 * then due to a time-out decided to 'OPENSSL_free' it we could be in 514 * trouble. So I'll increment it now, then double decrement later - am I 515 * speaking rubbish?. 516 */ 517 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_SSL_SESSION); 518#endif 519 520 if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */ 521 s->ctx->stats.sess_timeout++; 522 /* remove it from the cache */ 523 SSL_CTX_remove_session(s->ctx, ret); 524 goto err; 525 } 526 527 s->ctx->stats.sess_hit++; 528 529 /*- ret->time=time(NULL); *//* 530 * rezero timeout? 531 */ 532 /* 533 * again, just leave the session if it is the same session, we have just 534 * incremented and then decremented the reference count :-) 535 */ 536 if (s->session != NULL) 537 SSL_SESSION_free(s->session); 538 s->session = ret; 539 s->verify_result = s->session->verify_result; 540 return (1); 541 542 err: 543 if (ret != NULL) 544 SSL_SESSION_free(ret); 545 if (fatal) 546 return -1; 547 else 548 return 0; 549} 550 551int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 552{ 553 int ret = 0; 554 SSL_SESSION *s; 555 556 /* 557 * add just 1 reference count for the SSL_CTX's session cache even though 558 * it has two ways of access: each session is in a doubly linked list and 559 * an lhash 560 */ 561 CRYPTO_add(&c->references, 1, CRYPTO_LOCK_SSL_SESSION); 562 /* 563 * if session c is in already in cache, we take back the increment later 564 */ 565 566 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 567 s = (SSL_SESSION *)lh_insert(ctx->sessions, c); 568 569 /* 570 * s != NULL iff we already had a session with the given PID. In this 571 * case, s == c should hold (then we did not really modify 572 * ctx->sessions), or we're in trouble. 573 */ 574 if (s != NULL && s != c) { 575 /* We *are* in trouble ... */ 576 SSL_SESSION_list_remove(ctx, s); 577 SSL_SESSION_free(s); 578 /* 579 * ... so pretend the other session did not exist in cache (we cannot 580 * handle two SSL_SESSION structures with identical session ID in the 581 * same cache, which could happen e.g. when two threads concurrently 582 * obtain the same session from an external cache) 583 */ 584 s = NULL; 585 } 586 587 /* Put at the head of the queue unless it is already in the cache */ 588 if (s == NULL) 589 SSL_SESSION_list_add(ctx, c); 590 591 if (s != NULL) { 592 /* 593 * existing cache entry -- decrement previously incremented reference 594 * count because it already takes into account the cache 595 */ 596 597 SSL_SESSION_free(s); /* s == c */ 598 ret = 0; 599 } else { 600 /* 601 * new cache entry -- remove old ones if cache has become too large 602 */ 603 604 ret = 1; 605 606 if (SSL_CTX_sess_get_cache_size(ctx) > 0) { 607 while (SSL_CTX_sess_number(ctx) > 608 SSL_CTX_sess_get_cache_size(ctx)) { 609 if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) 610 break; 611 else 612 ctx->stats.sess_cache_full++; 613 } 614 } 615 } 616 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 617 return (ret); 618} 619 620int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 621{ 622 return remove_session_lock(ctx, c, 1); 623} 624 625static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 626{ 627 SSL_SESSION *r; 628 int ret = 0; 629 630 if ((c != NULL) && (c->session_id_length != 0)) { 631 if (lck) 632 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 633 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions, c)) == c) { 634 ret = 1; 635 r = (SSL_SESSION *)lh_delete(ctx->sessions, c); 636 SSL_SESSION_list_remove(ctx, c); 637 } 638 639 if (lck) 640 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 641 642 if (ret) { 643 r->not_resumable = 1; 644 if (ctx->remove_session_cb != NULL) 645 ctx->remove_session_cb(ctx, r); 646 SSL_SESSION_free(r); 647 } 648 } else 649 ret = 0; 650 return (ret); 651} 652 653void SSL_SESSION_free(SSL_SESSION *ss) 654{ 655 int i; 656 657 if (ss == NULL) 658 return; 659 660 i = CRYPTO_add(&ss->references, -1, CRYPTO_LOCK_SSL_SESSION); 661#ifdef REF_PRINT 662 REF_PRINT("SSL_SESSION", ss); 663#endif 664 if (i > 0) 665 return; 666#ifdef REF_CHECK 667 if (i < 0) { 668 fprintf(stderr, "SSL_SESSION_free, bad reference count\n"); 669 abort(); /* ok */ 670 } 671#endif 672 673 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 674 675 OPENSSL_cleanse(ss->key_arg, sizeof ss->key_arg); 676 OPENSSL_cleanse(ss->master_key, sizeof ss->master_key); 677 OPENSSL_cleanse(ss->session_id, sizeof ss->session_id); 678 if (ss->sess_cert != NULL) 679 ssl_sess_cert_free(ss->sess_cert); 680 if (ss->peer != NULL) 681 X509_free(ss->peer); 682 if (ss->ciphers != NULL) 683 sk_SSL_CIPHER_free(ss->ciphers); 684#ifndef OPENSSL_NO_TLSEXT 685 if (ss->tlsext_hostname != NULL) 686 OPENSSL_free(ss->tlsext_hostname); 687 if (ss->tlsext_tick != NULL) 688 OPENSSL_free(ss->tlsext_tick); 689#endif 690 OPENSSL_cleanse(ss, sizeof(*ss)); 691 OPENSSL_free(ss); 692} 693 694int SSL_set_session(SSL *s, SSL_SESSION *session) 695{ 696 int ret = 0; 697 SSL_METHOD *meth; 698 699 if (session != NULL) { 700 meth = s->ctx->method->get_ssl_method(session->ssl_version); 701 if (meth == NULL) 702 meth = s->method->get_ssl_method(session->ssl_version); 703 if (meth == NULL) { 704 SSLerr(SSL_F_SSL_SET_SESSION, SSL_R_UNABLE_TO_FIND_SSL_METHOD); 705 return (0); 706 } 707 708 if (meth != s->method) { 709 if (!SSL_set_ssl_method(s, meth)) 710 return (0); 711 if (s->ctx->session_timeout == 0) 712 session->timeout = SSL_get_default_timeout(s); 713 else 714 session->timeout = s->ctx->session_timeout; 715 } 716#ifndef OPENSSL_NO_KRB5 717 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 718 session->krb5_client_princ_len > 0) { 719 s->kssl_ctx->client_princ = 720 (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 721 memcpy(s->kssl_ctx->client_princ, session->krb5_client_princ, 722 session->krb5_client_princ_len); 723 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 724 } 725#endif /* OPENSSL_NO_KRB5 */ 726 727 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL); */ 728 CRYPTO_add(&session->references, 1, CRYPTO_LOCK_SSL_SESSION); 729 if (s->session != NULL) 730 SSL_SESSION_free(s->session); 731 s->session = session; 732 s->verify_result = s->session->verify_result; 733 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL); */ 734 ret = 1; 735 } else { 736 if (s->session != NULL) { 737 SSL_SESSION_free(s->session); 738 s->session = NULL; 739 } 740 741 meth = s->ctx->method; 742 if (meth != s->method) { 743 if (!SSL_set_ssl_method(s, meth)) 744 return (0); 745 } 746 ret = 1; 747 } 748 return (ret); 749} 750 751long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 752{ 753 if (s == NULL) 754 return (0); 755 s->timeout = t; 756 return (1); 757} 758 759long SSL_SESSION_get_timeout(const SSL_SESSION *s) 760{ 761 if (s == NULL) 762 return (0); 763 return (s->timeout); 764} 765 766long SSL_SESSION_get_time(const SSL_SESSION *s) 767{ 768 if (s == NULL) 769 return (0); 770 return (s->time); 771} 772 773long SSL_SESSION_set_time(SSL_SESSION *s, long t) 774{ 775 if (s == NULL) 776 return (0); 777 s->time = t; 778 return (t); 779} 780 781long SSL_CTX_set_timeout(SSL_CTX *s, long t) 782{ 783 long l; 784 if (s == NULL) 785 return (0); 786 l = s->session_timeout; 787 s->session_timeout = t; 788 return (l); 789} 790 791long SSL_CTX_get_timeout(const SSL_CTX *s) 792{ 793 if (s == NULL) 794 return (0); 795 return (s->session_timeout); 796} 797 798typedef struct timeout_param_st { 799 SSL_CTX *ctx; 800 long time; 801 LHASH *cache; 802} TIMEOUT_PARAM; 803 804static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p) 805{ 806 if ((p->time == 0) || (p->time > (s->time + s->timeout))) { /* timeout */ 807 /* 808 * The reason we don't call SSL_CTX_remove_session() is to save on 809 * locking overhead 810 */ 811 lh_delete(p->cache, s); 812 SSL_SESSION_list_remove(p->ctx, s); 813 s->not_resumable = 1; 814 if (p->ctx->remove_session_cb != NULL) 815 p->ctx->remove_session_cb(p->ctx, s); 816 SSL_SESSION_free(s); 817 } 818} 819 820static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *) 821 822void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 823{ 824 unsigned long i; 825 TIMEOUT_PARAM tp; 826 827 tp.ctx = s; 828 tp.cache = s->sessions; 829 if (tp.cache == NULL) 830 return; 831 tp.time = t; 832 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 833 i = tp.cache->down_load; 834 tp.cache->down_load = 0; 835 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp); 836 tp.cache->down_load = i; 837 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 838} 839 840int ssl_clear_bad_session(SSL *s) 841{ 842 if ((s->session != NULL) && 843 !(s->shutdown & SSL_SENT_SHUTDOWN) && 844 !(SSL_in_init(s) || SSL_in_before(s))) { 845 SSL_CTX_remove_session(s->ctx, s->session); 846 return (1); 847 } else 848 return (0); 849} 850 851/* locked by SSL_CTX in the calling function */ 852static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 853{ 854 if ((s->next == NULL) || (s->prev == NULL)) 855 return; 856 857 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) { 858 /* last element in list */ 859 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) { 860 /* only one element in list */ 861 ctx->session_cache_head = NULL; 862 ctx->session_cache_tail = NULL; 863 } else { 864 ctx->session_cache_tail = s->prev; 865 s->prev->next = (SSL_SESSION *)&(ctx->session_cache_tail); 866 } 867 } else { 868 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) { 869 /* first element in list */ 870 ctx->session_cache_head = s->next; 871 s->next->prev = (SSL_SESSION *)&(ctx->session_cache_head); 872 } else { 873 /* middle of list */ 874 s->next->prev = s->prev; 875 s->prev->next = s->next; 876 } 877 } 878 s->prev = s->next = NULL; 879} 880 881static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 882{ 883 if ((s->next != NULL) && (s->prev != NULL)) 884 SSL_SESSION_list_remove(ctx, s); 885 886 if (ctx->session_cache_head == NULL) { 887 ctx->session_cache_head = s; 888 ctx->session_cache_tail = s; 889 s->prev = (SSL_SESSION *)&(ctx->session_cache_head); 890 s->next = (SSL_SESSION *)&(ctx->session_cache_tail); 891 } else { 892 s->next = ctx->session_cache_head; 893 s->next->prev = s; 894 s->prev = (SSL_SESSION *)&(ctx->session_cache_head); 895 ctx->session_cache_head = s; 896 } 897} 898 899void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 900 int (*cb) (struct ssl_st *ssl, 901 SSL_SESSION *sess)) 902{ 903 ctx->new_session_cb = cb; 904} 905 906int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)) (SSL *ssl, SSL_SESSION *sess) { 907 return ctx->new_session_cb; 908} 909 910void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 911 void (*cb) (SSL_CTX *ctx, SSL_SESSION *sess)) 912{ 913 ctx->remove_session_cb = cb; 914} 915 916void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)) (SSL_CTX *ctx, 917 SSL_SESSION *sess) { 918 return ctx->remove_session_cb; 919} 920 921void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 922 SSL_SESSION *(*cb) (struct ssl_st *ssl, 923 unsigned char *data, int len, 924 int *copy)) 925{ 926 ctx->get_session_cb = cb; 927} 928 929SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx)) (SSL *ssl, 930 unsigned char *data, 931 int len, int *copy) { 932 return ctx->get_session_cb; 933} 934 935void SSL_CTX_set_info_callback(SSL_CTX *ctx, 936 void (*cb) (const SSL *ssl, int type, int val)) 937{ 938 ctx->info_callback = cb; 939} 940 941void (*SSL_CTX_get_info_callback(SSL_CTX *ctx)) (const SSL *ssl, int type, 942 int val) { 943 return ctx->info_callback; 944} 945 946void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 947 int (*cb) (SSL *ssl, X509 **x509, 948 EVP_PKEY **pkey)) 949{ 950 ctx->client_cert_cb = cb; 951} 952 953int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx)) (SSL *ssl, X509 **x509, 954 EVP_PKEY **pkey) { 955 return ctx->client_cert_cb; 956} 957 958#ifndef OPENSSL_NO_ENGINE 959int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 960{ 961 if (!ENGINE_init(e)) { 962 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 963 return 0; 964 } 965 if (!ENGINE_get_ssl_client_cert_function(e)) { 966 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, 967 SSL_R_NO_CLIENT_CERT_METHOD); 968 ENGINE_finish(e); 969 return 0; 970 } 971 ctx->client_cert_engine = e; 972 return 1; 973} 974#endif 975 976void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 977 int (*cb) (SSL *ssl, 978 unsigned char *cookie, 979 unsigned int *cookie_len)) 980{ 981 ctx->app_gen_cookie_cb = cb; 982} 983 984void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 985 int (*cb) (SSL *ssl, unsigned char *cookie, 986 unsigned int cookie_len)) 987{ 988 ctx->app_verify_cookie_cb = cb; 989} 990