ssl_sess.c revision 284295
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 /* Need to lock this all up rather than just use CRYPTO_add so that 82 * somebody doesn't free ssl->session between when we check it's 83 * non-null and when we up the reference count. */ 84 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 85 sess = ssl->session; 86 if(sess) 87 sess->references++; 88 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 89 return(sess); 90 } 91 92int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 93 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 94 { 95 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 96 new_func, dup_func, free_func); 97 } 98 99int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 100 { 101 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg)); 102 } 103 104void *SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx) 105 { 106 return(CRYPTO_get_ex_data(&s->ex_data,idx)); 107 } 108 109SSL_SESSION *SSL_SESSION_new(void) 110 { 111 SSL_SESSION *ss; 112 113 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION)); 114 if (ss == NULL) 115 { 116 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE); 117 return(0); 118 } 119 memset(ss,0,sizeof(SSL_SESSION)); 120 121 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 122 ss->references=1; 123 ss->timeout=60*5+4; /* 5 minute timeout by default */ 124 ss->time=(unsigned long)time(NULL); 125 ss->prev=NULL; 126 ss->next=NULL; 127 ss->compress_meth=0; 128#ifndef OPENSSL_NO_TLSEXT 129 ss->tlsext_hostname = NULL; 130#endif 131 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 132 return(ss); 133 } 134 135/* 136 * Create a new SSL_SESSION and duplicate the contents of |src| into it. If 137 * ticket == 0 then no ticket information is duplicated, otherwise it is. 138 */ 139SSL_SESSION *ssl_session_dup(SSL_SESSION *src, int ticket) 140{ 141 SSL_SESSION *dest; 142 143 dest = OPENSSL_malloc(sizeof(*src)); 144 if (dest == NULL) { 145 goto err; 146 } 147 memcpy(dest, src, sizeof(*dest)); 148 149 /* 150 * Set the various pointers to NULL so that we can call SSL_SESSION_free in 151 * the case of an error whilst halfway through constructing dest 152 */ 153 dest->ciphers = NULL; 154#ifndef OPENSSL_NO_TLSEXT 155 dest->tlsext_hostname = NULL; 156#endif 157 dest->tlsext_tick = NULL; 158 memset(&dest->ex_data, 0, sizeof(dest->ex_data)); 159 160 /* We deliberately don't copy the prev and next pointers */ 161 dest->prev = NULL; 162 dest->next = NULL; 163 164 dest->references = 1; 165 166 if (src->sess_cert != NULL) 167 CRYPTO_add(&src->sess_cert->references, 1, CRYPTO_LOCK_SSL_SESS_CERT); 168 169 if (src->peer != NULL) 170 CRYPTO_add(&src->peer->references, 1, CRYPTO_LOCK_X509); 171 172 if(src->ciphers != NULL) { 173 dest->ciphers = sk_SSL_CIPHER_dup(src->ciphers); 174 if (dest->ciphers == NULL) 175 goto err; 176 } 177 178 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, 179 &dest->ex_data, &src->ex_data)) { 180 goto err; 181 } 182 183#ifndef OPENSSL_NO_TLSEXT 184 if (src->tlsext_hostname) { 185 dest->tlsext_hostname = BUF_strdup(src->tlsext_hostname); 186 if (dest->tlsext_hostname == NULL) { 187 goto err; 188 } 189 } 190#endif 191 192 if (ticket != 0) { 193 dest->tlsext_tick = BUF_memdup(src->tlsext_tick, src->tlsext_ticklen); 194 if(dest->tlsext_tick == NULL) 195 goto err; 196 } else { 197 dest->tlsext_tick_lifetime_hint = 0; 198 dest->tlsext_ticklen = 0; 199 } 200 201 return dest; 202err: 203 SSLerr(SSL_F_SSL_SESSION_DUP, ERR_R_MALLOC_FAILURE); 204 SSL_SESSION_free(dest); 205 return NULL; 206} 207 208const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len) 209 { 210 if(len) 211 *len = s->session_id_length; 212 return s->session_id; 213 } 214 215/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 216 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 217 * until we have no conflict is going to complete in one iteration pretty much 218 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 219 * and we still can't avoid a conflict - well that's a reasonable point to call 220 * it quits. Either the RAND code is broken or someone is trying to open roughly 221 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 222 * store that many sessions is perhaps a more interesting question ... */ 223 224#define MAX_SESS_ID_ATTEMPTS 10 225static int def_generate_session_id(const SSL *ssl, unsigned char *id, 226 unsigned int *id_len) 227{ 228 unsigned int retry = 0; 229 do 230 if (RAND_pseudo_bytes(id, *id_len) <= 0) 231 return 0; 232 while(SSL_has_matching_session_id(ssl, id, *id_len) && 233 (++retry < MAX_SESS_ID_ATTEMPTS)); 234 if(retry < MAX_SESS_ID_ATTEMPTS) 235 return 1; 236 /* else - woops a session_id match */ 237 /* XXX We should also check the external cache -- 238 * but the probability of a collision is negligible, and 239 * we could not prevent the concurrent creation of sessions 240 * with identical IDs since we currently don't have means 241 * to atomically check whether a session ID already exists 242 * and make a reservation for it if it does not 243 * (this problem applies to the internal cache as well). 244 */ 245 return 0; 246} 247 248int ssl_get_new_session(SSL *s, int session) 249 { 250 /* This gets used by clients and servers. */ 251 252 unsigned int tmp; 253 SSL_SESSION *ss=NULL; 254 GEN_SESSION_CB cb = def_generate_session_id; 255 256 if ((ss=SSL_SESSION_new()) == NULL) return(0); 257 258 /* If the context has a default timeout, use it */ 259 if (s->ctx->session_timeout == 0) 260 ss->timeout=SSL_get_default_timeout(s); 261 else 262 ss->timeout=s->ctx->session_timeout; 263 264 if (s->session != NULL) 265 { 266 SSL_SESSION_free(s->session); 267 s->session=NULL; 268 } 269 270 if (session) 271 { 272 if (s->version == SSL2_VERSION) 273 { 274 ss->ssl_version=SSL2_VERSION; 275 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 276 } 277 else if (s->version == SSL3_VERSION) 278 { 279 ss->ssl_version=SSL3_VERSION; 280 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 281 } 282 else if (s->version == TLS1_VERSION) 283 { 284 ss->ssl_version=TLS1_VERSION; 285 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 286 } 287 else if (s->version == DTLS1_BAD_VER) 288 { 289 ss->ssl_version=DTLS1_BAD_VER; 290 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 291 } 292 else if (s->version == DTLS1_VERSION) 293 { 294 ss->ssl_version=DTLS1_VERSION; 295 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 296 } 297 else 298 { 299 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 300 SSL_SESSION_free(ss); 301 return(0); 302 } 303#ifndef OPENSSL_NO_TLSEXT 304 /* If RFC4507 ticket use empty session ID */ 305 if (s->tlsext_ticket_expected) 306 { 307 ss->session_id_length = 0; 308 goto sess_id_done; 309 } 310#endif 311 /* Choose which callback will set the session ID */ 312 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 313 if(s->generate_session_id) 314 cb = s->generate_session_id; 315 else if(s->ctx->generate_session_id) 316 cb = s->ctx->generate_session_id; 317 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 318 /* Choose a session ID */ 319 tmp = ss->session_id_length; 320 if(!cb(s, ss->session_id, &tmp)) 321 { 322 /* The callback failed */ 323 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 324 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 325 SSL_SESSION_free(ss); 326 return(0); 327 } 328 /* Don't allow the callback to set the session length to zero. 329 * nor set it higher than it was. */ 330 if(!tmp || (tmp > ss->session_id_length)) 331 { 332 /* The callback set an illegal length */ 333 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 334 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 335 SSL_SESSION_free(ss); 336 return(0); 337 } 338 /* If the session length was shrunk and we're SSLv2, pad it */ 339 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 340 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 341 else 342 ss->session_id_length = tmp; 343 /* Finally, check for a conflict */ 344 if(SSL_has_matching_session_id(s, ss->session_id, 345 ss->session_id_length)) 346 { 347 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 348 SSL_R_SSL_SESSION_ID_CONFLICT); 349 SSL_SESSION_free(ss); 350 return(0); 351 } 352#ifndef OPENSSL_NO_TLSEXT 353 sess_id_done: 354 if (s->tlsext_hostname) { 355 ss->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 356 if (ss->tlsext_hostname == NULL) { 357 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 358 SSL_SESSION_free(ss); 359 return 0; 360 } 361 } 362#endif 363 } 364 else 365 { 366 ss->session_id_length=0; 367 } 368 369 if (s->sid_ctx_length > sizeof ss->sid_ctx) 370 { 371 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 372 SSL_SESSION_free(ss); 373 return 0; 374 } 375 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 376 ss->sid_ctx_length=s->sid_ctx_length; 377 s->session=ss; 378 ss->ssl_version=s->version; 379 ss->verify_result = X509_V_OK; 380 381 return(1); 382 } 383 384int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len, 385 const unsigned char *limit) 386 { 387 /* This is used only by servers. */ 388 389 SSL_SESSION *ret=NULL; 390 int fatal = 0; 391#ifndef OPENSSL_NO_TLSEXT 392 int r; 393#endif 394 395 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 396 goto err; 397#ifndef OPENSSL_NO_TLSEXT 398 r = tls1_process_ticket(s, session_id, len, limit, &ret); 399 if (r == -1) 400 { 401 fatal = 1; 402 goto err; 403 } 404 else if (r == 0 || (!ret && !len)) 405 goto err; 406 else if (!ret && !(s->session_ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 407#else 408 if (len == 0) 409 goto err; 410 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 411#endif 412 { 413 SSL_SESSION data; 414 data.ssl_version=s->version; 415 data.session_id_length=len; 416 if (len == 0) 417 return 0; 418 memcpy(data.session_id,session_id,len); 419 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 420 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data); 421 if (ret != NULL) 422 /* don't allow other threads to steal it: */ 423 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 424 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 425 } 426 427 if (ret == NULL) 428 { 429 int copy=1; 430 431 s->ctx->stats.sess_miss++; 432 ret=NULL; 433 if (s->ctx->get_session_cb != NULL 434 && (ret=s->ctx->get_session_cb(s,session_id,len,©)) 435 != NULL) 436 { 437 s->ctx->stats.sess_cb_hit++; 438 439 /* Increment reference count now if the session callback 440 * asks us to do so (note that if the session structures 441 * returned by the callback are shared between threads, 442 * it must handle the reference count itself [i.e. copy == 0], 443 * or things won't be thread-safe). */ 444 if (copy) 445 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 446 447 /* Add the externally cached session to the internal 448 * cache as well if and only if we are supposed to. */ 449 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 450 /* The following should not return 1, otherwise, 451 * things are very strange */ 452 SSL_CTX_add_session(s->ctx,ret); 453 } 454 if (ret == NULL) 455 goto err; 456 } 457 458 /* Now ret is non-NULL, and we own one of its reference counts. */ 459 460 if (ret->sid_ctx_length != s->sid_ctx_length 461 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length)) 462 { 463 /* We've found the session named by the client, but we don't 464 * want to use it in this context. */ 465 466#if 0 /* The client cannot always know when a session is not appropriate, 467 * so we shouldn't generate an error message. */ 468 469 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 470#endif 471 goto err; /* treat like cache miss */ 472 } 473 474 if((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) 475 { 476 /* We can't be sure if this session is being used out of 477 * context, which is especially important for SSL_VERIFY_PEER. 478 * The application should have used SSL[_CTX]_set_session_id_context. 479 * 480 * For this error case, we generate an error instead of treating 481 * the event like a cache miss (otherwise it would be easy for 482 * applications to effectively disable the session cache by 483 * accident without anyone noticing). 484 */ 485 486 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 487 fatal = 1; 488 goto err; 489 } 490 491 if (ret->cipher == NULL) 492 { 493 unsigned char buf[5],*p; 494 unsigned long l; 495 496 p=buf; 497 l=ret->cipher_id; 498 l2n(l,p); 499 if ((ret->ssl_version>>8) >= SSL3_VERSION_MAJOR) 500 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 501 else 502 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 503 if (ret->cipher == NULL) 504 goto err; 505 } 506 507 508#if 0 /* This is way too late. */ 509 510 /* If a thread got the session, then 'swaped', and another got 511 * it and then due to a time-out decided to 'OPENSSL_free' it we could 512 * be in trouble. So I'll increment it now, then double decrement 513 * later - am I speaking rubbish?. */ 514 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 515#endif 516 517 if (ret->timeout < (long)(time(NULL) - ret->time)) /* timeout */ 518 { 519 s->ctx->stats.sess_timeout++; 520 /* remove it from the cache */ 521 SSL_CTX_remove_session(s->ctx,ret); 522 goto err; 523 } 524 525 s->ctx->stats.sess_hit++; 526 527 /* ret->time=time(NULL); */ /* rezero timeout? */ 528 /* again, just leave the session 529 * if it is the same session, we have just incremented and 530 * then decremented the reference count :-) */ 531 if (s->session != NULL) 532 SSL_SESSION_free(s->session); 533 s->session=ret; 534 s->verify_result = s->session->verify_result; 535 return(1); 536 537 err: 538 if (ret != NULL) 539 SSL_SESSION_free(ret); 540 if (fatal) 541 return -1; 542 else 543 return 0; 544 } 545 546int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 547 { 548 int ret=0; 549 SSL_SESSION *s; 550 551 /* add just 1 reference count for the SSL_CTX's session cache 552 * even though it has two ways of access: each session is in a 553 * doubly linked list and an lhash */ 554 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 555 /* if session c is in already in cache, we take back the increment later */ 556 557 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 558 s=(SSL_SESSION *)lh_insert(ctx->sessions,c); 559 560 /* s != NULL iff we already had a session with the given PID. 561 * In this case, s == c should hold (then we did not really modify 562 * ctx->sessions), or we're in trouble. */ 563 if (s != NULL && s != c) 564 { 565 /* We *are* in trouble ... */ 566 SSL_SESSION_list_remove(ctx,s); 567 SSL_SESSION_free(s); 568 /* ... so pretend the other session did not exist in cache 569 * (we cannot handle two SSL_SESSION structures with identical 570 * session ID in the same cache, which could happen e.g. when 571 * two threads concurrently obtain the same session from an external 572 * cache) */ 573 s = NULL; 574 } 575 576 /* Put at the head of the queue unless it is already in the cache */ 577 if (s == NULL) 578 SSL_SESSION_list_add(ctx,c); 579 580 if (s != NULL) 581 { 582 /* existing cache entry -- decrement previously incremented reference 583 * count because it already takes into account the cache */ 584 585 SSL_SESSION_free(s); /* s == c */ 586 ret=0; 587 } 588 else 589 { 590 /* new cache entry -- remove old ones if cache has become too large */ 591 592 ret=1; 593 594 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 595 { 596 while (SSL_CTX_sess_number(ctx) > 597 SSL_CTX_sess_get_cache_size(ctx)) 598 { 599 if (!remove_session_lock(ctx, 600 ctx->session_cache_tail, 0)) 601 break; 602 else 603 ctx->stats.sess_cache_full++; 604 } 605 } 606 } 607 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 608 return(ret); 609 } 610 611int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 612{ 613 return remove_session_lock(ctx, c, 1); 614} 615 616static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 617 { 618 SSL_SESSION *r; 619 int ret=0; 620 621 if ((c != NULL) && (c->session_id_length != 0)) 622 { 623 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 624 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c) 625 { 626 ret=1; 627 r=(SSL_SESSION *)lh_delete(ctx->sessions,c); 628 SSL_SESSION_list_remove(ctx,c); 629 } 630 631 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 632 633 if (ret) 634 { 635 r->not_resumable=1; 636 if (ctx->remove_session_cb != NULL) 637 ctx->remove_session_cb(ctx,r); 638 SSL_SESSION_free(r); 639 } 640 } 641 else 642 ret=0; 643 return(ret); 644 } 645 646void SSL_SESSION_free(SSL_SESSION *ss) 647 { 648 int i; 649 650 if(ss == NULL) 651 return; 652 653 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 654#ifdef REF_PRINT 655 REF_PRINT("SSL_SESSION",ss); 656#endif 657 if (i > 0) return; 658#ifdef REF_CHECK 659 if (i < 0) 660 { 661 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 662 abort(); /* ok */ 663 } 664#endif 665 666 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 667 668 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 669 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 670 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 671 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 672 if (ss->peer != NULL) X509_free(ss->peer); 673 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 674#ifndef OPENSSL_NO_TLSEXT 675 if (ss->tlsext_hostname != NULL) OPENSSL_free(ss->tlsext_hostname); 676 if (ss->tlsext_tick != NULL) OPENSSL_free(ss->tlsext_tick); 677#endif 678 OPENSSL_cleanse(ss,sizeof(*ss)); 679 OPENSSL_free(ss); 680 } 681 682int SSL_set_session(SSL *s, SSL_SESSION *session) 683 { 684 int ret=0; 685 SSL_METHOD *meth; 686 687 if (session != NULL) 688 { 689 meth=s->ctx->method->get_ssl_method(session->ssl_version); 690 if (meth == NULL) 691 meth=s->method->get_ssl_method(session->ssl_version); 692 if (meth == NULL) 693 { 694 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 695 return(0); 696 } 697 698 if (meth != s->method) 699 { 700 if (!SSL_set_ssl_method(s,meth)) 701 return(0); 702 if (s->ctx->session_timeout == 0) 703 session->timeout=SSL_get_default_timeout(s); 704 else 705 session->timeout=s->ctx->session_timeout; 706 } 707 708#ifndef OPENSSL_NO_KRB5 709 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 710 session->krb5_client_princ_len > 0) 711 { 712 s->kssl_ctx->client_princ = (char *)OPENSSL_malloc(session->krb5_client_princ_len + 1); 713 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 714 session->krb5_client_princ_len); 715 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 716 } 717#endif /* OPENSSL_NO_KRB5 */ 718 719 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 720 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 721 if (s->session != NULL) 722 SSL_SESSION_free(s->session); 723 s->session=session; 724 s->verify_result = s->session->verify_result; 725 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 726 ret=1; 727 } 728 else 729 { 730 if (s->session != NULL) 731 { 732 SSL_SESSION_free(s->session); 733 s->session=NULL; 734 } 735 736 meth=s->ctx->method; 737 if (meth != s->method) 738 { 739 if (!SSL_set_ssl_method(s,meth)) 740 return(0); 741 } 742 ret=1; 743 } 744 return(ret); 745 } 746 747long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 748 { 749 if (s == NULL) return(0); 750 s->timeout=t; 751 return(1); 752 } 753 754long SSL_SESSION_get_timeout(const SSL_SESSION *s) 755 { 756 if (s == NULL) return(0); 757 return(s->timeout); 758 } 759 760long SSL_SESSION_get_time(const SSL_SESSION *s) 761 { 762 if (s == NULL) return(0); 763 return(s->time); 764 } 765 766long SSL_SESSION_set_time(SSL_SESSION *s, long t) 767 { 768 if (s == NULL) return(0); 769 s->time=t; 770 return(t); 771 } 772 773long SSL_CTX_set_timeout(SSL_CTX *s, long t) 774 { 775 long l; 776 if (s == NULL) return(0); 777 l=s->session_timeout; 778 s->session_timeout=t; 779 return(l); 780 } 781 782long SSL_CTX_get_timeout(const SSL_CTX *s) 783 { 784 if (s == NULL) return(0); 785 return(s->session_timeout); 786 } 787 788typedef struct timeout_param_st 789 { 790 SSL_CTX *ctx; 791 long time; 792 LHASH *cache; 793 } TIMEOUT_PARAM; 794 795static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p) 796 { 797 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 798 { 799 /* The reason we don't call SSL_CTX_remove_session() is to 800 * save on locking overhead */ 801 lh_delete(p->cache,s); 802 SSL_SESSION_list_remove(p->ctx,s); 803 s->not_resumable=1; 804 if (p->ctx->remove_session_cb != NULL) 805 p->ctx->remove_session_cb(p->ctx,s); 806 SSL_SESSION_free(s); 807 } 808 } 809 810static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *) 811 812void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 813 { 814 unsigned long i; 815 TIMEOUT_PARAM tp; 816 817 tp.ctx=s; 818 tp.cache=s->sessions; 819 if (tp.cache == NULL) return; 820 tp.time=t; 821 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 822 i=tp.cache->down_load; 823 tp.cache->down_load=0; 824 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp); 825 tp.cache->down_load=i; 826 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 827 } 828 829int ssl_clear_bad_session(SSL *s) 830 { 831 if ( (s->session != NULL) && 832 !(s->shutdown & SSL_SENT_SHUTDOWN) && 833 !(SSL_in_init(s) || SSL_in_before(s))) 834 { 835 SSL_CTX_remove_session(s->ctx,s->session); 836 return(1); 837 } 838 else 839 return(0); 840 } 841 842/* locked by SSL_CTX in the calling function */ 843static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 844 { 845 if ((s->next == NULL) || (s->prev == NULL)) return; 846 847 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 848 { /* last element in list */ 849 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 850 { /* only one element in list */ 851 ctx->session_cache_head=NULL; 852 ctx->session_cache_tail=NULL; 853 } 854 else 855 { 856 ctx->session_cache_tail=s->prev; 857 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 858 } 859 } 860 else 861 { 862 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 863 { /* first element in list */ 864 ctx->session_cache_head=s->next; 865 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 866 } 867 else 868 { /* middle of list */ 869 s->next->prev=s->prev; 870 s->prev->next=s->next; 871 } 872 } 873 s->prev=s->next=NULL; 874 } 875 876static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 877 { 878 if ((s->next != NULL) && (s->prev != NULL)) 879 SSL_SESSION_list_remove(ctx,s); 880 881 if (ctx->session_cache_head == NULL) 882 { 883 ctx->session_cache_head=s; 884 ctx->session_cache_tail=s; 885 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 886 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 887 } 888 else 889 { 890 s->next=ctx->session_cache_head; 891 s->next->prev=s; 892 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 893 ctx->session_cache_head=s; 894 } 895 } 896 897void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, 898 int (*cb)(struct ssl_st *ssl,SSL_SESSION *sess)) 899 { 900 ctx->new_session_cb=cb; 901 } 902 903int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(SSL *ssl, SSL_SESSION *sess) 904 { 905 return ctx->new_session_cb; 906 } 907 908void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, 909 void (*cb)(SSL_CTX *ctx,SSL_SESSION *sess)) 910 { 911 ctx->remove_session_cb=cb; 912 } 913 914void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(SSL_CTX * ctx,SSL_SESSION *sess) 915 { 916 return ctx->remove_session_cb; 917 } 918 919void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, 920 SSL_SESSION *(*cb)(struct ssl_st *ssl, 921 unsigned char *data,int len,int *copy)) 922 { 923 ctx->get_session_cb=cb; 924 } 925 926SSL_SESSION * (*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, 927 unsigned char *data,int len,int *copy) 928 { 929 return ctx->get_session_cb; 930 } 931 932void SSL_CTX_set_info_callback(SSL_CTX *ctx, 933 void (*cb)(const SSL *ssl,int type,int val)) 934 { 935 ctx->info_callback=cb; 936 } 937 938void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))(const SSL *ssl,int type,int val) 939 { 940 return ctx->info_callback; 941 } 942 943void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, 944 int (*cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey)) 945 { 946 ctx->client_cert_cb=cb; 947 } 948 949int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL * ssl, X509 ** x509 , EVP_PKEY **pkey) 950 { 951 return ctx->client_cert_cb; 952 } 953 954#ifndef OPENSSL_NO_ENGINE 955int SSL_CTX_set_client_cert_engine(SSL_CTX *ctx, ENGINE *e) 956 { 957 if (!ENGINE_init(e)) 958 { 959 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, ERR_R_ENGINE_LIB); 960 return 0; 961 } 962 if(!ENGINE_get_ssl_client_cert_function(e)) 963 { 964 SSLerr(SSL_F_SSL_CTX_SET_CLIENT_CERT_ENGINE, SSL_R_NO_CLIENT_CERT_METHOD); 965 ENGINE_finish(e); 966 return 0; 967 } 968 ctx->client_cert_engine = e; 969 return 1; 970 } 971#endif 972 973void SSL_CTX_set_cookie_generate_cb(SSL_CTX *ctx, 974 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int *cookie_len)) 975 { 976 ctx->app_gen_cookie_cb=cb; 977 } 978 979void SSL_CTX_set_cookie_verify_cb(SSL_CTX *ctx, 980 int (*cb)(SSL *ssl, unsigned char *cookie, unsigned int cookie_len)) 981 { 982 ctx->app_verify_cookie_cb=cb; 983 } 984 985