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#include "ssl_locl.h" 63 64static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s); 65static void SSL_SESSION_list_add(SSL_CTX *ctx,SSL_SESSION *s); 66static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck); 67 68SSL_SESSION *SSL_get_session(SSL *ssl) 69/* aka SSL_get0_session; gets 0 objects, just returns a copy of the pointer */ 70 { 71 return(ssl->session); 72 } 73 74SSL_SESSION *SSL_get1_session(SSL *ssl) 75/* variant of SSL_get_session: caller really gets something */ 76 { 77 SSL_SESSION *sess; 78 /* Need to lock this all up rather than just use CRYPTO_add so that 79 * somebody doesn't free ssl->session between when we check it's 80 * non-null and when we up the reference count. */ 81 CRYPTO_w_lock(CRYPTO_LOCK_SSL_SESSION); 82 sess = ssl->session; 83 if(sess) 84 sess->references++; 85 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_SESSION); 86 return(sess); 87 } 88 89int SSL_SESSION_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 90 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 91 { 92 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_SSL_SESSION, argl, argp, 93 new_func, dup_func, free_func); 94 } 95 96int SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, void *arg) 97 { 98 return(CRYPTO_set_ex_data(&s->ex_data,idx,arg)); 99 } 100 101void *SSL_SESSION_get_ex_data(SSL_SESSION *s, int idx) 102 { 103 return(CRYPTO_get_ex_data(&s->ex_data,idx)); 104 } 105 106SSL_SESSION *SSL_SESSION_new(void) 107 { 108 SSL_SESSION *ss; 109 110 ss=(SSL_SESSION *)OPENSSL_malloc(sizeof(SSL_SESSION)); 111 if (ss == NULL) 112 { 113 SSLerr(SSL_F_SSL_SESSION_NEW,ERR_R_MALLOC_FAILURE); 114 return(0); 115 } 116 memset(ss,0,sizeof(SSL_SESSION)); 117 118 ss->verify_result = 1; /* avoid 0 (= X509_V_OK) just in case */ 119 ss->references=1; 120 ss->timeout=60*5+4; /* 5 minute timeout by default */ 121 ss->time=time(NULL); 122 ss->prev=NULL; 123 ss->next=NULL; 124 ss->compress_meth=0; 125 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 126 return(ss); 127 } 128 129/* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1 130 * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly 131 * until we have no conflict is going to complete in one iteration pretty much 132 * "most" of the time (btw: understatement). So, if it takes us 10 iterations 133 * and we still can't avoid a conflict - well that's a reasonable point to call 134 * it quits. Either the RAND code is broken or someone is trying to open roughly 135 * very close to 2^128 (or 2^256) SSL sessions to our server. How you might 136 * store that many sessions is perhaps a more interesting question ... */ 137 138#define MAX_SESS_ID_ATTEMPTS 10 139static int def_generate_session_id(const SSL *ssl, unsigned char *id, 140 unsigned int *id_len) 141{ 142 unsigned int retry = 0; 143 do 144 if(RAND_pseudo_bytes(id, *id_len) <= 0) 145 return 0; 146 while(SSL_has_matching_session_id(ssl, id, *id_len) && 147 (++retry < MAX_SESS_ID_ATTEMPTS)); 148 if(retry < MAX_SESS_ID_ATTEMPTS) 149 return 1; 150 /* else - woops a session_id match */ 151 /* XXX We should also check the external cache -- 152 * but the probability of a collision is negligible, and 153 * we could not prevent the concurrent creation of sessions 154 * with identical IDs since we currently don't have means 155 * to atomically check whether a session ID already exists 156 * and make a reservation for it if it does not 157 * (this problem applies to the internal cache as well). 158 */ 159 return 0; 160} 161 162int ssl_get_new_session(SSL *s, int session) 163 { 164 /* This gets used by clients and servers. */ 165 166 unsigned int tmp; 167 SSL_SESSION *ss=NULL; 168 GEN_SESSION_CB cb = def_generate_session_id; 169 170 if ((ss=SSL_SESSION_new()) == NULL) return(0); 171 172 /* If the context has a default timeout, use it */ 173 if (s->ctx->session_timeout == 0) 174 ss->timeout=SSL_get_default_timeout(s); 175 else 176 ss->timeout=s->ctx->session_timeout; 177 178 if (s->session != NULL) 179 { 180 SSL_SESSION_free(s->session); 181 s->session=NULL; 182 } 183 184 if (session) 185 { 186 if (s->version == SSL2_VERSION) 187 { 188 ss->ssl_version=SSL2_VERSION; 189 ss->session_id_length=SSL2_SSL_SESSION_ID_LENGTH; 190 } 191 else if (s->version == SSL3_VERSION) 192 { 193 ss->ssl_version=SSL3_VERSION; 194 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 195 } 196 else if (s->version == TLS1_VERSION) 197 { 198 ss->ssl_version=TLS1_VERSION; 199 ss->session_id_length=SSL3_SSL_SESSION_ID_LENGTH; 200 } 201 else 202 { 203 SSLerr(SSL_F_SSL_GET_NEW_SESSION,SSL_R_UNSUPPORTED_SSL_VERSION); 204 SSL_SESSION_free(ss); 205 return(0); 206 } 207 /* Choose which callback will set the session ID */ 208 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 209 if(s->generate_session_id) 210 cb = s->generate_session_id; 211 else if(s->ctx->generate_session_id) 212 cb = s->ctx->generate_session_id; 213 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 214 /* Choose a session ID */ 215 tmp = ss->session_id_length; 216 if(!cb(s, ss->session_id, &tmp)) 217 { 218 /* The callback failed */ 219 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 220 SSL_R_SSL_SESSION_ID_CALLBACK_FAILED); 221 SSL_SESSION_free(ss); 222 return(0); 223 } 224 /* Don't allow the callback to set the session length to zero. 225 * nor set it higher than it was. */ 226 if(!tmp || (tmp > ss->session_id_length)) 227 { 228 /* The callback set an illegal length */ 229 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 230 SSL_R_SSL_SESSION_ID_HAS_BAD_LENGTH); 231 SSL_SESSION_free(ss); 232 return(0); 233 } 234 /* If the session length was shrunk and we're SSLv2, pad it */ 235 if((tmp < ss->session_id_length) && (s->version == SSL2_VERSION)) 236 memset(ss->session_id + tmp, 0, ss->session_id_length - tmp); 237 else 238 ss->session_id_length = tmp; 239 /* Finally, check for a conflict */ 240 if(SSL_has_matching_session_id(s, ss->session_id, 241 ss->session_id_length)) 242 { 243 SSLerr(SSL_F_SSL_GET_NEW_SESSION, 244 SSL_R_SSL_SESSION_ID_CONFLICT); 245 SSL_SESSION_free(ss); 246 return(0); 247 } 248 } 249 else 250 { 251 ss->session_id_length=0; 252 } 253 254 if (s->sid_ctx_length > sizeof ss->sid_ctx) 255 { 256 SSLerr(SSL_F_SSL_GET_NEW_SESSION, ERR_R_INTERNAL_ERROR); 257 SSL_SESSION_free(ss); 258 return 0; 259 } 260 memcpy(ss->sid_ctx,s->sid_ctx,s->sid_ctx_length); 261 ss->sid_ctx_length=s->sid_ctx_length; 262 s->session=ss; 263 ss->ssl_version=s->version; 264 ss->verify_result = X509_V_OK; 265 266 return(1); 267 } 268 269int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len) 270 { 271 /* This is used only by servers. */ 272 273 SSL_SESSION *ret=NULL,data; 274 int fatal = 0; 275 276 data.ssl_version=s->version; 277 data.session_id_length=len; 278 if (len > SSL_MAX_SSL_SESSION_ID_LENGTH) 279 goto err; 280 memcpy(data.session_id,session_id,len); 281 282 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) 283 { 284 CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX); 285 ret=(SSL_SESSION *)lh_retrieve(s->ctx->sessions,&data); 286 if (ret != NULL) 287 /* don't allow other threads to steal it: */ 288 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 289 CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX); 290 } 291 292 if (ret == NULL) 293 { 294 int copy=1; 295 296 s->ctx->stats.sess_miss++; 297 ret=NULL; 298 if (s->ctx->get_session_cb != NULL 299 && (ret=s->ctx->get_session_cb(s,session_id,len,©)) 300 != NULL) 301 { 302 s->ctx->stats.sess_cb_hit++; 303 304 /* Increment reference count now if the session callback 305 * asks us to do so (note that if the session structures 306 * returned by the callback are shared between threads, 307 * it must handle the reference count itself [i.e. copy == 0], 308 * or things won't be thread-safe). */ 309 if (copy) 310 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 311 312 /* Add the externally cached session to the internal 313 * cache as well if and only if we are supposed to. */ 314 if(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_NO_INTERNAL_STORE)) 315 /* The following should not return 1, otherwise, 316 * things are very strange */ 317 SSL_CTX_add_session(s->ctx,ret); 318 } 319 if (ret == NULL) 320 goto err; 321 } 322 323 /* Now ret is non-NULL, and we own one of its reference counts. */ 324 325 if((s->verify_mode&SSL_VERIFY_PEER) 326 && (!s->sid_ctx_length || ret->sid_ctx_length != s->sid_ctx_length 327 || memcmp(ret->sid_ctx,s->sid_ctx,ret->sid_ctx_length))) 328 { 329 /* We've found the session named by the client, but we don't 330 * want to use it in this context. */ 331 332 if (s->sid_ctx_length == 0) 333 { 334 /* application should have used SSL[_CTX]_set_session_id_context 335 * -- we could tolerate this and just pretend we never heard 336 * of this session, but then applications could effectively 337 * disable the session cache by accident without anyone noticing */ 338 339 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED); 340 fatal = 1; 341 goto err; 342 } 343 else 344 { 345#if 0 /* The client cannot always know when a session is not appropriate, 346 * so we shouldn't generate an error message. */ 347 348 SSLerr(SSL_F_SSL_GET_PREV_SESSION,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 349#endif 350 goto err; /* treat like cache miss */ 351 } 352 } 353 354 if (ret->cipher == NULL) 355 { 356 unsigned char buf[5],*p; 357 unsigned long l; 358 359 p=buf; 360 l=ret->cipher_id; 361 l2n(l,p); 362 if ((ret->ssl_version>>8) == SSL3_VERSION_MAJOR) 363 ret->cipher=ssl_get_cipher_by_char(s,&(buf[2])); 364 else 365 ret->cipher=ssl_get_cipher_by_char(s,&(buf[1])); 366 if (ret->cipher == NULL) 367 goto err; 368 } 369 370 371#if 0 /* This is way too late. */ 372 373 /* If a thread got the session, then 'swaped', and another got 374 * it and then due to a time-out decided to 'OPENSSL_free' it we could 375 * be in trouble. So I'll increment it now, then double decrement 376 * later - am I speaking rubbish?. */ 377 CRYPTO_add(&ret->references,1,CRYPTO_LOCK_SSL_SESSION); 378#endif 379 380 if ((long)(ret->time+ret->timeout) < (long)time(NULL)) /* timeout */ 381 { 382 s->ctx->stats.sess_timeout++; 383 /* remove it from the cache */ 384 SSL_CTX_remove_session(s->ctx,ret); 385 goto err; 386 } 387 388 s->ctx->stats.sess_hit++; 389 390 /* ret->time=time(NULL); */ /* rezero timeout? */ 391 /* again, just leave the session 392 * if it is the same session, we have just incremented and 393 * then decremented the reference count :-) */ 394 if (s->session != NULL) 395 SSL_SESSION_free(s->session); 396 s->session=ret; 397 s->verify_result = s->session->verify_result; 398 return(1); 399 400 err: 401 if (ret != NULL) 402 SSL_SESSION_free(ret); 403 if (fatal) 404 return -1; 405 else 406 return 0; 407 } 408 409int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) 410 { 411 int ret=0; 412 SSL_SESSION *s; 413 414 /* add just 1 reference count for the SSL_CTX's session cache 415 * even though it has two ways of access: each session is in a 416 * doubly linked list and an lhash */ 417 CRYPTO_add(&c->references,1,CRYPTO_LOCK_SSL_SESSION); 418 /* if session c is in already in cache, we take back the increment later */ 419 420 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 421 s=(SSL_SESSION *)lh_insert(ctx->sessions,c); 422 423 /* s != NULL iff we already had a session with the given PID. 424 * In this case, s == c should hold (then we did not really modify 425 * ctx->sessions), or we're in trouble. */ 426 if (s != NULL && s != c) 427 { 428 /* We *are* in trouble ... */ 429 SSL_SESSION_list_remove(ctx,s); 430 SSL_SESSION_free(s); 431 /* ... so pretend the other session did not exist in cache 432 * (we cannot handle two SSL_SESSION structures with identical 433 * session ID in the same cache, which could happen e.g. when 434 * two threads concurrently obtain the same session from an external 435 * cache) */ 436 s = NULL; 437 } 438 439 /* Put at the head of the queue unless it is already in the cache */ 440 if (s == NULL) 441 SSL_SESSION_list_add(ctx,c); 442 443 if (s != NULL) 444 { 445 /* existing cache entry -- decrement previously incremented reference 446 * count because it already takes into account the cache */ 447 448 SSL_SESSION_free(s); /* s == c */ 449 ret=0; 450 } 451 else 452 { 453 /* new cache entry -- remove old ones if cache has become too large */ 454 455 ret=1; 456 457 if (SSL_CTX_sess_get_cache_size(ctx) > 0) 458 { 459 while (SSL_CTX_sess_number(ctx) > 460 SSL_CTX_sess_get_cache_size(ctx)) 461 { 462 if (!remove_session_lock(ctx, 463 ctx->session_cache_tail, 0)) 464 break; 465 else 466 ctx->stats.sess_cache_full++; 467 } 468 } 469 } 470 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 471 return(ret); 472 } 473 474int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c) 475{ 476 return remove_session_lock(ctx, c, 1); 477} 478 479static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck) 480 { 481 SSL_SESSION *r; 482 int ret=0; 483 484 if ((c != NULL) && (c->session_id_length != 0)) 485 { 486 if(lck) CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 487 if ((r = (SSL_SESSION *)lh_retrieve(ctx->sessions,c)) == c) 488 { 489 ret=1; 490 r=(SSL_SESSION *)lh_delete(ctx->sessions,c); 491 SSL_SESSION_list_remove(ctx,c); 492 } 493 494 if(lck) CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 495 496 if (ret) 497 { 498 r->not_resumable=1; 499 if (ctx->remove_session_cb != NULL) 500 ctx->remove_session_cb(ctx,r); 501 SSL_SESSION_free(r); 502 } 503 } 504 else 505 ret=0; 506 return(ret); 507 } 508 509void SSL_SESSION_free(SSL_SESSION *ss) 510 { 511 int i; 512 513 if(ss == NULL) 514 return; 515 516 i=CRYPTO_add(&ss->references,-1,CRYPTO_LOCK_SSL_SESSION); 517#ifdef REF_PRINT 518 REF_PRINT("SSL_SESSION",ss); 519#endif 520 if (i > 0) return; 521#ifdef REF_CHECK 522 if (i < 0) 523 { 524 fprintf(stderr,"SSL_SESSION_free, bad reference count\n"); 525 abort(); /* ok */ 526 } 527#endif 528 529 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL_SESSION, ss, &ss->ex_data); 530 531 OPENSSL_cleanse(ss->key_arg,sizeof ss->key_arg); 532 OPENSSL_cleanse(ss->master_key,sizeof ss->master_key); 533 OPENSSL_cleanse(ss->session_id,sizeof ss->session_id); 534 if (ss->sess_cert != NULL) ssl_sess_cert_free(ss->sess_cert); 535 if (ss->peer != NULL) X509_free(ss->peer); 536 if (ss->ciphers != NULL) sk_SSL_CIPHER_free(ss->ciphers); 537 OPENSSL_cleanse(ss,sizeof(*ss)); 538 OPENSSL_free(ss); 539 } 540 541int SSL_set_session(SSL *s, SSL_SESSION *session) 542 { 543 int ret=0; 544 SSL_METHOD *meth; 545 546 if (session != NULL) 547 { 548 meth=s->ctx->method->get_ssl_method(session->ssl_version); 549 if (meth == NULL) 550 meth=s->method->get_ssl_method(session->ssl_version); 551 if (meth == NULL) 552 { 553 SSLerr(SSL_F_SSL_SET_SESSION,SSL_R_UNABLE_TO_FIND_SSL_METHOD); 554 return(0); 555 } 556 557 if (meth != s->method) 558 { 559 if (!SSL_set_ssl_method(s,meth)) 560 return(0); 561 if (s->ctx->session_timeout == 0) 562 session->timeout=SSL_get_default_timeout(s); 563 else 564 session->timeout=s->ctx->session_timeout; 565 } 566 567#ifndef OPENSSL_NO_KRB5 568 if (s->kssl_ctx && !s->kssl_ctx->client_princ && 569 session->krb5_client_princ_len > 0) 570 { 571 s->kssl_ctx->client_princ = (char *)malloc(session->krb5_client_princ_len + 1); 572 memcpy(s->kssl_ctx->client_princ,session->krb5_client_princ, 573 session->krb5_client_princ_len); 574 s->kssl_ctx->client_princ[session->krb5_client_princ_len] = '\0'; 575 } 576#endif /* OPENSSL_NO_KRB5 */ 577 578 /* CRYPTO_w_lock(CRYPTO_LOCK_SSL);*/ 579 CRYPTO_add(&session->references,1,CRYPTO_LOCK_SSL_SESSION); 580 if (s->session != NULL) 581 SSL_SESSION_free(s->session); 582 s->session=session; 583 s->verify_result = s->session->verify_result; 584 /* CRYPTO_w_unlock(CRYPTO_LOCK_SSL);*/ 585 ret=1; 586 } 587 else 588 { 589 if (s->session != NULL) 590 { 591 SSL_SESSION_free(s->session); 592 s->session=NULL; 593 } 594 595 meth=s->ctx->method; 596 if (meth != s->method) 597 { 598 if (!SSL_set_ssl_method(s,meth)) 599 return(0); 600 } 601 ret=1; 602 } 603 return(ret); 604 } 605 606long SSL_SESSION_set_timeout(SSL_SESSION *s, long t) 607 { 608 if (s == NULL) return(0); 609 s->timeout=t; 610 return(1); 611 } 612 613long SSL_SESSION_get_timeout(SSL_SESSION *s) 614 { 615 if (s == NULL) return(0); 616 return(s->timeout); 617 } 618 619long SSL_SESSION_get_time(SSL_SESSION *s) 620 { 621 if (s == NULL) return(0); 622 return(s->time); 623 } 624 625long SSL_SESSION_set_time(SSL_SESSION *s, long t) 626 { 627 if (s == NULL) return(0); 628 s->time=t; 629 return(t); 630 } 631 632long SSL_CTX_set_timeout(SSL_CTX *s, long t) 633 { 634 long l; 635 if (s == NULL) return(0); 636 l=s->session_timeout; 637 s->session_timeout=t; 638 return(l); 639 } 640 641long SSL_CTX_get_timeout(SSL_CTX *s) 642 { 643 if (s == NULL) return(0); 644 return(s->session_timeout); 645 } 646 647typedef struct timeout_param_st 648 { 649 SSL_CTX *ctx; 650 long time; 651 LHASH *cache; 652 } TIMEOUT_PARAM; 653 654static void timeout(SSL_SESSION *s, TIMEOUT_PARAM *p) 655 { 656 if ((p->time == 0) || (p->time > (s->time+s->timeout))) /* timeout */ 657 { 658 /* The reason we don't call SSL_CTX_remove_session() is to 659 * save on locking overhead */ 660 lh_delete(p->cache,s); 661 SSL_SESSION_list_remove(p->ctx,s); 662 s->not_resumable=1; 663 if (p->ctx->remove_session_cb != NULL) 664 p->ctx->remove_session_cb(p->ctx,s); 665 SSL_SESSION_free(s); 666 } 667 } 668 669static IMPLEMENT_LHASH_DOALL_ARG_FN(timeout, SSL_SESSION *, TIMEOUT_PARAM *) 670 671void SSL_CTX_flush_sessions(SSL_CTX *s, long t) 672 { 673 unsigned long i; 674 TIMEOUT_PARAM tp; 675 676 tp.ctx=s; 677 tp.cache=s->sessions; 678 if (tp.cache == NULL) return; 679 tp.time=t; 680 CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX); 681 i=tp.cache->down_load; 682 tp.cache->down_load=0; 683 lh_doall_arg(tp.cache, LHASH_DOALL_ARG_FN(timeout), &tp); 684 tp.cache->down_load=i; 685 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX); 686 } 687 688int ssl_clear_bad_session(SSL *s) 689 { 690 if ( (s->session != NULL) && 691 !(s->shutdown & SSL_SENT_SHUTDOWN) && 692 !(SSL_in_init(s) || SSL_in_before(s))) 693 { 694 SSL_CTX_remove_session(s->ctx,s->session); 695 return(1); 696 } 697 else 698 return(0); 699 } 700 701/* locked by SSL_CTX in the calling function */ 702static void SSL_SESSION_list_remove(SSL_CTX *ctx, SSL_SESSION *s) 703 { 704 if ((s->next == NULL) || (s->prev == NULL)) return; 705 706 if (s->next == (SSL_SESSION *)&(ctx->session_cache_tail)) 707 { /* last element in list */ 708 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 709 { /* only one element in list */ 710 ctx->session_cache_head=NULL; 711 ctx->session_cache_tail=NULL; 712 } 713 else 714 { 715 ctx->session_cache_tail=s->prev; 716 s->prev->next=(SSL_SESSION *)&(ctx->session_cache_tail); 717 } 718 } 719 else 720 { 721 if (s->prev == (SSL_SESSION *)&(ctx->session_cache_head)) 722 { /* first element in list */ 723 ctx->session_cache_head=s->next; 724 s->next->prev=(SSL_SESSION *)&(ctx->session_cache_head); 725 } 726 else 727 { /* middle of list */ 728 s->next->prev=s->prev; 729 s->prev->next=s->next; 730 } 731 } 732 s->prev=s->next=NULL; 733 } 734 735static void SSL_SESSION_list_add(SSL_CTX *ctx, SSL_SESSION *s) 736 { 737 if ((s->next != NULL) && (s->prev != NULL)) 738 SSL_SESSION_list_remove(ctx,s); 739 740 if (ctx->session_cache_head == NULL) 741 { 742 ctx->session_cache_head=s; 743 ctx->session_cache_tail=s; 744 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 745 s->next=(SSL_SESSION *)&(ctx->session_cache_tail); 746 } 747 else 748 { 749 s->next=ctx->session_cache_head; 750 s->next->prev=s; 751 s->prev=(SSL_SESSION *)&(ctx->session_cache_head); 752 ctx->session_cache_head=s; 753 } 754 } 755 756