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