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