1160814Ssimon/* ssl/d1_lib.c */ 2280297Sjkim/* 3160814Ssimon * DTLS implementation written by Nagendra Modadugu 4280297Sjkim * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5160814Ssimon */ 6160814Ssimon/* ==================================================================== 7160814Ssimon * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. 8160814Ssimon * 9160814Ssimon * Redistribution and use in source and binary forms, with or without 10160814Ssimon * modification, are permitted provided that the following conditions 11160814Ssimon * are met: 12160814Ssimon * 13160814Ssimon * 1. Redistributions of source code must retain the above copyright 14280297Sjkim * notice, this list of conditions and the following disclaimer. 15160814Ssimon * 16160814Ssimon * 2. Redistributions in binary form must reproduce the above copyright 17160814Ssimon * notice, this list of conditions and the following disclaimer in 18160814Ssimon * the documentation and/or other materials provided with the 19160814Ssimon * distribution. 20160814Ssimon * 21160814Ssimon * 3. All advertising materials mentioning features or use of this 22160814Ssimon * software must display the following acknowledgment: 23160814Ssimon * "This product includes software developed by the OpenSSL Project 24160814Ssimon * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25160814Ssimon * 26160814Ssimon * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27160814Ssimon * endorse or promote products derived from this software without 28160814Ssimon * prior written permission. For written permission, please contact 29160814Ssimon * openssl-core@OpenSSL.org. 30160814Ssimon * 31160814Ssimon * 5. Products derived from this software may not be called "OpenSSL" 32160814Ssimon * nor may "OpenSSL" appear in their names without prior written 33160814Ssimon * permission of the OpenSSL Project. 34160814Ssimon * 35160814Ssimon * 6. Redistributions of any form whatsoever must retain the following 36160814Ssimon * acknowledgment: 37160814Ssimon * "This product includes software developed by the OpenSSL Project 38160814Ssimon * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39160814Ssimon * 40160814Ssimon * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41160814Ssimon * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42160814Ssimon * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43160814Ssimon * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44160814Ssimon * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45160814Ssimon * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46160814Ssimon * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47160814Ssimon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48160814Ssimon * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49160814Ssimon * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50160814Ssimon * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51160814Ssimon * OF THE POSSIBILITY OF SUCH DAMAGE. 52160814Ssimon * ==================================================================== 53160814Ssimon * 54160814Ssimon * This product includes cryptographic software written by Eric Young 55160814Ssimon * (eay@cryptsoft.com). This product includes software written by Tim 56160814Ssimon * Hudson (tjh@cryptsoft.com). 57160814Ssimon * 58160814Ssimon */ 59160814Ssimon 60160814Ssimon#include <stdio.h> 61205128Ssimon#define USE_SOCKETS 62160814Ssimon#include <openssl/objects.h> 63160814Ssimon#include "ssl_locl.h" 64160814Ssimon 65290207Sjkim#if defined(OPENSSL_SYS_VMS) 66280297Sjkim# include <sys/timeb.h> 67205128Ssimon#endif 68205128Ssimon 69205128Ssimonstatic void get_current_time(struct timeval *t); 70290207Sjkimstatic void dtls1_set_handshake_header(SSL *s, int type, unsigned long len); 71290207Sjkimstatic int dtls1_handshake_write(SSL *s); 72280297Sjkimconst char dtls1_version_str[] = "DTLSv1" OPENSSL_VERSION_PTEXT; 73205128Ssimonint dtls1_listen(SSL *s, struct sockaddr *client); 74160814Ssimon 75280297SjkimSSL3_ENC_METHOD DTLSv1_enc_data = { 76290207Sjkim tls1_enc, 77280297Sjkim tls1_mac, 78280297Sjkim tls1_setup_key_block, 79280297Sjkim tls1_generate_master_secret, 80280297Sjkim tls1_change_cipher_state, 81280297Sjkim tls1_final_finish_mac, 82280297Sjkim TLS1_FINISH_MAC_LENGTH, 83280297Sjkim tls1_cert_verify_mac, 84280297Sjkim TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, 85280297Sjkim TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, 86280297Sjkim tls1_alert_code, 87280297Sjkim tls1_export_keying_material, 88290207Sjkim SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV, 89290207Sjkim DTLS1_HM_HEADER_LENGTH, 90290207Sjkim dtls1_set_handshake_header, 91290207Sjkim dtls1_handshake_write 92280297Sjkim}; 93160814Ssimon 94290207SjkimSSL3_ENC_METHOD DTLSv1_2_enc_data = { 95290207Sjkim tls1_enc, 96290207Sjkim tls1_mac, 97290207Sjkim tls1_setup_key_block, 98290207Sjkim tls1_generate_master_secret, 99290207Sjkim tls1_change_cipher_state, 100290207Sjkim tls1_final_finish_mac, 101290207Sjkim TLS1_FINISH_MAC_LENGTH, 102290207Sjkim tls1_cert_verify_mac, 103290207Sjkim TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE, 104290207Sjkim TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE, 105290207Sjkim tls1_alert_code, 106290207Sjkim tls1_export_keying_material, 107290207Sjkim SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS 108290207Sjkim | SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS, 109290207Sjkim DTLS1_HM_HEADER_LENGTH, 110290207Sjkim dtls1_set_handshake_header, 111290207Sjkim dtls1_handshake_write 112290207Sjkim}; 113290207Sjkim 114160814Ssimonlong dtls1_default_timeout(void) 115280297Sjkim{ 116280297Sjkim /* 117280297Sjkim * 2 hours, the 24 hours mentioned in the DTLSv1 spec is way too long for 118280297Sjkim * http, the cache would over fill 119280297Sjkim */ 120280297Sjkim return (60 * 60 * 2); 121280297Sjkim} 122160814Ssimon 123160814Ssimonint dtls1_new(SSL *s) 124280297Sjkim{ 125280297Sjkim DTLS1_STATE *d1; 126160814Ssimon 127280297Sjkim if (!ssl3_new(s)) 128280297Sjkim return (0); 129331638Sjkim if ((d1 = OPENSSL_malloc(sizeof(*d1))) == NULL) 130280297Sjkim return (0); 131331638Sjkim memset(d1, 0, sizeof(*d1)); 132160814Ssimon 133280297Sjkim /* d1->handshake_epoch=0; */ 134160814Ssimon 135280297Sjkim d1->unprocessed_rcds.q = pqueue_new(); 136280297Sjkim d1->processed_rcds.q = pqueue_new(); 137280297Sjkim d1->buffered_messages = pqueue_new(); 138280297Sjkim d1->sent_messages = pqueue_new(); 139280297Sjkim d1->buffered_app_data.q = pqueue_new(); 140160814Ssimon 141280297Sjkim if (s->server) { 142280297Sjkim d1->cookie_len = sizeof(s->d1->cookie); 143280297Sjkim } 144160814Ssimon 145280297Sjkim d1->link_mtu = 0; 146280297Sjkim d1->mtu = 0; 147276861Sjkim 148280297Sjkim if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q 149280297Sjkim || !d1->buffered_messages || !d1->sent_messages 150280297Sjkim || !d1->buffered_app_data.q) { 151280297Sjkim if (d1->unprocessed_rcds.q) 152280297Sjkim pqueue_free(d1->unprocessed_rcds.q); 153280297Sjkim if (d1->processed_rcds.q) 154280297Sjkim pqueue_free(d1->processed_rcds.q); 155280297Sjkim if (d1->buffered_messages) 156280297Sjkim pqueue_free(d1->buffered_messages); 157280297Sjkim if (d1->sent_messages) 158280297Sjkim pqueue_free(d1->sent_messages); 159280297Sjkim if (d1->buffered_app_data.q) 160280297Sjkim pqueue_free(d1->buffered_app_data.q); 161280297Sjkim OPENSSL_free(d1); 162280297Sjkim return (0); 163280297Sjkim } 164160814Ssimon 165280297Sjkim s->d1 = d1; 166280297Sjkim s->method->ssl_clear(s); 167280297Sjkim return (1); 168280297Sjkim} 169160814Ssimon 170237657Sjkimstatic void dtls1_clear_queues(SSL *s) 171280297Sjkim{ 172160814Ssimon pitem *item = NULL; 173280297Sjkim DTLS1_RECORD_DATA *rdata; 174160814Ssimon 175280297Sjkim while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) { 176280297Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 177280297Sjkim if (rdata->rbuf.buf) { 178280297Sjkim OPENSSL_free(rdata->rbuf.buf); 179280297Sjkim } 180160814Ssimon OPENSSL_free(item->data); 181160814Ssimon pitem_free(item); 182280297Sjkim } 183280297Sjkim 184280297Sjkim while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) { 185280297Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 186280297Sjkim if (rdata->rbuf.buf) { 187280297Sjkim OPENSSL_free(rdata->rbuf.buf); 188160814Ssimon } 189160814Ssimon OPENSSL_free(item->data); 190160814Ssimon pitem_free(item); 191280297Sjkim } 192160814Ssimon 193306195Sjkim while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) { 194306195Sjkim rdata = (DTLS1_RECORD_DATA *)item->data; 195306195Sjkim if (rdata->rbuf.buf) { 196306195Sjkim OPENSSL_free(rdata->rbuf.buf); 197306195Sjkim } 198306195Sjkim OPENSSL_free(item->data); 199306195Sjkim pitem_free(item); 200306195Sjkim } 201306195Sjkim 202306195Sjkim dtls1_clear_received_buffer(s); 203306195Sjkim dtls1_clear_sent_buffer(s); 204306195Sjkim} 205306195Sjkim 206306195Sjkimvoid dtls1_clear_received_buffer(SSL *s) 207306195Sjkim{ 208306195Sjkim pitem *item = NULL; 209306195Sjkim hm_fragment *frag = NULL; 210306195Sjkim 211280297Sjkim while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) { 212160814Ssimon frag = (hm_fragment *)item->data; 213276861Sjkim dtls1_hm_fragment_free(frag); 214160814Ssimon pitem_free(item); 215280297Sjkim } 216306195Sjkim} 217160814Ssimon 218306195Sjkimvoid dtls1_clear_sent_buffer(SSL *s) 219306195Sjkim{ 220306195Sjkim pitem *item = NULL; 221306195Sjkim hm_fragment *frag = NULL; 222306195Sjkim 223280297Sjkim while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) { 224160814Ssimon frag = (hm_fragment *)item->data; 225276861Sjkim dtls1_hm_fragment_free(frag); 226160814Ssimon pitem_free(item); 227280297Sjkim } 228280297Sjkim} 229160814Ssimon 230306195Sjkim 231237657Sjkimvoid dtls1_free(SSL *s) 232280297Sjkim{ 233280297Sjkim ssl3_free(s); 234237657Sjkim 235280297Sjkim dtls1_clear_queues(s); 236237657Sjkim 237237657Sjkim pqueue_free(s->d1->unprocessed_rcds.q); 238237657Sjkim pqueue_free(s->d1->processed_rcds.q); 239237657Sjkim pqueue_free(s->d1->buffered_messages); 240280297Sjkim pqueue_free(s->d1->sent_messages); 241280297Sjkim pqueue_free(s->d1->buffered_app_data.q); 242160814Ssimon 243280297Sjkim OPENSSL_free(s->d1); 244280297Sjkim s->d1 = NULL; 245280297Sjkim} 246160814Ssimon 247160814Ssimonvoid dtls1_clear(SSL *s) 248280297Sjkim{ 249237657Sjkim pqueue unprocessed_rcds; 250237657Sjkim pqueue processed_rcds; 251237657Sjkim pqueue buffered_messages; 252280297Sjkim pqueue sent_messages; 253280297Sjkim pqueue buffered_app_data; 254280297Sjkim unsigned int mtu; 255280297Sjkim unsigned int link_mtu; 256237657Sjkim 257280297Sjkim if (s->d1) { 258280297Sjkim unprocessed_rcds = s->d1->unprocessed_rcds.q; 259280297Sjkim processed_rcds = s->d1->processed_rcds.q; 260280297Sjkim buffered_messages = s->d1->buffered_messages; 261280297Sjkim sent_messages = s->d1->sent_messages; 262280297Sjkim buffered_app_data = s->d1->buffered_app_data.q; 263280297Sjkim mtu = s->d1->mtu; 264280297Sjkim link_mtu = s->d1->link_mtu; 265237657Sjkim 266280297Sjkim dtls1_clear_queues(s); 267237657Sjkim 268280297Sjkim memset(s->d1, 0, sizeof(*(s->d1))); 269237657Sjkim 270280297Sjkim if (s->server) { 271280297Sjkim s->d1->cookie_len = sizeof(s->d1->cookie); 272280297Sjkim } 273237657Sjkim 274280297Sjkim if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) { 275280297Sjkim s->d1->mtu = mtu; 276280297Sjkim s->d1->link_mtu = link_mtu; 277280297Sjkim } 278237657Sjkim 279280297Sjkim s->d1->unprocessed_rcds.q = unprocessed_rcds; 280280297Sjkim s->d1->processed_rcds.q = processed_rcds; 281280297Sjkim s->d1->buffered_messages = buffered_messages; 282280297Sjkim s->d1->sent_messages = sent_messages; 283280297Sjkim s->d1->buffered_app_data.q = buffered_app_data; 284280297Sjkim } 285237657Sjkim 286280297Sjkim ssl3_clear(s); 287280297Sjkim if (s->options & SSL_OP_CISCO_ANYCONNECT) 288290207Sjkim s->client_version = s->version = DTLS1_BAD_VER; 289290207Sjkim else if (s->method->version == DTLS_ANY_VERSION) 290290207Sjkim s->version = DTLS1_2_VERSION; 291280297Sjkim else 292290207Sjkim s->version = s->method->version; 293280297Sjkim} 294194206Ssimon 295205128Ssimonlong dtls1_ctrl(SSL *s, int cmd, long larg, void *parg) 296280297Sjkim{ 297280297Sjkim int ret = 0; 298205128Ssimon 299280297Sjkim switch (cmd) { 300280297Sjkim case DTLS_CTRL_GET_TIMEOUT: 301280297Sjkim if (dtls1_get_timeout(s, (struct timeval *)parg) != NULL) { 302280297Sjkim ret = 1; 303280297Sjkim } 304280297Sjkim break; 305280297Sjkim case DTLS_CTRL_HANDLE_TIMEOUT: 306280297Sjkim ret = dtls1_handle_timeout(s); 307280297Sjkim break; 308280297Sjkim case DTLS_CTRL_LISTEN: 309280297Sjkim ret = dtls1_listen(s, parg); 310280297Sjkim break; 311280297Sjkim case SSL_CTRL_CHECK_PROTO_VERSION: 312280297Sjkim /* 313280297Sjkim * For library-internal use; checks that the current protocol is the 314280297Sjkim * highest enabled version (according to s->ctx->method, as version 315280297Sjkim * negotiation may have changed s->method). 316280297Sjkim */ 317290207Sjkim if (s->version == s->ctx->method->version) 318290207Sjkim return 1; 319280297Sjkim /* 320290207Sjkim * Apparently we're using a version-flexible SSL_METHOD (not at its 321290207Sjkim * highest protocol version). 322280297Sjkim */ 323290207Sjkim if (s->ctx->method->version == DTLS_method()->version) { 324290207Sjkim#if DTLS_MAX_VERSION != DTLS1_2_VERSION 325290207Sjkim# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION. 326290207Sjkim#endif 327290207Sjkim if (!(s->options & SSL_OP_NO_DTLSv1_2)) 328290207Sjkim return s->version == DTLS1_2_VERSION; 329290207Sjkim if (!(s->options & SSL_OP_NO_DTLSv1)) 330290207Sjkim return s->version == DTLS1_VERSION; 331290207Sjkim } 332290207Sjkim return 0; /* Unexpected state; fail closed. */ 333280297Sjkim case DTLS_CTRL_SET_LINK_MTU: 334280297Sjkim if (larg < (long)dtls1_link_min_mtu()) 335280297Sjkim return 0; 336280297Sjkim s->d1->link_mtu = larg; 337280297Sjkim return 1; 338280297Sjkim case DTLS_CTRL_GET_LINK_MIN_MTU: 339280297Sjkim return (long)dtls1_link_min_mtu(); 340280297Sjkim case SSL_CTRL_SET_MTU: 341280297Sjkim /* 342280297Sjkim * We may not have a BIO set yet so can't call dtls1_min_mtu() 343280297Sjkim * We'll have to make do with dtls1_link_min_mtu() and max overhead 344280297Sjkim */ 345280297Sjkim if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD) 346280297Sjkim return 0; 347280297Sjkim s->d1->mtu = larg; 348280297Sjkim return larg; 349280297Sjkim default: 350280297Sjkim ret = ssl3_ctrl(s, cmd, larg, parg); 351280297Sjkim break; 352280297Sjkim } 353280297Sjkim return (ret); 354280297Sjkim} 355205128Ssimon 356194206Ssimon/* 357194206Ssimon * As it's impossible to use stream ciphers in "datagram" mode, this 358194206Ssimon * simple filter is designed to disengage them in DTLS. Unfortunately 359194206Ssimon * there is no universal way to identify stream SSL_CIPHER, so we have 360194206Ssimon * to explicitly list their SSL_* codes. Currently RC4 is the only one 361194206Ssimon * available, but if new ones emerge, they will have to be added... 362194206Ssimon */ 363238405Sjkimconst SSL_CIPHER *dtls1_get_cipher(unsigned int u) 364280297Sjkim{ 365280297Sjkim const SSL_CIPHER *ciph = ssl3_get_cipher(u); 366194206Ssimon 367280297Sjkim if (ciph != NULL) { 368280297Sjkim if (ciph->algorithm_enc == SSL_RC4) 369280297Sjkim return NULL; 370280297Sjkim } 371194206Ssimon 372280297Sjkim return ciph; 373280297Sjkim} 374205128Ssimon 375205128Ssimonvoid dtls1_start_timer(SSL *s) 376280297Sjkim{ 377238405Sjkim#ifndef OPENSSL_NO_SCTP 378280297Sjkim /* Disable timer for SCTP */ 379280297Sjkim if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 380280297Sjkim memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); 381280297Sjkim return; 382280297Sjkim } 383238405Sjkim#endif 384238405Sjkim 385280297Sjkim /* If timer is not set, initialize duration with 1 second */ 386280297Sjkim if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) { 387280297Sjkim s->d1->timeout_duration = 1; 388280297Sjkim } 389205128Ssimon 390280297Sjkim /* Set timeout to current time */ 391280297Sjkim get_current_time(&(s->d1->next_timeout)); 392205128Ssimon 393280297Sjkim /* Add duration to current time */ 394280297Sjkim s->d1->next_timeout.tv_sec += s->d1->timeout_duration; 395280297Sjkim BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, 396280297Sjkim &(s->d1->next_timeout)); 397280297Sjkim} 398205128Ssimon 399280297Sjkimstruct timeval *dtls1_get_timeout(SSL *s, struct timeval *timeleft) 400280297Sjkim{ 401280297Sjkim struct timeval timenow; 402205128Ssimon 403280297Sjkim /* If no timeout is set, just return NULL */ 404280297Sjkim if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) { 405280297Sjkim return NULL; 406280297Sjkim } 407205128Ssimon 408280297Sjkim /* Get current time */ 409280297Sjkim get_current_time(&timenow); 410205128Ssimon 411280297Sjkim /* If timer already expired, set remaining time to 0 */ 412280297Sjkim if (s->d1->next_timeout.tv_sec < timenow.tv_sec || 413280297Sjkim (s->d1->next_timeout.tv_sec == timenow.tv_sec && 414280297Sjkim s->d1->next_timeout.tv_usec <= timenow.tv_usec)) { 415280297Sjkim memset(timeleft, 0, sizeof(struct timeval)); 416280297Sjkim return timeleft; 417280297Sjkim } 418205128Ssimon 419280297Sjkim /* Calculate time left until timer expires */ 420280297Sjkim memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval)); 421280297Sjkim timeleft->tv_sec -= timenow.tv_sec; 422280297Sjkim timeleft->tv_usec -= timenow.tv_usec; 423280297Sjkim if (timeleft->tv_usec < 0) { 424280297Sjkim timeleft->tv_sec--; 425280297Sjkim timeleft->tv_usec += 1000000; 426280297Sjkim } 427215697Ssimon 428280297Sjkim /* 429280297Sjkim * If remaining time is less than 15 ms, set it to 0 to prevent issues 430280297Sjkim * because of small devergences with socket timeouts. 431280297Sjkim */ 432280297Sjkim if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) { 433280297Sjkim memset(timeleft, 0, sizeof(struct timeval)); 434280297Sjkim } 435205128Ssimon 436280297Sjkim return timeleft; 437280297Sjkim} 438280297Sjkim 439205128Ssimonint dtls1_is_timer_expired(SSL *s) 440280297Sjkim{ 441280297Sjkim struct timeval timeleft; 442205128Ssimon 443280297Sjkim /* Get time left until timeout, return false if no timer running */ 444280297Sjkim if (dtls1_get_timeout(s, &timeleft) == NULL) { 445280297Sjkim return 0; 446280297Sjkim } 447205128Ssimon 448280297Sjkim /* Return false if timer is not expired yet */ 449280297Sjkim if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) { 450280297Sjkim return 0; 451280297Sjkim } 452205128Ssimon 453280297Sjkim /* Timer expired, so return true */ 454280297Sjkim return 1; 455280297Sjkim} 456205128Ssimon 457205128Ssimonvoid dtls1_double_timeout(SSL *s) 458280297Sjkim{ 459280297Sjkim s->d1->timeout_duration *= 2; 460280297Sjkim if (s->d1->timeout_duration > 60) 461280297Sjkim s->d1->timeout_duration = 60; 462280297Sjkim dtls1_start_timer(s); 463280297Sjkim} 464205128Ssimon 465205128Ssimonvoid dtls1_stop_timer(SSL *s) 466280297Sjkim{ 467280297Sjkim /* Reset everything */ 468280297Sjkim memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st)); 469280297Sjkim memset(&(s->d1->next_timeout), 0, sizeof(struct timeval)); 470280297Sjkim s->d1->timeout_duration = 1; 471280297Sjkim BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, 472280297Sjkim &(s->d1->next_timeout)); 473280297Sjkim /* Clear retransmission buffer */ 474306195Sjkim dtls1_clear_sent_buffer(s); 475280297Sjkim} 476205128Ssimon 477237657Sjkimint dtls1_check_timeout_num(SSL *s) 478280297Sjkim{ 479280297Sjkim unsigned int mtu; 480276861Sjkim 481280297Sjkim s->d1->timeout.num_alerts++; 482205128Ssimon 483280297Sjkim /* Reduce MTU after 2 unsuccessful retransmissions */ 484280297Sjkim if (s->d1->timeout.num_alerts > 2 485280297Sjkim && !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) { 486280297Sjkim mtu = 487280297Sjkim BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, 488280297Sjkim NULL); 489280297Sjkim if (mtu < s->d1->mtu) 490280297Sjkim s->d1->mtu = mtu; 491280297Sjkim } 492205128Ssimon 493280297Sjkim if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) { 494280297Sjkim /* fail the connection, enough alerts have been sent */ 495280297Sjkim SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED); 496280297Sjkim return -1; 497280297Sjkim } 498237657Sjkim 499280297Sjkim return 0; 500280297Sjkim} 501237657Sjkim 502237657Sjkimint dtls1_handle_timeout(SSL *s) 503280297Sjkim{ 504280297Sjkim /* if no timer is expired, don't do anything */ 505280297Sjkim if (!dtls1_is_timer_expired(s)) { 506280297Sjkim return 0; 507280297Sjkim } 508205128Ssimon 509280297Sjkim dtls1_double_timeout(s); 510237657Sjkim 511280297Sjkim if (dtls1_check_timeout_num(s) < 0) 512280297Sjkim return -1; 513237657Sjkim 514280297Sjkim s->d1->timeout.read_timeouts++; 515280297Sjkim if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) { 516280297Sjkim s->d1->timeout.read_timeouts = 1; 517280297Sjkim } 518238405Sjkim#ifndef OPENSSL_NO_HEARTBEATS 519280297Sjkim if (s->tlsext_hb_pending) { 520280297Sjkim s->tlsext_hb_pending = 0; 521280297Sjkim return dtls1_heartbeat(s); 522280297Sjkim } 523238405Sjkim#endif 524238405Sjkim 525280297Sjkim dtls1_start_timer(s); 526280297Sjkim return dtls1_retransmit_buffered_messages(s); 527280297Sjkim} 528205128Ssimon 529205128Ssimonstatic void get_current_time(struct timeval *t) 530205128Ssimon{ 531290207Sjkim#if defined(_WIN32) 532290207Sjkim SYSTEMTIME st; 533290207Sjkim union { 534290207Sjkim unsigned __int64 ul; 535290207Sjkim FILETIME ft; 536290207Sjkim } now; 537290207Sjkim 538290207Sjkim GetSystemTime(&st); 539290207Sjkim SystemTimeToFileTime(&st, &now.ft); 540290207Sjkim# ifdef __MINGW32__ 541290207Sjkim now.ul -= 116444736000000000ULL; 542290207Sjkim# else 543290207Sjkim now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */ 544290207Sjkim# endif 545290207Sjkim t->tv_sec = (long)(now.ul / 10000000); 546290207Sjkim t->tv_usec = ((int)(now.ul % 10000000)) / 10; 547205128Ssimon#elif defined(OPENSSL_SYS_VMS) 548280297Sjkim struct timeb tb; 549280297Sjkim ftime(&tb); 550280297Sjkim t->tv_sec = (long)tb.time; 551280297Sjkim t->tv_usec = (long)tb.millitm * 1000; 552205128Ssimon#else 553280297Sjkim gettimeofday(t, NULL); 554205128Ssimon#endif 555205128Ssimon} 556205128Ssimon 557205128Ssimonint dtls1_listen(SSL *s, struct sockaddr *client) 558280297Sjkim{ 559280297Sjkim int ret; 560205128Ssimon 561284283Sjkim /* Ensure there is no state left over from a previous invocation */ 562284283Sjkim SSL_clear(s); 563284283Sjkim 564280297Sjkim SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE); 565280297Sjkim s->d1->listen = 1; 566205128Ssimon 567280297Sjkim ret = SSL_accept(s); 568280297Sjkim if (ret <= 0) 569280297Sjkim return ret; 570280297Sjkim 571280297Sjkim (void)BIO_dgram_get_peer(SSL_get_rbio(s), client); 572280297Sjkim return 1; 573280297Sjkim} 574290207Sjkim 575290207Sjkimstatic void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len) 576290207Sjkim{ 577290207Sjkim unsigned char *p = (unsigned char *)s->init_buf->data; 578290207Sjkim dtls1_set_message_header(s, p, htype, len, 0, len); 579290207Sjkim s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH; 580290207Sjkim s->init_off = 0; 581290207Sjkim /* Buffer the message to handle re-xmits */ 582290207Sjkim dtls1_buffer_message(s, 0); 583290207Sjkim} 584290207Sjkim 585290207Sjkimstatic int dtls1_handshake_write(SSL *s) 586290207Sjkim{ 587290207Sjkim return dtls1_do_write(s, SSL3_RT_HANDSHAKE); 588290207Sjkim} 589