1/* ssl/d1_clnt.c */ 2/* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#ifndef OPENSSL_NO_KRB5 119# include "kssl_lcl.h" 120#endif 121#include <openssl/buffer.h> 122#include <openssl/rand.h> 123#include <openssl/objects.h> 124#include <openssl/evp.h> 125#include <openssl/md5.h> 126#include <openssl/bn.h> 127#ifndef OPENSSL_NO_DH 128# include <openssl/dh.h> 129#endif 130 131static const SSL_METHOD *dtls1_get_client_method(int ver); 132static int dtls1_get_hello_verify(SSL *s); 133 134static const SSL_METHOD *dtls1_get_client_method(int ver) 135{ 136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 137 return (DTLSv1_client_method()); 138 else if (ver == DTLS1_2_VERSION) 139 return (DTLSv1_2_client_method()); 140 else 141 return (NULL); 142} 143 144IMPLEMENT_dtls1_meth_func(DTLS1_VERSION, 145 DTLSv1_client_method, 146 ssl_undefined_function, 147 dtls1_connect, 148 dtls1_get_client_method, DTLSv1_enc_data) 149 150 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION, 151 DTLSv1_2_client_method, 152 ssl_undefined_function, 153 dtls1_connect, 154 dtls1_get_client_method, DTLSv1_2_enc_data) 155 156 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION, 157 DTLS_client_method, 158 ssl_undefined_function, 159 dtls1_connect, 160 dtls1_get_client_method, DTLSv1_2_enc_data) 161 162int dtls1_connect(SSL *s) 163{ 164 BUF_MEM *buf = NULL; 165 unsigned long Time = (unsigned long)time(NULL); 166 void (*cb) (const SSL *ssl, int type, int val) = NULL; 167 int ret = -1; 168 int new_state, state, skip = 0; 169#ifndef OPENSSL_NO_SCTP 170 unsigned char sctpauthkey[64]; 171 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 172#endif 173 174 RAND_add(&Time, sizeof(Time), 0); 175 ERR_clear_error(); 176 clear_sys_error(); 177 178 if (s->info_callback != NULL) 179 cb = s->info_callback; 180 else if (s->ctx->info_callback != NULL) 181 cb = s->ctx->info_callback; 182 183 s->in_handshake++; 184 if (!SSL_in_init(s) || SSL_in_before(s)) 185 SSL_clear(s); 186 187#ifndef OPENSSL_NO_SCTP 188 /* 189 * Notify SCTP BIO socket to enter handshake mode and prevent stream 190 * identifier other than 0. Will be ignored if no SCTP is used. 191 */ 192 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 193 s->in_handshake, NULL); 194#endif 195 196#ifndef OPENSSL_NO_HEARTBEATS 197 /* 198 * If we're awaiting a HeartbeatResponse, pretend we already got and 199 * don't await it anymore, because Heartbeats don't make sense during 200 * handshakes anyway. 201 */ 202 if (s->tlsext_hb_pending) { 203 dtls1_stop_timer(s); 204 s->tlsext_hb_pending = 0; 205 s->tlsext_hb_seq++; 206 } 207#endif 208 209 for (;;) { 210 state = s->state; 211 212 switch (s->state) { 213 case SSL_ST_RENEGOTIATE: 214 s->renegotiate = 1; 215 s->state = SSL_ST_CONNECT; 216 s->ctx->stats.sess_connect_renegotiate++; 217 /* break */ 218 case SSL_ST_BEFORE: 219 case SSL_ST_CONNECT: 220 case SSL_ST_BEFORE | SSL_ST_CONNECT: 221 case SSL_ST_OK | SSL_ST_CONNECT: 222 223 s->server = 0; 224 if (cb != NULL) 225 cb(s, SSL_CB_HANDSHAKE_START, 1); 226 227 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) && 228 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) { 229 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 230 ret = -1; 231 s->state = SSL_ST_ERR; 232 goto end; 233 } 234 235 /* s->version=SSL3_VERSION; */ 236 s->type = SSL_ST_CONNECT; 237 238 if (s->init_buf == NULL) { 239 if ((buf = BUF_MEM_new()) == NULL) { 240 ret = -1; 241 s->state = SSL_ST_ERR; 242 goto end; 243 } 244 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 245 ret = -1; 246 s->state = SSL_ST_ERR; 247 goto end; 248 } 249 s->init_buf = buf; 250 buf = NULL; 251 } 252 253 if (!ssl3_setup_buffers(s)) { 254 ret = -1; 255 s->state = SSL_ST_ERR; 256 goto end; 257 } 258 259 /* setup buffing BIO */ 260 if (!ssl_init_wbio_buffer(s, 0)) { 261 ret = -1; 262 s->state = SSL_ST_ERR; 263 goto end; 264 } 265 266 /* don't push the buffering BIO quite yet */ 267 268 s->state = SSL3_ST_CW_CLNT_HELLO_A; 269 s->ctx->stats.sess_connect++; 270 s->init_num = 0; 271 /* mark client_random uninitialized */ 272 memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); 273 s->d1->send_cookie = 0; 274 s->hit = 0; 275 s->d1->change_cipher_spec_ok = 0; 276 /* 277 * Should have been reset by ssl3_get_finished, too. 278 */ 279 s->s3->change_cipher_spec = 0; 280 break; 281 282#ifndef OPENSSL_NO_SCTP 283 case DTLS1_SCTP_ST_CR_READ_SOCK: 284 285 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 286 s->s3->in_read_app_data = 2; 287 s->rwstate = SSL_READING; 288 BIO_clear_retry_flags(SSL_get_rbio(s)); 289 BIO_set_retry_read(SSL_get_rbio(s)); 290 ret = -1; 291 goto end; 292 } 293 294 s->state = s->s3->tmp.next_state; 295 break; 296 297 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 298 /* read app data until dry event */ 299 300 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 301 if (ret < 0) 302 goto end; 303 304 if (ret == 0) { 305 s->s3->in_read_app_data = 2; 306 s->rwstate = SSL_READING; 307 BIO_clear_retry_flags(SSL_get_rbio(s)); 308 BIO_set_retry_read(SSL_get_rbio(s)); 309 ret = -1; 310 goto end; 311 } 312 313 s->state = s->d1->next_state; 314 break; 315#endif 316 317 case SSL3_ST_CW_CLNT_HELLO_A: 318 case SSL3_ST_CW_CLNT_HELLO_B: 319 320 s->shutdown = 0; 321 322 /* every DTLS ClientHello resets Finished MAC */ 323 ssl3_init_finished_mac(s); 324 325 dtls1_start_timer(s); 326 ret = ssl3_client_hello(s); 327 if (ret <= 0) 328 goto end; 329 330 if (s->d1->send_cookie) { 331 s->state = SSL3_ST_CW_FLUSH; 332 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 333 } else 334 s->state = SSL3_ST_CR_SRVR_HELLO_A; 335 336 s->init_num = 0; 337 338#ifndef OPENSSL_NO_SCTP 339 /* Disable buffering for SCTP */ 340 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 341#endif 342 /* 343 * turn on buffering for the next lot of output 344 */ 345 if (s->bbio != s->wbio) 346 s->wbio = BIO_push(s->bbio, s->wbio); 347#ifndef OPENSSL_NO_SCTP 348 } 349#endif 350 351 break; 352 353 case SSL3_ST_CR_SRVR_HELLO_A: 354 case SSL3_ST_CR_SRVR_HELLO_B: 355 ret = ssl3_get_server_hello(s); 356 if (ret <= 0) 357 goto end; 358 else { 359 if (s->hit) { 360#ifndef OPENSSL_NO_SCTP 361 /* 362 * Add new shared key for SCTP-Auth, will be ignored if 363 * no SCTP used. 364 */ 365 snprintf((char *)labelbuffer, 366 sizeof(DTLS1_SCTP_AUTH_LABEL), 367 DTLS1_SCTP_AUTH_LABEL); 368 369 SSL_export_keying_material(s, sctpauthkey, 370 sizeof(sctpauthkey), 371 labelbuffer, 372 sizeof(labelbuffer), NULL, 0, 373 0); 374 375 BIO_ctrl(SSL_get_wbio(s), 376 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 377 sizeof(sctpauthkey), sctpauthkey); 378#endif 379 380 s->state = SSL3_ST_CR_FINISHED_A; 381 } else 382 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 383 } 384 s->init_num = 0; 385 break; 386 387 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 388 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 389 390 ret = dtls1_get_hello_verify(s); 391 if (ret <= 0) 392 goto end; 393 dtls1_stop_timer(s); 394 if (s->d1->send_cookie) /* start again, with a cookie */ 395 s->state = SSL3_ST_CW_CLNT_HELLO_A; 396 else 397 s->state = SSL3_ST_CR_CERT_A; 398 s->init_num = 0; 399 break; 400 401 case SSL3_ST_CR_CERT_A: 402 case SSL3_ST_CR_CERT_B: 403 /* Check if it is anon DH or PSK */ 404 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 405 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 406 ret = ssl3_get_server_certificate(s); 407 if (ret <= 0) 408 goto end; 409#ifndef OPENSSL_NO_TLSEXT 410 if (s->tlsext_status_expected) 411 s->state = SSL3_ST_CR_CERT_STATUS_A; 412 else 413 s->state = SSL3_ST_CR_KEY_EXCH_A; 414 } else { 415 skip = 1; 416 s->state = SSL3_ST_CR_KEY_EXCH_A; 417 } 418#else 419 } else 420 skip = 1; 421 422 s->state = SSL3_ST_CR_KEY_EXCH_A; 423#endif 424 s->init_num = 0; 425 break; 426 427 case SSL3_ST_CR_KEY_EXCH_A: 428 case SSL3_ST_CR_KEY_EXCH_B: 429 ret = ssl3_get_key_exchange(s); 430 if (ret <= 0) 431 goto end; 432 s->state = SSL3_ST_CR_CERT_REQ_A; 433 s->init_num = 0; 434 435 /* 436 * at this point we check that we have the required stuff from 437 * the server 438 */ 439 if (!ssl3_check_cert_and_algorithm(s)) { 440 ret = -1; 441 s->state = SSL_ST_ERR; 442 goto end; 443 } 444 break; 445 446 case SSL3_ST_CR_CERT_REQ_A: 447 case SSL3_ST_CR_CERT_REQ_B: 448 ret = ssl3_get_certificate_request(s); 449 if (ret <= 0) 450 goto end; 451 s->state = SSL3_ST_CR_SRVR_DONE_A; 452 s->init_num = 0; 453 break; 454 455 case SSL3_ST_CR_SRVR_DONE_A: 456 case SSL3_ST_CR_SRVR_DONE_B: 457 ret = ssl3_get_server_done(s); 458 if (ret <= 0) 459 goto end; 460 dtls1_stop_timer(s); 461 if (s->s3->tmp.cert_req) 462 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 463 else 464 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 465 s->init_num = 0; 466 467#ifndef OPENSSL_NO_SCTP 468 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 469 state == SSL_ST_RENEGOTIATE) 470 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 471 else 472#endif 473 s->state = s->s3->tmp.next_state; 474 break; 475 476 case SSL3_ST_CW_CERT_A: 477 case SSL3_ST_CW_CERT_B: 478 case SSL3_ST_CW_CERT_C: 479 case SSL3_ST_CW_CERT_D: 480 dtls1_start_timer(s); 481 ret = ssl3_send_client_certificate(s); 482 if (ret <= 0) 483 goto end; 484 s->state = SSL3_ST_CW_KEY_EXCH_A; 485 s->init_num = 0; 486 break; 487 488 case SSL3_ST_CW_KEY_EXCH_A: 489 case SSL3_ST_CW_KEY_EXCH_B: 490 dtls1_start_timer(s); 491 ret = ssl3_send_client_key_exchange(s); 492 if (ret <= 0) 493 goto end; 494 495#ifndef OPENSSL_NO_SCTP 496 /* 497 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 498 * used. 499 */ 500 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 501 DTLS1_SCTP_AUTH_LABEL); 502 503 SSL_export_keying_material(s, sctpauthkey, 504 sizeof(sctpauthkey), labelbuffer, 505 sizeof(labelbuffer), NULL, 0, 0); 506 507 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 508 sizeof(sctpauthkey), sctpauthkey); 509#endif 510 511 /* 512 * EAY EAY EAY need to check for DH fix cert sent back 513 */ 514 /* 515 * For TLS, cert_req is set to 2, so a cert chain of nothing is 516 * sent, but no verify packet is sent 517 */ 518 if (s->s3->tmp.cert_req == 1) { 519 s->state = SSL3_ST_CW_CERT_VRFY_A; 520 } else { 521#ifndef OPENSSL_NO_SCTP 522 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 523 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 524 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 525 } else 526#endif 527 s->state = SSL3_ST_CW_CHANGE_A; 528 } 529 530 s->init_num = 0; 531 break; 532 533 case SSL3_ST_CW_CERT_VRFY_A: 534 case SSL3_ST_CW_CERT_VRFY_B: 535 dtls1_start_timer(s); 536 ret = ssl3_send_client_verify(s); 537 if (ret <= 0) 538 goto end; 539#ifndef OPENSSL_NO_SCTP 540 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 541 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 542 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 543 } else 544#endif 545 s->state = SSL3_ST_CW_CHANGE_A; 546 s->init_num = 0; 547 break; 548 549 case SSL3_ST_CW_CHANGE_A: 550 case SSL3_ST_CW_CHANGE_B: 551 if (!s->hit) 552 dtls1_start_timer(s); 553 ret = dtls1_send_change_cipher_spec(s, 554 SSL3_ST_CW_CHANGE_A, 555 SSL3_ST_CW_CHANGE_B); 556 if (ret <= 0) 557 goto end; 558 559 s->state = SSL3_ST_CW_FINISHED_A; 560 s->init_num = 0; 561 562 s->session->cipher = s->s3->tmp.new_cipher; 563#ifdef OPENSSL_NO_COMP 564 s->session->compress_meth = 0; 565#else 566 if (s->s3->tmp.new_compression == NULL) 567 s->session->compress_meth = 0; 568 else 569 s->session->compress_meth = s->s3->tmp.new_compression->id; 570#endif 571 if (!s->method->ssl3_enc->setup_key_block(s)) { 572 ret = -1; 573 s->state = SSL_ST_ERR; 574 goto end; 575 } 576 577 if (!s->method->ssl3_enc->change_cipher_state(s, 578 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 579 { 580 ret = -1; 581 s->state = SSL_ST_ERR; 582 goto end; 583 } 584#ifndef OPENSSL_NO_SCTP 585 if (s->hit) { 586 /* 587 * Change to new shared key of SCTP-Auth, will be ignored if 588 * no SCTP used. 589 */ 590 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 591 0, NULL); 592 } 593#endif 594 595 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 596 break; 597 598 case SSL3_ST_CW_FINISHED_A: 599 case SSL3_ST_CW_FINISHED_B: 600 if (!s->hit) 601 dtls1_start_timer(s); 602 ret = ssl3_send_finished(s, 603 SSL3_ST_CW_FINISHED_A, 604 SSL3_ST_CW_FINISHED_B, 605 s->method-> 606 ssl3_enc->client_finished_label, 607 s->method-> 608 ssl3_enc->client_finished_label_len); 609 if (ret <= 0) 610 goto end; 611 s->state = SSL3_ST_CW_FLUSH; 612 613 /* clear flags */ 614 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 615 if (s->hit) { 616 s->s3->tmp.next_state = SSL_ST_OK; 617#ifndef OPENSSL_NO_SCTP 618 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 619 s->d1->next_state = s->s3->tmp.next_state; 620 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 621 } 622#endif 623 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 624 s->state = SSL_ST_OK; 625#ifndef OPENSSL_NO_SCTP 626 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 627 s->d1->next_state = SSL_ST_OK; 628 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 629 } 630#endif 631 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 632 s->s3->delay_buf_pop_ret = 0; 633 } 634 } else { 635#ifndef OPENSSL_NO_SCTP 636 /* 637 * Change to new shared key of SCTP-Auth, will be ignored if 638 * no SCTP used. 639 */ 640 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 641 0, NULL); 642#endif 643 644#ifndef OPENSSL_NO_TLSEXT 645 /* 646 * Allow NewSessionTicket if ticket expected 647 */ 648 if (s->tlsext_ticket_expected) 649 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 650 else 651#endif 652 653 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 654 } 655 s->init_num = 0; 656 break; 657 658#ifndef OPENSSL_NO_TLSEXT 659 case SSL3_ST_CR_SESSION_TICKET_A: 660 case SSL3_ST_CR_SESSION_TICKET_B: 661 ret = ssl3_get_new_session_ticket(s); 662 if (ret <= 0) 663 goto end; 664 s->state = SSL3_ST_CR_FINISHED_A; 665 s->init_num = 0; 666 break; 667 668 case SSL3_ST_CR_CERT_STATUS_A: 669 case SSL3_ST_CR_CERT_STATUS_B: 670 ret = ssl3_get_cert_status(s); 671 if (ret <= 0) 672 goto end; 673 s->state = SSL3_ST_CR_KEY_EXCH_A; 674 s->init_num = 0; 675 break; 676#endif 677 678 case SSL3_ST_CR_FINISHED_A: 679 case SSL3_ST_CR_FINISHED_B: 680 s->d1->change_cipher_spec_ok = 1; 681 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 682 SSL3_ST_CR_FINISHED_B); 683 if (ret <= 0) 684 goto end; 685 dtls1_stop_timer(s); 686 687 if (s->hit) 688 s->state = SSL3_ST_CW_CHANGE_A; 689 else 690 s->state = SSL_ST_OK; 691 692#ifndef OPENSSL_NO_SCTP 693 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 694 state == SSL_ST_RENEGOTIATE) { 695 s->d1->next_state = s->state; 696 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 697 } 698#endif 699 700 s->init_num = 0; 701 break; 702 703 case SSL3_ST_CW_FLUSH: 704 s->rwstate = SSL_WRITING; 705 if (BIO_flush(s->wbio) <= 0) { 706 /* 707 * If the write error was fatal, stop trying 708 */ 709 if (!BIO_should_retry(s->wbio)) { 710 s->rwstate = SSL_NOTHING; 711 s->state = s->s3->tmp.next_state; 712 } 713 714 ret = -1; 715 goto end; 716 } 717 s->rwstate = SSL_NOTHING; 718 s->state = s->s3->tmp.next_state; 719 break; 720 721 case SSL_ST_OK: 722 /* clean a few things up */ 723 ssl3_cleanup_key_block(s); 724 725#if 0 726 if (s->init_buf != NULL) { 727 BUF_MEM_free(s->init_buf); 728 s->init_buf = NULL; 729 } 730#endif 731 732 /* 733 * If we are not 'joining' the last two packets, remove the 734 * buffering now 735 */ 736 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 737 ssl_free_wbio_buffer(s); 738 /* else do it later in ssl3_write */ 739 740 s->init_num = 0; 741 s->renegotiate = 0; 742 s->new_session = 0; 743 744 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 745 if (s->hit) 746 s->ctx->stats.sess_hit++; 747 748 ret = 1; 749 /* s->server=0; */ 750 s->handshake_func = dtls1_connect; 751 s->ctx->stats.sess_connect_good++; 752 753 if (cb != NULL) 754 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 755 756 /* done with handshaking */ 757 s->d1->handshake_read_seq = 0; 758 s->d1->next_handshake_write_seq = 0; 759 goto end; 760 /* break; */ 761 762 case SSL_ST_ERR: 763 default: 764 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 765 ret = -1; 766 goto end; 767 /* break; */ 768 } 769 770 /* did we do anything */ 771 if (!s->s3->tmp.reuse_message && !skip) { 772 if (s->debug) { 773 if ((ret = BIO_flush(s->wbio)) <= 0) 774 goto end; 775 } 776 777 if ((cb != NULL) && (s->state != state)) { 778 new_state = s->state; 779 s->state = state; 780 cb(s, SSL_CB_CONNECT_LOOP, 1); 781 s->state = new_state; 782 } 783 } 784 skip = 0; 785 } 786 end: 787 s->in_handshake--; 788 789#ifndef OPENSSL_NO_SCTP 790 /* 791 * Notify SCTP BIO socket to leave handshake mode and allow stream 792 * identifier other than 0. Will be ignored if no SCTP is used. 793 */ 794 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 795 s->in_handshake, NULL); 796#endif 797 798 if (buf != NULL) 799 BUF_MEM_free(buf); 800 if (cb != NULL) 801 cb(s, SSL_CB_CONNECT_EXIT, ret); 802 return (ret); 803} 804 805static int dtls1_get_hello_verify(SSL *s) 806{ 807 int n, al, ok = 0; 808 unsigned char *data; 809 unsigned int cookie_len; 810 811 s->first_packet = 1; 812 n = s->method->ssl_get_message(s, 813 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 814 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 815 -1, s->max_cert_list, &ok); 816 s->first_packet = 0; 817 818 if (!ok) 819 return ((int)n); 820 821 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 822 s->d1->send_cookie = 0; 823 s->s3->tmp.reuse_message = 1; 824 return (1); 825 } 826 827 data = (unsigned char *)s->init_msg; 828#if 0 829 if (s->method->version != DTLS_ANY_VERSION && 830 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff)))) 831 { 832 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 833 s->version = (s->version & 0xff00) | data[1]; 834 al = SSL_AD_PROTOCOL_VERSION; 835 goto f_err; 836 } 837#endif 838 data += 2; 839 840 cookie_len = *(data++); 841 if (cookie_len > sizeof(s->d1->cookie)) { 842 al = SSL_AD_ILLEGAL_PARAMETER; 843 goto f_err; 844 } 845 846 memcpy(s->d1->cookie, data, cookie_len); 847 s->d1->cookie_len = cookie_len; 848 849 s->d1->send_cookie = 1; 850 return 1; 851 852 f_err: 853 ssl3_send_alert(s, SSL3_AL_FATAL, al); 854 s->state = SSL_ST_ERR; 855 return -1; 856} 857