d1_clnt.c revision 306195
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 == DTLS_ANY_VERSION) 137 return DTLS_client_method(); 138 else if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER) 139 return DTLSv1_client_method(); 140 else if (ver == DTLS1_2_VERSION) 141 return DTLSv1_2_client_method(); 142 else 143 return NULL; 144} 145 146IMPLEMENT_dtls1_meth_func(DTLS1_VERSION, 147 DTLSv1_client_method, 148 ssl_undefined_function, 149 dtls1_connect, 150 dtls1_get_client_method, DTLSv1_enc_data) 151 152IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION, 153 DTLSv1_2_client_method, 154 ssl_undefined_function, 155 dtls1_connect, 156 dtls1_get_client_method, DTLSv1_2_enc_data) 157 158IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION, 159 DTLS_client_method, 160 ssl_undefined_function, 161 dtls1_connect, 162 dtls1_get_client_method, DTLSv1_2_enc_data) 163 164int dtls1_connect(SSL *s) 165{ 166 BUF_MEM *buf = NULL; 167 unsigned long Time = (unsigned long)time(NULL); 168 void (*cb) (const SSL *ssl, int type, int val) = NULL; 169 int ret = -1; 170 int new_state, state, skip = 0; 171#ifndef OPENSSL_NO_SCTP 172 unsigned char sctpauthkey[64]; 173 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 174#endif 175 176 RAND_add(&Time, sizeof(Time), 0); 177 ERR_clear_error(); 178 clear_sys_error(); 179 180 if (s->info_callback != NULL) 181 cb = s->info_callback; 182 else if (s->ctx->info_callback != NULL) 183 cb = s->ctx->info_callback; 184 185 s->in_handshake++; 186 if (!SSL_in_init(s) || SSL_in_before(s)) 187 SSL_clear(s); 188 189#ifndef OPENSSL_NO_SCTP 190 /* 191 * Notify SCTP BIO socket to enter handshake mode and prevent stream 192 * identifier other than 0. Will be ignored if no SCTP is used. 193 */ 194 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 195 s->in_handshake, NULL); 196#endif 197 198#ifndef OPENSSL_NO_HEARTBEATS 199 /* 200 * If we're awaiting a HeartbeatResponse, pretend we already got and 201 * don't await it anymore, because Heartbeats don't make sense during 202 * handshakes anyway. 203 */ 204 if (s->tlsext_hb_pending) { 205 dtls1_stop_timer(s); 206 s->tlsext_hb_pending = 0; 207 s->tlsext_hb_seq++; 208 } 209#endif 210 211 for (;;) { 212 state = s->state; 213 214 switch (s->state) { 215 case SSL_ST_RENEGOTIATE: 216 s->renegotiate = 1; 217 s->state = SSL_ST_CONNECT; 218 s->ctx->stats.sess_connect_renegotiate++; 219 /* break */ 220 case SSL_ST_BEFORE: 221 case SSL_ST_CONNECT: 222 case SSL_ST_BEFORE | SSL_ST_CONNECT: 223 case SSL_ST_OK | SSL_ST_CONNECT: 224 225 s->server = 0; 226 if (cb != NULL) 227 cb(s, SSL_CB_HANDSHAKE_START, 1); 228 229 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) && 230 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) { 231 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 232 ret = -1; 233 s->state = SSL_ST_ERR; 234 goto end; 235 } 236 237 /* s->version=SSL3_VERSION; */ 238 s->type = SSL_ST_CONNECT; 239 240 if (s->init_buf == NULL) { 241 if ((buf = BUF_MEM_new()) == NULL) { 242 ret = -1; 243 s->state = SSL_ST_ERR; 244 goto end; 245 } 246 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 247 ret = -1; 248 s->state = SSL_ST_ERR; 249 goto end; 250 } 251 s->init_buf = buf; 252 buf = NULL; 253 } 254 255 if (!ssl3_setup_buffers(s)) { 256 ret = -1; 257 s->state = SSL_ST_ERR; 258 goto end; 259 } 260 261 /* setup buffing BIO */ 262 if (!ssl_init_wbio_buffer(s, 0)) { 263 ret = -1; 264 s->state = SSL_ST_ERR; 265 goto end; 266 } 267 268 /* don't push the buffering BIO quite yet */ 269 270 s->state = SSL3_ST_CW_CLNT_HELLO_A; 271 s->ctx->stats.sess_connect++; 272 s->init_num = 0; 273 /* mark client_random uninitialized */ 274 memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); 275 s->d1->send_cookie = 0; 276 s->hit = 0; 277 s->d1->change_cipher_spec_ok = 0; 278 /* 279 * Should have been reset by ssl3_get_finished, too. 280 */ 281 s->s3->change_cipher_spec = 0; 282 break; 283 284#ifndef OPENSSL_NO_SCTP 285 case DTLS1_SCTP_ST_CR_READ_SOCK: 286 287 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 288 s->s3->in_read_app_data = 2; 289 s->rwstate = SSL_READING; 290 BIO_clear_retry_flags(SSL_get_rbio(s)); 291 BIO_set_retry_read(SSL_get_rbio(s)); 292 ret = -1; 293 goto end; 294 } 295 296 s->state = s->s3->tmp.next_state; 297 break; 298 299 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 300 /* read app data until dry event */ 301 302 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 303 if (ret < 0) 304 goto end; 305 306 if (ret == 0) { 307 s->s3->in_read_app_data = 2; 308 s->rwstate = SSL_READING; 309 BIO_clear_retry_flags(SSL_get_rbio(s)); 310 BIO_set_retry_read(SSL_get_rbio(s)); 311 ret = -1; 312 goto end; 313 } 314 315 s->state = s->d1->next_state; 316 break; 317#endif 318 319 case SSL3_ST_CW_CLNT_HELLO_A: 320 s->shutdown = 0; 321 322 /* every DTLS ClientHello resets Finished MAC */ 323 ssl3_init_finished_mac(s); 324 325 case SSL3_ST_CW_CLNT_HELLO_B: 326 dtls1_start_timer(s); 327 ret = ssl3_client_hello(s); 328 if (ret <= 0) 329 goto end; 330 331 if (s->d1->send_cookie) { 332 s->state = SSL3_ST_CW_FLUSH; 333 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 334 } else 335 s->state = SSL3_ST_CR_SRVR_HELLO_A; 336 337 s->init_num = 0; 338 339#ifndef OPENSSL_NO_SCTP 340 /* Disable buffering for SCTP */ 341 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 342#endif 343 /* 344 * turn on buffering for the next lot of output 345 */ 346 if (s->bbio != s->wbio) 347 s->wbio = BIO_push(s->bbio, s->wbio); 348#ifndef OPENSSL_NO_SCTP 349 } 350#endif 351 352 break; 353 354 case SSL3_ST_CR_SRVR_HELLO_A: 355 case SSL3_ST_CR_SRVR_HELLO_B: 356 ret = ssl3_get_server_hello(s); 357 if (ret <= 0) 358 goto end; 359 else { 360 if (s->hit) { 361#ifndef OPENSSL_NO_SCTP 362 /* 363 * Add new shared key for SCTP-Auth, will be ignored if 364 * no SCTP used. 365 */ 366 snprintf((char *)labelbuffer, 367 sizeof(DTLS1_SCTP_AUTH_LABEL), 368 DTLS1_SCTP_AUTH_LABEL); 369 370 if (SSL_export_keying_material(s, sctpauthkey, 371 sizeof(sctpauthkey), 372 labelbuffer, 373 sizeof(labelbuffer), NULL, 0, 374 0) <= 0) { 375 ret = -1; 376 s->state = SSL_ST_ERR; 377 goto end; 378 } 379 380 BIO_ctrl(SSL_get_wbio(s), 381 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 382 sizeof(sctpauthkey), sctpauthkey); 383#endif 384 385 s->state = SSL3_ST_CR_FINISHED_A; 386 if (s->tlsext_ticket_expected) { 387 /* receive renewed session ticket */ 388 s->state = SSL3_ST_CR_SESSION_TICKET_A; 389 } 390 } else 391 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 392 } 393 s->init_num = 0; 394 break; 395 396 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 397 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 398 399 ret = dtls1_get_hello_verify(s); 400 if (ret <= 0) 401 goto end; 402 dtls1_stop_timer(s); 403 if (s->d1->send_cookie) /* start again, with a cookie */ 404 s->state = SSL3_ST_CW_CLNT_HELLO_A; 405 else 406 s->state = SSL3_ST_CR_CERT_A; 407 s->init_num = 0; 408 break; 409 410 case SSL3_ST_CR_CERT_A: 411 case SSL3_ST_CR_CERT_B: 412 /* Check if it is anon DH or PSK */ 413 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 414 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 415 ret = ssl3_get_server_certificate(s); 416 if (ret <= 0) 417 goto end; 418#ifndef OPENSSL_NO_TLSEXT 419 if (s->tlsext_status_expected) 420 s->state = SSL3_ST_CR_CERT_STATUS_A; 421 else 422 s->state = SSL3_ST_CR_KEY_EXCH_A; 423 } else { 424 skip = 1; 425 s->state = SSL3_ST_CR_KEY_EXCH_A; 426 } 427#else 428 } else 429 skip = 1; 430 431 s->state = SSL3_ST_CR_KEY_EXCH_A; 432#endif 433 s->init_num = 0; 434 break; 435 436 case SSL3_ST_CR_KEY_EXCH_A: 437 case SSL3_ST_CR_KEY_EXCH_B: 438 ret = ssl3_get_key_exchange(s); 439 if (ret <= 0) 440 goto end; 441 s->state = SSL3_ST_CR_CERT_REQ_A; 442 s->init_num = 0; 443 444 /* 445 * at this point we check that we have the required stuff from 446 * the server 447 */ 448 if (!ssl3_check_cert_and_algorithm(s)) { 449 ret = -1; 450 s->state = SSL_ST_ERR; 451 goto end; 452 } 453 break; 454 455 case SSL3_ST_CR_CERT_REQ_A: 456 case SSL3_ST_CR_CERT_REQ_B: 457 ret = ssl3_get_certificate_request(s); 458 if (ret <= 0) 459 goto end; 460 s->state = SSL3_ST_CR_SRVR_DONE_A; 461 s->init_num = 0; 462 break; 463 464 case SSL3_ST_CR_SRVR_DONE_A: 465 case SSL3_ST_CR_SRVR_DONE_B: 466 ret = ssl3_get_server_done(s); 467 if (ret <= 0) 468 goto end; 469 dtls1_stop_timer(s); 470 if (s->s3->tmp.cert_req) 471 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 472 else 473 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 474 s->init_num = 0; 475 476#ifndef OPENSSL_NO_SCTP 477 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 478 state == SSL_ST_RENEGOTIATE) 479 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 480 else 481#endif 482 s->state = s->s3->tmp.next_state; 483 break; 484 485 case SSL3_ST_CW_CERT_A: 486 case SSL3_ST_CW_CERT_B: 487 case SSL3_ST_CW_CERT_C: 488 case SSL3_ST_CW_CERT_D: 489 dtls1_start_timer(s); 490 ret = ssl3_send_client_certificate(s); 491 if (ret <= 0) 492 goto end; 493 s->state = SSL3_ST_CW_KEY_EXCH_A; 494 s->init_num = 0; 495 break; 496 497 case SSL3_ST_CW_KEY_EXCH_A: 498 case SSL3_ST_CW_KEY_EXCH_B: 499 dtls1_start_timer(s); 500 ret = ssl3_send_client_key_exchange(s); 501 if (ret <= 0) 502 goto end; 503 504#ifndef OPENSSL_NO_SCTP 505 /* 506 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 507 * used. 508 */ 509 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 510 DTLS1_SCTP_AUTH_LABEL); 511 512 if (SSL_export_keying_material(s, sctpauthkey, 513 sizeof(sctpauthkey), labelbuffer, 514 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 515 ret = -1; 516 s->state = SSL_ST_ERR; 517 goto end; 518 } 519 520 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 521 sizeof(sctpauthkey), sctpauthkey); 522#endif 523 524 /* 525 * EAY EAY EAY need to check for DH fix cert sent back 526 */ 527 /* 528 * For TLS, cert_req is set to 2, so a cert chain of nothing is 529 * sent, but no verify packet is sent 530 */ 531 if (s->s3->tmp.cert_req == 1) { 532 s->state = SSL3_ST_CW_CERT_VRFY_A; 533 } else { 534#ifndef OPENSSL_NO_SCTP 535 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 536 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 537 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 538 } else 539#endif 540 s->state = SSL3_ST_CW_CHANGE_A; 541 } 542 543 s->init_num = 0; 544 break; 545 546 case SSL3_ST_CW_CERT_VRFY_A: 547 case SSL3_ST_CW_CERT_VRFY_B: 548 dtls1_start_timer(s); 549 ret = ssl3_send_client_verify(s); 550 if (ret <= 0) 551 goto end; 552#ifndef OPENSSL_NO_SCTP 553 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 554 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 555 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 556 } else 557#endif 558 s->state = SSL3_ST_CW_CHANGE_A; 559 s->init_num = 0; 560 break; 561 562 case SSL3_ST_CW_CHANGE_A: 563 case SSL3_ST_CW_CHANGE_B: 564 if (!s->hit) 565 dtls1_start_timer(s); 566 ret = dtls1_send_change_cipher_spec(s, 567 SSL3_ST_CW_CHANGE_A, 568 SSL3_ST_CW_CHANGE_B); 569 if (ret <= 0) 570 goto end; 571 572 s->state = SSL3_ST_CW_FINISHED_A; 573 s->init_num = 0; 574 575 s->session->cipher = s->s3->tmp.new_cipher; 576#ifdef OPENSSL_NO_COMP 577 s->session->compress_meth = 0; 578#else 579 if (s->s3->tmp.new_compression == NULL) 580 s->session->compress_meth = 0; 581 else 582 s->session->compress_meth = s->s3->tmp.new_compression->id; 583#endif 584 if (!s->method->ssl3_enc->setup_key_block(s)) { 585 ret = -1; 586 s->state = SSL_ST_ERR; 587 goto end; 588 } 589 590 if (!s->method->ssl3_enc->change_cipher_state(s, 591 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 592 { 593 ret = -1; 594 s->state = SSL_ST_ERR; 595 goto end; 596 } 597#ifndef OPENSSL_NO_SCTP 598 if (s->hit) { 599 /* 600 * Change to new shared key of SCTP-Auth, will be ignored if 601 * no SCTP used. 602 */ 603 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 604 0, NULL); 605 } 606#endif 607 608 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 609 break; 610 611 case SSL3_ST_CW_FINISHED_A: 612 case SSL3_ST_CW_FINISHED_B: 613 if (!s->hit) 614 dtls1_start_timer(s); 615 ret = ssl3_send_finished(s, 616 SSL3_ST_CW_FINISHED_A, 617 SSL3_ST_CW_FINISHED_B, 618 s->method-> 619 ssl3_enc->client_finished_label, 620 s->method-> 621 ssl3_enc->client_finished_label_len); 622 if (ret <= 0) 623 goto end; 624 s->state = SSL3_ST_CW_FLUSH; 625 626 /* clear flags */ 627 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 628 if (s->hit) { 629 s->s3->tmp.next_state = SSL_ST_OK; 630#ifndef OPENSSL_NO_SCTP 631 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 632 s->d1->next_state = s->s3->tmp.next_state; 633 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 634 } 635#endif 636 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 637 s->state = SSL_ST_OK; 638#ifndef OPENSSL_NO_SCTP 639 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 640 s->d1->next_state = SSL_ST_OK; 641 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 642 } 643#endif 644 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 645 s->s3->delay_buf_pop_ret = 0; 646 } 647 } else { 648#ifndef OPENSSL_NO_SCTP 649 /* 650 * Change to new shared key of SCTP-Auth, will be ignored if 651 * no SCTP used. 652 */ 653 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 654 0, NULL); 655#endif 656 657#ifndef OPENSSL_NO_TLSEXT 658 /* 659 * Allow NewSessionTicket if ticket expected 660 */ 661 if (s->tlsext_ticket_expected) 662 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 663 else 664#endif 665 666 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 667 } 668 s->init_num = 0; 669 break; 670 671#ifndef OPENSSL_NO_TLSEXT 672 case SSL3_ST_CR_SESSION_TICKET_A: 673 case SSL3_ST_CR_SESSION_TICKET_B: 674 ret = ssl3_get_new_session_ticket(s); 675 if (ret <= 0) 676 goto end; 677 s->state = SSL3_ST_CR_FINISHED_A; 678 s->init_num = 0; 679 break; 680 681 case SSL3_ST_CR_CERT_STATUS_A: 682 case SSL3_ST_CR_CERT_STATUS_B: 683 ret = ssl3_get_cert_status(s); 684 if (ret <= 0) 685 goto end; 686 s->state = SSL3_ST_CR_KEY_EXCH_A; 687 s->init_num = 0; 688 break; 689#endif 690 691 case SSL3_ST_CR_FINISHED_A: 692 case SSL3_ST_CR_FINISHED_B: 693 s->d1->change_cipher_spec_ok = 1; 694 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 695 SSL3_ST_CR_FINISHED_B); 696 if (ret <= 0) 697 goto end; 698 dtls1_stop_timer(s); 699 700 if (s->hit) 701 s->state = SSL3_ST_CW_CHANGE_A; 702 else 703 s->state = SSL_ST_OK; 704 705#ifndef OPENSSL_NO_SCTP 706 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 707 state == SSL_ST_RENEGOTIATE) { 708 s->d1->next_state = s->state; 709 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 710 } 711#endif 712 713 s->init_num = 0; 714 break; 715 716 case SSL3_ST_CW_FLUSH: 717 s->rwstate = SSL_WRITING; 718 if (BIO_flush(s->wbio) <= 0) { 719 /* 720 * If the write error was fatal, stop trying 721 */ 722 if (!BIO_should_retry(s->wbio)) { 723 s->rwstate = SSL_NOTHING; 724 s->state = s->s3->tmp.next_state; 725 } 726 727 ret = -1; 728 goto end; 729 } 730 s->rwstate = SSL_NOTHING; 731 s->state = s->s3->tmp.next_state; 732 break; 733 734 case SSL_ST_OK: 735 /* clean a few things up */ 736 ssl3_cleanup_key_block(s); 737 738#if 0 739 if (s->init_buf != NULL) { 740 BUF_MEM_free(s->init_buf); 741 s->init_buf = NULL; 742 } 743#endif 744 745 /* 746 * If we are not 'joining' the last two packets, remove the 747 * buffering now 748 */ 749 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 750 ssl_free_wbio_buffer(s); 751 /* else do it later in ssl3_write */ 752 753 s->init_num = 0; 754 s->renegotiate = 0; 755 s->new_session = 0; 756 757 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 758 if (s->hit) 759 s->ctx->stats.sess_hit++; 760 761 ret = 1; 762 /* s->server=0; */ 763 s->handshake_func = dtls1_connect; 764 s->ctx->stats.sess_connect_good++; 765 766 if (cb != NULL) 767 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 768 769 /* done with handshaking */ 770 s->d1->handshake_read_seq = 0; 771 s->d1->next_handshake_write_seq = 0; 772 dtls1_clear_received_buffer(s); 773 goto end; 774 /* break; */ 775 776 case SSL_ST_ERR: 777 default: 778 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 779 ret = -1; 780 goto end; 781 /* break; */ 782 } 783 784 /* did we do anything */ 785 if (!s->s3->tmp.reuse_message && !skip) { 786 if (s->debug) { 787 if ((ret = BIO_flush(s->wbio)) <= 0) 788 goto end; 789 } 790 791 if ((cb != NULL) && (s->state != state)) { 792 new_state = s->state; 793 s->state = state; 794 cb(s, SSL_CB_CONNECT_LOOP, 1); 795 s->state = new_state; 796 } 797 } 798 skip = 0; 799 } 800 end: 801 s->in_handshake--; 802 803#ifndef OPENSSL_NO_SCTP 804 /* 805 * Notify SCTP BIO socket to leave handshake mode and allow stream 806 * identifier other than 0. Will be ignored if no SCTP is used. 807 */ 808 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 809 s->in_handshake, NULL); 810#endif 811 812 if (buf != NULL) 813 BUF_MEM_free(buf); 814 if (cb != NULL) 815 cb(s, SSL_CB_CONNECT_EXIT, ret); 816 return (ret); 817} 818 819static int dtls1_get_hello_verify(SSL *s) 820{ 821 int n, al, ok = 0; 822 unsigned char *data; 823 unsigned int cookie_len; 824 825 s->first_packet = 1; 826 n = s->method->ssl_get_message(s, 827 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 828 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 829 -1, s->max_cert_list, &ok); 830 s->first_packet = 0; 831 832 if (!ok) 833 return ((int)n); 834 835 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 836 s->d1->send_cookie = 0; 837 s->s3->tmp.reuse_message = 1; 838 return (1); 839 } 840 841 data = (unsigned char *)s->init_msg; 842#if 0 843 if (s->method->version != DTLS_ANY_VERSION && 844 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff)))) 845 { 846 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 847 s->version = (s->version & 0xff00) | data[1]; 848 al = SSL_AD_PROTOCOL_VERSION; 849 goto f_err; 850 } 851#endif 852 data += 2; 853 854 cookie_len = *(data++); 855 if (cookie_len > sizeof(s->d1->cookie)) { 856 al = SSL_AD_ILLEGAL_PARAMETER; 857 goto f_err; 858 } 859 860 memcpy(s->d1->cookie, data, cookie_len); 861 s->d1->cookie_len = cookie_len; 862 863 s->d1->send_cookie = 1; 864 return 1; 865 866 f_err: 867 ssl3_send_alert(s, SSL3_AL_FATAL, al); 868 s->state = SSL_ST_ERR; 869 return -1; 870} 871