d1_clnt.c revision 325335
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 if (!ssl3_init_finished_mac(s)) { 324 ret = -1; 325 s->state = SSL_ST_ERR; 326 goto end; 327 } 328 329 /* fall thru */ 330 case SSL3_ST_CW_CLNT_HELLO_B: 331 dtls1_start_timer(s); 332 ret = ssl3_client_hello(s); 333 if (ret <= 0) 334 goto end; 335 336 if (s->d1->send_cookie) { 337 s->state = SSL3_ST_CW_FLUSH; 338 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 339 } else 340 s->state = SSL3_ST_CR_SRVR_HELLO_A; 341 342 s->init_num = 0; 343 344#ifndef OPENSSL_NO_SCTP 345 /* Disable buffering for SCTP */ 346 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 347#endif 348 /* 349 * turn on buffering for the next lot of output 350 */ 351 if (s->bbio != s->wbio) 352 s->wbio = BIO_push(s->bbio, s->wbio); 353#ifndef OPENSSL_NO_SCTP 354 } 355#endif 356 357 break; 358 359 case SSL3_ST_CR_SRVR_HELLO_A: 360 case SSL3_ST_CR_SRVR_HELLO_B: 361 ret = ssl3_get_server_hello(s); 362 if (ret <= 0) 363 goto end; 364 else { 365 if (s->hit) { 366#ifndef OPENSSL_NO_SCTP 367 /* 368 * Add new shared key for SCTP-Auth, will be ignored if 369 * no SCTP used. 370 */ 371 snprintf((char *)labelbuffer, 372 sizeof(DTLS1_SCTP_AUTH_LABEL), 373 DTLS1_SCTP_AUTH_LABEL); 374 375 if (SSL_export_keying_material(s, sctpauthkey, 376 sizeof(sctpauthkey), 377 labelbuffer, 378 sizeof(labelbuffer), NULL, 0, 379 0) <= 0) { 380 ret = -1; 381 s->state = SSL_ST_ERR; 382 goto end; 383 } 384 385 BIO_ctrl(SSL_get_wbio(s), 386 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 387 sizeof(sctpauthkey), sctpauthkey); 388#endif 389 390 s->state = SSL3_ST_CR_FINISHED_A; 391 if (s->tlsext_ticket_expected) { 392 /* receive renewed session ticket */ 393 s->state = SSL3_ST_CR_SESSION_TICKET_A; 394 } 395 } else 396 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 397 } 398 s->init_num = 0; 399 break; 400 401 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 402 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 403 404 ret = dtls1_get_hello_verify(s); 405 if (ret <= 0) 406 goto end; 407 dtls1_stop_timer(s); 408 if (s->d1->send_cookie) /* start again, with a cookie */ 409 s->state = SSL3_ST_CW_CLNT_HELLO_A; 410 else 411 s->state = SSL3_ST_CR_CERT_A; 412 s->init_num = 0; 413 break; 414 415 case SSL3_ST_CR_CERT_A: 416 case SSL3_ST_CR_CERT_B: 417 /* Check if it is anon DH or PSK */ 418 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 419 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 420 ret = ssl3_get_server_certificate(s); 421 if (ret <= 0) 422 goto end; 423#ifndef OPENSSL_NO_TLSEXT 424 if (s->tlsext_status_expected) 425 s->state = SSL3_ST_CR_CERT_STATUS_A; 426 else 427 s->state = SSL3_ST_CR_KEY_EXCH_A; 428 } else { 429 skip = 1; 430 s->state = SSL3_ST_CR_KEY_EXCH_A; 431 } 432#else 433 } else 434 skip = 1; 435 436 s->state = SSL3_ST_CR_KEY_EXCH_A; 437#endif 438 s->init_num = 0; 439 break; 440 441 case SSL3_ST_CR_KEY_EXCH_A: 442 case SSL3_ST_CR_KEY_EXCH_B: 443 ret = ssl3_get_key_exchange(s); 444 if (ret <= 0) 445 goto end; 446 s->state = SSL3_ST_CR_CERT_REQ_A; 447 s->init_num = 0; 448 449 /* 450 * at this point we check that we have the required stuff from 451 * the server 452 */ 453 if (!ssl3_check_cert_and_algorithm(s)) { 454 ret = -1; 455 s->state = SSL_ST_ERR; 456 goto end; 457 } 458 break; 459 460 case SSL3_ST_CR_CERT_REQ_A: 461 case SSL3_ST_CR_CERT_REQ_B: 462 ret = ssl3_get_certificate_request(s); 463 if (ret <= 0) 464 goto end; 465 s->state = SSL3_ST_CR_SRVR_DONE_A; 466 s->init_num = 0; 467 break; 468 469 case SSL3_ST_CR_SRVR_DONE_A: 470 case SSL3_ST_CR_SRVR_DONE_B: 471 ret = ssl3_get_server_done(s); 472 if (ret <= 0) 473 goto end; 474 dtls1_stop_timer(s); 475 if (s->s3->tmp.cert_req) 476 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 477 else 478 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 479 s->init_num = 0; 480 481#ifndef OPENSSL_NO_SCTP 482 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 483 state == SSL_ST_RENEGOTIATE) 484 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 485 else 486#endif 487 s->state = s->s3->tmp.next_state; 488 break; 489 490 case SSL3_ST_CW_CERT_A: 491 case SSL3_ST_CW_CERT_B: 492 case SSL3_ST_CW_CERT_C: 493 case SSL3_ST_CW_CERT_D: 494 dtls1_start_timer(s); 495 ret = ssl3_send_client_certificate(s); 496 if (ret <= 0) 497 goto end; 498 s->state = SSL3_ST_CW_KEY_EXCH_A; 499 s->init_num = 0; 500 break; 501 502 case SSL3_ST_CW_KEY_EXCH_A: 503 case SSL3_ST_CW_KEY_EXCH_B: 504 dtls1_start_timer(s); 505 ret = ssl3_send_client_key_exchange(s); 506 if (ret <= 0) 507 goto end; 508 509#ifndef OPENSSL_NO_SCTP 510 /* 511 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 512 * used. 513 */ 514 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 515 DTLS1_SCTP_AUTH_LABEL); 516 517 if (SSL_export_keying_material(s, sctpauthkey, 518 sizeof(sctpauthkey), labelbuffer, 519 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 520 ret = -1; 521 s->state = SSL_ST_ERR; 522 goto end; 523 } 524 525 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 526 sizeof(sctpauthkey), sctpauthkey); 527#endif 528 529 /* 530 * EAY EAY EAY need to check for DH fix cert sent back 531 */ 532 /* 533 * For TLS, cert_req is set to 2, so a cert chain of nothing is 534 * sent, but no verify packet is sent 535 */ 536 if (s->s3->tmp.cert_req == 1) { 537 s->state = SSL3_ST_CW_CERT_VRFY_A; 538 } else { 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 } 547 548 s->init_num = 0; 549 break; 550 551 case SSL3_ST_CW_CERT_VRFY_A: 552 case SSL3_ST_CW_CERT_VRFY_B: 553 dtls1_start_timer(s); 554 ret = ssl3_send_client_verify(s); 555 if (ret <= 0) 556 goto end; 557#ifndef OPENSSL_NO_SCTP 558 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 559 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 560 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 561 } else 562#endif 563 s->state = SSL3_ST_CW_CHANGE_A; 564 s->init_num = 0; 565 break; 566 567 case SSL3_ST_CW_CHANGE_A: 568 case SSL3_ST_CW_CHANGE_B: 569 if (!s->hit) 570 dtls1_start_timer(s); 571 ret = dtls1_send_change_cipher_spec(s, 572 SSL3_ST_CW_CHANGE_A, 573 SSL3_ST_CW_CHANGE_B); 574 if (ret <= 0) 575 goto end; 576 577 s->state = SSL3_ST_CW_FINISHED_A; 578 s->init_num = 0; 579 580 s->session->cipher = s->s3->tmp.new_cipher; 581#ifdef OPENSSL_NO_COMP 582 s->session->compress_meth = 0; 583#else 584 if (s->s3->tmp.new_compression == NULL) 585 s->session->compress_meth = 0; 586 else 587 s->session->compress_meth = s->s3->tmp.new_compression->id; 588#endif 589 if (!s->method->ssl3_enc->setup_key_block(s)) { 590 ret = -1; 591 s->state = SSL_ST_ERR; 592 goto end; 593 } 594 595 if (!s->method->ssl3_enc->change_cipher_state(s, 596 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 597 { 598 ret = -1; 599 s->state = SSL_ST_ERR; 600 goto end; 601 } 602#ifndef OPENSSL_NO_SCTP 603 if (s->hit) { 604 /* 605 * Change to new shared key of SCTP-Auth, will be ignored if 606 * no SCTP used. 607 */ 608 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 609 0, NULL); 610 } 611#endif 612 613 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 614 break; 615 616 case SSL3_ST_CW_FINISHED_A: 617 case SSL3_ST_CW_FINISHED_B: 618 if (!s->hit) 619 dtls1_start_timer(s); 620 ret = ssl3_send_finished(s, 621 SSL3_ST_CW_FINISHED_A, 622 SSL3_ST_CW_FINISHED_B, 623 s->method-> 624 ssl3_enc->client_finished_label, 625 s->method-> 626 ssl3_enc->client_finished_label_len); 627 if (ret <= 0) 628 goto end; 629 s->state = SSL3_ST_CW_FLUSH; 630 631 /* clear flags */ 632 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 633 if (s->hit) { 634 s->s3->tmp.next_state = SSL_ST_OK; 635#ifndef OPENSSL_NO_SCTP 636 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 637 s->d1->next_state = s->s3->tmp.next_state; 638 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 639 } 640#endif 641 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 642 s->state = SSL_ST_OK; 643#ifndef OPENSSL_NO_SCTP 644 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 645 s->d1->next_state = SSL_ST_OK; 646 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 647 } 648#endif 649 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 650 s->s3->delay_buf_pop_ret = 0; 651 } 652 } else { 653#ifndef OPENSSL_NO_SCTP 654 /* 655 * Change to new shared key of SCTP-Auth, will be ignored if 656 * no SCTP used. 657 */ 658 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 659 0, NULL); 660#endif 661 662#ifndef OPENSSL_NO_TLSEXT 663 /* 664 * Allow NewSessionTicket if ticket expected 665 */ 666 if (s->tlsext_ticket_expected) 667 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 668 else 669#endif 670 671 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 672 } 673 s->init_num = 0; 674 break; 675 676#ifndef OPENSSL_NO_TLSEXT 677 case SSL3_ST_CR_SESSION_TICKET_A: 678 case SSL3_ST_CR_SESSION_TICKET_B: 679 ret = ssl3_get_new_session_ticket(s); 680 if (ret <= 0) 681 goto end; 682 s->state = SSL3_ST_CR_FINISHED_A; 683 s->init_num = 0; 684 break; 685 686 case SSL3_ST_CR_CERT_STATUS_A: 687 case SSL3_ST_CR_CERT_STATUS_B: 688 ret = ssl3_get_cert_status(s); 689 if (ret <= 0) 690 goto end; 691 s->state = SSL3_ST_CR_KEY_EXCH_A; 692 s->init_num = 0; 693 break; 694#endif 695 696 case SSL3_ST_CR_FINISHED_A: 697 case SSL3_ST_CR_FINISHED_B: 698 s->d1->change_cipher_spec_ok = 1; 699 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 700 SSL3_ST_CR_FINISHED_B); 701 if (ret <= 0) 702 goto end; 703 dtls1_stop_timer(s); 704 705 if (s->hit) 706 s->state = SSL3_ST_CW_CHANGE_A; 707 else 708 s->state = SSL_ST_OK; 709 710#ifndef OPENSSL_NO_SCTP 711 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 712 state == SSL_ST_RENEGOTIATE) { 713 s->d1->next_state = s->state; 714 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 715 } 716#endif 717 718 s->init_num = 0; 719 break; 720 721 case SSL3_ST_CW_FLUSH: 722 s->rwstate = SSL_WRITING; 723 if (BIO_flush(s->wbio) <= 0) { 724 /* 725 * If the write error was fatal, stop trying 726 */ 727 if (!BIO_should_retry(s->wbio)) { 728 s->rwstate = SSL_NOTHING; 729 s->state = s->s3->tmp.next_state; 730 } 731 732 ret = -1; 733 goto end; 734 } 735 s->rwstate = SSL_NOTHING; 736 s->state = s->s3->tmp.next_state; 737 break; 738 739 case SSL_ST_OK: 740 /* clean a few things up */ 741 ssl3_cleanup_key_block(s); 742 743#if 0 744 if (s->init_buf != NULL) { 745 BUF_MEM_free(s->init_buf); 746 s->init_buf = NULL; 747 } 748#endif 749 750 /* 751 * If we are not 'joining' the last two packets, remove the 752 * buffering now 753 */ 754 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 755 ssl_free_wbio_buffer(s); 756 /* else do it later in ssl3_write */ 757 758 s->init_num = 0; 759 s->renegotiate = 0; 760 s->new_session = 0; 761 762 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 763 if (s->hit) 764 s->ctx->stats.sess_hit++; 765 766 ret = 1; 767 /* s->server=0; */ 768 s->handshake_func = dtls1_connect; 769 s->ctx->stats.sess_connect_good++; 770 771 if (cb != NULL) 772 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 773 774 /* done with handshaking */ 775 s->d1->handshake_read_seq = 0; 776 s->d1->next_handshake_write_seq = 0; 777 dtls1_clear_received_buffer(s); 778 goto end; 779 /* break; */ 780 781 case SSL_ST_ERR: 782 default: 783 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 784 ret = -1; 785 goto end; 786 /* break; */ 787 } 788 789 /* did we do anything */ 790 if (!s->s3->tmp.reuse_message && !skip) { 791 if (s->debug) { 792 if ((ret = BIO_flush(s->wbio)) <= 0) 793 goto end; 794 } 795 796 if ((cb != NULL) && (s->state != state)) { 797 new_state = s->state; 798 s->state = state; 799 cb(s, SSL_CB_CONNECT_LOOP, 1); 800 s->state = new_state; 801 } 802 } 803 skip = 0; 804 } 805 end: 806 s->in_handshake--; 807 808#ifndef OPENSSL_NO_SCTP 809 /* 810 * Notify SCTP BIO socket to leave handshake mode and allow stream 811 * identifier other than 0. Will be ignored if no SCTP is used. 812 */ 813 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 814 s->in_handshake, NULL); 815#endif 816 817 if (buf != NULL) 818 BUF_MEM_free(buf); 819 if (cb != NULL) 820 cb(s, SSL_CB_CONNECT_EXIT, ret); 821 return (ret); 822} 823 824static int dtls1_get_hello_verify(SSL *s) 825{ 826 int n, al, ok = 0; 827 unsigned char *data; 828 unsigned int cookie_len; 829 830 s->first_packet = 1; 831 n = s->method->ssl_get_message(s, 832 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 833 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 834 -1, s->max_cert_list, &ok); 835 s->first_packet = 0; 836 837 if (!ok) 838 return ((int)n); 839 840 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 841 s->d1->send_cookie = 0; 842 s->s3->tmp.reuse_message = 1; 843 return (1); 844 } 845 846 data = (unsigned char *)s->init_msg; 847#if 0 848 if (s->method->version != DTLS_ANY_VERSION && 849 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff)))) 850 { 851 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 852 s->version = (s->version & 0xff00) | data[1]; 853 al = SSL_AD_PROTOCOL_VERSION; 854 goto f_err; 855 } 856#endif 857 data += 2; 858 859 cookie_len = *(data++); 860 if (cookie_len > sizeof(s->d1->cookie)) { 861 al = SSL_AD_ILLEGAL_PARAMETER; 862 goto f_err; 863 } 864 865 memcpy(s->d1->cookie, data, cookie_len); 866 s->d1->cookie_len = cookie_len; 867 868 s->d1->send_cookie = 1; 869 return 1; 870 871 f_err: 872 ssl3_send_alert(s, SSL3_AL_FATAL, al); 873 s->state = SSL_ST_ERR; 874 return -1; 875} 876