d1_clnt.c revision 296341
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 139 return (NULL); 140} 141 142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, dtls1_get_client_method) 145 146int dtls1_connect(SSL *s) 147{ 148 BUF_MEM *buf = NULL; 149 unsigned long Time = (unsigned long)time(NULL); 150 void (*cb) (const SSL *ssl, int type, int val) = NULL; 151 int ret = -1; 152 int new_state, state, skip = 0; 153#ifndef OPENSSL_NO_SCTP 154 unsigned char sctpauthkey[64]; 155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 156#endif 157 158 RAND_add(&Time, sizeof(Time), 0); 159 ERR_clear_error(); 160 clear_sys_error(); 161 162 if (s->info_callback != NULL) 163 cb = s->info_callback; 164 else if (s->ctx->info_callback != NULL) 165 cb = s->ctx->info_callback; 166 167 s->in_handshake++; 168 if (!SSL_in_init(s) || SSL_in_before(s)) 169 SSL_clear(s); 170 171#ifndef OPENSSL_NO_SCTP 172 /* 173 * Notify SCTP BIO socket to enter handshake mode and prevent stream 174 * identifier other than 0. Will be ignored if no SCTP is used. 175 */ 176 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 177 s->in_handshake, NULL); 178#endif 179 180#ifndef OPENSSL_NO_HEARTBEATS 181 /* 182 * If we're awaiting a HeartbeatResponse, pretend we already got and 183 * don't await it anymore, because Heartbeats don't make sense during 184 * handshakes anyway. 185 */ 186 if (s->tlsext_hb_pending) { 187 dtls1_stop_timer(s); 188 s->tlsext_hb_pending = 0; 189 s->tlsext_hb_seq++; 190 } 191#endif 192 193 for (;;) { 194 state = s->state; 195 196 switch (s->state) { 197 case SSL_ST_RENEGOTIATE: 198 s->renegotiate = 1; 199 s->state = SSL_ST_CONNECT; 200 s->ctx->stats.sess_connect_renegotiate++; 201 /* break */ 202 case SSL_ST_BEFORE: 203 case SSL_ST_CONNECT: 204 case SSL_ST_BEFORE | SSL_ST_CONNECT: 205 case SSL_ST_OK | SSL_ST_CONNECT: 206 207 s->server = 0; 208 if (cb != NULL) 209 cb(s, SSL_CB_HANDSHAKE_START, 1); 210 211 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) && 212 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) { 213 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 214 ret = -1; 215 s->state = SSL_ST_ERR; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->type = SSL_ST_CONNECT; 221 222 if (s->init_buf == NULL) { 223 if ((buf = BUF_MEM_new()) == NULL) { 224 ret = -1; 225 s->state = SSL_ST_ERR; 226 goto end; 227 } 228 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 229 ret = -1; 230 s->state = SSL_ST_ERR; 231 goto end; 232 } 233 s->init_buf = buf; 234 buf = NULL; 235 } 236 237 if (!ssl3_setup_buffers(s)) { 238 ret = -1; 239 s->state = SSL_ST_ERR; 240 goto end; 241 } 242 243 /* setup buffing BIO */ 244 if (!ssl_init_wbio_buffer(s, 0)) { 245 ret = -1; 246 s->state = SSL_ST_ERR; 247 goto end; 248 } 249 250 /* don't push the buffering BIO quite yet */ 251 252 s->state = SSL3_ST_CW_CLNT_HELLO_A; 253 s->ctx->stats.sess_connect++; 254 s->init_num = 0; 255 /* mark client_random uninitialized */ 256 memset(s->s3->client_random, 0, sizeof(s->s3->client_random)); 257 s->d1->send_cookie = 0; 258 s->hit = 0; 259 s->d1->change_cipher_spec_ok = 0; 260 /* 261 * Should have been reset by ssl3_get_finished, too. 262 */ 263 s->s3->change_cipher_spec = 0; 264 break; 265 266#ifndef OPENSSL_NO_SCTP 267 case DTLS1_SCTP_ST_CR_READ_SOCK: 268 269 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 270 s->s3->in_read_app_data = 2; 271 s->rwstate = SSL_READING; 272 BIO_clear_retry_flags(SSL_get_rbio(s)); 273 BIO_set_retry_read(SSL_get_rbio(s)); 274 ret = -1; 275 goto end; 276 } 277 278 s->state = s->s3->tmp.next_state; 279 break; 280 281 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 282 /* read app data until dry event */ 283 284 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 285 if (ret < 0) 286 goto end; 287 288 if (ret == 0) { 289 s->s3->in_read_app_data = 2; 290 s->rwstate = SSL_READING; 291 BIO_clear_retry_flags(SSL_get_rbio(s)); 292 BIO_set_retry_read(SSL_get_rbio(s)); 293 ret = -1; 294 goto end; 295 } 296 297 s->state = s->d1->next_state; 298 break; 299#endif 300 301 case SSL3_ST_CW_CLNT_HELLO_A: 302 case SSL3_ST_CW_CLNT_HELLO_B: 303 304 s->shutdown = 0; 305 306 /* every DTLS ClientHello resets Finished MAC */ 307 ssl3_init_finished_mac(s); 308 309 dtls1_start_timer(s); 310 ret = dtls1_client_hello(s); 311 if (ret <= 0) 312 goto end; 313 314 if (s->d1->send_cookie) { 315 s->state = SSL3_ST_CW_FLUSH; 316 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A; 317 } else 318 s->state = SSL3_ST_CR_SRVR_HELLO_A; 319 320 s->init_num = 0; 321 322#ifndef OPENSSL_NO_SCTP 323 /* Disable buffering for SCTP */ 324 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) { 325#endif 326 /* 327 * turn on buffering for the next lot of output 328 */ 329 if (s->bbio != s->wbio) 330 s->wbio = BIO_push(s->bbio, s->wbio); 331#ifndef OPENSSL_NO_SCTP 332 } 333#endif 334 335 break; 336 337 case SSL3_ST_CR_SRVR_HELLO_A: 338 case SSL3_ST_CR_SRVR_HELLO_B: 339 ret = ssl3_get_server_hello(s); 340 if (ret <= 0) 341 goto end; 342 else { 343 if (s->hit) { 344#ifndef OPENSSL_NO_SCTP 345 /* 346 * Add new shared key for SCTP-Auth, will be ignored if 347 * no SCTP used. 348 */ 349 snprintf((char *)labelbuffer, 350 sizeof(DTLS1_SCTP_AUTH_LABEL), 351 DTLS1_SCTP_AUTH_LABEL); 352 353 SSL_export_keying_material(s, sctpauthkey, 354 sizeof(sctpauthkey), 355 labelbuffer, 356 sizeof(labelbuffer), NULL, 0, 357 0); 358 359 BIO_ctrl(SSL_get_wbio(s), 360 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 361 sizeof(sctpauthkey), sctpauthkey); 362#endif 363 364 s->state = SSL3_ST_CR_FINISHED_A; 365 } else 366 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 367 } 368 s->init_num = 0; 369 break; 370 371 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 372 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 373 374 ret = dtls1_get_hello_verify(s); 375 if (ret <= 0) 376 goto end; 377 dtls1_stop_timer(s); 378 if (s->d1->send_cookie) /* start again, with a cookie */ 379 s->state = SSL3_ST_CW_CLNT_HELLO_A; 380 else 381 s->state = SSL3_ST_CR_CERT_A; 382 s->init_num = 0; 383 break; 384 385 case SSL3_ST_CR_CERT_A: 386 case SSL3_ST_CR_CERT_B: 387 /* Check if it is anon DH or PSK */ 388 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 389 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 390 ret = ssl3_get_server_certificate(s); 391 if (ret <= 0) 392 goto end; 393#ifndef OPENSSL_NO_TLSEXT 394 if (s->tlsext_status_expected) 395 s->state = SSL3_ST_CR_CERT_STATUS_A; 396 else 397 s->state = SSL3_ST_CR_KEY_EXCH_A; 398 } else { 399 skip = 1; 400 s->state = SSL3_ST_CR_KEY_EXCH_A; 401 } 402#else 403 } else 404 skip = 1; 405 406 s->state = SSL3_ST_CR_KEY_EXCH_A; 407#endif 408 s->init_num = 0; 409 break; 410 411 case SSL3_ST_CR_KEY_EXCH_A: 412 case SSL3_ST_CR_KEY_EXCH_B: 413 ret = ssl3_get_key_exchange(s); 414 if (ret <= 0) 415 goto end; 416 s->state = SSL3_ST_CR_CERT_REQ_A; 417 s->init_num = 0; 418 419 /* 420 * at this point we check that we have the required stuff from 421 * the server 422 */ 423 if (!ssl3_check_cert_and_algorithm(s)) { 424 ret = -1; 425 s->state = SSL_ST_ERR; 426 goto end; 427 } 428 break; 429 430 case SSL3_ST_CR_CERT_REQ_A: 431 case SSL3_ST_CR_CERT_REQ_B: 432 ret = ssl3_get_certificate_request(s); 433 if (ret <= 0) 434 goto end; 435 s->state = SSL3_ST_CR_SRVR_DONE_A; 436 s->init_num = 0; 437 break; 438 439 case SSL3_ST_CR_SRVR_DONE_A: 440 case SSL3_ST_CR_SRVR_DONE_B: 441 ret = ssl3_get_server_done(s); 442 if (ret <= 0) 443 goto end; 444 dtls1_stop_timer(s); 445 if (s->s3->tmp.cert_req) 446 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A; 447 else 448 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A; 449 s->init_num = 0; 450 451#ifndef OPENSSL_NO_SCTP 452 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 453 state == SSL_ST_RENEGOTIATE) 454 s->state = DTLS1_SCTP_ST_CR_READ_SOCK; 455 else 456#endif 457 s->state = s->s3->tmp.next_state; 458 break; 459 460 case SSL3_ST_CW_CERT_A: 461 case SSL3_ST_CW_CERT_B: 462 case SSL3_ST_CW_CERT_C: 463 case SSL3_ST_CW_CERT_D: 464 dtls1_start_timer(s); 465 ret = dtls1_send_client_certificate(s); 466 if (ret <= 0) 467 goto end; 468 s->state = SSL3_ST_CW_KEY_EXCH_A; 469 s->init_num = 0; 470 break; 471 472 case SSL3_ST_CW_KEY_EXCH_A: 473 case SSL3_ST_CW_KEY_EXCH_B: 474 dtls1_start_timer(s); 475 ret = dtls1_send_client_key_exchange(s); 476 if (ret <= 0) 477 goto end; 478 479#ifndef OPENSSL_NO_SCTP 480 /* 481 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 482 * used. 483 */ 484 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 485 DTLS1_SCTP_AUTH_LABEL); 486 487 SSL_export_keying_material(s, sctpauthkey, 488 sizeof(sctpauthkey), labelbuffer, 489 sizeof(labelbuffer), NULL, 0, 0); 490 491 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 492 sizeof(sctpauthkey), sctpauthkey); 493#endif 494 495 /* 496 * EAY EAY EAY need to check for DH fix cert sent back 497 */ 498 /* 499 * For TLS, cert_req is set to 2, so a cert chain of nothing is 500 * sent, but no verify packet is sent 501 */ 502 if (s->s3->tmp.cert_req == 1) { 503 s->state = SSL3_ST_CW_CERT_VRFY_A; 504 } else { 505#ifndef OPENSSL_NO_SCTP 506 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 507 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 508 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 509 } else 510#endif 511 s->state = SSL3_ST_CW_CHANGE_A; 512 } 513 514 s->init_num = 0; 515 break; 516 517 case SSL3_ST_CW_CERT_VRFY_A: 518 case SSL3_ST_CW_CERT_VRFY_B: 519 dtls1_start_timer(s); 520 ret = dtls1_send_client_verify(s); 521 if (ret <= 0) 522 goto end; 523#ifndef OPENSSL_NO_SCTP 524 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 525 s->d1->next_state = SSL3_ST_CW_CHANGE_A; 526 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 527 } else 528#endif 529 s->state = SSL3_ST_CW_CHANGE_A; 530 s->init_num = 0; 531 break; 532 533 case SSL3_ST_CW_CHANGE_A: 534 case SSL3_ST_CW_CHANGE_B: 535 if (!s->hit) 536 dtls1_start_timer(s); 537 ret = dtls1_send_change_cipher_spec(s, 538 SSL3_ST_CW_CHANGE_A, 539 SSL3_ST_CW_CHANGE_B); 540 if (ret <= 0) 541 goto end; 542 543 s->state = SSL3_ST_CW_FINISHED_A; 544 s->init_num = 0; 545 546 s->session->cipher = s->s3->tmp.new_cipher; 547#ifdef OPENSSL_NO_COMP 548 s->session->compress_meth = 0; 549#else 550 if (s->s3->tmp.new_compression == NULL) 551 s->session->compress_meth = 0; 552 else 553 s->session->compress_meth = s->s3->tmp.new_compression->id; 554#endif 555 if (!s->method->ssl3_enc->setup_key_block(s)) { 556 ret = -1; 557 s->state = SSL_ST_ERR; 558 goto end; 559 } 560 561 if (!s->method->ssl3_enc->change_cipher_state(s, 562 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 563 { 564 ret = -1; 565 s->state = SSL_ST_ERR; 566 goto end; 567 } 568#ifndef OPENSSL_NO_SCTP 569 if (s->hit) { 570 /* 571 * Change to new shared key of SCTP-Auth, will be ignored if 572 * no SCTP used. 573 */ 574 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 575 0, NULL); 576 } 577#endif 578 579 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 580 break; 581 582 case SSL3_ST_CW_FINISHED_A: 583 case SSL3_ST_CW_FINISHED_B: 584 if (!s->hit) 585 dtls1_start_timer(s); 586 ret = dtls1_send_finished(s, 587 SSL3_ST_CW_FINISHED_A, 588 SSL3_ST_CW_FINISHED_B, 589 s->method-> 590 ssl3_enc->client_finished_label, 591 s->method-> 592 ssl3_enc->client_finished_label_len); 593 if (ret <= 0) 594 goto end; 595 s->state = SSL3_ST_CW_FLUSH; 596 597 /* clear flags */ 598 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 599 if (s->hit) { 600 s->s3->tmp.next_state = SSL_ST_OK; 601#ifndef OPENSSL_NO_SCTP 602 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 603 s->d1->next_state = s->s3->tmp.next_state; 604 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 605 } 606#endif 607 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 608 s->state = SSL_ST_OK; 609#ifndef OPENSSL_NO_SCTP 610 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 611 s->d1->next_state = SSL_ST_OK; 612 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 613 } 614#endif 615 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 616 s->s3->delay_buf_pop_ret = 0; 617 } 618 } else { 619#ifndef OPENSSL_NO_SCTP 620 /* 621 * Change to new shared key of SCTP-Auth, will be ignored if 622 * no SCTP used. 623 */ 624 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 625 0, NULL); 626#endif 627 628#ifndef OPENSSL_NO_TLSEXT 629 /* 630 * Allow NewSessionTicket if ticket expected 631 */ 632 if (s->tlsext_ticket_expected) 633 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 634 else 635#endif 636 637 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 638 } 639 s->init_num = 0; 640 break; 641 642#ifndef OPENSSL_NO_TLSEXT 643 case SSL3_ST_CR_SESSION_TICKET_A: 644 case SSL3_ST_CR_SESSION_TICKET_B: 645 ret = ssl3_get_new_session_ticket(s); 646 if (ret <= 0) 647 goto end; 648 s->state = SSL3_ST_CR_FINISHED_A; 649 s->init_num = 0; 650 break; 651 652 case SSL3_ST_CR_CERT_STATUS_A: 653 case SSL3_ST_CR_CERT_STATUS_B: 654 ret = ssl3_get_cert_status(s); 655 if (ret <= 0) 656 goto end; 657 s->state = SSL3_ST_CR_KEY_EXCH_A; 658 s->init_num = 0; 659 break; 660#endif 661 662 case SSL3_ST_CR_FINISHED_A: 663 case SSL3_ST_CR_FINISHED_B: 664 s->d1->change_cipher_spec_ok = 1; 665 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 666 SSL3_ST_CR_FINISHED_B); 667 if (ret <= 0) 668 goto end; 669 dtls1_stop_timer(s); 670 671 if (s->hit) 672 s->state = SSL3_ST_CW_CHANGE_A; 673 else 674 s->state = SSL_ST_OK; 675 676#ifndef OPENSSL_NO_SCTP 677 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 678 state == SSL_ST_RENEGOTIATE) { 679 s->d1->next_state = s->state; 680 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK; 681 } 682#endif 683 684 s->init_num = 0; 685 break; 686 687 case SSL3_ST_CW_FLUSH: 688 s->rwstate = SSL_WRITING; 689 if (BIO_flush(s->wbio) <= 0) { 690 /* 691 * If the write error was fatal, stop trying 692 */ 693 if (!BIO_should_retry(s->wbio)) { 694 s->rwstate = SSL_NOTHING; 695 s->state = s->s3->tmp.next_state; 696 } 697 698 ret = -1; 699 goto end; 700 } 701 s->rwstate = SSL_NOTHING; 702 s->state = s->s3->tmp.next_state; 703 break; 704 705 case SSL_ST_OK: 706 /* clean a few things up */ 707 ssl3_cleanup_key_block(s); 708 709#if 0 710 if (s->init_buf != NULL) { 711 BUF_MEM_free(s->init_buf); 712 s->init_buf = NULL; 713 } 714#endif 715 716 /* 717 * If we are not 'joining' the last two packets, remove the 718 * buffering now 719 */ 720 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 721 ssl_free_wbio_buffer(s); 722 /* else do it later in ssl3_write */ 723 724 s->init_num = 0; 725 s->renegotiate = 0; 726 s->new_session = 0; 727 728 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 729 if (s->hit) 730 s->ctx->stats.sess_hit++; 731 732 ret = 1; 733 /* s->server=0; */ 734 s->handshake_func = dtls1_connect; 735 s->ctx->stats.sess_connect_good++; 736 737 if (cb != NULL) 738 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 739 740 /* done with handshaking */ 741 s->d1->handshake_read_seq = 0; 742 s->d1->next_handshake_write_seq = 0; 743 goto end; 744 /* break; */ 745 746 case SSL_ST_ERR: 747 default: 748 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE); 749 ret = -1; 750 goto end; 751 /* break; */ 752 } 753 754 /* did we do anything */ 755 if (!s->s3->tmp.reuse_message && !skip) { 756 if (s->debug) { 757 if ((ret = BIO_flush(s->wbio)) <= 0) 758 goto end; 759 } 760 761 if ((cb != NULL) && (s->state != state)) { 762 new_state = s->state; 763 s->state = state; 764 cb(s, SSL_CB_CONNECT_LOOP, 1); 765 s->state = new_state; 766 } 767 } 768 skip = 0; 769 } 770 end: 771 s->in_handshake--; 772 773#ifndef OPENSSL_NO_SCTP 774 /* 775 * Notify SCTP BIO socket to leave handshake mode and allow stream 776 * identifier other than 0. Will be ignored if no SCTP is used. 777 */ 778 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 779 s->in_handshake, NULL); 780#endif 781 782 if (buf != NULL) 783 BUF_MEM_free(buf); 784 if (cb != NULL) 785 cb(s, SSL_CB_CONNECT_EXIT, ret); 786 return (ret); 787} 788 789int dtls1_client_hello(SSL *s) 790{ 791 unsigned char *buf; 792 unsigned char *p, *d; 793 unsigned int i, j; 794 unsigned long l; 795 SSL_COMP *comp; 796 797 buf = (unsigned char *)s->init_buf->data; 798 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 799 SSL_SESSION *sess = s->session; 800 if ((s->session == NULL) || (s->session->ssl_version != s->version) || 801#ifdef OPENSSL_NO_TLSEXT 802 !sess->session_id_length || 803#else 804 (!sess->session_id_length && !sess->tlsext_tick) || 805#endif 806 (s->session->not_resumable)) { 807 if (!ssl_get_new_session(s, 0)) 808 goto err; 809 } 810 /* else use the pre-loaded session */ 811 812 p = s->s3->client_random; 813 814 /* 815 * if client_random is initialized, reuse it, we are required to use 816 * same upon reply to HelloVerify 817 */ 818 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ; 819 if (i == sizeof(s->s3->client_random)) 820 ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)); 821 822 /* Do the message type and length last */ 823 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 824 825 *(p++) = s->version >> 8; 826 *(p++) = s->version & 0xff; 827 s->client_version = s->version; 828 829 /* Random stuff */ 830 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 831 p += SSL3_RANDOM_SIZE; 832 833 /* Session ID */ 834 if (s->new_session) 835 i = 0; 836 else 837 i = s->session->session_id_length; 838 *(p++) = i; 839 if (i != 0) { 840 if (i > sizeof s->session->session_id) { 841 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 842 goto err; 843 } 844 memcpy(p, s->session->session_id, i); 845 p += i; 846 } 847 848 /* cookie stuff */ 849 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 850 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 851 goto err; 852 } 853 *(p++) = s->d1->cookie_len; 854 memcpy(p, s->d1->cookie, s->d1->cookie_len); 855 p += s->d1->cookie_len; 856 857 /* Ciphers supported */ 858 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 859 if (i == 0) { 860 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 861 goto err; 862 } 863 s2n(i, p); 864 p += i; 865 866 /* COMPRESSION */ 867 if (s->ctx->comp_methods == NULL) 868 j = 0; 869 else 870 j = sk_SSL_COMP_num(s->ctx->comp_methods); 871 *(p++) = 1 + j; 872 for (i = 0; i < j; i++) { 873 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 874 *(p++) = comp->id; 875 } 876 *(p++) = 0; /* Add the NULL method */ 877 878#ifndef OPENSSL_NO_TLSEXT 879 /* TLS extensions */ 880 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 881 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 882 goto err; 883 } 884 if ((p = 885 ssl_add_clienthello_tlsext(s, p, 886 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 887 NULL) { 888 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 889 goto err; 890 } 891#endif 892 893 l = (p - d); 894 d = buf; 895 896 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 897 898 s->state = SSL3_ST_CW_CLNT_HELLO_B; 899 /* number of bytes to write */ 900 s->init_num = p - buf; 901 s->init_off = 0; 902 903 /* buffer the message to handle re-xmits */ 904 dtls1_buffer_message(s, 0); 905 } 906 907 /* SSL3_ST_CW_CLNT_HELLO_B */ 908 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 909 err: 910 return (-1); 911} 912 913static int dtls1_get_hello_verify(SSL *s) 914{ 915 int n, al, ok = 0; 916 unsigned char *data; 917 unsigned int cookie_len; 918 919 n = s->method->ssl_get_message(s, 920 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 921 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 922 -1, s->max_cert_list, &ok); 923 924 if (!ok) 925 return ((int)n); 926 927 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 928 s->d1->send_cookie = 0; 929 s->s3->tmp.reuse_message = 1; 930 return (1); 931 } 932 933 data = (unsigned char *)s->init_msg; 934 935 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) { 936 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION); 937 s->version = (s->version & 0xff00) | data[1]; 938 al = SSL_AD_PROTOCOL_VERSION; 939 goto f_err; 940 } 941 data += 2; 942 943 cookie_len = *(data++); 944 if (cookie_len > sizeof(s->d1->cookie)) { 945 al = SSL_AD_ILLEGAL_PARAMETER; 946 goto f_err; 947 } 948 949 memcpy(s->d1->cookie, data, cookie_len); 950 s->d1->cookie_len = cookie_len; 951 952 s->d1->send_cookie = 1; 953 return 1; 954 955 f_err: 956 ssl3_send_alert(s, SSL3_AL_FATAL, al); 957 s->state = SSL_ST_ERR; 958 return -1; 959} 960 961int dtls1_send_client_key_exchange(SSL *s) 962{ 963 unsigned char *p, *d; 964 int n; 965 unsigned long alg_k; 966#ifndef OPENSSL_NO_RSA 967 unsigned char *q; 968 EVP_PKEY *pkey = NULL; 969#endif 970#ifndef OPENSSL_NO_KRB5 971 KSSL_ERR kssl_err; 972#endif /* OPENSSL_NO_KRB5 */ 973#ifndef OPENSSL_NO_ECDH 974 EC_KEY *clnt_ecdh = NULL; 975 const EC_POINT *srvr_ecpoint = NULL; 976 EVP_PKEY *srvr_pub_pkey = NULL; 977 unsigned char *encodedPoint = NULL; 978 int encoded_pt_len = 0; 979 BN_CTX *bn_ctx = NULL; 980#endif 981 982 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 983 d = (unsigned char *)s->init_buf->data; 984 p = &(d[DTLS1_HM_HEADER_LENGTH]); 985 986 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 987 988 /* Fool emacs indentation */ 989 if (0) { 990 } 991#ifndef OPENSSL_NO_RSA 992 else if (alg_k & SSL_kRSA) { 993 RSA *rsa; 994 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 995 996 if (s->session->sess_cert == NULL) { 997 /* 998 * We should always have a server certificate with SSL_kRSA. 999 */ 1000 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1001 ERR_R_INTERNAL_ERROR); 1002 goto err; 1003 } 1004 1005 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1006 rsa = s->session->sess_cert->peer_rsa_tmp; 1007 else { 1008 pkey = 1009 X509_get_pubkey(s->session-> 1010 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 1011 x509); 1012 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 1013 || (pkey->pkey.rsa == NULL)) { 1014 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1015 ERR_R_INTERNAL_ERROR); 1016 goto err; 1017 } 1018 rsa = pkey->pkey.rsa; 1019 EVP_PKEY_free(pkey); 1020 } 1021 1022 tmp_buf[0] = s->client_version >> 8; 1023 tmp_buf[1] = s->client_version & 0xff; 1024 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 1025 goto err; 1026 1027 s->session->master_key_length = sizeof tmp_buf; 1028 1029 q = p; 1030 /* Fix buf for TLS and [incidentally] DTLS */ 1031 if (s->version > SSL3_VERSION) 1032 p += 2; 1033 n = RSA_public_encrypt(sizeof tmp_buf, 1034 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 1035# ifdef PKCS1_CHECK 1036 if (s->options & SSL_OP_PKCS1_CHECK_1) 1037 p[1]++; 1038 if (s->options & SSL_OP_PKCS1_CHECK_2) 1039 tmp_buf[0] = 0x70; 1040# endif 1041 if (n <= 0) { 1042 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1043 SSL_R_BAD_RSA_ENCRYPT); 1044 goto err; 1045 } 1046 1047 /* Fix buf for TLS and [incidentally] DTLS */ 1048 if (s->version > SSL3_VERSION) { 1049 s2n(n, q); 1050 n += 2; 1051 } 1052 1053 s->session->master_key_length = 1054 s->method->ssl3_enc->generate_master_secret(s, 1055 s-> 1056 session->master_key, 1057 tmp_buf, 1058 sizeof tmp_buf); 1059 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1060 } 1061#endif 1062#ifndef OPENSSL_NO_KRB5 1063 else if (alg_k & SSL_kKRB5) { 1064 krb5_error_code krb5rc; 1065 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1066 /* krb5_data krb5_ap_req; */ 1067 krb5_data *enc_ticket; 1068 krb5_data authenticator, *authp = NULL; 1069 EVP_CIPHER_CTX ciph_ctx; 1070 const EVP_CIPHER *enc = NULL; 1071 unsigned char iv[EVP_MAX_IV_LENGTH]; 1072 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1073 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 1074 int padl, outl = sizeof(epms); 1075 1076 EVP_CIPHER_CTX_init(&ciph_ctx); 1077 1078# ifdef KSSL_DEBUG 1079 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1080 alg_k, SSL_kKRB5); 1081# endif /* KSSL_DEBUG */ 1082 1083 authp = NULL; 1084# ifdef KRB5SENDAUTH 1085 if (KRB5SENDAUTH) 1086 authp = &authenticator; 1087# endif /* KRB5SENDAUTH */ 1088 1089 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 1090 enc = kssl_map_enc(kssl_ctx->enctype); 1091 if (enc == NULL) 1092 goto err; 1093# ifdef KSSL_DEBUG 1094 { 1095 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1096 if (krb5rc && kssl_err.text) 1097 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1098 } 1099# endif /* KSSL_DEBUG */ 1100 1101 if (krb5rc) { 1102 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1103 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 1104 goto err; 1105 } 1106 1107 /*- 1108 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 1109 ** in place of RFC 2712 KerberosWrapper, as in: 1110 ** 1111 ** Send ticket (copy to *p, set n = length) 1112 ** n = krb5_ap_req.length; 1113 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1114 ** if (krb5_ap_req.data) 1115 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1116 ** 1117 ** Now using real RFC 2712 KerberosWrapper 1118 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1119 ** Note: 2712 "opaque" types are here replaced 1120 ** with a 2-byte length followed by the value. 1121 ** Example: 1122 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1123 ** Where "xx xx" = length bytes. Shown here with 1124 ** optional authenticator omitted. 1125 */ 1126 1127 /* KerberosWrapper.Ticket */ 1128 s2n(enc_ticket->length, p); 1129 memcpy(p, enc_ticket->data, enc_ticket->length); 1130 p += enc_ticket->length; 1131 n = enc_ticket->length + 2; 1132 1133 /* KerberosWrapper.Authenticator */ 1134 if (authp && authp->length) { 1135 s2n(authp->length, p); 1136 memcpy(p, authp->data, authp->length); 1137 p += authp->length; 1138 n += authp->length + 2; 1139 1140 free(authp->data); 1141 authp->data = NULL; 1142 authp->length = 0; 1143 } else { 1144 s2n(0, p); /* null authenticator length */ 1145 n += 2; 1146 } 1147 1148 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0) 1149 goto err; 1150 1151 /*- 1152 * 20010420 VRS. Tried it this way; failed. 1153 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1154 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1155 * kssl_ctx->length); 1156 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1157 */ 1158 1159 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1160 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 1161 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 1162 sizeof tmp_buf); 1163 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 1164 outl += padl; 1165 if (outl > (int)sizeof epms) { 1166 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1167 ERR_R_INTERNAL_ERROR); 1168 goto err; 1169 } 1170 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1171 1172 /* KerberosWrapper.EncryptedPreMasterSecret */ 1173 s2n(outl, p); 1174 memcpy(p, epms, outl); 1175 p += outl; 1176 n += outl + 2; 1177 1178 s->session->master_key_length = 1179 s->method->ssl3_enc->generate_master_secret(s, 1180 s-> 1181 session->master_key, 1182 tmp_buf, 1183 sizeof tmp_buf); 1184 1185 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1186 OPENSSL_cleanse(epms, outl); 1187 } 1188#endif 1189#ifndef OPENSSL_NO_DH 1190 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 1191 DH *dh_srvr, *dh_clnt; 1192 1193 if (s->session->sess_cert == NULL) { 1194 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1195 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1196 SSL_R_UNEXPECTED_MESSAGE); 1197 goto err; 1198 } 1199 1200 if (s->session->sess_cert->peer_dh_tmp != NULL) 1201 dh_srvr = s->session->sess_cert->peer_dh_tmp; 1202 else { 1203 /* we get them from the cert */ 1204 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1205 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1206 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1207 goto err; 1208 } 1209 1210 /* generate a new random key */ 1211 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1212 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1213 goto err; 1214 } 1215 if (!DH_generate_key(dh_clnt)) { 1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1217 goto err; 1218 } 1219 1220 /* 1221 * use the 'p' output buffer for the DH key, but make sure to 1222 * clear it out afterwards 1223 */ 1224 1225 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 1226 1227 if (n <= 0) { 1228 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 1229 goto err; 1230 } 1231 1232 /* generate master key from the result */ 1233 s->session->master_key_length = 1234 s->method->ssl3_enc->generate_master_secret(s, 1235 s-> 1236 session->master_key, 1237 p, n); 1238 /* clean up */ 1239 memset(p, 0, n); 1240 1241 /* send off the data */ 1242 n = BN_num_bytes(dh_clnt->pub_key); 1243 s2n(n, p); 1244 BN_bn2bin(dh_clnt->pub_key, p); 1245 n += 2; 1246 1247 DH_free(dh_clnt); 1248 1249 /* perhaps clean things up a bit EAY EAY EAY EAY */ 1250 } 1251#endif 1252#ifndef OPENSSL_NO_ECDH 1253 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 1254 const EC_GROUP *srvr_group = NULL; 1255 EC_KEY *tkey; 1256 int ecdh_clnt_cert = 0; 1257 int field_size = 0; 1258 1259 if (s->session->sess_cert == NULL) { 1260 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1261 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1262 SSL_R_UNEXPECTED_MESSAGE); 1263 goto err; 1264 } 1265 1266 /* 1267 * Did we send out the client's ECDH share for use in premaster 1268 * computation as part of client certificate? If so, set 1269 * ecdh_clnt_cert to 1. 1270 */ 1271 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 1272 /* 1273 * XXX: For now, we do not support client authentication 1274 * using ECDH certificates. To add such support, one needs to 1275 * add code that checks for appropriate conditions and sets 1276 * ecdh_clnt_cert to 1. For example, the cert have an ECC key 1277 * on the same curve as the server's and the key should be 1278 * authorized for key agreement. One also needs to add code 1279 * in ssl3_connect to skip sending the certificate verify 1280 * message. if ((s->cert->key->privatekey != NULL) && 1281 * (s->cert->key->privatekey->type == EVP_PKEY_EC) && ...) 1282 * ecdh_clnt_cert = 1; 1283 */ 1284 } 1285 1286 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 1287 tkey = s->session->sess_cert->peer_ecdh_tmp; 1288 } else { 1289 /* Get the Server Public Key from Cert */ 1290 srvr_pub_pkey = 1291 X509_get_pubkey(s->session-> 1292 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1293 if ((srvr_pub_pkey == NULL) 1294 || (srvr_pub_pkey->type != EVP_PKEY_EC) 1295 || (srvr_pub_pkey->pkey.ec == NULL)) { 1296 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1297 ERR_R_INTERNAL_ERROR); 1298 goto err; 1299 } 1300 1301 tkey = srvr_pub_pkey->pkey.ec; 1302 } 1303 1304 srvr_group = EC_KEY_get0_group(tkey); 1305 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1306 1307 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 1308 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1309 ERR_R_INTERNAL_ERROR); 1310 goto err; 1311 } 1312 1313 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 1314 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1315 ERR_R_MALLOC_FAILURE); 1316 goto err; 1317 } 1318 1319 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 1320 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 1321 goto err; 1322 } 1323 if (ecdh_clnt_cert) { 1324 /* 1325 * Reuse key info from our certificate We only need our 1326 * private key to perform the ECDH computation. 1327 */ 1328 const BIGNUM *priv_key; 1329 tkey = s->cert->key->privatekey->pkey.ec; 1330 priv_key = EC_KEY_get0_private_key(tkey); 1331 if (priv_key == NULL) { 1332 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1333 ERR_R_MALLOC_FAILURE); 1334 goto err; 1335 } 1336 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 1337 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1338 ERR_R_EC_LIB); 1339 goto err; 1340 } 1341 } else { 1342 /* Generate a new ECDH key pair */ 1343 if (!(EC_KEY_generate_key(clnt_ecdh))) { 1344 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1345 ERR_R_ECDH_LIB); 1346 goto err; 1347 } 1348 } 1349 1350 /* 1351 * use the 'p' output buffer for the ECDH key, but make sure to 1352 * clear it out afterwards 1353 */ 1354 1355 field_size = EC_GROUP_get_degree(srvr_group); 1356 if (field_size <= 0) { 1357 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1358 goto err; 1359 } 1360 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 1361 clnt_ecdh, NULL); 1362 if (n <= 0) { 1363 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1364 goto err; 1365 } 1366 1367 /* generate master key from the result */ 1368 s->session->master_key_length = 1369 s->method->ssl3_enc->generate_master_secret(s, 1370 s-> 1371 session->master_key, 1372 p, n); 1373 1374 memset(p, 0, n); /* clean up */ 1375 1376 if (ecdh_clnt_cert) { 1377 /* Send empty client key exch message */ 1378 n = 0; 1379 } else { 1380 /* 1381 * First check the size of encoding and allocate memory 1382 * accordingly. 1383 */ 1384 encoded_pt_len = 1385 EC_POINT_point2oct(srvr_group, 1386 EC_KEY_get0_public_key(clnt_ecdh), 1387 POINT_CONVERSION_UNCOMPRESSED, 1388 NULL, 0, NULL); 1389 1390 encodedPoint = (unsigned char *) 1391 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 1392 bn_ctx = BN_CTX_new(); 1393 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1394 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1395 ERR_R_MALLOC_FAILURE); 1396 goto err; 1397 } 1398 1399 /* Encode the public key */ 1400 n = EC_POINT_point2oct(srvr_group, 1401 EC_KEY_get0_public_key(clnt_ecdh), 1402 POINT_CONVERSION_UNCOMPRESSED, 1403 encodedPoint, encoded_pt_len, bn_ctx); 1404 1405 *p = n; /* length of encoded point */ 1406 /* Encoded point will be copied here */ 1407 p += 1; 1408 /* copy the point */ 1409 memcpy((unsigned char *)p, encodedPoint, n); 1410 /* increment n to account for length field */ 1411 n += 1; 1412 } 1413 1414 /* Free allocated memory */ 1415 BN_CTX_free(bn_ctx); 1416 if (encodedPoint != NULL) 1417 OPENSSL_free(encodedPoint); 1418 if (clnt_ecdh != NULL) 1419 EC_KEY_free(clnt_ecdh); 1420 EVP_PKEY_free(srvr_pub_pkey); 1421 } 1422#endif /* !OPENSSL_NO_ECDH */ 1423 1424#ifndef OPENSSL_NO_PSK 1425 else if (alg_k & SSL_kPSK) { 1426 char identity[PSK_MAX_IDENTITY_LEN]; 1427 unsigned char *t = NULL; 1428 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 1429 unsigned int pre_ms_len = 0, psk_len = 0; 1430 int psk_err = 1; 1431 1432 n = 0; 1433 if (s->psk_client_callback == NULL) { 1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1435 SSL_R_PSK_NO_CLIENT_CB); 1436 goto err; 1437 } 1438 1439 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1440 identity, PSK_MAX_IDENTITY_LEN, 1441 psk_or_pre_ms, 1442 sizeof(psk_or_pre_ms)); 1443 if (psk_len > PSK_MAX_PSK_LEN) { 1444 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1445 ERR_R_INTERNAL_ERROR); 1446 goto psk_err; 1447 } else if (psk_len == 0) { 1448 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1449 SSL_R_PSK_IDENTITY_NOT_FOUND); 1450 goto psk_err; 1451 } 1452 1453 /* create PSK pre_master_secret */ 1454 pre_ms_len = 2 + psk_len + 2 + psk_len; 1455 t = psk_or_pre_ms; 1456 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 1457 s2n(psk_len, t); 1458 memset(t, 0, psk_len); 1459 t += psk_len; 1460 s2n(psk_len, t); 1461 1462 if (s->session->psk_identity_hint != NULL) 1463 OPENSSL_free(s->session->psk_identity_hint); 1464 s->session->psk_identity_hint = 1465 BUF_strdup(s->ctx->psk_identity_hint); 1466 if (s->ctx->psk_identity_hint != NULL 1467 && s->session->psk_identity_hint == NULL) { 1468 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1469 ERR_R_MALLOC_FAILURE); 1470 goto psk_err; 1471 } 1472 1473 if (s->session->psk_identity != NULL) 1474 OPENSSL_free(s->session->psk_identity); 1475 s->session->psk_identity = BUF_strdup(identity); 1476 if (s->session->psk_identity == NULL) { 1477 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1478 ERR_R_MALLOC_FAILURE); 1479 goto psk_err; 1480 } 1481 1482 s->session->master_key_length = 1483 s->method->ssl3_enc->generate_master_secret(s, 1484 s-> 1485 session->master_key, 1486 psk_or_pre_ms, 1487 pre_ms_len); 1488 n = strlen(identity); 1489 s2n(n, p); 1490 memcpy(p, identity, n); 1491 n += 2; 1492 psk_err = 0; 1493 psk_err: 1494 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1495 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1496 if (psk_err != 0) { 1497 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1498 goto err; 1499 } 1500 } 1501#endif 1502 else { 1503 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1504 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1505 ERR_R_INTERNAL_ERROR); 1506 goto err; 1507 } 1508 1509 d = dtls1_set_message_header(s, d, 1510 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1511 /*- 1512 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1513 l2n3(n,d); 1514 l2n(s->d1->handshake_write_seq,d); 1515 s->d1->handshake_write_seq++; 1516 */ 1517 1518 s->state = SSL3_ST_CW_KEY_EXCH_B; 1519 /* number of bytes to write */ 1520 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1521 s->init_off = 0; 1522 1523 /* buffer the message to handle re-xmits */ 1524 dtls1_buffer_message(s, 0); 1525 } 1526 1527 /* SSL3_ST_CW_KEY_EXCH_B */ 1528 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1529 err: 1530#ifndef OPENSSL_NO_ECDH 1531 BN_CTX_free(bn_ctx); 1532 if (encodedPoint != NULL) 1533 OPENSSL_free(encodedPoint); 1534 if (clnt_ecdh != NULL) 1535 EC_KEY_free(clnt_ecdh); 1536 EVP_PKEY_free(srvr_pub_pkey); 1537#endif 1538 return (-1); 1539} 1540 1541int dtls1_send_client_verify(SSL *s) 1542{ 1543 unsigned char *p, *d; 1544 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1545 EVP_PKEY *pkey; 1546#ifndef OPENSSL_NO_RSA 1547 unsigned u = 0; 1548#endif 1549 unsigned long n; 1550#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1551 int j; 1552#endif 1553 1554 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 1555 d = (unsigned char *)s->init_buf->data; 1556 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1557 pkey = s->cert->key->privatekey; 1558 1559 s->method->ssl3_enc->cert_verify_mac(s, 1560 NID_sha1, 1561 &(data[MD5_DIGEST_LENGTH])); 1562 1563#ifndef OPENSSL_NO_RSA 1564 if (pkey->type == EVP_PKEY_RSA) { 1565 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 1566 if (RSA_sign(NID_md5_sha1, data, 1567 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 1568 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1569 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 1570 goto err; 1571 } 1572 s2n(u, p); 1573 n = u + 2; 1574 } else 1575#endif 1576#ifndef OPENSSL_NO_DSA 1577 if (pkey->type == EVP_PKEY_DSA) { 1578 if (!DSA_sign(pkey->save_type, 1579 &(data[MD5_DIGEST_LENGTH]), 1580 SHA_DIGEST_LENGTH, &(p[2]), 1581 (unsigned int *)&j, pkey->pkey.dsa)) { 1582 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 1583 goto err; 1584 } 1585 s2n(j, p); 1586 n = j + 2; 1587 } else 1588#endif 1589#ifndef OPENSSL_NO_ECDSA 1590 if (pkey->type == EVP_PKEY_EC) { 1591 if (!ECDSA_sign(pkey->save_type, 1592 &(data[MD5_DIGEST_LENGTH]), 1593 SHA_DIGEST_LENGTH, &(p[2]), 1594 (unsigned int *)&j, pkey->pkey.ec)) { 1595 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 1596 goto err; 1597 } 1598 s2n(j, p); 1599 n = j + 2; 1600 } else 1601#endif 1602 { 1603 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 1604 goto err; 1605 } 1606 1607 d = dtls1_set_message_header(s, d, 1608 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n); 1609 1610 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH; 1611 s->init_off = 0; 1612 1613 /* buffer the message to handle re-xmits */ 1614 dtls1_buffer_message(s, 0); 1615 1616 s->state = SSL3_ST_CW_CERT_VRFY_B; 1617 } 1618 1619 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1620 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1621 err: 1622 return (-1); 1623} 1624 1625int dtls1_send_client_certificate(SSL *s) 1626{ 1627 X509 *x509 = NULL; 1628 EVP_PKEY *pkey = NULL; 1629 int i; 1630 unsigned long l; 1631 1632 if (s->state == SSL3_ST_CW_CERT_A) { 1633 if ((s->cert == NULL) || 1634 (s->cert->key->x509 == NULL) || 1635 (s->cert->key->privatekey == NULL)) 1636 s->state = SSL3_ST_CW_CERT_B; 1637 else 1638 s->state = SSL3_ST_CW_CERT_C; 1639 } 1640 1641 /* We need to get a client cert */ 1642 if (s->state == SSL3_ST_CW_CERT_B) { 1643 /* 1644 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 1645 * return(-1); We then get retied later 1646 */ 1647 i = 0; 1648 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1649 if (i < 0) { 1650 s->rwstate = SSL_X509_LOOKUP; 1651 return (-1); 1652 } 1653 s->rwstate = SSL_NOTHING; 1654 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 1655 s->state = SSL3_ST_CW_CERT_B; 1656 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 1657 i = 0; 1658 } else if (i == 1) { 1659 i = 0; 1660 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, 1661 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1662 } 1663 1664 if (x509 != NULL) 1665 X509_free(x509); 1666 if (pkey != NULL) 1667 EVP_PKEY_free(pkey); 1668 if (i == 0) { 1669 if (s->version == SSL3_VERSION) { 1670 s->s3->tmp.cert_req = 0; 1671 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 1672 return (1); 1673 } else { 1674 s->s3->tmp.cert_req = 2; 1675 } 1676 } 1677 1678 /* Ok, we have a cert */ 1679 s->state = SSL3_ST_CW_CERT_C; 1680 } 1681 1682 if (s->state == SSL3_ST_CW_CERT_C) { 1683 s->state = SSL3_ST_CW_CERT_D; 1684 l = dtls1_output_cert_chain(s, 1685 (s->s3->tmp.cert_req == 1686 2) ? NULL : s->cert->key->x509); 1687 if (!l) { 1688 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1689 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1690 return 0; 1691 } 1692 s->init_num = (int)l; 1693 s->init_off = 0; 1694 1695 /* set header called by dtls1_output_cert_chain() */ 1696 1697 /* buffer the message to handle re-xmits */ 1698 dtls1_buffer_message(s, 0); 1699 } 1700 /* SSL3_ST_CW_CERT_D */ 1701 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1702} 1703