d1_clnt.c revision 264331
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, 145 dtls1_get_client_method) 146 147int dtls1_connect(SSL *s) 148 { 149 BUF_MEM *buf=NULL; 150 unsigned long Time=(unsigned long)time(NULL); 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int ret= -1; 153 int new_state,state,skip=0; 154#ifndef OPENSSL_NO_SCTP 155 unsigned char sctpauthkey[64]; 156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 157#endif 158 159 RAND_add(&Time,sizeof(Time),0); 160 ERR_clear_error(); 161 clear_sys_error(); 162 163 if (s->info_callback != NULL) 164 cb=s->info_callback; 165 else if (s->ctx->info_callback != NULL) 166 cb=s->ctx->info_callback; 167 168 s->in_handshake++; 169 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 170 171#ifndef OPENSSL_NO_SCTP 172 /* Notify SCTP BIO socket to enter handshake 173 * mode and prevent stream identifier other 174 * 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, s->in_handshake, NULL); 177#endif 178 179#ifndef OPENSSL_NO_HEARTBEATS 180 /* If we're awaiting a HeartbeatResponse, pretend we 181 * already got and don't await it anymore, because 182 * Heartbeats don't make sense during handshakes anyway. 183 */ 184 if (s->tlsext_hb_pending) 185 { 186 dtls1_stop_timer(s); 187 s->tlsext_hb_pending = 0; 188 s->tlsext_hb_seq++; 189 } 190#endif 191 192 for (;;) 193 { 194 state=s->state; 195 196 switch(s->state) 197 { 198 case SSL_ST_RENEGOTIATE: 199 s->renegotiate=1; 200 s->state=SSL_ST_CONNECT; 201 s->ctx->stats.sess_connect_renegotiate++; 202 /* break */ 203 case SSL_ST_BEFORE: 204 case SSL_ST_CONNECT: 205 case SSL_ST_BEFORE|SSL_ST_CONNECT: 206 case SSL_ST_OK|SSL_ST_CONNECT: 207 208 s->server=0; 209 if (cb != NULL) 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 { 214 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR); 215 ret = -1; 216 goto end; 217 } 218 219 /* s->version=SSL3_VERSION; */ 220 s->type=SSL_ST_CONNECT; 221 222 if (s->init_buf == NULL) 223 { 224 if ((buf=BUF_MEM_new()) == NULL) 225 { 226 ret= -1; 227 goto end; 228 } 229 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 230 { 231 ret= -1; 232 goto end; 233 } 234 s->init_buf=buf; 235 buf=NULL; 236 } 237 238 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 239 240 /* setup buffing BIO */ 241 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 242 243 /* don't push the buffering BIO quite yet */ 244 245 s->state=SSL3_ST_CW_CLNT_HELLO_A; 246 s->ctx->stats.sess_connect++; 247 s->init_num=0; 248 /* mark client_random uninitialized */ 249 memset(s->s3->client_random,0,sizeof(s->s3->client_random)); 250 s->d1->send_cookie = 0; 251 s->hit = 0; 252 break; 253 254#ifndef OPENSSL_NO_SCTP 255 case DTLS1_SCTP_ST_CR_READ_SOCK: 256 257 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 258 { 259 s->s3->in_read_app_data=2; 260 s->rwstate=SSL_READING; 261 BIO_clear_retry_flags(SSL_get_rbio(s)); 262 BIO_set_retry_read(SSL_get_rbio(s)); 263 ret = -1; 264 goto end; 265 } 266 267 s->state=s->s3->tmp.next_state; 268 break; 269 270 case DTLS1_SCTP_ST_CW_WRITE_SOCK: 271 /* read app data until dry event */ 272 273 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 274 if (ret < 0) goto end; 275 276 if (ret == 0) 277 { 278 s->s3->in_read_app_data=2; 279 s->rwstate=SSL_READING; 280 BIO_clear_retry_flags(SSL_get_rbio(s)); 281 BIO_set_retry_read(SSL_get_rbio(s)); 282 ret = -1; 283 goto end; 284 } 285 286 s->state=s->d1->next_state; 287 break; 288#endif 289 290 case SSL3_ST_CW_CLNT_HELLO_A: 291 case SSL3_ST_CW_CLNT_HELLO_B: 292 293 s->shutdown=0; 294 295 /* every DTLS ClientHello resets Finished MAC */ 296 ssl3_init_finished_mac(s); 297 298 dtls1_start_timer(s); 299 ret=dtls1_client_hello(s); 300 if (ret <= 0) goto end; 301 302 if ( s->d1->send_cookie) 303 { 304 s->state=SSL3_ST_CW_FLUSH; 305 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A; 306 } 307 else 308 s->state=SSL3_ST_CR_SRVR_HELLO_A; 309 310 s->init_num=0; 311 312#ifndef OPENSSL_NO_SCTP 313 /* Disable buffering for SCTP */ 314 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 315 { 316#endif 317 /* turn on buffering for the next lot of output */ 318 if (s->bbio != s->wbio) 319 s->wbio=BIO_push(s->bbio,s->wbio); 320#ifndef OPENSSL_NO_SCTP 321 } 322#endif 323 324 break; 325 326 case SSL3_ST_CR_SRVR_HELLO_A: 327 case SSL3_ST_CR_SRVR_HELLO_B: 328 ret=ssl3_get_server_hello(s); 329 if (ret <= 0) goto end; 330 else 331 { 332 if (s->hit) 333 { 334#ifndef OPENSSL_NO_SCTP 335 /* Add new shared key for SCTP-Auth, 336 * will be ignored if no SCTP used. 337 */ 338 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 339 DTLS1_SCTP_AUTH_LABEL); 340 341 SSL_export_keying_material(s, sctpauthkey, 342 sizeof(sctpauthkey), labelbuffer, 343 sizeof(labelbuffer), NULL, 0, 0); 344 345 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 346 sizeof(sctpauthkey), sctpauthkey); 347#endif 348 349 s->state=SSL3_ST_CR_FINISHED_A; 350 } 351 else 352 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 353 } 354 s->init_num=0; 355 break; 356 357 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 358 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 359 360 ret = dtls1_get_hello_verify(s); 361 if ( ret <= 0) 362 goto end; 363 dtls1_stop_timer(s); 364 if ( s->d1->send_cookie) /* start again, with a cookie */ 365 s->state=SSL3_ST_CW_CLNT_HELLO_A; 366 else 367 s->state = SSL3_ST_CR_CERT_A; 368 s->init_num = 0; 369 break; 370 371 case SSL3_ST_CR_CERT_A: 372 case SSL3_ST_CR_CERT_B: 373#ifndef OPENSSL_NO_TLSEXT 374 ret=ssl3_check_finished(s); 375 if (ret <= 0) goto end; 376 if (ret == 2) 377 { 378 s->hit = 1; 379 if (s->tlsext_ticket_expected) 380 s->state=SSL3_ST_CR_SESSION_TICKET_A; 381 else 382 s->state=SSL3_ST_CR_FINISHED_A; 383 s->init_num=0; 384 break; 385 } 386#endif 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 { 391 ret=ssl3_get_server_certificate(s); 392 if (ret <= 0) 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 } 399 else 400 { 401 skip = 1; 402 s->state=SSL3_ST_CR_KEY_EXCH_A; 403 } 404#else 405 } 406 else 407 skip=1; 408 409 s->state=SSL3_ST_CR_KEY_EXCH_A; 410#endif 411 s->init_num=0; 412 break; 413 414 case SSL3_ST_CR_KEY_EXCH_A: 415 case SSL3_ST_CR_KEY_EXCH_B: 416 ret=ssl3_get_key_exchange(s); 417 if (ret <= 0) goto end; 418 s->state=SSL3_ST_CR_CERT_REQ_A; 419 s->init_num=0; 420 421 /* at this point we check that we have the 422 * required stuff from the server */ 423 if (!ssl3_check_cert_and_algorithm(s)) 424 { 425 ret= -1; 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) goto end; 434 s->state=SSL3_ST_CR_SRVR_DONE_A; 435 s->init_num=0; 436 break; 437 438 case SSL3_ST_CR_SRVR_DONE_A: 439 case SSL3_ST_CR_SRVR_DONE_B: 440 ret=ssl3_get_server_done(s); 441 if (ret <= 0) goto end; 442 dtls1_stop_timer(s); 443 if (s->s3->tmp.cert_req) 444 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A; 445 else 446 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A; 447 s->init_num=0; 448 449#ifndef OPENSSL_NO_SCTP 450 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 451 state == SSL_ST_RENEGOTIATE) 452 s->state=DTLS1_SCTP_ST_CR_READ_SOCK; 453 else 454#endif 455 s->state=s->s3->tmp.next_state; 456 break; 457 458 case SSL3_ST_CW_CERT_A: 459 case SSL3_ST_CW_CERT_B: 460 case SSL3_ST_CW_CERT_C: 461 case SSL3_ST_CW_CERT_D: 462 dtls1_start_timer(s); 463 ret=dtls1_send_client_certificate(s); 464 if (ret <= 0) goto end; 465 s->state=SSL3_ST_CW_KEY_EXCH_A; 466 s->init_num=0; 467 break; 468 469 case SSL3_ST_CW_KEY_EXCH_A: 470 case SSL3_ST_CW_KEY_EXCH_B: 471 dtls1_start_timer(s); 472 ret=dtls1_send_client_key_exchange(s); 473 if (ret <= 0) goto end; 474 475#ifndef OPENSSL_NO_SCTP 476 /* Add new shared key for SCTP-Auth, 477 * will be ignored if no SCTP used. 478 */ 479 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 480 DTLS1_SCTP_AUTH_LABEL); 481 482 SSL_export_keying_material(s, sctpauthkey, 483 sizeof(sctpauthkey), labelbuffer, 484 sizeof(labelbuffer), NULL, 0, 0); 485 486 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 487 sizeof(sctpauthkey), sctpauthkey); 488#endif 489 490 /* EAY EAY EAY need to check for DH fix cert 491 * sent back */ 492 /* For TLS, cert_req is set to 2, so a cert chain 493 * of nothing is sent, but no verify packet is sent */ 494 if (s->s3->tmp.cert_req == 1) 495 { 496 s->state=SSL3_ST_CW_CERT_VRFY_A; 497 } 498 else 499 { 500#ifndef OPENSSL_NO_SCTP 501 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 502 { 503 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 504 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 505 } 506 else 507#endif 508 s->state=SSL3_ST_CW_CHANGE_A; 509 s->s3->change_cipher_spec=0; 510 } 511 512 s->init_num=0; 513 break; 514 515 case SSL3_ST_CW_CERT_VRFY_A: 516 case SSL3_ST_CW_CERT_VRFY_B: 517 dtls1_start_timer(s); 518 ret=dtls1_send_client_verify(s); 519 if (ret <= 0) goto end; 520#ifndef OPENSSL_NO_SCTP 521 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 522 { 523 s->d1->next_state=SSL3_ST_CW_CHANGE_A; 524 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 525 } 526 else 527#endif 528 s->state=SSL3_ST_CW_CHANGE_A; 529 s->init_num=0; 530 s->s3->change_cipher_spec=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,SSL3_ST_CW_CHANGE_B); 539 if (ret <= 0) goto end; 540 541 s->state=SSL3_ST_CW_FINISHED_A; 542 s->init_num=0; 543 544 s->session->cipher=s->s3->tmp.new_cipher; 545#ifdef OPENSSL_NO_COMP 546 s->session->compress_meth=0; 547#else 548 if (s->s3->tmp.new_compression == NULL) 549 s->session->compress_meth=0; 550 else 551 s->session->compress_meth= 552 s->s3->tmp.new_compression->id; 553#endif 554 if (!s->method->ssl3_enc->setup_key_block(s)) 555 { 556 ret= -1; 557 goto end; 558 } 559 560 if (!s->method->ssl3_enc->change_cipher_state(s, 561 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 562 { 563 ret= -1; 564 goto end; 565 } 566 567#ifndef OPENSSL_NO_SCTP 568 if (s->hit) 569 { 570 /* Change to new shared key of SCTP-Auth, 571 * will be ignored if no SCTP used. 572 */ 573 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 574 } 575#endif 576 577 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 578 break; 579 580 case SSL3_ST_CW_FINISHED_A: 581 case SSL3_ST_CW_FINISHED_B: 582 if (!s->hit) 583 dtls1_start_timer(s); 584 ret=dtls1_send_finished(s, 585 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 586 s->method->ssl3_enc->client_finished_label, 587 s->method->ssl3_enc->client_finished_label_len); 588 if (ret <= 0) goto end; 589 s->state=SSL3_ST_CW_FLUSH; 590 591 /* clear flags */ 592 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 593 if (s->hit) 594 { 595 s->s3->tmp.next_state=SSL_ST_OK; 596#ifndef OPENSSL_NO_SCTP 597 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 598 { 599 s->d1->next_state = s->s3->tmp.next_state; 600 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 601 } 602#endif 603 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 604 { 605 s->state=SSL_ST_OK; 606#ifndef OPENSSL_NO_SCTP 607 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 608 { 609 s->d1->next_state = SSL_ST_OK; 610 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 611 } 612#endif 613 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 614 s->s3->delay_buf_pop_ret=0; 615 } 616 } 617 else 618 { 619#ifndef OPENSSL_NO_SCTP 620 /* Change to new shared key of SCTP-Auth, 621 * will be ignored if no SCTP used. 622 */ 623 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 624#endif 625 626#ifndef OPENSSL_NO_TLSEXT 627 /* Allow NewSessionTicket if ticket expected */ 628 if (s->tlsext_ticket_expected) 629 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 630 else 631#endif 632 633 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 634 } 635 s->init_num=0; 636 break; 637 638#ifndef OPENSSL_NO_TLSEXT 639 case SSL3_ST_CR_SESSION_TICKET_A: 640 case SSL3_ST_CR_SESSION_TICKET_B: 641 ret=ssl3_get_new_session_ticket(s); 642 if (ret <= 0) goto end; 643 s->state=SSL3_ST_CR_FINISHED_A; 644 s->init_num=0; 645 break; 646 647 case SSL3_ST_CR_CERT_STATUS_A: 648 case SSL3_ST_CR_CERT_STATUS_B: 649 ret=ssl3_get_cert_status(s); 650 if (ret <= 0) goto end; 651 s->state=SSL3_ST_CR_KEY_EXCH_A; 652 s->init_num=0; 653 break; 654#endif 655 656 case SSL3_ST_CR_FINISHED_A: 657 case SSL3_ST_CR_FINISHED_B: 658 s->d1->change_cipher_spec_ok = 1; 659 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 660 SSL3_ST_CR_FINISHED_B); 661 if (ret <= 0) goto end; 662 dtls1_stop_timer(s); 663 664 if (s->hit) 665 s->state=SSL3_ST_CW_CHANGE_A; 666 else 667 s->state=SSL_ST_OK; 668 669#ifndef OPENSSL_NO_SCTP 670 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 671 state == SSL_ST_RENEGOTIATE) 672 { 673 s->d1->next_state=s->state; 674 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 675 } 676#endif 677 678 s->init_num=0; 679 break; 680 681 case SSL3_ST_CW_FLUSH: 682 s->rwstate=SSL_WRITING; 683 if (BIO_flush(s->wbio) <= 0) 684 { 685 /* If the write error was fatal, stop trying */ 686 if (!BIO_should_retry(s->wbio)) 687 { 688 s->rwstate=SSL_NOTHING; 689 s->state=s->s3->tmp.next_state; 690 } 691 692 ret= -1; 693 goto end; 694 } 695 s->rwstate=SSL_NOTHING; 696 s->state=s->s3->tmp.next_state; 697 break; 698 699 case SSL_ST_OK: 700 /* clean a few things up */ 701 ssl3_cleanup_key_block(s); 702 703#if 0 704 if (s->init_buf != NULL) 705 { 706 BUF_MEM_free(s->init_buf); 707 s->init_buf=NULL; 708 } 709#endif 710 711 /* If we are not 'joining' the last two packets, 712 * remove the buffering now */ 713 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 714 ssl_free_wbio_buffer(s); 715 /* else do it later in ssl3_write */ 716 717 s->init_num=0; 718 s->renegotiate=0; 719 s->new_session=0; 720 721 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 722 if (s->hit) s->ctx->stats.sess_hit++; 723 724 ret=1; 725 /* s->server=0; */ 726 s->handshake_func=dtls1_connect; 727 s->ctx->stats.sess_connect_good++; 728 729 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 730 731 /* done with handshaking */ 732 s->d1->handshake_read_seq = 0; 733 s->d1->next_handshake_write_seq = 0; 734 goto end; 735 /* break; */ 736 737 default: 738 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 739 ret= -1; 740 goto end; 741 /* break; */ 742 } 743 744 /* did we do anything */ 745 if (!s->s3->tmp.reuse_message && !skip) 746 { 747 if (s->debug) 748 { 749 if ((ret=BIO_flush(s->wbio)) <= 0) 750 goto end; 751 } 752 753 if ((cb != NULL) && (s->state != state)) 754 { 755 new_state=s->state; 756 s->state=state; 757 cb(s,SSL_CB_CONNECT_LOOP,1); 758 s->state=new_state; 759 } 760 } 761 skip=0; 762 } 763end: 764 s->in_handshake--; 765 766#ifndef OPENSSL_NO_SCTP 767 /* Notify SCTP BIO socket to leave handshake 768 * mode and allow stream identifier other 769 * than 0. Will be ignored if no SCTP is used. 770 */ 771 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 772#endif 773 774 if (buf != NULL) 775 BUF_MEM_free(buf); 776 if (cb != NULL) 777 cb(s,SSL_CB_CONNECT_EXIT,ret); 778 return(ret); 779 } 780 781int dtls1_client_hello(SSL *s) 782 { 783 unsigned char *buf; 784 unsigned char *p,*d; 785 unsigned int i,j; 786 unsigned long l; 787 SSL_COMP *comp; 788 789 buf=(unsigned char *)s->init_buf->data; 790 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 791 { 792 SSL_SESSION *sess = s->session; 793 if ((s->session == NULL) || 794 (s->session->ssl_version != s->version) || 795#ifdef OPENSSL_NO_TLSEXT 796 !sess->session_id_length || 797#else 798 (!sess->session_id_length && !sess->tlsext_tick) || 799#endif 800 (s->session->not_resumable)) 801 { 802 if (!ssl_get_new_session(s,0)) 803 goto err; 804 } 805 /* else use the pre-loaded session */ 806 807 p=s->s3->client_random; 808 809 /* if client_random is initialized, reuse it, we are 810 * required to use same upon reply to HelloVerify */ 811 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) 812 ; 813 if (i==sizeof(s->s3->client_random)) 814 ssl_fill_hello_random(s, 0, p, 815 sizeof(s->s3->client_random)); 816 817 /* Do the message type and length last */ 818 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 819 820 *(p++)=s->version>>8; 821 *(p++)=s->version&0xff; 822 s->client_version=s->version; 823 824 /* Random stuff */ 825 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 826 p+=SSL3_RANDOM_SIZE; 827 828 /* Session ID */ 829 if (s->new_session) 830 i=0; 831 else 832 i=s->session->session_id_length; 833 *(p++)=i; 834 if (i != 0) 835 { 836 if (i > sizeof s->session->session_id) 837 { 838 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 839 goto err; 840 } 841 memcpy(p,s->session->session_id,i); 842 p+=i; 843 } 844 845 /* cookie stuff */ 846 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 847 { 848 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 849 goto err; 850 } 851 *(p++) = s->d1->cookie_len; 852 memcpy(p, s->d1->cookie, s->d1->cookie_len); 853 p += s->d1->cookie_len; 854 855 /* Ciphers supported */ 856 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 857 if (i == 0) 858 { 859 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 860 goto err; 861 } 862 s2n(i,p); 863 p+=i; 864 865 /* COMPRESSION */ 866 if (s->ctx->comp_methods == NULL) 867 j=0; 868 else 869 j=sk_SSL_COMP_num(s->ctx->comp_methods); 870 *(p++)=1+j; 871 for (i=0; i<j; i++) 872 { 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 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 880 { 881 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 882 goto err; 883 } 884#endif 885 886 l=(p-d); 887 d=buf; 888 889 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 890 891 s->state=SSL3_ST_CW_CLNT_HELLO_B; 892 /* number of bytes to write */ 893 s->init_num=p-buf; 894 s->init_off=0; 895 896 /* buffer the message to handle re-xmits */ 897 dtls1_buffer_message(s, 0); 898 } 899 900 /* SSL3_ST_CW_CLNT_HELLO_B */ 901 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 902err: 903 return(-1); 904 } 905 906static int dtls1_get_hello_verify(SSL *s) 907 { 908 int n, al, ok = 0; 909 unsigned char *data; 910 unsigned int cookie_len; 911 912 n=s->method->ssl_get_message(s, 913 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 914 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 915 -1, 916 s->max_cert_list, 917 &ok); 918 919 if (!ok) return((int)n); 920 921 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 922 { 923 s->d1->send_cookie = 0; 924 s->s3->tmp.reuse_message=1; 925 return(1); 926 } 927 928 data = (unsigned char *)s->init_msg; 929 930 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 931 { 932 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 933 s->version=(s->version&0xff00)|data[1]; 934 al = SSL_AD_PROTOCOL_VERSION; 935 goto f_err; 936 } 937 data+=2; 938 939 cookie_len = *(data++); 940 if ( cookie_len > sizeof(s->d1->cookie)) 941 { 942 al=SSL_AD_ILLEGAL_PARAMETER; 943 goto f_err; 944 } 945 946 memcpy(s->d1->cookie, data, cookie_len); 947 s->d1->cookie_len = cookie_len; 948 949 s->d1->send_cookie = 1; 950 return 1; 951 952f_err: 953 ssl3_send_alert(s, SSL3_AL_FATAL, al); 954 return -1; 955 } 956 957int dtls1_send_client_key_exchange(SSL *s) 958 { 959 unsigned char *p,*d; 960 int n; 961 unsigned long alg_k; 962#ifndef OPENSSL_NO_RSA 963 unsigned char *q; 964 EVP_PKEY *pkey=NULL; 965#endif 966#ifndef OPENSSL_NO_KRB5 967 KSSL_ERR kssl_err; 968#endif /* OPENSSL_NO_KRB5 */ 969#ifndef OPENSSL_NO_ECDH 970 EC_KEY *clnt_ecdh = NULL; 971 const EC_POINT *srvr_ecpoint = NULL; 972 EVP_PKEY *srvr_pub_pkey = NULL; 973 unsigned char *encodedPoint = NULL; 974 int encoded_pt_len = 0; 975 BN_CTX * bn_ctx = NULL; 976#endif 977 978 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 979 { 980 d=(unsigned char *)s->init_buf->data; 981 p= &(d[DTLS1_HM_HEADER_LENGTH]); 982 983 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 984 985 /* Fool emacs indentation */ 986 if (0) {} 987#ifndef OPENSSL_NO_RSA 988 else if (alg_k & SSL_kRSA) 989 { 990 RSA *rsa; 991 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 992 993 if (s->session->sess_cert->peer_rsa_tmp != NULL) 994 rsa=s->session->sess_cert->peer_rsa_tmp; 995 else 996 { 997 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 998 if ((pkey == NULL) || 999 (pkey->type != EVP_PKEY_RSA) || 1000 (pkey->pkey.rsa == NULL)) 1001 { 1002 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1003 goto err; 1004 } 1005 rsa=pkey->pkey.rsa; 1006 EVP_PKEY_free(pkey); 1007 } 1008 1009 tmp_buf[0]=s->client_version>>8; 1010 tmp_buf[1]=s->client_version&0xff; 1011 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 1012 goto err; 1013 1014 s->session->master_key_length=sizeof tmp_buf; 1015 1016 q=p; 1017 /* Fix buf for TLS and [incidentally] DTLS */ 1018 if (s->version > SSL3_VERSION) 1019 p+=2; 1020 n=RSA_public_encrypt(sizeof tmp_buf, 1021 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 1022#ifdef PKCS1_CHECK 1023 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 1024 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 1025#endif 1026 if (n <= 0) 1027 { 1028 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 1029 goto err; 1030 } 1031 1032 /* Fix buf for TLS and [incidentally] DTLS */ 1033 if (s->version > SSL3_VERSION) 1034 { 1035 s2n(n,q); 1036 n+=2; 1037 } 1038 1039 s->session->master_key_length= 1040 s->method->ssl3_enc->generate_master_secret(s, 1041 s->session->master_key, 1042 tmp_buf,sizeof tmp_buf); 1043 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 1044 } 1045#endif 1046#ifndef OPENSSL_NO_KRB5 1047 else if (alg_k & SSL_kKRB5) 1048 { 1049 krb5_error_code krb5rc; 1050 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1051 /* krb5_data krb5_ap_req; */ 1052 krb5_data *enc_ticket; 1053 krb5_data authenticator, *authp = NULL; 1054 EVP_CIPHER_CTX ciph_ctx; 1055 const EVP_CIPHER *enc = NULL; 1056 unsigned char iv[EVP_MAX_IV_LENGTH]; 1057 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1058 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 1059 + EVP_MAX_IV_LENGTH]; 1060 int padl, outl = sizeof(epms); 1061 1062 EVP_CIPHER_CTX_init(&ciph_ctx); 1063 1064#ifdef KSSL_DEBUG 1065 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1066 alg_k, SSL_kKRB5); 1067#endif /* KSSL_DEBUG */ 1068 1069 authp = NULL; 1070#ifdef KRB5SENDAUTH 1071 if (KRB5SENDAUTH) authp = &authenticator; 1072#endif /* KRB5SENDAUTH */ 1073 1074 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 1075 &kssl_err); 1076 enc = kssl_map_enc(kssl_ctx->enctype); 1077 if (enc == NULL) 1078 goto err; 1079#ifdef KSSL_DEBUG 1080 { 1081 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1082 if (krb5rc && kssl_err.text) 1083 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1084 } 1085#endif /* KSSL_DEBUG */ 1086 1087 if (krb5rc) 1088 { 1089 ssl3_send_alert(s,SSL3_AL_FATAL, 1090 SSL_AD_HANDSHAKE_FAILURE); 1091 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1092 kssl_err.reason); 1093 goto err; 1094 } 1095 1096 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 1097 ** in place of RFC 2712 KerberosWrapper, as in: 1098 ** 1099 ** Send ticket (copy to *p, set n = length) 1100 ** n = krb5_ap_req.length; 1101 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1102 ** if (krb5_ap_req.data) 1103 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1104 ** 1105 ** Now using real RFC 2712 KerberosWrapper 1106 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1107 ** Note: 2712 "opaque" types are here replaced 1108 ** with a 2-byte length followed by the value. 1109 ** Example: 1110 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1111 ** Where "xx xx" = length bytes. Shown here with 1112 ** optional authenticator omitted. 1113 */ 1114 1115 /* KerberosWrapper.Ticket */ 1116 s2n(enc_ticket->length,p); 1117 memcpy(p, enc_ticket->data, enc_ticket->length); 1118 p+= enc_ticket->length; 1119 n = enc_ticket->length + 2; 1120 1121 /* KerberosWrapper.Authenticator */ 1122 if (authp && authp->length) 1123 { 1124 s2n(authp->length,p); 1125 memcpy(p, authp->data, authp->length); 1126 p+= authp->length; 1127 n+= authp->length + 2; 1128 1129 free(authp->data); 1130 authp->data = NULL; 1131 authp->length = 0; 1132 } 1133 else 1134 { 1135 s2n(0,p);/* null authenticator length */ 1136 n+=2; 1137 } 1138 1139 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 1140 goto err; 1141 1142 /* 20010420 VRS. Tried it this way; failed. 1143 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1144 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1145 ** kssl_ctx->length); 1146 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1147 */ 1148 1149 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1150 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 1151 kssl_ctx->key,iv); 1152 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 1153 sizeof tmp_buf); 1154 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 1155 outl += padl; 1156 if (outl > (int)sizeof epms) 1157 { 1158 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1159 goto err; 1160 } 1161 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1162 1163 /* KerberosWrapper.EncryptedPreMasterSecret */ 1164 s2n(outl,p); 1165 memcpy(p, epms, outl); 1166 p+=outl; 1167 n+=outl + 2; 1168 1169 s->session->master_key_length= 1170 s->method->ssl3_enc->generate_master_secret(s, 1171 s->session->master_key, 1172 tmp_buf, sizeof tmp_buf); 1173 1174 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1175 OPENSSL_cleanse(epms, outl); 1176 } 1177#endif 1178#ifndef OPENSSL_NO_DH 1179 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1180 { 1181 DH *dh_srvr,*dh_clnt; 1182 1183 if (s->session->sess_cert->peer_dh_tmp != NULL) 1184 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1185 else 1186 { 1187 /* we get them from the cert */ 1188 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1189 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1190 goto err; 1191 } 1192 1193 /* generate a new random key */ 1194 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1195 { 1196 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1197 goto err; 1198 } 1199 if (!DH_generate_key(dh_clnt)) 1200 { 1201 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1202 goto err; 1203 } 1204 1205 /* use the 'p' output buffer for the DH key, but 1206 * make sure to clear it out afterwards */ 1207 1208 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1209 1210 if (n <= 0) 1211 { 1212 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1213 goto err; 1214 } 1215 1216 /* generate master key from the result */ 1217 s->session->master_key_length= 1218 s->method->ssl3_enc->generate_master_secret(s, 1219 s->session->master_key,p,n); 1220 /* clean up */ 1221 memset(p,0,n); 1222 1223 /* send off the data */ 1224 n=BN_num_bytes(dh_clnt->pub_key); 1225 s2n(n,p); 1226 BN_bn2bin(dh_clnt->pub_key,p); 1227 n+=2; 1228 1229 DH_free(dh_clnt); 1230 1231 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1232 } 1233#endif 1234#ifndef OPENSSL_NO_ECDH 1235 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1236 { 1237 const EC_GROUP *srvr_group = NULL; 1238 EC_KEY *tkey; 1239 int ecdh_clnt_cert = 0; 1240 int field_size = 0; 1241 1242 /* Did we send out the client's 1243 * ECDH share for use in premaster 1244 * computation as part of client certificate? 1245 * If so, set ecdh_clnt_cert to 1. 1246 */ 1247 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1248 { 1249 /* XXX: For now, we do not support client 1250 * authentication using ECDH certificates. 1251 * To add such support, one needs to add 1252 * code that checks for appropriate 1253 * conditions and sets ecdh_clnt_cert to 1. 1254 * For example, the cert have an ECC 1255 * key on the same curve as the server's 1256 * and the key should be authorized for 1257 * key agreement. 1258 * 1259 * One also needs to add code in ssl3_connect 1260 * to skip sending the certificate verify 1261 * message. 1262 * 1263 * if ((s->cert->key->privatekey != NULL) && 1264 * (s->cert->key->privatekey->type == 1265 * EVP_PKEY_EC) && ...) 1266 * ecdh_clnt_cert = 1; 1267 */ 1268 } 1269 1270 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1271 { 1272 tkey = s->session->sess_cert->peer_ecdh_tmp; 1273 } 1274 else 1275 { 1276 /* Get the Server Public Key from Cert */ 1277 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1278 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1279 if ((srvr_pub_pkey == NULL) || 1280 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1281 (srvr_pub_pkey->pkey.ec == NULL)) 1282 { 1283 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1284 ERR_R_INTERNAL_ERROR); 1285 goto err; 1286 } 1287 1288 tkey = srvr_pub_pkey->pkey.ec; 1289 } 1290 1291 srvr_group = EC_KEY_get0_group(tkey); 1292 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1293 1294 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1295 { 1296 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1297 ERR_R_INTERNAL_ERROR); 1298 goto err; 1299 } 1300 1301 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1302 { 1303 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1304 goto err; 1305 } 1306 1307 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1308 { 1309 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1310 goto err; 1311 } 1312 if (ecdh_clnt_cert) 1313 { 1314 /* Reuse key info from our certificate 1315 * We only need our private key to perform 1316 * the ECDH computation. 1317 */ 1318 const BIGNUM *priv_key; 1319 tkey = s->cert->key->privatekey->pkey.ec; 1320 priv_key = EC_KEY_get0_private_key(tkey); 1321 if (priv_key == NULL) 1322 { 1323 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1324 goto err; 1325 } 1326 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1327 { 1328 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1329 goto err; 1330 } 1331 } 1332 else 1333 { 1334 /* Generate a new ECDH key pair */ 1335 if (!(EC_KEY_generate_key(clnt_ecdh))) 1336 { 1337 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1338 goto err; 1339 } 1340 } 1341 1342 /* use the 'p' output buffer for the ECDH key, but 1343 * make sure to clear it out afterwards 1344 */ 1345 1346 field_size = EC_GROUP_get_degree(srvr_group); 1347 if (field_size <= 0) 1348 { 1349 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1350 ERR_R_ECDH_LIB); 1351 goto err; 1352 } 1353 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1354 if (n <= 0) 1355 { 1356 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1357 ERR_R_ECDH_LIB); 1358 goto err; 1359 } 1360 1361 /* generate master key from the result */ 1362 s->session->master_key_length = s->method->ssl3_enc \ 1363 -> generate_master_secret(s, 1364 s->session->master_key, 1365 p, n); 1366 1367 memset(p, 0, n); /* clean up */ 1368 1369 if (ecdh_clnt_cert) 1370 { 1371 /* Send empty client key exch message */ 1372 n = 0; 1373 } 1374 else 1375 { 1376 /* First check the size of encoding and 1377 * allocate memory accordingly. 1378 */ 1379 encoded_pt_len = 1380 EC_POINT_point2oct(srvr_group, 1381 EC_KEY_get0_public_key(clnt_ecdh), 1382 POINT_CONVERSION_UNCOMPRESSED, 1383 NULL, 0, NULL); 1384 1385 encodedPoint = (unsigned char *) 1386 OPENSSL_malloc(encoded_pt_len * 1387 sizeof(unsigned char)); 1388 bn_ctx = BN_CTX_new(); 1389 if ((encodedPoint == NULL) || 1390 (bn_ctx == NULL)) 1391 { 1392 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1393 goto err; 1394 } 1395 1396 /* Encode the public key */ 1397 n = EC_POINT_point2oct(srvr_group, 1398 EC_KEY_get0_public_key(clnt_ecdh), 1399 POINT_CONVERSION_UNCOMPRESSED, 1400 encodedPoint, encoded_pt_len, bn_ctx); 1401 1402 *p = n; /* length of encoded point */ 1403 /* Encoded point will be copied here */ 1404 p += 1; 1405 /* copy the point */ 1406 memcpy((unsigned char *)p, encodedPoint, n); 1407 /* increment n to account for length field */ 1408 n += 1; 1409 } 1410 1411 /* Free allocated memory */ 1412 BN_CTX_free(bn_ctx); 1413 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1414 if (clnt_ecdh != NULL) 1415 EC_KEY_free(clnt_ecdh); 1416 EVP_PKEY_free(srvr_pub_pkey); 1417 } 1418#endif /* !OPENSSL_NO_ECDH */ 1419 1420#ifndef OPENSSL_NO_PSK 1421 else if (alg_k & SSL_kPSK) 1422 { 1423 char identity[PSK_MAX_IDENTITY_LEN]; 1424 unsigned char *t = NULL; 1425 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1426 unsigned int pre_ms_len = 0, psk_len = 0; 1427 int psk_err = 1; 1428 1429 n = 0; 1430 if (s->psk_client_callback == NULL) 1431 { 1432 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1433 SSL_R_PSK_NO_CLIENT_CB); 1434 goto err; 1435 } 1436 1437 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1438 identity, PSK_MAX_IDENTITY_LEN, 1439 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1440 if (psk_len > PSK_MAX_PSK_LEN) 1441 { 1442 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1443 ERR_R_INTERNAL_ERROR); 1444 goto psk_err; 1445 } 1446 else if (psk_len == 0) 1447 { 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 = BUF_strdup(s->ctx->psk_identity_hint); 1465 if (s->ctx->psk_identity_hint != NULL && 1466 s->session->psk_identity_hint == NULL) 1467 { 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 { 1478 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1479 ERR_R_MALLOC_FAILURE); 1480 goto psk_err; 1481 } 1482 1483 s->session->master_key_length = 1484 s->method->ssl3_enc->generate_master_secret(s, 1485 s->session->master_key, 1486 psk_or_pre_ms, pre_ms_len); 1487 n = strlen(identity); 1488 s2n(n, p); 1489 memcpy(p, identity, n); 1490 n+=2; 1491 psk_err = 0; 1492 psk_err: 1493 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1494 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1495 if (psk_err != 0) 1496 { 1497 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1498 goto err; 1499 } 1500 } 1501#endif 1502 else 1503 { 1504 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1505 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,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)); 1529err: 1530#ifndef OPENSSL_NO_ECDH 1531 BN_CTX_free(bn_ctx); 1532 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1533 if (clnt_ecdh != NULL) 1534 EC_KEY_free(clnt_ecdh); 1535 EVP_PKEY_free(srvr_pub_pkey); 1536#endif 1537 return(-1); 1538 } 1539 1540int dtls1_send_client_verify(SSL *s) 1541 { 1542 unsigned char *p,*d; 1543 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1544 EVP_PKEY *pkey; 1545#ifndef OPENSSL_NO_RSA 1546 unsigned u=0; 1547#endif 1548 unsigned long n; 1549#if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1550 int j; 1551#endif 1552 1553 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1554 { 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 { 1566 s->method->ssl3_enc->cert_verify_mac(s, 1567 NID_md5, 1568 &(data[0])); 1569 if (RSA_sign(NID_md5_sha1, data, 1570 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1571 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1572 { 1573 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1574 goto err; 1575 } 1576 s2n(u,p); 1577 n=u+2; 1578 } 1579 else 1580#endif 1581#ifndef OPENSSL_NO_DSA 1582 if (pkey->type == EVP_PKEY_DSA) 1583 { 1584 if (!DSA_sign(pkey->save_type, 1585 &(data[MD5_DIGEST_LENGTH]), 1586 SHA_DIGEST_LENGTH,&(p[2]), 1587 (unsigned int *)&j,pkey->pkey.dsa)) 1588 { 1589 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1590 goto err; 1591 } 1592 s2n(j,p); 1593 n=j+2; 1594 } 1595 else 1596#endif 1597#ifndef OPENSSL_NO_ECDSA 1598 if (pkey->type == EVP_PKEY_EC) 1599 { 1600 if (!ECDSA_sign(pkey->save_type, 1601 &(data[MD5_DIGEST_LENGTH]), 1602 SHA_DIGEST_LENGTH,&(p[2]), 1603 (unsigned int *)&j,pkey->pkey.ec)) 1604 { 1605 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1606 ERR_R_ECDSA_LIB); 1607 goto err; 1608 } 1609 s2n(j,p); 1610 n=j+2; 1611 } 1612 else 1613#endif 1614 { 1615 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1616 goto err; 1617 } 1618 1619 d = dtls1_set_message_header(s, d, 1620 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1621 1622 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1623 s->init_off=0; 1624 1625 /* buffer the message to handle re-xmits */ 1626 dtls1_buffer_message(s, 0); 1627 1628 s->state = SSL3_ST_CW_CERT_VRFY_B; 1629 } 1630 1631 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1632 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1633err: 1634 return(-1); 1635 } 1636 1637int dtls1_send_client_certificate(SSL *s) 1638 { 1639 X509 *x509=NULL; 1640 EVP_PKEY *pkey=NULL; 1641 int i; 1642 unsigned long l; 1643 1644 if (s->state == SSL3_ST_CW_CERT_A) 1645 { 1646 if ((s->cert == NULL) || 1647 (s->cert->key->x509 == NULL) || 1648 (s->cert->key->privatekey == NULL)) 1649 s->state=SSL3_ST_CW_CERT_B; 1650 else 1651 s->state=SSL3_ST_CW_CERT_C; 1652 } 1653 1654 /* We need to get a client cert */ 1655 if (s->state == SSL3_ST_CW_CERT_B) 1656 { 1657 /* If we get an error, we need to 1658 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1659 * We then get retied later */ 1660 i=0; 1661 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1662 if (i < 0) 1663 { 1664 s->rwstate=SSL_X509_LOOKUP; 1665 return(-1); 1666 } 1667 s->rwstate=SSL_NOTHING; 1668 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1669 { 1670 s->state=SSL3_ST_CW_CERT_B; 1671 if ( !SSL_use_certificate(s,x509) || 1672 !SSL_use_PrivateKey(s,pkey)) 1673 i=0; 1674 } 1675 else if (i == 1) 1676 { 1677 i=0; 1678 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1679 } 1680 1681 if (x509 != NULL) X509_free(x509); 1682 if (pkey != NULL) EVP_PKEY_free(pkey); 1683 if (i == 0) 1684 { 1685 if (s->version == SSL3_VERSION) 1686 { 1687 s->s3->tmp.cert_req=0; 1688 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1689 return(1); 1690 } 1691 else 1692 { 1693 s->s3->tmp.cert_req=2; 1694 } 1695 } 1696 1697 /* Ok, we have a cert */ 1698 s->state=SSL3_ST_CW_CERT_C; 1699 } 1700 1701 if (s->state == SSL3_ST_CW_CERT_C) 1702 { 1703 s->state=SSL3_ST_CW_CERT_D; 1704 l=dtls1_output_cert_chain(s, 1705 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1706 s->init_num=(int)l; 1707 s->init_off=0; 1708 1709 /* set header called by dtls1_output_cert_chain() */ 1710 1711 /* buffer the message to handle re-xmits */ 1712 dtls1_buffer_message(s, 0); 1713 } 1714 /* SSL3_ST_CW_CERT_D */ 1715 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1716 } 1717 1718 1719