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 130 131 static const SSL_METHOD *dtls1_get_client_method(int ver); 132 static int dtls1_get_hello_verify(SSL *s); 133 134 static 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 } 141 142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method, 143 ssl_undefined_function, 144 dtls1_connect, 145 dtls1_get_client_method) 146 147 int 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 #ifndef OPENSSL_NO_SCTP 542 /* Change to new shared key of SCTP-Auth, 543 * will be ignored if no SCTP used. 544 */ 545 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 546 #endif 547 548 s->state=SSL3_ST_CW_FINISHED_A; 549 s->init_num=0; 550 551 s->session->cipher=s->s3->tmp.new_cipher; 552 #ifdef OPENSSL_NO_COMP 553 s->session->compress_meth=0; 554 #else 555 if (s->s3->tmp.new_compression == NULL) 556 s->session->compress_meth=0; 557 else 558 s->session->compress_meth= 559 s->s3->tmp.new_compression->id; 560 #endif 561 if (!s->method->ssl3_enc->setup_key_block(s)) 562 { 563 ret= -1; 564 goto end; 565 } 566 567 if (!s->method->ssl3_enc->change_cipher_state(s, 568 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 569 { 570 ret= -1; 571 goto end; 572 } 573 574 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 575 break; 576 577 case SSL3_ST_CW_FINISHED_A: 578 case SSL3_ST_CW_FINISHED_B: 579 if (!s->hit) 580 dtls1_start_timer(s); 581 ret=dtls1_send_finished(s, 582 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 583 s->method->ssl3_enc->client_finished_label, 584 s->method->ssl3_enc->client_finished_label_len); 585 if (ret <= 0) goto end; 586 s->state=SSL3_ST_CW_FLUSH; 587 588 /* clear flags */ 589 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 590 if (s->hit) 591 { 592 s->s3->tmp.next_state=SSL_ST_OK; 593 #ifndef OPENSSL_NO_SCTP 594 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 595 { 596 s->d1->next_state = s->s3->tmp.next_state; 597 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 598 } 599 #endif 600 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) 601 { 602 s->state=SSL_ST_OK; 603 #ifndef OPENSSL_NO_SCTP 604 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 605 { 606 s->d1->next_state = SSL_ST_OK; 607 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 608 } 609 #endif 610 s->s3->flags|=SSL3_FLAGS_POP_BUFFER; 611 s->s3->delay_buf_pop_ret=0; 612 } 613 } 614 else 615 { 616 #ifndef OPENSSL_NO_TLSEXT 617 /* Allow NewSessionTicket if ticket expected */ 618 if (s->tlsext_ticket_expected) 619 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 620 else 621 #endif 622 623 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A; 624 } 625 s->init_num=0; 626 break; 627 628 #ifndef OPENSSL_NO_TLSEXT 629 case SSL3_ST_CR_SESSION_TICKET_A: 630 case SSL3_ST_CR_SESSION_TICKET_B: 631 ret=ssl3_get_new_session_ticket(s); 632 if (ret <= 0) goto end; 633 s->state=SSL3_ST_CR_FINISHED_A; 634 s->init_num=0; 635 break; 636 637 case SSL3_ST_CR_CERT_STATUS_A: 638 case SSL3_ST_CR_CERT_STATUS_B: 639 ret=ssl3_get_cert_status(s); 640 if (ret <= 0) goto end; 641 s->state=SSL3_ST_CR_KEY_EXCH_A; 642 s->init_num=0; 643 break; 644 #endif 645 646 case SSL3_ST_CR_FINISHED_A: 647 case SSL3_ST_CR_FINISHED_B: 648 s->d1->change_cipher_spec_ok = 1; 649 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 650 SSL3_ST_CR_FINISHED_B); 651 if (ret <= 0) goto end; 652 dtls1_stop_timer(s); 653 654 if (s->hit) 655 s->state=SSL3_ST_CW_CHANGE_A; 656 else 657 s->state=SSL_ST_OK; 658 659 #ifndef OPENSSL_NO_SCTP 660 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 661 state == SSL_ST_RENEGOTIATE) 662 { 663 s->d1->next_state=s->state; 664 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK; 665 } 666 #endif 667 668 s->init_num=0; 669 break; 670 671 case SSL3_ST_CW_FLUSH: 672 s->rwstate=SSL_WRITING; 673 if (BIO_flush(s->wbio) <= 0) 674 { 675 /* If the write error was fatal, stop trying */ 676 if (!BIO_should_retry(s->wbio)) 677 { 678 s->rwstate=SSL_NOTHING; 679 s->state=s->s3->tmp.next_state; 680 } 681 682 ret= -1; 683 goto end; 684 } 685 s->rwstate=SSL_NOTHING; 686 s->state=s->s3->tmp.next_state; 687 break; 688 689 case SSL_ST_OK: 690 /* clean a few things up */ 691 ssl3_cleanup_key_block(s); 692 693 #if 0 694 if (s->init_buf != NULL) 695 { 696 BUF_MEM_free(s->init_buf); 697 s->init_buf=NULL; 698 } 699 #endif 700 701 /* If we are not 'joining' the last two packets, 702 * remove the buffering now */ 703 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 704 ssl_free_wbio_buffer(s); 705 /* else do it later in ssl3_write */ 706 707 s->init_num=0; 708 s->renegotiate=0; 709 s->new_session=0; 710 711 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 712 if (s->hit) s->ctx->stats.sess_hit++; 713 714 ret=1; 715 /* s->server=0; */ 716 s->handshake_func=dtls1_connect; 717 s->ctx->stats.sess_connect_good++; 718 719 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 720 721 /* done with handshaking */ 722 s->d1->handshake_read_seq = 0; 723 s->d1->next_handshake_write_seq = 0; 724 goto end; 725 /* break; */ 726 727 default: 728 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE); 729 ret= -1; 730 goto end; 731 /* break; */ 732 } 733 734 /* did we do anything */ 735 if (!s->s3->tmp.reuse_message && !skip) 736 { 737 if (s->debug) 738 { 739 if ((ret=BIO_flush(s->wbio)) <= 0) 740 goto end; 741 } 742 743 if ((cb != NULL) && (s->state != state)) 744 { 745 new_state=s->state; 746 s->state=state; 747 cb(s,SSL_CB_CONNECT_LOOP,1); 748 s->state=new_state; 749 } 750 } 751 skip=0; 752 } 753 end: 754 s->in_handshake--; 755 756 #ifndef OPENSSL_NO_SCTP 757 /* Notify SCTP BIO socket to leave handshake 758 * mode and allow stream identifier other 759 * than 0. Will be ignored if no SCTP is used. 760 */ 761 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 762 #endif 763 764 if (buf != NULL) 765 BUF_MEM_free(buf); 766 if (cb != NULL) 767 cb(s,SSL_CB_CONNECT_EXIT,ret); 768 return(ret); 769 } 770 771 int dtls1_client_hello(SSL *s) 772 { 773 unsigned char *buf; 774 unsigned char *p,*d; 775 unsigned int i,j; 776 unsigned long Time,l; 777 SSL_COMP *comp; 778 779 buf=(unsigned char *)s->init_buf->data; 780 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 781 { 782 SSL_SESSION *sess = s->session; 783 if ((s->session == NULL) || 784 (s->session->ssl_version != s->version) || 785 #ifdef OPENSSL_NO_TLSEXT 786 !sess->session_id_length || 787 #else 788 (!sess->session_id_length && !sess->tlsext_tick) || 789 #endif 790 (s->session->not_resumable)) 791 { 792 if (!ssl_get_new_session(s,0)) 793 goto err; 794 } 795 /* else use the pre-loaded session */ 796 797 p=s->s3->client_random; 798 799 /* if client_random is initialized, reuse it, we are 800 * required to use same upon reply to HelloVerify */ 801 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ; 802 if (i==sizeof(s->s3->client_random)) 803 { 804 Time=(unsigned long)time(NULL); /* Time */ 805 l2n(Time,p); 806 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4); 807 } 808 809 /* Do the message type and length last */ 810 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 811 812 *(p++)=s->version>>8; 813 *(p++)=s->version&0xff; 814 s->client_version=s->version; 815 816 /* Random stuff */ 817 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 818 p+=SSL3_RANDOM_SIZE; 819 820 /* Session ID */ 821 if (s->new_session) 822 i=0; 823 else 824 i=s->session->session_id_length; 825 *(p++)=i; 826 if (i != 0) 827 { 828 if (i > sizeof s->session->session_id) 829 { 830 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 831 goto err; 832 } 833 memcpy(p,s->session->session_id,i); 834 p+=i; 835 } 836 837 /* cookie stuff */ 838 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 839 { 840 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 841 goto err; 842 } 843 *(p++) = s->d1->cookie_len; 844 memcpy(p, s->d1->cookie, s->d1->cookie_len); 845 p += s->d1->cookie_len; 846 847 /* Ciphers supported */ 848 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 849 if (i == 0) 850 { 851 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 852 goto err; 853 } 854 s2n(i,p); 855 p+=i; 856 857 /* COMPRESSION */ 858 if (s->ctx->comp_methods == NULL) 859 j=0; 860 else 861 j=sk_SSL_COMP_num(s->ctx->comp_methods); 862 *(p++)=1+j; 863 for (i=0; i<j; i++) 864 { 865 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 866 *(p++)=comp->id; 867 } 868 *(p++)=0; /* Add the NULL method */ 869 870 #ifndef OPENSSL_NO_TLSEXT 871 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 872 { 873 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 874 goto err; 875 } 876 #endif 877 878 l=(p-d); 879 d=buf; 880 881 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 882 883 s->state=SSL3_ST_CW_CLNT_HELLO_B; 884 /* number of bytes to write */ 885 s->init_num=p-buf; 886 s->init_off=0; 887 888 /* buffer the message to handle re-xmits */ 889 dtls1_buffer_message(s, 0); 890 } 891 892 /* SSL3_ST_CW_CLNT_HELLO_B */ 893 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 894 err: 895 return(-1); 896 } 897 898 static int dtls1_get_hello_verify(SSL *s) 899 { 900 int n, al, ok = 0; 901 unsigned char *data; 902 unsigned int cookie_len; 903 904 n=s->method->ssl_get_message(s, 905 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 906 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 907 -1, 908 s->max_cert_list, 909 &ok); 910 911 if (!ok) return((int)n); 912 913 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 914 { 915 s->d1->send_cookie = 0; 916 s->s3->tmp.reuse_message=1; 917 return(1); 918 } 919 920 data = (unsigned char *)s->init_msg; 921 922 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 923 { 924 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 925 s->version=(s->version&0xff00)|data[1]; 926 al = SSL_AD_PROTOCOL_VERSION; 927 goto f_err; 928 } 929 data+=2; 930 931 cookie_len = *(data++); 932 if ( cookie_len > sizeof(s->d1->cookie)) 933 { 934 al=SSL_AD_ILLEGAL_PARAMETER; 935 goto f_err; 936 } 937 938 memcpy(s->d1->cookie, data, cookie_len); 939 s->d1->cookie_len = cookie_len; 940 941 s->d1->send_cookie = 1; 942 return 1; 943 944 f_err: 945 ssl3_send_alert(s, SSL3_AL_FATAL, al); 946 return -1; 947 } 948 949 int dtls1_send_client_key_exchange(SSL *s) 950 { 951 unsigned char *p,*d; 952 int n; 953 unsigned long alg_k; 954 #ifndef OPENSSL_NO_RSA 955 unsigned char *q; 956 EVP_PKEY *pkey=NULL; 957 #endif 958 #ifndef OPENSSL_NO_KRB5 959 KSSL_ERR kssl_err; 960 #endif /* OPENSSL_NO_KRB5 */ 961 #ifndef OPENSSL_NO_ECDH 962 EC_KEY *clnt_ecdh = NULL; 963 const EC_POINT *srvr_ecpoint = NULL; 964 EVP_PKEY *srvr_pub_pkey = NULL; 965 unsigned char *encodedPoint = NULL; 966 int encoded_pt_len = 0; 967 BN_CTX * bn_ctx = NULL; 968 #endif 969 970 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 971 { 972 d=(unsigned char *)s->init_buf->data; 973 p= &(d[DTLS1_HM_HEADER_LENGTH]); 974 975 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 976 977 /* Fool emacs indentation */ 978 if (0) {} 979 #ifndef OPENSSL_NO_RSA 980 else if (alg_k & SSL_kRSA) 981 { 982 RSA *rsa; 983 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 984 985 if (s->session->sess_cert->peer_rsa_tmp != NULL) 986 rsa=s->session->sess_cert->peer_rsa_tmp; 987 else 988 { 989 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 990 if ((pkey == NULL) || 991 (pkey->type != EVP_PKEY_RSA) || 992 (pkey->pkey.rsa == NULL)) 993 { 994 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 995 goto err; 996 } 997 rsa=pkey->pkey.rsa; 998 EVP_PKEY_free(pkey); 999 } 1000 1001 tmp_buf[0]=s->client_version>>8; 1002 tmp_buf[1]=s->client_version&0xff; 1003 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 1004 goto err; 1005 1006 s->session->master_key_length=sizeof tmp_buf; 1007 1008 q=p; 1009 /* Fix buf for TLS and [incidentally] DTLS */ 1010 if (s->version > SSL3_VERSION) 1011 p+=2; 1012 n=RSA_public_encrypt(sizeof tmp_buf, 1013 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 1014 #ifdef PKCS1_CHECK 1015 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 1016 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 1017 #endif 1018 if (n <= 0) 1019 { 1020 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 1021 goto err; 1022 } 1023 1024 /* Fix buf for TLS and [incidentally] DTLS */ 1025 if (s->version > SSL3_VERSION) 1026 { 1027 s2n(n,q); 1028 n+=2; 1029 } 1030 1031 s->session->master_key_length= 1032 s->method->ssl3_enc->generate_master_secret(s, 1033 s->session->master_key, 1034 tmp_buf,sizeof tmp_buf); 1035 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 1036 } 1037 #endif 1038 #ifndef OPENSSL_NO_KRB5 1039 else if (alg_k & SSL_kKRB5) 1040 { 1041 krb5_error_code krb5rc; 1042 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1043 /* krb5_data krb5_ap_req; */ 1044 krb5_data *enc_ticket; 1045 krb5_data authenticator, *authp = NULL; 1046 EVP_CIPHER_CTX ciph_ctx; 1047 const EVP_CIPHER *enc = NULL; 1048 unsigned char iv[EVP_MAX_IV_LENGTH]; 1049 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1050 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 1051 + EVP_MAX_IV_LENGTH]; 1052 int padl, outl = sizeof(epms); 1053 1054 EVP_CIPHER_CTX_init(&ciph_ctx); 1055 1056 #ifdef KSSL_DEBUG 1057 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1058 alg_k, SSL_kKRB5); 1059 #endif /* KSSL_DEBUG */ 1060 1061 authp = NULL; 1062 #ifdef KRB5SENDAUTH 1063 if (KRB5SENDAUTH) authp = &authenticator; 1064 #endif /* KRB5SENDAUTH */ 1065 1066 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 1067 &kssl_err); 1068 enc = kssl_map_enc(kssl_ctx->enctype); 1069 if (enc == NULL) 1070 goto err; 1071 #ifdef KSSL_DEBUG 1072 { 1073 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1074 if (krb5rc && kssl_err.text) 1075 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1076 } 1077 #endif /* KSSL_DEBUG */ 1078 1079 if (krb5rc) 1080 { 1081 ssl3_send_alert(s,SSL3_AL_FATAL, 1082 SSL_AD_HANDSHAKE_FAILURE); 1083 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1084 kssl_err.reason); 1085 goto err; 1086 } 1087 1088 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 1089 ** in place of RFC 2712 KerberosWrapper, as in: 1090 ** 1091 ** Send ticket (copy to *p, set n = length) 1092 ** n = krb5_ap_req.length; 1093 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1094 ** if (krb5_ap_req.data) 1095 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1096 ** 1097 ** Now using real RFC 2712 KerberosWrapper 1098 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 1099 ** Note: 2712 "opaque" types are here replaced 1100 ** with a 2-byte length followed by the value. 1101 ** Example: 1102 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1103 ** Where "xx xx" = length bytes. Shown here with 1104 ** optional authenticator omitted. 1105 */ 1106 1107 /* KerberosWrapper.Ticket */ 1108 s2n(enc_ticket->length,p); 1109 memcpy(p, enc_ticket->data, enc_ticket->length); 1110 p+= enc_ticket->length; 1111 n = enc_ticket->length + 2; 1112 1113 /* KerberosWrapper.Authenticator */ 1114 if (authp && authp->length) 1115 { 1116 s2n(authp->length,p); 1117 memcpy(p, authp->data, authp->length); 1118 p+= authp->length; 1119 n+= authp->length + 2; 1120 1121 free(authp->data); 1122 authp->data = NULL; 1123 authp->length = 0; 1124 } 1125 else 1126 { 1127 s2n(0,p);/* null authenticator length */ 1128 n+=2; 1129 } 1130 1131 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 1132 goto err; 1133 1134 /* 20010420 VRS. Tried it this way; failed. 1135 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1136 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1137 ** kssl_ctx->length); 1138 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1139 */ 1140 1141 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1142 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 1143 kssl_ctx->key,iv); 1144 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 1145 sizeof tmp_buf); 1146 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 1147 outl += padl; 1148 if (outl > (int)sizeof epms) 1149 { 1150 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1151 goto err; 1152 } 1153 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1154 1155 /* KerberosWrapper.EncryptedPreMasterSecret */ 1156 s2n(outl,p); 1157 memcpy(p, epms, outl); 1158 p+=outl; 1159 n+=outl + 2; 1160 1161 s->session->master_key_length= 1162 s->method->ssl3_enc->generate_master_secret(s, 1163 s->session->master_key, 1164 tmp_buf, sizeof tmp_buf); 1165 1166 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1167 OPENSSL_cleanse(epms, outl); 1168 } 1169 #endif 1170 #ifndef OPENSSL_NO_DH 1171 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1172 { 1173 DH *dh_srvr,*dh_clnt; 1174 1175 if (s->session->sess_cert->peer_dh_tmp != NULL) 1176 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1177 else 1178 { 1179 /* we get them from the cert */ 1180 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1181 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1182 goto err; 1183 } 1184 1185 /* generate a new random key */ 1186 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1187 { 1188 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1189 goto err; 1190 } 1191 if (!DH_generate_key(dh_clnt)) 1192 { 1193 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1194 goto err; 1195 } 1196 1197 /* use the 'p' output buffer for the DH key, but 1198 * make sure to clear it out afterwards */ 1199 1200 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1201 1202 if (n <= 0) 1203 { 1204 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1205 goto err; 1206 } 1207 1208 /* generate master key from the result */ 1209 s->session->master_key_length= 1210 s->method->ssl3_enc->generate_master_secret(s, 1211 s->session->master_key,p,n); 1212 /* clean up */ 1213 memset(p,0,n); 1214 1215 /* send off the data */ 1216 n=BN_num_bytes(dh_clnt->pub_key); 1217 s2n(n,p); 1218 BN_bn2bin(dh_clnt->pub_key,p); 1219 n+=2; 1220 1221 DH_free(dh_clnt); 1222 1223 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1224 } 1225 #endif 1226 #ifndef OPENSSL_NO_ECDH 1227 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1228 { 1229 const EC_GROUP *srvr_group = NULL; 1230 EC_KEY *tkey; 1231 int ecdh_clnt_cert = 0; 1232 int field_size = 0; 1233 1234 /* Did we send out the client's 1235 * ECDH share for use in premaster 1236 * computation as part of client certificate? 1237 * If so, set ecdh_clnt_cert to 1. 1238 */ 1239 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1240 { 1241 /* XXX: For now, we do not support client 1242 * authentication using ECDH certificates. 1243 * To add such support, one needs to add 1244 * code that checks for appropriate 1245 * conditions and sets ecdh_clnt_cert to 1. 1246 * For example, the cert have an ECC 1247 * key on the same curve as the server's 1248 * and the key should be authorized for 1249 * key agreement. 1250 * 1251 * One also needs to add code in ssl3_connect 1252 * to skip sending the certificate verify 1253 * message. 1254 * 1255 * if ((s->cert->key->privatekey != NULL) && 1256 * (s->cert->key->privatekey->type == 1257 * EVP_PKEY_EC) && ...) 1258 * ecdh_clnt_cert = 1; 1259 */ 1260 } 1261 1262 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1263 { 1264 tkey = s->session->sess_cert->peer_ecdh_tmp; 1265 } 1266 else 1267 { 1268 /* Get the Server Public Key from Cert */ 1269 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1270 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1271 if ((srvr_pub_pkey == NULL) || 1272 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1273 (srvr_pub_pkey->pkey.ec == NULL)) 1274 { 1275 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1276 ERR_R_INTERNAL_ERROR); 1277 goto err; 1278 } 1279 1280 tkey = srvr_pub_pkey->pkey.ec; 1281 } 1282 1283 srvr_group = EC_KEY_get0_group(tkey); 1284 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1285 1286 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1287 { 1288 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1289 ERR_R_INTERNAL_ERROR); 1290 goto err; 1291 } 1292 1293 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1294 { 1295 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1296 goto err; 1297 } 1298 1299 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1300 { 1301 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1302 goto err; 1303 } 1304 if (ecdh_clnt_cert) 1305 { 1306 /* Reuse key info from our certificate 1307 * We only need our private key to perform 1308 * the ECDH computation. 1309 */ 1310 const BIGNUM *priv_key; 1311 tkey = s->cert->key->privatekey->pkey.ec; 1312 priv_key = EC_KEY_get0_private_key(tkey); 1313 if (priv_key == NULL) 1314 { 1315 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1316 goto err; 1317 } 1318 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1319 { 1320 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1321 goto err; 1322 } 1323 } 1324 else 1325 { 1326 /* Generate a new ECDH key pair */ 1327 if (!(EC_KEY_generate_key(clnt_ecdh))) 1328 { 1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1330 goto err; 1331 } 1332 } 1333 1334 /* use the 'p' output buffer for the ECDH key, but 1335 * make sure to clear it out afterwards 1336 */ 1337 1338 field_size = EC_GROUP_get_degree(srvr_group); 1339 if (field_size <= 0) 1340 { 1341 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1342 ERR_R_ECDH_LIB); 1343 goto err; 1344 } 1345 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1346 if (n <= 0) 1347 { 1348 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1349 ERR_R_ECDH_LIB); 1350 goto err; 1351 } 1352 1353 /* generate master key from the result */ 1354 s->session->master_key_length = s->method->ssl3_enc \ 1355 -> generate_master_secret(s, 1356 s->session->master_key, 1357 p, n); 1358 1359 memset(p, 0, n); /* clean up */ 1360 1361 if (ecdh_clnt_cert) 1362 { 1363 /* Send empty client key exch message */ 1364 n = 0; 1365 } 1366 else 1367 { 1368 /* First check the size of encoding and 1369 * allocate memory accordingly. 1370 */ 1371 encoded_pt_len = 1372 EC_POINT_point2oct(srvr_group, 1373 EC_KEY_get0_public_key(clnt_ecdh), 1374 POINT_CONVERSION_UNCOMPRESSED, 1375 NULL, 0, NULL); 1376 1377 encodedPoint = (unsigned char *) 1378 OPENSSL_malloc(encoded_pt_len * 1379 sizeof(unsigned char)); 1380 bn_ctx = BN_CTX_new(); 1381 if ((encodedPoint == NULL) || 1382 (bn_ctx == NULL)) 1383 { 1384 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1385 goto err; 1386 } 1387 1388 /* Encode the public key */ 1389 n = EC_POINT_point2oct(srvr_group, 1390 EC_KEY_get0_public_key(clnt_ecdh), 1391 POINT_CONVERSION_UNCOMPRESSED, 1392 encodedPoint, encoded_pt_len, bn_ctx); 1393 1394 *p = n; /* length of encoded point */ 1395 /* Encoded point will be copied here */ 1396 p += 1; 1397 /* copy the point */ 1398 memcpy((unsigned char *)p, encodedPoint, n); 1399 /* increment n to account for length field */ 1400 n += 1; 1401 } 1402 1403 /* Free allocated memory */ 1404 BN_CTX_free(bn_ctx); 1405 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1406 if (clnt_ecdh != NULL) 1407 EC_KEY_free(clnt_ecdh); 1408 EVP_PKEY_free(srvr_pub_pkey); 1409 } 1410 #endif /* !OPENSSL_NO_ECDH */ 1411 1412 #ifndef OPENSSL_NO_PSK 1413 else if (alg_k & SSL_kPSK) 1414 { 1415 char identity[PSK_MAX_IDENTITY_LEN]; 1416 unsigned char *t = NULL; 1417 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1418 unsigned int pre_ms_len = 0, psk_len = 0; 1419 int psk_err = 1; 1420 1421 n = 0; 1422 if (s->psk_client_callback == NULL) 1423 { 1424 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1425 SSL_R_PSK_NO_CLIENT_CB); 1426 goto err; 1427 } 1428 1429 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint, 1430 identity, PSK_MAX_IDENTITY_LEN, 1431 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1432 if (psk_len > PSK_MAX_PSK_LEN) 1433 { 1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1435 ERR_R_INTERNAL_ERROR); 1436 goto psk_err; 1437 } 1438 else if (psk_len == 0) 1439 { 1440 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1441 SSL_R_PSK_IDENTITY_NOT_FOUND); 1442 goto psk_err; 1443 } 1444 1445 /* create PSK pre_master_secret */ 1446 pre_ms_len = 2+psk_len+2+psk_len; 1447 t = psk_or_pre_ms; 1448 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1449 s2n(psk_len, t); 1450 memset(t, 0, psk_len); 1451 t+=psk_len; 1452 s2n(psk_len, t); 1453 1454 if (s->session->psk_identity_hint != NULL) 1455 OPENSSL_free(s->session->psk_identity_hint); 1456 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint); 1457 if (s->ctx->psk_identity_hint != NULL && 1458 s->session->psk_identity_hint == NULL) 1459 { 1460 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1461 ERR_R_MALLOC_FAILURE); 1462 goto psk_err; 1463 } 1464 1465 if (s->session->psk_identity != NULL) 1466 OPENSSL_free(s->session->psk_identity); 1467 s->session->psk_identity = BUF_strdup(identity); 1468 if (s->session->psk_identity == NULL) 1469 { 1470 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1471 ERR_R_MALLOC_FAILURE); 1472 goto psk_err; 1473 } 1474 1475 s->session->master_key_length = 1476 s->method->ssl3_enc->generate_master_secret(s, 1477 s->session->master_key, 1478 psk_or_pre_ms, pre_ms_len); 1479 n = strlen(identity); 1480 s2n(n, p); 1481 memcpy(p, identity, n); 1482 n+=2; 1483 psk_err = 0; 1484 psk_err: 1485 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1486 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1487 if (psk_err != 0) 1488 { 1489 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1490 goto err; 1491 } 1492 } 1493 #endif 1494 else 1495 { 1496 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1497 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1498 goto err; 1499 } 1500 1501 d = dtls1_set_message_header(s, d, 1502 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1503 /* 1504 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1505 l2n3(n,d); 1506 l2n(s->d1->handshake_write_seq,d); 1507 s->d1->handshake_write_seq++; 1508 */ 1509 1510 s->state=SSL3_ST_CW_KEY_EXCH_B; 1511 /* number of bytes to write */ 1512 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1513 s->init_off=0; 1514 1515 /* buffer the message to handle re-xmits */ 1516 dtls1_buffer_message(s, 0); 1517 } 1518 1519 /* SSL3_ST_CW_KEY_EXCH_B */ 1520 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1521 err: 1522 #ifndef OPENSSL_NO_ECDH 1523 BN_CTX_free(bn_ctx); 1524 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1525 if (clnt_ecdh != NULL) 1526 EC_KEY_free(clnt_ecdh); 1527 EVP_PKEY_free(srvr_pub_pkey); 1528 #endif 1529 return(-1); 1530 } 1531 1532 int dtls1_send_client_verify(SSL *s) 1533 { 1534 unsigned char *p,*d; 1535 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1536 EVP_PKEY *pkey; 1537 #ifndef OPENSSL_NO_RSA 1538 unsigned u=0; 1539 #endif 1540 unsigned long n; 1541 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1542 int j; 1543 #endif 1544 1545 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1546 { 1547 d=(unsigned char *)s->init_buf->data; 1548 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1549 pkey=s->cert->key->privatekey; 1550 1551 s->method->ssl3_enc->cert_verify_mac(s, 1552 NID_sha1, 1553 &(data[MD5_DIGEST_LENGTH])); 1554 1555 #ifndef OPENSSL_NO_RSA 1556 if (pkey->type == EVP_PKEY_RSA) 1557 { 1558 s->method->ssl3_enc->cert_verify_mac(s, 1559 NID_md5, 1560 &(data[0])); 1561 if (RSA_sign(NID_md5_sha1, data, 1562 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1563 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1564 { 1565 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1566 goto err; 1567 } 1568 s2n(u,p); 1569 n=u+2; 1570 } 1571 else 1572 #endif 1573 #ifndef OPENSSL_NO_DSA 1574 if (pkey->type == EVP_PKEY_DSA) 1575 { 1576 if (!DSA_sign(pkey->save_type, 1577 &(data[MD5_DIGEST_LENGTH]), 1578 SHA_DIGEST_LENGTH,&(p[2]), 1579 (unsigned int *)&j,pkey->pkey.dsa)) 1580 { 1581 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1582 goto err; 1583 } 1584 s2n(j,p); 1585 n=j+2; 1586 } 1587 else 1588 #endif 1589 #ifndef OPENSSL_NO_ECDSA 1590 if (pkey->type == EVP_PKEY_EC) 1591 { 1592 if (!ECDSA_sign(pkey->save_type, 1593 &(data[MD5_DIGEST_LENGTH]), 1594 SHA_DIGEST_LENGTH,&(p[2]), 1595 (unsigned int *)&j,pkey->pkey.ec)) 1596 { 1597 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1598 ERR_R_ECDSA_LIB); 1599 goto err; 1600 } 1601 s2n(j,p); 1602 n=j+2; 1603 } 1604 else 1605 #endif 1606 { 1607 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1608 goto err; 1609 } 1610 1611 d = dtls1_set_message_header(s, d, 1612 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1613 1614 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1615 s->init_off=0; 1616 1617 /* buffer the message to handle re-xmits */ 1618 dtls1_buffer_message(s, 0); 1619 1620 s->state = SSL3_ST_CW_CERT_VRFY_B; 1621 } 1622 1623 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1624 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1625 err: 1626 return(-1); 1627 } 1628 1629 int dtls1_send_client_certificate(SSL *s) 1630 { 1631 X509 *x509=NULL; 1632 EVP_PKEY *pkey=NULL; 1633 int i; 1634 unsigned long l; 1635 1636 if (s->state == SSL3_ST_CW_CERT_A) 1637 { 1638 if ((s->cert == NULL) || 1639 (s->cert->key->x509 == NULL) || 1640 (s->cert->key->privatekey == NULL)) 1641 s->state=SSL3_ST_CW_CERT_B; 1642 else 1643 s->state=SSL3_ST_CW_CERT_C; 1644 } 1645 1646 /* We need to get a client cert */ 1647 if (s->state == SSL3_ST_CW_CERT_B) 1648 { 1649 /* If we get an error, we need to 1650 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1651 * We then get retied later */ 1652 i=0; 1653 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1654 if (i < 0) 1655 { 1656 s->rwstate=SSL_X509_LOOKUP; 1657 return(-1); 1658 } 1659 s->rwstate=SSL_NOTHING; 1660 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1661 { 1662 s->state=SSL3_ST_CW_CERT_B; 1663 if ( !SSL_use_certificate(s,x509) || 1664 !SSL_use_PrivateKey(s,pkey)) 1665 i=0; 1666 } 1667 else if (i == 1) 1668 { 1669 i=0; 1670 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1671 } 1672 1673 if (x509 != NULL) X509_free(x509); 1674 if (pkey != NULL) EVP_PKEY_free(pkey); 1675 if (i == 0) 1676 { 1677 if (s->version == SSL3_VERSION) 1678 { 1679 s->s3->tmp.cert_req=0; 1680 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1681 return(1); 1682 } 1683 else 1684 { 1685 s->s3->tmp.cert_req=2; 1686 } 1687 } 1688 1689 /* Ok, we have a cert */ 1690 s->state=SSL3_ST_CW_CERT_C; 1691 } 1692 1693 if (s->state == SSL3_ST_CW_CERT_C) 1694 { 1695 s->state=SSL3_ST_CW_CERT_D; 1696 l=dtls1_output_cert_chain(s, 1697 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1698 s->init_num=(int)l; 1699 s->init_off=0; 1700 1701 /* set header called by dtls1_output_cert_chain() */ 1702 1703 /* buffer the message to handle re-xmits */ 1704 dtls1_buffer_message(s, 0); 1705 } 1706 /* SSL3_ST_CW_CERT_D */ 1707 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1708 } 1709 1710 1711