1 /* ssl/d1_clnt.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 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 } 763 end: 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 } 780 781 int 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 (!s->session_creation_enabled) 803 { 804 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 805 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 806 goto err; 807 } 808 if (!ssl_get_new_session(s,0)) 809 goto err; 810 } 811 /* else use the pre-loaded session */ 812 813 p=s->s3->client_random; 814 815 /* if client_random is initialized, reuse it, we are 816 * required to use same upon reply to HelloVerify */ 817 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) 818 ; 819 if (i==sizeof(s->s3->client_random)) 820 ssl_fill_hello_random(s, 0, p, 821 sizeof(s->s3->client_random)); 822 823 /* Do the message type and length last */ 824 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 825 826 *(p++)=s->version>>8; 827 *(p++)=s->version&0xff; 828 s->client_version=s->version; 829 830 /* Random stuff */ 831 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 832 p+=SSL3_RANDOM_SIZE; 833 834 /* Session ID */ 835 if (s->new_session) 836 i=0; 837 else 838 i=s->session->session_id_length; 839 *(p++)=i; 840 if (i != 0) 841 { 842 if (i > sizeof s->session->session_id) 843 { 844 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 845 goto err; 846 } 847 memcpy(p,s->session->session_id,i); 848 p+=i; 849 } 850 851 /* cookie stuff */ 852 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 853 { 854 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 855 goto err; 856 } 857 *(p++) = s->d1->cookie_len; 858 memcpy(p, s->d1->cookie, s->d1->cookie_len); 859 p += s->d1->cookie_len; 860 861 /* Ciphers supported */ 862 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0); 863 if (i == 0) 864 { 865 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 866 goto err; 867 } 868 s2n(i,p); 869 p+=i; 870 871 /* COMPRESSION */ 872 if (s->ctx->comp_methods == NULL) 873 j=0; 874 else 875 j=sk_SSL_COMP_num(s->ctx->comp_methods); 876 *(p++)=1+j; 877 for (i=0; i<j; i++) 878 { 879 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 880 *(p++)=comp->id; 881 } 882 *(p++)=0; /* Add the NULL method */ 883 884 #ifndef OPENSSL_NO_TLSEXT 885 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 886 { 887 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 888 goto err; 889 } 890 #endif 891 892 l=(p-d); 893 d=buf; 894 895 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l); 896 897 s->state=SSL3_ST_CW_CLNT_HELLO_B; 898 /* number of bytes to write */ 899 s->init_num=p-buf; 900 s->init_off=0; 901 902 /* buffer the message to handle re-xmits */ 903 dtls1_buffer_message(s, 0); 904 } 905 906 /* SSL3_ST_CW_CLNT_HELLO_B */ 907 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 908 err: 909 return(-1); 910 } 911 912 static int dtls1_get_hello_verify(SSL *s) 913 { 914 int n, al, ok = 0; 915 unsigned char *data; 916 unsigned int cookie_len; 917 918 n=s->method->ssl_get_message(s, 919 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 920 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, 921 -1, 922 s->max_cert_list, 923 &ok); 924 925 if (!ok) return((int)n); 926 927 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) 928 { 929 s->d1->send_cookie = 0; 930 s->s3->tmp.reuse_message=1; 931 return(1); 932 } 933 934 data = (unsigned char *)s->init_msg; 935 936 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff))) 937 { 938 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION); 939 s->version=(s->version&0xff00)|data[1]; 940 al = SSL_AD_PROTOCOL_VERSION; 941 goto f_err; 942 } 943 data+=2; 944 945 cookie_len = *(data++); 946 if ( cookie_len > sizeof(s->d1->cookie)) 947 { 948 al=SSL_AD_ILLEGAL_PARAMETER; 949 goto f_err; 950 } 951 952 memcpy(s->d1->cookie, data, cookie_len); 953 s->d1->cookie_len = cookie_len; 954 955 s->d1->send_cookie = 1; 956 return 1; 957 958 f_err: 959 ssl3_send_alert(s, SSL3_AL_FATAL, al); 960 return -1; 961 } 962 963 int dtls1_send_client_key_exchange(SSL *s) 964 { 965 unsigned char *p,*d; 966 int n; 967 unsigned long alg_k; 968 #ifndef OPENSSL_NO_RSA 969 unsigned char *q; 970 EVP_PKEY *pkey=NULL; 971 #endif 972 #ifndef OPENSSL_NO_KRB5 973 KSSL_ERR kssl_err; 974 #endif /* OPENSSL_NO_KRB5 */ 975 #ifndef OPENSSL_NO_ECDH 976 EC_KEY *clnt_ecdh = NULL; 977 const EC_POINT *srvr_ecpoint = NULL; 978 EVP_PKEY *srvr_pub_pkey = NULL; 979 unsigned char *encodedPoint = NULL; 980 int encoded_pt_len = 0; 981 BN_CTX * bn_ctx = NULL; 982 #endif 983 984 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 985 { 986 d=(unsigned char *)s->init_buf->data; 987 p= &(d[DTLS1_HM_HEADER_LENGTH]); 988 989 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 990 991 /* Fool emacs indentation */ 992 if (0) {} 993 #ifndef OPENSSL_NO_RSA 994 else if (alg_k & SSL_kRSA) 995 { 996 RSA *rsa; 997 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 998 999 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1000 rsa=s->session->sess_cert->peer_rsa_tmp; 1001 else 1002 { 1003 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1004 if ((pkey == NULL) || 1005 (pkey->type != EVP_PKEY_RSA) || 1006 (pkey->pkey.rsa == NULL)) 1007 { 1008 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1009 goto err; 1010 } 1011 rsa=pkey->pkey.rsa; 1012 EVP_PKEY_free(pkey); 1013 } 1014 1015 tmp_buf[0]=s->client_version>>8; 1016 tmp_buf[1]=s->client_version&0xff; 1017 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 1018 goto err; 1019 1020 s->session->master_key_length=sizeof tmp_buf; 1021 1022 q=p; 1023 /* Fix buf for TLS and [incidentally] DTLS */ 1024 if (s->version > SSL3_VERSION) 1025 p+=2; 1026 n=RSA_public_encrypt(sizeof tmp_buf, 1027 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 1028 #ifdef PKCS1_CHECK 1029 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++; 1030 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70; 1031 #endif 1032 if (n <= 0) 1033 { 1034 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT); 1035 goto err; 1036 } 1037 1038 /* Fix buf for TLS and [incidentally] DTLS */ 1039 if (s->version > SSL3_VERSION) 1040 { 1041 s2n(n,q); 1042 n+=2; 1043 } 1044 1045 s->session->master_key_length= 1046 s->method->ssl3_enc->generate_master_secret(s, 1047 s->session->master_key, 1048 tmp_buf,sizeof tmp_buf); 1049 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 1050 } 1051 #endif 1052 #ifndef OPENSSL_NO_KRB5 1053 else if (alg_k & SSL_kKRB5) 1054 { 1055 krb5_error_code krb5rc; 1056 KSSL_CTX *kssl_ctx = s->kssl_ctx; 1057 /* krb5_data krb5_ap_req; */ 1058 krb5_data *enc_ticket; 1059 krb5_data authenticator, *authp = NULL; 1060 EVP_CIPHER_CTX ciph_ctx; 1061 const EVP_CIPHER *enc = NULL; 1062 unsigned char iv[EVP_MAX_IV_LENGTH]; 1063 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1064 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH 1065 + EVP_MAX_IV_LENGTH]; 1066 int padl, outl = sizeof(epms); 1067 1068 EVP_CIPHER_CTX_init(&ciph_ctx); 1069 1070 #ifdef KSSL_DEBUG 1071 printf("ssl3_send_client_key_exchange(%lx & %lx)\n", 1072 alg_k, SSL_kKRB5); 1073 #endif /* KSSL_DEBUG */ 1074 1075 authp = NULL; 1076 #ifdef KRB5SENDAUTH 1077 if (KRB5SENDAUTH) authp = &authenticator; 1078 #endif /* KRB5SENDAUTH */ 1079 1080 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, 1081 &kssl_err); 1082 enc = kssl_map_enc(kssl_ctx->enctype); 1083 if (enc == NULL) 1084 goto err; 1085 #ifdef KSSL_DEBUG 1086 { 1087 printf("kssl_cget_tkt rtn %d\n", krb5rc); 1088 if (krb5rc && kssl_err.text) 1089 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text); 1090 } 1091 #endif /* KSSL_DEBUG */ 1092 1093 if (krb5rc) 1094 { 1095 ssl3_send_alert(s,SSL3_AL_FATAL, 1096 SSL_AD_HANDSHAKE_FAILURE); 1097 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1098 kssl_err.reason); 1099 goto err; 1100 } 1101 1102 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ 1103 ** in place of RFC 2712 KerberosWrapper, as in: 1104 ** 1105 ** Send ticket (copy to *p, set n = length) 1106 ** n = krb5_ap_req.length; 1107 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 1108 ** if (krb5_ap_req.data) 1109 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 1110 ** 1111 ** Now using real RFC 2712 KerberosWrapper 1112 ** (Thanks to Simon Wilkinson <sxw (at) sxw.org.uk>) 1113 ** Note: 2712 "opaque" types are here replaced 1114 ** with a 2-byte length followed by the value. 1115 ** Example: 1116 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 1117 ** Where "xx xx" = length bytes. Shown here with 1118 ** optional authenticator omitted. 1119 */ 1120 1121 /* KerberosWrapper.Ticket */ 1122 s2n(enc_ticket->length,p); 1123 memcpy(p, enc_ticket->data, enc_ticket->length); 1124 p+= enc_ticket->length; 1125 n = enc_ticket->length + 2; 1126 1127 /* KerberosWrapper.Authenticator */ 1128 if (authp && authp->length) 1129 { 1130 s2n(authp->length,p); 1131 memcpy(p, authp->data, authp->length); 1132 p+= authp->length; 1133 n+= authp->length + 2; 1134 1135 free(authp->data); 1136 authp->data = NULL; 1137 authp->length = 0; 1138 } 1139 else 1140 { 1141 s2n(0,p);/* null authenticator length */ 1142 n+=2; 1143 } 1144 1145 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0) 1146 goto err; 1147 1148 /* 20010420 VRS. Tried it this way; failed. 1149 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 1150 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 1151 ** kssl_ctx->length); 1152 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 1153 */ 1154 1155 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 1156 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL, 1157 kssl_ctx->key,iv); 1158 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf, 1159 sizeof tmp_buf); 1160 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl); 1161 outl += padl; 1162 if (outl > (int)sizeof epms) 1163 { 1164 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1165 goto err; 1166 } 1167 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 1168 1169 /* KerberosWrapper.EncryptedPreMasterSecret */ 1170 s2n(outl,p); 1171 memcpy(p, epms, outl); 1172 p+=outl; 1173 n+=outl + 2; 1174 1175 s->session->master_key_length= 1176 s->method->ssl3_enc->generate_master_secret(s, 1177 s->session->master_key, 1178 tmp_buf, sizeof tmp_buf); 1179 1180 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 1181 OPENSSL_cleanse(epms, outl); 1182 } 1183 #endif 1184 #ifndef OPENSSL_NO_DH 1185 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 1186 { 1187 DH *dh_srvr,*dh_clnt; 1188 1189 if (s->session->sess_cert->peer_dh_tmp != NULL) 1190 dh_srvr=s->session->sess_cert->peer_dh_tmp; 1191 else 1192 { 1193 /* we get them from the cert */ 1194 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1195 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1196 goto err; 1197 } 1198 1199 /* generate a new random key */ 1200 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 1201 { 1202 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1203 goto err; 1204 } 1205 if (!DH_generate_key(dh_clnt)) 1206 { 1207 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1208 goto err; 1209 } 1210 1211 /* use the 'p' output buffer for the DH key, but 1212 * make sure to clear it out afterwards */ 1213 1214 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 1215 1216 if (n <= 0) 1217 { 1218 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB); 1219 goto err; 1220 } 1221 1222 /* generate master key from the result */ 1223 s->session->master_key_length= 1224 s->method->ssl3_enc->generate_master_secret(s, 1225 s->session->master_key,p,n); 1226 /* clean up */ 1227 memset(p,0,n); 1228 1229 /* send off the data */ 1230 n=BN_num_bytes(dh_clnt->pub_key); 1231 s2n(n,p); 1232 BN_bn2bin(dh_clnt->pub_key,p); 1233 n+=2; 1234 1235 DH_free(dh_clnt); 1236 1237 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 1238 } 1239 #endif 1240 #ifndef OPENSSL_NO_ECDH 1241 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) 1242 { 1243 const EC_GROUP *srvr_group = NULL; 1244 EC_KEY *tkey; 1245 int ecdh_clnt_cert = 0; 1246 int field_size = 0; 1247 1248 /* Did we send out the client's 1249 * ECDH share for use in premaster 1250 * computation as part of client certificate? 1251 * If so, set ecdh_clnt_cert to 1. 1252 */ 1253 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 1254 { 1255 /* XXX: For now, we do not support client 1256 * authentication using ECDH certificates. 1257 * To add such support, one needs to add 1258 * code that checks for appropriate 1259 * conditions and sets ecdh_clnt_cert to 1. 1260 * For example, the cert have an ECC 1261 * key on the same curve as the server's 1262 * and the key should be authorized for 1263 * key agreement. 1264 * 1265 * One also needs to add code in ssl3_connect 1266 * to skip sending the certificate verify 1267 * message. 1268 * 1269 * if ((s->cert->key->privatekey != NULL) && 1270 * (s->cert->key->privatekey->type == 1271 * EVP_PKEY_EC) && ...) 1272 * ecdh_clnt_cert = 1; 1273 */ 1274 } 1275 1276 if (s->session->sess_cert->peer_ecdh_tmp != NULL) 1277 { 1278 tkey = s->session->sess_cert->peer_ecdh_tmp; 1279 } 1280 else 1281 { 1282 /* Get the Server Public Key from Cert */ 1283 srvr_pub_pkey = X509_get_pubkey(s->session-> \ 1284 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1285 if ((srvr_pub_pkey == NULL) || 1286 (srvr_pub_pkey->type != EVP_PKEY_EC) || 1287 (srvr_pub_pkey->pkey.ec == NULL)) 1288 { 1289 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1290 ERR_R_INTERNAL_ERROR); 1291 goto err; 1292 } 1293 1294 tkey = srvr_pub_pkey->pkey.ec; 1295 } 1296 1297 srvr_group = EC_KEY_get0_group(tkey); 1298 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 1299 1300 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 1301 { 1302 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1303 ERR_R_INTERNAL_ERROR); 1304 goto err; 1305 } 1306 1307 if ((clnt_ecdh=EC_KEY_new()) == NULL) 1308 { 1309 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1310 goto err; 1311 } 1312 1313 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 1314 { 1315 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1316 goto err; 1317 } 1318 if (ecdh_clnt_cert) 1319 { 1320 /* Reuse key info from our certificate 1321 * We only need our private key to perform 1322 * the ECDH computation. 1323 */ 1324 const BIGNUM *priv_key; 1325 tkey = s->cert->key->privatekey->pkey.ec; 1326 priv_key = EC_KEY_get0_private_key(tkey); 1327 if (priv_key == NULL) 1328 { 1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1330 goto err; 1331 } 1332 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) 1333 { 1334 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB); 1335 goto err; 1336 } 1337 } 1338 else 1339 { 1340 /* Generate a new ECDH key pair */ 1341 if (!(EC_KEY_generate_key(clnt_ecdh))) 1342 { 1343 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1344 goto err; 1345 } 1346 } 1347 1348 /* use the 'p' output buffer for the ECDH key, but 1349 * make sure to clear it out afterwards 1350 */ 1351 1352 field_size = EC_GROUP_get_degree(srvr_group); 1353 if (field_size <= 0) 1354 { 1355 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1356 ERR_R_ECDH_LIB); 1357 goto err; 1358 } 1359 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 1360 if (n <= 0) 1361 { 1362 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1363 ERR_R_ECDH_LIB); 1364 goto err; 1365 } 1366 1367 /* generate master key from the result */ 1368 s->session->master_key_length = s->method->ssl3_enc \ 1369 -> generate_master_secret(s, 1370 s->session->master_key, 1371 p, n); 1372 1373 memset(p, 0, n); /* clean up */ 1374 1375 if (ecdh_clnt_cert) 1376 { 1377 /* Send empty client key exch message */ 1378 n = 0; 1379 } 1380 else 1381 { 1382 /* First check the size of encoding and 1383 * allocate memory accordingly. 1384 */ 1385 encoded_pt_len = 1386 EC_POINT_point2oct(srvr_group, 1387 EC_KEY_get0_public_key(clnt_ecdh), 1388 POINT_CONVERSION_UNCOMPRESSED, 1389 NULL, 0, NULL); 1390 1391 encodedPoint = (unsigned char *) 1392 OPENSSL_malloc(encoded_pt_len * 1393 sizeof(unsigned char)); 1394 bn_ctx = BN_CTX_new(); 1395 if ((encodedPoint == NULL) || 1396 (bn_ctx == NULL)) 1397 { 1398 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1399 goto err; 1400 } 1401 1402 /* Encode the public key */ 1403 n = EC_POINT_point2oct(srvr_group, 1404 EC_KEY_get0_public_key(clnt_ecdh), 1405 POINT_CONVERSION_UNCOMPRESSED, 1406 encodedPoint, encoded_pt_len, bn_ctx); 1407 1408 *p = n; /* length of encoded point */ 1409 /* Encoded point will be copied here */ 1410 p += 1; 1411 /* copy the point */ 1412 memcpy((unsigned char *)p, encodedPoint, n); 1413 /* increment n to account for length field */ 1414 n += 1; 1415 } 1416 1417 /* Free allocated memory */ 1418 BN_CTX_free(bn_ctx); 1419 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1420 if (clnt_ecdh != NULL) 1421 EC_KEY_free(clnt_ecdh); 1422 EVP_PKEY_free(srvr_pub_pkey); 1423 } 1424 #endif /* !OPENSSL_NO_ECDH */ 1425 1426 #ifndef OPENSSL_NO_PSK 1427 else if (alg_k & SSL_kPSK) 1428 { 1429 char identity[PSK_MAX_IDENTITY_LEN]; 1430 unsigned char *t = NULL; 1431 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4]; 1432 unsigned int pre_ms_len = 0, psk_len = 0; 1433 int psk_err = 1; 1434 1435 n = 0; 1436 if (s->psk_client_callback == NULL) 1437 { 1438 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1439 SSL_R_PSK_NO_CLIENT_CB); 1440 goto err; 1441 } 1442 1443 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 1444 identity, PSK_MAX_IDENTITY_LEN, 1445 psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1446 if (psk_len > PSK_MAX_PSK_LEN) 1447 { 1448 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1449 ERR_R_INTERNAL_ERROR); 1450 goto psk_err; 1451 } 1452 else if (psk_len == 0) 1453 { 1454 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1455 SSL_R_PSK_IDENTITY_NOT_FOUND); 1456 goto psk_err; 1457 } 1458 1459 /* create PSK pre_master_secret */ 1460 pre_ms_len = 2+psk_len+2+psk_len; 1461 t = psk_or_pre_ms; 1462 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len); 1463 s2n(psk_len, t); 1464 memset(t, 0, psk_len); 1465 t+=psk_len; 1466 s2n(psk_len, t); 1467 1468 if (s->session->psk_identity != NULL) 1469 OPENSSL_free(s->session->psk_identity); 1470 s->session->psk_identity = BUF_strdup(identity); 1471 if (s->session->psk_identity == NULL) 1472 { 1473 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 1474 ERR_R_MALLOC_FAILURE); 1475 goto psk_err; 1476 } 1477 1478 s->session->master_key_length = 1479 s->method->ssl3_enc->generate_master_secret(s, 1480 s->session->master_key, 1481 psk_or_pre_ms, pre_ms_len); 1482 n = strlen(identity); 1483 s2n(n, p); 1484 memcpy(p, identity, n); 1485 n+=2; 1486 psk_err = 0; 1487 psk_err: 1488 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1489 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 1490 if (psk_err != 0) 1491 { 1492 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1493 goto err; 1494 } 1495 } 1496 #endif 1497 else 1498 { 1499 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 1500 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR); 1501 goto err; 1502 } 1503 1504 d = dtls1_set_message_header(s, d, 1505 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n); 1506 /* 1507 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE; 1508 l2n3(n,d); 1509 l2n(s->d1->handshake_write_seq,d); 1510 s->d1->handshake_write_seq++; 1511 */ 1512 1513 s->state=SSL3_ST_CW_KEY_EXCH_B; 1514 /* number of bytes to write */ 1515 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1516 s->init_off=0; 1517 1518 /* buffer the message to handle re-xmits */ 1519 dtls1_buffer_message(s, 0); 1520 } 1521 1522 /* SSL3_ST_CW_KEY_EXCH_B */ 1523 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1524 err: 1525 #ifndef OPENSSL_NO_ECDH 1526 BN_CTX_free(bn_ctx); 1527 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1528 if (clnt_ecdh != NULL) 1529 EC_KEY_free(clnt_ecdh); 1530 EVP_PKEY_free(srvr_pub_pkey); 1531 #endif 1532 return(-1); 1533 } 1534 1535 int dtls1_send_client_verify(SSL *s) 1536 { 1537 unsigned char *p,*d; 1538 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1539 EVP_PKEY *pkey; 1540 #ifndef OPENSSL_NO_RSA 1541 unsigned u=0; 1542 #endif 1543 unsigned long n; 1544 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA) 1545 int j; 1546 #endif 1547 1548 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 1549 { 1550 d=(unsigned char *)s->init_buf->data; 1551 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1552 pkey=s->cert->key->privatekey; 1553 1554 s->method->ssl3_enc->cert_verify_mac(s, 1555 NID_sha1, 1556 &(data[MD5_DIGEST_LENGTH])); 1557 1558 #ifndef OPENSSL_NO_RSA 1559 if (pkey->type == EVP_PKEY_RSA) 1560 { 1561 s->method->ssl3_enc->cert_verify_mac(s, 1562 NID_md5, 1563 &(data[0])); 1564 if (RSA_sign(NID_md5_sha1, data, 1565 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, 1566 &(p[2]), &u, pkey->pkey.rsa) <= 0 ) 1567 { 1568 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB); 1569 goto err; 1570 } 1571 s2n(u,p); 1572 n=u+2; 1573 } 1574 else 1575 #endif 1576 #ifndef OPENSSL_NO_DSA 1577 if (pkey->type == EVP_PKEY_DSA) 1578 { 1579 if (!DSA_sign(pkey->save_type, 1580 &(data[MD5_DIGEST_LENGTH]), 1581 SHA_DIGEST_LENGTH,&(p[2]), 1582 (unsigned int *)&j,pkey->pkey.dsa)) 1583 { 1584 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB); 1585 goto err; 1586 } 1587 s2n(j,p); 1588 n=j+2; 1589 } 1590 else 1591 #endif 1592 #ifndef OPENSSL_NO_ECDSA 1593 if (pkey->type == EVP_PKEY_EC) 1594 { 1595 if (!ECDSA_sign(pkey->save_type, 1596 &(data[MD5_DIGEST_LENGTH]), 1597 SHA_DIGEST_LENGTH,&(p[2]), 1598 (unsigned int *)&j,pkey->pkey.ec)) 1599 { 1600 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, 1601 ERR_R_ECDSA_LIB); 1602 goto err; 1603 } 1604 s2n(j,p); 1605 n=j+2; 1606 } 1607 else 1608 #endif 1609 { 1610 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR); 1611 goto err; 1612 } 1613 1614 d = dtls1_set_message_header(s, d, 1615 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ; 1616 1617 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH; 1618 s->init_off=0; 1619 1620 /* buffer the message to handle re-xmits */ 1621 dtls1_buffer_message(s, 0); 1622 1623 s->state = SSL3_ST_CW_CERT_VRFY_B; 1624 } 1625 1626 /* s->state = SSL3_ST_CW_CERT_VRFY_B */ 1627 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1628 err: 1629 return(-1); 1630 } 1631 1632 int dtls1_send_client_certificate(SSL *s) 1633 { 1634 X509 *x509=NULL; 1635 EVP_PKEY *pkey=NULL; 1636 int i; 1637 unsigned long l; 1638 1639 if (s->state == SSL3_ST_CW_CERT_A) 1640 { 1641 if ((s->cert == NULL) || 1642 (s->cert->key->x509 == NULL) || 1643 (s->cert->key->privatekey == NULL)) 1644 s->state=SSL3_ST_CW_CERT_B; 1645 else 1646 s->state=SSL3_ST_CW_CERT_C; 1647 } 1648 1649 /* We need to get a client cert */ 1650 if (s->state == SSL3_ST_CW_CERT_B) 1651 { 1652 /* If we get an error, we need to 1653 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 1654 * We then get retied later */ 1655 i=0; 1656 i = ssl_do_client_cert_cb(s, &x509, &pkey); 1657 if (i < 0) 1658 { 1659 s->rwstate=SSL_X509_LOOKUP; 1660 return(-1); 1661 } 1662 s->rwstate=SSL_NOTHING; 1663 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 1664 { 1665 s->state=SSL3_ST_CW_CERT_B; 1666 if ( !SSL_use_certificate(s,x509) || 1667 !SSL_use_PrivateKey(s,pkey)) 1668 i=0; 1669 } 1670 else if (i == 1) 1671 { 1672 i=0; 1673 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 1674 } 1675 1676 if (x509 != NULL) X509_free(x509); 1677 if (pkey != NULL) EVP_PKEY_free(pkey); 1678 if (i == 0) 1679 { 1680 if (s->version == SSL3_VERSION) 1681 { 1682 s->s3->tmp.cert_req=0; 1683 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 1684 return(1); 1685 } 1686 else 1687 { 1688 s->s3->tmp.cert_req=2; 1689 } 1690 } 1691 1692 /* Ok, we have a cert */ 1693 s->state=SSL3_ST_CW_CERT_C; 1694 } 1695 1696 if (s->state == SSL3_ST_CW_CERT_C) 1697 { 1698 s->state=SSL3_ST_CW_CERT_D; 1699 l=dtls1_output_cert_chain(s, 1700 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509); 1701 s->init_num=(int)l; 1702 s->init_off=0; 1703 1704 /* set header called by dtls1_output_cert_chain() */ 1705 1706 /* buffer the message to handle re-xmits */ 1707 dtls1_buffer_message(s, 0); 1708 } 1709 /* SSL3_ST_CW_CERT_D */ 1710 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1711 } 1712 1713 1714
