1 /* ssl/s3_clnt.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core (at) openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <stdio.h> 152 153 #include <openssl/buf.h> 154 #include <openssl/bytestring.h> 155 #include <openssl/rand.h> 156 #include <openssl/obj.h> 157 #include <openssl/evp.h> 158 #include <openssl/mem.h> 159 #include <openssl/md5.h> 160 #include <openssl/dh.h> 161 #include <openssl/bn.h> 162 #include <openssl/engine.h> 163 #include <openssl/x509.h> 164 165 #include "ssl_locl.h" 166 #include "../crypto/dh/internal.h" 167 168 static const SSL_METHOD *ssl3_get_client_method(int ver); 169 170 static const SSL_METHOD *ssl3_get_client_method(int ver) 171 { 172 if (ver == SSL3_VERSION) 173 return(SSLv3_client_method()); 174 else 175 return(NULL); 176 } 177 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method, 179 ssl_undefined_function, 180 ssl3_connect, 181 ssl3_get_client_method) 182 183 int ssl3_connect(SSL *s) 184 { 185 BUF_MEM *buf=NULL; 186 void (*cb)(const SSL *ssl,int type,int val)=NULL; 187 int ret= -1; 188 int new_state,state,skip=0; 189 190 ERR_clear_error(); 191 ERR_clear_system_error(); 192 193 if (s->info_callback != NULL) 194 cb=s->info_callback; 195 else if (s->ctx->info_callback != NULL) 196 cb=s->ctx->info_callback; 197 198 s->in_handshake++; 199 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 200 201 for (;;) 202 { 203 state=s->state; 204 205 switch(s->state) 206 { 207 case SSL_ST_RENEGOTIATE: 208 s->renegotiate=1; 209 s->state=SSL_ST_CONNECT; 210 s->ctx->stats.sess_connect_renegotiate++; 211 /* break */ 212 case SSL_ST_BEFORE: 213 case SSL_ST_CONNECT: 214 case SSL_ST_BEFORE|SSL_ST_CONNECT: 215 case SSL_ST_OK|SSL_ST_CONNECT: 216 217 s->server=0; 218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 219 220 if ((s->version & 0xff00 ) != 0x0300) 221 { 222 OPENSSL_PUT_ERROR(SSL, ssl3_connect, ERR_R_INTERNAL_ERROR); 223 ret = -1; 224 goto end; 225 } 226 227 /* s->version=SSL3_VERSION; */ 228 s->type=SSL_ST_CONNECT; 229 230 if (s->init_buf == NULL) 231 { 232 if ((buf=BUF_MEM_new()) == NULL) 233 { 234 ret= -1; 235 goto end; 236 } 237 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 238 { 239 ret= -1; 240 goto end; 241 } 242 s->init_buf=buf; 243 buf=NULL; 244 } 245 246 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 247 248 /* setup buffing BIO */ 249 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; } 250 251 /* don't push the buffering BIO quite yet */ 252 253 ssl3_init_finished_mac(s); 254 255 s->state=SSL3_ST_CW_CLNT_HELLO_A; 256 s->ctx->stats.sess_connect++; 257 s->init_num=0; 258 break; 259 260 case SSL3_ST_CW_CLNT_HELLO_A: 261 case SSL3_ST_CW_CLNT_HELLO_B: 262 263 s->shutdown=0; 264 ret=ssl3_send_client_hello(s); 265 if (ret <= 0) goto end; 266 s->state=SSL3_ST_CR_SRVR_HELLO_A; 267 s->init_num=0; 268 269 /* turn on buffering for the next lot of output */ 270 if (s->bbio != s->wbio) 271 s->wbio=BIO_push(s->bbio,s->wbio); 272 273 break; 274 275 case SSL3_ST_CR_SRVR_HELLO_A: 276 case SSL3_ST_CR_SRVR_HELLO_B: 277 ret=ssl3_get_server_hello(s); 278 if (ret <= 0) goto end; 279 280 if (s->hit) 281 { 282 s->state=SSL3_ST_CR_CHANGE; 283 if (s->tlsext_ticket_expected) 284 { 285 /* receive renewed session ticket */ 286 s->state=SSL3_ST_CR_SESSION_TICKET_A; 287 } 288 } 289 else 290 { 291 s->state=SSL3_ST_CR_CERT_A; 292 } 293 s->init_num=0; 294 break; 295 296 case SSL3_ST_CR_CERT_A: 297 case SSL3_ST_CR_CERT_B: 298 if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) 299 { 300 ret=ssl3_get_server_certificate(s); 301 if (ret <= 0) goto end; 302 if (s->s3->tmp.certificate_status_expected) 303 s->state=SSL3_ST_CR_CERT_STATUS_A; 304 else 305 s->state=SSL3_ST_CR_KEY_EXCH_A; 306 } 307 else 308 { 309 skip = 1; 310 s->state=SSL3_ST_CR_KEY_EXCH_A; 311 } 312 s->init_num=0; 313 break; 314 315 case SSL3_ST_CR_KEY_EXCH_A: 316 case SSL3_ST_CR_KEY_EXCH_B: 317 ret=ssl3_get_server_key_exchange(s); 318 if (ret <= 0) goto end; 319 s->state=SSL3_ST_CR_CERT_REQ_A; 320 s->init_num=0; 321 322 /* at this point we check that we have the 323 * required stuff from the server */ 324 if (!ssl3_check_cert_and_algorithm(s)) 325 { 326 ret= -1; 327 goto end; 328 } 329 break; 330 331 case SSL3_ST_CR_CERT_REQ_A: 332 case SSL3_ST_CR_CERT_REQ_B: 333 ret=ssl3_get_certificate_request(s); 334 if (ret <= 0) goto end; 335 s->state=SSL3_ST_CR_SRVR_DONE_A; 336 s->init_num=0; 337 break; 338 339 case SSL3_ST_CR_SRVR_DONE_A: 340 case SSL3_ST_CR_SRVR_DONE_B: 341 ret=ssl3_get_server_done(s); 342 if (ret <= 0) goto end; 343 if (s->s3->tmp.cert_req) 344 s->state=SSL3_ST_CW_CERT_A; 345 else 346 s->state=SSL3_ST_CW_KEY_EXCH_A; 347 s->init_num=0; 348 349 break; 350 351 case SSL3_ST_CW_CERT_A: 352 case SSL3_ST_CW_CERT_B: 353 case SSL3_ST_CW_CERT_C: 354 case SSL3_ST_CW_CERT_D: 355 ret=ssl3_send_client_certificate(s); 356 if (ret <= 0) goto end; 357 s->state=SSL3_ST_CW_KEY_EXCH_A; 358 s->init_num=0; 359 break; 360 361 case SSL3_ST_CW_KEY_EXCH_A: 362 case SSL3_ST_CW_KEY_EXCH_B: 363 ret=ssl3_send_client_key_exchange(s); 364 if (ret <= 0) goto end; 365 /* For TLS, cert_req is set to 2, so a cert chain 366 * of nothing is sent, but no verify packet is sent */ 367 if (s->s3->tmp.cert_req == 1) 368 { 369 s->state=SSL3_ST_CW_CERT_VRFY_A; 370 } 371 else 372 { 373 s->state=SSL3_ST_CW_CHANGE_A; 374 s->s3->change_cipher_spec=0; 375 } 376 377 s->init_num=0; 378 break; 379 380 case SSL3_ST_CW_CERT_VRFY_A: 381 case SSL3_ST_CW_CERT_VRFY_B: 382 ret=ssl3_send_cert_verify(s); 383 if (ret <= 0) goto end; 384 s->state=SSL3_ST_CW_CHANGE_A; 385 s->init_num=0; 386 s->s3->change_cipher_spec=0; 387 break; 388 389 case SSL3_ST_CW_CHANGE_A: 390 case SSL3_ST_CW_CHANGE_B: 391 ret=ssl3_send_change_cipher_spec(s, 392 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B); 393 if (ret <= 0) goto end; 394 395 s->state=SSL3_ST_CW_FINISHED_A; 396 if (s->s3->tlsext_channel_id_valid) 397 s->state=SSL3_ST_CW_CHANNEL_ID_A; 398 if (s->s3->next_proto_neg_seen) 399 s->state=SSL3_ST_CW_NEXT_PROTO_A; 400 s->init_num=0; 401 402 s->session->cipher=s->s3->tmp.new_cipher; 403 if (!s->method->ssl3_enc->setup_key_block(s)) 404 { 405 ret= -1; 406 goto end; 407 } 408 409 if (!s->method->ssl3_enc->change_cipher_state(s, 410 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 411 { 412 ret= -1; 413 goto end; 414 } 415 416 break; 417 418 case SSL3_ST_CW_NEXT_PROTO_A: 419 case SSL3_ST_CW_NEXT_PROTO_B: 420 ret=ssl3_send_next_proto(s); 421 if (ret <= 0) goto end; 422 if (s->s3->tlsext_channel_id_valid) 423 s->state=SSL3_ST_CW_CHANNEL_ID_A; 424 else 425 s->state=SSL3_ST_CW_FINISHED_A; 426 break; 427 428 case SSL3_ST_CW_CHANNEL_ID_A: 429 case SSL3_ST_CW_CHANNEL_ID_B: 430 ret=ssl3_send_channel_id(s); 431 if (ret <= 0) goto end; 432 s->state=SSL3_ST_CW_FINISHED_A; 433 break; 434 435 case SSL3_ST_CW_FINISHED_A: 436 case SSL3_ST_CW_FINISHED_B: 437 ret=ssl3_send_finished(s, 438 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B, 439 s->method->ssl3_enc->client_finished_label, 440 s->method->ssl3_enc->client_finished_label_len); 441 if (ret <= 0) goto end; 442 s->state=SSL3_ST_CW_FLUSH; 443 444 /* clear flags */ 445 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER; 446 if (s->hit) 447 { 448 s->s3->tmp.next_state=SSL_ST_OK; 449 } 450 else 451 { 452 /* This is a non-resumption handshake. If it 453 * involves ChannelID, then record the 454 * handshake hashes at this point in the 455 * session so that any resumption of this 456 * session with ChannelID can sign those 457 * hashes. */ 458 if (s->s3->tlsext_channel_id_new) 459 { 460 ret = tls1_record_handshake_hashes_for_channel_id(s); 461 if (ret <= 0) 462 goto end; 463 } 464 if ((SSL_get_mode(s) & SSL_MODE_HANDSHAKE_CUTTHROUGH) 465 && ssl3_can_cutthrough(s) 466 && s->s3->previous_server_finished_len == 0 /* no cutthrough on renegotiation (would complicate the state machine) */ 467 ) 468 { 469 s->s3->tmp.next_state=SSL3_ST_CUTTHROUGH_COMPLETE; 470 } 471 else 472 { 473 /* Allow NewSessionTicket if ticket expected */ 474 if (s->tlsext_ticket_expected) 475 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A; 476 else 477 s->s3->tmp.next_state=SSL3_ST_CR_CHANGE; 478 } 479 } 480 s->init_num=0; 481 break; 482 483 case SSL3_ST_CR_SESSION_TICKET_A: 484 case SSL3_ST_CR_SESSION_TICKET_B: 485 ret=ssl3_get_new_session_ticket(s); 486 if (ret <= 0) goto end; 487 s->state=SSL3_ST_CR_CHANGE; 488 s->init_num=0; 489 break; 490 491 case SSL3_ST_CR_CERT_STATUS_A: 492 case SSL3_ST_CR_CERT_STATUS_B: 493 ret=ssl3_get_cert_status(s); 494 if (ret <= 0) goto end; 495 s->state=SSL3_ST_CR_KEY_EXCH_A; 496 s->init_num=0; 497 break; 498 499 case SSL3_ST_CR_CHANGE: 500 /* At this point, the next message must be entirely 501 * behind a ChangeCipherSpec. */ 502 if (!ssl3_expect_change_cipher_spec(s)) 503 { 504 ret = -1; 505 goto end; 506 } 507 s->state = SSL3_ST_CR_FINISHED_A; 508 break; 509 510 case SSL3_ST_CR_FINISHED_A: 511 case SSL3_ST_CR_FINISHED_B: 512 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A, 513 SSL3_ST_CR_FINISHED_B); 514 if (ret <= 0) goto end; 515 516 if (s->hit) 517 s->state=SSL3_ST_CW_CHANGE_A; 518 else 519 s->state=SSL_ST_OK; 520 s->init_num=0; 521 break; 522 523 case SSL3_ST_CW_FLUSH: 524 s->rwstate=SSL_WRITING; 525 if (BIO_flush(s->wbio) <= 0) 526 { 527 ret= -1; 528 goto end; 529 } 530 s->rwstate=SSL_NOTHING; 531 s->state=s->s3->tmp.next_state; 532 break; 533 534 case SSL3_ST_CUTTHROUGH_COMPLETE: 535 /* Allow NewSessionTicket if ticket expected */ 536 if (s->tlsext_ticket_expected) 537 s->state=SSL3_ST_CR_SESSION_TICKET_A; 538 else 539 s->state=SSL3_ST_CR_CHANGE; 540 541 ssl_free_wbio_buffer(s); 542 ret = 1; 543 goto end; 544 /* break; */ 545 546 case SSL_ST_OK: 547 /* clean a few things up */ 548 ssl3_cleanup_key_block(s); 549 550 if (s->init_buf != NULL) 551 { 552 BUF_MEM_free(s->init_buf); 553 s->init_buf=NULL; 554 } 555 556 /* If we are not 'joining' the last two packets, 557 * remove the buffering now */ 558 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 559 ssl_free_wbio_buffer(s); 560 /* else do it later in ssl3_write */ 561 562 s->init_num=0; 563 s->renegotiate=0; 564 s->new_session=0; 565 566 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT); 567 if (s->hit) s->ctx->stats.sess_hit++; 568 569 ret=1; 570 /* s->server=0; */ 571 s->handshake_func=ssl3_connect; 572 s->ctx->stats.sess_connect_good++; 573 574 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 575 576 goto end; 577 /* break; */ 578 579 default: 580 OPENSSL_PUT_ERROR(SSL, ssl3_connect, SSL_R_UNKNOWN_STATE); 581 ret= -1; 582 goto end; 583 /* break; */ 584 } 585 586 /* did we do anything */ 587 if (!s->s3->tmp.reuse_message && !skip) 588 { 589 if (s->debug) 590 { 591 if ((ret=BIO_flush(s->wbio)) <= 0) 592 goto end; 593 } 594 595 if ((cb != NULL) && (s->state != state)) 596 { 597 new_state=s->state; 598 s->state=state; 599 cb(s,SSL_CB_CONNECT_LOOP,1); 600 s->state=new_state; 601 } 602 } 603 skip=0; 604 } 605 end: 606 s->in_handshake--; 607 if (buf != NULL) 608 BUF_MEM_free(buf); 609 if (cb != NULL) 610 cb(s,SSL_CB_CONNECT_EXIT,ret); 611 return(ret); 612 } 613 614 615 int ssl3_send_client_hello(SSL *s) 616 { 617 unsigned char *buf; 618 unsigned char *p,*d; 619 int i; 620 unsigned long l; 621 622 buf=(unsigned char *)s->init_buf->data; 623 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) 624 { 625 SSL_SESSION *sess = s->session; 626 if (sess == NULL || 627 sess->ssl_version != s->version || 628 !sess->session_id_length || 629 sess->not_resumable) 630 { 631 if (!ssl_get_new_session(s,0)) 632 goto err; 633 } 634 if (s->method->version == DTLS_ANY_VERSION) 635 { 636 /* Determine which DTLS version to use */ 637 int options = s->options; 638 /* If DTLS 1.2 disabled correct the version number */ 639 if (options & SSL_OP_NO_DTLSv1_2) 640 { 641 /* Disabling all versions is silly: return an 642 * error. 643 */ 644 if (options & SSL_OP_NO_DTLSv1) 645 { 646 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, SSL_R_WRONG_SSL_VERSION); 647 goto err; 648 } 649 /* Update method so we don't use any DTLS 1.2 650 * features. 651 */ 652 s->method = DTLSv1_client_method(); 653 s->version = DTLS1_VERSION; 654 } 655 else 656 { 657 /* We only support one version: update method */ 658 if (options & SSL_OP_NO_DTLSv1) 659 s->method = DTLSv1_2_client_method(); 660 s->version = DTLS1_2_VERSION; 661 } 662 s->client_version = s->version; 663 } 664 /* else use the pre-loaded session */ 665 666 p=s->s3->client_random; 667 668 /* If resending the ClientHello in DTLS after a 669 * HelloVerifyRequest, don't renegerate the client_random. The 670 * random must be reused. */ 671 if (!SSL_IS_DTLS(s) || !s->d1->send_cookie) 672 { 673 ssl_fill_hello_random(s, 0, p, 674 sizeof(s->s3->client_random)); 675 } 676 677 /* Do the message type and length last. 678 * Note: the final argument to ssl_add_clienthello_tlsext below 679 * depends on the size of this prefix. */ 680 d=p= ssl_handshake_start(s); 681 682 /* version indicates the negotiated version: for example from 683 * an SSLv2/v3 compatible client hello). The client_version 684 * field is the maximum version we permit and it is also 685 * used in RSA encrypted premaster secrets. Some servers can 686 * choke if we initially report a higher version then 687 * renegotiate to a lower one in the premaster secret. This 688 * didn't happen with TLS 1.0 as most servers supported it 689 * but it can with TLS 1.1 or later if the server only supports 690 * 1.0. 691 * 692 * Possible scenario with previous logic: 693 * 1. Client hello indicates TLS 1.2 694 * 2. Server hello says TLS 1.0 695 * 3. RSA encrypted premaster secret uses 1.2. 696 * 4. Handhaked proceeds using TLS 1.0. 697 * 5. Server sends hello request to renegotiate. 698 * 6. Client hello indicates TLS v1.0 as we now 699 * know that is maximum server supports. 700 * 7. Server chokes on RSA encrypted premaster secret 701 * containing version 1.0. 702 * 703 * For interoperability it should be OK to always use the 704 * maximum version we support in client hello and then rely 705 * on the checking of version to ensure the servers isn't 706 * being inconsistent: for example initially negotiating with 707 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 708 * client_version in client hello and not resetting it to 709 * the negotiated version. 710 */ 711 #if 0 712 *(p++)=s->version>>8; 713 *(p++)=s->version&0xff; 714 s->client_version=s->version; 715 #else 716 *(p++)=s->client_version>>8; 717 *(p++)=s->client_version&0xff; 718 #endif 719 720 /* Random stuff */ 721 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 722 p+=SSL3_RANDOM_SIZE; 723 724 /* Session ID */ 725 if (s->new_session) 726 i=0; 727 else 728 i=s->session->session_id_length; 729 *(p++)=i; 730 if (i != 0) 731 { 732 if (i > (int)sizeof(s->session->session_id)) 733 { 734 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, ERR_R_INTERNAL_ERROR); 735 goto err; 736 } 737 memcpy(p,s->session->session_id,i); 738 p+=i; 739 } 740 741 /* cookie stuff for DTLS */ 742 if (SSL_IS_DTLS(s)) 743 { 744 if ( s->d1->cookie_len > sizeof(s->d1->cookie)) 745 { 746 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, ERR_R_INTERNAL_ERROR); 747 goto err; 748 } 749 *(p++) = s->d1->cookie_len; 750 memcpy(p, s->d1->cookie, s->d1->cookie_len); 751 p += s->d1->cookie_len; 752 } 753 754 /* Ciphers supported */ 755 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &p[2]); 756 if (i == 0) 757 { 758 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, SSL_R_NO_CIPHERS_AVAILABLE); 759 goto err; 760 } 761 s2n(i,p); 762 p+=i; 763 764 /* COMPRESSION */ 765 *(p++)=1; 766 *(p++)=0; /* Add the NULL method */ 767 768 /* TLS extensions*/ 769 if (ssl_prepare_clienthello_tlsext(s) <= 0) 770 { 771 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, SSL_R_CLIENTHELLO_TLSEXT); 772 goto err; 773 } 774 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, p-buf)) == NULL) 775 { 776 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_hello, ERR_R_INTERNAL_ERROR); 777 goto err; 778 } 779 780 l= p-d; 781 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l); 782 s->state=SSL3_ST_CW_CLNT_HELLO_B; 783 } 784 785 /* SSL3_ST_CW_CLNT_HELLO_B */ 786 return ssl_do_write(s); 787 err: 788 return(-1); 789 } 790 791 int ssl3_get_server_hello(SSL *s) 792 { 793 STACK_OF(SSL_CIPHER) *sk; 794 const SSL_CIPHER *c; 795 CERT *ct = s->cert; 796 int al=SSL_AD_INTERNAL_ERROR,ok; 797 long n; 798 CBS server_hello, server_random, session_id; 799 uint16_t server_version, cipher_suite; 800 uint8_t compression_method; 801 unsigned long mask_ssl; 802 803 n=s->method->ssl_get_message(s, 804 SSL3_ST_CR_SRVR_HELLO_A, 805 SSL3_ST_CR_SRVR_HELLO_B, 806 SSL3_MT_SERVER_HELLO, 807 20000, /* ?? */ 808 SSL_GET_MESSAGE_HASH_MESSAGE, 809 &ok); 810 811 if (!ok) return((int)n); 812 813 CBS_init(&server_hello, s->init_msg, n); 814 815 if (!CBS_get_u16(&server_hello, &server_version) || 816 !CBS_get_bytes(&server_hello, &server_random, SSL3_RANDOM_SIZE) || 817 !CBS_get_u8_length_prefixed(&server_hello, &session_id) || 818 CBS_len(&session_id) > SSL3_SESSION_ID_SIZE || 819 !CBS_get_u16(&server_hello, &cipher_suite) || 820 !CBS_get_u8(&server_hello, &compression_method)) 821 { 822 al = SSL_AD_DECODE_ERROR; 823 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_DECODE_ERROR); 824 goto f_err; 825 } 826 827 if (s->method->version == DTLS_ANY_VERSION) 828 { 829 /* Work out correct protocol version to use */ 830 int options = s->options; 831 if (server_version == DTLS1_2_VERSION 832 && !(options & SSL_OP_NO_DTLSv1_2)) 833 s->method = DTLSv1_2_client_method(); 834 else if (server_version == DTLS1_VERSION 835 && !(options & SSL_OP_NO_DTLSv1)) 836 s->method = DTLSv1_client_method(); 837 else 838 { 839 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_WRONG_SSL_VERSION); 840 s->version = server_version; 841 al = SSL_AD_PROTOCOL_VERSION; 842 goto f_err; 843 } 844 s->version = s->client_version = s->method->version; 845 } 846 847 if (server_version != s->version) 848 { 849 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_WRONG_SSL_VERSION); 850 s->version = (s->version & 0xff00) | (server_version & 0xff); 851 al = SSL_AD_PROTOCOL_VERSION; 852 goto f_err; 853 } 854 855 /* Copy over the server random. */ 856 memcpy(s->s3->server_random, CBS_data(&server_random), SSL3_RANDOM_SIZE); 857 858 s->hit = 0; 859 860 /* check if we want to resume the session based on external pre-shared secret */ 861 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb) 862 { 863 const SSL_CIPHER *pref_cipher=NULL; 864 s->session->master_key_length=sizeof(s->session->master_key); 865 if (s->tls_session_secret_cb(s, s->session->master_key, 866 &s->session->master_key_length, 867 NULL, &pref_cipher, 868 s->tls_session_secret_cb_arg)) 869 { 870 s->session->cipher = pref_cipher ? 871 pref_cipher : 872 ssl3_get_cipher_by_value(cipher_suite); 873 s->hit = 1; 874 } 875 } 876 877 if (!s->hit && CBS_len(&session_id) != 0 && 878 CBS_mem_equal(&session_id, 879 s->session->session_id, s->session->session_id_length)) 880 { 881 if(s->sid_ctx_length != s->session->sid_ctx_length 882 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) 883 { 884 /* actually a client application bug */ 885 al = SSL_AD_ILLEGAL_PARAMETER; 886 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 887 goto f_err; 888 } 889 s->hit = 1; 890 } 891 892 /* a miss or crap from the other end */ 893 if (!s->hit) 894 { 895 /* If we were trying for session-id reuse, make a new 896 * SSL_SESSION so we don't stuff up other people */ 897 if (s->session->session_id_length > 0) 898 { 899 if (!ssl_get_new_session(s,0)) 900 { 901 goto f_err; 902 } 903 } 904 /* Note: session_id could be empty. */ 905 s->session->session_id_length = CBS_len(&session_id); 906 memcpy(s->session->session_id, CBS_data(&session_id), CBS_len(&session_id)); 907 } 908 909 c = ssl3_get_cipher_by_value(cipher_suite); 910 if (c == NULL) 911 { 912 /* unknown cipher */ 913 al = SSL_AD_ILLEGAL_PARAMETER; 914 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_UNKNOWN_CIPHER_RETURNED); 915 goto f_err; 916 } 917 /* ct->mask_ssl was computed from client capabilities. Now 918 * that the final version is known, compute a new mask_ssl. */ 919 if (!SSL_USE_TLS1_2_CIPHERS(s)) 920 mask_ssl = SSL_TLSV1_2; 921 else 922 mask_ssl = 0; 923 /* If it is a disabled cipher we didn't send it in client hello, 924 * so return an error. 925 */ 926 if (c->algorithm_ssl & mask_ssl || 927 c->algorithm_mkey & ct->mask_k || 928 c->algorithm_auth & ct->mask_a) 929 { 930 al=SSL_AD_ILLEGAL_PARAMETER; 931 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_WRONG_CIPHER_RETURNED); 932 goto f_err; 933 } 934 935 sk=ssl_get_ciphers_by_id(s); 936 if (!sk_SSL_CIPHER_find(sk, NULL, c)) 937 { 938 /* we did not say we would use this cipher */ 939 al=SSL_AD_ILLEGAL_PARAMETER; 940 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_WRONG_CIPHER_RETURNED); 941 goto f_err; 942 } 943 944 /* Depending on the session caching (internal/external), the cipher 945 and/or cipher_id values may not be set. Make sure that 946 cipher_id is set and use it for comparison. */ 947 if (s->session->cipher) 948 s->session->cipher_id = s->session->cipher->id; 949 if (s->hit && (s->session->cipher_id != c->id)) 950 { 951 al = SSL_AD_ILLEGAL_PARAMETER; 952 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 953 goto f_err; 954 } 955 s->s3->tmp.new_cipher=c; 956 /* Don't digest cached records if no sigalgs: we may need them for 957 * client authentication. 958 */ 959 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s)) 960 goto f_err; 961 962 /* Only the NULL compression algorithm is supported. */ 963 if (compression_method != 0) 964 { 965 al = SSL_AD_ILLEGAL_PARAMETER; 966 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 967 goto f_err; 968 } 969 970 /* TLS extensions */ 971 if (!ssl_parse_serverhello_tlsext(s, &server_hello)) 972 { 973 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_PARSE_TLSEXT); 974 goto err; 975 } 976 977 /* There should be nothing left over in the record. */ 978 if (CBS_len(&server_hello) != 0) 979 { 980 /* wrong packet length */ 981 al=SSL_AD_DECODE_ERROR; 982 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_hello, SSL_R_BAD_PACKET_LENGTH); 983 goto f_err; 984 } 985 986 return(1); 987 f_err: 988 ssl3_send_alert(s,SSL3_AL_FATAL,al); 989 err: 990 return(-1); 991 } 992 993 int ssl3_get_server_certificate(SSL *s) 994 { 995 int al,i,ok,ret= -1; 996 unsigned long n; 997 X509 *x=NULL; 998 STACK_OF(X509) *sk=NULL; 999 SESS_CERT *sc; 1000 EVP_PKEY *pkey=NULL; 1001 CBS cbs, certificate_list; 1002 const uint8_t* data; 1003 1004 n=s->method->ssl_get_message(s, 1005 SSL3_ST_CR_CERT_A, 1006 SSL3_ST_CR_CERT_B, 1007 SSL3_MT_CERTIFICATE, 1008 s->max_cert_list, 1009 SSL_GET_MESSAGE_HASH_MESSAGE, 1010 &ok); 1011 1012 if (!ok) return((int)n); 1013 1014 CBS_init(&cbs, s->init_msg, n); 1015 1016 if ((sk=sk_X509_new_null()) == NULL) 1017 { 1018 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, ERR_R_MALLOC_FAILURE); 1019 goto err; 1020 } 1021 1022 if (!CBS_get_u24_length_prefixed(&cbs, &certificate_list) || 1023 CBS_len(&cbs) != 0) 1024 { 1025 al = SSL_AD_DECODE_ERROR; 1026 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_LENGTH_MISMATCH); 1027 goto f_err; 1028 } 1029 1030 while (CBS_len(&certificate_list) > 0) 1031 { 1032 CBS certificate; 1033 if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate)) 1034 { 1035 al = SSL_AD_DECODE_ERROR; 1036 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_CERT_LENGTH_MISMATCH); 1037 goto f_err; 1038 } 1039 data = CBS_data(&certificate); 1040 x = d2i_X509(NULL, &data, CBS_len(&certificate)); 1041 if (x == NULL) 1042 { 1043 al=SSL_AD_BAD_CERTIFICATE; 1044 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, ERR_R_ASN1_LIB); 1045 goto f_err; 1046 } 1047 if (!CBS_skip(&certificate, data - CBS_data(&certificate))) 1048 { 1049 al = SSL_AD_INTERNAL_ERROR; 1050 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, ERR_R_INTERNAL_ERROR); 1051 goto f_err; 1052 } 1053 if (CBS_len(&certificate) != 0) 1054 { 1055 al = SSL_AD_DECODE_ERROR; 1056 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_CERT_LENGTH_MISMATCH); 1057 goto f_err; 1058 } 1059 if (!sk_X509_push(sk,x)) 1060 { 1061 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, ERR_R_MALLOC_FAILURE); 1062 goto err; 1063 } 1064 x=NULL; 1065 } 1066 1067 i=ssl_verify_cert_chain(s,sk); 1068 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0) 1069 ) 1070 { 1071 al=ssl_verify_alarm_type(s->verify_result); 1072 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_CERTIFICATE_VERIFY_FAILED); 1073 goto f_err; 1074 } 1075 ERR_clear_error(); /* but we keep s->verify_result */ 1076 1077 sc=ssl_sess_cert_new(); 1078 if (sc == NULL) goto err; 1079 1080 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert); 1081 s->session->sess_cert=sc; 1082 1083 sc->cert_chain=sk; 1084 /* Inconsistency alert: cert_chain does include the peer's 1085 * certificate, which we don't include in s3_srvr.c */ 1086 x=sk_X509_value(sk,0); 1087 sk=NULL; 1088 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1089 1090 pkey=X509_get_pubkey(x); 1091 1092 if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)) 1093 { 1094 x=NULL; 1095 al=SSL3_AL_FATAL; 1096 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1097 goto f_err; 1098 } 1099 1100 i=ssl_cert_type(x,pkey); 1101 if (i < 0) 1102 { 1103 x=NULL; 1104 al=SSL3_AL_FATAL; 1105 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1106 goto f_err; 1107 } 1108 1109 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher); 1110 if (exp_idx >= 0 && i != exp_idx) 1111 { 1112 x=NULL; 1113 al=SSL_AD_ILLEGAL_PARAMETER; 1114 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, SSL_R_WRONG_CERTIFICATE_TYPE); 1115 goto f_err; 1116 } 1117 sc->peer_cert_type=i; 1118 /* Why would the following ever happen? 1119 * We just created sc a couple of lines ago. */ 1120 if (sc->peer_pkeys[i].x509 != NULL) 1121 X509_free(sc->peer_pkeys[i].x509); 1122 sc->peer_pkeys[i].x509 = X509_up_ref(x); 1123 sc->peer_key = &(sc->peer_pkeys[i]); 1124 1125 if (s->session->peer != NULL) 1126 X509_free(s->session->peer); 1127 s->session->peer = X509_up_ref(x); 1128 1129 s->session->verify_result = s->verify_result; 1130 1131 x=NULL; 1132 ret=1; 1133 if (0) 1134 { 1135 f_err: 1136 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1137 } 1138 err: 1139 EVP_PKEY_free(pkey); 1140 X509_free(x); 1141 sk_X509_pop_free(sk,X509_free); 1142 return(ret); 1143 } 1144 1145 int ssl3_get_server_key_exchange(SSL *s) 1146 { 1147 EVP_MD_CTX md_ctx; 1148 int al,ok; 1149 long n,alg_k,alg_a; 1150 EVP_PKEY *pkey=NULL; 1151 const EVP_MD *md = NULL; 1152 RSA *rsa=NULL; 1153 DH *dh=NULL; 1154 EC_KEY *ecdh = NULL; 1155 BN_CTX *bn_ctx = NULL; 1156 EC_POINT *srvr_ecpoint = NULL; 1157 CBS server_key_exchange, server_key_exchange_orig, parameter; 1158 1159 /* use same message size as in ssl3_get_certificate_request() 1160 * as ServerKeyExchange message may be skipped */ 1161 n=s->method->ssl_get_message(s, 1162 SSL3_ST_CR_KEY_EXCH_A, 1163 SSL3_ST_CR_KEY_EXCH_B, 1164 -1, 1165 s->max_cert_list, 1166 SSL_GET_MESSAGE_HASH_MESSAGE, 1167 &ok); 1168 if (!ok) return((int)n); 1169 1170 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) 1171 { 1172 if (ssl_cipher_requires_server_key_exchange(s->s3->tmp.new_cipher)) 1173 { 1174 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_UNEXPECTED_MESSAGE); 1175 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1176 return -1; 1177 } 1178 1179 /* In plain PSK ciphersuite, ServerKeyExchange can be 1180 omitted if no identity hint is sent. Set 1181 session->sess_cert anyway to avoid problems 1182 later.*/ 1183 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK) 1184 { 1185 /* PSK ciphersuites that also send a 1186 * Certificate would have already initialized 1187 * |sess_cert|. */ 1188 if (s->session->sess_cert == NULL) 1189 s->session->sess_cert = ssl_sess_cert_new(); 1190 if (s->session->psk_identity_hint) 1191 { 1192 OPENSSL_free(s->session->psk_identity_hint); 1193 s->session->psk_identity_hint = NULL; 1194 } 1195 } 1196 s->s3->tmp.reuse_message=1; 1197 return(1); 1198 } 1199 1200 /* Retain a copy of the original CBS to compute the signature 1201 * over. */ 1202 CBS_init(&server_key_exchange, s->init_msg, n); 1203 server_key_exchange_orig = server_key_exchange; 1204 1205 if (s->session->sess_cert != NULL) 1206 { 1207 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1208 { 1209 RSA_free(s->session->sess_cert->peer_rsa_tmp); 1210 s->session->sess_cert->peer_rsa_tmp=NULL; 1211 } 1212 if (s->session->sess_cert->peer_dh_tmp) 1213 { 1214 DH_free(s->session->sess_cert->peer_dh_tmp); 1215 s->session->sess_cert->peer_dh_tmp=NULL; 1216 } 1217 if (s->session->sess_cert->peer_ecdh_tmp) 1218 { 1219 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); 1220 s->session->sess_cert->peer_ecdh_tmp=NULL; 1221 } 1222 } 1223 else 1224 { 1225 s->session->sess_cert=ssl_sess_cert_new(); 1226 } 1227 1228 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 1229 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 1230 EVP_MD_CTX_init(&md_ctx); 1231 1232 if (alg_a & SSL_aPSK) 1233 { 1234 CBS psk_identity_hint; 1235 1236 /* Each of the PSK key exchanges begins with a 1237 * psk_identity_hint. */ 1238 if (!CBS_get_u16_length_prefixed(&server_key_exchange, &psk_identity_hint)) 1239 { 1240 al = SSL_AD_DECODE_ERROR; 1241 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DECODE_ERROR); 1242 goto f_err; 1243 } 1244 1245 /* Store PSK identity hint for later use, hint is used in 1246 * ssl3_send_client_key_exchange. Assume that the maximum 1247 * length of a PSK identity hint can be as long as the maximum 1248 * length of a PSK identity. Also do not allow NULL 1249 * characters; identities are saved as C strings. 1250 * 1251 * TODO(davidben): Should invalid hints be ignored? It's a hint 1252 * rather than a specific identity. */ 1253 if (CBS_len(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN || 1254 CBS_contains_zero_byte(&psk_identity_hint)) 1255 { 1256 al = SSL_AD_HANDSHAKE_FAILURE; 1257 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DATA_LENGTH_TOO_LONG); 1258 goto f_err; 1259 } 1260 1261 /* Save the identity hint as a C string. */ 1262 if (!CBS_strdup(&psk_identity_hint, &s->session->psk_identity_hint)) 1263 { 1264 al = SSL_AD_HANDSHAKE_FAILURE; 1265 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_MALLOC_FAILURE); 1266 goto f_err; 1267 } 1268 } 1269 1270 if (alg_k & SSL_kRSA) 1271 { 1272 CBS rsa_modulus, rsa_exponent; 1273 1274 /* TODO(davidben): This was originally for export 1275 * reasons. Do we still need to support it? */ 1276 1277 if (!CBS_get_u16_length_prefixed(&server_key_exchange, &rsa_modulus) || 1278 CBS_len(&rsa_modulus) == 0 || 1279 !CBS_get_u16_length_prefixed(&server_key_exchange, &rsa_exponent) || 1280 CBS_len(&rsa_exponent) == 0) 1281 { 1282 al = SSL_AD_DECODE_ERROR; 1283 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DECODE_ERROR); 1284 goto f_err; 1285 } 1286 1287 if ((rsa=RSA_new()) == NULL) 1288 { 1289 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_MALLOC_FAILURE); 1290 goto err; 1291 } 1292 1293 if (!(rsa->n = BN_bin2bn(CBS_data(&rsa_modulus), 1294 CBS_len(&rsa_modulus), rsa->n))) 1295 { 1296 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_BN_LIB); 1297 goto err; 1298 } 1299 1300 if (!(rsa->e = BN_bin2bn(CBS_data(&rsa_exponent), 1301 CBS_len(&rsa_exponent), rsa->e))) 1302 { 1303 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_BN_LIB); 1304 goto err; 1305 } 1306 1307 /* this should be because we are using an export cipher */ 1308 if (alg_a & SSL_aRSA) 1309 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1310 else 1311 { 1312 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_INTERNAL_ERROR); 1313 goto err; 1314 } 1315 s->session->sess_cert->peer_rsa_tmp=rsa; 1316 rsa=NULL; 1317 } 1318 else if (alg_k & SSL_kEDH) 1319 { 1320 CBS dh_p, dh_g, dh_Ys; 1321 1322 if (!CBS_get_u16_length_prefixed(&server_key_exchange, &dh_p) || 1323 CBS_len(&dh_p) == 0 || 1324 !CBS_get_u16_length_prefixed(&server_key_exchange, &dh_g) || 1325 CBS_len(&dh_g) == 0 || 1326 !CBS_get_u16_length_prefixed(&server_key_exchange, &dh_Ys) || 1327 CBS_len(&dh_Ys) == 0) 1328 { 1329 al = SSL_AD_DECODE_ERROR; 1330 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DECODE_ERROR); 1331 goto f_err; 1332 } 1333 1334 if ((dh=DH_new()) == NULL) 1335 { 1336 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_DH_LIB); 1337 goto err; 1338 } 1339 1340 if (!(dh->p = BN_bin2bn(CBS_data(&dh_p), CBS_len(&dh_p), NULL))) 1341 { 1342 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_BN_LIB); 1343 goto err; 1344 } 1345 if (!(dh->g=BN_bin2bn(CBS_data(&dh_g), CBS_len(&dh_g), NULL))) 1346 { 1347 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_BN_LIB); 1348 goto err; 1349 } 1350 if (!(dh->pub_key = BN_bin2bn(CBS_data(&dh_Ys), CBS_len(&dh_Ys), NULL))) 1351 { 1352 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_BN_LIB); 1353 goto err; 1354 } 1355 1356 if (DH_size(dh) < 512/8) 1357 { 1358 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_BAD_DH_P_LENGTH); 1359 goto err; 1360 } 1361 1362 if (alg_a & SSL_aRSA) 1363 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1364 /* else anonymous DH, so no certificate or pkey. */ 1365 1366 s->session->sess_cert->peer_dh_tmp=dh; 1367 dh=NULL; 1368 } 1369 1370 else if (alg_k & SSL_kEECDH) 1371 { 1372 uint16_t curve_id; 1373 int curve_nid = 0; 1374 EC_GROUP *ngroup; 1375 const EC_GROUP *group; 1376 CBS point; 1377 1378 /* Extract elliptic curve parameters and the server's 1379 * ephemeral ECDH public key. Check curve is one of 1380 * our preferences, if not server has sent an invalid 1381 * curve. 1382 */ 1383 if (!tls1_check_curve(s, &server_key_exchange, &curve_id)) 1384 { 1385 al = SSL_AD_DECODE_ERROR; 1386 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_WRONG_CURVE); 1387 goto f_err; 1388 } 1389 1390 if ((curve_nid = tls1_ec_curve_id2nid(curve_id)) == 0) 1391 { 1392 al=SSL_AD_INTERNAL_ERROR; 1393 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1394 goto f_err; 1395 } 1396 1397 if ((ecdh=EC_KEY_new()) == NULL) 1398 { 1399 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_MALLOC_FAILURE); 1400 goto err; 1401 } 1402 ngroup = EC_GROUP_new_by_curve_name(curve_nid); 1403 if (ngroup == NULL) 1404 { 1405 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_EC_LIB); 1406 goto err; 1407 } 1408 if (EC_KEY_set_group(ecdh, ngroup) == 0) 1409 { 1410 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_EC_LIB); 1411 goto err; 1412 } 1413 EC_GROUP_free(ngroup); 1414 1415 group = EC_KEY_get0_group(ecdh); 1416 1417 /* Next, get the encoded ECPoint */ 1418 if (!CBS_get_u8_length_prefixed(&server_key_exchange, &point)) 1419 { 1420 al = SSL_AD_DECODE_ERROR; 1421 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DECODE_ERROR); 1422 goto f_err; 1423 } 1424 1425 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || 1426 ((bn_ctx = BN_CTX_new()) == NULL)) 1427 { 1428 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_MALLOC_FAILURE); 1429 goto err; 1430 } 1431 1432 if (!EC_POINT_oct2point(group, srvr_ecpoint, 1433 CBS_data(&point), CBS_len(&point), bn_ctx)) 1434 { 1435 al = SSL_AD_DECODE_ERROR; 1436 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_BAD_ECPOINT); 1437 goto f_err; 1438 } 1439 1440 /* The ECC/TLS specification does not mention 1441 * the use of DSA to sign ECParameters in the server 1442 * key exchange message. We do support RSA and ECDSA. 1443 */ 1444 if (0) ; 1445 else if (alg_a & SSL_aRSA) 1446 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1447 else if (alg_a & SSL_aECDSA) 1448 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1449 /* else anonymous ECDH, so no certificate or pkey. */ 1450 EC_KEY_set_public_key(ecdh, srvr_ecpoint); 1451 s->session->sess_cert->peer_ecdh_tmp=ecdh; 1452 ecdh=NULL; 1453 BN_CTX_free(bn_ctx); 1454 bn_ctx = NULL; 1455 EC_POINT_free(srvr_ecpoint); 1456 srvr_ecpoint = NULL; 1457 } 1458 1459 else if (!(alg_k & SSL_kPSK)) 1460 { 1461 al=SSL_AD_UNEXPECTED_MESSAGE; 1462 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_UNEXPECTED_MESSAGE); 1463 goto f_err; 1464 } 1465 1466 /* At this point, |server_key_exchange| contains the 1467 * signature, if any, while |server_key_exchange_orig| 1468 * contains the entire message. From that, derive a CBS 1469 * containing just the parameter. */ 1470 CBS_init(¶meter, CBS_data(&server_key_exchange_orig), 1471 CBS_len(&server_key_exchange_orig) - 1472 CBS_len(&server_key_exchange)); 1473 1474 /* if it was signed, check the signature */ 1475 if (pkey != NULL) 1476 { 1477 CBS signature; 1478 1479 if (SSL_USE_SIGALGS(s)) 1480 { 1481 if (!tls12_check_peer_sigalg(&md, &al, s, &server_key_exchange, pkey)) 1482 goto f_err; 1483 } 1484 else 1485 md = EVP_sha1(); 1486 1487 /* The last field in |server_key_exchange| is the 1488 * signature. */ 1489 if (!CBS_get_u16_length_prefixed(&server_key_exchange, &signature) || 1490 CBS_len(&server_key_exchange) != 0) 1491 { 1492 al = SSL_AD_DECODE_ERROR; 1493 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_DECODE_ERROR); 1494 goto f_err; 1495 } 1496 1497 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) 1498 { 1499 int num; 1500 unsigned char *q, md_buf[EVP_MAX_MD_SIZE*2]; 1501 size_t md_len = 0; 1502 1503 q=md_buf; 1504 for (num=2; num > 0; num--) 1505 { 1506 unsigned int digest_len; 1507 EVP_DigestInit_ex(&md_ctx, 1508 (num == 2) ? EVP_md5() : EVP_sha1(), NULL); 1509 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1510 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1511 EVP_DigestUpdate(&md_ctx, CBS_data(¶meter), CBS_len(¶meter)); 1512 EVP_DigestFinal_ex(&md_ctx, q, &digest_len); 1513 q += digest_len; 1514 md_len += digest_len; 1515 } 1516 if (!RSA_verify(NID_md5_sha1, md_buf, md_len, 1517 CBS_data(&signature), CBS_len(&signature), 1518 pkey->pkey.rsa)) 1519 { 1520 al = SSL_AD_DECRYPT_ERROR; 1521 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_BAD_SIGNATURE); 1522 goto f_err; 1523 } 1524 } 1525 else 1526 { 1527 EVP_VerifyInit_ex(&md_ctx, md, NULL); 1528 EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1529 EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1530 EVP_VerifyUpdate(&md_ctx, CBS_data(¶meter), CBS_len(¶meter)); 1531 if (EVP_VerifyFinal(&md_ctx, CBS_data(&signature), CBS_len(&signature), pkey) <= 0) 1532 { 1533 /* bad signature */ 1534 al=SSL_AD_DECRYPT_ERROR; 1535 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_BAD_SIGNATURE); 1536 goto f_err; 1537 } 1538 } 1539 } 1540 else 1541 { 1542 if (ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) 1543 { 1544 /* Might be wrong key type, check it */ 1545 if (ssl3_check_cert_and_algorithm(s)) 1546 /* Otherwise this shouldn't happen */ 1547 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, ERR_R_INTERNAL_ERROR); 1548 goto err; 1549 } 1550 /* still data left over */ 1551 if (CBS_len(&server_key_exchange) > 0) 1552 { 1553 al=SSL_AD_DECODE_ERROR; 1554 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_key_exchange, SSL_R_EXTRA_DATA_IN_MESSAGE); 1555 goto f_err; 1556 } 1557 } 1558 EVP_PKEY_free(pkey); 1559 EVP_MD_CTX_cleanup(&md_ctx); 1560 return(1); 1561 f_err: 1562 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1563 err: 1564 EVP_PKEY_free(pkey); 1565 if (rsa != NULL) 1566 RSA_free(rsa); 1567 if (dh != NULL) 1568 DH_free(dh); 1569 BN_CTX_free(bn_ctx); 1570 EC_POINT_free(srvr_ecpoint); 1571 if (ecdh != NULL) 1572 EC_KEY_free(ecdh); 1573 EVP_MD_CTX_cleanup(&md_ctx); 1574 return(-1); 1575 } 1576 1577 static int ca_dn_cmp(const X509_NAME **a, const X509_NAME **b) 1578 { 1579 return(X509_NAME_cmp(*a,*b)); 1580 } 1581 1582 int ssl3_get_certificate_request(SSL *s) 1583 { 1584 int ok,ret=0; 1585 unsigned long n; 1586 unsigned int i; 1587 X509_NAME *xn=NULL; 1588 STACK_OF(X509_NAME) *ca_sk=NULL; 1589 CBS cbs; 1590 CBS certificate_types; 1591 CBS certificate_authorities; 1592 const uint8_t *data; 1593 1594 n=s->method->ssl_get_message(s, 1595 SSL3_ST_CR_CERT_REQ_A, 1596 SSL3_ST_CR_CERT_REQ_B, 1597 -1, 1598 s->max_cert_list, 1599 SSL_GET_MESSAGE_HASH_MESSAGE, 1600 &ok); 1601 1602 if (!ok) return((int)n); 1603 1604 s->s3->tmp.cert_req=0; 1605 1606 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) 1607 { 1608 s->s3->tmp.reuse_message=1; 1609 /* If we get here we don't need any cached handshake records 1610 * as we wont be doing client auth. 1611 */ 1612 if (s->s3->handshake_buffer) 1613 { 1614 if (!ssl3_digest_cached_records(s)) 1615 goto err; 1616 } 1617 return(1); 1618 } 1619 1620 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) 1621 { 1622 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1623 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_WRONG_MESSAGE_TYPE); 1624 goto err; 1625 } 1626 1627 /* TLS does not like anon-DH with client cert */ 1628 if (s->version > SSL3_VERSION) 1629 { 1630 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1631 { 1632 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 1633 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1634 goto err; 1635 } 1636 } 1637 1638 CBS_init(&cbs, s->init_msg, n); 1639 1640 ca_sk = sk_X509_NAME_new(ca_dn_cmp); 1641 if (ca_sk == NULL) 1642 { 1643 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, ERR_R_MALLOC_FAILURE); 1644 goto err; 1645 } 1646 1647 /* get the certificate types */ 1648 if (!CBS_get_u8_length_prefixed(&cbs, &certificate_types)) 1649 { 1650 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1651 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_DECODE_ERROR); 1652 goto err; 1653 } 1654 if (!CBS_stow(&certificate_types, 1655 &s->s3->tmp.certificate_types, 1656 &s->s3->tmp.num_certificate_types)) 1657 { 1658 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 1659 goto err; 1660 } 1661 if (SSL_USE_SIGALGS(s)) 1662 { 1663 CBS supported_signature_algorithms; 1664 if (!CBS_get_u16_length_prefixed(&cbs, &supported_signature_algorithms)) 1665 { 1666 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1667 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_DECODE_ERROR); 1668 goto err; 1669 } 1670 /* Clear certificate digests and validity flags */ 1671 for (i = 0; i < SSL_PKEY_NUM; i++) 1672 { 1673 s->cert->pkeys[i].digest = NULL; 1674 s->cert->pkeys[i].valid_flags = 0; 1675 } 1676 if (!tls1_process_sigalgs(s, &supported_signature_algorithms)) 1677 { 1678 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1679 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1680 goto err; 1681 } 1682 } 1683 1684 /* get the CA RDNs */ 1685 if (!CBS_get_u16_length_prefixed(&cbs, &certificate_authorities)) 1686 { 1687 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1688 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_LENGTH_MISMATCH); 1689 goto err; 1690 } 1691 1692 while (CBS_len(&certificate_authorities) > 0) 1693 { 1694 CBS distinguished_name; 1695 if (!CBS_get_u16_length_prefixed(&certificate_authorities, &distinguished_name)) 1696 { 1697 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1698 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_CA_DN_TOO_LONG); 1699 goto err; 1700 } 1701 1702 data = CBS_data(&distinguished_name); 1703 if ((xn=d2i_X509_NAME(NULL, &data, CBS_len(&distinguished_name))) == NULL) 1704 { 1705 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1706 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, ERR_R_ASN1_LIB); 1707 goto err; 1708 } 1709 1710 if (!CBS_skip(&distinguished_name, data - CBS_data(&distinguished_name))) 1711 { 1712 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1713 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_certificate, ERR_R_INTERNAL_ERROR); 1714 goto err; 1715 } 1716 if (CBS_len(&distinguished_name) != 0) 1717 { 1718 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1719 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, SSL_R_CA_DN_LENGTH_MISMATCH); 1720 goto err; 1721 } 1722 if (!sk_X509_NAME_push(ca_sk,xn)) 1723 { 1724 OPENSSL_PUT_ERROR(SSL, ssl3_get_certificate_request, ERR_R_MALLOC_FAILURE); 1725 goto err; 1726 } 1727 } 1728 1729 /* we should setup a certificate to return.... */ 1730 s->s3->tmp.cert_req=1; 1731 if (s->s3->tmp.ca_names != NULL) 1732 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free); 1733 s->s3->tmp.ca_names=ca_sk; 1734 ca_sk=NULL; 1735 1736 ret=1; 1737 err: 1738 if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free); 1739 return(ret); 1740 } 1741 1742 int ssl3_get_new_session_ticket(SSL *s) 1743 { 1744 int ok,al,ret=0; 1745 long n; 1746 CBS new_session_ticket, ticket; 1747 1748 n=s->method->ssl_get_message(s, 1749 SSL3_ST_CR_SESSION_TICKET_A, 1750 SSL3_ST_CR_SESSION_TICKET_B, 1751 SSL3_MT_NEWSESSION_TICKET, 1752 16384, 1753 SSL_GET_MESSAGE_HASH_MESSAGE, 1754 &ok); 1755 1756 if (!ok) 1757 return((int)n); 1758 1759 CBS_init(&new_session_ticket, s->init_msg, n); 1760 1761 if (!CBS_get_u32(&new_session_ticket, &s->session->tlsext_tick_lifetime_hint) || 1762 !CBS_get_u16_length_prefixed(&new_session_ticket, &ticket) || 1763 CBS_len(&new_session_ticket) != 0) 1764 { 1765 al = SSL_AD_DECODE_ERROR; 1766 OPENSSL_PUT_ERROR(SSL, ssl3_get_new_session_ticket, SSL_R_DECODE_ERROR); 1767 goto f_err; 1768 } 1769 1770 if (!CBS_stow(&ticket, &s->session->tlsext_tick, &s->session->tlsext_ticklen)) 1771 { 1772 OPENSSL_PUT_ERROR(SSL, ssl3_get_new_session_ticket, ERR_R_MALLOC_FAILURE); 1773 goto err; 1774 } 1775 1776 /* There are two ways to detect a resumed ticket sesion. 1777 * One is to set an appropriate session ID and then the server 1778 * must return a match in ServerHello. This allows the normal 1779 * client session ID matching to work and we know much 1780 * earlier that the ticket has been accepted. 1781 * 1782 * The other way is to set zero length session ID when the 1783 * ticket is presented and rely on the handshake to determine 1784 * session resumption. 1785 * 1786 * We choose the former approach because this fits in with 1787 * assumptions elsewhere in OpenSSL. The session ID is set 1788 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1789 * ticket. 1790 */ 1791 EVP_Digest(CBS_data(&ticket), CBS_len(&ticket), 1792 s->session->session_id, &s->session->session_id_length, 1793 EVP_sha256(), NULL); 1794 ret=1; 1795 return(ret); 1796 f_err: 1797 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1798 err: 1799 return(-1); 1800 } 1801 1802 int ssl3_get_cert_status(SSL *s) 1803 { 1804 int ok, al; 1805 long n; 1806 CBS certificate_status, ocsp_response; 1807 uint8_t status_type; 1808 1809 n=s->method->ssl_get_message(s, 1810 SSL3_ST_CR_CERT_STATUS_A, 1811 SSL3_ST_CR_CERT_STATUS_B, 1812 SSL3_MT_CERTIFICATE_STATUS, 1813 16384, 1814 SSL_GET_MESSAGE_HASH_MESSAGE, 1815 &ok); 1816 1817 if (!ok) return((int)n); 1818 1819 CBS_init(&certificate_status, s->init_msg, n); 1820 if (!CBS_get_u8(&certificate_status, &status_type) || 1821 status_type != TLSEXT_STATUSTYPE_ocsp || 1822 !CBS_get_u24_length_prefixed(&certificate_status, &ocsp_response) || 1823 CBS_len(&ocsp_response) == 0 || 1824 CBS_len(&certificate_status) != 0) 1825 { 1826 al = SSL_AD_DECODE_ERROR; 1827 OPENSSL_PUT_ERROR(SSL, ssl3_get_cert_status, SSL_R_DECODE_ERROR); 1828 goto f_err; 1829 } 1830 1831 if (!CBS_stow(&ocsp_response, 1832 &s->session->ocsp_response, &s->session->ocsp_response_length)) 1833 { 1834 al = SSL_AD_INTERNAL_ERROR; 1835 OPENSSL_PUT_ERROR(SSL, ssl3_get_cert_status, ERR_R_MALLOC_FAILURE); 1836 goto f_err; 1837 } 1838 return 1; 1839 f_err: 1840 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1841 return(-1); 1842 } 1843 1844 int ssl3_get_server_done(SSL *s) 1845 { 1846 int ok,ret=0; 1847 long n; 1848 1849 n=s->method->ssl_get_message(s, 1850 SSL3_ST_CR_SRVR_DONE_A, 1851 SSL3_ST_CR_SRVR_DONE_B, 1852 SSL3_MT_SERVER_DONE, 1853 30, /* should be very small, like 0 :-) */ 1854 SSL_GET_MESSAGE_HASH_MESSAGE, 1855 &ok); 1856 1857 if (!ok) return((int)n); 1858 if (n > 0) 1859 { 1860 /* should contain no data */ 1861 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR); 1862 OPENSSL_PUT_ERROR(SSL, ssl3_get_server_done, SSL_R_LENGTH_MISMATCH); 1863 return -1; 1864 } 1865 ret=1; 1866 return(ret); 1867 } 1868 1869 1870 int ssl3_send_client_key_exchange(SSL *s) 1871 { 1872 unsigned char *p; 1873 int n = 0; 1874 unsigned long alg_k; 1875 unsigned long alg_a; 1876 unsigned char *q; 1877 EVP_PKEY *pkey=NULL; 1878 EC_KEY *clnt_ecdh = NULL; 1879 const EC_POINT *srvr_ecpoint = NULL; 1880 EVP_PKEY *srvr_pub_pkey = NULL; 1881 unsigned char *encodedPoint = NULL; 1882 int encoded_pt_len = 0; 1883 BN_CTX * bn_ctx = NULL; 1884 unsigned int psk_len = 0; 1885 unsigned char psk[PSK_MAX_PSK_LEN]; 1886 1887 if (s->state == SSL3_ST_CW_KEY_EXCH_A) 1888 { 1889 p = ssl_handshake_start(s); 1890 1891 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 1892 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 1893 1894 if (alg_a & SSL_aPSK) 1895 { 1896 char identity[PSK_MAX_IDENTITY_LEN + 1]; 1897 size_t identity_len; 1898 unsigned char *t = NULL; 1899 unsigned char pre_ms[PSK_MAX_PSK_LEN*2+4]; 1900 unsigned int pre_ms_len = 0; 1901 int psk_err = 1; 1902 1903 n = 0; 1904 if (s->psk_client_callback == NULL) 1905 { 1906 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, SSL_R_PSK_NO_CLIENT_CB); 1907 goto err; 1908 } 1909 1910 memset(identity, 0, sizeof(identity)); 1911 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 1912 identity, sizeof(identity), psk, sizeof(psk)); 1913 if (psk_len > PSK_MAX_PSK_LEN) 1914 { 1915 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 1916 goto psk_err; 1917 } 1918 else if (psk_len == 0) 1919 { 1920 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, SSL_R_PSK_IDENTITY_NOT_FOUND); 1921 goto psk_err; 1922 } 1923 identity_len = OPENSSL_strnlen(identity, sizeof(identity)); 1924 if (identity_len > PSK_MAX_IDENTITY_LEN) 1925 { 1926 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 1927 goto psk_err; 1928 } 1929 1930 if (!(alg_k & SSL_kEECDH)) 1931 { 1932 /* Create the shared secret now if we're not using ECDHE-PSK. 1933 * TODO(davidben): Refactor this logic similarly 1934 * to ssl3_get_client_key_exchange. */ 1935 pre_ms_len = 2+psk_len+2+psk_len; 1936 t = pre_ms; 1937 s2n(psk_len, t); 1938 memset(t, 0, psk_len); 1939 t+=psk_len; 1940 s2n(psk_len, t); 1941 memcpy(t, psk, psk_len); 1942 1943 s->session->master_key_length = 1944 s->method->ssl3_enc->generate_master_secret(s, 1945 s->session->master_key, 1946 pre_ms, pre_ms_len); 1947 s2n(identity_len, p); 1948 memcpy(p, identity, identity_len); 1949 n = 2 + identity_len; 1950 } 1951 1952 if (s->session->psk_identity != NULL) 1953 OPENSSL_free(s->session->psk_identity); 1954 s->session->psk_identity = BUF_strdup(identity); 1955 if (s->session->psk_identity == NULL) 1956 { 1957 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_MALLOC_FAILURE); 1958 goto psk_err; 1959 } 1960 psk_err = 0; 1961 psk_err: 1962 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN); 1963 OPENSSL_cleanse(pre_ms, sizeof(pre_ms)); 1964 if (psk_err != 0) 1965 { 1966 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1967 goto err; 1968 } 1969 } 1970 1971 if (alg_k & SSL_kRSA) 1972 { 1973 RSA *rsa; 1974 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 1975 1976 if (s->session->sess_cert == NULL) 1977 { 1978 /* We should always have a server certificate with SSL_kRSA. */ 1979 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 1980 goto err; 1981 } 1982 1983 if (s->session->sess_cert->peer_rsa_tmp != NULL) 1984 rsa=s->session->sess_cert->peer_rsa_tmp; 1985 else 1986 { 1987 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1988 if ((pkey == NULL) || 1989 (pkey->type != EVP_PKEY_RSA) || 1990 (pkey->pkey.rsa == NULL)) 1991 { 1992 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 1993 goto err; 1994 } 1995 rsa=pkey->pkey.rsa; 1996 EVP_PKEY_free(pkey); 1997 } 1998 1999 tmp_buf[0]=s->client_version>>8; 2000 tmp_buf[1]=s->client_version&0xff; 2001 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0) 2002 goto err; 2003 2004 s->session->master_key_length=sizeof tmp_buf; 2005 2006 q=p; 2007 /* Fix buf for TLS and beyond */ 2008 if (s->version > SSL3_VERSION) 2009 p+=2; 2010 n=RSA_public_encrypt(sizeof tmp_buf, 2011 tmp_buf,p,rsa,RSA_PKCS1_PADDING); 2012 if (n <= 0) 2013 { 2014 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, SSL_R_BAD_RSA_ENCRYPT); 2015 goto err; 2016 } 2017 2018 /* Log the premaster secret, if logging is enabled. */ 2019 if (!ssl_ctx_log_rsa_client_key_exchange(s->ctx, 2020 p, n, tmp_buf, sizeof(tmp_buf))) 2021 { 2022 goto err; 2023 } 2024 2025 /* Fix buf for TLS and beyond */ 2026 if (s->version > SSL3_VERSION) 2027 { 2028 s2n(n,q); 2029 n+=2; 2030 } 2031 2032 s->session->master_key_length= 2033 s->method->ssl3_enc->generate_master_secret(s, 2034 s->session->master_key, 2035 tmp_buf,sizeof tmp_buf); 2036 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf); 2037 } 2038 else if (alg_k & SSL_kEDH) 2039 { 2040 DH *dh_srvr,*dh_clnt; 2041 SESS_CERT *scert = s->session->sess_cert; 2042 2043 if (scert == NULL) 2044 { 2045 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2046 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, SSL_R_UNEXPECTED_MESSAGE); 2047 goto err; 2048 } 2049 2050 if (scert->peer_dh_tmp == NULL) 2051 { 2052 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 2053 goto err; 2054 } 2055 dh_srvr=scert->peer_dh_tmp; 2056 2057 /* generate a new random key */ 2058 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL) 2059 { 2060 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_DH_LIB); 2061 goto err; 2062 } 2063 if (!DH_generate_key(dh_clnt)) 2064 { 2065 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_DH_LIB); 2066 DH_free(dh_clnt); 2067 goto err; 2068 } 2069 2070 /* use the 'p' output buffer for the DH key, but 2071 * make sure to clear it out afterwards */ 2072 2073 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt); 2074 if (n <= 0) 2075 { 2076 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_DH_LIB); 2077 DH_free(dh_clnt); 2078 goto err; 2079 } 2080 2081 /* generate master key from the result */ 2082 s->session->master_key_length= 2083 s->method->ssl3_enc->generate_master_secret(s, 2084 s->session->master_key,p,n); 2085 /* clean up */ 2086 memset(p,0,n); 2087 2088 /* send off the data */ 2089 n=BN_num_bytes(dh_clnt->pub_key); 2090 s2n(n,p); 2091 BN_bn2bin(dh_clnt->pub_key,p); 2092 n+=2; 2093 2094 DH_free(dh_clnt); 2095 2096 /* perhaps clean things up a bit EAY EAY EAY EAY*/ 2097 } 2098 2099 else if (alg_k & SSL_kEECDH) 2100 { 2101 const EC_GROUP *srvr_group = NULL; 2102 EC_KEY *tkey; 2103 int field_size = 0; 2104 unsigned char *pre_ms; 2105 unsigned char *t; 2106 unsigned int pre_ms_len; 2107 unsigned int i; 2108 2109 if (s->session->sess_cert == NULL) 2110 { 2111 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE); 2112 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, SSL_R_UNEXPECTED_MESSAGE); 2113 goto err; 2114 } 2115 2116 if (s->session->sess_cert->peer_ecdh_tmp == NULL) 2117 { 2118 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 2119 goto err; 2120 } 2121 tkey = s->session->sess_cert->peer_ecdh_tmp; 2122 2123 srvr_group = EC_KEY_get0_group(tkey); 2124 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 2125 2126 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) 2127 { 2128 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 2129 goto err; 2130 } 2131 2132 if ((clnt_ecdh=EC_KEY_new()) == NULL) 2133 { 2134 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_MALLOC_FAILURE); 2135 goto err; 2136 } 2137 2138 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) 2139 { 2140 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_EC_LIB); 2141 goto err; 2142 } 2143 /* Generate a new ECDH key pair */ 2144 if (!(EC_KEY_generate_key(clnt_ecdh))) 2145 { 2146 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_ECDH_LIB); 2147 goto err; 2148 } 2149 2150 /* use the 'p' output buffer for the ECDH key, but 2151 * make sure to clear it out afterwards 2152 */ 2153 2154 field_size = EC_GROUP_get_degree(srvr_group); 2155 if (field_size <= 0) 2156 { 2157 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_ECDH_LIB); 2158 goto err; 2159 } 2160 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL); 2161 if (n <= 0) 2162 { 2163 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_ECDH_LIB); 2164 goto err; 2165 } 2166 2167 /* ECDHE PSK ciphersuites from RFC 5489 */ 2168 if ((alg_a & SSL_aPSK) && psk_len != 0) 2169 { 2170 pre_ms_len = 2+psk_len+2+n; 2171 pre_ms = OPENSSL_malloc(pre_ms_len); 2172 if (pre_ms == NULL) 2173 { 2174 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_MALLOC_FAILURE); 2175 goto err; 2176 } 2177 memset(pre_ms, 0, pre_ms_len); 2178 t = pre_ms; 2179 s2n(psk_len, t); 2180 memcpy(t, psk, psk_len); 2181 t += psk_len; 2182 s2n(n, t); 2183 memcpy(t, p, n); 2184 s->session->master_key_length = s->method->ssl3_enc \ 2185 -> generate_master_secret(s, 2186 s->session->master_key, pre_ms, pre_ms_len); 2187 OPENSSL_cleanse(pre_ms, pre_ms_len); 2188 OPENSSL_free(pre_ms); 2189 } 2190 if (!(alg_a & SSL_aPSK)) 2191 { 2192 /* generate master key from the result */ 2193 s->session->master_key_length = s->method->ssl3_enc \ 2194 -> generate_master_secret(s, 2195 s->session->master_key, p, n); 2196 } 2197 memset(p, 0, n); /* clean up */ 2198 2199 /* First check the size of encoding and 2200 * allocate memory accordingly. 2201 */ 2202 encoded_pt_len = 2203 EC_POINT_point2oct(srvr_group, 2204 EC_KEY_get0_public_key(clnt_ecdh), 2205 POINT_CONVERSION_UNCOMPRESSED, 2206 NULL, 0, NULL); 2207 2208 encodedPoint = (unsigned char *) 2209 OPENSSL_malloc(encoded_pt_len * 2210 sizeof(unsigned char)); 2211 bn_ctx = BN_CTX_new(); 2212 if ((encodedPoint == NULL) || 2213 (bn_ctx == NULL)) 2214 { 2215 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_MALLOC_FAILURE); 2216 goto err; 2217 } 2218 2219 /* Encode the public key */ 2220 encoded_pt_len = EC_POINT_point2oct(srvr_group, 2221 EC_KEY_get0_public_key(clnt_ecdh), 2222 POINT_CONVERSION_UNCOMPRESSED, 2223 encodedPoint, encoded_pt_len, bn_ctx); 2224 2225 n = 0; 2226 if ((alg_a & SSL_aPSK) && psk_len != 0) 2227 { 2228 i = strlen(s->session->psk_identity); 2229 s2n(i, p); 2230 memcpy(p, s->session->psk_identity, i); 2231 p += i; 2232 n = i + 2; 2233 } 2234 2235 *p = encoded_pt_len; /* length of encoded point */ 2236 /* Encoded point will be copied here */ 2237 p += 1; 2238 n += 1; 2239 /* copy the point */ 2240 memcpy((unsigned char *)p, encodedPoint, encoded_pt_len); 2241 /* increment n to account for length field */ 2242 n += encoded_pt_len; 2243 2244 /* Free allocated memory */ 2245 BN_CTX_free(bn_ctx); 2246 OPENSSL_free(encodedPoint); 2247 EC_KEY_free(clnt_ecdh); 2248 EVP_PKEY_free(srvr_pub_pkey); 2249 } 2250 else if (!(alg_k & SSL_kPSK) || ((alg_k & SSL_kPSK) && !(alg_a & SSL_aPSK))) 2251 { 2252 ssl3_send_alert(s, SSL3_AL_FATAL, 2253 SSL_AD_HANDSHAKE_FAILURE); 2254 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_key_exchange, ERR_R_INTERNAL_ERROR); 2255 goto err; 2256 } 2257 2258 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n); 2259 s->state=SSL3_ST_CW_KEY_EXCH_B; 2260 } 2261 2262 /* SSL3_ST_CW_KEY_EXCH_B */ 2263 return ssl_do_write(s); 2264 err: 2265 BN_CTX_free(bn_ctx); 2266 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 2267 if (clnt_ecdh != NULL) 2268 EC_KEY_free(clnt_ecdh); 2269 EVP_PKEY_free(srvr_pub_pkey); 2270 return(-1); 2271 } 2272 2273 int ssl3_send_cert_verify(SSL *s) 2274 { 2275 unsigned char *buf, *p; 2276 const EVP_MD *md = NULL; 2277 uint8_t digest[EVP_MAX_MD_SIZE]; 2278 size_t digest_length; 2279 EVP_PKEY *pkey; 2280 EVP_PKEY_CTX *pctx = NULL; 2281 size_t signature_length = 0; 2282 unsigned long n = 0; 2283 2284 buf=(unsigned char *)s->init_buf->data; 2285 2286 if (s->state == SSL3_ST_CW_CERT_VRFY_A) 2287 { 2288 p= ssl_handshake_start(s); 2289 pkey = s->cert->key->privatekey; 2290 2291 /* Write out the digest type if needbe. */ 2292 if (SSL_USE_SIGALGS(s)) 2293 { 2294 md = s->cert->key->digest; 2295 if (!tls12_get_sigandhash(p, pkey, md)) 2296 { 2297 OPENSSL_PUT_ERROR(SSL, ssl3_send_cert_verify, ERR_R_INTERNAL_ERROR); 2298 goto err; 2299 } 2300 p += 2; 2301 n += 2; 2302 } 2303 2304 /* Compute the digest. */ 2305 if (!ssl3_cert_verify_hash(s, digest, &digest_length, &md, pkey)) 2306 goto err; 2307 2308 /* The handshake buffer is no longer necessary. */ 2309 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s)) 2310 goto err; 2311 2312 /* Sign the digest. */ 2313 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2314 if (pctx == NULL) 2315 goto err; 2316 2317 /* Initialize the EVP_PKEY_CTX and determine the size of the signature. */ 2318 if (!EVP_PKEY_sign_init(pctx) || 2319 !EVP_PKEY_CTX_set_signature_md(pctx, md) || 2320 !EVP_PKEY_sign(pctx, NULL, &signature_length, 2321 digest, digest_length)) 2322 { 2323 OPENSSL_PUT_ERROR(SSL, ssl3_send_cert_verify, ERR_R_EVP_LIB); 2324 goto err; 2325 } 2326 2327 if (p + 2 + signature_length > buf + SSL3_RT_MAX_PLAIN_LENGTH) 2328 { 2329 OPENSSL_PUT_ERROR(SSL, ssl3_send_cert_verify, SSL_R_DATA_LENGTH_TOO_LONG); 2330 goto err; 2331 } 2332 2333 if (!EVP_PKEY_sign(pctx, &p[2], &signature_length, 2334 digest, digest_length)) 2335 { 2336 OPENSSL_PUT_ERROR(SSL, ssl3_send_cert_verify, ERR_R_EVP_LIB); 2337 goto err; 2338 } 2339 2340 s2n(signature_length, p); 2341 n += signature_length + 2; 2342 2343 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n); 2344 s->state=SSL3_ST_CW_CERT_VRFY_B; 2345 } 2346 EVP_PKEY_CTX_free(pctx); 2347 return ssl_do_write(s); 2348 err: 2349 EVP_PKEY_CTX_free(pctx); 2350 return(-1); 2351 } 2352 2353 /* Check a certificate can be used for client authentication. Currently 2354 * check the cert exists and if we have a suitable digest for TLS 1.2. 2355 */ 2356 static int ssl3_check_client_certificate(SSL *s) 2357 { 2358 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey) 2359 return 0; 2360 /* If no suitable signature algorithm can't use certificate */ 2361 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest) 2362 return 0; 2363 /* If strict mode check suitability of chain before using it. 2364 */ 2365 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT && 2366 !tls1_check_chain(s, NULL, NULL, NULL, -2)) 2367 return 0; 2368 return 1; 2369 } 2370 2371 int ssl3_send_client_certificate(SSL *s) 2372 { 2373 X509 *x509=NULL; 2374 EVP_PKEY *pkey=NULL; 2375 int i; 2376 2377 if (s->state == SSL3_ST_CW_CERT_A) 2378 { 2379 /* Let cert callback update client certificates if required */ 2380 if (s->cert->cert_cb) 2381 { 2382 i = s->cert->cert_cb(s, s->cert->cert_cb_arg); 2383 if (i < 0) 2384 { 2385 s->rwstate=SSL_X509_LOOKUP; 2386 return -1; 2387 } 2388 if (i == 0) 2389 { 2390 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR); 2391 return 0; 2392 } 2393 s->rwstate=SSL_NOTHING; 2394 } 2395 if (ssl3_check_client_certificate(s)) 2396 s->state=SSL3_ST_CW_CERT_C; 2397 else 2398 s->state=SSL3_ST_CW_CERT_B; 2399 } 2400 2401 /* We need to get a client cert */ 2402 if (s->state == SSL3_ST_CW_CERT_B) 2403 { 2404 /* If we get an error, we need to 2405 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2406 * We then get retried later */ 2407 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2408 if (i < 0) 2409 { 2410 s->rwstate=SSL_X509_LOOKUP; 2411 return(-1); 2412 } 2413 s->rwstate=SSL_NOTHING; 2414 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) 2415 { 2416 s->state=SSL3_ST_CW_CERT_B; 2417 if ( !SSL_use_certificate(s,x509) || 2418 !SSL_use_PrivateKey(s,pkey)) 2419 i=0; 2420 } 2421 else if (i == 1) 2422 { 2423 i=0; 2424 OPENSSL_PUT_ERROR(SSL, ssl3_send_client_certificate, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2425 } 2426 2427 if (x509 != NULL) X509_free(x509); 2428 if (pkey != NULL) EVP_PKEY_free(pkey); 2429 if (i && !ssl3_check_client_certificate(s)) 2430 i = 0; 2431 if (i == 0) 2432 { 2433 if (s->version == SSL3_VERSION) 2434 { 2435 s->s3->tmp.cert_req=0; 2436 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE); 2437 return(1); 2438 } 2439 else 2440 { 2441 s->s3->tmp.cert_req=2; 2442 } 2443 } 2444 2445 /* Ok, we have a cert */ 2446 s->state=SSL3_ST_CW_CERT_C; 2447 } 2448 2449 if (s->state == SSL3_ST_CW_CERT_C) 2450 { 2451 s->state=SSL3_ST_CW_CERT_D; 2452 ssl3_output_cert_chain(s, 2453 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key); 2454 } 2455 /* SSL3_ST_CW_CERT_D */ 2456 return ssl_do_write(s); 2457 } 2458 2459 #define has_bits(i,m) (((i)&(m)) == (m)) 2460 2461 int ssl3_check_cert_and_algorithm(SSL *s) 2462 { 2463 int i,idx; 2464 long alg_k,alg_a; 2465 EVP_PKEY *pkey=NULL; 2466 SESS_CERT *sc; 2467 RSA *rsa; 2468 DH *dh; 2469 2470 /* we don't have a certificate */ 2471 if (!ssl_cipher_has_server_public_key(s->s3->tmp.new_cipher)) 2472 return 1; 2473 2474 alg_k=s->s3->tmp.new_cipher->algorithm_mkey; 2475 alg_a=s->s3->tmp.new_cipher->algorithm_auth; 2476 2477 sc=s->session->sess_cert; 2478 if (sc == NULL) 2479 { 2480 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, ERR_R_INTERNAL_ERROR); 2481 goto err; 2482 } 2483 2484 rsa=s->session->sess_cert->peer_rsa_tmp; 2485 dh=s->session->sess_cert->peer_dh_tmp; 2486 2487 /* This is the passed certificate */ 2488 2489 idx=sc->peer_cert_type; 2490 if (idx == SSL_PKEY_ECC) 2491 { 2492 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, 2493 s) == 0) 2494 { /* check failed */ 2495 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, SSL_R_BAD_ECC_CERT); 2496 goto f_err; 2497 } 2498 else 2499 { 2500 return 1; 2501 } 2502 } 2503 else if (alg_a & SSL_aECDSA) 2504 { 2505 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, SSL_R_MISSING_ECDSA_SIGNING_CERT); 2506 goto f_err; 2507 } 2508 pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509); 2509 i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey); 2510 EVP_PKEY_free(pkey); 2511 2512 2513 /* Check that we have a certificate if we require one */ 2514 if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN)) 2515 { 2516 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, SSL_R_MISSING_RSA_SIGNING_CERT); 2517 goto f_err; 2518 } 2519 if ((alg_k & SSL_kRSA) && 2520 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL))) 2521 { 2522 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2523 goto f_err; 2524 } 2525 if ((alg_k & SSL_kEDH) && 2526 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) 2527 { 2528 OPENSSL_PUT_ERROR(SSL, ssl3_check_cert_and_algorithm, SSL_R_MISSING_DH_KEY); 2529 goto f_err; 2530 } 2531 2532 return(1); 2533 f_err: 2534 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 2535 err: 2536 return(0); 2537 } 2538 2539 int ssl3_send_next_proto(SSL *s) 2540 { 2541 unsigned int len, padding_len; 2542 unsigned char *d; 2543 2544 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) 2545 { 2546 len = s->next_proto_negotiated_len; 2547 padding_len = 32 - ((len + 2) % 32); 2548 d = (unsigned char *)s->init_buf->data; 2549 d[4] = len; 2550 memcpy(d + 5, s->next_proto_negotiated, len); 2551 d[5 + len] = padding_len; 2552 memset(d + 6 + len, 0, padding_len); 2553 *(d++)=SSL3_MT_NEXT_PROTO; 2554 l2n3(2 + len + padding_len, d); 2555 s->state = SSL3_ST_CW_NEXT_PROTO_B; 2556 s->init_num = 4 + 2 + len + padding_len; 2557 s->init_off = 0; 2558 } 2559 2560 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 2561 } 2562 2563 2564 int ssl3_send_channel_id(SSL *s) 2565 { 2566 unsigned char *d; 2567 int ret = -1, public_key_len; 2568 EVP_MD_CTX md_ctx; 2569 size_t sig_len; 2570 ECDSA_SIG *sig = NULL; 2571 unsigned char *public_key = NULL, *derp, *der_sig = NULL; 2572 2573 if (s->state != SSL3_ST_CW_CHANNEL_ID_A) 2574 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 2575 2576 if (!s->tlsext_channel_id_private && s->ctx->channel_id_cb) 2577 { 2578 EVP_PKEY *key = NULL; 2579 s->ctx->channel_id_cb(s, &key); 2580 if (key != NULL) 2581 { 2582 s->tlsext_channel_id_private = key; 2583 } 2584 } 2585 if (!s->tlsext_channel_id_private) 2586 { 2587 s->rwstate=SSL_CHANNEL_ID_LOOKUP; 2588 return (-1); 2589 } 2590 s->rwstate=SSL_NOTHING; 2591 2592 d = (unsigned char *)s->init_buf->data; 2593 *(d++)=SSL3_MT_ENCRYPTED_EXTENSIONS; 2594 l2n3(2 + 2 + TLSEXT_CHANNEL_ID_SIZE, d); 2595 if (s->s3->tlsext_channel_id_new) 2596 s2n(TLSEXT_TYPE_channel_id_new, d); 2597 else 2598 s2n(TLSEXT_TYPE_channel_id, d); 2599 s2n(TLSEXT_CHANNEL_ID_SIZE, d); 2600 2601 EVP_MD_CTX_init(&md_ctx); 2602 2603 public_key_len = i2d_PublicKey(s->tlsext_channel_id_private, NULL); 2604 if (public_key_len <= 0) 2605 { 2606 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_CANNOT_SERIALIZE_PUBLIC_KEY); 2607 goto err; 2608 } 2609 /* i2d_PublicKey will produce an ANSI X9.62 public key which, for a 2610 * P-256 key, is 0x04 (meaning uncompressed) followed by the x and y 2611 * field elements as 32-byte, big-endian numbers. */ 2612 if (public_key_len != 65) 2613 { 2614 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_CHANNEL_ID_NOT_P256); 2615 goto err; 2616 } 2617 public_key = OPENSSL_malloc(public_key_len); 2618 if (!public_key) 2619 { 2620 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, ERR_R_MALLOC_FAILURE); 2621 goto err; 2622 } 2623 2624 derp = public_key; 2625 i2d_PublicKey(s->tlsext_channel_id_private, &derp); 2626 2627 if (EVP_DigestSignInit(&md_ctx, NULL, EVP_sha256(), NULL, 2628 s->tlsext_channel_id_private) != 1) 2629 { 2630 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNINIT_FAILED); 2631 goto err; 2632 } 2633 2634 if (!tls1_channel_id_hash(&md_ctx, s)) 2635 goto err; 2636 2637 if (!EVP_DigestSignFinal(&md_ctx, NULL, &sig_len)) 2638 { 2639 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNFINAL_FAILED); 2640 goto err; 2641 } 2642 2643 der_sig = OPENSSL_malloc(sig_len); 2644 if (!der_sig) 2645 { 2646 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, ERR_R_MALLOC_FAILURE); 2647 goto err; 2648 } 2649 2650 if (!EVP_DigestSignFinal(&md_ctx, der_sig, &sig_len)) 2651 { 2652 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_EVP_DIGESTSIGNFINAL_FAILED); 2653 goto err; 2654 } 2655 2656 derp = der_sig; 2657 sig = d2i_ECDSA_SIG(NULL, (const unsigned char**) &derp, sig_len); 2658 if (sig == NULL) 2659 { 2660 OPENSSL_PUT_ERROR(SSL, ssl3_send_channel_id, SSL_R_D2I_ECDSA_SIG); 2661 goto err; 2662 } 2663 2664 /* The first byte of public_key will be 0x4, denoting an uncompressed key. */ 2665 memcpy(d, public_key + 1, 64); 2666 d += 64; 2667 memset(d, 0, 2 * 32); 2668 BN_bn2bin(sig->r, d + 32 - BN_num_bytes(sig->r)); 2669 d += 32; 2670 BN_bn2bin(sig->s, d + 32 - BN_num_bytes(sig->s)); 2671 d += 32; 2672 2673 s->state = SSL3_ST_CW_CHANNEL_ID_B; 2674 s->init_num = 4 + 2 + 2 + TLSEXT_CHANNEL_ID_SIZE; 2675 s->init_off = 0; 2676 2677 ret = ssl3_do_write(s, SSL3_RT_HANDSHAKE); 2678 2679 err: 2680 EVP_MD_CTX_cleanup(&md_ctx); 2681 if (public_key) 2682 OPENSSL_free(public_key); 2683 if (der_sig) 2684 OPENSSL_free(der_sig); 2685 if (sig) 2686 ECDSA_SIG_free(sig); 2687 2688 return ret; 2689 } 2690 2691 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2692 { 2693 int i = 0; 2694 if (s->ctx->client_cert_cb) 2695 i = s->ctx->client_cert_cb(s,px509,ppkey); 2696 return i; 2697 } 2698
