1 /* ssl/t1_lib.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 #include <stdio.h> 113 #include <openssl/objects.h> 114 #include <openssl/evp.h> 115 #include <openssl/hmac.h> 116 #include <openssl/ocsp.h> 117 #include "ssl_locl.h" 118 119 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; 120 121 #ifndef OPENSSL_NO_TLSEXT 122 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, 123 const unsigned char *sess_id, int sesslen, 124 SSL_SESSION **psess); 125 #endif 126 127 SSL3_ENC_METHOD TLSv1_enc_data={ 128 tls1_enc, 129 tls1_mac, 130 tls1_setup_key_block, 131 tls1_generate_master_secret, 132 tls1_change_cipher_state, 133 tls1_final_finish_mac, 134 TLS1_FINISH_MAC_LENGTH, 135 tls1_cert_verify_mac, 136 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, 137 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, 138 tls1_alert_code, 139 }; 140 141 long tls1_default_timeout(void) 142 { 143 /* 2 hours, the 24 hours mentioned in the TLSv1 spec 144 * is way too long for http, the cache would over fill */ 145 return(60*60*2); 146 } 147 148 int tls1_new(SSL *s) 149 { 150 if (!ssl3_new(s)) return(0); 151 s->method->ssl_clear(s); 152 return(1); 153 } 154 155 void tls1_free(SSL *s) 156 { 157 #ifndef OPENSSL_NO_TLSEXT 158 if (s->tlsext_session_ticket) 159 { 160 OPENSSL_free(s->tlsext_session_ticket); 161 } 162 #endif /* OPENSSL_NO_TLSEXT */ 163 ssl3_free(s); 164 } 165 166 void tls1_clear(SSL *s) 167 { 168 ssl3_clear(s); 169 s->version=TLS1_VERSION; 170 } 171 172 #ifndef OPENSSL_NO_EC 173 static int nid_list[] = 174 { 175 NID_sect163k1, /* sect163k1 (1) */ 176 NID_sect163r1, /* sect163r1 (2) */ 177 NID_sect163r2, /* sect163r2 (3) */ 178 NID_sect193r1, /* sect193r1 (4) */ 179 NID_sect193r2, /* sect193r2 (5) */ 180 NID_sect233k1, /* sect233k1 (6) */ 181 NID_sect233r1, /* sect233r1 (7) */ 182 NID_sect239k1, /* sect239k1 (8) */ 183 NID_sect283k1, /* sect283k1 (9) */ 184 NID_sect283r1, /* sect283r1 (10) */ 185 NID_sect409k1, /* sect409k1 (11) */ 186 NID_sect409r1, /* sect409r1 (12) */ 187 NID_sect571k1, /* sect571k1 (13) */ 188 NID_sect571r1, /* sect571r1 (14) */ 189 NID_secp160k1, /* secp160k1 (15) */ 190 NID_secp160r1, /* secp160r1 (16) */ 191 NID_secp160r2, /* secp160r2 (17) */ 192 NID_secp192k1, /* secp192k1 (18) */ 193 NID_X9_62_prime192v1, /* secp192r1 (19) */ 194 NID_secp224k1, /* secp224k1 (20) */ 195 NID_secp224r1, /* secp224r1 (21) */ 196 NID_secp256k1, /* secp256k1 (22) */ 197 NID_X9_62_prime256v1, /* secp256r1 (23) */ 198 NID_secp384r1, /* secp384r1 (24) */ 199 NID_secp521r1 /* secp521r1 (25) */ 200 }; 201 202 int tls1_ec_curve_id2nid(int curve_id) 203 { 204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 205 if ((curve_id < 1) || ((unsigned int)curve_id > 206 sizeof(nid_list)/sizeof(nid_list[0]))) 207 return 0; 208 return nid_list[curve_id-1]; 209 } 210 211 int tls1_ec_nid2curve_id(int nid) 212 { 213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 214 switch (nid) 215 { 216 case NID_sect163k1: /* sect163k1 (1) */ 217 return 1; 218 case NID_sect163r1: /* sect163r1 (2) */ 219 return 2; 220 case NID_sect163r2: /* sect163r2 (3) */ 221 return 3; 222 case NID_sect193r1: /* sect193r1 (4) */ 223 return 4; 224 case NID_sect193r2: /* sect193r2 (5) */ 225 return 5; 226 case NID_sect233k1: /* sect233k1 (6) */ 227 return 6; 228 case NID_sect233r1: /* sect233r1 (7) */ 229 return 7; 230 case NID_sect239k1: /* sect239k1 (8) */ 231 return 8; 232 case NID_sect283k1: /* sect283k1 (9) */ 233 return 9; 234 case NID_sect283r1: /* sect283r1 (10) */ 235 return 10; 236 case NID_sect409k1: /* sect409k1 (11) */ 237 return 11; 238 case NID_sect409r1: /* sect409r1 (12) */ 239 return 12; 240 case NID_sect571k1: /* sect571k1 (13) */ 241 return 13; 242 case NID_sect571r1: /* sect571r1 (14) */ 243 return 14; 244 case NID_secp160k1: /* secp160k1 (15) */ 245 return 15; 246 case NID_secp160r1: /* secp160r1 (16) */ 247 return 16; 248 case NID_secp160r2: /* secp160r2 (17) */ 249 return 17; 250 case NID_secp192k1: /* secp192k1 (18) */ 251 return 18; 252 case NID_X9_62_prime192v1: /* secp192r1 (19) */ 253 return 19; 254 case NID_secp224k1: /* secp224k1 (20) */ 255 return 20; 256 case NID_secp224r1: /* secp224r1 (21) */ 257 return 21; 258 case NID_secp256k1: /* secp256k1 (22) */ 259 return 22; 260 case NID_X9_62_prime256v1: /* secp256r1 (23) */ 261 return 23; 262 case NID_secp384r1: /* secp384r1 (24) */ 263 return 24; 264 case NID_secp521r1: /* secp521r1 (25) */ 265 return 25; 266 default: 267 return 0; 268 } 269 } 270 #endif /* OPENSSL_NO_EC */ 271 272 #ifndef OPENSSL_NO_TLSEXT 273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 274 { 275 int extdatalen=0; 276 unsigned char *ret = p; 277 278 /* don't add extensions for SSLv3 unless doing secure renegotiation */ 279 if (s->client_version == SSL3_VERSION 280 && !s->s3->send_connection_binding) 281 return p; 282 283 ret+=2; 284 285 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 286 287 if (s->tlsext_hostname != NULL) 288 { 289 /* Add TLS extension servername to the Client Hello message */ 290 unsigned long size_str; 291 long lenmax; 292 293 /* check for enough space. 294 4 for the servername type and entension length 295 2 for servernamelist length 296 1 for the hostname type 297 2 for hostname length 298 + hostname length 299 */ 300 301 if ((lenmax = limit - ret - 9) < 0 302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 303 return NULL; 304 305 /* extension type and length */ 306 s2n(TLSEXT_TYPE_server_name,ret); 307 s2n(size_str+5,ret); 308 309 /* length of servername list */ 310 s2n(size_str+3,ret); 311 312 /* hostname type, length and hostname */ 313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; 314 s2n(size_str,ret); 315 memcpy(ret, s->tlsext_hostname, size_str); 316 ret+=size_str; 317 } 318 319 /* Add RI if renegotiating */ 320 if (s->new_session) 321 { 322 int el; 323 324 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) 325 { 326 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 327 return NULL; 328 } 329 330 if((limit - p - 4 - el) < 0) return NULL; 331 332 s2n(TLSEXT_TYPE_renegotiate,ret); 333 s2n(el,ret); 334 335 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) 336 { 337 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 338 return NULL; 339 } 340 341 ret += el; 342 } 343 344 #ifndef OPENSSL_NO_EC 345 if (s->tlsext_ecpointformatlist != NULL && 346 s->version != DTLS1_VERSION) 347 { 348 /* Add TLS extension ECPointFormats to the ClientHello message */ 349 long lenmax; 350 351 if ((lenmax = limit - ret - 5) < 0) return NULL; 352 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 353 if (s->tlsext_ecpointformatlist_length > 255) 354 { 355 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 356 return NULL; 357 } 358 359 s2n(TLSEXT_TYPE_ec_point_formats,ret); 360 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 361 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 362 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 363 ret+=s->tlsext_ecpointformatlist_length; 364 } 365 if (s->tlsext_ellipticcurvelist != NULL && 366 s->version != DTLS1_VERSION) 367 { 368 /* Add TLS extension EllipticCurves to the ClientHello message */ 369 long lenmax; 370 371 if ((lenmax = limit - ret - 6) < 0) return NULL; 372 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; 373 if (s->tlsext_ellipticcurvelist_length > 65532) 374 { 375 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 376 return NULL; 377 } 378 379 s2n(TLSEXT_TYPE_elliptic_curves,ret); 380 s2n(s->tlsext_ellipticcurvelist_length + 2, ret); 381 382 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for 383 * elliptic_curve_list, but the examples use two bytes. 384 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html 385 * resolves this to two bytes. 386 */ 387 s2n(s->tlsext_ellipticcurvelist_length, ret); 388 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 389 ret+=s->tlsext_ellipticcurvelist_length; 390 } 391 #endif /* OPENSSL_NO_EC */ 392 393 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) 394 { 395 int ticklen; 396 if (!s->new_session && s->session && s->session->tlsext_tick) 397 ticklen = s->session->tlsext_ticklen; 398 else if (s->session && s->tlsext_session_ticket && 399 s->tlsext_session_ticket->data) 400 { 401 ticklen = s->tlsext_session_ticket->length; 402 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 403 if (!s->session->tlsext_tick) 404 return NULL; 405 memcpy(s->session->tlsext_tick, 406 s->tlsext_session_ticket->data, 407 ticklen); 408 s->session->tlsext_ticklen = ticklen; 409 } 410 else 411 ticklen = 0; 412 if (ticklen == 0 && s->tlsext_session_ticket && 413 s->tlsext_session_ticket->data == NULL) 414 goto skip_ext; 415 /* Check for enough room 2 for extension type, 2 for len 416 * rest for ticket 417 */ 418 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; 419 s2n(TLSEXT_TYPE_session_ticket,ret); 420 s2n(ticklen,ret); 421 if (ticklen) 422 { 423 memcpy(ret, s->session->tlsext_tick, ticklen); 424 ret += ticklen; 425 } 426 } 427 skip_ext: 428 429 #ifdef TLSEXT_TYPE_opaque_prf_input 430 if (s->s3->client_opaque_prf_input != NULL && 431 s->version != DTLS1_VERSION) 432 { 433 size_t col = s->s3->client_opaque_prf_input_len; 434 435 if ((long)(limit - ret - 6 - col < 0)) 436 return NULL; 437 if (col > 0xFFFD) /* can't happen */ 438 return NULL; 439 440 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 441 s2n(col + 2, ret); 442 s2n(col, ret); 443 memcpy(ret, s->s3->client_opaque_prf_input, col); 444 ret += col; 445 } 446 #endif 447 448 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && 449 s->version != DTLS1_VERSION) 450 { 451 int i; 452 long extlen, idlen, itmp; 453 OCSP_RESPID *id; 454 455 idlen = 0; 456 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 457 { 458 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 459 itmp = i2d_OCSP_RESPID(id, NULL); 460 if (itmp <= 0) 461 return NULL; 462 idlen += itmp + 2; 463 } 464 465 if (s->tlsext_ocsp_exts) 466 { 467 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); 468 if (extlen < 0) 469 return NULL; 470 } 471 else 472 extlen = 0; 473 474 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; 475 s2n(TLSEXT_TYPE_status_request, ret); 476 if (extlen + idlen > 0xFFF0) 477 return NULL; 478 s2n(extlen + idlen + 5, ret); 479 *(ret++) = TLSEXT_STATUSTYPE_ocsp; 480 s2n(idlen, ret); 481 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 482 { 483 /* save position of id len */ 484 unsigned char *q = ret; 485 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 486 /* skip over id len */ 487 ret += 2; 488 itmp = i2d_OCSP_RESPID(id, &ret); 489 /* write id len */ 490 s2n(itmp, q); 491 } 492 s2n(extlen, ret); 493 if (extlen > 0) 494 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); 495 } 496 497 if ((extdatalen = ret-p-2)== 0) 498 return p; 499 500 s2n(extdatalen,p); 501 return ret; 502 } 503 504 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 505 { 506 int extdatalen=0; 507 unsigned char *ret = p; 508 509 /* don't add extensions for SSLv3, unless doing secure renegotiation */ 510 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) 511 return p; 512 513 ret+=2; 514 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 515 516 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) 517 { 518 if ((long)(limit - ret - 4) < 0) return NULL; 519 520 s2n(TLSEXT_TYPE_server_name,ret); 521 s2n(0,ret); 522 } 523 524 if(s->s3->send_connection_binding) 525 { 526 int el; 527 528 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) 529 { 530 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 531 return NULL; 532 } 533 534 if((limit - p - 4 - el) < 0) return NULL; 535 536 s2n(TLSEXT_TYPE_renegotiate,ret); 537 s2n(el,ret); 538 539 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) 540 { 541 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 542 return NULL; 543 } 544 545 ret += el; 546 } 547 548 #ifndef OPENSSL_NO_EC 549 if (s->tlsext_ecpointformatlist != NULL && 550 s->version != DTLS1_VERSION) 551 { 552 /* Add TLS extension ECPointFormats to the ServerHello message */ 553 long lenmax; 554 555 if ((lenmax = limit - ret - 5) < 0) return NULL; 556 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 557 if (s->tlsext_ecpointformatlist_length > 255) 558 { 559 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 560 return NULL; 561 } 562 563 s2n(TLSEXT_TYPE_ec_point_formats,ret); 564 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 565 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 566 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 567 ret+=s->tlsext_ecpointformatlist_length; 568 569 } 570 /* Currently the server should not respond with a SupportedCurves extension */ 571 #endif /* OPENSSL_NO_EC */ 572 573 if (s->tlsext_ticket_expected 574 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 575 { 576 if ((long)(limit - ret - 4) < 0) return NULL; 577 s2n(TLSEXT_TYPE_session_ticket,ret); 578 s2n(0,ret); 579 } 580 581 if (s->tlsext_status_expected) 582 { 583 if ((long)(limit - ret - 4) < 0) return NULL; 584 s2n(TLSEXT_TYPE_status_request,ret); 585 s2n(0,ret); 586 } 587 588 #ifdef TLSEXT_TYPE_opaque_prf_input 589 if (s->s3->server_opaque_prf_input != NULL && 590 s->version != DTLS1_VERSION) 591 { 592 size_t sol = s->s3->server_opaque_prf_input_len; 593 594 if ((long)(limit - ret - 6 - sol) < 0) 595 return NULL; 596 if (sol > 0xFFFD) /* can't happen */ 597 return NULL; 598 599 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 600 s2n(sol + 2, ret); 601 s2n(sol, ret); 602 memcpy(ret, s->s3->server_opaque_prf_input, sol); 603 ret += sol; 604 } 605 #endif 606 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 607 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) 608 { const unsigned char cryptopro_ext[36] = { 609 0xfd, 0xe8, /*65000*/ 610 0x00, 0x20, /*32 bytes length*/ 611 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 612 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 613 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 614 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; 615 if (limit-ret<36) return NULL; 616 memcpy(ret,cryptopro_ext,36); 617 ret+=36; 618 619 } 620 621 if ((extdatalen = ret-p-2)== 0) 622 return p; 623 624 s2n(extdatalen,p); 625 return ret; 626 } 627 628 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 629 { 630 unsigned short type; 631 unsigned short size; 632 unsigned short len; 633 unsigned char *data = *p; 634 int renegotiate_seen = 0; 635 636 s->servername_done = 0; 637 s->tlsext_status_type = -1; 638 639 if (data >= (d+n-2)) 640 goto ri_check; 641 n2s(data,len); 642 643 if (data > (d+n-len)) 644 goto ri_check; 645 646 while (data <= (d+n-4)) 647 { 648 n2s(data,type); 649 n2s(data,size); 650 651 if (data+size > (d+n)) 652 goto ri_check; 653 #if 0 654 fprintf(stderr,"Received extension type %d size %d\n",type,size); 655 #endif 656 if (s->tlsext_debug_cb) 657 s->tlsext_debug_cb(s, 0, type, data, size, 658 s->tlsext_debug_arg); 659 /* The servername extension is treated as follows: 660 661 - Only the hostname type is supported with a maximum length of 255. 662 - The servername is rejected if too long or if it contains zeros, 663 in which case an fatal alert is generated. 664 - The servername field is maintained together with the session cache. 665 - When a session is resumed, the servername call back invoked in order 666 to allow the application to position itself to the right context. 667 - The servername is acknowledged if it is new for a session or when 668 it is identical to a previously used for the same session. 669 Applications can control the behaviour. They can at any time 670 set a 'desirable' servername for a new SSL object. This can be the 671 case for example with HTTPS when a Host: header field is received and 672 a renegotiation is requested. In this case, a possible servername 673 presented in the new client hello is only acknowledged if it matches 674 the value of the Host: field. 675 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 676 if they provide for changing an explicit servername context for the session, 677 i.e. when the session has been established with a servername extension. 678 - On session reconnect, the servername extension may be absent. 679 680 */ 681 682 if (type == TLSEXT_TYPE_server_name) 683 { 684 unsigned char *sdata; 685 int servname_type; 686 int dsize; 687 688 if (size < 2) 689 { 690 *al = SSL_AD_DECODE_ERROR; 691 return 0; 692 } 693 n2s(data,dsize); 694 size -= 2; 695 if (dsize > size ) 696 { 697 *al = SSL_AD_DECODE_ERROR; 698 return 0; 699 } 700 701 sdata = data; 702 while (dsize > 3) 703 { 704 servname_type = *(sdata++); 705 n2s(sdata,len); 706 dsize -= 3; 707 708 if (len > dsize) 709 { 710 *al = SSL_AD_DECODE_ERROR; 711 return 0; 712 } 713 if (s->servername_done == 0) 714 switch (servname_type) 715 { 716 case TLSEXT_NAMETYPE_host_name: 717 if (s->session->tlsext_hostname == NULL) 718 { 719 if (len > TLSEXT_MAXLEN_host_name || 720 ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)) 721 { 722 *al = TLS1_AD_UNRECOGNIZED_NAME; 723 return 0; 724 } 725 memcpy(s->session->tlsext_hostname, sdata, len); 726 s->session->tlsext_hostname[len]='\0'; 727 if (strlen(s->session->tlsext_hostname) != len) { 728 OPENSSL_free(s->session->tlsext_hostname); 729 s->session->tlsext_hostname = NULL; 730 *al = TLS1_AD_UNRECOGNIZED_NAME; 731 return 0; 732 } 733 s->servername_done = 1; 734 735 } 736 else 737 s->servername_done = strlen(s->session->tlsext_hostname) == len 738 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; 739 740 break; 741 742 default: 743 break; 744 } 745 746 dsize -= len; 747 } 748 if (dsize != 0) 749 { 750 *al = SSL_AD_DECODE_ERROR; 751 return 0; 752 } 753 754 } 755 756 #ifndef OPENSSL_NO_EC 757 else if (type == TLSEXT_TYPE_ec_point_formats && 758 s->version != DTLS1_VERSION) 759 { 760 unsigned char *sdata = data; 761 int ecpointformatlist_length = *(sdata++); 762 763 if (ecpointformatlist_length != size - 1) 764 { 765 *al = TLS1_AD_DECODE_ERROR; 766 return 0; 767 } 768 s->session->tlsext_ecpointformatlist_length = 0; 769 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 770 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 771 { 772 *al = TLS1_AD_INTERNAL_ERROR; 773 return 0; 774 } 775 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 776 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 777 #if 0 778 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); 779 sdata = s->session->tlsext_ecpointformatlist; 780 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 781 fprintf(stderr,"%i ",*(sdata++)); 782 fprintf(stderr,"\n"); 783 #endif 784 } 785 else if (type == TLSEXT_TYPE_elliptic_curves && 786 s->version != DTLS1_VERSION) 787 { 788 unsigned char *sdata = data; 789 int ellipticcurvelist_length = (*(sdata++) << 8); 790 ellipticcurvelist_length += (*(sdata++)); 791 792 if (ellipticcurvelist_length != size - 2) 793 { 794 *al = TLS1_AD_DECODE_ERROR; 795 return 0; 796 } 797 s->session->tlsext_ellipticcurvelist_length = 0; 798 if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist); 799 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) 800 { 801 *al = TLS1_AD_INTERNAL_ERROR; 802 return 0; 803 } 804 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; 805 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); 806 #if 0 807 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); 808 sdata = s->session->tlsext_ellipticcurvelist; 809 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) 810 fprintf(stderr,"%i ",*(sdata++)); 811 fprintf(stderr,"\n"); 812 #endif 813 } 814 #endif /* OPENSSL_NO_EC */ 815 #ifdef TLSEXT_TYPE_opaque_prf_input 816 else if (type == TLSEXT_TYPE_opaque_prf_input && 817 s->version != DTLS1_VERSION) 818 { 819 unsigned char *sdata = data; 820 821 if (size < 2) 822 { 823 *al = SSL_AD_DECODE_ERROR; 824 return 0; 825 } 826 n2s(sdata, s->s3->client_opaque_prf_input_len); 827 if (s->s3->client_opaque_prf_input_len != size - 2) 828 { 829 *al = SSL_AD_DECODE_ERROR; 830 return 0; 831 } 832 833 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 834 OPENSSL_free(s->s3->client_opaque_prf_input); 835 if (s->s3->client_opaque_prf_input_len == 0) 836 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 837 else 838 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); 839 if (s->s3->client_opaque_prf_input == NULL) 840 { 841 *al = TLS1_AD_INTERNAL_ERROR; 842 return 0; 843 } 844 } 845 #endif 846 else if (type == TLSEXT_TYPE_session_ticket) 847 { 848 if (s->tls_session_ticket_ext_cb && 849 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 850 { 851 *al = TLS1_AD_INTERNAL_ERROR; 852 return 0; 853 } 854 } 855 else if (type == TLSEXT_TYPE_renegotiate) 856 { 857 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) 858 return 0; 859 renegotiate_seen = 1; 860 } 861 else if (type == TLSEXT_TYPE_status_request && 862 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) 863 { 864 865 if (size < 5) 866 { 867 *al = SSL_AD_DECODE_ERROR; 868 return 0; 869 } 870 871 s->tlsext_status_type = *data++; 872 size--; 873 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) 874 { 875 const unsigned char *sdata; 876 int dsize; 877 /* Read in responder_id_list */ 878 n2s(data,dsize); 879 size -= 2; 880 if (dsize > size ) 881 { 882 *al = SSL_AD_DECODE_ERROR; 883 return 0; 884 } 885 while (dsize > 0) 886 { 887 OCSP_RESPID *id; 888 int idsize; 889 if (dsize < 4) 890 { 891 *al = SSL_AD_DECODE_ERROR; 892 return 0; 893 } 894 n2s(data, idsize); 895 dsize -= 2 + idsize; 896 if (dsize < 0) 897 { 898 *al = SSL_AD_DECODE_ERROR; 899 return 0; 900 } 901 sdata = data; 902 data += idsize; 903 id = d2i_OCSP_RESPID(NULL, 904 &sdata, idsize); 905 if (!id) 906 { 907 *al = SSL_AD_DECODE_ERROR; 908 return 0; 909 } 910 if (data != sdata) 911 { 912 OCSP_RESPID_free(id); 913 *al = SSL_AD_DECODE_ERROR; 914 return 0; 915 } 916 if (!s->tlsext_ocsp_ids 917 && !(s->tlsext_ocsp_ids = 918 sk_OCSP_RESPID_new_null())) 919 { 920 OCSP_RESPID_free(id); 921 *al = SSL_AD_INTERNAL_ERROR; 922 return 0; 923 } 924 if (!sk_OCSP_RESPID_push( 925 s->tlsext_ocsp_ids, id)) 926 { 927 OCSP_RESPID_free(id); 928 *al = SSL_AD_INTERNAL_ERROR; 929 return 0; 930 } 931 } 932 933 /* Read in request_extensions */ 934 n2s(data,dsize); 935 size -= 2; 936 if (dsize > size) 937 { 938 *al = SSL_AD_DECODE_ERROR; 939 return 0; 940 } 941 sdata = data; 942 if (dsize > 0) 943 { 944 s->tlsext_ocsp_exts = 945 d2i_X509_EXTENSIONS(NULL, 946 &sdata, dsize); 947 if (!s->tlsext_ocsp_exts 948 || (data + dsize != sdata)) 949 { 950 *al = SSL_AD_DECODE_ERROR; 951 return 0; 952 } 953 } 954 } 955 /* We don't know what to do with any other type 956 * so ignore it. 957 */ 958 else 959 s->tlsext_status_type = -1; 960 } 961 962 /* session ticket processed earlier */ 963 data+=size; 964 } 965 966 *p = data; 967 968 ri_check: 969 970 /* Need RI if renegotiating */ 971 972 if (!renegotiate_seen && s->new_session && 973 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 974 { 975 *al = SSL_AD_HANDSHAKE_FAILURE; 976 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, 977 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 978 return 0; 979 } 980 981 return 1; 982 } 983 984 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 985 { 986 unsigned short type; 987 unsigned short size; 988 unsigned short len; 989 unsigned char *data = *p; 990 int tlsext_servername = 0; 991 int renegotiate_seen = 0; 992 993 if (data >= (d+n-2)) 994 goto ri_check; 995 996 n2s(data,len); 997 998 while(data <= (d+n-4)) 999 { 1000 n2s(data,type); 1001 n2s(data,size); 1002 1003 if (data+size > (d+n)) 1004 goto ri_check; 1005 1006 if (s->tlsext_debug_cb) 1007 s->tlsext_debug_cb(s, 1, type, data, size, 1008 s->tlsext_debug_arg); 1009 1010 if (type == TLSEXT_TYPE_server_name) 1011 { 1012 if (s->tlsext_hostname == NULL || size > 0) 1013 { 1014 *al = TLS1_AD_UNRECOGNIZED_NAME; 1015 return 0; 1016 } 1017 tlsext_servername = 1; 1018 } 1019 1020 #ifndef OPENSSL_NO_EC 1021 else if (type == TLSEXT_TYPE_ec_point_formats && 1022 s->version != DTLS1_VERSION) 1023 { 1024 unsigned char *sdata = data; 1025 int ecpointformatlist_length = *(sdata++); 1026 1027 if (ecpointformatlist_length != size - 1) 1028 { 1029 *al = TLS1_AD_DECODE_ERROR; 1030 return 0; 1031 } 1032 s->session->tlsext_ecpointformatlist_length = 0; 1033 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 1034 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 1035 { 1036 *al = TLS1_AD_INTERNAL_ERROR; 1037 return 0; 1038 } 1039 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 1040 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 1041 #if 0 1042 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); 1043 sdata = s->session->tlsext_ecpointformatlist; 1044 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1045 fprintf(stderr,"%i ",*(sdata++)); 1046 fprintf(stderr,"\n"); 1047 #endif 1048 } 1049 #endif /* OPENSSL_NO_EC */ 1050 1051 else if (type == TLSEXT_TYPE_session_ticket) 1052 { 1053 if (s->tls_session_ticket_ext_cb && 1054 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1055 { 1056 *al = TLS1_AD_INTERNAL_ERROR; 1057 return 0; 1058 } 1059 if ((SSL_get_options(s) & SSL_OP_NO_TICKET) 1060 || (size > 0)) 1061 { 1062 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1063 return 0; 1064 } 1065 s->tlsext_ticket_expected = 1; 1066 } 1067 #ifdef TLSEXT_TYPE_opaque_prf_input 1068 else if (type == TLSEXT_TYPE_opaque_prf_input && 1069 s->version != DTLS1_VERSION) 1070 { 1071 unsigned char *sdata = data; 1072 1073 if (size < 2) 1074 { 1075 *al = SSL_AD_DECODE_ERROR; 1076 return 0; 1077 } 1078 n2s(sdata, s->s3->server_opaque_prf_input_len); 1079 if (s->s3->server_opaque_prf_input_len != size - 2) 1080 { 1081 *al = SSL_AD_DECODE_ERROR; 1082 return 0; 1083 } 1084 1085 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1086 OPENSSL_free(s->s3->server_opaque_prf_input); 1087 if (s->s3->server_opaque_prf_input_len == 0) 1088 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1089 else 1090 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); 1091 1092 if (s->s3->server_opaque_prf_input == NULL) 1093 { 1094 *al = TLS1_AD_INTERNAL_ERROR; 1095 return 0; 1096 } 1097 } 1098 #endif 1099 else if (type == TLSEXT_TYPE_status_request && 1100 s->version != DTLS1_VERSION) 1101 { 1102 /* MUST be empty and only sent if we've requested 1103 * a status request message. 1104 */ 1105 if ((s->tlsext_status_type == -1) || (size > 0)) 1106 { 1107 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1108 return 0; 1109 } 1110 /* Set flag to expect CertificateStatus message */ 1111 s->tlsext_status_expected = 1; 1112 } 1113 else if (type == TLSEXT_TYPE_renegotiate) 1114 { 1115 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) 1116 return 0; 1117 renegotiate_seen = 1; 1118 } 1119 data+=size; 1120 } 1121 1122 if (data != d+n) 1123 { 1124 *al = SSL_AD_DECODE_ERROR; 1125 return 0; 1126 } 1127 1128 if (!s->hit && tlsext_servername == 1) 1129 { 1130 if (s->tlsext_hostname) 1131 { 1132 if (s->session->tlsext_hostname == NULL) 1133 { 1134 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 1135 if (!s->session->tlsext_hostname) 1136 { 1137 *al = SSL_AD_UNRECOGNIZED_NAME; 1138 return 0; 1139 } 1140 } 1141 else 1142 { 1143 *al = SSL_AD_DECODE_ERROR; 1144 return 0; 1145 } 1146 } 1147 } 1148 1149 *p = data; 1150 1151 ri_check: 1152 1153 /* Determine if we need to see RI. Strictly speaking if we want to 1154 * avoid an attack we should *always* see RI even on initial server 1155 * hello because the client doesn't see any renegotiation during an 1156 * attack. However this would mean we could not connect to any server 1157 * which doesn't support RI so for the immediate future tolerate RI 1158 * absence on initial connect only. 1159 */ 1160 if (!renegotiate_seen 1161 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) 1162 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1163 { 1164 *al = SSL_AD_HANDSHAKE_FAILURE; 1165 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, 1166 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1167 return 0; 1168 } 1169 1170 return 1; 1171 } 1172 1173 1174 int ssl_prepare_clienthello_tlsext(SSL *s) 1175 { 1176 #ifndef OPENSSL_NO_EC 1177 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 1178 * and elliptic curves we support. 1179 */ 1180 int using_ecc = 0; 1181 int i; 1182 unsigned char *j; 1183 unsigned long alg_k, alg_a; 1184 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); 1185 1186 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) 1187 { 1188 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); 1189 1190 alg_k = c->algorithm_mkey; 1191 alg_a = c->algorithm_auth; 1192 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) 1193 { 1194 using_ecc = 1; 1195 break; 1196 } 1197 } 1198 using_ecc = using_ecc && (s->version == TLS1_VERSION); 1199 if (using_ecc) 1200 { 1201 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1202 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1203 { 1204 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1205 return -1; 1206 } 1207 s->tlsext_ecpointformatlist_length = 3; 1208 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1209 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1210 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1211 1212 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ 1213 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); 1214 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2; 1215 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 1216 { 1217 s->tlsext_ellipticcurvelist_length = 0; 1218 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1219 return -1; 1220 } 1221 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <= 1222 sizeof(nid_list)/sizeof(nid_list[0]); i++) 1223 s2n(i,j); 1224 } 1225 #endif /* OPENSSL_NO_EC */ 1226 1227 #ifdef TLSEXT_TYPE_opaque_prf_input 1228 { 1229 int r = 1; 1230 1231 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1232 { 1233 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1234 if (!r) 1235 return -1; 1236 } 1237 1238 if (s->tlsext_opaque_prf_input != NULL) 1239 { 1240 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 1241 OPENSSL_free(s->s3->client_opaque_prf_input); 1242 1243 if (s->tlsext_opaque_prf_input_len == 0) 1244 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1245 else 1246 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1247 if (s->s3->client_opaque_prf_input == NULL) 1248 { 1249 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1250 return -1; 1251 } 1252 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1253 } 1254 1255 if (r == 2) 1256 /* at callback's request, insist on receiving an appropriate server opaque PRF input */ 1257 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1258 } 1259 #endif 1260 1261 return 1; 1262 } 1263 1264 int ssl_prepare_serverhello_tlsext(SSL *s) 1265 { 1266 #ifndef OPENSSL_NO_EC 1267 /* If we are server and using an ECC cipher suite, send the point formats we support 1268 * if the client sent us an ECPointsFormat extension. Note that the server is not 1269 * supposed to send an EllipticCurves extension. 1270 */ 1271 1272 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1273 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1274 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); 1275 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); 1276 1277 if (using_ecc) 1278 { 1279 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1280 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1281 { 1282 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1283 return -1; 1284 } 1285 s->tlsext_ecpointformatlist_length = 3; 1286 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1287 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1288 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1289 } 1290 #endif /* OPENSSL_NO_EC */ 1291 1292 return 1; 1293 } 1294 1295 int ssl_check_clienthello_tlsext(SSL *s) 1296 { 1297 int ret=SSL_TLSEXT_ERR_NOACK; 1298 int al = SSL_AD_UNRECOGNIZED_NAME; 1299 1300 #ifndef OPENSSL_NO_EC 1301 /* The handling of the ECPointFormats extension is done elsewhere, namely in 1302 * ssl3_choose_cipher in s3_lib.c. 1303 */ 1304 /* The handling of the EllipticCurves extension is done elsewhere, namely in 1305 * ssl3_choose_cipher in s3_lib.c. 1306 */ 1307 #endif 1308 1309 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1310 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1311 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1312 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1313 1314 /* If status request then ask callback what to do. 1315 * Note: this must be called after servername callbacks in case 1316 * the certificate has changed. 1317 */ 1318 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) 1319 { 1320 int r; 1321 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1322 switch (r) 1323 { 1324 /* We don't want to send a status request response */ 1325 case SSL_TLSEXT_ERR_NOACK: 1326 s->tlsext_status_expected = 0; 1327 break; 1328 /* status request response should be sent */ 1329 case SSL_TLSEXT_ERR_OK: 1330 if (s->tlsext_ocsp_resp) 1331 s->tlsext_status_expected = 1; 1332 else 1333 s->tlsext_status_expected = 0; 1334 break; 1335 /* something bad happened */ 1336 case SSL_TLSEXT_ERR_ALERT_FATAL: 1337 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1338 al = SSL_AD_INTERNAL_ERROR; 1339 goto err; 1340 } 1341 } 1342 else 1343 s->tlsext_status_expected = 0; 1344 1345 #ifdef TLSEXT_TYPE_opaque_prf_input 1346 { 1347 /* This sort of belongs into ssl_prepare_serverhello_tlsext(), 1348 * but we might be sending an alert in response to the client hello, 1349 * so this has to happen here in ssl_check_clienthello_tlsext(). */ 1350 1351 int r = 1; 1352 1353 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1354 { 1355 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1356 if (!r) 1357 { 1358 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1359 al = SSL_AD_INTERNAL_ERROR; 1360 goto err; 1361 } 1362 } 1363 1364 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1365 OPENSSL_free(s->s3->server_opaque_prf_input); 1366 s->s3->server_opaque_prf_input = NULL; 1367 1368 if (s->tlsext_opaque_prf_input != NULL) 1369 { 1370 if (s->s3->client_opaque_prf_input != NULL && 1371 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) 1372 { 1373 /* can only use this extension if we have a server opaque PRF input 1374 * of the same length as the client opaque PRF input! */ 1375 1376 if (s->tlsext_opaque_prf_input_len == 0) 1377 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1378 else 1379 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1380 if (s->s3->server_opaque_prf_input == NULL) 1381 { 1382 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1383 al = SSL_AD_INTERNAL_ERROR; 1384 goto err; 1385 } 1386 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1387 } 1388 } 1389 1390 if (r == 2 && s->s3->server_opaque_prf_input == NULL) 1391 { 1392 /* The callback wants to enforce use of the extension, 1393 * but we can't do that with the client opaque PRF input; 1394 * abort the handshake. 1395 */ 1396 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1397 al = SSL_AD_HANDSHAKE_FAILURE; 1398 } 1399 } 1400 1401 #endif 1402 err: 1403 switch (ret) 1404 { 1405 case SSL_TLSEXT_ERR_ALERT_FATAL: 1406 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1407 return -1; 1408 1409 case SSL_TLSEXT_ERR_ALERT_WARNING: 1410 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1411 return 1; 1412 1413 case SSL_TLSEXT_ERR_NOACK: 1414 s->servername_done=0; 1415 default: 1416 return 1; 1417 } 1418 } 1419 1420 int ssl_check_serverhello_tlsext(SSL *s) 1421 { 1422 int ret=SSL_TLSEXT_ERR_NOACK; 1423 int al = SSL_AD_UNRECOGNIZED_NAME; 1424 1425 #ifndef OPENSSL_NO_EC 1426 /* If we are client and using an elliptic curve cryptography cipher suite, then server 1427 * must return a an EC point formats lists containing uncompressed. 1428 */ 1429 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1430 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1431 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 1432 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) 1433 { 1434 /* we are using an ECC cipher */ 1435 size_t i; 1436 unsigned char *list; 1437 int found_uncompressed = 0; 1438 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0)) 1439 { 1440 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1441 return -1; 1442 } 1443 list = s->session->tlsext_ecpointformatlist; 1444 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1445 { 1446 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) 1447 { 1448 found_uncompressed = 1; 1449 break; 1450 } 1451 } 1452 if (!found_uncompressed) 1453 { 1454 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1455 return -1; 1456 } 1457 } 1458 ret = SSL_TLSEXT_ERR_OK; 1459 #endif /* OPENSSL_NO_EC */ 1460 1461 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1462 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1463 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1464 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1465 1466 #ifdef TLSEXT_TYPE_opaque_prf_input 1467 if (s->s3->server_opaque_prf_input_len > 0) 1468 { 1469 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. 1470 * So first verify that we really have a value from the server too. */ 1471 1472 if (s->s3->server_opaque_prf_input == NULL) 1473 { 1474 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1475 al = SSL_AD_HANDSHAKE_FAILURE; 1476 } 1477 1478 /* Anytime the server *has* sent an opaque PRF input, we need to check 1479 * that we have a client opaque PRF input of the same size. */ 1480 if (s->s3->client_opaque_prf_input == NULL || 1481 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) 1482 { 1483 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1484 al = SSL_AD_ILLEGAL_PARAMETER; 1485 } 1486 } 1487 #endif 1488 1489 /* If we've requested certificate status and we wont get one 1490 * tell the callback 1491 */ 1492 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) 1493 && s->ctx && s->ctx->tlsext_status_cb) 1494 { 1495 int r; 1496 /* Set resp to NULL, resplen to -1 so callback knows 1497 * there is no response. 1498 */ 1499 if (s->tlsext_ocsp_resp) 1500 { 1501 OPENSSL_free(s->tlsext_ocsp_resp); 1502 s->tlsext_ocsp_resp = NULL; 1503 } 1504 s->tlsext_ocsp_resplen = -1; 1505 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1506 if (r == 0) 1507 { 1508 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1509 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1510 } 1511 if (r < 0) 1512 { 1513 al = SSL_AD_INTERNAL_ERROR; 1514 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1515 } 1516 } 1517 1518 switch (ret) 1519 { 1520 case SSL_TLSEXT_ERR_ALERT_FATAL: 1521 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1522 return -1; 1523 1524 case SSL_TLSEXT_ERR_ALERT_WARNING: 1525 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1526 return 1; 1527 1528 case SSL_TLSEXT_ERR_NOACK: 1529 s->servername_done=0; 1530 default: 1531 return 1; 1532 } 1533 } 1534 1535 /* Since the server cache lookup is done early on in the processing of client 1536 * hello and other operations depend on the result we need to handle any TLS 1537 * session ticket extension at the same time. 1538 */ 1539 1540 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, 1541 const unsigned char *limit, SSL_SESSION **ret) 1542 { 1543 /* Point after session ID in client hello */ 1544 const unsigned char *p = session_id + len; 1545 unsigned short i; 1546 1547 /* If tickets disabled behave as if no ticket present 1548 * to permit stateful resumption. 1549 */ 1550 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1551 return 1; 1552 1553 if ((s->version <= SSL3_VERSION) || !limit) 1554 return 1; 1555 if (p >= limit) 1556 return -1; 1557 /* Skip past DTLS cookie */ 1558 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1559 { 1560 i = *(p++); 1561 p+= i; 1562 if (p >= limit) 1563 return -1; 1564 } 1565 /* Skip past cipher list */ 1566 n2s(p, i); 1567 p+= i; 1568 if (p >= limit) 1569 return -1; 1570 /* Skip past compression algorithm list */ 1571 i = *(p++); 1572 p += i; 1573 if (p > limit) 1574 return -1; 1575 /* Now at start of extensions */ 1576 if ((p + 2) >= limit) 1577 return 1; 1578 n2s(p, i); 1579 while ((p + 4) <= limit) 1580 { 1581 unsigned short type, size; 1582 n2s(p, type); 1583 n2s(p, size); 1584 if (p + size > limit) 1585 return 1; 1586 if (type == TLSEXT_TYPE_session_ticket) 1587 { 1588 /* If tickets disabled indicate cache miss which will 1589 * trigger a full handshake 1590 */ 1591 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1592 return 1; 1593 /* If zero length note client will accept a ticket 1594 * and indicate cache miss to trigger full handshake 1595 */ 1596 if (size == 0) 1597 { 1598 s->tlsext_ticket_expected = 1; 1599 return 0; /* Cache miss */ 1600 } 1601 if (s->tls_session_secret_cb) 1602 { 1603 /* Indicate cache miss here and instead of 1604 * generating the session from ticket now, 1605 * trigger abbreviated handshake based on 1606 * external mechanism to calculate the master 1607 * secret later. */ 1608 return 0; 1609 } 1610 return tls_decrypt_ticket(s, p, size, session_id, len, 1611 ret); 1612 } 1613 p += size; 1614 } 1615 return 1; 1616 } 1617 1618 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1619 const unsigned char *sess_id, int sesslen, 1620 SSL_SESSION **psess) 1621 { 1622 SSL_SESSION *sess; 1623 unsigned char *sdec; 1624 const unsigned char *p; 1625 int slen, mlen, renew_ticket = 0; 1626 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1627 HMAC_CTX hctx; 1628 EVP_CIPHER_CTX ctx; 1629 SSL_CTX *tctx = s->initial_ctx; 1630 /* Need at least keyname + iv + some encrypted data */ 1631 if (eticklen < 48) 1632 goto tickerr; 1633 /* Initialize session ticket encryption and HMAC contexts */ 1634 HMAC_CTX_init(&hctx); 1635 EVP_CIPHER_CTX_init(&ctx); 1636 if (tctx->tlsext_ticket_key_cb) 1637 { 1638 unsigned char *nctick = (unsigned char *)etick; 1639 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, 1640 &ctx, &hctx, 0); 1641 if (rv < 0) 1642 return -1; 1643 if (rv == 0) 1644 goto tickerr; 1645 if (rv == 2) 1646 renew_ticket = 1; 1647 } 1648 else 1649 { 1650 /* Check key name matches */ 1651 if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) 1652 goto tickerr; 1653 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1654 tlsext_tick_md(), NULL); 1655 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1656 tctx->tlsext_tick_aes_key, etick + 16); 1657 } 1658 /* Attempt to process session ticket, first conduct sanity and 1659 * integrity checks on ticket. 1660 */ 1661 mlen = HMAC_size(&hctx); 1662 if (mlen < 0) 1663 { 1664 EVP_CIPHER_CTX_cleanup(&ctx); 1665 return -1; 1666 } 1667 eticklen -= mlen; 1668 /* Check HMAC of encrypted ticket */ 1669 HMAC_Update(&hctx, etick, eticklen); 1670 HMAC_Final(&hctx, tick_hmac, NULL); 1671 HMAC_CTX_cleanup(&hctx); 1672 if (memcmp(tick_hmac, etick + eticklen, mlen)) 1673 goto tickerr; 1674 /* Attempt to decrypt session data */ 1675 /* Move p after IV to start of encrypted ticket, update length */ 1676 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1677 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1678 sdec = OPENSSL_malloc(eticklen); 1679 if (!sdec) 1680 { 1681 EVP_CIPHER_CTX_cleanup(&ctx); 1682 return -1; 1683 } 1684 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); 1685 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) 1686 goto tickerr; 1687 slen += mlen; 1688 EVP_CIPHER_CTX_cleanup(&ctx); 1689 p = sdec; 1690 1691 sess = d2i_SSL_SESSION(NULL, &p, slen); 1692 OPENSSL_free(sdec); 1693 if (sess) 1694 { 1695 /* The session ID if non-empty is used by some clients to 1696 * detect that the ticket has been accepted. So we copy it to 1697 * the session structure. If it is empty set length to zero 1698 * as required by standard. 1699 */ 1700 if (sesslen) 1701 memcpy(sess->session_id, sess_id, sesslen); 1702 sess->session_id_length = sesslen; 1703 *psess = sess; 1704 s->tlsext_ticket_expected = renew_ticket; 1705 return 1; 1706 } 1707 /* If session decrypt failure indicate a cache miss and set state to 1708 * send a new ticket 1709 */ 1710 tickerr: 1711 s->tlsext_ticket_expected = 1; 1712 return 0; 1713 } 1714 1715 #endif 1716
