1 /* ssl/t1_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@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@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@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@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@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@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@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 = s->method->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 the renegotiation option: TODOEKR switch */ 320 { 321 int el; 322 323 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) 324 { 325 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 326 return NULL; 327 } 328 329 if((limit - p - 4 - el) < 0) return NULL; 330 331 s2n(TLSEXT_TYPE_renegotiate,ret); 332 s2n(el,ret); 333 334 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) 335 { 336 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 337 return NULL; 338 } 339 340 ret += el; 341 } 342 343 #ifndef OPENSSL_NO_EC 344 if (s->tlsext_ecpointformatlist != NULL && 345 s->version != DTLS1_VERSION) 346 { 347 /* Add TLS extension ECPointFormats to the ClientHello message */ 348 long lenmax; 349 350 if ((lenmax = limit - ret - 5) < 0) return NULL; 351 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 352 if (s->tlsext_ecpointformatlist_length > 255) 353 { 354 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 355 return NULL; 356 } 357 358 s2n(TLSEXT_TYPE_ec_point_formats,ret); 359 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 360 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 361 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 362 ret+=s->tlsext_ecpointformatlist_length; 363 } 364 if (s->tlsext_ellipticcurvelist != NULL && 365 s->version != DTLS1_VERSION) 366 { 367 /* Add TLS extension EllipticCurves to the ClientHello message */ 368 long lenmax; 369 370 if ((lenmax = limit - ret - 6) < 0) return NULL; 371 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; 372 if (s->tlsext_ellipticcurvelist_length > 65532) 373 { 374 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 375 return NULL; 376 } 377 378 s2n(TLSEXT_TYPE_elliptic_curves,ret); 379 s2n(s->tlsext_ellipticcurvelist_length + 2, ret); 380 381 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for 382 * elliptic_curve_list, but the examples use two bytes. 383 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html 384 * resolves this to two bytes. 385 */ 386 s2n(s->tlsext_ellipticcurvelist_length, ret); 387 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 388 ret+=s->tlsext_ellipticcurvelist_length; 389 } 390 #endif /* OPENSSL_NO_EC */ 391 392 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) 393 { 394 int ticklen; 395 if (!s->new_session && s->session && s->session->tlsext_tick) 396 ticklen = s->session->tlsext_ticklen; 397 else if (s->session && s->tlsext_session_ticket && 398 s->tlsext_session_ticket->data) 399 { 400 ticklen = s->tlsext_session_ticket->length; 401 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 402 if (!s->session->tlsext_tick) 403 return NULL; 404 memcpy(s->session->tlsext_tick, 405 s->tlsext_session_ticket->data, 406 ticklen); 407 s->session->tlsext_ticklen = ticklen; 408 } 409 else 410 ticklen = 0; 411 if (ticklen == 0 && s->tlsext_session_ticket && 412 s->tlsext_session_ticket->data == NULL) 413 goto skip_ext; 414 /* Check for enough room 2 for extension type, 2 for len 415 * rest for ticket 416 */ 417 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; 418 s2n(TLSEXT_TYPE_session_ticket,ret); 419 s2n(ticklen,ret); 420 if (ticklen) 421 { 422 memcpy(ret, s->session->tlsext_tick, ticklen); 423 ret += ticklen; 424 } 425 } 426 skip_ext: 427 428 #ifdef TLSEXT_TYPE_opaque_prf_input 429 if (s->s3->client_opaque_prf_input != NULL && 430 s->version != DTLS1_VERSION) 431 { 432 size_t col = s->s3->client_opaque_prf_input_len; 433 434 if ((long)(limit - ret - 6 - col < 0)) 435 return NULL; 436 if (col > 0xFFFD) /* can't happen */ 437 return NULL; 438 439 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 440 s2n(col + 2, ret); 441 s2n(col, ret); 442 memcpy(ret, s->s3->client_opaque_prf_input, col); 443 ret += col; 444 } 445 #endif 446 447 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && 448 s->version != DTLS1_VERSION) 449 { 450 int i; 451 long extlen, idlen, itmp; 452 OCSP_RESPID *id; 453 454 idlen = 0; 455 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 456 { 457 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 458 itmp = i2d_OCSP_RESPID(id, NULL); 459 if (itmp <= 0) 460 return NULL; 461 idlen += itmp + 2; 462 } 463 464 if (s->tlsext_ocsp_exts) 465 { 466 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); 467 if (extlen < 0) 468 return NULL; 469 } 470 else 471 extlen = 0; 472 473 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; 474 s2n(TLSEXT_TYPE_status_request, ret); 475 if (extlen + idlen > 0xFFF0) 476 return NULL; 477 s2n(extlen + idlen + 5, ret); 478 *(ret++) = TLSEXT_STATUSTYPE_ocsp; 479 s2n(idlen, ret); 480 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 481 { 482 /* save position of id len */ 483 unsigned char *q = ret; 484 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 485 /* skip over id len */ 486 ret += 2; 487 itmp = i2d_OCSP_RESPID(id, &ret); 488 /* write id len */ 489 s2n(itmp, q); 490 } 491 s2n(extlen, ret); 492 if (extlen > 0) 493 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); 494 } 495 496 if ((extdatalen = ret-p-2)== 0) 497 return p; 498 499 s2n(extdatalen,p); 500 return ret; 501 } 502 503 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 504 { 505 int extdatalen=0; 506 unsigned char *ret = p; 507 508 /* don't add extensions for SSLv3, unless doing secure renegotiation */ 509 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) 510 return p; 511 512 ret+=2; 513 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 514 515 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) 516 { 517 if ((long)(limit - ret - 4) < 0) return NULL; 518 519 s2n(TLSEXT_TYPE_server_name,ret); 520 s2n(0,ret); 521 } 522 523 if(s->s3->send_connection_binding) 524 { 525 int el; 526 527 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) 528 { 529 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 530 return NULL; 531 } 532 533 if((limit - p - 4 - el) < 0) return NULL; 534 535 s2n(TLSEXT_TYPE_renegotiate,ret); 536 s2n(el,ret); 537 538 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) 539 { 540 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 541 return NULL; 542 } 543 544 ret += el; 545 } 546 547 #ifndef OPENSSL_NO_EC 548 if (s->tlsext_ecpointformatlist != NULL && 549 s->version != DTLS1_VERSION) 550 { 551 /* Add TLS extension ECPointFormats to the ServerHello message */ 552 long lenmax; 553 554 if ((lenmax = limit - ret - 5) < 0) return NULL; 555 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 556 if (s->tlsext_ecpointformatlist_length > 255) 557 { 558 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 559 return NULL; 560 } 561 562 s2n(TLSEXT_TYPE_ec_point_formats,ret); 563 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 564 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 565 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 566 ret+=s->tlsext_ecpointformatlist_length; 567 568 } 569 /* Currently the server should not respond with a SupportedCurves extension */ 570 #endif /* OPENSSL_NO_EC */ 571 572 if (s->tlsext_ticket_expected 573 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 574 { 575 if ((long)(limit - ret - 4) < 0) return NULL; 576 s2n(TLSEXT_TYPE_session_ticket,ret); 577 s2n(0,ret); 578 } 579 580 if (s->tlsext_status_expected) 581 { 582 if ((long)(limit - ret - 4) < 0) return NULL; 583 s2n(TLSEXT_TYPE_status_request,ret); 584 s2n(0,ret); 585 } 586 587 #ifdef TLSEXT_TYPE_opaque_prf_input 588 if (s->s3->server_opaque_prf_input != NULL && 589 s->version != DTLS1_VERSION) 590 { 591 size_t sol = s->s3->server_opaque_prf_input_len; 592 593 if ((long)(limit - ret - 6 - sol) < 0) 594 return NULL; 595 if (sol > 0xFFFD) /* can't happen */ 596 return NULL; 597 598 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 599 s2n(sol + 2, ret); 600 s2n(sol, ret); 601 memcpy(ret, s->s3->server_opaque_prf_input, sol); 602 ret += sol; 603 } 604 #endif 605 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 606 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) 607 { const unsigned char cryptopro_ext[36] = { 608 0xfd, 0xe8, /*65000*/ 609 0x00, 0x20, /*32 bytes length*/ 610 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 611 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 612 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 613 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; 614 if (limit-ret<36) return NULL; 615 memcpy(ret,cryptopro_ext,36); 616 ret+=36; 617 618 } 619 620 if ((extdatalen = ret-p-2)== 0) 621 return p; 622 623 s2n(extdatalen,p); 624 return ret; 625 } 626 627 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 628 { 629 unsigned short type; 630 unsigned short size; 631 unsigned short len; 632 unsigned char *data = *p; 633 int renegotiate_seen = 0; 634 635 s->servername_done = 0; 636 s->tlsext_status_type = -1; 637 638 if (data >= (d+n-2)) 639 goto ri_check; 640 n2s(data,len); 641 642 if (data > (d+n-len)) 643 goto ri_check; 644 645 while (data <= (d+n-4)) 646 { 647 n2s(data,type); 648 n2s(data,size); 649 650 if (data+size > (d+n)) 651 goto ri_check; 652 #if 0 653 fprintf(stderr,"Received extension type %d size %d\n",type,size); 654 #endif 655 if (s->tlsext_debug_cb) 656 s->tlsext_debug_cb(s, 0, type, data, size, 657 s->tlsext_debug_arg); 658 /* The servername extension is treated as follows: 659 660 - Only the hostname type is supported with a maximum length of 255. 661 - The servername is rejected if too long or if it contains zeros, 662 in which case an fatal alert is generated. 663 - The servername field is maintained together with the session cache. 664 - When a session is resumed, the servername call back invoked in order 665 to allow the application to position itself to the right context. 666 - The servername is acknowledged if it is new for a session or when 667 it is identical to a previously used for the same session. 668 Applications can control the behaviour. They can at any time 669 set a 'desirable' servername for a new SSL object. This can be the 670 case for example with HTTPS when a Host: header field is received and 671 a renegotiation is requested. In this case, a possible servername 672 presented in the new client hello is only acknowledged if it matches 673 the value of the Host: field. 674 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 675 if they provide for changing an explicit servername context for the session, 676 i.e. when the session has been established with a servername extension. 677 - On session reconnect, the servername extension may be absent. 678 679 */ 680 681 if (type == TLSEXT_TYPE_server_name) 682 { 683 unsigned char *sdata; 684 int servname_type; 685 int dsize; 686 687 if (size < 2) 688 { 689 *al = SSL_AD_DECODE_ERROR; 690 return 0; 691 } 692 n2s(data,dsize); 693 size -= 2; 694 if (dsize > size ) 695 { 696 *al = SSL_AD_DECODE_ERROR; 697 return 0; 698 } 699 700 sdata = data; 701 while (dsize > 3) 702 { 703 servname_type = *(sdata++); 704 n2s(sdata,len); 705 dsize -= 3; 706 707 if (len > dsize) 708 { 709 *al = SSL_AD_DECODE_ERROR; 710 return 0; 711 } 712 if (s->servername_done == 0) 713 switch (servname_type) 714 { 715 case TLSEXT_NAMETYPE_host_name: 716 if (!s->hit) 717 { 718 if(s->session->tlsext_hostname) 719 { 720 *al = SSL_AD_DECODE_ERROR; 721 return 0; 722 } 723 if (len > TLSEXT_MAXLEN_host_name) 724 { 725 *al = TLS1_AD_UNRECOGNIZED_NAME; 726 return 0; 727 } 728 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) 729 { 730 *al = TLS1_AD_INTERNAL_ERROR; 731 return 0; 732 } 733 memcpy(s->session->tlsext_hostname, sdata, len); 734 s->session->tlsext_hostname[len]='\0'; 735 if (strlen(s->session->tlsext_hostname) != len) { 736 OPENSSL_free(s->session->tlsext_hostname); 737 s->session->tlsext_hostname = NULL; 738 *al = TLS1_AD_UNRECOGNIZED_NAME; 739 return 0; 740 } 741 s->servername_done = 1; 742 743 } 744 else 745 s->servername_done = s->session->tlsext_hostname 746 && strlen(s->session->tlsext_hostname) == len 747 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; 748 749 break; 750 751 default: 752 break; 753 } 754 755 dsize -= len; 756 } 757 if (dsize != 0) 758 { 759 *al = SSL_AD_DECODE_ERROR; 760 return 0; 761 } 762 763 } 764 765 #ifndef OPENSSL_NO_EC 766 else if (type == TLSEXT_TYPE_ec_point_formats && 767 s->version != DTLS1_VERSION) 768 { 769 unsigned char *sdata = data; 770 int ecpointformatlist_length = *(sdata++); 771 772 if (ecpointformatlist_length != size - 1) 773 { 774 *al = TLS1_AD_DECODE_ERROR; 775 return 0; 776 } 777 if (!s->hit) 778 { 779 if(s->session->tlsext_ecpointformatlist) 780 { 781 OPENSSL_free(s->session->tlsext_ecpointformatlist); 782 s->session->tlsext_ecpointformatlist = NULL; 783 } 784 s->session->tlsext_ecpointformatlist_length = 0; 785 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 786 { 787 *al = TLS1_AD_INTERNAL_ERROR; 788 return 0; 789 } 790 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 791 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 792 } 793 #if 0 794 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); 795 sdata = s->session->tlsext_ecpointformatlist; 796 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 797 fprintf(stderr,"%i ",*(sdata++)); 798 fprintf(stderr,"\n"); 799 #endif 800 } 801 else if (type == TLSEXT_TYPE_elliptic_curves && 802 s->version != DTLS1_VERSION) 803 { 804 unsigned char *sdata = data; 805 int ellipticcurvelist_length = (*(sdata++) << 8); 806 ellipticcurvelist_length += (*(sdata++)); 807 808 if (ellipticcurvelist_length != size - 2) 809 { 810 *al = TLS1_AD_DECODE_ERROR; 811 return 0; 812 } 813 if (!s->hit) 814 { 815 if(s->session->tlsext_ellipticcurvelist) 816 { 817 *al = TLS1_AD_DECODE_ERROR; 818 return 0; 819 } 820 s->session->tlsext_ellipticcurvelist_length = 0; 821 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) 822 { 823 *al = TLS1_AD_INTERNAL_ERROR; 824 return 0; 825 } 826 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; 827 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); 828 } 829 #if 0 830 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); 831 sdata = s->session->tlsext_ellipticcurvelist; 832 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) 833 fprintf(stderr,"%i ",*(sdata++)); 834 fprintf(stderr,"\n"); 835 #endif 836 } 837 #endif /* OPENSSL_NO_EC */ 838 #ifdef TLSEXT_TYPE_opaque_prf_input 839 else if (type == TLSEXT_TYPE_opaque_prf_input && 840 s->version != DTLS1_VERSION) 841 { 842 unsigned char *sdata = data; 843 844 if (size < 2) 845 { 846 *al = SSL_AD_DECODE_ERROR; 847 return 0; 848 } 849 n2s(sdata, s->s3->client_opaque_prf_input_len); 850 if (s->s3->client_opaque_prf_input_len != size - 2) 851 { 852 *al = SSL_AD_DECODE_ERROR; 853 return 0; 854 } 855 856 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 857 OPENSSL_free(s->s3->client_opaque_prf_input); 858 if (s->s3->client_opaque_prf_input_len == 0) 859 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 860 else 861 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); 862 if (s->s3->client_opaque_prf_input == NULL) 863 { 864 *al = TLS1_AD_INTERNAL_ERROR; 865 return 0; 866 } 867 } 868 #endif 869 else if (type == TLSEXT_TYPE_session_ticket) 870 { 871 if (s->tls_session_ticket_ext_cb && 872 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 873 { 874 *al = TLS1_AD_INTERNAL_ERROR; 875 return 0; 876 } 877 } 878 else if (type == TLSEXT_TYPE_renegotiate) 879 { 880 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) 881 return 0; 882 renegotiate_seen = 1; 883 } 884 else if (type == TLSEXT_TYPE_status_request && 885 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) 886 { 887 888 if (size < 5) 889 { 890 *al = SSL_AD_DECODE_ERROR; 891 return 0; 892 } 893 894 s->tlsext_status_type = *data++; 895 size--; 896 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) 897 { 898 const unsigned char *sdata; 899 int dsize; 900 /* Read in responder_id_list */ 901 n2s(data,dsize); 902 size -= 2; 903 if (dsize > size ) 904 { 905 *al = SSL_AD_DECODE_ERROR; 906 return 0; 907 } 908 while (dsize > 0) 909 { 910 OCSP_RESPID *id; 911 int idsize; 912 if (dsize < 4) 913 { 914 *al = SSL_AD_DECODE_ERROR; 915 return 0; 916 } 917 n2s(data, idsize); 918 dsize -= 2 + idsize; 919 size -= 2 + idsize; 920 if (dsize < 0) 921 { 922 *al = SSL_AD_DECODE_ERROR; 923 return 0; 924 } 925 sdata = data; 926 data += idsize; 927 id = d2i_OCSP_RESPID(NULL, 928 &sdata, idsize); 929 if (!id) 930 { 931 *al = SSL_AD_DECODE_ERROR; 932 return 0; 933 } 934 if (data != sdata) 935 { 936 OCSP_RESPID_free(id); 937 *al = SSL_AD_DECODE_ERROR; 938 return 0; 939 } 940 if (!s->tlsext_ocsp_ids 941 && !(s->tlsext_ocsp_ids = 942 sk_OCSP_RESPID_new_null())) 943 { 944 OCSP_RESPID_free(id); 945 *al = SSL_AD_INTERNAL_ERROR; 946 return 0; 947 } 948 if (!sk_OCSP_RESPID_push( 949 s->tlsext_ocsp_ids, id)) 950 { 951 OCSP_RESPID_free(id); 952 *al = SSL_AD_INTERNAL_ERROR; 953 return 0; 954 } 955 } 956 957 /* Read in request_extensions */ 958 if (size < 2) 959 { 960 *al = SSL_AD_DECODE_ERROR; 961 return 0; 962 } 963 n2s(data,dsize); 964 size -= 2; 965 if (dsize != size) 966 { 967 *al = SSL_AD_DECODE_ERROR; 968 return 0; 969 } 970 sdata = data; 971 if (dsize > 0) 972 { 973 s->tlsext_ocsp_exts = 974 d2i_X509_EXTENSIONS(NULL, 975 &sdata, dsize); 976 if (!s->tlsext_ocsp_exts 977 || (data + dsize != sdata)) 978 { 979 *al = SSL_AD_DECODE_ERROR; 980 return 0; 981 } 982 } 983 } 984 /* We don't know what to do with any other type 985 * so ignore it. 986 */ 987 else 988 s->tlsext_status_type = -1; 989 } 990 991 /* session ticket processed earlier */ 992 data+=size; 993 } 994 995 *p = data; 996 997 ri_check: 998 999 /* Need RI if renegotiating */ 1000 1001 if (!renegotiate_seen && s->new_session && 1002 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1003 { 1004 *al = SSL_AD_HANDSHAKE_FAILURE; 1005 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, 1006 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1007 return 0; 1008 } 1009 1010 return 1; 1011 } 1012 1013 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 1014 { 1015 unsigned short type; 1016 unsigned short size; 1017 unsigned short len; 1018 unsigned char *data = *p; 1019 int tlsext_servername = 0; 1020 int renegotiate_seen = 0; 1021 1022 if (data >= (d+n-2)) 1023 goto ri_check; 1024 1025 n2s(data,len); 1026 1027 while(data <= (d+n-4)) 1028 { 1029 n2s(data,type); 1030 n2s(data,size); 1031 1032 if (data+size > (d+n)) 1033 goto ri_check; 1034 1035 if (s->tlsext_debug_cb) 1036 s->tlsext_debug_cb(s, 1, type, data, size, 1037 s->tlsext_debug_arg); 1038 1039 if (type == TLSEXT_TYPE_server_name) 1040 { 1041 if (s->tlsext_hostname == NULL || size > 0) 1042 { 1043 *al = TLS1_AD_UNRECOGNIZED_NAME; 1044 return 0; 1045 } 1046 tlsext_servername = 1; 1047 } 1048 1049 #ifndef OPENSSL_NO_EC 1050 else if (type == TLSEXT_TYPE_ec_point_formats && 1051 s->version != DTLS1_VERSION) 1052 { 1053 unsigned char *sdata = data; 1054 int ecpointformatlist_length = *(sdata++); 1055 1056 if (ecpointformatlist_length != size - 1) 1057 { 1058 *al = TLS1_AD_DECODE_ERROR; 1059 return 0; 1060 } 1061 s->session->tlsext_ecpointformatlist_length = 0; 1062 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 1063 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 1064 { 1065 *al = TLS1_AD_INTERNAL_ERROR; 1066 return 0; 1067 } 1068 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 1069 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 1070 #if 0 1071 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); 1072 sdata = s->session->tlsext_ecpointformatlist; 1073 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1074 fprintf(stderr,"%i ",*(sdata++)); 1075 fprintf(stderr,"\n"); 1076 #endif 1077 } 1078 #endif /* OPENSSL_NO_EC */ 1079 1080 else if (type == TLSEXT_TYPE_session_ticket) 1081 { 1082 if (s->tls_session_ticket_ext_cb && 1083 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1084 { 1085 *al = TLS1_AD_INTERNAL_ERROR; 1086 return 0; 1087 } 1088 if ((SSL_get_options(s) & SSL_OP_NO_TICKET) 1089 || (size > 0)) 1090 { 1091 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1092 return 0; 1093 } 1094 s->tlsext_ticket_expected = 1; 1095 } 1096 #ifdef TLSEXT_TYPE_opaque_prf_input 1097 else if (type == TLSEXT_TYPE_opaque_prf_input && 1098 s->version != DTLS1_VERSION) 1099 { 1100 unsigned char *sdata = data; 1101 1102 if (size < 2) 1103 { 1104 *al = SSL_AD_DECODE_ERROR; 1105 return 0; 1106 } 1107 n2s(sdata, s->s3->server_opaque_prf_input_len); 1108 if (s->s3->server_opaque_prf_input_len != size - 2) 1109 { 1110 *al = SSL_AD_DECODE_ERROR; 1111 return 0; 1112 } 1113 1114 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1115 OPENSSL_free(s->s3->server_opaque_prf_input); 1116 if (s->s3->server_opaque_prf_input_len == 0) 1117 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1118 else 1119 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); 1120 1121 if (s->s3->server_opaque_prf_input == NULL) 1122 { 1123 *al = TLS1_AD_INTERNAL_ERROR; 1124 return 0; 1125 } 1126 } 1127 #endif 1128 else if (type == TLSEXT_TYPE_status_request && 1129 s->version != DTLS1_VERSION) 1130 { 1131 /* MUST be empty and only sent if we've requested 1132 * a status request message. 1133 */ 1134 if ((s->tlsext_status_type == -1) || (size > 0)) 1135 { 1136 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1137 return 0; 1138 } 1139 /* Set flag to expect CertificateStatus message */ 1140 s->tlsext_status_expected = 1; 1141 } 1142 else if (type == TLSEXT_TYPE_renegotiate) 1143 { 1144 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) 1145 return 0; 1146 renegotiate_seen = 1; 1147 } 1148 data+=size; 1149 } 1150 1151 if (data != d+n) 1152 { 1153 *al = SSL_AD_DECODE_ERROR; 1154 return 0; 1155 } 1156 1157 if (!s->hit && tlsext_servername == 1) 1158 { 1159 if (s->tlsext_hostname) 1160 { 1161 if (s->session->tlsext_hostname == NULL) 1162 { 1163 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 1164 if (!s->session->tlsext_hostname) 1165 { 1166 *al = SSL_AD_UNRECOGNIZED_NAME; 1167 return 0; 1168 } 1169 } 1170 else 1171 { 1172 *al = SSL_AD_DECODE_ERROR; 1173 return 0; 1174 } 1175 } 1176 } 1177 1178 *p = data; 1179 1180 ri_check: 1181 1182 /* Determine if we need to see RI. Strictly speaking if we want to 1183 * avoid an attack we should *always* see RI even on initial server 1184 * hello because the client doesn't see any renegotiation during an 1185 * attack. However this would mean we could not connect to any server 1186 * which doesn't support RI so for the immediate future tolerate RI 1187 * absence on initial connect only. 1188 */ 1189 if (!renegotiate_seen && 1190 (s->new_session || !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)) 1191 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1192 { 1193 *al = SSL_AD_HANDSHAKE_FAILURE; 1194 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, 1195 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1196 return 0; 1197 } 1198 1199 return 1; 1200 } 1201 1202 1203 int ssl_prepare_clienthello_tlsext(SSL *s) 1204 { 1205 #ifndef OPENSSL_NO_EC 1206 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 1207 * and elliptic curves we support. 1208 */ 1209 int using_ecc = 0; 1210 int i; 1211 unsigned char *j; 1212 unsigned long alg_k, alg_a; 1213 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); 1214 1215 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) 1216 { 1217 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); 1218 1219 alg_k = c->algorithm_mkey; 1220 alg_a = c->algorithm_auth; 1221 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) 1222 { 1223 using_ecc = 1; 1224 break; 1225 } 1226 } 1227 using_ecc = using_ecc && (s->version == TLS1_VERSION); 1228 if (using_ecc) 1229 { 1230 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1231 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1232 { 1233 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1234 return -1; 1235 } 1236 s->tlsext_ecpointformatlist_length = 3; 1237 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1238 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1239 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1240 1241 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ 1242 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); 1243 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2; 1244 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 1245 { 1246 s->tlsext_ellipticcurvelist_length = 0; 1247 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1248 return -1; 1249 } 1250 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <= 1251 sizeof(nid_list)/sizeof(nid_list[0]); i++) 1252 s2n(i,j); 1253 } 1254 #endif /* OPENSSL_NO_EC */ 1255 1256 #ifdef TLSEXT_TYPE_opaque_prf_input 1257 { 1258 int r = 1; 1259 1260 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1261 { 1262 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1263 if (!r) 1264 return -1; 1265 } 1266 1267 if (s->tlsext_opaque_prf_input != NULL) 1268 { 1269 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 1270 OPENSSL_free(s->s3->client_opaque_prf_input); 1271 1272 if (s->tlsext_opaque_prf_input_len == 0) 1273 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1274 else 1275 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1276 if (s->s3->client_opaque_prf_input == NULL) 1277 { 1278 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1279 return -1; 1280 } 1281 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1282 } 1283 1284 if (r == 2) 1285 /* at callback's request, insist on receiving an appropriate server opaque PRF input */ 1286 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1287 } 1288 #endif 1289 1290 return 1; 1291 } 1292 1293 int ssl_prepare_serverhello_tlsext(SSL *s) 1294 { 1295 #ifndef OPENSSL_NO_EC 1296 /* If we are server and using an ECC cipher suite, send the point formats we support 1297 * if the client sent us an ECPointsFormat extension. Note that the server is not 1298 * supposed to send an EllipticCurves extension. 1299 */ 1300 1301 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1302 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1303 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); 1304 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); 1305 1306 if (using_ecc) 1307 { 1308 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1309 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1310 { 1311 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1312 return -1; 1313 } 1314 s->tlsext_ecpointformatlist_length = 3; 1315 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1316 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1317 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1318 } 1319 #endif /* OPENSSL_NO_EC */ 1320 1321 return 1; 1322 } 1323 1324 int ssl_check_clienthello_tlsext(SSL *s) 1325 { 1326 int ret=SSL_TLSEXT_ERR_NOACK; 1327 int al = SSL_AD_UNRECOGNIZED_NAME; 1328 1329 #ifndef OPENSSL_NO_EC 1330 /* The handling of the ECPointFormats extension is done elsewhere, namely in 1331 * ssl3_choose_cipher in s3_lib.c. 1332 */ 1333 /* The handling of the EllipticCurves extension is done elsewhere, namely in 1334 * ssl3_choose_cipher in s3_lib.c. 1335 */ 1336 #endif 1337 1338 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1339 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1340 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1341 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1342 1343 /* If status request then ask callback what to do. 1344 * Note: this must be called after servername callbacks in case 1345 * the certificate has changed. 1346 */ 1347 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) 1348 { 1349 int r; 1350 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1351 switch (r) 1352 { 1353 /* We don't want to send a status request response */ 1354 case SSL_TLSEXT_ERR_NOACK: 1355 s->tlsext_status_expected = 0; 1356 break; 1357 /* status request response should be sent */ 1358 case SSL_TLSEXT_ERR_OK: 1359 if (s->tlsext_ocsp_resp) 1360 s->tlsext_status_expected = 1; 1361 else 1362 s->tlsext_status_expected = 0; 1363 break; 1364 /* something bad happened */ 1365 case SSL_TLSEXT_ERR_ALERT_FATAL: 1366 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1367 al = SSL_AD_INTERNAL_ERROR; 1368 goto err; 1369 } 1370 } 1371 else 1372 s->tlsext_status_expected = 0; 1373 1374 #ifdef TLSEXT_TYPE_opaque_prf_input 1375 { 1376 /* This sort of belongs into ssl_prepare_serverhello_tlsext(), 1377 * but we might be sending an alert in response to the client hello, 1378 * so this has to happen here in ssl_check_clienthello_tlsext(). */ 1379 1380 int r = 1; 1381 1382 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1383 { 1384 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1385 if (!r) 1386 { 1387 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1388 al = SSL_AD_INTERNAL_ERROR; 1389 goto err; 1390 } 1391 } 1392 1393 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1394 OPENSSL_free(s->s3->server_opaque_prf_input); 1395 s->s3->server_opaque_prf_input = NULL; 1396 1397 if (s->tlsext_opaque_prf_input != NULL) 1398 { 1399 if (s->s3->client_opaque_prf_input != NULL && 1400 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) 1401 { 1402 /* can only use this extension if we have a server opaque PRF input 1403 * of the same length as the client opaque PRF input! */ 1404 1405 if (s->tlsext_opaque_prf_input_len == 0) 1406 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1407 else 1408 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1409 if (s->s3->server_opaque_prf_input == NULL) 1410 { 1411 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1412 al = SSL_AD_INTERNAL_ERROR; 1413 goto err; 1414 } 1415 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1416 } 1417 } 1418 1419 if (r == 2 && s->s3->server_opaque_prf_input == NULL) 1420 { 1421 /* The callback wants to enforce use of the extension, 1422 * but we can't do that with the client opaque PRF input; 1423 * abort the handshake. 1424 */ 1425 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1426 al = SSL_AD_HANDSHAKE_FAILURE; 1427 } 1428 } 1429 1430 #endif 1431 err: 1432 switch (ret) 1433 { 1434 case SSL_TLSEXT_ERR_ALERT_FATAL: 1435 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1436 return -1; 1437 1438 case SSL_TLSEXT_ERR_ALERT_WARNING: 1439 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1440 return 1; 1441 1442 case SSL_TLSEXT_ERR_NOACK: 1443 s->servername_done=0; 1444 default: 1445 return 1; 1446 } 1447 } 1448 1449 int ssl_check_serverhello_tlsext(SSL *s) 1450 { 1451 int ret=SSL_TLSEXT_ERR_NOACK; 1452 int al = SSL_AD_UNRECOGNIZED_NAME; 1453 1454 #ifndef OPENSSL_NO_EC 1455 /* If we are client and using an elliptic curve cryptography cipher suite, then server 1456 * must return a an EC point formats lists containing uncompressed. 1457 */ 1458 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1459 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1460 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 1461 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) 1462 { 1463 /* we are using an ECC cipher */ 1464 size_t i; 1465 unsigned char *list; 1466 int found_uncompressed = 0; 1467 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0)) 1468 { 1469 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1470 return -1; 1471 } 1472 list = s->session->tlsext_ecpointformatlist; 1473 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1474 { 1475 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) 1476 { 1477 found_uncompressed = 1; 1478 break; 1479 } 1480 } 1481 if (!found_uncompressed) 1482 { 1483 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1484 return -1; 1485 } 1486 } 1487 ret = SSL_TLSEXT_ERR_OK; 1488 #endif /* OPENSSL_NO_EC */ 1489 1490 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1491 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1492 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1493 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1494 1495 #ifdef TLSEXT_TYPE_opaque_prf_input 1496 if (s->s3->server_opaque_prf_input_len > 0) 1497 { 1498 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. 1499 * So first verify that we really have a value from the server too. */ 1500 1501 if (s->s3->server_opaque_prf_input == NULL) 1502 { 1503 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1504 al = SSL_AD_HANDSHAKE_FAILURE; 1505 } 1506 1507 /* Anytime the server *has* sent an opaque PRF input, we need to check 1508 * that we have a client opaque PRF input of the same size. */ 1509 if (s->s3->client_opaque_prf_input == NULL || 1510 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) 1511 { 1512 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1513 al = SSL_AD_ILLEGAL_PARAMETER; 1514 } 1515 } 1516 #endif 1517 1518 /* If we've requested certificate status and we wont get one 1519 * tell the callback 1520 */ 1521 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) 1522 && s->ctx && s->ctx->tlsext_status_cb) 1523 { 1524 int r; 1525 /* Set resp to NULL, resplen to -1 so callback knows 1526 * there is no response. 1527 */ 1528 if (s->tlsext_ocsp_resp) 1529 { 1530 OPENSSL_free(s->tlsext_ocsp_resp); 1531 s->tlsext_ocsp_resp = NULL; 1532 } 1533 s->tlsext_ocsp_resplen = -1; 1534 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1535 if (r == 0) 1536 { 1537 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1538 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1539 } 1540 if (r < 0) 1541 { 1542 al = SSL_AD_INTERNAL_ERROR; 1543 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1544 } 1545 } 1546 1547 switch (ret) 1548 { 1549 case SSL_TLSEXT_ERR_ALERT_FATAL: 1550 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1551 return -1; 1552 1553 case SSL_TLSEXT_ERR_ALERT_WARNING: 1554 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1555 return 1; 1556 1557 case SSL_TLSEXT_ERR_NOACK: 1558 s->servername_done=0; 1559 default: 1560 return 1; 1561 } 1562 } 1563 1564 /* Since the server cache lookup is done early on in the processing of client 1565 * hello and other operations depend on the result we need to handle any TLS 1566 * session ticket extension at the same time. 1567 */ 1568 1569 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, 1570 const unsigned char *limit, SSL_SESSION **ret) 1571 { 1572 /* Point after session ID in client hello */ 1573 const unsigned char *p = session_id + len; 1574 unsigned short i; 1575 1576 /* If tickets disabled behave as if no ticket present 1577 * to permit stateful resumption. 1578 */ 1579 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1580 return 1; 1581 1582 if ((s->version <= SSL3_VERSION) || !limit) 1583 return 1; 1584 if (p >= limit) 1585 return -1; 1586 /* Skip past DTLS cookie */ 1587 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1588 { 1589 i = *(p++); 1590 p+= i; 1591 if (p >= limit) 1592 return -1; 1593 } 1594 /* Skip past cipher list */ 1595 n2s(p, i); 1596 p+= i; 1597 if (p >= limit) 1598 return -1; 1599 /* Skip past compression algorithm list */ 1600 i = *(p++); 1601 p += i; 1602 if (p > limit) 1603 return -1; 1604 /* Now at start of extensions */ 1605 if ((p + 2) >= limit) 1606 return 1; 1607 n2s(p, i); 1608 while ((p + 4) <= limit) 1609 { 1610 unsigned short type, size; 1611 n2s(p, type); 1612 n2s(p, size); 1613 if (p + size > limit) 1614 return 1; 1615 if (type == TLSEXT_TYPE_session_ticket) 1616 { 1617 /* If tickets disabled indicate cache miss which will 1618 * trigger a full handshake 1619 */ 1620 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1621 return 1; 1622 /* If zero length note client will accept a ticket 1623 * and indicate cache miss to trigger full handshake 1624 */ 1625 if (size == 0) 1626 { 1627 s->tlsext_ticket_expected = 1; 1628 return 0; /* Cache miss */ 1629 } 1630 if (s->tls_session_secret_cb) 1631 { 1632 /* Indicate cache miss here and instead of 1633 * generating the session from ticket now, 1634 * trigger abbreviated handshake based on 1635 * external mechanism to calculate the master 1636 * secret later. */ 1637 return 0; 1638 } 1639 return tls_decrypt_ticket(s, p, size, session_id, len, 1640 ret); 1641 } 1642 p += size; 1643 } 1644 return 1; 1645 } 1646 1647 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1648 const unsigned char *sess_id, int sesslen, 1649 SSL_SESSION **psess) 1650 { 1651 SSL_SESSION *sess; 1652 unsigned char *sdec; 1653 const unsigned char *p; 1654 int slen, mlen, renew_ticket = 0; 1655 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1656 HMAC_CTX hctx; 1657 EVP_CIPHER_CTX ctx; 1658 SSL_CTX *tctx = s->initial_ctx; 1659 /* Need at least keyname + iv + some encrypted data */ 1660 if (eticklen < 48) 1661 goto tickerr; 1662 /* Initialize session ticket encryption and HMAC contexts */ 1663 HMAC_CTX_init(&hctx); 1664 EVP_CIPHER_CTX_init(&ctx); 1665 if (tctx->tlsext_ticket_key_cb) 1666 { 1667 unsigned char *nctick = (unsigned char *)etick; 1668 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, 1669 &ctx, &hctx, 0); 1670 if (rv < 0) 1671 return -1; 1672 if (rv == 0) 1673 goto tickerr; 1674 if (rv == 2) 1675 renew_ticket = 1; 1676 } 1677 else 1678 { 1679 /* Check key name matches */ 1680 if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) 1681 goto tickerr; 1682 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1683 tlsext_tick_md(), NULL); 1684 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1685 tctx->tlsext_tick_aes_key, etick + 16); 1686 } 1687 /* Attempt to process session ticket, first conduct sanity and 1688 * integrity checks on ticket. 1689 */ 1690 mlen = HMAC_size(&hctx); 1691 if (mlen < 0) 1692 { 1693 EVP_CIPHER_CTX_cleanup(&ctx); 1694 return -1; 1695 } 1696 eticklen -= mlen; 1697 /* Check HMAC of encrypted ticket */ 1698 HMAC_Update(&hctx, etick, eticklen); 1699 HMAC_Final(&hctx, tick_hmac, NULL); 1700 HMAC_CTX_cleanup(&hctx); 1701 if (memcmp(tick_hmac, etick + eticklen, mlen)) 1702 goto tickerr; 1703 /* Attempt to decrypt session data */ 1704 /* Move p after IV to start of encrypted ticket, update length */ 1705 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1706 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1707 sdec = OPENSSL_malloc(eticklen); 1708 if (!sdec) 1709 { 1710 EVP_CIPHER_CTX_cleanup(&ctx); 1711 return -1; 1712 } 1713 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); 1714 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) 1715 goto tickerr; 1716 slen += mlen; 1717 EVP_CIPHER_CTX_cleanup(&ctx); 1718 p = sdec; 1719 1720 sess = d2i_SSL_SESSION(NULL, &p, slen); 1721 OPENSSL_free(sdec); 1722 if (sess) 1723 { 1724 /* The session ID if non-empty is used by some clients to 1725 * detect that the ticket has been accepted. So we copy it to 1726 * the session structure. If it is empty set length to zero 1727 * as required by standard. 1728 */ 1729 if (sesslen) 1730 memcpy(sess->session_id, sess_id, sesslen); 1731 sess->session_id_length = sesslen; 1732 *psess = sess; 1733 s->tlsext_ticket_expected = renew_ticket; 1734 return 1; 1735 } 1736 /* If session decrypt failure indicate a cache miss and set state to 1737 * send a new ticket 1738 */ 1739 tickerr: 1740 s->tlsext_ticket_expected = 1; 1741 return 0; 1742 } 1743 1744 #endif 1745