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 173 174 static int nid_list[] = 175 { 176 NID_sect163k1, /* sect163k1 (1) */ 177 NID_sect163r1, /* sect163r1 (2) */ 178 NID_sect163r2, /* sect163r2 (3) */ 179 NID_sect193r1, /* sect193r1 (4) */ 180 NID_sect193r2, /* sect193r2 (5) */ 181 NID_sect233k1, /* sect233k1 (6) */ 182 NID_sect233r1, /* sect233r1 (7) */ 183 NID_sect239k1, /* sect239k1 (8) */ 184 NID_sect283k1, /* sect283k1 (9) */ 185 NID_sect283r1, /* sect283r1 (10) */ 186 NID_sect409k1, /* sect409k1 (11) */ 187 NID_sect409r1, /* sect409r1 (12) */ 188 NID_sect571k1, /* sect571k1 (13) */ 189 NID_sect571r1, /* sect571r1 (14) */ 190 NID_secp160k1, /* secp160k1 (15) */ 191 NID_secp160r1, /* secp160r1 (16) */ 192 NID_secp160r2, /* secp160r2 (17) */ 193 NID_secp192k1, /* secp192k1 (18) */ 194 NID_X9_62_prime192v1, /* secp192r1 (19) */ 195 NID_secp224k1, /* secp224k1 (20) */ 196 NID_secp224r1, /* secp224r1 (21) */ 197 NID_secp256k1, /* secp256k1 (22) */ 198 NID_X9_62_prime256v1, /* secp256r1 (23) */ 199 NID_secp384r1, /* secp384r1 (24) */ 200 NID_secp521r1 /* secp521r1 (25) */ 201 }; 202 203 static int pref_list[] = 204 { 205 NID_sect571r1, /* sect571r1 (14) */ 206 NID_sect571k1, /* sect571k1 (13) */ 207 NID_secp521r1, /* secp521r1 (25) */ 208 NID_sect409k1, /* sect409k1 (11) */ 209 NID_sect409r1, /* sect409r1 (12) */ 210 NID_secp384r1, /* secp384r1 (24) */ 211 NID_sect283k1, /* sect283k1 (9) */ 212 NID_sect283r1, /* sect283r1 (10) */ 213 NID_secp256k1, /* secp256k1 (22) */ 214 NID_X9_62_prime256v1, /* secp256r1 (23) */ 215 NID_sect239k1, /* sect239k1 (8) */ 216 NID_sect233k1, /* sect233k1 (6) */ 217 NID_sect233r1, /* sect233r1 (7) */ 218 NID_secp224k1, /* secp224k1 (20) */ 219 NID_secp224r1, /* secp224r1 (21) */ 220 NID_sect193r1, /* sect193r1 (4) */ 221 NID_sect193r2, /* sect193r2 (5) */ 222 NID_secp192k1, /* secp192k1 (18) */ 223 NID_X9_62_prime192v1, /* secp192r1 (19) */ 224 NID_sect163k1, /* sect163k1 (1) */ 225 NID_sect163r1, /* sect163r1 (2) */ 226 NID_sect163r2, /* sect163r2 (3) */ 227 NID_secp160k1, /* secp160k1 (15) */ 228 NID_secp160r1, /* secp160r1 (16) */ 229 NID_secp160r2, /* secp160r2 (17) */ 230 }; 231 232 int tls1_ec_curve_id2nid(int curve_id) 233 { 234 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 235 if ((curve_id < 1) || ((unsigned int)curve_id > 236 sizeof(nid_list)/sizeof(nid_list[0]))) 237 return 0; 238 return nid_list[curve_id-1]; 239 } 240 241 int tls1_ec_nid2curve_id(int nid) 242 { 243 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 244 switch (nid) 245 { 246 case NID_sect163k1: /* sect163k1 (1) */ 247 return 1; 248 case NID_sect163r1: /* sect163r1 (2) */ 249 return 2; 250 case NID_sect163r2: /* sect163r2 (3) */ 251 return 3; 252 case NID_sect193r1: /* sect193r1 (4) */ 253 return 4; 254 case NID_sect193r2: /* sect193r2 (5) */ 255 return 5; 256 case NID_sect233k1: /* sect233k1 (6) */ 257 return 6; 258 case NID_sect233r1: /* sect233r1 (7) */ 259 return 7; 260 case NID_sect239k1: /* sect239k1 (8) */ 261 return 8; 262 case NID_sect283k1: /* sect283k1 (9) */ 263 return 9; 264 case NID_sect283r1: /* sect283r1 (10) */ 265 return 10; 266 case NID_sect409k1: /* sect409k1 (11) */ 267 return 11; 268 case NID_sect409r1: /* sect409r1 (12) */ 269 return 12; 270 case NID_sect571k1: /* sect571k1 (13) */ 271 return 13; 272 case NID_sect571r1: /* sect571r1 (14) */ 273 return 14; 274 case NID_secp160k1: /* secp160k1 (15) */ 275 return 15; 276 case NID_secp160r1: /* secp160r1 (16) */ 277 return 16; 278 case NID_secp160r2: /* secp160r2 (17) */ 279 return 17; 280 case NID_secp192k1: /* secp192k1 (18) */ 281 return 18; 282 case NID_X9_62_prime192v1: /* secp192r1 (19) */ 283 return 19; 284 case NID_secp224k1: /* secp224k1 (20) */ 285 return 20; 286 case NID_secp224r1: /* secp224r1 (21) */ 287 return 21; 288 case NID_secp256k1: /* secp256k1 (22) */ 289 return 22; 290 case NID_X9_62_prime256v1: /* secp256r1 (23) */ 291 return 23; 292 case NID_secp384r1: /* secp384r1 (24) */ 293 return 24; 294 case NID_secp521r1: /* secp521r1 (25) */ 295 return 25; 296 default: 297 return 0; 298 } 299 } 300 #endif /* OPENSSL_NO_EC */ 301 302 #ifndef OPENSSL_NO_TLSEXT 303 304 /* List of supported signature algorithms and hashes. Should make this 305 * customisable at some point, for now include everything we support. 306 */ 307 308 #ifdef OPENSSL_NO_RSA 309 #define tlsext_sigalg_rsa(md) /* */ 310 #else 311 #define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa, 312 #endif 313 314 #ifdef OPENSSL_NO_DSA 315 #define tlsext_sigalg_dsa(md) /* */ 316 #else 317 #define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa, 318 #endif 319 320 #ifdef OPENSSL_NO_ECDSA 321 #define tlsext_sigalg_ecdsa(md) /* */ 322 #else 323 #define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa, 324 #endif 325 326 #define tlsext_sigalg(md) \ 327 tlsext_sigalg_rsa(md) \ 328 tlsext_sigalg_dsa(md) \ 329 tlsext_sigalg_ecdsa(md) 330 331 static unsigned char tls12_sigalgs[] = { 332 #ifndef OPENSSL_NO_SHA512 333 tlsext_sigalg(TLSEXT_hash_sha512) 334 tlsext_sigalg(TLSEXT_hash_sha384) 335 #endif 336 #ifndef OPENSSL_NO_SHA256 337 tlsext_sigalg(TLSEXT_hash_sha256) 338 tlsext_sigalg(TLSEXT_hash_sha224) 339 #endif 340 #ifndef OPENSSL_NO_SHA 341 tlsext_sigalg(TLSEXT_hash_sha1) 342 #endif 343 #ifndef OPENSSL_NO_MD5 344 tlsext_sigalg_rsa(TLSEXT_hash_md5) 345 #endif 346 }; 347 348 int tls12_get_req_sig_algs(SSL *s, unsigned char *p) 349 { 350 size_t slen = sizeof(tls12_sigalgs); 351 #ifdef OPENSSL_FIPS 352 /* If FIPS mode don't include MD5 which is last */ 353 if (FIPS_mode()) 354 slen -= 2; 355 #endif 356 if (p) 357 memcpy(p, tls12_sigalgs, slen); 358 return (int)slen; 359 } 360 361 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 362 { 363 int extdatalen=0; 364 unsigned char *ret = p; 365 366 /* don't add extensions for SSLv3 unless doing secure renegotiation */ 367 if (s->client_version == SSL3_VERSION 368 && !s->s3->send_connection_binding) 369 return p; 370 371 ret+=2; 372 373 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 374 375 if (s->tlsext_hostname != NULL) 376 { 377 /* Add TLS extension servername to the Client Hello message */ 378 unsigned long size_str; 379 long lenmax; 380 381 /* check for enough space. 382 4 for the servername type and entension length 383 2 for servernamelist length 384 1 for the hostname type 385 2 for hostname length 386 + hostname length 387 */ 388 389 if ((lenmax = limit - ret - 9) < 0 390 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 391 return NULL; 392 393 /* extension type and length */ 394 s2n(TLSEXT_TYPE_server_name,ret); 395 s2n(size_str+5,ret); 396 397 /* length of servername list */ 398 s2n(size_str+3,ret); 399 400 /* hostname type, length and hostname */ 401 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; 402 s2n(size_str,ret); 403 memcpy(ret, s->tlsext_hostname, size_str); 404 ret+=size_str; 405 } 406 407 /* Add RI if renegotiating */ 408 if (s->renegotiate) 409 { 410 int el; 411 412 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) 413 { 414 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 415 return NULL; 416 } 417 418 if((limit - p - 4 - el) < 0) return NULL; 419 420 s2n(TLSEXT_TYPE_renegotiate,ret); 421 s2n(el,ret); 422 423 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) 424 { 425 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 426 return NULL; 427 } 428 429 ret += el; 430 } 431 432 #ifndef OPENSSL_NO_SRP 433 #define MIN(x,y) (((x)<(y))?(x):(y)) 434 /* we add SRP username the first time only if we have one! */ 435 if (s->srp_ctx.login != NULL) 436 {/* Add TLS extension SRP username to the Client Hello message */ 437 int login_len = MIN(strlen(s->srp_ctx.login) + 1, 255); 438 long lenmax; 439 440 if ((lenmax = limit - ret - 5) < 0) return NULL; 441 if (login_len > lenmax) return NULL; 442 if (login_len > 255) 443 { 444 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 445 return NULL; 446 } 447 s2n(TLSEXT_TYPE_srp,ret); 448 s2n(login_len+1,ret); 449 450 (*ret++) = (unsigned char) MIN(strlen(s->srp_ctx.login), 254); 451 memcpy(ret, s->srp_ctx.login, MIN(strlen(s->srp_ctx.login), 254)); 452 ret+=login_len; 453 } 454 #endif 455 456 #ifndef OPENSSL_NO_EC 457 if (s->tlsext_ecpointformatlist != NULL && 458 s->version != DTLS1_VERSION) 459 { 460 /* Add TLS extension ECPointFormats to the ClientHello message */ 461 long lenmax; 462 463 if ((lenmax = limit - ret - 5) < 0) return NULL; 464 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 465 if (s->tlsext_ecpointformatlist_length > 255) 466 { 467 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 468 return NULL; 469 } 470 471 s2n(TLSEXT_TYPE_ec_point_formats,ret); 472 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 473 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 474 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 475 ret+=s->tlsext_ecpointformatlist_length; 476 } 477 if (s->tlsext_ellipticcurvelist != NULL && 478 s->version != DTLS1_VERSION) 479 { 480 /* Add TLS extension EllipticCurves to the ClientHello message */ 481 long lenmax; 482 483 if ((lenmax = limit - ret - 6) < 0) return NULL; 484 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; 485 if (s->tlsext_ellipticcurvelist_length > 65532) 486 { 487 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 488 return NULL; 489 } 490 491 s2n(TLSEXT_TYPE_elliptic_curves,ret); 492 s2n(s->tlsext_ellipticcurvelist_length + 2, ret); 493 494 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for 495 * elliptic_curve_list, but the examples use two bytes. 496 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html 497 * resolves this to two bytes. 498 */ 499 s2n(s->tlsext_ellipticcurvelist_length, ret); 500 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 501 ret+=s->tlsext_ellipticcurvelist_length; 502 } 503 #endif /* OPENSSL_NO_EC */ 504 505 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) 506 { 507 int ticklen; 508 if (!s->new_session && s->session && s->session->tlsext_tick) 509 ticklen = s->session->tlsext_ticklen; 510 else if (s->session && s->tlsext_session_ticket && 511 s->tlsext_session_ticket->data) 512 { 513 ticklen = s->tlsext_session_ticket->length; 514 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 515 if (!s->session->tlsext_tick) 516 return NULL; 517 memcpy(s->session->tlsext_tick, 518 s->tlsext_session_ticket->data, 519 ticklen); 520 s->session->tlsext_ticklen = ticklen; 521 } 522 else 523 ticklen = 0; 524 if (ticklen == 0 && s->tlsext_session_ticket && 525 s->tlsext_session_ticket->data == NULL) 526 goto skip_ext; 527 /* Check for enough room 2 for extension type, 2 for len 528 * rest for ticket 529 */ 530 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; 531 s2n(TLSEXT_TYPE_session_ticket,ret); 532 s2n(ticklen,ret); 533 if (ticklen) 534 { 535 memcpy(ret, s->session->tlsext_tick, ticklen); 536 ret += ticklen; 537 } 538 } 539 skip_ext: 540 541 if (TLS1_get_version(s) >= TLS1_2_VERSION) 542 { 543 if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6) 544 return NULL; 545 s2n(TLSEXT_TYPE_signature_algorithms,ret); 546 s2n(sizeof(tls12_sigalgs) + 2, ret); 547 s2n(sizeof(tls12_sigalgs), ret); 548 memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs)); 549 ret += sizeof(tls12_sigalgs); 550 } 551 552 #ifdef TLSEXT_TYPE_opaque_prf_input 553 if (s->s3->client_opaque_prf_input != NULL && 554 s->version != DTLS1_VERSION) 555 { 556 size_t col = s->s3->client_opaque_prf_input_len; 557 558 if ((long)(limit - ret - 6 - col < 0)) 559 return NULL; 560 if (col > 0xFFFD) /* can't happen */ 561 return NULL; 562 563 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 564 s2n(col + 2, ret); 565 s2n(col, ret); 566 memcpy(ret, s->s3->client_opaque_prf_input, col); 567 ret += col; 568 } 569 #endif 570 571 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && 572 s->version != DTLS1_VERSION) 573 { 574 int i; 575 long extlen, idlen, itmp; 576 OCSP_RESPID *id; 577 578 idlen = 0; 579 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 580 { 581 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 582 itmp = i2d_OCSP_RESPID(id, NULL); 583 if (itmp <= 0) 584 return NULL; 585 idlen += itmp + 2; 586 } 587 588 if (s->tlsext_ocsp_exts) 589 { 590 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); 591 if (extlen < 0) 592 return NULL; 593 } 594 else 595 extlen = 0; 596 597 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; 598 s2n(TLSEXT_TYPE_status_request, ret); 599 if (extlen + idlen > 0xFFF0) 600 return NULL; 601 s2n(extlen + idlen + 5, ret); 602 *(ret++) = TLSEXT_STATUSTYPE_ocsp; 603 s2n(idlen, ret); 604 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 605 { 606 /* save position of id len */ 607 unsigned char *q = ret; 608 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 609 /* skip over id len */ 610 ret += 2; 611 itmp = i2d_OCSP_RESPID(id, &ret); 612 /* write id len */ 613 s2n(itmp, q); 614 } 615 s2n(extlen, ret); 616 if (extlen > 0) 617 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); 618 } 619 620 if ((extdatalen = ret-p-2)== 0) 621 return p; 622 623 s2n(extdatalen,p); 624 return ret; 625 } 626 627 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 628 { 629 int extdatalen=0; 630 unsigned char *ret = p; 631 632 /* don't add extensions for SSLv3, unless doing secure renegotiation */ 633 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) 634 return p; 635 636 ret+=2; 637 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 638 639 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) 640 { 641 if ((long)(limit - ret - 4) < 0) return NULL; 642 643 s2n(TLSEXT_TYPE_server_name,ret); 644 s2n(0,ret); 645 } 646 647 if(s->s3->send_connection_binding) 648 { 649 int el; 650 651 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) 652 { 653 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 654 return NULL; 655 } 656 657 if((limit - p - 4 - el) < 0) return NULL; 658 659 s2n(TLSEXT_TYPE_renegotiate,ret); 660 s2n(el,ret); 661 662 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) 663 { 664 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 665 return NULL; 666 } 667 668 ret += el; 669 } 670 671 #ifndef OPENSSL_NO_EC 672 if (s->tlsext_ecpointformatlist != NULL && 673 s->version != DTLS1_VERSION) 674 { 675 /* Add TLS extension ECPointFormats to the ServerHello message */ 676 long lenmax; 677 678 if ((lenmax = limit - ret - 5) < 0) return NULL; 679 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 680 if (s->tlsext_ecpointformatlist_length > 255) 681 { 682 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 683 return NULL; 684 } 685 686 s2n(TLSEXT_TYPE_ec_point_formats,ret); 687 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 688 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 689 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 690 ret+=s->tlsext_ecpointformatlist_length; 691 692 } 693 /* Currently the server should not respond with a SupportedCurves extension */ 694 #endif /* OPENSSL_NO_EC */ 695 696 if (s->tlsext_ticket_expected 697 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 698 { 699 if ((long)(limit - ret - 4) < 0) return NULL; 700 s2n(TLSEXT_TYPE_session_ticket,ret); 701 s2n(0,ret); 702 } 703 704 if (s->tlsext_status_expected) 705 { 706 if ((long)(limit - ret - 4) < 0) return NULL; 707 s2n(TLSEXT_TYPE_status_request,ret); 708 s2n(0,ret); 709 } 710 711 #ifdef TLSEXT_TYPE_opaque_prf_input 712 if (s->s3->server_opaque_prf_input != NULL && 713 s->version != DTLS1_VERSION) 714 { 715 size_t sol = s->s3->server_opaque_prf_input_len; 716 717 if ((long)(limit - ret - 6 - sol) < 0) 718 return NULL; 719 if (sol > 0xFFFD) /* can't happen */ 720 return NULL; 721 722 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 723 s2n(sol + 2, ret); 724 s2n(sol, ret); 725 memcpy(ret, s->s3->server_opaque_prf_input, sol); 726 ret += sol; 727 } 728 #endif 729 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 730 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) 731 { const unsigned char cryptopro_ext[36] = { 732 0xfd, 0xe8, /*65000*/ 733 0x00, 0x20, /*32 bytes length*/ 734 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 735 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 736 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 737 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; 738 if (limit-ret<36) return NULL; 739 memcpy(ret,cryptopro_ext,36); 740 ret+=36; 741 742 } 743 744 if ((extdatalen = ret-p-2)== 0) 745 return p; 746 747 s2n(extdatalen,p); 748 return ret; 749 } 750 751 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 752 { 753 unsigned short type; 754 unsigned short size; 755 unsigned short len; 756 unsigned char *data = *p; 757 int renegotiate_seen = 0; 758 int sigalg_seen = 0; 759 760 s->servername_done = 0; 761 s->tlsext_status_type = -1; 762 763 if (data >= (d+n-2)) 764 goto ri_check; 765 n2s(data,len); 766 767 if (data > (d+n-len)) 768 goto ri_check; 769 770 while (data <= (d+n-4)) 771 { 772 n2s(data,type); 773 n2s(data,size); 774 775 if (data+size > (d+n)) 776 goto ri_check; 777 #if 0 778 fprintf(stderr,"Received extension type %d size %d\n",type,size); 779 #endif 780 if (s->tlsext_debug_cb) 781 s->tlsext_debug_cb(s, 0, type, data, size, 782 s->tlsext_debug_arg); 783 /* The servername extension is treated as follows: 784 785 - Only the hostname type is supported with a maximum length of 255. 786 - The servername is rejected if too long or if it contains zeros, 787 in which case an fatal alert is generated. 788 - The servername field is maintained together with the session cache. 789 - When a session is resumed, the servername call back invoked in order 790 to allow the application to position itself to the right context. 791 - The servername is acknowledged if it is new for a session or when 792 it is identical to a previously used for the same session. 793 Applications can control the behaviour. They can at any time 794 set a 'desirable' servername for a new SSL object. This can be the 795 case for example with HTTPS when a Host: header field is received and 796 a renegotiation is requested. In this case, a possible servername 797 presented in the new client hello is only acknowledged if it matches 798 the value of the Host: field. 799 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 800 if they provide for changing an explicit servername context for the session, 801 i.e. when the session has been established with a servername extension. 802 - On session reconnect, the servername extension may be absent. 803 804 */ 805 806 if (type == TLSEXT_TYPE_server_name) 807 { 808 unsigned char *sdata; 809 int servname_type; 810 int dsize; 811 812 if (size < 2) 813 { 814 *al = SSL_AD_DECODE_ERROR; 815 return 0; 816 } 817 n2s(data,dsize); 818 size -= 2; 819 if (dsize > size ) 820 { 821 *al = SSL_AD_DECODE_ERROR; 822 return 0; 823 } 824 825 sdata = data; 826 while (dsize > 3) 827 { 828 servname_type = *(sdata++); 829 n2s(sdata,len); 830 dsize -= 3; 831 832 if (len > dsize) 833 { 834 *al = SSL_AD_DECODE_ERROR; 835 return 0; 836 } 837 if (s->servername_done == 0) 838 switch (servname_type) 839 { 840 case TLSEXT_NAMETYPE_host_name: 841 if (!s->hit) 842 { 843 if(s->session->tlsext_hostname) 844 { 845 *al = SSL_AD_DECODE_ERROR; 846 return 0; 847 } 848 if (len > TLSEXT_MAXLEN_host_name) 849 { 850 *al = TLS1_AD_UNRECOGNIZED_NAME; 851 return 0; 852 } 853 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) 854 { 855 *al = TLS1_AD_INTERNAL_ERROR; 856 return 0; 857 } 858 memcpy(s->session->tlsext_hostname, sdata, len); 859 s->session->tlsext_hostname[len]='\0'; 860 if (strlen(s->session->tlsext_hostname) != len) { 861 OPENSSL_free(s->session->tlsext_hostname); 862 s->session->tlsext_hostname = NULL; 863 *al = TLS1_AD_UNRECOGNIZED_NAME; 864 return 0; 865 } 866 s->servername_done = 1; 867 868 } 869 else 870 s->servername_done = s->session->tlsext_hostname 871 && strlen(s->session->tlsext_hostname) == len 872 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; 873 874 break; 875 876 default: 877 break; 878 } 879 880 dsize -= len; 881 } 882 if (dsize != 0) 883 { 884 *al = SSL_AD_DECODE_ERROR; 885 return 0; 886 } 887 888 } 889 #ifndef OPENSSL_NO_SRP 890 else if (type == TLSEXT_TYPE_srp) 891 { 892 if (size > 0) 893 { 894 len = data[0]; 895 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL) 896 return -1; 897 memcpy(s->srp_ctx.login, &data[1], len); 898 s->srp_ctx.login[len]='\0'; 899 } 900 } 901 #endif 902 903 #ifndef OPENSSL_NO_EC 904 else if (type == TLSEXT_TYPE_ec_point_formats && 905 s->version != DTLS1_VERSION) 906 { 907 unsigned char *sdata = data; 908 int ecpointformatlist_length = *(sdata++); 909 910 if (ecpointformatlist_length != size - 1) 911 { 912 *al = TLS1_AD_DECODE_ERROR; 913 return 0; 914 } 915 if (!s->hit) 916 { 917 if(s->session->tlsext_ecpointformatlist) 918 { 919 OPENSSL_free(s->session->tlsext_ecpointformatlist); 920 s->session->tlsext_ecpointformatlist = NULL; 921 } 922 s->session->tlsext_ecpointformatlist_length = 0; 923 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 924 { 925 *al = TLS1_AD_INTERNAL_ERROR; 926 return 0; 927 } 928 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 929 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 930 } 931 #if 0 932 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); 933 sdata = s->session->tlsext_ecpointformatlist; 934 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 935 fprintf(stderr,"%i ",*(sdata++)); 936 fprintf(stderr,"\n"); 937 #endif 938 } 939 else if (type == TLSEXT_TYPE_elliptic_curves && 940 s->version != DTLS1_VERSION) 941 { 942 unsigned char *sdata = data; 943 int ellipticcurvelist_length = (*(sdata++) << 8); 944 ellipticcurvelist_length += (*(sdata++)); 945 946 if (ellipticcurvelist_length != size - 2) 947 { 948 *al = TLS1_AD_DECODE_ERROR; 949 return 0; 950 } 951 if (!s->hit) 952 { 953 if(s->session->tlsext_ellipticcurvelist) 954 { 955 *al = TLS1_AD_DECODE_ERROR; 956 return 0; 957 } 958 s->session->tlsext_ellipticcurvelist_length = 0; 959 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) 960 { 961 *al = TLS1_AD_INTERNAL_ERROR; 962 return 0; 963 } 964 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; 965 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); 966 } 967 #if 0 968 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); 969 sdata = s->session->tlsext_ellipticcurvelist; 970 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) 971 fprintf(stderr,"%i ",*(sdata++)); 972 fprintf(stderr,"\n"); 973 #endif 974 } 975 #endif /* OPENSSL_NO_EC */ 976 #ifdef TLSEXT_TYPE_opaque_prf_input 977 else if (type == TLSEXT_TYPE_opaque_prf_input && 978 s->version != DTLS1_VERSION) 979 { 980 unsigned char *sdata = data; 981 982 if (size < 2) 983 { 984 *al = SSL_AD_DECODE_ERROR; 985 return 0; 986 } 987 n2s(sdata, s->s3->client_opaque_prf_input_len); 988 if (s->s3->client_opaque_prf_input_len != size - 2) 989 { 990 *al = SSL_AD_DECODE_ERROR; 991 return 0; 992 } 993 994 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 995 OPENSSL_free(s->s3->client_opaque_prf_input); 996 if (s->s3->client_opaque_prf_input_len == 0) 997 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 998 else 999 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); 1000 if (s->s3->client_opaque_prf_input == NULL) 1001 { 1002 *al = TLS1_AD_INTERNAL_ERROR; 1003 return 0; 1004 } 1005 } 1006 #endif 1007 else if (type == TLSEXT_TYPE_session_ticket) 1008 { 1009 if (s->tls_session_ticket_ext_cb && 1010 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1011 { 1012 *al = TLS1_AD_INTERNAL_ERROR; 1013 return 0; 1014 } 1015 } 1016 else if (type == TLSEXT_TYPE_renegotiate) 1017 { 1018 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) 1019 return 0; 1020 renegotiate_seen = 1; 1021 } 1022 else if (type == TLSEXT_TYPE_signature_algorithms) 1023 { 1024 int dsize; 1025 if (sigalg_seen || size < 2) 1026 { 1027 *al = SSL_AD_DECODE_ERROR; 1028 return 0; 1029 } 1030 sigalg_seen = 1; 1031 n2s(data,dsize); 1032 size -= 2; 1033 if (dsize != size || dsize & 1) 1034 { 1035 *al = SSL_AD_DECODE_ERROR; 1036 return 0; 1037 } 1038 if (!tls1_process_sigalgs(s, data, dsize)) 1039 { 1040 *al = SSL_AD_DECODE_ERROR; 1041 return 0; 1042 } 1043 } 1044 else if (type == TLSEXT_TYPE_status_request && 1045 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) 1046 { 1047 1048 if (size < 5) 1049 { 1050 *al = SSL_AD_DECODE_ERROR; 1051 return 0; 1052 } 1053 1054 s->tlsext_status_type = *data++; 1055 size--; 1056 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) 1057 { 1058 const unsigned char *sdata; 1059 int dsize; 1060 /* Read in responder_id_list */ 1061 n2s(data,dsize); 1062 size -= 2; 1063 if (dsize > size ) 1064 { 1065 *al = SSL_AD_DECODE_ERROR; 1066 return 0; 1067 } 1068 while (dsize > 0) 1069 { 1070 OCSP_RESPID *id; 1071 int idsize; 1072 if (dsize < 4) 1073 { 1074 *al = SSL_AD_DECODE_ERROR; 1075 return 0; 1076 } 1077 n2s(data, idsize); 1078 dsize -= 2 + idsize; 1079 size -= 2 + idsize; 1080 if (dsize < 0) 1081 { 1082 *al = SSL_AD_DECODE_ERROR; 1083 return 0; 1084 } 1085 sdata = data; 1086 data += idsize; 1087 id = d2i_OCSP_RESPID(NULL, 1088 &sdata, idsize); 1089 if (!id) 1090 { 1091 *al = SSL_AD_DECODE_ERROR; 1092 return 0; 1093 } 1094 if (data != sdata) 1095 { 1096 OCSP_RESPID_free(id); 1097 *al = SSL_AD_DECODE_ERROR; 1098 return 0; 1099 } 1100 if (!s->tlsext_ocsp_ids 1101 && !(s->tlsext_ocsp_ids = 1102 sk_OCSP_RESPID_new_null())) 1103 { 1104 OCSP_RESPID_free(id); 1105 *al = SSL_AD_INTERNAL_ERROR; 1106 return 0; 1107 } 1108 if (!sk_OCSP_RESPID_push( 1109 s->tlsext_ocsp_ids, id)) 1110 { 1111 OCSP_RESPID_free(id); 1112 *al = SSL_AD_INTERNAL_ERROR; 1113 return 0; 1114 } 1115 } 1116 1117 /* Read in request_extensions */ 1118 if (size < 2) 1119 { 1120 *al = SSL_AD_DECODE_ERROR; 1121 return 0; 1122 } 1123 n2s(data,dsize); 1124 size -= 2; 1125 if (dsize != size) 1126 { 1127 *al = SSL_AD_DECODE_ERROR; 1128 return 0; 1129 } 1130 sdata = data; 1131 if (dsize > 0) 1132 { 1133 s->tlsext_ocsp_exts = 1134 d2i_X509_EXTENSIONS(NULL, 1135 &sdata, dsize); 1136 if (!s->tlsext_ocsp_exts 1137 || (data + dsize != sdata)) 1138 { 1139 *al = SSL_AD_DECODE_ERROR; 1140 return 0; 1141 } 1142 } 1143 } 1144 /* We don't know what to do with any other type 1145 * so ignore it. 1146 */ 1147 else 1148 s->tlsext_status_type = -1; 1149 } 1150 1151 /* session ticket processed earlier */ 1152 data+=size; 1153 } 1154 1155 *p = data; 1156 1157 ri_check: 1158 1159 /* Need RI if renegotiating */ 1160 1161 if (!renegotiate_seen && s->renegotiate && 1162 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1163 { 1164 *al = SSL_AD_HANDSHAKE_FAILURE; 1165 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, 1166 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1167 return 0; 1168 } 1169 1170 return 1; 1171 } 1172 1173 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 1174 { 1175 unsigned short length; 1176 unsigned short type; 1177 unsigned short size; 1178 unsigned char *data = *p; 1179 int tlsext_servername = 0; 1180 int renegotiate_seen = 0; 1181 1182 if (data >= (d+n-2)) 1183 goto ri_check; 1184 1185 n2s(data,length); 1186 if (data+length != d+n) 1187 { 1188 *al = SSL_AD_DECODE_ERROR; 1189 return 0; 1190 } 1191 1192 while(data <= (d+n-4)) 1193 { 1194 n2s(data,type); 1195 n2s(data,size); 1196 1197 if (data+size > (d+n)) 1198 goto ri_check; 1199 1200 if (s->tlsext_debug_cb) 1201 s->tlsext_debug_cb(s, 1, type, data, size, 1202 s->tlsext_debug_arg); 1203 1204 if (type == TLSEXT_TYPE_server_name) 1205 { 1206 if (s->tlsext_hostname == NULL || size > 0) 1207 { 1208 *al = TLS1_AD_UNRECOGNIZED_NAME; 1209 return 0; 1210 } 1211 tlsext_servername = 1; 1212 } 1213 1214 #ifndef OPENSSL_NO_EC 1215 else if (type == TLSEXT_TYPE_ec_point_formats && 1216 s->version != DTLS1_VERSION) 1217 { 1218 unsigned char *sdata = data; 1219 int ecpointformatlist_length = *(sdata++); 1220 1221 if (ecpointformatlist_length != size - 1) 1222 { 1223 *al = TLS1_AD_DECODE_ERROR; 1224 return 0; 1225 } 1226 s->session->tlsext_ecpointformatlist_length = 0; 1227 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 1228 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 1229 { 1230 *al = TLS1_AD_INTERNAL_ERROR; 1231 return 0; 1232 } 1233 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 1234 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 1235 #if 0 1236 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); 1237 sdata = s->session->tlsext_ecpointformatlist; 1238 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1239 fprintf(stderr,"%i ",*(sdata++)); 1240 fprintf(stderr,"\n"); 1241 #endif 1242 } 1243 #endif /* OPENSSL_NO_EC */ 1244 1245 else if (type == TLSEXT_TYPE_session_ticket) 1246 { 1247 if (s->tls_session_ticket_ext_cb && 1248 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1249 { 1250 *al = TLS1_AD_INTERNAL_ERROR; 1251 return 0; 1252 } 1253 if ((SSL_get_options(s) & SSL_OP_NO_TICKET) 1254 || (size > 0)) 1255 { 1256 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1257 return 0; 1258 } 1259 s->tlsext_ticket_expected = 1; 1260 } 1261 #ifdef TLSEXT_TYPE_opaque_prf_input 1262 else if (type == TLSEXT_TYPE_opaque_prf_input && 1263 s->version != DTLS1_VERSION) 1264 { 1265 unsigned char *sdata = data; 1266 1267 if (size < 2) 1268 { 1269 *al = SSL_AD_DECODE_ERROR; 1270 return 0; 1271 } 1272 n2s(sdata, s->s3->server_opaque_prf_input_len); 1273 if (s->s3->server_opaque_prf_input_len != size - 2) 1274 { 1275 *al = SSL_AD_DECODE_ERROR; 1276 return 0; 1277 } 1278 1279 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1280 OPENSSL_free(s->s3->server_opaque_prf_input); 1281 if (s->s3->server_opaque_prf_input_len == 0) 1282 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1283 else 1284 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); 1285 1286 if (s->s3->server_opaque_prf_input == NULL) 1287 { 1288 *al = TLS1_AD_INTERNAL_ERROR; 1289 return 0; 1290 } 1291 } 1292 #endif 1293 else if (type == TLSEXT_TYPE_status_request && 1294 s->version != DTLS1_VERSION) 1295 { 1296 /* MUST be empty and only sent if we've requested 1297 * a status request message. 1298 */ 1299 if ((s->tlsext_status_type == -1) || (size > 0)) 1300 { 1301 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1302 return 0; 1303 } 1304 /* Set flag to expect CertificateStatus message */ 1305 s->tlsext_status_expected = 1; 1306 } 1307 else if (type == TLSEXT_TYPE_renegotiate) 1308 { 1309 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) 1310 return 0; 1311 renegotiate_seen = 1; 1312 } 1313 data+=size; 1314 } 1315 1316 if (data != d+n) 1317 { 1318 *al = SSL_AD_DECODE_ERROR; 1319 return 0; 1320 } 1321 1322 if (!s->hit && tlsext_servername == 1) 1323 { 1324 if (s->tlsext_hostname) 1325 { 1326 if (s->session->tlsext_hostname == NULL) 1327 { 1328 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 1329 if (!s->session->tlsext_hostname) 1330 { 1331 *al = SSL_AD_UNRECOGNIZED_NAME; 1332 return 0; 1333 } 1334 } 1335 else 1336 { 1337 *al = SSL_AD_DECODE_ERROR; 1338 return 0; 1339 } 1340 } 1341 } 1342 1343 *p = data; 1344 1345 ri_check: 1346 1347 /* Determine if we need to see RI. Strictly speaking if we want to 1348 * avoid an attack we should *always* see RI even on initial server 1349 * hello because the client doesn't see any renegotiation during an 1350 * attack. However this would mean we could not connect to any server 1351 * which doesn't support RI so for the immediate future tolerate RI 1352 * absence on initial connect only. 1353 */ 1354 if (!renegotiate_seen 1355 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) 1356 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1357 { 1358 *al = SSL_AD_HANDSHAKE_FAILURE; 1359 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, 1360 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1361 return 0; 1362 } 1363 1364 return 1; 1365 } 1366 1367 1368 int ssl_prepare_clienthello_tlsext(SSL *s) 1369 { 1370 #ifndef OPENSSL_NO_EC 1371 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 1372 * and elliptic curves we support. 1373 */ 1374 int using_ecc = 0; 1375 int i; 1376 unsigned char *j; 1377 unsigned long alg_k, alg_a; 1378 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); 1379 1380 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) 1381 { 1382 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); 1383 1384 alg_k = c->algorithm_mkey; 1385 alg_a = c->algorithm_auth; 1386 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) 1387 { 1388 using_ecc = 1; 1389 break; 1390 } 1391 } 1392 using_ecc = using_ecc && (s->version >= TLS1_VERSION); 1393 if (using_ecc) 1394 { 1395 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1396 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1397 { 1398 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1399 return -1; 1400 } 1401 s->tlsext_ecpointformatlist_length = 3; 1402 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1403 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1404 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1405 1406 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ 1407 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); 1408 s->tlsext_ellipticcurvelist_length = sizeof(pref_list)/sizeof(pref_list[0]) * 2; 1409 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 1410 { 1411 s->tlsext_ellipticcurvelist_length = 0; 1412 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1413 return -1; 1414 } 1415 for (i = 0, j = s->tlsext_ellipticcurvelist; (unsigned int)i < 1416 sizeof(pref_list)/sizeof(pref_list[0]); i++) 1417 { 1418 int id = tls1_ec_nid2curve_id(pref_list[i]); 1419 s2n(id,j); 1420 } 1421 } 1422 #endif /* OPENSSL_NO_EC */ 1423 1424 #ifdef TLSEXT_TYPE_opaque_prf_input 1425 { 1426 int r = 1; 1427 1428 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1429 { 1430 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1431 if (!r) 1432 return -1; 1433 } 1434 1435 if (s->tlsext_opaque_prf_input != NULL) 1436 { 1437 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 1438 OPENSSL_free(s->s3->client_opaque_prf_input); 1439 1440 if (s->tlsext_opaque_prf_input_len == 0) 1441 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1442 else 1443 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1444 if (s->s3->client_opaque_prf_input == NULL) 1445 { 1446 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1447 return -1; 1448 } 1449 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1450 } 1451 1452 if (r == 2) 1453 /* at callback's request, insist on receiving an appropriate server opaque PRF input */ 1454 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1455 } 1456 #endif 1457 1458 return 1; 1459 } 1460 1461 int ssl_prepare_serverhello_tlsext(SSL *s) 1462 { 1463 #ifndef OPENSSL_NO_EC 1464 /* If we are server and using an ECC cipher suite, send the point formats we support 1465 * if the client sent us an ECPointsFormat extension. Note that the server is not 1466 * supposed to send an EllipticCurves extension. 1467 */ 1468 1469 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1470 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1471 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); 1472 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); 1473 1474 if (using_ecc) 1475 { 1476 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1477 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1478 { 1479 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1480 return -1; 1481 } 1482 s->tlsext_ecpointformatlist_length = 3; 1483 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1484 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1485 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1486 } 1487 #endif /* OPENSSL_NO_EC */ 1488 1489 return 1; 1490 } 1491 1492 int ssl_check_clienthello_tlsext(SSL *s) 1493 { 1494 int ret=SSL_TLSEXT_ERR_NOACK; 1495 int al = SSL_AD_UNRECOGNIZED_NAME; 1496 1497 #ifndef OPENSSL_NO_EC 1498 /* The handling of the ECPointFormats extension is done elsewhere, namely in 1499 * ssl3_choose_cipher in s3_lib.c. 1500 */ 1501 /* The handling of the EllipticCurves extension is done elsewhere, namely in 1502 * ssl3_choose_cipher in s3_lib.c. 1503 */ 1504 #endif 1505 1506 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1507 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1508 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1509 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1510 1511 /* If status request then ask callback what to do. 1512 * Note: this must be called after servername callbacks in case 1513 * the certificate has changed. 1514 */ 1515 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) 1516 { 1517 int r; 1518 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1519 switch (r) 1520 { 1521 /* We don't want to send a status request response */ 1522 case SSL_TLSEXT_ERR_NOACK: 1523 s->tlsext_status_expected = 0; 1524 break; 1525 /* status request response should be sent */ 1526 case SSL_TLSEXT_ERR_OK: 1527 if (s->tlsext_ocsp_resp) 1528 s->tlsext_status_expected = 1; 1529 else 1530 s->tlsext_status_expected = 0; 1531 break; 1532 /* something bad happened */ 1533 case SSL_TLSEXT_ERR_ALERT_FATAL: 1534 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1535 al = SSL_AD_INTERNAL_ERROR; 1536 goto err; 1537 } 1538 } 1539 else 1540 s->tlsext_status_expected = 0; 1541 1542 #ifdef TLSEXT_TYPE_opaque_prf_input 1543 { 1544 /* This sort of belongs into ssl_prepare_serverhello_tlsext(), 1545 * but we might be sending an alert in response to the client hello, 1546 * so this has to happen here in ssl_check_clienthello_tlsext(). */ 1547 1548 int r = 1; 1549 1550 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1551 { 1552 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1553 if (!r) 1554 { 1555 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1556 al = SSL_AD_INTERNAL_ERROR; 1557 goto err; 1558 } 1559 } 1560 1561 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1562 OPENSSL_free(s->s3->server_opaque_prf_input); 1563 s->s3->server_opaque_prf_input = NULL; 1564 1565 if (s->tlsext_opaque_prf_input != NULL) 1566 { 1567 if (s->s3->client_opaque_prf_input != NULL && 1568 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) 1569 { 1570 /* can only use this extension if we have a server opaque PRF input 1571 * of the same length as the client opaque PRF input! */ 1572 1573 if (s->tlsext_opaque_prf_input_len == 0) 1574 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1575 else 1576 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1577 if (s->s3->server_opaque_prf_input == NULL) 1578 { 1579 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1580 al = SSL_AD_INTERNAL_ERROR; 1581 goto err; 1582 } 1583 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1584 } 1585 } 1586 1587 if (r == 2 && s->s3->server_opaque_prf_input == NULL) 1588 { 1589 /* The callback wants to enforce use of the extension, 1590 * but we can't do that with the client opaque PRF input; 1591 * abort the handshake. 1592 */ 1593 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1594 al = SSL_AD_HANDSHAKE_FAILURE; 1595 } 1596 } 1597 1598 #endif 1599 err: 1600 switch (ret) 1601 { 1602 case SSL_TLSEXT_ERR_ALERT_FATAL: 1603 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1604 return -1; 1605 1606 case SSL_TLSEXT_ERR_ALERT_WARNING: 1607 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1608 return 1; 1609 1610 case SSL_TLSEXT_ERR_NOACK: 1611 s->servername_done=0; 1612 default: 1613 return 1; 1614 } 1615 } 1616 1617 int ssl_check_serverhello_tlsext(SSL *s) 1618 { 1619 int ret=SSL_TLSEXT_ERR_NOACK; 1620 int al = SSL_AD_UNRECOGNIZED_NAME; 1621 1622 #ifndef OPENSSL_NO_EC 1623 /* If we are client and using an elliptic curve cryptography cipher 1624 * suite, then if server returns an EC point formats lists extension 1625 * it must contain uncompressed. 1626 */ 1627 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1628 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1629 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 1630 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) && 1631 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) 1632 { 1633 /* we are using an ECC cipher */ 1634 size_t i; 1635 unsigned char *list; 1636 int found_uncompressed = 0; 1637 list = s->session->tlsext_ecpointformatlist; 1638 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1639 { 1640 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) 1641 { 1642 found_uncompressed = 1; 1643 break; 1644 } 1645 } 1646 if (!found_uncompressed) 1647 { 1648 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1649 return -1; 1650 } 1651 } 1652 ret = SSL_TLSEXT_ERR_OK; 1653 #endif /* OPENSSL_NO_EC */ 1654 1655 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1656 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1657 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1658 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1659 1660 #ifdef TLSEXT_TYPE_opaque_prf_input 1661 if (s->s3->server_opaque_prf_input_len > 0) 1662 { 1663 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. 1664 * So first verify that we really have a value from the server too. */ 1665 1666 if (s->s3->server_opaque_prf_input == NULL) 1667 { 1668 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1669 al = SSL_AD_HANDSHAKE_FAILURE; 1670 } 1671 1672 /* Anytime the server *has* sent an opaque PRF input, we need to check 1673 * that we have a client opaque PRF input of the same size. */ 1674 if (s->s3->client_opaque_prf_input == NULL || 1675 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) 1676 { 1677 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1678 al = SSL_AD_ILLEGAL_PARAMETER; 1679 } 1680 } 1681 #endif 1682 1683 /* If we've requested certificate status and we wont get one 1684 * tell the callback 1685 */ 1686 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) 1687 && s->ctx && s->ctx->tlsext_status_cb) 1688 { 1689 int r; 1690 /* Set resp to NULL, resplen to -1 so callback knows 1691 * there is no response. 1692 */ 1693 if (s->tlsext_ocsp_resp) 1694 { 1695 OPENSSL_free(s->tlsext_ocsp_resp); 1696 s->tlsext_ocsp_resp = NULL; 1697 } 1698 s->tlsext_ocsp_resplen = -1; 1699 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1700 if (r == 0) 1701 { 1702 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1703 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1704 } 1705 if (r < 0) 1706 { 1707 al = SSL_AD_INTERNAL_ERROR; 1708 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1709 } 1710 } 1711 1712 switch (ret) 1713 { 1714 case SSL_TLSEXT_ERR_ALERT_FATAL: 1715 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1716 return -1; 1717 1718 case SSL_TLSEXT_ERR_ALERT_WARNING: 1719 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1720 return 1; 1721 1722 case SSL_TLSEXT_ERR_NOACK: 1723 s->servername_done=0; 1724 default: 1725 return 1; 1726 } 1727 } 1728 1729 /* Since the server cache lookup is done early on in the processing of client 1730 * hello and other operations depend on the result we need to handle any TLS 1731 * session ticket extension at the same time. 1732 */ 1733 1734 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, 1735 const unsigned char *limit, SSL_SESSION **ret) 1736 { 1737 /* Point after session ID in client hello */ 1738 const unsigned char *p = session_id + len; 1739 unsigned short i; 1740 1741 /* If tickets disabled behave as if no ticket present 1742 * to permit stateful resumption. 1743 */ 1744 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1745 return 1; 1746 1747 if ((s->version <= SSL3_VERSION) || !limit) 1748 return 1; 1749 if (p >= limit) 1750 return -1; 1751 /* Skip past DTLS cookie */ 1752 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1753 { 1754 i = *(p++); 1755 p+= i; 1756 if (p >= limit) 1757 return -1; 1758 } 1759 /* Skip past cipher list */ 1760 n2s(p, i); 1761 p+= i; 1762 if (p >= limit) 1763 return -1; 1764 /* Skip past compression algorithm list */ 1765 i = *(p++); 1766 p += i; 1767 if (p > limit) 1768 return -1; 1769 /* Now at start of extensions */ 1770 if ((p + 2) >= limit) 1771 return 1; 1772 n2s(p, i); 1773 while ((p + 4) <= limit) 1774 { 1775 unsigned short type, size; 1776 n2s(p, type); 1777 n2s(p, size); 1778 if (p + size > limit) 1779 return 1; 1780 if (type == TLSEXT_TYPE_session_ticket) 1781 { 1782 /* If tickets disabled indicate cache miss which will 1783 * trigger a full handshake 1784 */ 1785 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1786 return 1; 1787 /* If zero length note client will accept a ticket 1788 * and indicate cache miss to trigger full handshake 1789 */ 1790 if (size == 0) 1791 { 1792 s->tlsext_ticket_expected = 1; 1793 return 0; /* Cache miss */ 1794 } 1795 if (s->tls_session_secret_cb) 1796 { 1797 /* Indicate cache miss here and instead of 1798 * generating the session from ticket now, 1799 * trigger abbreviated handshake based on 1800 * external mechanism to calculate the master 1801 * secret later. */ 1802 return 0; 1803 } 1804 return tls_decrypt_ticket(s, p, size, session_id, len, 1805 ret); 1806 } 1807 p += size; 1808 } 1809 return 1; 1810 } 1811 1812 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1813 const unsigned char *sess_id, int sesslen, 1814 SSL_SESSION **psess) 1815 { 1816 SSL_SESSION *sess; 1817 unsigned char *sdec; 1818 const unsigned char *p; 1819 int slen, mlen, renew_ticket = 0; 1820 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1821 HMAC_CTX hctx; 1822 EVP_CIPHER_CTX ctx; 1823 SSL_CTX *tctx = s->initial_ctx; 1824 /* Need at least keyname + iv + some encrypted data */ 1825 if (eticklen < 48) 1826 goto tickerr; 1827 /* Initialize session ticket encryption and HMAC contexts */ 1828 HMAC_CTX_init(&hctx); 1829 EVP_CIPHER_CTX_init(&ctx); 1830 if (tctx->tlsext_ticket_key_cb) 1831 { 1832 unsigned char *nctick = (unsigned char *)etick; 1833 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, 1834 &ctx, &hctx, 0); 1835 if (rv < 0) 1836 return -1; 1837 if (rv == 0) 1838 goto tickerr; 1839 if (rv == 2) 1840 renew_ticket = 1; 1841 } 1842 else 1843 { 1844 /* Check key name matches */ 1845 if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) 1846 goto tickerr; 1847 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1848 tlsext_tick_md(), NULL); 1849 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1850 tctx->tlsext_tick_aes_key, etick + 16); 1851 } 1852 /* Attempt to process session ticket, first conduct sanity and 1853 * integrity checks on ticket. 1854 */ 1855 mlen = HMAC_size(&hctx); 1856 if (mlen < 0) 1857 { 1858 EVP_CIPHER_CTX_cleanup(&ctx); 1859 return -1; 1860 } 1861 eticklen -= mlen; 1862 /* Check HMAC of encrypted ticket */ 1863 HMAC_Update(&hctx, etick, eticklen); 1864 HMAC_Final(&hctx, tick_hmac, NULL); 1865 HMAC_CTX_cleanup(&hctx); 1866 if (memcmp(tick_hmac, etick + eticklen, mlen)) 1867 goto tickerr; 1868 /* Attempt to decrypt session data */ 1869 /* Move p after IV to start of encrypted ticket, update length */ 1870 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1871 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1872 sdec = OPENSSL_malloc(eticklen); 1873 if (!sdec) 1874 { 1875 EVP_CIPHER_CTX_cleanup(&ctx); 1876 return -1; 1877 } 1878 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); 1879 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) 1880 goto tickerr; 1881 slen += mlen; 1882 EVP_CIPHER_CTX_cleanup(&ctx); 1883 p = sdec; 1884 1885 sess = d2i_SSL_SESSION(NULL, &p, slen); 1886 OPENSSL_free(sdec); 1887 if (sess) 1888 { 1889 /* The session ID if non-empty is used by some clients to 1890 * detect that the ticket has been accepted. So we copy it to 1891 * the session structure. If it is empty set length to zero 1892 * as required by standard. 1893 */ 1894 if (sesslen) 1895 memcpy(sess->session_id, sess_id, sesslen); 1896 sess->session_id_length = sesslen; 1897 *psess = sess; 1898 s->tlsext_ticket_expected = renew_ticket; 1899 return 1; 1900 } 1901 /* If session decrypt failure indicate a cache miss and set state to 1902 * send a new ticket 1903 */ 1904 tickerr: 1905 s->tlsext_ticket_expected = 1; 1906 return 0; 1907 } 1908 1909 /* Tables to translate from NIDs to TLS v1.2 ids */ 1910 1911 typedef struct 1912 { 1913 int nid; 1914 int id; 1915 } tls12_lookup; 1916 1917 static tls12_lookup tls12_md[] = { 1918 #ifndef OPENSSL_NO_MD5 1919 {NID_md5, TLSEXT_hash_md5}, 1920 #endif 1921 #ifndef OPENSSL_NO_SHA 1922 {NID_sha1, TLSEXT_hash_sha1}, 1923 #endif 1924 #ifndef OPENSSL_NO_SHA256 1925 {NID_sha224, TLSEXT_hash_sha224}, 1926 {NID_sha256, TLSEXT_hash_sha256}, 1927 #endif 1928 #ifndef OPENSSL_NO_SHA512 1929 {NID_sha384, TLSEXT_hash_sha384}, 1930 {NID_sha512, TLSEXT_hash_sha512} 1931 #endif 1932 }; 1933 1934 static tls12_lookup tls12_sig[] = { 1935 #ifndef OPENSSL_NO_RSA 1936 {EVP_PKEY_RSA, TLSEXT_signature_rsa}, 1937 #endif 1938 #ifndef OPENSSL_NO_RSA 1939 {EVP_PKEY_DSA, TLSEXT_signature_dsa}, 1940 #endif 1941 #ifndef OPENSSL_NO_ECDSA 1942 {EVP_PKEY_EC, TLSEXT_signature_ecdsa} 1943 #endif 1944 }; 1945 1946 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen) 1947 { 1948 size_t i; 1949 for (i = 0; i < tlen; i++) 1950 { 1951 if (table[i].nid == nid) 1952 return table[i].id; 1953 } 1954 return -1; 1955 } 1956 #if 0 1957 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen) 1958 { 1959 size_t i; 1960 for (i = 0; i < tlen; i++) 1961 { 1962 if (table[i].id == id) 1963 return table[i].nid; 1964 } 1965 return -1; 1966 } 1967 #endif 1968 1969 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md) 1970 { 1971 int sig_id, md_id; 1972 md_id = tls12_find_id(EVP_MD_type(md), tls12_md, 1973 sizeof(tls12_md)/sizeof(tls12_lookup)); 1974 if (md_id == -1) 1975 return 0; 1976 sig_id = tls12_get_sigid(pk); 1977 if (sig_id == -1) 1978 return 0; 1979 p[0] = (unsigned char)md_id; 1980 p[1] = (unsigned char)sig_id; 1981 return 1; 1982 } 1983 1984 int tls12_get_sigid(const EVP_PKEY *pk) 1985 { 1986 return tls12_find_id(pk->type, tls12_sig, 1987 sizeof(tls12_sig)/sizeof(tls12_lookup)); 1988 } 1989 1990 const EVP_MD *tls12_get_hash(unsigned char hash_alg) 1991 { 1992 switch(hash_alg) 1993 { 1994 #ifndef OPENSSL_NO_MD5 1995 case TLSEXT_hash_md5: 1996 #ifdef OPENSSL_FIPS 1997 if (FIPS_mode()) 1998 return NULL; 1999 #endif 2000 return EVP_md5(); 2001 #endif 2002 #ifndef OPENSSL_NO_SHA 2003 case TLSEXT_hash_sha1: 2004 return EVP_sha1(); 2005 #endif 2006 #ifndef OPENSSL_NO_SHA256 2007 case TLSEXT_hash_sha224: 2008 return EVP_sha224(); 2009 2010 case TLSEXT_hash_sha256: 2011 return EVP_sha256(); 2012 #endif 2013 #ifndef OPENSSL_NO_SHA512 2014 case TLSEXT_hash_sha384: 2015 return EVP_sha384(); 2016 2017 case TLSEXT_hash_sha512: 2018 return EVP_sha512(); 2019 #endif 2020 default: 2021 return NULL; 2022 2023 } 2024 } 2025 2026 /* Set preferred digest for each key type */ 2027 2028 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize) 2029 { 2030 int i, idx; 2031 const EVP_MD *md; 2032 CERT *c = s->cert; 2033 /* Extension ignored for TLS versions below 1.2 */ 2034 if (TLS1_get_version(s) < TLS1_2_VERSION) 2035 return 1; 2036 /* Should never happen */ 2037 if (!c) 2038 return 0; 2039 2040 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL; 2041 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL; 2042 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL; 2043 c->pkeys[SSL_PKEY_ECC].digest = NULL; 2044 2045 for (i = 0; i < dsize; i += 2) 2046 { 2047 unsigned char hash_alg = data[i], sig_alg = data[i+1]; 2048 2049 switch(sig_alg) 2050 { 2051 #ifndef OPENSSL_NO_RSA 2052 case TLSEXT_signature_rsa: 2053 idx = SSL_PKEY_RSA_SIGN; 2054 break; 2055 #endif 2056 #ifndef OPENSSL_NO_DSA 2057 case TLSEXT_signature_dsa: 2058 idx = SSL_PKEY_DSA_SIGN; 2059 break; 2060 #endif 2061 #ifndef OPENSSL_NO_ECDSA 2062 case TLSEXT_signature_ecdsa: 2063 idx = SSL_PKEY_ECC; 2064 break; 2065 #endif 2066 default: 2067 continue; 2068 } 2069 2070 if (c->pkeys[idx].digest == NULL) 2071 { 2072 md = tls12_get_hash(hash_alg); 2073 if (md) 2074 { 2075 c->pkeys[idx].digest = md; 2076 if (idx == SSL_PKEY_RSA_SIGN) 2077 c->pkeys[SSL_PKEY_RSA_ENC].digest = md; 2078 } 2079 } 2080 2081 } 2082 2083 2084 /* Set any remaining keys to default values. NOTE: if alg is not 2085 * supported it stays as NULL. 2086 */ 2087 #ifndef OPENSSL_NO_DSA 2088 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest) 2089 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1(); 2090 #endif 2091 #ifndef OPENSSL_NO_RSA 2092 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) 2093 { 2094 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1(); 2095 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1(); 2096 } 2097 #endif 2098 #ifndef OPENSSL_NO_ECDSA 2099 if (!c->pkeys[SSL_PKEY_ECC].digest) 2100 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa(); 2101 #endif 2102 return 1; 2103 } 2104 2105 #endif 2106