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=TLS1_VERSION; 170 } 171 172 #ifndef OPENSSL_NO_EC 173 static int nid_list[] = 174 { 175 NID_sect163k1, /* sect163k1 (1) */ 176 NID_sect163r1, /* sect163r1 (2) */ 177 NID_sect163r2, /* sect163r2 (3) */ 178 NID_sect193r1, /* sect193r1 (4) */ 179 NID_sect193r2, /* sect193r2 (5) */ 180 NID_sect233k1, /* sect233k1 (6) */ 181 NID_sect233r1, /* sect233r1 (7) */ 182 NID_sect239k1, /* sect239k1 (8) */ 183 NID_sect283k1, /* sect283k1 (9) */ 184 NID_sect283r1, /* sect283r1 (10) */ 185 NID_sect409k1, /* sect409k1 (11) */ 186 NID_sect409r1, /* sect409r1 (12) */ 187 NID_sect571k1, /* sect571k1 (13) */ 188 NID_sect571r1, /* sect571r1 (14) */ 189 NID_secp160k1, /* secp160k1 (15) */ 190 NID_secp160r1, /* secp160r1 (16) */ 191 NID_secp160r2, /* secp160r2 (17) */ 192 NID_secp192k1, /* secp192k1 (18) */ 193 NID_X9_62_prime192v1, /* secp192r1 (19) */ 194 NID_secp224k1, /* secp224k1 (20) */ 195 NID_secp224r1, /* secp224r1 (21) */ 196 NID_secp256k1, /* secp256k1 (22) */ 197 NID_X9_62_prime256v1, /* secp256r1 (23) */ 198 NID_secp384r1, /* secp384r1 (24) */ 199 NID_secp521r1 /* secp521r1 (25) */ 200 }; 201 202 int tls1_ec_curve_id2nid(int curve_id) 203 { 204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 205 if ((curve_id < 1) || ((unsigned int)curve_id > 206 sizeof(nid_list)/sizeof(nid_list[0]))) 207 return 0; 208 return nid_list[curve_id-1]; 209 } 210 211 int tls1_ec_nid2curve_id(int nid) 212 { 213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 214 switch (nid) 215 { 216 case NID_sect163k1: /* sect163k1 (1) */ 217 return 1; 218 case NID_sect163r1: /* sect163r1 (2) */ 219 return 2; 220 case NID_sect163r2: /* sect163r2 (3) */ 221 return 3; 222 case NID_sect193r1: /* sect193r1 (4) */ 223 return 4; 224 case NID_sect193r2: /* sect193r2 (5) */ 225 return 5; 226 case NID_sect233k1: /* sect233k1 (6) */ 227 return 6; 228 case NID_sect233r1: /* sect233r1 (7) */ 229 return 7; 230 case NID_sect239k1: /* sect239k1 (8) */ 231 return 8; 232 case NID_sect283k1: /* sect283k1 (9) */ 233 return 9; 234 case NID_sect283r1: /* sect283r1 (10) */ 235 return 10; 236 case NID_sect409k1: /* sect409k1 (11) */ 237 return 11; 238 case NID_sect409r1: /* sect409r1 (12) */ 239 return 12; 240 case NID_sect571k1: /* sect571k1 (13) */ 241 return 13; 242 case NID_sect571r1: /* sect571r1 (14) */ 243 return 14; 244 case NID_secp160k1: /* secp160k1 (15) */ 245 return 15; 246 case NID_secp160r1: /* secp160r1 (16) */ 247 return 16; 248 case NID_secp160r2: /* secp160r2 (17) */ 249 return 17; 250 case NID_secp192k1: /* secp192k1 (18) */ 251 return 18; 252 case NID_X9_62_prime192v1: /* secp192r1 (19) */ 253 return 19; 254 case NID_secp224k1: /* secp224k1 (20) */ 255 return 20; 256 case NID_secp224r1: /* secp224r1 (21) */ 257 return 21; 258 case NID_secp256k1: /* secp256k1 (22) */ 259 return 22; 260 case NID_X9_62_prime256v1: /* secp256r1 (23) */ 261 return 23; 262 case NID_secp384r1: /* secp384r1 (24) */ 263 return 24; 264 case NID_secp521r1: /* secp521r1 (25) */ 265 return 25; 266 default: 267 return 0; 268 } 269 } 270 #endif /* OPENSSL_NO_EC */ 271 272 #ifndef OPENSSL_NO_TLSEXT 273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 274 { 275 int extdatalen=0; 276 unsigned char *ret = p; 277 278 /* don't add extensions for SSLv3 unless doing secure renegotiation */ 279 if (s->client_version == SSL3_VERSION 280 && !s->s3->send_connection_binding) 281 return p; 282 283 ret+=2; 284 285 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 286 287 if (s->tlsext_hostname != NULL) 288 { 289 /* Add TLS extension servername to the Client Hello message */ 290 unsigned long size_str; 291 long lenmax; 292 293 /* check for enough space. 294 4 for the servername type and entension length 295 2 for servernamelist length 296 1 for the hostname type 297 2 for hostname length 298 + hostname length 299 */ 300 301 if ((lenmax = limit - ret - 9) < 0 302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 303 return NULL; 304 305 /* extension type and length */ 306 s2n(TLSEXT_TYPE_server_name,ret); 307 s2n(size_str+5,ret); 308 309 /* length of servername list */ 310 s2n(size_str+3,ret); 311 312 /* hostname type, length and hostname */ 313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; 314 s2n(size_str,ret); 315 memcpy(ret, s->tlsext_hostname, size_str); 316 ret+=size_str; 317 } 318 319 /* Add RI if renegotiating */ 320 if (s->new_session) 321 { 322 int el; 323 324 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) 325 { 326 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 327 return NULL; 328 } 329 330 if((limit - p - 4 - el) < 0) return NULL; 331 332 s2n(TLSEXT_TYPE_renegotiate,ret); 333 s2n(el,ret); 334 335 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) 336 { 337 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 338 return NULL; 339 } 340 341 ret += el; 342 } 343 344 #ifndef OPENSSL_NO_EC 345 if (s->tlsext_ecpointformatlist != NULL && 346 s->version != DTLS1_VERSION) 347 { 348 /* Add TLS extension ECPointFormats to the ClientHello message */ 349 long lenmax; 350 351 if ((lenmax = limit - ret - 5) < 0) return NULL; 352 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 353 if (s->tlsext_ecpointformatlist_length > 255) 354 { 355 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 356 return NULL; 357 } 358 359 s2n(TLSEXT_TYPE_ec_point_formats,ret); 360 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 361 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 362 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 363 ret+=s->tlsext_ecpointformatlist_length; 364 } 365 if (s->tlsext_ellipticcurvelist != NULL && 366 s->version != DTLS1_VERSION) 367 { 368 /* Add TLS extension EllipticCurves to the ClientHello message */ 369 long lenmax; 370 371 if ((lenmax = limit - ret - 6) < 0) return NULL; 372 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; 373 if (s->tlsext_ellipticcurvelist_length > 65532) 374 { 375 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 376 return NULL; 377 } 378 379 s2n(TLSEXT_TYPE_elliptic_curves,ret); 380 s2n(s->tlsext_ellipticcurvelist_length + 2, ret); 381 382 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for 383 * elliptic_curve_list, but the examples use two bytes. 384 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html 385 * resolves this to two bytes. 386 */ 387 s2n(s->tlsext_ellipticcurvelist_length, ret); 388 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 389 ret+=s->tlsext_ellipticcurvelist_length; 390 } 391 #endif /* OPENSSL_NO_EC */ 392 393 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) 394 { 395 int ticklen; 396 if (!s->new_session && s->session && s->session->tlsext_tick) 397 ticklen = s->session->tlsext_ticklen; 398 else if (s->session && s->tlsext_session_ticket && 399 s->tlsext_session_ticket->data) 400 { 401 ticklen = s->tlsext_session_ticket->length; 402 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 403 if (!s->session->tlsext_tick) 404 return NULL; 405 memcpy(s->session->tlsext_tick, 406 s->tlsext_session_ticket->data, 407 ticklen); 408 s->session->tlsext_ticklen = ticklen; 409 } 410 else 411 ticklen = 0; 412 if (ticklen == 0 && s->tlsext_session_ticket && 413 s->tlsext_session_ticket->data == NULL) 414 goto skip_ext; 415 /* Check for enough room 2 for extension type, 2 for len 416 * rest for ticket 417 */ 418 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; 419 s2n(TLSEXT_TYPE_session_ticket,ret); 420 s2n(ticklen,ret); 421 if (ticklen) 422 { 423 memcpy(ret, s->session->tlsext_tick, ticklen); 424 ret += ticklen; 425 } 426 } 427 skip_ext: 428 429 #ifdef TLSEXT_TYPE_opaque_prf_input 430 if (s->s3->client_opaque_prf_input != NULL && 431 s->version != DTLS1_VERSION) 432 { 433 size_t col = s->s3->client_opaque_prf_input_len; 434 435 if ((long)(limit - ret - 6 - col < 0)) 436 return NULL; 437 if (col > 0xFFFD) /* can't happen */ 438 return NULL; 439 440 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 441 s2n(col + 2, ret); 442 s2n(col, ret); 443 memcpy(ret, s->s3->client_opaque_prf_input, col); 444 ret += col; 445 } 446 #endif 447 448 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && 449 s->version != DTLS1_VERSION) 450 { 451 int i; 452 long extlen, idlen, itmp; 453 OCSP_RESPID *id; 454 455 idlen = 0; 456 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 457 { 458 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 459 itmp = i2d_OCSP_RESPID(id, NULL); 460 if (itmp <= 0) 461 return NULL; 462 idlen += itmp + 2; 463 } 464 465 if (s->tlsext_ocsp_exts) 466 { 467 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); 468 if (extlen < 0) 469 return NULL; 470 } 471 else 472 extlen = 0; 473 474 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; 475 s2n(TLSEXT_TYPE_status_request, ret); 476 if (extlen + idlen > 0xFFF0) 477 return NULL; 478 s2n(extlen + idlen + 5, ret); 479 *(ret++) = TLSEXT_STATUSTYPE_ocsp; 480 s2n(idlen, ret); 481 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 482 { 483 /* save position of id len */ 484 unsigned char *q = ret; 485 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 486 /* skip over id len */ 487 ret += 2; 488 itmp = i2d_OCSP_RESPID(id, &ret); 489 /* write id len */ 490 s2n(itmp, q); 491 } 492 s2n(extlen, ret); 493 if (extlen > 0) 494 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); 495 } 496 497 if ((extdatalen = ret-p-2)== 0) 498 return p; 499 500 s2n(extdatalen,p); 501 return ret; 502 } 503 504 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 505 { 506 int extdatalen=0; 507 unsigned char *ret = p; 508 509 /* don't add extensions for SSLv3, unless doing secure renegotiation */ 510 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) 511 return p; 512 513 ret+=2; 514 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 515 516 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) 517 { 518 if ((long)(limit - ret - 4) < 0) return NULL; 519 520 s2n(TLSEXT_TYPE_server_name,ret); 521 s2n(0,ret); 522 } 523 524 if(s->s3->send_connection_binding) 525 { 526 int el; 527 528 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) 529 { 530 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 531 return NULL; 532 } 533 534 if((limit - p - 4 - el) < 0) return NULL; 535 536 s2n(TLSEXT_TYPE_renegotiate,ret); 537 s2n(el,ret); 538 539 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) 540 { 541 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 542 return NULL; 543 } 544 545 ret += el; 546 } 547 548 #ifndef OPENSSL_NO_EC 549 if (s->tlsext_ecpointformatlist != NULL && 550 s->version != DTLS1_VERSION) 551 { 552 /* Add TLS extension ECPointFormats to the ServerHello message */ 553 long lenmax; 554 555 if ((lenmax = limit - ret - 5) < 0) return NULL; 556 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 557 if (s->tlsext_ecpointformatlist_length > 255) 558 { 559 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 560 return NULL; 561 } 562 563 s2n(TLSEXT_TYPE_ec_point_formats,ret); 564 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 565 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 566 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 567 ret+=s->tlsext_ecpointformatlist_length; 568 569 } 570 /* Currently the server should not respond with a SupportedCurves extension */ 571 #endif /* OPENSSL_NO_EC */ 572 573 if (s->tlsext_ticket_expected 574 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 575 { 576 if ((long)(limit - ret - 4) < 0) return NULL; 577 s2n(TLSEXT_TYPE_session_ticket,ret); 578 s2n(0,ret); 579 } 580 581 if (s->tlsext_status_expected) 582 { 583 if ((long)(limit - ret - 4) < 0) return NULL; 584 s2n(TLSEXT_TYPE_status_request,ret); 585 s2n(0,ret); 586 } 587 588 #ifdef TLSEXT_TYPE_opaque_prf_input 589 if (s->s3->server_opaque_prf_input != NULL && 590 s->version != DTLS1_VERSION) 591 { 592 size_t sol = s->s3->server_opaque_prf_input_len; 593 594 if ((long)(limit - ret - 6 - sol) < 0) 595 return NULL; 596 if (sol > 0xFFFD) /* can't happen */ 597 return NULL; 598 599 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 600 s2n(sol + 2, ret); 601 s2n(sol, ret); 602 memcpy(ret, s->s3->server_opaque_prf_input, sol); 603 ret += sol; 604 } 605 #endif 606 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 607 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) 608 { const unsigned char cryptopro_ext[36] = { 609 0xfd, 0xe8, /*65000*/ 610 0x00, 0x20, /*32 bytes length*/ 611 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 612 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 613 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 614 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; 615 if (limit-ret<36) return NULL; 616 memcpy(ret,cryptopro_ext,36); 617 ret+=36; 618 619 } 620 621 if ((extdatalen = ret-p-2)== 0) 622 return p; 623 624 s2n(extdatalen,p); 625 return ret; 626 } 627 628 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 629 { 630 unsigned short type; 631 unsigned short size; 632 unsigned short len; 633 unsigned char *data = *p; 634 int renegotiate_seen = 0; 635 636 s->servername_done = 0; 637 s->tlsext_status_type = -1; 638 639 if (data >= (d+n-2)) 640 goto ri_check; 641 n2s(data,len); 642 643 if (data > (d+n-len)) 644 goto ri_check; 645 646 while (data <= (d+n-4)) 647 { 648 n2s(data,type); 649 n2s(data,size); 650 651 if (data+size > (d+n)) 652 goto ri_check; 653 #if 0 654 fprintf(stderr,"Received extension type %d size %d\n",type,size); 655 #endif 656 if (s->tlsext_debug_cb) 657 s->tlsext_debug_cb(s, 0, type, data, size, 658 s->tlsext_debug_arg); 659 /* The servername extension is treated as follows: 660 661 - Only the hostname type is supported with a maximum length of 255. 662 - The servername is rejected if too long or if it contains zeros, 663 in which case an fatal alert is generated. 664 - The servername field is maintained together with the session cache. 665 - When a session is resumed, the servername call back invoked in order 666 to allow the application to position itself to the right context. 667 - The servername is acknowledged if it is new for a session or when 668 it is identical to a previously used for the same session. 669 Applications can control the behaviour. They can at any time 670 set a 'desirable' servername for a new SSL object. This can be the 671 case for example with HTTPS when a Host: header field is received and 672 a renegotiation is requested. In this case, a possible servername 673 presented in the new client hello is only acknowledged if it matches 674 the value of the Host: field. 675 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 676 if they provide for changing an explicit servername context for the session, 677 i.e. when the session has been established with a servername extension. 678 - On session reconnect, the servername extension may be absent. 679 680 */ 681 682 if (type == TLSEXT_TYPE_server_name) 683 { 684 unsigned char *sdata; 685 int servname_type; 686 int dsize; 687 688 if (size < 2) 689 { 690 *al = SSL_AD_DECODE_ERROR; 691 return 0; 692 } 693 n2s(data,dsize); 694 size -= 2; 695 if (dsize > size ) 696 { 697 *al = SSL_AD_DECODE_ERROR; 698 return 0; 699 } 700 701 sdata = data; 702 while (dsize > 3) 703 { 704 servname_type = *(sdata++); 705 n2s(sdata,len); 706 dsize -= 3; 707 708 if (len > dsize) 709 { 710 *al = SSL_AD_DECODE_ERROR; 711 return 0; 712 } 713 if (s->servername_done == 0) 714 switch (servname_type) 715 { 716 case TLSEXT_NAMETYPE_host_name: 717 if (!s->hit) 718 { 719 if(s->session->tlsext_hostname) 720 { 721 *al = SSL_AD_DECODE_ERROR; 722 return 0; 723 } 724 if (len > TLSEXT_MAXLEN_host_name) 725 { 726 *al = TLS1_AD_UNRECOGNIZED_NAME; 727 return 0; 728 } 729 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) 730 { 731 *al = TLS1_AD_INTERNAL_ERROR; 732 return 0; 733 } 734 memcpy(s->session->tlsext_hostname, sdata, len); 735 s->session->tlsext_hostname[len]='\0'; 736 if (strlen(s->session->tlsext_hostname) != len) { 737 OPENSSL_free(s->session->tlsext_hostname); 738 s->session->tlsext_hostname = NULL; 739 *al = TLS1_AD_UNRECOGNIZED_NAME; 740 return 0; 741 } 742 s->servername_done = 1; 743 744 } 745 else 746 s->servername_done = s->session->tlsext_hostname 747 && strlen(s->session->tlsext_hostname) == len 748 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; 749 750 break; 751 752 default: 753 break; 754 } 755 756 dsize -= len; 757 } 758 if (dsize != 0) 759 { 760 *al = SSL_AD_DECODE_ERROR; 761 return 0; 762 } 763 764 } 765 766 #ifndef OPENSSL_NO_EC 767 else if (type == TLSEXT_TYPE_ec_point_formats && 768 s->version != DTLS1_VERSION) 769 { 770 unsigned char *sdata = data; 771 int ecpointformatlist_length = *(sdata++); 772 773 if (ecpointformatlist_length != size - 1) 774 { 775 *al = TLS1_AD_DECODE_ERROR; 776 return 0; 777 } 778 if (!s->hit) 779 { 780 if(s->session->tlsext_ecpointformatlist) 781 { 782 OPENSSL_free(s->session->tlsext_ecpointformatlist); 783 s->session->tlsext_ecpointformatlist = NULL; 784 } 785 s->session->tlsext_ecpointformatlist_length = 0; 786 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 787 { 788 *al = TLS1_AD_INTERNAL_ERROR; 789 return 0; 790 } 791 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 792 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 793 } 794 #if 0 795 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); 796 sdata = s->session->tlsext_ecpointformatlist; 797 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 798 fprintf(stderr,"%i ",*(sdata++)); 799 fprintf(stderr,"\n"); 800 #endif 801 } 802 else if (type == TLSEXT_TYPE_elliptic_curves && 803 s->version != DTLS1_VERSION) 804 { 805 unsigned char *sdata = data; 806 int ellipticcurvelist_length = (*(sdata++) << 8); 807 ellipticcurvelist_length += (*(sdata++)); 808 809 if (ellipticcurvelist_length != size - 2) 810 { 811 *al = TLS1_AD_DECODE_ERROR; 812 return 0; 813 } 814 if (!s->hit) 815 { 816 if(s->session->tlsext_ellipticcurvelist) 817 { 818 *al = TLS1_AD_DECODE_ERROR; 819 return 0; 820 } 821 s->session->tlsext_ellipticcurvelist_length = 0; 822 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) 823 { 824 *al = TLS1_AD_INTERNAL_ERROR; 825 return 0; 826 } 827 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; 828 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); 829 } 830 #if 0 831 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); 832 sdata = s->session->tlsext_ellipticcurvelist; 833 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) 834 fprintf(stderr,"%i ",*(sdata++)); 835 fprintf(stderr,"\n"); 836 #endif 837 } 838 #endif /* OPENSSL_NO_EC */ 839 #ifdef TLSEXT_TYPE_opaque_prf_input 840 else if (type == TLSEXT_TYPE_opaque_prf_input && 841 s->version != DTLS1_VERSION) 842 { 843 unsigned char *sdata = data; 844 845 if (size < 2) 846 { 847 *al = SSL_AD_DECODE_ERROR; 848 return 0; 849 } 850 n2s(sdata, s->s3->client_opaque_prf_input_len); 851 if (s->s3->client_opaque_prf_input_len != size - 2) 852 { 853 *al = SSL_AD_DECODE_ERROR; 854 return 0; 855 } 856 857 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 858 OPENSSL_free(s->s3->client_opaque_prf_input); 859 if (s->s3->client_opaque_prf_input_len == 0) 860 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 861 else 862 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); 863 if (s->s3->client_opaque_prf_input == NULL) 864 { 865 *al = TLS1_AD_INTERNAL_ERROR; 866 return 0; 867 } 868 } 869 #endif 870 else if (type == TLSEXT_TYPE_session_ticket) 871 { 872 if (s->tls_session_ticket_ext_cb && 873 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 874 { 875 *al = TLS1_AD_INTERNAL_ERROR; 876 return 0; 877 } 878 } 879 else if (type == TLSEXT_TYPE_renegotiate) 880 { 881 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) 882 return 0; 883 renegotiate_seen = 1; 884 } 885 else if (type == TLSEXT_TYPE_status_request && 886 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) 887 { 888 889 if (size < 5) 890 { 891 *al = SSL_AD_DECODE_ERROR; 892 return 0; 893 } 894 895 s->tlsext_status_type = *data++; 896 size--; 897 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) 898 { 899 const unsigned char *sdata; 900 int dsize; 901 /* Read in responder_id_list */ 902 n2s(data,dsize); 903 size -= 2; 904 if (dsize > size ) 905 { 906 *al = SSL_AD_DECODE_ERROR; 907 return 0; 908 } 909 while (dsize > 0) 910 { 911 OCSP_RESPID *id; 912 int idsize; 913 if (dsize < 4) 914 { 915 *al = SSL_AD_DECODE_ERROR; 916 return 0; 917 } 918 n2s(data, idsize); 919 dsize -= 2 + idsize; 920 size -= 2 + idsize; 921 if (dsize < 0) 922 { 923 *al = SSL_AD_DECODE_ERROR; 924 return 0; 925 } 926 sdata = data; 927 data += idsize; 928 id = d2i_OCSP_RESPID(NULL, 929 &sdata, idsize); 930 if (!id) 931 { 932 *al = SSL_AD_DECODE_ERROR; 933 return 0; 934 } 935 if (data != sdata) 936 { 937 OCSP_RESPID_free(id); 938 *al = SSL_AD_DECODE_ERROR; 939 return 0; 940 } 941 if (!s->tlsext_ocsp_ids 942 && !(s->tlsext_ocsp_ids = 943 sk_OCSP_RESPID_new_null())) 944 { 945 OCSP_RESPID_free(id); 946 *al = SSL_AD_INTERNAL_ERROR; 947 return 0; 948 } 949 if (!sk_OCSP_RESPID_push( 950 s->tlsext_ocsp_ids, id)) 951 { 952 OCSP_RESPID_free(id); 953 *al = SSL_AD_INTERNAL_ERROR; 954 return 0; 955 } 956 } 957 958 /* Read in request_extensions */ 959 if (size < 2) 960 { 961 *al = SSL_AD_DECODE_ERROR; 962 return 0; 963 } 964 n2s(data,dsize); 965 size -= 2; 966 if (dsize != size) 967 { 968 *al = SSL_AD_DECODE_ERROR; 969 return 0; 970 } 971 sdata = data; 972 if (dsize > 0) 973 { 974 if (s->tlsext_ocsp_exts) 975 { 976 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts, 977 X509_EXTENSION_free); 978 } 979 980 s->tlsext_ocsp_exts = 981 d2i_X509_EXTENSIONS(NULL, 982 &sdata, dsize); 983 if (!s->tlsext_ocsp_exts 984 || (data + dsize != sdata)) 985 { 986 *al = SSL_AD_DECODE_ERROR; 987 return 0; 988 } 989 } 990 } 991 /* We don't know what to do with any other type 992 * so ignore it. 993 */ 994 else 995 s->tlsext_status_type = -1; 996 } 997 998 /* session ticket processed earlier */ 999 data+=size; 1000 } 1001 1002 *p = data; 1003 1004 ri_check: 1005 1006 /* Need RI if renegotiating */ 1007 1008 if (!renegotiate_seen && s->new_session && 1009 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1010 { 1011 *al = SSL_AD_HANDSHAKE_FAILURE; 1012 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, 1013 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1014 return 0; 1015 } 1016 1017 return 1; 1018 } 1019 1020 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 1021 { 1022 unsigned short length; 1023 unsigned short type; 1024 unsigned short size; 1025 unsigned char *data = *p; 1026 int tlsext_servername = 0; 1027 int renegotiate_seen = 0; 1028 1029 if (data >= (d+n-2)) 1030 goto ri_check; 1031 1032 n2s(data,length); 1033 if (data+length != d+n) 1034 { 1035 *al = SSL_AD_DECODE_ERROR; 1036 return 0; 1037 } 1038 1039 while(data <= (d+n-4)) 1040 { 1041 n2s(data,type); 1042 n2s(data,size); 1043 1044 if (data+size > (d+n)) 1045 goto ri_check; 1046 1047 if (s->tlsext_debug_cb) 1048 s->tlsext_debug_cb(s, 1, type, data, size, 1049 s->tlsext_debug_arg); 1050 1051 if (type == TLSEXT_TYPE_server_name) 1052 { 1053 if (s->tlsext_hostname == NULL || size > 0) 1054 { 1055 *al = TLS1_AD_UNRECOGNIZED_NAME; 1056 return 0; 1057 } 1058 tlsext_servername = 1; 1059 } 1060 1061 #ifndef OPENSSL_NO_EC 1062 else if (type == TLSEXT_TYPE_ec_point_formats && 1063 s->version != DTLS1_VERSION) 1064 { 1065 unsigned char *sdata = data; 1066 int ecpointformatlist_length = *(sdata++); 1067 1068 if (ecpointformatlist_length != size - 1) 1069 { 1070 *al = TLS1_AD_DECODE_ERROR; 1071 return 0; 1072 } 1073 s->session->tlsext_ecpointformatlist_length = 0; 1074 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 1075 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 1076 { 1077 *al = TLS1_AD_INTERNAL_ERROR; 1078 return 0; 1079 } 1080 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 1081 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 1082 #if 0 1083 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); 1084 sdata = s->session->tlsext_ecpointformatlist; 1085 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1086 fprintf(stderr,"%i ",*(sdata++)); 1087 fprintf(stderr,"\n"); 1088 #endif 1089 } 1090 #endif /* OPENSSL_NO_EC */ 1091 1092 else if (type == TLSEXT_TYPE_session_ticket) 1093 { 1094 if (s->tls_session_ticket_ext_cb && 1095 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1096 { 1097 *al = TLS1_AD_INTERNAL_ERROR; 1098 return 0; 1099 } 1100 if ((SSL_get_options(s) & SSL_OP_NO_TICKET) 1101 || (size > 0)) 1102 { 1103 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1104 return 0; 1105 } 1106 s->tlsext_ticket_expected = 1; 1107 } 1108 #ifdef TLSEXT_TYPE_opaque_prf_input 1109 else if (type == TLSEXT_TYPE_opaque_prf_input && 1110 s->version != DTLS1_VERSION) 1111 { 1112 unsigned char *sdata = data; 1113 1114 if (size < 2) 1115 { 1116 *al = SSL_AD_DECODE_ERROR; 1117 return 0; 1118 } 1119 n2s(sdata, s->s3->server_opaque_prf_input_len); 1120 if (s->s3->server_opaque_prf_input_len != size - 2) 1121 { 1122 *al = SSL_AD_DECODE_ERROR; 1123 return 0; 1124 } 1125 1126 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1127 OPENSSL_free(s->s3->server_opaque_prf_input); 1128 if (s->s3->server_opaque_prf_input_len == 0) 1129 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1130 else 1131 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); 1132 1133 if (s->s3->server_opaque_prf_input == NULL) 1134 { 1135 *al = TLS1_AD_INTERNAL_ERROR; 1136 return 0; 1137 } 1138 } 1139 #endif 1140 else if (type == TLSEXT_TYPE_status_request && 1141 s->version != DTLS1_VERSION) 1142 { 1143 /* MUST be empty and only sent if we've requested 1144 * a status request message. 1145 */ 1146 if ((s->tlsext_status_type == -1) || (size > 0)) 1147 { 1148 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1149 return 0; 1150 } 1151 /* Set flag to expect CertificateStatus message */ 1152 s->tlsext_status_expected = 1; 1153 } 1154 else if (type == TLSEXT_TYPE_renegotiate) 1155 { 1156 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) 1157 return 0; 1158 renegotiate_seen = 1; 1159 } 1160 data+=size; 1161 } 1162 1163 if (data != d+n) 1164 { 1165 *al = SSL_AD_DECODE_ERROR; 1166 return 0; 1167 } 1168 1169 if (!s->hit && tlsext_servername == 1) 1170 { 1171 if (s->tlsext_hostname) 1172 { 1173 if (s->session->tlsext_hostname == NULL) 1174 { 1175 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 1176 if (!s->session->tlsext_hostname) 1177 { 1178 *al = SSL_AD_UNRECOGNIZED_NAME; 1179 return 0; 1180 } 1181 } 1182 else 1183 { 1184 *al = SSL_AD_DECODE_ERROR; 1185 return 0; 1186 } 1187 } 1188 } 1189 1190 *p = data; 1191 1192 ri_check: 1193 1194 /* Determine if we need to see RI. Strictly speaking if we want to 1195 * avoid an attack we should *always* see RI even on initial server 1196 * hello because the client doesn't see any renegotiation during an 1197 * attack. However this would mean we could not connect to any server 1198 * which doesn't support RI so for the immediate future tolerate RI 1199 * absence on initial connect only. 1200 */ 1201 if (!renegotiate_seen 1202 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT) 1203 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1204 { 1205 *al = SSL_AD_HANDSHAKE_FAILURE; 1206 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, 1207 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1208 return 0; 1209 } 1210 1211 return 1; 1212 } 1213 1214 1215 int ssl_prepare_clienthello_tlsext(SSL *s) 1216 { 1217 #ifndef OPENSSL_NO_EC 1218 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 1219 * and elliptic curves we support. 1220 */ 1221 int using_ecc = 0; 1222 int i; 1223 unsigned char *j; 1224 unsigned long alg_k, alg_a; 1225 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); 1226 1227 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) 1228 { 1229 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); 1230 1231 alg_k = c->algorithm_mkey; 1232 alg_a = c->algorithm_auth; 1233 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) 1234 { 1235 using_ecc = 1; 1236 break; 1237 } 1238 } 1239 using_ecc = using_ecc && (s->version == TLS1_VERSION); 1240 if (using_ecc) 1241 { 1242 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1243 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1244 { 1245 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1246 return -1; 1247 } 1248 s->tlsext_ecpointformatlist_length = 3; 1249 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1250 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1251 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1252 1253 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ 1254 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); 1255 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2; 1256 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 1257 { 1258 s->tlsext_ellipticcurvelist_length = 0; 1259 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1260 return -1; 1261 } 1262 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <= 1263 sizeof(nid_list)/sizeof(nid_list[0]); i++) 1264 s2n(i,j); 1265 } 1266 #endif /* OPENSSL_NO_EC */ 1267 1268 #ifdef TLSEXT_TYPE_opaque_prf_input 1269 { 1270 int r = 1; 1271 1272 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1273 { 1274 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1275 if (!r) 1276 return -1; 1277 } 1278 1279 if (s->tlsext_opaque_prf_input != NULL) 1280 { 1281 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 1282 OPENSSL_free(s->s3->client_opaque_prf_input); 1283 1284 if (s->tlsext_opaque_prf_input_len == 0) 1285 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1286 else 1287 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1288 if (s->s3->client_opaque_prf_input == NULL) 1289 { 1290 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1291 return -1; 1292 } 1293 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1294 } 1295 1296 if (r == 2) 1297 /* at callback's request, insist on receiving an appropriate server opaque PRF input */ 1298 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1299 } 1300 #endif 1301 1302 return 1; 1303 } 1304 1305 int ssl_prepare_serverhello_tlsext(SSL *s) 1306 { 1307 #ifndef OPENSSL_NO_EC 1308 /* If we are server and using an ECC cipher suite, send the point formats we support 1309 * if the client sent us an ECPointsFormat extension. Note that the server is not 1310 * supposed to send an EllipticCurves extension. 1311 */ 1312 1313 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1314 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1315 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); 1316 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); 1317 1318 if (using_ecc) 1319 { 1320 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1321 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1322 { 1323 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1324 return -1; 1325 } 1326 s->tlsext_ecpointformatlist_length = 3; 1327 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1328 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1329 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1330 } 1331 #endif /* OPENSSL_NO_EC */ 1332 1333 return 1; 1334 } 1335 1336 int ssl_check_clienthello_tlsext(SSL *s) 1337 { 1338 int ret=SSL_TLSEXT_ERR_NOACK; 1339 int al = SSL_AD_UNRECOGNIZED_NAME; 1340 1341 #ifndef OPENSSL_NO_EC 1342 /* The handling of the ECPointFormats extension is done elsewhere, namely in 1343 * ssl3_choose_cipher in s3_lib.c. 1344 */ 1345 /* The handling of the EllipticCurves extension is done elsewhere, namely in 1346 * ssl3_choose_cipher in s3_lib.c. 1347 */ 1348 #endif 1349 1350 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1351 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1352 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1353 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1354 1355 /* If status request then ask callback what to do. 1356 * Note: this must be called after servername callbacks in case 1357 * the certificate has changed. 1358 */ 1359 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) 1360 { 1361 int r; 1362 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1363 switch (r) 1364 { 1365 /* We don't want to send a status request response */ 1366 case SSL_TLSEXT_ERR_NOACK: 1367 s->tlsext_status_expected = 0; 1368 break; 1369 /* status request response should be sent */ 1370 case SSL_TLSEXT_ERR_OK: 1371 if (s->tlsext_ocsp_resp) 1372 s->tlsext_status_expected = 1; 1373 else 1374 s->tlsext_status_expected = 0; 1375 break; 1376 /* something bad happened */ 1377 case SSL_TLSEXT_ERR_ALERT_FATAL: 1378 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1379 al = SSL_AD_INTERNAL_ERROR; 1380 goto err; 1381 } 1382 } 1383 else 1384 s->tlsext_status_expected = 0; 1385 1386 #ifdef TLSEXT_TYPE_opaque_prf_input 1387 { 1388 /* This sort of belongs into ssl_prepare_serverhello_tlsext(), 1389 * but we might be sending an alert in response to the client hello, 1390 * so this has to happen here in ssl_check_clienthello_tlsext(). */ 1391 1392 int r = 1; 1393 1394 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1395 { 1396 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1397 if (!r) 1398 { 1399 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1400 al = SSL_AD_INTERNAL_ERROR; 1401 goto err; 1402 } 1403 } 1404 1405 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1406 OPENSSL_free(s->s3->server_opaque_prf_input); 1407 s->s3->server_opaque_prf_input = NULL; 1408 1409 if (s->tlsext_opaque_prf_input != NULL) 1410 { 1411 if (s->s3->client_opaque_prf_input != NULL && 1412 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) 1413 { 1414 /* can only use this extension if we have a server opaque PRF input 1415 * of the same length as the client opaque PRF input! */ 1416 1417 if (s->tlsext_opaque_prf_input_len == 0) 1418 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1419 else 1420 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1421 if (s->s3->server_opaque_prf_input == NULL) 1422 { 1423 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1424 al = SSL_AD_INTERNAL_ERROR; 1425 goto err; 1426 } 1427 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1428 } 1429 } 1430 1431 if (r == 2 && s->s3->server_opaque_prf_input == NULL) 1432 { 1433 /* The callback wants to enforce use of the extension, 1434 * but we can't do that with the client opaque PRF input; 1435 * abort the handshake. 1436 */ 1437 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1438 al = SSL_AD_HANDSHAKE_FAILURE; 1439 } 1440 } 1441 1442 #endif 1443 err: 1444 switch (ret) 1445 { 1446 case SSL_TLSEXT_ERR_ALERT_FATAL: 1447 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1448 return -1; 1449 1450 case SSL_TLSEXT_ERR_ALERT_WARNING: 1451 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1452 return 1; 1453 1454 case SSL_TLSEXT_ERR_NOACK: 1455 s->servername_done=0; 1456 default: 1457 return 1; 1458 } 1459 } 1460 1461 int ssl_check_serverhello_tlsext(SSL *s) 1462 { 1463 int ret=SSL_TLSEXT_ERR_NOACK; 1464 int al = SSL_AD_UNRECOGNIZED_NAME; 1465 1466 #ifndef OPENSSL_NO_EC 1467 /* If we are client and using an elliptic curve cryptography cipher 1468 * suite, then if server returns an EC point formats lists extension 1469 * it must contain uncompressed. 1470 */ 1471 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1472 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1473 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 1474 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) && 1475 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) 1476 { 1477 /* we are using an ECC cipher */ 1478 size_t i; 1479 unsigned char *list; 1480 int found_uncompressed = 0; 1481 list = s->session->tlsext_ecpointformatlist; 1482 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1483 { 1484 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) 1485 { 1486 found_uncompressed = 1; 1487 break; 1488 } 1489 } 1490 if (!found_uncompressed) 1491 { 1492 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1493 return -1; 1494 } 1495 } 1496 ret = SSL_TLSEXT_ERR_OK; 1497 #endif /* OPENSSL_NO_EC */ 1498 1499 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1500 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1501 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1502 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1503 1504 #ifdef TLSEXT_TYPE_opaque_prf_input 1505 if (s->s3->server_opaque_prf_input_len > 0) 1506 { 1507 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. 1508 * So first verify that we really have a value from the server too. */ 1509 1510 if (s->s3->server_opaque_prf_input == NULL) 1511 { 1512 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1513 al = SSL_AD_HANDSHAKE_FAILURE; 1514 } 1515 1516 /* Anytime the server *has* sent an opaque PRF input, we need to check 1517 * that we have a client opaque PRF input of the same size. */ 1518 if (s->s3->client_opaque_prf_input == NULL || 1519 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) 1520 { 1521 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1522 al = SSL_AD_ILLEGAL_PARAMETER; 1523 } 1524 } 1525 #endif 1526 1527 /* If we've requested certificate status and we wont get one 1528 * tell the callback 1529 */ 1530 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) 1531 && s->ctx && s->ctx->tlsext_status_cb) 1532 { 1533 int r; 1534 /* Set resp to NULL, resplen to -1 so callback knows 1535 * there is no response. 1536 */ 1537 if (s->tlsext_ocsp_resp) 1538 { 1539 OPENSSL_free(s->tlsext_ocsp_resp); 1540 s->tlsext_ocsp_resp = NULL; 1541 } 1542 s->tlsext_ocsp_resplen = -1; 1543 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1544 if (r == 0) 1545 { 1546 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1547 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1548 } 1549 if (r < 0) 1550 { 1551 al = SSL_AD_INTERNAL_ERROR; 1552 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1553 } 1554 } 1555 1556 switch (ret) 1557 { 1558 case SSL_TLSEXT_ERR_ALERT_FATAL: 1559 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1560 return -1; 1561 1562 case SSL_TLSEXT_ERR_ALERT_WARNING: 1563 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1564 return 1; 1565 1566 case SSL_TLSEXT_ERR_NOACK: 1567 s->servername_done=0; 1568 default: 1569 return 1; 1570 } 1571 } 1572 1573 /* Since the server cache lookup is done early on in the processing of client 1574 * hello and other operations depend on the result we need to handle any TLS 1575 * session ticket extension at the same time. 1576 */ 1577 1578 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, 1579 const unsigned char *limit, SSL_SESSION **ret) 1580 { 1581 /* Point after session ID in client hello */ 1582 const unsigned char *p = session_id + len; 1583 unsigned short i; 1584 1585 /* If tickets disabled behave as if no ticket present 1586 * to permit stateful resumption. 1587 */ 1588 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1589 return 1; 1590 1591 if ((s->version <= SSL3_VERSION) || !limit) 1592 return 1; 1593 if (p >= limit) 1594 return -1; 1595 /* Skip past DTLS cookie */ 1596 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1597 { 1598 i = *(p++); 1599 p+= i; 1600 if (p >= limit) 1601 return -1; 1602 } 1603 /* Skip past cipher list */ 1604 n2s(p, i); 1605 p+= i; 1606 if (p >= limit) 1607 return -1; 1608 /* Skip past compression algorithm list */ 1609 i = *(p++); 1610 p += i; 1611 if (p > limit) 1612 return -1; 1613 /* Now at start of extensions */ 1614 if ((p + 2) >= limit) 1615 return 1; 1616 n2s(p, i); 1617 while ((p + 4) <= limit) 1618 { 1619 unsigned short type, size; 1620 n2s(p, type); 1621 n2s(p, size); 1622 if (p + size > limit) 1623 return 1; 1624 if (type == TLSEXT_TYPE_session_ticket) 1625 { 1626 /* If tickets disabled indicate cache miss which will 1627 * trigger a full handshake 1628 */ 1629 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1630 return 1; 1631 /* If zero length note client will accept a ticket 1632 * and indicate cache miss to trigger full handshake 1633 */ 1634 if (size == 0) 1635 { 1636 s->tlsext_ticket_expected = 1; 1637 return 0; /* Cache miss */ 1638 } 1639 if (s->tls_session_secret_cb) 1640 { 1641 /* Indicate cache miss here and instead of 1642 * generating the session from ticket now, 1643 * trigger abbreviated handshake based on 1644 * external mechanism to calculate the master 1645 * secret later. */ 1646 return 0; 1647 } 1648 return tls_decrypt_ticket(s, p, size, session_id, len, 1649 ret); 1650 } 1651 p += size; 1652 } 1653 return 1; 1654 } 1655 1656 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1657 const unsigned char *sess_id, int sesslen, 1658 SSL_SESSION **psess) 1659 { 1660 SSL_SESSION *sess; 1661 unsigned char *sdec; 1662 const unsigned char *p; 1663 int slen, mlen, renew_ticket = 0; 1664 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1665 HMAC_CTX hctx; 1666 EVP_CIPHER_CTX ctx; 1667 SSL_CTX *tctx = s->initial_ctx; 1668 /* Need at least keyname + iv + some encrypted data */ 1669 if (eticklen < 48) 1670 goto tickerr; 1671 /* Initialize session ticket encryption and HMAC contexts */ 1672 HMAC_CTX_init(&hctx); 1673 EVP_CIPHER_CTX_init(&ctx); 1674 if (tctx->tlsext_ticket_key_cb) 1675 { 1676 unsigned char *nctick = (unsigned char *)etick; 1677 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, 1678 &ctx, &hctx, 0); 1679 if (rv < 0) 1680 return -1; 1681 if (rv == 0) 1682 goto tickerr; 1683 if (rv == 2) 1684 renew_ticket = 1; 1685 } 1686 else 1687 { 1688 /* Check key name matches */ 1689 if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) 1690 goto tickerr; 1691 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1692 tlsext_tick_md(), NULL); 1693 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1694 tctx->tlsext_tick_aes_key, etick + 16); 1695 } 1696 /* Attempt to process session ticket, first conduct sanity and 1697 * integrity checks on ticket. 1698 */ 1699 mlen = HMAC_size(&hctx); 1700 if (mlen < 0) 1701 { 1702 EVP_CIPHER_CTX_cleanup(&ctx); 1703 return -1; 1704 } 1705 eticklen -= mlen; 1706 /* Check HMAC of encrypted ticket */ 1707 HMAC_Update(&hctx, etick, eticklen); 1708 HMAC_Final(&hctx, tick_hmac, NULL); 1709 HMAC_CTX_cleanup(&hctx); 1710 if (memcmp(tick_hmac, etick + eticklen, mlen)) 1711 goto tickerr; 1712 /* Attempt to decrypt session data */ 1713 /* Move p after IV to start of encrypted ticket, update length */ 1714 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1715 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1716 sdec = OPENSSL_malloc(eticklen); 1717 if (!sdec) 1718 { 1719 EVP_CIPHER_CTX_cleanup(&ctx); 1720 return -1; 1721 } 1722 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); 1723 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) 1724 goto tickerr; 1725 slen += mlen; 1726 EVP_CIPHER_CTX_cleanup(&ctx); 1727 p = sdec; 1728 1729 sess = d2i_SSL_SESSION(NULL, &p, slen); 1730 OPENSSL_free(sdec); 1731 if (sess) 1732 { 1733 /* The session ID if non-empty is used by some clients to 1734 * detect that the ticket has been accepted. So we copy it to 1735 * the session structure. If it is empty set length to zero 1736 * as required by standard. 1737 */ 1738 if (sesslen) 1739 memcpy(sess->session_id, sess_id, sesslen); 1740 sess->session_id_length = sesslen; 1741 *psess = sess; 1742 s->tlsext_ticket_expected = renew_ticket; 1743 return 1; 1744 } 1745 /* If session decrypt failure indicate a cache miss and set state to 1746 * send a new ticket 1747 */ 1748 tickerr: 1749 s->tlsext_ticket_expected = 1; 1750 return 0; 1751 } 1752 1753 #endif 1754