t1_lib.c revision 1.3
1 /* ssl/t1_lib.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core (at) openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) cryptsoft.com). 109 * 110 */ 111 112 #include <stdio.h> 113 #include <openssl/objects.h> 114 #include <openssl/evp.h> 115 #include <openssl/hmac.h> 116 #include <openssl/ocsp.h> 117 #include "ssl_locl.h" 118 119 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT; 120 121 #ifndef OPENSSL_NO_TLSEXT 122 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, 123 const unsigned char *sess_id, int sesslen, 124 SSL_SESSION **psess); 125 #endif 126 127 SSL3_ENC_METHOD TLSv1_enc_data={ 128 tls1_enc, 129 tls1_mac, 130 tls1_setup_key_block, 131 tls1_generate_master_secret, 132 tls1_change_cipher_state, 133 tls1_final_finish_mac, 134 TLS1_FINISH_MAC_LENGTH, 135 tls1_cert_verify_mac, 136 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE, 137 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE, 138 tls1_alert_code, 139 }; 140 141 long tls1_default_timeout(void) 142 { 143 /* 2 hours, the 24 hours mentioned in the TLSv1 spec 144 * is way too long for http, the cache would over fill */ 145 return(60*60*2); 146 } 147 148 int tls1_new(SSL *s) 149 { 150 if (!ssl3_new(s)) return(0); 151 s->method->ssl_clear(s); 152 return(1); 153 } 154 155 void tls1_free(SSL *s) 156 { 157 #ifndef OPENSSL_NO_TLSEXT 158 if (s->tlsext_session_ticket) 159 { 160 OPENSSL_free(s->tlsext_session_ticket); 161 } 162 #endif /* OPENSSL_NO_TLSEXT */ 163 ssl3_free(s); 164 } 165 166 void tls1_clear(SSL *s) 167 { 168 ssl3_clear(s); 169 s->version = s->method->version; 170 } 171 172 #ifndef OPENSSL_NO_EC 173 static int nid_list[] = 174 { 175 NID_sect163k1, /* sect163k1 (1) */ 176 NID_sect163r1, /* sect163r1 (2) */ 177 NID_sect163r2, /* sect163r2 (3) */ 178 NID_sect193r1, /* sect193r1 (4) */ 179 NID_sect193r2, /* sect193r2 (5) */ 180 NID_sect233k1, /* sect233k1 (6) */ 181 NID_sect233r1, /* sect233r1 (7) */ 182 NID_sect239k1, /* sect239k1 (8) */ 183 NID_sect283k1, /* sect283k1 (9) */ 184 NID_sect283r1, /* sect283r1 (10) */ 185 NID_sect409k1, /* sect409k1 (11) */ 186 NID_sect409r1, /* sect409r1 (12) */ 187 NID_sect571k1, /* sect571k1 (13) */ 188 NID_sect571r1, /* sect571r1 (14) */ 189 NID_secp160k1, /* secp160k1 (15) */ 190 NID_secp160r1, /* secp160r1 (16) */ 191 NID_secp160r2, /* secp160r2 (17) */ 192 NID_secp192k1, /* secp192k1 (18) */ 193 NID_X9_62_prime192v1, /* secp192r1 (19) */ 194 NID_secp224k1, /* secp224k1 (20) */ 195 NID_secp224r1, /* secp224r1 (21) */ 196 NID_secp256k1, /* secp256k1 (22) */ 197 NID_X9_62_prime256v1, /* secp256r1 (23) */ 198 NID_secp384r1, /* secp384r1 (24) */ 199 NID_secp521r1 /* secp521r1 (25) */ 200 }; 201 202 int tls1_ec_curve_id2nid(int curve_id) 203 { 204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 205 if ((curve_id < 1) || ((unsigned int)curve_id > 206 sizeof(nid_list)/sizeof(nid_list[0]))) 207 return 0; 208 return nid_list[curve_id-1]; 209 } 210 211 int tls1_ec_nid2curve_id(int nid) 212 { 213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 214 switch (nid) 215 { 216 case NID_sect163k1: /* sect163k1 (1) */ 217 return 1; 218 case NID_sect163r1: /* sect163r1 (2) */ 219 return 2; 220 case NID_sect163r2: /* sect163r2 (3) */ 221 return 3; 222 case NID_sect193r1: /* sect193r1 (4) */ 223 return 4; 224 case NID_sect193r2: /* sect193r2 (5) */ 225 return 5; 226 case NID_sect233k1: /* sect233k1 (6) */ 227 return 6; 228 case NID_sect233r1: /* sect233r1 (7) */ 229 return 7; 230 case NID_sect239k1: /* sect239k1 (8) */ 231 return 8; 232 case NID_sect283k1: /* sect283k1 (9) */ 233 return 9; 234 case NID_sect283r1: /* sect283r1 (10) */ 235 return 10; 236 case NID_sect409k1: /* sect409k1 (11) */ 237 return 11; 238 case NID_sect409r1: /* sect409r1 (12) */ 239 return 12; 240 case NID_sect571k1: /* sect571k1 (13) */ 241 return 13; 242 case NID_sect571r1: /* sect571r1 (14) */ 243 return 14; 244 case NID_secp160k1: /* secp160k1 (15) */ 245 return 15; 246 case NID_secp160r1: /* secp160r1 (16) */ 247 return 16; 248 case NID_secp160r2: /* secp160r2 (17) */ 249 return 17; 250 case NID_secp192k1: /* secp192k1 (18) */ 251 return 18; 252 case NID_X9_62_prime192v1: /* secp192r1 (19) */ 253 return 19; 254 case NID_secp224k1: /* secp224k1 (20) */ 255 return 20; 256 case NID_secp224r1: /* secp224r1 (21) */ 257 return 21; 258 case NID_secp256k1: /* secp256k1 (22) */ 259 return 22; 260 case NID_X9_62_prime256v1: /* secp256r1 (23) */ 261 return 23; 262 case NID_secp384r1: /* secp384r1 (24) */ 263 return 24; 264 case NID_secp521r1: /* secp521r1 (25) */ 265 return 25; 266 default: 267 return 0; 268 } 269 } 270 #endif /* OPENSSL_NO_EC */ 271 272 #ifndef OPENSSL_NO_TLSEXT 273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 274 { 275 int extdatalen=0; 276 unsigned char *ret = p; 277 278 /* don't add extensions for SSLv3 unless doing secure renegotiation */ 279 if (s->client_version == SSL3_VERSION 280 && !s->s3->send_connection_binding) 281 return p; 282 283 ret+=2; 284 285 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 286 287 if (s->tlsext_hostname != NULL) 288 { 289 /* Add TLS extension servername to the Client Hello message */ 290 unsigned long size_str; 291 long lenmax; 292 293 /* check for enough space. 294 4 for the servername type and entension length 295 2 for servernamelist length 296 1 for the hostname type 297 2 for hostname length 298 + hostname length 299 */ 300 301 if ((lenmax = limit - ret - 9) < 0 302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 303 return NULL; 304 305 /* extension type and length */ 306 s2n(TLSEXT_TYPE_server_name,ret); 307 s2n(size_str+5,ret); 308 309 /* length of servername list */ 310 s2n(size_str+3,ret); 311 312 /* hostname type, length and hostname */ 313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name; 314 s2n(size_str,ret); 315 memcpy(ret, s->tlsext_hostname, size_str); 316 ret+=size_str; 317 } 318 319 /* Add the renegotiation option: TODOEKR switch */ 320 { 321 int el; 322 323 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) 324 { 325 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 326 return NULL; 327 } 328 329 if((limit - p - 4 - el) < 0) return NULL; 330 331 s2n(TLSEXT_TYPE_renegotiate,ret); 332 s2n(el,ret); 333 334 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) 335 { 336 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 337 return NULL; 338 } 339 340 ret += el; 341 } 342 343 #ifndef OPENSSL_NO_EC 344 if (s->tlsext_ecpointformatlist != NULL && 345 s->version != DTLS1_VERSION) 346 { 347 /* Add TLS extension ECPointFormats to the ClientHello message */ 348 long lenmax; 349 350 if ((lenmax = limit - ret - 5) < 0) return NULL; 351 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 352 if (s->tlsext_ecpointformatlist_length > 255) 353 { 354 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 355 return NULL; 356 } 357 358 s2n(TLSEXT_TYPE_ec_point_formats,ret); 359 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 360 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 361 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 362 ret+=s->tlsext_ecpointformatlist_length; 363 } 364 if (s->tlsext_ellipticcurvelist != NULL && 365 s->version != DTLS1_VERSION) 366 { 367 /* Add TLS extension EllipticCurves to the ClientHello message */ 368 long lenmax; 369 370 if ((lenmax = limit - ret - 6) < 0) return NULL; 371 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL; 372 if (s->tlsext_ellipticcurvelist_length > 65532) 373 { 374 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 375 return NULL; 376 } 377 378 s2n(TLSEXT_TYPE_elliptic_curves,ret); 379 s2n(s->tlsext_ellipticcurvelist_length + 2, ret); 380 381 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for 382 * elliptic_curve_list, but the examples use two bytes. 383 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html 384 * resolves this to two bytes. 385 */ 386 s2n(s->tlsext_ellipticcurvelist_length, ret); 387 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length); 388 ret+=s->tlsext_ellipticcurvelist_length; 389 } 390 #endif /* OPENSSL_NO_EC */ 391 392 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) 393 { 394 int ticklen; 395 if (!s->new_session && s->session && s->session->tlsext_tick) 396 ticklen = s->session->tlsext_ticklen; 397 else if (s->session && s->tlsext_session_ticket && 398 s->tlsext_session_ticket->data) 399 { 400 ticklen = s->tlsext_session_ticket->length; 401 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 402 if (!s->session->tlsext_tick) 403 return NULL; 404 memcpy(s->session->tlsext_tick, 405 s->tlsext_session_ticket->data, 406 ticklen); 407 s->session->tlsext_ticklen = ticklen; 408 } 409 else 410 ticklen = 0; 411 if (ticklen == 0 && s->tlsext_session_ticket && 412 s->tlsext_session_ticket->data == NULL) 413 goto skip_ext; 414 /* Check for enough room 2 for extension type, 2 for len 415 * rest for ticket 416 */ 417 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL; 418 s2n(TLSEXT_TYPE_session_ticket,ret); 419 s2n(ticklen,ret); 420 if (ticklen) 421 { 422 memcpy(ret, s->session->tlsext_tick, ticklen); 423 ret += ticklen; 424 } 425 } 426 skip_ext: 427 428 #ifdef TLSEXT_TYPE_opaque_prf_input 429 if (s->s3->client_opaque_prf_input != NULL && 430 s->version != DTLS1_VERSION) 431 { 432 size_t col = s->s3->client_opaque_prf_input_len; 433 434 if ((long)(limit - ret - 6 - col < 0)) 435 return NULL; 436 if (col > 0xFFFD) /* can't happen */ 437 return NULL; 438 439 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 440 s2n(col + 2, ret); 441 s2n(col, ret); 442 memcpy(ret, s->s3->client_opaque_prf_input, col); 443 ret += col; 444 } 445 #endif 446 447 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp && 448 s->version != DTLS1_VERSION) 449 { 450 int i; 451 long extlen, idlen, itmp; 452 OCSP_RESPID *id; 453 454 idlen = 0; 455 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 456 { 457 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 458 itmp = i2d_OCSP_RESPID(id, NULL); 459 if (itmp <= 0) 460 return NULL; 461 idlen += itmp + 2; 462 } 463 464 if (s->tlsext_ocsp_exts) 465 { 466 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL); 467 if (extlen < 0) 468 return NULL; 469 } 470 else 471 extlen = 0; 472 473 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL; 474 s2n(TLSEXT_TYPE_status_request, ret); 475 if (extlen + idlen > 0xFFF0) 476 return NULL; 477 s2n(extlen + idlen + 5, ret); 478 *(ret++) = TLSEXT_STATUSTYPE_ocsp; 479 s2n(idlen, ret); 480 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) 481 { 482 /* save position of id len */ 483 unsigned char *q = ret; 484 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i); 485 /* skip over id len */ 486 ret += 2; 487 itmp = i2d_OCSP_RESPID(id, &ret); 488 /* write id len */ 489 s2n(itmp, q); 490 } 491 s2n(extlen, ret); 492 if (extlen > 0) 493 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret); 494 } 495 496 if ((extdatalen = ret-p-2)== 0) 497 return p; 498 499 s2n(extdatalen,p); 500 return ret; 501 } 502 503 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit) 504 { 505 int extdatalen=0; 506 unsigned char *ret = p; 507 508 /* don't add extensions for SSLv3, unless doing secure renegotiation */ 509 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding) 510 return p; 511 512 ret+=2; 513 if (ret>=limit) return NULL; /* this really never occurs, but ... */ 514 515 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL) 516 { 517 if ((long)(limit - ret - 4) < 0) return NULL; 518 519 s2n(TLSEXT_TYPE_server_name,ret); 520 s2n(0,ret); 521 } 522 523 if(s->s3->send_connection_binding) 524 { 525 int el; 526 527 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) 528 { 529 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 530 return NULL; 531 } 532 533 if((limit - p - 4 - el) < 0) return NULL; 534 535 s2n(TLSEXT_TYPE_renegotiate,ret); 536 s2n(el,ret); 537 538 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) 539 { 540 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 541 return NULL; 542 } 543 544 ret += el; 545 } 546 547 #ifndef OPENSSL_NO_EC 548 if (s->tlsext_ecpointformatlist != NULL && 549 s->version != DTLS1_VERSION) 550 { 551 /* Add TLS extension ECPointFormats to the ServerHello message */ 552 long lenmax; 553 554 if ((lenmax = limit - ret - 5) < 0) return NULL; 555 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL; 556 if (s->tlsext_ecpointformatlist_length > 255) 557 { 558 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR); 559 return NULL; 560 } 561 562 s2n(TLSEXT_TYPE_ec_point_formats,ret); 563 s2n(s->tlsext_ecpointformatlist_length + 1,ret); 564 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length; 565 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length); 566 ret+=s->tlsext_ecpointformatlist_length; 567 568 } 569 /* Currently the server should not respond with a SupportedCurves extension */ 570 #endif /* OPENSSL_NO_EC */ 571 572 if (s->tlsext_ticket_expected 573 && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 574 { 575 if ((long)(limit - ret - 4) < 0) return NULL; 576 s2n(TLSEXT_TYPE_session_ticket,ret); 577 s2n(0,ret); 578 } 579 580 if (s->tlsext_status_expected) 581 { 582 if ((long)(limit - ret - 4) < 0) return NULL; 583 s2n(TLSEXT_TYPE_status_request,ret); 584 s2n(0,ret); 585 } 586 587 #ifdef TLSEXT_TYPE_opaque_prf_input 588 if (s->s3->server_opaque_prf_input != NULL && 589 s->version != DTLS1_VERSION) 590 { 591 size_t sol = s->s3->server_opaque_prf_input_len; 592 593 if ((long)(limit - ret - 6 - sol) < 0) 594 return NULL; 595 if (sol > 0xFFFD) /* can't happen */ 596 return NULL; 597 598 s2n(TLSEXT_TYPE_opaque_prf_input, ret); 599 s2n(sol + 2, ret); 600 s2n(sol, ret); 601 memcpy(ret, s->s3->server_opaque_prf_input, sol); 602 ret += sol; 603 } 604 #endif 605 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 606 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) 607 { const unsigned char cryptopro_ext[36] = { 608 0xfd, 0xe8, /*65000*/ 609 0x00, 0x20, /*32 bytes length*/ 610 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 611 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 612 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 613 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17}; 614 if (limit-ret<36) return NULL; 615 memcpy(ret,cryptopro_ext,36); 616 ret+=36; 617 618 } 619 620 if ((extdatalen = ret-p-2)== 0) 621 return p; 622 623 s2n(extdatalen,p); 624 return ret; 625 } 626 627 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 628 { 629 unsigned short type; 630 unsigned short size; 631 unsigned short len; 632 unsigned char *data = *p; 633 int renegotiate_seen = 0; 634 635 s->servername_done = 0; 636 s->tlsext_status_type = -1; 637 638 if (data >= (d+n-2)) 639 goto ri_check; 640 n2s(data,len); 641 642 if (data > (d+n-len)) 643 goto ri_check; 644 645 while (data <= (d+n-4)) 646 { 647 n2s(data,type); 648 n2s(data,size); 649 650 if (data+size > (d+n)) 651 goto ri_check; 652 #if 0 653 fprintf(stderr,"Received extension type %d size %d\n",type,size); 654 #endif 655 if (s->tlsext_debug_cb) 656 s->tlsext_debug_cb(s, 0, type, data, size, 657 s->tlsext_debug_arg); 658 /* The servername extension is treated as follows: 659 660 - Only the hostname type is supported with a maximum length of 255. 661 - The servername is rejected if too long or if it contains zeros, 662 in which case an fatal alert is generated. 663 - The servername field is maintained together with the session cache. 664 - When a session is resumed, the servername call back invoked in order 665 to allow the application to position itself to the right context. 666 - The servername is acknowledged if it is new for a session or when 667 it is identical to a previously used for the same session. 668 Applications can control the behaviour. They can at any time 669 set a 'desirable' servername for a new SSL object. This can be the 670 case for example with HTTPS when a Host: header field is received and 671 a renegotiation is requested. In this case, a possible servername 672 presented in the new client hello is only acknowledged if it matches 673 the value of the Host: field. 674 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION 675 if they provide for changing an explicit servername context for the session, 676 i.e. when the session has been established with a servername extension. 677 - On session reconnect, the servername extension may be absent. 678 679 */ 680 681 if (type == TLSEXT_TYPE_server_name) 682 { 683 unsigned char *sdata; 684 int servname_type; 685 int dsize; 686 687 if (size < 2) 688 { 689 *al = SSL_AD_DECODE_ERROR; 690 return 0; 691 } 692 n2s(data,dsize); 693 size -= 2; 694 if (dsize > size ) 695 { 696 *al = SSL_AD_DECODE_ERROR; 697 return 0; 698 } 699 700 sdata = data; 701 while (dsize > 3) 702 { 703 servname_type = *(sdata++); 704 n2s(sdata,len); 705 dsize -= 3; 706 707 if (len > dsize) 708 { 709 *al = SSL_AD_DECODE_ERROR; 710 return 0; 711 } 712 if (s->servername_done == 0) 713 switch (servname_type) 714 { 715 case TLSEXT_NAMETYPE_host_name: 716 if (!s->hit) 717 { 718 if(s->session->tlsext_hostname) 719 { 720 *al = SSL_AD_DECODE_ERROR; 721 return 0; 722 } 723 if (len > TLSEXT_MAXLEN_host_name) 724 { 725 *al = TLS1_AD_UNRECOGNIZED_NAME; 726 return 0; 727 } 728 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL) 729 { 730 *al = TLS1_AD_INTERNAL_ERROR; 731 return 0; 732 } 733 memcpy(s->session->tlsext_hostname, sdata, len); 734 s->session->tlsext_hostname[len]='\0'; 735 if (strlen(s->session->tlsext_hostname) != len) { 736 OPENSSL_free(s->session->tlsext_hostname); 737 s->session->tlsext_hostname = NULL; 738 *al = TLS1_AD_UNRECOGNIZED_NAME; 739 return 0; 740 } 741 s->servername_done = 1; 742 743 } 744 else 745 s->servername_done = s->session->tlsext_hostname 746 && strlen(s->session->tlsext_hostname) == len 747 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0; 748 749 break; 750 751 default: 752 break; 753 } 754 755 dsize -= len; 756 } 757 if (dsize != 0) 758 { 759 *al = SSL_AD_DECODE_ERROR; 760 return 0; 761 } 762 763 } 764 765 #ifndef OPENSSL_NO_EC 766 else if (type == TLSEXT_TYPE_ec_point_formats && 767 s->version != DTLS1_VERSION) 768 { 769 unsigned char *sdata = data; 770 int ecpointformatlist_length = *(sdata++); 771 772 if (ecpointformatlist_length != size - 1) 773 { 774 *al = TLS1_AD_DECODE_ERROR; 775 return 0; 776 } 777 if (!s->hit) 778 { 779 if(s->session->tlsext_ecpointformatlist) 780 { 781 OPENSSL_free(s->session->tlsext_ecpointformatlist); 782 s->session->tlsext_ecpointformatlist = NULL; 783 } 784 s->session->tlsext_ecpointformatlist_length = 0; 785 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 786 { 787 *al = TLS1_AD_INTERNAL_ERROR; 788 return 0; 789 } 790 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 791 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 792 } 793 #if 0 794 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length); 795 sdata = s->session->tlsext_ecpointformatlist; 796 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 797 fprintf(stderr,"%i ",*(sdata++)); 798 fprintf(stderr,"\n"); 799 #endif 800 } 801 else if (type == TLSEXT_TYPE_elliptic_curves && 802 s->version != DTLS1_VERSION) 803 { 804 unsigned char *sdata = data; 805 int ellipticcurvelist_length = (*(sdata++) << 8); 806 ellipticcurvelist_length += (*(sdata++)); 807 808 if (ellipticcurvelist_length != size - 2) 809 { 810 *al = TLS1_AD_DECODE_ERROR; 811 return 0; 812 } 813 if (!s->hit) 814 { 815 if(s->session->tlsext_ellipticcurvelist) 816 { 817 *al = TLS1_AD_DECODE_ERROR; 818 return 0; 819 } 820 s->session->tlsext_ellipticcurvelist_length = 0; 821 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL) 822 { 823 *al = TLS1_AD_INTERNAL_ERROR; 824 return 0; 825 } 826 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length; 827 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length); 828 } 829 #if 0 830 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length); 831 sdata = s->session->tlsext_ellipticcurvelist; 832 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++) 833 fprintf(stderr,"%i ",*(sdata++)); 834 fprintf(stderr,"\n"); 835 #endif 836 } 837 #endif /* OPENSSL_NO_EC */ 838 #ifdef TLSEXT_TYPE_opaque_prf_input 839 else if (type == TLSEXT_TYPE_opaque_prf_input && 840 s->version != DTLS1_VERSION) 841 { 842 unsigned char *sdata = data; 843 844 if (size < 2) 845 { 846 *al = SSL_AD_DECODE_ERROR; 847 return 0; 848 } 849 n2s(sdata, s->s3->client_opaque_prf_input_len); 850 if (s->s3->client_opaque_prf_input_len != size - 2) 851 { 852 *al = SSL_AD_DECODE_ERROR; 853 return 0; 854 } 855 856 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 857 OPENSSL_free(s->s3->client_opaque_prf_input); 858 if (s->s3->client_opaque_prf_input_len == 0) 859 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 860 else 861 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len); 862 if (s->s3->client_opaque_prf_input == NULL) 863 { 864 *al = TLS1_AD_INTERNAL_ERROR; 865 return 0; 866 } 867 } 868 #endif 869 else if (type == TLSEXT_TYPE_session_ticket) 870 { 871 if (s->tls_session_ticket_ext_cb && 872 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 873 { 874 *al = TLS1_AD_INTERNAL_ERROR; 875 return 0; 876 } 877 } 878 else if (type == TLSEXT_TYPE_renegotiate) 879 { 880 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al)) 881 return 0; 882 renegotiate_seen = 1; 883 } 884 else if (type == TLSEXT_TYPE_status_request && 885 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb) 886 { 887 888 if (size < 5) 889 { 890 *al = SSL_AD_DECODE_ERROR; 891 return 0; 892 } 893 894 s->tlsext_status_type = *data++; 895 size--; 896 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) 897 { 898 const unsigned char *sdata; 899 int dsize; 900 /* Read in responder_id_list */ 901 n2s(data,dsize); 902 size -= 2; 903 if (dsize > size ) 904 { 905 *al = SSL_AD_DECODE_ERROR; 906 return 0; 907 } 908 while (dsize > 0) 909 { 910 OCSP_RESPID *id; 911 int idsize; 912 if (dsize < 4) 913 { 914 *al = SSL_AD_DECODE_ERROR; 915 return 0; 916 } 917 n2s(data, idsize); 918 dsize -= 2 + idsize; 919 if (dsize < 0) 920 { 921 *al = SSL_AD_DECODE_ERROR; 922 return 0; 923 } 924 sdata = data; 925 data += idsize; 926 id = d2i_OCSP_RESPID(NULL, 927 &sdata, idsize); 928 if (!id) 929 { 930 *al = SSL_AD_DECODE_ERROR; 931 return 0; 932 } 933 if (data != sdata) 934 { 935 OCSP_RESPID_free(id); 936 *al = SSL_AD_DECODE_ERROR; 937 return 0; 938 } 939 if (!s->tlsext_ocsp_ids 940 && !(s->tlsext_ocsp_ids = 941 sk_OCSP_RESPID_new_null())) 942 { 943 OCSP_RESPID_free(id); 944 *al = SSL_AD_INTERNAL_ERROR; 945 return 0; 946 } 947 if (!sk_OCSP_RESPID_push( 948 s->tlsext_ocsp_ids, id)) 949 { 950 OCSP_RESPID_free(id); 951 *al = SSL_AD_INTERNAL_ERROR; 952 return 0; 953 } 954 } 955 956 /* Read in request_extensions */ 957 n2s(data,dsize); 958 size -= 2; 959 if (dsize > size) 960 { 961 *al = SSL_AD_DECODE_ERROR; 962 return 0; 963 } 964 sdata = data; 965 if (dsize > 0) 966 { 967 s->tlsext_ocsp_exts = 968 d2i_X509_EXTENSIONS(NULL, 969 &sdata, dsize); 970 if (!s->tlsext_ocsp_exts 971 || (data + dsize != sdata)) 972 { 973 *al = SSL_AD_DECODE_ERROR; 974 return 0; 975 } 976 } 977 } 978 /* We don't know what to do with any other type 979 * so ignore it. 980 */ 981 else 982 s->tlsext_status_type = -1; 983 } 984 985 /* session ticket processed earlier */ 986 data+=size; 987 } 988 989 *p = data; 990 991 ri_check: 992 993 /* Need RI if renegotiating */ 994 995 if (!renegotiate_seen && s->new_session && 996 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 997 { 998 *al = SSL_AD_HANDSHAKE_FAILURE; 999 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT, 1000 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1001 return 0; 1002 } 1003 1004 return 1; 1005 } 1006 1007 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 1008 { 1009 unsigned short type; 1010 unsigned short size; 1011 unsigned short len; 1012 unsigned char *data = *p; 1013 int tlsext_servername = 0; 1014 int renegotiate_seen = 0; 1015 1016 if (data >= (d+n-2)) 1017 goto ri_check; 1018 1019 n2s(data,len); 1020 1021 while(data <= (d+n-4)) 1022 { 1023 n2s(data,type); 1024 n2s(data,size); 1025 1026 if (data+size > (d+n)) 1027 goto ri_check; 1028 1029 if (s->tlsext_debug_cb) 1030 s->tlsext_debug_cb(s, 1, type, data, size, 1031 s->tlsext_debug_arg); 1032 1033 if (type == TLSEXT_TYPE_server_name) 1034 { 1035 if (s->tlsext_hostname == NULL || size > 0) 1036 { 1037 *al = TLS1_AD_UNRECOGNIZED_NAME; 1038 return 0; 1039 } 1040 tlsext_servername = 1; 1041 } 1042 1043 #ifndef OPENSSL_NO_EC 1044 else if (type == TLSEXT_TYPE_ec_point_formats && 1045 s->version != DTLS1_VERSION) 1046 { 1047 unsigned char *sdata = data; 1048 int ecpointformatlist_length = *(sdata++); 1049 1050 if (ecpointformatlist_length != size - 1) 1051 { 1052 *al = TLS1_AD_DECODE_ERROR; 1053 return 0; 1054 } 1055 s->session->tlsext_ecpointformatlist_length = 0; 1056 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist); 1057 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL) 1058 { 1059 *al = TLS1_AD_INTERNAL_ERROR; 1060 return 0; 1061 } 1062 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length; 1063 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length); 1064 #if 0 1065 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist "); 1066 sdata = s->session->tlsext_ecpointformatlist; 1067 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1068 fprintf(stderr,"%i ",*(sdata++)); 1069 fprintf(stderr,"\n"); 1070 #endif 1071 } 1072 #endif /* OPENSSL_NO_EC */ 1073 1074 else if (type == TLSEXT_TYPE_session_ticket) 1075 { 1076 if (s->tls_session_ticket_ext_cb && 1077 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg)) 1078 { 1079 *al = TLS1_AD_INTERNAL_ERROR; 1080 return 0; 1081 } 1082 if ((SSL_get_options(s) & SSL_OP_NO_TICKET) 1083 || (size > 0)) 1084 { 1085 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1086 return 0; 1087 } 1088 s->tlsext_ticket_expected = 1; 1089 } 1090 #ifdef TLSEXT_TYPE_opaque_prf_input 1091 else if (type == TLSEXT_TYPE_opaque_prf_input && 1092 s->version != DTLS1_VERSION) 1093 { 1094 unsigned char *sdata = data; 1095 1096 if (size < 2) 1097 { 1098 *al = SSL_AD_DECODE_ERROR; 1099 return 0; 1100 } 1101 n2s(sdata, s->s3->server_opaque_prf_input_len); 1102 if (s->s3->server_opaque_prf_input_len != size - 2) 1103 { 1104 *al = SSL_AD_DECODE_ERROR; 1105 return 0; 1106 } 1107 1108 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1109 OPENSSL_free(s->s3->server_opaque_prf_input); 1110 if (s->s3->server_opaque_prf_input_len == 0) 1111 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1112 else 1113 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len); 1114 1115 if (s->s3->server_opaque_prf_input == NULL) 1116 { 1117 *al = TLS1_AD_INTERNAL_ERROR; 1118 return 0; 1119 } 1120 } 1121 #endif 1122 else if (type == TLSEXT_TYPE_status_request && 1123 s->version != DTLS1_VERSION) 1124 { 1125 /* MUST be empty and only sent if we've requested 1126 * a status request message. 1127 */ 1128 if ((s->tlsext_status_type == -1) || (size > 0)) 1129 { 1130 *al = TLS1_AD_UNSUPPORTED_EXTENSION; 1131 return 0; 1132 } 1133 /* Set flag to expect CertificateStatus message */ 1134 s->tlsext_status_expected = 1; 1135 } 1136 else if (type == TLSEXT_TYPE_renegotiate) 1137 { 1138 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al)) 1139 return 0; 1140 renegotiate_seen = 1; 1141 } 1142 data+=size; 1143 } 1144 1145 if (data != d+n) 1146 { 1147 *al = SSL_AD_DECODE_ERROR; 1148 return 0; 1149 } 1150 1151 if (!s->hit && tlsext_servername == 1) 1152 { 1153 if (s->tlsext_hostname) 1154 { 1155 if (s->session->tlsext_hostname == NULL) 1156 { 1157 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname); 1158 if (!s->session->tlsext_hostname) 1159 { 1160 *al = SSL_AD_UNRECOGNIZED_NAME; 1161 return 0; 1162 } 1163 } 1164 else 1165 { 1166 *al = SSL_AD_DECODE_ERROR; 1167 return 0; 1168 } 1169 } 1170 } 1171 1172 *p = data; 1173 1174 ri_check: 1175 1176 /* Determine if we need to see RI. Strictly speaking if we want to 1177 * avoid an attack we should *always* see RI even on initial server 1178 * hello because the client doesn't see any renegotiation during an 1179 * attack. However this would mean we could not connect to any server 1180 * which doesn't support RI so for the immediate future tolerate RI 1181 * absence on initial connect only. 1182 */ 1183 if (!renegotiate_seen && 1184 (s->new_session || !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)) 1185 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) 1186 { 1187 *al = SSL_AD_HANDSHAKE_FAILURE; 1188 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT, 1189 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1190 return 0; 1191 } 1192 1193 return 1; 1194 } 1195 1196 1197 int ssl_prepare_clienthello_tlsext(SSL *s) 1198 { 1199 #ifndef OPENSSL_NO_EC 1200 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 1201 * and elliptic curves we support. 1202 */ 1203 int using_ecc = 0; 1204 int i; 1205 unsigned char *j; 1206 unsigned long alg_k, alg_a; 1207 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s); 1208 1209 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) 1210 { 1211 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i); 1212 1213 alg_k = c->algorithm_mkey; 1214 alg_a = c->algorithm_auth; 1215 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA))) 1216 { 1217 using_ecc = 1; 1218 break; 1219 } 1220 } 1221 using_ecc = using_ecc && (s->version == TLS1_VERSION); 1222 if (using_ecc) 1223 { 1224 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1225 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1226 { 1227 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1228 return -1; 1229 } 1230 s->tlsext_ecpointformatlist_length = 3; 1231 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1232 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1233 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1234 1235 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */ 1236 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist); 1237 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2; 1238 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) 1239 { 1240 s->tlsext_ellipticcurvelist_length = 0; 1241 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1242 return -1; 1243 } 1244 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <= 1245 sizeof(nid_list)/sizeof(nid_list[0]); i++) 1246 s2n(i,j); 1247 } 1248 #endif /* OPENSSL_NO_EC */ 1249 1250 #ifdef TLSEXT_TYPE_opaque_prf_input 1251 { 1252 int r = 1; 1253 1254 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1255 { 1256 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1257 if (!r) 1258 return -1; 1259 } 1260 1261 if (s->tlsext_opaque_prf_input != NULL) 1262 { 1263 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */ 1264 OPENSSL_free(s->s3->client_opaque_prf_input); 1265 1266 if (s->tlsext_opaque_prf_input_len == 0) 1267 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1268 else 1269 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1270 if (s->s3->client_opaque_prf_input == NULL) 1271 { 1272 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1273 return -1; 1274 } 1275 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1276 } 1277 1278 if (r == 2) 1279 /* at callback's request, insist on receiving an appropriate server opaque PRF input */ 1280 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1281 } 1282 #endif 1283 1284 return 1; 1285 } 1286 1287 int ssl_prepare_serverhello_tlsext(SSL *s) 1288 { 1289 #ifndef OPENSSL_NO_EC 1290 /* If we are server and using an ECC cipher suite, send the point formats we support 1291 * if the client sent us an ECPointsFormat extension. Note that the server is not 1292 * supposed to send an EllipticCurves extension. 1293 */ 1294 1295 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1296 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1297 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA); 1298 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL); 1299 1300 if (using_ecc) 1301 { 1302 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist); 1303 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) 1304 { 1305 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE); 1306 return -1; 1307 } 1308 s->tlsext_ecpointformatlist_length = 3; 1309 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed; 1310 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime; 1311 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 1312 } 1313 #endif /* OPENSSL_NO_EC */ 1314 1315 return 1; 1316 } 1317 1318 int ssl_check_clienthello_tlsext(SSL *s) 1319 { 1320 int ret=SSL_TLSEXT_ERR_NOACK; 1321 int al = SSL_AD_UNRECOGNIZED_NAME; 1322 1323 #ifndef OPENSSL_NO_EC 1324 /* The handling of the ECPointFormats extension is done elsewhere, namely in 1325 * ssl3_choose_cipher in s3_lib.c. 1326 */ 1327 /* The handling of the EllipticCurves extension is done elsewhere, namely in 1328 * ssl3_choose_cipher in s3_lib.c. 1329 */ 1330 #endif 1331 1332 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1333 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1334 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1335 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1336 1337 /* If status request then ask callback what to do. 1338 * Note: this must be called after servername callbacks in case 1339 * the certificate has changed. 1340 */ 1341 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) 1342 { 1343 int r; 1344 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1345 switch (r) 1346 { 1347 /* We don't want to send a status request response */ 1348 case SSL_TLSEXT_ERR_NOACK: 1349 s->tlsext_status_expected = 0; 1350 break; 1351 /* status request response should be sent */ 1352 case SSL_TLSEXT_ERR_OK: 1353 if (s->tlsext_ocsp_resp) 1354 s->tlsext_status_expected = 1; 1355 else 1356 s->tlsext_status_expected = 0; 1357 break; 1358 /* something bad happened */ 1359 case SSL_TLSEXT_ERR_ALERT_FATAL: 1360 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1361 al = SSL_AD_INTERNAL_ERROR; 1362 goto err; 1363 } 1364 } 1365 else 1366 s->tlsext_status_expected = 0; 1367 1368 #ifdef TLSEXT_TYPE_opaque_prf_input 1369 { 1370 /* This sort of belongs into ssl_prepare_serverhello_tlsext(), 1371 * but we might be sending an alert in response to the client hello, 1372 * so this has to happen here in ssl_check_clienthello_tlsext(). */ 1373 1374 int r = 1; 1375 1376 if (s->ctx->tlsext_opaque_prf_input_callback != 0) 1377 { 1378 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg); 1379 if (!r) 1380 { 1381 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1382 al = SSL_AD_INTERNAL_ERROR; 1383 goto err; 1384 } 1385 } 1386 1387 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */ 1388 OPENSSL_free(s->s3->server_opaque_prf_input); 1389 s->s3->server_opaque_prf_input = NULL; 1390 1391 if (s->tlsext_opaque_prf_input != NULL) 1392 { 1393 if (s->s3->client_opaque_prf_input != NULL && 1394 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len) 1395 { 1396 /* can only use this extension if we have a server opaque PRF input 1397 * of the same length as the client opaque PRF input! */ 1398 1399 if (s->tlsext_opaque_prf_input_len == 0) 1400 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */ 1401 else 1402 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len); 1403 if (s->s3->server_opaque_prf_input == NULL) 1404 { 1405 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1406 al = SSL_AD_INTERNAL_ERROR; 1407 goto err; 1408 } 1409 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len; 1410 } 1411 } 1412 1413 if (r == 2 && s->s3->server_opaque_prf_input == NULL) 1414 { 1415 /* The callback wants to enforce use of the extension, 1416 * but we can't do that with the client opaque PRF input; 1417 * abort the handshake. 1418 */ 1419 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1420 al = SSL_AD_HANDSHAKE_FAILURE; 1421 } 1422 } 1423 1424 #endif 1425 err: 1426 switch (ret) 1427 { 1428 case SSL_TLSEXT_ERR_ALERT_FATAL: 1429 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1430 return -1; 1431 1432 case SSL_TLSEXT_ERR_ALERT_WARNING: 1433 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1434 return 1; 1435 1436 case SSL_TLSEXT_ERR_NOACK: 1437 s->servername_done=0; 1438 default: 1439 return 1; 1440 } 1441 } 1442 1443 int ssl_check_serverhello_tlsext(SSL *s) 1444 { 1445 int ret=SSL_TLSEXT_ERR_NOACK; 1446 int al = SSL_AD_UNRECOGNIZED_NAME; 1447 1448 #ifndef OPENSSL_NO_EC 1449 /* If we are client and using an elliptic curve cryptography cipher suite, then server 1450 * must return a an EC point formats lists containing uncompressed. 1451 */ 1452 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1453 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1454 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 1455 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA))) 1456 { 1457 /* we are using an ECC cipher */ 1458 size_t i; 1459 unsigned char *list; 1460 int found_uncompressed = 0; 1461 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0)) 1462 { 1463 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1464 return -1; 1465 } 1466 list = s->session->tlsext_ecpointformatlist; 1467 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) 1468 { 1469 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) 1470 { 1471 found_uncompressed = 1; 1472 break; 1473 } 1474 } 1475 if (!found_uncompressed) 1476 { 1477 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST); 1478 return -1; 1479 } 1480 } 1481 ret = SSL_TLSEXT_ERR_OK; 1482 #endif /* OPENSSL_NO_EC */ 1483 1484 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 1485 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg); 1486 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 1487 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg); 1488 1489 #ifdef TLSEXT_TYPE_opaque_prf_input 1490 if (s->s3->server_opaque_prf_input_len > 0) 1491 { 1492 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs. 1493 * So first verify that we really have a value from the server too. */ 1494 1495 if (s->s3->server_opaque_prf_input == NULL) 1496 { 1497 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1498 al = SSL_AD_HANDSHAKE_FAILURE; 1499 } 1500 1501 /* Anytime the server *has* sent an opaque PRF input, we need to check 1502 * that we have a client opaque PRF input of the same size. */ 1503 if (s->s3->client_opaque_prf_input == NULL || 1504 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len) 1505 { 1506 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1507 al = SSL_AD_ILLEGAL_PARAMETER; 1508 } 1509 } 1510 #endif 1511 1512 /* If we've requested certificate status and we wont get one 1513 * tell the callback 1514 */ 1515 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected) 1516 && s->ctx && s->ctx->tlsext_status_cb) 1517 { 1518 int r; 1519 /* Set resp to NULL, resplen to -1 so callback knows 1520 * there is no response. 1521 */ 1522 if (s->tlsext_ocsp_resp) 1523 { 1524 OPENSSL_free(s->tlsext_ocsp_resp); 1525 s->tlsext_ocsp_resp = NULL; 1526 } 1527 s->tlsext_ocsp_resplen = -1; 1528 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 1529 if (r == 0) 1530 { 1531 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1532 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1533 } 1534 if (r < 0) 1535 { 1536 al = SSL_AD_INTERNAL_ERROR; 1537 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 1538 } 1539 } 1540 1541 switch (ret) 1542 { 1543 case SSL_TLSEXT_ERR_ALERT_FATAL: 1544 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1545 return -1; 1546 1547 case SSL_TLSEXT_ERR_ALERT_WARNING: 1548 ssl3_send_alert(s,SSL3_AL_WARNING,al); 1549 return 1; 1550 1551 case SSL_TLSEXT_ERR_NOACK: 1552 s->servername_done=0; 1553 default: 1554 return 1; 1555 } 1556 } 1557 1558 /* Since the server cache lookup is done early on in the processing of client 1559 * hello and other operations depend on the result we need to handle any TLS 1560 * session ticket extension at the same time. 1561 */ 1562 1563 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len, 1564 const unsigned char *limit, SSL_SESSION **ret) 1565 { 1566 /* Point after session ID in client hello */ 1567 const unsigned char *p = session_id + len; 1568 unsigned short i; 1569 1570 /* If tickets disabled behave as if no ticket present 1571 * to permit stateful resumption. 1572 */ 1573 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1574 return 1; 1575 1576 if ((s->version <= SSL3_VERSION) || !limit) 1577 return 1; 1578 if (p >= limit) 1579 return -1; 1580 /* Skip past DTLS cookie */ 1581 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1582 { 1583 i = *(p++); 1584 p+= i; 1585 if (p >= limit) 1586 return -1; 1587 } 1588 /* Skip past cipher list */ 1589 n2s(p, i); 1590 p+= i; 1591 if (p >= limit) 1592 return -1; 1593 /* Skip past compression algorithm list */ 1594 i = *(p++); 1595 p += i; 1596 if (p > limit) 1597 return -1; 1598 /* Now at start of extensions */ 1599 if ((p + 2) >= limit) 1600 return 1; 1601 n2s(p, i); 1602 while ((p + 4) <= limit) 1603 { 1604 unsigned short type, size; 1605 n2s(p, type); 1606 n2s(p, size); 1607 if (p + size > limit) 1608 return 1; 1609 if (type == TLSEXT_TYPE_session_ticket) 1610 { 1611 /* If tickets disabled indicate cache miss which will 1612 * trigger a full handshake 1613 */ 1614 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 1615 return 1; 1616 /* If zero length note client will accept a ticket 1617 * and indicate cache miss to trigger full handshake 1618 */ 1619 if (size == 0) 1620 { 1621 s->tlsext_ticket_expected = 1; 1622 return 0; /* Cache miss */ 1623 } 1624 if (s->tls_session_secret_cb) 1625 { 1626 /* Indicate cache miss here and instead of 1627 * generating the session from ticket now, 1628 * trigger abbreviated handshake based on 1629 * external mechanism to calculate the master 1630 * secret later. */ 1631 return 0; 1632 } 1633 return tls_decrypt_ticket(s, p, size, session_id, len, 1634 ret); 1635 } 1636 p += size; 1637 } 1638 return 1; 1639 } 1640 1641 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1642 const unsigned char *sess_id, int sesslen, 1643 SSL_SESSION **psess) 1644 { 1645 SSL_SESSION *sess; 1646 unsigned char *sdec; 1647 const unsigned char *p; 1648 int slen, mlen, renew_ticket = 0; 1649 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1650 HMAC_CTX hctx; 1651 EVP_CIPHER_CTX ctx; 1652 SSL_CTX *tctx = s->initial_ctx; 1653 /* Need at least keyname + iv + some encrypted data */ 1654 if (eticklen < 48) 1655 goto tickerr; 1656 /* Initialize session ticket encryption and HMAC contexts */ 1657 HMAC_CTX_init(&hctx); 1658 EVP_CIPHER_CTX_init(&ctx); 1659 if (tctx->tlsext_ticket_key_cb) 1660 { 1661 unsigned char *nctick = (unsigned char *)etick; 1662 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16, 1663 &ctx, &hctx, 0); 1664 if (rv < 0) 1665 return -1; 1666 if (rv == 0) 1667 goto tickerr; 1668 if (rv == 2) 1669 renew_ticket = 1; 1670 } 1671 else 1672 { 1673 /* Check key name matches */ 1674 if (memcmp(etick, tctx->tlsext_tick_key_name, 16)) 1675 goto tickerr; 1676 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1677 tlsext_tick_md(), NULL); 1678 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1679 tctx->tlsext_tick_aes_key, etick + 16); 1680 } 1681 /* Attempt to process session ticket, first conduct sanity and 1682 * integrity checks on ticket. 1683 */ 1684 mlen = HMAC_size(&hctx); 1685 if (mlen < 0) 1686 { 1687 EVP_CIPHER_CTX_cleanup(&ctx); 1688 return -1; 1689 } 1690 eticklen -= mlen; 1691 /* Check HMAC of encrypted ticket */ 1692 HMAC_Update(&hctx, etick, eticklen); 1693 HMAC_Final(&hctx, tick_hmac, NULL); 1694 HMAC_CTX_cleanup(&hctx); 1695 if (memcmp(tick_hmac, etick + eticklen, mlen)) 1696 goto tickerr; 1697 /* Attempt to decrypt session data */ 1698 /* Move p after IV to start of encrypted ticket, update length */ 1699 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1700 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1701 sdec = OPENSSL_malloc(eticklen); 1702 if (!sdec) 1703 { 1704 EVP_CIPHER_CTX_cleanup(&ctx); 1705 return -1; 1706 } 1707 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen); 1708 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) 1709 goto tickerr; 1710 slen += mlen; 1711 EVP_CIPHER_CTX_cleanup(&ctx); 1712 p = sdec; 1713 1714 sess = d2i_SSL_SESSION(NULL, &p, slen); 1715 OPENSSL_free(sdec); 1716 if (sess) 1717 { 1718 /* The session ID if non-empty is used by some clients to 1719 * detect that the ticket has been accepted. So we copy it to 1720 * the session structure. If it is empty set length to zero 1721 * as required by standard. 1722 */ 1723 if (sesslen) 1724 memcpy(sess->session_id, sess_id, sesslen); 1725 sess->session_id_length = sesslen; 1726 *psess = sess; 1727 s->tlsext_ticket_expected = renew_ticket; 1728 return 1; 1729 } 1730 /* If session decrypt failure indicate a cache miss and set state to 1731 * send a new ticket 1732 */ 1733 tickerr: 1734 s->tlsext_ticket_expected = 1; 1735 return 0; 1736 } 1737 1738 #endif 1739
Indexes created Sat Feb 28 05:31:39 UTC 2026