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