1 /* $OpenBSD: t1_lib.c,v 1.140 2018/01/27 15:30:05 jsing Exp $ */ 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> 113 114 #include <openssl/evp.h> 115 #include <openssl/hmac.h> 116 #include <openssl/objects.h> 117 #include <openssl/ocsp.h> 118 119 #include "ssl_locl.h" 120 121 #include "bytestring.h" 122 #include "ssl_tlsext.h" 123 124 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen, 125 const unsigned char *sess_id, int sesslen, 126 SSL_SESSION **psess); 127 128 SSL3_ENC_METHOD TLSv1_enc_data = { 129 .enc = tls1_enc, 130 .enc_flags = 0, 131 }; 132 133 SSL3_ENC_METHOD TLSv1_1_enc_data = { 134 .enc = tls1_enc, 135 .enc_flags = SSL_ENC_FLAG_EXPLICIT_IV, 136 }; 137 138 SSL3_ENC_METHOD TLSv1_2_enc_data = { 139 .enc = tls1_enc, 140 .enc_flags = SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS| 141 SSL_ENC_FLAG_SHA256_PRF|SSL_ENC_FLAG_TLS1_2_CIPHERS, 142 }; 143 144 long 145 tls1_default_timeout(void) 146 { 147 /* 2 hours, the 24 hours mentioned in the TLSv1 spec 148 * is way too long for http, the cache would over fill */ 149 return (60 * 60 * 2); 150 } 151 152 int 153 tls1_new(SSL *s) 154 { 155 if (!ssl3_new(s)) 156 return (0); 157 s->method->internal->ssl_clear(s); 158 return (1); 159 } 160 161 void 162 tls1_free(SSL *s) 163 { 164 if (s == NULL) 165 return; 166 167 free(s->internal->tlsext_session_ticket); 168 ssl3_free(s); 169 } 170 171 void 172 tls1_clear(SSL *s) 173 { 174 ssl3_clear(s); 175 s->version = s->method->internal->version; 176 } 177 178 static int nid_list[] = { 179 NID_sect163k1, /* sect163k1 (1) */ 180 NID_sect163r1, /* sect163r1 (2) */ 181 NID_sect163r2, /* sect163r2 (3) */ 182 NID_sect193r1, /* sect193r1 (4) */ 183 NID_sect193r2, /* sect193r2 (5) */ 184 NID_sect233k1, /* sect233k1 (6) */ 185 NID_sect233r1, /* sect233r1 (7) */ 186 NID_sect239k1, /* sect239k1 (8) */ 187 NID_sect283k1, /* sect283k1 (9) */ 188 NID_sect283r1, /* sect283r1 (10) */ 189 NID_sect409k1, /* sect409k1 (11) */ 190 NID_sect409r1, /* sect409r1 (12) */ 191 NID_sect571k1, /* sect571k1 (13) */ 192 NID_sect571r1, /* sect571r1 (14) */ 193 NID_secp160k1, /* secp160k1 (15) */ 194 NID_secp160r1, /* secp160r1 (16) */ 195 NID_secp160r2, /* secp160r2 (17) */ 196 NID_secp192k1, /* secp192k1 (18) */ 197 NID_X9_62_prime192v1, /* secp192r1 (19) */ 198 NID_secp224k1, /* secp224k1 (20) */ 199 NID_secp224r1, /* secp224r1 (21) */ 200 NID_secp256k1, /* secp256k1 (22) */ 201 NID_X9_62_prime256v1, /* secp256r1 (23) */ 202 NID_secp384r1, /* secp384r1 (24) */ 203 NID_secp521r1, /* secp521r1 (25) */ 204 NID_brainpoolP256r1, /* brainpoolP256r1 (26) */ 205 NID_brainpoolP384r1, /* brainpoolP384r1 (27) */ 206 NID_brainpoolP512r1, /* brainpoolP512r1 (28) */ 207 NID_X25519, /* X25519 (29) */ 208 }; 209 210 #if 0 211 static const uint8_t ecformats_list[] = { 212 TLSEXT_ECPOINTFORMAT_uncompressed, 213 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime, 214 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 215 }; 216 #endif 217 218 static const uint8_t ecformats_default[] = { 219 TLSEXT_ECPOINTFORMAT_uncompressed, 220 }; 221 222 #if 0 223 static const uint16_t eccurves_list[] = { 224 29, /* X25519 (29) */ 225 14, /* sect571r1 (14) */ 226 13, /* sect571k1 (13) */ 227 25, /* secp521r1 (25) */ 228 28, /* brainpoolP512r1 (28) */ 229 11, /* sect409k1 (11) */ 230 12, /* sect409r1 (12) */ 231 27, /* brainpoolP384r1 (27) */ 232 24, /* secp384r1 (24) */ 233 9, /* sect283k1 (9) */ 234 10, /* sect283r1 (10) */ 235 26, /* brainpoolP256r1 (26) */ 236 22, /* secp256k1 (22) */ 237 23, /* secp256r1 (23) */ 238 8, /* sect239k1 (8) */ 239 6, /* sect233k1 (6) */ 240 7, /* sect233r1 (7) */ 241 20, /* secp224k1 (20) */ 242 21, /* secp224r1 (21) */ 243 4, /* sect193r1 (4) */ 244 5, /* sect193r2 (5) */ 245 18, /* secp192k1 (18) */ 246 19, /* secp192r1 (19) */ 247 1, /* sect163k1 (1) */ 248 2, /* sect163r1 (2) */ 249 3, /* sect163r2 (3) */ 250 15, /* secp160k1 (15) */ 251 16, /* secp160r1 (16) */ 252 17, /* secp160r2 (17) */ 253 }; 254 #endif 255 256 static const uint16_t eccurves_default[] = { 257 29, /* X25519 (29) */ 258 23, /* secp256r1 (23) */ 259 24, /* secp384r1 (24) */ 260 }; 261 262 int 263 tls1_ec_curve_id2nid(const uint16_t curve_id) 264 { 265 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 266 if ((curve_id < 1) || 267 ((unsigned int)curve_id > sizeof(nid_list) / sizeof(nid_list[0]))) 268 return 0; 269 return nid_list[curve_id - 1]; 270 } 271 272 uint16_t 273 tls1_ec_nid2curve_id(const int nid) 274 { 275 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */ 276 switch (nid) { 277 case NID_sect163k1: /* sect163k1 (1) */ 278 return 1; 279 case NID_sect163r1: /* sect163r1 (2) */ 280 return 2; 281 case NID_sect163r2: /* sect163r2 (3) */ 282 return 3; 283 case NID_sect193r1: /* sect193r1 (4) */ 284 return 4; 285 case NID_sect193r2: /* sect193r2 (5) */ 286 return 5; 287 case NID_sect233k1: /* sect233k1 (6) */ 288 return 6; 289 case NID_sect233r1: /* sect233r1 (7) */ 290 return 7; 291 case NID_sect239k1: /* sect239k1 (8) */ 292 return 8; 293 case NID_sect283k1: /* sect283k1 (9) */ 294 return 9; 295 case NID_sect283r1: /* sect283r1 (10) */ 296 return 10; 297 case NID_sect409k1: /* sect409k1 (11) */ 298 return 11; 299 case NID_sect409r1: /* sect409r1 (12) */ 300 return 12; 301 case NID_sect571k1: /* sect571k1 (13) */ 302 return 13; 303 case NID_sect571r1: /* sect571r1 (14) */ 304 return 14; 305 case NID_secp160k1: /* secp160k1 (15) */ 306 return 15; 307 case NID_secp160r1: /* secp160r1 (16) */ 308 return 16; 309 case NID_secp160r2: /* secp160r2 (17) */ 310 return 17; 311 case NID_secp192k1: /* secp192k1 (18) */ 312 return 18; 313 case NID_X9_62_prime192v1: /* secp192r1 (19) */ 314 return 19; 315 case NID_secp224k1: /* secp224k1 (20) */ 316 return 20; 317 case NID_secp224r1: /* secp224r1 (21) */ 318 return 21; 319 case NID_secp256k1: /* secp256k1 (22) */ 320 return 22; 321 case NID_X9_62_prime256v1: /* secp256r1 (23) */ 322 return 23; 323 case NID_secp384r1: /* secp384r1 (24) */ 324 return 24; 325 case NID_secp521r1: /* secp521r1 (25) */ 326 return 25; 327 case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */ 328 return 26; 329 case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */ 330 return 27; 331 case NID_brainpoolP512r1: /* brainpoolP512r1 (28) */ 332 return 28; 333 case NID_X25519: /* X25519 (29) */ 334 return 29; 335 default: 336 return 0; 337 } 338 } 339 340 /* 341 * Return the appropriate format list. If client_formats is non-zero, return 342 * the client/session formats. Otherwise return the custom format list if one 343 * exists, or the default formats if a custom list has not been specified. 344 */ 345 void 346 tls1_get_formatlist(SSL *s, int client_formats, const uint8_t **pformats, 347 size_t *pformatslen) 348 { 349 if (client_formats != 0) { 350 *pformats = SSI(s)->tlsext_ecpointformatlist; 351 *pformatslen = SSI(s)->tlsext_ecpointformatlist_length; 352 return; 353 } 354 355 *pformats = s->internal->tlsext_ecpointformatlist; 356 *pformatslen = s->internal->tlsext_ecpointformatlist_length; 357 if (*pformats == NULL) { 358 *pformats = ecformats_default; 359 *pformatslen = sizeof(ecformats_default); 360 } 361 } 362 363 /* 364 * Return the appropriate curve list. If client_curves is non-zero, return 365 * the client/session curves. Otherwise return the custom curve list if one 366 * exists, or the default curves if a custom list has not been specified. 367 */ 368 void 369 tls1_get_curvelist(SSL *s, int client_curves, const uint16_t **pcurves, 370 size_t *pcurveslen) 371 { 372 if (client_curves != 0) { 373 *pcurves = SSI(s)->tlsext_supportedgroups; 374 *pcurveslen = SSI(s)->tlsext_supportedgroups_length; 375 return; 376 } 377 378 *pcurves = s->internal->tlsext_supportedgroups; 379 *pcurveslen = s->internal->tlsext_supportedgroups_length; 380 if (*pcurves == NULL) { 381 *pcurves = eccurves_default; 382 *pcurveslen = sizeof(eccurves_default) / 2; 383 } 384 } 385 386 int 387 tls1_set_groups(uint16_t **out_group_ids, size_t *out_group_ids_len, 388 const int *groups, size_t ngroups) 389 { 390 uint16_t *group_ids; 391 size_t i; 392 393 group_ids = calloc(ngroups, sizeof(uint16_t)); 394 if (group_ids == NULL) 395 return 0; 396 397 for (i = 0; i < ngroups; i++) { 398 group_ids[i] = tls1_ec_nid2curve_id(groups[i]); 399 if (group_ids[i] == 0) { 400 free(group_ids); 401 return 0; 402 } 403 } 404 405 free(*out_group_ids); 406 *out_group_ids = group_ids; 407 *out_group_ids_len = ngroups; 408 409 return 1; 410 } 411 412 int 413 tls1_set_groups_list(uint16_t **out_group_ids, size_t *out_group_ids_len, 414 const char *groups) 415 { 416 uint16_t *new_group_ids, *group_ids = NULL; 417 size_t ngroups = 0; 418 char *gs, *p, *q; 419 int nid; 420 421 if ((gs = strdup(groups)) == NULL) 422 return 0; 423 424 q = gs; 425 while ((p = strsep(&q, ":")) != NULL) { 426 nid = OBJ_sn2nid(p); 427 if (nid == NID_undef) 428 nid = OBJ_ln2nid(p); 429 if (nid == NID_undef) 430 nid = EC_curve_nist2nid(p); 431 if (nid == NID_undef) 432 goto err; 433 434 if ((new_group_ids = reallocarray(group_ids, ngroups + 1, 435 sizeof(uint16_t))) == NULL) 436 goto err; 437 group_ids = new_group_ids; 438 439 group_ids[ngroups] = tls1_ec_nid2curve_id(nid); 440 if (group_ids[ngroups] == 0) 441 goto err; 442 443 ngroups++; 444 } 445 446 free(gs); 447 free(*out_group_ids); 448 *out_group_ids = group_ids; 449 *out_group_ids_len = ngroups; 450 451 return 1; 452 453 err: 454 free(gs); 455 free(group_ids); 456 457 return 0; 458 } 459 460 /* Check that a curve is one of our preferences. */ 461 int 462 tls1_check_curve(SSL *s, const uint16_t curve_id) 463 { 464 const uint16_t *curves; 465 size_t curveslen, i; 466 467 tls1_get_curvelist(s, 0, &curves, &curveslen); 468 469 for (i = 0; i < curveslen; i++) { 470 if (curves[i] == curve_id) 471 return (1); 472 } 473 return (0); 474 } 475 476 int 477 tls1_get_shared_curve(SSL *s) 478 { 479 size_t preflen, supplen, i, j; 480 const uint16_t *pref, *supp; 481 unsigned long server_pref; 482 483 /* Cannot do anything on the client side. */ 484 if (s->server == 0) 485 return (NID_undef); 486 487 /* Return first preference shared curve. */ 488 server_pref = (s->internal->options & SSL_OP_CIPHER_SERVER_PREFERENCE); 489 tls1_get_curvelist(s, (server_pref == 0), &pref, &preflen); 490 tls1_get_curvelist(s, (server_pref != 0), &supp, &supplen); 491 492 for (i = 0; i < preflen; i++) { 493 for (j = 0; j < supplen; j++) { 494 if (pref[i] == supp[j]) 495 return (tls1_ec_curve_id2nid(pref[i])); 496 } 497 } 498 return (NID_undef); 499 } 500 501 /* For an EC key set TLS ID and required compression based on parameters. */ 502 static int 503 tls1_set_ec_id(uint16_t *curve_id, uint8_t *comp_id, EC_KEY *ec) 504 { 505 const EC_GROUP *grp; 506 const EC_METHOD *meth; 507 int is_prime = 0; 508 int nid, id; 509 510 if (ec == NULL) 511 return (0); 512 513 /* Determine if it is a prime field. */ 514 if ((grp = EC_KEY_get0_group(ec)) == NULL) 515 return (0); 516 if ((meth = EC_GROUP_method_of(grp)) == NULL) 517 return (0); 518 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field) 519 is_prime = 1; 520 521 /* Determine curve ID. */ 522 nid = EC_GROUP_get_curve_name(grp); 523 id = tls1_ec_nid2curve_id(nid); 524 525 /* If we have an ID set it, otherwise set arbitrary explicit curve. */ 526 if (id != 0) 527 *curve_id = id; 528 else 529 *curve_id = is_prime ? 0xff01 : 0xff02; 530 531 /* Specify the compression identifier. */ 532 if (comp_id != NULL) { 533 if (EC_KEY_get0_public_key(ec) == NULL) 534 return (0); 535 536 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED) { 537 *comp_id = is_prime ? 538 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime : 539 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2; 540 } else { 541 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed; 542 } 543 } 544 return (1); 545 } 546 547 /* Check that an EC key is compatible with extensions. */ 548 static int 549 tls1_check_ec_key(SSL *s, const uint16_t *curve_id, const uint8_t *comp_id) 550 { 551 size_t curveslen, formatslen, i; 552 const uint16_t *curves; 553 const uint8_t *formats; 554 555 /* 556 * Check point formats extension if present, otherwise everything 557 * is supported (see RFC4492). 558 */ 559 tls1_get_formatlist(s, 1, &formats, &formatslen); 560 if (comp_id != NULL && formats != NULL) { 561 for (i = 0; i < formatslen; i++) { 562 if (formats[i] == *comp_id) 563 break; 564 } 565 if (i == formatslen) 566 return (0); 567 } 568 569 /* 570 * Check curve list if present, otherwise everything is supported. 571 */ 572 tls1_get_curvelist(s, 1, &curves, &curveslen); 573 if (curve_id != NULL && curves != NULL) { 574 for (i = 0; i < curveslen; i++) { 575 if (curves[i] == *curve_id) 576 break; 577 } 578 if (i == curveslen) 579 return (0); 580 } 581 582 return (1); 583 } 584 585 /* Check EC server key is compatible with client extensions. */ 586 int 587 tls1_check_ec_server_key(SSL *s) 588 { 589 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC; 590 uint16_t curve_id; 591 uint8_t comp_id; 592 EVP_PKEY *pkey; 593 int rv; 594 595 if (cpk->x509 == NULL || cpk->privatekey == NULL) 596 return (0); 597 if ((pkey = X509_get_pubkey(cpk->x509)) == NULL) 598 return (0); 599 rv = tls1_set_ec_id(&curve_id, &comp_id, pkey->pkey.ec); 600 EVP_PKEY_free(pkey); 601 if (rv != 1) 602 return (0); 603 604 return tls1_check_ec_key(s, &curve_id, &comp_id); 605 } 606 607 /* Check EC temporary key is compatible with client extensions. */ 608 int 609 tls1_check_ec_tmp_key(SSL *s) 610 { 611 EC_KEY *ec = s->cert->ecdh_tmp; 612 uint16_t curve_id; 613 614 /* Need a shared curve. */ 615 if (tls1_get_shared_curve(s) != NID_undef) 616 return (1); 617 618 if (ec == NULL) 619 return (0); 620 621 if (tls1_set_ec_id(&curve_id, NULL, ec) != 1) 622 return (0); 623 624 return tls1_check_ec_key(s, &curve_id, NULL); 625 } 626 627 /* 628 * List of supported signature algorithms and hashes. Should make this 629 * customisable at some point, for now include everything we support. 630 */ 631 632 static unsigned char tls12_sigalgs[] = { 633 TLSEXT_hash_sha512, TLSEXT_signature_rsa, 634 TLSEXT_hash_sha512, TLSEXT_signature_ecdsa, 635 #ifndef OPENSSL_NO_GOST 636 TLSEXT_hash_streebog_512, TLSEXT_signature_gostr12_512, 637 #endif 638 639 TLSEXT_hash_sha384, TLSEXT_signature_rsa, 640 TLSEXT_hash_sha384, TLSEXT_signature_ecdsa, 641 642 TLSEXT_hash_sha256, TLSEXT_signature_rsa, 643 TLSEXT_hash_sha256, TLSEXT_signature_ecdsa, 644 645 #ifndef OPENSSL_NO_GOST 646 TLSEXT_hash_streebog_256, TLSEXT_signature_gostr12_256, 647 TLSEXT_hash_gost94, TLSEXT_signature_gostr01, 648 #endif 649 650 TLSEXT_hash_sha224, TLSEXT_signature_rsa, 651 TLSEXT_hash_sha224, TLSEXT_signature_ecdsa, 652 653 TLSEXT_hash_sha1, TLSEXT_signature_rsa, 654 TLSEXT_hash_sha1, TLSEXT_signature_ecdsa, 655 }; 656 657 void 658 tls12_get_req_sig_algs(SSL *s, unsigned char **sigalgs, size_t *sigalgs_len) 659 { 660 *sigalgs = tls12_sigalgs; 661 *sigalgs_len = sizeof(tls12_sigalgs); 662 } 663 664 int 665 ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, size_t n, int *al) 666 { 667 unsigned short type; 668 unsigned short size; 669 unsigned short len; 670 unsigned char *data = *p; 671 unsigned char *end = *p + n; 672 CBS cbs; 673 674 S3I(s)->renegotiate_seen = 0; 675 free(S3I(s)->alpn_selected); 676 S3I(s)->alpn_selected = NULL; 677 678 if (data == end) 679 goto ri_check; 680 681 if (end - data < 2) 682 goto err; 683 n2s(data, len); 684 685 if (end - data != len) 686 goto err; 687 688 while (end - data >= 4) { 689 n2s(data, type); 690 n2s(data, size); 691 692 if (end - data < size) 693 goto err; 694 695 if (s->internal->tlsext_debug_cb) 696 s->internal->tlsext_debug_cb(s, 1, type, data, size, 697 s->internal->tlsext_debug_arg); 698 699 CBS_init(&cbs, data, size); 700 if (!tlsext_serverhello_parse_one(s, &cbs, type, al)) 701 return 0; 702 703 data += size; 704 705 } 706 707 if (data != end) { 708 *al = SSL_AD_DECODE_ERROR; 709 return 0; 710 } 711 712 *p = data; 713 714 ri_check: 715 716 /* Determine if we need to see RI. Strictly speaking if we want to 717 * avoid an attack we should *always* see RI even on initial server 718 * hello because the client doesn't see any renegotiation during an 719 * attack. However this would mean we could not connect to any server 720 * which doesn't support RI so for the immediate future tolerate RI 721 * absence on initial connect only. 722 */ 723 if (!S3I(s)->renegotiate_seen && 724 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 725 *al = SSL_AD_HANDSHAKE_FAILURE; 726 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 727 return 0; 728 } 729 730 return 1; 731 732 err: 733 *al = SSL_AD_DECODE_ERROR; 734 return 0; 735 } 736 737 int 738 ssl_check_clienthello_tlsext_early(SSL *s) 739 { 740 int ret = SSL_TLSEXT_ERR_NOACK; 741 int al = SSL_AD_UNRECOGNIZED_NAME; 742 743 /* The handling of the ECPointFormats extension is done elsewhere, namely in 744 * ssl3_choose_cipher in s3_lib.c. 745 */ 746 /* The handling of the EllipticCurves extension is done elsewhere, namely in 747 * ssl3_choose_cipher in s3_lib.c. 748 */ 749 750 if (s->ctx != NULL && s->ctx->internal->tlsext_servername_callback != 0) 751 ret = s->ctx->internal->tlsext_servername_callback(s, &al, 752 s->ctx->internal->tlsext_servername_arg); 753 else if (s->initial_ctx != NULL && s->initial_ctx->internal->tlsext_servername_callback != 0) 754 ret = s->initial_ctx->internal->tlsext_servername_callback(s, &al, 755 s->initial_ctx->internal->tlsext_servername_arg); 756 757 switch (ret) { 758 case SSL_TLSEXT_ERR_ALERT_FATAL: 759 ssl3_send_alert(s, SSL3_AL_FATAL, al); 760 return -1; 761 case SSL_TLSEXT_ERR_ALERT_WARNING: 762 ssl3_send_alert(s, SSL3_AL_WARNING, al); 763 return 1; 764 case SSL_TLSEXT_ERR_NOACK: 765 s->internal->servername_done = 0; 766 default: 767 return 1; 768 } 769 } 770 771 int 772 ssl_check_clienthello_tlsext_late(SSL *s) 773 { 774 int ret = SSL_TLSEXT_ERR_OK; 775 int al = 0; /* XXX gcc3 */ 776 777 /* If status request then ask callback what to do. 778 * Note: this must be called after servername callbacks in case 779 * the certificate has changed, and must be called after the cipher 780 * has been chosen because this may influence which certificate is sent 781 */ 782 if ((s->tlsext_status_type != -1) && 783 s->ctx && s->ctx->internal->tlsext_status_cb) { 784 int r; 785 CERT_PKEY *certpkey; 786 certpkey = ssl_get_server_send_pkey(s); 787 /* If no certificate can't return certificate status */ 788 if (certpkey == NULL) { 789 s->internal->tlsext_status_expected = 0; 790 return 1; 791 } 792 /* Set current certificate to one we will use so 793 * SSL_get_certificate et al can pick it up. 794 */ 795 s->cert->key = certpkey; 796 r = s->ctx->internal->tlsext_status_cb(s, 797 s->ctx->internal->tlsext_status_arg); 798 switch (r) { 799 /* We don't want to send a status request response */ 800 case SSL_TLSEXT_ERR_NOACK: 801 s->internal->tlsext_status_expected = 0; 802 break; 803 /* status request response should be sent */ 804 case SSL_TLSEXT_ERR_OK: 805 if (s->internal->tlsext_ocsp_resp) 806 s->internal->tlsext_status_expected = 1; 807 else 808 s->internal->tlsext_status_expected = 0; 809 break; 810 /* something bad happened */ 811 case SSL_TLSEXT_ERR_ALERT_FATAL: 812 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 813 al = SSL_AD_INTERNAL_ERROR; 814 goto err; 815 } 816 } else 817 s->internal->tlsext_status_expected = 0; 818 819 err: 820 switch (ret) { 821 case SSL_TLSEXT_ERR_ALERT_FATAL: 822 ssl3_send_alert(s, SSL3_AL_FATAL, al); 823 return -1; 824 case SSL_TLSEXT_ERR_ALERT_WARNING: 825 ssl3_send_alert(s, SSL3_AL_WARNING, al); 826 return 1; 827 default: 828 return 1; 829 } 830 } 831 832 int 833 ssl_check_serverhello_tlsext(SSL *s) 834 { 835 int ret = SSL_TLSEXT_ERR_NOACK; 836 int al = SSL_AD_UNRECOGNIZED_NAME; 837 838 ret = SSL_TLSEXT_ERR_OK; 839 840 if (s->ctx != NULL && s->ctx->internal->tlsext_servername_callback != 0) 841 ret = s->ctx->internal->tlsext_servername_callback(s, &al, 842 s->ctx->internal->tlsext_servername_arg); 843 else if (s->initial_ctx != NULL && s->initial_ctx->internal->tlsext_servername_callback != 0) 844 ret = s->initial_ctx->internal->tlsext_servername_callback(s, &al, 845 s->initial_ctx->internal->tlsext_servername_arg); 846 847 /* If we've requested certificate status and we wont get one 848 * tell the callback 849 */ 850 if ((s->tlsext_status_type != -1) && !(s->internal->tlsext_status_expected) && 851 s->ctx && s->ctx->internal->tlsext_status_cb) { 852 int r; 853 /* Set resp to NULL, resplen to -1 so callback knows 854 * there is no response. 855 */ 856 free(s->internal->tlsext_ocsp_resp); 857 s->internal->tlsext_ocsp_resp = NULL; 858 s->internal->tlsext_ocsp_resplen = -1; 859 r = s->ctx->internal->tlsext_status_cb(s, 860 s->ctx->internal->tlsext_status_arg); 861 if (r == 0) { 862 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 863 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 864 } 865 if (r < 0) { 866 al = SSL_AD_INTERNAL_ERROR; 867 ret = SSL_TLSEXT_ERR_ALERT_FATAL; 868 } 869 } 870 871 switch (ret) { 872 case SSL_TLSEXT_ERR_ALERT_FATAL: 873 ssl3_send_alert(s, SSL3_AL_FATAL, al); 874 875 return -1; 876 case SSL_TLSEXT_ERR_ALERT_WARNING: 877 ssl3_send_alert(s, SSL3_AL_WARNING, al); 878 879 return 1; 880 case SSL_TLSEXT_ERR_NOACK: 881 s->internal->servername_done = 0; 882 default: 883 return 1; 884 } 885 } 886 887 /* Since the server cache lookup is done early on in the processing of the 888 * ClientHello, and other operations depend on the result, we need to handle 889 * any TLS session ticket extension at the same time. 890 * 891 * session_id: points at the session ID in the ClientHello. This code will 892 * read past the end of this in order to parse out the session ticket 893 * extension, if any. 894 * len: the length of the session ID. 895 * limit: a pointer to the first byte after the ClientHello. 896 * ret: (output) on return, if a ticket was decrypted, then this is set to 897 * point to the resulting session. 898 * 899 * If s->internal->tls_session_secret_cb is set then we are expecting a pre-shared key 900 * ciphersuite, in which case we have no use for session tickets and one will 901 * never be decrypted, nor will s->internal->tlsext_ticket_expected be set to 1. 902 * 903 * Returns: 904 * -1: fatal error, either from parsing or decrypting the ticket. 905 * 0: no ticket was found (or was ignored, based on settings). 906 * 1: a zero length extension was found, indicating that the client supports 907 * session tickets but doesn't currently have one to offer. 908 * 2: either s->internal->tls_session_secret_cb was set, or a ticket was offered but 909 * couldn't be decrypted because of a non-fatal error. 910 * 3: a ticket was successfully decrypted and *ret was set. 911 * 912 * Side effects: 913 * Sets s->internal->tlsext_ticket_expected to 1 if the server will have to issue 914 * a new session ticket to the client because the client indicated support 915 * (and s->internal->tls_session_secret_cb is NULL) but the client either doesn't have 916 * a session ticket or we couldn't use the one it gave us, or if 917 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket. 918 * Otherwise, s->internal->tlsext_ticket_expected is set to 0. 919 */ 920 int 921 tls1_process_ticket(SSL *s, const unsigned char *session, int session_len, 922 const unsigned char *limit, SSL_SESSION **ret) 923 { 924 /* Point after session ID in client hello */ 925 CBS session_id, cookie, cipher_list, compress_algo, extensions; 926 927 *ret = NULL; 928 s->internal->tlsext_ticket_expected = 0; 929 930 /* If tickets disabled behave as if no ticket present 931 * to permit stateful resumption. 932 */ 933 if (SSL_get_options(s) & SSL_OP_NO_TICKET) 934 return 0; 935 if (!limit) 936 return 0; 937 938 if (limit < session) 939 return -1; 940 941 CBS_init(&session_id, session, limit - session); 942 943 /* Skip past the session id */ 944 if (!CBS_skip(&session_id, session_len)) 945 return -1; 946 947 /* Skip past DTLS cookie */ 948 if (SSL_IS_DTLS(s)) { 949 if (!CBS_get_u8_length_prefixed(&session_id, &cookie)) 950 return -1; 951 } 952 953 /* Skip past cipher list */ 954 if (!CBS_get_u16_length_prefixed(&session_id, &cipher_list)) 955 return -1; 956 957 /* Skip past compression algorithm list */ 958 if (!CBS_get_u8_length_prefixed(&session_id, &compress_algo)) 959 return -1; 960 961 /* Now at start of extensions */ 962 if (CBS_len(&session_id) == 0) 963 return 0; 964 if (!CBS_get_u16_length_prefixed(&session_id, &extensions)) 965 return -1; 966 967 while (CBS_len(&extensions) > 0) { 968 CBS ext_data; 969 uint16_t ext_type; 970 971 if (!CBS_get_u16(&extensions, &ext_type) || 972 !CBS_get_u16_length_prefixed(&extensions, &ext_data)) 973 return -1; 974 975 if (ext_type == TLSEXT_TYPE_session_ticket) { 976 int r; 977 if (CBS_len(&ext_data) == 0) { 978 /* The client will accept a ticket but doesn't 979 * currently have one. */ 980 s->internal->tlsext_ticket_expected = 1; 981 return 1; 982 } 983 if (s->internal->tls_session_secret_cb) { 984 /* Indicate that the ticket couldn't be 985 * decrypted rather than generating the session 986 * from ticket now, trigger abbreviated 987 * handshake based on external mechanism to 988 * calculate the master secret later. */ 989 return 2; 990 } 991 992 r = tls_decrypt_ticket(s, CBS_data(&ext_data), 993 CBS_len(&ext_data), session, session_len, ret); 994 995 switch (r) { 996 case 2: /* ticket couldn't be decrypted */ 997 s->internal->tlsext_ticket_expected = 1; 998 return 2; 999 case 3: /* ticket was decrypted */ 1000 return r; 1001 case 4: /* ticket decrypted but need to renew */ 1002 s->internal->tlsext_ticket_expected = 1; 1003 return 3; 1004 default: /* fatal error */ 1005 return -1; 1006 } 1007 } 1008 } 1009 return 0; 1010 } 1011 1012 /* tls_decrypt_ticket attempts to decrypt a session ticket. 1013 * 1014 * etick: points to the body of the session ticket extension. 1015 * eticklen: the length of the session tickets extenion. 1016 * sess_id: points at the session ID. 1017 * sesslen: the length of the session ID. 1018 * psess: (output) on return, if a ticket was decrypted, then this is set to 1019 * point to the resulting session. 1020 * 1021 * Returns: 1022 * -1: fatal error, either from parsing or decrypting the ticket. 1023 * 2: the ticket couldn't be decrypted. 1024 * 3: a ticket was successfully decrypted and *psess was set. 1025 * 4: same as 3, but the ticket needs to be renewed. 1026 */ 1027 static int 1028 tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen, 1029 const unsigned char *sess_id, int sesslen, SSL_SESSION **psess) 1030 { 1031 SSL_SESSION *sess; 1032 unsigned char *sdec; 1033 const unsigned char *p; 1034 int slen, mlen, renew_ticket = 0; 1035 unsigned char tick_hmac[EVP_MAX_MD_SIZE]; 1036 HMAC_CTX hctx; 1037 EVP_CIPHER_CTX ctx; 1038 SSL_CTX *tctx = s->initial_ctx; 1039 1040 /* 1041 * The API guarantees EVP_MAX_IV_LENGTH bytes of space for 1042 * the iv to tlsext_ticket_key_cb(). Since the total space 1043 * required for a session cookie is never less than this, 1044 * this check isn't too strict. The exact check comes later. 1045 */ 1046 if (eticklen < 16 + EVP_MAX_IV_LENGTH) 1047 return 2; 1048 1049 /* Initialize session ticket encryption and HMAC contexts */ 1050 HMAC_CTX_init(&hctx); 1051 EVP_CIPHER_CTX_init(&ctx); 1052 if (tctx->internal->tlsext_ticket_key_cb) { 1053 unsigned char *nctick = (unsigned char *)etick; 1054 int rv = tctx->internal->tlsext_ticket_key_cb(s, 1055 nctick, nctick + 16, &ctx, &hctx, 0); 1056 if (rv < 0) { 1057 HMAC_CTX_cleanup(&hctx); 1058 EVP_CIPHER_CTX_cleanup(&ctx); 1059 return -1; 1060 } 1061 if (rv == 0) { 1062 HMAC_CTX_cleanup(&hctx); 1063 EVP_CIPHER_CTX_cleanup(&ctx); 1064 return 2; 1065 } 1066 if (rv == 2) 1067 renew_ticket = 1; 1068 } else { 1069 /* Check key name matches */ 1070 if (timingsafe_memcmp(etick, 1071 tctx->internal->tlsext_tick_key_name, 16)) 1072 return 2; 1073 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 1074 16, tlsext_tick_md(), NULL); 1075 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1076 tctx->internal->tlsext_tick_aes_key, etick + 16); 1077 } 1078 1079 /* 1080 * Attempt to process session ticket, first conduct sanity and 1081 * integrity checks on ticket. 1082 */ 1083 mlen = HMAC_size(&hctx); 1084 if (mlen < 0) { 1085 HMAC_CTX_cleanup(&hctx); 1086 EVP_CIPHER_CTX_cleanup(&ctx); 1087 return -1; 1088 } 1089 1090 /* Sanity check ticket length: must exceed keyname + IV + HMAC */ 1091 if (eticklen <= 16 + EVP_CIPHER_CTX_iv_length(&ctx) + mlen) { 1092 HMAC_CTX_cleanup(&hctx); 1093 EVP_CIPHER_CTX_cleanup(&ctx); 1094 return 2; 1095 } 1096 eticklen -= mlen; 1097 1098 /* Check HMAC of encrypted ticket */ 1099 if (HMAC_Update(&hctx, etick, eticklen) <= 0 || 1100 HMAC_Final(&hctx, tick_hmac, NULL) <= 0) { 1101 HMAC_CTX_cleanup(&hctx); 1102 EVP_CIPHER_CTX_cleanup(&ctx); 1103 return -1; 1104 } 1105 1106 HMAC_CTX_cleanup(&hctx); 1107 if (timingsafe_memcmp(tick_hmac, etick + eticklen, mlen)) { 1108 EVP_CIPHER_CTX_cleanup(&ctx); 1109 return 2; 1110 } 1111 1112 /* Attempt to decrypt session data */ 1113 /* Move p after IV to start of encrypted ticket, update length */ 1114 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1115 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx); 1116 sdec = malloc(eticklen); 1117 if (sdec == NULL || 1118 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen) <= 0) { 1119 free(sdec); 1120 EVP_CIPHER_CTX_cleanup(&ctx); 1121 return -1; 1122 } 1123 if (EVP_DecryptFinal_ex(&ctx, sdec + slen, &mlen) <= 0) { 1124 free(sdec); 1125 EVP_CIPHER_CTX_cleanup(&ctx); 1126 return 2; 1127 } 1128 slen += mlen; 1129 EVP_CIPHER_CTX_cleanup(&ctx); 1130 p = sdec; 1131 1132 sess = d2i_SSL_SESSION(NULL, &p, slen); 1133 free(sdec); 1134 if (sess) { 1135 /* The session ID, if non-empty, is used by some clients to 1136 * detect that the ticket has been accepted. So we copy it to 1137 * the session structure. If it is empty set length to zero 1138 * as required by standard. 1139 */ 1140 if (sesslen) 1141 memcpy(sess->session_id, sess_id, sesslen); 1142 sess->session_id_length = sesslen; 1143 *psess = sess; 1144 if (renew_ticket) 1145 return 4; 1146 else 1147 return 3; 1148 } 1149 ERR_clear_error(); 1150 /* For session parse failure, indicate that we need to send a new 1151 * ticket. */ 1152 return 2; 1153 } 1154 1155 /* Tables to translate from NIDs to TLS v1.2 ids */ 1156 1157 typedef struct { 1158 int nid; 1159 int id; 1160 } tls12_lookup; 1161 1162 static tls12_lookup tls12_md[] = { 1163 {NID_md5, TLSEXT_hash_md5}, 1164 {NID_sha1, TLSEXT_hash_sha1}, 1165 {NID_sha224, TLSEXT_hash_sha224}, 1166 {NID_sha256, TLSEXT_hash_sha256}, 1167 {NID_sha384, TLSEXT_hash_sha384}, 1168 {NID_sha512, TLSEXT_hash_sha512}, 1169 {NID_id_GostR3411_94, TLSEXT_hash_gost94}, 1170 {NID_id_tc26_gost3411_2012_256, TLSEXT_hash_streebog_256}, 1171 {NID_id_tc26_gost3411_2012_512, TLSEXT_hash_streebog_512} 1172 }; 1173 1174 static tls12_lookup tls12_sig[] = { 1175 {EVP_PKEY_RSA, TLSEXT_signature_rsa}, 1176 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}, 1177 {EVP_PKEY_GOSTR01, TLSEXT_signature_gostr01}, 1178 }; 1179 1180 static int 1181 tls12_find_id(int nid, tls12_lookup *table, size_t tlen) 1182 { 1183 size_t i; 1184 for (i = 0; i < tlen; i++) { 1185 if (table[i].nid == nid) 1186 return table[i].id; 1187 } 1188 return -1; 1189 } 1190 1191 int 1192 tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md) 1193 { 1194 int sig_id, md_id; 1195 if (!md) 1196 return 0; 1197 md_id = tls12_find_id(EVP_MD_type(md), tls12_md, 1198 sizeof(tls12_md) / sizeof(tls12_lookup)); 1199 if (md_id == -1) 1200 return 0; 1201 sig_id = tls12_get_sigid(pk); 1202 if (sig_id == -1) 1203 return 0; 1204 p[0] = (unsigned char)md_id; 1205 p[1] = (unsigned char)sig_id; 1206 return 1; 1207 } 1208 1209 int 1210 tls12_get_sigid(const EVP_PKEY *pk) 1211 { 1212 return tls12_find_id(pk->type, tls12_sig, 1213 sizeof(tls12_sig) / sizeof(tls12_lookup)); 1214 } 1215 1216 const EVP_MD * 1217 tls12_get_hash(unsigned char hash_alg) 1218 { 1219 switch (hash_alg) { 1220 case TLSEXT_hash_sha1: 1221 return EVP_sha1(); 1222 case TLSEXT_hash_sha224: 1223 return EVP_sha224(); 1224 case TLSEXT_hash_sha256: 1225 return EVP_sha256(); 1226 case TLSEXT_hash_sha384: 1227 return EVP_sha384(); 1228 case TLSEXT_hash_sha512: 1229 return EVP_sha512(); 1230 #ifndef OPENSSL_NO_GOST 1231 case TLSEXT_hash_gost94: 1232 return EVP_gostr341194(); 1233 case TLSEXT_hash_streebog_256: 1234 return EVP_streebog256(); 1235 case TLSEXT_hash_streebog_512: 1236 return EVP_streebog512(); 1237 #endif 1238 default: 1239 return NULL; 1240 } 1241 } 1242 1243 /* Set preferred digest for each key type */ 1244 1245 int 1246 tls1_process_sigalgs(SSL *s, CBS *cbs) 1247 { 1248 const EVP_MD *md; 1249 CERT *c = s->cert; 1250 int idx; 1251 1252 /* Extension ignored for inappropriate versions */ 1253 if (!SSL_USE_SIGALGS(s)) 1254 return 1; 1255 1256 /* Should never happen */ 1257 if (c == NULL) 1258 return 0; 1259 1260 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL; 1261 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL; 1262 c->pkeys[SSL_PKEY_ECC].digest = NULL; 1263 c->pkeys[SSL_PKEY_GOST01].digest = NULL; 1264 1265 while (CBS_len(cbs) > 0) { 1266 uint8_t hash_alg, sig_alg; 1267 1268 if (!CBS_get_u8(cbs, &hash_alg) || !CBS_get_u8(cbs, &sig_alg)) 1269 return 0; 1270 1271 switch (sig_alg) { 1272 case TLSEXT_signature_rsa: 1273 idx = SSL_PKEY_RSA_SIGN; 1274 break; 1275 case TLSEXT_signature_ecdsa: 1276 idx = SSL_PKEY_ECC; 1277 break; 1278 case TLSEXT_signature_gostr01: 1279 case TLSEXT_signature_gostr12_256: 1280 case TLSEXT_signature_gostr12_512: 1281 idx = SSL_PKEY_GOST01; 1282 break; 1283 default: 1284 continue; 1285 } 1286 1287 if (c->pkeys[idx].digest == NULL) { 1288 md = tls12_get_hash(hash_alg); 1289 if (md) { 1290 c->pkeys[idx].digest = md; 1291 if (idx == SSL_PKEY_RSA_SIGN) 1292 c->pkeys[SSL_PKEY_RSA_ENC].digest = md; 1293 } 1294 } 1295 1296 } 1297 1298 /* 1299 * Set any remaining keys to default values. NOTE: if alg is not 1300 * supported it stays as NULL. 1301 */ 1302 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) { 1303 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1(); 1304 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1(); 1305 } 1306 if (!c->pkeys[SSL_PKEY_ECC].digest) 1307 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1(); 1308 #ifndef OPENSSL_NO_GOST 1309 if (!c->pkeys[SSL_PKEY_GOST01].digest) 1310 c->pkeys[SSL_PKEY_GOST01].digest = EVP_gostr341194(); 1311 #endif 1312 return 1; 1313 } 1314