1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2005 Nokia. All rights reserved. 112 * 113 * The portions of the attached software ("Contribution") is developed by 114 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 115 * license. 116 * 117 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 118 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 119 * support (see RFC 4279) to OpenSSL. 120 * 121 * No patent licenses or other rights except those expressly stated in 122 * the OpenSSL open source license shall be deemed granted or received 123 * expressly, by implication, estoppel, or otherwise. 124 * 125 * No assurances are provided by Nokia that the Contribution does not 126 * infringe the patent or other intellectual property rights of any third 127 * party or that the license provides you with all the necessary rights 128 * to make use of the Contribution. 129 * 130 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 131 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 132 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 133 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 134 * OTHERWISE. */ 135 136 #include <assert.h> 137 #include <stdio.h> 138 #include <string.h> 139 140 #include <openssl/err.h> 141 #include <openssl/evp.h> 142 #include <openssl/hmac.h> 143 #include <openssl/md5.h> 144 #include <openssl/mem.h> 145 #include <openssl/obj.h> 146 #include <openssl/rand.h> 147 148 #include "internal.h" 149 150 151 /* tls1_P_hash computes the TLS P_<hash> function as described in RFC 5246, 152 * section 5. It writes |out_len| bytes to |out|, using |md| as the hash and 153 * |secret| as the secret. |seed1| through |seed3| are concatenated to form the 154 * seed parameter. It returns one on success and zero on failure. */ 155 static int tls1_P_hash(uint8_t *out, size_t out_len, const EVP_MD *md, 156 const uint8_t *secret, size_t secret_len, 157 const uint8_t *seed1, size_t seed1_len, 158 const uint8_t *seed2, size_t seed2_len, 159 const uint8_t *seed3, size_t seed3_len) { 160 size_t chunk; 161 HMAC_CTX ctx, ctx_tmp, ctx_init; 162 uint8_t A1[EVP_MAX_MD_SIZE]; 163 unsigned A1_len; 164 int ret = 0; 165 166 chunk = EVP_MD_size(md); 167 168 HMAC_CTX_init(&ctx); 169 HMAC_CTX_init(&ctx_tmp); 170 HMAC_CTX_init(&ctx_init); 171 if (!HMAC_Init_ex(&ctx_init, secret, secret_len, md, NULL) || 172 !HMAC_CTX_copy_ex(&ctx, &ctx_init) || 173 (seed1_len && !HMAC_Update(&ctx, seed1, seed1_len)) || 174 (seed2_len && !HMAC_Update(&ctx, seed2, seed2_len)) || 175 (seed3_len && !HMAC_Update(&ctx, seed3, seed3_len)) || 176 !HMAC_Final(&ctx, A1, &A1_len)) { 177 goto err; 178 } 179 180 for (;;) { 181 /* Reinit mac contexts. */ 182 if (!HMAC_CTX_copy_ex(&ctx, &ctx_init) || 183 !HMAC_Update(&ctx, A1, A1_len) || 184 (out_len > chunk && !HMAC_CTX_copy_ex(&ctx_tmp, &ctx)) || 185 (seed1_len && !HMAC_Update(&ctx, seed1, seed1_len)) || 186 (seed2_len && !HMAC_Update(&ctx, seed2, seed2_len)) || 187 (seed3_len && !HMAC_Update(&ctx, seed3, seed3_len))) { 188 goto err; 189 } 190 191 if (out_len > chunk) { 192 unsigned len; 193 if (!HMAC_Final(&ctx, out, &len)) { 194 goto err; 195 } 196 assert(len == chunk); 197 out += len; 198 out_len -= len; 199 /* Calculate the next A1 value. */ 200 if (!HMAC_Final(&ctx_tmp, A1, &A1_len)) { 201 goto err; 202 } 203 } else { 204 /* Last chunk. */ 205 if (!HMAC_Final(&ctx, A1, &A1_len)) { 206 goto err; 207 } 208 memcpy(out, A1, out_len); 209 break; 210 } 211 } 212 213 ret = 1; 214 215 err: 216 HMAC_CTX_cleanup(&ctx); 217 HMAC_CTX_cleanup(&ctx_tmp); 218 HMAC_CTX_cleanup(&ctx_init); 219 OPENSSL_cleanse(A1, sizeof(A1)); 220 return ret; 221 } 222 223 int tls1_prf(SSL *s, uint8_t *out, size_t out_len, const uint8_t *secret, 224 size_t secret_len, const char *label, size_t label_len, 225 const uint8_t *seed1, size_t seed1_len, 226 const uint8_t *seed2, size_t seed2_len) { 227 size_t idx, len, count, i; 228 const uint8_t *S1; 229 uint32_t m; 230 const EVP_MD *md; 231 int ret = 0; 232 uint8_t *tmp; 233 234 if (out_len == 0) { 235 return 1; 236 } 237 238 /* Allocate a temporary buffer. */ 239 tmp = OPENSSL_malloc(out_len); 240 if (tmp == NULL) { 241 OPENSSL_PUT_ERROR(SSL, tls1_prf, ERR_R_MALLOC_FAILURE); 242 return 0; 243 } 244 245 /* Count number of digests and partition |secret| evenly. */ 246 count = 0; 247 for (idx = 0; ssl_get_handshake_digest(&m, &md, idx); idx++) { 248 if (m & ssl_get_algorithm2(s)) { 249 count++; 250 } 251 } 252 /* TODO(davidben): The only case where count isn't 1 is the old MD5/SHA-1 253 * combination. The logic around multiple handshake digests can probably be 254 * simplified. */ 255 assert(count == 1 || count == 2); 256 len = secret_len / count; 257 if (count == 1) { 258 secret_len = 0; 259 } 260 S1 = secret; 261 memset(out, 0, out_len); 262 for (idx = 0; ssl_get_handshake_digest(&m, &md, idx); idx++) { 263 if (m & ssl_get_algorithm2(s)) { 264 /* If |count| is 2 and |secret_len| is odd, |secret| is partitioned into 265 * two halves with an overlapping byte. */ 266 if (!tls1_P_hash(tmp, out_len, md, S1, len + (secret_len & 1), 267 (const uint8_t *)label, label_len, seed1, seed1_len, 268 seed2, seed2_len)) { 269 goto err; 270 } 271 S1 += len; 272 for (i = 0; i < out_len; i++) { 273 out[i] ^= tmp[i]; 274 } 275 } 276 } 277 ret = 1; 278 279 err: 280 OPENSSL_cleanse(tmp, out_len); 281 OPENSSL_free(tmp); 282 return ret; 283 } 284 285 static int tls1_generate_key_block(SSL *s, uint8_t *out, size_t out_len) { 286 return s->enc_method->prf(s, out, out_len, s->session->master_key, 287 s->session->master_key_length, 288 TLS_MD_KEY_EXPANSION_CONST, 289 TLS_MD_KEY_EXPANSION_CONST_SIZE, 290 s->s3->server_random, SSL3_RANDOM_SIZE, 291 s->s3->client_random, 292 SSL3_RANDOM_SIZE); 293 } 294 295 int tls1_change_cipher_state(SSL *s, int which) { 296 /* is_read is true if we have just read a ChangeCipherSpec message - i.e. we 297 * need to update the read cipherspec. Otherwise we have just written one. */ 298 const char is_read = (which & SSL3_CC_READ) != 0; 299 /* use_client_keys is true if we wish to use the keys for the "client write" 300 * direction. This is the case if we're a client sending a ChangeCipherSpec, 301 * or a server reading a client's ChangeCipherSpec. */ 302 const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE || 303 which == SSL3_CHANGE_CIPHER_SERVER_READ; 304 const uint8_t *client_write_mac_secret, *server_write_mac_secret, *mac_secret; 305 const uint8_t *client_write_key, *server_write_key, *key; 306 const uint8_t *client_write_iv, *server_write_iv, *iv; 307 const EVP_AEAD *aead = s->s3->tmp.new_aead; 308 size_t key_len, iv_len, mac_secret_len; 309 const uint8_t *key_data; 310 311 /* Reset sequence number to zero. */ 312 if (!SSL_IS_DTLS(s)) { 313 memset(is_read ? s->s3->read_sequence : s->s3->write_sequence, 0, 8); 314 } 315 316 mac_secret_len = s->s3->tmp.new_mac_secret_len; 317 iv_len = s->s3->tmp.new_fixed_iv_len; 318 319 if (aead == NULL) { 320 OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_INTERNAL_ERROR); 321 return 0; 322 } 323 324 key_len = EVP_AEAD_key_length(aead); 325 if (mac_secret_len > 0) { 326 /* For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher 327 * suites) the key length reported by |EVP_AEAD_key_length| will 328 * include the MAC and IV key bytes. */ 329 if (key_len < mac_secret_len + iv_len) { 330 OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_INTERNAL_ERROR); 331 return 0; 332 } 333 key_len -= mac_secret_len + iv_len; 334 } 335 336 key_data = s->s3->tmp.key_block; 337 client_write_mac_secret = key_data; 338 key_data += mac_secret_len; 339 server_write_mac_secret = key_data; 340 key_data += mac_secret_len; 341 client_write_key = key_data; 342 key_data += key_len; 343 server_write_key = key_data; 344 key_data += key_len; 345 client_write_iv = key_data; 346 key_data += iv_len; 347 server_write_iv = key_data; 348 key_data += iv_len; 349 350 if (use_client_keys) { 351 mac_secret = client_write_mac_secret; 352 key = client_write_key; 353 iv = client_write_iv; 354 } else { 355 mac_secret = server_write_mac_secret; 356 key = server_write_key; 357 iv = server_write_iv; 358 } 359 360 if (key_data - s->s3->tmp.key_block != s->s3->tmp.key_block_length) { 361 OPENSSL_PUT_ERROR(SSL, tls1_change_cipher_state, ERR_R_INTERNAL_ERROR); 362 return 0; 363 } 364 365 if (is_read) { 366 SSL_AEAD_CTX_free(s->aead_read_ctx); 367 s->aead_read_ctx = SSL_AEAD_CTX_new( 368 evp_aead_open, ssl3_version_from_wire(s, s->version), 369 s->s3->tmp.new_cipher, key, key_len, mac_secret, mac_secret_len, iv, 370 iv_len); 371 return s->aead_read_ctx != NULL; 372 } else { 373 SSL_AEAD_CTX_free(s->aead_write_ctx); 374 s->aead_write_ctx = SSL_AEAD_CTX_new( 375 evp_aead_seal, ssl3_version_from_wire(s, s->version), 376 s->s3->tmp.new_cipher, key, key_len, mac_secret, mac_secret_len, iv, 377 iv_len); 378 return s->aead_write_ctx != NULL; 379 } 380 } 381 382 int tls1_setup_key_block(SSL *s) { 383 uint8_t *p; 384 const EVP_AEAD *aead = NULL; 385 int ret = 0; 386 size_t mac_secret_len, fixed_iv_len, variable_iv_len, key_len; 387 size_t key_block_len; 388 389 if (s->s3->tmp.key_block_length != 0) { 390 return 1; 391 } 392 393 if (s->session->cipher == NULL) { 394 goto cipher_unavailable_err; 395 } 396 397 if (!ssl_cipher_get_evp_aead(&aead, &mac_secret_len, &fixed_iv_len, 398 s->session->cipher, 399 ssl3_version_from_wire(s, s->version))) { 400 goto cipher_unavailable_err; 401 } 402 key_len = EVP_AEAD_key_length(aead); 403 variable_iv_len = EVP_AEAD_nonce_length(aead); 404 if (mac_secret_len > 0) { 405 /* For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the 406 * key length reported by |EVP_AEAD_key_length| will include the MAC key 407 * bytes and initial implicit IV. */ 408 if (key_len < mac_secret_len + fixed_iv_len) { 409 OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, ERR_R_INTERNAL_ERROR); 410 return 0; 411 } 412 key_len -= mac_secret_len + fixed_iv_len; 413 } else { 414 /* The nonce is split into a fixed portion and a variable portion. */ 415 if (variable_iv_len < fixed_iv_len) { 416 OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, ERR_R_INTERNAL_ERROR); 417 return 0; 418 } 419 variable_iv_len -= fixed_iv_len; 420 } 421 422 assert(mac_secret_len < 256); 423 assert(fixed_iv_len < 256); 424 assert(variable_iv_len < 256); 425 426 s->s3->tmp.new_aead = aead; 427 s->s3->tmp.new_mac_secret_len = (uint8_t)mac_secret_len; 428 s->s3->tmp.new_fixed_iv_len = (uint8_t)fixed_iv_len; 429 s->s3->tmp.new_variable_iv_len = (uint8_t)variable_iv_len; 430 431 key_block_len = key_len + mac_secret_len + fixed_iv_len; 432 key_block_len *= 2; 433 434 ssl3_cleanup_key_block(s); 435 436 p = (uint8_t *)OPENSSL_malloc(key_block_len); 437 if (p == NULL) { 438 OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, ERR_R_MALLOC_FAILURE); 439 goto err; 440 } 441 442 s->s3->tmp.key_block_length = key_block_len; 443 s->s3->tmp.key_block = p; 444 445 if (!tls1_generate_key_block(s, p, key_block_len)) { 446 goto err; 447 } 448 449 if (!SSL_USE_EXPLICIT_IV(s) && 450 (s->mode & SSL_MODE_CBC_RECORD_SPLITTING) != 0) { 451 /* enable vulnerability countermeasure for CBC ciphers with known-IV 452 * problem (http://www.openssl.org/~bodo/tls-cbc.txt). */ 453 s->s3->need_record_splitting = 1; 454 455 if (s->session->cipher != NULL && 456 s->session->cipher->algorithm_enc == SSL_RC4) { 457 s->s3->need_record_splitting = 0; 458 } 459 } 460 461 ret = 1; 462 463 err: 464 return ret; 465 466 cipher_unavailable_err: 467 OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, 468 SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 469 return 0; 470 } 471 472 int tls1_cert_verify_mac(SSL *s, int md_nid, uint8_t *out) { 473 unsigned int ret; 474 EVP_MD_CTX ctx, *d = NULL; 475 int i; 476 477 if (s->s3->handshake_buffer && 478 !ssl3_digest_cached_records(s, free_handshake_buffer)) { 479 return 0; 480 } 481 482 for (i = 0; i < SSL_MAX_DIGEST; i++) { 483 if (s->s3->handshake_dgst[i] && 484 EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) { 485 d = s->s3->handshake_dgst[i]; 486 break; 487 } 488 } 489 490 if (!d) { 491 OPENSSL_PUT_ERROR(SSL, tls1_cert_verify_mac, SSL_R_NO_REQUIRED_DIGEST); 492 return 0; 493 } 494 495 EVP_MD_CTX_init(&ctx); 496 if (!EVP_MD_CTX_copy_ex(&ctx, d)) { 497 EVP_MD_CTX_cleanup(&ctx); 498 return 0; 499 } 500 EVP_DigestFinal_ex(&ctx, out, &ret); 501 EVP_MD_CTX_cleanup(&ctx); 502 503 return ret; 504 } 505 506 /* tls1_handshake_digest calculates the current handshake hash and writes it to 507 * |out|, which has space for |out_len| bytes. It returns the number of bytes 508 * written or -1 in the event of an error. This function works on a copy of the 509 * underlying digests so can be called multiple times and prior to the final 510 * update etc. */ 511 int tls1_handshake_digest(SSL *s, uint8_t *out, size_t out_len) { 512 const EVP_MD *md; 513 EVP_MD_CTX ctx; 514 int err = 0, len = 0; 515 size_t i; 516 uint32_t mask; 517 518 EVP_MD_CTX_init(&ctx); 519 520 for (i = 0; ssl_get_handshake_digest(&mask, &md, i); i++) { 521 size_t hash_size; 522 unsigned int digest_len; 523 EVP_MD_CTX *hdgst = s->s3->handshake_dgst[i]; 524 525 if ((mask & ssl_get_algorithm2(s)) == 0) { 526 continue; 527 } 528 529 hash_size = EVP_MD_size(md); 530 if (!hdgst || 531 hash_size > out_len || 532 !EVP_MD_CTX_copy_ex(&ctx, hdgst) || 533 !EVP_DigestFinal_ex(&ctx, out, &digest_len) || 534 digest_len != hash_size /* internal error */) { 535 err = 1; 536 break; 537 } 538 539 out += digest_len; 540 out_len -= digest_len; 541 len += digest_len; 542 } 543 544 EVP_MD_CTX_cleanup(&ctx); 545 546 if (err != 0) { 547 return -1; 548 } 549 return len; 550 } 551 552 int tls1_final_finish_mac(SSL *s, const char *str, int slen, uint8_t *out) { 553 uint8_t buf[2 * EVP_MAX_MD_SIZE]; 554 int err = 0; 555 int digests_len; 556 557 /* At this point, the handshake should have released the handshake buffer on 558 * its own. 559 * TODO(davidben): Apart from initialization, the handshake buffer should be 560 * orthogonal to the handshake digest. https://crbug.com/492371 */ 561 assert(s->s3->handshake_buffer == NULL); 562 if (s->s3->handshake_buffer && 563 !ssl3_digest_cached_records(s, free_handshake_buffer)) { 564 return 0; 565 } 566 567 digests_len = tls1_handshake_digest(s, buf, sizeof(buf)); 568 if (digests_len < 0) { 569 err = 1; 570 digests_len = 0; 571 } 572 573 if (!s->enc_method->prf(s, out, 12, s->session->master_key, 574 s->session->master_key_length, str, slen, buf, 575 digests_len, NULL, 0)) { 576 err = 1; 577 } 578 579 if (err) { 580 return 0; 581 } else { 582 return 12; 583 } 584 } 585 586 int tls1_generate_master_secret(SSL *s, uint8_t *out, const uint8_t *premaster, 587 size_t premaster_len) { 588 if (s->s3->tmp.extended_master_secret) { 589 uint8_t digests[2 * EVP_MAX_MD_SIZE]; 590 int digests_len; 591 592 /* The master secret is based on the handshake hash just after sending the 593 * ClientKeyExchange. However, we might have a client certificate to send, 594 * in which case we might need different hashes for the verification and 595 * thus still need the handshake buffer around. Keeping both a handshake 596 * buffer *and* running hashes isn't yet supported so, when it comes to 597 * calculating the Finished hash, we'll have to hash the handshake buffer 598 * again. */ 599 if (s->s3->handshake_buffer && 600 !ssl3_digest_cached_records(s, dont_free_handshake_buffer)) { 601 return 0; 602 } 603 604 digests_len = tls1_handshake_digest(s, digests, sizeof(digests)); 605 if (digests_len == -1) { 606 return 0; 607 } 608 609 if (!s->enc_method->prf(s, out, SSL3_MASTER_SECRET_SIZE, premaster, 610 premaster_len, TLS_MD_EXTENDED_MASTER_SECRET_CONST, 611 TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests, 612 digests_len, NULL, 0)) { 613 return 0; 614 } 615 } else { 616 if (!s->enc_method->prf(s, out, SSL3_MASTER_SECRET_SIZE, premaster, 617 premaster_len, TLS_MD_MASTER_SECRET_CONST, 618 TLS_MD_MASTER_SECRET_CONST_SIZE, 619 s->s3->client_random, SSL3_RANDOM_SIZE, 620 s->s3->server_random, SSL3_RANDOM_SIZE)) { 621 return 0; 622 } 623 } 624 625 return SSL3_MASTER_SECRET_SIZE; 626 } 627 628 int tls1_export_keying_material(SSL *s, uint8_t *out, size_t out_len, 629 const char *label, size_t label_len, 630 const uint8_t *context, size_t context_len, 631 int use_context) { 632 if (!s->s3->have_version || s->version == SSL3_VERSION) { 633 OPENSSL_PUT_ERROR(SSL, tls1_export_keying_material, 634 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 635 return 0; 636 } 637 638 size_t seed_len = 2 * SSL3_RANDOM_SIZE; 639 if (use_context) { 640 if (context_len >= 1u << 16) { 641 OPENSSL_PUT_ERROR(SSL, tls1_export_keying_material, ERR_R_OVERFLOW); 642 return 0; 643 } 644 seed_len += 2 + context_len; 645 } 646 uint8_t *seed = OPENSSL_malloc(seed_len); 647 if (seed == NULL) { 648 OPENSSL_PUT_ERROR(SSL, tls1_export_keying_material, ERR_R_MALLOC_FAILURE); 649 return 0; 650 } 651 652 memcpy(seed, s->s3->client_random, SSL3_RANDOM_SIZE); 653 memcpy(seed + SSL3_RANDOM_SIZE, s->s3->server_random, SSL3_RANDOM_SIZE); 654 if (use_context) { 655 seed[2 * SSL3_RANDOM_SIZE] = (uint8_t)(context_len >> 8); 656 seed[2 * SSL3_RANDOM_SIZE + 1] = (uint8_t)context_len; 657 memcpy(seed + 2 * SSL3_RANDOM_SIZE + 2, context, context_len); 658 } 659 660 int ret = s->enc_method->prf(s, out, out_len, s->session->master_key, 661 s->session->master_key_length, label, label_len, 662 seed, seed_len, NULL, 0); 663 OPENSSL_free(seed); 664 return ret; 665 } 666 667 int tls1_alert_code(int code) { 668 switch (code) { 669 case SSL_AD_CLOSE_NOTIFY: 670 return SSL3_AD_CLOSE_NOTIFY; 671 672 case SSL_AD_UNEXPECTED_MESSAGE: 673 return SSL3_AD_UNEXPECTED_MESSAGE; 674 675 case SSL_AD_BAD_RECORD_MAC: 676 return SSL3_AD_BAD_RECORD_MAC; 677 678 case SSL_AD_DECRYPTION_FAILED: 679 return TLS1_AD_DECRYPTION_FAILED; 680 681 case SSL_AD_RECORD_OVERFLOW: 682 return TLS1_AD_RECORD_OVERFLOW; 683 684 case SSL_AD_DECOMPRESSION_FAILURE: 685 return SSL3_AD_DECOMPRESSION_FAILURE; 686 687 case SSL_AD_HANDSHAKE_FAILURE: 688 return SSL3_AD_HANDSHAKE_FAILURE; 689 690 case SSL_AD_NO_CERTIFICATE: 691 return -1; 692 693 case SSL_AD_BAD_CERTIFICATE: 694 return SSL3_AD_BAD_CERTIFICATE; 695 696 case SSL_AD_UNSUPPORTED_CERTIFICATE: 697 return SSL3_AD_UNSUPPORTED_CERTIFICATE; 698 699 case SSL_AD_CERTIFICATE_REVOKED: 700 return SSL3_AD_CERTIFICATE_REVOKED; 701 702 case SSL_AD_CERTIFICATE_EXPIRED: 703 return SSL3_AD_CERTIFICATE_EXPIRED; 704 705 case SSL_AD_CERTIFICATE_UNKNOWN: 706 return SSL3_AD_CERTIFICATE_UNKNOWN; 707 708 case SSL_AD_ILLEGAL_PARAMETER: 709 return SSL3_AD_ILLEGAL_PARAMETER; 710 711 case SSL_AD_UNKNOWN_CA: 712 return TLS1_AD_UNKNOWN_CA; 713 714 case SSL_AD_ACCESS_DENIED: 715 return TLS1_AD_ACCESS_DENIED; 716 717 case SSL_AD_DECODE_ERROR: 718 return TLS1_AD_DECODE_ERROR; 719 720 case SSL_AD_DECRYPT_ERROR: 721 return TLS1_AD_DECRYPT_ERROR; 722 case SSL_AD_EXPORT_RESTRICTION: 723 return TLS1_AD_EXPORT_RESTRICTION; 724 725 case SSL_AD_PROTOCOL_VERSION: 726 return TLS1_AD_PROTOCOL_VERSION; 727 728 case SSL_AD_INSUFFICIENT_SECURITY: 729 return TLS1_AD_INSUFFICIENT_SECURITY; 730 731 case SSL_AD_INTERNAL_ERROR: 732 return TLS1_AD_INTERNAL_ERROR; 733 734 case SSL_AD_USER_CANCELLED: 735 return TLS1_AD_USER_CANCELLED; 736 737 case SSL_AD_NO_RENEGOTIATION: 738 return TLS1_AD_NO_RENEGOTIATION; 739 740 case SSL_AD_UNSUPPORTED_EXTENSION: 741 return TLS1_AD_UNSUPPORTED_EXTENSION; 742 743 case SSL_AD_CERTIFICATE_UNOBTAINABLE: 744 return TLS1_AD_CERTIFICATE_UNOBTAINABLE; 745 746 case SSL_AD_UNRECOGNIZED_NAME: 747 return TLS1_AD_UNRECOGNIZED_NAME; 748 749 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: 750 return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 751 752 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: 753 return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE; 754 755 case SSL_AD_UNKNOWN_PSK_IDENTITY: 756 return TLS1_AD_UNKNOWN_PSK_IDENTITY; 757 758 case SSL_AD_INAPPROPRIATE_FALLBACK: 759 return SSL3_AD_INAPPROPRIATE_FALLBACK; 760 761 default: 762 return -1; 763 } 764 } 765
