1 /* $OpenBSD: t1_enc.c,v 1.132 2021/02/03 15:14:44 tb 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 * Copyright 2005 Nokia. All rights reserved. 113 * 114 * The portions of the attached software ("Contribution") is developed by 115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 116 * license. 117 * 118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 120 * support (see RFC 4279) to OpenSSL. 121 * 122 * No patent licenses or other rights except those expressly stated in 123 * the OpenSSL open source license shall be deemed granted or received 124 * expressly, by implication, estoppel, or otherwise. 125 * 126 * No assurances are provided by Nokia that the Contribution does not 127 * infringe the patent or other intellectual property rights of any third 128 * party or that the license provides you with all the necessary rights 129 * to make use of the Contribution. 130 * 131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 135 * OTHERWISE. 136 */ 137 138 #include <limits.h> 139 #include <stdio.h> 140 141 #include "ssl_locl.h" 142 143 #include <openssl/evp.h> 144 #include <openssl/hmac.h> 145 #include <openssl/md5.h> 146 147 int tls1_PRF(SSL *s, const unsigned char *secret, size_t secret_len, 148 const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, 149 const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, 150 const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len); 151 152 void 153 tls1_cleanup_key_block(SSL *s) 154 { 155 freezero(S3I(s)->hs.key_block, S3I(s)->hs.key_block_len); 156 S3I(s)->hs.key_block = NULL; 157 S3I(s)->hs.key_block_len = 0; 158 } 159 160 void 161 tls1_record_sequence_increment(unsigned char *seq) 162 { 163 int i; 164 165 for (i = SSL3_SEQUENCE_SIZE - 1; i >= 0; i--) { 166 if (++seq[i] != 0) 167 break; 168 } 169 } 170 171 /* 172 * TLS P_hash() data expansion function - see RFC 5246, section 5. 173 */ 174 static int 175 tls1_P_hash(const EVP_MD *md, const unsigned char *secret, size_t secret_len, 176 const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, 177 const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, 178 const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len) 179 { 180 unsigned char A1[EVP_MAX_MD_SIZE], hmac[EVP_MAX_MD_SIZE]; 181 size_t A1_len, hmac_len; 182 EVP_MD_CTX ctx; 183 EVP_PKEY *mac_key; 184 int ret = 0; 185 int chunk; 186 size_t i; 187 188 chunk = EVP_MD_size(md); 189 OPENSSL_assert(chunk >= 0); 190 191 EVP_MD_CTX_init(&ctx); 192 193 mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, secret, secret_len); 194 if (!mac_key) 195 goto err; 196 if (!EVP_DigestSignInit(&ctx, NULL, md, NULL, mac_key)) 197 goto err; 198 if (seed1 && !EVP_DigestSignUpdate(&ctx, seed1, seed1_len)) 199 goto err; 200 if (seed2 && !EVP_DigestSignUpdate(&ctx, seed2, seed2_len)) 201 goto err; 202 if (seed3 && !EVP_DigestSignUpdate(&ctx, seed3, seed3_len)) 203 goto err; 204 if (seed4 && !EVP_DigestSignUpdate(&ctx, seed4, seed4_len)) 205 goto err; 206 if (seed5 && !EVP_DigestSignUpdate(&ctx, seed5, seed5_len)) 207 goto err; 208 if (!EVP_DigestSignFinal(&ctx, A1, &A1_len)) 209 goto err; 210 211 for (;;) { 212 if (!EVP_DigestSignInit(&ctx, NULL, md, NULL, mac_key)) 213 goto err; 214 if (!EVP_DigestSignUpdate(&ctx, A1, A1_len)) 215 goto err; 216 if (seed1 && !EVP_DigestSignUpdate(&ctx, seed1, seed1_len)) 217 goto err; 218 if (seed2 && !EVP_DigestSignUpdate(&ctx, seed2, seed2_len)) 219 goto err; 220 if (seed3 && !EVP_DigestSignUpdate(&ctx, seed3, seed3_len)) 221 goto err; 222 if (seed4 && !EVP_DigestSignUpdate(&ctx, seed4, seed4_len)) 223 goto err; 224 if (seed5 && !EVP_DigestSignUpdate(&ctx, seed5, seed5_len)) 225 goto err; 226 if (!EVP_DigestSignFinal(&ctx, hmac, &hmac_len)) 227 goto err; 228 229 if (hmac_len > out_len) 230 hmac_len = out_len; 231 232 for (i = 0; i < hmac_len; i++) 233 out[i] ^= hmac[i]; 234 235 out += hmac_len; 236 out_len -= hmac_len; 237 238 if (out_len == 0) 239 break; 240 241 if (!EVP_DigestSignInit(&ctx, NULL, md, NULL, mac_key)) 242 goto err; 243 if (!EVP_DigestSignUpdate(&ctx, A1, A1_len)) 244 goto err; 245 if (!EVP_DigestSignFinal(&ctx, A1, &A1_len)) 246 goto err; 247 } 248 ret = 1; 249 250 err: 251 EVP_PKEY_free(mac_key); 252 EVP_MD_CTX_cleanup(&ctx); 253 254 explicit_bzero(A1, sizeof(A1)); 255 explicit_bzero(hmac, sizeof(hmac)); 256 257 return ret; 258 } 259 260 int 261 tls1_PRF(SSL *s, const unsigned char *secret, size_t secret_len, 262 const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, 263 const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, 264 const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len) 265 { 266 const EVP_MD *md; 267 size_t half_len; 268 269 memset(out, 0, out_len); 270 271 if (!ssl_get_handshake_evp_md(s, &md)) 272 return (0); 273 274 if (md->type == NID_md5_sha1) { 275 /* 276 * Partition secret between MD5 and SHA1, then XOR result. 277 * If the secret length is odd, a one byte overlap is used. 278 */ 279 half_len = secret_len - (secret_len / 2); 280 if (!tls1_P_hash(EVP_md5(), secret, half_len, seed1, seed1_len, 281 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, 282 seed5, seed5_len, out, out_len)) 283 return (0); 284 285 secret += secret_len - half_len; 286 if (!tls1_P_hash(EVP_sha1(), secret, half_len, seed1, seed1_len, 287 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, 288 seed5, seed5_len, out, out_len)) 289 return (0); 290 291 return (1); 292 } 293 294 if (!tls1_P_hash(md, secret, secret_len, seed1, seed1_len, 295 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, 296 seed5, seed5_len, out, out_len)) 297 return (0); 298 299 return (1); 300 } 301 302 static int 303 tls1_generate_key_block(SSL *s, uint8_t *key_block, size_t key_block_len) 304 { 305 return tls1_PRF(s, 306 s->session->master_key, s->session->master_key_length, 307 TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, 308 s->s3->server_random, SSL3_RANDOM_SIZE, 309 s->s3->client_random, SSL3_RANDOM_SIZE, 310 NULL, 0, NULL, 0, key_block, key_block_len); 311 } 312 313 /* 314 * tls1_change_cipher_state_cipher performs the work needed to switch cipher 315 * states when using EVP_CIPHER. The argument is_read is true iff this function 316 * is being called due to reading, as opposed to writing, a ChangeCipherSpec 317 * message. 318 */ 319 static int 320 tls1_change_cipher_state_cipher(SSL *s, char is_read, 321 const unsigned char *mac_secret, unsigned int mac_secret_size, 322 const unsigned char *key, unsigned int key_len, const unsigned char *iv, 323 unsigned int iv_len) 324 { 325 EVP_CIPHER_CTX *cipher_ctx; 326 const EVP_CIPHER *cipher; 327 EVP_MD_CTX *mac_ctx; 328 EVP_PKEY *mac_key; 329 const EVP_MD *mac; 330 int stream_mac; 331 int mac_type; 332 333 cipher = S3I(s)->tmp.new_sym_enc; 334 mac = S3I(s)->tmp.new_hash; 335 mac_type = S3I(s)->tmp.new_mac_pkey_type; 336 stream_mac = S3I(s)->hs.new_cipher->algorithm2 & TLS1_STREAM_MAC; 337 338 if (is_read) { 339 ssl_clear_cipher_read_state(s); 340 341 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 342 goto err; 343 s->enc_read_ctx = cipher_ctx; 344 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 345 goto err; 346 s->read_hash = mac_ctx; 347 348 if (!tls12_record_layer_set_read_cipher_hash(s->internal->rl, 349 cipher_ctx, mac_ctx, stream_mac)) 350 goto err; 351 352 if (!tls12_record_layer_set_read_mac_key(s->internal->rl, 353 mac_secret, mac_secret_size)) 354 goto err; 355 } else { 356 /* 357 * DTLS fragments retain a pointer to the compression, cipher 358 * and hash contexts, so that it can restore state in order 359 * to perform retransmissions. As such, we cannot free write 360 * contexts that are used for DTLS - these are instead freed 361 * by DTLS when its frees a ChangeCipherSpec fragment. 362 */ 363 if (!SSL_is_dtls(s)) 364 ssl_clear_cipher_write_state(s); 365 366 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 367 goto err; 368 s->internal->enc_write_ctx = cipher_ctx; 369 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 370 goto err; 371 s->internal->write_hash = mac_ctx; 372 373 if (!tls12_record_layer_set_write_cipher_hash(s->internal->rl, 374 cipher_ctx, mac_ctx, stream_mac)) 375 goto err; 376 } 377 378 EVP_CipherInit_ex(cipher_ctx, cipher, NULL, key, iv, !is_read); 379 380 if ((mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret, 381 mac_secret_size)) == NULL) 382 goto err; 383 EVP_DigestSignInit(mac_ctx, NULL, mac, NULL, mac_key); 384 EVP_PKEY_free(mac_key); 385 386 if (S3I(s)->hs.new_cipher->algorithm_enc == SSL_eGOST2814789CNT) { 387 int nid; 388 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 389 nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet; 390 else 391 nid = NID_id_tc26_gost_28147_param_Z; 392 393 EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_GOST_SET_SBOX, nid, 0); 394 if (S3I(s)->hs.new_cipher->algorithm_mac == SSL_GOST89MAC) 395 EVP_MD_CTX_ctrl(mac_ctx, EVP_MD_CTRL_GOST_SET_SBOX, nid, 0); 396 } 397 398 return (1); 399 400 err: 401 SSLerrorx(ERR_R_MALLOC_FAILURE); 402 return (0); 403 } 404 405 int 406 tls1_change_cipher_state(SSL *s, int which) 407 { 408 const unsigned char *client_write_mac_secret, *server_write_mac_secret; 409 const unsigned char *client_write_key, *server_write_key; 410 const unsigned char *client_write_iv, *server_write_iv; 411 const unsigned char *mac_secret, *key, *iv; 412 int mac_secret_size, key_len, iv_len; 413 unsigned char *key_block; 414 const EVP_CIPHER *cipher; 415 const EVP_AEAD *aead; 416 char is_read, use_client_keys; 417 418 cipher = S3I(s)->tmp.new_sym_enc; 419 aead = S3I(s)->tmp.new_aead; 420 421 /* 422 * is_read is true if we have just read a ChangeCipherSpec message, 423 * that is we need to update the read cipherspec. Otherwise we have 424 * just written one. 425 */ 426 is_read = (which & SSL3_CC_READ) != 0; 427 428 /* 429 * use_client_keys is true if we wish to use the keys for the "client 430 * write" direction. This is the case if we're a client sending a 431 * ChangeCipherSpec, or a server reading a client's ChangeCipherSpec. 432 */ 433 use_client_keys = ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 434 (which == SSL3_CHANGE_CIPHER_SERVER_READ)); 435 436 if (aead != NULL) { 437 key_len = EVP_AEAD_key_length(aead); 438 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(S3I(s)->hs.new_cipher); 439 } else { 440 key_len = EVP_CIPHER_key_length(cipher); 441 iv_len = EVP_CIPHER_iv_length(cipher); 442 } 443 444 mac_secret_size = S3I(s)->tmp.new_mac_secret_size; 445 446 key_block = S3I(s)->hs.key_block; 447 client_write_mac_secret = key_block; 448 key_block += mac_secret_size; 449 server_write_mac_secret = key_block; 450 key_block += mac_secret_size; 451 client_write_key = key_block; 452 key_block += key_len; 453 server_write_key = key_block; 454 key_block += key_len; 455 client_write_iv = key_block; 456 key_block += iv_len; 457 server_write_iv = key_block; 458 key_block += iv_len; 459 460 if (use_client_keys) { 461 mac_secret = client_write_mac_secret; 462 key = client_write_key; 463 iv = client_write_iv; 464 } else { 465 mac_secret = server_write_mac_secret; 466 key = server_write_key; 467 iv = server_write_iv; 468 } 469 470 if (key_block - S3I(s)->hs.key_block != S3I(s)->hs.key_block_len) { 471 SSLerror(s, ERR_R_INTERNAL_ERROR); 472 goto err; 473 } 474 475 if (is_read) { 476 if (!tls12_record_layer_change_read_cipher_state(s->internal->rl, 477 mac_secret, mac_secret_size, key, key_len, iv, iv_len)) 478 goto err; 479 } else { 480 if (!tls12_record_layer_change_write_cipher_state(s->internal->rl, 481 mac_secret, mac_secret_size, key, key_len, iv, iv_len)) 482 goto err; 483 } 484 485 if (aead != NULL) 486 return 1; 487 488 return tls1_change_cipher_state_cipher(s, is_read, 489 mac_secret, mac_secret_size, key, key_len, iv, iv_len); 490 491 err: 492 return (0); 493 } 494 495 int 496 tls1_setup_key_block(SSL *s) 497 { 498 unsigned char *key_block; 499 int mac_type = NID_undef, mac_secret_size = 0; 500 size_t key_block_len; 501 int key_len, iv_len; 502 const EVP_CIPHER *cipher = NULL; 503 const EVP_AEAD *aead = NULL; 504 const EVP_MD *mac = NULL; 505 int ret = 0; 506 507 if (S3I(s)->hs.key_block_len != 0) 508 return (1); 509 510 if (s->session->cipher && 511 (s->session->cipher->algorithm_mac & SSL_AEAD)) { 512 if (!ssl_cipher_get_evp_aead(s->session, &aead)) { 513 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 514 return (0); 515 } 516 key_len = EVP_AEAD_key_length(aead); 517 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(s->session->cipher); 518 } else { 519 if (!ssl_cipher_get_evp(s->session, &cipher, &mac, &mac_type, 520 &mac_secret_size)) { 521 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 522 return (0); 523 } 524 key_len = EVP_CIPHER_key_length(cipher); 525 iv_len = EVP_CIPHER_iv_length(cipher); 526 } 527 528 S3I(s)->tmp.new_aead = aead; 529 S3I(s)->tmp.new_sym_enc = cipher; 530 S3I(s)->tmp.new_hash = mac; 531 S3I(s)->tmp.new_mac_pkey_type = mac_type; 532 S3I(s)->tmp.new_mac_secret_size = mac_secret_size; 533 534 tls12_record_layer_set_aead(s->internal->rl, aead); 535 536 tls1_cleanup_key_block(s); 537 538 if ((key_block = reallocarray(NULL, mac_secret_size + key_len + iv_len, 539 2)) == NULL) { 540 SSLerror(s, ERR_R_MALLOC_FAILURE); 541 goto err; 542 } 543 key_block_len = (mac_secret_size + key_len + iv_len) * 2; 544 545 S3I(s)->hs.key_block_len = key_block_len; 546 S3I(s)->hs.key_block = key_block; 547 548 if (!tls1_generate_key_block(s, key_block, key_block_len)) 549 goto err; 550 551 if (!(s->internal->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) && 552 s->method->internal->version <= TLS1_VERSION) { 553 /* 554 * Enable vulnerability countermeasure for CBC ciphers with 555 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 556 */ 557 S3I(s)->need_empty_fragments = 1; 558 559 if (s->session->cipher != NULL) { 560 if (s->session->cipher->algorithm_enc == SSL_eNULL) 561 S3I(s)->need_empty_fragments = 0; 562 563 #ifndef OPENSSL_NO_RC4 564 if (s->session->cipher->algorithm_enc == SSL_RC4) 565 S3I(s)->need_empty_fragments = 0; 566 #endif 567 } 568 } 569 570 ret = 1; 571 572 err: 573 return (ret); 574 } 575 576 int 577 tls1_final_finish_mac(SSL *s, const char *str, int str_len, unsigned char *out) 578 { 579 unsigned char buf[EVP_MAX_MD_SIZE]; 580 size_t hash_len; 581 582 if (str_len < 0) 583 return 0; 584 585 if (!tls1_transcript_hash_value(s, buf, sizeof(buf), &hash_len)) 586 return 0; 587 588 if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length, 589 str, str_len, buf, hash_len, NULL, 0, NULL, 0, NULL, 0, 590 out, TLS1_FINISH_MAC_LENGTH)) 591 return 0; 592 593 return TLS1_FINISH_MAC_LENGTH; 594 } 595 596 int 597 tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 598 int len) 599 { 600 if (len < 0) 601 return 0; 602 603 if (!tls1_PRF(s, p, len, 604 TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, 605 s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0, 606 s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0, 607 s->session->master_key, SSL_MAX_MASTER_KEY_LENGTH)) 608 return 0; 609 610 return (SSL_MAX_MASTER_KEY_LENGTH); 611 } 612 613 int 614 tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, 615 const char *label, size_t llen, const unsigned char *context, 616 size_t contextlen, int use_context) 617 { 618 unsigned char *val = NULL; 619 size_t vallen, currentvalpos; 620 int rv; 621 622 if (!SSL_is_init_finished(s)) { 623 SSLerror(s, SSL_R_BAD_STATE); 624 return 0; 625 } 626 627 /* construct PRF arguments 628 * we construct the PRF argument ourself rather than passing separate 629 * values into the TLS PRF to ensure that the concatenation of values 630 * does not create a prohibited label. 631 */ 632 vallen = llen + SSL3_RANDOM_SIZE * 2; 633 if (use_context) { 634 vallen += 2 + contextlen; 635 } 636 637 val = malloc(vallen); 638 if (val == NULL) 639 goto err2; 640 currentvalpos = 0; 641 memcpy(val + currentvalpos, (unsigned char *) label, llen); 642 currentvalpos += llen; 643 memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE); 644 currentvalpos += SSL3_RANDOM_SIZE; 645 memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE); 646 currentvalpos += SSL3_RANDOM_SIZE; 647 648 if (use_context) { 649 val[currentvalpos] = (contextlen >> 8) & 0xff; 650 currentvalpos++; 651 val[currentvalpos] = contextlen & 0xff; 652 currentvalpos++; 653 if ((contextlen > 0) || (context != NULL)) { 654 memcpy(val + currentvalpos, context, contextlen); 655 } 656 } 657 658 /* disallow prohibited labels 659 * note that SSL3_RANDOM_SIZE > max(prohibited label len) = 660 * 15, so size of val > max(prohibited label len) = 15 and the 661 * comparisons won't have buffer overflow 662 */ 663 if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST, 664 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0) 665 goto err1; 666 if (memcmp(val, TLS_MD_SERVER_FINISH_CONST, 667 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0) 668 goto err1; 669 if (memcmp(val, TLS_MD_MASTER_SECRET_CONST, 670 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0) 671 goto err1; 672 if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST, 673 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) 674 goto err1; 675 676 rv = tls1_PRF(s, s->session->master_key, s->session->master_key_length, 677 val, vallen, NULL, 0, NULL, 0, NULL, 0, NULL, 0, out, olen); 678 679 goto ret; 680 err1: 681 SSLerror(s, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); 682 rv = 0; 683 goto ret; 684 err2: 685 SSLerror(s, ERR_R_MALLOC_FAILURE); 686 rv = 0; 687 ret: 688 free(val); 689 690 return (rv); 691 } 692 693 int 694 tls1_alert_code(int code) 695 { 696 switch (code) { 697 case SSL_AD_CLOSE_NOTIFY: 698 return (SSL3_AD_CLOSE_NOTIFY); 699 case SSL_AD_UNEXPECTED_MESSAGE: 700 return (SSL3_AD_UNEXPECTED_MESSAGE); 701 case SSL_AD_BAD_RECORD_MAC: 702 return (SSL3_AD_BAD_RECORD_MAC); 703 case SSL_AD_DECRYPTION_FAILED: 704 return (TLS1_AD_DECRYPTION_FAILED); 705 case SSL_AD_RECORD_OVERFLOW: 706 return (TLS1_AD_RECORD_OVERFLOW); 707 case SSL_AD_DECOMPRESSION_FAILURE: 708 return (SSL3_AD_DECOMPRESSION_FAILURE); 709 case SSL_AD_HANDSHAKE_FAILURE: 710 return (SSL3_AD_HANDSHAKE_FAILURE); 711 case SSL_AD_NO_CERTIFICATE: 712 return (-1); 713 case SSL_AD_BAD_CERTIFICATE: 714 return (SSL3_AD_BAD_CERTIFICATE); 715 case SSL_AD_UNSUPPORTED_CERTIFICATE: 716 return (SSL3_AD_UNSUPPORTED_CERTIFICATE); 717 case SSL_AD_CERTIFICATE_REVOKED: 718 return (SSL3_AD_CERTIFICATE_REVOKED); 719 case SSL_AD_CERTIFICATE_EXPIRED: 720 return (SSL3_AD_CERTIFICATE_EXPIRED); 721 case SSL_AD_CERTIFICATE_UNKNOWN: 722 return (SSL3_AD_CERTIFICATE_UNKNOWN); 723 case SSL_AD_ILLEGAL_PARAMETER: 724 return (SSL3_AD_ILLEGAL_PARAMETER); 725 case SSL_AD_UNKNOWN_CA: 726 return (TLS1_AD_UNKNOWN_CA); 727 case SSL_AD_ACCESS_DENIED: 728 return (TLS1_AD_ACCESS_DENIED); 729 case SSL_AD_DECODE_ERROR: 730 return (TLS1_AD_DECODE_ERROR); 731 case SSL_AD_DECRYPT_ERROR: 732 return (TLS1_AD_DECRYPT_ERROR); 733 case SSL_AD_EXPORT_RESTRICTION: 734 return (TLS1_AD_EXPORT_RESTRICTION); 735 case SSL_AD_PROTOCOL_VERSION: 736 return (TLS1_AD_PROTOCOL_VERSION); 737 case SSL_AD_INSUFFICIENT_SECURITY: 738 return (TLS1_AD_INSUFFICIENT_SECURITY); 739 case SSL_AD_INTERNAL_ERROR: 740 return (TLS1_AD_INTERNAL_ERROR); 741 case SSL_AD_INAPPROPRIATE_FALLBACK: 742 return(TLS1_AD_INAPPROPRIATE_FALLBACK); 743 case SSL_AD_USER_CANCELLED: 744 return (TLS1_AD_USER_CANCELLED); 745 case SSL_AD_NO_RENEGOTIATION: 746 return (TLS1_AD_NO_RENEGOTIATION); 747 case SSL_AD_UNSUPPORTED_EXTENSION: 748 return (TLS1_AD_UNSUPPORTED_EXTENSION); 749 case SSL_AD_CERTIFICATE_UNOBTAINABLE: 750 return (TLS1_AD_CERTIFICATE_UNOBTAINABLE); 751 case SSL_AD_UNRECOGNIZED_NAME: 752 return (TLS1_AD_UNRECOGNIZED_NAME); 753 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: 754 return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 755 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: 756 return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 757 case SSL_AD_UNKNOWN_PSK_IDENTITY: 758 return (TLS1_AD_UNKNOWN_PSK_IDENTITY); 759 default: 760 return (-1); 761 } 762 } 763