1 /* $OpenBSD: t1_enc.c,v 1.126 2020/10/14 16:57:33 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 * 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, unsigned char *km, int num) 304 { 305 if (num < 0) 306 return (0); 307 308 return tls1_PRF(s, 309 s->session->master_key, s->session->master_key_length, 310 TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, 311 s->s3->server_random, SSL3_RANDOM_SIZE, 312 s->s3->client_random, SSL3_RANDOM_SIZE, 313 NULL, 0, NULL, 0, km, num); 314 } 315 316 /* 317 * tls1_aead_ctx_init allocates aead_ctx, if needed. It returns 1 on success 318 * and 0 on failure. 319 */ 320 static int 321 tls1_aead_ctx_init(SSL_AEAD_CTX **aead_ctx) 322 { 323 if (*aead_ctx != NULL) { 324 EVP_AEAD_CTX_cleanup(&(*aead_ctx)->ctx); 325 return (1); 326 } 327 328 *aead_ctx = malloc(sizeof(SSL_AEAD_CTX)); 329 if (*aead_ctx == NULL) { 330 SSLerrorx(ERR_R_MALLOC_FAILURE); 331 return (0); 332 } 333 334 return (1); 335 } 336 337 static int 338 tls1_change_cipher_state_aead(SSL *s, char is_read, const unsigned char *key, 339 unsigned int key_len, const unsigned char *iv, unsigned int iv_len) 340 { 341 const EVP_AEAD *aead = S3I(s)->tmp.new_aead; 342 SSL_AEAD_CTX *aead_ctx; 343 344 /* XXX - Need to avoid clearing write state for DTLS. */ 345 if (SSL_is_dtls(s)) 346 return 0; 347 348 if (is_read) { 349 ssl_clear_cipher_read_state(s); 350 if (!tls1_aead_ctx_init(&s->internal->aead_read_ctx)) 351 return 0; 352 aead_ctx = s->internal->aead_read_ctx; 353 354 if (!tls12_record_layer_set_read_aead(s->internal->rl, aead_ctx)) 355 return 0; 356 } else { 357 ssl_clear_cipher_write_state(s); 358 if (!tls1_aead_ctx_init(&s->internal->aead_write_ctx)) 359 return 0; 360 aead_ctx = s->internal->aead_write_ctx; 361 362 if (!tls12_record_layer_set_write_aead(s->internal->rl, aead_ctx)) 363 return 0; 364 } 365 366 if (!EVP_AEAD_CTX_init(&aead_ctx->ctx, aead, key, key_len, 367 EVP_AEAD_DEFAULT_TAG_LENGTH, NULL)) 368 return (0); 369 if (iv_len > sizeof(aead_ctx->fixed_nonce)) { 370 SSLerrorx(ERR_R_INTERNAL_ERROR); 371 return (0); 372 } 373 memcpy(aead_ctx->fixed_nonce, iv, iv_len); 374 aead_ctx->fixed_nonce_len = iv_len; 375 aead_ctx->variable_nonce_len = 8; /* always the case, currently. */ 376 aead_ctx->variable_nonce_in_record = 377 (S3I(s)->hs.new_cipher->algorithm2 & 378 SSL_CIPHER_ALGORITHM2_VARIABLE_NONCE_IN_RECORD) != 0; 379 aead_ctx->xor_fixed_nonce = 380 S3I(s)->hs.new_cipher->algorithm_enc == SSL_CHACHA20POLY1305; 381 aead_ctx->tag_len = EVP_AEAD_max_overhead(aead); 382 383 if (aead_ctx->xor_fixed_nonce) { 384 if (aead_ctx->fixed_nonce_len != EVP_AEAD_nonce_length(aead) || 385 aead_ctx->variable_nonce_len > EVP_AEAD_nonce_length(aead)) { 386 SSLerrorx(ERR_R_INTERNAL_ERROR); 387 return (0); 388 } 389 } else { 390 if (aead_ctx->variable_nonce_len + aead_ctx->fixed_nonce_len != 391 EVP_AEAD_nonce_length(aead)) { 392 SSLerrorx(ERR_R_INTERNAL_ERROR); 393 return (0); 394 } 395 } 396 397 return (1); 398 } 399 400 /* 401 * tls1_change_cipher_state_cipher performs the work needed to switch cipher 402 * states when using EVP_CIPHER. The argument is_read is true iff this function 403 * is being called due to reading, as opposed to writing, a ChangeCipherSpec 404 * message. 405 */ 406 static int 407 tls1_change_cipher_state_cipher(SSL *s, char is_read, 408 const unsigned char *mac_secret, unsigned int mac_secret_size, 409 const unsigned char *key, unsigned int key_len, const unsigned char *iv, 410 unsigned int iv_len) 411 { 412 EVP_CIPHER_CTX *cipher_ctx; 413 const EVP_CIPHER *cipher; 414 EVP_MD_CTX *mac_ctx; 415 EVP_PKEY *mac_key; 416 const EVP_MD *mac; 417 int stream_mac; 418 int mac_type; 419 420 cipher = S3I(s)->tmp.new_sym_enc; 421 mac = S3I(s)->tmp.new_hash; 422 mac_type = S3I(s)->tmp.new_mac_pkey_type; 423 stream_mac = S3I(s)->hs.new_cipher->algorithm2 & TLS1_STREAM_MAC; 424 425 if (is_read) { 426 ssl_clear_cipher_read_state(s); 427 428 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 429 goto err; 430 s->enc_read_ctx = cipher_ctx; 431 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 432 goto err; 433 s->read_hash = mac_ctx; 434 435 if (!tls12_record_layer_set_read_cipher_hash(s->internal->rl, 436 cipher_ctx, mac_ctx, stream_mac)) 437 goto err; 438 439 if (!tls12_record_layer_set_read_mac_key(s->internal->rl, 440 S3I(s)->read_mac_secret, mac_secret_size)) 441 goto err; 442 } else { 443 /* 444 * DTLS fragments retain a pointer to the compression, cipher 445 * and hash contexts, so that it can restore state in order 446 * to perform retransmissions. As such, we cannot free write 447 * contexts that are used for DTLS - these are instead freed 448 * by DTLS when its frees a ChangeCipherSpec fragment. 449 */ 450 if (!SSL_is_dtls(s)) 451 ssl_clear_cipher_write_state(s); 452 453 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 454 goto err; 455 s->internal->enc_write_ctx = cipher_ctx; 456 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 457 goto err; 458 s->internal->write_hash = mac_ctx; 459 460 if (!tls12_record_layer_set_write_cipher_hash(s->internal->rl, 461 cipher_ctx, mac_ctx, stream_mac)) 462 goto err; 463 } 464 465 EVP_CipherInit_ex(cipher_ctx, cipher, NULL, key, iv, !is_read); 466 467 if ((mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret, 468 mac_secret_size)) == NULL) 469 goto err; 470 EVP_DigestSignInit(mac_ctx, NULL, mac, NULL, mac_key); 471 EVP_PKEY_free(mac_key); 472 473 if (S3I(s)->hs.new_cipher->algorithm_enc == SSL_eGOST2814789CNT) { 474 int nid; 475 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 476 nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet; 477 else 478 nid = NID_id_tc26_gost_28147_param_Z; 479 480 EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_GOST_SET_SBOX, nid, 0); 481 if (S3I(s)->hs.new_cipher->algorithm_mac == SSL_GOST89MAC) 482 EVP_MD_CTX_ctrl(mac_ctx, EVP_MD_CTRL_GOST_SET_SBOX, nid, 0); 483 } 484 485 return (1); 486 487 err: 488 SSLerrorx(ERR_R_MALLOC_FAILURE); 489 return (0); 490 } 491 492 int 493 tls1_change_cipher_state(SSL *s, int which) 494 { 495 const unsigned char *client_write_mac_secret, *server_write_mac_secret; 496 const unsigned char *client_write_key, *server_write_key; 497 const unsigned char *client_write_iv, *server_write_iv; 498 const unsigned char *mac_secret, *key, *iv; 499 int mac_secret_size, key_len, iv_len; 500 unsigned char *key_block, *seq; 501 const EVP_CIPHER *cipher; 502 const EVP_AEAD *aead; 503 char is_read, use_client_keys; 504 505 cipher = S3I(s)->tmp.new_sym_enc; 506 aead = S3I(s)->tmp.new_aead; 507 508 /* 509 * is_read is true if we have just read a ChangeCipherSpec message, 510 * that is we need to update the read cipherspec. Otherwise we have 511 * just written one. 512 */ 513 is_read = (which & SSL3_CC_READ) != 0; 514 515 /* 516 * use_client_keys is true if we wish to use the keys for the "client 517 * write" direction. This is the case if we're a client sending a 518 * ChangeCipherSpec, or a server reading a client's ChangeCipherSpec. 519 */ 520 use_client_keys = ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 521 (which == SSL3_CHANGE_CIPHER_SERVER_READ)); 522 523 /* 524 * Reset sequence number to zero - for DTLS this is handled in 525 * dtls1_reset_seq_numbers(). 526 */ 527 if (!SSL_is_dtls(s)) { 528 seq = is_read ? S3I(s)->read_sequence : S3I(s)->write_sequence; 529 memset(seq, 0, SSL3_SEQUENCE_SIZE); 530 } 531 532 if (aead != NULL) { 533 key_len = EVP_AEAD_key_length(aead); 534 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(S3I(s)->hs.new_cipher); 535 } else { 536 key_len = EVP_CIPHER_key_length(cipher); 537 iv_len = EVP_CIPHER_iv_length(cipher); 538 } 539 540 mac_secret_size = S3I(s)->tmp.new_mac_secret_size; 541 542 key_block = S3I(s)->hs.key_block; 543 client_write_mac_secret = key_block; 544 key_block += mac_secret_size; 545 server_write_mac_secret = key_block; 546 key_block += mac_secret_size; 547 client_write_key = key_block; 548 key_block += key_len; 549 server_write_key = key_block; 550 key_block += key_len; 551 client_write_iv = key_block; 552 key_block += iv_len; 553 server_write_iv = key_block; 554 key_block += iv_len; 555 556 if (use_client_keys) { 557 mac_secret = client_write_mac_secret; 558 key = client_write_key; 559 iv = client_write_iv; 560 } else { 561 mac_secret = server_write_mac_secret; 562 key = server_write_key; 563 iv = server_write_iv; 564 } 565 566 if (key_block - S3I(s)->hs.key_block != S3I(s)->hs.key_block_len) { 567 SSLerror(s, ERR_R_INTERNAL_ERROR); 568 goto err2; 569 } 570 571 if (is_read) { 572 memcpy(S3I(s)->read_mac_secret, mac_secret, mac_secret_size); 573 S3I(s)->read_mac_secret_size = mac_secret_size; 574 } 575 576 if (aead != NULL) { 577 return tls1_change_cipher_state_aead(s, is_read, key, key_len, 578 iv, iv_len); 579 } 580 581 return tls1_change_cipher_state_cipher(s, is_read, 582 mac_secret, mac_secret_size, key, key_len, iv, iv_len); 583 584 err2: 585 return (0); 586 } 587 588 int 589 tls1_setup_key_block(SSL *s) 590 { 591 unsigned char *key_block; 592 int mac_type = NID_undef, mac_secret_size = 0; 593 int key_block_len, key_len, iv_len; 594 const EVP_CIPHER *cipher = NULL; 595 const EVP_AEAD *aead = NULL; 596 const EVP_MD *mac = NULL; 597 int ret = 0; 598 599 if (S3I(s)->hs.key_block_len != 0) 600 return (1); 601 602 if (s->session->cipher && 603 (s->session->cipher->algorithm_mac & SSL_AEAD)) { 604 if (!ssl_cipher_get_evp_aead(s->session, &aead)) { 605 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 606 return (0); 607 } 608 key_len = EVP_AEAD_key_length(aead); 609 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(s->session->cipher); 610 } else { 611 if (!ssl_cipher_get_evp(s->session, &cipher, &mac, &mac_type, 612 &mac_secret_size)) { 613 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 614 return (0); 615 } 616 key_len = EVP_CIPHER_key_length(cipher); 617 iv_len = EVP_CIPHER_iv_length(cipher); 618 } 619 620 S3I(s)->tmp.new_aead = aead; 621 S3I(s)->tmp.new_sym_enc = cipher; 622 S3I(s)->tmp.new_hash = mac; 623 S3I(s)->tmp.new_mac_pkey_type = mac_type; 624 S3I(s)->tmp.new_mac_secret_size = mac_secret_size; 625 626 tls1_cleanup_key_block(s); 627 628 if ((key_block = reallocarray(NULL, mac_secret_size + key_len + iv_len, 629 2)) == NULL) { 630 SSLerror(s, ERR_R_MALLOC_FAILURE); 631 goto err; 632 } 633 key_block_len = (mac_secret_size + key_len + iv_len) * 2; 634 635 S3I(s)->hs.key_block_len = key_block_len; 636 S3I(s)->hs.key_block = key_block; 637 638 if (!tls1_generate_key_block(s, key_block, key_block_len)) 639 goto err; 640 641 if (!(s->internal->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) && 642 s->method->internal->version <= TLS1_VERSION) { 643 /* 644 * Enable vulnerability countermeasure for CBC ciphers with 645 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 646 */ 647 S3I(s)->need_empty_fragments = 1; 648 649 if (s->session->cipher != NULL) { 650 if (s->session->cipher->algorithm_enc == SSL_eNULL) 651 S3I(s)->need_empty_fragments = 0; 652 653 #ifndef OPENSSL_NO_RC4 654 if (s->session->cipher->algorithm_enc == SSL_RC4) 655 S3I(s)->need_empty_fragments = 0; 656 #endif 657 } 658 } 659 660 ret = 1; 661 662 err: 663 return (ret); 664 } 665 666 int 667 tls1_final_finish_mac(SSL *s, const char *str, int str_len, unsigned char *out) 668 { 669 unsigned char buf[EVP_MAX_MD_SIZE]; 670 size_t hash_len; 671 672 if (str_len < 0) 673 return 0; 674 675 if (!tls1_transcript_hash_value(s, buf, sizeof(buf), &hash_len)) 676 return 0; 677 678 if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length, 679 str, str_len, buf, hash_len, NULL, 0, NULL, 0, NULL, 0, 680 out, TLS1_FINISH_MAC_LENGTH)) 681 return 0; 682 683 return TLS1_FINISH_MAC_LENGTH; 684 } 685 686 int 687 tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 688 int len) 689 { 690 if (len < 0) 691 return 0; 692 693 if (!tls1_PRF(s, p, len, 694 TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, 695 s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0, 696 s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0, 697 s->session->master_key, SSL_MAX_MASTER_KEY_LENGTH)) 698 return 0; 699 700 return (SSL_MAX_MASTER_KEY_LENGTH); 701 } 702 703 int 704 tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, 705 const char *label, size_t llen, const unsigned char *context, 706 size_t contextlen, int use_context) 707 { 708 unsigned char *val = NULL; 709 size_t vallen, currentvalpos; 710 int rv; 711 712 /* construct PRF arguments 713 * we construct the PRF argument ourself rather than passing separate 714 * values into the TLS PRF to ensure that the concatenation of values 715 * does not create a prohibited label. 716 */ 717 vallen = llen + SSL3_RANDOM_SIZE * 2; 718 if (use_context) { 719 vallen += 2 + contextlen; 720 } 721 722 val = malloc(vallen); 723 if (val == NULL) 724 goto err2; 725 currentvalpos = 0; 726 memcpy(val + currentvalpos, (unsigned char *) label, llen); 727 currentvalpos += llen; 728 memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE); 729 currentvalpos += SSL3_RANDOM_SIZE; 730 memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE); 731 currentvalpos += SSL3_RANDOM_SIZE; 732 733 if (use_context) { 734 val[currentvalpos] = (contextlen >> 8) & 0xff; 735 currentvalpos++; 736 val[currentvalpos] = contextlen & 0xff; 737 currentvalpos++; 738 if ((contextlen > 0) || (context != NULL)) { 739 memcpy(val + currentvalpos, context, contextlen); 740 } 741 } 742 743 /* disallow prohibited labels 744 * note that SSL3_RANDOM_SIZE > max(prohibited label len) = 745 * 15, so size of val > max(prohibited label len) = 15 and the 746 * comparisons won't have buffer overflow 747 */ 748 if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST, 749 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0) 750 goto err1; 751 if (memcmp(val, TLS_MD_SERVER_FINISH_CONST, 752 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0) 753 goto err1; 754 if (memcmp(val, TLS_MD_MASTER_SECRET_CONST, 755 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0) 756 goto err1; 757 if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST, 758 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) 759 goto err1; 760 761 rv = tls1_PRF(s, s->session->master_key, s->session->master_key_length, 762 val, vallen, NULL, 0, NULL, 0, NULL, 0, NULL, 0, out, olen); 763 764 goto ret; 765 err1: 766 SSLerror(s, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); 767 rv = 0; 768 goto ret; 769 err2: 770 SSLerror(s, ERR_R_MALLOC_FAILURE); 771 rv = 0; 772 ret: 773 free(val); 774 775 return (rv); 776 } 777 778 int 779 tls1_alert_code(int code) 780 { 781 switch (code) { 782 case SSL_AD_CLOSE_NOTIFY: 783 return (SSL3_AD_CLOSE_NOTIFY); 784 case SSL_AD_UNEXPECTED_MESSAGE: 785 return (SSL3_AD_UNEXPECTED_MESSAGE); 786 case SSL_AD_BAD_RECORD_MAC: 787 return (SSL3_AD_BAD_RECORD_MAC); 788 case SSL_AD_DECRYPTION_FAILED: 789 return (TLS1_AD_DECRYPTION_FAILED); 790 case SSL_AD_RECORD_OVERFLOW: 791 return (TLS1_AD_RECORD_OVERFLOW); 792 case SSL_AD_DECOMPRESSION_FAILURE: 793 return (SSL3_AD_DECOMPRESSION_FAILURE); 794 case SSL_AD_HANDSHAKE_FAILURE: 795 return (SSL3_AD_HANDSHAKE_FAILURE); 796 case SSL_AD_NO_CERTIFICATE: 797 return (-1); 798 case SSL_AD_BAD_CERTIFICATE: 799 return (SSL3_AD_BAD_CERTIFICATE); 800 case SSL_AD_UNSUPPORTED_CERTIFICATE: 801 return (SSL3_AD_UNSUPPORTED_CERTIFICATE); 802 case SSL_AD_CERTIFICATE_REVOKED: 803 return (SSL3_AD_CERTIFICATE_REVOKED); 804 case SSL_AD_CERTIFICATE_EXPIRED: 805 return (SSL3_AD_CERTIFICATE_EXPIRED); 806 case SSL_AD_CERTIFICATE_UNKNOWN: 807 return (SSL3_AD_CERTIFICATE_UNKNOWN); 808 case SSL_AD_ILLEGAL_PARAMETER: 809 return (SSL3_AD_ILLEGAL_PARAMETER); 810 case SSL_AD_UNKNOWN_CA: 811 return (TLS1_AD_UNKNOWN_CA); 812 case SSL_AD_ACCESS_DENIED: 813 return (TLS1_AD_ACCESS_DENIED); 814 case SSL_AD_DECODE_ERROR: 815 return (TLS1_AD_DECODE_ERROR); 816 case SSL_AD_DECRYPT_ERROR: 817 return (TLS1_AD_DECRYPT_ERROR); 818 case SSL_AD_EXPORT_RESTRICTION: 819 return (TLS1_AD_EXPORT_RESTRICTION); 820 case SSL_AD_PROTOCOL_VERSION: 821 return (TLS1_AD_PROTOCOL_VERSION); 822 case SSL_AD_INSUFFICIENT_SECURITY: 823 return (TLS1_AD_INSUFFICIENT_SECURITY); 824 case SSL_AD_INTERNAL_ERROR: 825 return (TLS1_AD_INTERNAL_ERROR); 826 case SSL_AD_INAPPROPRIATE_FALLBACK: 827 return(TLS1_AD_INAPPROPRIATE_FALLBACK); 828 case SSL_AD_USER_CANCELLED: 829 return (TLS1_AD_USER_CANCELLED); 830 case SSL_AD_NO_RENEGOTIATION: 831 return (TLS1_AD_NO_RENEGOTIATION); 832 case SSL_AD_UNSUPPORTED_EXTENSION: 833 return (TLS1_AD_UNSUPPORTED_EXTENSION); 834 case SSL_AD_CERTIFICATE_UNOBTAINABLE: 835 return (TLS1_AD_CERTIFICATE_UNOBTAINABLE); 836 case SSL_AD_UNRECOGNIZED_NAME: 837 return (TLS1_AD_UNRECOGNIZED_NAME); 838 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: 839 return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 840 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: 841 return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 842 case SSL_AD_UNKNOWN_PSK_IDENTITY: 843 return (TLS1_AD_UNKNOWN_PSK_IDENTITY); 844 default: 845 return (-1); 846 } 847 } 848