1 /* $OpenBSD: t1_enc.c,v 1.128 2021/01/07 15:32:59 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, 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_aead_ctx_init allocates aead_ctx, if needed. It returns 1 on success 315 * and 0 on failure. 316 */ 317 static int 318 tls1_aead_ctx_init(SSL_AEAD_CTX **aead_ctx) 319 { 320 if (*aead_ctx != NULL) { 321 EVP_AEAD_CTX_cleanup(&(*aead_ctx)->ctx); 322 return (1); 323 } 324 325 *aead_ctx = malloc(sizeof(SSL_AEAD_CTX)); 326 if (*aead_ctx == NULL) { 327 SSLerrorx(ERR_R_MALLOC_FAILURE); 328 return (0); 329 } 330 331 return (1); 332 } 333 334 static int 335 tls1_change_cipher_state_aead(SSL *s, char is_read, const unsigned char *key, 336 unsigned int key_len, const unsigned char *iv, unsigned int iv_len) 337 { 338 const EVP_AEAD *aead = S3I(s)->tmp.new_aead; 339 SSL_AEAD_CTX *aead_ctx; 340 341 /* XXX - Need to avoid clearing write state for DTLS. */ 342 if (SSL_is_dtls(s)) 343 return 0; 344 345 if (is_read) { 346 ssl_clear_cipher_read_state(s); 347 if (!tls1_aead_ctx_init(&s->internal->aead_read_ctx)) 348 return 0; 349 aead_ctx = s->internal->aead_read_ctx; 350 351 if (!tls12_record_layer_set_read_aead(s->internal->rl, aead_ctx)) 352 return 0; 353 } else { 354 ssl_clear_cipher_write_state(s); 355 if (!tls1_aead_ctx_init(&s->internal->aead_write_ctx)) 356 return 0; 357 aead_ctx = s->internal->aead_write_ctx; 358 359 if (!tls12_record_layer_set_write_aead(s->internal->rl, aead_ctx)) 360 return 0; 361 } 362 363 if (!EVP_AEAD_CTX_init(&aead_ctx->ctx, aead, key, key_len, 364 EVP_AEAD_DEFAULT_TAG_LENGTH, NULL)) 365 return (0); 366 if (iv_len > sizeof(aead_ctx->fixed_nonce)) { 367 SSLerrorx(ERR_R_INTERNAL_ERROR); 368 return (0); 369 } 370 memcpy(aead_ctx->fixed_nonce, iv, iv_len); 371 aead_ctx->fixed_nonce_len = iv_len; 372 aead_ctx->variable_nonce_len = 8; /* always the case, currently. */ 373 aead_ctx->variable_nonce_in_record = 374 (S3I(s)->hs.new_cipher->algorithm2 & 375 SSL_CIPHER_ALGORITHM2_VARIABLE_NONCE_IN_RECORD) != 0; 376 aead_ctx->xor_fixed_nonce = 377 S3I(s)->hs.new_cipher->algorithm_enc == SSL_CHACHA20POLY1305; 378 aead_ctx->tag_len = EVP_AEAD_max_overhead(aead); 379 380 if (aead_ctx->xor_fixed_nonce) { 381 if (aead_ctx->fixed_nonce_len != EVP_AEAD_nonce_length(aead) || 382 aead_ctx->variable_nonce_len > EVP_AEAD_nonce_length(aead)) { 383 SSLerrorx(ERR_R_INTERNAL_ERROR); 384 return (0); 385 } 386 } else { 387 if (aead_ctx->variable_nonce_len + aead_ctx->fixed_nonce_len != 388 EVP_AEAD_nonce_length(aead)) { 389 SSLerrorx(ERR_R_INTERNAL_ERROR); 390 return (0); 391 } 392 } 393 394 return (1); 395 } 396 397 /* 398 * tls1_change_cipher_state_cipher performs the work needed to switch cipher 399 * states when using EVP_CIPHER. The argument is_read is true iff this function 400 * is being called due to reading, as opposed to writing, a ChangeCipherSpec 401 * message. 402 */ 403 static int 404 tls1_change_cipher_state_cipher(SSL *s, char is_read, 405 const unsigned char *mac_secret, unsigned int mac_secret_size, 406 const unsigned char *key, unsigned int key_len, const unsigned char *iv, 407 unsigned int iv_len) 408 { 409 EVP_CIPHER_CTX *cipher_ctx; 410 const EVP_CIPHER *cipher; 411 EVP_MD_CTX *mac_ctx; 412 EVP_PKEY *mac_key; 413 const EVP_MD *mac; 414 int stream_mac; 415 int mac_type; 416 417 cipher = S3I(s)->tmp.new_sym_enc; 418 mac = S3I(s)->tmp.new_hash; 419 mac_type = S3I(s)->tmp.new_mac_pkey_type; 420 stream_mac = S3I(s)->hs.new_cipher->algorithm2 & TLS1_STREAM_MAC; 421 422 if (is_read) { 423 ssl_clear_cipher_read_state(s); 424 425 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 426 goto err; 427 s->enc_read_ctx = cipher_ctx; 428 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 429 goto err; 430 s->read_hash = mac_ctx; 431 432 if (!tls12_record_layer_set_read_cipher_hash(s->internal->rl, 433 cipher_ctx, mac_ctx, stream_mac)) 434 goto err; 435 436 if (!tls12_record_layer_set_read_mac_key(s->internal->rl, 437 mac_secret, mac_secret_size)) 438 goto err; 439 } else { 440 /* 441 * DTLS fragments retain a pointer to the compression, cipher 442 * and hash contexts, so that it can restore state in order 443 * to perform retransmissions. As such, we cannot free write 444 * contexts that are used for DTLS - these are instead freed 445 * by DTLS when its frees a ChangeCipherSpec fragment. 446 */ 447 if (!SSL_is_dtls(s)) 448 ssl_clear_cipher_write_state(s); 449 450 if ((cipher_ctx = EVP_CIPHER_CTX_new()) == NULL) 451 goto err; 452 s->internal->enc_write_ctx = cipher_ctx; 453 if ((mac_ctx = EVP_MD_CTX_new()) == NULL) 454 goto err; 455 s->internal->write_hash = mac_ctx; 456 457 if (!tls12_record_layer_set_write_cipher_hash(s->internal->rl, 458 cipher_ctx, mac_ctx, stream_mac)) 459 goto err; 460 } 461 462 EVP_CipherInit_ex(cipher_ctx, cipher, NULL, key, iv, !is_read); 463 464 if ((mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret, 465 mac_secret_size)) == NULL) 466 goto err; 467 EVP_DigestSignInit(mac_ctx, NULL, mac, NULL, mac_key); 468 EVP_PKEY_free(mac_key); 469 470 if (S3I(s)->hs.new_cipher->algorithm_enc == SSL_eGOST2814789CNT) { 471 int nid; 472 if (S3I(s)->hs.new_cipher->algorithm2 & SSL_HANDSHAKE_MAC_GOST94) 473 nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet; 474 else 475 nid = NID_id_tc26_gost_28147_param_Z; 476 477 EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_GOST_SET_SBOX, nid, 0); 478 if (S3I(s)->hs.new_cipher->algorithm_mac == SSL_GOST89MAC) 479 EVP_MD_CTX_ctrl(mac_ctx, EVP_MD_CTRL_GOST_SET_SBOX, nid, 0); 480 } 481 482 return (1); 483 484 err: 485 SSLerrorx(ERR_R_MALLOC_FAILURE); 486 return (0); 487 } 488 489 int 490 tls1_change_cipher_state(SSL *s, int which) 491 { 492 const unsigned char *client_write_mac_secret, *server_write_mac_secret; 493 const unsigned char *client_write_key, *server_write_key; 494 const unsigned char *client_write_iv, *server_write_iv; 495 const unsigned char *mac_secret, *key, *iv; 496 int mac_secret_size, key_len, iv_len; 497 unsigned char *key_block, *seq; 498 const EVP_CIPHER *cipher; 499 const EVP_AEAD *aead; 500 char is_read, use_client_keys; 501 502 cipher = S3I(s)->tmp.new_sym_enc; 503 aead = S3I(s)->tmp.new_aead; 504 505 /* 506 * is_read is true if we have just read a ChangeCipherSpec message, 507 * that is we need to update the read cipherspec. Otherwise we have 508 * just written one. 509 */ 510 is_read = (which & SSL3_CC_READ) != 0; 511 512 /* 513 * use_client_keys is true if we wish to use the keys for the "client 514 * write" direction. This is the case if we're a client sending a 515 * ChangeCipherSpec, or a server reading a client's ChangeCipherSpec. 516 */ 517 use_client_keys = ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 518 (which == SSL3_CHANGE_CIPHER_SERVER_READ)); 519 520 /* 521 * Reset sequence number to zero - for DTLS this is handled in 522 * dtls1_reset_seq_numbers(). 523 */ 524 if (!SSL_is_dtls(s)) { 525 seq = is_read ? S3I(s)->read_sequence : S3I(s)->write_sequence; 526 memset(seq, 0, SSL3_SEQUENCE_SIZE); 527 } 528 529 if (aead != NULL) { 530 key_len = EVP_AEAD_key_length(aead); 531 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(S3I(s)->hs.new_cipher); 532 } else { 533 key_len = EVP_CIPHER_key_length(cipher); 534 iv_len = EVP_CIPHER_iv_length(cipher); 535 } 536 537 mac_secret_size = S3I(s)->tmp.new_mac_secret_size; 538 539 key_block = S3I(s)->hs.key_block; 540 client_write_mac_secret = key_block; 541 key_block += mac_secret_size; 542 server_write_mac_secret = key_block; 543 key_block += mac_secret_size; 544 client_write_key = key_block; 545 key_block += key_len; 546 server_write_key = key_block; 547 key_block += key_len; 548 client_write_iv = key_block; 549 key_block += iv_len; 550 server_write_iv = key_block; 551 key_block += iv_len; 552 553 if (use_client_keys) { 554 mac_secret = client_write_mac_secret; 555 key = client_write_key; 556 iv = client_write_iv; 557 } else { 558 mac_secret = server_write_mac_secret; 559 key = server_write_key; 560 iv = server_write_iv; 561 } 562 563 if (key_block - S3I(s)->hs.key_block != S3I(s)->hs.key_block_len) { 564 SSLerror(s, ERR_R_INTERNAL_ERROR); 565 goto err2; 566 } 567 568 if (aead != NULL) { 569 return tls1_change_cipher_state_aead(s, is_read, key, key_len, 570 iv, iv_len); 571 } 572 573 return tls1_change_cipher_state_cipher(s, is_read, 574 mac_secret, mac_secret_size, key, key_len, iv, iv_len); 575 576 err2: 577 return (0); 578 } 579 580 int 581 tls1_setup_key_block(SSL *s) 582 { 583 unsigned char *key_block; 584 int mac_type = NID_undef, mac_secret_size = 0; 585 size_t key_block_len; 586 int key_len, iv_len; 587 const EVP_CIPHER *cipher = NULL; 588 const EVP_AEAD *aead = NULL; 589 const EVP_MD *mac = NULL; 590 int ret = 0; 591 592 if (S3I(s)->hs.key_block_len != 0) 593 return (1); 594 595 if (s->session->cipher && 596 (s->session->cipher->algorithm_mac & SSL_AEAD)) { 597 if (!ssl_cipher_get_evp_aead(s->session, &aead)) { 598 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 599 return (0); 600 } 601 key_len = EVP_AEAD_key_length(aead); 602 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(s->session->cipher); 603 } else { 604 if (!ssl_cipher_get_evp(s->session, &cipher, &mac, &mac_type, 605 &mac_secret_size)) { 606 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 607 return (0); 608 } 609 key_len = EVP_CIPHER_key_length(cipher); 610 iv_len = EVP_CIPHER_iv_length(cipher); 611 } 612 613 S3I(s)->tmp.new_aead = aead; 614 S3I(s)->tmp.new_sym_enc = cipher; 615 S3I(s)->tmp.new_hash = mac; 616 S3I(s)->tmp.new_mac_pkey_type = mac_type; 617 S3I(s)->tmp.new_mac_secret_size = mac_secret_size; 618 619 tls1_cleanup_key_block(s); 620 621 if ((key_block = reallocarray(NULL, mac_secret_size + key_len + iv_len, 622 2)) == NULL) { 623 SSLerror(s, ERR_R_MALLOC_FAILURE); 624 goto err; 625 } 626 key_block_len = (mac_secret_size + key_len + iv_len) * 2; 627 628 S3I(s)->hs.key_block_len = key_block_len; 629 S3I(s)->hs.key_block = key_block; 630 631 if (!tls1_generate_key_block(s, key_block, key_block_len)) 632 goto err; 633 634 if (!(s->internal->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) && 635 s->method->internal->version <= TLS1_VERSION) { 636 /* 637 * Enable vulnerability countermeasure for CBC ciphers with 638 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 639 */ 640 S3I(s)->need_empty_fragments = 1; 641 642 if (s->session->cipher != NULL) { 643 if (s->session->cipher->algorithm_enc == SSL_eNULL) 644 S3I(s)->need_empty_fragments = 0; 645 646 #ifndef OPENSSL_NO_RC4 647 if (s->session->cipher->algorithm_enc == SSL_RC4) 648 S3I(s)->need_empty_fragments = 0; 649 #endif 650 } 651 } 652 653 ret = 1; 654 655 err: 656 return (ret); 657 } 658 659 int 660 tls1_final_finish_mac(SSL *s, const char *str, int str_len, unsigned char *out) 661 { 662 unsigned char buf[EVP_MAX_MD_SIZE]; 663 size_t hash_len; 664 665 if (str_len < 0) 666 return 0; 667 668 if (!tls1_transcript_hash_value(s, buf, sizeof(buf), &hash_len)) 669 return 0; 670 671 if (!tls1_PRF(s, s->session->master_key, s->session->master_key_length, 672 str, str_len, buf, hash_len, NULL, 0, NULL, 0, NULL, 0, 673 out, TLS1_FINISH_MAC_LENGTH)) 674 return 0; 675 676 return TLS1_FINISH_MAC_LENGTH; 677 } 678 679 int 680 tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 681 int len) 682 { 683 if (len < 0) 684 return 0; 685 686 if (!tls1_PRF(s, p, len, 687 TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE, 688 s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0, 689 s->s3->server_random, SSL3_RANDOM_SIZE, NULL, 0, 690 s->session->master_key, SSL_MAX_MASTER_KEY_LENGTH)) 691 return 0; 692 693 return (SSL_MAX_MASTER_KEY_LENGTH); 694 } 695 696 int 697 tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, 698 const char *label, size_t llen, const unsigned char *context, 699 size_t contextlen, int use_context) 700 { 701 unsigned char *val = NULL; 702 size_t vallen, currentvalpos; 703 int rv; 704 705 /* construct PRF arguments 706 * we construct the PRF argument ourself rather than passing separate 707 * values into the TLS PRF to ensure that the concatenation of values 708 * does not create a prohibited label. 709 */ 710 vallen = llen + SSL3_RANDOM_SIZE * 2; 711 if (use_context) { 712 vallen += 2 + contextlen; 713 } 714 715 val = malloc(vallen); 716 if (val == NULL) 717 goto err2; 718 currentvalpos = 0; 719 memcpy(val + currentvalpos, (unsigned char *) label, llen); 720 currentvalpos += llen; 721 memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE); 722 currentvalpos += SSL3_RANDOM_SIZE; 723 memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE); 724 currentvalpos += SSL3_RANDOM_SIZE; 725 726 if (use_context) { 727 val[currentvalpos] = (contextlen >> 8) & 0xff; 728 currentvalpos++; 729 val[currentvalpos] = contextlen & 0xff; 730 currentvalpos++; 731 if ((contextlen > 0) || (context != NULL)) { 732 memcpy(val + currentvalpos, context, contextlen); 733 } 734 } 735 736 /* disallow prohibited labels 737 * note that SSL3_RANDOM_SIZE > max(prohibited label len) = 738 * 15, so size of val > max(prohibited label len) = 15 and the 739 * comparisons won't have buffer overflow 740 */ 741 if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST, 742 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0) 743 goto err1; 744 if (memcmp(val, TLS_MD_SERVER_FINISH_CONST, 745 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0) 746 goto err1; 747 if (memcmp(val, TLS_MD_MASTER_SECRET_CONST, 748 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0) 749 goto err1; 750 if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST, 751 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) 752 goto err1; 753 754 rv = tls1_PRF(s, s->session->master_key, s->session->master_key_length, 755 val, vallen, NULL, 0, NULL, 0, NULL, 0, NULL, 0, out, olen); 756 757 goto ret; 758 err1: 759 SSLerror(s, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); 760 rv = 0; 761 goto ret; 762 err2: 763 SSLerror(s, ERR_R_MALLOC_FAILURE); 764 rv = 0; 765 ret: 766 free(val); 767 768 return (rv); 769 } 770 771 int 772 tls1_alert_code(int code) 773 { 774 switch (code) { 775 case SSL_AD_CLOSE_NOTIFY: 776 return (SSL3_AD_CLOSE_NOTIFY); 777 case SSL_AD_UNEXPECTED_MESSAGE: 778 return (SSL3_AD_UNEXPECTED_MESSAGE); 779 case SSL_AD_BAD_RECORD_MAC: 780 return (SSL3_AD_BAD_RECORD_MAC); 781 case SSL_AD_DECRYPTION_FAILED: 782 return (TLS1_AD_DECRYPTION_FAILED); 783 case SSL_AD_RECORD_OVERFLOW: 784 return (TLS1_AD_RECORD_OVERFLOW); 785 case SSL_AD_DECOMPRESSION_FAILURE: 786 return (SSL3_AD_DECOMPRESSION_FAILURE); 787 case SSL_AD_HANDSHAKE_FAILURE: 788 return (SSL3_AD_HANDSHAKE_FAILURE); 789 case SSL_AD_NO_CERTIFICATE: 790 return (-1); 791 case SSL_AD_BAD_CERTIFICATE: 792 return (SSL3_AD_BAD_CERTIFICATE); 793 case SSL_AD_UNSUPPORTED_CERTIFICATE: 794 return (SSL3_AD_UNSUPPORTED_CERTIFICATE); 795 case SSL_AD_CERTIFICATE_REVOKED: 796 return (SSL3_AD_CERTIFICATE_REVOKED); 797 case SSL_AD_CERTIFICATE_EXPIRED: 798 return (SSL3_AD_CERTIFICATE_EXPIRED); 799 case SSL_AD_CERTIFICATE_UNKNOWN: 800 return (SSL3_AD_CERTIFICATE_UNKNOWN); 801 case SSL_AD_ILLEGAL_PARAMETER: 802 return (SSL3_AD_ILLEGAL_PARAMETER); 803 case SSL_AD_UNKNOWN_CA: 804 return (TLS1_AD_UNKNOWN_CA); 805 case SSL_AD_ACCESS_DENIED: 806 return (TLS1_AD_ACCESS_DENIED); 807 case SSL_AD_DECODE_ERROR: 808 return (TLS1_AD_DECODE_ERROR); 809 case SSL_AD_DECRYPT_ERROR: 810 return (TLS1_AD_DECRYPT_ERROR); 811 case SSL_AD_EXPORT_RESTRICTION: 812 return (TLS1_AD_EXPORT_RESTRICTION); 813 case SSL_AD_PROTOCOL_VERSION: 814 return (TLS1_AD_PROTOCOL_VERSION); 815 case SSL_AD_INSUFFICIENT_SECURITY: 816 return (TLS1_AD_INSUFFICIENT_SECURITY); 817 case SSL_AD_INTERNAL_ERROR: 818 return (TLS1_AD_INTERNAL_ERROR); 819 case SSL_AD_INAPPROPRIATE_FALLBACK: 820 return(TLS1_AD_INAPPROPRIATE_FALLBACK); 821 case SSL_AD_USER_CANCELLED: 822 return (TLS1_AD_USER_CANCELLED); 823 case SSL_AD_NO_RENEGOTIATION: 824 return (TLS1_AD_NO_RENEGOTIATION); 825 case SSL_AD_UNSUPPORTED_EXTENSION: 826 return (TLS1_AD_UNSUPPORTED_EXTENSION); 827 case SSL_AD_CERTIFICATE_UNOBTAINABLE: 828 return (TLS1_AD_CERTIFICATE_UNOBTAINABLE); 829 case SSL_AD_UNRECOGNIZED_NAME: 830 return (TLS1_AD_UNRECOGNIZED_NAME); 831 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: 832 return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 833 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: 834 return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 835 case SSL_AD_UNKNOWN_PSK_IDENTITY: 836 return (TLS1_AD_UNKNOWN_PSK_IDENTITY); 837 default: 838 return (-1); 839 } 840 } 841