1/* ssl/t1_enc.c */ 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 <stdio.h> 139#include "ssl_locl.h" 140#ifndef OPENSSL_NO_COMP 141#include <openssl/comp.h> 142#endif 143#include <openssl/evp.h> 144#include <openssl/hmac.h> 145#include <openssl/md5.h> 146#include <openssl/rand.h> 147#ifdef KSSL_DEBUG 148#include <openssl/des.h> 149#endif 150 151/* seed1 through seed5 are virtually concatenated */ 152static int tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 153 int sec_len, 154 const void *seed1, int seed1_len, 155 const void *seed2, int seed2_len, 156 const void *seed3, int seed3_len, 157 const void *seed4, int seed4_len, 158 const void *seed5, int seed5_len, 159 unsigned char *out, int olen) 160 { 161 int chunk; 162 size_t j; 163 EVP_MD_CTX ctx, ctx_tmp; 164 EVP_PKEY *mac_key; 165 unsigned char A1[EVP_MAX_MD_SIZE]; 166 size_t A1_len; 167 int ret = 0; 168 169 chunk=EVP_MD_size(md); 170 OPENSSL_assert(chunk >= 0); 171 172 EVP_MD_CTX_init(&ctx); 173 EVP_MD_CTX_init(&ctx_tmp); 174 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 175 EVP_MD_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 176 mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, sec, sec_len); 177 if (!mac_key) 178 goto err; 179 if (!EVP_DigestSignInit(&ctx,NULL,md, NULL, mac_key)) 180 goto err; 181 if (!EVP_DigestSignInit(&ctx_tmp,NULL,md, NULL, mac_key)) 182 goto err; 183 if (seed1 && !EVP_DigestSignUpdate(&ctx,seed1,seed1_len)) 184 goto err; 185 if (seed2 && !EVP_DigestSignUpdate(&ctx,seed2,seed2_len)) 186 goto err; 187 if (seed3 && !EVP_DigestSignUpdate(&ctx,seed3,seed3_len)) 188 goto err; 189 if (seed4 && !EVP_DigestSignUpdate(&ctx,seed4,seed4_len)) 190 goto err; 191 if (seed5 && !EVP_DigestSignUpdate(&ctx,seed5,seed5_len)) 192 goto err; 193 if (!EVP_DigestSignFinal(&ctx,A1,&A1_len)) 194 goto err; 195 196 for (;;) 197 { 198 /* Reinit mac contexts */ 199 if (!EVP_DigestSignInit(&ctx,NULL,md, NULL, mac_key)) 200 goto err; 201 if (!EVP_DigestSignInit(&ctx_tmp,NULL,md, NULL, mac_key)) 202 goto err; 203 if (!EVP_DigestSignUpdate(&ctx,A1,A1_len)) 204 goto err; 205 if (!EVP_DigestSignUpdate(&ctx_tmp,A1,A1_len)) 206 goto err; 207 if (seed1 && !EVP_DigestSignUpdate(&ctx,seed1,seed1_len)) 208 goto err; 209 if (seed2 && !EVP_DigestSignUpdate(&ctx,seed2,seed2_len)) 210 goto err; 211 if (seed3 && !EVP_DigestSignUpdate(&ctx,seed3,seed3_len)) 212 goto err; 213 if (seed4 && !EVP_DigestSignUpdate(&ctx,seed4,seed4_len)) 214 goto err; 215 if (seed5 && !EVP_DigestSignUpdate(&ctx,seed5,seed5_len)) 216 goto err; 217 218 if (olen > chunk) 219 { 220 if (!EVP_DigestSignFinal(&ctx,out,&j)) 221 goto err; 222 out+=j; 223 olen-=j; 224 /* calc the next A1 value */ 225 if (!EVP_DigestSignFinal(&ctx_tmp,A1,&A1_len)) 226 goto err; 227 } 228 else /* last one */ 229 { 230 if (!EVP_DigestSignFinal(&ctx,A1,&A1_len)) 231 goto err; 232 memcpy(out,A1,olen); 233 break; 234 } 235 } 236 ret = 1; 237err: 238 EVP_PKEY_free(mac_key); 239 EVP_MD_CTX_cleanup(&ctx); 240 EVP_MD_CTX_cleanup(&ctx_tmp); 241 OPENSSL_cleanse(A1,sizeof(A1)); 242 return ret; 243 } 244 245/* seed1 through seed5 are virtually concatenated */ 246static int tls1_PRF(long digest_mask, 247 const void *seed1, int seed1_len, 248 const void *seed2, int seed2_len, 249 const void *seed3, int seed3_len, 250 const void *seed4, int seed4_len, 251 const void *seed5, int seed5_len, 252 const unsigned char *sec, int slen, 253 unsigned char *out1, 254 unsigned char *out2, int olen) 255 { 256 int len,i,idx,count; 257 const unsigned char *S1; 258 long m; 259 const EVP_MD *md; 260 int ret = 0; 261 262 /* Count number of digests and partition sec evenly */ 263 count=0; 264 for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) { 265 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++; 266 } 267 len=slen/count; 268 if (count == 1) 269 slen = 0; 270 S1=sec; 271 memset(out1,0,olen); 272 for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) { 273 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) { 274 if (!md) { 275 SSLerr(SSL_F_TLS1_PRF, 276 SSL_R_UNSUPPORTED_DIGEST_TYPE); 277 goto err; 278 } 279 if (!tls1_P_hash(md ,S1,len+(slen&1), 280 seed1,seed1_len,seed2,seed2_len,seed3,seed3_len,seed4,seed4_len,seed5,seed5_len, 281 out2,olen)) 282 goto err; 283 S1+=len; 284 for (i=0; i<olen; i++) 285 { 286 out1[i]^=out2[i]; 287 } 288 } 289 } 290 ret = 1; 291err: 292 return ret; 293} 294static int tls1_generate_key_block(SSL *s, unsigned char *km, 295 unsigned char *tmp, int num) 296 { 297 int ret; 298 ret = tls1_PRF(ssl_get_algorithm2(s), 299 TLS_MD_KEY_EXPANSION_CONST,TLS_MD_KEY_EXPANSION_CONST_SIZE, 300 s->s3->server_random,SSL3_RANDOM_SIZE, 301 s->s3->client_random,SSL3_RANDOM_SIZE, 302 NULL,0,NULL,0, 303 s->session->master_key,s->session->master_key_length, 304 km,tmp,num); 305#ifdef KSSL_DEBUG 306 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 307 s->session->master_key_length); 308 { 309 int i; 310 for (i=0; i < s->session->master_key_length; i++) 311 { 312 printf("%02X", s->session->master_key[i]); 313 } 314 printf("\n"); } 315#endif /* KSSL_DEBUG */ 316 return ret; 317 } 318 319/* tls1_aead_ctx_init allocates |*aead_ctx|, if needed and returns 1. It 320 * returns 0 on malloc error. */ 321static int tls1_aead_ctx_init(SSL_AEAD_CTX **aead_ctx) 322 { 323 if (*aead_ctx != NULL) 324 EVP_AEAD_CTX_cleanup(&(*aead_ctx)->ctx); 325 else 326 { 327 *aead_ctx = (SSL_AEAD_CTX*) OPENSSL_malloc(sizeof(SSL_AEAD_CTX)); 328 if (*aead_ctx == NULL) 329 { 330 SSLerr(SSL_F_TLS1_AEAD_CTX_INIT, ERR_R_MALLOC_FAILURE); 331 return 0; 332 } 333 } 334 335 return 1; 336 } 337 338static int tls1_change_cipher_state_aead(SSL *s, char is_read, 339 const unsigned char *key, unsigned key_len, 340 const unsigned char *iv, unsigned iv_len) 341 { 342 const EVP_AEAD *aead = s->s3->tmp.new_aead; 343 SSL_AEAD_CTX *aead_ctx; 344 345 if (is_read) 346 { 347 if (!tls1_aead_ctx_init(&s->aead_read_ctx)) 348 return 0; 349 aead_ctx = s->aead_read_ctx; 350 } 351 else 352 { 353 if (!tls1_aead_ctx_init(&s->aead_write_ctx)) 354 return 0; 355 aead_ctx = s->aead_write_ctx; 356 } 357 358 if (!EVP_AEAD_CTX_init(&aead_ctx->ctx, aead, key, key_len, 359 EVP_AEAD_DEFAULT_TAG_LENGTH, NULL /* engine */)) 360 return 0; 361 if (iv_len > sizeof(aead_ctx->fixed_nonce)) 362 { 363 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE_AEAD, ERR_R_INTERNAL_ERROR); 364 return 0; 365 } 366 memcpy(aead_ctx->fixed_nonce, iv, iv_len); 367 aead_ctx->fixed_nonce_len = iv_len; 368 aead_ctx->variable_nonce_len = 8; /* always the case, currently. */ 369 aead_ctx->variable_nonce_included_in_record = 370 (s->s3->tmp.new_cipher->algorithm2 & SSL_CIPHER_ALGORITHM2_VARIABLE_NONCE_INCLUDED_IN_RECORD) != 0; 371 if (aead_ctx->variable_nonce_len + aead_ctx->fixed_nonce_len != EVP_AEAD_nonce_length(aead)) 372 { 373 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE_AEAD, ERR_R_INTERNAL_ERROR); 374 return 0; 375 } 376 aead_ctx->tag_len = EVP_AEAD_max_overhead(aead); 377 378 return 1; 379 } 380 381/* tls1_change_cipher_state_cipher performs the work needed to switch cipher 382 * states when using EVP_CIPHER. The argument |is_read| is true iff this 383 * function is being called due to reading, as opposed to writing, a 384 * ChangeCipherSpec message. In order to support export ciphersuites, 385 * use_client_keys indicates whether the key material provided is in the 386 * "client write" direction. */ 387static int tls1_change_cipher_state_cipher( 388 SSL *s, char is_read, char use_client_keys, 389 const unsigned char *mac_secret, unsigned mac_secret_len, 390 const unsigned char *key, unsigned key_len, 391 const unsigned char *iv, unsigned iv_len) 392 { 393 const EVP_CIPHER *cipher = s->s3->tmp.new_sym_enc; 394 const char is_export = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) != 0; 395 EVP_CIPHER_CTX *cipher_ctx; 396 EVP_MD_CTX *mac_ctx; 397 char is_aead_cipher; 398 399 unsigned char export_tmp1[EVP_MAX_KEY_LENGTH]; 400 unsigned char export_tmp2[EVP_MAX_KEY_LENGTH]; 401 unsigned char export_iv1[EVP_MAX_IV_LENGTH * 2]; 402 unsigned char export_iv2[EVP_MAX_IV_LENGTH * 2]; 403 404 if (is_read) 405 { 406 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) 407 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM; 408 else 409 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM; 410 411 if (s->enc_read_ctx != NULL) 412 EVP_CIPHER_CTX_cleanup(s->enc_read_ctx); 413 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 414 goto err; 415 else 416 /* make sure it's intialized in case we exit later with an error */ 417 EVP_CIPHER_CTX_init(s->enc_read_ctx); 418 419 cipher_ctx = s->enc_read_ctx; 420 mac_ctx = ssl_replace_hash(&s->read_hash, NULL); 421 422 memcpy(s->s3->read_mac_secret, mac_secret, mac_secret_len); 423 s->s3->read_mac_secret_size = mac_secret_len; 424 } 425 else 426 { 427 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) 428 s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM; 429 else 430 s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM; 431 432 if (s->enc_write_ctx != NULL) 433 EVP_CIPHER_CTX_cleanup(s->enc_write_ctx); 434 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 435 goto err; 436 else 437 /* make sure it's intialized in case we exit later with an error */ 438 EVP_CIPHER_CTX_init(s->enc_write_ctx); 439 440 cipher_ctx = s->enc_write_ctx; 441 mac_ctx = ssl_replace_hash(&s->write_hash, NULL); 442 443 memcpy(s->s3->write_mac_secret, mac_secret, mac_secret_len); 444 s->s3->write_mac_secret_size = mac_secret_len; 445 } 446 447 if (is_export) 448 { 449 /* In here I set both the read and write key/iv to the 450 * same value since only the correct one will be used :-). 451 */ 452 const unsigned char *label; 453 unsigned label_len; 454 455 if (use_client_keys) 456 { 457 label = (const unsigned char*) TLS_MD_CLIENT_WRITE_KEY_CONST; 458 label_len = TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 459 } 460 else 461 { 462 label = (const unsigned char*) TLS_MD_SERVER_WRITE_KEY_CONST; 463 label_len = TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 464 } 465 466 if (!tls1_PRF(ssl_get_algorithm2(s), 467 label, label_len, 468 s->s3->client_random, SSL3_RANDOM_SIZE, 469 s->s3->server_random, SSL3_RANDOM_SIZE, 470 NULL, 0, NULL, 0, 471 key /* secret */, key_len /* secret length */, 472 export_tmp1 /* output */, 473 export_tmp2 /* scratch space */, 474 EVP_CIPHER_key_length(s->s3->tmp.new_sym_enc) /* output length */)) 475 return 0; 476 key = export_tmp1; 477 478 if (iv_len > 0) 479 { 480 static const unsigned char empty[] = ""; 481 482 if (!tls1_PRF(ssl_get_algorithm2(s), 483 TLS_MD_IV_BLOCK_CONST, TLS_MD_IV_BLOCK_CONST_SIZE, 484 s->s3->client_random, SSL3_RANDOM_SIZE, 485 s->s3->server_random, SSL3_RANDOM_SIZE, 486 NULL, 0, NULL, 0, 487 empty /* secret */ ,0 /* secret length */, 488 export_iv1 /* output */, 489 export_iv2 /* scratch space */, 490 iv_len * 2 /* output length */)) 491 return 0; 492 493 if (use_client_keys) 494 iv = export_iv1; 495 else 496 iv = &export_iv1[iv_len]; 497 } 498 } 499 500 /* is_aead_cipher indicates whether the EVP_CIPHER implements an AEAD 501 * interface. This is different from the newer EVP_AEAD interface. */ 502 is_aead_cipher = (EVP_CIPHER_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) != 0; 503 504 if (!is_aead_cipher) 505 { 506 EVP_PKEY *mac_key = 507 EVP_PKEY_new_mac_key(s->s3->tmp.new_mac_pkey_type, 508 NULL, mac_secret, mac_secret_len); 509 if (!mac_key) 510 return 0; 511 EVP_DigestSignInit(mac_ctx, NULL, s->s3->tmp.new_hash, NULL, mac_key); 512 EVP_PKEY_free(mac_key); 513 } 514 515 if (EVP_CIPHER_mode(cipher) == EVP_CIPH_GCM_MODE) 516 { 517 EVP_CipherInit_ex(cipher_ctx, cipher, NULL /* engine */, key, 518 NULL /* iv */, !is_read); 519 EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_GCM_SET_IV_FIXED, iv_len, (void*) iv); 520 } 521 else 522 EVP_CipherInit_ex(cipher_ctx, cipher, NULL /* engine */, key, iv, !is_read); 523 524 /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */ 525 if (is_aead_cipher && mac_secret_len > 0) 526 EVP_CIPHER_CTX_ctrl(cipher_ctx, EVP_CTRL_AEAD_SET_MAC_KEY, 527 mac_secret_len, (void*) mac_secret); 528 529 if (is_export) 530 { 531 OPENSSL_cleanse(export_tmp1, sizeof(export_tmp1)); 532 OPENSSL_cleanse(export_tmp2, sizeof(export_tmp1)); 533 OPENSSL_cleanse(export_iv1, sizeof(export_iv1)); 534 OPENSSL_cleanse(export_iv2, sizeof(export_iv2)); 535 } 536 537 return 1; 538 539err: 540 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE_CIPHER, ERR_R_MALLOC_FAILURE); 541 return 0; 542 } 543 544int tls1_change_cipher_state(SSL *s, int which) 545 { 546 /* is_read is true if we have just read a ChangeCipherSpec message - 547 * i.e. we need to update the read cipherspec. Otherwise we have just 548 * written one. */ 549 const char is_read = (which & SSL3_CC_READ) != 0; 550 /* use_client_keys is true if we wish to use the keys for the "client 551 * write" direction. This is the case if we're a client sending a 552 * ChangeCipherSpec, or a server reading a client's ChangeCipherSpec. */ 553 const char use_client_keys = which == SSL3_CHANGE_CIPHER_CLIENT_WRITE || 554 which == SSL3_CHANGE_CIPHER_SERVER_READ; 555 const unsigned char *client_write_mac_secret, *server_write_mac_secret, *mac_secret; 556 const unsigned char *client_write_key, *server_write_key, *key; 557 const unsigned char *client_write_iv, *server_write_iv, *iv; 558 const EVP_CIPHER *cipher = s->s3->tmp.new_sym_enc; 559 const EVP_AEAD *aead = s->s3->tmp.new_aead; 560 unsigned key_len, iv_len, mac_secret_len; 561 const unsigned char *key_data; 562 const char is_export = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) != 0; 563 564 /* Update compression contexts. */ 565#ifndef OPENSSL_NO_COMP 566 const SSL_COMP *comp = s->s3->tmp.new_compression; 567 568 if (is_read) 569 { 570 if (s->expand != NULL) 571 { 572 COMP_CTX_free(s->expand); 573 s->expand = NULL; 574 } 575 if (comp != NULL) 576 { 577 s->expand=COMP_CTX_new(comp->method); 578 if (s->expand == NULL) 579 { 580 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 581 return 0; 582 } 583 if (s->s3->rrec.comp == NULL) 584 s->s3->rrec.comp = 585 (unsigned char *)OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 586 if (s->s3->rrec.comp == NULL) 587 goto err; 588 } 589 } 590 else 591 { 592 if (s->compress != NULL) 593 { 594 COMP_CTX_free(s->compress); 595 s->compress = NULL; 596 } 597 if (comp != NULL) 598 { 599 s->compress = COMP_CTX_new(comp->method); 600 if (s->compress == NULL) 601 { 602 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 603 return 0; 604 } 605 } 606 } 607#endif /* OPENSSL_NO_COMP */ 608 609 /* Reset sequence number to zero. */ 610 memset(is_read ? s->s3->read_sequence : s->s3->write_sequence, 0, 8); 611 612 /* key_arg is used for SSLv2. We don't need it for TLS. */ 613 s->session->key_arg_length = 0; 614 615 mac_secret_len = s->s3->tmp.new_mac_secret_size; 616 617 if (aead != NULL) 618 { 619 key_len = EVP_AEAD_key_length(aead); 620 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(s->s3->tmp.new_cipher); 621 } 622 else 623 { 624 key_len = EVP_CIPHER_key_length(cipher); 625 if (is_export && key_len > SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) 626 key_len = SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher); 627 628 if (EVP_CIPHER_mode(cipher) == EVP_CIPH_GCM_MODE) 629 iv_len = EVP_GCM_TLS_FIXED_IV_LEN; 630 else 631 iv_len = EVP_CIPHER_iv_length(cipher); 632 } 633 634 key_data = s->s3->tmp.key_block; 635 client_write_mac_secret = key_data; key_data += mac_secret_len; 636 server_write_mac_secret = key_data; key_data += mac_secret_len; 637 client_write_key = key_data; key_data += key_len; 638 server_write_key = key_data; key_data += key_len; 639 client_write_iv = key_data; key_data += iv_len; 640 server_write_iv = key_data; key_data += iv_len; 641 642 if (use_client_keys) 643 { 644 mac_secret = client_write_mac_secret; 645 key = client_write_key; 646 iv = client_write_iv; 647 } 648 else 649 { 650 mac_secret = server_write_mac_secret; 651 key = server_write_key; 652 iv = server_write_iv; 653 } 654 655 if (key_data - s->s3->tmp.key_block != s->s3->tmp.key_block_length) 656 { 657 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 658 return 0; 659 } 660 661 if (aead != NULL) 662 { 663 if (!tls1_change_cipher_state_aead(s, is_read, 664 key, key_len, iv, iv_len)) 665 return 0; 666 } 667 else 668 { 669 if (!tls1_change_cipher_state_cipher(s, is_read, use_client_keys, 670 mac_secret, mac_secret_len, 671 key, key_len, 672 iv, iv_len)) 673 return 0; 674 } 675 676 return 1; 677err: 678 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); 679 return 0; 680 } 681 682int tls1_setup_key_block(SSL *s) 683 { 684 unsigned char *p1,*p2=NULL; 685 const EVP_CIPHER *c = NULL; 686 const EVP_MD *hash = NULL; 687 const EVP_AEAD *aead = NULL; 688 int num; 689 SSL_COMP *comp; 690 int mac_type= NID_undef,mac_secret_size=0; 691 int ret=0; 692 unsigned key_len, iv_len; 693 694#ifdef KSSL_DEBUG 695 printf ("tls1_setup_key_block()\n"); 696#endif /* KSSL_DEBUG */ 697 698 if (s->s3->tmp.key_block_length != 0) 699 return(1); 700 701 if (!ssl_cipher_get_comp(s->session, &comp)) 702 goto cipher_unavailable_err; 703 704 if (s->session->cipher && 705 (s->session->cipher->algorithm2 & SSL_CIPHER_ALGORITHM2_AEAD)) 706 { 707 if (!ssl_cipher_get_evp_aead(s->session, &aead)) 708 goto cipher_unavailable_err; 709 key_len = EVP_AEAD_key_length(aead); 710 iv_len = SSL_CIPHER_AEAD_FIXED_NONCE_LEN(s->session->cipher); 711 } 712 else 713 { 714 if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size)) 715 goto cipher_unavailable_err; 716 key_len = EVP_CIPHER_key_length(c); 717 718 if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) 719 iv_len = EVP_GCM_TLS_FIXED_IV_LEN; 720 else 721 iv_len = EVP_CIPHER_iv_length(c); 722 } 723 724 s->s3->tmp.new_aead=aead; 725 s->s3->tmp.new_sym_enc=c; 726 s->s3->tmp.new_hash=hash; 727 s->s3->tmp.new_mac_pkey_type = mac_type; 728 s->s3->tmp.new_mac_secret_size = mac_secret_size; 729 730 num=key_len+mac_secret_size+iv_len; 731 num*=2; 732 733 ssl3_cleanup_key_block(s); 734 735 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 736 { 737 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 738 goto err; 739 } 740 741 s->s3->tmp.key_block_length=num; 742 s->s3->tmp.key_block=p1; 743 744 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 745 { 746 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 747 goto err; 748 } 749 750#ifdef TLS_DEBUG 751printf("client random\n"); 752{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 753printf("server random\n"); 754{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 755printf("pre-master\n"); 756{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 757#endif 758 if (!tls1_generate_key_block(s,p1,p2,num)) 759 goto err; 760#ifdef TLS_DEBUG 761printf("\nkey block\n"); 762{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 763#endif 764 765 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) 766 && s->method->version <= TLS1_VERSION) 767 { 768 /* enable vulnerability countermeasure for CBC ciphers with 769 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 770 */ 771 s->s3->need_empty_fragments = 1; 772 773 if (s->session->cipher != NULL) 774 { 775 if (s->session->cipher->algorithm_enc == SSL_eNULL) 776 s->s3->need_empty_fragments = 0; 777 778#ifndef OPENSSL_NO_RC4 779 if (s->session->cipher->algorithm_enc == SSL_RC4) 780 s->s3->need_empty_fragments = 0; 781#endif 782 } 783 } 784 785 ret = 1; 786err: 787 if (p2) 788 { 789 OPENSSL_cleanse(p2,num); 790 OPENSSL_free(p2); 791 } 792 return(ret); 793 794cipher_unavailable_err: 795 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 796 return 0; 797 } 798 799/* tls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. 800 * 801 * Returns: 802 * 0: (in non-constant time) if the record is publically invalid (i.e. too 803 * short etc). 804 * 1: if the record's padding is valid / the encryption was successful. 805 * -1: if the record's padding/AEAD-authenticator is invalid or, if sending, 806 * an internal error occured. 807 */ 808int tls1_enc(SSL *s, int send) 809 { 810 SSL3_RECORD *rec; 811 EVP_CIPHER_CTX *ds; 812 unsigned long l; 813 int bs,i,j,k,pad=0,ret,mac_size=0; 814 const EVP_CIPHER *enc; 815 const SSL_AEAD_CTX *aead; 816 817 if (send) 818 rec = &s->s3->wrec; 819 else 820 rec = &s->s3->rrec; 821 822 if (send) 823 aead = s->aead_write_ctx; 824 else 825 aead = s->aead_read_ctx; 826 827 if (aead) 828 { 829 unsigned char ad[13], *seq, *in, *out, nonce[16]; 830 unsigned nonce_used; 831 ssize_t n; 832 833 seq = send ? s->s3->write_sequence : s->s3->read_sequence; 834 835 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 836 { 837 unsigned char dtlsseq[9], *p = dtlsseq; 838 839 s2n(send ? s->d1->w_epoch : s->d1->r_epoch, p); 840 memcpy(p, &seq[2], 6); 841 memcpy(ad, dtlsseq, 8); 842 } 843 else 844 { 845 memcpy(ad, seq, 8); 846 for (i=7; i>=0; i--) /* increment */ 847 { 848 ++seq[i]; 849 if (seq[i] != 0) 850 break; 851 } 852 } 853 854 ad[8] = rec->type; 855 ad[9] = (unsigned char)(s->version>>8); 856 ad[10] = (unsigned char)(s->version); 857 858 if (aead->fixed_nonce_len + aead->variable_nonce_len > sizeof(nonce) || 859 aead->variable_nonce_len > 8) 860 return -1; /* internal error - should never happen. */ 861 862 memcpy(nonce, aead->fixed_nonce, aead->fixed_nonce_len); 863 nonce_used = aead->fixed_nonce_len; 864 865 if (send) 866 { 867 size_t len = rec->length; 868 size_t eivlen = 0; 869 in = rec->input; 870 out = rec->data; 871 872 /* When sending we use the sequence number as the 873 * variable part of the nonce. */ 874 if (aead->variable_nonce_len > 8) 875 return -1; 876 memcpy(nonce + nonce_used, ad, aead->variable_nonce_len); 877 nonce_used += aead->variable_nonce_len; 878 879 /* in do_ssl3_write, rec->input is moved forward by 880 * variable_nonce_len in order to leave space for the 881 * variable nonce. Thus we can copy the sequence number 882 * bytes into place without overwriting any of the 883 * plaintext. */ 884 if (aead->variable_nonce_included_in_record) 885 { 886 memcpy(out, ad, aead->variable_nonce_len); 887 len -= aead->variable_nonce_len; 888 eivlen = aead->variable_nonce_len; 889 } 890 891 ad[11] = len >> 8; 892 ad[12] = len & 0xff; 893 894 n = EVP_AEAD_CTX_seal(&aead->ctx, 895 out + eivlen, len + aead->tag_len, 896 nonce, nonce_used, 897 in + eivlen, len, 898 ad, sizeof(ad)); 899 if (n >= 0 && aead->variable_nonce_included_in_record) 900 n += aead->variable_nonce_len; 901 } 902 else 903 { 904 /* receive */ 905 size_t len = rec->length; 906 907 if (rec->data != rec->input) 908 return -1; /* internal error - should never happen. */ 909 out = in = rec->input; 910 911 if (len < aead->variable_nonce_len) 912 return 0; 913 memcpy(nonce + nonce_used, 914 aead->variable_nonce_included_in_record ? in : ad, 915 aead->variable_nonce_len); 916 nonce_used += aead->variable_nonce_len; 917 918 if (aead->variable_nonce_included_in_record) 919 { 920 in += aead->variable_nonce_len; 921 len -= aead->variable_nonce_len; 922 out += aead->variable_nonce_len; 923 } 924 925 if (len < aead->tag_len) 926 return 0; 927 len -= aead->tag_len; 928 929 ad[11] = len >> 8; 930 ad[12] = len & 0xff; 931 932 n = EVP_AEAD_CTX_open(&aead->ctx, out, len, nonce, nonce_used, 933 in, len + aead->tag_len, ad, sizeof(ad)); 934 935 rec->data = rec->input = out; 936 } 937 938 if (n == -1) 939 return -1; 940 rec->length = n; 941 return 1; 942 } 943 944 if (send) 945 { 946 if (EVP_MD_CTX_md(s->write_hash)) 947 { 948 int n=EVP_MD_CTX_size(s->write_hash); 949 OPENSSL_assert(n >= 0); 950 } 951 ds=s->enc_write_ctx; 952 rec= &(s->s3->wrec); 953 if (s->enc_write_ctx == NULL) 954 enc=NULL; 955 else 956 { 957 int ivlen; 958 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 959 /* For TLSv1.1 and later explicit IV */ 960 if (s->version >= TLS1_1_VERSION 961 && EVP_CIPHER_mode(enc) == EVP_CIPH_CBC_MODE) 962 ivlen = EVP_CIPHER_iv_length(enc); 963 else 964 ivlen = 0; 965 if (ivlen > 1) 966 { 967 if ( rec->data != rec->input) 968 /* we can't write into the input stream: 969 * Can this ever happen?? (steve) 970 */ 971 fprintf(stderr, 972 "%s:%d: rec->data != rec->input\n", 973 __FILE__, __LINE__); 974 else if (RAND_bytes(rec->input, ivlen) <= 0) 975 return -1; 976 } 977 } 978 } 979 else 980 { 981 if (EVP_MD_CTX_md(s->read_hash)) 982 { 983 int n=EVP_MD_CTX_size(s->read_hash); 984 OPENSSL_assert(n >= 0); 985 } 986 ds=s->enc_read_ctx; 987 rec= &(s->s3->rrec); 988 if (s->enc_read_ctx == NULL) 989 enc=NULL; 990 else 991 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 992 } 993 994#ifdef KSSL_DEBUG 995 printf("tls1_enc(%d)\n", send); 996#endif /* KSSL_DEBUG */ 997 998 if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) 999 { 1000 memmove(rec->data,rec->input,rec->length); 1001 rec->input=rec->data; 1002 ret = 1; 1003 } 1004 else 1005 { 1006 l=rec->length; 1007 bs=EVP_CIPHER_block_size(ds->cipher); 1008 1009 if (EVP_CIPHER_flags(ds->cipher)&EVP_CIPH_FLAG_AEAD_CIPHER) 1010 { 1011 unsigned char buf[13],*seq; 1012 1013 seq = send?s->s3->write_sequence:s->s3->read_sequence; 1014 1015 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) 1016 { 1017 unsigned char dtlsseq[9],*p=dtlsseq; 1018 1019 s2n(send?s->d1->w_epoch:s->d1->r_epoch,p); 1020 memcpy(p,&seq[2],6); 1021 memcpy(buf,dtlsseq,8); 1022 } 1023 else 1024 { 1025 memcpy(buf,seq,8); 1026 for (i=7; i>=0; i--) /* increment */ 1027 { 1028 ++seq[i]; 1029 if (seq[i] != 0) break; 1030 } 1031 } 1032 1033 buf[8]=rec->type; 1034 buf[9]=(unsigned char)(s->version>>8); 1035 buf[10]=(unsigned char)(s->version); 1036 buf[11]=rec->length>>8; 1037 buf[12]=rec->length&0xff; 1038 pad=EVP_CIPHER_CTX_ctrl(ds,EVP_CTRL_AEAD_TLS1_AAD,13,buf); 1039 if (send) 1040 { 1041 l+=pad; 1042 rec->length+=pad; 1043 } 1044 } 1045 else if ((bs != 1) && send) 1046 { 1047 i=bs-((int)l%bs); 1048 1049 /* Add weird padding of upto 256 bytes */ 1050 1051 /* we need to add 'i' padding bytes of value j */ 1052 j=i-1; 1053 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 1054 { 1055 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 1056 j++; 1057 } 1058 for (k=(int)l; k<(int)(l+i); k++) 1059 rec->input[k]=j; 1060 l+=i; 1061 rec->length+=i; 1062 } 1063 1064#ifdef KSSL_DEBUG 1065 { 1066 unsigned long ui; 1067 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 1068 ds,rec->data,rec->input,l); 1069 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", 1070 ds->buf_len, ds->cipher->key_len, 1071 DES_KEY_SZ, DES_SCHEDULE_SZ, 1072 ds->cipher->iv_len); 1073 printf("\t\tIV: "); 1074 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); 1075 printf("\n"); 1076 printf("\trec->input="); 1077 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); 1078 printf("\n"); 1079 } 1080#endif /* KSSL_DEBUG */ 1081 1082 if (!send) 1083 { 1084 if (l == 0 || l%bs != 0) 1085 return 0; 1086 } 1087 1088 i = EVP_Cipher(ds,rec->data,rec->input,l); 1089 if ((EVP_CIPHER_flags(ds->cipher)&EVP_CIPH_FLAG_CUSTOM_CIPHER) 1090 ?(i<0) 1091 :(i==0)) 1092 return -1; /* AEAD can fail to verify MAC */ 1093 if (EVP_CIPHER_mode(enc) == EVP_CIPH_GCM_MODE && !send) 1094 { 1095 rec->data += EVP_GCM_TLS_EXPLICIT_IV_LEN; 1096 rec->input += EVP_GCM_TLS_EXPLICIT_IV_LEN; 1097 rec->length -= EVP_GCM_TLS_EXPLICIT_IV_LEN; 1098 } 1099 1100#ifdef KSSL_DEBUG 1101 { 1102 unsigned long i; 1103 printf("\trec->data="); 1104 for (i=0; i<l; i++) 1105 printf(" %02x", rec->data[i]); printf("\n"); 1106 } 1107#endif /* KSSL_DEBUG */ 1108 1109 ret = 1; 1110 if (EVP_MD_CTX_md(s->read_hash) != NULL) 1111 mac_size = EVP_MD_CTX_size(s->read_hash); 1112 if ((bs != 1) && !send) 1113 ret = tls1_cbc_remove_padding(s, rec, bs, mac_size); 1114 if (pad && !send) 1115 rec->length -= pad; 1116 } 1117 return ret; 1118 } 1119 1120int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out) 1121 { 1122 unsigned int ret; 1123 EVP_MD_CTX ctx, *d=NULL; 1124 int i; 1125 1126 if (s->s3->handshake_buffer) 1127 if (!ssl3_digest_cached_records(s)) 1128 return 0; 1129 1130 for (i=0;i<SSL_MAX_DIGEST;i++) 1131 { 1132 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 1133 { 1134 d=s->s3->handshake_dgst[i]; 1135 break; 1136 } 1137 } 1138 if (!d) { 1139 SSLerr(SSL_F_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST); 1140 return 0; 1141 } 1142 1143 EVP_MD_CTX_init(&ctx); 1144 EVP_MD_CTX_copy_ex(&ctx,d); 1145 EVP_DigestFinal_ex(&ctx,out,&ret); 1146 EVP_MD_CTX_cleanup(&ctx); 1147 return((int)ret); 1148 } 1149 1150/* tls1_handshake_digest calculates the current handshake hash and writes it to 1151 * |out|, which has space for |out_len| bytes. It returns the number of bytes 1152 * written or -1 in the event of an error. This function works on a copy of the 1153 * underlying digests so can be called multiple times and prior to the final 1154 * update etc. */ 1155int tls1_handshake_digest(SSL *s, unsigned char *out, size_t out_len) 1156 { 1157 const EVP_MD *md; 1158 EVP_MD_CTX ctx; 1159 int i, err = 0, len = 0; 1160 long mask; 1161 1162 EVP_MD_CTX_init(&ctx); 1163 1164 for (i = 0; ssl_get_handshake_digest(i, &mask, &md); i++) 1165 { 1166 int hash_size; 1167 unsigned int digest_len; 1168 EVP_MD_CTX *hdgst = s->s3->handshake_dgst[i]; 1169 1170 if ((mask & ssl_get_algorithm2(s)) == 0) 1171 continue; 1172 1173 hash_size = EVP_MD_size(md); 1174 if (!hdgst || hash_size < 0 || (size_t)hash_size > out_len) 1175 { 1176 err = 1; 1177 break; 1178 } 1179 1180 if (!EVP_MD_CTX_copy_ex(&ctx, hdgst) || 1181 !EVP_DigestFinal_ex(&ctx, out, &digest_len) || 1182 digest_len != (unsigned int)hash_size) /* internal error */ 1183 { 1184 err = 1; 1185 break; 1186 } 1187 out += digest_len; 1188 out_len -= digest_len; 1189 len += digest_len; 1190 } 1191 1192 EVP_MD_CTX_cleanup(&ctx); 1193 1194 if (err != 0) 1195 return -1; 1196 return len; 1197 } 1198 1199int tls1_final_finish_mac(SSL *s, 1200 const char *str, int slen, unsigned char *out) 1201 { 1202 unsigned char buf[2*EVP_MAX_MD_SIZE]; 1203 unsigned char buf2[12]; 1204 int err=0; 1205 int digests_len; 1206 1207 if (s->s3->handshake_buffer) 1208 if (!ssl3_digest_cached_records(s)) 1209 return 0; 1210 1211 digests_len = tls1_handshake_digest(s, buf, sizeof(buf)); 1212 if (digests_len < 0) 1213 { 1214 err = 1; 1215 digests_len = 0; 1216 } 1217 1218 if (!tls1_PRF(ssl_get_algorithm2(s), 1219 str,slen, buf, digests_len, NULL,0, NULL,0, NULL,0, 1220 s->session->master_key,s->session->master_key_length, 1221 out,buf2,sizeof buf2)) 1222 err = 1; 1223 1224 if (err) 1225 return 0; 1226 else 1227 return sizeof buf2; 1228 } 1229 1230int tls1_mac(SSL *ssl, unsigned char *md, int send) 1231 { 1232 SSL3_RECORD *rec; 1233 unsigned char *seq; 1234 EVP_MD_CTX *hash; 1235 size_t md_size, orig_len; 1236 int i; 1237 EVP_MD_CTX hmac, *mac_ctx; 1238 unsigned char header[13]; 1239 int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM)); 1240 int t; 1241 1242 if (send) 1243 { 1244 rec= &(ssl->s3->wrec); 1245 seq= &(ssl->s3->write_sequence[0]); 1246 hash=ssl->write_hash; 1247 } 1248 else 1249 { 1250 rec= &(ssl->s3->rrec); 1251 seq= &(ssl->s3->read_sequence[0]); 1252 hash=ssl->read_hash; 1253 } 1254 1255 t=EVP_MD_CTX_size(hash); 1256 OPENSSL_assert(t >= 0); 1257 md_size=t; 1258 1259 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 1260 if (stream_mac) 1261 { 1262 mac_ctx = hash; 1263 } 1264 else 1265 { 1266 EVP_MD_CTX_copy(&hmac,hash); 1267 mac_ctx = &hmac; 1268 } 1269 1270 if (ssl->version == DTLS1_VERSION || ssl->version == DTLS1_BAD_VER) 1271 { 1272 unsigned char dtlsseq[8],*p=dtlsseq; 1273 1274 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p); 1275 memcpy (p,&seq[2],6); 1276 1277 memcpy(header, dtlsseq, 8); 1278 } 1279 else 1280 memcpy(header, seq, 8); 1281 1282 /* kludge: tls1_cbc_remove_padding passes padding length in rec->type */ 1283 orig_len = rec->length+md_size+((unsigned int)rec->type>>8); 1284 rec->type &= 0xff; 1285 1286 header[8]=rec->type; 1287 header[9]=(unsigned char)(ssl->version>>8); 1288 header[10]=(unsigned char)(ssl->version); 1289 header[11]=(rec->length)>>8; 1290 header[12]=(rec->length)&0xff; 1291 1292 if (!send && 1293 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && 1294 ssl3_cbc_record_digest_supported(mac_ctx)) 1295 { 1296 /* This is a CBC-encrypted record. We must avoid leaking any 1297 * timing-side channel information about how many blocks of 1298 * data we are hashing because that gives an attacker a 1299 * timing-oracle. */ 1300 ssl3_cbc_digest_record( 1301 mac_ctx, 1302 md, &md_size, 1303 header, rec->input, 1304 rec->length + md_size, orig_len, 1305 ssl->s3->read_mac_secret, 1306 ssl->s3->read_mac_secret_size, 1307 0 /* not SSLv3 */); 1308 } 1309 else 1310 { 1311 EVP_DigestSignUpdate(mac_ctx,header,sizeof(header)); 1312 EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length); 1313 t=EVP_DigestSignFinal(mac_ctx,md,&md_size); 1314 OPENSSL_assert(t > 0); 1315#ifdef OPENSSL_FIPS 1316 if (!send && FIPS_mode()) 1317 tls_fips_digest_extra( 1318 ssl->enc_read_ctx, 1319 mac_ctx, rec->input, 1320 rec->length, orig_len); 1321#endif 1322 } 1323 1324 if (!stream_mac) 1325 EVP_MD_CTX_cleanup(&hmac); 1326#ifdef TLS_DEBUG 1327printf("sec="); 1328{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 1329printf("seq="); 1330{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 1331printf("buf="); 1332{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 1333printf("rec="); 1334{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 1335#endif 1336 1337 if (ssl->version != DTLS1_VERSION && ssl->version != DTLS1_BAD_VER) 1338 { 1339 for (i=7; i>=0; i--) 1340 { 1341 ++seq[i]; 1342 if (seq[i] != 0) break; 1343 } 1344 } 1345 1346#ifdef TLS_DEBUG 1347{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 1348#endif 1349 return(md_size); 1350 } 1351 1352int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 1353 int len) 1354 { 1355 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 1356 const void *co = NULL, *so = NULL; 1357 int col = 0, sol = 0; 1358 1359 1360#ifdef KSSL_DEBUG 1361 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len); 1362#endif /* KSSL_DEBUG */ 1363 1364#ifdef TLSEXT_TYPE_opaque_prf_input 1365 if (s->s3->client_opaque_prf_input != NULL && s->s3->server_opaque_prf_input != NULL && 1366 s->s3->client_opaque_prf_input_len > 0 && 1367 s->s3->client_opaque_prf_input_len == s->s3->server_opaque_prf_input_len) 1368 { 1369 co = s->s3->client_opaque_prf_input; 1370 col = s->s3->server_opaque_prf_input_len; 1371 so = s->s3->server_opaque_prf_input; 1372 sol = s->s3->client_opaque_prf_input_len; /* must be same as col (see draft-rescorla-tls-opaque-prf-input-00.txt, section 3.1) */ 1373 } 1374#endif 1375 1376 tls1_PRF(ssl_get_algorithm2(s), 1377 TLS_MD_MASTER_SECRET_CONST,TLS_MD_MASTER_SECRET_CONST_SIZE, 1378 s->s3->client_random,SSL3_RANDOM_SIZE, 1379 co, col, 1380 s->s3->server_random,SSL3_RANDOM_SIZE, 1381 so, sol, 1382 p,len, 1383 s->session->master_key,buff,sizeof buff); 1384#ifdef SSL_DEBUG 1385 fprintf(stderr, "Premaster Secret:\n"); 1386 BIO_dump_fp(stderr, (char *)p, len); 1387 fprintf(stderr, "Client Random:\n"); 1388 BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE); 1389 fprintf(stderr, "Server Random:\n"); 1390 BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE); 1391 fprintf(stderr, "Master Secret:\n"); 1392 BIO_dump_fp(stderr, (char *)s->session->master_key, SSL3_MASTER_SECRET_SIZE); 1393#endif 1394 1395#ifdef KSSL_DEBUG 1396 printf ("tls1_generate_master_secret() complete\n"); 1397#endif /* KSSL_DEBUG */ 1398 return(SSL3_MASTER_SECRET_SIZE); 1399 } 1400 1401int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen, 1402 const char *label, size_t llen, const unsigned char *context, 1403 size_t contextlen, int use_context) 1404 { 1405 unsigned char *buff; 1406 unsigned char *val = NULL; 1407 size_t vallen, currentvalpos; 1408 int rv; 1409 1410#ifdef KSSL_DEBUG 1411 printf ("tls1_export_keying_material(%p,%p,%d,%s,%d,%p,%d)\n", s, out, olen, label, llen, p, plen); 1412#endif /* KSSL_DEBUG */ 1413 1414 buff = OPENSSL_malloc(olen); 1415 if (buff == NULL) goto err2; 1416 1417 /* construct PRF arguments 1418 * we construct the PRF argument ourself rather than passing separate 1419 * values into the TLS PRF to ensure that the concatenation of values 1420 * does not create a prohibited label. 1421 */ 1422 vallen = llen + SSL3_RANDOM_SIZE * 2; 1423 if (use_context) 1424 { 1425 vallen += 2 + contextlen; 1426 } 1427 1428 val = OPENSSL_malloc(vallen); 1429 if (val == NULL) goto err2; 1430 currentvalpos = 0; 1431 memcpy(val + currentvalpos, (unsigned char *) label, llen); 1432 currentvalpos += llen; 1433 memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE); 1434 currentvalpos += SSL3_RANDOM_SIZE; 1435 memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE); 1436 currentvalpos += SSL3_RANDOM_SIZE; 1437 1438 if (use_context) 1439 { 1440 val[currentvalpos] = (contextlen >> 8) & 0xff; 1441 currentvalpos++; 1442 val[currentvalpos] = contextlen & 0xff; 1443 currentvalpos++; 1444 if ((contextlen > 0) || (context != NULL)) 1445 { 1446 memcpy(val + currentvalpos, context, contextlen); 1447 } 1448 } 1449 1450 /* disallow prohibited labels 1451 * note that SSL3_RANDOM_SIZE > max(prohibited label len) = 1452 * 15, so size of val > max(prohibited label len) = 15 and the 1453 * comparisons won't have buffer overflow 1454 */ 1455 if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST, 1456 TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0) goto err1; 1457 if (memcmp(val, TLS_MD_SERVER_FINISH_CONST, 1458 TLS_MD_SERVER_FINISH_CONST_SIZE) == 0) goto err1; 1459 if (memcmp(val, TLS_MD_MASTER_SECRET_CONST, 1460 TLS_MD_MASTER_SECRET_CONST_SIZE) == 0) goto err1; 1461 if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST, 1462 TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0) goto err1; 1463 1464 rv = tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 1465 val, vallen, 1466 NULL, 0, 1467 NULL, 0, 1468 NULL, 0, 1469 NULL, 0, 1470 s->session->master_key,s->session->master_key_length, 1471 out,buff,olen); 1472 1473#ifdef KSSL_DEBUG 1474 printf ("tls1_export_keying_material() complete\n"); 1475#endif /* KSSL_DEBUG */ 1476 goto ret; 1477err1: 1478 SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL); 1479 rv = 0; 1480 goto ret; 1481err2: 1482 SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE); 1483 rv = 0; 1484ret: 1485 if (buff != NULL) OPENSSL_free(buff); 1486 if (val != NULL) OPENSSL_free(val); 1487 return(rv); 1488 } 1489 1490int tls1_alert_code(int code) 1491 { 1492 switch (code) 1493 { 1494 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 1495 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 1496 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 1497 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 1498 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 1499 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 1500 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 1501 case SSL_AD_NO_CERTIFICATE: return(-1); 1502 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 1503 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 1504 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 1505 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 1506 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 1507 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 1508 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 1509 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 1510 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 1511 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 1512 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 1513 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 1514 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 1515 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 1516 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 1517 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 1518 case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION); 1519 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE); 1520 case SSL_AD_UNRECOGNIZED_NAME: return(TLS1_AD_UNRECOGNIZED_NAME); 1521 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 1522 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 1523 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 1524 case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK); 1525#if 0 /* not appropriate for TLS, not used for DTLS */ 1526 case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 1527 (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 1528#endif 1529 default: return(-1); 1530 } 1531 } 1532