t1_enc.c revision 296465
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) 1998-2002 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#include <stdio.h> 113#include "ssl_locl.h" 114#ifndef OPENSSL_NO_COMP 115# include <openssl/comp.h> 116#endif 117#include <openssl/evp.h> 118#include <openssl/hmac.h> 119#include <openssl/md5.h> 120#ifdef KSSL_DEBUG 121# include <openssl/des.h> 122#endif 123 124static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 125 int sec_len, unsigned char *seed, int seed_len, 126 unsigned char *out, int olen) 127{ 128 int chunk; 129 unsigned int j; 130 HMAC_CTX ctx; 131 HMAC_CTX ctx_tmp; 132 unsigned char A1[EVP_MAX_MD_SIZE]; 133 unsigned int A1_len; 134 135 chunk = EVP_MD_size(md); 136 137 HMAC_CTX_init(&ctx); 138 HMAC_CTX_init(&ctx_tmp); 139 HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 140 HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 141 HMAC_Init_ex(&ctx, sec, sec_len, md, NULL); 142 HMAC_Init_ex(&ctx_tmp, sec, sec_len, md, NULL); 143 HMAC_Update(&ctx, seed, seed_len); 144 HMAC_Final(&ctx, A1, &A1_len); 145 146 for (;;) { 147 HMAC_Init_ex(&ctx, NULL, 0, NULL, NULL); /* re-init */ 148 HMAC_Init_ex(&ctx_tmp, NULL, 0, NULL, NULL); /* re-init */ 149 HMAC_Update(&ctx, A1, A1_len); 150 HMAC_Update(&ctx_tmp, A1, A1_len); 151 HMAC_Update(&ctx, seed, seed_len); 152 153 if (olen > chunk) { 154 HMAC_Final(&ctx, out, &j); 155 out += j; 156 olen -= j; 157 /* calc the next A1 value */ 158 HMAC_Final(&ctx_tmp, A1, &A1_len); 159 } else { /* last one */ 160 161 HMAC_Final(&ctx, A1, &A1_len); 162 memcpy(out, A1, olen); 163 break; 164 } 165 } 166 HMAC_CTX_cleanup(&ctx); 167 HMAC_CTX_cleanup(&ctx_tmp); 168 OPENSSL_cleanse(A1, sizeof(A1)); 169} 170 171static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1, 172 unsigned char *label, int label_len, 173 const unsigned char *sec, int slen, unsigned char *out1, 174 unsigned char *out2, int olen) 175{ 176 int len, i; 177 const unsigned char *S1, *S2; 178 179 len = slen / 2; 180 S1 = sec; 181 S2 = &(sec[len]); 182 len += (slen & 1); /* add for odd, make longer */ 183 184 tls1_P_hash(md5, S1, len, label, label_len, out1, olen); 185 tls1_P_hash(sha1, S2, len, label, label_len, out2, olen); 186 187 for (i = 0; i < olen; i++) 188 out1[i] ^= out2[i]; 189} 190 191static void tls1_generate_key_block(SSL *s, unsigned char *km, 192 unsigned char *tmp, int num) 193{ 194 unsigned char *p; 195 unsigned char buf[SSL3_RANDOM_SIZE * 2 + TLS_MD_MAX_CONST_SIZE]; 196 p = buf; 197 198 memcpy(p, TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE); 199 p += TLS_MD_KEY_EXPANSION_CONST_SIZE; 200 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 201 p += SSL3_RANDOM_SIZE; 202 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 203 p += SSL3_RANDOM_SIZE; 204 205 tls1_PRF(s->ctx->md5, s->ctx->sha1, buf, (int)(p - buf), 206 s->session->master_key, s->session->master_key_length, 207 km, tmp, num); 208#ifdef KSSL_DEBUG 209 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 210 s->session->master_key_length); 211 { 212 int i; 213 for (i = 0; i < s->session->master_key_length; i++) { 214 printf("%02X", s->session->master_key[i]); 215 } 216 printf("\n"); 217 } 218#endif /* KSSL_DEBUG */ 219} 220 221int tls1_change_cipher_state(SSL *s, int which) 222{ 223 static const unsigned char empty[] = ""; 224 unsigned char *p, *mac_secret; 225 unsigned char *exp_label, buf[TLS_MD_MAX_CONST_SIZE + 226 SSL3_RANDOM_SIZE * 2]; 227 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 228 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 229 unsigned char iv1[EVP_MAX_IV_LENGTH * 2]; 230 unsigned char iv2[EVP_MAX_IV_LENGTH * 2]; 231 unsigned char *ms, *key, *iv; 232 int client_write; 233 EVP_CIPHER_CTX *dd; 234 const EVP_CIPHER *c; 235#ifndef OPENSSL_NO_COMP 236 const SSL_COMP *comp; 237#endif 238 const EVP_MD *m; 239 int is_export, n, i, j, k, exp_label_len, cl; 240 int reuse_dd = 0; 241 242 is_export = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 243 c = s->s3->tmp.new_sym_enc; 244 m = s->s3->tmp.new_hash; 245#ifndef OPENSSL_NO_COMP 246 comp = s->s3->tmp.new_compression; 247#endif 248 249#ifdef KSSL_DEBUG 250 key_block = s->s3->tmp.key_block; 251 252 printf("tls1_change_cipher_state(which= %d) w/\n", which); 253 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms, 254 (void *)comp); 255 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c); 256 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n", 257 c->nid, c->block_size, c->key_len, c->iv_len); 258 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length); 259 { 260 int ki; 261 for (ki = 0; ki < s->s3->tmp.key_block_length; ki++) 262 printf("%02x", s->s3->tmp.key_block[ki]); 263 printf("\n"); 264 } 265#endif /* KSSL_DEBUG */ 266 267 if (which & SSL3_CC_READ) { 268 if (s->enc_read_ctx != NULL) 269 reuse_dd = 1; 270 else if ((s->enc_read_ctx = 271 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 272 goto err; 273 else 274 /* 275 * make sure it's intialized in case we exit later with an error 276 */ 277 EVP_CIPHER_CTX_init(s->enc_read_ctx); 278 dd = s->enc_read_ctx; 279 s->read_hash = m; 280#ifndef OPENSSL_NO_COMP 281 if (s->expand != NULL) { 282 COMP_CTX_free(s->expand); 283 s->expand = NULL; 284 } 285 if (comp != NULL) { 286 s->expand = COMP_CTX_new(comp->method); 287 if (s->expand == NULL) { 288 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, 289 SSL_R_COMPRESSION_LIBRARY_ERROR); 290 goto err2; 291 } 292 if (s->s3->rrec.comp == NULL) 293 s->s3->rrec.comp = (unsigned char *) 294 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 295 if (s->s3->rrec.comp == NULL) 296 goto err; 297 } 298#endif 299 /* 300 * this is done by dtls1_reset_seq_numbers for DTLS1_VERSION 301 */ 302 if (s->version != DTLS1_VERSION) 303 memset(&(s->s3->read_sequence[0]), 0, 8); 304 mac_secret = &(s->s3->read_mac_secret[0]); 305 } else { 306 if (s->enc_write_ctx != NULL) 307 reuse_dd = 1; 308 else if ((s->enc_write_ctx = 309 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 310 goto err; 311 else 312 /* 313 * make sure it's intialized in case we exit later with an error 314 */ 315 EVP_CIPHER_CTX_init(s->enc_write_ctx); 316 dd = s->enc_write_ctx; 317 s->write_hash = m; 318#ifndef OPENSSL_NO_COMP 319 if (s->compress != NULL) { 320 COMP_CTX_free(s->compress); 321 s->compress = NULL; 322 } 323 if (comp != NULL) { 324 s->compress = COMP_CTX_new(comp->method); 325 if (s->compress == NULL) { 326 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, 327 SSL_R_COMPRESSION_LIBRARY_ERROR); 328 goto err2; 329 } 330 } 331#endif 332 /* 333 * this is done by dtls1_reset_seq_numbers for DTLS1_VERSION 334 */ 335 if (s->version != DTLS1_VERSION) 336 memset(&(s->s3->write_sequence[0]), 0, 8); 337 mac_secret = &(s->s3->write_mac_secret[0]); 338 } 339 340 if (reuse_dd) 341 EVP_CIPHER_CTX_cleanup(dd); 342 343 p = s->s3->tmp.key_block; 344 i = EVP_MD_size(m); 345 cl = EVP_CIPHER_key_length(c); 346 j = is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 347 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 348 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 349 k = EVP_CIPHER_iv_length(c); 350 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 351 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) { 352 ms = &(p[0]); 353 n = i + i; 354 key = &(p[n]); 355 n += j + j; 356 iv = &(p[n]); 357 n += k + k; 358 exp_label = (unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 359 exp_label_len = TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 360 client_write = 1; 361 } else { 362 n = i; 363 ms = &(p[n]); 364 n += i + j; 365 key = &(p[n]); 366 n += j + k; 367 iv = &(p[n]); 368 n += k; 369 exp_label = (unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 370 exp_label_len = TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 371 client_write = 0; 372 } 373 374 if (n > s->s3->tmp.key_block_length) { 375 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); 376 goto err2; 377 } 378 379 memcpy(mac_secret, ms, i); 380#ifdef TLS_DEBUG 381 printf("which = %04X\nmac key=", which); 382 { 383 int z; 384 for (z = 0; z < i; z++) 385 printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n'); 386 } 387#endif 388 if (is_export) { 389 /* 390 * In here I set both the read and write key/iv to the same value 391 * since only the correct one will be used :-). 392 */ 393 p = buf; 394 memcpy(p, exp_label, exp_label_len); 395 p += exp_label_len; 396 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 397 p += SSL3_RANDOM_SIZE; 398 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 399 p += SSL3_RANDOM_SIZE; 400 tls1_PRF(s->ctx->md5, s->ctx->sha1, buf, (int)(p - buf), key, j, 401 tmp1, tmp2, EVP_CIPHER_key_length(c)); 402 key = tmp1; 403 404 if (k > 0) { 405 p = buf; 406 memcpy(p, TLS_MD_IV_BLOCK_CONST, TLS_MD_IV_BLOCK_CONST_SIZE); 407 p += TLS_MD_IV_BLOCK_CONST_SIZE; 408 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 409 p += SSL3_RANDOM_SIZE; 410 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 411 p += SSL3_RANDOM_SIZE; 412 tls1_PRF(s->ctx->md5, s->ctx->sha1, buf, p - buf, empty, 0, 413 iv1, iv2, k * 2); 414 if (client_write) 415 iv = iv1; 416 else 417 iv = &(iv1[k]); 418 } 419 } 420 421 s->session->key_arg_length = 0; 422#ifdef KSSL_DEBUG 423 { 424 int ki; 425 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n"); 426 printf("\tkey= "); 427 for (ki = 0; ki < c->key_len; ki++) 428 printf("%02x", key[ki]); 429 printf("\n"); 430 printf("\t iv= "); 431 for (ki = 0; ki < c->iv_len; ki++) 432 printf("%02x", iv[ki]); 433 printf("\n"); 434 } 435#endif /* KSSL_DEBUG */ 436 437 EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE)); 438#ifdef TLS_DEBUG 439 printf("which = %04X\nkey=", which); 440 { 441 int z; 442 for (z = 0; z < EVP_CIPHER_key_length(c); z++) 443 printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n'); 444 } 445 printf("\niv="); 446 { 447 int z; 448 for (z = 0; z < k; z++) 449 printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n'); 450 } 451 printf("\n"); 452#endif 453 454 OPENSSL_cleanse(tmp1, sizeof(tmp1)); 455 OPENSSL_cleanse(tmp2, sizeof(tmp1)); 456 OPENSSL_cleanse(iv1, sizeof(iv1)); 457 OPENSSL_cleanse(iv2, sizeof(iv2)); 458 return (1); 459 err: 460 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); 461 err2: 462 return (0); 463} 464 465int tls1_setup_key_block(SSL *s) 466{ 467 unsigned char *p1, *p2; 468 const EVP_CIPHER *c; 469 const EVP_MD *hash; 470 int num; 471 SSL_COMP *comp; 472 473#ifdef KSSL_DEBUG 474 printf("tls1_setup_key_block()\n"); 475#endif /* KSSL_DEBUG */ 476 477 if (s->s3->tmp.key_block_length != 0) 478 return (1); 479 480 if (!ssl_cipher_get_evp(s->session, &c, &hash, &comp)) { 481 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 482 return (0); 483 } 484 485 s->s3->tmp.new_sym_enc = c; 486 s->s3->tmp.new_hash = hash; 487 488 num = 489 EVP_CIPHER_key_length(c) + EVP_MD_size(hash) + 490 EVP_CIPHER_iv_length(c); 491 num *= 2; 492 493 ssl3_cleanup_key_block(s); 494 495 if ((p1 = (unsigned char *)OPENSSL_malloc(num)) == NULL) 496 goto err; 497 if ((p2 = (unsigned char *)OPENSSL_malloc(num)) == NULL) 498 goto err; 499 500 s->s3->tmp.key_block_length = num; 501 s->s3->tmp.key_block = p1; 502 503#ifdef TLS_DEBUG 504 printf("client random\n"); 505 { 506 int z; 507 for (z = 0; z < SSL3_RANDOM_SIZE; z++) 508 printf("%02X%c", s->s3->client_random[z], 509 ((z + 1) % 16) ? ' ' : '\n'); 510 } 511 printf("server random\n"); 512 { 513 int z; 514 for (z = 0; z < SSL3_RANDOM_SIZE; z++) 515 printf("%02X%c", s->s3->server_random[z], 516 ((z + 1) % 16) ? ' ' : '\n'); 517 } 518 printf("pre-master\n"); 519 { 520 int z; 521 for (z = 0; z < s->session->master_key_length; z++) 522 printf("%02X%c", s->session->master_key[z], 523 ((z + 1) % 16) ? ' ' : '\n'); 524 } 525#endif 526 tls1_generate_key_block(s, p1, p2, num); 527 OPENSSL_cleanse(p2, num); 528 OPENSSL_free(p2); 529#ifdef TLS_DEBUG 530 printf("\nkey block\n"); 531 { 532 int z; 533 for (z = 0; z < num; z++) 534 printf("%02X%c", p1[z], ((z + 1) % 16) ? ' ' : '\n'); 535 } 536#endif 537 538 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) { 539 /* 540 * enable vulnerability countermeasure for CBC ciphers with known-IV 541 * problem (http://www.openssl.org/~bodo/tls-cbc.txt) 542 */ 543 s->s3->need_empty_fragments = 1; 544 545 if (s->session->cipher != NULL) { 546 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 547 s->s3->need_empty_fragments = 0; 548 549#ifndef OPENSSL_NO_RC4 550 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 551 s->s3->need_empty_fragments = 0; 552#endif 553 } 554 } 555 556 return (1); 557 err: 558 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE); 559 return (0); 560} 561 562/*- 563 * tls1_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. 564 * 565 * Returns: 566 * 0: (in non-constant time) if the record is publically invalid (i.e. too 567 * short etc). 568 * 1: if the record's padding is valid / the encryption was successful. 569 * -1: if the record's padding/AEAD-authenticator is invalid or, if sending, 570 * an internal error occured. 571 */ 572int tls1_enc(SSL *s, int send) 573{ 574 SSL3_RECORD *rec; 575 EVP_CIPHER_CTX *ds; 576 unsigned long l; 577 int bs, i, j, k, pad = 0, ret, mac_size = 0; 578 const EVP_CIPHER *enc; 579 580 if (send) { 581 ds = s->enc_write_ctx; 582 rec = &(s->s3->wrec); 583 if (s->enc_write_ctx == NULL) 584 enc = NULL; 585 else 586 enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 587 } else { 588 ds = s->enc_read_ctx; 589 rec = &(s->s3->rrec); 590 if (s->enc_read_ctx == NULL) 591 enc = NULL; 592 else 593 enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 594 } 595 596#ifdef KSSL_DEBUG 597 printf("tls1_enc(%d)\n", send); 598#endif /* KSSL_DEBUG */ 599 600 if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { 601 memmove(rec->data, rec->input, rec->length); 602 rec->input = rec->data; 603 ret = 1; 604 } else { 605 l = rec->length; 606 bs = EVP_CIPHER_block_size(ds->cipher); 607 608 if ((bs != 1) && send) { 609 i = bs - ((int)l % bs); 610 611 /* Add weird padding of upto 256 bytes */ 612 613 /* we need to add 'i' padding bytes of value j */ 614 j = i - 1; 615 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) { 616 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 617 j++; 618 } 619 for (k = (int)l; k < (int)(l + i); k++) 620 rec->input[k] = j; 621 l += i; 622 rec->length += i; 623 } 624#ifdef KSSL_DEBUG 625 { 626 unsigned long ui; 627 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 628 ds, rec->data, rec->input, l); 629 printf 630 ("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", 631 ds->buf_len, ds->cipher->key_len, DES_KEY_SZ, 632 DES_SCHEDULE_SZ, ds->cipher->iv_len); 633 printf("\t\tIV: "); 634 for (i = 0; i < ds->cipher->iv_len; i++) 635 printf("%02X", ds->iv[i]); 636 printf("\n"); 637 printf("\trec->input="); 638 for (ui = 0; ui < l; ui++) 639 printf(" %02x", rec->input[ui]); 640 printf("\n"); 641 } 642#endif /* KSSL_DEBUG */ 643 644 if (!send) { 645 if (l == 0 || l % bs != 0) 646 return 0; 647 } 648 649 EVP_Cipher(ds, rec->data, rec->input, l); 650 651#ifdef KSSL_DEBUG 652 { 653 unsigned long ki; 654 printf("\trec->data="); 655 for (ki = 0; ki < l; i++) 656 printf(" %02x", rec->data[ki]); 657 printf("\n"); 658 } 659#endif /* KSSL_DEBUG */ 660 661 ret = 1; 662 if (s->read_hash != NULL) 663 mac_size = EVP_MD_size(s->read_hash); 664 if ((bs != 1) && !send) 665 ret = tls1_cbc_remove_padding(s, rec, bs, mac_size); 666 if (pad && !send) 667 rec->length -= pad; 668 } 669 return ret; 670} 671 672int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out) 673{ 674 unsigned int ret; 675 EVP_MD_CTX ctx; 676 677 EVP_MD_CTX_init(&ctx); 678 EVP_MD_CTX_copy_ex(&ctx, in_ctx); 679 EVP_DigestFinal_ex(&ctx, out, &ret); 680 EVP_MD_CTX_cleanup(&ctx); 681 return ((int)ret); 682} 683 684int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx, 685 const char *str, int slen, unsigned char *out) 686{ 687 unsigned int i; 688 EVP_MD_CTX ctx; 689 unsigned char buf[TLS_MD_MAX_CONST_SIZE + MD5_DIGEST_LENGTH + 690 SHA_DIGEST_LENGTH]; 691 unsigned char *q, buf2[12]; 692 693 q = buf; 694 memcpy(q, str, slen); 695 q += slen; 696 697 EVP_MD_CTX_init(&ctx); 698 EVP_MD_CTX_copy_ex(&ctx, in1_ctx); 699 EVP_DigestFinal_ex(&ctx, q, &i); 700 q += i; 701 EVP_MD_CTX_copy_ex(&ctx, in2_ctx); 702 EVP_DigestFinal_ex(&ctx, q, &i); 703 q += i; 704 705 tls1_PRF(s->ctx->md5, s->ctx->sha1, buf, (int)(q - buf), 706 s->session->master_key, s->session->master_key_length, 707 out, buf2, sizeof buf2); 708 EVP_MD_CTX_cleanup(&ctx); 709 710 OPENSSL_cleanse(buf, (int)(q - buf)); 711 OPENSSL_cleanse(buf2, sizeof(buf2)); 712 return sizeof buf2; 713} 714 715int tls1_mac(SSL *ssl, unsigned char *md, int send) 716{ 717 SSL3_RECORD *rec; 718 unsigned char *mac_sec, *seq; 719 const EVP_MD *hash; 720 size_t md_size, orig_len; 721 int i; 722 HMAC_CTX hmac; 723 unsigned char header[13]; 724 725 if (send) { 726 rec = &(ssl->s3->wrec); 727 mac_sec = &(ssl->s3->write_mac_secret[0]); 728 seq = &(ssl->s3->write_sequence[0]); 729 hash = ssl->write_hash; 730 } else { 731 rec = &(ssl->s3->rrec); 732 mac_sec = &(ssl->s3->read_mac_secret[0]); 733 seq = &(ssl->s3->read_sequence[0]); 734 hash = ssl->read_hash; 735 } 736 737 md_size = EVP_MD_size(hash); 738 739 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 740 HMAC_CTX_init(&hmac); 741 HMAC_Init_ex(&hmac, mac_sec, EVP_MD_size(hash), hash, NULL); 742 743 if (ssl->version == DTLS1_BAD_VER || 744 (ssl->version == DTLS1_VERSION 745 && ssl->client_version != DTLS1_BAD_VER)) { 746 unsigned char dtlsseq[8], *p = dtlsseq; 747 s2n(send ? ssl->d1->w_epoch : ssl->d1->r_epoch, p); 748 memcpy(p, &seq[2], 6); 749 750 memcpy(header, dtlsseq, 8); 751 } else 752 memcpy(header, seq, 8); 753 754 /* 755 * kludge: tls1_cbc_remove_padding passes padding length in rec->type 756 */ 757 orig_len = rec->length + md_size + ((unsigned int)rec->type >> 8); 758 rec->type &= 0xff; 759 760 header[8] = rec->type; 761 header[9] = (unsigned char)(ssl->version >> 8); 762 header[10] = (unsigned char)(ssl->version); 763 header[11] = (rec->length) >> 8; 764 header[12] = (rec->length) & 0xff; 765 766 if (!send && 767 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && 768 ssl3_cbc_record_digest_supported(hash)) { 769 /* 770 * This is a CBC-encrypted record. We must avoid leaking any 771 * timing-side channel information about how many blocks of data we 772 * are hashing because that gives an attacker a timing-oracle. 773 */ 774 /* Final param == not SSLv3 */ 775 ssl3_cbc_digest_record(hash, 776 md, &md_size, 777 header, rec->input, 778 rec->length + md_size, orig_len, 779 ssl->s3->read_mac_secret, 780 EVP_MD_size(ssl->read_hash), 781 /* not SSLv3 */ 782 0); 783 } else { 784 unsigned mds; 785 786 HMAC_Update(&hmac, header, sizeof(header)); 787 HMAC_Update(&hmac, rec->input, rec->length); 788 HMAC_Final(&hmac, md, &mds); 789 md_size = mds; 790#ifdef OPENSSL_FIPS 791 if (!send && FIPS_mode()) 792 tls_fips_digest_extra(ssl->enc_read_ctx, 793 hash, 794 &hmac, rec->input, rec->length, orig_len); 795#endif 796 } 797 798 HMAC_CTX_cleanup(&hmac); 799#ifdef TLS_DEBUG 800 printf("seq="); 801 { 802 int z; 803 for (z = 0; z < 8; z++) 804 printf("%02X ", seq[z]); 805 printf("\n"); 806 } 807 printf("rec="); 808 { 809 unsigned int z; 810 for (z = 0; z < rec->length; z++) 811 printf("%02X ", rec->data[z]); 812 printf("\n"); 813 } 814#endif 815 816 if (SSL_version(ssl) != DTLS1_VERSION 817 && SSL_version(ssl) != DTLS1_BAD_VER) { 818 for (i = 7; i >= 0; i--) { 819 ++seq[i]; 820 if (seq[i] != 0) 821 break; 822 } 823 } 824#ifdef TLS_DEBUG 825 { 826 unsigned int z; 827 for (z = 0; z < md_size; z++) 828 printf("%02X ", md[z]); 829 printf("\n"); 830 } 831#endif 832 return (md_size); 833} 834 835int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 836 int len) 837{ 838 unsigned char buf[SSL3_RANDOM_SIZE * 2 + TLS_MD_MASTER_SECRET_CONST_SIZE]; 839 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 840 841#ifdef KSSL_DEBUG 842 printf("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s, out, p, 843 len); 844#endif /* KSSL_DEBUG */ 845 846 /* Setup the stuff to munge */ 847 memcpy(buf, TLS_MD_MASTER_SECRET_CONST, TLS_MD_MASTER_SECRET_CONST_SIZE); 848 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]), 849 s->s3->client_random, SSL3_RANDOM_SIZE); 850 memcpy(&(buf[SSL3_RANDOM_SIZE + TLS_MD_MASTER_SECRET_CONST_SIZE]), 851 s->s3->server_random, SSL3_RANDOM_SIZE); 852 tls1_PRF(s->ctx->md5, s->ctx->sha1, 853 buf, TLS_MD_MASTER_SECRET_CONST_SIZE + SSL3_RANDOM_SIZE * 2, p, 854 len, s->session->master_key, buff, sizeof buff); 855 OPENSSL_cleanse(buf, sizeof buf); 856 OPENSSL_cleanse(buff, sizeof buff); 857#ifdef KSSL_DEBUG 858 printf("tls1_generate_master_secret() complete\n"); 859#endif /* KSSL_DEBUG */ 860 return (SSL3_MASTER_SECRET_SIZE); 861} 862 863int tls1_alert_code(int code) 864{ 865 switch (code) { 866 case SSL_AD_CLOSE_NOTIFY: 867 return (SSL3_AD_CLOSE_NOTIFY); 868 case SSL_AD_UNEXPECTED_MESSAGE: 869 return (SSL3_AD_UNEXPECTED_MESSAGE); 870 case SSL_AD_BAD_RECORD_MAC: 871 return (SSL3_AD_BAD_RECORD_MAC); 872 case SSL_AD_DECRYPTION_FAILED: 873 return (TLS1_AD_DECRYPTION_FAILED); 874 case SSL_AD_RECORD_OVERFLOW: 875 return (TLS1_AD_RECORD_OVERFLOW); 876 case SSL_AD_DECOMPRESSION_FAILURE: 877 return (SSL3_AD_DECOMPRESSION_FAILURE); 878 case SSL_AD_HANDSHAKE_FAILURE: 879 return (SSL3_AD_HANDSHAKE_FAILURE); 880 case SSL_AD_NO_CERTIFICATE: 881 return (-1); 882 case SSL_AD_BAD_CERTIFICATE: 883 return (SSL3_AD_BAD_CERTIFICATE); 884 case SSL_AD_UNSUPPORTED_CERTIFICATE: 885 return (SSL3_AD_UNSUPPORTED_CERTIFICATE); 886 case SSL_AD_CERTIFICATE_REVOKED: 887 return (SSL3_AD_CERTIFICATE_REVOKED); 888 case SSL_AD_CERTIFICATE_EXPIRED: 889 return (SSL3_AD_CERTIFICATE_EXPIRED); 890 case SSL_AD_CERTIFICATE_UNKNOWN: 891 return (SSL3_AD_CERTIFICATE_UNKNOWN); 892 case SSL_AD_ILLEGAL_PARAMETER: 893 return (SSL3_AD_ILLEGAL_PARAMETER); 894 case SSL_AD_UNKNOWN_CA: 895 return (TLS1_AD_UNKNOWN_CA); 896 case SSL_AD_ACCESS_DENIED: 897 return (TLS1_AD_ACCESS_DENIED); 898 case SSL_AD_DECODE_ERROR: 899 return (TLS1_AD_DECODE_ERROR); 900 case SSL_AD_DECRYPT_ERROR: 901 return (TLS1_AD_DECRYPT_ERROR); 902 case SSL_AD_EXPORT_RESTRICTION: 903 return (TLS1_AD_EXPORT_RESTRICTION); 904 case SSL_AD_PROTOCOL_VERSION: 905 return (TLS1_AD_PROTOCOL_VERSION); 906 case SSL_AD_INSUFFICIENT_SECURITY: 907 return (TLS1_AD_INSUFFICIENT_SECURITY); 908 case SSL_AD_INTERNAL_ERROR: 909 return (TLS1_AD_INTERNAL_ERROR); 910 case SSL_AD_USER_CANCELLED: 911 return (TLS1_AD_USER_CANCELLED); 912 case SSL_AD_NO_RENEGOTIATION: 913 return (TLS1_AD_NO_RENEGOTIATION); 914 case SSL_AD_UNSUPPORTED_EXTENSION: 915 return (TLS1_AD_UNSUPPORTED_EXTENSION); 916 case SSL_AD_CERTIFICATE_UNOBTAINABLE: 917 return (TLS1_AD_CERTIFICATE_UNOBTAINABLE); 918 case SSL_AD_UNRECOGNIZED_NAME: 919 return (TLS1_AD_UNRECOGNIZED_NAME); 920 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: 921 return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 922 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: 923 return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 924 case SSL_AD_UNKNOWN_PSK_IDENTITY: 925 return (TLS1_AD_UNKNOWN_PSK_IDENTITY); 926 case SSL_AD_INAPPROPRIATE_FALLBACK: 927 return (TLS1_AD_INAPPROPRIATE_FALLBACK); 928#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 929 case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: 930 return (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 931#endif 932 default: 933 return (-1); 934 } 935} 936