1 /* ssl/s3_enc.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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 #include <openssl/evp.h> 141 #include <openssl/md5.h> 142 143 static unsigned char ssl3_pad_1[48]={ 144 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 145 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 146 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 147 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 148 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 149 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; 150 151 static unsigned char ssl3_pad_2[48]={ 152 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 153 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 154 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 155 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 156 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 157 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; 158 static int ssl3_handshake_mac(SSL *s, int md_nid, 159 const char *sender, int len, unsigned char *p); 160 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) 161 { 162 EVP_MD_CTX m5; 163 EVP_MD_CTX s1; 164 unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; 165 unsigned char c='A'; 166 unsigned int i,j,k; 167 168 #ifdef CHARSET_EBCDIC 169 c = os_toascii[c]; /*'A' in ASCII */ 170 #endif 171 k=0; 172 EVP_MD_CTX_init(&m5); 173 EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 174 EVP_MD_CTX_init(&s1); 175 for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) 176 { 177 k++; 178 if (k > sizeof buf) 179 { 180 /* bug: 'buf' is too small for this ciphersuite */ 181 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); 182 return 0; 183 } 184 185 for (j=0; j<k; j++) 186 buf[j]=c; 187 c++; 188 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); 189 EVP_DigestUpdate(&s1,buf,k); 190 EVP_DigestUpdate(&s1,s->session->master_key, 191 s->session->master_key_length); 192 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); 193 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); 194 EVP_DigestFinal_ex(&s1,smd,NULL); 195 196 EVP_DigestInit_ex(&m5,EVP_md5(), NULL); 197 EVP_DigestUpdate(&m5,s->session->master_key, 198 s->session->master_key_length); 199 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); 200 if ((int)(i+MD5_DIGEST_LENGTH) > num) 201 { 202 EVP_DigestFinal_ex(&m5,smd,NULL); 203 memcpy(km,smd,(num-i)); 204 } 205 else 206 EVP_DigestFinal_ex(&m5,km,NULL); 207 208 km+=MD5_DIGEST_LENGTH; 209 } 210 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); 211 EVP_MD_CTX_cleanup(&m5); 212 EVP_MD_CTX_cleanup(&s1); 213 return 1; 214 } 215 216 int ssl3_change_cipher_state(SSL *s, int which) 217 { 218 unsigned char *p,*mac_secret; 219 unsigned char exp_key[EVP_MAX_KEY_LENGTH]; 220 unsigned char exp_iv[EVP_MAX_IV_LENGTH]; 221 unsigned char *ms,*key,*iv,*er1,*er2; 222 EVP_CIPHER_CTX *dd; 223 const EVP_CIPHER *c; 224 #ifndef OPENSSL_NO_COMP 225 COMP_METHOD *comp; 226 #endif 227 const EVP_MD *m; 228 EVP_MD_CTX md; 229 int is_exp,n,i,j,k,cl; 230 int reuse_dd = 0; 231 232 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 233 c=s->s3->tmp.new_sym_enc; 234 m=s->s3->tmp.new_hash; 235 /* m == NULL will lead to a crash later */ 236 OPENSSL_assert(m); 237 #ifndef OPENSSL_NO_COMP 238 if (s->s3->tmp.new_compression == NULL) 239 comp=NULL; 240 else 241 comp=s->s3->tmp.new_compression->method; 242 #endif 243 244 if (which & SSL3_CC_READ) 245 { 246 if (s->enc_read_ctx != NULL) 247 reuse_dd = 1; 248 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 249 goto err; 250 else 251 /* make sure it's intialized in case we exit later with an error */ 252 EVP_CIPHER_CTX_init(s->enc_read_ctx); 253 dd= s->enc_read_ctx; 254 255 ssl_replace_hash(&s->read_hash,m); 256 #ifndef OPENSSL_NO_COMP 257 /* COMPRESS */ 258 if (s->expand != NULL) 259 { 260 COMP_CTX_free(s->expand); 261 s->expand=NULL; 262 } 263 if (comp != NULL) 264 { 265 s->expand=COMP_CTX_new(comp); 266 if (s->expand == NULL) 267 { 268 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 269 goto err2; 270 } 271 if (s->s3->rrec.comp == NULL) 272 s->s3->rrec.comp=(unsigned char *) 273 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 274 if (s->s3->rrec.comp == NULL) 275 goto err; 276 } 277 #endif 278 memset(&(s->s3->read_sequence[0]),0,8); 279 mac_secret= &(s->s3->read_mac_secret[0]); 280 } 281 else 282 { 283 if (s->enc_write_ctx != NULL) 284 reuse_dd = 1; 285 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 286 goto err; 287 else 288 /* make sure it's intialized in case we exit later with an error */ 289 EVP_CIPHER_CTX_init(s->enc_write_ctx); 290 dd= s->enc_write_ctx; 291 ssl_replace_hash(&s->write_hash,m); 292 #ifndef OPENSSL_NO_COMP 293 /* COMPRESS */ 294 if (s->compress != NULL) 295 { 296 COMP_CTX_free(s->compress); 297 s->compress=NULL; 298 } 299 if (comp != NULL) 300 { 301 s->compress=COMP_CTX_new(comp); 302 if (s->compress == NULL) 303 { 304 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 305 goto err2; 306 } 307 } 308 #endif 309 memset(&(s->s3->write_sequence[0]),0,8); 310 mac_secret= &(s->s3->write_mac_secret[0]); 311 } 312 313 if (reuse_dd) 314 EVP_CIPHER_CTX_cleanup(dd); 315 316 p=s->s3->tmp.key_block; 317 i=EVP_MD_size(m); 318 if (i < 0) 319 goto err2; 320 cl=EVP_CIPHER_key_length(c); 321 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 322 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 323 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 324 k=EVP_CIPHER_iv_length(c); 325 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 326 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 327 { 328 ms= &(p[ 0]); n=i+i; 329 key= &(p[ n]); n+=j+j; 330 iv= &(p[ n]); n+=k+k; 331 er1= &(s->s3->client_random[0]); 332 er2= &(s->s3->server_random[0]); 333 } 334 else 335 { 336 n=i; 337 ms= &(p[ n]); n+=i+j; 338 key= &(p[ n]); n+=j+k; 339 iv= &(p[ n]); n+=k; 340 er1= &(s->s3->server_random[0]); 341 er2= &(s->s3->client_random[0]); 342 } 343 344 if (n > s->s3->tmp.key_block_length) 345 { 346 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 347 goto err2; 348 } 349 350 EVP_MD_CTX_init(&md); 351 memcpy(mac_secret,ms,i); 352 if (is_exp) 353 { 354 /* In here I set both the read and write key/iv to the 355 * same value since only the correct one will be used :-). 356 */ 357 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 358 EVP_DigestUpdate(&md,key,j); 359 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 360 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 361 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 362 key= &(exp_key[0]); 363 364 if (k > 0) 365 { 366 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 367 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 368 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 369 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 370 iv= &(exp_iv[0]); 371 } 372 } 373 374 s->session->key_arg_length=0; 375 376 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 377 378 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 379 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 380 EVP_MD_CTX_cleanup(&md); 381 return(1); 382 err: 383 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 384 err2: 385 return(0); 386 } 387 388 int ssl3_setup_key_block(SSL *s) 389 { 390 unsigned char *p; 391 const EVP_CIPHER *c; 392 const EVP_MD *hash; 393 int num; 394 int ret = 0; 395 SSL_COMP *comp; 396 397 if (s->s3->tmp.key_block_length != 0) 398 return(1); 399 400 if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp)) 401 { 402 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 403 return(0); 404 } 405 406 s->s3->tmp.new_sym_enc=c; 407 s->s3->tmp.new_hash=hash; 408 #ifdef OPENSSL_NO_COMP 409 s->s3->tmp.new_compression=NULL; 410 #else 411 s->s3->tmp.new_compression=comp; 412 #endif 413 414 num=EVP_MD_size(hash); 415 if (num < 0) 416 return 0; 417 418 num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c); 419 num*=2; 420 421 ssl3_cleanup_key_block(s); 422 423 if ((p=OPENSSL_malloc(num)) == NULL) 424 goto err; 425 426 s->s3->tmp.key_block_length=num; 427 s->s3->tmp.key_block=p; 428 429 ret = ssl3_generate_key_block(s,p,num); 430 431 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 432 { 433 /* enable vulnerability countermeasure for CBC ciphers with 434 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 435 */ 436 s->s3->need_empty_fragments = 1; 437 438 if (s->session->cipher != NULL) 439 { 440 if (s->session->cipher->algorithm_enc == SSL_eNULL) 441 s->s3->need_empty_fragments = 0; 442 443 #ifndef OPENSSL_NO_RC4 444 if (s->session->cipher->algorithm_enc == SSL_RC4) 445 s->s3->need_empty_fragments = 0; 446 #endif 447 } 448 } 449 450 return ret; 451 452 err: 453 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 454 return(0); 455 } 456 457 void ssl3_cleanup_key_block(SSL *s) 458 { 459 if (s->s3->tmp.key_block != NULL) 460 { 461 OPENSSL_cleanse(s->s3->tmp.key_block, 462 s->s3->tmp.key_block_length); 463 OPENSSL_free(s->s3->tmp.key_block); 464 s->s3->tmp.key_block=NULL; 465 } 466 s->s3->tmp.key_block_length=0; 467 } 468 469 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. 470 * 471 * Returns: 472 * 0: (in non-constant time) if the record is publically invalid (i.e. too 473 * short etc). 474 * 1: if the record's padding is valid / the encryption was successful. 475 * -1: if the record's padding is invalid or, if sending, an internal error 476 * occured. 477 */ 478 int ssl3_enc(SSL *s, int send) 479 { 480 SSL3_RECORD *rec; 481 EVP_CIPHER_CTX *ds; 482 unsigned long l; 483 int bs,i,mac_size=0; 484 const EVP_CIPHER *enc; 485 486 if (send) 487 { 488 ds=s->enc_write_ctx; 489 rec= &(s->s3->wrec); 490 if (s->enc_write_ctx == NULL) 491 enc=NULL; 492 else 493 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 494 } 495 else 496 { 497 ds=s->enc_read_ctx; 498 rec= &(s->s3->rrec); 499 if (s->enc_read_ctx == NULL) 500 enc=NULL; 501 else 502 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 503 } 504 505 if ((s->session == NULL) || (ds == NULL) || 506 (enc == NULL)) 507 { 508 memmove(rec->data,rec->input,rec->length); 509 rec->input=rec->data; 510 } 511 else 512 { 513 l=rec->length; 514 bs=EVP_CIPHER_block_size(ds->cipher); 515 516 /* COMPRESS */ 517 518 if ((bs != 1) && send) 519 { 520 i=bs-((int)l%bs); 521 522 /* we need to add 'i-1' padding bytes */ 523 l+=i; 524 /* the last of these zero bytes will be overwritten 525 * with the padding length. */ 526 memset(&rec->input[rec->length], 0, i); 527 rec->length+=i; 528 rec->input[l-1]=(i-1); 529 } 530 531 if (!send) 532 { 533 if (l == 0 || l%bs != 0) 534 return 0; 535 /* otherwise, rec->length >= bs */ 536 } 537 538 EVP_Cipher(ds,rec->data,rec->input,l); 539 540 if (EVP_MD_CTX_md(s->read_hash) != NULL) 541 mac_size = EVP_MD_CTX_size(s->read_hash); 542 if ((bs != 1) && !send) 543 return ssl3_cbc_remove_padding(s, rec, bs, mac_size); 544 } 545 return(1); 546 } 547 548 void ssl3_init_finished_mac(SSL *s) 549 { 550 if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); 551 if (s->s3->handshake_dgst) ssl3_free_digest_list(s); 552 s->s3->handshake_buffer=BIO_new(BIO_s_mem()); 553 (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); 554 } 555 556 void ssl3_free_digest_list(SSL *s) 557 { 558 int i; 559 if (!s->s3->handshake_dgst) return; 560 for (i=0;i<SSL_MAX_DIGEST;i++) 561 { 562 if (s->s3->handshake_dgst[i]) 563 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); 564 } 565 OPENSSL_free(s->s3->handshake_dgst); 566 s->s3->handshake_dgst=NULL; 567 } 568 569 570 571 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 572 { 573 if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) 574 { 575 BIO_write (s->s3->handshake_buffer,(void *)buf,len); 576 } 577 else 578 { 579 int i; 580 for (i=0;i< SSL_MAX_DIGEST;i++) 581 { 582 if (s->s3->handshake_dgst[i]!= NULL) 583 EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); 584 } 585 } 586 } 587 588 int ssl3_digest_cached_records(SSL *s) 589 { 590 int i; 591 long mask; 592 const EVP_MD *md; 593 long hdatalen; 594 void *hdata; 595 596 /* Allocate handshake_dgst array */ 597 ssl3_free_digest_list(s); 598 s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); 599 memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); 600 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata); 601 if (hdatalen <= 0) 602 { 603 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); 604 return 0; 605 } 606 607 /* Loop through bitso of algorithm2 field and create MD_CTX-es */ 608 for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 609 { 610 if ((mask & ssl_get_algorithm2(s)) && md) 611 { 612 s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); 613 #ifdef OPENSSL_FIPS 614 if (EVP_MD_nid(md) == NID_md5) 615 { 616 EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i], 617 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 618 } 619 #endif 620 EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); 621 EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); 622 } 623 else 624 { 625 s->s3->handshake_dgst[i]=NULL; 626 } 627 } 628 if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) 629 { 630 /* Free handshake_buffer BIO */ 631 BIO_free(s->s3->handshake_buffer); 632 s->s3->handshake_buffer = NULL; 633 } 634 635 return 1; 636 } 637 638 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) 639 { 640 return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); 641 } 642 int ssl3_final_finish_mac(SSL *s, 643 const char *sender, int len, unsigned char *p) 644 { 645 int ret; 646 ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); 647 p+=ret; 648 ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p); 649 return(ret); 650 } 651 static int ssl3_handshake_mac(SSL *s, int md_nid, 652 const char *sender, int len, unsigned char *p) 653 { 654 unsigned int ret; 655 int npad,n; 656 unsigned int i; 657 unsigned char md_buf[EVP_MAX_MD_SIZE]; 658 EVP_MD_CTX ctx,*d=NULL; 659 660 if (s->s3->handshake_buffer) 661 if (!ssl3_digest_cached_records(s)) 662 return 0; 663 664 /* Search for digest of specified type in the handshake_dgst 665 * array*/ 666 for (i=0;i<SSL_MAX_DIGEST;i++) 667 { 668 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 669 { 670 d=s->s3->handshake_dgst[i]; 671 break; 672 } 673 } 674 if (!d) { 675 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST); 676 return 0; 677 } 678 EVP_MD_CTX_init(&ctx); 679 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 680 EVP_MD_CTX_copy_ex(&ctx,d); 681 n=EVP_MD_CTX_size(&ctx); 682 if (n < 0) 683 return 0; 684 685 npad=(48/n)*n; 686 if (sender != NULL) 687 EVP_DigestUpdate(&ctx,sender,len); 688 EVP_DigestUpdate(&ctx,s->session->master_key, 689 s->session->master_key_length); 690 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 691 EVP_DigestFinal_ex(&ctx,md_buf,&i); 692 693 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 694 EVP_DigestUpdate(&ctx,s->session->master_key, 695 s->session->master_key_length); 696 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 697 EVP_DigestUpdate(&ctx,md_buf,i); 698 EVP_DigestFinal_ex(&ctx,p,&ret); 699 700 EVP_MD_CTX_cleanup(&ctx); 701 702 return((int)ret); 703 } 704 705 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) 706 { 707 SSL3_RECORD *rec; 708 unsigned char *mac_sec,*seq; 709 EVP_MD_CTX md_ctx; 710 const EVP_MD_CTX *hash; 711 unsigned char *p,rec_char; 712 size_t md_size, orig_len; 713 int npad; 714 int t; 715 716 if (send) 717 { 718 rec= &(ssl->s3->wrec); 719 mac_sec= &(ssl->s3->write_mac_secret[0]); 720 seq= &(ssl->s3->write_sequence[0]); 721 hash=ssl->write_hash; 722 } 723 else 724 { 725 rec= &(ssl->s3->rrec); 726 mac_sec= &(ssl->s3->read_mac_secret[0]); 727 seq= &(ssl->s3->read_sequence[0]); 728 hash=ssl->read_hash; 729 } 730 731 t=EVP_MD_CTX_size(hash); 732 if (t < 0) 733 return -1; 734 md_size=t; 735 npad=(48/md_size)*md_size; 736 737 /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */ 738 orig_len = rec->length+md_size+((unsigned int)rec->type>>8); 739 rec->type &= 0xff; 740 741 if (!send && 742 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && 743 ssl3_cbc_record_digest_supported(hash)) 744 { 745 /* This is a CBC-encrypted record. We must avoid leaking any 746 * timing-side channel information about how many blocks of 747 * data we are hashing because that gives an attacker a 748 * timing-oracle. */ 749 750 /* npad is, at most, 48 bytes and that's with MD5: 751 * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. 752 * 753 * With SHA-1 (the largest hash speced for SSLv3) the hash size 754 * goes up 4, but npad goes down by 8, resulting in a smaller 755 * total size. */ 756 unsigned char header[75]; 757 unsigned j = 0; 758 memcpy(header+j, mac_sec, md_size); 759 j += md_size; 760 memcpy(header+j, ssl3_pad_1, npad); 761 j += npad; 762 memcpy(header+j, seq, 8); 763 j += 8; 764 header[j++] = rec->type; 765 header[j++] = rec->length >> 8; 766 header[j++] = rec->length & 0xff; 767 768 ssl3_cbc_digest_record( 769 hash, 770 md, &md_size, 771 header, rec->input, 772 rec->length + md_size, orig_len, 773 mac_sec, md_size, 774 1 /* is SSLv3 */); 775 } 776 else 777 { 778 unsigned int md_size_u; 779 /* Chop the digest off the end :-) */ 780 EVP_MD_CTX_init(&md_ctx); 781 782 EVP_MD_CTX_copy_ex( &md_ctx,hash); 783 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 784 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 785 EVP_DigestUpdate(&md_ctx,seq,8); 786 rec_char=rec->type; 787 EVP_DigestUpdate(&md_ctx,&rec_char,1); 788 p=md; 789 s2n(rec->length,p); 790 EVP_DigestUpdate(&md_ctx,md,2); 791 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 792 EVP_DigestFinal_ex( &md_ctx,md,NULL); 793 794 EVP_MD_CTX_copy_ex( &md_ctx,hash); 795 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 796 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 797 EVP_DigestUpdate(&md_ctx,md,md_size); 798 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u); 799 md_size = md_size_u; 800 801 EVP_MD_CTX_cleanup(&md_ctx); 802 } 803 804 ssl3_record_sequence_update(seq); 805 return(md_size); 806 } 807 808 void ssl3_record_sequence_update(unsigned char *seq) 809 { 810 int i; 811 812 for (i=7; i>=0; i--) 813 { 814 ++seq[i]; 815 if (seq[i] != 0) break; 816 } 817 } 818 819 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 820 int len) 821 { 822 static const unsigned char *salt[3]={ 823 #ifndef CHARSET_EBCDIC 824 (const unsigned char *)"A", 825 (const unsigned char *)"BB", 826 (const unsigned char *)"CCC", 827 #else 828 (const unsigned char *)"\x41", 829 (const unsigned char *)"\x42\x42", 830 (const unsigned char *)"\x43\x43\x43", 831 #endif 832 }; 833 unsigned char buf[EVP_MAX_MD_SIZE]; 834 EVP_MD_CTX ctx; 835 int i,ret=0; 836 unsigned int n; 837 838 EVP_MD_CTX_init(&ctx); 839 for (i=0; i<3; i++) 840 { 841 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 842 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 843 EVP_DigestUpdate(&ctx,p,len); 844 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 845 SSL3_RANDOM_SIZE); 846 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 847 SSL3_RANDOM_SIZE); 848 EVP_DigestFinal_ex(&ctx,buf,&n); 849 850 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 851 EVP_DigestUpdate(&ctx,p,len); 852 EVP_DigestUpdate(&ctx,buf,n); 853 EVP_DigestFinal_ex(&ctx,out,&n); 854 out+=n; 855 ret+=n; 856 } 857 EVP_MD_CTX_cleanup(&ctx); 858 return(ret); 859 } 860 861 int ssl3_alert_code(int code) 862 { 863 switch (code) 864 { 865 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 866 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 867 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 868 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 869 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 870 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 871 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 872 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 873 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 874 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 875 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 876 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 877 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 878 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 879 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 880 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 881 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 882 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 883 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 884 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 885 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 886 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 887 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 888 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 889 case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); 890 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); 891 case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); 892 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); 893 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); 894 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 895 default: return(-1); 896 } 897 } 898 899
