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_init(&s1); 174 for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) 175 { 176 k++; 177 if (k > sizeof buf) 178 { 179 /* bug: 'buf' is too small for this ciphersuite */ 180 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); 181 return 0; 182 } 183 184 for (j=0; j<k; j++) 185 buf[j]=c; 186 c++; 187 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); 188 EVP_DigestUpdate(&s1,buf,k); 189 EVP_DigestUpdate(&s1,s->session->master_key, 190 s->session->master_key_length); 191 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); 192 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); 193 EVP_DigestFinal_ex(&s1,smd,NULL); 194 195 EVP_DigestInit_ex(&m5,EVP_md5(), NULL); 196 EVP_DigestUpdate(&m5,s->session->master_key, 197 s->session->master_key_length); 198 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); 199 if ((int)(i+MD5_DIGEST_LENGTH) > num) 200 { 201 EVP_DigestFinal_ex(&m5,smd,NULL); 202 memcpy(km,smd,(num-i)); 203 } 204 else 205 EVP_DigestFinal_ex(&m5,km,NULL); 206 207 km+=MD5_DIGEST_LENGTH; 208 } 209 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); 210 EVP_MD_CTX_cleanup(&m5); 211 EVP_MD_CTX_cleanup(&s1); 212 return 1; 213 } 214 215 int ssl3_change_cipher_state(SSL *s, int which) 216 { 217 unsigned char *p,*mac_secret; 218 unsigned char exp_key[EVP_MAX_KEY_LENGTH]; 219 unsigned char exp_iv[EVP_MAX_IV_LENGTH]; 220 unsigned char *ms,*key,*iv,*er1,*er2; 221 EVP_CIPHER_CTX *dd; 222 const EVP_CIPHER *c; 223 #ifndef OPENSSL_NO_COMP 224 COMP_METHOD *comp; 225 #endif 226 const EVP_MD *m; 227 EVP_MD_CTX md; 228 int is_exp,n,i,j,k,cl; 229 int reuse_dd = 0; 230 231 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 232 c=s->s3->tmp.new_sym_enc; 233 m=s->s3->tmp.new_hash; 234 /* m == NULL will lead to a crash later */ 235 OPENSSL_assert(m); 236 #ifndef OPENSSL_NO_COMP 237 if (s->s3->tmp.new_compression == NULL) 238 comp=NULL; 239 else 240 comp=s->s3->tmp.new_compression->method; 241 #endif 242 243 if (which & SSL3_CC_READ) 244 { 245 if (s->enc_read_ctx != NULL) 246 reuse_dd = 1; 247 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 248 goto err; 249 else 250 /* make sure it's intialized in case we exit later with an error */ 251 EVP_CIPHER_CTX_init(s->enc_read_ctx); 252 dd= s->enc_read_ctx; 253 254 ssl_replace_hash(&s->read_hash,m); 255 #ifndef OPENSSL_NO_COMP 256 /* COMPRESS */ 257 if (s->expand != NULL) 258 { 259 COMP_CTX_free(s->expand); 260 s->expand=NULL; 261 } 262 if (comp != NULL) 263 { 264 s->expand=COMP_CTX_new(comp); 265 if (s->expand == NULL) 266 { 267 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 268 goto err2; 269 } 270 if (s->s3->rrec.comp == NULL) 271 s->s3->rrec.comp=(unsigned char *) 272 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 273 if (s->s3->rrec.comp == NULL) 274 goto err; 275 } 276 #endif 277 memset(&(s->s3->read_sequence[0]),0,8); 278 mac_secret= &(s->s3->read_mac_secret[0]); 279 } 280 else 281 { 282 if (s->enc_write_ctx != NULL) 283 reuse_dd = 1; 284 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 285 goto err; 286 else 287 /* make sure it's intialized in case we exit later with an error */ 288 EVP_CIPHER_CTX_init(s->enc_write_ctx); 289 dd= s->enc_write_ctx; 290 ssl_replace_hash(&s->write_hash,m); 291 #ifndef OPENSSL_NO_COMP 292 /* COMPRESS */ 293 if (s->compress != NULL) 294 { 295 COMP_CTX_free(s->compress); 296 s->compress=NULL; 297 } 298 if (comp != NULL) 299 { 300 s->compress=COMP_CTX_new(comp); 301 if (s->compress == NULL) 302 { 303 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 304 goto err2; 305 } 306 } 307 #endif 308 memset(&(s->s3->write_sequence[0]),0,8); 309 mac_secret= &(s->s3->write_mac_secret[0]); 310 } 311 312 if (reuse_dd) 313 EVP_CIPHER_CTX_cleanup(dd); 314 315 p=s->s3->tmp.key_block; 316 i=EVP_MD_size(m); 317 if (i < 0) 318 goto err2; 319 cl=EVP_CIPHER_key_length(c); 320 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 321 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 322 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 323 k=EVP_CIPHER_iv_length(c); 324 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 325 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 326 { 327 ms= &(p[ 0]); n=i+i; 328 key= &(p[ n]); n+=j+j; 329 iv= &(p[ n]); n+=k+k; 330 er1= &(s->s3->client_random[0]); 331 er2= &(s->s3->server_random[0]); 332 } 333 else 334 { 335 n=i; 336 ms= &(p[ n]); n+=i+j; 337 key= &(p[ n]); n+=j+k; 338 iv= &(p[ n]); n+=k; 339 er1= &(s->s3->server_random[0]); 340 er2= &(s->s3->client_random[0]); 341 } 342 343 if (n > s->s3->tmp.key_block_length) 344 { 345 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 346 goto err2; 347 } 348 349 EVP_MD_CTX_init(&md); 350 memcpy(mac_secret,ms,i); 351 if (is_exp) 352 { 353 /* In here I set both the read and write key/iv to the 354 * same value since only the correct one will be used :-). 355 */ 356 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 357 EVP_DigestUpdate(&md,key,j); 358 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 359 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 360 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 361 key= &(exp_key[0]); 362 363 if (k > 0) 364 { 365 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 366 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 367 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 368 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 369 iv= &(exp_iv[0]); 370 } 371 } 372 373 s->session->key_arg_length=0; 374 375 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 376 377 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 378 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 379 EVP_MD_CTX_cleanup(&md); 380 return(1); 381 err: 382 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 383 err2: 384 return(0); 385 } 386 387 int ssl3_setup_key_block(SSL *s) 388 { 389 unsigned char *p; 390 const EVP_CIPHER *c; 391 const EVP_MD *hash; 392 int num; 393 int ret = 0; 394 SSL_COMP *comp; 395 396 if (s->s3->tmp.key_block_length != 0) 397 return(1); 398 399 if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp)) 400 { 401 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 402 return(0); 403 } 404 405 s->s3->tmp.new_sym_enc=c; 406 s->s3->tmp.new_hash=hash; 407 #ifdef OPENSSL_NO_COMP 408 s->s3->tmp.new_compression=NULL; 409 #else 410 s->s3->tmp.new_compression=comp; 411 #endif 412 413 num=EVP_MD_size(hash); 414 if (num < 0) 415 return 0; 416 417 num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c); 418 num*=2; 419 420 ssl3_cleanup_key_block(s); 421 422 if ((p=OPENSSL_malloc(num)) == NULL) 423 goto err; 424 425 s->s3->tmp.key_block_length=num; 426 s->s3->tmp.key_block=p; 427 428 ret = ssl3_generate_key_block(s,p,num); 429 430 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 431 { 432 /* enable vulnerability countermeasure for CBC ciphers with 433 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 434 */ 435 s->s3->need_empty_fragments = 1; 436 437 if (s->session->cipher != NULL) 438 { 439 if (s->session->cipher->algorithm_enc == SSL_eNULL) 440 s->s3->need_empty_fragments = 0; 441 442 #ifndef OPENSSL_NO_RC4 443 if (s->session->cipher->algorithm_enc == SSL_RC4) 444 s->s3->need_empty_fragments = 0; 445 #endif 446 } 447 } 448 449 return ret; 450 451 err: 452 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 453 return(0); 454 } 455 456 void ssl3_cleanup_key_block(SSL *s) 457 { 458 if (s->s3->tmp.key_block != NULL) 459 { 460 OPENSSL_cleanse(s->s3->tmp.key_block, 461 s->s3->tmp.key_block_length); 462 OPENSSL_free(s->s3->tmp.key_block); 463 s->s3->tmp.key_block=NULL; 464 } 465 s->s3->tmp.key_block_length=0; 466 } 467 468 int ssl3_enc(SSL *s, int send) 469 { 470 SSL3_RECORD *rec; 471 EVP_CIPHER_CTX *ds; 472 unsigned long l; 473 int bs,i; 474 const EVP_CIPHER *enc; 475 476 if (send) 477 { 478 ds=s->enc_write_ctx; 479 rec= &(s->s3->wrec); 480 if (s->enc_write_ctx == NULL) 481 enc=NULL; 482 else 483 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 484 } 485 else 486 { 487 ds=s->enc_read_ctx; 488 rec= &(s->s3->rrec); 489 if (s->enc_read_ctx == NULL) 490 enc=NULL; 491 else 492 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 493 } 494 495 if ((s->session == NULL) || (ds == NULL) || 496 (enc == NULL)) 497 { 498 memmove(rec->data,rec->input,rec->length); 499 rec->input=rec->data; 500 } 501 else 502 { 503 l=rec->length; 504 bs=EVP_CIPHER_block_size(ds->cipher); 505 506 /* COMPRESS */ 507 508 if ((bs != 1) && send) 509 { 510 i=bs-((int)l%bs); 511 512 /* we need to add 'i-1' padding bytes */ 513 l+=i; 514 /* the last of these zero bytes will be overwritten 515 * with the padding length. */ 516 memset(&rec->input[rec->length], 0, i); 517 rec->length+=i; 518 rec->input[l-1]=(i-1); 519 } 520 521 if (!send) 522 { 523 if (l == 0 || l%bs != 0) 524 { 525 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 526 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 527 return 0; 528 } 529 /* otherwise, rec->length >= bs */ 530 } 531 532 EVP_Cipher(ds,rec->data,rec->input,l); 533 534 if ((bs != 1) && !send) 535 { 536 i=rec->data[l-1]+1; 537 /* SSL 3.0 bounds the number of padding bytes by the block size; 538 * padding bytes (except the last one) are arbitrary */ 539 if (i > bs) 540 { 541 /* Incorrect padding. SSLerr() and ssl3_alert are done 542 * by caller: we don't want to reveal whether this is 543 * a decryption error or a MAC verification failure 544 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 545 return -1; 546 } 547 /* now i <= bs <= rec->length */ 548 rec->length-=i; 549 } 550 } 551 return(1); 552 } 553 554 void ssl3_init_finished_mac(SSL *s) 555 { 556 if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); 557 if (s->s3->handshake_dgst) ssl3_free_digest_list(s); 558 s->s3->handshake_buffer=BIO_new(BIO_s_mem()); 559 (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); 560 } 561 562 void ssl3_free_digest_list(SSL *s) 563 { 564 int i; 565 if (!s->s3->handshake_dgst) return; 566 for (i=0;i<SSL_MAX_DIGEST;i++) 567 { 568 if (s->s3->handshake_dgst[i]) 569 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); 570 } 571 OPENSSL_free(s->s3->handshake_dgst); 572 s->s3->handshake_dgst=NULL; 573 } 574 575 576 577 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 578 { 579 if (s->s3->handshake_buffer) 580 { 581 BIO_write (s->s3->handshake_buffer,(void *)buf,len); 582 } 583 else 584 { 585 int i; 586 for (i=0;i< SSL_MAX_DIGEST;i++) 587 { 588 if (s->s3->handshake_dgst[i]!= NULL) 589 EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); 590 } 591 } 592 } 593 594 int ssl3_digest_cached_records(SSL *s) 595 { 596 int i; 597 long mask; 598 const EVP_MD *md; 599 long hdatalen; 600 void *hdata; 601 602 /* Allocate handshake_dgst array */ 603 ssl3_free_digest_list(s); 604 s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); 605 memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); 606 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata); 607 if (hdatalen <= 0) 608 { 609 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); 610 return 0; 611 } 612 613 /* Loop through bitso of algorithm2 field and create MD_CTX-es */ 614 for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 615 { 616 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md) 617 { 618 s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); 619 EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); 620 EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); 621 } 622 else 623 { 624 s->s3->handshake_dgst[i]=NULL; 625 } 626 } 627 /* Free handshake_buffer BIO */ 628 BIO_free(s->s3->handshake_buffer); 629 s->s3->handshake_buffer = NULL; 630 631 return 1; 632 } 633 634 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) 635 { 636 return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); 637 } 638 int ssl3_final_finish_mac(SSL *s, 639 const char *sender, int len, unsigned char *p) 640 { 641 int ret; 642 ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); 643 p+=ret; 644 ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p); 645 return(ret); 646 } 647 static int ssl3_handshake_mac(SSL *s, int md_nid, 648 const char *sender, int len, unsigned char *p) 649 { 650 unsigned int ret; 651 int npad,n; 652 unsigned int i; 653 unsigned char md_buf[EVP_MAX_MD_SIZE]; 654 EVP_MD_CTX ctx,*d=NULL; 655 656 if (s->s3->handshake_buffer) 657 if (!ssl3_digest_cached_records(s)) 658 return 0; 659 660 /* Search for digest of specified type in the handshake_dgst 661 * array*/ 662 for (i=0;i<SSL_MAX_DIGEST;i++) 663 { 664 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 665 { 666 d=s->s3->handshake_dgst[i]; 667 break; 668 } 669 } 670 if (!d) { 671 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST); 672 return 0; 673 } 674 EVP_MD_CTX_init(&ctx); 675 EVP_MD_CTX_copy_ex(&ctx,d); 676 n=EVP_MD_CTX_size(&ctx); 677 if (n < 0) 678 return 0; 679 680 npad=(48/n)*n; 681 if (sender != NULL) 682 EVP_DigestUpdate(&ctx,sender,len); 683 EVP_DigestUpdate(&ctx,s->session->master_key, 684 s->session->master_key_length); 685 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 686 EVP_DigestFinal_ex(&ctx,md_buf,&i); 687 688 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 689 EVP_DigestUpdate(&ctx,s->session->master_key, 690 s->session->master_key_length); 691 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 692 EVP_DigestUpdate(&ctx,md_buf,i); 693 EVP_DigestFinal_ex(&ctx,p,&ret); 694 695 EVP_MD_CTX_cleanup(&ctx); 696 697 return((int)ret); 698 } 699 700 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) 701 { 702 SSL3_RECORD *rec; 703 unsigned char *mac_sec,*seq; 704 EVP_MD_CTX md_ctx; 705 const EVP_MD_CTX *hash; 706 unsigned char *p,rec_char; 707 unsigned int md_size; 708 int npad; 709 int t; 710 711 if (send) 712 { 713 rec= &(ssl->s3->wrec); 714 mac_sec= &(ssl->s3->write_mac_secret[0]); 715 seq= &(ssl->s3->write_sequence[0]); 716 hash=ssl->write_hash; 717 } 718 else 719 { 720 rec= &(ssl->s3->rrec); 721 mac_sec= &(ssl->s3->read_mac_secret[0]); 722 seq= &(ssl->s3->read_sequence[0]); 723 hash=ssl->read_hash; 724 } 725 726 t=EVP_MD_CTX_size(hash); 727 if (t < 0) 728 return -1; 729 md_size=t; 730 npad=(48/md_size)*md_size; 731 732 /* Chop the digest off the end :-) */ 733 EVP_MD_CTX_init(&md_ctx); 734 735 EVP_MD_CTX_copy_ex( &md_ctx,hash); 736 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 737 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 738 EVP_DigestUpdate(&md_ctx,seq,8); 739 rec_char=rec->type; 740 EVP_DigestUpdate(&md_ctx,&rec_char,1); 741 p=md; 742 s2n(rec->length,p); 743 EVP_DigestUpdate(&md_ctx,md,2); 744 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 745 EVP_DigestFinal_ex( &md_ctx,md,NULL); 746 747 EVP_MD_CTX_copy_ex( &md_ctx,hash); 748 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 749 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 750 EVP_DigestUpdate(&md_ctx,md,md_size); 751 EVP_DigestFinal_ex( &md_ctx,md,&md_size); 752 753 EVP_MD_CTX_cleanup(&md_ctx); 754 755 ssl3_record_sequence_update(seq); 756 return(md_size); 757 } 758 759 void ssl3_record_sequence_update(unsigned char *seq) 760 { 761 int i; 762 763 for (i=7; i>=0; i--) 764 { 765 ++seq[i]; 766 if (seq[i] != 0) break; 767 } 768 } 769 770 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 771 int len) 772 { 773 static const unsigned char *salt[3]={ 774 #ifndef CHARSET_EBCDIC 775 (const unsigned char *)"A", 776 (const unsigned char *)"BB", 777 (const unsigned char *)"CCC", 778 #else 779 (const unsigned char *)"\x41", 780 (const unsigned char *)"\x42\x42", 781 (const unsigned char *)"\x43\x43\x43", 782 #endif 783 }; 784 unsigned char buf[EVP_MAX_MD_SIZE]; 785 EVP_MD_CTX ctx; 786 int i,ret=0; 787 unsigned int n; 788 789 EVP_MD_CTX_init(&ctx); 790 for (i=0; i<3; i++) 791 { 792 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 793 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 794 EVP_DigestUpdate(&ctx,p,len); 795 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 796 SSL3_RANDOM_SIZE); 797 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 798 SSL3_RANDOM_SIZE); 799 EVP_DigestFinal_ex(&ctx,buf,&n); 800 801 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 802 EVP_DigestUpdate(&ctx,p,len); 803 EVP_DigestUpdate(&ctx,buf,n); 804 EVP_DigestFinal_ex(&ctx,out,&n); 805 out+=n; 806 ret+=n; 807 } 808 EVP_MD_CTX_cleanup(&ctx); 809 return(ret); 810 } 811 812 int ssl3_alert_code(int code) 813 { 814 switch (code) 815 { 816 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 817 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 818 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 819 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 820 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 821 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 822 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 823 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 824 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 825 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 826 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 827 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 828 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 829 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 830 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 831 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 832 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 833 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 834 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 835 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 836 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 837 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 838 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 839 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 840 case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); 841 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); 842 case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); 843 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); 844 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); 845 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 846 default: return(-1); 847 } 848 } 849 850
