1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 *g 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 *g 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 *g 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) fromg 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 *g 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 *g 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer.g 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2005 Nokia. All rights reserved. 112 * 113 * The portions of the attached software ("Contribution") is developed by 114 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 115 * license. 116 * 117 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 118 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 119 * support (see RFC 4279) to OpenSSL. 120 * 121 * No patent licenses or other rights except those expressly stated in 122 * the OpenSSL open source license shall be deemed granted or received 123 * expressly, by implication, estoppel, or otherwise. 124 * 125 * No assurances are provided by Nokia that the Contribution does not 126 * infringe the patent or other intellectual property rights of any third 127 * party or that the license provides you with all the necessary rights 128 * to make use of the Contribution. 129 * 130 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 131 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 132 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 133 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 134 * OTHERWISE. */ 135 136 #include <stdio.h> 137 #include <assert.h> 138 139 #include <openssl/err.h> 140 #include <openssl/evp.h> 141 #include <openssl/mem.h> 142 #include <openssl/md5.h> 143 #include <openssl/obj.h> 144 145 #include "ssl_locl.h" 146 147 static const uint8_t ssl3_pad_1[48]={ 148 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 149 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 150 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 151 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 152 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 153 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; 154 155 static const uint8_t ssl3_pad_2[48]={ 156 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 157 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 158 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 159 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 160 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 161 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; 162 static int ssl3_handshake_mac(SSL *s, int md_nid, 163 const char *sender, int len, unsigned char *p); 164 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) 165 { 166 EVP_MD_CTX m5; 167 EVP_MD_CTX s1; 168 unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; 169 unsigned char c='A'; 170 unsigned int i,j,k; 171 172 k=0; 173 EVP_MD_CTX_init(&m5); 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 OPENSSL_PUT_ERROR(SSL, 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; 222 EVP_CIPHER_CTX *dd; 223 const EVP_CIPHER *c; 224 const EVP_MD *m; 225 int n,i,j,k,cl; 226 int reuse_dd = 0; 227 228 c=s->s3->tmp.new_sym_enc; 229 m=s->s3->tmp.new_hash; 230 /* m == NULL will lead to a crash later */ 231 assert(m); 232 233 if (which & SSL3_CC_READ) 234 { 235 if (s->enc_read_ctx != NULL) 236 reuse_dd = 1; 237 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 238 goto err; 239 else 240 /* make sure it's intialized in case we exit later with an error */ 241 EVP_CIPHER_CTX_init(s->enc_read_ctx); 242 dd= s->enc_read_ctx; 243 244 ssl_replace_hash(&s->read_hash,m); 245 memset(&(s->s3->read_sequence[0]),0,8); 246 mac_secret= &(s->s3->read_mac_secret[0]); 247 } 248 else 249 { 250 if (s->enc_write_ctx != NULL) 251 reuse_dd = 1; 252 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 253 goto err; 254 else 255 /* make sure it's intialized in case we exit later with an error */ 256 EVP_CIPHER_CTX_init(s->enc_write_ctx); 257 dd= s->enc_write_ctx; 258 ssl_replace_hash(&s->write_hash,m); 259 memset(&(s->s3->write_sequence[0]),0,8); 260 mac_secret= &(s->s3->write_mac_secret[0]); 261 } 262 263 if (reuse_dd) 264 EVP_CIPHER_CTX_cleanup(dd); 265 266 p=s->s3->tmp.key_block; 267 i=EVP_MD_size(m); 268 cl=EVP_CIPHER_key_length(c); 269 j = cl; 270 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 271 k=EVP_CIPHER_iv_length(c); 272 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 273 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 274 { 275 ms= &(p[ 0]); n=i+i; 276 key= &(p[ n]); n+=j+j; 277 iv= &(p[ n]); n+=k+k; 278 } 279 else 280 { 281 n=i; 282 ms= &(p[ n]); n+=i+j; 283 key= &(p[ n]); n+=j+k; 284 iv= &(p[ n]); n+=k; 285 } 286 287 if (n > s->s3->tmp.key_block_length) 288 { 289 OPENSSL_PUT_ERROR(SSL, ssl3_change_cipher_state, ERR_R_INTERNAL_ERROR); 290 goto err2; 291 } 292 293 memcpy(mac_secret,ms,i); 294 295 s->session->key_arg_length=0; 296 297 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 298 299 #ifdef OPENSSL_SSL_TRACE_CRYPTO 300 if (s->msg_callback) 301 { 302 303 int wh = which & SSL3_CC_WRITE ? 304 TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ; 305 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC, 306 mac_secret, EVP_MD_size(m), 307 s, s->msg_callback_arg); 308 if (c->key_len) 309 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY, 310 key, c->key_len, 311 s, s->msg_callback_arg); 312 if (k) 313 { 314 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV, 315 iv, k, s, s->msg_callback_arg); 316 } 317 } 318 #endif 319 320 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 321 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 322 return(1); 323 err: 324 OPENSSL_PUT_ERROR(SSL, ssl3_change_cipher_state, ERR_R_MALLOC_FAILURE); 325 err2: 326 return(0); 327 } 328 329 int ssl3_setup_key_block(SSL *s) 330 { 331 unsigned char *p; 332 const EVP_CIPHER *c; 333 const EVP_MD *hash; 334 size_t num; 335 int ret = 0; 336 337 if (s->s3->tmp.key_block_length != 0) 338 return(1); 339 340 if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL)) 341 { 342 OPENSSL_PUT_ERROR(SSL, ssl3_setup_key_block, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 343 return(0); 344 } 345 346 s->s3->tmp.new_sym_enc=c; 347 s->s3->tmp.new_hash=hash; 348 349 num=EVP_MD_size(hash); 350 351 num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c); 352 num*=2; 353 354 ssl3_cleanup_key_block(s); 355 356 if ((p=OPENSSL_malloc(num)) == NULL) 357 goto err; 358 359 s->s3->tmp.key_block_length=num; 360 s->s3->tmp.key_block=p; 361 362 ret = ssl3_generate_key_block(s,p,num); 363 364 /* enable vulnerability countermeasure for CBC ciphers with 365 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) */ 366 if ((s->mode & SSL_MODE_CBC_RECORD_SPLITTING) != 0) 367 { 368 s->s3->need_record_splitting = 1; 369 370 if (s->session->cipher != NULL) 371 { 372 if (s->session->cipher->algorithm_enc == SSL_RC4) 373 s->s3->need_record_splitting = 0; 374 } 375 } 376 377 return ret; 378 379 err: 380 OPENSSL_PUT_ERROR(SSL, ssl3_setup_key_block, ERR_R_MALLOC_FAILURE); 381 return(0); 382 } 383 384 void ssl3_cleanup_key_block(SSL *s) 385 { 386 if (s->s3->tmp.key_block != NULL) 387 { 388 OPENSSL_cleanse(s->s3->tmp.key_block, 389 s->s3->tmp.key_block_length); 390 OPENSSL_free(s->s3->tmp.key_block); 391 s->s3->tmp.key_block=NULL; 392 } 393 s->s3->tmp.key_block_length=0; 394 } 395 396 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. 397 * 398 * Returns: 399 * 0: (in non-constant time) if the record is publically invalid (i.e. too 400 * short etc). 401 * 1: if the record's padding is valid / the encryption was successful. 402 * -1: if the record's padding is invalid or, if sending, an internal error 403 * occured. 404 */ 405 int ssl3_enc(SSL *s, int send) 406 { 407 SSL3_RECORD *rec; 408 EVP_CIPHER_CTX *ds; 409 unsigned long l; 410 int bs,i,mac_size=0; 411 const EVP_CIPHER *enc; 412 413 if (send) 414 { 415 ds=s->enc_write_ctx; 416 rec= &(s->s3->wrec); 417 if (s->enc_write_ctx == NULL) 418 enc=NULL; 419 else 420 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 421 } 422 else 423 { 424 ds=s->enc_read_ctx; 425 rec= &(s->s3->rrec); 426 if (s->enc_read_ctx == NULL) 427 enc=NULL; 428 else 429 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 430 } 431 432 if ((s->session == NULL) || (ds == NULL) || 433 (enc == NULL)) 434 { 435 memmove(rec->data,rec->input,rec->length); 436 rec->input=rec->data; 437 } 438 else 439 { 440 l=rec->length; 441 bs=EVP_CIPHER_block_size(ds->cipher); 442 443 /* COMPRESS */ 444 445 if ((bs != 1) && send) 446 { 447 i=bs-((int)l%bs); 448 449 /* we need to add 'i-1' padding bytes */ 450 l+=i; 451 /* the last of these zero bytes will be overwritten 452 * with the padding length. */ 453 memset(&rec->input[rec->length], 0, i); 454 rec->length+=i; 455 rec->input[l-1]=(i-1); 456 } 457 458 if (!send) 459 { 460 if (l == 0 || l%bs != 0) 461 return 0; 462 /* otherwise, rec->length >= bs */ 463 } 464 465 EVP_Cipher(ds,rec->data,rec->input,l); 466 467 if (EVP_MD_CTX_md(s->read_hash) != NULL) 468 mac_size = EVP_MD_CTX_size(s->read_hash); 469 if ((bs != 1) && !send) 470 return ssl3_cbc_remove_padding(s, rec, bs, mac_size); 471 } 472 return(1); 473 } 474 475 void ssl3_init_finished_mac(SSL *s) 476 { 477 if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); 478 if (s->s3->handshake_dgst) ssl3_free_digest_list(s); 479 s->s3->handshake_buffer=BIO_new(BIO_s_mem()); 480 (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); 481 } 482 483 void ssl3_free_digest_list(SSL *s) 484 { 485 int i; 486 if (!s->s3->handshake_dgst) return; 487 for (i=0;i<SSL_MAX_DIGEST;i++) 488 { 489 if (s->s3->handshake_dgst[i]) 490 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); 491 } 492 OPENSSL_free(s->s3->handshake_dgst); 493 s->s3->handshake_dgst=NULL; 494 } 495 496 497 498 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 499 { 500 if (s->s3->handshake_buffer) 501 { 502 BIO_write (s->s3->handshake_buffer,(void *)buf,len); 503 } 504 else 505 { 506 int i; 507 for (i=0;i< SSL_MAX_DIGEST;i++) 508 { 509 if (s->s3->handshake_dgst[i]!= NULL) 510 EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); 511 } 512 } 513 } 514 515 int ssl3_digest_cached_records(SSL *s) 516 { 517 int i; 518 long mask; 519 const EVP_MD *md; 520 const uint8_t *hdata; 521 size_t hdatalen; 522 523 /* Allocate handshake_dgst array */ 524 ssl3_free_digest_list(s); 525 s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); 526 memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); 527 if (!BIO_mem_contents(s->s3->handshake_buffer, &hdata, &hdatalen)) 528 { 529 OPENSSL_PUT_ERROR(SSL, ssl3_digest_cached_records, SSL_R_BAD_HANDSHAKE_LENGTH); 530 return 0; 531 } 532 533 /* Loop through bitso of algorithm2 field and create MD_CTX-es */ 534 for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) 535 { 536 if ((mask & ssl_get_algorithm2(s)) && md) 537 { 538 s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); 539 EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); 540 EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); 541 } 542 else 543 { 544 s->s3->handshake_dgst[i]=NULL; 545 } 546 } 547 /* Free handshake_buffer BIO */ 548 BIO_free(s->s3->handshake_buffer); 549 s->s3->handshake_buffer = NULL; 550 551 return 1; 552 } 553 554 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) 555 { 556 return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); 557 } 558 int ssl3_final_finish_mac(SSL *s, 559 const char *sender, int len, unsigned char *p) 560 { 561 int ret, sha1len; 562 ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); 563 if(ret == 0) 564 return 0; 565 566 p+=ret; 567 568 sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p); 569 if(sha1len == 0) 570 return 0; 571 572 ret+=sha1len; 573 return(ret); 574 } 575 576 static int ssl3_handshake_mac(SSL *s, int md_nid, 577 const char *sender, int len, unsigned char *p) 578 { 579 unsigned int ret; 580 int npad,n; 581 unsigned int i; 582 unsigned char md_buf[EVP_MAX_MD_SIZE]; 583 EVP_MD_CTX ctx,*d=NULL; 584 585 if (s->s3->handshake_buffer) 586 if (!ssl3_digest_cached_records(s)) 587 return 0; 588 589 /* Search for digest of specified type in the handshake_dgst 590 * array*/ 591 for (i=0;i<SSL_MAX_DIGEST;i++) 592 { 593 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 594 { 595 d=s->s3->handshake_dgst[i]; 596 break; 597 } 598 } 599 if (!d) { 600 OPENSSL_PUT_ERROR(SSL, ssl3_handshake_mac, SSL_R_NO_REQUIRED_DIGEST); 601 return 0; 602 } 603 EVP_MD_CTX_init(&ctx); 604 EVP_MD_CTX_copy_ex(&ctx,d); 605 n=EVP_MD_CTX_size(&ctx); 606 if (n < 0) 607 return 0; 608 609 npad=(48/n)*n; 610 if (sender != NULL) 611 EVP_DigestUpdate(&ctx,sender,len); 612 EVP_DigestUpdate(&ctx,s->session->master_key, 613 s->session->master_key_length); 614 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 615 EVP_DigestFinal_ex(&ctx,md_buf,&i); 616 617 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 618 EVP_DigestUpdate(&ctx,s->session->master_key, 619 s->session->master_key_length); 620 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 621 EVP_DigestUpdate(&ctx,md_buf,i); 622 EVP_DigestFinal_ex(&ctx,p,&ret); 623 624 EVP_MD_CTX_cleanup(&ctx); 625 626 return((int)ret); 627 } 628 629 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) 630 { 631 SSL3_RECORD *rec; 632 unsigned char *mac_sec,*seq; 633 EVP_MD_CTX md_ctx; 634 const EVP_MD_CTX *hash; 635 unsigned char *p,rec_char; 636 size_t md_size, orig_len; 637 int npad; 638 int t; 639 640 if (send) 641 { 642 rec= &(ssl->s3->wrec); 643 mac_sec= &(ssl->s3->write_mac_secret[0]); 644 seq= &(ssl->s3->write_sequence[0]); 645 hash=ssl->write_hash; 646 } 647 else 648 { 649 rec= &(ssl->s3->rrec); 650 mac_sec= &(ssl->s3->read_mac_secret[0]); 651 seq= &(ssl->s3->read_sequence[0]); 652 hash=ssl->read_hash; 653 } 654 655 t=EVP_MD_CTX_size(hash); 656 if (t < 0 || t > 20) 657 return -1; 658 md_size=t; 659 npad=(48/md_size)*md_size; 660 661 /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */ 662 orig_len = rec->length+md_size+((unsigned int)rec->type>>8); 663 rec->type &= 0xff; 664 665 if (!send && 666 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && 667 ssl3_cbc_record_digest_supported(hash)) 668 { 669 /* This is a CBC-encrypted record. We must avoid leaking any 670 * timing-side channel information about how many blocks of 671 * data we are hashing because that gives an attacker a 672 * timing-oracle. */ 673 674 /* npad is, at most, 48 bytes and that's with MD5: 675 * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. 676 * 677 * With SHA-1 (the largest hash speced for SSLv3) the hash size 678 * goes up 4, but npad goes down by 8, resulting in a smaller 679 * total size. */ 680 unsigned char header[75]; 681 unsigned j = 0; 682 memcpy(header+j, mac_sec, md_size); 683 j += md_size; 684 memcpy(header+j, ssl3_pad_1, npad); 685 j += npad; 686 memcpy(header+j, seq, 8); 687 j += 8; 688 header[j++] = rec->type; 689 header[j++] = rec->length >> 8; 690 header[j++] = rec->length & 0xff; 691 692 ssl3_cbc_digest_record( 693 hash, 694 md, &md_size, 695 header, rec->input, 696 rec->length + md_size, orig_len, 697 mac_sec, md_size, 698 1 /* is SSLv3 */); 699 } 700 else 701 { 702 unsigned int md_size_u; 703 /* Chop the digest off the end :-) */ 704 EVP_MD_CTX_init(&md_ctx); 705 706 EVP_MD_CTX_copy_ex( &md_ctx,hash); 707 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 708 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 709 EVP_DigestUpdate(&md_ctx,seq,8); 710 rec_char=rec->type; 711 EVP_DigestUpdate(&md_ctx,&rec_char,1); 712 p=md; 713 s2n(rec->length,p); 714 EVP_DigestUpdate(&md_ctx,md,2); 715 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 716 EVP_DigestFinal_ex( &md_ctx,md,NULL); 717 718 EVP_MD_CTX_copy_ex( &md_ctx,hash); 719 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 720 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 721 EVP_DigestUpdate(&md_ctx,md,md_size); 722 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u); 723 md_size = md_size_u; 724 725 EVP_MD_CTX_cleanup(&md_ctx); 726 } 727 728 ssl3_record_sequence_update(seq); 729 return(md_size); 730 } 731 732 void ssl3_record_sequence_update(unsigned char *seq) 733 { 734 int i; 735 736 for (i=7; i>=0; i--) 737 { 738 ++seq[i]; 739 if (seq[i] != 0) break; 740 } 741 } 742 743 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 744 int len) 745 { 746 static const unsigned char *salt[3]={ 747 (const unsigned char *)"A", 748 (const unsigned char *)"BB", 749 (const unsigned char *)"CCC", 750 }; 751 unsigned char buf[EVP_MAX_MD_SIZE]; 752 EVP_MD_CTX ctx; 753 int i,ret=0; 754 unsigned int n; 755 #ifdef OPENSSL_SSL_TRACE_CRYPTO 756 unsigned char *tmpout = out; 757 #endif 758 759 EVP_MD_CTX_init(&ctx); 760 for (i=0; i<3; i++) 761 { 762 EVP_DigestInit_ex(&ctx, EVP_sha1(), NULL); 763 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 764 EVP_DigestUpdate(&ctx,p,len); 765 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 766 SSL3_RANDOM_SIZE); 767 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 768 SSL3_RANDOM_SIZE); 769 EVP_DigestFinal_ex(&ctx,buf,&n); 770 771 EVP_DigestInit_ex(&ctx, EVP_md5(), NULL); 772 EVP_DigestUpdate(&ctx,p,len); 773 EVP_DigestUpdate(&ctx,buf,n); 774 EVP_DigestFinal_ex(&ctx,out,&n); 775 out+=n; 776 ret+=n; 777 } 778 EVP_MD_CTX_cleanup(&ctx); 779 780 #ifdef OPENSSL_SSL_TRACE_CRYPTO 781 if (s->msg_callback) 782 { 783 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER, 784 p, len, s, s->msg_callback_arg); 785 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM, 786 s->s3->client_random, SSL3_RANDOM_SIZE, 787 s, s->msg_callback_arg); 788 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM, 789 s->s3->server_random, SSL3_RANDOM_SIZE, 790 s, s->msg_callback_arg); 791 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER, 792 tmpout, SSL3_MASTER_SECRET_SIZE, 793 s, s->msg_callback_arg); 794 } 795 #endif 796 return(ret); 797 } 798 799 int ssl3_alert_code(int code) 800 { 801 switch (code) 802 { 803 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 804 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 805 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 806 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 807 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 808 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 809 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 810 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 811 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 812 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 813 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 814 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 815 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 816 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 817 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 818 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 819 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 820 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 821 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 822 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 823 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 824 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 825 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 826 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 827 case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); 828 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); 829 case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); 830 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); 831 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); 832 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 833 case SSL_AD_INAPPROPRIATE_FALLBACK:return(SSL3_AD_INAPPROPRIATE_FALLBACK); 834 default: return(-1); 835 } 836 } 837 838
