s3_enc.c revision 273415
1/* ssl/s3_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#include <openssl/evp.h> 115#include <openssl/md5.h> 116 117static unsigned char ssl3_pad_1[48]={ 118 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 119 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 120 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 121 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 122 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, 123 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; 124 125static unsigned char ssl3_pad_2[48]={ 126 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 127 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 128 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 129 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 130 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, 131 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; 132 133static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 134 const char *sender, int len, unsigned char *p); 135 136static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) 137 { 138 EVP_MD_CTX m5; 139 EVP_MD_CTX s1; 140 unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; 141 unsigned char c='A'; 142 unsigned int i,j,k; 143 144#ifdef CHARSET_EBCDIC 145 c = os_toascii[c]; /*'A' in ASCII */ 146#endif 147 k=0; 148 EVP_MD_CTX_init(&m5); 149 EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 150 EVP_MD_CTX_init(&s1); 151 for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) 152 { 153 k++; 154 if (k > sizeof buf) 155 { 156 /* bug: 'buf' is too small for this ciphersuite */ 157 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); 158 return 0; 159 } 160 161 for (j=0; j<k; j++) 162 buf[j]=c; 163 c++; 164 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); 165 EVP_DigestUpdate(&s1,buf,k); 166 EVP_DigestUpdate(&s1,s->session->master_key, 167 s->session->master_key_length); 168 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); 169 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); 170 EVP_DigestFinal_ex(&s1,smd,NULL); 171 172 EVP_DigestInit_ex(&m5,EVP_md5(), NULL); 173 EVP_DigestUpdate(&m5,s->session->master_key, 174 s->session->master_key_length); 175 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); 176 if ((int)(i+MD5_DIGEST_LENGTH) > num) 177 { 178 EVP_DigestFinal_ex(&m5,smd,NULL); 179 memcpy(km,smd,(num-i)); 180 } 181 else 182 EVP_DigestFinal_ex(&m5,km,NULL); 183 184 km+=MD5_DIGEST_LENGTH; 185 } 186 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); 187 EVP_MD_CTX_cleanup(&m5); 188 EVP_MD_CTX_cleanup(&s1); 189 return 1; 190 } 191 192int ssl3_change_cipher_state(SSL *s, int which) 193 { 194 unsigned char *p,*mac_secret; 195 unsigned char exp_key[EVP_MAX_KEY_LENGTH]; 196 unsigned char exp_iv[EVP_MAX_IV_LENGTH]; 197 unsigned char *ms,*key,*iv,*er1,*er2; 198 EVP_CIPHER_CTX *dd; 199 const EVP_CIPHER *c; 200#ifndef OPENSSL_NO_COMP 201 COMP_METHOD *comp; 202#endif 203 const EVP_MD *m; 204 EVP_MD_CTX md; 205 int is_exp,n,i,j,k,cl; 206 int reuse_dd = 0; 207 208 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 209 c=s->s3->tmp.new_sym_enc; 210 m=s->s3->tmp.new_hash; 211#ifndef OPENSSL_NO_COMP 212 if (s->s3->tmp.new_compression == NULL) 213 comp=NULL; 214 else 215 comp=s->s3->tmp.new_compression->method; 216#endif 217 218 if (which & SSL3_CC_READ) 219 { 220 if (s->enc_read_ctx != NULL) 221 reuse_dd = 1; 222 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 223 goto err; 224 else 225 /* make sure it's intialized in case we exit later with an error */ 226 EVP_CIPHER_CTX_init(s->enc_read_ctx); 227 dd= s->enc_read_ctx; 228 s->read_hash=m; 229#ifndef OPENSSL_NO_COMP 230 /* COMPRESS */ 231 if (s->expand != NULL) 232 { 233 COMP_CTX_free(s->expand); 234 s->expand=NULL; 235 } 236 if (comp != NULL) 237 { 238 s->expand=COMP_CTX_new(comp); 239 if (s->expand == NULL) 240 { 241 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 242 goto err2; 243 } 244 if (s->s3->rrec.comp == NULL) 245 s->s3->rrec.comp=(unsigned char *) 246 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 247 if (s->s3->rrec.comp == NULL) 248 goto err; 249 } 250#endif 251 memset(&(s->s3->read_sequence[0]),0,8); 252 mac_secret= &(s->s3->read_mac_secret[0]); 253 } 254 else 255 { 256 if (s->enc_write_ctx != NULL) 257 reuse_dd = 1; 258 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 259 goto err; 260 else 261 /* make sure it's intialized in case we exit later with an error */ 262 EVP_CIPHER_CTX_init(s->enc_write_ctx); 263 dd= s->enc_write_ctx; 264 s->write_hash=m; 265#ifndef OPENSSL_NO_COMP 266 /* COMPRESS */ 267 if (s->compress != NULL) 268 { 269 COMP_CTX_free(s->compress); 270 s->compress=NULL; 271 } 272 if (comp != NULL) 273 { 274 s->compress=COMP_CTX_new(comp); 275 if (s->compress == NULL) 276 { 277 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 278 goto err2; 279 } 280 } 281#endif 282 memset(&(s->s3->write_sequence[0]),0,8); 283 mac_secret= &(s->s3->write_mac_secret[0]); 284 } 285 286 if (reuse_dd) 287 EVP_CIPHER_CTX_cleanup(dd); 288 289 p=s->s3->tmp.key_block; 290 i=EVP_MD_size(m); 291 cl=EVP_CIPHER_key_length(c); 292 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 293 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 294 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 295 k=EVP_CIPHER_iv_length(c); 296 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 297 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 298 { 299 ms= &(p[ 0]); n=i+i; 300 key= &(p[ n]); n+=j+j; 301 iv= &(p[ n]); n+=k+k; 302 er1= &(s->s3->client_random[0]); 303 er2= &(s->s3->server_random[0]); 304 } 305 else 306 { 307 n=i; 308 ms= &(p[ n]); n+=i+j; 309 key= &(p[ n]); n+=j+k; 310 iv= &(p[ n]); n+=k; 311 er1= &(s->s3->server_random[0]); 312 er2= &(s->s3->client_random[0]); 313 } 314 315 if (n > s->s3->tmp.key_block_length) 316 { 317 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 318 goto err2; 319 } 320 321 EVP_MD_CTX_init(&md); 322 memcpy(mac_secret,ms,i); 323 if (is_exp) 324 { 325 /* In here I set both the read and write key/iv to the 326 * same value since only the correct one will be used :-). 327 */ 328 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 329 EVP_DigestUpdate(&md,key,j); 330 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 331 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 332 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 333 key= &(exp_key[0]); 334 335 if (k > 0) 336 { 337 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 338 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 339 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 340 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 341 iv= &(exp_iv[0]); 342 } 343 } 344 345 s->session->key_arg_length=0; 346 347 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 348 349 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 350 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 351 EVP_MD_CTX_cleanup(&md); 352 return(1); 353err: 354 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 355err2: 356 return(0); 357 } 358 359int ssl3_setup_key_block(SSL *s) 360 { 361 unsigned char *p; 362 const EVP_CIPHER *c; 363 const EVP_MD *hash; 364 int num; 365 int ret = 0; 366 SSL_COMP *comp; 367 368 if (s->s3->tmp.key_block_length != 0) 369 return(1); 370 371 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 372 { 373 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 374 return(0); 375 } 376 377 s->s3->tmp.new_sym_enc=c; 378 s->s3->tmp.new_hash=hash; 379#ifdef OPENSSL_NO_COMP 380 s->s3->tmp.new_compression=NULL; 381#else 382 s->s3->tmp.new_compression=comp; 383#endif 384 385 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 386 num*=2; 387 388 ssl3_cleanup_key_block(s); 389 390 if ((p=OPENSSL_malloc(num)) == NULL) 391 goto err; 392 393 s->s3->tmp.key_block_length=num; 394 s->s3->tmp.key_block=p; 395 396 ret = ssl3_generate_key_block(s,p,num); 397 398 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 399 { 400 /* enable vulnerability countermeasure for CBC ciphers with 401 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 402 */ 403 s->s3->need_empty_fragments = 1; 404 405 if (s->session->cipher != NULL) 406 { 407 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 408 s->s3->need_empty_fragments = 0; 409 410#ifndef OPENSSL_NO_RC4 411 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 412 s->s3->need_empty_fragments = 0; 413#endif 414 } 415 } 416 417 return ret; 418 419err: 420 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 421 return(0); 422 } 423 424void ssl3_cleanup_key_block(SSL *s) 425 { 426 if (s->s3->tmp.key_block != NULL) 427 { 428 OPENSSL_cleanse(s->s3->tmp.key_block, 429 s->s3->tmp.key_block_length); 430 OPENSSL_free(s->s3->tmp.key_block); 431 s->s3->tmp.key_block=NULL; 432 } 433 s->s3->tmp.key_block_length=0; 434 } 435 436/* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. 437 * 438 * Returns: 439 * 0: (in non-constant time) if the record is publically invalid (i.e. too 440 * short etc). 441 * 1: if the record's padding is valid / the encryption was successful. 442 * -1: if the record's padding is invalid or, if sending, an internal error 443 * occured. 444 */ 445int ssl3_enc(SSL *s, int send) 446 { 447 SSL3_RECORD *rec; 448 EVP_CIPHER_CTX *ds; 449 unsigned long l; 450 int bs,i,mac_size=0; 451 const EVP_CIPHER *enc; 452 453 if (send) 454 { 455 ds=s->enc_write_ctx; 456 rec= &(s->s3->wrec); 457 if (s->enc_write_ctx == NULL) 458 enc=NULL; 459 else 460 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 461 } 462 else 463 { 464 ds=s->enc_read_ctx; 465 rec= &(s->s3->rrec); 466 if (s->enc_read_ctx == NULL) 467 enc=NULL; 468 else 469 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 470 } 471 472 if ((s->session == NULL) || (ds == NULL) || 473 (enc == NULL)) 474 { 475 memmove(rec->data,rec->input,rec->length); 476 rec->input=rec->data; 477 } 478 else 479 { 480 l=rec->length; 481 bs=EVP_CIPHER_block_size(ds->cipher); 482 483 /* COMPRESS */ 484 485 if ((bs != 1) && send) 486 { 487 i=bs-((int)l%bs); 488 489 /* we need to add 'i-1' padding bytes */ 490 l+=i; 491 /* the last of these zero bytes will be overwritten 492 * with the padding length. */ 493 memset(&rec->input[rec->length], 0, i); 494 rec->length+=i; 495 rec->input[l-1]=(i-1); 496 } 497 498 if (!send) 499 { 500 if (l == 0 || l%bs != 0) 501 return 0; 502 /* otherwise, rec->length >= bs */ 503 } 504 505 EVP_Cipher(ds,rec->data,rec->input,l); 506 507 if (s->read_hash != NULL) 508 mac_size = EVP_MD_size(s->read_hash); 509 510 if ((bs != 1) && !send) 511 return ssl3_cbc_remove_padding(s, rec, bs, mac_size); 512 } 513 return(1); 514 } 515 516void ssl3_init_finished_mac(SSL *s) 517 { 518 EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1), 519 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 520 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); 521 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); 522 } 523 524void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 525 { 526 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); 527 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); 528 } 529 530int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) 531 { 532 return(ssl3_handshake_mac(s,ctx,NULL,0,p)); 533 } 534 535int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, 536 const char *sender, int len, unsigned char *p) 537 { 538 int ret; 539 540 ret=ssl3_handshake_mac(s,ctx1,sender,len,p); 541 p+=ret; 542 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); 543 return(ret); 544 } 545 546static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 547 const char *sender, int len, unsigned char *p) 548 { 549 unsigned int ret; 550 int npad,n; 551 unsigned int i; 552 unsigned char md_buf[EVP_MAX_MD_SIZE]; 553 EVP_MD_CTX ctx; 554 555 EVP_MD_CTX_init(&ctx); 556 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 557 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 558 559 n=EVP_MD_CTX_size(&ctx); 560 npad=(48/n)*n; 561 562 if (sender != NULL) 563 EVP_DigestUpdate(&ctx,sender,len); 564 EVP_DigestUpdate(&ctx,s->session->master_key, 565 s->session->master_key_length); 566 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 567 EVP_DigestFinal_ex(&ctx,md_buf,&i); 568 569 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 570 EVP_DigestUpdate(&ctx,s->session->master_key, 571 s->session->master_key_length); 572 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 573 EVP_DigestUpdate(&ctx,md_buf,i); 574 EVP_DigestFinal_ex(&ctx,p,&ret); 575 576 EVP_MD_CTX_cleanup(&ctx); 577 578 return((int)ret); 579 } 580 581int ssl3_mac(SSL *ssl, unsigned char *md, int send) 582 { 583 SSL3_RECORD *rec; 584 unsigned char *mac_sec,*seq; 585 EVP_MD_CTX md_ctx; 586 const EVP_MD *hash; 587 unsigned char *p,rec_char; 588 size_t md_size, orig_len; 589 int npad; 590 591 if (send) 592 { 593 rec= &(ssl->s3->wrec); 594 mac_sec= &(ssl->s3->write_mac_secret[0]); 595 seq= &(ssl->s3->write_sequence[0]); 596 hash=ssl->write_hash; 597 } 598 else 599 { 600 rec= &(ssl->s3->rrec); 601 mac_sec= &(ssl->s3->read_mac_secret[0]); 602 seq= &(ssl->s3->read_sequence[0]); 603 hash=ssl->read_hash; 604 } 605 606 md_size=EVP_MD_size(hash); 607 npad=(48/md_size)*md_size; 608 609 /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */ 610 orig_len = rec->length+md_size+((unsigned int)rec->type>>8); 611 rec->type &= 0xff; 612 613 if (!send && 614 EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && 615 ssl3_cbc_record_digest_supported(hash)) 616 { 617 /* This is a CBC-encrypted record. We must avoid leaking any 618 * timing-side channel information about how many blocks of 619 * data we are hashing because that gives an attacker a 620 * timing-oracle. */ 621 622 /* npad is, at most, 48 bytes and that's with MD5: 623 * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. 624 * 625 * With SHA-1 (the largest hash speced for SSLv3) the hash size 626 * goes up 4, but npad goes down by 8, resulting in a smaller 627 * total size. */ 628 unsigned char header[75]; 629 unsigned j = 0; 630 memcpy(header+j, mac_sec, md_size); 631 j += md_size; 632 memcpy(header+j, ssl3_pad_1, npad); 633 j += npad; 634 memcpy(header+j, seq, 8); 635 j += 8; 636 header[j++] = rec->type; 637 header[j++] = rec->length >> 8; 638 header[j++] = rec->length & 0xff; 639 640 ssl3_cbc_digest_record( 641 hash, 642 md, &md_size, 643 header, rec->input, 644 rec->length + md_size, orig_len, 645 mac_sec, md_size, 646 1 /* is SSLv3 */); 647 } 648 else 649 { 650 unsigned int md_size_u; 651 /* Chop the digest off the end :-) */ 652 EVP_MD_CTX_init(&md_ctx); 653 654 EVP_DigestInit_ex( &md_ctx,hash, NULL); 655 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 656 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 657 EVP_DigestUpdate(&md_ctx,seq,8); 658 rec_char=rec->type; 659 EVP_DigestUpdate(&md_ctx,&rec_char,1); 660 p=md; 661 s2n(rec->length,p); 662 EVP_DigestUpdate(&md_ctx,md,2); 663 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 664 EVP_DigestFinal_ex( &md_ctx,md,NULL); 665 666 EVP_DigestInit_ex( &md_ctx,hash, NULL); 667 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 668 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 669 EVP_DigestUpdate(&md_ctx,md,md_size); 670 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u); 671 md_size = md_size_u; 672 673 EVP_MD_CTX_cleanup(&md_ctx); 674 } 675 676 ssl3_record_sequence_update(seq); 677 return(md_size); 678 } 679 680void ssl3_record_sequence_update(unsigned char *seq) 681 { 682 int i; 683 684 for (i=7; i>=0; i--) 685 { 686 ++seq[i]; 687 if (seq[i] != 0) break; 688 } 689 } 690 691int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 692 int len) 693 { 694 static const unsigned char *salt[3]={ 695#ifndef CHARSET_EBCDIC 696 (const unsigned char *)"A", 697 (const unsigned char *)"BB", 698 (const unsigned char *)"CCC", 699#else 700 (const unsigned char *)"\x41", 701 (const unsigned char *)"\x42\x42", 702 (const unsigned char *)"\x43\x43\x43", 703#endif 704 }; 705 unsigned char buf[EVP_MAX_MD_SIZE]; 706 EVP_MD_CTX ctx; 707 int i,ret=0; 708 unsigned int n; 709 710 EVP_MD_CTX_init(&ctx); 711 for (i=0; i<3; i++) 712 { 713 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 714 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 715 EVP_DigestUpdate(&ctx,p,len); 716 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 717 SSL3_RANDOM_SIZE); 718 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 719 SSL3_RANDOM_SIZE); 720 EVP_DigestFinal_ex(&ctx,buf,&n); 721 722 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 723 EVP_DigestUpdate(&ctx,p,len); 724 EVP_DigestUpdate(&ctx,buf,n); 725 EVP_DigestFinal_ex(&ctx,out,&n); 726 out+=n; 727 ret+=n; 728 } 729 EVP_MD_CTX_cleanup(&ctx); 730 return(ret); 731 } 732 733int ssl3_alert_code(int code) 734 { 735 switch (code) 736 { 737 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 738 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 739 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 740 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 741 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 742 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 743 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 744 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 745 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 746 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 747 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 748 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 749 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 750 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 751 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 752 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 753 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 754 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 755 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 756 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 757 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 758 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 759 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 760 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 761 case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); 762 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); 763 case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); 764 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); 765 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); 766 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 767 case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK); 768 default: return(-1); 769 } 770 } 771