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) 1998-2002 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 (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 #include <stdio.h> 113 #include "ssl_locl.h" 114 #include <openssl/evp.h> 115 #include <openssl/md5.h> 116 117 static 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 }; 124 125 static 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 }; 132 133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 134 const char *sender, int len, unsigned char *p); 135 136 static 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 } 191 192 int ssl3_change_cipher_state(SSL *s, int which) 193 { 194 unsigned char *p,*key_block,*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 key_block=s->s3->tmp.key_block; 218 219 if (which & SSL3_CC_READ) 220 { 221 if (s->enc_read_ctx != NULL) 222 reuse_dd = 1; 223 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 224 goto err; 225 else 226 /* make sure it's intialized in case we exit later with an error */ 227 EVP_CIPHER_CTX_init(s->enc_read_ctx); 228 dd= s->enc_read_ctx; 229 s->read_hash=m; 230 #ifndef OPENSSL_NO_COMP 231 /* COMPRESS */ 232 if (s->expand != NULL) 233 { 234 COMP_CTX_free(s->expand); 235 s->expand=NULL; 236 } 237 if (comp != NULL) 238 { 239 s->expand=COMP_CTX_new(comp); 240 if (s->expand == NULL) 241 { 242 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 243 goto err2; 244 } 245 if (s->s3->rrec.comp == NULL) 246 s->s3->rrec.comp=(unsigned char *) 247 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 248 if (s->s3->rrec.comp == NULL) 249 goto err; 250 } 251 #endif 252 memset(&(s->s3->read_sequence[0]),0,8); 253 mac_secret= &(s->s3->read_mac_secret[0]); 254 } 255 else 256 { 257 if (s->enc_write_ctx != NULL) 258 reuse_dd = 1; 259 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 260 goto err; 261 else 262 /* make sure it's intialized in case we exit later with an error */ 263 EVP_CIPHER_CTX_init(s->enc_write_ctx); 264 dd= s->enc_write_ctx; 265 s->write_hash=m; 266 #ifndef OPENSSL_NO_COMP 267 /* COMPRESS */ 268 if (s->compress != NULL) 269 { 270 COMP_CTX_free(s->compress); 271 s->compress=NULL; 272 } 273 if (comp != NULL) 274 { 275 s->compress=COMP_CTX_new(comp); 276 if (s->compress == NULL) 277 { 278 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 279 goto err2; 280 } 281 } 282 #endif 283 memset(&(s->s3->write_sequence[0]),0,8); 284 mac_secret= &(s->s3->write_mac_secret[0]); 285 } 286 287 if (reuse_dd) 288 EVP_CIPHER_CTX_cleanup(dd); 289 290 p=s->s3->tmp.key_block; 291 i=EVP_MD_size(m); 292 cl=EVP_CIPHER_key_length(c); 293 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 294 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 295 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 296 k=EVP_CIPHER_iv_length(c); 297 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 298 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 299 { 300 ms= &(p[ 0]); n=i+i; 301 key= &(p[ n]); n+=j+j; 302 iv= &(p[ n]); n+=k+k; 303 er1= &(s->s3->client_random[0]); 304 er2= &(s->s3->server_random[0]); 305 } 306 else 307 { 308 n=i; 309 ms= &(p[ n]); n+=i+j; 310 key= &(p[ n]); n+=j+k; 311 iv= &(p[ n]); n+=k; 312 er1= &(s->s3->server_random[0]); 313 er2= &(s->s3->client_random[0]); 314 } 315 316 if (n > s->s3->tmp.key_block_length) 317 { 318 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 319 goto err2; 320 } 321 322 EVP_MD_CTX_init(&md); 323 memcpy(mac_secret,ms,i); 324 if (is_exp) 325 { 326 /* In here I set both the read and write key/iv to the 327 * same value since only the correct one will be used :-). 328 */ 329 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 330 EVP_DigestUpdate(&md,key,j); 331 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 332 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 333 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 334 key= &(exp_key[0]); 335 336 if (k > 0) 337 { 338 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 339 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 340 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 341 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 342 iv= &(exp_iv[0]); 343 } 344 } 345 346 s->session->key_arg_length=0; 347 348 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 349 350 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 351 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 352 EVP_MD_CTX_cleanup(&md); 353 return(1); 354 err: 355 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 356 err2: 357 return(0); 358 } 359 360 int ssl3_setup_key_block(SSL *s) 361 { 362 unsigned char *p; 363 const EVP_CIPHER *c; 364 const EVP_MD *hash; 365 int num; 366 int ret = 0; 367 SSL_COMP *comp; 368 369 if (s->s3->tmp.key_block_length != 0) 370 return(1); 371 372 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 373 { 374 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 375 return(0); 376 } 377 378 s->s3->tmp.new_sym_enc=c; 379 s->s3->tmp.new_hash=hash; 380 #ifdef OPENSSL_NO_COMP 381 s->s3->tmp.new_compression=NULL; 382 #else 383 s->s3->tmp.new_compression=comp; 384 #endif 385 386 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 387 num*=2; 388 389 ssl3_cleanup_key_block(s); 390 391 if ((p=OPENSSL_malloc(num)) == NULL) 392 goto err; 393 394 s->s3->tmp.key_block_length=num; 395 s->s3->tmp.key_block=p; 396 397 ret = ssl3_generate_key_block(s,p,num); 398 399 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 400 { 401 /* enable vulnerability countermeasure for CBC ciphers with 402 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 403 */ 404 s->s3->need_empty_fragments = 1; 405 406 if (s->session->cipher != NULL) 407 { 408 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 409 s->s3->need_empty_fragments = 0; 410 411 #ifndef OPENSSL_NO_RC4 412 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 413 s->s3->need_empty_fragments = 0; 414 #endif 415 } 416 } 417 418 return ret; 419 420 err: 421 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 422 return(0); 423 } 424 425 void ssl3_cleanup_key_block(SSL *s) 426 { 427 if (s->s3->tmp.key_block != NULL) 428 { 429 OPENSSL_cleanse(s->s3->tmp.key_block, 430 s->s3->tmp.key_block_length); 431 OPENSSL_free(s->s3->tmp.key_block); 432 s->s3->tmp.key_block=NULL; 433 } 434 s->s3->tmp.key_block_length=0; 435 } 436 437 int ssl3_enc(SSL *s, int send) 438 { 439 SSL3_RECORD *rec; 440 EVP_CIPHER_CTX *ds; 441 unsigned long l; 442 int bs,i; 443 const EVP_CIPHER *enc; 444 445 if (send) 446 { 447 ds=s->enc_write_ctx; 448 rec= &(s->s3->wrec); 449 if (s->enc_write_ctx == NULL) 450 enc=NULL; 451 else 452 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 453 } 454 else 455 { 456 ds=s->enc_read_ctx; 457 rec= &(s->s3->rrec); 458 if (s->enc_read_ctx == NULL) 459 enc=NULL; 460 else 461 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 462 } 463 464 if ((s->session == NULL) || (ds == NULL) || 465 (enc == NULL)) 466 { 467 memmove(rec->data,rec->input,rec->length); 468 rec->input=rec->data; 469 } 470 else 471 { 472 l=rec->length; 473 bs=EVP_CIPHER_block_size(ds->cipher); 474 475 /* COMPRESS */ 476 477 if ((bs != 1) && send) 478 { 479 i=bs-((int)l%bs); 480 481 /* we need to add 'i-1' padding bytes */ 482 l+=i; 483 rec->length+=i; 484 rec->input[l-1]=(i-1); 485 } 486 487 if (!send) 488 { 489 if (l == 0 || l%bs != 0) 490 { 491 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 492 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 493 return 0; 494 } 495 /* otherwise, rec->length >= bs */ 496 } 497 498 EVP_Cipher(ds,rec->data,rec->input,l); 499 500 if ((bs != 1) && !send) 501 { 502 i=rec->data[l-1]+1; 503 /* SSL 3.0 bounds the number of padding bytes by the block size; 504 * padding bytes (except the last one) are arbitrary */ 505 if (i > bs) 506 { 507 /* Incorrect padding. SSLerr() and ssl3_alert are done 508 * by caller: we don't want to reveal whether this is 509 * a decryption error or a MAC verification failure 510 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 511 return -1; 512 } 513 /* now i <= bs <= rec->length */ 514 rec->length-=i; 515 } 516 } 517 return(1); 518 } 519 520 void ssl3_init_finished_mac(SSL *s) 521 { 522 EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1), 523 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 524 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); 525 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); 526 } 527 528 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 529 { 530 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); 531 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); 532 } 533 534 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) 535 { 536 return(ssl3_handshake_mac(s,ctx,NULL,0,p)); 537 } 538 539 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, 540 const char *sender, int len, unsigned char *p) 541 { 542 int ret; 543 544 ret=ssl3_handshake_mac(s,ctx1,sender,len,p); 545 p+=ret; 546 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); 547 return(ret); 548 } 549 550 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 551 const char *sender, int len, unsigned char *p) 552 { 553 unsigned int ret; 554 int npad,n; 555 unsigned int i; 556 unsigned char md_buf[EVP_MAX_MD_SIZE]; 557 EVP_MD_CTX ctx; 558 559 EVP_MD_CTX_init(&ctx); 560 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 561 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 562 563 n=EVP_MD_CTX_size(&ctx); 564 npad=(48/n)*n; 565 566 if (sender != NULL) 567 EVP_DigestUpdate(&ctx,sender,len); 568 EVP_DigestUpdate(&ctx,s->session->master_key, 569 s->session->master_key_length); 570 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 571 EVP_DigestFinal_ex(&ctx,md_buf,&i); 572 573 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 574 EVP_DigestUpdate(&ctx,s->session->master_key, 575 s->session->master_key_length); 576 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 577 EVP_DigestUpdate(&ctx,md_buf,i); 578 EVP_DigestFinal_ex(&ctx,p,&ret); 579 580 EVP_MD_CTX_cleanup(&ctx); 581 582 return((int)ret); 583 } 584 585 int ssl3_mac(SSL *ssl, unsigned char *md, int send) 586 { 587 SSL3_RECORD *rec; 588 unsigned char *mac_sec,*seq; 589 EVP_MD_CTX md_ctx; 590 const EVP_MD *hash; 591 unsigned char *p,rec_char; 592 unsigned int md_size; 593 int npad; 594 595 if (send) 596 { 597 rec= &(ssl->s3->wrec); 598 mac_sec= &(ssl->s3->write_mac_secret[0]); 599 seq= &(ssl->s3->write_sequence[0]); 600 hash=ssl->write_hash; 601 } 602 else 603 { 604 rec= &(ssl->s3->rrec); 605 mac_sec= &(ssl->s3->read_mac_secret[0]); 606 seq= &(ssl->s3->read_sequence[0]); 607 hash=ssl->read_hash; 608 } 609 610 md_size=EVP_MD_size(hash); 611 npad=(48/md_size)*md_size; 612 613 /* Chop the digest off the end :-) */ 614 EVP_MD_CTX_init(&md_ctx); 615 616 EVP_DigestInit_ex( &md_ctx,hash, NULL); 617 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 618 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 619 EVP_DigestUpdate(&md_ctx,seq,8); 620 rec_char=rec->type; 621 EVP_DigestUpdate(&md_ctx,&rec_char,1); 622 p=md; 623 s2n(rec->length,p); 624 EVP_DigestUpdate(&md_ctx,md,2); 625 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 626 EVP_DigestFinal_ex( &md_ctx,md,NULL); 627 628 EVP_DigestInit_ex( &md_ctx,hash, NULL); 629 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 630 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 631 EVP_DigestUpdate(&md_ctx,md,md_size); 632 EVP_DigestFinal_ex( &md_ctx,md,&md_size); 633 634 EVP_MD_CTX_cleanup(&md_ctx); 635 636 ssl3_record_sequence_update(seq); 637 return(md_size); 638 } 639 640 void ssl3_record_sequence_update(unsigned char *seq) 641 { 642 int i; 643 644 for (i=7; i>=0; i--) 645 { 646 ++seq[i]; 647 if (seq[i] != 0) break; 648 } 649 } 650 651 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 652 int len) 653 { 654 static const unsigned char *salt[3]={ 655 #ifndef CHARSET_EBCDIC 656 (const unsigned char *)"A", 657 (const unsigned char *)"BB", 658 (const unsigned char *)"CCC", 659 #else 660 (const unsigned char *)"\x41", 661 (const unsigned char *)"\x42\x42", 662 (const unsigned char *)"\x43\x43\x43", 663 #endif 664 }; 665 unsigned char buf[EVP_MAX_MD_SIZE]; 666 EVP_MD_CTX ctx; 667 int i,ret=0; 668 unsigned int n; 669 670 EVP_MD_CTX_init(&ctx); 671 for (i=0; i<3; i++) 672 { 673 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 674 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 675 EVP_DigestUpdate(&ctx,p,len); 676 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 677 SSL3_RANDOM_SIZE); 678 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 679 SSL3_RANDOM_SIZE); 680 EVP_DigestFinal_ex(&ctx,buf,&n); 681 682 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 683 EVP_DigestUpdate(&ctx,p,len); 684 EVP_DigestUpdate(&ctx,buf,n); 685 EVP_DigestFinal_ex(&ctx,out,&n); 686 out+=n; 687 ret+=n; 688 } 689 EVP_MD_CTX_cleanup(&ctx); 690 return(ret); 691 } 692 693 int ssl3_alert_code(int code) 694 { 695 switch (code) 696 { 697 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 698 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 699 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 700 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 701 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 702 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 703 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 704 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 705 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 706 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 707 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 708 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 709 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 710 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 711 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 712 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 713 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 714 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 715 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 716 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 717 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 718 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 719 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 720 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 721 default: return(-1); 722 } 723 } 724 725
