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 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; 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 ((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,*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 COMP_METHOD *comp; 201 const EVP_MD *m; 202 EVP_MD_CTX md; 203 int is_exp,n,i,j,k,cl; 204 int reuse_dd = 0; 205 206 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 207 c=s->s3->tmp.new_sym_enc; 208 m=s->s3->tmp.new_hash; 209 if (s->s3->tmp.new_compression == NULL) 210 comp=NULL; 211 else 212 comp=s->s3->tmp.new_compression->method; 213 key_block=s->s3->tmp.key_block; 214 215 if (which & SSL3_CC_READ) 216 { 217 if (s->enc_read_ctx != NULL) 218 reuse_dd = 1; 219 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 220 goto err; 221 dd= s->enc_read_ctx; 222 s->read_hash=m; 223 /* COMPRESS */ 224 if (s->expand != NULL) 225 { 226 COMP_CTX_free(s->expand); 227 s->expand=NULL; 228 } 229 if (comp != NULL) 230 { 231 s->expand=COMP_CTX_new(comp); 232 if (s->expand == NULL) 233 { 234 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 235 goto err2; 236 } 237 if (s->s3->rrec.comp == NULL) 238 s->s3->rrec.comp=(unsigned char *) 239 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 240 if (s->s3->rrec.comp == NULL) 241 goto err; 242 } 243 memset(&(s->s3->read_sequence[0]),0,8); 244 mac_secret= &(s->s3->read_mac_secret[0]); 245 } 246 else 247 { 248 if (s->enc_write_ctx != NULL) 249 reuse_dd = 1; 250 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 251 goto err; 252 dd= s->enc_write_ctx; 253 s->write_hash=m; 254 /* COMPRESS */ 255 if (s->compress != NULL) 256 { 257 COMP_CTX_free(s->compress); 258 s->compress=NULL; 259 } 260 if (comp != NULL) 261 { 262 s->compress=COMP_CTX_new(comp); 263 if (s->compress == NULL) 264 { 265 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 266 goto err2; 267 } 268 } 269 memset(&(s->s3->write_sequence[0]),0,8); 270 mac_secret= &(s->s3->write_mac_secret[0]); 271 } 272 273 if (reuse_dd) 274 EVP_CIPHER_CTX_cleanup(dd); 275 EVP_CIPHER_CTX_init(dd); 276 277 p=s->s3->tmp.key_block; 278 i=EVP_MD_size(m); 279 cl=EVP_CIPHER_key_length(c); 280 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 281 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 282 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 283 k=EVP_CIPHER_iv_length(c); 284 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 285 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 286 { 287 ms= &(p[ 0]); n=i+i; 288 key= &(p[ n]); n+=j+j; 289 iv= &(p[ n]); n+=k+k; 290 er1= &(s->s3->client_random[0]); 291 er2= &(s->s3->server_random[0]); 292 } 293 else 294 { 295 n=i; 296 ms= &(p[ n]); n+=i+j; 297 key= &(p[ n]); n+=j+k; 298 iv= &(p[ n]); n+=k; 299 er1= &(s->s3->server_random[0]); 300 er2= &(s->s3->client_random[0]); 301 } 302 303 if (n > s->s3->tmp.key_block_length) 304 { 305 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 306 goto err2; 307 } 308 309 EVP_MD_CTX_init(&md); 310 memcpy(mac_secret,ms,i); 311 if (is_exp) 312 { 313 /* In here I set both the read and write key/iv to the 314 * same value since only the correct one will be used :-). 315 */ 316 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 317 EVP_DigestUpdate(&md,key,j); 318 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 319 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 320 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 321 key= &(exp_key[0]); 322 323 if (k > 0) 324 { 325 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 326 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 327 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 328 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 329 iv= &(exp_iv[0]); 330 } 331 } 332 333 s->session->key_arg_length=0; 334 335 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 336 337 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 338 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 339 EVP_MD_CTX_cleanup(&md); 340 return(1); 341err: 342 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 343err2: 344 return(0); 345 } 346 347int ssl3_setup_key_block(SSL *s) 348 { 349 unsigned char *p; 350 const EVP_CIPHER *c; 351 const EVP_MD *hash; 352 int num; 353 int ret = 0; 354 SSL_COMP *comp; 355 356 if (s->s3->tmp.key_block_length != 0) 357 return(1); 358 359 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 360 { 361 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 362 return(0); 363 } 364 365 s->s3->tmp.new_sym_enc=c; 366 s->s3->tmp.new_hash=hash; 367 s->s3->tmp.new_compression=comp; 368 369 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 370 num*=2; 371 372 ssl3_cleanup_key_block(s); 373 374 if ((p=OPENSSL_malloc(num)) == NULL) 375 goto err; 376 377 s->s3->tmp.key_block_length=num; 378 s->s3->tmp.key_block=p; 379 380 ret = ssl3_generate_key_block(s,p,num); 381 382 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 383 { 384 /* enable vulnerability countermeasure for CBC ciphers with 385 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 386 */ 387 s->s3->need_empty_fragments = 1; 388 389 if (s->session->cipher != NULL) 390 { 391 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 392 s->s3->need_empty_fragments = 0; 393 394#ifndef OPENSSL_NO_RC4 395 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 396 s->s3->need_empty_fragments = 0; 397#endif 398 } 399 } 400 401 return ret; 402 403err: 404 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 405 return(0); 406 } 407 408void ssl3_cleanup_key_block(SSL *s) 409 { 410 if (s->s3->tmp.key_block != NULL) 411 { 412 OPENSSL_cleanse(s->s3->tmp.key_block, 413 s->s3->tmp.key_block_length); 414 OPENSSL_free(s->s3->tmp.key_block); 415 s->s3->tmp.key_block=NULL; 416 } 417 s->s3->tmp.key_block_length=0; 418 } 419 420int ssl3_enc(SSL *s, int send) 421 { 422 SSL3_RECORD *rec; 423 EVP_CIPHER_CTX *ds; 424 unsigned long l; 425 int bs,i; 426 const EVP_CIPHER *enc; 427 428 if (send) 429 { 430 ds=s->enc_write_ctx; 431 rec= &(s->s3->wrec); 432 if (s->enc_write_ctx == NULL) 433 enc=NULL; 434 else 435 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 436 } 437 else 438 { 439 ds=s->enc_read_ctx; 440 rec= &(s->s3->rrec); 441 if (s->enc_read_ctx == NULL) 442 enc=NULL; 443 else 444 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 445 } 446 447 if ((s->session == NULL) || (ds == NULL) || 448 (enc == NULL)) 449 { 450 memmove(rec->data,rec->input,rec->length); 451 rec->input=rec->data; 452 } 453 else 454 { 455 l=rec->length; 456 bs=EVP_CIPHER_block_size(ds->cipher); 457 458 /* COMPRESS */ 459 460 if ((bs != 1) && send) 461 { 462 i=bs-((int)l%bs); 463 464 /* we need to add 'i-1' padding bytes */ 465 l+=i; 466 rec->length+=i; 467 rec->input[l-1]=(i-1); 468 } 469 470 if (!send) 471 { 472 if (l == 0 || l%bs != 0) 473 { 474 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 475 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 476 return 0; 477 } 478 /* otherwise, rec->length >= bs */ 479 } 480 481 EVP_Cipher(ds,rec->data,rec->input,l); 482 483 if ((bs != 1) && !send) 484 { 485 i=rec->data[l-1]+1; 486 /* SSL 3.0 bounds the number of padding bytes by the block size; 487 * padding bytes (except the last one) are arbitrary */ 488 if (i > bs) 489 { 490 /* Incorrect padding. SSLerr() and ssl3_alert are done 491 * by caller: we don't want to reveal whether this is 492 * a decryption error or a MAC verification failure 493 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 494 return -1; 495 } 496 /* now i <= bs <= rec->length */ 497 rec->length-=i; 498 } 499 } 500 return(1); 501 } 502 503void ssl3_init_finished_mac(SSL *s) 504 { 505 EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1), 506 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 507 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); 508 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); 509 } 510 511void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 512 { 513 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); 514 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); 515 } 516 517int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) 518 { 519 return(ssl3_handshake_mac(s,ctx,NULL,0,p)); 520 } 521 522int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, 523 const char *sender, int len, unsigned char *p) 524 { 525 int ret; 526 527 ret=ssl3_handshake_mac(s,ctx1,sender,len,p); 528 p+=ret; 529 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); 530 return(ret); 531 } 532 533static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 534 const char *sender, int len, unsigned char *p) 535 { 536 unsigned int ret; 537 int npad,n; 538 unsigned int i; 539 unsigned char md_buf[EVP_MAX_MD_SIZE]; 540 EVP_MD_CTX ctx; 541 542 EVP_MD_CTX_init(&ctx); 543 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 544 545 n=EVP_MD_CTX_size(&ctx); 546 npad=(48/n)*n; 547 548 if (sender != NULL) 549 EVP_DigestUpdate(&ctx,sender,len); 550 EVP_DigestUpdate(&ctx,s->session->master_key, 551 s->session->master_key_length); 552 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 553 EVP_DigestFinal_ex(&ctx,md_buf,&i); 554 555 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 556 EVP_DigestUpdate(&ctx,s->session->master_key, 557 s->session->master_key_length); 558 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 559 EVP_DigestUpdate(&ctx,md_buf,i); 560 EVP_DigestFinal_ex(&ctx,p,&ret); 561 562 EVP_MD_CTX_cleanup(&ctx); 563 564 return((int)ret); 565 } 566 567int ssl3_mac(SSL *ssl, unsigned char *md, int send) 568 { 569 SSL3_RECORD *rec; 570 unsigned char *mac_sec,*seq; 571 EVP_MD_CTX md_ctx; 572 const EVP_MD *hash; 573 unsigned char *p,rec_char; 574 unsigned int md_size; 575 int npad,i; 576 577 if (send) 578 { 579 rec= &(ssl->s3->wrec); 580 mac_sec= &(ssl->s3->write_mac_secret[0]); 581 seq= &(ssl->s3->write_sequence[0]); 582 hash=ssl->write_hash; 583 } 584 else 585 { 586 rec= &(ssl->s3->rrec); 587 mac_sec= &(ssl->s3->read_mac_secret[0]); 588 seq= &(ssl->s3->read_sequence[0]); 589 hash=ssl->read_hash; 590 } 591 592 md_size=EVP_MD_size(hash); 593 npad=(48/md_size)*md_size; 594 595 /* Chop the digest off the end :-) */ 596 EVP_MD_CTX_init(&md_ctx); 597 598 EVP_DigestInit_ex( &md_ctx,hash, NULL); 599 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 600 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 601 EVP_DigestUpdate(&md_ctx,seq,8); 602 rec_char=rec->type; 603 EVP_DigestUpdate(&md_ctx,&rec_char,1); 604 p=md; 605 s2n(rec->length,p); 606 EVP_DigestUpdate(&md_ctx,md,2); 607 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 608 EVP_DigestFinal_ex( &md_ctx,md,NULL); 609 610 EVP_DigestInit_ex( &md_ctx,hash, NULL); 611 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 612 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 613 EVP_DigestUpdate(&md_ctx,md,md_size); 614 EVP_DigestFinal_ex( &md_ctx,md,&md_size); 615 616 EVP_MD_CTX_cleanup(&md_ctx); 617 618 for (i=7; i>=0; i--) 619 { 620 ++seq[i]; 621 if (seq[i] != 0) break; 622 } 623 624 return(md_size); 625 } 626 627int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 628 int len) 629 { 630 static const unsigned char *salt[3]={ 631#ifndef CHARSET_EBCDIC 632 (const unsigned char *)"A", 633 (const unsigned char *)"BB", 634 (const unsigned char *)"CCC", 635#else 636 (const unsigned char *)"\x41", 637 (const unsigned char *)"\x42\x42", 638 (const unsigned char *)"\x43\x43\x43", 639#endif 640 }; 641 unsigned char buf[EVP_MAX_MD_SIZE]; 642 EVP_MD_CTX ctx; 643 int i,ret=0; 644 unsigned int n; 645 646 EVP_MD_CTX_init(&ctx); 647 EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 648 for (i=0; i<3; i++) 649 { 650 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 651 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 652 EVP_DigestUpdate(&ctx,p,len); 653 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 654 SSL3_RANDOM_SIZE); 655 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 656 SSL3_RANDOM_SIZE); 657 EVP_DigestFinal_ex(&ctx,buf,&n); 658 659 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 660 EVP_DigestUpdate(&ctx,p,len); 661 EVP_DigestUpdate(&ctx,buf,n); 662 EVP_DigestFinal_ex(&ctx,out,&n); 663 out+=n; 664 ret+=n; 665 } 666 EVP_MD_CTX_cleanup(&ctx); 667 return(ret); 668 } 669 670int ssl3_alert_code(int code) 671 { 672 switch (code) 673 { 674 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 675 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 676 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 677 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 678 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 679 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 680 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 681 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 682 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 683 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 684 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 685 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 686 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 687 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 688 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 689 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 690 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 691 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 692 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 693 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 694 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 695 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 696 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 697 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 698 default: return(-1); 699 } 700 } 701 702