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> 116 117 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 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_init(&s1); 150 for (i=0; i<num; i+=MD5_DIGEST_LENGTH) 151 { 152 k++; 153 if (k > sizeof buf) 154 { 155 /* bug: 'buf' is too small for this ciphersuite */ 156 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); 157 return 0; 158 } 159 160 for (j=0; j<k; j++) 161 buf[j]=c; 162 c++; 163 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); 164 EVP_DigestUpdate(&s1,buf,k); 165 EVP_DigestUpdate(&s1,s->session->master_key, 166 s->session->master_key_length); 167 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); 168 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); 169 EVP_DigestFinal_ex(&s1,smd,NULL); 170 171 EVP_DigestInit_ex(&m5,EVP_md5(), NULL); 172 EVP_DigestUpdate(&m5,s->session->master_key, 173 s->session->master_key_length); 174 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); 175 if ((i+MD5_DIGEST_LENGTH) > num) 176 { 177 EVP_DigestFinal_ex(&m5,smd,NULL); 178 memcpy(km,smd,(num-i)); 179 } 180 else 181 EVP_DigestFinal_ex(&m5,km,NULL); 182 183 km+=MD5_DIGEST_LENGTH; 184 } 185 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); 186 EVP_MD_CTX_cleanup(&m5); 187 EVP_MD_CTX_cleanup(&s1); 188 return 1; 189 } 190 191 int ssl3_change_cipher_state(SSL *s, int which) 192 { 193 unsigned char *p,*key_block,*mac_secret; 194 unsigned char exp_key[EVP_MAX_KEY_LENGTH]; 195 unsigned char exp_iv[EVP_MAX_IV_LENGTH]; 196 unsigned char *ms,*key,*iv,*er1,*er2; 197 EVP_CIPHER_CTX *dd; 198 const EVP_CIPHER *c; 199 COMP_METHOD *comp; 200 const EVP_MD *m; 201 EVP_MD_CTX md; 202 int is_exp,n,i,j,k,cl; 203 int reuse_dd = 0; 204 205 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 206 c=s->s3->tmp.new_sym_enc; 207 m=s->s3->tmp.new_hash; 208 if (s->s3->tmp.new_compression == NULL) 209 comp=NULL; 210 else 211 comp=s->s3->tmp.new_compression->method; 212 key_block=s->s3->tmp.key_block; 213 214 if (which & SSL3_CC_READ) 215 { 216 if (s->enc_read_ctx != NULL) 217 reuse_dd = 1; 218 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 219 goto err; 220 dd= s->enc_read_ctx; 221 s->read_hash=m; 222 /* COMPRESS */ 223 if (s->expand != NULL) 224 { 225 COMP_CTX_free(s->expand); 226 s->expand=NULL; 227 } 228 if (comp != NULL) 229 { 230 s->expand=COMP_CTX_new(comp); 231 if (s->expand == NULL) 232 { 233 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 234 goto err2; 235 } 236 if (s->s3->rrec.comp == NULL) 237 s->s3->rrec.comp=(unsigned char *) 238 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); 239 if (s->s3->rrec.comp == NULL) 240 goto err; 241 } 242 memset(&(s->s3->read_sequence[0]),0,8); 243 mac_secret= &(s->s3->read_mac_secret[0]); 244 } 245 else 246 { 247 if (s->enc_write_ctx != NULL) 248 reuse_dd = 1; 249 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 250 goto err; 251 dd= s->enc_write_ctx; 252 s->write_hash=m; 253 /* COMPRESS */ 254 if (s->compress != NULL) 255 { 256 COMP_CTX_free(s->compress); 257 s->compress=NULL; 258 } 259 if (comp != NULL) 260 { 261 s->compress=COMP_CTX_new(comp); 262 if (s->compress == NULL) 263 { 264 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 265 goto err2; 266 } 267 } 268 memset(&(s->s3->write_sequence[0]),0,8); 269 mac_secret= &(s->s3->write_mac_secret[0]); 270 } 271 272 if (reuse_dd) 273 EVP_CIPHER_CTX_cleanup(dd); 274 EVP_CIPHER_CTX_init(dd); 275 276 p=s->s3->tmp.key_block; 277 i=EVP_MD_size(m); 278 cl=EVP_CIPHER_key_length(c); 279 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 280 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 281 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ 282 k=EVP_CIPHER_iv_length(c); 283 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 284 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 285 { 286 ms= &(p[ 0]); n=i+i; 287 key= &(p[ n]); n+=j+j; 288 iv= &(p[ n]); n+=k+k; 289 er1= &(s->s3->client_random[0]); 290 er2= &(s->s3->server_random[0]); 291 } 292 else 293 { 294 n=i; 295 ms= &(p[ n]); n+=i+j; 296 key= &(p[ n]); n+=j+k; 297 iv= &(p[ n]); n+=k; 298 er1= &(s->s3->server_random[0]); 299 er2= &(s->s3->client_random[0]); 300 } 301 302 if (n > s->s3->tmp.key_block_length) 303 { 304 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 305 goto err2; 306 } 307 308 EVP_MD_CTX_init(&md); 309 memcpy(mac_secret,ms,i); 310 if (is_exp) 311 { 312 /* In here I set both the read and write key/iv to the 313 * same value since only the correct one will be used :-). 314 */ 315 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 316 EVP_DigestUpdate(&md,key,j); 317 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 318 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 319 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); 320 key= &(exp_key[0]); 321 322 if (k > 0) 323 { 324 EVP_DigestInit_ex(&md,EVP_md5(), NULL); 325 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); 326 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); 327 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); 328 iv= &(exp_iv[0]); 329 } 330 } 331 332 s->session->key_arg_length=0; 333 334 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 335 336 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); 337 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); 338 EVP_MD_CTX_cleanup(&md); 339 return(1); 340 err: 341 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 342 err2: 343 return(0); 344 } 345 346 int ssl3_setup_key_block(SSL *s) 347 { 348 unsigned char *p; 349 const EVP_CIPHER *c; 350 const EVP_MD *hash; 351 int num; 352 int ret = 0; 353 SSL_COMP *comp; 354 355 if (s->s3->tmp.key_block_length != 0) 356 return(1); 357 358 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 359 { 360 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 361 return(0); 362 } 363 364 s->s3->tmp.new_sym_enc=c; 365 s->s3->tmp.new_hash=hash; 366 s->s3->tmp.new_compression=comp; 367 368 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 369 num*=2; 370 371 ssl3_cleanup_key_block(s); 372 373 if ((p=OPENSSL_malloc(num)) == NULL) 374 goto err; 375 376 s->s3->tmp.key_block_length=num; 377 s->s3->tmp.key_block=p; 378 379 ret = ssl3_generate_key_block(s,p,num); 380 381 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 382 { 383 /* enable vulnerability countermeasure for CBC ciphers with 384 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 385 */ 386 s->s3->need_empty_fragments = 1; 387 388 if (s->session->cipher != NULL) 389 { 390 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 391 s->s3->need_empty_fragments = 0; 392 393 #ifndef OPENSSL_NO_RC4 394 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 395 s->s3->need_empty_fragments = 0; 396 #endif 397 } 398 } 399 400 return ret; 401 402 err: 403 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 404 return(0); 405 } 406 407 void ssl3_cleanup_key_block(SSL *s) 408 { 409 if (s->s3->tmp.key_block != NULL) 410 { 411 OPENSSL_cleanse(s->s3->tmp.key_block, 412 s->s3->tmp.key_block_length); 413 OPENSSL_free(s->s3->tmp.key_block); 414 s->s3->tmp.key_block=NULL; 415 } 416 s->s3->tmp.key_block_length=0; 417 } 418 419 int ssl3_enc(SSL *s, int send) 420 { 421 SSL3_RECORD *rec; 422 EVP_CIPHER_CTX *ds; 423 unsigned long l; 424 int bs,i; 425 const EVP_CIPHER *enc; 426 427 if (send) 428 { 429 ds=s->enc_write_ctx; 430 rec= &(s->s3->wrec); 431 if (s->enc_write_ctx == NULL) 432 enc=NULL; 433 else 434 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 435 } 436 else 437 { 438 ds=s->enc_read_ctx; 439 rec= &(s->s3->rrec); 440 if (s->enc_read_ctx == NULL) 441 enc=NULL; 442 else 443 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 444 } 445 446 if ((s->session == NULL) || (ds == NULL) || 447 (enc == NULL)) 448 { 449 memmove(rec->data,rec->input,rec->length); 450 rec->input=rec->data; 451 } 452 else 453 { 454 l=rec->length; 455 bs=EVP_CIPHER_block_size(ds->cipher); 456 457 /* COMPRESS */ 458 459 if ((bs != 1) && send) 460 { 461 i=bs-((int)l%bs); 462 463 /* we need to add 'i-1' padding bytes */ 464 l+=i; 465 rec->length+=i; 466 rec->input[l-1]=(i-1); 467 } 468 469 if (!send) 470 { 471 if (l == 0 || l%bs != 0) 472 { 473 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 474 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 475 return 0; 476 } 477 /* otherwise, rec->length >= bs */ 478 } 479 480 EVP_Cipher(ds,rec->data,rec->input,l); 481 482 if ((bs != 1) && !send) 483 { 484 i=rec->data[l-1]+1; 485 /* SSL 3.0 bounds the number of padding bytes by the block size; 486 * padding bytes (except the last one) are arbitrary */ 487 if (i > bs) 488 { 489 /* Incorrect padding. SSLerr() and ssl3_alert are done 490 * by caller: we don't want to reveal whether this is 491 * a decryption error or a MAC verification failure 492 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 493 return -1; 494 } 495 /* now i <= bs <= rec->length */ 496 rec->length-=i; 497 } 498 } 499 return(1); 500 } 501 502 void ssl3_init_finished_mac(SSL *s) 503 { 504 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL); 505 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL); 506 } 507 508 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) 509 { 510 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len); 511 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len); 512 } 513 514 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p) 515 { 516 return(ssl3_handshake_mac(s,ctx,NULL,0,p)); 517 } 518 519 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2, 520 const char *sender, int len, unsigned char *p) 521 { 522 int ret; 523 524 ret=ssl3_handshake_mac(s,ctx1,sender,len,p); 525 p+=ret; 526 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p); 527 return(ret); 528 } 529 530 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx, 531 const char *sender, int len, unsigned char *p) 532 { 533 unsigned int ret; 534 int npad,n; 535 unsigned int i; 536 unsigned char md_buf[EVP_MAX_MD_SIZE]; 537 EVP_MD_CTX ctx; 538 539 EVP_MD_CTX_init(&ctx); 540 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 541 542 n=EVP_MD_CTX_size(&ctx); 543 npad=(48/n)*n; 544 545 if (sender != NULL) 546 EVP_DigestUpdate(&ctx,sender,len); 547 EVP_DigestUpdate(&ctx,s->session->master_key, 548 s->session->master_key_length); 549 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); 550 EVP_DigestFinal_ex(&ctx,md_buf,&i); 551 552 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); 553 EVP_DigestUpdate(&ctx,s->session->master_key, 554 s->session->master_key_length); 555 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); 556 EVP_DigestUpdate(&ctx,md_buf,i); 557 EVP_DigestFinal_ex(&ctx,p,&ret); 558 559 EVP_MD_CTX_cleanup(&ctx); 560 561 return((int)ret); 562 } 563 564 int ssl3_mac(SSL *ssl, unsigned char *md, int send) 565 { 566 SSL3_RECORD *rec; 567 unsigned char *mac_sec,*seq; 568 EVP_MD_CTX md_ctx; 569 const EVP_MD *hash; 570 unsigned char *p,rec_char; 571 unsigned int md_size; 572 int npad,i; 573 574 if (send) 575 { 576 rec= &(ssl->s3->wrec); 577 mac_sec= &(ssl->s3->write_mac_secret[0]); 578 seq= &(ssl->s3->write_sequence[0]); 579 hash=ssl->write_hash; 580 } 581 else 582 { 583 rec= &(ssl->s3->rrec); 584 mac_sec= &(ssl->s3->read_mac_secret[0]); 585 seq= &(ssl->s3->read_sequence[0]); 586 hash=ssl->read_hash; 587 } 588 589 md_size=EVP_MD_size(hash); 590 npad=(48/md_size)*md_size; 591 592 /* Chop the digest off the end :-) */ 593 EVP_MD_CTX_init(&md_ctx); 594 595 EVP_DigestInit_ex( &md_ctx,hash, NULL); 596 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 597 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); 598 EVP_DigestUpdate(&md_ctx,seq,8); 599 rec_char=rec->type; 600 EVP_DigestUpdate(&md_ctx,&rec_char,1); 601 p=md; 602 s2n(rec->length,p); 603 EVP_DigestUpdate(&md_ctx,md,2); 604 EVP_DigestUpdate(&md_ctx,rec->input,rec->length); 605 EVP_DigestFinal_ex( &md_ctx,md,NULL); 606 607 EVP_DigestInit_ex( &md_ctx,hash, NULL); 608 EVP_DigestUpdate(&md_ctx,mac_sec,md_size); 609 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); 610 EVP_DigestUpdate(&md_ctx,md,md_size); 611 EVP_DigestFinal_ex( &md_ctx,md,&md_size); 612 613 EVP_MD_CTX_cleanup(&md_ctx); 614 615 for (i=7; i>=0; i--) 616 { 617 ++seq[i]; 618 if (seq[i] != 0) break; 619 } 620 621 return(md_size); 622 } 623 624 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 625 int len) 626 { 627 static const unsigned char *salt[3]={ 628 #ifndef CHARSET_EBCDIC 629 (const unsigned char *)"A", 630 (const unsigned char *)"BB", 631 (const unsigned char *)"CCC", 632 #else 633 (const unsigned char *)"\x41", 634 (const unsigned char *)"\x42\x42", 635 (const unsigned char *)"\x43\x43\x43", 636 #endif 637 }; 638 unsigned char buf[EVP_MAX_MD_SIZE]; 639 EVP_MD_CTX ctx; 640 int i,ret=0; 641 unsigned int n; 642 643 EVP_MD_CTX_init(&ctx); 644 for (i=0; i<3; i++) 645 { 646 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); 647 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); 648 EVP_DigestUpdate(&ctx,p,len); 649 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), 650 SSL3_RANDOM_SIZE); 651 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), 652 SSL3_RANDOM_SIZE); 653 EVP_DigestFinal_ex(&ctx,buf,&n); 654 655 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); 656 EVP_DigestUpdate(&ctx,p,len); 657 EVP_DigestUpdate(&ctx,buf,n); 658 EVP_DigestFinal_ex(&ctx,out,&n); 659 out+=n; 660 ret+=n; 661 } 662 EVP_MD_CTX_cleanup(&ctx); 663 return(ret); 664 } 665 666 int ssl3_alert_code(int code) 667 { 668 switch (code) 669 { 670 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 671 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 672 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 673 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); 674 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); 675 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 676 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 677 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); 678 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 679 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 680 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 681 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 682 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 683 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 684 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); 685 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); 686 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 687 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 688 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); 689 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); 690 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); 691 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); 692 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); 693 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ 694 default: return(-1); 695 } 696 } 697 698