1 /* ssl/t1_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 <openssl/comp.h> 114 #include <openssl/md5.h> 115 #include <openssl/sha.h> 116 #include <openssl/evp.h> 117 #include <openssl/hmac.h> 118 #include "ssl_locl.h" 119 120 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 121 int sec_len, unsigned char *seed, int seed_len, 122 unsigned char *out, int olen) 123 { 124 int chunk,n; 125 unsigned int j; 126 HMAC_CTX ctx; 127 HMAC_CTX ctx_tmp; 128 unsigned char A1[HMAC_MAX_MD_CBLOCK]; 129 unsigned int A1_len; 130 131 chunk=EVP_MD_size(md); 132 133 HMAC_Init(&ctx,sec,sec_len,md); 134 HMAC_Update(&ctx,seed,seed_len); 135 HMAC_Final(&ctx,A1,&A1_len); 136 137 n=0; 138 for (;;) 139 { 140 HMAC_Init(&ctx,NULL,0,NULL); /* re-init */ 141 HMAC_Update(&ctx,A1,A1_len); 142 memcpy(&ctx_tmp,&ctx,sizeof(ctx)); /* Copy for A2 */ /* not needed for last one */ 143 HMAC_Update(&ctx,seed,seed_len); 144 145 if (olen > chunk) 146 { 147 HMAC_Final(&ctx,out,&j); 148 out+=j; 149 olen-=j; 150 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */ 151 } 152 else /* last one */ 153 { 154 HMAC_Final(&ctx,A1,&A1_len); 155 memcpy(out,A1,olen); 156 break; 157 } 158 } 159 HMAC_cleanup(&ctx); 160 HMAC_cleanup(&ctx_tmp); 161 memset(A1,0,sizeof(A1)); 162 } 163 164 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1, 165 unsigned char *label, int label_len, 166 const unsigned char *sec, int slen, unsigned char *out1, 167 unsigned char *out2, int olen) 168 { 169 int len,i; 170 const unsigned char *S1,*S2; 171 172 len=slen/2; 173 S1=sec; 174 S2= &(sec[len]); 175 len+=(slen&1); /* add for odd, make longer */ 176 177 178 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen); 179 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen); 180 181 for (i=0; i<olen; i++) 182 out1[i]^=out2[i]; 183 } 184 185 static void tls1_generate_key_block(SSL *s, unsigned char *km, 186 unsigned char *tmp, int num) 187 { 188 unsigned char *p; 189 unsigned char buf[SSL3_RANDOM_SIZE*2+ 190 TLS_MD_MAX_CONST_SIZE]; 191 p=buf; 192 193 memcpy(p,TLS_MD_KEY_EXPANSION_CONST, 194 TLS_MD_KEY_EXPANSION_CONST_SIZE); 195 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE; 196 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 197 p+=SSL3_RANDOM_SIZE; 198 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 199 p+=SSL3_RANDOM_SIZE; 200 201 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf), 202 s->session->master_key,s->session->master_key_length, 203 km,tmp,num); 204 } 205 206 int tls1_change_cipher_state(SSL *s, int which) 207 { 208 static const unsigned char empty[]=""; 209 unsigned char *p,*key_block,*mac_secret; 210 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+ 211 SSL3_RANDOM_SIZE*2]; 212 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 213 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 214 unsigned char iv1[EVP_MAX_IV_LENGTH*2]; 215 unsigned char iv2[EVP_MAX_IV_LENGTH*2]; 216 unsigned char *ms,*key,*iv,*er1,*er2; 217 int client_write; 218 EVP_CIPHER_CTX *dd; 219 const EVP_CIPHER *c; 220 const SSL_COMP *comp; 221 const EVP_MD *m; 222 int _exp,n,i,j,k,exp_label_len,cl; 223 224 _exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 225 c=s->s3->tmp.new_sym_enc; 226 m=s->s3->tmp.new_hash; 227 comp=s->s3->tmp.new_compression; 228 key_block=s->s3->tmp.key_block; 229 230 if (which & SSL3_CC_READ) 231 { 232 if ((s->enc_read_ctx == NULL) && 233 ((s->enc_read_ctx=(EVP_CIPHER_CTX *) 234 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 235 goto err; 236 dd= s->enc_read_ctx; 237 s->read_hash=m; 238 if (s->expand != NULL) 239 { 240 COMP_CTX_free(s->expand); 241 s->expand=NULL; 242 } 243 if (comp != NULL) 244 { 245 s->expand=COMP_CTX_new(comp->method); 246 if (s->expand == NULL) 247 { 248 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 249 goto err2; 250 } 251 if (s->s3->rrec.comp == NULL) 252 s->s3->rrec.comp=(unsigned char *) 253 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 254 if (s->s3->rrec.comp == NULL) 255 goto err; 256 } 257 memset(&(s->s3->read_sequence[0]),0,8); 258 mac_secret= &(s->s3->read_mac_secret[0]); 259 } 260 else 261 { 262 if ((s->enc_write_ctx == NULL) && 263 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 264 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 265 goto err; 266 dd= s->enc_write_ctx; 267 s->write_hash=m; 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->method); 276 if (s->compress == NULL) 277 { 278 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 279 goto err2; 280 } 281 } 282 memset(&(s->s3->write_sequence[0]),0,8); 283 mac_secret= &(s->s3->write_mac_secret[0]); 284 } 285 286 EVP_CIPHER_CTX_init(dd); 287 288 p=s->s3->tmp.key_block; 289 i=EVP_MD_size(m); 290 cl=EVP_CIPHER_key_length(c); 291 j=_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 292 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 293 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 294 k=EVP_CIPHER_iv_length(c); 295 er1= &(s->s3->client_random[0]); 296 er2= &(s->s3->server_random[0]); 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 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 304 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 305 client_write=1; 306 } 307 else 308 { 309 n=i; 310 ms= &(p[ n]); n+=i+j; 311 key= &(p[ n]); n+=j+k; 312 iv= &(p[ n]); n+=k; 313 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 314 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 315 client_write=0; 316 } 317 318 if (n > s->s3->tmp.key_block_length) 319 { 320 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_INTERNAL_ERROR); 321 goto err2; 322 } 323 324 memcpy(mac_secret,ms,i); 325 #ifdef TLS_DEBUG 326 printf("which = %04X\nmac key=",which); 327 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); } 328 #endif 329 if (_exp) 330 { 331 /* In here I set both the read and write key/iv to the 332 * same value since only the correct one will be used :-). 333 */ 334 p=buf; 335 memcpy(p,exp_label,exp_label_len); 336 p+=exp_label_len; 337 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 338 p+=SSL3_RANDOM_SIZE; 339 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 340 p+=SSL3_RANDOM_SIZE; 341 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j, 342 tmp1,tmp2,EVP_CIPHER_key_length(c)); 343 key=tmp1; 344 345 if (k > 0) 346 { 347 p=buf; 348 memcpy(p,TLS_MD_IV_BLOCK_CONST, 349 TLS_MD_IV_BLOCK_CONST_SIZE); 350 p+=TLS_MD_IV_BLOCK_CONST_SIZE; 351 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 352 p+=SSL3_RANDOM_SIZE; 353 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 354 p+=SSL3_RANDOM_SIZE; 355 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0, 356 iv1,iv2,k*2); 357 if (client_write) 358 iv=iv1; 359 else 360 iv= &(iv1[k]); 361 } 362 } 363 364 s->session->key_arg_length=0; 365 366 EVP_CipherInit(dd,c,key,iv,(which & SSL3_CC_WRITE)); 367 #ifdef TLS_DEBUG 368 printf("which = %04X\nkey=",which); 369 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); } 370 printf("\niv="); 371 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); } 372 printf("\n"); 373 #endif 374 375 memset(tmp1,0,sizeof(tmp1)); 376 memset(tmp2,0,sizeof(tmp1)); 377 memset(iv1,0,sizeof(iv1)); 378 memset(iv2,0,sizeof(iv2)); 379 return(1); 380 err: 381 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 382 err2: 383 return(0); 384 } 385 386 int tls1_setup_key_block(SSL *s) 387 { 388 unsigned char *p1,*p2; 389 const EVP_CIPHER *c; 390 const EVP_MD *hash; 391 int num; 392 SSL_COMP *comp; 393 394 if (s->s3->tmp.key_block_length != 0) 395 return(1); 396 397 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 398 { 399 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 400 return(0); 401 } 402 403 s->s3->tmp.new_sym_enc=c; 404 s->s3->tmp.new_hash=hash; 405 406 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 407 num*=2; 408 409 ssl3_cleanup_key_block(s); 410 411 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 412 goto err; 413 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 414 goto err; 415 416 s->s3->tmp.key_block_length=num; 417 s->s3->tmp.key_block=p1; 418 419 420 #ifdef TLS_DEBUG 421 printf("client random\n"); 422 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 423 printf("server random\n"); 424 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 425 printf("pre-master\n"); 426 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 427 #endif 428 tls1_generate_key_block(s,p1,p2,num); 429 memset(p2,0,num); 430 OPENSSL_free(p2); 431 #ifdef TLS_DEBUG 432 printf("\nkey block\n"); 433 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 434 #endif 435 436 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 437 { 438 /* enable vulnerability countermeasure for CBC ciphers with 439 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 440 */ 441 s->s3->need_empty_fragments = 1; 442 443 if (s->session->cipher != NULL) 444 { 445 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 446 s->s3->need_empty_fragments = 0; 447 448 #ifndef NO_RC4 449 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 450 s->s3->need_empty_fragments = 0; 451 #endif 452 } 453 } 454 455 return(1); 456 err: 457 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 458 return(0); 459 } 460 461 int tls1_enc(SSL *s, int send) 462 { 463 SSL3_RECORD *rec; 464 EVP_CIPHER_CTX *ds; 465 unsigned long l; 466 int bs,i,ii,j,k,n=0; 467 const EVP_CIPHER *enc; 468 469 if (send) 470 { 471 if (s->write_hash != NULL) 472 n=EVP_MD_size(s->write_hash); 473 ds=s->enc_write_ctx; 474 rec= &(s->s3->wrec); 475 if (s->enc_write_ctx == NULL) 476 enc=NULL; 477 else 478 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 479 } 480 else 481 { 482 if (s->read_hash != NULL) 483 n=EVP_MD_size(s->read_hash); 484 ds=s->enc_read_ctx; 485 rec= &(s->s3->rrec); 486 if (s->enc_read_ctx == NULL) 487 enc=NULL; 488 else 489 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 490 } 491 492 if ((s->session == NULL) || (ds == NULL) || 493 (enc == NULL)) 494 { 495 memmove(rec->data,rec->input,rec->length); 496 rec->input=rec->data; 497 } 498 else 499 { 500 l=rec->length; 501 bs=EVP_CIPHER_block_size(ds->cipher); 502 503 if ((bs != 1) && send) 504 { 505 i=bs-((int)l%bs); 506 507 /* Add weird padding of upto 256 bytes */ 508 509 /* we need to add 'i' padding bytes of value j */ 510 j=i-1; 511 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 512 { 513 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 514 j++; 515 } 516 for (k=(int)l; k<(int)(l+i); k++) 517 rec->input[k]=j; 518 l+=i; 519 rec->length+=i; 520 } 521 522 if (!send) 523 { 524 if (l == 0 || l%bs != 0) 525 { 526 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 527 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 528 return 0; 529 } 530 } 531 532 EVP_Cipher(ds,rec->data,rec->input,l); 533 534 if ((bs != 1) && !send) 535 { 536 ii=i=rec->data[l-1]; /* padding_length */ 537 i++; 538 if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) 539 { 540 /* First packet is even in size, so check */ 541 if ((memcmp(s->s3->read_sequence, 542 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) 543 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; 544 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 545 i--; 546 } 547 /* TLS 1.0 does not bound the number of padding bytes by the block size. 548 * All of them must have value 'padding_length'. */ 549 if (i > (int)rec->length) 550 { 551 /* Incorrect padding. SSLerr() and ssl3_alert are done 552 * by caller: we don't want to reveal whether this is 553 * a decryption error or a MAC verification failure 554 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 555 return -1; 556 } 557 for (j=(int)(l-i); j<(int)l; j++) 558 { 559 if (rec->data[j] != ii) 560 { 561 /* Incorrect padding */ 562 return -1; 563 } 564 } 565 rec->length-=i; 566 } 567 } 568 return(1); 569 } 570 571 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out) 572 { 573 unsigned int ret; 574 EVP_MD_CTX ctx; 575 576 EVP_MD_CTX_copy(&ctx,in_ctx); 577 EVP_DigestFinal(&ctx,out,&ret); 578 return((int)ret); 579 } 580 581 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx, 582 const char *str, int slen, unsigned char *out) 583 { 584 unsigned int i; 585 EVP_MD_CTX ctx; 586 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 587 unsigned char *q,buf2[12]; 588 589 q=buf; 590 memcpy(q,str,slen); 591 q+=slen; 592 593 EVP_MD_CTX_copy(&ctx,in1_ctx); 594 EVP_DigestFinal(&ctx,q,&i); 595 q+=i; 596 EVP_MD_CTX_copy(&ctx,in2_ctx); 597 EVP_DigestFinal(&ctx,q,&i); 598 q+=i; 599 600 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf), 601 s->session->master_key,s->session->master_key_length, 602 out,buf2,12); 603 memset(&ctx,0,sizeof(EVP_MD_CTX)); 604 605 return((int)12); 606 } 607 608 int tls1_mac(SSL *ssl, unsigned char *md, int send) 609 { 610 SSL3_RECORD *rec; 611 unsigned char *mac_sec,*seq; 612 const EVP_MD *hash; 613 unsigned int md_size; 614 int i; 615 HMAC_CTX hmac; 616 unsigned char buf[5]; 617 618 if (send) 619 { 620 rec= &(ssl->s3->wrec); 621 mac_sec= &(ssl->s3->write_mac_secret[0]); 622 seq= &(ssl->s3->write_sequence[0]); 623 hash=ssl->write_hash; 624 } 625 else 626 { 627 rec= &(ssl->s3->rrec); 628 mac_sec= &(ssl->s3->read_mac_secret[0]); 629 seq= &(ssl->s3->read_sequence[0]); 630 hash=ssl->read_hash; 631 } 632 633 md_size=EVP_MD_size(hash); 634 635 buf[0]=rec->type; 636 buf[1]=TLS1_VERSION_MAJOR; 637 buf[2]=TLS1_VERSION_MINOR; 638 buf[3]=rec->length>>8; 639 buf[4]=rec->length&0xff; 640 641 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 642 HMAC_Init(&hmac,mac_sec,EVP_MD_size(hash),hash); 643 HMAC_Update(&hmac,seq,8); 644 HMAC_Update(&hmac,buf,5); 645 HMAC_Update(&hmac,rec->input,rec->length); 646 HMAC_Final(&hmac,md,&md_size); 647 648 #ifdef TLS_DEBUG 649 printf("sec="); 650 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 651 printf("seq="); 652 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 653 printf("buf="); 654 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 655 printf("rec="); 656 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 657 #endif 658 659 for (i=7; i>=0; i--) 660 { 661 ++seq[i]; 662 if (seq[i] != 0) break; 663 } 664 665 #ifdef TLS_DEBUG 666 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 667 #endif 668 return(md_size); 669 } 670 671 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 672 int len) 673 { 674 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE]; 675 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 676 677 /* Setup the stuff to munge */ 678 memcpy(buf,TLS_MD_MASTER_SECRET_CONST, 679 TLS_MD_MASTER_SECRET_CONST_SIZE); 680 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]), 681 s->s3->client_random,SSL3_RANDOM_SIZE); 682 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]), 683 s->s3->server_random,SSL3_RANDOM_SIZE); 684 tls1_PRF(s->ctx->md5,s->ctx->sha1, 685 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len, 686 s->session->master_key,buff,SSL3_MASTER_SECRET_SIZE); 687 return(SSL3_MASTER_SECRET_SIZE); 688 } 689 690 int tls1_alert_code(int code) 691 { 692 switch (code) 693 { 694 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 695 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 696 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 697 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 698 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 699 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 700 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 701 case SSL_AD_NO_CERTIFICATE: return(-1); 702 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 703 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 704 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 705 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 706 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 707 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 708 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 709 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 710 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 711 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 712 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 713 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 714 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 715 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 716 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 717 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 718 default: return(-1); 719 } 720 } 721 722