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 "ssl_locl.h" 114 #include <openssl/comp.h> 115 #include <openssl/evp.h> 116 #include <openssl/hmac.h> 117 #include <openssl/md5.h> 118 #include <openssl/fips.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[EVP_MAX_MD_SIZE]; 129 unsigned int A1_len; 130 131 chunk=EVP_MD_size(md); 132 133 HMAC_CTX_init(&ctx); 134 HMAC_CTX_init(&ctx_tmp); 135 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL); 136 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL); 137 HMAC_Update(&ctx,seed,seed_len); 138 HMAC_Final(&ctx,A1,&A1_len); 139 140 n=0; 141 for (;;) 142 { 143 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */ 144 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */ 145 HMAC_Update(&ctx,A1,A1_len); 146 HMAC_Update(&ctx_tmp,A1,A1_len); 147 HMAC_Update(&ctx,seed,seed_len); 148 149 if (olen > chunk) 150 { 151 HMAC_Final(&ctx,out,&j); 152 out+=j; 153 olen-=j; 154 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */ 155 } 156 else /* last one */ 157 { 158 HMAC_Final(&ctx,A1,&A1_len); 159 memcpy(out,A1,olen); 160 break; 161 } 162 } 163 HMAC_CTX_cleanup(&ctx); 164 HMAC_CTX_cleanup(&ctx_tmp); 165 OPENSSL_cleanse(A1,sizeof(A1)); 166 } 167 168 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1, 169 unsigned char *label, int label_len, 170 const unsigned char *sec, int slen, unsigned char *out1, 171 unsigned char *out2, int olen) 172 { 173 int len,i; 174 const unsigned char *S1,*S2; 175 176 len=slen/2; 177 S1=sec; 178 S2= &(sec[len]); 179 len+=(slen&1); /* add for odd, make longer */ 180 181 #ifdef OPENSSL_FIPS 182 FIPS_allow_md5(1); 183 #endif 184 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen); 185 #ifdef OPENSSL_FIPS 186 FIPS_allow_md5(0); 187 #endif 188 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen); 189 190 for (i=0; i<olen; i++) 191 out1[i]^=out2[i]; 192 } 193 194 static void tls1_generate_key_block(SSL *s, unsigned char *km, 195 unsigned char *tmp, int num) 196 { 197 unsigned char *p; 198 unsigned char buf[SSL3_RANDOM_SIZE*2+ 199 TLS_MD_MAX_CONST_SIZE]; 200 p=buf; 201 202 memcpy(p,TLS_MD_KEY_EXPANSION_CONST, 203 TLS_MD_KEY_EXPANSION_CONST_SIZE); 204 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE; 205 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 206 p+=SSL3_RANDOM_SIZE; 207 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 208 p+=SSL3_RANDOM_SIZE; 209 210 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf), 211 s->session->master_key,s->session->master_key_length, 212 km,tmp,num); 213 #ifdef KSSL_DEBUG 214 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 215 s->session->master_key_length); 216 { 217 int i; 218 for (i=0; i < s->session->master_key_length; i++) 219 { 220 printf("%02X", s->session->master_key[i]); 221 } 222 printf("\n"); } 223 #endif /* KSSL_DEBUG */ 224 } 225 226 int tls1_change_cipher_state(SSL *s, int which) 227 { 228 static const unsigned char empty[]=""; 229 unsigned char *p,*key_block,*mac_secret; 230 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+ 231 SSL3_RANDOM_SIZE*2]; 232 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 233 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 234 unsigned char iv1[EVP_MAX_IV_LENGTH*2]; 235 unsigned char iv2[EVP_MAX_IV_LENGTH*2]; 236 unsigned char *ms,*key,*iv,*er1,*er2; 237 int client_write; 238 EVP_CIPHER_CTX *dd; 239 const EVP_CIPHER *c; 240 const SSL_COMP *comp; 241 const EVP_MD *m; 242 int is_export,n,i,j,k,exp_label_len,cl; 243 int reuse_dd = 0; 244 245 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 246 c=s->s3->tmp.new_sym_enc; 247 m=s->s3->tmp.new_hash; 248 comp=s->s3->tmp.new_compression; 249 key_block=s->s3->tmp.key_block; 250 251 #ifdef KSSL_DEBUG 252 printf("tls1_change_cipher_state(which= %d) w/\n", which); 253 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms, 254 comp); 255 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c); 256 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n", 257 c->nid,c->block_size,c->key_len,c->iv_len); 258 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length); 259 { 260 int i; 261 for (i=0; i<s->s3->tmp.key_block_length; i++) 262 printf("%02x", key_block[i]); printf("\n"); 263 } 264 #endif /* KSSL_DEBUG */ 265 266 if (which & SSL3_CC_READ) 267 { 268 if (s->enc_read_ctx != NULL) 269 reuse_dd = 1; 270 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 271 goto err; 272 dd= s->enc_read_ctx; 273 s->read_hash=m; 274 if (s->expand != NULL) 275 { 276 COMP_CTX_free(s->expand); 277 s->expand=NULL; 278 } 279 if (comp != NULL) 280 { 281 s->expand=COMP_CTX_new(comp->method); 282 if (s->expand == NULL) 283 { 284 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 285 goto err2; 286 } 287 if (s->s3->rrec.comp == NULL) 288 s->s3->rrec.comp=(unsigned char *) 289 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 290 if (s->s3->rrec.comp == NULL) 291 goto err; 292 } 293 memset(&(s->s3->read_sequence[0]),0,8); 294 mac_secret= &(s->s3->read_mac_secret[0]); 295 } 296 else 297 { 298 if (s->enc_write_ctx != NULL) 299 reuse_dd = 1; 300 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 301 goto err; 302 if ((s->enc_write_ctx == NULL) && 303 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 304 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 305 goto err; 306 dd= s->enc_write_ctx; 307 s->write_hash=m; 308 if (s->compress != NULL) 309 { 310 COMP_CTX_free(s->compress); 311 s->compress=NULL; 312 } 313 if (comp != NULL) 314 { 315 s->compress=COMP_CTX_new(comp->method); 316 if (s->compress == NULL) 317 { 318 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 319 goto err2; 320 } 321 } 322 memset(&(s->s3->write_sequence[0]),0,8); 323 mac_secret= &(s->s3->write_mac_secret[0]); 324 } 325 326 if (reuse_dd) 327 EVP_CIPHER_CTX_cleanup(dd); 328 EVP_CIPHER_CTX_init(dd); 329 330 p=s->s3->tmp.key_block; 331 i=EVP_MD_size(m); 332 cl=EVP_CIPHER_key_length(c); 333 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 334 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 335 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 336 k=EVP_CIPHER_iv_length(c); 337 er1= &(s->s3->client_random[0]); 338 er2= &(s->s3->server_random[0]); 339 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 340 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 341 { 342 ms= &(p[ 0]); n=i+i; 343 key= &(p[ n]); n+=j+j; 344 iv= &(p[ n]); n+=k+k; 345 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 346 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 347 client_write=1; 348 } 349 else 350 { 351 n=i; 352 ms= &(p[ n]); n+=i+j; 353 key= &(p[ n]); n+=j+k; 354 iv= &(p[ n]); n+=k; 355 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 356 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 357 client_write=0; 358 } 359 360 if (n > s->s3->tmp.key_block_length) 361 { 362 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 363 goto err2; 364 } 365 366 memcpy(mac_secret,ms,i); 367 #ifdef TLS_DEBUG 368 printf("which = %04X\nmac key=",which); 369 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); } 370 #endif 371 if (is_export) 372 { 373 /* In here I set both the read and write key/iv to the 374 * same value since only the correct one will be used :-). 375 */ 376 p=buf; 377 memcpy(p,exp_label,exp_label_len); 378 p+=exp_label_len; 379 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 380 p+=SSL3_RANDOM_SIZE; 381 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 382 p+=SSL3_RANDOM_SIZE; 383 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j, 384 tmp1,tmp2,EVP_CIPHER_key_length(c)); 385 key=tmp1; 386 387 if (k > 0) 388 { 389 p=buf; 390 memcpy(p,TLS_MD_IV_BLOCK_CONST, 391 TLS_MD_IV_BLOCK_CONST_SIZE); 392 p+=TLS_MD_IV_BLOCK_CONST_SIZE; 393 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 394 p+=SSL3_RANDOM_SIZE; 395 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 396 p+=SSL3_RANDOM_SIZE; 397 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0, 398 iv1,iv2,k*2); 399 if (client_write) 400 iv=iv1; 401 else 402 iv= &(iv1[k]); 403 } 404 } 405 406 s->session->key_arg_length=0; 407 #ifdef KSSL_DEBUG 408 { 409 int i; 410 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n"); 411 printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]); 412 printf("\n"); 413 printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]); 414 printf("\n"); 415 } 416 #endif /* KSSL_DEBUG */ 417 418 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 419 #ifdef TLS_DEBUG 420 printf("which = %04X\nkey=",which); 421 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); } 422 printf("\niv="); 423 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); } 424 printf("\n"); 425 #endif 426 427 OPENSSL_cleanse(tmp1,sizeof(tmp1)); 428 OPENSSL_cleanse(tmp2,sizeof(tmp1)); 429 OPENSSL_cleanse(iv1,sizeof(iv1)); 430 OPENSSL_cleanse(iv2,sizeof(iv2)); 431 return(1); 432 err: 433 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 434 err2: 435 return(0); 436 } 437 438 int tls1_setup_key_block(SSL *s) 439 { 440 unsigned char *p1,*p2; 441 const EVP_CIPHER *c; 442 const EVP_MD *hash; 443 int num; 444 SSL_COMP *comp; 445 446 #ifdef KSSL_DEBUG 447 printf ("tls1_setup_key_block()\n"); 448 #endif /* KSSL_DEBUG */ 449 450 if (s->s3->tmp.key_block_length != 0) 451 return(1); 452 453 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 454 { 455 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 456 return(0); 457 } 458 459 s->s3->tmp.new_sym_enc=c; 460 s->s3->tmp.new_hash=hash; 461 462 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 463 num*=2; 464 465 ssl3_cleanup_key_block(s); 466 467 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 468 goto err; 469 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 470 goto err; 471 472 s->s3->tmp.key_block_length=num; 473 s->s3->tmp.key_block=p1; 474 475 476 #ifdef TLS_DEBUG 477 printf("client random\n"); 478 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 479 printf("server random\n"); 480 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 481 printf("pre-master\n"); 482 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 483 #endif 484 tls1_generate_key_block(s,p1,p2,num); 485 OPENSSL_cleanse(p2,num); 486 OPENSSL_free(p2); 487 #ifdef TLS_DEBUG 488 printf("\nkey block\n"); 489 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 490 #endif 491 492 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 493 { 494 /* enable vulnerability countermeasure for CBC ciphers with 495 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 496 */ 497 s->s3->need_empty_fragments = 1; 498 499 if (s->session->cipher != NULL) 500 { 501 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 502 s->s3->need_empty_fragments = 0; 503 504 #ifndef OPENSSL_NO_RC4 505 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 506 s->s3->need_empty_fragments = 0; 507 #endif 508 } 509 } 510 511 return(1); 512 err: 513 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 514 return(0); 515 } 516 517 int tls1_enc(SSL *s, int send) 518 { 519 SSL3_RECORD *rec; 520 EVP_CIPHER_CTX *ds; 521 unsigned long l; 522 int bs,i,ii,j,k,n=0; 523 const EVP_CIPHER *enc; 524 525 if (send) 526 { 527 if (s->write_hash != NULL) 528 n=EVP_MD_size(s->write_hash); 529 ds=s->enc_write_ctx; 530 rec= &(s->s3->wrec); 531 if (s->enc_write_ctx == NULL) 532 enc=NULL; 533 else 534 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 535 } 536 else 537 { 538 if (s->read_hash != NULL) 539 n=EVP_MD_size(s->read_hash); 540 ds=s->enc_read_ctx; 541 rec= &(s->s3->rrec); 542 if (s->enc_read_ctx == NULL) 543 enc=NULL; 544 else 545 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 546 } 547 548 #ifdef KSSL_DEBUG 549 printf("tls1_enc(%d)\n", send); 550 #endif /* KSSL_DEBUG */ 551 552 if ((s->session == NULL) || (ds == NULL) || 553 (enc == NULL)) 554 { 555 memmove(rec->data,rec->input,rec->length); 556 rec->input=rec->data; 557 } 558 else 559 { 560 l=rec->length; 561 bs=EVP_CIPHER_block_size(ds->cipher); 562 563 if ((bs != 1) && send) 564 { 565 i=bs-((int)l%bs); 566 567 /* Add weird padding of upto 256 bytes */ 568 569 /* we need to add 'i' padding bytes of value j */ 570 j=i-1; 571 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 572 { 573 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 574 j++; 575 } 576 for (k=(int)l; k<(int)(l+i); k++) 577 rec->input[k]=j; 578 l+=i; 579 rec->length+=i; 580 } 581 582 #ifdef KSSL_DEBUG 583 { 584 unsigned long ui; 585 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 586 ds,rec->data,rec->input,l); 587 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", 588 ds->buf_len, ds->cipher->key_len, 589 DES_KEY_SZ, DES_SCHEDULE_SZ, 590 ds->cipher->iv_len); 591 printf("\t\tIV: "); 592 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); 593 printf("\n"); 594 printf("\trec->input="); 595 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); 596 printf("\n"); 597 } 598 #endif /* KSSL_DEBUG */ 599 600 if (!send) 601 { 602 if (l == 0 || l%bs != 0) 603 { 604 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 605 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 606 return 0; 607 } 608 } 609 610 EVP_Cipher(ds,rec->data,rec->input,l); 611 612 #ifdef KSSL_DEBUG 613 { 614 unsigned long i; 615 printf("\trec->data="); 616 for (i=0; i<l; i++) 617 printf(" %02x", rec->data[i]); printf("\n"); 618 } 619 #endif /* KSSL_DEBUG */ 620 621 if ((bs != 1) && !send) 622 { 623 ii=i=rec->data[l-1]; /* padding_length */ 624 i++; 625 if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) 626 { 627 /* First packet is even in size, so check */ 628 if ((memcmp(s->s3->read_sequence, 629 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) 630 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; 631 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 632 i--; 633 } 634 /* TLS 1.0 does not bound the number of padding bytes by the block size. 635 * All of them must have value 'padding_length'. */ 636 if (i > (int)rec->length) 637 { 638 /* Incorrect padding. SSLerr() and ssl3_alert are done 639 * by caller: we don't want to reveal whether this is 640 * a decryption error or a MAC verification failure 641 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 642 return -1; 643 } 644 for (j=(int)(l-i); j<(int)l; j++) 645 { 646 if (rec->data[j] != ii) 647 { 648 /* Incorrect padding */ 649 return -1; 650 } 651 } 652 rec->length-=i; 653 } 654 } 655 return(1); 656 } 657 658 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out) 659 { 660 unsigned int ret; 661 EVP_MD_CTX ctx; 662 663 EVP_MD_CTX_init(&ctx); 664 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 665 #ifdef OPENSSL_FIPS 666 FIPS_allow_md5(1); 667 #endif 668 EVP_DigestFinal_ex(&ctx,out,&ret); 669 #ifdef OPENSSL_FIPS 670 FIPS_allow_md5(0); 671 #endif 672 EVP_MD_CTX_cleanup(&ctx); 673 return((int)ret); 674 } 675 676 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx, 677 const char *str, int slen, unsigned char *out) 678 { 679 unsigned int i; 680 EVP_MD_CTX ctx; 681 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 682 unsigned char *q,buf2[12]; 683 684 q=buf; 685 memcpy(q,str,slen); 686 q+=slen; 687 688 EVP_MD_CTX_init(&ctx); 689 EVP_MD_CTX_copy_ex(&ctx,in1_ctx); 690 #ifdef OPENSSL_FIPS 691 FIPS_allow_md5(1); 692 #endif 693 EVP_DigestFinal_ex(&ctx,q,&i); 694 #ifdef OPENSSL_FIPS 695 FIPS_allow_md5(0); 696 #endif 697 q+=i; 698 EVP_MD_CTX_copy_ex(&ctx,in2_ctx); 699 EVP_DigestFinal_ex(&ctx,q,&i); 700 q+=i; 701 702 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf), 703 s->session->master_key,s->session->master_key_length, 704 out,buf2,sizeof buf2); 705 EVP_MD_CTX_cleanup(&ctx); 706 707 return sizeof buf2; 708 } 709 710 int tls1_mac(SSL *ssl, unsigned char *md, int send) 711 { 712 SSL3_RECORD *rec; 713 unsigned char *mac_sec,*seq; 714 const EVP_MD *hash; 715 unsigned int md_size; 716 int i; 717 HMAC_CTX hmac; 718 unsigned char buf[5]; 719 720 if (send) 721 { 722 rec= &(ssl->s3->wrec); 723 mac_sec= &(ssl->s3->write_mac_secret[0]); 724 seq= &(ssl->s3->write_sequence[0]); 725 hash=ssl->write_hash; 726 } 727 else 728 { 729 rec= &(ssl->s3->rrec); 730 mac_sec= &(ssl->s3->read_mac_secret[0]); 731 seq= &(ssl->s3->read_sequence[0]); 732 hash=ssl->read_hash; 733 } 734 735 md_size=EVP_MD_size(hash); 736 737 buf[0]=rec->type; 738 buf[1]=TLS1_VERSION_MAJOR; 739 buf[2]=TLS1_VERSION_MINOR; 740 buf[3]=rec->length>>8; 741 buf[4]=rec->length&0xff; 742 743 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 744 HMAC_CTX_init(&hmac); 745 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL); 746 HMAC_Update(&hmac,seq,8); 747 HMAC_Update(&hmac,buf,5); 748 HMAC_Update(&hmac,rec->input,rec->length); 749 HMAC_Final(&hmac,md,&md_size); 750 HMAC_CTX_cleanup(&hmac); 751 752 #ifdef TLS_DEBUG 753 printf("sec="); 754 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 755 printf("seq="); 756 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 757 printf("buf="); 758 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 759 printf("rec="); 760 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 761 #endif 762 763 for (i=7; i>=0; i--) 764 { 765 ++seq[i]; 766 if (seq[i] != 0) break; 767 } 768 769 #ifdef TLS_DEBUG 770 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 771 #endif 772 return(md_size); 773 } 774 775 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 776 int len) 777 { 778 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE]; 779 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 780 781 #ifdef KSSL_DEBUG 782 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len); 783 #endif /* KSSL_DEBUG */ 784 785 /* Setup the stuff to munge */ 786 memcpy(buf,TLS_MD_MASTER_SECRET_CONST, 787 TLS_MD_MASTER_SECRET_CONST_SIZE); 788 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]), 789 s->s3->client_random,SSL3_RANDOM_SIZE); 790 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]), 791 s->s3->server_random,SSL3_RANDOM_SIZE); 792 tls1_PRF(s->ctx->md5,s->ctx->sha1, 793 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len, 794 s->session->master_key,buff,sizeof buff); 795 #ifdef KSSL_DEBUG 796 printf ("tls1_generate_master_secret() complete\n"); 797 #endif /* KSSL_DEBUG */ 798 return(SSL3_MASTER_SECRET_SIZE); 799 } 800 801 int tls1_alert_code(int code) 802 { 803 switch (code) 804 { 805 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 806 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 807 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 808 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 809 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 810 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 811 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 812 case SSL_AD_NO_CERTIFICATE: return(-1); 813 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 814 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 815 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 816 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 817 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 818 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 819 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 820 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 821 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 822 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 823 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 824 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 825 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 826 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 827 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 828 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 829 default: return(-1); 830 } 831 } 832 833