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> 118 119 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 120 int sec_len, unsigned char *seed, int seed_len, 121 unsigned char *out, int olen) 122 { 123 int chunk,n; 124 unsigned int j; 125 HMAC_CTX ctx; 126 HMAC_CTX ctx_tmp; 127 unsigned char A1[EVP_MAX_MD_SIZE]; 128 unsigned int A1_len; 129 130 chunk=EVP_MD_size(md); 131 132 HMAC_CTX_init(&ctx); 133 HMAC_CTX_init(&ctx_tmp); 134 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL); 135 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL); 136 HMAC_Update(&ctx,seed,seed_len); 137 HMAC_Final(&ctx,A1,&A1_len); 138 139 n=0; 140 for (;;) 141 { 142 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */ 143 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */ 144 HMAC_Update(&ctx,A1,A1_len); 145 HMAC_Update(&ctx_tmp,A1,A1_len); 146 HMAC_Update(&ctx,seed,seed_len); 147 148 if (olen > chunk) 149 { 150 HMAC_Final(&ctx,out,&j); 151 out+=j; 152 olen-=j; 153 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */ 154 } 155 else /* last one */ 156 { 157 HMAC_Final(&ctx,A1,&A1_len); 158 memcpy(out,A1,olen); 159 break; 160 } 161 } 162 HMAC_CTX_cleanup(&ctx); 163 HMAC_CTX_cleanup(&ctx_tmp); 164 OPENSSL_cleanse(A1,sizeof(A1)); 165 } 166 167 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1, 168 unsigned char *label, int label_len, 169 const unsigned char *sec, int slen, unsigned char *out1, 170 unsigned char *out2, int olen) 171 { 172 int len,i; 173 const unsigned char *S1,*S2; 174 175 len=slen/2; 176 S1=sec; 177 S2= &(sec[len]); 178 len+=(slen&1); /* add for odd, make longer */ 179 180 181 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen); 182 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen); 183 184 for (i=0; i<olen; i++) 185 out1[i]^=out2[i]; 186 } 187 188 static void tls1_generate_key_block(SSL *s, unsigned char *km, 189 unsigned char *tmp, int num) 190 { 191 unsigned char *p; 192 unsigned char buf[SSL3_RANDOM_SIZE*2+ 193 TLS_MD_MAX_CONST_SIZE]; 194 p=buf; 195 196 memcpy(p,TLS_MD_KEY_EXPANSION_CONST, 197 TLS_MD_KEY_EXPANSION_CONST_SIZE); 198 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE; 199 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 200 p+=SSL3_RANDOM_SIZE; 201 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 202 p+=SSL3_RANDOM_SIZE; 203 204 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf), 205 s->session->master_key,s->session->master_key_length, 206 km,tmp,num); 207 #ifdef KSSL_DEBUG 208 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 209 s->session->master_key_length); 210 { 211 int i; 212 for (i=0; i < s->session->master_key_length; i++) 213 { 214 printf("%02X", s->session->master_key[i]); 215 } 216 printf("\n"); } 217 #endif /* KSSL_DEBUG */ 218 } 219 220 int tls1_change_cipher_state(SSL *s, int which) 221 { 222 static const unsigned char empty[]=""; 223 unsigned char *p,*key_block,*mac_secret; 224 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+ 225 SSL3_RANDOM_SIZE*2]; 226 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 227 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 228 unsigned char iv1[EVP_MAX_IV_LENGTH*2]; 229 unsigned char iv2[EVP_MAX_IV_LENGTH*2]; 230 unsigned char *ms,*key,*iv,*er1,*er2; 231 int client_write; 232 EVP_CIPHER_CTX *dd; 233 const EVP_CIPHER *c; 234 const SSL_COMP *comp; 235 const EVP_MD *m; 236 int is_export,n,i,j,k,exp_label_len,cl; 237 int reuse_dd = 0; 238 239 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 240 c=s->s3->tmp.new_sym_enc; 241 m=s->s3->tmp.new_hash; 242 comp=s->s3->tmp.new_compression; 243 key_block=s->s3->tmp.key_block; 244 245 #ifdef KSSL_DEBUG 246 printf("tls1_change_cipher_state(which= %d) w/\n", which); 247 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms, 248 comp); 249 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c); 250 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n", 251 c->nid,c->block_size,c->key_len,c->iv_len); 252 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length); 253 { 254 int i; 255 for (i=0; i<s->s3->tmp.key_block_length; i++) 256 printf("%02x", key_block[i]); printf("\n"); 257 } 258 #endif /* KSSL_DEBUG */ 259 260 if (which & SSL3_CC_READ) 261 { 262 if (s->enc_read_ctx != NULL) 263 reuse_dd = 1; 264 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 265 goto err; 266 dd= s->enc_read_ctx; 267 s->read_hash=m; 268 if (s->expand != NULL) 269 { 270 COMP_CTX_free(s->expand); 271 s->expand=NULL; 272 } 273 if (comp != NULL) 274 { 275 s->expand=COMP_CTX_new(comp->method); 276 if (s->expand == NULL) 277 { 278 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 279 goto err2; 280 } 281 if (s->s3->rrec.comp == NULL) 282 s->s3->rrec.comp=(unsigned char *) 283 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 284 if (s->s3->rrec.comp == NULL) 285 goto err; 286 } 287 memset(&(s->s3->read_sequence[0]),0,8); 288 mac_secret= &(s->s3->read_mac_secret[0]); 289 } 290 else 291 { 292 if (s->enc_write_ctx != NULL) 293 reuse_dd = 1; 294 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 295 goto err; 296 if ((s->enc_write_ctx == NULL) && 297 ((s->enc_write_ctx=(EVP_CIPHER_CTX *) 298 OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)) 299 goto err; 300 dd= s->enc_write_ctx; 301 s->write_hash=m; 302 if (s->compress != NULL) 303 { 304 COMP_CTX_free(s->compress); 305 s->compress=NULL; 306 } 307 if (comp != NULL) 308 { 309 s->compress=COMP_CTX_new(comp->method); 310 if (s->compress == NULL) 311 { 312 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 313 goto err2; 314 } 315 } 316 memset(&(s->s3->write_sequence[0]),0,8); 317 mac_secret= &(s->s3->write_mac_secret[0]); 318 } 319 320 if (reuse_dd) 321 EVP_CIPHER_CTX_cleanup(dd); 322 EVP_CIPHER_CTX_init(dd); 323 324 p=s->s3->tmp.key_block; 325 i=EVP_MD_size(m); 326 cl=EVP_CIPHER_key_length(c); 327 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 328 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 329 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 330 k=EVP_CIPHER_iv_length(c); 331 er1= &(s->s3->client_random[0]); 332 er2= &(s->s3->server_random[0]); 333 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 334 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 335 { 336 ms= &(p[ 0]); n=i+i; 337 key= &(p[ n]); n+=j+j; 338 iv= &(p[ n]); n+=k+k; 339 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 340 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 341 client_write=1; 342 } 343 else 344 { 345 n=i; 346 ms= &(p[ n]); n+=i+j; 347 key= &(p[ n]); n+=j+k; 348 iv= &(p[ n]); n+=k; 349 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 350 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 351 client_write=0; 352 } 353 354 if (n > s->s3->tmp.key_block_length) 355 { 356 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 357 goto err2; 358 } 359 360 memcpy(mac_secret,ms,i); 361 #ifdef TLS_DEBUG 362 printf("which = %04X\nmac key=",which); 363 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); } 364 #endif 365 if (is_export) 366 { 367 /* In here I set both the read and write key/iv to the 368 * same value since only the correct one will be used :-). 369 */ 370 p=buf; 371 memcpy(p,exp_label,exp_label_len); 372 p+=exp_label_len; 373 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 374 p+=SSL3_RANDOM_SIZE; 375 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 376 p+=SSL3_RANDOM_SIZE; 377 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j, 378 tmp1,tmp2,EVP_CIPHER_key_length(c)); 379 key=tmp1; 380 381 if (k > 0) 382 { 383 p=buf; 384 memcpy(p,TLS_MD_IV_BLOCK_CONST, 385 TLS_MD_IV_BLOCK_CONST_SIZE); 386 p+=TLS_MD_IV_BLOCK_CONST_SIZE; 387 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 388 p+=SSL3_RANDOM_SIZE; 389 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 390 p+=SSL3_RANDOM_SIZE; 391 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0, 392 iv1,iv2,k*2); 393 if (client_write) 394 iv=iv1; 395 else 396 iv= &(iv1[k]); 397 } 398 } 399 400 s->session->key_arg_length=0; 401 #ifdef KSSL_DEBUG 402 { 403 int i; 404 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n"); 405 printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]); 406 printf("\n"); 407 printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]); 408 printf("\n"); 409 } 410 #endif /* KSSL_DEBUG */ 411 412 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 413 #ifdef TLS_DEBUG 414 printf("which = %04X\nkey=",which); 415 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); } 416 printf("\niv="); 417 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); } 418 printf("\n"); 419 #endif 420 421 OPENSSL_cleanse(tmp1,sizeof(tmp1)); 422 OPENSSL_cleanse(tmp2,sizeof(tmp1)); 423 OPENSSL_cleanse(iv1,sizeof(iv1)); 424 OPENSSL_cleanse(iv2,sizeof(iv2)); 425 return(1); 426 err: 427 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 428 err2: 429 return(0); 430 } 431 432 int tls1_setup_key_block(SSL *s) 433 { 434 unsigned char *p1,*p2; 435 const EVP_CIPHER *c; 436 const EVP_MD *hash; 437 int num; 438 SSL_COMP *comp; 439 440 #ifdef KSSL_DEBUG 441 printf ("tls1_setup_key_block()\n"); 442 #endif /* KSSL_DEBUG */ 443 444 if (s->s3->tmp.key_block_length != 0) 445 return(1); 446 447 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 448 { 449 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 450 return(0); 451 } 452 453 s->s3->tmp.new_sym_enc=c; 454 s->s3->tmp.new_hash=hash; 455 456 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 457 num*=2; 458 459 ssl3_cleanup_key_block(s); 460 461 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 462 goto err; 463 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 464 goto err; 465 466 s->s3->tmp.key_block_length=num; 467 s->s3->tmp.key_block=p1; 468 469 470 #ifdef TLS_DEBUG 471 printf("client random\n"); 472 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 473 printf("server random\n"); 474 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 475 printf("pre-master\n"); 476 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 477 #endif 478 tls1_generate_key_block(s,p1,p2,num); 479 OPENSSL_cleanse(p2,num); 480 OPENSSL_free(p2); 481 #ifdef TLS_DEBUG 482 printf("\nkey block\n"); 483 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 484 #endif 485 486 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 487 { 488 /* enable vulnerability countermeasure for CBC ciphers with 489 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 490 */ 491 s->s3->need_empty_fragments = 1; 492 493 if (s->session->cipher != NULL) 494 { 495 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 496 s->s3->need_empty_fragments = 0; 497 498 #ifndef OPENSSL_NO_RC4 499 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 500 s->s3->need_empty_fragments = 0; 501 #endif 502 } 503 } 504 505 return(1); 506 err: 507 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 508 return(0); 509 } 510 511 int tls1_enc(SSL *s, int send) 512 { 513 SSL3_RECORD *rec; 514 EVP_CIPHER_CTX *ds; 515 unsigned long l; 516 int bs,i,ii,j,k,n=0; 517 const EVP_CIPHER *enc; 518 519 if (send) 520 { 521 if (s->write_hash != NULL) 522 n=EVP_MD_size(s->write_hash); 523 ds=s->enc_write_ctx; 524 rec= &(s->s3->wrec); 525 if (s->enc_write_ctx == NULL) 526 enc=NULL; 527 else 528 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 529 } 530 else 531 { 532 if (s->read_hash != NULL) 533 n=EVP_MD_size(s->read_hash); 534 ds=s->enc_read_ctx; 535 rec= &(s->s3->rrec); 536 if (s->enc_read_ctx == NULL) 537 enc=NULL; 538 else 539 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 540 } 541 542 #ifdef KSSL_DEBUG 543 printf("tls1_enc(%d)\n", send); 544 #endif /* KSSL_DEBUG */ 545 546 if ((s->session == NULL) || (ds == NULL) || 547 (enc == NULL)) 548 { 549 memmove(rec->data,rec->input,rec->length); 550 rec->input=rec->data; 551 } 552 else 553 { 554 l=rec->length; 555 bs=EVP_CIPHER_block_size(ds->cipher); 556 557 if ((bs != 1) && send) 558 { 559 i=bs-((int)l%bs); 560 561 /* Add weird padding of upto 256 bytes */ 562 563 /* we need to add 'i' padding bytes of value j */ 564 j=i-1; 565 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 566 { 567 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 568 j++; 569 } 570 for (k=(int)l; k<(int)(l+i); k++) 571 rec->input[k]=j; 572 l+=i; 573 rec->length+=i; 574 } 575 576 #ifdef KSSL_DEBUG 577 { 578 unsigned long ui; 579 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 580 ds,rec->data,rec->input,l); 581 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", 582 ds->buf_len, ds->cipher->key_len, 583 DES_KEY_SZ, DES_SCHEDULE_SZ, 584 ds->cipher->iv_len); 585 printf("\t\tIV: "); 586 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); 587 printf("\n"); 588 printf("\trec->input="); 589 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); 590 printf("\n"); 591 } 592 #endif /* KSSL_DEBUG */ 593 594 if (!send) 595 { 596 if (l == 0 || l%bs != 0) 597 { 598 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 599 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 600 return 0; 601 } 602 } 603 604 EVP_Cipher(ds,rec->data,rec->input,l); 605 606 #ifdef KSSL_DEBUG 607 { 608 unsigned long i; 609 printf("\trec->data="); 610 for (i=0; i<l; i++) 611 printf(" %02x", rec->data[i]); printf("\n"); 612 } 613 #endif /* KSSL_DEBUG */ 614 615 if ((bs != 1) && !send) 616 { 617 ii=i=rec->data[l-1]; /* padding_length */ 618 i++; 619 if (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) 620 { 621 /* First packet is even in size, so check */ 622 if ((memcmp(s->s3->read_sequence, 623 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) 624 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; 625 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 626 i--; 627 } 628 /* TLS 1.0 does not bound the number of padding bytes by the block size. 629 * All of them must have value 'padding_length'. */ 630 if (i > (int)rec->length) 631 { 632 /* Incorrect padding. SSLerr() and ssl3_alert are done 633 * by caller: we don't want to reveal whether this is 634 * a decryption error or a MAC verification failure 635 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 636 return -1; 637 } 638 for (j=(int)(l-i); j<(int)l; j++) 639 { 640 if (rec->data[j] != ii) 641 { 642 /* Incorrect padding */ 643 return -1; 644 } 645 } 646 rec->length-=i; 647 } 648 } 649 return(1); 650 } 651 652 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out) 653 { 654 unsigned int ret; 655 EVP_MD_CTX ctx; 656 657 EVP_MD_CTX_init(&ctx); 658 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 659 EVP_DigestFinal_ex(&ctx,out,&ret); 660 EVP_MD_CTX_cleanup(&ctx); 661 return((int)ret); 662 } 663 664 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx, 665 const char *str, int slen, unsigned char *out) 666 { 667 unsigned int i; 668 EVP_MD_CTX ctx; 669 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 670 unsigned char *q,buf2[12]; 671 672 q=buf; 673 memcpy(q,str,slen); 674 q+=slen; 675 676 EVP_MD_CTX_init(&ctx); 677 EVP_MD_CTX_copy_ex(&ctx,in1_ctx); 678 EVP_DigestFinal_ex(&ctx,q,&i); 679 q+=i; 680 EVP_MD_CTX_copy_ex(&ctx,in2_ctx); 681 EVP_DigestFinal_ex(&ctx,q,&i); 682 q+=i; 683 684 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf), 685 s->session->master_key,s->session->master_key_length, 686 out,buf2,sizeof buf2); 687 EVP_MD_CTX_cleanup(&ctx); 688 689 return sizeof buf2; 690 } 691 692 int tls1_mac(SSL *ssl, unsigned char *md, int send) 693 { 694 SSL3_RECORD *rec; 695 unsigned char *mac_sec,*seq; 696 const EVP_MD *hash; 697 unsigned int md_size; 698 int i; 699 HMAC_CTX hmac; 700 unsigned char buf[5]; 701 702 if (send) 703 { 704 rec= &(ssl->s3->wrec); 705 mac_sec= &(ssl->s3->write_mac_secret[0]); 706 seq= &(ssl->s3->write_sequence[0]); 707 hash=ssl->write_hash; 708 } 709 else 710 { 711 rec= &(ssl->s3->rrec); 712 mac_sec= &(ssl->s3->read_mac_secret[0]); 713 seq= &(ssl->s3->read_sequence[0]); 714 hash=ssl->read_hash; 715 } 716 717 md_size=EVP_MD_size(hash); 718 719 buf[0]=rec->type; 720 buf[1]=TLS1_VERSION_MAJOR; 721 buf[2]=TLS1_VERSION_MINOR; 722 buf[3]=rec->length>>8; 723 buf[4]=rec->length&0xff; 724 725 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 726 HMAC_CTX_init(&hmac); 727 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL); 728 HMAC_Update(&hmac,seq,8); 729 HMAC_Update(&hmac,buf,5); 730 HMAC_Update(&hmac,rec->input,rec->length); 731 HMAC_Final(&hmac,md,&md_size); 732 HMAC_CTX_cleanup(&hmac); 733 734 #ifdef TLS_DEBUG 735 printf("sec="); 736 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 737 printf("seq="); 738 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 739 printf("buf="); 740 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 741 printf("rec="); 742 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 743 #endif 744 745 for (i=7; i>=0; i--) 746 { 747 ++seq[i]; 748 if (seq[i] != 0) break; 749 } 750 751 #ifdef TLS_DEBUG 752 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 753 #endif 754 return(md_size); 755 } 756 757 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 758 int len) 759 { 760 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE]; 761 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 762 763 #ifdef KSSL_DEBUG 764 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len); 765 #endif /* KSSL_DEBUG */ 766 767 /* Setup the stuff to munge */ 768 memcpy(buf,TLS_MD_MASTER_SECRET_CONST, 769 TLS_MD_MASTER_SECRET_CONST_SIZE); 770 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]), 771 s->s3->client_random,SSL3_RANDOM_SIZE); 772 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]), 773 s->s3->server_random,SSL3_RANDOM_SIZE); 774 tls1_PRF(s->ctx->md5,s->ctx->sha1, 775 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len, 776 s->session->master_key,buff,sizeof buff); 777 #ifdef KSSL_DEBUG 778 printf ("tls1_generate_master_secret() complete\n"); 779 #endif /* KSSL_DEBUG */ 780 return(SSL3_MASTER_SECRET_SIZE); 781 } 782 783 int tls1_alert_code(int code) 784 { 785 switch (code) 786 { 787 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 788 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 789 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 790 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 791 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 792 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 793 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 794 case SSL_AD_NO_CERTIFICATE: return(-1); 795 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 796 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 797 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 798 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 799 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 800 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 801 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 802 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 803 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 804 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 805 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 806 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 807 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 808 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 809 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 810 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 811 default: return(-1); 812 } 813 } 814 815