t1_enc.c revision e45f106cb6b47af1f21efe76e933bdea2f5dd1ca
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#ifndef OPENSSL_NO_COMP 115#include <openssl/comp.h> 116#endif 117#include <openssl/evp.h> 118#include <openssl/hmac.h> 119#include <openssl/md5.h> 120#ifdef KSSL_DEBUG 121#include <openssl/des.h> 122#endif 123 124static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 125 int sec_len, unsigned char *seed, int seed_len, 126 unsigned char *out, int olen) 127 { 128 int chunk,n; 129 unsigned int j; 130 HMAC_CTX ctx; 131 HMAC_CTX ctx_tmp; 132 unsigned char A1[EVP_MAX_MD_SIZE]; 133 unsigned int A1_len; 134 135 chunk=EVP_MD_size(md); 136 137 HMAC_CTX_init(&ctx); 138 HMAC_CTX_init(&ctx_tmp); 139 HMAC_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 140 HMAC_CTX_set_flags(&ctx_tmp, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 141 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL); 142 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL); 143 HMAC_Update(&ctx,seed,seed_len); 144 HMAC_Final(&ctx,A1,&A1_len); 145 146 n=0; 147 for (;;) 148 { 149 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */ 150 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */ 151 HMAC_Update(&ctx,A1,A1_len); 152 HMAC_Update(&ctx_tmp,A1,A1_len); 153 HMAC_Update(&ctx,seed,seed_len); 154 155 if (olen > chunk) 156 { 157 HMAC_Final(&ctx,out,&j); 158 out+=j; 159 olen-=j; 160 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */ 161 } 162 else /* last one */ 163 { 164 HMAC_Final(&ctx,A1,&A1_len); 165 memcpy(out,A1,olen); 166 break; 167 } 168 } 169 HMAC_CTX_cleanup(&ctx); 170 HMAC_CTX_cleanup(&ctx_tmp); 171 OPENSSL_cleanse(A1,sizeof(A1)); 172 } 173 174static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1, 175 unsigned char *label, int label_len, 176 const unsigned char *sec, int slen, unsigned char *out1, 177 unsigned char *out2, int olen) 178 { 179 int len,i; 180 const unsigned char *S1,*S2; 181 182 len=slen/2; 183 S1=sec; 184 S2= &(sec[len]); 185 len+=(slen&1); /* add for odd, make longer */ 186 187 188 tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen); 189 tls1_P_hash(sha1,S2,len,label,label_len,out2,olen); 190 191 for (i=0; i<olen; i++) 192 out1[i]^=out2[i]; 193 } 194 195static void tls1_generate_key_block(SSL *s, unsigned char *km, 196 unsigned char *tmp, int num) 197 { 198 unsigned char *p; 199 unsigned char buf[SSL3_RANDOM_SIZE*2+ 200 TLS_MD_MAX_CONST_SIZE]; 201 p=buf; 202 203 memcpy(p,TLS_MD_KEY_EXPANSION_CONST, 204 TLS_MD_KEY_EXPANSION_CONST_SIZE); 205 p+=TLS_MD_KEY_EXPANSION_CONST_SIZE; 206 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 207 p+=SSL3_RANDOM_SIZE; 208 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 209 p+=SSL3_RANDOM_SIZE; 210 211 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf), 212 s->session->master_key,s->session->master_key_length, 213 km,tmp,num); 214#ifdef KSSL_DEBUG 215 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 216 s->session->master_key_length); 217 { 218 int i; 219 for (i=0; i < s->session->master_key_length; i++) 220 { 221 printf("%02X", s->session->master_key[i]); 222 } 223 printf("\n"); } 224#endif /* KSSL_DEBUG */ 225 } 226 227int tls1_change_cipher_state(SSL *s, int which) 228 { 229 static const unsigned char empty[]=""; 230 unsigned char *p,*key_block,*mac_secret; 231 unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+ 232 SSL3_RANDOM_SIZE*2]; 233 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 234 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 235 unsigned char iv1[EVP_MAX_IV_LENGTH*2]; 236 unsigned char iv2[EVP_MAX_IV_LENGTH*2]; 237 unsigned char *ms,*key,*iv,*er1,*er2; 238 int client_write; 239 EVP_CIPHER_CTX *dd; 240 const EVP_CIPHER *c; 241#ifndef OPENSSL_NO_COMP 242 const SSL_COMP *comp; 243#endif 244 const EVP_MD *m; 245 int is_export,n,i,j,k,exp_label_len,cl; 246 int reuse_dd = 0; 247 248 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 249 c=s->s3->tmp.new_sym_enc; 250 m=s->s3->tmp.new_hash; 251#ifndef OPENSSL_NO_COMP 252 comp=s->s3->tmp.new_compression; 253#endif 254 key_block=s->s3->tmp.key_block; 255 256#ifdef KSSL_DEBUG 257 printf("tls1_change_cipher_state(which= %d) w/\n", which); 258 printf("\talg= %ld, comp= %p\n", s->s3->tmp.new_cipher->algorithms, 259 (void *)comp); 260 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c); 261 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n", 262 c->nid,c->block_size,c->key_len,c->iv_len); 263 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length); 264 { 265 int ki; 266 for (ki=0; ki<s->s3->tmp.key_block_length; ki++) 267 printf("%02x", key_block[ki]); printf("\n"); 268 } 269#endif /* KSSL_DEBUG */ 270 271 if (which & SSL3_CC_READ) 272 { 273 if (s->enc_read_ctx != NULL) 274 reuse_dd = 1; 275 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 276 goto err; 277 else 278 /* make sure it's intialized in case we exit later with an error */ 279 EVP_CIPHER_CTX_init(s->enc_read_ctx); 280 dd= s->enc_read_ctx; 281 s->read_hash=m; 282#ifndef OPENSSL_NO_COMP 283 if (s->expand != NULL) 284 { 285 COMP_CTX_free(s->expand); 286 s->expand=NULL; 287 } 288 if (comp != NULL) 289 { 290 s->expand=COMP_CTX_new(comp->method); 291 if (s->expand == NULL) 292 { 293 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 294 goto err2; 295 } 296 if (s->s3->rrec.comp == NULL) 297 s->s3->rrec.comp=(unsigned char *) 298 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 299 if (s->s3->rrec.comp == NULL) 300 goto err; 301 } 302#endif 303 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */ 304 if (s->version != DTLS1_VERSION) 305 memset(&(s->s3->read_sequence[0]),0,8); 306 mac_secret= &(s->s3->read_mac_secret[0]); 307 } 308 else 309 { 310 if (s->enc_write_ctx != NULL) 311 reuse_dd = 1; 312 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 313 goto err; 314 else 315 /* make sure it's intialized in case we exit later with an error */ 316 EVP_CIPHER_CTX_init(s->enc_write_ctx); 317 dd= s->enc_write_ctx; 318 s->write_hash=m; 319#ifndef OPENSSL_NO_COMP 320 if (s->compress != NULL) 321 { 322 COMP_CTX_free(s->compress); 323 s->compress=NULL; 324 } 325 if (comp != NULL) 326 { 327 s->compress=COMP_CTX_new(comp->method); 328 if (s->compress == NULL) 329 { 330 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 331 goto err2; 332 } 333 } 334#endif 335 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */ 336 if (s->version != DTLS1_VERSION) 337 memset(&(s->s3->write_sequence[0]),0,8); 338 mac_secret= &(s->s3->write_mac_secret[0]); 339 } 340 341 if (reuse_dd) 342 EVP_CIPHER_CTX_cleanup(dd); 343 344 p=s->s3->tmp.key_block; 345 i=EVP_MD_size(m); 346 cl=EVP_CIPHER_key_length(c); 347 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 348 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 349 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 350 k=EVP_CIPHER_iv_length(c); 351 er1= &(s->s3->client_random[0]); 352 er2= &(s->s3->server_random[0]); 353 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 354 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 355 { 356 ms= &(p[ 0]); n=i+i; 357 key= &(p[ n]); n+=j+j; 358 iv= &(p[ n]); n+=k+k; 359 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 360 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 361 client_write=1; 362 } 363 else 364 { 365 n=i; 366 ms= &(p[ n]); n+=i+j; 367 key= &(p[ n]); n+=j+k; 368 iv= &(p[ n]); n+=k; 369 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 370 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 371 client_write=0; 372 } 373 374 if (n > s->s3->tmp.key_block_length) 375 { 376 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 377 goto err2; 378 } 379 380 memcpy(mac_secret,ms,i); 381#ifdef TLS_DEBUG 382printf("which = %04X\nmac key=",which); 383{ int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); } 384#endif 385 if (is_export) 386 { 387 /* In here I set both the read and write key/iv to the 388 * same value since only the correct one will be used :-). 389 */ 390 p=buf; 391 memcpy(p,exp_label,exp_label_len); 392 p+=exp_label_len; 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,(int)(p-buf),key,j, 398 tmp1,tmp2,EVP_CIPHER_key_length(c)); 399 key=tmp1; 400 401 if (k > 0) 402 { 403 p=buf; 404 memcpy(p,TLS_MD_IV_BLOCK_CONST, 405 TLS_MD_IV_BLOCK_CONST_SIZE); 406 p+=TLS_MD_IV_BLOCK_CONST_SIZE; 407 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE); 408 p+=SSL3_RANDOM_SIZE; 409 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 410 p+=SSL3_RANDOM_SIZE; 411 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0, 412 iv1,iv2,k*2); 413 if (client_write) 414 iv=iv1; 415 else 416 iv= &(iv1[k]); 417 } 418 } 419 420 s->session->key_arg_length=0; 421#ifdef KSSL_DEBUG 422 { 423 int ki; 424 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n"); 425 printf("\tkey= "); 426 for (ki=0; ki<c->key_len; ki++) printf("%02x", key[ki]); 427 printf("\n"); 428 printf("\t iv= "); 429 for (ki=0; ki<c->iv_len; ki++) printf("%02x", iv[ki]); 430 printf("\n"); 431 } 432#endif /* KSSL_DEBUG */ 433 434 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 435#ifdef TLS_DEBUG 436printf("which = %04X\nkey=",which); 437{ int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); } 438printf("\niv="); 439{ int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); } 440printf("\n"); 441#endif 442 443 OPENSSL_cleanse(tmp1,sizeof(tmp1)); 444 OPENSSL_cleanse(tmp2,sizeof(tmp1)); 445 OPENSSL_cleanse(iv1,sizeof(iv1)); 446 OPENSSL_cleanse(iv2,sizeof(iv2)); 447 return(1); 448err: 449 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 450err2: 451 return(0); 452 } 453 454int tls1_setup_key_block(SSL *s) 455 { 456 unsigned char *p1,*p2; 457 const EVP_CIPHER *c; 458 const EVP_MD *hash; 459 int num; 460 SSL_COMP *comp; 461 462#ifdef KSSL_DEBUG 463 printf ("tls1_setup_key_block()\n"); 464#endif /* KSSL_DEBUG */ 465 466 if (s->s3->tmp.key_block_length != 0) 467 return(1); 468 469 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp)) 470 { 471 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 472 return(0); 473 } 474 475 s->s3->tmp.new_sym_enc=c; 476 s->s3->tmp.new_hash=hash; 477 478 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); 479 num*=2; 480 481 ssl3_cleanup_key_block(s); 482 483 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 484 goto err; 485 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 486 goto err; 487 488 s->s3->tmp.key_block_length=num; 489 s->s3->tmp.key_block=p1; 490 491 492#ifdef TLS_DEBUG 493printf("client random\n"); 494{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 495printf("server random\n"); 496{ int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 497printf("pre-master\n"); 498{ int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 499#endif 500 tls1_generate_key_block(s,p1,p2,num); 501 OPENSSL_cleanse(p2,num); 502 OPENSSL_free(p2); 503#ifdef TLS_DEBUG 504printf("\nkey block\n"); 505{ int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 506#endif 507 508 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 509 { 510 /* enable vulnerability countermeasure for CBC ciphers with 511 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 512 */ 513 s->s3->need_empty_fragments = 1; 514 515 if (s->session->cipher != NULL) 516 { 517 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL) 518 s->s3->need_empty_fragments = 0; 519 520#ifndef OPENSSL_NO_RC4 521 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4) 522 s->s3->need_empty_fragments = 0; 523#endif 524 } 525 } 526 527 return(1); 528err: 529 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 530 return(0); 531 } 532 533int tls1_enc(SSL *s, int send) 534 { 535 SSL3_RECORD *rec; 536 EVP_CIPHER_CTX *ds; 537 unsigned long l; 538 int bs,i,ii,j,k,n=0; 539 const EVP_CIPHER *enc; 540 541 if (send) 542 { 543 if (s->write_hash != NULL) 544 n=EVP_MD_size(s->write_hash); 545 ds=s->enc_write_ctx; 546 rec= &(s->s3->wrec); 547 if (s->enc_write_ctx == NULL) 548 enc=NULL; 549 else 550 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 551 } 552 else 553 { 554 if (s->read_hash != NULL) 555 n=EVP_MD_size(s->read_hash); 556 ds=s->enc_read_ctx; 557 rec= &(s->s3->rrec); 558 if (s->enc_read_ctx == NULL) 559 enc=NULL; 560 else 561 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 562 } 563 564#ifdef KSSL_DEBUG 565 printf("tls1_enc(%d)\n", send); 566#endif /* KSSL_DEBUG */ 567 568 if ((s->session == NULL) || (ds == NULL) || 569 (enc == NULL)) 570 { 571 memmove(rec->data,rec->input,rec->length); 572 rec->input=rec->data; 573 } 574 else 575 { 576 l=rec->length; 577 bs=EVP_CIPHER_block_size(ds->cipher); 578 579 if ((bs != 1) && send) 580 { 581 i=bs-((int)l%bs); 582 583 /* Add weird padding of upto 256 bytes */ 584 585 /* we need to add 'i' padding bytes of value j */ 586 j=i-1; 587 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 588 { 589 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 590 j++; 591 } 592 for (k=(int)l; k<(int)(l+i); k++) 593 rec->input[k]=j; 594 l+=i; 595 rec->length+=i; 596 } 597 598#ifdef KSSL_DEBUG 599 { 600 unsigned long ui; 601 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 602 (void *)ds,rec->data,rec->input,l); 603 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%ld %ld], %d iv_len\n", 604 ds->buf_len, ds->cipher->key_len, 605 (unsigned long)DES_KEY_SZ, 606 (unsigned long)DES_SCHEDULE_SZ, 607 ds->cipher->iv_len); 608 printf("\t\tIV: "); 609 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); 610 printf("\n"); 611 printf("\trec->input="); 612 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); 613 printf("\n"); 614 } 615#endif /* KSSL_DEBUG */ 616 617 if (!send) 618 { 619 if (l == 0 || l%bs != 0) 620 { 621 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 622 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 623 return 0; 624 } 625 } 626 627 EVP_Cipher(ds,rec->data,rec->input,l); 628 629#ifdef KSSL_DEBUG 630 { 631 unsigned long ki; 632 printf("\trec->data="); 633 for (ki=0; ki<l; i++) 634 printf(" %02x", rec->data[ki]); printf("\n"); 635 } 636#endif /* KSSL_DEBUG */ 637 638 if ((bs != 1) && !send) 639 { 640 ii=i=rec->data[l-1]; /* padding_length */ 641 i++; 642 /* NB: if compression is in operation the first packet 643 * may not be of even length so the padding bug check 644 * cannot be performed. This bug workaround has been 645 * around since SSLeay so hopefully it is either fixed 646 * now or no buggy implementation supports compression 647 * [steve] 648 */ 649 if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) 650 && !s->expand) 651 { 652 /* First packet is even in size, so check */ 653 if ((memcmp(s->s3->read_sequence, 654 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) 655 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; 656 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 657 i--; 658 } 659 /* TLS 1.0 does not bound the number of padding bytes by the block size. 660 * All of them must have value 'padding_length'. */ 661 if (i > (int)rec->length) 662 { 663 /* Incorrect padding. SSLerr() and ssl3_alert are done 664 * by caller: we don't want to reveal whether this is 665 * a decryption error or a MAC verification failure 666 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 667 return -1; 668 } 669 for (j=(int)(l-i); j<(int)l; j++) 670 { 671 if (rec->data[j] != ii) 672 { 673 /* Incorrect padding */ 674 return -1; 675 } 676 } 677 rec->length-=i; 678 } 679 } 680 return(1); 681 } 682 683int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out) 684 { 685 unsigned int ret; 686 EVP_MD_CTX ctx; 687 688 EVP_MD_CTX_init(&ctx); 689 EVP_MD_CTX_copy_ex(&ctx,in_ctx); 690 EVP_DigestFinal_ex(&ctx,out,&ret); 691 EVP_MD_CTX_cleanup(&ctx); 692 return((int)ret); 693 } 694 695int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx, 696 const char *str, int slen, unsigned char *out) 697 { 698 unsigned int i; 699 EVP_MD_CTX ctx; 700 unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 701 unsigned char *q,buf2[12]; 702 703 q=buf; 704 memcpy(q,str,slen); 705 q+=slen; 706 707 EVP_MD_CTX_init(&ctx); 708 EVP_MD_CTX_copy_ex(&ctx,in1_ctx); 709 EVP_DigestFinal_ex(&ctx,q,&i); 710 q+=i; 711 EVP_MD_CTX_copy_ex(&ctx,in2_ctx); 712 EVP_DigestFinal_ex(&ctx,q,&i); 713 q+=i; 714 715 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf), 716 s->session->master_key,s->session->master_key_length, 717 out,buf2,sizeof buf2); 718 EVP_MD_CTX_cleanup(&ctx); 719 720 return sizeof buf2; 721 } 722 723int tls1_mac(SSL *ssl, unsigned char *md, int send) 724 { 725 SSL3_RECORD *rec; 726 unsigned char *mac_sec,*seq; 727 const EVP_MD *hash; 728 unsigned int md_size; 729 int i; 730 HMAC_CTX hmac; 731 unsigned char buf[5]; 732 733 if (send) 734 { 735 rec= &(ssl->s3->wrec); 736 mac_sec= &(ssl->s3->write_mac_secret[0]); 737 seq= &(ssl->s3->write_sequence[0]); 738 hash=ssl->write_hash; 739 } 740 else 741 { 742 rec= &(ssl->s3->rrec); 743 mac_sec= &(ssl->s3->read_mac_secret[0]); 744 seq= &(ssl->s3->read_sequence[0]); 745 hash=ssl->read_hash; 746 } 747 748 md_size=EVP_MD_size(hash); 749 750 buf[0]=rec->type; 751 if (ssl->version == DTLS1_VERSION && ssl->client_version == DTLS1_BAD_VER) 752 { 753 buf[1]=TLS1_VERSION_MAJOR; 754 buf[2]=TLS1_VERSION_MINOR; 755 } 756 else { 757 buf[1]=(unsigned char)(ssl->version>>8); 758 buf[2]=(unsigned char)(ssl->version); 759 } 760 761 buf[3]=rec->length>>8; 762 buf[4]=rec->length&0xff; 763 764 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 765 HMAC_CTX_init(&hmac); 766 HMAC_Init_ex(&hmac,mac_sec,EVP_MD_size(hash),hash,NULL); 767 768 if (ssl->version == DTLS1_VERSION && ssl->client_version != DTLS1_BAD_VER) 769 { 770 unsigned char dtlsseq[8],*p=dtlsseq; 771 772 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p); 773 memcpy (p,&seq[2],6); 774 775 HMAC_Update(&hmac,dtlsseq,8); 776 } 777 else 778 HMAC_Update(&hmac,seq,8); 779 780 HMAC_Update(&hmac,buf,5); 781 HMAC_Update(&hmac,rec->input,rec->length); 782 HMAC_Final(&hmac,md,&md_size); 783 HMAC_CTX_cleanup(&hmac); 784 785#ifdef TLS_DEBUG 786printf("sec="); 787{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 788printf("seq="); 789{int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 790printf("buf="); 791{int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 792printf("rec="); 793{unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 794#endif 795 796 if ( SSL_version(ssl) != DTLS1_VERSION) 797 { 798 for (i=7; i>=0; i--) 799 { 800 ++seq[i]; 801 if (seq[i] != 0) break; 802 } 803 } 804 805#ifdef TLS_DEBUG 806{unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 807#endif 808 return(md_size); 809 } 810 811int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 812 int len) 813 { 814 unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE]; 815 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 816 817#ifdef KSSL_DEBUG 818 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s,out, p,len); 819#endif /* KSSL_DEBUG */ 820 821 /* Setup the stuff to munge */ 822 memcpy(buf,TLS_MD_MASTER_SECRET_CONST, 823 TLS_MD_MASTER_SECRET_CONST_SIZE); 824 memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]), 825 s->s3->client_random,SSL3_RANDOM_SIZE); 826 memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]), 827 s->s3->server_random,SSL3_RANDOM_SIZE); 828 tls1_PRF(s->ctx->md5,s->ctx->sha1, 829 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len, 830 s->session->master_key,buff,sizeof buff); 831#ifdef KSSL_DEBUG 832 printf ("tls1_generate_master_secret() complete\n"); 833#endif /* KSSL_DEBUG */ 834 return(SSL3_MASTER_SECRET_SIZE); 835 } 836 837int tls1_alert_code(int code) 838 { 839 switch (code) 840 { 841 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 842 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 843 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 844 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 845 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 846 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 847 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 848 case SSL_AD_NO_CERTIFICATE: return(-1); 849 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 850 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 851 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 852 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 853 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 854 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 855 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 856 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 857 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 858 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 859 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 860 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 861 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 862 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 863 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 864 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 865#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 866 case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 867 (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 868#endif 869 default: return(-1); 870 } 871 } 872 873