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) 1998-2007 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 * Copyright 2005 Nokia. All rights reserved. 113 * 114 * The portions of the attached software ("Contribution") is developed by 115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 116 * license. 117 * 118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 120 * support (see RFC 4279) to OpenSSL. 121 * 122 * No patent licenses or other rights except those expressly stated in 123 * the OpenSSL open source license shall be deemed granted or received 124 * expressly, by implication, estoppel, or otherwise. 125 * 126 * No assurances are provided by Nokia that the Contribution does not 127 * infringe the patent or other intellectual property rights of any third 128 * party or that the license provides you with all the necessary rights 129 * to make use of the Contribution. 130 * 131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 135 * OTHERWISE. 136 */ 137 138 #include <stdio.h> 139 #include "ssl_locl.h" 140 #ifndef OPENSSL_NO_COMP 141 #include <openssl/comp.h> 142 #endif 143 #include <openssl/evp.h> 144 #include <openssl/hmac.h> 145 #include <openssl/md5.h> 146 #include <openssl/rand.h> 147 #ifdef KSSL_DEBUG 148 #include <openssl/des.h> 149 #endif 150 151 /* seed1 through seed5 are virtually concatenated */ 152 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec, 153 int sec_len, 154 const void *seed1, int seed1_len, 155 const void *seed2, int seed2_len, 156 const void *seed3, int seed3_len, 157 const void *seed4, int seed4_len, 158 const void *seed5, int seed5_len, 159 unsigned char *out, int olen) 160 { 161 int chunk,n; 162 unsigned int j; 163 HMAC_CTX ctx; 164 HMAC_CTX ctx_tmp; 165 unsigned char A1[EVP_MAX_MD_SIZE]; 166 unsigned int A1_len; 167 168 chunk=EVP_MD_size(md); 169 OPENSSL_assert(chunk >= 0); 170 171 HMAC_CTX_init(&ctx); 172 HMAC_CTX_init(&ctx_tmp); 173 HMAC_Init_ex(&ctx,sec,sec_len,md, NULL); 174 HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL); 175 if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len); 176 if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len); 177 if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len); 178 if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len); 179 if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len); 180 HMAC_Final(&ctx,A1,&A1_len); 181 182 n=0; 183 for (;;) 184 { 185 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */ 186 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */ 187 HMAC_Update(&ctx,A1,A1_len); 188 HMAC_Update(&ctx_tmp,A1,A1_len); 189 if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len); 190 if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len); 191 if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len); 192 if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len); 193 if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len); 194 195 if (olen > chunk) 196 { 197 HMAC_Final(&ctx,out,&j); 198 out+=j; 199 olen-=j; 200 HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */ 201 } 202 else /* last one */ 203 { 204 HMAC_Final(&ctx,A1,&A1_len); 205 memcpy(out,A1,olen); 206 break; 207 } 208 } 209 HMAC_CTX_cleanup(&ctx); 210 HMAC_CTX_cleanup(&ctx_tmp); 211 OPENSSL_cleanse(A1,sizeof(A1)); 212 } 213 214 /* seed1 through seed5 are virtually concatenated */ 215 static void tls1_PRF(long digest_mask, 216 const void *seed1, int seed1_len, 217 const void *seed2, int seed2_len, 218 const void *seed3, int seed3_len, 219 const void *seed4, int seed4_len, 220 const void *seed5, int seed5_len, 221 const unsigned char *sec, int slen, 222 unsigned char *out1, 223 unsigned char *out2, int olen) 224 { 225 int len,i,idx,count; 226 const unsigned char *S1; 227 long m; 228 const EVP_MD *md; 229 230 /* Count number of digests and partition sec evenly */ 231 count=0; 232 for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) { 233 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++; 234 } 235 len=slen/count; 236 S1=sec; 237 memset(out1,0,olen); 238 for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) { 239 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) { 240 if (!md) { 241 SSLerr(SSL_F_TLS1_PRF, 242 SSL_R_UNSUPPORTED_DIGEST_TYPE); 243 return; 244 } 245 tls1_P_hash(md ,S1,len+(slen&1), 246 seed1,seed1_len,seed2,seed2_len,seed3,seed3_len,seed4,seed4_len,seed5,seed5_len, 247 out2,olen); 248 S1+=len; 249 for (i=0; i<olen; i++) 250 { 251 out1[i]^=out2[i]; 252 } 253 } 254 } 255 256 } 257 static void tls1_generate_key_block(SSL *s, unsigned char *km, 258 unsigned char *tmp, int num) 259 { 260 tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 261 TLS_MD_KEY_EXPANSION_CONST,TLS_MD_KEY_EXPANSION_CONST_SIZE, 262 s->s3->server_random,SSL3_RANDOM_SIZE, 263 s->s3->client_random,SSL3_RANDOM_SIZE, 264 NULL,0,NULL,0, 265 s->session->master_key,s->session->master_key_length, 266 km,tmp,num); 267 #ifdef KSSL_DEBUG 268 printf("tls1_generate_key_block() ==> %d byte master_key =\n\t", 269 s->session->master_key_length); 270 { 271 int i; 272 for (i=0; i < s->session->master_key_length; i++) 273 { 274 printf("%02X", s->session->master_key[i]); 275 } 276 printf("\n"); } 277 #endif /* KSSL_DEBUG */ 278 } 279 280 int tls1_change_cipher_state(SSL *s, int which) 281 { 282 static const unsigned char empty[]=""; 283 unsigned char *p,*key_block,*mac_secret; 284 unsigned char *exp_label; 285 unsigned char tmp1[EVP_MAX_KEY_LENGTH]; 286 unsigned char tmp2[EVP_MAX_KEY_LENGTH]; 287 unsigned char iv1[EVP_MAX_IV_LENGTH*2]; 288 unsigned char iv2[EVP_MAX_IV_LENGTH*2]; 289 unsigned char *ms,*key,*iv,*er1,*er2; 290 int client_write; 291 EVP_CIPHER_CTX *dd; 292 const EVP_CIPHER *c; 293 #ifndef OPENSSL_NO_COMP 294 const SSL_COMP *comp; 295 #endif 296 const EVP_MD *m; 297 int mac_type; 298 int *mac_secret_size; 299 EVP_MD_CTX *mac_ctx; 300 EVP_PKEY *mac_key; 301 int is_export,n,i,j,k,exp_label_len,cl; 302 int reuse_dd = 0; 303 304 is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); 305 c=s->s3->tmp.new_sym_enc; 306 m=s->s3->tmp.new_hash; 307 mac_type = s->s3->tmp.new_mac_pkey_type; 308 #ifndef OPENSSL_NO_COMP 309 comp=s->s3->tmp.new_compression; 310 #endif 311 key_block=s->s3->tmp.key_block; 312 313 #ifdef KSSL_DEBUG 314 printf("tls1_change_cipher_state(which= %d) w/\n", which); 315 printf("\talg= %ld/%ld, comp= %p\n", 316 s->s3->tmp.new_cipher->algorithm_mkey, 317 s->s3->tmp.new_cipher->algorithm_auth, 318 comp); 319 printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c); 320 printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n", 321 c->nid,c->block_size,c->key_len,c->iv_len); 322 printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length); 323 { 324 int i; 325 for (i=0; i<s->s3->tmp.key_block_length; i++) 326 printf("%02x", key_block[i]); printf("\n"); 327 } 328 #endif /* KSSL_DEBUG */ 329 330 if (which & SSL3_CC_READ) 331 { 332 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) 333 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM; 334 else 335 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM; 336 337 if (s->enc_read_ctx != NULL) 338 reuse_dd = 1; 339 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 340 goto err; 341 else 342 /* make sure it's intialized in case we exit later with an error */ 343 EVP_CIPHER_CTX_init(s->enc_read_ctx); 344 dd= s->enc_read_ctx; 345 mac_ctx=ssl_replace_hash(&s->read_hash,NULL); 346 #ifndef OPENSSL_NO_COMP 347 if (s->expand != NULL) 348 { 349 COMP_CTX_free(s->expand); 350 s->expand=NULL; 351 } 352 if (comp != NULL) 353 { 354 s->expand=COMP_CTX_new(comp->method); 355 if (s->expand == NULL) 356 { 357 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 358 goto err2; 359 } 360 if (s->s3->rrec.comp == NULL) 361 s->s3->rrec.comp=(unsigned char *) 362 OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH); 363 if (s->s3->rrec.comp == NULL) 364 goto err; 365 } 366 #endif 367 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */ 368 if (s->version != DTLS1_VERSION) 369 memset(&(s->s3->read_sequence[0]),0,8); 370 mac_secret= &(s->s3->read_mac_secret[0]); 371 mac_secret_size=&(s->s3->read_mac_secret_size); 372 } 373 else 374 { 375 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC) 376 s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM; 377 else 378 s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM; 379 if (s->enc_write_ctx != NULL) 380 reuse_dd = 1; 381 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) 382 goto err; 383 else 384 /* make sure it's intialized in case we exit later with an error */ 385 EVP_CIPHER_CTX_init(s->enc_write_ctx); 386 dd= s->enc_write_ctx; 387 mac_ctx = ssl_replace_hash(&s->write_hash,NULL); 388 #ifndef OPENSSL_NO_COMP 389 if (s->compress != NULL) 390 { 391 COMP_CTX_free(s->compress); 392 s->compress=NULL; 393 } 394 if (comp != NULL) 395 { 396 s->compress=COMP_CTX_new(comp->method); 397 if (s->compress == NULL) 398 { 399 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); 400 goto err2; 401 } 402 } 403 #endif 404 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */ 405 if (s->version != DTLS1_VERSION) 406 memset(&(s->s3->write_sequence[0]),0,8); 407 mac_secret= &(s->s3->write_mac_secret[0]); 408 mac_secret_size = &(s->s3->write_mac_secret_size); 409 } 410 411 if (reuse_dd) 412 EVP_CIPHER_CTX_cleanup(dd); 413 414 p=s->s3->tmp.key_block; 415 i=*mac_secret_size=s->s3->tmp.new_mac_secret_size; 416 417 cl=EVP_CIPHER_key_length(c); 418 j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? 419 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; 420 /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */ 421 k=EVP_CIPHER_iv_length(c); 422 er1= &(s->s3->client_random[0]); 423 er2= &(s->s3->server_random[0]); 424 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || 425 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) 426 { 427 ms= &(p[ 0]); n=i+i; 428 key= &(p[ n]); n+=j+j; 429 iv= &(p[ n]); n+=k+k; 430 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST; 431 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE; 432 client_write=1; 433 } 434 else 435 { 436 n=i; 437 ms= &(p[ n]); n+=i+j; 438 key= &(p[ n]); n+=j+k; 439 iv= &(p[ n]); n+=k; 440 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST; 441 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE; 442 client_write=0; 443 } 444 445 if (n > s->s3->tmp.key_block_length) 446 { 447 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); 448 goto err2; 449 } 450 451 memcpy(mac_secret,ms,i); 452 mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, 453 mac_secret,*mac_secret_size); 454 EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key); 455 EVP_PKEY_free(mac_key); 456 #ifdef TLS_DEBUG 457 printf("which = %04X\nmac key=",which); 458 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); } 459 #endif 460 if (is_export) 461 { 462 /* In here I set both the read and write key/iv to the 463 * same value since only the correct one will be used :-). 464 */ 465 tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 466 exp_label,exp_label_len, 467 s->s3->client_random,SSL3_RANDOM_SIZE, 468 s->s3->server_random,SSL3_RANDOM_SIZE, 469 NULL,0,NULL,0, 470 key,j,tmp1,tmp2,EVP_CIPHER_key_length(c)); 471 key=tmp1; 472 473 if (k > 0) 474 { 475 tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 476 TLS_MD_IV_BLOCK_CONST,TLS_MD_IV_BLOCK_CONST_SIZE, 477 s->s3->client_random,SSL3_RANDOM_SIZE, 478 s->s3->server_random,SSL3_RANDOM_SIZE, 479 NULL,0,NULL,0, 480 empty,0,iv1,iv2,k*2); 481 if (client_write) 482 iv=iv1; 483 else 484 iv= &(iv1[k]); 485 } 486 } 487 488 s->session->key_arg_length=0; 489 #ifdef KSSL_DEBUG 490 { 491 int i; 492 printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n"); 493 printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]); 494 printf("\n"); 495 printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]); 496 printf("\n"); 497 } 498 #endif /* KSSL_DEBUG */ 499 500 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); 501 #ifdef TLS_DEBUG 502 printf("which = %04X\nkey=",which); 503 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); } 504 printf("\niv="); 505 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); } 506 printf("\n"); 507 #endif 508 509 OPENSSL_cleanse(tmp1,sizeof(tmp1)); 510 OPENSSL_cleanse(tmp2,sizeof(tmp1)); 511 OPENSSL_cleanse(iv1,sizeof(iv1)); 512 OPENSSL_cleanse(iv2,sizeof(iv2)); 513 return(1); 514 err: 515 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); 516 err2: 517 return(0); 518 } 519 520 int tls1_setup_key_block(SSL *s) 521 { 522 unsigned char *p1,*p2; 523 const EVP_CIPHER *c; 524 const EVP_MD *hash; 525 int num; 526 SSL_COMP *comp; 527 int mac_type= NID_undef,mac_secret_size=0; 528 529 #ifdef KSSL_DEBUG 530 printf ("tls1_setup_key_block()\n"); 531 #endif /* KSSL_DEBUG */ 532 533 if (s->s3->tmp.key_block_length != 0) 534 return(1); 535 536 if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size,&comp)) 537 { 538 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 539 return(0); 540 } 541 542 s->s3->tmp.new_sym_enc=c; 543 s->s3->tmp.new_hash=hash; 544 s->s3->tmp.new_mac_pkey_type = mac_type; 545 s->s3->tmp.new_mac_secret_size = mac_secret_size; 546 num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c); 547 num*=2; 548 549 ssl3_cleanup_key_block(s); 550 551 if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL) 552 goto err; 553 if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL) 554 goto err; 555 556 s->s3->tmp.key_block_length=num; 557 s->s3->tmp.key_block=p1; 558 559 560 #ifdef TLS_DEBUG 561 printf("client random\n"); 562 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); } 563 printf("server random\n"); 564 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); } 565 printf("pre-master\n"); 566 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); } 567 #endif 568 tls1_generate_key_block(s,p1,p2,num); 569 OPENSSL_cleanse(p2,num); 570 OPENSSL_free(p2); 571 #ifdef TLS_DEBUG 572 printf("\nkey block\n"); 573 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); } 574 #endif 575 576 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) 577 { 578 /* enable vulnerability countermeasure for CBC ciphers with 579 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) 580 */ 581 s->s3->need_empty_fragments = 1; 582 583 if (s->session->cipher != NULL) 584 { 585 if (s->session->cipher->algorithm_enc == SSL_eNULL) 586 s->s3->need_empty_fragments = 0; 587 588 #ifndef OPENSSL_NO_RC4 589 if (s->session->cipher->algorithm_enc == SSL_RC4) 590 s->s3->need_empty_fragments = 0; 591 #endif 592 } 593 } 594 595 return(1); 596 err: 597 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); 598 return(0); 599 } 600 601 int tls1_enc(SSL *s, int send) 602 { 603 SSL3_RECORD *rec; 604 EVP_CIPHER_CTX *ds; 605 unsigned long l; 606 int bs,i,ii,j,k,n=0; 607 const EVP_CIPHER *enc; 608 609 if (send) 610 { 611 if (EVP_MD_CTX_md(s->write_hash)) 612 { 613 n=EVP_MD_CTX_size(s->write_hash); 614 OPENSSL_assert(n >= 0); 615 } 616 ds=s->enc_write_ctx; 617 rec= &(s->s3->wrec); 618 if (s->enc_write_ctx == NULL) 619 enc=NULL; 620 else 621 { 622 int ivlen; 623 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); 624 /* For TLSv1.1 and later explicit IV */ 625 if (s->version >= TLS1_1_VERSION) 626 ivlen = EVP_CIPHER_iv_length(enc); 627 else 628 ivlen = 0; 629 if (ivlen > 1) 630 { 631 if ( rec->data != rec->input) 632 /* we can't write into the input stream: 633 * Can this ever happen?? (steve) 634 */ 635 fprintf(stderr, 636 "%s:%d: rec->data != rec->input\n", 637 __FILE__, __LINE__); 638 else if (RAND_bytes(rec->input, ivlen) <= 0) 639 return -1; 640 } 641 } 642 } 643 else 644 { 645 if (EVP_MD_CTX_md(s->read_hash)) 646 { 647 n=EVP_MD_CTX_size(s->read_hash); 648 OPENSSL_assert(n >= 0); 649 } 650 ds=s->enc_read_ctx; 651 rec= &(s->s3->rrec); 652 if (s->enc_read_ctx == NULL) 653 enc=NULL; 654 else 655 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); 656 } 657 658 #ifdef KSSL_DEBUG 659 printf("tls1_enc(%d)\n", send); 660 #endif /* KSSL_DEBUG */ 661 662 if ((s->session == NULL) || (ds == NULL) || 663 (enc == NULL)) 664 { 665 memmove(rec->data,rec->input,rec->length); 666 rec->input=rec->data; 667 } 668 else 669 { 670 l=rec->length; 671 bs=EVP_CIPHER_block_size(ds->cipher); 672 673 if ((bs != 1) && send) 674 { 675 i=bs-((int)l%bs); 676 677 /* Add weird padding of upto 256 bytes */ 678 679 /* we need to add 'i' padding bytes of value j */ 680 j=i-1; 681 if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG) 682 { 683 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 684 j++; 685 } 686 for (k=(int)l; k<(int)(l+i); k++) 687 rec->input[k]=j; 688 l+=i; 689 rec->length+=i; 690 } 691 692 #ifdef KSSL_DEBUG 693 { 694 unsigned long ui; 695 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n", 696 ds,rec->data,rec->input,l); 697 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n", 698 ds->buf_len, ds->cipher->key_len, 699 DES_KEY_SZ, DES_SCHEDULE_SZ, 700 ds->cipher->iv_len); 701 printf("\t\tIV: "); 702 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]); 703 printf("\n"); 704 printf("\trec->input="); 705 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]); 706 printf("\n"); 707 } 708 #endif /* KSSL_DEBUG */ 709 710 if (!send) 711 { 712 if (l == 0 || l%bs != 0) 713 { 714 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); 715 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); 716 return 0; 717 } 718 } 719 720 EVP_Cipher(ds,rec->data,rec->input,l); 721 722 #ifdef KSSL_DEBUG 723 { 724 unsigned long i; 725 printf("\trec->data="); 726 for (i=0; i<l; i++) 727 printf(" %02x", rec->data[i]); printf("\n"); 728 } 729 #endif /* KSSL_DEBUG */ 730 731 if ((bs != 1) && !send) 732 { 733 ii=i=rec->data[l-1]; /* padding_length */ 734 i++; 735 /* NB: if compression is in operation the first packet 736 * may not be of even length so the padding bug check 737 * cannot be performed. This bug workaround has been 738 * around since SSLeay so hopefully it is either fixed 739 * now or no buggy implementation supports compression 740 * [steve] 741 */ 742 if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG) 743 && !s->expand) 744 { 745 /* First packet is even in size, so check */ 746 if ((memcmp(s->s3->read_sequence, 747 "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1)) 748 s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG; 749 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG) 750 i--; 751 } 752 /* TLS 1.0 does not bound the number of padding bytes by the block size. 753 * All of them must have value 'padding_length'. */ 754 if (i > (int)rec->length) 755 { 756 /* Incorrect padding. SSLerr() and ssl3_alert are done 757 * by caller: we don't want to reveal whether this is 758 * a decryption error or a MAC verification failure 759 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ 760 return -1; 761 } 762 for (j=(int)(l-i); j<(int)l; j++) 763 { 764 if (rec->data[j] != ii) 765 { 766 /* Incorrect padding */ 767 return -1; 768 } 769 } 770 rec->length -=i; 771 if (s->version >= TLS1_1_VERSION) 772 { 773 rec->data += bs; /* skip the explicit IV */ 774 rec->input += bs; 775 rec->length -= bs; 776 } 777 } 778 } 779 return(1); 780 } 781 int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out) 782 { 783 unsigned int ret; 784 EVP_MD_CTX ctx, *d=NULL; 785 int i; 786 787 if (s->s3->handshake_buffer) 788 if (!ssl3_digest_cached_records(s)) 789 return 0; 790 791 if (s->s3->handshake_dgst) { 792 for (i=0;i<SSL_MAX_DIGEST;i++) 793 { 794 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) 795 { 796 d=s->s3->handshake_dgst[i]; 797 break; 798 } 799 } 800 } 801 if (!d) { 802 SSLerr(SSL_F_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST); 803 return 0; 804 } 805 806 EVP_MD_CTX_init(&ctx); 807 EVP_MD_CTX_copy_ex(&ctx,d); 808 EVP_DigestFinal_ex(&ctx,out,&ret); 809 EVP_MD_CTX_cleanup(&ctx); 810 return((int)ret); 811 } 812 813 int tls1_final_finish_mac(SSL *s, 814 const char *str, int slen, unsigned char *out) 815 { 816 unsigned int i; 817 EVP_MD_CTX ctx; 818 unsigned char buf[2*EVP_MAX_MD_SIZE]; 819 unsigned char *q,buf2[12]; 820 int idx; 821 long mask; 822 int err=0; 823 const EVP_MD *md; 824 825 q=buf; 826 827 if (s->s3->handshake_buffer) 828 if (!ssl3_digest_cached_records(s)) 829 return 0; 830 831 EVP_MD_CTX_init(&ctx); 832 833 for (idx=0;ssl_get_handshake_digest(idx,&mask,&md);idx++) 834 { 835 if (mask & s->s3->tmp.new_cipher->algorithm2) 836 { 837 int hashsize = EVP_MD_size(md); 838 if (hashsize < 0 || hashsize > (int)(sizeof buf - (size_t)(q-buf)) || s->s3->handshake_dgst == NULL) 839 { 840 /* internal error: 'buf' is too small for this cipersuite! */ 841 err = 1; 842 } 843 else 844 { 845 EVP_MD_CTX_copy_ex(&ctx,s->s3->handshake_dgst[idx]); 846 EVP_DigestFinal_ex(&ctx,q,&i); 847 if (i != (unsigned int)hashsize) /* can't really happen */ 848 err = 1; 849 q+=i; 850 } 851 } 852 } 853 854 tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 855 str,slen, buf,(int)(q-buf), NULL,0, NULL,0, NULL,0, 856 s->session->master_key,s->session->master_key_length, 857 out,buf2,sizeof buf2); 858 EVP_MD_CTX_cleanup(&ctx); 859 860 if (err) 861 return 0; 862 else 863 return sizeof buf2; 864 } 865 866 int tls1_mac(SSL *ssl, unsigned char *md, int send) 867 { 868 SSL3_RECORD *rec; 869 unsigned char *mac_sec,*seq; 870 EVP_MD_CTX *hash; 871 size_t md_size; 872 int i; 873 EVP_MD_CTX hmac, *mac_ctx; 874 unsigned char buf[5]; 875 int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM)); 876 int t; 877 878 if (send) 879 { 880 rec= &(ssl->s3->wrec); 881 mac_sec= &(ssl->s3->write_mac_secret[0]); 882 seq= &(ssl->s3->write_sequence[0]); 883 hash=ssl->write_hash; 884 } 885 else 886 { 887 rec= &(ssl->s3->rrec); 888 mac_sec= &(ssl->s3->read_mac_secret[0]); 889 seq= &(ssl->s3->read_sequence[0]); 890 hash=ssl->read_hash; 891 } 892 893 t=EVP_MD_CTX_size(hash); 894 OPENSSL_assert(t >= 0); 895 md_size=t; 896 897 buf[0]=rec->type; 898 buf[1]=(unsigned char)(ssl->version>>8); 899 buf[2]=(unsigned char)(ssl->version); 900 buf[3]=rec->length>>8; 901 buf[4]=rec->length&0xff; 902 903 /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */ 904 if (stream_mac) 905 { 906 mac_ctx = hash; 907 } 908 else 909 { 910 EVP_MD_CTX_copy(&hmac,hash); 911 mac_ctx = &hmac; 912 } 913 914 if (ssl->version == DTLS1_VERSION || ssl->version == DTLS1_BAD_VER) 915 { 916 unsigned char dtlsseq[8],*p=dtlsseq; 917 918 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p); 919 memcpy (p,&seq[2],6); 920 921 EVP_DigestSignUpdate(mac_ctx,dtlsseq,8); 922 } 923 else 924 EVP_DigestSignUpdate(mac_ctx,seq,8); 925 926 EVP_DigestSignUpdate(mac_ctx,buf,5); 927 EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length); 928 t=EVP_DigestSignFinal(mac_ctx,md,&md_size); 929 OPENSSL_assert(t > 0); 930 931 if (!stream_mac) EVP_MD_CTX_cleanup(&hmac); 932 #ifdef TLS_DEBUG 933 printf("sec="); 934 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); } 935 printf("seq="); 936 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); } 937 printf("buf="); 938 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); } 939 printf("rec="); 940 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); } 941 #endif 942 943 if (ssl->version != DTLS1_VERSION && ssl->version != DTLS1_BAD_VER) 944 { 945 for (i=7; i>=0; i--) 946 { 947 ++seq[i]; 948 if (seq[i] != 0) break; 949 } 950 } 951 952 #ifdef TLS_DEBUG 953 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); } 954 #endif 955 return(md_size); 956 } 957 958 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, 959 int len) 960 { 961 unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH]; 962 const void *co = NULL, *so = NULL; 963 int col = 0, sol = 0; 964 965 #ifdef KSSL_DEBUG 966 printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len); 967 #endif /* KSSL_DEBUG */ 968 969 #ifdef TLSEXT_TYPE_opaque_prf_input 970 if (s->s3->client_opaque_prf_input != NULL && s->s3->server_opaque_prf_input != NULL && 971 s->s3->client_opaque_prf_input_len > 0 && 972 s->s3->client_opaque_prf_input_len == s->s3->server_opaque_prf_input_len) 973 { 974 co = s->s3->client_opaque_prf_input; 975 col = s->s3->server_opaque_prf_input_len; 976 so = s->s3->server_opaque_prf_input; 977 sol = s->s3->client_opaque_prf_input_len; /* must be same as col (see draft-rescorla-tls-opaque-prf-input-00.txt, section 3.1) */ 978 } 979 #endif 980 981 tls1_PRF(s->s3->tmp.new_cipher->algorithm2, 982 TLS_MD_MASTER_SECRET_CONST,TLS_MD_MASTER_SECRET_CONST_SIZE, 983 s->s3->client_random,SSL3_RANDOM_SIZE, 984 co, col, 985 s->s3->server_random,SSL3_RANDOM_SIZE, 986 so, sol, 987 p,len, 988 s->session->master_key,buff,sizeof buff); 989 990 #ifdef KSSL_DEBUG 991 printf ("tls1_generate_master_secret() complete\n"); 992 #endif /* KSSL_DEBUG */ 993 return(SSL3_MASTER_SECRET_SIZE); 994 } 995 996 int tls1_alert_code(int code) 997 { 998 switch (code) 999 { 1000 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); 1001 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); 1002 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); 1003 case SSL_AD_DECRYPTION_FAILED: return(TLS1_AD_DECRYPTION_FAILED); 1004 case SSL_AD_RECORD_OVERFLOW: return(TLS1_AD_RECORD_OVERFLOW); 1005 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); 1006 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); 1007 case SSL_AD_NO_CERTIFICATE: return(-1); 1008 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); 1009 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); 1010 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); 1011 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); 1012 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); 1013 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); 1014 case SSL_AD_UNKNOWN_CA: return(TLS1_AD_UNKNOWN_CA); 1015 case SSL_AD_ACCESS_DENIED: return(TLS1_AD_ACCESS_DENIED); 1016 case SSL_AD_DECODE_ERROR: return(TLS1_AD_DECODE_ERROR); 1017 case SSL_AD_DECRYPT_ERROR: return(TLS1_AD_DECRYPT_ERROR); 1018 case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION); 1019 case SSL_AD_PROTOCOL_VERSION: return(TLS1_AD_PROTOCOL_VERSION); 1020 case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY); 1021 case SSL_AD_INTERNAL_ERROR: return(TLS1_AD_INTERNAL_ERROR); 1022 case SSL_AD_USER_CANCELLED: return(TLS1_AD_USER_CANCELLED); 1023 case SSL_AD_NO_RENEGOTIATION: return(TLS1_AD_NO_RENEGOTIATION); 1024 case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION); 1025 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE); 1026 case SSL_AD_UNRECOGNIZED_NAME: return(TLS1_AD_UNRECOGNIZED_NAME); 1027 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE); 1028 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE); 1029 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); 1030 #if 0 /* not appropriate for TLS, not used for DTLS */ 1031 case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return 1032 (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE); 1033 #endif 1034 default: return(-1); 1035 } 1036 } 1037 1038