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