1/* 2 * Copyright (c) 1997 - 2005 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "krb5_locl.h" 35RCSID("$Id: crypto.c 22200 2007-12-07 13:48:01Z lha $"); 36/* RCSID("$FreeBSD$"); */ 37 38#undef CRYPTO_DEBUG 39#ifdef CRYPTO_DEBUG 40static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*); 41#endif 42 43 44struct key_data { 45 krb5_keyblock *key; 46 krb5_data *schedule; 47}; 48 49struct key_usage { 50 unsigned usage; 51 struct key_data key; 52}; 53 54struct krb5_crypto_data { 55 struct encryption_type *et; 56 struct key_data key; 57 int num_key_usage; 58 struct key_usage *key_usage; 59}; 60 61#define CRYPTO_ETYPE(C) ((C)->et->type) 62 63/* bits for `flags' below */ 64#define F_KEYED 1 /* checksum is keyed */ 65#define F_CPROOF 2 /* checksum is collision proof */ 66#define F_DERIVED 4 /* uses derived keys */ 67#define F_VARIANT 8 /* uses `variant' keys (6.4.3) */ 68#define F_PSEUDO 16 /* not a real protocol type */ 69#define F_SPECIAL 32 /* backwards */ 70#define F_DISABLED 64 /* enctype/checksum disabled */ 71 72struct salt_type { 73 krb5_salttype type; 74 const char *name; 75 krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data, 76 krb5_salt, krb5_data, krb5_keyblock*); 77}; 78 79struct key_type { 80 krb5_keytype type; /* XXX */ 81 const char *name; 82 size_t bits; 83 size_t size; 84 size_t schedule_size; 85#if 0 86 krb5_enctype best_etype; 87#endif 88 void (*random_key)(krb5_context, krb5_keyblock*); 89 void (*schedule)(krb5_context, struct key_data *); 90 struct salt_type *string_to_key; 91 void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t); 92}; 93 94struct checksum_type { 95 krb5_cksumtype type; 96 const char *name; 97 size_t blocksize; 98 size_t checksumsize; 99 unsigned flags; 100 void (*checksum)(krb5_context context, 101 struct key_data *key, 102 const void *buf, size_t len, 103 unsigned usage, 104 Checksum *csum); 105 krb5_error_code (*verify)(krb5_context context, 106 struct key_data *key, 107 const void *buf, size_t len, 108 unsigned usage, 109 Checksum *csum); 110}; 111 112struct encryption_type { 113 krb5_enctype type; 114 const char *name; 115 heim_oid *oid; 116 size_t blocksize; 117 size_t padsize; 118 size_t confoundersize; 119 struct key_type *keytype; 120 struct checksum_type *checksum; 121 struct checksum_type *keyed_checksum; 122 unsigned flags; 123 krb5_error_code (*encrypt)(krb5_context context, 124 struct key_data *key, 125 void *data, size_t len, 126 krb5_boolean encryptp, 127 int usage, 128 void *ivec); 129 size_t prf_length; 130 krb5_error_code (*prf)(krb5_context, 131 krb5_crypto, const krb5_data *, krb5_data *); 132}; 133 134#define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA) 135#define INTEGRITY_USAGE(U) (((U) << 8) | 0x55) 136#define CHECKSUM_USAGE(U) (((U) << 8) | 0x99) 137 138static struct checksum_type *_find_checksum(krb5_cksumtype type); 139static struct encryption_type *_find_enctype(krb5_enctype type); 140static struct key_type *_find_keytype(krb5_keytype type); 141static krb5_error_code _get_derived_key(krb5_context, krb5_crypto, 142 unsigned, struct key_data**); 143static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage); 144static krb5_error_code derive_key(krb5_context context, 145 struct encryption_type *et, 146 struct key_data *key, 147 const void *constant, 148 size_t len); 149static krb5_error_code hmac(krb5_context context, 150 struct checksum_type *cm, 151 const void *data, 152 size_t len, 153 unsigned usage, 154 struct key_data *keyblock, 155 Checksum *result); 156static void free_key_data(krb5_context context, struct key_data *key); 157static krb5_error_code usage2arcfour (krb5_context, unsigned *); 158static void xor (DES_cblock *, const unsigned char *); 159 160/************************************************************ 161 * * 162 ************************************************************/ 163 164static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER; 165 166 167static void 168krb5_DES_random_key(krb5_context context, 169 krb5_keyblock *key) 170{ 171 DES_cblock *k = key->keyvalue.data; 172 do { 173 krb5_generate_random_block(k, sizeof(DES_cblock)); 174 DES_set_odd_parity(k); 175 } while(DES_is_weak_key(k)); 176} 177 178static void 179krb5_DES_schedule(krb5_context context, 180 struct key_data *key) 181{ 182 DES_set_key(key->key->keyvalue.data, key->schedule->data); 183} 184 185#ifdef ENABLE_AFS_STRING_TO_KEY 186 187/* This defines the Andrew string_to_key function. It accepts a password 188 * string as input and converts it via a one-way encryption algorithm to a DES 189 * encryption key. It is compatible with the original Andrew authentication 190 * service password database. 191 */ 192 193/* 194 * Short passwords, i.e 8 characters or less. 195 */ 196static void 197krb5_DES_AFS3_CMU_string_to_key (krb5_data pw, 198 krb5_data cell, 199 DES_cblock *key) 200{ 201 char password[8+1]; /* crypt is limited to 8 chars anyway */ 202 int i; 203 204 for(i = 0; i < 8; i++) { 205 char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^ 206 ((i < cell.length) ? 207 tolower(((unsigned char*)cell.data)[i]) : 0); 208 password[i] = c ? c : 'X'; 209 } 210 password[8] = '\0'; 211 212 memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock)); 213 214 /* parity is inserted into the LSB so left shift each byte up one 215 bit. This allows ascii characters with a zero MSB to retain as 216 much significance as possible. */ 217 for (i = 0; i < sizeof(DES_cblock); i++) 218 ((unsigned char*)key)[i] <<= 1; 219 DES_set_odd_parity (key); 220} 221 222/* 223 * Long passwords, i.e 9 characters or more. 224 */ 225static void 226krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw, 227 krb5_data cell, 228 DES_cblock *key) 229{ 230 DES_key_schedule schedule; 231 DES_cblock temp_key; 232 DES_cblock ivec; 233 char password[512]; 234 size_t passlen; 235 236 memcpy(password, pw.data, min(pw.length, sizeof(password))); 237 if(pw.length < sizeof(password)) { 238 int len = min(cell.length, sizeof(password) - pw.length); 239 int i; 240 241 memcpy(password + pw.length, cell.data, len); 242 for (i = pw.length; i < pw.length + len; ++i) 243 password[i] = tolower((unsigned char)password[i]); 244 } 245 passlen = min(sizeof(password), pw.length + cell.length); 246 memcpy(&ivec, "kerberos", 8); 247 memcpy(&temp_key, "kerberos", 8); 248 DES_set_odd_parity (&temp_key); 249 DES_set_key (&temp_key, &schedule); 250 DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec); 251 252 memcpy(&temp_key, &ivec, 8); 253 DES_set_odd_parity (&temp_key); 254 DES_set_key (&temp_key, &schedule); 255 DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec); 256 memset(&schedule, 0, sizeof(schedule)); 257 memset(&temp_key, 0, sizeof(temp_key)); 258 memset(&ivec, 0, sizeof(ivec)); 259 memset(password, 0, sizeof(password)); 260 261 DES_set_odd_parity (key); 262} 263 264static krb5_error_code 265DES_AFS3_string_to_key(krb5_context context, 266 krb5_enctype enctype, 267 krb5_data password, 268 krb5_salt salt, 269 krb5_data opaque, 270 krb5_keyblock *key) 271{ 272 DES_cblock tmp; 273 if(password.length > 8) 274 krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp); 275 else 276 krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp); 277 key->keytype = enctype; 278 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp)); 279 memset(&key, 0, sizeof(key)); 280 return 0; 281} 282#endif /* ENABLE_AFS_STRING_TO_KEY */ 283 284static void 285DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key) 286{ 287 DES_key_schedule schedule; 288 int i; 289 int reverse = 0; 290 unsigned char *p; 291 292 unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe, 293 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf }; 294 memset(key, 0, 8); 295 296 p = (unsigned char*)key; 297 for (i = 0; i < length; i++) { 298 unsigned char tmp = data[i]; 299 if (!reverse) 300 *p++ ^= (tmp << 1); 301 else 302 *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4]; 303 if((i % 8) == 7) 304 reverse = !reverse; 305 } 306 DES_set_odd_parity(key); 307 if(DES_is_weak_key(key)) 308 (*key)[7] ^= 0xF0; 309 DES_set_key(key, &schedule); 310 DES_cbc_cksum((void*)data, key, length, &schedule, key); 311 memset(&schedule, 0, sizeof(schedule)); 312 DES_set_odd_parity(key); 313 if(DES_is_weak_key(key)) 314 (*key)[7] ^= 0xF0; 315} 316 317static krb5_error_code 318krb5_DES_string_to_key(krb5_context context, 319 krb5_enctype enctype, 320 krb5_data password, 321 krb5_salt salt, 322 krb5_data opaque, 323 krb5_keyblock *key) 324{ 325 unsigned char *s; 326 size_t len; 327 DES_cblock tmp; 328 329#ifdef ENABLE_AFS_STRING_TO_KEY 330 if (opaque.length == 1) { 331 unsigned long v; 332 _krb5_get_int(opaque.data, &v, 1); 333 if (v == 1) 334 return DES_AFS3_string_to_key(context, enctype, password, 335 salt, opaque, key); 336 } 337#endif 338 339 len = password.length + salt.saltvalue.length; 340 s = malloc(len); 341 if(len > 0 && s == NULL) { 342 krb5_set_error_string(context, "malloc: out of memory"); 343 return ENOMEM; 344 } 345 memcpy(s, password.data, password.length); 346 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length); 347 DES_string_to_key_int(s, len, &tmp); 348 key->keytype = enctype; 349 krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp)); 350 memset(&tmp, 0, sizeof(tmp)); 351 memset(s, 0, len); 352 free(s); 353 return 0; 354} 355 356static void 357krb5_DES_random_to_key(krb5_context context, 358 krb5_keyblock *key, 359 const void *data, 360 size_t size) 361{ 362 DES_cblock *k = key->keyvalue.data; 363 memcpy(k, data, key->keyvalue.length); 364 DES_set_odd_parity(k); 365 if(DES_is_weak_key(k)) 366 xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 367} 368 369/* 370 * 371 */ 372 373static void 374DES3_random_key(krb5_context context, 375 krb5_keyblock *key) 376{ 377 DES_cblock *k = key->keyvalue.data; 378 do { 379 krb5_generate_random_block(k, 3 * sizeof(DES_cblock)); 380 DES_set_odd_parity(&k[0]); 381 DES_set_odd_parity(&k[1]); 382 DES_set_odd_parity(&k[2]); 383 } while(DES_is_weak_key(&k[0]) || 384 DES_is_weak_key(&k[1]) || 385 DES_is_weak_key(&k[2])); 386} 387 388static void 389DES3_schedule(krb5_context context, 390 struct key_data *key) 391{ 392 DES_cblock *k = key->key->keyvalue.data; 393 DES_key_schedule *s = key->schedule->data; 394 DES_set_key(&k[0], &s[0]); 395 DES_set_key(&k[1], &s[1]); 396 DES_set_key(&k[2], &s[2]); 397} 398 399/* 400 * A = A xor B. A & B are 8 bytes. 401 */ 402 403static void 404xor (DES_cblock *key, const unsigned char *b) 405{ 406 unsigned char *a = (unsigned char*)key; 407 a[0] ^= b[0]; 408 a[1] ^= b[1]; 409 a[2] ^= b[2]; 410 a[3] ^= b[3]; 411 a[4] ^= b[4]; 412 a[5] ^= b[5]; 413 a[6] ^= b[6]; 414 a[7] ^= b[7]; 415} 416 417static krb5_error_code 418DES3_string_to_key(krb5_context context, 419 krb5_enctype enctype, 420 krb5_data password, 421 krb5_salt salt, 422 krb5_data opaque, 423 krb5_keyblock *key) 424{ 425 char *str; 426 size_t len; 427 unsigned char tmp[24]; 428 DES_cblock keys[3]; 429 krb5_error_code ret; 430 431 len = password.length + salt.saltvalue.length; 432 str = malloc(len); 433 if(len != 0 && str == NULL) { 434 krb5_set_error_string(context, "malloc: out of memory"); 435 return ENOMEM; 436 } 437 memcpy(str, password.data, password.length); 438 memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length); 439 { 440 DES_cblock ivec; 441 DES_key_schedule s[3]; 442 int i; 443 444 ret = _krb5_n_fold(str, len, tmp, 24); 445 if (ret) { 446 memset(str, 0, len); 447 free(str); 448 krb5_set_error_string(context, "out of memory"); 449 return ret; 450 } 451 452 for(i = 0; i < 3; i++){ 453 memcpy(keys + i, tmp + i * 8, sizeof(keys[i])); 454 DES_set_odd_parity(keys + i); 455 if(DES_is_weak_key(keys + i)) 456 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 457 DES_set_key(keys + i, &s[i]); 458 } 459 memset(&ivec, 0, sizeof(ivec)); 460 DES_ede3_cbc_encrypt(tmp, 461 tmp, sizeof(tmp), 462 &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT); 463 memset(s, 0, sizeof(s)); 464 memset(&ivec, 0, sizeof(ivec)); 465 for(i = 0; i < 3; i++){ 466 memcpy(keys + i, tmp + i * 8, sizeof(keys[i])); 467 DES_set_odd_parity(keys + i); 468 if(DES_is_weak_key(keys + i)) 469 xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 470 } 471 memset(tmp, 0, sizeof(tmp)); 472 } 473 key->keytype = enctype; 474 krb5_data_copy(&key->keyvalue, keys, sizeof(keys)); 475 memset(keys, 0, sizeof(keys)); 476 memset(str, 0, len); 477 free(str); 478 return 0; 479} 480 481static krb5_error_code 482DES3_string_to_key_derived(krb5_context context, 483 krb5_enctype enctype, 484 krb5_data password, 485 krb5_salt salt, 486 krb5_data opaque, 487 krb5_keyblock *key) 488{ 489 krb5_error_code ret; 490 size_t len = password.length + salt.saltvalue.length; 491 char *s; 492 493 s = malloc(len); 494 if(len != 0 && s == NULL) { 495 krb5_set_error_string(context, "malloc: out of memory"); 496 return ENOMEM; 497 } 498 memcpy(s, password.data, password.length); 499 memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length); 500 ret = krb5_string_to_key_derived(context, 501 s, 502 len, 503 enctype, 504 key); 505 memset(s, 0, len); 506 free(s); 507 return ret; 508} 509 510static void 511DES3_random_to_key(krb5_context context, 512 krb5_keyblock *key, 513 const void *data, 514 size_t size) 515{ 516 unsigned char *x = key->keyvalue.data; 517 const u_char *q = data; 518 DES_cblock *k; 519 int i, j; 520 521 memset(x, 0, sizeof(x)); 522 for (i = 0; i < 3; ++i) { 523 unsigned char foo; 524 for (j = 0; j < 7; ++j) { 525 unsigned char b = q[7 * i + j]; 526 527 x[8 * i + j] = b; 528 } 529 foo = 0; 530 for (j = 6; j >= 0; --j) { 531 foo |= q[7 * i + j] & 1; 532 foo <<= 1; 533 } 534 x[8 * i + 7] = foo; 535 } 536 k = key->keyvalue.data; 537 for (i = 0; i < 3; i++) { 538 DES_set_odd_parity(&k[i]); 539 if(DES_is_weak_key(&k[i])) 540 xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0"); 541 } 542} 543 544/* 545 * ARCFOUR 546 */ 547 548static void 549ARCFOUR_schedule(krb5_context context, 550 struct key_data *kd) 551{ 552 RC4_set_key (kd->schedule->data, 553 kd->key->keyvalue.length, kd->key->keyvalue.data); 554} 555 556static krb5_error_code 557ARCFOUR_string_to_key(krb5_context context, 558 krb5_enctype enctype, 559 krb5_data password, 560 krb5_salt salt, 561 krb5_data opaque, 562 krb5_keyblock *key) 563{ 564 char *s, *p; 565 size_t len; 566 int i; 567 MD4_CTX m; 568 krb5_error_code ret; 569 570 len = 2 * password.length; 571 s = malloc (len); 572 if (len != 0 && s == NULL) { 573 krb5_set_error_string(context, "malloc: out of memory"); 574 ret = ENOMEM; 575 goto out; 576 } 577 for (p = s, i = 0; i < password.length; ++i) { 578 *p++ = ((char *)password.data)[i]; 579 *p++ = 0; 580 } 581 MD4_Init (&m); 582 MD4_Update (&m, s, len); 583 key->keytype = enctype; 584 ret = krb5_data_alloc (&key->keyvalue, 16); 585 if (ret) { 586 krb5_set_error_string(context, "malloc: out of memory"); 587 goto out; 588 } 589 MD4_Final (key->keyvalue.data, &m); 590 memset (s, 0, len); 591 ret = 0; 592out: 593 free (s); 594 return ret; 595} 596 597/* 598 * AES 599 */ 600 601int _krb5_AES_string_to_default_iterator = 4096; 602 603static krb5_error_code 604AES_string_to_key(krb5_context context, 605 krb5_enctype enctype, 606 krb5_data password, 607 krb5_salt salt, 608 krb5_data opaque, 609 krb5_keyblock *key) 610{ 611 krb5_error_code ret; 612 uint32_t iter; 613 struct encryption_type *et; 614 struct key_data kd; 615 616 if (opaque.length == 0) 617 iter = _krb5_AES_string_to_default_iterator; 618 else if (opaque.length == 4) { 619 unsigned long v; 620 _krb5_get_int(opaque.data, &v, 4); 621 iter = ((uint32_t)v); 622 } else 623 return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */ 624 625 et = _find_enctype(enctype); 626 if (et == NULL) 627 return KRB5_PROG_KEYTYPE_NOSUPP; 628 629 kd.schedule = NULL; 630 ALLOC(kd.key, 1); 631 if(kd.key == NULL) { 632 krb5_set_error_string (context, "malloc: out of memory"); 633 return ENOMEM; 634 } 635 kd.key->keytype = enctype; 636 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size); 637 if (ret) { 638 krb5_set_error_string(context, "Failed to allocate pkcs5 key"); 639 return ret; 640 } 641 642 ret = PKCS5_PBKDF2_HMAC_SHA1(password.data, password.length, 643 salt.saltvalue.data, salt.saltvalue.length, 644 iter, 645 et->keytype->size, kd.key->keyvalue.data); 646 if (ret != 1) { 647 free_key_data(context, &kd); 648 krb5_set_error_string(context, "Error calculating s2k"); 649 return KRB5_PROG_KEYTYPE_NOSUPP; 650 } 651 652 ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos")); 653 if (ret == 0) 654 ret = krb5_copy_keyblock_contents(context, kd.key, key); 655 free_key_data(context, &kd); 656 657 return ret; 658} 659 660struct krb5_aes_schedule { 661 AES_KEY ekey; 662 AES_KEY dkey; 663}; 664 665static void 666AES_schedule(krb5_context context, 667 struct key_data *kd) 668{ 669 struct krb5_aes_schedule *key = kd->schedule->data; 670 int bits = kd->key->keyvalue.length * 8; 671 672 memset(key, 0, sizeof(*key)); 673 AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey); 674 AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey); 675} 676 677/* 678 * 679 */ 680 681static struct salt_type des_salt[] = { 682 { 683 KRB5_PW_SALT, 684 "pw-salt", 685 krb5_DES_string_to_key 686 }, 687#ifdef ENABLE_AFS_STRING_TO_KEY 688 { 689 KRB5_AFS3_SALT, 690 "afs3-salt", 691 DES_AFS3_string_to_key 692 }, 693#endif 694 { 0 } 695}; 696 697static struct salt_type des3_salt[] = { 698 { 699 KRB5_PW_SALT, 700 "pw-salt", 701 DES3_string_to_key 702 }, 703 { 0 } 704}; 705 706static struct salt_type des3_salt_derived[] = { 707 { 708 KRB5_PW_SALT, 709 "pw-salt", 710 DES3_string_to_key_derived 711 }, 712 { 0 } 713}; 714 715static struct salt_type AES_salt[] = { 716 { 717 KRB5_PW_SALT, 718 "pw-salt", 719 AES_string_to_key 720 }, 721 { 0 } 722}; 723 724static struct salt_type arcfour_salt[] = { 725 { 726 KRB5_PW_SALT, 727 "pw-salt", 728 ARCFOUR_string_to_key 729 }, 730 { 0 } 731}; 732 733/* 734 * 735 */ 736 737static struct key_type keytype_null = { 738 KEYTYPE_NULL, 739 "null", 740 0, 741 0, 742 0, 743 NULL, 744 NULL, 745 NULL 746}; 747 748static struct key_type keytype_des = { 749 KEYTYPE_DES, 750 "des", 751 56, 752 sizeof(DES_cblock), 753 sizeof(DES_key_schedule), 754 krb5_DES_random_key, 755 krb5_DES_schedule, 756 des_salt, 757 krb5_DES_random_to_key 758}; 759 760static struct key_type keytype_des3 = { 761 KEYTYPE_DES3, 762 "des3", 763 168, 764 3 * sizeof(DES_cblock), 765 3 * sizeof(DES_key_schedule), 766 DES3_random_key, 767 DES3_schedule, 768 des3_salt, 769 DES3_random_to_key 770}; 771 772static struct key_type keytype_des3_derived = { 773 KEYTYPE_DES3, 774 "des3", 775 168, 776 3 * sizeof(DES_cblock), 777 3 * sizeof(DES_key_schedule), 778 DES3_random_key, 779 DES3_schedule, 780 des3_salt_derived, 781 DES3_random_to_key 782}; 783 784static struct key_type keytype_aes128 = { 785 KEYTYPE_AES128, 786 "aes-128", 787 128, 788 16, 789 sizeof(struct krb5_aes_schedule), 790 NULL, 791 AES_schedule, 792 AES_salt 793}; 794 795static struct key_type keytype_aes256 = { 796 KEYTYPE_AES256, 797 "aes-256", 798 256, 799 32, 800 sizeof(struct krb5_aes_schedule), 801 NULL, 802 AES_schedule, 803 AES_salt 804}; 805 806static struct key_type keytype_arcfour = { 807 KEYTYPE_ARCFOUR, 808 "arcfour", 809 128, 810 16, 811 sizeof(RC4_KEY), 812 NULL, 813 ARCFOUR_schedule, 814 arcfour_salt 815}; 816 817static struct key_type *keytypes[] = { 818 &keytype_null, 819 &keytype_des, 820 &keytype_des3_derived, 821 &keytype_des3, 822 &keytype_aes128, 823 &keytype_aes256, 824 &keytype_arcfour 825}; 826 827static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]); 828 829static struct key_type * 830_find_keytype(krb5_keytype type) 831{ 832 int i; 833 for(i = 0; i < num_keytypes; i++) 834 if(keytypes[i]->type == type) 835 return keytypes[i]; 836 return NULL; 837} 838 839 840krb5_error_code KRB5_LIB_FUNCTION 841krb5_salttype_to_string (krb5_context context, 842 krb5_enctype etype, 843 krb5_salttype stype, 844 char **string) 845{ 846 struct encryption_type *e; 847 struct salt_type *st; 848 849 e = _find_enctype (etype); 850 if (e == NULL) { 851 krb5_set_error_string(context, "encryption type %d not supported", 852 etype); 853 return KRB5_PROG_ETYPE_NOSUPP; 854 } 855 for (st = e->keytype->string_to_key; st && st->type; st++) { 856 if (st->type == stype) { 857 *string = strdup (st->name); 858 if (*string == NULL) { 859 krb5_set_error_string(context, "malloc: out of memory"); 860 return ENOMEM; 861 } 862 return 0; 863 } 864 } 865 krb5_set_error_string(context, "salttype %d not supported", stype); 866 return HEIM_ERR_SALTTYPE_NOSUPP; 867} 868 869krb5_error_code KRB5_LIB_FUNCTION 870krb5_string_to_salttype (krb5_context context, 871 krb5_enctype etype, 872 const char *string, 873 krb5_salttype *salttype) 874{ 875 struct encryption_type *e; 876 struct salt_type *st; 877 878 e = _find_enctype (etype); 879 if (e == NULL) { 880 krb5_set_error_string(context, "encryption type %d not supported", 881 etype); 882 return KRB5_PROG_ETYPE_NOSUPP; 883 } 884 for (st = e->keytype->string_to_key; st && st->type; st++) { 885 if (strcasecmp (st->name, string) == 0) { 886 *salttype = st->type; 887 return 0; 888 } 889 } 890 krb5_set_error_string(context, "salttype %s not supported", string); 891 return HEIM_ERR_SALTTYPE_NOSUPP; 892} 893 894krb5_error_code KRB5_LIB_FUNCTION 895krb5_get_pw_salt(krb5_context context, 896 krb5_const_principal principal, 897 krb5_salt *salt) 898{ 899 size_t len; 900 int i; 901 krb5_error_code ret; 902 char *p; 903 904 salt->salttype = KRB5_PW_SALT; 905 len = strlen(principal->realm); 906 for (i = 0; i < principal->name.name_string.len; ++i) 907 len += strlen(principal->name.name_string.val[i]); 908 ret = krb5_data_alloc (&salt->saltvalue, len); 909 if (ret) 910 return ret; 911 p = salt->saltvalue.data; 912 memcpy (p, principal->realm, strlen(principal->realm)); 913 p += strlen(principal->realm); 914 for (i = 0; i < principal->name.name_string.len; ++i) { 915 memcpy (p, 916 principal->name.name_string.val[i], 917 strlen(principal->name.name_string.val[i])); 918 p += strlen(principal->name.name_string.val[i]); 919 } 920 return 0; 921} 922 923krb5_error_code KRB5_LIB_FUNCTION 924krb5_free_salt(krb5_context context, 925 krb5_salt salt) 926{ 927 krb5_data_free(&salt.saltvalue); 928 return 0; 929} 930 931krb5_error_code KRB5_LIB_FUNCTION 932krb5_string_to_key_data (krb5_context context, 933 krb5_enctype enctype, 934 krb5_data password, 935 krb5_principal principal, 936 krb5_keyblock *key) 937{ 938 krb5_error_code ret; 939 krb5_salt salt; 940 941 ret = krb5_get_pw_salt(context, principal, &salt); 942 if(ret) 943 return ret; 944 ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key); 945 krb5_free_salt(context, salt); 946 return ret; 947} 948 949krb5_error_code KRB5_LIB_FUNCTION 950krb5_string_to_key (krb5_context context, 951 krb5_enctype enctype, 952 const char *password, 953 krb5_principal principal, 954 krb5_keyblock *key) 955{ 956 krb5_data pw; 957 pw.data = rk_UNCONST(password); 958 pw.length = strlen(password); 959 return krb5_string_to_key_data(context, enctype, pw, principal, key); 960} 961 962krb5_error_code KRB5_LIB_FUNCTION 963krb5_string_to_key_data_salt (krb5_context context, 964 krb5_enctype enctype, 965 krb5_data password, 966 krb5_salt salt, 967 krb5_keyblock *key) 968{ 969 krb5_data opaque; 970 krb5_data_zero(&opaque); 971 return krb5_string_to_key_data_salt_opaque(context, enctype, password, 972 salt, opaque, key); 973} 974 975/* 976 * Do a string -> key for encryption type `enctype' operation on 977 * `password' (with salt `salt' and the enctype specific data string 978 * `opaque'), returning the resulting key in `key' 979 */ 980 981krb5_error_code KRB5_LIB_FUNCTION 982krb5_string_to_key_data_salt_opaque (krb5_context context, 983 krb5_enctype enctype, 984 krb5_data password, 985 krb5_salt salt, 986 krb5_data opaque, 987 krb5_keyblock *key) 988{ 989 struct encryption_type *et =_find_enctype(enctype); 990 struct salt_type *st; 991 if(et == NULL) { 992 krb5_set_error_string(context, "encryption type %d not supported", 993 enctype); 994 return KRB5_PROG_ETYPE_NOSUPP; 995 } 996 for(st = et->keytype->string_to_key; st && st->type; st++) 997 if(st->type == salt.salttype) 998 return (*st->string_to_key)(context, enctype, password, 999 salt, opaque, key); 1000 krb5_set_error_string(context, "salt type %d not supported", 1001 salt.salttype); 1002 return HEIM_ERR_SALTTYPE_NOSUPP; 1003} 1004 1005/* 1006 * Do a string -> key for encryption type `enctype' operation on the 1007 * string `password' (with salt `salt'), returning the resulting key 1008 * in `key' 1009 */ 1010 1011krb5_error_code KRB5_LIB_FUNCTION 1012krb5_string_to_key_salt (krb5_context context, 1013 krb5_enctype enctype, 1014 const char *password, 1015 krb5_salt salt, 1016 krb5_keyblock *key) 1017{ 1018 krb5_data pw; 1019 pw.data = rk_UNCONST(password); 1020 pw.length = strlen(password); 1021 return krb5_string_to_key_data_salt(context, enctype, pw, salt, key); 1022} 1023 1024krb5_error_code KRB5_LIB_FUNCTION 1025krb5_string_to_key_salt_opaque (krb5_context context, 1026 krb5_enctype enctype, 1027 const char *password, 1028 krb5_salt salt, 1029 krb5_data opaque, 1030 krb5_keyblock *key) 1031{ 1032 krb5_data pw; 1033 pw.data = rk_UNCONST(password); 1034 pw.length = strlen(password); 1035 return krb5_string_to_key_data_salt_opaque(context, enctype, 1036 pw, salt, opaque, key); 1037} 1038 1039krb5_error_code KRB5_LIB_FUNCTION 1040krb5_keytype_to_string(krb5_context context, 1041 krb5_keytype keytype, 1042 char **string) 1043{ 1044 struct key_type *kt = _find_keytype(keytype); 1045 if(kt == NULL) { 1046 krb5_set_error_string(context, "key type %d not supported", keytype); 1047 return KRB5_PROG_KEYTYPE_NOSUPP; 1048 } 1049 *string = strdup(kt->name); 1050 if(*string == NULL) { 1051 krb5_set_error_string(context, "malloc: out of memory"); 1052 return ENOMEM; 1053 } 1054 return 0; 1055} 1056 1057krb5_error_code KRB5_LIB_FUNCTION 1058krb5_string_to_keytype(krb5_context context, 1059 const char *string, 1060 krb5_keytype *keytype) 1061{ 1062 int i; 1063 for(i = 0; i < num_keytypes; i++) 1064 if(strcasecmp(keytypes[i]->name, string) == 0){ 1065 *keytype = keytypes[i]->type; 1066 return 0; 1067 } 1068 krb5_set_error_string(context, "key type %s not supported", string); 1069 return KRB5_PROG_KEYTYPE_NOSUPP; 1070} 1071 1072krb5_error_code KRB5_LIB_FUNCTION 1073krb5_enctype_keysize(krb5_context context, 1074 krb5_enctype type, 1075 size_t *keysize) 1076{ 1077 struct encryption_type *et = _find_enctype(type); 1078 if(et == NULL) { 1079 krb5_set_error_string(context, "encryption type %d not supported", 1080 type); 1081 return KRB5_PROG_ETYPE_NOSUPP; 1082 } 1083 *keysize = et->keytype->size; 1084 return 0; 1085} 1086 1087krb5_error_code KRB5_LIB_FUNCTION 1088krb5_enctype_keybits(krb5_context context, 1089 krb5_enctype type, 1090 size_t *keybits) 1091{ 1092 struct encryption_type *et = _find_enctype(type); 1093 if(et == NULL) { 1094 krb5_set_error_string(context, "encryption type %d not supported", 1095 type); 1096 return KRB5_PROG_ETYPE_NOSUPP; 1097 } 1098 *keybits = et->keytype->bits; 1099 return 0; 1100} 1101 1102krb5_error_code KRB5_LIB_FUNCTION 1103krb5_generate_random_keyblock(krb5_context context, 1104 krb5_enctype type, 1105 krb5_keyblock *key) 1106{ 1107 krb5_error_code ret; 1108 struct encryption_type *et = _find_enctype(type); 1109 if(et == NULL) { 1110 krb5_set_error_string(context, "encryption type %d not supported", 1111 type); 1112 return KRB5_PROG_ETYPE_NOSUPP; 1113 } 1114 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size); 1115 if(ret) 1116 return ret; 1117 key->keytype = type; 1118 if(et->keytype->random_key) 1119 (*et->keytype->random_key)(context, key); 1120 else 1121 krb5_generate_random_block(key->keyvalue.data, 1122 key->keyvalue.length); 1123 return 0; 1124} 1125 1126static krb5_error_code 1127_key_schedule(krb5_context context, 1128 struct key_data *key) 1129{ 1130 krb5_error_code ret; 1131 struct encryption_type *et = _find_enctype(key->key->keytype); 1132 struct key_type *kt = et->keytype; 1133 1134 if(kt->schedule == NULL) 1135 return 0; 1136 if (key->schedule != NULL) 1137 return 0; 1138 ALLOC(key->schedule, 1); 1139 if(key->schedule == NULL) { 1140 krb5_set_error_string(context, "malloc: out of memory"); 1141 return ENOMEM; 1142 } 1143 ret = krb5_data_alloc(key->schedule, kt->schedule_size); 1144 if(ret) { 1145 free(key->schedule); 1146 key->schedule = NULL; 1147 return ret; 1148 } 1149 (*kt->schedule)(context, key); 1150 return 0; 1151} 1152 1153/************************************************************ 1154 * * 1155 ************************************************************/ 1156 1157static void 1158NONE_checksum(krb5_context context, 1159 struct key_data *key, 1160 const void *data, 1161 size_t len, 1162 unsigned usage, 1163 Checksum *C) 1164{ 1165} 1166 1167static void 1168CRC32_checksum(krb5_context context, 1169 struct key_data *key, 1170 const void *data, 1171 size_t len, 1172 unsigned usage, 1173 Checksum *C) 1174{ 1175 uint32_t crc; 1176 unsigned char *r = C->checksum.data; 1177 _krb5_crc_init_table (); 1178 crc = _krb5_crc_update (data, len, 0); 1179 r[0] = crc & 0xff; 1180 r[1] = (crc >> 8) & 0xff; 1181 r[2] = (crc >> 16) & 0xff; 1182 r[3] = (crc >> 24) & 0xff; 1183} 1184 1185static void 1186RSA_MD4_checksum(krb5_context context, 1187 struct key_data *key, 1188 const void *data, 1189 size_t len, 1190 unsigned usage, 1191 Checksum *C) 1192{ 1193 MD4_CTX m; 1194 1195 MD4_Init (&m); 1196 MD4_Update (&m, data, len); 1197 MD4_Final (C->checksum.data, &m); 1198} 1199 1200static void 1201RSA_MD4_DES_checksum(krb5_context context, 1202 struct key_data *key, 1203 const void *data, 1204 size_t len, 1205 unsigned usage, 1206 Checksum *cksum) 1207{ 1208 MD4_CTX md4; 1209 DES_cblock ivec; 1210 unsigned char *p = cksum->checksum.data; 1211 1212 krb5_generate_random_block(p, 8); 1213 MD4_Init (&md4); 1214 MD4_Update (&md4, p, 8); 1215 MD4_Update (&md4, data, len); 1216 MD4_Final (p + 8, &md4); 1217 memset (&ivec, 0, sizeof(ivec)); 1218 DES_cbc_encrypt(p, 1219 p, 1220 24, 1221 key->schedule->data, 1222 &ivec, 1223 DES_ENCRYPT); 1224} 1225 1226static krb5_error_code 1227RSA_MD4_DES_verify(krb5_context context, 1228 struct key_data *key, 1229 const void *data, 1230 size_t len, 1231 unsigned usage, 1232 Checksum *C) 1233{ 1234 MD4_CTX md4; 1235 unsigned char tmp[24]; 1236 unsigned char res[16]; 1237 DES_cblock ivec; 1238 krb5_error_code ret = 0; 1239 1240 memset(&ivec, 0, sizeof(ivec)); 1241 DES_cbc_encrypt(C->checksum.data, 1242 (void*)tmp, 1243 C->checksum.length, 1244 key->schedule->data, 1245 &ivec, 1246 DES_DECRYPT); 1247 MD4_Init (&md4); 1248 MD4_Update (&md4, tmp, 8); /* confounder */ 1249 MD4_Update (&md4, data, len); 1250 MD4_Final (res, &md4); 1251 if(memcmp(res, tmp + 8, sizeof(res)) != 0) { 1252 krb5_clear_error_string (context); 1253 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 1254 } 1255 memset(tmp, 0, sizeof(tmp)); 1256 memset(res, 0, sizeof(res)); 1257 return ret; 1258} 1259 1260static void 1261RSA_MD5_checksum(krb5_context context, 1262 struct key_data *key, 1263 const void *data, 1264 size_t len, 1265 unsigned usage, 1266 Checksum *C) 1267{ 1268 MD5_CTX m; 1269 1270 MD5_Init (&m); 1271 MD5_Update(&m, data, len); 1272 MD5_Final (C->checksum.data, &m); 1273} 1274 1275static void 1276RSA_MD5_DES_checksum(krb5_context context, 1277 struct key_data *key, 1278 const void *data, 1279 size_t len, 1280 unsigned usage, 1281 Checksum *C) 1282{ 1283 MD5_CTX md5; 1284 DES_cblock ivec; 1285 unsigned char *p = C->checksum.data; 1286 1287 krb5_generate_random_block(p, 8); 1288 MD5_Init (&md5); 1289 MD5_Update (&md5, p, 8); 1290 MD5_Update (&md5, data, len); 1291 MD5_Final (p + 8, &md5); 1292 memset (&ivec, 0, sizeof(ivec)); 1293 DES_cbc_encrypt(p, 1294 p, 1295 24, 1296 key->schedule->data, 1297 &ivec, 1298 DES_ENCRYPT); 1299} 1300 1301static krb5_error_code 1302RSA_MD5_DES_verify(krb5_context context, 1303 struct key_data *key, 1304 const void *data, 1305 size_t len, 1306 unsigned usage, 1307 Checksum *C) 1308{ 1309 MD5_CTX md5; 1310 unsigned char tmp[24]; 1311 unsigned char res[16]; 1312 DES_cblock ivec; 1313 DES_key_schedule *sched = key->schedule->data; 1314 krb5_error_code ret = 0; 1315 1316 memset(&ivec, 0, sizeof(ivec)); 1317 DES_cbc_encrypt(C->checksum.data, 1318 (void*)tmp, 1319 C->checksum.length, 1320 &sched[0], 1321 &ivec, 1322 DES_DECRYPT); 1323 MD5_Init (&md5); 1324 MD5_Update (&md5, tmp, 8); /* confounder */ 1325 MD5_Update (&md5, data, len); 1326 MD5_Final (res, &md5); 1327 if(memcmp(res, tmp + 8, sizeof(res)) != 0) { 1328 krb5_clear_error_string (context); 1329 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 1330 } 1331 memset(tmp, 0, sizeof(tmp)); 1332 memset(res, 0, sizeof(res)); 1333 return ret; 1334} 1335 1336static void 1337RSA_MD5_DES3_checksum(krb5_context context, 1338 struct key_data *key, 1339 const void *data, 1340 size_t len, 1341 unsigned usage, 1342 Checksum *C) 1343{ 1344 MD5_CTX md5; 1345 DES_cblock ivec; 1346 unsigned char *p = C->checksum.data; 1347 DES_key_schedule *sched = key->schedule->data; 1348 1349 krb5_generate_random_block(p, 8); 1350 MD5_Init (&md5); 1351 MD5_Update (&md5, p, 8); 1352 MD5_Update (&md5, data, len); 1353 MD5_Final (p + 8, &md5); 1354 memset (&ivec, 0, sizeof(ivec)); 1355 DES_ede3_cbc_encrypt(p, 1356 p, 1357 24, 1358 &sched[0], &sched[1], &sched[2], 1359 &ivec, 1360 DES_ENCRYPT); 1361} 1362 1363static krb5_error_code 1364RSA_MD5_DES3_verify(krb5_context context, 1365 struct key_data *key, 1366 const void *data, 1367 size_t len, 1368 unsigned usage, 1369 Checksum *C) 1370{ 1371 MD5_CTX md5; 1372 unsigned char tmp[24]; 1373 unsigned char res[16]; 1374 DES_cblock ivec; 1375 DES_key_schedule *sched = key->schedule->data; 1376 krb5_error_code ret = 0; 1377 1378 memset(&ivec, 0, sizeof(ivec)); 1379 DES_ede3_cbc_encrypt(C->checksum.data, 1380 (void*)tmp, 1381 C->checksum.length, 1382 &sched[0], &sched[1], &sched[2], 1383 &ivec, 1384 DES_DECRYPT); 1385 MD5_Init (&md5); 1386 MD5_Update (&md5, tmp, 8); /* confounder */ 1387 MD5_Update (&md5, data, len); 1388 MD5_Final (res, &md5); 1389 if(memcmp(res, tmp + 8, sizeof(res)) != 0) { 1390 krb5_clear_error_string (context); 1391 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 1392 } 1393 memset(tmp, 0, sizeof(tmp)); 1394 memset(res, 0, sizeof(res)); 1395 return ret; 1396} 1397 1398static void 1399SHA1_checksum(krb5_context context, 1400 struct key_data *key, 1401 const void *data, 1402 size_t len, 1403 unsigned usage, 1404 Checksum *C) 1405{ 1406 SHA_CTX m; 1407 1408 SHA1_Init(&m); 1409 SHA1_Update(&m, data, len); 1410 SHA1_Final(C->checksum.data, &m); 1411} 1412 1413/* HMAC according to RFC2104 */ 1414static krb5_error_code 1415hmac(krb5_context context, 1416 struct checksum_type *cm, 1417 const void *data, 1418 size_t len, 1419 unsigned usage, 1420 struct key_data *keyblock, 1421 Checksum *result) 1422{ 1423 unsigned char *ipad, *opad; 1424 unsigned char *key; 1425 size_t key_len; 1426 int i; 1427 1428 ipad = malloc(cm->blocksize + len); 1429 if (ipad == NULL) 1430 return ENOMEM; 1431 opad = malloc(cm->blocksize + cm->checksumsize); 1432 if (opad == NULL) { 1433 free(ipad); 1434 return ENOMEM; 1435 } 1436 memset(ipad, 0x36, cm->blocksize); 1437 memset(opad, 0x5c, cm->blocksize); 1438 1439 if(keyblock->key->keyvalue.length > cm->blocksize){ 1440 (*cm->checksum)(context, 1441 keyblock, 1442 keyblock->key->keyvalue.data, 1443 keyblock->key->keyvalue.length, 1444 usage, 1445 result); 1446 key = result->checksum.data; 1447 key_len = result->checksum.length; 1448 } else { 1449 key = keyblock->key->keyvalue.data; 1450 key_len = keyblock->key->keyvalue.length; 1451 } 1452 for(i = 0; i < key_len; i++){ 1453 ipad[i] ^= key[i]; 1454 opad[i] ^= key[i]; 1455 } 1456 memcpy(ipad + cm->blocksize, data, len); 1457 (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len, 1458 usage, result); 1459 memcpy(opad + cm->blocksize, result->checksum.data, 1460 result->checksum.length); 1461 (*cm->checksum)(context, keyblock, opad, 1462 cm->blocksize + cm->checksumsize, usage, result); 1463 memset(ipad, 0, cm->blocksize + len); 1464 free(ipad); 1465 memset(opad, 0, cm->blocksize + cm->checksumsize); 1466 free(opad); 1467 1468 return 0; 1469} 1470 1471krb5_error_code KRB5_LIB_FUNCTION 1472krb5_hmac(krb5_context context, 1473 krb5_cksumtype cktype, 1474 const void *data, 1475 size_t len, 1476 unsigned usage, 1477 krb5_keyblock *key, 1478 Checksum *result) 1479{ 1480 struct checksum_type *c = _find_checksum(cktype); 1481 struct key_data kd; 1482 krb5_error_code ret; 1483 1484 if (c == NULL) { 1485 krb5_set_error_string (context, "checksum type %d not supported", 1486 cktype); 1487 return KRB5_PROG_SUMTYPE_NOSUPP; 1488 } 1489 1490 kd.key = key; 1491 kd.schedule = NULL; 1492 1493 ret = hmac(context, c, data, len, usage, &kd, result); 1494 1495 if (kd.schedule) 1496 krb5_free_data(context, kd.schedule); 1497 1498 return ret; 1499 } 1500 1501static void 1502SP_HMAC_SHA1_checksum(krb5_context context, 1503 struct key_data *key, 1504 const void *data, 1505 size_t len, 1506 unsigned usage, 1507 Checksum *result) 1508{ 1509 struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1); 1510 Checksum res; 1511 char sha1_data[20]; 1512 krb5_error_code ret; 1513 1514 res.checksum.data = sha1_data; 1515 res.checksum.length = sizeof(sha1_data); 1516 1517 ret = hmac(context, c, data, len, usage, key, &res); 1518 if (ret) 1519 krb5_abortx(context, "hmac failed"); 1520 memcpy(result->checksum.data, res.checksum.data, result->checksum.length); 1521} 1522 1523/* 1524 * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt 1525 */ 1526 1527static void 1528HMAC_MD5_checksum(krb5_context context, 1529 struct key_data *key, 1530 const void *data, 1531 size_t len, 1532 unsigned usage, 1533 Checksum *result) 1534{ 1535 MD5_CTX md5; 1536 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); 1537 const char signature[] = "signaturekey"; 1538 Checksum ksign_c; 1539 struct key_data ksign; 1540 krb5_keyblock kb; 1541 unsigned char t[4]; 1542 unsigned char tmp[16]; 1543 unsigned char ksign_c_data[16]; 1544 krb5_error_code ret; 1545 1546 ksign_c.checksum.length = sizeof(ksign_c_data); 1547 ksign_c.checksum.data = ksign_c_data; 1548 ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c); 1549 if (ret) 1550 krb5_abortx(context, "hmac failed"); 1551 ksign.key = &kb; 1552 kb.keyvalue = ksign_c.checksum; 1553 MD5_Init (&md5); 1554 t[0] = (usage >> 0) & 0xFF; 1555 t[1] = (usage >> 8) & 0xFF; 1556 t[2] = (usage >> 16) & 0xFF; 1557 t[3] = (usage >> 24) & 0xFF; 1558 MD5_Update (&md5, t, 4); 1559 MD5_Update (&md5, data, len); 1560 MD5_Final (tmp, &md5); 1561 ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result); 1562 if (ret) 1563 krb5_abortx(context, "hmac failed"); 1564} 1565 1566/* 1567 * same as previous but being used while encrypting. 1568 */ 1569 1570static void 1571HMAC_MD5_checksum_enc(krb5_context context, 1572 struct key_data *key, 1573 const void *data, 1574 size_t len, 1575 unsigned usage, 1576 Checksum *result) 1577{ 1578 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); 1579 Checksum ksign_c; 1580 struct key_data ksign; 1581 krb5_keyblock kb; 1582 unsigned char t[4]; 1583 unsigned char ksign_c_data[16]; 1584 krb5_error_code ret; 1585 1586 t[0] = (usage >> 0) & 0xFF; 1587 t[1] = (usage >> 8) & 0xFF; 1588 t[2] = (usage >> 16) & 0xFF; 1589 t[3] = (usage >> 24) & 0xFF; 1590 1591 ksign_c.checksum.length = sizeof(ksign_c_data); 1592 ksign_c.checksum.data = ksign_c_data; 1593 ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c); 1594 if (ret) 1595 krb5_abortx(context, "hmac failed"); 1596 ksign.key = &kb; 1597 kb.keyvalue = ksign_c.checksum; 1598 ret = hmac(context, c, data, len, 0, &ksign, result); 1599 if (ret) 1600 krb5_abortx(context, "hmac failed"); 1601} 1602 1603static struct checksum_type checksum_none = { 1604 CKSUMTYPE_NONE, 1605 "none", 1606 1, 1607 0, 1608 0, 1609 NONE_checksum, 1610 NULL 1611}; 1612static struct checksum_type checksum_crc32 = { 1613 CKSUMTYPE_CRC32, 1614 "crc32", 1615 1, 1616 4, 1617 0, 1618 CRC32_checksum, 1619 NULL 1620}; 1621static struct checksum_type checksum_rsa_md4 = { 1622 CKSUMTYPE_RSA_MD4, 1623 "rsa-md4", 1624 64, 1625 16, 1626 F_CPROOF, 1627 RSA_MD4_checksum, 1628 NULL 1629}; 1630static struct checksum_type checksum_rsa_md4_des = { 1631 CKSUMTYPE_RSA_MD4_DES, 1632 "rsa-md4-des", 1633 64, 1634 24, 1635 F_KEYED | F_CPROOF | F_VARIANT, 1636 RSA_MD4_DES_checksum, 1637 RSA_MD4_DES_verify 1638}; 1639#if 0 1640static struct checksum_type checksum_des_mac = { 1641 CKSUMTYPE_DES_MAC, 1642 "des-mac", 1643 0, 1644 0, 1645 0, 1646 DES_MAC_checksum 1647}; 1648static struct checksum_type checksum_des_mac_k = { 1649 CKSUMTYPE_DES_MAC_K, 1650 "des-mac-k", 1651 0, 1652 0, 1653 0, 1654 DES_MAC_K_checksum 1655}; 1656static struct checksum_type checksum_rsa_md4_des_k = { 1657 CKSUMTYPE_RSA_MD4_DES_K, 1658 "rsa-md4-des-k", 1659 0, 1660 0, 1661 0, 1662 RSA_MD4_DES_K_checksum, 1663 RSA_MD4_DES_K_verify 1664}; 1665#endif 1666static struct checksum_type checksum_rsa_md5 = { 1667 CKSUMTYPE_RSA_MD5, 1668 "rsa-md5", 1669 64, 1670 16, 1671 F_CPROOF, 1672 RSA_MD5_checksum, 1673 NULL 1674}; 1675static struct checksum_type checksum_rsa_md5_des = { 1676 CKSUMTYPE_RSA_MD5_DES, 1677 "rsa-md5-des", 1678 64, 1679 24, 1680 F_KEYED | F_CPROOF | F_VARIANT, 1681 RSA_MD5_DES_checksum, 1682 RSA_MD5_DES_verify 1683}; 1684static struct checksum_type checksum_rsa_md5_des3 = { 1685 CKSUMTYPE_RSA_MD5_DES3, 1686 "rsa-md5-des3", 1687 64, 1688 24, 1689 F_KEYED | F_CPROOF | F_VARIANT, 1690 RSA_MD5_DES3_checksum, 1691 RSA_MD5_DES3_verify 1692}; 1693static struct checksum_type checksum_sha1 = { 1694 CKSUMTYPE_SHA1, 1695 "sha1", 1696 64, 1697 20, 1698 F_CPROOF, 1699 SHA1_checksum, 1700 NULL 1701}; 1702static struct checksum_type checksum_hmac_sha1_des3 = { 1703 CKSUMTYPE_HMAC_SHA1_DES3, 1704 "hmac-sha1-des3", 1705 64, 1706 20, 1707 F_KEYED | F_CPROOF | F_DERIVED, 1708 SP_HMAC_SHA1_checksum, 1709 NULL 1710}; 1711 1712static struct checksum_type checksum_hmac_sha1_aes128 = { 1713 CKSUMTYPE_HMAC_SHA1_96_AES_128, 1714 "hmac-sha1-96-aes128", 1715 64, 1716 12, 1717 F_KEYED | F_CPROOF | F_DERIVED, 1718 SP_HMAC_SHA1_checksum, 1719 NULL 1720}; 1721 1722static struct checksum_type checksum_hmac_sha1_aes256 = { 1723 CKSUMTYPE_HMAC_SHA1_96_AES_256, 1724 "hmac-sha1-96-aes256", 1725 64, 1726 12, 1727 F_KEYED | F_CPROOF | F_DERIVED, 1728 SP_HMAC_SHA1_checksum, 1729 NULL 1730}; 1731 1732static struct checksum_type checksum_hmac_md5 = { 1733 CKSUMTYPE_HMAC_MD5, 1734 "hmac-md5", 1735 64, 1736 16, 1737 F_KEYED | F_CPROOF, 1738 HMAC_MD5_checksum, 1739 NULL 1740}; 1741 1742static struct checksum_type checksum_hmac_md5_enc = { 1743 CKSUMTYPE_HMAC_MD5_ENC, 1744 "hmac-md5-enc", 1745 64, 1746 16, 1747 F_KEYED | F_CPROOF | F_PSEUDO, 1748 HMAC_MD5_checksum_enc, 1749 NULL 1750}; 1751 1752static struct checksum_type *checksum_types[] = { 1753 &checksum_none, 1754 &checksum_crc32, 1755 &checksum_rsa_md4, 1756 &checksum_rsa_md4_des, 1757#if 0 1758 &checksum_des_mac, 1759 &checksum_des_mac_k, 1760 &checksum_rsa_md4_des_k, 1761#endif 1762 &checksum_rsa_md5, 1763 &checksum_rsa_md5_des, 1764 &checksum_rsa_md5_des3, 1765 &checksum_sha1, 1766 &checksum_hmac_sha1_des3, 1767 &checksum_hmac_sha1_aes128, 1768 &checksum_hmac_sha1_aes256, 1769 &checksum_hmac_md5, 1770 &checksum_hmac_md5_enc 1771}; 1772 1773static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]); 1774 1775static struct checksum_type * 1776_find_checksum(krb5_cksumtype type) 1777{ 1778 int i; 1779 for(i = 0; i < num_checksums; i++) 1780 if(checksum_types[i]->type == type) 1781 return checksum_types[i]; 1782 return NULL; 1783} 1784 1785static krb5_error_code 1786get_checksum_key(krb5_context context, 1787 krb5_crypto crypto, 1788 unsigned usage, /* not krb5_key_usage */ 1789 struct checksum_type *ct, 1790 struct key_data **key) 1791{ 1792 krb5_error_code ret = 0; 1793 1794 if(ct->flags & F_DERIVED) 1795 ret = _get_derived_key(context, crypto, usage, key); 1796 else if(ct->flags & F_VARIANT) { 1797 int i; 1798 1799 *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */); 1800 if(*key == NULL) { 1801 krb5_set_error_string(context, "malloc: out of memory"); 1802 return ENOMEM; 1803 } 1804 ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key); 1805 if(ret) 1806 return ret; 1807 for(i = 0; i < (*key)->key->keyvalue.length; i++) 1808 ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0; 1809 } else { 1810 *key = &crypto->key; 1811 } 1812 if(ret == 0) 1813 ret = _key_schedule(context, *key); 1814 return ret; 1815} 1816 1817static krb5_error_code 1818create_checksum (krb5_context context, 1819 struct checksum_type *ct, 1820 krb5_crypto crypto, 1821 unsigned usage, 1822 void *data, 1823 size_t len, 1824 Checksum *result) 1825{ 1826 krb5_error_code ret; 1827 struct key_data *dkey; 1828 int keyed_checksum; 1829 1830 if (ct->flags & F_DISABLED) { 1831 krb5_clear_error_string (context); 1832 return KRB5_PROG_SUMTYPE_NOSUPP; 1833 } 1834 keyed_checksum = (ct->flags & F_KEYED) != 0; 1835 if(keyed_checksum && crypto == NULL) { 1836 krb5_set_error_string (context, "Checksum type %s is keyed " 1837 "but no crypto context (key) was passed in", 1838 ct->name); 1839 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */ 1840 } 1841 if(keyed_checksum) { 1842 ret = get_checksum_key(context, crypto, usage, ct, &dkey); 1843 if (ret) 1844 return ret; 1845 } else 1846 dkey = NULL; 1847 result->cksumtype = ct->type; 1848 ret = krb5_data_alloc(&result->checksum, ct->checksumsize); 1849 if (ret) 1850 return (ret); 1851 (*ct->checksum)(context, dkey, data, len, usage, result); 1852 return 0; 1853} 1854 1855static int 1856arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto) 1857{ 1858 return (ct->type == CKSUMTYPE_HMAC_MD5) && 1859 (crypto->key.key->keytype == KEYTYPE_ARCFOUR); 1860} 1861 1862krb5_error_code KRB5_LIB_FUNCTION 1863krb5_create_checksum(krb5_context context, 1864 krb5_crypto crypto, 1865 krb5_key_usage usage, 1866 int type, 1867 void *data, 1868 size_t len, 1869 Checksum *result) 1870{ 1871 struct checksum_type *ct = NULL; 1872 unsigned keyusage; 1873 1874 /* type 0 -> pick from crypto */ 1875 if (type) { 1876 ct = _find_checksum(type); 1877 } else if (crypto) { 1878 ct = crypto->et->keyed_checksum; 1879 if (ct == NULL) 1880 ct = crypto->et->checksum; 1881 } 1882 1883 if(ct == NULL) { 1884 krb5_set_error_string (context, "checksum type %d not supported", 1885 type); 1886 return KRB5_PROG_SUMTYPE_NOSUPP; 1887 } 1888 1889 if (arcfour_checksum_p(ct, crypto)) { 1890 keyusage = usage; 1891 usage2arcfour(context, &keyusage); 1892 } else 1893 keyusage = CHECKSUM_USAGE(usage); 1894 1895 return create_checksum(context, ct, crypto, keyusage, 1896 data, len, result); 1897} 1898 1899static krb5_error_code 1900verify_checksum(krb5_context context, 1901 krb5_crypto crypto, 1902 unsigned usage, /* not krb5_key_usage */ 1903 void *data, 1904 size_t len, 1905 Checksum *cksum) 1906{ 1907 krb5_error_code ret; 1908 struct key_data *dkey; 1909 int keyed_checksum; 1910 Checksum c; 1911 struct checksum_type *ct; 1912 1913 ct = _find_checksum(cksum->cksumtype); 1914 if (ct == NULL || (ct->flags & F_DISABLED)) { 1915 krb5_set_error_string (context, "checksum type %d not supported", 1916 cksum->cksumtype); 1917 return KRB5_PROG_SUMTYPE_NOSUPP; 1918 } 1919 if(ct->checksumsize != cksum->checksum.length) { 1920 krb5_clear_error_string (context); 1921 return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */ 1922 } 1923 keyed_checksum = (ct->flags & F_KEYED) != 0; 1924 if(keyed_checksum && crypto == NULL) { 1925 krb5_set_error_string (context, "Checksum type %s is keyed " 1926 "but no crypto context (key) was passed in", 1927 ct->name); 1928 return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */ 1929 } 1930 if(keyed_checksum) 1931 ret = get_checksum_key(context, crypto, usage, ct, &dkey); 1932 else 1933 dkey = NULL; 1934 if(ct->verify) 1935 return (*ct->verify)(context, dkey, data, len, usage, cksum); 1936 1937 ret = krb5_data_alloc (&c.checksum, ct->checksumsize); 1938 if (ret) 1939 return ret; 1940 1941 (*ct->checksum)(context, dkey, data, len, usage, &c); 1942 1943 if(c.checksum.length != cksum->checksum.length || 1944 memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) { 1945 krb5_clear_error_string (context); 1946 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; 1947 } else { 1948 ret = 0; 1949 } 1950 krb5_data_free (&c.checksum); 1951 return ret; 1952} 1953 1954krb5_error_code KRB5_LIB_FUNCTION 1955krb5_verify_checksum(krb5_context context, 1956 krb5_crypto crypto, 1957 krb5_key_usage usage, 1958 void *data, 1959 size_t len, 1960 Checksum *cksum) 1961{ 1962 struct checksum_type *ct; 1963 unsigned keyusage; 1964 1965 ct = _find_checksum(cksum->cksumtype); 1966 if(ct == NULL) { 1967 krb5_set_error_string (context, "checksum type %d not supported", 1968 cksum->cksumtype); 1969 return KRB5_PROG_SUMTYPE_NOSUPP; 1970 } 1971 1972 if (arcfour_checksum_p(ct, crypto)) { 1973 keyusage = usage; 1974 usage2arcfour(context, &keyusage); 1975 } else 1976 keyusage = CHECKSUM_USAGE(usage); 1977 1978 return verify_checksum(context, crypto, keyusage, 1979 data, len, cksum); 1980} 1981 1982krb5_error_code KRB5_LIB_FUNCTION 1983krb5_crypto_get_checksum_type(krb5_context context, 1984 krb5_crypto crypto, 1985 krb5_cksumtype *type) 1986{ 1987 struct checksum_type *ct = NULL; 1988 1989 if (crypto != NULL) { 1990 ct = crypto->et->keyed_checksum; 1991 if (ct == NULL) 1992 ct = crypto->et->checksum; 1993 } 1994 1995 if (ct == NULL) { 1996 krb5_set_error_string (context, "checksum type not found"); 1997 return KRB5_PROG_SUMTYPE_NOSUPP; 1998 } 1999 2000 *type = ct->type; 2001 2002 return 0; 2003} 2004 2005 2006krb5_error_code KRB5_LIB_FUNCTION 2007krb5_checksumsize(krb5_context context, 2008 krb5_cksumtype type, 2009 size_t *size) 2010{ 2011 struct checksum_type *ct = _find_checksum(type); 2012 if(ct == NULL) { 2013 krb5_set_error_string (context, "checksum type %d not supported", 2014 type); 2015 return KRB5_PROG_SUMTYPE_NOSUPP; 2016 } 2017 *size = ct->checksumsize; 2018 return 0; 2019} 2020 2021krb5_boolean KRB5_LIB_FUNCTION 2022krb5_checksum_is_keyed(krb5_context context, 2023 krb5_cksumtype type) 2024{ 2025 struct checksum_type *ct = _find_checksum(type); 2026 if(ct == NULL) { 2027 if (context) 2028 krb5_set_error_string (context, "checksum type %d not supported", 2029 type); 2030 return KRB5_PROG_SUMTYPE_NOSUPP; 2031 } 2032 return ct->flags & F_KEYED; 2033} 2034 2035krb5_boolean KRB5_LIB_FUNCTION 2036krb5_checksum_is_collision_proof(krb5_context context, 2037 krb5_cksumtype type) 2038{ 2039 struct checksum_type *ct = _find_checksum(type); 2040 if(ct == NULL) { 2041 if (context) 2042 krb5_set_error_string (context, "checksum type %d not supported", 2043 type); 2044 return KRB5_PROG_SUMTYPE_NOSUPP; 2045 } 2046 return ct->flags & F_CPROOF; 2047} 2048 2049krb5_error_code KRB5_LIB_FUNCTION 2050krb5_checksum_disable(krb5_context context, 2051 krb5_cksumtype type) 2052{ 2053 struct checksum_type *ct = _find_checksum(type); 2054 if(ct == NULL) { 2055 if (context) 2056 krb5_set_error_string (context, "checksum type %d not supported", 2057 type); 2058 return KRB5_PROG_SUMTYPE_NOSUPP; 2059 } 2060 ct->flags |= F_DISABLED; 2061 return 0; 2062} 2063 2064/************************************************************ 2065 * * 2066 ************************************************************/ 2067 2068static krb5_error_code 2069NULL_encrypt(krb5_context context, 2070 struct key_data *key, 2071 void *data, 2072 size_t len, 2073 krb5_boolean encryptp, 2074 int usage, 2075 void *ivec) 2076{ 2077 return 0; 2078} 2079 2080static krb5_error_code 2081DES_CBC_encrypt_null_ivec(krb5_context context, 2082 struct key_data *key, 2083 void *data, 2084 size_t len, 2085 krb5_boolean encryptp, 2086 int usage, 2087 void *ignore_ivec) 2088{ 2089 DES_cblock ivec; 2090 DES_key_schedule *s = key->schedule->data; 2091 memset(&ivec, 0, sizeof(ivec)); 2092 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp); 2093 return 0; 2094} 2095 2096static krb5_error_code 2097DES_CBC_encrypt_key_ivec(krb5_context context, 2098 struct key_data *key, 2099 void *data, 2100 size_t len, 2101 krb5_boolean encryptp, 2102 int usage, 2103 void *ignore_ivec) 2104{ 2105 DES_cblock ivec; 2106 DES_key_schedule *s = key->schedule->data; 2107 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec)); 2108 DES_cbc_encrypt(data, data, len, s, &ivec, encryptp); 2109 return 0; 2110} 2111 2112static krb5_error_code 2113DES3_CBC_encrypt(krb5_context context, 2114 struct key_data *key, 2115 void *data, 2116 size_t len, 2117 krb5_boolean encryptp, 2118 int usage, 2119 void *ivec) 2120{ 2121 DES_cblock local_ivec; 2122 DES_key_schedule *s = key->schedule->data; 2123 if(ivec == NULL) { 2124 ivec = &local_ivec; 2125 memset(local_ivec, 0, sizeof(local_ivec)); 2126 } 2127 DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp); 2128 return 0; 2129} 2130 2131static krb5_error_code 2132DES_CFB64_encrypt_null_ivec(krb5_context context, 2133 struct key_data *key, 2134 void *data, 2135 size_t len, 2136 krb5_boolean encryptp, 2137 int usage, 2138 void *ignore_ivec) 2139{ 2140 DES_cblock ivec; 2141 int num = 0; 2142 DES_key_schedule *s = key->schedule->data; 2143 memset(&ivec, 0, sizeof(ivec)); 2144 2145 DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp); 2146 return 0; 2147} 2148 2149static krb5_error_code 2150DES_PCBC_encrypt_key_ivec(krb5_context context, 2151 struct key_data *key, 2152 void *data, 2153 size_t len, 2154 krb5_boolean encryptp, 2155 int usage, 2156 void *ignore_ivec) 2157{ 2158 DES_cblock ivec; 2159 DES_key_schedule *s = key->schedule->data; 2160 memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec)); 2161 2162 DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp); 2163 return 0; 2164} 2165 2166/* 2167 * AES draft-raeburn-krb-rijndael-krb-02 2168 */ 2169 2170void KRB5_LIB_FUNCTION 2171_krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out, 2172 size_t len, const AES_KEY *key, 2173 unsigned char *ivec, const int encryptp) 2174{ 2175 unsigned char tmp[AES_BLOCK_SIZE]; 2176 int i; 2177 2178 /* 2179 * In the framework of kerberos, the length can never be shorter 2180 * then at least one blocksize. 2181 */ 2182 2183 if (encryptp) { 2184 2185 while(len > AES_BLOCK_SIZE) { 2186 for (i = 0; i < AES_BLOCK_SIZE; i++) 2187 tmp[i] = in[i] ^ ivec[i]; 2188 AES_encrypt(tmp, out, key); 2189 memcpy(ivec, out, AES_BLOCK_SIZE); 2190 len -= AES_BLOCK_SIZE; 2191 in += AES_BLOCK_SIZE; 2192 out += AES_BLOCK_SIZE; 2193 } 2194 2195 for (i = 0; i < len; i++) 2196 tmp[i] = in[i] ^ ivec[i]; 2197 for (; i < AES_BLOCK_SIZE; i++) 2198 tmp[i] = 0 ^ ivec[i]; 2199 2200 AES_encrypt(tmp, out - AES_BLOCK_SIZE, key); 2201 2202 memcpy(out, ivec, len); 2203 memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE); 2204 2205 } else { 2206 unsigned char tmp2[AES_BLOCK_SIZE]; 2207 unsigned char tmp3[AES_BLOCK_SIZE]; 2208 2209 while(len > AES_BLOCK_SIZE * 2) { 2210 memcpy(tmp, in, AES_BLOCK_SIZE); 2211 AES_decrypt(in, out, key); 2212 for (i = 0; i < AES_BLOCK_SIZE; i++) 2213 out[i] ^= ivec[i]; 2214 memcpy(ivec, tmp, AES_BLOCK_SIZE); 2215 len -= AES_BLOCK_SIZE; 2216 in += AES_BLOCK_SIZE; 2217 out += AES_BLOCK_SIZE; 2218 } 2219 2220 len -= AES_BLOCK_SIZE; 2221 2222 memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */ 2223 AES_decrypt(in, tmp2, key); 2224 2225 memcpy(tmp3, in + AES_BLOCK_SIZE, len); 2226 memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */ 2227 2228 for (i = 0; i < len; i++) 2229 out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i]; 2230 2231 AES_decrypt(tmp3, out, key); 2232 for (i = 0; i < AES_BLOCK_SIZE; i++) 2233 out[i] ^= ivec[i]; 2234 memcpy(ivec, tmp, AES_BLOCK_SIZE); 2235 } 2236} 2237 2238static krb5_error_code 2239AES_CTS_encrypt(krb5_context context, 2240 struct key_data *key, 2241 void *data, 2242 size_t len, 2243 krb5_boolean encryptp, 2244 int usage, 2245 void *ivec) 2246{ 2247 struct krb5_aes_schedule *aeskey = key->schedule->data; 2248 char local_ivec[AES_BLOCK_SIZE]; 2249 AES_KEY *k; 2250 2251 if (encryptp) 2252 k = &aeskey->ekey; 2253 else 2254 k = &aeskey->dkey; 2255 2256 if (len < AES_BLOCK_SIZE) 2257 krb5_abortx(context, "invalid use of AES_CTS_encrypt"); 2258 if (len == AES_BLOCK_SIZE) { 2259 if (encryptp) 2260 AES_encrypt(data, data, k); 2261 else 2262 AES_decrypt(data, data, k); 2263 } else { 2264 if(ivec == NULL) { 2265 memset(local_ivec, 0, sizeof(local_ivec)); 2266 ivec = local_ivec; 2267 } 2268 _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp); 2269 } 2270 2271 return 0; 2272} 2273 2274/* 2275 * section 6 of draft-brezak-win2k-krb-rc4-hmac-03 2276 * 2277 * warning: not for small children 2278 */ 2279 2280static krb5_error_code 2281ARCFOUR_subencrypt(krb5_context context, 2282 struct key_data *key, 2283 void *data, 2284 size_t len, 2285 unsigned usage, 2286 void *ivec) 2287{ 2288 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); 2289 Checksum k1_c, k2_c, k3_c, cksum; 2290 struct key_data ke; 2291 krb5_keyblock kb; 2292 unsigned char t[4]; 2293 RC4_KEY rc4_key; 2294 unsigned char *cdata = data; 2295 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16]; 2296 krb5_error_code ret; 2297 2298 t[0] = (usage >> 0) & 0xFF; 2299 t[1] = (usage >> 8) & 0xFF; 2300 t[2] = (usage >> 16) & 0xFF; 2301 t[3] = (usage >> 24) & 0xFF; 2302 2303 k1_c.checksum.length = sizeof(k1_c_data); 2304 k1_c.checksum.data = k1_c_data; 2305 2306 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c); 2307 if (ret) 2308 krb5_abortx(context, "hmac failed"); 2309 2310 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data)); 2311 2312 k2_c.checksum.length = sizeof(k2_c_data); 2313 k2_c.checksum.data = k2_c_data; 2314 2315 ke.key = &kb; 2316 kb.keyvalue = k2_c.checksum; 2317 2318 cksum.checksum.length = 16; 2319 cksum.checksum.data = data; 2320 2321 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum); 2322 if (ret) 2323 krb5_abortx(context, "hmac failed"); 2324 2325 ke.key = &kb; 2326 kb.keyvalue = k1_c.checksum; 2327 2328 k3_c.checksum.length = sizeof(k3_c_data); 2329 k3_c.checksum.data = k3_c_data; 2330 2331 ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c); 2332 if (ret) 2333 krb5_abortx(context, "hmac failed"); 2334 2335 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data); 2336 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16); 2337 memset (k1_c_data, 0, sizeof(k1_c_data)); 2338 memset (k2_c_data, 0, sizeof(k2_c_data)); 2339 memset (k3_c_data, 0, sizeof(k3_c_data)); 2340 return 0; 2341} 2342 2343static krb5_error_code 2344ARCFOUR_subdecrypt(krb5_context context, 2345 struct key_data *key, 2346 void *data, 2347 size_t len, 2348 unsigned usage, 2349 void *ivec) 2350{ 2351 struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5); 2352 Checksum k1_c, k2_c, k3_c, cksum; 2353 struct key_data ke; 2354 krb5_keyblock kb; 2355 unsigned char t[4]; 2356 RC4_KEY rc4_key; 2357 unsigned char *cdata = data; 2358 unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16]; 2359 unsigned char cksum_data[16]; 2360 krb5_error_code ret; 2361 2362 t[0] = (usage >> 0) & 0xFF; 2363 t[1] = (usage >> 8) & 0xFF; 2364 t[2] = (usage >> 16) & 0xFF; 2365 t[3] = (usage >> 24) & 0xFF; 2366 2367 k1_c.checksum.length = sizeof(k1_c_data); 2368 k1_c.checksum.data = k1_c_data; 2369 2370 ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c); 2371 if (ret) 2372 krb5_abortx(context, "hmac failed"); 2373 2374 memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data)); 2375 2376 k2_c.checksum.length = sizeof(k2_c_data); 2377 k2_c.checksum.data = k2_c_data; 2378 2379 ke.key = &kb; 2380 kb.keyvalue = k1_c.checksum; 2381 2382 k3_c.checksum.length = sizeof(k3_c_data); 2383 k3_c.checksum.data = k3_c_data; 2384 2385 ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c); 2386 if (ret) 2387 krb5_abortx(context, "hmac failed"); 2388 2389 RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data); 2390 RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16); 2391 2392 ke.key = &kb; 2393 kb.keyvalue = k2_c.checksum; 2394 2395 cksum.checksum.length = 16; 2396 cksum.checksum.data = cksum_data; 2397 2398 ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum); 2399 if (ret) 2400 krb5_abortx(context, "hmac failed"); 2401 2402 memset (k1_c_data, 0, sizeof(k1_c_data)); 2403 memset (k2_c_data, 0, sizeof(k2_c_data)); 2404 memset (k3_c_data, 0, sizeof(k3_c_data)); 2405 2406 if (memcmp (cksum.checksum.data, data, 16) != 0) { 2407 krb5_clear_error_string (context); 2408 return KRB5KRB_AP_ERR_BAD_INTEGRITY; 2409 } else { 2410 return 0; 2411 } 2412} 2413 2414/* 2415 * convert the usage numbers used in 2416 * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in 2417 * draft-brezak-win2k-krb-rc4-hmac-04.txt 2418 */ 2419 2420static krb5_error_code 2421usage2arcfour (krb5_context context, unsigned *usage) 2422{ 2423 switch (*usage) { 2424 case KRB5_KU_AS_REP_ENC_PART : /* 3 */ 2425 case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */ 2426 *usage = 8; 2427 return 0; 2428 case KRB5_KU_USAGE_SEAL : /* 22 */ 2429 *usage = 13; 2430 return 0; 2431 case KRB5_KU_USAGE_SIGN : /* 23 */ 2432 *usage = 15; 2433 return 0; 2434 case KRB5_KU_USAGE_SEQ: /* 24 */ 2435 *usage = 0; 2436 return 0; 2437 default : 2438 return 0; 2439 } 2440} 2441 2442static krb5_error_code 2443ARCFOUR_encrypt(krb5_context context, 2444 struct key_data *key, 2445 void *data, 2446 size_t len, 2447 krb5_boolean encryptp, 2448 int usage, 2449 void *ivec) 2450{ 2451 krb5_error_code ret; 2452 unsigned keyusage = usage; 2453 2454 if((ret = usage2arcfour (context, &keyusage)) != 0) 2455 return ret; 2456 2457 if (encryptp) 2458 return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec); 2459 else 2460 return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec); 2461} 2462 2463 2464/* 2465 * 2466 */ 2467 2468static krb5_error_code 2469AES_PRF(krb5_context context, 2470 krb5_crypto crypto, 2471 const krb5_data *in, 2472 krb5_data *out) 2473{ 2474 struct checksum_type *ct = crypto->et->checksum; 2475 krb5_error_code ret; 2476 Checksum result; 2477 krb5_keyblock *derived; 2478 2479 result.cksumtype = ct->type; 2480 ret = krb5_data_alloc(&result.checksum, ct->checksumsize); 2481 if (ret) { 2482 krb5_set_error_string(context, "out memory"); 2483 return ret; 2484 } 2485 2486 (*ct->checksum)(context, NULL, in->data, in->length, 0, &result); 2487 2488 if (result.checksum.length < crypto->et->blocksize) 2489 krb5_abortx(context, "internal prf error"); 2490 2491 derived = NULL; 2492 ret = krb5_derive_key(context, crypto->key.key, 2493 crypto->et->type, "prf", 3, &derived); 2494 if (ret) 2495 krb5_abortx(context, "krb5_derive_key"); 2496 2497 ret = krb5_data_alloc(out, crypto->et->blocksize); 2498 if (ret) 2499 krb5_abortx(context, "malloc failed"); 2500 2501 { 2502 AES_KEY key; 2503 2504 AES_set_encrypt_key(derived->keyvalue.data, 2505 crypto->et->keytype->bits, &key); 2506 AES_encrypt(result.checksum.data, out->data, &key); 2507 memset(&key, 0, sizeof(key)); 2508 } 2509 2510 krb5_data_free(&result.checksum); 2511 krb5_free_keyblock(context, derived); 2512 2513 return ret; 2514} 2515 2516/* 2517 * these should currently be in reverse preference order. 2518 * (only relevant for !F_PSEUDO) */ 2519 2520static struct encryption_type enctype_null = { 2521 ETYPE_NULL, 2522 "null", 2523 NULL, 2524 1, 2525 1, 2526 0, 2527 &keytype_null, 2528 &checksum_none, 2529 NULL, 2530 F_DISABLED, 2531 NULL_encrypt, 2532 0, 2533 NULL 2534}; 2535static struct encryption_type enctype_des_cbc_crc = { 2536 ETYPE_DES_CBC_CRC, 2537 "des-cbc-crc", 2538 NULL, 2539 8, 2540 8, 2541 8, 2542 &keytype_des, 2543 &checksum_crc32, 2544 NULL, 2545 0, 2546 DES_CBC_encrypt_key_ivec, 2547 0, 2548 NULL 2549}; 2550static struct encryption_type enctype_des_cbc_md4 = { 2551 ETYPE_DES_CBC_MD4, 2552 "des-cbc-md4", 2553 NULL, 2554 8, 2555 8, 2556 8, 2557 &keytype_des, 2558 &checksum_rsa_md4, 2559 &checksum_rsa_md4_des, 2560 0, 2561 DES_CBC_encrypt_null_ivec, 2562 0, 2563 NULL 2564}; 2565static struct encryption_type enctype_des_cbc_md5 = { 2566 ETYPE_DES_CBC_MD5, 2567 "des-cbc-md5", 2568 NULL, 2569 8, 2570 8, 2571 8, 2572 &keytype_des, 2573 &checksum_rsa_md5, 2574 &checksum_rsa_md5_des, 2575 0, 2576 DES_CBC_encrypt_null_ivec, 2577 0, 2578 NULL 2579}; 2580static struct encryption_type enctype_arcfour_hmac_md5 = { 2581 ETYPE_ARCFOUR_HMAC_MD5, 2582 "arcfour-hmac-md5", 2583 NULL, 2584 1, 2585 1, 2586 8, 2587 &keytype_arcfour, 2588 &checksum_hmac_md5, 2589 NULL, 2590 F_SPECIAL, 2591 ARCFOUR_encrypt, 2592 0, 2593 NULL 2594}; 2595static struct encryption_type enctype_des3_cbc_md5 = { 2596 ETYPE_DES3_CBC_MD5, 2597 "des3-cbc-md5", 2598 NULL, 2599 8, 2600 8, 2601 8, 2602 &keytype_des3, 2603 &checksum_rsa_md5, 2604 &checksum_rsa_md5_des3, 2605 0, 2606 DES3_CBC_encrypt, 2607 0, 2608 NULL 2609}; 2610static struct encryption_type enctype_des3_cbc_sha1 = { 2611 ETYPE_DES3_CBC_SHA1, 2612 "des3-cbc-sha1", 2613 NULL, 2614 8, 2615 8, 2616 8, 2617 &keytype_des3_derived, 2618 &checksum_sha1, 2619 &checksum_hmac_sha1_des3, 2620 F_DERIVED, 2621 DES3_CBC_encrypt, 2622 0, 2623 NULL 2624}; 2625static struct encryption_type enctype_old_des3_cbc_sha1 = { 2626 ETYPE_OLD_DES3_CBC_SHA1, 2627 "old-des3-cbc-sha1", 2628 NULL, 2629 8, 2630 8, 2631 8, 2632 &keytype_des3, 2633 &checksum_sha1, 2634 &checksum_hmac_sha1_des3, 2635 0, 2636 DES3_CBC_encrypt, 2637 0, 2638 NULL 2639}; 2640static struct encryption_type enctype_aes128_cts_hmac_sha1 = { 2641 ETYPE_AES128_CTS_HMAC_SHA1_96, 2642 "aes128-cts-hmac-sha1-96", 2643 NULL, 2644 16, 2645 1, 2646 16, 2647 &keytype_aes128, 2648 &checksum_sha1, 2649 &checksum_hmac_sha1_aes128, 2650 F_DERIVED, 2651 AES_CTS_encrypt, 2652 16, 2653 AES_PRF 2654}; 2655static struct encryption_type enctype_aes256_cts_hmac_sha1 = { 2656 ETYPE_AES256_CTS_HMAC_SHA1_96, 2657 "aes256-cts-hmac-sha1-96", 2658 NULL, 2659 16, 2660 1, 2661 16, 2662 &keytype_aes256, 2663 &checksum_sha1, 2664 &checksum_hmac_sha1_aes256, 2665 F_DERIVED, 2666 AES_CTS_encrypt, 2667 16, 2668 AES_PRF 2669}; 2670static struct encryption_type enctype_des_cbc_none = { 2671 ETYPE_DES_CBC_NONE, 2672 "des-cbc-none", 2673 NULL, 2674 8, 2675 8, 2676 0, 2677 &keytype_des, 2678 &checksum_none, 2679 NULL, 2680 F_PSEUDO, 2681 DES_CBC_encrypt_null_ivec, 2682 0, 2683 NULL 2684}; 2685static struct encryption_type enctype_des_cfb64_none = { 2686 ETYPE_DES_CFB64_NONE, 2687 "des-cfb64-none", 2688 NULL, 2689 1, 2690 1, 2691 0, 2692 &keytype_des, 2693 &checksum_none, 2694 NULL, 2695 F_PSEUDO, 2696 DES_CFB64_encrypt_null_ivec, 2697 0, 2698 NULL 2699}; 2700static struct encryption_type enctype_des_pcbc_none = { 2701 ETYPE_DES_PCBC_NONE, 2702 "des-pcbc-none", 2703 NULL, 2704 8, 2705 8, 2706 0, 2707 &keytype_des, 2708 &checksum_none, 2709 NULL, 2710 F_PSEUDO, 2711 DES_PCBC_encrypt_key_ivec, 2712 0, 2713 NULL 2714}; 2715static struct encryption_type enctype_des3_cbc_none = { 2716 ETYPE_DES3_CBC_NONE, 2717 "des3-cbc-none", 2718 NULL, 2719 8, 2720 8, 2721 0, 2722 &keytype_des3_derived, 2723 &checksum_none, 2724 NULL, 2725 F_PSEUDO, 2726 DES3_CBC_encrypt, 2727 0, 2728 NULL 2729}; 2730 2731static struct encryption_type *etypes[] = { 2732 &enctype_null, 2733 &enctype_des_cbc_crc, 2734 &enctype_des_cbc_md4, 2735 &enctype_des_cbc_md5, 2736 &enctype_arcfour_hmac_md5, 2737 &enctype_des3_cbc_md5, 2738 &enctype_des3_cbc_sha1, 2739 &enctype_old_des3_cbc_sha1, 2740 &enctype_aes128_cts_hmac_sha1, 2741 &enctype_aes256_cts_hmac_sha1, 2742 &enctype_des_cbc_none, 2743 &enctype_des_cfb64_none, 2744 &enctype_des_pcbc_none, 2745 &enctype_des3_cbc_none 2746}; 2747 2748static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]); 2749 2750 2751static struct encryption_type * 2752_find_enctype(krb5_enctype type) 2753{ 2754 int i; 2755 for(i = 0; i < num_etypes; i++) 2756 if(etypes[i]->type == type) 2757 return etypes[i]; 2758 return NULL; 2759} 2760 2761 2762krb5_error_code KRB5_LIB_FUNCTION 2763krb5_enctype_to_string(krb5_context context, 2764 krb5_enctype etype, 2765 char **string) 2766{ 2767 struct encryption_type *e; 2768 e = _find_enctype(etype); 2769 if(e == NULL) { 2770 krb5_set_error_string (context, "encryption type %d not supported", 2771 etype); 2772 *string = NULL; 2773 return KRB5_PROG_ETYPE_NOSUPP; 2774 } 2775 *string = strdup(e->name); 2776 if(*string == NULL) { 2777 krb5_set_error_string(context, "malloc: out of memory"); 2778 return ENOMEM; 2779 } 2780 return 0; 2781} 2782 2783krb5_error_code KRB5_LIB_FUNCTION 2784krb5_string_to_enctype(krb5_context context, 2785 const char *string, 2786 krb5_enctype *etype) 2787{ 2788 int i; 2789 for(i = 0; i < num_etypes; i++) 2790 if(strcasecmp(etypes[i]->name, string) == 0){ 2791 *etype = etypes[i]->type; 2792 return 0; 2793 } 2794 krb5_set_error_string (context, "encryption type %s not supported", 2795 string); 2796 return KRB5_PROG_ETYPE_NOSUPP; 2797} 2798 2799krb5_error_code KRB5_LIB_FUNCTION 2800_krb5_enctype_to_oid(krb5_context context, 2801 krb5_enctype etype, 2802 heim_oid *oid) 2803{ 2804 struct encryption_type *et = _find_enctype(etype); 2805 if(et == NULL) { 2806 krb5_set_error_string (context, "encryption type %d not supported", 2807 etype); 2808 return KRB5_PROG_ETYPE_NOSUPP; 2809 } 2810 if(et->oid == NULL) { 2811 krb5_set_error_string (context, "%s have not oid", et->name); 2812 return KRB5_PROG_ETYPE_NOSUPP; 2813 } 2814 krb5_clear_error_string(context); 2815 return der_copy_oid(et->oid, oid); 2816} 2817 2818krb5_error_code KRB5_LIB_FUNCTION 2819_krb5_oid_to_enctype(krb5_context context, 2820 const heim_oid *oid, 2821 krb5_enctype *etype) 2822{ 2823 int i; 2824 for(i = 0; i < num_etypes; i++) { 2825 if(etypes[i]->oid && der_heim_oid_cmp(etypes[i]->oid, oid) == 0) { 2826 *etype = etypes[i]->type; 2827 return 0; 2828 } 2829 } 2830 krb5_set_error_string(context, "enctype for oid not supported"); 2831 return KRB5_PROG_ETYPE_NOSUPP; 2832} 2833 2834krb5_error_code KRB5_LIB_FUNCTION 2835krb5_enctype_to_keytype(krb5_context context, 2836 krb5_enctype etype, 2837 krb5_keytype *keytype) 2838{ 2839 struct encryption_type *e = _find_enctype(etype); 2840 if(e == NULL) { 2841 krb5_set_error_string (context, "encryption type %d not supported", 2842 etype); 2843 return KRB5_PROG_ETYPE_NOSUPP; 2844 } 2845 *keytype = e->keytype->type; /* XXX */ 2846 return 0; 2847} 2848 2849#if 0 2850krb5_error_code KRB5_LIB_FUNCTION 2851krb5_keytype_to_enctype(krb5_context context, 2852 krb5_keytype keytype, 2853 krb5_enctype *etype) 2854{ 2855 struct key_type *kt = _find_keytype(keytype); 2856 krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype); 2857 if(kt == NULL) 2858 return KRB5_PROG_KEYTYPE_NOSUPP; 2859 *etype = kt->best_etype; 2860 return 0; 2861} 2862#endif 2863 2864krb5_error_code KRB5_LIB_FUNCTION 2865krb5_keytype_to_enctypes (krb5_context context, 2866 krb5_keytype keytype, 2867 unsigned *len, 2868 krb5_enctype **val) 2869{ 2870 int i; 2871 unsigned n = 0; 2872 krb5_enctype *ret; 2873 2874 for (i = num_etypes - 1; i >= 0; --i) { 2875 if (etypes[i]->keytype->type == keytype 2876 && !(etypes[i]->flags & F_PSEUDO)) 2877 ++n; 2878 } 2879 ret = malloc(n * sizeof(*ret)); 2880 if (ret == NULL && n != 0) { 2881 krb5_set_error_string(context, "malloc: out of memory"); 2882 return ENOMEM; 2883 } 2884 n = 0; 2885 for (i = num_etypes - 1; i >= 0; --i) { 2886 if (etypes[i]->keytype->type == keytype 2887 && !(etypes[i]->flags & F_PSEUDO)) 2888 ret[n++] = etypes[i]->type; 2889 } 2890 *len = n; 2891 *val = ret; 2892 return 0; 2893} 2894 2895/* 2896 * First take the configured list of etypes for `keytype' if available, 2897 * else, do `krb5_keytype_to_enctypes'. 2898 */ 2899 2900krb5_error_code KRB5_LIB_FUNCTION 2901krb5_keytype_to_enctypes_default (krb5_context context, 2902 krb5_keytype keytype, 2903 unsigned *len, 2904 krb5_enctype **val) 2905{ 2906 int i, n; 2907 krb5_enctype *ret; 2908 2909 if (keytype != KEYTYPE_DES || context->etypes_des == NULL) 2910 return krb5_keytype_to_enctypes (context, keytype, len, val); 2911 2912 for (n = 0; context->etypes_des[n]; ++n) 2913 ; 2914 ret = malloc (n * sizeof(*ret)); 2915 if (ret == NULL && n != 0) { 2916 krb5_set_error_string(context, "malloc: out of memory"); 2917 return ENOMEM; 2918 } 2919 for (i = 0; i < n; ++i) 2920 ret[i] = context->etypes_des[i]; 2921 *len = n; 2922 *val = ret; 2923 return 0; 2924} 2925 2926krb5_error_code KRB5_LIB_FUNCTION 2927krb5_enctype_valid(krb5_context context, 2928 krb5_enctype etype) 2929{ 2930 struct encryption_type *e = _find_enctype(etype); 2931 if(e == NULL) { 2932 krb5_set_error_string (context, "encryption type %d not supported", 2933 etype); 2934 return KRB5_PROG_ETYPE_NOSUPP; 2935 } 2936 if (e->flags & F_DISABLED) { 2937 krb5_set_error_string (context, "encryption type %s is disabled", 2938 e->name); 2939 return KRB5_PROG_ETYPE_NOSUPP; 2940 } 2941 return 0; 2942} 2943 2944krb5_error_code KRB5_LIB_FUNCTION 2945krb5_cksumtype_valid(krb5_context context, 2946 krb5_cksumtype ctype) 2947{ 2948 struct checksum_type *c = _find_checksum(ctype); 2949 if (c == NULL) { 2950 krb5_set_error_string (context, "checksum type %d not supported", 2951 ctype); 2952 return KRB5_PROG_SUMTYPE_NOSUPP; 2953 } 2954 if (c->flags & F_DISABLED) { 2955 krb5_set_error_string (context, "checksum type %s is disabled", 2956 c->name); 2957 return KRB5_PROG_SUMTYPE_NOSUPP; 2958 } 2959 return 0; 2960} 2961 2962 2963/* if two enctypes have compatible keys */ 2964krb5_boolean KRB5_LIB_FUNCTION 2965krb5_enctypes_compatible_keys(krb5_context context, 2966 krb5_enctype etype1, 2967 krb5_enctype etype2) 2968{ 2969 struct encryption_type *e1 = _find_enctype(etype1); 2970 struct encryption_type *e2 = _find_enctype(etype2); 2971 return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype; 2972} 2973 2974static krb5_boolean 2975derived_crypto(krb5_context context, 2976 krb5_crypto crypto) 2977{ 2978 return (crypto->et->flags & F_DERIVED) != 0; 2979} 2980 2981static krb5_boolean 2982special_crypto(krb5_context context, 2983 krb5_crypto crypto) 2984{ 2985 return (crypto->et->flags & F_SPECIAL) != 0; 2986} 2987 2988#define CHECKSUMSIZE(C) ((C)->checksumsize) 2989#define CHECKSUMTYPE(C) ((C)->type) 2990 2991static krb5_error_code 2992encrypt_internal_derived(krb5_context context, 2993 krb5_crypto crypto, 2994 unsigned usage, 2995 const void *data, 2996 size_t len, 2997 krb5_data *result, 2998 void *ivec) 2999{ 3000 size_t sz, block_sz, checksum_sz, total_sz; 3001 Checksum cksum; 3002 unsigned char *p, *q; 3003 krb5_error_code ret; 3004 struct key_data *dkey; 3005 const struct encryption_type *et = crypto->et; 3006 3007 checksum_sz = CHECKSUMSIZE(et->keyed_checksum); 3008 3009 sz = et->confoundersize + len; 3010 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */ 3011 total_sz = block_sz + checksum_sz; 3012 p = calloc(1, total_sz); 3013 if(p == NULL) { 3014 krb5_set_error_string(context, "malloc: out of memory"); 3015 return ENOMEM; 3016 } 3017 3018 q = p; 3019 krb5_generate_random_block(q, et->confoundersize); /* XXX */ 3020 q += et->confoundersize; 3021 memcpy(q, data, len); 3022 3023 ret = create_checksum(context, 3024 et->keyed_checksum, 3025 crypto, 3026 INTEGRITY_USAGE(usage), 3027 p, 3028 block_sz, 3029 &cksum); 3030 if(ret == 0 && cksum.checksum.length != checksum_sz) { 3031 free_Checksum (&cksum); 3032 krb5_clear_error_string (context); 3033 ret = KRB5_CRYPTO_INTERNAL; 3034 } 3035 if(ret) 3036 goto fail; 3037 memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length); 3038 free_Checksum (&cksum); 3039 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey); 3040 if(ret) 3041 goto fail; 3042 ret = _key_schedule(context, dkey); 3043 if(ret) 3044 goto fail; 3045#ifdef CRYPTO_DEBUG 3046 krb5_crypto_debug(context, 1, block_sz, dkey->key); 3047#endif 3048 ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec); 3049 if (ret) 3050 goto fail; 3051 result->data = p; 3052 result->length = total_sz; 3053 return 0; 3054 fail: 3055 memset(p, 0, total_sz); 3056 free(p); 3057 return ret; 3058} 3059 3060 3061static krb5_error_code 3062encrypt_internal(krb5_context context, 3063 krb5_crypto crypto, 3064 const void *data, 3065 size_t len, 3066 krb5_data *result, 3067 void *ivec) 3068{ 3069 size_t sz, block_sz, checksum_sz; 3070 Checksum cksum; 3071 unsigned char *p, *q; 3072 krb5_error_code ret; 3073 const struct encryption_type *et = crypto->et; 3074 3075 checksum_sz = CHECKSUMSIZE(et->checksum); 3076 3077 sz = et->confoundersize + checksum_sz + len; 3078 block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */ 3079 p = calloc(1, block_sz); 3080 if(p == NULL) { 3081 krb5_set_error_string(context, "malloc: out of memory"); 3082 return ENOMEM; 3083 } 3084 3085 q = p; 3086 krb5_generate_random_block(q, et->confoundersize); /* XXX */ 3087 q += et->confoundersize; 3088 memset(q, 0, checksum_sz); 3089 q += checksum_sz; 3090 memcpy(q, data, len); 3091 3092 ret = create_checksum(context, 3093 et->checksum, 3094 crypto, 3095 0, 3096 p, 3097 block_sz, 3098 &cksum); 3099 if(ret == 0 && cksum.checksum.length != checksum_sz) { 3100 krb5_clear_error_string (context); 3101 free_Checksum(&cksum); 3102 ret = KRB5_CRYPTO_INTERNAL; 3103 } 3104 if(ret) 3105 goto fail; 3106 memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length); 3107 free_Checksum(&cksum); 3108 ret = _key_schedule(context, &crypto->key); 3109 if(ret) 3110 goto fail; 3111#ifdef CRYPTO_DEBUG 3112 krb5_crypto_debug(context, 1, block_sz, crypto->key.key); 3113#endif 3114 ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec); 3115 if (ret) { 3116 memset(p, 0, block_sz); 3117 free(p); 3118 return ret; 3119 } 3120 result->data = p; 3121 result->length = block_sz; 3122 return 0; 3123 fail: 3124 memset(p, 0, block_sz); 3125 free(p); 3126 return ret; 3127} 3128 3129static krb5_error_code 3130encrypt_internal_special(krb5_context context, 3131 krb5_crypto crypto, 3132 int usage, 3133 const void *data, 3134 size_t len, 3135 krb5_data *result, 3136 void *ivec) 3137{ 3138 struct encryption_type *et = crypto->et; 3139 size_t cksum_sz = CHECKSUMSIZE(et->checksum); 3140 size_t sz = len + cksum_sz + et->confoundersize; 3141 char *tmp, *p; 3142 krb5_error_code ret; 3143 3144 tmp = malloc (sz); 3145 if (tmp == NULL) { 3146 krb5_set_error_string(context, "malloc: out of memory"); 3147 return ENOMEM; 3148 } 3149 p = tmp; 3150 memset (p, 0, cksum_sz); 3151 p += cksum_sz; 3152 krb5_generate_random_block(p, et->confoundersize); 3153 p += et->confoundersize; 3154 memcpy (p, data, len); 3155 ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec); 3156 if (ret) { 3157 memset(tmp, 0, sz); 3158 free(tmp); 3159 return ret; 3160 } 3161 result->data = tmp; 3162 result->length = sz; 3163 return 0; 3164} 3165 3166static krb5_error_code 3167decrypt_internal_derived(krb5_context context, 3168 krb5_crypto crypto, 3169 unsigned usage, 3170 void *data, 3171 size_t len, 3172 krb5_data *result, 3173 void *ivec) 3174{ 3175 size_t checksum_sz; 3176 Checksum cksum; 3177 unsigned char *p; 3178 krb5_error_code ret; 3179 struct key_data *dkey; 3180 struct encryption_type *et = crypto->et; 3181 unsigned long l; 3182 3183 checksum_sz = CHECKSUMSIZE(et->keyed_checksum); 3184 if (len < checksum_sz + et->confoundersize) { 3185 krb5_set_error_string(context, "Encrypted data shorter then " 3186 "checksum + confunder"); 3187 return KRB5_BAD_MSIZE; 3188 } 3189 3190 if (((len - checksum_sz) % et->padsize) != 0) { 3191 krb5_clear_error_string(context); 3192 return KRB5_BAD_MSIZE; 3193 } 3194 3195 p = malloc(len); 3196 if(len != 0 && p == NULL) { 3197 krb5_set_error_string(context, "malloc: out of memory"); 3198 return ENOMEM; 3199 } 3200 memcpy(p, data, len); 3201 3202 len -= checksum_sz; 3203 3204 ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey); 3205 if(ret) { 3206 free(p); 3207 return ret; 3208 } 3209 ret = _key_schedule(context, dkey); 3210 if(ret) { 3211 free(p); 3212 return ret; 3213 } 3214#ifdef CRYPTO_DEBUG 3215 krb5_crypto_debug(context, 0, len, dkey->key); 3216#endif 3217 ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec); 3218 if (ret) { 3219 free(p); 3220 return ret; 3221 } 3222 3223 cksum.checksum.data = p + len; 3224 cksum.checksum.length = checksum_sz; 3225 cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum); 3226 3227 ret = verify_checksum(context, 3228 crypto, 3229 INTEGRITY_USAGE(usage), 3230 p, 3231 len, 3232 &cksum); 3233 if(ret) { 3234 free(p); 3235 return ret; 3236 } 3237 l = len - et->confoundersize; 3238 memmove(p, p + et->confoundersize, l); 3239 result->data = realloc(p, l); 3240 if(result->data == NULL && l != 0) { 3241 free(p); 3242 krb5_set_error_string(context, "malloc: out of memory"); 3243 return ENOMEM; 3244 } 3245 result->length = l; 3246 return 0; 3247} 3248 3249static krb5_error_code 3250decrypt_internal(krb5_context context, 3251 krb5_crypto crypto, 3252 void *data, 3253 size_t len, 3254 krb5_data *result, 3255 void *ivec) 3256{ 3257 krb5_error_code ret; 3258 unsigned char *p; 3259 Checksum cksum; 3260 size_t checksum_sz, l; 3261 struct encryption_type *et = crypto->et; 3262 3263 if ((len % et->padsize) != 0) { 3264 krb5_clear_error_string(context); 3265 return KRB5_BAD_MSIZE; 3266 } 3267 3268 checksum_sz = CHECKSUMSIZE(et->checksum); 3269 p = malloc(len); 3270 if(len != 0 && p == NULL) { 3271 krb5_set_error_string(context, "malloc: out of memory"); 3272 return ENOMEM; 3273 } 3274 memcpy(p, data, len); 3275 3276 ret = _key_schedule(context, &crypto->key); 3277 if(ret) { 3278 free(p); 3279 return ret; 3280 } 3281#ifdef CRYPTO_DEBUG 3282 krb5_crypto_debug(context, 0, len, crypto->key.key); 3283#endif 3284 ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec); 3285 if (ret) { 3286 free(p); 3287 return ret; 3288 } 3289 ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz); 3290 if(ret) { 3291 free(p); 3292 return ret; 3293 } 3294 memset(p + et->confoundersize, 0, checksum_sz); 3295 cksum.cksumtype = CHECKSUMTYPE(et->checksum); 3296 ret = verify_checksum(context, NULL, 0, p, len, &cksum); 3297 free_Checksum(&cksum); 3298 if(ret) { 3299 free(p); 3300 return ret; 3301 } 3302 l = len - et->confoundersize - checksum_sz; 3303 memmove(p, p + et->confoundersize + checksum_sz, l); 3304 result->data = realloc(p, l); 3305 if(result->data == NULL && l != 0) { 3306 free(p); 3307 krb5_set_error_string(context, "malloc: out of memory"); 3308 return ENOMEM; 3309 } 3310 result->length = l; 3311 return 0; 3312} 3313 3314static krb5_error_code 3315decrypt_internal_special(krb5_context context, 3316 krb5_crypto crypto, 3317 int usage, 3318 void *data, 3319 size_t len, 3320 krb5_data *result, 3321 void *ivec) 3322{ 3323 struct encryption_type *et = crypto->et; 3324 size_t cksum_sz = CHECKSUMSIZE(et->checksum); 3325 size_t sz = len - cksum_sz - et->confoundersize; 3326 unsigned char *p; 3327 krb5_error_code ret; 3328 3329 if ((len % et->padsize) != 0) { 3330 krb5_clear_error_string(context); 3331 return KRB5_BAD_MSIZE; 3332 } 3333 3334 p = malloc (len); 3335 if (p == NULL) { 3336 krb5_set_error_string(context, "malloc: out of memory"); 3337 return ENOMEM; 3338 } 3339 memcpy(p, data, len); 3340 3341 ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec); 3342 if (ret) { 3343 free(p); 3344 return ret; 3345 } 3346 3347 memmove (p, p + cksum_sz + et->confoundersize, sz); 3348 result->data = realloc(p, sz); 3349 if(result->data == NULL && sz != 0) { 3350 free(p); 3351 krb5_set_error_string(context, "malloc: out of memory"); 3352 return ENOMEM; 3353 } 3354 result->length = sz; 3355 return 0; 3356} 3357 3358 3359krb5_error_code KRB5_LIB_FUNCTION 3360krb5_encrypt_ivec(krb5_context context, 3361 krb5_crypto crypto, 3362 unsigned usage, 3363 const void *data, 3364 size_t len, 3365 krb5_data *result, 3366 void *ivec) 3367{ 3368 if(derived_crypto(context, crypto)) 3369 return encrypt_internal_derived(context, crypto, usage, 3370 data, len, result, ivec); 3371 else if (special_crypto(context, crypto)) 3372 return encrypt_internal_special (context, crypto, usage, 3373 data, len, result, ivec); 3374 else 3375 return encrypt_internal(context, crypto, data, len, result, ivec); 3376} 3377 3378krb5_error_code KRB5_LIB_FUNCTION 3379krb5_encrypt(krb5_context context, 3380 krb5_crypto crypto, 3381 unsigned usage, 3382 const void *data, 3383 size_t len, 3384 krb5_data *result) 3385{ 3386 return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL); 3387} 3388 3389krb5_error_code KRB5_LIB_FUNCTION 3390krb5_encrypt_EncryptedData(krb5_context context, 3391 krb5_crypto crypto, 3392 unsigned usage, 3393 void *data, 3394 size_t len, 3395 int kvno, 3396 EncryptedData *result) 3397{ 3398 result->etype = CRYPTO_ETYPE(crypto); 3399 if(kvno){ 3400 ALLOC(result->kvno, 1); 3401 *result->kvno = kvno; 3402 }else 3403 result->kvno = NULL; 3404 return krb5_encrypt(context, crypto, usage, data, len, &result->cipher); 3405} 3406 3407krb5_error_code KRB5_LIB_FUNCTION 3408krb5_decrypt_ivec(krb5_context context, 3409 krb5_crypto crypto, 3410 unsigned usage, 3411 void *data, 3412 size_t len, 3413 krb5_data *result, 3414 void *ivec) 3415{ 3416 if(derived_crypto(context, crypto)) 3417 return decrypt_internal_derived(context, crypto, usage, 3418 data, len, result, ivec); 3419 else if (special_crypto (context, crypto)) 3420 return decrypt_internal_special(context, crypto, usage, 3421 data, len, result, ivec); 3422 else 3423 return decrypt_internal(context, crypto, data, len, result, ivec); 3424} 3425 3426krb5_error_code KRB5_LIB_FUNCTION 3427krb5_decrypt(krb5_context context, 3428 krb5_crypto crypto, 3429 unsigned usage, 3430 void *data, 3431 size_t len, 3432 krb5_data *result) 3433{ 3434 return krb5_decrypt_ivec (context, crypto, usage, data, len, result, 3435 NULL); 3436} 3437 3438krb5_error_code KRB5_LIB_FUNCTION 3439krb5_decrypt_EncryptedData(krb5_context context, 3440 krb5_crypto crypto, 3441 unsigned usage, 3442 const EncryptedData *e, 3443 krb5_data *result) 3444{ 3445 return krb5_decrypt(context, crypto, usage, 3446 e->cipher.data, e->cipher.length, result); 3447} 3448 3449/************************************************************ 3450 * * 3451 ************************************************************/ 3452 3453#define ENTROPY_NEEDED 128 3454 3455static int 3456seed_something(void) 3457{ 3458 char buf[1024], seedfile[256]; 3459 3460 /* If there is a seed file, load it. But such a file cannot be trusted, 3461 so use 0 for the entropy estimate */ 3462 if (RAND_file_name(seedfile, sizeof(seedfile))) { 3463 int fd; 3464 fd = open(seedfile, O_RDONLY); 3465 if (fd >= 0) { 3466 ssize_t ret; 3467 ret = read(fd, buf, sizeof(buf)); 3468 if (ret > 0) 3469 RAND_add(buf, ret, 0.0); 3470 close(fd); 3471 } else 3472 seedfile[0] = '\0'; 3473 } else 3474 seedfile[0] = '\0'; 3475 3476 /* Calling RAND_status() will try to use /dev/urandom if it exists so 3477 we do not have to deal with it. */ 3478 if (RAND_status() != 1) { 3479 krb5_context context; 3480 const char *p; 3481 3482 /* Try using egd */ 3483 if (!krb5_init_context(&context)) { 3484 p = krb5_config_get_string(context, NULL, "libdefaults", 3485 "egd_socket", NULL); 3486 if (p != NULL) 3487 RAND_egd_bytes(p, ENTROPY_NEEDED); 3488 krb5_free_context(context); 3489 } 3490 } 3491 3492 if (RAND_status() == 1) { 3493 /* Update the seed file */ 3494 if (seedfile[0]) 3495 RAND_write_file(seedfile); 3496 3497 return 0; 3498 } else 3499 return -1; 3500} 3501 3502void KRB5_LIB_FUNCTION 3503krb5_generate_random_block(void *buf, size_t len) 3504{ 3505 static int rng_initialized = 0; 3506 3507 HEIMDAL_MUTEX_lock(&crypto_mutex); 3508 if (!rng_initialized) { 3509 if (seed_something()) 3510 krb5_abortx(NULL, "Fatal: could not seed the " 3511 "random number generator"); 3512 3513 rng_initialized = 1; 3514 } 3515 HEIMDAL_MUTEX_unlock(&crypto_mutex); 3516 if (RAND_bytes(buf, len) != 1) 3517 krb5_abortx(NULL, "Failed to generate random block"); 3518} 3519 3520static void 3521DES3_postproc(krb5_context context, 3522 unsigned char *k, size_t len, struct key_data *key) 3523{ 3524 DES3_random_to_key(context, key->key, k, len); 3525 3526 if (key->schedule) { 3527 krb5_free_data(context, key->schedule); 3528 key->schedule = NULL; 3529 } 3530} 3531 3532static krb5_error_code 3533derive_key(krb5_context context, 3534 struct encryption_type *et, 3535 struct key_data *key, 3536 const void *constant, 3537 size_t len) 3538{ 3539 unsigned char *k; 3540 unsigned int nblocks = 0, i; 3541 krb5_error_code ret = 0; 3542 struct key_type *kt = et->keytype; 3543 3544 ret = _key_schedule(context, key); 3545 if(ret) 3546 return ret; 3547 if(et->blocksize * 8 < kt->bits || len != et->blocksize) { 3548 nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8); 3549 k = malloc(nblocks * et->blocksize); 3550 if(k == NULL) { 3551 krb5_set_error_string(context, "malloc: out of memory"); 3552 return ENOMEM; 3553 } 3554 ret = _krb5_n_fold(constant, len, k, et->blocksize); 3555 if (ret) { 3556 free(k); 3557 krb5_set_error_string(context, "out of memory"); 3558 return ret; 3559 } 3560 for(i = 0; i < nblocks; i++) { 3561 if(i > 0) 3562 memcpy(k + i * et->blocksize, 3563 k + (i - 1) * et->blocksize, 3564 et->blocksize); 3565 (*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize, 3566 1, 0, NULL); 3567 } 3568 } else { 3569 /* this case is probably broken, but won't be run anyway */ 3570 void *c = malloc(len); 3571 size_t res_len = (kt->bits + 7) / 8; 3572 3573 if(len != 0 && c == NULL) { 3574 krb5_set_error_string(context, "malloc: out of memory"); 3575 return ENOMEM; 3576 } 3577 memcpy(c, constant, len); 3578 (*et->encrypt)(context, key, c, len, 1, 0, NULL); 3579 k = malloc(res_len); 3580 if(res_len != 0 && k == NULL) { 3581 free(c); 3582 krb5_set_error_string(context, "malloc: out of memory"); 3583 return ENOMEM; 3584 } 3585 ret = _krb5_n_fold(c, len, k, res_len); 3586 if (ret) { 3587 free(k); 3588 krb5_set_error_string(context, "out of memory"); 3589 return ret; 3590 } 3591 free(c); 3592 } 3593 3594 /* XXX keytype dependent post-processing */ 3595 switch(kt->type) { 3596 case KEYTYPE_DES3: 3597 DES3_postproc(context, k, nblocks * et->blocksize, key); 3598 break; 3599 case KEYTYPE_AES128: 3600 case KEYTYPE_AES256: 3601 memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length); 3602 break; 3603 default: 3604 krb5_set_error_string(context, 3605 "derive_key() called with unknown keytype (%u)", 3606 kt->type); 3607 ret = KRB5_CRYPTO_INTERNAL; 3608 break; 3609 } 3610 if (key->schedule) { 3611 krb5_free_data(context, key->schedule); 3612 key->schedule = NULL; 3613 } 3614 memset(k, 0, nblocks * et->blocksize); 3615 free(k); 3616 return ret; 3617} 3618 3619static struct key_data * 3620_new_derived_key(krb5_crypto crypto, unsigned usage) 3621{ 3622 struct key_usage *d = crypto->key_usage; 3623 d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d)); 3624 if(d == NULL) 3625 return NULL; 3626 crypto->key_usage = d; 3627 d += crypto->num_key_usage++; 3628 memset(d, 0, sizeof(*d)); 3629 d->usage = usage; 3630 return &d->key; 3631} 3632 3633krb5_error_code KRB5_LIB_FUNCTION 3634krb5_derive_key(krb5_context context, 3635 const krb5_keyblock *key, 3636 krb5_enctype etype, 3637 const void *constant, 3638 size_t constant_len, 3639 krb5_keyblock **derived_key) 3640{ 3641 krb5_error_code ret; 3642 struct encryption_type *et; 3643 struct key_data d; 3644 3645 *derived_key = NULL; 3646 3647 et = _find_enctype (etype); 3648 if (et == NULL) { 3649 krb5_set_error_string(context, "encryption type %d not supported", 3650 etype); 3651 return KRB5_PROG_ETYPE_NOSUPP; 3652 } 3653 3654 ret = krb5_copy_keyblock(context, key, &d.key); 3655 if (ret) 3656 return ret; 3657 3658 d.schedule = NULL; 3659 ret = derive_key(context, et, &d, constant, constant_len); 3660 if (ret == 0) 3661 ret = krb5_copy_keyblock(context, d.key, derived_key); 3662 free_key_data(context, &d); 3663 return ret; 3664} 3665 3666static krb5_error_code 3667_get_derived_key(krb5_context context, 3668 krb5_crypto crypto, 3669 unsigned usage, 3670 struct key_data **key) 3671{ 3672 int i; 3673 struct key_data *d; 3674 unsigned char constant[5]; 3675 3676 for(i = 0; i < crypto->num_key_usage; i++) 3677 if(crypto->key_usage[i].usage == usage) { 3678 *key = &crypto->key_usage[i].key; 3679 return 0; 3680 } 3681 d = _new_derived_key(crypto, usage); 3682 if(d == NULL) { 3683 krb5_set_error_string(context, "malloc: out of memory"); 3684 return ENOMEM; 3685 } 3686 krb5_copy_keyblock(context, crypto->key.key, &d->key); 3687 _krb5_put_int(constant, usage, 5); 3688 derive_key(context, crypto->et, d, constant, sizeof(constant)); 3689 *key = d; 3690 return 0; 3691} 3692 3693 3694krb5_error_code KRB5_LIB_FUNCTION 3695krb5_crypto_init(krb5_context context, 3696 const krb5_keyblock *key, 3697 krb5_enctype etype, 3698 krb5_crypto *crypto) 3699{ 3700 krb5_error_code ret; 3701 ALLOC(*crypto, 1); 3702 if(*crypto == NULL) { 3703 krb5_set_error_string(context, "malloc: out of memory"); 3704 return ENOMEM; 3705 } 3706 if(etype == ETYPE_NULL) 3707 etype = key->keytype; 3708 (*crypto)->et = _find_enctype(etype); 3709 if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) { 3710 free(*crypto); 3711 *crypto = NULL; 3712 krb5_set_error_string (context, "encryption type %d not supported", 3713 etype); 3714 return KRB5_PROG_ETYPE_NOSUPP; 3715 } 3716 if((*crypto)->et->keytype->size != key->keyvalue.length) { 3717 free(*crypto); 3718 *crypto = NULL; 3719 krb5_set_error_string (context, "encryption key has bad length"); 3720 return KRB5_BAD_KEYSIZE; 3721 } 3722 ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key); 3723 if(ret) { 3724 free(*crypto); 3725 *crypto = NULL; 3726 return ret; 3727 } 3728 (*crypto)->key.schedule = NULL; 3729 (*crypto)->num_key_usage = 0; 3730 (*crypto)->key_usage = NULL; 3731 return 0; 3732} 3733 3734static void 3735free_key_data(krb5_context context, struct key_data *key) 3736{ 3737 krb5_free_keyblock(context, key->key); 3738 if(key->schedule) { 3739 memset(key->schedule->data, 0, key->schedule->length); 3740 krb5_free_data(context, key->schedule); 3741 } 3742} 3743 3744static void 3745free_key_usage(krb5_context context, struct key_usage *ku) 3746{ 3747 free_key_data(context, &ku->key); 3748} 3749 3750krb5_error_code KRB5_LIB_FUNCTION 3751krb5_crypto_destroy(krb5_context context, 3752 krb5_crypto crypto) 3753{ 3754 int i; 3755 3756 for(i = 0; i < crypto->num_key_usage; i++) 3757 free_key_usage(context, &crypto->key_usage[i]); 3758 free(crypto->key_usage); 3759 free_key_data(context, &crypto->key); 3760 free (crypto); 3761 return 0; 3762} 3763 3764krb5_error_code KRB5_LIB_FUNCTION 3765krb5_crypto_getblocksize(krb5_context context, 3766 krb5_crypto crypto, 3767 size_t *blocksize) 3768{ 3769 *blocksize = crypto->et->blocksize; 3770 return 0; 3771} 3772 3773krb5_error_code KRB5_LIB_FUNCTION 3774krb5_crypto_getenctype(krb5_context context, 3775 krb5_crypto crypto, 3776 krb5_enctype *enctype) 3777{ 3778 *enctype = crypto->et->type; 3779 return 0; 3780} 3781 3782krb5_error_code KRB5_LIB_FUNCTION 3783krb5_crypto_getpadsize(krb5_context context, 3784 krb5_crypto crypto, 3785 size_t *padsize) 3786{ 3787 *padsize = crypto->et->padsize; 3788 return 0; 3789} 3790 3791krb5_error_code KRB5_LIB_FUNCTION 3792krb5_crypto_getconfoundersize(krb5_context context, 3793 krb5_crypto crypto, 3794 size_t *confoundersize) 3795{ 3796 *confoundersize = crypto->et->confoundersize; 3797 return 0; 3798} 3799 3800krb5_error_code KRB5_LIB_FUNCTION 3801krb5_enctype_disable(krb5_context context, 3802 krb5_enctype enctype) 3803{ 3804 struct encryption_type *et = _find_enctype(enctype); 3805 if(et == NULL) { 3806 if (context) 3807 krb5_set_error_string (context, "encryption type %d not supported", 3808 enctype); 3809 return KRB5_PROG_ETYPE_NOSUPP; 3810 } 3811 et->flags |= F_DISABLED; 3812 return 0; 3813} 3814 3815krb5_error_code KRB5_LIB_FUNCTION 3816krb5_string_to_key_derived(krb5_context context, 3817 const void *str, 3818 size_t len, 3819 krb5_enctype etype, 3820 krb5_keyblock *key) 3821{ 3822 struct encryption_type *et = _find_enctype(etype); 3823 krb5_error_code ret; 3824 struct key_data kd; 3825 size_t keylen; 3826 u_char *tmp; 3827 3828 if(et == NULL) { 3829 krb5_set_error_string (context, "encryption type %d not supported", 3830 etype); 3831 return KRB5_PROG_ETYPE_NOSUPP; 3832 } 3833 keylen = et->keytype->bits / 8; 3834 3835 ALLOC(kd.key, 1); 3836 if(kd.key == NULL) { 3837 krb5_set_error_string (context, "malloc: out of memory"); 3838 return ENOMEM; 3839 } 3840 ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size); 3841 if(ret) { 3842 free(kd.key); 3843 return ret; 3844 } 3845 kd.key->keytype = etype; 3846 tmp = malloc (keylen); 3847 if(tmp == NULL) { 3848 krb5_free_keyblock(context, kd.key); 3849 krb5_set_error_string (context, "malloc: out of memory"); 3850 return ENOMEM; 3851 } 3852 ret = _krb5_n_fold(str, len, tmp, keylen); 3853 if (ret) { 3854 free(tmp); 3855 krb5_set_error_string(context, "out of memory"); 3856 return ret; 3857 } 3858 kd.schedule = NULL; 3859 DES3_postproc (context, tmp, keylen, &kd); /* XXX */ 3860 memset(tmp, 0, keylen); 3861 free(tmp); 3862 ret = derive_key(context, 3863 et, 3864 &kd, 3865 "kerberos", /* XXX well known constant */ 3866 strlen("kerberos")); 3867 ret = krb5_copy_keyblock_contents(context, kd.key, key); 3868 free_key_data(context, &kd); 3869 return ret; 3870} 3871 3872static size_t 3873wrapped_length (krb5_context context, 3874 krb5_crypto crypto, 3875 size_t data_len) 3876{ 3877 struct encryption_type *et = crypto->et; 3878 size_t padsize = et->padsize; 3879 size_t checksumsize = CHECKSUMSIZE(et->checksum); 3880 size_t res; 3881 3882 res = et->confoundersize + checksumsize + data_len; 3883 res = (res + padsize - 1) / padsize * padsize; 3884 return res; 3885} 3886 3887static size_t 3888wrapped_length_dervied (krb5_context context, 3889 krb5_crypto crypto, 3890 size_t data_len) 3891{ 3892 struct encryption_type *et = crypto->et; 3893 size_t padsize = et->padsize; 3894 size_t res; 3895 3896 res = et->confoundersize + data_len; 3897 res = (res + padsize - 1) / padsize * padsize; 3898 if (et->keyed_checksum) 3899 res += et->keyed_checksum->checksumsize; 3900 else 3901 res += et->checksum->checksumsize; 3902 return res; 3903} 3904 3905/* 3906 * Return the size of an encrypted packet of length `data_len' 3907 */ 3908 3909size_t 3910krb5_get_wrapped_length (krb5_context context, 3911 krb5_crypto crypto, 3912 size_t data_len) 3913{ 3914 if (derived_crypto (context, crypto)) 3915 return wrapped_length_dervied (context, crypto, data_len); 3916 else 3917 return wrapped_length (context, crypto, data_len); 3918} 3919 3920/* 3921 * Return the size of an encrypted packet of length `data_len' 3922 */ 3923 3924static size_t 3925crypto_overhead (krb5_context context, 3926 krb5_crypto crypto) 3927{ 3928 struct encryption_type *et = crypto->et; 3929 size_t res; 3930 3931 res = CHECKSUMSIZE(et->checksum); 3932 res += et->confoundersize; 3933 if (et->padsize > 1) 3934 res += et->padsize; 3935 return res; 3936} 3937 3938static size_t 3939crypto_overhead_dervied (krb5_context context, 3940 krb5_crypto crypto) 3941{ 3942 struct encryption_type *et = crypto->et; 3943 size_t res; 3944 3945 if (et->keyed_checksum) 3946 res = CHECKSUMSIZE(et->keyed_checksum); 3947 else 3948 res = CHECKSUMSIZE(et->checksum); 3949 res += et->confoundersize; 3950 if (et->padsize > 1) 3951 res += et->padsize; 3952 return res; 3953} 3954 3955size_t 3956krb5_crypto_overhead (krb5_context context, krb5_crypto crypto) 3957{ 3958 if (derived_crypto (context, crypto)) 3959 return crypto_overhead_dervied (context, crypto); 3960 else 3961 return crypto_overhead (context, crypto); 3962} 3963 3964krb5_error_code KRB5_LIB_FUNCTION 3965krb5_random_to_key(krb5_context context, 3966 krb5_enctype type, 3967 const void *data, 3968 size_t size, 3969 krb5_keyblock *key) 3970{ 3971 krb5_error_code ret; 3972 struct encryption_type *et = _find_enctype(type); 3973 if(et == NULL) { 3974 krb5_set_error_string(context, "encryption type %d not supported", 3975 type); 3976 return KRB5_PROG_ETYPE_NOSUPP; 3977 } 3978 if ((et->keytype->bits + 7) / 8 > size) { 3979 krb5_set_error_string(context, "encryption key %s needs %d bytes " 3980 "of random to make an encryption key out of it", 3981 et->name, (int)et->keytype->size); 3982 return KRB5_PROG_ETYPE_NOSUPP; 3983 } 3984 ret = krb5_data_alloc(&key->keyvalue, et->keytype->size); 3985 if(ret) 3986 return ret; 3987 key->keytype = type; 3988 if (et->keytype->random_to_key) 3989 (*et->keytype->random_to_key)(context, key, data, size); 3990 else 3991 memcpy(key->keyvalue.data, data, et->keytype->size); 3992 3993 return 0; 3994} 3995 3996krb5_error_code 3997_krb5_pk_octetstring2key(krb5_context context, 3998 krb5_enctype type, 3999 const void *dhdata, 4000 size_t dhsize, 4001 const heim_octet_string *c_n, 4002 const heim_octet_string *k_n, 4003 krb5_keyblock *key) 4004{ 4005 struct encryption_type *et = _find_enctype(type); 4006 krb5_error_code ret; 4007 size_t keylen, offset; 4008 void *keydata; 4009 unsigned char counter; 4010 unsigned char shaoutput[20]; 4011 4012 if(et == NULL) { 4013 krb5_set_error_string(context, "encryption type %d not supported", 4014 type); 4015 return KRB5_PROG_ETYPE_NOSUPP; 4016 } 4017 keylen = (et->keytype->bits + 7) / 8; 4018 4019 keydata = malloc(keylen); 4020 if (keydata == NULL) { 4021 krb5_set_error_string(context, "malloc: out of memory"); 4022 return ENOMEM; 4023 } 4024 4025 counter = 0; 4026 offset = 0; 4027 do { 4028 SHA_CTX m; 4029 4030 SHA1_Init(&m); 4031 SHA1_Update(&m, &counter, 1); 4032 SHA1_Update(&m, dhdata, dhsize); 4033 if (c_n) 4034 SHA1_Update(&m, c_n->data, c_n->length); 4035 if (k_n) 4036 SHA1_Update(&m, k_n->data, k_n->length); 4037 SHA1_Final(shaoutput, &m); 4038 4039 memcpy((unsigned char *)keydata + offset, 4040 shaoutput, 4041 min(keylen - offset, sizeof(shaoutput))); 4042 4043 offset += sizeof(shaoutput); 4044 counter++; 4045 } while(offset < keylen); 4046 memset(shaoutput, 0, sizeof(shaoutput)); 4047 4048 ret = krb5_random_to_key(context, type, keydata, keylen, key); 4049 memset(keydata, 0, sizeof(keylen)); 4050 free(keydata); 4051 return ret; 4052} 4053 4054krb5_error_code KRB5_LIB_FUNCTION 4055krb5_crypto_prf_length(krb5_context context, 4056 krb5_enctype type, 4057 size_t *length) 4058{ 4059 struct encryption_type *et = _find_enctype(type); 4060 4061 if(et == NULL || et->prf_length == 0) { 4062 krb5_set_error_string(context, "encryption type %d not supported", 4063 type); 4064 return KRB5_PROG_ETYPE_NOSUPP; 4065 } 4066 4067 *length = et->prf_length; 4068 return 0; 4069} 4070 4071krb5_error_code KRB5_LIB_FUNCTION 4072krb5_crypto_prf(krb5_context context, 4073 const krb5_crypto crypto, 4074 const krb5_data *input, 4075 krb5_data *output) 4076{ 4077 struct encryption_type *et = crypto->et; 4078 4079 krb5_data_zero(output); 4080 4081 if(et->prf == NULL) { 4082 krb5_set_error_string(context, "kerberos prf for %s not supported", 4083 et->name); 4084 return KRB5_PROG_ETYPE_NOSUPP; 4085 } 4086 4087 return (*et->prf)(context, crypto, input, output); 4088} 4089 4090 4091 4092 4093#ifdef CRYPTO_DEBUG 4094 4095static krb5_error_code 4096krb5_get_keyid(krb5_context context, 4097 krb5_keyblock *key, 4098 uint32_t *keyid) 4099{ 4100 MD5_CTX md5; 4101 unsigned char tmp[16]; 4102 4103 MD5_Init (&md5); 4104 MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length); 4105 MD5_Final (tmp, &md5); 4106 *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15]; 4107 return 0; 4108} 4109 4110static void 4111krb5_crypto_debug(krb5_context context, 4112 int encryptp, 4113 size_t len, 4114 krb5_keyblock *key) 4115{ 4116 uint32_t keyid; 4117 char *kt; 4118 krb5_get_keyid(context, key, &keyid); 4119 krb5_enctype_to_string(context, key->keytype, &kt); 4120 krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)", 4121 encryptp ? "encrypting" : "decrypting", 4122 (unsigned long)len, 4123 keyid, 4124 kt); 4125 free(kt); 4126} 4127 4128#endif /* CRYPTO_DEBUG */ 4129 4130#if 0 4131int 4132main() 4133{ 4134#if 0 4135 int i; 4136 krb5_context context; 4137 krb5_crypto crypto; 4138 struct key_data *d; 4139 krb5_keyblock key; 4140 char constant[4]; 4141 unsigned usage = ENCRYPTION_USAGE(3); 4142 krb5_error_code ret; 4143 4144 ret = krb5_init_context(&context); 4145 if (ret) 4146 errx (1, "krb5_init_context failed: %d", ret); 4147 4148 key.keytype = ETYPE_NEW_DES3_CBC_SHA1; 4149 key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8" 4150 "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e" 4151 "\xc8\xdf\xab\x26\x86\x64\x15\x25"; 4152 key.keyvalue.length = 24; 4153 4154 krb5_crypto_init(context, &key, 0, &crypto); 4155 4156 d = _new_derived_key(crypto, usage); 4157 if(d == NULL) 4158 krb5_errx(context, 1, "_new_derived_key failed"); 4159 krb5_copy_keyblock(context, crypto->key.key, &d->key); 4160 _krb5_put_int(constant, usage, 4); 4161 derive_key(context, crypto->et, d, constant, sizeof(constant)); 4162 return 0; 4163#else 4164 int i; 4165 krb5_context context; 4166 krb5_crypto crypto; 4167 struct key_data *d; 4168 krb5_keyblock key; 4169 krb5_error_code ret; 4170 Checksum res; 4171 4172 char *data = "what do ya want for nothing?"; 4173 4174 ret = krb5_init_context(&context); 4175 if (ret) 4176 errx (1, "krb5_init_context failed: %d", ret); 4177 4178 key.keytype = ETYPE_NEW_DES3_CBC_SHA1; 4179 key.keyvalue.data = "Jefe"; 4180 /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b" 4181 "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */ 4182 key.keyvalue.length = 4; 4183 4184 d = ecalloc(1, sizeof(*d)); 4185 d->key = &key; 4186 res.checksum.length = 20; 4187 res.checksum.data = emalloc(res.checksum.length); 4188 SP_HMAC_SHA1_checksum(context, d, data, 28, &res); 4189 4190 return 0; 4191#endif 4192} 4193#endif 4194