1 /*- 2 * Copyright (c) 2001-2006, Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <netinet/sctp_os.h> 35 #include <netinet/sctp.h> 36 #include <netinet/sctp_header.h> 37 #include <netinet/sctp_pcb.h> 38 #include <netinet/sctp_var.h> 39 #include <netinet/sctputil.h> 40 #include <netinet/sctp_indata.h> 41 #include <netinet/sctp_output.h> 42 #include <netinet/sctp_auth.h> 43 44 #ifdef SCTP_DEBUG 45 extern uint32_t sctp_debug_on; 46 47 #define SCTP_AUTH_DEBUG (sctp_debug_on & SCTP_DEBUG_AUTH1) 48 #define SCTP_AUTH_DEBUG2 (sctp_debug_on & SCTP_DEBUG_AUTH2) 49 #endif /* SCTP_DEBUG */ 50 51 52 inline void 53 sctp_clear_chunklist(sctp_auth_chklist_t * chklist) 54 { 55 bzero(chklist, sizeof(*chklist)); 56 /* chklist->num_chunks = 0; */ 57 } 58 59 sctp_auth_chklist_t * 60 sctp_alloc_chunklist(void) 61 { 62 sctp_auth_chklist_t *chklist; 63 64 SCTP_MALLOC(chklist, sctp_auth_chklist_t *, sizeof(*chklist), 65 "AUTH chklist"); 66 if (chklist == NULL) { 67 #ifdef SCTP_DEBUG 68 if (sctp_debug_on & SCTP_AUTH_DEBUG) { 69 printf("sctp_alloc_chunklist: failed to get memory!\n"); 70 } 71 #endif /* SCTP_DEBUG */ 72 } else { 73 sctp_clear_chunklist(chklist); 74 } 75 return (chklist); 76 } 77 78 void 79 sctp_free_chunklist(sctp_auth_chklist_t * list) 80 { 81 if (list != NULL) 82 SCTP_FREE(list); 83 } 84 85 sctp_auth_chklist_t * 86 sctp_copy_chunklist(sctp_auth_chklist_t * list) 87 { 88 sctp_auth_chklist_t *new_list; 89 90 if (list == NULL) 91 return (NULL); 92 93 /* get a new list */ 94 new_list = sctp_alloc_chunklist(); 95 if (new_list == NULL) 96 return (NULL); 97 /* copy it */ 98 bcopy(list, new_list, sizeof(*new_list)); 99 100 return (new_list); 101 } 102 103 104 /* 105 * add a chunk to the required chunks list 106 */ 107 int 108 sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list) 109 { 110 if (list == NULL) 111 return (-1); 112 113 /* is chunk restricted? */ 114 if ((chunk == SCTP_INITIATION) || 115 (chunk == SCTP_INITIATION_ACK) || 116 (chunk == SCTP_SHUTDOWN_COMPLETE) || 117 (chunk == SCTP_AUTHENTICATION)) { 118 return (-1); 119 } 120 if (list->chunks[chunk] == 0) { 121 list->chunks[chunk] = 1; 122 list->num_chunks++; 123 #ifdef SCTP_DEBUG 124 if (SCTP_AUTH_DEBUG) 125 printf("SCTP: added chunk %u (0x%02x) to Auth list\n", 126 chunk, chunk); 127 #endif 128 } 129 return (0); 130 } 131 132 /* 133 * delete a chunk from the required chunks list 134 */ 135 int 136 sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list) 137 { 138 if (list == NULL) 139 return (-1); 140 141 /* is chunk restricted? */ 142 if ((chunk == SCTP_ASCONF) || 143 (chunk == SCTP_ASCONF_ACK)) { 144 return (-1); 145 } 146 if (list->chunks[chunk] == 1) { 147 list->chunks[chunk] = 0; 148 list->num_chunks--; 149 #ifdef SCTP_DEBUG 150 if (SCTP_AUTH_DEBUG) 151 printf("SCTP: deleted chunk %u (0x%02x) from Auth list\n", 152 chunk, chunk); 153 #endif 154 } 155 return (0); 156 } 157 158 inline int 159 sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list) 160 { 161 if (list == NULL) 162 return (0); 163 else 164 return (list->num_chunks); 165 } 166 167 /* 168 * set the default list of chunks requiring AUTH 169 */ 170 void 171 sctp_auth_set_default_chunks(sctp_auth_chklist_t * list) 172 { 173 sctp_auth_add_chunk(SCTP_ASCONF, list); 174 sctp_auth_add_chunk(SCTP_ASCONF_ACK, list); 175 } 176 177 /* 178 * return the current number and list of required chunks caller must 179 * guarantee ptr has space for up to 256 bytes 180 */ 181 int 182 sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr) 183 { 184 int i, count = 0; 185 186 if (list == NULL) 187 return (0); 188 189 for (i = 0; i < 256; i++) { 190 if (list->chunks[i] != 0) { 191 *ptr++ = i; 192 count++; 193 } 194 } 195 return (count); 196 } 197 198 int 199 sctp_pack_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr) 200 { 201 int i, size = 0; 202 203 if (list == NULL) 204 return (0); 205 206 if (list->num_chunks <= 32) { 207 /* just list them, one byte each */ 208 for (i = 0; i < 256; i++) { 209 if (list->chunks[i] != 0) { 210 *ptr++ = i; 211 size++; 212 } 213 } 214 } else { 215 int index, offset; 216 217 /* pack into a 32 byte bitfield */ 218 for (i = 0; i < 256; i++) { 219 if (list->chunks[i] != 0) { 220 index = i / 8; 221 offset = i % 8; 222 ptr[index] |= (1 << offset); 223 } 224 } 225 size = 32; 226 } 227 return (size); 228 } 229 230 int 231 sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks, 232 sctp_auth_chklist_t * list) 233 { 234 int i; 235 int size; 236 237 if (list == NULL) 238 return (0); 239 240 if (num_chunks <= 32) { 241 /* just pull them, one byte each */ 242 for (i = 0; i < num_chunks; i++) { 243 sctp_auth_add_chunk(*ptr++, list); 244 } 245 size = num_chunks; 246 } else { 247 int index, offset; 248 249 /* unpack from a 32 byte bitfield */ 250 for (index = 0; index < 32; index++) { 251 for (offset = 0; offset < 8; offset++) { 252 if (ptr[index] & (1 << offset)) { 253 sctp_auth_add_chunk((index * 8) + offset, list); 254 } 255 } 256 } 257 size = 32; 258 } 259 return (size); 260 } 261 262 263 /* 264 * allocate structure space for a key of length keylen 265 */ 266 sctp_key_t * 267 sctp_alloc_key(uint32_t keylen) 268 { 269 sctp_key_t *new_key; 270 271 SCTP_MALLOC(new_key, sctp_key_t *, sizeof(*new_key) + keylen, 272 "AUTH key"); 273 if (new_key == NULL) { 274 /* out of memory */ 275 return (NULL); 276 } 277 new_key->keylen = keylen; 278 return (new_key); 279 } 280 281 void 282 sctp_free_key(sctp_key_t * key) 283 { 284 if (key != NULL) 285 SCTP_FREE(key); 286 } 287 288 void 289 sctp_print_key(sctp_key_t * key, const char *str) 290 { 291 uint32_t i; 292 293 if (key == NULL) { 294 printf("%s: [Null key]\n", str); 295 return; 296 } 297 printf("%s: len %u, ", str, key->keylen); 298 if (key->keylen) { 299 for (i = 0; i < key->keylen; i++) 300 printf("%02x", key->key[i]); 301 printf("\n"); 302 } else { 303 printf("[Null key]\n"); 304 } 305 } 306 307 void 308 sctp_show_key(sctp_key_t * key, const char *str) 309 { 310 uint32_t i; 311 312 if (key == NULL) { 313 printf("%s: [Null key]\n", str); 314 return; 315 } 316 printf("%s: len %u, ", str, key->keylen); 317 if (key->keylen) { 318 for (i = 0; i < key->keylen; i++) 319 printf("%02x", key->key[i]); 320 printf("\n"); 321 } else { 322 printf("[Null key]\n"); 323 } 324 } 325 326 static inline uint32_t 327 sctp_get_keylen(sctp_key_t * key) 328 { 329 if (key != NULL) 330 return (key->keylen); 331 else 332 return (0); 333 } 334 335 /* 336 * generate a new random key of length 'keylen' 337 */ 338 sctp_key_t * 339 sctp_generate_random_key(uint32_t keylen) 340 { 341 sctp_key_t *new_key; 342 343 /* validate keylen */ 344 if (keylen > SCTP_AUTH_RANDOM_SIZE_MAX) 345 keylen = SCTP_AUTH_RANDOM_SIZE_MAX; 346 347 new_key = sctp_alloc_key(keylen); 348 if (new_key == NULL) { 349 /* out of memory */ 350 return (NULL); 351 } 352 SCTP_READ_RANDOM(new_key->key, keylen); 353 new_key->keylen = keylen; 354 return (new_key); 355 } 356 357 sctp_key_t * 358 sctp_set_key(uint8_t * key, uint32_t keylen) 359 { 360 sctp_key_t *new_key; 361 362 new_key = sctp_alloc_key(keylen); 363 if (new_key == NULL) { 364 /* out of memory */ 365 return (NULL); 366 } 367 bcopy(key, new_key->key, keylen); 368 return (new_key); 369 } 370 371 /* 372 * given two keys of variable size, compute which key is "larger/smaller" 373 * returns: 1 if key1 > key2 -1 if key1 < key2 0 if key1 = key2 374 */ 375 static int 376 sctp_compare_key(sctp_key_t * key1, sctp_key_t * key2) 377 { 378 uint32_t maxlen; 379 uint32_t i; 380 uint32_t key1len, key2len; 381 uint8_t *key_1, *key_2; 382 uint8_t temp[SCTP_AUTH_RANDOM_SIZE_MAX]; 383 384 /* sanity/length check */ 385 key1len = sctp_get_keylen(key1); 386 key2len = sctp_get_keylen(key2); 387 if ((key1len == 0) && (key2len == 0)) 388 return (0); 389 else if (key1len == 0) 390 return (-1); 391 else if (key2len == 0) 392 return (1); 393 394 if (key1len != key2len) { 395 if (key1len >= key2len) 396 maxlen = key1len; 397 else 398 maxlen = key2len; 399 bzero(temp, maxlen); 400 if (key1len < maxlen) { 401 /* prepend zeroes to key1 */ 402 bcopy(key1->key, temp + (maxlen - key1len), key1len); 403 key_1 = temp; 404 key_2 = key2->key; 405 } else { 406 /* prepend zeroes to key2 */ 407 bcopy(key2->key, temp + (maxlen - key2len), key2len); 408 key_1 = key1->key; 409 key_2 = temp; 410 } 411 } else { 412 maxlen = key1len; 413 key_1 = key1->key; 414 key_2 = key2->key; 415 } 416 417 for (i = 0; i < maxlen; i++) { 418 if (*key_1 > *key_2) 419 return (1); 420 else if (*key_1 < *key_2) 421 return (-1); 422 key_1++; 423 key_2++; 424 } 425 426 /* keys are equal value, so check lengths */ 427 if (key1len == key2len) 428 return (0); 429 else if (key1len < key2len) 430 return (-1); 431 else 432 return (1); 433 } 434 435 /* 436 * generate the concatenated keying material based on the two keys and the 437 * shared key (if available). draft-ietf-tsvwg-auth specifies the specific 438 * order for concatenation 439 */ 440 sctp_key_t * 441 sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2, sctp_key_t * shared) 442 { 443 uint32_t keylen; 444 sctp_key_t *new_key; 445 uint8_t *key_ptr; 446 447 keylen = sctp_get_keylen(key1) + sctp_get_keylen(key2) + 448 sctp_get_keylen(shared); 449 450 if (keylen > 0) { 451 /* get space for the new key */ 452 new_key = sctp_alloc_key(keylen); 453 if (new_key == NULL) { 454 /* out of memory */ 455 return (NULL); 456 } 457 new_key->keylen = keylen; 458 key_ptr = new_key->key; 459 } else { 460 /* all keys empty/null?! */ 461 return (NULL); 462 } 463 464 /* concatenate the keys */ 465 if (sctp_compare_key(key1, key2) <= 0) { 466 /* key is key1 + shared + key2 */ 467 if (sctp_get_keylen(key1)) { 468 bcopy(key1->key, key_ptr, key1->keylen); 469 key_ptr += key1->keylen; 470 } 471 if (sctp_get_keylen(shared)) { 472 bcopy(shared->key, key_ptr, shared->keylen); 473 key_ptr += shared->keylen; 474 } 475 if (sctp_get_keylen(key2)) { 476 bcopy(key2->key, key_ptr, key2->keylen); 477 key_ptr += key2->keylen; 478 } 479 } else { 480 /* key is key2 + shared + key1 */ 481 if (sctp_get_keylen(key2)) { 482 bcopy(key2->key, key_ptr, key2->keylen); 483 key_ptr += key2->keylen; 484 } 485 if (sctp_get_keylen(shared)) { 486 bcopy(shared->key, key_ptr, shared->keylen); 487 key_ptr += shared->keylen; 488 } 489 if (sctp_get_keylen(key1)) { 490 bcopy(key1->key, key_ptr, key1->keylen); 491 key_ptr += key1->keylen; 492 } 493 } 494 return (new_key); 495 } 496 497 498 sctp_sharedkey_t * 499 sctp_alloc_sharedkey(void) 500 { 501 sctp_sharedkey_t *new_key; 502 503 SCTP_MALLOC(new_key, sctp_sharedkey_t *, sizeof(*new_key), 504 "AUTH skey"); 505 if (new_key == NULL) { 506 /* out of memory */ 507 return (NULL); 508 } 509 new_key->keyid = 0; 510 new_key->key = NULL; 511 return (new_key); 512 } 513 514 void 515 sctp_free_sharedkey(sctp_sharedkey_t * skey) 516 { 517 if (skey != NULL) { 518 if (skey->key != NULL) 519 sctp_free_key(skey->key); 520 SCTP_FREE(skey); 521 } 522 } 523 524 sctp_sharedkey_t * 525 sctp_find_sharedkey(struct sctp_keyhead *shared_keys, uint16_t key_id) 526 { 527 sctp_sharedkey_t *skey; 528 529 LIST_FOREACH(skey, shared_keys, next) { 530 if (skey->keyid == key_id) 531 return (skey); 532 } 533 return (NULL); 534 } 535 536 void 537 sctp_insert_sharedkey(struct sctp_keyhead *shared_keys, 538 sctp_sharedkey_t * new_skey) 539 { 540 sctp_sharedkey_t *skey; 541 542 if ((shared_keys == NULL) || (new_skey == NULL)) 543 return; 544 545 /* insert into an empty list? */ 546 if (LIST_EMPTY(shared_keys)) { 547 LIST_INSERT_HEAD(shared_keys, new_skey, next); 548 return; 549 } 550 /* insert into the existing list, ordered by key id */ 551 LIST_FOREACH(skey, shared_keys, next) { 552 if (new_skey->keyid < skey->keyid) { 553 /* insert it before here */ 554 LIST_INSERT_BEFORE(skey, new_skey, next); 555 return; 556 } else if (new_skey->keyid == skey->keyid) { 557 /* replace the existing key */ 558 #ifdef SCTP_DEBUG 559 if (SCTP_AUTH_DEBUG) 560 printf("replacing shared key id %u\n", new_skey->keyid); 561 #endif 562 LIST_INSERT_BEFORE(skey, new_skey, next); 563 LIST_REMOVE(skey, next); 564 sctp_free_sharedkey(skey); 565 return; 566 } 567 if (LIST_NEXT(skey, next) == NULL) { 568 /* belongs at the end of the list */ 569 LIST_INSERT_AFTER(skey, new_skey, next); 570 return; 571 } 572 } 573 } 574 575 static sctp_sharedkey_t * 576 sctp_copy_sharedkey(const sctp_sharedkey_t * skey) 577 { 578 sctp_sharedkey_t *new_skey; 579 580 if (skey == NULL) 581 return (NULL); 582 new_skey = sctp_alloc_sharedkey(); 583 if (new_skey == NULL) 584 return (NULL); 585 if (skey->key != NULL) 586 new_skey->key = sctp_set_key(skey->key->key, skey->key->keylen); 587 else 588 new_skey->key = NULL; 589 new_skey->keyid = skey->keyid; 590 return (new_skey); 591 } 592 593 int 594 sctp_copy_skeylist(const struct sctp_keyhead *src, struct sctp_keyhead *dest) 595 { 596 sctp_sharedkey_t *skey, *new_skey; 597 int count = 0; 598 599 if ((src == NULL) || (dest == NULL)) 600 return (0); 601 LIST_FOREACH(skey, src, next) { 602 new_skey = sctp_copy_sharedkey(skey); 603 if (new_skey != NULL) { 604 sctp_insert_sharedkey(dest, new_skey); 605 count++; 606 } 607 } 608 return (count); 609 } 610 611 612 sctp_hmaclist_t * 613 sctp_alloc_hmaclist(uint8_t num_hmacs) 614 { 615 sctp_hmaclist_t *new_list; 616 int alloc_size; 617 618 alloc_size = sizeof(*new_list) + num_hmacs * sizeof(new_list->hmac[0]); 619 SCTP_MALLOC(new_list, sctp_hmaclist_t *, alloc_size, 620 "AUTH HMAC list"); 621 if (new_list == NULL) { 622 /* out of memory */ 623 return (NULL); 624 } 625 new_list->max_algo = num_hmacs; 626 new_list->num_algo = 0; 627 return (new_list); 628 } 629 630 void 631 sctp_free_hmaclist(sctp_hmaclist_t * list) 632 { 633 if (list != NULL) { 634 SCTP_FREE(list); 635 list = NULL; 636 } 637 } 638 639 int 640 sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id) 641 { 642 if (list == NULL) 643 return (-1); 644 if (list->num_algo == list->max_algo) { 645 #ifdef SCTP_DEBUG 646 if (SCTP_AUTH_DEBUG) 647 printf("SCTP: HMAC id list full, ignoring add %u\n", hmac_id); 648 #endif 649 return (-1); 650 } 651 if ((hmac_id != SCTP_AUTH_HMAC_ID_SHA1) && 652 #ifdef HAVE_SHA224 653 (hmac_id != SCTP_AUTH_HMAC_ID_SHA224) && 654 #endif 655 #ifdef HAVE_SHA2 656 (hmac_id != SCTP_AUTH_HMAC_ID_SHA256) && 657 (hmac_id != SCTP_AUTH_HMAC_ID_SHA384) && 658 (hmac_id != SCTP_AUTH_HMAC_ID_SHA512) && 659 #endif 660 (hmac_id != SCTP_AUTH_HMAC_ID_MD5)) { 661 return (-1); 662 } 663 #ifdef SCTP_DEBUG 664 if (SCTP_AUTH_DEBUG) 665 printf("SCTP: add HMAC id %u to list\n", hmac_id); 666 #endif 667 list->hmac[list->num_algo++] = hmac_id; 668 return (0); 669 } 670 671 sctp_hmaclist_t * 672 sctp_copy_hmaclist(sctp_hmaclist_t * list) 673 { 674 sctp_hmaclist_t *new_list; 675 int i; 676 677 if (list == NULL) 678 return (NULL); 679 /* get a new list */ 680 new_list = sctp_alloc_hmaclist(list->max_algo); 681 if (new_list == NULL) 682 return (NULL); 683 /* copy it */ 684 new_list->max_algo = list->max_algo; 685 new_list->num_algo = list->num_algo; 686 for (i = 0; i < list->num_algo; i++) 687 new_list->hmac[i] = list->hmac[i]; 688 return (new_list); 689 } 690 691 sctp_hmaclist_t * 692 sctp_default_supported_hmaclist(void) 693 { 694 sctp_hmaclist_t *new_list; 695 696 new_list = sctp_alloc_hmaclist(2); 697 if (new_list == NULL) 698 return (NULL); 699 sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA1); 700 sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA256); 701 return (new_list); 702 } 703 704 /* 705 * HMAC algos are listed in priority/preference order find the best HMAC id 706 * to use for the peer based on local support 707 */ 708 uint16_t 709 sctp_negotiate_hmacid(sctp_hmaclist_t * peer, sctp_hmaclist_t * local) 710 { 711 int i, j; 712 713 if ((local == NULL) || (peer == NULL)) 714 return (SCTP_AUTH_HMAC_ID_RSVD); 715 716 for (i = 0; i < peer->num_algo; i++) { 717 for (j = 0; j < local->num_algo; j++) { 718 if (peer->hmac[i] == local->hmac[j]) { 719 #ifndef SCTP_AUTH_DRAFT_04 720 /* "skip" MD5 as it's been deprecated */ 721 if (peer->hmac[i] == SCTP_AUTH_HMAC_ID_MD5) 722 continue; 723 #endif 724 725 /* found the "best" one */ 726 #ifdef SCTP_DEBUG 727 if (SCTP_AUTH_DEBUG) 728 printf("SCTP: negotiated peer HMAC id %u\n", peer->hmac[i]); 729 #endif 730 return (peer->hmac[i]); 731 } 732 } 733 } 734 /* didn't find one! */ 735 return (SCTP_AUTH_HMAC_ID_RSVD); 736 } 737 738 /* 739 * serialize the HMAC algo list and return space used caller must guarantee 740 * ptr has appropriate space 741 */ 742 int 743 sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr) 744 { 745 int i; 746 uint16_t hmac_id; 747 748 if (list == NULL) 749 return (0); 750 751 for (i = 0; i < list->num_algo; i++) { 752 hmac_id = htons(list->hmac[i]); 753 bcopy(&hmac_id, ptr, sizeof(hmac_id)); 754 ptr += sizeof(hmac_id); 755 } 756 return (list->num_algo * sizeof(hmac_id)); 757 } 758 759 int 760 sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs, uint32_t num_hmacs) 761 { 762 uint32_t i; 763 uint16_t hmac_id; 764 uint32_t sha1_supported = 0; 765 766 for (i = 0; i < num_hmacs; i++) { 767 hmac_id = ntohs(hmacs->hmac_ids[i]); 768 if (hmac_id == SCTP_AUTH_HMAC_ID_SHA1) 769 sha1_supported = 1; 770 } 771 /* all HMAC id's are supported */ 772 if (sha1_supported == 0) 773 return (-1); 774 else 775 return (0); 776 } 777 778 sctp_authinfo_t * 779 sctp_alloc_authinfo(void) 780 { 781 sctp_authinfo_t *new_authinfo; 782 783 SCTP_MALLOC(new_authinfo, sctp_authinfo_t *, sizeof(*new_authinfo), 784 "AUTH info"); 785 if (new_authinfo == NULL) { 786 /* out of memory */ 787 return (NULL); 788 } 789 bzero(&new_authinfo, sizeof(*new_authinfo)); 790 return (new_authinfo); 791 } 792 793 void 794 sctp_free_authinfo(sctp_authinfo_t * authinfo) 795 { 796 if (authinfo == NULL) 797 return; 798 799 if (authinfo->random != NULL) 800 sctp_free_key(authinfo->random); 801 if (authinfo->peer_random != NULL) 802 sctp_free_key(authinfo->peer_random); 803 if (authinfo->assoc_key != NULL) 804 sctp_free_key(authinfo->assoc_key); 805 if (authinfo->recv_key != NULL) 806 sctp_free_key(authinfo->recv_key); 807 808 /* We are NOT dynamically allocating authinfo's right now... */ 809 /* SCTP_FREE(authinfo); */ 810 } 811 812 813 inline uint32_t 814 sctp_get_auth_chunk_len(uint16_t hmac_algo) 815 { 816 int size; 817 818 size = sizeof(struct sctp_auth_chunk) + sctp_get_hmac_digest_len(hmac_algo); 819 return (SCTP_SIZE32(size)); 820 } 821 822 uint32_t 823 sctp_get_hmac_digest_len(uint16_t hmac_algo) 824 { 825 switch (hmac_algo) { 826 case SCTP_AUTH_HMAC_ID_SHA1: 827 return (SCTP_AUTH_DIGEST_LEN_SHA1); 828 case SCTP_AUTH_HMAC_ID_MD5: 829 return (SCTP_AUTH_DIGEST_LEN_MD5); 830 #ifdef HAVE_SHA224 831 case SCTP_AUTH_HMAC_ID_SHA224: 832 return (SCTP_AUTH_DIGEST_LEN_SHA224); 833 #endif 834 #ifdef HAVE_SHA2 835 case SCTP_AUTH_HMAC_ID_SHA256: 836 return (SCTP_AUTH_DIGEST_LEN_SHA256); 837 case SCTP_AUTH_HMAC_ID_SHA384: 838 return (SCTP_AUTH_DIGEST_LEN_SHA384); 839 case SCTP_AUTH_HMAC_ID_SHA512: 840 return (SCTP_AUTH_DIGEST_LEN_SHA512); 841 #endif 842 default: 843 /* unknown HMAC algorithm: can't do anything */ 844 return (0); 845 } /* end switch */ 846 } 847 848 static inline int 849 sctp_get_hmac_block_len(uint16_t hmac_algo) 850 { 851 switch (hmac_algo) { 852 case SCTP_AUTH_HMAC_ID_SHA1: 853 case SCTP_AUTH_HMAC_ID_MD5: 854 #ifdef HAVE_SHA224 855 case SCTP_AUTH_HMAC_ID_SHA224: 856 return (64); 857 #endif 858 #ifdef HAVE_SHA2 859 case SCTP_AUTH_HMAC_ID_SHA256: 860 return (64); 861 case SCTP_AUTH_HMAC_ID_SHA384: 862 case SCTP_AUTH_HMAC_ID_SHA512: 863 return (128); 864 #endif 865 case SCTP_AUTH_HMAC_ID_RSVD: 866 default: 867 /* unknown HMAC algorithm: can't do anything */ 868 return (0); 869 } /* end switch */ 870 } 871 872 static void 873 sctp_hmac_init(uint16_t hmac_algo, sctp_hash_context_t * ctx) 874 { 875 switch (hmac_algo) { 876 case SCTP_AUTH_HMAC_ID_SHA1: 877 SHA1_Init(&ctx->sha1); 878 break; 879 case SCTP_AUTH_HMAC_ID_MD5: 880 MD5_Init(&ctx->md5); 881 break; 882 #ifdef HAVE_SHA224 883 case SCTP_AUTH_HMAC_ID_SHA224: 884 break; 885 #endif 886 #ifdef HAVE_SHA2 887 case SCTP_AUTH_HMAC_ID_SHA256: 888 SHA256_Init(&ctx->sha256); 889 break; 890 case SCTP_AUTH_HMAC_ID_SHA384: 891 SHA384_Init(&ctx->sha384); 892 break; 893 case SCTP_AUTH_HMAC_ID_SHA512: 894 SHA512_Init(&ctx->sha512); 895 break; 896 #endif 897 case SCTP_AUTH_HMAC_ID_RSVD: 898 default: 899 /* unknown HMAC algorithm: can't do anything */ 900 return; 901 } /* end switch */ 902 } 903 904 static void 905 sctp_hmac_update(uint16_t hmac_algo, sctp_hash_context_t * ctx, 906 const uint8_t * text, uint32_t textlen) 907 { 908 switch (hmac_algo) { 909 case SCTP_AUTH_HMAC_ID_SHA1: 910 SHA1_Update(&ctx->sha1, text, textlen); 911 break; 912 case SCTP_AUTH_HMAC_ID_MD5: 913 MD5_Update(&ctx->md5, text, textlen); 914 break; 915 #ifdef HAVE_SHA224 916 case SCTP_AUTH_HMAC_ID_SHA224: 917 break; 918 #endif 919 #ifdef HAVE_SHA2 920 case SCTP_AUTH_HMAC_ID_SHA256: 921 SHA256_Update(&ctx->sha256, text, textlen); 922 break; 923 case SCTP_AUTH_HMAC_ID_SHA384: 924 SHA384_Update(&ctx->sha384, text, textlen); 925 break; 926 case SCTP_AUTH_HMAC_ID_SHA512: 927 SHA512_Update(&ctx->sha512, text, textlen); 928 break; 929 #endif 930 case SCTP_AUTH_HMAC_ID_RSVD: 931 default: 932 /* unknown HMAC algorithm: can't do anything */ 933 return; 934 } /* end switch */ 935 } 936 937 static void 938 sctp_hmac_final(uint16_t hmac_algo, sctp_hash_context_t * ctx, 939 uint8_t * digest) 940 { 941 switch (hmac_algo) { 942 case SCTP_AUTH_HMAC_ID_SHA1: 943 SHA1_Final(digest, &ctx->sha1); 944 break; 945 case SCTP_AUTH_HMAC_ID_MD5: 946 MD5_Final(digest, &ctx->md5); 947 break; 948 #ifdef HAVE_SHA224 949 case SCTP_AUTH_HMAC_ID_SHA224: 950 break; 951 #endif 952 #ifdef HAVE_SHA2 953 case SCTP_AUTH_HMAC_ID_SHA256: 954 SHA256_Final(digest, &ctx->sha256); 955 break; 956 case SCTP_AUTH_HMAC_ID_SHA384: 957 /* SHA384 is truncated SHA512 */ 958 SHA384_Final(digest, &ctx->sha384); 959 break; 960 case SCTP_AUTH_HMAC_ID_SHA512: 961 SHA512_Final(digest, &ctx->sha512); 962 break; 963 #endif 964 case SCTP_AUTH_HMAC_ID_RSVD: 965 default: 966 /* unknown HMAC algorithm: can't do anything */ 967 return; 968 } /* end switch */ 969 } 970 971 /* 972 * Keyed-Hashing for Message Authentication: FIPS 198 (RFC 2104) 973 * 974 * Compute the HMAC digest using the desired hash key, text, and HMAC 975 * algorithm. Resulting digest is placed in 'digest' and digest length 976 * is returned, if the HMAC was performed. 977 * 978 * WARNING: it is up to the caller to supply sufficient space to hold the 979 * resultant digest. 980 */ 981 uint32_t 982 sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 983 const uint8_t * text, uint32_t textlen, uint8_t * digest) 984 { 985 uint32_t digestlen; 986 uint32_t blocklen; 987 sctp_hash_context_t ctx; 988 uint8_t ipad[128], opad[128]; /* keyed hash inner/outer pads */ 989 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 990 uint32_t i; 991 992 /* sanity check the material and length */ 993 if ((key == NULL) || (keylen == 0) || (text == NULL) || 994 (textlen == 0) || (digest == NULL)) { 995 /* can't do HMAC with empty key or text or digest store */ 996 return (0); 997 } 998 /* validate the hmac algo and get the digest length */ 999 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1000 if (digestlen == 0) 1001 return (0); 1002 1003 /* hash the key if it is longer than the hash block size */ 1004 blocklen = sctp_get_hmac_block_len(hmac_algo); 1005 if (keylen > blocklen) { 1006 sctp_hmac_init(hmac_algo, &ctx); 1007 sctp_hmac_update(hmac_algo, &ctx, key, keylen); 1008 sctp_hmac_final(hmac_algo, &ctx, temp); 1009 /* set the hashed key as the key */ 1010 keylen = digestlen; 1011 key = temp; 1012 } 1013 /* initialize the inner/outer pads with the key and "append" zeroes */ 1014 bzero(ipad, blocklen); 1015 bzero(opad, blocklen); 1016 bcopy(key, ipad, keylen); 1017 bcopy(key, opad, keylen); 1018 1019 /* XOR the key with ipad and opad values */ 1020 for (i = 0; i < blocklen; i++) { 1021 ipad[i] ^= 0x36; 1022 opad[i] ^= 0x5c; 1023 } 1024 1025 /* perform inner hash */ 1026 sctp_hmac_init(hmac_algo, &ctx); 1027 sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen); 1028 sctp_hmac_update(hmac_algo, &ctx, text, textlen); 1029 sctp_hmac_final(hmac_algo, &ctx, temp); 1030 1031 /* perform outer hash */ 1032 sctp_hmac_init(hmac_algo, &ctx); 1033 sctp_hmac_update(hmac_algo, &ctx, opad, blocklen); 1034 sctp_hmac_update(hmac_algo, &ctx, temp, digestlen); 1035 sctp_hmac_final(hmac_algo, &ctx, digest); 1036 1037 return (digestlen); 1038 } 1039 1040 /* mbuf version */ 1041 uint32_t 1042 sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 1043 struct mbuf *m, uint32_t m_offset, uint8_t * digest) 1044 { 1045 uint32_t digestlen; 1046 uint32_t blocklen; 1047 sctp_hash_context_t ctx; 1048 uint8_t ipad[128], opad[128]; /* keyed hash inner/outer pads */ 1049 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1050 uint32_t i; 1051 struct mbuf *m_tmp; 1052 1053 /* sanity check the material and length */ 1054 if ((key == NULL) || (keylen == 0) || (m == NULL) || (digest == NULL)) { 1055 /* can't do HMAC with empty key or text or digest store */ 1056 return (0); 1057 } 1058 /* validate the hmac algo and get the digest length */ 1059 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1060 if (digestlen == 0) 1061 return (0); 1062 1063 /* hash the key if it is longer than the hash block size */ 1064 blocklen = sctp_get_hmac_block_len(hmac_algo); 1065 if (keylen > blocklen) { 1066 sctp_hmac_init(hmac_algo, &ctx); 1067 sctp_hmac_update(hmac_algo, &ctx, key, keylen); 1068 sctp_hmac_final(hmac_algo, &ctx, temp); 1069 /* set the hashed key as the key */ 1070 keylen = digestlen; 1071 key = temp; 1072 } 1073 /* initialize the inner/outer pads with the key and "append" zeroes */ 1074 bzero(ipad, blocklen); 1075 bzero(opad, blocklen); 1076 bcopy(key, ipad, keylen); 1077 bcopy(key, opad, keylen); 1078 1079 /* XOR the key with ipad and opad values */ 1080 for (i = 0; i < blocklen; i++) { 1081 ipad[i] ^= 0x36; 1082 opad[i] ^= 0x5c; 1083 } 1084 1085 /* perform inner hash */ 1086 sctp_hmac_init(hmac_algo, &ctx); 1087 sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen); 1088 /* find the correct starting mbuf and offset (get start of text) */ 1089 m_tmp = m; 1090 while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) { 1091 m_offset -= SCTP_BUF_LEN(m_tmp); 1092 m_tmp = SCTP_BUF_NEXT(m_tmp); 1093 } 1094 /* now use the rest of the mbuf chain for the text */ 1095 while (m_tmp != NULL) { 1096 sctp_hmac_update(hmac_algo, &ctx, mtod(m_tmp, uint8_t *) + m_offset, 1097 SCTP_BUF_LEN(m_tmp) - m_offset); 1098 1099 /* clear the offset since it's only for the first mbuf */ 1100 m_offset = 0; 1101 m_tmp = SCTP_BUF_NEXT(m_tmp); 1102 } 1103 sctp_hmac_final(hmac_algo, &ctx, temp); 1104 1105 /* perform outer hash */ 1106 sctp_hmac_init(hmac_algo, &ctx); 1107 sctp_hmac_update(hmac_algo, &ctx, opad, blocklen); 1108 sctp_hmac_update(hmac_algo, &ctx, temp, digestlen); 1109 sctp_hmac_final(hmac_algo, &ctx, digest); 1110 1111 return (digestlen); 1112 } 1113 1114 /* 1115 * verify the HMAC digest using the desired hash key, text, and HMAC 1116 * algorithm. Returns -1 on error, 0 on success. 1117 */ 1118 int 1119 sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 1120 const uint8_t * text, uint32_t textlen, 1121 uint8_t * digest, uint32_t digestlen) 1122 { 1123 uint32_t len; 1124 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1125 1126 /* sanity check the material and length */ 1127 if ((key == NULL) || (keylen == 0) || 1128 (text == NULL) || (textlen == 0) || (digest == NULL)) { 1129 /* can't do HMAC with empty key or text or digest */ 1130 return (-1); 1131 } 1132 len = sctp_get_hmac_digest_len(hmac_algo); 1133 if ((len == 0) || (digestlen != len)) 1134 return (-1); 1135 1136 /* compute the expected hash */ 1137 if (sctp_hmac(hmac_algo, key, keylen, text, textlen, temp) != len) 1138 return (-1); 1139 1140 if (memcmp(digest, temp, digestlen) != 0) 1141 return (-1); 1142 else 1143 return (0); 1144 } 1145 1146 1147 /* 1148 * computes the requested HMAC using a key struct (which may be modified if 1149 * the keylen exceeds the HMAC block len). 1150 */ 1151 uint32_t 1152 sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key, const uint8_t * text, 1153 uint32_t textlen, uint8_t * digest) 1154 { 1155 uint32_t digestlen; 1156 uint32_t blocklen; 1157 sctp_hash_context_t ctx; 1158 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1159 1160 /* sanity check */ 1161 if ((key == NULL) || (text == NULL) || (textlen == 0) || 1162 (digest == NULL)) { 1163 /* can't do HMAC with empty key or text or digest store */ 1164 return (0); 1165 } 1166 /* validate the hmac algo and get the digest length */ 1167 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1168 if (digestlen == 0) 1169 return (0); 1170 1171 /* hash the key if it is longer than the hash block size */ 1172 blocklen = sctp_get_hmac_block_len(hmac_algo); 1173 if (key->keylen > blocklen) { 1174 sctp_hmac_init(hmac_algo, &ctx); 1175 sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen); 1176 sctp_hmac_final(hmac_algo, &ctx, temp); 1177 /* save the hashed key as the new key */ 1178 key->keylen = digestlen; 1179 bcopy(temp, key->key, key->keylen); 1180 } 1181 return (sctp_hmac(hmac_algo, key->key, key->keylen, text, textlen, 1182 digest)); 1183 } 1184 1185 /* mbuf version */ 1186 uint32_t 1187 sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key, struct mbuf *m, 1188 uint32_t m_offset, uint8_t * digest) 1189 { 1190 uint32_t digestlen; 1191 uint32_t blocklen; 1192 sctp_hash_context_t ctx; 1193 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1194 1195 /* sanity check */ 1196 if ((key == NULL) || (m == NULL) || (digest == NULL)) { 1197 /* can't do HMAC with empty key or text or digest store */ 1198 return (0); 1199 } 1200 /* validate the hmac algo and get the digest length */ 1201 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1202 if (digestlen == 0) 1203 return (0); 1204 1205 /* hash the key if it is longer than the hash block size */ 1206 blocklen = sctp_get_hmac_block_len(hmac_algo); 1207 if (key->keylen > blocklen) { 1208 sctp_hmac_init(hmac_algo, &ctx); 1209 sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen); 1210 sctp_hmac_final(hmac_algo, &ctx, temp); 1211 /* save the hashed key as the new key */ 1212 key->keylen = digestlen; 1213 bcopy(temp, key->key, key->keylen); 1214 } 1215 return (sctp_hmac_m(hmac_algo, key->key, key->keylen, m, m_offset, digest)); 1216 } 1217 1218 int 1219 sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id) 1220 { 1221 int i; 1222 1223 if ((list == NULL) || (id == SCTP_AUTH_HMAC_ID_RSVD)) 1224 return (0); 1225 1226 for (i = 0; i < list->num_algo; i++) 1227 if (list->hmac[i] == id) 1228 return (1); 1229 1230 /* not in the list */ 1231 return (0); 1232 } 1233 1234 1235 /* 1236 * clear any cached key(s) if they match the given key id on an association 1237 * the cached key(s) will be recomputed and re-cached at next use. ASSUMES 1238 * TCB_LOCK is already held 1239 */ 1240 void 1241 sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid) 1242 { 1243 if (stcb == NULL) 1244 return; 1245 1246 if (keyid == stcb->asoc.authinfo.assoc_keyid) { 1247 sctp_free_key(stcb->asoc.authinfo.assoc_key); 1248 stcb->asoc.authinfo.assoc_key = NULL; 1249 } 1250 if (keyid == stcb->asoc.authinfo.recv_keyid) { 1251 sctp_free_key(stcb->asoc.authinfo.recv_key); 1252 stcb->asoc.authinfo.recv_key = NULL; 1253 } 1254 } 1255 1256 /* 1257 * clear any cached key(s) if they match the given key id for all assocs on 1258 * an association ASSUMES INP_WLOCK is already held 1259 */ 1260 void 1261 sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid) 1262 { 1263 struct sctp_tcb *stcb; 1264 1265 if (inp == NULL) 1266 return; 1267 1268 /* clear the cached keys on all assocs on this instance */ 1269 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 1270 SCTP_TCB_LOCK(stcb); 1271 sctp_clear_cachedkeys(stcb, keyid); 1272 SCTP_TCB_UNLOCK(stcb); 1273 } 1274 } 1275 1276 /* 1277 * delete a shared key from an association ASSUMES TCB_LOCK is already held 1278 */ 1279 int 1280 sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid) 1281 { 1282 sctp_sharedkey_t *skey; 1283 1284 if (stcb == NULL) 1285 return (-1); 1286 1287 /* is the keyid the assoc active sending key */ 1288 if (keyid == stcb->asoc.authinfo.assoc_keyid) 1289 return (-1); 1290 1291 /* does the key exist? */ 1292 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1293 if (skey == NULL) 1294 return (-1); 1295 1296 /* remove it */ 1297 LIST_REMOVE(skey, next); 1298 sctp_free_sharedkey(skey); /* frees skey->key as well */ 1299 1300 /* clear any cached keys */ 1301 sctp_clear_cachedkeys(stcb, keyid); 1302 return (0); 1303 } 1304 1305 /* 1306 * deletes a shared key from the endpoint ASSUMES INP_WLOCK is already held 1307 */ 1308 int 1309 sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid) 1310 { 1311 sctp_sharedkey_t *skey; 1312 struct sctp_tcb *stcb; 1313 1314 if (inp == NULL) 1315 return (-1); 1316 1317 /* is the keyid the active sending key on the endpoint or any assoc */ 1318 if (keyid == inp->sctp_ep.default_keyid) 1319 return (-1); 1320 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 1321 SCTP_TCB_LOCK(stcb); 1322 if (keyid == stcb->asoc.authinfo.assoc_keyid) { 1323 SCTP_TCB_UNLOCK(stcb); 1324 return (-1); 1325 } 1326 SCTP_TCB_UNLOCK(stcb); 1327 } 1328 1329 /* does the key exist? */ 1330 skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid); 1331 if (skey == NULL) 1332 return (-1); 1333 1334 /* remove it */ 1335 LIST_REMOVE(skey, next); 1336 sctp_free_sharedkey(skey); /* frees skey->key as well */ 1337 1338 /* clear any cached keys */ 1339 sctp_clear_cachedkeys_ep(inp, keyid); 1340 return (0); 1341 } 1342 1343 /* 1344 * set the active key on an association ASSUME TCB_LOCK is already held 1345 */ 1346 int 1347 sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid) 1348 { 1349 sctp_sharedkey_t *skey = NULL; 1350 sctp_key_t *key = NULL; 1351 int using_ep_key = 0; 1352 1353 /* find the key on the assoc */ 1354 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1355 if (skey == NULL) { 1356 /* if not on the assoc, find the key on the endpoint */ 1357 SCTP_INP_RLOCK(stcb->sctp_ep); 1358 skey = sctp_find_sharedkey(&stcb->sctp_ep->sctp_ep.shared_keys, 1359 keyid); 1360 using_ep_key = 1; 1361 } 1362 if (skey == NULL) { 1363 /* that key doesn't exist */ 1364 if (using_ep_key) 1365 SCTP_INP_RUNLOCK(stcb->sctp_ep); 1366 return (-1); 1367 } 1368 /* get the shared key text */ 1369 key = skey->key; 1370 1371 /* free any existing cached key */ 1372 if (stcb->asoc.authinfo.assoc_key != NULL) 1373 sctp_free_key(stcb->asoc.authinfo.assoc_key); 1374 /* compute a new assoc key and cache it */ 1375 stcb->asoc.authinfo.assoc_key = 1376 sctp_compute_hashkey(stcb->asoc.authinfo.random, 1377 stcb->asoc.authinfo.peer_random, key); 1378 stcb->asoc.authinfo.assoc_keyid = keyid; 1379 #ifdef SCTP_DEBUG 1380 if (SCTP_AUTH_DEBUG) 1381 sctp_print_key(stcb->asoc.authinfo.assoc_key, "Assoc Key"); 1382 #endif 1383 1384 if (using_ep_key) 1385 SCTP_INP_RUNLOCK(stcb->sctp_ep); 1386 return (0); 1387 } 1388 1389 /* 1390 * set the active key on an endpoint ASSUMES INP_WLOCK is already held 1391 */ 1392 int 1393 sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid) 1394 { 1395 sctp_sharedkey_t *skey; 1396 1397 /* find the key */ 1398 skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid); 1399 if (skey == NULL) { 1400 /* that key doesn't exist */ 1401 return (-1); 1402 } 1403 inp->sctp_ep.default_keyid = keyid; 1404 return (0); 1405 } 1406 1407 /* 1408 * get local authentication parameters from cookie (from INIT-ACK) 1409 */ 1410 void 1411 sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m, 1412 uint32_t offset, uint32_t length) 1413 { 1414 struct sctp_paramhdr *phdr, tmp_param; 1415 uint16_t plen, ptype; 1416 uint8_t store[384]; 1417 struct sctp_auth_random *random = NULL; 1418 uint16_t random_len = 0; 1419 struct sctp_auth_hmac_algo *hmacs = NULL; 1420 uint16_t hmacs_len = 0; 1421 struct sctp_auth_chunk_list *chunks = NULL; 1422 uint16_t num_chunks = 0; 1423 sctp_key_t *new_key; 1424 uint32_t keylen; 1425 1426 /* convert to upper bound */ 1427 length += offset; 1428 1429 phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, 1430 sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); 1431 while (phdr != NULL) { 1432 ptype = ntohs(phdr->param_type); 1433 plen = ntohs(phdr->param_length); 1434 1435 if ((plen == 0) || (offset + plen > length)) 1436 break; 1437 1438 if (ptype == SCTP_RANDOM) { 1439 if (plen > sizeof(store)) 1440 break; 1441 phdr = sctp_get_next_param(m, offset, 1442 (struct sctp_paramhdr *)store, plen); 1443 if (phdr == NULL) 1444 return; 1445 /* save the random and length for the key */ 1446 random = (struct sctp_auth_random *)phdr; 1447 random_len = plen - sizeof(*random); 1448 } else if (ptype == SCTP_HMAC_LIST) { 1449 int num_hmacs; 1450 int i; 1451 1452 if (plen > sizeof(store)) 1453 break; 1454 phdr = sctp_get_next_param(m, offset, 1455 (struct sctp_paramhdr *)store, plen); 1456 if (phdr == NULL) 1457 return; 1458 /* save the hmacs list and num for the key */ 1459 hmacs = (struct sctp_auth_hmac_algo *)phdr; 1460 hmacs_len = plen - sizeof(*hmacs); 1461 num_hmacs = hmacs_len / sizeof(hmacs->hmac_ids[0]); 1462 if (stcb->asoc.local_hmacs != NULL) 1463 sctp_free_hmaclist(stcb->asoc.local_hmacs); 1464 stcb->asoc.local_hmacs = sctp_alloc_hmaclist(num_hmacs); 1465 if (stcb->asoc.local_hmacs != NULL) { 1466 for (i = 0; i < num_hmacs; i++) { 1467 sctp_auth_add_hmacid(stcb->asoc.local_hmacs, 1468 ntohs(hmacs->hmac_ids[i])); 1469 } 1470 } 1471 } else if (ptype == SCTP_CHUNK_LIST) { 1472 int i; 1473 1474 if (plen > sizeof(store)) 1475 break; 1476 phdr = sctp_get_next_param(m, offset, 1477 (struct sctp_paramhdr *)store, plen); 1478 if (phdr == NULL) 1479 return; 1480 chunks = (struct sctp_auth_chunk_list *)phdr; 1481 num_chunks = plen - sizeof(*chunks); 1482 /* save chunks list and num for the key */ 1483 if (stcb->asoc.local_auth_chunks != NULL) 1484 sctp_clear_chunklist(stcb->asoc.local_auth_chunks); 1485 else 1486 stcb->asoc.local_auth_chunks = sctp_alloc_chunklist(); 1487 for (i = 0; i < num_chunks; i++) { 1488 sctp_auth_add_chunk(chunks->chunk_types[i], 1489 stcb->asoc.local_auth_chunks); 1490 } 1491 } 1492 /* get next parameter */ 1493 offset += SCTP_SIZE32(plen); 1494 if (offset + sizeof(struct sctp_paramhdr) > length) 1495 break; 1496 phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), 1497 (uint8_t *) & tmp_param); 1498 } 1499 /* concatenate the full random key */ 1500 keylen = random_len + num_chunks + hmacs_len; 1501 new_key = sctp_alloc_key(keylen); 1502 if (new_key != NULL) { 1503 /* copy in the RANDOM */ 1504 if (random != NULL) 1505 bcopy(random->random_data, new_key->key, random_len); 1506 /* append in the AUTH chunks */ 1507 if (chunks != NULL) 1508 bcopy(chunks->chunk_types, new_key->key + random_len, 1509 num_chunks); 1510 /* append in the HMACs */ 1511 if (hmacs != NULL) 1512 bcopy(hmacs->hmac_ids, new_key->key + random_len + num_chunks, 1513 hmacs_len); 1514 } 1515 if (stcb->asoc.authinfo.random != NULL) 1516 sctp_free_key(stcb->asoc.authinfo.random); 1517 stcb->asoc.authinfo.random = new_key; 1518 stcb->asoc.authinfo.random_len = random_len; 1519 #ifdef SCTP_AUTH_DRAFT_04 1520 /* don't include the chunks and hmacs for draft -04 */ 1521 stcb->asoc.authinfo.random->keylen = random_len; 1522 #endif 1523 sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.assoc_keyid); 1524 sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.recv_keyid); 1525 1526 /* negotiate what HMAC to use for the peer */ 1527 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 1528 stcb->asoc.local_hmacs); 1529 /* copy defaults from the endpoint */ 1530 /* FIX ME: put in cookie? */ 1531 stcb->asoc.authinfo.assoc_keyid = stcb->sctp_ep->sctp_ep.default_keyid; 1532 } 1533 1534 /* 1535 * compute and fill in the HMAC digest for a packet 1536 */ 1537 void 1538 sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset, 1539 struct sctp_auth_chunk *auth, struct sctp_tcb *stcb) 1540 { 1541 uint32_t digestlen; 1542 sctp_sharedkey_t *skey; 1543 sctp_key_t *key; 1544 1545 if ((stcb == NULL) || (auth == NULL)) 1546 return; 1547 1548 /* zero the digest + chunk padding */ 1549 digestlen = sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id); 1550 bzero(auth->hmac, SCTP_SIZE32(digestlen)); 1551 /* is an assoc key cached? */ 1552 if (stcb->asoc.authinfo.assoc_key == NULL) { 1553 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, 1554 stcb->asoc.authinfo.assoc_keyid); 1555 if (skey == NULL) { 1556 /* not in the assoc list, so check the endpoint list */ 1557 skey = sctp_find_sharedkey(&stcb->sctp_ep->sctp_ep.shared_keys, 1558 stcb->asoc.authinfo.assoc_keyid); 1559 } 1560 /* the only way skey is NULL is if null key id 0 is used */ 1561 if (skey != NULL) 1562 key = skey->key; 1563 else 1564 key = NULL; 1565 /* compute a new assoc key and cache it */ 1566 stcb->asoc.authinfo.assoc_key = 1567 sctp_compute_hashkey(stcb->asoc.authinfo.random, 1568 stcb->asoc.authinfo.peer_random, key); 1569 #ifdef SCTP_DEBUG 1570 if (SCTP_AUTH_DEBUG) { 1571 printf("caching key id %u\n", 1572 stcb->asoc.authinfo.assoc_keyid); 1573 sctp_print_key(stcb->asoc.authinfo.assoc_key, "Assoc Key"); 1574 } 1575 #endif 1576 } 1577 /* set in the active key id */ 1578 auth->shared_key_id = htons(stcb->asoc.authinfo.assoc_keyid); 1579 1580 /* compute and fill in the digest */ 1581 (void)sctp_compute_hmac_m(stcb->asoc.peer_hmac_id, 1582 stcb->asoc.authinfo.assoc_key, 1583 m, auth_offset, auth->hmac); 1584 } 1585 1586 1587 static void 1588 sctp_bzero_m(struct mbuf *m, uint32_t m_offset, uint32_t size) 1589 { 1590 struct mbuf *m_tmp; 1591 uint8_t *data; 1592 1593 /* sanity check */ 1594 if (m == NULL) 1595 return; 1596 1597 /* find the correct starting mbuf and offset (get start position) */ 1598 m_tmp = m; 1599 while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) { 1600 m_offset -= SCTP_BUF_LEN(m_tmp); 1601 m_tmp = SCTP_BUF_NEXT(m_tmp); 1602 } 1603 /* now use the rest of the mbuf chain */ 1604 while ((m_tmp != NULL) && (size > 0)) { 1605 data = mtod(m_tmp, uint8_t *) + m_offset; 1606 if (size > (uint32_t) SCTP_BUF_LEN(m_tmp)) { 1607 bzero(data, SCTP_BUF_LEN(m_tmp)); 1608 size -= SCTP_BUF_LEN(m_tmp); 1609 } else { 1610 bzero(data, size); 1611 size = 0; 1612 } 1613 /* clear the offset since it's only for the first mbuf */ 1614 m_offset = 0; 1615 m_tmp = SCTP_BUF_NEXT(m_tmp); 1616 } 1617 } 1618 1619 /* 1620 * process the incoming Authentication chunk return codes: -1 on any 1621 * authentication error 0 on authentication verification 1622 */ 1623 int 1624 sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *auth, 1625 struct mbuf *m, uint32_t offset) 1626 { 1627 uint16_t chunklen; 1628 uint16_t shared_key_id; 1629 uint16_t hmac_id; 1630 sctp_sharedkey_t *skey; 1631 uint32_t digestlen; 1632 uint8_t digest[SCTP_AUTH_DIGEST_LEN_MAX]; 1633 uint8_t computed_digest[SCTP_AUTH_DIGEST_LEN_MAX]; 1634 1635 /* auth is checked for NULL by caller */ 1636 chunklen = ntohs(auth->ch.chunk_length); 1637 if (chunklen < sizeof(*auth)) { 1638 SCTP_STAT_INCR(sctps_recvauthfailed); 1639 return (-1); 1640 } 1641 SCTP_STAT_INCR(sctps_recvauth); 1642 1643 /* get the auth params */ 1644 shared_key_id = ntohs(auth->shared_key_id); 1645 hmac_id = ntohs(auth->hmac_id); 1646 #ifdef SCTP_DEBUG 1647 if (SCTP_AUTH_DEBUG) 1648 printf("SCTP AUTH Chunk: shared key %u, HMAC id %u\n", 1649 shared_key_id, hmac_id); 1650 #endif 1651 1652 /* is the indicated HMAC supported? */ 1653 if (!sctp_auth_is_supported_hmac(stcb->asoc.local_hmacs, hmac_id)) { 1654 struct mbuf *m_err; 1655 struct sctp_auth_invalid_hmac *err; 1656 1657 SCTP_STAT_INCR(sctps_recvivalhmacid); 1658 #ifdef SCTP_DEBUG 1659 if (SCTP_AUTH_DEBUG) 1660 printf("SCTP Auth: unsupported HMAC id %u\n", hmac_id); 1661 #endif 1662 /* 1663 * report this in an Error Chunk: Unsupported HMAC 1664 * Identifier 1665 */ 1666 m_err = sctp_get_mbuf_for_msg(sizeof(*err), 0, M_DONTWAIT, 1, MT_HEADER); 1667 if (m_err != NULL) { 1668 /* pre-reserve some space */ 1669 SCTP_BUF_RESV_UF(m_err, sizeof(struct sctp_chunkhdr)); 1670 /* fill in the error */ 1671 err = mtod(m_err, struct sctp_auth_invalid_hmac *); 1672 bzero(err, sizeof(*err)); 1673 err->ph.param_type = htons(SCTP_CAUSE_UNSUPPORTED_HMACID); 1674 err->ph.param_length = htons(sizeof(*err)); 1675 err->hmac_id = ntohs(hmac_id); 1676 SCTP_BUF_LEN(m_err) = sizeof(*err); 1677 /* queue it */ 1678 sctp_queue_op_err(stcb, m_err); 1679 } 1680 return (-1); 1681 } 1682 /* get the indicated shared key, if available */ 1683 if ((stcb->asoc.authinfo.recv_key == NULL) || 1684 (stcb->asoc.authinfo.recv_keyid != shared_key_id)) { 1685 /* find the shared key on the assoc first */ 1686 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, shared_key_id); 1687 if (skey == NULL) { 1688 /* if not on the assoc, find it on the endpoint */ 1689 skey = sctp_find_sharedkey(&stcb->sctp_ep->sctp_ep.shared_keys, 1690 shared_key_id); 1691 } 1692 /* if the shared key isn't found, discard the chunk */ 1693 if (skey == NULL) { 1694 SCTP_STAT_INCR(sctps_recvivalkeyid); 1695 #ifdef SCTP_DEBUG 1696 if (SCTP_AUTH_DEBUG) 1697 printf("SCTP Auth: unknown key id %u\n", 1698 shared_key_id); 1699 #endif 1700 return (-1); 1701 } 1702 /* generate a notification if this is a new key id */ 1703 if (stcb->asoc.authinfo.recv_keyid != shared_key_id) 1704 /* 1705 * sctp_ulp_notify(SCTP_NOTIFY_AUTH_NEW_KEY, stcb, 1706 * shared_key_id, (void 1707 * *)stcb->asoc.authinfo.recv_keyid); 1708 */ 1709 sctp_notify_authentication(stcb, SCTP_AUTH_NEWKEY, 1710 shared_key_id, stcb->asoc.authinfo.recv_keyid); 1711 /* compute a new recv assoc key and cache it */ 1712 if (stcb->asoc.authinfo.recv_key != NULL) 1713 sctp_free_key(stcb->asoc.authinfo.recv_key); 1714 stcb->asoc.authinfo.recv_key = 1715 sctp_compute_hashkey(stcb->asoc.authinfo.random, 1716 stcb->asoc.authinfo.peer_random, skey->key); 1717 stcb->asoc.authinfo.recv_keyid = shared_key_id; 1718 #ifdef SCTP_DEBUG 1719 if (SCTP_AUTH_DEBUG) 1720 sctp_print_key(stcb->asoc.authinfo.recv_key, "Recv Key"); 1721 #endif 1722 } 1723 /* validate the digest length */ 1724 digestlen = sctp_get_hmac_digest_len(hmac_id); 1725 if (chunklen < (sizeof(*auth) + digestlen)) { 1726 /* invalid digest length */ 1727 SCTP_STAT_INCR(sctps_recvauthfailed); 1728 #ifdef SCTP_DEBUG 1729 if (SCTP_AUTH_DEBUG) 1730 printf("SCTP Auth: chunk too short for HMAC\n"); 1731 #endif 1732 return (-1); 1733 } 1734 /* save a copy of the digest, zero the pseudo header, and validate */ 1735 bcopy(auth->hmac, digest, digestlen); 1736 sctp_bzero_m(m, offset + sizeof(*auth), SCTP_SIZE32(digestlen)); 1737 (void)sctp_compute_hmac_m(hmac_id, stcb->asoc.authinfo.recv_key, 1738 m, offset, computed_digest); 1739 1740 /* compare the computed digest with the one in the AUTH chunk */ 1741 if (memcmp(digest, computed_digest, digestlen) != 0) { 1742 SCTP_STAT_INCR(sctps_recvauthfailed); 1743 #ifdef SCTP_DEBUG 1744 if (SCTP_AUTH_DEBUG) 1745 printf("SCTP Auth: HMAC digest check failed\n"); 1746 #endif 1747 return (-1); 1748 } 1749 return (0); 1750 } 1751 1752 /* 1753 * Generate NOTIFICATION 1754 */ 1755 void 1756 sctp_notify_authentication(struct sctp_tcb *stcb, uint32_t indication, 1757 uint16_t keyid, uint16_t alt_keyid) 1758 { 1759 struct mbuf *m_notify; 1760 struct sctp_authkey_event *auth; 1761 struct sctp_queued_to_read *control; 1762 1763 if (sctp_is_feature_off(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTHEVNT)) 1764 /* event not enabled */ 1765 return; 1766 1767 m_notify = sctp_get_mbuf_for_msg(sizeof(struct sctp_authkey_event), 1768 0, M_DONTWAIT, 1, MT_HEADER); 1769 if (m_notify == NULL) 1770 /* no space left */ 1771 return; 1772 1773 SCTP_BUF_LEN(m_notify) = 0; 1774 auth = mtod(m_notify, struct sctp_authkey_event *); 1775 auth->auth_type = SCTP_AUTHENTICATION_EVENT; 1776 auth->auth_flags = 0; 1777 auth->auth_length = sizeof(*auth); 1778 auth->auth_keynumber = keyid; 1779 auth->auth_altkeynumber = alt_keyid; 1780 auth->auth_indication = indication; 1781 auth->auth_assoc_id = sctp_get_associd(stcb); 1782 1783 SCTP_BUF_LEN(m_notify) = sizeof(*auth); 1784 SCTP_BUF_NEXT(m_notify) = NULL; 1785 1786 /* append to socket */ 1787 control = sctp_build_readq_entry(stcb, stcb->asoc.primary_destination, 1788 0, 0, 0, 0, 0, 0, m_notify); 1789 if (control == NULL) { 1790 /* no memory */ 1791 sctp_m_freem(m_notify); 1792 return; 1793 } 1794 control->spec_flags = M_NOTIFICATION; 1795 control->length = SCTP_BUF_LEN(m_notify); 1796 /* not that we need this */ 1797 control->tail_mbuf = m_notify; 1798 sctp_add_to_readq(stcb->sctp_ep, stcb, control, 1799 &stcb->sctp_socket->so_rcv, 1); 1800 } 1801 1802 1803 /* 1804 * validates the AUTHentication related parameters in an INIT/INIT-ACK 1805 * Note: currently only used for INIT as INIT-ACK is handled inline 1806 * with sctp_load_addresses_from_init() 1807 */ 1808 int 1809 sctp_validate_init_auth_params(struct mbuf *m, int offset, int limit) 1810 { 1811 struct sctp_paramhdr *phdr, parm_buf; 1812 uint16_t ptype, plen; 1813 int peer_supports_asconf = 0; 1814 int peer_supports_auth = 0; 1815 int got_random = 0, got_hmacs = 0; 1816 1817 /* go through each of the params. */ 1818 phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf)); 1819 while (phdr) { 1820 ptype = ntohs(phdr->param_type); 1821 plen = ntohs(phdr->param_length); 1822 1823 if (offset + plen > limit) { 1824 break; 1825 } 1826 if (plen == 0) { 1827 break; 1828 } 1829 if (ptype == SCTP_SUPPORTED_CHUNK_EXT) { 1830 /* A supported extension chunk */ 1831 struct sctp_supported_chunk_types_param *pr_supported; 1832 uint8_t local_store[128]; 1833 int num_ent, i; 1834 1835 phdr = sctp_get_next_param(m, offset, 1836 (struct sctp_paramhdr *)&local_store, plen); 1837 if (phdr == NULL) { 1838 return (-1); 1839 } 1840 pr_supported = (struct sctp_supported_chunk_types_param *)phdr; 1841 num_ent = plen - sizeof(struct sctp_paramhdr); 1842 for (i = 0; i < num_ent; i++) { 1843 switch (pr_supported->chunk_types[i]) { 1844 case SCTP_ASCONF: 1845 case SCTP_ASCONF_ACK: 1846 peer_supports_asconf = 1; 1847 break; 1848 case SCTP_AUTHENTICATION: 1849 peer_supports_auth = 1; 1850 break; 1851 default: 1852 /* one we don't care about */ 1853 break; 1854 } 1855 } 1856 } else if (ptype == SCTP_RANDOM) { 1857 got_random = 1; 1858 /* enforce the random length */ 1859 if (plen != (sizeof(struct sctp_auth_random) + 1860 SCTP_AUTH_RANDOM_SIZE_REQUIRED)) { 1861 #ifdef SCTP_DEBUG 1862 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1863 printf("SCTP: invalid RANDOM len\n"); 1864 #endif 1865 return (-1); 1866 } 1867 } else if (ptype == SCTP_HMAC_LIST) { 1868 uint8_t store[256]; 1869 struct sctp_auth_hmac_algo *hmacs; 1870 int num_hmacs; 1871 1872 if (plen > sizeof(store)) 1873 break; 1874 phdr = sctp_get_next_param(m, offset, 1875 (struct sctp_paramhdr *)store, plen); 1876 if (phdr == NULL) 1877 return (-1); 1878 hmacs = (struct sctp_auth_hmac_algo *)phdr; 1879 num_hmacs = (plen - sizeof(*hmacs)) / 1880 sizeof(hmacs->hmac_ids[0]); 1881 /* validate the hmac list */ 1882 if (sctp_verify_hmac_param(hmacs, num_hmacs)) { 1883 #ifdef SCTP_DEBUG 1884 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1885 printf("SCTP: invalid HMAC param\n"); 1886 #endif 1887 return (-1); 1888 } 1889 got_hmacs = 1; 1890 } 1891 offset += SCTP_SIZE32(plen); 1892 if (offset >= limit) { 1893 break; 1894 } 1895 phdr = sctp_get_next_param(m, offset, &parm_buf, 1896 sizeof(parm_buf)); 1897 } 1898 /* validate authentication required parameters */ 1899 if (got_random && got_hmacs) { 1900 peer_supports_auth = 1; 1901 } else { 1902 peer_supports_auth = 0; 1903 } 1904 if (!sctp_asconf_auth_nochk && peer_supports_asconf && 1905 !peer_supports_auth) { 1906 #ifdef SCTP_DEBUG 1907 if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1908 printf("SCTP: peer supports ASCONF but not AUTH\n"); 1909 #endif 1910 return (-1); 1911 } 1912 return (0); 1913 } 1914 1915 void 1916 sctp_initialize_auth_params(struct sctp_inpcb *inp, struct sctp_tcb *stcb) 1917 { 1918 uint16_t chunks_len = 0; 1919 uint16_t hmacs_len = 0; 1920 uint16_t random_len = sctp_auth_random_len; 1921 sctp_key_t *new_key; 1922 uint16_t keylen; 1923 1924 /* initialize hmac list from endpoint */ 1925 stcb->asoc.local_hmacs = sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 1926 if (stcb->asoc.local_hmacs != NULL) { 1927 hmacs_len = stcb->asoc.local_hmacs->num_algo * 1928 sizeof(stcb->asoc.local_hmacs->hmac[0]); 1929 } 1930 /* initialize auth chunks list from endpoint */ 1931 stcb->asoc.local_auth_chunks = 1932 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 1933 if (stcb->asoc.local_auth_chunks != NULL) { 1934 int i; 1935 1936 for (i = 0; i < 256; i++) { 1937 if (stcb->asoc.local_auth_chunks->chunks[i]) 1938 chunks_len++; 1939 } 1940 } 1941 /* copy defaults from the endpoint */ 1942 stcb->asoc.authinfo.assoc_keyid = inp->sctp_ep.default_keyid; 1943 1944 /* now set the concatenated key (random + chunks + hmacs) */ 1945 keylen = random_len + chunks_len + hmacs_len; 1946 new_key = sctp_alloc_key(keylen); 1947 if (new_key != NULL) { 1948 /* generate and copy in the RANDOM */ 1949 SCTP_READ_RANDOM(new_key->key, random_len); 1950 keylen = random_len; 1951 /* append in the AUTH chunks */ 1952 if (stcb->asoc.local_auth_chunks) { 1953 int i; 1954 1955 for (i = 0; i < 256; i++) { 1956 if (stcb->asoc.local_auth_chunks->chunks[i]) 1957 new_key->key[keylen++] = i; 1958 } 1959 } 1960 /* append in the HMACs */ 1961 sctp_serialize_hmaclist(stcb->asoc.local_hmacs, 1962 new_key->key + keylen); 1963 } 1964 if (stcb->asoc.authinfo.random != NULL) 1965 sctp_free_key(stcb->asoc.authinfo.random); 1966 stcb->asoc.authinfo.random = new_key; 1967 stcb->asoc.authinfo.random_len = random_len; 1968 #ifdef SCTP_AUTH_DRAFT_04 1969 /* don't include the chunks and hmacs for draft -04 */ 1970 stcb->asoc.authinfo.random->keylen = random_len; 1971 #endif 1972 } 1973 1974 1975 #ifdef SCTP_HMAC_TEST 1976 /* 1977 * HMAC and key concatenation tests 1978 */ 1979 static void 1980 sctp_print_digest(uint8_t * digest, uint32_t digestlen, const char *str) 1981 { 1982 uint32_t i; 1983 1984 printf("\n%s: 0x", str); 1985 if (digest == NULL) 1986 return; 1987 1988 for (i = 0; i < digestlen; i++) 1989 printf("%02x", digest[i]); 1990 } 1991 1992 static int 1993 sctp_test_hmac(const char *str, uint16_t hmac_id, uint8_t * key, 1994 uint32_t keylen, uint8_t * text, uint32_t textlen, 1995 uint8_t * digest, uint32_t digestlen) 1996 { 1997 uint8_t computed_digest[SCTP_AUTH_DIGEST_LEN_MAX]; 1998 1999 printf("\n%s:", str); 2000 sctp_hmac(hmac_id, key, keylen, text, textlen, computed_digest); 2001 sctp_print_digest(digest, digestlen, "Expected digest"); 2002 sctp_print_digest(computed_digest, digestlen, "Computed digest"); 2003 if (memcmp(digest, computed_digest, digestlen) != 0) { 2004 printf("\nFAILED"); 2005 return (-1); 2006 } else { 2007 printf("\nPASSED"); 2008 return (0); 2009 } 2010 } 2011 2012 2013 /* 2014 * RFC 2202: HMAC-SHA1 test cases 2015 */ 2016 void 2017 sctp_test_hmac_sha1(void) 2018 { 2019 uint8_t *digest; 2020 uint8_t key[128]; 2021 uint32_t keylen; 2022 uint8_t text[128]; 2023 uint32_t textlen; 2024 uint32_t digestlen = 20; 2025 int failed = 0; 2026 2027 /* 2028 * test_case = 1 key = 2029 * 0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b key_len = 20 2030 * data = "Hi There" data_len = 8 digest = 2031 * 0xb617318655057264e28bc0b6fb378c8ef146be00 2032 */ 2033 keylen = 20; 2034 memset(key, 0x0b, keylen); 2035 textlen = 8; 2036 strcpy(text, "Hi There"); 2037 digest = "\xb6\x17\x31\x86\x55\x05\x72\x64\xe2\x8b\xc0\xb6\xfb\x37\x8c\x8e\xf1\x46\xbe\x00"; 2038 if (sctp_test_hmac("SHA1 test case 1", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2039 text, textlen, digest, digestlen) < 0) 2040 failed++; 2041 2042 /* 2043 * test_case = 2 key = "Jefe" key_len = 4 data = 2044 * "what do ya want for nothing?" data_len = 28 digest = 2045 * 0xeffcdf6ae5eb2fa2d27416d5f184df9c259a7c79 2046 */ 2047 keylen = 4; 2048 strcpy(key, "Jefe"); 2049 textlen = 28; 2050 strcpy(text, "what do ya want for nothing?"); 2051 digest = "\xef\xfc\xdf\x6a\xe5\xeb\x2f\xa2\xd2\x74\x16\xd5\xf1\x84\xdf\x9c\x25\x9a\x7c\x79"; 2052 if (sctp_test_hmac("SHA1 test case 2", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2053 text, textlen, digest, digestlen) < 0) 2054 failed++; 2055 2056 /* 2057 * test_case = 3 key = 2058 * 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa key_len = 20 2059 * data = 0xdd repeated 50 times data_len = 50 digest 2060 * = 0x125d7342b9ac11cd91a39af48aa17b4f63f175d3 2061 */ 2062 keylen = 20; 2063 memset(key, 0xaa, keylen); 2064 textlen = 50; 2065 memset(text, 0xdd, textlen); 2066 digest = "\x12\x5d\x73\x42\xb9\xac\x11\xcd\x91\xa3\x9a\xf4\x8a\xa1\x7b\x4f\x63\xf1\x75\xd3"; 2067 if (sctp_test_hmac("SHA1 test case 3", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2068 text, textlen, digest, digestlen) < 0) 2069 failed++; 2070 2071 /* 2072 * test_case = 4 key = 2073 * 0x0102030405060708090a0b0c0d0e0f10111213141516171819 key_len = 25 2074 * data = 0xcd repeated 50 times data_len = 50 digest 2075 * = 0x4c9007f4026250c6bc8414f9bf50c86c2d7235da 2076 */ 2077 keylen = 25; 2078 memcpy(key, "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19", keylen); 2079 textlen = 50; 2080 memset(text, 0xcd, textlen); 2081 digest = "\x4c\x90\x07\xf4\x02\x62\x50\xc6\xbc\x84\x14\xf9\xbf\x50\xc8\x6c\x2d\x72\x35\xda"; 2082 if (sctp_test_hmac("SHA1 test case 4", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2083 text, textlen, digest, digestlen) < 0) 2084 failed++; 2085 2086 /* 2087 * test_case = 5 key = 2088 * 0x0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c key_len = 20 2089 * data = "Test With Truncation" data_len = 20 digest 2090 * = 0x4c1a03424b55e07fe7f27be1d58bb9324a9a5a04 digest-96 = 2091 * 0x4c1a03424b55e07fe7f27be1 2092 */ 2093 keylen = 20; 2094 memset(key, 0x0c, keylen); 2095 textlen = 20; 2096 strcpy(text, "Test With Truncation"); 2097 digest = "\x4c\x1a\x03\x42\x4b\x55\xe0\x7f\xe7\xf2\x7b\xe1\xd5\x8b\xb9\x32\x4a\x9a\x5a\x04"; 2098 if (sctp_test_hmac("SHA1 test case 5", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2099 text, textlen, digest, digestlen) < 0) 2100 failed++; 2101 2102 /* 2103 * test_case = 6 key = 0xaa repeated 80 times key_len 2104 * = 80 data = "Test Using Larger Than Block-Size Key - 2105 * Hash Key First" data_len = 54 digest = 2106 * 0xaa4ae5e15272d00e95705637ce8a3b55ed402112 2107 */ 2108 keylen = 80; 2109 memset(key, 0xaa, keylen); 2110 textlen = 54; 2111 strcpy(text, "Test Using Larger Than Block-Size Key - Hash Key First"); 2112 digest = "\xaa\x4a\xe5\xe1\x52\x72\xd0\x0e\x95\x70\x56\x37\xce\x8a\x3b\x55\xed\x40\x21\x12"; 2113 if (sctp_test_hmac("SHA1 test case 6", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2114 text, textlen, digest, digestlen) < 0) 2115 failed++; 2116 2117 /* 2118 * test_case = 7 key = 0xaa repeated 80 times key_len 2119 * = 80 data = "Test Using Larger Than Block-Size Key and 2120 * Larger Than One Block-Size Data" data_len = 73 digest = 2121 * 0xe8e99d0f45237d786d6bbaa7965c7808bbff1a91 2122 */ 2123 keylen = 80; 2124 memset(key, 0xaa, keylen); 2125 textlen = 73; 2126 strcpy(text, "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"); 2127 digest = "\xe8\xe9\x9d\x0f\x45\x23\x7d\x78\x6d\x6b\xba\xa7\x96\x5c\x78\x08\xbb\xff\x1a\x91"; 2128 if (sctp_test_hmac("SHA1 test case 7", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2129 text, textlen, digest, digestlen) < 0) 2130 failed++; 2131 2132 /* done with all tests */ 2133 if (failed) 2134 printf("\nSHA1 test results: %d cases failed", failed); 2135 else 2136 printf("\nSHA1 test results: all test cases passed"); 2137 } 2138 2139 /* 2140 * RFC 2202: HMAC-MD5 test cases 2141 */ 2142 void 2143 sctp_test_hmac_md5(void) 2144 { 2145 uint8_t *digest; 2146 uint8_t key[128]; 2147 uint32_t keylen; 2148 uint8_t text[128]; 2149 uint32_t textlen; 2150 uint32_t digestlen = 16; 2151 int failed = 0; 2152 2153 /* 2154 * test_case = 1 key = 0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b 2155 * key_len = 16 data = "Hi There" data_len = 8 digest = 2156 * 0x9294727a3638bb1c13f48ef8158bfc9d 2157 */ 2158 keylen = 16; 2159 memset(key, 0x0b, keylen); 2160 textlen = 8; 2161 strcpy(text, "Hi There"); 2162 digest = "\x92\x94\x72\x7a\x36\x38\xbb\x1c\x13\xf4\x8e\xf8\x15\x8b\xfc\x9d"; 2163 if (sctp_test_hmac("MD5 test case 1", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2164 text, textlen, digest, digestlen) < 0) 2165 failed++; 2166 2167 /* 2168 * test_case = 2 key = "Jefe" key_len = 4 data = 2169 * "what do ya want for nothing?" data_len = 28 digest = 2170 * 0x750c783e6ab0b503eaa86e310a5db738 2171 */ 2172 keylen = 4; 2173 strcpy(key, "Jefe"); 2174 textlen = 28; 2175 strcpy(text, "what do ya want for nothing?"); 2176 digest = "\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38"; 2177 if (sctp_test_hmac("MD5 test case 2", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2178 text, textlen, digest, digestlen) < 0) 2179 failed++; 2180 2181 /* 2182 * test_case = 3 key = 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 2183 * key_len = 16 data = 0xdd repeated 50 times data_len = 50 2184 * digest = 0x56be34521d144c88dbb8c733f0e8b3f6 2185 */ 2186 keylen = 16; 2187 memset(key, 0xaa, keylen); 2188 textlen = 50; 2189 memset(text, 0xdd, textlen); 2190 digest = "\x56\xbe\x34\x52\x1d\x14\x4c\x88\xdb\xb8\xc7\x33\xf0\xe8\xb3\xf6"; 2191 if (sctp_test_hmac("MD5 test case 3", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2192 text, textlen, digest, digestlen) < 0) 2193 failed++; 2194 2195 /* 2196 * test_case = 4 key = 2197 * 0x0102030405060708090a0b0c0d0e0f10111213141516171819 key_len = 25 2198 * data = 0xcd repeated 50 times data_len = 50 digest 2199 * = 0x697eaf0aca3a3aea3a75164746ffaa79 2200 */ 2201 keylen = 25; 2202 memcpy(key, "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19", keylen); 2203 textlen = 50; 2204 memset(text, 0xcd, textlen); 2205 digest = "\x69\x7e\xaf\x0a\xca\x3a\x3a\xea\x3a\x75\x16\x47\x46\xff\xaa\x79"; 2206 if (sctp_test_hmac("MD5 test case 4", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2207 text, textlen, digest, digestlen) < 0) 2208 failed++; 2209 2210 /* 2211 * test_case = 5 key = 0x0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c 2212 * key_len = 16 data = "Test With Truncation" data_len = 20 2213 * digest = 0x56461ef2342edc00f9bab995690efd4c digest-96 2214 * 0x56461ef2342edc00f9bab995 2215 */ 2216 keylen = 16; 2217 memset(key, 0x0c, keylen); 2218 textlen = 20; 2219 strcpy(text, "Test With Truncation"); 2220 digest = "\x56\x46\x1e\xf2\x34\x2e\xdc\x00\xf9\xba\xb9\x95\x69\x0e\xfd\x4c"; 2221 if (sctp_test_hmac("MD5 test case 5", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2222 text, textlen, digest, digestlen) < 0) 2223 failed++; 2224 2225 /* 2226 * test_case = 6 key = 0xaa repeated 80 times key_len 2227 * = 80 data = "Test Using Larger Than Block-Size Key - 2228 * Hash Key First" data_len = 54 digest = 2229 * 0x6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd 2230 */ 2231 keylen = 80; 2232 memset(key, 0xaa, keylen); 2233 textlen = 54; 2234 strcpy(text, "Test Using Larger Than Block-Size Key - Hash Key First"); 2235 digest = "\x6b\x1a\xb7\xfe\x4b\xd7\xbf\x8f\x0b\x62\xe6\xce\x61\xb9\xd0\xcd"; 2236 if (sctp_test_hmac("MD5 test case 6", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2237 text, textlen, digest, digestlen) < 0) 2238 failed++; 2239 2240 /* 2241 * test_case = 7 key = 0xaa repeated 80 times key_len 2242 * = 80 data = "Test Using Larger Than Block-Size Key and 2243 * Larger Than One Block-Size Data" data_len = 73 digest = 2244 * 0x6f630fad67cda0ee1fb1f562db3aa53e 2245 */ 2246 keylen = 80; 2247 memset(key, 0xaa, keylen); 2248 textlen = 73; 2249 strcpy(text, "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"); 2250 digest = "\x6f\x63\x0f\xad\x67\xcd\xa0\xee\x1f\xb1\xf5\x62\xdb\x3a\xa5\x3e"; 2251 if (sctp_test_hmac("MD5 test case 7", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2252 text, textlen, digest, digestlen) < 0) 2253 failed++; 2254 2255 /* done with all tests */ 2256 if (failed) 2257 printf("\nMD5 test results: %d cases failed", failed); 2258 else 2259 printf("\nMD5 test results: all test cases passed"); 2260 } 2261 2262 /* 2263 * test assoc key concatenation 2264 */ 2265 static int 2266 sctp_test_key_concatenation(sctp_key_t * key1, sctp_key_t * key2, 2267 sctp_key_t * expected_key) 2268 { 2269 sctp_key_t *key; 2270 int ret_val; 2271 2272 sctp_show_key(key1, "\nkey1"); 2273 sctp_show_key(key2, "\nkey2"); 2274 key = sctp_compute_hashkey(key1, key2, NULL); 2275 sctp_show_key(expected_key, "\nExpected"); 2276 sctp_show_key(key, "\nComputed"); 2277 if (memcmp(key, expected_key, expected_key->keylen) != 0) { 2278 printf("\nFAILED"); 2279 ret_val = -1; 2280 } else { 2281 printf("\nPASSED"); 2282 ret_val = 0; 2283 } 2284 sctp_free_key(key1); 2285 sctp_free_key(key2); 2286 sctp_free_key(expected_key); 2287 sctp_free_key(key); 2288 return (ret_val); 2289 } 2290 2291 2292 void 2293 sctp_test_authkey(void) 2294 { 2295 sctp_key_t *key1, *key2, *expected_key; 2296 int failed = 0; 2297 2298 /* test case 1 */ 2299 key1 = sctp_set_key("\x01\x01\x01\x01", 4); 2300 key2 = sctp_set_key("\x01\x02\x03\x04", 4); 2301 expected_key = sctp_set_key("\x01\x01\x01\x01\x01\x02\x03\x04", 8); 2302 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2303 failed++; 2304 2305 /* test case 2 */ 2306 key1 = sctp_set_key("\x00\x00\x00\x01", 4); 2307 key2 = sctp_set_key("\x02", 1); 2308 expected_key = sctp_set_key("\x00\x00\x00\x01\x02", 5); 2309 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2310 failed++; 2311 2312 /* test case 3 */ 2313 key1 = sctp_set_key("\x01", 1); 2314 key2 = sctp_set_key("\x00\x00\x00\x02", 4); 2315 expected_key = sctp_set_key("\x01\x00\x00\x00\x02", 5); 2316 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2317 failed++; 2318 2319 /* test case 4 */ 2320 key1 = sctp_set_key("\x00\x00\x00\x01", 4); 2321 key2 = sctp_set_key("\x01", 1); 2322 expected_key = sctp_set_key("\x01\x00\x00\x00\x01", 5); 2323 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2324 failed++; 2325 2326 /* test case 5 */ 2327 key1 = sctp_set_key("\x01", 1); 2328 key2 = sctp_set_key("\x00\x00\x00\x01", 4); 2329 expected_key = sctp_set_key("\x01\x00\x00\x00\x01", 5); 2330 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2331 failed++; 2332 2333 /* test case 6 */ 2334 key1 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07", 11); 2335 key2 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 11); 2336 expected_key = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 22); 2337 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2338 failed++; 2339 2340 /* test case 7 */ 2341 key1 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 11); 2342 key2 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07", 11); 2343 expected_key = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 22); 2344 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2345 failed++; 2346 2347 /* done with all tests */ 2348 if (failed) 2349 printf("\nKey concatenation test results: %d cases failed", failed); 2350 else 2351 printf("\nKey concatenation test results: all test cases passed"); 2352 } 2353 2354 2355 #if defined(STANDALONE_HMAC_TEST) 2356 int 2357 main(void) 2358 { 2359 sctp_test_hmac_sha1(); 2360 sctp_test_hmac_md5(); 2361 sctp_test_authkey(); 2362 } 2363 2364 #endif /* STANDALONE_HMAC_TEST */ 2365 2366 #endif /* SCTP_HMAC_TEST */ 2367