1 /*- 2 * Copyright (c) 2001-2008, by 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/sctp_sysctl.h> 40 #include <netinet/sctputil.h> 41 #include <netinet/sctp_indata.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_auth.h> 44 45 #ifdef SCTP_DEBUG 46 #define SCTP_AUTH_DEBUG (SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_AUTH1) 47 #define SCTP_AUTH_DEBUG2 (SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_AUTH2) 48 #endif /* SCTP_DEBUG */ 49 50 51 void 52 sctp_clear_chunklist(sctp_auth_chklist_t * chklist) 53 { 54 bzero(chklist, sizeof(*chklist)); 55 /* chklist->num_chunks = 0; */ 56 } 57 58 sctp_auth_chklist_t * 59 sctp_alloc_chunklist(void) 60 { 61 sctp_auth_chklist_t *chklist; 62 63 SCTP_MALLOC(chklist, sctp_auth_chklist_t *, sizeof(*chklist), 64 SCTP_M_AUTH_CL); 65 if (chklist == NULL) { 66 SCTPDBG(SCTP_DEBUG_AUTH1, "sctp_alloc_chunklist: failed to get memory!\n"); 67 } else { 68 sctp_clear_chunklist(chklist); 69 } 70 return (chklist); 71 } 72 73 void 74 sctp_free_chunklist(sctp_auth_chklist_t * list) 75 { 76 if (list != NULL) 77 SCTP_FREE(list, SCTP_M_AUTH_CL); 78 } 79 80 sctp_auth_chklist_t * 81 sctp_copy_chunklist(sctp_auth_chklist_t * list) 82 { 83 sctp_auth_chklist_t *new_list; 84 85 if (list == NULL) 86 return (NULL); 87 88 /* get a new list */ 89 new_list = sctp_alloc_chunklist(); 90 if (new_list == NULL) 91 return (NULL); 92 /* copy it */ 93 bcopy(list, new_list, sizeof(*new_list)); 94 95 return (new_list); 96 } 97 98 99 /* 100 * add a chunk to the required chunks list 101 */ 102 int 103 sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list) 104 { 105 if (list == NULL) 106 return (-1); 107 108 /* is chunk restricted? */ 109 if ((chunk == SCTP_INITIATION) || 110 (chunk == SCTP_INITIATION_ACK) || 111 (chunk == SCTP_SHUTDOWN_COMPLETE) || 112 (chunk == SCTP_AUTHENTICATION)) { 113 return (-1); 114 } 115 if (list->chunks[chunk] == 0) { 116 list->chunks[chunk] = 1; 117 list->num_chunks++; 118 SCTPDBG(SCTP_DEBUG_AUTH1, 119 "SCTP: added chunk %u (0x%02x) to Auth list\n", 120 chunk, chunk); 121 } 122 return (0); 123 } 124 125 /* 126 * delete a chunk from the required chunks list 127 */ 128 int 129 sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list) 130 { 131 if (list == NULL) 132 return (-1); 133 134 /* is chunk restricted? */ 135 if ((chunk == SCTP_ASCONF) || 136 (chunk == SCTP_ASCONF_ACK)) { 137 return (-1); 138 } 139 if (list->chunks[chunk] == 1) { 140 list->chunks[chunk] = 0; 141 list->num_chunks--; 142 SCTPDBG(SCTP_DEBUG_AUTH1, 143 "SCTP: deleted chunk %u (0x%02x) from Auth list\n", 144 chunk, chunk); 145 } 146 return (0); 147 } 148 149 size_t 150 sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list) 151 { 152 if (list == NULL) 153 return (0); 154 else 155 return (list->num_chunks); 156 } 157 158 /* 159 * set the default list of chunks requiring AUTH 160 */ 161 void 162 sctp_auth_set_default_chunks(sctp_auth_chklist_t * list) 163 { 164 (void)sctp_auth_add_chunk(SCTP_ASCONF, list); 165 (void)sctp_auth_add_chunk(SCTP_ASCONF_ACK, list); 166 } 167 168 /* 169 * return the current number and list of required chunks caller must 170 * guarantee ptr has space for up to 256 bytes 171 */ 172 int 173 sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr) 174 { 175 int i, count = 0; 176 177 if (list == NULL) 178 return (0); 179 180 for (i = 0; i < 256; i++) { 181 if (list->chunks[i] != 0) { 182 *ptr++ = i; 183 count++; 184 } 185 } 186 return (count); 187 } 188 189 int 190 sctp_pack_auth_chunks(const sctp_auth_chklist_t * list, uint8_t * ptr) 191 { 192 int i, size = 0; 193 194 if (list == NULL) 195 return (0); 196 197 if (list->num_chunks <= 32) { 198 /* just list them, one byte each */ 199 for (i = 0; i < 256; i++) { 200 if (list->chunks[i] != 0) { 201 *ptr++ = i; 202 size++; 203 } 204 } 205 } else { 206 int index, offset; 207 208 /* pack into a 32 byte bitfield */ 209 for (i = 0; i < 256; i++) { 210 if (list->chunks[i] != 0) { 211 index = i / 8; 212 offset = i % 8; 213 ptr[index] |= (1 << offset); 214 } 215 } 216 size = 32; 217 } 218 return (size); 219 } 220 221 int 222 sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks, 223 sctp_auth_chklist_t * list) 224 { 225 int i; 226 int size; 227 228 if (list == NULL) 229 return (0); 230 231 if (num_chunks <= 32) { 232 /* just pull them, one byte each */ 233 for (i = 0; i < num_chunks; i++) { 234 (void)sctp_auth_add_chunk(*ptr++, list); 235 } 236 size = num_chunks; 237 } else { 238 int index, offset; 239 240 /* unpack from a 32 byte bitfield */ 241 for (index = 0; index < 32; index++) { 242 for (offset = 0; offset < 8; offset++) { 243 if (ptr[index] & (1 << offset)) { 244 (void)sctp_auth_add_chunk((index * 8) + offset, list); 245 } 246 } 247 } 248 size = 32; 249 } 250 return (size); 251 } 252 253 254 /* 255 * allocate structure space for a key of length keylen 256 */ 257 sctp_key_t * 258 sctp_alloc_key(uint32_t keylen) 259 { 260 sctp_key_t *new_key; 261 262 SCTP_MALLOC(new_key, sctp_key_t *, sizeof(*new_key) + keylen, 263 SCTP_M_AUTH_KY); 264 if (new_key == NULL) { 265 /* out of memory */ 266 return (NULL); 267 } 268 new_key->keylen = keylen; 269 return (new_key); 270 } 271 272 void 273 sctp_free_key(sctp_key_t * key) 274 { 275 if (key != NULL) 276 SCTP_FREE(key, SCTP_M_AUTH_KY); 277 } 278 279 void 280 sctp_print_key(sctp_key_t * key, const char *str) 281 { 282 uint32_t i; 283 284 if (key == NULL) { 285 printf("%s: [Null key]\n", str); 286 return; 287 } 288 printf("%s: len %u, ", str, key->keylen); 289 if (key->keylen) { 290 for (i = 0; i < key->keylen; i++) 291 printf("%02x", key->key[i]); 292 printf("\n"); 293 } else { 294 printf("[Null key]\n"); 295 } 296 } 297 298 void 299 sctp_show_key(sctp_key_t * key, const char *str) 300 { 301 uint32_t i; 302 303 if (key == NULL) { 304 printf("%s: [Null key]\n", str); 305 return; 306 } 307 printf("%s: len %u, ", str, key->keylen); 308 if (key->keylen) { 309 for (i = 0; i < key->keylen; i++) 310 printf("%02x", key->key[i]); 311 printf("\n"); 312 } else { 313 printf("[Null key]\n"); 314 } 315 } 316 317 static uint32_t 318 sctp_get_keylen(sctp_key_t * key) 319 { 320 if (key != NULL) 321 return (key->keylen); 322 else 323 return (0); 324 } 325 326 /* 327 * generate a new random key of length 'keylen' 328 */ 329 sctp_key_t * 330 sctp_generate_random_key(uint32_t keylen) 331 { 332 sctp_key_t *new_key; 333 334 /* validate keylen */ 335 if (keylen > SCTP_AUTH_RANDOM_SIZE_MAX) 336 keylen = SCTP_AUTH_RANDOM_SIZE_MAX; 337 338 new_key = sctp_alloc_key(keylen); 339 if (new_key == NULL) { 340 /* out of memory */ 341 return (NULL); 342 } 343 SCTP_READ_RANDOM(new_key->key, keylen); 344 new_key->keylen = keylen; 345 return (new_key); 346 } 347 348 sctp_key_t * 349 sctp_set_key(uint8_t * key, uint32_t keylen) 350 { 351 sctp_key_t *new_key; 352 353 new_key = sctp_alloc_key(keylen); 354 if (new_key == NULL) { 355 /* out of memory */ 356 return (NULL); 357 } 358 bcopy(key, new_key->key, keylen); 359 return (new_key); 360 } 361 362 /*- 363 * given two keys of variable size, compute which key is "larger/smaller" 364 * returns: 1 if key1 > key2 365 * -1 if key1 < key2 366 * 0 if key1 = key2 367 */ 368 static int 369 sctp_compare_key(sctp_key_t * key1, sctp_key_t * key2) 370 { 371 uint32_t maxlen; 372 uint32_t i; 373 uint32_t key1len, key2len; 374 uint8_t *key_1, *key_2; 375 uint8_t temp[SCTP_AUTH_RANDOM_SIZE_MAX]; 376 377 /* sanity/length check */ 378 key1len = sctp_get_keylen(key1); 379 key2len = sctp_get_keylen(key2); 380 if ((key1len == 0) && (key2len == 0)) 381 return (0); 382 else if (key1len == 0) 383 return (-1); 384 else if (key2len == 0) 385 return (1); 386 387 if (key1len != key2len) { 388 if (key1len >= key2len) 389 maxlen = key1len; 390 else 391 maxlen = key2len; 392 bzero(temp, maxlen); 393 if (key1len < maxlen) { 394 /* prepend zeroes to key1 */ 395 bcopy(key1->key, temp + (maxlen - key1len), key1len); 396 key_1 = temp; 397 key_2 = key2->key; 398 } else { 399 /* prepend zeroes to key2 */ 400 bcopy(key2->key, temp + (maxlen - key2len), key2len); 401 key_1 = key1->key; 402 key_2 = temp; 403 } 404 } else { 405 maxlen = key1len; 406 key_1 = key1->key; 407 key_2 = key2->key; 408 } 409 410 for (i = 0; i < maxlen; i++) { 411 if (*key_1 > *key_2) 412 return (1); 413 else if (*key_1 < *key_2) 414 return (-1); 415 key_1++; 416 key_2++; 417 } 418 419 /* keys are equal value, so check lengths */ 420 if (key1len == key2len) 421 return (0); 422 else if (key1len < key2len) 423 return (-1); 424 else 425 return (1); 426 } 427 428 /* 429 * generate the concatenated keying material based on the two keys and the 430 * shared key (if available). draft-ietf-tsvwg-auth specifies the specific 431 * order for concatenation 432 */ 433 sctp_key_t * 434 sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2, sctp_key_t * shared) 435 { 436 uint32_t keylen; 437 sctp_key_t *new_key; 438 uint8_t *key_ptr; 439 440 keylen = sctp_get_keylen(key1) + sctp_get_keylen(key2) + 441 sctp_get_keylen(shared); 442 443 if (keylen > 0) { 444 /* get space for the new key */ 445 new_key = sctp_alloc_key(keylen); 446 if (new_key == NULL) { 447 /* out of memory */ 448 return (NULL); 449 } 450 new_key->keylen = keylen; 451 key_ptr = new_key->key; 452 } else { 453 /* all keys empty/null?! */ 454 return (NULL); 455 } 456 457 /* concatenate the keys */ 458 if (sctp_compare_key(key1, key2) <= 0) { 459 #ifdef SCTP_AUTH_DRAFT_04 460 /* key is key1 + shared + key2 */ 461 if (sctp_get_keylen(key1)) { 462 bcopy(key1->key, key_ptr, key1->keylen); 463 key_ptr += key1->keylen; 464 } 465 if (sctp_get_keylen(shared)) { 466 bcopy(shared->key, key_ptr, shared->keylen); 467 key_ptr += shared->keylen; 468 } 469 if (sctp_get_keylen(key2)) { 470 bcopy(key2->key, key_ptr, key2->keylen); 471 key_ptr += key2->keylen; 472 } 473 #else 474 /* key is shared + key1 + key2 */ 475 if (sctp_get_keylen(shared)) { 476 bcopy(shared->key, key_ptr, shared->keylen); 477 key_ptr += shared->keylen; 478 } 479 if (sctp_get_keylen(key1)) { 480 bcopy(key1->key, key_ptr, key1->keylen); 481 key_ptr += key1->keylen; 482 } 483 if (sctp_get_keylen(key2)) { 484 bcopy(key2->key, key_ptr, key2->keylen); 485 key_ptr += key2->keylen; 486 } 487 #endif 488 } else { 489 #ifdef SCTP_AUTH_DRAFT_04 490 /* key is key2 + shared + key1 */ 491 if (sctp_get_keylen(key2)) { 492 bcopy(key2->key, key_ptr, key2->keylen); 493 key_ptr += key2->keylen; 494 } 495 if (sctp_get_keylen(shared)) { 496 bcopy(shared->key, key_ptr, shared->keylen); 497 key_ptr += shared->keylen; 498 } 499 if (sctp_get_keylen(key1)) { 500 bcopy(key1->key, key_ptr, key1->keylen); 501 key_ptr += key1->keylen; 502 } 503 #else 504 /* key is shared + key2 + key1 */ 505 if (sctp_get_keylen(shared)) { 506 bcopy(shared->key, key_ptr, shared->keylen); 507 key_ptr += shared->keylen; 508 } 509 if (sctp_get_keylen(key2)) { 510 bcopy(key2->key, key_ptr, key2->keylen); 511 key_ptr += key2->keylen; 512 } 513 if (sctp_get_keylen(key1)) { 514 bcopy(key1->key, key_ptr, key1->keylen); 515 key_ptr += key1->keylen; 516 } 517 #endif 518 } 519 return (new_key); 520 } 521 522 523 sctp_sharedkey_t * 524 sctp_alloc_sharedkey(void) 525 { 526 sctp_sharedkey_t *new_key; 527 528 SCTP_MALLOC(new_key, sctp_sharedkey_t *, sizeof(*new_key), 529 SCTP_M_AUTH_KY); 530 if (new_key == NULL) { 531 /* out of memory */ 532 return (NULL); 533 } 534 new_key->keyid = 0; 535 new_key->key = NULL; 536 new_key->refcount = 1; 537 new_key->deactivated = 0; 538 return (new_key); 539 } 540 541 void 542 sctp_free_sharedkey(sctp_sharedkey_t * skey) 543 { 544 if (skey == NULL) 545 return; 546 547 if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&skey->refcount)) { 548 if (skey->key != NULL) 549 sctp_free_key(skey->key); 550 SCTP_FREE(skey, SCTP_M_AUTH_KY); 551 } 552 } 553 554 sctp_sharedkey_t * 555 sctp_find_sharedkey(struct sctp_keyhead *shared_keys, uint16_t key_id) 556 { 557 sctp_sharedkey_t *skey; 558 559 LIST_FOREACH(skey, shared_keys, next) { 560 if (skey->keyid == key_id) 561 return (skey); 562 } 563 return (NULL); 564 } 565 566 int 567 sctp_insert_sharedkey(struct sctp_keyhead *shared_keys, 568 sctp_sharedkey_t * new_skey) 569 { 570 sctp_sharedkey_t *skey; 571 572 if ((shared_keys == NULL) || (new_skey == NULL)) 573 return (EINVAL); 574 575 /* insert into an empty list? */ 576 if (SCTP_LIST_EMPTY(shared_keys)) { 577 LIST_INSERT_HEAD(shared_keys, new_skey, next); 578 return (0); 579 } 580 /* insert into the existing list, ordered by key id */ 581 LIST_FOREACH(skey, shared_keys, next) { 582 if (new_skey->keyid < skey->keyid) { 583 /* insert it before here */ 584 LIST_INSERT_BEFORE(skey, new_skey, next); 585 return (0); 586 } else if (new_skey->keyid == skey->keyid) { 587 /* replace the existing key */ 588 /* verify this key *can* be replaced */ 589 if ((skey->deactivated) && (skey->refcount > 1)) { 590 SCTPDBG(SCTP_DEBUG_AUTH1, 591 "can't replace shared key id %u\n", 592 new_skey->keyid); 593 return (EBUSY); 594 } 595 SCTPDBG(SCTP_DEBUG_AUTH1, 596 "replacing shared key id %u\n", 597 new_skey->keyid); 598 LIST_INSERT_BEFORE(skey, new_skey, next); 599 LIST_REMOVE(skey, next); 600 sctp_free_sharedkey(skey); 601 return (0); 602 } 603 if (LIST_NEXT(skey, next) == NULL) { 604 /* belongs at the end of the list */ 605 LIST_INSERT_AFTER(skey, new_skey, next); 606 return (0); 607 } 608 } 609 /* shouldn't reach here */ 610 return (0); 611 } 612 613 void 614 sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t key_id) 615 { 616 sctp_sharedkey_t *skey; 617 618 /* find the shared key */ 619 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, key_id); 620 621 /* bump the ref count */ 622 if (skey) { 623 atomic_add_int(&skey->refcount, 1); 624 SCTPDBG(SCTP_DEBUG_AUTH2, 625 "%s: stcb %p key %u refcount acquire to %d\n", 626 __FUNCTION__, stcb, key_id, skey->refcount); 627 } 628 } 629 630 void 631 sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t key_id) 632 { 633 sctp_sharedkey_t *skey; 634 635 /* find the shared key */ 636 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, key_id); 637 638 /* decrement the ref count */ 639 if (skey) { 640 sctp_free_sharedkey(skey); 641 SCTPDBG(SCTP_DEBUG_AUTH2, 642 "%s: stcb %p key %u refcount release to %d\n", 643 __FUNCTION__, stcb, key_id, skey->refcount); 644 645 /* see if a notification should be generated */ 646 if ((skey->refcount <= 1) && (skey->deactivated)) { 647 /* notify ULP that key is no longer used */ 648 sctp_ulp_notify(SCTP_NOTIFY_AUTH_FREE_KEY, stcb, 649 key_id, 0, SCTP_SO_NOT_LOCKED); 650 SCTPDBG(SCTP_DEBUG_AUTH2, 651 "%s: stcb %p key %u no longer used, %d\n", 652 __FUNCTION__, stcb, key_id, skey->refcount); 653 } 654 } 655 } 656 657 static sctp_sharedkey_t * 658 sctp_copy_sharedkey(const sctp_sharedkey_t * skey) 659 { 660 sctp_sharedkey_t *new_skey; 661 662 if (skey == NULL) 663 return (NULL); 664 new_skey = sctp_alloc_sharedkey(); 665 if (new_skey == NULL) 666 return (NULL); 667 if (skey->key != NULL) 668 new_skey->key = sctp_set_key(skey->key->key, skey->key->keylen); 669 else 670 new_skey->key = NULL; 671 new_skey->keyid = skey->keyid; 672 return (new_skey); 673 } 674 675 int 676 sctp_copy_skeylist(const struct sctp_keyhead *src, struct sctp_keyhead *dest) 677 { 678 sctp_sharedkey_t *skey, *new_skey; 679 int count = 0; 680 681 if ((src == NULL) || (dest == NULL)) 682 return (0); 683 LIST_FOREACH(skey, src, next) { 684 new_skey = sctp_copy_sharedkey(skey); 685 if (new_skey != NULL) { 686 (void)sctp_insert_sharedkey(dest, new_skey); 687 count++; 688 } 689 } 690 return (count); 691 } 692 693 694 sctp_hmaclist_t * 695 sctp_alloc_hmaclist(uint8_t num_hmacs) 696 { 697 sctp_hmaclist_t *new_list; 698 int alloc_size; 699 700 alloc_size = sizeof(*new_list) + num_hmacs * sizeof(new_list->hmac[0]); 701 SCTP_MALLOC(new_list, sctp_hmaclist_t *, alloc_size, 702 SCTP_M_AUTH_HL); 703 if (new_list == NULL) { 704 /* out of memory */ 705 return (NULL); 706 } 707 new_list->max_algo = num_hmacs; 708 new_list->num_algo = 0; 709 return (new_list); 710 } 711 712 void 713 sctp_free_hmaclist(sctp_hmaclist_t * list) 714 { 715 if (list != NULL) { 716 SCTP_FREE(list, SCTP_M_AUTH_HL); 717 list = NULL; 718 } 719 } 720 721 int 722 sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id) 723 { 724 int i; 725 726 if (list == NULL) 727 return (-1); 728 if (list->num_algo == list->max_algo) { 729 SCTPDBG(SCTP_DEBUG_AUTH1, 730 "SCTP: HMAC id list full, ignoring add %u\n", hmac_id); 731 return (-1); 732 } 733 if ((hmac_id != SCTP_AUTH_HMAC_ID_SHA1) && 734 #ifdef HAVE_SHA224 735 (hmac_id != SCTP_AUTH_HMAC_ID_SHA224) && 736 #endif 737 #ifdef HAVE_SHA2 738 (hmac_id != SCTP_AUTH_HMAC_ID_SHA256) && 739 (hmac_id != SCTP_AUTH_HMAC_ID_SHA384) && 740 (hmac_id != SCTP_AUTH_HMAC_ID_SHA512) && 741 #endif 742 (hmac_id != SCTP_AUTH_HMAC_ID_MD5)) { 743 return (-1); 744 } 745 /* Now is it already in the list */ 746 for (i = 0; i < list->num_algo; i++) { 747 if (list->hmac[i] == hmac_id) { 748 /* already in list */ 749 return (-1); 750 } 751 } 752 SCTPDBG(SCTP_DEBUG_AUTH1, "SCTP: add HMAC id %u to list\n", hmac_id); 753 list->hmac[list->num_algo++] = hmac_id; 754 return (0); 755 } 756 757 sctp_hmaclist_t * 758 sctp_copy_hmaclist(sctp_hmaclist_t * list) 759 { 760 sctp_hmaclist_t *new_list; 761 int i; 762 763 if (list == NULL) 764 return (NULL); 765 /* get a new list */ 766 new_list = sctp_alloc_hmaclist(list->max_algo); 767 if (new_list == NULL) 768 return (NULL); 769 /* copy it */ 770 new_list->max_algo = list->max_algo; 771 new_list->num_algo = list->num_algo; 772 for (i = 0; i < list->num_algo; i++) 773 new_list->hmac[i] = list->hmac[i]; 774 return (new_list); 775 } 776 777 sctp_hmaclist_t * 778 sctp_default_supported_hmaclist(void) 779 { 780 sctp_hmaclist_t *new_list; 781 782 new_list = sctp_alloc_hmaclist(2); 783 if (new_list == NULL) 784 return (NULL); 785 (void)sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA1); 786 (void)sctp_auth_add_hmacid(new_list, SCTP_AUTH_HMAC_ID_SHA256); 787 return (new_list); 788 } 789 790 /*- 791 * HMAC algos are listed in priority/preference order 792 * find the best HMAC id to use for the peer based on local support 793 */ 794 uint16_t 795 sctp_negotiate_hmacid(sctp_hmaclist_t * peer, sctp_hmaclist_t * local) 796 { 797 int i, j; 798 799 if ((local == NULL) || (peer == NULL)) 800 return (SCTP_AUTH_HMAC_ID_RSVD); 801 802 for (i = 0; i < peer->num_algo; i++) { 803 for (j = 0; j < local->num_algo; j++) { 804 if (peer->hmac[i] == local->hmac[j]) { 805 #ifndef SCTP_AUTH_DRAFT_04 806 /* "skip" MD5 as it's been deprecated */ 807 if (peer->hmac[i] == SCTP_AUTH_HMAC_ID_MD5) 808 continue; 809 #endif 810 811 /* found the "best" one */ 812 SCTPDBG(SCTP_DEBUG_AUTH1, 813 "SCTP: negotiated peer HMAC id %u\n", 814 peer->hmac[i]); 815 return (peer->hmac[i]); 816 } 817 } 818 } 819 /* didn't find one! */ 820 return (SCTP_AUTH_HMAC_ID_RSVD); 821 } 822 823 /*- 824 * serialize the HMAC algo list and return space used 825 * caller must guarantee ptr has appropriate space 826 */ 827 int 828 sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr) 829 { 830 int i; 831 uint16_t hmac_id; 832 833 if (list == NULL) 834 return (0); 835 836 for (i = 0; i < list->num_algo; i++) { 837 hmac_id = htons(list->hmac[i]); 838 bcopy(&hmac_id, ptr, sizeof(hmac_id)); 839 ptr += sizeof(hmac_id); 840 } 841 return (list->num_algo * sizeof(hmac_id)); 842 } 843 844 int 845 sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs, uint32_t num_hmacs) 846 { 847 uint32_t i; 848 uint16_t hmac_id; 849 uint32_t sha1_supported = 0; 850 851 for (i = 0; i < num_hmacs; i++) { 852 hmac_id = ntohs(hmacs->hmac_ids[i]); 853 if (hmac_id == SCTP_AUTH_HMAC_ID_SHA1) 854 sha1_supported = 1; 855 } 856 /* all HMAC id's are supported */ 857 if (sha1_supported == 0) 858 return (-1); 859 else 860 return (0); 861 } 862 863 sctp_authinfo_t * 864 sctp_alloc_authinfo(void) 865 { 866 sctp_authinfo_t *new_authinfo; 867 868 SCTP_MALLOC(new_authinfo, sctp_authinfo_t *, sizeof(*new_authinfo), 869 SCTP_M_AUTH_IF); 870 871 if (new_authinfo == NULL) { 872 /* out of memory */ 873 return (NULL); 874 } 875 bzero(new_authinfo, sizeof(*new_authinfo)); 876 return (new_authinfo); 877 } 878 879 void 880 sctp_free_authinfo(sctp_authinfo_t * authinfo) 881 { 882 if (authinfo == NULL) 883 return; 884 885 if (authinfo->random != NULL) 886 sctp_free_key(authinfo->random); 887 if (authinfo->peer_random != NULL) 888 sctp_free_key(authinfo->peer_random); 889 if (authinfo->assoc_key != NULL) 890 sctp_free_key(authinfo->assoc_key); 891 if (authinfo->recv_key != NULL) 892 sctp_free_key(authinfo->recv_key); 893 894 /* We are NOT dynamically allocating authinfo's right now... */ 895 /* SCTP_FREE(authinfo, SCTP_M_AUTH_??); */ 896 } 897 898 899 uint32_t 900 sctp_get_auth_chunk_len(uint16_t hmac_algo) 901 { 902 int size; 903 904 size = sizeof(struct sctp_auth_chunk) + sctp_get_hmac_digest_len(hmac_algo); 905 return (SCTP_SIZE32(size)); 906 } 907 908 uint32_t 909 sctp_get_hmac_digest_len(uint16_t hmac_algo) 910 { 911 switch (hmac_algo) { 912 case SCTP_AUTH_HMAC_ID_SHA1: 913 return (SCTP_AUTH_DIGEST_LEN_SHA1); 914 case SCTP_AUTH_HMAC_ID_MD5: 915 return (SCTP_AUTH_DIGEST_LEN_MD5); 916 #ifdef HAVE_SHA224 917 case SCTP_AUTH_HMAC_ID_SHA224: 918 return (SCTP_AUTH_DIGEST_LEN_SHA224); 919 #endif 920 #ifdef HAVE_SHA2 921 case SCTP_AUTH_HMAC_ID_SHA256: 922 return (SCTP_AUTH_DIGEST_LEN_SHA256); 923 case SCTP_AUTH_HMAC_ID_SHA384: 924 return (SCTP_AUTH_DIGEST_LEN_SHA384); 925 case SCTP_AUTH_HMAC_ID_SHA512: 926 return (SCTP_AUTH_DIGEST_LEN_SHA512); 927 #endif 928 default: 929 /* unknown HMAC algorithm: can't do anything */ 930 return (0); 931 } /* end switch */ 932 } 933 934 static inline int 935 sctp_get_hmac_block_len(uint16_t hmac_algo) 936 { 937 switch (hmac_algo) { 938 case SCTP_AUTH_HMAC_ID_SHA1: 939 case SCTP_AUTH_HMAC_ID_MD5: 940 #ifdef HAVE_SHA224 941 case SCTP_AUTH_HMAC_ID_SHA224: 942 #endif 943 return (64); 944 #ifdef HAVE_SHA2 945 case SCTP_AUTH_HMAC_ID_SHA256: 946 return (64); 947 case SCTP_AUTH_HMAC_ID_SHA384: 948 case SCTP_AUTH_HMAC_ID_SHA512: 949 return (128); 950 #endif 951 case SCTP_AUTH_HMAC_ID_RSVD: 952 default: 953 /* unknown HMAC algorithm: can't do anything */ 954 return (0); 955 } /* end switch */ 956 } 957 958 static void 959 sctp_hmac_init(uint16_t hmac_algo, sctp_hash_context_t * ctx) 960 { 961 switch (hmac_algo) { 962 case SCTP_AUTH_HMAC_ID_SHA1: 963 SHA1_Init(&ctx->sha1); 964 break; 965 case SCTP_AUTH_HMAC_ID_MD5: 966 MD5_Init(&ctx->md5); 967 break; 968 #ifdef HAVE_SHA224 969 case SCTP_AUTH_HMAC_ID_SHA224: 970 break; 971 #endif 972 #ifdef HAVE_SHA2 973 case SCTP_AUTH_HMAC_ID_SHA256: 974 SHA256_Init(&ctx->sha256); 975 break; 976 case SCTP_AUTH_HMAC_ID_SHA384: 977 SHA384_Init(&ctx->sha384); 978 break; 979 case SCTP_AUTH_HMAC_ID_SHA512: 980 SHA512_Init(&ctx->sha512); 981 break; 982 #endif 983 case SCTP_AUTH_HMAC_ID_RSVD: 984 default: 985 /* unknown HMAC algorithm: can't do anything */ 986 return; 987 } /* end switch */ 988 } 989 990 static void 991 sctp_hmac_update(uint16_t hmac_algo, sctp_hash_context_t * ctx, 992 uint8_t * text, uint32_t textlen) 993 { 994 switch (hmac_algo) { 995 case SCTP_AUTH_HMAC_ID_SHA1: 996 SHA1_Update(&ctx->sha1, text, textlen); 997 break; 998 case SCTP_AUTH_HMAC_ID_MD5: 999 MD5_Update(&ctx->md5, text, textlen); 1000 break; 1001 #ifdef HAVE_SHA224 1002 case SCTP_AUTH_HMAC_ID_SHA224: 1003 break; 1004 #endif 1005 #ifdef HAVE_SHA2 1006 case SCTP_AUTH_HMAC_ID_SHA256: 1007 SHA256_Update(&ctx->sha256, text, textlen); 1008 break; 1009 case SCTP_AUTH_HMAC_ID_SHA384: 1010 SHA384_Update(&ctx->sha384, text, textlen); 1011 break; 1012 case SCTP_AUTH_HMAC_ID_SHA512: 1013 SHA512_Update(&ctx->sha512, text, textlen); 1014 break; 1015 #endif 1016 case SCTP_AUTH_HMAC_ID_RSVD: 1017 default: 1018 /* unknown HMAC algorithm: can't do anything */ 1019 return; 1020 } /* end switch */ 1021 } 1022 1023 static void 1024 sctp_hmac_final(uint16_t hmac_algo, sctp_hash_context_t * ctx, 1025 uint8_t * digest) 1026 { 1027 switch (hmac_algo) { 1028 case SCTP_AUTH_HMAC_ID_SHA1: 1029 SHA1_Final(digest, &ctx->sha1); 1030 break; 1031 case SCTP_AUTH_HMAC_ID_MD5: 1032 MD5_Final(digest, &ctx->md5); 1033 break; 1034 #ifdef HAVE_SHA224 1035 case SCTP_AUTH_HMAC_ID_SHA224: 1036 break; 1037 #endif 1038 #ifdef HAVE_SHA2 1039 case SCTP_AUTH_HMAC_ID_SHA256: 1040 SHA256_Final(digest, &ctx->sha256); 1041 break; 1042 case SCTP_AUTH_HMAC_ID_SHA384: 1043 /* SHA384 is truncated SHA512 */ 1044 SHA384_Final(digest, &ctx->sha384); 1045 break; 1046 case SCTP_AUTH_HMAC_ID_SHA512: 1047 SHA512_Final(digest, &ctx->sha512); 1048 break; 1049 #endif 1050 case SCTP_AUTH_HMAC_ID_RSVD: 1051 default: 1052 /* unknown HMAC algorithm: can't do anything */ 1053 return; 1054 } /* end switch */ 1055 } 1056 1057 /*- 1058 * Keyed-Hashing for Message Authentication: FIPS 198 (RFC 2104) 1059 * 1060 * Compute the HMAC digest using the desired hash key, text, and HMAC 1061 * algorithm. Resulting digest is placed in 'digest' and digest length 1062 * is returned, if the HMAC was performed. 1063 * 1064 * WARNING: it is up to the caller to supply sufficient space to hold the 1065 * resultant digest. 1066 */ 1067 uint32_t 1068 sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 1069 uint8_t * text, uint32_t textlen, uint8_t * digest) 1070 { 1071 uint32_t digestlen; 1072 uint32_t blocklen; 1073 sctp_hash_context_t ctx; 1074 uint8_t ipad[128], opad[128]; /* keyed hash inner/outer pads */ 1075 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1076 uint32_t i; 1077 1078 /* sanity check the material and length */ 1079 if ((key == NULL) || (keylen == 0) || (text == NULL) || 1080 (textlen == 0) || (digest == NULL)) { 1081 /* can't do HMAC with empty key or text or digest store */ 1082 return (0); 1083 } 1084 /* validate the hmac algo and get the digest length */ 1085 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1086 if (digestlen == 0) 1087 return (0); 1088 1089 /* hash the key if it is longer than the hash block size */ 1090 blocklen = sctp_get_hmac_block_len(hmac_algo); 1091 if (keylen > blocklen) { 1092 sctp_hmac_init(hmac_algo, &ctx); 1093 sctp_hmac_update(hmac_algo, &ctx, key, keylen); 1094 sctp_hmac_final(hmac_algo, &ctx, temp); 1095 /* set the hashed key as the key */ 1096 keylen = digestlen; 1097 key = temp; 1098 } 1099 /* initialize the inner/outer pads with the key and "append" zeroes */ 1100 bzero(ipad, blocklen); 1101 bzero(opad, blocklen); 1102 bcopy(key, ipad, keylen); 1103 bcopy(key, opad, keylen); 1104 1105 /* XOR the key with ipad and opad values */ 1106 for (i = 0; i < blocklen; i++) { 1107 ipad[i] ^= 0x36; 1108 opad[i] ^= 0x5c; 1109 } 1110 1111 /* perform inner hash */ 1112 sctp_hmac_init(hmac_algo, &ctx); 1113 sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen); 1114 sctp_hmac_update(hmac_algo, &ctx, text, textlen); 1115 sctp_hmac_final(hmac_algo, &ctx, temp); 1116 1117 /* perform outer hash */ 1118 sctp_hmac_init(hmac_algo, &ctx); 1119 sctp_hmac_update(hmac_algo, &ctx, opad, blocklen); 1120 sctp_hmac_update(hmac_algo, &ctx, temp, digestlen); 1121 sctp_hmac_final(hmac_algo, &ctx, digest); 1122 1123 return (digestlen); 1124 } 1125 1126 /* mbuf version */ 1127 uint32_t 1128 sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 1129 struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer) 1130 { 1131 uint32_t digestlen; 1132 uint32_t blocklen; 1133 sctp_hash_context_t ctx; 1134 uint8_t ipad[128], opad[128]; /* keyed hash inner/outer pads */ 1135 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1136 uint32_t i; 1137 struct mbuf *m_tmp; 1138 1139 /* sanity check the material and length */ 1140 if ((key == NULL) || (keylen == 0) || (m == NULL) || (digest == NULL)) { 1141 /* can't do HMAC with empty key or text or digest store */ 1142 return (0); 1143 } 1144 /* validate the hmac algo and get the digest length */ 1145 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1146 if (digestlen == 0) 1147 return (0); 1148 1149 /* hash the key if it is longer than the hash block size */ 1150 blocklen = sctp_get_hmac_block_len(hmac_algo); 1151 if (keylen > blocklen) { 1152 sctp_hmac_init(hmac_algo, &ctx); 1153 sctp_hmac_update(hmac_algo, &ctx, key, keylen); 1154 sctp_hmac_final(hmac_algo, &ctx, temp); 1155 /* set the hashed key as the key */ 1156 keylen = digestlen; 1157 key = temp; 1158 } 1159 /* initialize the inner/outer pads with the key and "append" zeroes */ 1160 bzero(ipad, blocklen); 1161 bzero(opad, blocklen); 1162 bcopy(key, ipad, keylen); 1163 bcopy(key, opad, keylen); 1164 1165 /* XOR the key with ipad and opad values */ 1166 for (i = 0; i < blocklen; i++) { 1167 ipad[i] ^= 0x36; 1168 opad[i] ^= 0x5c; 1169 } 1170 1171 /* perform inner hash */ 1172 sctp_hmac_init(hmac_algo, &ctx); 1173 sctp_hmac_update(hmac_algo, &ctx, ipad, blocklen); 1174 /* find the correct starting mbuf and offset (get start of text) */ 1175 m_tmp = m; 1176 while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) { 1177 m_offset -= SCTP_BUF_LEN(m_tmp); 1178 m_tmp = SCTP_BUF_NEXT(m_tmp); 1179 } 1180 /* now use the rest of the mbuf chain for the text */ 1181 while (m_tmp != NULL) { 1182 if ((SCTP_BUF_NEXT(m_tmp) == NULL) && trailer) { 1183 sctp_hmac_update(hmac_algo, &ctx, mtod(m_tmp, uint8_t *) + m_offset, 1184 SCTP_BUF_LEN(m_tmp) - (trailer + m_offset)); 1185 } else { 1186 sctp_hmac_update(hmac_algo, &ctx, mtod(m_tmp, uint8_t *) + m_offset, 1187 SCTP_BUF_LEN(m_tmp) - m_offset); 1188 } 1189 1190 /* clear the offset since it's only for the first mbuf */ 1191 m_offset = 0; 1192 m_tmp = SCTP_BUF_NEXT(m_tmp); 1193 } 1194 sctp_hmac_final(hmac_algo, &ctx, temp); 1195 1196 /* perform outer hash */ 1197 sctp_hmac_init(hmac_algo, &ctx); 1198 sctp_hmac_update(hmac_algo, &ctx, opad, blocklen); 1199 sctp_hmac_update(hmac_algo, &ctx, temp, digestlen); 1200 sctp_hmac_final(hmac_algo, &ctx, digest); 1201 1202 return (digestlen); 1203 } 1204 1205 /*- 1206 * verify the HMAC digest using the desired hash key, text, and HMAC 1207 * algorithm. 1208 * Returns -1 on error, 0 on success. 1209 */ 1210 int 1211 sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen, 1212 uint8_t * text, uint32_t textlen, 1213 uint8_t * digest, uint32_t digestlen) 1214 { 1215 uint32_t len; 1216 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1217 1218 /* sanity check the material and length */ 1219 if ((key == NULL) || (keylen == 0) || 1220 (text == NULL) || (textlen == 0) || (digest == NULL)) { 1221 /* can't do HMAC with empty key or text or digest */ 1222 return (-1); 1223 } 1224 len = sctp_get_hmac_digest_len(hmac_algo); 1225 if ((len == 0) || (digestlen != len)) 1226 return (-1); 1227 1228 /* compute the expected hash */ 1229 if (sctp_hmac(hmac_algo, key, keylen, text, textlen, temp) != len) 1230 return (-1); 1231 1232 if (memcmp(digest, temp, digestlen) != 0) 1233 return (-1); 1234 else 1235 return (0); 1236 } 1237 1238 1239 /* 1240 * computes the requested HMAC using a key struct (which may be modified if 1241 * the keylen exceeds the HMAC block len). 1242 */ 1243 uint32_t 1244 sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key, uint8_t * text, 1245 uint32_t textlen, uint8_t * digest) 1246 { 1247 uint32_t digestlen; 1248 uint32_t blocklen; 1249 sctp_hash_context_t ctx; 1250 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1251 1252 /* sanity check */ 1253 if ((key == NULL) || (text == NULL) || (textlen == 0) || 1254 (digest == NULL)) { 1255 /* can't do HMAC with empty key or text or digest store */ 1256 return (0); 1257 } 1258 /* validate the hmac algo and get the digest length */ 1259 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1260 if (digestlen == 0) 1261 return (0); 1262 1263 /* hash the key if it is longer than the hash block size */ 1264 blocklen = sctp_get_hmac_block_len(hmac_algo); 1265 if (key->keylen > blocklen) { 1266 sctp_hmac_init(hmac_algo, &ctx); 1267 sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen); 1268 sctp_hmac_final(hmac_algo, &ctx, temp); 1269 /* save the hashed key as the new key */ 1270 key->keylen = digestlen; 1271 bcopy(temp, key->key, key->keylen); 1272 } 1273 return (sctp_hmac(hmac_algo, key->key, key->keylen, text, textlen, 1274 digest)); 1275 } 1276 1277 /* mbuf version */ 1278 uint32_t 1279 sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key, struct mbuf *m, 1280 uint32_t m_offset, uint8_t * digest) 1281 { 1282 uint32_t digestlen; 1283 uint32_t blocklen; 1284 sctp_hash_context_t ctx; 1285 uint8_t temp[SCTP_AUTH_DIGEST_LEN_MAX]; 1286 1287 /* sanity check */ 1288 if ((key == NULL) || (m == NULL) || (digest == NULL)) { 1289 /* can't do HMAC with empty key or text or digest store */ 1290 return (0); 1291 } 1292 /* validate the hmac algo and get the digest length */ 1293 digestlen = sctp_get_hmac_digest_len(hmac_algo); 1294 if (digestlen == 0) 1295 return (0); 1296 1297 /* hash the key if it is longer than the hash block size */ 1298 blocklen = sctp_get_hmac_block_len(hmac_algo); 1299 if (key->keylen > blocklen) { 1300 sctp_hmac_init(hmac_algo, &ctx); 1301 sctp_hmac_update(hmac_algo, &ctx, key->key, key->keylen); 1302 sctp_hmac_final(hmac_algo, &ctx, temp); 1303 /* save the hashed key as the new key */ 1304 key->keylen = digestlen; 1305 bcopy(temp, key->key, key->keylen); 1306 } 1307 return (sctp_hmac_m(hmac_algo, key->key, key->keylen, m, m_offset, digest, 0)); 1308 } 1309 1310 int 1311 sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id) 1312 { 1313 int i; 1314 1315 if ((list == NULL) || (id == SCTP_AUTH_HMAC_ID_RSVD)) 1316 return (0); 1317 1318 for (i = 0; i < list->num_algo; i++) 1319 if (list->hmac[i] == id) 1320 return (1); 1321 1322 /* not in the list */ 1323 return (0); 1324 } 1325 1326 1327 /*- 1328 * clear any cached key(s) if they match the given key id on an association. 1329 * the cached key(s) will be recomputed and re-cached at next use. 1330 * ASSUMES TCB_LOCK is already held 1331 */ 1332 void 1333 sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid) 1334 { 1335 if (stcb == NULL) 1336 return; 1337 1338 if (keyid == stcb->asoc.authinfo.assoc_keyid) { 1339 sctp_free_key(stcb->asoc.authinfo.assoc_key); 1340 stcb->asoc.authinfo.assoc_key = NULL; 1341 } 1342 if (keyid == stcb->asoc.authinfo.recv_keyid) { 1343 sctp_free_key(stcb->asoc.authinfo.recv_key); 1344 stcb->asoc.authinfo.recv_key = NULL; 1345 } 1346 } 1347 1348 /*- 1349 * clear any cached key(s) if they match the given key id for all assocs on 1350 * an endpoint. 1351 * ASSUMES INP_WLOCK is already held 1352 */ 1353 void 1354 sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid) 1355 { 1356 struct sctp_tcb *stcb; 1357 1358 if (inp == NULL) 1359 return; 1360 1361 /* clear the cached keys on all assocs on this instance */ 1362 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 1363 SCTP_TCB_LOCK(stcb); 1364 sctp_clear_cachedkeys(stcb, keyid); 1365 SCTP_TCB_UNLOCK(stcb); 1366 } 1367 } 1368 1369 /*- 1370 * delete a shared key from an association 1371 * ASSUMES TCB_LOCK is already held 1372 */ 1373 int 1374 sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid) 1375 { 1376 sctp_sharedkey_t *skey; 1377 1378 if (stcb == NULL) 1379 return (-1); 1380 1381 /* is the keyid the assoc active sending key */ 1382 if (keyid == stcb->asoc.authinfo.active_keyid) 1383 return (-1); 1384 1385 /* does the key exist? */ 1386 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1387 if (skey == NULL) 1388 return (-1); 1389 1390 /* are there other refcount holders on the key? */ 1391 if (skey->refcount > 1) 1392 return (-1); 1393 1394 /* remove it */ 1395 LIST_REMOVE(skey, next); 1396 sctp_free_sharedkey(skey); /* frees skey->key as well */ 1397 1398 /* clear any cached keys */ 1399 sctp_clear_cachedkeys(stcb, keyid); 1400 return (0); 1401 } 1402 1403 /*- 1404 * deletes a shared key from the endpoint 1405 * ASSUMES INP_WLOCK is already held 1406 */ 1407 int 1408 sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid) 1409 { 1410 sctp_sharedkey_t *skey; 1411 1412 if (inp == NULL) 1413 return (-1); 1414 1415 /* is the keyid the active sending key on the endpoint */ 1416 if (keyid == inp->sctp_ep.default_keyid) 1417 return (-1); 1418 1419 /* does the key exist? */ 1420 skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid); 1421 if (skey == NULL) 1422 return (-1); 1423 1424 /* endpoint keys are not refcounted */ 1425 1426 /* remove it */ 1427 LIST_REMOVE(skey, next); 1428 sctp_free_sharedkey(skey); /* frees skey->key as well */ 1429 1430 /* clear any cached keys */ 1431 sctp_clear_cachedkeys_ep(inp, keyid); 1432 return (0); 1433 } 1434 1435 /*- 1436 * set the active key on an association 1437 * ASSUMES TCB_LOCK is already held 1438 */ 1439 int 1440 sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid) 1441 { 1442 sctp_sharedkey_t *skey = NULL; 1443 1444 /* find the key on the assoc */ 1445 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1446 if (skey == NULL) { 1447 /* that key doesn't exist */ 1448 return (-1); 1449 } 1450 if ((skey->deactivated) && (skey->refcount > 1)) { 1451 /* can't reactivate a deactivated key with other refcounts */ 1452 return (-1); 1453 } 1454 /* set the (new) active key */ 1455 stcb->asoc.authinfo.active_keyid = keyid; 1456 /* reset the deactivated flag */ 1457 skey->deactivated = 0; 1458 1459 return (0); 1460 } 1461 1462 /*- 1463 * set the active key on an endpoint 1464 * ASSUMES INP_WLOCK is already held 1465 */ 1466 int 1467 sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid) 1468 { 1469 sctp_sharedkey_t *skey; 1470 1471 /* find the key */ 1472 skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid); 1473 if (skey == NULL) { 1474 /* that key doesn't exist */ 1475 return (-1); 1476 } 1477 inp->sctp_ep.default_keyid = keyid; 1478 return (0); 1479 } 1480 1481 /*- 1482 * deactivates a shared key from the association 1483 * ASSUMES INP_WLOCK is already held 1484 */ 1485 int 1486 sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid) 1487 { 1488 sctp_sharedkey_t *skey; 1489 1490 if (stcb == NULL) 1491 return (-1); 1492 1493 /* is the keyid the assoc active sending key */ 1494 if (keyid == stcb->asoc.authinfo.active_keyid) 1495 return (-1); 1496 1497 /* does the key exist? */ 1498 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1499 if (skey == NULL) 1500 return (-1); 1501 1502 /* are there other refcount holders on the key? */ 1503 if (skey->refcount == 1) { 1504 /* no other users, send a notification for this key */ 1505 sctp_ulp_notify(SCTP_NOTIFY_AUTH_FREE_KEY, stcb, keyid, 0, 1506 SCTP_SO_LOCKED); 1507 } 1508 /* mark the key as deactivated */ 1509 skey->deactivated = 1; 1510 1511 return (0); 1512 } 1513 1514 /*- 1515 * deactivates a shared key from the endpoint 1516 * ASSUMES INP_WLOCK is already held 1517 */ 1518 int 1519 sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid) 1520 { 1521 sctp_sharedkey_t *skey; 1522 1523 if (inp == NULL) 1524 return (-1); 1525 1526 /* is the keyid the active sending key on the endpoint */ 1527 if (keyid == inp->sctp_ep.default_keyid) 1528 return (-1); 1529 1530 /* does the key exist? */ 1531 skey = sctp_find_sharedkey(&inp->sctp_ep.shared_keys, keyid); 1532 if (skey == NULL) 1533 return (-1); 1534 1535 /* endpoint keys are not refcounted */ 1536 1537 /* remove it */ 1538 LIST_REMOVE(skey, next); 1539 sctp_free_sharedkey(skey); /* frees skey->key as well */ 1540 1541 return (0); 1542 } 1543 1544 /* 1545 * get local authentication parameters from cookie (from INIT-ACK) 1546 */ 1547 void 1548 sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m, 1549 uint32_t offset, uint32_t length) 1550 { 1551 struct sctp_paramhdr *phdr, tmp_param; 1552 uint16_t plen, ptype; 1553 uint8_t random_store[SCTP_PARAM_BUFFER_SIZE]; 1554 struct sctp_auth_random *p_random = NULL; 1555 uint16_t random_len = 0; 1556 uint8_t hmacs_store[SCTP_PARAM_BUFFER_SIZE]; 1557 struct sctp_auth_hmac_algo *hmacs = NULL; 1558 uint16_t hmacs_len = 0; 1559 uint8_t chunks_store[SCTP_PARAM_BUFFER_SIZE]; 1560 struct sctp_auth_chunk_list *chunks = NULL; 1561 uint16_t num_chunks = 0; 1562 sctp_key_t *new_key; 1563 uint32_t keylen; 1564 1565 /* convert to upper bound */ 1566 length += offset; 1567 1568 phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, 1569 sizeof(struct sctp_paramhdr), (uint8_t *) & tmp_param); 1570 while (phdr != NULL) { 1571 ptype = ntohs(phdr->param_type); 1572 plen = ntohs(phdr->param_length); 1573 1574 if ((plen == 0) || (offset + plen > length)) 1575 break; 1576 1577 if (ptype == SCTP_RANDOM) { 1578 if (plen > sizeof(random_store)) 1579 break; 1580 phdr = sctp_get_next_param(m, offset, 1581 (struct sctp_paramhdr *)random_store, min(plen, sizeof(random_store))); 1582 if (phdr == NULL) 1583 return; 1584 /* save the random and length for the key */ 1585 p_random = (struct sctp_auth_random *)phdr; 1586 random_len = plen - sizeof(*p_random); 1587 } else if (ptype == SCTP_HMAC_LIST) { 1588 int num_hmacs; 1589 int i; 1590 1591 if (plen > sizeof(hmacs_store)) 1592 break; 1593 phdr = sctp_get_next_param(m, offset, 1594 (struct sctp_paramhdr *)hmacs_store, min(plen, sizeof(hmacs_store))); 1595 if (phdr == NULL) 1596 return; 1597 /* save the hmacs list and num for the key */ 1598 hmacs = (struct sctp_auth_hmac_algo *)phdr; 1599 hmacs_len = plen - sizeof(*hmacs); 1600 num_hmacs = hmacs_len / sizeof(hmacs->hmac_ids[0]); 1601 if (stcb->asoc.local_hmacs != NULL) 1602 sctp_free_hmaclist(stcb->asoc.local_hmacs); 1603 stcb->asoc.local_hmacs = sctp_alloc_hmaclist(num_hmacs); 1604 if (stcb->asoc.local_hmacs != NULL) { 1605 for (i = 0; i < num_hmacs; i++) { 1606 (void)sctp_auth_add_hmacid(stcb->asoc.local_hmacs, 1607 ntohs(hmacs->hmac_ids[i])); 1608 } 1609 } 1610 } else if (ptype == SCTP_CHUNK_LIST) { 1611 int i; 1612 1613 if (plen > sizeof(chunks_store)) 1614 break; 1615 phdr = sctp_get_next_param(m, offset, 1616 (struct sctp_paramhdr *)chunks_store, min(plen, sizeof(chunks_store))); 1617 if (phdr == NULL) 1618 return; 1619 chunks = (struct sctp_auth_chunk_list *)phdr; 1620 num_chunks = plen - sizeof(*chunks); 1621 /* save chunks list and num for the key */ 1622 if (stcb->asoc.local_auth_chunks != NULL) 1623 sctp_clear_chunklist(stcb->asoc.local_auth_chunks); 1624 else 1625 stcb->asoc.local_auth_chunks = sctp_alloc_chunklist(); 1626 for (i = 0; i < num_chunks; i++) { 1627 (void)sctp_auth_add_chunk(chunks->chunk_types[i], 1628 stcb->asoc.local_auth_chunks); 1629 } 1630 } 1631 /* get next parameter */ 1632 offset += SCTP_SIZE32(plen); 1633 if (offset + sizeof(struct sctp_paramhdr) > length) 1634 break; 1635 phdr = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), 1636 (uint8_t *) & tmp_param); 1637 } 1638 /* concatenate the full random key */ 1639 #ifdef SCTP_AUTH_DRAFT_04 1640 keylen = random_len; 1641 new_key = sctp_alloc_key(keylen); 1642 if (new_key != NULL) { 1643 /* copy in the RANDOM */ 1644 if (p_random != NULL) 1645 bcopy(p_random->random_data, new_key->key, random_len); 1646 } 1647 #else 1648 keylen = sizeof(*p_random) + random_len + sizeof(*hmacs) + hmacs_len; 1649 if (chunks != NULL) { 1650 keylen += sizeof(*chunks) + num_chunks; 1651 } 1652 new_key = sctp_alloc_key(keylen); 1653 if (new_key != NULL) { 1654 /* copy in the RANDOM */ 1655 if (p_random != NULL) { 1656 keylen = sizeof(*p_random) + random_len; 1657 bcopy(p_random, new_key->key, keylen); 1658 } 1659 /* append in the AUTH chunks */ 1660 if (chunks != NULL) { 1661 bcopy(chunks, new_key->key + keylen, 1662 sizeof(*chunks) + num_chunks); 1663 keylen += sizeof(*chunks) + num_chunks; 1664 } 1665 /* append in the HMACs */ 1666 if (hmacs != NULL) { 1667 bcopy(hmacs, new_key->key + keylen, 1668 sizeof(*hmacs) + hmacs_len); 1669 } 1670 } 1671 #endif 1672 if (stcb->asoc.authinfo.random != NULL) 1673 sctp_free_key(stcb->asoc.authinfo.random); 1674 stcb->asoc.authinfo.random = new_key; 1675 stcb->asoc.authinfo.random_len = random_len; 1676 #ifdef SCTP_AUTH_DRAFT_04 1677 /* don't include the chunks and hmacs for draft -04 */ 1678 stcb->asoc.authinfo.random->keylen = random_len; 1679 #endif 1680 sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.assoc_keyid); 1681 sctp_clear_cachedkeys(stcb, stcb->asoc.authinfo.recv_keyid); 1682 1683 /* negotiate what HMAC to use for the peer */ 1684 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 1685 stcb->asoc.local_hmacs); 1686 1687 /* copy defaults from the endpoint */ 1688 /* FIX ME: put in cookie? */ 1689 stcb->asoc.authinfo.active_keyid = stcb->sctp_ep->sctp_ep.default_keyid; 1690 /* copy out the shared key list (by reference) from the endpoint */ 1691 (void)sctp_copy_skeylist(&stcb->sctp_ep->sctp_ep.shared_keys, 1692 &stcb->asoc.shared_keys); 1693 } 1694 1695 /* 1696 * compute and fill in the HMAC digest for a packet 1697 */ 1698 void 1699 sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset, 1700 struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t keyid) 1701 { 1702 uint32_t digestlen; 1703 sctp_sharedkey_t *skey; 1704 sctp_key_t *key; 1705 1706 if ((stcb == NULL) || (auth == NULL)) 1707 return; 1708 1709 /* zero the digest + chunk padding */ 1710 digestlen = sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id); 1711 bzero(auth->hmac, SCTP_SIZE32(digestlen)); 1712 1713 /* is the desired key cached? */ 1714 if ((keyid != stcb->asoc.authinfo.assoc_keyid) || 1715 (stcb->asoc.authinfo.assoc_key == NULL)) { 1716 if (stcb->asoc.authinfo.assoc_key != NULL) { 1717 /* free the old cached key */ 1718 sctp_free_key(stcb->asoc.authinfo.assoc_key); 1719 } 1720 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, keyid); 1721 /* the only way skey is NULL is if null key id 0 is used */ 1722 if (skey != NULL) 1723 key = skey->key; 1724 else 1725 key = NULL; 1726 /* compute a new assoc key and cache it */ 1727 stcb->asoc.authinfo.assoc_key = 1728 sctp_compute_hashkey(stcb->asoc.authinfo.random, 1729 stcb->asoc.authinfo.peer_random, key); 1730 stcb->asoc.authinfo.assoc_keyid = keyid; 1731 SCTPDBG(SCTP_DEBUG_AUTH1, "caching key id %u\n", 1732 stcb->asoc.authinfo.assoc_keyid); 1733 #ifdef SCTP_DEBUG 1734 if (SCTP_AUTH_DEBUG) 1735 sctp_print_key(stcb->asoc.authinfo.assoc_key, 1736 "Assoc Key"); 1737 #endif 1738 } 1739 /* set in the active key id */ 1740 auth->shared_key_id = htons(keyid); 1741 1742 /* compute and fill in the digest */ 1743 (void)sctp_compute_hmac_m(stcb->asoc.peer_hmac_id, stcb->asoc.authinfo.assoc_key, 1744 m, auth_offset, auth->hmac); 1745 } 1746 1747 1748 static void 1749 sctp_bzero_m(struct mbuf *m, uint32_t m_offset, uint32_t size) 1750 { 1751 struct mbuf *m_tmp; 1752 uint8_t *data; 1753 1754 /* sanity check */ 1755 if (m == NULL) 1756 return; 1757 1758 /* find the correct starting mbuf and offset (get start position) */ 1759 m_tmp = m; 1760 while ((m_tmp != NULL) && (m_offset >= (uint32_t) SCTP_BUF_LEN(m_tmp))) { 1761 m_offset -= SCTP_BUF_LEN(m_tmp); 1762 m_tmp = SCTP_BUF_NEXT(m_tmp); 1763 } 1764 /* now use the rest of the mbuf chain */ 1765 while ((m_tmp != NULL) && (size > 0)) { 1766 data = mtod(m_tmp, uint8_t *) + m_offset; 1767 if (size > (uint32_t) SCTP_BUF_LEN(m_tmp)) { 1768 bzero(data, SCTP_BUF_LEN(m_tmp)); 1769 size -= SCTP_BUF_LEN(m_tmp); 1770 } else { 1771 bzero(data, size); 1772 size = 0; 1773 } 1774 /* clear the offset since it's only for the first mbuf */ 1775 m_offset = 0; 1776 m_tmp = SCTP_BUF_NEXT(m_tmp); 1777 } 1778 } 1779 1780 /*- 1781 * process the incoming Authentication chunk 1782 * return codes: 1783 * -1 on any authentication error 1784 * 0 on authentication verification 1785 */ 1786 int 1787 sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *auth, 1788 struct mbuf *m, uint32_t offset) 1789 { 1790 uint16_t chunklen; 1791 uint16_t shared_key_id; 1792 uint16_t hmac_id; 1793 sctp_sharedkey_t *skey; 1794 uint32_t digestlen; 1795 uint8_t digest[SCTP_AUTH_DIGEST_LEN_MAX]; 1796 uint8_t computed_digest[SCTP_AUTH_DIGEST_LEN_MAX]; 1797 1798 /* auth is checked for NULL by caller */ 1799 chunklen = ntohs(auth->ch.chunk_length); 1800 if (chunklen < sizeof(*auth)) { 1801 SCTP_STAT_INCR(sctps_recvauthfailed); 1802 return (-1); 1803 } 1804 SCTP_STAT_INCR(sctps_recvauth); 1805 1806 /* get the auth params */ 1807 shared_key_id = ntohs(auth->shared_key_id); 1808 hmac_id = ntohs(auth->hmac_id); 1809 SCTPDBG(SCTP_DEBUG_AUTH1, 1810 "SCTP AUTH Chunk: shared key %u, HMAC id %u\n", 1811 shared_key_id, hmac_id); 1812 1813 /* is the indicated HMAC supported? */ 1814 if (!sctp_auth_is_supported_hmac(stcb->asoc.local_hmacs, hmac_id)) { 1815 struct mbuf *m_err; 1816 struct sctp_auth_invalid_hmac *err; 1817 1818 SCTP_STAT_INCR(sctps_recvivalhmacid); 1819 SCTPDBG(SCTP_DEBUG_AUTH1, 1820 "SCTP Auth: unsupported HMAC id %u\n", 1821 hmac_id); 1822 /* 1823 * report this in an Error Chunk: Unsupported HMAC 1824 * Identifier 1825 */ 1826 m_err = sctp_get_mbuf_for_msg(sizeof(*err), 0, M_DONTWAIT, 1827 1, MT_HEADER); 1828 if (m_err != NULL) { 1829 /* pre-reserve some space */ 1830 SCTP_BUF_RESV_UF(m_err, sizeof(struct sctp_chunkhdr)); 1831 /* fill in the error */ 1832 err = mtod(m_err, struct sctp_auth_invalid_hmac *); 1833 bzero(err, sizeof(*err)); 1834 err->ph.param_type = htons(SCTP_CAUSE_UNSUPPORTED_HMACID); 1835 err->ph.param_length = htons(sizeof(*err)); 1836 err->hmac_id = ntohs(hmac_id); 1837 SCTP_BUF_LEN(m_err) = sizeof(*err); 1838 /* queue it */ 1839 sctp_queue_op_err(stcb, m_err); 1840 } 1841 return (-1); 1842 } 1843 /* get the indicated shared key, if available */ 1844 if ((stcb->asoc.authinfo.recv_key == NULL) || 1845 (stcb->asoc.authinfo.recv_keyid != shared_key_id)) { 1846 /* find the shared key on the assoc first */ 1847 skey = sctp_find_sharedkey(&stcb->asoc.shared_keys, 1848 shared_key_id); 1849 /* if the shared key isn't found, discard the chunk */ 1850 if (skey == NULL) { 1851 SCTP_STAT_INCR(sctps_recvivalkeyid); 1852 SCTPDBG(SCTP_DEBUG_AUTH1, 1853 "SCTP Auth: unknown key id %u\n", 1854 shared_key_id); 1855 return (-1); 1856 } 1857 /* generate a notification if this is a new key id */ 1858 if (stcb->asoc.authinfo.recv_keyid != shared_key_id) 1859 /* 1860 * sctp_ulp_notify(SCTP_NOTIFY_AUTH_NEW_KEY, stcb, 1861 * shared_key_id, (void 1862 * *)stcb->asoc.authinfo.recv_keyid); 1863 */ 1864 sctp_notify_authentication(stcb, SCTP_AUTH_NEWKEY, 1865 shared_key_id, stcb->asoc.authinfo.recv_keyid, 1866 SCTP_SO_NOT_LOCKED); 1867 /* compute a new recv assoc key and cache it */ 1868 if (stcb->asoc.authinfo.recv_key != NULL) 1869 sctp_free_key(stcb->asoc.authinfo.recv_key); 1870 stcb->asoc.authinfo.recv_key = 1871 sctp_compute_hashkey(stcb->asoc.authinfo.random, 1872 stcb->asoc.authinfo.peer_random, skey->key); 1873 stcb->asoc.authinfo.recv_keyid = shared_key_id; 1874 #ifdef SCTP_DEBUG 1875 if (SCTP_AUTH_DEBUG) 1876 sctp_print_key(stcb->asoc.authinfo.recv_key, "Recv Key"); 1877 #endif 1878 } 1879 /* validate the digest length */ 1880 digestlen = sctp_get_hmac_digest_len(hmac_id); 1881 if (chunklen < (sizeof(*auth) + digestlen)) { 1882 /* invalid digest length */ 1883 SCTP_STAT_INCR(sctps_recvauthfailed); 1884 SCTPDBG(SCTP_DEBUG_AUTH1, 1885 "SCTP Auth: chunk too short for HMAC\n"); 1886 return (-1); 1887 } 1888 /* save a copy of the digest, zero the pseudo header, and validate */ 1889 bcopy(auth->hmac, digest, digestlen); 1890 sctp_bzero_m(m, offset + sizeof(*auth), SCTP_SIZE32(digestlen)); 1891 (void)sctp_compute_hmac_m(hmac_id, stcb->asoc.authinfo.recv_key, 1892 m, offset, computed_digest); 1893 1894 /* compare the computed digest with the one in the AUTH chunk */ 1895 if (memcmp(digest, computed_digest, digestlen) != 0) { 1896 SCTP_STAT_INCR(sctps_recvauthfailed); 1897 SCTPDBG(SCTP_DEBUG_AUTH1, 1898 "SCTP Auth: HMAC digest check failed\n"); 1899 return (-1); 1900 } 1901 return (0); 1902 } 1903 1904 /* 1905 * Generate NOTIFICATION 1906 */ 1907 void 1908 sctp_notify_authentication(struct sctp_tcb *stcb, uint32_t indication, 1909 uint16_t keyid, uint16_t alt_keyid, int so_locked 1910 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 1911 SCTP_UNUSED 1912 #endif 1913 ) 1914 { 1915 struct mbuf *m_notify; 1916 struct sctp_authkey_event *auth; 1917 struct sctp_queued_to_read *control; 1918 1919 if ((stcb == NULL) || 1920 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 1921 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 1922 (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) 1923 ) { 1924 /* If the socket is gone we are out of here */ 1925 return; 1926 } 1927 if (sctp_is_feature_off(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTHEVNT)) 1928 /* event not enabled */ 1929 return; 1930 1931 m_notify = sctp_get_mbuf_for_msg(sizeof(struct sctp_authkey_event), 1932 0, M_DONTWAIT, 1, MT_HEADER); 1933 if (m_notify == NULL) 1934 /* no space left */ 1935 return; 1936 1937 SCTP_BUF_LEN(m_notify) = 0; 1938 auth = mtod(m_notify, struct sctp_authkey_event *); 1939 auth->auth_type = SCTP_AUTHENTICATION_EVENT; 1940 auth->auth_flags = 0; 1941 auth->auth_length = sizeof(*auth); 1942 auth->auth_keynumber = keyid; 1943 auth->auth_altkeynumber = alt_keyid; 1944 auth->auth_indication = indication; 1945 auth->auth_assoc_id = sctp_get_associd(stcb); 1946 1947 SCTP_BUF_LEN(m_notify) = sizeof(*auth); 1948 SCTP_BUF_NEXT(m_notify) = NULL; 1949 1950 /* append to socket */ 1951 control = sctp_build_readq_entry(stcb, stcb->asoc.primary_destination, 1952 0, 0, 0, 0, 0, 0, m_notify); 1953 if (control == NULL) { 1954 /* no memory */ 1955 sctp_m_freem(m_notify); 1956 return; 1957 } 1958 control->spec_flags = M_NOTIFICATION; 1959 control->length = SCTP_BUF_LEN(m_notify); 1960 /* not that we need this */ 1961 control->tail_mbuf = m_notify; 1962 sctp_add_to_readq(stcb->sctp_ep, stcb, control, 1963 &stcb->sctp_socket->so_rcv, 1, so_locked); 1964 } 1965 1966 1967 /*- 1968 * validates the AUTHentication related parameters in an INIT/INIT-ACK 1969 * Note: currently only used for INIT as INIT-ACK is handled inline 1970 * with sctp_load_addresses_from_init() 1971 */ 1972 int 1973 sctp_validate_init_auth_params(struct mbuf *m, int offset, int limit) 1974 { 1975 struct sctp_paramhdr *phdr, parm_buf; 1976 uint16_t ptype, plen; 1977 int peer_supports_asconf = 0; 1978 int peer_supports_auth = 0; 1979 int got_random = 0, got_hmacs = 0, got_chklist = 0; 1980 uint8_t saw_asconf = 0; 1981 uint8_t saw_asconf_ack = 0; 1982 1983 /* go through each of the params. */ 1984 phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf)); 1985 while (phdr) { 1986 ptype = ntohs(phdr->param_type); 1987 plen = ntohs(phdr->param_length); 1988 1989 if (offset + plen > limit) { 1990 break; 1991 } 1992 if (plen < sizeof(struct sctp_paramhdr)) { 1993 break; 1994 } 1995 if (ptype == SCTP_SUPPORTED_CHUNK_EXT) { 1996 /* A supported extension chunk */ 1997 struct sctp_supported_chunk_types_param *pr_supported; 1998 uint8_t local_store[SCTP_PARAM_BUFFER_SIZE]; 1999 int num_ent, i; 2000 2001 phdr = sctp_get_next_param(m, offset, 2002 (struct sctp_paramhdr *)&local_store, min(plen, sizeof(local_store))); 2003 if (phdr == NULL) { 2004 return (-1); 2005 } 2006 pr_supported = (struct sctp_supported_chunk_types_param *)phdr; 2007 num_ent = plen - sizeof(struct sctp_paramhdr); 2008 for (i = 0; i < num_ent; i++) { 2009 switch (pr_supported->chunk_types[i]) { 2010 case SCTP_ASCONF: 2011 case SCTP_ASCONF_ACK: 2012 peer_supports_asconf = 1; 2013 break; 2014 case SCTP_AUTHENTICATION: 2015 peer_supports_auth = 1; 2016 break; 2017 default: 2018 /* one we don't care about */ 2019 break; 2020 } 2021 } 2022 } else if (ptype == SCTP_RANDOM) { 2023 got_random = 1; 2024 /* enforce the random length */ 2025 if (plen != (sizeof(struct sctp_auth_random) + 2026 SCTP_AUTH_RANDOM_SIZE_REQUIRED)) { 2027 SCTPDBG(SCTP_DEBUG_AUTH1, 2028 "SCTP: invalid RANDOM len\n"); 2029 return (-1); 2030 } 2031 } else if (ptype == SCTP_HMAC_LIST) { 2032 uint8_t store[SCTP_PARAM_BUFFER_SIZE]; 2033 struct sctp_auth_hmac_algo *hmacs; 2034 int num_hmacs; 2035 2036 if (plen > sizeof(store)) 2037 break; 2038 phdr = sctp_get_next_param(m, offset, 2039 (struct sctp_paramhdr *)store, min(plen, sizeof(store))); 2040 if (phdr == NULL) 2041 return (-1); 2042 hmacs = (struct sctp_auth_hmac_algo *)phdr; 2043 num_hmacs = (plen - sizeof(*hmacs)) / 2044 sizeof(hmacs->hmac_ids[0]); 2045 /* validate the hmac list */ 2046 if (sctp_verify_hmac_param(hmacs, num_hmacs)) { 2047 SCTPDBG(SCTP_DEBUG_AUTH1, 2048 "SCTP: invalid HMAC param\n"); 2049 return (-1); 2050 } 2051 got_hmacs = 1; 2052 } else if (ptype == SCTP_CHUNK_LIST) { 2053 int i, num_chunks; 2054 uint8_t chunks_store[SCTP_SMALL_CHUNK_STORE]; 2055 2056 /* did the peer send a non-empty chunk list? */ 2057 struct sctp_auth_chunk_list *chunks = NULL; 2058 2059 phdr = sctp_get_next_param(m, offset, 2060 (struct sctp_paramhdr *)chunks_store, 2061 min(plen, sizeof(chunks_store))); 2062 if (phdr == NULL) 2063 return (-1); 2064 2065 /*- 2066 * Flip through the list and mark that the 2067 * peer supports asconf/asconf_ack. 2068 */ 2069 chunks = (struct sctp_auth_chunk_list *)phdr; 2070 num_chunks = plen - sizeof(*chunks); 2071 for (i = 0; i < num_chunks; i++) { 2072 /* record asconf/asconf-ack if listed */ 2073 if (chunks->chunk_types[i] == SCTP_ASCONF) 2074 saw_asconf = 1; 2075 if (chunks->chunk_types[i] == SCTP_ASCONF_ACK) 2076 saw_asconf_ack = 1; 2077 2078 } 2079 if (num_chunks) 2080 got_chklist = 1; 2081 } 2082 offset += SCTP_SIZE32(plen); 2083 if (offset >= limit) { 2084 break; 2085 } 2086 phdr = sctp_get_next_param(m, offset, &parm_buf, 2087 sizeof(parm_buf)); 2088 } 2089 /* validate authentication required parameters */ 2090 if (got_random && got_hmacs) { 2091 peer_supports_auth = 1; 2092 } else { 2093 peer_supports_auth = 0; 2094 } 2095 if (!peer_supports_auth && got_chklist) { 2096 SCTPDBG(SCTP_DEBUG_AUTH1, 2097 "SCTP: peer sent chunk list w/o AUTH\n"); 2098 return (-1); 2099 } 2100 if (!SCTP_BASE_SYSCTL(sctp_asconf_auth_nochk) && peer_supports_asconf && 2101 !peer_supports_auth) { 2102 SCTPDBG(SCTP_DEBUG_AUTH1, 2103 "SCTP: peer supports ASCONF but not AUTH\n"); 2104 return (-1); 2105 } else if ((peer_supports_asconf) && (peer_supports_auth) && 2106 ((saw_asconf == 0) || (saw_asconf_ack == 0))) { 2107 return (-2); 2108 } 2109 return (0); 2110 } 2111 2112 void 2113 sctp_initialize_auth_params(struct sctp_inpcb *inp, struct sctp_tcb *stcb) 2114 { 2115 uint16_t chunks_len = 0; 2116 uint16_t hmacs_len = 0; 2117 uint16_t random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT; 2118 sctp_key_t *new_key; 2119 uint16_t keylen; 2120 2121 /* initialize hmac list from endpoint */ 2122 stcb->asoc.local_hmacs = sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 2123 if (stcb->asoc.local_hmacs != NULL) { 2124 hmacs_len = stcb->asoc.local_hmacs->num_algo * 2125 sizeof(stcb->asoc.local_hmacs->hmac[0]); 2126 } 2127 /* initialize auth chunks list from endpoint */ 2128 stcb->asoc.local_auth_chunks = 2129 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 2130 if (stcb->asoc.local_auth_chunks != NULL) { 2131 int i; 2132 2133 for (i = 0; i < 256; i++) { 2134 if (stcb->asoc.local_auth_chunks->chunks[i]) 2135 chunks_len++; 2136 } 2137 } 2138 /* copy defaults from the endpoint */ 2139 stcb->asoc.authinfo.active_keyid = inp->sctp_ep.default_keyid; 2140 2141 /* copy out the shared key list (by reference) from the endpoint */ 2142 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 2143 &stcb->asoc.shared_keys); 2144 2145 /* now set the concatenated key (random + chunks + hmacs) */ 2146 #ifdef SCTP_AUTH_DRAFT_04 2147 /* don't include the chunks and hmacs for draft -04 */ 2148 keylen = random_len; 2149 new_key = sctp_generate_random_key(keylen); 2150 #else 2151 /* key includes parameter headers */ 2152 keylen = (3 * sizeof(struct sctp_paramhdr)) + random_len + chunks_len + 2153 hmacs_len; 2154 new_key = sctp_alloc_key(keylen); 2155 if (new_key != NULL) { 2156 struct sctp_paramhdr *ph; 2157 int plen; 2158 2159 /* generate and copy in the RANDOM */ 2160 ph = (struct sctp_paramhdr *)new_key->key; 2161 ph->param_type = htons(SCTP_RANDOM); 2162 plen = sizeof(*ph) + random_len; 2163 ph->param_length = htons(plen); 2164 SCTP_READ_RANDOM(new_key->key + sizeof(*ph), random_len); 2165 keylen = plen; 2166 2167 /* append in the AUTH chunks */ 2168 /* NOTE: currently we always have chunks to list */ 2169 ph = (struct sctp_paramhdr *)(new_key->key + keylen); 2170 ph->param_type = htons(SCTP_CHUNK_LIST); 2171 plen = sizeof(*ph) + chunks_len; 2172 ph->param_length = htons(plen); 2173 keylen += sizeof(*ph); 2174 if (stcb->asoc.local_auth_chunks) { 2175 int i; 2176 2177 for (i = 0; i < 256; i++) { 2178 if (stcb->asoc.local_auth_chunks->chunks[i]) 2179 new_key->key[keylen++] = i; 2180 } 2181 } 2182 /* append in the HMACs */ 2183 ph = (struct sctp_paramhdr *)(new_key->key + keylen); 2184 ph->param_type = htons(SCTP_HMAC_LIST); 2185 plen = sizeof(*ph) + hmacs_len; 2186 ph->param_length = htons(plen); 2187 keylen += sizeof(*ph); 2188 (void)sctp_serialize_hmaclist(stcb->asoc.local_hmacs, 2189 new_key->key + keylen); 2190 } 2191 #endif 2192 if (stcb->asoc.authinfo.random != NULL) 2193 sctp_free_key(stcb->asoc.authinfo.random); 2194 stcb->asoc.authinfo.random = new_key; 2195 stcb->asoc.authinfo.random_len = random_len; 2196 } 2197 2198 2199 #ifdef SCTP_HMAC_TEST 2200 /* 2201 * HMAC and key concatenation tests 2202 */ 2203 static void 2204 sctp_print_digest(uint8_t * digest, uint32_t digestlen, const char *str) 2205 { 2206 uint32_t i; 2207 2208 printf("\n%s: 0x", str); 2209 if (digest == NULL) 2210 return; 2211 2212 for (i = 0; i < digestlen; i++) 2213 printf("%02x", digest[i]); 2214 } 2215 2216 static int 2217 sctp_test_hmac(const char *str, uint16_t hmac_id, uint8_t * key, 2218 uint32_t keylen, uint8_t * text, uint32_t textlen, 2219 uint8_t * digest, uint32_t digestlen) 2220 { 2221 uint8_t computed_digest[SCTP_AUTH_DIGEST_LEN_MAX]; 2222 2223 printf("\n%s:", str); 2224 sctp_hmac(hmac_id, key, keylen, text, textlen, computed_digest); 2225 sctp_print_digest(digest, digestlen, "Expected digest"); 2226 sctp_print_digest(computed_digest, digestlen, "Computed digest"); 2227 if (memcmp(digest, computed_digest, digestlen) != 0) { 2228 printf("\nFAILED"); 2229 return (-1); 2230 } else { 2231 printf("\nPASSED"); 2232 return (0); 2233 } 2234 } 2235 2236 2237 /* 2238 * RFC 2202: HMAC-SHA1 test cases 2239 */ 2240 void 2241 sctp_test_hmac_sha1(void) 2242 { 2243 uint8_t *digest; 2244 uint8_t key[128]; 2245 uint32_t keylen; 2246 uint8_t text[128]; 2247 uint32_t textlen; 2248 uint32_t digestlen = 20; 2249 int failed = 0; 2250 2251 /*- 2252 * test_case = 1 2253 * key = 0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b 2254 * key_len = 20 2255 * data = "Hi There" 2256 * data_len = 8 2257 * digest = 0xb617318655057264e28bc0b6fb378c8ef146be00 2258 */ 2259 keylen = 20; 2260 memset(key, 0x0b, keylen); 2261 textlen = 8; 2262 strcpy(text, "Hi There"); 2263 digest = "\xb6\x17\x31\x86\x55\x05\x72\x64\xe2\x8b\xc0\xb6\xfb\x37\x8c\x8e\xf1\x46\xbe\x00"; 2264 if (sctp_test_hmac("SHA1 test case 1", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2265 text, textlen, digest, digestlen) < 0) 2266 failed++; 2267 2268 /*- 2269 * test_case = 2 2270 * key = "Jefe" 2271 * key_len = 4 2272 * data = "what do ya want for nothing?" 2273 * data_len = 28 2274 * digest = 0xeffcdf6ae5eb2fa2d27416d5f184df9c259a7c79 2275 */ 2276 keylen = 4; 2277 strcpy(key, "Jefe"); 2278 textlen = 28; 2279 strcpy(text, "what do ya want for nothing?"); 2280 digest = "\xef\xfc\xdf\x6a\xe5\xeb\x2f\xa2\xd2\x74\x16\xd5\xf1\x84\xdf\x9c\x25\x9a\x7c\x79"; 2281 if (sctp_test_hmac("SHA1 test case 2", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2282 text, textlen, digest, digestlen) < 0) 2283 failed++; 2284 2285 /*- 2286 * test_case = 3 2287 * key = 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 2288 * key_len = 20 2289 * data = 0xdd repeated 50 times 2290 * data_len = 50 2291 * digest = 0x125d7342b9ac11cd91a39af48aa17b4f63f175d3 2292 */ 2293 keylen = 20; 2294 memset(key, 0xaa, keylen); 2295 textlen = 50; 2296 memset(text, 0xdd, textlen); 2297 digest = "\x12\x5d\x73\x42\xb9\xac\x11\xcd\x91\xa3\x9a\xf4\x8a\xa1\x7b\x4f\x63\xf1\x75\xd3"; 2298 if (sctp_test_hmac("SHA1 test case 3", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2299 text, textlen, digest, digestlen) < 0) 2300 failed++; 2301 2302 /*- 2303 * test_case = 4 2304 * key = 0x0102030405060708090a0b0c0d0e0f10111213141516171819 2305 * key_len = 25 2306 * data = 0xcd repeated 50 times 2307 * data_len = 50 2308 * digest = 0x4c9007f4026250c6bc8414f9bf50c86c2d7235da 2309 */ 2310 keylen = 25; 2311 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); 2312 textlen = 50; 2313 memset(text, 0xcd, textlen); 2314 digest = "\x4c\x90\x07\xf4\x02\x62\x50\xc6\xbc\x84\x14\xf9\xbf\x50\xc8\x6c\x2d\x72\x35\xda"; 2315 if (sctp_test_hmac("SHA1 test case 4", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2316 text, textlen, digest, digestlen) < 0) 2317 failed++; 2318 2319 /*- 2320 * test_case = 5 2321 * key = 0x0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c 2322 * key_len = 20 2323 * data = "Test With Truncation" 2324 * data_len = 20 2325 * digest = 0x4c1a03424b55e07fe7f27be1d58bb9324a9a5a04 2326 * digest-96 = 0x4c1a03424b55e07fe7f27be1 2327 */ 2328 keylen = 20; 2329 memset(key, 0x0c, keylen); 2330 textlen = 20; 2331 strcpy(text, "Test With Truncation"); 2332 digest = "\x4c\x1a\x03\x42\x4b\x55\xe0\x7f\xe7\xf2\x7b\xe1\xd5\x8b\xb9\x32\x4a\x9a\x5a\x04"; 2333 if (sctp_test_hmac("SHA1 test case 5", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2334 text, textlen, digest, digestlen) < 0) 2335 failed++; 2336 2337 /*- 2338 * test_case = 6 2339 * key = 0xaa repeated 80 times 2340 * key_len = 80 2341 * data = "Test Using Larger Than Block-Size Key - Hash Key First" 2342 * data_len = 54 2343 * digest = 0xaa4ae5e15272d00e95705637ce8a3b55ed402112 2344 */ 2345 keylen = 80; 2346 memset(key, 0xaa, keylen); 2347 textlen = 54; 2348 strcpy(text, "Test Using Larger Than Block-Size Key - Hash Key First"); 2349 digest = "\xaa\x4a\xe5\xe1\x52\x72\xd0\x0e\x95\x70\x56\x37\xce\x8a\x3b\x55\xed\x40\x21\x12"; 2350 if (sctp_test_hmac("SHA1 test case 6", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2351 text, textlen, digest, digestlen) < 0) 2352 failed++; 2353 2354 /*- 2355 * test_case = 7 2356 * key = 0xaa repeated 80 times 2357 * key_len = 80 2358 * data = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data" 2359 * data_len = 73 2360 * digest = 0xe8e99d0f45237d786d6bbaa7965c7808bbff1a91 2361 */ 2362 keylen = 80; 2363 memset(key, 0xaa, keylen); 2364 textlen = 73; 2365 strcpy(text, "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"); 2366 digest = "\xe8\xe9\x9d\x0f\x45\x23\x7d\x78\x6d\x6b\xba\xa7\x96\x5c\x78\x08\xbb\xff\x1a\x91"; 2367 if (sctp_test_hmac("SHA1 test case 7", SCTP_AUTH_HMAC_ID_SHA1, key, keylen, 2368 text, textlen, digest, digestlen) < 0) 2369 failed++; 2370 2371 /* done with all tests */ 2372 if (failed) 2373 printf("\nSHA1 test results: %d cases failed", failed); 2374 else 2375 printf("\nSHA1 test results: all test cases passed"); 2376 } 2377 2378 /* 2379 * RFC 2202: HMAC-MD5 test cases 2380 */ 2381 void 2382 sctp_test_hmac_md5(void) 2383 { 2384 uint8_t *digest; 2385 uint8_t key[128]; 2386 uint32_t keylen; 2387 uint8_t text[128]; 2388 uint32_t textlen; 2389 uint32_t digestlen = 16; 2390 int failed = 0; 2391 2392 /*- 2393 * test_case = 1 2394 * key = 0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b 2395 * key_len = 16 2396 * data = "Hi There" 2397 * data_len = 8 2398 * digest = 0x9294727a3638bb1c13f48ef8158bfc9d 2399 */ 2400 keylen = 16; 2401 memset(key, 0x0b, keylen); 2402 textlen = 8; 2403 strcpy(text, "Hi There"); 2404 digest = "\x92\x94\x72\x7a\x36\x38\xbb\x1c\x13\xf4\x8e\xf8\x15\x8b\xfc\x9d"; 2405 if (sctp_test_hmac("MD5 test case 1", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2406 text, textlen, digest, digestlen) < 0) 2407 failed++; 2408 2409 /*- 2410 * test_case = 2 2411 * key = "Jefe" 2412 * key_len = 4 2413 * data = "what do ya want for nothing?" 2414 * data_len = 28 2415 * digest = 0x750c783e6ab0b503eaa86e310a5db738 2416 */ 2417 keylen = 4; 2418 strcpy(key, "Jefe"); 2419 textlen = 28; 2420 strcpy(text, "what do ya want for nothing?"); 2421 digest = "\x75\x0c\x78\x3e\x6a\xb0\xb5\x03\xea\xa8\x6e\x31\x0a\x5d\xb7\x38"; 2422 if (sctp_test_hmac("MD5 test case 2", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2423 text, textlen, digest, digestlen) < 0) 2424 failed++; 2425 2426 /*- 2427 * test_case = 3 2428 * key = 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 2429 * key_len = 16 2430 * data = 0xdd repeated 50 times 2431 * data_len = 50 2432 * digest = 0x56be34521d144c88dbb8c733f0e8b3f6 2433 */ 2434 keylen = 16; 2435 memset(key, 0xaa, keylen); 2436 textlen = 50; 2437 memset(text, 0xdd, textlen); 2438 digest = "\x56\xbe\x34\x52\x1d\x14\x4c\x88\xdb\xb8\xc7\x33\xf0\xe8\xb3\xf6"; 2439 if (sctp_test_hmac("MD5 test case 3", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2440 text, textlen, digest, digestlen) < 0) 2441 failed++; 2442 2443 /*- 2444 * test_case = 4 2445 * key = 0x0102030405060708090a0b0c0d0e0f10111213141516171819 2446 * key_len = 25 2447 * data = 0xcd repeated 50 times 2448 * data_len = 50 2449 * digest = 0x697eaf0aca3a3aea3a75164746ffaa79 2450 */ 2451 keylen = 25; 2452 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); 2453 textlen = 50; 2454 memset(text, 0xcd, textlen); 2455 digest = "\x69\x7e\xaf\x0a\xca\x3a\x3a\xea\x3a\x75\x16\x47\x46\xff\xaa\x79"; 2456 if (sctp_test_hmac("MD5 test case 4", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2457 text, textlen, digest, digestlen) < 0) 2458 failed++; 2459 2460 /*- 2461 * test_case = 5 2462 * key = 0x0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c 2463 * key_len = 16 2464 * data = "Test With Truncation" 2465 * data_len = 20 2466 * digest = 0x56461ef2342edc00f9bab995690efd4c 2467 * digest-96 = 0x56461ef2342edc00f9bab995 2468 */ 2469 keylen = 16; 2470 memset(key, 0x0c, keylen); 2471 textlen = 20; 2472 strcpy(text, "Test With Truncation"); 2473 digest = "\x56\x46\x1e\xf2\x34\x2e\xdc\x00\xf9\xba\xb9\x95\x69\x0e\xfd\x4c"; 2474 if (sctp_test_hmac("MD5 test case 5", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2475 text, textlen, digest, digestlen) < 0) 2476 failed++; 2477 2478 /*- 2479 * test_case = 6 2480 * key = 0xaa repeated 80 times 2481 * key_len = 80 2482 * data = "Test Using Larger Than Block-Size Key - Hash Key First" 2483 * data_len = 54 2484 * digest = 0x6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd 2485 */ 2486 keylen = 80; 2487 memset(key, 0xaa, keylen); 2488 textlen = 54; 2489 strcpy(text, "Test Using Larger Than Block-Size Key - Hash Key First"); 2490 digest = "\x6b\x1a\xb7\xfe\x4b\xd7\xbf\x8f\x0b\x62\xe6\xce\x61\xb9\xd0\xcd"; 2491 if (sctp_test_hmac("MD5 test case 6", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2492 text, textlen, digest, digestlen) < 0) 2493 failed++; 2494 2495 /*- 2496 * test_case = 7 2497 * key = 0xaa repeated 80 times 2498 * key_len = 80 2499 * data = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data" 2500 * data_len = 73 2501 * digest = 0x6f630fad67cda0ee1fb1f562db3aa53e 2502 */ 2503 keylen = 80; 2504 memset(key, 0xaa, keylen); 2505 textlen = 73; 2506 strcpy(text, "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"); 2507 digest = "\x6f\x63\x0f\xad\x67\xcd\xa0\xee\x1f\xb1\xf5\x62\xdb\x3a\xa5\x3e"; 2508 if (sctp_test_hmac("MD5 test case 7", SCTP_AUTH_HMAC_ID_MD5, key, keylen, 2509 text, textlen, digest, digestlen) < 0) 2510 failed++; 2511 2512 /* done with all tests */ 2513 if (failed) 2514 printf("\nMD5 test results: %d cases failed", failed); 2515 else 2516 printf("\nMD5 test results: all test cases passed"); 2517 } 2518 2519 /* 2520 * test assoc key concatenation 2521 */ 2522 static int 2523 sctp_test_key_concatenation(sctp_key_t * key1, sctp_key_t * key2, 2524 sctp_key_t * expected_key) 2525 { 2526 sctp_key_t *key; 2527 int ret_val; 2528 2529 sctp_show_key(key1, "\nkey1"); 2530 sctp_show_key(key2, "\nkey2"); 2531 key = sctp_compute_hashkey(key1, key2, NULL); 2532 sctp_show_key(expected_key, "\nExpected"); 2533 sctp_show_key(key, "\nComputed"); 2534 if (memcmp(key, expected_key, expected_key->keylen) != 0) { 2535 printf("\nFAILED"); 2536 ret_val = -1; 2537 } else { 2538 printf("\nPASSED"); 2539 ret_val = 0; 2540 } 2541 sctp_free_key(key1); 2542 sctp_free_key(key2); 2543 sctp_free_key(expected_key); 2544 sctp_free_key(key); 2545 return (ret_val); 2546 } 2547 2548 2549 void 2550 sctp_test_authkey(void) 2551 { 2552 sctp_key_t *key1, *key2, *expected_key; 2553 int failed = 0; 2554 2555 /* test case 1 */ 2556 key1 = sctp_set_key("\x01\x01\x01\x01", 4); 2557 key2 = sctp_set_key("\x01\x02\x03\x04", 4); 2558 expected_key = sctp_set_key("\x01\x01\x01\x01\x01\x02\x03\x04", 8); 2559 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2560 failed++; 2561 2562 /* test case 2 */ 2563 key1 = sctp_set_key("\x00\x00\x00\x01", 4); 2564 key2 = sctp_set_key("\x02", 1); 2565 expected_key = sctp_set_key("\x00\x00\x00\x01\x02", 5); 2566 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2567 failed++; 2568 2569 /* test case 3 */ 2570 key1 = sctp_set_key("\x01", 1); 2571 key2 = sctp_set_key("\x00\x00\x00\x02", 4); 2572 expected_key = sctp_set_key("\x01\x00\x00\x00\x02", 5); 2573 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2574 failed++; 2575 2576 /* test case 4 */ 2577 key1 = sctp_set_key("\x00\x00\x00\x01", 4); 2578 key2 = sctp_set_key("\x01", 1); 2579 expected_key = sctp_set_key("\x01\x00\x00\x00\x01", 5); 2580 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2581 failed++; 2582 2583 /* test case 5 */ 2584 key1 = sctp_set_key("\x01", 1); 2585 key2 = sctp_set_key("\x00\x00\x00\x01", 4); 2586 expected_key = sctp_set_key("\x01\x00\x00\x00\x01", 5); 2587 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2588 failed++; 2589 2590 /* test case 6 */ 2591 key1 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07", 11); 2592 key2 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 11); 2593 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); 2594 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2595 failed++; 2596 2597 /* test case 7 */ 2598 key1 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x08", 11); 2599 key2 = sctp_set_key("\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07", 11); 2600 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); 2601 if (sctp_test_key_concatenation(key1, key2, expected_key) < 0) 2602 failed++; 2603 2604 /* done with all tests */ 2605 if (failed) 2606 printf("\nKey concatenation test results: %d cases failed", failed); 2607 else 2608 printf("\nKey concatenation test results: all test cases passed"); 2609 } 2610 2611 2612 #if defined(STANDALONE_HMAC_TEST) 2613 int 2614 main(void) 2615 { 2616 sctp_test_hmac_sha1(); 2617 sctp_test_hmac_md5(); 2618 sctp_test_authkey(); 2619 } 2620 2621 #endif /* STANDALONE_HMAC_TEST */ 2622 2623 #endif /* SCTP_HMAC_TEST */ 2624