nsec3.c revision 1.15
1 /* $NetBSD: nsec3.c,v 1.15 2025/05/21 14:48:03 christos Exp $ */ 2 3 /* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16 #include <inttypes.h> 17 #include <stdbool.h> 18 19 #include <isc/base32.h> 20 #include <isc/buffer.h> 21 #include <isc/hex.h> 22 #include <isc/iterated_hash.h> 23 #include <isc/md.h> 24 #include <isc/nonce.h> 25 #include <isc/result.h> 26 #include <isc/safe.h> 27 #include <isc/string.h> 28 #include <isc/util.h> 29 30 #include <dns/compress.h> 31 #include <dns/db.h> 32 #include <dns/dbiterator.h> 33 #include <dns/diff.h> 34 #include <dns/fixedname.h> 35 #include <dns/nsec.h> 36 #include <dns/nsec3.h> 37 #include <dns/rdata.h> 38 #include <dns/rdatalist.h> 39 #include <dns/rdataset.h> 40 #include <dns/rdatasetiter.h> 41 #include <dns/rdatastruct.h> 42 #include <dns/zone.h> 43 44 #include <dst/dst.h> 45 46 #define CHECK(x) \ 47 do { \ 48 result = (x); \ 49 if (result != ISC_R_SUCCESS) \ 50 goto failure; \ 51 } while (0) 52 53 #define OPTOUT(x) (((x) & DNS_NSEC3FLAG_OPTOUT) != 0) 54 #define CREATE(x) (((x) & DNS_NSEC3FLAG_CREATE) != 0) 55 #define INITIAL(x) (((x) & DNS_NSEC3FLAG_INITIAL) != 0) 56 #define REMOVE(x) (((x) & DNS_NSEC3FLAG_REMOVE) != 0) 57 58 isc_result_t 59 dns_nsec3_buildrdata(dns_db_t *db, dns_dbversion_t *version, dns_dbnode_t *node, 60 unsigned int hashalg, unsigned int flags, 61 unsigned int iterations, const unsigned char *salt, 62 size_t salt_length, const unsigned char *nexthash, 63 size_t hash_length, unsigned char *buffer, 64 dns_rdata_t *rdata) { 65 isc_result_t result; 66 dns_rdataset_t rdataset; 67 isc_region_t r; 68 unsigned int i; 69 bool found; 70 bool found_ns; 71 bool need_rrsig; 72 73 unsigned char *nsec_bits, *bm; 74 unsigned int max_type; 75 dns_rdatasetiter_t *rdsiter; 76 unsigned char *p; 77 78 REQUIRE(salt_length < 256U); 79 REQUIRE(hash_length < 256U); 80 REQUIRE(flags <= 0xffU); 81 REQUIRE(hashalg <= 0xffU); 82 REQUIRE(iterations <= 0xffffU); 83 84 switch (hashalg) { 85 case dns_hash_sha1: 86 REQUIRE(hash_length == ISC_SHA1_DIGESTLENGTH); 87 break; 88 } 89 90 memset(buffer, 0, DNS_NSEC3_BUFFERSIZE); 91 92 p = buffer; 93 94 *p++ = hashalg; 95 *p++ = flags; 96 97 *p++ = iterations >> 8; 98 *p++ = iterations; 99 100 *p++ = (unsigned char)salt_length; 101 memmove(p, salt, salt_length); 102 p += salt_length; 103 104 *p++ = (unsigned char)hash_length; 105 memmove(p, nexthash, hash_length); 106 p += hash_length; 107 108 r.length = (unsigned int)(p - buffer); 109 r.base = buffer; 110 111 /* 112 * Use the end of the space for a raw bitmap leaving enough 113 * space for the window identifiers and length octets. 114 */ 115 bm = r.base + r.length + 512; 116 nsec_bits = r.base + r.length; 117 max_type = 0; 118 if (node == NULL) { 119 goto collapse_bitmap; 120 } 121 dns_rdataset_init(&rdataset); 122 rdsiter = NULL; 123 result = dns_db_allrdatasets(db, node, version, 0, 0, &rdsiter); 124 if (result != ISC_R_SUCCESS) { 125 return result; 126 } 127 found = found_ns = need_rrsig = false; 128 for (result = dns_rdatasetiter_first(rdsiter); result == ISC_R_SUCCESS; 129 result = dns_rdatasetiter_next(rdsiter)) 130 { 131 dns_rdatasetiter_current(rdsiter, &rdataset); 132 if (rdataset.type != dns_rdatatype_nsec && 133 rdataset.type != dns_rdatatype_nsec3 && 134 rdataset.type != dns_rdatatype_rrsig) 135 { 136 if (rdataset.type > max_type) { 137 max_type = rdataset.type; 138 } 139 dns_nsec_setbit(bm, rdataset.type, 1); 140 /* 141 * Work out if we need to set the RRSIG bit for 142 * this node. We set the RRSIG bit if either of 143 * the following conditions are met: 144 * 1) We have a SOA or DS then we need to set 145 * the RRSIG bit as both always will be signed. 146 * 2) We set the RRSIG bit if we don't have 147 * a NS record but do have other data. 148 */ 149 if (rdataset.type == dns_rdatatype_soa || 150 rdataset.type == dns_rdatatype_ds) 151 { 152 need_rrsig = true; 153 } else if (rdataset.type == dns_rdatatype_ns) { 154 found_ns = true; 155 } else { 156 found = true; 157 } 158 } 159 dns_rdataset_disassociate(&rdataset); 160 } 161 if ((found && !found_ns) || need_rrsig) { 162 if (dns_rdatatype_rrsig > max_type) { 163 max_type = dns_rdatatype_rrsig; 164 } 165 dns_nsec_setbit(bm, dns_rdatatype_rrsig, 1); 166 } 167 168 /* 169 * At zone cuts, deny the existence of glue in the parent zone. 170 */ 171 if (dns_nsec_isset(bm, dns_rdatatype_ns) && 172 !dns_nsec_isset(bm, dns_rdatatype_soa)) 173 { 174 for (i = 0; i <= max_type; i++) { 175 if (dns_nsec_isset(bm, i) && 176 !dns_rdatatype_iszonecutauth((dns_rdatatype_t)i)) 177 { 178 dns_nsec_setbit(bm, i, 0); 179 } 180 } 181 } 182 183 dns_rdatasetiter_destroy(&rdsiter); 184 if (result != ISC_R_NOMORE) { 185 return result; 186 } 187 188 collapse_bitmap: 189 nsec_bits += dns_nsec_compressbitmap(nsec_bits, bm, max_type); 190 r.length = (unsigned int)(nsec_bits - r.base); 191 INSIST(r.length <= DNS_NSEC3_BUFFERSIZE); 192 dns_rdata_fromregion(rdata, dns_db_class(db), dns_rdatatype_nsec3, &r); 193 194 return ISC_R_SUCCESS; 195 } 196 197 bool 198 dns_nsec3_typepresent(dns_rdata_t *rdata, dns_rdatatype_t type) { 199 dns_rdata_nsec3_t nsec3; 200 isc_result_t result; 201 bool present; 202 unsigned int i, len, window; 203 204 REQUIRE(rdata != NULL); 205 REQUIRE(rdata->type == dns_rdatatype_nsec3); 206 207 /* This should never fail */ 208 result = dns_rdata_tostruct(rdata, &nsec3, NULL); 209 INSIST(result == ISC_R_SUCCESS); 210 211 present = false; 212 for (i = 0; i < nsec3.len; i += len) { 213 INSIST(i + 2 <= nsec3.len); 214 window = nsec3.typebits[i]; 215 len = nsec3.typebits[i + 1]; 216 INSIST(len > 0 && len <= 32); 217 i += 2; 218 INSIST(i + len <= nsec3.len); 219 if (window * 256 > type) { 220 break; 221 } 222 if ((window + 1) * 256 <= type) { 223 continue; 224 } 225 if (type < (window * 256) + len * 8) { 226 present = dns_nsec_isset(&nsec3.typebits[i], 227 type % 256); 228 } 229 break; 230 } 231 dns_rdata_freestruct(&nsec3); 232 return present; 233 } 234 235 isc_result_t 236 dns_nsec3_generate_salt(unsigned char *salt, size_t saltlen) { 237 if (saltlen > 255U) { 238 return ISC_R_RANGE; 239 } 240 isc_nonce_buf(salt, saltlen); 241 return ISC_R_SUCCESS; 242 } 243 244 isc_result_t 245 dns_nsec3_hashname(dns_fixedname_t *result, 246 unsigned char rethash[NSEC3_MAX_HASH_LENGTH], 247 size_t *hash_length, const dns_name_t *name, 248 const dns_name_t *origin, dns_hash_t hashalg, 249 unsigned int iterations, const unsigned char *salt, 250 size_t saltlength) { 251 unsigned char hash[NSEC3_MAX_HASH_LENGTH]; 252 unsigned char nametext[DNS_NAME_FORMATSIZE]; 253 dns_fixedname_t fixed; 254 dns_name_t *downcased; 255 isc_buffer_t namebuffer; 256 isc_region_t region; 257 size_t len; 258 259 if (rethash == NULL) { 260 rethash = hash; 261 } 262 263 memset(rethash, 0, NSEC3_MAX_HASH_LENGTH); 264 265 downcased = dns_fixedname_initname(&fixed); 266 dns_name_downcase(name, downcased, NULL); 267 268 /* hash the node name */ 269 len = isc_iterated_hash(rethash, hashalg, iterations, salt, 270 (int)saltlength, downcased->ndata, 271 downcased->length); 272 if (len == 0U) { 273 return DNS_R_BADALG; 274 } 275 276 SET_IF_NOT_NULL(hash_length, len); 277 278 /* convert the hash to base32hex non-padded */ 279 region.base = rethash; 280 region.length = (unsigned int)len; 281 isc_buffer_init(&namebuffer, nametext, sizeof nametext); 282 isc_base32hexnp_totext(®ion, 1, "", &namebuffer); 283 284 /* convert the hex to a domain name */ 285 dns_fixedname_init(result); 286 return dns_name_fromtext(dns_fixedname_name(result), &namebuffer, 287 origin, 0, NULL); 288 } 289 290 unsigned int 291 dns_nsec3_hashlength(dns_hash_t hash) { 292 switch (hash) { 293 case dns_hash_sha1: 294 return ISC_SHA1_DIGESTLENGTH; 295 } 296 return 0; 297 } 298 299 bool 300 dns_nsec3_supportedhash(dns_hash_t hash) { 301 switch (hash) { 302 case dns_hash_sha1: 303 return true; 304 } 305 return false; 306 } 307 308 /*% 309 * Update a single RR in version 'ver' of 'db' and log the 310 * update in 'diff'. 311 * 312 * Ensures: 313 * \li '*tuple' == NULL. Either the tuple is freed, or its 314 * ownership has been transferred to the diff. 315 */ 316 static isc_result_t 317 do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver, 318 dns_diff_t *diff) { 319 dns_diff_t temp_diff; 320 isc_result_t result; 321 322 /* 323 * Create a singleton diff. 324 */ 325 dns_diff_init(diff->mctx, &temp_diff); 326 ISC_LIST_APPEND(temp_diff.tuples, *tuple, link); 327 328 /* 329 * Apply it to the database. 330 */ 331 result = dns_diff_apply(&temp_diff, db, ver); 332 ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link); 333 if (result != ISC_R_SUCCESS) { 334 dns_difftuple_free(tuple); 335 return result; 336 } 337 338 /* 339 * Merge it into the current pending journal entry. 340 */ 341 dns_diff_appendminimal(diff, tuple); 342 343 /* 344 * Do not clear temp_diff. 345 */ 346 return ISC_R_SUCCESS; 347 } 348 349 /*% 350 * Set '*exists' to true iff the given name exists, to false otherwise. 351 */ 352 static isc_result_t 353 name_exists(dns_db_t *db, dns_dbversion_t *version, const dns_name_t *name, 354 bool *exists) { 355 isc_result_t result; 356 dns_dbnode_t *node = NULL; 357 dns_rdatasetiter_t *iter = NULL; 358 359 result = dns_db_findnode(db, name, false, &node); 360 if (result == ISC_R_NOTFOUND) { 361 *exists = false; 362 return ISC_R_SUCCESS; 363 } 364 if (result != ISC_R_SUCCESS) { 365 return result; 366 } 367 368 result = dns_db_allrdatasets(db, node, version, 0, (isc_stdtime_t)0, 369 &iter); 370 if (result != ISC_R_SUCCESS) { 371 goto cleanup_node; 372 } 373 374 result = dns_rdatasetiter_first(iter); 375 if (result == ISC_R_SUCCESS) { 376 *exists = true; 377 } else if (result == ISC_R_NOMORE) { 378 *exists = false; 379 result = ISC_R_SUCCESS; 380 } else { 381 *exists = false; 382 } 383 dns_rdatasetiter_destroy(&iter); 384 385 cleanup_node: 386 dns_db_detachnode(db, &node); 387 return result; 388 } 389 390 static bool 391 match_nsec3param(const dns_rdata_nsec3_t *nsec3, 392 const dns_rdata_nsec3param_t *nsec3param) { 393 if (nsec3->hash == nsec3param->hash && 394 nsec3->iterations == nsec3param->iterations && 395 nsec3->salt_length == nsec3param->salt_length && 396 !memcmp(nsec3->salt, nsec3param->salt, nsec3->salt_length)) 397 { 398 return true; 399 } 400 return false; 401 } 402 403 /*% 404 * Delete NSEC3 records at "name" which match "param", recording the 405 * change in "diff". 406 */ 407 static isc_result_t 408 delnsec3(dns_db_t *db, dns_dbversion_t *version, const dns_name_t *name, 409 const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff) { 410 dns_dbnode_t *node = NULL; 411 dns_difftuple_t *tuple = NULL; 412 dns_rdata_nsec3_t nsec3; 413 dns_rdataset_t rdataset; 414 isc_result_t result; 415 416 result = dns_db_findnsec3node(db, name, false, &node); 417 if (result == ISC_R_NOTFOUND) { 418 return ISC_R_SUCCESS; 419 } 420 if (result != ISC_R_SUCCESS) { 421 return result; 422 } 423 424 dns_rdataset_init(&rdataset); 425 result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3, 0, 426 (isc_stdtime_t)0, &rdataset, NULL); 427 428 if (result == ISC_R_NOTFOUND) { 429 result = ISC_R_SUCCESS; 430 goto cleanup_node; 431 } 432 if (result != ISC_R_SUCCESS) { 433 goto cleanup_node; 434 } 435 436 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 437 result = dns_rdataset_next(&rdataset)) 438 { 439 dns_rdata_t rdata = DNS_RDATA_INIT; 440 dns_rdataset_current(&rdataset, &rdata); 441 CHECK(dns_rdata_tostruct(&rdata, &nsec3, NULL)); 442 443 if (!match_nsec3param(&nsec3, nsec3param)) { 444 continue; 445 } 446 447 result = dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, name, 448 rdataset.ttl, &rdata, &tuple); 449 if (result != ISC_R_SUCCESS) { 450 goto failure; 451 } 452 result = do_one_tuple(&tuple, db, version, diff); 453 if (result != ISC_R_SUCCESS) { 454 goto failure; 455 } 456 } 457 if (result != ISC_R_NOMORE) { 458 goto failure; 459 } 460 result = ISC_R_SUCCESS; 461 462 failure: 463 dns_rdataset_disassociate(&rdataset); 464 cleanup_node: 465 dns_db_detachnode(db, &node); 466 467 return result; 468 } 469 470 static bool 471 better_param(dns_rdataset_t *nsec3paramset, dns_rdata_t *param) { 472 dns_rdataset_t rdataset; 473 isc_result_t result; 474 475 if (REMOVE(param->data[1])) { 476 return true; 477 } 478 479 dns_rdataset_init(&rdataset); 480 dns_rdataset_clone(nsec3paramset, &rdataset); 481 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 482 result = dns_rdataset_next(&rdataset)) 483 { 484 dns_rdata_t rdata = DNS_RDATA_INIT; 485 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 486 487 if (rdataset.type != dns_rdatatype_nsec3param) { 488 dns_rdata_t tmprdata = DNS_RDATA_INIT; 489 dns_rdataset_current(&rdataset, &tmprdata); 490 if (!dns_nsec3param_fromprivate(&tmprdata, &rdata, buf, 491 sizeof(buf))) 492 { 493 continue; 494 } 495 } else { 496 dns_rdataset_current(&rdataset, &rdata); 497 } 498 499 if (rdata.length != param->length) { 500 continue; 501 } 502 if (rdata.data[0] != param->data[0] || REMOVE(rdata.data[1]) || 503 rdata.data[2] != param->data[2] || 504 rdata.data[3] != param->data[3] || 505 rdata.data[4] != param->data[4] || 506 memcmp(&rdata.data[5], ¶m->data[5], param->data[4])) 507 { 508 continue; 509 } 510 if (CREATE(rdata.data[1]) && !CREATE(param->data[1])) { 511 dns_rdataset_disassociate(&rdataset); 512 return true; 513 } 514 } 515 dns_rdataset_disassociate(&rdataset); 516 return false; 517 } 518 519 static isc_result_t 520 find_nsec3(dns_rdata_nsec3_t *nsec3, dns_rdataset_t *rdataset, 521 const dns_rdata_nsec3param_t *nsec3param) { 522 isc_result_t result; 523 for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS; 524 result = dns_rdataset_next(rdataset)) 525 { 526 dns_rdata_t rdata = DNS_RDATA_INIT; 527 528 dns_rdataset_current(rdataset, &rdata); 529 CHECK(dns_rdata_tostruct(&rdata, nsec3, NULL)); 530 dns_rdata_reset(&rdata); 531 if (match_nsec3param(nsec3, nsec3param)) { 532 break; 533 } 534 } 535 failure: 536 return result; 537 } 538 539 isc_result_t 540 dns_nsec3_addnsec3(dns_db_t *db, dns_dbversion_t *version, 541 const dns_name_t *name, 542 const dns_rdata_nsec3param_t *nsec3param, dns_ttl_t nsecttl, 543 bool unsecure, dns_diff_t *diff) { 544 dns_dbiterator_t *dbit = NULL; 545 dns_dbnode_t *node = NULL; 546 dns_dbnode_t *newnode = NULL; 547 dns_difftuple_t *tuple = NULL; 548 dns_fixedname_t fixed; 549 dns_fixedname_t fprev; 550 dns_hash_t hash; 551 dns_name_t *hashname; 552 dns_name_t *origin; 553 dns_name_t *prev; 554 dns_name_t empty; 555 dns_rdata_nsec3_t nsec3; 556 dns_rdata_t rdata = DNS_RDATA_INIT; 557 dns_rdataset_t rdataset; 558 int pass; 559 bool exists = false; 560 bool maybe_remove_unsecure = false; 561 uint8_t flags; 562 isc_buffer_t buffer; 563 isc_result_t result; 564 unsigned char *old_next; 565 unsigned char *salt; 566 unsigned char nexthash[NSEC3_MAX_HASH_LENGTH]; 567 unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE]; 568 unsigned int iterations; 569 unsigned int labels; 570 size_t next_length; 571 unsigned int old_length; 572 unsigned int salt_length; 573 574 hashname = dns_fixedname_initname(&fixed); 575 prev = dns_fixedname_initname(&fprev); 576 577 dns_rdataset_init(&rdataset); 578 579 origin = dns_db_origin(db); 580 581 /* 582 * Chain parameters. 583 */ 584 hash = nsec3param->hash; 585 iterations = nsec3param->iterations; 586 salt_length = nsec3param->salt_length; 587 salt = nsec3param->salt; 588 589 /* 590 * Default flags for a new chain. 591 */ 592 flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT; 593 594 /* 595 * If this is the first NSEC3 in the chain nexthash will 596 * remain pointing to itself. 597 */ 598 next_length = sizeof(nexthash); 599 CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, name, origin, 600 hash, iterations, salt, salt_length)); 601 INSIST(next_length <= sizeof(nexthash)); 602 603 /* 604 * Create the node if it doesn't exist and hold 605 * a reference to it until we have added the NSEC3. 606 */ 607 CHECK(dns_db_findnsec3node(db, hashname, true, &newnode)); 608 609 /* 610 * Seek the iterator to the 'newnode'. 611 */ 612 CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit)); 613 CHECK(dns_dbiterator_seek(dbit, hashname)); 614 CHECK(dns_dbiterator_pause(dbit)); 615 result = dns_db_findrdataset(db, newnode, version, dns_rdatatype_nsec3, 616 0, (isc_stdtime_t)0, &rdataset, NULL); 617 /* 618 * If we updating a existing NSEC3 then find its 619 * next field. 620 */ 621 if (result == ISC_R_SUCCESS) { 622 result = find_nsec3(&nsec3, &rdataset, nsec3param); 623 if (result == ISC_R_SUCCESS) { 624 if (!CREATE(nsec3param->flags)) { 625 flags = nsec3.flags; 626 } 627 next_length = nsec3.next_length; 628 INSIST(next_length <= sizeof(nexthash)); 629 memmove(nexthash, nsec3.next, next_length); 630 dns_rdataset_disassociate(&rdataset); 631 /* 632 * If the NSEC3 is not for a unsecure delegation then 633 * we are just updating it. If it is for a unsecure 634 * delegation then we need find out if we need to 635 * remove the NSEC3 record or not by examining the 636 * previous NSEC3 record. 637 */ 638 if (!unsecure) { 639 goto addnsec3; 640 } else if (CREATE(nsec3param->flags) && OPTOUT(flags)) { 641 result = dns_nsec3_delnsec3(db, version, name, 642 nsec3param, diff); 643 goto failure; 644 } else { 645 maybe_remove_unsecure = true; 646 } 647 } else { 648 dns_rdataset_disassociate(&rdataset); 649 if (result != ISC_R_NOMORE) { 650 goto failure; 651 } 652 } 653 } 654 655 /* 656 * Find the previous NSEC3 (if any) and update it if required. 657 */ 658 pass = 0; 659 do { 660 result = dns_dbiterator_prev(dbit); 661 if (result == ISC_R_NOMORE) { 662 pass++; 663 CHECK(dns_dbiterator_last(dbit)); 664 } 665 CHECK(dns_dbiterator_current(dbit, &node, prev)); 666 CHECK(dns_dbiterator_pause(dbit)); 667 result = dns_db_findrdataset(db, node, version, 668 dns_rdatatype_nsec3, 0, 669 (isc_stdtime_t)0, &rdataset, NULL); 670 dns_db_detachnode(db, &node); 671 if (result != ISC_R_SUCCESS) { 672 continue; 673 } 674 675 result = find_nsec3(&nsec3, &rdataset, nsec3param); 676 if (result == ISC_R_NOMORE) { 677 dns_rdataset_disassociate(&rdataset); 678 continue; 679 } 680 if (result != ISC_R_SUCCESS) { 681 goto failure; 682 } 683 684 if (maybe_remove_unsecure) { 685 dns_rdataset_disassociate(&rdataset); 686 /* 687 * If we have OPTOUT set in the previous NSEC3 record 688 * we actually need to delete the NSEC3 record. 689 * Otherwise we just need to replace the NSEC3 record. 690 */ 691 if (OPTOUT(nsec3.flags)) { 692 result = dns_nsec3_delnsec3(db, version, name, 693 nsec3param, diff); 694 goto failure; 695 } 696 goto addnsec3; 697 } else { 698 /* 699 * Is this is a unsecure delegation we are adding? 700 * If so no change is required. 701 */ 702 if (OPTOUT(nsec3.flags) && unsecure) { 703 dns_rdataset_disassociate(&rdataset); 704 goto failure; 705 } 706 } 707 708 old_next = nsec3.next; 709 old_length = nsec3.next_length; 710 711 /* 712 * Delete the old previous NSEC3. 713 */ 714 CHECK(delnsec3(db, version, prev, nsec3param, diff)); 715 716 /* 717 * Fixup the previous NSEC3. 718 */ 719 nsec3.next = nexthash; 720 nsec3.next_length = (unsigned char)next_length; 721 isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf)); 722 CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass, 723 dns_rdatatype_nsec3, &nsec3, 724 &buffer)); 725 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev, 726 rdataset.ttl, &rdata, &tuple)); 727 CHECK(do_one_tuple(&tuple, db, version, diff)); 728 INSIST(old_length <= sizeof(nexthash)); 729 memmove(nexthash, old_next, old_length); 730 if (!CREATE(nsec3param->flags)) { 731 flags = nsec3.flags; 732 } 733 dns_rdata_reset(&rdata); 734 dns_rdataset_disassociate(&rdataset); 735 break; 736 } while (pass < 2); 737 738 addnsec3: 739 /* 740 * Create the NSEC3 RDATA. 741 */ 742 CHECK(dns_db_findnode(db, name, false, &node)); 743 CHECK(dns_nsec3_buildrdata(db, version, node, hash, flags, iterations, 744 salt, salt_length, nexthash, next_length, 745 nsec3buf, &rdata)); 746 dns_db_detachnode(db, &node); 747 748 /* 749 * Delete the old NSEC3 and record the change. 750 */ 751 CHECK(delnsec3(db, version, hashname, nsec3param, diff)); 752 /* 753 * Add the new NSEC3 and record the change. 754 */ 755 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, hashname, 756 nsecttl, &rdata, &tuple)); 757 CHECK(do_one_tuple(&tuple, db, version, diff)); 758 INSIST(tuple == NULL); 759 dns_rdata_reset(&rdata); 760 dns_db_detachnode(db, &newnode); 761 762 /* 763 * Add missing NSEC3 records for empty nodes 764 */ 765 dns_name_init(&empty, NULL); 766 dns_name_clone(name, &empty); 767 do { 768 labels = dns_name_countlabels(&empty) - 1; 769 if (labels <= dns_name_countlabels(origin)) { 770 break; 771 } 772 dns_name_getlabelsequence(&empty, 1, labels, &empty); 773 CHECK(name_exists(db, version, &empty, &exists)); 774 if (exists) { 775 break; 776 } 777 CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, &empty, 778 origin, hash, iterations, salt, 779 salt_length)); 780 781 /* 782 * Create the node if it doesn't exist and hold 783 * a reference to it until we have added the NSEC3 784 * or we discover we don't need to make a change. 785 */ 786 CHECK(dns_db_findnsec3node(db, hashname, true, &newnode)); 787 result = dns_db_findrdataset(db, newnode, version, 788 dns_rdatatype_nsec3, 0, 789 (isc_stdtime_t)0, &rdataset, NULL); 790 if (result == ISC_R_SUCCESS) { 791 result = find_nsec3(&nsec3, &rdataset, nsec3param); 792 dns_rdataset_disassociate(&rdataset); 793 if (result == ISC_R_SUCCESS) { 794 dns_db_detachnode(db, &newnode); 795 break; 796 } 797 if (result != ISC_R_NOMORE) { 798 goto failure; 799 } 800 } else if (result == ISC_R_NOTFOUND) { 801 /* 802 * If we didn't find an NSEC3 in the node, 803 * then the node must have been newly created 804 * by dns_db_findnsec3node(). The iterator 805 * needs to be updated so we can seek for 806 * the node's predecessor. 807 */ 808 dns_dbiterator_destroy(&dbit); 809 CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, 810 &dbit)); 811 } 812 813 /* 814 * Find the previous NSEC3 and update it. 815 */ 816 CHECK(dns_dbiterator_seek(dbit, hashname)); 817 pass = 0; 818 do { 819 result = dns_dbiterator_prev(dbit); 820 if (result == ISC_R_NOMORE) { 821 pass++; 822 CHECK(dns_dbiterator_last(dbit)); 823 } 824 CHECK(dns_dbiterator_current(dbit, &node, prev)); 825 CHECK(dns_dbiterator_pause(dbit)); 826 result = dns_db_findrdataset( 827 db, node, version, dns_rdatatype_nsec3, 0, 828 (isc_stdtime_t)0, &rdataset, NULL); 829 dns_db_detachnode(db, &node); 830 if (result != ISC_R_SUCCESS) { 831 continue; 832 } 833 result = find_nsec3(&nsec3, &rdataset, nsec3param); 834 if (result == ISC_R_NOMORE) { 835 dns_rdataset_disassociate(&rdataset); 836 continue; 837 } 838 if (result != ISC_R_SUCCESS) { 839 goto failure; 840 } 841 842 old_next = nsec3.next; 843 old_length = nsec3.next_length; 844 845 /* 846 * Delete the old previous NSEC3. 847 */ 848 CHECK(delnsec3(db, version, prev, nsec3param, diff)); 849 850 /* 851 * Fixup the previous NSEC3. 852 */ 853 nsec3.next = nexthash; 854 nsec3.next_length = (unsigned char)next_length; 855 isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf)); 856 CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass, 857 dns_rdatatype_nsec3, &nsec3, 858 &buffer)); 859 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 860 prev, rdataset.ttl, &rdata, 861 &tuple)); 862 CHECK(do_one_tuple(&tuple, db, version, diff)); 863 INSIST(old_length <= sizeof(nexthash)); 864 memmove(nexthash, old_next, old_length); 865 if (!CREATE(nsec3param->flags)) { 866 flags = nsec3.flags; 867 } 868 dns_rdata_reset(&rdata); 869 dns_rdataset_disassociate(&rdataset); 870 break; 871 } while (pass < 2); 872 873 INSIST(pass < 2); 874 875 /* 876 * Create the NSEC3 RDATA for the empty node. 877 */ 878 CHECK(dns_nsec3_buildrdata( 879 db, version, NULL, hash, flags, iterations, salt, 880 salt_length, nexthash, next_length, nsec3buf, &rdata)); 881 /* 882 * Delete the old NSEC3 and record the change. 883 */ 884 CHECK(delnsec3(db, version, hashname, nsec3param, diff)); 885 886 /* 887 * Add the new NSEC3 and record the change. 888 */ 889 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, hashname, 890 nsecttl, &rdata, &tuple)); 891 CHECK(do_one_tuple(&tuple, db, version, diff)); 892 INSIST(tuple == NULL); 893 dns_rdata_reset(&rdata); 894 dns_db_detachnode(db, &newnode); 895 } while (1); 896 897 /* result cannot be ISC_R_NOMORE here */ 898 INSIST(result != ISC_R_NOMORE); 899 900 failure: 901 if (dbit != NULL) { 902 dns_dbiterator_destroy(&dbit); 903 } 904 if (dns_rdataset_isassociated(&rdataset)) { 905 dns_rdataset_disassociate(&rdataset); 906 } 907 if (node != NULL) { 908 dns_db_detachnode(db, &node); 909 } 910 if (newnode != NULL) { 911 dns_db_detachnode(db, &newnode); 912 } 913 return result; 914 } 915 916 /*% 917 * Add NSEC3 records for "name", recording the change in "diff". 918 * The existing NSEC3 records are removed. 919 */ 920 isc_result_t 921 dns_nsec3_addnsec3s(dns_db_t *db, dns_dbversion_t *version, 922 const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure, 923 dns_diff_t *diff) { 924 dns_dbnode_t *node = NULL; 925 dns_rdata_nsec3param_t nsec3param; 926 dns_rdataset_t rdataset; 927 isc_result_t result; 928 929 dns_rdataset_init(&rdataset); 930 931 /* 932 * Find the NSEC3 parameters for this zone. 933 */ 934 result = dns_db_getoriginnode(db, &node); 935 if (result != ISC_R_SUCCESS) { 936 return result; 937 } 938 939 result = dns_db_findrdataset(db, node, version, 940 dns_rdatatype_nsec3param, 0, 0, &rdataset, 941 NULL); 942 dns_db_detachnode(db, &node); 943 if (result == ISC_R_NOTFOUND) { 944 return ISC_R_SUCCESS; 945 } 946 if (result != ISC_R_SUCCESS) { 947 return result; 948 } 949 950 /* 951 * Update each active NSEC3 chain. 952 */ 953 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 954 result = dns_rdataset_next(&rdataset)) 955 { 956 dns_rdata_t rdata = DNS_RDATA_INIT; 957 958 dns_rdataset_current(&rdataset, &rdata); 959 CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); 960 961 if (nsec3param.flags != 0) { 962 continue; 963 } 964 /* 965 * We have a active chain. Update it. 966 */ 967 CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param, 968 nsecttl, unsecure, diff)); 969 } 970 if (result == ISC_R_NOMORE) { 971 result = ISC_R_SUCCESS; 972 } 973 974 failure: 975 if (dns_rdataset_isassociated(&rdataset)) { 976 dns_rdataset_disassociate(&rdataset); 977 } 978 if (node != NULL) { 979 dns_db_detachnode(db, &node); 980 } 981 982 return result; 983 } 984 985 bool 986 dns_nsec3param_fromprivate(dns_rdata_t *src, dns_rdata_t *target, 987 unsigned char *buf, size_t buflen) { 988 isc_result_t result; 989 isc_buffer_t buf1; 990 isc_buffer_t buf2; 991 992 /* 993 * Algorithm 0 (reserved by RFC 4034) is used to identify 994 * NSEC3PARAM records from DNSKEY pointers. 995 */ 996 if (src->length < 1 || src->data[0] != 0) { 997 return false; 998 } 999 1000 isc_buffer_init(&buf1, src->data + 1, src->length - 1); 1001 isc_buffer_add(&buf1, src->length - 1); 1002 isc_buffer_setactive(&buf1, src->length - 1); 1003 isc_buffer_init(&buf2, buf, (unsigned int)buflen); 1004 result = dns_rdata_fromwire(target, src->rdclass, 1005 dns_rdatatype_nsec3param, &buf1, 1006 DNS_DECOMPRESS_NEVER, &buf2); 1007 1008 return result == ISC_R_SUCCESS; 1009 } 1010 1011 void 1012 dns_nsec3param_toprivate(dns_rdata_t *src, dns_rdata_t *target, 1013 dns_rdatatype_t privatetype, unsigned char *buf, 1014 size_t buflen) { 1015 REQUIRE(buflen >= (unsigned int)src->length + 1); 1016 1017 REQUIRE(DNS_RDATA_INITIALIZED(target)); 1018 1019 memmove(buf + 1, src->data, src->length); 1020 buf[0] = 0; 1021 target->data = buf; 1022 target->length = src->length + 1; 1023 target->type = privatetype; 1024 target->rdclass = src->rdclass; 1025 target->flags = 0; 1026 ISC_LINK_INIT(target, link); 1027 } 1028 1029 static isc_result_t 1030 rr_exists(dns_db_t *db, dns_dbversion_t *ver, const dns_name_t *name, 1031 const dns_rdata_t *rdata, bool *flag) { 1032 dns_rdataset_t rdataset; 1033 dns_dbnode_t *node = NULL; 1034 isc_result_t result; 1035 1036 dns_rdataset_init(&rdataset); 1037 if (rdata->type == dns_rdatatype_nsec3) { 1038 CHECK(dns_db_findnsec3node(db, name, false, &node)); 1039 } else { 1040 CHECK(dns_db_findnode(db, name, false, &node)); 1041 } 1042 result = dns_db_findrdataset(db, node, ver, rdata->type, 0, 1043 (isc_stdtime_t)0, &rdataset, NULL); 1044 if (result == ISC_R_NOTFOUND) { 1045 *flag = false; 1046 result = ISC_R_SUCCESS; 1047 goto failure; 1048 } 1049 1050 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1051 result = dns_rdataset_next(&rdataset)) 1052 { 1053 dns_rdata_t myrdata = DNS_RDATA_INIT; 1054 dns_rdataset_current(&rdataset, &myrdata); 1055 if (!dns_rdata_casecompare(&myrdata, rdata)) { 1056 break; 1057 } 1058 } 1059 dns_rdataset_disassociate(&rdataset); 1060 if (result == ISC_R_SUCCESS) { 1061 *flag = true; 1062 } else if (result == ISC_R_NOMORE) { 1063 *flag = false; 1064 result = ISC_R_SUCCESS; 1065 } 1066 1067 failure: 1068 if (node != NULL) { 1069 dns_db_detachnode(db, &node); 1070 } 1071 return result; 1072 } 1073 1074 isc_result_t 1075 dns_nsec3param_salttotext(dns_rdata_nsec3param_t *nsec3param, char *dst, 1076 size_t dstlen) { 1077 isc_result_t result; 1078 isc_region_t r; 1079 isc_buffer_t b; 1080 1081 REQUIRE(nsec3param != NULL); 1082 REQUIRE(dst != NULL); 1083 1084 if (nsec3param->salt_length == 0) { 1085 if (dstlen < 2U) { 1086 return ISC_R_NOSPACE; 1087 } 1088 strlcpy(dst, "-", dstlen); 1089 return ISC_R_SUCCESS; 1090 } 1091 1092 r.base = nsec3param->salt; 1093 r.length = nsec3param->salt_length; 1094 isc_buffer_init(&b, dst, (unsigned int)dstlen); 1095 1096 result = isc_hex_totext(&r, 2, "", &b); 1097 if (result != ISC_R_SUCCESS) { 1098 return result; 1099 } 1100 1101 if (isc_buffer_availablelength(&b) < 1) { 1102 return ISC_R_NOSPACE; 1103 } 1104 isc_buffer_putuint8(&b, 0); 1105 1106 return ISC_R_SUCCESS; 1107 } 1108 1109 isc_result_t 1110 dns_nsec3param_deletechains(dns_db_t *db, dns_dbversion_t *ver, 1111 dns_zone_t *zone, bool nonsec, dns_diff_t *diff) { 1112 dns_dbnode_t *node = NULL; 1113 dns_difftuple_t *tuple = NULL; 1114 dns_name_t next; 1115 dns_rdata_t rdata = DNS_RDATA_INIT; 1116 dns_rdataset_t rdataset; 1117 bool flag; 1118 isc_result_t result = ISC_R_SUCCESS; 1119 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1]; 1120 dns_name_t *origin = dns_zone_getorigin(zone); 1121 dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); 1122 1123 dns_name_init(&next, NULL); 1124 dns_rdataset_init(&rdataset); 1125 1126 result = dns_db_getoriginnode(db, &node); 1127 if (result != ISC_R_SUCCESS) { 1128 return result; 1129 } 1130 1131 /* 1132 * Cause all NSEC3 chains to be deleted. 1133 */ 1134 result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param, 0, 1135 (isc_stdtime_t)0, &rdataset, NULL); 1136 if (result == ISC_R_NOTFOUND) { 1137 goto try_private; 1138 } 1139 if (result != ISC_R_SUCCESS) { 1140 goto failure; 1141 } 1142 1143 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1144 result = dns_rdataset_next(&rdataset)) 1145 { 1146 dns_rdata_t private = DNS_RDATA_INIT; 1147 1148 dns_rdataset_current(&rdataset, &rdata); 1149 dns_nsec3param_toprivate(&rdata, &private, privatetype, buf, 1150 sizeof(buf)); 1151 buf[2] = DNS_NSEC3FLAG_REMOVE; 1152 if (nonsec) { 1153 buf[2] |= DNS_NSEC3FLAG_NONSEC; 1154 } 1155 1156 CHECK(rr_exists(db, ver, origin, &private, &flag)); 1157 1158 if (!flag) { 1159 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 1160 origin, 0, &private, 1161 &tuple)); 1162 CHECK(do_one_tuple(&tuple, db, ver, diff)); 1163 INSIST(tuple == NULL); 1164 } 1165 dns_rdata_reset(&rdata); 1166 } 1167 if (result != ISC_R_NOMORE) { 1168 goto failure; 1169 } 1170 1171 dns_rdataset_disassociate(&rdataset); 1172 1173 try_private: 1174 if (privatetype == 0) { 1175 goto success; 1176 } 1177 result = dns_db_findrdataset(db, node, ver, privatetype, 0, 1178 (isc_stdtime_t)0, &rdataset, NULL); 1179 if (result == ISC_R_NOTFOUND) { 1180 goto success; 1181 } 1182 if (result != ISC_R_SUCCESS) { 1183 goto failure; 1184 } 1185 1186 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1187 result = dns_rdataset_next(&rdataset)) 1188 { 1189 dns_rdata_reset(&rdata); 1190 dns_rdataset_current(&rdataset, &rdata); 1191 INSIST(rdata.length <= sizeof(buf)); 1192 memmove(buf, rdata.data, rdata.length); 1193 1194 /* 1195 * Private NSEC3 record length >= 6. 1196 * <0(1), hash(1), flags(1), iterations(2), saltlen(1)> 1197 */ 1198 if (rdata.length < 6 || buf[0] != 0 || 1199 (buf[2] & DNS_NSEC3FLAG_REMOVE) != 0 || 1200 (nonsec && (buf[2] & DNS_NSEC3FLAG_NONSEC) != 0)) 1201 { 1202 continue; 1203 } 1204 1205 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin, 1206 0, &rdata, &tuple)); 1207 CHECK(do_one_tuple(&tuple, db, ver, diff)); 1208 INSIST(tuple == NULL); 1209 1210 rdata.data = buf; 1211 buf[2] = DNS_NSEC3FLAG_REMOVE; 1212 if (nonsec) { 1213 buf[2] |= DNS_NSEC3FLAG_NONSEC; 1214 } 1215 1216 CHECK(rr_exists(db, ver, origin, &rdata, &flag)); 1217 1218 if (!flag) { 1219 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 1220 origin, 0, &rdata, &tuple)); 1221 CHECK(do_one_tuple(&tuple, db, ver, diff)); 1222 INSIST(tuple == NULL); 1223 } 1224 } 1225 if (result != ISC_R_NOMORE) { 1226 goto failure; 1227 } 1228 success: 1229 result = ISC_R_SUCCESS; 1230 1231 failure: 1232 if (dns_rdataset_isassociated(&rdataset)) { 1233 dns_rdataset_disassociate(&rdataset); 1234 } 1235 dns_db_detachnode(db, &node); 1236 return result; 1237 } 1238 1239 isc_result_t 1240 dns_nsec3_addnsec3sx(dns_db_t *db, dns_dbversion_t *version, 1241 const dns_name_t *name, dns_ttl_t nsecttl, bool unsecure, 1242 dns_rdatatype_t type, dns_diff_t *diff) { 1243 dns_dbnode_t *node = NULL; 1244 dns_rdata_nsec3param_t nsec3param; 1245 dns_rdataset_t rdataset; 1246 dns_rdataset_t prdataset; 1247 isc_result_t result; 1248 1249 dns_rdataset_init(&rdataset); 1250 dns_rdataset_init(&prdataset); 1251 1252 /* 1253 * Find the NSEC3 parameters for this zone. 1254 */ 1255 result = dns_db_getoriginnode(db, &node); 1256 if (result != ISC_R_SUCCESS) { 1257 return result; 1258 } 1259 1260 result = dns_db_findrdataset(db, node, version, type, 0, 0, &prdataset, 1261 NULL); 1262 if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND) { 1263 goto failure; 1264 } 1265 1266 result = dns_db_findrdataset(db, node, version, 1267 dns_rdatatype_nsec3param, 0, 0, &rdataset, 1268 NULL); 1269 if (result == ISC_R_NOTFOUND) { 1270 goto try_private; 1271 } 1272 if (result != ISC_R_SUCCESS) { 1273 goto failure; 1274 } 1275 1276 /* 1277 * Update each active NSEC3 chain. 1278 */ 1279 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1280 result = dns_rdataset_next(&rdataset)) 1281 { 1282 dns_rdata_t rdata = DNS_RDATA_INIT; 1283 1284 dns_rdataset_current(&rdataset, &rdata); 1285 CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); 1286 1287 if (nsec3param.flags != 0) { 1288 continue; 1289 } 1290 1291 /* 1292 * We have a active chain. Update it. 1293 */ 1294 CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param, 1295 nsecttl, unsecure, diff)); 1296 } 1297 if (result != ISC_R_NOMORE) { 1298 goto failure; 1299 } 1300 1301 dns_rdataset_disassociate(&rdataset); 1302 1303 try_private: 1304 if (!dns_rdataset_isassociated(&prdataset)) { 1305 goto success; 1306 } 1307 /* 1308 * Update each active NSEC3 chain. 1309 */ 1310 for (result = dns_rdataset_first(&prdataset); result == ISC_R_SUCCESS; 1311 result = dns_rdataset_next(&prdataset)) 1312 { 1313 dns_rdata_t rdata1 = DNS_RDATA_INIT; 1314 dns_rdata_t rdata2 = DNS_RDATA_INIT; 1315 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 1316 1317 dns_rdataset_current(&prdataset, &rdata1); 1318 if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf, 1319 sizeof(buf))) 1320 { 1321 continue; 1322 } 1323 CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL)); 1324 1325 if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) { 1326 continue; 1327 } 1328 if (better_param(&prdataset, &rdata2)) { 1329 continue; 1330 } 1331 1332 /* 1333 * We have a active chain. Update it. 1334 */ 1335 CHECK(dns_nsec3_addnsec3(db, version, name, &nsec3param, 1336 nsecttl, unsecure, diff)); 1337 } 1338 if (result == ISC_R_NOMORE) { 1339 success: 1340 result = ISC_R_SUCCESS; 1341 } 1342 failure: 1343 if (dns_rdataset_isassociated(&rdataset)) { 1344 dns_rdataset_disassociate(&rdataset); 1345 } 1346 if (dns_rdataset_isassociated(&prdataset)) { 1347 dns_rdataset_disassociate(&prdataset); 1348 } 1349 if (node != NULL) { 1350 dns_db_detachnode(db, &node); 1351 } 1352 1353 return result; 1354 } 1355 1356 /*% 1357 * Determine whether any NSEC3 records that were associated with 1358 * 'name' should be deleted or if they should continue to exist. 1359 * true indicates they should be deleted. 1360 * false indicates they should be retained. 1361 */ 1362 static isc_result_t 1363 deleteit(dns_db_t *db, dns_dbversion_t *ver, const dns_name_t *name, 1364 bool *yesno) { 1365 isc_result_t result; 1366 dns_fixedname_t foundname; 1367 dns_fixedname_init(&foundname); 1368 1369 result = dns_db_find(db, name, ver, dns_rdatatype_any, 1370 DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD, 1371 (isc_stdtime_t)0, NULL, 1372 dns_fixedname_name(&foundname), NULL, NULL); 1373 if (result == DNS_R_EMPTYNAME || result == ISC_R_SUCCESS || 1374 result == DNS_R_ZONECUT) 1375 { 1376 *yesno = false; 1377 return ISC_R_SUCCESS; 1378 } 1379 if (result == DNS_R_GLUE || result == DNS_R_DNAME || 1380 result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) 1381 { 1382 *yesno = true; 1383 return ISC_R_SUCCESS; 1384 } 1385 /* 1386 * Silence compiler. 1387 */ 1388 *yesno = true; 1389 return result; 1390 } 1391 1392 isc_result_t 1393 dns_nsec3_delnsec3(dns_db_t *db, dns_dbversion_t *version, 1394 const dns_name_t *name, 1395 const dns_rdata_nsec3param_t *nsec3param, dns_diff_t *diff) { 1396 dns_dbiterator_t *dbit = NULL; 1397 dns_dbnode_t *node = NULL; 1398 dns_difftuple_t *tuple = NULL; 1399 dns_fixedname_t fixed; 1400 dns_fixedname_t fprev; 1401 dns_hash_t hash; 1402 dns_name_t *hashname; 1403 dns_name_t *origin; 1404 dns_name_t *prev; 1405 dns_name_t empty; 1406 dns_rdata_nsec3_t nsec3; 1407 dns_rdata_t rdata = DNS_RDATA_INIT; 1408 dns_rdataset_t rdataset; 1409 int pass; 1410 bool yesno; 1411 isc_buffer_t buffer; 1412 isc_result_t result; 1413 unsigned char *salt; 1414 unsigned char nexthash[NSEC3_MAX_HASH_LENGTH]; 1415 unsigned char nsec3buf[DNS_NSEC3_BUFFERSIZE]; 1416 unsigned int iterations; 1417 unsigned int labels; 1418 size_t next_length; 1419 unsigned int salt_length; 1420 1421 hashname = dns_fixedname_initname(&fixed); 1422 prev = dns_fixedname_initname(&fprev); 1423 1424 dns_rdataset_init(&rdataset); 1425 1426 origin = dns_db_origin(db); 1427 1428 /* 1429 * Chain parameters. 1430 */ 1431 hash = nsec3param->hash; 1432 iterations = nsec3param->iterations; 1433 salt_length = nsec3param->salt_length; 1434 salt = nsec3param->salt; 1435 1436 /* 1437 * If this is the first NSEC3 in the chain nexthash will 1438 * remain pointing to itself. 1439 */ 1440 next_length = sizeof(nexthash); 1441 CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, name, origin, 1442 hash, iterations, salt, salt_length)); 1443 1444 CHECK(dns_db_createiterator(db, DNS_DB_NSEC3ONLY, &dbit)); 1445 1446 result = dns_dbiterator_seek(dbit, hashname); 1447 if (result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH) { 1448 goto cleanup_orphaned_ents; 1449 } 1450 if (result != ISC_R_SUCCESS) { 1451 goto failure; 1452 } 1453 1454 CHECK(dns_dbiterator_current(dbit, &node, NULL)); 1455 CHECK(dns_dbiterator_pause(dbit)); 1456 result = dns_db_findrdataset(db, node, version, dns_rdatatype_nsec3, 0, 1457 (isc_stdtime_t)0, &rdataset, NULL); 1458 dns_db_detachnode(db, &node); 1459 if (result == ISC_R_NOTFOUND) { 1460 goto cleanup_orphaned_ents; 1461 } 1462 if (result != ISC_R_SUCCESS) { 1463 goto failure; 1464 } 1465 1466 /* 1467 * If we find a existing NSEC3 for this chain then save the 1468 * next field. 1469 */ 1470 result = find_nsec3(&nsec3, &rdataset, nsec3param); 1471 if (result == ISC_R_SUCCESS) { 1472 next_length = nsec3.next_length; 1473 INSIST(next_length <= sizeof(nexthash)); 1474 memmove(nexthash, nsec3.next, next_length); 1475 } 1476 dns_rdataset_disassociate(&rdataset); 1477 if (result == ISC_R_NOMORE) { 1478 goto success; 1479 } 1480 if (result != ISC_R_SUCCESS) { 1481 goto failure; 1482 } 1483 1484 /* 1485 * Find the previous NSEC3 and update it. 1486 */ 1487 pass = 0; 1488 do { 1489 result = dns_dbiterator_prev(dbit); 1490 if (result == ISC_R_NOMORE) { 1491 pass++; 1492 CHECK(dns_dbiterator_last(dbit)); 1493 } 1494 CHECK(dns_dbiterator_current(dbit, &node, prev)); 1495 CHECK(dns_dbiterator_pause(dbit)); 1496 result = dns_db_findrdataset(db, node, version, 1497 dns_rdatatype_nsec3, 0, 1498 (isc_stdtime_t)0, &rdataset, NULL); 1499 dns_db_detachnode(db, &node); 1500 if (result != ISC_R_SUCCESS) { 1501 continue; 1502 } 1503 result = find_nsec3(&nsec3, &rdataset, nsec3param); 1504 if (result == ISC_R_NOMORE) { 1505 dns_rdataset_disassociate(&rdataset); 1506 continue; 1507 } 1508 if (result != ISC_R_SUCCESS) { 1509 goto failure; 1510 } 1511 1512 /* 1513 * Delete the old previous NSEC3. 1514 */ 1515 CHECK(delnsec3(db, version, prev, nsec3param, diff)); 1516 1517 /* 1518 * Fixup the previous NSEC3. 1519 */ 1520 nsec3.next = nexthash; 1521 nsec3.next_length = (unsigned char)next_length; 1522 if (CREATE(nsec3param->flags)) { 1523 nsec3.flags = nsec3param->flags & DNS_NSEC3FLAG_OPTOUT; 1524 } 1525 isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf)); 1526 CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass, 1527 dns_rdatatype_nsec3, &nsec3, 1528 &buffer)); 1529 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, prev, 1530 rdataset.ttl, &rdata, &tuple)); 1531 CHECK(do_one_tuple(&tuple, db, version, diff)); 1532 dns_rdata_reset(&rdata); 1533 dns_rdataset_disassociate(&rdataset); 1534 break; 1535 } while (pass < 2); 1536 1537 /* 1538 * Delete the old NSEC3 and record the change. 1539 */ 1540 CHECK(delnsec3(db, version, hashname, nsec3param, diff)); 1541 1542 /* 1543 * Delete NSEC3 records for now non active nodes. 1544 */ 1545 cleanup_orphaned_ents: 1546 dns_name_init(&empty, NULL); 1547 dns_name_clone(name, &empty); 1548 do { 1549 labels = dns_name_countlabels(&empty) - 1; 1550 if (labels <= dns_name_countlabels(origin)) { 1551 break; 1552 } 1553 dns_name_getlabelsequence(&empty, 1, labels, &empty); 1554 CHECK(deleteit(db, version, &empty, &yesno)); 1555 if (!yesno) { 1556 break; 1557 } 1558 1559 CHECK(dns_nsec3_hashname(&fixed, nexthash, &next_length, &empty, 1560 origin, hash, iterations, salt, 1561 salt_length)); 1562 result = dns_dbiterator_seek(dbit, hashname); 1563 if (result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH) { 1564 goto success; 1565 } 1566 if (result != ISC_R_SUCCESS) { 1567 goto failure; 1568 } 1569 1570 CHECK(dns_dbiterator_current(dbit, &node, NULL)); 1571 CHECK(dns_dbiterator_pause(dbit)); 1572 result = dns_db_findrdataset(db, node, version, 1573 dns_rdatatype_nsec3, 0, 1574 (isc_stdtime_t)0, &rdataset, NULL); 1575 dns_db_detachnode(db, &node); 1576 if (result == ISC_R_NOTFOUND) { 1577 goto success; 1578 } 1579 if (result != ISC_R_SUCCESS) { 1580 goto failure; 1581 } 1582 1583 result = find_nsec3(&nsec3, &rdataset, nsec3param); 1584 if (result == ISC_R_SUCCESS) { 1585 next_length = nsec3.next_length; 1586 INSIST(next_length <= sizeof(nexthash)); 1587 memmove(nexthash, nsec3.next, next_length); 1588 } 1589 dns_rdataset_disassociate(&rdataset); 1590 if (result == ISC_R_NOMORE) { 1591 goto success; 1592 } 1593 if (result != ISC_R_SUCCESS) { 1594 goto failure; 1595 } 1596 1597 pass = 0; 1598 do { 1599 result = dns_dbiterator_prev(dbit); 1600 if (result == ISC_R_NOMORE) { 1601 pass++; 1602 CHECK(dns_dbiterator_last(dbit)); 1603 } 1604 CHECK(dns_dbiterator_current(dbit, &node, prev)); 1605 CHECK(dns_dbiterator_pause(dbit)); 1606 result = dns_db_findrdataset( 1607 db, node, version, dns_rdatatype_nsec3, 0, 1608 (isc_stdtime_t)0, &rdataset, NULL); 1609 dns_db_detachnode(db, &node); 1610 if (result != ISC_R_SUCCESS) { 1611 continue; 1612 } 1613 result = find_nsec3(&nsec3, &rdataset, nsec3param); 1614 if (result == ISC_R_NOMORE) { 1615 dns_rdataset_disassociate(&rdataset); 1616 continue; 1617 } 1618 if (result != ISC_R_SUCCESS) { 1619 goto failure; 1620 } 1621 1622 /* 1623 * Delete the old previous NSEC3. 1624 */ 1625 CHECK(delnsec3(db, version, prev, nsec3param, diff)); 1626 1627 /* 1628 * Fixup the previous NSEC3. 1629 */ 1630 nsec3.next = nexthash; 1631 nsec3.next_length = (unsigned char)next_length; 1632 isc_buffer_init(&buffer, nsec3buf, sizeof(nsec3buf)); 1633 CHECK(dns_rdata_fromstruct(&rdata, rdataset.rdclass, 1634 dns_rdatatype_nsec3, &nsec3, 1635 &buffer)); 1636 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 1637 prev, rdataset.ttl, &rdata, 1638 &tuple)); 1639 CHECK(do_one_tuple(&tuple, db, version, diff)); 1640 dns_rdata_reset(&rdata); 1641 dns_rdataset_disassociate(&rdataset); 1642 break; 1643 } while (pass < 2); 1644 1645 INSIST(pass < 2); 1646 1647 /* 1648 * Delete the old NSEC3 and record the change. 1649 */ 1650 CHECK(delnsec3(db, version, hashname, nsec3param, diff)); 1651 } while (1); 1652 1653 success: 1654 result = ISC_R_SUCCESS; 1655 1656 failure: 1657 if (dbit != NULL) { 1658 dns_dbiterator_destroy(&dbit); 1659 } 1660 if (dns_rdataset_isassociated(&rdataset)) { 1661 dns_rdataset_disassociate(&rdataset); 1662 } 1663 if (node != NULL) { 1664 dns_db_detachnode(db, &node); 1665 } 1666 return result; 1667 } 1668 1669 isc_result_t 1670 dns_nsec3_delnsec3s(dns_db_t *db, dns_dbversion_t *version, 1671 const dns_name_t *name, dns_diff_t *diff) { 1672 return dns_nsec3_delnsec3sx(db, version, name, 0, diff); 1673 } 1674 1675 isc_result_t 1676 dns_nsec3_delnsec3sx(dns_db_t *db, dns_dbversion_t *version, 1677 const dns_name_t *name, dns_rdatatype_t privatetype, 1678 dns_diff_t *diff) { 1679 dns_dbnode_t *node = NULL; 1680 dns_rdata_nsec3param_t nsec3param; 1681 dns_rdataset_t rdataset; 1682 isc_result_t result; 1683 1684 dns_rdataset_init(&rdataset); 1685 1686 /* 1687 * Find the NSEC3 parameters for this zone. 1688 */ 1689 result = dns_db_getoriginnode(db, &node); 1690 if (result != ISC_R_SUCCESS) { 1691 return result; 1692 } 1693 1694 result = dns_db_findrdataset(db, node, version, 1695 dns_rdatatype_nsec3param, 0, 0, &rdataset, 1696 NULL); 1697 if (result == ISC_R_NOTFOUND) { 1698 goto try_private; 1699 } 1700 if (result != ISC_R_SUCCESS) { 1701 goto failure; 1702 } 1703 1704 /* 1705 * Update each active NSEC3 chain. 1706 */ 1707 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1708 result = dns_rdataset_next(&rdataset)) 1709 { 1710 dns_rdata_t rdata = DNS_RDATA_INIT; 1711 1712 dns_rdataset_current(&rdataset, &rdata); 1713 CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); 1714 1715 if (nsec3param.flags != 0) { 1716 continue; 1717 } 1718 /* 1719 * We have a active chain. Update it. 1720 */ 1721 CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff)); 1722 } 1723 dns_rdataset_disassociate(&rdataset); 1724 1725 try_private: 1726 if (privatetype == 0) { 1727 goto success; 1728 } 1729 result = dns_db_findrdataset(db, node, version, privatetype, 0, 0, 1730 &rdataset, NULL); 1731 if (result == ISC_R_NOTFOUND) { 1732 goto success; 1733 } 1734 if (result != ISC_R_SUCCESS) { 1735 goto failure; 1736 } 1737 1738 /* 1739 * Update each NSEC3 chain being built. 1740 */ 1741 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1742 result = dns_rdataset_next(&rdataset)) 1743 { 1744 dns_rdata_t rdata1 = DNS_RDATA_INIT; 1745 dns_rdata_t rdata2 = DNS_RDATA_INIT; 1746 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 1747 1748 dns_rdataset_current(&rdataset, &rdata1); 1749 if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf, 1750 sizeof(buf))) 1751 { 1752 continue; 1753 } 1754 CHECK(dns_rdata_tostruct(&rdata2, &nsec3param, NULL)); 1755 1756 if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) { 1757 continue; 1758 } 1759 if (better_param(&rdataset, &rdata2)) { 1760 continue; 1761 } 1762 1763 /* 1764 * We have a active chain. Update it. 1765 */ 1766 CHECK(dns_nsec3_delnsec3(db, version, name, &nsec3param, diff)); 1767 } 1768 if (result == ISC_R_NOMORE) { 1769 success: 1770 result = ISC_R_SUCCESS; 1771 } 1772 1773 failure: 1774 if (dns_rdataset_isassociated(&rdataset)) { 1775 dns_rdataset_disassociate(&rdataset); 1776 } 1777 if (node != NULL) { 1778 dns_db_detachnode(db, &node); 1779 } 1780 1781 return result; 1782 } 1783 1784 isc_result_t 1785 dns_nsec3_active(dns_db_t *db, dns_dbversion_t *version, bool complete, 1786 bool *answer) { 1787 return dns_nsec3_activex(db, version, complete, 0, answer); 1788 } 1789 1790 isc_result_t 1791 dns_nsec3_activex(dns_db_t *db, dns_dbversion_t *version, bool complete, 1792 dns_rdatatype_t privatetype, bool *answer) { 1793 dns_dbnode_t *node = NULL; 1794 dns_rdataset_t rdataset; 1795 dns_rdata_nsec3param_t nsec3param; 1796 isc_result_t result; 1797 1798 REQUIRE(answer != NULL); 1799 1800 dns_rdataset_init(&rdataset); 1801 1802 result = dns_db_getoriginnode(db, &node); 1803 if (result != ISC_R_SUCCESS) { 1804 return result; 1805 } 1806 1807 result = dns_db_findrdataset(db, node, version, 1808 dns_rdatatype_nsec3param, 0, 0, &rdataset, 1809 NULL); 1810 1811 if (result == ISC_R_NOTFOUND) { 1812 goto try_private; 1813 } 1814 1815 if (result != ISC_R_SUCCESS) { 1816 dns_db_detachnode(db, &node); 1817 return result; 1818 } 1819 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1820 result = dns_rdataset_next(&rdataset)) 1821 { 1822 dns_rdata_t rdata = DNS_RDATA_INIT; 1823 1824 dns_rdataset_current(&rdataset, &rdata); 1825 result = dns_rdata_tostruct(&rdata, &nsec3param, NULL); 1826 RUNTIME_CHECK(result == ISC_R_SUCCESS); 1827 1828 if (nsec3param.flags == 0) { 1829 break; 1830 } 1831 } 1832 dns_rdataset_disassociate(&rdataset); 1833 if (result == ISC_R_SUCCESS) { 1834 dns_db_detachnode(db, &node); 1835 *answer = true; 1836 return ISC_R_SUCCESS; 1837 } 1838 if (result == ISC_R_NOMORE) { 1839 *answer = false; 1840 } 1841 1842 try_private: 1843 if (privatetype == 0 || complete) { 1844 dns_db_detachnode(db, &node); 1845 *answer = false; 1846 return ISC_R_SUCCESS; 1847 } 1848 result = dns_db_findrdataset(db, node, version, privatetype, 0, 0, 1849 &rdataset, NULL); 1850 1851 dns_db_detachnode(db, &node); 1852 if (result == ISC_R_NOTFOUND) { 1853 *answer = false; 1854 return ISC_R_SUCCESS; 1855 } 1856 if (result != ISC_R_SUCCESS) { 1857 return result; 1858 } 1859 1860 for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; 1861 result = dns_rdataset_next(&rdataset)) 1862 { 1863 dns_rdata_t rdata1 = DNS_RDATA_INIT; 1864 dns_rdata_t rdata2 = DNS_RDATA_INIT; 1865 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 1866 1867 dns_rdataset_current(&rdataset, &rdata1); 1868 if (!dns_nsec3param_fromprivate(&rdata1, &rdata2, buf, 1869 sizeof(buf))) 1870 { 1871 continue; 1872 } 1873 result = dns_rdata_tostruct(&rdata2, &nsec3param, NULL); 1874 RUNTIME_CHECK(result == ISC_R_SUCCESS); 1875 1876 if (!complete && CREATE(nsec3param.flags)) { 1877 break; 1878 } 1879 } 1880 dns_rdataset_disassociate(&rdataset); 1881 if (result == ISC_R_SUCCESS) { 1882 *answer = true; 1883 result = ISC_R_SUCCESS; 1884 } 1885 if (result == ISC_R_NOMORE) { 1886 *answer = false; 1887 result = ISC_R_SUCCESS; 1888 } 1889 1890 return result; 1891 } 1892 1893 unsigned int 1894 dns_nsec3_maxiterations(void) { 1895 return DNS_NSEC3_MAXITERATIONS; 1896 } 1897 1898 isc_result_t 1899 dns_nsec3_noexistnodata(dns_rdatatype_t type, const dns_name_t *name, 1900 const dns_name_t *nsec3name, dns_rdataset_t *nsec3set, 1901 dns_name_t *zonename, bool *exists, bool *data, 1902 bool *optout, bool *unknown, bool *setclosest, 1903 bool *setnearest, dns_name_t *closest, 1904 dns_name_t *nearest, dns_nseclog_t logit, void *arg) { 1905 char namebuf[DNS_NAME_FORMATSIZE]; 1906 dns_fixedname_t fzone; 1907 dns_fixedname_t qfixed; 1908 dns_label_t hashlabel; 1909 dns_name_t *qname; 1910 dns_name_t *zone; 1911 dns_rdata_nsec3_t nsec3; 1912 dns_rdata_t rdata = DNS_RDATA_INIT; 1913 int order; 1914 int scope; 1915 bool atparent; 1916 bool first; 1917 bool ns; 1918 bool soa; 1919 isc_buffer_t buffer; 1920 isc_result_t answer = ISC_R_IGNORE; 1921 isc_result_t result; 1922 unsigned char hash[NSEC3_MAX_HASH_LENGTH]; 1923 unsigned char owner[NSEC3_MAX_HASH_LENGTH]; 1924 unsigned int length; 1925 unsigned int qlabels; 1926 unsigned int zlabels; 1927 1928 REQUIRE((exists == NULL && data == NULL) || 1929 (exists != NULL && data != NULL)); 1930 REQUIRE(nsec3set != NULL && nsec3set->type == dns_rdatatype_nsec3); 1931 REQUIRE((setclosest == NULL && closest == NULL) || 1932 (setclosest != NULL && closest != NULL)); 1933 REQUIRE((setnearest == NULL && nearest == NULL) || 1934 (setnearest != NULL && nearest != NULL)); 1935 1936 result = dns_rdataset_first(nsec3set); 1937 if (result != ISC_R_SUCCESS) { 1938 (*logit)(arg, ISC_LOG_DEBUG(3), "failure processing NSEC3 set"); 1939 return result; 1940 } 1941 1942 dns_rdataset_current(nsec3set, &rdata); 1943 1944 result = dns_rdata_tostruct(&rdata, &nsec3, NULL); 1945 if (result != ISC_R_SUCCESS) { 1946 return result; 1947 } 1948 1949 (*logit)(arg, ISC_LOG_DEBUG(3), "looking for relevant NSEC3"); 1950 1951 zone = dns_fixedname_initname(&fzone); 1952 zlabels = dns_name_countlabels(nsec3name); 1953 1954 /* 1955 * NSEC3 records must have two or more labels to be valid. 1956 */ 1957 if (zlabels < 2) { 1958 return ISC_R_IGNORE; 1959 } 1960 1961 /* 1962 * Strip off the NSEC3 hash to get the zone. 1963 */ 1964 zlabels--; 1965 dns_name_split(nsec3name, zlabels, NULL, zone); 1966 1967 /* 1968 * If not below the zone name we can ignore this record. 1969 */ 1970 if (!dns_name_issubdomain(name, zone)) { 1971 return ISC_R_IGNORE; 1972 } 1973 1974 /* 1975 * Is this zone the same or deeper than the current zone? 1976 */ 1977 if (dns_name_countlabels(zonename) == 0 || 1978 dns_name_issubdomain(zone, zonename)) 1979 { 1980 dns_name_copy(zone, zonename); 1981 } 1982 1983 if (!dns_name_equal(zone, zonename)) { 1984 return ISC_R_IGNORE; 1985 } 1986 1987 /* 1988 * Are we only looking for the most enclosing zone? 1989 */ 1990 if (exists == NULL || data == NULL) { 1991 return ISC_R_SUCCESS; 1992 } 1993 1994 /* 1995 * Only set unknown once we are sure that this NSEC3 is from 1996 * the deepest covering zone. 1997 */ 1998 if (!dns_nsec3_supportedhash(nsec3.hash)) { 1999 if (unknown != NULL) { 2000 *unknown = true; 2001 } 2002 return ISC_R_IGNORE; 2003 } 2004 2005 /* 2006 * Recover the hash from the first label. 2007 */ 2008 dns_name_getlabel(nsec3name, 0, &hashlabel); 2009 isc_region_consume(&hashlabel, 1); 2010 isc_buffer_init(&buffer, owner, sizeof(owner)); 2011 result = isc_base32hex_decoderegion(&hashlabel, &buffer); 2012 if (result != ISC_R_SUCCESS) { 2013 return result; 2014 } 2015 2016 /* 2017 * The hash lengths should match. If not ignore the record. 2018 */ 2019 if (isc_buffer_usedlength(&buffer) != nsec3.next_length) { 2020 return ISC_R_IGNORE; 2021 } 2022 2023 /* 2024 * Work out what this NSEC3 covers. 2025 * Inside (<0) or outside (>=0). 2026 */ 2027 scope = memcmp(owner, nsec3.next, nsec3.next_length); 2028 2029 /* 2030 * Prepare to compute all the hashes. 2031 */ 2032 qname = dns_fixedname_initname(&qfixed); 2033 dns_name_downcase(name, qname, NULL); 2034 qlabels = dns_name_countlabels(qname); 2035 first = true; 2036 2037 while (qlabels >= zlabels) { 2038 /* 2039 * If there are too many iterations reject the NSEC3 record. 2040 */ 2041 if (nsec3.iterations > DNS_NSEC3_MAXITERATIONS) { 2042 return DNS_R_NSEC3ITERRANGE; 2043 } 2044 2045 length = isc_iterated_hash(hash, nsec3.hash, nsec3.iterations, 2046 nsec3.salt, nsec3.salt_length, 2047 qname->ndata, qname->length); 2048 /* 2049 * The computed hash length should match. 2050 */ 2051 if (length != nsec3.next_length) { 2052 (*logit)(arg, ISC_LOG_DEBUG(3), 2053 "ignoring NSEC bad length %u vs %u", length, 2054 nsec3.next_length); 2055 return ISC_R_IGNORE; 2056 } 2057 2058 order = memcmp(hash, owner, length); 2059 if (first && order == 0) { 2060 /* 2061 * The hashes are the same. 2062 */ 2063 atparent = dns_rdatatype_atparent(type); 2064 ns = dns_nsec3_typepresent(&rdata, dns_rdatatype_ns); 2065 soa = dns_nsec3_typepresent(&rdata, dns_rdatatype_soa); 2066 if (ns && !soa) { 2067 if (!atparent) { 2068 /* 2069 * This NSEC3 record is from somewhere 2070 * higher in the DNS, and at the 2071 * parent of a delegation. It can not 2072 * be legitimately used here. 2073 */ 2074 (*logit)(arg, ISC_LOG_DEBUG(3), 2075 "ignoring parent NSEC3"); 2076 return ISC_R_IGNORE; 2077 } 2078 } else if (atparent && ns && soa) { 2079 /* 2080 * This NSEC3 record is from the child. 2081 * It can not be legitimately used here. 2082 */ 2083 (*logit)(arg, ISC_LOG_DEBUG(3), 2084 "ignoring child NSEC3"); 2085 return ISC_R_IGNORE; 2086 } 2087 if (type == dns_rdatatype_cname || 2088 type == dns_rdatatype_nxt || 2089 type == dns_rdatatype_nsec || 2090 type == dns_rdatatype_key || 2091 !dns_nsec3_typepresent(&rdata, dns_rdatatype_cname)) 2092 { 2093 *exists = true; 2094 *data = dns_nsec3_typepresent(&rdata, type); 2095 (*logit)(arg, ISC_LOG_DEBUG(3), 2096 "NSEC3 proves name exists (owner) " 2097 "data=%d", 2098 *data); 2099 return ISC_R_SUCCESS; 2100 } 2101 (*logit)(arg, ISC_LOG_DEBUG(3), 2102 "NSEC3 proves CNAME exists"); 2103 return ISC_R_IGNORE; 2104 } 2105 2106 if (order == 0 && 2107 dns_nsec3_typepresent(&rdata, dns_rdatatype_ns) && 2108 !dns_nsec3_typepresent(&rdata, dns_rdatatype_soa)) 2109 { 2110 /* 2111 * This NSEC3 record is from somewhere higher in 2112 * the DNS, and at the parent of a delegation. 2113 * It can not be legitimately used here. 2114 */ 2115 (*logit)(arg, ISC_LOG_DEBUG(3), 2116 "ignoring parent NSEC3"); 2117 return ISC_R_IGNORE; 2118 } 2119 2120 /* 2121 * Potential closest encloser. 2122 */ 2123 if (order == 0) { 2124 if (closest != NULL && 2125 (dns_name_countlabels(closest) == 0 || 2126 dns_name_issubdomain(qname, closest)) && 2127 !dns_nsec3_typepresent(&rdata, dns_rdatatype_ds) && 2128 !dns_nsec3_typepresent(&rdata, 2129 dns_rdatatype_dname) && 2130 (dns_nsec3_typepresent(&rdata, dns_rdatatype_soa) || 2131 !dns_nsec3_typepresent(&rdata, dns_rdatatype_ns))) 2132 { 2133 dns_name_format(qname, namebuf, 2134 sizeof(namebuf)); 2135 (*logit)(arg, ISC_LOG_DEBUG(3), 2136 "NSEC3 indicates potential closest " 2137 "encloser: '%s'", 2138 namebuf); 2139 dns_name_copy(qname, closest); 2140 *setclosest = true; 2141 } 2142 dns_name_format(qname, namebuf, sizeof(namebuf)); 2143 (*logit)(arg, ISC_LOG_DEBUG(3), 2144 "NSEC3 at super-domain %s", namebuf); 2145 return answer; 2146 } 2147 2148 /* 2149 * Find if the name does not exist. 2150 * 2151 * We continue as we need to find the name closest to the 2152 * closest encloser that doesn't exist. 2153 * 2154 * We also need to continue to ensure that we are not 2155 * proving the non-existence of a record in a sub-zone. 2156 * If that would be the case we will return ISC_R_IGNORE 2157 * above. 2158 */ 2159 if ((scope < 0 && order > 0 && 2160 memcmp(hash, nsec3.next, length) < 0) || 2161 (scope >= 0 && 2162 (order > 0 || memcmp(hash, nsec3.next, length) < 0))) 2163 { 2164 dns_name_format(qname, namebuf, sizeof(namebuf)); 2165 (*logit)(arg, ISC_LOG_DEBUG(3), 2166 "NSEC3 proves " 2167 "name does not exist: '%s'", 2168 namebuf); 2169 if (nearest != NULL && 2170 (dns_name_countlabels(nearest) == 0 || 2171 dns_name_issubdomain(nearest, qname))) 2172 { 2173 dns_name_copy(qname, nearest); 2174 *setnearest = true; 2175 } 2176 2177 *exists = false; 2178 *data = false; 2179 if (optout != NULL) { 2180 *optout = ((nsec3.flags & 2181 DNS_NSEC3FLAG_OPTOUT) != 0); 2182 (*logit)(arg, ISC_LOG_DEBUG(3), 2183 (*optout ? "NSEC3 indicates optout" 2184 : "NSEC3 indicates secure " 2185 "range")); 2186 } 2187 answer = ISC_R_SUCCESS; 2188 } 2189 2190 qlabels--; 2191 if (qlabels > 0) { 2192 dns_name_split(qname, qlabels, NULL, qname); 2193 } 2194 first = false; 2195 } 2196 return answer; 2197 } 2198
Indexes created Sun Mar 01 05:31:48 UTC 2026