update.c revision 225736
1/* 2 * Copyright (C) 2004-2011 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 1999-2003 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* $Id: update.c,v 1.186.16.5 2011-03-25 23:53:52 each Exp $ */ 19 20#include <config.h> 21 22#include <isc/netaddr.h> 23#include <isc/print.h> 24#include <isc/serial.h> 25#include <isc/stats.h> 26#include <isc/string.h> 27#include <isc/taskpool.h> 28#include <isc/util.h> 29 30#include <dns/db.h> 31#include <dns/dbiterator.h> 32#include <dns/diff.h> 33#include <dns/dnssec.h> 34#include <dns/events.h> 35#include <dns/fixedname.h> 36#include <dns/journal.h> 37#include <dns/keyvalues.h> 38#include <dns/message.h> 39#include <dns/nsec.h> 40#include <dns/nsec3.h> 41#include <dns/private.h> 42#include <dns/rdataclass.h> 43#include <dns/rdataset.h> 44#include <dns/rdatasetiter.h> 45#include <dns/rdatastruct.h> 46#include <dns/rdatatype.h> 47#include <dns/soa.h> 48#include <dns/ssu.h> 49#include <dns/tsig.h> 50#include <dns/view.h> 51#include <dns/zone.h> 52#include <dns/zt.h> 53 54#include <named/client.h> 55#include <named/log.h> 56#include <named/server.h> 57#include <named/update.h> 58 59/*! \file 60 * \brief 61 * This module implements dynamic update as in RFC2136. 62 */ 63 64/* 65 * XXX TODO: 66 * - document strict minimality 67 */ 68 69/**************************************************************************/ 70 71/*% 72 * Log level for tracing dynamic update protocol requests. 73 */ 74#define LOGLEVEL_PROTOCOL ISC_LOG_INFO 75 76/*% 77 * Log level for low-level debug tracing. 78 */ 79#define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8) 80 81/*% 82 * Check an operation for failure. These macros all assume that 83 * the function using them has a 'result' variable and a 'failure' 84 * label. 85 */ 86#define CHECK(op) \ 87 do { result = (op); \ 88 if (result != ISC_R_SUCCESS) goto failure; \ 89 } while (0) 90 91/*% 92 * Fail unconditionally with result 'code', which must not 93 * be ISC_R_SUCCESS. The reason for failure presumably has 94 * been logged already. 95 * 96 * The test against ISC_R_SUCCESS is there to keep the Solaris compiler 97 * from complaining about "end-of-loop code not reached". 98 */ 99 100#define FAIL(code) \ 101 do { \ 102 result = (code); \ 103 if (result != ISC_R_SUCCESS) goto failure; \ 104 } while (0) 105 106/*% 107 * Fail unconditionally and log as a client error. 108 * The test against ISC_R_SUCCESS is there to keep the Solaris compiler 109 * from complaining about "end-of-loop code not reached". 110 */ 111#define FAILC(code, msg) \ 112 do { \ 113 const char *_what = "failed"; \ 114 result = (code); \ 115 switch (result) { \ 116 case DNS_R_NXDOMAIN: \ 117 case DNS_R_YXDOMAIN: \ 118 case DNS_R_YXRRSET: \ 119 case DNS_R_NXRRSET: \ 120 _what = "unsuccessful"; \ 121 } \ 122 update_log(client, zone, LOGLEVEL_PROTOCOL, \ 123 "update %s: %s (%s)", _what, \ 124 msg, isc_result_totext(result)); \ 125 if (result != ISC_R_SUCCESS) goto failure; \ 126 } while (0) 127#define PREREQFAILC(code, msg) \ 128 do { \ 129 inc_stats(zone, dns_nsstatscounter_updatebadprereq); \ 130 FAILC(code, msg); \ 131 } while (0) 132 133#define FAILN(code, name, msg) \ 134 do { \ 135 const char *_what = "failed"; \ 136 result = (code); \ 137 switch (result) { \ 138 case DNS_R_NXDOMAIN: \ 139 case DNS_R_YXDOMAIN: \ 140 case DNS_R_YXRRSET: \ 141 case DNS_R_NXRRSET: \ 142 _what = "unsuccessful"; \ 143 } \ 144 if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { \ 145 char _nbuf[DNS_NAME_FORMATSIZE]; \ 146 dns_name_format(name, _nbuf, sizeof(_nbuf)); \ 147 update_log(client, zone, LOGLEVEL_PROTOCOL, \ 148 "update %s: %s: %s (%s)", _what, _nbuf, \ 149 msg, isc_result_totext(result)); \ 150 } \ 151 if (result != ISC_R_SUCCESS) goto failure; \ 152 } while (0) 153#define PREREQFAILN(code, name, msg) \ 154 do { \ 155 inc_stats(zone, dns_nsstatscounter_updatebadprereq); \ 156 FAILN(code, name, msg); \ 157 } while (0) 158 159#define FAILNT(code, name, type, msg) \ 160 do { \ 161 const char *_what = "failed"; \ 162 result = (code); \ 163 switch (result) { \ 164 case DNS_R_NXDOMAIN: \ 165 case DNS_R_YXDOMAIN: \ 166 case DNS_R_YXRRSET: \ 167 case DNS_R_NXRRSET: \ 168 _what = "unsuccessful"; \ 169 } \ 170 if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { \ 171 char _nbuf[DNS_NAME_FORMATSIZE]; \ 172 char _tbuf[DNS_RDATATYPE_FORMATSIZE]; \ 173 dns_name_format(name, _nbuf, sizeof(_nbuf)); \ 174 dns_rdatatype_format(type, _tbuf, sizeof(_tbuf)); \ 175 update_log(client, zone, LOGLEVEL_PROTOCOL, \ 176 "update %s: %s/%s: %s (%s)", \ 177 _what, _nbuf, _tbuf, msg, \ 178 isc_result_totext(result)); \ 179 } \ 180 if (result != ISC_R_SUCCESS) goto failure; \ 181 } while (0) 182#define PREREQFAILNT(code, name, type, msg) \ 183 do { \ 184 inc_stats(zone, dns_nsstatscounter_updatebadprereq); \ 185 FAILNT(code, name, type, msg); \ 186 } while (0) 187 188/*% 189 * Fail unconditionally and log as a server error. 190 * The test against ISC_R_SUCCESS is there to keep the Solaris compiler 191 * from complaining about "end-of-loop code not reached". 192 */ 193#define FAILS(code, msg) \ 194 do { \ 195 result = (code); \ 196 update_log(client, zone, LOGLEVEL_PROTOCOL, \ 197 "error: %s: %s", \ 198 msg, isc_result_totext(result)); \ 199 if (result != ISC_R_SUCCESS) goto failure; \ 200 } while (0) 201 202/* 203 * Return TRUE if NS_CLIENTATTR_TCP is set in the attributes other FALSE. 204 */ 205#define TCPCLIENT(client) (((client)->attributes & NS_CLIENTATTR_TCP) != 0) 206 207/**************************************************************************/ 208 209typedef struct rr rr_t; 210 211struct rr { 212 /* dns_name_t name; */ 213 isc_uint32_t ttl; 214 dns_rdata_t rdata; 215}; 216 217typedef struct update_event update_event_t; 218 219struct update_event { 220 ISC_EVENT_COMMON(update_event_t); 221 dns_zone_t *zone; 222 isc_result_t result; 223 dns_message_t *answer; 224}; 225 226/**************************************************************************/ 227/* 228 * Forward declarations. 229 */ 230 231static void update_action(isc_task_t *task, isc_event_t *event); 232static void updatedone_action(isc_task_t *task, isc_event_t *event); 233static isc_result_t send_forward_event(ns_client_t *client, dns_zone_t *zone); 234static void forward_done(isc_task_t *task, isc_event_t *event); 235 236/**************************************************************************/ 237 238static void 239update_log(ns_client_t *client, dns_zone_t *zone, 240 int level, const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5); 241 242static void 243update_log(ns_client_t *client, dns_zone_t *zone, 244 int level, const char *fmt, ...) 245{ 246 va_list ap; 247 char message[4096]; 248 char namebuf[DNS_NAME_FORMATSIZE]; 249 char classbuf[DNS_RDATACLASS_FORMATSIZE]; 250 251 if (client == NULL || zone == NULL) 252 return; 253 254 if (isc_log_wouldlog(ns_g_lctx, level) == ISC_FALSE) 255 return; 256 257 dns_name_format(dns_zone_getorigin(zone), namebuf, 258 sizeof(namebuf)); 259 dns_rdataclass_format(dns_zone_getclass(zone), classbuf, 260 sizeof(classbuf)); 261 262 va_start(ap, fmt); 263 vsnprintf(message, sizeof(message), fmt, ap); 264 va_end(ap); 265 266 ns_client_log(client, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, 267 level, "updating zone '%s/%s': %s", 268 namebuf, classbuf, message); 269} 270 271/*% 272 * Increment updated-related statistics counters. 273 */ 274static inline void 275inc_stats(dns_zone_t *zone, isc_statscounter_t counter) { 276 isc_stats_increment(ns_g_server->nsstats, counter); 277 278 if (zone != NULL) { 279 isc_stats_t *zonestats = dns_zone_getrequeststats(zone); 280 if (zonestats != NULL) 281 isc_stats_increment(zonestats, counter); 282 } 283} 284 285/*% 286 * Check if we could have queried for the contents of this zone or 287 * if the zone is potentially updateable. 288 * If the zone can potentially be updated and the check failed then 289 * log a error otherwise we log a informational message. 290 */ 291static isc_result_t 292checkqueryacl(ns_client_t *client, dns_acl_t *queryacl, dns_name_t *zonename, 293 dns_acl_t *updateacl, dns_ssutable_t *ssutable) 294{ 295 char namebuf[DNS_NAME_FORMATSIZE]; 296 char classbuf[DNS_RDATACLASS_FORMATSIZE]; 297 int level; 298 isc_result_t result; 299 300 result = ns_client_checkaclsilent(client, NULL, queryacl, ISC_TRUE); 301 if (result != ISC_R_SUCCESS) { 302 dns_name_format(zonename, namebuf, sizeof(namebuf)); 303 dns_rdataclass_format(client->view->rdclass, classbuf, 304 sizeof(classbuf)); 305 306 level = (updateacl == NULL && ssutable == NULL) ? 307 ISC_LOG_INFO : ISC_LOG_ERROR; 308 309 ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, 310 NS_LOGMODULE_UPDATE, level, 311 "update '%s/%s' denied due to allow-query", 312 namebuf, classbuf); 313 } else if (updateacl == NULL && ssutable == NULL) { 314 dns_name_format(zonename, namebuf, sizeof(namebuf)); 315 dns_rdataclass_format(client->view->rdclass, classbuf, 316 sizeof(classbuf)); 317 318 result = DNS_R_REFUSED; 319 ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, 320 NS_LOGMODULE_UPDATE, ISC_LOG_INFO, 321 "update '%s/%s' denied", namebuf, classbuf); 322 } 323 return (result); 324} 325 326/*% 327 * Override the default acl logging when checking whether a client 328 * can update the zone or whether we can forward the request to the 329 * master based on IP address. 330 * 331 * 'message' contains the type of operation that is being attempted. 332 * 'slave' indicates if this is a slave zone. If 'acl' is NULL then 333 * log at debug=3. 334 * If the zone has no access controls configured ('acl' == NULL && 335 * 'has_ssutable == ISC_FALS) log the attempt at info, otherwise 336 * at error. 337 * 338 * If the request was signed log that we received it. 339 */ 340static isc_result_t 341checkupdateacl(ns_client_t *client, dns_acl_t *acl, const char *message, 342 dns_name_t *zonename, isc_boolean_t slave, 343 isc_boolean_t has_ssutable) 344{ 345 char namebuf[DNS_NAME_FORMATSIZE]; 346 char classbuf[DNS_RDATACLASS_FORMATSIZE]; 347 int level = ISC_LOG_ERROR; 348 const char *msg = "denied"; 349 isc_result_t result; 350 351 if (slave && acl == NULL) { 352 result = DNS_R_NOTIMP; 353 level = ISC_LOG_DEBUG(3); 354 msg = "disabled"; 355 } else { 356 result = ns_client_checkaclsilent(client, NULL, acl, ISC_FALSE); 357 if (result == ISC_R_SUCCESS) { 358 level = ISC_LOG_DEBUG(3); 359 msg = "approved"; 360 } else if (acl == NULL && !has_ssutable) { 361 level = ISC_LOG_INFO; 362 } 363 } 364 365 if (client->signer != NULL) { 366 dns_name_format(client->signer, namebuf, sizeof(namebuf)); 367 ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, 368 NS_LOGMODULE_UPDATE, ISC_LOG_INFO, 369 "signer \"%s\" %s", namebuf, msg); 370 } 371 372 dns_name_format(zonename, namebuf, sizeof(namebuf)); 373 dns_rdataclass_format(client->view->rdclass, classbuf, 374 sizeof(classbuf)); 375 376 ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, 377 NS_LOGMODULE_UPDATE, level, "%s '%s/%s' %s", 378 message, namebuf, classbuf, msg); 379 return (result); 380} 381 382/*% 383 * Update a single RR in version 'ver' of 'db' and log the 384 * update in 'diff'. 385 * 386 * Ensures: 387 * \li '*tuple' == NULL. Either the tuple is freed, or its 388 * ownership has been transferred to the diff. 389 */ 390static isc_result_t 391do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver, 392 dns_diff_t *diff) 393{ 394 dns_diff_t temp_diff; 395 isc_result_t result; 396 397 /* 398 * Create a singleton diff. 399 */ 400 dns_diff_init(diff->mctx, &temp_diff); 401 temp_diff.resign = diff->resign; 402 ISC_LIST_APPEND(temp_diff.tuples, *tuple, link); 403 404 /* 405 * Apply it to the database. 406 */ 407 result = dns_diff_apply(&temp_diff, db, ver); 408 ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link); 409 if (result != ISC_R_SUCCESS) { 410 dns_difftuple_free(tuple); 411 return (result); 412 } 413 414 /* 415 * Merge it into the current pending journal entry. 416 */ 417 dns_diff_appendminimal(diff, tuple); 418 419 /* 420 * Do not clear temp_diff. 421 */ 422 return (ISC_R_SUCCESS); 423} 424 425/*% 426 * Perform the updates in 'updates' in version 'ver' of 'db' and log the 427 * update in 'diff'. 428 * 429 * Ensures: 430 * \li 'updates' is empty. 431 */ 432static isc_result_t 433do_diff(dns_diff_t *updates, dns_db_t *db, dns_dbversion_t *ver, 434 dns_diff_t *diff) 435{ 436 isc_result_t result; 437 while (! ISC_LIST_EMPTY(updates->tuples)) { 438 dns_difftuple_t *t = ISC_LIST_HEAD(updates->tuples); 439 ISC_LIST_UNLINK(updates->tuples, t, link); 440 CHECK(do_one_tuple(&t, db, ver, diff)); 441 } 442 return (ISC_R_SUCCESS); 443 444 failure: 445 dns_diff_clear(diff); 446 return (result); 447} 448 449static isc_result_t 450update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff, 451 dns_diffop_t op, dns_name_t *name, dns_ttl_t ttl, 452 dns_rdata_t *rdata) 453{ 454 dns_difftuple_t *tuple = NULL; 455 isc_result_t result; 456 result = dns_difftuple_create(diff->mctx, op, 457 name, ttl, rdata, &tuple); 458 if (result != ISC_R_SUCCESS) 459 return (result); 460 return (do_one_tuple(&tuple, db, ver, diff)); 461} 462 463/**************************************************************************/ 464/* 465 * Callback-style iteration over rdatasets and rdatas. 466 * 467 * foreach_rrset() can be used to iterate over the RRsets 468 * of a name and call a callback function with each 469 * one. Similarly, foreach_rr() can be used to iterate 470 * over the individual RRs at name, optionally restricted 471 * to RRs of a given type. 472 * 473 * The callback functions are called "actions" and take 474 * two arguments: a void pointer for passing arbitrary 475 * context information, and a pointer to the current RRset 476 * or RR. By convention, their names end in "_action". 477 */ 478 479/* 480 * XXXRTH We might want to make this public somewhere in libdns. 481 */ 482 483/*% 484 * Function type for foreach_rrset() iterator actions. 485 */ 486typedef isc_result_t rrset_func(void *data, dns_rdataset_t *rrset); 487 488/*% 489 * Function type for foreach_rr() iterator actions. 490 */ 491typedef isc_result_t rr_func(void *data, rr_t *rr); 492 493/*% 494 * Internal context struct for foreach_node_rr(). 495 */ 496typedef struct { 497 rr_func * rr_action; 498 void * rr_action_data; 499} foreach_node_rr_ctx_t; 500 501/*% 502 * Internal helper function for foreach_node_rr(). 503 */ 504static isc_result_t 505foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) { 506 isc_result_t result; 507 foreach_node_rr_ctx_t *ctx = data; 508 for (result = dns_rdataset_first(rdataset); 509 result == ISC_R_SUCCESS; 510 result = dns_rdataset_next(rdataset)) 511 { 512 rr_t rr = { 0, DNS_RDATA_INIT }; 513 514 dns_rdataset_current(rdataset, &rr.rdata); 515 rr.ttl = rdataset->ttl; 516 result = (*ctx->rr_action)(ctx->rr_action_data, &rr); 517 if (result != ISC_R_SUCCESS) 518 return (result); 519 } 520 if (result != ISC_R_NOMORE) 521 return (result); 522 return (ISC_R_SUCCESS); 523} 524 525/*% 526 * For each rdataset of 'name' in 'ver' of 'db', call 'action' 527 * with the rdataset and 'action_data' as arguments. If the name 528 * does not exist, do nothing. 529 * 530 * If 'action' returns an error, abort iteration and return the error. 531 */ 532static isc_result_t 533foreach_rrset(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 534 rrset_func *action, void *action_data) 535{ 536 isc_result_t result; 537 dns_dbnode_t *node; 538 dns_rdatasetiter_t *iter; 539 540 node = NULL; 541 result = dns_db_findnode(db, name, ISC_FALSE, &node); 542 if (result == ISC_R_NOTFOUND) 543 return (ISC_R_SUCCESS); 544 if (result != ISC_R_SUCCESS) 545 return (result); 546 547 iter = NULL; 548 result = dns_db_allrdatasets(db, node, ver, 549 (isc_stdtime_t) 0, &iter); 550 if (result != ISC_R_SUCCESS) 551 goto cleanup_node; 552 553 for (result = dns_rdatasetiter_first(iter); 554 result == ISC_R_SUCCESS; 555 result = dns_rdatasetiter_next(iter)) 556 { 557 dns_rdataset_t rdataset; 558 559 dns_rdataset_init(&rdataset); 560 dns_rdatasetiter_current(iter, &rdataset); 561 562 result = (*action)(action_data, &rdataset); 563 564 dns_rdataset_disassociate(&rdataset); 565 if (result != ISC_R_SUCCESS) 566 goto cleanup_iterator; 567 } 568 if (result == ISC_R_NOMORE) 569 result = ISC_R_SUCCESS; 570 571 cleanup_iterator: 572 dns_rdatasetiter_destroy(&iter); 573 574 cleanup_node: 575 dns_db_detachnode(db, &node); 576 577 return (result); 578} 579 580/*% 581 * For each RR of 'name' in 'ver' of 'db', call 'action' 582 * with the RR and 'action_data' as arguments. If the name 583 * does not exist, do nothing. 584 * 585 * If 'action' returns an error, abort iteration 586 * and return the error. 587 */ 588static isc_result_t 589foreach_node_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 590 rr_func *rr_action, void *rr_action_data) 591{ 592 foreach_node_rr_ctx_t ctx; 593 ctx.rr_action = rr_action; 594 ctx.rr_action_data = rr_action_data; 595 return (foreach_rrset(db, ver, name, 596 foreach_node_rr_action, &ctx)); 597} 598 599 600/*% 601 * For each of the RRs specified by 'db', 'ver', 'name', 'type', 602 * (which can be dns_rdatatype_any to match any type), and 'covers', call 603 * 'action' with the RR and 'action_data' as arguments. If the name 604 * does not exist, or if no RRset of the given type exists at the name, 605 * do nothing. 606 * 607 * If 'action' returns an error, abort iteration and return the error. 608 */ 609static isc_result_t 610foreach_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 611 dns_rdatatype_t type, dns_rdatatype_t covers, rr_func *rr_action, 612 void *rr_action_data) 613{ 614 615 isc_result_t result; 616 dns_dbnode_t *node; 617 dns_rdataset_t rdataset; 618 619 if (type == dns_rdatatype_any) 620 return (foreach_node_rr(db, ver, name, 621 rr_action, rr_action_data)); 622 623 node = NULL; 624 if (type == dns_rdatatype_nsec3 || 625 (type == dns_rdatatype_rrsig && covers == dns_rdatatype_nsec3)) 626 result = dns_db_findnsec3node(db, name, ISC_FALSE, &node); 627 else 628 result = dns_db_findnode(db, name, ISC_FALSE, &node); 629 if (result == ISC_R_NOTFOUND) 630 return (ISC_R_SUCCESS); 631 if (result != ISC_R_SUCCESS) 632 return (result); 633 634 dns_rdataset_init(&rdataset); 635 result = dns_db_findrdataset(db, node, ver, type, covers, 636 (isc_stdtime_t) 0, &rdataset, NULL); 637 if (result == ISC_R_NOTFOUND) { 638 result = ISC_R_SUCCESS; 639 goto cleanup_node; 640 } 641 if (result != ISC_R_SUCCESS) 642 goto cleanup_node; 643 644 for (result = dns_rdataset_first(&rdataset); 645 result == ISC_R_SUCCESS; 646 result = dns_rdataset_next(&rdataset)) 647 { 648 rr_t rr = { 0, DNS_RDATA_INIT }; 649 dns_rdataset_current(&rdataset, &rr.rdata); 650 rr.ttl = rdataset.ttl; 651 result = (*rr_action)(rr_action_data, &rr); 652 if (result != ISC_R_SUCCESS) 653 goto cleanup_rdataset; 654 } 655 if (result != ISC_R_NOMORE) 656 goto cleanup_rdataset; 657 result = ISC_R_SUCCESS; 658 659 cleanup_rdataset: 660 dns_rdataset_disassociate(&rdataset); 661 cleanup_node: 662 dns_db_detachnode(db, &node); 663 664 return (result); 665} 666 667/**************************************************************************/ 668/* 669 * Various tests on the database contents (for prerequisites, etc). 670 */ 671 672/*% 673 * Function type for predicate functions that compare a database RR 'db_rr' 674 * against an update RR 'update_rr'. 675 */ 676typedef isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr); 677 678/*% 679 * Helper function for rrset_exists(). 680 */ 681static isc_result_t 682rrset_exists_action(void *data, rr_t *rr) { 683 UNUSED(data); 684 UNUSED(rr); 685 return (ISC_R_EXISTS); 686} 687 688/*% 689 * Utility macro for RR existence checking functions. 690 * 691 * If the variable 'result' has the value ISC_R_EXISTS or 692 * ISC_R_SUCCESS, set *exists to ISC_TRUE or ISC_FALSE, 693 * respectively, and return success. 694 * 695 * If 'result' has any other value, there was a failure. 696 * Return the failure result code and do not set *exists. 697 * 698 * This would be more readable as "do { if ... } while(0)", 699 * but that form generates tons of warnings on Solaris 2.6. 700 */ 701#define RETURN_EXISTENCE_FLAG \ 702 return ((result == ISC_R_EXISTS) ? \ 703 (*exists = ISC_TRUE, ISC_R_SUCCESS) : \ 704 ((result == ISC_R_SUCCESS) ? \ 705 (*exists = ISC_FALSE, ISC_R_SUCCESS) : \ 706 result)) 707 708/*% 709 * Set '*exists' to true iff an rrset of the given type exists, 710 * to false otherwise. 711 */ 712static isc_result_t 713rrset_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 714 dns_rdatatype_t type, dns_rdatatype_t covers, 715 isc_boolean_t *exists) 716{ 717 isc_result_t result; 718 result = foreach_rr(db, ver, name, type, covers, 719 rrset_exists_action, NULL); 720 RETURN_EXISTENCE_FLAG; 721} 722 723/*% 724 * Set '*visible' to true if the RRset exists and is part of the 725 * visible zone. Otherwise '*visible' is set to false unless a 726 * error occurs. 727 */ 728static isc_result_t 729rrset_visible(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 730 dns_rdatatype_t type, isc_boolean_t *visible) 731{ 732 isc_result_t result; 733 dns_fixedname_t fixed; 734 735 dns_fixedname_init(&fixed); 736 result = dns_db_find(db, name, ver, type, DNS_DBFIND_NOWILD, 737 (isc_stdtime_t) 0, NULL, 738 dns_fixedname_name(&fixed), NULL, NULL); 739 switch (result) { 740 case ISC_R_SUCCESS: 741 *visible = ISC_TRUE; 742 break; 743 /* 744 * Glue, obscured, deleted or replaced records. 745 */ 746 case DNS_R_DELEGATION: 747 case DNS_R_DNAME: 748 case DNS_R_CNAME: 749 case DNS_R_NXDOMAIN: 750 case DNS_R_NXRRSET: 751 case DNS_R_EMPTYNAME: 752 case DNS_R_COVERINGNSEC: 753 *visible = ISC_FALSE; 754 result = ISC_R_SUCCESS; 755 break; 756 default: 757 break; 758 } 759 return (result); 760} 761 762/*% 763 * Helper function for cname_incompatible_rrset_exists. 764 */ 765static isc_result_t 766cname_compatibility_action(void *data, dns_rdataset_t *rrset) { 767 UNUSED(data); 768 if (rrset->type != dns_rdatatype_cname && 769 ! dns_rdatatype_isdnssec(rrset->type)) 770 return (ISC_R_EXISTS); 771 return (ISC_R_SUCCESS); 772} 773 774/*% 775 * Check whether there is an rrset incompatible with adding a CNAME RR, 776 * i.e., anything but another CNAME (which can be replaced) or a 777 * DNSSEC RR (which can coexist). 778 * 779 * If such an incompatible rrset exists, set '*exists' to ISC_TRUE. 780 * Otherwise, set it to ISC_FALSE. 781 */ 782static isc_result_t 783cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, 784 dns_name_t *name, isc_boolean_t *exists) { 785 isc_result_t result; 786 result = foreach_rrset(db, ver, name, 787 cname_compatibility_action, NULL); 788 RETURN_EXISTENCE_FLAG; 789} 790 791/*% 792 * Helper function for rr_count(). 793 */ 794static isc_result_t 795count_rr_action(void *data, rr_t *rr) { 796 int *countp = data; 797 UNUSED(rr); 798 (*countp)++; 799 return (ISC_R_SUCCESS); 800} 801 802/*% 803 * Count the number of RRs of 'type' belonging to 'name' in 'ver' of 'db'. 804 */ 805static isc_result_t 806rr_count(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 807 dns_rdatatype_t type, dns_rdatatype_t covers, int *countp) 808{ 809 *countp = 0; 810 return (foreach_rr(db, ver, name, type, covers, 811 count_rr_action, countp)); 812} 813 814/*% 815 * Context struct and helper function for name_exists(). 816 */ 817 818static isc_result_t 819name_exists_action(void *data, dns_rdataset_t *rrset) { 820 UNUSED(data); 821 UNUSED(rrset); 822 return (ISC_R_EXISTS); 823} 824 825/*% 826 * Set '*exists' to true iff the given name exists, to false otherwise. 827 */ 828static isc_result_t 829name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 830 isc_boolean_t *exists) 831{ 832 isc_result_t result; 833 result = foreach_rrset(db, ver, name, 834 name_exists_action, NULL); 835 RETURN_EXISTENCE_FLAG; 836} 837 838/* 839 * 'ssu_check_t' is used to pass the arguments to 840 * dns_ssutable_checkrules() to the callback function 841 * ssu_checkrule(). 842 */ 843typedef struct { 844 /* The ownername of the record to be updated. */ 845 dns_name_t *name; 846 847 /* The signature's name if the request was signed. */ 848 dns_name_t *signer; 849 850 /* The address of the client if the request was received via TCP. */ 851 isc_netaddr_t *tcpaddr; 852 853 /* The ssu table to check against. */ 854 dns_ssutable_t *table; 855 856 /* the key used for TKEY requests */ 857 dst_key_t *key; 858} ssu_check_t; 859 860static isc_result_t 861ssu_checkrule(void *data, dns_rdataset_t *rrset) { 862 ssu_check_t *ssuinfo = data; 863 isc_boolean_t result; 864 865 /* 866 * If we're deleting all records, it's ok to delete RRSIG and NSEC even 867 * if we're normally not allowed to. 868 */ 869 if (rrset->type == dns_rdatatype_rrsig || 870 rrset->type == dns_rdatatype_nsec) 871 return (ISC_R_SUCCESS); 872 result = dns_ssutable_checkrules(ssuinfo->table, ssuinfo->signer, 873 ssuinfo->name, ssuinfo->tcpaddr, 874 rrset->type, ssuinfo->key); 875 return (result == ISC_TRUE ? ISC_R_SUCCESS : ISC_R_FAILURE); 876} 877 878static isc_boolean_t 879ssu_checkall(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 880 dns_ssutable_t *ssutable, dns_name_t *signer, 881 isc_netaddr_t *tcpaddr, dst_key_t *key) 882{ 883 isc_result_t result; 884 ssu_check_t ssuinfo; 885 886 ssuinfo.name = name; 887 ssuinfo.table = ssutable; 888 ssuinfo.signer = signer; 889 ssuinfo.tcpaddr = tcpaddr; 890 ssuinfo.key = key; 891 result = foreach_rrset(db, ver, name, ssu_checkrule, &ssuinfo); 892 return (ISC_TF(result == ISC_R_SUCCESS)); 893} 894 895/**************************************************************************/ 896/* 897 * Checking of "RRset exists (value dependent)" prerequisites. 898 * 899 * In the RFC2136 section 3.2.5, this is the pseudocode involving 900 * a variable called "temp", a mapping of <name, type> tuples to rrsets. 901 * 902 * Here, we represent the "temp" data structure as (non-minimal) "dns_diff_t" 903 * where each tuple has op==DNS_DIFFOP_EXISTS. 904 */ 905 906 907/*% 908 * Append a tuple asserting the existence of the RR with 909 * 'name' and 'rdata' to 'diff'. 910 */ 911static isc_result_t 912temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata) { 913 isc_result_t result; 914 dns_difftuple_t *tuple = NULL; 915 916 REQUIRE(DNS_DIFF_VALID(diff)); 917 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS, 918 name, 0, rdata, &tuple)); 919 ISC_LIST_APPEND(diff->tuples, tuple, link); 920 failure: 921 return (result); 922} 923 924/*% 925 * Compare two rdatasets represented as sorted lists of tuples. 926 * All list elements must have the same owner name and type. 927 * Return ISC_R_SUCCESS if the rdatasets are equal, rcode(dns_rcode_nxrrset) 928 * if not. 929 */ 930static isc_result_t 931temp_check_rrset(dns_difftuple_t *a, dns_difftuple_t *b) { 932 for (;;) { 933 if (a == NULL || b == NULL) 934 break; 935 INSIST(a->op == DNS_DIFFOP_EXISTS && 936 b->op == DNS_DIFFOP_EXISTS); 937 INSIST(a->rdata.type == b->rdata.type); 938 INSIST(dns_name_equal(&a->name, &b->name)); 939 if (dns_rdata_casecompare(&a->rdata, &b->rdata) != 0) 940 return (DNS_R_NXRRSET); 941 a = ISC_LIST_NEXT(a, link); 942 b = ISC_LIST_NEXT(b, link); 943 } 944 if (a != NULL || b != NULL) 945 return (DNS_R_NXRRSET); 946 return (ISC_R_SUCCESS); 947} 948 949/*% 950 * A comparison function defining the sorting order for the entries 951 * in the "temp" data structure. The major sort key is the owner name, 952 * followed by the type and rdata. 953 */ 954static int 955temp_order(const void *av, const void *bv) { 956 dns_difftuple_t const * const *ap = av; 957 dns_difftuple_t const * const *bp = bv; 958 dns_difftuple_t const *a = *ap; 959 dns_difftuple_t const *b = *bp; 960 int r; 961 r = dns_name_compare(&a->name, &b->name); 962 if (r != 0) 963 return (r); 964 r = (b->rdata.type - a->rdata.type); 965 if (r != 0) 966 return (r); 967 r = dns_rdata_casecompare(&a->rdata, &b->rdata); 968 return (r); 969} 970 971/*% 972 * Check the "RRset exists (value dependent)" prerequisite information 973 * in 'temp' against the contents of the database 'db'. 974 * 975 * Return ISC_R_SUCCESS if the prerequisites are satisfied, 976 * rcode(dns_rcode_nxrrset) if not. 977 * 978 * 'temp' must be pre-sorted. 979 */ 980 981static isc_result_t 982temp_check(isc_mem_t *mctx, dns_diff_t *temp, dns_db_t *db, 983 dns_dbversion_t *ver, dns_name_t *tmpname, dns_rdatatype_t *typep) 984{ 985 isc_result_t result; 986 dns_name_t *name; 987 dns_dbnode_t *node; 988 dns_difftuple_t *t; 989 dns_diff_t trash; 990 991 dns_diff_init(mctx, &trash); 992 993 /* 994 * For each name and type in the prerequisites, 995 * construct a sorted rdata list of the corresponding 996 * database contents, and compare the lists. 997 */ 998 t = ISC_LIST_HEAD(temp->tuples); 999 while (t != NULL) { 1000 name = &t->name; 1001 (void)dns_name_copy(name, tmpname, NULL); 1002 *typep = t->rdata.type; 1003 1004 /* A new unique name begins here. */ 1005 node = NULL; 1006 result = dns_db_findnode(db, name, ISC_FALSE, &node); 1007 if (result == ISC_R_NOTFOUND) { 1008 dns_diff_clear(&trash); 1009 return (DNS_R_NXRRSET); 1010 } 1011 if (result != ISC_R_SUCCESS) { 1012 dns_diff_clear(&trash); 1013 return (result); 1014 } 1015 1016 /* A new unique type begins here. */ 1017 while (t != NULL && dns_name_equal(&t->name, name)) { 1018 dns_rdatatype_t type, covers; 1019 dns_rdataset_t rdataset; 1020 dns_diff_t d_rrs; /* Database RRs with 1021 this name and type */ 1022 dns_diff_t u_rrs; /* Update RRs with 1023 this name and type */ 1024 1025 *typep = type = t->rdata.type; 1026 if (type == dns_rdatatype_rrsig || 1027 type == dns_rdatatype_sig) 1028 covers = dns_rdata_covers(&t->rdata); 1029 else if (type == dns_rdatatype_any) { 1030 dns_db_detachnode(db, &node); 1031 dns_diff_clear(&trash); 1032 return (DNS_R_NXRRSET); 1033 } else 1034 covers = 0; 1035 1036 /* 1037 * Collect all database RRs for this name and type 1038 * onto d_rrs and sort them. 1039 */ 1040 dns_rdataset_init(&rdataset); 1041 result = dns_db_findrdataset(db, node, ver, type, 1042 covers, (isc_stdtime_t) 0, 1043 &rdataset, NULL); 1044 if (result != ISC_R_SUCCESS) { 1045 dns_db_detachnode(db, &node); 1046 dns_diff_clear(&trash); 1047 return (DNS_R_NXRRSET); 1048 } 1049 1050 dns_diff_init(mctx, &d_rrs); 1051 dns_diff_init(mctx, &u_rrs); 1052 1053 for (result = dns_rdataset_first(&rdataset); 1054 result == ISC_R_SUCCESS; 1055 result = dns_rdataset_next(&rdataset)) 1056 { 1057 dns_rdata_t rdata = DNS_RDATA_INIT; 1058 dns_rdataset_current(&rdataset, &rdata); 1059 result = temp_append(&d_rrs, name, &rdata); 1060 if (result != ISC_R_SUCCESS) 1061 goto failure; 1062 } 1063 if (result != ISC_R_NOMORE) 1064 goto failure; 1065 result = dns_diff_sort(&d_rrs, temp_order); 1066 if (result != ISC_R_SUCCESS) 1067 goto failure; 1068 1069 /* 1070 * Collect all update RRs for this name and type 1071 * onto u_rrs. No need to sort them here - 1072 * they are already sorted. 1073 */ 1074 while (t != NULL && 1075 dns_name_equal(&t->name, name) && 1076 t->rdata.type == type) 1077 { 1078 dns_difftuple_t *next = 1079 ISC_LIST_NEXT(t, link); 1080 ISC_LIST_UNLINK(temp->tuples, t, link); 1081 ISC_LIST_APPEND(u_rrs.tuples, t, link); 1082 t = next; 1083 } 1084 1085 /* Compare the two sorted lists. */ 1086 result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples), 1087 ISC_LIST_HEAD(d_rrs.tuples)); 1088 if (result != ISC_R_SUCCESS) 1089 goto failure; 1090 1091 /* 1092 * We are done with the tuples, but we can't free 1093 * them yet because "name" still points into one 1094 * of them. Move them on a temporary list. 1095 */ 1096 ISC_LIST_APPENDLIST(trash.tuples, u_rrs.tuples, link); 1097 ISC_LIST_APPENDLIST(trash.tuples, d_rrs.tuples, link); 1098 dns_rdataset_disassociate(&rdataset); 1099 1100 continue; 1101 1102 failure: 1103 dns_diff_clear(&d_rrs); 1104 dns_diff_clear(&u_rrs); 1105 dns_diff_clear(&trash); 1106 dns_rdataset_disassociate(&rdataset); 1107 dns_db_detachnode(db, &node); 1108 return (result); 1109 } 1110 1111 dns_db_detachnode(db, &node); 1112 } 1113 1114 dns_diff_clear(&trash); 1115 return (ISC_R_SUCCESS); 1116} 1117 1118/**************************************************************************/ 1119/* 1120 * Conditional deletion of RRs. 1121 */ 1122 1123/*% 1124 * Context structure for delete_if(). 1125 */ 1126 1127typedef struct { 1128 rr_predicate *predicate; 1129 dns_db_t *db; 1130 dns_dbversion_t *ver; 1131 dns_diff_t *diff; 1132 dns_name_t *name; 1133 dns_rdata_t *update_rr; 1134} conditional_delete_ctx_t; 1135 1136/*% 1137 * Predicate functions for delete_if(). 1138 */ 1139 1140/*% 1141 * Return true iff 'db_rr' is neither a SOA nor an NS RR nor 1142 * an RRSIG nor an NSEC3PARAM nor a NSEC. 1143 */ 1144static isc_boolean_t 1145type_not_soa_nor_ns_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1146 UNUSED(update_rr); 1147 return ((db_rr->type != dns_rdatatype_soa && 1148 db_rr->type != dns_rdatatype_ns && 1149 db_rr->type != dns_rdatatype_nsec3param && 1150 db_rr->type != dns_rdatatype_rrsig && 1151 db_rr->type != dns_rdatatype_nsec) ? 1152 ISC_TRUE : ISC_FALSE); 1153} 1154 1155/*% 1156 * Return true iff 'db_rr' is neither a RRSIG nor a NSEC. 1157 */ 1158static isc_boolean_t 1159type_not_dnssec(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1160 UNUSED(update_rr); 1161 return ((db_rr->type != dns_rdatatype_rrsig && 1162 db_rr->type != dns_rdatatype_nsec) ? 1163 ISC_TRUE : ISC_FALSE); 1164} 1165 1166/*% 1167 * Return true always. 1168 */ 1169static isc_boolean_t 1170true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1171 UNUSED(update_rr); 1172 UNUSED(db_rr); 1173 return (ISC_TRUE); 1174} 1175 1176/*% 1177 * Return true if the record is a RRSIG. 1178 */ 1179static isc_boolean_t 1180rrsig_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1181 UNUSED(update_rr); 1182 return ((db_rr->type == dns_rdatatype_rrsig) ? 1183 ISC_TRUE : ISC_FALSE); 1184} 1185 1186/*% 1187 * Return true iff the two RRs have identical rdata. 1188 */ 1189static isc_boolean_t 1190rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1191 /* 1192 * XXXRTH This is not a problem, but we should consider creating 1193 * dns_rdata_equal() (that used dns_name_equal()), since it 1194 * would be faster. Not a priority. 1195 */ 1196 return (dns_rdata_casecompare(update_rr, db_rr) == 0 ? 1197 ISC_TRUE : ISC_FALSE); 1198} 1199 1200/*% 1201 * Return true iff 'update_rr' should replace 'db_rr' according 1202 * to the special RFC2136 rules for CNAME, SOA, and WKS records. 1203 * 1204 * RFC2136 does not mention NSEC or DNAME, but multiple NSECs or DNAMEs 1205 * make little sense, so we replace those, too. 1206 * 1207 * Additionally replace RRSIG that have been generated by the same key 1208 * for the same type. This simplifies refreshing a offline KSK by not 1209 * requiring that the old RRSIG be deleted. It also simplifies key 1210 * rollover by only requiring that the new RRSIG be added. 1211 */ 1212static isc_boolean_t 1213replaces_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { 1214 dns_rdata_rrsig_t updatesig, dbsig; 1215 isc_result_t result; 1216 1217 if (db_rr->type != update_rr->type) 1218 return (ISC_FALSE); 1219 if (db_rr->type == dns_rdatatype_cname) 1220 return (ISC_TRUE); 1221 if (db_rr->type == dns_rdatatype_dname) 1222 return (ISC_TRUE); 1223 if (db_rr->type == dns_rdatatype_soa) 1224 return (ISC_TRUE); 1225 if (db_rr->type == dns_rdatatype_nsec) 1226 return (ISC_TRUE); 1227 if (db_rr->type == dns_rdatatype_rrsig) { 1228 /* 1229 * Replace existing RRSIG with the same keyid, 1230 * covered and algorithm. 1231 */ 1232 result = dns_rdata_tostruct(db_rr, &dbsig, NULL); 1233 RUNTIME_CHECK(result == ISC_R_SUCCESS); 1234 result = dns_rdata_tostruct(update_rr, &updatesig, NULL); 1235 RUNTIME_CHECK(result == ISC_R_SUCCESS); 1236 if (dbsig.keyid == updatesig.keyid && 1237 dbsig.covered == updatesig.covered && 1238 dbsig.algorithm == updatesig.algorithm) 1239 return (ISC_TRUE); 1240 } 1241 if (db_rr->type == dns_rdatatype_wks) { 1242 /* 1243 * Compare the address and protocol fields only. These 1244 * form the first five bytes of the RR data. Do a 1245 * raw binary comparison; unpacking the WKS RRs using 1246 * dns_rdata_tostruct() might be cleaner in some ways. 1247 */ 1248 INSIST(db_rr->length >= 5 && update_rr->length >= 5); 1249 return (memcmp(db_rr->data, update_rr->data, 5) == 0 ? 1250 ISC_TRUE : ISC_FALSE); 1251 } 1252 1253 if (db_rr->type == dns_rdatatype_nsec3param) { 1254 if (db_rr->length != update_rr->length) 1255 return (ISC_FALSE); 1256 INSIST(db_rr->length >= 4 && update_rr->length >= 4); 1257 /* 1258 * Replace NSEC3PARAM records that only differ by the 1259 * flags field. 1260 */ 1261 if (db_rr->data[0] == update_rr->data[0] && 1262 memcmp(db_rr->data+2, update_rr->data+2, 1263 update_rr->length - 2) == 0) 1264 return (ISC_TRUE); 1265 } 1266 return (ISC_FALSE); 1267} 1268 1269/*% 1270 * Internal helper function for delete_if(). 1271 */ 1272static isc_result_t 1273delete_if_action(void *data, rr_t *rr) { 1274 conditional_delete_ctx_t *ctx = data; 1275 if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) { 1276 isc_result_t result; 1277 result = update_one_rr(ctx->db, ctx->ver, ctx->diff, 1278 DNS_DIFFOP_DEL, ctx->name, 1279 rr->ttl, &rr->rdata); 1280 return (result); 1281 } else { 1282 return (ISC_R_SUCCESS); 1283 } 1284} 1285 1286/*% 1287 * Conditionally delete RRs. Apply 'predicate' to the RRs 1288 * specified by 'db', 'ver', 'name', and 'type' (which can 1289 * be dns_rdatatype_any to match any type). Delete those 1290 * RRs for which the predicate returns true, and log the 1291 * deletions in 'diff'. 1292 */ 1293static isc_result_t 1294delete_if(rr_predicate *predicate, dns_db_t *db, dns_dbversion_t *ver, 1295 dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, 1296 dns_rdata_t *update_rr, dns_diff_t *diff) 1297{ 1298 conditional_delete_ctx_t ctx; 1299 ctx.predicate = predicate; 1300 ctx.db = db; 1301 ctx.ver = ver; 1302 ctx.diff = diff; 1303 ctx.name = name; 1304 ctx.update_rr = update_rr; 1305 return (foreach_rr(db, ver, name, type, covers, 1306 delete_if_action, &ctx)); 1307} 1308 1309/**************************************************************************/ 1310/*% 1311 * Prepare an RR for the addition of the new RR 'ctx->update_rr', 1312 * with TTL 'ctx->update_rr_ttl', to its rdataset, by deleting 1313 * the RRs if it is replaced by the new RR or has a conflicting TTL. 1314 * The necessary changes are appended to ctx->del_diff and ctx->add_diff; 1315 * we need to do all deletions before any additions so that we don't run 1316 * into transient states with conflicting TTLs. 1317 */ 1318 1319typedef struct { 1320 dns_db_t *db; 1321 dns_dbversion_t *ver; 1322 dns_diff_t *diff; 1323 dns_name_t *name; 1324 dns_rdata_t *update_rr; 1325 dns_ttl_t update_rr_ttl; 1326 isc_boolean_t ignore_add; 1327 dns_diff_t del_diff; 1328 dns_diff_t add_diff; 1329} add_rr_prepare_ctx_t; 1330 1331static isc_result_t 1332add_rr_prepare_action(void *data, rr_t *rr) { 1333 isc_result_t result = ISC_R_SUCCESS; 1334 add_rr_prepare_ctx_t *ctx = data; 1335 dns_difftuple_t *tuple = NULL; 1336 isc_boolean_t equal; 1337 1338 /* 1339 * If the update RR is a "duplicate" of the update RR, 1340 * the update should be silently ignored. 1341 */ 1342 equal = ISC_TF(dns_rdata_casecompare(&rr->rdata, ctx->update_rr) == 0); 1343 if (equal && rr->ttl == ctx->update_rr_ttl) { 1344 ctx->ignore_add = ISC_TRUE; 1345 return (ISC_R_SUCCESS); 1346 } 1347 1348 /* 1349 * If this RR is "equal" to the update RR, it should 1350 * be deleted before the update RR is added. 1351 */ 1352 if (replaces_p(ctx->update_rr, &rr->rdata)) { 1353 CHECK(dns_difftuple_create(ctx->del_diff.mctx, DNS_DIFFOP_DEL, 1354 ctx->name, rr->ttl, &rr->rdata, 1355 &tuple)); 1356 dns_diff_append(&ctx->del_diff, &tuple); 1357 return (ISC_R_SUCCESS); 1358 } 1359 1360 /* 1361 * If this RR differs in TTL from the update RR, 1362 * its TTL must be adjusted. 1363 */ 1364 if (rr->ttl != ctx->update_rr_ttl) { 1365 CHECK(dns_difftuple_create(ctx->del_diff.mctx, DNS_DIFFOP_DEL, 1366 ctx->name, rr->ttl, &rr->rdata, 1367 &tuple)); 1368 dns_diff_append(&ctx->del_diff, &tuple); 1369 if (!equal) { 1370 CHECK(dns_difftuple_create(ctx->add_diff.mctx, 1371 DNS_DIFFOP_ADD, ctx->name, 1372 ctx->update_rr_ttl, 1373 &rr->rdata, &tuple)); 1374 dns_diff_append(&ctx->add_diff, &tuple); 1375 } 1376 } 1377 failure: 1378 return (result); 1379} 1380 1381/**************************************************************************/ 1382/* 1383 * Miscellaneous subroutines. 1384 */ 1385 1386/*% 1387 * Extract a single update RR from 'section' of dynamic update message 1388 * 'msg', with consistency checking. 1389 * 1390 * Stores the owner name, rdata, and TTL of the update RR at 'name', 1391 * 'rdata', and 'ttl', respectively. 1392 */ 1393static void 1394get_current_rr(dns_message_t *msg, dns_section_t section, 1395 dns_rdataclass_t zoneclass, dns_name_t **name, 1396 dns_rdata_t *rdata, dns_rdatatype_t *covers, 1397 dns_ttl_t *ttl, dns_rdataclass_t *update_class) 1398{ 1399 dns_rdataset_t *rdataset; 1400 isc_result_t result; 1401 dns_message_currentname(msg, section, name); 1402 rdataset = ISC_LIST_HEAD((*name)->list); 1403 INSIST(rdataset != NULL); 1404 INSIST(ISC_LIST_NEXT(rdataset, link) == NULL); 1405 *covers = rdataset->covers; 1406 *ttl = rdataset->ttl; 1407 result = dns_rdataset_first(rdataset); 1408 INSIST(result == ISC_R_SUCCESS); 1409 dns_rdataset_current(rdataset, rdata); 1410 INSIST(dns_rdataset_next(rdataset) == ISC_R_NOMORE); 1411 *update_class = rdata->rdclass; 1412 rdata->rdclass = zoneclass; 1413} 1414 1415/*% 1416 * Increment the SOA serial number of database 'db', version 'ver'. 1417 * Replace the SOA record in the database, and log the 1418 * change in 'diff'. 1419 */ 1420 1421 /* 1422 * XXXRTH Failures in this routine will be worth logging, when 1423 * we have a logging system. Failure to find the zonename 1424 * or the SOA rdataset warrant at least an UNEXPECTED_ERROR(). 1425 */ 1426 1427static isc_result_t 1428increment_soa_serial(dns_db_t *db, dns_dbversion_t *ver, 1429 dns_diff_t *diff, isc_mem_t *mctx) 1430{ 1431 dns_difftuple_t *deltuple = NULL; 1432 dns_difftuple_t *addtuple = NULL; 1433 isc_uint32_t serial; 1434 isc_result_t result; 1435 1436 CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_DEL, &deltuple)); 1437 CHECK(dns_difftuple_copy(deltuple, &addtuple)); 1438 addtuple->op = DNS_DIFFOP_ADD; 1439 1440 serial = dns_soa_getserial(&addtuple->rdata); 1441 1442 /* RFC1982 */ 1443 serial = (serial + 1) & 0xFFFFFFFF; 1444 if (serial == 0) 1445 serial = 1; 1446 1447 dns_soa_setserial(serial, &addtuple->rdata); 1448 CHECK(do_one_tuple(&deltuple, db, ver, diff)); 1449 CHECK(do_one_tuple(&addtuple, db, ver, diff)); 1450 result = ISC_R_SUCCESS; 1451 1452 failure: 1453 if (addtuple != NULL) 1454 dns_difftuple_free(&addtuple); 1455 if (deltuple != NULL) 1456 dns_difftuple_free(&deltuple); 1457 return (result); 1458} 1459 1460/*% 1461 * Check that the new SOA record at 'update_rdata' does not 1462 * illegally cause the SOA serial number to decrease or stay 1463 * unchanged relative to the existing SOA in 'db'. 1464 * 1465 * Sets '*ok' to ISC_TRUE if the update is legal, ISC_FALSE if not. 1466 * 1467 * William King points out that RFC2136 is inconsistent about 1468 * the case where the serial number stays unchanged: 1469 * 1470 * section 3.4.2.2 requires a server to ignore a SOA update request 1471 * if the serial number on the update SOA is less_than_or_equal to 1472 * the zone SOA serial. 1473 * 1474 * section 3.6 requires a server to ignore a SOA update request if 1475 * the serial is less_than the zone SOA serial. 1476 * 1477 * Paul says 3.4.2.2 is correct. 1478 * 1479 */ 1480static isc_result_t 1481check_soa_increment(dns_db_t *db, dns_dbversion_t *ver, 1482 dns_rdata_t *update_rdata, isc_boolean_t *ok) 1483{ 1484 isc_uint32_t db_serial; 1485 isc_uint32_t update_serial; 1486 isc_result_t result; 1487 1488 update_serial = dns_soa_getserial(update_rdata); 1489 1490 result = dns_db_getsoaserial(db, ver, &db_serial); 1491 if (result != ISC_R_SUCCESS) 1492 return (result); 1493 1494 if (DNS_SERIAL_GE(db_serial, update_serial)) { 1495 *ok = ISC_FALSE; 1496 } else { 1497 *ok = ISC_TRUE; 1498 } 1499 1500 return (ISC_R_SUCCESS); 1501 1502} 1503 1504/**************************************************************************/ 1505/* 1506 * Incremental updating of NSECs and RRSIGs. 1507 */ 1508 1509#define MAXZONEKEYS 32 /*%< Maximum number of zone keys supported. */ 1510 1511/*% 1512 * We abuse the dns_diff_t type to represent a set of domain names 1513 * affected by the update. 1514 */ 1515static isc_result_t 1516namelist_append_name(dns_diff_t *list, dns_name_t *name) { 1517 isc_result_t result; 1518 dns_difftuple_t *tuple = NULL; 1519 static dns_rdata_t dummy_rdata = DNS_RDATA_INIT; 1520 1521 CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0, 1522 &dummy_rdata, &tuple)); 1523 dns_diff_append(list, &tuple); 1524 failure: 1525 return (result); 1526} 1527 1528static isc_result_t 1529namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected) 1530{ 1531 isc_result_t result; 1532 dns_fixedname_t fixedname; 1533 dns_name_t *child; 1534 dns_dbiterator_t *dbit = NULL; 1535 1536 dns_fixedname_init(&fixedname); 1537 child = dns_fixedname_name(&fixedname); 1538 1539 CHECK(dns_db_createiterator(db, DNS_DB_NONSEC3, &dbit)); 1540 1541 for (result = dns_dbiterator_seek(dbit, name); 1542 result == ISC_R_SUCCESS; 1543 result = dns_dbiterator_next(dbit)) 1544 { 1545 dns_dbnode_t *node = NULL; 1546 CHECK(dns_dbiterator_current(dbit, &node, child)); 1547 dns_db_detachnode(db, &node); 1548 if (! dns_name_issubdomain(child, name)) 1549 break; 1550 CHECK(namelist_append_name(affected, child)); 1551 } 1552 if (result == ISC_R_NOMORE) 1553 result = ISC_R_SUCCESS; 1554 failure: 1555 if (dbit != NULL) 1556 dns_dbiterator_destroy(&dbit); 1557 return (result); 1558} 1559 1560 1561 1562/*% 1563 * Helper function for non_nsec_rrset_exists(). 1564 */ 1565static isc_result_t 1566is_non_nsec_action(void *data, dns_rdataset_t *rrset) { 1567 UNUSED(data); 1568 if (!(rrset->type == dns_rdatatype_nsec || 1569 rrset->type == dns_rdatatype_nsec3 || 1570 (rrset->type == dns_rdatatype_rrsig && 1571 (rrset->covers == dns_rdatatype_nsec || 1572 rrset->covers == dns_rdatatype_nsec3)))) 1573 return (ISC_R_EXISTS); 1574 return (ISC_R_SUCCESS); 1575} 1576 1577/*% 1578 * Check whether there is an rrset other than a NSEC or RRSIG NSEC, 1579 * i.e., anything that justifies the continued existence of a name 1580 * after a secure update. 1581 * 1582 * If such an rrset exists, set '*exists' to ISC_TRUE. 1583 * Otherwise, set it to ISC_FALSE. 1584 */ 1585static isc_result_t 1586non_nsec_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, 1587 dns_name_t *name, isc_boolean_t *exists) 1588{ 1589 isc_result_t result; 1590 result = foreach_rrset(db, ver, name, is_non_nsec_action, NULL); 1591 RETURN_EXISTENCE_FLAG; 1592} 1593 1594/*% 1595 * A comparison function for sorting dns_diff_t:s by name. 1596 */ 1597static int 1598name_order(const void *av, const void *bv) { 1599 dns_difftuple_t const * const *ap = av; 1600 dns_difftuple_t const * const *bp = bv; 1601 dns_difftuple_t const *a = *ap; 1602 dns_difftuple_t const *b = *bp; 1603 return (dns_name_compare(&a->name, &b->name)); 1604} 1605 1606static isc_result_t 1607uniqify_name_list(dns_diff_t *list) { 1608 isc_result_t result; 1609 dns_difftuple_t *p, *q; 1610 1611 CHECK(dns_diff_sort(list, name_order)); 1612 1613 p = ISC_LIST_HEAD(list->tuples); 1614 while (p != NULL) { 1615 do { 1616 q = ISC_LIST_NEXT(p, link); 1617 if (q == NULL || ! dns_name_equal(&p->name, &q->name)) 1618 break; 1619 ISC_LIST_UNLINK(list->tuples, q, link); 1620 dns_difftuple_free(&q); 1621 } while (1); 1622 p = ISC_LIST_NEXT(p, link); 1623 } 1624 failure: 1625 return (result); 1626} 1627 1628static isc_result_t 1629is_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 1630 isc_boolean_t *flag, isc_boolean_t *cut, isc_boolean_t *unsecure) 1631{ 1632 isc_result_t result; 1633 dns_fixedname_t foundname; 1634 dns_fixedname_init(&foundname); 1635 result = dns_db_find(db, name, ver, dns_rdatatype_any, 1636 DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD, 1637 (isc_stdtime_t) 0, NULL, 1638 dns_fixedname_name(&foundname), 1639 NULL, NULL); 1640 if (result == ISC_R_SUCCESS || result == DNS_R_EMPTYNAME) { 1641 *flag = ISC_TRUE; 1642 *cut = ISC_FALSE; 1643 if (unsecure != NULL) 1644 *unsecure = ISC_FALSE; 1645 return (ISC_R_SUCCESS); 1646 } else if (result == DNS_R_ZONECUT) { 1647 *flag = ISC_TRUE; 1648 *cut = ISC_TRUE; 1649 if (unsecure != NULL) { 1650 /* 1651 * We are at the zonecut. Check to see if there 1652 * is a DS RRset. 1653 */ 1654 if (dns_db_find(db, name, ver, dns_rdatatype_ds, 0, 1655 (isc_stdtime_t) 0, NULL, 1656 dns_fixedname_name(&foundname), 1657 NULL, NULL) == DNS_R_NXRRSET) 1658 *unsecure = ISC_TRUE; 1659 else 1660 *unsecure = ISC_FALSE; 1661 } 1662 return (ISC_R_SUCCESS); 1663 } else if (result == DNS_R_GLUE || result == DNS_R_DNAME || 1664 result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) { 1665 *flag = ISC_FALSE; 1666 *cut = ISC_FALSE; 1667 if (unsecure != NULL) 1668 *unsecure = ISC_FALSE; 1669 return (ISC_R_SUCCESS); 1670 } else { 1671 /* 1672 * Silence compiler. 1673 */ 1674 *flag = ISC_FALSE; 1675 *cut = ISC_FALSE; 1676 if (unsecure != NULL) 1677 *unsecure = ISC_FALSE; 1678 return (result); 1679 } 1680} 1681 1682/*% 1683 * Find the next/previous name that has a NSEC record. 1684 * In other words, skip empty database nodes and names that 1685 * have had their NSECs removed because they are obscured by 1686 * a zone cut. 1687 */ 1688static isc_result_t 1689next_active(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 1690 dns_dbversion_t *ver, dns_name_t *oldname, dns_name_t *newname, 1691 isc_boolean_t forward) 1692{ 1693 isc_result_t result; 1694 dns_dbiterator_t *dbit = NULL; 1695 isc_boolean_t has_nsec = ISC_FALSE; 1696 unsigned int wraps = 0; 1697 isc_boolean_t secure = dns_db_issecure(db); 1698 1699 CHECK(dns_db_createiterator(db, 0, &dbit)); 1700 1701 CHECK(dns_dbiterator_seek(dbit, oldname)); 1702 do { 1703 dns_dbnode_t *node = NULL; 1704 1705 if (forward) 1706 result = dns_dbiterator_next(dbit); 1707 else 1708 result = dns_dbiterator_prev(dbit); 1709 if (result == ISC_R_NOMORE) { 1710 /* 1711 * Wrap around. 1712 */ 1713 if (forward) 1714 CHECK(dns_dbiterator_first(dbit)); 1715 else 1716 CHECK(dns_dbiterator_last(dbit)); 1717 wraps++; 1718 if (wraps == 2) { 1719 update_log(client, zone, ISC_LOG_ERROR, 1720 "secure zone with no NSECs"); 1721 result = DNS_R_BADZONE; 1722 goto failure; 1723 } 1724 } 1725 CHECK(dns_dbiterator_current(dbit, &node, newname)); 1726 dns_db_detachnode(db, &node); 1727 1728 /* 1729 * The iterator may hold the tree lock, and 1730 * rrset_exists() calls dns_db_findnode() which 1731 * may try to reacquire it. To avoid deadlock 1732 * we must pause the iterator first. 1733 */ 1734 CHECK(dns_dbiterator_pause(dbit)); 1735 if (secure) { 1736 CHECK(rrset_exists(db, ver, newname, 1737 dns_rdatatype_nsec, 0, &has_nsec)); 1738 } else { 1739 dns_fixedname_t ffound; 1740 dns_name_t *found; 1741 dns_fixedname_init(&ffound); 1742 found = dns_fixedname_name(&ffound); 1743 result = dns_db_find(db, newname, ver, 1744 dns_rdatatype_soa, 1745 DNS_DBFIND_NOWILD, 0, NULL, found, 1746 NULL, NULL); 1747 if (result == ISC_R_SUCCESS || 1748 result == DNS_R_EMPTYNAME || 1749 result == DNS_R_NXRRSET || 1750 result == DNS_R_CNAME || 1751 (result == DNS_R_DELEGATION && 1752 dns_name_equal(newname, found))) { 1753 has_nsec = ISC_TRUE; 1754 result = ISC_R_SUCCESS; 1755 } else if (result != DNS_R_NXDOMAIN) 1756 break; 1757 } 1758 } while (! has_nsec); 1759 failure: 1760 if (dbit != NULL) 1761 dns_dbiterator_destroy(&dbit); 1762 1763 return (result); 1764} 1765 1766/*% 1767 * Add a NSEC record for "name", recording the change in "diff". 1768 * The existing NSEC is removed. 1769 */ 1770static isc_result_t 1771add_nsec(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 1772 dns_dbversion_t *ver, dns_name_t *name, dns_ttl_t nsecttl, 1773 dns_diff_t *diff) 1774{ 1775 isc_result_t result; 1776 dns_dbnode_t *node = NULL; 1777 unsigned char buffer[DNS_NSEC_BUFFERSIZE]; 1778 dns_rdata_t rdata = DNS_RDATA_INIT; 1779 dns_difftuple_t *tuple = NULL; 1780 dns_fixedname_t fixedname; 1781 dns_name_t *target; 1782 1783 dns_fixedname_init(&fixedname); 1784 target = dns_fixedname_name(&fixedname); 1785 1786 /* 1787 * Find the successor name, aka NSEC target. 1788 */ 1789 CHECK(next_active(client, zone, db, ver, name, target, ISC_TRUE)); 1790 1791 /* 1792 * Create the NSEC RDATA. 1793 */ 1794 CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); 1795 dns_rdata_init(&rdata); 1796 CHECK(dns_nsec_buildrdata(db, ver, node, target, buffer, &rdata)); 1797 dns_db_detachnode(db, &node); 1798 1799 /* 1800 * Delete the old NSEC and record the change. 1801 */ 1802 CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nsec, 0, 1803 NULL, diff)); 1804 /* 1805 * Add the new NSEC and record the change. 1806 */ 1807 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 1808 nsecttl, &rdata, &tuple)); 1809 CHECK(do_one_tuple(&tuple, db, ver, diff)); 1810 INSIST(tuple == NULL); 1811 1812 failure: 1813 if (node != NULL) 1814 dns_db_detachnode(db, &node); 1815 return (result); 1816} 1817 1818/*% 1819 * Add a placeholder NSEC record for "name", recording the change in "diff". 1820 */ 1821static isc_result_t 1822add_placeholder_nsec(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 1823 dns_diff_t *diff) 1824{ 1825 isc_result_t result; 1826 dns_difftuple_t *tuple = NULL; 1827 isc_region_t r; 1828 unsigned char data[1] = { 0 }; /* The root domain, no bits. */ 1829 dns_rdata_t rdata = DNS_RDATA_INIT; 1830 1831 r.base = data; 1832 r.length = sizeof(data); 1833 dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nsec, &r); 1834 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0, 1835 &rdata, &tuple)); 1836 CHECK(do_one_tuple(&tuple, db, ver, diff)); 1837 failure: 1838 return (result); 1839} 1840 1841static isc_result_t 1842find_zone_keys(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver, 1843 isc_mem_t *mctx, unsigned int maxkeys, 1844 dst_key_t **keys, unsigned int *nkeys) 1845{ 1846 isc_result_t result; 1847 dns_dbnode_t *node = NULL; 1848 const char *directory = dns_zone_getkeydirectory(zone); 1849 CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); 1850 CHECK(dns_dnssec_findzonekeys2(db, ver, node, dns_db_origin(db), 1851 directory, mctx, maxkeys, keys, nkeys)); 1852 failure: 1853 if (node != NULL) 1854 dns_db_detachnode(db, &node); 1855 return (result); 1856} 1857 1858/*% 1859 * Add RRSIG records for an RRset, recording the change in "diff". 1860 */ 1861static isc_result_t 1862add_sigs(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 1863 dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type, 1864 dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys, 1865 isc_stdtime_t inception, isc_stdtime_t expire, 1866 isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly) 1867{ 1868 isc_result_t result; 1869 dns_dbnode_t *node = NULL; 1870 dns_rdataset_t rdataset; 1871 dns_rdata_t sig_rdata = DNS_RDATA_INIT; 1872 isc_buffer_t buffer; 1873 unsigned char data[1024]; /* XXX */ 1874 unsigned int i, j; 1875 isc_boolean_t added_sig = ISC_FALSE; 1876 isc_mem_t *mctx = client->mctx; 1877 1878 dns_rdataset_init(&rdataset); 1879 isc_buffer_init(&buffer, data, sizeof(data)); 1880 1881 /* Get the rdataset to sign. */ 1882 if (type == dns_rdatatype_nsec3) 1883 CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node)); 1884 else 1885 CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); 1886 CHECK(dns_db_findrdataset(db, node, ver, type, 0, 1887 (isc_stdtime_t) 0, &rdataset, NULL)); 1888 dns_db_detachnode(db, &node); 1889 1890#define REVOKE(x) ((dst_key_flags(x) & DNS_KEYFLAG_REVOKE) != 0) 1891#define KSK(x) ((dst_key_flags(x) & DNS_KEYFLAG_KSK) != 0) 1892#define ALG(x) dst_key_alg(x) 1893 1894 /* 1895 * If we are honoring KSK flags then we need to check that we 1896 * have both KSK and non-KSK keys that are not revoked per 1897 * algorithm. 1898 */ 1899 for (i = 0; i < nkeys; i++) { 1900 isc_boolean_t both = ISC_FALSE; 1901 1902 if (!dst_key_isprivate(keys[i])) 1903 continue; 1904 1905 if (check_ksk && !REVOKE(keys[i])) { 1906 isc_boolean_t have_ksk, have_nonksk; 1907 if (KSK(keys[i])) { 1908 have_ksk = ISC_TRUE; 1909 have_nonksk = ISC_FALSE; 1910 } else { 1911 have_ksk = ISC_FALSE; 1912 have_nonksk = ISC_TRUE; 1913 } 1914 for (j = 0; j < nkeys; j++) { 1915 if (j == i || ALG(keys[i]) != ALG(keys[j])) 1916 continue; 1917 if (REVOKE(keys[j])) 1918 continue; 1919 if (KSK(keys[j])) 1920 have_ksk = ISC_TRUE; 1921 else 1922 have_nonksk = ISC_TRUE; 1923 both = have_ksk && have_nonksk; 1924 if (both) 1925 break; 1926 } 1927 } 1928 1929 if (both) { 1930 if (type == dns_rdatatype_dnskey) { 1931 if (!KSK(keys[i]) && keyset_kskonly) 1932 continue; 1933 } else if (KSK(keys[i])) 1934 continue; 1935 } else if (REVOKE(keys[i]) && type != dns_rdatatype_dnskey) 1936 continue; 1937 1938 /* Calculate the signature, creating a RRSIG RDATA. */ 1939 CHECK(dns_dnssec_sign(name, &rdataset, keys[i], 1940 &inception, &expire, 1941 mctx, &buffer, &sig_rdata)); 1942 1943 /* Update the database and journal with the RRSIG. */ 1944 /* XXX inefficient - will cause dataset merging */ 1945 CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADDRESIGN, name, 1946 rdataset.ttl, &sig_rdata)); 1947 dns_rdata_reset(&sig_rdata); 1948 isc_buffer_init(&buffer, data, sizeof(data)); 1949 added_sig = ISC_TRUE; 1950 } 1951 if (!added_sig) { 1952 update_log(client, zone, ISC_LOG_ERROR, 1953 "found no active private keys, " 1954 "unable to generate any signatures"); 1955 result = ISC_R_NOTFOUND; 1956 } 1957 1958 failure: 1959 if (dns_rdataset_isassociated(&rdataset)) 1960 dns_rdataset_disassociate(&rdataset); 1961 if (node != NULL) 1962 dns_db_detachnode(db, &node); 1963 return (result); 1964} 1965 1966/* 1967 * Delete expired RRsigs and any RRsigs we are about to re-sign. 1968 * See also zone.c:del_sigs(). 1969 */ 1970static isc_result_t 1971del_keysigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 1972 dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys) 1973{ 1974 isc_result_t result; 1975 dns_dbnode_t *node = NULL; 1976 dns_rdataset_t rdataset; 1977 dns_rdata_t rdata = DNS_RDATA_INIT; 1978 unsigned int i; 1979 dns_rdata_rrsig_t rrsig; 1980 isc_boolean_t found; 1981 1982 dns_rdataset_init(&rdataset); 1983 1984 result = dns_db_findnode(db, name, ISC_FALSE, &node); 1985 if (result == ISC_R_NOTFOUND) 1986 return (ISC_R_SUCCESS); 1987 if (result != ISC_R_SUCCESS) 1988 goto failure; 1989 result = dns_db_findrdataset(db, node, ver, dns_rdatatype_rrsig, 1990 dns_rdatatype_dnskey, (isc_stdtime_t) 0, 1991 &rdataset, NULL); 1992 dns_db_detachnode(db, &node); 1993 1994 if (result == ISC_R_NOTFOUND) 1995 return (ISC_R_SUCCESS); 1996 if (result != ISC_R_SUCCESS) 1997 goto failure; 1998 1999 for (result = dns_rdataset_first(&rdataset); 2000 result == ISC_R_SUCCESS; 2001 result = dns_rdataset_next(&rdataset)) { 2002 dns_rdataset_current(&rdataset, &rdata); 2003 result = dns_rdata_tostruct(&rdata, &rrsig, NULL); 2004 RUNTIME_CHECK(result == ISC_R_SUCCESS); 2005 found = ISC_FALSE; 2006 for (i = 0; i < nkeys; i++) { 2007 if (rrsig.keyid == dst_key_id(keys[i])) { 2008 found = ISC_TRUE; 2009 if (!dst_key_isprivate(keys[i])) { 2010 /* 2011 * The re-signing code in zone.c 2012 * will mark this as offline. 2013 * Just skip the record for now. 2014 */ 2015 break; 2016 } 2017 result = update_one_rr(db, ver, diff, 2018 DNS_DIFFOP_DEL, name, 2019 rdataset.ttl, &rdata); 2020 break; 2021 } 2022 } 2023 /* 2024 * If there is not a matching DNSKEY then delete the RRSIG. 2025 */ 2026 if (!found) 2027 result = update_one_rr(db, ver, diff, DNS_DIFFOP_DEL, 2028 name, rdataset.ttl, &rdata); 2029 dns_rdata_reset(&rdata); 2030 if (result != ISC_R_SUCCESS) 2031 break; 2032 } 2033 dns_rdataset_disassociate(&rdataset); 2034 if (result == ISC_R_NOMORE) 2035 result = ISC_R_SUCCESS; 2036failure: 2037 if (node != NULL) 2038 dns_db_detachnode(db, &node); 2039 return (result); 2040} 2041 2042static isc_result_t 2043add_exposed_sigs(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 2044 dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t cut, 2045 dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys, 2046 isc_stdtime_t inception, isc_stdtime_t expire, 2047 isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly) 2048{ 2049 isc_result_t result; 2050 dns_dbnode_t *node; 2051 dns_rdatasetiter_t *iter; 2052 2053 node = NULL; 2054 result = dns_db_findnode(db, name, ISC_FALSE, &node); 2055 if (result == ISC_R_NOTFOUND) 2056 return (ISC_R_SUCCESS); 2057 if (result != ISC_R_SUCCESS) 2058 return (result); 2059 2060 iter = NULL; 2061 result = dns_db_allrdatasets(db, node, ver, 2062 (isc_stdtime_t) 0, &iter); 2063 if (result != ISC_R_SUCCESS) 2064 goto cleanup_node; 2065 2066 for (result = dns_rdatasetiter_first(iter); 2067 result == ISC_R_SUCCESS; 2068 result = dns_rdatasetiter_next(iter)) 2069 { 2070 dns_rdataset_t rdataset; 2071 dns_rdatatype_t type; 2072 isc_boolean_t flag; 2073 2074 dns_rdataset_init(&rdataset); 2075 dns_rdatasetiter_current(iter, &rdataset); 2076 type = rdataset.type; 2077 dns_rdataset_disassociate(&rdataset); 2078 2079 /* 2080 * We don't need to sign unsigned NSEC records at the cut 2081 * as they are handled elsewhere. 2082 */ 2083 if ((type == dns_rdatatype_rrsig) || 2084 (cut && type != dns_rdatatype_ds)) 2085 continue; 2086 result = rrset_exists(db, ver, name, dns_rdatatype_rrsig, 2087 type, &flag); 2088 if (result != ISC_R_SUCCESS) 2089 goto cleanup_iterator; 2090 if (flag) 2091 continue;; 2092 result = add_sigs(client, zone, db, ver, name, type, diff, 2093 keys, nkeys, inception, expire, 2094 check_ksk, keyset_kskonly); 2095 if (result != ISC_R_SUCCESS) 2096 goto cleanup_iterator; 2097 } 2098 if (result == ISC_R_NOMORE) 2099 result = ISC_R_SUCCESS; 2100 2101 cleanup_iterator: 2102 dns_rdatasetiter_destroy(&iter); 2103 2104 cleanup_node: 2105 dns_db_detachnode(db, &node); 2106 2107 return (result); 2108} 2109 2110/*% 2111 * Update RRSIG, NSEC and NSEC3 records affected by an update. The original 2112 * update, including the SOA serial update but excluding the RRSIG & NSEC 2113 * changes, is in "diff" and has already been applied to "newver" of "db". 2114 * The database version prior to the update is "oldver". 2115 * 2116 * The necessary RRSIG, NSEC and NSEC3 changes will be applied to "newver" 2117 * and added (as a minimal diff) to "diff". 2118 * 2119 * The RRSIGs generated will be valid for 'sigvalidityinterval' seconds. 2120 */ 2121static isc_result_t 2122update_signatures(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 2123 dns_dbversion_t *oldver, dns_dbversion_t *newver, 2124 dns_diff_t *diff, isc_uint32_t sigvalidityinterval) 2125{ 2126 isc_result_t result; 2127 dns_difftuple_t *t; 2128 dns_diff_t diffnames; 2129 dns_diff_t affected; 2130 dns_diff_t sig_diff; 2131 dns_diff_t nsec_diff; 2132 dns_diff_t nsec_mindiff; 2133 isc_boolean_t flag, build_nsec, build_nsec3; 2134 dst_key_t *zone_keys[MAXZONEKEYS]; 2135 unsigned int nkeys = 0; 2136 unsigned int i; 2137 isc_stdtime_t now, inception, expire; 2138 dns_ttl_t nsecttl; 2139 dns_rdata_soa_t soa; 2140 dns_rdata_t rdata = DNS_RDATA_INIT; 2141 dns_rdataset_t rdataset; 2142 dns_dbnode_t *node = NULL; 2143 isc_boolean_t check_ksk, keyset_kskonly; 2144 isc_boolean_t unsecure; 2145 isc_boolean_t cut; 2146 dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); 2147 2148 dns_diff_init(client->mctx, &diffnames); 2149 dns_diff_init(client->mctx, &affected); 2150 2151 dns_diff_init(client->mctx, &sig_diff); 2152 sig_diff.resign = dns_zone_getsigresigninginterval(zone); 2153 dns_diff_init(client->mctx, &nsec_diff); 2154 dns_diff_init(client->mctx, &nsec_mindiff); 2155 2156 result = find_zone_keys(zone, db, newver, client->mctx, 2157 MAXZONEKEYS, zone_keys, &nkeys); 2158 if (result != ISC_R_SUCCESS) { 2159 update_log(client, zone, ISC_LOG_ERROR, 2160 "could not get zone keys for secure dynamic update"); 2161 goto failure; 2162 } 2163 2164 isc_stdtime_get(&now); 2165 inception = now - 3600; /* Allow for some clock skew. */ 2166 expire = now + sigvalidityinterval; 2167 2168 /* 2169 * Do we look at the KSK flag on the DNSKEY to determining which 2170 * keys sign which RRsets? First check the zone option then 2171 * check the keys flags to make sure at least one has a ksk set 2172 * and one doesn't. 2173 */ 2174 check_ksk = ISC_TF((dns_zone_getoptions(zone) & 2175 DNS_ZONEOPT_UPDATECHECKKSK) != 0); 2176 keyset_kskonly = ISC_TF((dns_zone_getoptions(zone) & 2177 DNS_ZONEOPT_DNSKEYKSKONLY) != 0); 2178 2179 /* 2180 * Get the NSEC/NSEC3 TTL from the SOA MINIMUM field. 2181 */ 2182 CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node)); 2183 dns_rdataset_init(&rdataset); 2184 CHECK(dns_db_findrdataset(db, node, newver, dns_rdatatype_soa, 0, 2185 (isc_stdtime_t) 0, &rdataset, NULL)); 2186 CHECK(dns_rdataset_first(&rdataset)); 2187 dns_rdataset_current(&rdataset, &rdata); 2188 CHECK(dns_rdata_tostruct(&rdata, &soa, NULL)); 2189 nsecttl = soa.minimum; 2190 dns_rdataset_disassociate(&rdataset); 2191 dns_db_detachnode(db, &node); 2192 2193 /* 2194 * Find all RRsets directly affected by the update, and 2195 * update their RRSIGs. Also build a list of names affected 2196 * by the update in "diffnames". 2197 */ 2198 CHECK(dns_diff_sort(diff, temp_order)); 2199 2200 t = ISC_LIST_HEAD(diff->tuples); 2201 while (t != NULL) { 2202 dns_name_t *name = &t->name; 2203 /* Now "name" is a new, unique name affected by the update. */ 2204 2205 CHECK(namelist_append_name(&diffnames, name)); 2206 2207 while (t != NULL && dns_name_equal(&t->name, name)) { 2208 dns_rdatatype_t type; 2209 type = t->rdata.type; 2210 2211 /* 2212 * Now "name" and "type" denote a new unique RRset 2213 * affected by the update. 2214 */ 2215 2216 /* Don't sign RRSIGs. */ 2217 if (type == dns_rdatatype_rrsig) 2218 goto skip; 2219 2220 /* 2221 * Delete all old RRSIGs covering this type, since they 2222 * are all invalid when the signed RRset has changed. 2223 * We may not be able to recreate all of them - tough. 2224 * Special case changes to the zone's DNSKEY records 2225 * to support offline KSKs. 2226 */ 2227 if (type == dns_rdatatype_dnskey) 2228 del_keysigs(db, newver, name, &sig_diff, 2229 zone_keys, nkeys); 2230 else 2231 CHECK(delete_if(true_p, db, newver, name, 2232 dns_rdatatype_rrsig, type, 2233 NULL, &sig_diff)); 2234 2235 /* 2236 * If this RRset is still visible after the update, 2237 * add a new signature for it. 2238 */ 2239 CHECK(rrset_visible(db, newver, name, type, &flag)); 2240 if (flag) { 2241 CHECK(add_sigs(client, zone, db, newver, name, 2242 type, &sig_diff, zone_keys, 2243 nkeys, inception, expire, 2244 check_ksk, keyset_kskonly)); 2245 } 2246 skip: 2247 /* Skip any other updates to the same RRset. */ 2248 while (t != NULL && 2249 dns_name_equal(&t->name, name) && 2250 t->rdata.type == type) 2251 { 2252 t = ISC_LIST_NEXT(t, link); 2253 } 2254 } 2255 } 2256 update_log(client, zone, ISC_LOG_DEBUG(3), "updated data signatures"); 2257 2258 /* Remove orphaned NSECs and RRSIG NSECs. */ 2259 for (t = ISC_LIST_HEAD(diffnames.tuples); 2260 t != NULL; 2261 t = ISC_LIST_NEXT(t, link)) 2262 { 2263 CHECK(non_nsec_rrset_exists(db, newver, &t->name, &flag)); 2264 if (! flag) { 2265 CHECK(delete_if(true_p, db, newver, &t->name, 2266 dns_rdatatype_any, 0, 2267 NULL, &sig_diff)); 2268 } 2269 } 2270 update_log(client, zone, ISC_LOG_DEBUG(3), 2271 "removed any orphaned NSEC records"); 2272 2273 /* 2274 * See if we need to build NSEC or NSEC3 chains. 2275 */ 2276 CHECK(dns_private_chains(db, newver, privatetype, &build_nsec, 2277 &build_nsec3)); 2278 if (!build_nsec) 2279 goto update_nsec3; 2280 2281 update_log(client, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC chain"); 2282 2283 /* 2284 * When a name is created or deleted, its predecessor needs to 2285 * have its NSEC updated. 2286 */ 2287 for (t = ISC_LIST_HEAD(diffnames.tuples); 2288 t != NULL; 2289 t = ISC_LIST_NEXT(t, link)) 2290 { 2291 isc_boolean_t existed, exists; 2292 dns_fixedname_t fixedname; 2293 dns_name_t *prevname; 2294 2295 dns_fixedname_init(&fixedname); 2296 prevname = dns_fixedname_name(&fixedname); 2297 2298 CHECK(name_exists(db, oldver, &t->name, &existed)); 2299 CHECK(name_exists(db, newver, &t->name, &exists)); 2300 if (exists == existed) 2301 continue; 2302 2303 /* 2304 * Find the predecessor. 2305 * When names become obscured or unobscured in this update 2306 * transaction, we may find the wrong predecessor because 2307 * the NSECs have not yet been updated to reflect the delegation 2308 * change. This should not matter because in this case, 2309 * the correct predecessor is either the delegation node or 2310 * a newly unobscured node, and those nodes are on the 2311 * "affected" list in any case. 2312 */ 2313 CHECK(next_active(client, zone, db, newver, 2314 &t->name, prevname, ISC_FALSE)); 2315 CHECK(namelist_append_name(&affected, prevname)); 2316 } 2317 2318 /* 2319 * Find names potentially affected by delegation changes 2320 * (obscured by adding an NS or DNAME, or unobscured by 2321 * removing one). 2322 */ 2323 for (t = ISC_LIST_HEAD(diffnames.tuples); 2324 t != NULL; 2325 t = ISC_LIST_NEXT(t, link)) 2326 { 2327 isc_boolean_t ns_existed, dname_existed; 2328 isc_boolean_t ns_exists, dname_exists; 2329 2330 CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0, 2331 &ns_existed)); 2332 CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_dname, 0, 2333 &dname_existed)); 2334 CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0, 2335 &ns_exists)); 2336 CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0, 2337 &dname_exists)); 2338 if ((ns_exists || dname_exists) == (ns_existed || dname_existed)) 2339 continue; 2340 /* 2341 * There was a delegation change. Mark all subdomains 2342 * of t->name as potentially needing a NSEC update. 2343 */ 2344 CHECK(namelist_append_subdomain(db, &t->name, &affected)); 2345 } 2346 2347 ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link); 2348 INSIST(ISC_LIST_EMPTY(diffnames.tuples)); 2349 2350 CHECK(uniqify_name_list(&affected)); 2351 2352 /* 2353 * Determine which names should have NSECs, and delete/create 2354 * NSECs to make it so. We don't know the final NSEC targets yet, 2355 * so we just create placeholder NSECs with arbitrary contents 2356 * to indicate that their respective owner names should be part of 2357 * the NSEC chain. 2358 */ 2359 for (t = ISC_LIST_HEAD(affected.tuples); 2360 t != NULL; 2361 t = ISC_LIST_NEXT(t, link)) 2362 { 2363 isc_boolean_t exists; 2364 dns_name_t *name = &t->name; 2365 2366 CHECK(name_exists(db, newver, name, &exists)); 2367 if (! exists) 2368 continue; 2369 CHECK(is_active(db, newver, name, &flag, &cut, NULL)); 2370 if (!flag) { 2371 /* 2372 * This name is obscured. Delete any 2373 * existing NSEC record. 2374 */ 2375 CHECK(delete_if(true_p, db, newver, name, 2376 dns_rdatatype_nsec, 0, 2377 NULL, &nsec_diff)); 2378 CHECK(delete_if(rrsig_p, db, newver, name, 2379 dns_rdatatype_any, 0, NULL, diff)); 2380 } else { 2381 /* 2382 * This name is not obscured. It needs to have a 2383 * NSEC unless it is the at the origin, in which 2384 * case it should already exist if there is a complete 2385 * NSEC chain and if there isn't a complete NSEC chain 2386 * we don't want to add one as that would signal that 2387 * there is a complete NSEC chain. 2388 */ 2389 if (!dns_name_equal(name, dns_db_origin(db))) { 2390 CHECK(rrset_exists(db, newver, name, 2391 dns_rdatatype_nsec, 0, 2392 &flag)); 2393 if (!flag) 2394 CHECK(add_placeholder_nsec(db, newver, 2395 name, diff)); 2396 } 2397 CHECK(add_exposed_sigs(client, zone, db, newver, name, 2398 cut, &sig_diff, zone_keys, nkeys, 2399 inception, expire, check_ksk, 2400 keyset_kskonly)); 2401 } 2402 } 2403 2404 /* 2405 * Now we know which names are part of the NSEC chain. 2406 * Make them all point at their correct targets. 2407 */ 2408 for (t = ISC_LIST_HEAD(affected.tuples); 2409 t != NULL; 2410 t = ISC_LIST_NEXT(t, link)) 2411 { 2412 CHECK(rrset_exists(db, newver, &t->name, 2413 dns_rdatatype_nsec, 0, &flag)); 2414 if (flag) { 2415 /* 2416 * There is a NSEC, but we don't know if it is correct. 2417 * Delete it and create a correct one to be sure. 2418 * If the update was unnecessary, the diff minimization 2419 * will take care of eliminating it from the journal, 2420 * IXFRs, etc. 2421 * 2422 * The RRSIG bit should always be set in the NSECs 2423 * we generate, because they will all get RRSIG NSECs. 2424 * (XXX what if the zone keys are missing?). 2425 * Because the RRSIG NSECs have not necessarily been 2426 * created yet, the correctness of the bit mask relies 2427 * on the assumption that NSECs are only created if 2428 * there is other data, and if there is other data, 2429 * there are other RRSIGs. 2430 */ 2431 CHECK(add_nsec(client, zone, db, newver, &t->name, 2432 nsecttl, &nsec_diff)); 2433 } 2434 } 2435 2436 /* 2437 * Minimize the set of NSEC updates so that we don't 2438 * have to regenerate the RRSIG NSECs for NSECs that were 2439 * replaced with identical ones. 2440 */ 2441 while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) { 2442 ISC_LIST_UNLINK(nsec_diff.tuples, t, link); 2443 dns_diff_appendminimal(&nsec_mindiff, &t); 2444 } 2445 2446 update_log(client, zone, ISC_LOG_DEBUG(3), 2447 "signing rebuilt NSEC chain"); 2448 2449 /* Update RRSIG NSECs. */ 2450 for (t = ISC_LIST_HEAD(nsec_mindiff.tuples); 2451 t != NULL; 2452 t = ISC_LIST_NEXT(t, link)) 2453 { 2454 if (t->op == DNS_DIFFOP_DEL) { 2455 CHECK(delete_if(true_p, db, newver, &t->name, 2456 dns_rdatatype_rrsig, dns_rdatatype_nsec, 2457 NULL, &sig_diff)); 2458 } else if (t->op == DNS_DIFFOP_ADD) { 2459 CHECK(add_sigs(client, zone, db, newver, &t->name, 2460 dns_rdatatype_nsec, &sig_diff, 2461 zone_keys, nkeys, inception, expire, 2462 check_ksk, keyset_kskonly)); 2463 } else { 2464 INSIST(0); 2465 } 2466 } 2467 2468 update_nsec3: 2469 2470 /* Record our changes for the journal. */ 2471 while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) { 2472 ISC_LIST_UNLINK(sig_diff.tuples, t, link); 2473 dns_diff_appendminimal(diff, &t); 2474 } 2475 while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) { 2476 ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link); 2477 dns_diff_appendminimal(diff, &t); 2478 } 2479 2480 INSIST(ISC_LIST_EMPTY(sig_diff.tuples)); 2481 INSIST(ISC_LIST_EMPTY(nsec_diff.tuples)); 2482 INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples)); 2483 2484 if (!build_nsec3) { 2485 update_log(client, zone, ISC_LOG_DEBUG(3), 2486 "no NSEC3 chains to rebuild"); 2487 goto failure; 2488 } 2489 2490 update_log(client, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC3 chains"); 2491 2492 dns_diff_clear(&diffnames); 2493 dns_diff_clear(&affected); 2494 2495 CHECK(dns_diff_sort(diff, temp_order)); 2496 2497 /* 2498 * Find names potentially affected by delegation changes 2499 * (obscured by adding an NS or DNAME, or unobscured by 2500 * removing one). 2501 */ 2502 t = ISC_LIST_HEAD(diff->tuples); 2503 while (t != NULL) { 2504 dns_name_t *name = &t->name; 2505 2506 isc_boolean_t ns_existed, dname_existed; 2507 isc_boolean_t ns_exists, dname_exists; 2508 isc_boolean_t exists, existed; 2509 2510 if (t->rdata.type == dns_rdatatype_nsec || 2511 t->rdata.type == dns_rdatatype_rrsig) { 2512 t = ISC_LIST_NEXT(t, link); 2513 continue; 2514 } 2515 2516 CHECK(namelist_append_name(&affected, name)); 2517 2518 CHECK(rrset_exists(db, oldver, name, dns_rdatatype_ns, 0, 2519 &ns_existed)); 2520 CHECK(rrset_exists(db, oldver, name, dns_rdatatype_dname, 0, 2521 &dname_existed)); 2522 CHECK(rrset_exists(db, newver, name, dns_rdatatype_ns, 0, 2523 &ns_exists)); 2524 CHECK(rrset_exists(db, newver, name, dns_rdatatype_dname, 0, 2525 &dname_exists)); 2526 2527 exists = ns_exists || dname_exists; 2528 existed = ns_existed || dname_existed; 2529 if (exists == existed) 2530 goto nextname; 2531 /* 2532 * There was a delegation change. Mark all subdomains 2533 * of t->name as potentially needing a NSEC3 update. 2534 */ 2535 CHECK(namelist_append_subdomain(db, name, &affected)); 2536 2537 nextname: 2538 while (t != NULL && dns_name_equal(&t->name, name)) 2539 t = ISC_LIST_NEXT(t, link); 2540 } 2541 2542 for (t = ISC_LIST_HEAD(affected.tuples); 2543 t != NULL; 2544 t = ISC_LIST_NEXT(t, link)) { 2545 dns_name_t *name = &t->name; 2546 2547 unsecure = ISC_FALSE; /* Silence compiler warning. */ 2548 CHECK(is_active(db, newver, name, &flag, &cut, &unsecure)); 2549 2550 if (!flag) { 2551 CHECK(delete_if(rrsig_p, db, newver, name, 2552 dns_rdatatype_any, 0, NULL, diff)); 2553 CHECK(dns_nsec3_delnsec3sx(db, newver, name, 2554 privatetype, &nsec_diff)); 2555 } else { 2556 CHECK(add_exposed_sigs(client, zone, db, newver, name, 2557 cut, &sig_diff, zone_keys, nkeys, 2558 inception, expire, check_ksk, 2559 keyset_kskonly)); 2560 CHECK(dns_nsec3_addnsec3sx(db, newver, name, nsecttl, 2561 unsecure, privatetype, 2562 &nsec_diff)); 2563 } 2564 } 2565 2566 /* 2567 * Minimize the set of NSEC3 updates so that we don't 2568 * have to regenerate the RRSIG NSEC3s for NSEC3s that were 2569 * replaced with identical ones. 2570 */ 2571 while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) { 2572 ISC_LIST_UNLINK(nsec_diff.tuples, t, link); 2573 dns_diff_appendminimal(&nsec_mindiff, &t); 2574 } 2575 2576 update_log(client, zone, ISC_LOG_DEBUG(3), 2577 "signing rebuilt NSEC3 chain"); 2578 2579 /* Update RRSIG NSEC3s. */ 2580 for (t = ISC_LIST_HEAD(nsec_mindiff.tuples); 2581 t != NULL; 2582 t = ISC_LIST_NEXT(t, link)) 2583 { 2584 if (t->op == DNS_DIFFOP_DEL) { 2585 CHECK(delete_if(true_p, db, newver, &t->name, 2586 dns_rdatatype_rrsig, 2587 dns_rdatatype_nsec3, 2588 NULL, &sig_diff)); 2589 } else if (t->op == DNS_DIFFOP_ADD) { 2590 CHECK(add_sigs(client, zone, db, newver, &t->name, 2591 dns_rdatatype_nsec3, 2592 &sig_diff, zone_keys, nkeys, 2593 inception, expire, check_ksk, 2594 keyset_kskonly)); 2595 } else { 2596 INSIST(0); 2597 } 2598 } 2599 2600 /* Record our changes for the journal. */ 2601 while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) { 2602 ISC_LIST_UNLINK(sig_diff.tuples, t, link); 2603 dns_diff_appendminimal(diff, &t); 2604 } 2605 while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) { 2606 ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link); 2607 dns_diff_appendminimal(diff, &t); 2608 } 2609 2610 INSIST(ISC_LIST_EMPTY(sig_diff.tuples)); 2611 INSIST(ISC_LIST_EMPTY(nsec_diff.tuples)); 2612 INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples)); 2613 2614 failure: 2615 dns_diff_clear(&sig_diff); 2616 dns_diff_clear(&nsec_diff); 2617 dns_diff_clear(&nsec_mindiff); 2618 2619 dns_diff_clear(&affected); 2620 dns_diff_clear(&diffnames); 2621 2622 for (i = 0; i < nkeys; i++) 2623 dst_key_free(&zone_keys[i]); 2624 2625 return (result); 2626} 2627 2628 2629/**************************************************************************/ 2630/*% 2631 * The actual update code in all its glory. We try to follow 2632 * the RFC2136 pseudocode as closely as possible. 2633 */ 2634 2635static isc_result_t 2636send_update_event(ns_client_t *client, dns_zone_t *zone) { 2637 isc_result_t result = ISC_R_SUCCESS; 2638 update_event_t *event = NULL; 2639 isc_task_t *zonetask = NULL; 2640 ns_client_t *evclient; 2641 2642 event = (update_event_t *) 2643 isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE, 2644 update_action, NULL, sizeof(*event)); 2645 if (event == NULL) 2646 FAIL(ISC_R_NOMEMORY); 2647 event->zone = zone; 2648 event->result = ISC_R_SUCCESS; 2649 2650 evclient = NULL; 2651 ns_client_attach(client, &evclient); 2652 INSIST(client->nupdates == 0); 2653 client->nupdates++; 2654 event->ev_arg = evclient; 2655 2656 dns_zone_gettask(zone, &zonetask); 2657 isc_task_send(zonetask, ISC_EVENT_PTR(&event)); 2658 2659 failure: 2660 if (event != NULL) 2661 isc_event_free(ISC_EVENT_PTR(&event)); 2662 return (result); 2663} 2664 2665static void 2666respond(ns_client_t *client, isc_result_t result) { 2667 isc_result_t msg_result; 2668 2669 msg_result = dns_message_reply(client->message, ISC_TRUE); 2670 if (msg_result != ISC_R_SUCCESS) 2671 goto msg_failure; 2672 client->message->rcode = dns_result_torcode(result); 2673 2674 ns_client_send(client); 2675 return; 2676 2677 msg_failure: 2678 isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, 2679 ISC_LOG_ERROR, 2680 "could not create update response message: %s", 2681 isc_result_totext(msg_result)); 2682 ns_client_next(client, msg_result); 2683} 2684 2685void 2686ns_update_start(ns_client_t *client, isc_result_t sigresult) { 2687 dns_message_t *request = client->message; 2688 isc_result_t result; 2689 dns_name_t *zonename; 2690 dns_rdataset_t *zone_rdataset; 2691 dns_zone_t *zone = NULL; 2692 2693 /* 2694 * Interpret the zone section. 2695 */ 2696 result = dns_message_firstname(request, DNS_SECTION_ZONE); 2697 if (result != ISC_R_SUCCESS) 2698 FAILC(DNS_R_FORMERR, "update zone section empty"); 2699 2700 /* 2701 * The zone section must contain exactly one "question", and 2702 * it must be of type SOA. 2703 */ 2704 zonename = NULL; 2705 dns_message_currentname(request, DNS_SECTION_ZONE, &zonename); 2706 zone_rdataset = ISC_LIST_HEAD(zonename->list); 2707 if (zone_rdataset->type != dns_rdatatype_soa) 2708 FAILC(DNS_R_FORMERR, 2709 "update zone section contains non-SOA"); 2710 if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) 2711 FAILC(DNS_R_FORMERR, 2712 "update zone section contains multiple RRs"); 2713 2714 /* The zone section must have exactly one name. */ 2715 result = dns_message_nextname(request, DNS_SECTION_ZONE); 2716 if (result != ISC_R_NOMORE) 2717 FAILC(DNS_R_FORMERR, 2718 "update zone section contains multiple RRs"); 2719 2720 result = dns_zt_find(client->view->zonetable, zonename, 0, NULL, 2721 &zone); 2722 if (result != ISC_R_SUCCESS) 2723 FAILC(DNS_R_NOTAUTH, "not authoritative for update zone"); 2724 2725 switch(dns_zone_gettype(zone)) { 2726 case dns_zone_master: 2727 case dns_zone_dlz: 2728 /* 2729 * We can now fail due to a bad signature as we now know 2730 * that we are the master. 2731 */ 2732 if (sigresult != ISC_R_SUCCESS) 2733 FAIL(sigresult); 2734 CHECK(send_update_event(client, zone)); 2735 break; 2736 case dns_zone_slave: 2737 CHECK(checkupdateacl(client, dns_zone_getforwardacl(zone), 2738 "update forwarding", zonename, ISC_TRUE, 2739 ISC_FALSE)); 2740 CHECK(send_forward_event(client, zone)); 2741 break; 2742 default: 2743 FAILC(DNS_R_NOTAUTH, "not authoritative for update zone"); 2744 } 2745 return; 2746 2747 failure: 2748 if (result == DNS_R_REFUSED) { 2749 INSIST(dns_zone_gettype(zone) == dns_zone_slave); 2750 inc_stats(zone, dns_nsstatscounter_updaterej); 2751 } 2752 /* 2753 * We failed without having sent an update event to the zone. 2754 * We are still in the client task context, so we can 2755 * simply give an error response without switching tasks. 2756 */ 2757 respond(client, result); 2758 if (zone != NULL) 2759 dns_zone_detach(&zone); 2760} 2761 2762/*% 2763 * DS records are not allowed to exist without corresponding NS records, 2764 * RFC 3658, 2.2 Protocol Change, 2765 * "DS RRsets MUST NOT appear at non-delegation points or at a zone's apex". 2766 */ 2767 2768static isc_result_t 2769remove_orphaned_ds(dns_db_t *db, dns_dbversion_t *newver, dns_diff_t *diff) { 2770 isc_result_t result; 2771 isc_boolean_t ns_exists; 2772 dns_difftuple_t *tupple; 2773 dns_diff_t temp_diff; 2774 2775 dns_diff_init(diff->mctx, &temp_diff); 2776 2777 for (tupple = ISC_LIST_HEAD(diff->tuples); 2778 tupple != NULL; 2779 tupple = ISC_LIST_NEXT(tupple, link)) { 2780 if (!((tupple->op == DNS_DIFFOP_DEL && 2781 tupple->rdata.type == dns_rdatatype_ns) || 2782 (tupple->op == DNS_DIFFOP_ADD && 2783 tupple->rdata.type == dns_rdatatype_ds))) 2784 continue; 2785 CHECK(rrset_exists(db, newver, &tupple->name, 2786 dns_rdatatype_ns, 0, &ns_exists)); 2787 if (ns_exists && 2788 !dns_name_equal(&tupple->name, dns_db_origin(db))) 2789 continue; 2790 CHECK(delete_if(true_p, db, newver, &tupple->name, 2791 dns_rdatatype_ds, 0, NULL, &temp_diff)); 2792 } 2793 result = ISC_R_SUCCESS; 2794 2795 failure: 2796 for (tupple = ISC_LIST_HEAD(temp_diff.tuples); 2797 tupple != NULL; 2798 tupple = ISC_LIST_HEAD(temp_diff.tuples)) { 2799 ISC_LIST_UNLINK(temp_diff.tuples, tupple, link); 2800 dns_diff_appendminimal(diff, &tupple); 2801 } 2802 return (result); 2803} 2804 2805/* 2806 * This implements the post load integrity checks for mx records. 2807 */ 2808static isc_result_t 2809check_mx(ns_client_t *client, dns_zone_t *zone, 2810 dns_db_t *db, dns_dbversion_t *newver, dns_diff_t *diff) 2811{ 2812 char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")]; 2813 char ownerbuf[DNS_NAME_FORMATSIZE]; 2814 char namebuf[DNS_NAME_FORMATSIZE]; 2815 char altbuf[DNS_NAME_FORMATSIZE]; 2816 dns_difftuple_t *t; 2817 dns_fixedname_t fixed; 2818 dns_name_t *foundname; 2819 dns_rdata_mx_t mx; 2820 dns_rdata_t rdata; 2821 isc_boolean_t ok = ISC_TRUE; 2822 isc_boolean_t isaddress; 2823 isc_result_t result; 2824 struct in6_addr addr6; 2825 struct in_addr addr; 2826 unsigned int options; 2827 2828 dns_fixedname_init(&fixed); 2829 foundname = dns_fixedname_name(&fixed); 2830 dns_rdata_init(&rdata); 2831 options = dns_zone_getoptions(zone); 2832 2833 for (t = ISC_LIST_HEAD(diff->tuples); 2834 t != NULL; 2835 t = ISC_LIST_NEXT(t, link)) { 2836 if (t->op != DNS_DIFFOP_ADD || 2837 t->rdata.type != dns_rdatatype_mx) 2838 continue; 2839 2840 result = dns_rdata_tostruct(&t->rdata, &mx, NULL); 2841 RUNTIME_CHECK(result == ISC_R_SUCCESS); 2842 /* 2843 * Check if we will error out if we attempt to reload the 2844 * zone. 2845 */ 2846 dns_name_format(&mx.mx, namebuf, sizeof(namebuf)); 2847 dns_name_format(&t->name, ownerbuf, sizeof(ownerbuf)); 2848 isaddress = ISC_FALSE; 2849 if ((options & DNS_RDATA_CHECKMX) != 0 && 2850 strlcpy(tmp, namebuf, sizeof(tmp)) < sizeof(tmp)) { 2851 if (tmp[strlen(tmp) - 1] == '.') 2852 tmp[strlen(tmp) - 1] = '\0'; 2853 if (inet_aton(tmp, &addr) == 1 || 2854 inet_pton(AF_INET6, tmp, &addr6) == 1) 2855 isaddress = ISC_TRUE; 2856 } 2857 2858 if (isaddress && (options & DNS_RDATA_CHECKMXFAIL) != 0) { 2859 update_log(client, zone, ISC_LOG_ERROR, 2860 "%s/MX: '%s': %s", 2861 ownerbuf, namebuf, 2862 dns_result_totext(DNS_R_MXISADDRESS)); 2863 ok = ISC_FALSE; 2864 } else if (isaddress) { 2865 update_log(client, zone, ISC_LOG_WARNING, 2866 "%s/MX: warning: '%s': %s", 2867 ownerbuf, namebuf, 2868 dns_result_totext(DNS_R_MXISADDRESS)); 2869 } 2870 2871 /* 2872 * Check zone integrity checks. 2873 */ 2874 if ((options & DNS_ZONEOPT_CHECKINTEGRITY) == 0) 2875 continue; 2876 result = dns_db_find(db, &mx.mx, newver, dns_rdatatype_a, 2877 0, 0, NULL, foundname, NULL, NULL); 2878 if (result == ISC_R_SUCCESS) 2879 continue; 2880 2881 if (result == DNS_R_NXRRSET) { 2882 result = dns_db_find(db, &mx.mx, newver, 2883 dns_rdatatype_aaaa, 2884 0, 0, NULL, foundname, 2885 NULL, NULL); 2886 if (result == ISC_R_SUCCESS) 2887 continue; 2888 } 2889 2890 if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN) { 2891 update_log(client, zone, ISC_LOG_ERROR, 2892 "%s/MX '%s' has no address records " 2893 "(A or AAAA)", ownerbuf, namebuf); 2894 ok = ISC_FALSE; 2895 } else if (result == DNS_R_CNAME) { 2896 update_log(client, zone, ISC_LOG_ERROR, 2897 "%s/MX '%s' is a CNAME (illegal)", 2898 ownerbuf, namebuf); 2899 ok = ISC_FALSE; 2900 } else if (result == DNS_R_DNAME) { 2901 dns_name_format(foundname, altbuf, sizeof altbuf); 2902 update_log(client, zone, ISC_LOG_ERROR, 2903 "%s/MX '%s' is below a DNAME '%s' (illegal)", 2904 ownerbuf, namebuf, altbuf); 2905 ok = ISC_FALSE; 2906 } 2907 } 2908 return (ok ? ISC_R_SUCCESS : DNS_R_REFUSED); 2909} 2910 2911static isc_result_t 2912rr_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, 2913 const dns_rdata_t *rdata, isc_boolean_t *flag) 2914{ 2915 dns_rdataset_t rdataset; 2916 dns_dbnode_t *node = NULL; 2917 isc_result_t result; 2918 2919 dns_rdataset_init(&rdataset); 2920 if (rdata->type == dns_rdatatype_nsec3) 2921 CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node)); 2922 else 2923 CHECK(dns_db_findnode(db, name, ISC_FALSE, &node)); 2924 result = dns_db_findrdataset(db, node, ver, rdata->type, 0, 2925 (isc_stdtime_t) 0, &rdataset, NULL); 2926 if (result == ISC_R_NOTFOUND) { 2927 *flag = ISC_FALSE; 2928 result = ISC_R_SUCCESS; 2929 goto failure; 2930 } 2931 2932 for (result = dns_rdataset_first(&rdataset); 2933 result == ISC_R_SUCCESS; 2934 result = dns_rdataset_next(&rdataset)) { 2935 dns_rdata_t myrdata = DNS_RDATA_INIT; 2936 dns_rdataset_current(&rdataset, &myrdata); 2937 if (!dns_rdata_casecompare(&myrdata, rdata)) 2938 break; 2939 } 2940 dns_rdataset_disassociate(&rdataset); 2941 if (result == ISC_R_SUCCESS) { 2942 *flag = ISC_TRUE; 2943 } else if (result == ISC_R_NOMORE) { 2944 *flag = ISC_FALSE; 2945 result = ISC_R_SUCCESS; 2946 } 2947 2948 failure: 2949 if (node != NULL) 2950 dns_db_detachnode(db, &node); 2951 return (result); 2952} 2953 2954static isc_result_t 2955get_iterations(dns_db_t *db, dns_dbversion_t *ver, dns_rdatatype_t privatetype, 2956 unsigned int *iterationsp) 2957{ 2958 dns_dbnode_t *node = NULL; 2959 dns_rdata_nsec3param_t nsec3param; 2960 dns_rdataset_t rdataset; 2961 isc_result_t result; 2962 unsigned int iterations = 0; 2963 2964 dns_rdataset_init(&rdataset); 2965 2966 result = dns_db_getoriginnode(db, &node); 2967 if (result != ISC_R_SUCCESS) 2968 return (result); 2969 result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param, 2970 0, (isc_stdtime_t) 0, &rdataset, NULL); 2971 if (result == ISC_R_NOTFOUND) 2972 goto try_private; 2973 if (result != ISC_R_SUCCESS) 2974 goto failure; 2975 2976 for (result = dns_rdataset_first(&rdataset); 2977 result == ISC_R_SUCCESS; 2978 result = dns_rdataset_next(&rdataset)) { 2979 dns_rdata_t rdata = DNS_RDATA_INIT; 2980 dns_rdataset_current(&rdataset, &rdata); 2981 CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); 2982 if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) 2983 continue; 2984 if (nsec3param.iterations > iterations) 2985 iterations = nsec3param.iterations; 2986 } 2987 if (result != ISC_R_NOMORE) 2988 goto failure; 2989 2990 dns_rdataset_disassociate(&rdataset); 2991 2992 try_private: 2993 if (privatetype == 0) 2994 goto success; 2995 2996 result = dns_db_findrdataset(db, node, ver, privatetype, 2997 0, (isc_stdtime_t) 0, &rdataset, NULL); 2998 if (result == ISC_R_NOTFOUND) 2999 goto success; 3000 if (result != ISC_R_SUCCESS) 3001 goto failure; 3002 3003 for (result = dns_rdataset_first(&rdataset); 3004 result == ISC_R_SUCCESS; 3005 result = dns_rdataset_next(&rdataset)) { 3006 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 3007 dns_rdata_t private = DNS_RDATA_INIT; 3008 dns_rdata_t rdata = DNS_RDATA_INIT; 3009 3010 dns_rdataset_current(&rdataset, &rdata); 3011 if (!dns_nsec3param_fromprivate(&private, &rdata, 3012 buf, sizeof(buf))) 3013 continue; 3014 CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); 3015 if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) 3016 continue; 3017 if (nsec3param.iterations > iterations) 3018 iterations = nsec3param.iterations; 3019 } 3020 if (result != ISC_R_NOMORE) 3021 goto failure; 3022 3023 success: 3024 *iterationsp = iterations; 3025 result = ISC_R_SUCCESS; 3026 3027 failure: 3028 if (node != NULL) 3029 dns_db_detachnode(db, &node); 3030 if (dns_rdataset_isassociated(&rdataset)) 3031 dns_rdataset_disassociate(&rdataset); 3032 return (result); 3033} 3034 3035/* 3036 * Prevent the zone entering a inconsistent state where 3037 * NSEC only DNSKEYs are present with NSEC3 chains. 3038 */ 3039static isc_result_t 3040check_dnssec(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 3041 dns_dbversion_t *ver, dns_diff_t *diff) 3042{ 3043 dns_difftuple_t *tuple; 3044 isc_boolean_t nseconly = ISC_FALSE, nsec3 = ISC_FALSE; 3045 isc_result_t result; 3046 unsigned int iterations = 0, max; 3047 dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); 3048 3049 /* Scan the tuples for an NSEC-only DNSKEY or an NSEC3PARAM */ 3050 for (tuple = ISC_LIST_HEAD(diff->tuples); 3051 tuple != NULL; 3052 tuple = ISC_LIST_NEXT(tuple, link)) { 3053 if (tuple->op != DNS_DIFFOP_ADD) 3054 continue; 3055 3056 if (tuple->rdata.type == dns_rdatatype_dnskey) { 3057 isc_uint8_t alg; 3058 alg = tuple->rdata.data[3]; 3059 if (alg == DST_ALG_RSAMD5 || alg == DST_ALG_RSASHA1 || 3060 alg == DST_ALG_DSA || alg == DST_ALG_ECC) { 3061 nseconly = ISC_TRUE; 3062 break; 3063 } 3064 } else if (tuple->rdata.type == dns_rdatatype_nsec3param) { 3065 nsec3 = ISC_TRUE; 3066 break; 3067 } 3068 } 3069 3070 /* Check existing DB for NSEC-only DNSKEY */ 3071 if (!nseconly) 3072 CHECK(dns_nsec_nseconly(db, ver, &nseconly)); 3073 3074 /* Check existing DB for NSEC3 */ 3075 if (!nsec3) 3076 CHECK(dns_nsec3_activex(db, ver, ISC_FALSE, 3077 privatetype, &nsec3)); 3078 3079 /* Refuse to allow NSEC3 with NSEC-only keys */ 3080 if (nseconly && nsec3) { 3081 update_log(client, zone, ISC_LOG_ERROR, 3082 "NSEC only DNSKEYs and NSEC3 chains not allowed"); 3083 result = DNS_R_REFUSED; 3084 goto failure; 3085 } 3086 3087 /* Verify NSEC3 params */ 3088 CHECK(get_iterations(db, ver, privatetype, &iterations)); 3089 CHECK(dns_nsec3_maxiterations(db, ver, client->mctx, &max)); 3090 if (max != 0 && iterations > max) { 3091 update_log(client, zone, ISC_LOG_ERROR, 3092 "too many NSEC3 iterations (%u) for " 3093 "weakest DNSKEY (%u)", iterations, max); 3094 result = DNS_R_REFUSED; 3095 goto failure; 3096 } 3097 3098 failure: 3099 return (result); 3100} 3101 3102/* 3103 * Delay NSEC3PARAM changes as they need to be applied to the whole zone. 3104 */ 3105static isc_result_t 3106add_nsec3param_records(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, 3107 dns_dbversion_t *ver, dns_diff_t *diff) 3108{ 3109 isc_result_t result = ISC_R_SUCCESS; 3110 dns_difftuple_t *tuple, *newtuple = NULL, *next; 3111 dns_rdata_t rdata = DNS_RDATA_INIT; 3112 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1]; 3113 dns_diff_t temp_diff; 3114 dns_diffop_t op; 3115 isc_boolean_t flag; 3116 dns_name_t *name = dns_zone_getorigin(zone); 3117 dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); 3118 isc_uint32_t ttl = 0; 3119 isc_boolean_t ttl_good = ISC_FALSE; 3120 3121 update_log(client, zone, ISC_LOG_DEBUG(3), 3122 "checking for NSEC3PARAM changes"); 3123 3124 dns_diff_init(diff->mctx, &temp_diff); 3125 3126 /* 3127 * Extract NSEC3PARAM tuples from list. 3128 */ 3129 for (tuple = ISC_LIST_HEAD(diff->tuples); 3130 tuple != NULL; 3131 tuple = next) { 3132 3133 next = ISC_LIST_NEXT(tuple, link); 3134 3135 if (tuple->rdata.type != dns_rdatatype_nsec3param || 3136 !dns_name_equal(name, &tuple->name)) 3137 continue; 3138 ISC_LIST_UNLINK(diff->tuples, tuple, link); 3139 ISC_LIST_APPEND(temp_diff.tuples, tuple, link); 3140 } 3141 3142 /* 3143 * Extract TTL changes pairs, we don't need to convert these to 3144 * delayed changes. 3145 */ 3146 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3147 tuple != NULL; tuple = next) { 3148 if (tuple->op == DNS_DIFFOP_ADD) { 3149 if (!ttl_good) { 3150 /* 3151 * Any adds here will contain the final 3152 * NSEC3PARAM RRset TTL. 3153 */ 3154 ttl = tuple->ttl; 3155 ttl_good = ISC_TRUE; 3156 } 3157 /* 3158 * Walk the temp_diff list looking for the 3159 * corresponding delete. 3160 */ 3161 next = ISC_LIST_HEAD(temp_diff.tuples); 3162 while (next != NULL) { 3163 unsigned char *next_data = next->rdata.data; 3164 unsigned char *tuple_data = tuple->rdata.data; 3165 if (next->op == DNS_DIFFOP_DEL && 3166 next->rdata.length == tuple->rdata.length && 3167 !memcmp(next_data, tuple_data, 3168 next->rdata.length)) { 3169 ISC_LIST_UNLINK(temp_diff.tuples, next, 3170 link); 3171 ISC_LIST_APPEND(diff->tuples, next, 3172 link); 3173 break; 3174 } 3175 next = ISC_LIST_NEXT(next, link); 3176 } 3177 /* 3178 * If we have not found a pair move onto the next 3179 * tuple. 3180 */ 3181 if (next == NULL) { 3182 next = ISC_LIST_NEXT(tuple, link); 3183 continue; 3184 } 3185 /* 3186 * Find the next tuple to be processed before 3187 * unlinking then complete moving the pair to 'diff'. 3188 */ 3189 next = ISC_LIST_NEXT(tuple, link); 3190 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3191 ISC_LIST_APPEND(diff->tuples, tuple, link); 3192 } else 3193 next = ISC_LIST_NEXT(tuple, link); 3194 } 3195 3196 /* 3197 * Preserve any ongoing changes from a BIND 9.6.x upgrade. 3198 * 3199 * Any NSEC3PARAM records with flags other than OPTOUT named 3200 * in managing and should not be touched so revert such changes 3201 * taking into account any TTL change of the NSEC3PARAM RRset. 3202 */ 3203 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3204 tuple != NULL; tuple = next) { 3205 next = ISC_LIST_NEXT(tuple, link); 3206 if ((tuple->rdata.data[1] & ~DNS_NSEC3FLAG_OPTOUT) != 0) { 3207 /* 3208 * If we havn't had any adds then the tuple->ttl must 3209 * be the original ttl and should be used for any 3210 * future changes. 3211 */ 3212 if (!ttl_good) { 3213 ttl = tuple->ttl; 3214 ttl_good = ISC_TRUE; 3215 } 3216 op = (tuple->op == DNS_DIFFOP_DEL) ? 3217 DNS_DIFFOP_ADD : DNS_DIFFOP_DEL; 3218 CHECK(dns_difftuple_create(diff->mctx, op, name, 3219 ttl, &tuple->rdata, 3220 &newtuple)); 3221 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3222 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3223 dns_diff_appendminimal(diff, &tuple); 3224 } 3225 } 3226 3227 /* 3228 * We now have just the actual changes to the NSEC3PARAM RRset. 3229 * Convert the adds to delayed adds and the deletions into delayed 3230 * deletions. 3231 */ 3232 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3233 tuple != NULL; tuple = next) { 3234 /* 3235 * If we havn't had any adds then the tuple->ttl must be the 3236 * original ttl and should be used for any future changes. 3237 */ 3238 if (!ttl_good) { 3239 ttl = tuple->ttl; 3240 ttl_good = ISC_TRUE; 3241 } 3242 if (tuple->op == DNS_DIFFOP_ADD) { 3243 /* 3244 * Look for any deletes which match this ADD ignoring 3245 * OPTOUT. We don't need to explictly remove them as 3246 * they will be removed a side effect of processing 3247 * the add. 3248 */ 3249 next = ISC_LIST_HEAD(temp_diff.tuples); 3250 while (next != NULL) { 3251 unsigned char *next_data = next->rdata.data; 3252 unsigned char *tuple_data = tuple->rdata.data; 3253 if (next->op != DNS_DIFFOP_DEL || 3254 next->rdata.length != tuple->rdata.length || 3255 next_data[0] != tuple_data[0] || 3256 next_data[2] != tuple_data[2] || 3257 next_data[3] != tuple_data[3] || 3258 memcmp(next_data + 4, tuple_data + 4, 3259 tuple->rdata.length - 4)) { 3260 next = ISC_LIST_NEXT(next, link); 3261 continue; 3262 } 3263 ISC_LIST_UNLINK(temp_diff.tuples, next, link); 3264 ISC_LIST_APPEND(diff->tuples, next, link); 3265 next = ISC_LIST_HEAD(temp_diff.tuples); 3266 } 3267 /* 3268 * See if we already have a CREATE request in progress. 3269 */ 3270 dns_nsec3param_toprivate(&tuple->rdata, &rdata, 3271 privatetype, buf, sizeof(buf)); 3272 buf[2] |= DNS_NSEC3FLAG_CREATE; 3273 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3274 3275 if (!flag) { 3276 CHECK(dns_difftuple_create(diff->mctx, 3277 DNS_DIFFOP_ADD, 3278 name, 0, &rdata, 3279 &newtuple)); 3280 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3281 } 3282 3283 /* 3284 * Remove any existing CREATE request to add an 3285 * otherwise indentical chain with a reversed 3286 * OPTOUT state. 3287 */ 3288 buf[2] ^= DNS_NSEC3FLAG_OPTOUT; 3289 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3290 3291 if (flag) { 3292 CHECK(dns_difftuple_create(diff->mctx, 3293 DNS_DIFFOP_DEL, 3294 name, 0, &rdata, 3295 &newtuple)); 3296 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3297 } 3298 3299 /* 3300 * Find the next tuple to be processed and remove the 3301 * temporary add record. 3302 */ 3303 next = ISC_LIST_NEXT(tuple, link); 3304 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, 3305 name, ttl, &tuple->rdata, 3306 &newtuple)); 3307 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3308 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3309 dns_diff_appendminimal(diff, &tuple); 3310 dns_rdata_reset(&rdata); 3311 } else 3312 next = ISC_LIST_NEXT(tuple, link); 3313 } 3314 3315 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3316 tuple != NULL; tuple = next) { 3317 3318 INSIST(ttl_good); 3319 3320 next = ISC_LIST_NEXT(tuple, link); 3321 /* 3322 * See if we already have a REMOVE request in progress. 3323 */ 3324 dns_nsec3param_toprivate(&tuple->rdata, &rdata, privatetype, 3325 buf, sizeof(buf)); 3326 3327 buf[2] |= DNS_NSEC3FLAG_REMOVE | DNS_NSEC3FLAG_NONSEC; 3328 3329 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3330 if (!flag) { 3331 buf[2] &= ~DNS_NSEC3FLAG_NONSEC; 3332 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3333 } 3334 3335 if (!flag) { 3336 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 3337 name, 0, &rdata, &newtuple)); 3338 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3339 } 3340 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 3341 ttl, &tuple->rdata, &newtuple)); 3342 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3343 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3344 dns_diff_appendminimal(diff, &tuple); 3345 dns_rdata_reset(&rdata); 3346 } 3347 3348 result = ISC_R_SUCCESS; 3349 failure: 3350 dns_diff_clear(&temp_diff); 3351 return (result); 3352} 3353 3354static isc_result_t 3355rollback_private(dns_db_t *db, dns_rdatatype_t privatetype, 3356 dns_dbversion_t *ver, dns_diff_t *diff) 3357{ 3358 dns_diff_t temp_diff; 3359 dns_diffop_t op; 3360 dns_difftuple_t *tuple, *newtuple = NULL, *next; 3361 dns_name_t *name = dns_db_origin(db); 3362 isc_mem_t *mctx = diff->mctx; 3363 isc_result_t result; 3364 3365 if (privatetype == 0) 3366 return (ISC_R_SUCCESS); 3367 3368 dns_diff_init(mctx, &temp_diff); 3369 3370 /* 3371 * Extract the changes to be rolled back. 3372 */ 3373 for (tuple = ISC_LIST_HEAD(diff->tuples); 3374 tuple != NULL; tuple = next) { 3375 3376 next = ISC_LIST_NEXT(tuple, link); 3377 3378 if (tuple->rdata.type != privatetype || 3379 !dns_name_equal(name, &tuple->name)) 3380 continue; 3381 3382 /* 3383 * Allow records which indicate that a zone has been 3384 * signed with a DNSKEY to be be removed. 3385 */ 3386 if (tuple->op == DNS_DIFFOP_DEL && 3387 tuple->rdata.length == 5 && 3388 tuple->rdata.data[0] != 0 && 3389 tuple->rdata.data[4] != 0) 3390 continue; 3391 3392 ISC_LIST_UNLINK(diff->tuples, tuple, link); 3393 ISC_LIST_PREPEND(temp_diff.tuples, tuple, link); 3394 } 3395 3396 /* 3397 * Rollback the changes. 3398 */ 3399 while ((tuple = ISC_LIST_HEAD(temp_diff.tuples)) != NULL) { 3400 op = (tuple->op == DNS_DIFFOP_DEL) ? 3401 DNS_DIFFOP_ADD : DNS_DIFFOP_DEL; 3402 CHECK(dns_difftuple_create(mctx, op, name, tuple->ttl, 3403 &tuple->rdata, &newtuple)); 3404 CHECK(do_one_tuple(&newtuple, db, ver, &temp_diff)); 3405 } 3406 result = ISC_R_SUCCESS; 3407 3408 failure: 3409 dns_diff_clear(&temp_diff); 3410 return (result); 3411} 3412 3413/* 3414 * Add records to cause the delayed signing of the zone by added DNSKEY 3415 * to remove the RRSIG records generated by a deleted DNSKEY. 3416 */ 3417static isc_result_t 3418add_signing_records(dns_db_t *db, dns_rdatatype_t privatetype, 3419 dns_dbversion_t *ver, dns_diff_t *diff) 3420{ 3421 dns_difftuple_t *tuple, *newtuple = NULL, *next; 3422 dns_rdata_dnskey_t dnskey; 3423 dns_rdata_t rdata = DNS_RDATA_INIT; 3424 isc_boolean_t flag; 3425 isc_region_t r; 3426 isc_result_t result = ISC_R_SUCCESS; 3427 isc_uint16_t keyid; 3428 unsigned char buf[5]; 3429 dns_name_t *name = dns_db_origin(db); 3430 dns_diff_t temp_diff; 3431 3432 dns_diff_init(diff->mctx, &temp_diff); 3433 3434 /* 3435 * Extract the DNSKEY tuples from the list. 3436 */ 3437 for (tuple = ISC_LIST_HEAD(diff->tuples); 3438 tuple != NULL; tuple = next) { 3439 3440 next = ISC_LIST_NEXT(tuple, link); 3441 3442 if (tuple->rdata.type != dns_rdatatype_dnskey) 3443 continue; 3444 3445 ISC_LIST_UNLINK(diff->tuples, tuple, link); 3446 ISC_LIST_APPEND(temp_diff.tuples, tuple, link); 3447 } 3448 3449 /* 3450 * Extract TTL changes pairs, we don't need signing records for these. 3451 */ 3452 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3453 tuple != NULL; tuple = next) { 3454 if (tuple->op == DNS_DIFFOP_ADD) { 3455 /* 3456 * Walk the temp_diff list looking for the 3457 * corresponding delete. 3458 */ 3459 next = ISC_LIST_HEAD(temp_diff.tuples); 3460 while (next != NULL) { 3461 unsigned char *next_data = next->rdata.data; 3462 unsigned char *tuple_data = tuple->rdata.data; 3463 if (next->op == DNS_DIFFOP_DEL && 3464 dns_name_equal(&tuple->name, &next->name) && 3465 next->rdata.length == tuple->rdata.length && 3466 !memcmp(next_data, tuple_data, 3467 next->rdata.length)) { 3468 ISC_LIST_UNLINK(temp_diff.tuples, next, 3469 link); 3470 ISC_LIST_APPEND(diff->tuples, next, 3471 link); 3472 break; 3473 } 3474 next = ISC_LIST_NEXT(next, link); 3475 } 3476 /* 3477 * If we have not found a pair move onto the next 3478 * tuple. 3479 */ 3480 if (next == NULL) { 3481 next = ISC_LIST_NEXT(tuple, link); 3482 continue; 3483 } 3484 /* 3485 * Find the next tuple to be processed before 3486 * unlinking then complete moving the pair to 'diff'. 3487 */ 3488 next = ISC_LIST_NEXT(tuple, link); 3489 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3490 ISC_LIST_APPEND(diff->tuples, tuple, link); 3491 } else 3492 next = ISC_LIST_NEXT(tuple, link); 3493 } 3494 3495 /* 3496 * Process the remaining DNSKEY entries. 3497 */ 3498 for (tuple = ISC_LIST_HEAD(temp_diff.tuples); 3499 tuple != NULL; 3500 tuple = ISC_LIST_HEAD(temp_diff.tuples)) { 3501 3502 ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); 3503 ISC_LIST_APPEND(diff->tuples, tuple, link); 3504 3505 dns_rdata_tostruct(&tuple->rdata, &dnskey, NULL); 3506 if ((dnskey.flags & 3507 (DNS_KEYFLAG_OWNERMASK|DNS_KEYTYPE_NOAUTH)) 3508 != DNS_KEYOWNER_ZONE) 3509 continue; 3510 3511 dns_rdata_toregion(&tuple->rdata, &r); 3512 3513 keyid = dst_region_computeid(&r, dnskey.algorithm); 3514 3515 buf[0] = dnskey.algorithm; 3516 buf[1] = (keyid & 0xff00) >> 8; 3517 buf[2] = (keyid & 0xff); 3518 buf[3] = (tuple->op == DNS_DIFFOP_ADD) ? 0 : 1; 3519 buf[4] = 0; 3520 rdata.data = buf; 3521 rdata.length = sizeof(buf); 3522 rdata.type = privatetype; 3523 rdata.rdclass = tuple->rdata.rdclass; 3524 3525 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3526 if (flag) 3527 continue; 3528 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, 3529 name, 0, &rdata, &newtuple)); 3530 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3531 INSIST(newtuple == NULL); 3532 /* 3533 * Remove any record which says this operation has already 3534 * completed. 3535 */ 3536 buf[4] = 1; 3537 CHECK(rr_exists(db, ver, name, &rdata, &flag)); 3538 if (flag) { 3539 CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, 3540 name, 0, &rdata, &newtuple)); 3541 CHECK(do_one_tuple(&newtuple, db, ver, diff)); 3542 INSIST(newtuple == NULL); 3543 } 3544 } 3545 3546 failure: 3547 dns_diff_clear(&temp_diff); 3548 return (result); 3549} 3550 3551static isc_boolean_t 3552isdnssec(dns_db_t *db, dns_dbversion_t *ver, dns_rdatatype_t privatetype) { 3553 isc_result_t result; 3554 isc_boolean_t build_nsec, build_nsec3; 3555 3556 if (dns_db_issecure(db)) 3557 return (ISC_TRUE); 3558 3559 result = dns_private_chains(db, ver, privatetype, 3560 &build_nsec, &build_nsec3); 3561 RUNTIME_CHECK(result == ISC_R_SUCCESS); 3562 return (build_nsec || build_nsec3); 3563} 3564 3565static void 3566update_action(isc_task_t *task, isc_event_t *event) { 3567 update_event_t *uev = (update_event_t *) event; 3568 dns_zone_t *zone = uev->zone; 3569 ns_client_t *client = (ns_client_t *)event->ev_arg; 3570 3571 isc_result_t result; 3572 dns_db_t *db = NULL; 3573 dns_dbversion_t *oldver = NULL; 3574 dns_dbversion_t *ver = NULL; 3575 dns_diff_t diff; /* Pending updates. */ 3576 dns_diff_t temp; /* Pending RR existence assertions. */ 3577 isc_boolean_t soa_serial_changed = ISC_FALSE; 3578 isc_mem_t *mctx = client->mctx; 3579 dns_rdatatype_t covers; 3580 dns_message_t *request = client->message; 3581 dns_rdataclass_t zoneclass; 3582 dns_name_t *zonename; 3583 dns_ssutable_t *ssutable = NULL; 3584 dns_fixedname_t tmpnamefixed; 3585 dns_name_t *tmpname = NULL; 3586 unsigned int options; 3587 dns_difftuple_t *tuple; 3588 dns_rdata_dnskey_t dnskey; 3589 isc_boolean_t had_dnskey; 3590 dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); 3591 3592 INSIST(event->ev_type == DNS_EVENT_UPDATE); 3593 3594 dns_diff_init(mctx, &diff); 3595 dns_diff_init(mctx, &temp); 3596 3597 CHECK(dns_zone_getdb(zone, &db)); 3598 zonename = dns_db_origin(db); 3599 zoneclass = dns_db_class(db); 3600 dns_zone_getssutable(zone, &ssutable); 3601 3602 /* 3603 * Update message processing can leak record existance information 3604 * so check that we are allowed to query this zone. Additionally 3605 * if we would refuse all updates for this zone we bail out here. 3606 */ 3607 CHECK(checkqueryacl(client, dns_zone_getqueryacl(zone), zonename, 3608 dns_zone_getupdateacl(zone), ssutable)); 3609 3610 /* 3611 * Get old and new versions now that queryacl has been checked. 3612 */ 3613 dns_db_currentversion(db, &oldver); 3614 CHECK(dns_db_newversion(db, &ver)); 3615 3616 /* 3617 * Check prerequisites. 3618 */ 3619 3620 for (result = dns_message_firstname(request, DNS_SECTION_PREREQUISITE); 3621 result == ISC_R_SUCCESS; 3622 result = dns_message_nextname(request, DNS_SECTION_PREREQUISITE)) 3623 { 3624 dns_name_t *name = NULL; 3625 dns_rdata_t rdata = DNS_RDATA_INIT; 3626 dns_ttl_t ttl; 3627 dns_rdataclass_t update_class; 3628 isc_boolean_t flag; 3629 3630 get_current_rr(request, DNS_SECTION_PREREQUISITE, zoneclass, 3631 &name, &rdata, &covers, &ttl, &update_class); 3632 3633 if (ttl != 0) 3634 PREREQFAILC(DNS_R_FORMERR, 3635 "prerequisite TTL is not zero"); 3636 3637 if (! dns_name_issubdomain(name, zonename)) 3638 PREREQFAILN(DNS_R_NOTZONE, name, 3639 "prerequisite name is out of zone"); 3640 3641 if (update_class == dns_rdataclass_any) { 3642 if (rdata.length != 0) 3643 PREREQFAILC(DNS_R_FORMERR, 3644 "class ANY prerequisite " 3645 "RDATA is not empty"); 3646 if (rdata.type == dns_rdatatype_any) { 3647 CHECK(name_exists(db, ver, name, &flag)); 3648 if (! flag) { 3649 PREREQFAILN(DNS_R_NXDOMAIN, name, 3650 "'name in use' " 3651 "prerequisite not " 3652 "satisfied"); 3653 } 3654 } else { 3655 CHECK(rrset_exists(db, ver, name, 3656 rdata.type, covers, &flag)); 3657 if (! flag) { 3658 /* RRset does not exist. */ 3659 PREREQFAILNT(DNS_R_NXRRSET, name, rdata.type, 3660 "'rrset exists (value independent)' " 3661 "prerequisite not satisfied"); 3662 } 3663 } 3664 } else if (update_class == dns_rdataclass_none) { 3665 if (rdata.length != 0) 3666 PREREQFAILC(DNS_R_FORMERR, 3667 "class NONE prerequisite " 3668 "RDATA is not empty"); 3669 if (rdata.type == dns_rdatatype_any) { 3670 CHECK(name_exists(db, ver, name, &flag)); 3671 if (flag) { 3672 PREREQFAILN(DNS_R_YXDOMAIN, name, 3673 "'name not in use' " 3674 "prerequisite not " 3675 "satisfied"); 3676 } 3677 } else { 3678 CHECK(rrset_exists(db, ver, name, 3679 rdata.type, covers, &flag)); 3680 if (flag) { 3681 /* RRset exists. */ 3682 PREREQFAILNT(DNS_R_YXRRSET, name, 3683 rdata.type, 3684 "'rrset does not exist' " 3685 "prerequisite not " 3686 "satisfied"); 3687 } 3688 } 3689 } else if (update_class == zoneclass) { 3690 /* "temp<rr.name, rr.type> += rr;" */ 3691 result = temp_append(&temp, name, &rdata); 3692 if (result != ISC_R_SUCCESS) { 3693 UNEXPECTED_ERROR(__FILE__, __LINE__, 3694 "temp entry creation failed: %s", 3695 dns_result_totext(result)); 3696 FAIL(ISC_R_UNEXPECTED); 3697 } 3698 } else { 3699 PREREQFAILC(DNS_R_FORMERR, "malformed prerequisite"); 3700 } 3701 } 3702 if (result != ISC_R_NOMORE) 3703 FAIL(result); 3704 3705 /* 3706 * Perform the final check of the "rrset exists (value dependent)" 3707 * prerequisites. 3708 */ 3709 if (ISC_LIST_HEAD(temp.tuples) != NULL) { 3710 dns_rdatatype_t type; 3711 3712 /* 3713 * Sort the prerequisite records by owner name, 3714 * type, and rdata. 3715 */ 3716 result = dns_diff_sort(&temp, temp_order); 3717 if (result != ISC_R_SUCCESS) 3718 FAILC(result, "'RRset exists (value dependent)' " 3719 "prerequisite not satisfied"); 3720 3721 dns_fixedname_init(&tmpnamefixed); 3722 tmpname = dns_fixedname_name(&tmpnamefixed); 3723 result = temp_check(mctx, &temp, db, ver, tmpname, &type); 3724 if (result != ISC_R_SUCCESS) 3725 FAILNT(result, tmpname, type, 3726 "'RRset exists (value dependent)' " 3727 "prerequisite not satisfied"); 3728 } 3729 3730 update_log(client, zone, LOGLEVEL_DEBUG, 3731 "prerequisites are OK"); 3732 3733 /* 3734 * Check Requestor's Permissions. It seems a bit silly to do this 3735 * only after prerequisite testing, but that is what RFC2136 says. 3736 */ 3737 if (ssutable == NULL) 3738 CHECK(checkupdateacl(client, dns_zone_getupdateacl(zone), 3739 "update", zonename, ISC_FALSE, ISC_FALSE)); 3740 else if (client->signer == NULL && !TCPCLIENT(client)) 3741 CHECK(checkupdateacl(client, NULL, "update", zonename, 3742 ISC_FALSE, ISC_TRUE)); 3743 3744 if (dns_zone_getupdatedisabled(zone)) 3745 FAILC(DNS_R_REFUSED, "dynamic update temporarily disabled " 3746 "because the zone is frozen. Use " 3747 "'rndc thaw' to re-enable updates."); 3748 3749 /* 3750 * Perform the Update Section Prescan. 3751 */ 3752 3753 for (result = dns_message_firstname(request, DNS_SECTION_UPDATE); 3754 result == ISC_R_SUCCESS; 3755 result = dns_message_nextname(request, DNS_SECTION_UPDATE)) 3756 { 3757 dns_name_t *name = NULL; 3758 dns_rdata_t rdata = DNS_RDATA_INIT; 3759 dns_ttl_t ttl; 3760 dns_rdataclass_t update_class; 3761 get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, 3762 &name, &rdata, &covers, &ttl, &update_class); 3763 3764 if (! dns_name_issubdomain(name, zonename)) 3765 FAILC(DNS_R_NOTZONE, 3766 "update RR is outside zone"); 3767 if (update_class == zoneclass) { 3768 /* 3769 * Check for meta-RRs. The RFC2136 pseudocode says 3770 * check for ANY|AXFR|MAILA|MAILB, but the text adds 3771 * "or any other QUERY metatype" 3772 */ 3773 if (dns_rdatatype_ismeta(rdata.type)) { 3774 FAILC(DNS_R_FORMERR, 3775 "meta-RR in update"); 3776 } 3777 result = dns_zone_checknames(zone, name, &rdata); 3778 if (result != ISC_R_SUCCESS) 3779 FAIL(DNS_R_REFUSED); 3780 } else if (update_class == dns_rdataclass_any) { 3781 if (ttl != 0 || rdata.length != 0 || 3782 (dns_rdatatype_ismeta(rdata.type) && 3783 rdata.type != dns_rdatatype_any)) 3784 FAILC(DNS_R_FORMERR, 3785 "meta-RR in update"); 3786 } else if (update_class == dns_rdataclass_none) { 3787 if (ttl != 0 || 3788 dns_rdatatype_ismeta(rdata.type)) 3789 FAILC(DNS_R_FORMERR, 3790 "meta-RR in update"); 3791 } else { 3792 update_log(client, zone, ISC_LOG_WARNING, 3793 "update RR has incorrect class %d", 3794 update_class); 3795 FAIL(DNS_R_FORMERR); 3796 } 3797 3798 /* 3799 * draft-ietf-dnsind-simple-secure-update-01 says 3800 * "Unlike traditional dynamic update, the client 3801 * is forbidden from updating NSEC records." 3802 */ 3803 if (rdata.type == dns_rdatatype_nsec3) { 3804 FAILC(DNS_R_REFUSED, 3805 "explicit NSEC3 updates are not allowed " 3806 "in secure zones"); 3807 } else if (rdata.type == dns_rdatatype_nsec) { 3808 FAILC(DNS_R_REFUSED, 3809 "explicit NSEC updates are not allowed " 3810 "in secure zones"); 3811 } else if (rdata.type == dns_rdatatype_rrsig && 3812 !dns_name_equal(name, zonename)) { 3813 FAILC(DNS_R_REFUSED, 3814 "explicit RRSIG updates are currently " 3815 "not supported in secure zones except " 3816 "at the apex"); 3817 } 3818 3819 if (ssutable != NULL) { 3820 isc_netaddr_t *tcpaddr, netaddr; 3821 dst_key_t *tsigkey = NULL; 3822 /* 3823 * If this is a TCP connection then pass the 3824 * address of the client through for tcp-self 3825 * and 6to4-self otherwise pass NULL. This 3826 * provides weak address based authentication. 3827 */ 3828 if (TCPCLIENT(client)) { 3829 isc_netaddr_fromsockaddr(&netaddr, 3830 &client->peeraddr); 3831 tcpaddr = &netaddr; 3832 } else 3833 tcpaddr = NULL; 3834 3835 if (client->message->tsigkey != NULL) 3836 tsigkey = client->message->tsigkey->key; 3837 3838 if (rdata.type != dns_rdatatype_any) { 3839 if (!dns_ssutable_checkrules(ssutable, 3840 client->signer, 3841 name, tcpaddr, 3842 rdata.type, 3843 tsigkey)) 3844 FAILC(DNS_R_REFUSED, 3845 "rejected by secure update"); 3846 } else { 3847 if (!ssu_checkall(db, ver, name, ssutable, 3848 client->signer, tcpaddr, 3849 tsigkey)) 3850 FAILC(DNS_R_REFUSED, 3851 "rejected by secure update"); 3852 } 3853 } 3854 } 3855 if (result != ISC_R_NOMORE) 3856 FAIL(result); 3857 3858 update_log(client, zone, LOGLEVEL_DEBUG, 3859 "update section prescan OK"); 3860 3861 /* 3862 * Process the Update Section. 3863 */ 3864 3865 options = dns_zone_getoptions(zone); 3866 for (result = dns_message_firstname(request, DNS_SECTION_UPDATE); 3867 result == ISC_R_SUCCESS; 3868 result = dns_message_nextname(request, DNS_SECTION_UPDATE)) 3869 { 3870 dns_name_t *name = NULL; 3871 dns_rdata_t rdata = DNS_RDATA_INIT; 3872 dns_ttl_t ttl; 3873 dns_rdataclass_t update_class; 3874 isc_boolean_t flag; 3875 3876 get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, 3877 &name, &rdata, &covers, &ttl, &update_class); 3878 3879 if (update_class == zoneclass) { 3880 3881 /* 3882 * RFC1123 doesn't allow MF and MD in master zones. */ 3883 if (rdata.type == dns_rdatatype_md || 3884 rdata.type == dns_rdatatype_mf) { 3885 char typebuf[DNS_RDATATYPE_FORMATSIZE]; 3886 3887 dns_rdatatype_format(rdata.type, typebuf, 3888 sizeof(typebuf)); 3889 update_log(client, zone, LOGLEVEL_PROTOCOL, 3890 "attempt to add %s ignored", 3891 typebuf); 3892 continue; 3893 } 3894 if ((rdata.type == dns_rdatatype_ns || 3895 rdata.type == dns_rdatatype_dname) && 3896 dns_name_iswildcard(name)) { 3897 char typebuf[DNS_RDATATYPE_FORMATSIZE]; 3898 3899 dns_rdatatype_format(rdata.type, typebuf, 3900 sizeof(typebuf)); 3901 update_log(client, zone, 3902 LOGLEVEL_PROTOCOL, 3903 "attempt to add wildcard %s record " 3904 "ignored", typebuf); 3905 continue; 3906 } 3907 if (rdata.type == dns_rdatatype_cname) { 3908 CHECK(cname_incompatible_rrset_exists(db, ver, 3909 name, 3910 &flag)); 3911 if (flag) { 3912 update_log(client, zone, 3913 LOGLEVEL_PROTOCOL, 3914 "attempt to add CNAME " 3915 "alongside non-CNAME " 3916 "ignored"); 3917 continue; 3918 } 3919 } else { 3920 CHECK(rrset_exists(db, ver, name, 3921 dns_rdatatype_cname, 0, 3922 &flag)); 3923 if (flag && 3924 ! dns_rdatatype_isdnssec(rdata.type)) 3925 { 3926 update_log(client, zone, 3927 LOGLEVEL_PROTOCOL, 3928 "attempt to add non-CNAME " 3929 "alongside CNAME ignored"); 3930 continue; 3931 } 3932 } 3933 if (rdata.type == dns_rdatatype_soa) { 3934 isc_boolean_t ok; 3935 CHECK(rrset_exists(db, ver, name, 3936 dns_rdatatype_soa, 0, 3937 &flag)); 3938 if (! flag) { 3939 update_log(client, zone, 3940 LOGLEVEL_PROTOCOL, 3941 "attempt to create 2nd " 3942 "SOA ignored"); 3943 continue; 3944 } 3945 CHECK(check_soa_increment(db, ver, &rdata, 3946 &ok)); 3947 if (! ok) { 3948 update_log(client, zone, 3949 LOGLEVEL_PROTOCOL, 3950 "SOA update failed to " 3951 "increment serial, " 3952 "ignoring it"); 3953 continue; 3954 } 3955 soa_serial_changed = ISC_TRUE; 3956 } 3957 3958 if (rdata.type == privatetype) { 3959 update_log(client, zone, LOGLEVEL_PROTOCOL, 3960 "attempt to add a private type " 3961 "(%u) record rejected internal " 3962 "use only", privatetype); 3963 continue; 3964 } 3965 3966 if (rdata.type == dns_rdatatype_nsec3param) { 3967 /* 3968 * Ignore attempts to add NSEC3PARAM records 3969 * with any flags other than OPTOUT. 3970 */ 3971 if ((rdata.data[1] & ~DNS_NSEC3FLAG_OPTOUT) != 0) { 3972 update_log(client, zone, 3973 LOGLEVEL_PROTOCOL, 3974 "attempt to add NSEC3PARAM " 3975 "record with non OPTOUT " 3976 "flag"); 3977 continue; 3978 } 3979 } 3980 3981 if ((options & DNS_ZONEOPT_CHECKWILDCARD) != 0 && 3982 dns_name_internalwildcard(name)) { 3983 char namestr[DNS_NAME_FORMATSIZE]; 3984 dns_name_format(name, namestr, 3985 sizeof(namestr)); 3986 update_log(client, zone, LOGLEVEL_PROTOCOL, 3987 "warning: ownername '%s' contains " 3988 "a non-terminal wildcard", namestr); 3989 } 3990 3991 if (isc_log_wouldlog(ns_g_lctx, LOGLEVEL_PROTOCOL)) { 3992 char namestr[DNS_NAME_FORMATSIZE]; 3993 char typestr[DNS_RDATATYPE_FORMATSIZE]; 3994 dns_name_format(name, namestr, 3995 sizeof(namestr)); 3996 dns_rdatatype_format(rdata.type, typestr, 3997 sizeof(typestr)); 3998 update_log(client, zone, LOGLEVEL_PROTOCOL, 3999 "adding an RR at '%s' %s", 4000 namestr, typestr); 4001 } 4002 4003 /* Prepare the affected RRset for the addition. */ 4004 { 4005 add_rr_prepare_ctx_t ctx; 4006 ctx.db = db; 4007 ctx.ver = ver; 4008 ctx.diff = &diff; 4009 ctx.name = name; 4010 ctx.update_rr = &rdata; 4011 ctx.update_rr_ttl = ttl; 4012 ctx.ignore_add = ISC_FALSE; 4013 dns_diff_init(mctx, &ctx.del_diff); 4014 dns_diff_init(mctx, &ctx.add_diff); 4015 CHECK(foreach_rr(db, ver, name, rdata.type, 4016 covers, add_rr_prepare_action, 4017 &ctx)); 4018 4019 if (ctx.ignore_add) { 4020 dns_diff_clear(&ctx.del_diff); 4021 dns_diff_clear(&ctx.add_diff); 4022 } else { 4023 CHECK(do_diff(&ctx.del_diff, db, ver, 4024 &diff)); 4025 CHECK(do_diff(&ctx.add_diff, db, ver, 4026 &diff)); 4027 CHECK(update_one_rr(db, ver, &diff, 4028 DNS_DIFFOP_ADD, 4029 name, ttl, &rdata)); 4030 } 4031 } 4032 } else if (update_class == dns_rdataclass_any) { 4033 if (rdata.type == dns_rdatatype_any) { 4034 if (isc_log_wouldlog(ns_g_lctx, 4035 LOGLEVEL_PROTOCOL)) 4036 { 4037 char namestr[DNS_NAME_FORMATSIZE]; 4038 dns_name_format(name, namestr, 4039 sizeof(namestr)); 4040 update_log(client, zone, 4041 LOGLEVEL_PROTOCOL, 4042 "delete all rrsets from " 4043 "name '%s'", namestr); 4044 } 4045 if (dns_name_equal(name, zonename)) { 4046 CHECK(delete_if(type_not_soa_nor_ns_p, 4047 db, ver, name, 4048 dns_rdatatype_any, 0, 4049 &rdata, &diff)); 4050 } else { 4051 CHECK(delete_if(type_not_dnssec, 4052 db, ver, name, 4053 dns_rdatatype_any, 0, 4054 &rdata, &diff)); 4055 } 4056 } else if (dns_name_equal(name, zonename) && 4057 (rdata.type == dns_rdatatype_soa || 4058 rdata.type == dns_rdatatype_ns)) { 4059 update_log(client, zone, LOGLEVEL_PROTOCOL, 4060 "attempt to delete all SOA " 4061 "or NS records ignored"); 4062 continue; 4063 } else { 4064 if (isc_log_wouldlog(ns_g_lctx, 4065 LOGLEVEL_PROTOCOL)) 4066 { 4067 char namestr[DNS_NAME_FORMATSIZE]; 4068 char typestr[DNS_RDATATYPE_FORMATSIZE]; 4069 dns_name_format(name, namestr, 4070 sizeof(namestr)); 4071 dns_rdatatype_format(rdata.type, 4072 typestr, 4073 sizeof(typestr)); 4074 update_log(client, zone, 4075 LOGLEVEL_PROTOCOL, 4076 "deleting rrset at '%s' %s", 4077 namestr, typestr); 4078 } 4079 CHECK(delete_if(true_p, db, ver, name, 4080 rdata.type, covers, &rdata, 4081 &diff)); 4082 } 4083 } else if (update_class == dns_rdataclass_none) { 4084 char namestr[DNS_NAME_FORMATSIZE]; 4085 char typestr[DNS_RDATATYPE_FORMATSIZE]; 4086 4087 /* 4088 * The (name == zonename) condition appears in 4089 * RFC2136 3.4.2.4 but is missing from the pseudocode. 4090 */ 4091 if (dns_name_equal(name, zonename)) { 4092 if (rdata.type == dns_rdatatype_soa) { 4093 update_log(client, zone, 4094 LOGLEVEL_PROTOCOL, 4095 "attempt to delete SOA " 4096 "ignored"); 4097 continue; 4098 } 4099 if (rdata.type == dns_rdatatype_ns) { 4100 int count; 4101 CHECK(rr_count(db, ver, name, 4102 dns_rdatatype_ns, 4103 0, &count)); 4104 if (count == 1) { 4105 update_log(client, zone, 4106 LOGLEVEL_PROTOCOL, 4107 "attempt to " 4108 "delete last " 4109 "NS ignored"); 4110 continue; 4111 } 4112 } 4113 } 4114 dns_name_format(name, namestr, sizeof(namestr)); 4115 dns_rdatatype_format(rdata.type, typestr, 4116 sizeof(typestr)); 4117 update_log(client, zone, LOGLEVEL_PROTOCOL, 4118 "deleting an RR at %s %s", namestr, typestr); 4119 CHECK(delete_if(rr_equal_p, db, ver, name, rdata.type, 4120 covers, &rdata, &diff)); 4121 } 4122 } 4123 if (result != ISC_R_NOMORE) 4124 FAIL(result); 4125 4126 /* 4127 * Check that any changes to DNSKEY/NSEC3PARAM records make sense. 4128 * If they don't then back out all changes to DNSKEY/NSEC3PARAM 4129 * records. 4130 */ 4131 if (! ISC_LIST_EMPTY(diff.tuples)) 4132 CHECK(check_dnssec(client, zone, db, ver, &diff)); 4133 4134 if (! ISC_LIST_EMPTY(diff.tuples)) { 4135 unsigned int errors = 0; 4136 CHECK(dns_zone_nscheck(zone, db, ver, &errors)); 4137 if (errors != 0) { 4138 update_log(client, zone, LOGLEVEL_PROTOCOL, 4139 "update rejected: post update name server " 4140 "sanity check failed"); 4141 result = DNS_R_REFUSED; 4142 goto failure; 4143 } 4144 } 4145 4146 /* 4147 * If any changes were made, increment the SOA serial number, 4148 * update RRSIGs and NSECs (if zone is secure), and write the update 4149 * to the journal. 4150 */ 4151 if (! ISC_LIST_EMPTY(diff.tuples)) { 4152 char *journalfile; 4153 dns_journal_t *journal; 4154 isc_boolean_t has_dnskey; 4155 4156 /* 4157 * Increment the SOA serial, but only if it was not 4158 * changed as a result of an update operation. 4159 */ 4160 if (! soa_serial_changed) { 4161 CHECK(increment_soa_serial(db, ver, &diff, mctx)); 4162 } 4163 4164 CHECK(check_mx(client, zone, db, ver, &diff)); 4165 4166 CHECK(remove_orphaned_ds(db, ver, &diff)); 4167 4168 CHECK(rrset_exists(db, ver, zonename, dns_rdatatype_dnskey, 4169 0, &has_dnskey)); 4170 4171#define ALLOW_SECURE_TO_INSECURE(zone) \ 4172 ((dns_zone_getoptions(zone) & DNS_ZONEOPT_SECURETOINSECURE) != 0) 4173 4174 if (!ALLOW_SECURE_TO_INSECURE(zone)) { 4175 CHECK(rrset_exists(db, oldver, zonename, 4176 dns_rdatatype_dnskey, 0, 4177 &had_dnskey)); 4178 if (had_dnskey && !has_dnskey) { 4179 update_log(client, zone, LOGLEVEL_PROTOCOL, 4180 "update rejected: all DNSKEY " 4181 "records removed and " 4182 "'dnssec-secure-to-insecure' " 4183 "not set"); 4184 result = DNS_R_REFUSED; 4185 goto failure; 4186 } 4187 } 4188 4189 CHECK(rollback_private(db, privatetype, ver, &diff)); 4190 4191 CHECK(add_signing_records(db, privatetype, ver, &diff)); 4192 4193 CHECK(add_nsec3param_records(client, zone, db, ver, &diff)); 4194 4195 if (!has_dnskey) { 4196 /* 4197 * We are transitioning from secure to insecure. 4198 * Cause all NSEC3 chains to be deleted. When the 4199 * the last signature for the DNSKEY records are 4200 * remove any NSEC chain present will also be removed. 4201 */ 4202 CHECK(dns_nsec3param_deletechains(db, ver, zone, 4203 &diff)); 4204 } else if (has_dnskey && isdnssec(db, ver, privatetype)) { 4205 isc_uint32_t interval; 4206 interval = dns_zone_getsigvalidityinterval(zone); 4207 result = update_signatures(client, zone, db, oldver, 4208 ver, &diff, interval); 4209 if (result != ISC_R_SUCCESS) { 4210 update_log(client, zone, 4211 ISC_LOG_ERROR, 4212 "RRSIG/NSEC/NSEC3 update failed: %s", 4213 isc_result_totext(result)); 4214 goto failure; 4215 } 4216 } 4217 4218 journalfile = dns_zone_getjournal(zone); 4219 if (journalfile != NULL) { 4220 update_log(client, zone, LOGLEVEL_DEBUG, 4221 "writing journal %s", journalfile); 4222 4223 journal = NULL; 4224 result = dns_journal_open(mctx, journalfile, 4225 ISC_TRUE, &journal); 4226 if (result != ISC_R_SUCCESS) 4227 FAILS(result, "journal open failed"); 4228 4229 result = dns_journal_write_transaction(journal, &diff); 4230 if (result != ISC_R_SUCCESS) { 4231 dns_journal_destroy(&journal); 4232 FAILS(result, "journal write failed"); 4233 } 4234 4235 dns_journal_destroy(&journal); 4236 } 4237 4238 /* 4239 * XXXRTH Just a note that this committing code will have 4240 * to change to handle databases that need two-phase 4241 * commit, but this isn't a priority. 4242 */ 4243 update_log(client, zone, LOGLEVEL_DEBUG, 4244 "committing update transaction"); 4245 4246 dns_db_closeversion(db, &ver, ISC_TRUE); 4247 4248 /* 4249 * Mark the zone as dirty so that it will be written to disk. 4250 */ 4251 dns_zone_markdirty(zone); 4252 4253 /* 4254 * Notify slaves of the change we just made. 4255 */ 4256 dns_zone_notify(zone); 4257 4258 /* 4259 * Cause the zone to be signed with the key that we 4260 * have just added or have the corresponding signatures 4261 * deleted. 4262 * 4263 * Note: we are already committed to this course of action. 4264 */ 4265 for (tuple = ISC_LIST_HEAD(diff.tuples); 4266 tuple != NULL; 4267 tuple = ISC_LIST_NEXT(tuple, link)) { 4268 isc_region_t r; 4269 dns_secalg_t algorithm; 4270 isc_uint16_t keyid; 4271 4272 if (tuple->rdata.type != dns_rdatatype_dnskey) 4273 continue; 4274 4275 dns_rdata_tostruct(&tuple->rdata, &dnskey, NULL); 4276 if ((dnskey.flags & 4277 (DNS_KEYFLAG_OWNERMASK|DNS_KEYTYPE_NOAUTH)) 4278 != DNS_KEYOWNER_ZONE) 4279 continue; 4280 4281 dns_rdata_toregion(&tuple->rdata, &r); 4282 algorithm = dnskey.algorithm; 4283 keyid = dst_region_computeid(&r, algorithm); 4284 4285 result = dns_zone_signwithkey(zone, algorithm, keyid, 4286 ISC_TF(tuple->op == DNS_DIFFOP_DEL)); 4287 if (result != ISC_R_SUCCESS) { 4288 update_log(client, zone, ISC_LOG_ERROR, 4289 "dns_zone_signwithkey failed: %s", 4290 dns_result_totext(result)); 4291 } 4292 } 4293 4294 /* 4295 * Cause the zone to add/delete NSEC3 chains for the 4296 * deferred NSEC3PARAM changes. 4297 * 4298 * Note: we are already committed to this course of action. 4299 */ 4300 for (tuple = ISC_LIST_HEAD(diff.tuples); 4301 tuple != NULL; 4302 tuple = ISC_LIST_NEXT(tuple, link)) { 4303 unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; 4304 dns_rdata_t rdata = DNS_RDATA_INIT; 4305 dns_rdata_nsec3param_t nsec3param; 4306 4307 if (tuple->rdata.type != privatetype || 4308 tuple->op != DNS_DIFFOP_ADD) 4309 continue; 4310 4311 if (!dns_nsec3param_fromprivate(&tuple->rdata, &rdata, 4312 buf, sizeof(buf))) 4313 continue; 4314 dns_rdata_tostruct(&rdata, &nsec3param, NULL); 4315 if (nsec3param.flags == 0) 4316 continue; 4317 4318 result = dns_zone_addnsec3chain(zone, &nsec3param); 4319 if (result != ISC_R_SUCCESS) { 4320 update_log(client, zone, ISC_LOG_ERROR, 4321 "dns_zone_addnsec3chain failed: %s", 4322 dns_result_totext(result)); 4323 } 4324 } 4325 } else { 4326 update_log(client, zone, LOGLEVEL_DEBUG, "redundant request"); 4327 dns_db_closeversion(db, &ver, ISC_TRUE); 4328 } 4329 result = ISC_R_SUCCESS; 4330 goto common; 4331 4332 failure: 4333 /* 4334 * The reason for failure should have been logged at this point. 4335 */ 4336 if (ver != NULL) { 4337 update_log(client, zone, LOGLEVEL_DEBUG, 4338 "rolling back"); 4339 dns_db_closeversion(db, &ver, ISC_FALSE); 4340 } 4341 4342 common: 4343 dns_diff_clear(&temp); 4344 dns_diff_clear(&diff); 4345 4346 if (oldver != NULL) 4347 dns_db_closeversion(db, &oldver, ISC_FALSE); 4348 4349 if (db != NULL) 4350 dns_db_detach(&db); 4351 4352 if (ssutable != NULL) 4353 dns_ssutable_detach(&ssutable); 4354 4355 isc_task_detach(&task); 4356 uev->result = result; 4357 if (zone != NULL) 4358 INSIST(uev->zone == zone); /* we use this later */ 4359 uev->ev_type = DNS_EVENT_UPDATEDONE; 4360 uev->ev_action = updatedone_action; 4361 isc_task_send(client->task, &event); 4362 INSIST(event == NULL); 4363} 4364 4365static void 4366updatedone_action(isc_task_t *task, isc_event_t *event) { 4367 update_event_t *uev = (update_event_t *) event; 4368 ns_client_t *client = (ns_client_t *) event->ev_arg; 4369 4370 UNUSED(task); 4371 4372 INSIST(event->ev_type == DNS_EVENT_UPDATEDONE); 4373 INSIST(task == client->task); 4374 4375 INSIST(client->nupdates > 0); 4376 switch (uev->result) { 4377 case ISC_R_SUCCESS: 4378 inc_stats(uev->zone, dns_nsstatscounter_updatedone); 4379 break; 4380 case DNS_R_REFUSED: 4381 inc_stats(uev->zone, dns_nsstatscounter_updaterej); 4382 break; 4383 default: 4384 inc_stats(uev->zone, dns_nsstatscounter_updatefail); 4385 break; 4386 } 4387 if (uev->zone != NULL) 4388 dns_zone_detach(&uev->zone); 4389 client->nupdates--; 4390 respond(client, uev->result); 4391 isc_event_free(&event); 4392 ns_client_detach(&client); 4393} 4394 4395/*% 4396 * Update forwarding support. 4397 */ 4398 4399static void 4400forward_fail(isc_task_t *task, isc_event_t *event) { 4401 ns_client_t *client = (ns_client_t *)event->ev_arg; 4402 4403 UNUSED(task); 4404 4405 INSIST(client->nupdates > 0); 4406 client->nupdates--; 4407 respond(client, DNS_R_SERVFAIL); 4408 isc_event_free(&event); 4409 ns_client_detach(&client); 4410} 4411 4412 4413static void 4414forward_callback(void *arg, isc_result_t result, dns_message_t *answer) { 4415 update_event_t *uev = arg; 4416 ns_client_t *client = uev->ev_arg; 4417 dns_zone_t *zone = uev->zone; 4418 4419 if (result != ISC_R_SUCCESS) { 4420 INSIST(answer == NULL); 4421 uev->ev_type = DNS_EVENT_UPDATEDONE; 4422 uev->ev_action = forward_fail; 4423 inc_stats(zone, dns_nsstatscounter_updatefwdfail); 4424 } else { 4425 uev->ev_type = DNS_EVENT_UPDATEDONE; 4426 uev->ev_action = forward_done; 4427 uev->answer = answer; 4428 inc_stats(zone, dns_nsstatscounter_updaterespfwd); 4429 } 4430 isc_task_send(client->task, ISC_EVENT_PTR(&uev)); 4431 dns_zone_detach(&zone); 4432} 4433 4434static void 4435forward_done(isc_task_t *task, isc_event_t *event) { 4436 update_event_t *uev = (update_event_t *) event; 4437 ns_client_t *client = (ns_client_t *)event->ev_arg; 4438 4439 UNUSED(task); 4440 4441 INSIST(client->nupdates > 0); 4442 client->nupdates--; 4443 ns_client_sendraw(client, uev->answer); 4444 dns_message_destroy(&uev->answer); 4445 isc_event_free(&event); 4446 ns_client_detach(&client); 4447} 4448 4449static void 4450forward_action(isc_task_t *task, isc_event_t *event) { 4451 update_event_t *uev = (update_event_t *) event; 4452 dns_zone_t *zone = uev->zone; 4453 ns_client_t *client = (ns_client_t *)event->ev_arg; 4454 isc_result_t result; 4455 4456 result = dns_zone_forwardupdate(zone, client->message, 4457 forward_callback, event); 4458 if (result != ISC_R_SUCCESS) { 4459 uev->ev_type = DNS_EVENT_UPDATEDONE; 4460 uev->ev_action = forward_fail; 4461 isc_task_send(client->task, &event); 4462 inc_stats(zone, dns_nsstatscounter_updatefwdfail); 4463 dns_zone_detach(&zone); 4464 } else 4465 inc_stats(zone, dns_nsstatscounter_updatereqfwd); 4466 isc_task_detach(&task); 4467} 4468 4469static isc_result_t 4470send_forward_event(ns_client_t *client, dns_zone_t *zone) { 4471 isc_result_t result = ISC_R_SUCCESS; 4472 update_event_t *event = NULL; 4473 isc_task_t *zonetask = NULL; 4474 ns_client_t *evclient; 4475 4476 event = (update_event_t *) 4477 isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE, 4478 forward_action, NULL, sizeof(*event)); 4479 if (event == NULL) 4480 FAIL(ISC_R_NOMEMORY); 4481 event->zone = zone; 4482 event->result = ISC_R_SUCCESS; 4483 4484 evclient = NULL; 4485 ns_client_attach(client, &evclient); 4486 INSIST(client->nupdates == 0); 4487 client->nupdates++; 4488 event->ev_arg = evclient; 4489 4490 dns_zone_gettask(zone, &zonetask); 4491 isc_task_send(zonetask, ISC_EVENT_PTR(&event)); 4492 4493 failure: 4494 if (event != NULL) 4495 isc_event_free(ISC_EVENT_PTR(&event)); 4496 return (result); 4497} 4498