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Diffstat (limited to '')
| -rw-r--r-- | lib/ns/update.c | 3866 |
1 files changed, 3866 insertions, 0 deletions
diff --git a/lib/ns/update.c b/lib/ns/update.c new file mode 100644 index 0000000..983ca84 --- /dev/null +++ b/lib/ns/update.c @@ -0,0 +1,3866 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +#include <inttypes.h> +#include <stdbool.h> + +#include <isc/netaddr.h> +#include <isc/print.h> +#include <isc/serial.h> +#include <isc/stats.h> +#include <isc/string.h> +#include <isc/taskpool.h> +#include <isc/util.h> + +#include <dns/db.h> +#include <dns/dbiterator.h> +#include <dns/diff.h> +#include <dns/dnssec.h> +#include <dns/events.h> +#include <dns/fixedname.h> +#include <dns/journal.h> +#include <dns/keyvalues.h> +#include <dns/message.h> +#include <dns/nsec.h> +#include <dns/nsec3.h> +#include <dns/private.h> +#include <dns/rdataclass.h> +#include <dns/rdataset.h> +#include <dns/rdatasetiter.h> +#include <dns/rdatastruct.h> +#include <dns/rdatatype.h> +#include <dns/result.h> +#include <dns/soa.h> +#include <dns/ssu.h> +#include <dns/tsig.h> +#include <dns/update.h> +#include <dns/view.h> +#include <dns/zone.h> +#include <dns/zt.h> + +#include <ns/client.h> +#include <ns/interfacemgr.h> +#include <ns/log.h> +#include <ns/server.h> +#include <ns/stats.h> +#include <ns/update.h> + +/*! \file + * \brief + * This module implements dynamic update as in RFC2136. + */ + +/* + * XXX TODO: + * - document strict minimality + */ + +/**************************************************************************/ + +/*% + * Log level for tracing dynamic update protocol requests. + */ +#define LOGLEVEL_PROTOCOL ISC_LOG_INFO + +/*% + * Log level for low-level debug tracing. + */ +#define LOGLEVEL_DEBUG ISC_LOG_DEBUG(8) + +/*% + * Check an operation for failure. These macros all assume that + * the function using them has a 'result' variable and a 'failure' + * label. + */ +#define CHECK(op) \ + do { \ + result = (op); \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) + +/*% + * Fail unconditionally with result 'code', which must not + * be ISC_R_SUCCESS. The reason for failure presumably has + * been logged already. + * + * The test against ISC_R_SUCCESS is there to keep the Solaris compiler + * from complaining about "end-of-loop code not reached". + */ + +#define FAIL(code) \ + do { \ + result = (code); \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) + +/*% + * Fail unconditionally and log as a client error. + * The test against ISC_R_SUCCESS is there to keep the Solaris compiler + * from complaining about "end-of-loop code not reached". + */ +#define FAILC(code, msg) \ + do { \ + const char *_what = "failed"; \ + result = (code); \ + switch (result) { \ + case DNS_R_NXDOMAIN: \ + case DNS_R_YXDOMAIN: \ + case DNS_R_YXRRSET: \ + case DNS_R_NXRRSET: \ + _what = "unsuccessful"; \ + default: \ + break; \ + } \ + update_log(client, zone, LOGLEVEL_PROTOCOL, \ + "update %s: %s (%s)", _what, msg, \ + isc_result_totext(result)); \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) +#define PREREQFAILC(code, msg) \ + do { \ + inc_stats(client, zone, ns_statscounter_updatebadprereq); \ + FAILC(code, msg); \ + } while (0) + +#define FAILN(code, name, msg) \ + do { \ + const char *_what = "failed"; \ + result = (code); \ + switch (result) { \ + case DNS_R_NXDOMAIN: \ + case DNS_R_YXDOMAIN: \ + case DNS_R_YXRRSET: \ + case DNS_R_NXRRSET: \ + _what = "unsuccessful"; \ + default: \ + break; \ + } \ + if (isc_log_wouldlog(ns_lctx, LOGLEVEL_PROTOCOL)) { \ + char _nbuf[DNS_NAME_FORMATSIZE]; \ + dns_name_format(name, _nbuf, sizeof(_nbuf)); \ + update_log(client, zone, LOGLEVEL_PROTOCOL, \ + "update %s: %s: %s (%s)", _what, _nbuf, \ + msg, isc_result_totext(result)); \ + } \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) +#define PREREQFAILN(code, name, msg) \ + do { \ + inc_stats(client, zone, ns_statscounter_updatebadprereq); \ + FAILN(code, name, msg); \ + } while (0) + +#define FAILNT(code, name, type, msg) \ + do { \ + const char *_what = "failed"; \ + result = (code); \ + switch (result) { \ + case DNS_R_NXDOMAIN: \ + case DNS_R_YXDOMAIN: \ + case DNS_R_YXRRSET: \ + case DNS_R_NXRRSET: \ + _what = "unsuccessful"; \ + default: \ + break; \ + } \ + if (isc_log_wouldlog(ns_lctx, LOGLEVEL_PROTOCOL)) { \ + char _nbuf[DNS_NAME_FORMATSIZE]; \ + char _tbuf[DNS_RDATATYPE_FORMATSIZE]; \ + dns_name_format(name, _nbuf, sizeof(_nbuf)); \ + dns_rdatatype_format(type, _tbuf, sizeof(_tbuf)); \ + update_log(client, zone, LOGLEVEL_PROTOCOL, \ + "update %s: %s/%s: %s (%s)", _what, _nbuf, \ + _tbuf, msg, isc_result_totext(result)); \ + } \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) +#define PREREQFAILNT(code, name, type, msg) \ + do { \ + inc_stats(client, zone, ns_statscounter_updatebadprereq); \ + FAILNT(code, name, type, msg); \ + } while (0) + +/*% + * Fail unconditionally and log as a server error. + * The test against ISC_R_SUCCESS is there to keep the Solaris compiler + * from complaining about "end-of-loop code not reached". + */ +#define FAILS(code, msg) \ + do { \ + result = (code); \ + update_log(client, zone, LOGLEVEL_PROTOCOL, "error: %s: %s", \ + msg, isc_result_totext(result)); \ + if (result != ISC_R_SUCCESS) \ + goto failure; \ + } while (0) + +/* + * Return TRUE if NS_CLIENTATTR_TCP is set in the attributes other FALSE. + */ +#define TCPCLIENT(client) (((client)->attributes & NS_CLIENTATTR_TCP) != 0) + +/**************************************************************************/ + +typedef struct rr rr_t; + +struct rr { + /* dns_name_t name; */ + uint32_t ttl; + dns_rdata_t rdata; +}; + +typedef struct update_event update_event_t; + +struct update_event { + ISC_EVENT_COMMON(update_event_t); + dns_zone_t *zone; + isc_result_t result; + dns_message_t *answer; + const dns_ssurule_t **rules; + size_t ruleslen; +}; + +/*% + * Prepare an RR for the addition of the new RR 'ctx->update_rr', + * with TTL 'ctx->update_rr_ttl', to its rdataset, by deleting + * the RRs if it is replaced by the new RR or has a conflicting TTL. + * The necessary changes are appended to ctx->del_diff and ctx->add_diff; + * we need to do all deletions before any additions so that we don't run + * into transient states with conflicting TTLs. + */ + +typedef struct { + dns_db_t *db; + dns_dbversion_t *ver; + dns_diff_t *diff; + dns_name_t *name; + dns_name_t *oldname; + dns_rdata_t *update_rr; + dns_ttl_t update_rr_ttl; + bool ignore_add; + dns_diff_t del_diff; + dns_diff_t add_diff; +} add_rr_prepare_ctx_t; + +/**************************************************************************/ +/* + * Forward declarations. + */ + +static void +update_action(isc_task_t *task, isc_event_t *event); +static void +updatedone_action(isc_task_t *task, isc_event_t *event); +static isc_result_t +send_forward_event(ns_client_t *client, dns_zone_t *zone); +static void +forward_done(isc_task_t *task, isc_event_t *event); +static isc_result_t +add_rr_prepare_action(void *data, rr_t *rr); +static isc_result_t +rr_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + const dns_rdata_t *rdata, bool *flag); + +/**************************************************************************/ + +static void +update_log(ns_client_t *client, dns_zone_t *zone, int level, const char *fmt, + ...) ISC_FORMAT_PRINTF(4, 5); + +static void +update_log(ns_client_t *client, dns_zone_t *zone, int level, const char *fmt, + ...) { + va_list ap; + char message[4096]; + char namebuf[DNS_NAME_FORMATSIZE]; + char classbuf[DNS_RDATACLASS_FORMATSIZE]; + + if (client == NULL) { + return; + } + + if (!isc_log_wouldlog(ns_lctx, level)) { + return; + } + + va_start(ap, fmt); + vsnprintf(message, sizeof(message), fmt, ap); + va_end(ap); + + if (zone != NULL) { + dns_name_format(dns_zone_getorigin(zone), namebuf, + sizeof(namebuf)); + dns_rdataclass_format(dns_zone_getclass(zone), classbuf, + sizeof(classbuf)); + + ns_client_log(client, NS_LOGCATEGORY_UPDATE, + NS_LOGMODULE_UPDATE, level, + "updating zone '%s/%s': %s", namebuf, classbuf, + message); + } else { + ns_client_log(client, NS_LOGCATEGORY_UPDATE, + NS_LOGMODULE_UPDATE, level, "%s", message); + } +} + +static void +update_log_cb(void *arg, dns_zone_t *zone, int level, const char *message) { + update_log(arg, zone, level, "%s", message); +} + +/*% + * Increment updated-related statistics counters. + */ +static void +inc_stats(ns_client_t *client, dns_zone_t *zone, isc_statscounter_t counter) { + ns_stats_increment(client->sctx->nsstats, counter); + + if (zone != NULL) { + isc_stats_t *zonestats = dns_zone_getrequeststats(zone); + if (zonestats != NULL) { + isc_stats_increment(zonestats, counter); + } + } +} + +/*% + * Check if we could have queried for the contents of this zone or + * if the zone is potentially updateable. + * If the zone can potentially be updated and the check failed then + * log a error otherwise we log a informational message. + */ +static isc_result_t +checkqueryacl(ns_client_t *client, dns_acl_t *queryacl, dns_name_t *zonename, + dns_acl_t *updateacl, dns_ssutable_t *ssutable) { + isc_result_t result; + char namebuf[DNS_NAME_FORMATSIZE]; + char classbuf[DNS_RDATACLASS_FORMATSIZE]; + bool update_possible = + ((updateacl != NULL && !dns_acl_isnone(updateacl)) || + ssutable != NULL); + + result = ns_client_checkaclsilent(client, NULL, queryacl, true); + if (result != ISC_R_SUCCESS) { + int level = update_possible ? ISC_LOG_ERROR : ISC_LOG_INFO; + + dns_name_format(zonename, namebuf, sizeof(namebuf)); + dns_rdataclass_format(client->view->rdclass, classbuf, + sizeof(classbuf)); + + ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, + NS_LOGMODULE_UPDATE, level, + "update '%s/%s' denied due to allow-query", + namebuf, classbuf); + } else if (!update_possible) { + dns_name_format(zonename, namebuf, sizeof(namebuf)); + dns_rdataclass_format(client->view->rdclass, classbuf, + sizeof(classbuf)); + + result = DNS_R_REFUSED; + ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, + NS_LOGMODULE_UPDATE, ISC_LOG_INFO, + "update '%s/%s' denied", namebuf, classbuf); + } + return (result); +} + +/*% + * Override the default acl logging when checking whether a client + * can update the zone or whether we can forward the request to the + * primary server based on IP address. + * + * 'message' contains the type of operation that is being attempted. + * + * 'secondary' indicates whether this is a secondary zone. + * + * If the zone has no access controls configured ('acl' == NULL && + * 'has_ssutable == false`), log the attempt at info, otherwise at error. + * If 'secondary' is true, log at debug=3. + * + * If the request was signed, log that we received it. + */ +static isc_result_t +checkupdateacl(ns_client_t *client, dns_acl_t *acl, const char *message, + dns_name_t *zonename, bool secondary, bool has_ssutable) { + char namebuf[DNS_NAME_FORMATSIZE]; + char classbuf[DNS_RDATACLASS_FORMATSIZE]; + int level = ISC_LOG_ERROR; + const char *msg = "denied"; + isc_result_t result; + + if (secondary && acl == NULL) { + result = DNS_R_NOTIMP; + level = ISC_LOG_DEBUG(3); + msg = "disabled"; + } else { + result = ns_client_checkaclsilent(client, NULL, acl, false); + if (result == ISC_R_SUCCESS) { + level = ISC_LOG_DEBUG(3); + msg = "approved"; + } else if (acl == NULL && !has_ssutable) { + level = ISC_LOG_INFO; + } + } + + if (client->signer != NULL) { + dns_name_format(client->signer, namebuf, sizeof(namebuf)); + ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, + NS_LOGMODULE_UPDATE, ISC_LOG_INFO, + "signer \"%s\" %s", namebuf, msg); + } + + dns_name_format(zonename, namebuf, sizeof(namebuf)); + dns_rdataclass_format(client->view->rdclass, classbuf, + sizeof(classbuf)); + + ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY, + NS_LOGMODULE_UPDATE, level, "%s '%s/%s' %s", message, + namebuf, classbuf, msg); + return (result); +} + +/*% + * Update a single RR in version 'ver' of 'db' and log the + * update in 'diff'. + * + * Ensures: + * \li '*tuple' == NULL. Either the tuple is freed, or its + * ownership has been transferred to the diff. + */ +static isc_result_t +do_one_tuple(dns_difftuple_t **tuple, dns_db_t *db, dns_dbversion_t *ver, + dns_diff_t *diff) { + dns_diff_t temp_diff; + isc_result_t result; + + /* + * Create a singleton diff. + */ + dns_diff_init(diff->mctx, &temp_diff); + ISC_LIST_APPEND(temp_diff.tuples, *tuple, link); + + /* + * Apply it to the database. + */ + result = dns_diff_apply(&temp_diff, db, ver); + ISC_LIST_UNLINK(temp_diff.tuples, *tuple, link); + if (result != ISC_R_SUCCESS) { + dns_difftuple_free(tuple); + return (result); + } + + /* + * Merge it into the current pending journal entry. + */ + dns_diff_appendminimal(diff, tuple); + + /* + * Do not clear temp_diff. + */ + return (ISC_R_SUCCESS); +} + +/*% + * Perform the updates in 'updates' in version 'ver' of 'db' and log the + * update in 'diff'. + * + * Ensures: + * \li 'updates' is empty. + */ +static isc_result_t +do_diff(dns_diff_t *updates, dns_db_t *db, dns_dbversion_t *ver, + dns_diff_t *diff) { + isc_result_t result; + while (!ISC_LIST_EMPTY(updates->tuples)) { + dns_difftuple_t *t = ISC_LIST_HEAD(updates->tuples); + ISC_LIST_UNLINK(updates->tuples, t, link); + CHECK(do_one_tuple(&t, db, ver, diff)); + } + return (ISC_R_SUCCESS); + +failure: + dns_diff_clear(diff); + return (result); +} + +static isc_result_t +update_one_rr(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff, + dns_diffop_t op, dns_name_t *name, dns_ttl_t ttl, + dns_rdata_t *rdata) { + dns_difftuple_t *tuple = NULL; + isc_result_t result; + result = dns_difftuple_create(diff->mctx, op, name, ttl, rdata, &tuple); + if (result != ISC_R_SUCCESS) { + return (result); + } + return (do_one_tuple(&tuple, db, ver, diff)); +} + +/**************************************************************************/ +/* + * Callback-style iteration over rdatasets and rdatas. + * + * foreach_rrset() can be used to iterate over the RRsets + * of a name and call a callback function with each + * one. Similarly, foreach_rr() can be used to iterate + * over the individual RRs at name, optionally restricted + * to RRs of a given type. + * + * The callback functions are called "actions" and take + * two arguments: a void pointer for passing arbitrary + * context information, and a pointer to the current RRset + * or RR. By convention, their names end in "_action". + */ + +/* + * XXXRTH We might want to make this public somewhere in libdns. + */ + +/*% + * Function type for foreach_rrset() iterator actions. + */ +typedef isc_result_t +rrset_func(void *data, dns_rdataset_t *rrset); + +/*% + * Function type for foreach_rr() iterator actions. + */ +typedef isc_result_t +rr_func(void *data, rr_t *rr); + +/*% + * Internal context struct for foreach_node_rr(). + */ +typedef struct { + rr_func *rr_action; + void *rr_action_data; +} foreach_node_rr_ctx_t; + +/*% + * Internal helper function for foreach_node_rr(). + */ +static isc_result_t +foreach_node_rr_action(void *data, dns_rdataset_t *rdataset) { + isc_result_t result; + foreach_node_rr_ctx_t *ctx = data; + for (result = dns_rdataset_first(rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(rdataset)) + { + rr_t rr = { 0, DNS_RDATA_INIT }; + + dns_rdataset_current(rdataset, &rr.rdata); + rr.ttl = rdataset->ttl; + result = (*ctx->rr_action)(ctx->rr_action_data, &rr); + if (result != ISC_R_SUCCESS) { + return (result); + } + } + if (result != ISC_R_NOMORE) { + return (result); + } + return (ISC_R_SUCCESS); +} + +/*% + * For each rdataset of 'name' in 'ver' of 'db', call 'action' + * with the rdataset and 'action_data' as arguments. If the name + * does not exist, do nothing. + * + * If 'action' returns an error, abort iteration and return the error. + */ +static isc_result_t +foreach_rrset(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + rrset_func *action, void *action_data) { + isc_result_t result; + dns_dbnode_t *node; + dns_rdatasetiter_t *iter; + dns_clientinfomethods_t cm; + dns_clientinfo_t ci; + dns_dbversion_t *oldver = NULL; + + dns_clientinfomethods_init(&cm, ns_client_sourceip); + + /* + * Only set the clientinfo 'versionp' if the new version is + * different from the current version + */ + dns_db_currentversion(db, &oldver); + dns_clientinfo_init(&ci, NULL, (ver != oldver) ? ver : NULL); + dns_db_closeversion(db, &oldver, false); + + node = NULL; + result = dns_db_findnodeext(db, name, false, &cm, &ci, &node); + if (result == ISC_R_NOTFOUND) { + return (ISC_R_SUCCESS); + } + if (result != ISC_R_SUCCESS) { + return (result); + } + + iter = NULL; + result = dns_db_allrdatasets(db, node, ver, 0, (isc_stdtime_t)0, &iter); + if (result != ISC_R_SUCCESS) { + goto cleanup_node; + } + + for (result = dns_rdatasetiter_first(iter); result == ISC_R_SUCCESS; + result = dns_rdatasetiter_next(iter)) + { + dns_rdataset_t rdataset; + + dns_rdataset_init(&rdataset); + dns_rdatasetiter_current(iter, &rdataset); + + result = (*action)(action_data, &rdataset); + + dns_rdataset_disassociate(&rdataset); + if (result != ISC_R_SUCCESS) { + goto cleanup_iterator; + } + } + if (result == ISC_R_NOMORE) { + result = ISC_R_SUCCESS; + } + +cleanup_iterator: + dns_rdatasetiter_destroy(&iter); + +cleanup_node: + dns_db_detachnode(db, &node); + + return (result); +} + +/*% + * For each RR of 'name' in 'ver' of 'db', call 'action' + * with the RR and 'action_data' as arguments. If the name + * does not exist, do nothing. + * + * If 'action' returns an error, abort iteration + * and return the error. + */ +static isc_result_t +foreach_node_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + rr_func *rr_action, void *rr_action_data) { + foreach_node_rr_ctx_t ctx; + ctx.rr_action = rr_action; + ctx.rr_action_data = rr_action_data; + return (foreach_rrset(db, ver, name, foreach_node_rr_action, &ctx)); +} + +/*% + * For each of the RRs specified by 'db', 'ver', 'name', 'type', + * (which can be dns_rdatatype_any to match any type), and 'covers', call + * 'action' with the RR and 'action_data' as arguments. If the name + * does not exist, or if no RRset of the given type exists at the name, + * do nothing. + * + * If 'action' returns an error, abort iteration and return the error. + */ +static isc_result_t +foreach_rr(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + dns_rdatatype_t type, dns_rdatatype_t covers, rr_func *rr_action, + void *rr_action_data) { + isc_result_t result; + dns_dbnode_t *node; + dns_rdataset_t rdataset; + dns_clientinfomethods_t cm; + dns_clientinfo_t ci; + dns_dbversion_t *oldver = NULL; + dns_fixedname_t fixed; + + dns_clientinfomethods_init(&cm, ns_client_sourceip); + + /* + * Only set the clientinfo 'versionp' if the new version is + * different from the current version + */ + dns_db_currentversion(db, &oldver); + dns_clientinfo_init(&ci, NULL, (ver != oldver) ? ver : NULL); + dns_db_closeversion(db, &oldver, false); + + if (type == dns_rdatatype_any) { + return (foreach_node_rr(db, ver, name, rr_action, + rr_action_data)); + } + + node = NULL; + if (type == dns_rdatatype_nsec3 || + (type == dns_rdatatype_rrsig && covers == dns_rdatatype_nsec3)) + { + result = dns_db_findnsec3node(db, name, false, &node); + } else { + result = dns_db_findnodeext(db, name, false, &cm, &ci, &node); + } + if (result == ISC_R_NOTFOUND) { + return (ISC_R_SUCCESS); + } + if (result != ISC_R_SUCCESS) { + return (result); + } + + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, ver, type, covers, + (isc_stdtime_t)0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) { + result = ISC_R_SUCCESS; + goto cleanup_node; + } + if (result != ISC_R_SUCCESS) { + goto cleanup_node; + } + + if (rr_action == add_rr_prepare_action) { + add_rr_prepare_ctx_t *ctx = rr_action_data; + + ctx->oldname = dns_fixedname_initname(&fixed); + dns_name_copy(name, ctx->oldname); + dns_rdataset_getownercase(&rdataset, ctx->oldname); + } + + for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + rr_t rr = { 0, DNS_RDATA_INIT }; + dns_rdataset_current(&rdataset, &rr.rdata); + rr.ttl = rdataset.ttl; + result = (*rr_action)(rr_action_data, &rr); + if (result != ISC_R_SUCCESS) { + goto cleanup_rdataset; + } + } + if (result != ISC_R_NOMORE) { + goto cleanup_rdataset; + } + result = ISC_R_SUCCESS; + +cleanup_rdataset: + dns_rdataset_disassociate(&rdataset); +cleanup_node: + dns_db_detachnode(db, &node); + + return (result); +} + +/**************************************************************************/ +/* + * Various tests on the database contents (for prerequisites, etc). + */ + +/*% + * Function type for predicate functions that compare a database RR 'db_rr' + * against an update RR 'update_rr'. + */ +typedef bool +rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr); + +static isc_result_t +count_action(void *data, rr_t *rr) { + unsigned int *ui = (unsigned int *)data; + + UNUSED(rr); + + (*ui)++; + + return (ISC_R_SUCCESS); +} + +/*% + * Helper function for rrset_exists(). + */ +static isc_result_t +rrset_exists_action(void *data, rr_t *rr) { + UNUSED(data); + UNUSED(rr); + return (ISC_R_EXISTS); +} + +/*% + * Utility macro for RR existence checking functions. + * + * If the variable 'result' has the value ISC_R_EXISTS or + * ISC_R_SUCCESS, set *exists to true or false, + * respectively, and return success. + * + * If 'result' has any other value, there was a failure. + * Return the failure result code and do not set *exists. + * + * This would be more readable as "do { if ... } while(0)", + * but that form generates tons of warnings on Solaris 2.6. + */ +#define RETURN_EXISTENCE_FLAG \ + return ((result == ISC_R_EXISTS) \ + ? (*exists = true, ISC_R_SUCCESS) \ + : ((result == ISC_R_SUCCESS) \ + ? (*exists = false, ISC_R_SUCCESS) \ + : result)) + +/*% + * Set '*exists' to true iff an rrset of the given type exists, + * to false otherwise. + */ +static isc_result_t +rrset_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + dns_rdatatype_t type, dns_rdatatype_t covers, bool *exists) { + isc_result_t result; + result = foreach_rr(db, ver, name, type, covers, rrset_exists_action, + NULL); + RETURN_EXISTENCE_FLAG; +} + +/*% + * Helper function for cname_incompatible_rrset_exists. + */ +static isc_result_t +cname_compatibility_action(void *data, dns_rdataset_t *rrset) { + UNUSED(data); + if (rrset->type != dns_rdatatype_cname && + !dns_rdatatype_atcname(rrset->type)) + { + return (ISC_R_EXISTS); + } + return (ISC_R_SUCCESS); +} + +/*% + * Check whether there is an rrset incompatible with adding a CNAME RR, + * i.e., anything but another CNAME (which can be replaced) or a + * DNSSEC RR (which can coexist). + * + * If such an incompatible rrset exists, set '*exists' to true. + * Otherwise, set it to false. + */ +static isc_result_t +cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver, + dns_name_t *name, bool *exists) { + isc_result_t result; + result = foreach_rrset(db, ver, name, cname_compatibility_action, NULL); + RETURN_EXISTENCE_FLAG; +} + +/*% + * Helper function for rr_count(). + */ +static isc_result_t +count_rr_action(void *data, rr_t *rr) { + int *countp = data; + UNUSED(rr); + (*countp)++; + return (ISC_R_SUCCESS); +} + +/*% + * Count the number of RRs of 'type' belonging to 'name' in 'ver' of 'db'. + */ +static isc_result_t +rr_count(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + dns_rdatatype_t type, dns_rdatatype_t covers, int *countp) { + *countp = 0; + return (foreach_rr(db, ver, name, type, covers, count_rr_action, + countp)); +} + +/*% + * Context struct and helper function for name_exists(). + */ + +static isc_result_t +name_exists_action(void *data, dns_rdataset_t *rrset) { + UNUSED(data); + UNUSED(rrset); + return (ISC_R_EXISTS); +} + +/*% + * Set '*exists' to true iff the given name exists, to false otherwise. + */ +static isc_result_t +name_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + bool *exists) { + isc_result_t result; + result = foreach_rrset(db, ver, name, name_exists_action, NULL); + RETURN_EXISTENCE_FLAG; +} + +/* + * 'ssu_check_t' is used to pass the arguments to + * dns_ssutable_checkrules() to the callback function + * ssu_checkrule(). + */ +typedef struct { + /* The ownername of the record to be updated. */ + dns_name_t *name; + + /* The signature's name if the request was signed. */ + dns_name_t *signer; + + /* The address of the client. */ + isc_netaddr_t *addr; + + /* The ACL environment */ + dns_aclenv_t *aclenv; + + /* Whether the request was sent via TCP. */ + bool tcp; + + /* The ssu table to check against. */ + dns_ssutable_t *table; + + /* the key used for TKEY requests */ + dst_key_t *key; +} ssu_check_t; + +static isc_result_t +ssu_checkrule(void *data, dns_rdataset_t *rrset) { + ssu_check_t *ssuinfo = data; + bool rule_ok = false; + + /* + * If we're deleting all records, it's ok to delete RRSIG and NSEC even + * if we're normally not allowed to. + */ + if (rrset->type == dns_rdatatype_rrsig || + rrset->type == dns_rdatatype_nsec) + { + return (ISC_R_SUCCESS); + } + + /* + * krb5-subdomain-self-rhs and ms-subdomain-self-rhs need + * to check the PTR and SRV target names so extract them + * from the resource records. + */ + if (rrset->rdclass == dns_rdataclass_in && + (rrset->type == dns_rdatatype_srv || + rrset->type == dns_rdatatype_ptr)) + { + dns_name_t *target = NULL; + dns_rdata_ptr_t ptr; + dns_rdata_in_srv_t srv; + dns_rdataset_t rdataset; + isc_result_t result; + + dns_rdataset_init(&rdataset); + dns_rdataset_clone(rrset, &rdataset); + + for (result = dns_rdataset_first(&rdataset); + result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdataset_current(&rdataset, &rdata); + if (rrset->type == dns_rdatatype_ptr) { + result = dns_rdata_tostruct(&rdata, &ptr, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &ptr.ptr; + } + if (rrset->type == dns_rdatatype_srv) { + result = dns_rdata_tostruct(&rdata, &srv, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &srv.target; + } + rule_ok = dns_ssutable_checkrules( + ssuinfo->table, ssuinfo->signer, ssuinfo->name, + ssuinfo->addr, ssuinfo->tcp, ssuinfo->aclenv, + rrset->type, target, ssuinfo->key, NULL); + if (!rule_ok) { + break; + } + } + if (result != ISC_R_NOMORE) { + rule_ok = false; + } + dns_rdataset_disassociate(&rdataset); + } else { + rule_ok = dns_ssutable_checkrules( + ssuinfo->table, ssuinfo->signer, ssuinfo->name, + ssuinfo->addr, ssuinfo->tcp, ssuinfo->aclenv, + rrset->type, NULL, ssuinfo->key, NULL); + } + return (rule_ok ? ISC_R_SUCCESS : ISC_R_FAILURE); +} + +static bool +ssu_checkall(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + dns_ssutable_t *ssutable, dns_name_t *signer, isc_netaddr_t *addr, + dns_aclenv_t *aclenv, bool tcp, dst_key_t *key) { + isc_result_t result; + ssu_check_t ssuinfo; + + ssuinfo.name = name; + ssuinfo.table = ssutable; + ssuinfo.signer = signer; + ssuinfo.addr = addr; + ssuinfo.aclenv = aclenv; + ssuinfo.tcp = tcp; + ssuinfo.key = key; + result = foreach_rrset(db, ver, name, ssu_checkrule, &ssuinfo); + return (result == ISC_R_SUCCESS); +} + +static isc_result_t +ssu_checkrr(void *data, rr_t *rr) { + isc_result_t result; + ssu_check_t *ssuinfo = data; + dns_name_t *target = NULL; + dns_rdata_ptr_t ptr; + dns_rdata_in_srv_t srv; + bool answer; + + if (rr->rdata.type == dns_rdatatype_ptr) { + result = dns_rdata_tostruct(&rr->rdata, &ptr, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &ptr.ptr; + } + if (rr->rdata.type == dns_rdatatype_srv) { + result = dns_rdata_tostruct(&rr->rdata, &srv, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &srv.target; + } + + answer = dns_ssutable_checkrules( + ssuinfo->table, ssuinfo->signer, ssuinfo->name, ssuinfo->addr, + ssuinfo->tcp, ssuinfo->aclenv, rr->rdata.type, target, + ssuinfo->key, NULL); + return (answer ? ISC_R_SUCCESS : ISC_R_FAILURE); +} + +/**************************************************************************/ +/* + * Checking of "RRset exists (value dependent)" prerequisites. + * + * In the RFC2136 section 3.2.5, this is the pseudocode involving + * a variable called "temp", a mapping of <name, type> tuples to rrsets. + * + * Here, we represent the "temp" data structure as (non-minimal) "dns_diff_t" + * where each tuple has op==DNS_DIFFOP_EXISTS. + */ + +/*% + * Append a tuple asserting the existence of the RR with + * 'name' and 'rdata' to 'diff'. + */ +static isc_result_t +temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata) { + isc_result_t result; + dns_difftuple_t *tuple = NULL; + + REQUIRE(DNS_DIFF_VALID(diff)); + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS, name, 0, + rdata, &tuple)); + ISC_LIST_APPEND(diff->tuples, tuple, link); +failure: + return (result); +} + +/*% + * Compare two rdatasets represented as sorted lists of tuples. + * All list elements must have the same owner name and type. + * Return ISC_R_SUCCESS if the rdatasets are equal, rcode(dns_rcode_nxrrset) + * if not. + */ +static isc_result_t +temp_check_rrset(dns_difftuple_t *a, dns_difftuple_t *b) { + for (;;) { + if (a == NULL || b == NULL) { + break; + } + INSIST(a->op == DNS_DIFFOP_EXISTS && + b->op == DNS_DIFFOP_EXISTS); + INSIST(a->rdata.type == b->rdata.type); + INSIST(dns_name_equal(&a->name, &b->name)); + if (dns_rdata_casecompare(&a->rdata, &b->rdata) != 0) { + return (DNS_R_NXRRSET); + } + a = ISC_LIST_NEXT(a, link); + b = ISC_LIST_NEXT(b, link); + } + if (a != NULL || b != NULL) { + return (DNS_R_NXRRSET); + } + return (ISC_R_SUCCESS); +} + +/*% + * A comparison function defining the sorting order for the entries + * in the "temp" data structure. The major sort key is the owner name, + * followed by the type and rdata. + */ +static int +temp_order(const void *av, const void *bv) { + dns_difftuple_t const *const *ap = av; + dns_difftuple_t const *const *bp = bv; + dns_difftuple_t const *a = *ap; + dns_difftuple_t const *b = *bp; + int r; + r = dns_name_compare(&a->name, &b->name); + if (r != 0) { + return (r); + } + r = (b->rdata.type - a->rdata.type); + if (r != 0) { + return (r); + } + r = dns_rdata_casecompare(&a->rdata, &b->rdata); + return (r); +} + +/*% + * Check the "RRset exists (value dependent)" prerequisite information + * in 'temp' against the contents of the database 'db'. + * + * Return ISC_R_SUCCESS if the prerequisites are satisfied, + * rcode(dns_rcode_nxrrset) if not. + * + * 'temp' must be pre-sorted. + */ + +static isc_result_t +temp_check(isc_mem_t *mctx, dns_diff_t *temp, dns_db_t *db, + dns_dbversion_t *ver, dns_name_t *tmpname, dns_rdatatype_t *typep) { + isc_result_t result; + dns_name_t *name; + dns_dbnode_t *node; + dns_difftuple_t *t; + dns_diff_t trash; + + dns_diff_init(mctx, &trash); + + /* + * For each name and type in the prerequisites, + * construct a sorted rdata list of the corresponding + * database contents, and compare the lists. + */ + t = ISC_LIST_HEAD(temp->tuples); + while (t != NULL) { + name = &t->name; + dns_name_copy(name, tmpname); + *typep = t->rdata.type; + + /* A new unique name begins here. */ + node = NULL; + result = dns_db_findnode(db, name, false, &node); + if (result == ISC_R_NOTFOUND) { + dns_diff_clear(&trash); + return (DNS_R_NXRRSET); + } + if (result != ISC_R_SUCCESS) { + dns_diff_clear(&trash); + return (result); + } + + /* A new unique type begins here. */ + while (t != NULL && dns_name_equal(&t->name, name)) { + dns_rdatatype_t type, covers; + dns_rdataset_t rdataset; + dns_diff_t d_rrs; /* Database RRs with + * this name and type */ + dns_diff_t u_rrs; /* Update RRs with + * this name and type */ + + *typep = type = t->rdata.type; + if (type == dns_rdatatype_rrsig || + type == dns_rdatatype_sig) + { + covers = dns_rdata_covers(&t->rdata); + } else if (type == dns_rdatatype_any) { + dns_db_detachnode(db, &node); + dns_diff_clear(&trash); + return (DNS_R_NXRRSET); + } else { + covers = 0; + } + + /* + * Collect all database RRs for this name and type + * onto d_rrs and sort them. + */ + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, ver, type, + covers, (isc_stdtime_t)0, + &rdataset, NULL); + if (result != ISC_R_SUCCESS) { + dns_db_detachnode(db, &node); + dns_diff_clear(&trash); + return (DNS_R_NXRRSET); + } + + dns_diff_init(mctx, &d_rrs); + dns_diff_init(mctx, &u_rrs); + + for (result = dns_rdataset_first(&rdataset); + result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdataset_current(&rdataset, &rdata); + result = temp_append(&d_rrs, name, &rdata); + if (result != ISC_R_SUCCESS) { + goto failure; + } + } + if (result != ISC_R_NOMORE) { + goto failure; + } + result = dns_diff_sort(&d_rrs, temp_order); + if (result != ISC_R_SUCCESS) { + goto failure; + } + + /* + * Collect all update RRs for this name and type + * onto u_rrs. No need to sort them here - + * they are already sorted. + */ + while (t != NULL && dns_name_equal(&t->name, name) && + t->rdata.type == type) + { + dns_difftuple_t *next = ISC_LIST_NEXT(t, link); + ISC_LIST_UNLINK(temp->tuples, t, link); + ISC_LIST_APPEND(u_rrs.tuples, t, link); + t = next; + } + + /* Compare the two sorted lists. */ + result = temp_check_rrset(ISC_LIST_HEAD(u_rrs.tuples), + ISC_LIST_HEAD(d_rrs.tuples)); + if (result != ISC_R_SUCCESS) { + goto failure; + } + + /* + * We are done with the tuples, but we can't free + * them yet because "name" still points into one + * of them. Move them on a temporary list. + */ + ISC_LIST_APPENDLIST(trash.tuples, u_rrs.tuples, link); + ISC_LIST_APPENDLIST(trash.tuples, d_rrs.tuples, link); + dns_rdataset_disassociate(&rdataset); + + continue; + + failure: + dns_diff_clear(&d_rrs); + dns_diff_clear(&u_rrs); + dns_diff_clear(&trash); + dns_rdataset_disassociate(&rdataset); + dns_db_detachnode(db, &node); + return (result); + } + + dns_db_detachnode(db, &node); + } + + dns_diff_clear(&trash); + return (ISC_R_SUCCESS); +} + +/**************************************************************************/ +/* + * Conditional deletion of RRs. + */ + +/*% + * Context structure for delete_if(). + */ + +typedef struct { + rr_predicate *predicate; + dns_db_t *db; + dns_dbversion_t *ver; + dns_diff_t *diff; + dns_name_t *name; + dns_rdata_t *update_rr; +} conditional_delete_ctx_t; + +/*% + * Predicate functions for delete_if(). + */ + +/*% + * Return true iff 'db_rr' is neither a SOA nor an NS RR nor + * an RRSIG nor an NSEC3PARAM nor a NSEC. + */ +static bool +type_not_soa_nor_ns_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { + UNUSED(update_rr); + return ((db_rr->type != dns_rdatatype_soa && + db_rr->type != dns_rdatatype_ns && + db_rr->type != dns_rdatatype_nsec3param && + db_rr->type != dns_rdatatype_rrsig && + db_rr->type != dns_rdatatype_nsec) + ? true + : false); +} + +/*% + * Return true iff 'db_rr' is neither a RRSIG nor a NSEC. + */ +static bool +type_not_dnssec(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { + UNUSED(update_rr); + return ((db_rr->type != dns_rdatatype_rrsig && + db_rr->type != dns_rdatatype_nsec) + ? true + : false); +} + +/*% + * Return true always. + */ +static bool +true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { + UNUSED(update_rr); + UNUSED(db_rr); + return (true); +} + +/*% + * Return true iff the two RRs have identical rdata. + */ +static bool +rr_equal_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { + /* + * XXXRTH This is not a problem, but we should consider creating + * dns_rdata_equal() (that used dns_name_equal()), since it + * would be faster. Not a priority. + */ + return (dns_rdata_casecompare(update_rr, db_rr) == 0 ? true : false); +} + +/*% + * Return true iff 'update_rr' should replace 'db_rr' according + * to the special RFC2136 rules for CNAME, SOA, and WKS records. + * + * RFC2136 does not mention NSEC or DNAME, but multiple NSECs or DNAMEs + * make little sense, so we replace those, too. + * + * Additionally replace RRSIG that have been generated by the same key + * for the same type. This simplifies refreshing a offline KSK by not + * requiring that the old RRSIG be deleted. It also simplifies key + * rollover by only requiring that the new RRSIG be added. + */ +static bool +replaces_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) { + dns_rdata_rrsig_t updatesig, dbsig; + isc_result_t result; + + if (db_rr->type != update_rr->type) { + return (false); + } + if (db_rr->type == dns_rdatatype_cname) { + return (true); + } + if (db_rr->type == dns_rdatatype_dname) { + return (true); + } + if (db_rr->type == dns_rdatatype_soa) { + return (true); + } + if (db_rr->type == dns_rdatatype_nsec) { + return (true); + } + if (db_rr->type == dns_rdatatype_rrsig) { + /* + * Replace existing RRSIG with the same keyid, + * covered and algorithm. + */ + result = dns_rdata_tostruct(db_rr, &dbsig, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + result = dns_rdata_tostruct(update_rr, &updatesig, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if (dbsig.keyid == updatesig.keyid && + dbsig.covered == updatesig.covered && + dbsig.algorithm == updatesig.algorithm) + { + return (true); + } + } + if (db_rr->type == dns_rdatatype_wks) { + /* + * Compare the address and protocol fields only. These + * form the first five bytes of the RR data. Do a + * raw binary comparison; unpacking the WKS RRs using + * dns_rdata_tostruct() might be cleaner in some ways. + */ + INSIST(db_rr->length >= 5 && update_rr->length >= 5); + return (memcmp(db_rr->data, update_rr->data, 5) == 0 ? true + : false); + } + + if (db_rr->type == dns_rdatatype_nsec3param) { + if (db_rr->length != update_rr->length) { + return (false); + } + INSIST(db_rr->length >= 4 && update_rr->length >= 4); + /* + * Replace NSEC3PARAM records that only differ by the + * flags field. + */ + if (db_rr->data[0] == update_rr->data[0] && + memcmp(db_rr->data + 2, update_rr->data + 2, + update_rr->length - 2) == 0) + { + return (true); + } + } + return (false); +} + +/*% + * Internal helper function for delete_if(). + */ +static isc_result_t +delete_if_action(void *data, rr_t *rr) { + conditional_delete_ctx_t *ctx = data; + if ((*ctx->predicate)(ctx->update_rr, &rr->rdata)) { + isc_result_t result; + result = update_one_rr(ctx->db, ctx->ver, ctx->diff, + DNS_DIFFOP_DEL, ctx->name, rr->ttl, + &rr->rdata); + return (result); + } else { + return (ISC_R_SUCCESS); + } +} + +/*% + * Conditionally delete RRs. Apply 'predicate' to the RRs + * specified by 'db', 'ver', 'name', and 'type' (which can + * be dns_rdatatype_any to match any type). Delete those + * RRs for which the predicate returns true, and log the + * deletions in 'diff'. + */ +static isc_result_t +delete_if(rr_predicate *predicate, dns_db_t *db, dns_dbversion_t *ver, + dns_name_t *name, dns_rdatatype_t type, dns_rdatatype_t covers, + dns_rdata_t *update_rr, dns_diff_t *diff) { + conditional_delete_ctx_t ctx; + ctx.predicate = predicate; + ctx.db = db; + ctx.ver = ver; + ctx.diff = diff; + ctx.name = name; + ctx.update_rr = update_rr; + return (foreach_rr(db, ver, name, type, covers, delete_if_action, + &ctx)); +} + +/**************************************************************************/ + +static isc_result_t +add_rr_prepare_action(void *data, rr_t *rr) { + isc_result_t result = ISC_R_SUCCESS; + add_rr_prepare_ctx_t *ctx = data; + dns_difftuple_t *tuple = NULL; + bool equal, case_equal, ttl_equal; + + /* + * Are the new and old cases equal? + */ + case_equal = dns_name_caseequal(ctx->name, ctx->oldname); + + /* + * Are the ttl's equal? + */ + ttl_equal = rr->ttl == ctx->update_rr_ttl; + + /* + * If the update RR is a "duplicate" of a existing RR, + * the update should be silently ignored. + */ + equal = (dns_rdata_casecompare(&rr->rdata, ctx->update_rr) == 0); + if (equal && case_equal && ttl_equal) { + ctx->ignore_add = true; + return (ISC_R_SUCCESS); + } + + /* + * If this RR is "equal" to the update RR, it should + * be deleted before the update RR is added. + */ + if (replaces_p(ctx->update_rr, &rr->rdata)) { + CHECK(dns_difftuple_create(ctx->del_diff.mctx, DNS_DIFFOP_DEL, + ctx->oldname, rr->ttl, &rr->rdata, + &tuple)); + dns_diff_append(&ctx->del_diff, &tuple); + return (ISC_R_SUCCESS); + } + + /* + * If this RR differs in TTL or case from the update RR, + * its TTL and case must be adjusted. + */ + if (!ttl_equal || !case_equal) { + CHECK(dns_difftuple_create(ctx->del_diff.mctx, DNS_DIFFOP_DEL, + ctx->oldname, rr->ttl, &rr->rdata, + &tuple)); + dns_diff_append(&ctx->del_diff, &tuple); + if (!equal) { + CHECK(dns_difftuple_create( + ctx->add_diff.mctx, DNS_DIFFOP_ADD, ctx->name, + ctx->update_rr_ttl, &rr->rdata, &tuple)); + dns_diff_append(&ctx->add_diff, &tuple); + } + } +failure: + return (result); +} + +/**************************************************************************/ +/* + * Miscellaneous subroutines. + */ + +/*% + * Extract a single update RR from 'section' of dynamic update message + * 'msg', with consistency checking. + * + * Stores the owner name, rdata, and TTL of the update RR at 'name', + * 'rdata', and 'ttl', respectively. + */ +static void +get_current_rr(dns_message_t *msg, dns_section_t section, + dns_rdataclass_t zoneclass, dns_name_t **name, + dns_rdata_t *rdata, dns_rdatatype_t *covers, dns_ttl_t *ttl, + dns_rdataclass_t *update_class) { + dns_rdataset_t *rdataset; + isc_result_t result; + dns_message_currentname(msg, section, name); + rdataset = ISC_LIST_HEAD((*name)->list); + INSIST(rdataset != NULL); + INSIST(ISC_LIST_NEXT(rdataset, link) == NULL); + *covers = rdataset->covers; + *ttl = rdataset->ttl; + result = dns_rdataset_first(rdataset); + INSIST(result == ISC_R_SUCCESS); + dns_rdataset_current(rdataset, rdata); + INSIST(dns_rdataset_next(rdataset) == ISC_R_NOMORE); + *update_class = rdata->rdclass; + rdata->rdclass = zoneclass; +} + +/*% + * Increment the SOA serial number of database 'db', version 'ver'. + * Replace the SOA record in the database, and log the + * change in 'diff'. + */ + +/* + * XXXRTH Failures in this routine will be worth logging, when + * we have a logging system. Failure to find the zonename + * or the SOA rdataset warrant at least an UNEXPECTED_ERROR(). + */ + +static isc_result_t +update_soa_serial(dns_db_t *db, dns_dbversion_t *ver, dns_diff_t *diff, + isc_mem_t *mctx, dns_updatemethod_t method) { + dns_difftuple_t *deltuple = NULL; + dns_difftuple_t *addtuple = NULL; + uint32_t serial; + isc_result_t result; + + CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_DEL, &deltuple)); + CHECK(dns_difftuple_copy(deltuple, &addtuple)); + addtuple->op = DNS_DIFFOP_ADD; + + serial = dns_soa_getserial(&addtuple->rdata); + serial = dns_update_soaserial(serial, method, NULL); + dns_soa_setserial(serial, &addtuple->rdata); + CHECK(do_one_tuple(&deltuple, db, ver, diff)); + CHECK(do_one_tuple(&addtuple, db, ver, diff)); + result = ISC_R_SUCCESS; + +failure: + if (addtuple != NULL) { + dns_difftuple_free(&addtuple); + } + if (deltuple != NULL) { + dns_difftuple_free(&deltuple); + } + return (result); +} + +/*% + * Check that the new SOA record at 'update_rdata' does not + * illegally cause the SOA serial number to decrease or stay + * unchanged relative to the existing SOA in 'db'. + * + * Sets '*ok' to true if the update is legal, false if not. + * + * William King points out that RFC2136 is inconsistent about + * the case where the serial number stays unchanged: + * + * section 3.4.2.2 requires a server to ignore a SOA update request + * if the serial number on the update SOA is less_than_or_equal to + * the zone SOA serial. + * + * section 3.6 requires a server to ignore a SOA update request if + * the serial is less_than the zone SOA serial. + * + * Paul says 3.4.2.2 is correct. + * + */ +static isc_result_t +check_soa_increment(dns_db_t *db, dns_dbversion_t *ver, + dns_rdata_t *update_rdata, bool *ok) { + uint32_t db_serial; + uint32_t update_serial; + isc_result_t result; + + update_serial = dns_soa_getserial(update_rdata); + + result = dns_db_getsoaserial(db, ver, &db_serial); + if (result != ISC_R_SUCCESS) { + return (result); + } + + if (DNS_SERIAL_GE(db_serial, update_serial)) { + *ok = false; + } else { + *ok = true; + } + + return (ISC_R_SUCCESS); +} + +/**************************************************************************/ +/*% + * The actual update code in all its glory. We try to follow + * the RFC2136 pseudocode as closely as possible. + */ + +static isc_result_t +send_update_event(ns_client_t *client, dns_zone_t *zone) { + isc_result_t result = ISC_R_SUCCESS; + update_event_t *event = NULL; + isc_task_t *zonetask = NULL; + dns_ssutable_t *ssutable = NULL; + dns_message_t *request = client->message; + isc_mem_t *mctx = client->manager->mctx; + dns_aclenv_t *env = client->manager->aclenv; + dns_rdataclass_t zoneclass; + dns_rdatatype_t covers; + dns_name_t *zonename = NULL; + const dns_ssurule_t **rules = NULL; + size_t rule = 0, ruleslen = 0; + dns_db_t *db = NULL; + dns_dbversion_t *ver = NULL; + + CHECK(dns_zone_getdb(zone, &db)); + zonename = dns_db_origin(db); + zoneclass = dns_db_class(db); + dns_zone_getssutable(zone, &ssutable); + dns_db_currentversion(db, &ver); + + /* + * Update message processing can leak record existence information + * so check that we are allowed to query this zone. Additionally, + * if we would refuse all updates for this zone, we bail out here. + */ + CHECK(checkqueryacl(client, dns_zone_getqueryacl(zone), + dns_zone_getorigin(zone), + dns_zone_getupdateacl(zone), ssutable)); + + /* + * Check requestor's permissions. + */ + if (ssutable == NULL) { + CHECK(checkupdateacl(client, dns_zone_getupdateacl(zone), + "update", dns_zone_getorigin(zone), false, + false)); + } else if (client->signer == NULL && !TCPCLIENT(client)) { + CHECK(checkupdateacl(client, NULL, "update", + dns_zone_getorigin(zone), false, true)); + } + + if (dns_zone_getupdatedisabled(zone)) { + FAILC(DNS_R_REFUSED, "dynamic update temporarily disabled " + "because the zone is frozen. Use " + "'rndc thaw' to re-enable updates."); + } + + /* + * Prescan the update section, checking for updates that + * are illegal or violate policy. + */ + if (ssutable != NULL) { + ruleslen = request->counts[DNS_SECTION_UPDATE]; + rules = isc_mem_get(mctx, sizeof(*rules) * ruleslen); + memset(rules, 0, sizeof(*rules) * ruleslen); + } + + for (rule = 0, + result = dns_message_firstname(request, DNS_SECTION_UPDATE); + result == ISC_R_SUCCESS; + rule++, result = dns_message_nextname(request, DNS_SECTION_UPDATE)) + { + dns_name_t *name = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_ttl_t ttl; + dns_rdataclass_t update_class; + + INSIST(ssutable == NULL || rule < ruleslen); + + get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, &name, + &rdata, &covers, &ttl, &update_class); + + if (!dns_name_issubdomain(name, zonename)) { + FAILC(DNS_R_NOTZONE, "update RR is outside zone"); + } + if (update_class == zoneclass) { + /* + * Check for meta-RRs. The RFC2136 pseudocode says + * check for ANY|AXFR|MAILA|MAILB, but the text adds + * "or any other QUERY metatype" + */ + if (dns_rdatatype_ismeta(rdata.type)) { + FAILC(DNS_R_FORMERR, "meta-RR in update"); + } + result = dns_zone_checknames(zone, name, &rdata); + if (result != ISC_R_SUCCESS) { + FAIL(DNS_R_REFUSED); + } + } else if (update_class == dns_rdataclass_any) { + if (ttl != 0 || rdata.length != 0 || + (dns_rdatatype_ismeta(rdata.type) && + rdata.type != dns_rdatatype_any)) + { + FAILC(DNS_R_FORMERR, "meta-RR in update"); + } + } else if (update_class == dns_rdataclass_none) { + if (ttl != 0 || dns_rdatatype_ismeta(rdata.type)) { + FAILC(DNS_R_FORMERR, "meta-RR in update"); + } + } else { + update_log(client, zone, ISC_LOG_WARNING, + "update RR has incorrect class %d", + update_class); + FAIL(DNS_R_FORMERR); + } + + /* + * draft-ietf-dnsind-simple-secure-update-01 says + * "Unlike traditional dynamic update, the client + * is forbidden from updating NSEC records." + */ + if (rdata.type == dns_rdatatype_nsec3) { + FAILC(DNS_R_REFUSED, "explicit NSEC3 updates are not " + "allowed " + "in secure zones"); + } else if (rdata.type == dns_rdatatype_nsec) { + FAILC(DNS_R_REFUSED, "explicit NSEC updates are not " + "allowed " + "in secure zones"); + } else if (rdata.type == dns_rdatatype_rrsig && + !dns_name_equal(name, zonename)) + { + FAILC(DNS_R_REFUSED, "explicit RRSIG updates are " + "currently " + "not supported in secure zones " + "except " + "at the apex"); + } + + if (ssutable != NULL) { + isc_netaddr_t netaddr; + dns_name_t *target = NULL; + dst_key_t *tsigkey = NULL; + dns_rdata_ptr_t ptr; + dns_rdata_in_srv_t srv; + + isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr); + + if (client->message->tsigkey != NULL) { + tsigkey = client->message->tsigkey->key; + } + + if ((update_class == dns_rdataclass_in || + update_class == dns_rdataclass_none) && + rdata.type == dns_rdatatype_ptr) + { + result = dns_rdata_tostruct(&rdata, &ptr, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &ptr.ptr; + } + + if ((update_class == dns_rdataclass_in || + update_class == dns_rdataclass_none) && + rdata.type == dns_rdatatype_srv) + { + result = dns_rdata_tostruct(&rdata, &srv, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + target = &srv.target; + } + + if (update_class == dns_rdataclass_any && + zoneclass == dns_rdataclass_in && + (rdata.type == dns_rdatatype_ptr || + rdata.type == dns_rdatatype_srv)) + { + ssu_check_t ssuinfo; + + ssuinfo.name = name; + ssuinfo.table = ssutable; + ssuinfo.signer = client->signer; + ssuinfo.addr = &netaddr; + ssuinfo.aclenv = env; + ssuinfo.tcp = TCPCLIENT(client); + ssuinfo.key = tsigkey; + + result = foreach_rr(db, ver, name, rdata.type, + dns_rdatatype_none, + ssu_checkrr, &ssuinfo); + if (result != ISC_R_SUCCESS) { + FAILC(DNS_R_REFUSED, + "rejected by secure update"); + } + } else if (target != NULL && + update_class == dns_rdataclass_none) + { + bool flag; + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + if (flag && + !dns_ssutable_checkrules( + ssutable, client->signer, name, + &netaddr, TCPCLIENT(client), env, + rdata.type, target, tsigkey, + &rules[rule])) + { + FAILC(DNS_R_REFUSED, + "rejected by secure update"); + } + } else if (rdata.type != dns_rdatatype_any) { + if (!dns_ssutable_checkrules( + ssutable, client->signer, name, + &netaddr, TCPCLIENT(client), env, + rdata.type, target, tsigkey, + &rules[rule])) + { + FAILC(DNS_R_REFUSED, "rejected by " + "secure update"); + } + } else { + if (!ssu_checkall(db, ver, name, ssutable, + client->signer, &netaddr, env, + TCPCLIENT(client), tsigkey)) + { + FAILC(DNS_R_REFUSED, "rejected by " + "secure update"); + } + } + } + } + if (result != ISC_R_NOMORE) { + FAIL(result); + } + + update_log(client, zone, LOGLEVEL_DEBUG, "update section prescan OK"); + + result = isc_quota_attach(&client->manager->sctx->updquota, + &(isc_quota_t *){ NULL }); + if (result != ISC_R_SUCCESS) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "update failed: too many DNS UPDATEs queued (%s)", + isc_result_totext(result)); + ns_stats_increment(client->manager->sctx->nsstats, + ns_statscounter_updatequota); + CHECK(DNS_R_DROP); + } + + event = (update_event_t *)isc_event_allocate( + client->mctx, client, DNS_EVENT_UPDATE, update_action, NULL, + sizeof(*event)); + event->zone = zone; + event->result = ISC_R_SUCCESS; + event->rules = rules; + event->ruleslen = ruleslen; + rules = NULL; + + INSIST(client->nupdates == 0); + client->nupdates++; + event->ev_arg = client; + + isc_nmhandle_attach(client->handle, &client->updatehandle); + dns_zone_gettask(zone, &zonetask); + isc_task_send(zonetask, ISC_EVENT_PTR(&event)); + +failure: + if (db != NULL) { + dns_db_closeversion(db, &ver, false); + dns_db_detach(&db); + } + + if (rules != NULL) { + isc_mem_put(mctx, rules, sizeof(*rules) * ruleslen); + } + + if (ssutable != NULL) { + dns_ssutable_detach(&ssutable); + } + + return (result); +} + +static void +respond(ns_client_t *client, isc_result_t result) { + isc_result_t msg_result; + + msg_result = dns_message_reply(client->message, true); + if (msg_result != ISC_R_SUCCESS) { + isc_log_write(ns_lctx, NS_LOGCATEGORY_UPDATE, + NS_LOGMODULE_UPDATE, ISC_LOG_ERROR, + "could not create update response message: %s", + isc_result_totext(msg_result)); + ns_client_drop(client, msg_result); + isc_nmhandle_detach(&client->reqhandle); + return; + } + + client->message->rcode = dns_result_torcode(result); + ns_client_send(client); + isc_nmhandle_detach(&client->reqhandle); +} + +void +ns_update_start(ns_client_t *client, isc_nmhandle_t *handle, + isc_result_t sigresult) { + dns_message_t *request = client->message; + isc_result_t result; + dns_name_t *zonename; + dns_rdataset_t *zone_rdataset; + dns_zone_t *zone = NULL, *raw = NULL; + + /* + * Attach to the request handle. This will be held until + * we respond, or drop the request. + */ + isc_nmhandle_attach(handle, &client->reqhandle); + + /* + * Interpret the zone section. + */ + result = dns_message_firstname(request, DNS_SECTION_ZONE); + if (result != ISC_R_SUCCESS) { + FAILC(DNS_R_FORMERR, "update zone section empty"); + } + + /* + * The zone section must contain exactly one "question", and + * it must be of type SOA. + */ + zonename = NULL; + dns_message_currentname(request, DNS_SECTION_ZONE, &zonename); + zone_rdataset = ISC_LIST_HEAD(zonename->list); + if (zone_rdataset->type != dns_rdatatype_soa) { + FAILC(DNS_R_FORMERR, "update zone section contains non-SOA"); + } + if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) { + FAILC(DNS_R_FORMERR, "update zone section contains multiple " + "RRs"); + } + + /* The zone section must have exactly one name. */ + result = dns_message_nextname(request, DNS_SECTION_ZONE); + if (result != ISC_R_NOMORE) { + FAILC(DNS_R_FORMERR, "update zone section contains multiple " + "RRs"); + } + + result = dns_zt_find(client->view->zonetable, zonename, 0, NULL, &zone); + if (result != ISC_R_SUCCESS) { + /* + * If we found a zone that is a parent of the update zonename, + * detach it so it isn't mentioned in log - it is irrelevant. + */ + if (zone != NULL) { + dns_zone_detach(&zone); + } + FAILN(DNS_R_NOTAUTH, zonename, + "not authoritative for update zone"); + } + + /* + * If there is a raw (unsigned) zone associated with this + * zone then it processes the UPDATE request. + */ + dns_zone_getraw(zone, &raw); + if (raw != NULL) { + dns_zone_detach(&zone); + dns_zone_attach(raw, &zone); + dns_zone_detach(&raw); + } + + switch (dns_zone_gettype(zone)) { + case dns_zone_primary: + case dns_zone_dlz: + /* + * We can now fail due to a bad signature as we now know + * that we are the primary. + */ + if (sigresult != ISC_R_SUCCESS) { + FAIL(sigresult); + } + dns_message_clonebuffer(client->message); + CHECK(send_update_event(client, zone)); + break; + case dns_zone_secondary: + case dns_zone_mirror: + dns_message_clonebuffer(client->message); + CHECK(send_forward_event(client, zone)); + break; + default: + FAILC(DNS_R_NOTAUTH, "not authoritative for update zone"); + } + return; + +failure: + if (result == DNS_R_REFUSED) { + inc_stats(client, zone, ns_statscounter_updaterej); + } + + /* + * We failed without having sent an update event to the zone. + * We are still in the client task context, so we can + * simply give an error response without switching tasks. + */ + if (result == DNS_R_DROP) { + ns_client_drop(client, result); + isc_nmhandle_detach(&client->reqhandle); + } else { + respond(client, result); + } + + if (zone != NULL) { + dns_zone_detach(&zone); + } +} + +/*% + * DS records are not allowed to exist without corresponding NS records, + * RFC 3658, 2.2 Protocol Change, + * "DS RRsets MUST NOT appear at non-delegation points or at a zone's apex". + */ + +static isc_result_t +remove_orphaned_ds(dns_db_t *db, dns_dbversion_t *newver, dns_diff_t *diff) { + isc_result_t result; + bool ns_exists; + dns_difftuple_t *tuple; + dns_diff_t temp_diff; + + dns_diff_init(diff->mctx, &temp_diff); + + for (tuple = ISC_LIST_HEAD(diff->tuples); tuple != NULL; + tuple = ISC_LIST_NEXT(tuple, link)) + { + if (!((tuple->op == DNS_DIFFOP_DEL && + tuple->rdata.type == dns_rdatatype_ns) || + (tuple->op == DNS_DIFFOP_ADD && + tuple->rdata.type == dns_rdatatype_ds))) + { + continue; + } + CHECK(rrset_exists(db, newver, &tuple->name, dns_rdatatype_ns, + 0, &ns_exists)); + if (ns_exists && + !dns_name_equal(&tuple->name, dns_db_origin(db))) + { + continue; + } + CHECK(delete_if(true_p, db, newver, &tuple->name, + dns_rdatatype_ds, 0, NULL, &temp_diff)); + } + result = ISC_R_SUCCESS; + +failure: + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = ISC_LIST_HEAD(temp_diff.tuples)) + { + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + dns_diff_appendminimal(diff, &tuple); + } + return (result); +} + +/* + * This implements the post load integrity checks for mx records. + */ +static isc_result_t +check_mx(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, + dns_dbversion_t *newver, dns_diff_t *diff) { + char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")]; + char ownerbuf[DNS_NAME_FORMATSIZE]; + char namebuf[DNS_NAME_FORMATSIZE]; + char altbuf[DNS_NAME_FORMATSIZE]; + dns_difftuple_t *t; + dns_fixedname_t fixed; + dns_name_t *foundname; + dns_rdata_mx_t mx; + dns_rdata_t rdata; + bool ok = true; + bool isaddress; + isc_result_t result; + struct in6_addr addr6; + struct in_addr addr; + dns_zoneopt_t options; + + foundname = dns_fixedname_initname(&fixed); + dns_rdata_init(&rdata); + options = dns_zone_getoptions(zone); + + for (t = ISC_LIST_HEAD(diff->tuples); t != NULL; + t = ISC_LIST_NEXT(t, link)) + { + if (t->op != DNS_DIFFOP_ADD || + t->rdata.type != dns_rdatatype_mx) + { + continue; + } + + result = dns_rdata_tostruct(&t->rdata, &mx, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + /* + * Check if we will error out if we attempt to reload the + * zone. + */ + dns_name_format(&mx.mx, namebuf, sizeof(namebuf)); + dns_name_format(&t->name, ownerbuf, sizeof(ownerbuf)); + isaddress = false; + if ((options & DNS_ZONEOPT_CHECKMX) != 0 && + strlcpy(tmp, namebuf, sizeof(tmp)) < sizeof(tmp)) + { + if (tmp[strlen(tmp) - 1] == '.') { + tmp[strlen(tmp) - 1] = '\0'; + } + if (inet_pton(AF_INET, tmp, &addr) == 1 || + inet_pton(AF_INET6, tmp, &addr6) == 1) + { + isaddress = true; + } + } + + if (isaddress && (options & DNS_ZONEOPT_CHECKMXFAIL) != 0) { + update_log(client, zone, ISC_LOG_ERROR, + "%s/MX: '%s': %s", ownerbuf, namebuf, + isc_result_totext(DNS_R_MXISADDRESS)); + ok = false; + } else if (isaddress) { + update_log(client, zone, ISC_LOG_WARNING, + "%s/MX: warning: '%s': %s", ownerbuf, + namebuf, + isc_result_totext(DNS_R_MXISADDRESS)); + } + + /* + * Check zone integrity checks. + */ + if ((options & DNS_ZONEOPT_CHECKINTEGRITY) == 0) { + continue; + } + result = dns_db_find(db, &mx.mx, newver, dns_rdatatype_a, 0, 0, + NULL, foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) { + continue; + } + + if (result == DNS_R_NXRRSET) { + result = dns_db_find(db, &mx.mx, newver, + dns_rdatatype_aaaa, 0, 0, NULL, + foundname, NULL, NULL); + if (result == ISC_R_SUCCESS) { + continue; + } + } + + if (result == DNS_R_NXRRSET || result == DNS_R_NXDOMAIN) { + update_log(client, zone, ISC_LOG_ERROR, + "%s/MX '%s' has no address records " + "(A or AAAA)", + ownerbuf, namebuf); + ok = false; + } else if (result == DNS_R_CNAME) { + update_log(client, zone, ISC_LOG_ERROR, + "%s/MX '%s' is a CNAME (illegal)", ownerbuf, + namebuf); + ok = false; + } else if (result == DNS_R_DNAME) { + dns_name_format(foundname, altbuf, sizeof altbuf); + update_log(client, zone, ISC_LOG_ERROR, + "%s/MX '%s' is below a DNAME '%s' (illegal)", + ownerbuf, namebuf, altbuf); + ok = false; + } + } + return (ok ? ISC_R_SUCCESS : DNS_R_REFUSED); +} + +static isc_result_t +rr_exists(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name, + const dns_rdata_t *rdata, bool *flag) { + dns_rdataset_t rdataset; + dns_dbnode_t *node = NULL; + isc_result_t result; + + dns_rdataset_init(&rdataset); + if (rdata->type == dns_rdatatype_nsec3) { + result = dns_db_findnsec3node(db, name, false, &node); + } else { + result = dns_db_findnode(db, name, false, &node); + } + if (result == ISC_R_NOTFOUND) { + *flag = false; + result = ISC_R_SUCCESS; + goto failure; + } else { + CHECK(result); + } + result = dns_db_findrdataset(db, node, ver, rdata->type, 0, + (isc_stdtime_t)0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) { + *flag = false; + result = ISC_R_SUCCESS; + goto failure; + } + + for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + dns_rdata_t myrdata = DNS_RDATA_INIT; + dns_rdataset_current(&rdataset, &myrdata); + if (!dns_rdata_casecompare(&myrdata, rdata)) { + break; + } + } + dns_rdataset_disassociate(&rdataset); + if (result == ISC_R_SUCCESS) { + *flag = true; + } else if (result == ISC_R_NOMORE) { + *flag = false; + result = ISC_R_SUCCESS; + } + +failure: + if (node != NULL) { + dns_db_detachnode(db, &node); + } + return (result); +} + +static isc_result_t +get_iterations(dns_db_t *db, dns_dbversion_t *ver, dns_rdatatype_t privatetype, + unsigned int *iterationsp) { + dns_dbnode_t *node = NULL; + dns_rdata_nsec3param_t nsec3param; + dns_rdataset_t rdataset; + isc_result_t result; + unsigned int iterations = 0; + + dns_rdataset_init(&rdataset); + + result = dns_db_getoriginnode(db, &node); + if (result != ISC_R_SUCCESS) { + return (result); + } + result = dns_db_findrdataset(db, node, ver, dns_rdatatype_nsec3param, 0, + (isc_stdtime_t)0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) { + goto try_private; + } + if (result != ISC_R_SUCCESS) { + goto failure; + } + + for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdataset_current(&rdataset, &rdata); + CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); + if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) { + continue; + } + if (nsec3param.iterations > iterations) { + iterations = nsec3param.iterations; + } + } + if (result != ISC_R_NOMORE) { + goto failure; + } + + dns_rdataset_disassociate(&rdataset); + +try_private: + if (privatetype == 0) { + goto success; + } + + result = dns_db_findrdataset(db, node, ver, privatetype, 0, + (isc_stdtime_t)0, &rdataset, NULL); + if (result == ISC_R_NOTFOUND) { + goto success; + } + if (result != ISC_R_SUCCESS) { + goto failure; + } + + for (result = dns_rdataset_first(&rdataset); result == ISC_R_SUCCESS; + result = dns_rdataset_next(&rdataset)) + { + unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; + dns_rdata_t private = DNS_RDATA_INIT; + dns_rdata_t rdata = DNS_RDATA_INIT; + + dns_rdataset_current(&rdataset, &rdata); + if (!dns_nsec3param_fromprivate(&private, &rdata, buf, + sizeof(buf))) + { + continue; + } + CHECK(dns_rdata_tostruct(&rdata, &nsec3param, NULL)); + if ((nsec3param.flags & DNS_NSEC3FLAG_REMOVE) != 0) { + continue; + } + if (nsec3param.iterations > iterations) { + iterations = nsec3param.iterations; + } + } + if (result != ISC_R_NOMORE) { + goto failure; + } + +success: + *iterationsp = iterations; + result = ISC_R_SUCCESS; + +failure: + if (node != NULL) { + dns_db_detachnode(db, &node); + } + if (dns_rdataset_isassociated(&rdataset)) { + dns_rdataset_disassociate(&rdataset); + } + return (result); +} + +/* + * Prevent the zone entering a inconsistent state where + * NSEC only DNSKEYs are present with NSEC3 chains. + */ +static isc_result_t +check_dnssec(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, + dns_dbversion_t *ver, dns_diff_t *diff) { + isc_result_t result; + unsigned int iterations = 0; + dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); + + /* Refuse to allow NSEC3 with NSEC-only keys */ + if (!dns_zone_check_dnskey_nsec3(zone, db, ver, diff, NULL, 0)) { + update_log(client, zone, ISC_LOG_ERROR, + "NSEC only DNSKEYs and NSEC3 chains not allowed"); + result = DNS_R_REFUSED; + goto failure; + } + + /* Verify NSEC3 params */ + CHECK(get_iterations(db, ver, privatetype, &iterations)); + if (iterations > dns_nsec3_maxiterations()) { + update_log(client, zone, ISC_LOG_ERROR, + "too many NSEC3 iterations (%u)", iterations); + result = DNS_R_REFUSED; + goto failure; + } + +failure: + return (result); +} + +/* + * Delay NSEC3PARAM changes as they need to be applied to the whole zone. + */ +static isc_result_t +add_nsec3param_records(ns_client_t *client, dns_zone_t *zone, dns_db_t *db, + dns_dbversion_t *ver, dns_diff_t *diff) { + isc_result_t result = ISC_R_SUCCESS; + dns_difftuple_t *tuple, *newtuple = NULL, *next; + dns_rdata_t rdata = DNS_RDATA_INIT; + unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1]; + dns_diff_t temp_diff; + dns_diffop_t op; + bool flag; + dns_name_t *name = dns_zone_getorigin(zone); + dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); + uint32_t ttl = 0; + bool ttl_good = false; + + update_log(client, zone, ISC_LOG_DEBUG(3), + "checking for NSEC3PARAM changes"); + + dns_diff_init(diff->mctx, &temp_diff); + + /* + * Extract NSEC3PARAM tuples from list. + */ + for (tuple = ISC_LIST_HEAD(diff->tuples); tuple != NULL; tuple = next) { + next = ISC_LIST_NEXT(tuple, link); + + if (tuple->rdata.type != dns_rdatatype_nsec3param || + !dns_name_equal(name, &tuple->name)) + { + continue; + } + ISC_LIST_UNLINK(diff->tuples, tuple, link); + ISC_LIST_APPEND(temp_diff.tuples, tuple, link); + } + + /* + * Extract TTL changes pairs, we don't need to convert these to + * delayed changes. + */ + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = next) + { + if (tuple->op == DNS_DIFFOP_ADD) { + if (!ttl_good) { + /* + * Any adds here will contain the final + * NSEC3PARAM RRset TTL. + */ + ttl = tuple->ttl; + ttl_good = true; + } + /* + * Walk the temp_diff list looking for the + * corresponding delete. + */ + next = ISC_LIST_HEAD(temp_diff.tuples); + while (next != NULL) { + unsigned char *next_data = next->rdata.data; + unsigned char *tuple_data = tuple->rdata.data; + if (next->op == DNS_DIFFOP_DEL && + next->rdata.length == tuple->rdata.length && + !memcmp(next_data, tuple_data, + next->rdata.length)) + { + ISC_LIST_UNLINK(temp_diff.tuples, next, + link); + ISC_LIST_APPEND(diff->tuples, next, + link); + break; + } + next = ISC_LIST_NEXT(next, link); + } + /* + * If we have not found a pair move onto the next + * tuple. + */ + if (next == NULL) { + next = ISC_LIST_NEXT(tuple, link); + continue; + } + /* + * Find the next tuple to be processed before + * unlinking then complete moving the pair to 'diff'. + */ + next = ISC_LIST_NEXT(tuple, link); + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + ISC_LIST_APPEND(diff->tuples, tuple, link); + } else { + next = ISC_LIST_NEXT(tuple, link); + } + } + + /* + * Preserve any ongoing changes from a BIND 9.6.x upgrade. + * + * Any NSEC3PARAM records with flags other than OPTOUT named + * in managing and should not be touched so revert such changes + * taking into account any TTL change of the NSEC3PARAM RRset. + */ + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = next) + { + next = ISC_LIST_NEXT(tuple, link); + if ((tuple->rdata.data[1] & ~DNS_NSEC3FLAG_OPTOUT) != 0) { + /* + * If we haven't had any adds then the tuple->ttl must + * be the original ttl and should be used for any + * future changes. + */ + if (!ttl_good) { + ttl = tuple->ttl; + ttl_good = true; + } + op = (tuple->op == DNS_DIFFOP_DEL) ? DNS_DIFFOP_ADD + : DNS_DIFFOP_DEL; + CHECK(dns_difftuple_create(diff->mctx, op, name, ttl, + &tuple->rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + dns_diff_appendminimal(diff, &tuple); + } + } + + /* + * We now have just the actual changes to the NSEC3PARAM RRset. + * Convert the adds to delayed adds and the deletions into delayed + * deletions. + */ + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = next) + { + /* + * If we haven't had any adds then the tuple->ttl must be the + * original ttl and should be used for any future changes. + */ + if (!ttl_good) { + ttl = tuple->ttl; + ttl_good = true; + } + if (tuple->op == DNS_DIFFOP_ADD) { + bool nseconly = false; + + /* + * Look for any deletes which match this ADD ignoring + * flags. We don't need to explicitly remove them as + * they will be removed a side effect of processing + * the add. + */ + next = ISC_LIST_HEAD(temp_diff.tuples); + while (next != NULL) { + unsigned char *next_data = next->rdata.data; + unsigned char *tuple_data = tuple->rdata.data; + if (next->op != DNS_DIFFOP_DEL || + next->rdata.length != tuple->rdata.length || + next_data[0] != tuple_data[0] || + next_data[2] != tuple_data[2] || + next_data[3] != tuple_data[3] || + memcmp(next_data + 4, tuple_data + 4, + tuple->rdata.length - 4)) + { + next = ISC_LIST_NEXT(next, link); + continue; + } + ISC_LIST_UNLINK(temp_diff.tuples, next, link); + ISC_LIST_APPEND(diff->tuples, next, link); + next = ISC_LIST_HEAD(temp_diff.tuples); + } + + /* + * Create a private-type record to signal that + * we want a delayed NSEC3 chain add/delete + */ + dns_nsec3param_toprivate(&tuple->rdata, &rdata, + privatetype, buf, sizeof(buf)); + buf[2] |= DNS_NSEC3FLAG_CREATE; + + /* + * If the zone is not currently capable of + * supporting an NSEC3 chain, then we set the + * INITIAL flag to indicate that these parameters + * are to be used later. + * + * Don't provide a 'diff' here because we want to + * know the capability of the current database. + */ + result = dns_nsec_nseconly(db, ver, NULL, &nseconly); + if (result == ISC_R_NOTFOUND || nseconly) { + buf[2] |= DNS_NSEC3FLAG_INITIAL; + } + + /* + * See if this CREATE request already exists. + */ + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + + if (!flag) { + CHECK(dns_difftuple_create( + diff->mctx, DNS_DIFFOP_ADD, name, 0, + &rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + } + + /* + * Remove any existing CREATE request to add an + * otherwise identical chain with a reversed + * OPTOUT state. + */ + buf[2] ^= DNS_NSEC3FLAG_OPTOUT; + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + + if (flag) { + CHECK(dns_difftuple_create( + diff->mctx, DNS_DIFFOP_DEL, name, 0, + &rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + } + + /* + * Find the next tuple to be processed and remove the + * temporary add record. + */ + next = ISC_LIST_NEXT(tuple, link); + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, + name, ttl, &tuple->rdata, + &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + dns_diff_appendminimal(diff, &tuple); + dns_rdata_reset(&rdata); + } else { + next = ISC_LIST_NEXT(tuple, link); + } + } + + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = next) + { + INSIST(ttl_good); + + next = ISC_LIST_NEXT(tuple, link); + /* + * See if we already have a REMOVE request in progress. + */ + dns_nsec3param_toprivate(&tuple->rdata, &rdata, privatetype, + buf, sizeof(buf)); + + buf[2] |= DNS_NSEC3FLAG_REMOVE | DNS_NSEC3FLAG_NONSEC; + + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + if (!flag) { + buf[2] &= ~DNS_NSEC3FLAG_NONSEC; + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + } + + if (!flag) { + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, + name, 0, &rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + } + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, + ttl, &tuple->rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + dns_diff_appendminimal(diff, &tuple); + dns_rdata_reset(&rdata); + } + + result = ISC_R_SUCCESS; +failure: + dns_diff_clear(&temp_diff); + return (result); +} + +static isc_result_t +rollback_private(dns_db_t *db, dns_rdatatype_t privatetype, + dns_dbversion_t *ver, dns_diff_t *diff) { + dns_diff_t temp_diff; + dns_diffop_t op; + dns_difftuple_t *tuple, *newtuple = NULL, *next; + dns_name_t *name = dns_db_origin(db); + isc_mem_t *mctx = diff->mctx; + isc_result_t result; + + if (privatetype == 0) { + return (ISC_R_SUCCESS); + } + + dns_diff_init(mctx, &temp_diff); + + /* + * Extract the changes to be rolled back. + */ + for (tuple = ISC_LIST_HEAD(diff->tuples); tuple != NULL; tuple = next) { + next = ISC_LIST_NEXT(tuple, link); + + if (tuple->rdata.type != privatetype || + !dns_name_equal(name, &tuple->name)) + { + continue; + } + + /* + * Allow records which indicate that a zone has been + * signed with a DNSKEY to be removed. + */ + if (tuple->op == DNS_DIFFOP_DEL && tuple->rdata.length == 5 && + tuple->rdata.data[0] != 0 && tuple->rdata.data[4] != 0) + { + continue; + } + + ISC_LIST_UNLINK(diff->tuples, tuple, link); + ISC_LIST_PREPEND(temp_diff.tuples, tuple, link); + } + + /* + * Rollback the changes. + */ + while ((tuple = ISC_LIST_HEAD(temp_diff.tuples)) != NULL) { + op = (tuple->op == DNS_DIFFOP_DEL) ? DNS_DIFFOP_ADD + : DNS_DIFFOP_DEL; + CHECK(dns_difftuple_create(mctx, op, name, tuple->ttl, + &tuple->rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, &temp_diff)); + } + result = ISC_R_SUCCESS; + +failure: + dns_diff_clear(&temp_diff); + return (result); +} + +/* + * Add records to cause the delayed signing of the zone by added DNSKEY + * to remove the RRSIG records generated by a deleted DNSKEY. + */ +static isc_result_t +add_signing_records(dns_db_t *db, dns_rdatatype_t privatetype, + dns_dbversion_t *ver, dns_diff_t *diff) { + dns_difftuple_t *tuple, *newtuple = NULL, *next; + dns_rdata_dnskey_t dnskey; + dns_rdata_t rdata = DNS_RDATA_INIT; + bool flag; + isc_region_t r; + isc_result_t result = ISC_R_SUCCESS; + uint16_t keyid; + unsigned char buf[5]; + dns_name_t *name = dns_db_origin(db); + dns_diff_t temp_diff; + + dns_diff_init(diff->mctx, &temp_diff); + + /* + * Extract the DNSKEY tuples from the list. + */ + for (tuple = ISC_LIST_HEAD(diff->tuples); tuple != NULL; tuple = next) { + next = ISC_LIST_NEXT(tuple, link); + + if (tuple->rdata.type != dns_rdatatype_dnskey) { + continue; + } + + ISC_LIST_UNLINK(diff->tuples, tuple, link); + ISC_LIST_APPEND(temp_diff.tuples, tuple, link); + } + + /* + * Extract TTL changes pairs, we don't need signing records for these. + */ + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = next) + { + if (tuple->op == DNS_DIFFOP_ADD) { + /* + * Walk the temp_diff list looking for the + * corresponding delete. + */ + next = ISC_LIST_HEAD(temp_diff.tuples); + while (next != NULL) { + unsigned char *next_data = next->rdata.data; + unsigned char *tuple_data = tuple->rdata.data; + if (next->op == DNS_DIFFOP_DEL && + dns_name_equal(&tuple->name, &next->name) && + next->rdata.length == tuple->rdata.length && + !memcmp(next_data, tuple_data, + next->rdata.length)) + { + ISC_LIST_UNLINK(temp_diff.tuples, next, + link); + ISC_LIST_APPEND(diff->tuples, next, + link); + break; + } + next = ISC_LIST_NEXT(next, link); + } + /* + * If we have not found a pair move onto the next + * tuple. + */ + if (next == NULL) { + next = ISC_LIST_NEXT(tuple, link); + continue; + } + /* + * Find the next tuple to be processed before + * unlinking then complete moving the pair to 'diff'. + */ + next = ISC_LIST_NEXT(tuple, link); + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + ISC_LIST_APPEND(diff->tuples, tuple, link); + } else { + next = ISC_LIST_NEXT(tuple, link); + } + } + + /* + * Process the remaining DNSKEY entries. + */ + for (tuple = ISC_LIST_HEAD(temp_diff.tuples); tuple != NULL; + tuple = ISC_LIST_HEAD(temp_diff.tuples)) + { + ISC_LIST_UNLINK(temp_diff.tuples, tuple, link); + ISC_LIST_APPEND(diff->tuples, tuple, link); + + result = dns_rdata_tostruct(&tuple->rdata, &dnskey, NULL); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + if ((dnskey.flags & (DNS_KEYFLAG_OWNERMASK | + DNS_KEYTYPE_NOAUTH)) != DNS_KEYOWNER_ZONE) + { + continue; + } + + dns_rdata_toregion(&tuple->rdata, &r); + + keyid = dst_region_computeid(&r); + + buf[0] = dnskey.algorithm; + buf[1] = (keyid & 0xff00) >> 8; + buf[2] = (keyid & 0xff); + buf[3] = (tuple->op == DNS_DIFFOP_ADD) ? 0 : 1; + buf[4] = 0; + rdata.data = buf; + rdata.length = sizeof(buf); + rdata.type = privatetype; + rdata.rdclass = tuple->rdata.rdclass; + + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + if (flag) { + continue; + } + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0, + &rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + INSIST(newtuple == NULL); + /* + * Remove any record which says this operation has already + * completed. + */ + buf[4] = 1; + CHECK(rr_exists(db, ver, name, &rdata, &flag)); + if (flag) { + CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, + name, 0, &rdata, &newtuple)); + CHECK(do_one_tuple(&newtuple, db, ver, diff)); + INSIST(newtuple == NULL); + } + } + +failure: + dns_diff_clear(&temp_diff); + return (result); +} + +static bool +isdnssec(dns_db_t *db, dns_dbversion_t *ver, dns_rdatatype_t privatetype) { + isc_result_t result; + bool build_nsec, build_nsec3; + + if (dns_db_issecure(db)) { + return (true); + } + + result = dns_private_chains(db, ver, privatetype, &build_nsec, + &build_nsec3); + RUNTIME_CHECK(result == ISC_R_SUCCESS); + return (build_nsec || build_nsec3); +} + +static void +update_action(isc_task_t *task, isc_event_t *event) { + update_event_t *uev = (update_event_t *)event; + dns_zone_t *zone = uev->zone; + ns_client_t *client = (ns_client_t *)event->ev_arg; + const dns_ssurule_t **rules = uev->rules; + size_t rule = 0, ruleslen = uev->ruleslen; + isc_result_t result; + dns_db_t *db = NULL; + dns_dbversion_t *oldver = NULL; + dns_dbversion_t *ver = NULL; + dns_diff_t diff; /* Pending updates. */ + dns_diff_t temp; /* Pending RR existence assertions. */ + bool soa_serial_changed = false; + isc_mem_t *mctx = client->mctx; + dns_rdatatype_t covers; + dns_message_t *request = client->message; + dns_rdataclass_t zoneclass; + dns_name_t *zonename = NULL; + dns_ssutable_t *ssutable = NULL; + dns_fixedname_t tmpnamefixed; + dns_name_t *tmpname = NULL; + dns_zoneopt_t options; + dns_difftuple_t *tuple; + dns_rdata_dnskey_t dnskey; + bool had_dnskey; + dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone); + dns_ttl_t maxttl = 0; + uint32_t maxrecords; + uint64_t records; + + INSIST(event->ev_type == DNS_EVENT_UPDATE); + + dns_diff_init(mctx, &diff); + dns_diff_init(mctx, &temp); + + CHECK(dns_zone_getdb(zone, &db)); + zonename = dns_db_origin(db); + zoneclass = dns_db_class(db); + dns_zone_getssutable(zone, &ssutable); + options = dns_zone_getoptions(zone); + + /* + * Get old and new versions now that queryacl has been checked. + */ + dns_db_currentversion(db, &oldver); + CHECK(dns_db_newversion(db, &ver)); + + /* + * Check prerequisites. + */ + + for (result = dns_message_firstname(request, DNS_SECTION_PREREQUISITE); + result == ISC_R_SUCCESS; + result = dns_message_nextname(request, DNS_SECTION_PREREQUISITE)) + { + dns_name_t *name = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_ttl_t ttl; + dns_rdataclass_t update_class; + bool flag; + + get_current_rr(request, DNS_SECTION_PREREQUISITE, zoneclass, + &name, &rdata, &covers, &ttl, &update_class); + + if (ttl != 0) { + PREREQFAILC(DNS_R_FORMERR, "prerequisite TTL is not " + "zero"); + } + + if (!dns_name_issubdomain(name, zonename)) { + PREREQFAILN(DNS_R_NOTZONE, name, + "prerequisite name is out of zone"); + } + + if (update_class == dns_rdataclass_any) { + if (rdata.length != 0) { + PREREQFAILC(DNS_R_FORMERR, "class ANY " + "prerequisite " + "RDATA is not " + "empty"); + } + if (rdata.type == dns_rdatatype_any) { + CHECK(name_exists(db, ver, name, &flag)); + if (!flag) { + PREREQFAILN(DNS_R_NXDOMAIN, name, + "'name in use' " + "prerequisite not " + "satisfied"); + } + } else { + CHECK(rrset_exists(db, ver, name, rdata.type, + covers, &flag)); + if (!flag) { + /* RRset does not exist. */ + PREREQFAILNT(DNS_R_NXRRSET, name, + rdata.type, + "'rrset exists (value " + "independent)' " + "prerequisite not " + "satisfied"); + } + } + } else if (update_class == dns_rdataclass_none) { + if (rdata.length != 0) { + PREREQFAILC(DNS_R_FORMERR, "class NONE " + "prerequisite " + "RDATA is not " + "empty"); + } + if (rdata.type == dns_rdatatype_any) { + CHECK(name_exists(db, ver, name, &flag)); + if (flag) { + PREREQFAILN(DNS_R_YXDOMAIN, name, + "'name not in use' " + "prerequisite not " + "satisfied"); + } + } else { + CHECK(rrset_exists(db, ver, name, rdata.type, + covers, &flag)); + if (flag) { + /* RRset exists. */ + PREREQFAILNT(DNS_R_YXRRSET, name, + rdata.type, + "'rrset does not exist' " + "prerequisite not " + "satisfied"); + } + } + } else if (update_class == zoneclass) { + /* "temp<rr.name, rr.type> += rr;" */ + result = temp_append(&temp, name, &rdata); + if (result != ISC_R_SUCCESS) { + UNEXPECTED_ERROR( + "temp entry creation failed: %s", + isc_result_totext(result)); + FAIL(ISC_R_UNEXPECTED); + } + } else { + PREREQFAILC(DNS_R_FORMERR, "malformed prerequisite"); + } + } + if (result != ISC_R_NOMORE) { + FAIL(result); + } + + /* + * Perform the final check of the "rrset exists (value dependent)" + * prerequisites. + */ + if (ISC_LIST_HEAD(temp.tuples) != NULL) { + dns_rdatatype_t type; + + /* + * Sort the prerequisite records by owner name, + * type, and rdata. + */ + result = dns_diff_sort(&temp, temp_order); + if (result != ISC_R_SUCCESS) { + FAILC(result, "'RRset exists (value dependent)' " + "prerequisite not satisfied"); + } + + tmpname = dns_fixedname_initname(&tmpnamefixed); + result = temp_check(mctx, &temp, db, ver, tmpname, &type); + if (result != ISC_R_SUCCESS) { + FAILNT(result, tmpname, type, + "'RRset exists (value dependent)' " + "prerequisite not satisfied"); + } + } + + update_log(client, zone, LOGLEVEL_DEBUG, "prerequisites are OK"); + + /* + * Process the Update Section. + */ + INSIST(ssutable == NULL || rules != NULL); + for (rule = 0, + result = dns_message_firstname(request, DNS_SECTION_UPDATE); + result == ISC_R_SUCCESS; + rule++, result = dns_message_nextname(request, DNS_SECTION_UPDATE)) + { + dns_name_t *name = NULL; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_ttl_t ttl; + dns_rdataclass_t update_class; + bool flag; + + INSIST(ssutable == NULL || rule < ruleslen); + + get_current_rr(request, DNS_SECTION_UPDATE, zoneclass, &name, + &rdata, &covers, &ttl, &update_class); + + if (update_class == zoneclass) { + unsigned int max = 0; + + /* + * RFC1123 doesn't allow MF and MD in master files. + */ + if (rdata.type == dns_rdatatype_md || + rdata.type == dns_rdatatype_mf) + { + char typebuf[DNS_RDATATYPE_FORMATSIZE]; + + dns_rdatatype_format(rdata.type, typebuf, + sizeof(typebuf)); + update_log(client, zone, LOGLEVEL_PROTOCOL, + "attempt to add %s ignored", + typebuf); + continue; + } + if ((rdata.type == dns_rdatatype_ns || + rdata.type == dns_rdatatype_dname) && + dns_name_iswildcard(name)) + { + char typebuf[DNS_RDATATYPE_FORMATSIZE]; + + dns_rdatatype_format(rdata.type, typebuf, + sizeof(typebuf)); + update_log(client, zone, LOGLEVEL_PROTOCOL, + "attempt to add wildcard %s record " + "ignored", + typebuf); + continue; + } + if (rdata.type == dns_rdatatype_cname) { + CHECK(cname_incompatible_rrset_exists( + db, ver, name, &flag)); + if (flag) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to add CNAME " + "alongside non-CNAME " + "ignored"); + continue; + } + } else { + CHECK(rrset_exists(db, ver, name, + dns_rdatatype_cname, 0, + &flag)); + if (flag && !dns_rdatatype_atcname(rdata.type)) + { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to add non-CNAME " + "alongside CNAME ignored"); + continue; + } + } + if (rdata.type == dns_rdatatype_soa) { + bool ok; + CHECK(rrset_exists(db, ver, name, + dns_rdatatype_soa, 0, + &flag)); + if (!flag) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to create 2nd " + "SOA ignored"); + continue; + } + CHECK(check_soa_increment(db, ver, &rdata, + &ok)); + if (!ok) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "SOA update failed to " + "increment serial, " + "ignoring it"); + continue; + } + soa_serial_changed = true; + } + + if (dns_rdatatype_atparent(rdata.type) && + dns_name_equal(name, zonename)) + { + char typebuf[DNS_RDATATYPE_FORMATSIZE]; + + dns_rdatatype_format(rdata.type, typebuf, + sizeof(typebuf)); + update_log(client, zone, LOGLEVEL_PROTOCOL, + "attempt to add a %s record at " + "zone apex ignored", + typebuf); + continue; + } + + if (rdata.type == privatetype) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "attempt to add a private type " + "(%u) record rejected internal " + "use only", + privatetype); + continue; + } + + if (rdata.type == dns_rdatatype_nsec3param) { + /* + * Ignore attempts to add NSEC3PARAM records + * with any flags other than OPTOUT. + */ + if ((rdata.data[1] & ~DNS_NSEC3FLAG_OPTOUT) != + 0) + { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to add NSEC3PARAM " + "record with non OPTOUT " + "flag"); + continue; + } + } + + if ((options & DNS_ZONEOPT_CHECKWILDCARD) != 0 && + dns_name_internalwildcard(name)) + { + char namestr[DNS_NAME_FORMATSIZE]; + dns_name_format(name, namestr, sizeof(namestr)); + update_log(client, zone, LOGLEVEL_PROTOCOL, + "warning: ownername '%s' contains " + "a non-terminal wildcard", + namestr); + } + + if ((options & DNS_ZONEOPT_CHECKTTL) != 0) { + maxttl = dns_zone_getmaxttl(zone); + if (ttl > maxttl) { + ttl = maxttl; + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "reducing TTL to the " + "configured max-zone-ttl %d", + maxttl); + } + } + + if (rules != NULL && rules[rule] != NULL) { + max = dns_ssurule_max(rules[rule], rdata.type); + } + if (max != 0) { + unsigned int count = 0; + CHECK(foreach_rr(db, ver, name, rdata.type, + covers, count_action, &count)); + if (count >= max) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to add more " + "records than permitted by " + "policy max=%u", + max); + continue; + } + } + + if (isc_log_wouldlog(ns_lctx, LOGLEVEL_PROTOCOL)) { + char namestr[DNS_NAME_FORMATSIZE]; + char typestr[DNS_RDATATYPE_FORMATSIZE]; + char rdstr[2048]; + isc_buffer_t buf; + int len = 0; + const char *truncated = ""; + + dns_name_format(name, namestr, sizeof(namestr)); + dns_rdatatype_format(rdata.type, typestr, + sizeof(typestr)); + isc_buffer_init(&buf, rdstr, sizeof(rdstr)); + result = dns_rdata_totext(&rdata, NULL, &buf); + if (result == ISC_R_NOSPACE) { + len = (int)isc_buffer_usedlength(&buf); + truncated = " [TRUNCATED]"; + } else if (result != ISC_R_SUCCESS) { + snprintf(rdstr, sizeof(rdstr), + "[dns_" + "rdata_totext failed: %s]", + isc_result_totext(result)); + len = strlen(rdstr); + } else { + len = (int)isc_buffer_usedlength(&buf); + } + update_log(client, zone, LOGLEVEL_PROTOCOL, + "adding an RR at '%s' %s %.*s%s", + namestr, typestr, len, rdstr, + truncated); + } + + /* Prepare the affected RRset for the addition. */ + { + add_rr_prepare_ctx_t ctx; + ctx.db = db; + ctx.ver = ver; + ctx.diff = &diff; + ctx.name = name; + ctx.oldname = name; + ctx.update_rr = &rdata; + ctx.update_rr_ttl = ttl; + ctx.ignore_add = false; + dns_diff_init(mctx, &ctx.del_diff); + dns_diff_init(mctx, &ctx.add_diff); + CHECK(foreach_rr(db, ver, name, rdata.type, + covers, add_rr_prepare_action, + &ctx)); + + if (ctx.ignore_add) { + dns_diff_clear(&ctx.del_diff); + dns_diff_clear(&ctx.add_diff); + } else { + result = do_diff(&ctx.del_diff, db, ver, + &diff); + if (result == ISC_R_SUCCESS) { + result = do_diff(&ctx.add_diff, + db, ver, + &diff); + } + if (result != ISC_R_SUCCESS) { + dns_diff_clear(&ctx.del_diff); + dns_diff_clear(&ctx.add_diff); + goto failure; + } + CHECK(update_one_rr(db, ver, &diff, + DNS_DIFFOP_ADD, + name, ttl, &rdata)); + } + } + } else if (update_class == dns_rdataclass_any) { + if (rdata.type == dns_rdatatype_any) { + if (isc_log_wouldlog(ns_lctx, + LOGLEVEL_PROTOCOL)) + { + char namestr[DNS_NAME_FORMATSIZE]; + dns_name_format(name, namestr, + sizeof(namestr)); + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "delete all rrsets from " + "name '%s'", + namestr); + } + if (dns_name_equal(name, zonename)) { + CHECK(delete_if(type_not_soa_nor_ns_p, + db, ver, name, + dns_rdatatype_any, 0, + &rdata, &diff)); + } else { + CHECK(delete_if(type_not_dnssec, db, + ver, name, + dns_rdatatype_any, 0, + &rdata, &diff)); + } + } else if (dns_name_equal(name, zonename) && + (rdata.type == dns_rdatatype_soa || + rdata.type == dns_rdatatype_ns)) + { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "attempt to delete all SOA " + "or NS records ignored"); + continue; + } else { + if (isc_log_wouldlog(ns_lctx, + LOGLEVEL_PROTOCOL)) + { + char namestr[DNS_NAME_FORMATSIZE]; + char typestr[DNS_RDATATYPE_FORMATSIZE]; + dns_name_format(name, namestr, + sizeof(namestr)); + dns_rdatatype_format(rdata.type, + typestr, + sizeof(typestr)); + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "deleting rrset at '%s' %s", + namestr, typestr); + } + CHECK(delete_if(true_p, db, ver, name, + rdata.type, covers, &rdata, + &diff)); + } + } else if (update_class == dns_rdataclass_none) { + char namestr[DNS_NAME_FORMATSIZE]; + char typestr[DNS_RDATATYPE_FORMATSIZE]; + + /* + * The (name == zonename) condition appears in + * RFC2136 3.4.2.4 but is missing from the pseudocode. + */ + if (dns_name_equal(name, zonename)) { + if (rdata.type == dns_rdatatype_soa) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to delete SOA " + "ignored"); + continue; + } + if (rdata.type == dns_rdatatype_ns) { + int count; + CHECK(rr_count(db, ver, name, + dns_rdatatype_ns, 0, + &count)); + if (count == 1) { + update_log(client, zone, + LOGLEVEL_PROTOCOL, + "attempt to " + "delete last " + "NS ignored"); + continue; + } + } + } + dns_name_format(name, namestr, sizeof(namestr)); + dns_rdatatype_format(rdata.type, typestr, + sizeof(typestr)); + update_log(client, zone, LOGLEVEL_PROTOCOL, + "deleting an RR at %s %s", namestr, typestr); + CHECK(delete_if(rr_equal_p, db, ver, name, rdata.type, + covers, &rdata, &diff)); + } + } + if (result != ISC_R_NOMORE) { + FAIL(result); + } + + /* + * Check that any changes to DNSKEY/NSEC3PARAM records make sense. + * If they don't then back out all changes to DNSKEY/NSEC3PARAM + * records. + */ + if (!ISC_LIST_EMPTY(diff.tuples)) { + CHECK(check_dnssec(client, zone, db, ver, &diff)); + } + + if (!ISC_LIST_EMPTY(diff.tuples)) { + unsigned int errors = 0; + CHECK(dns_zone_nscheck(zone, db, ver, &errors)); + if (errors != 0) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "update rejected: post update name server " + "sanity check failed"); + result = DNS_R_REFUSED; + goto failure; + } + } + if (!ISC_LIST_EMPTY(diff.tuples)) { + result = dns_zone_cdscheck(zone, db, ver); + if (result == DNS_R_BADCDS || result == DNS_R_BADCDNSKEY) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "update rejected: bad %s RRset", + result == DNS_R_BADCDS ? "CDS" : "CDNSKEY"); + result = DNS_R_REFUSED; + goto failure; + } + if (result != ISC_R_SUCCESS) { + goto failure; + } + } + + /* + * If any changes were made, increment the SOA serial number, + * update RRSIGs and NSECs (if zone is secure), and write the update + * to the journal. + */ + if (!ISC_LIST_EMPTY(diff.tuples)) { + char *journalfile; + dns_journal_t *journal; + bool has_dnskey; + + /* + * Increment the SOA serial, but only if it was not + * changed as a result of an update operation. + */ + if (!soa_serial_changed) { + CHECK(update_soa_serial( + db, ver, &diff, mctx, + dns_zone_getserialupdatemethod(zone))); + } + + CHECK(check_mx(client, zone, db, ver, &diff)); + + CHECK(remove_orphaned_ds(db, ver, &diff)); + + CHECK(rrset_exists(db, ver, zonename, dns_rdatatype_dnskey, 0, + &has_dnskey)); + +#define ALLOW_SECURE_TO_INSECURE(zone) \ + ((dns_zone_getoptions(zone) & DNS_ZONEOPT_SECURETOINSECURE) != 0) + + CHECK(rrset_exists(db, oldver, zonename, dns_rdatatype_dnskey, + 0, &had_dnskey)); + if (!ALLOW_SECURE_TO_INSECURE(zone)) { + if (had_dnskey && !has_dnskey) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "update rejected: all DNSKEY " + "records removed and " + "'dnssec-secure-to-insecure' " + "not set"); + result = DNS_R_REFUSED; + goto failure; + } + } + + CHECK(rollback_private(db, privatetype, ver, &diff)); + + CHECK(add_signing_records(db, privatetype, ver, &diff)); + + CHECK(add_nsec3param_records(client, zone, db, ver, &diff)); + + if (had_dnskey && !has_dnskey) { + /* + * We are transitioning from secure to insecure. + * Cause all NSEC3 chains to be deleted. When the + * the last signature for the DNSKEY records are + * remove any NSEC chain present will also be removed. + */ + CHECK(dns_nsec3param_deletechains(db, ver, zone, true, + &diff)); + } else if (has_dnskey && isdnssec(db, ver, privatetype)) { + dns_update_log_t log; + uint32_t interval = + dns_zone_getsigvalidityinterval(zone); + + log.func = update_log_cb; + log.arg = client; + result = dns_update_signatures(&log, zone, db, oldver, + ver, &diff, interval); + + if (result != ISC_R_SUCCESS) { + update_log(client, zone, ISC_LOG_ERROR, + "RRSIG/NSEC/NSEC3 update failed: %s", + isc_result_totext(result)); + goto failure; + } + } + + maxrecords = dns_zone_getmaxrecords(zone); + if (maxrecords != 0U) { + result = dns_db_getsize(db, ver, &records, NULL); + if (result == ISC_R_SUCCESS && records > maxrecords) { + update_log(client, zone, ISC_LOG_ERROR, + "records in zone (%" PRIu64 ") " + "exceeds max-records (%u)", + records, maxrecords); + result = DNS_R_TOOMANYRECORDS; + goto failure; + } + } + + journalfile = dns_zone_getjournal(zone); + if (journalfile != NULL) { + update_log(client, zone, LOGLEVEL_DEBUG, + "writing journal %s", journalfile); + + journal = NULL; + result = dns_journal_open(mctx, journalfile, + DNS_JOURNAL_CREATE, &journal); + if (result != ISC_R_SUCCESS) { + FAILS(result, "journal open failed"); + } + + result = dns_journal_write_transaction(journal, &diff); + if (result != ISC_R_SUCCESS) { + dns_journal_destroy(&journal); + FAILS(result, "journal write failed"); + } + + dns_journal_destroy(&journal); + } + + /* + * XXXRTH Just a note that this committing code will have + * to change to handle databases that need two-phase + * commit, but this isn't a priority. + */ + update_log(client, zone, LOGLEVEL_DEBUG, + "committing update transaction"); + + dns_db_closeversion(db, &ver, true); + + /* + * Mark the zone as dirty so that it will be written to disk. + */ + dns_zone_markdirty(zone); + + /* + * Notify secondaries of the change we just made. + */ + dns_zone_notify(zone); + + /* + * Cause the zone to be signed with the key that we + * have just added or have the corresponding signatures + * deleted. + * + * Note: we are already committed to this course of action. + */ + for (tuple = ISC_LIST_HEAD(diff.tuples); tuple != NULL; + tuple = ISC_LIST_NEXT(tuple, link)) + { + isc_region_t r; + dns_secalg_t algorithm; + uint16_t keyid; + + if (tuple->rdata.type != dns_rdatatype_dnskey) { + continue; + } + + dns_rdata_tostruct(&tuple->rdata, &dnskey, NULL); + if ((dnskey.flags & + (DNS_KEYFLAG_OWNERMASK | DNS_KEYTYPE_NOAUTH)) != + DNS_KEYOWNER_ZONE) + { + continue; + } + + dns_rdata_toregion(&tuple->rdata, &r); + algorithm = dnskey.algorithm; + keyid = dst_region_computeid(&r); + + result = dns_zone_signwithkey( + zone, algorithm, keyid, + (tuple->op == DNS_DIFFOP_DEL)); + if (result != ISC_R_SUCCESS) { + update_log(client, zone, ISC_LOG_ERROR, + "dns_zone_signwithkey failed: %s", + isc_result_totext(result)); + } + } + + /* + * Cause the zone to add/delete NSEC3 chains for the + * deferred NSEC3PARAM changes. + * + * Note: we are already committed to this course of action. + */ + for (tuple = ISC_LIST_HEAD(diff.tuples); tuple != NULL; + tuple = ISC_LIST_NEXT(tuple, link)) + { + unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE]; + dns_rdata_t rdata = DNS_RDATA_INIT; + dns_rdata_nsec3param_t nsec3param; + + if (tuple->rdata.type != privatetype || + tuple->op != DNS_DIFFOP_ADD) + { + continue; + } + + if (!dns_nsec3param_fromprivate(&tuple->rdata, &rdata, + buf, sizeof(buf))) + { + continue; + } + dns_rdata_tostruct(&rdata, &nsec3param, NULL); + if (nsec3param.flags == 0) { + continue; + } + + result = dns_zone_addnsec3chain(zone, &nsec3param); + if (result != ISC_R_SUCCESS) { + update_log(client, zone, ISC_LOG_ERROR, + "dns_zone_addnsec3chain failed: %s", + isc_result_totext(result)); + } + } + } else { + update_log(client, zone, LOGLEVEL_DEBUG, "redundant request"); + dns_db_closeversion(db, &ver, true); + } + result = ISC_R_SUCCESS; + goto common; + +failure: + /* + * The reason for failure should have been logged at this point. + */ + if (ver != NULL) { + update_log(client, zone, LOGLEVEL_DEBUG, "rolling back"); + dns_db_closeversion(db, &ver, false); + } + +common: + dns_diff_clear(&temp); + dns_diff_clear(&diff); + + if (oldver != NULL) { + dns_db_closeversion(db, &oldver, false); + } + + if (db != NULL) { + dns_db_detach(&db); + } + + if (rules != NULL) { + isc_mem_put(mctx, rules, sizeof(*rules) * ruleslen); + } + + if (ssutable != NULL) { + dns_ssutable_detach(&ssutable); + } + + isc_task_detach(&task); + uev->result = result; + if (zone != NULL) { + INSIST(uev->zone == zone); /* we use this later */ + } + uev->ev_type = DNS_EVENT_UPDATEDONE; + uev->ev_action = updatedone_action; + + isc_task_send(client->task, &event); + + INSIST(ver == NULL); + INSIST(event == NULL); +} + +static void +updatedone_action(isc_task_t *task, isc_event_t *event) { + update_event_t *uev = (update_event_t *)event; + ns_client_t *client = (ns_client_t *)event->ev_arg; + + UNUSED(task); + + REQUIRE(event->ev_type == DNS_EVENT_UPDATEDONE); + REQUIRE(task == client->task); + REQUIRE(client->updatehandle == client->handle); + + INSIST(client->nupdates > 0); + switch (uev->result) { + case ISC_R_SUCCESS: + inc_stats(client, uev->zone, ns_statscounter_updatedone); + break; + case DNS_R_REFUSED: + inc_stats(client, uev->zone, ns_statscounter_updaterej); + break; + default: + inc_stats(client, uev->zone, ns_statscounter_updatefail); + break; + } + if (uev->zone != NULL) { + dns_zone_detach(&uev->zone); + } + + client->nupdates--; + + respond(client, uev->result); + + isc_quota_detach(&(isc_quota_t *){ &client->manager->sctx->updquota }); + isc_event_free(&event); + isc_nmhandle_detach(&client->updatehandle); +} + +/*% + * Update forwarding support. + */ +static void +forward_fail(isc_task_t *task, isc_event_t *event) { + ns_client_t *client = (ns_client_t *)event->ev_arg; + + UNUSED(task); + + INSIST(client->nupdates > 0); + client->nupdates--; + respond(client, DNS_R_SERVFAIL); + + isc_quota_detach(&(isc_quota_t *){ &client->manager->sctx->updquota }); + isc_event_free(&event); + isc_nmhandle_detach(&client->updatehandle); +} + +static void +forward_callback(void *arg, isc_result_t result, dns_message_t *answer) { + update_event_t *uev = arg; + ns_client_t *client = uev->ev_arg; + dns_zone_t *zone = uev->zone; + + if (result != ISC_R_SUCCESS) { + INSIST(answer == NULL); + uev->ev_type = DNS_EVENT_UPDATEDONE; + uev->ev_action = forward_fail; + inc_stats(client, zone, ns_statscounter_updatefwdfail); + } else { + uev->ev_type = DNS_EVENT_UPDATEDONE; + uev->ev_action = forward_done; + uev->answer = answer; + inc_stats(client, zone, ns_statscounter_updaterespfwd); + } + + isc_task_send(client->task, ISC_EVENT_PTR(&uev)); + dns_zone_detach(&zone); +} + +static void +forward_done(isc_task_t *task, isc_event_t *event) { + update_event_t *uev = (update_event_t *)event; + ns_client_t *client = (ns_client_t *)event->ev_arg; + + UNUSED(task); + + INSIST(client->nupdates > 0); + client->nupdates--; + ns_client_sendraw(client, uev->answer); + dns_message_detach(&uev->answer); + + isc_quota_detach(&(isc_quota_t *){ &client->manager->sctx->updquota }); + isc_event_free(&event); + isc_nmhandle_detach(&client->reqhandle); + isc_nmhandle_detach(&client->updatehandle); +} + +static void +forward_action(isc_task_t *task, isc_event_t *event) { + update_event_t *uev = (update_event_t *)event; + dns_zone_t *zone = uev->zone; + ns_client_t *client = (ns_client_t *)event->ev_arg; + isc_result_t result; + + result = dns_zone_forwardupdate(zone, client->message, forward_callback, + event); + if (result != ISC_R_SUCCESS) { + uev->ev_type = DNS_EVENT_UPDATEDONE; + uev->ev_action = forward_fail; + isc_task_send(client->task, &event); + inc_stats(client, zone, ns_statscounter_updatefwdfail); + dns_zone_detach(&zone); + } else { + inc_stats(client, zone, ns_statscounter_updatereqfwd); + } + + isc_task_detach(&task); +} + +static isc_result_t +send_forward_event(ns_client_t *client, dns_zone_t *zone) { + char namebuf[DNS_NAME_FORMATSIZE]; + char classbuf[DNS_RDATACLASS_FORMATSIZE]; + isc_result_t result = ISC_R_SUCCESS; + update_event_t *event = NULL; + isc_task_t *zonetask = NULL; + + result = checkupdateacl(client, dns_zone_getforwardacl(zone), + "update forwarding", dns_zone_getorigin(zone), + true, false); + if (result != ISC_R_SUCCESS) { + return (result); + } + + result = isc_quota_attach(&client->manager->sctx->updquota, + &(isc_quota_t *){ NULL }); + if (result != ISC_R_SUCCESS) { + update_log(client, zone, LOGLEVEL_PROTOCOL, + "update failed: too many DNS UPDATEs queued (%s)", + isc_result_totext(result)); + ns_stats_increment(client->manager->sctx->nsstats, + ns_statscounter_updatequota); + return (DNS_R_DROP); + } + + event = (update_event_t *)isc_event_allocate( + client->mctx, client, DNS_EVENT_UPDATE, forward_action, NULL, + sizeof(*event)); + event->zone = zone; + event->result = ISC_R_SUCCESS; + + INSIST(client->nupdates == 0); + client->nupdates++; + event->ev_arg = client; + + dns_name_format(dns_zone_getorigin(zone), namebuf, sizeof(namebuf)); + dns_rdataclass_format(dns_zone_getclass(zone), classbuf, + sizeof(classbuf)); + + ns_client_log(client, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE, + LOGLEVEL_PROTOCOL, "forwarding update for zone '%s/%s'", + namebuf, classbuf); + + dns_zone_gettask(zone, &zonetask); + isc_nmhandle_attach(client->handle, &client->updatehandle); + isc_task_send(zonetask, ISC_EVENT_PTR(&event)); + + if (event != NULL) { + isc_event_free(ISC_EVENT_PTR(&event)); + } + return (result); +} |