dns/bind9
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bind9/lib/ns/update.c
alessio 2f27d66450 Refactor to use list-like macro for message sections 
In the code base it is very common to iterate over all names in a message
section and all rdatasets for each name, but various idioms are used for
iteration.

This commit standardizes them as much as possible to a single idiom,
using the macro MSG_SECTION_FOREACH, similar to the existing
ISC_LIST_FOREACH.
2025-03-27 03:09:46 +01:00

3575 lines
97 KiB
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/*
* 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/async.h>
#include <isc/log.h>
#include <isc/netaddr.h>
#include <isc/serial.h>
#include <isc/stats.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/diff.h>
#include <dns/dnssec.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/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(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(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 update_t;
struct update {
dns_zone_t *zone;
ns_client_t *client;
isc_result_t result;
dns_message_t *answer;
unsigned int *maxbytype;
size_t maxbytypelen;
};
/*%
* 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(void *arg);
static void
updatedone_action(void *arg);
static isc_result_t
send_forward(ns_client_t *client, dns_zone_t *zone);
static void
forward_done(void *arg);
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(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->manager->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;
dns_difftuple_create(diff->mctx, op, name, ttl, rdata, &tuple);
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 void
temp_append(dns_diff_t *diff, dns_name_t *name, dns_rdata_t *rdata) {
dns_difftuple_t *tuple = NULL;
REQUIRE(DNS_DIFF_VALID(diff));
dns_difftuple_create(diff->mctx, DNS_DIFFOP_EXISTS, name, 0, rdata,
&tuple);
ISC_LIST_APPEND(diff->tuples, tuple, link);
}
/*%
* 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 (dns_rdatatype_issig(type)) {
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);
temp_append(&d_rrs, name, &rdata);
}
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) {
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)) {
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) {
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) {
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);
}
}
return ISC_R_SUCCESS;
}
/**************************************************************************/
/*
* 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_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;
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));
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(ns_client_t *client, dns_zone_t *zone) {
isc_result_t result = ISC_R_SUCCESS;
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;
unsigned int *maxbytype = NULL;
size_t update = 0, maxbytypelen = 0;
dns_zoneopt_t options;
dns_db_t *db = NULL;
dns_dbversion_t *ver = NULL;
update_t *uev = NULL;
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);
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) {
maxbytypelen = request->counts[DNS_SECTION_UPDATE];
maxbytype = isc_mem_cget(mctx, maxbytypelen,
sizeof(*maxbytype));
}
update = 0;
MSG_SECTION_FOREACH (request, DNS_SECTION_UPDATE, name) {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
INSIST(ssutable == NULL || update < maxbytypelen);
get_current_rr(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);
}
if ((options & DNS_ZONEOPT_CHECKSVCB) != 0 &&
rdata.type == dns_rdatatype_svcb)
{
result = dns_rdata_checksvcb(name, &rdata);
if (result != ISC_R_SUCCESS) {
const char *reason =
isc_result_totext(result);
FAILNT(DNS_R_REFUSED, name, rdata.type,
reason);
}
}
} 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;
maxbytype[update] = 0;
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, NULL))
{
FAILC(DNS_R_REFUSED,
"rejected by secure update");
}
} else if (rdata.type != dns_rdatatype_any) {
const dns_ssurule_t *ssurule = NULL;
if (!dns_ssutable_checkrules(
ssutable, client->signer, name,
&netaddr, TCPCLIENT(client), env,
rdata.type, target, tsigkey,
&ssurule))
{
FAILC(DNS_R_REFUSED,
"rejected by secure update");
}
maxbytype[update] = dns_ssurule_max(ssurule,
rdata.type);
} else {
if (!ssu_checkall(db, ver, name, ssutable,
client->signer, &netaddr, env,
TCPCLIENT(client), tsigkey))
{
FAILC(DNS_R_REFUSED,
"rejected by secure update");
}
}
}
update++;
}
update_log(client, zone, LOGLEVEL_DEBUG, "update section prescan OK");
result = isc_quota_acquire(&client->manager->sctx->updquota);
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);
}
uev = isc_mem_get(client->manager->mctx, sizeof(*uev));
*uev = (update_t){
.zone = zone,
.client = client,
.maxbytype = maxbytype,
.maxbytypelen = maxbytypelen,
.result = ISC_R_SUCCESS,
};
isc_nmhandle_attach(client->handle, &client->updatehandle);
isc_async_run(dns_zone_getloop(zone), update_action, uev);
maxbytype = NULL;
failure:
if (db != NULL) {
dns_db_closeversion(db, &ver, false);
dns_db_detach(&db);
}
if (maxbytype != NULL) {
isc_mem_cput(mctx, maxbytype, maxbytypelen, sizeof(*maxbytype));
}
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_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.
*/
if (ISC_LIST_EMPTY(request->sections[DNS_SECTION_ZONE])) {
FAILC(DNS_R_FORMERR, "update zone section empty");
}
/*
* The zone section must contain exactly one "question", and
* it must be of type SOA.
*/
zonename = ISC_LIST_HEAD(request->sections[DNS_SECTION_ZONE]);
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. */
if (ISC_LIST_NEXT(zonename, link) != NULL) {
FAILC(DNS_R_FORMERR,
"update zone section contains multiple RRs");
}
result = dns_view_findzone(client->view, zonename, DNS_ZTFIND_EXACT,
&zone);
if (result != ISC_R_SUCCESS) {
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(client, zone));
break;
case dns_zone_secondary:
case dns_zone_mirror:
dns_message_clonebuffer(client->message);
CHECK(send_forward(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 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;
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) {
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) {
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);
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) {
dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
0, &rdata, &newtuple);
CHECK(do_one_tuple(&newtuple, db, ver, diff));
}
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;
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;
}
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(void *arg) {
update_t *uev = (update_t *)arg;
dns_zone_t *zone = uev->zone;
ns_client_t *client = uev->client;
unsigned int *maxbytype = uev->maxbytype;
size_t update = 0, maxbytypelen = uev->maxbytypelen;
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->manager->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;
bool had_dnskey;
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
dns_ttl_t maxttl = 0;
uint32_t maxrecords;
uint64_t records;
bool is_inline, is_maintain, is_signing;
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);
is_inline = (!dns_zone_israw(zone) && dns_zone_issecure(zone));
is_maintain = ((dns_zone_getkeyopts(zone) & DNS_ZONEKEY_MAINTAIN) != 0);
is_signing = is_inline || (!is_inline && is_maintain);
/*
* Get old and new versions now that queryacl has been checked.
*/
dns_db_currentversion(db, &oldver);
CHECK(dns_db_newversion(db, &ver));
/*
* Check prerequisites.
*/
MSG_SECTION_FOREACH (request, DNS_SECTION_PREREQUISITE, name) {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
bool flag;
get_current_rr(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;" */
temp_append(&temp, name, &rdata);
} else {
PREREQFAILC(DNS_R_FORMERR, "malformed prerequisite");
}
}
/*
* 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 || maxbytype != NULL);
update = 0;
MSG_SECTION_FOREACH (request, DNS_SECTION_UPDATE, name) {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
dns_rdataclass_t update_class;
bool flag;
INSIST(ssutable == NULL || update < maxbytypelen);
get_current_rr(zoneclass, name, &rdata, &covers, &ttl,
&update_class);
if (update_class == zoneclass) {
/*
* 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 (maxbytype != NULL && maxbytype[update] != 0) {
unsigned int count = 0;
CHECK(foreach_rr(db, ver, name, rdata.type,
covers, count_action, &count));
if (count >= maxbytype[update]) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to add more "
"records than permitted by "
"policy max=%u",
maxbytype[update]);
continue;
}
}
if (isc_log_wouldlog(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;
}
result = update_one_rr(
db, ver, &diff, DNS_DIFFOP_ADD,
name, ttl, &rdata);
if (result != ISC_R_SUCCESS) {
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"adding an RR "
"failed: %s",
isc_result_totext(
result));
goto failure;
}
}
}
} else if (update_class == dns_rdataclass_any) {
if (rdata.type == dns_rdatatype_any) {
if (isc_log_wouldlog(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(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;
}
}
/*
* Don't remove DNSKEY, CDNSKEY, CDS records
* that are in use (under our control).
*/
if (dns_rdatatype_iskeymaterial(rdata.type)) {
isc_result_t r;
bool inuse = false;
r = dns_zone_dnskey_inuse(zone, &rdata,
&inuse);
if (r != ISC_R_SUCCESS) {
FAIL(r);
}
if (inuse) {
char typebuf
[DNS_RDATATYPE_FORMATSIZE];
dns_rdatatype_format(
rdata.type, typebuf,
sizeof(typebuf));
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to delete "
"in use %s ignored",
typebuf);
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));
}
++update;
}
/*
* 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) && is_signing) {
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));
CHECK(rrset_exists(db, oldver, zonename, dns_rdatatype_dnskey,
0, &had_dnskey));
CHECK(rollback_private(db, privatetype, ver, &diff));
CHECK(add_nsec3param_records(client, zone, db, ver, &diff));
if (is_signing && 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);
} 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 (maxbytype != NULL) {
isc_mem_cput(mctx, maxbytype, maxbytypelen, sizeof(*maxbytype));
}
if (ssutable != NULL) {
dns_ssutable_detach(&ssutable);
}
uev->result = result;
if (zone != NULL) {
INSIST(uev->zone == zone); /* we use this later */
}
isc_async_run(client->manager->loop, updatedone_action, uev);
INSIST(ver == NULL);
}
static void
updatedone_action(void *arg) {
update_t *uev = (update_t *)arg;
ns_client_t *client = uev->client;
REQUIRE(client->updatehandle == client->handle);
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;
}
respond(client, uev->result);
isc_quota_release(&client->manager->sctx->updquota);
if (uev->zone != NULL) {
dns_zone_detach(&uev->zone);
}
isc_mem_put(client->manager->mctx, uev, sizeof(*uev));
isc_nmhandle_detach(&client->updatehandle);
}
/*%
* Update forwarding support.
*/
static void
forward_fail(void *arg) {
update_t *uev = (update_t *)arg;
ns_client_t *client = uev->client;
respond(client, DNS_R_SERVFAIL);
isc_quota_release(&client->manager->sctx->updquota);
isc_mem_put(client->manager->mctx, uev, sizeof(*uev));
isc_nmhandle_detach(&client->updatehandle);
}
static void
forward_callback(void *arg, isc_result_t result, dns_message_t *answer) {
update_t *uev = (update_t *)arg;
ns_client_t *client = uev->client;
dns_zone_t *zone = uev->zone;
if (result != ISC_R_SUCCESS) {
INSIST(answer == NULL);
inc_stats(client, zone, ns_statscounter_updatefwdfail);
isc_async_run(client->manager->loop, forward_fail, uev);
} else {
uev->answer = answer;
inc_stats(client, zone, ns_statscounter_updaterespfwd);
isc_async_run(client->manager->loop, forward_done, uev);
}
dns_zone_detach(&zone);
}
static void
forward_done(void *arg) {
update_t *uev = (update_t *)arg;
ns_client_t *client = uev->client;
ns_client_sendraw(client, uev->answer);
dns_message_detach(&uev->answer);
isc_quota_release(&client->manager->sctx->updquota);
isc_mem_put(client->manager->mctx, uev, sizeof(*uev));
isc_nmhandle_detach(&client->reqhandle);
isc_nmhandle_detach(&client->updatehandle);
}
static void
forward_action(void *arg) {
update_t *uev = (update_t *)arg;
dns_zone_t *zone = uev->zone;
ns_client_t *client = uev->client;
isc_result_t result;
result = dns_zone_forwardupdate(zone, client->message, forward_callback,
uev);
if (result != ISC_R_SUCCESS) {
isc_async_run(client->manager->loop, forward_fail, uev);
inc_stats(client, zone, ns_statscounter_updatefwdfail);
dns_zone_detach(&zone);
} else {
inc_stats(client, zone, ns_statscounter_updatereqfwd);
}
}
static isc_result_t
send_forward(ns_client_t *client, dns_zone_t *zone) {
isc_result_t result = ISC_R_SUCCESS;
char namebuf[DNS_NAME_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
update_t *uev = 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_acquire(&client->manager->sctx->updquota);
if (result != ISC_R_SUCCESS) {
if (result == ISC_R_SOFTQUOTA) {
isc_quota_release(&client->manager->sctx->updquota);
}
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;
}
uev = isc_mem_get(client->manager->mctx, sizeof(*uev));
*uev = (update_t){
.zone = zone,
.client = client,
.result = ISC_R_SUCCESS,
};
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);
isc_nmhandle_attach(client->handle, &client->updatehandle);
isc_async_run(dns_zone_getloop(zone), forward_action, uev);
return result;
}
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