update.c revision b08325a7f3092cca1131e1a04a43a4ecef713e29
/*
* Copyright (C) 2004-2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: update.c,v 1.169 2009/11/18 21:22:31 each Exp $ */
#include <config.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/soa.h>
#include <dns/ssu.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/client.h>
#include <named/log.h>
#include <named/server.h>
#include <named/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"; \
} \
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(zone, dns_nsstatscounter_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"; \
} \
if (isc_log_wouldlog(ns_g_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(zone, dns_nsstatscounter_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"; \
} \
if (isc_log_wouldlog(ns_g_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(zone, dns_nsstatscounter_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; */
isc_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;
};
/**************************************************************************/
/*
* 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 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 || zone == NULL)
return;
if (isc_log_wouldlog(ns_g_lctx, level) == ISC_FALSE)
return;
dns_name_format(dns_zone_getorigin(zone), namebuf,
sizeof(namebuf));
dns_rdataclass_format(dns_zone_getclass(zone), classbuf,
sizeof(classbuf));
va_start(ap, fmt);
vsnprintf(message, sizeof(message), fmt, ap);
va_end(ap);
ns_client_log(client, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE,
level, "updating zone '%s/%s': %s",
namebuf, classbuf, message);
}
/*%
* Increment updated-related statistics counters.
*/
static inline void
inc_stats(dns_zone_t *zone, isc_statscounter_t counter) {
isc_stats_increment(ns_g_server->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)
{
char namebuf[DNS_NAME_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
int level;
isc_result_t result;
result = ns_client_checkaclsilent(client, NULL, queryacl, ISC_TRUE);
if (result != ISC_R_SUCCESS) {
dns_name_format(zonename, namebuf, sizeof(namebuf));
dns_rdataclass_format(client->view->rdclass, classbuf,
sizeof(classbuf));
level = (updateacl == NULL && ssutable == NULL) ?
ISC_LOG_INFO : ISC_LOG_ERROR;
ns_client_log(client, NS_LOGCATEGORY_UPDATE_SECURITY,
NS_LOGMODULE_UPDATE, level,
"update '%s/%s' denied due to allow-query",
namebuf, classbuf);
} else if (updateacl == NULL && ssutable == NULL) {
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
* master based on IP address.
*
* 'message' contains the type of operation that is being attempted.
* 'slave' indicates if this is a slave zone. If 'acl' is NULL then
* log at debug=3.
* If the zone has no access controls configured ('acl' == NULL &&
* 'has_ssutable == ISC_FALS) log the attempt at info, otherwise
* at error.
*
* 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, isc_boolean_t slave,
isc_boolean_t 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 (slave && acl == NULL) {
result = DNS_R_NOTIMP;
level = ISC_LOG_DEBUG(3);
msg = "disabled";
} else {
result = ns_client_checkaclsilent(client, NULL, acl, ISC_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);
temp_diff.resign = diff->resign;
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;
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &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,
(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;
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, ISC_FALSE, &node);
else
result = dns_db_findnode(db, name, ISC_FALSE, &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;
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 isc_boolean_t rr_predicate(dns_rdata_t *update_rr, dns_rdata_t *db_rr);
/*%
* 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 ISC_TRUE or ISC_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 = ISC_TRUE, ISC_R_SUCCESS) : \
((result == ISC_R_SUCCESS) ? \
(*exists = ISC_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,
isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rr(db, ver, name, type, covers,
rrset_exists_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*%
* Set '*visible' to true if the RRset exists and is part of the
* visible zone. Otherwise '*visible' is set to false unless a
* error occurs.
*/
static isc_result_t
rrset_visible(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_rdatatype_t type, isc_boolean_t *visible)
{
isc_result_t result;
dns_fixedname_t fixed;
dns_fixedname_init(&fixed);
result = dns_db_find(db, name, ver, type, DNS_DBFIND_NOWILD,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&fixed), NULL, NULL);
switch (result) {
case ISC_R_SUCCESS:
*visible = ISC_TRUE;
break;
/*
* Glue, obscured, deleted or replaced records.
*/
case DNS_R_DELEGATION:
case DNS_R_DNAME:
case DNS_R_CNAME:
case DNS_R_NXDOMAIN:
case DNS_R_NXRRSET:
case DNS_R_EMPTYNAME:
case DNS_R_COVERINGNSEC:
*visible = ISC_FALSE;
result = ISC_R_SUCCESS;
break;
default:
break;
}
return (result);
}
/*%
* 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_isdnssec(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 ISC_TRUE.
* Otherwise, set it to ISC_FALSE.
*/
static isc_result_t
cname_incompatible_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, isc_boolean_t *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,
isc_boolean_t *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 if the request was received via TCP. */
isc_netaddr_t *tcpaddr;
/* The ssu table to check against. */
dns_ssutable_t *table;
} ssu_check_t;
static isc_result_t
ssu_checkrule(void *data, dns_rdataset_t *rrset) {
ssu_check_t *ssuinfo = data;
isc_boolean_t result;
/*
* 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);
result = dns_ssutable_checkrules(ssuinfo->table, ssuinfo->signer,
ssuinfo->name, ssuinfo->tcpaddr,
rrset->type);
return (result == ISC_TRUE ? ISC_R_SUCCESS : ISC_R_FAILURE);
}
static isc_boolean_t
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 *tcpaddr)
{
isc_result_t result;
ssu_check_t ssuinfo;
ssuinfo.name = name;
ssuinfo.table = ssutable;
ssuinfo.signer = signer;
ssuinfo.tcpaddr = tcpaddr;
result = foreach_rrset(db, ver, name, ssu_checkrule, &ssuinfo);
return (ISC_TF(result == ISC_R_SUCCESS));
}
/**************************************************************************/
/*
* 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_compare(&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_compare(&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;
(void)dns_name_copy(name, tmpname, NULL);
*typep = t->rdata.type;
/* A new unique name begins here. */
node = NULL;
result = dns_db_findnode(db, name, ISC_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 isc_boolean_t
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) ?
ISC_TRUE : ISC_FALSE);
}
/*%
* Return true iff 'db_rr' is neither a RRSIG nor a NSEC.
*/
static isc_boolean_t
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) ?
ISC_TRUE : ISC_FALSE);
}
/*%
* Return true always.
*/
static isc_boolean_t
true_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
UNUSED(db_rr);
return (ISC_TRUE);
}
/*%
* Return true if the record is a RRSIG.
*/
static isc_boolean_t
rrsig_p(dns_rdata_t *update_rr, dns_rdata_t *db_rr) {
UNUSED(update_rr);
return ((db_rr->type == dns_rdatatype_rrsig) ?
ISC_TRUE : ISC_FALSE);
}
/*%
* Return true iff the two RRs have identical rdata.
*/
static isc_boolean_t
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_compare(update_rr, db_rr) == 0 ?
ISC_TRUE : ISC_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 isc_boolean_t
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 (ISC_FALSE);
if (db_rr->type == dns_rdatatype_cname)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_dname)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_soa)
return (ISC_TRUE);
if (db_rr->type == dns_rdatatype_nsec)
return (ISC_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 (ISC_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 ?
ISC_TRUE : ISC_FALSE);
}
if (db_rr->type == dns_rdatatype_nsec3param) {
if (db_rr->length != update_rr->length)
return (ISC_FALSE);
INSIST(db_rr->length >= 4 && update_rr->length >= 4);
/*
* Replace records added in this UPDATE request.
*/
if (db_rr->data[0] == update_rr->data[0] &&
(db_rr->data[1] & DNS_NSEC3FLAG_UPDATE) != 0 &&
(update_rr->data[1] & DNS_NSEC3FLAG_UPDATE) != 0 &&
memcmp(db_rr->data+2, update_rr->data+2,
update_rr->length - 2) == 0)
return (ISC_TRUE);
}
return (ISC_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));
}
/**************************************************************************/
/*%
* 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_rdata_t *update_rr;
dns_ttl_t update_rr_ttl;
isc_boolean_t ignore_add;
dns_diff_t del_diff;
dns_diff_t add_diff;
} add_rr_prepare_ctx_t;
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;
isc_boolean_t equal;
/*
* If the update RR is a "duplicate" of the update RR,
* the update should be silently ignored.
*/
equal = ISC_TF(dns_rdata_compare(&rr->rdata, ctx->update_rr) == 0);
if (equal && rr->ttl == ctx->update_rr_ttl) {
ctx->ignore_add = ISC_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->name, rr->ttl, &rr->rdata,
&tuple));
dns_diff_append(&ctx->del_diff, &tuple);
return (ISC_R_SUCCESS);
}
/*
* If this RR differs in TTL from the update RR,
* its TTL must be adjusted.
*/
if (rr->ttl != ctx->update_rr_ttl) {
CHECK(dns_difftuple_create(ctx->del_diff.mctx, DNS_DIFFOP_DEL,
ctx->name, 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
increment_soa_serial(dns_db_t *db, dns_dbversion_t *ver,
dns_diff_t *diff, isc_mem_t *mctx)
{
dns_difftuple_t *deltuple = NULL;
dns_difftuple_t *addtuple = NULL;
isc_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);
/* RFC1982 */
serial = (serial + 1) & 0xFFFFFFFF;
if (serial == 0)
serial = 1;
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 ISC_TRUE if the update is legal, ISC_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, isc_boolean_t *ok)
{
isc_uint32_t db_serial;
isc_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 = ISC_FALSE;
} else {
*ok = ISC_TRUE;
}
return (ISC_R_SUCCESS);
}
/**************************************************************************/
/*
* Incremental updating of NSECs and RRSIGs.
*/
#define MAXZONEKEYS 32 /*%< Maximum number of zone keys supported. */
/*%
* We abuse the dns_diff_t type to represent a set of domain names
* affected by the update.
*/
static isc_result_t
namelist_append_name(dns_diff_t *list, dns_name_t *name) {
isc_result_t result;
dns_difftuple_t *tuple = NULL;
static dns_rdata_t dummy_rdata = DNS_RDATA_INIT;
CHECK(dns_difftuple_create(list->mctx, DNS_DIFFOP_EXISTS, name, 0,
&dummy_rdata, &tuple));
dns_diff_append(list, &tuple);
failure:
return (result);
}
static isc_result_t
namelist_append_subdomain(dns_db_t *db, dns_name_t *name, dns_diff_t *affected)
{
isc_result_t result;
dns_fixedname_t fixedname;
dns_name_t *child;
dns_dbiterator_t *dbit = NULL;
dns_fixedname_init(&fixedname);
child = dns_fixedname_name(&fixedname);
CHECK(dns_db_createiterator(db, DNS_DB_NONSEC3, &dbit));
for (result = dns_dbiterator_seek(dbit, name);
result == ISC_R_SUCCESS;
result = dns_dbiterator_next(dbit))
{
dns_dbnode_t *node = NULL;
CHECK(dns_dbiterator_current(dbit, &node, child));
dns_db_detachnode(db, &node);
if (! dns_name_issubdomain(child, name))
break;
CHECK(namelist_append_name(affected, child));
}
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*%
* Helper function for non_nsec_rrset_exists().
*/
static isc_result_t
is_non_nsec_action(void *data, dns_rdataset_t *rrset) {
UNUSED(data);
if (!(rrset->type == dns_rdatatype_nsec ||
rrset->type == dns_rdatatype_nsec3 ||
(rrset->type == dns_rdatatype_rrsig &&
(rrset->covers == dns_rdatatype_nsec ||
rrset->covers == dns_rdatatype_nsec3))))
return (ISC_R_EXISTS);
return (ISC_R_SUCCESS);
}
/*%
* Check whether there is an rrset other than a NSEC or RRSIG NSEC,
* i.e., anything that justifies the continued existence of a name
* after a secure update.
*
* If such an rrset exists, set '*exists' to ISC_TRUE.
* Otherwise, set it to ISC_FALSE.
*/
static isc_result_t
non_nsec_rrset_exists(dns_db_t *db, dns_dbversion_t *ver,
dns_name_t *name, isc_boolean_t *exists)
{
isc_result_t result;
result = foreach_rrset(db, ver, name, is_non_nsec_action, NULL);
RETURN_EXISTENCE_FLAG;
}
/*%
* A comparison function for sorting dns_diff_t:s by name.
*/
static int
name_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;
return (dns_name_compare(&a->name, &b->name));
}
static isc_result_t
uniqify_name_list(dns_diff_t *list) {
isc_result_t result;
dns_difftuple_t *p, *q;
CHECK(dns_diff_sort(list, name_order));
p = ISC_LIST_HEAD(list->tuples);
while (p != NULL) {
do {
q = ISC_LIST_NEXT(p, link);
if (q == NULL || ! dns_name_equal(&p->name, &q->name))
break;
ISC_LIST_UNLINK(list->tuples, q, link);
dns_difftuple_free(&q);
} while (1);
p = ISC_LIST_NEXT(p, link);
}
failure:
return (result);
}
static isc_result_t
is_active(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
isc_boolean_t *flag, isc_boolean_t *cut, isc_boolean_t *unsecure)
{
isc_result_t result;
dns_fixedname_t foundname;
dns_fixedname_init(&foundname);
result = dns_db_find(db, name, ver, dns_rdatatype_any,
DNS_DBFIND_GLUEOK | DNS_DBFIND_NOWILD,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&foundname),
NULL, NULL);
if (result == ISC_R_SUCCESS || result == DNS_R_EMPTYNAME) {
*flag = ISC_TRUE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (ISC_R_SUCCESS);
} else if (result == DNS_R_ZONECUT) {
*flag = ISC_TRUE;
*cut = ISC_TRUE;
if (unsecure != NULL) {
/*
* We are at the zonecut. Check to see if there
* is a DS RRset.
*/
if (dns_db_find(db, name, ver, dns_rdatatype_ds, 0,
(isc_stdtime_t) 0, NULL,
dns_fixedname_name(&foundname),
NULL, NULL) == DNS_R_NXRRSET)
*unsecure = ISC_TRUE;
else
*unsecure = ISC_FALSE;
}
return (ISC_R_SUCCESS);
} else if (result == DNS_R_GLUE || result == DNS_R_DNAME ||
result == DNS_R_DELEGATION || result == DNS_R_NXDOMAIN) {
*flag = ISC_FALSE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (ISC_R_SUCCESS);
} else {
/*
* Silence compiler.
*/
*flag = ISC_FALSE;
*cut = ISC_FALSE;
if (unsecure != NULL)
*unsecure = ISC_FALSE;
return (result);
}
}
/*%
* Find the next/previous name that has a NSEC record.
* In other words, skip empty database nodes and names that
* have had their NSECs removed because they are obscured by
* a zone cut.
*/
static isc_result_t
next_active(ns_client_t *client, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *oldname, dns_name_t *newname,
isc_boolean_t forward)
{
isc_result_t result;
dns_dbiterator_t *dbit = NULL;
isc_boolean_t has_nsec;
unsigned int wraps = 0;
isc_boolean_t secure = dns_db_issecure(db);
CHECK(dns_db_createiterator(db, 0, &dbit));
CHECK(dns_dbiterator_seek(dbit, oldname));
do {
dns_dbnode_t *node = NULL;
if (forward)
result = dns_dbiterator_next(dbit);
else
result = dns_dbiterator_prev(dbit);
if (result == ISC_R_NOMORE) {
/*
* Wrap around.
*/
if (forward)
CHECK(dns_dbiterator_first(dbit));
else
CHECK(dns_dbiterator_last(dbit));
wraps++;
if (wraps == 2) {
update_log(client, zone, ISC_LOG_ERROR,
"secure zone with no NSECs");
result = DNS_R_BADZONE;
goto failure;
}
}
CHECK(dns_dbiterator_current(dbit, &node, newname));
dns_db_detachnode(db, &node);
/*
* The iterator may hold the tree lock, and
* rrset_exists() calls dns_db_findnode() which
* may try to reacquire it. To avoid deadlock
* we must pause the iterator first.
*/
CHECK(dns_dbiterator_pause(dbit));
if (secure) {
CHECK(rrset_exists(db, ver, newname,
dns_rdatatype_nsec, 0, &has_nsec));
} else {
dns_fixedname_t ffound;
dns_name_t *found;
dns_fixedname_init(&ffound);
found = dns_fixedname_name(&ffound);
result = dns_db_find(db, newname, ver,
dns_rdatatype_soa,
DNS_DBFIND_NOWILD, 0, NULL, found,
NULL, NULL);
if (result == ISC_R_SUCCESS ||
result == DNS_R_EMPTYNAME ||
result == DNS_R_NXRRSET ||
result == DNS_R_CNAME ||
(result == DNS_R_DELEGATION &&
dns_name_equal(newname, found))) {
has_nsec = ISC_TRUE;
result = ISC_R_SUCCESS;
} else if (result != DNS_R_NXDOMAIN)
break;
}
} while (! has_nsec);
failure:
if (dbit != NULL)
dns_dbiterator_destroy(&dbit);
return (result);
}
/*%
* Add a NSEC record for "name", recording the change in "diff".
* The existing NSEC is removed.
*/
static isc_result_t
add_nsec(ns_client_t *client, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, dns_ttl_t nsecttl,
dns_diff_t *diff)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
unsigned char buffer[DNS_NSEC_BUFFERSIZE];
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_difftuple_t *tuple = NULL;
dns_fixedname_t fixedname;
dns_name_t *target;
dns_fixedname_init(&fixedname);
target = dns_fixedname_name(&fixedname);
/*
* Find the successor name, aka NSEC target.
*/
CHECK(next_active(client, zone, db, ver, name, target, ISC_TRUE));
/*
* Create the NSEC RDATA.
*/
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
dns_rdata_init(&rdata);
CHECK(dns_nsec_buildrdata(db, ver, node, target, buffer, &rdata));
dns_db_detachnode(db, &node);
/*
* Delete the old NSEC and record the change.
*/
CHECK(delete_if(true_p, db, ver, name, dns_rdatatype_nsec, 0,
NULL, diff));
/*
* Add the new NSEC and record the change.
*/
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
nsecttl, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*%
* Add a placeholder NSEC record for "name", recording the change in "diff".
*/
static isc_result_t
add_placeholder_nsec(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_diff_t *diff)
{
isc_result_t result;
dns_difftuple_t *tuple = NULL;
isc_region_t r;
unsigned char data[1] = { 0 }; /* The root domain, no bits. */
dns_rdata_t rdata = DNS_RDATA_INIT;
r.base = data;
r.length = sizeof(data);
dns_rdata_fromregion(&rdata, dns_db_class(db), dns_rdatatype_nsec, &r);
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name, 0,
&rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
failure:
return (result);
}
static isc_result_t
find_zone_keys(dns_zone_t *zone, dns_db_t *db, dns_dbversion_t *ver,
isc_mem_t *mctx, unsigned int maxkeys,
dst_key_t **keys, unsigned int *nkeys)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
const char *directory = dns_zone_getkeydirectory(zone);
CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
CHECK(dns_dnssec_findzonekeys2(db, ver, node, dns_db_origin(db),
directory, mctx, maxkeys, keys, nkeys));
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*%
* Add RRSIG records for an RRset, recording the change in "diff".
*/
static isc_result_t
add_sigs(ns_client_t *client, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, dns_rdatatype_t type,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys,
isc_stdtime_t inception, isc_stdtime_t expire,
isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t sig_rdata = DNS_RDATA_INIT;
isc_buffer_t buffer;
unsigned char data[1024]; /* XXX */
unsigned int i, j;
isc_boolean_t added_sig = ISC_FALSE;
isc_mem_t *mctx = client->mctx;
dns_rdataset_init(&rdataset);
isc_buffer_init(&buffer, data, sizeof(data));
/* Get the rdataset to sign. */
if (type == dns_rdatatype_nsec3)
CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node));
else
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
CHECK(dns_db_findrdataset(db, node, ver, type, 0,
(isc_stdtime_t) 0, &rdataset, NULL));
dns_db_detachnode(db, &node);
#define REVOKE(x) ((dst_key_flags(x) & DNS_KEYFLAG_REVOKE) == 1)
#define KSK(x) ((dst_key_flags(x) & DNS_KEYFLAG_KSK) == 1)
#define ALG(x) dst_key_alg(x)
/*
* If we are honoring KSK flags then we need to check that we
* have both KSK and non-KSK keys that are not revoked per
* algorithm.
*/
for (i = 0; i < nkeys; i++) {
isc_boolean_t both = ISC_FALSE;
if (!dst_key_isprivate(keys[i]))
continue;
if (check_ksk && !REVOKE(keys[i])) {
isc_boolean_t have_ksk, have_nonksk;
if (KSK(keys[i])) {
have_ksk = ISC_TRUE;
have_nonksk = ISC_FALSE;
} else {
have_ksk = ISC_FALSE;
have_nonksk = ISC_TRUE;
}
for (j = 0; j < nkeys; j++) {
if (j == i || ALG(keys[i]) != ALG(keys[j]))
continue;
if (REVOKE(keys[j]))
continue;
if (KSK(keys[j]))
have_ksk = ISC_TRUE;
else
have_nonksk = ISC_TRUE;
both = have_ksk && have_nonksk;
if (both)
break;
}
}
if (both) {
if (type == dns_rdatatype_dnskey) {
if (!KSK(keys[i]) && keyset_kskonly)
continue;
} else if (KSK(keys[i]))
continue;
} else if (REVOKE(keys[i]) && type != dns_rdatatype_dnskey)
continue;
/* Calculate the signature, creating a RRSIG RDATA. */
CHECK(dns_dnssec_sign(name, &rdataset, keys[i],
&inception, &expire,
mctx, &buffer, &sig_rdata));
/* Update the database and journal with the RRSIG. */
/* XXX inefficient - will cause dataset merging */
CHECK(update_one_rr(db, ver, diff, DNS_DIFFOP_ADDRESIGN, name,
rdataset.ttl, &sig_rdata));
dns_rdata_reset(&sig_rdata);
added_sig = ISC_TRUE;
}
if (!added_sig) {
update_log(client, zone, ISC_LOG_ERROR,
"found no private keys, "
"unable to generate any signatures");
result = ISC_R_NOTFOUND;
}
failure:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
/*
* Delete expired RRsigs and any RRsigs we are about to re-sign.
* See also zone.c:del_sigs().
*/
static isc_result_t
del_keysigs(dns_db_t *db, dns_dbversion_t *ver, dns_name_t *name,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_rdataset_t rdataset;
dns_rdata_t rdata = DNS_RDATA_INIT;
unsigned int i;
dns_rdata_rrsig_t rrsig;
isc_boolean_t found;
dns_rdataset_init(&rdataset);
result = dns_db_findnode(db, name, ISC_FALSE, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_db_findrdataset(db, node, ver, dns_rdatatype_rrsig,
dns_rdatatype_dnskey, (isc_stdtime_t) 0,
&rdataset, NULL);
dns_db_detachnode(db, &node);
if (result == ISC_R_NOTFOUND)
return (ISC_R_SUCCESS);
if (result != ISC_R_SUCCESS)
goto failure;
for (result = dns_rdataset_first(&rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&rdataset)) {
dns_rdataset_current(&rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
found = ISC_FALSE;
for (i = 0; i < nkeys; i++) {
if (rrsig.keyid == dst_key_id(keys[i])) {
found = ISC_TRUE;
if (!dst_key_isprivate(keys[i])) {
/*
* The re-signing code in zone.c
* will mark this as offline.
* Just skip the record for now.
*/
break;
}
result = update_one_rr(db, ver, diff,
DNS_DIFFOP_DEL, name,
rdataset.ttl, &rdata);
break;
}
}
/*
* If there is not a matching DNSKEY then delete the RRSIG.
*/
if (!found)
result = update_one_rr(db, ver, diff, DNS_DIFFOP_DEL,
name, rdataset.ttl, &rdata);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS)
break;
}
dns_rdataset_disassociate(&rdataset);
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
failure:
if (node != NULL)
dns_db_detachnode(db, &node);
return (result);
}
static isc_result_t
add_exposed_sigs(ns_client_t *client, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *ver, dns_name_t *name, isc_boolean_t cut,
dns_diff_t *diff, dst_key_t **keys, unsigned int nkeys,
isc_stdtime_t inception, isc_stdtime_t expire,
isc_boolean_t check_ksk, isc_boolean_t keyset_kskonly)
{
isc_result_t result;
dns_dbnode_t *node;
dns_rdatasetiter_t *iter;
node = NULL;
result = dns_db_findnode(db, name, ISC_FALSE, &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,
(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_rdatatype_t type;
isc_boolean_t flag;
dns_rdataset_init(&rdataset);
dns_rdatasetiter_current(iter, &rdataset);
type = rdataset.type;
dns_rdataset_disassociate(&rdataset);
/*
* We don't need to sign unsigned NSEC records at the cut
* as they are handled elsewhere.
*/
if ((type == dns_rdatatype_rrsig) ||
(cut && type != dns_rdatatype_ds))
continue;
result = rrset_exists(db, ver, name, dns_rdatatype_rrsig,
type, &flag);
if (result != ISC_R_SUCCESS)
goto cleanup_iterator;
if (flag)
continue;;
result = add_sigs(client, zone, db, ver, name, type, diff,
keys, nkeys, inception, expire,
check_ksk, keyset_kskonly);
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);
}
/*%
* Update RRSIG, NSEC and NSEC3 records affected by an update. The original
* update, including the SOA serial update but excluding the RRSIG & NSEC
* changes, is in "diff" and has already been applied to "newver" of "db".
* The database version prior to the update is "oldver".
*
* The necessary RRSIG, NSEC and NSEC3 changes will be applied to "newver"
* and added (as a minimal diff) to "diff".
*
* The RRSIGs generated will be valid for 'sigvalidityinterval' seconds.
*/
static isc_result_t
update_signatures(ns_client_t *client, dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t *oldver, dns_dbversion_t *newver,
dns_diff_t *diff, isc_uint32_t sigvalidityinterval)
{
isc_result_t result;
dns_difftuple_t *t;
dns_diff_t diffnames;
dns_diff_t affected;
dns_diff_t sig_diff;
dns_diff_t nsec_diff;
dns_diff_t nsec_mindiff;
isc_boolean_t flag, build_nsec, build_nsec3;
dst_key_t *zone_keys[MAXZONEKEYS];
unsigned int nkeys = 0;
unsigned int i;
isc_stdtime_t now, inception, expire;
dns_ttl_t nsecttl;
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t rdataset;
dns_dbnode_t *node = NULL;
isc_boolean_t check_ksk, keyset_kskonly;
isc_boolean_t unsecure;
isc_boolean_t cut;
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
dns_diff_init(client->mctx, &diffnames);
dns_diff_init(client->mctx, &affected);
dns_diff_init(client->mctx, &sig_diff);
sig_diff.resign = dns_zone_getsigresigninginterval(zone);
dns_diff_init(client->mctx, &nsec_diff);
dns_diff_init(client->mctx, &nsec_mindiff);
result = find_zone_keys(zone, db, newver, client->mctx,
MAXZONEKEYS, zone_keys, &nkeys);
if (result != ISC_R_SUCCESS) {
update_log(client, zone, ISC_LOG_ERROR,
"could not get zone keys for secure dynamic update");
goto failure;
}
isc_stdtime_get(&now);
inception = now - 3600; /* Allow for some clock skew. */
expire = now + sigvalidityinterval;
/*
* Do we look at the KSK flag on the DNSKEY to determining which
* keys sign which RRsets? First check the zone option then
* check the keys flags to make sure at least one has a ksk set
* and one doesn't.
*/
check_ksk = ISC_TF((dns_zone_getoptions(zone) &
DNS_ZONEOPT_UPDATECHECKKSK) != 0);
keyset_kskonly = ISC_TF((dns_zone_getoptions(zone) &
DNS_ZONEOPT_DNSKEYKSKONLY) != 0);
/*
* Get the NSEC/NSEC3 TTL from the SOA MINIMUM field.
*/
CHECK(dns_db_findnode(db, dns_db_origin(db), ISC_FALSE, &node));
dns_rdataset_init(&rdataset);
CHECK(dns_db_findrdataset(db, node, newver, dns_rdatatype_soa, 0,
(isc_stdtime_t) 0, &rdataset, NULL));
CHECK(dns_rdataset_first(&rdataset));
dns_rdataset_current(&rdataset, &rdata);
CHECK(dns_rdata_tostruct(&rdata, &soa, NULL));
nsecttl = soa.minimum;
dns_rdataset_disassociate(&rdataset);
dns_db_detachnode(db, &node);
/*
* Find all RRsets directly affected by the update, and
* update their RRSIGs. Also build a list of names affected
* by the update in "diffnames".
*/
CHECK(dns_diff_sort(diff, temp_order));
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
/* Now "name" is a new, unique name affected by the update. */
CHECK(namelist_append_name(&diffnames, name));
while (t != NULL && dns_name_equal(&t->name, name)) {
dns_rdatatype_t type;
type = t->rdata.type;
/*
* Now "name" and "type" denote a new unique RRset
* affected by the update.
*/
/* Don't sign RRSIGs. */
if (type == dns_rdatatype_rrsig)
goto skip;
/*
* Delete all old RRSIGs covering this type, since they
* are all invalid when the signed RRset has changed.
* We may not be able to recreate all of them - tough.
* Special case changes to the zone's DNSKEY records
* to support offline KSKs.
*/
if (type == dns_rdatatype_dnskey)
del_keysigs(db, newver, name, &sig_diff,
zone_keys, nkeys);
else
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_rrsig, type,
NULL, &sig_diff));
/*
* If this RRset is still visible after the update,
* add a new signature for it.
*/
CHECK(rrset_visible(db, newver, name, type, &flag));
if (flag) {
CHECK(add_sigs(client, zone, db, newver, name,
type, &sig_diff, zone_keys,
nkeys, inception, expire,
check_ksk, keyset_kskonly));
}
skip:
/* Skip any other updates to the same RRset. */
while (t != NULL &&
dns_name_equal(&t->name, name) &&
t->rdata.type == type)
{
t = ISC_LIST_NEXT(t, link);
}
}
}
update_log(client, zone, ISC_LOG_DEBUG(3), "updated data signatures");
/* Remove orphaned NSECs and RRSIG NSECs. */
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(non_nsec_rrset_exists(db, newver, &t->name, &flag));
if (! flag) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_any, 0,
NULL, &sig_diff));
}
}
update_log(client, zone, ISC_LOG_DEBUG(3),
"removed any orphaned NSEC records");
/*
* See if we need to build NSEC or NSEC3 chains.
*/
CHECK(dns_private_chains(db, newver, privatetype, &build_nsec,
&build_nsec3));
if (!build_nsec)
goto update_nsec3;
update_log(client, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC chain");
/*
* When a name is created or deleted, its predecessor needs to
* have its NSEC updated.
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t existed, exists;
dns_fixedname_t fixedname;
dns_name_t *prevname;
dns_fixedname_init(&fixedname);
prevname = dns_fixedname_name(&fixedname);
CHECK(name_exists(db, oldver, &t->name, &existed));
CHECK(name_exists(db, newver, &t->name, &exists));
if (exists == existed)
continue;
/*
* Find the predecessor.
* When names become obscured or unobscured in this update
* transaction, we may find the wrong predecessor because
* the NSECs have not yet been updated to reflect the delegation
* change. This should not matter because in this case,
* the correct predecessor is either the delegation node or
* a newly unobscured node, and those nodes are on the
* "affected" list in any case.
*/
CHECK(next_active(client, zone, db, newver,
&t->name, prevname, ISC_FALSE));
CHECK(namelist_append_name(&affected, prevname));
}
/*
* Find names potentially affected by delegation changes
* (obscured by adding an NS or DNAME, or unobscured by
* removing one).
*/
for (t = ISC_LIST_HEAD(diffnames.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t ns_existed, dname_existed;
isc_boolean_t ns_exists, dname_exists;
CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_ns, 0,
&ns_existed));
CHECK(rrset_exists(db, oldver, &t->name, dns_rdatatype_dname, 0,
&dname_existed));
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_ns, 0,
&ns_exists));
CHECK(rrset_exists(db, newver, &t->name, dns_rdatatype_dname, 0,
&dname_exists));
if ((ns_exists || dname_exists) == (ns_existed || dname_existed))
continue;
/*
* There was a delegation change. Mark all subdomains
* of t->name as potentially needing a NSEC update.
*/
CHECK(namelist_append_subdomain(db, &t->name, &affected));
}
ISC_LIST_APPENDLIST(affected.tuples, diffnames.tuples, link);
INSIST(ISC_LIST_EMPTY(diffnames.tuples));
CHECK(uniqify_name_list(&affected));
/*
* Determine which names should have NSECs, and delete/create
* NSECs to make it so. We don't know the final NSEC targets yet,
* so we just create placeholder NSECs with arbitrary contents
* to indicate that their respective owner names should be part of
* the NSEC chain.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
isc_boolean_t exists;
dns_name_t *name = &t->name;
CHECK(name_exists(db, newver, name, &exists));
if (! exists)
continue;
CHECK(is_active(db, newver, name, &flag, &cut, NULL));
if (!flag) {
/*
* This name is obscured. Delete any
* existing NSEC record.
*/
CHECK(delete_if(true_p, db, newver, name,
dns_rdatatype_nsec, 0,
NULL, &nsec_diff));
CHECK(delete_if(rrsig_p, db, newver, name,
dns_rdatatype_any, 0, NULL, diff));
} else {
/*
* This name is not obscured. It needs to have a
* NSEC unless it is the at the origin, in which
* case it should already exist if there is a complete
* NSEC chain and if there isn't a complete NSEC chain
* we don't want to add one as that would signal that
* there is a complete NSEC chain.
*/
if (!dns_name_equal(name, dns_db_origin(db))) {
CHECK(rrset_exists(db, newver, name,
dns_rdatatype_nsec, 0,
&flag));
if (!flag)
CHECK(add_placeholder_nsec(db, newver,
name, diff));
}
CHECK(add_exposed_sigs(client, zone, db, newver, name,
cut, diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
}
}
/*
* Now we know which names are part of the NSEC chain.
* Make them all point at their correct targets.
*/
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
CHECK(rrset_exists(db, newver, &t->name,
dns_rdatatype_nsec, 0, &flag));
if (flag) {
/*
* There is a NSEC, but we don't know if it is correct.
* Delete it and create a correct one to be sure.
* If the update was unnecessary, the diff minimization
* will take care of eliminating it from the journal,
* IXFRs, etc.
*
* The RRSIG bit should always be set in the NSECs
* we generate, because they will all get RRSIG NSECs.
* (XXX what if the zone keys are missing?).
* Because the RRSIG NSECs have not necessarily been
* created yet, the correctness of the bit mask relies
* on the assumption that NSECs are only created if
* there is other data, and if there is other data,
* there are other RRSIGs.
*/
CHECK(add_nsec(client, zone, db, newver, &t->name,
nsecttl, &nsec_diff));
}
}
/*
* Minimize the set of NSEC updates so that we don't
* have to regenerate the RRSIG NSECs for NSECs that were
* replaced with identical ones.
*/
while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_diff.tuples, t, link);
dns_diff_appendminimal(&nsec_mindiff, &t);
}
update_log(client, zone, ISC_LOG_DEBUG(3),
"signing rebuilt NSEC chain");
/* Update RRSIG NSECs. */
for (t = ISC_LIST_HEAD(nsec_mindiff.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
if (t->op == DNS_DIFFOP_DEL) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_rrsig, dns_rdatatype_nsec,
NULL, &sig_diff));
} else if (t->op == DNS_DIFFOP_ADD) {
CHECK(add_sigs(client, zone, db, newver, &t->name,
dns_rdatatype_nsec, &sig_diff,
zone_keys, nkeys, inception, expire,
check_ksk, keyset_kskonly));
} else {
INSIST(0);
}
}
update_nsec3:
/* Record our changes for the journal. */
while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(sig_diff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples));
if (!build_nsec3) {
update_log(client, zone, ISC_LOG_DEBUG(3),
"no NSEC3 chains to rebuild");
goto failure;
}
update_log(client, zone, ISC_LOG_DEBUG(3), "rebuilding NSEC3 chains");
dns_diff_clear(&diffnames);
dns_diff_clear(&affected);
CHECK(dns_diff_sort(diff, temp_order));
/*
* Find names potentially affected by delegation changes
* (obscured by adding an NS or DNAME, or unobscured by
* removing one).
*/
t = ISC_LIST_HEAD(diff->tuples);
while (t != NULL) {
dns_name_t *name = &t->name;
isc_boolean_t ns_existed, dname_existed;
isc_boolean_t ns_exists, dname_exists;
isc_boolean_t exists, existed;
if (t->rdata.type == dns_rdatatype_nsec ||
t->rdata.type == dns_rdatatype_rrsig) {
t = ISC_LIST_NEXT(t, link);
continue;
}
CHECK(namelist_append_name(&affected, name));
CHECK(rrset_exists(db, oldver, name, dns_rdatatype_ns, 0,
&ns_existed));
CHECK(rrset_exists(db, oldver, name, dns_rdatatype_dname, 0,
&dname_existed));
CHECK(rrset_exists(db, newver, name, dns_rdatatype_ns, 0,
&ns_exists));
CHECK(rrset_exists(db, newver, name, dns_rdatatype_dname, 0,
&dname_exists));
exists = ns_exists || dname_exists;
existed = ns_existed || dname_existed;
if (exists == existed)
goto nextname;
/*
* There was a delegation change. Mark all subdomains
* of t->name as potentially needing a NSEC3 update.
*/
CHECK(namelist_append_subdomain(db, name, &affected));
nextname:
while (t != NULL && dns_name_equal(&t->name, name))
t = ISC_LIST_NEXT(t, link);
}
for (t = ISC_LIST_HEAD(affected.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link)) {
dns_name_t *name = &t->name;
unsecure = ISC_FALSE; /* Silence compiler warning. */
CHECK(is_active(db, newver, name, &flag, &cut, &unsecure));
if (!flag) {
CHECK(delete_if(rrsig_p, db, newver, name,
dns_rdatatype_any, 0, NULL, diff));
CHECK(dns_nsec3_delnsec3sx(db, newver, name,
privatetype, &nsec_diff));
} else {
CHECK(add_exposed_sigs(client, zone, db, newver, name,
cut, diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
CHECK(dns_nsec3_addnsec3sx(db, newver, name, nsecttl,
unsecure, privatetype,
&nsec_diff));
}
}
/*
* Minimize the set of NSEC3 updates so that we don't
* have to regenerate the RRSIG NSEC3s for NSEC3s that were
* replaced with identical ones.
*/
while ((t = ISC_LIST_HEAD(nsec_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_diff.tuples, t, link);
dns_diff_appendminimal(&nsec_mindiff, &t);
}
update_log(client, zone, ISC_LOG_DEBUG(3),
"signing rebuilt NSEC3 chain");
/* Update RRSIG NSEC3s. */
for (t = ISC_LIST_HEAD(nsec_mindiff.tuples);
t != NULL;
t = ISC_LIST_NEXT(t, link))
{
if (t->op == DNS_DIFFOP_DEL) {
CHECK(delete_if(true_p, db, newver, &t->name,
dns_rdatatype_rrsig,
dns_rdatatype_nsec3,
NULL, &sig_diff));
} else if (t->op == DNS_DIFFOP_ADD) {
CHECK(add_sigs(client, zone, db, newver, &t->name,
dns_rdatatype_nsec3,
&sig_diff, zone_keys, nkeys,
inception, expire, check_ksk,
keyset_kskonly));
} else {
INSIST(0);
}
}
/* Record our changes for the journal. */
while ((t = ISC_LIST_HEAD(sig_diff.tuples)) != NULL) {
ISC_LIST_UNLINK(sig_diff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
while ((t = ISC_LIST_HEAD(nsec_mindiff.tuples)) != NULL) {
ISC_LIST_UNLINK(nsec_mindiff.tuples, t, link);
dns_diff_appendminimal(diff, &t);
}
INSIST(ISC_LIST_EMPTY(sig_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_diff.tuples));
INSIST(ISC_LIST_EMPTY(nsec_mindiff.tuples));
failure:
dns_diff_clear(&sig_diff);
dns_diff_clear(&nsec_diff);
dns_diff_clear(&nsec_mindiff);
dns_diff_clear(&affected);
dns_diff_clear(&diffnames);
for (i = 0; i < nkeys; i++)
dst_key_free(&zone_keys[i]);
return (result);
}
/**************************************************************************/
/*%
* 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;
ns_client_t *evclient;
event = (update_event_t *)
isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE,
update_action, NULL, sizeof(*event));
if (event == NULL)
FAIL(ISC_R_NOMEMORY);
event->zone = zone;
event->result = ISC_R_SUCCESS;
evclient = NULL;
ns_client_attach(client, &evclient);
INSIST(client->nupdates == 0);
client->nupdates++;
event->ev_arg = evclient;
dns_zone_gettask(zone, &zonetask);
isc_task_send(zonetask, ISC_EVENT_PTR(&event));
failure:
if (event != NULL)
isc_event_free(ISC_EVENT_PTR(&event));
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, ISC_TRUE);
if (msg_result != ISC_R_SUCCESS)
goto msg_failure;
client->message->rcode = dns_result_torcode(result);
ns_client_send(client);
return;
msg_failure:
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_UPDATE, NS_LOGMODULE_UPDATE,
ISC_LOG_ERROR,
"could not create update response message: %s",
isc_result_totext(msg_result));
ns_client_next(client, msg_result);
}
void
ns_update_start(ns_client_t *client, 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;
/*
* 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)
FAILC(DNS_R_NOTAUTH, "not authoritative for update zone");
switch(dns_zone_gettype(zone)) {
case dns_zone_master:
/*
* We can now fail due to a bad signature as we now know
* that we are the master.
*/
if (sigresult != ISC_R_SUCCESS)
FAIL(sigresult);
CHECK(send_update_event(client, zone));
break;
case dns_zone_slave:
CHECK(checkupdateacl(client, dns_zone_getforwardacl(zone),
"update forwarding", zonename, ISC_TRUE,
ISC_FALSE));
CHECK(send_forward_event(client, zone));
break;
default:
FAILC(DNS_R_NOTAUTH, "not authoritative for update zone");
}
return;
failure:
if (result == DNS_R_REFUSED) {
INSIST(dns_zone_gettype(zone) == dns_zone_slave);
inc_stats(zone, dns_nsstatscounter_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.
*/
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;
isc_boolean_t ns_exists;
dns_difftuple_t *tupple;
dns_diff_t temp_diff;
dns_diff_init(diff->mctx, &temp_diff);
for (tupple = ISC_LIST_HEAD(diff->tuples);
tupple != NULL;
tupple = ISC_LIST_NEXT(tupple, link)) {
if (!((tupple->op == DNS_DIFFOP_DEL &&
tupple->rdata.type == dns_rdatatype_ns) ||
(tupple->op == DNS_DIFFOP_ADD &&
tupple->rdata.type == dns_rdatatype_ds)))
continue;
CHECK(rrset_exists(db, newver, &tupple->name,
dns_rdatatype_ns, 0, &ns_exists));
if (ns_exists &&
!dns_name_equal(&tupple->name, dns_db_origin(db)))
continue;
CHECK(delete_if(true_p, db, newver, &tupple->name,
dns_rdatatype_ds, 0, NULL, &temp_diff));
}
result = ISC_R_SUCCESS;
failure:
for (tupple = ISC_LIST_HEAD(temp_diff.tuples);
tupple != NULL;
tupple = ISC_LIST_HEAD(temp_diff.tuples)) {
ISC_LIST_UNLINK(temp_diff.tuples, tupple, link);
dns_diff_appendminimal(diff, &tupple);
}
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;
isc_boolean_t ok = ISC_TRUE;
isc_boolean_t isaddress;
isc_result_t result;
struct in6_addr addr6;
struct in_addr addr;
unsigned int options;
dns_fixedname_init(&fixed);
foundname = dns_fixedname_name(&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 = ISC_FALSE;
if ((options & DNS_RDATA_CHECKMX) != 0 &&
strlcpy(tmp, namebuf, sizeof(tmp)) < sizeof(tmp)) {
if (tmp[strlen(tmp) - 1] == '.')
tmp[strlen(tmp) - 1] = '\0';
if (inet_aton(tmp, &addr) == 1 ||
inet_pton(AF_INET6, tmp, &addr6) == 1)
isaddress = ISC_TRUE;
}
if (isaddress && (options & DNS_RDATA_CHECKMXFAIL) != 0) {
update_log(client, zone, ISC_LOG_ERROR,
"%s/MX: '%s': %s",
ownerbuf, namebuf,
dns_result_totext(DNS_R_MXISADDRESS));
ok = ISC_FALSE;
} else if (isaddress) {
update_log(client, zone, ISC_LOG_WARNING,
"%s/MX: warning: '%s': %s",
ownerbuf, namebuf,
dns_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 = ISC_FALSE;
} else if (result == DNS_R_CNAME) {
update_log(client, zone, ISC_LOG_ERROR,
"%s/MX '%s' is a CNAME (illegal)",
ownerbuf, namebuf);
ok = ISC_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 = ISC_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, isc_boolean_t *flag)
{
dns_rdataset_t rdataset;
dns_dbnode_t *node = NULL;
isc_result_t result;
dns_rdataset_init(&rdataset);
if (rdata->type == dns_rdatatype_nsec3)
CHECK(dns_db_findnsec3node(db, name, ISC_FALSE, &node));
else
CHECK(dns_db_findnode(db, name, ISC_FALSE, &node));
result = dns_db_findrdataset(db, node, ver, rdata->type, 0,
(isc_stdtime_t) 0, &rdataset, NULL);
if (result == ISC_R_NOTFOUND) {
*flag = ISC_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_compare(&myrdata, rdata))
break;
}
dns_rdataset_disassociate(&rdataset);
if (result == ISC_R_SUCCESS) {
*flag = ISC_TRUE;
} else if (result == ISC_R_NOMORE) {
*flag = ISC_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)
{
dns_diff_t temp_diff;
dns_diffop_t op;
dns_difftuple_t *tuple, *newtuple = NULL, *next;
isc_boolean_t flag;
isc_result_t result;
unsigned int iterations = 0, max;
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
dns_diff_init(diff->mctx, &temp_diff);
CHECK(dns_nsec_nseconly(db, ver, &flag));
if (flag)
CHECK(dns_nsec3_activex(db, ver, ISC_FALSE,
privatetype, &flag));
if (flag) {
update_log(client, zone, ISC_LOG_WARNING,
"NSEC only DNSKEYs and NSEC3 chains not allowed");
} else {
CHECK(get_iterations(db, ver, privatetype, &iterations));
CHECK(dns_nsec3_maxiterations(db, ver, client->mctx, &max));
if (max != 0 && iterations > max) {
flag = ISC_TRUE;
update_log(client, zone, ISC_LOG_WARNING,
"too many NSEC3 iterations (%u) for "
"weakest DNSKEY (%u)", iterations, max);
}
}
if (flag) {
for (tuple = ISC_LIST_HEAD(diff->tuples);
tuple != NULL;
tuple = next) {
next = ISC_LIST_NEXT(tuple, link);
if (tuple->rdata.type != dns_rdatatype_dnskey &&
tuple->rdata.type != dns_rdatatype_nsec3param)
continue;
op = (tuple->op == DNS_DIFFOP_DEL) ?
DNS_DIFFOP_ADD : DNS_DIFFOP_DEL;
CHECK(dns_difftuple_create(temp_diff.mctx, op,
&tuple->name, tuple->ttl,
&tuple->rdata, &newtuple));
CHECK(do_one_tuple(&newtuple, db, ver, &temp_diff));
INSIST(newtuple == NULL);
}
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);
}
}
failure:
dns_diff_clear(&temp_diff);
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;
isc_boolean_t flag;
dns_name_t *name = dns_zone_getorigin(zone);
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);;
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);
}
for (tuple = ISC_LIST_HEAD(temp_diff.tuples);
tuple != NULL; tuple = next) {
if (tuple->op == DNS_DIFFOP_ADD) {
next = ISC_LIST_NEXT(tuple, link);
while (next != NULL) {
unsigned char *next_data = next->rdata.data;
unsigned char *tuple_data = tuple->rdata.data;
if (next_data[0] != tuple_data[0] ||
/* Ignore flags. */
next_data[2] != tuple_data[2] ||
next_data[3] != tuple_data[3] ||
next_data[4] != tuple_data[4] ||
!memcmp(&next_data[5], &tuple_data[5],
tuple_data[4])) {
next = ISC_LIST_NEXT(next, link);
continue;
}
op = (next->op == DNS_DIFFOP_DEL) ?
DNS_DIFFOP_ADD : DNS_DIFFOP_DEL;
CHECK(dns_difftuple_create(diff->mctx, op,
name, next->ttl,
&next->rdata,
&newtuple));
CHECK(do_one_tuple(&newtuple, db, ver, diff));
ISC_LIST_UNLINK(temp_diff.tuples, next, link);
dns_diff_appendminimal(diff, &next);
next = ISC_LIST_NEXT(tuple, link);
}
INSIST(tuple->rdata.data[1] & DNS_NSEC3FLAG_UPDATE);
/*
* See if we already have a CREATE request in progress.
*/
dns_nsec3param_toprivate(&tuple->rdata, &rdata,
privatetype, buf, sizeof(buf));
buf[2] |= DNS_NSEC3FLAG_CREATE;
buf[2] &= ~DNS_NSEC3FLAG_UPDATE;
CHECK(rr_exists(db, ver, name, &rdata, &flag));
if (!flag) {
CHECK(dns_difftuple_create(diff->mctx,
DNS_DIFFOP_ADD,
name, tuple->ttl,
&rdata,
&newtuple));
CHECK(do_one_tuple(&newtuple, db, ver, diff));
}
/*
* Remove the temporary add record.
*/
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL,
name, tuple->ttl,
&tuple->rdata, &newtuple));
CHECK(do_one_tuple(&newtuple, db, ver, diff));
next = ISC_LIST_NEXT(tuple, link);
ISC_LIST_UNLINK(temp_diff.tuples, tuple, link);
dns_diff_appendminimal(diff, &tuple);
dns_rdata_reset(&rdata);
} else
next = ISC_LIST_NEXT(tuple, link);
}
/*
* Reverse any pending changes.
*/
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) {
op = (tuple->op == DNS_DIFFOP_DEL) ?
DNS_DIFFOP_ADD : DNS_DIFFOP_DEL;
CHECK(dns_difftuple_create(diff->mctx, op, name,
tuple->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);
}
}
/*
* Convert deletions into delayed deletions.
*/
for (tuple = ISC_LIST_HEAD(temp_diff.tuples);
tuple != NULL; tuple = next) {
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;
CHECK(rr_exists(db, ver, name, &rdata, &flag));
if (!flag) {
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
name, tuple->ttl, &rdata,
&newtuple));
CHECK(do_one_tuple(&newtuple, db, ver, diff));
}
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD, name,
tuple->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 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;
dns_rdata_dnskey_t dnskey;
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_boolean_t flag;
isc_region_t r;
isc_result_t result = ISC_R_SUCCESS;
isc_uint16_t keyid;
unsigned char buf[5];
dns_name_t *name = dns_db_origin(db);
for (tuple = ISC_LIST_HEAD(diff->tuples);
tuple != NULL;
tuple = ISC_LIST_NEXT(tuple, link)) {
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);
keyid = dst_region_computeid(&r, dnskey.algorithm);
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:
return (result);
}
/*
* Mark all NSEC3 chains for deletion without creating a NSEC chain as
* a side effect of deleting the last chain.
*/
static isc_result_t
delete_chains(dns_db_t *db, dns_dbversion_t *ver, dns_zone_t *zone,
dns_diff_t *diff)
{
dns_dbnode_t *node = NULL;
dns_difftuple_t *tuple = NULL;
dns_name_t next;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t rdataset;
isc_boolean_t flag;
isc_result_t result = ISC_R_SUCCESS;
unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE + 1];
dns_name_t *origin = dns_zone_getorigin(zone);
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
dns_name_init(&next, NULL);
dns_rdataset_init(&rdataset);
result = dns_db_getoriginnode(db, &node);
if (result != ISC_R_SUCCESS)
return (result);
/*
* Cause all NSEC3 chains to be deleted.
*/
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 private = DNS_RDATA_INIT;
dns_rdataset_current(&rdataset, &rdata);
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
rdataset.ttl, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
dns_nsec3param_toprivate(&rdata, &private, privatetype,
buf, sizeof(buf));
buf[2] = DNS_NSEC3FLAG_REMOVE | DNS_NSEC3FLAG_NONSEC;
CHECK(rr_exists(db, ver, origin, &rdata, &flag));
if (!flag) {
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
origin, 0, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
}
dns_rdata_reset(&rdata);
}
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)) {
dns_rdataset_current(&rdataset, &rdata);
INSIST(rdata.length <= sizeof(buf));
memcpy(buf, rdata.data, rdata.length);
if (buf[0] != 0 ||
buf[2] == (DNS_NSEC3FLAG_REMOVE | DNS_NSEC3FLAG_NONSEC)) {
dns_rdata_reset(&rdata);
continue;
}
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_DEL, origin,
0, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
buf[2] = DNS_NSEC3FLAG_REMOVE | DNS_NSEC3FLAG_NONSEC;
CHECK(rr_exists(db, ver, origin, &rdata, &flag));
if (!flag) {
CHECK(dns_difftuple_create(diff->mctx, DNS_DIFFOP_ADD,
origin, 0, &rdata, &tuple));
CHECK(do_one_tuple(&tuple, db, ver, diff));
INSIST(tuple == NULL);
}
dns_rdata_reset(&rdata);
}
if (result != ISC_R_NOMORE)
goto failure;
success:
result = ISC_R_SUCCESS;
failure:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
dns_db_detachnode(db, &node);
return (result);
}
static isc_boolean_t
isdnssec(dns_db_t *db, dns_dbversion_t *ver, dns_rdatatype_t privatetype) {
isc_result_t result;
isc_boolean_t build_nsec, build_nsec3;
if (dns_db_issecure(db))
return (ISC_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;
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. */
isc_boolean_t soa_serial_changed = ISC_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;
dns_ssutable_t *ssutable = NULL;
dns_fixedname_t tmpnamefixed;
dns_name_t *tmpname = NULL;
unsigned int options;
dns_difftuple_t *tuple;
dns_rdata_dnskey_t dnskey;
unsigned char buf[DNS_NSEC3PARAM_BUFFERSIZE];
isc_boolean_t had_dnskey;
dns_rdatatype_t privatetype = dns_zone_getprivatetype(zone);
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);
/*
* Update message processing can leak record existance 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), zonename,
dns_zone_getupdateacl(zone), ssutable));
/*
* 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;
isc_boolean_t 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(__FILE__, __LINE__,
"temp entry creation failed: %s",
dns_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");
dns_fixedname_init(&tmpnamefixed);
tmpname = dns_fixedname_name(&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");
/*
* Check Requestor's Permissions. It seems a bit silly to do this
* only after prerequisite testing, but that is what RFC2136 says.
*/
result = ISC_R_SUCCESS;
if (ssutable == NULL)
CHECK(checkupdateacl(client, dns_zone_getupdateacl(zone),
"update", zonename, ISC_FALSE, ISC_FALSE));
else if (client->signer == NULL && !TCPCLIENT(client))
CHECK(checkupdateacl(client, NULL, "update", zonename,
ISC_FALSE, ISC_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.");
/*
* Perform the Update Section Prescan.
*/
for (result = dns_message_firstname(request, DNS_SECTION_UPDATE);
result == ISC_R_SUCCESS;
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;
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 *tcpaddr, netaddr;
/*
* If this is a TCP connection then pass the
* address of the client through for tcp-self
* and 6to4-self otherwise pass NULL. This
* provides weak address based authentication.
*/
if (TCPCLIENT(client)) {
isc_netaddr_fromsockaddr(&netaddr,
&client->peeraddr);
tcpaddr = &netaddr;
} else
tcpaddr = NULL;
if (rdata.type != dns_rdatatype_any) {
if (!dns_ssutable_checkrules(ssutable,
client->signer,
name, tcpaddr,
rdata.type))
FAILC(DNS_R_REFUSED,
"rejected by secure update");
} else {
if (!ssu_checkall(db, ver, name, ssutable,
client->signer, tcpaddr))
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");
/*
* Process the Update Section.
*/
options = dns_zone_getoptions(zone);
for (result = dns_message_firstname(request, DNS_SECTION_UPDATE);
result == ISC_R_SUCCESS;
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;
isc_boolean_t flag;
get_current_rr(request, DNS_SECTION_UPDATE, zoneclass,
&name, &rdata, &covers, &ttl, &update_class);
if (update_class == zoneclass) {
/*
* RFC1123 doesn't allow MF and MD in master zones. */
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_isdnssec(rdata.type))
{
update_log(client, zone,
LOGLEVEL_PROTOCOL,
"attempt to add non-CNAME "
"alongside CNAME ignored");
continue;
}
}
if (rdata.type == dns_rdatatype_soa) {
isc_boolean_t 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 = ISC_TRUE;
}
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;
}
/*
* NSEC3CHAIN creation flag.
*/
INSIST(rdata.length <= sizeof(buf));
memcpy(buf, rdata.data, rdata.length);
buf[1] |= DNS_NSEC3FLAG_UPDATE;
rdata.data = buf;
/*
* Force the TTL to zero for NSEC3PARAM records.
*/
ttl = 0;
}
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 (isc_log_wouldlog(ns_g_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,
"adding an RR at '%s' %s",
namestr, typestr);
}
/* 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.update_rr = &rdata;
ctx.update_rr_ttl = ttl;
ctx.ignore_add = ISC_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 {
CHECK(do_diff(&ctx.del_diff, db, ver,
&diff));
CHECK(do_diff(&ctx.add_diff, db, ver,
&diff));
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_g_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_g_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 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;
isc_boolean_t 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(increment_soa_serial(db, ver, &diff, mctx));
}
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)
if (!ALLOW_SECURE_TO_INSECURE(zone)) {
CHECK(rrset_exists(db, oldver, zonename,
dns_rdatatype_dnskey, 0,
&had_dnskey));
if (had_dnskey && !has_dnskey) {
update_log(client, zone, LOGLEVEL_PROTOCOL,
"update rejected: all DNSKEY records "
"removed and '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 (!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(delete_chains(db, ver, zone, &diff));
} else if (has_dnskey && isdnssec(db, ver, privatetype)) {
isc_uint32_t interval;
interval = dns_zone_getsigvalidityinterval(zone);
result = update_signatures(client, 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;
}
}
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,
ISC_TRUE, &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, ISC_TRUE);
/*
* Mark the zone as dirty so that it will be written to disk.
*/
dns_zone_markdirty(zone);
/*
* Notify slaves 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;
isc_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, algorithm);
result = dns_zone_signwithkey(zone, algorithm, keyid,
ISC_TF(tuple->op == DNS_DIFFOP_DEL));
if (result != ISC_R_SUCCESS) {
update_log(client, zone, ISC_LOG_ERROR,
"dns_zone_signwithkey failed: %s",
dns_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",
dns_result_totext(result));
}
}
} else {
update_log(client, zone, LOGLEVEL_DEBUG, "redundant request");
dns_db_closeversion(db, &ver, ISC_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, ISC_FALSE);
}
common:
dns_diff_clear(&temp);
dns_diff_clear(&diff);
if (oldver != NULL)
dns_db_closeversion(db, &oldver, ISC_FALSE);
if (db != NULL)
dns_db_detach(&db);
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(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);
INSIST(event->ev_type == DNS_EVENT_UPDATEDONE);
INSIST(task == client->task);
INSIST(client->nupdates > 0);
switch (uev->result) {
case ISC_R_SUCCESS:
inc_stats(uev->zone, dns_nsstatscounter_updatedone);
break;
case DNS_R_REFUSED:
inc_stats(uev->zone, dns_nsstatscounter_updaterej);
break;
default:
inc_stats(uev->zone, dns_nsstatscounter_updatefail);
break;
}
if (uev->zone != NULL)
dns_zone_detach(&uev->zone);
client->nupdates--;
respond(client, uev->result);
isc_event_free(&event);
ns_client_detach(&client);
}
/*%
* 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_event_free(&event);
ns_client_detach(&client);
}
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(zone, dns_nsstatscounter_updatefwdfail);
} else {
uev->ev_type = DNS_EVENT_UPDATEDONE;
uev->ev_action = forward_done;
uev->answer = answer;
inc_stats(zone, dns_nsstatscounter_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_destroy(&uev->answer);
isc_event_free(&event);
ns_client_detach(&client);
}
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(zone, dns_nsstatscounter_updatefwdfail);
dns_zone_detach(&zone);
} else
inc_stats(zone, dns_nsstatscounter_updatereqfwd);
isc_task_detach(&task);
}
static isc_result_t
send_forward_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;
ns_client_t *evclient;
event = (update_event_t *)
isc_event_allocate(client->mctx, client, DNS_EVENT_UPDATE,
forward_action, NULL, sizeof(*event));
if (event == NULL)
FAIL(ISC_R_NOMEMORY);
event->zone = zone;
event->result = ISC_R_SUCCESS;
evclient = NULL;
ns_client_attach(client, &evclient);
INSIST(client->nupdates == 0);
client->nupdates++;
event->ev_arg = evclient;
dns_zone_gettask(zone, &zonetask);
isc_task_send(zonetask, ISC_EVENT_PTR(&event));
failure:
if (event != NULL)
isc_event_free(ISC_EVENT_PTR(&event));
return (result);
}