/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <stdbool.h>
#include <string.h>
#include <isc/hex.h>
#include <isc/mem.h>
#include <isc/platform.h>
#include <isc/print.h>
#include <isc/rwlock.h>
#include <isc/serial.h>
#include <isc/stats.h>
#include <isc/thread.h>
#include <isc/util.h>
#include <dns/adb.h>
#include <dns/badcache.h>
#include <dns/byaddr.h>
#include <dns/cache.h>
#include <dns/db.h>
#include <dns/dlz.h>
#include <dns/dns64.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/keytable.h>
#include <dns/message.h>
#include <dns/ncache.h>
#include <dns/nsec3.h>
#include <dns/order.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/stats.h>
#include <dns/tkey.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <named/client.h>
#include <named/globals.h>
#include <named/log.h>
#include <named/server.h>
#include <named/sortlist.h>
#include <named/xfrout.h>
#if defined(ISC_PLATFORM_HAVESTDATOMIC)
#if defined(__cplusplus)
#include <isc/stdatomic.h>
#else
#include <stdatomic.h>
#endif
#define last_load(x) atomic_load((x))
#define last_cmpxchg(x, e, r) atomic_compare_exchange_strong((x), (e), r)
#elif defined(ISC_PLATFORM_HAVEXADD) && defined(ISC_PLATFORM_HAVECMPXCHG)
#define last_load(x) (isc_stdtime_t)isc_atomic_xadd((int32_t*)(x), 0)
#define last_cmpxchg(x, e, r) isc_atomic_cmpxchg((int32_t*)x, (*(int32_t*)(e)), (int32_t)(r))
#else
#define last_load(x) (*(x))
static inline bool
last_cmpxchg(isc_stdtime_t *x, isc_stdtime_t *e, isc_stdtime_t r) {
if (*x == *e) {
*x = r;
return (true);
}
return (false);
}
#endif
#if 0
/*
* It has been recommended that DNS64 be changed to return excluded
* AAAA addresses if DNS64 synthesis does not occur. This minimises
* the impact on the lookup results. While most DNS AAAA lookups are
* done to send IP packets to a host, not all of them are and filtering
* excluded addresses has a negative impact on those uses.
*/
#define dns64_bis_return_excluded_addresses 1
#endif
/*% Partial answer? */
#define PARTIALANSWER(c) (((c)->query.attributes & \
NS_QUERYATTR_PARTIALANSWER) != 0)
/*% Use Cache? */
#define USECACHE(c) (((c)->query.attributes & \
NS_QUERYATTR_CACHEOK) != 0)
/*% Recursion OK? */
#define RECURSIONOK(c) (((c)->query.attributes & \
NS_QUERYATTR_RECURSIONOK) != 0)
/*% Recursing? */
#define RECURSING(c) (((c)->query.attributes & \
NS_QUERYATTR_RECURSING) != 0)
/*% Cache glue ok? */
#define CACHEGLUEOK(c) (((c)->query.attributes & \
NS_QUERYATTR_CACHEGLUEOK) != 0)
/*% Want Recursion? */
#define WANTRECURSION(c) (((c)->query.attributes & \
NS_QUERYATTR_WANTRECURSION) != 0)
/*% Is TCP? */
#define TCP(c) (((c)->attributes & NS_CLIENTATTR_TCP) != 0)
/*% Want DNSSEC? */
#define WANTDNSSEC(c) (((c)->attributes & \
NS_CLIENTATTR_WANTDNSSEC) != 0)
/*% Want WANTAD? */
#define WANTAD(c) (((c)->attributes & \
NS_CLIENTATTR_WANTAD) != 0)
/*% Client presented a valid COOKIE. */
#define HAVECOOKIE(c) (((c)->attributes & \
NS_CLIENTATTR_HAVECOOKIE) != 0)
/*% Client presented a COOKIE. */
#define WANTCOOKIE(c) (((c)->attributes & \
NS_CLIENTATTR_WANTCOOKIE) != 0)
/*% No authority? */
#define NOAUTHORITY(c) (((c)->query.attributes & \
NS_QUERYATTR_NOAUTHORITY) != 0)
/*% No additional? */
#define NOADDITIONAL(c) (((c)->query.attributes & \
NS_QUERYATTR_NOADDITIONAL) != 0)
/*% Secure? */
#define SECURE(c) (((c)->query.attributes & \
NS_QUERYATTR_SECURE) != 0)
/*% DNS64 A lookup? */
#define DNS64(c) (((c)->query.attributes & \
NS_QUERYATTR_DNS64) != 0)
#define DNS64EXCLUDE(c) (((c)->query.attributes & \
NS_QUERYATTR_DNS64EXCLUDE) != 0)
#define REDIRECT(c) (((c)->query.attributes & \
NS_QUERYATTR_REDIRECT) != 0)
/*% No QNAME Proof? */
#define NOQNAME(r) (((r)->attributes & \
DNS_RDATASETATTR_NOQNAME) != 0)
#ifdef WANT_QUERYTRACE
static inline void
client_trace(ns_client_t *client, int level, const char *message) {
if (client != NULL && client->query.qname != NULL) {
if (isc_log_wouldlog(ns_g_lctx, level)) {
char qbuf[DNS_NAME_FORMATSIZE];
char tbuf[DNS_RDATATYPE_FORMATSIZE];
dns_name_format(client->query.qname,
qbuf, sizeof(qbuf));
dns_rdatatype_format(client->query.qtype,
tbuf, sizeof(tbuf));
isc_log_write(ns_g_lctx,
NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY, level,
"query client=%p thread=0x%lx "
"(%s/%s): %s",
client,
(unsigned long) isc_thread_self(),
qbuf, tbuf, message);
}
} else {
isc_log_write(ns_g_lctx,
NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY, level,
"query client=%p thread=0x%lx "
"(<unknown-query>): %s",
client,
(unsigned long) isc_thread_self(),
message);
}
}
#define CTRACE(l,m) client_trace(client, l, m)
#else
#define CTRACE(l,m) ((void)m)
#endif /* WANT_QUERYTRACE */
#define DNS_GETDB_NOEXACT 0x01U
#define DNS_GETDB_NOLOG 0x02U
#define DNS_GETDB_PARTIAL 0x04U
#define DNS_GETDB_IGNOREACL 0x08U
#define PENDINGOK(x) (((x) & DNS_DBFIND_PENDINGOK) != 0)
#define SFCACHE_CDFLAG 0x1
/*
* These have the same semantics as:
*
* foo_attach(b, a);
* foo_detach(&a);
*
* without the locking and magic testing.
*
* We use SAVE and RESTORE as that shows the operation being performed.
*/
#define SAVE(a, b) do { INSIST(a == NULL); a = b; b = NULL; } while (0)
#define RESTORE(a, b) SAVE(a, b)
typedef struct client_additionalctx {
ns_client_t *client;
dns_rdataset_t *rdataset;
} client_additionalctx_t;
static isc_result_t
query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype);
static bool
validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
static void
query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
dns_dbversion_t *version, ns_client_t *client,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
dns_name_t *fname, bool exact,
dns_name_t *found);
static inline void
log_queryerror(ns_client_t *client, isc_result_t result, int line, int level);
static void
rpz_st_clear(ns_client_t *client);
static bool
rpz_ck_dnssec(ns_client_t *client, isc_result_t qresult,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
/*%
* Increment query statistics counters.
*/
static inline void
inc_stats(ns_client_t *client, isc_statscounter_t counter) {
dns_zone_t *zone = client->query.authzone;
dns_rdatatype_t qtype;
dns_rdataset_t *rdataset;
isc_stats_t *zonestats;
dns_stats_t *querystats = NULL;
isc_stats_increment(ns_g_server->nsstats, counter);
if (zone == NULL)
return;
/* Do regular response type stats */
zonestats = dns_zone_getrequeststats(zone);
if (zonestats != NULL)
isc_stats_increment(zonestats, counter);
/* Do query type statistics
*
* We only increment per-type if we're using the authoritative
* answer counter, preventing double-counting.
*/
if (counter == dns_nsstatscounter_authans) {
querystats = dns_zone_getrcvquerystats(zone);
if (querystats != NULL) {
rdataset = ISC_LIST_HEAD(client->query.qname->list);
if (rdataset != NULL) {
qtype = rdataset->type;
dns_rdatatypestats_increment(querystats, qtype);
}
}
}
}
static void
query_send(ns_client_t *client) {
isc_statscounter_t counter;
if ((client->message->flags & DNS_MESSAGEFLAG_AA) == 0)
inc_stats(client, dns_nsstatscounter_nonauthans);
else
inc_stats(client, dns_nsstatscounter_authans);
if (client->message->rcode == dns_rcode_noerror) {
dns_section_t answer = DNS_SECTION_ANSWER;
if (ISC_LIST_EMPTY(client->message->sections[answer])) {
if (client->query.isreferral)
counter = dns_nsstatscounter_referral;
else
counter = dns_nsstatscounter_nxrrset;
} else
counter = dns_nsstatscounter_success;
} else if (client->message->rcode == dns_rcode_nxdomain)
counter = dns_nsstatscounter_nxdomain;
else if (client->message->rcode == dns_rcode_badcookie)
counter = dns_nsstatscounter_badcookie;
else /* We end up here in case of YXDOMAIN, and maybe others */
counter = dns_nsstatscounter_failure;
inc_stats(client, counter);
ns_client_send(client);
}
static void
query_error(ns_client_t *client, isc_result_t result, int line) {
int loglevel = ISC_LOG_DEBUG(3);
switch (result) {
case DNS_R_SERVFAIL:
loglevel = ISC_LOG_DEBUG(1);
inc_stats(client, dns_nsstatscounter_servfail);
break;
case DNS_R_FORMERR:
inc_stats(client, dns_nsstatscounter_formerr);
break;
default:
inc_stats(client, dns_nsstatscounter_failure);
break;
}
if (ns_g_server->log_queries)
loglevel = ISC_LOG_INFO;
log_queryerror(client, result, line, loglevel);
ns_client_error(client, result);
}
static void
query_next(ns_client_t *client, isc_result_t result) {
if (result == DNS_R_DUPLICATE)
inc_stats(client, dns_nsstatscounter_duplicate);
else if (result == DNS_R_DROP)
inc_stats(client, dns_nsstatscounter_dropped);
else
inc_stats(client, dns_nsstatscounter_failure);
ns_client_next(client, result);
}
static inline void
query_freefreeversions(ns_client_t *client, bool everything) {
ns_dbversion_t *dbversion, *dbversion_next;
unsigned int i;
for (dbversion = ISC_LIST_HEAD(client->query.freeversions), i = 0;
dbversion != NULL;
dbversion = dbversion_next, i++)
{
dbversion_next = ISC_LIST_NEXT(dbversion, link);
/*
* If we're not freeing everything, we keep the first three
* dbversions structures around.
*/
if (i > 3 || everything) {
ISC_LIST_UNLINK(client->query.freeversions, dbversion,
link);
isc_mem_put(client->mctx, dbversion,
sizeof(*dbversion));
}
}
}
void
ns_query_cancel(ns_client_t *client) {
REQUIRE(NS_CLIENT_VALID(client));
LOCK(&client->query.fetchlock);
if (client->query.fetch != NULL) {
dns_resolver_cancelfetch(client->query.fetch);
client->query.fetch = NULL;
}
UNLOCK(&client->query.fetchlock);
}
static inline void
query_putrdataset(ns_client_t *client, dns_rdataset_t **rdatasetp) {
dns_rdataset_t *rdataset = *rdatasetp;
CTRACE(ISC_LOG_DEBUG(3), "query_putrdataset");
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, rdatasetp);
}
CTRACE(ISC_LOG_DEBUG(3), "query_putrdataset: done");
}
static inline void
query_reset(ns_client_t *client, bool everything) {
isc_buffer_t *dbuf, *dbuf_next;
ns_dbversion_t *dbversion, *dbversion_next;
CTRACE(ISC_LOG_DEBUG(3), "query_reset");
/*%
* Reset the query state of a client to its default state.
*/
/*
* Cancel the fetch if it's running.
*/
ns_query_cancel(client);
/*
* Cleanup any active versions.
*/
for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
dbversion != NULL;
dbversion = dbversion_next) {
dbversion_next = ISC_LIST_NEXT(dbversion, link);
dns_db_closeversion(dbversion->db, &dbversion->version,
false);
dns_db_detach(&dbversion->db);
ISC_LIST_INITANDAPPEND(client->query.freeversions,
dbversion, link);
}
ISC_LIST_INIT(client->query.activeversions);
if (client->query.authdb != NULL)
dns_db_detach(&client->query.authdb);
if (client->query.authzone != NULL)
dns_zone_detach(&client->query.authzone);
if (client->query.dns64_aaaa != NULL)
query_putrdataset(client, &client->query.dns64_aaaa);
if (client->query.dns64_sigaaaa != NULL)
query_putrdataset(client, &client->query.dns64_sigaaaa);
if (client->query.dns64_aaaaok != NULL) {
isc_mem_put(client->mctx, client->query.dns64_aaaaok,
client->query.dns64_aaaaoklen *
sizeof(bool));
client->query.dns64_aaaaok = NULL;
client->query.dns64_aaaaoklen = 0;
}
query_putrdataset(client, &client->query.redirect.rdataset);
query_putrdataset(client, &client->query.redirect.sigrdataset);
if (client->query.redirect.db != NULL) {
if (client->query.redirect.node != NULL)
dns_db_detachnode(client->query.redirect.db,
&client->query.redirect.node);
dns_db_detach(&client->query.redirect.db);
}
if (client->query.redirect.zone != NULL)
dns_zone_detach(&client->query.redirect.zone);
query_freefreeversions(client, everything);
for (dbuf = ISC_LIST_HEAD(client->query.namebufs);
dbuf != NULL;
dbuf = dbuf_next) {
dbuf_next = ISC_LIST_NEXT(dbuf, link);
if (dbuf_next != NULL || everything) {
ISC_LIST_UNLINK(client->query.namebufs, dbuf, link);
isc_buffer_free(&dbuf);
}
}
if (client->query.restarts > 0) {
/*
* client->query.qname was dynamically allocated.
*/
dns_message_puttempname(client->message,
&client->query.qname);
}
client->query.qname = NULL;
client->query.attributes = (NS_QUERYATTR_RECURSIONOK |
NS_QUERYATTR_CACHEOK |
NS_QUERYATTR_SECURE);
client->query.restarts = 0;
client->query.timerset = false;
if (client->query.rpz_st != NULL) {
rpz_st_clear(client);
if (everything) {
isc_mem_put(client->mctx, client->query.rpz_st,
sizeof(*client->query.rpz_st));
client->query.rpz_st = NULL;
}
}
client->query.origqname = NULL;
client->query.dboptions = 0;
client->query.fetchoptions = 0;
client->query.gluedb = NULL;
client->query.authdbset = false;
client->query.isreferral = false;
client->query.dns64_options = 0;
client->query.dns64_ttl = UINT32_MAX;
client->query.root_key_sentinel_keyid = 0;
client->query.root_key_sentinel_is_ta = false;
client->query.root_key_sentinel_not_ta = false;
}
static void
query_next_callback(ns_client_t *client) {
query_reset(client, false);
}
void
ns_query_free(ns_client_t *client) {
REQUIRE(NS_CLIENT_VALID(client));
query_reset(client, true);
}
static inline isc_result_t
query_newnamebuf(ns_client_t *client) {
isc_buffer_t *dbuf;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "query_newnamebuf");
/*%
* Allocate a name buffer.
*/
dbuf = NULL;
result = isc_buffer_allocate(client->mctx, &dbuf, 1024);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_newnamebuf: isc_buffer_allocate failed: done");
return (result);
}
ISC_LIST_APPEND(client->query.namebufs, dbuf, link);
CTRACE(ISC_LOG_DEBUG(3), "query_newnamebuf: done");
return (ISC_R_SUCCESS);
}
static inline isc_buffer_t *
query_getnamebuf(ns_client_t *client) {
isc_buffer_t *dbuf;
isc_result_t result;
isc_region_t r;
CTRACE(ISC_LOG_DEBUG(3), "query_getnamebuf");
/*%
* Return a name buffer with space for a maximal name, allocating
* a new one if necessary.
*/
if (ISC_LIST_EMPTY(client->query.namebufs)) {
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_getnamebuf: query_newnamebuf failed: done");
return (NULL);
}
}
dbuf = ISC_LIST_TAIL(client->query.namebufs);
INSIST(dbuf != NULL);
isc_buffer_availableregion(dbuf, &r);
if (r.length < DNS_NAME_MAXWIRE) {
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_getnamebuf: query_newnamebuf failed: done");
return (NULL);
}
dbuf = ISC_LIST_TAIL(client->query.namebufs);
isc_buffer_availableregion(dbuf, &r);
INSIST(r.length >= 255);
}
CTRACE(ISC_LOG_DEBUG(3), "query_getnamebuf: done");
return (dbuf);
}
static inline void
query_keepname(ns_client_t *client, dns_name_t *name, isc_buffer_t *dbuf) {
isc_region_t r;
CTRACE(ISC_LOG_DEBUG(3), "query_keepname");
/*%
* 'name' is using space in 'dbuf', but 'dbuf' has not yet been
* adjusted to take account of that. We do the adjustment.
*/
REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) != 0);
dns_name_toregion(name, &r);
isc_buffer_add(dbuf, r.length);
dns_name_setbuffer(name, NULL);
client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
}
static inline void
query_releasename(ns_client_t *client, dns_name_t **namep) {
dns_name_t *name = *namep;
/*%
* 'name' is no longer needed. Return it to our pool of temporary
* names. If it is using a name buffer, relinquish its exclusive
* rights on the buffer.
*/
CTRACE(ISC_LOG_DEBUG(3), "query_releasename");
if (dns_name_hasbuffer(name)) {
INSIST((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED)
!= 0);
client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
}
dns_message_puttempname(client->message, namep);
CTRACE(ISC_LOG_DEBUG(3), "query_releasename: done");
}
static inline dns_name_t *
query_newname(ns_client_t *client, isc_buffer_t *dbuf,
isc_buffer_t *nbuf)
{
dns_name_t *name;
isc_region_t r;
isc_result_t result;
REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) == 0);
CTRACE(ISC_LOG_DEBUG(3), "query_newname");
name = NULL;
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_newname: dns_message_gettempname failed: done");
return (NULL);
}
isc_buffer_availableregion(dbuf, &r);
isc_buffer_init(nbuf, r.base, r.length);
dns_name_init(name, NULL);
dns_name_setbuffer(name, nbuf);
client->query.attributes |= NS_QUERYATTR_NAMEBUFUSED;
CTRACE(ISC_LOG_DEBUG(3), "query_newname: done");
return (name);
}
static inline dns_rdataset_t *
query_newrdataset(ns_client_t *client) {
dns_rdataset_t *rdataset;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "query_newrdataset");
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_newrdataset: "
"dns_message_gettemprdataset failed: done");
return (NULL);
}
CTRACE(ISC_LOG_DEBUG(3), "query_newrdataset: done");
return (rdataset);
}
static inline isc_result_t
query_newdbversion(ns_client_t *client, unsigned int n) {
unsigned int i;
ns_dbversion_t *dbversion;
for (i = 0; i < n; i++) {
dbversion = isc_mem_get(client->mctx, sizeof(*dbversion));
if (dbversion != NULL) {
dbversion->db = NULL;
dbversion->version = NULL;
ISC_LIST_INITANDAPPEND(client->query.freeversions,
dbversion, link);
} else {
/*
* We only return ISC_R_NOMEMORY if we couldn't
* allocate anything.
*/
if (i == 0)
return (ISC_R_NOMEMORY);
else
return (ISC_R_SUCCESS);
}
}
return (ISC_R_SUCCESS);
}
static inline ns_dbversion_t *
query_getdbversion(ns_client_t *client) {
isc_result_t result;
ns_dbversion_t *dbversion;
if (ISC_LIST_EMPTY(client->query.freeversions)) {
result = query_newdbversion(client, 1);
if (result != ISC_R_SUCCESS)
return (NULL);
}
dbversion = ISC_LIST_HEAD(client->query.freeversions);
INSIST(dbversion != NULL);
ISC_LIST_UNLINK(client->query.freeversions, dbversion, link);
return (dbversion);
}
isc_result_t
ns_query_init(ns_client_t *client) {
isc_result_t result;
REQUIRE(NS_CLIENT_VALID(client));
ISC_LIST_INIT(client->query.namebufs);
ISC_LIST_INIT(client->query.activeversions);
ISC_LIST_INIT(client->query.freeversions);
client->query.restarts = 0;
client->query.timerset = false;
client->query.rpz_st = NULL;
client->query.qname = NULL;
/*
* This mutex is destroyed when the client is destroyed in
* exit_check().
*/
result = isc_mutex_init(&client->query.fetchlock);
if (result != ISC_R_SUCCESS)
return (result);
client->query.fetch = NULL;
client->query.prefetch = NULL;
client->query.authdb = NULL;
client->query.authzone = NULL;
client->query.authdbset = false;
client->query.isreferral = false;
client->query.dns64_aaaa = NULL;
client->query.dns64_sigaaaa = NULL;
client->query.dns64_aaaaok = NULL;
client->query.dns64_aaaaoklen = 0;
client->query.redirect.db = NULL;
client->query.redirect.node = NULL;
client->query.redirect.zone = NULL;
client->query.redirect.qtype = dns_rdatatype_none;
client->query.redirect.result = ISC_R_SUCCESS;
client->query.redirect.rdataset = NULL;
client->query.redirect.sigrdataset = NULL;
client->query.redirect.authoritative = false;
client->query.redirect.is_zone = false;
client->query.redirect.fname =
dns_fixedname_initname(&client->query.redirect.fixed);
query_reset(client, false);
result = query_newdbversion(client, 3);
if (result != ISC_R_SUCCESS) {
DESTROYLOCK(&client->query.fetchlock);
return (result);
}
result = query_newnamebuf(client);
if (result != ISC_R_SUCCESS) {
query_freefreeversions(client, true);
DESTROYLOCK(&client->query.fetchlock);
}
return (result);
}
static ns_dbversion_t *
query_findversion(ns_client_t *client, dns_db_t *db) {
ns_dbversion_t *dbversion;
/*%
* We may already have done a query related to this
* database. If so, we must be sure to make subsequent
* queries from the same version.
*/
for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
dbversion != NULL;
dbversion = ISC_LIST_NEXT(dbversion, link)) {
if (dbversion->db == db)
break;
}
if (dbversion == NULL) {
/*
* This is a new zone for this query. Add it to
* the active list.
*/
dbversion = query_getdbversion(client);
if (dbversion == NULL)
return (NULL);
dns_db_attach(db, &dbversion->db);
dns_db_currentversion(db, &dbversion->version);
dbversion->acl_checked = false;
dbversion->queryok = false;
ISC_LIST_APPEND(client->query.activeversions,
dbversion, link);
}
return (dbversion);
}
static inline isc_result_t
query_validatezonedb(ns_client_t *client, dns_name_t *name,
dns_rdatatype_t qtype, unsigned int options,
dns_zone_t *zone, dns_db_t *db,
dns_dbversion_t **versionp)
{
isc_result_t result;
dns_acl_t *queryacl, *queryonacl;
ns_dbversion_t *dbversion;
REQUIRE(zone != NULL);
REQUIRE(db != NULL);
/*
* This limits our searching to the zone where the first name
* (the query target) was looked for. This prevents following
* CNAMES or DNAMES into other zones and prevents returning
* additional data from other zones.
*/
if (!client->view->additionalfromauth &&
client->query.authdbset &&
db != client->query.authdb)
return (DNS_R_REFUSED);
/*
* Non recursive query to a static-stub zone is prohibited; its
* zone content is not public data, but a part of local configuration
* and should not be disclosed.
*/
if (dns_zone_gettype(zone) == dns_zone_staticstub &&
!RECURSIONOK(client)) {
return (DNS_R_REFUSED);
}
/*
* If the zone has an ACL, we'll check it, otherwise
* we use the view's "allow-query" ACL. Each ACL is only checked
* once per query.
*
* Also, get the database version to use.
*/
/*
* Get the current version of this database.
*/
dbversion = query_findversion(client, db);
if (dbversion == NULL) {
CTRACE(ISC_LOG_ERROR, "unable to get db version");
return (DNS_R_SERVFAIL);
}
if ((options & DNS_GETDB_IGNOREACL) != 0)
goto approved;
if (dbversion->acl_checked) {
if (!dbversion->queryok)
return (DNS_R_REFUSED);
goto approved;
}
queryacl = dns_zone_getqueryacl(zone);
if (queryacl == NULL) {
queryacl = client->view->queryacl;
if ((client->query.attributes &
NS_QUERYATTR_QUERYOKVALID) != 0) {
/*
* We've evaluated the view's queryacl already. If
* NS_QUERYATTR_QUERYOK is set, then the client is
* allowed to make queries, otherwise the query should
* be refused.
*/
dbversion->acl_checked = true;
if ((client->query.attributes &
NS_QUERYATTR_QUERYOK) == 0) {
dbversion->queryok = false;
return (DNS_R_REFUSED);
}
dbversion->queryok = true;
goto approved;
}
}
result = ns_client_checkaclsilent(client, NULL, queryacl, true);
if ((options & DNS_GETDB_NOLOG) == 0) {
char msg[NS_CLIENT_ACLMSGSIZE("query")];
if (result == ISC_R_SUCCESS) {
if (isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(3))) {
ns_client_aclmsg("query", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client,
DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(3),
"%s approved", msg);
}
} else {
ns_client_aclmsg("query", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"%s denied", msg);
}
}
if (queryacl == client->view->queryacl) {
if (result == ISC_R_SUCCESS) {
/*
* We were allowed by the default
* "allow-query" ACL. Remember this so we
* don't have to check again.
*/
client->query.attributes |= NS_QUERYATTR_QUERYOK;
}
/*
* We've now evaluated the view's query ACL, and
* the NS_QUERYATTR_QUERYOK attribute is now valid.
*/
client->query.attributes |= NS_QUERYATTR_QUERYOKVALID;
}
/* If and only if we've gotten this far, check allow-query-on too */
if (result == ISC_R_SUCCESS) {
queryonacl = dns_zone_getqueryonacl(zone);
if (queryonacl == NULL)
queryonacl = client->view->queryonacl;
result = ns_client_checkaclsilent(client, &client->destaddr,
queryonacl, true);
if ((options & DNS_GETDB_NOLOG) == 0 &&
result != ISC_R_SUCCESS)
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"query-on denied");
}
dbversion->acl_checked = true;
if (result != ISC_R_SUCCESS) {
dbversion->queryok = false;
return (DNS_R_REFUSED);
}
dbversion->queryok = true;
approved:
/* Transfer ownership, if necessary. */
if (versionp != NULL)
*versionp = dbversion->version;
return (ISC_R_SUCCESS);
}
static inline isc_result_t
query_getzonedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp)
{
isc_result_t result;
unsigned int ztoptions;
dns_zone_t *zone = NULL;
dns_db_t *db = NULL;
bool partial = false;
REQUIRE(zonep != NULL && *zonep == NULL);
REQUIRE(dbp != NULL && *dbp == NULL);
/*%
* Find a zone database to answer the query.
*/
ztoptions = ((options & DNS_GETDB_NOEXACT) != 0) ?
DNS_ZTFIND_NOEXACT : 0;
result = dns_zt_find(client->view->zonetable, name, ztoptions, NULL,
&zone);
if (result == DNS_R_PARTIALMATCH)
partial = true;
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
result = dns_zone_getdb(zone, &db);
if (result != ISC_R_SUCCESS)
goto fail;
result = query_validatezonedb(client, name, qtype, options, zone, db,
versionp);
if (result != ISC_R_SUCCESS)
goto fail;
/* Transfer ownership. */
*zonep = zone;
*dbp = db;
if (partial && (options & DNS_GETDB_PARTIAL) != 0)
return (DNS_R_PARTIALMATCH);
return (ISC_R_SUCCESS);
fail:
if (zone != NULL)
dns_zone_detach(&zone);
if (db != NULL)
dns_db_detach(&db);
return (result);
}
static void
rpz_log_rewrite(ns_client_t *client, bool disabled,
dns_rpz_policy_t policy, dns_rpz_type_t type,
dns_zone_t *p_zone, dns_name_t *p_name,
dns_name_t *cname, dns_rpz_num_t rpz_num)
{
char cname_buf[DNS_NAME_FORMATSIZE] = { 0 };
char p_name_buf[DNS_NAME_FORMATSIZE];
char qname_buf[DNS_NAME_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
const char *s1 = cname_buf, *s2 = cname_buf;
dns_rdataset_t *rdataset;
dns_rpz_st_t *st;
isc_stats_t *zonestats;
/*
* Count enabled rewrites in the global counter.
* Count both enabled and disabled rewrites for each zone.
*/
if (!disabled && policy != DNS_RPZ_POLICY_PASSTHRU) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_rpz_rewrites);
}
if (p_zone != NULL) {
zonestats = dns_zone_getrequeststats(p_zone);
if (zonestats != NULL)
isc_stats_increment(zonestats,
dns_nsstatscounter_rpz_rewrites);
}
if (!isc_log_wouldlog(ns_g_lctx, DNS_RPZ_INFO_LEVEL))
return;
st = client->query.rpz_st;
if ((st->popt.no_log & DNS_RPZ_ZBIT(rpz_num)) != 0)
return;
dns_name_format(client->query.qname, qname_buf, sizeof(qname_buf));
dns_name_format(p_name, p_name_buf, sizeof(p_name_buf));
if (cname != NULL) {
s1 = " (CNAME to: ";
dns_name_format(cname, cname_buf, sizeof(cname_buf));
s2 = ")";
}
/*
* Log Qclass and Qtype in addition to existing
* fields.
*/
rdataset = ISC_LIST_HEAD(client->query.origqname->list);
INSIST(rdataset != NULL);
dns_rdataclass_format(rdataset->rdclass, classbuf, sizeof(classbuf));
dns_rdatatype_format(rdataset->type, typebuf, sizeof(typebuf));
ns_client_log(client, DNS_LOGCATEGORY_RPZ, NS_LOGMODULE_QUERY,
DNS_RPZ_INFO_LEVEL,
#ifdef RPZ_LOG_QTYPE_QCLASS
"%srpz %s %s rewrite %s/%s/%s via %s%s%s%s",
#else /* RPZ_LOG_QTYPE_QCLASS */
"%srpz %s %s rewrite %s via %s%s%s%s",
#endif /* RPZ_LOG_QTYPE_QCLASS */
disabled ? "disabled " : "",
dns_rpz_type2str(type), dns_rpz_policy2str(policy),
qname_buf,
#ifdef RPZ_LOG_QTYPE_QCLASS
typebuf, classbuf,
#endif /* RPZ_LOG_QTYPE_QCLASS */
p_name_buf, s1, cname_buf, s2);
}
static void
rpz_log_fail_helper(ns_client_t *client, int level, dns_name_t *p_name,
dns_rpz_type_t rpz_type1, dns_rpz_type_t rpz_type2,
const char *str, isc_result_t result)
{
char qnamebuf[DNS_NAME_FORMATSIZE];
char p_namebuf[DNS_NAME_FORMATSIZE];
const char *failed;
const char *slash;
const char *via;
const char *str_blank;
const char *rpztypestr1;
const char *rpztypestr2;
if (!isc_log_wouldlog(ns_g_lctx, level))
return;
/*
* bin/tests/system/rpz/tests.sh looks for "rpz.*failed" for problems.
*/
if (level <= DNS_RPZ_DEBUG_LEVEL1)
failed = "failed: ";
else
failed = ": ";
rpztypestr1 = dns_rpz_type2str(rpz_type1);
if (rpz_type2 != DNS_RPZ_TYPE_BAD) {
slash = "/";
rpztypestr2 = dns_rpz_type2str(rpz_type2);
} else {
slash = "";
rpztypestr2 = "";
}
str_blank = (*str != ' ' && *str != '\0') ? " " : "";
dns_name_format(client->query.qname, qnamebuf, sizeof(qnamebuf));
if (p_name != NULL) {
via = " via ";
dns_name_format(p_name, p_namebuf, sizeof(p_namebuf));
} else {
via = "";
p_namebuf[0] = '\0';
}
ns_client_log(client, NS_LOGCATEGORY_QUERY_ERRORS,
NS_LOGMODULE_QUERY, level,
"rpz %s%s%s rewrite %s%s%s%s%s%s : %s",
rpztypestr1, slash, rpztypestr2,
qnamebuf, via, p_namebuf, str_blank,
str, failed, isc_result_totext(result));
}
static void
rpz_log_fail(ns_client_t *client, int level, dns_name_t *p_name,
dns_rpz_type_t rpz_type, const char *str, isc_result_t result)
{
rpz_log_fail_helper(client, level, p_name,
rpz_type, DNS_RPZ_TYPE_BAD, str, result);
}
/*
* Get a policy rewrite zone database.
*/
static isc_result_t
rpz_getdb(ns_client_t *client, dns_name_t *p_name, dns_rpz_type_t rpz_type,
dns_zone_t **zonep, dns_db_t **dbp, dns_dbversion_t **versionp)
{
char qnamebuf[DNS_NAME_FORMATSIZE];
char p_namebuf[DNS_NAME_FORMATSIZE];
dns_dbversion_t *rpz_version = NULL;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_getdb");
result = query_getzonedb(client, p_name, dns_rdatatype_any,
DNS_GETDB_IGNOREACL, zonep, dbp, &rpz_version);
if (result == ISC_R_SUCCESS) {
dns_rpz_st_t *st = client->query.rpz_st;
/*
* It isn't meaningful to log this message when
* logging is disabled for some policy zones.
*/
if (st->popt.no_log == 0 &&
isc_log_wouldlog(ns_g_lctx, DNS_RPZ_DEBUG_LEVEL2))
{
dns_name_format(client->query.qname, qnamebuf,
sizeof(qnamebuf));
dns_name_format(p_name, p_namebuf, sizeof(p_namebuf));
ns_client_log(client, DNS_LOGCATEGORY_RPZ,
NS_LOGMODULE_QUERY, DNS_RPZ_DEBUG_LEVEL2,
"try rpz %s rewrite %s via %s",
dns_rpz_type2str(rpz_type),
qnamebuf, p_namebuf);
}
*versionp = rpz_version;
return (ISC_R_SUCCESS);
}
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, p_name, rpz_type,
" query_getzonedb()", result);
return (result);
}
static inline isc_result_t
query_getcachedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
dns_db_t **dbp, unsigned int options)
{
isc_result_t result;
bool check_acl;
dns_db_t *db = NULL;
REQUIRE(dbp != NULL && *dbp == NULL);
/*%
* Find a cache database to answer the query.
* This may fail with DNS_R_REFUSED if the client
* is not allowed to use the cache.
*/
if (!USECACHE(client))
return (DNS_R_REFUSED);
dns_db_attach(client->view->cachedb, &db);
if ((client->query.attributes & NS_QUERYATTR_CACHEACLOKVALID) != 0) {
/*
* We've evaluated the view's cacheacl already. If
* NS_QUERYATTR_CACHEACLOK is set, then the client is
* allowed to make queries, otherwise the query should
* be refused.
*/
check_acl = false;
if ((client->query.attributes & NS_QUERYATTR_CACHEACLOK) == 0)
goto refuse;
} else {
/*
* We haven't evaluated the view's queryacl yet.
*/
check_acl = true;
}
if (check_acl) {
bool log = !(options & DNS_GETDB_NOLOG);
char msg[NS_CLIENT_ACLMSGSIZE("query (cache)")];
result = ns_client_checkaclsilent(client, NULL,
client->view->cacheacl,
true);
if (result == ISC_R_SUCCESS) {
/*
* We were allowed by the "allow-query-cache" ACL.
* Remember this so we don't have to check again.
*/
client->query.attributes |=
NS_QUERYATTR_CACHEACLOK;
if (log && isc_log_wouldlog(ns_g_lctx,
ISC_LOG_DEBUG(3)))
{
ns_client_aclmsg("query (cache)", name, qtype,
client->view->rdclass,
msg, sizeof(msg));
ns_client_log(client,
DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(3),
"%s approved", msg);
}
} else if (log) {
ns_client_aclmsg("query (cache)", name, qtype,
client->view->rdclass, msg,
sizeof(msg));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"%s denied", msg);
}
/*
* We've now evaluated the view's query ACL, and
* the NS_QUERYATTR_CACHEACLOKVALID attribute is now valid.
*/
client->query.attributes |= NS_QUERYATTR_CACHEACLOKVALID;
if (result != ISC_R_SUCCESS)
goto refuse;
}
/* Approved. */
/* Transfer ownership. */
*dbp = db;
return (ISC_R_SUCCESS);
refuse:
result = DNS_R_REFUSED;
if (db != NULL)
dns_db_detach(&db);
return (result);
}
static inline isc_result_t
query_getdb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp, bool *is_zonep)
{
isc_result_t result;
isc_result_t tresult;
unsigned int namelabels;
unsigned int zonelabels;
dns_zone_t *zone = NULL;
REQUIRE(zonep != NULL && *zonep == NULL);
/* Calculate how many labels are in name. */
namelabels = dns_name_countlabels(name);
zonelabels = 0;
/* Try to find name in bind's standard database. */
result = query_getzonedb(client, name, qtype, options, &zone,
dbp, versionp);
/* See how many labels are in the zone's name. */
if (result == ISC_R_SUCCESS && zone != NULL)
zonelabels = dns_name_countlabels(dns_zone_getorigin(zone));
/*
* If # zone labels < # name labels, try to find an even better match
* Only try if DLZ drivers are loaded for this view
*/
if (ISC_UNLIKELY(zonelabels < namelabels &&
!ISC_LIST_EMPTY(client->view->dlz_searched)))
{
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_db_t *tdbp;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
tdbp = NULL;
tresult = dns_view_searchdlz(client->view, name,
zonelabels, &cm, &ci, &tdbp);
/* If we successful, we found a better match. */
if (tresult == ISC_R_SUCCESS) {
ns_dbversion_t *dbversion;
/*
* If the previous search returned a zone, detach it.
*/
if (zone != NULL)
dns_zone_detach(&zone);
/*
* If the previous search returned a database,
* detach it.
*/
if (*dbp != NULL)
dns_db_detach(dbp);
/*
* If the previous search returned a version, clear it.
*/
*versionp = NULL;
dbversion = query_findversion(client, tdbp);
if (dbversion == NULL) {
tresult = ISC_R_NOMEMORY;
} else {
/*
* Be sure to return our database.
*/
*dbp = tdbp;
*versionp = dbversion->version;
}
/*
* We return a null zone, No stats for DLZ zones.
*/
zone = NULL;
result = tresult;
}
}
/* If successful, Transfer ownership of zone. */
if (result == ISC_R_SUCCESS) {
*zonep = zone;
/*
* If neither attempt above succeeded, return the cache instead
*/
*is_zonep = true;
} else if (result == ISC_R_NOTFOUND) {
result = query_getcachedb(client, name, qtype, dbp, options);
*is_zonep = false;
}
return (result);
}
static inline bool
query_isduplicate(ns_client_t *client, dns_name_t *name,
dns_rdatatype_t type, dns_name_t **mnamep)
{
dns_section_t section;
dns_name_t *mname = NULL;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "query_isduplicate");
for (section = DNS_SECTION_ANSWER;
section <= DNS_SECTION_ADDITIONAL;
section++) {
result = dns_message_findname(client->message, section,
name, type, 0, &mname, NULL);
if (result == ISC_R_SUCCESS) {
/*
* We've already got this RRset in the response.
*/
CTRACE(ISC_LOG_DEBUG(3),
"query_isduplicate: true: done");
return (true);
} else if (result == DNS_R_NXRRSET) {
/*
* The name exists, but the rdataset does not.
*/
if (section == DNS_SECTION_ADDITIONAL)
break;
} else
RUNTIME_CHECK(result == DNS_R_NXDOMAIN);
mname = NULL;
}
if (mnamep != NULL)
*mnamep = mname;
CTRACE(ISC_LOG_DEBUG(3), "query_isduplicate: false: done");
return (false);
}
static isc_result_t
query_addadditional(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
ns_client_t *client = arg;
isc_result_t result, eresult;
dns_dbnode_t *node;
dns_db_t *db;
dns_name_t *fname, *mname;
dns_rdataset_t *rdataset, *sigrdataset, *trdataset;
isc_buffer_t *dbuf;
isc_buffer_t b;
dns_dbversion_t *version;
bool added_something, need_addname;
dns_zone_t *zone;
dns_rdatatype_t type;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_rdatasetadditional_t additionaltype;
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(qtype != dns_rdatatype_any);
if (!WANTDNSSEC(client) && dns_rdatatype_isdnssec(qtype))
return (ISC_R_SUCCESS);
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
trdataset = NULL;
db = NULL;
version = NULL;
node = NULL;
added_something = false;
need_addname = false;
zone = NULL;
additionaltype = dns_rdatasetadditional_fromauth;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* We treat type A additional section processing as if it
* were "any address type" additional section processing.
* To avoid multiple lookups, we do an 'any' database
* lookup and iterate over the node.
*/
if (qtype == dns_rdatatype_a)
type = dns_rdatatype_any;
else
type = qtype;
/*
* Get some resources.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL)
goto cleanup;
if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
/*
* Look for a zone database that might contain authoritative
* additional data.
*/
result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
&zone, &db, &version);
if (result != ISC_R_SUCCESS)
goto try_cache;
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional: db_find");
/*
* Since we are looking for authoritative data, we do not set
* the GLUEOK flag. Glue will be looked for later, but not
* necessarily in the same database.
*/
result = dns_db_findext(db, name, version, type,
client->query.dboptions,
client->now, &node, fname, &cm, &ci,
rdataset, sigrdataset);
if (result == ISC_R_SUCCESS) {
if (sigrdataset != NULL && !dns_db_issecure(db) &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
goto found;
}
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
version = NULL;
dns_db_detach(&db);
/*
* No authoritative data was found. The cache is our next best bet.
*/
try_cache:
additionaltype = dns_rdatasetadditional_fromcache;
result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
if (result != ISC_R_SUCCESS)
/*
* Most likely the client isn't allowed to query the cache.
*/
goto try_glue;
/*
* Attempt to validate glue.
*/
if (sigrdataset == NULL) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
result = dns_db_findext(db, name, version, type,
client->query.dboptions |
DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
client->now, &node, fname, &cm, &ci,
rdataset, sigrdataset);
dns_cache_updatestats(client->view->cache, result);
if (!WANTDNSSEC(client))
query_putrdataset(client, &sigrdataset);
if (result == ISC_R_SUCCESS)
goto found;
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
try_glue:
/*
* No cached data was found. Glue is our last chance.
* RFC1035 sayeth:
*
* NS records cause both the usual additional section
* processing to locate a type A record, and, when used
* in a referral, a special search of the zone in which
* they reside for glue information.
*
* This is the "special search". Note that we must search
* the zone where the NS record resides, not the zone it
* points to, and that we only do the search in the delegation
* case (identified by client->query.gluedb being set).
*/
if (client->query.gluedb == NULL)
goto cleanup;
/*
* Don't poison caches using the bailiwick protection model.
*/
if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
goto cleanup;
dns_db_attach(client->query.gluedb, &db);
additionaltype = dns_rdatasetadditional_fromglue;
result = dns_db_findext(db, name, version, type,
client->query.dboptions | DNS_DBFIND_GLUEOK,
client->now, &node, fname, &cm, &ci,
rdataset, sigrdataset);
if (!(result == ISC_R_SUCCESS ||
result == DNS_R_ZONECUT ||
result == DNS_R_GLUE))
goto cleanup;
found:
/*
* We have found a potential additional data rdataset, or
* at least a node to iterate over.
*/
query_keepname(client, fname, dbuf);
/*
* If we have an rdataset, add it to the additional data
* section.
*/
mname = NULL;
if (dns_rdataset_isassociated(rdataset) &&
!query_isduplicate(client, fname, type, &mname)) {
if (mname != NULL) {
INSIST(mname != fname);
query_releasename(client, &fname);
fname = mname;
} else
need_addname = true;
ISC_LIST_APPEND(fname->list, rdataset, link);
trdataset = rdataset;
rdataset = NULL;
added_something = true;
/*
* Note: we only add SIGs if we've added the type they cover,
* so we do not need to check if the SIG rdataset is already
* in the response.
*/
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list, sigrdataset, link);
sigrdataset = NULL;
}
}
if (qtype == dns_rdatatype_a) {
#ifdef ALLOW_FILTER_AAAA
bool have_a = false;
#endif
/*
* We now go looking for A and AAAA records, along with
* their signatures.
*
* XXXRTH This code could be more efficient.
*/
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
} else {
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto addname;
}
if (sigrdataset != NULL) {
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto addname;
}
if (query_isduplicate(client, fname, dns_rdatatype_a, NULL))
goto aaaa_lookup;
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_a, 0,
client->now,
rdataset, sigrdataset);
if (result == DNS_R_NCACHENXDOMAIN)
goto addname;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
if (result == ISC_R_SUCCESS) {
bool invalid = false;
mname = NULL;
#ifdef ALLOW_FILTER_AAAA
have_a = true;
#endif
if (additionaltype ==
dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)))
{
/* validate() may change rdataset->trust */
invalid = !validate(client, db, fname,
rdataset, sigrdataset);
}
if (invalid && DNS_TRUST_PENDING(rdataset->trust)) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (!query_isduplicate(client, fname,
dns_rdatatype_a, &mname))
{
if (mname != fname) {
if (mname != NULL) {
query_releasename(client,
&fname);
fname = mname;
} else
need_addname = true;
}
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = true;
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list,
sigrdataset, link);
sigrdataset =
query_newrdataset(client);
}
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto addname;
if (WANTDNSSEC(client) && sigrdataset == NULL)
goto addname;
} else {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
}
aaaa_lookup:
if (query_isduplicate(client, fname, dns_rdatatype_aaaa, NULL))
goto addname;
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_aaaa, 0,
client->now,
rdataset, sigrdataset);
if (result == DNS_R_NCACHENXDOMAIN)
goto addname;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
if (result == ISC_R_SUCCESS) {
bool invalid = false;
mname = NULL;
/*
* There's an A; check whether we're filtering AAAA
*/
#ifdef ALLOW_FILTER_AAAA
if (have_a &&
(client->filter_aaaa == dns_aaaa_break_dnssec ||
(client->filter_aaaa == dns_aaaa_filter &&
(!WANTDNSSEC(client) || sigrdataset == NULL ||
!dns_rdataset_isassociated(sigrdataset)))))
goto addname;
#endif
if (additionaltype ==
dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)))
{
/* validate() may change rdataset->trust */
invalid = !validate(client, db, fname,
rdataset, sigrdataset);
}
if (invalid && DNS_TRUST_PENDING(rdataset->trust)) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (!query_isduplicate(client, fname,
dns_rdatatype_aaaa, &mname))
{
if (mname != fname) {
if (mname != NULL) {
query_releasename(client,
&fname);
fname = mname;
} else
need_addname = true;
}
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = true;
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
ISC_LIST_APPEND(fname->list,
sigrdataset, link);
sigrdataset = NULL;
}
rdataset = NULL;
}
}
}
addname:
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional: addname");
/*
* If we haven't added anything, then we're done.
*/
if (!added_something)
goto cleanup;
/*
* We may have added our rdatasets to an existing name, if so, then
* need_addname will be false. Whether we used an existing name
* or a new one, we must set fname to NULL to prevent cleanup.
*/
if (need_addname)
dns_message_addname(client->message, fname,
DNS_SECTION_ADDITIONAL);
fname = NULL;
/*
* In a few cases, we want to add additional data for additional
* data. It's simpler to just deal with special cases here than
* to try to create a general purpose mechanism and allow the
* rdata implementations to do it themselves.
*
* This involves recursion, but the depth is limited. The
* most complex case is adding a SRV rdataset, which involves
* recursing to add address records, which in turn can cause
* recursion to add KEYs.
*/
if (type == dns_rdatatype_srv && trdataset != NULL) {
/*
* If we're adding SRV records to the additional data
* section, it's helpful if we add the SRV additional data
* as well.
*/
eresult = dns_rdataset_additionaldata(trdataset,
query_addadditional,
client);
}
cleanup:
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional: cleanup");
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional: done");
return (eresult);
}
static inline void
query_discardcache(ns_client_t *client, dns_rdataset_t *rdataset_base,
dns_rdatasetadditional_t additionaltype,
dns_rdatatype_t type, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbversion_t **versionp, dns_dbnode_t **nodep,
dns_name_t *fname)
{
dns_rdataset_t *rdataset;
while ((rdataset = ISC_LIST_HEAD(fname->list)) != NULL) {
ISC_LIST_UNLINK(fname->list, rdataset, link);
query_putrdataset(client, &rdataset);
}
if (*versionp != NULL)
dns_db_closeversion(*dbp, versionp, false);
if (*nodep != NULL)
dns_db_detachnode(*dbp, nodep);
if (*dbp != NULL)
dns_db_detach(dbp);
if (*zonep != NULL)
dns_zone_detach(zonep);
(void)dns_rdataset_putadditional(client->view->acache, rdataset_base,
additionaltype, type);
}
static inline isc_result_t
query_iscachevalid(dns_zone_t *zone, dns_db_t *db, dns_db_t *db0,
dns_dbversion_t *version)
{
isc_result_t result = ISC_R_SUCCESS;
dns_dbversion_t *version_current = NULL;
dns_db_t *db_current = db0;
if (db_current == NULL) {
result = dns_zone_getdb(zone, &db_current);
if (result != ISC_R_SUCCESS)
return (result);
}
dns_db_currentversion(db_current, &version_current);
if (db_current != db || version_current != version) {
result = ISC_R_FAILURE;
goto cleanup;
}
cleanup:
dns_db_closeversion(db_current, &version_current, false);
if (db0 == NULL && db_current != NULL)
dns_db_detach(&db_current);
return (result);
}
static isc_result_t
query_addadditional2(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
client_additionalctx_t *additionalctx = arg;
dns_rdataset_t *rdataset_base;
ns_client_t *client;
isc_result_t result, eresult;
dns_dbnode_t *node, *cnode;
dns_db_t *db, *cdb;
dns_name_t *fname, *mname0, cfname;
dns_rdataset_t *rdataset, *sigrdataset;
dns_rdataset_t *crdataset, *crdataset_next;
isc_buffer_t *dbuf;
isc_buffer_t b;
dns_dbversion_t *version, *cversion;
bool added_something, need_addname, needadditionalcache;
bool need_sigrrset;
dns_zone_t *zone;
dns_rdatatype_t type;
dns_rdatasetadditional_t additionaltype;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
bool invalid;
/*
* If we don't have an additional cache call query_addadditional.
*/
client = additionalctx->client;
REQUIRE(NS_CLIENT_VALID(client));
if (qtype != dns_rdatatype_a || client->view->acache == NULL) {
/*
* This function is optimized for "address" types. For other
* types, use a generic routine.
* XXX: ideally, this function should be generic enough.
*/
return (query_addadditional(additionalctx->client,
name, qtype));
}
/*
* Initialization.
*/
rdataset_base = additionalctx->rdataset;
eresult = ISC_R_SUCCESS;
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
db = NULL;
cdb = NULL;
version = NULL;
cversion = NULL;
node = NULL;
cnode = NULL;
added_something = false;
need_addname = false;
zone = NULL;
needadditionalcache = false;
POST(needadditionalcache);
additionaltype = dns_rdatasetadditional_fromauth;
dns_name_init(&cfname, NULL);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2");
/*
* We treat type A additional section processing as if it
* were "any address type" additional section processing.
* To avoid multiple lookups, we do an 'any' database
* lookup and iterate over the node.
* XXXJT: this approach can cause a suboptimal result when the cache
* DB only has partial address types and the glue DB has remaining
* ones.
*/
type = dns_rdatatype_any;
/*
* Get some resources.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
if (fname == NULL)
goto cleanup;
dns_name_setbuffer(&cfname, &b); /* share the buffer */
/* Check additional cache */
result = dns_rdataset_getadditional(rdataset_base, additionaltype,
type, client->view->acache, &zone,
&cdb, &cversion, &cnode, &cfname,
client->message, client->now);
if (result != ISC_R_SUCCESS)
goto findauthdb;
if (zone == NULL) {
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: auth zone not found");
goto try_cache;
}
/* Is the cached DB up-to-date? */
result = query_iscachevalid(zone, cdb, NULL, cversion);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: old auth additional cache");
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto findauthdb;
}
if (cnode == NULL) {
/*
* We have a negative cache. We don't have to check the zone
* ACL, since the result (not using this zone) would be same
* regardless of the result.
*/
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: negative auth additional cache");
dns_db_closeversion(cdb, &cversion, false);
dns_db_detach(&cdb);
dns_zone_detach(&zone);
goto try_cache;
}
result = query_validatezonedb(client, name, qtype, DNS_GETDB_NOLOG,
zone, cdb, NULL);
if (result != ISC_R_SUCCESS) {
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto try_cache;
}
/* We've got an active cache. */
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: auth additional cache");
dns_db_closeversion(cdb, &cversion, false);
db = cdb;
node = cnode;
dns_name_clone(&cfname, fname);
query_keepname(client, fname, dbuf);
goto foundcache;
/*
* Look for a zone database that might contain authoritative
* additional data.
*/
findauthdb:
result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
&zone, &db, &version);
if (result != ISC_R_SUCCESS) {
/* Cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
NULL, NULL, NULL, NULL,
NULL);
goto try_cache;
}
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2: db_find");
/*
* Since we are looking for authoritative data, we do not set
* the GLUEOK flag. Glue will be looked for later, but not
* necessarily in the same database.
*/
node = NULL;
result = dns_db_findext(db, name, version, type,
client->query.dboptions,
client->now, &node, fname, &cm, &ci,
NULL, NULL);
if (result == ISC_R_SUCCESS)
goto found;
/* Cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache, zone, db,
version, NULL, fname);
if (node != NULL)
dns_db_detachnode(db, &node);
version = NULL;
dns_db_detach(&db);
/*
* No authoritative data was found. The cache is our next best bet.
*/
try_cache:
additionaltype = dns_rdatasetadditional_fromcache;
result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
if (result != ISC_R_SUCCESS)
/*
* Most likely the client isn't allowed to query the cache.
*/
goto try_glue;
result = dns_db_findext(db, name, version, type,
client->query.dboptions |
DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
client->now, &node, fname, &cm, &ci,
NULL, NULL);
if (result == ISC_R_SUCCESS)
goto found;
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
try_glue:
/*
* No cached data was found. Glue is our last chance.
* RFC1035 sayeth:
*
* NS records cause both the usual additional section
* processing to locate a type A record, and, when used
* in a referral, a special search of the zone in which
* they reside for glue information.
*
* This is the "special search". Note that we must search
* the zone where the NS record resides, not the zone it
* points to, and that we only do the search in the delegation
* case (identified by client->query.gluedb being set).
*/
if (client->query.gluedb == NULL)
goto cleanup;
/*
* Don't poison caches using the bailiwick protection model.
*/
if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
goto cleanup;
/* Check additional cache */
additionaltype = dns_rdatasetadditional_fromglue;
result = dns_rdataset_getadditional(rdataset_base, additionaltype,
type, client->view->acache, NULL,
&cdb, &cversion, &cnode, &cfname,
client->message, client->now);
if (result != ISC_R_SUCCESS)
goto findglue;
result = query_iscachevalid(zone, cdb, client->query.gluedb, cversion);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: old glue additional cache");
query_discardcache(client, rdataset_base, additionaltype,
type, &zone, &cdb, &cversion, &cnode,
&cfname);
goto findglue;
}
if (cnode == NULL) {
/* We have a negative cache. */
CTRACE(ISC_LOG_DEBUG(3),
"query_addadditional2: negative glue additional cache");
dns_db_closeversion(cdb, &cversion, false);
dns_db_detach(&cdb);
goto cleanup;
}
/* Cache hit. */
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2: glue additional cache");
dns_db_closeversion(cdb, &cversion, false);
db = cdb;
node = cnode;
dns_name_clone(&cfname, fname);
query_keepname(client, fname, dbuf);
goto foundcache;
findglue:
dns_db_attach(client->query.gluedb, &db);
result = dns_db_findext(db, name, version, type,
client->query.dboptions | DNS_DBFIND_GLUEOK,
client->now, &node, fname, &cm, &ci,
NULL, NULL);
if (!(result == ISC_R_SUCCESS ||
result == DNS_R_ZONECUT ||
result == DNS_R_GLUE)) {
/* cache the negative result */
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
NULL, db, version, NULL,
fname);
goto cleanup;
}
found:
/*
* We have found a DB node to iterate over from a DB.
* We are going to look for address RRsets (i.e., A and AAAA) in the DB
* node we've just found. We'll then store the complete information
* in the additional data cache.
*/
dns_name_clone(fname, &cfname);
query_keepname(client, fname, dbuf);
needadditionalcache = true;
rdataset = query_newrdataset(client);
if (rdataset == NULL)
goto cleanup;
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
if (additionaltype == dns_rdatasetadditional_fromcache &&
query_isduplicate(client, fname, dns_rdatatype_a, NULL))
goto aaaa_lookup;
/*
* Find A RRset with sig RRset. Even if we don't find a sig RRset
* for a client using DNSSEC, we'll continue the process to make a
* complete list to be cached. However, we need to cancel the
* caching when something unexpected happens, in order to avoid
* caching incomplete information.
*/
result = dns_db_findrdataset(db, node, version, dns_rdatatype_a, 0,
client->now, rdataset, sigrdataset);
/*
* Try to promote pending/glue from the cache to secure.
* If unable to do so, drop it from the response unless
* it's glue, in which case it may still be needed.
*/
invalid = false;
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)))
{
invalid = !validate(client, db, fname,
rdataset, sigrdataset);
}
if (invalid && DNS_TRUST_PENDING(rdataset->trust)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
result = ISC_R_NOTFOUND;
}
if (result == DNS_R_NCACHENXDOMAIN)
goto setcache;
if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
if (result == ISC_R_SUCCESS) {
/* Remember the result as a cache */
ISC_LIST_APPEND(cfname.list, rdataset, link);
if (dns_rdataset_isassociated(sigrdataset)) {
ISC_LIST_APPEND(cfname.list, sigrdataset, link);
sigrdataset = query_newrdataset(client);
}
rdataset = query_newrdataset(client);
if (sigrdataset == NULL || rdataset == NULL) {
/* do not cache incomplete information */
goto foundcache;
}
}
aaaa_lookup:
if (additionaltype == dns_rdatasetadditional_fromcache &&
query_isduplicate(client, fname, dns_rdatatype_aaaa, NULL))
goto foundcache;
/* Find AAAA RRset with sig RRset */
result = dns_db_findrdataset(db, node, version, dns_rdatatype_aaaa,
0, client->now, rdataset, sigrdataset);
/*
* Try to promote pending/glue from the cache to secure.
* If unable to do so, drop it from the response unless
* it's glue, in which case it may still be needed.
*/
invalid = false;
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)))
{
invalid = !validate(client, db, fname,
rdataset, sigrdataset);
}
if (invalid && DNS_TRUST_PENDING(rdataset->trust)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
result = ISC_R_NOTFOUND;
}
if (result == ISC_R_SUCCESS) {
ISC_LIST_APPEND(cfname.list, rdataset, link);
rdataset = NULL;
if (dns_rdataset_isassociated(sigrdataset)) {
ISC_LIST_APPEND(cfname.list, sigrdataset, link);
sigrdataset = NULL;
}
}
setcache:
/*
* Set the new result in the cache if required. We do not support
* caching additional data from a cache DB.
*/
if (needadditionalcache == true &&
(additionaltype == dns_rdatasetadditional_fromauth ||
additionaltype == dns_rdatasetadditional_fromglue)) {
(void)dns_rdataset_setadditional(rdataset_base, additionaltype,
type, client->view->acache,
zone, db, version, node,
&cfname);
}
foundcache:
need_sigrrset = false;
mname0 = NULL;
for (crdataset = ISC_LIST_HEAD(cfname.list);
crdataset != NULL;
crdataset = crdataset_next) {
dns_name_t *mname;
crdataset_next = ISC_LIST_NEXT(crdataset, link);
mname = NULL;
if (crdataset->type == dns_rdatatype_a ||
crdataset->type == dns_rdatatype_aaaa) {
if (!query_isduplicate(client, fname, crdataset->type,
&mname)) {
if (mname != fname) {
if (mname != NULL) {
/*
* A different type of this name is
* already stored in the additional
* section. We'll reuse the name.
* Note that this should happen at most
* once. Otherwise, fname->link could
* leak below.
*/
INSIST(mname0 == NULL);
query_releasename(client, &fname);
fname = mname;
mname0 = mname;
} else
need_addname = true;
}
ISC_LIST_UNLINK(cfname.list, crdataset, link);
ISC_LIST_APPEND(fname->list, crdataset, link);
added_something = true;
need_sigrrset = true;
} else
need_sigrrset = false;
} else if (crdataset->type == dns_rdatatype_rrsig &&
need_sigrrset && WANTDNSSEC(client)) {
ISC_LIST_UNLINK(cfname.list, crdataset, link);
ISC_LIST_APPEND(fname->list, crdataset, link);
added_something = true; /* just in case */
need_sigrrset = false;
}
}
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2: addname");
/*
* If we haven't added anything, then we're done.
*/
if (!added_something)
goto cleanup;
/*
* We may have added our rdatasets to an existing name, if so, then
* need_addname will be false. Whether we used an existing name
* or a new one, we must set fname to NULL to prevent cleanup.
*/
if (need_addname)
dns_message_addname(client->message, fname,
DNS_SECTION_ADDITIONAL);
fname = NULL;
cleanup:
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2: cleanup");
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
while ((crdataset = ISC_LIST_HEAD(cfname.list)) != NULL) {
ISC_LIST_UNLINK(cfname.list, crdataset, link);
query_putrdataset(client, &crdataset);
}
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional2: done");
return (eresult);
}
static inline void
query_addrdataset(ns_client_t *client, dns_name_t *fname,
dns_rdataset_t *rdataset)
{
client_additionalctx_t additionalctx;
/*
* Add 'rdataset' and any pertinent additional data to
* 'fname', a name in the response message for 'client'.
*/
CTRACE(ISC_LOG_DEBUG(3), "query_addrdataset");
ISC_LIST_APPEND(fname->list, rdataset, link);
if (client->view->order != NULL)
rdataset->attributes |= dns_order_find(client->view->order,
fname, rdataset->type,
rdataset->rdclass);
rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
if (NOADDITIONAL(client))
return;
/*
* Add additional data.
*
* We don't care if dns_rdataset_additionaldata() fails.
*/
additionalctx.client = client;
additionalctx.rdataset = rdataset;
(void)dns_rdataset_additionaldata(rdataset, query_addadditional2,
&additionalctx);
CTRACE(ISC_LOG_DEBUG(3), "query_addrdataset: done");
}
static isc_result_t
query_dns64(ns_client_t *client, dns_name_t **namep, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset, isc_buffer_t *dbuf,
dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdata_t *dns64_rdata;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatalist_t *dns64_rdatalist;
dns_rdataset_t *dns64_rdataset;
dns_rdataset_t *mrdataset;
isc_buffer_t *buffer;
isc_region_t r;
isc_result_t result;
dns_view_t *view = client->view;
isc_netaddr_t netaddr;
dns_dns64_t *dns64;
unsigned int flags = 0;
/*%
* To the current response for 'client', add the answer RRset
* '*rdatasetp' and an optional signature set '*sigrdatasetp', with
* owner name '*namep', to section 'section', unless they are
* already there. Also add any pertinent additional data.
*
* If 'dbuf' is not NULL, then '*namep' is the name whose data is
* stored in 'dbuf'. In this case, query_addrrset() guarantees that
* when it returns the name will either have been kept or released.
*/
CTRACE(ISC_LOG_DEBUG(3), "query_dns64");
name = *namep;
mname = NULL;
mrdataset = NULL;
buffer = NULL;
dns64_rdata = NULL;
dns64_rdataset = NULL;
dns64_rdatalist = NULL;
result = dns_message_findname(client->message, section,
name, dns_rdatatype_aaaa,
rdataset->covers,
&mname, &mrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
* There's nothing else to do;
*/
CTRACE(ISC_LOG_DEBUG(3),
"query_dns64: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
return (ISC_R_SUCCESS);
} else if (result == DNS_R_NXDOMAIN) {
/*
* The name doesn't exist.
*/
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
*namep = NULL;
mname = name;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
result = isc_buffer_allocate(client->mctx, &buffer, view->dns64cnt *
16 * dns_rdataset_count(rdataset));
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(client->message, &dns64_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdatalist(client->message,
&dns64_rdatalist);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdatalist_init(dns64_rdatalist);
dns64_rdatalist->rdclass = dns_rdataclass_in;
dns64_rdatalist->type = dns_rdatatype_aaaa;
if (client->query.dns64_ttl != UINT32_MAX)
dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl,
client->query.dns64_ttl);
else
dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl, 600);
if (RECURSIONOK(client))
flags |= DNS_DNS64_RECURSIVE;
/*
* We use the signatures from the A lookup to set DNS_DNS64_DNSSEC
* as this provides a easy way to see if the answer was signed.
*/
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
flags |= DNS_DNS64_DNSSEC;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
for (dns64 = ISC_LIST_HEAD(client->view->dns64);
dns64 != NULL; dns64 = dns_dns64_next(dns64)) {
dns_rdataset_current(rdataset, &rdata);
isc_buffer_availableregion(buffer, &r);
INSIST(r.length >= 16);
result = dns_dns64_aaaafroma(dns64, &netaddr,
client->signer,
&ns_g_server->aclenv,
flags, rdata.data, r.base);
if (result != ISC_R_SUCCESS) {
dns_rdata_reset(&rdata);
continue;
}
isc_buffer_add(buffer, 16);
isc_buffer_remainingregion(buffer, &r);
isc_buffer_forward(buffer, 16);
result = dns_message_gettemprdata(client->message,
&dns64_rdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdata_init(dns64_rdata);
dns_rdata_fromregion(dns64_rdata, dns_rdataclass_in,
dns_rdatatype_aaaa, &r);
ISC_LIST_APPEND(dns64_rdatalist->rdata, dns64_rdata,
link);
dns64_rdata = NULL;
dns_rdata_reset(&rdata);
}
}
if (result != ISC_R_NOMORE)
goto cleanup;
if (ISC_LIST_EMPTY(dns64_rdatalist->rdata))
goto cleanup;
result = dns_rdatalist_tordataset(dns64_rdatalist, dns64_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_setownercase(dns64_rdataset, mname);
client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
dns64_rdataset->trust = rdataset->trust;
query_addrdataset(client, mname, dns64_rdataset);
dns64_rdataset = NULL;
dns64_rdatalist = NULL;
dns_message_takebuffer(client->message, &buffer);
inc_stats(client, dns_nsstatscounter_dns64);
result = ISC_R_SUCCESS;
cleanup:
if (buffer != NULL)
isc_buffer_free(&buffer);
if (dns64_rdata != NULL)
dns_message_puttemprdata(client->message, &dns64_rdata);
if (dns64_rdataset != NULL)
dns_message_puttemprdataset(client->message, &dns64_rdataset);
if (dns64_rdatalist != NULL) {
for (dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata);
dns64_rdata != NULL;
dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata))
{
ISC_LIST_UNLINK(dns64_rdatalist->rdata,
dns64_rdata, link);
dns_message_puttemprdata(client->message, &dns64_rdata);
}
dns_message_puttemprdatalist(client->message, &dns64_rdatalist);
}
CTRACE(ISC_LOG_DEBUG(3), "query_dns64: done");
return (result);
}
static void
query_filter64(ns_client_t *client, dns_name_t **namep,
dns_rdataset_t *rdataset, isc_buffer_t *dbuf,
dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdata_t *myrdata;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatalist_t *myrdatalist;
dns_rdataset_t *myrdataset;
isc_buffer_t *buffer;
isc_region_t r;
isc_result_t result;
unsigned int i;
CTRACE(ISC_LOG_DEBUG(3), "query_filter64");
INSIST(client->query.dns64_aaaaok != NULL);
INSIST(client->query.dns64_aaaaoklen == dns_rdataset_count(rdataset));
name = *namep;
mname = NULL;
buffer = NULL;
myrdata = NULL;
myrdataset = NULL;
myrdatalist = NULL;
result = dns_message_findname(client->message, section,
name, dns_rdatatype_aaaa,
rdataset->covers,
&mname, &myrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
* There's nothing else to do;
*/
CTRACE(ISC_LOG_DEBUG(3),
"query_filter64: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
return;
} else if (result == DNS_R_NXDOMAIN) {
mname = name;
*namep = NULL;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
dbuf = NULL;
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
result = isc_buffer_allocate(client->mctx, &buffer,
16 * dns_rdataset_count(rdataset));
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(client->message, &myrdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdatalist(client->message, &myrdatalist);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdatalist_init(myrdatalist);
myrdatalist->rdclass = dns_rdataclass_in;
myrdatalist->type = dns_rdatatype_aaaa;
myrdatalist->ttl = rdataset->ttl;
i = 0;
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
if (!client->query.dns64_aaaaok[i++])
continue;
dns_rdataset_current(rdataset, &rdata);
INSIST(rdata.length == 16);
isc_buffer_putmem(buffer, rdata.data, rdata.length);
isc_buffer_remainingregion(buffer, &r);
isc_buffer_forward(buffer, rdata.length);
result = dns_message_gettemprdata(client->message, &myrdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdata_init(myrdata);
dns_rdata_fromregion(myrdata, dns_rdataclass_in,
dns_rdatatype_aaaa, &r);
ISC_LIST_APPEND(myrdatalist->rdata, myrdata, link);
myrdata = NULL;
dns_rdata_reset(&rdata);
}
if (result != ISC_R_NOMORE)
goto cleanup;
result = dns_rdatalist_tordataset(myrdatalist, myrdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_setownercase(myrdataset, name);
client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
if (mname == name) {
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
dbuf = NULL;
}
myrdataset->trust = rdataset->trust;
query_addrdataset(client, mname, myrdataset);
myrdataset = NULL;
myrdatalist = NULL;
dns_message_takebuffer(client->message, &buffer);
cleanup:
if (buffer != NULL)
isc_buffer_free(&buffer);
if (myrdata != NULL)
dns_message_puttemprdata(client->message, &myrdata);
if (myrdataset != NULL)
dns_message_puttemprdataset(client->message, &myrdataset);
if (myrdatalist != NULL) {
for (myrdata = ISC_LIST_HEAD(myrdatalist->rdata);
myrdata != NULL;
myrdata = ISC_LIST_HEAD(myrdatalist->rdata))
{
ISC_LIST_UNLINK(myrdatalist->rdata, myrdata, link);
dns_message_puttemprdata(client->message, &myrdata);
}
dns_message_puttemprdatalist(client->message, &myrdatalist);
}
if (dbuf != NULL)
query_releasename(client, &name);
CTRACE(ISC_LOG_DEBUG(3), "query_filter64: done");
}
static void
query_addrrset(ns_client_t *client, dns_name_t **namep,
dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp,
isc_buffer_t *dbuf, dns_section_t section)
{
dns_name_t *name, *mname;
dns_rdataset_t *rdataset, *mrdataset, *sigrdataset;
isc_result_t result;
/*%
* To the current response for 'client', add the answer RRset
* '*rdatasetp' and an optional signature set '*sigrdatasetp', with
* owner name '*namep', to section 'section', unless they are
* already there. Also add any pertinent additional data.
*
* If 'dbuf' is not NULL, then '*namep' is the name whose data is
* stored in 'dbuf'. In this case, query_addrrset() guarantees that
* when it returns the name will either have been kept or released.
*/
CTRACE(ISC_LOG_DEBUG(3), "query_addrrset");
name = *namep;
rdataset = *rdatasetp;
if (sigrdatasetp != NULL)
sigrdataset = *sigrdatasetp;
else
sigrdataset = NULL;
mname = NULL;
mrdataset = NULL;
result = dns_message_findname(client->message, section,
name, rdataset->type, rdataset->covers,
&mname, &mrdataset);
if (result == ISC_R_SUCCESS) {
/*
* We've already got an RRset of the given name and type.
*/
CTRACE(ISC_LOG_DEBUG(3),
"query_addrrset: dns_message_findname succeeded: done");
if (dbuf != NULL)
query_releasename(client, namep);
if ((rdataset->attributes & DNS_RDATASETATTR_REQUIRED) != 0)
mrdataset->attributes |= DNS_RDATASETATTR_REQUIRED;
return;
} else if (result == DNS_R_NXDOMAIN) {
/*
* The name doesn't exist.
*/
if (dbuf != NULL)
query_keepname(client, name, dbuf);
dns_message_addname(client->message, name, section);
*namep = NULL;
mname = name;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (dbuf != NULL)
query_releasename(client, namep);
}
if (rdataset->trust != dns_trust_secure &&
(section == DNS_SECTION_ANSWER ||
section == DNS_SECTION_AUTHORITY))
client->query.attributes &= ~NS_QUERYATTR_SECURE;
/*
* Note: we only add SIGs if we've added the type they cover, so
* we do not need to check if the SIG rdataset is already in the
* response.
*/
query_addrdataset(client, mname, rdataset);
*rdatasetp = NULL;
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset)) {
/*
* We have a signature. Add it to the response.
*/
ISC_LIST_APPEND(mname->list, sigrdataset, link);
*sigrdatasetp = NULL;
}
CTRACE(ISC_LOG_DEBUG(3), "query_addrrset: done");
}
static inline isc_result_t
query_addsoa(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version,
unsigned int override_ttl, bool isassociated,
dns_section_t section)
{
dns_name_t *name;
dns_dbnode_t *node;
isc_result_t result, eresult;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_rdataset_t **sigrdatasetp = NULL;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "query_addsoa");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
name = NULL;
rdataset = NULL;
node = NULL;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Don't add the SOA record for test which set "-T nosoa".
*/
if (ns_g_nosoa && (!WANTDNSSEC(client) || !isassociated))
return (ISC_R_SUCCESS);
/*
* Get resources and make 'name' be the database origin.
*/
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS)
return (result);
dns_name_init(name, NULL);
dns_name_clone(dns_db_origin(db), name);
rdataset = query_newrdataset(client);
if (rdataset == NULL) {
CTRACE(ISC_LOG_ERROR, "unable to allocate rdataset");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
if (WANTDNSSEC(client) && dns_db_issecure(db)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
CTRACE(ISC_LOG_ERROR, "unable to allocate sigrdataset");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
}
/*
* Find the SOA.
*/
result = dns_db_getoriginnode(db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_soa, 0, client->now,
rdataset, sigrdataset);
} else {
dns_fixedname_t foundname;
dns_name_t *fname;
fname = dns_fixedname_initname(&foundname);
result = dns_db_findext(db, name, version, dns_rdatatype_soa,
client->query.dboptions, 0, &node,
fname, &cm, &ci, rdataset, sigrdataset);
}
if (result != ISC_R_SUCCESS) {
/*
* This is bad. We tried to get the SOA RR at the zone top
* and it didn't work!
*/
CTRACE(ISC_LOG_ERROR, "unable to find SOA RR at zone apex");
eresult = DNS_R_SERVFAIL;
} else {
/*
* Extract the SOA MINIMUM.
*/
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
result = dns_rdataset_first(rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (override_ttl != UINT32_MAX &&
override_ttl < rdataset->ttl) {
rdataset->ttl = override_ttl;
if (sigrdataset != NULL)
sigrdataset->ttl = override_ttl;
}
/*
* Add the SOA and its SIG to the response, with the
* TTLs adjusted per RFC2308 section 3.
*/
if (rdataset->ttl > soa.minimum)
rdataset->ttl = soa.minimum;
if (sigrdataset != NULL && sigrdataset->ttl > soa.minimum)
sigrdataset->ttl = soa.minimum;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (section == DNS_SECTION_ADDITIONAL)
rdataset->attributes |= DNS_RDATASETATTR_REQUIRED;
query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
section);
}
cleanup:
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (name != NULL)
query_releasename(client, &name);
if (node != NULL)
dns_db_detachnode(db, &node);
return (eresult);
}
static inline isc_result_t
query_addns(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version) {
dns_name_t *name, *fname;
dns_dbnode_t *node;
isc_result_t result, eresult;
dns_fixedname_t foundname;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_rdataset_t **sigrdatasetp = NULL;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "query_addns");
/*
* Initialization.
*/
eresult = ISC_R_SUCCESS;
name = NULL;
rdataset = NULL;
node = NULL;
fname = dns_fixedname_initname(&foundname);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Get resources and make 'name' be the database origin.
*/
result = dns_message_gettempname(client->message, &name);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_DEBUG(3),
"query_addns: dns_message_gettempname failed: done");
return (result);
}
dns_name_init(name, NULL);
dns_name_clone(dns_db_origin(db), name);
rdataset = query_newrdataset(client);
if (rdataset == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_addns: query_newrdataset failed");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
if (WANTDNSSEC(client) && dns_db_issecure(db)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_addns: query_newrdataset failed");
eresult = DNS_R_SERVFAIL;
goto cleanup;
}
}
/*
* Find the NS rdataset.
*/
result = dns_db_getoriginnode(db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_ns, 0, client->now,
rdataset, sigrdataset);
} else {
CTRACE(ISC_LOG_DEBUG(3), "query_addns: calling dns_db_find");
result = dns_db_findext(db, name, NULL, dns_rdatatype_ns,
client->query.dboptions, 0, &node,
fname, &cm, &ci, rdataset, sigrdataset);
CTRACE(ISC_LOG_DEBUG(3), "query_addns: dns_db_find complete");
}
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_ERROR,
"query_addns: "
"dns_db_findrdataset or dns_db_find failed");
/*
* This is bad. We tried to get the NS rdataset at the zone
* top and it didn't work!
*/
eresult = DNS_R_SERVFAIL;
} else {
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
DNS_SECTION_AUTHORITY);
}
cleanup:
CTRACE(ISC_LOG_DEBUG(3), "query_addns: cleanup");
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (name != NULL)
query_releasename(client, &name);
if (node != NULL)
dns_db_detachnode(db, &node);
CTRACE(ISC_LOG_DEBUG(3), "query_addns: done");
return (eresult);
}
static isc_result_t
query_add_cname(ns_client_t *client, dns_name_t *qname, dns_name_t *tname,
dns_trust_t trust, dns_ttl_t ttl)
{
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
isc_region_t r;
dns_name_t *aname;
isc_result_t result;
/*
* We assume the name data referred to by tname won't go away.
*/
aname = NULL;
result = dns_message_gettempname(client->message, &aname);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_name_dup(qname, client->mctx, aname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
rdatalist = NULL;
result = dns_message_gettemprdatalist(client->message, &rdatalist);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
rdata = NULL;
result = dns_message_gettemprdata(client->message, &rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
dns_message_puttemprdatalist(client->message, &rdatalist);
return (result);
}
rdataset = NULL;
result = dns_message_gettemprdataset(client->message, &rdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
dns_message_puttemprdatalist(client->message, &rdatalist);
dns_message_puttemprdata(client->message, &rdata);
return (result);
}
rdatalist->type = dns_rdatatype_cname;
rdatalist->rdclass = client->message->rdclass;
rdatalist->ttl = ttl;
dns_name_toregion(tname, &r);
rdata->data = r.base;
rdata->length = r.length;
rdata->rdclass = client->message->rdclass;
rdata->type = dns_rdatatype_cname;
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset)
== ISC_R_SUCCESS);
rdataset->trust = trust;
dns_rdataset_setownercase(rdataset, aname);
query_addrrset(client, &aname, &rdataset, NULL, NULL,
DNS_SECTION_ANSWER);
if (rdataset != NULL) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, &rdataset);
}
if (aname != NULL)
dns_message_puttempname(client->message, &aname);
return (ISC_R_SUCCESS);
}
static bool
get_root_key_sentinel_id(ns_client_t *client, const char *ndata) {
unsigned int v = 0;
int i;
for (i = 0; i < 5; i++) {
if (ndata[i] < '0' || ndata[i] > '9') {
return (false);
}
v *= 10;
v += ndata[i] - '0';
}
if (v > 65535U) {
return (false);
}
client->query.root_key_sentinel_keyid = v;
return (true);
}
/*%
* Find out if the query is for a root key sentinel and if so, record the type
* of root key sentinel query and the key id that is being checked for.
*
* The code is assuming a zero padded decimal field of width 5.
*/
static void
root_key_sentinel_detect(ns_client_t *client) {
const char *ndata = (const char *)client->query.qname->ndata;
if (client->query.qname->length > 30 && ndata[0] == 29 &&
strncasecmp(ndata + 1, "root-key-sentinel-is-ta-", 24) == 0)
{
if (!get_root_key_sentinel_id(client, ndata + 25)) {
return;
}
client->query.root_key_sentinel_is_ta = true;
ns_client_log(client, NS_LOGCATEGORY_TAT,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"root-key-sentinel-is-ta query label found");
} else if (client->query.qname->length > 31 && ndata[0] == 30 &&
strncasecmp(ndata + 1, "root-key-sentinel-not-ta-", 25) == 0)
{
if (!get_root_key_sentinel_id(client, ndata + 26)) {
return;
}
client->query.root_key_sentinel_not_ta = true;
ns_client_log(client, NS_LOGCATEGORY_TAT,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"root-key-sentinel-not-ta query label found");
}
}
/*
* Mark the RRsets as secure. Update the cache (db) to reflect the
* change in trust level.
*/
static void
mark_secure(ns_client_t *client, dns_db_t *db, dns_name_t *name,
dns_rdata_rrsig_t *rrsig, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
isc_stdtime_t now;
rdataset->trust = dns_trust_secure;
sigrdataset->trust = dns_trust_secure;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Save the updated secure state. Ignore failures.
*/
result = dns_db_findnodeext(db, name, true, &cm, &ci, &node);
if (result != ISC_R_SUCCESS)
return;
isc_stdtime_get(&now);
dns_rdataset_trimttl(rdataset, sigrdataset, rrsig, now,
client->view->acceptexpired);
(void)dns_db_addrdataset(db, node, NULL, client->now, rdataset,
0, NULL);
(void)dns_db_addrdataset(db, node, NULL, client->now, sigrdataset,
0, NULL);
dns_db_detachnode(db, &node);
}
/*
* Find the secure key that corresponds to rrsig.
* Note: 'keyrdataset' maintains state between successive calls,
* there may be multiple keys with the same keyid.
* Return false if we have exhausted all the possible keys.
*/
static bool
get_key(ns_client_t *client, dns_db_t *db, dns_rdata_rrsig_t *rrsig,
dns_rdataset_t *keyrdataset, dst_key_t **keyp)
{
isc_result_t result;
dns_dbnode_t *node = NULL;
bool secure = false;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
if (!dns_rdataset_isassociated(keyrdataset)) {
result = dns_db_findnodeext(db, &rrsig->signer, false,
&cm, &ci, &node);
if (result != ISC_R_SUCCESS)
return (false);
result = dns_db_findrdataset(db, node, NULL,
dns_rdatatype_dnskey, 0,
client->now, keyrdataset, NULL);
dns_db_detachnode(db, &node);
if (result != ISC_R_SUCCESS)
return (false);
if (keyrdataset->trust != dns_trust_secure)
return (false);
result = dns_rdataset_first(keyrdataset);
} else
result = dns_rdataset_next(keyrdataset);
for ( ; result == ISC_R_SUCCESS;
result = dns_rdataset_next(keyrdataset)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_buffer_t b;
dns_rdataset_current(keyrdataset, &rdata);
isc_buffer_init(&b, rdata.data, rdata.length);
isc_buffer_add(&b, rdata.length);
result = dst_key_fromdns(&rrsig->signer, rdata.rdclass, &b,
client->mctx, keyp);
if (result != ISC_R_SUCCESS)
continue;
if (rrsig->algorithm == (dns_secalg_t)dst_key_alg(*keyp) &&
rrsig->keyid == (dns_keytag_t)dst_key_id(*keyp) &&
dst_key_iszonekey(*keyp)) {
secure = true;
break;
}
dst_key_free(keyp);
}
return (secure);
}
static bool
verify(dst_key_t *key, dns_name_t *name, dns_rdataset_t *rdataset,
dns_rdata_t *rdata, ns_client_t *client)
{
isc_result_t result;
dns_fixedname_t fixed;
bool ignore = false;
dns_fixedname_init(&fixed);
again:
result = dns_dnssec_verify3(name, rdataset, key, ignore,
client->view->maxbits, client->mctx,
rdata, NULL);
if (result == DNS_R_SIGEXPIRED && client->view->acceptexpired) {
ignore = true;
goto again;
}
if (result == ISC_R_SUCCESS || result == DNS_R_FROMWILDCARD)
return (true);
return (false);
}
/*
* Validate the rdataset if possible with available records.
*/
static bool
validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_rrsig_t rrsig;
dst_key_t *key = NULL;
dns_rdataset_t keyrdataset;
if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
return (false);
for (result = dns_rdataset_first(sigrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(sigrdataset)) {
dns_rdata_reset(&rdata);
dns_rdataset_current(sigrdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (!dns_resolver_algorithm_supported(client->view->resolver,
name, rrsig.algorithm))
continue;
if (!dns_name_issubdomain(name, &rrsig.signer))
continue;
dns_rdataset_init(&keyrdataset);
do {
if (!get_key(client, db, &rrsig, &keyrdataset, &key))
break;
if (verify(key, name, rdataset, &rdata, client)) {
dst_key_free(&key);
dns_rdataset_disassociate(&keyrdataset);
mark_secure(client, db, name, &rrsig,
rdataset, sigrdataset);
return (true);
}
dst_key_free(&key);
} while (1);
if (dns_rdataset_isassociated(&keyrdataset))
dns_rdataset_disassociate(&keyrdataset);
}
return (false);
}
static void
query_addbestns(ns_client_t *client) {
dns_db_t *db, *zdb;
dns_dbnode_t *node;
dns_name_t *fname, *zfname;
dns_rdataset_t *rdataset, *sigrdataset, *zrdataset, *zsigrdataset;
bool is_zone, use_zone;
isc_buffer_t *dbuf;
isc_result_t result;
dns_dbversion_t *version;
dns_zone_t *zone;
isc_buffer_t b;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "query_addbestns");
fname = NULL;
zfname = NULL;
rdataset = NULL;
zrdataset = NULL;
sigrdataset = NULL;
zsigrdataset = NULL;
node = NULL;
db = NULL;
zdb = NULL;
version = NULL;
zone = NULL;
is_zone = false;
use_zone = false;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Find the right database.
*/
result = query_getdb(client, client->query.qname, dns_rdatatype_ns, 0,
&zone, &db, &version, &is_zone);
if (result != ISC_R_SUCCESS)
goto cleanup;
db_find:
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL)
goto cleanup;
/*
* Get the RRSIGs if the client requested them or if we may
* need to validate answers from the cache.
*/
if (WANTDNSSEC(client) || !is_zone) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL)
goto cleanup;
}
/*
* Now look for the zonecut.
*/
if (is_zone) {
result = dns_db_findext(db, client->query.qname, version,
dns_rdatatype_ns,
client->query.dboptions,
client->now, &node, fname,
&cm, &ci, rdataset, sigrdataset);
if (result != DNS_R_DELEGATION)
goto cleanup;
if (USECACHE(client)) {
query_keepname(client, fname, dbuf);
dns_db_detachnode(db, &node);
SAVE(zdb, db);
SAVE(zfname, fname);
SAVE(zrdataset, rdataset);
SAVE(zsigrdataset, sigrdataset);
version = NULL;
dns_db_attach(client->view->cachedb, &db);
is_zone = false;
goto db_find;
}
} else {
result = dns_db_findzonecut(db, client->query.qname,
client->query.dboptions,
client->now, &node, fname,
rdataset, sigrdataset);
if (result == ISC_R_SUCCESS) {
if (zfname != NULL &&
!dns_name_issubdomain(fname, zfname)) {
/*
* We found a zonecut in the cache, but our
* zone delegation is better.
*/
use_zone = true;
}
} else if (result == ISC_R_NOTFOUND && zfname != NULL) {
/*
* We didn't find anything in the cache, but we
* have a zone delegation, so use it.
*/
use_zone = true;
} else
goto cleanup;
}
if (use_zone) {
query_releasename(client, &fname);
/*
* We've already done query_keepname() on
* zfname, so we must set dbuf to NULL to
* prevent query_addrrset() from trying to
* call query_keepname() again.
*/
dbuf = NULL;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
RESTORE(db, zdb);
RESTORE(fname, zfname);
RESTORE(rdataset, zrdataset);
RESTORE(sigrdataset, zsigrdataset);
}
/*
* Attempt to validate RRsets that are pending or that are glue.
*/
if ((DNS_TRUST_PENDING(rdataset->trust) ||
(sigrdataset != NULL && DNS_TRUST_PENDING(sigrdataset->trust)))
&& !validate(client, db, fname, rdataset, sigrdataset) &&
!PENDINGOK(client->query.dboptions))
goto cleanup;
if ((DNS_TRUST_GLUE(rdataset->trust) ||
(sigrdataset != NULL && DNS_TRUST_GLUE(sigrdataset->trust))) &&
!validate(client, db, fname, rdataset, sigrdataset) &&
SECURE(client) && WANTDNSSEC(client))
goto cleanup;
/*
* If the answer is secure only add NS records if they are secure
* when the client may be looking for AD in the response.
*/
if (SECURE(client) && (WANTDNSSEC(client) || WANTAD(client)) &&
((rdataset->trust != dns_trust_secure) ||
(sigrdataset != NULL && sigrdataset->trust != dns_trust_secure)))
goto cleanup;
/*
* If the client doesn't want DNSSEC we can discard the sigrdataset
* now.
*/
if (!WANTDNSSEC(client))
query_putrdataset(client, &sigrdataset);
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
if (zdb != NULL) {
query_putrdataset(client, &zrdataset);
if (zsigrdataset != NULL)
query_putrdataset(client, &zsigrdataset);
if (zfname != NULL)
query_releasename(client, &zfname);
dns_db_detach(&zdb);
}
}
static void
fixrdataset(ns_client_t *client, dns_rdataset_t **rdataset) {
if (*rdataset == NULL)
*rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(*rdataset))
dns_rdataset_disassociate(*rdataset);
}
static void
fixfname(ns_client_t *client, dns_name_t **fname, isc_buffer_t **dbuf,
isc_buffer_t *nbuf)
{
if (*fname == NULL) {
*dbuf = query_getnamebuf(client);
if (*dbuf == NULL)
return;
*fname = query_newname(client, *dbuf, nbuf);
}
}
static void
query_addds(ns_client_t *client, dns_db_t *db, dns_dbnode_t *node,
dns_dbversion_t *version, dns_name_t *name)
{
dns_fixedname_t fixed;
dns_name_t *fname = NULL;
dns_name_t *rname;
dns_rdataset_t *rdataset, *sigrdataset;
isc_buffer_t *dbuf, b;
isc_result_t result;
unsigned int count;
CTRACE(ISC_LOG_DEBUG(3), "query_addds");
rname = NULL;
rdataset = NULL;
sigrdataset = NULL;
/*
* We'll need some resources...
*/
rdataset = query_newrdataset(client);
sigrdataset = query_newrdataset(client);
if (rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Look for the DS record, which may or may not be present.
*/
result = dns_db_findrdataset(db, node, version, dns_rdatatype_ds, 0,
client->now, rdataset, sigrdataset);
/*
* If we didn't find it, look for an NSEC.
*/
if (result == ISC_R_NOTFOUND)
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_nsec, 0, client->now,
rdataset, sigrdataset);
if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
goto addnsec3;
if (!dns_rdataset_isassociated(rdataset) ||
!dns_rdataset_isassociated(sigrdataset))
goto addnsec3;
/*
* We've already added the NS record, so if the name's not there,
* we have other problems. Use this name rather than calling
* query_addrrset().
*/
result = dns_message_firstname(client->message, DNS_SECTION_AUTHORITY);
if (result != ISC_R_SUCCESS)
goto cleanup;
rname = NULL;
dns_message_currentname(client->message, DNS_SECTION_AUTHORITY,
&rname);
result = dns_message_findtype(rname, dns_rdatatype_ns, 0, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
ISC_LIST_APPEND(rname->list, rdataset, link);
ISC_LIST_APPEND(rname->list, sigrdataset, link);
rdataset = NULL;
sigrdataset = NULL;
return;
addnsec3:
if (!dns_db_iszone(db))
goto cleanup;
/*
* Add the NSEC3 which proves the DS does not exist.
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
dns_fixedname_init(&fixed);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
query_findclosestnsec3(name, db, version, client, rdataset,
sigrdataset, fname, true,
dns_fixedname_name(&fixed));
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
/*
* Did we find the closest provable encloser instead?
* If so add the nearest to the closest provable encloser.
*/
if (!dns_name_equal(name, dns_fixedname_name(&fixed))) {
count = dns_name_countlabels(dns_fixedname_name(&fixed)) + 1;
dns_name_getlabelsequence(name,
dns_name_countlabels(name) - count,
count, dns_fixedname_name(&fixed));
fixfname(client, &fname, &dbuf, &b);
fixrdataset(client, &rdataset);
fixrdataset(client, &sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
query_findclosestnsec3(dns_fixedname_name(&fixed), db, version,
client, rdataset, sigrdataset, fname,
false, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
DNS_SECTION_AUTHORITY);
}
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
}
static void
query_addwildcardproof(ns_client_t *client, dns_db_t *db,
dns_dbversion_t *version, dns_name_t *name,
bool ispositive, bool nodata)
{
isc_buffer_t *dbuf, b;
dns_name_t *fname;
dns_rdataset_t *rdataset, *sigrdataset;
dns_fixedname_t wfixed;
dns_name_t *wname;
dns_dbnode_t *node;
unsigned int options;
unsigned int olabels, nlabels, labels;
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_nsec_t nsec;
bool have_wname;
int order;
dns_fixedname_t cfixed;
dns_name_t *cname;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "query_addwildcardproof");
fname = NULL;
rdataset = NULL;
sigrdataset = NULL;
node = NULL;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Get the NOQNAME proof then if !ispositive
* get the NOWILDCARD proof.
*
* DNS_DBFIND_NOWILD finds the NSEC records that covers the
* name ignoring any wildcard. From the owner and next names
* of this record you can compute which wildcard (if it exists)
* will match by finding the longest common suffix of the
* owner name and next names with the qname and prefixing that
* with the wildcard label.
*
* e.g.
* Given:
* example SOA
* example NSEC b.example
* b.example A
* b.example NSEC a.d.example
* a.d.example A
* a.d.example NSEC g.f.example
* g.f.example A
* g.f.example NSEC z.i.example
* z.i.example A
* z.i.example NSEC example
*
* QNAME:
* a.example -> example NSEC b.example
* owner common example
* next common example
* wild *.example
* d.b.example -> b.example NSEC a.d.example
* owner common b.example
* next common example
* wild *.b.example
* a.f.example -> a.d.example NSEC g.f.example
* owner common example
* next common f.example
* wild *.f.example
* j.example -> z.i.example NSEC example
* owner common example
* next common example
* wild *.example
*/
options = client->query.dboptions | DNS_DBFIND_NOWILD;
wname = dns_fixedname_initname(&wfixed);
again:
have_wname = false;
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
sigrdataset = query_newrdataset(client);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
result = dns_db_findext(db, name, version, dns_rdatatype_nsec,
options, 0, &node, fname, &cm, &ci,
rdataset, sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
if (!dns_rdataset_isassociated(rdataset)) {
/*
* No NSEC proof available, return NSEC3 proofs instead.
*/
cname = dns_fixedname_initname(&cfixed);
/*
* Find the closest encloser.
*/
dns_name_copy(name, cname, NULL);
while (result == DNS_R_NXDOMAIN) {
labels = dns_name_countlabels(cname) - 1;
/*
* Sanity check.
*/
if (labels == 0U)
goto cleanup;
dns_name_split(cname, labels, NULL, cname);
result = dns_db_findext(db, cname, version,
dns_rdatatype_nsec,
options, 0, NULL, fname,
&cm, &ci, NULL, NULL);
}
/*
* Add closest (provable) encloser NSEC3.
*/
query_findclosestnsec3(cname, db, version, client, rdataset,
sigrdataset, fname, true, cname);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
if (!ispositive)
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
/*
* Replace resources which were consumed by query_addrrset.
*/
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (rdataset == NULL)
rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset == NULL)
sigrdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Add no qname proof.
*/
labels = dns_name_countlabels(cname) + 1;
if (dns_name_countlabels(name) == labels)
dns_name_copy(name, wname, NULL);
else
dns_name_split(name, labels, NULL, wname);
query_findclosestnsec3(wname, db, version, client, rdataset,
sigrdataset, fname, false, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
if (ispositive)
goto cleanup;
/*
* Replace resources which were consumed by query_addrrset.
*/
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (rdataset == NULL)
rdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset == NULL)
sigrdataset = query_newrdataset(client);
else if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
goto cleanup;
/*
* Add the no wildcard proof.
*/
result = dns_name_concatenate(dns_wildcardname,
cname, wname, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
query_findclosestnsec3(wname, db, version, client, rdataset,
sigrdataset, fname, nodata, NULL);
if (!dns_rdataset_isassociated(rdataset))
goto cleanup;
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
goto cleanup;
} else if (result == DNS_R_NXDOMAIN) {
if (!ispositive)
result = dns_rdataset_first(rdataset);
if (result == ISC_R_SUCCESS) {
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &nsec, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
(void)dns_name_fullcompare(name, fname, &order,
&olabels);
(void)dns_name_fullcompare(name, &nsec.next, &order,
&nlabels);
/*
* Check for a pathological condition created when
* serving some malformed signed zones and bail out.
*/
if (dns_name_countlabels(name) == nlabels)
goto cleanup;
if (olabels > nlabels)
dns_name_split(name, olabels, NULL, wname);
else
dns_name_split(name, nlabels, NULL, wname);
result = dns_name_concatenate(dns_wildcardname,
wname, wname, NULL);
if (result == ISC_R_SUCCESS)
have_wname = true;
dns_rdata_freestruct(&nsec);
}
query_addrrset(client, &fname, &rdataset, &sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
}
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (have_wname) {
ispositive = true; /* prevent loop */
if (!dns_name_equal(name, wname)) {
name = wname;
goto again;
}
}
cleanup:
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
}
static void
query_addnxrrsetnsec(ns_client_t *client, dns_db_t *db,
dns_dbversion_t *version, dns_name_t **namep,
dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp)
{
dns_name_t *name;
dns_rdataset_t *sigrdataset;
dns_rdata_t sigrdata;
dns_rdata_rrsig_t sig;
unsigned int labels;
isc_buffer_t *dbuf, b;
dns_name_t *fname;
isc_result_t result;
name = *namep;
if ((name->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
query_addrrset(client, namep, rdatasetp, sigrdatasetp,
NULL, DNS_SECTION_AUTHORITY);
return;
}
if (sigrdatasetp == NULL)
return;
sigrdataset = *sigrdatasetp;
if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
return;
result = dns_rdataset_first(sigrdataset);
if (result != ISC_R_SUCCESS)
return;
dns_rdata_init(&sigrdata);
dns_rdataset_current(sigrdataset, &sigrdata);
result = dns_rdata_tostruct(&sigrdata, &sig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
labels = dns_name_countlabels(name);
if ((unsigned int)sig.labels + 1 >= labels)
return;
/* XXX */
query_addwildcardproof(client, db, version, client->query.qname,
true, false);
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
return;
fname = query_newname(client, dbuf, &b);
if (fname == NULL)
return;
dns_name_split(name, sig.labels + 1, NULL, fname);
/* This will succeed, since we've stripped labels. */
RUNTIME_CHECK(dns_name_concatenate(dns_wildcardname, fname, fname,
NULL) == ISC_R_SUCCESS);
query_addrrset(client, &fname, rdatasetp, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
}
static void
free_devent(ns_client_t *client, isc_event_t **eventp,
dns_fetchevent_t **deventp)
{
dns_fetchevent_t *devent = *deventp;
REQUIRE((void*)(*eventp) == (void *)(*deventp));
if (devent->fetch != NULL)
dns_resolver_destroyfetch(&devent->fetch);
if (devent->node != NULL)
dns_db_detachnode(devent->db, &devent->node);
if (devent->db != NULL)
dns_db_detach(&devent->db);
if (devent->rdataset != NULL)
query_putrdataset(client, &devent->rdataset);
if (devent->sigrdataset != NULL)
query_putrdataset(client, &devent->sigrdataset);
/*
* If the two pointers are the same then leave the setting of
* (*deventp) to NULL to isc_event_free.
*/
if ((void *)eventp != (void *)deventp)
(*deventp) = NULL;
isc_event_free(eventp);
}
/*%
* Check the configured trust anchors for a root zone trust anchor
* with a key id that matches client->query.root_key_sentinel_keyid.
*
* Return true when found, otherwise return false.
*/
static bool
has_ta(ns_client_t *client) {
dns_keytable_t *keytable = NULL;
dns_keynode_t *keynode = NULL;
isc_result_t result;
result = dns_view_getsecroots(client->view, &keytable);
if (result != ISC_R_SUCCESS) {
return (false);
}
result = dns_keytable_find(keytable, dns_rootname, &keynode);
while (result == ISC_R_SUCCESS) {
dns_keynode_t *nextnode = NULL;
dns_keytag_t keyid = dst_key_id(dns_keynode_key(keynode));
if (keyid == client->query.root_key_sentinel_keyid) {
dns_keytable_detachkeynode(keytable, &keynode);
dns_keytable_detach(&keytable);
return (true);
}
result = dns_keytable_nextkeynode(keytable, keynode, &nextnode);
dns_keytable_detachkeynode(keytable, &keynode);
keynode = nextnode;
}
dns_keytable_detach(&keytable);
return (false);
}
/*%
* Check if a root key sentinel SERVFAIL should be returned.
*/
static bool
root_key_sentinel_return_servfail(ns_client_t *client, bool is_zone,
dns_rdataset_t *rdataset, isc_result_t result)
{
/*
* Are we looking at a "root-key-sentinel" query?
*/
if (!client->query.root_key_sentinel_is_ta &&
!client->query.root_key_sentinel_not_ta)
{
return (false);
}
/*
* We only care about the query if 'result' indicates we have a cached
* answer.
*/
switch (result) {
case ISC_R_SUCCESS:
case DNS_R_CNAME:
case DNS_R_DNAME:
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NCACHENXRRSET:
break;
default:
return (false);
}
/*
* Do we meet the specified conditions to return SERVFAIL?
*/
if (!is_zone && rdataset->trust == dns_trust_secure &&
((client->query.root_key_sentinel_is_ta && !has_ta(client)) ||
(client->query.root_key_sentinel_not_ta && has_ta(client))))
{
return (true);
}
/*
* As special processing may only be triggered by the original QNAME,
* disable it after following a CNAME/DNAME.
*/
client->query.root_key_sentinel_is_ta = false;
client->query.root_key_sentinel_not_ta = false;
return (false);
}
static void
query_resume(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
dns_fetch_t *fetch = NULL;
ns_client_t *client;
bool fetch_canceled, client_shuttingdown;
isc_result_t result;
isc_logcategory_t *logcategory = NS_LOGCATEGORY_QUERY_ERRORS;
int errorloglevel;
/*
* Resume a query after recursion.
*/
UNUSED(task);
REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
client = devent->ev_arg;
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(task == client->task);
REQUIRE(RECURSING(client));
LOCK(&client->query.fetchlock);
if (client->query.fetch != NULL) {
/*
* This is the fetch we've been waiting for.
*/
INSIST(devent->fetch == client->query.fetch);
client->query.fetch = NULL;
fetch_canceled = false;
/*
* Update client->now.
*/
isc_stdtime_get(&client->now);
} else {
/*
* This is a fetch completion event for a canceled fetch.
* Clean up and don't resume the find.
*/
fetch_canceled = true;
}
UNLOCK(&client->query.fetchlock);
INSIST(client->query.fetch == NULL);
client->query.attributes &= ~NS_QUERYATTR_RECURSING;
SAVE(fetch, devent->fetch);
/*
* If this client is shutting down, or this transaction
* has timed out, do not resume the find.
*/
client_shuttingdown = ns_client_shuttingdown(client);
if (fetch_canceled || client_shuttingdown) {
free_devent(client, &event, &devent);
if (fetch_canceled) {
CTRACE(ISC_LOG_ERROR, "fetch cancelled");
query_error(client, DNS_R_SERVFAIL, __LINE__);
} else
query_next(client, ISC_R_CANCELED);
/*
* This may destroy the client.
*/
ns_client_detach(&client);
} else {
result = query_find(client, devent, 0);
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_SERVFAIL)
errorloglevel = ISC_LOG_DEBUG(2);
else
errorloglevel = ISC_LOG_DEBUG(4);
if (isc_log_wouldlog(ns_g_lctx, errorloglevel)) {
dns_resolver_logfetch(fetch, ns_g_lctx,
logcategory,
NS_LOGMODULE_QUERY,
errorloglevel, false);
}
}
}
dns_resolver_destroyfetch(&fetch);
}
static void
prefetch_done(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
ns_client_t *client;
UNUSED(task);
REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
client = devent->ev_arg;
REQUIRE(NS_CLIENT_VALID(client));
REQUIRE(task == client->task);
LOCK(&client->query.fetchlock);
if (client->query.prefetch != NULL) {
INSIST(devent->fetch == client->query.prefetch);
client->query.prefetch = NULL;
}
UNLOCK(&client->query.fetchlock);
free_devent(client, &event, &devent);
ns_client_detach(&client);
}
static void
query_prefetch(ns_client_t *client, dns_name_t *qname,
dns_rdataset_t *rdataset)
{
isc_result_t result;
isc_sockaddr_t *peeraddr;
dns_rdataset_t *tmprdataset;
ns_client_t *dummy = NULL;
unsigned int options;
if (client->query.prefetch != NULL ||
client->view->prefetch_trigger == 0U ||
rdataset->ttl > client->view->prefetch_trigger ||
(rdataset->attributes & DNS_RDATASETATTR_PREFETCH) == 0)
return;
if (client->recursionquota == NULL) {
result = isc_quota_attach(&ns_g_server->recursionquota,
&client->recursionquota);
if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_recursclients);
}
if (result == ISC_R_SUCCESS && !client->mortal && !TCP(client))
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS)
return;
}
tmprdataset = query_newrdataset(client);
if (tmprdataset == NULL)
return;
if (!TCP(client))
peeraddr = &client->peeraddr;
else
peeraddr = NULL;
ns_client_attach(client, &dummy);
options = client->query.fetchoptions | DNS_FETCHOPT_PREFETCH;
result = dns_resolver_createfetch3(client->view->resolver,
qname, rdataset->type, NULL, NULL,
NULL, peeraddr, client->message->id,
options, 0, NULL, client->task,
prefetch_done, client,
tmprdataset, NULL,
&client->query.prefetch);
if (result != ISC_R_SUCCESS) {
query_putrdataset(client, &tmprdataset);
ns_client_detach(&dummy);
}
dns_rdataset_clearprefetch(rdataset);
}
#if defined(ISC_PLATFORM_HAVESTDATOMIC)
static void
log_quota(ns_client_t *client, _Atomic(isc_stdtime_t) *last, isc_stdtime_t now,
const char *fmt, const char *tail)
#else
static void
log_quota(ns_client_t *client, isc_stdtime_t *last, isc_stdtime_t now,
const char *fmt, const char *tail)
#endif
{
isc_stdtime_t old = last_load(last);
if (now > old || (old + 1) > now) {
if (last_cmpxchg(last, &old, now)) {
LOCK(&ns_g_server->recursionquota.lock);
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING, fmt,
ns_g_server->recursionquota.used,
ns_g_server->recursionquota.soft,
ns_g_server->recursionquota.max,
tail);
UNLOCK(&ns_g_server->recursionquota.lock);
}
}
}
static isc_result_t
query_recurse(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
dns_name_t *qdomain, dns_rdataset_t *nameservers,
bool resuming)
{
isc_result_t result;
dns_rdataset_t *rdataset, *sigrdataset;
isc_sockaddr_t *peeraddr;
if (!resuming)
inc_stats(client, dns_nsstatscounter_recursion);
/*
* We are about to recurse, which means that this client will
* be unavailable for serving new requests for an indeterminate
* amount of time. If this client is currently responsible
* for handling incoming queries, set up a new client
* object to handle them while we are waiting for a
* response. There is no need to replace TCP clients
* because those have already been replaced when the
* connection was accepted (if allowed by the TCP quota).
*/
if (client->recursionquota == NULL) {
result = isc_quota_attach(&ns_g_server->recursionquota,
&client->recursionquota);
if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_recursclients);
}
if (result == ISC_R_SOFTQUOTA) {
#ifdef ISC_PLATFORM_HAVESTDATOMIC
static _Atomic(isc_stdtime_t) last = 0;
#else
static isc_stdtime_t last = 0;
#endif
isc_stdtime_t now;
isc_stdtime_get(&now);
log_quota(client, &last, now,
"recursive-clients soft limit exceeded "
"(%d/%d/%d) %s", "aborting oldest query");
ns_client_killoldestquery(client);
result = ISC_R_SUCCESS;
} else if (result == ISC_R_QUOTA) {
#ifdef ISC_PLATFORM_HAVESTDATOMIC
static _Atomic(isc_stdtime_t) last = 0;
#else
static isc_stdtime_t last = 0;
#endif
isc_stdtime_t now;
isc_stdtime_get(&now);
log_quota(client, &last, now,
"no more recursive clients (%d/%d/%d): %s",
isc_result_totext(result));
ns_client_killoldestquery(client);
}
if (result == ISC_R_SUCCESS && !client->mortal &&
!TCP(client)) {
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS) {
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"ns_client_replace() failed: %s",
isc_result_totext(result));
isc_quota_detach(&client->recursionquota);
isc_stats_decrement(ns_g_server->nsstats,
dns_nsstatscounter_recursclients);
}
}
if (result != ISC_R_SUCCESS)
return (result);
ns_client_recursing(client);
}
/*
* Invoke the resolver.
*/
REQUIRE(nameservers == NULL || nameservers->type == dns_rdatatype_ns);
REQUIRE(client->query.fetch == NULL);
rdataset = query_newrdataset(client);
if (rdataset == NULL)
return (ISC_R_NOMEMORY);
if (WANTDNSSEC(client)) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
query_putrdataset(client, &rdataset);
return (ISC_R_NOMEMORY);
}
} else
sigrdataset = NULL;
if (client->query.timerset == false)
ns_client_settimeout(client, 60);
if (!TCP(client))
peeraddr = &client->peeraddr;
else
peeraddr = NULL;
result = dns_resolver_createfetch3(client->view->resolver,
qname, qtype, qdomain, nameservers,
NULL, peeraddr, client->message->id,
client->query.fetchoptions, 0, NULL,
client->task, query_resume, client,
rdataset, sigrdataset,
&client->query.fetch);
if (result == ISC_R_SUCCESS) {
/*
* Record that we're waiting for an event. A client which
* is shutting down will not be destroyed until all the
* events have been received.
*/
} else {
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
}
return (result);
}
static inline void
rpz_clean(dns_zone_t **zonep, dns_db_t **dbp, dns_dbnode_t **nodep,
dns_rdataset_t **rdatasetp)
{
if (nodep != NULL && *nodep != NULL) {
REQUIRE(dbp != NULL && *dbp != NULL);
dns_db_detachnode(*dbp, nodep);
}
if (dbp != NULL && *dbp != NULL)
dns_db_detach(dbp);
if (zonep != NULL && *zonep != NULL)
dns_zone_detach(zonep);
if (rdatasetp != NULL && *rdatasetp != NULL &&
dns_rdataset_isassociated(*rdatasetp))
dns_rdataset_disassociate(*rdatasetp);
}
static inline void
rpz_match_clear(dns_rpz_st_t *st) {
rpz_clean(&st->m.zone, &st->m.db, &st->m.node, &st->m.rdataset);
st->m.version = NULL;
}
static inline isc_result_t
rpz_ready(ns_client_t *client, dns_rdataset_t **rdatasetp) {
REQUIRE(rdatasetp != NULL);
CTRACE(ISC_LOG_DEBUG(3), "rpz_ready");
if (*rdatasetp == NULL) {
*rdatasetp = query_newrdataset(client);
if (*rdatasetp == NULL) {
CTRACE(ISC_LOG_ERROR,
"rpz_ready: query_newrdataset failed");
return (DNS_R_SERVFAIL);
}
} else if (dns_rdataset_isassociated(*rdatasetp)) {
dns_rdataset_disassociate(*rdatasetp);
}
return (ISC_R_SUCCESS);
}
static void
rpz_st_clear(ns_client_t *client) {
dns_rpz_st_t *st = client->query.rpz_st;
CTRACE(ISC_LOG_DEBUG(3), "rpz_st_clear");
if (st->m.rdataset != NULL)
query_putrdataset(client, &st->m.rdataset);
rpz_match_clear(st);
rpz_clean(NULL, &st->r.db, NULL, NULL);
if (st->r.ns_rdataset != NULL)
query_putrdataset(client, &st->r.ns_rdataset);
if (st->r.r_rdataset != NULL)
query_putrdataset(client, &st->r.r_rdataset);
rpz_clean(&st->q.zone, &st->q.db, &st->q.node, NULL);
if (st->q.rdataset != NULL)
query_putrdataset(client, &st->q.rdataset);
if (st->q.sigrdataset != NULL)
query_putrdataset(client, &st->q.sigrdataset);
st->state = 0;
st->m.type = DNS_RPZ_TYPE_BAD;
st->m.policy = DNS_RPZ_POLICY_MISS;
}
static dns_rpz_zbits_t
rpz_get_zbits(ns_client_t *client,
dns_rdatatype_t ip_type, dns_rpz_type_t rpz_type)
{
dns_rpz_st_t *st;
dns_rpz_zbits_t zbits;
REQUIRE(client != NULL);
REQUIRE(client->query.rpz_st != NULL);
st = client->query.rpz_st;
switch (rpz_type) {
case DNS_RPZ_TYPE_CLIENT_IP:
zbits = st->have.client_ip;
break;
case DNS_RPZ_TYPE_QNAME:
zbits = st->have.qname;
break;
case DNS_RPZ_TYPE_IP:
if (ip_type == dns_rdatatype_a) {
zbits = st->have.ipv4;
} else if (ip_type == dns_rdatatype_aaaa) {
zbits = st->have.ipv6;
} else {
zbits = st->have.ip;
}
break;
case DNS_RPZ_TYPE_NSDNAME:
zbits = st->have.nsdname;
break;
case DNS_RPZ_TYPE_NSIP:
if (ip_type == dns_rdatatype_a) {
zbits = st->have.nsipv4;
} else if (ip_type == dns_rdatatype_aaaa) {
zbits = st->have.nsipv6;
} else {
zbits = st->have.nsip;
}
break;
default:
INSIST(0);
ISC_UNREACHABLE();
break;
}
/*
* Choose
* the earliest configured policy zone (rpz->num)
* QNAME over IP over NSDNAME over NSIP (rpz_type)
* the smallest name,
* the longest IP address prefix,
* the lexically smallest address.
*/
if (st->m.policy != DNS_RPZ_POLICY_MISS) {
if (st->m.type >= rpz_type) {
zbits &= DNS_RPZ_ZMASK(st->m.rpz->num);
} else{
zbits &= DNS_RPZ_ZMASK(st->m.rpz->num) >> 1;
}
}
/*
* If the client wants recursion, allow only compatible policies.
*/
if (!RECURSIONOK(client))
zbits &= st->popt.no_rd_ok;
return (zbits);
}
static void
query_rpzfetch(ns_client_t *client, dns_name_t *qname, dns_rdatatype_t type) {
isc_result_t result;
isc_sockaddr_t *peeraddr;
dns_rdataset_t *tmprdataset;
ns_client_t *dummy = NULL;
unsigned int options;
if (client->query.prefetch != NULL)
return;
if (client->recursionquota == NULL) {
result = isc_quota_attach(&ns_g_server->recursionquota,
&client->recursionquota);
if (result == ISC_R_SUCCESS || result == ISC_R_SOFTQUOTA) {
isc_stats_increment(ns_g_server->nsstats,
dns_nsstatscounter_recursclients);
}
if (result == ISC_R_SUCCESS && !client->mortal && !TCP(client))
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS)
return;
}
tmprdataset = query_newrdataset(client);
if (tmprdataset == NULL)
return;
if (!TCP(client))
peeraddr = &client->peeraddr;
else
peeraddr = NULL;
ns_client_attach(client, &dummy);
options = client->query.fetchoptions;
result = dns_resolver_createfetch3(client->view->resolver, qname, type,
NULL, NULL, NULL, peeraddr,
client->message->id, options, 0,
NULL, client->task, prefetch_done,
client, tmprdataset, NULL,
&client->query.prefetch);
if (result != ISC_R_SUCCESS) {
query_putrdataset(client, &tmprdataset);
ns_client_detach(&dummy);
}
}
/*
* Get an NS, A, or AAAA rrset related to the response for the client
* to check the contents of that rrset for hits by eligible policy zones.
*/
static isc_result_t
rpz_rrset_find(ns_client_t *client, dns_name_t *name, dns_rdatatype_t type,
dns_rpz_type_t rpz_type, dns_db_t **dbp,
dns_dbversion_t *version, dns_rdataset_t **rdatasetp,
bool resuming)
{
dns_rpz_st_t *st;
bool is_zone;
dns_dbnode_t *node;
dns_fixedname_t fixed;
dns_name_t *found;
isc_result_t result;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rrset_find");
st = client->query.rpz_st;
if ((st->state & DNS_RPZ_RECURSING) != 0) {
INSIST(st->r.r_type == type);
INSIST(dns_name_equal(name, st->r_name));
INSIST(*rdatasetp == NULL ||
!dns_rdataset_isassociated(*rdatasetp));
st->state &= ~DNS_RPZ_RECURSING;
RESTORE(*dbp, st->r.db);
if (*rdatasetp != NULL)
query_putrdataset(client, rdatasetp);
RESTORE(*rdatasetp, st->r.r_rdataset);
result = st->r.r_result;
if (result == DNS_R_DELEGATION) {
CTRACE(ISC_LOG_ERROR, "RPZ recursing");
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, name,
rpz_type, " rpz_rrset_find(1)", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
result = DNS_R_SERVFAIL;
}
return (result);
}
result = rpz_ready(client, rdatasetp);
if (result != ISC_R_SUCCESS) {
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (result);
}
if (*dbp != NULL) {
is_zone = false;
} else {
dns_zone_t *zone;
version = NULL;
zone = NULL;
result = query_getdb(client, name, type, 0, &zone, dbp,
&version, &is_zone);
if (result != ISC_R_SUCCESS) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, name,
rpz_type, " rpz_rrset_find(2)", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
if (zone != NULL)
dns_zone_detach(&zone);
return (result);
}
if (zone != NULL)
dns_zone_detach(&zone);
}
node = NULL;
found = dns_fixedname_initname(&fixed);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
result = dns_db_findext(*dbp, name, version, type, DNS_DBFIND_GLUEOK,
client->now, &node, found,
&cm, &ci, *rdatasetp, NULL);
if (result == DNS_R_DELEGATION && is_zone && USECACHE(client)) {
/*
* Try the cache if we're authoritative for an
* ancestor but not the domain itself.
*/
rpz_clean(NULL, dbp, &node, rdatasetp);
version = NULL;
dns_db_attach(client->view->cachedb, dbp);
result = dns_db_findext(*dbp, name, version, type,
0, client->now, &node, found,
&cm, &ci, *rdatasetp, NULL);
}
rpz_clean(NULL, dbp, &node, NULL);
if (result == DNS_R_DELEGATION) {
rpz_clean(NULL, NULL, NULL, rdatasetp);
/*
* Recurse for NS rrset or A or AAAA rrset for an NS.
* Do not recurse for addresses for the query name.
*/
if (rpz_type == DNS_RPZ_TYPE_IP) {
result = DNS_R_NXRRSET;
} else if (!client->view->rpzs->p.nsip_wait_recurse) {
query_rpzfetch(client, name, type);
result = DNS_R_NXRRSET;
} else {
dns_name_copy(name, st->r_name, NULL);
result = query_recurse(client, type, st->r_name,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
st->state |= DNS_RPZ_RECURSING;
result = DNS_R_DELEGATION;
}
}
}
return (result);
}
/*
* Compute a policy owner name, p_name, in a policy zone given the needed
* policy type and the trigger name.
*/
static isc_result_t
rpz_get_p_name(ns_client_t *client, dns_name_t *p_name,
dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type,
dns_name_t *trig_name)
{
dns_offsets_t prefix_offsets;
dns_name_t prefix, *suffix;
unsigned int first, labels;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_get_p_name");
/*
* The policy owner name consists of a suffix depending on the type
* and policy zone and a prefix that is the longest possible string
* from the trigger name that keesp the resulting policy owner name
* from being too long.
*/
switch (rpz_type) {
case DNS_RPZ_TYPE_CLIENT_IP:
suffix = &rpz->client_ip;
break;
case DNS_RPZ_TYPE_QNAME:
suffix = &rpz->origin;
break;
case DNS_RPZ_TYPE_IP:
suffix = &rpz->ip;
break;
case DNS_RPZ_TYPE_NSDNAME:
suffix = &rpz->nsdname;
break;
case DNS_RPZ_TYPE_NSIP:
suffix = &rpz->nsip;
break;
default:
INSIST(0);
ISC_UNREACHABLE();
}
/*
* Start with relative version of the full trigger name,
* and trim enough allow the addition of the suffix.
*/
dns_name_init(&prefix, prefix_offsets);
labels = dns_name_countlabels(trig_name);
first = 0;
for (;;) {
dns_name_getlabelsequence(trig_name, first, labels-first-1,
&prefix);
result = dns_name_concatenate(&prefix, suffix, p_name, NULL);
if (result == ISC_R_SUCCESS)
break;
INSIST(result == DNS_R_NAMETOOLONG);
/*
* Trim the trigger name until the combination is not too long.
*/
if (labels-first < 2) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, suffix,
rpz_type, " concatenate()", result);
return (ISC_R_FAILURE);
}
/*
* Complain once about trimming the trigger name.
*/
if (first == 0) {
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, suffix,
rpz_type, " concatenate()", result);
}
++first;
}
return (ISC_R_SUCCESS);
}
/*
* Look in policy zone rpz for a policy of rpz_type by p_name.
* The self-name (usually the client qname or an NS name) is compared with
* the target of a CNAME policy for the old style passthru encoding.
* If found, the policy is recorded in *zonep, *dbp, *versionp, *nodep,
* *rdatasetp, and *policyp.
* The target DNS type, qtype, chooses the best rdataset for *rdatasetp.
* The caller must decide if the found policy is most suitable, including
* better than a previously found policy.
* If it is best, the caller records it in client->query.rpz_st->m.
*/
static isc_result_t
rpz_find_p(ns_client_t *client, dns_name_t *self_name, dns_rdatatype_t qtype,
dns_name_t *p_name, dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type,
dns_zone_t **zonep, dns_db_t **dbp, dns_dbversion_t **versionp,
dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp,
dns_rpz_policy_t *policyp)
{
dns_fixedname_t foundf;
dns_name_t *found;
isc_result_t result;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
bool found_a = false;
REQUIRE(nodep != NULL);
CTRACE(ISC_LOG_DEBUG(3), "rpz_find_p");
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Try to find either a CNAME or the type of record demanded by the
* request from the policy zone.
*/
rpz_clean(zonep, dbp, nodep, rdatasetp);
result = rpz_ready(client, rdatasetp);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_ERROR, "rpz_ready() failed");
return (DNS_R_SERVFAIL);
}
*versionp = NULL;
result = rpz_getdb(client, p_name, rpz_type, zonep, dbp, versionp);
if (result != ISC_R_SUCCESS)
return (DNS_R_NXDOMAIN);
found = dns_fixedname_initname(&foundf);
result = dns_db_findext(*dbp, p_name, *versionp, dns_rdatatype_any, 0,
client->now, nodep, found, &cm, &ci,
*rdatasetp, NULL);
/*
* Choose the best rdataset if we found something.
*/
if (result == ISC_R_SUCCESS) {
dns_rdatasetiter_t *rdsiter;
rdsiter = NULL;
result = dns_db_allrdatasets(*dbp, *nodep, *versionp, 0,
&rdsiter);
if (result != ISC_R_SUCCESS) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, p_name,
rpz_type, " allrdatasets()", result);
CTRACE(ISC_LOG_ERROR,
"rpz_find_p: allrdatasets failed");
return (DNS_R_SERVFAIL);
}
if (qtype == dns_rdatatype_aaaa &&
!ISC_LIST_EMPTY(client->view->dns64)) {
for (result = dns_rdatasetiter_first(rdsiter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(rdsiter)) {
dns_rdatasetiter_current(rdsiter, *rdatasetp);
if ((*rdatasetp)->type == dns_rdatatype_a) {
found_a = true;
}
dns_rdataset_disassociate(*rdatasetp);
}
}
for (result = dns_rdatasetiter_first(rdsiter);
result == ISC_R_SUCCESS;
result = dns_rdatasetiter_next(rdsiter)) {
dns_rdatasetiter_current(rdsiter, *rdatasetp);
if ((*rdatasetp)->type == dns_rdatatype_cname ||
(*rdatasetp)->type == qtype)
break;
dns_rdataset_disassociate(*rdatasetp);
}
dns_rdatasetiter_destroy(&rdsiter);
if (result != ISC_R_SUCCESS) {
if (result != ISC_R_NOMORE) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
p_name, rpz_type,
" rdatasetiter", result);
CTRACE(ISC_LOG_ERROR,
"rpz_find_p: rdatasetiter failed");
return (DNS_R_SERVFAIL);
}
/*
* Ask again to get the right DNS_R_DNAME/NXRRSET/...
* result if there is neither a CNAME nor target type.
*/
if (dns_rdataset_isassociated(*rdatasetp))
dns_rdataset_disassociate(*rdatasetp);
dns_db_detachnode(*dbp, nodep);
if (qtype == dns_rdatatype_rrsig ||
qtype == dns_rdatatype_sig)
result = DNS_R_NXRRSET;
else
result = dns_db_findext(*dbp, p_name, *versionp,
qtype, 0, client->now,
nodep, found, &cm, &ci,
*rdatasetp, NULL);
}
}
switch (result) {
case ISC_R_SUCCESS:
if ((*rdatasetp)->type != dns_rdatatype_cname) {
*policyp = DNS_RPZ_POLICY_RECORD;
} else {
*policyp = dns_rpz_decode_cname(rpz, *rdatasetp,
self_name);
if ((*policyp == DNS_RPZ_POLICY_RECORD ||
*policyp == DNS_RPZ_POLICY_WILDCNAME) &&
qtype != dns_rdatatype_cname &&
qtype != dns_rdatatype_any)
return (DNS_R_CNAME);
}
return (ISC_R_SUCCESS);
case DNS_R_NXRRSET:
if (found_a) {
*policyp = DNS_RPZ_POLICY_DNS64;
} else {
*policyp = DNS_RPZ_POLICY_NODATA;
}
return (result);
case DNS_R_DNAME:
/*
* DNAME policy RRs have very few if any uses that are not
* better served with simple wildcards. Making them work would
* require complications to get the number of labels matched
* in the name or the found name to the main DNS_R_DNAME case
* in query_find(). The domain also does not appear in the
* summary database at the right level, so this happens only
* with a single policy zone when we have no summary database.
* Treat it as a miss.
*/
case DNS_R_NXDOMAIN:
case DNS_R_EMPTYNAME:
return (DNS_R_NXDOMAIN);
default:
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, p_name, rpz_type,
"", result);
CTRACE(ISC_LOG_ERROR,
"rpz_find_p: unexpected result");
return (DNS_R_SERVFAIL);
}
}
static void
rpz_save_p(dns_rpz_st_t *st, dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type,
dns_rpz_policy_t policy, dns_name_t *p_name, dns_rpz_prefix_t prefix,
isc_result_t result, dns_zone_t **zonep, dns_db_t **dbp,
dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp,
dns_dbversion_t *version)
{
dns_rdataset_t *trdataset = NULL;
rpz_match_clear(st);
st->m.rpz = rpz;
st->m.type = rpz_type;
st->m.policy = policy;
dns_name_copy(p_name, st->p_name, NULL);
st->m.prefix = prefix;
st->m.result = result;
SAVE(st->m.zone, *zonep);
SAVE(st->m.db, *dbp);
SAVE(st->m.node, *nodep);
if (*rdatasetp != NULL && dns_rdataset_isassociated(*rdatasetp)) {
/*
* Save the replacement rdataset from the policy
* and make the previous replacement rdataset scratch.
*/
SAVE(trdataset, st->m.rdataset);
SAVE(st->m.rdataset, *rdatasetp);
SAVE(*rdatasetp, trdataset);
st->m.ttl = ISC_MIN(st->m.rdataset->ttl, rpz->max_policy_ttl);
} else {
st->m.ttl = ISC_MIN(DNS_RPZ_TTL_DEFAULT, rpz->max_policy_ttl);
}
SAVE(st->m.version, version);
}
/*
* Check this address in every eligible policy zone.
*/
static isc_result_t
rpz_rewrite_ip(ns_client_t *client, const isc_netaddr_t *netaddr,
dns_rdatatype_t qtype, dns_rpz_type_t rpz_type,
dns_rpz_zbits_t zbits, dns_rdataset_t **p_rdatasetp)
{
dns_rpz_zones_t *rpzs;
dns_rpz_st_t *st;
dns_rpz_zone_t *rpz;
dns_rpz_prefix_t prefix;
dns_rpz_num_t rpz_num;
dns_fixedname_t ip_namef, p_namef;
dns_name_t *ip_name, *p_name;
dns_zone_t *p_zone;
dns_db_t *p_db;
dns_dbversion_t *p_version;
dns_dbnode_t *p_node;
dns_rpz_policy_t policy;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_ip");
ip_name = dns_fixedname_initname(&ip_namef);
p_zone = NULL;
p_db = NULL;
p_node = NULL;
rpzs = client->view->rpzs;
st = client->query.rpz_st;
while (zbits != 0) {
rpz_num = dns_rpz_find_ip(rpzs, rpz_type, zbits, netaddr,
ip_name, &prefix);
if (rpz_num == DNS_RPZ_INVALID_NUM)
break;
zbits &= (DNS_RPZ_ZMASK(rpz_num) >> 1);
/*
* Do not try applying policy zones that cannot replace a
* previously found policy zone.
* Stop looking if the next best choice cannot
* replace what we already have.
*/
rpz = rpzs->zones[rpz_num];
if (st->m.policy != DNS_RPZ_POLICY_MISS) {
if (st->m.rpz->num < rpz->num)
break;
if (st->m.rpz->num == rpz->num &&
(st->m.type < rpz_type ||
st->m.prefix > prefix))
break;
}
/*
* Get the policy for a prefix at least as long
* as the prefix of the entry we had before.
*/
p_name = dns_fixedname_initname(&p_namef);
result = rpz_get_p_name(client, p_name, rpz, rpz_type, ip_name);
if (result != ISC_R_SUCCESS)
continue;
result = rpz_find_p(client, ip_name, qtype,
p_name, rpz, rpz_type,
&p_zone, &p_db, &p_version, &p_node,
p_rdatasetp, &policy);
switch (result) {
case DNS_R_NXDOMAIN:
/*
* Continue after a policy record that is missing
* contrary to the summary data. The summary
* data can out of date during races with and among
* policy zone updates.
*/
CTRACE(ISC_LOG_ERROR,
"rpz_rewrite_ip: mismatched summary data; "
"continuing");
continue;
case DNS_R_SERVFAIL:
rpz_clean(&p_zone, &p_db, &p_node, p_rdatasetp);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
default:
/*
* Forget this policy if it is not preferable
* to the previously found policy.
* If this policy is not good, then stop looking
* because none of the later policy zones would work.
*
* With more than one applicable policy, prefer
* the earliest configured policy,
* client-IP over QNAME over IP over NSDNAME over NSIP,
* the longest prefix
* the lexically smallest address.
* dns_rpz_find_ip() ensures st->m.rpz->num >= rpz->num.
* We can compare new and current p_name because
* both are of the same type and in the same zone.
* The tests above eliminate other reasons to
* reject this policy. If this policy can't work,
* then neither can later zones.
*/
if (st->m.policy != DNS_RPZ_POLICY_MISS &&
rpz->num == st->m.rpz->num &&
(st->m.type == rpz_type &&
st->m.prefix == prefix &&
0 > dns_name_rdatacompare(st->p_name, p_name)))
break;
/*
* Stop checking after saving an enabled hit in this
* policy zone. The radix tree in the policy zone
* ensures that we found the longest match.
*/
if (rpz->policy != DNS_RPZ_POLICY_DISABLED) {
CTRACE(ISC_LOG_DEBUG(3),
"rpz_rewrite_ip: rpz_save_p");
rpz_save_p(st, rpz, rpz_type,
policy, p_name, prefix, result,
&p_zone, &p_db, &p_node,
p_rdatasetp, p_version);
break;
}
/*
* Log DNS_RPZ_POLICY_DISABLED zones
* and try the next eligible policy zone.
*/
rpz_log_rewrite(client, true, policy, rpz_type,
p_zone, p_name, NULL, rpz_num);
}
}
rpz_clean(&p_zone, &p_db, &p_node, p_rdatasetp);
return (ISC_R_SUCCESS);
}
/*
* Check the IP addresses in the A or AAAA rrsets for name against
* all eligible rpz_type (IP or NSIP) response policy rewrite rules.
*/
static isc_result_t
rpz_rewrite_ip_rrset(ns_client_t *client,
dns_name_t *name, dns_rdatatype_t qtype,
dns_rpz_type_t rpz_type, dns_rdatatype_t ip_type,
dns_db_t **ip_dbp, dns_dbversion_t *ip_version,
dns_rdataset_t **ip_rdatasetp,
dns_rdataset_t **p_rdatasetp, bool resuming)
{
dns_rpz_zbits_t zbits;
isc_netaddr_t netaddr;
struct in_addr ina;
struct in6_addr in6a;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_ip_rrset");
zbits = rpz_get_zbits(client, ip_type, rpz_type);
if (zbits == 0)
return (ISC_R_SUCCESS);
/*
* Get the A or AAAA rdataset.
*/
result = rpz_rrset_find(client, name, ip_type, rpz_type, ip_dbp,
ip_version, ip_rdatasetp, resuming);
switch (result) {
case ISC_R_SUCCESS:
case DNS_R_GLUE:
case DNS_R_ZONECUT:
break;
case DNS_R_EMPTYNAME:
case DNS_R_EMPTYWILD:
case DNS_R_NXDOMAIN:
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NXRRSET:
case DNS_R_NCACHENXRRSET:
case ISC_R_NOTFOUND:
return (ISC_R_SUCCESS);
case DNS_R_DELEGATION:
case DNS_R_DUPLICATE:
case DNS_R_DROP:
return (result);
case DNS_R_CNAME:
case DNS_R_DNAME:
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, name, rpz_type,
" NS address rewrite rrset", result);
return (ISC_R_SUCCESS);
default:
if (client->query.rpz_st->m.policy != DNS_RPZ_POLICY_ERROR) {
client->query.rpz_st->m.policy = DNS_RPZ_POLICY_ERROR;
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, name,
rpz_type, " NS address rewrite rrset",
result);
}
CTRACE(ISC_LOG_ERROR,
"rpz_rewrite_ip_rrset: unexpected result");
return (DNS_R_SERVFAIL);
}
/*
* Check all of the IP addresses in the rdataset.
*/
for (result = dns_rdataset_first(*ip_rdatasetp);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(*ip_rdatasetp)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_current(*ip_rdatasetp, &rdata);
switch (rdata.type) {
case dns_rdatatype_a:
INSIST(rdata.length == 4);
memmove(&ina.s_addr, rdata.data, 4);
isc_netaddr_fromin(&netaddr, &ina);
break;
case dns_rdatatype_aaaa:
INSIST(rdata.length == 16);
memmove(in6a.s6_addr, rdata.data, 16);
isc_netaddr_fromin6(&netaddr, &in6a);
break;
default:
continue;
}
result = rpz_rewrite_ip(client, &netaddr, qtype, rpz_type,
zbits, p_rdatasetp);
if (result != ISC_R_SUCCESS)
return (result);
}
return (ISC_R_SUCCESS);
}
/*
* Look for IP addresses in A and AAAA rdatasets
* that trigger all eligible IP or NSIP policy rules.
*/
static isc_result_t
rpz_rewrite_ip_rrsets(ns_client_t *client, dns_name_t *name,
dns_rdatatype_t qtype, dns_rpz_type_t rpz_type,
dns_rdataset_t **ip_rdatasetp, bool resuming)
{
dns_rpz_st_t *st;
dns_dbversion_t *ip_version;
dns_db_t *ip_db;
dns_rdataset_t *p_rdataset;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_ip_rrsets");
st = client->query.rpz_st;
ip_version = NULL;
ip_db = NULL;
p_rdataset = NULL;
if ((st->state & DNS_RPZ_DONE_IPv4) == 0 &&
(qtype == dns_rdatatype_a ||
qtype == dns_rdatatype_any ||
rpz_type == DNS_RPZ_TYPE_NSIP)) {
/*
* Rewrite based on an IPv4 address that will appear
* in the ANSWER section or if we are checking IP addresses.
*/
result = rpz_rewrite_ip_rrset(client, name, qtype,
rpz_type, dns_rdatatype_a,
&ip_db, ip_version, ip_rdatasetp,
&p_rdataset, resuming);
if (result == ISC_R_SUCCESS)
st->state |= DNS_RPZ_DONE_IPv4;
} else {
result = ISC_R_SUCCESS;
}
if (result == ISC_R_SUCCESS &&
(qtype == dns_rdatatype_aaaa ||
qtype == dns_rdatatype_any ||
rpz_type == DNS_RPZ_TYPE_NSIP)) {
/*
* Rewrite based on IPv6 addresses that will appear
* in the ANSWER section or if we are checking IP addresses.
*/
result = rpz_rewrite_ip_rrset(client, name, qtype,
rpz_type, dns_rdatatype_aaaa,
&ip_db, ip_version, ip_rdatasetp,
&p_rdataset, resuming);
}
if (ip_db != NULL)
dns_db_detach(&ip_db);
query_putrdataset(client, &p_rdataset);
return (result);
}
/*
* Try to rewrite a request for a qtype rdataset based on the trigger name
* trig_name and rpz_type (DNS_RPZ_TYPE_QNAME or DNS_RPZ_TYPE_NSDNAME).
* Record the results including the replacement rdataset if any
* in client->query.rpz_st.
* *rdatasetp is a scratch rdataset.
*/
static isc_result_t
rpz_rewrite_name(ns_client_t *client, dns_name_t *trig_name,
dns_rdatatype_t qtype, dns_rpz_type_t rpz_type,
dns_rpz_zbits_t allowed_zbits, dns_rdataset_t **rdatasetp)
{
dns_rpz_zones_t *rpzs;
dns_rpz_zone_t *rpz;
dns_rpz_st_t *st;
dns_fixedname_t p_namef;
dns_name_t *p_name;
dns_rpz_zbits_t zbits;
dns_rpz_num_t rpz_num;
dns_zone_t *p_zone;
dns_db_t *p_db;
dns_dbversion_t *p_version;
dns_dbnode_t *p_node;
dns_rpz_policy_t policy;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_name");
zbits = rpz_get_zbits(client, qtype, rpz_type);
zbits &= allowed_zbits;
if (zbits == 0)
return (ISC_R_SUCCESS);
rpzs = client->view->rpzs;
/*
* Use the summary database to find the bit mask of policy zones
* with policies for this trigger name. We do this even if there
* is only one eligible policy zone so that wildcard triggers
* are matched correctly, and not into their parent.
*/
zbits = dns_rpz_find_name(rpzs, rpz_type, zbits, trig_name);
if (zbits == 0)
return (ISC_R_SUCCESS);
p_name = dns_fixedname_initname(&p_namef);
p_zone = NULL;
p_db = NULL;
p_node = NULL;
st = client->query.rpz_st;
/*
* Check the trigger name in every policy zone that the summary data
* says has a hit for the trigger name.
* Most of the time there are no eligible zones and the summary data
* keeps us from getting this far.
* We check the most eligible zone first and so usually check only
* one policy zone.
*/
for (rpz_num = 0; zbits != 0; ++rpz_num, zbits >>= 1) {
if ((zbits & 1) == 0)
continue;
/*
* Do not check policy zones that cannot replace a previously
* found policy.
*/
rpz = rpzs->zones[rpz_num];
if (st->m.policy != DNS_RPZ_POLICY_MISS) {
if (st->m.rpz->num < rpz->num)
break;
if (st->m.rpz->num == rpz->num &&
st->m.type < rpz_type)
break;
}
/*
* Get the next policy zone's record for this trigger name.
*/
result = rpz_get_p_name(client, p_name, rpz, rpz_type,
trig_name);
if (result != ISC_R_SUCCESS)
continue;
result = rpz_find_p(client, trig_name, qtype, p_name,
rpz, rpz_type,
&p_zone, &p_db, &p_version, &p_node,
rdatasetp, &policy);
switch (result) {
case DNS_R_NXDOMAIN:
/*
* Continue after a missing policy record
* contrary to the summary data. The summary
* data can out of date during races with and among
* policy zone updates.
*/
CTRACE(ISC_LOG_ERROR,
"rpz_rewrite_name: mismatched summary data; "
"continuing");
continue;
case DNS_R_SERVFAIL:
rpz_clean(&p_zone, &p_db, &p_node, rdatasetp);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
default:
/*
* With more than one applicable policy, prefer
* the earliest configured policy,
* client-IP over QNAME over IP over NSDNAME over NSIP,
* and the smallest name.
* We known st->m.rpz->num >= rpz->num and either
* st->m.rpz->num > rpz->num or st->m.type >= rpz_type
*/
if (st->m.policy != DNS_RPZ_POLICY_MISS &&
rpz->num == st->m.rpz->num &&
(st->m.type < rpz_type ||
(st->m.type == rpz_type &&
0 >= dns_name_compare(p_name, st->p_name))))
continue;
#if 0
/*
* This code would block a customer reported information
* leak of rpz rules by rewriting requests in the
* rpz-ip, rpz-nsip, rpz-nsdname,and rpz-passthru TLDs.
* Without this code, a bad guy could request
* 24.0.3.2.10.rpz-ip. to find the policy rule for
* 10.2.3.0/14. It is an insignificant leak and this
* code is not worth its cost, because the bad guy
* could publish "evil.com A 10.2.3.4" and request
* evil.com to get the same information.
* Keep code with "#if 0" in case customer demand
* is irresistible.
*
* We have the less frequent case of a triggered
* policy. Check that we have not trigger on one
* of the pretend RPZ TLDs.
* This test would make it impossible to rewrite
* names in TLDs that start with "rpz-" should
* ICANN ever allow such TLDs.
*/
unsigned int labels;
labels = dns_name_countlabels(trig_name);
if (labels >= 2) {
dns_label_t label;
dns_name_getlabel(trig_name, labels-2, &label);
if (label.length >= sizeof(DNS_RPZ_PREFIX)-1 &&
strncasecmp((const char *)label.base+1,
DNS_RPZ_PREFIX,
sizeof(DNS_RPZ_PREFIX)-1) == 0)
continue;
}
#endif
if (rpz->policy != DNS_RPZ_POLICY_DISABLED) {
CTRACE(ISC_LOG_DEBUG(3),
"rpz_rewrite_name: rpz_save_p");
rpz_save_p(st, rpz, rpz_type,
policy, p_name, 0, result,
&p_zone, &p_db, &p_node,
rdatasetp, p_version);
/*
* After a hit, higher numbered policy zones
* are irrelevant
*/
rpz_clean(&p_zone, &p_db, &p_node, rdatasetp);
return (ISC_R_SUCCESS);
}
/*
* Log DNS_RPZ_POLICY_DISABLED zones
* and try the next eligible policy zone.
*/
rpz_log_rewrite(client, true, policy, rpz_type,
p_zone, p_name, NULL, rpz_num);
break;
}
}
rpz_clean(&p_zone, &p_db, &p_node, rdatasetp);
return (ISC_R_SUCCESS);
}
static void
rpz_rewrite_ns_skip(ns_client_t *client, dns_name_t *nsname,
isc_result_t result, int level, const char *str)
{
dns_rpz_st_t *st;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_ns_skip");
st = client->query.rpz_st;
if (str != NULL)
rpz_log_fail_helper(client, level, nsname,
DNS_RPZ_TYPE_NSIP, DNS_RPZ_TYPE_NSDNAME,
str, result);
if (st->r.ns_rdataset != NULL &&
dns_rdataset_isassociated(st->r.ns_rdataset))
dns_rdataset_disassociate(st->r.ns_rdataset);
st->r.label--;
}
/*
* RPZ query result types
*/
typedef enum {
RPZ_QRESULT_TYPE_DONE,
RPZ_QRESULT_TYPE_RESTART,
RPZ_QRESULT_TYPE_RECURSE,
} rpz_qresult_type_t;
/*
* Look for response policy zone QNAME, NSIP, and NSDNAME rewriting.
*/
static isc_result_t
rpz_rewrite(ns_client_t *client, dns_rdatatype_t qtype,
isc_result_t qresult, bool resuming,
dns_rdataset_t *ordataset, dns_rdataset_t *osigset)
{
dns_rpz_zones_t *rpzs;
dns_rpz_st_t *st;
dns_rdataset_t *rdataset;
dns_fixedname_t nsnamef;
dns_name_t *nsname;
rpz_qresult_type_t qresult_type;
dns_rpz_zbits_t zbits;
isc_result_t result = ISC_R_SUCCESS;
dns_rpz_have_t have;
dns_rpz_popt_t popt;
int rpz_ver;
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite");
rpzs = client->view->rpzs;
st = client->query.rpz_st;
if (rpzs == NULL ||
(st != NULL && (st->state & DNS_RPZ_REWRITTEN) != 0))
return (DNS_R_DISALLOWED);
RWLOCK(&rpzs->search_lock, isc_rwlocktype_read);
if (rpzs->p.num_zones == 0 ||
(!RECURSIONOK(client) && rpzs->p.no_rd_ok == 0) ||
!rpz_ck_dnssec(client, qresult, ordataset, osigset))
{
RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read);
return (DNS_R_DISALLOWED);
}
have = rpzs->have;
popt = rpzs->p;
rpz_ver = rpzs->rpz_ver;
RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read);
if (st == NULL) {
st = isc_mem_get(client->mctx, sizeof(*st));
if (st == NULL)
return (ISC_R_NOMEMORY);
st->state = 0;
}
if (st->state == 0) {
st->state |= DNS_RPZ_ACTIVE;
memset(&st->m, 0, sizeof(st->m));
st->m.type = DNS_RPZ_TYPE_BAD;
st->m.policy = DNS_RPZ_POLICY_MISS;
st->m.ttl = ~0;
memset(&st->r, 0, sizeof(st->r));
memset(&st->q, 0, sizeof(st->q));
st->p_name = dns_fixedname_initname(&st->_p_namef);
st->r_name = dns_fixedname_initname(&st->_r_namef);
st->fname = dns_fixedname_initname(&st->_fnamef);
st->have = have;
st->popt = popt;
st->rpz_ver = rpz_ver;
client->query.rpz_st = st;
}
/*
* There is nothing to rewrite if the main query failed.
*/
switch (qresult) {
case ISC_R_SUCCESS:
case DNS_R_GLUE:
case DNS_R_ZONECUT:
qresult_type = RPZ_QRESULT_TYPE_DONE;
break;
case DNS_R_EMPTYNAME:
case DNS_R_NXRRSET:
case DNS_R_NXDOMAIN:
case DNS_R_EMPTYWILD:
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NCACHENXRRSET:
case DNS_R_CNAME:
case DNS_R_DNAME:
qresult_type = RPZ_QRESULT_TYPE_RESTART;
break;
case DNS_R_DELEGATION:
case ISC_R_NOTFOUND:
/*
* If recursion is on, do only tentative rewriting.
* If recursion is off, this the normal and only time we
* can rewrite.
*/
if (RECURSIONOK(client))
qresult_type = RPZ_QRESULT_TYPE_RECURSE;
else
qresult_type = RPZ_QRESULT_TYPE_RESTART;
break;
case ISC_R_FAILURE:
case ISC_R_TIMEDOUT:
case DNS_R_BROKENCHAIN:
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL3, client->query.qname,
DNS_RPZ_TYPE_QNAME,
" stop on qresult in rpz_rewrite()", qresult);
return (ISC_R_SUCCESS);
default:
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, client->query.qname,
DNS_RPZ_TYPE_QNAME,
" stop on unrecognized qresult in rpz_rewrite()",
qresult);
return (ISC_R_SUCCESS);
}
rdataset = NULL;
if ((st->state & (DNS_RPZ_DONE_CLIENT_IP | DNS_RPZ_DONE_QNAME)) !=
(DNS_RPZ_DONE_CLIENT_IP | DNS_RPZ_DONE_QNAME)) {
isc_netaddr_t netaddr;
dns_rpz_zbits_t allowed;
if (qresult_type == RPZ_QRESULT_TYPE_RECURSE) {
/*
* This request needs recursion that has not been done.
* Get bits for the policy zones that do not need
* to wait for the results of recursion.
*/
allowed = st->have.qname_skip_recurse;
if (allowed == 0)
return (ISC_R_SUCCESS);
} else {
allowed = DNS_RPZ_ALL_ZBITS;
}
/*
* Check once for triggers for the client IP address.
*/
if ((st->state & DNS_RPZ_DONE_CLIENT_IP) == 0) {
zbits = rpz_get_zbits(client, dns_rdatatype_none,
DNS_RPZ_TYPE_CLIENT_IP);
zbits &= allowed;
if (zbits != 0) {
isc_netaddr_fromsockaddr(&netaddr,
&client->peeraddr);
result = rpz_rewrite_ip(client, &netaddr, qtype,
DNS_RPZ_TYPE_CLIENT_IP,
zbits, &rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
}
}
/*
* Check triggers for the query name if this is the first time
* for the current qname.
* There is a first time for each name in a CNAME chain
*/
if ((st->state & DNS_RPZ_DONE_QNAME) == 0) {
result = rpz_rewrite_name(client, client->query.qname,
qtype, DNS_RPZ_TYPE_QNAME,
allowed, &rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Check IPv4 addresses in A RRs next.
* Reset to the start of the NS names.
*/
st->r.label = dns_name_countlabels(client->query.qname);
st->state &= ~(DNS_RPZ_DONE_QNAME_IP |
DNS_RPZ_DONE_IPv4);
}
/*
* Quit if this was an attempt to find a qname or
* client-IP trigger before recursion.
* We will be back if no pre-recursion triggers hit.
* For example, consider 2 policy zones, both with qname and
* IP address triggers. If the qname misses the 1st zone,
* then we cannot know whether a hit for the qname in the
* 2nd zone matters until after recursing to get the A RRs and
* testing them in the first zone.
* Do not bother saving the work from this attempt,
* because recursion is so slow.
*/
if (qresult_type == RPZ_QRESULT_TYPE_RECURSE)
goto cleanup;
/*
* DNS_RPZ_DONE_QNAME but not DNS_RPZ_DONE_CLIENT_IP
* is reset at the end of dealing with each CNAME.
*/
st->state |= (DNS_RPZ_DONE_CLIENT_IP | DNS_RPZ_DONE_QNAME);
}
/*
* Check known IP addresses for the query name if the database
* lookup resulted in some addresses (qresult_type ==
* RPZ_QRESULT_TYPE_DONE) and if we have not already checked them.
* Any recursion required for the query has already happened.
* Do not check addresses that will not be in the ANSWER section.
*/
if ((st->state & DNS_RPZ_DONE_QNAME_IP) == 0 &&
qresult_type == RPZ_QRESULT_TYPE_DONE &&
rpz_get_zbits(client, qtype, DNS_RPZ_TYPE_IP) != 0) {
result = rpz_rewrite_ip_rrsets(client,
client->query.qname, qtype,
DNS_RPZ_TYPE_IP,
&rdataset, resuming);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* We are finished checking the IP addresses for the qname.
* Start with IPv4 if we will check NS IP addresses.
*/
st->state |= DNS_RPZ_DONE_QNAME_IP;
st->state &= ~DNS_RPZ_DONE_IPv4;
}
/*
* Stop looking for rules if there are none of the other kinds
* that could override what we already have.
*/
if (rpz_get_zbits(client, dns_rdatatype_any,
DNS_RPZ_TYPE_NSDNAME) == 0 &&
rpz_get_zbits(client, dns_rdatatype_any,
DNS_RPZ_TYPE_NSIP) == 0) {
result = ISC_R_SUCCESS;
goto cleanup;
}
dns_fixedname_init(&nsnamef);
dns_name_clone(client->query.qname, dns_fixedname_name(&nsnamef));
while (st->r.label > st->popt.min_ns_labels) {
/*
* Get NS rrset for each domain in the current qname.
*/
if (st->r.label == dns_name_countlabels(client->query.qname)) {
nsname = client->query.qname;
} else {
nsname = dns_fixedname_name(&nsnamef);
dns_name_split(client->query.qname, st->r.label,
NULL, nsname);
}
if (st->r.ns_rdataset == NULL ||
!dns_rdataset_isassociated(st->r.ns_rdataset))
{
dns_db_t *db = NULL;
result = rpz_rrset_find(client, nsname,
dns_rdatatype_ns,
DNS_RPZ_TYPE_NSDNAME,
&db, NULL, &st->r.ns_rdataset,
resuming);
if (db != NULL)
dns_db_detach(&db);
if (st->m.policy == DNS_RPZ_POLICY_ERROR)
goto cleanup;
switch (result) {
case ISC_R_SUCCESS:
result = dns_rdataset_first(st->r.ns_rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
st->state &= ~(DNS_RPZ_DONE_NSDNAME |
DNS_RPZ_DONE_IPv4);
break;
case DNS_R_DELEGATION:
case DNS_R_DUPLICATE:
case DNS_R_DROP:
goto cleanup;
case DNS_R_EMPTYNAME:
case DNS_R_NXRRSET:
case DNS_R_EMPTYWILD:
case DNS_R_NXDOMAIN:
case DNS_R_NCACHENXDOMAIN:
case DNS_R_NCACHENXRRSET:
case ISC_R_NOTFOUND:
case DNS_R_CNAME:
case DNS_R_DNAME:
rpz_rewrite_ns_skip(client, nsname, result,
0, NULL);
continue;
case ISC_R_TIMEDOUT:
case DNS_R_BROKENCHAIN:
case ISC_R_FAILURE:
rpz_rewrite_ns_skip(client, nsname, result,
DNS_RPZ_DEBUG_LEVEL3,
" NS rpz_rrset_find()");
continue;
default:
rpz_rewrite_ns_skip(client, nsname, result,
DNS_RPZ_INFO_LEVEL,
" unrecognized NS"
" rpz_rrset_find()");
continue;
}
}
/*
* Check all NS names.
*/
do {
dns_rdata_ns_t ns;
dns_rdata_t nsrdata = DNS_RDATA_INIT;
dns_rdataset_current(st->r.ns_rdataset, &nsrdata);
result = dns_rdata_tostruct(&nsrdata, &ns, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&nsrdata);
/*
* Do nothing about "NS ."
*/
if (dns_name_equal(&ns.name, dns_rootname)) {
dns_rdata_freestruct(&ns);
result = dns_rdataset_next(st->r.ns_rdataset);
continue;
}
/*
* Check this NS name if we did not handle it
* during a previous recursion.
*/
if ((st->state & DNS_RPZ_DONE_NSDNAME) == 0) {
result = rpz_rewrite_name(client, &ns.name,
qtype,
DNS_RPZ_TYPE_NSDNAME,
DNS_RPZ_ALL_ZBITS,
&rdataset);
if (result != ISC_R_SUCCESS) {
dns_rdata_freestruct(&ns);
goto cleanup;
}
st->state |= DNS_RPZ_DONE_NSDNAME;
}
/*
* Check all IP addresses for this NS name.
*/
result = rpz_rewrite_ip_rrsets(client, &ns.name, qtype,
DNS_RPZ_TYPE_NSIP,
&rdataset, resuming);
dns_rdata_freestruct(&ns);
if (result != ISC_R_SUCCESS)
goto cleanup;
st->state &= ~(DNS_RPZ_DONE_NSDNAME |
DNS_RPZ_DONE_IPv4);
result = dns_rdataset_next(st->r.ns_rdataset);
} while (result == ISC_R_SUCCESS);
dns_rdataset_disassociate(st->r.ns_rdataset);
st->r.label--;
if (rpz_get_zbits(client, dns_rdatatype_any,
DNS_RPZ_TYPE_NSDNAME) == 0 &&
rpz_get_zbits(client, dns_rdatatype_any,
DNS_RPZ_TYPE_NSIP) == 0)
break;
}
/*
* Use the best hit, if any.
*/
result = ISC_R_SUCCESS;
cleanup:
if (st->m.policy != DNS_RPZ_POLICY_MISS &&
st->m.policy != DNS_RPZ_POLICY_ERROR &&
st->m.rpz->policy != DNS_RPZ_POLICY_GIVEN)
st->m.policy = st->m.rpz->policy;
if (st->m.policy == DNS_RPZ_POLICY_MISS ||
st->m.policy == DNS_RPZ_POLICY_PASSTHRU ||
st->m.policy == DNS_RPZ_POLICY_ERROR) {
if (st->m.policy == DNS_RPZ_POLICY_PASSTHRU &&
result != DNS_R_DELEGATION)
rpz_log_rewrite(client, false, st->m.policy,
st->m.type, st->m.zone, st->p_name,
NULL, st->m.rpz->num);
rpz_match_clear(st);
}
if (st->m.policy == DNS_RPZ_POLICY_ERROR) {
CTRACE(ISC_LOG_ERROR, "SERVFAIL due to RPZ policy");
st->m.type = DNS_RPZ_TYPE_BAD;
result = DNS_R_SERVFAIL;
}
query_putrdataset(client, &rdataset);
if ((st->state & DNS_RPZ_RECURSING) == 0)
rpz_clean(NULL, &st->r.db, NULL, &st->r.ns_rdataset);
return (result);
}
/*
* See if response policy zone rewriting is allowed by a lack of interest
* by the client in DNSSEC or a lack of signatures.
*/
static bool
rpz_ck_dnssec(ns_client_t *client, isc_result_t qresult,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
dns_fixedname_t fixed;
dns_name_t *found;
dns_rdataset_t trdataset;
dns_rdatatype_t type;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_ck_dnssec");
if (client->view->rpzs->p.break_dnssec || !WANTDNSSEC(client))
return (true);
/*
* We do not know if there are signatures if we have not recursed
* for them.
*/
if (qresult == DNS_R_DELEGATION || qresult == ISC_R_NOTFOUND)
return (false);
if (sigrdataset == NULL)
return (true);
if (dns_rdataset_isassociated(sigrdataset))
return (false);
/*
* We are happy to rewrite nothing.
*/
if (rdataset == NULL || !dns_rdataset_isassociated(rdataset))
return (true);
/*
* Do not rewrite if there is any sign of signatures.
*/
if (rdataset->type == dns_rdatatype_nsec ||
rdataset->type == dns_rdatatype_nsec3 ||
rdataset->type == dns_rdatatype_rrsig)
return (false);
/*
* Look for a signature in a negative cache rdataset.
*/
if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) == 0)
return (true);
found = dns_fixedname_initname(&fixed);
dns_rdataset_init(&trdataset);
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_ncache_current(rdataset, found, &trdataset);
type = trdataset.type;
dns_rdataset_disassociate(&trdataset);
if (type == dns_rdatatype_nsec ||
type == dns_rdatatype_nsec3 ||
type == dns_rdatatype_rrsig)
return (false);
}
return (true);
}
/*
* Add a CNAME to the query response, including translating foo.evil.com and
* *.evil.com CNAME *.example.com
* to
* foo.evil.com CNAME foo.evil.com.example.com
*/
static isc_result_t
rpz_add_cname(ns_client_t *client, dns_rpz_st_t *st,
dns_name_t *cname, dns_name_t *fname, isc_buffer_t *dbuf)
{
dns_fixedname_t prefix, suffix;
unsigned int labels;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "rpz_add_cname");
labels = dns_name_countlabels(cname);
if (labels > 2 && dns_name_iswildcard(cname)) {
dns_fixedname_init(&prefix);
dns_name_split(client->query.qname, 1,
dns_fixedname_name(&prefix), NULL);
dns_fixedname_init(&suffix);
dns_name_split(cname, labels-1,
NULL, dns_fixedname_name(&suffix));
result = dns_name_concatenate(dns_fixedname_name(&prefix),
dns_fixedname_name(&suffix),
fname, NULL);
if (result == DNS_R_NAMETOOLONG)
client->message->rcode = dns_rcode_yxdomain;
} else {
result = dns_name_copy(cname, fname, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
if (result != ISC_R_SUCCESS)
return (result);
query_keepname(client, fname, dbuf);
result = query_add_cname(client, client->query.qname,
fname, dns_trust_authanswer, st->m.ttl);
if (result != ISC_R_SUCCESS)
return (result);
rpz_log_rewrite(client, false, st->m.policy,
st->m.type, st->m.zone, st->p_name, fname,
st->m.rpz->num);
ns_client_qnamereplace(client, fname);
/*
* Turn off DNSSEC because the results of a
* response policy zone cannot verify.
*/
client->attributes &= ~(NS_CLIENTATTR_WANTDNSSEC |
NS_CLIENTATTR_WANTAD);
return (ISC_R_SUCCESS);
}
#define MAX_RESTARTS 16
#define QUERY_ERROR(r) \
do { \
eresult = r; \
want_restart = false; \
line = __LINE__; \
} while (0)
#define RECURSE_ERROR(r) \
do { \
if ((r) == DNS_R_DUPLICATE || (r) == DNS_R_DROP) \
QUERY_ERROR(r); \
else \
QUERY_ERROR(DNS_R_SERVFAIL); \
} while (0)
/*
* Extract a network address from the RDATA of an A or AAAA
* record.
*
* Returns:
* ISC_R_SUCCESS
* ISC_R_NOTIMPLEMENTED The rdata is not a known address type.
*/
static isc_result_t
rdata_tonetaddr(const dns_rdata_t *rdata, isc_netaddr_t *netaddr) {
struct in_addr ina;
struct in6_addr in6a;
switch (rdata->type) {
case dns_rdatatype_a:
INSIST(rdata->length == 4);
memmove(&ina.s_addr, rdata->data, 4);
isc_netaddr_fromin(netaddr, &ina);
return (ISC_R_SUCCESS);
case dns_rdatatype_aaaa:
INSIST(rdata->length == 16);
memmove(in6a.s6_addr, rdata->data, 16);
isc_netaddr_fromin6(netaddr, &in6a);
return (ISC_R_SUCCESS);
default:
return (ISC_R_NOTIMPLEMENTED);
}
}
/*
* Find the sort order of 'rdata' in the topology-like
* ACL forming the second element in a 2-element top-level
* sortlist statement.
*/
static int
query_sortlist_order_2element(const dns_rdata_t *rdata, const void *arg) {
isc_netaddr_t netaddr;
if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
return (INT_MAX);
return (ns_sortlist_addrorder2(&netaddr, arg));
}
/*
* Find the sort order of 'rdata' in the matching element
* of a 1-element top-level sortlist statement.
*/
static int
query_sortlist_order_1element(const dns_rdata_t *rdata, const void *arg) {
isc_netaddr_t netaddr;
if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
return (INT_MAX);
return (ns_sortlist_addrorder1(&netaddr, arg));
}
/*
* Find the sortlist statement that applies to 'client' and set up
* the sortlist info in in client->message appropriately.
*/
static void
setup_query_sortlist(ns_client_t *client) {
isc_netaddr_t netaddr;
dns_rdatasetorderfunc_t order = NULL;
const void *order_arg = NULL;
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
switch (ns_sortlist_setup(client->view->sortlist,
&netaddr, &order_arg)) {
case NS_SORTLISTTYPE_1ELEMENT:
order = query_sortlist_order_1element;
break;
case NS_SORTLISTTYPE_2ELEMENT:
order = query_sortlist_order_2element;
break;
case NS_SORTLISTTYPE_NONE:
order = NULL;
break;
default:
INSIST(0);
ISC_UNREACHABLE();
break;
}
dns_message_setsortorder(client->message, order, order_arg);
}
static void
query_addnoqnameproof(ns_client_t *client, dns_rdataset_t *rdataset) {
isc_buffer_t *dbuf, b;
dns_name_t *fname;
dns_rdataset_t *neg, *negsig;
isc_result_t result = ISC_R_NOMEMORY;
CTRACE(ISC_LOG_DEBUG(3), "query_addnoqnameproof");
fname = NULL;
neg = NULL;
negsig = NULL;
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
neg = query_newrdataset(client);
negsig = query_newrdataset(client);
if (fname == NULL || neg == NULL || negsig == NULL)
goto cleanup;
result = dns_rdataset_getnoqname(rdataset, fname, neg, negsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_addrrset(client, &fname, &neg, &negsig, dbuf,
DNS_SECTION_AUTHORITY);
if ((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) == 0)
goto cleanup;
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL)
goto cleanup;
fname = query_newname(client, dbuf, &b);
}
if (neg == NULL)
neg = query_newrdataset(client);
else if (dns_rdataset_isassociated(neg))
dns_rdataset_disassociate(neg);
if (negsig == NULL)
negsig = query_newrdataset(client);
else if (dns_rdataset_isassociated(negsig))
dns_rdataset_disassociate(negsig);
if (fname == NULL || neg == NULL || negsig == NULL)
goto cleanup;
result = dns_rdataset_getclosest(rdataset, fname, neg, negsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_addrrset(client, &fname, &neg, &negsig, dbuf,
DNS_SECTION_AUTHORITY);
cleanup:
if (neg != NULL)
query_putrdataset(client, &neg);
if (negsig != NULL)
query_putrdataset(client, &negsig);
if (fname != NULL)
query_releasename(client, &fname);
}
static inline void
answer_in_glue(ns_client_t *client, dns_rdatatype_t qtype) {
dns_name_t *name;
dns_message_t *msg;
dns_section_t section = DNS_SECTION_ADDITIONAL;
dns_rdataset_t *rdataset = NULL;
msg = client->message;
for (name = ISC_LIST_HEAD(msg->sections[section]);
name != NULL;
name = ISC_LIST_NEXT(name, link))
if (dns_name_equal(name, client->query.qname)) {
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link))
if (rdataset->type == qtype)
break;
break;
}
if (rdataset != NULL) {
ISC_LIST_UNLINK(msg->sections[section], name, link);
ISC_LIST_PREPEND(msg->sections[section], name, link);
ISC_LIST_UNLINK(name->list, rdataset, link);
ISC_LIST_PREPEND(name->list, rdataset, link);
rdataset->attributes |= DNS_RDATASETATTR_REQUIRED;
}
}
static unsigned char inaddr10_offsets[] = { 0, 3, 11, 16 };
static unsigned char inaddr172_offsets[] = { 0, 3, 7, 15, 20 };
static unsigned char inaddr192_offsets[] = { 0, 4, 8, 16, 21 };
static unsigned char inaddr10[] = "\00210\007IN-ADDR\004ARPA";
static unsigned char inaddr16172[] = "\00216\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr17172[] = "\00217\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr18172[] = "\00218\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr19172[] = "\00219\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr20172[] = "\00220\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr21172[] = "\00221\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr22172[] = "\00222\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr23172[] = "\00223\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr24172[] = "\00224\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr25172[] = "\00225\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr26172[] = "\00226\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr27172[] = "\00227\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr28172[] = "\00228\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr29172[] = "\00229\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr30172[] = "\00230\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr31172[] = "\00231\003172\007IN-ADDR\004ARPA";
static unsigned char inaddr168192[] = "\003168\003192\007IN-ADDR\004ARPA";
static dns_name_t rfc1918names[] = {
DNS_NAME_INITABSOLUTE(inaddr10, inaddr10_offsets),
DNS_NAME_INITABSOLUTE(inaddr16172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr17172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr18172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr19172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr20172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr21172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr22172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr23172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr24172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr25172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr26172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr27172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr28172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr29172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr30172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr31172, inaddr172_offsets),
DNS_NAME_INITABSOLUTE(inaddr168192, inaddr192_offsets)
};
static unsigned char prisoner_data[] = "\010prisoner\004iana\003org";
static unsigned char hostmaster_data[] = "\012hostmaster\014root-servers\003org";
static unsigned char prisoner_offsets[] = { 0, 9, 14, 18 };
static unsigned char hostmaster_offsets[] = { 0, 11, 24, 28 };
static dns_name_t prisoner =
DNS_NAME_INITABSOLUTE(prisoner_data, prisoner_offsets);
static dns_name_t hostmaster =
DNS_NAME_INITABSOLUTE(hostmaster_data, hostmaster_offsets);
static void
warn_rfc1918(ns_client_t *client, dns_name_t *fname, dns_rdataset_t *rdataset) {
unsigned int i;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_soa_t soa;
dns_rdataset_t found;
isc_result_t result;
for (i = 0; i < (sizeof(rfc1918names)/sizeof(*rfc1918names)); i++) {
if (dns_name_issubdomain(fname, &rfc1918names[i])) {
dns_rdataset_init(&found);
result = dns_ncache_getrdataset(rdataset,
&rfc1918names[i],
dns_rdatatype_soa,
&found);
if (result != ISC_R_SUCCESS)
return;
result = dns_rdataset_first(&found);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(&found, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (dns_name_equal(&soa.origin, &prisoner) &&
dns_name_equal(&soa.contact, &hostmaster)) {
char buf[DNS_NAME_FORMATSIZE];
dns_name_format(fname, buf, sizeof(buf));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"RFC 1918 response from "
"Internet for %s", buf);
}
dns_rdataset_disassociate(&found);
return;
}
}
}
static void
query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
dns_dbversion_t *version, ns_client_t *client,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
dns_name_t *fname, bool exact,
dns_name_t *found)
{
unsigned char salt[256];
size_t salt_length;
uint16_t iterations;
isc_result_t result;
unsigned int dboptions;
dns_fixedname_t fixed;
dns_hash_t hash;
dns_name_t name;
unsigned int skip = 0, labels;
dns_rdata_nsec3_t nsec3;
dns_rdata_t rdata = DNS_RDATA_INIT;
bool optout;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
salt_length = sizeof(salt);
result = dns_db_getnsec3parameters(db, version, &hash, NULL,
&iterations, salt, &salt_length);
if (result != ISC_R_SUCCESS)
return;
dns_name_init(&name, NULL);
dns_name_clone(qname, &name);
labels = dns_name_countlabels(&name);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* Map unknown algorithm to known value.
*/
if (hash == DNS_NSEC3_UNKNOWNALG)
hash = 1;
again:
dns_fixedname_init(&fixed);
result = dns_nsec3_hashname(&fixed, NULL, NULL, &name,
dns_db_origin(db), hash,
iterations, salt, salt_length);
if (result != ISC_R_SUCCESS)
return;
dboptions = client->query.dboptions | DNS_DBFIND_FORCENSEC3;
result = dns_db_findext(db, dns_fixedname_name(&fixed), version,
dns_rdatatype_nsec3, dboptions, client->now,
NULL, fname, &cm, &ci, rdataset, sigrdataset);
if (result == DNS_R_NXDOMAIN) {
if (!dns_rdataset_isassociated(rdataset)) {
return;
}
result = dns_rdataset_first(rdataset);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &nsec3, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&rdata);
optout = (nsec3.flags & DNS_NSEC3FLAG_OPTOUT);
if (found != NULL && optout &&
dns_name_issubdomain(&name, dns_db_origin(db)))
{
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
skip++;
dns_name_getlabelsequence(qname, skip, labels - skip,
&name);
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_DEBUG(3),
"looking for closest provable encloser");
goto again;
}
if (exact)
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
"expected a exact match NSEC3, got "
"a covering record");
} else if (result != ISC_R_SUCCESS) {
return;
} else if (!exact)
ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
"expected covering NSEC3, got an exact match");
if (found == qname) {
if (skip != 0U)
dns_name_getlabelsequence(qname, skip, labels - skip,
found);
} else if (found != NULL)
dns_name_copy(&name, found, NULL);
return;
}
#ifdef ALLOW_FILTER_AAAA
static bool
is_v4_client(ns_client_t *client) {
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET)
return (true);
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&client->peeraddr.type.sin6.sin6_addr))
return (true);
return (false);
}
static bool
is_v6_client(ns_client_t *client) {
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET6 &&
!IN6_IS_ADDR_V4MAPPED(&client->peeraddr.type.sin6.sin6_addr))
return (true);
return (false);
}
#endif
static uint32_t
dns64_ttl(dns_db_t *db, dns_dbversion_t *version) {
dns_dbnode_t *node = NULL;
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdataset_t rdataset;
isc_result_t result;
uint32_t ttl = UINT32_MAX;
dns_rdataset_init(&rdataset);
result = dns_db_getoriginnode(db, &node);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_db_findrdataset(db, node, version, dns_rdatatype_soa,
0, 0, &rdataset, NULL);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(&rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_current(&rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
ttl = ISC_MIN(rdataset.ttl, soa.minimum);
cleanup:
if (dns_rdataset_isassociated(&rdataset))
dns_rdataset_disassociate(&rdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
return (ttl);
}
static bool
dns64_aaaaok(ns_client_t *client, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_netaddr_t netaddr;
dns_dns64_t *dns64 = ISC_LIST_HEAD(client->view->dns64);
unsigned int flags = 0;
unsigned int i, count;
bool *aaaaok;
INSIST(client->query.dns64_aaaaok == NULL);
INSIST(client->query.dns64_aaaaoklen == 0);
INSIST(client->query.dns64_aaaa == NULL);
INSIST(client->query.dns64_sigaaaa == NULL);
if (dns64 == NULL)
return (true);
if (RECURSIONOK(client))
flags |= DNS_DNS64_RECURSIVE;
if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
flags |= DNS_DNS64_DNSSEC;
count = dns_rdataset_count(rdataset);
aaaaok = isc_mem_get(client->mctx, sizeof(bool) * count);
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
if (dns_dns64_aaaaok(dns64, &netaddr, client->signer,
&ns_g_server->aclenv, flags, rdataset,
aaaaok, count)) {
for (i = 0; i < count; i++) {
if (aaaaok != NULL && !aaaaok[i]) {
SAVE(client->query.dns64_aaaaok, aaaaok);
client->query.dns64_aaaaoklen = count;
break;
}
}
if (aaaaok != NULL)
isc_mem_put(client->mctx, aaaaok,
sizeof(bool) * count);
return (true);
}
if (aaaaok != NULL)
isc_mem_put(client->mctx, aaaaok,
sizeof(bool) * count);
return (false);
}
/*
* Look for the name and type in the redirection zone. If found update
* the arguments as appropriate. Return true if a update was
* performed.
*
* Only perform the update if the client is in the allow query acl and
* returning the update would not cause a DNSSEC validation failure.
*/
static isc_result_t
redirect(ns_client_t *client, dns_name_t *name, dns_rdataset_t *rdataset,
dns_dbnode_t **nodep, dns_db_t **dbp, dns_dbversion_t **versionp,
dns_rdatatype_t qtype)
{
dns_db_t *db = NULL;
dns_dbnode_t *node = NULL;
dns_fixedname_t fixed;
dns_name_t *found;
dns_rdataset_t trdataset;
isc_result_t result;
dns_rdatatype_t type;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
ns_dbversion_t *dbversion;
CTRACE(ISC_LOG_DEBUG(3), "redirect");
if (client->view->redirect == NULL)
return (ISC_R_NOTFOUND);
found = dns_fixedname_initname(&fixed);
dns_rdataset_init(&trdataset);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
if (WANTDNSSEC(client) && dns_db_iszone(*dbp) && dns_db_issecure(*dbp))
return (ISC_R_NOTFOUND);
if (WANTDNSSEC(client) && dns_rdataset_isassociated(rdataset)) {
if (rdataset->trust == dns_trust_secure)
return (ISC_R_NOTFOUND);
if (rdataset->trust == dns_trust_ultimate &&
(rdataset->type == dns_rdatatype_nsec ||
rdataset->type == dns_rdatatype_nsec3))
return (ISC_R_NOTFOUND);
if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_ncache_current(rdataset, found, &trdataset);
type = trdataset.type;
dns_rdataset_disassociate(&trdataset);
if (type == dns_rdatatype_nsec ||
type == dns_rdatatype_nsec3 ||
type == dns_rdatatype_rrsig)
return (ISC_R_NOTFOUND);
}
}
}
result = ns_client_checkaclsilent(client, NULL,
dns_zone_getqueryacl(client->view->redirect),
true);
if (result != ISC_R_SUCCESS)
return (ISC_R_NOTFOUND);
result = dns_zone_getdb(client->view->redirect, &db);
if (result != ISC_R_SUCCESS)
return (ISC_R_NOTFOUND);
dbversion = query_findversion(client, db);
if (dbversion == NULL) {
dns_db_detach(&db);
return (ISC_R_NOTFOUND);
}
/*
* Lookup the requested data in the redirect zone.
*/
result = dns_db_findext(db, client->query.qname, dbversion->version,
qtype, DNS_DBFIND_NOZONECUT, client->now,
&node, found, &cm, &ci, &trdataset, NULL);
if (result == DNS_R_NXRRSET || result == DNS_R_NCACHENXRRSET) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
goto nxrrset;
} else if (result != ISC_R_SUCCESS) {
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
return (ISC_R_NOTFOUND);
}
CTRACE(ISC_LOG_DEBUG(3), "redirect: found data: done");
dns_name_copy(found, name, NULL);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_clone(&trdataset, rdataset);
dns_rdataset_disassociate(&trdataset);
}
nxrrset:
if (*nodep != NULL)
dns_db_detachnode(*dbp, nodep);
dns_db_detach(dbp);
dns_db_attachnode(db, node, nodep);
dns_db_attach(db, dbp);
dns_db_detachnode(db, &node);
dns_db_detach(&db);
*versionp = dbversion->version;
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
return (result);
}
static isc_result_t
redirect2(ns_client_t *client, dns_name_t *name, dns_rdataset_t *rdataset,
dns_dbnode_t **nodep, dns_db_t **dbp, dns_dbversion_t **versionp,
dns_rdatatype_t qtype, bool *is_zonep)
{
dns_db_t *db = NULL;
dns_dbnode_t *node = NULL;
dns_fixedname_t fixed;
dns_fixedname_t fixedredirect;
dns_name_t *found, *redirectname;
dns_rdataset_t trdataset;
isc_result_t result;
dns_rdatatype_t type;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_dbversion_t *version = NULL;
dns_zone_t *zone = NULL;
bool is_zone;
unsigned int labels;
unsigned int options;
CTRACE(ISC_LOG_DEBUG(3), "redirect2");
if (client->view->redirectzone == NULL)
return (ISC_R_NOTFOUND);
if (dns_name_issubdomain(name, client->view->redirectzone))
return (ISC_R_NOTFOUND);
found = dns_fixedname_initname(&fixed);
dns_rdataset_init(&trdataset);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
if (WANTDNSSEC(client) && dns_db_iszone(*dbp) && dns_db_issecure(*dbp))
return (ISC_R_NOTFOUND);
if (WANTDNSSEC(client) && dns_rdataset_isassociated(rdataset)) {
if (rdataset->trust == dns_trust_secure)
return (ISC_R_NOTFOUND);
if (rdataset->trust == dns_trust_ultimate &&
(rdataset->type == dns_rdatatype_nsec ||
rdataset->type == dns_rdatatype_nsec3))
return (ISC_R_NOTFOUND);
if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
for (result = dns_rdataset_first(rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(rdataset)) {
dns_ncache_current(rdataset, found, &trdataset);
type = trdataset.type;
dns_rdataset_disassociate(&trdataset);
if (type == dns_rdatatype_nsec ||
type == dns_rdatatype_nsec3 ||
type == dns_rdatatype_rrsig)
return (ISC_R_NOTFOUND);
}
}
}
redirectname = dns_fixedname_initname(&fixedredirect);
labels = dns_name_countlabels(client->query.qname);
if (labels > 1U) {
dns_name_t prefix;
dns_name_init(&prefix, NULL);
dns_name_getlabelsequence(client->query.qname, 0, labels - 1,
&prefix);
result = dns_name_concatenate(&prefix,
client->view->redirectzone,
redirectname, NULL);
if (result != ISC_R_SUCCESS)
return (ISC_R_NOTFOUND);
} else
dns_name_copy(redirectname, client->view->redirectzone, NULL);
options = 0;
result = query_getdb(client, redirectname, qtype, options, &zone,
&db, &version, &is_zone);
if (result != ISC_R_SUCCESS)
return (ISC_R_NOTFOUND);
if (zone != NULL)
dns_zone_detach(&zone);
/*
* Lookup the requested data in the redirect zone.
*/
result = dns_db_findext(db, redirectname, version,
qtype, 0, client->now,
&node, found, &cm, &ci, &trdataset, NULL);
if (result == DNS_R_NXRRSET || result == DNS_R_NCACHENXRRSET) {
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
goto nxrrset;
} else if (result == ISC_R_NOTFOUND || result == DNS_R_DELEGATION) {
/*
* Cleanup.
*/
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
/*
* Don't loop forever if the lookup failed last time.
*/
if (!REDIRECT(client)) {
result = query_recurse(client, qtype, redirectname,
NULL, NULL, true);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
client->query.attributes |=
NS_QUERYATTR_REDIRECT;
return (DNS_R_CONTINUE);
}
}
return (ISC_R_NOTFOUND);
} else if (result != ISC_R_SUCCESS) {
if (dns_rdataset_isassociated(&trdataset))
dns_rdataset_disassociate(&trdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
dns_db_detach(&db);
return (ISC_R_NOTFOUND);
}
CTRACE(ISC_LOG_DEBUG(3), "redirect2: found data: done");
/*
* Adjust the found name to not include the redirectzone suffix.
*/
dns_name_split(found, dns_name_countlabels(client->view->redirectzone),
found, NULL);
/*
* Make the name absolute.
*/
result = dns_name_concatenate(found, dns_rootname, found, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_name_copy(found, name, NULL);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(&trdataset)) {
dns_rdataset_clone(&trdataset, rdataset);
dns_rdataset_disassociate(&trdataset);
}
nxrrset:
if (*nodep != NULL)
dns_db_detachnode(*dbp, nodep);
dns_db_detach(dbp);
dns_db_attachnode(db, node, nodep);
dns_db_attach(db, dbp);
dns_db_detachnode(db, &node);
dns_db_detach(&db);
*is_zonep = is_zone;
*versionp = version;
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
return (result);
}
/*
* Do the bulk of query processing for the current query of 'client'.
* If 'event' is non-NULL, we are returning from recursion and 'qtype'
* is ignored. Otherwise, 'qtype' is the query type.
*/
static isc_result_t
query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype)
{
dns_db_t *db, *zdb;
dns_dbnode_t *node;
dns_rdatatype_t type = qtype;
dns_name_t *fname, *zfname, *tname, *prefix;
dns_rdataset_t *rdataset, *trdataset;
dns_rdataset_t *sigrdataset, *zrdataset, *zsigrdataset;
dns_rdataset_t **sigrdatasetp;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdatasetiter_t *rdsiter;
bool want_restart, is_zone, need_wildcardproof;
bool is_staticstub_zone;
bool authoritative = false;
bool answer_has_ns = false;
unsigned int n, nlabels;
dns_namereln_t namereln;
int order;
isc_buffer_t *dbuf;
isc_buffer_t b;
isc_result_t result, eresult, tresult;
dns_fixedname_t fixed;
dns_fixedname_t wildcardname;
dns_dbversion_t *version, *zversion;
dns_zone_t *zone;
dns_rdata_cname_t cname;
dns_rdata_dname_t dname;
unsigned int options;
bool empty_wild;
dns_rdataset_t *noqname;
dns_rpz_st_t *rpz_st;
bool resuming;
int line = -1;
bool dns64_exclude, dns64, rpz;
bool nxrewrite = false;
bool redirected = false;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
char errmsg[256];
bool associated;
dns_section_t section;
dns_ttl_t ttl;
bool failcache;
uint32_t flags;
#ifdef WANT_QUERYTRACE
char mbuf[4 * DNS_NAME_FORMATSIZE];
char qbuf[DNS_NAME_FORMATSIZE];
char tbuf[DNS_RDATATYPE_FORMATSIZE];
#endif
dns_name_t *rpzqname;
CTRACE(ISC_LOG_DEBUG(3), "query_find");
/*
* One-time initialization.
*
* It's especially important to initialize anything that the cleanup
* code might cleanup.
*/
eresult = ISC_R_SUCCESS;
fname = NULL;
zfname = NULL;
rdataset = NULL;
zrdataset = NULL;
sigrdataset = NULL;
zsigrdataset = NULL;
zversion = NULL;
node = NULL;
db = NULL;
zdb = NULL;
version = NULL;
zone = NULL;
need_wildcardproof = false;
empty_wild = false;
dns64_exclude = dns64 = rpz = false;
options = 0;
resuming = false;
is_zone = false;
is_staticstub_zone = false;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
#ifdef WANT_QUERYTRACE
if (client->query.origqname != NULL)
dns_name_format(client->query.origqname, qbuf,
sizeof(qbuf));
else
snprintf(qbuf, sizeof(qbuf), "<unset>");
snprintf(mbuf, sizeof(mbuf) - 1,
"client attr:0x%x, query attr:0x%X, restarts:%u, "
"origqname:%s, timer:%d, authdb:%d, referral:%d",
client->attributes,
client->query.attributes,
client->query.restarts, qbuf,
(int) client->query.timerset,
(int) client->query.authdbset,
(int) client->query.isreferral);
CTRACE(ISC_LOG_DEBUG(3), mbuf);
#endif
if (event != NULL) {
/*
* We're returning from recursion. Restore the query context
* and resume.
*/
want_restart = false;
rpz_st = client->query.rpz_st;
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0)
{
CTRACE(ISC_LOG_DEBUG(3), "resume from RPZ recursion");
#ifdef WANT_QUERYTRACE
{
char pbuf[DNS_NAME_FORMATSIZE] = "<unset>";
char fbuf[DNS_NAME_FORMATSIZE] = "<unset>";
if (rpz_st->r_name != NULL)
dns_name_format(rpz_st->r_name,
qbuf, sizeof(qbuf));
else
snprintf(qbuf, sizeof(qbuf),
"<unset>");
if (rpz_st->p_name != NULL)
dns_name_format(rpz_st->p_name,
pbuf, sizeof(pbuf));
if (rpz_st->fname != NULL)
dns_name_format(rpz_st->fname,
fbuf, sizeof(fbuf));
snprintf(mbuf, sizeof(mbuf) - 1,
"rpz rname:%s, pname:%s, fname:%s",
qbuf, pbuf, fbuf);
CTRACE(ISC_LOG_DEBUG(3), mbuf);
}
#endif
is_zone = rpz_st->q.is_zone;
authoritative = rpz_st->q.authoritative;
RESTORE(zone, rpz_st->q.zone);
RESTORE(node, rpz_st->q.node);
RESTORE(db, rpz_st->q.db);
RESTORE(rdataset, rpz_st->q.rdataset);
RESTORE(sigrdataset, rpz_st->q.sigrdataset);
qtype = rpz_st->q.qtype;
if (event->node != NULL)
dns_db_detachnode(event->db, &event->node);
SAVE(rpz_st->r.db, event->db);
rpz_st->r.r_type = event->qtype;
SAVE(rpz_st->r.r_rdataset, event->rdataset);
query_putrdataset(client, &event->sigrdataset);
} else if (REDIRECT(client)) {
/*
* Restore saved state.
*/
CTRACE(ISC_LOG_DEBUG(3),
"resume from redirect recursion");
#ifdef WANT_QUERYTRACE
dns_name_format(client->query.redirect.fname,
qbuf, sizeof(qbuf));
dns_rdatatype_format(client->query.redirect.qtype,
tbuf, sizeof(tbuf));
snprintf(mbuf, sizeof(mbuf) - 1,
"redirect fname:%s, qtype:%s, auth:%d",
qbuf, tbuf,
client->query.redirect.authoritative);
CTRACE(ISC_LOG_DEBUG(3), mbuf);
#endif
qtype = client->query.redirect.qtype;
INSIST(client->query.redirect.rdataset != NULL);
RESTORE(rdataset, client->query.redirect.rdataset);
RESTORE(sigrdataset,
client->query.redirect.sigrdataset);
RESTORE(db, client->query.redirect.db);
RESTORE(node, client->query.redirect.node);
RESTORE(zone, client->query.redirect.zone);
authoritative = client->query.redirect.authoritative;
is_zone = client->query.redirect.is_zone;
/*
* Free resources used while recursing.
*/
query_putrdataset(client, &event->rdataset);
query_putrdataset(client, &event->sigrdataset);
if (event->node != NULL)
dns_db_detachnode(event->db, &event->node);
if (event->db != NULL)
dns_db_detach(&event->db);
} else {
CTRACE(ISC_LOG_DEBUG(3),
"resume from normal recursion");
authoritative = false;
qtype = event->qtype;
SAVE(db, event->db);
SAVE(node, event->node);
SAVE(rdataset, event->rdataset);
SAVE(sigrdataset, event->sigrdataset);
}
INSIST(rdataset != NULL);
if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
type = dns_rdatatype_any;
else
type = qtype;
if (DNS64(client)) {
client->query.attributes &= ~NS_QUERYATTR_DNS64;
dns64 = true;
}
if (DNS64EXCLUDE(client)) {
client->query.attributes &= ~NS_QUERYATTR_DNS64EXCLUDE;
dns64_exclude = true;
}
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0)
{
/*
* Has response policy changed out from under us?
*/
if (rpz_st->rpz_ver != client->view->rpzs->rpz_ver) {
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
DNS_RPZ_INFO_LEVEL,
"query_find: RPZ settings "
"out of date "
"(rpz_ver %d, expected %d)",
client->view->rpzs->rpz_ver,
rpz_st->rpz_ver);
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: query_getnamebuf failed (1)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: query_newname failed (1)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0) {
tname = rpz_st->fname;
} else if (REDIRECT(client)) {
tname = client->query.redirect.fname;
} else {
tname = dns_fixedname_name(&event->foundname);
}
result = dns_name_copy(tname, fname, NULL);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_ERROR,
"query_find: dns_name_copy failed");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (rpz_st != NULL &&
(rpz_st->state & DNS_RPZ_RECURSING) != 0) {
rpz_st->r.r_result = event->result;
result = rpz_st->q.result;
free_devent(client, ISC_EVENT_PTR(&event), &event);
} else if (REDIRECT(client)) {
result = client->query.redirect.result;
is_zone = client->query.redirect.is_zone;
} else {
result = event->result;
}
resuming = true;
goto resume;
}
/*
* Not returning from recursion.
*
* First, check for a recent match in the view's SERVFAIL cache.
* If we find one, and it was from a query with CD=1, *or*
* if the current query has CD=0, then we can just return
* SERVFAIL now.
*/
if (RECURSIONOK(client)) {
flags = 0;
#ifdef ENABLE_AFL
if (ns_g_fuzz_type == ns_fuzz_resolver) {
failcache = false;
} else {
failcache = dns_badcache_find(client->view->failcache,
client->query.qname, qtype,
&flags, &client->tnow);
}
#else
failcache = dns_badcache_find(client->view->failcache,
client->query.qname, qtype,
&flags, &client->tnow);
#endif
if (failcache &&
(((flags & NS_FAILCACHE_CD) != 0) ||
((client->message->flags & DNS_MESSAGEFLAG_CD) == 0)))
{
if (isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(1))) {
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
dns_name_format(client->query.qname,
namebuf, sizeof(namebuf));
dns_rdatatype_format(qtype, typebuf,
sizeof(typebuf));
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(1),
"servfail cache hit %s/%s (%s)",
namebuf, typebuf,
((flags & NS_FAILCACHE_CD) != 0)
? "CD=1"
: "CD=0");
}
client->attributes |= NS_CLIENTATTR_NOSETFC;
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* If it's a SIG query, we'll iterate the node.
*/
if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
type = dns_rdatatype_any;
else
type = qtype;
restart:
CTRACE(ISC_LOG_DEBUG(3), "query_find: restart");
want_restart = false;
authoritative = false;
version = NULL;
zversion = NULL;
need_wildcardproof = false;
rpz = false;
/*
* If we require a server cookie then send back BADCOOKIE
* before we have done too much work.
*/
if (!TCP(client) && client->view->requireservercookie &&
WANTCOOKIE(client) && !HAVECOOKIE(client))
{
client->message->flags &= ~DNS_MESSAGEFLAG_AA;
client->message->flags &= ~DNS_MESSAGEFLAG_AD;
client->message->rcode = dns_rcode_badcookie;
goto cleanup;
}
if (client->view->checknames &&
!dns_rdata_checkowner(client->query.qname,
client->message->rdclass,
qtype, false)) {
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
dns_rdatatype_format(qtype, typebuf, sizeof(typebuf));
dns_rdataclass_format(client->message->rdclass, classbuf,
sizeof(classbuf));
ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_ERROR,
"check-names failure %s/%s/%s", namebuf,
typebuf, classbuf);
QUERY_ERROR(DNS_R_REFUSED);
goto cleanup;
}
/*
* Setup for root key sentinel processing.
*/
if (client->view->root_key_sentinel &&
client->query.restarts == 0 &&
(qtype == dns_rdatatype_a ||
qtype == dns_rdatatype_aaaa) &&
(client->message->flags & DNS_MESSAGEFLAG_CD) == 0)
{
root_key_sentinel_detect(client);
}
/*
* First we must find the right database.
*/
options &= DNS_GETDB_NOLOG; /* Preserve DNS_GETDB_NOLOG. */
if (dns_rdatatype_atparent(qtype) &&
!dns_name_equal(client->query.qname, dns_rootname))
options |= DNS_GETDB_NOEXACT;
result = query_getdb(client, client->query.qname, qtype, options,
&zone, &db, &version, &is_zone);
if (ISC_UNLIKELY((result != ISC_R_SUCCESS || !is_zone) &&
qtype == dns_rdatatype_ds &&
!RECURSIONOK(client) &&
(options & DNS_GETDB_NOEXACT) != 0))
{
/*
* If the query type is DS, look to see if we are
* authoritative for the child zone.
*/
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
tresult = query_getzonedb(client, client->query.qname, qtype,
DNS_GETDB_PARTIAL, &tzone, &tdb,
&tversion);
if (tresult == ISC_R_SUCCESS) {
options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(client, &rdataset);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
version = NULL;
RESTORE(version, tversion);
RESTORE(db, tdb);
RESTORE(zone, tzone);
is_zone = true;
result = ISC_R_SUCCESS;
} else {
if (tdb != NULL)
dns_db_detach(&tdb);
if (tzone != NULL)
dns_zone_detach(&tzone);
}
}
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_REFUSED) {
if (WANTRECURSION(client)) {
inc_stats(client,
dns_nsstatscounter_recurserej);
} else
inc_stats(client, dns_nsstatscounter_authrej);
if (!PARTIALANSWER(client))
QUERY_ERROR(DNS_R_REFUSED);
} else {
CTRACE(ISC_LOG_ERROR,
"query_find: query_getdb failed");
QUERY_ERROR(DNS_R_SERVFAIL);
}
goto cleanup;
}
is_staticstub_zone = false;
if (is_zone) {
authoritative = true;
if (zone != NULL &&
dns_zone_gettype(zone) == dns_zone_staticstub)
is_staticstub_zone = true;
}
if (event == NULL && client->query.restarts == 0) {
if (is_zone) {
if (zone != NULL) {
/*
* if is_zone = true, zone = NULL then this is
* a DLZ zone. Don't attempt to attach zone.
*/
dns_zone_attach(zone, &client->query.authzone);
}
dns_db_attach(db, &client->query.authdb);
}
client->query.authdbset = true;
/* Track TCP vs UDP stats per zone */
if (TCP(client))
inc_stats(client, dns_nsstatscounter_tcp);
else
inc_stats(client, dns_nsstatscounter_udp);
}
db_find:
CTRACE(ISC_LOG_DEBUG(3), "query_find: db_find");
/*
* We'll need some resources...
*/
dbuf = query_getnamebuf(client);
if (ISC_UNLIKELY(dbuf == NULL)) {
CTRACE(ISC_LOG_ERROR,
"query_find: query_getnamebuf failed (2)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
rdataset = query_newrdataset(client);
if (ISC_UNLIKELY(fname == NULL || rdataset == NULL)) {
CTRACE(ISC_LOG_ERROR,
"query_find: query_newname failed (2)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (WANTDNSSEC(client) && (!is_zone || dns_db_issecure(db))) {
sigrdataset = query_newrdataset(client);
if (sigrdataset == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: query_newrdataset failed (2)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* Now look for an answer in the database. If this is a dns64
* AAAA lookup on a rpz database adjust the qname.
*/
if (dns64 && rpz)
rpzqname = client->query.rpz_st->p_name;
else
rpzqname = client->query.qname;
result = dns_db_findext(db, rpzqname, version, type,
client->query.dboptions, client->now,
&node, fname, &cm, &ci, rdataset, sigrdataset);
/*
* Fixup fname and sigrdataset.
*/
if (dns64 && rpz) {
isc_result_t rresult;
rresult = dns_name_copy(client->query.qname, fname, NULL);
RUNTIME_CHECK(rresult == ISC_R_SUCCESS);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
}
if (!is_zone)
dns_cache_updatestats(client->view->cache, result);
resume:
CTRACE(ISC_LOG_DEBUG(3), "query_find: resume");
/*
* Rate limit these responses to this client.
* Do not delay counting and handling obvious referrals,
* since those won't come here again.
* Delay handling delegations for which we are certain to recurse and
* return here (DNS_R_DELEGATION, not a child of one of our
* own zones, and recursion enabled)
* Don't mess with responses rewritten by RPZ
* Count each response at most once.
*/
if (client->view->rrl != NULL && !HAVECOOKIE(client) &&
((fname != NULL && dns_name_isabsolute(fname)) ||
(result == ISC_R_NOTFOUND && !RECURSIONOK(client))) &&
!(result == DNS_R_DELEGATION && !is_zone && RECURSIONOK(client)) &&
(client->query.rpz_st == NULL ||
(client->query.rpz_st->state & DNS_RPZ_REWRITTEN) == 0)&&
(client->query.attributes & NS_QUERYATTR_RRL_CHECKED) == 0)
{
dns_rdataset_t nc_rdataset;
bool wouldlog;
char log_buf[DNS_RRL_LOG_BUF_LEN];
isc_result_t nc_result, resp_result;
dns_rrl_result_t rrl_result;
client->query.attributes |= NS_QUERYATTR_RRL_CHECKED;
wouldlog = isc_log_wouldlog(ns_g_lctx, DNS_RRL_LOG_DROP);
tname = fname;
if (result == DNS_R_NXDOMAIN) {
/*
* Use the database origin name to rate limit NXDOMAIN
*/
if (db != NULL)
tname = dns_db_origin(db);
resp_result = result;
} else if (result == DNS_R_NCACHENXDOMAIN &&
rdataset != NULL &&
dns_rdataset_isassociated(rdataset) &&
(rdataset->attributes &
DNS_RDATASETATTR_NEGATIVE) != 0) {
/*
* Try to use owner name in the negative cache SOA.
*/
dns_fixedname_init(&fixed);
dns_rdataset_init(&nc_rdataset);
for (nc_result = dns_rdataset_first(rdataset);
nc_result == ISC_R_SUCCESS;
nc_result = dns_rdataset_next(rdataset)) {
dns_ncache_current(rdataset,
dns_fixedname_name(&fixed),
&nc_rdataset);
if (nc_rdataset.type == dns_rdatatype_soa) {
dns_rdataset_disassociate(&nc_rdataset);
tname = dns_fixedname_name(&fixed);
break;
}
dns_rdataset_disassociate(&nc_rdataset);
}
resp_result = DNS_R_NXDOMAIN;
} else if (result == DNS_R_NXRRSET ||
result == DNS_R_EMPTYNAME) {
resp_result = DNS_R_NXRRSET;
} else if (result == DNS_R_DELEGATION) {
resp_result = result;
} else if (result == ISC_R_NOTFOUND) {
/*
* Handle referral to ".", including when recursion
* is off or not requested and the hints have not
* been loaded or we have "additional-from-cache no".
*/
tname = dns_rootname;
resp_result = DNS_R_DELEGATION;
} else {
resp_result = ISC_R_SUCCESS;
}
rrl_result = dns_rrl(client->view, &client->peeraddr,
TCP(client), client->message->rdclass,
qtype, tname, resp_result, client->now,
wouldlog, log_buf, sizeof(log_buf));
if (rrl_result != DNS_RRL_RESULT_OK) {
/*
* Log dropped or slipped responses in the query
* category so that requests are not silently lost.
* Starts of rate-limited bursts are logged in
* DNS_LOGCATEGORY_RRL.
*
* Dropped responses are counted with dropped queries
* in QryDropped while slipped responses are counted
* with other truncated responses in RespTruncated.
*/
if (wouldlog) {
ns_client_log(client, DNS_LOGCATEGORY_RRL,
NS_LOGMODULE_QUERY,
DNS_RRL_LOG_DROP,
"%s", log_buf);
}
if (!client->view->rrl->log_only) {
if (rrl_result == DNS_RRL_RESULT_DROP) {
/*
* These will also be counted in
* dns_nsstatscounter_dropped
*/
inc_stats(client,
dns_nsstatscounter_ratedropped);
QUERY_ERROR(DNS_R_DROP);
} else {
/*
* These will also be counted in
* dns_nsstatscounter_truncatedresp
*/
inc_stats(client,
dns_nsstatscounter_rateslipped);
if (WANTCOOKIE(client)) {
client->message->flags &=
~DNS_MESSAGEFLAG_AA;
client->message->flags &=
~DNS_MESSAGEFLAG_AD;
client->message->rcode =
dns_rcode_badcookie;
} else {
client->message->flags |=
DNS_MESSAGEFLAG_TC;
if (resp_result ==
DNS_R_NXDOMAIN)
client->message->rcode =
dns_rcode_nxdomain;
}
}
goto cleanup;
}
}
} else if (!TCP(client) && client->view->requireservercookie &&
WANTCOOKIE(client) && !HAVECOOKIE(client)) {
client->message->flags &= ~DNS_MESSAGEFLAG_AA;
client->message->flags &= ~DNS_MESSAGEFLAG_AD;
client->message->rcode = dns_rcode_badcookie;
goto cleanup;
}
if (!RECURSING(client) &&
!dns_name_equal(client->query.qname, dns_rootname))
{
isc_result_t rresult;
rresult = rpz_rewrite(client, qtype, result, resuming,
rdataset, sigrdataset);
rpz_st = client->query.rpz_st;
switch (rresult) {
case ISC_R_SUCCESS:
break;
case DNS_R_DISALLOWED:
goto norpz;
case DNS_R_DELEGATION:
/*
* recursing for NS names or addresses,
* so save the main query state
*/
rpz_st->q.qtype = qtype;
rpz_st->q.is_zone = is_zone;
rpz_st->q.authoritative = authoritative;
SAVE(rpz_st->q.zone, zone);
SAVE(rpz_st->q.db, db);
SAVE(rpz_st->q.node, node);
SAVE(rpz_st->q.rdataset, rdataset);
SAVE(rpz_st->q.sigrdataset, sigrdataset);
dns_name_copy(fname, rpz_st->fname, NULL);
rpz_st->q.result = result;
client->query.attributes |= NS_QUERYATTR_RECURSING;
goto cleanup;
default:
RECURSE_ERROR(rresult);
goto cleanup;
}
if (rpz_st->m.policy != DNS_RPZ_POLICY_MISS)
rpz_st->state |= DNS_RPZ_REWRITTEN;
if (rpz_st->m.policy != DNS_RPZ_POLICY_MISS &&
rpz_st->m.policy != DNS_RPZ_POLICY_PASSTHRU &&
(rpz_st->m.policy != DNS_RPZ_POLICY_TCP_ONLY ||
!TCP(client)) &&
rpz_st->m.policy != DNS_RPZ_POLICY_ERROR)
{
/*
* We got a hit and are going to answer with our
* fiction. Ensure that we answer with the name
* we looked up even if we were stopped short
* in recursion or for a deferral.
*/
rresult = dns_name_copy(client->query.qname,
fname, NULL);
RUNTIME_CHECK(rresult == ISC_R_SUCCESS);
rpz_clean(&zone, &db, &node, NULL);
if (rpz_st->m.rdataset != NULL) {
query_putrdataset(client, &rdataset);
RESTORE(rdataset, rpz_st->m.rdataset);
} else if (rdataset != NULL &&
dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
version = NULL;
RESTORE(node, rpz_st->m.node);
RESTORE(db, rpz_st->m.db);
RESTORE(version, rpz_st->m.version);
RESTORE(zone, rpz_st->m.zone);
switch (rpz_st->m.policy) {
case DNS_RPZ_POLICY_TCP_ONLY:
client->message->flags |= DNS_MESSAGEFLAG_TC;
if (result == DNS_R_NXDOMAIN ||
result == DNS_R_NCACHENXDOMAIN)
client->message->rcode =
dns_rcode_nxdomain;
rpz_log_rewrite(client, false,
rpz_st->m.policy,
rpz_st->m.type, zone,
rpz_st->p_name, NULL,
rpz_st->m.rpz->num);
goto cleanup;
case DNS_RPZ_POLICY_DROP:
QUERY_ERROR(DNS_R_DROP);
rpz_log_rewrite(client, false,
rpz_st->m.policy,
rpz_st->m.type, zone,
rpz_st->p_name, NULL,
rpz_st->m.rpz->num);
goto cleanup;
case DNS_RPZ_POLICY_NXDOMAIN:
result = DNS_R_NXDOMAIN;
nxrewrite = true;
rpz = true;
break;
case DNS_RPZ_POLICY_NODATA:
nxrewrite = true;
/* FALLTHROUGH */
case DNS_RPZ_POLICY_DNS64:
result = DNS_R_NXRRSET;
rpz = true;
break;
case DNS_RPZ_POLICY_RECORD:
result = rpz_st->m.result;
if (qtype == dns_rdatatype_any &&
result != DNS_R_CNAME) {
/*
* We will add all of the rdatasets of
* the node by iterating later,
* and set the TTL then.
*/
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
} else {
/*
* We will add this rdataset.
*/
rdataset->ttl = ISC_MIN(rdataset->ttl,
rpz_st->m.ttl);
}
rpz = true;
break;
case DNS_RPZ_POLICY_WILDCNAME:
result = dns_rdataset_first(rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname,
NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&rdata);
result = rpz_add_cname(client, rpz_st,
&cname.cname,
fname, dbuf);
if (result != ISC_R_SUCCESS)
goto cleanup;
fname = NULL;
want_restart = true;
goto cleanup;
case DNS_RPZ_POLICY_CNAME:
/*
* Add overriding CNAME from a named.conf
* response-policy statement
*/
result = rpz_add_cname(client, rpz_st,
&rpz_st->m.rpz->cname,
fname, dbuf);
if (result != ISC_R_SUCCESS)
goto cleanup;
fname = NULL;
want_restart = true;
goto cleanup;
default:
INSIST(0);
}
/*
* Turn off DNSSEC because the results of a
* response policy zone cannot verify.
*/
client->attributes &= ~(NS_CLIENTATTR_WANTDNSSEC |
NS_CLIENTATTR_WANTAD);
client->message->flags &= ~DNS_MESSAGEFLAG_AD;
query_putrdataset(client, &sigrdataset);
is_zone = true;
rpz_log_rewrite(client, false, rpz_st->m.policy,
rpz_st->m.type, zone, rpz_st->p_name,
NULL, rpz_st->m.rpz->num);
}
}
norpz:
/*
* If required, handle special "root-key-sentinel-is-ta-<keyid>" and
* "root-key-sentinel-not-ta-<keyid>" labels by returning SERVFAIL.
*/
if (root_key_sentinel_return_servfail(client, is_zone,
rdataset, result))
{
/*
* Don't record this response in the SERVFAIL cache.
*/
client->attributes |= NS_CLIENTATTR_NOSETFC;
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
switch (result) {
case ISC_R_SUCCESS:
/*
* This case is handled in the main line below.
*/
break;
case DNS_R_GLUE:
case DNS_R_ZONECUT:
/*
* These cases are handled in the main line below.
*/
INSIST(is_zone);
authoritative = false;
break;
case ISC_R_NOTFOUND:
/*
* The cache doesn't even have the root NS. Get them from
* the hints DB.
*/
INSIST(!is_zone);
if (db != NULL)
dns_db_detach(&db);
if (client->view->hints == NULL) {
/* We have no hints. */
result = ISC_R_FAILURE;
} else {
dns_db_attach(client->view->hints, &db);
result = dns_db_findext(db, dns_rootname,
NULL, dns_rdatatype_ns,
0, client->now, &node,
fname, &cm, &ci,
rdataset, sigrdataset);
}
if (result != ISC_R_SUCCESS) {
/*
* Nonsensical root hints may require cleanup.
*/
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
/*
* We don't have any root server hints, but
* we may have working forwarders, so try to
* recurse anyway.
*/
if (RECURSIONOK(client)) {
INSIST(!REDIRECT(client));
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else
RECURSE_ERROR(result);
goto cleanup;
} else {
/* Unable to give root server referral. */
CTRACE(ISC_LOG_ERROR,
"unable to give root server referral");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
/*
* XXXRTH We should trigger root server priming here.
*/
/* FALLTHROUGH */
case DNS_R_DELEGATION:
authoritative = false;
if (is_zone) {
/*
* Look to see if we are authoritative for the
* child zone if the query type is DS.
*/
if (!RECURSIONOK(client) &&
(options & DNS_GETDB_NOEXACT) != 0 &&
qtype == dns_rdatatype_ds) {
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
result = query_getzonedb(client,
client->query.qname,
qtype,
DNS_GETDB_PARTIAL,
&tzone, &tdb,
&tversion);
if (result == ISC_R_SUCCESS) {
options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client,
&sigrdataset);
if (fname != NULL)
query_releasename(client,
&fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
version = NULL;
RESTORE(version, tversion);
RESTORE(db, tdb);
RESTORE(zone, tzone);
authoritative = true;
goto db_find;
}
if (tdb != NULL)
dns_db_detach(&tdb);
if (tzone != NULL)
dns_zone_detach(&tzone);
}
/*
* We're authoritative for an ancestor of QNAME.
*/
if (!USECACHE(client) || !RECURSIONOK(client)) {
bool detach = false;
dns_fixedname_init(&fixed);
dns_name_copy(fname,
dns_fixedname_name(&fixed), NULL);
/*
* If we don't have a cache, this is the best
* answer.
*
* If the client is making a nonrecursive
* query we always give out the authoritative
* delegation. This way even if we get
* junk in our cache, we won't fail in our
* role as the delegating authority if another
* nameserver asks us about a delegated
* subzone.
*
* We enable the retrieval of glue for this
* database by setting client->query.gluedb.
*/
if (db != NULL &&
client->query.gluedb == NULL) {
dns_db_attach(db,
&client->query.gluedb);
detach = true;
}
client->query.isreferral = true;
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &fname,
&rdataset, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
if (detach) {
dns_db_detach(&client->query.gluedb);
}
if (WANTDNSSEC(client))
query_addds(client, db, node, version,
dns_fixedname_name(&fixed));
} else {
/*
* We might have a better answer or delegation
* in the cache. We'll remember the current
* values of fname, rdataset, and sigrdataset.
* We'll then go looking for QNAME in the
* cache. If we find something better, we'll
* use it instead.
*/
query_keepname(client, fname, dbuf);
dns_db_detachnode(db, &node);
SAVE(zdb, db);
SAVE(zfname, fname);
SAVE(zversion, version);
SAVE(zrdataset, rdataset);
SAVE(zsigrdataset, sigrdataset);
dns_db_attach(client->view->cachedb, &db);
is_zone = false;
goto db_find;
}
} else {
if (zfname != NULL &&
(!dns_name_issubdomain(fname, zfname) ||
(is_staticstub_zone &&
dns_name_equal(fname, zfname)))) {
/*
* In the following cases use "authoritative"
* data instead of the cache delegation:
* 1. We've already got a delegation from
* authoritative data, and it is better
* than what we found in the cache.
* 2. The query name matches the origin name
* of a static-stub zone. This needs to be
* considered for the case where the NS of
* the static-stub zone and the cached NS
* are different. We still need to contact
* the nameservers configured in the
* static-stub zone.
*/
query_releasename(client, &fname);
/*
* We've already done query_keepname() on
* zfname, so we must set dbuf to NULL to
* prevent query_addrrset() from trying to
* call query_keepname() again.
*/
dbuf = NULL;
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client,
&sigrdataset);
version = NULL;
RESTORE(fname, zfname);
RESTORE(version, zversion);
RESTORE(rdataset, zrdataset);
RESTORE(sigrdataset, zsigrdataset);
/*
* We don't clean up zdb here because we
* may still need it. It will get cleaned
* up by the main cleanup code.
*/
}
if (RECURSIONOK(client)) {
/*
* Recurse!
*/
INSIST(!REDIRECT(client));
if (dns_rdatatype_atparent(type))
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
else if (dns64)
result = query_recurse(client,
dns_rdatatype_a,
client->query.qname,
NULL, NULL, resuming);
else
result = query_recurse(client, qtype,
client->query.qname,
fname, rdataset,
resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else if (result == DNS_R_DUPLICATE ||
result == DNS_R_DROP)
QUERY_ERROR(result);
else
RECURSE_ERROR(result);
} else {
bool detach = false;
dns_fixedname_init(&fixed);
dns_name_copy(fname,
dns_fixedname_name(&fixed), NULL);
/*
* This is the best answer.
*/
client->query.attributes |=
NS_QUERYATTR_CACHEGLUEOK;
client->query.isreferral = true;
if (zdb != NULL &&
client->query.gluedb == NULL) {
dns_db_attach(zdb,
&client->query.gluedb);
detach = true;
}
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
query_addrrset(client, &fname,
&rdataset, sigrdatasetp,
dbuf, DNS_SECTION_AUTHORITY);
client->query.attributes &=
~NS_QUERYATTR_CACHEGLUEOK;
if (detach) {
dns_db_detach(&client->query.gluedb);
}
if (WANTDNSSEC(client))
query_addds(client, db, node, version,
dns_fixedname_name(&fixed));
}
}
goto cleanup;
case DNS_R_EMPTYNAME:
case DNS_R_NXRRSET:
iszone_nxrrset:
INSIST(is_zone);
#ifdef dns64_bis_return_excluded_addresses
if (dns64)
#else
if (dns64 && !dns64_exclude)
#endif
{
/*
* Restore the answers from the previous AAAA lookup.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
RESTORE(rdataset, client->query.dns64_aaaa);
RESTORE(sigrdataset, client->query.dns64_sigaaaa);
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: "
"query_getnamebuf failed (3)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: "
"query_newname failed (3)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
dns_name_copy(client->query.qname, fname, NULL);
dns64 = false;
#ifdef dns64_bis_return_excluded_addresses
/*
* Resume the diverted processing of the AAAA response?
*/
if (dns64_excluded)
break;
#endif
} else if (result == DNS_R_NXRRSET &&
!ISC_LIST_EMPTY(client->view->dns64) &&
!nxrewrite &&
client->message->rdclass == dns_rdataclass_in &&
qtype == dns_rdatatype_aaaa)
{
/*
* Look to see if there are A records for this
* name.
*/
SAVE(client->query.dns64_aaaa, rdataset);
SAVE(client->query.dns64_sigaaaa, sigrdataset);
client->query.dns64_ttl = dns64_ttl(db, version);
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
type = qtype = dns_rdatatype_a;
dns64 = true;
goto db_find;
}
/*
* Look for a NSEC3 record if we don't have a NSEC record.
*/
nxrrset_rrsig:
if (redirected)
goto cleanup;
if (!dns_rdataset_isassociated(rdataset) &&
WANTDNSSEC(client)) {
if ((fname->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
dns_name_t *found;
dns_name_t *qname;
found = dns_fixedname_initname(&fixed);
qname = client->query.qname;
query_findclosestnsec3(qname, db, version,
client, rdataset,
sigrdataset, fname,
true, found);
/*
* Did we find the closest provable encloser
* instead? If so add the nearest to the
* closest provable encloser.
*/
if (dns_rdataset_isassociated(rdataset) &&
!dns_name_equal(qname, found) &&
!(ns_g_nonearest &&
qtype != dns_rdatatype_ds))
{
unsigned int count;
unsigned int skip;
/*
* Add the closest provable encloser.
*/
query_addrrset(client, &fname,
&rdataset, &sigrdataset,
dbuf,
DNS_SECTION_AUTHORITY);
count = dns_name_countlabels(found)
+ 1;
skip = dns_name_countlabels(qname) -
count;
dns_name_getlabelsequence(qname, skip,
count,
found);
fixfname(client, &fname, &dbuf, &b);
fixrdataset(client, &rdataset);
fixrdataset(client, &sigrdataset);
if (fname == NULL ||
rdataset == NULL ||
sigrdataset == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: "
"failure getting "
"closest encloser");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
/*
* 'nearest' doesn't exist so
* 'exist' is set to false.
*/
query_findclosestnsec3(found, db,
version,
client,
rdataset,
sigrdataset,
fname,
false,
NULL);
}
} else {
query_releasename(client, &fname);
query_addwildcardproof(client, db, version,
client->query.qname,
false, true);
}
}
if (dns_rdataset_isassociated(rdataset)) {
/*
* If we've got a NSEC record, we need to save the
* name now because we're going call query_addsoa()
* below, and it needs to use the name buffer.
*/
query_keepname(client, fname, dbuf);
} else if (fname != NULL) {
/*
* We're not going to use fname, and need to release
* our hold on the name buffer so query_addsoa()
* may use it.
*/
query_releasename(client, &fname);
}
/*
* Add SOA to the additional section if generated by a RPZ
* rewrite.
*/
associated = dns_rdataset_isassociated(rdataset);
section = nxrewrite ? DNS_SECTION_ADDITIONAL :
DNS_SECTION_AUTHORITY;
result = query_addsoa(client, db, version, UINT32_MAX,
associated, section);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(result);
goto cleanup;
}
/*
* Add NSEC record if we found one.
*/
if (WANTDNSSEC(client)) {
if (dns_rdataset_isassociated(rdataset))
query_addnxrrsetnsec(client, db, version,
&fname, &rdataset,
&sigrdataset);
}
goto cleanup;
case DNS_R_EMPTYWILD:
empty_wild = true;
/* FALLTHROUGH */
case DNS_R_NXDOMAIN:
INSIST(is_zone || REDIRECT(client));
if (!empty_wild) {
tresult = redirect(client, fname, rdataset, &node,
&db, &version, type);
if (tresult == ISC_R_SUCCESS) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect);
break;
}
if (tresult == DNS_R_NXRRSET) {
redirected = true;
goto iszone_nxrrset;
}
if (tresult == DNS_R_NCACHENXRRSET) {
redirected = true;
is_zone = false;
goto ncache_nxrrset;
}
tresult = redirect2(client, fname, rdataset, &node,
&db, &version, type, &is_zone);
if (tresult == DNS_R_CONTINUE) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect_rlookup);
client->query.redirect.qtype = qtype;
INSIST(rdataset != NULL);
SAVE(client->query.redirect.rdataset, rdataset);
SAVE(client->query.redirect.sigrdataset,
sigrdataset);
SAVE(client->query.redirect.db, db);
SAVE(client->query.redirect.node, node);
SAVE(client->query.redirect.zone, zone);
client->query.redirect.result = DNS_R_NXDOMAIN;
dns_name_copy(fname,
client->query.redirect.fname,
NULL);
client->query.redirect.authoritative =
authoritative;
client->query.redirect.is_zone = is_zone;
goto cleanup;
}
if (tresult == ISC_R_SUCCESS) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect);
break;
}
if (tresult == DNS_R_NXRRSET) {
redirected = true;
goto iszone_nxrrset;
}
if (tresult == DNS_R_NCACHENXRRSET) {
redirected = true;
is_zone = false;
goto ncache_nxrrset;
}
}
if (dns_rdataset_isassociated(rdataset)) {
/*
* If we've got a NSEC record, we need to save the
* name now because we're going call query_addsoa()
* below, and it needs to use the name buffer.
*/
query_keepname(client, fname, dbuf);
} else if (fname != NULL) {
/*
* We're not going to use fname, and need to release
* our hold on the name buffer so query_addsoa()
* may use it.
*/
query_releasename(client, &fname);
}
/*
* Add SOA to the additional section if generated by a
* RPZ rewrite.
*
* If the query was for a SOA record force the
* ttl to zero so that it is possible for clients to find
* the containing zone of an arbitrary name with a stub
* resolver and not have it cached.
*/
associated = dns_rdataset_isassociated(rdataset);
section = nxrewrite ? DNS_SECTION_ADDITIONAL :
DNS_SECTION_AUTHORITY;
ttl = UINT32_MAX;
if (!nxrewrite && qtype == dns_rdatatype_soa &&
zone != NULL && dns_zone_getzeronosoattl(zone))
ttl = 0;
result = query_addsoa(client, db, version, ttl, associated,
section);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(result);
goto cleanup;
}
if (WANTDNSSEC(client)) {
/*
* Add NSEC record if we found one.
*/
if (dns_rdataset_isassociated(rdataset))
query_addrrset(client, &fname, &rdataset,
&sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
query_addwildcardproof(client, db, version,
client->query.qname, false,
false);
}
/*
* Set message rcode.
*/
if (empty_wild)
client->message->rcode = dns_rcode_noerror;
else
client->message->rcode = dns_rcode_nxdomain;
goto cleanup;
case DNS_R_NCACHENXDOMAIN:
tresult = redirect(client, fname, rdataset, &node,
&db, &version, type);
if (tresult == ISC_R_SUCCESS) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect);
break;
}
if (tresult == DNS_R_NXRRSET) {
redirected = true;
is_zone = true;
goto iszone_nxrrset;
}
if (tresult == DNS_R_NCACHENXRRSET) {
redirected = true;
result = tresult;
goto ncache_nxrrset;
}
tresult = redirect2(client, fname, rdataset, &node,
&db, &version, type, &is_zone);
if (tresult == DNS_R_CONTINUE) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect_rlookup);
SAVE(client->query.redirect.db, db);
SAVE(client->query.redirect.node, node);
SAVE(client->query.redirect.zone, zone);
client->query.redirect.qtype = qtype;
INSIST(rdataset != NULL);
SAVE(client->query.redirect.rdataset, rdataset);
SAVE(client->query.redirect.sigrdataset, sigrdataset);
client->query.redirect.result = DNS_R_NCACHENXDOMAIN;
dns_name_copy(fname, client->query.redirect.fname,
NULL);
client->query.redirect.authoritative = authoritative;
client->query.redirect.is_zone = is_zone;
goto cleanup;
}
if (tresult == ISC_R_SUCCESS) {
inc_stats(client,
dns_nsstatscounter_nxdomainredirect);
break;
}
if (tresult == DNS_R_NXRRSET) {
redirected = true;
is_zone = true;
goto iszone_nxrrset;
}
if (tresult == DNS_R_NCACHENXRRSET) {
redirected = true;
result = tresult;
goto ncache_nxrrset;
}
/* FALLTHROUGH */
case DNS_R_NCACHENXRRSET:
ncache_nxrrset:
INSIST(!is_zone);
authoritative = false;
/*
* Set message rcode, if required.
*/
if (result == DNS_R_NCACHENXDOMAIN)
client->message->rcode = dns_rcode_nxdomain;
/*
* Look for RFC 1918 leakage from Internet.
*/
if (result == DNS_R_NCACHENXDOMAIN &&
qtype == dns_rdatatype_ptr &&
client->message->rdclass == dns_rdataclass_in &&
dns_name_countlabels(fname) == 7)
warn_rfc1918(client, fname, rdataset);
#ifdef dns64_bis_return_excluded_addresses
if (dns64)
#else
if (dns64 && !dns64_exclude)
#endif
{
/*
* Restore the answers from the previous AAAA lookup.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
RESTORE(rdataset, client->query.dns64_aaaa);
RESTORE(sigrdataset, client->query.dns64_sigaaaa);
if (fname == NULL) {
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: "
"query_getnamebuf failed (4)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
CTRACE(ISC_LOG_ERROR,
"query_find: "
"query_newname failed (4)");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
}
dns_name_copy(client->query.qname, fname, NULL);
dns64 = false;
#ifdef dns64_bis_return_excluded_addresses
if (dns64_excluded)
break;
#endif
} else if (result == DNS_R_NCACHENXRRSET &&
!ISC_LIST_EMPTY(client->view->dns64) &&
client->message->rdclass == dns_rdataclass_in &&
qtype == dns_rdatatype_aaaa)
{
/*
* Look to see if there are A records for this
* name.
*/
/*
* If the ttl is zero we need to workout if we have just
* decremented to zero or if there was no negative cache
* ttl in the answer.
*/
if (rdataset->ttl != 0)
client->query.dns64_ttl = rdataset->ttl;
else if (dns_rdataset_first(rdataset) == ISC_R_SUCCESS)
client->query.dns64_ttl = 0;
SAVE(client->query.dns64_aaaa, rdataset);
SAVE(client->query.dns64_sigaaaa, sigrdataset);
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
type = qtype = dns_rdatatype_a;
dns64 = true;
goto db_find;
}
/*
* We don't call query_addrrset() because we don't need any
* of its extra features (and things would probably break!).
*/
if (dns_rdataset_isassociated(rdataset)) {
query_keepname(client, fname, dbuf);
dns_message_addname(client->message, fname,
DNS_SECTION_AUTHORITY);
ISC_LIST_APPEND(fname->list, rdataset, link);
fname = NULL;
rdataset = NULL;
}
goto cleanup;
case DNS_R_CNAME:
/*
* If we have a zero ttl from the cache refetch it.
*/
if (!is_zone && !resuming && rdataset->ttl == 0 &&
RECURSIONOK(client))
{
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
INSIST(!REDIRECT(client));
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else
RECURSE_ERROR(result);
goto cleanup;
}
/*
* Keep a copy of the rdataset. We have to do this because
* query_addrrset may clear 'rdataset' (to prevent the
* cleanup code from cleaning it up).
*/
trdataset = rdataset;
/*
* Add the CNAME to the answer section.
*/
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname),
NULL);
need_wildcardproof = true;
}
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
if (!is_zone && RECURSIONOK(client))
query_prefetch(client, fname, rdataset);
query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
DNS_SECTION_ANSWER);
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
/*
* We set the PARTIALANSWER attribute so that if anything goes
* wrong later on, we'll return what we've got so far.
*/
client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Reset qname to be the target name of the CNAME and restart
* the query.
*/
tname = NULL;
result = dns_message_gettempname(client->message, &tname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&rdata);
dns_name_init(tname, NULL);
result = dns_name_dup(&cname.cname, client->mctx, tname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
dns_rdata_freestruct(&cname);
goto cleanup;
}
dns_rdata_freestruct(&cname);
ns_client_qnamereplace(client, tname);
want_restart = true;
if (!WANTRECURSION(client))
options |= DNS_GETDB_NOLOG;
goto addauth;
case DNS_R_DNAME:
/*
* Compare the current qname to the found name. We need
* to know how many labels and bits are in common because
* we're going to have to split qname later on.
*/
namereln = dns_name_fullcompare(client->query.qname, fname,
&order, &nlabels);
INSIST(namereln == dns_namereln_subdomain);
/*
* Keep a copy of the rdataset. We have to do this because
* query_addrrset may clear 'rdataset' (to prevent the
* cleanup code from cleaning it up).
*/
trdataset = rdataset;
/*
* Add the DNAME to the answer section.
*/
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname),
NULL);
need_wildcardproof = true;
}
if (!is_zone && RECURSIONOK(client))
query_prefetch(client, fname, rdataset);
query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
DNS_SECTION_ANSWER);
/*
* We set the PARTIALANSWER attribute so that if anything goes
* wrong later on, we'll return what we've got so far.
*/
client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Get the target name of the DNAME.
*/
tname = NULL;
result = dns_message_gettempname(client->message, &tname);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &dname, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&rdata);
dns_name_clone(&dname.dname, tname);
dns_rdata_freestruct(&dname);
/*
* Construct the new qname consisting of
* <found name prefix>.<dname target>
*/
prefix = dns_fixedname_initname(&fixed);
dns_name_split(client->query.qname, nlabels, prefix, NULL);
INSIST(fname == NULL);
dbuf = query_getnamebuf(client);
if (dbuf == NULL) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
fname = query_newname(client, dbuf, &b);
if (fname == NULL) {
dns_message_puttempname(client->message, &tname);
goto cleanup;
}
result = dns_name_concatenate(prefix, tname, fname, NULL);
dns_message_puttempname(client->message, &tname);
/*
* RFC2672, section 4.1, subsection 3c says
* we should return YXDOMAIN if the constructed
* name would be too long.
*/
if (result == DNS_R_NAMETOOLONG)
client->message->rcode = dns_rcode_yxdomain;
if (result != ISC_R_SUCCESS)
goto cleanup;
query_keepname(client, fname, dbuf);
/*
* Synthesize a CNAME consisting of
* <old qname> <dname ttl> CNAME <new qname>
* with <dname trust value>
*
* Synthesize a CNAME so old old clients that don't understand
* DNAME can chain.
*
* We do not try to synthesize a signature because we hope
* that security aware servers will understand DNAME. Also,
* even if we had an online key, making a signature
* on-the-fly is costly, and not really legitimate anyway
* since the synthesized CNAME is NOT in the zone.
*/
result = query_add_cname(client, client->query.qname, fname,
trdataset->trust, trdataset->ttl);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* If the original query was not for a CNAME or ANY then
* follow the CNAME.
*/
if (qtype != dns_rdatatype_cname &&
qtype != dns_rdatatype_any)
{
/*
* Switch to the new qname and restart.
*/
ns_client_qnamereplace(client, fname);
fname = NULL;
want_restart = true;
if (!WANTRECURSION(client))
options |= DNS_GETDB_NOLOG;
}
goto addauth;
default:
/*
* Something has gone wrong.
*/
snprintf(errmsg, sizeof(errmsg) - 1,
"query_find: unexpected error after resuming: %s",
isc_result_totext(result));
CTRACE(ISC_LOG_ERROR, errmsg);
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
if (WANTDNSSEC(client) &&
(fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&wildcardname);
dns_name_copy(fname, dns_fixedname_name(&wildcardname), NULL);
need_wildcardproof = true;
}
#ifdef ALLOW_FILTER_AAAA
/*
* The filter-aaaa-on-v4 option should suppress AAAAs for IPv4
* clients if there is an A; filter-aaaa-on-v6 option does the same
* for IPv6 clients.
*/
client->filter_aaaa = dns_aaaa_ok;
if (client->view->v4_aaaa != dns_aaaa_ok ||
client->view->v6_aaaa != dns_aaaa_ok)
{
result = ns_client_checkaclsilent(client, NULL,
client->view->aaaa_acl,
true);
if (result == ISC_R_SUCCESS &&
client->view->v4_aaaa != dns_aaaa_ok &&
is_v4_client(client))
client->filter_aaaa = client->view->v4_aaaa;
else if (result == ISC_R_SUCCESS &&
client->view->v6_aaaa != dns_aaaa_ok &&
is_v6_client(client))
client->filter_aaaa = client->view->v6_aaaa;
}
#endif
if (type == dns_rdatatype_any) {
/*
* For minimal-any, we only add records that
* match this type or cover this type.
*/
dns_rdatatype_t onetype = 0;
#ifdef ALLOW_FILTER_AAAA
bool have_aaaa, have_a, have_sig;
/*
* If we are not authoritative, assume there is a A
* even in if it is not in our cache. This assumption could
* be wrong but it is a good bet.
*/
have_aaaa = false;
have_a = !authoritative;
have_sig = false;
#endif
/*
* XXXRTH Need to handle zonecuts with special case
* code.
*/
n = 0;
rdsiter = NULL;
result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
if (result != ISC_R_SUCCESS) {
CTRACE(ISC_LOG_ERROR,
"query_find: type any; allrdatasets failed");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
/*
* Calling query_addrrset() with a non-NULL dbuf is going
* to either keep or release the name. We don't want it to
* release fname, since we may have to call query_addrrset()
* more than once. That means we have to call query_keepname()
* now, and pass a NULL dbuf to query_addrrset().
*
* If we do a query_addrrset() below, we must set fname to
* NULL before leaving this block, otherwise we might try to
* cleanup fname even though we're using it!
*/
query_keepname(client, fname, dbuf);
tname = fname;
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, rdataset);
#ifdef ALLOW_FILTER_AAAA
/*
* Notice the presence of A and AAAAs so
* that AAAAs can be hidden from IPv4 clients.
*/
if (client->filter_aaaa != dns_aaaa_ok) {
if (rdataset->type == dns_rdatatype_aaaa)
have_aaaa = true;
else if (rdataset->type == dns_rdatatype_a)
have_a = true;
}
#endif
/*
* We found an NS RRset; no need to add one later.
*/
if (qtype == dns_rdatatype_any &&
rdataset->type == dns_rdatatype_ns)
{
answer_has_ns = true;
}
if (is_zone && qtype == dns_rdatatype_any &&
!dns_db_issecure(db) &&
dns_rdatatype_isdnssec(rdataset->type)) {
/*
* The zone is transitioning from insecure
* to secure. Hide the dnssec records from
* ANY queries.
*/
dns_rdataset_disassociate(rdataset);
} else if (client->view->minimal_any &&
!TCP(client) && !WANTDNSSEC(client) &&
qtype == dns_rdatatype_any &&
(rdataset->type == dns_rdatatype_sig ||
rdataset->type == dns_rdatatype_rrsig)) {
CTRACE(ISC_LOG_DEBUG(5), "query_find: "
"minimal-any skip signature");
dns_rdataset_disassociate(rdataset);
} else if (client->view->minimal_any &&
!TCP(client) && onetype != 0 &&
rdataset->type != onetype &&
rdataset->covers != onetype) {
CTRACE(ISC_LOG_DEBUG(5), "query_find: "
"minimal-any skip rdataset");
dns_rdataset_disassociate(rdataset);
} else if ((qtype == dns_rdatatype_any ||
rdataset->type == qtype) && rdataset->type != 0) {
#ifdef ALLOW_FILTER_AAAA
if (dns_rdatatype_isdnssec(rdataset->type))
have_sig = true;
#endif
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
rpz_st = client->query.rpz_st;
if (rpz_st != NULL)
rdataset->ttl = ISC_MIN(rdataset->ttl,
rpz_st->m.ttl);
if (!is_zone && RECURSIONOK(client)) {
dns_name_t *name;
name = (fname != NULL) ? fname : tname;
query_prefetch(client, name, rdataset);
}
/*
* Remember the first RRtype we find so we
* can skip others with minimal-any.
*/
if (rdataset->type == dns_rdatatype_sig ||
rdataset->type == dns_rdatatype_rrsig)
onetype = rdataset->covers;
else
onetype = rdataset->type;
query_addrrset(client,
fname != NULL ? &fname : &tname,
&rdataset, NULL,
NULL, DNS_SECTION_ANSWER);
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
n++;
INSIST(tname != NULL);
/*
* rdataset is non-NULL only in certain
* pathological cases involving DNAMEs.
*/
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
rdataset = query_newrdataset(client);
if (rdataset == NULL)
break;
} else {
/*
* We're not interested in this rdataset.
*/
dns_rdataset_disassociate(rdataset);
}
result = dns_rdatasetiter_next(rdsiter);
}
#ifdef ALLOW_FILTER_AAAA
/*
* Filter AAAAs if there is an A and there is no signature
* or we are supposed to break DNSSEC.
*/
if (client->filter_aaaa == dns_aaaa_break_dnssec)
client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
else if (client->filter_aaaa != dns_aaaa_ok &&
have_aaaa && have_a &&
(!have_sig || !WANTDNSSEC(client)))
client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
#endif
if (fname != NULL)
dns_message_puttempname(client->message, &fname);
if (n == 0) {
/*
* No matching rdatasets found in cache. If we were
* searching for RRSIG/SIG, that's probably okay;
* otherwise this is an error condition.
*/
if ((qtype == dns_rdatatype_rrsig ||
qtype == dns_rdatatype_sig) &&
result == ISC_R_NOMORE) {
if (!is_zone) {
authoritative = false;
dns_rdatasetiter_destroy(&rdsiter);
client->attributes &= ~NS_CLIENTATTR_RA;
goto addauth;
}
if (qtype == dns_rdatatype_rrsig &&
dns_db_issecure(db)) {
char namebuf[DNS_NAME_FORMATSIZE];
dns_name_format(client->query.qname,
namebuf,
sizeof(namebuf));
ns_client_log(client,
DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"missing signature "
"for %s", namebuf);
}
dns_rdatasetiter_destroy(&rdsiter);
fname = query_newname(client, dbuf, &b);
goto nxrrset_rrsig;
} else {
CTRACE(ISC_LOG_ERROR,
"query_find: no matching rdatasets "
"in cache");
result = DNS_R_SERVFAIL;
}
}
dns_rdatasetiter_destroy(&rdsiter);
if (result != ISC_R_NOMORE) {
CTRACE(ISC_LOG_ERROR,
"query_find: dns_rdatasetiter_destroy failed");
QUERY_ERROR(DNS_R_SERVFAIL);
goto cleanup;
}
} else {
/*
* This is the "normal" case -- an ordinary question to which
* we know the answer.
*/
/*
* If we have a zero ttl from the cache refetch it.
*/
if (!is_zone && !resuming && rdataset->ttl == 0 &&
RECURSIONOK(client))
{
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
if (node != NULL)
dns_db_detachnode(db, &node);
INSIST(!REDIRECT(client));
result = query_recurse(client, qtype,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (dns64)
client->query.attributes |=
NS_QUERYATTR_DNS64;
if (dns64_exclude)
client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else
RECURSE_ERROR(result);
goto cleanup;
}
/*
* Check to see if the AAAA RRset has non-excluded addresses
* in it. If not look for a A RRset.
*
* Note: the order of dns64_aaaaok() and filter_aaaa check is
* important. Both result is fetches being called but the
* dns64 case goes to db_find while the filter_aaaa case
* adds the records now for later potential exclusion.
*/
INSIST(client->query.dns64_aaaaok == NULL);
if (qtype == dns_rdatatype_aaaa && !dns64_exclude &&
!ISC_LIST_EMPTY(client->view->dns64) &&
client->message->rdclass == dns_rdataclass_in &&
!dns64_aaaaok(client, rdataset, sigrdataset)) {
/*
* Look to see if there are A records for this
* name.
*/
client->query.dns64_ttl = rdataset->ttl;
SAVE(client->query.dns64_aaaa, rdataset);
SAVE(client->query.dns64_sigaaaa, sigrdataset);
query_releasename(client, &fname);
dns_db_detachnode(db, &node);
type = qtype = dns_rdatatype_a;
dns64_exclude = dns64 = true;
goto db_find;
}
#ifdef ALLOW_FILTER_AAAA
/*
* Optionally hide AAAAs from IPv4 clients if there is an A.
* We add the AAAAs now, but might refuse to render them later
* after DNSSEC is figured out.
* This could be more efficient, but the whole idea is
* so fundamentally wrong, unavoidably inaccurate, and
* unneeded that it is best to keep it as short as possible.
*/
if (client->filter_aaaa == dns_aaaa_break_dnssec ||
(client->filter_aaaa == dns_aaaa_filter &&
(!WANTDNSSEC(client) || sigrdataset == NULL ||
!dns_rdataset_isassociated(sigrdataset))))
{
if (qtype == dns_rdatatype_aaaa) {
trdataset = query_newrdataset(client);
result = dns_db_findrdataset(db, node, version,
dns_rdatatype_a, 0,
client->now,
trdataset, NULL);
if (dns_rdataset_isassociated(trdataset))
dns_rdataset_disassociate(trdataset);
query_putrdataset(client, &trdataset);
/*
* We have an AAAA but the A is not in our cache.
* Assume any result other than DNS_R_DELEGATION
* or ISC_R_NOTFOUND means there is no A and
* so AAAAs are ok.
* Assume there is no A if we can't recurse
* for this client, although that could be
* the wrong answer. What else can we do?
* Besides, that we have the AAAA and are using
* this mechanism suggests that we care more
* about As than AAAAs and would have cached
* the A if it existed.
*/
if (result == ISC_R_SUCCESS) {
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA;
} else if (authoritative ||
!RECURSIONOK(client) ||
(result != DNS_R_DELEGATION &&
result != ISC_R_NOTFOUND)) {
client->attributes &=
~NS_CLIENTATTR_FILTER_AAAA;
} else {
/*
* This is an ugly kludge to recurse
* for the A and discard the result.
*
* Continue to add the AAAA now.
* We'll make a note to not render it
* if the recursion for the A succeeds.
*/
INSIST(!REDIRECT(client));
result = query_recurse(client,
dns_rdatatype_a,
client->query.qname,
NULL, NULL, resuming);
if (result == ISC_R_SUCCESS) {
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA_RC;
client->query.attributes |=
NS_QUERYATTR_RECURSING;
}
}
} else if (qtype == dns_rdatatype_a &&
(client->attributes &
NS_CLIENTATTR_FILTER_AAAA_RC) != 0) {
client->attributes &=
~NS_CLIENTATTR_FILTER_AAAA_RC;
client->attributes |=
NS_CLIENTATTR_FILTER_AAAA;
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
goto cleanup;
}
}
#endif
if (sigrdataset != NULL)
sigrdatasetp = &sigrdataset;
else
sigrdatasetp = NULL;
if (NOQNAME(rdataset) && WANTDNSSEC(client))
noqname = rdataset;
else
noqname = NULL;
/*
* Special case NS handling
*/
if (is_zone && qtype == dns_rdatatype_ns) {
/*
* We've already got an NS, no need to add one in
* the authority section
*/
if (dns_name_equal(client->query.qname,
dns_db_origin(db)))
{
answer_has_ns = true;
}
/*
* Always add glue for root priming queries, regardless
* of "minimal-responses" setting.
*/
if (dns_name_equal(client->query.qname, dns_rootname)) {
client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
dns_db_attach(db, &client->query.gluedb);
}
}
/*
* Return the time to expire for slave and master zones.
*/
if (zone != NULL && is_zone && qtype == dns_rdatatype_soa &&
(client->attributes & NS_CLIENTATTR_WANTEXPIRE) != 0 &&
client->query.restarts == 0) {
dns_zone_t *raw = NULL, *mayberaw;
dns_zone_getraw(zone, &raw);
mayberaw = (raw != NULL) ? raw : zone;
if (dns_zone_gettype(mayberaw) == dns_zone_slave) {
isc_time_t expiretime;
uint32_t secs;
dns_zone_getexpiretime(zone, &expiretime);
secs = isc_time_seconds(&expiretime);
if (secs >= client->now &&
result == ISC_R_SUCCESS) {
client->attributes |=
NS_CLIENTATTR_HAVEEXPIRE;
client->expire = secs - client->now;
}
}
if (dns_zone_gettype(mayberaw) == dns_zone_master) {
dns_rdata_soa_t soa;
result = dns_rdataset_first(rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
client->expire = soa.expire;
client->attributes |= NS_CLIENTATTR_HAVEEXPIRE;
}
if (raw != NULL)
dns_zone_detach(&raw);
}
if (dns64) {
qtype = type = dns_rdatatype_aaaa;
result = query_dns64(client, &fname, rdataset,
sigrdataset, dbuf,
DNS_SECTION_ANSWER);
noqname = NULL;
dns_rdataset_disassociate(rdataset);
dns_message_puttemprdataset(client->message, &rdataset);
if (result == ISC_R_NOMORE) {
#ifndef dns64_bis_return_excluded_addresses
if (dns64_exclude) {
if (!is_zone)
goto cleanup;
/*
* Add a fake SOA record.
*/
(void)query_addsoa(client, db, version,
600, false,
DNS_SECTION_AUTHORITY);
goto cleanup;
}
#endif
if (is_zone)
goto iszone_nxrrset;
else
goto ncache_nxrrset;
} else if (result != ISC_R_SUCCESS) {
eresult = result;
goto cleanup;
}
} else if (client->query.dns64_aaaaok != NULL) {
query_filter64(client, &fname, rdataset, dbuf,
DNS_SECTION_ANSWER);
query_putrdataset(client, &rdataset);
} else {
if (!is_zone && RECURSIONOK(client))
query_prefetch(client, fname, rdataset);
query_addrrset(client, &fname, &rdataset,
sigrdatasetp, dbuf, DNS_SECTION_ANSWER);
}
if (noqname != NULL)
query_addnoqnameproof(client, noqname);
/*
* We shouldn't ever fail to add 'rdataset'
* because it's already in the answer.
*/
INSIST(rdataset == NULL);
}
addauth:
CTRACE(ISC_LOG_DEBUG(3), "query_find: addauth");
/*
* Add NS records to the authority section (if we haven't already
* added them to the answer section).
*/
if (!want_restart && !NOAUTHORITY(client)) {
if (is_zone) {
if (!answer_has_ns) {
(void)query_addns(client, db, version);
}
} else if (!answer_has_ns && qtype != dns_rdatatype_ns) {
if (fname != NULL) {
query_releasename(client, &fname);
}
query_addbestns(client);
}
}
/*
* Add NSEC records to the authority section if they're needed for
* DNSSEC wildcard proofs.
*/
if (need_wildcardproof && dns_db_issecure(db))
query_addwildcardproof(client, db, version,
dns_fixedname_name(&wildcardname),
true, false);
cleanup:
CTRACE(ISC_LOG_DEBUG(3), "query_find: cleanup");
/*
* General cleanup.
*/
rpz_st = client->query.rpz_st;
if (rpz_st != NULL && (rpz_st->state & DNS_RPZ_RECURSING) == 0) {
rpz_match_clear(rpz_st);
rpz_st->state &= ~DNS_RPZ_DONE_QNAME;
}
if (rdataset != NULL)
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL)
query_putrdataset(client, &sigrdataset);
if (fname != NULL)
query_releasename(client, &fname);
if (node != NULL)
dns_db_detachnode(db, &node);
if (db != NULL)
dns_db_detach(&db);
if (zone != NULL)
dns_zone_detach(&zone);
if (zdb != NULL) {
query_putrdataset(client, &zrdataset);
if (zsigrdataset != NULL)
query_putrdataset(client, &zsigrdataset);
if (zfname != NULL)
query_releasename(client, &zfname);
dns_db_detach(&zdb);
}
if (event != NULL) {
free_devent(client, ISC_EVENT_PTR(&event), &event);
}
if (client->query.gluedb != NULL) {
dns_db_detach(&client->query.gluedb);
}
/*
* AA bit.
*/
if (client->query.restarts == 0 && !authoritative) {
/*
* We're not authoritative, so we must ensure the AA bit
* isn't set.
*/
client->message->flags &= ~DNS_MESSAGEFLAG_AA;
}
/*
* Restart the query?
*/
if (want_restart && client->query.restarts < MAX_RESTARTS) {
client->query.restarts++;
goto restart;
}
if (eresult != ISC_R_SUCCESS &&
(!PARTIALANSWER(client) || WANTRECURSION(client)
|| eresult == DNS_R_DROP)) {
if (eresult == DNS_R_DUPLICATE || eresult == DNS_R_DROP) {
/*
* This was a duplicate query that we are
* recursing on or the result of rate limiting.
* Don't send a response now for a duplicate query,
* because the original will still cause a response.
*/
query_next(client, eresult);
} else {
/*
* If we don't have any answer to give the client,
* or if the client requested recursion and thus wanted
* the complete answer, send an error response.
*/
INSIST(line >= 0);
query_error(client, eresult, line);
}
ns_client_detach(&client);
} else if (!RECURSING(client)) {
/*
* We are done. Set up sortlist data for the message
* rendering code, make a final tweak to the AA bit if the
* auth-nxdomain config option says so, then render and
* send the response.
*/
setup_query_sortlist(client);
/*
* If this is a referral and the answer to the question
* is in the glue sort it to the start of the additional
* section.
*/
if (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) &&
client->message->rcode == dns_rcode_noerror &&
(qtype == dns_rdatatype_a || qtype == dns_rdatatype_aaaa))
answer_in_glue(client, qtype);
if (client->message->rcode == dns_rcode_nxdomain &&
client->view->auth_nxdomain == true)
client->message->flags |= DNS_MESSAGEFLAG_AA;
/*
* If the response is somehow unexpected for the client and this
* is a result of recursion, return an error to the caller
* to indicate it may need to be logged.
*/
if (resuming &&
(ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) ||
client->message->rcode != dns_rcode_noerror))
eresult = ISC_R_FAILURE;
query_send(client);
ns_client_detach(&client);
}
CTRACE(ISC_LOG_DEBUG(3), "query_find: done");
return (eresult);
}
static inline void
log_tat(ns_client_t *client) {
char namebuf[DNS_NAME_FORMATSIZE];
char clientbuf[ISC_NETADDR_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
isc_netaddr_t netaddr;
char *tags = NULL;
size_t taglen = 0;
if (!isc_log_wouldlog(ns_g_lctx, ISC_LOG_INFO)) {
return;
}
if ((client->query.qtype != dns_rdatatype_null ||
!dns_name_istat(client->query.qname)) &&
(client->keytag == NULL ||
client->query.qtype != dns_rdatatype_dnskey))
{
return;
}
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
isc_netaddr_format(&netaddr, clientbuf, sizeof(clientbuf));
dns_rdataclass_format(client->view->rdclass, classbuf,
sizeof(classbuf));
if (client->query.qtype == dns_rdatatype_dnskey) {
uint16_t keytags = client->keytag_len / 2;
size_t len = taglen = sizeof("65000") * keytags + 1;
char *cp = tags = isc_mem_get(client->mctx, taglen);
int i = 0;
INSIST(client->keytag != NULL);
if (tags != NULL) {
while (keytags-- > 0U) {
int n;
uint16_t keytag;
keytag = (client->keytag[i * 2] << 8) |
client->keytag[i * 2 + 1];
n = snprintf(cp, len, " %u", keytag);
if (n > 0 && (size_t)n <= len) {
cp += n;
len -= n;
i++;
} else {
break;
}
}
}
}
isc_log_write(ns_g_lctx, NS_LOGCATEGORY_TAT, NS_LOGMODULE_QUERY,
ISC_LOG_INFO, "trust-anchor-telemetry '%s/%s' from %s%s",
namebuf, classbuf, clientbuf, tags != NULL? tags : "");
if (tags != NULL) {
isc_mem_put(client->mctx, tags, taglen);
}
}
static inline void
log_query(ns_client_t *client, unsigned int flags, unsigned int extflags) {
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
char onbuf[ISC_NETADDR_FORMATSIZE];
char ednsbuf[sizeof("E(65535)")] = { 0 };
dns_rdataset_t *rdataset;
int level = ISC_LOG_INFO;
if (! isc_log_wouldlog(ns_g_lctx, level))
return;
rdataset = ISC_LIST_HEAD(client->query.qname->list);
INSIST(rdataset != NULL);
dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
dns_rdataclass_format(rdataset->rdclass, classbuf, sizeof(classbuf));
dns_rdatatype_format(rdataset->type, typebuf, sizeof(typebuf));
isc_netaddr_format(&client->destaddr, onbuf, sizeof(onbuf));
if (client->ednsversion >= 0)
snprintf(ednsbuf, sizeof(ednsbuf), "E(%hd)",
client->ednsversion);
ns_client_log(client, NS_LOGCATEGORY_QUERIES, NS_LOGMODULE_QUERY,
level, "query: %s %s %s %s%s%s%s%s%s%s (%s)", namebuf,
classbuf, typebuf, WANTRECURSION(client) ? "+" : "-",
(client->signer != NULL) ? "S" : "", ednsbuf,
TCP(client) ? "T" : "",
((extflags & DNS_MESSAGEEXTFLAG_DO) != 0) ? "D" : "",
((flags & DNS_MESSAGEFLAG_CD) != 0) ? "C" : "",
HAVECOOKIE(client) ? "V" : WANTCOOKIE(client) ? "K" : "",
onbuf);
}
static inline void
log_queryerror(ns_client_t *client, isc_result_t result, int line, int level) {
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
const char *namep, *typep, *classp, *sep1, *sep2;
dns_rdataset_t *rdataset;
if (!isc_log_wouldlog(ns_g_lctx, level))
return;
namep = typep = classp = sep1 = sep2 = "";
/*
* Query errors can happen for various reasons. In some cases we cannot
* even assume the query contains a valid question section, so we should
* expect exceptional cases.
*/
if (client->query.origqname != NULL) {
dns_name_format(client->query.origqname, namebuf,
sizeof(namebuf));
namep = namebuf;
sep1 = " for ";
rdataset = ISC_LIST_HEAD(client->query.origqname->list);
if (rdataset != NULL) {
dns_rdataclass_format(rdataset->rdclass, classbuf,
sizeof(classbuf));
classp = classbuf;
dns_rdatatype_format(rdataset->type, typebuf,
sizeof(typebuf));
typep = typebuf;
sep2 = "/";
}
}
ns_client_log(client, NS_LOGCATEGORY_QUERY_ERRORS, NS_LOGMODULE_QUERY,
level, "query failed (%s)%s%s%s%s%s%s at %s:%d",
isc_result_totext(result), sep1, namep, sep2,
classp, sep2, typep, __FILE__, line);
}
void
ns_query_start(ns_client_t *client) {
isc_result_t result;
dns_message_t *message;
dns_rdataset_t *rdataset;
ns_client_t *qclient;
dns_rdatatype_t qtype;
unsigned int saved_extflags;
unsigned int saved_flags;
REQUIRE(NS_CLIENT_VALID(client));
message = client->message;
saved_extflags = client->extflags;
saved_flags = client->message->flags;
CTRACE(ISC_LOG_DEBUG(3), "ns_query_start");
/*
* Test only.
*/
if (ns_g_clienttest && !TCP(client)) {
result = ns_client_replace(client);
if (result == ISC_R_SHUTTINGDOWN) {
ns_client_next(client, result);
return;
} else if (result != ISC_R_SUCCESS) {
query_error(client, result, __LINE__);
return;
}
}
/*
* Ensure that appropriate cleanups occur.
*/
client->next = query_next_callback;
/*
* Behave as if we don't support DNSSEC if not enabled.
*/
if (!client->view->enablednssec) {
message->flags &= ~DNS_MESSAGEFLAG_CD;
client->extflags &= ~DNS_MESSAGEEXTFLAG_DO;
}
if ((message->flags & DNS_MESSAGEFLAG_RD) != 0)
client->query.attributes |= NS_QUERYATTR_WANTRECURSION;
if ((client->extflags & DNS_MESSAGEEXTFLAG_DO) != 0)
client->attributes |= NS_CLIENTATTR_WANTDNSSEC;
switch (client->view->minimalresponses) {
case dns_minimal_no:
break;
case dns_minimal_yes:
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
break;
case dns_minimal_noauth:
client->query.attributes |= NS_QUERYATTR_NOAUTHORITY;
break;
case dns_minimal_noauthrec:
if ((message->flags & DNS_MESSAGEFLAG_RD) != 0)
client->query.attributes |= NS_QUERYATTR_NOAUTHORITY;
break;
}
if ((client->view->cachedb == NULL)
|| (!client->view->additionalfromcache)) {
/*
* We don't have a cache. Turn off cache support and
* recursion.
*/
client->query.attributes &=
~(NS_QUERYATTR_RECURSIONOK|NS_QUERYATTR_CACHEOK);
client->attributes |= NS_CLIENTATTR_NOSETFC;
} else if ((client->attributes & NS_CLIENTATTR_RA) == 0 ||
(message->flags & DNS_MESSAGEFLAG_RD) == 0) {
/*
* If the client isn't allowed to recurse (due to
* "recursion no", the allow-recursion ACL, or the
* lack of a resolver in this view), or if it
* doesn't want recursion, turn recursion off.
*/
client->query.attributes &= ~NS_QUERYATTR_RECURSIONOK;
client->attributes |= NS_CLIENTATTR_NOSETFC;
}
/*
* Check for multiple question queries, since edns1 is dead.
*/
if (message->counts[DNS_SECTION_QUESTION] > 1) {
query_error(client, DNS_R_FORMERR, __LINE__);
return;
}
/*
* Get the question name.
*/
result = dns_message_firstname(message, DNS_SECTION_QUESTION);
if (result != ISC_R_SUCCESS) {
query_error(client, result, __LINE__);
return;
}
dns_message_currentname(message, DNS_SECTION_QUESTION,
&client->query.qname);
client->query.origqname = client->query.qname;
result = dns_message_nextname(message, DNS_SECTION_QUESTION);
if (result != ISC_R_NOMORE) {
if (result == ISC_R_SUCCESS) {
/*
* There's more than one QNAME in the question
* section.
*/
query_error(client, DNS_R_FORMERR, __LINE__);
} else
query_error(client, result, __LINE__);
return;
}
if (ns_g_server->log_queries)
log_query(client, saved_flags, saved_extflags);
/*
* Check for meta-queries like IXFR and AXFR.
*/
rdataset = ISC_LIST_HEAD(client->query.qname->list);
INSIST(rdataset != NULL);
client->query.qtype = qtype = rdataset->type;
dns_rdatatypestats_increment(ns_g_server->rcvquerystats, qtype);
log_tat(client);
if (dns_rdatatype_ismeta(qtype)) {
switch (qtype) {
case dns_rdatatype_any:
break; /* Let query_find handle it. */
case dns_rdatatype_ixfr:
case dns_rdatatype_axfr:
ns_xfr_start(client, rdataset->type);
return;
case dns_rdatatype_maila:
case dns_rdatatype_mailb:
query_error(client, DNS_R_NOTIMP, __LINE__);
return;
case dns_rdatatype_tkey:
result = dns_tkey_processquery(client->message,
ns_g_server->tkeyctx,
client->view->dynamickeys);
if (result == ISC_R_SUCCESS)
query_send(client);
else
query_error(client, result, __LINE__);
return;
default: /* TSIG, etc. */
query_error(client, DNS_R_FORMERR, __LINE__);
return;
}
}
/*
* Turn on minimal response for (C)DNSKEY and (C)DS queries.
*/
if (qtype == dns_rdatatype_dnskey || qtype == dns_rdatatype_ds ||
qtype == dns_rdatatype_cdnskey || qtype == dns_rdatatype_cds)
{
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
} else if (qtype == dns_rdatatype_ns) {
/*
* Always turn on additional records for NS queries.
*/
client->query.attributes &= ~(NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
}
/*
* Maybe turn on minimal responses for ANY queries.
*/
if (qtype == dns_rdatatype_any &&
client->view->minimal_any && !TCP(client))
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
/*
* Turn on minimal responses for EDNS/UDP bufsize 512 queries.
*/
if (client->ednsversion >= 0 && client->udpsize <= 512U && !TCP(client))
client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
NS_QUERYATTR_NOADDITIONAL);
/*
* If the client has requested that DNSSEC checking be disabled,
* allow lookups to return pending data and instruct the resolver
* to return data before validation has completed.
*
* We don't need to set DNS_DBFIND_PENDINGOK when validation is
* disabled as there will be no pending data.
*/
if ((message->flags & DNS_MESSAGEFLAG_CD) != 0 ||
qtype == dns_rdatatype_rrsig)
{
client->query.dboptions |= DNS_DBFIND_PENDINGOK;
client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
} else if (!client->view->enablevalidation)
client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
/*
* Allow glue NS records to be added to the authority section
* if the answer is secure.
*/
if ((message->flags & DNS_MESSAGEFLAG_CD) != 0) {
client->query.attributes &= ~NS_QUERYATTR_SECURE;
}
/*
* Set NS_CLIENTATTR_WANTAD if the client has set AD in the query.
* This allows AD to be returned on queries without DO set.
*/
if ((message->flags & DNS_MESSAGEFLAG_AD) != 0)
client->attributes |= NS_CLIENTATTR_WANTAD;
/*
* This is an ordinary query.
*/
result = dns_message_reply(message, true);
if (result != ISC_R_SUCCESS) {
query_next(client, result);
return;
}
/*
* Assume authoritative response until it is known to be
* otherwise.
*
* If "-T noaa" has been set on the command line don't set
* AA on authoritative answers.
*/
if (!ns_g_noaa)
message->flags |= DNS_MESSAGEFLAG_AA;
/*
* Set AD. We must clear it if we add non-validated data to a
* response.
*/
if (WANTDNSSEC(client) || WANTAD(client))
message->flags |= DNS_MESSAGEFLAG_AD;
qclient = NULL;
ns_client_attach(client, &qclient);
(void)query_find(qclient, NULL, qtype);
}