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bind/lib/ns/query.c

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/*
* Copyright (C) 2017 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 http://mozilla.org/MPL/2.0/.
*/
/*! \file */
#include <config.h>
#include <string.h>
#include <isc/hex.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/random.h>
#include <isc/rwlock.h>
#include <isc/serial.h>
#include <isc/stats.h>
#include <isc/string.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/dnsrps.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/message.h>
#include <dns/ncache.h>
#include <dns/nsec.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/types.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <dns/zt.h>
#include <ns/client.h>
#include <ns/interfacemgr.h>
#include <ns/log.h>
#include <ns/server.h>
#include <ns/sortlist.h>
#include <ns/stats.h>
#include <ns/xfrout.h>
#include "hooks.h"
#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
/*%
* Maximum number of chained queries before we give up
* to prevent CNAME loops.
*/
#define MAX_RESTARTS 16
#define QUERY_ERROR(qctx, r) \
do { \
qctx->result = r; \
qctx->want_restart = ISC_FALSE; \
qctx->line = __LINE__; \
} while (0)
#define RECURSE_ERROR(qctx, r) \
do { \
if ((r) == DNS_R_DUPLICATE || (r) == DNS_R_DROP) \
QUERY_ERROR(qctx, r); \
else \
QUERY_ERROR(qctx, DNS_R_SERVFAIL); \
} while (0)
/*% 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)
/*% Client presented a CLIENT-SUBNET option. */
#define HAVEECS(c) (((c)->attributes & \
NS_CLIENTATTR_HAVEECS) != 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)
/*% Does the rdataset 'r' have an attached 'No QNAME Proof'? */
#define NOQNAME(r) (((r)->attributes & \
DNS_RDATASETATTR_NOQNAME) != 0)
/*% Does the rdataset 'r' contains a stale answer? */
#define STALE(r) (((r)->attributes & \
DNS_RDATASETATTR_STALE) != 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_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_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_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)
#define CCTRACE(l,m) client_trace(qctx->client, l, m)
#else
#define CTRACE(l,m) ((void)m)
#define CCTRACE(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)
static isc_boolean_t
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, isc_boolean_t 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 isc_boolean_t
rpz_ck_dnssec(ns_client_t *client, isc_result_t qresult,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
static void
log_noexistnodata(void *val, int level, const char *fmt, ...)
ISC_FORMAT_PRINTF(3, 4);
#ifdef NS_HOOKS_ENABLE
LIBNS_EXTERNAL_DATA ns_hook_t *ns__hook_table = NULL;
#define PROCESS_HOOK(...) \
NS_PROCESS_HOOK(ns__hook_table, __VA_ARGS__)
#define PROCESS_HOOK_VOID(...) \
NS_PROCESS_HOOK_VOID(ns__hook_table, __VA_ARGS__)
#else
#define PROCESS_HOOK(...) do {} while (0)
#define PROCESS_HOOK_VOID(...) do {} while (0)
#endif
/*
* The functions defined below implement the query logic that previously lived
* in the single very complex function query_find(). The query_ctx_t structure
* defined in <ns/query.h> maintains state from function to function. The call
* flow for the general query processing algorithm is described below:
*
* 1. Set up query context and other resources for a client
* query (query_setup())
*
* 2. Start the search (ns__query_start())
*
* 3. Identify authoritative data sources which may have an answer;
* search them (query_lookup()). If an answer is found, go to 7.
*
* 4. If recursion or cache access are allowed, search the cache
* (query_lookup() again, using the cache database) to find a better
* answer. If an answer is found, go to 7.
*
* 5. If recursion is allowed, begin recursion (query_recurse()).
* Go to 15 to clean up this phase of the query. When recursion
* is complete, processing will resume at 6.
*
* 6. Resume from recursion; set up query context for resumed processing.
*
* 7. Determine what sort of answer we've found (query_gotanswer())
* and call other functions accordingly:
* - not found (auth or cache), go to 8
* - delegation, go to 9
* - no such domain (auth), go to 10
* - empty answer (auth), go to 11
* - negative response (cache), go to 12
* - answer found, go to 13
*
* 8. The answer was not found in the database (query_notfound().
* Set up a referral and go to 9.
*
* 9. Handle a delegation response (query_delegation()). If we are
* allowed to recurse, go to 5, otherwise go to 15 to clean up and
* return the delegation to the client.
*
* 10. No such domain (query_nxdomain()). Attempt redirection; if
* unsuccessful, add authority section records (query_addsoa(),
* query_addauth()), then go to 15 to return NXDOMAIN to client.
*
* 11. Empty answer (query_nodata()). Add authority section records
* (query_addsoa(), query_addauth()) and signatures if authoritative
* (query_sign_nodata()) then go to 15 and return
* NOERROR/ANCOUNT=0 to client.
*
* 12. No such domain or empty answer returned from cache (query_ncache()).
* Set response code appropriately, go to 11.
*
* 13. Prepare a response (query_prepresponse()) and then fill it
* appropriately (query_respond(), or for type ANY,
* query_respond_any()).
*
* 14. If a restart is needed due to CNAME/DNAME chaining, go to 2.
*
* 15. Clean up resources. If recursing, stop and wait for the event
* handler to be called back (step 6). If an answer is ready,
* return it to the client.
*
* (XXX: This description omits several special cases including
* DNS64, filter-aaaa, RPZ, RRL, and the SERVFAIL cache.)
*/
static void
query_trace(query_ctx_t *qctx);
static void
qctx_init(ns_client_t *client, dns_fetchevent_t *event,
dns_rdatatype_t qtype, query_ctx_t *qctx);
static isc_result_t
query_setup(ns_client_t *client, dns_rdatatype_t qtype);
static isc_result_t
query_lookup(query_ctx_t *qctx);
static void
fetch_callback(isc_task_t *task, isc_event_t *event);
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,
isc_boolean_t resuming);
static isc_result_t
query_resume(query_ctx_t *qctx);
static isc_result_t
query_checkrrl(query_ctx_t *qctx, isc_result_t result);
static isc_result_t
query_checkrpz(query_ctx_t *qctx, isc_result_t result);
static isc_result_t
query_rpzcname(query_ctx_t *qctx, dns_name_t *cname);
static isc_result_t
query_gotanswer(query_ctx_t *qctx, isc_result_t result);
static void
query_addnoqnameproof(query_ctx_t *qctx);
static isc_result_t
query_respond_any(query_ctx_t *qctx);
static isc_result_t
query_respond(query_ctx_t *qctx);
static isc_result_t
query_dns64(query_ctx_t *qctx);
static void
query_filter64(query_ctx_t *qctx);
static isc_result_t
query_notfound(query_ctx_t *qctx);
static isc_result_t
query_zone_delegation(query_ctx_t *qctx);
static isc_result_t
query_delegation(query_ctx_t *qctx);
static void
query_addds(query_ctx_t *qctx);
static isc_result_t
query_nodata(query_ctx_t *qctx, isc_result_t result);
static isc_result_t
query_sign_nodata(query_ctx_t *qctx);
static void
query_addnxrrsetnsec(query_ctx_t *qctx);
static isc_result_t
query_nxdomain(query_ctx_t *qctx, isc_boolean_t empty_wild);
static isc_result_t
query_redirect(query_ctx_t *qctx);
static isc_result_t
query_ncache(query_ctx_t *qctx, isc_result_t result);
static isc_result_t
query_coveringnsec(query_ctx_t *qctx);
static isc_result_t
query_cname(query_ctx_t *qctx);
static isc_result_t
query_dname(query_ctx_t *qctx);
static isc_result_t
query_addcname(query_ctx_t *qctx, dns_trust_t trust, dns_ttl_t ttl);
static isc_result_t
query_prepresponse(query_ctx_t *qctx);
static isc_result_t
query_addsoa(query_ctx_t *qctx, unsigned int override_ttl,
dns_section_t section);
static isc_result_t
query_addns(query_ctx_t *qctx);
static void
query_addbestns(query_ctx_t *qctx);
static void
query_addwildcardproof(query_ctx_t *qctx, isc_boolean_t ispositive,
isc_boolean_t nodata);
static void
query_addauth(query_ctx_t *qctx);
static isc_result_t
query_done(query_ctx_t *qctx);
/*%
* 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;
ns_stats_increment(client->sctx->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 == ns_statscounter_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, ns_statscounter_nonauthans);
else
inc_stats(client, ns_statscounter_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 = ns_statscounter_referral;
else
counter = ns_statscounter_nxrrset;
} else
counter = ns_statscounter_success;
} else if (client->message->rcode == dns_rcode_nxdomain)
counter = ns_statscounter_nxdomain;
else if (client->message->rcode == dns_rcode_badcookie)
counter = ns_statscounter_badcookie;
else /* We end up here in case of YXDOMAIN, and maybe others */
counter = ns_statscounter_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, ns_statscounter_servfail);
break;
case DNS_R_FORMERR:
inc_stats(client, ns_statscounter_formerr);
break;
default:
inc_stats(client, ns_statscounter_failure);
break;
}
if ((client->sctx->options & NS_SERVER_LOGQUERIES) != 0)
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, ns_statscounter_duplicate);
else if (result == DNS_R_DROP)
inc_stats(client, ns_statscounter_dropped);
else
inc_stats(client, ns_statscounter_failure);
ns_client_next(client, result);
}
static inline void
query_freefreeversions(ns_client_t *client, isc_boolean_t 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, isc_boolean_t 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,
ISC_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(isc_boolean_t));
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 = ISC_FALSE;
if (client->query.rpz_st != NULL) {
rpz_st_clear(client);
if (everything) {
INSIST(client->query.rpz_st->rpsdb == NULL);
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 = ISC_FALSE;
client->query.isreferral = ISC_FALSE;
client->query.dns64_options = 0;
client->query.dns64_ttl = ISC_UINT32_MAX;
}
static void
query_next_callback(ns_client_t *client) {
query_reset(client, ISC_FALSE);
}
void
ns_query_free(ns_client_t *client) {
REQUIRE(NS_CLIENT_VALID(client));
query_reset(client, ISC_TRUE);
}
/*%
* Allocate a name buffer.
*/
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");
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);
}
/*%
* Get a name buffer from the pool, or allocate a new one if needed.
*/
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 = ISC_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 = ISC_FALSE;
client->query.isreferral = ISC_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 = ISC_FALSE;
client->query.redirect.is_zone = ISC_FALSE;
dns_fixedname_init(&client->query.redirect.fixed);
client->query.redirect.fname =
dns_fixedname_name(&client->query.redirect.fixed);
query_reset(client, ISC_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, ISC_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 = ISC_FALSE;
dbversion->queryok = ISC_FALSE;
ISC_LIST_APPEND(client->query.activeversions,
dbversion, link);
}
return (dbversion);
}
static inline isc_result_t
query_validatezonedb(ns_client_t *client, const 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->query.rpz_st == NULL &&
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 = ISC_TRUE;
if ((client->query.attributes &
NS_QUERYATTR_QUERYOK) == 0) {
dbversion->queryok = ISC_FALSE;
return (DNS_R_REFUSED);
}
dbversion->queryok = ISC_TRUE;
goto approved;
}
}
result = ns_client_checkaclsilent(client, NULL, queryacl, ISC_TRUE);
if ((options & DNS_GETDB_NOLOG) == 0) {
char msg[NS_CLIENT_ACLMSGSIZE("query")];
if (result == ISC_R_SUCCESS) {
if (isc_log_wouldlog(ns_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, ISC_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 = ISC_TRUE;
if (result != ISC_R_SUCCESS) {
dbversion->queryok = ISC_FALSE;
return (DNS_R_REFUSED);
}
dbversion->queryok = ISC_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, const 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;
isc_boolean_t partial = ISC_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 = ISC_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, isc_boolean_t 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)
{
isc_stats_t *zonestats;
char qname_buf[DNS_NAME_FORMATSIZE];
char p_name_buf[DNS_NAME_FORMATSIZE];
char cname_buf[DNS_NAME_FORMATSIZE] = { 0 };
const char *s1 = cname_buf, *s2 = cname_buf;
dns_rpz_st_t *st;
/*
* Count enabled rewrites in the global counter.
* Count both enabled and disabled rewrites for each zone.
*/
if (!disabled && policy != DNS_RPZ_POLICY_PASSTHRU) {
ns_stats_increment(client->sctx->nsstats,
ns_statscounter_rpz_rewrites);
}
if (p_zone != NULL) {
zonestats = dns_zone_getrequeststats(p_zone);
if (zonestats != NULL)
isc_stats_increment(zonestats,
ns_statscounter_rpz_rewrites);
}
if (!isc_log_wouldlog(ns_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 = ")";
}
ns_client_log(client, DNS_LOGCATEGORY_RPZ, NS_LOGMODULE_QUERY,
DNS_RPZ_INFO_LEVEL, "%srpz %s %s rewrite %s via %s%s%s%s",
disabled ? "disabled " : "",
dns_rpz_type2str(type), dns_rpz_policy2str(policy),
qname_buf, 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, *via, *slash, *str_blank;
const char *rpztypestr1;
const char *rpztypestr2;
if (!isc_log_wouldlog(ns_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_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, const dns_name_t *name,
dns_rdatatype_t qtype, dns_db_t **dbp, unsigned int options)
{
isc_result_t result;
isc_boolean_t 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 = ISC_FALSE;
if ((client->query.attributes & NS_QUERYATTR_CACHEACLOK) == 0)
goto refuse;
} else {
/*
* We haven't evaluated the view's queryacl yet.
*/
check_acl = ISC_TRUE;
}
if (check_acl) {
isc_boolean_t log = ISC_TF((options & DNS_GETDB_NOLOG) == 0);
char msg[NS_CLIENT_ACLMSGSIZE("query (cache)")];
result = ns_client_checkaclsilent(client, NULL,
client->view->cacheacl,
ISC_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_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, isc_boolean_t *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 = ISC_TRUE;
} else if (result == ISC_R_NOTFOUND) {
result = query_getcachedb(client, name, qtype, dbp, options);
*is_zonep = ISC_FALSE;
}
return (result);
}
static inline isc_boolean_t
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 (ISC_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 (ISC_FALSE);
}
static isc_result_t
query_addadditional(void *arg, const 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;
ns_dbversion_t *dbversion;
dns_dbversion_t *version;
isc_boolean_t added_something, need_addname;
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 = ISC_FALSE;
need_addname = ISC_FALSE;
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;
}
/*
* If we want only minimal responses and are here, then it must
* be for glue.
*/
if (client->view->minimalresponses == dns_minimal_yes)
goto try_glue;
/*
* Look within the same zone database for authoritative
* additional data.
*/
if (!client->query.authdbset || client->query.authdb == NULL)
goto try_cache;
dbversion = query_findversion(client, client->query.authdb);
if (dbversion == NULL)
goto try_cache;
dns_db_attach(client->query.authdb, &db);
version = dbversion->version;
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.
*/
node = NULL;
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:
if (!client->view->recursion)
goto try_glue;
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;
}
version = NULL;
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;
dbversion = query_findversion(client, client->query.gluedb);
if (dbversion == NULL)
goto cleanup;
dns_db_attach(client->query.gluedb, &db);
version = dbversion->version;
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 = ISC_TRUE;
ISC_LIST_APPEND(fname->list, rdataset, link);
trdataset = rdataset;
rdataset = NULL;
added_something = ISC_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
isc_boolean_t have_a = ISC_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;
} else if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (result == ISC_R_SUCCESS) {
mname = NULL;
#ifdef ALLOW_FILTER_AAAA
have_a = ISC_TRUE;
#endif
if (additionaltype == dns_rdatasetadditional_fromcache &&
(DNS_TRUST_PENDING(rdataset->trust) ||
DNS_TRUST_GLUE(rdataset->trust)) &&
!validate(client, db, fname, rdataset, sigrdataset))
{
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 = ISC_TRUE;
}
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = ISC_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;
} else if (result == DNS_R_NCACHENXRRSET) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
dns_rdataset_disassociate(sigrdataset);
} else if (result == ISC_R_SUCCESS) {
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(client, db, fname, rdataset, sigrdataset))
{
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 = ISC_TRUE;
}
ISC_LIST_APPEND(fname->list, rdataset, link);
added_something = ISC_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 ISC_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);
CTRACE(ISC_LOG_DEBUG(3), "query_addadditional: done");
return (eresult);
}
static void
query_addrdataset(ns_client_t *client, dns_section_t section,
dns_name_t *fname, dns_rdataset_t *rdataset)
{
UNUSED(section);
/*
* 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;
/*
* Try to process glue directly.
*/
if (client->view->use_glue_cache &&
(rdataset->type == dns_rdatatype_ns) &&
(client->query.gluedb != NULL) &&
dns_db_iszone(client->query.gluedb))
{
isc_result_t result;
ns_dbversion_t *dbversion;
unsigned int options = 0;
dbversion = query_findversion(client, client->query.gluedb);
if (dbversion == NULL)
goto regular;
#ifdef ALLOW_FILTER_AAAA
if (client->filter_aaaa == dns_aaaa_filter ||
client->filter_aaaa == dns_aaaa_break_dnssec)
{
options |= DNS_RDATASETADDGLUE_FILTERAAAA;
}
#endif
result = dns_rdataset_addglue(rdataset, dbversion->version,
options, client->message);
if (result == ISC_R_SUCCESS)
return;
}
regular:
/*
* Add additional data.
*
* We don't care if dns_rdataset_additionaldata() fails.
*/
(void)dns_rdataset_additionaldata(rdataset, query_addadditional,
client);
CTRACE(ISC_LOG_DEBUG(3), "query_addrdataset: 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 = *namep, *mname = NULL;
dns_rdataset_t *rdataset = *rdatasetp, *mrdataset = NULL;
dns_rdataset_t *sigrdataset = NULL;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "query_addrrset");
if (sigrdatasetp != NULL)
sigrdataset = *sigrdatasetp;
/*%
* 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.
*/
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, section, 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");
}
/*
* 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, ISC_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 ISC_FALSE if we have exhausted all the possible keys.
*/
static isc_boolean_t
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;
isc_boolean_t secure = ISC_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, ISC_FALSE,
&cm, &ci, &node);
if (result != ISC_R_SUCCESS)
return (ISC_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 (ISC_FALSE);
if (keyrdataset->trust != dns_trust_secure)
return (ISC_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 = ISC_TRUE;
break;
}
dst_key_free(keyp);
}
return (secure);
}
static isc_boolean_t
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;
isc_boolean_t ignore = ISC_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 = ISC_TRUE;
goto again;
}
if (result == ISC_R_SUCCESS || result == DNS_R_FROMWILDCARD)
return (ISC_TRUE);
return (ISC_FALSE);
}
/*
* Validate the rdataset if possible with available records.
*/
static isc_boolean_t
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 (ISC_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);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
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 (ISC_TRUE);
}
dst_key_free(&key);
} while (1);
if (dns_rdataset_isassociated(&keyrdataset))
dns_rdataset_disassociate(&keyrdataset);
}
return (ISC_FALSE);
}
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
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);
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);
query_putrdataset(client, &devent->rdataset);
isc_event_free(&event);
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(&client->sctx->recursionquota,
&client->recursionquota);
if (result == ISC_R_SUCCESS && !client->mortal && !TCP(client))
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS)
return;
ns_stats_increment(client->sctx->nsstats,
ns_statscounter_recursclients);
}
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);
ns_stats_increment(client->sctx->nsstats,
ns_statscounter_prefetch);
}
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;
if (st->rpsdb != NULL) {
dns_db_detach(&st->rpsdb);
}
}
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;
#ifdef USE_DNSRPS
if (st->popt.dnsrps_enabled) {
if (st->rpsdb == NULL ||
librpz->have_trig(dns_dnsrps_type2trig(rpz_type),
ip_type == dns_rdatatype_aaaa,
((rpsdb_t *)st->rpsdb)->rsp))
{
return (DNS_RPZ_ALL_ZBITS);
}
return (0);
}
#endif
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);
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(&client->sctx->recursionquota,
&client->recursionquota);
if (result == ISC_R_SUCCESS && !client->mortal && !TCP(client))
result = ns_client_replace(client);
if (result != ISC_R_SUCCESS)
return;
ns_stats_increment(client->sctx->nsstats,
ns_statscounter_recursclients);
}
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,
isc_boolean_t resuming)
{
dns_rpz_st_t *st;
isc_boolean_t 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));
INSIST(*dbp == NULL);
st->state &= ~DNS_RPZ_RECURSING;
*dbp = st->r.db;
st->r.db = NULL;
if (*rdatasetp != NULL)
query_putrdataset(client, rdatasetp);
*rdatasetp = st->r.r_rdataset;
st->r.r_rdataset = NULL;
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 = ISC_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;
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&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);
}
/*
* 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, " concatentate()", 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, " concatentate()", 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;
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);
dns_fixedname_init(&foundf);
found = dns_fixedname_name(&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);
}
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:
*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_dname(). 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);
}
#ifdef USE_DNSRPS
/*
* Check the results of a RPZ service interface lookup.
* Stop after an error (<0) or not a hit on a disabled zone (0).
* Continue after a hit on a disabled zone (>0).
*/
static int
dnsrps_ck(librpz_emsg_t *emsg, ns_client_t *client, rpsdb_t *rpsdb,
isc_boolean_t recursed)
{
isc_region_t region;
librpz_domain_buf_t pname_buf;
if (!librpz->rsp_result(emsg, &rpsdb->result, recursed, rpsdb->rsp)) {
return (-1);
}
/*
* Forget the state from before the IP address or domain check
* if the lookup hit nothing.
*/
if (rpsdb->result.policy == LIBRPZ_POLICY_UNDEFINED ||
rpsdb->result.hit_id != rpsdb->hit_id ||
rpsdb->result.policy != LIBRPZ_POLICY_DISABLED)
{
if (!librpz->rsp_pop_discard(emsg, rpsdb->rsp)) {
return (-1);
}
return (0);
}
/*
* Log a hit on a disabled zone.
* Forget the zone to not try it again, and restore the pre-hit state.
*/
if (!librpz->rsp_domain(emsg, &pname_buf, rpsdb->rsp)) {
return (-1);
}
region.base = pname_buf.d;
region.length = pname_buf.size;
dns_name_fromregion(client->query.rpz_st->p_name, &region);
rpz_log_rewrite(client, ISC_TRUE,
dns_dnsrps_2policy(rpsdb->result.zpolicy),
dns_dnsrps_trig2type(rpsdb->result.trig), NULL,
client->query.rpz_st->p_name, NULL,
rpsdb->result.cznum);
if (!librpz->rsp_forget_zone(emsg, rpsdb->result.cznum, rpsdb->rsp) ||
!librpz->rsp_pop(emsg, &rpsdb->result, rpsdb->rsp))
{
return (-1);
}
return (1);
}
/*
* Ready the shim database and rdataset for a DNSRPS hit.
*/
static isc_boolean_t
dnsrps_set_p(librpz_emsg_t *emsg, ns_client_t *client, dns_rpz_st_t *st,
dns_rdatatype_t qtype, dns_rdataset_t **p_rdatasetp,
isc_boolean_t recursed)
{
rpsdb_t *rpsdb;
librpz_domain_buf_t pname_buf;
isc_region_t region;
dns_zone_t *p_zone;
dns_db_t *p_db;
dns_dbnode_t *p_node;
dns_rpz_policy_t policy;
dns_fixedname_t foundf;
dns_name_t *found;
dns_rdatatype_t foundtype, searchtype;
isc_result_t result;
rpsdb = (rpsdb_t *)st->rpsdb;
if (!librpz->rsp_result(emsg, &rpsdb->result, recursed, rpsdb->rsp)) {
return (ISC_FALSE);
}
if (rpsdb->result.policy == LIBRPZ_POLICY_UNDEFINED) {
return (ISC_TRUE);
}
/*
* Give the fake or shim DNSRPS database its new origin.
*/
if (!librpz->rsp_soa(emsg, NULL, NULL, &rpsdb->origin_buf,
&rpsdb->result, rpsdb->rsp))
{
return (ISC_FALSE);
}
region.base = rpsdb->origin_buf.d;
region.length = rpsdb->origin_buf.size;
dns_name_fromregion(&rpsdb->common.origin, &region);
if (!librpz->rsp_domain(emsg, &pname_buf, rpsdb->rsp)) {
return (ISC_FALSE);
}
region.base = pname_buf.d;
region.length = pname_buf.size;
dns_name_fromregion(st->p_name, &region);
p_zone = NULL;
p_db = NULL;
p_node = NULL;
rpz_ready(client, p_rdatasetp);
dns_db_attach(st->rpsdb, &p_db);
policy = dns_dnsrps_2policy(rpsdb->result.policy);
if (policy != DNS_RPZ_POLICY_RECORD) {
result = ISC_R_SUCCESS;
} else if (qtype == dns_rdatatype_rrsig) {
/*
* dns_find_db() refuses to look for and fail to
* find dns_rdatatype_rrsig.
*/
result = DNS_R_NXRRSET;
policy = DNS_RPZ_POLICY_NODATA;
} else {
/*
* Get the next (and so first) RR from the policy node.
* If it is a CNAME, then look for it regardless of the
* query type.
*/
if (!librpz->rsp_rr(emsg, &foundtype, NULL, NULL, NULL,
&rpsdb->result, rpsdb->qname->ndata,
rpsdb->qname->length, rpsdb->rsp))
{
return (ISC_FALSE);
}
if (foundtype == dns_rdatatype_cname) {
searchtype = dns_rdatatype_cname;
} else {
searchtype = qtype;
}
/*
* Get the DNSPRS imitation rdataset.
*/
dns_fixedname_init(&foundf);
found = dns_fixedname_name(&foundf);
result = dns_db_find(p_db, st->p_name, NULL, searchtype,
0, 0, &p_node, found, *p_rdatasetp, NULL);
if (result == ISC_R_SUCCESS) {
if (searchtype == dns_rdatatype_cname &&
qtype != dns_rdatatype_cname)
{
result = DNS_R_CNAME;
}
} else if (result == DNS_R_NXRRSET) {
policy = DNS_RPZ_POLICY_NODATA;
} else {
snprintf(emsg->c, sizeof(emsg->c), "dns_db_find(): %s",
isc_result_totext(result));
return (ISC_FALSE);
}
}
rpz_save_p(st, client->view->rpzs->zones[rpsdb->result.cznum],
dns_dnsrps_trig2type(rpsdb->result.trig), policy,
st->p_name, 0, result, &p_zone, &p_db, &p_node,
p_rdatasetp, NULL);
rpz_clean(NULL, NULL, NULL, p_rdatasetp);
return (ISC_TRUE);
}
static isc_result_t
dnsrps_rewrite_ip(ns_client_t *client, const isc_netaddr_t *netaddr,
dns_rpz_type_t rpz_type, dns_rdataset_t **p_rdatasetp)
{
dns_rpz_st_t *st;
rpsdb_t *rpsdb;
librpz_trig_t trig = LIBRPZ_TRIG_CLIENT_IP;
isc_boolean_t recursed = ISC_FALSE;
int res;
librpz_emsg_t emsg;
isc_result_t result;
st = client->query.rpz_st;
rpsdb = (rpsdb_t *)st->rpsdb;
result = rpz_ready(client, p_rdatasetp);
if (result != ISC_R_SUCCESS) {
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (result);
}
switch (rpz_type) {
case DNS_RPZ_TYPE_CLIENT_IP:
trig = LIBRPZ_TRIG_CLIENT_IP;
recursed = ISC_FALSE;
break;
case DNS_RPZ_TYPE_IP:
trig = LIBRPZ_TRIG_IP;
recursed = ISC_TRUE;
break;
case DNS_RPZ_TYPE_NSIP:
trig = LIBRPZ_TRIG_NSIP;
recursed = ISC_TRUE;
break;
default:
INSIST(0);
}
do {
if (!librpz->rsp_push(&emsg, rpsdb->rsp) ||
!librpz->ck_ip(&emsg,
netaddr->family == AF_INET
? (const void *)&netaddr->type.in
: (const void *)&netaddr->type.in6,
netaddr->family, trig, ++rpsdb->hit_id,
recursed, rpsdb->rsp) ||
(res = dnsrps_ck(&emsg, client, rpsdb, recursed)) < 0)
{
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, NULL,
rpz_type, emsg.c, DNS_R_SERVFAIL);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
}
} while (res != 0);
return (ISC_R_SUCCESS);
}
static isc_result_t
dnsrps_rewrite_name(ns_client_t *client, dns_name_t *trig_name,
isc_boolean_t recursed, dns_rpz_type_t rpz_type,
dns_rdataset_t **p_rdatasetp)
{
dns_rpz_st_t *st;
rpsdb_t *rpsdb;
librpz_trig_t trig = LIBRPZ_TRIG_CLIENT_IP;
isc_region_t r;
int res;
librpz_emsg_t emsg;
isc_result_t result;
st = client->query.rpz_st;
rpsdb = (rpsdb_t *)st->rpsdb;
result = rpz_ready(client, p_rdatasetp);
if (result != ISC_R_SUCCESS) {
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (result);
}
switch (rpz_type) {
case DNS_RPZ_TYPE_QNAME:
trig = LIBRPZ_TRIG_QNAME;
break;
case DNS_RPZ_TYPE_NSDNAME:
trig = LIBRPZ_TRIG_NSDNAME;
break;
default:
INSIST(0);
}
dns_name_toregion(trig_name, &r);
do {
if (!librpz->rsp_push(&emsg, rpsdb->rsp) ||
!librpz->ck_domain(&emsg, r.base, r.length,
trig, ++rpsdb->hit_id,
recursed, rpsdb->rsp) ||
(res = dnsrps_ck(&emsg, client, rpsdb, recursed)) < 0)
{
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, NULL,
rpz_type, emsg.c, DNS_R_SERVFAIL);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (DNS_R_SERVFAIL);
}
} while (res != 0);
return (ISC_R_SUCCESS);
}
#endif /* USE_DNSRPS */
/*
* 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");
rpzs = client->view->rpzs;
st = client->query.rpz_st;
#ifdef USE_DNSRPS
if (st->popt.dnsrps_enabled) {
return (dnsrps_rewrite_ip(client, netaddr, rpz_type,
p_rdatasetp));
}
#endif
dns_fixedname_init(&ip_namef);
ip_name = dns_fixedname_name(&ip_namef);
p_zone = NULL;
p_db = NULL;
p_node = NULL;
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.
*/
dns_fixedname_init(&p_namef);
p_name = dns_fixedname_name(&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, ISC_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, isc_boolean_t 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, isc_boolean_t 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, isc_boolean_t recursed,
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;
#ifndef USE_DNSRPS
UNUSED(recursed);
#endif
CTRACE(ISC_LOG_DEBUG(3), "rpz_rewrite_name");
rpzs = client->view->rpzs;
st = client->query.rpz_st;
#ifdef USE_DNSRPS
if (st->popt.dnsrps_enabled) {
return (dnsrps_rewrite_name(client, trig_name, recursed,
rpz_type, rdatasetp));
}
#endif
zbits = rpz_get_zbits(client, qtype, rpz_type);
zbits &= allowed_zbits;
if (zbits == 0)
return (ISC_R_SUCCESS);
/*
* 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);
dns_fixedname_init(&p_namef);
p_name = dns_fixedname_name(&p_namef);
p_zone = NULL;
p_db = NULL;
p_node = NULL;
/*
* 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, ISC_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 {
qresult_type_done = 0,
qresult_type_restart = 1,
qresult_type_recurse = 2
} 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, isc_boolean_t 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;
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;
#ifdef USE_DNSRPS
librpz_emsg_t emsg;
#endif
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 && !rpzs->p.dnsrps_enabled) ||
(!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;
st->rpsdb = NULL;
}
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));
dns_fixedname_init(&st->_p_namef);
dns_fixedname_init(&st->_r_namef);
dns_fixedname_init(&st->_fnamef);
st->p_name = dns_fixedname_name(&st->_p_namef);
st->r_name = dns_fixedname_name(&st->_r_namef);
st->fname = dns_fixedname_name(&st->_fnamef);
st->have = have;
st->popt = popt;
st->rpz_ver = rpz_ver;
client->query.rpz_st = st;
if (popt.dnsrps_enabled) {
#ifdef USE_DNSRPS
if (st->rpsdb != NULL) {
dns_db_detach(&st->rpsdb);
}
result = dns_dnsrps_rewrite_init(&emsg, st, rpzs,
client->query.qname,
client->mctx,
RECURSIONOK(client));
if (result != ISC_R_SUCCESS) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
NULL, DNS_RPZ_TYPE_QNAME,
emsg.c, result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
return (ISC_R_SUCCESS);
}
#else
INSIST(0);
#endif
}
}
/*
* 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 = 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 = 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 = qresult_type_recurse;
else
qresult_type = qresult_type_restart;
break;
case ISC_R_FAILURE:
case ISC_R_TIMEDOUT:
case DNS_R_BROKENCHAIN:
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL3, NULL,
DNS_RPZ_TYPE_QNAME,
" stop on qresult in rpz_rewrite()", qresult);
return (ISC_R_SUCCESS);
default:
rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, NULL,
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 (!st->popt.dnsrps_enabled &&
qresult_type == 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) {
isc_boolean_t norec =
ISC_TF(qresult_type != qresult_type_recurse);
result = rpz_rewrite_name(client, client->query.qname,
qtype, DNS_RPZ_TYPE_QNAME,
allowed, norec,
&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 recusion is so slow.
*/
if (qresult_type == 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 == 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 == 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 addesses.
*/
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);
dns_rdata_reset(&nsrdata);
if (result != ISC_R_SUCCESS) {
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
nsname, DNS_RPZ_TYPE_NSIP,
" rdata_tostruct()", result);
st->m.policy = DNS_RPZ_POLICY_ERROR;
goto cleanup;
}
/*
* 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,
ISC_TRUE,
&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:
#ifdef USE_DNSRPS
if (st->popt.dnsrps_enabled &&
st->m.policy != DNS_RPZ_POLICY_ERROR &&
!dnsrps_set_p(&emsg, client, st, qtype, &rdataset,
ISC_TF(qresult_type != qresult_type_recurse)))
{
rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, NULL,
DNS_RPZ_TYPE_BAD, emsg.c, DNS_R_SERVFAIL);
st->m.policy = DNS_RPZ_POLICY_ERROR;
}
#endif
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, ISC_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 isc_boolean_t
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 (ISC_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 (ISC_FALSE);
if (sigrdataset == NULL)
return (ISC_TRUE);
if (dns_rdataset_isassociated(sigrdataset))
return (ISC_FALSE);
/*
* We are happy to rewrite nothing.
*/
if (rdataset == NULL || !dns_rdataset_isassociated(rdataset))
return (ISC_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 (ISC_FALSE);
/*
* Look for a signature in a negative cache rdataset.
*/
if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) == 0)
return (ISC_TRUE);
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&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 (ISC_FALSE);
}
return (ISC_TRUE);
}
/*
* 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);
}
}
#define NS_NAME_INIT(A,B) \
{ \
DNS_NAME_MAGIC, \
A, sizeof(A), sizeof(B), \
DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE, \
B, NULL, { (void *)-1, (void *)-1}, \
{NULL, NULL} \
}
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[] = {
NS_NAME_INIT(inaddr10, inaddr10_offsets),
NS_NAME_INIT(inaddr16172, inaddr172_offsets),
NS_NAME_INIT(inaddr17172, inaddr172_offsets),
NS_NAME_INIT(inaddr18172, inaddr172_offsets),
NS_NAME_INIT(inaddr19172, inaddr172_offsets),
NS_NAME_INIT(inaddr20172, inaddr172_offsets),
NS_NAME_INIT(inaddr21172, inaddr172_offsets),
NS_NAME_INIT(inaddr22172, inaddr172_offsets),
NS_NAME_INIT(inaddr23172, inaddr172_offsets),
NS_NAME_INIT(inaddr24172, inaddr172_offsets),
NS_NAME_INIT(inaddr25172, inaddr172_offsets),
NS_NAME_INIT(inaddr26172, inaddr172_offsets),
NS_NAME_INIT(inaddr27172, inaddr172_offsets),
NS_NAME_INIT(inaddr28172, inaddr172_offsets),
NS_NAME_INIT(inaddr29172, inaddr172_offsets),
NS_NAME_INIT(inaddr30172, inaddr172_offsets),
NS_NAME_INIT(inaddr31172, inaddr172_offsets),
NS_NAME_INIT(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 = NS_NAME_INIT(prisoner_data, prisoner_offsets);
static dns_name_t hostmaster = NS_NAME_INIT(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, isc_boolean_t exact,
dns_name_t *found)
{
unsigned char salt[256];
size_t salt_length;
isc_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;
isc_boolean_t 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);
dns_rdata_tostruct(&rdata, &nsec3, NULL);
dns_rdata_reset(&rdata);
optout = ISC_TF((nsec3.flags & DNS_NSEC3FLAG_OPTOUT) != 0);
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 isc_boolean_t
is_v4_client(ns_client_t *client) {
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET)
return (ISC_TRUE);
if (isc_sockaddr_pf(&client->peeraddr) == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&client->peeraddr.type.sin6.sin6_addr))
return (ISC_TRUE);
return (ISC_FALSE);
}
static isc_boolean_t
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 (ISC_TRUE);
return (ISC_FALSE);
}
#endif
static isc_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;
isc_uint32_t ttl = ISC_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 isc_boolean_t
dns64_aaaaok(ns_client_t *client, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_netaddr_t netaddr;
dns_aclenv_t *env = ns_interfacemgr_getaclenv(client->interface->mgr);
dns_dns64_t *dns64 = ISC_LIST_HEAD(client->view->dns64);
unsigned int flags = 0;
unsigned int i, count;
isc_boolean_t *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 (ISC_TRUE);
if (RECURSIONOK(client))
flags |= DNS_DNS64_RECURSIVE;
if (WANTDNSSEC(client) && sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
flags |= DNS_DNS64_DNSSEC;
count = dns_rdataset_count(rdataset);
aaaaok = isc_mem_get(client->mctx, sizeof(isc_boolean_t) * count);
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
if (dns_dns64_aaaaok(dns64, &netaddr, client->signer,
env, 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(isc_boolean_t) * count);
return (ISC_TRUE);
}
if (aaaaok != NULL)
isc_mem_put(client->mctx, aaaaok,
sizeof(isc_boolean_t) * count);
return (ISC_FALSE);
}
/*
* Look for the name and type in the redirection zone. If found update
* the arguments as appropriate. Return ISC_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);
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&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),
ISC_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, isc_boolean_t *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;
isc_boolean_t is_zone;
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);
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&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);
}
}
}
dns_fixedname_init(&fixedredirect);
redirectname = dns_fixedname_name(&fixedredirect);
if (dns_name_countlabels(name) > 1U) {
dns_name_t prefix;
unsigned int labels = dns_name_countlabels(name) - 1;
dns_name_init(&prefix, NULL);
dns_name_getlabelsequence(name, 0, labels, &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, ISC_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);
}
/*%
* Initialize query context 'qctx'. Run by query_setup() when
* first handling a client query, and by query_resume() when
* returning from recursion.
*/
static void
qctx_init(ns_client_t *client, dns_fetchevent_t *event,
dns_rdatatype_t qtype, query_ctx_t *qctx)
{
REQUIRE(qctx != NULL);
REQUIRE(client != NULL);
/* Set this first so CCTRACE will work */
qctx->client = client;
CCTRACE(ISC_LOG_DEBUG(3), "qctx_create");
qctx->event = event;
qctx->qtype = qctx->type = qtype;
qctx->result = ISC_R_SUCCESS;
qctx->fname = NULL;
qctx->zfname = NULL;
qctx->rdataset = NULL;
qctx->zrdataset = NULL;
qctx->sigrdataset = NULL;
qctx->zsigrdataset = NULL;
qctx->zversion = NULL;
qctx->node = NULL;
qctx->db = NULL;
qctx->zdb = NULL;
qctx->version = NULL;
qctx->zone = NULL;
qctx->need_wildcardproof = ISC_FALSE;
qctx->redirected = ISC_FALSE;
qctx->dns64_exclude = qctx->dns64 = qctx->rpz = ISC_FALSE;
qctx->options = 0;
qctx->resuming = ISC_FALSE;
qctx->is_zone = ISC_FALSE;
qctx->findcoveringnsec = client->view->synthfromdnssec;
qctx->is_staticstub_zone = ISC_FALSE;
qctx->nxrewrite = ISC_FALSE;
qctx->want_stale = ISC_FALSE;
qctx->authoritative = ISC_FALSE;
}
/*%
* Clean up and disassociate the rdataset and node pointers in qctx.
*/
static void
qctx_clean(query_ctx_t *qctx) {
if (qctx->rdataset != NULL &&
dns_rdataset_isassociated(qctx->rdataset))
{
dns_rdataset_disassociate(qctx->rdataset);
}
if (qctx->sigrdataset != NULL &&
dns_rdataset_isassociated(qctx->sigrdataset))
{
dns_rdataset_disassociate(qctx->sigrdataset);
}
if (qctx->db != NULL && qctx->node != NULL) {
dns_db_detachnode(qctx->db, &qctx->node);
}
}
/*%
* Free any allocated memory associated with qctx.
*/
static void
qctx_freedata(query_ctx_t *qctx) {
if (qctx->rdataset != NULL) {
query_putrdataset(qctx->client, &qctx->rdataset);
}
if (qctx->sigrdataset != NULL) {
query_putrdataset(qctx->client, &qctx->sigrdataset);
}
if (qctx->fname != NULL) {
query_releasename(qctx->client, &qctx->fname);
}
if (qctx->db != NULL) {
dns_db_detach(&qctx->db);
}
if (qctx->zone != NULL) {
dns_zone_detach(&qctx->zone);
}
if (qctx->zdb != NULL) {
query_putrdataset(qctx->client, &qctx->zrdataset);
if (qctx->zsigrdataset != NULL)
query_putrdataset(qctx->client, &qctx->zsigrdataset);
if (qctx->zfname != NULL)
query_releasename(qctx->client, &qctx->zfname);
dns_db_detach(&qctx->zdb);
}
if (qctx->event != NULL) {
isc_event_free(ISC_EVENT_PTR(&qctx->event));
}
}
/*%
* Log detailed information about the query immediately after
* the client request or a return from recursion.
*/
static void
query_trace(query_ctx_t *qctx) {
#ifdef WANT_QUERYTRACE
char mbuf[BUFSIZ];
char qbuf[DNS_NAME_FORMATSIZE];
if (qctx->client->query.origqname != NULL)
dns_name_format(qctx->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:%d, "
"origqname:%s, timer:%d, authdb:%d, referral:%d",
qctx->client->attributes,
qctx->client->query.attributes,
qctx->client->query.restarts, qbuf,
(int) qctx->client->query.timerset,
(int) qctx->client->query.authdbset,
(int) qctx->client->query.isreferral);
CCTRACE(ISC_LOG_DEBUG(3), mbuf);
#else
UNUSED(qctx);
#endif
}
/*
* Set up query processing for the current query of 'client'.
* Calls qctx_init() to initialize a query context, checks
* the SERVFAIL cache, then hands off processing to ns__query_start().
*
* This is called only from ns_query_start(), to begin a query
* for the first time. Restarting an existing query (for
* instance, to handle CNAME lookups), is done by calling
* ns__query_start() again with the same query context. Resuming from
* recursion is handled by query_resume().
*/
static isc_result_t
query_setup(ns_client_t *client, dns_rdatatype_t qtype) {
isc_result_t result;
query_ctx_t qctx;
qctx_init(client, NULL, qtype, &qctx);
query_trace(&qctx);
/*
* If it's a SIG query, we'll iterate the node.
*/
if (qctx.qtype == dns_rdatatype_rrsig ||
qctx.qtype == dns_rdatatype_sig)
{
qctx.type = dns_rdatatype_any;
}
PROCESS_HOOK(NS_QUERY_SETUP_QCTX_INITIALIZED, &qctx);
/*
* Check SERVFAIL cache
*/
result = ns__query_sfcache(&qctx);
if (result != ISC_R_COMPLETE) {
return (result);
}
return (ns__query_start(&qctx));
}
/*%
* Starting point for a client query or a chaining query.
*
* Called first by query_setup(), and then again as often as needed to
* follow a CNAME chain. Determines which authoritative database to
* search, then hands off processing to query_lookup().
*/
isc_result_t
ns__query_start(query_ctx_t *qctx) {
isc_result_t result;
CCTRACE(ISC_LOG_DEBUG(3), "ns__query_start");
qctx->want_restart = ISC_FALSE;
qctx->authoritative = ISC_FALSE;
qctx->version = NULL;
qctx->zversion = NULL;
qctx->need_wildcardproof = ISC_FALSE;
qctx->rpz = ISC_FALSE;
if (qctx->client->view->checknames &&
!dns_rdata_checkowner(qctx->client->query.qname,
qctx->client->message->rdclass,
qctx->qtype, ISC_FALSE))
{
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
dns_name_format(qctx->client->query.qname,
namebuf, sizeof(namebuf));
dns_rdatatype_format(qctx->qtype, typename, sizeof(typename));
dns_rdataclass_format(qctx->client->message->rdclass,
classname, sizeof(classname));
ns_client_log(qctx->client, DNS_LOGCATEGORY_SECURITY,
NS_LOGMODULE_QUERY, ISC_LOG_ERROR,
"check-names failure %s/%s/%s", namebuf,
typename, classname);
QUERY_ERROR(qctx, DNS_R_REFUSED);
return (query_done(qctx));
}
/*
* First we must find the right database.
*/
qctx->options &= DNS_GETDB_NOLOG; /* Preserve DNS_GETDB_NOLOG. */
if (dns_rdatatype_atparent(qctx->qtype) &&
!dns_name_equal(qctx->client->query.qname, dns_rootname))
{
/*
* If authoritative data for this QTYPE is supposed to live in
* the parent zone, do not look for an exact match for QNAME,
* but rather for its containing zone (unless the QNAME is
* root).
*/
qctx->options |= DNS_GETDB_NOEXACT;
}
result = query_getdb(qctx->client, qctx->client->query.qname,
qctx->qtype, qctx->options, &qctx->zone,
&qctx->db, &qctx->version, &qctx->is_zone);
if (ISC_UNLIKELY((result != ISC_R_SUCCESS || !qctx->is_zone) &&
qctx->qtype == dns_rdatatype_ds &&
!RECURSIONOK(qctx->client) &&
(qctx->options & DNS_GETDB_NOEXACT) != 0))
{
/*
* This is a non-recursive QTYPE=DS query with QNAME whose
* parent we are not authoritative for. Check whether we are
* authoritative for QNAME, because if so, we need to send a
* "no data" response as required by RFC 4035, section 3.1.4.1.
*/
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
isc_result_t tresult;
tresult = query_getzonedb(qctx->client,
qctx->client->query.qname,
qctx->qtype,
DNS_GETDB_PARTIAL,
&tzone, &tdb, &tversion);
if (tresult == ISC_R_SUCCESS) {
/*
* We are authoritative for QNAME. Attach the relevant
* zone to query context, set result to ISC_R_SUCCESS.
*/
qctx->options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(qctx->client, &qctx->rdataset);
if (qctx->db != NULL) {
dns_db_detach(&qctx->db);
}
if (qctx->zone != NULL) {
dns_zone_detach(&qctx->zone);
}
qctx->version = NULL;
RESTORE(qctx->version, tversion);
RESTORE(qctx->db, tdb);
RESTORE(qctx->zone, tzone);
qctx->is_zone = ISC_TRUE;
result = ISC_R_SUCCESS;
} else {
/*
* We are not authoritative for QNAME. Clean up and
* leave result as it was.
*/
if (tdb != NULL) {
dns_db_detach(&tdb);
}
if (tzone != NULL) {
dns_zone_detach(&tzone);
}
}
}
/*
* If we did not find a database from which we can answer the query,
* respond with either REFUSED or SERVFAIL, depending on what the
* result of query_getdb() was.
*/
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_REFUSED) {
if (WANTRECURSION(qctx->client)) {
inc_stats(qctx->client,
ns_statscounter_recurserej);
} else {
inc_stats(qctx->client,
ns_statscounter_authrej);
}
if (!PARTIALANSWER(qctx->client)) {
QUERY_ERROR(qctx, DNS_R_REFUSED);
}
} else {
CCTRACE(ISC_LOG_ERROR,
"ns__query_start: query_getdb failed");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
}
return (query_done(qctx));
}
/*
* We found a database from which we can answer the query. Update
* relevant query context flags if the answer is to be prepared using
* authoritative data.
*/
qctx->is_staticstub_zone = ISC_FALSE;
if (qctx->is_zone) {
qctx->authoritative = ISC_TRUE;
if (qctx->zone != NULL &&
dns_zone_gettype(qctx->zone) == dns_zone_staticstub)
{
qctx->is_staticstub_zone = ISC_TRUE;
}
}
/*
* Attach to the database which will be used to prepare the answer.
* Update query statistics.
*/
if (qctx->event == NULL && qctx->client->query.restarts == 0) {
if (qctx->is_zone) {
if (qctx->zone != NULL) {
/*
* if is_zone = true, zone = NULL then this is
* a DLZ zone. Don't attempt to attach zone.
*/
dns_zone_attach(qctx->zone,
&qctx->client->query.authzone);
}
dns_db_attach(qctx->db, &qctx->client->query.authdb);
}
qctx->client->query.authdbset = ISC_TRUE;
/* Track TCP vs UDP stats per zone */
if (TCP(qctx->client)) {
inc_stats(qctx->client, ns_statscounter_tcp);
} else {
inc_stats(qctx->client, ns_statscounter_udp);
}
}
return (query_lookup(qctx));
}
/*%
* Perform a local database lookup, in either an authoritative or
* cache database. If unable to answer, call query_done(); otherwise
* hand off processing to query_gotanswer().
*/
static isc_result_t
query_lookup(query_ctx_t *qctx) {
isc_buffer_t b;
isc_result_t result;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_name_t *rpzqname = NULL;
unsigned int dboptions;
CCTRACE(ISC_LOG_DEBUG(3), "query_lookup");
PROCESS_HOOK(NS_QUERY_LOOKUP_BEGIN, qctx);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, qctx->client, NULL);
/*
* We'll need some resources...
*/
qctx->dbuf = query_getnamebuf(qctx->client);
if (ISC_UNLIKELY(qctx->dbuf == NULL)) {
CCTRACE(ISC_LOG_ERROR,
"query_lookup: query_getnamebuf failed (2)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
qctx->fname = query_newname(qctx->client, qctx->dbuf, &b);
qctx->rdataset = query_newrdataset(qctx->client);
if (ISC_UNLIKELY(qctx->fname == NULL || qctx->rdataset == NULL)) {
CCTRACE(ISC_LOG_ERROR,
"query_lookup: query_newname failed (2)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
if ((WANTDNSSEC(qctx->client) || qctx->findcoveringnsec) &&
(!qctx->is_zone || dns_db_issecure(qctx->db)))
{
qctx->sigrdataset = query_newrdataset(qctx->client);
if (qctx->sigrdataset == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_lookup: query_newrdataset failed (2)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
}
/*
* Now look for an answer in the database.
*/
if (qctx->dns64 && qctx->rpz) {
rpzqname = qctx->client->query.rpz_st->p_name;
} else {
rpzqname = qctx->client->query.qname;
}
dboptions = qctx->client->query.dboptions;
if (!qctx->is_zone && qctx->findcoveringnsec &&
(qctx->type != dns_rdatatype_null || !dns_name_istat(rpzqname)))
dboptions |= DNS_DBFIND_COVERINGNSEC;
result = dns_db_findext(qctx->db, rpzqname, qctx->version, qctx->type,
dboptions, qctx->client->now, &qctx->node,
qctx->fname, &cm, &ci,
qctx->rdataset, qctx->sigrdataset);
/*
* Fixup fname and sigrdataset.
*/
if (qctx->dns64 && qctx->rpz) {
isc_result_t rresult;
rresult = dns_name_copy(qctx->client->query.qname,
qctx->fname, NULL);
RUNTIME_CHECK(rresult == ISC_R_SUCCESS);
if (qctx->sigrdataset != NULL &&
dns_rdataset_isassociated(qctx->sigrdataset))
{
dns_rdataset_disassociate(qctx->sigrdataset);
}
}
if (!qctx->is_zone) {
dns_cache_updatestats(qctx->client->view->cache, result);
}
if (qctx->want_stale) {
char namebuf[DNS_NAME_FORMATSIZE];
isc_boolean_t success;
qctx->client->query.dboptions &= ~DNS_DBFIND_STALEOK;
qctx->want_stale = ISC_FALSE;
if (dns_rdataset_isassociated(qctx->rdataset) &&
dns_rdataset_count(qctx->rdataset) > 0 &&
STALE(qctx->rdataset)) {
qctx->rdataset->ttl =
qctx->client->view->staleanswerttl;
success = ISC_TRUE;
} else {
success = ISC_FALSE;
}
dns_name_format(qctx->client->query.qname,
namebuf, sizeof(namebuf));
isc_log_write(ns_lctx, NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_QUERY, ISC_LOG_INFO,
"%s resolver failure, stale answer %s",
namebuf, success ? "used" : "unavailable");
if (!success) {
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
}
return (query_gotanswer(qctx, result));
}
/*
* Event handler to resume processing a query after recursion.
* If the query has timed out or been canceled or the system
* is shutting down, clean up and exit; otherwise, call
* query_resume() to continue the ongoing work.
*/
static void
fetch_callback(isc_task_t *task, isc_event_t *event) {
dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
dns_fetch_t *fetch;
ns_client_t *client;
isc_boolean_t fetch_canceled, client_shuttingdown;
isc_result_t result;
isc_logcategory_t *logcategory = NS_LOGCATEGORY_QUERY_ERRORS;
int errorloglevel;
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 = ISC_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 = ISC_TRUE;
}
UNLOCK(&client->query.fetchlock);
INSIST(client->query.fetch == NULL);
client->query.attributes &= ~NS_QUERYATTR_RECURSING;
fetch = devent->fetch;
devent->fetch = NULL;
/*
* 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) {
if (devent->node != NULL)
dns_db_detachnode(devent->db, &devent->node);
if (devent->db != NULL)
dns_db_detach(&devent->db);
query_putrdataset(client, &devent->rdataset);
if (devent->sigrdataset != NULL)
query_putrdataset(client, &devent->sigrdataset);
isc_event_free(&event);
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 {
query_ctx_t qctx;
qctx_init(client, devent, 0, &qctx);
query_trace(&qctx);
result = query_resume(&qctx);
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_lctx, errorloglevel)) {
dns_resolver_logfetch(fetch, ns_lctx,
logcategory,
NS_LOGMODULE_QUERY,
errorloglevel, ISC_FALSE);
}
}
}
dns_resolver_destroyfetch(&fetch);
}
/*%
* Prepare client for recursion, then create a resolver fetch, with
* the event callback set to fetch_callback(). Afterward we terminate
* this phase of the query, and resume with a new query context when
* recursion completes.
*/
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,
isc_boolean_t resuming)
{
isc_result_t result;
dns_rdataset_t *rdataset, *sigrdataset;
isc_sockaddr_t *peeraddr = NULL;
CTRACE(ISC_LOG_DEBUG(3), "query_recurse");
if (!resuming)
inc_stats(client, ns_statscounter_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(&client->sctx->recursionquota,
&client->recursionquota);
ns_stats_increment(client->sctx->nsstats,
ns_statscounter_recursclients);
if (result == ISC_R_SOFTQUOTA) {
static isc_stdtime_t last = 0;
isc_stdtime_t now;
isc_stdtime_get(&now);
if (now != last) {
last = now;
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"recursive-clients soft limit "
"exceeded (%d/%d/%d), "
"aborting oldest query",
client->recursionquota->used,
client->recursionquota->soft,
client->recursionquota->max);
}
ns_client_killoldestquery(client);
result = ISC_R_SUCCESS;
} else if (result == ISC_R_QUOTA) {
static isc_stdtime_t last = 0;
isc_stdtime_t now;
isc_stdtime_get(&now);
if (now != last) {
last = now;
ns_client_log(client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"no more recursive clients "
"(%d/%d/%d): %s",
client->sctx->recursionquota.used,
client->sctx->recursionquota.soft,
client->sctx->recursionquota.max,
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);
ns_stats_decrement(client->sctx->nsstats,
ns_statscounter_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 == ISC_FALSE) {
ns_client_settimeout(client, 60);
}
if (!TCP(client)) {
peeraddr = &client->peeraddr;
}
result = dns_resolver_createfetch3(client->view->resolver,
qname, qtype, qdomain, nameservers,
NULL, peeraddr, client->message->id,
client->query.fetchoptions, 0, NULL,
client->task, fetch_callback,
client, rdataset, sigrdataset,
&client->query.fetch);
if (result != ISC_R_SUCCESS) {
query_putrdataset(client, &rdataset);
if (sigrdataset != NULL) {
query_putrdataset(client, &sigrdataset);
}
}
/*
* We're now waiting for a fetch event. A client which is
* shutting down will not be destroyed until all the events
* have been received.
*/
return (result);
}
/*%
* Restores the query context after resuming from recursion, and
* continues the query processing if needed.
*/
static isc_result_t
query_resume(query_ctx_t *qctx) {
isc_result_t result;
dns_name_t *tname;
isc_buffer_t b;
#ifdef WANT_QUERYTRACE
char mbuf[BUFSIZ];
char qbuf[DNS_NAME_FORMATSIZE];
char tbuf[DNS_RDATATYPE_FORMATSIZE];
#endif
qctx->want_restart = ISC_FALSE;
qctx->rpz_st = qctx->client->query.rpz_st;
if (qctx->rpz_st != NULL &&
(qctx->rpz_st->state & DNS_RPZ_RECURSING) != 0)
{
CCTRACE(ISC_LOG_DEBUG(3), "resume from RPZ recursion");
#ifdef WANT_QUERYTRACE
{
char pbuf[DNS_NAME_FORMATSIZE] = "<unset>";
char fbuf[DNS_NAME_FORMATSIZE] = "<unset>";
if (qctx->rpz_st->r_name != NULL)
dns_name_format(qctx->rpz_st->r_name,
qbuf, sizeof(qbuf));
else
snprintf(qbuf, sizeof(qbuf),
"<unset>");
if (qctx->rpz_st->p_name != NULL)
dns_name_format(qctx->rpz_st->p_name,
pbuf, sizeof(pbuf));
if (qctx->rpz_st->fname != NULL)
dns_name_format(qctx->rpz_st->fname,
fbuf, sizeof(fbuf));
snprintf(mbuf, sizeof(mbuf) - 1,
"rpz rname:%s, pname:%s, qctx->fname:%s",
qbuf, pbuf, fbuf);
CCTRACE(ISC_LOG_DEBUG(3), mbuf);
}
#endif
qctx->is_zone = qctx->rpz_st->q.is_zone;
qctx->authoritative = qctx->rpz_st->q.authoritative;
RESTORE(qctx->zone, qctx->rpz_st->q.zone);
RESTORE(qctx->node, qctx->rpz_st->q.node);
RESTORE(qctx->db, qctx->rpz_st->q.db);
RESTORE(qctx->rdataset, qctx->rpz_st->q.rdataset);
RESTORE(qctx->sigrdataset, qctx->rpz_st->q.sigrdataset);
qctx->qtype = qctx->rpz_st->q.qtype;
qctx->rpz_st->r.db = qctx->event->db;
if (qctx->event->node != NULL)
dns_db_detachnode(qctx->event->db, &qctx->event->node);
qctx->rpz_st->r.r_type = qctx->event->qtype;
qctx->rpz_st->r.r_rdataset = qctx->event->rdataset;
query_putrdataset(qctx->client, &qctx->event->sigrdataset);
} else if (REDIRECT(qctx->client)) {
/*
* Restore saved state.
*/
CCTRACE(ISC_LOG_DEBUG(3),
"resume from redirect recursion");
#ifdef WANT_QUERYTRACE
dns_name_format(qctx->client->query.redirect.fname,
qbuf, sizeof(qbuf));
dns_rdatatype_format(qctx->client->query.redirect.qtype,
tbuf, sizeof(tbuf));
snprintf(mbuf, sizeof(mbuf) - 1,
"redirect qctx->fname:%s, qtype:%s, auth:%d",
qbuf, tbuf,
qctx->client->query.redirect.authoritative);
CCTRACE(ISC_LOG_DEBUG(3), mbuf);
#endif
qctx->qtype = qctx->client->query.redirect.qtype;
INSIST(qctx->client->query.redirect.rdataset != NULL);
RESTORE(qctx->rdataset, qctx->client->query.redirect.rdataset);
RESTORE(qctx->sigrdataset,
qctx->client->query.redirect.sigrdataset);
RESTORE(qctx->db, qctx->client->query.redirect.db);
RESTORE(qctx->node, qctx->client->query.redirect.node);
RESTORE(qctx->zone, qctx->client->query.redirect.zone);
qctx->authoritative =
qctx->client->query.redirect.authoritative;
qctx->is_zone = qctx->client->query.redirect.is_zone;
/*
* Free resources used while recursing.
*/
query_putrdataset(qctx->client, &qctx->event->rdataset);
query_putrdataset(qctx->client, &qctx->event->sigrdataset);
if (qctx->event->node != NULL)
dns_db_detachnode(qctx->event->db, &qctx->event->node);
if (qctx->event->db != NULL)
dns_db_detach(&qctx->event->db);
} else {
CCTRACE(ISC_LOG_DEBUG(3),
"resume from normal recursion");
qctx->authoritative = ISC_FALSE;
qctx->qtype = qctx->event->qtype;
qctx->db = qctx->event->db;
qctx->node = qctx->event->node;
qctx->rdataset = qctx->event->rdataset;
qctx->sigrdataset = qctx->event->sigrdataset;
}
INSIST(qctx->rdataset != NULL);
if (qctx->qtype == dns_rdatatype_rrsig ||
qctx->qtype == dns_rdatatype_sig)
{
qctx->type = dns_rdatatype_any;
} else {
qctx->type = qctx->qtype;
}
if (DNS64(qctx->client)) {
qctx->client->query.attributes &= ~NS_QUERYATTR_DNS64;
qctx->dns64 = ISC_TRUE;
}
if (DNS64EXCLUDE(qctx->client)) {
qctx->client->query.attributes &= ~NS_QUERYATTR_DNS64EXCLUDE;
qctx->dns64_exclude = ISC_TRUE;
}
if (qctx->rpz_st != NULL &&
(qctx->rpz_st->state & DNS_RPZ_RECURSING) != 0)
{
/*
* Has response policy changed out from under us?
*/
if (qctx->rpz_st->rpz_ver != qctx->client->view->rpzs->rpz_ver)
{
ns_client_log(qctx->client, NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
DNS_RPZ_INFO_LEVEL,
"query_resume: RPZ settings "
"out of date "
"(rpz_ver %d, expected %d)",
qctx->client->view->rpzs->rpz_ver,
qctx->rpz_st->rpz_ver);
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
}
/*
* We'll need some resources...
*/
qctx->dbuf = query_getnamebuf(qctx->client);
if (qctx->dbuf == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_resume: query_getnamebuf failed (1)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
qctx->fname = query_newname(qctx->client, qctx->dbuf, &b);
if (qctx->fname == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_resume: query_newname failed (1)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
if (qctx->rpz_st != NULL &&
(qctx->rpz_st->state & DNS_RPZ_RECURSING) != 0) {
tname = qctx->rpz_st->fname;
} else if (REDIRECT(qctx->client)) {
tname = qctx->client->query.redirect.fname;
} else {
tname = dns_fixedname_name(&qctx->event->foundname);
}
result = dns_name_copy(tname, qctx->fname, NULL);
if (result != ISC_R_SUCCESS) {
CCTRACE(ISC_LOG_ERROR,
"query_resume: dns_name_copy failed");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
if (qctx->rpz_st != NULL &&
(qctx->rpz_st->state & DNS_RPZ_RECURSING) != 0) {
qctx->rpz_st->r.r_result = qctx->event->result;
result = qctx->rpz_st->q.result;
isc_event_free(ISC_EVENT_PTR(&qctx->event));
} else if (REDIRECT(qctx->client)) {
result = qctx->client->query.redirect.result;
qctx->is_zone = qctx->client->query.redirect.is_zone;
} else {
result = qctx->event->result;
}
qctx->resuming = ISC_TRUE;
return (query_gotanswer(qctx, result));
}
/*%
* If the query is recursive, check the SERVFAIL cache to see whether
* identical queries have failed recently. If we find a match, and it was
* from a query with CD=1, *or* if the current query has CD=0, then we just
* return SERVFAIL again. This prevents a validation failure from eliciting a
* SERVFAIL response to a CD=1 query.
*/
isc_result_t
ns__query_sfcache(query_ctx_t *qctx) {
isc_boolean_t failcache;
isc_uint32_t flags;
/*
* The SERVFAIL cache doesn't apply to authoritative queries.
*/
if (!RECURSIONOK(qctx->client)) {
return (ISC_R_COMPLETE);
}
flags = 0;
#ifdef ENABLE_AFL
if (qctx->client->sctx->fuzztype == isc_fuzz_resolver) {
failcache = ISC_FALSE;
} else {
failcache =
dns_badcache_find(qctx->client->view->failcache,
qctx->client->query.qname,
qctx->qtype, &flags,
&qctx->client->tnow);
}
#else
failcache = dns_badcache_find(qctx->client->view->failcache,
qctx->client->query.qname,
qctx->qtype, &flags,
&qctx->client->tnow);
#endif
if (failcache &&
(((flags & NS_FAILCACHE_CD) != 0) ||
((qctx->client->message->flags & DNS_MESSAGEFLAG_CD) == 0)))
{
if (isc_log_wouldlog(ns_lctx, ISC_LOG_DEBUG(1))) {
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
dns_name_format(qctx->client->query.qname,
namebuf, sizeof(namebuf));
dns_rdatatype_format(qctx->qtype, typename,
sizeof(typename));
ns_client_log(qctx->client,
NS_LOGCATEGORY_CLIENT,
NS_LOGMODULE_QUERY,
ISC_LOG_DEBUG(1),
"servfail cache hit %s/%s (%s)",
namebuf, typename,
((flags & NS_FAILCACHE_CD) != 0)
? "CD=1"
: "CD=0");
}
qctx->client->attributes |= NS_CLIENTATTR_NOSETFC;
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
return (ISC_R_COMPLETE);
}
/*%
* Handle response rate limiting (RRL).
*/
static isc_result_t
query_checkrrl(query_ctx_t *qctx, isc_result_t result) {
/*
* 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 (qctx->client->view->rrl != NULL &&
!HAVECOOKIE(qctx->client) &&
((qctx->fname != NULL && dns_name_isabsolute(qctx->fname)) ||
(result == ISC_R_NOTFOUND && !RECURSIONOK(qctx->client))) &&
!(result == DNS_R_DELEGATION &&
!qctx->is_zone && RECURSIONOK(qctx->client)) &&
(qctx->client->query.rpz_st == NULL ||
(qctx->client->query.rpz_st->state & DNS_RPZ_REWRITTEN) == 0) &&
(qctx->client->query.attributes & NS_QUERYATTR_RRL_CHECKED) == 0)
{
dns_rdataset_t nc_rdataset;
isc_boolean_t wouldlog;
dns_fixedname_t fixed;
const dns_name_t *constname;
char log_buf[DNS_RRL_LOG_BUF_LEN];
isc_result_t nc_result, resp_result;
dns_rrl_result_t rrl_result;
qctx->client->query.attributes |= NS_QUERYATTR_RRL_CHECKED;
wouldlog = isc_log_wouldlog(ns_lctx, DNS_RRL_LOG_DROP);
constname = qctx->fname;
if (result == DNS_R_NXDOMAIN) {
/*
* Use the database origin name to rate limit NXDOMAIN
*/
if (qctx->db != NULL)
constname = dns_db_origin(qctx->db);
resp_result = result;
} else if (result == DNS_R_NCACHENXDOMAIN &&
qctx->rdataset != NULL &&
dns_rdataset_isassociated(qctx->rdataset) &&
(qctx->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(qctx->rdataset);
nc_result == ISC_R_SUCCESS;
nc_result = dns_rdataset_next(qctx->rdataset))
{
dns_ncache_current(qctx->rdataset,
dns_fixedname_name(&fixed),
&nc_rdataset);
if (nc_rdataset.type == dns_rdatatype_soa) {
dns_rdataset_disassociate(&nc_rdataset);
constname = 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".
*/
constname = dns_rootname;
resp_result = DNS_R_DELEGATION;
} else {
resp_result = ISC_R_SUCCESS;
}
rrl_result = dns_rrl(qctx->client->view,
&qctx->client->peeraddr,
TCP(qctx->client),
qctx->client->message->rdclass,
qctx->qtype, constname,
resp_result, qctx->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(qctx->client, DNS_LOGCATEGORY_RRL,
NS_LOGMODULE_QUERY,
DNS_RRL_LOG_DROP,
"%s", log_buf);
}
if (!qctx->client->view->rrl->log_only) {
if (rrl_result == DNS_RRL_RESULT_DROP) {
/*
* These will also be counted in
* ns_statscounter_dropped
*/
inc_stats(qctx->client,
ns_statscounter_ratedropped);
QUERY_ERROR(qctx, DNS_R_DROP);
} else {
/*
* These will also be counted in
* ns_statscounter_truncatedresp
*/
inc_stats(qctx->client,
ns_statscounter_rateslipped);
if (WANTCOOKIE(qctx->client)) {
qctx->client->message->flags &=
~DNS_MESSAGEFLAG_AA;
qctx->client->message->flags &=
~DNS_MESSAGEFLAG_AD;
qctx->client->message->rcode =
dns_rcode_badcookie;
} else {
qctx->client->message->flags |=
DNS_MESSAGEFLAG_TC;
if (resp_result ==
DNS_R_NXDOMAIN)
{
qctx->client->message->rcode =
dns_rcode_nxdomain;
}
}
}
return (DNS_R_DROP);
}
}
} else if (!TCP(qctx->client) &&
qctx->client->view->requireservercookie &&
WANTCOOKIE(qctx->client) && !HAVECOOKIE(qctx->client))
{
qctx->client->message->flags &= ~DNS_MESSAGEFLAG_AA;
qctx->client->message->flags &= ~DNS_MESSAGEFLAG_AD;
qctx->client->message->rcode = dns_rcode_badcookie;
return (DNS_R_DROP);
}
return (ISC_R_SUCCESS);
}
/*%
* Do any RPZ rewriting that may be needed for this query.
*/
static isc_result_t
query_checkrpz(query_ctx_t *qctx, isc_result_t result) {
isc_result_t rresult;
rresult = rpz_rewrite(qctx->client, qctx->qtype,
result, qctx->resuming,
qctx->rdataset, qctx->sigrdataset);
qctx->rpz_st = qctx->client->query.rpz_st;
switch (rresult) {
case ISC_R_SUCCESS:
break;
case DNS_R_DISALLOWED:
return (result);
case DNS_R_DELEGATION:
/*
* recursing for NS names or addresses,
* so save the main query state
*/
qctx->rpz_st->q.qtype = qctx->qtype;
qctx->rpz_st->q.is_zone = qctx->is_zone;
qctx->rpz_st->q.authoritative = qctx->authoritative;
SAVE(qctx->rpz_st->q.zone, qctx->zone);
SAVE(qctx->rpz_st->q.db, qctx->db);
SAVE(qctx->rpz_st->q.node, qctx->node);
SAVE(qctx->rpz_st->q.rdataset, qctx->rdataset);
SAVE(qctx->rpz_st->q.sigrdataset, qctx->sigrdataset);
dns_name_copy(qctx->fname, qctx->rpz_st->fname, NULL);
qctx->rpz_st->q.result = result;
qctx->client->query.attributes |= NS_QUERYATTR_RECURSING;
return (ISC_R_COMPLETE);
default:
RECURSE_ERROR(qctx, rresult);
return (ISC_R_COMPLETE);;
}
if (qctx->rpz_st->m.policy != DNS_RPZ_POLICY_MISS) {
qctx->rpz_st->state |= DNS_RPZ_REWRITTEN;
}
if (qctx->rpz_st->m.policy != DNS_RPZ_POLICY_MISS &&
qctx->rpz_st->m.policy != DNS_RPZ_POLICY_PASSTHRU &&
(qctx->rpz_st->m.policy != DNS_RPZ_POLICY_TCP_ONLY ||
!TCP(qctx->client)) &&
qctx->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(qctx->client->query.qname,
qctx->fname, NULL);
RUNTIME_CHECK(rresult == ISC_R_SUCCESS);
rpz_clean(&qctx->zone, &qctx->db, &qctx->node, NULL);
if (qctx->rpz_st->m.rdataset != NULL) {
query_putrdataset(qctx->client, &qctx->rdataset);
RESTORE(qctx->rdataset, qctx->rpz_st->m.rdataset);
} else {
qctx_clean(qctx);
}
qctx->version = NULL;
RESTORE(qctx->node, qctx->rpz_st->m.node);
RESTORE(qctx->db, qctx->rpz_st->m.db);
RESTORE(qctx->version, qctx->rpz_st->m.version);
RESTORE(qctx->zone, qctx->rpz_st->m.zone);
/*
* Add SOA record to additional section
*/
rresult = query_addsoa(qctx,
dns_rdataset_isassociated(qctx->rdataset),
DNS_SECTION_ADDITIONAL);
if (rresult != ISC_R_SUCCESS) {
QUERY_ERROR(qctx, result);
return (ISC_R_COMPLETE);
}
switch (qctx->rpz_st->m.policy) {
case DNS_RPZ_POLICY_TCP_ONLY:
qctx->client->message->flags |= DNS_MESSAGEFLAG_TC;
if (result == DNS_R_NXDOMAIN ||
result == DNS_R_NCACHENXDOMAIN)
qctx->client->message->rcode =
dns_rcode_nxdomain;
rpz_log_rewrite(qctx->client, ISC_FALSE,
qctx->rpz_st->m.policy,
qctx->rpz_st->m.type, qctx->zone,
qctx->rpz_st->p_name, NULL,
qctx->rpz_st->m.rpz->num);
return (ISC_R_COMPLETE);
case DNS_RPZ_POLICY_DROP:
QUERY_ERROR(qctx, DNS_R_DROP);
rpz_log_rewrite(qctx->client, ISC_FALSE,
qctx->rpz_st->m.policy,
qctx->rpz_st->m.type, qctx->zone,
qctx->rpz_st->p_name, NULL,
qctx->rpz_st->m.rpz->num);
return (ISC_R_COMPLETE);
case DNS_RPZ_POLICY_NXDOMAIN:
result = DNS_R_NXDOMAIN;
qctx->nxrewrite = ISC_TRUE;
qctx->rpz = ISC_TRUE;
break;
case DNS_RPZ_POLICY_NODATA:
result = DNS_R_NXRRSET;
qctx->nxrewrite = ISC_TRUE;
qctx->rpz = ISC_TRUE;
break;
case DNS_RPZ_POLICY_RECORD:
result = qctx->rpz_st->m.result;
if (qctx->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(qctx->rdataset))
dns_rdataset_disassociate(qctx->rdataset);
} else {
/*
* We will add this rdataset.
*/
qctx->rdataset->ttl =
ISC_MIN(qctx->rdataset->ttl,
qctx->rpz_st->m.ttl);
}
qctx->rpz = ISC_TRUE;
break;
case DNS_RPZ_POLICY_WILDCNAME: {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_cname_t cname;
result = dns_rdataset_first(qctx->rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(qctx->rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname,
NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdata_reset(&rdata);
result = query_rpzcname(qctx, &cname.cname);
if (result != ISC_R_SUCCESS)
return (ISC_R_COMPLETE);
qctx->fname = NULL;
qctx->want_restart = ISC_TRUE;
return (ISC_R_COMPLETE);
}
case DNS_RPZ_POLICY_CNAME:
/*
* Add overridding CNAME from a named.conf
* response-policy statement
*/
result = query_rpzcname(qctx,
&qctx->rpz_st->m.rpz->cname);
if (result != ISC_R_SUCCESS)
return (ISC_R_COMPLETE);
qctx->fname = NULL;
qctx->want_restart = ISC_TRUE;
return (ISC_R_COMPLETE);
default:
INSIST(0);
}
/*
* Turn off DNSSEC because the results of a
* response policy zone cannot verify.
*/
qctx->client->attributes &= ~(NS_CLIENTATTR_WANTDNSSEC |
NS_CLIENTATTR_WANTAD);
qctx->client->message->flags &= ~DNS_MESSAGEFLAG_AD;
query_putrdataset(qctx->client, &qctx->sigrdataset);
qctx->rpz_st->q.is_zone = qctx->is_zone;
qctx->is_zone = ISC_TRUE;
rpz_log_rewrite(qctx->client, ISC_FALSE,
qctx->rpz_st->m.policy,
qctx->rpz_st->m.type, qctx->zone,
qctx->rpz_st->p_name, NULL,
qctx->rpz_st->m.rpz->num);
}
return (result);
}
/*%
* Add a CNAME to a 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
query_rpzcname(query_ctx_t *qctx, dns_name_t *cname) {
ns_client_t *client = qctx->client;
dns_fixedname_t prefix, suffix;
unsigned int labels;
isc_result_t result;
CTRACE(ISC_LOG_DEBUG(3), "query_rpzcname");
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),
qctx->fname, NULL);
if (result == DNS_R_NAMETOOLONG) {
client->message->rcode = dns_rcode_yxdomain;
} else if (result != ISC_R_SUCCESS) {
return (result);
}
} else {
result = dns_name_copy(cname, qctx->fname, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
query_keepname(client, qctx->fname, qctx->dbuf);
result = query_addcname(qctx, dns_trust_authanswer,
qctx->rpz_st->m.ttl);
if (result != ISC_R_SUCCESS) {
return (result);
}
rpz_log_rewrite(client, ISC_FALSE, qctx->rpz_st->m.policy,
qctx->rpz_st->m.type, qctx->rpz_st->m.zone,
qctx->rpz_st->p_name, qctx->fname,
qctx->rpz_st->m.rpz->num);
ns_client_qnamereplace(client, qctx->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);
}
/*%
* Continue after doing a database lookup or returning from
* recursion, and call out to the next function depending on the
* result from the search.
*/
static isc_result_t
query_gotanswer(query_ctx_t *qctx, isc_result_t result) {
char errmsg[256];
CCTRACE(ISC_LOG_DEBUG(3), "query_gotanswer");
if (query_checkrrl(qctx, result) != ISC_R_SUCCESS) {
return (query_done(qctx));
}
if (!RECURSING(qctx->client) &&
!dns_name_equal(qctx->client->query.qname, dns_rootname))
{
result = query_checkrpz(qctx, result);
if (result == ISC_R_COMPLETE)
return (query_done(qctx));
}
switch (result) {
case ISC_R_SUCCESS:
return (query_prepresponse(qctx));
case DNS_R_GLUE:
case DNS_R_ZONECUT:
INSIST(qctx->is_zone);
qctx->authoritative = ISC_FALSE;
return (query_prepresponse(qctx));
case ISC_R_NOTFOUND:
return (query_notfound(qctx));
case DNS_R_DELEGATION:
return (query_delegation(qctx));
case DNS_R_EMPTYNAME:
return (query_nodata(qctx, DNS_R_EMPTYNAME));
case DNS_R_NXRRSET:
return (query_nodata(qctx, DNS_R_NXRRSET));
case DNS_R_EMPTYWILD:
return (query_nxdomain(qctx, ISC_TRUE));
case DNS_R_NXDOMAIN:
return (query_nxdomain(qctx, ISC_FALSE));
case DNS_R_COVERINGNSEC:
return (query_coveringnsec(qctx));
case DNS_R_NCACHENXDOMAIN:
result = query_redirect(qctx);
if (result != ISC_R_COMPLETE)
return (result);
return (query_ncache(qctx, DNS_R_NCACHENXDOMAIN));
case DNS_R_NCACHENXRRSET:
return (query_ncache(qctx, DNS_R_NCACHENXRRSET));
case DNS_R_CNAME:
return (query_cname(qctx));
case DNS_R_DNAME:
return (query_dname(qctx));
default:
/*
* Something has gone wrong.
*/
snprintf(errmsg, sizeof(errmsg) - 1,
"query_gotanswer: unexpected error: %s",
isc_result_totext(result));
CCTRACE(ISC_LOG_ERROR, errmsg);
if (qctx->resuming) {
qctx->want_stale = ISC_TRUE;
} else {
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
}
return (query_done(qctx));
}
}
static void
query_addnoqnameproof(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
isc_buffer_t *dbuf, b;
dns_name_t *fname = NULL;
dns_rdataset_t *neg = NULL, *negsig = NULL;
isc_result_t result = ISC_R_NOMEMORY;
CTRACE(ISC_LOG_DEBUG(3), "query_addnoqnameproof");
if (qctx->noqname == NULL) {
return;
}
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(qctx->noqname, fname, neg, negsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
query_addrrset(client, &fname, &neg, &negsig, dbuf,
DNS_SECTION_AUTHORITY);
if ((qctx->noqname->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(qctx->noqname, 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);
}
}
/*%
* Build the response for a query for type ANY.
*/
static isc_result_t
query_respond_any(query_ctx_t *qctx) {
dns_name_t *tname;
int rdatasets_found = 0;
dns_rdatasetiter_t *rdsiter = NULL;
isc_result_t result;
dns_rdatatype_t onetype = 0; /* type to use for minimal-any */
#ifdef ALLOW_FILTER_AAAA
isc_boolean_t have_aaaa, have_a, have_sig;
/*
* If we are not authoritative, assume there is an A record
* even in if it is not in our cache. This assumption could
* be wrong but it is a good bet.
*/
have_aaaa = ISC_FALSE;
have_a = !qctx->authoritative;
have_sig = ISC_FALSE;
#endif
result = dns_db_allrdatasets(qctx->db, qctx->node,
qctx->version, 0, &rdsiter);
if (result != ISC_R_SUCCESS) {
CCTRACE(ISC_LOG_ERROR,
"query_respond_any: allrdatasets failed");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
/*
* 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 qctx->fname to
* NULL before leaving this block, otherwise we might try to
* cleanup qctx->fname even though we're using it!
*/
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
tname = qctx->fname;
result = dns_rdatasetiter_first(rdsiter);
while (result == ISC_R_SUCCESS) {
dns_rdatasetiter_current(rdsiter, qctx->rdataset);
#ifdef ALLOW_FILTER_AAAA
/*
* Notice the presence of A and AAAAs so
* that AAAAs can be hidden from IPv4 clients.
*/
if (qctx->client->filter_aaaa != dns_aaaa_ok) {
if (qctx->rdataset->type == dns_rdatatype_aaaa)
have_aaaa = ISC_TRUE;
else if (qctx->rdataset->type == dns_rdatatype_a)
have_a = ISC_TRUE;
}
#endif
if (qctx->is_zone && qctx->qtype == dns_rdatatype_any &&
!dns_db_issecure(qctx->db) &&
dns_rdatatype_isdnssec(qctx->rdataset->type))
{
/*
* The zone is transitioning from insecure
* to secure. Hide the dnssec records from
* ANY queries.
*/
dns_rdataset_disassociate(qctx->rdataset);
} else if (qctx->client->view->minimal_any &&
!TCP(qctx->client) && !WANTDNSSEC(qctx->client) &&
qctx->qtype == dns_rdatatype_any &&
(qctx->rdataset->type == dns_rdatatype_sig ||
qctx->rdataset->type == dns_rdatatype_rrsig))
{
CCTRACE(ISC_LOG_DEBUG(5), "query_respond_any: "
"minimal-any skip signature");
dns_rdataset_disassociate(qctx->rdataset);
} else if (qctx->client->view->minimal_any &&
!TCP(qctx->client) && onetype != 0 &&
qctx->rdataset->type != onetype &&
qctx->rdataset->covers != onetype)
{
CCTRACE(ISC_LOG_DEBUG(5), "query_respond_any: "
"minimal-any skip rdataset");
dns_rdataset_disassociate(qctx->rdataset);
} else if ((qctx->qtype == dns_rdatatype_any ||
qctx->rdataset->type == qctx->qtype) &&
qctx->rdataset->type != 0)
{
#ifdef ALLOW_FILTER_AAAA
if (dns_rdatatype_isdnssec(qctx->rdataset->type))
have_sig = ISC_TRUE;
#endif
if (NOQNAME(qctx->rdataset) && WANTDNSSEC(qctx->client))
{
qctx->noqname = qctx->rdataset;
} else {
qctx->noqname = NULL;
}
qctx->rpz_st = qctx->client->query.rpz_st;
if (qctx->rpz_st != NULL)
qctx->rdataset->ttl =
ISC_MIN(qctx->rdataset->ttl,
qctx->rpz_st->m.ttl);
if (!qctx->is_zone && RECURSIONOK(qctx->client)) {
dns_name_t *name;
name = (qctx->fname != NULL)
? qctx->fname
: tname;
query_prefetch(qctx->client, name,
qctx->rdataset);
}
/*
* Remember the first RRtype we find so we
* can skip others with minimal-any.
*/
if (qctx->rdataset->type == dns_rdatatype_sig ||
qctx->rdataset->type == dns_rdatatype_rrsig)
onetype = qctx->rdataset->covers;
else
onetype = qctx->rdataset->type;
query_addrrset(qctx->client,
(qctx->fname != NULL)
? &qctx->fname
: &tname,
&qctx->rdataset, NULL,
NULL, DNS_SECTION_ANSWER);
query_addnoqnameproof(qctx);
rdatasets_found++;
INSIST(tname != NULL);
/*
* rdataset is non-NULL only in certain
* pathological cases involving DNAMEs.
*/
if (qctx->rdataset != NULL)
query_putrdataset(qctx->client,
&qctx->rdataset);
qctx->rdataset = query_newrdataset(qctx->client);
if (qctx->rdataset == NULL)
break;
} else {
/*
* We're not interested in this rdataset.
*/
dns_rdataset_disassociate(qctx->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 (qctx->client->filter_aaaa == dns_aaaa_break_dnssec)
qctx->client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
else if (qctx->client->filter_aaaa != dns_aaaa_ok &&
have_aaaa && have_a &&
(!have_sig || !WANTDNSSEC(qctx->client)))
qctx->client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
#endif
if (qctx->fname != NULL)
dns_message_puttempname(qctx->client->message, &qctx->fname);
if (rdatasets_found == 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 ((qctx->qtype == dns_rdatatype_rrsig ||
qctx->qtype == dns_rdatatype_sig) &&
result == ISC_R_NOMORE)
{
isc_buffer_t b;
if (!qctx->is_zone) {
qctx->authoritative = ISC_FALSE;
dns_rdatasetiter_destroy(&rdsiter);
qctx->client->attributes &= ~NS_CLIENTATTR_RA;
query_addauth(qctx);
return (query_done(qctx));
}
if (qctx->qtype == dns_rdatatype_rrsig &&
dns_db_issecure(qctx->db)) {
char namebuf[DNS_NAME_FORMATSIZE];
dns_name_format(qctx->client->query.qname,
namebuf,
sizeof(namebuf));
ns_client_log(qctx->client,
DNS_LOGCATEGORY_DNSSEC,
NS_LOGMODULE_QUERY,
ISC_LOG_WARNING,
"missing signature for %s",
namebuf);
}
dns_rdatasetiter_destroy(&rdsiter);
qctx->fname = query_newname(qctx->client,
qctx->dbuf, &b);
return (query_sign_nodata(qctx));
} else {
CCTRACE(ISC_LOG_ERROR,
"query_respond_any: "
"no matching rdatasets in cache");
result = DNS_R_SERVFAIL;
}
}
dns_rdatasetiter_destroy(&rdsiter);
if (result != ISC_R_NOMORE) {
CCTRACE(ISC_LOG_ERROR,
"query_respond_any: dns_rdatasetiter_destroy failed");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
} else {
query_addauth(qctx);
}
return (query_done(qctx));
}
/*
* Set the expire time, if requested, when answering from a
* slave or master zone.
*/
static void
query_getexpire(query_ctx_t *qctx) {
dns_zone_t *raw = NULL, *mayberaw;
if (qctx->zone == NULL || !qctx->is_zone ||
qctx->qtype != dns_rdatatype_soa ||
qctx->client->query.restarts != 0 ||
(qctx->client->attributes & NS_CLIENTATTR_WANTEXPIRE) == 0)
{
return;
}
dns_zone_getraw(qctx->zone, &raw);
mayberaw = (raw != NULL) ? raw : qctx->zone;
if (dns_zone_gettype(mayberaw) == dns_zone_slave) {
isc_time_t expiretime;
isc_uint32_t secs;
dns_zone_getexpiretime(qctx->zone, &expiretime);
secs = isc_time_seconds(&expiretime);
if (secs >= qctx->client->now &&
qctx->result == ISC_R_SUCCESS)
{
qctx->client->attributes |=
NS_CLIENTATTR_HAVEEXPIRE;
qctx->client->expire = secs - qctx->client->now;
}
} else if (dns_zone_gettype(mayberaw) == dns_zone_master) {
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_soa_t soa;
result = dns_rdataset_first(qctx->rdataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(qctx->rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &soa, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
qctx->client->expire = soa.expire;
qctx->client->attributes |= NS_CLIENTATTR_HAVEEXPIRE;
}
if (raw != NULL) {
dns_zone_detach(&raw);
}
}
#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.
*/
static isc_result_t
query_filter_aaaa(query_ctx_t *qctx) {
isc_result_t result;
if (qctx->client->filter_aaaa != dns_aaaa_break_dnssec &&
(qctx->client->filter_aaaa != dns_aaaa_filter ||
(WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL &&
dns_rdataset_isassociated(qctx->sigrdataset))))
{
return (ISC_R_COMPLETE);
}
if (qctx->qtype == dns_rdatatype_aaaa) {
dns_rdataset_t *trdataset;
trdataset = query_newrdataset(qctx->client);
result = dns_db_findrdataset(qctx->db, qctx->node,
qctx->version,
dns_rdatatype_a, 0,
qctx->client->now,
trdataset, NULL);
if (dns_rdataset_isassociated(trdataset)) {
dns_rdataset_disassociate(trdataset);
}
query_putrdataset(qctx->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) {
qctx->client->attributes |=
NS_CLIENTATTR_FILTER_AAAA;
} else if (qctx->authoritative ||
!RECURSIONOK(qctx->client) ||
(result != DNS_R_DELEGATION &&
result != ISC_R_NOTFOUND))
{
qctx->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(qctx->client));
result = query_recurse(qctx->client,
dns_rdatatype_a,
qctx->client->query.qname,
NULL, NULL, qctx->resuming);
if (result == ISC_R_SUCCESS) {
qctx->client->attributes |=
NS_CLIENTATTR_FILTER_AAAA_RC;
qctx->client->query.attributes |=
NS_QUERYATTR_RECURSING;
}
}
} else if (qctx->qtype == dns_rdatatype_a &&
(qctx->client->attributes &
NS_CLIENTATTR_FILTER_AAAA_RC) != 0)
{
qctx->client->attributes &= ~NS_CLIENTATTR_FILTER_AAAA_RC;
qctx->client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
qctx_clean(qctx);
return (query_done(qctx));
}
return (ISC_R_COMPLETE);
}
#endif
/*%
* Build a repsonse for a "normal" query, for a type other than ANY,
* for which we have an answer (either positive or negative).
*/
static isc_result_t
query_respond(query_ctx_t *qctx) {
dns_rdataset_t **sigrdatasetp = NULL;
isc_result_t result;
/*
* If we have a zero ttl from the cache, refetch.
*/
if (!qctx->is_zone && !qctx->resuming && !STALE(qctx->rdataset) &&
qctx->rdataset->ttl == 0 && RECURSIONOK(qctx->client))
{
qctx_clean(qctx);
INSIST(!REDIRECT(qctx->client));
result = query_recurse(qctx->client, qctx->qtype,
qctx->client->query.qname,
NULL, NULL, qctx->resuming);
if (result == ISC_R_SUCCESS) {
qctx->client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (qctx->dns64)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64;
if (qctx->dns64_exclude)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else {
RECURSE_ERROR(qctx, result);
}
return (query_done(qctx));
}
#ifdef ALLOW_FILTER_AAAA
result = query_filter_aaaa(qctx);
if (result != ISC_R_COMPLETE)
return (result);
#endif
/*
* Check to see if the AAAA RRset has non-excluded addresses
* in it. If not look for a A RRset.
*/
INSIST(qctx->client->query.dns64_aaaaok == NULL);
if (qctx->qtype == dns_rdatatype_aaaa && !qctx->dns64_exclude &&
!ISC_LIST_EMPTY(qctx->client->view->dns64) &&
qctx->client->message->rdclass == dns_rdataclass_in &&
!dns64_aaaaok(qctx->client, qctx->rdataset, qctx->sigrdataset))
{
/*
* Look to see if there are A records for this name.
*/
qctx->client->query.dns64_ttl = qctx->rdataset->ttl;
SAVE(qctx->client->query.dns64_aaaa, qctx->rdataset);
SAVE(qctx->client->query.dns64_sigaaaa, qctx->sigrdataset);
query_releasename(qctx->client, &qctx->fname);
dns_db_detachnode(qctx->db, &qctx->node);
qctx->type = qctx->qtype = dns_rdatatype_a;
qctx->dns64_exclude = qctx->dns64 = ISC_TRUE;
return (query_lookup(qctx));
}
if (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL) {
sigrdatasetp = &qctx->sigrdataset;
}
if (NOQNAME(qctx->rdataset) && WANTDNSSEC(qctx->client)) {
qctx->noqname = qctx->rdataset;
} else {
qctx->noqname = NULL;
}
/*
* BIND 8 priming queries need the additional section.
*/
if (qctx->is_zone && qctx->qtype == dns_rdatatype_ns &&
dns_name_equal(qctx->client->query.qname, dns_rootname))
{
qctx->client->query.attributes &= ~NS_QUERYATTR_NOADDITIONAL;
}
/*
* Set expire time
*/
query_getexpire(qctx);
if (qctx->dns64) {
result = query_dns64(qctx);
qctx->noqname = NULL;
dns_rdataset_disassociate(qctx->rdataset);
dns_message_puttemprdataset(qctx->client->message,
&qctx->rdataset);
if (result == ISC_R_NOMORE) {
#ifndef dns64_bis_return_excluded_addresses
if (qctx->dns64_exclude) {
if (!qctx->is_zone)
return (query_done(qctx));
/*
* Add a fake SOA record.
*/
(void)query_addsoa(qctx, 600,
DNS_SECTION_AUTHORITY);
return (query_done(qctx));
}
#endif
if (qctx->is_zone) {
return (query_nodata(qctx, DNS_R_NXDOMAIN));
} else {
return (query_ncache(qctx, DNS_R_NXDOMAIN));
}
} else if (result != ISC_R_SUCCESS) {
qctx->result = result;
return (query_done(qctx));
}
} else if (qctx->client->query.dns64_aaaaok != NULL) {
query_filter64(qctx);
query_putrdataset(qctx->client, &qctx->rdataset);
} else {
if (!qctx->is_zone && RECURSIONOK(qctx->client))
query_prefetch(qctx->client, qctx->fname,
qctx->rdataset);
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, sigrdatasetp,
qctx->dbuf, DNS_SECTION_ANSWER);
}
query_addnoqnameproof(qctx);
/*
* We shouldn't ever fail to add 'rdataset'
* because it's already in the answer.
*/
INSIST(qctx->rdataset == NULL);
query_addauth(qctx);
return (query_done(qctx));
}
static isc_result_t
query_dns64(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
dns_aclenv_t *env = ns_interfacemgr_getaclenv(client->interface->mgr);
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;
const dns_section_t section = DNS_SECTION_ANSWER;
/*%
* To the current response for 'qctx->client', add the answer RRset
* '*rdatasetp' and an optional signature set '*sigrdatasetp', with
* owner name '*namep', to the answer section, unless they are
* already there. Also add any pertinent additional data.
*
* If 'qctx->dbuf' is not NULL, then 'qctx->fname' is the name
* whose data is stored 'qctx->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");
qctx->qtype = qctx->type = dns_rdatatype_aaaa;
name = qctx->fname;
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,
qctx->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 (qctx->dbuf != NULL)
query_releasename(client, &qctx->fname);
return (ISC_R_SUCCESS);
} else if (result == DNS_R_NXDOMAIN) {
/*
* The name doesn't exist.
*/
if (qctx->dbuf != NULL)
query_keepname(client, name, qctx->dbuf);
dns_message_addname(client->message, name, section);
qctx->fname = NULL;
mname = name;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (qctx->dbuf != NULL)
query_releasename(client, &qctx->fname);
}
if (qctx->rdataset->trust != dns_trust_secure) {
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(qctx->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 != ISC_UINT32_MAX)
dns64_rdatalist->ttl = ISC_MIN(qctx->rdataset->ttl,
client->query.dns64_ttl);
else
dns64_rdatalist->ttl = ISC_MIN(qctx->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 (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL &&
dns_rdataset_isassociated(qctx->sigrdataset))
flags |= DNS_DNS64_DNSSEC;
for (result = dns_rdataset_first(qctx->rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(qctx->rdataset)) {
for (dns64 = ISC_LIST_HEAD(client->view->dns64);
dns64 != NULL; dns64 = dns_dns64_next(dns64)) {
dns_rdataset_current(qctx->rdataset, &rdata);
isc_buffer_availableregion(buffer, &r);
INSIST(r.length >= 16);
result = dns_dns64_aaaafroma(dns64, &netaddr,
client->signer, env, 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 = qctx->rdataset->trust;
query_addrdataset(client, section, mname, dns64_rdataset);
dns64_rdataset = NULL;
dns64_rdatalist = NULL;
dns_message_takebuffer(client->message, &buffer);
inc_stats(client, ns_statscounter_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(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
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;
const dns_section_t section = DNS_SECTION_ANSWER;
CTRACE(ISC_LOG_DEBUG(3), "query_filter64");
INSIST(client->query.dns64_aaaaok != NULL);
INSIST(client->query.dns64_aaaaoklen ==
dns_rdataset_count(qctx->rdataset));
name = qctx->fname;
mname = NULL;
buffer = NULL;
myrdata = NULL;
myrdataset = NULL;
myrdatalist = NULL;
result = dns_message_findname(client->message, section,
name, dns_rdatatype_aaaa,
qctx->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 (qctx->dbuf != NULL)
query_releasename(client, &qctx->fname);
return;
} else if (result == DNS_R_NXDOMAIN) {
mname = name;
qctx->fname = NULL;
} else {
RUNTIME_CHECK(result == DNS_R_NXRRSET);
if (qctx->dbuf != NULL)
query_releasename(client, &qctx->fname);
qctx->dbuf = NULL;
}
if (qctx->rdataset->trust != dns_trust_secure) {
client->query.attributes &= ~NS_QUERYATTR_SECURE;
}
result = isc_buffer_allocate(client->mctx, &buffer,
16 * dns_rdataset_count(qctx->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 = qctx->rdataset->ttl;
i = 0;
for (result = dns_rdataset_first(qctx->rdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(qctx->rdataset)) {
if (!client->query.dns64_aaaaok[i++])
continue;
dns_rdataset_current(qctx->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 (qctx->dbuf != NULL)
query_keepname(client, name, qctx->dbuf);
dns_message_addname(client->message, name,
section);
qctx->dbuf = NULL;
}
myrdataset->trust = qctx->rdataset->trust;
query_addrdataset(client, section, 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 (qctx->dbuf != NULL)
query_releasename(client, &name);
CTRACE(ISC_LOG_DEBUG(3), "query_filter64: done");
}
/*%
* Handle the case of a name not being found in a database lookup.
* Called from query_gotanswer(). Passes off processing to
* query_delegation() for a root referral if appropriate.
*/
static isc_result_t
query_notfound(query_ctx_t *qctx) {
isc_result_t result;
INSIST(!qctx->is_zone);
if (qctx->db != NULL)
dns_db_detach(&qctx->db);
/*
* If the cache doesn't even have the root NS,
* try to get that from the hints DB.
*/
if (qctx->client->view->hints != NULL) {
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, qctx->client, NULL);
dns_db_attach(qctx->client->view->hints, &qctx->db);
result = dns_db_findext(qctx->db, dns_rootname,
NULL, dns_rdatatype_ns,
0, qctx->client->now, &qctx->node,
qctx->fname, &cm, &ci,
qctx->rdataset, qctx->sigrdataset);
} else {
/* We have no hints. */
result = ISC_R_FAILURE;
}
if (result != ISC_R_SUCCESS) {
/*
* Nonsensical root hints may require cleanup.
*/
qctx_clean(qctx);
/*
* We don't have any root server hints, but
* we may have working forwarders, so try to
* recurse anyway.
*/
if (RECURSIONOK(qctx->client)) {
INSIST(!REDIRECT(qctx->client));
result = query_recurse(qctx->client, qctx->qtype,
qctx->client->query.qname,
NULL, NULL, qctx->resuming);
if (result == ISC_R_SUCCESS) {
qctx->client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (qctx->dns64)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64;
if (qctx->dns64_exclude)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else
RECURSE_ERROR(qctx, result);
return (query_done(qctx));
} else {
/* Unable to give root server referral. */
CCTRACE(ISC_LOG_ERROR,
"unable to give root server referral");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
}
return (query_delegation(qctx));
}
/*%
* Handle a delegation response from an authoritative lookup. This
* may trigger additional lookups, e.g. from the cache database to
* see if we have a better answer; if that is not allowed, return the
* delegation to the client and call query_done().
*/
static isc_result_t
query_zone_delegation(query_ctx_t *qctx) {
isc_result_t result;
dns_rdataset_t **sigrdatasetp = NULL;
/*
* If the query type is DS, look to see if we are
* authoritative for the child zone
*/
if (!RECURSIONOK(qctx->client) &&
(qctx->options & DNS_GETDB_NOEXACT) != 0 &&
qctx->qtype == dns_rdatatype_ds)
{
dns_db_t *tdb = NULL;
dns_zone_t *tzone = NULL;
dns_dbversion_t *tversion = NULL;
result = query_getzonedb(qctx->client,
qctx->client->query.qname,
qctx->qtype,
DNS_GETDB_PARTIAL,
&tzone, &tdb,
&tversion);
if (result != ISC_R_SUCCESS) {
if (tdb != NULL)
dns_db_detach(&tdb);
if (tzone != NULL)
dns_zone_detach(&tzone);
} else {
qctx->options &= ~DNS_GETDB_NOEXACT;
query_putrdataset(qctx->client,
&qctx->rdataset);
if (qctx->sigrdataset != NULL)
query_putrdataset(qctx->client,
&qctx->sigrdataset);
if (qctx->fname != NULL)
query_releasename(qctx->client,
&qctx->fname);
if (qctx->node != NULL)
dns_db_detachnode(qctx->db,
&qctx->node);
if (qctx->db != NULL)
dns_db_detach(&qctx->db);
if (qctx->zone != NULL)
dns_zone_detach(&qctx->zone);
qctx->version = NULL;
RESTORE(qctx->version, tversion);
RESTORE(qctx->db, tdb);
RESTORE(qctx->zone, tzone);
qctx->authoritative = ISC_TRUE;
return (query_lookup(qctx));
}
}
if (USECACHE(qctx->client) && RECURSIONOK(qctx->client)) {
/*
* 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. If not, then query_lookup() calls
* query_notfound() which calls query_delegation(), and
* we'll restore these values there.
*/
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
dns_db_detachnode(qctx->db, &qctx->node);
SAVE(qctx->zdb, qctx->db);
SAVE(qctx->zfname, qctx->fname);
SAVE(qctx->zversion, qctx->version);
SAVE(qctx->zrdataset, qctx->rdataset);
SAVE(qctx->zsigrdataset, qctx->sigrdataset);
dns_db_attach(qctx->client->view->cachedb, &qctx->db);
qctx->is_zone = ISC_FALSE;
return (query_lookup(qctx));
}
/*
* qctx->fname could be released in
* query_addrrset(), so save a copy of it
* here in case we need it
*/
dns_fixedname_init(&qctx->dsname);
dns_name_copy(qctx->fname, dns_fixedname_name(&qctx->dsname), 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.
*/
qctx->client->query.gluedb = qctx->db;
qctx->client->query.isreferral = ISC_TRUE;
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
qctx->client->query.attributes &=
~NS_QUERYATTR_NOADDITIONAL;
if (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL)
sigrdatasetp = &qctx->sigrdataset;
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, sigrdatasetp,
qctx->dbuf, DNS_SECTION_AUTHORITY);
qctx->client->query.gluedb = NULL;
/*
* Add a DS if needed
*/
query_addds(qctx);
return (query_done(qctx));
}
/*%
* Handle delegation responses, including root referrals.
*
* If the delegation was returned from authoritative data,
* call query_zone_delgation(). Otherwise, we can start
* recursion if allowed; or else return the delegation to the
* client and call query_done().
*/
static isc_result_t
query_delegation(query_ctx_t *qctx) {
isc_result_t result;
dns_rdataset_t **sigrdatasetp = NULL;
qctx->authoritative = ISC_FALSE;
if (qctx->is_zone) {
return (query_zone_delegation(qctx));
}
if (qctx->zfname != NULL &&
(!dns_name_issubdomain(qctx->fname, qctx->zfname) ||
(qctx->is_staticstub_zone &&
dns_name_equal(qctx->fname, qctx->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.
* (See the comment above.)
* 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(qctx->client, &qctx->fname);
/*
* We've already done query_keepname() on
* qctx->zfname, so we must set dbuf to NULL to
* prevent query_addrrset() from trying to
* call query_keepname() again.
*/
qctx->dbuf = NULL;
query_putrdataset(qctx->client, &qctx->rdataset);
if (qctx->sigrdataset != NULL)
query_putrdataset(qctx->client,
&qctx->sigrdataset);
qctx->version = NULL;
RESTORE(qctx->fname, qctx->zfname);
RESTORE(qctx->version, qctx->zversion);
RESTORE(qctx->rdataset, qctx->zrdataset);
RESTORE(qctx->sigrdataset, qctx->zsigrdataset);
/*
* We don't clean up zdb here because we
* may still need it. It will get cleaned
* up by the main cleanup code in query_done().
*/
}
if (RECURSIONOK(qctx->client)) {
/*
* We have a delegation and recursion is allowed,
* so we call query_recurse() to follow it.
* This phase of the query processing is done;
* we'll resume via fetch_callback() and
* query_resume() when the recursion is complete.
*/
dns_name_t *qname = qctx->client->query.qname;
INSIST(!REDIRECT(qctx->client));
if (dns_rdatatype_atparent(qctx->type)) {
/*
* Parent is recursive for this rdata
* type (i.e., DS)
*/
result = query_recurse(qctx->client,
qctx->qtype, qname,
NULL, NULL,
qctx->resuming);
} else if (qctx->dns64) {
/*
* Look up an A record so we can
* synthesize DNS64
*/
result = query_recurse(qctx->client,
dns_rdatatype_a, qname,
NULL, NULL,
qctx->resuming);
} else {
/*
* Any other recursion
*/
result = query_recurse(qctx->client,
qctx->qtype, qname,
qctx->fname,
qctx->rdataset,
qctx->resuming);
}
if (result == ISC_R_SUCCESS) {
qctx->client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (qctx->dns64)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64;
if (qctx->dns64_exclude)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else if (result == DNS_R_DUPLICATE || result == DNS_R_DROP) {
QUERY_ERROR(qctx, result);
} else {
RECURSE_ERROR(qctx, result);
}
return (query_done(qctx));
}
/*
* We have a delegation but recursion is not
* allowed, so return the delegation to the client.
*
* qctx->fname could be released in
* query_addrrset(), so save a copy of it
* here in case we need it
*/
dns_fixedname_init(&qctx->dsname);
dns_name_copy(qctx->fname, dns_fixedname_name(&qctx->dsname), NULL);
/*
* This is the best answer.
*/
qctx->client->query.attributes |= NS_QUERYATTR_CACHEGLUEOK;
qctx->client->query.gluedb = qctx->zdb;
qctx->client->query.isreferral = ISC_TRUE;
/*
* We must ensure NOADDITIONAL is off,
* because the generation of
* additional data is required in
* delegations.
*/
qctx->client->query.attributes &= ~NS_QUERYATTR_NOADDITIONAL;
if (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL) {
sigrdatasetp = &qctx->sigrdataset;
}
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, sigrdatasetp,
qctx->dbuf, DNS_SECTION_AUTHORITY);
qctx->client->query.gluedb = NULL;
qctx->client->query.attributes &= ~NS_QUERYATTR_CACHEGLUEOK;
/*
* Add a DS if needed
*/
query_addds(qctx);
return (query_done(qctx));
}
/*%
* Add a DS record if needed.
*/
static void
query_addds(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
dns_fixedname_t fixed;
dns_name_t *fname = NULL;
dns_name_t *rname = NULL;
dns_name_t *name;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
isc_buffer_t *dbuf, b;
isc_result_t result;
unsigned int count;
CTRACE(ISC_LOG_DEBUG(3), "query_addds");
/*
* DS not needed.
*/
if (!WANTDNSSEC(client)) {
return;
}
/*
* 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(qctx->db, qctx->node, qctx->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(qctx->db, qctx->node,
qctx->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(qctx->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);
name = dns_fixedname_name(&qctx->dsname);
query_findclosestnsec3(name, qctx->db, qctx->version, client, rdataset,
sigrdataset, fname, ISC_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),
qctx->db, qctx->version, client,
rdataset, sigrdataset, fname,
ISC_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);
}
/*%
* Handle authoritative NOERROR/NODATA responses.
*/
static isc_result_t
query_nodata(query_ctx_t *qctx, isc_result_t result) {
#ifdef dns64_bis_return_excluded_addresses
if (qctx->dns64)
#else
if (qctx->dns64 && !qctx->dns64_exclude)
#endif
{
isc_buffer_t b;
/*
* Restore the answers from the previous AAAA lookup.
*/
if (qctx->rdataset != NULL)
query_putrdataset(qctx->client, &qctx->rdataset);
if (qctx->sigrdataset != NULL)
query_putrdataset(qctx->client, &qctx->sigrdataset);
RESTORE(qctx->rdataset, qctx->client->query.dns64_aaaa);
RESTORE(qctx->sigrdataset, qctx->client->query.dns64_sigaaaa);
if (qctx->fname == NULL) {
qctx->dbuf = query_getnamebuf(qctx->client);
if (qctx->dbuf == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_nodata: "
"query_getnamebuf failed (3)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));;
}
qctx->fname = query_newname(qctx->client,
qctx->dbuf, &b);
if (qctx->fname == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_nodata: "
"query_newname failed (3)");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));;
}
}
dns_name_copy(qctx->client->query.qname, qctx->fname, NULL);
qctx->dns64 = ISC_FALSE;
#ifdef dns64_bis_return_excluded_addresses
/*
* Resume the diverted processing of the AAAA response?
*/
if (qctx->dns64_exclude)
return (query_prepresponse(qctx));
#endif
} else if ((result == DNS_R_NXRRSET ||
result == DNS_R_NCACHENXRRSET) &&
!ISC_LIST_EMPTY(qctx->client->view->dns64) &&
qctx->client->message->rdclass == dns_rdataclass_in &&
qctx->qtype == dns_rdatatype_aaaa)
{
/*
* Look to see if there are A records for this name.
*/
switch (result) {
case DNS_R_NCACHENXRRSET:
/*
* This is from the negative cache; if the ttl is
* zero, we need to work out whether we have just
* decremented to zero or there was no negative
* cache ttl in the answer.
*/
if (qctx->rdataset->ttl != 0) {
qctx->client->query.dns64_ttl =
qctx->rdataset->ttl;
break;
}
if (dns_rdataset_first(qctx->rdataset) == ISC_R_SUCCESS)
qctx->client->query.dns64_ttl = 0;
break;
case DNS_R_NXRRSET:
qctx->client->query.dns64_ttl =
dns64_ttl(qctx->db, qctx->version);
break;
default:
INSIST(0);
}
SAVE(qctx->client->query.dns64_aaaa, qctx->rdataset);
SAVE(qctx->client->query.dns64_sigaaaa, qctx->sigrdataset);
query_releasename(qctx->client, &qctx->fname);
dns_db_detachnode(qctx->db, &qctx->node);
qctx->type = qctx->qtype = dns_rdatatype_a;
qctx->dns64 = ISC_TRUE;
return (query_lookup(qctx));
}
if (qctx->is_zone) {
return (query_sign_nodata(qctx));
} else {
/*
* 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(qctx->rdataset)) {
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
dns_message_addname(qctx->client->message,
qctx->fname,
DNS_SECTION_AUTHORITY);
ISC_LIST_APPEND(qctx->fname->list,
qctx->rdataset, link);
qctx->fname = NULL;
qctx->rdataset = NULL;
}
}
return (query_done(qctx));
}
/*%
* Add RRSIGs for NOERROR/NODATA responses when answering authoritatively.
*/
isc_result_t
query_sign_nodata(query_ctx_t *qctx) {
isc_result_t result;
/*
* Look for a NSEC3 record if we don't have a NSEC record.
*/
if (qctx->redirected)
return (query_done(qctx));
if (!dns_rdataset_isassociated(qctx->rdataset) &&
WANTDNSSEC(qctx->client))
{
if ((qctx->fname->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
dns_name_t *found;
dns_name_t *qname;
dns_fixedname_t fixed;
isc_buffer_t b;
dns_fixedname_init(&fixed);
found = dns_fixedname_name(&fixed);
qname = qctx->client->query.qname;
query_findclosestnsec3(qname, qctx->db, qctx->version,
qctx->client, qctx->rdataset,
qctx->sigrdataset, qctx->fname,
ISC_TRUE, found);
/*
* Did we find the closest provable encloser
* instead? If so add the nearest to the
* closest provable encloser.
*/
if (dns_rdataset_isassociated(qctx->rdataset) &&
!dns_name_equal(qname, found) &&
(((qctx->client->sctx->options &
NS_SERVER_NONEAREST) == 0) ||
qctx->qtype == dns_rdatatype_ds))
{
unsigned int count;
unsigned int skip;
/*
* Add the closest provable encloser.
*/
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset,
&qctx->sigrdataset,
qctx->dbuf,
DNS_SECTION_AUTHORITY);
count = dns_name_countlabels(found)
+ 1;
skip = dns_name_countlabels(qname) -
count;
dns_name_getlabelsequence(qname, skip,
count,
found);
fixfname(qctx->client, &qctx->fname,
&qctx->dbuf, &b);
fixrdataset(qctx->client, &qctx->rdataset);
fixrdataset(qctx->client, &qctx->sigrdataset);
if (qctx->fname == NULL ||
qctx->rdataset == NULL ||
qctx->sigrdataset == NULL) {
CCTRACE(ISC_LOG_ERROR,
"query_sign_nodata: "
"failure getting "
"closest encloser");
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
/*
* 'nearest' doesn't exist so
* 'exist' is set to ISC_FALSE.
*/
query_findclosestnsec3(found, qctx->db,
qctx->version,
qctx->client,
qctx->rdataset,
qctx->sigrdataset,
qctx->fname,
ISC_FALSE,
NULL);
}
} else {
query_releasename(qctx->client, &qctx->fname);
query_addwildcardproof(qctx, ISC_FALSE, ISC_TRUE);
}
}
if (dns_rdataset_isassociated(qctx->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(qctx->client, qctx->fname, qctx->dbuf);
} else if (qctx->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(qctx->client, &qctx->fname);
}
/*
* The RPZ SOA has already been added to the additional section
* if this was an RPZ rewrite, but if it wasn't, add it now.
*/
if (!qctx->nxrewrite) {
result = query_addsoa(qctx, ISC_UINT32_MAX,
DNS_SECTION_AUTHORITY);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(qctx, result);
return (query_done(qctx));
}
}
/*
* Add NSEC record if we found one.
*/
if (WANTDNSSEC(qctx->client) &&
dns_rdataset_isassociated(qctx->rdataset))
{
query_addnxrrsetnsec(qctx);
}
return (query_done(qctx));
}
static void
query_addnxrrsetnsec(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
dns_rdata_t sigrdata;
dns_rdata_rrsig_t sig;
unsigned int labels;
isc_buffer_t *dbuf, b;
dns_name_t *fname;
if ((qctx->fname->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
query_addrrset(client, &qctx->fname,
&qctx->rdataset, &qctx->sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
return;
}
if (qctx->sigrdataset == NULL ||
!dns_rdataset_isassociated(qctx->sigrdataset))
{
return;
}
if (dns_rdataset_first(qctx->sigrdataset) != ISC_R_SUCCESS) {
return;
}
dns_rdata_init(&sigrdata);
dns_rdataset_current(qctx->sigrdataset, &sigrdata);
if (dns_rdata_tostruct(&sigrdata, &sig, NULL) != ISC_R_SUCCESS) {
return;
}
labels = dns_name_countlabels(qctx->fname);
if ((unsigned int)sig.labels + 1 >= labels) {
return;
}
query_addwildcardproof(qctx, ISC_TRUE, ISC_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(qctx->fname, 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, &qctx->rdataset, &qctx->sigrdataset,
dbuf, DNS_SECTION_AUTHORITY);
}
/*%
* Handle NXDOMAIN and empty wildcard responses.
*/
static isc_result_t
query_nxdomain(query_ctx_t *qctx, isc_boolean_t empty_wild) {
dns_section_t section;
isc_uint32_t ttl;
isc_result_t result;
INSIST(qctx->is_zone || REDIRECT(qctx->client));
if (!empty_wild) {
result = query_redirect(qctx);
if (result != ISC_R_COMPLETE)
return (result);
}
if (dns_rdataset_isassociated(qctx->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(qctx->client, qctx->fname, qctx->dbuf);
} else if (qctx->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(qctx->client, &qctx->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.
*/
section = qctx->nxrewrite ? DNS_SECTION_ADDITIONAL
: DNS_SECTION_AUTHORITY;
ttl = ISC_UINT32_MAX;
if (!qctx->nxrewrite && qctx->qtype == dns_rdatatype_soa &&
qctx->zone != NULL && dns_zone_getzeronosoattl(qctx->zone))
{
ttl = 0;
}
result = query_addsoa(qctx, ttl, section);
if (result != ISC_R_SUCCESS) {
QUERY_ERROR(qctx, result);
return (query_done(qctx));
}
if (WANTDNSSEC(qctx->client)) {
/*
* Add NSEC record if we found one.
*/
if (dns_rdataset_isassociated(qctx->rdataset))
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, &qctx->sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
query_addwildcardproof(qctx, ISC_FALSE, ISC_FALSE);
}
/*
* Set message rcode.
*/
if (empty_wild)
qctx->client->message->rcode = dns_rcode_noerror;
else
qctx->client->message->rcode = dns_rcode_nxdomain;
return (query_done(qctx));
}
/*
* Handle both types of NXDOMAIN redirection, calling redirect()
* (which implements type redirect zones) and redirect2() (which
* implements recursive nxdomain-redirect lookups).
*
* Any result code other than ISC_R_COMPLETE means redirection was
* successful and the result code should be returned up the call stack.
*
* ISC_R_COMPLETE means we reached the end of this function without
* redirecting, so query processing should continue past it.
*/
static isc_result_t
query_redirect(query_ctx_t *qctx) {
isc_result_t result;
result = redirect(qctx->client, qctx->fname, qctx->rdataset,
&qctx->node, &qctx->db, &qctx->version,
qctx->type);
switch (result) {
case ISC_R_SUCCESS:
inc_stats(qctx->client,
ns_statscounter_nxdomainredirect);
return (query_prepresponse(qctx));
case DNS_R_NXRRSET:
qctx->redirected = ISC_TRUE;
qctx->is_zone = ISC_TRUE;
return (query_nodata(qctx, DNS_R_NXRRSET));
case DNS_R_NCACHENXRRSET:
qctx->redirected = ISC_TRUE;
qctx->is_zone = ISC_FALSE;
return (query_ncache(qctx, DNS_R_NCACHENXRRSET));
default:
break;
}
result = redirect2(qctx->client, qctx->fname, qctx->rdataset,
&qctx->node, &qctx->db, &qctx->version,
qctx->type, &qctx->is_zone);
switch (result) {
case ISC_R_SUCCESS:
inc_stats(qctx->client,
ns_statscounter_nxdomainredirect);
return (query_prepresponse(qctx));
case DNS_R_CONTINUE:
inc_stats(qctx->client,
ns_statscounter_nxdomainredirect_rlookup);
SAVE(qctx->client->query.redirect.db, qctx->db);
SAVE(qctx->client->query.redirect.node, qctx->node);
SAVE(qctx->client->query.redirect.zone, qctx->zone);
qctx->client->query.redirect.qtype = qctx->qtype;
INSIST(qctx->rdataset != NULL);
SAVE(qctx->client->query.redirect.rdataset, qctx->rdataset);
SAVE(qctx->client->query.redirect.sigrdataset,
qctx->sigrdataset);
qctx->client->query.redirect.result = DNS_R_NCACHENXDOMAIN;
dns_name_copy(qctx->fname, qctx->client->query.redirect.fname,
NULL);
qctx->client->query.redirect.authoritative =
qctx->authoritative;
qctx->client->query.redirect.is_zone = qctx->is_zone;
return (query_done(qctx));
case DNS_R_NXRRSET:
qctx->redirected = ISC_TRUE;
qctx->is_zone = ISC_TRUE;
return (query_nodata(qctx, DNS_R_NXRRSET));
case DNS_R_NCACHENXRRSET:
qctx->redirected = ISC_TRUE;
qctx->is_zone = ISC_FALSE;
return (query_ncache(qctx, DNS_R_NCACHENXRRSET));
default:
break;
}
return (ISC_R_COMPLETE);
}
/*%
* Logging function to be passed to dns_nsec_noexistnodata.
*/
static void
log_noexistnodata(void *val, int level, const char *fmt, ...) {
query_ctx_t *qctx = val;
va_list ap;
va_start(ap, fmt);
ns_client_logv(qctx->client, NS_LOGCATEGORY_QUERIES,
NS_LOGMODULE_QUERY, level, fmt, ap);
va_end(ap);
}
static dns_ttl_t
query_synthttl(dns_rdataset_t *soardataset, dns_rdataset_t *sigsoardataset,
dns_rdataset_t *p1rdataset, dns_rdataset_t *sigp1rdataset,
dns_rdataset_t *p2rdataset, dns_rdataset_t *sigp2rdataset)
{
dns_rdata_soa_t soa;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_ttl_t ttl;
isc_result_t result;
REQUIRE(soardataset != NULL);
REQUIRE(sigsoardataset != NULL);
REQUIRE(p1rdataset != NULL);
REQUIRE(sigp1rdataset != NULL);
result = dns_rdataset_first(soardataset);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(soardataset, &rdata);
dns_rdata_tostruct(&rdata, &soa, NULL);
ttl = ISC_MIN(soa.minimum, soardataset->ttl);
ttl = ISC_MIN(ttl, sigsoardataset->ttl);
ttl = ISC_MIN(ttl, p1rdataset->ttl);
ttl = ISC_MIN(ttl, sigp1rdataset->ttl);
if (p2rdataset != NULL)
ttl = ISC_MIN(ttl, p2rdataset->ttl);
if (sigp2rdataset != NULL)
ttl = ISC_MIN(ttl, sigp2rdataset->ttl);
return (ttl);
}
/*
* Synthesize a NODATA response from the SOA and covering NSEC in cache.
*/
static isc_result_t
query_synthnodata(query_ctx_t *qctx, const dns_name_t *signer,
dns_rdataset_t **soardatasetp,
dns_rdataset_t **sigsoardatasetp)
{
dns_name_t *name = NULL;
dns_ttl_t ttl;
isc_buffer_t *dbuf, b;
isc_result_t result;
/*
* Detemine the correct TTL to use for the SOA and RRSIG
*/
ttl = query_synthttl(*soardatasetp, *sigsoardatasetp,
qctx->rdataset, qctx->sigrdataset,
NULL, NULL);
(*soardatasetp)->ttl = (*sigsoardatasetp)->ttl = ttl;
/*
* We want the SOA record to be first, so save the
* NODATA proof's name now or else discard it.
*/
if (WANTDNSSEC(qctx->client)) {
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
} else {
query_releasename(qctx->client, &qctx->fname);
}
dbuf = query_getnamebuf(qctx->client);
if (dbuf == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
name = query_newname(qctx->client, dbuf, &b);
if (name == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_clone(signer, name);
/*
* Add SOA record. Omit the RRSIG if DNSSEC was not requested.
*/
if (!WANTDNSSEC(qctx->client)) {
sigsoardatasetp = NULL;
}
query_addrrset(qctx->client, &name, soardatasetp, sigsoardatasetp,
dbuf, DNS_SECTION_AUTHORITY);
if (WANTDNSSEC(qctx->client)) {
/*
* Add NODATA proof.
*/
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, &qctx->sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
}
result = ISC_R_SUCCESS;
inc_stats(qctx->client, ns_statscounter_nodatasynth);
cleanup:
if (name != NULL) {
query_releasename(qctx->client, &name);
}
return (result);
}
/*
* Synthesize a wildcard answer using the contents of 'rdataset'.
* qctx contains the NODATA proof.
*/
static isc_result_t
query_synthwildcard(query_ctx_t *qctx, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
dns_name_t *name = NULL;
isc_buffer_t *dbuf, b;
isc_result_t result;
dns_rdataset_t *clone = NULL, *sigclone = NULL;
dns_rdataset_t **sigrdatasetp;
/*
* We want the answer to be first, so save the
* NOQNAME proof's name now or else discard it.
*/
if (WANTDNSSEC(qctx->client)) {
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
} else {
query_releasename(qctx->client, &qctx->fname);
}
dbuf = query_getnamebuf(qctx->client);
if (dbuf == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
name = query_newname(qctx->client, dbuf, &b);
if (name == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_clone(qctx->client->query.qname, name);
clone = query_newrdataset(qctx->client);
if (clone == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_rdataset_clone(rdataset, clone);
/*
* Add answer RRset. Omit the RRSIG if DNSSEC was not requested.
*/
if (WANTDNSSEC(qctx->client)) {
sigclone = query_newrdataset(qctx->client);
if (sigclone == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_rdataset_clone(sigrdataset, sigclone);
sigrdatasetp = &sigclone;
} else {
sigrdatasetp = NULL;
}
query_addrrset(qctx->client, &name, &clone, sigrdatasetp,
dbuf, DNS_SECTION_ANSWER);
if (WANTDNSSEC(qctx->client)) {
/*
* Add NOQNAME proof.
*/
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, &qctx->sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
}
result = ISC_R_SUCCESS;
inc_stats(qctx->client, ns_statscounter_wildcardsynth);
cleanup:
if (name != NULL) {
query_releasename(qctx->client, &name);
}
if (clone != NULL) {
query_putrdataset(qctx->client, &clone);
}
if (sigclone != NULL) {
query_putrdataset(qctx->client, &sigclone);
}
return (result);
}
/*
* Add a synthesized CNAME record from the wildard RRset (rdataset)
* and NODATA proof by calling query_synthwildcard then setup to
* follow the CNAME.
*/
static isc_result_t
query_synthcnamewildcard(query_ctx_t *qctx, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset)
{
isc_result_t result;
dns_name_t *tname = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_cname_t cname;
result = query_synthwildcard(qctx, rdataset, sigrdataset);
qctx->client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Reset qname to be the target name of the CNAME and restart
* the query.
*/
result = dns_message_gettempname(qctx->client->message, &tname);
if (result != ISC_R_SUCCESS) {
return (result);
}
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (result);
}
dns_rdataset_current(rdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (result);
}
dns_name_init(tname, NULL);
result = dns_name_dup(&cname.cname, qctx->client->mctx, tname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
dns_rdata_freestruct(&cname);
return (result);
}
dns_rdata_freestruct(&cname);
ns_client_qnamereplace(qctx->client, tname);
qctx->want_restart = ISC_TRUE;
if (!WANTRECURSION(qctx->client)) {
qctx->options |= DNS_GETDB_NOLOG;
}
return (result);
}
/*
* Synthesize a NXDOMAIN response from qctx (which contains the
* NODATA proof), nowild + nowildrdataset + signowildrdataset (which
* contains the NOWILDCARD proof) and signer + soardatasetp + sigsoardatasetp
* which contain the SOA record + RRSIG for the negative answer.
*/
static isc_result_t
query_synthnxdomain(query_ctx_t *qctx,
dns_name_t *nowild,
dns_rdataset_t *nowildrdataset,
dns_rdataset_t *signowildrdataset,
dns_name_t *signer,
dns_rdataset_t **soardatasetp,
dns_rdataset_t **sigsoardatasetp)
{
dns_name_t *name = NULL;
dns_ttl_t ttl;
isc_buffer_t *dbuf, b;
isc_result_t result;
dns_rdataset_t *clone = NULL, *sigclone = NULL;
/*
* Detemine the correct TTL to use for the SOA and RRSIG
*/
ttl = query_synthttl(*soardatasetp, *sigsoardatasetp,
qctx->rdataset, qctx->sigrdataset,
nowildrdataset, signowildrdataset);
(*soardatasetp)->ttl = (*sigsoardatasetp)->ttl = ttl;
/*
* We want the SOA record to be first, so save the
* NOQNAME proof's name now or else discard it.
*/
if (WANTDNSSEC(qctx->client)) {
query_keepname(qctx->client, qctx->fname, qctx->dbuf);
} else {
query_releasename(qctx->client, &qctx->fname);
}
dbuf = query_getnamebuf(qctx->client);
if (dbuf == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
name = query_newname(qctx->client, dbuf, &b);
if (name == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_clone(signer, name);
/*
* Add SOA record. Omit the RRSIG if DNSSEC was not requested.
*/
if (!WANTDNSSEC(qctx->client)) {
sigsoardatasetp = NULL;
}
query_addrrset(qctx->client, &name, soardatasetp, sigsoardatasetp,
dbuf, DNS_SECTION_AUTHORITY);
if (WANTDNSSEC(qctx->client)) {
/*
* Add NOQNAME proof.
*/
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, &qctx->sigrdataset,
NULL, DNS_SECTION_AUTHORITY);
dbuf = query_getnamebuf(qctx->client);
if (dbuf == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
name = query_newname(qctx->client, dbuf, &b);
if (name == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_clone(nowild, name);
clone = query_newrdataset(qctx->client);
sigclone = query_newrdataset(qctx->client);
if (clone == NULL || sigclone == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_rdataset_clone(nowildrdataset, clone);
dns_rdataset_clone(signowildrdataset, sigclone);
/*
* Add NOWILDCARD proof.
*/
query_addrrset(qctx->client, &name, &clone, &sigclone,
dbuf, DNS_SECTION_AUTHORITY);
}
qctx->client->message->rcode = dns_rcode_nxdomain;
result = ISC_R_SUCCESS;
inc_stats(qctx->client, ns_statscounter_nxdomainsynth);
cleanup:
if (name != NULL) {
query_releasename(qctx->client, &name);
}
if (clone != NULL) {
query_putrdataset(qctx->client, &clone);
}
if (sigclone != NULL) {
query_putrdataset(qctx->client, &sigclone);
}
return (result);
}
/*
* Check that all signer names in sigrdataset match the expected signer.
*/
static isc_result_t
checksignames(dns_name_t *signer, dns_rdataset_t *sigrdataset) {
isc_result_t result;
for (result = dns_rdataset_first(sigrdataset);
result == ISC_R_SUCCESS;
result = dns_rdataset_next(sigrdataset)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_rrsig_t rrsig;
dns_rdataset_current(sigrdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
if (dns_name_countlabels(signer) == 0) {
dns_name_copy(&rrsig.signer, signer, NULL);
} else if (!dns_name_equal(signer, &rrsig.signer)) {
return (ISC_R_FAILURE);
}
}
return (ISC_R_SUCCESS);
}
/*%
* Handle covering NSEC responses.
*
* Verify the NSEC record is apropriate for the QNAME; if not,
* redo the initial query without DNS_DBFIND_COVERINGNSEC.
*
* If the covering NSEC proves that the name exists but not the type,
* synthesize a NODATA response.
*
* If the name doesn't exist, compute the wildcard record and check whether
* the wildcard name exists or not. If we can't determine this, redo the
* initial query without DNS_DBFIND_COVERINGNSEC.
*
* If the wildcard name does not exist, compute the SOA name and look that
* up. If the SOA record does not exist, redo the initial query without
* DNS_DBFIND_COVERINGNSEC. If the SOA record exists, synthesize an
* NXDOMAIN response from the found records.
*
* If the wildcard name does exist, perform a lookup for the requested
* type at the wildcard name.
*/
static isc_result_t
query_coveringnsec(query_ctx_t *qctx) {
dns_db_t *db = NULL;
dns_clientinfo_t ci;
dns_clientinfomethods_t cm;
dns_dbnode_t *node = NULL;
dns_fixedname_t fixed;
dns_fixedname_t fnowild;
dns_fixedname_t fsigner;
dns_fixedname_t fwild;
dns_name_t *fname = NULL;
dns_name_t *nowild = NULL;
dns_name_t *signer = NULL;
dns_name_t *wild = NULL;
dns_rdataset_t *soardataset = NULL, *sigsoardataset = NULL;
dns_rdataset_t rdataset, sigrdataset;
isc_boolean_t done = ISC_FALSE;
isc_boolean_t exists = ISC_TRUE, data = ISC_TRUE;
isc_boolean_t redirected = ISC_FALSE;
isc_result_t result = ISC_R_SUCCESS;
unsigned int dboptions = qctx->client->query.dboptions;
dns_rdataset_init(&rdataset);
dns_rdataset_init(&sigrdataset);
/*
* If we have no signer name, stop immediately.
*/
if (!dns_rdataset_isassociated(qctx->sigrdataset)) {
goto cleanup;
}
dns_fixedname_init(&fwild);
wild = dns_fixedname_name(&fwild);
dns_fixedname_init(&fixed);
fname = dns_fixedname_name(&fixed);
dns_fixedname_init(&fsigner);
signer = dns_fixedname_name(&fsigner);
dns_fixedname_init(&fnowild);
nowild = dns_fixedname_name(&fnowild);
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, qctx->client, NULL);
/*
* All signer names must be the same to accept.
*/
result = checksignames(signer, qctx->sigrdataset);
if (result != ISC_R_SUCCESS) {
result = ISC_R_SUCCESS;
goto cleanup;
}
/*
* Check that we have the correct NOQNAME NSEC record.
*/
result = dns_nsec_noexistnodata(qctx->qtype, qctx->client->query.qname,
qctx->fname, qctx->rdataset,
&exists, &data, wild,
log_noexistnodata, qctx);
if (result != ISC_R_SUCCESS || (exists && data)) {
goto cleanup;
}
if (exists) {
if (qctx->type == dns_rdatatype_any) { /* XXX not yet */
goto cleanup;
}
#ifdef ALLOW_FILTER_AAAA
if (qctx->client->filter_aaaa != dns_aaaa_ok &&
(qctx->type == dns_rdatatype_a ||
qctx->type == dns_rdatatype_aaaa)) /* XXX not yet */
{
goto cleanup;
}
#endif
if (!ISC_LIST_EMPTY(qctx->client->view->dns64) &&
(qctx->type == dns_rdatatype_a ||
qctx->type == dns_rdatatype_aaaa)) /* XXX not yet */
{
goto cleanup;
}
if (!qctx->resuming && !STALE(qctx->rdataset) &&
qctx->rdataset->ttl == 0 && RECURSIONOK(qctx->client))
{
goto cleanup;
}
soardataset = query_newrdataset(qctx->client);
sigsoardataset = query_newrdataset(qctx->client);
if (soardataset == NULL || sigsoardataset == NULL) {
goto cleanup;
}
/*
* Look for SOA record to construct NODATA response.
*/
dns_db_attach(qctx->db, &db);
result = dns_db_findext(db, signer, qctx->version,
dns_rdatatype_soa, dboptions,
qctx->client->now, &node,
fname, &cm, &ci, soardataset,
sigsoardataset);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
(void)query_synthnodata(qctx, signer,
&soardataset, &sigsoardataset);
done = ISC_TRUE;
goto cleanup;
}
/*
* Look up the no-wildcard proof.
*/
dns_db_attach(qctx->db, &db);
result = dns_db_findext(db, wild, qctx->version, qctx->type,
dboptions | DNS_DBFIND_COVERINGNSEC,
qctx->client->now, &node, nowild,
&cm, &ci, &rdataset, &sigrdataset);
if (rdataset.trust != dns_trust_secure ||
sigrdataset.trust != dns_trust_secure)
{
goto cleanup;
}
/*
* Zero TTL handling of wildcard record.
*
* We don't yet have code to handle synthesis and type ANY,
* AAAA filtering or dns64 processing so we abort the
* synthesis here if there would be a interaction.
*/
switch (result) {
case ISC_R_SUCCESS:
if (qctx->type == dns_rdatatype_any) { /* XXX not yet */
goto cleanup;
}
#ifdef ALLOW_FILTER_AAAA
if (qctx->client->filter_aaaa != dns_aaaa_ok &&
(qctx->type == dns_rdatatype_a ||
qctx->type == dns_rdatatype_aaaa)) /* XXX not yet */
{
goto cleanup;
}
#endif
if (!ISC_LIST_EMPTY(qctx->client->view->dns64) &&
(qctx->type == dns_rdatatype_a ||
qctx->type == dns_rdatatype_aaaa)) /* XXX not yet */
{
goto cleanup;
}
/* FALLTHROUGH */
case DNS_R_CNAME:
if (!qctx->resuming && !STALE(&rdataset) &&
rdataset.ttl == 0 && RECURSIONOK(qctx->client))
{
goto cleanup;
}
default:
break;
}
switch (result) {
case DNS_R_COVERINGNSEC:
result = dns_nsec_noexistnodata(qctx->qtype, wild,
nowild, &rdataset,
&exists, &data, NULL,
log_noexistnodata, qctx);
if (result != ISC_R_SUCCESS || exists) {
goto cleanup;
}
break;
case ISC_R_SUCCESS: /* wild card match */
(void)query_synthwildcard(qctx, &rdataset, &sigrdataset);
done = ISC_TRUE;
goto cleanup;
case DNS_R_CNAME: /* wild card cname */
(void)query_synthcnamewildcard(qctx, &rdataset, &sigrdataset);
done = ISC_TRUE;
goto cleanup;
case DNS_R_NCACHENXRRSET: /* wild card nodata */
case DNS_R_NCACHENXDOMAIN: /* direct nxdomain */
default:
goto cleanup;
}
/*
* We now have the proof that we have an NXDOMAIN. Apply
* NXDOMAIN redirection if configured.
*/
result = query_redirect(qctx);
if (result != ISC_R_COMPLETE) {
redirected = ISC_TRUE;
goto cleanup;
}
/*
* Must be signed to accept.
*/
if (!dns_rdataset_isassociated(&sigrdataset)) {
goto cleanup;
}
/*
* Check signer signer names again.
*/
result = checksignames(signer, &sigrdataset);
if (result != ISC_R_SUCCESS) {
result = ISC_R_SUCCESS;
goto cleanup;
}
if (node != NULL) {
dns_db_detachnode(db, &node);
}
soardataset = query_newrdataset(qctx->client);
sigsoardataset = query_newrdataset(qctx->client);
if (soardataset == NULL || sigsoardataset == NULL) {
goto cleanup;
}
/*
* Look for SOA record to construct NXDOMAIN response.
*/
result = dns_db_findext(db, signer, qctx->version,
dns_rdatatype_soa, dboptions,
qctx->client->now, &node,
fname, &cm, &ci, soardataset,
sigsoardataset);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
(void)query_synthnxdomain(qctx, nowild, &rdataset, &sigrdataset,
signer, &soardataset, &sigsoardataset);
done = ISC_TRUE;
cleanup:
if (dns_rdataset_isassociated(&rdataset)) {
dns_rdataset_disassociate(&rdataset);
}
if (dns_rdataset_isassociated(&sigrdataset)) {
dns_rdataset_disassociate(&sigrdataset);
}
if (soardataset != NULL) {
query_putrdataset(qctx->client, &soardataset);
}
if (sigsoardataset != NULL) {
query_putrdataset(qctx->client, &sigsoardataset);
}
if (db != NULL) {
if (node != NULL) {
dns_db_detachnode(db, &node);
}
dns_db_detach(&db);
}
if (redirected) {
return (result);
}
if (!done) {
/*
* No covering NSEC was found; proceed with recursion.
*/
qctx->findcoveringnsec = ISC_FALSE;
if (qctx->fname != NULL) {
query_releasename(qctx->client, &qctx->fname);
}
if (qctx->node != NULL) {
dns_db_detachnode(qctx->db, &qctx->node);
}
query_putrdataset(qctx->client, &qctx->rdataset);
if (qctx->sigrdataset != NULL) {
query_putrdataset(qctx->client, &qctx->sigrdataset);
}
return (query_lookup(qctx));
}
return (query_done(qctx));
}
/*%
* Handle negative cache responses, DNS_R_NCACHENXRRSET or
* DNS_R_NCACHENXDOMAIN. (Note: may also be called with result
* set to DNS_R_NXDOMAIN when handling DNS64 lookups.)
*/
static isc_result_t
query_ncache(query_ctx_t *qctx, isc_result_t result) {
INSIST(!qctx->is_zone);
INSIST(result == DNS_R_NCACHENXDOMAIN ||
result == DNS_R_NCACHENXRRSET ||
result == DNS_R_NXDOMAIN);
qctx->authoritative = ISC_FALSE;
if (result == DNS_R_NCACHENXDOMAIN) {
/*
* Set message rcode. (This is not done when
* result == DNS_R_NXDOMAIN because that means we're
* being called after a DNS64 lookup and don't want
* to update the rcode now.)
*/
qctx->client->message->rcode = dns_rcode_nxdomain;
/* Look for RFC 1918 leakage from Internet. */
if (qctx->qtype == dns_rdatatype_ptr &&
qctx->client->message->rdclass == dns_rdataclass_in &&
dns_name_countlabels(qctx->fname) == 7)
{
warn_rfc1918(qctx->client, qctx->fname, qctx->rdataset);
}
}
return (query_nodata(qctx, result));
}
/*
* Handle CNAME responses.
*/
static isc_result_t
query_cname(query_ctx_t *qctx) {
isc_result_t result;
dns_name_t *tname;
dns_rdataset_t *trdataset;
dns_rdataset_t **sigrdatasetp = NULL;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_cname_t cname;
/*
* If we have a zero ttl from the cache refetch it.
*/
if (!qctx->is_zone && !qctx->resuming && !STALE(qctx->rdataset) &&
qctx->rdataset->ttl == 0 && RECURSIONOK(qctx->client))
{
qctx_clean(qctx);
INSIST(!REDIRECT(qctx->client));
result = query_recurse(qctx->client, qctx->qtype,
qctx->client->query.qname,
NULL, NULL, qctx->resuming);
if (result == ISC_R_SUCCESS) {
qctx->client->query.attributes |=
NS_QUERYATTR_RECURSING;
if (qctx->dns64)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64;
if (qctx->dns64_exclude)
qctx->client->query.attributes |=
NS_QUERYATTR_DNS64EXCLUDE;
} else {
RECURSE_ERROR(qctx, result);
}
return (query_done(qctx));
}
/*
* 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 = qctx->rdataset;
/*
* Add the CNAME to the answer section.
*/
if (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL)
sigrdatasetp = &qctx->sigrdataset;
if (WANTDNSSEC(qctx->client) &&
(qctx->fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&qctx->wildcardname);
dns_name_copy(qctx->fname,
dns_fixedname_name(&qctx->wildcardname), NULL);
qctx->need_wildcardproof = ISC_TRUE;
}
if (NOQNAME(qctx->rdataset) && WANTDNSSEC(qctx->client)) {
qctx->noqname = qctx->rdataset;
} else {
qctx->noqname = NULL;
}
if (!qctx->is_zone && RECURSIONOK(qctx->client))
query_prefetch(qctx->client, qctx->fname, qctx->rdataset);
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, sigrdatasetp, qctx->dbuf,
DNS_SECTION_ANSWER);
query_addnoqnameproof(qctx);
/*
* We set the PARTIALANSWER attribute so that if anything goes
* wrong later on, we'll return what we've got so far.
*/
qctx->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(qctx->client->message, &tname);
if (result != ISC_R_SUCCESS)
return (query_done(qctx));
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &cname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
dns_name_init(tname, NULL);
result = dns_name_dup(&cname.cname, qctx->client->mctx, tname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
dns_rdata_freestruct(&cname);
return (query_done(qctx));
}
dns_rdata_freestruct(&cname);
ns_client_qnamereplace(qctx->client, tname);
qctx->want_restart = ISC_TRUE;
if (!WANTRECURSION(qctx->client))
qctx->options |= DNS_GETDB_NOLOG;
query_addauth(qctx);
return (query_done(qctx));
}
/*
* Handle DNAME responses.
*/
static isc_result_t
query_dname(query_ctx_t *qctx) {
dns_name_t *tname, *prefix;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_dname_t dname;
dns_fixedname_t fixed;
dns_rdataset_t *trdataset;
dns_rdataset_t **sigrdatasetp = NULL;
dns_namereln_t namereln;
isc_buffer_t b;
int order;
isc_result_t result;
unsigned int nlabels;
/*
* 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(qctx->client->query.qname, qctx->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 = qctx->rdataset;
/*
* Add the DNAME to the answer section.
*/
if (WANTDNSSEC(qctx->client) && qctx->sigrdataset != NULL)
sigrdatasetp = &qctx->sigrdataset;
if (WANTDNSSEC(qctx->client) &&
(qctx->fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&qctx->wildcardname);
dns_name_copy(qctx->fname,
dns_fixedname_name(&qctx->wildcardname), NULL);
qctx->need_wildcardproof = ISC_TRUE;
}
if (!qctx->is_zone && RECURSIONOK(qctx->client))
query_prefetch(qctx->client, qctx->fname, qctx->rdataset);
query_addrrset(qctx->client, &qctx->fname,
&qctx->rdataset, sigrdatasetp, qctx->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.
*/
qctx->client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
/*
* Get the target name of the DNAME.
*/
tname = NULL;
result = dns_message_gettempname(qctx->client->message, &tname);
if (result != ISC_R_SUCCESS)
return (query_done(qctx));
result = dns_rdataset_first(trdataset);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
dns_rdataset_current(trdataset, &rdata);
result = dns_rdata_tostruct(&rdata, &dname, NULL);
dns_rdata_reset(&rdata);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
dns_name_clone(&dname.dname, tname);
dns_rdata_freestruct(&dname);
/*
* Construct the new qname consisting of
* <found name prefix>.<dname target>
*/
dns_fixedname_init(&fixed);
prefix = dns_fixedname_name(&fixed);
dns_name_split(qctx->client->query.qname, nlabels, prefix, NULL);
INSIST(qctx->fname == NULL);
qctx->dbuf = query_getnamebuf(qctx->client);
if (qctx->dbuf == NULL) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
qctx->fname = query_newname(qctx->client, qctx->dbuf, &b);
if (qctx->fname == NULL) {
dns_message_puttempname(qctx->client->message, &tname);
return (query_done(qctx));
}
result = dns_name_concatenate(prefix, tname, qctx->fname, NULL);
dns_message_puttempname(qctx->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)
qctx->client->message->rcode = dns_rcode_yxdomain;
if (result != ISC_R_SUCCESS)
return (query_done(qctx));
query_keepname(qctx->client, qctx->fname, qctx->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_addcname(qctx, trdataset->trust, trdataset->ttl);
if (result != ISC_R_SUCCESS)
return (query_done(qctx));
/*
* Switch to the new qname and restart.
*/
ns_client_qnamereplace(qctx->client, qctx->fname);
qctx->fname = NULL;
qctx->want_restart = ISC_TRUE;
if (!WANTRECURSION(qctx->client))
qctx->options |= DNS_GETDB_NOLOG;
query_addauth(qctx);
return (query_done(qctx));
}
/*%
* Add CNAME to repsonse.
*/
static isc_result_t
query_addcname(query_ctx_t *qctx, dns_trust_t trust, dns_ttl_t ttl) {
ns_client_t *client = qctx->client;
dns_rdataset_t *rdataset = NULL;
dns_rdatalist_t *rdatalist = NULL;
dns_rdata_t *rdata = NULL;
isc_region_t r;
dns_name_t *aname = NULL;
isc_result_t result;
result = dns_message_gettempname(client->message, &aname);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_name_dup(client->query.qname, client->mctx, aname);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
result = dns_message_gettemprdatalist(client->message, &rdatalist);
if (result != ISC_R_SUCCESS) {
dns_message_puttempname(client->message, &aname);
return (result);
}
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);
}
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(qctx->fname, &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);
}
/*%
* Prepare to respond: determine whether a wildcard proof is needed,
* check whether to filter AAAA answers, then hand off to query_respond()
* or (for type ANY queries) query_respond_any().
*/
static isc_result_t
query_prepresponse(query_ctx_t *qctx) {
if (WANTDNSSEC(qctx->client) &&
(qctx->fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
{
dns_fixedname_init(&qctx->wildcardname);
dns_name_copy(qctx->fname,
dns_fixedname_name(&qctx->wildcardname), NULL);
qctx->need_wildcardproof = ISC_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.
*/
qctx->client->filter_aaaa = dns_aaaa_ok;
if (qctx->client->view->v4_aaaa != dns_aaaa_ok ||
qctx->client->view->v6_aaaa != dns_aaaa_ok)
{
isc_result_t result;
result = ns_client_checkaclsilent(qctx->client, NULL,
qctx->client->view->aaaa_acl,
ISC_TRUE);
if (result == ISC_R_SUCCESS &&
qctx->client->view->v4_aaaa != dns_aaaa_ok &&
is_v4_client(qctx->client))
qctx->client->filter_aaaa = qctx->client->view->v4_aaaa;
else if (result == ISC_R_SUCCESS &&
qctx->client->view->v6_aaaa != dns_aaaa_ok &&
is_v6_client(qctx->client))
qctx->client->filter_aaaa = qctx->client->view->v6_aaaa;
}
#endif
if (qctx->type == dns_rdatatype_any) {
return (query_respond_any(qctx));
} else {
return (query_respond(qctx));
}
}
/*%
* Add SOA to the authority section when sending negative responses
* (or to the additional section if sending negative responses triggered
* by RPZ rewriting.)
*/
static isc_result_t
query_addsoa(query_ctx_t *qctx, unsigned int override_ttl,
dns_section_t section)
{
ns_client_t *client = qctx->client;
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 (((client->sctx->options & NS_SERVER_NOSOA) != 0) &&
(!WANTDNSSEC(client) || !dns_rdataset_isassociated(qctx->rdataset)))
{
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(qctx->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(qctx->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(qctx->db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(qctx->db, node, qctx->version,
dns_rdatatype_soa, 0,
client->now,
rdataset, sigrdataset);
} else {
dns_fixedname_t foundname;
dns_name_t *fname;
dns_fixedname_init(&foundname);
fname = dns_fixedname_name(&foundname);
result = dns_db_findext(qctx->db, name, qctx->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);
if (result != ISC_R_SUCCESS)
goto cleanup;
if (override_ttl != ISC_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(qctx->db, &node);
return (eresult);
}
/*%
* Add NS to authority section (used when the zone apex is already known).
*/
static isc_result_t
query_addns(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
isc_result_t result, eresult;
dns_name_t *name = NULL, *fname;
dns_dbnode_t *node = NULL;
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;
dns_fixedname_init(&foundname);
fname = dns_fixedname_name(&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(qctx->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(qctx->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(qctx->db, &node);
if (result == ISC_R_SUCCESS) {
result = dns_db_findrdataset(qctx->db, node, qctx->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(qctx->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;
}
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(qctx->db, &node);
}
CTRACE(ISC_LOG_DEBUG(3), "query_addns: done");
return (eresult);
}
/*%
* Find the zone cut and add the best NS rrset to the authority section.
*/
static void
query_addbestns(query_ctx_t *qctx) {
ns_client_t *client = qctx->client;
dns_db_t *db = NULL, *zdb = NULL;
dns_dbnode_t *node = NULL;
dns_name_t *fname = NULL, *zfname = NULL;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_rdataset_t *zrdataset = NULL, *zsigrdataset = NULL;
isc_boolean_t is_zone = ISC_FALSE, use_zone = ISC_FALSE;
isc_buffer_t *dbuf = NULL;
isc_result_t result;
dns_dbversion_t *version = NULL;
dns_zone_t *zone = NULL;
isc_buffer_t b;
dns_clientinfomethods_t cm;
dns_clientinfo_t ci;
CTRACE(ISC_LOG_DEBUG(3), "query_addbestns");
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 = ISC_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 = ISC_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 = ISC_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
query_addwildcardproof(query_ctx_t *qctx, isc_boolean_t ispositive,
isc_boolean_t nodata)
{
ns_client_t *client = qctx->client;
isc_buffer_t *dbuf, b;
dns_name_t *name;
dns_name_t *fname = NULL;
dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
dns_fixedname_t wfixed;
dns_name_t *wname;
dns_dbnode_t *node = NULL;
unsigned int options;
unsigned int olabels, nlabels, labels;
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_nsec_t nsec;
isc_boolean_t 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");
dns_clientinfomethods_init(&cm, ns_client_sourceip);
dns_clientinfo_init(&ci, client, NULL);
/*
* If a name has been specifically flagged as needing
* a wildcard proof then it will have been copied to
* qctx->wildcardname. Otherwise we just use the client
* QNAME.
*/
if (qctx->need_wildcardproof) {
name = dns_fixedname_name(&qctx->wildcardname);
} else {
name = client->query.qname;
}
/*
* 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;
dns_fixedname_init(&wfixed);
wname = dns_fixedname_name(&wfixed);
again:
have_wname = ISC_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(qctx->db, name, qctx->version,
dns_rdatatype_nsec, options, 0, &node,
fname, &cm, &ci, rdataset, sigrdataset);
if (node != NULL)
dns_db_detachnode(qctx->db, &node);
if (!dns_rdataset_isassociated(rdataset)) {
/*
* No NSEC proof available, return NSEC3 proofs instead.
*/
dns_fixedname_init(&cfixed);
cname = dns_fixedname_name(&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(qctx->db, cname, qctx->version,
dns_rdatatype_nsec,
options, 0, NULL, fname,
&cm, &ci, NULL, NULL);
}
/*
* Add closest (provable) encloser NSEC3.
*/
query_findclosestnsec3(cname, qctx->db, qctx->version,
client, rdataset, sigrdataset,
fname, ISC_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, qctx->db, qctx->version,
client, rdataset, sigrdataset,
fname, ISC_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, qctx->db, qctx->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);
}
if (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 = ISC_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 = ISC_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);
}
/*%
* Add NS records, and NSEC/NSEC3 wildcard proof records if needed,
* to the authority section.
*/
static void
query_addauth(query_ctx_t *qctx) {
CCTRACE(ISC_LOG_DEBUG(3), "query_addauth");
/*
* Add NS records to the authority section (if we haven't already
* added them to the answer section).
*/
if (!qctx->want_restart && !NOAUTHORITY(qctx->client)) {
if (qctx->is_zone) {
if (!((qctx->qtype == dns_rdatatype_ns ||
qctx->qtype == dns_rdatatype_any) &&
dns_name_equal(qctx->client->query.qname,
dns_db_origin(qctx->db))))
{
(void)query_addns(qctx);
}
} else if (qctx->qtype != dns_rdatatype_ns) {
if (qctx->fname != NULL) {
query_releasename(qctx->client, &qctx->fname);
}
query_addbestns(qctx);
}
}
/*
* Add NSEC records to the authority section if they're needed for
* DNSSEC wildcard proofs.
*/
if (qctx->need_wildcardproof && dns_db_issecure(qctx->db))
query_addwildcardproof(qctx, ISC_TRUE, ISC_FALSE);
}
/*
* 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
query_setup_sortlist(query_ctx_t *qctx) {
isc_netaddr_t netaddr;
ns_client_t *client = qctx->client;
dns_aclenv_t *env = ns_interfacemgr_getaclenv(client->interface->mgr);
const void *order_arg = NULL;
isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
switch (ns_sortlist_setup(client->view->sortlist, env,
&netaddr, &order_arg))
{
case NS_SORTLISTTYPE_1ELEMENT:
dns_message_setsortorder(client->message,
query_sortlist_order_1element,
env, NULL, order_arg);
break;
case NS_SORTLISTTYPE_2ELEMENT:
dns_message_setsortorder(client->message,
query_sortlist_order_2element,
env, order_arg, NULL);
break;
case NS_SORTLISTTYPE_NONE:
break;
default:
INSIST(0);
break;
}
}
/*
* When sending a referral, if the answer to the question is
* in the glue, sort it to the start of the additional section.
*/
static inline void
query_glueanswer(query_ctx_t *qctx) {
const dns_namelist_t *secs = qctx->client->message->sections;
const dns_section_t section = DNS_SECTION_ADDITIONAL;
dns_name_t *name;
dns_message_t *msg;
dns_rdataset_t *rdataset = NULL;
if (!ISC_LIST_EMPTY(secs[DNS_SECTION_ANSWER]) ||
qctx->client->message->rcode != dns_rcode_noerror ||
(qctx->qtype != dns_rdatatype_a &&
qctx->qtype != dns_rdatatype_aaaa))
{
return;
}
msg = qctx->client->message;
for (name = ISC_LIST_HEAD(msg->sections[section]);
name != NULL;
name = ISC_LIST_NEXT(name, link))
if (dns_name_equal(name, qctx->client->query.qname)) {
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link))
if (rdataset->type == qctx->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;
}
}
/*%
* Finalize this phase of the query process:
*
* - Clean up
* - If we have an answer ready (positive or negative), send it.
* - If we need to restart for a chaining query, call ns__query_start() again.
* - If we've started recursion, then just clean up; things will be
* restarted via fetch_callback()/query_resume().
*/
static isc_result_t
query_done(query_ctx_t *qctx) {
const dns_namelist_t *secs = qctx->client->message->sections;
CCTRACE(ISC_LOG_DEBUG(3), "query_done");
PROCESS_HOOK(NS_QUERY_DONE_BEGIN, qctx);
/*
* General cleanup.
*/
qctx->rpz_st = qctx->client->query.rpz_st;
if (qctx->rpz_st != NULL &&
(qctx->rpz_st->state & DNS_RPZ_RECURSING) == 0)
{
rpz_match_clear(qctx->rpz_st);
qctx->rpz_st->state &= ~DNS_RPZ_DONE_QNAME;
}
qctx_clean(qctx);
qctx_freedata(qctx);
/*
* Clear the AA bit if we're not authoritative.
*/
if (qctx->client->query.restarts == 0 && !qctx->authoritative) {
qctx->client->message->flags &= ~DNS_MESSAGEFLAG_AA;
}
/*
* Do we need to restart the query (e.g. for CNAME chaining)?
*/
if (qctx->want_restart && qctx->client->query.restarts < MAX_RESTARTS) {
qctx->client->query.restarts++;
return (ns__query_start(qctx));
}
if (qctx->want_stale) {
dns_ttl_t stale_ttl = 0;
isc_result_t result;
isc_boolean_t staleanswersok = ISC_FALSE;
/*
* Stale answers only make sense if stale_ttl > 0 but
* we want rndc to be able to control returning stale
* answers if they are configured.
*/
dns_db_attach(qctx->client->view->cachedb, &qctx->db);
result = dns_db_getservestalettl(qctx->db, &stale_ttl);
if (result == ISC_R_SUCCESS && stale_ttl > 0) {
switch (qctx->client->view->staleanswersok) {
case dns_stale_answer_yes:
staleanswersok = ISC_TRUE;
break;
case dns_stale_answer_conf:
staleanswersok =
qctx->client->view->staleanswersenable;
break;
case dns_stale_answer_no:
staleanswersok = ISC_FALSE;
break;
}
} else {
staleanswersok = ISC_FALSE;
}
if (staleanswersok) {
qctx->client->query.dboptions |= DNS_DBFIND_STALEOK;
inc_stats(qctx->client, ns_statscounter_trystale);
if (qctx->client->query.fetch != NULL)
dns_resolver_destroyfetch(
&qctx->client->query.fetch);
return (query_lookup(qctx));
}
dns_db_detach(&qctx->db);
qctx->want_stale = ISC_FALSE;
QUERY_ERROR(qctx, DNS_R_SERVFAIL);
return (query_done(qctx));
}
if (qctx->result != ISC_R_SUCCESS &&
(!PARTIALANSWER(qctx->client) || WANTRECURSION(qctx->client) ||
qctx->result == DNS_R_DROP))
{
if (qctx->result == DNS_R_DUPLICATE ||
qctx->result == 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(qctx->client, qctx->result);
} 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(qctx->line >= 0);
query_error(qctx->client, qctx->result, qctx->line);
}
ns_client_detach(&qctx->client);
return (qctx->result);
}
/*
* If we're recursing then just return; the query will
* resume when recursion ends.
*/
if (RECURSING(qctx->client)) {
return (qctx->result);
}
/*
* We are done. Set up sortlist data for the message
* rendering code, sort the answer to the front of the
* additional section if necessary, make a final tweak
* to the AA bit if the auth-nxdomain config option
* says so, then render and send the response.
*/
query_setup_sortlist(qctx);
query_glueanswer(qctx);
if (qctx->client->message->rcode == dns_rcode_nxdomain &&
qctx->client->view->auth_nxdomain == ISC_TRUE)
{
qctx->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 (qctx->resuming &&
(ISC_LIST_EMPTY(secs[DNS_SECTION_ANSWER]) ||
qctx->client->message->rcode != dns_rcode_noerror))
{
qctx->result = ISC_R_FAILURE;
}
query_send(qctx->client);
ns_client_detach(&qctx->client);
return (qctx->result);
}
static inline void
log_tat(ns_client_t *client) {
char namebuf[DNS_NAME_FORMATSIZE];
char clientbuf[ISC_NETADDR_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
isc_netaddr_t netaddr;
char *tags = NULL;
size_t taglen = 0;
if (!isc_log_wouldlog(ns_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(&client->destaddr, clientbuf, sizeof(clientbuf));
dns_rdataclass_format(client->view->rdclass, classname,
sizeof(classname));
if (client->query.qtype == dns_rdatatype_dnskey) {
isc_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;
isc_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_lctx, NS_LOGCATEGORY_TAT, NS_LOGMODULE_QUERY,
ISC_LOG_INFO, "trust-anchor-telemetry '%s/%s' from %s%s",
namebuf, classname, 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 typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
char onbuf[ISC_NETADDR_FORMATSIZE];
char ecsbuf[DNS_ECS_FORMATSIZE + sizeof(" [ECS ]") - 1] = { 0 };
char ednsbuf[sizeof("E(65535)")] = { 0 };
dns_rdataset_t *rdataset;
int level = ISC_LOG_INFO;
if (! isc_log_wouldlog(ns_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, classname, sizeof(classname));
dns_rdatatype_format(rdataset->type, typename, sizeof(typename));
isc_netaddr_format(&client->destaddr, onbuf, sizeof(onbuf));
if (client->ednsversion >= 0)
snprintf(ednsbuf, sizeof(ednsbuf), "E(%hd)",
client->ednsversion);
if (HAVEECS(client)) {
strlcpy(ecsbuf, " [ECS ", sizeof(ecsbuf));
dns_ecs_format(&client->ecs, ecsbuf + 6, sizeof(ecsbuf) - 6);
strlcat(ecsbuf, "]", sizeof(ecsbuf));
}
ns_client_log(client, NS_LOGCATEGORY_QUERIES, NS_LOGMODULE_QUERY,
level, "query: %s %s %s %s%s%s%s%s%s%s (%s)%s",
namebuf, classname, typename,
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, ecsbuf);
}
static inline void
log_queryerror(ns_client_t *client, isc_result_t result, int line, int level) {
char namebuf[DNS_NAME_FORMATSIZE];
char typename[DNS_RDATATYPE_FORMATSIZE];
char classname[DNS_RDATACLASS_FORMATSIZE];
const char *namep, *typep, *classp, *sep1, *sep2;
dns_rdataset_t *rdataset;
if (!isc_log_wouldlog(ns_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, classname,
sizeof(classname));
classp = classname;
dns_rdatatype_format(rdataset->type, typename,
sizeof(typename));
typep = typename;
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 = client->message;
dns_rdataset_t *rdataset;
ns_client_t *qclient;
dns_rdatatype_t qtype;
unsigned int saved_extflags = client->extflags;
unsigned int saved_flags = client->message->flags;
REQUIRE(NS_CLIENT_VALID(client));
CTRACE(ISC_LOG_DEBUG(3), "ns_query_start");
/*
* Test only.
*/
if (((client->sctx->options & NS_SERVER_CLIENTTEST) != 0) &&
!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->recursion) {
/*
* 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 ((client->sctx->options & NS_SERVER_LOGQUERIES) != 0)
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(client->sctx->rcvquerystats, qtype);
log_tat(client);
if (dns_rdatatype_ismeta(qtype)) {
switch (qtype) {
case dns_rdatatype_any:
break; /* Let the query logic 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,
client->sctx->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);
}
/*
* 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 ||
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)
client->query.attributes &= ~NS_QUERYATTR_SECURE;
/*
* Set NS_CLIENTATTR_WANTDNSSEC 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, ISC_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 ((client->sctx->options & NS_SERVER_NOAA) == 0)
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_setup(qclient, qtype);
}
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