File cache_poisoning.diff of Package bind
diff -uNr bind-9.5.2/bin/named/query.c bind-9.5.2-P1/bin/named/query.c
--- bind-9.5.2/bin/named/query.c 2009-09-17 00:28:52.000000000 +0200
+++ bind-9.5.2-P1/bin/named/query.c 2009-11-19 00:41:17.000000000 +0100
@@ -110,6 +110,8 @@
#define DNS_GETDB_NOLOG 0x02U
#define DNS_GETDB_PARTIAL 0x04U
+#define PENDINGOK(x) (((x) & DNS_DBFIND_PENDINGOK) != 0)
+
typedef struct client_additionalctx {
ns_client_t *client;
dns_rdataset_t *rdataset;
@@ -1744,8 +1746,8 @@
*/
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
- (rdataset->trust == dns_trust_pending ||
- rdataset->trust == dns_trust_glue) &&
+ (DNS_TRUST_PENDING(rdataset->trust) ||
+ DNS_TRUST_GLUE(rdataset->trust)) &&
!validate(client, db, fname, rdataset, sigrdataset)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
@@ -1784,8 +1786,8 @@
*/
if (result == ISC_R_SUCCESS &&
additionaltype == dns_rdatasetadditional_fromcache &&
- (rdataset->trust == dns_trust_pending ||
- rdataset->trust == dns_trust_glue) &&
+ (DNS_TRUST_PENDING(rdataset->trust) ||
+ DNS_TRUST_GLUE(rdataset->trust)) &&
!validate(client, db, fname, rdataset, sigrdataset)) {
dns_rdataset_disassociate(rdataset);
if (dns_rdataset_isassociated(sigrdataset))
@@ -2570,14 +2572,14 @@
/*
* Attempt to validate RRsets that are pending or that are glue.
*/
- if ((rdataset->trust == dns_trust_pending ||
- (sigrdataset != NULL && sigrdataset->trust == dns_trust_pending))
+ if ((DNS_TRUST_PENDING(rdataset->trust) ||
+ (sigrdataset != NULL && DNS_TRUST_PENDING(sigrdataset->trust)))
&& !validate(client, db, fname, rdataset, sigrdataset) &&
- (client->query.dboptions & DNS_DBFIND_PENDINGOK) == 0)
+ !PENDINGOK(client->query.dboptions))
goto cleanup;
- if ((rdataset->trust == dns_trust_glue ||
- (sigrdataset != NULL && sigrdataset->trust == dns_trust_glue)) &&
+ 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;
@@ -3387,6 +3389,8 @@
isc_boolean_t empty_wild;
dns_rdataset_t *noqname;
isc_boolean_t resuming;
+ dns_rdataset_t tmprdataset;
+ unsigned int dboptions;
CTRACE("query_find");
@@ -3603,9 +3607,49 @@
/*
* Now look for an answer in the database.
*/
+ dboptions = client->query.dboptions;
+ if (sigrdataset == NULL && client->view->enablednssec) {
+ /*
+ * If the client doesn't want DNSSEC we still want to
+ * look for any data pending validation to save a remote
+ * lookup if possible.
+ */
+ dns_rdataset_init(&tmprdataset);
+ sigrdataset = &tmprdataset;
+ dboptions |= DNS_DBFIND_PENDINGOK;
+ }
+ refind:
result = dns_db_find(db, client->query.qname, version, type,
- client->query.dboptions, client->now,
- &node, fname, rdataset, sigrdataset);
+ dboptions, client->now, &node, fname,
+ rdataset, sigrdataset);
+ /*
+ * If we have found pending data try to validate it.
+ * If the data does not validate as secure and we can't
+ * use the unvalidated data requery the database with
+ * pending disabled to prevent infinite looping.
+ */
+ if (result != ISC_R_SUCCESS || !DNS_TRUST_PENDING(rdataset->trust))
+ goto validation_done;
+ if (validate(client, db, fname, rdataset, sigrdataset))
+ goto validation_done;
+ if (rdataset->trust != dns_trust_pending_answer ||
+ !PENDINGOK(client->query.dboptions)) {
+ dns_rdataset_disassociate(rdataset);
+ if (sigrdataset != NULL &&
+ dns_rdataset_isassociated(sigrdataset))
+ dns_rdataset_disassociate(sigrdataset);
+ if (sigrdataset == &tmprdataset)
+ sigrdataset = NULL;
+ dns_db_detachnode(db, &node);
+ dboptions &= ~DNS_DBFIND_PENDINGOK;
+ goto refind;
+ }
+ validation_done:
+ if (sigrdataset == &tmprdataset) {
+ if (dns_rdataset_isassociated(sigrdataset))
+ dns_rdataset_disassociate(sigrdataset);
+ sigrdataset = NULL;
+ }
resume:
CTRACE("query_find: resume");
diff -uNr bind-9.5.2/lib/dns/include/dns/types.h bind-9.5.2-P1/lib/dns/include/dns/types.h
--- bind-9.5.2/lib/dns/include/dns/types.h 2009-01-29 23:41:45.000000000 +0100
+++ bind-9.5.2-P1/lib/dns/include/dns/types.h 2009-11-19 00:41:18.000000000 +0100
@@ -253,40 +253,52 @@
dns_trust_none = 0,
#define dns_trust_none ((dns_trust_t)dns_trust_none)
- /*% Subject to DNSSEC validation but has not yet been validated */
- dns_trust_pending = 1,
-#define dns_trust_pending ((dns_trust_t)dns_trust_pending)
+ /*%
+ * Subject to DNSSEC validation but has not yet been validated
+ * dns_trust_pending_additional (from the additional section).
+ */
+ dns_trust_pending_additional = 1,
+#define dns_trust_pending_additional \
+ ((dns_trust_t)dns_trust_pending_additional)
+
+ dns_trust_pending_answer = 2,
+#define dns_trust_pending_answer ((dns_trust_t)dns_trust_pending_answer)
/*% Received in the additional section of a response. */
- dns_trust_additional = 2,
+ dns_trust_additional = 3,
#define dns_trust_additional ((dns_trust_t)dns_trust_additional)
/* Received in a referral response. */
- dns_trust_glue = 3,
+ dns_trust_glue = 4,
#define dns_trust_glue ((dns_trust_t)dns_trust_glue)
/* Answser from a non-authoritative server */
- dns_trust_answer = 4,
+ dns_trust_answer = 5,
#define dns_trust_answer ((dns_trust_t)dns_trust_answer)
/* Received in the authority section as part of an
authoritative response */
- dns_trust_authauthority = 5,
+ dns_trust_authauthority = 6,
#define dns_trust_authauthority ((dns_trust_t)dns_trust_authauthority)
/* Answser from an authoritative server */
- dns_trust_authanswer = 6,
+ dns_trust_authanswer = 7,
#define dns_trust_authanswer ((dns_trust_t)dns_trust_authanswer)
/* Successfully DNSSEC validated */
- dns_trust_secure = 7,
+ dns_trust_secure = 8,
#define dns_trust_secure ((dns_trust_t)dns_trust_secure)
/* This server is authoritative */
- dns_trust_ultimate = 8
+ dns_trust_ultimate = 9
#define dns_trust_ultimate ((dns_trust_t)dns_trust_ultimate)
};
+#define DNS_TRUST_PENDING(x) ((x) == dns_trust_pending_answer || \
+ (x) == dns_trust_pending_additional)
+#define DNS_TRUST_GLUE(x) ((x) == dns_trust_glue)
+
+
/*%
* Name checking severites.
*/
diff -uNr bind-9.5.2/lib/dns/masterdump.c bind-9.5.2-P1/lib/dns/masterdump.c
--- bind-9.5.2/lib/dns/masterdump.c 2009-01-20 00:47:02.000000000 +0100
+++ bind-9.5.2-P1/lib/dns/masterdump.c 2009-11-19 00:41:18.000000000 +0100
@@ -774,7 +774,8 @@
static const char *trustnames[] = {
"none",
- "pending",
+ "pending-additional",
+ "pending-answer",
"additional",
"glue",
"answer",
diff -uNr bind-9.5.2/lib/dns/rbtdb.c bind-9.5.2-P1/lib/dns/rbtdb.c
--- bind-9.5.2/lib/dns/rbtdb.c 2009-05-07 01:34:47.000000000 +0200
+++ bind-9.5.2-P1/lib/dns/rbtdb.c 2009-11-19 00:41:18.000000000 +0100
@@ -3565,7 +3565,7 @@
}
if (dname_header != NULL &&
- (dname_header->trust != dns_trust_pending ||
+ (!DNS_TRUST_PENDING(dname_header->trust) ||
(search->options & DNS_DBFIND_PENDINGOK) != 0)) {
/*
* We increment the reference count on node to ensure that
@@ -4108,7 +4108,7 @@
if (found == NULL ||
(found->trust == dns_trust_glue &&
((options & DNS_DBFIND_GLUEOK) == 0)) ||
- (found->trust == dns_trust_pending &&
+ (DNS_TRUST_PENDING(found->trust) &&
((options & DNS_DBFIND_PENDINGOK) == 0))) {
/*
* If there is an NS rdataset at this node, then this is the
diff -uNr bind-9.5.2/lib/dns/resolver.c bind-9.5.2-P1/lib/dns/resolver.c
--- bind-9.5.2/lib/dns/resolver.c 2009-08-13 06:54:21.000000000 +0200
+++ bind-9.5.2-P1/lib/dns/resolver.c 2009-11-19 00:41:18.000000000 +0100
@@ -4243,6 +4243,7 @@
* for it, unless it is glue.
*/
if (secure_domain && rdataset->trust != dns_trust_glue) {
+ dns_trust_t trust;
/*
* RRSIGs are validated as part of validating the
* type they cover.
@@ -4279,12 +4280,34 @@
}
/*
+ * Reject out of bailiwick additional records
+ * without RRSIGs as they can't possibly validate
+ * as "secure" and as we will never never want to
+ * store these as "answers" after validation.
+ */
+ if (rdataset->trust == dns_trust_additional &&
+ sigrdataset == NULL && EXTERNAL(rdataset))
+ continue;
+
+ /*
+ * XXXMPA: If we store as "answer" after validating
+ * then we need to do bailiwick processing and
+ * also need to track whether RRsets are in or
+ * out of bailiwick. This will require a another
+ * pending trust level.
+ *
* Cache this rdataset/sigrdataset pair as
- * pending data.
+ * pending data. Track whether it was additional
+ * or not.
*/
- rdataset->trust = dns_trust_pending;
+ if (rdataset->trust == dns_trust_additional)
+ trust = dns_trust_pending_additional;
+ else
+ trust = dns_trust_pending_answer;
+
+ rdataset->trust = trust;
if (sigrdataset != NULL)
- sigrdataset->trust = dns_trust_pending;
+ sigrdataset->trust = trust;
if (!need_validation)
addedrdataset = ardataset;
else
@@ -4632,7 +4655,7 @@
for (trdataset = ISC_LIST_HEAD(tname->list);
trdataset != NULL;
trdataset = ISC_LIST_NEXT(trdataset, link))
- trdataset->trust = dns_trust_pending;
+ trdataset->trust = dns_trust_pending_answer;
result = dns_message_nextname(fctx->rmessage,
DNS_SECTION_AUTHORITY);
}
diff -uNr bind-9.5.2/lib/dns/validator.c bind-9.5.2-P1/lib/dns/validator.c
--- bind-9.5.2/lib/dns/validator.c 2009-03-18 00:46:41.000000000 +0100
+++ bind-9.5.2-P1/lib/dns/validator.c 2009-11-19 00:41:18.000000000 +0100
@@ -1189,7 +1189,7 @@
* We have an rrset for the given keyname.
*/
val->keyset = &val->frdataset;
- if (val->frdataset.trust == dns_trust_pending &&
+ if (DNS_TRUST_PENDING(val->frdataset.trust) &&
dns_rdataset_isassociated(&val->fsigrdataset))
{
/*
@@ -1204,7 +1204,7 @@
if (result != ISC_R_SUCCESS)
return (result);
return (DNS_R_WAIT);
- } else if (val->frdataset.trust == dns_trust_pending) {
+ } else if (DNS_TRUST_PENDING(val->frdataset.trust)) {
/*
* Having a pending key with no signature means that
* something is broken.
@@ -1825,7 +1825,7 @@
* We have DS records.
*/
val->dsset = &val->frdataset;
- if (val->frdataset.trust == dns_trust_pending &&
+ if (DNS_TRUST_PENDING(val->frdataset.trust) &&
dns_rdataset_isassociated(&val->fsigrdataset))
{
result = create_validator(val,
@@ -1838,7 +1838,7 @@
if (result != ISC_R_SUCCESS)
return (result);
return (DNS_R_WAIT);
- } else if (val->frdataset.trust == dns_trust_pending) {
+ } else if (DNS_TRUST_PENDING(val->frdataset.trust)) {
/*
* There should never be an unsigned DS.
*/
@@ -2692,7 +2692,7 @@
* There is no DS. If this is a delegation,
* we maybe done.
*/
- if (val->frdataset.trust == dns_trust_pending) {
+ if (DNS_TRUST_PENDING(val->frdataset.trust)) {
result = create_fetch(val, tname,
dns_rdatatype_ds,
dsfetched2,
