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Merge branch 'security-dlz-axfr-deny-broken' into security-master

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denied axfr requests were not effective for writable DLZ zones

See merge request isc-private/bind9!57
This commit is contained in:
Evan Hunt 2019-02-06 11:36:54 -08:00
commit 8514320271
5 changed files with 42 additions and 12 deletions
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4
CHANGES
View file

@ -87,7 +87,9 @@
and "nsdname-enable" both now default to yes,
regardless of compile-time settings. [GL #824]
5141. [placeholder]
5141. [security] Zone transfer controls for writable DLZ zones were
not effective as the allowzonexfr method was not being
called for such zones. (CVE-2019-6465) [GL #790]
5140. [bug] Don't immediately mark existing keys as inactive and
deleted when running dnssec-keymgr for the first

18
bin/tests/system/dlzexternal/driver.c
View file

@ -536,10 +536,22 @@ dlz_lookup(const char *zone, const char *name, void *dbdata,
*/
isc_result_t
dlz_allowzonexfr(void *dbdata, const char *name, const char *client) {
UNUSED(client);
isc_result_t result;
/* Just say yes for all our zones */
return (dlz_findzonedb(dbdata, name, NULL, NULL));
result = dlz_findzonedb(dbdata, name, NULL, NULL);
if (result != ISC_R_SUCCESS) {
return (result);
}
/*
* Exception for 10.53.0.5 so we can test that allow-transfer
* is effective.
*/
if (strcmp(client, "10.53.0.5") == 0) {
return (ISC_R_NOPERM);
}
return (ISC_R_SUCCESS);
}
/*

16
bin/tests/system/dlzexternal/tests.sh
View file

@ -108,15 +108,23 @@ test_update testdc1.alternate.nil. A "86400 A 10.53.0.10" "10.53.0.10" || ret=1
status=`expr $status + $ret`
newtest "testing AXFR from DLZ drivers"
$DIG $DIGOPTS +noall +answer axfr example.nil > dig.out.ns1.test$n
lines=`cat dig.out.ns1.test$n | wc -l`
$DIG $DIGOPTS +noall +answer axfr example.nil > dig.out.example.ns1.test$n
lines=`cat dig.out.example.ns1.test$n | wc -l`
[ ${lines:-0} -eq 4 ] || ret=1
$DIG $DIGOPTS +noall +answer axfr alternate.nil > dig.out.ns1.test$n
lines=`cat dig.out.ns1.test$n | wc -l`
$DIG $DIGOPTS +noall +answer axfr alternate.nil > dig.out.alternate.ns1.test$n
lines=`cat dig.out.alternate.ns1.test$n | wc -l`
[ ${lines:-0} -eq 5 ] || ret=1
[ "$ret" -eq 0 ] || echo_i "failed"
status=`expr $status + $ret`
newtest "testing AXFR denied from DLZ drivers"
$DIG $DIGOPTS -b 10.53.0.5 +noall +answer axfr example.nil > dig.out.example.ns1.test$n
grep "; Transfer failed" dig.out.example.ns1.test$n > /dev/null || ret=1
$DIG $DIGOPTS -b 10.53.0.5 +noall +answer axfr alternate.nil > dig.out.alternate.ns1.test$n
grep "; Transfer failed" dig.out.alternate.ns1.test$n > /dev/null || ret=1
[ "$ret" -eq 0 ] || echo_i "failed"
status=`expr $status + $ret`
newtest "testing unsearched/unregistered DLZ zone is not found"
$DIG $DIGOPTS +noall +answer ns other.nil > dig.out.ns1.test$n
grep "3600.IN.NS.other.nil." dig.out.ns1.test$n > /dev/null && ret=1

8
doc/arm/notes.xml
View file

@ -157,6 +157,14 @@
[GL #772]
</para>
</listitem>
<listitem>
<para>
Zone transfer controls for writable DLZ zones were not
effective as the <command>allowzonexfr</command> method was
not being called for such zones. This flaw is disclosed in
CVE-2019-6465. [GL #790]
</para>
</listitem>
</itemizedlist>
</section>

8
lib/ns/xfrout.c
View file

@ -817,12 +817,12 @@ ns_xfr_start(ns_client_t *client, dns_rdatatype_t reqtype) {
result = dns_zt_find(client->view->zonetable, question_name, 0, NULL,
&zone);
if (result != ISC_R_SUCCESS) {
if (result != ISC_R_SUCCESS || dns_zone_gettype(zone) == dns_zone_dlz) {
/*
* Normal zone table does not have a match.
* Try the DLZ database
* The normal zone table does not have a match, or this is
* marked in the zone table as a DLZ zone. Check the DLZ
* databases for a match.
*/
// Temporary: only searching the first DLZ database
if (! ISC_LIST_EMPTY(client->view->dlz_searched)) {
result = dns_dlzallowzonexfr(client->view,
question_name,