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Test zone with truncated revoked DNSKEY

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Ensure that named can handle a situation where the zone is signed with a
truncated, self-signed revoked DNSKEY. The signatures are inevitably
bogus and a SERVFAIL is expected. However, prior to CVE-2025-8677 fix,
this could trigger an assertion failure.
This commit is contained in:
Nicki Křížek 2025-10-13 18:35:33 +02:00
parent 1a2e46d364
commit 0ddfa108a7
5 changed files with 67 additions and 0 deletions
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5
bin/tests/system/dnssec-malformed-dnskey/ns2/named.conf.j2
View file

@ -34,4 +34,9 @@ zone example. {
file "example.db.signed.malformed";
};
zone truncated.selfsigned. {
type primary;
file "truncated.selfsigned.db.signed";
};
include "trusted.conf";

40
bin/tests/system/dnssec-malformed-dnskey/ns2/truncated.selfsigned.db.signed Normal file
View file

@ -0,0 +1,40 @@
; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
;
; SPDX-License-Identifier: MPL-2.0
;
; This Source Code Form is subject to the terms of the Mozilla Public
; License, v. 2.0. If a copy of the MPL was not distributed with this
; file, you can obtain one at https://mozilla.org/MPL/2.0/.
;
; See the COPYRIGHT file distributed with this work for additional
; information regarding copyright ownership.
$TTL 300
@ IN SOA mname1. . (
1 ; serial
600 ; refresh
600 ; retry
1200 ; expire
600 ; minimum
)
@ NS @
@ A 10.53.0.2
; The following DNSKEY is revoked and truncated. To trigger the test
; condition, its key tag must be marked as trusted by the resolver.
; Since the key isn't valid, all the RRSIGs in this file are bogus.
@ DNSKEY 385 3 14 fQA=
@ RRSIG SOA 14 2 86400 20950926153053 20251013153053 33167 @ xxxx5f7U0DiPvKFxpB83mTyqkAO0TfM0 xe4ZMYoJUQEPYdd0GTNkFzI6crsbU0lQ t/V1YOxAt5B+T1ch9n5dhYwt7ZTqluI2 mr6myKMesdPl1zp1hEgkmFpCG3NOXl2Z
@ RRSIG NS 14 2 86400 20950926153053 20251013153053 33167 @ xxxxLBPc05g7v/K5UfGuXsHH8xd29eQb 5qWe+Ei4Qn0GlmH0x/VIJiJMZXuxD5S+ VhP7DiX7uKIxi0QS2DOK1aOMXq/2WiUV 2VBmYAoSUilMlJY84I2XbzqD5iz5y+yp
@ RRSIG A 14 2 86400 20950926153053 20251013153053 33167 @ xxxx6UguMh8jgdVox2UVURjEsAP0D8o2 mFofnFOd6eYf+49QlWD+GX6x60X/hPVi f2XFsajouCvT/ZSmoXKWad3RC1DLHF/H TdOGMKlT4DfvbeJV+N5N0bgu2Wv3QRdM
@ RRSIG DNSKEY 14 2 86400 20950926153053 20251013153053 33167 @ xxxxqayRNsL32Km0c9AjwN0RNktt4iGb 97Dwi0uiHPcM4eVNZR2w68XMUh43+nR1 DA1QE2RqIqt7soEIwi1z4kAczf7W1wrP 7dcbEwjxS9D1CefuNRG1xnj9wGsqKecI
@ NSEC a A NS SOA RRSIG NSEC DNSKEY
@ RRSIG NSEC 14 2 0 20950926153053 20251013153053 33167 @ xxxx4Y6vqeOJHWEeg0T0OY4z7BdDrTkn BY9Yra8zSjFEGZvIX3irPd81+u5xlA0T 9waJO2Y9W42IMrOeKdQt++QXVHsLhOYn 4NAF6RotHSb4cqv1DXI1PSchMaJ5FWwD
a A 10.53.0.2
a RRSIG A 14 3 86400 20950926153053 20251013153053 33167 @ xxxxv31CNatB9xzj3AfTMlwiO0OqxbpJ cWrHN8zjj1ScXpqrHITfG/CZpoECDLWF wkXshDB/QMxHrnXkPKEcR2c9o5tcQT5R nHvtr7HT4Ob5PcY5DnItf3OWhE+bocmW
a NSEC @ A RRSIG NSEC
a RRSIG NSEC 14 3 0 20950926153053 20251013153053 33167 @ xxxxwMWbUxb3ScBKEVheQ2wFqujc6cyt 28GVCU0wPrBpK72HSsgdYme7IG8ZXGfa IWSU1Kf/om5+El7Tf2vDs7aI1yI7e7YG D5IxMejQg5v3/wtP7AJZXP5K9ICjq/ph

11
bin/tests/system/dnssec-malformed-dnskey/ns2/trusted.conf.j2
View file

@ -13,4 +13,15 @@
trust-anchors {
example. static-key 257 3 14 "@ksk_public_key@";
/*
* The key tag in the trust anchor must match that of the revoked
* truncated self-signed key in the truncated.selfsigned. zone.
*
* The DNSKEY contents are intentionally different here, because the
* key doesn't have the revoked bit here and that flag is part of the
* key tag. The following decodes to key tag 33167, which is the same
* as the revoked truncated key in the zone file.
*/
truncated.selfsigned. static-key 257 3 14 "fYA=";
};

5
bin/tests/system/dnssec-malformed-dnskey/ns3/named.conf.j2
View file

@ -31,4 +31,9 @@ zone "example." {
server-addresses { 10.53.0.2; };
};
zone "truncated.selfsigned." {
type static-stub;
server-addresses { 10.53.0.2; };
};
include "trusted.conf";

6
bin/tests/system/dnssec-malformed-dnskey/tests_malformed_dnskey.py
View file

@ -180,3 +180,9 @@ def test_multiple_rrsigs(ns3):
res = isctest.query.tcp(msg, "10.53.0.3")
isctest.check.servfail(res)
def test_truncated_dnskey():
msg = isctest.query.create("a.truncated.selfsigned.", "A")
res = isctest.query.tcp(msg, "10.53.0.3")
isctest.check.servfail(res)