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bind/bin/tests/system/dnssec/tests_validation.py
Ondřej Surý a3c338ae69
Add a test for non-existence of RRSIG in the unsigned zone 
This tests that the result is NOERROR and a single SOA record is
returned.
2025-08-21 15:26:43 +02:00

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# 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.
import os
import re
import shutil
import time
from dns import edns, flags, name, rdataclass, rdatatype
import pytest
import isctest
import isctest.mark
from isctest.util import param
pytest.importorskip("dns", minversion="2.0.0")
pytestmark = pytest.mark.extra_artifacts(
[
"*/K*",
"*/dsset-*",
"*/*.bk",
"*/*.conf",
"*/*.db",
"*/*.id",
"*/*.jnl",
"*/*.jbk",
"*/*.key",
"*/*.signed",
"*/settime.out.*",
"ans*/ans.run",
"*/trusted.keys",
"*/*.bad",
"*/*.next",
"*/*.stripped",
"*/*.tmp",
"*/*.stage?",
"*/*.patched",
"*/*.lower",
"*/*.upper",
"*/*.unsplit",
]
)
# helper functions
def grep_q(regex, filename):
with open(filename, "r", encoding="utf-8") as f:
blob = f.read().splitlines()
results = [x for x in blob if re.search(regex, x)]
return len(results) != 0
def getfrom(file):
with open(file, encoding="utf-8") as f:
return f.read().strip()
@pytest.mark.requires_zones_loaded("ns2", "ns3")
@pytest.mark.parametrize(
"qname, qtype",
[
param("a.example.", "A"),
param("rfc2535.example.", "SOA"),
],
)
def test_load_transfer(qname, qtype):
# check that we can load and transfer zone
msg = isctest.query.create(qname, qtype)
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.3")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res1)
def test_insecure_glue():
# check that for a query against a validating resolver where the
# authoritative zone is unsigned (insecure delegation), glue is returned
# in the additional section
msg = isctest.query.create("a.insecure.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.authority, 1)
isctest.check.rr_count_eq(res.additional, 1)
assert str(res.additional[0].name) == "ns3.insecure.example."
addrs = [str(a) for a in res.additional[0]]
assert "10.53.0.3" in addrs
def test_insecure_rrsig():
# check that for a rrsig query against a validating resolver where the
# authoritative zone is unsigned (insecure delegation), noerror is
# returned.
msg = isctest.query.create("a.insecure.example", "RRSIG")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 0)
isctest.check.rr_count_eq(res.authority, 1)
isctest.check.rr_count_eq(res.additional, 0)
assert str(res.authority[0].name) == "insecure.example."
assert res.authority[0].rdtype == rdatatype.SOA
def test_adflag():
# compare auth and recursive answers
msg = isctest.query.create("a.example", "A", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
# check no AD flag in authoritative response
isctest.check.noadflag(res1)
# check validating resolver sends AD=1 if the client sent AD=1
isctest.check.adflag(res2)
# check that AD=0 unless the client sent AD=1
msg = isctest.query.create("a.example", "A", dnssec=False, ad=False)
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noadflag(res2)
def test_secure_root(ns4):
# check that a query for a secure root validates
msg = isctest.query.create(".", "KEY")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
# check that "rndc secroots" dumps the trusted keys
key = int(getfrom("ns1/managed.key.id"))
alg = os.environ["DEFAULT_ALGORITHM"]
expected = f"./{alg}/{key} ; static"
response = ns4.rndc("secroots -", log=False).splitlines()
assert expected in response
assert len(response) == 10
def test_positive_validation_nsec():
# positive answer
msg = isctest.query.create("a.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# wildcard
msg = isctest.query.create("a.wild.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
assert str(res2.authority[0].name) == "*.wild.example."
assert res2.authority[0].rdtype == rdatatype.NSEC
nsecs = [str(a).split(" ", maxsplit=1)[0] for a in res2.authority[0]]
assert "z.example." in nsecs
assert res2.authority[1].rdtype == rdatatype.RRSIG
assert res2.authority[1].covers == rdatatype.NSEC
# mixed case
for rrtype in ["a", "txt", "aaaa", "loc"]:
msg = isctest.query.create("mixedcase.secure.example", rrtype)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
def test_positive_validation_nsec3():
# positive answer
msg = isctest.query.create("a.nsec3.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
# wildcard
msg = isctest.query.create("a.wild.nsec3.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
isctest.check.rr_count_eq(res2.authority, 4)
# unknown NSEC3 hash algorithm
msg = isctest.query.create("nsec3-unknown.example", "SOA", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
isctest.check.rr_count_eq(res2.answer, 1)
def test_positive_validation_optout():
# positive answer
msg = isctest.query.create("a.optout.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# wildcard
msg = isctest.query.create("a.wild.optout.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# unknown NSEC3 hash algorithm
msg = isctest.query.create("optout-unknown.example", "SOA", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
isctest.check.rr_count_eq(res2.answer, 1)
def answer_has(r, rdtype):
return bool([r for r in r.answer if r.rdtype == rdtype])
def test_chain_validation():
# check validation of ANY response
msg = isctest.query.create("foo.example", "ANY")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.rr_count_eq(res2.answer, 6) # 2 records, 1 NSEC, 3 RRSIGs
# check validation of CNAME response
msg = isctest.query.create("cname1.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.rr_count_eq(res2.answer, 4) # CNAME, TXT, 2 RRSIGs
# check validation of DNAME response
msg = isctest.query.create("foo.dname1.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.rr_count_eq(res2.answer, 5) # DNAME, TXT, 2 RRSIGs, synth CNAME
# check validation of CNAME response to ANY query
msg = isctest.query.create("cname2.example", "ANY")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.rr_count_eq(res2.answer, 4) # CNAME, NSEC, 2 RRSIGs
# check validation of DNAME response to ANY query
msg = isctest.query.create("foo.dname2.example", "ANY")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.rr_count_eq(res2.answer, 3) # DNAME, RSRIG, synth CNAME
# check bad CNAME signature is caught after +CD query
msg = isctest.query.create("bad-cname.example", "A", dnssec=False, cd=True)
# query once with CD to prime the cache
res = isctest.query.tcp(msg, "10.53.0.4")
# query again with CD, bogus pending data should be returned
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
assert "a.example." in str(res.answer[0])
assert "10.0.0.1" in str(res.answer[1])
# query again without CD, bogus data should be rejected
msg = isctest.query.create("bad-cname.example", "A", dnssec=False)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
# check bad DNAME signature is caught after +CD query
msg = isctest.query.create("a.bad-dname.example", "A", dnssec=False, cd=True)
# query once with CD to prime the cache
res = isctest.query.tcp(msg, "10.53.0.4")
# query again with CD, bogus pending data should be returned
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
assert "example." in str(res.answer[0])
assert "a.example." in str(res.answer[1])
assert "10.0.0.1" in str(res.answer[2])
# query again without CD, bogus data should be rejected
msg = isctest.query.create("a.bad-dname.example", "A", dnssec=False)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
# check DNSKEY lookup via CNAME
msg = isctest.query.create("cnameandkey.secure.example", "DNSKEY")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
assert answer_has(res2, rdatatype.CNAME)
# check KEY lookup via CNAME
msg = isctest.query.create("cnameandkey.secure.example", "KEY")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
assert not answer_has(res2, rdatatype.CNAME)
# check KEY lookup via CNAME (not present)
msg = isctest.query.create("cnamenokey.secure.example", "KEY")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
assert not answer_has(res2, rdatatype.CNAME)
# check DNSKEY lookup via DNAME
msg = isctest.query.create("a.dnameandkey.secure.example", "DNSKEY")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
assert answer_has(res2, rdatatype.DNAME)
# check KEY lookup via DNAME
msg = isctest.query.create("a.dnameandkey.secure.example", "KEY")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
assert answer_has(res2, rdatatype.DNAME)
@isctest.mark.rsasha1
def test_signing_algorithms_rsasha1():
# rsasha1 (should work with FIPS mode we're as only validating)
msg = isctest.query.create("a.rsasha1.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# rsasha1 (1024 bits) NSEC
msg = isctest.query.create("a.rsasha1-1024.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
def test_signing_algorithms():
# rsasha256
msg = isctest.query.create("a.rsasha256.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# rsasha512
msg = isctest.query.create("a.rsasha512.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# KSK-only DNSKEY
msg = isctest.query.create("a.kskonly.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
def test_private_algorithms(ns4):
# positive answer, private algorithm
msg = isctest.query.create("a.rsasha256oid.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# positive answer, unknown private algorithm
msg = isctest.query.create("a.unknownoid.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noadflag(res2)
# positive answer, extra ds for private algorithm
msg = isctest.query.create("a.extradsoid.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# positive anwer, extra ds for unknown private algorithm
with ns4.watch_log_from_here() as watcher:
msg = isctest.query.create("a.extradsunknownoid.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.servfail(res2)
watcher.wait_for_line(
"No DNSKEY for extradsunknownoid.example/DS with PRIVATEOID"
)
@isctest.mark.extended_ds_digest
def test_private_algorithms_extended_ds():
# check positive validation with extra ds using extended digest
# type for unknown private algorithm
msg = isctest.query.create("a.extended-ds-unknown-oid.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
def test_negative_validation_nsec():
# nxdomain
msg = isctest.query.create("q.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.adflag(res2)
# nodata
msg = isctest.query.create("a.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.empty_answer(res2)
isctest.check.adflag(res2)
# negative wildcard
msg = isctest.query.create("b.wild.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
def test_negative_validation_nsec3():
# nxdomain
msg = isctest.query.create("q.nsec3.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.adflag(res2)
# nodata
msg = isctest.query.create("a.nsec3.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.empty_answer(res2)
isctest.check.adflag(res2)
# negative wildcard
msg = isctest.query.create("b.wild.nsec3.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
# check NSEC3 zone with mismatched NSEC3PARAM / NSEC parameters
msg = isctest.query.create("non-exist.badparam", "A")
res = isctest.query.tcp(msg, "10.53.0.2")
isctest.check.nxdomain(res)
# check negative unknown NSEC3 hash algorithm does not validate
msg = isctest.query.create("nsec3-unknown.example", "A", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.servfail(res2)
def test_excessive_nsec3_iterations():
assert grep_q(
"zone too-many-iterations/IN: excessive NSEC3PARAM iterations", "ns2/named.run"
)
assert grep_q(
"zone too-many-iterations/IN: excessive NSEC3PARAM iterations", "ns3/named.run"
)
# check fallback to insecure with NSEC3 iterations is too high
msg = isctest.query.create("does-not-exist.too-many-iterations", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noadflag(res2)
isctest.check.rr_count_eq(res2.answer, 0)
isctest.check.rr_count_eq(res2.authority, 8)
# check fallback to insecure with NSEC3 iterations is too high (nodata)
msg = isctest.query.create("a.too-many-iterations", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noadflag(res2)
isctest.check.rr_count_eq(res2.answer, 0)
isctest.check.rr_count_eq(res2.authority, 4)
# check fallback to insecure with NSEC3 iterations is too high (wildcard)
msg = isctest.query.create("wild.a.too-many-iterations", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noadflag(res2)
isctest.check.rr_count_eq(res2.answer, 2)
isctest.check.rr_count_eq(res2.authority, 4)
a, _ = res2.answer
assert str(a.name) == "wild.a.too-many-iterations."
assert str(a[0]) == "10.0.0.3"
# check fallback to insecure with high NSEC3 iterations (wildcard nodata)
msg = isctest.query.create("wild.a.too-many-iterations", 100)
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noadflag(res2)
isctest.check.rr_count_eq(res2.authority, 8)
def test_auth_nsec3():
# nxdomain response, closest encloser with 0 empty non-terminals
msg = isctest.query.create("b.b.b.b.b.a.nsec3.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res)
# closest encloser (a.nsec3.example):
rrset = res.get_rrset(
res.authority,
name.from_text("6OVDUHTN094ML2PV8AN90U0DPU823GH2.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "NSEC3 missing from AUTHORITY: " + str(res)
assert "7AT0S0RIDCJRFF2M5H5AAV22CSFJBUL4" in str(rrset[0]).upper()
# no QNAME (b.a.nsec3.example/DSPF4R9UKOEPJ9O34E1H4539LSOTL14E)
rrset = res.get_rrset(
res.authority,
name.from_text("BEJ5GMQA872JF4DAGQ0R3O5Q7A2O5S9L.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "EF2S05SGK1IR2K5SKMFIRERGQCLMR18M" in str(rrset[0]).upper()
# no WILDCARD (*.a.nsec3.example/TFGQ60S97BS31IT1EBEDO63ETM0T5JFA)
rrset = res.get_rrset(
res.authority,
name.from_text("R8EVDMNIGNOKME4LH2H90OSP2PRSNJ1Q.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "VH656EQUD4J02OFVSO4GKOK5D02MS1TL" in str(rrset[0]).upper()
# nxdomain response, closest encloser with 1 ENT
msg = isctest.query.create("b.b.b.b.b.a.a.nsec3.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res)
# closest encloser (a.a.nsec3.example):
rrset = res.get_rrset(
res.authority,
name.from_text("NGCJFSOLJUUE27PFNQNJIME4TQ0OU2DH.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "R8EVDMNIGNOKME4LH2H90OSP2PRSNJ1Q" in str(rrset[0]).upper()
# noqname (b.a.a.nsec3.example):
rrset = res.get_rrset(
res.authority,
name.from_text("R8EVDMNIGNOKME4LH2H90OSP2PRSNJ1Q.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "VH656EQUD4J02OFVSO4GKOK5D02MS1TL" in str(rrset[0]).upper()
# no wildcard (*.a.a.nsec3.example/V7JNNDJ4NLRIU195FRB7DLUCSLU4LLFM)
# is covered by the noqname proof in this case
# nxdomain response, closest encloser with 2 ENTs
msg = isctest.query.create("b.b.b.b.b.a.a.a.nsec3.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res)
# closest encloser (a.a.a.nsec3.example):
rrset = res.get_rrset(
res.authority,
name.from_text("H7RHPDCHSVVRAND332F878C8AB6IBJQV.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "K8IG76R2UPQ13IKFO49L7IB9JRVB6QJI" in str(rrset[0]).upper()
# noqname (b.a.a.a.nsec3.example/18Q8D89RM8GGRSSOPFRB05QS6VEGB1P4)
rrset = res.get_rrset(
res.authority,
name.from_text("0T7VH688AEK0612T69V8692OCMJD50M4.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "1HARMGSKJH0EBU2EI2OJIKTDPIQA6KBI" in str(rrset[0]).upper()
# no WILDCARD (*.a.a.a.nsec3.example/8113LDMSEFPUAG4VGFF1C8KLOUT4Q6PH)
rrset = res.get_rrset(
res.authority,
name.from_text("7AT0S0RIDCJRFF2M5H5AAV22CSFJBUL4.nsec3.example."),
rdataclass.IN,
rdatatype.NSEC3,
)
assert rrset, "expected NSEC3 missing from AUTHORITY: " + str(res)
assert "BEJ5GMQA872JF4DAGQ0R3O5Q7A2O5S9L" in str(rrset[0]).upper()
def test_negative_validation_optout():
# nxdomain
msg = isctest.query.create("q.optout.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# nodata
msg = isctest.query.create("a.optout.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.empty_answer(res2)
isctest.check.adflag(res2)
# negative wildcard
msg = isctest.query.create("b.wild.optout.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# empty NODATA
msg = isctest.query.create("empty.optout.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# (rt22007 regression tests:)
# check optout NSEC3 referral with only insecure delegatons
msg = isctest.query.create("delegation.single-nsec3", "A")
res = isctest.query.tcp(msg, "10.53.0.2")
isctest.check.noerror(res)
for rrset in res.authority:
if (
rrset.rdtype != rdatatype.NSEC3
or "3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" not in rrset.name
):
continue
assert "1 1 1 - 3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" in str(rrset[0])
# check optout NSEC3 NXDOMAIN with only insecure delegatons
msg = isctest.query.create("nonexist.single-nsec3", "A")
res = isctest.query.tcp(msg, "10.53.0.2")
isctest.check.nxdomain(res)
for rrset in res.authority:
if (
rrset.rdtype != rdatatype.NSEC3
or "3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" not in rrset.name
):
continue
assert "1 1 1 - 3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" in str(rrset[0])
# check optout NSEC3 NODATA with only insecure delegatons
msg = isctest.query.create("single-nsec3", "A")
res = isctest.query.tcp(msg, "10.53.0.2")
isctest.check.noerror(res)
for rrset in res.authority:
if (
rrset.rdtype != rdatatype.NSEC3
or "3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" not in rrset.name
):
continue
assert "1 1 1 - 3KL3NK1HKQ4IUEEHBEF12VGFKUETNBAN" in str(rrset[0])
# check negative unknown NSEC3-OPTOUT hash algorithm does not validate
msg = isctest.query.create("optout-unknown.example", "A", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.servfail(res2)
def test_cache(ns4):
# check that key id's are logged when dumping the cache
ns4.rndc("dumpdb -cache", log=False)
assert grep_q("; key id = ", "ns4/named_dump.db")
# check for RRSIG covered type in negative cache
assert grep_q("; example. RRSIG NSEC ", "ns4/named_dump.db")
# check validated data are not cached longer than originalttl
msg = isctest.query.create("a.ttlpatch.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.rr_count_eq(res1.answer, 2)
isctest.check.rr_count_eq(res2.answer, 2)
for rrset in res1.answer:
assert 3000 <= rrset.ttl <= 3600
for rrset in res2.answer:
assert rrset.ttl <= 300
# query for a record, then follow it with a query for the
# corresponding RRSIG, check that it's answered from the cache
msg = isctest.query.create("normalthenrrsig.secure.example", "A")
isctest.query.tcp(msg, "10.53.0.4")
msg = isctest.query.create("normalthenrrsig.secure.example", "RRSIG")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.raflag(res2)
# check direct query for RRSIG: if it's not cached with other records,
# it should result in an empty response.
msg = isctest.query.create("rrsigonly.secure.example", "RRSIG")
res1 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.empty_answer(res1)
isctest.check.noraflag(res1)
# check that a DNSKEY query with no data still gets cached
msg = isctest.query.create("insecure.example", "DNSKEY")
res1 = isctest.query.tcp(msg, "10.53.0.4")
time.sleep(1) # give the TTL time to change
res2 = isctest.query.tcp(msg, "10.53.0.4")
if res1.authority[0].ttl == res2.authority[0].ttl:
time.sleep(1)
res2 = isctest.query.tcp(msg, "10.53.0.4")
assert res1.authority[0].ttl != res2.authority[0].ttl
def test_insecure_proof_nsec(ns4):
# 1-server positive
msg = isctest.query.create("a.insecure.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# 1-server negative
msg = isctest.query.create("q.insecure.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# 1-server negative with SOA hack
msg = isctest.query.create("r.insecure.example", "SOA")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
assert res2.authority[0].rdtype == rdatatype.SOA
assert res2.authority[0].ttl == 0
# 2-server positive
msg = isctest.query.create("a.insecure.secure.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# 2-server negative
msg = isctest.query.create("q.insecure.secure.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# 2-server negative with SOA hack
msg = isctest.query.create("r.insecure.secure.example", "SOA")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# insecurity proof using negative cache
ns4.rndc("flush", log=False)
msg = isctest.query.create("insecure.example", "DS", cd=True)
isctest.query.tcp(msg, "10.53.0.4")
def query_and_check_nxdomain():
msg = isctest.query.create("nonexistent.insecure.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res)
return True
isctest.run.retry_with_timeout(query_and_check_nxdomain, 20)
# check insecure negative response with an unsigned NSEC
# first try the auth server...
msg = isctest.query.create("nsec-rrsigs-stripped", "TXT")
res1 = isctest.query.udp(msg, "10.53.0.10")
isctest.check.noerror(res1)
isctest.check.empty_answer(res1)
isctest.check.rr_count_eq(res1.authority, 2)
isctest.check.rr_count_eq(res1.additional, 0)
# make sure there's no RRSIG(NSEC)
for rrset in res1.authority:
assert rrset.rdtype != rdatatype.RRSIG or rrset.covers != rdatatype.NSEC
# now try the resolver
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noadflag(res2)
def test_insecure_proof_nsec3():
# 1-server
msg = isctest.query.create("a.insecure.nsec3.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# 1-server negative
msg = isctest.query.create("q.insecure.nsec3.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# 1-server negative with SOA hack
msg = isctest.query.create("r.insecure.nsec3.example", "SOA")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
assert res2.authority[0].rdtype == rdatatype.SOA
assert res2.authority[0].ttl == 0
def test_insecure_proof_optout():
# 1-server
msg = isctest.query.create("a.insecure.optout.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# 1-server negative
msg = isctest.query.create("q.insecure.optout.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
# 1-server negative with SOA hack
msg = isctest.query.create("r.insecure.optout.example", "SOA")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_data(res1, res2)
isctest.check.nxdomain(res2)
isctest.check.noadflag(res2)
assert res2.authority[0].rdtype == rdatatype.SOA
assert res2.authority[0].ttl == 0
def test_below_cname():
# check insecure zone below a cname resolves
msg = isctest.query.create("insecure.below-cname.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.noadflag(res)
isctest.check.rr_count_eq(res.answer, 1)
# check secure zone below a cname resolves and validates
msg = isctest.query.create("secure.below-cname.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
isctest.check.rr_count_eq(res.answer, 2)
@pytest.mark.parametrize(
"qname",
[
"a.secure.example", # NSEC/NSEC
"a.nsec3.example", # NSEC/NSEC3
"a.optout.example", # NSEC/OPTOUT
"a.secure.nsec3.example", # NSEC3/NSEC
"a.nsec3.nsec3.example", # NSEC3/NSEC3
"a.optout.nsec3.example", # NSEC3/OPTOUT
"a.secure.optout.example", # OPTOUT/NSEC
"a.nsec3.optout.example", # OPTOUT/NSEC3
"a.optout.optout.example", # OPTOUT/OPTOUT
],
)
def test_positive_validation_multistage(qname):
msg = isctest.query.create(qname, "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.noerror(res2)
isctest.check.adflag(res2)
def test_validation_recovery(ns2, ns4):
# check recovery from spoofed server address.
# prime cache with spoofed address records...
msg = isctest.query.create("target.peer-ns-spoof", "A", cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
ns4.rndc("dumpdb", log=False)
grep_q("10.53.0.100", "ns4/named_dump.db")
# then reload server with properly signed zone
shutil.copyfile(
"ns2/peer.peer-ns-spoof.db.next", "ns2/peer.peer-ns-spoof.db.signed"
)
with ns2.watch_log_from_here() as watcher:
ns2.rndc("reload peer.peer-ns-spoof", log=False)
watcher.wait_for_line("zone peer.peer-ns-spoof/IN: loaded serial 2000042408")
# and check we can resolve with the correct server address
msg = isctest.query.create("test.target.peer-ns-spoof", "TXT")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res)
isctest.check.adflag(res)
# check recovery from stripped DNSKEY RRSIG.
# prime cache with spoofed address records...
msg = isctest.query.create("dnskey-rrsigs-stripped", "DNSKEY", cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 2)
# then reload server with properly signed zone
shutil.copyfile(
"ns2/dnskey-rrsigs-stripped.db.next", "ns2/dnskey-rrsigs-stripped.db.signed"
)
with ns2.watch_log_from_here() as watcher:
ns2.rndc("reload dnskey-rrsigs-stripped", log=False)
watcher.wait_for_line(
"zone dnskey-rrsigs-stripped/IN: loaded serial 2000042408"
)
# and check we can now resolve with the correct server address
msg = isctest.query.create("b.dnskey-rrsigs-stripped", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# check recovery from stripped DS RRSIG.
# prime cache with spoofed address records...
msg = isctest.query.create("child.ds-rrsigs-stripped", "DS", cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 1)
# then reload server with properly signed zone
shutil.copyfile(
"ns2/ds-rrsigs-stripped.db.next", "ns2/ds-rrsigs-stripped.db.signed"
)
with ns2.watch_log_from_here() as watcher:
ns2.rndc("reload ds-rrsigs-stripped", log=False)
watcher.wait_for_line("zone ds-rrsigs-stripped/IN: loaded serial 2000042408")
# and check we can now resolve with the correct server address
msg = isctest.query.create("b.child.ds-rrsigs-stripped", "A")
res1 = isctest.query.tcp(msg, "10.53.0.2")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.same_answer(res1, res2)
isctest.check.adflag(res2)
# check recovery with mismatching NS
ns4.rndc("flush", log=False)
msg = isctest.query.create("inconsistent", "NS", dnssec=False, cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noadflag(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.additional, 1)
msg = isctest.query.create("inconsistent", "NS", cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noadflag(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.additional, 1)
msg = isctest.query.create("inconsistent", "NS")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.adflag(res)
isctest.check.rr_count_eq(res.answer, 3)
isctest.check.rr_count_eq(res.additional, 0)
def test_failed_validation():
# bogus zone
msg = isctest.query.create("a.bogus.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
# missing key record
msg = isctest.query.create("a.b.keyless.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
def test_revoked_key():
# validation should succeed if a revoked key is encountered
msg = isctest.query.create("revkey.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
def test_standby_key():
# check that a secure chain with one active and one inactive KSK
# validates as secure
msg = isctest.query.create("a.lazy-ksk", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
def test_transitions():
# check that a zone finishing transitioning from one algorithm
# to another validates secure
msg = isctest.query.create("algroll", "NS")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
# check that validation yields insecure during transition to signed
msg = isctest.query.create("inprogress", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.noadflag(res)
a, _ = res.answer
assert str(a[0]) == "10.53.0.10"
def test_validating_forwarder(ns4, ns9):
# check validating forwarder behavior with mismatching NS
ns4.rndc("flush", log=False)
msg = isctest.query.create("inconsistent", "NS", dnssec=False, cd=True)
res = isctest.query.tcp(msg, "10.53.0.9")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.additional, 0)
isctest.check.noadflag(res)
msg = isctest.query.create("inconsistent", "NS", cd=True)
res = isctest.query.tcp(msg, "10.53.0.9")
isctest.check.rr_count_eq(res.additional, 0)
isctest.check.noadflag(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.authority, 0)
isctest.check.rr_count_eq(res.additional, 0)
msg.flags &= ~flags.CD
res = isctest.query.tcp(msg, "10.53.0.9")
isctest.check.rr_count_eq(res.answer, 3)
isctest.check.rr_count_eq(res.authority, 0)
isctest.check.rr_count_eq(res.additional, 0)
isctest.check.adflag(res)
# check validating forwarder sends CD to validate with a local trust anchor
ns4.rndc("flush", log=False)
msg = isctest.query.create("localkey.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
with ns9.watch_log_from_here() as watcher:
res = isctest.query.tcp(msg, "10.53.0.9")
isctest.check.noerror(res)
isctest.check.adflag(res)
watcher.wait_for_line("status: SERVFAIL")
def test_expired_signatures(ns4):
# check expired signatures do not validate
msg = isctest.query.create("expired.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.3")
rrsig = res.get_rrset(
res.answer,
name.from_text("expired.example."),
rdataclass.IN,
rdatatype.RRSIG,
rdatatype.SOA,
)
assert rrsig, "expected RRSIG(SOA) missing from AUTHORITY: " + str(rrsig)
isctest.check.rr_count_eq(res.answer, 2)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
isctest.check.noadflag(res)
if hasattr(res, "extended_errors"):
assert res.extended_errors()[0].code == edns.EDECode.SIGNATURE_EXPIRED
assert grep_q("expired.example/.*: RRSIG has expired", "ns4/named.run")
# check future signatures do not validate
msg = isctest.query.create("future.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.servfail(res)
isctest.check.noadflag(res)
if hasattr(res, "extended_errors"):
assert res.extended_errors()[0].code == edns.EDECode.SIGNATURE_NOT_YET_VALID
assert grep_q(
"future.example/.*: RRSIG validity period has not begun", "ns4/named.run"
)
# check that a dynamic zone with future signatures is re-signed on load
msg = isctest.query.create("managed-future.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.adflag(res)
isctest.check.noerror(res)
# test TTL is capped at RRSIG expiry time
ns4.rndc("flush", log=False)
msg = isctest.query.create("expiring.example", "SOA", cd=True)
res1 = isctest.query.tcp(msg, "10.53.0.4")
msg = isctest.query.create("expiring.example", "SOA")
res2 = isctest.query.tcp(msg, "10.53.0.4")
for rrset in res1.answer:
assert 240 <= rrset.ttl <= 300
for rrset in res2.answer:
assert rrset.ttl <= 60
# test TTL is capped at RRSIG expiry time in the additional section (NS)
ns4.rndc("flush", log=False)
msg = isctest.query.create("expiring.example", "NS", cd=True)
res1 = isctest.query.tcp(msg, "10.53.0.4")
msg = isctest.query.create("expiring.example", "NS")
res2 = isctest.query.tcp(msg, "10.53.0.4")
for rrset in res1.additional:
assert 240 <= rrset.ttl <= 300
for rrset in res2.additional:
assert rrset.ttl <= 60
# test TTL is capped at RRSIG expiry time in the additional section (MX)
ns4.rndc("flush", log=False)
msg = isctest.query.create("expiring.example", "MX", cd=True)
res1 = isctest.query.tcp(msg, "10.53.0.4")
msg = isctest.query.create("expiring.example", "MX")
res2 = isctest.query.tcp(msg, "10.53.0.4")
for rrset in res1.additional:
assert 240 <= rrset.ttl <= 300
for rrset in res2.additional:
assert rrset.ttl <= 60
def test_casing():
# test legacy upper-case signer name validation
msg = isctest.query.create("upper.example", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.adflag(res)
_, sig = res.answer
assert sig.rdtype == rdatatype.RRSIG
assert sig.covers == rdatatype.SOA
assert "UPPER.EXAMPLE." in str(sig[0])
# test that we lower-case signer name
msg = isctest.query.create("LOWER.EXAMPLE", "SOA")
res = isctest.query.tcp(msg, "10.53.0.4")
_, sig = res.answer
assert sig.rdtype == rdatatype.RRSIG
assert sig.covers == rdatatype.SOA
assert "lower.example." in str(sig[0])
def test_broken_servers():
# check that a non-cacheable NODATA works
msg = isctest.query.create("a.nosoa.secure.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.6")
isctest.check.rr_count_eq(res1.authority, 0)
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res2)
# check that a non-cacheable NXDOMAIN works
msg = isctest.query.create("b.nosoa.secure.example", "TXT")
res1 = isctest.query.tcp(msg, "10.53.0.6")
isctest.check.rr_count_eq(res1.authority, 0)
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.nxdomain(res2)
# check that split RRSIGs are handled
msg = isctest.query.create("split-rrsig", "SOA")
res = isctest.query.tcp(msg, "10.53.0.6")
soa, _ = res.answer
assert soa[0].serial > 1
# check that not-at-zone-apex RRSIG(SOA) rrsets are removed
msg = isctest.query.create("split-rrsig", "AXFR")
res = isctest.query.tcp(msg, "10.53.0.6")
nza = [
r
for r in res.answer
if str(r.name) == "not-at-zone-apex.split-rrsig."
and r.rdtype == rdatatype.RRSIG
and r.covers == rdatatype.SOA
]
assert not nza
# check validation with missing nearest encloser proof
msg = isctest.query.create("b.c.d.optout-tld", "DS")
res = isctest.query.tcp(msg, "10.53.0.6")
nsec3s = [a for a in res.authority if a.rdtype == rdatatype.NSEC3]
assert len(nsec3s) == 2
msg = isctest.query.create("b.c.d.optout-tld", "A")
res = isctest.query.tcp(msg, "10.53.0.6")
nsec3s = [a for a in res.authority if a.rdtype == rdatatype.NSEC3]
assert len(nsec3s) == 1
res = isctest.query.tcp(msg, "10.53.0.6")
isctest.check.noerror(res)
isctest.check.noadflag(res)
msg = isctest.query.create("optout-tld", "SOA")
res = isctest.query.tcp(msg, "10.53.0.6")
isctest.check.noadflag(res)
def test_pending_ds(ns4):
# check that a query against a validating resolver succeeds when there is
# a negative cache entry with trust level "pending" for the DS. prime
# with a +cd DS query to produce the negative cache entry, then send a
# query that uses that entry as part of the validation process.
ns4.rndc("flush", log=False)
msg = isctest.query.create("insecure.example", "DS", cd=True)
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.authority, 4)
msg = isctest.query.create("a.insecure.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.rr_count_eq(res.answer, 1)
isctest.check.rr_count_eq(res.authority, 1)
isctest.check.noadflag(res)
def test_unknown_algorithms():
# check that unknown DNSKEY algorithm validates as insecure
msg = isctest.query.create("dnskey-unknown.example", "A", dnssec=False)
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
# check that unsupported DNSKEY algorithms are in the DNSKEY RRsets
msg = isctest.query.create("dnskey-unsupported.example", "DNSKEY")
res = isctest.query.tcp(msg, "10.53.0.3")
isctest.check.noerror(res)
msg = isctest.query.create("dnskey-unsupported-2.example", "DNSKEY")
res = isctest.query.tcp(msg, "10.53.0.3")
isctest.check.noerror(res)
rrsets = [str(r) for r in res.answer]
assert any("257 3 255" in r for r in rrsets)
# check that unsupported DNSKEY algorithm validates as insecure
msg = isctest.query.create("dnskey-unsupported.example", "DNSKEY")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.noadflag(res)
if hasattr(res, "extended_errors"):
assert (
res.extended_errors()[0].code == edns.EDECode.UNSUPPORTED_DNSKEY_ALGORITHM
)
# check that DNSKEY with an unsupported reserve key validates
msg = isctest.query.create("dnskey-unsupported-2.example", "DNSKEY")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res)
isctest.check.adflag(res)
# check EDE code 2 for unsupported DS digest algorithm
msg = isctest.query.create("a.ds-unsupported.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
if hasattr(res, "extended_errors"):
assert res.extended_errors()[0].code == edns.EDECode.UNSUPPORTED_DS_DIGEST_TYPE
# check EDE code 1 for bad algorithm mnemonic
msg = isctest.query.create("badalg.secure.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noadflag(res)
if hasattr(res, "extended_errors"):
assert (
res.extended_errors()[0].code == edns.EDECode.UNSUPPORTED_DNSKEY_ALGORITHM
)
# check both EDE code 1 and 2 for unsupported digest on one DNSKEY
# and unsupported algorithm on the other
msg = isctest.query.create("a.digest-alg-unsupported.example", "A")
res = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noadflag(res)
if hasattr(res, "extended_errors"):
codes = {ede.code for ede in res.extended_errors()}
assert edns.EDECode.UNSUPPORTED_DNSKEY_ALGORITHM in codes
assert edns.EDECode.UNSUPPORTED_DS_DIGEST_TYPE in codes
# check that unknown DNSKEY algorithm + unknown NSEC3 hash algorithm
# validates as insecure
msg = isctest.query.create("dnskey-nsec3-unknown.example", "A")
res1 = isctest.query.tcp(msg, "10.53.0.3")
res2 = isctest.query.tcp(msg, "10.53.0.4")
isctest.check.noerror(res1)
isctest.check.noerror(res2)
isctest.check.noadflag(res2)
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