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#!/usr/bin/python3
# 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 time
import os
import pytest
pytest.importorskip("dns", minversion="2.0.0")
import dns.resolver
def wait_for_transfer(ip, port, client_ip, name, rrtype):
resolver = dns.resolver.Resolver()
resolver.nameservers = [ip]
resolver.port = port
for _ in range(10):
try:
resolver.resolve(name, rrtype, source=client_ip)
except dns.resolver.NoNameservers:
time.sleep(1)
else:
break
else:
raise RuntimeError(
"zone transfer failed: "
f"client {client_ip} got NXDOMAIN for {name} {rrtype} from @{ip}:{port}"
)
def test_rpz_multiple_views(named_port):
resolver = dns.resolver.Resolver()
resolver.nameservers = ["10.53.0.3"]
resolver.port = named_port
wait_for_transfer("10.53.0.3", named_port, "10.53.0.2", "rpz-external.local", "SOA")
wait_for_transfer("10.53.0.3", named_port, "10.53.0.5", "rpz-external.local", "SOA")
# For 10.53.0.1 source IP:
# - baddomain.com isn't allowed (CNAME .), should return NXDOMAIN
# - gooddomain.com is allowed
# - allowed. is allowed
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("baddomain.", "A", source="10.53.0.1")
ans = resolver.resolve("gooddomain.", "A", source="10.53.0.1")
assert ans[0].address == "10.53.0.2"
ans = resolver.resolve("allowed.", "A", source="10.53.0.1")
assert ans[0].address == "10.53.0.2"
# For 10.53.0.2 source IP:
# - allowed.com isn't allowed (CNAME .), should return NXDOMAIN
# - baddomain.com is allowed
# - gooddomain.com is allowed
ans = resolver.resolve("baddomain.", "A", source="10.53.0.2")
assert ans[0].address == "10.53.0.2"
ans = resolver.resolve("gooddomain.", "A", source="10.53.0.2")
assert ans[0].address == "10.53.0.2"
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("allowed.", "A", source="10.53.0.2")
# For 10.53.0.3 source IP:
# - gooddomain.com is allowed
# - baddomain.com is allowed
# - allowed. is allowed
ans = resolver.resolve("baddomain.", "A", source="10.53.0.3")
assert ans[0].address == "10.53.0.2"
ans = resolver.resolve("gooddomain.", "A", source="10.53.0.3")
assert ans[0].address == "10.53.0.2"
ans = resolver.resolve("allowed.", "A", source="10.53.0.3")
assert ans[0].address == "10.53.0.2"
# For 10.53.0.4 source IP:
# - gooddomain.com isn't allowed (CNAME .), should return NXDOMAIN
# - baddomain.com isn't allowed (CNAME .), should return NXDOMAIN
# - allowed. is allowed
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("baddomain.", "A", source="10.53.0.4")
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("gooddomain.", "A", source="10.53.0.4")
ans = resolver.resolve("allowed.", "A", source="10.53.0.4")
assert ans[0].address == "10.53.0.2"
# For 10.53.0.5 (any) source IP:
# - baddomain.com is allowed
# - gooddomain.com isn't allowed (CNAME .), should return NXDOMAIN
# - allowed.com isn't allowed (CNAME .), should return NXDOMAIN
ans = resolver.resolve("baddomain.", "A", source="10.53.0.5")
assert ans[0].address == "10.53.0.2"
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("gooddomain.", "A", source="10.53.0.5")
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("allowed.", "A", source="10.53.0.5")
def test_rpz_passthru_logging(named_port):
resolver = dns.resolver.Resolver()
resolver.nameservers = ["10.53.0.3"]
resolver.port = named_port
# Should generate a log entry into rpz_passthru.txt
ans = resolver.resolve("allowed.", "A", source="10.53.0.1")
assert ans[0].address == "10.53.0.2"
# baddomain.com isn't allowed (CNAME .), should return NXDOMAIN
# Should generate a log entry into rpz.txt
with pytest.raises(dns.resolver.NXDOMAIN):
resolver.resolve("baddomain.", "A", source="10.53.0.1")
rpz_passthru_logfile = os.path.join("ns3", "rpz_passthru.txt")
rpz_logfile = os.path.join("ns3", "rpz.txt")
assert os.path.isfile(rpz_passthru_logfile)
assert os.path.isfile(rpz_logfile)
with open(rpz_passthru_logfile, encoding="utf-8") as log_file:
line = log_file.read()
assert "rpz QNAME PASSTHRU rewrite allowed/A/IN" in line
with open(rpz_logfile, encoding="utf-8") as log_file:
line = log_file.read()
assert "rpz QNAME PASSTHRU rewrite allowed/A/IN" not in line
assert "rpz QNAME NXDOMAIN rewrite baddomain/A/IN" in line
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