296 lines
12 KiB
Python
296 lines
12 KiB
Python
#
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# Copyright 2021 - The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import time
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from acts import asserts
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from acts.controllers.openwrt_ap import MOBLY_CONTROLLER_CONFIG_NAME as OPENWRT
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from acts.test_decorators import test_tracker_info
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from acts_contrib.test_utils.net import connectivity_const as cconst
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from acts_contrib.test_utils.net import connectivity_test_utils as cutils
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from acts_contrib.test_utils.net.net_test_utils import start_tcpdump
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from acts_contrib.test_utils.net.net_test_utils import stop_tcpdump
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from acts_contrib.test_utils.wifi import wifi_test_utils as wutils
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from acts_contrib.test_utils.wifi.WifiBaseTest import WifiBaseTest
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from scapy.all import rdpcap
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from scapy.all import Scapy_Exception
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from scapy.all import TCP
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from scapy.all import UDP
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DEFAULT_DNS_TIMEOUT = 5
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class DnsOverHttpsTest(WifiBaseTest):
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"""Tests for DnsoverHttps feature."""
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def setup_class(self):
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"""Setup devices and OpenWrt for DnsoverHttps test and unpack params."""
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self.dut = self.android_devices[0]
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if len(self.android_devices) > 1:
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self.dut_b = self.android_devices[1]
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for ad in self.android_devices:
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wutils.reset_wifi(ad)
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ad.droid.setPrivateDnsMode(True)
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req_params = ("ping_hosts",)
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opt_params = ("wifi_network", "configure_OpenWrt",
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"ipv4_only_network", "ipv4_ipv6_network")
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self.unpack_userparams(req_param_names=req_params,
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opt_param_names=opt_params)
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if OPENWRT in self.user_params:
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self.openwrt = self.access_points[0]
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if hasattr(self, "configure_OpenWrt") and self.configure_OpenWrt == "skip":
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self.dut.log.info("Skip configure Wifi interface due to config setup.")
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else:
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self.configure_openwrt_ap_and_start(wpa_network=True)
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self.tcpdump_pid = None
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self.default_dns = None
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self.default_dns_v6 = None
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self._setup_doh(self.dut, self.get_wifi_network())
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def teardown_test(self):
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wutils.reset_wifi(self.dut)
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if OPENWRT in self.user_params:
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self.openwrt.network_setting.del_default_dns(self.default_dns)
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self.default_dns = None
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self.default_dns_v6 = None
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def teardown_class(self):
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for ad in self.android_devices:
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ad.droid.setPrivateDnsMode(True)
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self._setup_doh(ad, self.get_wifi_network(), enable=False)
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def on_fail(self, test_name, begin_time):
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self.dut.take_bug_report(test_name, begin_time)
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def get_wifi_network(self, ipv6_supported=False):
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"""Return fit network for conditions.
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Args:
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ipv6_supported: Boolean for select network.
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Returns:
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A dict for network object for connect wifi.
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"""
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if OPENWRT in self.user_params:
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if ipv6_supported:
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self.openwrt.network_setting.enable_ipv6()
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self.openwrt.network_setting.setup_ipv6_bridge()
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else:
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self.openwrt.network_setting.disable_ipv6()
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self.openwrt.network_setting.remove_ipv6_bridge()
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if self.default_dns:
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self.openwrt.network_setting.add_default_dns(self.default_dns)
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if self.default_dns_v6:
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for ipv6_dns in self.default_dns_v6:
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self.openwrt.network_setting.add_default_v6_dns(ipv6_dns)
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if hasattr(self, "configure_OpenWrt") and self.configure_OpenWrt == "skip":
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return self.wifi_network
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return self.openwrt.get_wifi_network()
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if ipv6_supported:
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return self.ipv4_ipv6_network
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return self.ipv4_only_network
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def _verify_doh_queries(self, pcap_file, over_https):
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"""Verify if DNS queries were over https or not.
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Args:
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pcap_file: tcpdump file
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over_https: True if excepted all dns go through doh.
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"""
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try:
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packets = rdpcap(pcap_file)
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except Scapy_Exception:
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asserts.fail("Not a valid pcap file")
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for pkt in packets:
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summary = "%s" % pkt.summary()
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for host in self.ping_hosts:
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host = host.split(".")[-2]
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if UDP in pkt and pkt[UDP].sport == 53 and host in summary:
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if over_https:
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asserts.fail("Found query to port 53: %s" % summary)
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else:
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self.dut.log.info("Found query to port 53: %s" % summary)
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if TCP in pkt and pkt[TCP].sport == 853:
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asserts.fail("Found query to port 853: %s" % summary)
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def _test_public_doh_mode(self, ad, net, dns_mode, hostname=None):
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"""Test step for DoH.
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Args:
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ad: android device object.
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net: wifi network to connect to, LTE network if None.
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dns_mode: private DNS mode.
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hostname: private DNS hostname to set to.
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"""
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# set private dns mode
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if dns_mode:
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cutils.set_private_dns(self.dut, dns_mode, hostname)
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# connect to wifi
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wutils.start_wifi_connection_scan_and_ensure_network_found(
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self.dut, net[wutils.WifiEnums.SSID_KEY])
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wutils.wifi_connect(self.dut, net)
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self._verify_tls_completed()
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# start tcpdump on the device
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self.tcpdump_pid = start_tcpdump(self.dut, self.test_name)
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# ping hosts should pass
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for host in self.ping_hosts:
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self.log.info("Pinging %s" % host)
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status = wutils.validate_connection(self.dut, host)
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asserts.assert_true(status, "Failed to ping host %s" % host)
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self.log.info("Ping successful")
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# stop tcpdump
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pcap_file = stop_tcpdump(self.dut, self.tcpdump_pid, self.test_name)
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# verify DNS queries
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overhttps = dns_mode != cconst.PRIVATE_DNS_MODE_OFF
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self._verify_doh_queries(pcap_file, overhttps)
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# reset wifi
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wutils.reset_wifi(self.dut)
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def _verify_tls_completed(self, retry_count=5):
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"""Verify tls finish verification process.
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Expect all private dns server status, should be
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"success", or "fail".
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Args:
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retry_count: int for retry times.
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Raises:
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TimeoutError: if TLS verification stuck in processing.
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"""
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for attempt in range(retry_count):
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out = self.dut.adb.shell("dumpsys dnsresolver")
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if "status{in_process}" in out:
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if attempt + 1 < retry_count:
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self.dut.log.info("DoT still validating, retrying...")
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time.sleep(DEFAULT_DNS_TIMEOUT)
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else:
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return
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raise TimeoutError("Fail to completed TLS verification.")
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def _setup_doh(self, ad, net, enable=True):
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"""Enable/Disable DoH option.
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Args:
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ad: android devies.
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net: network as wifi.
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enable: if True, sets the 'doh' experiment flag.
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"""
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if enable:
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ad.adb.shell("setprop persist.device_config.netd_native.doh 1")
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else:
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ad.adb.shell("setprop persist.device_config.netd_native.doh 0")
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wutils.wifi_connect(ad, net)
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wutils.reset_wifi(ad)
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out = ad.adb.shell("dumpsys dnsresolver |grep doh")
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ad.log.debug(out)
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def test_mix_server_ipv4_only_wifi_network_with_dns_strict_mode(self):
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"""Test doh flag with below situation.
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- Android device in strict mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-only network
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"""
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_STRICT,
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hostname=cconst.DNS_GOOGLE_HOSTNAME)
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def test_mix_server_ipv4_ipv6_wifi_network_with_dns_strict_mode(self):
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"""Test doh flag with below situation.
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- Android device in strict mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-IPv6 network
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"""
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_STRICT,
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hostname=cconst.DNS_GOOGLE_HOSTNAME)
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def test_pure_server_ipv4_only_wifi_network_with_dns_strict_mode(self):
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"""Test doh flag with below situation.
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- Android device in strict mode
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- DNS server only supporting DoH protocols
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- IPv4-only network
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"""
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_STRICT,
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hostname=cconst.DOH_CLOUDFLARE_HOSTNAME)
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def test_pure_server_ipv4_ipv6_wifi_network_with_dns_strict_mode(self):
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"""Test doh flag with below situation.
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- Android device in strict mode
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- DNS server only supporting DoH protocols
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- IPv4-IPv6 network
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"""
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_STRICT,
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hostname=cconst.DOH_CLOUDFLARE_HOSTNAME)
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def test_mix_server_ipv4_only_wifi_network_with_dns_opportunistic_mode(self):
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"""Test doh flag with below situation.
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- Android device in opportunistic mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-only network
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"""
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self.default_dns = cconst.DNS_GOOGLE_ADDR_V4
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_OPPORTUNISTIC)
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def test_mix_server_ipv4_ipv6_wifi_network_with_dns_opportunistic_mode(self):
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"""Test doh flag with below situation.
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- Android device in opportunistic mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-IPv6 network
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"""
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self.default_dns = cconst.DNS_GOOGLE_ADDR_V4
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self.default_dns_v6 = cconst.DNS_GOOGLE_ADDR_V6
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_OPPORTUNISTIC)
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def test_mix_server_ipv4_only_wifi_network_with_dns_off_mode(self):
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"""Test doh with below situation.
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- Android device in dns off mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-only network
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"""
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self.default_dns = cconst.DNS_GOOGLE_ADDR_V4
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_OFF)
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def test_mix_server_ipv4_ipv6_wifi_network_with_dns_off_mode(self):
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"""Test doh with below situation.
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- Android device in dns off mode
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- DNS server supporting both Dns, DoT and DoH protocols
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- IPv4-IPv6 network
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"""
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self.default_dns = cconst.DNS_GOOGLE_ADDR_V4
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self.default_dns_v6 = cconst.DNS_GOOGLE_ADDR_V6
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self._test_public_doh_mode(self.dut, self.get_wifi_network(),
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cconst.PRIVATE_DNS_MODE_OFF)
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