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#!/usr/bin/python
#
# Copyright 2017 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Unit tests for xt_qtaguid."""
import errno
from socket import * # pylint: disable=wildcard-import
import unittest
import os
import net_test
import packets
import tcp_test
CTRL_PROCPATH = "/proc/net/xt_qtaguid/ctrl"
OTHER_UID_GID = 12345
class QtaguidTest(tcp_test.TcpBaseTest):
def RunIptablesCommand(self, args):
self.assertFalse(net_test.RunIptablesCommand(4, args))
self.assertFalse(net_test.RunIptablesCommand(6, args))
def setUp(self):
self.RunIptablesCommand("-N qtaguid_test_OUTPUT")
self.RunIptablesCommand("-A OUTPUT -j qtaguid_test_OUTPUT")
def tearDown(self):
self.RunIptablesCommand("-D OUTPUT -j qtaguid_test_OUTPUT")
self.RunIptablesCommand("-F qtaguid_test_OUTPUT")
self.RunIptablesCommand("-X qtaguid_test_OUTPUT")
def WriteToCtrl(self, command):
ctrl_file = open(CTRL_PROCPATH, 'w')
ctrl_file.write(command)
ctrl_file.close()
def CheckTag(self, tag, uid):
for line in open(CTRL_PROCPATH, 'r').readlines():
if "tag=0x%x (uid=%d)" % ((tag|uid), uid) in line:
return True
return False
def SetIptablesRule(self, version, is_add, is_gid, my_id, inverted):
add_del = "-A" if is_add else "-D"
uid_gid = "--gid-owner" if is_gid else "--uid-owner"
if inverted:
args = "%s qtaguid_test_OUTPUT -m owner ! %s %d -j DROP" % (add_del, uid_gid, my_id)
else:
args = "%s qtaguid_test_OUTPUT -m owner %s %d -j DROP" % (add_del, uid_gid, my_id)
self.assertFalse(net_test.RunIptablesCommand(version, args))
def AddIptablesRule(self, version, is_gid, myId):
self.SetIptablesRule(version, True, is_gid, myId, False)
def AddIptablesInvertedRule(self, version, is_gid, myId):
self.SetIptablesRule(version, True, is_gid, myId, True)
def DelIptablesRule(self, version, is_gid, myId):
self.SetIptablesRule(version, False, is_gid, myId, False)
def DelIptablesInvertedRule(self, version, is_gid, myId):
self.SetIptablesRule(version, False, is_gid, myId, True)
def CheckSocketOutput(self, version, is_gid):
myId = os.getgid() if is_gid else os.getuid()
self.AddIptablesRule(version, is_gid, myId)
family = {4: AF_INET, 6: AF_INET6}[version]
s = socket(family, SOCK_DGRAM, 0)
addr = {4: "127.0.0.1", 6: "::1"}[version]
s.bind((addr, 0))
addr = s.getsockname()
self.assertRaisesErrno(errno.EPERM, s.sendto, "foo", addr)
self.DelIptablesRule(version, is_gid, myId)
s.sendto("foo", addr)
data, sockaddr = s.recvfrom(4096)
self.assertEqual("foo", data)
self.assertEqual(sockaddr, addr)
def CheckSocketOutputInverted(self, version, is_gid):
# Load a inverted iptable rule on current uid/gid 0, traffic from other
# uid/gid should be blocked and traffic from current uid/gid should pass.
myId = os.getgid() if is_gid else os.getuid()
self.AddIptablesInvertedRule(version, is_gid, myId)
family = {4: AF_INET, 6: AF_INET6}[version]
s = socket(family, SOCK_DGRAM, 0)
addr1 = {4: "127.0.0.1", 6: "::1"}[version]
s.bind((addr1, 0))
addr1 = s.getsockname()
s.sendto("foo", addr1)
data, sockaddr = s.recvfrom(4096)
self.assertEqual("foo", data)
self.assertEqual(sockaddr, addr1)
with net_test.RunAsUidGid(0 if is_gid else 12345,
12345 if is_gid else 0):
s2 = socket(family, SOCK_DGRAM, 0)
addr2 = {4: "127.0.0.1", 6: "::1"}[version]
s2.bind((addr2, 0))
addr2 = s2.getsockname()
self.assertRaisesErrno(errno.EPERM, s2.sendto, "foo", addr2)
self.DelIptablesInvertedRule(version, is_gid, myId)
s.sendto("foo", addr1)
data, sockaddr = s.recvfrom(4096)
self.assertEqual("foo", data)
self.assertEqual(sockaddr, addr1)
def SendRSTOnClosedSocket(self, version, netid, expect_rst):
self.IncomingConnection(version, tcp_test.TCP_ESTABLISHED, netid)
self.accepted.setsockopt(net_test.SOL_TCP, net_test.TCP_LINGER2, -1)
net_test.EnableFinWait(self.accepted)
self.accepted.shutdown(SHUT_WR)
desc, fin = self.FinPacket()
self.ExpectPacketOn(netid, "Closing FIN_WAIT1 socket", fin)
finversion = 4 if version == 5 else version
desc, finack = packets.ACK(finversion, self.remoteaddr, self.myaddr, fin)
self.ReceivePacketOn(netid, finack)
try:
self.ExpectPacketOn(netid, "Closing FIN_WAIT1 socket", fin)
except AssertionError:
pass
self.accepted.close()
desc, rst = packets.RST(version, self.myaddr, self.remoteaddr, self.last_packet)
if expect_rst:
msg = "closing socket with linger2, expecting %s: " % desc
self.ExpectPacketOn(netid, msg, rst)
else:
msg = "closing socket with linger2, expecting no packets"
self.ExpectNoPacketsOn(netid, msg)
def CheckUidGidCombination(self, version, invert_gid, invert_uid):
my_uid = os.getuid()
my_gid = os.getgid()
if invert_gid:
self.AddIptablesInvertedRule(version, True, my_gid)
else:
self.AddIptablesRule(version, True, OTHER_UID_GID)
if invert_uid:
self.AddIptablesInvertedRule(version, False, my_uid)
else:
self.AddIptablesRule(version, False, OTHER_UID_GID)
for netid in self.NETIDS:
self.SendRSTOnClosedSocket(version, netid, not invert_gid)
if invert_gid:
self.DelIptablesInvertedRule(version, True, my_gid)
else:
self.DelIptablesRule(version, True, OTHER_UID_GID)
if invert_uid:
self.AddIptablesInvertedRule(version, False, my_uid)
else:
self.DelIptablesRule(version, False, OTHER_UID_GID)
def testCloseWithoutUntag(self):
self.dev_file = open("/dev/xt_qtaguid", "r");
sk = socket(AF_INET, SOCK_DGRAM, 0)
uid = os.getuid()
tag = 0xff00ff00 << 32
command = "t %d %d %d" % (sk.fileno(), tag, uid)
self.WriteToCtrl(command)
self.assertTrue(self.CheckTag(tag, uid))
sk.close();
self.assertFalse(self.CheckTag(tag, uid))
self.dev_file.close();
def testTagWithoutDeviceOpen(self):
sk = socket(AF_INET, SOCK_DGRAM, 0)
uid = os.getuid()
tag = 0xff00ff00 << 32
command = "t %d %d %d" % (sk.fileno(), tag, uid)
self.WriteToCtrl(command)
self.assertTrue(self.CheckTag(tag, uid))
self.dev_file = open("/dev/xt_qtaguid", "r")
sk.close()
self.assertFalse(self.CheckTag(tag, uid))
self.dev_file.close();
def testUidGidMatch(self):
self.CheckSocketOutput(4, False)
self.CheckSocketOutput(6, False)
self.CheckSocketOutput(4, True)
self.CheckSocketOutput(6, True)
self.CheckSocketOutputInverted(4, True)
self.CheckSocketOutputInverted(6, True)
self.CheckSocketOutputInverted(4, False)
self.CheckSocketOutputInverted(6, False)
def testCheckNotMatchGid(self):
self.assertIn("match_no_sk_gid", open(CTRL_PROCPATH, 'r').read())
def testRstPacketNotDropped(self):
my_uid = os.getuid()
self.AddIptablesInvertedRule(4, False, my_uid)
for netid in self.NETIDS:
self.SendRSTOnClosedSocket(4, netid, True)
self.DelIptablesInvertedRule(4, False, my_uid)
self.AddIptablesInvertedRule(6, False, my_uid)
for netid in self.NETIDS:
self.SendRSTOnClosedSocket(6, netid, True)
self.DelIptablesInvertedRule(6, False, my_uid)
def testUidGidCombineMatch(self):
self.CheckUidGidCombination(4, invert_gid=True, invert_uid=True)
self.CheckUidGidCombination(4, invert_gid=True, invert_uid=False)
self.CheckUidGidCombination(4, invert_gid=False, invert_uid=True)
self.CheckUidGidCombination(4, invert_gid=False, invert_uid=False)
self.CheckUidGidCombination(6, invert_gid=True, invert_uid=True)
self.CheckUidGidCombination(6, invert_gid=True, invert_uid=False)
self.CheckUidGidCombination(6, invert_gid=False, invert_uid=True)
self.CheckUidGidCombination(6, invert_gid=False, invert_uid=False)
if __name__ == "__main__":
unittest.main()
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