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# -*- coding: utf-8 -*-
# manager.py
# Copyright (C) 2015 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# alng with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Firewall Manager
"""
import commands
import os
import subprocess
from twisted.logger import Logger
from leap.bitmask.vpn.constants import IS_MAC
from leap.common.events import catalog, emit_async
log = Logger()
# TODO -- subclass it for osx/windows, not only for linux.
# A regular user should not run bitmask as root, but we contemplate
# this case for tests inside docker.
NOT_ROOT = os.getuid() != 0
def check_root(cmd):
if NOT_ROOT:
cmd = ['pkexec'] + cmd
return cmd
class FirewallManager(object):
"""
Firewall manager that blocks/unblocks all the internet traffic with some
exceptions.
This allows us to achieve fail close on a vpn connection.
"""
BITMASK_ROOT = "/usr/local/sbin/bitmask-root"
def __init__(self, remotes):
"""
Initialize the firewall manager with a set of remotes that we won't
block.
:param remotes: the gateway(s) that we will allow
:type remotes: list
"""
self._remotes = remotes
def start(self, restart=False):
"""
Launch the firewall using the privileged wrapper.
:returns: True if the exitcode of calling the root helper in a
subprocess is 0.
:rtype: bool
"""
gateways = [gateway for gateway, port in self._remotes]
# XXX check for wrapper existence, check it's root owned etc.
# XXX check that the iptables rules are in place.
cmd = [self.BITMASK_ROOT, "firewall", "start"]
cmd = check_root(cmd)
if restart:
cmd.append("restart")
result = '<did not run>'
try:
retcode, result = commands.getstatusoutput(
' '.join(cmd + gateways))
#stderr=subprocess.STDOUT)
except Exception:
log.failure('Error launching the firewall')
finally:
log.debug(result)
emit_async(catalog.VPN_STATUS_CHANGED)
return True
def stop(self):
"""
Tear the firewall down using the privileged wrapper.
"""
# We don't support Mac so far
if IS_MAC:
return True
cmd = [self.BITMASK_ROOT, "firewall", "stop"]
cmd = check_root(cmd)
exitCode = subprocess.call(cmd)
emit_async(catalog.VPN_STATUS_CHANGED)
if exitCode == 0:
return True
else:
return False
def is_up(self):
"""
Return whether the firewall is up or not.
:rtype: bool
"""
cmd = [self.BITMASK_ROOT, "firewall", "isup"]
cmd = check_root(cmd)
cmd = ' '.join(cmd)
output = commands.getstatusoutput(cmd)[0]
return output != 256
@property
def status(self):
status = 'off'
if self.is_up():
status = 'on'
return {'status': status, 'error': None}
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