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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.util import STANDALONE
from leap.bitmask.system import IS_MAC, IS_LINUX, IS_SNAP
from leap.common.events import catalog, emit_async
from leap.bitmask.vpn.launchers import darwin
if IS_LINUX:
from leap.bitmask.vpn.constants import BITMASK_ROOT_SYSTEM
from leap.bitmask.vpn.constants import BITMASK_ROOT_LOCAL
from leap.bitmask.vpn.constants import BITMASK_ROOT_SNAP
log = Logger()
# 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 FirewallError(Exception):
pass
class _OSXFirewallManager(object):
def __init__(self, remotes):
self._remotes = list(remotes)
self._helper = darwin.HelperCommand()
self._started = False
def start(self, restart=False):
gateways = [gateway for gateway, port in self._remotes]
cmd = 'firewall_start %s' % (' '.join(gateways),)
self._helper.send(cmd)
self._started = True
# TODO parse OK from result
return True
def stop(self):
cmd = 'firewall_stop'
self._helper.send(cmd)
self._started = False
return True
def is_up(self):
# TODO implement!!!
return self._started
@property
def status(self):
# TODO implement!!! -- factor out, too
status = 'on' if self._started else 'off'
return {'status': status, 'error': None}
class _LinuxFirewallManager(object):
"""
Firewall manager that blocks/unblocks all the internet traffic with some
exceptions.
This allows us to achieve fail close on a vpn connection.
"""
# TODO factor out choosing a version of bitmask-root.
# together with linux vpnlauncher.
if IS_SNAP:
# snap has its own version under /snap
BITMASK_ROOT = BITMASK_ROOT_SNAP
elif STANDALONE and os.path.isfile(BITMASK_ROOT_LOCAL):
# if this is a bundle, we pick local. bundles ask to install it there.
BITMASK_ROOT = BITMASK_ROOT_LOCAL
else:
try:
if os.path.isfile(BITMASK_ROOT_SYSTEM):
# we can be running from the debian package,
# or some other distro. it's the maintainer responsibility to
# put bitmask-root there.
BITMASK_ROOT = BITMASK_ROOT_SYSTEM
else:
# as a last case, we fall back to installing into the
# /usr/local/sbin version.
BITMASK_ROOT = BITMASK_ROOT_LOCAL
except NameError:
# not defined for other platforms
pass
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>'
if not os.path.isfile(self.BITMASK_ROOT):
raise FirewallError('Could not find bitmask-root!')
try:
retcode, result = commands.getstatusoutput(
' '.join(cmd + gateways))
except Exception:
msg = 'Error launching the firewall'
log.failure(msg)
if NOT_ROOT:
raise FirewallError(msg)
finally:
log.debug(result)
emit_async(catalog.VPN_STATUS_CHANGED, "FW_ON")
return True
def stop(self):
"""
Tear the firewall down using the privileged wrapper.
"""
cmd = [self.BITMASK_ROOT, "firewall", "stop"]
cmd = check_root(cmd)
exitCode = subprocess.call(cmd)
emit_async(catalog.VPN_STATUS_CHANGED, "FW_OFF")
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}
if IS_LINUX:
FirewallManager = _LinuxFirewallManager
elif IS_MAC:
FirewallManager = _OSXFirewallManager
|
