summaryrefslogtreecommitdiff
path: root/src/leap/bitmask/vpn/fw/firewall.py
blob: f4325c77f23915d2ad9179c736a3036f49f31997 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
# -*- 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, IS_LINUX
from leap.common.events import catalog, emit_async

from leap.bitmask.vpn.launchers import darwin

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 _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.
    """

    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")

        print "LAUNCHING FIREWALL..."
        result = '<did not run>'
        try:
            retcode, result = commands.getstatusoutput(
                ' '.join(cmd + gateways))
        except Exception:
            log.failure('Error launching the firewall')
        finally:
            log.debug(result)
        print "LAUNCHED FIREWALL"
        emit_async(catalog.VPN_STATUS_CHANGED)
        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)
        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