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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
# -*- 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.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
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 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:
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
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
|
