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
197
198
|
# -*- coding: utf-8 -*-
# launcher.py
# Copyright (C) 2013-2017 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
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Platform-independent VPN launcher interface.
"""
import getpass
import os
import stat
from twisted.logger import Logger
from abc import ABCMeta, abstractmethod
from leap.bitmask.vpn.constants import IS_MAC
from leap.bitmask.vpn.utils import force_eval
log = Logger()
IS_SNAP = os.environ.get('SNAP')
class VPNLauncherException(Exception):
pass
class OpenVPNNotFoundException(VPNLauncherException):
pass
def _has_updown_scripts(path, warn=True):
"""
Checks the existence of the up/down scripts and its
exec bit if applicable.
:param path: the path to be checked
:type path: str
:param warn: whether we should log the absence
:type warn: bool
:rtype: bool
"""
is_file = os.path.isfile(path)
if warn and not is_file:
log.error('Could not find up/down script %s. '
'Might produce DNS leaks.' % (path,))
# XXX check if applies in win
is_exe = False
try:
is_exe = (stat.S_IXUSR & os.stat(path)[stat.ST_MODE] != 0)
except OSError as e:
log.warn("%s" % (e,))
if warn and not is_exe:
log.error('Up/down script %s is not executable. '
'Might produce DNS leaks.' % (path,))
return is_file and is_exe
def _has_other_files(path, warn=True):
"""
Check the existence of other important files.
:param path: the path to be checked
:type path: str
:param warn: whether we should log the absence
:type warn: bool
:rtype: bool
"""
is_file = os.path.isfile(path)
if warn and not is_file:
log.warn('Could not find file during checks: %s. ' % (
path,))
return is_file
class VPNLauncher(object):
"""
Abstract launcher class
"""
__metaclass__ = ABCMeta
UPDOWN_FILES = None
OTHER_FILES = None
UP_SCRIPT = None
DOWN_SCRIPT = None
PREFERRED_PORTS = ("443", "80", "53", "1194")
@classmethod
@abstractmethod
def get_vpn_command(kls, vpnconfig, providerconfig,
socket_host, socket_port, remotes, openvpn_verb=1):
"""
Return the platform-dependant vpn command for launching openvpn.
Might raise:
OpenVPNNotFoundException,
VPNLauncherException.
:param vpnconfig: vpn configuration object
:type vpnconfig: VPNConfig
:param providerconfig: provider specific configuration
:type providerconfig: ProviderConfig
:param socket_host: either socket path (unix) or socket IP
:type socket_host: str
:param socket_port: either string "unix" if it's a unix socket,
or port otherwise
:type socket_port: str
:param openvpn_verb: the openvpn verbosity wanted
:type openvpn_verb: int
:return: A VPN command ready to be launched.
:rtype: list
"""
openvpn_path = force_eval(kls.OPENVPN_BIN_PATH)
if not os.path.isfile(openvpn_path):
log.warn('Could not find openvpn bin in path %s' % (
openvpn_path))
err = OpenVPNNotFoundException()
raise err
args = []
args += [
'--nobind'
]
if openvpn_verb is not None:
args += ['--verb', '%d' % (openvpn_verb,)]
gateways = remotes
for ip, port in gateways:
# we're hardcoding tcpv4 for now, but that seems to break in
# the version of openvpn shipped with the snaps.
if IS_SNAP:
args += ['--remote', ip, port, 'tcp']
else:
args += ['--remote', ip, port, 'tcp4']
args += [
'--client',
'--tls-client',
'--remote-cert-tls',
'server',
]
openvpn_configuration = vpnconfig.get_openvpn_configuration()
for key, value in openvpn_configuration.items():
if type(value) is bool:
if value:
args += ['--%s' % (key,)]
else:
args += ['--%s' % (key,), value]
user = getpass.getuser()
if socket_port == "unix": # that's always the case for linux
args += [
'--management-client-user', user
]
args += [
'--management-signal',
'--management', socket_host, socket_port,
'--ca', providerconfig.get_ca_cert_path(),
'--cert', vpnconfig.get_client_cert_path(providerconfig),
'--key', vpnconfig.get_client_cert_path(providerconfig)
]
# TODO -- get platform specific launcher args
if IS_MAC:
args += [
'--script-security', '2']
command_and_args = [openvpn_path] + args
return command_and_args
|
