summaryrefslogtreecommitdiff
path: root/src/leap/bitmask/vpn/launchers/linux.py
blob: d39b3b139c86a2847f527488ed439b45184dced1 (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
169
170
171
172
173
174
175
176
177
178
179
180
181
# -*- coding: utf-8 -*-
# linux
# 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/>.

"""
Linux VPN launcher implementation.
"""

import commands
import os
import sys

from twisted.logger import Logger

from leap.bitmask.vpn.utils import first, force_eval
from leap.bitmask.vpn.privilege import LinuxPolicyChecker
from leap.bitmask.vpn.privilege import NoPkexecAvailable
from leap.bitmask.vpn.privilege import NoPolkitAuthAgentAvailable
from leap.bitmask.vpn.launcher import VPNLauncher
from leap.bitmask.vpn.launcher import VPNLauncherException
from leap.common.config import get_path_prefix

logger = Logger()
COM = commands
flags_STANDALONE = False


class EIPNoPolkitAuthAgentAvailable(VPNLauncherException):
    pass


class EIPNoPkexecAvailable(VPNLauncherException):
    pass


SYSTEM_CONFIG = "/etc/leap"
leapfile = lambda f: "%s/%s" % (SYSTEM_CONFIG, f)


class LinuxVPNLauncher(VPNLauncher):

    # The following classes depend on force_eval to be called against
    # the classes, to get the evaluation of the standalone flag on runtine.
    # If we keep extending this kind of classes, we should abstract the
    # handling of the STANDALONE flag in a base class

    class BITMASK_ROOT(object):
        def __call__(self):
            return ("/usr/local/sbin/bitmask-root" if flags_STANDALONE else
                    "/usr/sbin/bitmask-root")

    class OPENVPN_BIN_PATH(object):
        def __call__(self):
            return ("/usr/local/sbin/leap-openvpn" if flags_STANDALONE else
                    "/usr/sbin/openvpn")

    class POLKIT_PATH(object):
        def __call__(self):
            # LinuxPolicyChecker will give us the right path if standalone.
            return LinuxPolicyChecker.get_polkit_path()

    OTHER_FILES = (POLKIT_PATH, BITMASK_ROOT, OPENVPN_BIN_PATH)

    @classmethod
    def get_vpn_command(kls, eipconfig, providerconfig, socket_host,
                        remotes, socket_port="unix", openvpn_verb=1):
        """
        Returns the Linux implementation for the vpn launching command.

        Might raise:
            EIPNoPkexecAvailable,
            EIPNoPolkitAuthAgentAvailable,
            OpenVPNNotFoundException,
            VPNLauncherException.

        :param eipconfig: eip configuration object
        :type eipconfig: EIPConfig
        :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
        """
        # we use `super` in order to send the class to use
        command = super(LinuxVPNLauncher, kls).get_vpn_command(
            eipconfig, providerconfig, socket_host, socket_port, remotes,
            openvpn_verb)

        command.insert(0, force_eval(kls.BITMASK_ROOT))
        command.insert(1, "openvpn")
        command.insert(2, "start")

        policyChecker = LinuxPolicyChecker()
        try:
            pkexec = policyChecker.maybe_pkexec()
        except NoPolkitAuthAgentAvailable:
            raise EIPNoPolkitAuthAgentAvailable()
        except NoPkexecAvailable:
            raise EIPNoPkexecAvailable()
        if pkexec:
            command.insert(0, first(pkexec))

        return command

    @classmethod
    def cmd_for_missing_scripts(kls, frompath):
        """
        Returns a sh script that can copy the missing files.

        :param frompath: The path where the helper files live
        :type frompath: str

        :rtype: str
        """
        bin_paths = force_eval(
            (LinuxVPNLauncher.POLKIT_PATH,
             LinuxVPNLauncher.OPENVPN_BIN_PATH,
             LinuxVPNLauncher.BITMASK_ROOT))

        polkit_path, openvpn_bin_path, bitmask_root = bin_paths

        # no system config for now
        # sys_config = kls.SYSTEM_CONFIG
        (polkit_file, openvpn_bin_file,
         bitmask_root_file) = map(
            lambda p: os.path.split(p)[-1],
            bin_paths)

        cmd = '#!/bin/sh\n'
        cmd += 'mkdir -p /usr/local/sbin\n'

        cmd += 'cp "%s" "%s"\n' % (os.path.join(frompath, polkit_file),
                                   polkit_path)
        cmd += 'chmod 644 "%s"\n' % (polkit_path, )

        cmd += 'cp "%s" "%s"\n' % (os.path.join(frompath, bitmask_root_file),
                                   bitmask_root)
        cmd += 'chmod 744 "%s"\n' % (bitmask_root, )

        if flags_STANDALONE:
            cmd += 'cp "%s" "%s"\n' % (
                os.path.join(frompath, openvpn_bin_file),
                openvpn_bin_path)
            cmd += 'chmod 744 "%s"\n' % (openvpn_bin_path, )

        return cmd

    @classmethod
    def get_vpn_env(kls):
        """
        Returns a dictionary with the custom env for the platform.
        This is mainly used for setting LD_LIBRARY_PATH to the correct
        path when distributing a standalone client

        :rtype: dict
        """
        ld_library_path = os.path.join(get_path_prefix(), "..", "lib")
        ld_library_path.encode(sys.getfilesystemencoding())
        return {
            "LD_LIBRARY_PATH": ld_library_path
        }