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
|
# -*- coding: utf-8 -*-
# privilege_policies.py
# Copyright (C) 2013 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/>.
"""
Helpers to determine if the needed policies for privilege escalation
are operative under this client run.
"""
import logging
import os
import platform
from abc import ABCMeta, abstractmethod
logger = logging.getLogger(__name__)
POLICY_TEMPLATE = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policyconfig PUBLIC
"-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
"http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
<policyconfig>
<vendor>LEAP Project</vendor>
<vendor_url>https://leap.se/</vendor_url>
<action id="net.openvpn.gui.leap.run-openvpn">
<description>Runs the openvpn binary</description>
<description xml:lang="es">Ejecuta el binario openvpn</description>
<message>OpenVPN needs that you authenticate to start</message>
<message xml:lang="es">
OpenVPN necesita autorizacion para comenzar
</message>
<icon_name>package-x-generic</icon_name>
<defaults>
<allow_any>yes</allow_any>
<allow_inactive>yes</allow_inactive>
<allow_active>yes</allow_active>
</defaults>
<annotate key="org.freedesktop.policykit.exec.path">{path}</annotate>
<annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate>
</action>
</policyconfig>
"""
def is_missing_policy_permissions():
"""
Returns True if we do not have implemented a policy checker for this
platform, or if the policy checker exists but it cannot find the
appropriate policy mechanisms in place.
:rtype: bool
"""
_system = platform.system()
platform_checker = _system + "PolicyChecker"
policy_checker = globals().get(platform_checker, None)
if not policy_checker:
# it is true that we miss permission to escalate
# privileges without asking for password each time.
logger.debug("we could not find a policy checker implementation "
"for %s" % (_system,))
return True
return policy_checker().is_missing_policy_permissions()
def get_policy_contents(openvpn_path):
"""
Returns the contents that the policy file should have.
:param openvpn_path: the openvpn path to use in the polkit file
:type openvpn_path: str
:rtype: str
"""
return POLICY_TEMPLATE.format(path=openvpn_path)
def is_policy_outdated(path):
"""
Returns if the existing polkit file is outdated, comparing if the path
is correct.
:param path: the path that should have the polkit file.
:type path: str.
:rtype: bool
"""
_system = platform.system()
platform_checker = _system + "PolicyChecker"
policy_checker = globals().get(platform_checker, None)
if policy_checker is None:
logger.debug("we could not find a policy checker implementation "
"for %s" % (_system,))
return False
return policy_checker().is_outdated(path)
class PolicyChecker:
"""
Abstract PolicyChecker class
"""
__metaclass__ = ABCMeta
@abstractmethod
def is_missing_policy_permissions(self):
"""
Returns True if we could not find any policy mechanisms that
are defined to be in used for this particular platform.
:rtype: bool
"""
return True
class LinuxPolicyChecker(PolicyChecker):
"""
PolicyChecker for Linux
"""
LINUX_POLKIT_FILE = ("/usr/share/polkit-1/actions/"
"net.openvpn.gui.leap.policy")
@classmethod
def get_polkit_path(self):
"""
Returns the polkit file path.
:rtype: str
"""
return self.LINUX_POLKIT_FILE
def is_missing_policy_permissions(self):
"""
Returns True if we could not find the appropriate policykit file
in place
:rtype: bool
"""
return not os.path.isfile(self.LINUX_POLKIT_FILE)
def is_outdated(self, path):
"""
Returns if the existing polkit file is outdated, comparing if the path
is correct.
:param path: the path that should have the polkit file.
:type path: str.
:rtype: bool
"""
polkit = None
try:
with open(self.LINUX_POLKIT_FILE) as f:
polkit = f.read()
except IOError, e:
logger.error("Error reading polkit file(%s): %r" % (
self.LINUX_POLKIT_FILE, e))
return get_policy_contents(path) != polkit
|
