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# -*- 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__)
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.
"""
_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()
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")
def is_missing_policy_permissions(self):
"""
Returns True if we could not find the appropriate policykit file
in place
"""
return not os.path.isfile(self.LINUX_POLKIT_FILE)
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