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# Copyright 2014-2015, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito <pebenito@ieee.org>
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools. If not, see
# <http://www.gnu.org/licenses/>.
#
from abc import ABC, abstractmethod
class PolicyQuery(ABC):
"""Abstract base class for SELinux policy queries."""
def __init__(self, policy, **kwargs):
self.policy = policy
# keys are sorted in reverse order so regex settings
# are set before the criteria, e.g. name_regex
# is set before name. This ensures correct behavior
# since the criteria descriptors are sensitve to
# regex settings.
for name in sorted(kwargs.keys(), reverse=True):
attr = getattr(self, name, None) # None is not callable
if callable(attr):
raise ValueError("Keyword parameter {0} conflicts with a callable.".format(name))
setattr(self, name, kwargs[name])
@abstractmethod
def results(self):
"""
Generator which returns the matches for the query. This method
should be overridden by subclasses.
"""
pass