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# Copyright 2016, 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 collections import defaultdict, namedtuple from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper modified_bool_record = namedtuple("modified_boolean", ["added_state", "removed_state"]) _bool_cache = defaultdict(dict) def boolean_wrapper(policy, boolean): """ Wrap booleans from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ try: return _bool_cache[policy][boolean] except KeyError: b = SymbolWrapper(boolean) _bool_cache[policy][boolean] = b return b class BooleansDifference(Difference): """Determine the difference in type attributes between two policies.""" added_booleans = DiffResultDescriptor("diff_booleans") removed_booleans = DiffResultDescriptor("diff_booleans") modified_booleans = DiffResultDescriptor("diff_booleans") def diff_booleans(self): """Generate the difference in type attributes between the policies.""" self.log.info("Generating Boolean differences from {0.left_policy} to {0.right_policy}". format(self)) self.added_booleans, self.removed_booleans, matched_booleans = \ self._set_diff( (SymbolWrapper(b) for b in self.left_policy.bools()), (SymbolWrapper(b) for b in self.right_policy.bools())) self.modified_booleans = dict() for left_boolean, right_boolean in matched_booleans: # Criteria for modified booleans # 1. change to default state if left_boolean.state != right_boolean.state: self.modified_booleans[left_boolean] = modified_bool_record(right_boolean.state, left_boolean.state) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting Boolean differences") self.added_booleans = None self.removed_booleans = None self.modified_booleans = None