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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_typeattr_record = namedtuple("modified_typeattr", ["added_types", "removed_types", "matched_types"]) _typeattr_cache = defaultdict(dict) def typeattr_wrapper_factory(attr): """ Wrap type attributes from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ try: return _typeattr_cache[attr.policy][attr] except KeyError: a = SymbolWrapper(attr) _typeattr_cache[attr.policy][attr] = a return a class TypeAttributesDifference(Difference): """Determine the difference in type attributes between two policies.""" added_type_attributes = DiffResultDescriptor("diff_type_attributes") removed_type_attributes = DiffResultDescriptor("diff_type_attributes") modified_type_attributes = DiffResultDescriptor("diff_type_attributes") def diff_type_attributes(self): """Generate the difference in type attributes between the policies.""" self.log.info( "Generating type attribute differences from {0.left_policy} to {0.right_policy}". format(self)) self.added_type_attributes, self.removed_type_attributes, matched_attributes = \ self._set_diff( (SymbolWrapper(r) for r in self.left_policy.typeattributes()), (SymbolWrapper(r) for r in self.right_policy.typeattributes())) self.modified_type_attributes = dict() for left_attribute, right_attribute in matched_attributes: # Criteria for modified attributes # 1. change to type set added_types, removed_types, matched_types = self._set_diff( (SymbolWrapper(t) for t in left_attribute.expand()), (SymbolWrapper(t) for t in right_attribute.expand())) if added_types or removed_types: self.modified_type_attributes[left_attribute] = modified_typeattr_record( added_types, removed_types, matched_types) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting type attribute differences") self.added_type_attributes = None self.removed_type_attributes = None self.modified_type_attributes = None