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objclass.py
# Copyright 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 collections import defaultdict, namedtuple from contextlib import suppress from ..exception import NoCommon from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper modified_classes_record = namedtuple("modified_class", ["added_perms", "removed_perms", "matched_perms"]) _class_cache = defaultdict(dict) def class_wrapper_factory(class_): """ Wrap class from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ try: return _class_cache[class_.policy][class_] except KeyError: c = SymbolWrapper(class_) _class_cache[class_.policy][class_] = c return c class ObjClassDifference(Difference): """ Determine the difference in object classes between two policies. """ added_classes = DiffResultDescriptor("diff_classes") removed_classes = DiffResultDescriptor("diff_classes") modified_classes = DiffResultDescriptor("diff_classes") def diff_classes(self): """Generate the difference in object classes between the policies.""" self.log.info( "Generating class differences from {0.left_policy} to {0.right_policy}".format(self)) self.added_classes, self.removed_classes, matched_classes = self._set_diff( (SymbolWrapper(c) for c in self.left_policy.classes()), (SymbolWrapper(c) for c in self.right_policy.classes())) self.modified_classes = dict() for left_class, right_class in matched_classes: # Criteria for modified classes # 1. change to permissions (inherited common is expanded) left_perms = left_class.perms with suppress(NoCommon): left_perms |= left_class.common.perms right_perms = right_class.perms with suppress(NoCommon): right_perms |= right_class.common.perms added_perms, removed_perms, matched_perms = self._set_diff(left_perms, right_perms, unwrap=False) if added_perms or removed_perms: self.modified_classes[left_class] = modified_classes_record(added_perms, removed_perms, matched_perms) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting object class differences") self.added_classes = None self.removed_classes = None self.modified_classes = None
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