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✏️ commons.py
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# Copyright 2015, Tresys Technology, LLC # # 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 namedtuple from .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper modified_commons_record = namedtuple("modified_common", ["added_perms", "removed_perms", "matched_perms"]) class CommonDifference(Difference): """ Determine the difference in common permission sets between two policies. """ added_commons = DiffResultDescriptor("diff_commons") removed_commons = DiffResultDescriptor("diff_commons") modified_commons = DiffResultDescriptor("diff_commons") def diff_commons(self): """Generate the difference in commons between the policies.""" self.log.info( "Generating common differences from {0.left_policy} to {0.right_policy}".format(self)) self.added_commons, self.removed_commons, matched_commons = self._set_diff( (SymbolWrapper(c) for c in self.left_policy.commons()), (SymbolWrapper(c) for c in self.right_policy.commons())) self.modified_commons = dict() for left_common, right_common in matched_commons: # Criteria for modified commons # 1. change to permissions added_perms, removed_perms, matched_perms = self._set_diff(left_common.perms, right_common.perms, unwrap=False) if added_perms or removed_perms: self.modified_commons[left_common] = modified_commons_record(added_perms, removed_perms, matched_perms) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting common differences") self.added_commons = None self.removed_commons = None self.modified_commons = None
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