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# 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 .descriptors import DiffResultDescriptor from .difference import Difference, SymbolWrapper from .types import type_wrapper_factory modified_roles_record = namedtuple("modified_role", ["added_types", "removed_types", "matched_types"]) _roles_cache = defaultdict(dict) def role_wrapper_factory(role): """ Wrap roles from the specified policy. This caches results to prevent duplicate wrapper objects in memory. """ try: return _roles_cache[role.policy][role] except KeyError: r = SymbolWrapper(role) _roles_cache[role.policy][role] = r return r class RolesDifference(Difference): """Determine the difference in roles between two policies.""" added_roles = DiffResultDescriptor("diff_roles") removed_roles = DiffResultDescriptor("diff_roles") modified_roles = DiffResultDescriptor("diff_roles") def diff_roles(self): """Generate the difference in roles between the policies.""" self.log.info( "Generating role differences from {0.left_policy} to {0.right_policy}".format(self)) self.added_roles, self.removed_roles, matched_roles = self._set_diff( (role_wrapper_factory(r) for r in self.left_policy.roles()), (role_wrapper_factory(r) for r in self.right_policy.roles())) self.modified_roles = dict() for left_role, right_role in matched_roles: # Criteria for modified roles # 1. change to type set, or # 2. change to attribute set (not implemented) added_types, removed_types, matched_types = self._set_diff( (type_wrapper_factory(t) for t in left_role.types()), (type_wrapper_factory(t) for t in right_role.types())) if added_types or removed_types: self.modified_roles[left_role] = modified_roles_record(added_types, removed_types, matched_types) # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" self.log.debug("Resetting role differences") self.added_roles = None self.removed_roles = None self.modified_roles = None