| # Copyright 2016, 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_bool_record = namedtuple("modified_boolean", ["added_state", "removed_state"]) |
| |
| |
| 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 |
