| # 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 .context import ContextWrapper |
| from .descriptors import DiffResultDescriptor |
| from .difference import Difference, SymbolWrapper |
| |
| |
| modified_initsids_record = namedtuple("modified_initsid", ["added_context", "removed_context"]) |
| |
| |
| class InitialSIDsDifference(Difference): |
| |
| """Determine the difference in initsids between two policies.""" |
| |
| added_initialsids = DiffResultDescriptor("diff_initialsids") |
| removed_initialsids = DiffResultDescriptor("diff_initialsids") |
| modified_initialsids = DiffResultDescriptor("diff_initialsids") |
| |
| def diff_initialsids(self): |
| """Generate the difference in initial SIDs between the policies.""" |
| |
| self.log.info("Generating initial SID differences from {0.left_policy} to {0.right_policy}". |
| format(self)) |
| |
| self.added_initialsids, self.removed_initialsids, matched_initialsids = self._set_diff( |
| (SymbolWrapper(i) for i in self.left_policy.initialsids()), |
| (SymbolWrapper(i) for i in self.right_policy.initialsids())) |
| |
| self.modified_initialsids = dict() |
| |
| for left_initialsid, right_initialsid in matched_initialsids: |
| # Criteria for modified initialsids |
| # 1. change to context |
| if ContextWrapper(left_initialsid.context) != ContextWrapper(right_initialsid.context): |
| self.modified_initialsids[left_initialsid] = modified_initsids_record( |
| right_initialsid.context, left_initialsid.context) |
| |
| # |
| # Internal functions |
| # |
| def _reset_diff(self): |
| """Reset diff results on policy changes.""" |
| self.log.debug("Resetting initialsid differences") |
| self.added_initialsids = None |
| self.removed_initialsids = None |
| self.modified_initialsids = None |
