| # 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, Wrapper |
| |
| |
| modified_nodecon_record = namedtuple("modified_nodecon", ["rule", |
| "added_context", |
| "removed_context"]) |
| |
| |
| class NodeconsDifference(Difference): |
| |
| """Determine the difference in nodecons between two policies.""" |
| |
| added_nodecons = DiffResultDescriptor("diff_nodecons") |
| removed_nodecons = DiffResultDescriptor("diff_nodecons") |
| modified_nodecons = DiffResultDescriptor("diff_nodecons") |
| |
| def diff_nodecons(self): |
| """Generate the difference in nodecons between the policies.""" |
| |
| self.log.info("Generating nodecon differences from {0.left_policy} to {0.right_policy}". |
| format(self)) |
| |
| self.added_nodecons, self.removed_nodecons, matched_nodecons = self._set_diff( |
| (NodeconWrapper(n) for n in self.left_policy.nodecons()), |
| (NodeconWrapper(n) for n in self.right_policy.nodecons())) |
| |
| self.modified_nodecons = [] |
| |
| for left_nodecon, right_nodecon in matched_nodecons: |
| # Criteria for modified nodecons |
| # 1. change to context |
| if ContextWrapper(left_nodecon.context) != ContextWrapper(right_nodecon.context): |
| self.modified_nodecons.append(modified_nodecon_record(left_nodecon, |
| right_nodecon.context, |
| left_nodecon.context)) |
| |
| # |
| # Internal functions |
| # |
| def _reset_diff(self): |
| """Reset diff results on policy changes.""" |
| self.log.debug("Resetting nodecon differences") |
| self.added_nodecons = None |
| self.removed_nodecons = None |
| self.modified_nodecons = None |
| |
| |
| class NodeconWrapper(Wrapper): |
| |
| """Wrap nodecon statements for diff purposes.""" |
| |
| def __init__(self, ocon): |
| self.origin = ocon |
| self.ip_version = ocon.ip_version |
| self.address = ocon.address |
| self.netmask = ocon.netmask |
| self.key = hash(ocon) |
| |
| def __hash__(self): |
| return self.key |
| |
| def __lt__(self, other): |
| return self.origin < other.origin |
| |
| def __eq__(self, other): |
| return self.ip_version == other.ip_version and \ |
| self.address == other.address and \ |
| self.netmask == other.netmask |
