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# Copyright 2016, Tresys Technology, LLC # Copyright 2017, 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 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.""" __slots__ = ("ip_version", "network") def __init__(self, ocon): self.origin = ocon self.ip_version = ocon.ip_version self.network = ocon.network 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.network == other.network