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https://github.com/SELinuxProject/setools
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450f94875a
Add backwards compatibility for tuple usage. Signed-off-by: Chris PeBenito <chpebeni@linux.microsoft.com>
88 lines
2.7 KiB
Python
88 lines
2.7 KiB
Python
# Copyright 2016, Tresys Technology, LLC
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# Copyright 2017, Chris PeBenito <pebenito@ieee.org>
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#
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# SPDX-License-Identifier: LGPL-2.1-only
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#
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from dataclasses import dataclass
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from ..policyrep import Context, Nodecon
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from .context import ContextWrapper
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from .descriptors import DiffResultDescriptor
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from .difference import Difference, DifferenceResult, Wrapper
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@dataclass(frozen=True)
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class ModifiedNodecon(DifferenceResult):
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"""Difference details for a modified netifcon."""
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rule: Nodecon
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added_context: Context
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removed_context: Context
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def __lt__(self, other) -> bool:
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return self.rule < other.rule
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class NodeconsDifference(Difference):
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"""Determine the difference in nodecons between two policies."""
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added_nodecons = DiffResultDescriptor("diff_nodecons")
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removed_nodecons = DiffResultDescriptor("diff_nodecons")
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modified_nodecons = DiffResultDescriptor("diff_nodecons")
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def diff_nodecons(self) -> None:
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"""Generate the difference in nodecons between the policies."""
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self.log.info("Generating nodecon differences from {0.left_policy} to {0.right_policy}".
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format(self))
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self.added_nodecons, self.removed_nodecons, matched_nodecons = self._set_diff(
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(NodeconWrapper(n) for n in self.left_policy.nodecons()),
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(NodeconWrapper(n) for n in self.right_policy.nodecons()))
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self.modified_nodecons = []
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for left_nodecon, right_nodecon in matched_nodecons:
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# Criteria for modified nodecons
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# 1. change to context
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if ContextWrapper(left_nodecon.context) != ContextWrapper(right_nodecon.context):
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self.modified_nodecons.append(ModifiedNodecon(left_nodecon,
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right_nodecon.context,
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left_nodecon.context))
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#
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# Internal functions
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#
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def _reset_diff(self) -> None:
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"""Reset diff results on policy changes."""
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self.log.debug("Resetting nodecon differences")
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self.added_nodecons = None
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self.removed_nodecons = None
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self.modified_nodecons = None
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class NodeconWrapper(Wrapper[Nodecon]):
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"""Wrap nodecon statements for diff purposes."""
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__slots__ = ("ip_version", "network")
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def __init__(self, ocon: Nodecon) -> None:
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self.origin = ocon
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self.ip_version = ocon.ip_version
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self.network = ocon.network
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self.key = hash(ocon)
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def __hash__(self):
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return self.key
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def __lt__(self, other):
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return self.origin < other.origin
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def __eq__(self, other):
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return self.ip_version == other.ip_version and \
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self.network == other.network
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