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https://github.com/SELinuxProject/setools
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36a4d851fa
Several class annotations were subscripted but pylint had a bug that did not handle this. This is now fixed in pylint 2.8+. Signed-off-by: Chris PeBenito <pebenito@ieee.org>
98 lines
3.2 KiB
Python
98 lines
3.2 KiB
Python
# Copyright 2016, Tresys Technology, LLC
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#
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# This file is part of SETools.
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#
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# SETools is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation, either version 2.1 of
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# the License, or (at your option) any later version.
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#
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# SETools is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with SETools. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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from typing import NamedTuple
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from ..policyrep import Context, Portcon
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from .context import ContextWrapper
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from .descriptors import DiffResultDescriptor
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from .difference import Difference, Wrapper
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class ModifiedPortcon(NamedTuple):
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"""Difference details for a modified portcon."""
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rule: Portcon
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added_context: Context
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removed_context: Context
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class PortconsDifference(Difference):
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"""Determine the difference in portcons between two policies."""
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added_portcons = DiffResultDescriptor("diff_portcons")
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removed_portcons = DiffResultDescriptor("diff_portcons")
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modified_portcons = DiffResultDescriptor("diff_portcons")
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def diff_portcons(self) -> None:
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"""Generate the difference in portcons between the policies."""
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self.log.info("Generating portcon differences from {0.left_policy} to {0.right_policy}".
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format(self))
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self.added_portcons, self.removed_portcons, matched_portcons = self._set_diff(
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(PortconWrapper(n) for n in self.left_policy.portcons()),
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(PortconWrapper(n) for n in self.right_policy.portcons()))
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self.modified_portcons = []
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for left_portcon, right_portcon in matched_portcons:
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# Criteria for modified portcons
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# 1. change to context
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if ContextWrapper(left_portcon.context) != ContextWrapper(right_portcon.context):
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self.modified_portcons.append(ModifiedPortcon(left_portcon,
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right_portcon.context,
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left_portcon.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 portcon differences")
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self.added_portcons = None
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self.removed_portcons = None
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self.modified_portcons = None
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class PortconWrapper(Wrapper[Portcon]):
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"""Wrap portcon statements for diff purposes."""
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__slots__ = ("protocol", "low", "high")
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def __init__(self, ocon: Portcon) -> None:
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self.origin = ocon
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self.protocol = ocon.protocol
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self.low, self.high = ocon.ports
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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.protocol == other.protocol and \
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self.low == other.low and \
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self.high == other.high
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