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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>
101 lines
3.3 KiB
Python
101 lines
3.3 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, Genfscon
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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 ModifiedGenfscon(NamedTuple):
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"""Difference details for a modified genfscons."""
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rule: Genfscon
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added_context: Context
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removed_context: Context
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class GenfsconsDifference(Difference):
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"""Determine the difference in genfscon rules between two policies."""
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added_genfscons = DiffResultDescriptor("diff_genfscons")
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removed_genfscons = DiffResultDescriptor("diff_genfscons")
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modified_genfscons = DiffResultDescriptor("diff_genfscons")
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def diff_genfscons(self) -> None:
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"""Generate the difference in genfscon rules between the policies."""
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self.log.info(
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"Generating genfscon differences from {0.left_policy} to {0.right_policy}".
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format(self))
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self.added_genfscons, self.removed_genfscons, matched = self._set_diff(
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(GenfsconWrapper(fs) for fs in self.left_policy.genfscons()),
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(GenfsconWrapper(fs) for fs in self.right_policy.genfscons()))
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self.modified_genfscons = []
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for left_rule, right_rule in matched:
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# Criteria for modified rules
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# 1. change to context
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if ContextWrapper(left_rule.context) != ContextWrapper(right_rule.context):
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self.modified_genfscons.append(ModifiedGenfscon(left_rule,
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right_rule.context,
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left_rule.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 genfscon rule differences")
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self.added_genfscons = None
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self.removed_genfscons = None
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self.modified_genfscons = None
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class GenfsconWrapper(Wrapper[Genfscon]):
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"""Wrap genfscon rules to allow set operations."""
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__slots__ = ("fs", "path", "filetype", "context")
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def __init__(self, rule: Genfscon) -> None:
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self.origin = rule
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self.fs = rule.fs
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self.path = rule.path
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self.filetype = rule.filetype
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self.context = ContextWrapper(rule.context)
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self.key = hash(rule)
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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.key < other.key
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def __eq__(self, other):
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return self.fs == other.fs and \
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self.path == other.path and \
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self.filetype == other.filetype
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