mirror of
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>
116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
# Copyright 2016, Tresys Technology, LLC
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# Copyright 2018, 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 typing import cast, List, Optional
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from ..policyrep import Bounds, BoundsRuletype, Type
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from .descriptors import DiffResultDescriptor
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from .difference import Difference, DifferenceResult, Wrapper
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from .types import type_wrapper_factory
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@dataclass(frozen=True)
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class ModifiedBounds(DifferenceResult):
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"""Difference details for a modified bounds rule."""
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rule: Bounds
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added_bound: Type
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removed_bound: Type
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def __lt__(self, other) -> bool:
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return self.rule < other.rule
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class BoundsDifference(Difference):
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"""Determine the difference in *bounds between two policies."""
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added_typebounds = DiffResultDescriptor("diff_typebounds")
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removed_typebounds = DiffResultDescriptor("diff_typebounds")
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modified_typebounds = DiffResultDescriptor("diff_typebounds")
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# Lists of rules for each policy
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_left_typebounds: Optional[List[Bounds]] = None
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_right_typebounds: Optional[List[Bounds]] = None
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def diff_typebounds(self) -> None:
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"""Generate the difference in typebound rules between the policies."""
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self.log.info("Generating typebounds differences from {0.left_policy} to {0.right_policy}".
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format(self))
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if self._left_typebounds is None or self._right_typebounds is None:
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self._create_typebound_lists()
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self.added_typebounds, self.removed_typebounds, matched_typebounds = self._set_diff(
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(BoundsWrapper(c) for c in cast(List[Bounds], self._left_typebounds)),
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(BoundsWrapper(c) for c in cast(List[Bounds], self._right_typebounds)),
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key=lambda b: str(b.child))
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self.modified_typebounds = []
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for left_bound, right_bound in matched_typebounds:
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if type_wrapper_factory(left_bound.parent) != type_wrapper_factory(right_bound.parent):
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self.modified_typebounds.append(ModifiedBounds(
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left_bound, right_bound.parent, left_bound.parent))
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#
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# Internal functions
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#
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def _create_typebound_lists(self) -> None:
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"""Create rule lists for both policies."""
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self._left_typebounds = []
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for rule in self.left_policy.bounds():
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if rule.ruletype == BoundsRuletype.typebounds:
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self._left_typebounds.append(rule)
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else:
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self.log.error("Unknown rule type: {0} (This is an SETools bug)".
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format(rule.ruletype))
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self._right_typebounds = []
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for rule in self.right_policy.bounds():
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if rule.ruletype == BoundsRuletype.typebounds:
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self._right_typebounds.append(rule)
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else:
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self.log.error("Unknown rule type: {0} (This is an SETools bug)".
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format(rule.ruletype))
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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 all *bounds differences")
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self.added_typebounds = None
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self.removed_typebounds = None
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# Sets of rules for each policy
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self._left_typebounds = None
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self._right_typebounds = None
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class BoundsWrapper(Wrapper[Bounds]):
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"""Wrap *bounds for diff purposes."""
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__slots__ = ("ruletype", "parent", "child")
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def __init__(self, rule: Bounds) -> None:
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self.origin = rule
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self.ruletype = rule.ruletype
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self.parent = type_wrapper_factory(rule.parent)
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self.child = type_wrapper_factory(rule.child)
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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.ruletype == other.ruletype and \
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self.child == other.child
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