# Copyright 2016, Tresys Technology, LLC # # SPDX-License-Identifier: LGPL-2.1-only # from typing import NamedTuple from ..policyrep import Context, Genfscon from .context import ContextWrapper from .descriptors import DiffResultDescriptor from .difference import Difference, Wrapper class ModifiedGenfscon(NamedTuple): """Difference details for a modified genfscons.""" rule: Genfscon added_context: Context removed_context: Context class GenfsconsDifference(Difference): """Determine the difference in genfscon rules between two policies.""" added_genfscons = DiffResultDescriptor("diff_genfscons") removed_genfscons = DiffResultDescriptor("diff_genfscons") modified_genfscons = DiffResultDescriptor("diff_genfscons") def diff_genfscons(self) -> None: """Generate the difference in genfscon rules between the policies.""" self.log.info( "Generating genfscon differences from {0.left_policy} to {0.right_policy}". format(self)) self.added_genfscons, self.removed_genfscons, matched = self._set_diff( (GenfsconWrapper(fs) for fs in self.left_policy.genfscons()), (GenfsconWrapper(fs) for fs in self.right_policy.genfscons())) self.modified_genfscons = [] for left_rule, right_rule in matched: # Criteria for modified rules # 1. change to context if ContextWrapper(left_rule.context) != ContextWrapper(right_rule.context): self.modified_genfscons.append(ModifiedGenfscon(left_rule, right_rule.context, left_rule.context)) # # Internal functions # def _reset_diff(self) -> None: """Reset diff results on policy changes.""" self.log.debug("Resetting genfscon rule differences") self.added_genfscons = None self.removed_genfscons = None self.modified_genfscons = None class GenfsconWrapper(Wrapper[Genfscon]): """Wrap genfscon rules to allow set operations.""" __slots__ = ("fs", "path", "filetype", "context") def __init__(self, rule: Genfscon) -> None: self.origin = rule self.fs = rule.fs self.path = rule.path self.filetype = rule.filetype self.context = ContextWrapper(rule.context) self.key = hash(rule) def __hash__(self): return self.key def __lt__(self, other): return self.key < other.key def __eq__(self, other): return self.fs == other.fs and \ self.path == other.path and \ self.filetype == other.filetype