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# Copyright 2015-2016, Tresys Technology, LLC # Copyright 2018, Chris PeBenito <pebenito@ieee.org> # # This file is part of SETools. # # SETools is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as # published by the Free Software Foundation, either version 2.1 of # the License, or (at your option) any later version. # # SETools is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with SETools. If not, see # <http://www.gnu.org/licenses/>. # import logging from abc import ABC, abstractmethod from collections import namedtuple modified_item_record = namedtuple("modified_item", ["left", "right"]) class Difference: """Base class for all policy differences.""" def __init__(self, left_policy, right_policy): self.log = logging.getLogger(__name__) self.left_policy = left_policy self.right_policy = right_policy # # Policies to compare # @property def left_policy(self): return self._left_policy @left_policy.setter def left_policy(self, policy): self.log.info("Policy diff left policy set to {0}".format(policy)) self._left_policy = policy self._reset_diff() @property def right_policy(self): return self._right_policy @right_policy.setter def right_policy(self, policy): self.log.info("Policy diff right policy set to {0}".format(policy)) self._right_policy = policy self._reset_diff() # # Internal functions # def _reset_diff(self): """Reset diff results on policy changes.""" raise NotImplementedError @staticmethod def _expand_generator(rule_list, Wrapper): """Generator that yields a wrapped, expanded rule list.""" # this is to delay creating any containers # as long as possible, since rule lists # are typically massive. for unexpanded_rule in rule_list: for expanded_rule in unexpanded_rule.expand(): yield Wrapper(expanded_rule) @staticmethod def _set_diff(left, right, key=None, unwrap=True): """ Standard diff of two sets. Parameters: left An iterable right An iterable Return: tuple (added, removed, matched) added Set of items in right but not left removed Set of items in left but not right matched Set of items in both left and right. This is in the form of tuples with the matching item from left and right """ left_items = set(left) right_items = set(right) added_items = right_items - left_items removed_items = left_items - right_items # The problem here is the symbol from both policies are # needed to build each tuple in the matched items set. # Using the standard Python set intersection code will only result # in one object. # # This tuple-generating code creates lists from the sets, to sort them. # This should result in all of the symbols lining up. If they don't, # this will break the caller. This should work since there is no remapping. # # This has extra checking to make sure this assertion holds, to fail # instead of giving wrong results. If there is a better way to, # ensure the items match up, please let me know how or submit a patch. matched_items = set() left_matched_items = sorted((left_items - removed_items), key=key) right_matched_items = sorted((right_items - added_items), key=key) assert len(left_matched_items) == len(right_matched_items), \ "Matched items assertion failure (this is an SETools bug), {0} != {1}". \ format(len(left_matched_items), len(right_matched_items)) for left, right in zip(left_matched_items, right_matched_items): assert left == right, \ "Matched items assertion failure (this is an SETools bug), {0} != {1}".format( left, right) matched_items.add((left, right)) if unwrap: return set(i.origin for i in added_items), \ set(i.origin for i in removed_items), \ set((left.origin, right.origin) for (left, right) in matched_items) else: return added_items, removed_items, matched_items class Wrapper(ABC): """Abstract base class for policy object wrappers.""" __slots__ = ("origin", "key") def __repr__(self): # pylint: disable=no-member return "<{0.__class__.__name__}(Wrapping {1})>".format(self, repr(self.origin)) @abstractmethod def __hash__(self): pass @abstractmethod def __eq__(self, other): pass @abstractmethod def __lt__(self, other): pass def __ne__(self, other): return not self == other class SymbolWrapper(Wrapper): """ General wrapper for policy symbols, e.g. types, roles to provide a diff-specific equality operation based on its name. """ __slots__ = ("name") def __init__(self, symbol): self.origin = symbol self.name = str(symbol) self.key = hash(self.name) def __hash__(self): return self.key def __lt__(self, other): return self.name < other.name def __eq__(self, other): return self.name == other.name