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# Copyright 2015, Tresys Technology, LLC
#
# 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/>.
#
from collections import namedtuple
from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper
modified_types_record = namedtuple("modified_type", ["added_attributes",
"removed_attributes",
"matched_attributes",
"modified_permissive",
"permissive",
"added_aliases",
"removed_aliases",
"matched_aliases"])
class TypesDifference(Difference):
"""Determine the difference in types between two policies."""
added_types = DiffResultDescriptor("diff_types")
removed_types = DiffResultDescriptor("diff_types")
modified_types = DiffResultDescriptor("diff_types")
def diff_types(self):
"""Generate the difference in types between the policies."""
self.log.info(
"Generating type differences from {0.left_policy} to {0.right_policy}".format(self))
self.added_types, self.removed_types, matched_types = self._set_diff(
(SymbolWrapper(t) for t in self.left_policy.types()),
(SymbolWrapper(t) for t in self.right_policy.types()))
self.modified_types = dict()
for left_type, right_type in matched_types:
# Criteria for modified types
# 1. change to attribute set, or
# 2. change to alias set, or
# 3. different permissive setting
added_attr, removed_attr, matched_attr = self._set_diff(
(SymbolWrapper(a) for a in left_type.attributes()),
(SymbolWrapper(a) for a in right_type.attributes()))
added_aliases, removed_aliases, matched_aliases = self._set_diff(left_type.aliases(),
right_type.aliases())
left_permissive = left_type.ispermissive
right_permissive = right_type.ispermissive
mod_permissive = left_permissive != right_permissive
if added_attr or removed_attr or added_aliases or removed_aliases or mod_permissive:
self.modified_types[left_type] = modified_types_record(added_attr,
removed_attr,
matched_attr,
mod_permissive,
left_permissive,
added_aliases,
removed_aliases,
matched_aliases)
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting type differences")
self.added_types = None
self.removed_types = None
self.modified_types = None
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