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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_commons_record = namedtuple("modified_common", ["added_perms",
"removed_perms",
"matched_perms"])
class CommonDifference(Difference):
"""
Determine the difference in common permission sets
between two policies.
"""
added_commons = DiffResultDescriptor("diff_commons")
removed_commons = DiffResultDescriptor("diff_commons")
modified_commons = DiffResultDescriptor("diff_commons")
def diff_commons(self):
"""Generate the difference in commons between the policies."""
self.log.info(
"Generating common differences from {0.left_policy} to {0.right_policy}".format(self))
self.added_commons, self.removed_commons, matched_commons = self._set_diff(
(SymbolWrapper(c) for c in self.left_policy.commons()),
(SymbolWrapper(c) for c in self.right_policy.commons()))
self.modified_commons = dict()
for left_common, right_common in matched_commons:
# Criteria for modified commons
# 1. change to permissions
added_perms, removed_perms, matched_perms = self._set_diff(left_common.perms,
right_common.perms,
unwrap=False)
if added_perms or removed_perms:
self.modified_commons[left_common] = modified_commons_record(added_perms,
removed_perms,
matched_perms)
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting common differences")
self.added_commons = None
self.removed_commons = None
self.modified_commons = None