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: objclass.py

# Copyright 2015, 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/>.
#
from collections import defaultdict, namedtuple
from contextlib import suppress

from ..exception import NoCommon

from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper

modified_classes_record = namedtuple("modified_class", ["added_perms",
                                                        "removed_perms",
                                                        "matched_perms"])

_class_cache = defaultdict(dict)

def class_wrapper_factory(class_):
    """
    Wrap class from the specified policy.

This caches results to prevent duplicate wrapper
    objects in memory.
    """

try:
        return _class_cache[class_.policy][class_]
    except KeyError:
        c = SymbolWrapper(class_)
        _class_cache[class_.policy][class_] = c
        return c

class ObjClassDifference(Difference):

"""
    Determine the difference in object classes
    between two policies.
    """

added_classes = DiffResultDescriptor("diff_classes")
    removed_classes = DiffResultDescriptor("diff_classes")
    modified_classes = DiffResultDescriptor("diff_classes")

def diff_classes(self):
        """Generate the difference in object classes between the policies."""

self.log.info(
            "Generating class differences from {0.left_policy} to {0.right_policy}".format(self))

self.added_classes, self.removed_classes, matched_classes = self._set_diff(
            (SymbolWrapper(c) for c in self.left_policy.classes()),
            (SymbolWrapper(c) for c in self.right_policy.classes()))

self.modified_classes = dict()

for left_class, right_class in matched_classes:
            # Criteria for modified classes
            # 1. change to permissions (inherited common is expanded)

left_perms = left_class.perms
            with suppress(NoCommon):
                left_perms |= left_class.common.perms

right_perms = right_class.perms
            with suppress(NoCommon):
                right_perms |= right_class.common.perms

added_perms, removed_perms, matched_perms = self._set_diff(left_perms,
                                                                       right_perms,
                                                                       unwrap=False)

if added_perms or removed_perms:
                self.modified_classes[left_class] = modified_classes_record(added_perms,
                                                                            removed_perms,
                                                                            matched_perms)

#
    # Internal functions
    #
    def _reset_diff(self):
        """Reset diff results on policy changes."""
        self.log.debug("Resetting object class differences")
        self.added_classes = None
        self.removed_classes = None
        self.modified_classes = None

Name	Type	Last Edit	Size	Owner/Group	Permission	Action
..
__init__.py	file	2020-04-01 14:57	3.15 KB	root/root	s---------
bool.py	file	2020-04-01 14:57	2.83 KB	root/root	s---------
bounds.py	file	2020-04-01 14:57	4.1 KB	root/root	s---------
commons.py	file	2020-04-01 14:57	2.82 KB	root/root	s---------
conditional.py	file	2020-04-01 14:57	1.68 KB	root/root	s---------
constraints.py	file	2020-04-01 14:57	8.64 KB	root/root	s---------
context.py	file	2020-04-01 14:57	1.89 KB	root/root	s---------
default.py	file	2020-04-01 14:57	4.14 KB	root/root	s---------
descriptors.py	file	2020-04-01 14:57	1.6 KB	root/root	s---------
difference.py	file	2020-04-01 14:57	5.66 KB	root/root	s---------
fsuse.py	file	2020-04-01 14:57	3.11 KB	root/root	s---------
genfscon.py	file	2020-04-01 14:57	3.25 KB	root/root	s---------
ibendportcon.py	file	2020-04-01 14:57	3.28 KB	root/root	s---------
ibpkeycon.py	file	2020-04-01 14:57	3.29 KB	root/root	s---------
initsid.py	file	2020-04-01 14:57	2.48 KB	root/root	s---------
mls.py	file	2020-04-01 14:57	10.31 KB	root/root	s---------
mlsrules.py	file	2020-04-01 14:57	4.8 KB	root/root	s---------
netifcon.py	file	2020-04-01 14:57	3.71 KB	root/root	s---------
nodecon.py	file	2020-04-01 14:57	3.21 KB	root/root	s---------
objclass.py	file	2020-04-01 14:57	3.6 KB	root/root	s---------
polcap.py	file	2020-04-01 14:57	1.7 KB	root/root	s---------
portcon.py	file	2020-04-01 14:57	3.19 KB	root/root	s---------
properties.py	file	2020-04-01 14:57	2.33 KB	root/root	s---------
rbacrules.py	file	2020-04-01 14:57	6.42 KB	root/root	s---------
roles.py	file	2020-04-01 14:57	3.2 KB	root/root	s---------
terules.py	file	2020-04-01 14:57	23.71 KB	root/root	s---------
typeattr.py	file	2020-04-01 14:57	3.28 KB	root/root	s---------
types.py	file	2020-04-01 14:57	4.86 KB	root/root	s---------
users.py	file	2020-04-01 14:57	5.4 KB	root/root	s---------