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Name	Size	Permission	Action
__pycache__	[ DIR ]	drwxr-xr-x
__init__.py	3.15 KB	-rw-r--r--
bool.py	3.05 KB	-rw-r--r--
bounds.py	4.41 KB	-rw-r--r--
commons.py	2.77 KB	-rw-r--r--
conditional.py	1.95 KB	-rw-r--r--
constraints.py	8.92 KB	-rw-r--r--
context.py	2.08 KB	-rw-r--r--
default.py	4.26 KB	-rw-r--r--
descriptors.py	1.66 KB	-rw-r--r--
difference.py	6.04 KB	-rw-r--r--
fsuse.py	3.21 KB	-rw-r--r--
genfscon.py	3.38 KB	-rw-r--r--
ibendportcon.py	3.3 KB	-rw-r--r--
ibpkeycon.py	3.31 KB	-rw-r--r--
initsid.py	2.58 KB	-rw-r--r--
mls.py	10.82 KB	-rw-r--r--
mlsrules.py	5.27 KB	-rw-r--r--
netifcon.py	3.77 KB	-rw-r--r--
nodecon.py	3.31 KB	-rw-r--r--
objclass.py	3.7 KB	-rw-r--r--
polcap.py	1.72 KB	-rw-r--r--
portcon.py	3.29 KB	-rw-r--r--
properties.py	2.4 KB	-rw-r--r--
rbacrules.py	7.22 KB	-rw-r--r--
roles.py	3.28 KB	-rw-r--r--
terules.py	24.91 KB	-rw-r--r--
typeattr.py	3.42 KB	-rw-r--r--
types.py	4.79 KB	-rw-r--r--
typing.py	1.02 KB	-rw-r--r--
users.py	5.97 KB	-rw-r--r--

Code Editor : types.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
from typing import NamedTuple, Set, Union

from ..policyrep import Type, TypeAttribute, TypeOrAttr

from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper
from .typeattr import typeattr_wrapper_factory
from .typing import SymbolCache

_types_cache: SymbolCache[Type] = defaultdict(dict)

class ModifiedType(NamedTuple):

"""Difference details for a modified type."""

added_attributes: Set[TypeAttribute]
    removed_attributes: Set[TypeAttribute]
    matched_attributes: Set[TypeAttribute]
    modified_permissive: bool
    permissive: bool
    added_aliases: Set[str]
    removed_aliases: Set[str]
    matched_aliases: Set[str]

def type_wrapper_factory(type_: Type) -> SymbolWrapper[Type]:
    """
    Wrap types from the specified policy.

This caches results to prevent duplicate wrapper
    objects in memory.
    """
    try:
        return _types_cache[type_.policy][type_]
    except KeyError:
        t = SymbolWrapper(type_)
        _types_cache[type_.policy][type_] = t
        return t

def type_or_attr_wrapper_factory(type_: TypeOrAttr) -> \
        Union[SymbolWrapper[Type], SymbolWrapper[TypeAttribute]]:

"""
    Wrap types or attributes from the specified policy.

This caches results to prevent duplicate wrapper
    objects in memory.
    """
    if isinstance(type_, Type):
        return type_wrapper_factory(type_)
    else:
        return typeattr_wrapper_factory(type_)

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) -> None:
        """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(),
                                                                             unwrap=False)

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] = ModifiedType(added_attr,
                                                              removed_attr,
                                                              matched_attr,
                                                              mod_permissive,
                                                              left_permissive,
                                                              added_aliases,
                                                              removed_aliases,
                                                              matched_aliases)

#
    # Internal functions
    #
    def _reset_diff(self) -> None:
        """Reset diff results on policy changes."""
        self.log.debug("Resetting type differences")
        self.added_types = None
        self.removed_types = None
        self.modified_types = None

Urban Research Lab

Urban Research Lab

The Urban Research Lab (URL) at IIIT-Delhi was established in 2020, during a time when the pandemic brought the complexities of urban life more visible than ever. What started as an initiative by faculty and students has grown into a collaborative space for critically exploring and reimagining the urban questions through research, dialogue, and interdisciplinary engagement.