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__init__.py
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boolquery.py
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boundsquery.py
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categoryquery.py
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commonquery.py
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constraintquery.py
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defaultquery.py
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descriptors.py
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devicetreeconquery.py
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dta.py
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exception.py
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fsusequery.py
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genfsconquery.py
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ibendportconquery.py
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ibpkeyconquery.py
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infoflow.py
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initsidquery.py
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iomemconquery.py
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ioportconquery.py
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mixins.py
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mlsrulequery.py
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netifconquery.py
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nodeconquery.py
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objclassquery.py
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pcideviceconquery.py
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perm_map
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permmap.py
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pirqconquery.py
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polcapquery.py
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policyrep.cpython-310-x86_64-l...
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portconquery.py
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rbacrulequery.py
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rolequery.py
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sensitivityquery.py
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terulequery.py
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typeattrquery.py
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typequery.py
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userquery.py
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util.py
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Code Editor : descriptors.py
# Copyright 2015, Tresys Technology, LLC # Copyright 2016, 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/>. # """ SETools descriptors. These classes override how a class's attributes are get/set/deleted. This is how the @property decorator works. See https://docs.python.org/3/howto/descriptor.html for more details. """ import re from abc import ABC, abstractmethod from collections import defaultdict from collections.abc import Collection from enum import Enum from typing import Any, Callable, MutableMapping, Optional, Union from weakref import WeakKeyDictionary from .util import validate_perms_any # # Query criteria descriptors # # Implementation note: if the name_regex attribute value # is changed the criteria must be reset. # class CriteriaDescriptor: """ Single item criteria descriptor. Keyword Parameters: name_regex The name of instance's regex setting attribute; used as name_regex below. If unset, regular expressions will never be used. lookup_function The name of the SELinuxPolicy lookup function, e.g. lookup_type or lookup_boolean. default_value The default value of the criteria. The default is None. enum_class The class of enumeration which supports a lookup class method. Read-only instance attribute use (obj parameter): policy The instance of SELinuxPolicy name_regex This attribute is read to determine if the criteria should be looked up or compiled into a regex. If the attribute does not exist, False is assumed. """ def __init__(self, name_regex: Optional[str] = None, lookup_function: Optional[Union[Callable, str]] = None, default_value=None, enum_class: Optional[Enum] = None) -> None: assert name_regex or lookup_function or enum_class, \ "A simple attribute should be used if there is no regex, lookup function, or enum." assert not (lookup_function and enum_class), \ "Lookup functions and enum classes are mutually exclusive." self.regex: Optional[str] = name_regex self.default_value = default_value self.lookup_function: Optional[Union[Callable, str]] = lookup_function self.enum_class = enum_class self.name: str = "" # use weak references so instances can be # garbage collected, rather than unnecessarily # kept around due to this descriptor. self.instances: MutableMapping = WeakKeyDictionary() def __set_name__(self, owner, name): self.name = name def __get__(self, obj, objtype=None): if obj is None: return self return self.instances.setdefault(obj, self.default_value) def __set__(self, obj, value): if not value: self.instances[obj] = self.default_value elif self.regex and getattr(obj, self.regex, False): self.instances[obj] = re.compile(value) elif self.lookup_function: if callable(self.lookup_function): lookup = self.lookup_function else: lookup = getattr(obj.policy, self.lookup_function) self.instances[obj] = lookup(value) elif self.enum_class: self.instances[obj] = self.enum_class.lookup(value) else: self.instances[obj] = value class CriteriaSetDescriptor(CriteriaDescriptor): """Descriptor for a set of criteria.""" def __set__(self, obj, value): if not value: self.instances[obj] = self.default_value elif self.regex and getattr(obj, self.regex, False): self.instances[obj] = re.compile(value) elif self.lookup_function: if callable(self.lookup_function): lookup = self.lookup_function else: lookup = getattr(obj.policy, self.lookup_function) self.instances[obj] = frozenset(lookup(v) for v in value) elif self.enum_class: self.instances[obj] = frozenset(self.enum_class.lookup(v) for v in value) else: self.instances[obj] = frozenset(value) class CriteriaPermissionSetDescriptor(CriteriaDescriptor): """ Descriptor for a set of permissions criteria. name_regex The name of instance's regex setting attribute; used as name_regex below. If unset, regular expressions will never be used. default_value The default value of the criteria. The default is None. Read-only instance attribute use (obj parameter): policy The instance of SELinuxPolicy tclass If it exists, it will be used to validate the permissions. See validate_perms_any() tclass_regex If tclass is a regex, the above permission validation will not use tclass: permissions are verified to be in at least one class in the policy but not verified that the permissions are in classes that the regex matches. Assumes False if the attribute doesn't exist. """ def __init__(self, name_regex: Optional[str] = None, default_value=None) -> None: self.regex: Optional[str] = name_regex self.default_value = default_value self.name: str = "" # use weak references so instances can be # garbage collected, rather than unnecessarily # kept around due to this descriptor. self.instances: MutableMapping = WeakKeyDictionary() def __set__(self, obj, value): if not value: self.instances[obj] = self.default_value elif self.regex and getattr(obj, self.regex, False): self.instances[obj] = re.compile(value) else: perms = frozenset(v for v in value) if getattr(obj, "tclass_regex", False): tclass = None else: tclass = getattr(obj, "tclass", None) if tclass and not isinstance(tclass, Collection): tclass = frozenset((tclass,)) validate_perms_any(perms, tclass=tclass, policy=obj.policy) self.instances[obj] = perms # # NetworkX Graph Descriptors # # These descriptors are used to simplify all # of the dictionary use in the NetworkX graph. # class NetworkXGraphEdgeDescriptor(ABC): """ Descriptor abstract base class for NetworkX graph edge attributes. Parameter: name The edge property name Instance class attribute use (obj parameter): G The NetworkX graph source The edge's source node target The edge's target node """ def __init__(self, propname: str) -> None: self.name = propname def __get__(self, obj, objtype=None): if obj is None: return self try: return obj.G[obj.source][obj.target][self.name] except KeyError: raise AttributeError(self.name) @abstractmethod def __set__(self, obj, value): pass @abstractmethod def __delete__(self, obj): pass class EdgeAttrDict(NetworkXGraphEdgeDescriptor): """A descriptor for edge attributes that are dictionaries.""" def __set__(self, obj, value): # None is a special value to initialize the attribute if value is None: obj.G[obj.source][obj.target][self.name] = defaultdict(list) else: raise AttributeError("{0} dictionaries should not be assigned directly". format(self.name)) def __delete__(self, obj): obj.G[obj.source][obj.target][self.name].clear() class EdgeAttrIntMax(NetworkXGraphEdgeDescriptor): """ A descriptor for edge attributes that are non-negative integers that always keep the max assigned value until re-initialized. """ def __set__(self, obj, value): # None is a special value to initialize if value is None: obj.G[obj.source][obj.target][self.name] = 0 else: current_value = obj.G[obj.source][obj.target][self.name] obj.G[obj.source][obj.target][self.name] = max(current_value, value) def __delete__(self, obj): obj.G[obj.source][obj.target][self.name] = 0 class EdgeAttrList(NetworkXGraphEdgeDescriptor): """A descriptor for edge attributes that are lists.""" def __set__(self, obj, value): # None is a special value to initialize if value is None: obj.G[obj.source][obj.target][self.name] = [] else: raise ValueError("{0} lists should not be assigned directly".format(self.name)) def __delete__(self, obj): obj.G[obj.source][obj.target][self.name].clear() # # Permission map descriptors # class PermissionMapDescriptor: """ Descriptor for Permission Map mappings. Parameter: name The map setting name. validator A callable for validating the setting. Instance class attribute use (obj parameter): _perm_map The full permission map. class_ The mapping's object class perm The mapping's permission """ def __init__(self, propname: str, validator: Callable): self.name: str = propname self.validator: Callable = validator def __get__(self, obj, objtype=None): if obj is None: return self return obj._perm_map[obj.class_][obj.perm][self.name] def __set__(self, obj, value): obj._perm_map[obj.class_][obj.perm][self.name] = self.validator(value) def __delete__(self, obj): raise AttributeError
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