# Copyright 2020, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import re
from typing import Callable, Union
from ..exception import InvalidCheckValue
from ..descriptors import CriteriaDescriptor, CriteriaPermissionSetDescriptor
class ConfigDescriptor(CriteriaDescriptor):
"""
Single item configuration option descriptor.
Parameter:
lookup_function The name of the SELinuxPolicy lookup function,
e.g. lookup_type or lookup_boolean.
Read-only instance attribute use (obj parameter):
checkname The name of the check.
policy The instance of SELinuxPolicy
"""
def __init__(self, lookup_function: Union[Callable, str]) -> None:
super().__init__(lookup_function=lookup_function)
def __set__(self, obj, value):
if not value:
self.instances[obj] = None
else:
try:
super().__set__(obj, value.strip())
except ValueError as ex:
raise InvalidCheckValue("{}: Invalid {} setting: {}".format(
obj.checkname, self.name, ex)) from ex
class ConfigSetDescriptor(CriteriaDescriptor):
"""
Descriptor for a configuration option set.
Parameter:
lookup_function The name of the SELinuxPolicy lookup function,
e.g. lookup_type or lookup_boolean.
Keyword Parameters:
strict (Bool) If True, all objects must exist in the policy
when setting the value. If False, any objects that
fail the policy lookup will be dropped instead of raising
an exception. The default is True.
expand (Bool) If True, each object will be expanded. Default
is False.
Read-only instance attribute use (obj parameter):
checkname The name of the check.
log A logger instance.
policy The instance of SELinuxPolicy
"""
def __init__(self, lookup_function: Union[Callable, str], strict: bool = True,
expand: bool = False) -> None:
super().__init__(lookup_function=lookup_function, default_value=frozenset())
self.strict = strict
self.expand = expand
def __set__(self, obj, value):
if not value:
self.instances[obj] = frozenset()
else:
log = obj.log
if callable(self.lookup_function):
lookup = self.lookup_function
else:
lookup = getattr(obj.policy, self.lookup_function)
ret = set()
for item in (i for i in re.split(r"\s", value) if i):
try:
o = lookup(item)
if self.expand:
ret.update(o.expand())
else:
ret.add(o)
except ValueError as e:
if self.strict:
log.error("Invalid {} item: {}".format(self.name, e))
log.debug("Traceback:", exc_info=e)
raise InvalidCheckValue("{}: Invalid {} item: {}".format(
obj.checkname, self.name, e)) from e
log.info("{}: Invalid {} item: {}".format(
obj.checkname, self.name, e))
self.instances[obj] = frozenset(ret)
class ConfigPermissionSetDescriptor(CriteriaPermissionSetDescriptor):
"""
Descriptor for a configuration permissions set.
Read-only instance attribute use (obj parameter):
checkname The name of the check.
policy The instance of SELinuxPolicy
tclass If it exists, it will be used to validate the
permissions. See validate_perms_any()
"""
def __init__(self) -> None:
super().__init__(default_value=frozenset())
def __set__(self, obj, value):
if not value:
self.instances[obj] = frozenset()
else:
try:
super().__set__(obj, (v for v in value.split(" ") if v))
except ValueError as ex:
raise InvalidCheckValue("{}: Invalid {} setting: {}".format(
obj.checkname, self.name, ex)) from ex
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