# Copyright 2014-2015, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import logging
import re
from typing import cast, Iterable
from .query import PolicyQuery
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .mixins import MatchObjClass
from .policyrep import AnyDefault, DefaultRange, DefaultRuletype, DefaultValue, DefaultRangeValue
class DefaultQuery(MatchObjClass, PolicyQuery):
"""
Query default_* statements.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
ruletype The rule type(s) to match.
tclass The object class(es) to match.
tclass_regex If true, use a regular expression for
matching the rule's object class.
default The default to base new contexts (e.g. "source" or "target")
default_range The range to use on new context, default_range only
("low", "high", "low_high")
"""
ruletype = CriteriaSetDescriptor(enum_class=DefaultRuletype)
default = CriteriaDescriptor(enum_class=DefaultValue)
default_range = CriteriaDescriptor(enum_class=DefaultRangeValue)
def __init__(self, policy, **kwargs) -> None:
super(DefaultQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self) -> Iterable[AnyDefault]:
"""Generator which yields all matching default_* statements."""
self.log.info("Generating default_* results from {0.policy}".format(self))
self.log.debug("Ruletypes: {0.ruletype!r}".format(self))
self._match_object_class_debug(self.log)
self.log.debug("Default: {0.default!r}".format(self))
self.log.debug("Range: {0.default_range!r}".format(self))
for d in self.policy.defaults():
if self.ruletype and d.ruletype not in self.ruletype:
continue
if not self._match_object_class(d):
continue
if self.default and d.default != self.default:
continue
if self.default_range:
try:
if cast(DefaultRange, d).default_range != self.default_range:
continue
except AttributeError:
continue
yield d
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