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# Copyright 2014-2015, Tresys Technology, LLC
#
# 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/>.
#
import logging
import re
from .query import PolicyQuery
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .mixins import MatchObjClass
from .policyrep import 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):
super(DefaultQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self):
"""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 d.default_range != self.default_range:
continue
except AttributeError:
continue
yield d