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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
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .mixins import MatchObjClass
from .policyrep import MLSRuletype
from .query import PolicyQuery
from .util import match_indirect_regex, match_range
class MLSRuleQuery(MatchObjClass, PolicyQuery):
"""
Query MLS rules.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
ruletype The list of rule type(s) to match.
source The name of the source type/attribute to match.
source_regex If true, regular expression matching will
be used on the source type/attribute.
target The name of the target type/attribute to match.
target_regex If true, regular expression matching will
be used on the target type/attribute.
tclass The object class(es) to match.
tclass_regex If true, use a regular expression for
matching the rule's object class.
"""
ruletype = CriteriaSetDescriptor(enum_class=MLSRuletype)
source = CriteriaDescriptor("source_regex", "lookup_type_or_attr")
source_regex = False
source_indirect = True
target = CriteriaDescriptor("target_regex", "lookup_type_or_attr")
target_regex = False
target_indirect = True
tclass = CriteriaSetDescriptor("tclass_regex", "lookup_class")
tclass_regex = False
default = CriteriaDescriptor(lookup_function="lookup_range")
default_overlap = False
default_subset = False
default_superset = False
default_proper = False
def __init__(self, policy, **kwargs):
super(MLSRuleQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self):
"""Generator which yields all matching MLS rules."""
self.log.info("Generating MLS rule results from {0.policy}".format(self))
self.log.debug("Ruletypes: {0.ruletype}".format(self))
self.log.debug("Source: {0.source!r}, indirect: {0.source_indirect}, "
"regex: {0.source_regex}".format(self))
self.log.debug("Target: {0.target!r}, indirect: {0.target_indirect}, "
"regex: {0.target_regex}".format(self))
self._match_object_class_debug(self.log)
self.log.debug("Default: {0.default!r}, overlap: {0.default_overlap}, "
"subset: {0.default_subset}, superset: {0.default_superset}, "
"proper: {0.default_proper}".format(self))
for rule in self.policy.mlsrules():
#
# Matching on rule type
#
if self.ruletype:
if rule.ruletype not in self.ruletype:
continue
#
# Matching on source type
#
if self.source and not match_indirect_regex(
rule.source,
self.source,
self.source_indirect,
self.source_regex):
continue
#
# Matching on target type
#
if self.target and not match_indirect_regex(
rule.target,
self.target,
self.target_indirect,
self.target_regex):
continue
#
# Matching on object class
#
if not self._match_object_class(rule):
continue
#
# Matching on range
#
if self.default and not match_range(
rule.default,
self.default,
self.default_subset,
self.default_overlap,
self.default_superset,
self.default_proper):
continue
# if we get here, we have matched all available criteria
yield rule