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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 contextlib import suppress
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .exception import NoCommon
from .mixins import MatchName
from .query import PolicyQuery
from .util import match_regex, match_regex_or_set
class ObjClassQuery(MatchName, PolicyQuery):
"""
Query object classes.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
name The name of the object set to match.
name_regex If true, regular expression matching will
be used for matching the name.
common The name of the inherited common to match.
common_regex If true, regular expression matching will
be used for matching the common name.
perms The permissions to match.
perms_equal If true, only commons with permission sets
that are equal to the criteria will
match. Otherwise, any intersection
will match.
perms_regex If true, regular expression matching
will be used on the permission names instead
of set logic.
comparison will not be used.
perms_indirect If false, permissions inherited from a common
permission set not will be evaluated. Default
is true.
"""
common = CriteriaDescriptor("common_regex", "lookup_common")
common_regex = False
perms = CriteriaSetDescriptor("perms_regex")
perms_equal = False
perms_indirect = True
perms_regex = False
def __init__(self, policy, **kwargs):
super(ObjClassQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self):
"""Generator which yields all matching object classes."""
self.log.info("Generating object class results from {0.policy}".format(self))
self._match_name_debug(self.log)
self.log.debug("Common: {0.common!r}, regex: {0.common_regex}".format(self))
self.log.debug("Perms: {0.perms}, regex: {0.perms_regex}, "
"eq: {0.perms_equal}, indirect: {0.perms_indirect}".format(self))
for class_ in self.policy.classes():
if not self._match_name(class_):
continue
if self.common:
try:
if not match_regex(
class_.common,
self.common,
self.common_regex):
continue
except NoCommon:
continue
if self.perms:
perms = class_.perms
if self.perms_indirect:
with suppress(NoCommon):
perms |= class_.common.perms
if not match_regex_or_set(
perms,
self.perms,
self.perms_equal,
self.perms_regex):
continue
yield class_