# Copyright 2014-2015, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import logging
import re
from typing import Iterable
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .mixins import MatchContext
from .policyrep import FSUse, FSUseRuletype
from .query import PolicyQuery
from .util import match_regex
class FSUseQuery(MatchContext, PolicyQuery):
"""
Query fs_use_* statements.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
ruletype The rule type(s) to match.
fs The criteria to match the file system type.
fs_regex If true, regular expression matching
will be used on the file system type.
user The criteria to match the context's user.
user_regex If true, regular expression matching
will be used on the user.
role The criteria to match the context's role.
role_regex If true, regular expression matching
will be used on the role.
type_ The criteria to match the context's type.
type_regex If true, regular expression matching
will be used on the type.
range_ The criteria to match the context's range.
range_subset If true, the criteria will match if it is a subset
of the context's range.
range_overlap If true, the criteria will match if it overlaps
any of the context's range.
range_superset If true, the criteria will match if it is a superset
of the context's range.
range_proper If true, use proper superset/subset operations.
No effect if not using set operations.
"""
ruletype = CriteriaSetDescriptor(enum_class=FSUseRuletype)
fs = CriteriaDescriptor("fs_regex")
fs_regex: bool = False
def __init__(self, policy, **kwargs) -> None:
super(FSUseQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self) -> Iterable[FSUse]:
"""Generator which yields all matching fs_use_* statements."""
self.log.info("Generating fs_use_* results from {0.policy}".format(self))
self.log.debug("Ruletypes: {0.ruletype}".format(self))
self.log.debug("FS: {0.fs!r}, regex: {0.fs_regex}".format(self))
self._match_context_debug(self.log)
for fsu in self.policy.fs_uses():
if self.ruletype and fsu.ruletype not in self.ruletype:
continue
if self.fs and not match_regex(
fsu.fs,
self.fs,
self.fs_regex):
continue
if not self._match_context(fsu.context):
continue
yield fsu
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