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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 .descriptors import CriteriaSetDescriptor
from .mixins import MatchAlias, MatchName
from .query import PolicyQuery
from .util import match_regex_or_set
class TypeQuery(MatchAlias, MatchName, PolicyQuery):
"""
Query SELinux policy types.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
name The type name to match.
name_regex If true, regular expression matching
will be used on the type names.
alias The alias name to match.
alias_regex If true, regular expression matching
will be used on the alias names.
attrs The attribute to match.
attrs_equal If true, only types with attribute sets
that are equal to the criteria will
match. Otherwise, any intersection
will match.
attrs_regex If true, regular expression matching
will be used on the attribute names instead
of set logic.
permissive The permissive state to match. If this
is None, the state is not matched.
"""
attrs = CriteriaSetDescriptor("attrs_regex", "lookup_typeattr")
attrs_regex = False
attrs_equal = False
_permissive = None
@property
def permissive(self):
return self._permissive
@permissive.setter
def permissive(self, value):
if value is None:
self._permissive = None
else:
self._permissive = bool(value)
def __init__(self, policy, **kwargs):
super(TypeQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self):
"""Generator which yields all matching types."""
self.log.info("Generating type results from {0.policy}".format(self))
self._match_name_debug(self.log)
self._match_alias_debug(self.log)
self.log.debug("Attrs: {0.attrs!r}, regex: {0.attrs_regex}, "
"eq: {0.attrs_equal}".format(self))
self.log.debug("Permissive: {0.permissive}".format(self))
for t in self.policy.types():
if not self._match_name(t):
continue
if not self._match_alias(t):
continue
if self.attrs and not match_regex_or_set(
set(t.attributes()),
self.attrs,
self.attrs_equal,
self.attrs_regex):
continue
if self.permissive is not None and t.ispermissive != self.permissive:
continue
yield t