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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