mirror of
https://github.com/SELinuxProject/setools
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116 lines
4.1 KiB
Python
116 lines
4.1 KiB
Python
# Copyright 2014-2015, Tresys Technology, LLC
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#
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# This file is part of SETools.
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#
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# SETools is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation, either version 2.1 of
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# the License, or (at your option) any later version.
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#
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# SETools is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with SETools. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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import logging
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from . import mixins, query
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from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor, RuletypeDescriptor
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class MLSRuleQuery(mixins.MatchObjClass, query.PolicyQuery):
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"""
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Query MLS rules.
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Parameter:
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policy The policy to query.
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Keyword Parameters/Class attributes:
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ruletype The list of rule type(s) to match.
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source The name of the source type/attribute to match.
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source_regex If true, regular expression matching will
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be used on the source type/attribute.
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target The name of the target type/attribute to match.
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target_regex If true, regular expression matching will
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be used on the target type/attribute.
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tclass The object class(es) to match.
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tclass_regex If true, use a regular expression for
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matching the rule's object class.
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"""
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ruletype = RuletypeDescriptor("validate_mls_ruletype")
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source = CriteriaDescriptor("source_regex", "lookup_type_or_attr")
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source_regex = False
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target = CriteriaDescriptor("target_regex", "lookup_type_or_attr")
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target_regex = False
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tclass = CriteriaSetDescriptor("tclass_regex", "lookup_class")
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tclass_regex = False
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default = CriteriaDescriptor(lookup_function="lookup_range")
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default_overlap = False
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default_subset = False
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default_superset = False
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default_proper = False
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def results(self):
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"""Generator which yields all matching MLS rules."""
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self.log.info("Generating results from {0.policy}".format(self))
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self.log.debug("Ruletypes: {0.ruletype}".format(self))
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self.log.debug("Source: {0.source!r}, regex: {0.source_regex}".format(self))
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self.log.debug("Target: {0.target!r}, regex: {0.target_regex}".format(self))
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self.log.debug("Class: {0.tclass!r}, regex: {0.tclass_regex}".format(self))
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self.log.debug("Default: {0.default!r}, overlap: {0.default_overlap}, "
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"subset: {0.default_subset}, superset: {0.default_superset}, "
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"proper: {0.default_proper}".format(self))
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for rule in self.policy.mlsrules():
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#
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# Matching on rule type
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#
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if self.ruletype:
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if rule.ruletype not in self.ruletype:
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continue
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#
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# Matching on source type
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#
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if self.source and not self._match_regex(
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rule.source,
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self.source,
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self.source_regex):
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continue
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#
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# Matching on target type
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#
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if self.target and not self._match_regex(
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rule.target,
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self.target,
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self.target_regex):
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continue
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#
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# Matching on object class
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#
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if not self._match_object_class(rule):
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continue
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#
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# Matching on range
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#
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if self.default and not self._match_range(
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rule.default,
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self.default,
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self.default_subset,
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self.default_overlap,
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self.default_superset,
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self.default_proper):
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continue
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# if we get here, we have matched all available criteria
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yield rule
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