mirror of
https://github.com/SELinuxProject/setools
synced 2025-03-24 12:06:34 +00:00
110 lines
3.6 KiB
Python
110 lines
3.6 KiB
Python
# Copyright 2014, 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 re
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import compquery
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class RoleQuery(compquery.ComponentQuery):
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"""Query SELinux policy roles."""
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def __init__(self, policy,
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name="", name_regex=False,
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types=set(), types_equal=False, types_regex=False):
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"""
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Parameter:
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policy The policy to query.
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name The role name to match.
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name_regex If true, regular expression matching
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will be used on the role names.
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types The type to match.
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types_equal If true, only roles with type sets
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that are equal to the criteria will
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match. Otherwise, any intersection
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will match.
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types_regex If true, regular expression matching
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will be used on the type names.
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"""
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self.policy = policy
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self.set_name(name, regex=name_regex)
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self.set_types(types, regex=types_regex, equal=types_equal)
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def results(self):
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"""Generator which yields all matching roles."""
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for r in self.policy.roles():
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if r == "object_r":
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# all types are implicitly added to object_r by the compiler.
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# technically it is incorrect to skip it, but policy writers
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# and analysts don't expect to see it in results, and it
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# will confuse, especially for set equality type queries.
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continue
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if self.name and not self._match_regex(
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r,
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self.name,
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self.name_regex,
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self.name_cmp):
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continue
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if self.types and not self._match_regex_or_set(
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set(str(t) for t in r.types()),
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self.types,
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self.types_equal,
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self.types_regex,
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self.types_cmp):
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continue
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yield r
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def set_types(self, types, **opts):
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"""
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Set the criteria for the role's types.
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Parameter:
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types Name to match the role's types.
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Keyword Options:
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regex If true, regular expression matching will be used.
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equal If true, the type set of the role
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must equal the attributes criteria to
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match. If false, any intersection in the
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critera will cause a rule match.
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Exceptions:
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NameError Invalid keyword option.
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"""
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self.types = types
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for k in opts.keys():
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if k == "regex":
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self.types_regex = opts[k]
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elif k == "equal":
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self.types_equal = opts[k]
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else:
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raise NameError("Invalid types option: {0}".format(k))
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if self.types_regex:
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self.types_cmp = re.compile(self.types)
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else:
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self.types_cmp = None
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