mirror of
https://github.com/SELinuxProject/setools
synced 2025-03-29 14:56:21 +00:00
68 lines
2.1 KiB
Python
68 lines
2.1 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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from sepolgen import objectmodel as om
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import policyrep
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# build off of sepolgen perm map implementation
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class PermissionMap(object, om.PermMappings):
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"""Permission Map for information flow analysis."""
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def __init__(self, permmapfile="/usr/share/setools/perm_map"):
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"""
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Parameter:
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permmapfile The path to the permission map to load.
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"""
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om.PermMappings.__init__(self)
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with open(permmapfile, "r") as fd:
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self.from_file(fd)
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def rule_weight(self, rule):
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"""
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Get the type enforcement rule's information flow read and write weights.
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Parameter:
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rule A type enforcement rule.
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Return: Tuple(read_weight, write_weight)
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read_weight The type enforcement rule's read weight.
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write_weight The type enforcement rule's write weight.
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"""
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write_weight = 0
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read_weight = 0
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# iterate over the permissions and determine the
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# weight of the rule in each direction. The result
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# is the largest-weight permission in each direction
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for perm in rule.perms:
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mapping = self.get(str(rule.tclass), perm)
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if mapping.dir & om.FLOW_READ:
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read_weight = max(read_weight, mapping.weight)
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if mapping.dir & om.FLOW_WRITE:
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write_weight = max(write_weight, mapping.weight)
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return (read_weight, write_weight)
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