mirror of
https://github.com/SELinuxProject/setools
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93 lines
3.3 KiB
Python
93 lines
3.3 KiB
Python
# Copyright 2016, 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 collections import namedtuple
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from .context import ContextWrapper
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from .descriptors import DiffResultDescriptor
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from .difference import Difference, Wrapper
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modified_nodecon_record = namedtuple("modified_nodecon", ["rule",
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"added_context",
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"removed_context"])
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class NodeconsDifference(Difference):
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"""Determine the difference in nodecons between two policies."""
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added_nodecons = DiffResultDescriptor("diff_nodecons")
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removed_nodecons = DiffResultDescriptor("diff_nodecons")
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modified_nodecons = DiffResultDescriptor("diff_nodecons")
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def diff_nodecons(self):
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"""Generate the difference in nodecons between the policies."""
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self.log.info("Generating nodecon differences from {0.left_policy} to {0.right_policy}".
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format(self))
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self.added_nodecons, self.removed_nodecons, matched_nodecons = self._set_diff(
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(NodeconWrapper(n) for n in self.left_policy.nodecons()),
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(NodeconWrapper(n) for n in self.right_policy.nodecons()))
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self.modified_nodecons = []
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for left_nodecon, right_nodecon in matched_nodecons:
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# Criteria for modified nodecons
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# 1. change to context
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if ContextWrapper(left_nodecon.context) != ContextWrapper(right_nodecon.context):
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self.modified_nodecons.append(modified_nodecon_record(left_nodecon,
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right_nodecon.context,
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left_nodecon.context))
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#
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# Internal functions
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#
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def _reset_diff(self):
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"""Reset diff results on policy changes."""
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self.log.debug("Resetting nodecon differences")
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self.added_nodecons = None
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self.removed_nodecons = None
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self.modified_nodecons = None
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class NodeconWrapper(Wrapper):
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"""Wrap nodecon statements for diff purposes."""
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__slots__ = ("ip_version", "address", "netmask")
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def __init__(self, ocon):
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self.origin = ocon
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self.ip_version = ocon.ip_version
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self.address = ocon.address
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self.netmask = ocon.netmask
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self.key = hash(ocon)
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def __hash__(self):
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return self.key
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def __lt__(self, other):
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return self.origin < other.origin
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def __eq__(self, other):
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return self.ip_version == other.ip_version and \
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self.address == other.address and \
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self.netmask == other.netmask
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