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# Copyright 2016, 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/>.
#
from collections import namedtuple
from .context import ContextWrapper
from .descriptors import DiffResultDescriptor
from .difference import Difference, Wrapper
modified_portcon_record = namedtuple("modified_portcon", ["rule",
"added_context",
"removed_context"])
class PortconsDifference(Difference):
"""Determine the difference in portcons between two policies."""
added_portcons = DiffResultDescriptor("diff_portcons")
removed_portcons = DiffResultDescriptor("diff_portcons")
modified_portcons = DiffResultDescriptor("diff_portcons")
def diff_portcons(self):
"""Generate the difference in portcons between the policies."""
self.log.info("Generating portcon differences from {0.left_policy} to {0.right_policy}".
format(self))
self.added_portcons, self.removed_portcons, matched_portcons = self._set_diff(
(PortconWrapper(n) for n in self.left_policy.portcons()),
(PortconWrapper(n) for n in self.right_policy.portcons()))
self.modified_portcons = []
for left_portcon, right_portcon in matched_portcons:
# Criteria for modified portcons
# 1. change to context
if ContextWrapper(left_portcon.context) != ContextWrapper(right_portcon.context):
self.modified_portcons.append(modified_portcon_record(left_portcon,
right_portcon.context,
left_portcon.context))
#
# Internal functions
#
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting portcon differences")
self.added_portcons = None
self.removed_portcons = None
self.modified_portcons = None
class PortconWrapper(Wrapper):
"""Wrap portcon statements for diff purposes."""
__slots__ = ("protocol", "low", "high")
def __init__(self, ocon):
self.origin = ocon
self.protocol = ocon.protocol
self.low, self.high = ocon.ports
self.key = hash(ocon)
def __hash__(self):
return self.key
def __lt__(self, other):
return self.origin < other.origin
def __eq__(self, other):
return self.protocol == other.protocol and \
self.low == other.low and \
self.high == other.high