/usr/lib/python3/dist-packages/setools/diff/mlsrules.py is in python3-setools 4.0.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | # 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 defaultdict, namedtuple
from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper, Wrapper
from .mls import RangeWrapper
modified_mlsrule_record = namedtuple("modified_mlsrule", ["rule",
"added_default",
"removed_default"])
class MLSRulesDifference(Difference):
"""Determine the difference in MLS rules between two policies."""
added_range_transitions = DiffResultDescriptor("diff_range_transitions")
removed_range_transitions = DiffResultDescriptor("diff_range_transitions")
modified_range_transitions = DiffResultDescriptor("diff_range_transitions")
# Lists of rules for each policy
_left_mls_rules = defaultdict(list)
_right_mls_rules = defaultdict(list)
def diff_range_transitions(self):
"""Generate the difference in range_transition rules between the policies."""
self.log.info(
"Generating range_transition differences from {0.left_policy} to {0.right_policy}".
format(self))
if not self._left_mls_rules or not self._right_mls_rules:
self._create_mls_rule_lists()
added, removed, matched = self._set_diff(
self._expand_generator(self._left_mls_rules["range_transition"], MLSRuleWrapper),
self._expand_generator(self._right_mls_rules["range_transition"], MLSRuleWrapper))
modified = []
for left_rule, right_rule in matched:
# Criteria for modified rules
# 1. change to default range
if RangeWrapper(left_rule.default) != RangeWrapper(right_rule.default):
modified.append(modified_mlsrule_record(left_rule,
right_rule.default,
left_rule.default))
self.added_range_transitions = added
self.removed_range_transitions = removed
self.modified_range_transitions = modified
#
# Internal functions
#
def _create_mls_rule_lists(self):
"""Create rule lists for both policies."""
# do not expand yet, to keep memory
# use down as long as possible
self.log.debug("Building MLS rule lists from {0.left_policy}".format(self))
for rule in self.left_policy.mlsrules():
self._left_mls_rules[rule.ruletype].append(rule)
self.log.debug("Building MLS rule lists from {0.right_policy}".format(self))
for rule in self.right_policy.mlsrules():
self._right_mls_rules[rule.ruletype].append(rule)
self.log.debug("Completed building MLS rule lists.")
def _reset_diff(self):
"""Reset diff results on policy changes."""
self.log.debug("Resetting MLS rule differences")
self.added_range_transitions = None
self.removed_range_transitions = None
self.modified_range_transitions = None
# Sets of rules for each policy
self._left_mls_rules.clear()
self._right_mls_rules.clear()
class MLSRuleWrapper(Wrapper):
"""Wrap MLS rules to allow set operations."""
def __init__(self, rule):
self.origin = rule
self.ruletype = rule.ruletype
self.source = SymbolWrapper(rule.source)
self.target = SymbolWrapper(rule.target)
self.tclass = SymbolWrapper(rule.tclass)
self.key = hash(rule)
def __hash__(self):
return self.key
def __lt__(self, other):
return self.key < other.key
def __eq__(self, other):
# because MLSRuleDifference groups rules by ruletype,
# the ruletype always matches.
return self.source == other.source and \
self.target == other.target and \
self.tclass == other.tclass
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