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infoflow: adds boolean selection to seinfoflow
Adds the option to the infoflow analysis to filter conditional policy based on the default or user specified boolean values. Signed-off-by: Daniel Riechers <daniel.riechers@rockwellcollins.com> Signed-off-by: David Graziano <david.graziano@rockwellcollins.com>
This commit is contained in:
Riechers, Daniel J
parent
36c6a4a721
commit
b662b07cc0
24
seinfoflow
24
seinfoflow
@ -53,6 +53,9 @@ opts.add_argument("-w", "--min_weight", default=3, type=int,
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help="Minimum permission weight. Default is 3.")
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opts.add_argument("-l", "--limit_flows", default=0, type=int,
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help="Limit to the specified number of flows. Default is unlimited.")
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opts.add_argument("-b", "--booleans", default=None,
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help="Specify the boolean values to use."
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" Options are default, or \"foo:true bar:false ...\"")
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opts.add_argument("exclude", nargs="*",
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help="List of excluded types in the analysis.")
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@ -75,11 +78,28 @@ elif args.verbose:
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else:
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logging.basicConfig(level=logging.WARNING, format='%(message)s')
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booleans = None
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if args.booleans == 'default':
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booleans = {}
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elif args.booleans is not None:
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booleans = {}
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for boolean in args.booleans.split(','):
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try:
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key, value = boolean.split(':')
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if value.lower() == 'true':
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booleans[key] = True
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elif value.lower() == 'false':
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booleans[key] = False
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else:
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parser.error("Conditional value must be true or false.")
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except ValueError:
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parser.error("Expected boolean format foo:true,bar:false")
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try:
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p = setools.SELinuxPolicy(args.policy)
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m = setools.PermissionMap(args.map)
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g = setools.InfoFlowAnalysis(p, m, min_weight=args.min_weight, exclude=args.exclude)
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g = setools.InfoFlowAnalysis(p, m, min_weight=args.min_weight, exclude=args.exclude,
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booleans=booleans)
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if args.shortest_path or args.all_paths:
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if args.shortest_path:
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paths = g.all_shortest_paths(args.source, args.target)
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@ -24,6 +24,7 @@ import networkx as nx
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from networkx.exception import NetworkXError, NetworkXNoPath, NodeNotFound
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from .descriptors import EdgeAttrIntMax, EdgeAttrList
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from .exception import RuleNotConditional
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from .policyrep import TERuletype
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__all__ = ['InfoFlowAnalysis']
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@ -33,7 +34,7 @@ class InfoFlowAnalysis:
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"""Information flow analysis."""
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def __init__(self, policy, perm_map, min_weight=1, exclude=None):
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def __init__(self, policy, perm_map, min_weight=1, exclude=None, booleans=None):
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"""
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Parameters:
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policy The policy to analyze.
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@ -42,6 +43,10 @@ class InfoFlowAnalysis:
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(default is 1)
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exclude The types excluded from the information flow analysis.
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(default is none)
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booleans If None, all rules will be added to the analysis (default).
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otherwise it should be set to a dict with keys corresponding
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to boolean names and values of True/False. Any unspecified
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booleans will use the policy's default values.
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"""
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self.log = logging.getLogger(__name__)
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@ -50,6 +55,7 @@ class InfoFlowAnalysis:
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self.min_weight = min_weight
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self.perm_map = perm_map
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self.exclude = exclude
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self.booleans = booleans
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self.rebuildgraph = True
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self.rebuildsubgraph = True
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@ -327,6 +333,8 @@ class InfoFlowAnalysis:
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self.log.info("Building information flow subgraph...")
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self.log.debug("Excluding {0!r}".format(self.exclude))
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self.log.debug("Min weight {0}".format(self.min_weight))
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self.log.debug("Exclude disabled conditional policy: {0}".format(
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self.booleans is not None))
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# delete excluded types from subgraph
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nodes = [n for n in self.G.nodes() if n not in self.exclude]
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@ -344,6 +352,36 @@ class InfoFlowAnalysis:
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self.subG.remove_edges_from(delete_list)
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if self.booleans is not None:
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delete_list = []
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for s, t in self.subG.edges():
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edge = Edge(self.subG, s, t)
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rule_list = []
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for rule in iter(edge.rules):
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try:
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if rule.conditional:
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bool_enabled = rule.conditional.evaluate(**self.booleans)
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# if conditional is true then delete the false rules
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if bool_enabled:
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for false_rule in rule.conditional.false_rules():
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if false_rule in iter(edge.rules):
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rule_list.append(false_rule)
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# if conditional is false then delete the true rules
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else:
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for true_rule in rule.conditional.true_rules():
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if true_rule in iter(edge.rules):
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rule_list.append(true_rule)
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except RuleNotConditional as e:
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pass
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deleted_rules = []
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for rule in rule_list:
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if rule not in deleted_rules:
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edge.rules.remove(rule)
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deleted_rules.append(rule)
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if len(edge.rules) == 0:
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delete_list.append(edge)
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self.subG.remove_edges_from(delete_list)
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self.rebuildsubgraph = False
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self.log.info("Completed building information flow subgraph.")
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self.log.debug("Subgraph stats: nodes: {0}, edges: {1}.".format(
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52
tests/conditionalinfoflow.conf
Normal file
52
tests/conditionalinfoflow.conf
Normal file
@ -0,0 +1,52 @@
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class infoflow
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sid kernel
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class infoflow
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{
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hi_w
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hi_r
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med_r
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med_w
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}
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type system;
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role system;
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role system types system;
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#################################################
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type src;
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type tgt;
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type flow_true;
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type flow_false;
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type src_remain;
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type tgt_remain;
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type flow_remain;
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bool condition false;
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allow src_remain flow_remain:infoflow hi_w;
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allow tgt_remain flow_remain:infoflow hi_r;
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if (condition) {
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allow src flow_true:infoflow hi_w;
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allow tgt flow_true:infoflow hi_r;
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allow tgt flow_true:infoflow hi_r;
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allow src_remain flow_remain:infoflow med_w;
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allow tgt_remain flow_remain:infoflow med_r;
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}
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else {
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allow src flow_false:infoflow hi_w;
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allow tgt flow_false:infoflow hi_r;
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}
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#################################################
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#users
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user system roles system;
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#isids
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sid kernel system:system:system
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144
tests/conditionalinfoflow.py
Normal file
144
tests/conditionalinfoflow.py
Normal file
@ -0,0 +1,144 @@
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# Copyright 2014-2015, 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 General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with SETools. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import unittest
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from setools import InfoFlowAnalysis
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from setools import TERuletype as TERT
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from setools.exception import InvalidType
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from setools.permmap import PermissionMap
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from setools.policyrep import Type
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from . import mixins
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from .policyrep.util import compile_policy
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# Note: the testing for having correct rules on every edge is only
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# performed once on the full graph, since it is assumed that NetworkX's
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# Digraph.subgraph() function correctly copies the edge attributes into
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# the subgraph.
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class ConditionalInfoFlowAnalysisTest(unittest.TestCase):
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@classmethod
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def setUpClass(cls):
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cls.p = compile_policy("tests/conditionalinfoflow.conf", mls=False)
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cls.m = PermissionMap("tests/perm_map")
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cls.a = InfoFlowAnalysis(cls.p, cls.m)
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@classmethod
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def tearDownClass(cls):
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os.unlink(cls.p.path)
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def test_001_keep_conditional_rules(self):
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"""Keep all conditional rules."""
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self.a.booleans = None
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self.a._rebuildgraph = True
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self.a._build_subgraph()
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source = self.p.lookup_type("src")
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target = self.p.lookup_type("tgt")
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flow_true = self.p.lookup_type("flow_true")
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flow_false = self.p.lookup_type("flow_false")
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r = self.a.G.edges[source, flow_true]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[flow_true, target]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[source, flow_false]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[flow_false, target]["rules"]
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self.assertEqual(len(r), 1)
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def test_002_default_conditional_rules(self):
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"""Keep only default conditional rules."""
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self.a.booleans = {}
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self.a._rebuildgraph = True
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self.a._build_subgraph()
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source = self.p.lookup_type("src")
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target = self.p.lookup_type("tgt")
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flow_true = self.p.lookup_type("flow_true")
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flow_false = self.p.lookup_type("flow_false")
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r = self.a.G.edges[source, flow_true]["rules"]
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self.assertEqual(len(r), 0)
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r = self.a.G.edges[flow_true, target]["rules"]
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self.assertEqual(len(r), 0)
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r = self.a.G.edges[source, flow_false]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[flow_false, target]["rules"]
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self.assertEqual(len(r), 1)
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def test_003_user_conditional_true(self):
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"""Keep only conditional rules selected by user specified booleans (True Case.)"""
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self.a.booleans = {"condition": True}
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self.a.rebuildgraph = True
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self.a._build_subgraph()
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source = self.p.lookup_type("src")
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target = self.p.lookup_type("tgt")
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flow_true = self.p.lookup_type("flow_true")
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flow_false = self.p.lookup_type("flow_false")
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r = self.a.G.edges[source, flow_true]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[flow_true, target]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[source, flow_false]["rules"]
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self.assertEqual(len(r), 0)
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r = self.a.G.edges[flow_false, target]["rules"]
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self.assertEqual(len(r), 0)
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def test_004_user_conditional_false(self):
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"""Keep only conditional rules selected by user specified booleans (False Case.)"""
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self.a.booleans = {"condition": False}
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self.a.rebuildgraph = True
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self.a._build_subgraph()
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source = self.p.lookup_type("src")
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target = self.p.lookup_type("tgt")
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flow_true = self.p.lookup_type("flow_true")
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flow_false = self.p.lookup_type("flow_false")
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r = self.a.G.edges[source, flow_true]["rules"]
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self.assertEqual(len(r), 0)
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r = self.a.G.edges[flow_true, target]["rules"]
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self.assertEqual(len(r), 0)
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r = self.a.G.edges[source, flow_false]["rules"]
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self.assertEqual(len(r), 1)
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r = self.a.G.edges[flow_false, target]["rules"]
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self.assertEqual(len(r), 1)
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def test_005_remaining_edges(self):
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"""Keep edges when rules are deleted, but there are still remaining rules on the edge."""
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self.a.booleans = {}
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self.a.rebuildgraph = True
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self.a._build_subgraph()
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source = self.p.lookup_type("src_remain")
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target = self.p.lookup_type("tgt_remain")
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flow = self.p.lookup_type("flow_remain")
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r = self.a.G.edges[source, flow]["rules"]
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self.assertEqual(len(r), 1)
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self.assertEqual(str(r[0]), 'allow src_remain flow_remain:infoflow hi_w;')
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r = self.a.G.edges[flow, target]["rules"]
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self.assertEqual(len(r), 1)
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self.assertEqual(str(r[0]), 'allow tgt_remain flow_remain:infoflow hi_r;')
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