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+# -*- encoding: utf8 -*-
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+#
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+# The Qubes OS Project, http://www.qubes-os.org
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+#
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+# Copyright (C) 2017 Marek Marczykowski-Górecki
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+# <marmarek@invisiblethingslab.com>
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+#
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+# This program 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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+# This program 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 along
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+# with this program; if not, see <http://www.gnu.org/licenses/>.
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+
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+import argparse
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+import json
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+import os
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+
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+import sys
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+
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+import qubespolicy
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+
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+parser = argparse.ArgumentParser(description='Graph qrexec policy')
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+parser.add_argument('--include-ask', action='store_true',
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+ help='Include `ask` action in graph')
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+parser.add_argument('--source', action='store', nargs='+',
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+ help='Limit graph to calls from *source*')
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+parser.add_argument('--target', action='store', nargs='+',
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+ help='Limit graph to calls to *target*')
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+parser.add_argument('--service', action='store', nargs='+',
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+ help='Limit graph to *service*')
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+parser.add_argument('--output', action='store',
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+ help='Write to *output* instead of stdout')
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+parser.add_argument('--policy-dir', action='store',
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+ default=qubespolicy.POLICY_DIR,
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+ help='Look for policy in *policy-dir*')
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+parser.add_argument('--system-info', action='store',
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+ help='Load system information from file instead of querying qubesd')
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+parser.add_argument('--skip-labels', action='store_true',
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+ help='Do not include service names on the graph, also deduplicate '
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+ 'connections.')
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+
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+def handle_single_action(args, action):
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+ '''Get single policy action and output (or not) a line to add'''
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+ if args.skip_labels:
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+ service = ''
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+ else:
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+ service = action.service
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+ if action.action == qubespolicy.Action.ask:
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+ if args.include_ask:
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+ # handle forced target=
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+ if len(action.targets_for_ask) == 1:
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+ return ' "{}" -> "{}" [label="{}" color=orange];\n'.format(
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+ action.source, action.targets_for_ask[0], service)
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+ return ' "{}" -> "{}" [label="{}" color=orange];\n'.format(
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+ action.source, action.original_target, service)
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+ elif action.action == qubespolicy.Action.allow:
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+ return ' "{}" -> "{}" [label="{}" color=red];\n'.format(
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+ action.source, action.target, service)
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+ return ''
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+
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+def main(args=None):
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+ args = parser.parse_args(args)
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+
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+ output = sys.stdout
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+ if args.output:
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+ output = open(args.output, 'w')
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+
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+ if args.system_info:
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+ with open(args.system_info) as f_system_info:
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+ system_info = json.load(f_system_info)
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+ else:
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+ system_info = qubespolicy.get_system_info()
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+
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+ sources = list(system_info['domains'].keys())
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+ if args.source:
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+ sources = args.source
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+
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+ targets = list(system_info['domains'].keys())
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+ if args.target:
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+ targets = args.target
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+ else:
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+ targets.append('$dispvm')
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+ targets.extend('$dispvm:' + dom for dom in system_info['domains']
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+ if system_info['domains'][dom]['dispvm_allowed'])
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+
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+ connections = set()
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+
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+ output.write('digraph g {\n')
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+ for service in os.listdir(args.policy_dir):
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+ if os.path.isdir(os.path.join(args.policy_dir, service)):
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+ continue
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+ if args.service and service not in args.service and \
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+ not any(service.startswith(srv + '+') for srv in args.service):
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+ continue
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+
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+ policy = qubespolicy.Policy(service, args.policy_dir)
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+ for source in sources:
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+ for target in targets:
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+ try:
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+ action = policy.evaluate(system_info, source, target)
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+ line = handle_single_action(args, action)
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+ if line in connections:
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+ continue
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+ if line:
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+ output.write(line)
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+ connections.add(line)
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+ except qubespolicy.AccessDenied:
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+ continue
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+
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+ output.write('}\n')
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+ if args.output:
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+ output.close()
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+
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+if __name__ == '__main__':
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+ sys.exit(main())
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Marek Marczykowski-Górecki