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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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+import argparse
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+import logging
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+import logging.handlers
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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="Evaluate qrexec policy")
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+
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+parser.add_argument("--assume-yes-for-ask", action="store_true",
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+ dest="assume_yes_for_ask", default=False,
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+ help="Allow run of service without confirmation if policy say 'ask'")
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+parser.add_argument("--just-evaluate", action="store_true",
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+ dest="just_evaluate", default=False,
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+ help="Do not run the service, only evaluate policy; "
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+ "retcode=0 means 'allow'")
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+parser.add_argument('domain_id', metavar='src-domain-id',
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+ help='Source domain ID (Xen ID or similar, not Qubes ID)')
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+parser.add_argument('domain', metavar='src-domain-name',
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+ help='Source domain name')
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+parser.add_argument('target', metavar='dst-domain-name',
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+ help='Target domain name')
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+parser.add_argument('service_name', metavar='service-name',
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+ help='Service name')
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+parser.add_argument('process_ident', metavar='process-ident',
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+ help='Qrexec process identifier - for connecting data channel')
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+
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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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+ # Add source domain information, required by qrexec-client for establishing
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+ # connection
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+ caller_ident = args.process_ident + "," + args.domain + "," + args.domain_id
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+ log = logging.getLogger('qubespolicy')
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+ log.setLevel(logging.INFO)
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+ handler = logging.handlers.SysLogHandler(address='/dev/log')
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+ log.addHandler(handler)
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+ log_prefix = 'qrexec: {}: {} -> {}: '.format(
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+ args.service_name, args.domain, args.target)
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+ try:
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+ system_info = qubespolicy.get_system_info()
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+ except qubespolicy.QubesMgmtException as e:
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+ log.error(log_prefix + 'error getting system info: ' + str(e))
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+ return 1
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+ try:
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+ policy = qubespolicy.Policy(args.service_name)
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+ action = policy.evaluate(system_info, args.domain, args.target)
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+ if action.action == qubespolicy.Action.ask:
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+ #(... ask the user, see action.targets_for_ask ...)
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+ # TODO: this is placeholder
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+ #action.handle_user_response(response, target_chosen_by_user)
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+ action.handle_user_response(False)
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+ log.info(log_prefix + 'allowed')
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+ action.execute(caller_ident)
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+ except qubespolicy.PolicySyntaxError as e:
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+ log.error(log_prefix + 'error loading policy: ' + str(e))
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+ return 1
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+ except qubespolicy.AccessDenied as e:
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+ log.info(log_prefix + 'denied: ' + str(e))
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+ return 1
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+ return 0
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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