SessionManager.conf

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
  "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<!--
  Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  Use of this source code is governed by a BSD-style license that can be
  found in the LICENSE file.
-->
<busconfig>
  <policy user="root">
    <allow own="org.chromium.SessionManager" />
    <allow send_destination="org.chromium.SessionManager" />
  </policy>
  <policy user="chronos">
    <!-- introspection is denied -->
    <deny send_destination="org.chromium.SessionManager"
          send_interface="org.freedesktop.DBus.Introspectable" />
    <!-- properties denied -->
    <deny send_destination="org.chromium.SessionManager"
          send_interface="org.freedesktop.DBus.Properties" />
    <!-- allow explicit methods -->
    <allow send_destination="org.chromium.SessionManager"
           send_interface="org.chromium.SessionManagerInterface"
           send_member="EmitLoginPromptReady"/>
    <allow send_destination="org.chromium.SessionManager"
           send_interface="org.chromium.SessionManagerInterface"
           send_member="StartSession"/>
    <allow send_destination="org.chromium.SessionManager"
           send_interface="org.chromium.SessionManagerInterface"
           send_member="StopSession"/>
  </policy>
  <policy context="default">
    <deny send_destination="org.chromium.SessionManager" />
  </policy>
</busconfig>