<!-- This configuration file controls the systemwide message bus.
     Add a system-local.conf and edit that rather than changing this 
     file directly. -->

<!-- Note that there are any number of ways you can hose yourself
     security-wise by screwing up this file; in particular, you
     probably don't want to listen on any more addresses, add any more
     auth mechanisms, run as a different user, etc. -->

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- Our well-known bus type, do not change this -->
  <type>system</type>

  <!-- Run as special user -->
  <user>dbus</user>

  <!-- Up the max timeout -->
  <limit name="reply_timeout">21600000</limit>

  <!-- Fork into daemon mode -->
  <fork/>

  <!-- We use system service launching using a helper -->
  <standard_system_servicedirs/>

  <!-- This is a setuid helper that is used to launch system services -->
  <servicehelper>/lib/dbus-1/dbus-daemon-launch-helper</servicehelper>

  <!-- Write a pid file -->
  <pidfile>/var/run/messagebus.pid</pidfile>

  <!-- Only allow socket-credentials-based authentication -->
  <auth>EXTERNAL</auth>

  <!-- Only listen on a local socket. (abstract=/path/to/socket 
       means use abstract namespace, don't really create filesystem 
       file; only Linux supports this. Use path=/whatever on other 
       systems.) -->
  <listen>unix:path=/var/run/dbus/system_bus_socket</listen>

  <policy context="default">
    <!-- Deny everything then punch holes -->
    <deny send_interface="*"/>
    <deny receive_interface="*"/>
    <deny own="*"/>
    <!-- But allow all users to connect -->
    <allow user="*"/>
    <!-- Allow anyone to talk to the message bus -->
    <!-- FIXME I think currently these allow rules are always implicit 
         even if they aren't in here -->
    <allow send_destination="org.freedesktop.DBus"/>
    <allow receive_sender="org.freedesktop.DBus"/>
    <!-- allow sending valid replies -->
    <allow send_requested_reply="true" send_type="method_return"/>
    <allow send_requested_reply="true" send_type="error"/>
    <!-- allow receiving valid replies -->
    <allow receive_requested_reply="true"/>
    <!-- Note: the rule above also allows receiving of all non-reply messages
         that are not denied later.  See:
         https://bugs.freedesktop.org/show_bug.cgi?id=18229
         Potentially this will be replaced in the future by the
         following two rules:
    <allow receive_requested_reply="true" receive_type="method_return"/>
    <allow receive_requested_reply="true" receive_type="error"/>
    -->
    <!-- disallow changing the activation environment of system services -->
    <deny send_destination="org.freedesktop.DBus"
          send_interface="org.freedesktop.DBus"
          send_member="UpdateActivationEnvironment"/>
  </policy>

  <!-- Config files are placed here that among other things, punch 
       holes in the above policy for specific services. -->
  <includedir>system.d</includedir>

  <!-- This is included last so local configuration can override what's 
       in this standard file -->
  <include ignore_missing="yes">system-local.conf</include>

  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>

</busconfig>