root@haruka:/etc/dbus-1# grep -r "messagebus" *
system.conf:  <user>messagebus</user>
root@haruka:/etc/dbus-1# grep -r "root" *
event.d/26NetworkManagerDispatcher:USER=root
event.d/25NetworkManager:USER=root
session.conf:  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>
system.conf:  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>
system.d/bluetooth.conf:  <policy user="root">
system.d/dhcdbd.conf:    <policy user="root">
system.d/system-tools-backends.conf:    <!-- just for testing purposes, only root will
system.d/system-tools-backends.conf:  <policy group="root">
system.d/avahi-dbus.conf:  <!-- Only root or user avahi can own the Avahi service -->
system.d/avahi-dbus.conf:  <policy user="root">
system.d/NetworkManager.conf:        <policy user="root">
system.d/hal.conf:  <!-- Only root or user haldaemon can own the HAL service -->
system.d/hal.conf:  <policy user="root">
system.d/gnome-power-manager.conf:      <policy user="root">
system.d/nm-applet.conf:        <policy user="root">
root@haruka:/etc/dbus-1# grep -r "root" * | wget 
event.d/      session.conf  system.conf   system.d/