/etc/dbus-1/system.d/org.freedesktop.DisplayManager.conf is in lightdm 1.10.0-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <!DOCTYPE busconfig PUBLIC
"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Only root can own the service -->
<policy user="root">
<allow own="org.freedesktop.DisplayManager"/>
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DisplayManager" send_member="AddSeat"/>
</policy>
<policy context="default">
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DisplayManager"/>
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DisplayManager.Seat"/>
<allow send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DisplayManager.Session"/>
<deny send_destination="org.freedesktop.DisplayManager" send_interface="org.freedesktop.DisplayManager" send_member="AddSeat"/>
</policy>
</busconfig>
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