/etc/dbus-1/system.d/gdm.conf is in gdm3 3.22.3-3+deb9u2.
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 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | <!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.gnome.DisplayManager"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Manager"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.LocalDisplayFactory"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Settings"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Properties" />
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Introspectable"/>
</policy>
<policy context="default">
<deny send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"/>
<deny send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.LocalDisplayFactory"/>
<deny send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Settings"/>
<deny send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Session"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.ObjectManager"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Manager"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="GetId"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="GetRemoteHostname"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="GetSeatId"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="GetX11DisplayName"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="GetX11DisplayNumber"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"
send_member="IsLocal"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.LocalDisplayFactory"
send_member="CreateTransientDisplay"/>
</policy>
<policy user="Debian-gdm">
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Manager"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Display"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.LocalDisplayFactory"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.gnome.DisplayManager.Settings"/>
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Properties" />
<allow send_destination="org.gnome.DisplayManager"
send_interface="org.freedesktop.DBus.Introspectable"/>
</policy>
</busconfig>
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