/etc/dbus-1/system.d/avahi-dbus.conf is in avahi-daemon 0.7-3.1ubuntu1.
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 | <!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 or user avahi can own the Avahi service -->
<policy user="avahi">
<allow own="org.freedesktop.Avahi"/>
</policy>
<policy user="root">
<allow own="org.freedesktop.Avahi"/>
</policy>
<!-- Allow anyone to invoke methods on Avahi server, except SetHostName -->
<policy context="default">
<allow send_destination="org.freedesktop.Avahi"/>
<allow receive_sender="org.freedesktop.Avahi"/>
<deny send_destination="org.freedesktop.Avahi"
send_interface="org.freedesktop.Avahi.Server" send_member="SetHostName"/>
</policy>
<!-- Allow everything, including access to SetHostName to users of the group "netdev" -->
<policy group="netdev">
<allow send_destination="org.freedesktop.Avahi"/>
<allow receive_sender="org.freedesktop.Avahi"/>
</policy>
<policy user="root">
<allow send_destination="org.freedesktop.Avahi"/>
<allow receive_sender="org.freedesktop.Avahi"/>
</policy>
</busconfig>
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