Current File : //snap/core20/current/usr/share/dbus-1/system.conf
<!-- 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>messagebus</user>
<!-- 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>/usr/lib/dbus-1.0/dbus-daemon-launch-helper</servicehelper>
<!-- Write a pid file -->
<pidfile>/run/dbus/pid</pidfile>
<!-- Enable logging to syslog -->
<syslog/>
<!-- 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">
<!-- All users can connect to system bus -->
<allow user="*"/>
<!-- Holes must be punched in service configuration files for
name ownership and sending method calls -->
<deny own="*"/>
<deny send_type="method_call"/>
<!-- Signals and reply messages (method returns, errors) are allowed
by default -->
<allow send_type="signal"/>
<allow send_requested_reply="true" send_type="method_return"/>
<allow send_requested_reply="true" send_type="error"/>
<!-- All messages may be received by default -->
<allow receive_type="method_call"/>
<allow receive_type="method_return"/>
<allow receive_type="error"/>
<allow receive_type="signal"/>
<!-- Allow anyone to talk to the message bus -->
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus" />
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus.Properties"/>
<!-- But disallow some specific bus services -->
<deny send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus"
send_member="UpdateActivationEnvironment"/>
<deny send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus.Debug.Stats"/>
<deny send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.systemd1.Activator"/>
</policy>
<!-- Only systemd, which runs as root, may report activation failures. -->
<policy user="root">
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.systemd1.Activator"/>
</policy>
<!-- root may monitor the system bus. -->
<policy user="root">
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus.Monitoring"/>
</policy>
<!-- If the Stats interface was enabled at compile-time, root may use it.
Copy this into system.local.conf or system.d/*.conf if you want to
enable other privileged users to view statistics and debug info -->
<policy user="root">
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus.Debug.Stats"/>
</policy>
<!-- Include legacy configuration that was preserved in a Debian upgrade,
if any -->
<include ignore_missing="yes">/etc/dbus-1/system.conf.dpkg-bak</include>
<!-- The defaults for these limits are hard-coded in dbus-daemon.
Some clarifications:
Times are in milliseconds (ms); 1000ms = 1 second
133169152 bytes = 127 MiB
33554432 bytes = 32 MiB
150000ms = 2.5 minutes -->
<!-- <limit name="max_incoming_bytes">133169152</limit> -->
<!-- <limit name="max_incoming_unix_fds">64</limit> -->
<!-- <limit name="max_outgoing_bytes">133169152</limit> -->
<!-- <limit name="max_outgoing_unix_fds">64</limit> -->
<!-- <limit name="max_message_size">33554432</limit> -->
<!-- <limit name="max_message_unix_fds">16</limit> -->
<!-- <limit name="service_start_timeout">25000</limit> -->
<!-- <limit name="auth_timeout">5000</limit> -->
<!-- <limit name="pending_fd_timeout">150000</limit> -->
<!-- <limit name="max_completed_connections">2048</limit> -->
<!-- <limit name="max_incomplete_connections">64</limit> -->
<!-- <limit name="max_connections_per_user">256</limit> -->
<!-- <limit name="max_pending_service_starts">512</limit> -->
<!-- <limit name="max_names_per_connection">512</limit> -->
<!-- <limit name="max_match_rules_per_connection">512</limit> -->
<!-- <limit name="max_replies_per_connection">128</limit> -->
<!-- Config files are placed here that among other things, punch
holes in the above policy for specific services. -->
<includedir>system.d</includedir>
<includedir>/etc/dbus-1/system.d</includedir>
<!-- This is included last so local configuration can override what's
in this standard file -->
<include ignore_missing="yes">/etc/dbus-1/system-local.conf</include>
<include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>
</busconfig>
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