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XFCE4 + lightdm + systemd - Can't shutdown from inside XFCE
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wpettersson
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Joined: 04 Jun 2014
Posts: 14

PostPosted: Thu Oct 23, 2014 10:49 pm    Post subject: XFCE4 + lightdm + systemd - Can't shutdown from inside XFCE Reply with quote

So I migrated to systemd a few months ago (~6 I think). Before then, I was running XFCE4 and lightdm and I could shutdown, restart or hibernate from within XFCE4. However, when I migrated to systemd the shutdown, restart and hibernate options were greyed out. However, I can always shutdown/restart/hibernate from the lightdm-greeter. At first I thought it was a bug with lightdm, so I let it slide for a while, but I think now that it's just a misconfiguration from me.

If I ask DBUS whether I can shutdown, I get an error which I think is unusual.
Code:
$ gdbus call --system --dest org.freedesktop.login1 --object-path /org/freedesktop/login1 --method org.freedesktop.login1.Manager.CanPowerOff     
Error: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Permission denied


I haven't changed any files in /etc/dbus-1/ and have posted /etc/dbus-1/system.conf and /etc/dbus-1/system.d/org.freedesktop.login1.conf below. I don't know how to debug this access denied error though. I've checked syslog, and it does show messages about dbus reloading configuration but it doesn't print anything when I send the message via dbus.

/etc/dbus1-system.conf
Code:
<!-- 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/libexec/dbus-daemon-launch-helper</servicehelper>

  <!-- Write a pid file -->
  <pidfile>/var/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"/>
    <!-- But disallow some specific bus services -->
    <deny send_destination="org.freedesktop.DBus"
          send_interface="org.freedesktop.DBus"
          send_member="UpdateActivationEnvironment"/>
  </policy>

  <!-- Config files are placed here that among other things, punch
       holes in the above policy for specific services. -->
  <includedir>system.d</includedir>

  <!-- This is included last so local configuration can override what's
       in this standard file -->
  <include ignore_missing="yes">system-local.conf</include>

  <include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>

</busconfig>



/etc/dbus-1/system.d/org.freedesktop.login1.conf
Code:
<?xml version="1.0"?> <!--*-nxml-*-->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
        "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">

<!--
  This file is part of systemd.

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.
-->

<busconfig>

        <policy user="root">
                <allow own="org.freedesktop.login1"/>
                <allow send_destination="org.freedesktop.login1"/>
                <allow receive_sender="org.freedesktop.login1"/>
        </policy>

        <policy context="default">
                <deny send_destination="org.freedesktop.login1"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.DBus.Introspectable"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.DBus.Peer"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.DBus.Properties"
                       send_member="Get"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.DBus.Properties"
                       send_member="GetAll"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="GetSession"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="GetSessionByPID"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="GetUser"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="GetUserByPID"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="GetSeat"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ListSessions"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ListUsers"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ListSeats"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ListInhibitors"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="Inhibit"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="SetUserLinger"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ActivateSession"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="ActivateSessionOnSeat"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="PowerOff"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="Reboot"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="Suspend"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="Hibernate"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="HybridSleep"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="CanPowerOff"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="CanReboot"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="CanSuspend"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="CanHibernate"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="CanHybridSleep"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="AttachDevice"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Manager"
                       send_member="FlushDevices"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Seat"
                       send_member="ActivateSession"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Seat"
                       send_member="SwitchTo"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Seat"
                       send_member="SwitchToPrevious"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Seat"
                       send_member="SwitchToNext"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="Activate"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="SetIdleHint"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="TakeControl"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="ReleaseControl"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="TakeDevice"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="ReleaseDevice"/>

                <allow send_destination="org.freedesktop.login1"
                       send_interface="org.freedesktop.login1.Session"
                       send_member="PauseDeviceComplete"/>

                <allow receive_sender="org.freedesktop.login1"/>
        </policy>

</busconfig>



Additionally, I seem to get two sessions from loginctl. One is me, the second is owned by root, and is the lightdm-greeter. I don't know if the greeter session is meant to persist when I log in, so I don't know if this is part of the problem.

Code:
# loginctl
   SESSION        UID USER             SEAT           
        c1          0 root             seat0           
        c2       1000 enigma           seat0           

2 sessions listed.
# loginctl show-session c1
Id=c1
Name=root
Timestamp=Fri 2014-10-24 07:49:14 AEST
TimestampMonotonic=4292561
VTNr=7
Display=:0
Remote=no
Service=lightdm-greeter
Scope=session-c1.scope
Leader=226
Audit=0
Type=x11
Class=greeter
Active=no
State=closing
IdleHint=no
IdleSinceHint=0
IdleSinceHintMonotonic=0


Last edited by wpettersson on Wed Oct 29, 2014 10:28 pm; edited 1 time in total
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Roman_Gruber
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Joined: 03 Oct 2006
Posts: 3806
Location: Austro Bavaria

PostPosted: Wed Oct 29, 2014 1:37 pm    Post subject: Reply with quote

systemd related,
plese update your title topic to systemd. Thank you
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