dbus-daemon rejects NetworkManager messages

[Michael Stiller]

Binary package hint: network-manager

Mobile Broadband connections do not work in Ubuntu 9.04, dbus messages from pppd to the NetworkManager
are rejected due to a broken /etc/dbus-1/system.d/NetworkManager.conf. Due to the rejected messages, NetworkManager runs into a timeout and kills the established connection.

/var/log/messages:
Apr 27 19:57:03 blackberry NetworkManager: <WARN> pppd_timed_out(): Looks like pppd didn't initialize our dbus module
/var/log/auth.log:
...
Apr 27 21:59:30 blackberry dbus-daemon: Rejected send message, 8 matched rules; type="method_call", sender=":1.48" (uid=0 pid=5446 comm="/usr/sbin/pppd nodetach lock nodefaultroute user v") interface="org.freedesktop.NetworkManager.PPP" member="SetState" error name="(unset)" requested_reply=0 destination="org.freedesktop.NetworkManager" (uid=0 pid=3241 comm="/usr/sbin/NetworkManager --pid-file /var/run/Netwo"))
Apr 27 21:59:30 blackberry dbus-daemon: Rejected send message, 8 matched rules; type="method_call", sender=":1.48" (uid=0 pid=5446 comm="/usr/sbin/pppd nodetach lock nodefaultroute user v") interface="org.freedesktop.NetworkManager.PPP" member="SetIp4Config" error name="(unset)" requested_reply=0 destination="org.freedesktop.NetworkManager" (uid=0 pid=3241 comm="/usr/sbin/NetworkManager --pid-file /var/run/Netwo"))
...

This is:

Description: Ubuntu 9.04
Release: 9.04
root@blackberry:/etc/dbus-1/system.d# apt-cache policy network-manager
network-manager:
  Installed: 0.7.1~rc4.1.cf199a964-0ubuntu2
  Candidate: 0.7.1~rc4.1.cf199a964-0ubuntu2
  Version table:
 *** 0.7.1~rc4.1.cf199a964-0ubuntu2 0
        500 http://de.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status

FIX:

I got it to work by commenting the following lines in /etc/dbus-1/system.d/NetworkManager.conf:

                <!--
                <deny send_destination="org.freedesktop.NetworkManager"
                      send_interface="org.freedesktop.NetworkManager.PPP"/>
                -->

[Alexander Sack (asac)]

some reporters claimed that rebooting suddenly fixes this. Did you try that without changing the config?

[Michael Stiller (ms-2scale)]

Yes, tried that. I think the config must be changed because it looks like a documented feature.
See man dbus-daemon, the section about policies:

       Policies are applied to a connection as follows:
          - all context="default" policies are applied
          - all group="connection’s user’s group" policies are applied
            in undefined order
          - all user="connection’s auth user" policies are applied
            in undefined order
          - all at_console="true" policies are applied
          - all at_console="false" policies are applied
          - all context="mandatory" policies are applied

       Policies applied later will override those applied earlier, when the
       policies overlap. Multiple policies with the same user/group/context
       are applied in the order they appear in the config file.

Looked to me like the at_console policy denies the sending of the messages, because
it is applied after the user = root policy. In the logs one could clearly see, that there were messages
denied due to some config rules.

[Victor Vargas (kamus)]

Since this report have a long time without activity, please could you check (if is possible) in latest version included in Karmic if this issue is still happening? Thanks in advance.

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]