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intgr

Member

Registered: 2009-10-02

Posts: 44

[SOLVED] Xorg listening to network with xinit

Hi forum,

Today I found out that for some reason, my X server is listening to port 6000 on all interfaces:

[marti@larry]% sudo netstat -pntl |grep X
tcp        0      0 0.0.0.0:6000            0.0.0.0:*               LISTEN      17163/X             
tcp        0      0 :::6000                 :::*                    LISTEN      17163/X

I assumed that X is launched with TCP disabled on all modern distros. I'm starting X with xinit and my /etc/X11/xinit/xserverrc indeed seems to be configured to disable TCP:

exec /usr/bin/X -nolisten tcp

I haven't tweaked X at all besides a little /etc/X11/xorg.conf:

Section "Device"
        Identifier      "Builtin Default intel Device 0"
        Driver  "intel"
EndSection
Section "Screen"
        Identifier      "Builtin Default intel Screen 0"
        Device  "Builtin Default intel Device 0"
        SubSection "Display"
                #Virtual 2960 1050
        EndSubSection
EndSection
Section "ServerLayout"
        Identifier      "Builtin Default Layout"
        Screen  "Builtin Default intel Screen 0"
EndSection

What gives? Why isn't xinit launching X using its xserverrc?

Last edited by intgr (2009-10-04 17:43:57)

MadTux

Member

Registered: 2009-09-20

Posts: 553

Re: [SOLVED] Xorg listening to network with xinit

I did the same analysis you did, but on my machine, X isn't listening on any network port. My /etc/X11/xinit/xserverrc looks exactly the same as yours, but I don't youse xorg.conf.

rwd

Member

Registered: 2009-02-08

Posts: 664

Re: [SOLVED] Xorg listening to network with xinit

X isn't listening on any network port here either. Maybe it has to do with exactly how you start x. Could it be that  /etc/X11/xinit/xserverrc never gets executed?

Last edited by rwd (2009-10-04 16:22:24)

intgr

Member

Registered: 2009-10-02

Posts: 44

Re: [SOLVED] Xorg listening to network with xinit

This is weird. Now I restarted X, tried with both 'xinit' and 'startx', changed my .xinitrc but still couldn't reproduce this problem.

Thanks for your help.

beroal

Member

From: Ukraine

Registered: 2009-06-07

Posts: 325

Website

Re: [SOLVED] Xorg listening to network with xinit

I've discovered the same problem. Moreover, Xorg does not read the "~/.Xauthority" file, so anyone can connect to my Xorg (!!!) (I discovered this when trying to connect to Xorg from a freshly created user account).

Is it the intended behavior? I run Xorg by:

xinit ~/.xinitrc-gnome -- >/tmp/X-user-out 2>/tmp/X-user-err </dev/null &

"~/.xinitrc-gnome" :

#!/bin/sh
exec ck-launch-session gnome-session

For now I can remedy the vulnerability by:

xinit ~/.xinitrc-gnome -- -nolisten tcp -auth ~/.Xauthority >/tmp/X-user-out 2>/tmp/X-user-err </dev/null &

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