RE: X11 Forwarding

From: McDougall, Marshall (FSH) (MarMcDouga_at_gov.mb.ca)
Date: 04/19/05

  • Next message: Christ, Bryan: "RE: X11 Forwarding" 
    To: "'Christ, Bryan'" <bryan.christ@hp.com>
Date: Tue, 19 Apr 2005 11:55:03 -0500

    Purely speaking, X and ssh are completely separate items. Ssh will work
    without X and vice versa. Ssh will also work just fine without $DISPLAY set.

    On my HP-UX and RH systems, I always needed to set my $DISPLAY. You should
    be looking at your Xserver more than your ssh setup.

    Regards, Marshall

    -----Original Message-----
    From: Christ, Bryan [mailto:bryan.christ@hp.com]
    Sent: Tuesday, April 19, 2005 11:39 AM
    To: McDougall, Marshall (FSH)
    Cc: secureshell@securityfocus.com
    Subject: RE: X11 Forwarding

    Thanks for the reply Marshall.

    As far as I can tell, at least according to what I have read, there
    shouldn't be any need to set DISPLAY manually. It seems it should be
    set automatically based on the setting/value for X11DisplayOffset (I
    think sshd does the dirty work upon login). If this is not the case,
    then I must have misunderstood.

    -----Original Message-----
    From: McDougall, Marshall (FSH) [mailto:MarMcDouga@gov.mb.ca]
    Sent: Tuesday, April 19, 2005 10:24 AM
    To: Christ, Bryan
    Subject: RE: X11 Forwarding

    You need to set it. Depending on your OS, you can readily script it to
    automatically set it when you login. For example, in my RH servers I
    put the following in /etc/bashrc:

    #setup DISPLAY
    XX=`who am i | sed -ne 's/.*(//;s/).*$/:0/p'` test "x$XX" != x &&
    export DISPLAY="$XX"

    Regards, Marshall

    -----Original Message-----
    From: Christ, Bryan [mailto:bryan.christ@hp.com]
    Sent: Monday, April 18, 2005 9:46 AM
    To: secureshell@securityfocus.com
    Subject: X11 Forwarding

    Does anyone know why my DISPLAY variable is not getting set? I have
    tried looking at the debug messages from

    ssh -vv -X user@host

    but I haven't seen anything suspicious. xauth is installed in the normal
    location and seems to run correctly (although I'm really not familiar
    with it). In my sshd_config file, the relevant options are set as:

    X11Forwarding yes
    X11DisplayOffset 10
    #X11UseLocalHost no
    #UseLogin yes

    I've spent quite a bit of time googling on this problem and haven't come
    up with anything yet. I suspect that it might have something to do with
    installing XFree86 on Slackware 9.0 after initial OS installation (using
    installpkg *.tgz on the relevant packages). I'm really at a loss for
    where to turn.

    Server is OpenSSH 3.5p1, OpenSSL 0.9.7a
    Client is OpenSSH 4.0p1, OpenSSL 0.9.7f

    Thanks in advance!

  • Next message: Christ, Bryan: "RE: X11 Forwarding"