Authentication and SU

From: Pepebuho (pepebuho_at_pananet.com)
Date: 04/02/04

  • Next message: Bill Dearborn: "grub Error 23 'Selected Disk Does Not Exist' - but it does!" 
    Date: Thu, 1 Apr 2004 23:34:59 -5
To: fedora-list@redhat.com

    Hi.
    I noticed that each time that I execute su and then gedit I get the
    following warning:
    (gedit:2378): GnomeUI-WARNING **: While connecting to session manager:
    Authentication Rejected, reason : None of the authentication protocols
    specified are supported and host-based authentication failed.
    Surfing Google i found the attached solution by Bruce Wolk, nevertheless
    I wonder why does it work. In fact why do we need it at all?
    I am not that good yet with scripts (I am newbie) but it looks
    like it is executing gedit on an new shell session where the contents
    of the current XUAUTHORITY were taken from root's .Xauthority.
    Is it safe? And if that variable is important, why is it not changed
    authomatically
    when I execute su?
    Also, I was checking for .Xauthority on my root directory and I saw not one
    xauthority but several files starting with .xauth
    Thaks!
    Javier
    ------------------------------------------------------------
    http://linux.derkeiler.com/Newsgroups/linux.redhat/2003-09/1193.html

    Save the following script as something, say xroot. Then just
    xroot gedit
    You won't get the error.
    *************
    #!/bin/sh
    if [ $# -lt 1 ]
    then echo "usage: `basename $0` command" >&2
    exit 2
    fi
    su - -c "exec env DISPLAY='$DISPLAY'
    XAUTHORITY='${XAUTHORITY-$HOME/.Xauthority}'
    "'"$SHELL"'" -c '$*'"

    ------------------------------
    /_/
    |O O| pepebuho@pananet.com
    ~~~~ Javier Perez
    ~~~~ While the night runs
    ~~~~ toward the day...
    m m Pepebuho watches
    from his high perch.

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