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and subject line Closing oldstable bugs
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From: T_VoiD <[EMAIL PROTECTED]>
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Subject: xscreensaver: a solution to run xscreensaver by xdm, keeping XAUTHORITY
authentification
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Package: xscreensaver
Version: 3.07-3
Severity: wishlist
reading "man xscreensaver", you can see the author didn't find how to keep
XAUTHORITY stuff while running xscreensaver as nobody user
I have a solution that works on my computer, I think it is secure, you
could perhaps forward this mail to the upstream author too :)
I added this at the end of /etc/X11/xdm/Xsetup_0
------------------------------------------------------------------------------
if [ -x /usr/bin/X11/xscreensaver ]; then
XSRUN=/var/run/xscreensaver-xdm_0
PIDFILE=/var/run/xscreensaver-xdm_0.pid
rm -rf $XSRUN
mkdir -m 700 $XSRUN
mkdir -m 700 $XSRUN/xscreensaver
cp $XAUTHORITY $XSRUN/xscreensaver/Xauthority
chown -R nobody $XSRUN/xscreensaver
OLDPWD=$PWD
cd $XSRUN/xscreensaver
XAUTHORITY=Xauthority xscreensaver -no-lock-mode -no-splash &
echo $! >$PIDFILE
cd $OLDPWD
fi
------------------------------------------------------------------------------
/var/run is writable only by root, so no need to check for unsecure symlinks.
The mkdir -m 700 avoids race conditions allowing somebody to jump to the
newly created directories before they are changed to secure rights.
With this, xscreensaver is run in a "trapped" directory readable only
by itself and is given a copy of the XAUTHORITY file that was just
created by xdm, allowing it to run as nobody.
now the other adds to kill xscreensaver when an user logs in (or xdm
resets):
Add at the end of /etc/X11/xdm/Xsetup_0
------------------------------------------------------------------------------
PIDFILE=/var/run/xscreensaver-xdm_0.pid
if [ -e $PIDFILE ]; then
kill `cat $PIDFILE`
rm -f $PIDFILE
fi
------------------------------------------------------------------------------
Add the same at the end of /etc/X11/xdm/Xreset_0 (I don't know if really
needed)
------------------------------------------------------------------------------
PIDFILE=/var/run/xscreensaver-xdm_0.pid
if [ -e $PIDFILE ]; then
kill `cat $PIDFILE`
rm -f $PIDFILE
fi
------------------------------------------------------------------------------
you just have to change a few names (or compute them with the DISPLAY
variable) to do the same with non local :0 xdm sessions...
Now the real problem is how to package this so it might install
automagically (after a question?) if xdm is installed... hum, I leave this
to you...
-- System Information
Debian Release: potato
Kernel Version: Linux blackhole 2.2.5-ac6 #2 Sun Apr 11 21:40:18 EDT 1999 i586
unknown
Versions of the packages xscreensaver depends on:
ii lesstifg 0.88.0-1 OSF/Motif implementation released under LGPL
ii libc6 2.1.1-0.2 GNU C Library: shared libraries
hi xlib6g 3.3.3.1-0 shared libraries required by X clients
ii xpm4g 3.4k-1 X Pixmap run-time libraries
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Date: Wed, 21 Sep 2005 19:44:05 +0200
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Subject: Closing oldstable bugs
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Josselin and I are closing the oldstable bugs. oldstable doesn't
change except for security fixes, thus these bugs would never be fixed
anyway.
If your bug persists in the recent xscreensaver versions in stable,
testing or unstable, then please file an appropriate bug report.
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