[RHCE] Automatically. Logging off users after n secondsin unix m/c.

[Jon Carnes]

An "at" job should work fine:
  at -f /usr/local/sbin/autologout now + 59 minutes
 
On Fri, 2004-01-23 at 10:47, sholton at mindspring.com wrote:
> What about an 'at' job as a part of /etc/bashrc
> 
> 
> -----Original Message-----
> From: Jon Carnes <jonc at nc.rr.com>
> Sent: Jan 23, 2004 10:10 AM
> To: Red Hat Certified Engineer exam study group <rhce at trilug.org>
> Cc: Murtuza Topiwala <muza_buddy at hotmail.com>, 
> 	MUM-LUG-LIST <linuxers at mm.ilug-bom.org.in>, 
> 	LUG-RED-Pete Nesbitt <pete at linux1.ca>, 
> 	Shakir Kapadia <shakirk at rediffmail.com>
> Subject: Re: [RHCE] Automatically. Logging off users after n secondsin unix	m/c.
> 
> On Fri, 2004-01-23 at 06:28, Sampat Dharmesh wrote:
> > Hi Friends,
> >  
> > I have a small querry, I want to logoff a user after N sec. of login.
> > irrespective of the activity he performs.I found of similar option
> > TMOUT but that's specific to user's Inactivity incase user is active
> > he wont get logged off.Due provide a solution if any one knows.
> >  
> > Regards,
> > -Sampat.
> > 
> 
> I don't know of any utility that does this, but if your users are
> running the bash shell you could always create a file like so:
>   vi /usr/local/sbin/autologout
>     # Automatically log off user after 600 seconds
>     sleep 540; echo "Auto logout proceeding in 60seconds"
>     sleep 60; kill -9 $PPID
> 
>   chmod a+x /usr/local/sbin/autologout
> 
> In bash (on Red Hat Linux and probably other OS's as well) the PPID
> variable contains the startup shells Process ID Number. Killing that
> process logs the user out.
> 
> To have it auto-magically work for a user but the following line in at
> the bottom of the their .bashrc file:
>   /usr/local/sbin/autologout &
> 
> The process will kick off and run in the background and after 4 minutes
> give them a warning, then after one more minute it will log them off.
> 
> The weakness to doing it this way is that the user (if they are smart)
> can look for the process and kill it - since the process runs as the
> user. To avoid this, you would have to construct a daemon run via root
> that monitored for logins.
> 
> You could easily write a script that ran once a minute or once every 10
> minutes (out of cron).  The script would look for logins and the time of
> the login, then compare that time to the current time - if limit is
> past, log them off.
> 
> Jon
> 
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