[scponly] Restrict login, max 1 login per user

[Ralf Durkee]

Although implementing a lock file may sort of work, you're going to get 
users that lose their network connection suddenly, so you'll need to be 
sure that the lock file is cleaned up. It's likely to cause users to not 
be able to access the systems once a session has been abnormally dropped.

If you still want to do this, rather than a lock file, it would probably 
be better to have this done by the authentication such as PAM rather 
than the shell (Scponly).  PAM provides a maxlogins which can be set in 
the limits.conf file for most Linux systems, try setting that to 1, to 
see if it gives you what you want.

-- Ralf Durkee, CISSP, GSEC, GCIH
Principal Security Consultant
http://rd1.net

Marc [Titri] wrote:
> Hi and happy new year ;o)
> I'd like to know if there is an easy way to forbid an user to login more 
> than once (user had to close the session before opening another)
> With a lock file or something like that ?
> Thanks,