Thank you for the help.
I have a customer who needs to limit some of their FTP/SCP users to
one login, this is not concurrent logins. I've been looking for a PAM
module to do this, and can't seem to find one yet.
Account expiration times are no good as they are servicing a global
user base. One time passwords are also no good.
I am looking for something that might be able to do this on a group
I don't expect I'll find what I'm looking for, and imagine that only
one simultaneous used ID login with a periodic cron job to clean up
ID's, will be the answer.
I appreciate any and all thought or comments.