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No concurrent login

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# 1  
Old 01-16-2003
No concurrent login
Hi,

I notice in my Sun Solaris 8 sparc workstatin, I am able to login concurrently using a same user ID.

Is there a way to disallow this? That is, at anyone time, the user can have only 1 login session.

How can it be done?

Thanks
# 2  
Old 01-16-2003
You would have to write a script that looks for that user account already on the system (insure you still allow root, administrators, possibly DBAs, oracle, sybase...to still have multiple logins).

Put the code or a call to the script into /etc/profile. Note, rsh and rlogin would still be able to get around this.

For other ideas, try this Info on Netsys.com
# 3  
Old 01-19-2003
You could write a simple line in the login script that looks for a lock file, something like /etc/logins/lock_your_user_id and then if it does not exist, allow the login and then create the file. This is a simple file locking mechanism that is used a lot in UNIX systems and could be used here very easily.
# 4  
Old 01-22-2003
this seems to be a good idea. but when will the lock file be deleted? what if user just does not logout but plug out the electric power cable?
# 5  
Old 01-22-2003
Hi,

you can try a different variant of the same concept. Check for the particular user's session count as part of the startup script and decide on allow him or not...


Thanks...
# 6  
Old 01-22-2003
Quote:
Originally posted by champion
this seems to be a good idea. but when will the lock file be deleted? what if user just does not logout but plug out the electric power cable?
Naturally, you would have to clear the lock files when the system reboots after a crash. This is true for all programs that use lockfiles. You simply write a startup script that looks for and clears lock files when the system reboots.

As for logout actions, this is possible also. One possibility is to use the trap facility in the shell.
# 7  
Old 01-23-2003
Hi,

If the user pulls the power cable of server, lock files can be cleaned while startup..

How to clear the lock files, if the user pulls the power cable of the terminal ?. ( client )


Thanks in advance...
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