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Full Discussion: No concurrent login
Top Forums UNIX for Advanced & Expert Users No concurrent login Post 33719 by RTM on Thursday 16th of January 2003 09:39:35 AM
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
 

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LEARN ABOUT OSX

nologin

NOLOGIN(5)						      BSD File Formats Manual							NOLOGIN(5)

NAME

     nologin -- disallow logins

DESCRIPTION

     Programs such as login(1) disallow logins if the nologin file exists.  The programs display the contents of nologin to the user if possible
     and interrupt the login sequence.	This makes it simple to temporarily prevent incoming logins systemwide.

     To disable logins on a per-account basis, investigate nologin(8).

SECURITY

     The nologin file is ignored for user root by default.

IMPLEMENTATION NOTES

     The nologin feature is implemented through login.conf(5), which allows to change the pathname of the file and to extend the list of users
     exempt from temporary login restriction.

     PAM-aware programs can be selectively configured to respect nologin using the pam_nologin(8) module via pam.conf(5).

     The nologin file will be removed at system boot if it resides in /var/run and cleanvar_enable is set to ``YES'' in rc.conf(5), which is
     default.  Therefore system reboot can effectively re-enable logins.

FILES

     /var/run/nologin  default location of nologin

SEE ALSO

     login(1), login.conf(5), pam.conf(5), rc.conf(5), nologin(8), pam_nologin(8), shutdown(8)

BSD
								   May 10, 2007 							       BSD
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