pam_nologin man page on aLinux

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PAM_NOLOGIN(8)		 System Administrator's Manual		PAM_NOLOGIN(8)

NAME
       pam_nologin  -  Disables	 login	for  all except root when /etc/nologin
       exists

SYNOPSIS
       /lib/security/pam_nologin

DESCRIPTION
       pam_nologin is a PAM module that prevents users from logging  into  the
       system when /etc/nologin exists.	 The contents of the /etc/nologin file
       are displayed to the user.  The pam_nologin module has no effect on the
       root user's ability to log in.

OPTIONS
       pam_login has no options.

MODULE SERVICES PROVIDED
       auth   _authentication and _setcred (blank)

RETURN CODES
       pam_nologin has the following return codes:

       PAM_SUCCESS
	      Success:	either	the user is root or the /etc/nologin file does
	      not exist.

       PAM_SERVICE_ERR
	      The module was unable to get the user name.

       PAM_USER_UNKNOWN
	      The module cannot get the UID associated with this user.

       PAM_AUTH_ERR
	      The user is not root and /etc/nologin exists, so the user is not
	      permitted to log in.

HISTORY
       pam_nologin was written by Michael K. Johnson.

SEE ALSO
       pam.conf(8), pam.d(8), pam(8), nologin(8).

AUTHOR
       Emily Ratliff.

Linux 2.4			  2003-03-21			PAM_NOLOGIN(8)
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