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nologin(5) [linux man page]

NOLOGIN(5)						     Linux Programmer's Manual							NOLOGIN(5)

NAME
nologin - prevent unprivileged users from logging into the system DESCRIPTION
If the file /etc/nologin exists, login(1) will allow access only to root. Other users will be shown the contents of this file and their logins will be refused. FILES
/etc/nologin SEE ALSO
login(1), shutdown(8) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 1992-12-29 NOLOGIN(5)

Check Out this Related Man Page

PAM_NOLOGIN(8)							 Linux-PAM Manual						    PAM_NOLOGIN(8)

NAME
pam_nologin - Prevent non-root users from login SYNOPSIS
pam_nologin.so [file=/path/nologin] [successok] DESCRIPTION
pam_nologin is a PAM module that prevents users from logging into the system when /var/run/nologin or /etc/nologin exists. The contents of the file are displayed to the user. The pam_nologin module has no effect on the root user's ability to log in. OPTIONS
file=/path/nologin Use this file instead the default /var/run/nologin or /etc/nologin. successok Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE. MODULE TYPES PROVIDED
The auth and acct module types are provided. RETURN VALUES
PAM_AUTH_ERR The user is not root and /etc/nologin exists, so the user is not permitted to log in. PAM_BUF_ERR Memory buffer error. PAM_IGNORE This is the default return value. PAM_SUCCESS Success: either the user is root or the nologin file does not exist. PAM_USER_UNKNOWN User not known to the underlying authentication module. EXAMPLES
The suggested usage for /etc/pam.d/login is: auth required pam_nologin.so NOTES
In order to make this module effective, all login methods should be secured by it. It should be used as a required method listed before any sufficient methods in order to get standard Unix nologin semantics. Note, the use of successok module argument causes the module to return PAM_SUCCESS and as such would break such a configuration - failing sufficient modules would lead to a successful login because the nologin module succeeded. SEE ALSO
nologin(5), pam.conf(5), pam.d(5), pam(8) AUTHOR
pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>. Linux-PAM Manual 09/19/2013 PAM_NOLOGIN(8)

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