Edit: /usr/share/doc/pam/txts/README.pam_nologin (1348B)
pam_nologin — Prevent non-root users from login
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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.
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.
AUTHOR
pam_nologin was written by Michael K. Johnson
.