pam_nologin - Prevent non-root users from login
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.
Use this file instead the default /var/run/nologin or
Return PAM_SUCCESS if no file exists, the default is
The auth and account module types are provided.
The user is not root and /etc/nologin exists, so the user
is not permitted to log in.
Memory buffer error.
This is the default return value.
Success: either the user is root or the nologin file does
User not known to the underlying authentication
The suggested usage for /etc/pam.d/login is:
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
pam_nologin was written by Michael K. Johnson <email@example.com>.
auth required pam_nologin.so