Name
pam_nologin - Prevent non-root users from loginSynopsis
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\*(Aqs 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 account 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(7)
Author
pam_nologin was written by Michael K. Johnson <[email protected]>.