pam_nologin - Prevent non-root users from login
2. SYNOPSIS ▲
pam_nologin.so [file=/path/nologin] [successok]
3. 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.
4. OPTIONS ▲
Use this file instead the default /etc/nologin.
Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE.
5. MODULE TYPES PROVIDED ▲
The auth and acct module types are provided.
6. RETURN VALUES ▲
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 /etc/nologin file does not exist.
User not known to the underlying authentication module.
7. EXAMPLES ▲
The suggested usage for /etc/pam.d/login is:
auth required pam_nologin.so
8. 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.
9. SEE ALSO ▲
nologin(5), pam.conf(5), pam.d(5), pam(7)
10. AUTHOR ▲
pam_nologin was written by Michael K. Johnson <>.