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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>.
04/01/2016 Linux-PAM Manual