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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 \FC/etc/nologin\F[] exists. The contents of the \FC/etc/nologin\F[] 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 \FC/etc/nologin\F[].

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 \FC/etc/nologin\F[] 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 \FC/etc/nologin\F[] file does not exist.

PAM_USER_UNKNOWN

User not known to the underlying authentication module.

EXAMPLES


The suggested usage for \FC/etc/pam.d/login\F[] is:

auth required pam_nologin.so

\M[lightgray]\D’P 75u 0 0 0u -75u 0 0 -0u’\M[] \M[lightgray]\D’P 75u 0 0 0u -75u 0 0 -0u’\M[]

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>.

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