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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]\DP 75u 0 0 0u -75u 0 0 -0u\M[]
\M[lightgray]\DP 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>.