PAM_LOCALUSER(8)               Linux-PAM Manual               PAM_LOCALUSER(8)

NAME
       pam_localuser - require users to be listed in /etc/passwd

SYNOPSIS
       pam_localuser.so [debug] [file=/path/passwd]

DESCRIPTION
       pam_localuser is a PAM module to help implementing site-wide login
       policies, where they typically include a subset of the network's users
       and a few accounts that are local to a particular workstation. Using
       pam_localuser and pam_wheel or pam_listfile is an effective way to
       restrict access to either local users and/or a subset of the network's
       users.

       This could also be implemented using pam_listfile.so and a very short
       awk script invoked by cron, but it's common enough to have been
       separated out.

OPTIONS
       debug
           Print debug information.

       file=/path/passwd
           Use a file other than /etc/passwd.

MODULE TYPES PROVIDED
       All module types (account, auth, password and session) are provided.

RETURN VALUES
       PAM_SUCCESS
           The new localuser was set successfully.

       PAM_BUF_ERR
           Memory buffer error.

       PAM_CONV_ERR
           The conversation method supplied by the application failed to
           obtain the username.

       PAM_INCOMPLETE
           The conversation method supplied by the application returned
           PAM_CONV_AGAIN.

       PAM_SERVICE_ERR
           The user name is not valid or the passwd file is unavailable.

       PAM_PERM_DENIED
           The user is not listed in the passwd file.

EXAMPLES
       Add the following lines to /etc/pam.d/su to allow only local users or
       group wheel to use su.

           account sufficient pam_localuser.so
           account required pam_wheel.so

FILES
       /etc/passwd
           Local user account information.

SEE ALSO
       pam.conf(5), pam.d(5), pam(7)

AUTHOR
       pam_localuser was written by Nalin Dahyabhai <nalin@redhat.com>.

Linux-PAM Manual                  09/03/2021                  PAM_LOCALUSER(8)

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