6.18. pam_localuser - require users to be listed in /etc/passwd
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## 6.18. pam_localuser - require users to be listed in /etc/passwd

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

### 6.18.1. 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.

### 6.18.2. OPTIONS

debug

  Print debug information.

file=/path/passwd

  Use a file other than `/etc/passwd`.

### 6.18.3. MODULE TYPES PROVIDED

All module types (`account`, `auth`, `password` and `session`) are provided.

### 6.18.4. 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.

### 6.18.5. 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

### 6.18.6. AUTHOR

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

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