6.17. pam_localuser - require users to be listed in /etc/passwd
pam_localuser.so [ debug ] [ file=/path/passwd ]
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.
- 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.
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