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PAM_LOCALUSER(8) Linux-PAM Manual PAM_LOCALUSER(8)
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.
debug Print debug information. file=/path/passwd Use a file other than /etc/passwd.
All module types (account, auth, password and session) are provided.
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
/etc/passwd Local user account information.
pam.conf(5), pam.d(5), pam(8)
pam_localuser was written by Nalin Dahyabhai <[email protected]>.
This page is part of the linux-pam (Pluggable Authentication
Modules for Linux) project. Information about the project can be
found at ⟨http://www.linux-pam.org/⟩. If you have a bug report
for this manual page, see ⟨//www.linux-pam.org/⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/linux-pam/linux-pam.git⟩ on 2023-12-22. (At
that time, the date of the most recent commit that was found in
the repository was 2023-12-18.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
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Linux-PAM Manual 12/22/2023 PAM_LOCALUSER(8)