How to restrict access based on a text file in PAM?

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The Pluggable Authentication Modules (PAM) module used to restrict access based on a text file is called pam_listfile.so. This is used to check a specified item against a list in a file; items can be tty, user, group, shell, ruser, rhost. It can restrict the access to the entire system or a specific (PAM aware) service.

Example: Restrict sshd a...

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