Everything You Need to Know About Pluggable Authentication Module

Pluggable Authentication Module (PAM) is a framework that lets system applications use configurable authentication services without requiring changes to the applications themselves. It supports methods such as passwords, biometrics, tokens, and multi-factor authentication through ordered stacks of modules that evaluate user credentials and determine whether access is granted. PAM separates functions into authentication, account, session, and password-management modules, allowing administrators to enforce policies for credentials, account access, environment settings, session limits, and password quality. Commonly configured through service-specific files in `/etc/pam.d/`, PAM is widely used by Linux login services, web applications, and corporate systems to centralize access control and adapt security practices to evolving authentication technologies.

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