22.7 About Pluggable Authentication Modules

The Pluggable Authentication Modules (PAM) feature is an authentication mechanism that allows you to configure how applications use authentication to verify the identity of a user. The PAM configuration files, which are located in the /etc/pam.d directory, describe the authentication procedure for an application. The name of each configuration file is the same as, or is similar to, the name of the application for which the module provides authentication. For example, the configuration files for passwd and sudo are named passwd and sudo.