What are Pluggable Authentication Modules (PAM) and how do they work?

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文章标签： PAM Pluggable Authentication Modules

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本文介绍Red Hat Enterprise Linux中使用的Pluggable Authentication Modules (PAM)，一种灵活且可扩展的认证机制，允许系统管理员为各种应用设定统一的认证策略。

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https://access.redhat.com/articles/8983

Updated 2012年九月16日10:04 -

English

Programs which grant users access to a system verify each user's identity through a process called authentication. Historically, each such program had its own way of performing the task of authentication. Under Red Hat Enterprise Linux, many such programs are configured to use a centralized authentication mechanism called Pluggable Authentication Modules or PAM.

PAM uses a pluggable, modular architecture, which affords the system administrator a great deal of flexibility in setting authentication policies for the system.

In most situations, the default PAM configuration file for a PAM-aware application is sufficient. However, sometimes it may become necessary to edit a PAM configuration file. Because misconfiguration of PAM can compromise system security, it is important to understand the structure of these files before making any modifications.

Advantages of PAM

PAM offers the following advantages:

It provides a common authentication scheme that can be used with a wide variety of applications.
It allows a large amount of flexibility and control over authentication for both system administrators and application developers.
It allows application developers to develop programs without creating their own authentication scheme.