Programs which allow users access to a system verify the user's identity through a process called authentication called Pluggable Authentication Modules (PAM).
PAM uses a pluggable, modular architecture, which affords the system administrator a great deal of flexibility in setting authentication policies for the system.
misconfiguration of PAM can compromise system security, it is important to understand the structure of these files before making any modifications (refer to Section 14.3 PAM Configuration File Format for more information).
PAM offers the following advantages:
Provides a common authentication scheme that can be used with a wide variety of applications.
Allows a large amount of flexibility and control over authentication for both the system administrator and application developer.
Allows application developers to develop programs without creating their own authentication scheme.
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