What is pam authentication in Linux
PAM AUTHENTICATION
When an applications needs to authenticate a user, it calls the appropriate PAM library function. The application also provides this function with a “conversation function”, so it may provide any necessary prompts to the user for passwords or other information. The PAM library looks at its configuration files and determines which modules need to be executed. Each module implements an authentication check of some sort, which may or may not include normal UNIX authentication through C library calls
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