Pulling the covers off Linux PAM
A hidden jewel -- or pain in the rear, depending on your perspective -- is Linux PAM (Pluggable Authentication Module). Linux oldtimers remember the ancient days when PAM was simple and used but a single configuration file. It didn't do much, and life was easy. The modern PAM is more complex and flexible, which can be trying for new sysadmins. But it has a number of significant advantages.
By Carla Schroder at ENP.
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