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How BSD Authentication Works

History The way OpenBSD authenticates users is quite different from other Unix-like operating systems. Most other systems like AIX, Solaris, Linux, the other BSDs, and MacOS, use a framework called Pluggable Authentication Module (PAM). The two main implementations are Linux PAM and OpenPAM. PAM modules are created as dynamically loaded shared objects, which communicate using a combination of common and implementation specific interfaces (Linux-PAM and OpenPAM). It's configured using the pam.