PAM Library
The PAM library, libpam(3LIB), is the central element in the PAM architecture:
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libpam exports an API, pam(3PAM). Applications can call this API for authentication, account management, credential establishment, session management, and password changes.
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libpam imports a master configuration file pam.conf(4). The PAM configuration file specifies the PAM module requirements for each available service. pam.conf is managed by a system administrator.
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libpam imports an SPI, pam_sm(3PAM), which is exported by the service modules.
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