PAM Module Paths

Module paths tell PAM where to find the pluggable module to be used with the module type specified. Usually, it is provided as the full path to the module, such as /lib/security/pam_stack.so. However, if the full path is not given (in other words, the path does not start with a /), then the module indicated is assumed to be in the /lib/security/ directory — the default location for PAM modules.