libapache2-mod-auth-pam | module for Apache2 which authenticate using PAM | Mehr ...
mod_auth_pam implements authentication routines using PAM (Plugable Authentication Modules) for apache's authentication protocol. . This package provides the module for Apache 2.0 server.
libapache2-mod-auth-sys-group | Module for Apache2 which checks user against system group | Mehr ...
mod_auth_pam implements 'require group' functionality against system group database. . This package provides the module for Apache 2.0 server.