Binary package “xtradius” in ubuntu lucid
Free radius server implementation
XtRadius is a free radius server implementation. The main feature is that
it can handle user accounting and authentication information via external
fully configurable scripts.
The Radius server is based on Cistron Radius 1.6.6. You can write script to
make you own auth and/or accounting routines without having to patch the
Communication between XtRadius server and external scripts can be made
using command line parameters or via environment variables.