Grp is a extremely simple radsec proxy written in Golang: it only supports
forwarding packets incoming from the TLS 1.2 connection to a radius UDP backend.
It is well suited for deployment on containers as it keeps itself in the
foreground, logs to stdout and is configured only through environment
variables:
GRP_PORT: port to listen. Default: 2083.
GRP_CA_FILE: CA certificate file. Default: ca.crt.
GRP_CERT_FILE: server certificate file. Default: server.crt.