The roadwarrior carol sets up a connection to gateway moon.
The authentication is based on RSA signatures (RSASIG) using X.509 certificates
followed by extended authentication (XAUTH) of carol based on a user name
equal to the IKEv1 identity (carol@strongswan.org) and a user password
defined and stored by carol in ipsec.secrets. Gateway moon verifies
carol's XAUTH user credentials using a RADIUS connection with AAA server
alice.