Cisco VPN :: 3000 SSL Port Forwarding With ASA?

I'd need to protect access to a very critical web site on my LAN.To achieve this I have been thinking to use a cisco ASA, because Cisco VPN3000 appliances are out of market now.  But i do not know if I can achieve what I'd wish to do.I need (upon authentication) that an user connection to port 443 is forwarded to port 443 (or another TCP port)to my internal LAN where is the critical web site.So basically I need a feature like the WebVPN functionality of the Cisco VPN 3000 serires where you can logon.using web interface and you are forwarded to specific TCP port or you jsut type the web site where you want to go after authentication. For maximum compatibility (because users can be anywhere in the world and IPSEC or PPTP can be filtered) I'd need to do this with an SSL port forwarding.Is it possible to do this with the SSL VPN configuration options of the Cisco ASA ? Is it possible then to authorize users using LDAP group matching and authenticate users using kerberos 5 ?