NGNIX reverse Proxy with Kerberos auth

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Hi,

is it possible to make with NGINX a reverse proxy with kerberos auth?
NGINX should do all the authentication stuff, so the user don´t talk
directly with the kerberos server.

The goal is:
- the user connect to webmail.example.com
- a authentication Windows pops up
- the user types the login information (user and password, no domain)
- NGNIX do all the auth stuff
- the user directly login to webmail without second authentication.

Kerberos and webmail are Windows servers.
At the moment we do this with Windows TMG but for future we want a other
proxy.

thanks

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,284012,284012#msg-284012