https authorisation server?

[Jeremy Ardley <jeremy@ardley.org>]

I'm working on providing an imap proxy on my LAN gateway and it seems 
nginx module ngx_mail will do the job nicely.

The problem is the module mandates an http authorisation server.

Ideally I would run the authorisation server on my internal mail machine 
and it would use PAM or suchlike to look up mail usernames and passwords 
rather than me having to maintain separate user/password files.

What candidates are there for a standalone https authorisation server? 
Or a plug in module for an nginx instance running on the internal mail 
server?

Thanks,

--
Jeremy

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