Well I found something that appears to work. I used the hints file. And it correctly stripped off the host/ and domain.local.

However now I get the error

[eap] Identity does not match User-Name, setting from EAP Identity
[eap] Failed in handler




On Fri, Mar 15, 2013 at 3:29 PM, Matthew Ceroni <matthewceroni@gmail.com> wrote:
When doing 802.1x authentication from a Windows computer it initially sends the request with the computer credentials. The username comes across as host/E4310-D7SZZN1.domain.local. I then query LDAP in authorize and do authentication against AD. 

In order to do both steps the username needs to be stripped to just E4310-D7SZZN1. I was able to accomplish this by placing the following in the authorize section

        if ("%{request:User-Name}" =~ /^host\/(.*).domain.local$/) {
                update request {
                        Stripped-User-Name = "%{1}$"
                }
        }

This worked just for the authentication section as it appears this happens after the LDAP module is called in authorize. 

How can I get this to happen earlier in the process? Right now I am looking at the proxy.conf file and setting a realm? Would this be the area to have this done?