Let me ask our RADIUS folks about this tomorrow. I'll post whatever I find out.


==========================
-jcw
________________________________
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Scot Colburn 
[colb...@ucar.edu]
Sent: Wednesday, February 01, 2017 5:55 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Windows 10 eduroam EAP/TLS adding "host/" before 
username in RADIUS request?

Is anybody else seeing Windows 10 prepending "host/" to eduroam usernames in 
EAP/TLS auth?

We've had trouble getting our Windows 10 machines authenticating onto our 
eduroam SSID using EAP/TLS. We seem to have two outcomes, neither of which work:
1) if we create a "Manual Profile" then no authentication traffic ever hits the 
RADIUS server.
2) if we do NOT create a manual profile then an authentication request does hit 
the RADIUS server, but with "host/" prepended to the hostname. Our RADIUS 
server rejects the authentication with "host/" prepended; I imagine a roaming 
user would have often have the same issue.

I have a theory: The eduroam auth requires a "realm" to be appended to the 
username so eduroam service-providers and federated RADIUS servers know to 
proxy a roaming RADIUS auth to the correct server. In our case, we append 
"@ucar.edu<http://ucar.edu>" to the username. Maybe that 
"@ucar.edu<http://ucar.edu/>"  is provoking Windows10 to prepend the "host/" 
prefix.  Authentication to our internal SSID without the 
"@ucar.edu<http://ucar.edu>" is working normally.

Any clues?

I think we can build a workaround to rewrite the username on the RADIUS server, 
but that won't help our roaming eduroam EAP/TLS users if other eduroam 
service-providers are having the same issue.

Scot Colburn
Network Engineer NCAR/UCAR/NETS/FRGP

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