Draft draft-dekok-emu-eap-arpa-01 has the following text:

https://www.ietf.org/archive/id/draft-dekok-emu-eap-arpa-01.html#section-4-3
  TBD: The Wireless Broadband Alliance (WBA) has defined an unauthenticated
  EAP-TLS method, using a vendor-specific EAP type. Get link.

This appears to be part of Hotspot 2.0r2 and wpa_supplicant implements it.
For example:
https://w1.fi/cgit/hostap/tree/src/eap_common/eap_defs.h#n112
https://w1.fi/cgit/hostap/tree/src/eap_server/eap_server_tls.c#n479

Wikipedia has more info about its history and pointers to the first commits
from 10+ years ago:
https://en.wikipedia.org/wiki/Extensible_Authentication_Protocol#EAP-TLS

I haven't seen any use of "WFA-UNAUTH-TLS", though.

-- 
Heikki Vatiainen
h...@radiatorsoftware.com
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