Hi,
Is this in any way doable with FreeRADIUS?
Yes. Arran was doing this a while ago, which is how he ran into the above problem.
It is doable with FreeRADIUS, but FreeRADIUS wasn't doing when I was playing around with it.
The NAS was translating Reply-Message into an EAP-Notification and sending it *after* the EAP-Success or EAP-Failure.
This was causing wpa_supplicant to reinitialize it's state machine, and restart authentication, which is how I became aware of it.
This is not what I mean... converting Reply-Message is forbidden for a good reason (as you quote below): the authenticator can't be a pass-through any more if he actively "fiddles" with the EAP conversation on its own. That's why the RFC language is so strong about the MUST about EAP-Notification and MUST NOT of Reply-Message in presence of the EAP-Message attribute.
Yes you can send an EAP-Notification, but you should probably test whether any supplicants will actually display it before investigating this much further.
Back when I looked at it in 2008, only the OSX supplicant did anything useful with it, and even then it was just writing it out to one of the system log files.
You can fake a Challenge with unlang pretty easily for testing and just send it instead of the original EAP-Failure message.
Use regex over %{hex:EAP-Message} to extract required ID field value.
and to set the response type: update response { Response-Packet-Type := Access-Challenge }
You may have to set the Response-Packet-Type immediately after calling EAP, I don't know if setting it in Post-Auth REJECT will work, and you'll also need FreeRADIUS 3.0.1 or higher.
Well, that's better than nothing certainly. Guess what: I'm asking this question because we are currently setting up what we call an "EAP Lab" (working title) where a (Free- and others) RADIUS server can be tuned to behave "non-normal" so that we can test supplicant behaviour in such unusual situations. We were primarily aiming at "what if the server cert's issuing CA suddently changes" and the like, but EAP-Notification is great test vector to include. We'll put your recipe above to the test on that lab and will ask back if in doubt (certainly :-) ) ... The EAP lab website is WIP, but you can always already go here: http://supplicants.net and click around. Greetings, Stefan Winter -- Stefan WINTER Ingenieur de Recherche Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche 6, rue Richard Coudenhove-Kalergi L-1359 Luxembourg Tel: +352 424409 1 Fax: +352 422473 PGP key updated to 4096 Bit RSA - I will encrypt all mails if the recipient's key is known to me http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xC0DE6A358A39DC66