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Re: [Emu] TEAP Request-Action TLV

Eliot Lear <lear@cisco.com> Thu, 30 April 2020 19:03 UTC

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From: Eliot Lear <lear@cisco.com>
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Date: Thu, 30 Apr 2020 21:03:01 +0200
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Cc: Eliot Lear <lear=40cisco.com@dmarc.ietf.org>, EMU WG <emu@ietf.org>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Emu] TEAP Request-Action TLV
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> On 30 Apr 2020, at 20:53, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> Signed PGP part
> 
> Eliot Lear <lear=40cisco.com@dmarc.ietf.org> wrote:
>> Here is a circumstance one could easily imagine, and in fact we
>> attempted to address in draft-lear-eap-teap-brski:
> 
>> Client requires a new certificate for some reason or another.  Perhaps
>> its is about to expire, or perhaps the signer has been compromised, or
>> what have you.
> 
> I think that's a really bad example.  I can talk about the reasons, but I
> think it would detract from your query.

Certificate do need to roll, and we should handle that case.  One could use the ACME/LE model of just periodically sending a PKCS#10 request after 2/3rds of the expiry is past, but that doesn’t help us in the case where the signing cert needs to roll.

> Maybe you can give me a different use case?

A different use case might be (later on), “please send me a RATS attestation”.  The key point is that the EAP server is a good control channel to gate clients in a lock step fashion, but the Request-Action TLV doesn’t quite get us there, as written, as I see it.

Eliot

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