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Re: [Ace] draft-ietf-ace-oauth-authz

Carsten Bormann <cabo@tzi.org> Wed, 06 May 2020 04:09 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Wed, 06 May 2020 06:09:04 +0200
Cc: Benjamin Kaduk <kaduk@mit.edu>, Olaf Bergmann <bergmann@tzi.org>, Peter van der Stok <stokcons@bbhmail.nl>, peter van der Stok <consultancy@vanderstok.org>, Ace <ace@ietf.org>
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To: Jim Schaad <ietf@augustcellars.com>
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Subject: Re: [Ace] draft-ietf-ace-oauth-authz
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On 2020-05-05, at 17:39, Jim Schaad <ietf@augustcellars.com> wrote:
> 
> I don't see how the four-corner model solves the issue that I highlighted.  If the client does not have a key for any local AS, then nothing helps.  The four-corner model deals with the issue of the client and the RS not trusting the same AS, but the different AS entities trust each other on the back side.
> 
> Getting trust in a local AS seems to be a bootstrapping problem.

If you only have one security domain, there is no benefit.
But in general is it much easier to bootstrap a device once into its own security domain, instead of having to do the bootstrapping again and again for each server that device needs to access.

Grüße, Carsten


> 
> Jim
> 
> 
> -----Original Message-----
> From: Carsten Bormann <cabo@tzi.org> 
> Sent: Monday, May 4, 2020 10:38 PM
> To: Jim Schaad <ietf@augustcellars.com>
> Cc: Benjamin Kaduk <kaduk@mit.edu>; Olaf Bergmann <bergmann@tzi.org>; Peter van der Stok <stokcons@bbhmail.nl>; peter van der Stok <consultancy@vanderstok.org>; Ace <ace@ietf.org>
> Subject: Re: [Ace] draft-ietf-ace-oauth-authz
> 
> On 2020-05-05, at 06:54, Jim Schaad <ietf@augustcellars.com> wrote:
>> 
>> I have much the same problem.  While a client could find an AS which 
>> would authenticate the client, I don't know how the client would 
>> establish any degree of trust in the AS which is going to give it tokens.
> 
> Hence the four-corner model [1].
> 
> Grüße, Carsten
> 
> [1]: https://tools.ietf.org/html/draft-ietf-ace-actors
>

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