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Re: [Anima] New Version of draft-eckert-anima-grasp-dnssd

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 25 July 2023 02:53 UTC

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Date: Tue, 25 Jul 2023 14:53:52 +1200
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To: "Fries, Steffen" <steffen.fries@siemens.com>, Michael Richardson <mcr+ietf@sandelman.ca>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [Anima] New Version of draft-eckert-anima-grasp-dnssd
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On 24-Jul-23 18:26, Fries, Steffen wrote:
> Hi Brian,
> 
> There is ongoing work in the ANIMA design team about the extension of the discovery information for a registrar, to contain more information about specific features of the registrar. We currently identified:
> - the operational mode: registrar as responder (as in RFC 8995) or pledge as responder (as in BRSKI-PRM)
> - the enrollment protocol: EST as in RFC 8995) or CMP (as in BRSIK-AE) or future adaptations
> - the voucher format: CMS-signed JSON (as in RFC 8995) or JOSE-signed JSON (as in JWS-Voucher used in BRSKI-PRM
> 
> The discussion is to define TXT key value pairs for DNS-SD, and use this approach also for GRASP.

Yes, but you can map them in CBOR just as draft-eckert-anima-grasp-dnssd already describes. (Think JSON but code CBOR.) My only real concern is how to extend the objective for the AN_join_registrar. It seems lame to use plain text when a JSON-style map would be much nicer for the programmer. My prototype code for grasp-dnssd has to parse DNS records to change them into Python maps. But once that's done, sending or receiving them as CBOR is trivial.

> 
> Best regards
> Steffen
> 
>> -----Original Message-----
>> From: Michael Richardson <mcr+ietf@sandelman.ca>
>> Sent: Monday, July 17, 2023 11:47 PM
>> To: Brian E Carpenter <brian.e.carpenter@gmail.com>
>> Cc: Fries, Steffen (T CST) <steffen.fries@siemens.com>; anima@ietf.org
>> Subject: Re: [Anima] New Version of draft-eckert-anima-grasp-dnssd
>>
>>
>> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>>      > I can't answer that, but note that the AN_Proxy and AN_join_registrar
>>      > GRASP objectives defined in RFC 8995 include an objective-value field.
>>      > For AN_Proxy that field is "any" so is currently undefined and could be
>>      > extended in any way we want. For AN_join_registrar it is defined as
>>
>> In hindsight, 8995 should have created an IANA registry for these.
>>
>>      > I find that "(list of)" a bit unclear but again there is flexibility to
>>      > extend the semantics as we want. In fact that "(list of)" is almost
>>      > worth an errata, since I wouldn't know what to write in a program to
>>      > implement it.
>>
>> :-)
>>
>> --
>> Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
>>             Sandelman Software Works Inc, Ottawa and Worldwide
>>
>>
>>
>

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