Re: [Ace] Embedded Content Types
Jim Schaad <ietf@augustcellars.com> Thu, 21 February 2019 21:54 UTC
Return-Path: <ietf@augustcellars.com>
X-Original-To: ace@ietfa.amsl.com
Delivered-To: ace@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9E8A3131258; Thu, 21 Feb 2019 13:54:25 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fz_NfbLWXDvx; Thu, 21 Feb 2019 13:54:23 -0800 (PST)
Received: from mail2.augustcellars.com (augustcellars.com [50.45.239.150]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0545213128C; Thu, 21 Feb 2019 13:54:22 -0800 (PST)
Received: from Jude (73.180.8.170) by mail2.augustcellars.com (192.168.0.56) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 21 Feb 2019 13:54:15 -0800
From: Jim Schaad <ietf@augustcellars.com>
To: "'Panos Kampanakis (pkampana)'" <pkampana@cisco.com>, 'Carsten Bormann' <cabo@tzi.org>
CC: ace@ietf.org, 'Klaus Hartke' <hartke@projectcool.de>, draft-ietf-ace-coap-est@ietf.org
References: <02a201d4c945$eb10a510$c131ef30$@augustcellars.com> <17e617f1090e451c8b17f6550c2e213a@XCH-ALN-010.cisco.com> <CCD28BCC-16AA-492B-8E14-DAE9F2CF2E3C@tzi.org> <38fa1ec646974a329c286279b3fa9ff0@XCH-ALN-010.cisco.com>
In-Reply-To: <38fa1ec646974a329c286279b3fa9ff0@XCH-ALN-010.cisco.com>
Date: Thu, 21 Feb 2019 13:54:15 -0800
Message-ID: <032f01d4ca2f$ff19c6a0$fd4d53e0$@augustcellars.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
X-Mailer: Microsoft Outlook 16.0
Thread-Index: AQJrZGJxf0tFnICB97QT3wBXQb1jnQH8O2UCAceAOO4BnmC3sKSShd4w
Content-Language: en-us
X-Originating-IP: [73.180.8.170]
Archived-At: <https://mailarchive.ietf.org/arch/msg/ace/ffE5efcOTSrqvImEJvy5tVum3s8>
Subject: Re: [Ace] Embedded Content Types
X-BeenThere: ace@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Authentication and Authorization for Constrained Environments \(ace\)" <ace.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ace>, <mailto:ace-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ace/>
List-Post: <mailto:ace@ietf.org>
List-Help: <mailto:ace-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ace>, <mailto:ace-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 21 Feb 2019 21:54:33 -0000
> -----Original Message----- > From: Panos Kampanakis (pkampana) <pkampana@cisco.com> > Sent: Thursday, February 21, 2019 1:32 PM > To: Carsten Bormann <cabo@tzi.org> > Cc: Jim Schaad <ietf@augustcellars.com>; ace@ietf.org; Klaus Hartke > <hartke@projectcool.de>; draft-ietf-ace-coap-est@ietf.org > Subject: RE: [Ace] Embedded Content Types > > Thanks Carsten. > > Let's say we use a query /skg?sk=xxx&spk=yyy. /skg/xxx,yyy is a different > URI imo, so it changes the EST spec and that introduces changes that affect > CAs that already implemented it. So let's say we do /skg?sk=xxx&spk=yyy. > When I am doing resource discovery and the server is returning the content > formats for skg, is he going to signal his supported formats with > </est/skg>;rt="ace.est.skg";ct="62 xxx yyy" This is why I would prefer doing something like "/est/skg" and "/est/skg/yyy". This does not change any existing servers other than getting the ct values corrected in discovery. > > RFC5272 says > > The Content-Format code "ct" attribute provides a hint about the > > Content-Formats this resource returns. Note that this is only a hint, > > and it does not override the Content-Format Option of a CoAP response > > obtained by actually requesting the representation of the resource. > > [...] The Content-Format code attribute MAY include a space-separated > > sequence of Content-Format codes, indicating that multiple > > content-formats are available. > > So it looks tome that ct="62 280 284 281 TBD287" could hint to the client that > all the following formats are supported for the multipart. > > I had a chat with Klaus where he mentioned that he assumed the ct="63 xxx > yyy" returned attribute values are the accepted values by the server in the > "Accept" option. I would agree with Klaus that this is a correct answer. Jim > > > -----Original Message----- > From: Carsten Bormann <cabo@tzi.org> > Sent: Wednesday, February 20, 2019 8:11 PM > To: Panos Kampanakis (pkampana) <pkampana@cisco.com> > Cc: Jim Schaad <ietf@augustcellars.com>; ace@ietf.org; Klaus Hartke > <hartke@projectcool.de>; draft-ietf-ace-coap-est@ietf.org > Subject: Re: [Ace] Embedded Content Types > > On Feb 20, 2019, at 22:33, Panos Kampanakis (pkampana) > <pkampana@cisco.com> wrote: > > > > If we broke the requests to different URIs, it means that a client needs to > keep track of his transactions and on top of it he needs to correlate the key > and the cert he receives at a later time. > > I think this is just a misunderstanding — the idea wasn’t to supply the parts > under different URIs, but to make up different URIs for retrieving the > different combinations coming in one multipart-core, in one transaction. > > As in > > /skg?sk=284&spk=281 > > (Where sk is short for “secret key” and spk for “signed public key” — > substitute your own names.) > > or, say > > /skg/284,281 > > This provides full format agility while preserving the interaction model. > > Grüße, Carsten
- [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Panos Kampanakis (pkampana)
- Re: [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Carsten Bormann
- Re: [Ace] Embedded Content Types Peter van der Stok
- Re: [Ace] Embedded Content Types Michael Richardson
- Re: [Ace] Embedded Content Types Panos Kampanakis (pkampana)
- Re: [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Panos Kampanakis (pkampana)
- Re: [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Carsten Bormann
- Re: [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Panos Kampanakis (pkampana)
- Re: [Ace] Embedded Content Types Jim Schaad
- Re: [Ace] Embedded Content Types Panos Kampanakis (pkampana)
- Re: [Ace] Embedded Content Types Michael Richardson
- Re: [Ace] Embedded Content Types Jim Schaad