Re: [stir] Benjamin Kaduk's Discuss on draft-ietf-stir-enhance-rfc8226-03: (with DISCUSS and COMMENT)
Russ Housley <housley@vigilsec.com> Tue, 29 June 2021 13:52 UTC
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From: Russ Housley <housley@vigilsec.com>
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Date: Tue, 29 Jun 2021 09:52:00 -0400
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To: Ben Kaduk <kaduk@mit.edu>
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Subject: Re: [stir] Benjamin Kaduk's Discuss on draft-ietf-stir-enhance-rfc8226-03: (with DISCUSS and COMMENT)
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Ben: >> For now, just responding to the DISCUSS ... >> >>> ---------------------------------------------------------------------- >>> DISCUSS: >>> ---------------------------------------------------------------------- >>> >>> Let's discuss whether we should have content in this document discussing >>> the relationship between this new certificate extension and the >>> extension defined by RFC 8226. In paticular, whether it is >>> permitted/expected for both extensions to appear in the same >>> certificate, and whether any specific processing is required in that >>> case. (If no such processing is specified, we could end up with >>> interesting edge cases where a given PASSporT is handled differently >>> depending on which extension(s) are supported by the recipient.) >> >> I see no reason why both extensions would ever appear in the same certificate. > > There was an open question for me about backwards compatibility... > >> If there is a mustExclude, then the constraints cannot be expressed in the extension defined in RFC 8226, so I would only expect the on in this document to be present. > > ... specifically, if the desired constraints include both mustExclude and > one of the preexisting restrictions, does "something is better than > nothing" apply when the recipient might not implement the new extension, > prompting a desire to include both extensions so that the recipient will > apply those constraints it does know about? No. It is important that all of the constraints are met for the use cases where mustExclude come into play. > If there is a desire to provide this backwards compatibility, is it better > to duplicate the constraint in both extensions or rely on both extensions > being processed and only put mustExclude in the new extension? If the > latter, why do we bother allowing the mustInclude and permittedValues forms > in the new extension? Indeed, If that were the case, I think a different design would be preferable. >> If there is not a mustExclude, the the constraints can be expressed in either extension equally well, so I would expect only the extension defined in RFC 8226, with the presumption that it is implemented more widely. >> >> I can add this advice to the document if it resolves your concern. > > I think at least the last bit makes sense to mention in this document. I'm > still not entirely clear on the full picture, though. I'll craft some text to address this, and then I will turn to your other comments. Russ
- [stir] Benjamin Kaduk's Discuss on draft-ietf-sti… Benjamin Kaduk via Datatracker
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Benjamin Kaduk
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Benjamin Kaduk
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Peterson, Jon
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Chris Wendt
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Ben Campbell
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Benjamin Kaduk
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Benjamin Kaduk
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley
- Re: [stir] Benjamin Kaduk's Discuss on draft-ietf… Russ Housley