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Re: [DNSOP] Alias mode processing in auths for draft-ietf-dnsop-svcb-https-01

Brian Dickson <brian.peter.dickson@gmail.com> Tue, 11 August 2020 21:51 UTC

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References: <00cfd965-bf69-d1cb-2df3-1a9bb110d7e0@powerdns.com> <CAHbrMsAJ-cbcW3v4T34f8-gzgzgHSkoBO545_Y3N8D6rof7Nmw@mail.gmail.com> <CAH1iCipZ25XaES0C4MFt3+aOm=d1U5LKigJe5AwKUWG-+yETFw@mail.gmail.com> <alpine.DEB.2.20.2008102304160.21650@grey.csi.cam.ac.uk> <CAHbrMsCePLp=vaw3fgf611TfnFpeUaV3xkCT5BSH3yzu-XZ1rg@mail.gmail.com> <alpine.DEB.2.20.2008112129160.21650@grey.csi.cam.ac.uk> <CAHbrMsBPyrgbbjx0_-w2Ysky63edtw3kKEBu7DrgDCfP_-GBBw@mail.gmail.com>
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From: Brian Dickson <brian.peter.dickson@gmail.com>
Date: Tue, 11 Aug 2020 14:50:50 -0700
Message-ID: <CAH1iCioL1JrCHo2yuu-90dy4MpRfwUF9iaK-S=NdaXRtvyteXA@mail.gmail.com>
To: Ben Schwartz <bemasc@google.com>
Cc: Tony Finch <dot@dotat.at>, dnsop <dnsop@ietf.org>, Pieter Lexis <pieter.lexis@powerdns.com>
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Subject: Re: [DNSOP] Alias mode processing in auths for draft-ietf-dnsop-svcb-https-01
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On Tue, Aug 11, 2020 at 2:38 PM Ben Schwartz <bemasc@google.com> wrote:

>
>
> On Tue, Aug 11, 2020 at 4:54 PM Tony Finch <dot@dotat.at> wrote:
>
>> Ben Schwartz <bemasc@google.com> wrote:
>> >
>> > 1. If TargetName is not in-bailiwick and is not ".", terminate the
>> procedure.
>> > 2. If SvcPriority is 0:
>> >     * If TargetName is ".", terminate the procedure.
>> >     * Otherwise, perform a SVCB "follow-up" query for TargetName and
>> add all
>> >       returned records, including any records added by this procedure.
>> >       If any SVCB records were added, terminate.
>> > 3. Perform A and AAAA follow-up queries for TargetName (or for the
>> owner name if
>> >    TargetName is "."), and add all returned records.
>>
>> I think the actual wording you want here is "in the same zone" not "in
>> bailiwick".
>>
> ...
>
> Thanks, I will make that correction.
>

I think the condition might be, "both in bailiwick and in the same zone"
meaning "in bailiwick and not below a zone cut"?

It may be overly explicit to say "not below a zone cut (delegation point)",
but "in the same zone" can be erroneously interpreted by implementers who
fail to recognize the pitfalls of zone cuts.

I might be overthinking it, though.

Brian

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