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

Ben Schwartz <bemasc@google.com> Tue, 11 August 2020 21:53 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> <CAH1iCioL1JrCHo2yuu-90dy4MpRfwUF9iaK-S=NdaXRtvyteXA@mail.gmail.com>
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From: Ben Schwartz <bemasc@google.com>
Date: Tue, 11 Aug 2020 17:53:40 -0400
Message-ID: <CAHbrMsD8e0mXER0-R7YmjR6GR6kP4rwdoL3uJcB83GPt+XgHcA@mail.gmail.com>
To: Brian Dickson <brian.peter.dickson@gmail.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, 5:51 PM Brian Dickson <brian.peter.dickson@gmail.com>
wrote:

>
>
> 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 seems to me that returning a (downward) delegation could actually be
useful.  So why not include that?


> 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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