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Re: [DNSOP] draft-ietf-dnsop-kskroll-sentinel-10 and AD

Mark Andrews <marka@isc.org> Wed, 04 April 2018 05:04 UTC

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From: Mark Andrews <marka@isc.org>
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Date: Wed, 04 Apr 2018 15:04:12 +1000
Cc: Paul Hoffman <paul.hoffman@vpnc.org>, dnsop <dnsop@ietf.org>
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To: Geoff Huston <gih@apnic.net>
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Subject: Re: [DNSOP] draft-ietf-dnsop-kskroll-sentinel-10 and AD
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> On 4 Apr 2018, at 2:30 pm, Geoff Huston <gih@apnic.net> wrote:
> 
> 
> 
>> 
>> No.  Below is self contradictory. Condition 1 requires that
>> CD=1 be turned into CD=0 and condition 3 requires that no special
>> processing happens for CD=1.
>> 
>> How CD is handled determines what you are testing when you have
>> resolvers in series.
>> 
>> Do you want CD=1 to disable special processing?
> 
> yes
> 
>> Do you want to only test the first validator?
> 
> yes
> 
>> Do you want to test the entire chain?
> 
> no
> 
>> Do you want consistency?
> 
> err, umm - yes? (is this a trick question? :-) )
> 
>> 
>> All the scenarios need to be worked through remembering that there
>> is a cache that may be populated.
>> 
> 
> 
> Mark, would it help if the phrase “regardless of whether DNSSSEC validation was requested.” 
> was removed?
> 
> i.e.:
> 
> 
> All of the following conditions must be met to trigger special
> processing inside resolver code:
> 
> o  The DNS response is DNSSEC validated
> 
> o  The result of validation is “Secure”.
> 
> o  The Checking Disabled (CD) bit in the query is not set.
> 
> o  The QTYPE is either A or AAAA (Query Type value 1 or 28).
> 
> o  The OPCODE is QUERY.
> 
> o  The leftmost label of the original QNAME (the name sent in the
>    Question Section in the original query) is either "root-key-
>    sentinel-is-ta-<key-tag>" or "root-key-sentinel-not-ta-<key-tag>”.
> 
> 
> Geoff

I think that is the way to go.


-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

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