Re: [DNSOP] draft-fujiwara-dnsop-delegation-information-signer

Mark Andrews <marka@isc.org> Thu, 05 November 2020 22:10 UTC

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From: Mark Andrews <marka@isc.org>
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Date: Fri, 6 Nov 2020 09:10:41 +1100
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Subject: Re: [DNSOP] draft-fujiwara-dnsop-delegation-information-signer
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DNS is loosely coherent. DiS does not work when the sources of data are not coherent. 

-- 
Mark Andrews

> On 5 Nov 2020, at 19:26, fujiwara@jprs.co.jp wrote:
> 
> 
>> 
>> From: Mark Andrews <marka@isc.org>
>>>> One problem with DiS is that assumes that address records in the additional
>>>> section *always* come from the delegating zone (see how the hash is created).
>>>> This is not how DNS works.  Address records can, correctly, come from other
>>>> sources, even when the name is *below* the zone cut.
>>>> 
>>>> Take a server that serves example.net and sub.child.example.net.  That A record
>>>> comes from sub.child.example.net not example.net when the name of the server is
>>>> a.sub.example.net.
>>>> 
>>>>    child.example.net NS a.sub.example.net
>>>>    a.sub.example.net A 1.2.3.4
>> I ment
>>    child.example.net NS a.sub.child.example.net
>>    a.sub.child.example.net A 1.2.3.4
>> 
>> (which should have been obvious from the paragraph above)
> 
> Do you mean these 2 lines in example.net zone ?
>>    child.example.net NS a.sub.child.example.net
>>    a.sub.child.example.net A 1.2.3.4
> 
> Then, we can generate DiS RR.
>  hash ( child.example.net NS | a.sub.child.example.net A).
> 
> DNSSEC validators can get both "child.example.net NS a.sub.child.example.net"
> and glue "a.sub.child.example.net A 1.2.3.4",
> and validate child.example.net DiS RR.
> 
> --
> Kazunori Fujiwara, JPRS <fujiwara@jprs.co.jp>
> 
>