Re: [DNSOP] [Last-Call] Secdir last call review of draft-ietf-dnsop-extended-error-14

Petr Špaček <petr.spacek@nic.cz> Wed, 15 April 2020 06:22 UTC

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To: Wes Hardaker <wjhns1@hardakers.net>
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Date: Wed, 15 Apr 2020 08:22:41 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/MRK7dP9obEeteriY3uyUwIIPCGo>
Subject: Re: [DNSOP] [Last-Call] Secdir last call review of draft-ietf-dnsop-extended-error-14
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On 15. 04. 20 0:34, Wes Hardaker wrote:
> Catherine Meadows via Datatracker <noreply@ietf.org> writes:
> 
>> Reviewer: Catherine Meadows
>> Review result: Has Issues
> 
> Hi Catherine,
> 
> Thanks for the review of the dnsop-extended-error draft.  [and sorry
> for the delay in sending this]
> 
>> The Security Considerations section mentions some valid points, but it
>> is not made clear how they apply to extended DNS error messages (as
>> opposed to DNS error messages in general). It first makes the
>> non-obvious point that a significant number of clients, when receiving
>> a failure message about a DNS validation issue from a validated
>> resolver, will seek out an unvalidated server instead.  It is not
>> clear to me though whether you think that extending the types of DNS
>> error messages available (thus giving more information to the client)
>> would help address this problem.  You should say something about this.
>> Secondly, it discusses the security implications of the fact that DNS
>> error messages are unauthenticated.
>>
>> In addition, in the paragraph about the security implications of DNS error
>> messages being unauthenticated, you should say whether or not extending the
>> types of DNS error messages would improve the situation,   make it worse, have
>> no effect,  or is unclear.
> 
> You're right that we don't specify what to do in the security
> considerations section, though we do earlier in the document.
> Specifically it says (at least):
> 
>       Applications MUST continue to follow requirements from applicable
>       specifications on how to process RCODEs no matter what EDE values
>       are also received.
> 
> So maybe adding the following sentence to the security section addresses
> your issue?
> 
>       EDE content should be treated only as diagnostic information for
>       network operators and MUST NOT alter DNS protocol processing.
> 
> We could add a note as well about the scope of the document, though I
> think it can be derived from the above sentence:
> 
>       EDE content is not attempting to address the lack security in DNS
>       error messages.

I think both additions would be good and personally I think it is important enough to warrant some redundancy in the text.

-- 
Petr Špaček  @  CZ.NIC