Re: [DNSOP] I-D Action: draft-ietf-dnsop-server-cookies-00.txt

Willem Toorop <willem@nlnetlabs.nl> Mon, 09 September 2019 13:51 UTC

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From: Willem Toorop <willem@nlnetlabs.nl>
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Date: Mon, 9 Sep 2019 15:51:26 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/Q5o8iEjt7t5ozPMDrbRjTPiGPyo>
Subject: Re: [DNSOP] I-D Action: draft-ietf-dnsop-server-cookies-00.txt
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On 09-09-19 14:52, Paul Wouters wrote:
> On Mon, 9 Sep 2019, Willem Toorop wrote:
> 
>> The only change since the previous version (i.e.
>> draft-sury-toorop-dnsop-server-cookies-00) is that we no longer
>> recommend to include the Client IP address with constructing client
>> cookies:
>>
>> When implementing DNS Cookies, several DNS vendors found that
>> impractical as the Client Cookie is typically computed before the Client
>> IP address is known. Therefore, the requirement to put Client IP address
>> as input to was removed, and it simply RECOMMENDED to disable the DNS
>> Cookies when privacy is required. herefore, the requirement to put
>> Client IP address as input to was removed, and it simply RECOMMENDED to
>> disable the DNS Cookies when privacy is required.
> 
> Wouldn't this enable me to obtain some cookies from within a network,
> and then re-use those cookies from outside the network? The reason for
> including the IP was the pin the cookie to the specific client IP.

No, Client IP is still included in *Server* Cookie generation, just not
in Client Cookie construction.  So the re-user from different network
protection is still there.

> I cannot see a diff because you didn't instruct the data tracker that
> this adopted document continues from the individual submission :(

Oh, sorry.  I indicated that it replaced the previous draft (and
Donald's) that is not correct?