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Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 24 October 2017 20:04 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Tue, 24 Oct 2017 13:03:57 -0700
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To: Scott Kitterman <sklist@kitterman.com>
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Subject: Re: [Dcrup] Adam Roach's No Objection on draft-ietf-dcrup-dkim-usage-04: (with COMMENT)
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On Tue, Oct 24, 2017 at 12:58 PM, Murray S. Kucherawy <superuser@gmail.com>
wrote:

> On Thu, Oct 19, 2017 at 3:54 AM, Scott Kitterman <sklist@kitterman.com>
> wrote:
>
>> My assumption had been that since there's no valid signature with
>> rsa-sha1, there's nothing to even consider putting in an A-R header field.
>>
>> I think the only result that can go in this case is None.  I hadn't
>> thought we'd need to say that, but I guess maybe we do.
>>
>
> I think "policy" is the right way to go.  There's nothing technically
> wrong with an rsa-sha1 signature, but you're deciding not to accept it.
> It's the same as you deciding you're not going to accept a perfectly valid
> rsa-sha256 signature on a message simply because that signature didn't
> include the Subject field.
>

In fact I would claim that by the definitions in Section 2.7.1 of RFC7601,
"policy" is the only option.

-MSK

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