On 30/Jan/12 05:59, Scott Kitterman wrote:
> On Sunday, January 29, 2012 08:42:18 PM Murray S. Kucherawy wrote:
>>> From: ietf.org On Behalf Of Scott Kitterman
>>
>>> I think the key is that the information about where reports need to go
>>> needs to be found in DNS, not in the message, so if one takes the
>>> signing domain and looks up the record there, it will give you the
>>> localpart to go with that domain.  The r= flag you propose would (AIUI)
>>> be the trigger to do the DNS lookup to see if there's a DNS record
>>> asking for reports.
>>> 
>>> Is along the lines of what you intend?
>> 
>> Specifically in the signer's DNS, but yes, that's right.
> 
> Sounds good.  Thanks,

+1: doing so is more consistent with the generic idea that "domain
claims some responsibility", and with the indication given in marf-as.

However, flag-triggered lookups leave report requests to the signer's
mercies.  If this message had a forged ietf.org's signature, there is
no way they can say they'd like to know about it.  Perhaps, it's fair
to say the verifier MAY lookup the _report RR anyway --which it would
tend to do if it remembers r= from signatures it saw earlier.
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