Re: [dmarc-ietf] third party authorization, not, was non-mailing list
Hector Santos <hsantos@isdg.net> Sun, 30 August 2020 02:23 UTC
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Message-ID: <5F4B0DAD.1050208@isdg.net>
Date: Sat, 29 Aug 2020 22:23:41 -0400
From: Hector Santos <hsantos@isdg.net>
Reply-To: hsantos@isdg.net
Organization: Santronics Software, Inc.
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To: Jim Fenton <fenton@bluepopcorn.net>, Dotzero <dotzero@gmail.com>, Doug Foster <fosterd=40bayviewphysicians.com@dmarc.ietf.org>
CC: IETF DMARC WG <dmarc@ietf.org>
References: <20200824172403.A927C1F14BF5@ary.qy> <5fe7d5c2-7330-c9fb-2856-e7dfc2175c82@tana.it> <CAJ4XoYc1vutV61E-66DHWcdOxHmCUWiC0HC0AmiRYUcMxLgcCQ@mail.gmail.com> <1fe7a47f-4ebc-7621-2c1-e4803473e8d7@taugh.com> <CAJ4XoYf3_y4tb5JYm5fGndqxKN+070LvZ6i5kjHKqH0NnbHnhg@mail.gmail.com> <001801d67bce$bdf97510$39ec5f30$@bayviewphysicians.com> <CAJ4XoYdR-kHARvkYjbbyqoEnx8YV5RP4x1z40M3-z9ap1ypcRg@mail.gmail.com> <10ed5aec-7e4f-b6d4-0564-613fd92ebf72@bluepopcorn.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/VwFy6mOeJvtnBwd8s_vi0RFfoA0>
Subject: Re: [dmarc-ietf] third party authorization, not, was non-mailing list
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On 8/26/2020 5:00 PM, Jim Fenton wrote: > On 8/26/20 10:54 AM, Dotzero wrote: >> >> >> On Wed, Aug 26, 2020 at 1:32 PM Doug Foster >> <fosterd=40bayviewphysicians.com@dmarc.ietf.org >> <mailto:40bayviewphysicians.com@dmarc.ietf.org>> wrote: >> >> Are the weak signatures vulnerable to a replay attack? I >> thought that one of the reasons that DKIM signatures included >> the whole body was to prevent the signature from being reused. >> >> DF >> >> >> Not particularly vulnerable. The requirement is that you have the >> "weak signature" plus the intermediary full DKIM signature. This >> let's the validator/receiver know that the originating domain knew >> that the intermediary might break the originating domains DKIM >> signature but the validator/receiver would have the DKIM signature >> of the intermediary. The "weak signature" is only validated against >> that specific message and headers it signed and that specific >> intermediary. It's not a generic/general signature. > > > It sounds like the weak signature is just a regular DKIM signature > plus the designation of the intermediary, and the "weak" part is that > you don't check the body hash against the body. Have I got that right? Yes. ATPS vs Conditional Signature The end goal is technically the same. Author Domain authorizing a 3rd party signer. The key difference is DNS. ATPS uses DNS to authorize the signer. Conditional signature has the extra tag to define an expected 3rd party signature by a 3rd party domain uplink. For the signing code, there is no change for ATPS. Conditional requires significant signer code change. For the verifying code, the DMARC verifier adds ATPS DNS lookup checks if 1st != 3rd party domains differ or it can also add conditional signatures checks. We should ALLOW both to be explored. For conditional, you don't need a DMARC tag extension. The existence of the extra tag triggers the logic. For ATPS RFC6541, it was designed to piggyback off ADSP. So ATPS will need to be updated to use DMARCbis. The Domain sets the atps=y extension tag to trigger the logic. -- Hector Santos, https://secure.santronics.com https://twitter.com/hectorsantos
- [dmarc-ietf] non-mailing list use case for differ… Autumn Tyr-Salvia
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Laura Atkins
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Laura Atkins
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Hector Santos
- Re: [dmarc-ietf] non-mailing list use case for di… Doug Foster
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Todd Herr
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Todd Herr
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… Autumn Tyr-Salvia
- Re: [dmarc-ietf] non-mailing list use case for di… Todd Herr
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Laura Atkins
- Re: [dmarc-ietf] non-mailing list use case for di… Todd Herr
- Re: [dmarc-ietf] non-mailing list use case for di… Laura Atkins
- Re: [dmarc-ietf] non-mailing list use case for di… Hector Santos
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… Jeremy Harris
- Re: [dmarc-ietf] non-mailing list use case for di… Ken O'Driscoll
- Re: [dmarc-ietf] non-mailing list use case for di… Hector Santos
- Re: [dmarc-ietf] non-mailing list use case for di… Hector Santos
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Murray S. Kucherawy
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Jim Fenton
- Re: [dmarc-ietf] non-mailing list use case for di… Luis E. Muñoz
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- [dmarc-ietf] LSAP - Lightweight Signer Authorizat… Hector Santos
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Neil Anuskiewicz
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Murray S. Kucherawy
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… Ken O'Driscoll
- Re: [dmarc-ietf] non-mailing list use case for di… Benny Pedersen
- Re: [dmarc-ietf] non-mailing list use case for di… Kurt Andersen (b)
- Re: [dmarc-ietf] non-mailing list use case for di… Jim Fenton
- Re: [dmarc-ietf] non-mailing list use case for di… Jim Fenton
- Re: [dmarc-ietf] non-mailing list use case for di… Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Autumn Tyr-Salvia
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Murray S. Kucherawy
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… John Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… Hannu Aronsson
- Re: [dmarc-ietf] non-mailing list use case for di… Hannu Aronsson
- Re: [dmarc-ietf] non-mailing list use case for di… Tõnu Tammer
- Re: [dmarc-ietf] non-mailing list use case for di… Dave Crocker
- Re: [dmarc-ietf] non-mailing list use case for di… Jim Fenton
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Douglas E. Foster
- Re: [dmarc-ietf] third party authorization, not, … John Levine
- Re: [dmarc-ietf] third party authorization, not, … Dave Crocker
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Neil Anuskiewicz
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] non-mailing list use case for di… Autumn Tyr-Salvia
- Re: [dmarc-ietf] non-mailing list use case for di… John R Levine
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Dave Crocker
- Re: [dmarc-ietf] third party authorization, not, … John Levine
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Dave Crocker
- Re: [dmarc-ietf] third party authorization, not, … Hector Santos
- Re: [dmarc-ietf] Time for a change Douglas E. Foster
- Re: [dmarc-ietf] Time for a change Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] Time for a change Murray S. Kucherawy
- Re: [dmarc-ietf] Time for a change Dave Crocker
- Re: [dmarc-ietf] Time for a change Dotzero
- Re: [dmarc-ietf] non-mailing list use case for di… Alessandro Vesely
- Re: [dmarc-ietf] non-mailing list use case for di… Autumn Tyr-Salvia
- Re: [dmarc-ietf] finer grained org domain John R Levine
- Re: [dmarc-ietf] finer grained org domain Tim Wicinski
- Re: [dmarc-ietf] finer grained org domain Dave Crocker
- Re: [dmarc-ietf] finer grained org domain Dave Crocker
- Re: [dmarc-ietf] finer grained org domain Seth Blank
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] Time for a change Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Kurt Andersen (b)
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Douglas E. Foster
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Tim Draegen
- Re: [dmarc-ietf] third party authorization, not, … Brandon Long
- Re: [dmarc-ietf] third party authorization, not, … Jesse Thompson
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Douglas E. Foster
- Re: [dmarc-ietf] non-mailing list use case for di… Jim Fenton
- Re: [dmarc-ietf] non-mailing list use case for di… Brandon Long
- Re: [dmarc-ietf] non-mailing list use case for di… Jesse Thompson
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … John Levine
- Re: [dmarc-ietf] third party authorization, not, … Douglas E. Foster
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Laura Atkins
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … John R Levine
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … John R Levine
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Jim Fenton
- Re: [dmarc-ietf] third party authorization, not, … John Levine
- Re: [dmarc-ietf] third party authorization, not, … Jim Fenton
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Doug Foster
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Jim Fenton
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Douglas E. Foster
- Re: [dmarc-ietf] third party authorization, not, … Dotzero
- Re: [dmarc-ietf] third party authorization, not, … Jim Fenton
- Re: [dmarc-ietf] third party authorization, not, … Hector Santos
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] third party authorization, not, … Douglas E. Foster
- Re: [dmarc-ietf] third party authorization, not, … Alessandro Vesely
- Re: [dmarc-ietf] draft-levine-dkim-conditional-04… John Levine
- Re: [dmarc-ietf] draft-levine-dkim-conditional-04… Douglas E. Foster
- Re: [dmarc-ietf] draft-levine-dkim-conditional-04… Murray S. Kucherawy
- Re: [dmarc-ietf] third party authorization, not, … Murray S. Kucherawy
- Re: [dmarc-ietf] my forward signer draft, third p… John Levine
- Re: [dmarc-ietf] my forward signer draft, third p… Rolf E. Sonneveld