Re: [dmarc-ietf] Authentication of reports
Michael Thomas <mike@mtcc.com> Wed, 20 January 2021 23:02 UTC
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From: Michael Thomas <mike@mtcc.com>
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Date: Wed, 20 Jan 2021 15:01:55 -0800
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Subject: Re: [dmarc-ietf] Authentication of reports
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On 1/20/21 2:59 PM, Seth Blank wrote: > Michael, please open a ticket. I think you're right and some > consideration around this is needed in the document. What about the https part? If it's not in scope I don't want to add noise. Mike > > On Wed, Jan 20, 2021 at 2:56 PM Murray S. Kucherawy > <superuser@gmail.com <mailto:superuser@gmail.com>> wrote: > > On Wed, Jan 20, 2021 at 1:21 PM Michael Thomas <mike@mtcc.com > <mailto:mike@mtcc.com>> wrote: > > I just scanned through DMARC and I couldn't find any security > requirements/mechanisms for the failure reports. I would think > at the > very least the receiver consuming the reports ought make > certain that > the report at the very least have either a valid DKIM > signature or a SPF > pass. Unauthenticated data is always the source of mischief, > and I'm > sure that there have to be attacks that are possible with > unauthenticated reports. At the very least this should be a > security > consideration, and most likely should have some normative > language to > back it up. > > > I thought the usual rules about when you should or shouldn't trust > a message ought to be applied, but I guess we never actually said > that in the document. We certainly could. > > Since I'm sort of new, it's been unclear to me whether whether > having a > new https transport mechanism is in scope or not -- it seems > to come up > pretty often -- but I'm not sure how people would propose to > authenticate the report sending client. That seems to me to be > a basic > security requirement for any new delivery method. The problem > here is > there isn't a client certificate to determine where the report > is coming > from or any other identifying mechanism. An alternative might > be to DKIM > sign the report itself, but the long and short is that it > would need to > be addressed. > > > As I recall DMARC originally (in its pre-RFC versions) did have > "https" as a supported scheme for "rua", but since nobody > implemented it during the years DMARC was in development, it got > dropped before publication. > > -MSK > _______________________________________________ > dmarc mailing list > dmarc@ietf.org <mailto:dmarc@ietf.org> > https://www.ietf.org/mailman/listinfo/dmarc > <https://www.ietf.org/mailman/listinfo/dmarc> > > > > -- > *Seth Blank*| VP, Standards and New Technologies > *e:*seth@valimail.com <mailto:seth@valimail.com> > *p:*415.273.8818 > > > This email and all data transmitted with it contains confidential > and/or proprietary information intended solely for the use of > individual(s) authorized to receive it. If you are not an intended and > authorized recipient you are hereby notified of any use, disclosure, > copying or distribution of the information included in this > transmission is prohibited and may be unlawful. Please immediately > notify the sender by replying to this email and then delete it from > your system. > > > _______________________________________________ > dmarc mailing list > dmarc@ietf.org > https://www.ietf.org/mailman/listinfo/dmarc
- [dmarc-ietf] Authentication of reports Michael Thomas
- Re: [dmarc-ietf] Authentication of reports Murray S. Kucherawy
- Re: [dmarc-ietf] Authentication of reports Seth Blank
- Re: [dmarc-ietf] Authentication of reports Michael Thomas
- Re: [dmarc-ietf] Authentication of reports Michael Thomas
- Re: [dmarc-ietf] Authentication of reports Seth Blank
- Re: [dmarc-ietf] Authentication of reports Michael Thomas
- Re: [dmarc-ietf] Authentication of reports Michael Thomas