Re: [ietf-822] one can re-sign without a permission to re-sign header
Ned Freed <ned.freed@mrochek.com> Sat, 26 April 2014 14:43 UTC
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Date: Sat, 26 Apr 2014 07:24:24 -0700
From: Ned Freed <ned.freed@mrochek.com>
In-reply-to: "Your message dated Sat, 26 Apr 2014 12:31:35 +0200" <535B8B07.6090307@tana.it>
References: <535646AA.2080400@pscs.co.uk> <20140422202403.42908.qmail@joyce.lan> <01P6Y9IJSOEG000052@mauve.mrochek.com> <535B8B07.6090307@tana.it>
To: Alessandro Vesely <vesely@tana.it>
Archived-At: http://mailarchive.ietf.org/arch/msg/ietf-822/yuog4BbKq5BEoNXTJ-U0-re-zyg
Cc: ietf-822@ietf.org
Subject: Re: [ietf-822] one can re-sign without a permission to re-sign header
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s> On Wed 23/Apr/2014 00:13:15 +0200 Ned Freed wrote: > > [...] > >>> I know people think I'm wrong, but I think it needs to be looked at a > >>> different way. As a recipient, I don't want 'proof' that this message > >>> came from Alessandro, I want 'proof' that it came from the > >>> ietf-822@ietf.org mailing list. > > > >> I think you're right. > > > > I concur as well. > Eh? I agree a /receiver/ can do a better job by considering mailing > list messages as an already filtered/moderated mail stream, rather > than a collection of independent messages. Talking domain-level > authentication, even the local part is irrelevant. As a /recipient/, > however, the list where a message came from, ietf-822, ietf-smtp, or > whatever, is a rather circumstantial attribute of a message. I > obviously care much more about who says what in which thread... You're conflating completely different things here. We're talking about assessing the validity of a message, not about the value of the content of different valid messages. And the fact is that essentially every mailing list I'm on - and I'm on a lot of them run by a lot of different organizations - is very good at blocking junk mail. As such, knowing that a message came from one of the lists I'm on - even if I don't recognize the person posting or the topic they're posting about - is more than enough to tell me that the message isn't garbage. And not to be catty or anything, but this indicator is far more reliable than getting a DKIM-signed message from, say, yahoo.com or aol.com. Indeed, on this point, the SANS Digest had this to say about the situation at AOL: --AOL Locks Down Servers After Spam Deluge (April 22 & 23, 2014) Users have recently noticed a higher than usual volume of spam coming from AOL email addresses. AOL has now locked down its email servers to quell a spoof attack that is generating large quantities of spam. AOL has implemented a more stringent email validation process that instructs mailbox providers to reject email that appears to be associated with an AOL domain if the message did not originate from an AOL server. Reports also say that AOL Mail was breached and some accounts hijacked. http://www.theregister.co.uk/2014/04/23/aol_mail_locks_down_email_servers_to_deal_with_tsunami_of_spam/ http://www.cnet.com/news/aol-imposes-stricter-email-rules-to-stem-spoofing-attack/ http://threatpost.com/aol-email-hacked-by-spoofers-to-send-spam/105629 [Editor's Note (Murray): Received one from a neighbor and one from a family member on the same day. I see these often enough that I have a standard reply. "If you did not send the message below, your e-mail account may be compromised. Please change your password. Recipients of your message who clicked on the embedded URL may have compromised their systems."] Like Murray, I see these messages often enough that I have a standard reply to them. > >> I've said for years that lists should sign their mail with their > >> own DKIM keys, and recipients should look at those list > >> signatures to filter the mail. > > > > I'm not even sure that's necessary, but of course it can't hurt. > > Indeed, right now, with the exception of IETF lists, having a > > signature makes the odds it's spam more, not less, likely. > SPF authentication covers most subscribers, but not those who have > their mail forwarded to different sites (unless the forwarders use > SRS). DKIM signatures survive forwarding. Sometimes they do, sometimes they don't. Depends on a lot of factors. > Neither method is useful > for DMARC because the domain being authenticated is that of the > mailing list, which is aligned with "To:" rather than "From:". > Is it possible to introduce "To:" as a _secondary identifier_ in the > DMARC mechanism? In that case a weak DKIM signature could be the > element which authorizes receivers to use the secondary identifier. Maybe, but I doubt very much this would be useful. Indeed, the reason we're in this mess is because DMARC attaches semantic restrictions to the From: field. Attaching more semantics to more header fields does not seem like a move in the right direction to me. I'd much rather pursue Pete's approach. Ned
- [ietf-822] A permission to re-sign header John Levine
- Re: [ietf-822] A permission to re-sign header Alessandro Vesely
- Re: [ietf-822] A permission to re-sign header John Levine
- Re: [ietf-822] A permission to re-sign header Hector Santos
- Re: [ietf-822] A permission to re-sign header Murray S. Kucherawy
- Re: [ietf-822] A permission to re-sign header John R Levine
- Re: [ietf-822] A permission to re-sign header Murray S. Kucherawy
- Re: [ietf-822] A permission to re-sign header John R Levine
- Re: [ietf-822] A permission to re-sign header Pete Resnick
- Re: [ietf-822] A permission to re-sign header Pete Resnick
- Re: [ietf-822] A permission to re-sign header John R Levine
- Re: [ietf-822] A permission to re-sign header Pete Resnick
- Re: [ietf-822] A permission to re-sign header John R Levine
- Re: [ietf-822] A permission to re-sign header Alessandro Vesely
- Re: [ietf-822] A permission to re-sign header Michael Richardson
- Re: [ietf-822] A permission to re-sign header Michael Richardson
- Re: [ietf-822] A permission to re-sign header Theodore Ts'o
- Re: [ietf-822] A permission to re-sign header Pete Resnick
- Re: [ietf-822] A permission to re-sign header Miles Fidelman
- Re: [ietf-822] A permission to re-sign header John Levine
- Re: [ietf-822] one can re-sign without a permissi… Ned Freed
- Re: [ietf-822] one can re-sign without a permissi… Alessandro Vesely
- Re: [ietf-822] A permission to re-sign header Ned Freed
- Re: [ietf-822] A permission to re-sign header Alessandro Vesely
- Re: [ietf-822] A permission to re-sign header Paul Smith
- Re: [ietf-822] don't need a permission to re-sign… John Levine
- Re: [ietf-822] don't need a permission to re-sign… Ned Freed
- Re: [ietf-822] don't need a permission to re-sign… John R Levine
- Re: [ietf-822] don't need a permission to re-sign… Ned Freed
- Re: [ietf-822] one can re-sign without a permissi… Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Ned Freed
- Re: [ietf-822] one can re-sign without a permissi… Pete Resnick
- Re: [ietf-822] one can re-sign without a permissi… Douglas Otis
- [ietf-822] We need a DKIM Policy Working Group Hector Santos
- Re: [ietf-822] We need a DKIM Policy Working Group S Moonesamy
- Re: [ietf-822] one can re-sign without a permissi… John Levine
- Re: [ietf-822] one can re-sign without a permissi… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Miles Fidelman
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Douglas Otis
- Re: [ietf-822] one can re-sign without a permissi… Pete Resnick
- Re: [ietf-822] one can re-sign without a permissi… Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Paul Smith
- Re: [ietf-822] one can re-sign without a permissi… John R Levine
- Re: [ietf-822] one can re-sign without a permissi… Hector Santos
- Re: [ietf-822] one can re-sign without a permissi… Douglas Otis
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Hector Santos
- [ietf-822] WSJ/gmail/ML, was a permission to... Alessandro Vesely
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Paul Smith
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Rolf E. Sonneveld
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Hector Santos
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Michael Richardson
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Paul Smith
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Miles Fidelman
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Arnt Gulbrandsen
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Ned Freed
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Dave Crocker
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Ned Freed
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Arnt Gulbrandsen
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Bart Schaefer
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Hector Santos
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Michael Richardson
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Michael Richardson
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Ned Freed
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Michael Richardson
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Michael Richardson
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Russ Allbery
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Brandon Long
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Brandon Long
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Arnt Gulbrandsen
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Paul Smith
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Hector Santos
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Ned Freed
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… S Moonesamy
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Russ Allbery
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Hector Santos
- Re: [ietf-822] one can re-sign without a permissi… Brandon Long
- Re: [ietf-822] one can re-sign without a permissi… Murray S. Kucherawy
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Miles Fidelman
- Re: [ietf-822] one can re-sign without a permissi… John R Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Ned Freed
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… S Moonesamy
- Re: [ietf-822] one can re-sign without a permissi… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Miles Fidelman
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Scott Kitterman
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Russ Allbery
- Re: [ietf-822] one can re-sign without a permissi… Murray S. Kucherawy
- Re: [ietf-822] one can re-sign without a permissi… John R Levine
- Re: [ietf-822] one can re-sign without a permissi… Hector Santos
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… S Moonesamy
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Paul Smith
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Miles Fidelman
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… John Levine
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Brandon Long
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Brandon Long
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Russ Allbery
- [ietf-822] Aptness of DKIM for MLs Alessandro Vesely
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Alessandro Vesely
- Re: [ietf-822] Aptness of DKIM for MLs S Moonesamy
- Re: [ietf-822] Aptness of DKIM for MLs Alessandro Vesely
- Re: [ietf-822] Aptness of DKIM for MLs S Moonesamy
- Re: [ietf-822] Aptness of DKIM for MLs Hector Santos
- Re: [ietf-822] Aptness of DKIM for MLs Douglas Otis
- Re: [ietf-822] Aptness of DKIM for MLs Alessandro Vesely
- Re: [ietf-822] Aptness of DKIM for MLs Douglas Otis
- Re: [ietf-822] WSJ/gmail/ML, was a permission to.… Douglas Otis
- Re: [ietf-822] Aptness of DKIM for MLs Alessandro Vesely
- Re: [ietf-822] one can re-sign without a permissi… Douglas Otis