From owner-freebsd-questions@freebsd.org Tue Nov 27 02:06:57 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0CB011151A2A for ; Tue, 27 Nov 2018 02:06:57 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) Received: from admin.sibptus.ru (admin.sibptus.ru [IPv6:2001:19f0:5001:21dc::10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 671C37A0D8 for ; Tue, 27 Nov 2018 02:06:56 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sibptus.ru; s=20181118; h=In-Reply-To:Message-ID:Subject:To:From:Date; bh=MU8zRlhx4xeVABYNclhNFGYqPB9fJACqVsuURXX8k4s=; b=G7x5JvYFBXii+ujFjBLigNrzo1 5/9MahvGnnlPhvHiSBlmSRS0/qAL6Thy4smOSm7W6C4fkXt5ce5RVjNU2AszBEl5v5NfVA4Jontd5 9qoGFA7TUpODh2BTM0LN0m7eiV9KQl6Mk90XsSLK2JR7c6HqV3jSqG28zlXvaWg0kzc8=; Received: from vas by admin.sibptus.ru with local (Exim 4.91 (FreeBSD)) (envelope-from ) id 1gRSm7-000LaV-7y; Tue, 27 Nov 2018 09:06:55 +0700 Date: Tue, 27 Nov 2018 09:06:55 +0700 From: Victor Sudakov To: Trond =?iso-8859-1?Q?Endrest=F8l?= Cc: FreeBSD questions Subject: Re: Invalid DKIM signatures in this list Message-ID: <20181127020655.GB79319@admin.sibptus.ru> References: <20181126125259.GB86999@admin.sibptus.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: X-PGP-Key: http://www.dreamwidth.org/pubkey?user=victor_sudakov X-PGP-Fingerprint: 10E3 1171 1273 E007 C2E9 3532 0DA4 F259 9B5E C634 User-Agent: Mutt/1.10.1 (2018-07-13) Sender: Victor Sudakov X-Rspamd-Queue-Id: 671C37A0D8 X-Spamd-Result: default: False [-2.20 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.84)[-0.836,0]; R_DKIM_ALLOW(-0.20)[sibptus.ru]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; NEURAL_HAM_LONG(-0.93)[-0.929,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[tomsk.su]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[sibptus.ru:+]; RCPT_COUNT_TWO(0.00)[2]; MX_GOOD(-0.01)[cached: admin.sibptus.ru]; NEURAL_HAM_SHORT(-0.02)[-0.022,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; IP_SCORE(0.10)[asn: 20473(0.58), country: US(-0.09)]; ASN(0.00)[asn:20473, ipnet:2001:19f0:5000::/38, country:US]; RCVD_COUNT_TWO(0.00)[2] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Nov 2018 02:06:57 -0000 Trond Endrest=F8l wrote: > >> Dear Colleagues, >> >> I have noticed that the Mailman which manages this list keeps the sender= 's >> "DKIM-Signature:" header intact but modifies the body of the message by = adding >> a footer. > >Are you sure? Absolutely. You can review this message to the list as a recent example:=20 http://termbin.com/rdsk > >When I received your message, the hash was made up using Message-ID, >Subject, To, From, Date, and In-Reply-To. I failed to find the latter >field. What "latter field" are you talking about? I'm talking about the *body* of the message being tampered with. The hash of the *body* is also=20 signed and present in the DKIM-Signature. --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/