From owner-freebsd-questions@freebsd.org Mon Nov 26 12:53:12 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 E69BD11337E9 for ; Mon, 26 Nov 2018 12:53:11 +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 576FA72256 for ; Mon, 26 Nov 2018 12:53:01 +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=Message-ID:Subject:To:From:Date:In-Reply-To; bh=lVqWu5A0dAGlwfZYAoaU7QQKfWUKOcE/0wgIPuvq06E=; b=oSl0oX15pzIzynwTUSwgm7sFrQ 9MJS9pRl3koZMQRB711V15zyprv+L4UHLfo/zD/iw211sA8weBVito1fZqHekD/VlMb78reY4xSfW UNLY9HH1RP+/pz8gORfMw7OmkB22I7i+Nxspbae5xEExcPr8YIxzhk4nqC+OdGjjQoVE=; Received: from vas by admin.sibptus.ru with local (Exim 4.91 (FreeBSD)) (envelope-from ) id 1gRGNn-000NfW-B6 for freebsd-questions@freebsd.org; Mon, 26 Nov 2018 19:52:59 +0700 Date: Mon, 26 Nov 2018 19:52:59 +0700 From: Victor Sudakov To: freebsd-questions@freebsd.org Subject: Invalid DKIM signatures in this list Message-ID: <20181126125259.GB86999@admin.sibptus.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline 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: 576FA72256 X-Spamd-Result: default: False [-0.53 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.55)[-0.550,0]; R_DKIM_ALLOW(-0.20)[sibptus.ru]; MX_INVALID(0.50)[greylisted]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[tomsk.su]; RCPT_COUNT_ONE(0.00)[1]; DKIM_TRACE(0.00)[sibptus.ru:+]; NEURAL_SPAM_LONG(0.04)[0.045,0]; NEURAL_HAM_SHORT(-0.18)[-0.178,0]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; IP_SCORE(0.15)[asn: 20473(0.87), 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: Mon, 26 Nov 2018 12:53:12 -0000 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. This behavior invalidates the sender's digital signature with "dkim=fail (body hash mismatch; body probably modified in transit)". I think, according to the common sense and RFC6377, the Mailman should either remove the "DKIM-Signature:" when modifying the body, or refrain from modifying the body, or add its own valid "DKIM-Signature:" from scratch. What is currently happening does not make sense. Whom do I contact about it? An example of this behaviour can be seen in the message with Message-Id: <20181126081310.026376ddcaad286971909626@sohara.org> and others. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/