[TLS] Operational consideration for downgrade SCSV draft

Martin Thomson <martin.thomson@gmail.com> Tue, 21 October 2014 08:36 UTC

Return-Path: <martin.thomson@gmail.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C8FA41A006F for <tls@ietfa.amsl.com>; Tue, 21 Oct 2014 01:36:47 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wPiH4jiKcKJZ for <tls@ietfa.amsl.com>; Tue, 21 Oct 2014 01:36:45 -0700 (PDT)
Received: from mail-la0-x22b.google.com (mail-la0-x22b.google.com [IPv6:2a00:1450:4010:c03::22b]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F17281AD0AF for <tls@ietf.org>; Tue, 21 Oct 2014 01:21:39 -0700 (PDT)
Received: by mail-la0-f43.google.com with SMTP id mc6so567897lab.30 for <tls@ietf.org>; Tue, 21 Oct 2014 01:21:38 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=WfNpQUxskJjH1ttiFPkpmgPBhtngZjz5Z8H+f/j1o3s=; b=dKMkZ17GiEA6+sLnHdx7bjrHI1YS1lW5HZsJFCv3dDhcS581pdeh6/SMEjpJhae/Wy G0Buw7J2RigEn6syYOTYJWLspVQv3QqEo8L+C9phB9OVohZCeyJY/6tqfc89VJjHvWTf OiggSdHlRK9sZvRiSn1YSPQamyFzkfP5uVmpUBso9XAJqd+p67G8rrjoiCPVqBTifwFN DQQpXSECCF7Qzrfjajyi7g2Nc1cGavGEGU1lrLkAezl8EIfJaV6ib7VXSO5jBHNvZCNq 2t8z9LilXe9pfUX3kbT+DUV0G0FT/V7gIUwfNBkiCcqWzGSC7c1Wi9BDmyz4civpPYkz DDHw==
MIME-Version: 1.0
X-Received: by 10.112.210.102 with SMTP id mt6mr15961009lbc.73.1413879698354; Tue, 21 Oct 2014 01:21:38 -0700 (PDT)
Received: by 10.25.215.217 with HTTP; Tue, 21 Oct 2014 01:21:38 -0700 (PDT)
Date: Tue, 21 Oct 2014 01:21:38 -0700
Message-ID: <CABkgnnXOYO9brnPmWsoCyuQ007TFio0NrHAoB=rW1rVmBUCMbA@mail.gmail.com>
From: Martin Thomson <martin.thomson@gmail.com>
To: Bodo Moeller <bmoeller@acm.org>, "tls@ietf.org" <tls@ietf.org>
Content-Type: text/plain; charset="UTF-8"
Archived-At: http://mailarchive.ietf.org/arch/msg/tls/N4TsJfD7tETL6UqzBdOm17RfPsI
Subject: [TLS] Operational consideration for downgrade SCSV draft
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 21 Oct 2014 08:36:48 -0000

As discussed, something like this might be good:

"Note: Upgrading servers to support this SCSV in a cluster containing
version intolerant nodes can result in excessive numbers of failures.
Clients that learn of version intolerance from the intolerant nodes
will cause upgraded nodes to generate inappropriate_fallback alerts."