IETF Logo Mail Archive

Re: [TLS] Deprecating alert levels

Hubert Kario <hkario@redhat.com> Mon, 17 October 2016 18:06 UTC

Return-Path: <hkario@redhat.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9DA4112711D for <tls@ietfa.amsl.com>; Mon, 17 Oct 2016 11:06:43 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.353
X-Spam-Level:
X-Spam-Status: No, score=-7.353 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-0.431, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
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 0PQNOFhI6OGq for <tls@ietfa.amsl.com>; Mon, 17 Oct 2016 11:06:42 -0700 (PDT)
Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4A05E126D73 for <tls@ietf.org>; Mon, 17 Oct 2016 11:06:42 -0700 (PDT)
Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BFE2FC057FAD; Mon, 17 Oct 2016 18:01:02 +0000 (UTC)
Received: from pintsize.usersys.redhat.com (dhcp-0-191.brq.redhat.com [10.34.0.191]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u9HI11c1023962 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 17 Oct 2016 14:01:02 -0400
From: Hubert Kario <hkario@redhat.com>
To: tls@ietf.org
Date: Mon, 17 Oct 2016 20:00:49 +0200
Message-ID: <3870206.scrKBWvm1A@pintsize.usersys.redhat.com>
User-Agent: KMail/5.3.1 (Linux/4.7.6-200.fc24.x86_64; KDE/5.26.0; x86_64; ; )
In-Reply-To: <201610171326.10236.davemgarrett@gmail.com>
References: <20161017170418.49DD41A564@ld9781.wdf.sap.corp> <201610171326.10236.davemgarrett@gmail.com>
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="nextPart1864286.iiPKSO8LT2"; micalg="pgp-sha512"; protocol="application/pgp-signature"
X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24
X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 17 Oct 2016 18:01:02 +0000 (UTC)
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/sC8tgj-buSSiHe0ks0gWpYpk-R4>
Subject: Re: [TLS] Deprecating alert levels
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.17
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: <https://mailarchive.ietf.org/arch/browse/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: Mon, 17 Oct 2016 18:06:43 -0000

On Monday, 17 October 2016 13:26:09 CEST Dave Garrett wrote:
> On Monday, October 17, 2016 01:04:18 pm Martin Rex wrote:
> > This list is already missing the warning-level "unrecognized_name" alert,
> > and such a change would imply that all new/unrecognized alerts are going
> > to be treated as fatal forever (i.e. that no new warning-level alerts
> > can ever be defined).
> 
> That's already true:
> 
> https://tools.ietf.org/html/draft-ietf-tls-tls13-16#section-6
> https://tlswg.github.io/tls13-spec/#alert-protocol
> "Unknown alert types MUST be treated as fatal."
> 
> Changelog says this change was made for draft 14.

but unrecognized_name is defined (it's a part of MTI extension in fact), and 
any value defined by a new RFC automatically becomes a known alert

Not to mention that implementations are not supposed to send unknown alerts 
unless negotiated by extension.

-- 
Regards,
Hubert Kario
Senior Quality Engineer, QE BaseOS Security team
Web: www.cz.redhat.com
Red Hat Czech s.r.o., Purkyňova 99/71, 612 45, Brno, Czech Republic

v2.23.0 | Report a Bug | By Email