Re: [TLS] HTTP, Certificates, and TLS

mrex@sap.com (Martin Rex) Thu, 21 July 2016 16:41 UTC

Return-Path: <mrex@sap.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 B600912D7A6 for <tls@ietfa.amsl.com>; Thu, 21 Jul 2016 09:41:45 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.922
X-Spam-Level:
X-Spam-Status: No, score=-6.922 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, 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 8w0h2k3ORIJr for <tls@ietfa.amsl.com>; Thu, 21 Jul 2016 09:41:43 -0700 (PDT)
Received: from smtpde02.smtp.sap-ag.de (smtpde02.smtp.sap-ag.de [155.56.68.140]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E04F812D79C for <tls@ietf.org>; Thu, 21 Jul 2016 09:41:42 -0700 (PDT)
Received: from mail06.wdf.sap.corp (mail06.sap.corp [194.39.131.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtpde02.smtp.sap-ag.de (Postfix) with ESMTPS id 3rwKLD69C2z25HF; Thu, 21 Jul 2016 18:41:40 +0200 (CEST)
X-purgate-ID: 152705::1469119300-00000827-EE67469B/0/0
X-purgate-size: 722
X-purgate: clean
X-purgate: This mail is considered clean (visit http://www.eleven.de for further information)
X-purgate-Ad: Categorized by eleven eXpurgate (R) http://www.eleven.de
X-purgate-type: clean
X-SAP-SPAM-Status: clean
Received: from ld9781.wdf.sap.corp (ld9781.wdf.sap.corp [10.21.82.193]) by mail06.wdf.sap.corp (Postfix) with ESMTP id 3rwKLD3zg8zkwxl; Thu, 21 Jul 2016 18:41:40 +0200 (CEST)
Received: by ld9781.wdf.sap.corp (Postfix, from userid 10159) id 822601A504; Thu, 21 Jul 2016 18:41:40 +0200 (CEST)
In-Reply-To: <BLUPR03MB1330C3D2AEC4876A9E74635387090@BLUPR03MB1330.namprd03.prod.outlook.com>
To: Mike Bishop <Michael.Bishop@microsoft.com>
Date: Thu, 21 Jul 2016 18:41:40 +0200 (CEST)
X-Mailer: ELM [version 2.4ME+ PL125 (25)]
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="US-ASCII"
Message-Id: <20160721164140.822601A504@ld9781.wdf.sap.corp>
From: mrex@sap.com (Martin Rex)
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/4WDbi_V0Dv6v3PFXrrM0ROSyoZw>
Cc: "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] HTTP, Certificates, and TLS
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
Reply-To: mrex@sap.com
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: Thu, 21 Jul 2016 16:41:46 -0000

Mike Bishop wrote:
>
> I assume you're referring to Section 3, SNI's ServerNameList MUST NOT
> contain more than one name of a given type?
>
> Or are you referring to the (lower-case) must not resume if SNI and the
> certificate used in the resumed session differ?

My (online) copy of rfc6066 has a (fully reasonable) upper-case MUST NOT.


Last paragraph on page 7, rfc6066 (TLS extension server_name_indication)

https://tools.ietf.org/html/rfc6066#page-7

   A server that implements this extension MUST NOT accept the request
   to resume the session if the server_name extension contains a
   different name.  Instead, it proceeds with a full handshake to
   establish a new session.


-Martin