Re: [TLS] draft-rescorla-tls-renegotiate and MITM resistance
Yair Elharrar <Yair.Elharrar@audiocodes.com> Mon, 09 November 2009 19:46 UTC
Return-Path: <Yair.Elharrar@audiocodes.com>
X-Original-To: tls@core3.amsl.com
Delivered-To: tls@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id 82EDB3A676A for <tls@core3.amsl.com>; Mon, 9 Nov 2009 11:46:47 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.691
X-Spam-Level:
X-Spam-Status: No, score=-0.691 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_ILLEGAL_IP=1.908]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7OCmPolf7yU9 for <tls@core3.amsl.com>; Mon, 9 Nov 2009 11:46:46 -0800 (PST)
Received: from incoming.audiocodes.com (mail1.audiocodes.com [195.189.193.19]) by core3.amsl.com (Postfix) with ESMTP id 644043A657C for <tls@ietf.org>; Mon, 9 Nov 2009 11:46:45 -0800 (PST)
Received: from unknown (HELO Mail1.AudioCodes.com) ([10.1.0.13]) by incoming.audiocodes.com with ESMTP; 09 Nov 2009 21:23:56 +0200
Received: from aclmail01.corp.audiocodes.com ([fe80:0000:0000:0000:00d9:1fca:234.186.136.40]) by aclcas.corp.audiocodes.com ([10.1.0.13]) with mapi; Mon, 9 Nov 2009 21:47:42 +0200
From: Yair Elharrar <Yair.Elharrar@audiocodes.com>
To: David-Sarah Hopwood <david-sarah@jacaranda.org>, "tls@ietf.org" <tls@ietf.org>
Date: Mon, 09 Nov 2009 21:47:42 +0200
Thread-Topic: [TLS] draft-rescorla-tls-renegotiate and MITM resistance
Thread-Index: Acphc9u7eUplOF1gQveGv8D+g/1dggAAHVlE
Message-ID: <CE2A65CAAFE55048BA6682475F9A7DBF5EA6E601B9@ACLMAIL01.corp.audiocodes.com>
References: <CE2A65CAAFE55048BA6682475F9A7DBF5EA6E59A16@ACLMAIL01.corp.audiocodes.com> <4AF81CFF.8010803@extendedsubset.com>, <4AF86EDF.3090004@jacaranda.org>
In-Reply-To: <4AF86EDF.3090004@jacaranda.org>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Subject: Re: [TLS] draft-rescorla-tls-renegotiate and MITM resistance
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.9
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/listinfo/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: Mon, 09 Nov 2009 19:46:47 -0000
David-Sarah Hopwood wrote: >Marsh Ray wrote: >> Yair Elharrar wrote: >>> In addition, until such time that all clients in the world start >>> supporting this extension (e.g. kiosks in airports), servers will >>> have to support backward compatibility. >> >> It will be a trade-off for each server admin to weigh and decide their >> policy. I suspect many admins will prefer not to allow insecure >> connections from unpatched airport kiosks. > > To prevent this attack, they don't have to disallow connections, only > renegotiations in which the extension is not used. > That's a very good point. Perhaps the draft could be changed to reflect that? I can't see any reason why an airport kiosk would need to renegotiate an HTTPS connection (these devices rarely have client certificates installed); however it should be allowed to connect to secure web sites. Yair -- This email and any files transmitted with it are confidential material. They are intended solely for the use of the designated individual or entity to whom they are addressed. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, use, distribution or copying of this communication is strictly prohibited and may be unlawful. If you have received this email in error please immediately notify the sender and delete or destroy any copy of this message
- [TLS] draft-rescorla-tls-renegotiate and MITM res… Yair Elharrar
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yoav Nir
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yoav Nir
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Dr Stephen Henson
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yair Elharrar
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yoav Nir
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Nicolas Williams
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… David-Sarah Hopwood
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… David-Sarah Hopwood
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yair Elharrar
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yngve N. Pettersen (Developer Opera Software ASA)
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yoav Nir
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Nicolas Williams
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… David-Sarah Hopwood
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Michael D'Errico
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Nicolas Williams
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Nicolas Williams
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Steve Dispensa
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… David-Sarah Hopwood
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Peter Saint-Andre
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Marsh Ray
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Yoav Nir
- Re: [TLS] To API or not Bill Frantz
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Michael D'Errico
- Re: [TLS] draft-rescorla-tls-renegotiate and MITM… Martin Rex
- [TLS] RC4+3DES rekeying - long-lived TLS connecti… Martin Rex
- Re: [TLS] RC4+3DES rekeying - long-lived TLS conn… David-Sarah Hopwood
- Re: [TLS] RC4+3DES rekeying - long-lived TLS conn… Peter Saint-Andre