Re: [TLS] Verifying X.509 Certificate Chains out of order

pgut001@cs.auckland.ac.nz (Peter Gutmann) Tue, 07 October 2008 14:14 UTC

Return-Path: <tls-bounces@ietf.org>
X-Original-To: tls-archive@ietf.org
Delivered-To: ietfarch-tls-archive@core3.amsl.com
Received: from [127.0.0.1] (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id CFE983A6B28; Tue, 7 Oct 2008 07:14:47 -0700 (PDT)
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 1A9323A6B28 for <tls@core3.amsl.com>; Tue, 7 Oct 2008 07:14:46 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.956
X-Spam-Level:
X-Spam-Status: No, score=-5.956 tagged_above=-999 required=5 tests=[AWL=0.643, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
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 U1BGuSBk3qnQ for <tls@core3.amsl.com>; Tue, 7 Oct 2008 07:14:45 -0700 (PDT)
Received: from mailhost.auckland.ac.nz (larry.its.auckland.ac.nz [130.216.12.34]) by core3.amsl.com (Postfix) with ESMTP id 3CC963A67AB for <tls@ietf.org>; Tue, 7 Oct 2008 07:14:44 -0700 (PDT)
Received: from localhost (localhost.localdomain [127.0.0.1]) by mailhost.auckland.ac.nz (Postfix) with ESMTP id EDF9519748; Wed, 8 Oct 2008 03:14:21 +1300 (NZDT)
X-Virus-Scanned: by amavisd-new at mailhost.auckland.ac.nz
Received: from mailhost.auckland.ac.nz ([127.0.0.1]) by localhost (larry.its.auckland.ac.nz [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EkNlyFLejpZd; Wed, 8 Oct 2008 03:14:21 +1300 (NZDT)
Received: from iris.cs.auckland.ac.nz (iris.cs.auckland.ac.nz [130.216.33.152]) by mailhost.auckland.ac.nz (Postfix) with ESMTP id D39D7196F4; Wed, 8 Oct 2008 03:14:21 +1300 (NZDT)
Received: from wintermute01.cs.auckland.ac.nz (wintermute01.cs.auckland.ac.nz [130.216.34.38]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by iris.cs.auckland.ac.nz (Postfix) with ESMTP id E208A19EC0BA; Wed, 8 Oct 2008 03:14:19 +1300 (NZDT)
Received: from pgut001 by wintermute01.cs.auckland.ac.nz with local (Exim 4.63) (envelope-from <pgut001@wintermute01.cs.auckland.ac.nz>) id 1KnDKN-0005hN-Q8; Wed, 08 Oct 2008 03:14:19 +1300
From: pgut001@cs.auckland.ac.nz (Peter Gutmann)
To: martin.rex@sap.com
In-Reply-To: <200810071409.m97E9GBd024151@fs4113.wdf.sap.corp>
Message-Id: <E1KnDKN-0005hN-Q8@wintermute01.cs.auckland.ac.nz>
Date: Wed, 08 Oct 2008 03:14:19 +1300
Cc: tls@ietf.org
Subject: Re: [TLS] Verifying X.509 Certificate Chains out of order
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-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>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: tls-bounces@ietf.org
Errors-To: tls-bounces@ietf.org

Martin Rex <Martin.Rex@sap.com>; writes:

>Would a zero-length ASN.1 SEQUENCE not require that DistinguishedName have a
>zero length?

A zero-length BER encoding of a SEQUENCE would be 30 81 00, which meets the
minimum-length requirements of 3 bytes.

(I'd always assumed that the limit of 3 bytes was specifically to allow this
encoding of an empty DN, since it's not possible to get a DN that fits into 3
bytes).

Peter.
_______________________________________________
TLS mailing list
TLS@ietf.org
https://www.ietf.org/mailman/listinfo/tls