Return-Path: X-Original-To: pkix@ietfa.amsl.com Delivered-To: pkix@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C74E21ACCD9 for ; Mon, 30 Mar 2015 12:10:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.601 X-Spam-Level: X-Spam-Status: No, score=-2.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_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 FuetWpWBmvas for ; Mon, 30 Mar 2015 12:10:10 -0700 (PDT) Received: from mxout-08.mxes.net (mxout-08.mxes.net [216.86.168.183]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E940E1ACC86 for ; Mon, 30 Mar 2015 12:10:09 -0700 (PDT) Received: from [10.177.240.84] (unknown [63.92.241.249]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.mxes.net (Postfix) with ESMTPSA id 940CB509BE; Mon, 30 Mar 2015 15:10:06 -0400 (EDT) Content-Type: multipart/signed; boundary="Apple-Mail=_3D670D13-26FC-4B39-AA69-14C74A136194"; protocol="application/pkcs7-signature"; micalg=sha1 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Sean Leonard In-Reply-To: <74EB71CA-3E5F-4D93-9232-3F1AA7308D7B@gmail.com> Date: Mon, 30 Mar 2015 12:09:19 -0700 Message-Id: References: <9A043F3CF02CD34C8E74AC1594475C73AAFB6418@uxcn10-5.UoA.auckland.ac.nz> <5512C9C7.70202@comodo.com> <55159714.1070902@openca.org> <55190678.6080007@comodo.com> <924332F5-FED1-4A0C-BBD8-146C1AC549B3@vigilsec.com> <3161EB72-BE23-44CB-B02A-12648BAE73BB@vigilsec.com> <74EB71CA-3E5F-4D93-9232-3F1AA7308D7B@gmail.com> To: Yoav Nir X-Mailer: Apple Mail (2.1878.6) Archived-At: Cc: IETF PKIX , Paul Hoffman Subject: Re: [pkix] a question of cert (and OCSP) extension syntax X-BeenThere: pkix@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: PKIX Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Mar 2015 19:10:11 -0000 --Apple-Mail=_3D670D13-26FC-4B39-AA69-14C74A136194 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 On Mar 30, 2015, at 10:23 AM, Yoav Nir wrote: >=20 >> On Mar 30, 2015, at 6:46 PM, Russ Housley = wrote: >>=20 >> Paul: >>=20 >>>>> I think it's only "wrong" and "weird" if you take the view that = "if it could conceivably be constructed in ASN.1, then it MUST be = constructed in ASN.1". I don't take that view. >>>>=20 >>>> Certificates are ASN.1, and RFC 5280 (and its predecessors) say = that extensions are OCTET STRING wrapped ASN.1 structures. =46rom = section 4.2 of RFC 2459: >>>>=20 >>>> Each extension includes an OID and an ASN.1 structure. >>>=20 >>> I always interpreted the "an ASN.1 structure" there as meaning that = any structure was acceptable, whether it was SEQUENCE or INTEGER or = OCTET STRING or whatever. >>=20 >> The usage in this case is a non-ASN.1 structure shoved into an OCTET = STRING and then wrapped in an OCTET STRING. >=20 > That is not without precedent. A subject alternative name ([1]) of = type rfc822Name is required to be formatted according to section 4.1.2 = of RFC 2821, and that=92s not ASN-1 formatted. The counterpoint is that rfc822Names (e-mail addresses) are = human-readable and usually transmitted in that exact format, namely in = protocols where it has to be unpacked into local-part and domain = components, such as RFC 5322 (e-mail format) and RFC 5321 (SMTP), as = well as in prose text. The same logic applies to dNSNames. The sequence of data at issue here is not human-readable, certainly not = in the same way as those examples. 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