IETF Logo Mail Archive

[TLS] TLS Flags and IANA registration policy

Hannes Tschofenig <Hannes.Tschofenig@arm.com> Sat, 23 October 2021 08:47 UTC

Return-Path: <Hannes.Tschofenig@arm.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 2F00E3A0967 for <tls@ietfa.amsl.com>; Sat, 23 Oct 2021 01:47:23 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.899
X-Spam-Level:
X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=armh.onmicrosoft.com header.b=XhA8xamr; dkim=pass (1024-bit key) header.d=armh.onmicrosoft.com header.b=XhA8xamr
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 zCGNRhLZJkad for <tls@ietfa.amsl.com>; Sat, 23 Oct 2021 01:47:18 -0700 (PDT)
Received: from EUR02-HE1-obe.outbound.protection.outlook.com (mail-eopbgr10049.outbound.protection.outlook.com [40.107.1.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1578B3A08CD for <tls@ietf.org>; Sat, 23 Oct 2021 01:47:18 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=IaEJUkHjYeleWTrM3nQV/uwgXA7hRZlccZTgOg87Nvo=; b=XhA8xamrEq8k1VKVoA/s0zHWBhocy6aq5XkUlV+rowlBpK/otJn3MWXW2SL81EgkKl0FQeumF4JGLAgso2TYpuPt7E/UaegMyZY0Mx81rEfnttjbtHnOM9Rsr5/9CmNOjTueWAAFG1rq3bjkApL6BU6N9gyAzGbmVdPyaMrvIgw=
Received: from DU2PR04CA0234.eurprd04.prod.outlook.com (2603:10a6:10:2b1::29) by AM7PR08MB5511.eurprd08.prod.outlook.com (2603:10a6:20b:10d::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4628.18; Sat, 23 Oct 2021 08:47:05 +0000
Received: from DB5EUR03FT042.eop-EUR03.prod.protection.outlook.com (2603:10a6:10:2b1:cafe::f0) by DU2PR04CA0234.outlook.office365.com (2603:10a6:10:2b1::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4628.18 via Frontend Transport; Sat, 23 Oct 2021 08:47:05 +0000
X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 63.35.35.123) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com;dmarc=pass action=none header.from=arm.com;
Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com;
Received: from 64aa7808-outbound-1.mta.getcheckrecipient.com (63.35.35.123) by DB5EUR03FT042.mail.protection.outlook.com (10.152.21.123) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4628.18 via Frontend Transport; Sat, 23 Oct 2021 08:47:04 +0000
Received: ("Tessian outbound 2e7020cc8961:v103"); Sat, 23 Oct 2021 08:47:04 +0000
X-CR-MTA-TID: 64aa7808
Received: from d083633413c1.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id 4F44D64A-37CE-4D1C-8338-D916B098121B.1; Sat, 23 Oct 2021 08:46:58 +0000
Received: from EUR05-VI1-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id d083633413c1.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Sat, 23 Oct 2021 08:46:58 +0000
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=n/S7aCq0ud4tQJufkf6VVd5QZ0fj8igCOxlbJE5Qq3c+/eAG9Zr9ANa+wGiqyNof+iD3iZfdsVR08sgu8QukNcesF0ySG3vbZPBYegQvJBl2c6I5AuwCOaDPZ6RSsKic7o4pLn4P3crLUJ9PquxeE+zC1y8RDb+kTB/lPPQV53GL3C2c800mmo1A1ilMg4XEp20ipGuhREDz6qVzsSsY+LdH/kV+3S/tTNf+b3U6RkcaYmo2uHhcOfAXX9M8qN23I7SATt96OPpIGaeXp3BUz+L/vxPbrqhmfATyAhHpmCmiTPy4DxavcTXSxeujtrFv+eAXgler6Y+IelqkWXxlpw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=IaEJUkHjYeleWTrM3nQV/uwgXA7hRZlccZTgOg87Nvo=; b=jlRGTatiSu9dheetbeDm6dA8L8xoznYqRAZL4QLwZZjSJynwqVzcutsqWAjRVYPu1567MOdQt8rpJ19PK+RrcNWZIeeOOneBgrUDTTF01luaMGbGixjzsuABhzTKaH9yqEVtLercwnOy1vSKbSBqbJavj5r74Tgxe2fv0w6LGNQmvGblweSXZU8XC6HjNMAIkTulohRKEb7W9rPj3BTC0+H7EZYesqsoudD74cpXM3UxRHckWqOa69kwUTGraqkHxtDtaXrmAkfSJFjqySImCf7e8RJP+FBSRU/JbP9dnznr4UlKjkpDMmbechjJS/xHgHg65FlBcsAqyjrhVQJzxA==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=IaEJUkHjYeleWTrM3nQV/uwgXA7hRZlccZTgOg87Nvo=; b=XhA8xamrEq8k1VKVoA/s0zHWBhocy6aq5XkUlV+rowlBpK/otJn3MWXW2SL81EgkKl0FQeumF4JGLAgso2TYpuPt7E/UaegMyZY0Mx81rEfnttjbtHnOM9Rsr5/9CmNOjTueWAAFG1rq3bjkApL6BU6N9gyAzGbmVdPyaMrvIgw=
Received: from DBBPR08MB5915.eurprd08.prod.outlook.com (2603:10a6:10:20d::17) by DB8PR08MB4107.eurprd08.prod.outlook.com (2603:10a6:10:ac::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4628.18; Sat, 23 Oct 2021 08:46:56 +0000
Received: from DBBPR08MB5915.eurprd08.prod.outlook.com ([fe80::4514:95de:c5e0:ddbe]) by DBBPR08MB5915.eurprd08.prod.outlook.com ([fe80::4514:95de:c5e0:ddbe%8]) with mapi id 15.20.4628.018; Sat, 23 Oct 2021 08:46:56 +0000
From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: IETF TLS <tls@ietf.org>
Thread-Topic: TLS Flags and IANA registration policy
Thread-Index: AdfH6hTsEun8gN1RQLyNLwkSDKDU2g==
Date: Sat, 23 Oct 2021 08:46:56 +0000
Message-ID: <DBBPR08MB59153B444624CEA8EC6E9A66FA819@DBBPR08MB5915.eurprd08.prod.outlook.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ts-tracking-id: 2CCD16F53002904FB3C301F86842DE4C.0
x-checkrecipientchecked: true
Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com;
x-ms-publictraffictype: Email
X-MS-Office365-Filtering-Correlation-Id: a49a640f-cf99-422c-f5e8-08d99601b030
x-ms-traffictypediagnostic: DB8PR08MB4107:|AM7PR08MB5511:
X-Microsoft-Antispam-PRVS: <AM7PR08MB5511B3ABFD9C374E0FD5176FFA819@AM7PR08MB5511.eurprd08.prod.outlook.com>
x-checkrecipientrouted: true
nodisclaimer: true
x-ms-oob-tlc-oobclassifiers: OLM:6430;OLM:9508;
X-MS-Exchange-SenderADCheck: 1
X-MS-Exchange-AntiSpam-Relay: 0
X-Microsoft-Antispam-Untrusted: BCL:0;
X-Microsoft-Antispam-Message-Info-Original: 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
X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DBBPR08MB5915.eurprd08.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(9686003)(5660300002)(76116006)(7696005)(316002)(6506007)(66946007)(508600001)(8676002)(71200400001)(64756008)(26005)(186003)(166002)(38100700002)(4744005)(66446008)(966005)(33656002)(55016002)(38070700005)(6916009)(122000001)(8936002)(66556008)(86362001)(66476007)(83380400001)(2906002)(52536014); DIR:OUT; SFP:1101;
Content-Type: multipart/alternative; boundary="_000_DBBPR08MB59153B444624CEA8EC6E9A66FA819DBBPR08MB5915eurp_"
MIME-Version: 1.0
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR08MB4107
Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com;
X-EOPAttributedMessage: 0
X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5EUR03FT042.eop-EUR03.prod.protection.outlook.com
X-MS-Office365-Filtering-Correlation-Id-Prvs: 49c14f16-28fd-4469-3355-08d99601ab8d
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-Forefront-Antispam-Report: CIP:63.35.35.123; CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(46966006)(36840700001)(83380400001)(508600001)(52536014)(186003)(356005)(336012)(6506007)(26005)(166002)(966005)(8936002)(8676002)(36860700001)(9686003)(70586007)(6916009)(81166007)(55016002)(2906002)(316002)(7696005)(33656002)(82310400003)(47076005)(86362001)(5660300002)(70206006); DIR:OUT; SFP:1101;
X-OriginatorOrg: arm.com
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2021 08:47:04.4698 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: a49a640f-cf99-422c-f5e8-08d99601b030
X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com]
X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT042.eop-EUR03.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR08MB5511
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/L8wJL9z-tPwp3VxZWNYY94LqJbA>
Subject: [TLS] TLS Flags and IANA registration policy
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.29
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: Sat, 23 Oct 2021 08:47:23 -0000

Hi all,

https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags gives guidance on registering values in the TLS Flags namespace.

One of the field is the "Recommended" field and it is described as follows:

"
o  Recommended, which is a Y/N value determined in the document defining the optional feature.
"

What does this mean? When do I use a "Y" and when a "N"? What is the implication of declaring it as a "N"?

Ciao
Hannes

IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

v2.23.0 | Report a Bug | By Email