Re: [quicwg/base-drafts] Add retry integrity tag (#3120)

Christian Huitema <notifications@github.com> Fri, 15 November 2019 06:50 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B42A81200F4 for <quic-issues@ietfa.amsl.com>; Thu, 14 Nov 2019 22:50:35 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.596
X-Spam-Level:
X-Spam-Status: No, score=-6.596 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_IMAGE_ONLY_28=1.404, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
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 ZYJ2unhgDw0R for <quic-issues@ietfa.amsl.com>; Thu, 14 Nov 2019 22:50:34 -0800 (PST)
Received: from out-5.smtp.github.com (out-5.smtp.github.com [192.30.252.196]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DF9B7120103 for <quic-issues@ietf.org>; Thu, 14 Nov 2019 22:50:33 -0800 (PST)
Received: from github-lowworker-d31a065.va3-iad.github.net (github-lowworker-d31a065.va3-iad.github.net [10.48.17.70]) by smtp.github.com (Postfix) with ESMTP id 3DF9E960508 for <quic-issues@ietf.org>; Thu, 14 Nov 2019 22:50:33 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1573800633; bh=dD5luGIr6p4nGPKdjlckC32dt9NmvognLXlxHT5scw8=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=SIb77BM/FVz3kah0aOO6QERQh5Wb3H7LpsB8EaU0HN5KAySG/KO5RIxDyBWq/OHMO qz+sS+sAg5T62l0puh3DrVpa44JrKpxa8eQ+TgrvHOwJGiHv0xScFDlnS1YdrvMaHl rVMyl+lvYcaigNO9DBgVnkIjFNHIz1pH8az1Sn98=
Date: Thu, 14 Nov 2019 22:50:33 -0800
From: Christian Huitema <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK27E663LQHGOK52CIN33N6TTEVBNHHB4UZE54@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/pull/3120/review/317433635@github.com>
In-Reply-To: <quicwg/base-drafts/pull/3120@github.com>
References: <quicwg/base-drafts/pull/3120@github.com>
Subject: Re: [quicwg/base-drafts] Add retry integrity tag (#3120)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5dce4ab92ef72_29703fa03e6cd9646763dc"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: huitema
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/T8lK4jF4C1TuEbJCs5xNWVZ6bXg>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 15 Nov 2019 06:50:36 -0000

huitema commented on this pull request.



> +The Retry Pseudo-Packet is not sent over the wire. It is computed by taking
+the transmitted Retry packet, removing the Retry Integrity Tag and prepending
+the two following fields:
+
+ODCID Len:
+
+: The ODCID Len contains the length in bytes of the Original Destination
+  Connection ID field that follows it, encoded as an 8-bit unsigned integer.
+
+Original Destination Connection ID:
+
+: The Original Destination Connection ID contains the value of the Destination
+  Connection ID from the Initial packet that this Retry is in response to. The
+  length of this field is given in ODCID Len. The presence of this field
+  mitigates an off-path attacker's ability to inject a Retry packet.
+

But I would shut up if you replaced "mitigates" by "diminishes".

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/pull/3120#discussion_r346681472