Re: [quicwg/base-drafts] Migration with zero-length CID is inadvisable (#3563)

Martin Thomson <notifications@github.com> Thu, 30 April 2020 00:57 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 A23003A0BF2 for <quic-issues@ietfa.amsl.com>; Wed, 29 Apr 2020 17:57:49 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.302
X-Spam-Level:
X-Spam-Status: No, score=-2.302 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, DKIM_VALID_EF=-0.1, HTML_IMAGE_ONLY_24=1.618, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_MSPIKE_H2=-0.82, 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 6rJfROw8Q-ZG for <quic-issues@ietfa.amsl.com>; Wed, 29 Apr 2020 17:57:47 -0700 (PDT)
Received: from out-22.smtp.github.com (out-22.smtp.github.com [192.30.252.205]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A41313A0BF0 for <quic-issues@ietf.org>; Wed, 29 Apr 2020 17:57:47 -0700 (PDT)
Received: from github-lowworker-ca235ff.ash1-iad.github.net (github-lowworker-ca235ff.ash1-iad.github.net [10.56.110.15]) by smtp.github.com (Postfix) with ESMTP id 46C1CA11BF for <quic-issues@ietf.org>; Wed, 29 Apr 2020 17:57:46 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1588208266; bh=bTWzhBFNHVxn/PiOq6FHIwBgb4lvN81/s1860k9fcOs=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=wllW74m2+X/G1brgoNoHo8rGAgdIEXNJ19+7QDtFsa1aahlgRJDtBjvVvsM5ttCUg WW0nQA6RNRpfBokGHeSvY9wKCHqWEuR4r5LwhDaoB4+GXUwTK1MpQHFGaS1x8/lyy5 QaCJc6kYMbRmQbRwkYKbrwS9oXePKXBPY/FmFM90=
Date: Wed, 29 Apr 2020 17:57:46 -0700
From: Martin Thomson <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+AFTOJK7Z7HQVJQN2JMEZXW54WYBYVEVBNHHCGQM7OQ@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/pull/3563/review/403137880@github.com>
In-Reply-To: <quicwg/base-drafts/pull/3563@github.com>
References: <quicwg/base-drafts/pull/3563@github.com>
Subject: Re: [quicwg/base-drafts] Migration with zero-length CID is inadvisable (#3563)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5eaa228a37110_1fee3f8c3c4cd96810052b"; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: martinthomson
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/71lO2JtHsIIMnu7v1FqL900QmLE>
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: Thu, 30 Apr 2020 00:57:50 -0000

@martinthomson commented on this pull request.



> @@ -2246,6 +2246,16 @@ that packet numbers cannot be used to correlate activity.  This does not prevent
 other properties of packets, such as timing and size, from being used to
 correlate activity.
 
+An endpoint SHOULD NOT initiate migration with a peer that uses a zero-length
+connection ID, because traffic over the new path might be trivially linkable to
+traffic over the old one. If the server is able to route packets with a
+zero-length connection ID to the right connection, it means that the server is
+using other information to demultiplex packets. For example, the server can
+assign an address that is unique to the connection using the preferred_address
+transport parameter; see {{preferred-address}}.  Information that might allow

Good catch.  These were done in parallel without thinking much about their interactions.  I've switched to using a different example.

-- 
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/3563#discussion_r417696916