Re: [TLS] DNS-based Encrypted SNI

Patrick McManus <pmcmanus@mozilla.com> Tue, 03 July 2018 15:26 UTC

Return-Path: <pmcmanus@mozilla.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 401D8130EA8 for <tls@ietfa.amsl.com>; Tue, 3 Jul 2018 08:26:54 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.234
X-Spam-Level:
X-Spam-Status: No, score=-1.234 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_SOFTFAIL=0.665] autolearn=no autolearn_force=no
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 JNroRWNs5wNu for <tls@ietfa.amsl.com>; Tue, 3 Jul 2018 08:26:52 -0700 (PDT)
Received: from linode64.ducksong.com (linode6only.ducksong.com [IPv6:2600:3c02::f03c:91ff:fe6e:e8da]) by ietfa.amsl.com (Postfix) with ESMTP id D8D50130E52 for <tls@ietf.org>; Tue, 3 Jul 2018 08:26:52 -0700 (PDT)
Received: from mail-oi0-f44.google.com (mail-oi0-f44.google.com [209.85.218.44]) by linode64.ducksong.com (Postfix) with ESMTPSA id 86F263A05E for <tls@ietf.org>; Tue, 3 Jul 2018 11:26:52 -0400 (EDT)
Received: by mail-oi0-f44.google.com with SMTP id r16-v6so4616345oie.3 for <tls@ietf.org>; Tue, 03 Jul 2018 08:26:52 -0700 (PDT)
X-Gm-Message-State: APt69E3FXVfv6R63WWdYhO+xeAKehYsw3tmVYGsf47X8f6G+v2sivmxt pWBMoeuUaV8aXdC9UhMA+QQn7vTM/Mnh+cERwXU=
X-Google-Smtp-Source: AAOMgpfAR6VYJ0+4/nd8U9P90v03l8KnCwzSYiqeFFD+ltRQs0LiuoddYWa4XPrhX8srF9btH+VCSH+NqJ3gXGtdMT8=
X-Received: by 2002:aca:e7c8:: with SMTP id e191-v6mr19769086oih.132.1530631612244; Tue, 03 Jul 2018 08:26:52 -0700 (PDT)
MIME-Version: 1.0
Received: by 2002:a4a:8a22:0:0:0:0:0 with HTTP; Tue, 3 Jul 2018 08:26:51 -0700 (PDT)
In-Reply-To: <CAHbrMsCaYHgoBX6__m9qCPqJ1pbZ0JDPehHdvc8p51_gS7o8Yw@mail.gmail.com>
References: <CABcZeBMR=5QQjSS68H2mQoyG1cHVa5+Z_5SH0Md07kTBVSr3Sw@mail.gmail.com> <CAHbrMsCaYHgoBX6__m9qCPqJ1pbZ0JDPehHdvc8p51_gS7o8Yw@mail.gmail.com>
From: Patrick McManus <pmcmanus@mozilla.com>
Date: Tue, 3 Jul 2018 11:26:51 -0400
X-Gmail-Original-Message-ID: <CAOdDvNrk02EwFLi2gMTUGxa+kL6Q7+=nSC1XHzjTO8q5Ou3+GA@mail.gmail.com>
Message-ID: <CAOdDvNrk02EwFLi2gMTUGxa+kL6Q7+=nSC1XHzjTO8q5Ou3+GA@mail.gmail.com>
To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
Cc: Eric Rescorla <ekr@rtfm.com>, "<tls@ietf.org>" <tls@ietf.org>
Content-Type: multipart/alternative; boundary="00000000000087b732057019f15f"
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/zZMKKmj3bY41kq1b1duAo4pcGic>
Subject: Re: [TLS] DNS-based Encrypted SNI
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.26
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: Tue, 03 Jul 2018 15:26:55 -0000

On Tue, Jul 3, 2018 at 11:20 AM, Ben Schwartz <
bemasc=40google.com@dmarc.ietf.org>; wrote:

>
> One concern I've heard many times is that we can't add non-A/AAAA queries
> to a browser's critical path because there are middleboxes and buggy
> recursives that will just drop them, leading to a DNS timeout delay on
> every new socket.  However, for encrypted SNI I think we can ignore this by
> focusing on clients with DPRIVE or DOH enabled, which should avoid these
> kinds of problems.
>
>
yes, and of course encrypting sni is a lot more valuable when the dns query
is also encrypted.