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Re: [hybi] workability (or otherwise) of HTTP upgrade

Willy Tarreau <w@1wt.eu> Wed, 01 December 2010 18:56 UTC

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Date: Wed, 01 Dec 2010 19:57:59 +0100
From: Willy Tarreau <w@1wt.eu>
To: John Tamplin <jat@google.com>
Message-ID: <20101201185759.GI19021@1wt.eu>
References: <AANLkTin6=8_Bhn2YseoSHGh1OSkQzsYrTW=fMiPvYps1@mail.gmail.com> <20101126000352.ad396b9a.eric@bisonsystems.net> <AANLkTimzQyG4hugOvHqoNrBrZFA4fGbGXQ7MZ2i+68dO@mail.gmail.com> <4CF615B2.9010304@rowe-clan.net> <F96E5CE9-CA7D-4B70-8260-F05456D021FB@gbiv.com> <AANLkTimi5HL56PD9gLHUWs=mcbV3Eaz=GOsK38sxPevb@mail.gmail.com> <AANLkTimydOwRiVkrZn0zmxmvWP_V6yAmNbipOF73NBWD@mail.gmail.com> <AANLkTin_k_s7yOSP1QUXyy66p=gweeepySFG+C=kGYJ+@mail.gmail.com> <AANLkTim9jj0pZzNjrJ+rTXd6ZYnp284ugcKXALcj-Wt6@mail.gmail.com> <AANLkTinb4pDS25HJwnM36NK9ajyEt8MztWriR5ECEgZR@mail.gmail.com>
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Cc: "William A. Rowe Jr." <wrowe@rowe-clan.net>, "Roy T. Fielding" <fielding@gbiv.com>, Hybi HTTP <hybi@ietf.org>
Subject: Re: [hybi] workability (or otherwise) of HTTP upgrade
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On Wed, Dec 01, 2010 at 01:52:14PM -0500, John Tamplin wrote:
> On Wed, Dec 1, 2010 at 1:47 PM, Greg Wilkins <gregw@webtide.com> wrote:
> > If 6543 is the websocket port, then it would not matter in an
> > intermediary intercepted and interpreted
> >
> >  CONNECT some.host.com:6543 HTTP/1.1
> >
> > as the implementation of that is likely to be exactly the semantics
> > that we want.
> >
> >
> > An intermediary that incepts and interpets
> >
> >  CONNECT some.special.token HTTP/1.1
> >
> > is going to break.
> 
> Breaking in a way that doesn't expose a vulnerability is fine (but
> obviously we would prefer to avoid it), as those will eventually be
> upgraded to be WebSocket-aware -- what we definitely can't afford is
> an intermediary that breaks in such a way as to expose
> vulnerabilities, which is what Adam's work on GET+Upgrade appears to
> show.

That's why I'm insisting that we ensure that what we put there either
always breaks or that we put the real name+port, but not some randomly
defined entity that we decide must not be resolved until someone finds
it useful to resolve it.

Willy

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