Re: [hybi] workability (or otherwise) of HTTP upgrade
Mark Nottingham <mnot@mnot.net> Mon, 06 December 2010 23:16 UTC
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From: Mark Nottingham <mnot@mnot.net>
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To: Adam Barth <ietf@adambarth.com>
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Cc: hybi <hybi@ietf.org>, HTTP Working Group <ietf-http-wg@w3.org>
Subject: Re: [hybi] workability (or otherwise) of HTTP upgrade
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Adam -- It seems to me we can't really make any progress until we see that the assertion in your first sentence is true; it's certainly possible to construct an insecure use of Upgrade, but that doesn't prove that it's impossible to use it securely. Any chance of getting that report? Regards, On 26/11/2010, at 5:54 PM, Adam Barth wrote: > Using Upgrade for WebSockets is insecure in practice. My colleagues > and I have run an experiment using live traffic on the Internet and > have successfully exploited a number of users using an Upgrade-based > handshake (our exploit is harmless by proves the concept). I'm still > getting clearance from some affected vendors before releasing a report > on the experiment publicly. It's looking like I'll be able to release > the report within a week. > > Upgrade might well be useful for other purposes, and I think > definition in HTTP is fine. The problem is that not everyone > implements Upgrade properly, which leaves room for an attack to > leverage an Upgrade-based WebSockets handshake in attacks. > > Kind regards, > Adam > > > On Thu, Nov 25, 2010 at 9:06 PM, Greg Wilkins <gregw@webtide.com> wrote: >> I'm cross posting this message to both the hybi (websockets) and >> http-bis mailing list as I think this is an issue that is very >> relevant to both groups. >> >> The hybi/websocket protocol, as currently proposed, has a handshake >> mechanism that is roughly based on the HTTP upgrade mechanism. >> Progress in the hybi/websocket mailing has ground to a halt because we >> appear unable to get a clear consensus between the two advocated ways >> forward: >> >> 1) Make the "roughly based" HTTP upgrade mechanism a fully compliant >> HTTP upgrade. >> 2) Move away from HTTP upgrade and use another mechanism (potentially >> CONNECT or SSL extensions) >> >> To paraphrase the arguments against 1), there are some that are >> concerned that an Upgrade based handshake will never be able to be >> adequately secured against cross protocol attacks from ws-browsers to >> non ws-servers. Also there is some concern that intermediaries might >> not well support Upgrade and that other mechanisms might have a higher >> success rate. >> >> So I thought that it would be good to move that discussion from hybi >> to HTTP-bis so we can stall progress here.... no I mean so that we can >> get a wider view on the capabilities and vulnerabilities that might >> apply to Upgrade. >> >> My understanding is that Upgrade was included in HTTP for precisely >> the reason that Websocket wishes to use it - ie to take an existing >> HTTP connection and to upgrade the protocol run over the connection to >> something with different capabilities than HTTP. >> I would also expect that if there are problems with lack of Upgrade >> support in intermediaries, then it would be easier to get >> intermediaries to be updated to a standard generic HTTP mechanism >> rather than some special purpose usage of CONNECT. >> >> If websocket is unable to securely use Upgrade, then there must be >> some fundamental flaw in Upgrade that should either be fixed in >> httpbis (if allowed by the charter). If Upgrade cannot be fixed, >> then perhaps httpbis needs to somehow deprecate the mechanism and we >> can look together for alternatives? >> >> So I'd ask the httpbis readers, are there any reasons you know of that >> would prevent Upgrade being used for websocket? >> And I'd ask the hybi upgrade sceptics if they could perhaps voice >> their concerns about Upgrade in more detail than my paraphrasing >> above. >> >> regards >> _______________________________________________ >> hybi mailing list >> hybi@ietf.org >> https://www.ietf.org/mailman/listinfo/hybi >> > -- Mark Nottingham http://www.mnot.net/
- [hybi] workability (or otherwise) of HTTP upgrade Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Adam Barth
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Julian Reschke
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Julian Reschke
- Re: [hybi] workability (or otherwise) of HTTP upg… Jamie Lokier
- Re: [hybi] workability (or otherwise) of HTTP upg… William A. Rowe Jr.
- Re: [hybi] workability (or otherwise) of HTTP upg… William A. Rowe Jr.
- Re: [hybi] workability (or otherwise) of HTTP upg… Roy T. Fielding
- Re: [hybi] workability (or otherwise) of HTTP upg… Adam Barth
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Eric Rescorla
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Eric Rescorla
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Roy T. Fielding
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Adam Barth
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Adrien de Croy
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Dave Cridland
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Joe Mason
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… William A. Rowe Jr.
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Adam Barth
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Brian McKelvey
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Bjoern Hoehrmann
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Bjoern Hoehrmann
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Jack Moffitt
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… Maciej Stachowiak
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Adrien de Croy
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Collin Jackson
- Re: [hybi] workability (or otherwise) of HTTP upg… Mark Nottingham
- Re: [hybi] workability (or otherwise) of HTTP upg… SM
- Re: [hybi] workability (or otherwise) of HTTP upg… Pat McManus @Mozilla
- Re: [hybi] workability (or otherwise) of HTTP upg… Scott Ferguson
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Gabriel Montenegro
- Re: [hybi] workability (or otherwise) of HTTP upg… Simon Pieters
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Simon Pieters
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… John Tamplin
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Bjoern Hoehrmann
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Bjoern Hoehrmann
- Re: [hybi] workability (or otherwise) of HTTP upg… Greg Wilkins
- Re: [hybi] workability (or otherwise) of HTTP upg… Martin J. Dürst
- Re: [hybi] workability (or otherwise) of HTTP upg… Willy Tarreau
- Re: [hybi] workability (or otherwise) of HTTP upg… Simon Pieters
- Re: [hybi] workability (or otherwise) of HTTP upg… James Graham
- Re: [hybi] workability (or otherwise) of HTTP upg… Michael
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu
- Re: [hybi] workability (or otherwise) of HTTP upg… Zhong Yu