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Re: [hybi] I-D Action: draft-ietf-hybi-thewebsocketprotocol-09.txt

Julian Reschke <julian.reschke@gmx.de> Wed, 15 June 2011 09:20 UTC

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Date: Wed, 15 Jun 2011 11:20:16 +0200
From: Julian Reschke <julian.reschke@gmx.de>
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To: Simon Pieters <simonp@opera.com>
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Cc: "hybi@ietf.org" <hybi@ietf.org>, Gabriel Montenegro <Gabriel.Montenegro@microsoft.com>, Patrick McManus <pmcmanus@mozilla.com>
Subject: Re: [hybi] I-D Action: draft-ietf-hybi-thewebsocketprotocol-09.txt
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On 2011-06-15 11:16, Simon Pieters wrote:
> ...
>> There is a similar reaction to the -08+ requirement that (paraphrased)
>> non UTF-8 sequences are interpreted as U+FFFD. Silently rewriting the
>> data is frowned on from a security pov. We are considering just failing
>> such a non-conformant connection (and I suppose becoming non-conformant
>> ourselves by doing so.).
>
> Rewriting broken UTF-8 sequences to U+FFFD is done all over the Web
> platform (exception being XML although most browsers did it in XML too
> until it was tested in Acid3). Failing the connection here seems to make
> the protocol brittle. What's the security problem?
> ...

Failing the connections makes broken servers fail early. Sounds good to me.

Best regards, Julian

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