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Re: [TLS] Accept draft-turner-ssl-must-not-02 as WG item

Yoav Nir <ynir@checkpoint.com> Wed, 15 September 2010 10:21 UTC

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From: Yoav Nir <ynir@checkpoint.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Date: Wed, 15 Sep 2010 12:21:34 +0200
Thread-Topic: [TLS] Accept draft-turner-ssl-must-not-02 as WG item
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Subject: Re: [TLS] Accept draft-turner-ssl-must-not-02 as WG item
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On Sep 15, 2010, at 5:54 AM, Peter Gutmann wrote:

> Martin Rex <mrex@sap.com> writes:
> 
>> Personally I can not think of a reason to move away from what rfc-5246
>> appendix E.2 says.
> 
> I can.  That language has been in there more or less forever, and it's had
> pretty much zero effect in encouraging implementations to drop the SSLv2
> handshake (some implementations gradually have over time, but probably not
> because of text that says "well, you know, it would be really uncool if you
> kept sending SSLv2 hello's for the next twenty years").  Without a clear MUST
> NOT for the server to finally get clients to switch off SSLv2 hellos, we're
> never going to get rid of these things.

I disagree about "never". There is really just one client left "in the wild" that sends as SSLv2 ClientHello, and that client is 10 years old.

As XP-without-service-packs drifts into obscurity, the MUST NOT will become appropriate. For now, following the MUST NOT in HTTPS servers means that 20% of browsers won't connect.

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