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

Sean Turner <turners@ieca.com> Tue, 14 September 2010 14:54 UTC

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Date: Tue, 14 Sep 2010 10:54:51 -0400
From: Sean Turner <turners@ieca.com>
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Cc: tls@ietf.org
Subject: Re: [TLS] Accept draft-turner-ssl-must-not-02 as WG item
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Michael D'Errico wrote:
> Eric Rescorla wrote:
>> In Maastricht, we saw a presentation on draft-turner-ssl-must-not:
>>
>> http://tools.ietf.org/html/draft-turner-ssl-must-not-02
>>
>> The consensus in Maastricht was to adopt this as a WG item. If anyone 
>> objects please speak up now.
> 
> No objection to taking it on as a WG item, but I do have a concern
> with section 3:
> 
>    3. Changes to TLS
>       [...]
>        o TLS servers MUST NOT accept SSL 2.0 ClientHello messages.
> 
> I still see many SSLv2 ClientHellos, and none of them are SSLv2-only
> clients.  So at this point in time I think MUST NOT is too strong on
> the server side.  I don't think using an SSLv2 hello is a security
> problem since it supports the TLS_EMPTY_RENEGOTIATION_INFO_SCSV
> cipher suite value.

Unless anybody else objects I'll make the following swap:

OLD:

o TLS servers MUST NOT accept SSL 2.0 ClientHello messages.

NEW:

o TLS servers SHOULD NOT accept SSL 2.0 ClientHello messages.

spt

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