Re: [TLS] no_renegotiation alert and SSLV3

Martin Rex <mrex@sap.com> Tue, 22 December 2009 14:29 UTC

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From: Martin Rex <mrex@sap.com>
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Date: Tue, 22 Dec 2009 15:29:18 +0100 (MET)
In-Reply-To: <200912221357.nBMDv6cb008354@fs4113.wdf.sap.corp> from "Martin Rex" at Dec 22, 9 02:57:05 pm
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Cc: rdugal@certicom.com, tls@ietf.org
Subject: Re: [TLS] no_renegotiation alert and SSLV3
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Martin Rex wrote:
> 
> Robert Dugal wrote:
> > 
> > I am wondering what to do for section 6.2 of
> > draft-ietf-tls-renegotiation-02.txt when SSLv3 is negotiated and RI/SCSV
> > was not in the ClientHello.   
> > 
> > The no_renegotiation alert was not defined in SSLv3. 
> 
> If you want to abort the handshake, you could send a fatal handshake alert.

I meant fatal handshake_failure(40) alert.

> 
> I admit to have no relevant implementation experience in that
> area, but if your objective is to permit the client to continue
> without renegotiation, I would try the pragmatic approach and
> send the no_renegotation alert with warning level anyway.
> 
> This could work at least for those clients that are merely configured
> to use SSLv3 and not _limited_ to SSLv3.
 
-Martin