Re: [TLS] PR#1091: Changes to provide middlebox robustness

Yuhong Bao <yuhongbao_386@hotmail.com> Fri, 24 November 2017 19:21 UTC

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From: Yuhong Bao <yuhongbao_386@hotmail.com>
To: Andrei Popov <Andrei.Popov@microsoft.com>, Peter Saint-Andre <stpeter@stpeter.im>, Eric Rescorla <ekr@rtfm.com>
CC: "tls@ietf.org" <tls@ietf.org>, Tapio Sokura <tapio.sokura@iki.fi>
Thread-Topic: [TLS] PR#1091: Changes to provide middlebox robustness
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Date: Fri, 24 Nov 2017 19:21:49 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/QRIYLk8vHguhILHo36HTjAzd7L8>
Subject: Re: [TLS] PR#1091: Changes to provide middlebox robustness
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That only applies to the ClientHello.

________________________________________
From: Andrei Popov <Andrei.Popov@microsoft.com>;
Sent: Wednesday, November 22, 2017 11:22:23 AM
To: Yuhong Bao; Peter Saint-Andre; Eric Rescorla
Cc: tls@ietf.org; Tapio Sokura
Subject: RE: [TLS] PR#1091: Changes to provide middlebox robustness

The idea was for the client to randomly add non-existent TLS versions to supported_versions.
Presumably, this will exercise the extensibility joint and prevent it from becoming unusable.

I'm not convinced this new approach will help, but we know the old one required fallbacks every time a new protocol version was introduced.

Cheers,

Andrei

-----Original Message-----
From: TLS [mailto:tls-bounces@ietf.org] On Behalf Of Yuhong Bao
Sent: Wednesday, November 22, 2017 11:04 AM
To: Peter Saint-Andre <stpeter@stpeter.im>;; Eric Rescorla <ekr@rtfm.com>;
Cc: tls@ietf.org; Tapio Sokura <tapio.sokura@iki.fi>;
Subject: Re: [TLS] PR#1091: Changes to provide middlebox robustness

They are basically doing a supported_versions extension with only one entry in the ServerHello.
The problem with future middleboxes should be obvious.

________________________________________
From: Peter Saint-Andre <stpeter@stpeter.im>;
Sent: Wednesday, November 22, 2017 11:02:39 AM
To: Yuhong Bao; Eric Rescorla
Cc: tls@ietf.org; Tapio Sokura
Subject: Re: [TLS] PR#1091: Changes to provide middlebox robustness

On 11/22/17 11:16 AM, Yuhong Bao wrote:
> The problem is not TLS 1.3, the problem is future versions of TLS.

Would you mind explaining that in more detail?

Peter

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