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Re: [TLS] I-D Action: draft-ietf-tls-negotiated-ff-dhe-10.txt

Tony Arcieri <bascule@gmail.com> Wed, 03 June 2015 06:52 UTC

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From: Tony Arcieri <bascule@gmail.com>
Date: Tue, 02 Jun 2015 23:52:36 -0700
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To: Yuhong Bao <yuhongbao_386@hotmail.com>
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Cc: Geoffrey Keating <geoffk@geoffk.org>, TLS WG <tls@ietf.org>
Subject: Re: [TLS] I-D Action: draft-ietf-tls-negotiated-ff-dhe-10.txt
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Yes sorry I meant ClientKeyExchange...

But can you explain to me how this solves the problem for legacy clients?

On Tue, Jun 2, 2015 at 11:52 PM, Yuhong Bao <yuhongbao_386@hotmail.com>
wrote:

> The client don't receive the ServerKeyExchange message containing the DHE
> key at all until after they sent the ClientHello.
>
> ________________________________
> > From: bascule@gmail.com
> > Date: Tue, 2 Jun 2015 23:35:46 -0700
> > To: geoffk@geoffk.org
> > CC: tls@ietf.org
> > Subject: Re: [TLS] I-D Action: draft-ietf-tls-negotiated-ff-dhe-10.txt
> >
> > On Tue, Jun 2, 2015 at 11:32 PM, Geoffrey Keating
> > <geoffk@geoffk.org<mailto:geoffk@geoffk.org>> wrote:
> > It's covered in section 4:
> >
> > If at least one FFDHE ciphersuite is present in the client
> > ciphersuite list, and the Supported Groups extension is either absent
> > from the ClientHello
> >
> > Unless I'm mistaken, unless you configure the
> > jdk.tls.disabledAlgorithms property explicitly (with e.g. "DHE keySize
> >> 2048"), Java clients are aborting *before* they send the ClientHello.
> > Please let me know if you're seeing otherwise. I could be mistaken and
> > perhaps there's a server-side workaround for this that isn't "disable
> > all DHE ciphersuites". But this is what I've personally observed and
> > have been advising people about.
> >
> > I'm not saying it can't be fixed with additional
> > configuration/errata/etc, I'm arguing that it's *breaking clients in
> > the field right now*
> >
> > tl;dr: I am seeing *widespread TLS breakages* because of this resulting
> > in *huge outages* for Java clients
> >
> > --
> > Tony Arcieri
> >
> > _______________________________________________ TLS mailing list
> > TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
>
>



-- 
Tony Arcieri

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