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Re: [TLS] Further TLS 1.3 deployment updates

Nico Williams <nico@cryptonector.com> Fri, 14 December 2018 18:50 UTC

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Date: Fri, 14 Dec 2018 12:50:26 -0600
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From: Nico Williams <nico@cryptonector.com>
To: David Benjamin <davidben@chromium.org>
Cc: "<tls@ietf.org>" <tls@ietf.org>
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Subject: Re: [TLS] Further TLS 1.3 deployment updates
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On Wed, Dec 12, 2018 at 04:21:43PM -0600, David Benjamin wrote:
> We have one more update for you all on TLS 1.3 deployment issues. Over the
> course of deploying TLS 1.3 to Google servers, we found that JDK 11
> unfortunately implemented TLS 1.3 incorrectly. On resumption, it fails to
> send the SNI extension. This means that the first connection from a JDK 11
> client will work, but subsequent ones fail.
> https://bugs.openjdk.java.net/browse/JDK-8211806

I'm told that OpenSSL accidentally takes the SNI from the initial
connection on resumption if there's no SNI in the resumption.  This
seems like a very good workaround for the buggy JDK 11 TLS 1.3 client,
as it has no fingerprinting nor downgrade considerations.

If the server rejects resumption I guess the client would still fail,
but this is much better than failing at 100% of all resumptions and
better than adding fingerprinting and downgrades.

Nico
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