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

Tony Arcieri <bascule@gmail.com> Wed, 03 June 2015 06:38 UTC

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From: Tony Arcieri <bascule@gmail.com>
Date: Tue, 2 Jun 2015 23:37:24 -0700
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To: Geoffrey Keating <geoffk@geoffk.org>
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Cc: TLS WG <tls@ietf.org>
Subject: Re: [TLS] I-D Action: draft-ietf-tls-negotiated-ff-dhe-10.txt
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The error is specifically:

Java::JavaLang::RuntimeException: Could not generate DH keypair


On Tue, Jun 2, 2015 at 11:35 PM, Tony Arcieri <bascule@gmail.com> wrote:

> On Tue, Jun 2, 2015 at 11:32 PM, Geoffrey Keating <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
>



-- 
Tony Arcieri