Re: [saag] AD review of draft-iab-crypto-alg-agility-06

Eliot Lear <lear@cisco.com> Wed, 26 August 2015 11:50 UTC

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From: Eliot Lear <lear@cisco.com>
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Date: Wed, 26 Aug 2015 13:49:56 +0200
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Subject: Re: [saag] AD review of draft-iab-crypto-alg-agility-06
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Hi,

On 8/25/15 6:55 PM, Viktor Dukhovni wrote:

> The nasty part is that cleartext fallback is not always desirable
> or available.  Sendmail IIRC does not fall back after STARTTLS
> handshake failure.

Yes that's right.  Instead you get a 403 4.7.0 TLS handshake failed. 
This is now happening all over the place, as it turns out, due to the
recent changes to the OpenSSL library involving dh processing.

Eliot