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Re: [TLS] Downgrade Dance steps (Re: drop obsolete SSL 2 backwards compatibility from TLS 1.3 draft)

Dave Garrett <davemgarrett@gmail.com> Sat, 14 February 2015 17:04 UTC

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From: Dave Garrett <davemgarrett@gmail.com>
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Date: Sat, 14 Feb 2015 12:04:34 -0500
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Cc: Florian Weimer <fweimer@redhat.com>
Subject: Re: [TLS] Downgrade Dance steps (Re: drop obsolete SSL 2 backwards compatibility from TLS 1.3 draft)
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On Saturday, February 14, 2015 03:54:29 am Martin Rex wrote:
> What's a little weird about the MSIE downgrade dances:
>   - duplicated attempts with certain Hellos in certain configurations
>   - empty connection attempts when SSLv2 is disabled.
[...]
> everything enabled (SSLv2->TLSv1.2):
[...]
> SSLv2 plus default (SSLv3,TLSv1.0,TLSv1.1):
[...]
> SSLv2 plus TLSv1.0+TLSv1.1 (this looks weird!):
[...]
> SSLv3->TLSv1.2:
[...]
> TLSv1.0+TLSv1.1+TLSv1.2
[...]
> TLSv1.1+TLSv1.2
[...]
> TLSv1.2 alone
[...]
> SSLv3+TLSv1.2
[...]
> TLSv1.0+TLSv1.2
[...]
> SSLv2+TLSv1.2

Are there any other clients that allow fine-grained enabling/disabling of each version? Firefox and Chrome set min/max. Safari is incompetent and provides no configuration. IE is the only one that seems to allow this wide list of configurations, and the resulting oddities. I'm curious what non-browser clients do here commonly.


Dave

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