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Re: [TLS] prohibit <1.2 support on 1.3+ servers (but allow clients)

Yoav Nir <ynir.ietf@gmail.com> Thu, 21 May 2015 22:59 UTC

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From: Yoav Nir <ynir.ietf@gmail.com>
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Date: Fri, 22 May 2015 01:59:17 +0300
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To: Watson Ladd <watsonbladd@gmail.com>
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Cc: "maray@microsoft.com" <maray@microsoft.com>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] prohibit <1.2 support on 1.3+ servers (but allow clients)
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> On May 22, 2015, at 1:41 AM, Watson Ladd <watsonbladd@gmail.com> wrote:
> 
> On Thu, May 21, 2015 at 6:34 PM, Yoav Nir <ynir.ietf@gmail.com> wrote:
>> 
>>> On May 22, 2015, at 1:16 AM, Dave Garrett <davemgarrett@gmail.com> wrote:
>>> 
>>> On Thursday, May 21, 2015 05:50:26 pm Yoav Nir wrote:
>>>> According to netmarketshare.com Windows XP is still 16% of desktops/laptops (as measured by web traffic). Add some older mac OS X versions and you reach 17%. Even mobile has some older versions. What this is proposing is to require servers to cut all of those off as a pre-requisite to supporting TLS 1.3.
>>> 
>>> Windows XP & old Mac OS X users can install Mozilla Firefox or Google Chrome (or one of the browsers based on one). It's just the built in browser that won't work because the vendor dropped support.
>> 
>> And you are proposing that we force them to do this? Worse, you are proposing that we deputize all server operators in forcing them to replace their browser?
> 
> If not now, then when?

When those machines rust away, or when their owners decide to buy shiny new ones.

Ultimately, it’s up to the server administrators to decide when to drop support for something. I don’t see where it’s our job to require them to do so as a pre-condition to deploying TLS 1.3. Server implementers will ignore this even if we make it a MUST.

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