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Re: [Acme] High level comments on draft-barnes-acme (the GitHub version)

Phillip Hallam-Baker <phill@hallambaker.com> Thu, 26 March 2015 16:01 UTC

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From: Phillip Hallam-Baker <phill@hallambaker.com>
To: Martin Thomson <martin.thomson@gmail.com>
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Cc: Jonathan Rudenberg <jonathan@titanous.com>, "acme@ietf.org" <acme@ietf.org>, Jacob Hoffman-Andrews <jsha@eff.org>, Joseph Lorenzo Hall <joe@cdt.org>, John Mattsson <john.mattsson@ericsson.com>
Subject: Re: [Acme] High level comments on draft-barnes-acme (the GitHub version)
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On Thu, Mar 26, 2015 at 10:40 AM, Martin Thomson
<martin.thomson@gmail.com> wrote:
> On 25 March 2015 at 17:21, Jacob Hoffman-Andrews <jsha@eff.org> wrote:
>>> This seems like a big deal, no? That is, since SNI is one of the few
>> things not protected in the TLS handshake, it does seem spoofable. If
>> there's not something I'm missing, it seems like the proposal should
>> just drop DVSNI altogether.
>>
>> An attacker who fully controls the network is explicitly not part of the
>> threat model for any Domain Validation. None of the available techniques
>> for DV, whether they involve fetching a file, sending an email, or doing
>> a TLS handshake can fully mitigate a network attacker.
>
> It has been suggested that some measure of network control can be
> mitigated by originating the validation requests from multiple network
> locations.  That would be down to CA policy though.

It is called 'running a CA'.

That type of conversation is best left to CABForum and discussions
with your friendly neighborhood auditors.

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