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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This suggestion for item 8 works for GlobalSign so you can replace our recommendation with the one below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><br>
Doug<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> public-bounces@cabforum.org [mailto:public-bounces@cabforum.org]
<b>On Behalf Of </b>Ben Wilson<br>
<b>Sent:</b> Friday, February 13, 2015 3:39 PM<br>
<b>To:</b> CABFPub<br>
<b>Subject:</b> Re: [cabfpub] [cabfquest] Domain Validation Revision<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Forwarding from questions list.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
<a href="mailto:questions-bounces@cabforum.org">questions-bounces@cabforum.org</a> [<a href="mailto:questions-bounces@cabforum.org">mailto:questions-bounces@cabforum.org</a>]
<b>On Behalf Of </b>Jacob Hoffman-Andrews<br>
<b>Sent:</b> Friday, February 13, 2015 11:01 AM<br>
<b>To:</b> <a href="mailto:questions@cabforum.org">questions@cabforum.org</a><br>
<b>Subject:</b> Re: [cabfquest] [cabfpub] Domain Validation Revision<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<pre>Following up from a thread on cabfpub:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>On 02/12/2015 07:08 PM, Ryan Sleevi wrote:<o:p></o:p></pre>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre>8 concerns me for a couple reasons, even though it's moving in the<o:p></o:p></pre>
<pre>right direction.<o:p></o:p></pre>
<pre>- You require HTTPS, but that seems overkill, when you only need to<o:p></o:p></pre>
<pre>perform a TLS handshake. That is, consider a mail server configured<o:p></o:p></pre>
<pre>for SMTP-S - it seems that would be a viable configuration<o:p></o:p></pre>
</blockquote>
<pre>Agreed. As a concrete example, the ACME spec under discussion at IETF<o:p></o:p></pre>
<pre>proposes a challenge type called "Domain Validation with Server Name<o:p></o:p></pre>
<pre>Indication," or DVSNI for short:<o:p></o:p></pre>
<pre><a href="http://www.ietf.org/id/draft-barnes-acme-01.txt">http://www.ietf.org/id/draft-barnes-acme-01.txt</a>.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>We believe that DVSNI allows us to offer a higher level of assurance<o:p></o:p></pre>
<pre>than item (6), "making an agreed-upon change to information found on an<o:p></o:p></pre>
<pre>online Web page," since some sites allow arbitrary file upload, either<o:p></o:p></pre>
<pre>by intent or by accident. We're planning to use it for the Let's Encrypt<o:p></o:p></pre>
<pre>CA for that reason, so we'd like to make sure that item (8) allows for<o:p></o:p></pre>
<pre>DVSNI.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>For example, here is a version of item (8) that we think would work:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre>Having the Applicant demonstrate practical control over the FQDN by<o:p></o:p></pre>
<pre>providing a TLS service on a host found in DNS for the FQDN. The CA<o:p></o:p></pre>
<pre>SHALL initiate a TLS connection with that host and verify that the<o:p></o:p></pre>
<pre>response contains unique, unguessable information proposed by the CA, in<o:p></o:p></pre>
<pre>a well-specified format.<o:p></o:p></pre>
</blockquote>
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