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Add Q&A about private DNS graying out on IP address.

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Peter Easton 2020-02-24 05:54:44 +00:00 committed by Daniel Micay
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static/faq.html
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@ -68,6 +68,13 @@
tracking and silent SMS?</a></li>
</ul>
</li>
<li>
<a href="#day-to-day-use">Day to day use</a>
<ul>
<li><a href="#private-dns">When I enter an IP address into private DNS,
the save button grays out. Why?</a></li>
</ul>
</li>
</ul>
<h2 id="device-support">
@ -361,6 +368,28 @@
sending texts or other data is not required or particularly useful to track devices
connected to a network for an adversary with the appropriate access.</p>
<h2 id="day-to-day-use">
<a href="#day-to-day-use">Day to day use</a>
</h2>
<h3 id="private-dns">
<a href="#private-dns">When I enter an IP address into private DNS, the save button
grays out. Why?</a>
</h3>
<p>This is not a bug, but rather the feature is operating as it is intended to. When
operating in forced mode, private DNS requires a <em>domain</em> and will reject invalid
certificates to ensure that the source is authenticated, not just encrypted. Automatic
mode only uses encryption opportunistically, and must be able to fall back to
unauthenticated encryption or fall back to plaintext if the DNS server does not support
DNS over TLS or the certificate is not valid. Although this does not protect against an
active adversary that blocks encrypted communications to the DNS server or will replace
the certificates entirely to intercept the encrypted traffic, automatic will
transparently provide some opportunistic protection against a passive adversary. When a
private DNS provider hostname is specified, the phone will not proceed unless the
certificates for TLS are valid and will not fall back to an unauthenticated or plaintext
connection should the validation fail.</p>
</div>
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