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  <div class="section" id="welcome-to-certbot-dns-rfc2136-s-documentation">
<h1>Welcome to certbot-dns-rfc2136’s documentation!<a class="headerlink" href="#welcome-to-certbot-dns-rfc2136-s-documentation" title="Permalink to this headline"></a></h1>
<div class="toctree-wrapper compound">
</div>
<span class="target" id="module-certbot_dns_rfc2136"></span><p>The <a class="reference internal" href="api/dns_rfc2136.html#module-certbot_dns_rfc2136.dns_rfc2136" title="certbot_dns_rfc2136.dns_rfc2136"><code class="xref py py-obj docutils literal"><span class="pre">dns_rfc2136</span></code></a> plugin automates the process of
completing a <code class="docutils literal"><span class="pre">dns-01</span></code> challenge (<code class="xref py py-obj docutils literal"><span class="pre">DNS01</span></code>) by creating, and
subsequently removing, TXT records using RFC 2136 Dynamic Updates.</p>
<div class="section" id="named-arguments">
<h2>Named Arguments<a class="headerlink" href="#named-arguments" title="Permalink to this headline"></a></h2>
<table border="1" class="docutils">
<colgroup>
<col width="50%" />
<col width="50%" />
</colgroup>
<tbody valign="top">
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">--dns-rfc2136-credentials</span></code></td>
<td>RFC 2136 <a class="reference internal" href="#credentials">credentials</a> INI file.
(Required)</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">--dns-rfc2136-propagation-seconds</span></code></td>
<td>The number of seconds to wait for DNS
to propagate before asking the ACME
server to verify the DNS record.
(Default: 60)</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="credentials">
<h2>Credentials<a class="headerlink" href="#credentials" title="Permalink to this headline"></a></h2>
<p>Use of this plugin requires a configuration file containing the target DNS
server that supports RFC 2136 Dynamic Updates, the name of the TSIG key, the
TSIG key secret itself and the algorithm used if it’s different to HMAC-MD5.</p>
<div class="literal-block-wrapper docutils container" id="credentials-ini">
<div class="code-block-caption"><span class="caption-text">Example credentials file:</span><a class="headerlink" href="#credentials-ini" title="Permalink to this code"></a></div>
<div class="highlight-ini"><div class="highlight"><pre><span></span><span class="c1"># Target DNS server</span>
<span class="na">dns_rfc2136_server</span> <span class="o">=</span> <span class="s">192.0.2.1</span>
<span class="c1"># TSIG key name</span>
<span class="na">dns_rfc2136_name</span> <span class="o">=</span> <span class="s">keyname.</span>
<span class="c1"># TSIG key secret</span>
<span class="na">dns_rfc2136_secret</span> <span class="o">=</span> <span class="s">4q4wM/2I180UXoMyN4INVhJNi8V9BCV+jMw2mXgZw/CSuxUT8C7NKKFs AmKd7ak51vWKgSl12ib86oQRPkpDjg==</span>
<span class="c1"># TSIG key algorithm</span>
<span class="na">dns_rfc2136_algorithm</span> <span class="o">=</span> <span class="s">HMAC-SHA512</span>
</pre></div>
</div>
</div>
<p>The path to this file can be provided interactively or using the
<code class="docutils literal"><span class="pre">--dns-rfc2136-credentials</span></code> command-line argument. Certbot records the
path to this file for use during renewal, but does not store the file’s contents.</p>
<div class="admonition caution">
<p class="first admonition-title">Caution</p>
<p class="last">You should protect this TSIG key material as it can be used to potentially
add, update, or delete any record in the target DNS server. Users who can
read this file can use these credentials to issue arbitrary API calls on
your behalf. Users who can cause Certbot to run using these credentials can
complete a <code class="docutils literal"><span class="pre">dns-01</span></code> challenge to acquire new certificates or revoke
existing certificates for associated domains, even if those domains aren’t
being managed by this server.</p>
</div>
<p>Certbot will emit a warning if it detects that the credentials file can be
accessed by other users on your system. The warning reads “Unsafe permissions
on credentials configuration file”, followed by the path to the credentials
file. This warning will be emitted each time Certbot uses the credentials file,
including for renewal, and cannot be silenced except by addressing the issue
(e.g., by using a command like <code class="docutils literal"><span class="pre">chmod</span> <span class="pre">600</span></code> to restrict access to the file).</p>
<div class="section" id="sample-bind-configuration">
<h3>Sample BIND configuration<a class="headerlink" href="#sample-bind-configuration" title="Permalink to this headline"></a></h3>
<p>Here’s a sample BIND configuration for Certbot to use. You will need to
generate a new TSIG key, include it in the BIND configuration and grant it
permission to issue updates on the target DNS zone.</p>
<div class="literal-block-wrapper docutils container" id="id1">
<div class="code-block-caption"><span class="caption-text">Generate a new SHA512 TSIG key</span><a class="headerlink" href="#id1" title="Permalink to this code"></a></div>
<div class="highlight-bash"><div class="highlight"><pre><span></span>dnssec-keygen -a HMAC-SHA512 -b <span class="m">512</span> -n HOST keyname.
</pre></div>
</div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">There are a few tools shipped with BIND that can all generate TSIG keys;
<code class="docutils literal"><span class="pre">dnssec-keygen</span></code>, <code class="docutils literal"><span class="pre">rndc-confgen</span></code>, and <code class="docutils literal"><span class="pre">ddns-confgen</span></code>. Try and use the
most secure algorithm supported by your DNS server.</p>
</div>
<div class="literal-block-wrapper docutils container" id="id2">
<div class="code-block-caption"><span class="caption-text">Sample BIND configuration</span><a class="headerlink" href="#id2" title="Permalink to this code"></a></div>
<div class="highlight-none"><div class="highlight"><pre><span></span>key &quot;keyname.&quot; {
  algorithm hmac-sha512;
  secret &quot;4q4wM/2I180UXoMyN4INVhJNi8V9BCV+jMw2mXgZw/CSuxUT8C7NKKFs AmKd7ak51vWKgSl12ib86oQRPkpDjg==&quot;;
};

zone &quot;example.com.&quot; IN {
  type master;
  file &quot;named.example.com&quot;;
  update-policy {
    grant keyname. name _acme-challenge.example.com. txt;
  };
};
</pre></div>
</div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This configuration limits the scope of the TSIG key to just be able to
add and remove TXT records for one specific host for the purpose of
completing the <code class="docutils literal"><span class="pre">dns-01</span></code> challenge. If your version of BIND doesn’t
support the
<a class="reference external" href="http://www.zytrax.com/books/dns/ch7/xfer.html#update-policy">update-policy</a>
directive then you can use the less-secure
<a class="reference external" href="http://www.zytrax.com/books/dns/ch7/xfer.html#allow-update">allow-update</a>
directive instead.</p>
</div>
</div>
</div>
<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="literal-block-wrapper docutils container" id="id3">
<div class="code-block-caption"><span class="caption-text">To acquire a certificate for <code class="docutils literal"><span class="pre">example.com</span></code></span><a class="headerlink" href="#id3" title="Permalink to this code"></a></div>
<div class="highlight-bash"><div class="highlight"><pre><span></span>certbot certonly <span class="se">\</span>
  --dns-rfc2136 <span class="se">\</span>
  --dns-rfc2136-credentials ~/.secrets/certbot/rfc2136.ini <span class="se">\</span>
  -d example.com
</pre></div>
</div>
</div>
<div class="literal-block-wrapper docutils container" id="id4">
<div class="code-block-caption"><span class="caption-text">To acquire a single certificate for both <code class="docutils literal"><span class="pre">example.com</span></code> and
<code class="docutils literal"><span class="pre">www.example.com</span></code></span><a class="headerlink" href="#id4" title="Permalink to this code"></a></div>
<div class="highlight-bash"><div class="highlight"><pre><span></span>certbot certonly <span class="se">\</span>
  --dns-rfc2136 <span class="se">\</span>
  --dns-rfc2136-credentials ~/.secrets/certbot/rfc2136.ini <span class="se">\</span>
  -d example.com <span class="se">\</span>
  -d www.example.com
</pre></div>
</div>
</div>
<div class="literal-block-wrapper docutils container" id="id5">
<div class="code-block-caption"><span class="caption-text">To acquire a certificate for <code class="docutils literal"><span class="pre">example.com</span></code>, waiting 30 seconds
for DNS propagation</span><a class="headerlink" href="#id5" title="Permalink to this code"></a></div>
<div class="highlight-bash"><div class="highlight"><pre><span></span>certbot certonly <span class="se">\</span>
  --dns-rfc2136 <span class="se">\</span>
  --dns-rfc2136-credentials ~/.secrets/certbot/rfc2136.ini <span class="se">\</span>
  --dns-rfc2136-propagation-seconds <span class="m">30</span> <span class="se">\</span>
  -d example.com
</pre></div>
</div>
</div>
</div>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference internal" href="api.html">API Documentation</a></li>
</ul>
</div>
</div>
<div class="section" id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline"></a></h1>
<ul class="simple">
<li><a class="reference internal" href="genindex.html"><span class="std std-ref">Index</span></a></li>
<li><a class="reference internal" href="py-modindex.html"><span class="std std-ref">Module Index</span></a></li>
<li><a class="reference internal" href="search.html"><span class="std std-ref">Search Page</span></a></li>
</ul>
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