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11<body>
12<h1 id="enabling-transfer-security-using-tsig---part-ii">Enabling transfer security using TSIG - part II</h1>
13<p>Now we have the key installed.</p>
14<p>A couple of observations:</p>
15<ul>
16<li>you can't do a zone transfer using <code>dig</code> anymore!</li>
17<li>can your partner do a zone transfer ?</li>
18</ul>
19<p>Ask your partner to attempt a zone transfer of your zone from THEIR machine. Does it work ? What do you see in <code>/var/log/bind/general</code> ?</p>
20<h2 id="using-dig-with-a-tsig-key">Using dig with a TSIG key</h2>
21<p>We can get zone transfers working with <code>dig</code>, if we tell <code>dig</code> which key to use!</p>
22<p>Try this, but:</p>
23<ul>
24<li>replace <code>myzone</code> with YOUR zone,</li>
25<li>hostX -&gt; YOUR host key name</li>
26<li>Wup...LejA= -&gt; YOUR key</li>
27</ul>
28<p>For example:</p>
29<pre><code>dig @localhost axfr myzone -y hostX-key:Wup...LejA=</code></pre>
30<p>If everything goes well, you should be able to transfer the zone...</p>
31<p>Check <code>/var/log/bind/transfers</code> - what does it say (use <code>tail</code>)</p>
32<p>Now, you can tell your partner to try it from THEIR machine - but you will need to communicate the KEY to your partner - it's too long to type!</p>
33<h2 id="getting-your-partner-to-use-the-same-tsig-key-to-transfer">Getting your partner to use the same TSIG key to transfer</h2>
34<p>To do this, we're going to need to transfer the TSIG key from your machine to theirs.</p>
35<p>We can use Secure Copy for this.</p>
36<p>We can copy the PRIVATE key file we generated earlier, to their machine.</p>
37<p>To do this, it's easiest to COPY the key with your mouse, then SSH into the PARTNER machine and copy the key there.</p>
38<p>So, at the bottom of <code>/etc/bind/named.conf.options</code>, find your TSIG key:</p>
39<pre><code>key &quot;host25-key&quot; {
40   algorithm hmac-md5;
41   secret &quot;Wup...LejA=&quot;; // Copy YOUR key
42goes here!
43};</code></pre>
44<p>Once you have done this, you can paste the key into Notepad or any text editor, and keep it ready, for the next part.</p>
45<p>Once you have done this, help your partner update their BIND config to use the key for TSIG. The easiest is to open a new SSH connection and log into your partner's host - talk to them about it!</p>
46<h2 id="on-your-partners-host">On your partner's host</h2>
47<p>You should have the key ready to paste. Make sure you are logged in to your partner's host using SSH (use the <code>hostname</code> command) just in case.</p>
48<h3 id="add-tsig-key-to-bind-configuration">Add TSIG key to BIND configuration</h3>
49<p>Now, on your PARTNER's host, edit <code>/etc/bind/named.conf.options</code>, and we'll add the key and a statement that it should be used with the MASTER host:</p>
50<pre><code>sudo vi /etc/bind/named.conf.options</code></pre>
51<p>Go all the way to the bottom, and add this:</p>
52<pre><code>key hostX-key {
53        algorithm hmac-md5;
54        secret &quot;Wu...A=&quot;;       // PASTE they key between &quot; and &quot;
55};
56server 10.10.0.25 {
57        keys { host25-key; };
58};</code></pre>
59<p>One last thing - to make sure that zone transfer works, we need to remove the existing slave copy - otherwise we won't see if BIND on the slave was able to transfer the zone!</p>
60<p>start by deleting the SLAVE copy- to do this, look at the zone definition (normally, in named.conf.local, but they may have put it somewhere else), and find the &quot;file&quot; line, for example:</p>
61<pre><code>   file &quot;/var/cache/bind/db.zone_of_your_partner.slave&quot;;</code></pre>
62<p>Find the file and REMOVE it:</p>
63<pre><code>   sudo rm /var/cache/bind/db.zone_of_your_partner.slave</code></pre>
64<h3 id="restart-named">Restart named</h3>
65<p>If all went well, it's time to restart named (still on your PARTNER's host)</p>
66<pre><code>sudo service bind9 restart</code></pre>
67<p>Now, please check:</p>
68<ul>
69<li>on the MASTER host: <code>/var/log/bind/transfers</code> and <code>/var/log/bind/general</code></li>
70<li>on the SLAVE host: see if the zone was successfully transfered</li>
71<li>test with dig on both MASTER and SLAVE - you don't need to TSIG for simple queries, so you can query the slave for &quot;myzone SOA&quot; and see what you get.</li>
72</ul>
73</body>
74</html>