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Single Encryption Key / Global Method
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<a href="https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/config/security/mail_crypt.md" title="Edit this page" class="md-content__button md-icon">
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<h1>Mail Encryption</h1>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.</p>
<p>In case of unauthorized access to the storage backend, the messages will, without access to the decryption keys, be unreadable to the offending party.</p>
<p>There can be a single encryption key for the whole system or each user can have a key of their own. The used cryptographical methods are widely used standards and keys are stored in portable formats, when possible.</p>
</div>
<p>Official Dovecot documentation: <a href="https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/">https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/</a></p>
<hr />
<h2 id="single-encryption-key-global-method"><a class="toclink" href="#single-encryption-key-global-method">Single Encryption Key / Global Method</a></h2>
<ol>
<li>
<p>Create <code>10-custom.conf</code> and populate it with the following:</p>
<div class="highlight"><pre><span></span><code># Enables mail_crypt for all services (imap, pop3, etc)
mail_plugins = $mail_plugins mail_crypt
plugin {
mail_crypt_global_private_key = &lt;/certs/ecprivkey.pem
mail_crypt_global_public_key = &lt;/certs/ecpubkey.pem
mail_crypt_save_version = 2
}
</code></pre></div>
</li>
<li>
<p>Shutdown your mailserver (<code>docker compose down</code>)</p>
</li>
<li>
<p>You then need to <a href="https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/#ec-key">generate your global EC key</a>. We named them <code>/certs/ecprivkey.pem</code> and <code>/certs/ecpubkey.pem</code> in step #1.</p>
</li>
<li>
<p>The EC key needs to be available in the container. I prefer to mount a /certs directory into the container:
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ghcr.io/docker-mailserver/docker-mailserver:latest</span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">. . .</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">- ./certs/:/certs</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">. . .</span>
</code></pre></div></p>
</li>
<li>
<p>While you're editing the <code>compose.yaml</code>, add the configuration file:
<div class="highlight"><pre><span></span><code><span class="nt">services</span><span class="p">:</span>
<span class="w"> </span><span class="nt">mailserver</span><span class="p">:</span>
<span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ghcr.io/docker-mailserver/docker-mailserver:latest</span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">. . .</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">- ./config/dovecot/10-custom.conf:/etc/dovecot/conf.d/10-custom.conf</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">- ./certs/:/certs</span>
<span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">. . .</span>
</code></pre></div></p>
</li>
<li>
<p>Start the container, monitor the logs for any errors, send yourself a message, and then confirm the file on disk is encrypted:
<div class="highlight"><pre><span></span><code>[root@ip-XXXXXXXXXX ~]# cat -A /mnt/efs-us-west-2/maildata/awesomesite.com/me/cur/1623989305.M6v<36>z<EFBFBD>@<40><> m}<7D><>,<2C><>9<EFBFBD><39><EFBFBD><EFBFBD>B*<2A>247.us-west-2.compute.inE<6E><45>\Ck*<2A>@7795,W=7947:2,
T<EFBFBD>9<EFBFBD>8t<EFBFBD>6<EFBFBD><EFBFBD> t<><74><EFBFBD>e<EFBFBD>W<EFBFBD><57>S `<60>H<EFBFBD><48>C<EFBFBD>ڤ <20>yeY<65><59>XZ<58><5A>^<5E>d<EFBFBD>/<2F><>+<2B>A
</code></pre></div></p>
</li>
</ol>
<p>This should be the minimum required for encryption of the mail while in storage.</p>
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