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<h1>Crowdsec</h1>
<div class="admonition quote">
<p class="admonition-title">What is Crowdsec?</p>
<p>Crowdsec is an open source software that detects and blocks attackers using log analysis.
It has access to a global community-wide IP reputation database.</p>
<p><a href="https://www.crowdsec.net">Source</a></p>
</div>
<h2 id="installation"><a class="toclink" href="#installation">Installation</a></h2>
<p>Crowdsec supports multiple <a href="https://doc.crowdsec.net/docs/getting_started/install_crowdsec">installation methods</a>, however this page will use the docker installation.</p>
<h3 id="docker-mailserver"><a class="toclink" href="#docker-mailserver">Docker mailserver</a></h3>
<p>In your <code>compose.yaml</code> for the DMS service, add a bind mount volume for <code>/var/log/mail</code>. This is to share the DMS logs to a separate crowdsec container.</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<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="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/docker-data/dms/mail-logs/:/var/log/mail/</span>
</code></pre></div>
</div>
<h3 id="crowdsec"><a class="toclink" href="#crowdsec">Crowdsec</a></h3>
<p>The crowdsec container should also bind mount the same host path for the DMS logs that was added in the DMS example above.</p>
<div class="highlight"><pre><span></span><code><span class="nt">services</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">crowdsecurity/crowdsec</span>
<span class="w"> </span><span class="nt">restart</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">unless-stopped</span>
<span class="w"> </span><span class="nt">ports</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;8080:8080&quot;</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="s">&quot;6060:6060&quot;</span>
<span class="w"> </span><span class="nt">volumes</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/docker-data/dms/mail-logs/:/var/log/dms:ro</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">./acquis.d:/etc/crowdsec/acquis.d</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">crowdsec-db:/var/lib/crowdsec/data/</span>
<span class="w"> </span><span class="nt">environment</span><span class="p">:</span>
<span class="w"> </span><span class="c1"># These collection contains parsers and scenarios for postfix and dovecot</span>
<span class="w"> </span><span class="nt">COLLECTIONS</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">crowdsecurity/postfix crowdsecurity/dovecot</span>
<span class="w"> </span><span class="nt">TZ</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Europe/Paris</span>
<span class="nt">volumes</span><span class="p">:</span>
<span class="w"> </span><span class="nt">crowdsec-db</span><span class="p">:</span>
</code></pre></div>
<h2 id="configuration"><a class="toclink" href="#configuration">Configuration</a></h2>
<p>Configure crowdsec to read and parse DMS logs file.</p>
<div class="admonition example">
<p class="admonition-title">Example</p>
<p>Create the file <code>dms.yml</code> in <code>./acquis.d/</code></p>
<div class="highlight"><pre><span></span><code><span class="nn">---</span>
<span class="nt">source</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">file</span>
<span class="nt">filenames</span><span class="p">:</span>
<span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/var/log/dms/mail.log</span>
<span class="nt">labels</span><span class="p">:</span>
<span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">syslog</span>
</code></pre></div>
</div>
<div class="admonition warning bouncers">
<p class="admonition-title">Warning</p>
<p>Crowdsec on its own is just a detection software, the remediation is done by components called bouncers.
This page does not explain how to install or configure a bouncer. It can be found in <a href="https://doc.crowdsec.net/docs/bouncers/intro">crowdsec documentation</a>.</p>
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