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<h1 id="mqtt">MQTT</h1>
<h3 id="discovery">Discovery</h3>
<p>MQTT client:</p>
<ul>
<li>mqtt-spy</li>
<li><a href="https://asciinema.org/a/DlPmJwXbhuAURHseamGdMy4z3/embed?speed=2\&amp;autoplay=true">MQTT CLI</a></li>
<li><a href="https://chrome.google.com/webstore/detail/mqttlens/hemojaaeigabkbcookmlgmdigohjobjm">MQTT Lens</a></li>
<li>MQTT.fx</li>
<li>mosquitto_tools</li>
</ul>
<p>Scan an MQTT with nmap : <code>nmap -p 1883 -vvv --script=mqtt-subscribe -d sensors.domain.com</code></p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="n">mosquitto_sub</span> <span class="n">-h</span> <span class="n">sensors</span><span class="p">.</span><span class="n">domain</span><span class="p">.</span><span class="n">com</span> <span class="n">-t</span> <span class="s1">&#39;#&#39;</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="n">mosquitto_sub</span> <span class="n">-h</span> <span class="n">sensors</span><span class="p">.</span><span class="n">domain</span><span class="p">.</span><span class="n">com</span> <span class="n">-t</span> <span class="s1">&#39;+&#39;</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">mosquitto_sub</span> <span class="n">-h</span> <span class="n">sensors</span><span class="p">.</span><span class="n">domain</span><span class="p">.</span><span class="n">com</span> <span class="n">-t</span> <span class="s2">&quot;/sensor/&quot;</span>
</code></pre></div>
<h3 id="explore-mqtt">Explore MQTT</h3>
<p>Connect and subscribe to every topics using the <code>#</code> keyword.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kn">import</span> <span class="nn">paho.mqtt.client</span> <span class="k">as</span> <span class="nn">mqtt</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="k">def</span> <span class="nf">on_connect</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="n">userdata</span><span class="p">,</span> <span class="n">flags</span><span class="p">,</span> <span class="n">rc</span><span class="p">):</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> <span class="nb">print</span> <span class="s2">&quot;[+] Connection successful&quot;</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> <span class="n">client</span><span class="o">.</span><span class="n">subscribe</span><span class="p">(</span><span class="s1">&#39;#&#39;</span><span class="p">,</span> <span class="n">qos</span> <span class="o">=</span> <span class="mi">1</span><span class="p">)</span> <span class="c1"># Subscribe to all topics</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> <span class="n">client</span><span class="o">.</span><span class="n">subscribe</span><span class="p">(</span><span class="s1">&#39;$SYS/#&#39;</span><span class="p">)</span> <span class="c1"># Broker Status (Mosquitto)</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="k">def</span> <span class="nf">on_message</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="n">userdata</span><span class="p">,</span> <span class="n">msg</span><span class="p">):</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a> <span class="nb">print</span> <span class="s1">&#39;[+] Topic: </span><span class="si">%s</span><span class="s1"> - Message: </span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">msg</span><span class="o">.</span><span class="n">topic</span><span class="p">,</span> <span class="n">msg</span><span class="o">.</span><span class="n">payload</span><span class="p">)</span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="n">client</span> <span class="o">=</span> <span class="n">mqtt</span><span class="o">.</span><span class="n">Client</span><span class="p">(</span><span class="n">client_id</span> <span class="o">=</span> <span class="s2">&quot;MqttClient&quot;</span><span class="p">)</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="n">client</span><span class="o">.</span><span class="n">on_connect</span> <span class="o">=</span> <span class="n">on_connect</span>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="n">client</span><span class="o">.</span><span class="n">on_message</span> <span class="o">=</span> <span class="n">on_message</span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="n">client</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="s1">&#39;SERVER IP HERE&#39;</span><span class="p">,</span> <span class="mi">1883</span><span class="p">,</span> <span class="mi">60</span><span class="p">)</span>
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="n">client</span><span class="o">.</span><span class="n">loop_forever</span><span class="p">()</span>
</code></pre></div>
<p>Send MQTT requests</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">import</span> <span class="nn">paho.mqtt.client</span> <span class="k">as</span> <span class="nn">mqtt</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="k">def</span> <span class="nf">on_connect</span><span class="p">(</span><span class="n">client</span><span class="p">,</span> <span class="n">userdata</span><span class="p">,</span> <span class="n">flags</span><span class="p">,</span> <span class="n">rc</span><span class="p">):</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> <span class="nb">print</span> <span class="s2">&quot;[+] Connection success&quot;</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="n">client</span> <span class="o">=</span> <span class="n">mqtt</span><span class="o">.</span><span class="n">Client</span><span class="p">(</span><span class="n">client_id</span> <span class="o">=</span> <span class="s2">&quot;MqttClient&quot;</span><span class="p">)</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="n">client</span><span class="o">.</span><span class="n">on_connect</span> <span class="o">=</span> <span class="n">on_connect</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="n">client</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="s1">&#39;IP SERVER HERE&#39;</span><span class="p">,</span> <span class="mi">1883</span><span class="p">,</span> <span class="mi">60</span><span class="p">)</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="n">client</span><span class="o">.</span><span class="n">publish</span><span class="p">(</span><span class="s1">&#39;smarthouse/garage/door&#39;</span><span class="p">,</span> <span class="s2">&quot;{&#39;open&#39;:&#39;true&#39;}&quot;</span><span class="p">)</span>
</code></pre></div>
<h3 id="mqtt-fuzzing">MQTT Fuzzing</h3>
<ul>
<li><a href="https://github.com/F-Secure/mqtt_fuzz">MQTT-Fuzz</a></li>
</ul>
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