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<h1 id="using-the-synapse-manhole"><a class="header" href="#using-the-synapse-manhole">Using the synapse manhole</a></h1>
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<p>The "manhole" allows server administrators to access a Python shell on a running
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Synapse installation. This is a very powerful mechanism for administration and
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debugging.</p>
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<p><strong><em>Security Warning</em></strong></p>
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<p>Note that this will give administrative access to synapse to <strong>all users</strong> with
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shell access to the server. It should therefore <strong>not</strong> be enabled in
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environments where untrusted users have shell access.</p>
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<hr />
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<p>To enable it, first uncomment the <code>manhole</code> listener configuration in
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<code>homeserver.yaml</code>. The configuration is slightly different if you're using docker.</p>
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<h4 id="docker-config"><a class="header" href="#docker-config">Docker config</a></h4>
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<p>If you are using Docker, set <code>bind_addresses</code> to <code>['0.0.0.0']</code> as shown:</p>
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<pre><code class="language-yaml">listeners:
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- port: 9000
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bind_addresses: ['0.0.0.0']
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type: manhole
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</code></pre>
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<p>When using <code>docker run</code> to start the server, you will then need to change the command to the following to include the
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<code>manhole</code> port forwarding. The <code>-p 127.0.0.1:9000:9000</code> below is important: it
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ensures that access to the <code>manhole</code> is only possible for local users.</p>
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<pre><code class="language-bash">docker run -d --name synapse \
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--mount type=volume,src=synapse-data,dst=/data \
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-p 8008:8008 \
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-p 127.0.0.1:9000:9000 \
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matrixdotorg/synapse:latest
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</code></pre>
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<h4 id="native-config"><a class="header" href="#native-config">Native config</a></h4>
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<p>If you are not using docker, set <code>bind_addresses</code> to <code>['::1', '127.0.0.1']</code> as shown.
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The <code>bind_addresses</code> in the example below is important: it ensures that access to the
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<code>manhole</code> is only possible for local users).</p>
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<pre><code class="language-yaml">listeners:
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- port: 9000
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bind_addresses: ['::1', '127.0.0.1']
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type: manhole
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</code></pre>
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<h4 id="accessing-synapse-manhole"><a class="header" href="#accessing-synapse-manhole">Accessing synapse manhole</a></h4>
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<p>Then restart synapse, and point an ssh client at port 9000 on localhost, using
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the username <code>matrix</code>:</p>
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<pre><code class="language-bash">ssh -p9000 matrix@localhost
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</code></pre>
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<p>The password is <code>rabbithole</code>.</p>
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<p>This gives a Python REPL in which <code>hs</code> gives access to the
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<code>synapse.server.HomeServer</code> object - which in turn gives access to many other
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parts of the process.</p>
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<p>Note that, prior to Synapse 1.41, any call which returns a coroutine will need to be wrapped in <code>ensureDeferred</code>.</p>
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<p>As a simple example, retrieving an event from the database:</p>
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<pre><code class="language-pycon">>>> from twisted.internet import defer
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>>> defer.ensureDeferred(hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org'))
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<Deferred at 0x7ff253fc6998 current result: <FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''>>
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</code></pre>
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