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<h1 id="how-to-test-saml-as-a-developer-without-a-server"><a class="header" href="#how-to-test-saml-as-a-developer-without-a-server">How to test SAML as a developer without a server</a></h1>
<p>https://fujifish.github.io/samling/samling.html (https://github.com/fujifish/samling) is a great resource for being able to tinker with the
SAML options within Synapse without needing to deploy and configure a complicated software stack.</p>
<p>To make Synapse (and therefore Element) use it:</p>
<ol>
<li>Use the samling.html URL above or deploy your own and visit the IdP Metadata tab.</li>
<li>Copy the XML to your clipboard.</li>
<li>On your Synapse server, create a new file <code>samling.xml</code> next to your <code>homeserver.yaml</code> with
the XML from step 2 as the contents.</li>
<li>Edit your <code>homeserver.yaml</code> to include:
<pre><code class="language-yaml">saml2_config:
sp_config:
allow_unknown_attributes: true # Works around a bug with AVA Hashes: https://github.com/IdentityPython/pysaml2/issues/388
metadata:
local: ["samling.xml"]
</code></pre>
</li>
<li>Ensure that your <code>homeserver.yaml</code> has a setting for <code>public_baseurl</code>:
<pre><code class="language-yaml">public_baseurl: http://localhost:8080/
</code></pre>
</li>
<li>Run <code>apt-get install xmlsec1</code> and <code>pip install --upgrade --force 'pysaml2>=4.5.0'</code> to ensure
the dependencies are installed and ready to go.</li>
<li>Restart Synapse.</li>
</ol>
<p>Then in Element:</p>
<ol>
<li>Visit the login page and point Element towards your homeserver using the <code>public_baseurl</code> above.</li>
<li>Click the Single Sign-On button.</li>
<li>On the samling page, enter a Name Identifier and add a SAML Attribute for <code>uid=your_localpart</code>.
The response must also be signed.</li>
<li>Click "Next".</li>
<li>Click "Post Response" (change nothing).</li>
<li>You should be logged in.</li>
</ol>
<p>If you try and repeat this process, you may be automatically logged in using the information you
gave previously. To fix this, open your developer console (<code>F12</code> or <code>Ctrl+Shift+I</code>) while on the
samling page and clear the site data. In Chrome, this will be a button on the Application tab.</p>
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