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- <h1 id="overview"><a class="header" href="#overview">Overview</a></h1>
- <p>A captcha can be enabled on your homeserver to help prevent bots from registering
- accounts. Synapse currently uses Google's reCAPTCHA service which requires API keys
- from Google.</p>
- <h2 id="getting-api-keys"><a class="header" href="#getting-api-keys">Getting API keys</a></h2>
- <ol>
- <li>Create a new site at <a href="https://www.google.com/recaptcha/admin/create">https://www.google.com/recaptcha/admin/create</a></li>
- <li>Set the label to anything you want</li>
- <li>Set the type to reCAPTCHA v2 using the "I'm not a robot" Checkbox option.
- This is the only type of captcha that works with Synapse.</li>
- <li>Add the public hostname for your server, as set in <code>public_baseurl</code>
- in <code>homeserver.yaml</code>, to the list of authorized domains. If you have not set
- <code>public_baseurl</code>, use <code>server_name</code>.</li>
- <li>Agree to the terms of service and submit.</li>
- <li>Copy your site key and secret key and add them to your <code>homeserver.yaml</code>
- configuration file
- <pre><code class="language-yaml">recaptcha_public_key: YOUR_SITE_KEY
- recaptcha_private_key: YOUR_SECRET_KEY
- </code></pre>
- </li>
- <li>Enable the CAPTCHA for new registrations
- <pre><code class="language-yaml">enable_registration_captcha: true
- </code></pre>
- </li>
- <li>Go to the settings page for the CAPTCHA you just created</li>
- <li>Uncheck the "Verify the origin of reCAPTCHA solutions" checkbox so that the
- captcha can be displayed in any client. If you do not disable this option then you
- must specify the domains of every client that is allowed to display the CAPTCHA.</li>
- </ol>
- <h2 id="configuring-ip-used-for-auth"><a class="header" href="#configuring-ip-used-for-auth">Configuring IP used for auth</a></h2>
- <p>The reCAPTCHA API requires that the IP address of the user who solved the
- CAPTCHA is sent. If the client is connecting through a proxy or load balancer,
- it may be required to use the <code>X-Forwarded-For</code> (XFF) header instead of the origin
- IP address. This can be configured using the <code>x_forwarded</code> directive in the
- listeners section of the <code>homeserver.yaml</code> configuration file.</p>
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