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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="setup/forward_proxy.html">Configuring a Forward/Outbound Proxy</a></li><li class="chapter-item expanded "><a href="turn-howto.html">Configuring a Turn Server</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="setup/turn/coturn.html">coturn TURN server</a></li><li class="chapter-item expanded "><a href="setup/turn/eturnal.html">eturnal TURN server</a></li></ol></li><li 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Web Tokens</a></li><li class="chapter-item expanded "><a href="usage/configuration/user_authentication/refresh_tokens.html">Refresh Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="CAPTCHA_SETUP.html" class="active">Registration Captcha</a></li><li class="chapter-item expanded "><a href="application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="user_directory.html">User Directory</a></li><li class="chapter-item expanded "><a href="message_retention_policies.html">Message Retention Policies</a></li><li class="chapter-item expanded "><a href="modules/index.html">Pluggable Modules</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="modules/writing_a_module.html">Writing a module</a></li><li><ol class="section"><li 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section callbacks</a></li><li class="chapter-item expanded "><a href="modules/porting_legacy_module.html">Porting a legacy module to the new interface</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="workers.html">Workers</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="synctl_workers.html">Using synctl with Workers</a></li><li class="chapter-item expanded "><a href="systemd-with-workers/index.html">Systemd</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="usage/administration/admin_api/background_updates.html">Background Updates</a></li><li class="chapter-item 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<h1 id="overview"><a class="header" href="#overview">Overview</a></h1>
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<p>A captcha can be enabled on your homeserver to help prevent bots from registering
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accounts. Synapse currently uses Google's reCAPTCHA service which requires API keys
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from Google.</p>
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<h2 id="getting-api-keys"><a class="header" href="#getting-api-keys">Getting API keys</a></h2>
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<ol>
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<li>Create a new site at <a href="https://www.google.com/recaptcha/admin/create">https://www.google.com/recaptcha/admin/create</a></li>
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<li>Set the label to anything you want</li>
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<li>Set the type to reCAPTCHA v2 using the "I'm not a robot" Checkbox option.
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This is the only type of captcha that works with Synapse.</li>
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<li>Add the public hostname for your server, as set in <code>public_baseurl</code>
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in <code>homeserver.yaml</code>, to the list of authorized domains. If you have not set
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<code>public_baseurl</code>, use <code>server_name</code>.</li>
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<li>Agree to the terms of service and submit.</li>
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<li>Copy your site key and secret key and add them to your <code>homeserver.yaml</code>
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configuration file
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<pre><code class="language-yaml">recaptcha_public_key: YOUR_SITE_KEY
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recaptcha_private_key: YOUR_SECRET_KEY
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</code></pre>
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</li>
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<li>Enable the CAPTCHA for new registrations
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<pre><code class="language-yaml">enable_registration_captcha: true
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</code></pre>
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</li>
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<li>Go to the settings page for the CAPTCHA you just created</li>
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<li>Uncheck the "Verify the origin of reCAPTCHA solutions" checkbox so that the
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captcha can be displayed in any client. If you do not disable this option then you
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must specify the domains of every client that is allowed to display the CAPTCHA.</li>
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</ol>
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<h2 id="configuring-ip-used-for-auth"><a class="header" href="#configuring-ip-used-for-auth">Configuring IP used for auth</a></h2>
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<p>The reCAPTCHA API requires that the IP address of the user who solved the
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CAPTCHA is sent. If the client is connecting through a proxy or load balancer,
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it may be required to use the <code>X-Forwarded-For</code> (XFF) header instead of the origin
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IP address. This can be configured using the <code>x_forwarded</code> directive in the
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listeners section of the <code>homeserver.yaml</code> configuration file.</p>
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