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It looks like CAPTCHA_SETUP.rst contains information relevant to an old version of Synapse, but Synapse now has a different approach to configuring use of the X-Forwarded-For header.
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Captcha can be enabled for this home server. This file explains how to do that.
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The captcha mechanism used is Google's ReCaptcha. This requires API keys from Google.
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Getting keys
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------------
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Requires a public/private key pair from:
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https://developers.google.com/recaptcha/
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Setting ReCaptcha Keys
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----------------------
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The keys are a config option on the home server config. If they are not
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visible, you can generate them via --generate-config. Set the following value::
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recaptcha_public_key: YOUR_PUBLIC_KEY
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recaptcha_private_key: YOUR_PRIVATE_KEY
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In addition, you MUST enable captchas via::
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enable_registration_captcha: true
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Configuring IP used for auth
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----------------------------
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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 X-Forwarded-For (XFF) header instead of the origin
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IP address. This can be configured using the x_forwarded directive in the
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listeners section of the homeserver.yaml configuration file.
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