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forked-synapse/docs/CAPTCHA_SETUP.md

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Overview

Captcha can be enabled for this home server. This file explains how to do that. The captcha mechanism used is Google's ReCaptcha. This requires API keys from Google.

Getting keys

Requires a site/secret key pair from:

https://developers.google.com/recaptcha/

Must be a reCAPTCHA v2 key using the "I'm not a robot" Checkbox option

Setting ReCaptcha Keys

The keys are a config option on the home server config. If they are not visible, you can generate them via --generate-config. Set the following value:

recaptcha_public_key: YOUR_SITE_KEY
recaptcha_private_key: YOUR_SECRET_KEY

In addition, you MUST enable captchas via:

enable_registration_captcha: true

Configuring IP used for auth

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 X-Forwarded-For (XFF) header instead of the origin IP address. This can be configured using the x_forwarded directive in the listeners section of the homeserver.yaml configuration file.