38 lines
1.7 KiB
Markdown
38 lines
1.7 KiB
Markdown
# Overview
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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.
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## Getting API keys
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1. Create a new site at <https://www.google.com/recaptcha/admin/create>
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1. Set the label to anything you want
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1. 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.
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1. Add the public hostname for your server, as set in `public_baseurl`
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in `homeserver.yaml`, to the list of authorized domains. If you have not set
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`public_baseurl`, use `server_name`.
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1. Agree to the terms of service and submit.
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1. Copy your site key and secret key and add them to your `homeserver.yaml`
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configuration file
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```
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recaptcha_public_key: YOUR_SITE_KEY
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recaptcha_private_key: YOUR_SECRET_KEY
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```
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1. Enable the CAPTCHA for new registrations
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```
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enable_registration_captcha: true
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```
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1. Go to the settings page for the CAPTCHA you just created
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1. 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.
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## Configuring IP used for auth
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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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