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2021-09-22 07:42:09 -06:00
< 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 class = "chapter-item expanded " > < a href = "delegate.html" > Delegation< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Upgrading< / li > < li class = "chapter-item expanded " > < a href = "upgrade.html" > Upgrading between Synapse Versions< / a > < / li > < li class = "chapter-item expanded " > < a href = "MSC1711_certificates_FAQ.html" > Upgrading from pre-Synapse 1.0< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Usage< / li > < li class = "chapter-item expanded " > < a href = "federate.html" > Federation< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/index.html" > Configuration< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "usage/configuration/homeserver_sample_config.html" > Homeserver Sample Config File< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/logging_sample_config.html" > Logging Sample Config File< / a > < / li > < li class = "chapter-item expanded " > < a href = "structured_logging.html" > Structured Logging< / a > < / li > < li class = "chapter-item expanded " > < a href = "templates.html" > Templates< / a > < / li > < li class = "chapter-item expanded " > < a href = "usage/configuration/user_authentication/index.html" > User Authentication< / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < div > Single-Sign On< / div > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "openid.html" > OpenID Connect< / a > < / li > < li class = "chapter-item expanded " > < div > SAML< / div > < / li > < li class = "chapter-item expanded " > < div > CAS< / div > < / li > < li class = "chapter-item expanded " > < a href = "sso_mapping_providers.html" > SSO Mapping Providers< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "password_auth_providers.html" > Password Auth Providers< / a > < / li > < li class = "chapter-item expanded " > < a href = "jwt.html" > JSON Web 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 = "development/url_previews.html" > URL Previews< / 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 class = "chapter-item expanded " > < a href = "modules/spam_checker_callbacks.html" > Spam checker callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/third_party_rules_callbacks.html" > Third-party rules callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/presence_router_callbacks.html" > Presence router callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/account_validity_callbacks.html" > Account validity callbacks< / a > < / li > < li class = "chapter-item expanded " > < a href = "modules/porting_legacy_module.html" > Porting a legacy module to the new in
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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 > recaptcha_public_key: YOUR_SITE_KEY
recaptcha_private_key: YOUR_SECRET_KEY
< / code > < / pre >
< / li >
< li > Enable the CAPTCHA for new registrations
< pre > < code > 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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