diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index ad2b7c9515..0f75e7b9d4 100644
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -351,6 +351,23 @@ def setup(config_options: List[str]) -> SynapseHomeServer:
if config.server.gc_seconds:
synapse.metrics.MIN_TIME_BETWEEN_GCS = config.server.gc_seconds
+ if (
+ config.registration.enable_registration
+ and not config.registration.enable_registration_without_verification
+ ):
+ if (
+ not config.captcha.enable_registration_captcha
+ and not config.registration.registrations_require_3pid
+ and not config.registration.registration_requires_token
+ ):
+
+ raise ConfigError(
+ "You have enabled open registration without any verification. This is a known vector for "
+ "spam and abuse. If you would like to allow public registration, please consider adding email, "
+ "captcha, or token-based verification. Otherwise this check can be removed by setting the "
+ "`enable_registration_without_verification` config option to `true`."
+ )
+
hs = SynapseHomeServer(
config.server.server_name,
config=config,
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index ea9b50fe97..40fb329a7f 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -33,6 +33,10 @@ class RegistrationConfig(Config):
str(config["disable_registration"])
)
+ self.enable_registration_without_verification = strtobool(
+ str(config.get("enable_registration_without_verification", False))
+ )
+
self.registrations_require_3pid = config.get("registrations_require_3pid", [])
self.allowed_local_3pids = config.get("allowed_local_3pids", [])
self.enable_3pid_lookup = config.get("enable_3pid_lookup", True)
@@ -207,10 +211,18 @@ class RegistrationConfig(Config):
# Registration can be rate-limited using the parameters in the "Ratelimiting"
# section of this file.
- # Enable registration for new users.
+ # Enable registration for new users. Defaults to 'false'. It is highly recommended that if you enable registration,
+ # you use either captcha, email, or token-based verification to verify that new users are not bots. In order to enable registration
+ # without any verification, you must also set `enable_registration_without_verification`, found below.
#
#enable_registration: false
+ # Enable registration without email or captcha verification. Note: this option is *not* recommended,
+ # as registration without verification is a known vector for spam and abuse. Defaults to false. Has no effect
+ # unless `enable_registration` is also enabled.
+ #
+ #enable_registration_without_verification: true
+
# Time that a user's session remains valid for, after they log in.
#
# Note that this is not currently compatible with guest logins.
|
