Rate limit joins per-room (#13276)

1 files changed, 7 insertions, 0 deletions

diff --git a/synapse/config/ratelimiting.py b/synapse/config/ratelimiting.py

index 4fc1784efe..5a91917b4a 100644
--- a/synapse/config/ratelimiting.py
+++ b/synapse/config/ratelimiting.py
@@ -112,6 +112,13 @@ class RatelimitConfig(Config):
             defaults={"per_second": 0.01, "burst_count": 10},
         )
 
+        # Track the rate of joins to a given room. If there are too many, temporarily
+        # prevent local joins and remote joins via this server.
+        self.rc_joins_per_room = RateLimitConfig(
+            config.get("rc_joins_per_room", {}),
+            defaults={"per_second": 1, "burst_count": 10},
+        )
+
         # Ratelimit cross-user key requests:
         # * For local requests this is keyed by the sending device.
         # * For requests received over federation this is keyed by the origin.