From 251e6c1210087069a6133140519de80a4ddf218a Mon Sep 17 00:00:00 2001
From: Neil Johnson <neil@matrix.org>
Date: Mon, 30 Jul 2018 15:55:57 +0100
Subject: limit register and sign in on number of monthly users

---
 synapse/handlers/auth.py     | 13 +++++++++++++
 synapse/handlers/register.py | 18 ++++++++++++++++--
 2 files changed, 29 insertions(+), 2 deletions(-)

(limited to 'synapse/handlers')

diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 402e44cdef..f3734f11bd 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -519,6 +519,7 @@ class AuthHandler(BaseHandler):
         """
         logger.info("Logging in user %s on device %s", user_id, device_id)
         access_token = yield self.issue_access_token(user_id, device_id)
+        self._check_mau_limits()
 
         # the device *should* have been registered before we got here; however,
         # it's possible we raced against a DELETE operation. The thing we
@@ -729,6 +730,7 @@ class AuthHandler(BaseHandler):
         defer.returnValue(access_token)
 
     def validate_short_term_login_token_and_get_user_id(self, login_token):
+        self._check_mau_limits()
         auth_api = self.hs.get_auth()
         try:
             macaroon = pymacaroons.Macaroon.deserialize(login_token)
@@ -892,6 +894,17 @@ class AuthHandler(BaseHandler):
         else:
             return defer.succeed(False)
 
+    def _check_mau_limits(self):
+        """
+        Ensure that if mau blocking is enabled that invalid users cannot
+        log in.
+        """
+        if self.hs.config.limit_usage_by_mau is True:
+            current_mau = self.store.count_monthly_users()
+            if current_mau >= self.hs.config.max_mau_value:
+                raise AuthError(
+                        403, "MAU Limit Exceeded", errcode=Codes.MAU_LIMIT_EXCEEDED
+                )
 
 @attr.s
 class MacaroonGenerator(object):
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 7caff0cbc8..f46b8355c0 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -45,7 +45,7 @@ class RegistrationHandler(BaseHandler):
             hs (synapse.server.HomeServer):
         """
         super(RegistrationHandler, self).__init__(hs)
-
+        self.hs = hs
         self.auth = hs.get_auth()
         self._auth_handler = hs.get_auth_handler()
         self.profile_handler = hs.get_profile_handler()
@@ -144,6 +144,7 @@ class RegistrationHandler(BaseHandler):
         Raises:
             RegistrationError if there was a problem registering.
         """
+        self._check_mau_limits()
         password_hash = None
         if password:
             password_hash = yield self.auth_handler().hash(password)
@@ -288,6 +289,7 @@ class RegistrationHandler(BaseHandler):
                 400,
                 "User ID can only contain characters a-z, 0-9, or '=_-./'",
             )
+        self._check_mau_limits()
         user = UserID(localpart, self.hs.hostname)
         user_id = user.to_string()
 
@@ -437,7 +439,7 @@ class RegistrationHandler(BaseHandler):
         """
         if localpart is None:
             raise SynapseError(400, "Request must include user id")
-
+        self._check_mau_limits()
         need_register = True
 
         try:
@@ -531,3 +533,15 @@ class RegistrationHandler(BaseHandler):
             remote_room_hosts=remote_room_hosts,
             action="join",
         )
+
+    def _check_mau_limits(self):
+        """
+        Do not accept registrations if monthly active user limits exceeded
+         and limiting is enabled
+        """
+        if self.hs.config.limit_usage_by_mau is True:
+            current_mau = self.store.count_monthly_users()
+            if current_mau >= self.hs.config.max_mau_value:
+                raise RegistrationError(
+                    403, "MAU Limit Exceeded", Codes.MAU_LIMIT_EXCEEDED
+                )
-- 
cgit 1.4.1