diff options
Diffstat (limited to 'synapse/rest')
| -rw-r--r-- | synapse/rest/client/v1/login.py | 111 |
1 files changed, 93 insertions, 18 deletions
diff --git a/synapse/rest/client/v1/login.py b/synapse/rest/client/v1/login.py index 24a0ce74f2..abc210da57 100644 --- a/synapse/rest/client/v1/login.py +++ b/synapse/rest/client/v1/login.py @@ -92,8 +92,11 @@ class LoginRestServlet(RestServlet): self.auth_handler = self.hs.get_auth_handler() self.registration_handler = hs.get_registration_handler() self.handlers = hs.get_handlers() + self._clock = hs.get_clock() self._well_known_builder = WellKnownBuilder(hs) self._address_ratelimiter = Ratelimiter() + self._account_ratelimiter = Ratelimiter() + self._failed_attempts_ratelimiter = Ratelimiter() def on_GET(self, request): flows = [] @@ -202,6 +205,16 @@ class LoginRestServlet(RestServlet): # (See add_threepid in synapse/handlers/auth.py) address = address.lower() + # We also apply account rate limiting using the 3PID as a key, as + # otherwise using 3PID bypasses the ratelimiting based on user ID. + self._failed_attempts_ratelimiter.ratelimit( + (medium, address), + time_now_s=self._clock.time(), + rate_hz=self.hs.config.rc_login_failed_attempts.per_second, + burst_count=self.hs.config.rc_login_failed_attempts.burst_count, + update=False, + ) + # Check for login providers that support 3pid login types ( canonical_user_id, @@ -211,7 +224,8 @@ class LoginRestServlet(RestServlet): ) if canonical_user_id: # Authentication through password provider and 3pid succeeded - result = yield self._register_device_with_callback( + + result = yield self._complete_login( canonical_user_id, login_submission, callback_3pid ) return result @@ -225,6 +239,21 @@ class LoginRestServlet(RestServlet): logger.warning( "unknown 3pid identifier medium %s, address %r", medium, address ) + # We mark that we've failed to log in here, as + # `check_password_provider_3pid` might have returned `None` due + # to an incorrect password, rather than the account not + # existing. + # + # If it returned None but the 3PID was bound then we won't hit + # this code path, which is fine as then the per-user ratelimit + # will kick in below. + self._failed_attempts_ratelimiter.can_do_action( + (medium, address), + time_now_s=self._clock.time(), + rate_hz=self.hs.config.rc_login_failed_attempts.per_second, + burst_count=self.hs.config.rc_login_failed_attempts.burst_count, + update=True, + ) raise LoginError(403, "", errcode=Codes.FORBIDDEN) identifier = {"type": "m.id.user", "user": user_id} @@ -236,29 +265,84 @@ class LoginRestServlet(RestServlet): if "user" not in identifier: raise SynapseError(400, "User identifier is missing 'user' key") - canonical_user_id, callback = yield self.auth_handler.validate_login( - identifier["user"], login_submission + if identifier["user"].startswith("@"): + qualified_user_id = identifier["user"] + else: + qualified_user_id = UserID(identifier["user"], self.hs.hostname).to_string() + + # Check if we've hit the failed ratelimit (but don't update it) + self._failed_attempts_ratelimiter.ratelimit( + qualified_user_id.lower(), + time_now_s=self._clock.time(), + rate_hz=self.hs.config.rc_login_failed_attempts.per_second, + burst_count=self.hs.config.rc_login_failed_attempts.burst_count, + update=False, ) - result = yield self._register_device_with_callback( + try: + canonical_user_id, callback = yield self.auth_handler.validate_login( + identifier["user"], login_submission + ) + except LoginError: + # The user has failed to log in, so we need to update the rate + # limiter. Using `can_do_action` avoids us raising a ratelimit + # exception and masking the LoginError. The actual ratelimiting + # should have happened above. + self._failed_attempts_ratelimiter.can_do_action( + qualified_user_id.lower(), + time_now_s=self._clock.time(), + rate_hz=self.hs.config.rc_login_failed_attempts.per_second, + burst_count=self.hs.config.rc_login_failed_attempts.burst_count, + update=True, + ) + raise + + result = yield self._complete_login( canonical_user_id, login_submission, callback ) return result @defer.inlineCallbacks - def _register_device_with_callback(self, user_id, login_submission, callback=None): - """ Registers a device with a given user_id. Optionally run a callback - function after registration has completed. + def _complete_login( + self, user_id, login_submission, callback=None, create_non_existant_users=False + ): + """Called when we've successfully authed the user and now need to + actually login them in (e.g. create devices). This gets called on + all succesful logins. + + Applies the ratelimiting for succesful login attempts against an + account. Args: user_id (str): ID of the user to register. login_submission (dict): Dictionary of login information. callback (func|None): Callback function to run after registration. + create_non_existant_users (bool): Whether to create the user if + they don't exist. Defaults to False. Returns: result (Dict[str,str]): Dictionary of account information after successful registration. """ + + # Before we actually log them in we check if they've already logged in + # too often. This happens here rather than before as we don't + # necessarily know the user before now. + self._account_ratelimiter.ratelimit( + user_id.lower(), + time_now_s=self._clock.time(), + rate_hz=self.hs.config.rc_login_account.per_second, + burst_count=self.hs.config.rc_login_account.burst_count, + update=True, + ) + + if create_non_existant_users: + user_id = yield self.auth_handler.check_user_exists(user_id) + if not user_id: + user_id = yield self.registration_handler.register_user( + localpart=UserID.from_string(user_id).localpart + ) + device_id = login_submission.get("device_id") initial_display_name = login_submission.get("initial_device_display_name") device_id, access_token = yield self.registration_handler.register_device( @@ -285,7 +369,7 @@ class LoginRestServlet(RestServlet): token ) - result = yield self._register_device_with_callback(user_id, login_submission) + result = yield self._complete_login(user_id, login_submission) return result @defer.inlineCallbacks @@ -313,16 +397,7 @@ class LoginRestServlet(RestServlet): raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED) user_id = UserID(user, self.hs.hostname).to_string() - - registered_user_id = yield self.auth_handler.check_user_exists(user_id) - if not registered_user_id: - registered_user_id = yield self.registration_handler.register_user( - localpart=user - ) - - result = yield self._register_device_with_callback( - registered_user_id, login_submission - ) + result = yield self._complete_login(user_id, login_submission) return result |