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Add failed auth ratelimiting to UIA

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This commit is contained in:
Erik Johnston 2019-11-06 11:00:54 +00:00
parent 541f1b92d9
commit f697b4b4a2
1 changed files with 32 additions and 1 deletions
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33
synapse/handlers/auth.py
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@ -35,6 +35,7 @@ from synapse.api.errors import (
SynapseError,
UserDeactivatedError,
)
from synapse.api.ratelimiting import Ratelimiter
from synapse.handlers.ui_auth import INTERACTIVE_AUTH_CHECKERS
from synapse.handlers.ui_auth.checkers import UserInteractiveAuthChecker
from synapse.logging.context import defer_to_thread
@ -101,6 +102,10 @@ class AuthHandler(BaseHandler):
login_types.append(t)
self._supported_login_types = login_types
# Ratelimiter for failed auth during UIA. Uses same ratelimit config
# as per `rc_login.failed_attempts`.
self._failed_uia_attempts_ratelimiter = Ratelimiter()
self._clock = self.hs.get_clock()
@defer.inlineCallbacks
@ -129,12 +134,38 @@ class AuthHandler(BaseHandler):
AuthError if the client has completed a login flow, and it gives
a different user to `requester`
LimitExceededError if the ratelimiter's failed requests count for this
user is too high too proceed
"""
user_id = requester.user.to_string()
# Check if we should be ratelimited due to too many previous failed attempts
self._failed_uia_attempts_ratelimiter.ratelimit(
user_id,
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,
)
# build a list of supported flows
flows = [[login_type] for login_type in self._supported_login_types]
result, params, _ = yield self.check_auth(flows, request_body, clientip)
try:
result, params, _ = yield self.check_auth(flows, request_body, clientip)
except LoginError:
# Update the ratelimite to say we failed (`can_do_action` doesn't raise).
self._failed_uia_attempts_ratelimiter.can_do_action(
user_id,
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
# find the completed login type
for login_type in self._supported_login_types: