Limit UserIds to a length that fits in a state key (#5198)

This commit is contained in:
ReidAnderson 2019-05-20 05:20:08 -05:00 committed by Richard van der Hoff
parent 291e1eea5e
commit 3787133c9e
4 changed files with 21 additions and 1 deletions

1
changelog.d/5198.bugfix Normal file
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@ -0,0 +1 @@
Prevent registration for user ids that are to long to fit into a state key. Contributed by Reid Anderson.

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@ -23,6 +23,9 @@ MAX_DEPTH = 2**63 - 1
# the maximum length for a room alias is 255 characters
MAX_ALIAS_LENGTH = 255
# the maximum length for a user id is 255 characters
MAX_USERID_LENGTH = 255
class Membership(object):

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@ -19,7 +19,7 @@ import logging
from twisted.internet import defer
from synapse import types
from synapse.api.constants import LoginType
from synapse.api.constants import MAX_USERID_LENGTH, LoginType
from synapse.api.errors import (
AuthError,
Codes,
@ -123,6 +123,15 @@ class RegistrationHandler(BaseHandler):
self.check_user_id_not_appservice_exclusive(user_id)
if len(user_id) > MAX_USERID_LENGTH:
raise SynapseError(
400,
"User ID may not be longer than %s characters" % (
MAX_USERID_LENGTH,
),
Codes.INVALID_USERNAME
)
users = yield self.store.get_users_by_id_case_insensitive(user_id)
if users:
if not guest_access_token:

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@ -228,3 +228,10 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
def test_register_not_support_user(self):
res = self.get_success(self.handler.register(localpart='user'))
self.assertFalse(self.store.is_support_user(res[0]))
def test_invalid_user_id_length(self):
invalid_user_id = "x" * 256
self.get_failure(
self.handler.register(localpart=invalid_user_id),
SynapseError
)