diff options
| -rw-r--r-- | changelog.d/5198.bugfix | 1 | ||||
| -rw-r--r-- | synapse/api/constants.py | 3 | ||||
| -rw-r--r-- | synapse/handlers/register.py | 11 | ||||
| -rw-r--r-- | tests/handlers/test_register.py | 7 |
4 files changed, 21 insertions, 1 deletions
diff --git a/changelog.d/5198.bugfix b/changelog.d/5198.bugfix new file mode 100644 index 0000000000..c6b156f17d --- /dev/null +++ b/changelog.d/5198.bugfix @@ -0,0 +1 @@ +Prevent registration for user ids that are to long to fit into a state key. Contributed by Reid Anderson. \ No newline at end of file diff --git a/synapse/api/constants.py b/synapse/api/constants.py index 8547a63535..c7bf95b426 100644 --- a/synapse/api/constants.py +++ b/synapse/api/constants.py @@ -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): diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py index a51d11a257..e83ee24f10 100644 --- a/synapse/handlers/register.py +++ b/synapse/handlers/register.py @@ -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: diff --git a/tests/handlers/test_register.py b/tests/handlers/test_register.py index 1c253d0579..5ffba2ca7a 100644 --- a/tests/handlers/test_register.py +++ b/tests/handlers/test_register.py @@ -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 + ) |