From 76b18df3d95cd881017a9aa5c8473409928faecd Mon Sep 17 00:00:00 2001 From: Erik Johnston Date: Wed, 6 Jul 2016 11:16:10 +0100 Subject: [PATCH] Check that there are no null bytes in user and passsword --- synapse/rest/client/v1/register.py | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/synapse/rest/client/v1/register.py b/synapse/rest/client/v1/register.py index 83872f5f6..ce7099b18 100644 --- a/synapse/rest/client/v1/register.py +++ b/synapse/rest/client/v1/register.py @@ -327,6 +327,12 @@ class RegisterRestServlet(ClientV1RestServlet): password = register_json["password"].encode("utf-8") admin = register_json.get("admin", None) + # Its important to check as we use null bytes as HMAC field separators + if "\x00" in user: + raise SynapseError(400, "Invalid user") + if "\x00" in password: + raise SynapseError(400, "Invalid password") + # str() because otherwise hmac complains that 'unicode' does not # have the buffer interface got_mac = str(register_json["mac"])