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-rw-r--r--synapse/rest/client/v1/register.py6
1 files changed, 3 insertions, 3 deletions
diff --git a/synapse/rest/client/v1/register.py b/synapse/rest/client/v1/register.py
index 86519fd9dd..ccc457924b 100644
--- a/synapse/rest/client/v1/register.py
+++ b/synapse/rest/client/v1/register.py
@@ -316,11 +316,11 @@ class RegisterRestServlet(ClientV1RestServlet):
     def _do_shared_secret(self, request, register_json, session):
         yield run_on_reactor()
 
-        if "mac" not in register_json:
+        if not isinstance(register_json.get("mac", None), basestring):
             raise SynapseError(400, "Expected mac.")
-        if "user" not in register_json:
+        if not isinstance(register_json.get("user", None), basestring):
             raise SynapseError(400, "Expected 'user' key.")
-        if "password" not in register_json:
+        if not isinstance(register_json.get("password", None), basestring):
             raise SynapseError(400, "Expected 'password' key.")
 
         if not self.hs.config.registration_shared_secret: