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-rw-r--r--synapse/handlers/auth.py11
-rw-r--r--synapse/handlers/register.py5
2 files changed, 8 insertions, 8 deletions
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index a2866af431..20aaec36a4 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -538,14 +538,15 @@ class AuthHandler(BaseHandler):
                                                    device_id)
         defer.returnValue(refresh_token)
 
-    def generate_access_token(self, user_id, extra_caveats=None,
-                              duration_in_ms=(60 * 60 * 1000)):
+    def generate_access_token(self, user_id, extra_caveats=None):
         extra_caveats = extra_caveats or []
         macaroon = self._generate_base_macaroon(user_id)
         macaroon.add_first_party_caveat("type = access")
-        now = self.hs.get_clock().time_msec()
-        expiry = now + duration_in_ms
-        macaroon.add_first_party_caveat("time < %d" % (expiry,))
+        # Include a nonce, to make sure that each login gets a different
+        # access token.
+        macaroon.add_first_party_caveat("nonce = %s" % (
+            stringutils.random_string_with_symbols(16),
+        ))
         for caveat in extra_caveats:
             macaroon.add_first_party_caveat(caveat)
         return macaroon.serialize()
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 7e119f13b1..886fec8701 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -369,7 +369,7 @@ class RegistrationHandler(BaseHandler):
         defer.returnValue(data)
 
     @defer.inlineCallbacks
-    def get_or_create_user(self, requester, localpart, displayname, duration_in_ms,
+    def get_or_create_user(self, requester, localpart, displayname,
                            password_hash=None):
         """Creates a new user if the user does not exist,
         else revokes all previous access tokens and generates a new one.
@@ -399,8 +399,7 @@ class RegistrationHandler(BaseHandler):
 
         user = UserID(localpart, self.hs.hostname)
         user_id = user.to_string()
-        token = self.auth_handler().generate_access_token(
-            user_id, None, duration_in_ms)
+        token = self.auth_handler().generate_access_token(user_id)
 
         if need_register:
             yield self.store.register(