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-rw-r--r--changelog.d/5782.removal1
-rw-r--r--docs/sample_config.yaml4
-rw-r--r--synapse/api/auth.py28
-rw-r--r--synapse/config/key.py6
-rw-r--r--synapse/handlers/auth.py2
-rw-r--r--tests/handlers/test_register.py2
-rw-r--r--tests/server_notices/test_resource_limits_server_notices.py2
-rw-r--r--tests/utils.py1
8 files changed, 9 insertions, 37 deletions
diff --git a/changelog.d/5782.removal b/changelog.d/5782.removal
new file mode 100644
index 0000000000..658bf923ab
--- /dev/null
+++ b/changelog.d/5782.removal
@@ -0,0 +1 @@
+Remove non-functional 'expire_access_token' setting.
diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml
index b92959692d..08316597fa 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -942,10 +942,6 @@ uploads_path: "DATADIR/uploads"
 #
 # macaroon_secret_key: <PRIVATE STRING>
 
-# Used to enable access token expiration.
-#
-#expire_access_token: False
-
 # a secret which is used to calculate HMACs for form values, to stop
 # falsification of values. Must be specified for the User Consent
 # forms to work.
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 351790cca4..179644852a 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -410,21 +410,16 @@ class Auth(object):
         try:
             user_id = self.get_user_id_from_macaroon(macaroon)
 
-            has_expiry = False
             guest = False
             for caveat in macaroon.caveats:
-                if caveat.caveat_id.startswith("time "):
-                    has_expiry = True
-                elif caveat.caveat_id == "guest = true":
+                if caveat.caveat_id == "guest = true":
                     guest = True
 
-            self.validate_macaroon(
-                macaroon, rights, self.hs.config.expire_access_token, user_id=user_id
-            )
+            self.validate_macaroon(macaroon, rights, user_id=user_id)
         except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
             raise InvalidClientTokenError("Invalid macaroon passed.")
 
-        if not has_expiry and rights == "access":
+        if rights == "access":
             self.token_cache[token] = (user_id, guest)
 
         return user_id, guest
@@ -450,7 +445,7 @@ class Auth(object):
                 return caveat.caveat_id[len(user_prefix) :]
         raise InvalidClientTokenError("No user caveat in macaroon")
 
-    def validate_macaroon(self, macaroon, type_string, verify_expiry, user_id):
+    def validate_macaroon(self, macaroon, type_string, user_id):
         """
         validate that a Macaroon is understood by and was signed by this server.
 
@@ -458,7 +453,6 @@ class Auth(object):
             macaroon(pymacaroons.Macaroon): The macaroon to validate
             type_string(str): The kind of token required (e.g. "access",
                               "delete_pusher")
-            verify_expiry(bool): Whether to verify whether the macaroon has expired.
             user_id (str): The user_id required
         """
         v = pymacaroons.Verifier()
@@ -471,19 +465,7 @@ class Auth(object):
         v.satisfy_exact("type = " + type_string)
         v.satisfy_exact("user_id = %s" % user_id)
         v.satisfy_exact("guest = true")
-
-        # verify_expiry should really always be True, but there exist access
-        # tokens in the wild which expire when they should not, so we can't
-        # enforce expiry yet (so we have to allow any caveat starting with
-        # 'time < ' in access tokens).
-        #
-        # On the other hand, short-term login tokens (as used by CAS login, for
-        # example) have an expiry time which we do want to enforce.
-
-        if verify_expiry:
-            v.satisfy_general(self._verify_expiry)
-        else:
-            v.satisfy_general(lambda c: c.startswith("time < "))
+        v.satisfy_general(self._verify_expiry)
 
         # access_tokens include a nonce for uniqueness: any value is acceptable
         v.satisfy_general(lambda c: c.startswith("nonce = "))
diff --git a/synapse/config/key.py b/synapse/config/key.py
index 8fc74f9cdf..fe8386985c 100644
--- a/synapse/config/key.py
+++ b/synapse/config/key.py
@@ -116,8 +116,6 @@ class KeyConfig(Config):
             seed = bytes(self.signing_key[0])
             self.macaroon_secret_key = hashlib.sha256(seed).digest()
 
-        self.expire_access_token = config.get("expire_access_token", False)
-
         # a secret which is used to calculate HMACs for form values, to stop
         # falsification of values
         self.form_secret = config.get("form_secret", None)
@@ -144,10 +142,6 @@ class KeyConfig(Config):
         #
         %(macaroon_secret_key)s
 
-        # Used to enable access token expiration.
-        #
-        #expire_access_token: False
-
         # a secret which is used to calculate HMACs for form values, to stop
         # falsification of values. Must be specified for the User Consent
         # forms to work.
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 05be5b7c48..0f3ebf7ef8 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -860,7 +860,7 @@ class AuthHandler(BaseHandler):
         try:
             macaroon = pymacaroons.Macaroon.deserialize(login_token)
             user_id = auth_api.get_user_id_from_macaroon(macaroon)
-            auth_api.validate_macaroon(macaroon, "login", True, user_id)
+            auth_api.validate_macaroon(macaroon, "login", user_id)
         except Exception:
             raise AuthError(403, "Invalid token", errcode=Codes.FORBIDDEN)
         self.ratelimit_login_per_account(user_id)
diff --git a/tests/handlers/test_register.py b/tests/handlers/test_register.py
index 99dce45cfe..0ad0a88165 100644
--- a/tests/handlers/test_register.py
+++ b/tests/handlers/test_register.py
@@ -44,7 +44,7 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
         hs_config["max_mau_value"] = 50
         hs_config["limit_usage_by_mau"] = True
 
-        hs = self.setup_test_homeserver(config=hs_config, expire_access_token=True)
+        hs = self.setup_test_homeserver(config=hs_config)
         return hs
 
     def prepare(self, reactor, clock, hs):
diff --git a/tests/server_notices/test_resource_limits_server_notices.py b/tests/server_notices/test_resource_limits_server_notices.py
index 984feb623f..cdf89e3383 100644
--- a/tests/server_notices/test_resource_limits_server_notices.py
+++ b/tests/server_notices/test_resource_limits_server_notices.py
@@ -36,7 +36,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
             "room_name": "Server Notices",
         }
 
-        hs = self.setup_test_homeserver(config=hs_config, expire_access_token=True)
+        hs = self.setup_test_homeserver(config=hs_config)
         return hs
 
     def prepare(self, reactor, clock, hs):
diff --git a/tests/utils.py b/tests/utils.py
index 6350646263..f1eb9a545c 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -126,7 +126,6 @@ def default_config(name, parse=False):
         "enable_registration": True,
         "enable_registration_captcha": False,
         "macaroon_secret_key": "not even a little secret",
-        "expire_access_token": False,
         "trusted_third_party_id_servers": [],
         "room_invite_state_types": [],
         "password_providers": [],