Enforce validity period on server_keys for fed requests. (#5321)

When handling incoming federation requests, make sure that we have an
up-to-date copy of the signing key.

We do not yet enforce the validity period for event signatures.

2 files changed, 5 insertions, 3 deletions

diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py

index cffa831d80..4b38f7c759 100644
--- a/synapse/federation/federation_base.py
+++ b/synapse/federation/federation_base.py
@@ -265,7 +265,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
     ]
 
     more_deferreds = keyring.verify_json_objects_for_server([
-        (p.sender_domain, p.redacted_pdu_json)
+        (p.sender_domain, p.redacted_pdu_json, 0)
         for p in pdus_to_check_sender
     ])
 
@@ -298,7 +298,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus):
         ]
 
         more_deferreds = keyring.verify_json_objects_for_server([
-            (get_domain_from_id(p.pdu.event_id), p.redacted_pdu_json)
+            (get_domain_from_id(p.pdu.event_id), p.redacted_pdu_json, 0)
             for p in pdus_to_check_event_id
         ])
 
diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py

index d0efc4e0d3..0db8858cf1 100644
--- a/synapse/federation/transport/server.py
+++ b/synapse/federation/transport/server.py
@@ -94,6 +94,7 @@ class NoAuthenticationError(AuthenticationError):
 
 class Authenticator(object):
     def __init__(self, hs):
+        self._clock = hs.get_clock()
         self.keyring = hs.get_keyring()
         self.server_name = hs.hostname
         self.store = hs.get_datastore()
@@ -102,6 +103,7 @@ class Authenticator(object):
     # A method just so we can pass 'self' as the authenticator to the Servlets
     @defer.inlineCallbacks
     def authenticate_request(self, request, content):
+        now = self._clock.time_msec()
         json_request = {
             "method": request.method.decode('ascii'),
             "uri": request.uri.decode('ascii'),
@@ -138,7 +140,7 @@ class Authenticator(object):
                 401, "Missing Authorization headers", Codes.UNAUTHORIZED,
             )
 
-        yield self.keyring.verify_json_for_server(origin, json_request)
+        yield self.keyring.verify_json_for_server(origin, json_request, now)
 
         logger.info("Request from %s", origin)
         request.authenticated_entity = origin