diff options
| -rw-r--r-- | CHANGES.md | 17 | ||||
| -rw-r--r-- | synapse/federation/federation_base.py | 126 | ||||
| -rw-r--r-- | synapse/federation/federation_server.py | 20 | ||||
| -rw-r--r-- | synapse/federation/persistence.py | 8 | ||||
| -rw-r--r-- | synapse/federation/transport/server.py | 2 | ||||
| -rw-r--r-- | tests/handlers/test_typing.py | 19 | ||||
| -rw-r--r-- | tests/utils.py | 12 |
7 files changed, 158 insertions, 46 deletions
diff --git a/CHANGES.md b/CHANGES.md index c2b1e70488..4db47da3e3 100644 --- a/CHANGES.md +++ b/CHANGES.md @@ -1,3 +1,19 @@ +Synapse 0.33.3.1 (2018-09-06) +============================= + +SECURITY FIXES +-------------- + +- Fix an issue where event signatures were not always correctly validated ([\#3796](https://github.com/matrix-org/synapse/issues/3796)) +- Fix an issue where server_acls could be circumvented for incoming events ([\#3796](https://github.com/matrix-org/synapse/issues/3796)) + + +Internal Changes +---------------- + +- Unignore synctl in .dockerignore to fix docker builds ([\#3802](https://github.com/matrix-org/synapse/issues/3802)) + + Synapse 0.33.4rc1 (2018-09-04) ============================== @@ -24,7 +40,6 @@ Bugfixes - Fix bug in sending presence over federation ([\#3768](https://github.com/matrix-org/synapse/issues/3768)) - Fix bug where preserved threepid user comes to sign up and server is mau blocked ([\#3777](https://github.com/matrix-org/synapse/issues/3777)) - Internal Changes ---------------- diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py index c11798093d..5be8e66fb8 100644 --- a/synapse/federation/federation_base.py +++ b/synapse/federation/federation_base.py @@ -13,17 +13,20 @@ # See the License for the specific language governing permissions and # limitations under the License. import logging +from collections import namedtuple import six from twisted.internet import defer +from twisted.internet.defer import DeferredList -from synapse.api.constants import MAX_DEPTH +from synapse.api.constants import MAX_DEPTH, EventTypes, Membership from synapse.api.errors import Codes, SynapseError from synapse.crypto.event_signing import check_event_content_hash from synapse.events import FrozenEvent from synapse.events.utils import prune_event from synapse.http.servlet import assert_params_in_dict +from synapse.types import get_domain_from_id from synapse.util import logcontext, unwrapFirstError logger = logging.getLogger(__name__) @@ -133,34 +136,25 @@ class FederationBase(object): * throws a SynapseError if the signature check failed. The deferreds run their callbacks in the sentinel logcontext. """ - - redacted_pdus = [ - prune_event(pdu) - for pdu in pdus - ] - - deferreds = self.keyring.verify_json_objects_for_server([ - (p.origin, p.get_pdu_json()) - for p in redacted_pdus - ]) + deferreds = _check_sigs_on_pdus(self.keyring, pdus) ctx = logcontext.LoggingContext.current_context() - def callback(_, pdu, redacted): + def callback(_, pdu): with logcontext.PreserveLoggingContext(ctx): if not check_event_content_hash(pdu): logger.warn( "Event content has been tampered, redacting %s: %s", pdu.event_id, pdu.get_pdu_json() ) - return redacted + return prune_event(pdu) if self.spam_checker.check_event_for_spam(pdu): logger.warn( "Event contains spam, redacting %s: %s", pdu.event_id, pdu.get_pdu_json() ) - return redacted + return prune_event(pdu) return pdu @@ -173,16 +167,116 @@ class FederationBase(object): ) return failure - for deferred, pdu, redacted in zip(deferreds, pdus, redacted_pdus): + for deferred, pdu in zip(deferreds, pdus): deferred.addCallbacks( callback, errback, - callbackArgs=[pdu, redacted], + callbackArgs=[pdu], errbackArgs=[pdu], ) return deferreds +class PduToCheckSig(namedtuple("PduToCheckSig", [ + "pdu", "redacted_pdu_json", "event_id_domain", "sender_domain", "deferreds", +])): + pass + + +def _check_sigs_on_pdus(keyring, pdus): + """Check that the given events are correctly signed + + Args: + keyring (synapse.crypto.Keyring): keyring object to do the checks + pdus (Collection[EventBase]): the events to be checked + + Returns: + List[Deferred]: a Deferred for each event in pdus, which will either succeed if + the signatures are valid, or fail (with a SynapseError) if not. + """ + + # (currently this is written assuming the v1 room structure; we'll probably want a + # separate function for checking v2 rooms) + + # we want to check that the event is signed by: + # + # (a) the server which created the event_id + # + # (b) the sender's server. + # + # - except in the case of invites created from a 3pid invite, which are exempt + # from this check, because the sender has to match that of the original 3pid + # invite, but the event may come from a different HS, for reasons that I don't + # entirely grok (why do the senders have to match? and if they do, why doesn't the + # joining server ask the inviting server to do the switcheroo with + # exchange_third_party_invite?). + # + # That's pretty awful, since redacting such an invite will render it invalid + # (because it will then look like a regular invite without a valid signature), + # and signatures are *supposed* to be valid whether or not an event has been + # redacted. But this isn't the worst of the ways that 3pid invites are broken. + # + # let's start by getting the domain for each pdu, and flattening the event back + # to JSON. + pdus_to_check = [ + PduToCheckSig( + pdu=p, + redacted_pdu_json=prune_event(p).get_pdu_json(), + event_id_domain=get_domain_from_id(p.event_id), + sender_domain=get_domain_from_id(p.sender), + deferreds=[], + ) + for p in pdus + ] + + # first make sure that the event is signed by the event_id's domain + deferreds = keyring.verify_json_objects_for_server([ + (p.event_id_domain, p.redacted_pdu_json) + for p in pdus_to_check + ]) + + for p, d in zip(pdus_to_check, deferreds): + p.deferreds.append(d) + + # now let's look for events where the sender's domain is different to the + # event id's domain (normally only the case for joins/leaves), and add additional + # checks. + pdus_to_check_sender = [ + p for p in pdus_to_check + if p.sender_domain != p.event_id_domain and not _is_invite_via_3pid(p.pdu) + ] + + more_deferreds = keyring.verify_json_objects_for_server([ + (p.sender_domain, p.redacted_pdu_json) + for p in pdus_to_check_sender + ]) + + for p, d in zip(pdus_to_check_sender, more_deferreds): + p.deferreds.append(d) + + # replace lists of deferreds with single Deferreds + return [_flatten_deferred_list(p.deferreds) for p in pdus_to_check] + + +def _flatten_deferred_list(deferreds): + """Given a list of one or more deferreds, either return the single deferred, or + combine into a DeferredList. + """ + if len(deferreds) > 1: + return DeferredList(deferreds, fireOnOneErrback=True, consumeErrors=True) + else: + assert len(deferreds) == 1 + return deferreds[0] + + +def _is_invite_via_3pid(event): + return ( + event.type == EventTypes.Member + and event.membership == Membership.INVITE + and "third_party_invite" in event.content + ) + + def event_from_pdu_json(pdu_json, outlier=False): """Construct a FrozenEvent from an event json received over federation diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py index 3e0cd294a1..547c6aec80 100644 --- a/synapse/federation/federation_server.py +++ b/synapse/federation/federation_server.py @@ -99,7 +99,7 @@ class FederationServer(FederationBase): @defer.inlineCallbacks @log_function - def on_incoming_transaction(self, transaction_data): + def on_incoming_transaction(self, origin, transaction_data): # keep this as early as possible to make the calculated origin ts as # accurate as possible. request_time = self._clock.time_msec() @@ -108,34 +108,33 @@ class FederationServer(FederationBase): if not transaction.transaction_id: raise Exception("Transaction missing transaction_id") - if not transaction.origin: - raise Exception("Transaction missing origin") logger.debug("[%s] Got transaction", transaction.transaction_id) # use a linearizer to ensure that we don't process the same transaction # multiple times in parallel. with (yield self._transaction_linearizer.queue( - (transaction.origin, transaction.transaction_id), + (origin, transaction.transaction_id), )): result = yield self._handle_incoming_transaction( - transaction, request_time, + origin, transaction, request_time, ) defer.returnValue(result) @defer.inlineCallbacks - def _handle_incoming_transaction(self, transaction, request_time): + def _handle_incoming_transaction(self, origin, transaction, request_time): """ Process an incoming transaction and return the HTTP response Args: + origin (unicode): the server making the request transaction (Transaction): incoming transaction request_time (int): timestamp that the HTTP request arrived at Returns: Deferred[(int, object)]: http response code and body """ - response = yield self.transaction_actions.have_responded(transaction) + response = yield self.transaction_actions.have_responded(origin, transaction) if response: logger.debug( @@ -149,7 +148,7 @@ class FederationServer(FederationBase): received_pdus_counter.inc(len(transaction.pdus)) - origin_host, _ = parse_server_name(transaction.origin) + origin_host, _ = parse_server_name(origin) pdus_by_room = {} @@ -190,7 +189,7 @@ class FederationServer(FederationBase): event_id = pdu.event_id try: yield self._handle_received_pdu( - transaction.origin, pdu + origin, pdu ) pdu_results[event_id] = {} except FederationError as e: @@ -212,7 +211,7 @@ class FederationServer(FederationBase): if hasattr(transaction, "edus"): for edu in (Edu(**x) for x in transaction.edus): yield self.received_edu( - transaction.origin, + origin, edu.edu_type, edu.content ) @@ -224,6 +223,7 @@ class FederationServer(FederationBase): logger.debug("Returning: %s", str(response)) yield self.transaction_actions.set_response( + origin, transaction, 200, response ) diff --git a/synapse/federation/persistence.py b/synapse/federation/persistence.py index 9146215c21..74ffd13b4f 100644 --- a/synapse/federation/persistence.py +++ b/synapse/federation/persistence.py @@ -36,7 +36,7 @@ class TransactionActions(object): self.store = datastore @log_function - def have_responded(self, transaction): + def have_responded(self, origin, transaction): """ Have we already responded to a transaction with the same id and origin? @@ -50,11 +50,11 @@ class TransactionActions(object): "transaction_id") return self.store.get_received_txn_response( - transaction.transaction_id, transaction.origin + transaction.transaction_id, origin ) @log_function - def set_response(self, transaction, code, response): + def set_response(self, origin, transaction, code, response): """ Persist how we responded to a transaction. Returns: @@ -66,7 +66,7 @@ class TransactionActions(object): return self.store.set_received_txn_response( transaction.transaction_id, - transaction.origin, + origin, code, response, ) diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index 7a993fd1cf..3972922ff9 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -353,7 +353,7 @@ class FederationSendServlet(BaseFederationServlet): try: code, response = yield self.handler.on_incoming_transaction( - transaction_data + origin, transaction_data, ) except Exception: logger.exception("on_incoming_transaction failed") diff --git a/tests/handlers/test_typing.py b/tests/handlers/test_typing.py index ad58073a14..c2d951b45f 100644 --- a/tests/handlers/test_typing.py +++ b/tests/handlers/test_typing.py @@ -33,7 +33,7 @@ from ..utils import ( ) -def _expect_edu(destination, edu_type, content, origin="test"): +def _expect_edu_transaction(edu_type, content, origin="test"): return { "origin": origin, "origin_server_ts": 1000000, @@ -42,8 +42,8 @@ def _expect_edu(destination, edu_type, content, origin="test"): } -def _make_edu_json(origin, edu_type, content): - return json.dumps(_expect_edu("test", edu_type, content, origin=origin)).encode( +def _make_edu_transaction_json(edu_type, content): + return json.dumps(_expect_edu_transaction(edu_type, content)).encode( 'utf8' ) @@ -190,8 +190,7 @@ class TypingNotificationsTestCase(unittest.TestCase): call( "farm", path="/_matrix/federation/v1/send/1000000/", - data=_expect_edu( - "farm", + data=_expect_edu_transaction( "m.typing", content={ "room_id": self.room_id, @@ -221,11 +220,10 @@ class TypingNotificationsTestCase(unittest.TestCase): self.assertEquals(self.event_source.get_current_key(), 0) - yield self.mock_federation_resource.trigger( + (code, response) = yield self.mock_federation_resource.trigger( "PUT", "/_matrix/federation/v1/send/1000000/", - _make_edu_json( - "farm", + _make_edu_transaction_json( "m.typing", content={ "room_id": self.room_id, @@ -233,7 +231,7 @@ class TypingNotificationsTestCase(unittest.TestCase): "typing": True, }, ), - federation_auth=True, + federation_auth_origin=b'farm', ) self.on_new_event.assert_has_calls( @@ -264,8 +262,7 @@ class TypingNotificationsTestCase(unittest.TestCase): call( "farm", path="/_matrix/federation/v1/send/1000000/", - data=_expect_edu( - "farm", + data=_expect_edu_transaction( "m.typing", content={ "room_id": self.room_id, diff --git a/tests/utils.py b/tests/utils.py index 114470d641..b85017d279 100644 --- a/tests/utils.py +++ b/tests/utils.py @@ -321,7 +321,10 @@ class MockHttpResource(HttpServer): @patch('twisted.web.http.Request') @defer.inlineCallbacks - def trigger(self, http_method, path, content, mock_request, federation_auth=False): + def trigger( + self, http_method, path, content, mock_request, + federation_auth_origin=None, + ): """ Fire an HTTP event. Args: @@ -330,6 +333,7 @@ class MockHttpResource(HttpServer): content : The HTTP body mock_request : Mocked request to pass to the event so it can get content. + federation_auth_origin (bytes|None): domain to authenticate as, for federation Returns: A tuple of (code, response) Raises: @@ -350,8 +354,10 @@ class MockHttpResource(HttpServer): mock_request.getClientIP.return_value = "-" headers = {} - if federation_auth: - headers[b"Authorization"] = [b"X-Matrix origin=test,key=,sig="] + if federation_auth_origin is not None: + headers[b"Authorization"] = [ + b"X-Matrix origin=%s,key=,sig=" % (federation_auth_origin, ) + ] mock_request.requestHeaders.getRawHeaders = mock_getRawHeaders(headers) # return the right path if the event requires it |