diff options
| -rw-r--r-- | synapse/api/auth.py | 38 | ||||
| -rw-r--r-- | synapse/api/constants.py | 6 | ||||
| -rw-r--r-- | synapse/federation/federation_client.py | 39 | ||||
| -rw-r--r-- | synapse/handlers/federation.py | 211 | ||||
| -rw-r--r-- | synapse/storage/rejections.py | 10 | ||||
| -rw-r--r-- | synapse/storage/schema/im.sql | 1 |
6 files changed, 253 insertions, 52 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py index a342a0e0da..461faa8c78 100644 --- a/synapse/api/auth.py +++ b/synapse/api/auth.py @@ -353,9 +353,23 @@ class Auth(object): def add_auth_events(self, builder, context): yield run_on_reactor() - if builder.type == EventTypes.Create: - builder.auth_events = [] - return + auth_ids = self.compute_auth_events(builder, context) + + auth_events_entries = yield self.store.add_event_hashes( + auth_ids + ) + + builder.auth_events = auth_events_entries + + context.auth_events = { + k: v + for k, v in context.current_state.items() + if v.event_id in auth_ids + } + + def compute_auth_events(self, event, context): + if event.type == EventTypes.Create: + return [] auth_ids = [] @@ -368,7 +382,7 @@ class Auth(object): key = (EventTypes.JoinRules, "", ) join_rule_event = context.current_state.get(key) - key = (EventTypes.Member, builder.user_id, ) + key = (EventTypes.Member, event.user_id, ) member_event = context.current_state.get(key) key = (EventTypes.Create, "", ) @@ -382,8 +396,8 @@ class Auth(object): else: is_public = False - if builder.type == EventTypes.Member: - e_type = builder.content["membership"] + if event.type == EventTypes.Member: + e_type = event.content["membership"] if e_type in [Membership.JOIN, Membership.INVITE]: if join_rule_event: auth_ids.append(join_rule_event.event_id) @@ -398,17 +412,7 @@ class Auth(object): if member_event.content["membership"] == Membership.JOIN: auth_ids.append(member_event.event_id) - auth_events_entries = yield self.store.add_event_hashes( - auth_ids - ) - - builder.auth_events = auth_events_entries - - context.auth_events = { - k: v - for k, v in context.current_state.items() - if v.event_id in auth_ids - } + return auth_ids @log_function def _can_send_event(self, event, auth_events): diff --git a/synapse/api/constants.py b/synapse/api/constants.py index 7ee6dcc46e..0d3fc629af 100644 --- a/synapse/api/constants.py +++ b/synapse/api/constants.py @@ -74,3 +74,9 @@ class EventTypes(object): Message = "m.room.message" Topic = "m.room.topic" Name = "m.room.name" + + +class RejectedReason(object): + AUTH_ERROR = "auth_error" + REPLACED = "replaced" + NOT_ANCESTOR = "not_ancestor" diff --git a/synapse/federation/federation_client.py b/synapse/federation/federation_client.py index 91b44cd8b3..ebcd593506 100644 --- a/synapse/federation/federation_client.py +++ b/synapse/federation/federation_client.py @@ -331,6 +331,45 @@ class FederationClient(object): defer.returnValue(pdu) + @defer.inlineCallbacks + def query_auth(self, destination, room_id, event_id, local_auth): + """ + Params: + destination (str) + event_it (str) + local_auth (list) + """ + time_now = self._clock.time_msec() + + send_content = { + "auth_chain": [e.get_pdu_json(time_now) for e in local_auth], + } + + code, content = yield self.transport_layer.send_invite( + destination=destination, + room_id=room_id, + event_id=event_id, + content=send_content, + ) + + auth_chain = [ + (yield self._check_sigs_and_hash(self.event_from_pdu_json(e))) + for e in content["auth_chain"] + ] + + missing = [ + (yield self._check_sigs_and_hash(self.event_from_pdu_json(e))) + for e in content.get("missing", []) + ] + + ret = { + "auth_chain": auth_chain, + "rejects": content.get("rejects", []), + "missing": missing, + } + + defer.returnValue(ret) + def event_from_pdu_json(self, pdu_json, outlier=False): event = FrozenEvent( pdu_json diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py index bcdcc90a18..97e3c503b9 100644 --- a/synapse/handlers/federation.py +++ b/synapse/handlers/federation.py @@ -17,19 +17,16 @@ from ._base import BaseHandler -from synapse.events.utils import prune_event from synapse.api.errors import ( - AuthError, FederationError, SynapseError, StoreError, + AuthError, FederationError, StoreError, ) -from synapse.api.constants import EventTypes, Membership +from synapse.api.constants import EventTypes, Membership, RejectedReason from synapse.util.logutils import log_function from synapse.util.async import run_on_reactor from synapse.crypto.event_signing import ( - compute_event_signature, check_event_content_hash, - add_hashes_and_signatures, + compute_event_signature, add_hashes_and_signatures, ) from synapse.types import UserID -from syutil.jsonutil import encode_canonical_json from twisted.internet import defer @@ -113,33 +110,6 @@ class FederationHandler(BaseHandler): logger.debug("Processing event: %s", event.event_id) - redacted_event = prune_event(event) - - redacted_pdu_json = redacted_event.get_pdu_json() - try: - yield self.keyring.verify_json_for_server( - event.origin, redacted_pdu_json - ) - except SynapseError as e: - logger.warn( - "Signature check failed for %s redacted to %s", - encode_canonical_json(pdu.get_pdu_json()), - encode_canonical_json(redacted_pdu_json), - ) - raise FederationError( - "ERROR", - e.code, - e.msg, - affected=event.event_id, - ) - - if not check_event_content_hash(event): - logger.warn( - "Event content has been tampered, redacting %s, %s", - event.event_id, encode_canonical_json(event.get_dict()) - ) - event = redacted_event - logger.debug("Event: %s", event) # FIXME (erikj): Awful hack to make the case where we are not currently @@ -180,7 +150,6 @@ class FederationHandler(BaseHandler): if state: for e in state: - logging.info("A :) %r", e) e.internal_metadata.outlier = True try: yield self._handle_new_event(e) @@ -747,7 +716,20 @@ class FederationHandler(BaseHandler): event.event_id, event.signatures, ) - self.auth.check(event, auth_events=context.auth_events) + try: + self.auth.check(event, auth_events=context.auth_events) + except AuthError: + # TODO: Store rejection. + context.rejected = RejectedReason.AUTH_ERROR + + yield self.store.persist_event( + event, + context=context, + backfilled=backfilled, + is_new_state=False, + current_state=current_state, + ) + raise logger.debug( "_handle_new_event: Before persist_event: %s, sigs: %s", @@ -768,3 +750,162 @@ class FederationHandler(BaseHandler): ) defer.returnValue(context) + + @defer.inlineCallbacks + def do_auth(self, origin, event, context): + for e_id, _ in event.auth_events: + pass + + auth_events = set(e_id for e_id, _ in event.auth_events) + current_state = set(e.event_id for e in context.auth_events.values()) + + missing_auth = auth_events - current_state + + if missing_auth: + # Do auth conflict res. + + # 1. Get what we think is the auth chain. + auth_ids = self.auth.compute_auth_events(event, context) + local_auth_chain = yield self.store.get_auth_chain(auth_ids) + + # 2. Get remote difference. + result = yield self.replication_layer.query_auth( + origin, + event.room_id, + event.event_id, + local_auth_chain, + ) + + # 3. Process any remote auth chain events we haven't seen. + for e in result.get("missing", []): + # TODO. + pass + + # 4. Look at rejects and their proofs. + # TODO. + + try: + self.auth.check(event, auth_events=context.auth_events) + except AuthError: + raise + + @defer.inlineCallbacks + def construct_auth_difference(self, local_auth, remote_auth): + """ Given a local and remote auth chain, find the differences. This + assumes that we have already processed all events in remote_auth + + Params: + local_auth (list) + remote_auth (list) + + Returns: + dict + """ + + # TODO: Make sure we are OK with local_auth or remote_auth having more + # auth events in them than strictly necessary. + + def sort_fun(ev): + return ev.depth, ev.event_id + + # We find the differences by starting at the "bottom" of each list + # and iterating up on both lists. The lists are ordered by depth and + # then event_id, we iterate up both lists until we find the event ids + # don't match. Then we look at depth/event_id to see which side is + # missing that event, and iterate only up that list. Repeat. + + remote_list = list(remote_auth) + remote_list.sort(key=sort_fun) + + local_list = list(local_auth) + local_list.sort(key=sort_fun) + + local_iter = iter(local_list) + remote_iter = iter(remote_list) + + current_local = local_iter.next() + current_remote = remote_iter.next() + + def get_next(it, opt=None): + return it.next() if it.has_next() else opt + + missing_remotes = [] + missing_locals = [] + while current_local and current_remote: + if current_remote is None: + missing_locals.append(current_local) + current_local = get_next(local_iter) + continue + + if current_local is None: + missing_remotes.append(current_remote) + current_remote = get_next(remote_iter) + continue + + if current_local.event_id == current_remote.event_id: + current_local = get_next(local_iter) + current_remote = get_next(remote_iter) + continue + + if current_local.depth < current_remote.depth: + missing_locals.append(current_local) + current_local = get_next(local_iter) + continue + + if current_local.depth > current_remote.depth: + missing_remotes.append(current_remote) + current_remote = get_next(remote_iter) + continue + + # They have the same depth, so we fall back to the event_id order + if current_local.event_id < current_remote.event_id: + missing_locals.append(current_local) + current_local = get_next(local_iter) + + if current_local.event_id > current_remote.event_id: + missing_remotes.append(current_remote) + current_remote = get_next(remote_iter) + continue + + # missing locals should be sent to the server + # We should find why we are missing remotes, as they will have been + # rejected. + + # Remove events from missing_remotes if they are referencing a missing + # remote. We only care about the "root" rejected ones. + missing_remote_ids = [e.event_id for e in missing_remotes] + base_remote_rejected = list(missing_remotes) + for e in missing_remotes: + for e_id, _ in e.auth_events: + if e_id in missing_remote_ids: + base_remote_rejected.remove(e) + + reason_map = {} + + for e in base_remote_rejected: + reason = yield self.store.get_rejection_reason(e.event_id) + if reason is None: + # FIXME: ERRR?! + raise RuntimeError("") + + reason_map[e.event_id] = reason + + if reason == RejectedReason.AUTH_ERROR: + pass + elif reason == RejectedReason.REPLACED: + # TODO: Get proof + pass + elif reason == RejectedReason.NOT_ANCESTOR: + # TODO: Get proof. + pass + + defer.returnValue({ + "rejects": { + e.event_id: { + "reason": reason_map[e.event_id], + "proof": None, + } + for e in base_remote_rejected + }, + "missing": missing_locals, + }) diff --git a/synapse/storage/rejections.py b/synapse/storage/rejections.py index 7d38b31f44..b7249700d7 100644 --- a/synapse/storage/rejections.py +++ b/synapse/storage/rejections.py @@ -31,3 +31,13 @@ class RejectionsStore(SQLBaseStore): "last_failure": self._clock.time_msec(), } ) + + def get_rejection_reason(self, event_id): + self._simple_select_one_onecol( + table="rejections", + retcol="reason", + keyvalues={ + "event_id": event_id, + }, + allow_none=True, + ) diff --git a/synapse/storage/schema/im.sql b/synapse/storage/schema/im.sql index bc7c6b6ed5..5866a387f6 100644 --- a/synapse/storage/schema/im.sql +++ b/synapse/storage/schema/im.sql @@ -128,5 +128,6 @@ CREATE TABLE IF NOT EXISTS rejections( event_id TEXT NOT NULL, reason TEXT NOT NULL, last_check TEXT NOT NULL, + root_rejected TEXT, CONSTRAINT ev_id UNIQUE (event_id) ON CONFLICT REPLACE ); |