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Initial implementation of auth conflict resolution

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This commit is contained in:
Erik Johnston 2015-01-29 16:50:23 +00:00
parent 5a3a15f5c1
commit 78015948a7
8 changed files with 211 additions and 82 deletions
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6
synapse/events/utils.py
View file

@ -45,12 +45,14 @@ def prune_event(event):
"membership",
]
event_dict = event.get_dict()
new_content = {}
def add_fields(*fields):
for field in fields:
if field in event.content:
new_content[field] = event.content[field]
new_content[field] = event_dict["content"][field]
if event_type == EventTypes.Member:
add_fields("membership")
@ -75,7 +77,7 @@ def prune_event(event):
allowed_fields = {
k: v
for k, v in event.get_dict().items()
for k, v in event_dict.items()
if k in allowed_keys
}

2
synapse/federation/federation_client.py
View file

@ -345,7 +345,7 @@ class FederationClient(object):
"auth_chain": [e.get_pdu_json(time_now) for e in local_auth],
}
code, content = yield self.transport_layer.send_invite(
code, content = yield self.transport_layer.send_query_auth(
destination=destination,
room_id=room_id,
event_id=event_id,

33
synapse/federation/federation_server.py
View file

@ -230,6 +230,39 @@ class FederationServer(object):
"auth_chain": [a.get_pdu_json(time_now) for a in auth_pdus],
}))
@defer.inlineCallbacks
def on_query_auth_request(self, origin, content, event_id):
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 = yield self.handler.on_query_auth(
origin, event_id, auth_chain, content.get("rejects", []), missing
)
time_now = self._clock.time_msec()
send_content = {
"auth_chain": [
e.get_pdu_json(time_now)
for e in ret["auth_chain"]
],
"rejects": content.get("rejects", []),
"missing": [
e.get_pdu_json(time_now)
for e in ret.get("missing", [])
],
}
defer.returnValue(
(200, send_content)
)
@log_function
def _get_persisted_pdu(self, origin, event_id, do_auth=True):
""" Get a PDU from the database with given origin and id.

16
synapse/federation/transport/client.py
View file

@ -213,3 +213,19 @@ class TransportLayerClient(object):
)
defer.returnValue(response)
@defer.inlineCallbacks
@log_function
def send_query_auth(self, destination, room_id, event_id, content):
path = PREFIX + "/query_auth/%s/%s" % (room_id, event_id)
code, content = yield self.client.post_json(
destination=destination,
path=path,
data=content,
)
if not 200 <= code < 300:
raise RuntimeError("Got %d from send_invite", code)
defer.returnValue(json.loads(content))

21
synapse/federation/transport/server.py
View file

@ -42,7 +42,7 @@ class TransportLayerServer(object):
content = None
origin = None
if request.method == "PUT":
if request.method in ["PUT", "POST"]:
# TODO: Handle other method types? other content types?
try:
content_bytes = request.content.read()
@ -234,6 +234,16 @@ class TransportLayerServer(object):
)
)
)
self.server.register_path(
"POST",
re.compile("^" + PREFIX + "/query_auth/([^/]*)/([^/]*)$"),
self._with_authentication(
lambda origin, content, query, context, event_id:
self._on_query_auth_request(
origin, content, event_id,
)
)
)
@defer.inlineCallbacks
@log_function
@ -325,3 +335,12 @@ class TransportLayerServer(object):
)
defer.returnValue((200, content))
@defer.inlineCallbacks
@log_function
def _on_query_auth_request(self, origin, content, event_id):
new_content = yield self.request_handler.on_query_auth_request(
origin, content, event_id
)
defer.returnValue((200, new_content))

205
synapse/handlers/federation.py
View file

@ -126,7 +126,7 @@ class FederationHandler(BaseHandler):
if not state:
state, auth_chain = yield replication.get_state_for_room(
origin, context=event.room_id, event_id=event.event_id,
origin, room_id=event.room_id, event_id=event.event_id,
)
if not auth_chain:
@ -139,7 +139,7 @@ class FederationHandler(BaseHandler):
for e in auth_chain:
e.internal_metadata.outlier = True
try:
yield self._handle_new_event(e, fetch_auth_from=origin)
yield self._handle_new_event(origin, e)
except:
logger.exception(
"Failed to handle auth event %s",
@ -152,7 +152,7 @@ class FederationHandler(BaseHandler):
for e in state:
e.internal_metadata.outlier = True
try:
yield self._handle_new_event(e)
yield self._handle_new_event(origin, e)
except:
logger.exception(
"Failed to handle state event %s",
@ -161,6 +161,7 @@ class FederationHandler(BaseHandler):
try:
yield self._handle_new_event(
origin,
event,
state=state,
backfilled=backfilled,
@ -363,7 +364,14 @@ class FederationHandler(BaseHandler):
for e in auth_chain:
e.internal_metadata.outlier = True
try:
yield self._handle_new_event(e)
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in auth_chain
if e.event_id in auth_ids
}
yield self._handle_new_event(
target_host, e, auth_events=auth
)
except:
logger.exception(
"Failed to handle auth event %s",
@ -374,8 +382,13 @@ class FederationHandler(BaseHandler):
# FIXME: Auth these.
e.internal_metadata.outlier = True
try:
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in auth_chain
if e.event_id in auth_ids
}
yield self._handle_new_event(
e, fetch_auth_from=target_host
target_host, e, auth_events=auth
)
except:
logger.exception(
@ -384,6 +397,7 @@ class FederationHandler(BaseHandler):
)
yield self._handle_new_event(
target_host,
new_event,
state=state,
current_state=state,
@ -450,7 +464,7 @@ class FederationHandler(BaseHandler):
event.internal_metadata.outlier = False
context = yield self._handle_new_event(event)
context = yield self._handle_new_event(origin, event)
logger.debug(
"on_send_join_request: After _handle_new_event: %s, sigs: %s",
@ -651,11 +665,12 @@ class FederationHandler(BaseHandler):
waiters.pop().callback(None)
@defer.inlineCallbacks
def _handle_new_event(self, event, state=None, backfilled=False,
current_state=None, fetch_auth_from=None):
@log_function
def _handle_new_event(self, origin, event, state=None, backfilled=False,
current_state=None, auth_events=None):
logger.debug(
"_handle_new_event: Before annotate: %s, sigs: %s",
"_handle_new_event: %s, sigs: %s",
event.event_id, event.signatures,
)
@ -663,62 +678,34 @@ class FederationHandler(BaseHandler):
event, old_state=state
)
if not auth_events:
auth_events = context.auth_events
logger.debug(
"_handle_new_event: Before auth fetch: %s, sigs: %s",
event.event_id, event.signatures,
"_handle_new_event: %s, auth_events: %s",
event.event_id, auth_events,
)
is_new_state = not event.internal_metadata.is_outlier()
known_ids = set(
[s.event_id for s in context.auth_events.values()]
)
for e_id, _ in event.auth_events:
if e_id not in known_ids:
e = yield self.store.get_event(e_id, allow_none=True)
if not e and fetch_auth_from is not None:
# Grab the auth_chain over federation if we are missing
# auth events.
auth_chain = yield self.replication_layer.get_event_auth(
fetch_auth_from, event.event_id, event.room_id
)
for auth_event in auth_chain:
yield self._handle_new_event(auth_event)
e = yield self.store.get_event(e_id, allow_none=True)
if not e:
# TODO: Do some conflict res to make sure that we're
# not the ones who are wrong.
logger.info(
"Rejecting %s as %s not in db or %s",
event.event_id, e_id, known_ids,
)
# FIXME: How does raising AuthError work with federation?
raise AuthError(403, "Cannot find auth event")
context.auth_events[(e.type, e.state_key)] = e
logger.debug(
"_handle_new_event: Before hack: %s, sigs: %s",
event.event_id, event.signatures,
)
# This is a hack to fix some old rooms where the initial join event
# didn't reference the create event in its auth events.
if event.type == EventTypes.Member and not event.auth_events:
if len(event.prev_events) == 1:
c = yield self.store.get_event(event.prev_events[0][0])
if c.type == EventTypes.Create:
context.auth_events[(c.type, c.state_key)] = c
logger.debug(
"_handle_new_event: Before auth check: %s, sigs: %s",
event.event_id, event.signatures,
)
auth_events[(c.type, c.state_key)] = c
try:
self.auth.check(event, auth_events=context.auth_events)
except AuthError:
yield self.do_auth(
origin, event, context, auth_events=auth_events
)
except AuthError as e:
logger.warn(
"Rejecting %s because %s",
event.event_id, e.msg
)
# TODO: Store rejection.
context.rejected = RejectedReason.AUTH_ERROR
@ -731,11 +718,6 @@ class FederationHandler(BaseHandler):
)
raise
logger.debug(
"_handle_new_event: Before persist_event: %s, sigs: %s",
event.event_id, event.signatures,
)
yield self.store.persist_event(
event,
context=context,
@ -744,25 +726,73 @@ class FederationHandler(BaseHandler):
current_state=current_state,
)
logger.debug(
"_handle_new_event: After persist_event: %s, sigs: %s",
event.event_id, event.signatures,
)
defer.returnValue(context)
@defer.inlineCallbacks
def do_auth(self, origin, event, context):
for e_id, _ in event.auth_events:
def on_query_auth(self, origin, event_id, remote_auth_chain, rejects,
missing):
# Just go through and process each event in `remote_auth_chain`. We
# don't want to fall into the trap of `missing` being wrong.
for e in remote_auth_chain:
try:
yield self._handle_new_event(origin, e)
except AuthError:
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())
# Now get the current auth_chain for the event.
local_auth_chain = yield self.store.get_auth_chain([event_id])
missing_auth = auth_events - current_state
# TODO: Check if we would now reject event_id. If so we need to tell
# everyone.
ret = yield self.construct_auth_difference(
local_auth_chain, remote_auth_chain
)
logger.debug("on_query_auth reutrning: %s", ret)
defer.returnValue(ret)
@defer.inlineCallbacks
@log_function
def do_auth(self, origin, event, context, auth_events):
# Check if we have all the auth events.
res = yield self.store.have_events(
[e_id for e_id, _ in event.auth_events]
)
event_auth_events = set(e_id for e_id, _ in event.auth_events)
seen_events = set(res.keys())
missing_auth = event_auth_events - seen_events
if missing_auth:
logger.debug("Missing auth: %s", missing_auth)
# If we don't have all the auth events, we need to get them.
remote_auth_chain = yield self.replication_layer.get_event_auth(
origin, event.room_id, event.event_id
)
for e in remote_auth_chain:
try:
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in remote_auth_chain
if e.event_id in auth_ids
}
yield self._handle_new_event(
origin, e, auth_events=auth
)
auth_events[(e.type, e.state_key)] = e
except AuthError:
pass
current_state = set(e.event_id for e in auth_events.values())
different_auth = event_auth_events - current_state
if different_auth and not event.internal_metadata.is_outlier():
# Do auth conflict res.
logger.debug("Different auth: %s", different_auth)
# 1. Get what we think is the auth chain.
auth_ids = self.auth.compute_auth_events(event, context)
@ -778,14 +808,24 @@ class FederationHandler(BaseHandler):
# 3. Process any remote auth chain events we haven't seen.
for e in result.get("missing", []):
# TODO.
try:
auth_ids = [e_id for e_id, _ in e.auth_events]
auth = {
(e.type, e.state_key): e for e in result["auth_chain"]
if e.event_id in auth_ids
}
yield self._handle_new_event(
origin, e, auth_events=auth
)
auth_events[(e.type, e.state_key)] = e
except AuthError:
pass
# 4. Look at rejects and their proofs.
# TODO.
try:
self.auth.check(event, auth_events=context.auth_events)
self.auth.check(event, auth_events=auth_events)
except AuthError:
raise
@ -802,12 +842,16 @@ class FederationHandler(BaseHandler):
dict
"""
logger.debug("construct_auth_difference Start!")
# 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
logger.debug("construct_auth_difference after sort_fun!")
# 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
@ -823,11 +867,18 @@ class FederationHandler(BaseHandler):
local_iter = iter(local_list)
remote_iter = iter(remote_list)
current_local = local_iter.next()
current_remote = remote_iter.next()
logger.debug("construct_auth_difference before get_next!")
def get_next(it, opt=None):
return it.next() if it.has_next() else opt
try:
return it.next()
except:
return opt
current_local = get_next(local_iter)
current_remote = get_next(remote_iter)
logger.debug("construct_auth_difference before while")
missing_remotes = []
missing_locals = []
@ -867,6 +918,8 @@ class FederationHandler(BaseHandler):
current_remote = get_next(remote_iter)
continue
logger.debug("construct_auth_difference after while")
# missing locals should be sent to the server
# We should find why we are missing remotes, as they will have been
# rejected.
@ -886,6 +939,7 @@ class FederationHandler(BaseHandler):
reason = yield self.store.get_rejection_reason(e.event_id)
if reason is None:
# FIXME: ERRR?!
logger.warn("Could not find reason for %s", e.event_id)
raise RuntimeError("")
reason_map[e.event_id] = reason
@ -899,7 +953,10 @@ class FederationHandler(BaseHandler):
# TODO: Get proof.
pass
logger.debug("construct_auth_difference returning")
defer.returnValue({
"auth_chain": local_auth,
"rejects": {
e.event_id: {
"reason": reason_map[e.event_id],

4
synapse/storage/rejections.py
View file

@ -28,12 +28,12 @@ class RejectionsStore(SQLBaseStore):
values={
"event_id": event_id,
"reason": reason,
"last_failure": self._clock.time_msec(),
"last_check": self._clock.time_msec(),
}
)
def get_rejection_reason(self, event_id):
self._simple_select_one_onecol(
return self._simple_select_one_onecol(
table="rejections",
retcol="reason",
keyvalues={

2
tests/handlers/test_federation.py
View file

@ -52,6 +52,7 @@ class FederationTestCase(unittest.TestCase):
"get_room",
"get_destination_retry_timings",
"set_destination_retry_timings",
"have_events",
]),
resource_for_federation=NonCallableMock(),
http_client=NonCallableMock(spec_set=[]),
@ -90,6 +91,7 @@ class FederationTestCase(unittest.TestCase):
self.datastore.persist_event.return_value = defer.succeed(None)
self.datastore.get_room.return_value = defer.succeed(True)
self.auth.check_host_in_room.return_value = defer.succeed(True)
self.datastore.have_events.return_value = defer.succeed({})
def annotate(ev, old_state=None):
context = Mock()