Alexey Goncharuk created IGNITE-5569:
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Summary: TCP Discovery SPI allows multiple NODE_JOINED /
NODE_FAILED leading to a cluster DDoS
Key: IGNITE-5569
URL: https://issues.apache.org/jira/browse/IGNITE-5569
Project: Ignite
Issue Type: Bug
Components: general
Affects Versions: 1.7
Reporter: Alexey Goncharuk
Fix For: 2.1
A firewall configuration issue may effectively lead to a cluster DDoS. The
scheme is as follows:
1) A node G joins the cluster, and a firewall rule forbids incoming connection
from cluster to this node
2) Cluster successfully processes NodeAddedMesage (not sure why) and sends
NodeAddFinishedMessage
3) Each node receives NodeAddFinishedMessage and fires a discovery NODE_JOINED
event
4) The last node in the ring fails to connect to the newly joined node and
generates NODE_FAILED event
5) Coordinator drops the connection, joining node attempts to connect again
The issues I see here:
1) Neither coordinator nor joining node print out the reason why the joining
node failed / did not join. A slight hint (failed to send message to the next
node) is printed on the node with the largest order (the one that attempted to
close the ring), but the root cause (connection refused) is also not printed
2) The joining node attempts to connect to the cluster with the same node ID.
This violates an invariant we heavily rely on that once a node ID leaves a
cluster, this ID never comes back again
3) Each discovery event leads to a partition exchange which blocks all cache
operations for a time interval equal at least to the full ring latency time. If
several nodes are started on a malicious host, this may lead to almost full
cluster degradation
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