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55 lines
2.4 KiB
Markdown
55 lines
2.4 KiB
Markdown
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# Allowlist
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Imagine you have a node that is getting overloaded by possibly malicious
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incoming connections. This node won't be able to accept incoming connections
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from peers it _knows_ to be good. This node would effectively be _eclipsed_ from
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the network since no other nodes will be able to connect to it.
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This is the problem that the Allowlist is designed to solve.
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## Design Goals
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- We should not fail to allocate a resource for an allowlisted peer because the
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normal transient and system scopes are at their limits. This is the minimum
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bar to avoid eclipse attacks.
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- Minimal changes to resource manager and existing code (e.g. go-libp2p).
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- The allowlist scope itself is limited to avoid giving an allowlisted peer the
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ability to DoS a node.
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- PeerIDs can optionally be fed into the allowlist. This will give an extra
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step of verification before continuing to allow the peer to open streams.
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- A peer may be able to open a connection, but after the handshake, if it's
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not an expected peer id we move it to the normal system scope.
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- We can have multiple PeerIDs for a given IP addr.
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- No extra cost for the happy path when we are still below system and transient
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limits.
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## Proposed change
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Add a change to `ResourceManager.OpenConnection` so that it accepts a multiaddr
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parameter of the endpoint the connection is for.
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Add a change to `ResourceManager` to initialize it with a set of allowlisted
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multiaddrs. This set can be modified at runtime as well for dynamic updating.
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For example, an allowlist set could look like:
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```
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/ip4/1.1.1.1
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/ip6/2345:0425:2CA1::0567:5673:23b5
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/ip4/192.168.1.1/p2p/qmFoo
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/ip4/192.168.1.1/p2p/qmBar
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/ip4/1.2.3.0/ipcidr/24
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```
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When a new connection is opened, the resource manager tries to allocate with the
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normal system and transient resource scopes. If that fails, it checks if the
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multiaddr matches an item in the set of allowlisted multiaddrs. If so, it
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creates the connection resource scope using the allowlisted specific system and
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transient resource scopes. If it wasn't an allowlisted multiaddr it fails as
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before.
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When an allowlisted connection is tied to a peer id and transfered with
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`ConnManagementScope.SetPeer`, we check if that peer id matches the expected
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value in the allowlist (if it exists). If it does not match, we attempt to
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transfer this resource to the normal system and peer scope. If that transfer
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fails we close the connection.
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