mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-13 03:35:17 +00:00
55 lines
2.4 KiB
Markdown
55 lines
2.4 KiB
Markdown
|
# Allowlist
|
||
|
|
|
||
|
|
Imagine you have a node that is getting overloaded by possibly malicious
|
||
|
|
incoming connections. This node won't be able to accept incoming connections
|
||
|
|
from peers it _knows_ to be good. This node would effectively be _eclipsed_ from
|
||
|
|
the network since no other nodes will be able to connect to it.
|
||
|
|
|
||
|
|
This is the problem that the Allowlist is designed to solve.
|
||
|
|
|
||
|
|
## Design Goals
|
||
|
|
|
||
|
|
- We should not fail to allocate a resource for an allowlisted peer because the
|
||
|
|
normal transient and system scopes are at their limits. This is the minimum
|
||
|
|
bar to avoid eclipse attacks.
|
||
|
|
- Minimal changes to resource manager and existing code (e.g. go-libp2p).
|
||
|
|
- The allowlist scope itself is limited to avoid giving an allowlisted peer the
|
||
|
|
ability to DoS a node.
|
||
|
|
- PeerIDs can optionally be fed into the allowlist. This will give an extra
|
||
|
|
step of verification before continuing to allow the peer to open streams.
|
||
|
|
- A peer may be able to open a connection, but after the handshake, if it's
|
||
|
|
not an expected peer id we move it to the normal system scope.
|
||
|
|
- We can have multiple PeerIDs for a given IP addr.
|
||
|
|
- No extra cost for the happy path when we are still below system and transient
|
||
|
|
limits.
|
||
|
|
|
||
|
|
## Proposed change
|
||
|
|
|
||
|
|
Add a change to `ResourceManager.OpenConnection` so that it accepts a multiaddr
|
||
|
|
parameter of the endpoint the connection is for.
|
||
|
|
|
||
|
|
Add a change to `ResourceManager` to initialize it with a set of allowlisted
|
||
|
|
multiaddrs. This set can be modified at runtime as well for dynamic updating.
|
||
|
|
|
||
|
|
For example, an allowlist set could look like:
|
||
|
|
```
|
||
|
|
/ip4/1.1.1.1
|
||
|
|
/ip6/2345:0425:2CA1::0567:5673:23b5
|
||
|
|
/ip4/192.168.1.1/p2p/qmFoo
|
||
|
|
/ip4/192.168.1.1/p2p/qmBar
|
||
|
|
/ip4/1.2.3.0/ipcidr/24
|
||
|
|
```
|
||
|
|
|
||
|
|
When a new connection is opened, the resource manager tries to allocate with the
|
||
|
|
normal system and transient resource scopes. If that fails, it checks if the
|
||
|
|
multiaddr matches an item in the set of allowlisted multiaddrs. If so, it
|
||
|
|
creates the connection resource scope using the allowlisted specific system and
|
||
|
|
transient resource scopes. If it wasn't an allowlisted multiaddr it fails as
|
||
|
|
before.
|
||
|
|
|
||
|
|
When an allowlisted connection is tied to a peer id and transfered with
|
||
|
|
`ConnManagementScope.SetPeer`, we check if that peer id matches the expected
|
||
|
|
value in the allowlist (if it exists). If it does not match, we attempt to
|
||
|
|
transfer this resource to the normal system and peer scope. If that transfer
|
||
|
|
fails we close the connection.
|