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Separate BN for block proposals (#4182)

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It is a well-known fact that IP addresses for beacon nodes used by specific validators can be de-anonymized. There is an assumed risk that a malicious user may attempt to DOS validators when producing blocks to prevent chain growth/liveness.

Although there are a number of ideas put forward to address this, there a few simple approaches we can take to mitigate this risk.

Currently, a Lighthouse user is able to set a number of beacon-nodes that their validator client can connect to. If one beacon node is taken offline, it can fallback to another. Different beacon nodes can use VPNs or rotate IPs in order to mask their IPs.

This PR provides an additional setup option which further mitigates attacks of this kind.

This PR introduces a CLI flag --proposer-only to the beacon node. Setting this flag will configure the beacon node to run with minimal peers and crucially will not subscribe to subnets or sync committees. Therefore nodes of this kind should not be identified as nodes connected to validators of any kind.

It also introduces a CLI flag --proposer-nodes to the validator client. Users can then provide a number of beacon nodes (which may or may not run the --proposer-only flag) that the Validator client will use for block production and propagation only. If these nodes fail, the validator client will fallback to the default list of beacon nodes.

Users are then able to set up a number of beacon nodes dedicated to block proposals (which are unlikely to be identified as validator nodes) and point their validator clients to produce blocks on these nodes and attest on other beacon nodes. An attack attempting to prevent liveness on the eth2 network would then need to preemptively find and attack the proposer nodes which is significantly more difficult than the default setup.

This is a follow on from: #3328 

Co-authored-by: Michael Sproul <michael@sigmaprime.io>
Co-authored-by: Paul Hauner <paul@paulhauner.com>
This commit is contained in:
Age Manning
2023-04-26 01:12:36 +00:00
parent 90d562b3d4
commit 7456e1e8fa
16 changed files with 452 additions and 75 deletions
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10
beacon_node/src/cli.rs
View File

@@ -123,7 +123,6 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
Arg::with_name("target-peers")
.long("target-peers")
.help("The target number of peers.")
.default_value("80")
.takes_value(true),
)
.arg(
@@ -269,6 +268,15 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
.min_values(0)
.hidden(true)
)
.arg(
Arg::with_name("proposer-only")
.long("proposer-only")
.help("Sets this beacon node at be a block proposer only node. \
This will run the beacon node in a minimal configuration that is sufficient for block publishing only. This flag should be used \
for a beacon node being referenced by validator client using the --proposer-node flag. This configuration is for enabling more secure setups.")
.takes_value(false),
)
.arg(
Arg::with_name("disable-backfill-rate-limiting")
.long("disable-backfill-rate-limiting")

17
beacon_node/src/config.rs
View File

@@ -979,10 +979,13 @@ pub fn set_network_config(
config.set_listening_addr(parse_listening_addresses(cli_args, log)?);
// A custom target-peers command will overwrite the --proposer-only default.
if let Some(target_peers_str) = cli_args.value_of("target-peers") {
config.target_peers = target_peers_str
.parse::<usize>()
.map_err(|_| format!("Invalid number of target peers: {}", target_peers_str))?;
} else {
config.target_peers = 80; // default value
}
if let Some(value) = cli_args.value_of("network-load") {
@@ -1218,6 +1221,20 @@ pub fn set_network_config(
config.outbound_rate_limiter_config = Some(Default::default());
}
// Proposer-only mode overrides a number of previous configuration parameters.
// Specifically, we avoid subscribing to long-lived subnets and wish to maintain a minimal set
// of peers.
if cli_args.is_present("proposer-only") {
config.subscribe_all_subnets = false;
if cli_args.value_of("target-peers").is_none() {
// If a custom value is not set, change the default to 15
config.target_peers = 15;
}
config.proposer_only = true;
warn!(log, "Proposer-only mode enabled"; "info"=> "Do not connect a validator client to this node unless via the --proposer-nodes flag");
}
Ok(())
}