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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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102
validator_client/src/block_service.rs
View File

@@ -7,8 +7,11 @@ use crate::{
};
use crate::{http_metrics::metrics, validator_store::ValidatorStore};
use environment::RuntimeContext;
use eth2::BeaconNodeHttpClient;
use slog::{crit, debug, error, info, trace, warn};
use slot_clock::SlotClock;
use std::fmt::Debug;
use std::future::Future;
use std::ops::Deref;
use std::sync::Arc;
use std::time::Duration;
@@ -45,6 +48,7 @@ pub struct BlockServiceBuilder<T, E: EthSpec> {
validator_store: Option<Arc<ValidatorStore<T, E>>>,
slot_clock: Option<Arc<T>>,
beacon_nodes: Option<Arc<BeaconNodeFallback<T, E>>>,
proposer_nodes: Option<Arc<BeaconNodeFallback<T, E>>>,
context: Option<RuntimeContext<E>>,
graffiti: Option<Graffiti>,
graffiti_file: Option<GraffitiFile>,
@@ -57,6 +61,7 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockServiceBuilder<T, E> {
validator_store: None,
slot_clock: None,
beacon_nodes: None,
proposer_nodes: None,
context: None,
graffiti: None,
graffiti_file: None,
@@ -79,6 +84,11 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockServiceBuilder<T, E> {
self
}
pub fn proposer_nodes(mut self, proposer_nodes: Arc<BeaconNodeFallback<T, E>>) -> Self {
self.proposer_nodes = Some(proposer_nodes);
self
}
pub fn runtime_context(mut self, context: RuntimeContext<E>) -> Self {
self.context = Some(context);
self
@@ -114,6 +124,7 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockServiceBuilder<T, E> {
context: self
.context
.ok_or("Cannot build BlockService without runtime_context")?,
proposer_nodes: self.proposer_nodes,
graffiti: self.graffiti,
graffiti_file: self.graffiti_file,
block_delay: self.block_delay,
@@ -122,11 +133,81 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockServiceBuilder<T, E> {
}
}
// Combines a set of non-block-proposing `beacon_nodes` and only-block-proposing
// `proposer_nodes`.
pub struct ProposerFallback<T, E: EthSpec> {
beacon_nodes: Arc<BeaconNodeFallback<T, E>>,
proposer_nodes: Option<Arc<BeaconNodeFallback<T, E>>>,
}
impl<T: SlotClock, E: EthSpec> ProposerFallback<T, E> {
// Try `func` on `self.proposer_nodes` first. If that doesn't work, try `self.beacon_nodes`.
pub async fn first_success_try_proposers_first<'a, F, O, Err, R>(
&'a self,
require_synced: RequireSynced,
offline_on_failure: OfflineOnFailure,
func: F,
) -> Result<O, Errors<Err>>
where
F: Fn(&'a BeaconNodeHttpClient) -> R + Clone,
R: Future<Output = Result<O, Err>>,
Err: Debug,
{
// If there are proposer nodes, try calling `func` on them and return early if they are successful.
if let Some(proposer_nodes) = &self.proposer_nodes {
if let Ok(result) = proposer_nodes
.first_success(require_synced, offline_on_failure, func.clone())
.await
{
return Ok(result);
}
}
// If the proposer nodes failed, try on the non-proposer nodes.
self.beacon_nodes
.first_success(require_synced, offline_on_failure, func)
.await
}
// Try `func` on `self.beacon_nodes` first. If that doesn't work, try `self.proposer_nodes`.
pub async fn first_success_try_proposers_last<'a, F, O, Err, R>(
&'a self,
require_synced: RequireSynced,
offline_on_failure: OfflineOnFailure,
func: F,
) -> Result<O, Errors<Err>>
where
F: Fn(&'a BeaconNodeHttpClient) -> R + Clone,
R: Future<Output = Result<O, Err>>,
Err: Debug,
{
// Try running `func` on the non-proposer beacon nodes.
let beacon_nodes_result = self
.beacon_nodes
.first_success(require_synced, offline_on_failure, func.clone())
.await;
match (beacon_nodes_result, &self.proposer_nodes) {
// The non-proposer node call succeed, return the result.
(Ok(success), _) => Ok(success),
// The non-proposer node call failed, but we don't have any proposer nodes. Return an error.
(Err(e), None) => Err(e),
// The non-proposer node call failed, try the same call on the proposer nodes.
(Err(_), Some(proposer_nodes)) => {
proposer_nodes
.first_success(require_synced, offline_on_failure, func)
.await
}
}
}
}
/// Helper to minimise `Arc` usage.
pub struct Inner<T, E: EthSpec> {
validator_store: Arc<ValidatorStore<T, E>>,
slot_clock: Arc<T>,
beacon_nodes: Arc<BeaconNodeFallback<T, E>>,
proposer_nodes: Option<Arc<BeaconNodeFallback<T, E>>>,
context: RuntimeContext<E>,
graffiti: Option<Graffiti>,
graffiti_file: Option<GraffitiFile>,
@@ -334,16 +415,23 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
let self_ref = &self;
let proposer_index = self.validator_store.validator_index(&validator_pubkey);
let validator_pubkey_ref = &validator_pubkey;
let proposer_fallback = ProposerFallback {
beacon_nodes: self.beacon_nodes.clone(),
proposer_nodes: self.proposer_nodes.clone(),
};
info!(
log,
"Requesting unsigned block";
"slot" => slot.as_u64(),
);
// Request block from first responsive beacon node.
let block = self
.beacon_nodes
.first_success(
//
// Try the proposer nodes last, since it's likely that they don't have a
// great view of attestations on the network.
let block = proposer_fallback
.first_success_try_proposers_last(
RequireSynced::No,
OfflineOnFailure::Yes,
|beacon_node| async move {
@@ -424,8 +512,12 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
);
// Publish block with first available beacon node.
self.beacon_nodes
.first_success(
//
// Try the proposer nodes first, since we've likely gone to efforts to
// protect them from DoS attacks and they're most likely to successfully
// publish a block.
proposer_fallback
.first_success_try_proposers_first(
RequireSynced::No,
OfflineOnFailure::Yes,
|beacon_node| async {