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suppress error on duplicate blobs (#4995)

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This commit is contained in:
realbigsean 2023-12-18 12:15:12 -05:00 committed by GitHub
parent dfc3b3714a
commit c55608be10
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5 changed files with 216 additions and 64 deletions
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2
beacon_node/beacon_chain/src/beacon_chain.rs
View File

@ -406,7 +406,7 @@ pub struct BeaconChain<T: BeaconChainTypes> {
/// Maintains a record of which validators have proposed blocks for each slot.
pub observed_block_producers: RwLock<ObservedBlockProducers<T::EthSpec>>,
/// Maintains a record of blob sidecars seen over the gossip network.
pub(crate) observed_blob_sidecars: RwLock<ObservedBlobSidecars<T::EthSpec>>,
pub observed_blob_sidecars: RwLock<ObservedBlobSidecars<T::EthSpec>>,
/// Maintains a record of which validators have submitted voluntary exits.
pub(crate) observed_voluntary_exits: Mutex<ObservedOperations<SignedVoluntaryExit, T::EthSpec>>,
/// Maintains a record of which validators we've seen proposer slashings for.

2
beacon_node/beacon_chain/src/blob_verification.rs
View File

@ -420,7 +420,7 @@ pub fn validate_blob_sidecar_for_gossip<T: BeaconChainTypes>(
if chain
.observed_blob_sidecars
.read()
.is_known(&blob_sidecar)
.proposer_is_known(&blob_sidecar)
.map_err(|e| GossipBlobError::BeaconChainError(e.into()))?
{
return Err(GossipBlobError::RepeatBlob {

242
beacon_node/beacon_chain/src/observed_blob_sidecars.rs
View File

@ -3,9 +3,10 @@
//! Only `BlobSidecar`s that have completed proposer signature verification can be added
//! to this cache to reduce DoS risks.
use crate::observed_block_producers::{ProposalKey, SeenBlock};
use std::collections::{HashMap, HashSet};
use std::marker::PhantomData;
use types::{BlobSidecar, EthSpec, Slot};
use types::{BlobSidecar, EthSpec, Hash256, Slot};
#[derive(Debug, PartialEq)]
pub enum Error {
@ -29,7 +30,7 @@ pub enum Error {
pub struct ObservedBlobSidecars<T: EthSpec> {
finalized_slot: Slot,
/// Stores all received blob indices for a given `(ValidatorIndex, Slot)` tuple.
items: HashMap<(u64, Slot), HashSet<u64>>,
items: HashMap<ProposalKey, (HashSet<u64>, HashSet<Hash256>)>,
_phantom: PhantomData<T>,
}
@ -50,27 +51,74 @@ impl<T: EthSpec> ObservedBlobSidecars<T> {
///
/// The supplied `blob_sidecar` **MUST** have completed proposer signature verification.
pub fn observe_sidecar(&mut self, blob_sidecar: &BlobSidecar<T>) -> Result<bool, Error> {
let block_root = blob_sidecar.block_root();
self.sanitize_blob_sidecar(blob_sidecar)?;
let did_not_exist = self
let (blob_indices, block_roots) = self
.items
.entry((blob_sidecar.block_proposer_index(), blob_sidecar.slot()))
.or_insert_with(|| HashSet::with_capacity(T::max_blobs_per_block()))
.insert(blob_sidecar.index);
.entry(ProposalKey {
slot: blob_sidecar.slot(),
proposer: blob_sidecar.block_proposer_index(),
})
.or_insert_with(|| {
(
HashSet::with_capacity(T::max_blobs_per_block()),
HashSet::new(),
)
});
let did_not_exist = blob_indices.insert(blob_sidecar.index);
block_roots.insert(block_root);
Ok(!did_not_exist)
}
/// Returns `true` if the `blob_sidecar` has already been observed in the cache within the prune window.
pub fn is_known(&self, blob_sidecar: &BlobSidecar<T>) -> Result<bool, Error> {
pub fn proposer_is_known(&self, blob_sidecar: &BlobSidecar<T>) -> Result<bool, Error> {
self.sanitize_blob_sidecar(blob_sidecar)?;
let is_known = self
.items
.get(&(blob_sidecar.block_proposer_index(), blob_sidecar.slot()))
.map_or(false, |set| set.contains(&blob_sidecar.index));
.get(&ProposalKey {
slot: blob_sidecar.slot(),
proposer: blob_sidecar.block_proposer_index(),
})
.map_or(false, |(blob_indices, _block_roots)| {
blob_indices.contains(&blob_sidecar.index)
});
Ok(is_known)
}
/// Returns `Ok(true)` if the `block_root` has been observed in a blob sidecar message before, `Ok(false)` if not.
/// Does not update the cache, so calling this function multiple times will continue to return
/// `Ok(false)`, until `Self::observe_proposer` is called.
///
/// ## Errors
///
/// - `key.proposer_index` is greater than `VALIDATOR_REGISTRY_LIMIT`.
/// - `key.slot` is equal to or less than the latest pruned `finalized_slot`.
pub fn proposer_has_been_observed(
&self,
slot: Slot,
proposer: u64,
block_root: Hash256,
) -> Result<SeenBlock, Error> {
let key = ProposalKey { slot, proposer };
if let Some((_, block_roots)) = self.items.get(&key) {
let block_already_known = block_roots.contains(&block_root);
let no_prev_known_blocks =
block_roots.difference(&HashSet::from([block_root])).count() == 0;
if !no_prev_known_blocks {
Ok(SeenBlock::Slashable)
} else if block_already_known {
Ok(SeenBlock::Duplicate)
} else {
Ok(SeenBlock::UniqueNonSlashable)
}
} else {
Ok(SeenBlock::UniqueNonSlashable)
}
}
fn sanitize_blob_sidecar(&self, blob_sidecar: &BlobSidecar<T>) -> Result<(), Error> {
if blob_sidecar.index >= T::max_blobs_per_block() as u64 {
return Err(Error::InvalidBlobIndex(blob_sidecar.index));
@ -93,7 +141,7 @@ impl<T: EthSpec> ObservedBlobSidecars<T> {
}
self.finalized_slot = finalized_slot;
self.items.retain(|k, _| k.1 > finalized_slot);
self.items.retain(|k, _| k.slot > finalized_slot);
}
}
@ -140,14 +188,20 @@ mod tests {
1,
"only one (validator_index, slot) tuple should be present"
);
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present")
.len(),
cached_blob_indices.len(),
1,
"only one item should be present"
"only one proposer should be present"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present"
);
/*
@ -158,14 +212,19 @@ mod tests {
assert_eq!(cache.finalized_slot, 0, "finalized slot is zero");
assert_eq!(cache.items.len(), 1, "only one slot should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present")
.len(),
cached_blob_indices.len(),
1,
"only one item should be present"
"only one proposer should be present"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present"
);
/*
@ -215,15 +274,20 @@ mod tests {
);
assert_eq!(cache.items.len(), 1, "only one slot should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_b, Slot::new(three_epochs)))
.expect("the three epochs slot should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_b, Slot::new(three_epochs)))
.expect("the three epochs slot should be present")
.len(),
cached_blob_indices.len(),
1,
"only one proposer should be present"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present"
);
/*
* Check that a prune doesnt wipe later blocks
@ -239,15 +303,20 @@ mod tests {
);
assert_eq!(cache.items.len(), 1, "only one slot should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_b, Slot::new(three_epochs)))
.expect("the three epochs slot should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_b, Slot::new(three_epochs)))
.expect("the three epochs slot should be present")
.len(),
cached_blob_indices.len(),
1,
"only one proposer should be present"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present"
);
}
#[test]
@ -259,7 +328,7 @@ mod tests {
let sidecar_a = get_blob_sidecar(0, proposer_index_a, 0);
assert_eq!(
cache.is_known(&sidecar_a),
cache.proposer_is_known(&sidecar_a),
Ok(false),
"no observation in empty cache"
);
@ -271,7 +340,7 @@ mod tests {
);
assert_eq!(
cache.is_known(&sidecar_a),
cache.proposer_is_known(&sidecar_a),
Ok(true),
"observed block is indicated as true"
);
@ -284,15 +353,20 @@ mod tests {
assert_eq!(cache.finalized_slot, 0, "finalized slot is zero");
assert_eq!(cache.items.len(), 1, "only one slot should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present")
.len(),
cached_blob_indices.len(),
1,
"only one proposer should be present"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present"
);
// Slot 1, proposer 0
@ -300,7 +374,7 @@ mod tests {
let sidecar_b = get_blob_sidecar(1, proposer_index_b, 0);
assert_eq!(
cache.is_known(&sidecar_b),
cache.proposer_is_known(&sidecar_b),
Ok(false),
"no observation for new slot"
);
@ -310,7 +384,7 @@ mod tests {
"can observe proposer for new slot, indicates proposer unobserved"
);
assert_eq!(
cache.is_known(&sidecar_b),
cache.proposer_is_known(&sidecar_b),
Ok(true),
"observed block in slot 1 is indicated as true"
);
@ -322,30 +396,40 @@ mod tests {
assert_eq!(cache.finalized_slot, 0, "finalized slot is zero");
assert_eq!(cache.items.len(), 2, "two slots should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present")
.len(),
cached_blob_indices.len(),
1,
"only one proposer should be present in slot 0"
);
assert_eq!(
cache
.items
.get(&(proposer_index_b, Slot::new(1)))
.expect("slot zero should be present")
.len(),
cached_block_roots.len(),
1,
"only one block root should be present in slot 0"
);
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_b, Slot::new(1)))
.expect("slot zero should be present");
assert_eq!(
cached_blob_indices.len(),
1,
"only one proposer should be present in slot 1"
);
assert_eq!(
cached_block_roots.len(),
1,
"only one block root should be present in slot 1"
);
// Slot 0, index 1
let sidecar_c = get_blob_sidecar(0, proposer_index_a, 1);
assert_eq!(
cache.is_known(&sidecar_c),
cache.proposer_is_known(&sidecar_c),
Ok(false),
"no observation for new index"
);
@ -355,7 +439,7 @@ mod tests {
"can observe new index, indicates sidecar unobserved for new index"
);
assert_eq!(
cache.is_known(&sidecar_c),
cache.proposer_is_known(&sidecar_c),
Ok(true),
"observed new sidecar is indicated as true"
);
@ -367,15 +451,57 @@ mod tests {
assert_eq!(cache.finalized_slot, 0, "finalized slot is zero");
assert_eq!(cache.items.len(), 2, "two slots should be present");
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cache
.items
.get(&(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present")
.len(),
cached_blob_indices.len(),
2,
"two blob indices should be present in slot 0"
);
// Changing the blob index doesn't change the block root, so only one unique signed
// header should be in the cache.
assert_eq!(
cached_block_roots.len(),
1,
"one block root should be present in slot 0"
);
// Create a sidecar sharing slot and proposer but with a different block root.
let mut sidecar_d: BlobSidecar<E> = BlobSidecar {
index: sidecar_c.index,
blob: sidecar_c.blob.clone(),
kzg_commitment: sidecar_c.kzg_commitment,
kzg_proof: sidecar_c.kzg_proof,
signed_block_header: sidecar_c.signed_block_header.clone(),
kzg_commitment_inclusion_proof: sidecar_c.kzg_commitment_inclusion_proof.clone(),
};
sidecar_d.signed_block_header.message.body_root = Hash256::repeat_byte(7);
assert_eq!(
cache.proposer_is_known(&sidecar_d),
Ok(true),
"there has been an observation for this proposer index"
);
assert_eq!(
cache.observe_sidecar(&sidecar_d),
Ok(true),
"indicates sidecar proposer was observed"
);
let (cached_blob_indices, cached_block_roots) = cache
.items
.get(&ProposalKey::new(proposer_index_a, Slot::new(0)))
.expect("slot zero should be present");
assert_eq!(
cached_blob_indices.len(),
2,
"two blob indices should be present in slot 0"
);
assert_eq!(
cached_block_roots.len(),
2,
"two block root should be present in slot 0"
);
// Try adding an out of bounds index
let invalid_index = E::max_blobs_per_block() as u64;

12
beacon_node/beacon_chain/src/observed_block_producers.rs
View File

@ -16,9 +16,15 @@ pub enum Error {
}
#[derive(Eq, Hash, PartialEq, Debug, Default)]
struct ProposalKey {
slot: Slot,
proposer: u64,
pub struct ProposalKey {
pub slot: Slot,
pub proposer: u64,
}
impl ProposalKey {
pub fn new(proposer: u64, slot: Slot) -> Self {
Self { slot, proposer }
}
}
/// Maintains a cache of observed `(block.slot, block.proposer)`.

22
beacon_node/http_api/src/publish_blocks.rs
View File

@ -113,7 +113,10 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlockConten
let (gossip_verified_block, gossip_verified_blobs) =
match block_contents.into_gossip_verified_block(&chain) {
Ok(b) => b,
Err(BlockContentsError::BlockError(BlockError::BlockIsAlreadyKnown)) => {
Err(BlockContentsError::BlockError(BlockError::BlockIsAlreadyKnown))
| Err(BlockContentsError::BlobError(
beacon_chain::blob_verification::GossipBlobError::RepeatBlob { .. },
)) => {
// Allow the status code for duplicate blocks to be overridden based on config.
return Ok(warp::reply::with_status(
warp::reply::json(&ErrorMessage {
@ -185,6 +188,23 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlockConten
"slot" => block_clone.slot()
);
Err(BlockError::Slashable)
} else if chain_clone
.observed_blob_sidecars
.read()
.proposer_has_been_observed(
block_clone.slot(),
block_clone.message().proposer_index(),
block_root,
)
.map_err(|e| BlockError::BeaconChainError(e.into()))?
.is_slashable()
{
warn!(
log_clone,
"Not publishing equivocating blob";
"slot" => block_clone.slot()
);
Err(BlockError::Slashable)
} else {
publish_block(
block_clone,