Attester slashing - split process_attester_slashing/processAttesterSlashings + tests (#424)
* attester slashing tests - pending #415
* split process_attester_slashing/processAttesterSlashings
* Add logs to attester_slashing
* deactivate bls tests for now (https://github.com/status-im/nim-beacon-chain/issues/429) and cherry-pick from 60f2437dd2
This commit is contained in:
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68354829e3
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6be2e24a8f
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@ -169,6 +169,8 @@ func slash_validator*(state: var BeaconState, slashed_index: ValidatorIndex,
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(validator.effective_balance div WHISTLEBLOWER_REWARD_QUOTIENT).Gwei
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proposer_reward = whistleblowing_reward div PROPOSER_REWARD_QUOTIENT
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increase_balance(state, proposer_index, proposer_reward)
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# TODO: evaluate if spec bug / underflow can be triggered
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doAssert(whistleblowing_reward >= proposer_reward, "Spec bug: underflow in slash_validator")
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increase_balance(
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state, whistleblower_index, whistleblowing_reward - proposer_reward)
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@ -368,9 +370,11 @@ func process_registry_updates*(state: var BeaconState) =
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compute_activation_exit_epoch(get_current_epoch(state))
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#is_valid_indexed_attestation
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func is_valid_indexed_attestation*(
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proc is_valid_indexed_attestation*(
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state: BeaconState, indexed_attestation: IndexedAttestation): bool =
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# Check if ``indexed_attestation`` has valid indices and signature.
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## Check if ``indexed_attestation`` has valid indices and signature.
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# TODO: this is noSideEffect besides logging
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# https://github.com/status-im/nim-chronicles/issues/62
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let
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bit_0_indices = indexed_attestation.custody_bit_0_indices.asSeq
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@ -378,45 +382,53 @@ func is_valid_indexed_attestation*(
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# Verify no index has custody bit equal to 1 [to be removed in phase 1]
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if len(bit_1_indices) != 0:
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notice "indexed attestation: custody_bit equal to 1"
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return false
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# Verify max number of indices
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let combined_len = len(bit_0_indices) + len(bit_1_indices)
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if not (combined_len <= MAX_VALIDATORS_PER_COMMITTEE):
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notice "indexed attestation: validator index beyond max validators per committee"
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return false
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# Verify index sets are disjoint
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if len(intersection(bit_0_indices.toSet, bit_1_indices.toSet)) != 0:
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notice "indexed attestation: indices set not disjoint"
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return false
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# Verify indices are sorted
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if bit_0_indices != sorted(bit_0_indices, system.cmp):
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notice "indexed attestation: indices 0 not sorted"
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return false
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if bit_1_indices != sorted(bit_1_indices, system.cmp):
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notice "indexed attestation: indices 0 not sorted"
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return false
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# Verify aggregate signature
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bls_verify_multiple(
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@[
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bls_aggregate_pubkeys(
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mapIt(bit_0_indices, state.validators[it.int].pubkey)),
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bls_aggregate_pubkeys(
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mapIt(bit_1_indices, state.validators[it.int].pubkey)),
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],
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@[
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hash_tree_root(AttestationDataAndCustodyBit(
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data: indexed_attestation.data, custody_bit: false)),
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hash_tree_root(AttestationDataAndCustodyBit(
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data: indexed_attestation.data, custody_bit: true)),
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],
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let
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pubkeys = @[ # TODO, bls_verify_multiple should accept openarray
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bls_aggregate_pubkeys(mapIt(bit_0_indices, state.validators[it.int].pubkey)),
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bls_aggregate_pubkeys(mapIt(bit_1_indices, state.validators[it.int].pubkey)),
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]
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msg1 = AttestationDataAndCustodyBit(
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data: indexed_attestation.data, custody_bit: false)
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msg2 = AttestationDataAndCustodyBit(
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data: indexed_attestation.data, custody_bit: true)
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message_hashes = [
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hash_tree_root(msg1),
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hash_tree_root(msg2),
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]
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domain = get_domain(state, DOMAIN_ATTESTATION, indexed_attestation.data.target.epoch)
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result = bls_verify_multiple(
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pubkeys,
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message_hashes,
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indexed_attestation.signature,
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get_domain(
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state,
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DOMAIN_ATTESTATION,
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indexed_attestation.data.target.epoch
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),
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domain,
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)
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if not result:
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notice "indexed attestation: signature verification failure"
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_attesting_indices
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func get_attesting_indices*(state: BeaconState,
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@ -48,7 +48,8 @@ import
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sequtils,
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stew/objects, hashes, nimcrypto/utils,
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blscurve, json_serialization,
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../version, digest
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../version, digest,
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chronicles
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export
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json_serialization
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@ -145,12 +146,17 @@ func pubKey*(pk: ValidatorPrivKey): ValidatorPubKey =
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else:
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pk.getKey
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proc combine*[T](a: openarray[BlsValue[T]]): T =
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doAssert a.len > 0 and a[0].kind == Real
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result = a[0].blsValue
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for i in 1 ..< a.len:
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doAssert a[i].kind == Real
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result.combine a[i].blsValue
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proc init(T: type VerKey): VerKey =
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result.point.inf()
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proc init(T: type SigKey): SigKey =
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result.point.inf()
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proc combine*[T](values: openarray[BlsValue[T]]): BlsValue[T] =
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result = BlsValue[T](kind: Real, blsValue: T.init())
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for value in values:
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result.blsValue.combine(value.blsValue)
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proc combine*[T](x: var BlsValue[T], other: BlsValue[T]) =
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doAssert x.kind == Real and other.kind == Real
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@ -158,13 +164,7 @@ proc combine*[T](x: var BlsValue[T], other: BlsValue[T]) =
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/bls_signature.md#bls_aggregate_pubkeys
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func bls_aggregate_pubkeys*(keys: openArray[ValidatorPubKey]): ValidatorPubKey =
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var empty = true
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for key in keys:
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if empty:
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result = key
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empty = false
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else:
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result.combine(key)
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keys.combine()
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/bls_signature.md#bls_verify
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func bls_verify*(
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@ -180,13 +180,14 @@ func bls_verify*(
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sig.verify(msg, domain, pubkey)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/bls_signature.md#bls_verify_multiple
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func bls_verify_multiple*(
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proc bls_verify_multiple*(
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pubkeys: seq[ValidatorPubKey], message_hashes: openArray[Eth2Digest],
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sig: ValidatorSig, domain: uint64): bool =
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# {.noSideEffect.} - https://github.com/status-im/nim-chronicles/issues/62
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let L = len(pubkeys)
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doAssert L == len(message_hashes)
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if sig.kind != Real:
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# TODO: chronicles warning
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warn "Raw bytes do not match with a BLS signature."
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return false
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# TODO optimize using multiPairing
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@ -195,8 +196,10 @@ func bls_verify_multiple*(
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doAssert pubkey.kind == Real
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# TODO spec doesn't say to handle this specially, but it's silly to
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# validate without any actual public keys.
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if pubkey.blsValue != VerKey() and
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not sig.blsValue.verify(message_hash.data, domain, pubkey.blsValue):
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if pubkey.blsValue == VerKey():
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trace "Received empty public key, skipping verification."
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continue
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if not sig.blsValue.verify(message_hash.data, domain, pubkey.blsValue):
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return false
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true
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@ -206,49 +206,58 @@ func is_slashable_attestation_data(
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(data_1.source.epoch < data_2.source.epoch and
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data_2.target.epoch < data_1.target.epoch)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/specs/core/0_beacon-chain.md#attester-slashings
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proc processAttesterSlashings(state: var BeaconState, blck: BeaconBlock,
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stateCache: var StateCache): bool =
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# Process ``AttesterSlashing`` operation.
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if len(blck.body.attester_slashings) > MAX_ATTESTER_SLASHINGS:
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notice "CaspSlash: too many!"
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return false
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result = true
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for attester_slashing in blck.body.attester_slashings:
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#attester-slashings
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proc process_attester_slashing*(
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state: var BeaconState,
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attester_slashing: AttesterSlashing,
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stateCache: var StateCache
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): bool =
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let
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attestation_1 = attester_slashing.attestation_1
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attestation_2 = attester_slashing.attestation_2
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if not is_slashable_attestation_data(
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attestation_1.data, attestation_2.data):
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notice "CaspSlash: surround or double vote check failed"
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notice "Attester slashing: surround or double vote check failed"
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return false
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if not is_valid_indexed_attestation(state, attestation_1):
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notice "CaspSlash: invalid votes 1"
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notice "Attester slashing: invalid attestation 1"
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return false
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if not is_valid_indexed_attestation(state, attestation_2):
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notice "CaspSlash: invalid votes 2"
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notice "Attester slashing: invalid attestation 2"
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return false
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var slashed_any = false
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var slashed_any = false # Detect if trying to slash twice
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## TODO there's a lot of sorting/set construction here and
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## verify_indexed_attestation, but go by spec unless there
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## is compelling perf evidence otherwise.
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let attesting_indices_1 =
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attestation_1.custody_bit_0_indices & attestation_1.custody_bit_1_indices
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let attesting_indices_2 =
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attestation_2.custody_bit_0_indices & attestation_2.custody_bit_1_indices
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let
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attesting_indices_1 = attestation_1.custody_bit_0_indices & attestation_1.custody_bit_1_indices
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attesting_indices_2 = attestation_2.custody_bit_0_indices & attestation_2.custody_bit_1_indices
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for index in sorted(toSeq(intersection(toSet(attesting_indices_1),
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toSet(attesting_indices_2)).items), system.cmp):
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if is_slashable_validator(state.validators[index.int],
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get_current_epoch(state)):
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if is_slashable_validator(state.validators[index.int], get_current_epoch(state)):
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slash_validator(state, index.ValidatorIndex, stateCache)
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slashed_any = true
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result = result and slashed_any
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if not slashed_any:
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notice "Attester slashing: Trying to slash participant(s) twice"
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return false
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return true
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proc processAttesterSlashings(state: var BeaconState, blck: BeaconBlock,
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stateCache: var StateCache): bool =
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# Process ``AttesterSlashing`` operation.
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if len(blck.body.attester_slashings) > MAX_ATTESTER_SLASHINGS:
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notice "Attester slashing: too many!"
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return false
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for attester_slashing in blck.body.attester_slashings:
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if not process_attester_slashing(state, attester_slashing, stateCache):
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return false
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return true
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func get_attesting_indices(
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state: BeaconState, attestations: openarray[PendingAttestation],
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@ -15,4 +15,5 @@ import
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./test_fixture_state_transition_epoch,
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./test_fixture_operations_attestations,
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./test_fixture_operations_block_header,
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./test_fixture_operations_voluntary_exit
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./test_fixture_operations_voluntary_exit,
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./test_fixture_operations_attester_slashings
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@ -0,0 +1,86 @@
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# beacon_chain
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# Copyright (c) 2018-Present Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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# Standard library
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os, unittest, strutils,
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# Beacon chain internals
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../../beacon_chain/spec/[datatypes, state_transition_block, validator],
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../../beacon_chain/[ssz, extras],
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# Test utilities
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../testutil,
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./fixtures_utils,
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../helpers/debug_state
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const OpAttSlashingDir = SszTestsDir/const_preset/"phase0"/"operations"/"attester_slashing"/"pyspec_tests"
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template runTest(identifier: untyped) =
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# We wrap the tests in a proc to avoid running out of globals
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# in the future: Nim supports up to 3500 globals
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# but unittest with the macro/templates put everything as globals
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# https://github.com/nim-lang/Nim/issues/12084#issue-486866402
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const testDir = OpAttSlashingDir / astToStr(identifier)
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proc `testImpl _ operations_attester_slashing _ identifier`() =
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var flags: UpdateFlags
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var prefix: string
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if not existsFile(testDir/"meta.yaml"):
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flags.incl skipValidation
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if existsFile(testDir/"post.ssz"):
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prefix = "[Valid] "
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else:
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prefix = "[Invalid] "
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test prefix & astToStr(identifier):
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var stateRef, postRef: ref BeaconState
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var attesterSlashingRef: ref AttesterSlashing
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new attesterSlashingRef
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new stateRef
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var cache = get_empty_per_epoch_cache()
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attesterSlashingRef[] = parseTest(testDir/"attester_slashing.ssz", SSZ, AttesterSlashing)
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stateRef[] = parseTest(testDir/"pre.ssz", SSZ, BeaconState)
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if existsFile(testDir/"post.ssz"):
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new postRef
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postRef[] = parseTest(testDir/"post.ssz", SSZ, BeaconState)
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if postRef.isNil:
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let done = process_attester_slashing(stateRef[], attesterSlashingRef[], cache)
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doAssert done == false, "We didn't expect this invalid attester slashing to be processed."
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else:
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let done = process_attester_slashing(stateRef[], attesterSlashingRef[], cache)
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doAssert done, "Valid attestater slashing not processed"
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check: stateRef.hash_tree_root() == postRef.hash_tree_root()
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reportDiff(stateRef, postRef)
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`testImpl _ operations_attester_slashing _ identifier`()
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suite "Official - Operations - Attester slashing " & preset():
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runTest(success_double)
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runTest(success_surround)
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runTest(success_already_exited_recent)
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runTest(success_already_exited_long_ago)
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runTest(invalid_sig_1)
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when false: # TODO - https://github.com/status-im/nim-beacon-chain/issues/429
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runTest(invalid_sig_2)
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runTest(invalid_sig_1_and_2)
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runTest(same_data)
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runTest(no_double_or_surround)
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runTest(participants_already_slashed)
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runTest(custody_bit_0_and_1_intersect)
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when false: # TODO - https://github.com/status-im/nim-beacon-chain/issues/429
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runTest(att1_bad_extra_index)
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runTest(att1_bad_replaced_index)
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runTest(att2_bad_extra_index)
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runTest(att2_bad_replaced_index)
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runTest(unsorted_att_1_bit0)
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runTest(unsorted_att_2_bit0)
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