1495 lines
66 KiB
Nim
1495 lines
66 KiB
Nim
# beacon_chain
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# Copyright (c) 2019-2024 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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{.push raises: [].}
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import
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# Status
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chronicles, chronos, metrics,
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results,
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# Internals
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../spec/[
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beaconstate, state_transition_block, forks, helpers, network, signatures],
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../consensus_object_pools/[
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attestation_pool, blockchain_dag, blob_quarantine, block_quarantine,
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spec_cache, light_client_pool, sync_committee_msg_pool,
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validator_change_pool],
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".."/[beacon_clock],
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./batch_validation
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from libp2p/protocols/pubsub/errors import ValidationResult
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export results, ValidationResult
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logScope:
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topics = "gossip_checks"
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declareCounter beacon_attestations_dropped_queue_full,
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"Number of attestations dropped because queue is full"
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declareCounter beacon_aggregates_dropped_queue_full,
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"Number of aggregates dropped because queue is full"
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declareCounter beacon_sync_messages_dropped_queue_full,
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"Number of sync committee messages dropped because queue is full"
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declareCounter beacon_contributions_dropped_queue_full,
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"Number of sync committee contributions dropped because queue is full"
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# This result is a little messy in that it returns Result.ok for
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# ValidationResult.Accept and an err for the others - this helps transport
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# an error message to callers but could arguably be done in an cleaner way.
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type
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ValidationError* = (ValidationResult, cstring)
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template errIgnore*(msg: cstring): untyped =
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err((ValidationResult.Ignore, cstring msg))
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template errReject*(msg: cstring): untyped =
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err((ValidationResult.Reject, cstring msg))
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# Internal checks
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# ----------------------------------------------------------------
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func check_attestation_block(
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pool: AttestationPool, attestationSlot: Slot, blck: BlockRef):
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Result[void, ValidationError] =
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# The voted-for block must be a descendant of the finalized block, thus it
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# must at least as new than the finalized checkpoint - in theory it could be
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# equal, but then we're voting for an already-finalized block which is pretty
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# useless - other blocks that are not rooted in the finalized chain will be
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# pruned by the chain dag, and thus we can no longer get a BlockRef for them
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if not (blck.slot > pool.dag.finalizedHead.slot):
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return errIgnore("Voting for already-finalized block")
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# The attestation shouldn't be voting for a block that didn't exist at the
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# time - not in spec, but hard to reason about
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if not (attestationSlot >= blck.slot):
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return errIgnore("Voting for block that didn't exist at the time")
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# We'll also cap it at 4 epochs which is somewhat arbitrary, but puts an
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# upper bound on the processing done to validate the attestation
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# TODO revisit with less arbitrary approach
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if not ((attestationSlot - blck.slot) <= uint64(4 * SLOTS_PER_EPOCH)):
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return errIgnore("Voting for very old block")
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ok()
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func check_propagation_slot_range(
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consensusFork: ConsensusFork, msgSlot: Slot, wallTime: BeaconTime):
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Result[Slot, ValidationError] =
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let futureSlot = (wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
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if not futureSlot.afterGenesis or msgSlot > futureSlot.slot:
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return errIgnore("Attestation slot in the future")
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let pastSlot = (wallTime - MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
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if not pastSlot.afterGenesis:
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return ok(msgSlot)
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if consensusFork < ConsensusFork.Deneb:
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#configuration
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# The spec value of ATTESTATION_PROPAGATION_SLOT_RANGE is 32, but it can
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# retransmit attestations on the cusp of being out of spec, and which by
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# the time they reach their destination might be out of spec.
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const TIME_IN_FLIGHT_BUFFER = 4
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static: doAssert ATTESTATION_PROPAGATION_SLOT_RANGE > TIME_IN_FLIGHT_BUFFER
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if msgSlot + (ATTESTATION_PROPAGATION_SLOT_RANGE - TIME_IN_FLIGHT_BUFFER) <
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pastSlot.slot:
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return errIgnore("Attestation slot in the past")
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else:
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.2/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
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# "[IGNORE] the epoch of attestation.data.slot is either the current or
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# previous epoch (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
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# compute_epoch_at_slot(attestation.data.slot) in
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# (get_previous_epoch(state), get_current_epoch(state))"
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#
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.2/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
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# "[IGNORE] the epoch of aggregate.data.slot is either the current or
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# previous epoch (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
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# compute_epoch_at_slot(aggregate.data.slot) in
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# (get_previous_epoch(state), get_current_epoch(state))"
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if msgSlot.epoch < pastSlot.slot.epoch.get_previous_epoch:
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return errIgnore("Attestation slot in the past")
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ok(msgSlot)
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func check_slot_exact(msgSlot: Slot, wallTime: BeaconTime):
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Result[Slot, ValidationError] =
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let futureSlot = (wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
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if not futureSlot.afterGenesis or msgSlot > futureSlot.slot:
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return errIgnore("Sync committee slot in the future")
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let pastSlot = (wallTime - MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
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if pastSlot.afterGenesis and msgSlot < pastSlot.slot:
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return errIgnore("Sync committee slot in the past")
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ok(msgSlot)
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func check_beacon_and_target_block(
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pool: var AttestationPool, data: AttestationData):
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Result[BlockSlot, ValidationError] =
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# The block being voted for (data.beacon_block_root) passes validation - by
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# extension, the target block must at that point also pass validation.
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# The target block is returned.
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# We rely on the chain DAG to have been validated, so check for the existence
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# of the block in the pool.
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let blck = pool.dag.getBlockRef(data.beacon_block_root).valueOr:
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pool.quarantine[].addMissing(data.beacon_block_root)
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return errIgnore("Attestation block unknown")
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# Not in spec - check that rewinding to the state is sane
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? check_attestation_block(pool, data.slot, blck)
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# [REJECT] The attestation's target block is an ancestor of the block named
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# in the LMD vote -- i.e.
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# get_checkpoint_block(store, attestation.data.beacon_block_root,
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# attestation.data.target.epoch) == attestation.data.target.root
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# the sanity of target.epoch has been checked by check_attestation_slot_target
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let target = blck.atCheckpoint(data.target).valueOr:
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return errReject("Attestation target is not ancestor of LMD vote block")
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ok(target)
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func check_aggregation_count(
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attestation: phase0.Attestation, singular: bool):
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Result[void, ValidationError] =
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let ones = attestation.aggregation_bits.countOnes()
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if singular and ones != 1:
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return errReject("Attestation must have a single attestation bit set")
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elif not singular and ones < 1:
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return errReject("Attestation must have at least one attestation bit set")
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ok()
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func check_attestation_subnet(
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shufflingRef: ShufflingRef, slot: Slot, committee_index: CommitteeIndex,
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subnet_id: SubnetId): Result[void, ValidationError] =
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let
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expectedSubnet = compute_subnet_for_attestation(
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get_committee_count_per_slot(shufflingRef), slot, committee_index)
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if expectedSubnet != subnet_id:
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return errReject("Attestation not on the correct subnet")
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ok()
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func check_blob_sidecar_inclusion_proof(
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blob_sidecar: deneb.BlobSidecar): Result[void, ValidationError] =
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let res = blob_sidecar.verify_blob_sidecar_inclusion_proof()
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if res.isErr:
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return errReject(res.error)
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ok()
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# Gossip Validation
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# ----------------------------------------------------------------
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# Generally, the following rules apply for gossip validation:
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#
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# [REJECT]
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# This doesn't depend on the wall clock or the exact state of the DAG; it's
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# an internal consistency/correctness check only, and effectively never has
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# false positives. These don't, for example, arise from timeouts.
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#
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# [IGNORE]
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# This may be intermittent, depend on timing or the current state of the DAG.
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template checkedReject(
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msg: cstring, strictVerification: bool): untyped =
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if strictVerification:
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raiseAssert $msg
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errReject(msg)
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template checkedReject(
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error: ValidationError, strictVerification: bool): untyped =
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doAssert error[0] == ValidationResult.Reject
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if strictVerification:
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raiseAssert $error[1]
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err(error)
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template checkedResult*(
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error: ValidationError, strictVerification: bool): untyped =
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if error[0] == ValidationResult.Reject and strictVerification:
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raiseAssert $error[1]
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err(error)
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# ChainDAGRef
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template checkedReject(
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dag: ChainDAGRef, msg: cstring): untyped =
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checkedReject(msg, strictVerification in dag.updateFlags)
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template checkedReject(
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dag: ChainDAGRef, error: ValidationError): untyped =
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checkedReject(error, strictVerification in dag.updateFlags)
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template checkedResult(
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dag: ChainDAGRef, error: ValidationError): untyped =
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checkedResult(error, strictVerification in dag.updateFlags)
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# AttestationPool
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template checkedReject(
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pool: ref AttestationPool, msg: cstring): untyped =
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pool[].dag.checkedReject(msg)
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template checkedReject(
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pool: ref AttestationPool, error: ValidationError): untyped =
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pool[].dag.checkedReject(error)
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template checkedResult(
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pool: ref AttestationPool, error: ValidationError): untyped =
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pool[].dag.checkedResult(error)
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# ValidatorChangePool
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template checkedReject(
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pool: ValidatorChangePool, msg: cstring): untyped =
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pool.dag.checkedReject(msg)
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template checkedReject(
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pool: ValidatorChangePool, error: ValidationError): untyped =
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pool.dag.checkedReject(error)
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template checkedResult(
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pool: ValidatorChangePool, error: ValidationError): untyped =
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pool.dag.checkedResult(error)
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template validateBeaconBlockBellatrix(
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signed_beacon_block: phase0.SignedBeaconBlock | altair.SignedBeaconBlock,
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parent: BlockRef): untyped =
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discard
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/p2p-interface.md#beacon_block
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template validateBeaconBlockBellatrix(
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signed_beacon_block:
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bellatrix.SignedBeaconBlock |
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capella.SignedBeaconBlock |
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deneb.SignedBeaconBlock |
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electra.SignedBeaconBlock,
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parent: BlockRef): untyped =
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# If the execution is enabled for the block -- i.e.
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# is_execution_enabled(state, block.body) then validate the following:
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#
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# `is_execution_enabled(state, block.body)` is
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# `is_merge_transition_block(state, block.body) or is_merge_transition_complete(state)` is
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# `(not is_merge_transition_complete(state) and block.body.execution_payload != ExecutionPayload()) or is_merge_transition_complete(state)` is
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# `is_merge_transition_complete(state) or block.body.execution_payload != ExecutionPayload()` is
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# `is_merge_transition_complete(state) or is_execution_block(block)`
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#
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# `is_merge_transition_complete(state)` tests for
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# `state.latest_execution_payload_header != ExecutionPayloadHeader()`, while
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#block-processing
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# shows that `state.latest_execution_payload_header` being default or not is
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# exactly equivalent to whether that block's execution payload is default or
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# not, so test cached block information rather than reconstructing a state.
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let isExecutionEnabled =
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if signed_beacon_block.message.is_execution_block:
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true
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else:
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# If we don't know whether the parent block had execution enabled,
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# assume it didn't. This way, we don't reject here if the timestamp
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# is invalid, and let state transition check the timestamp.
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# This is an edge case, and may be hit in a pathological scenario with
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# checkpoint sync, because the checkpoint block may be unavailable
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# and it could already be the parent of the new block before backfill.
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not dag.loadExecutionBlockHash(parent).get(ZERO_HASH).isZero
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if isExecutionEnabled:
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# [REJECT] The block's execution payload timestamp is correct with respect
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# to the slot -- i.e. execution_payload.timestamp ==
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# compute_timestamp_at_slot(state, block.slot).
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let timestampAtSlot =
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withState(dag.headState):
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compute_timestamp_at_slot(
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forkyState.data, signed_beacon_block.message.slot)
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if not (signed_beacon_block.message.body.execution_payload.timestamp ==
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timestampAtSlot):
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quarantine[].addUnviable(signed_beacon_block.root)
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return dag.checkedReject(
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"BeaconBlock: mismatched execution payload timestamp")
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# The condition:
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# [REJECT] The block's parent (defined by `block.parent_root`) passes all
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# validation (excluding execution node verification of the
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# `block.body.execution_payload`).
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# cannot occur here, because Nimbus's optimistic sync waits for either
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# `ACCEPTED` or `SYNCING` from the EL to get this far.
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# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.4/specs/deneb/p2p-interface.md#blob_sidecar_subnet_id
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proc validateBlobSidecar*(
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dag: ChainDAGRef, quarantine: ref Quarantine,
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blobQuarantine: ref BlobQuarantine, blob_sidecar: BlobSidecar,
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wallTime: BeaconTime, subnet_id: BlobId): Result[void, ValidationError] =
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# Some of the checks below have been reordered compared to the spec, to
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# perform the cheap checks first - in particular, we want to avoid loading
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# an `EpochRef` and checking signatures. This reordering might lead to
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# different IGNORE/REJECT results in turn affecting gossip scores.
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template block_header: untyped = blob_sidecar.signed_block_header.message
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# [REJECT] The sidecar's index is consistent with `MAX_BLOBS_PER_BLOCK`
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# -- i.e. `blob_sidecar.index < MAX_BLOBS_PER_BLOCK`
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if not (blob_sidecar.index < MAX_BLOBS_PER_BLOCK):
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return dag.checkedReject("BlobSidecar: index inconsistent")
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# [REJECT] The sidecar is for the correct subnet -- i.e.
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# `compute_subnet_for_blob_sidecar(blob_sidecar.index) == subnet_id`.
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if not (compute_subnet_for_blob_sidecar(blob_sidecar.index) == subnet_id):
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return dag.checkedReject("BlobSidecar: subnet incorrect")
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# [IGNORE] The sidecar is not from a future slot (with a
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# `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance) -- i.e. validate that
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# `block_header.slot <= current_slot` (a client MAY queue future sidecars
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# for processing at the appropriate slot).
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if not (block_header.slot <=
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(wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).slotOrZero):
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return errIgnore("BlobSidecar: slot too high")
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# [IGNORE] The sidecar is from a slot greater than the latest
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# finalized slot -- i.e. validate that `block_header.slot >
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# compute_start_slot_at_epoch(state.finalized_checkpoint.epoch)`
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if not (block_header.slot > dag.finalizedHead.slot):
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return errIgnore("BlobSidecar: slot already finalized")
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# [IGNORE] The sidecar is the first sidecar for the tuple
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# (block_header.slot, block_header.proposer_index, blob_sidecar.index)
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# with valid header signature, sidecar inclusion proof, and kzg proof.
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let block_root = hash_tree_root(block_header)
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if dag.getBlockRef(block_root).isSome():
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return errIgnore("BlobSidecar: already have block")
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if blobQuarantine[].hasBlob(
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block_header.slot, block_header.proposer_index, blob_sidecar.index):
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return errIgnore("BlobSidecar: already have valid blob from same proposer")
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# [REJECT] The sidecar's inclusion proof is valid as verified by
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# `verify_blob_sidecar_inclusion_proof(blob_sidecar)`.
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block:
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let v = check_blob_sidecar_inclusion_proof(blob_sidecar)
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if v.isErr:
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return dag.checkedReject(v.error)
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# [IGNORE] The sidecar's block's parent (defined by
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# `block_header.parent_root`) has been seen (via both gossip and
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# non-gossip sources) (a client MAY queue sidecars for processing
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# once the parent block is retrieved).
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#
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# [REJECT] The sidecar's block's parent (defined by
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# `block_header.parent_root`) passes validation.
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let parent = dag.getBlockRef(block_header.parent_root).valueOr:
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if block_header.parent_root in quarantine[].unviable:
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quarantine[].addUnviable(block_root)
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return dag.checkedReject("BlobSidecar: parent not validated")
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else:
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quarantine[].addMissing(block_header.parent_root)
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return errIgnore("BlobSidecar: parent not found")
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# [REJECT] The sidecar is from a higher slot than the sidecar's
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# block's parent (defined by `block_header.parent_root`).
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if not (block_header.slot > parent.bid.slot):
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return dag.checkedReject("BlobSidecar: slot lower than parents'")
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# [REJECT] The current finalized_checkpoint is an ancestor of the sidecar's
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# block -- i.e. `get_checkpoint_block(store, block_header.parent_root,
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# store.finalized_checkpoint.epoch) == store.finalized_checkpoint.root`.
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let
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finalized_checkpoint = getStateField(dag.headState, finalized_checkpoint)
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ancestor = get_ancestor(parent, finalized_checkpoint.epoch.start_slot)
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if ancestor.isNil:
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# This shouldn't happen: we should always be able to trace the parent back
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# to the finalized checkpoint (else it wouldn't be in the DAG)
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return errIgnore("BlobSidecar: Can't find ancestor")
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if not (
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finalized_checkpoint.root == ancestor.root or
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finalized_checkpoint.root.isZero):
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quarantine[].addUnviable(block_root)
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return dag.checkedReject(
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"BlobSidecar: Finalized checkpoint not an ancestor")
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# [REJECT] The sidecar is proposed by the expected `proposer_index`
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# for the block's slot in the context of the current shuffling
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# (defined by `block_header.parent_root`/`block_header.slot`).
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# If the proposer_index cannot immediately be verified against the expected
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# shuffling, the sidecar MAY be queued for later processing while proposers
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# for the block's branch are calculated -- in such a case do not
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# REJECT, instead IGNORE this message.
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let proposer = getProposer(dag, parent, block_header.slot).valueOr:
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warn "cannot compute proposer for blob"
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return errIgnore("BlobSidecar: Cannot compute proposer") # internal issue
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|
if uint64(proposer) != block_header.proposer_index:
|
|
return dag.checkedReject("BlobSidecar: Unexpected proposer")
|
|
|
|
# [REJECT] The proposer signature of `blob_sidecar.signed_block_header`,
|
|
# is valid with respect to the `block_header.proposer_index` pubkey.
|
|
if not verify_block_signature(
|
|
dag.forkAtEpoch(block_header.slot.epoch),
|
|
getStateField(dag.headState, genesis_validators_root),
|
|
block_header.slot,
|
|
block_root,
|
|
dag.validatorKey(proposer).get(),
|
|
blob_sidecar.signed_block_header.signature):
|
|
return dag.checkedReject("BlobSidecar: Invalid proposer signature")
|
|
|
|
# [REJECT] The sidecar's blob is valid as verified by `verify_blob_kzg_proof(
|
|
# blob_sidecar.blob, blob_sidecar.kzg_commitment, blob_sidecar.kzg_proof)`.
|
|
block:
|
|
let ok = verifyProof(
|
|
blob_sidecar.blob,
|
|
blob_sidecar.kzg_commitment,
|
|
blob_sidecar.kzg_proof).valueOr:
|
|
return dag.checkedReject("BlobSidecar: blob verify failed")
|
|
if not ok:
|
|
return dag.checkedReject("BlobSidecar: blob invalid")
|
|
|
|
# Send notification about new blob sidecar via callback
|
|
if not(isNil(blobQuarantine.onBlobSidecarCallback)):
|
|
blobQuarantine.onBlobSidecarCallback(blob_sidecar)
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_block
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/p2p-interface.md#beacon_block
|
|
proc validateBeaconBlock*(
|
|
dag: ChainDAGRef, quarantine: ref Quarantine,
|
|
signed_beacon_block: ForkySignedBeaconBlock,
|
|
wallTime: BeaconTime, flags: UpdateFlags): Result[void, ValidationError] =
|
|
# In general, checks are ordered from cheap to expensive. Especially, crypto
|
|
# verification could be quite a bit more expensive than the rest. This is an
|
|
# externally easy-to-invoke function by tossing network packets at the node.
|
|
|
|
# [IGNORE] The block is not from a future slot (with a
|
|
# MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e. validate that
|
|
# signed_beacon_block.message.slot <= current_slot (a client MAY queue future
|
|
# blocks for processing at the appropriate slot).
|
|
if not (signed_beacon_block.message.slot <=
|
|
(wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).slotOrZero):
|
|
return errIgnore("BeaconBlock: slot too high")
|
|
|
|
# [IGNORE] The block is from a slot greater than the latest finalized slot --
|
|
# i.e. validate that signed_beacon_block.message.slot >
|
|
# compute_start_slot_at_epoch(state.finalized_checkpoint.epoch)
|
|
if not (signed_beacon_block.message.slot > dag.finalizedHead.slot):
|
|
return errIgnore("BeaconBlock: slot already finalized")
|
|
|
|
# [IGNORE] The block is the first block with valid signature received for the
|
|
# proposer for the slot, signed_beacon_block.message.slot.
|
|
#
|
|
# While this condition is similar to the proposer slashing condition at
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/validator.md#proposer-slashing
|
|
# it's not identical, and this check does not address slashing:
|
|
#
|
|
# (1) The beacon blocks must be conflicting, i.e. different, for the same
|
|
# slot and proposer. This check also catches identical blocks.
|
|
#
|
|
# (2) By this point in the function, it's not been checked whether they're
|
|
# signed yet. As in general, expensive checks should be deferred, this
|
|
# would add complexity not directly relevant this function.
|
|
#
|
|
# (3) As evidenced by point (1), the similarity in the validation condition
|
|
# and slashing condition, while not coincidental, aren't similar enough
|
|
# to combine, as one or the other might drift.
|
|
#
|
|
# (4) Furthermore, this function, as much as possible, simply returns a yes
|
|
# or no answer, without modifying other state for p2p network interface
|
|
# validation. Complicating this interface, for the sake of sharing only
|
|
# couple lines of code, wouldn't be worthwhile.
|
|
#
|
|
# TODO might check unresolved/orphaned blocks too, and this might not see all
|
|
# blocks at a given slot (though, in theory, those get checked elsewhere), or
|
|
# adding metrics that count how often these conditions occur.
|
|
if dag.containsForkBlock(signed_beacon_block.root):
|
|
# The gossip algorithm itself already does one round of hashing to find
|
|
# already-seen data, but it is fairly aggressive about forgetting about
|
|
# what it has seen already
|
|
# "[IGNORE] The block is the first block ..."
|
|
return errIgnore("BeaconBlock: already seen")
|
|
|
|
let
|
|
slotBlock = getBlockIdAtSlot(dag, signed_beacon_block.message.slot)
|
|
|
|
if slotBlock.isSome() and slotBlock.get().isProposed() and
|
|
slotBlock.get().bid.slot == signed_beacon_block.message.slot:
|
|
let curBlock = dag.getForkedBlock(slotBlock.get().bid)
|
|
if curBlock.isOk():
|
|
let data = curBlock.get()
|
|
if getForkedBlockField(data, proposer_index) ==
|
|
signed_beacon_block.message.proposer_index and
|
|
data.signature.toRaw() != signed_beacon_block.signature.toRaw():
|
|
return errIgnore("BeaconBlock: already proposed in the same slot")
|
|
|
|
# [IGNORE] The block's parent (defined by block.parent_root) has been seen
|
|
# (via both gossip and non-gossip sources) (a client MAY queue blocks for
|
|
# processing once the parent block is retrieved).
|
|
#
|
|
# [REJECT] The block's parent (defined by block.parent_root)
|
|
# passes validation.
|
|
let parent = dag.getBlockRef(signed_beacon_block.message.parent_root).valueOr:
|
|
if signed_beacon_block.message.parent_root in quarantine[].unviable:
|
|
quarantine[].addUnviable(signed_beacon_block.root)
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/p2p-interface.md#beacon_block
|
|
# `is_execution_enabled(state, block.body)` check, but unlike in
|
|
# validateBeaconBlockBellatrix() don't have parent BlockRef.
|
|
if signed_beacon_block.message.is_execution_block:
|
|
# Blocks with execution enabled will be permitted to propagate
|
|
# regardless of the validity of the execution payload. This prevents
|
|
# network segregation between optimistic and non-optimistic nodes.
|
|
#
|
|
# If execution_payload verification of block's parent by an execution
|
|
# node is not complete:
|
|
#
|
|
# - [REJECT] The block's parent (defined by `block.parent_root`) passes
|
|
# all validation (excluding execution node verification of the
|
|
# `block.body.execution_payload`).
|
|
#
|
|
# otherwise:
|
|
#
|
|
# - [IGNORE] The block's parent (defined by `block.parent_root`) passes
|
|
# all validation (including execution node verification of the
|
|
# `block.body.execution_payload`).
|
|
|
|
# Implementation restrictions:
|
|
#
|
|
# - We don't know if the parent state had execution enabled.
|
|
# If it had, and the block doesn't have it enabled anymore,
|
|
# we end up in the pre-Merge path below (`else`) and REJECT.
|
|
# Such a block is clearly invalid, though, without asking the EL.
|
|
#
|
|
# - We know that the parent was marked unviable, but don't know
|
|
# whether it was marked unviable due to consensus (REJECT) or
|
|
# execution (IGNORE) verification failure. We err on the IGNORE side.
|
|
return errIgnore("BeaconBlock: ignored, parent from unviable fork")
|
|
else:
|
|
# [REJECT] The block's parent (defined by `block.parent_root`) passes
|
|
# validation.
|
|
return dag.checkedReject(
|
|
"BeaconBlock: rejected, parent from unviable fork")
|
|
|
|
# When the parent is missing, we can't validate the block - we'll queue it
|
|
# in the quarantine for later processing
|
|
if (let r = quarantine[].addOrphan(
|
|
dag.finalizedHead.slot,
|
|
ForkedSignedBeaconBlock.init(signed_beacon_block)); r.isErr):
|
|
debug "validateBeaconBlock: could not add orphan",
|
|
blockRoot = shortLog(signed_beacon_block.root),
|
|
blck = shortLog(signed_beacon_block.message),
|
|
err = r.error()
|
|
else:
|
|
debug "Block quarantined",
|
|
blockRoot = shortLog(signed_beacon_block.root),
|
|
blck = shortLog(signed_beacon_block.message),
|
|
signature = shortLog(signed_beacon_block.signature)
|
|
return errIgnore("BeaconBlock: parent not found")
|
|
|
|
# Continues block parent validity checking in optimistic case, where it does
|
|
# appear as a `BlockRef` (and not handled above) but isn't usable for gossip
|
|
# validation.
|
|
validateBeaconBlockBellatrix(signed_beacon_block, parent)
|
|
|
|
# [REJECT] The block is from a higher slot than its parent.
|
|
if not (signed_beacon_block.message.slot > parent.bid.slot):
|
|
return dag.checkedReject(
|
|
"BeaconBlock: block not from higher slot than its parent")
|
|
|
|
# [REJECT] The current finalized_checkpoint is an ancestor of block -- i.e.
|
|
# get_ancestor(store, block.parent_root,
|
|
# compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)) ==
|
|
# store.finalized_checkpoint.root
|
|
let
|
|
finalized_checkpoint = getStateField(dag.headState, finalized_checkpoint)
|
|
ancestor = get_ancestor(parent, finalized_checkpoint.epoch.start_slot)
|
|
|
|
if ancestor.isNil:
|
|
# This shouldn't happen: we should always be able to trace the parent back
|
|
# to the finalized checkpoint (else it wouldn't be in the DAG)
|
|
return errIgnore("BeaconBlock: Can't find ancestor")
|
|
|
|
if not (
|
|
finalized_checkpoint.root == ancestor.root or
|
|
finalized_checkpoint.root.isZero):
|
|
quarantine[].addUnviable(signed_beacon_block.root)
|
|
return dag.checkedReject(
|
|
"BeaconBlock: Finalized checkpoint not an ancestor")
|
|
|
|
# [REJECT] The block is proposed by the expected proposer_index for the
|
|
# block's slot in the context of the current shuffling (defined by
|
|
# parent_root/slot). If the proposer_index cannot immediately be verified
|
|
# against the expected shuffling, the block MAY be queued for later
|
|
# processing while proposers for the block's branch are calculated -- in such
|
|
# a case do not REJECT, instead IGNORE this message.
|
|
let
|
|
proposer = getProposer(
|
|
dag, parent, signed_beacon_block.message.slot).valueOr:
|
|
warn "cannot compute proposer for block"
|
|
return errIgnore("BeaconBlock: Cannot compute proposer") # internal issue
|
|
|
|
if uint64(proposer) != signed_beacon_block.message.proposer_index:
|
|
quarantine[].addUnviable(signed_beacon_block.root)
|
|
return dag.checkedReject("BeaconBlock: Unexpected proposer")
|
|
|
|
# [REJECT] The proposer signature, signed_beacon_block.signature, is valid
|
|
# with respect to the proposer_index pubkey.
|
|
if not verify_block_signature(
|
|
dag.forkAtEpoch(signed_beacon_block.message.slot.epoch),
|
|
getStateField(dag.headState, genesis_validators_root),
|
|
signed_beacon_block.message.slot,
|
|
signed_beacon_block.root,
|
|
dag.validatorKey(proposer).get(),
|
|
signed_beacon_block.signature):
|
|
quarantine[].addUnviable(signed_beacon_block.root)
|
|
return dag.checkedReject("BeaconBlock: Invalid proposer signature")
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
|
|
proc validateAttestation*(
|
|
pool: ref AttestationPool,
|
|
batchCrypto: ref BatchCrypto,
|
|
attestation: phase0.Attestation,
|
|
wallTime: BeaconTime,
|
|
subnet_id: SubnetId, checkSignature: bool):
|
|
Future[Result[
|
|
tuple[attesting_index: ValidatorIndex, sig: CookedSig],
|
|
ValidationError]] {.async: (raises: [CancelledError]).} =
|
|
# Some of the checks below have been reordered compared to the spec, to
|
|
# perform the cheap checks first - in particular, we want to avoid loading
|
|
# an `EpochRef` and checking signatures. This reordering might lead to
|
|
# different IGNORE/REJECT results in turn affecting gossip scores.
|
|
|
|
# [REJECT] The attestation's epoch matches its target -- i.e.
|
|
# attestation.data.target.epoch ==
|
|
# compute_epoch_at_slot(attestation.data.slot)
|
|
let slot = block:
|
|
let v = check_attestation_slot_target(attestation.data)
|
|
if v.isErr():
|
|
return pool.checkedReject(v.error())
|
|
v.get()
|
|
|
|
# attestation.data.slot is within the last ATTESTATION_PROPAGATION_SLOT_RANGE
|
|
# slots (within a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
|
|
# attestation.data.slot + ATTESTATION_PROPAGATION_SLOT_RANGE >= current_slot
|
|
# >= attestation.data.slot (a client MAY queue future attestations for
|
|
# processing at the appropriate slot).
|
|
#
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.2/specs/deneb/p2p-interface.md#beacon_attestation_subnet_id
|
|
# modifies this for Deneb and newer forks.
|
|
block:
|
|
let v = check_propagation_slot_range(
|
|
pool.dag.cfg.consensusForkAtEpoch(wallTime.slotOrZero.epoch), slot,
|
|
wallTime)
|
|
if v.isErr(): # [IGNORE]
|
|
return err(v.error())
|
|
|
|
# The attestation is unaggregated -- that is, it has exactly one
|
|
# participating validator (len([bit for bit in attestation.aggregation_bits
|
|
# if bit == 0b1]) == 1).
|
|
block:
|
|
let v = check_aggregation_count(attestation, singular = true)
|
|
if v.isErr(): # [REJECT]
|
|
return pool.checkedReject(v.error)
|
|
|
|
# The block being voted for (attestation.data.beacon_block_root) has been seen
|
|
# (via both gossip and non-gossip sources) (a client MAY queue attestations
|
|
# for processing once block is retrieved).
|
|
# [REJECT] The block being voted for (attestation.data.beacon_block_root)
|
|
# passes validation.
|
|
# [IGNORE] if block is unseen so far and enqueue it in missing blocks
|
|
let target = block:
|
|
let v = check_beacon_and_target_block(pool[], attestation.data)
|
|
if v.isErr(): # [IGNORE/REJECT]
|
|
return pool.checkedResult(v.error)
|
|
v.get()
|
|
|
|
# The following rule follows implicitly from that we clear out any
|
|
# unviable blocks from the chain dag:
|
|
#
|
|
# [IGNORE] The current finalized_checkpoint is an ancestor of the block
|
|
# defined by attestation.data.beacon_block_root -- i.e.
|
|
# get_checkpoint_block(store, attestation.data.beacon_block_root,
|
|
# store.finalized_checkpoint.epoch) == store.finalized_checkpoint.root
|
|
let
|
|
shufflingRef =
|
|
pool.dag.getShufflingRef(target.blck, target.slot.epoch, false).valueOr:
|
|
# Target is verified - shouldn't happen
|
|
warn "No shuffling for attestation - report bug",
|
|
attestation = shortLog(attestation), target = shortLog(target)
|
|
return errIgnore("Attestation: no shuffling")
|
|
|
|
# [REJECT] The committee index is within the expected range -- i.e.
|
|
# data.index < get_committee_count_per_slot(state, data.target.epoch).
|
|
let committee_index = block:
|
|
let idx = shufflingRef.get_committee_index(attestation.data.index)
|
|
if idx.isErr():
|
|
return pool.checkedReject(
|
|
"Attestation: committee index not within expected range")
|
|
idx.get()
|
|
|
|
# [REJECT] The attestation is for the correct subnet -- i.e.
|
|
# compute_subnet_for_attestation(committees_per_slot,
|
|
# attestation.data.slot, attestation.data.index) == subnet_id, where
|
|
# committees_per_slot = get_committee_count_per_slot(state,
|
|
# attestation.data.target.epoch), which may be pre-computed along with the
|
|
# committee information for the signature check.
|
|
block:
|
|
let v = check_attestation_subnet(
|
|
shufflingRef, attestation.data.slot, committee_index, subnet_id)
|
|
if v.isErr(): # [REJECT]
|
|
return pool.checkedReject(v.error)
|
|
|
|
# [REJECT] The number of aggregation bits matches the committee size -- i.e.
|
|
# len(attestation.aggregation_bits) == len(get_beacon_committee(state,
|
|
# data.slot, data.index)).
|
|
#
|
|
# This uses the same epochRef as data.target.epoch, because the attestation's
|
|
# epoch matches its target and attestation.data.target.root is an ancestor of
|
|
# attestation.data.beacon_block_root.
|
|
if not attestation.aggregation_bits.compatible_with_shuffling(
|
|
shufflingRef, slot, committee_index):
|
|
return pool.checkedReject(
|
|
"Attestation: number of aggregation bits and committee size mismatch")
|
|
|
|
let
|
|
fork = pool.dag.forkAtEpoch(attestation.data.slot.epoch)
|
|
attesting_index = get_attesting_indices_one(
|
|
shufflingRef, slot, committee_index, attestation.aggregation_bits)
|
|
|
|
# The number of aggregation bits matches the committee size, which ensures
|
|
# this condition holds.
|
|
doAssert attesting_index.isSome(),
|
|
"We've checked bits length and one count already"
|
|
let validator_index = attesting_index.get()
|
|
|
|
# There has been no other valid attestation seen on an attestation subnet
|
|
# that has an identical `attestation.data.target.epoch` and participating
|
|
# validator index.
|
|
# Slightly modified to allow only newer attestations than were previously
|
|
# seen (no point in propagating older votes)
|
|
if (pool.nextAttestationEpoch.lenu64 > validator_index.uint64) and
|
|
pool.nextAttestationEpoch[validator_index].subnet >
|
|
attestation.data.target.epoch:
|
|
return errIgnore("Attestation: Validator has already voted in epoch")
|
|
|
|
let pubkey = pool.dag.validatorKey(validator_index).valueOr:
|
|
# can't happen, in theory, because we checked the aggregator index above
|
|
return errIgnore("Attestation: cannot find validator pubkey")
|
|
|
|
# [REJECT] The signature of `attestation` is valid.
|
|
|
|
# In the spec, is_valid_indexed_attestation is used to verify the signature -
|
|
# here, we do a batch verification instead
|
|
let sig =
|
|
if checkSignature:
|
|
# Attestation signatures are batch-verified
|
|
let deferredCrypto = batchCrypto
|
|
.scheduleAttestationCheck(
|
|
fork, attestation.data, pubkey,
|
|
attestation.signature)
|
|
if deferredCrypto.isErr():
|
|
return pool.checkedReject(deferredCrypto.error)
|
|
|
|
let (cryptoFut, sig) = deferredCrypto.get()
|
|
# Await the crypto check
|
|
let x = (await cryptoFut)
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return pool.checkedReject("Attestation: invalid signature")
|
|
of BatchResult.Timeout:
|
|
beacon_attestations_dropped_queue_full.inc()
|
|
return errIgnore("Attestation: timeout checking signature")
|
|
of BatchResult.Valid:
|
|
sig # keep going only in this case
|
|
else:
|
|
attestation.signature.load().valueOr:
|
|
return pool.checkedReject("Attestation: unable to load signature")
|
|
|
|
# Only valid attestations go in the list, which keeps validator_index
|
|
# in range
|
|
if not (pool.nextAttestationEpoch.lenu64 > validator_index.uint64):
|
|
pool.nextAttestationEpoch.setLen(validator_index.int + 1)
|
|
pool.nextAttestationEpoch[validator_index].subnet =
|
|
attestation.data.target.epoch + 1
|
|
|
|
return ok((validator_index, sig))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
|
|
proc validateAggregate*(
|
|
pool: ref AttestationPool,
|
|
batchCrypto: ref BatchCrypto,
|
|
signedAggregateAndProof: phase0.SignedAggregateAndProof,
|
|
wallTime: BeaconTime,
|
|
checkSignature = true, checkCover = true):
|
|
Future[Result[
|
|
tuple[attestingIndices: seq[ValidatorIndex], sig: CookedSig],
|
|
ValidationError]] {.async: (raises: [CancelledError]).} =
|
|
# Some of the checks below have been reordered compared to the spec, to
|
|
# perform the cheap checks first - in particular, we want to avoid loading
|
|
# an `EpochRef` and checking signatures. This reordering might lead to
|
|
# different IGNORE/REJECT results in turn affecting gossip scores.
|
|
|
|
template aggregate_and_proof: untyped = signedAggregateAndProof.message
|
|
template aggregate: untyped = aggregate_and_proof.aggregate
|
|
|
|
# [REJECT] The aggregate attestation's epoch matches its target -- i.e.
|
|
# `aggregate.data.target.epoch == compute_epoch_at_slot(aggregate.data.slot)`
|
|
let slot = block:
|
|
let v = check_attestation_slot_target(aggregate.data)
|
|
if v.isErr():
|
|
return pool.checkedReject(v.error)
|
|
v.get()
|
|
|
|
# [IGNORE] aggregate.data.slot is within the last
|
|
# ATTESTATION_PROPAGATION_SLOT_RANGE slots (with a
|
|
# MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e. aggregate.data.slot +
|
|
# ATTESTATION_PROPAGATION_SLOT_RANGE >= current_slot >= aggregate.data.slot
|
|
#
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.2/specs/deneb/p2p-interface.md#beacon_aggregate_and_proof
|
|
# modifies this for Deneb and newer forks.
|
|
block:
|
|
let v = check_propagation_slot_range(
|
|
pool.dag.cfg.consensusForkAtEpoch(wallTime.slotOrZero.epoch), slot,
|
|
wallTime)
|
|
if v.isErr(): # [IGNORE]
|
|
return err(v.error())
|
|
|
|
# [IGNORE] The aggregate is the first valid aggregate received for the
|
|
# aggregator with index aggregate_and_proof.aggregator_index for the epoch
|
|
# aggregate.data.target.epoch.
|
|
# Slightly modified to allow only newer attestations than were previously
|
|
# seen (no point in propagating older votes)
|
|
if (pool.nextAttestationEpoch.lenu64 >
|
|
aggregate_and_proof.aggregator_index) and
|
|
pool.nextAttestationEpoch[
|
|
aggregate_and_proof.aggregator_index].aggregate >
|
|
aggregate.data.target.epoch:
|
|
return errIgnore("Aggregate: validator has already aggregated in epoch")
|
|
|
|
# [REJECT] The attestation has participants -- that is,
|
|
# len(get_attesting_indices(state, aggregate.data, aggregate.aggregation_bits)) >= 1.
|
|
#
|
|
# get_attesting_indices() is:
|
|
# committee = get_beacon_committee(state, data.slot, data.index)
|
|
# return set(index for i, index in enumerate(committee) if bits[i])
|
|
#
|
|
# the attestation doesn't have participants is iff either:
|
|
# (1) the aggregation bits are all 0; or
|
|
# (2) the non-zero aggregation bits don't overlap with extant committee
|
|
# members, i.e. they counts don't match.
|
|
# But (2) would reflect an invalid aggregation in other ways, so reject it
|
|
# either way.
|
|
block:
|
|
let v = check_aggregation_count(aggregate, singular = false)
|
|
if v.isErr(): # [REJECT]
|
|
return pool.checkedReject(v.error)
|
|
|
|
# [REJECT] The block being voted for (aggregate.data.beacon_block_root)
|
|
# passes validation.
|
|
# [IGNORE] if block is unseen so far and enqueue it in missing blocks
|
|
let target = block:
|
|
let v = check_beacon_and_target_block(pool[], aggregate.data)
|
|
if v.isErr(): # [IGNORE/REJECT]
|
|
return pool.checkedResult(v.error)
|
|
v.get()
|
|
|
|
let
|
|
shufflingRef =
|
|
pool.dag.getShufflingRef(target.blck, target.slot.epoch, false).valueOr:
|
|
# Target is verified - shouldn't happen
|
|
warn "No shuffling for attestation - report bug",
|
|
aggregate = shortLog(aggregate), target = shortLog(target)
|
|
return errIgnore("Aggregate: no shuffling")
|
|
|
|
# [REJECT] The committee index is within the expected range -- i.e.
|
|
# data.index < get_committee_count_per_slot(state, data.target.epoch).
|
|
let committee_index = block:
|
|
let idx = shufflingRef.get_committee_index(aggregate.data.index)
|
|
if idx.isErr():
|
|
return pool.checkedReject(
|
|
"Attestation: committee index not within expected range")
|
|
idx.get()
|
|
if not aggregate.aggregation_bits.compatible_with_shuffling(
|
|
shufflingRef, slot, committee_index):
|
|
return pool.checkedReject(
|
|
"Aggregate: number of aggregation bits and committee size mismatch")
|
|
|
|
if checkCover and
|
|
pool[].covers(aggregate.data, aggregate.aggregation_bits):
|
|
# [IGNORE] A valid aggregate attestation defined by
|
|
# `hash_tree_root(aggregate.data)` whose `aggregation_bits` is a non-strict
|
|
# superset has _not_ already been seen.
|
|
# https://github.com/ethereum/consensus-specs/pull/2847
|
|
return errIgnore("Aggregate: already covered")
|
|
|
|
# [REJECT] aggregate_and_proof.selection_proof selects the validator as an
|
|
# aggregator for the slot -- i.e. is_aggregator(state, aggregate.data.slot,
|
|
# aggregate.data.index, aggregate_and_proof.selection_proof) returns True.
|
|
if not is_aggregator(
|
|
shufflingRef, slot, committee_index, aggregate_and_proof.selection_proof):
|
|
return pool.checkedReject("Aggregate: incorrect aggregator")
|
|
|
|
# [REJECT] The aggregator's validator index is within the committee -- i.e.
|
|
# aggregate_and_proof.aggregator_index in get_beacon_committee(state,
|
|
# aggregate.data.slot, aggregate.data.index).
|
|
|
|
let aggregator_index =
|
|
ValidatorIndex.init(aggregate_and_proof.aggregator_index).valueOr:
|
|
return pool.checkedReject("Aggregate: invalid aggregator index")
|
|
|
|
if aggregator_index notin
|
|
get_beacon_committee(shufflingRef, slot, committee_index):
|
|
return pool.checkedReject(
|
|
"Aggregate: aggregator's validator index not in committee")
|
|
|
|
# 1. [REJECT] The aggregate_and_proof.selection_proof is a valid signature
|
|
# of the aggregate.data.slot by the validator with index
|
|
# aggregate_and_proof.aggregator_index.
|
|
# get_slot_signature(state, aggregate.data.slot, privkey)
|
|
# 2. [REJECT] The aggregator signature,
|
|
# signed_aggregate_and_proof.signature, is valid.
|
|
# 3. [REJECT] The signature of aggregate is valid.
|
|
|
|
let
|
|
fork = pool.dag.forkAtEpoch(aggregate.data.slot.epoch)
|
|
attesting_indices = get_attesting_indices(
|
|
shufflingRef, slot, committee_index, aggregate.aggregation_bits)
|
|
|
|
let
|
|
sig = if checkSignature:
|
|
let deferredCrypto = batchCrypto
|
|
.scheduleAggregateChecks(
|
|
fork, signedAggregateAndProof, pool.dag,
|
|
attesting_indices
|
|
)
|
|
if deferredCrypto.isErr():
|
|
return pool.checkedReject(deferredCrypto.error)
|
|
|
|
let
|
|
(aggregatorFut, slotFut, aggregateFut, sig) = deferredCrypto.get()
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature,
|
|
# signed_aggregate_and_proof.signature, is valid.
|
|
let x = await aggregatorFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return pool.checkedReject("Aggregate: invalid aggregator signature")
|
|
of BatchResult.Timeout:
|
|
beacon_aggregates_dropped_queue_full.inc()
|
|
return errIgnore("Aggregate: timeout checking aggregator signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
# [REJECT] aggregate_and_proof.selection_proof
|
|
let x = await slotFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return pool.checkedReject("Aggregate: invalid slot signature")
|
|
of BatchResult.Timeout:
|
|
beacon_aggregates_dropped_queue_full.inc()
|
|
return errIgnore("Aggregate: timeout checking slot signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature,
|
|
# signed_aggregate_and_proof.signature, is valid.
|
|
let x = await aggregateFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return pool.checkedReject("Aggregate: invalid aggregate signature")
|
|
of BatchResult.Timeout:
|
|
beacon_aggregates_dropped_queue_full.inc()
|
|
return errIgnore("Aggregate: timeout checking aggregate signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
sig
|
|
else:
|
|
aggregate.signature.load().valueOr:
|
|
return pool.checkedReject("Aggregate: unable to load signature")
|
|
|
|
# The following rule follows implicitly from that we clear out any
|
|
# unviable blocks from the chain dag:
|
|
#
|
|
# [IGNORE] The current finalized_checkpoint is an ancestor of the block
|
|
# defined by aggregate.data.beacon_block_root -- i.e.
|
|
# get_checkpoint_block(store, aggregate.data.beacon_block_root,
|
|
# finalized_checkpoint.epoch) == store.finalized_checkpoint.root
|
|
|
|
# Only valid aggregates go in the list
|
|
if pool.nextAttestationEpoch.lenu64 <= aggregate_and_proof.aggregator_index:
|
|
pool.nextAttestationEpoch.setLen(
|
|
aggregate_and_proof.aggregator_index.int + 1)
|
|
pool.nextAttestationEpoch[aggregate_and_proof.aggregator_index].aggregate =
|
|
aggregate.data.target.epoch + 1
|
|
|
|
return ok((attesting_indices, sig))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/capella/p2p-interface.md#bls_to_execution_change
|
|
proc validateBlsToExecutionChange*(
|
|
pool: ValidatorChangePool, batchCrypto: ref BatchCrypto,
|
|
signed_address_change: SignedBLSToExecutionChange,
|
|
wallEpoch: Epoch): Future[Result[void, ValidationError]] {.async: (raises: [CancelledError]).} =
|
|
# [IGNORE] `current_epoch >= CAPELLA_FORK_EPOCH`, where `current_epoch` is
|
|
# defined by the current wall-clock time.
|
|
if not (wallEpoch >= pool.dag.cfg.CAPELLA_FORK_EPOCH):
|
|
return errIgnore(
|
|
"SignedBLSToExecutionChange: not accepting gossip until Capella")
|
|
|
|
# [IGNORE] The `signed_bls_to_execution_change` is the first valid signed bls
|
|
# to execution change received for the validator with index
|
|
# `signed_bls_to_execution_change.message.validator_index`.
|
|
if pool.isSeen(signed_address_change):
|
|
return errIgnore(
|
|
"SignedBLSToExecutionChange: not first valid change for validator index")
|
|
|
|
# [REJECT] All of the conditions within `process_bls_to_execution_change`
|
|
# pass validation.
|
|
withState(pool.dag.headState):
|
|
when consensusFork < ConsensusFork.Capella:
|
|
return errIgnore(
|
|
"SignedBLSToExecutionChange: can't validate against pre-Capella state")
|
|
else:
|
|
let res = check_bls_to_execution_change(
|
|
pool.dag.cfg.genesisFork, forkyState.data, signed_address_change,
|
|
{skipBlsValidation})
|
|
if res.isErr:
|
|
return pool.checkedReject(res.error)
|
|
|
|
# BLS to execution change signatures are batch-verified
|
|
let deferredCrypto = batchCrypto.scheduleBlsToExecutionChangeCheck(
|
|
pool.dag.cfg.genesisFork, signed_address_change)
|
|
if deferredCrypto.isErr():
|
|
return pool.checkedReject(deferredCrypto.error)
|
|
|
|
let (cryptoFut, _) = deferredCrypto.get()
|
|
case await cryptoFut
|
|
of BatchResult.Invalid:
|
|
return pool.checkedReject(
|
|
"SignedBLSToExecutionChange: invalid signature")
|
|
of BatchResult.Timeout:
|
|
return errIgnore(
|
|
"SignedBLSToExecutionChange: timeout checking signature")
|
|
of BatchResult.Valid:
|
|
discard # keep going only in this case
|
|
|
|
# Send notification about new BLS to execution change via callback
|
|
if not(isNil(pool.onBLSToExecutionChangeReceived)):
|
|
pool.onBLSToExecutionChangeReceived(signed_address_change)
|
|
|
|
return ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#attester_slashing
|
|
proc validateAttesterSlashing*(
|
|
pool: ValidatorChangePool, attester_slashing: phase0.AttesterSlashing):
|
|
Result[void, ValidationError] =
|
|
# [IGNORE] At least one index in the intersection of the attesting indices of
|
|
# each attestation has not yet been seen in any prior attester_slashing (i.e.
|
|
# attester_slashed_indices = set(attestation_1.attesting_indices).intersection(attestation_2.attesting_indices),
|
|
# verify if any(attester_slashed_indices.difference(prior_seen_attester_slashed_indices))).
|
|
if pool.isSeen(attester_slashing):
|
|
return errIgnore(
|
|
"AttesterSlashing: attester-slashed index already attester-slashed")
|
|
|
|
# [REJECT] All of the conditions within process_attester_slashing pass
|
|
# validation.
|
|
let attester_slashing_validity =
|
|
check_attester_slashing(pool.dag.headState, attester_slashing, {})
|
|
if attester_slashing_validity.isErr:
|
|
return pool.checkedReject(attester_slashing_validity.error)
|
|
|
|
# Send notification about new attester slashing via callback
|
|
if not(isNil(pool.onAttesterSlashingReceived)):
|
|
pool.onAttesterSlashingReceived(attester_slashing)
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.4/specs/phase0/p2p-interface.md#proposer_slashing
|
|
proc validateProposerSlashing*(
|
|
pool: ValidatorChangePool, proposer_slashing: ProposerSlashing):
|
|
Result[void, ValidationError] =
|
|
# Not from spec; the rest of NBC wouldn't have correctly processed it either.
|
|
if proposer_slashing.signed_header_1.message.proposer_index > int.high.uint64:
|
|
return errIgnore("ProposerSlashing: proposer-slashed index too high")
|
|
|
|
# [IGNORE] The proposer slashing is the first valid proposer slashing
|
|
# received for the proposer with index
|
|
# proposer_slashing.signed_header_1.message.proposer_index.
|
|
if pool.isSeen(proposer_slashing):
|
|
return errIgnore(
|
|
"ProposerSlashing: proposer-slashed index already proposer-slashed")
|
|
|
|
# [REJECT] All of the conditions within process_proposer_slashing
|
|
# pass validation.
|
|
let proposer_slashing_validity =
|
|
check_proposer_slashing(pool.dag.headState, proposer_slashing, {})
|
|
if proposer_slashing_validity.isErr:
|
|
return pool.checkedReject(proposer_slashing_validity.error)
|
|
|
|
# Send notification about new proposer slashing via callback
|
|
if not(isNil(pool.onProposerSlashingReceived)):
|
|
pool.onProposerSlashingReceived(proposer_slashing)
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/phase0/p2p-interface.md#voluntary_exit
|
|
proc validateVoluntaryExit*(
|
|
pool: ValidatorChangePool, signed_voluntary_exit: SignedVoluntaryExit):
|
|
Result[void, ValidationError] =
|
|
# [IGNORE] The voluntary exit is the first valid voluntary exit received for
|
|
# the validator with index signed_voluntary_exit.message.validator_index.
|
|
if signed_voluntary_exit.message.validator_index >=
|
|
getStateField(pool.dag.headState, validators).lenu64:
|
|
return errIgnore("VoluntaryExit: validator index too high")
|
|
|
|
# Given that getStateField(pool.dag.headState, validators) is a seq,
|
|
# signed_voluntary_exit.message.validator_index.int is already valid, but
|
|
# check explicitly if one changes that data structure.
|
|
if pool.isSeen(signed_voluntary_exit):
|
|
return errIgnore(
|
|
"VoluntaryExit: validator index already voluntarily exited")
|
|
|
|
# [REJECT] All of the conditions within process_voluntary_exit pass
|
|
# validation.
|
|
let voluntary_exit_validity =
|
|
check_voluntary_exit(
|
|
pool.dag.cfg, pool.dag.headState, signed_voluntary_exit, {})
|
|
if voluntary_exit_validity.isErr:
|
|
return pool.checkedReject(voluntary_exit_validity.error)
|
|
|
|
# Send notification about new voluntary exit via callback
|
|
if not(isNil(pool.onVoluntaryExitReceived)):
|
|
pool.onVoluntaryExitReceived(signed_voluntary_exit)
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/p2p-interface.md#sync_committee_subnet_id
|
|
proc validateSyncCommitteeMessage*(
|
|
dag: ChainDAGRef,
|
|
quarantine: ref Quarantine,
|
|
batchCrypto: ref BatchCrypto,
|
|
syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
|
|
msg: SyncCommitteeMessage,
|
|
subcommitteeIdx: SyncSubcommitteeIndex,
|
|
wallTime: BeaconTime,
|
|
checkSignature: bool):
|
|
Future[Result[
|
|
(BlockId, CookedSig, seq[uint64]), ValidationError]] {.async: (raises: [CancelledError]).} =
|
|
block:
|
|
# [IGNORE] The message's slot is for the current slot (with a
|
|
# `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance), i.e.
|
|
# `sync_committee_message.slot == current_slot`.
|
|
let v = check_slot_exact(msg.slot, wallTime)
|
|
if v.isErr():
|
|
return err(v.error())
|
|
|
|
# [REJECT] The subnet_id is valid for the given validator
|
|
# i.e. subnet_id in compute_subnets_for_sync_committee(state, sync_committee_message.validator_index).
|
|
# Note this validation implies the validator is part of the broader
|
|
# current sync committee along with the correct subcommittee.
|
|
# This check also ensures that the validator index is in range
|
|
let positionsInSubcommittee = dag.getSubcommitteePositions(
|
|
msg.slot + 1, subcommitteeIdx, msg.validator_index)
|
|
|
|
if positionsInSubcommittee.len == 0:
|
|
return dag.checkedReject(
|
|
"SyncCommitteeMessage: originator not part of sync committee")
|
|
|
|
# [IGNORE] The block being signed (`sync_committee_message.beacon_block_root`)
|
|
# has been seen (via both gossip and non-gossip sources) (a client MAY queue
|
|
# sync committee messages for processing once block is received)
|
|
# [REJECT] The block being signed (`sync_committee_message.beacon_block_root`)
|
|
# passes validation.
|
|
let
|
|
blockRoot = msg.beacon_block_root
|
|
blck = dag.getBlockRef(blockRoot).valueOr:
|
|
if blockRoot in quarantine[].unviable:
|
|
return dag.checkedReject("SyncCommitteeMessage: target invalid")
|
|
quarantine[].addMissing(blockRoot)
|
|
return errIgnore("SyncCommitteeMessage: target not found")
|
|
|
|
block:
|
|
# [IGNORE] There has been no other valid sync committee message for the
|
|
# declared `slot` for the validator referenced by
|
|
# `sync_committee_message.validator_index`
|
|
#
|
|
# Note this validation is per topic so that for a given slot, multiple
|
|
# messages could be forwarded with the same validator_index as long as
|
|
# the subnet_ids are distinct.
|
|
if syncCommitteeMsgPool[].isSeen(msg, subcommitteeIdx, dag.head.bid):
|
|
return errIgnore("SyncCommitteeMessage: duplicate message")
|
|
|
|
# [REJECT] The signature is valid for the message beacon_block_root for the
|
|
# validator referenced by validator_index.
|
|
let
|
|
senderPubKey = dag.validatorKey(msg.validator_index).valueOr:
|
|
return dag.checkedReject("SyncCommitteeMessage: invalid validator index")
|
|
|
|
let sig =
|
|
if checkSignature:
|
|
# Attestation signatures are batch-verified
|
|
let deferredCrypto = batchCrypto
|
|
.scheduleSyncCommitteeMessageCheck(
|
|
dag.forkAtEpoch(msg.slot.epoch),
|
|
msg.slot, msg.beacon_block_root,
|
|
senderPubKey, msg.signature)
|
|
if deferredCrypto.isErr():
|
|
return dag.checkedReject(deferredCrypto.error)
|
|
|
|
# Await the crypto check
|
|
let
|
|
(cryptoFut, sig) = deferredCrypto.get()
|
|
|
|
let x = (await cryptoFut)
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return dag.checkedReject("SyncCommitteeMessage: invalid signature")
|
|
of BatchResult.Timeout:
|
|
beacon_sync_messages_dropped_queue_full.inc()
|
|
return errIgnore("SyncCommitteeMessage: timeout checking signature")
|
|
of BatchResult.Valid:
|
|
sig # keep going only in this case
|
|
else:
|
|
msg.signature.load().valueOr:
|
|
return dag.checkedReject(
|
|
"SyncCommitteeMessage: unable to load signature")
|
|
|
|
return ok((blck.bid, sig, positionsInSubcommittee))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/p2p-interface.md#sync_committee_contribution_and_proof
|
|
proc validateContribution*(
|
|
dag: ChainDAGRef,
|
|
quarantine: ref Quarantine,
|
|
batchCrypto: ref BatchCrypto,
|
|
syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
|
|
msg: SignedContributionAndProof,
|
|
wallTime: BeaconTime,
|
|
checkSignature: bool
|
|
): Future[Result[
|
|
(BlockId, CookedSig, seq[ValidatorIndex]), ValidationError]] {.async: (raises: [CancelledError]).} =
|
|
block:
|
|
# [IGNORE] The contribution's slot is for the current slot
|
|
# (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance)
|
|
# i.e. contribution.slot == current_slot.
|
|
let v = check_slot_exact(msg.message.contribution.slot, wallTime)
|
|
if v.isErr(): # [IGNORE]
|
|
return err(v.error())
|
|
|
|
# [REJECT] The subcommittee index is in the allowed range
|
|
# i.e. contribution.subcommittee_index < SYNC_COMMITTEE_SUBNET_COUNT.
|
|
let subcommitteeIdx = SyncSubcommitteeIndex.init(
|
|
msg.message.contribution.subcommittee_index).valueOr:
|
|
return dag.checkedReject("Contribution: subcommittee index too high")
|
|
|
|
# [REJECT] The contribution has participants
|
|
# that is, any(contribution.aggregation_bits).
|
|
if msg.message.contribution.aggregation_bits.isZeros:
|
|
return dag.checkedReject("Contribution: aggregation bits empty")
|
|
|
|
# [REJECT] contribution_and_proof.selection_proof selects the validator
|
|
# as an aggregator for the slot
|
|
# i.e. is_sync_committee_aggregator(contribution_and_proof.selection_proof)
|
|
# returns True.
|
|
if not is_sync_committee_aggregator(msg.message.selection_proof):
|
|
return dag.checkedReject("Contribution: invalid selection_proof")
|
|
|
|
# [IGNORE] The sync committee contribution is the first valid
|
|
# contribution received for the aggregator with index
|
|
# contribution_and_proof.aggregator_index for the slot contribution.slot
|
|
# and subcommittee index contribution.subcommittee_index
|
|
# (this requires maintaining a cache of size SYNC_COMMITTEE_SIZE for this
|
|
# topic that can be flushed after each slot).
|
|
if syncCommitteeMsgPool[].isSeen(msg.message):
|
|
return errIgnore("Contribution: validator has already aggregated in slot")
|
|
|
|
# [REJECT] The aggregator's validator index is in the declared subcommittee
|
|
# of the current sync committee.
|
|
# i.e. state.validators[contribution_and_proof.aggregator_index].pubkey in
|
|
# get_sync_subcommittee_pubkeys(state, contribution.subcommittee_index).
|
|
let
|
|
aggregator_index =
|
|
ValidatorIndex.init(msg.message.aggregator_index).valueOr:
|
|
return dag.checkedReject("Contribution: invalid aggregator index")
|
|
# TODO we take a copy of the participants to avoid the data going stale
|
|
# between validation and use - nonetheless, a design that avoids it and
|
|
# stays safe would be nice
|
|
participants = dag.syncCommitteeParticipants(
|
|
msg.message.contribution.slot + 1, subcommitteeIdx)
|
|
if aggregator_index notin participants:
|
|
return dag.checkedReject("Contribution: aggregator not in subcommittee")
|
|
|
|
# [IGNORE] The block being signed
|
|
# (`contribution_and_proof.contribution.beacon_block_root`) has been seen
|
|
# (via both gossip and non-gossip sources) (a client MAY queue sync committee
|
|
# contributions for processing once block is received)
|
|
# [REJECT] The block being signed
|
|
# (`contribution_and_proof.contribution.beacon_block_root`) passes validation.
|
|
let
|
|
blockRoot = msg.message.contribution.beacon_block_root
|
|
blck = dag.getBlockRef(blockRoot).valueOr:
|
|
if blockRoot in quarantine[].unviable:
|
|
return dag.checkedReject("Contribution: target invalid")
|
|
quarantine[].addMissing(blockRoot)
|
|
return errIgnore("Contribution: target not found")
|
|
|
|
# [IGNORE] A valid sync committee contribution with equal `slot`,
|
|
# `beacon_block_root` and `subcommittee_index` whose `aggregation_bits`
|
|
# is non-strict superset has _not_ already been seen.
|
|
if syncCommitteeMsgPool[].covers(msg.message.contribution, blck.bid):
|
|
return errIgnore("Contribution: already covered")
|
|
|
|
let sig = if checkSignature:
|
|
let deferredCrypto = batchCrypto.scheduleContributionChecks(
|
|
dag.forkAtEpoch(msg.message.contribution.slot.epoch),
|
|
msg, subcommitteeIdx, dag)
|
|
if deferredCrypto.isErr():
|
|
return dag.checkedReject(deferredCrypto.error)
|
|
|
|
let
|
|
(aggregatorFut, proofFut, contributionFut, sig) = deferredCrypto.get()
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature,
|
|
# `signed_contribution_and_proof.signature`, is valid.
|
|
let x = await aggregatorFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return dag.checkedReject(
|
|
"Contribution: invalid aggregator signature")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore(
|
|
"Contribution: timeout checking aggregator signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
# [REJECT] The `contribution_and_proof.selection_proof`
|
|
# is a valid signature of the `SyncAggregatorSelectionData`
|
|
# derived from the `contribution` by the validator with index
|
|
# `contribution_and_proof.aggregator_index`.
|
|
let x = await proofFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return dag.checkedReject("Contribution: invalid proof")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore("Contribution: timeout checking proof")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
# [REJECT] The aggregate signature is valid for the message
|
|
# `beacon_block_root` and aggregate pubkey derived from the
|
|
# participation info in `aggregation_bits` for the subcommittee
|
|
# specified by the `contribution.subcommittee_index`.
|
|
let x = await contributionFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return dag.checkedReject(
|
|
"Contribution: invalid contribution signature")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore(
|
|
"Contribution: timeout checking contribution signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
sig
|
|
else:
|
|
msg.message.contribution.signature.load().valueOr:
|
|
return dag.checkedReject("SyncCommitteeMessage: unable to load signature")
|
|
|
|
return ok((blck.bid, sig, participants))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#light_client_finality_update
|
|
proc validateLightClientFinalityUpdate*(
|
|
pool: var LightClientPool, dag: ChainDAGRef,
|
|
finality_update: ForkedLightClientFinalityUpdate,
|
|
wallTime: BeaconTime): Result[void, ValidationError] =
|
|
# [IGNORE] The `finalized_header.beacon.slot` is greater than that of all
|
|
# previously forwarded `finality_update`s, or it matches the highest
|
|
# previously forwarded slot and also has a `sync_aggregate` indicating
|
|
# supermajority (> 2/3) sync committee participation while the previously
|
|
# forwarded `finality_update` for that slot did not indicate supermajority
|
|
let finalized_slot = withForkyFinalityUpdate(finality_update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyFinalityUpdate.finalized_header.beacon.slot
|
|
else:
|
|
GENESIS_SLOT
|
|
if finalized_slot < pool.latestForwardedFinalitySlot:
|
|
return errIgnore("LightClientFinalityUpdate: slot already forwarded")
|
|
let has_supermajority = withForkyFinalityUpdate(finality_update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyFinalityUpdate.sync_aggregate.hasSupermajoritySyncParticipation
|
|
else:
|
|
false
|
|
if finalized_slot == pool.latestForwardedFinalitySlot:
|
|
if pool.latestForwardedFinalityHasSupermajority:
|
|
return errIgnore("LightClientFinalityUpdate: already have supermajority")
|
|
if not has_supermajority:
|
|
return errIgnore("LightClientFinalityUpdate: no new supermajority")
|
|
|
|
let
|
|
signature_slot = withForkyFinalityUpdate(finality_update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyFinalityUpdate.signature_slot
|
|
else:
|
|
GENESIS_SLOT
|
|
currentTime = wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY
|
|
forwardTime = signature_slot.light_client_finality_update_time
|
|
if currentTime < forwardTime:
|
|
# [IGNORE] The `finality_update` is received after the block at
|
|
# `signature_slot` was given enough time to propagate through the network.
|
|
return errIgnore("LightClientFinalityUpdate: received too early")
|
|
|
|
if not finality_update.matches(dag.lcDataStore.cache.latest):
|
|
# [IGNORE] The received `finality_update` matches the locally computed one
|
|
# exactly.
|
|
return errIgnore("LightClientFinalityUpdate: not matching local")
|
|
|
|
pool.latestForwardedFinalitySlot = finalized_slot
|
|
pool.latestForwardedFinalityHasSupermajority = has_supermajority
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
|
|
proc validateLightClientOptimisticUpdate*(
|
|
pool: var LightClientPool, dag: ChainDAGRef,
|
|
optimistic_update: ForkedLightClientOptimisticUpdate,
|
|
wallTime: BeaconTime): Result[void, ValidationError] =
|
|
let attested_slot = withForkyOptimisticUpdate(optimistic_update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyOptimisticUpdate.attested_header.beacon.slot
|
|
else:
|
|
GENESIS_SLOT
|
|
if attested_slot <= pool.latestForwardedOptimisticSlot:
|
|
# [IGNORE] The `attested_header.beacon.slot` is greater than that of all
|
|
# previously forwarded `optimistic_update`s
|
|
return errIgnore("LightClientOptimisticUpdate: slot already forwarded")
|
|
|
|
let
|
|
signature_slot = withForkyOptimisticUpdate(optimistic_update):
|
|
when lcDataFork > LightClientDataFork.None:
|
|
forkyOptimisticUpdate.signature_slot
|
|
else:
|
|
GENESIS_SLOT
|
|
currentTime = wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY
|
|
forwardTime = signature_slot.light_client_optimistic_update_time
|
|
if currentTime < forwardTime:
|
|
# [IGNORE] The `optimistic_update` is received after the block at
|
|
# `signature_slot` was given enough time to propagate through the network.
|
|
return errIgnore("LightClientOptimisticUpdate: received too early")
|
|
|
|
if not optimistic_update.matches(dag.lcDataStore.cache.latest):
|
|
# [IGNORE] The received `optimistic_update` matches the locally computed one
|
|
# exactly.
|
|
return errIgnore("LightClientOptimisticUpdate: not matching local")
|
|
|
|
pool.latestForwardedOptimisticSlot = attested_slot
|
|
ok()
|