1051 lines
45 KiB
Nim
1051 lines
45 KiB
Nim
# beacon_chain
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# Copyright (c) 2019-2022 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: [Defect].}
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# References to `vFuture` refer to the pre-release proposal of the libp2p based
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# light client sync protocol. Conflicting release versions are not in use.
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# https://github.com/ethereum/consensus-specs/pull/2802
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import
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# Status
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chronicles, chronos, metrics,
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stew/results,
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# Internals
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../spec/datatypes/[phase0, altair, bellatrix],
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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, block_quarantine, exit_pool, spec_cache,
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sync_committee_msg_pool],
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".."/[beacon_clock],
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./batch_validation
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from libp2p/protocols/pubsub/pubsub 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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msgSlot: Slot, wallTime: BeaconTime): Result[Slot, ValidationError] =
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let
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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
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pastSlot = (wallTime - MAXIMUM_GOSSIP_CLOCK_DISPARITY).toSlot()
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# https://github.com/ethereum/consensus-specs/blob/v1.1.10/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 ATTESTATION_PROPAGATION_SLOT_RANGE = 28
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if pastSlot.afterGenesis and
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msgSlot + ATTESTATION_PROPAGATION_SLOT_RANGE < pastSlot.slot:
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return errIgnore("Attestation 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. get_ancestor(store,
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# attestation.data.beacon_block_root,
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# compute_start_slot_at_epoch(attestation.data.target.epoch)) ==
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# 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
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target = blck.atSlot(data.target.epoch.start_slot())
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if isNil(target.blck):
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# Shouldn't happen - we've checked that the target epoch is within range
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# already
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return errReject("Attestation target block not found")
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if not (target.blck.root == data.target.root):
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return errReject(
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"Attestation target block not the correct ancestor of LMD vote block")
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ok(target)
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func check_aggregation_count(
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attestation: Attestation, singular: bool): 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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epochRef: EpochRef, 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(epochRef), 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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# Gossip Validation
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# ----------------------------------------------------------------
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template checkedReject(msg: cstring): untyped =
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if verifyFinalization in pool.dag.updateFlags:
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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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raiseAssert $msg
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errReject(msg)
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template checkedReject(error: ValidationError): untyped =
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doAssert error[0] == ValidationResult.Reject
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if verifyFinalization in pool.dag.updateFlags:
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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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raiseAssert $error[1]
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err(error)
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template validateBeaconBlockBellatrix(
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signed_beacon_block: phase0.SignedBeaconBlock |
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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/v1.1.7/specs/merge/p2p-interface.md#beacon_block
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template validateBeaconBlockBellatrix(
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signed_beacon_block: bellatrix.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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let executionEnabled =
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if signed_beacon_block.message.body.execution_payload !=
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default(ExecutionPayload):
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true
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elif dag.getEpochRef(parent, parent.slot.epoch, true).expect(
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"parent EpochRef doesn't fail").merge_transition_complete:
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# Should usually be inexpensive, but could require cache refilling - the
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# parent block can be no older than the latest finalized block
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true
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else:
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# Somewhat more expensive fallback, with database I/O, but should be
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# mostly relevant around merge transition epochs. It's possible that
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# the previous block is phase 0 or Altair, if this is the transition
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# block itself.
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let blockData = dag.getForkedBlock(parent.bid)
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if blockData.isOk():
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case blockData.get().kind:
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of BeaconBlockFork.Phase0:
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false
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of BeaconBlockFork.Altair:
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false
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of BeaconBlockFork.Bellatrix:
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# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/bellatrix/beacon-chain.md#process_execution_payload
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# shows how this gets folded into the state each block; checking this
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# is equivalent, without ever requiring state replay or any similarly
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# expensive computation.
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blockData.get().bellatrixData.message.body.execution_payload !=
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default(ExecutionPayload)
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else:
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warn "Cannot load block parent, assuming execution is disabled",
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parent = shortLog(parent)
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false
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if executionEnabled:
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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(state.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 errReject("BeaconBlock: Mismatched execution payload timestamp")
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# https://github.com/ethereum/consensus-specs/blob/v1.1.9/specs/phase0/p2p-interface.md#beacon_block
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# https://github.com/ethereum/consensus-specs/blob/v1.1.8/specs/bellatrix/p2p-interface.md#beacon_block
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proc validateBeaconBlock*(
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dag: ChainDAGRef, quarantine: ref Quarantine,
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signed_beacon_block: phase0.SignedBeaconBlock | altair.SignedBeaconBlock |
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bellatrix.SignedBeaconBlock,
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wallTime: BeaconTime, flags: UpdateFlags): Result[void, ValidationError] =
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# In general, checks are ordered from cheap to expensive. Especially, crypto
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# verification could be quite a bit more expensive than the rest. This is an
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# externally easy-to-invoke function by tossing network packets at the node.
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# [IGNORE] The block 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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# signed_beacon_block.message.slot <= current_slot (a client MAY queue future
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# blocks for processing at the appropriate slot).
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if not (signed_beacon_block.message.slot <=
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(wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).slotOrZero):
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return errIgnore("BeaconBlock: slot too high")
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# [IGNORE] The block is from a slot greater than the latest finalized slot --
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# i.e. validate that signed_beacon_block.message.slot >
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# compute_start_slot_at_epoch(state.finalized_checkpoint.epoch)
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if not (signed_beacon_block.message.slot > dag.finalizedHead.slot):
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return errIgnore("BeaconBlock: slot already finalized")
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# [IGNORE] The block is the first block with valid signature received for the
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# proposer for the slot, signed_beacon_block.message.slot.
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#
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# While this condition is similar to the proposer slashing condition at
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# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/validator.md#proposer-slashing
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# it's not identical, and this check does not address slashing:
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#
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# (1) The beacon blocks must be conflicting, i.e. different, for the same
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# slot and proposer. This check also catches identical blocks.
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#
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# (2) By this point in the function, it's not been checked whether they're
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# signed yet. As in general, expensive checks should be deferred, this
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# would add complexity not directly relevant this function.
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#
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# (3) As evidenced by point (1), the similarity in the validation condition
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# and slashing condition, while not coincidental, aren't similar enough
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# to combine, as one or the other might drift.
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#
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# (4) Furthermore, this function, as much as possible, simply returns a yes
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# or no answer, without modifying other state for p2p network interface
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# validation. Complicating this interface, for the sake of sharing only
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# couple lines of code, wouldn't be worthwhile.
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#
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# TODO might check unresolved/orphaned blocks too, and this might not see all
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# blocks at a given slot (though, in theory, those get checked elsewhere), or
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# adding metrics that count how often these conditions occur.
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if dag.containsForkBlock(signed_beacon_block.root):
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# The gossip algorithm itself already does one round of hashing to find
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# already-seen data, but it is fairly aggressive about forgetting about
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# what it has seen already
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# "[IGNORE] The block is the first block ..."
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return errIgnore("BeaconBlock: already seen")
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let
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slotBlock = getBlockAtSlot(dag, signed_beacon_block.message.slot)
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if slotBlock.isSome() and slotBlock.get().isProposed() and
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slotBlock.get().blck.slot == signed_beacon_block.message.slot:
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let curBlock = dag.getForkedBlock(slotBlock.get().blck.bid)
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if curBlock.isOk():
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let data = curBlock.get()
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if getForkedBlockField(data, proposer_index) ==
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signed_beacon_block.message.proposer_index and
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data.signature.toRaw() != signed_beacon_block.signature.toRaw():
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return errIgnore("BeaconBlock: already proposed in the same slot")
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# [IGNORE] The block's parent (defined by block.parent_root) has been seen
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# (via both gossip and non-gossip sources) (a client MAY queue blocks for
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# processing once the parent block is retrieved).
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#
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# And implicitly:
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# [REJECT] The block's parent (defined by block.parent_root) passes validation.
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let parent = dag.getBlockRef(signed_beacon_block.message.parent_root).valueOr:
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if signed_beacon_block.message.parent_root in quarantine[].unviable:
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quarantine[].addUnviable(signed_beacon_block.root)
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return errReject("BeaconBlock: parent from unviable fork")
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# When the parent is missing, we can't validate the block - we'll queue it
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# in the quarantine for later processing
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if not quarantine[].addOrphan(
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dag.finalizedHead.slot,
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ForkedSignedBeaconBlock.init(signed_beacon_block)):
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debug "Block quarantine full"
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return errIgnore("BeaconBlock: Parent not found")
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# [REJECT] The block is from a higher slot than its parent.
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if not (signed_beacon_block.message.slot > parent.bid.slot):
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return errReject("BeaconBlock: block not from higher slot than its parent")
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# [REJECT] The current finalized_checkpoint is an ancestor of block -- i.e.
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# get_ancestor(store, block.parent_root,
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# compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)) ==
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# 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("BeaconBlock: 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(signed_beacon_block.root)
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return errReject("BeaconBlock: Finalized checkpoint not an ancestor")
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# [REJECT] The block is proposed by the expected proposer_index for the
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# block's slot in the context of the current shuffling (defined by
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# parent_root/slot). If the proposer_index cannot immediately be verified
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# against the expected shuffling, the block MAY be queued for later
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# processing while proposers for the block's branch are calculated -- in such
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# a case do not REJECT, instead IGNORE this message.
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let
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proposer = getProposer(dag, parent, signed_beacon_block.message.slot)
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if proposer.isNone:
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warn "cannot compute proposer for message"
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return errIgnore("BeaconBlock: Cannot compute proposer") # internal issue
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if uint64(proposer.get()) != signed_beacon_block.message.proposer_index:
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quarantine[].addUnviable(signed_beacon_block.root)
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return errReject("BeaconBlock: Unexpected proposer proposer")
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# [REJECT] The proposer signature, signed_beacon_block.signature, is valid
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# with respect to the proposer_index pubkey.
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if not verify_block_signature(
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dag.forkAtEpoch(signed_beacon_block.message.slot.epoch),
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getStateField(dag.headState, genesis_validators_root),
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signed_beacon_block.message.slot,
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signed_beacon_block.root,
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dag.validatorKey(proposer.get()).get(),
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signed_beacon_block.signature):
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quarantine[].addUnviable(signed_beacon_block.root)
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return errReject("BeaconBlock: Invalid proposer signature")
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validateBeaconBlockBellatrix(signed_beacon_block, parent)
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ok()
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# https://github.com/ethereum/consensus-specs/blob/v1.1.9/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
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proc validateAttestation*(
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pool: ref AttestationPool,
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batchCrypto: ref BatchCrypto,
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attestation: Attestation,
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wallTime: BeaconTime,
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subnet_id: SubnetId, checkSignature: bool):
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Future[Result[
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tuple[attesting_index: ValidatorIndex, sig: CookedSig],
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ValidationError]] {.async.} =
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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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# [REJECT] The attestation's epoch matches its target -- i.e.
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# attestation.data.target.epoch ==
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# compute_epoch_at_slot(attestation.data.slot)
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let slot = block:
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let v = check_attestation_slot_target(attestation.data)
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if v.isErr():
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return errReject(v.error())
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v.get()
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# attestation.data.slot is within the last ATTESTATION_PROPAGATION_SLOT_RANGE
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# slots (within a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) -- i.e.
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# attestation.data.slot + ATTESTATION_PROPAGATION_SLOT_RANGE >= current_slot
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# >= attestation.data.slot (a client MAY queue future attestations for
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# processing at the appropriate slot).
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block:
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let v = check_propagation_slot_range(slot, wallTime) # [IGNORE]
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if v.isErr():
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return err(v.error())
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# The attestation is unaggregated -- that is, it has exactly one
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# participating validator (len([bit for bit in attestation.aggregation_bits
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# if bit == 0b1]) == 1).
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block:
|
|
let v = check_aggregation_count(attestation, singular = true) # [REJECT]
|
|
if v.isErr():
|
|
return 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).
|
|
# 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) # [IGNORE/REJECT]
|
|
if v.isErr():
|
|
return err(v.error)
|
|
v.get()
|
|
|
|
# The following rule follows implicitly from that we clear out any
|
|
# unviable blocks from the chain dag:
|
|
#
|
|
# The current finalized_checkpoint is an ancestor of the block defined by
|
|
# attestation.data.beacon_block_root -- i.e. get_ancestor(store,
|
|
# attestation.data.beacon_block_root,
|
|
# compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)) ==
|
|
# store.finalized_checkpoint.root
|
|
let
|
|
epochRef = block:
|
|
let tmp = pool.dag.getEpochRef(target.blck, target.slot.epoch, false)
|
|
if isErr(tmp): # shouldn't happen since we verified target
|
|
warn "No EpochRef for attestation",
|
|
attestation = shortLog(attestation), target = shortLog(target)
|
|
return errIgnore("Attestation: no EpochRef")
|
|
tmp.get()
|
|
|
|
# [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 = epochRef.get_committee_index(attestation.data.index)
|
|
if idx.isErr():
|
|
return 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(
|
|
epochRef, attestation.data.slot, committee_index, subnet_id) # [REJECT]
|
|
if v.isErr():
|
|
return err(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.lenu64 == get_beacon_committee_len(
|
|
epochRef, attestation.data.slot, committee_index)):
|
|
return checkedReject(
|
|
"Attestation: number of aggregation bits and committee size mismatch")
|
|
|
|
let
|
|
fork = pool.dag.forkAtEpoch(attestation.data.slot.epoch)
|
|
genesis_validators_root =
|
|
getStateField(pool.dag.headState, genesis_validators_root)
|
|
attesting_index = get_attesting_indices_one(
|
|
epochRef, 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 = epochRef.validatorKey(validator_index)
|
|
if pubkey.isNone():
|
|
# can't happen, in theory, because we checked the aggregator index above
|
|
return errIgnore("Attestation: cannot find validator pubkey")
|
|
|
|
# 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, genesis_validators_root, attestation.data,
|
|
pubkey.get(), attestation.signature)
|
|
if deferredCrypto.isErr():
|
|
return checkedReject(deferredCrypto.error)
|
|
|
|
let (cryptoFut, sig) = deferredCrypto.get()
|
|
# Await the crypto check
|
|
var x = (await cryptoFut)
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return 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:
|
|
let sig = attestation.signature.load()
|
|
if not sig.isSome():
|
|
return checkedReject("Attestation: unable to load signature")
|
|
sig.get()
|
|
|
|
# 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/v1.1.9/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
|
|
proc validateAggregate*(
|
|
pool: ref AttestationPool,
|
|
batchCrypto: ref BatchCrypto,
|
|
signedAggregateAndProof: SignedAggregateAndProof,
|
|
wallTime: BeaconTime):
|
|
Future[Result[
|
|
tuple[attestingIndices: seq[ValidatorIndex], sig: CookedSig],
|
|
ValidationError]] {.async.} =
|
|
# 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 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
|
|
block:
|
|
let v = check_propagation_slot_range(slot, wallTime) # [IGNORE]
|
|
if v.isErr():
|
|
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) # [REJECT]
|
|
if v.isErr():
|
|
return err(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) # [IGNORE/REJECT]
|
|
if v.isErr():
|
|
return err(v.error)
|
|
v.get()
|
|
|
|
if pool[].covers(aggregate.data, aggregate.aggregation_bits):
|
|
# https://github.com/ethereum/consensus-specs/issues/2183 - althoughh this
|
|
# check was temporarily removed from the spec, the intent is to reinstate it
|
|
# per discussion in the ticket.
|
|
#
|
|
# [IGNORE] The valid aggregate attestation defined by
|
|
# `hash_tree_root(aggregate)` has _not_ already been seen
|
|
# (via aggregate gossip, within a verified block, or through the creation of
|
|
# an equivalent aggregate locally).
|
|
|
|
# Our implementation of this check is slightly different in that it doesn't
|
|
# consider aggregates from verified blocks - this would take a rather heavy
|
|
# index to work correcly under fork conditions - we also check for coverage
|
|
# of attestation bits instead of comparing with full root of aggreagte:
|
|
# this captures the spirit of the checkk by ignoring aggregates that are
|
|
# strict subsets of other, already-seen aggregates.
|
|
return errIgnore("Aggregate already covered")
|
|
|
|
let
|
|
epochRef = block:
|
|
let tmp = pool.dag.getEpochRef(target.blck, target.slot.epoch, false)
|
|
if tmp.isErr: # shouldn't happen since we verified target
|
|
warn "No EpochRef for attestation - report bug",
|
|
aggregate = shortLog(aggregate), target = shortLog(target)
|
|
return errIgnore("Aggregate: no EpochRef")
|
|
tmp.get()
|
|
|
|
# [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 = epochRef.get_committee_index(aggregate.data.index)
|
|
if idx.isErr():
|
|
return checkedReject("Attestation: committee index not within expected range")
|
|
idx.get()
|
|
|
|
# [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(
|
|
epochRef, slot, committee_index, aggregate_and_proof.selection_proof):
|
|
return 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).
|
|
if aggregate_and_proof.aggregator_index.ValidatorIndex notin
|
|
get_beacon_committee(epochRef, slot, committee_index):
|
|
return 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)
|
|
genesis_validators_root =
|
|
getStateField(pool.dag.headState, genesis_validators_root)
|
|
attesting_indices = get_attesting_indices(
|
|
epochRef, slot, committee_index, aggregate.aggregation_bits)
|
|
|
|
let deferredCrypto = batchCrypto
|
|
.scheduleAggregateChecks(
|
|
fork, genesis_validators_root,
|
|
signed_aggregate_and_proof, epochRef, attesting_indices
|
|
)
|
|
if deferredCrypto.isErr():
|
|
return checkedReject(deferredCrypto.error)
|
|
|
|
let
|
|
(aggregatorFut, slotFut, aggregateFut, sig) = deferredCrypto.get()
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature, signed_aggregate_and_proof.signature, is valid.
|
|
var x = await aggregatorFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return 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
|
|
var x = await slotFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return 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.
|
|
var x = await aggregateFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return 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
|
|
|
|
# The following rule follows implicitly from that we clear out any
|
|
# unviable blocks from the chain dag:
|
|
#
|
|
# The current finalized_checkpoint is an ancestor of the block defined by
|
|
# aggregate.data.beacon_block_root -- i.e. get_ancestor(store,
|
|
# aggregate.data.beacon_block_root,
|
|
# compute_start_slot_at_epoch(store.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/v1.1.10/specs/phase0/p2p-interface.md#attester_slashing
|
|
proc validateAttesterSlashing*(
|
|
pool: ExitPool, attester_slashing: 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))).
|
|
# TODO sequtils2 should be able to make this more reasonable, from asSeq on
|
|
# down, and can sort and just find intersection that way
|
|
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 err((ValidationResult.Reject, attester_slashing_validity.error))
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#proposer_slashing
|
|
proc validateProposerSlashing*(
|
|
pool: ExitPool, 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 > high(int).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 err((ValidationResult.Reject, proposer_slashing_validity.error))
|
|
|
|
ok()
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/p2p-interface.md#voluntary_exit
|
|
proc validateVoluntaryExit*(
|
|
pool: ExitPool, 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 err((ValidationResult.Reject, 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/v1.1.10/specs/altair/p2p-interface.md#sync_committee_subnet_id
|
|
proc validateSyncCommitteeMessage*(
|
|
dag: ChainDAGRef,
|
|
batchCrypto: ref BatchCrypto,
|
|
syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
|
|
msg: SyncCommitteeMessage,
|
|
subcommitteeIdx: SyncSubcommitteeIndex,
|
|
wallTime: BeaconTime,
|
|
checkSignature: bool):
|
|
Future[Result[(seq[uint64], CookedSig), ValidationError]] {.async.} =
|
|
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_propagation_slot_range(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 errReject(
|
|
"SyncCommitteeMessage: originator not part of sync committee")
|
|
|
|
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):
|
|
return errIgnore("SyncCommitteeMessage: duplicate message")
|
|
|
|
# [REJECT] The signature is valid for the message beacon_block_root for the
|
|
# validator referenced by validator_index.
|
|
let
|
|
epoch = msg.slot.epoch
|
|
fork = dag.forkAtEpoch(epoch)
|
|
genesisValidatorsRoot = dag.genesisValidatorsRoot
|
|
senderPubKey = dag.validatorKey(msg.validator_index)
|
|
|
|
if senderPubKey.isNone():
|
|
return errReject("SyncCommitteeMessage: invalid validator index")
|
|
|
|
let sig =
|
|
if checkSignature:
|
|
# Attestation signatures are batch-verified
|
|
let deferredCrypto = batchCrypto
|
|
.scheduleSyncCommitteeMessageCheck(
|
|
fork, genesis_validators_root,
|
|
msg.slot, msg.beacon_block_root,
|
|
senderPubKey.get(), msg.signature)
|
|
if deferredCrypto.isErr():
|
|
return errReject(deferredCrypto.error)
|
|
|
|
# Await the crypto check
|
|
let
|
|
(cryptoFut, sig) = deferredCrypto.get()
|
|
|
|
var x = (await cryptoFut)
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return errReject("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:
|
|
let sig = msg.signature.load()
|
|
if not sig.isSome():
|
|
return errReject("SyncCommitteeMessage: unable to load signature")
|
|
sig.get()
|
|
|
|
return ok((positionsInSubcommittee, sig))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/altair/p2p-interface.md#sync_committee_contribution_and_proof
|
|
proc validateContribution*(
|
|
dag: ChainDAGRef,
|
|
batchCrypto: ref BatchCrypto,
|
|
syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
|
|
msg: SignedContributionAndProof,
|
|
wallTime: BeaconTime,
|
|
checkSignature: bool):
|
|
Future[Result[(CookedSig, seq[ValidatorIndex]), ValidationError]] {.async.} =
|
|
let
|
|
syncCommitteeSlot = msg.message.contribution.slot
|
|
|
|
# [IGNORE] The contribution's slot is for the current slot
|
|
# (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance)
|
|
# i.e. contribution.slot == current_slot.
|
|
block:
|
|
let v = check_propagation_slot_range(syncCommitteeSlot, wallTime) # [IGNORE]
|
|
if v.isErr():
|
|
return err(v.error())
|
|
|
|
# [REJECT] The subcommittee index is in the allowed range
|
|
# i.e. contribution.subcommittee_index < SYNC_COMMITTEE_SUBNET_COUNT.
|
|
let subcommitteeIdx = block:
|
|
let v = SyncSubcommitteeIndex.init(msg.message.contribution.subcommittee_index)
|
|
if v.isErr():
|
|
return errReject("SignedContributionAndProof: subcommittee index too high")
|
|
v.get()
|
|
|
|
# [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 errReject("SignedContributionAndProof: 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("SignedContributionAndProof: duplicate contribution")
|
|
|
|
# [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
|
|
epoch = msg.message.contribution.slot.epoch
|
|
fork = dag.forkAtEpoch(epoch)
|
|
genesis_validators_root = dag.genesisValidatorsRoot
|
|
|
|
if msg.message.contribution.aggregation_bits.countOnes() == 0:
|
|
# [REJECT] The contribution has participants
|
|
# that is, any(contribution.aggregation_bits).
|
|
return errReject("SignedContributionAndProof: aggregation bits empty")
|
|
|
|
# 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
|
|
let participants = dag.syncCommitteeParticipants(
|
|
msg.message.contribution.slot, subcommitteeIdx)
|
|
|
|
let sig = if checkSignature:
|
|
let deferredCrypto = batchCrypto.scheduleContributionChecks(
|
|
fork, genesis_validators_root, msg, subcommitteeIdx, dag)
|
|
if deferredCrypto.isErr():
|
|
return errReject(deferredCrypto.error)
|
|
|
|
let
|
|
(aggregatorFut, proofFut, contributionFut, sig) = deferredCrypto.get()
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature, signed_contribution_and_proof.signature, is valid
|
|
var x = await aggregatorFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return errReject("SignedContributionAndProof: invalid aggregator signature")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore("SignedContributionAndProof: timeout checking aggregator signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
var x = await proofFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return errReject("SignedContributionAndProof: invalid proof")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore("SignedContributionAndProof: timeout checking proof")
|
|
of BatchResult.Valid:
|
|
discard
|
|
|
|
block:
|
|
# [REJECT] The aggregator signature, signed_aggregate_and_proof.signature, is valid.
|
|
var x = await contributionFut
|
|
case x
|
|
of BatchResult.Invalid:
|
|
return errReject("SignedContributionAndProof: invalid contribution signature")
|
|
of BatchResult.Timeout:
|
|
beacon_contributions_dropped_queue_full.inc()
|
|
return errIgnore("SignedContributionAndProof: timeout checking contribution signature")
|
|
of BatchResult.Valid:
|
|
discard
|
|
sig
|
|
else:
|
|
let sig = msg.message.contribution.signature.load()
|
|
if not sig.isSome():
|
|
return errReject("SyncCommitteeMessage: unable to load signature")
|
|
sig.get()
|
|
|
|
return ok((sig, participants))
|
|
|
|
# https://github.com/ethereum/consensus-specs/blob/vFuture/specs/altair/sync-protocol.md#optimistic_light_client_update
|
|
proc validateOptimisticLightClientUpdate*(
|
|
dag: ChainDAGRef, optimistic_update: OptimisticLightClientUpdate):
|
|
Result[void, ValidationError] =
|
|
template local_update(): auto = dag.lightClientCache.optimisticUpdate
|
|
|
|
if optimistic_update != local_update:
|
|
# [IGNORE] The optimistic update is not attesting to the latest block's
|
|
# parent block.
|
|
if optimistic_update.attested_header != local_update.attested_header:
|
|
return errIgnore("OptimisticLightClientUpdate: not attesting to latest")
|
|
|
|
# [REJECT] The optimistic update does not match the expected value.
|
|
return errReject("OptimisticLightClientUpdate: not matching expected value")
|
|
|
|
ok()
|