486 lines
18 KiB
Nim
486 lines
18 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2021 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 https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://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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import
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std/tables,
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stew/results,
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chronicles, chronos, metrics,
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../spec/[helpers, forks],
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../spec/datatypes/[altair, phase0],
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../consensus_object_pools/[
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block_clearance, blockchain_dag, exit_pool, attestation_pool,
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sync_committee_msg_pool],
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../validators/validator_pool,
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../beacon_clock,
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"."/[gossip_validation, block_processor, batch_validation]
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export
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results, block_clearance, blockchain_dag, exit_pool, attestation_pool,
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sync_committee_msg_pool, validator_pool, beacon_clock, gossip_validation,
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block_processor, batch_validation
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# Metrics for tracking attestation and beacon block loss
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declareCounter beacon_attestations_received,
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"Number of valid unaggregated attestations processed by this node"
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declareCounter beacon_attestations_dropped,
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"Number of invalid unaggregated attestations dropped by this node", labels = ["reason"]
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declareCounter beacon_aggregates_received,
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"Number of valid aggregated attestations processed by this node"
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declareCounter beacon_aggregates_dropped,
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"Number of invalid aggregated attestations dropped by this node", labels = ["reason"]
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declareCounter beacon_blocks_received,
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"Number of valid blocks processed by this node"
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declareCounter beacon_blocks_dropped,
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"Number of invalid blocks dropped by this node", labels = ["reason"]
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declareCounter beacon_attester_slashings_received,
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"Number of valid attester slashings processed by this node"
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declareCounter beacon_attester_slashings_dropped,
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"Number of invalid attester slashings dropped by this node", labels = ["reason"]
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declareCounter beacon_proposer_slashings_received,
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"Number of valid proposer slashings processed by this node"
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declareCounter beacon_proposer_slashings_dropped,
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"Number of invalid proposer slashings dropped by this node", labels = ["reason"]
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declareCounter beacon_voluntary_exits_received,
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"Number of valid voluntary exits processed by this node"
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declareCounter beacon_voluntary_exits_dropped,
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"Number of invalid voluntary exits dropped by this node", labels = ["reason"]
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declareCounter beacon_sync_committee_messages_received,
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"Number of valid sync committee messages processed by this node"
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declareCounter beacon_sync_committee_messages_dropped,
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"Number of invalid sync committee messages dropped by this node", labels = ["reason"]
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declareCounter beacon_sync_committee_contributions_received,
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"Number of valid sync committee contributions processed by this node"
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declareCounter beacon_sync_committee_contributions_dropped,
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"Number of invalid sync committee contributions dropped by this node", labels = ["reason"]
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const delayBuckets = [2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, Inf]
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declareHistogram beacon_attestation_delay,
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"Time(s) between slot start and attestation reception", buckets = delayBuckets
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declareHistogram beacon_aggregate_delay,
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"Time(s) between slot start and aggregate reception", buckets = delayBuckets
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declareHistogram beacon_block_delay,
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"Time(s) between slot start and beacon block reception", buckets = delayBuckets
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type
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DoppelgangerProtection = object
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broadcastStartEpoch*: Epoch ##\
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## Set anew, each time gossip is re-enabled after syncing completes, so
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## might reset multiple times per instance. This allows some safe level
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## of gossip interleaving between nodes so long as they don't gossip at
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## the same time.
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nodeLaunchSlot: Slot ##\
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## Set once, at node launch. This functions as a basic protection against
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## false positives from attestations persisting within the gossip network
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## across quick restarts.
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Eth2Processor* = object
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## The Eth2Processor is the entry point for untrusted message processing -
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## when we receive messages from various sources, we pass them to the
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## processor for validation and routing - the messages are generally
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## validated, and if valid, passed on to the various pools, monitors and
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## managers to update the state of the application.
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##
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## Block processing is special in that part of it is done in the
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## `BlockProcessor` instead, via a special block processing queue.
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##
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## Each validating function generally will do a sanity check on the message
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## whose purpose is to quickly filter out spam, then will (usually) delegate
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## full validation to the proper manager - finally, metrics and monitoring
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## are updated.
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doppelGangerDetectionEnabled*: bool
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# Local sources of truth for validation
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# ----------------------------------------------------------------
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dag*: ChainDAGRef
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attestationPool*: ref AttestationPool
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validatorPool: ref ValidatorPool
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syncCommitteeMsgPool: ref SyncCommitteeMsgPool
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doppelgangerDetection*: DoppelgangerProtection
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# Gossip validated -> enqueue for further verification
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# ----------------------------------------------------------------
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blockProcessor: ref BlockProcessor
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# Validated with no further verification required
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# ----------------------------------------------------------------
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exitPool: ref ExitPool
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# Almost validated, pending cryptographic signature check
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# ----------------------------------------------------------------
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batchCrypto*: ref BatchCrypto
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# Missing information
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# ----------------------------------------------------------------
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quarantine*: QuarantineRef
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# Application-provided current time provider (to facilitate testing)
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getCurrentBeaconTime*: GetBeaconTimeFn
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ValidationRes* = Result[void, ValidationError]
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# Initialization
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# ------------------------------------------------------------------------------
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proc new*(T: type Eth2Processor,
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doppelGangerDetectionEnabled: bool,
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blockProcessor: ref BlockProcessor,
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dag: ChainDAGRef,
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attestationPool: ref AttestationPool,
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exitPool: ref ExitPool,
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validatorPool: ref ValidatorPool,
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syncCommitteeMsgPool: ref SyncCommitteeMsgPool,
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quarantine: QuarantineRef,
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rng: ref BrHmacDrbgContext,
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getBeaconTime: GetBeaconTimeFn,
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taskpool: batch_validation.TaskPoolPtr
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): ref Eth2Processor =
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(ref Eth2Processor)(
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doppelGangerDetectionEnabled: doppelGangerDetectionEnabled,
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doppelgangerDetection: DoppelgangerProtection(
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nodeLaunchSlot: getBeaconTime().slotOrZero),
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blockProcessor: blockProcessor,
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dag: dag,
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attestationPool: attestationPool,
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exitPool: exitPool,
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validatorPool: validatorPool,
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syncCommitteeMsgPool: syncCommitteeMsgPool,
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quarantine: quarantine,
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getCurrentBeaconTime: getBeaconTime,
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batchCrypto: BatchCrypto.new(
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rng = rng,
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# Only run eager attestation signature verification if we're not
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# processing blocks in order to give priority to block processing
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eager = proc(): bool = not blockProcessor[].hasBlocks(),
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taskpool)
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)
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# Each validator logs, validates then passes valid data to its destination
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# further down the line - in particular, validation should generally not have
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# any side effects until the message is fully validated, or invalid messages
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# could be used to push out valid messages.
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proc blockValidator*(
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self: var Eth2Processor,
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signedBlock: phase0.SignedBeaconBlock | altair.SignedBeaconBlock): ValidationRes =
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let
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wallTime = self.getCurrentBeaconTime()
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(afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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blockRoot = shortLog(signedBlock.root)
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blck = shortLog(signedBlock.message)
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signature = shortLog(signedBlock.signature)
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wallSlot
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if not afterGenesis:
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notice "Block before genesis"
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return errIgnore("Block before genesis")
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - signedBlock.message.slot.toBeaconTime
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# Start of block processing - in reality, we have already gone through SSZ
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# decoding at this stage, which may be significant
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debug "Block received", delay
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let v =
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self.dag.validateBeaconBlock(self.quarantine, signedBlock, wallTime, {})
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if v.isOk():
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# Block passed validation - enqueue it for processing. The block processing
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# queue is effectively unbounded as we use a freestanding task to enqueue
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# the block - this is done so that when blocks arrive concurrently with
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# sync, we don't lose the gossip blocks, but also don't block the gossip
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# propagation of seemingly good blocks
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trace "Block validated"
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self.blockProcessor[].addBlock(
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ForkedSignedBeaconBlock.init(signedBlock),
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validationDur = self.getCurrentBeaconTime() - wallTime)
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# Validator monitor registration for blocks is done by the processor
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beacon_blocks_received.inc()
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beacon_block_delay.observe(delay.toFloatSeconds())
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else:
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debug "Dropping block", error = v.error()
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self.blockProcessor[].dumpInvalidBlock(signedBlock)
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beacon_blocks_dropped.inc(1, [$v.error[0]])
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v
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proc checkForPotentialDoppelganger(
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self: var Eth2Processor, attestation: Attestation,
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attesterIndices: openArray[ValidatorIndex]) =
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# Only check for attestations after node launch. There might be one slot of
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# overlap in quick intra-slot restarts so trade off a few true negatives in
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# the service of avoiding more likely false positives.
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if attestation.data.slot <= self.doppelgangerDetection.nodeLaunchSlot + 1:
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return
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if attestation.data.slot.epoch <
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self.doppelgangerDetection.broadcastStartEpoch:
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let tgtBlck = self.dag.getRef(attestation.data.target.root)
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doAssert not tgtBlck.isNil # because attestation is valid above
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let epochRef = self.dag.getEpochRef(
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tgtBlck, attestation.data.target.epoch)
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for validatorIndex in attesterIndices:
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let validatorPubkey = epochRef.validatorKey(validatorIndex).get().toPubKey()
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if self.doppelgangerDetectionEnabled and
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self.validatorPool[].getValidator(validatorPubkey) !=
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default(AttachedValidator):
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warn "We believe you are currently running another instance of the same validator. We've disconnected you from the network as this presents a significant slashing risk. Possible next steps are (a) making sure you've disconnected your validator from your old machine before restarting the client; and (b) running the client again with the gossip-slashing-protection option disabled, only if you are absolutely sure this is the only instance of your validator running, and reporting the issue at https://github.com/status-im/nimbus-eth2/issues.",
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validatorIndex,
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validatorPubkey,
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attestation = shortLog(attestation)
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quit QuitFailure
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proc attestationValidator*(
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self: ref Eth2Processor,
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attestation: Attestation,
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subnet_id: SubnetId,
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checkSignature: bool = true): Future[ValidationRes] {.async.} =
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let wallTime = self.getCurrentBeaconTime()
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var (afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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attestation = shortLog(attestation)
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subnet_id
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wallSlot
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if not afterGenesis:
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notice "Attestation before genesis"
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return errIgnore("Attestation before genesis")
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - attestation.data.slot.toBeaconTime
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debug "Attestation received", delay
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# Now proceed to validation
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let v =
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await self.attestationPool.validateAttestation(
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self.batchCrypto, attestation, wallTime, subnet_id, checkSignature)
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return if v.isOk():
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# Due to async validation the wallSlot here might have changed
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wallSlot = self.getCurrentBeaconTime().slotOrZero()
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let (attester_index, sig) = v.get()
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self[].checkForPotentialDoppelganger(attestation, [attester_index])
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trace "Attestation validated"
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self.attestationPool[].addAttestation(
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attestation, [attester_index], sig, wallSlot)
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beacon_attestations_received.inc()
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beacon_attestation_delay.observe(delay.toFloatSeconds())
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ok()
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else:
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debug "Dropping attestation", validationError = v.error
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beacon_attestations_dropped.inc(1, [$v.error[0]])
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err(v.error())
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proc aggregateValidator*(
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self: ref Eth2Processor,
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signedAggregateAndProof: SignedAggregateAndProof): Future[ValidationRes] {.async.} =
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let wallTime = self.getCurrentBeaconTime()
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var (afterGenesis, wallSlot) = wallTime.toSlot()
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logScope:
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aggregate = shortLog(signedAggregateAndProof.message.aggregate)
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aggregator_index = signedAggregateAndProof.message.aggregator_index
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selection_proof = shortLog(signedAggregateAndProof.message.selection_proof)
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signature = shortLog(signedAggregateAndProof.signature)
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wallSlot
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if not afterGenesis:
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notice "Aggregate before genesis"
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return errIgnore("Aggreagte before genesis")
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# Potential under/overflows are fine; would just create odd logs
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let delay =
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wallTime - signedAggregateAndProof.message.aggregate.data.slot.toBeaconTime
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debug "Aggregate received", delay
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let v =
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await self.attestationPool.validateAggregate(
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self.batchCrypto, signedAggregateAndProof, wallTime)
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return if v.isOk():
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# Due to async validation the wallSlot here might have changed
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wallSlot = self.getCurrentBeaconTime().slotOrZero()
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let (attesting_indices, sig) = v.get()
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self[].checkForPotentialDoppelganger(
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signedAggregateAndProof.message.aggregate, attesting_indices)
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trace "Aggregate validated"
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self.attestationPool[].addAttestation(
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signedAggregateAndProof.message.aggregate, attesting_indices, sig, wallSlot)
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beacon_aggregates_received.inc()
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beacon_aggregate_delay.observe(delay.toFloatSeconds())
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ok()
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else:
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debug "Dropping aggregate", error = v.error
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beacon_aggregates_dropped.inc(1, [$v.error[0]])
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err(v.error())
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proc attesterSlashingValidator*(
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self: var Eth2Processor, attesterSlashing: AttesterSlashing):
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ValidationRes =
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logScope:
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attesterSlashing = shortLog(attesterSlashing)
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debug "Attester slashing received"
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let v = self.exitPool[].validateAttesterSlashing(attesterSlashing)
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if v.isOk():
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trace "Attester slashing validated"
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self.exitPool[].addMessage(attesterSlashing)
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beacon_attester_slashings_received.inc()
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else:
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debug "Dropping attester slashing", validationError = v.error
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beacon_attester_slashings_dropped.inc(1, [$v.error[0]])
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v
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proc proposerSlashingValidator*(
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self: var Eth2Processor, proposerSlashing: ProposerSlashing):
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Result[void, ValidationError] =
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logScope:
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proposerSlashing = shortLog(proposerSlashing)
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debug "Proposer slashing received"
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let v = self.exitPool[].validateProposerSlashing(proposerSlashing)
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if v.isOk():
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trace "Proposer slashing validated"
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beacon_proposer_slashings_received.inc()
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else:
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debug "Dropping proposer slashing", validationError = v.error
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self.exitPool[].addMessage(proposerSlashing)
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beacon_proposer_slashings_dropped.inc(1, [$v.error[0]])
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v
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proc voluntaryExitValidator*(
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self: var Eth2Processor, signedVoluntaryExit: SignedVoluntaryExit):
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Result[void, ValidationError] =
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logScope:
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signedVoluntaryExit = shortLog(signedVoluntaryExit)
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debug "Voluntary exit received"
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let v = self.exitPool[].validateVoluntaryExit(signedVoluntaryExit)
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if v.isOk():
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trace "Voluntary exit validated"
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self.exitPool[].addMessage(signedVoluntaryExit)
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beacon_voluntary_exits_received.inc()
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else:
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debug "Dropping voluntary exit", error = v.error
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beacon_voluntary_exits_dropped.inc(1, [$v.error[0]])
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v
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proc syncCommitteeMessageValidator*(
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self: ref Eth2Processor,
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syncCommitteeMsg: SyncCommitteeMessage,
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subcommitteeIdx: SyncSubcommitteeIndex,
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checkSignature: bool = true): Result[void, ValidationError] =
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let
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wallTime = self.getCurrentBeaconTime()
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wallSlot = wallTime.slotOrZero()
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logScope:
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syncCommitteeMsg = shortLog(syncCommitteeMsg)
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subcommitteeIdx
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wallSlot
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - syncCommitteeMsg.slot.toBeaconTime
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debug "Sync committee message received", delay
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# Now proceed to validation
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let v = validateSyncCommitteeMessage(self.dag, self.syncCommitteeMsgPool[],
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syncCommitteeMsg, subcommitteeIdx,
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wallTime, checkSignature)
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return if v.isOk():
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trace "Sync committee message validated"
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let (positions, cookedSig) = v.get()
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self.syncCommitteeMsgPool[].addSyncCommitteeMessage(
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syncCommitteeMsg.slot,
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syncCommitteeMsg.beacon_block_root,
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syncCommitteeMsg.validator_index,
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cookedSig,
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subcommitteeIdx,
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positions)
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beacon_sync_committee_messages_received.inc()
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ok()
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else:
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debug "Dropping sync committee message", error = v.error
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beacon_sync_committee_messages_dropped.inc(1, [$v.error[0]])
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err(v.error())
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proc contributionValidator*(
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self: ref Eth2Processor,
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contributionAndProof: SignedContributionAndProof,
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checkSignature: bool = true): Result[void, ValidationError] =
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let
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wallTime = self.getCurrentBeaconTime()
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wallSlot = wallTime.slotOrZero()
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logScope:
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contribution = shortLog(contributionAndProof.message.contribution)
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signature = shortLog(contributionAndProof.signature)
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aggregator_index = contributionAndProof.message.aggregator_index
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selection_proof = contributionAndProof.message.selection_proof
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wallSlot
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# Potential under/overflows are fine; would just create odd metrics and logs
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let delay = wallTime - contributionAndProof.message.contribution.slot.toBeaconTime
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debug "Contribution received", delay
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# Now proceed to validation
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let v = validateContribution(
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self.dag, self.syncCommitteeMsgPool[], contributionAndProof, wallTime,
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checkSignature)
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return if v.isOk():
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trace "Contribution validated"
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self.syncCommitteeMsgPool[].addContribution(contributionAndProof, v.get)
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beacon_sync_committee_contributions_received.inc()
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ok()
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else:
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debug "Dropping contribution", error = v.error
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beacon_sync_committee_contributions_dropped.inc(1, [$v.error[0]])
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err(v.error())
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