mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
338 lines
12 KiB
Go
338 lines
12 KiB
Go
package sync
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import (
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"context"
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"fmt"
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"github.com/libp2p/go-libp2p-core/peer"
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pubsub "github.com/libp2p/go-libp2p-pubsub"
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"github.com/pkg/errors"
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types "github.com/prysmaticlabs/eth2-types"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/feed/operation"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/signing"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
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"github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/config/features"
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"github.com/prysmaticlabs/prysm/config/params"
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"github.com/prysmaticlabs/prysm/crypto/bls"
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"github.com/prysmaticlabs/prysm/encoding/bytesutil"
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"github.com/prysmaticlabs/prysm/monitoring/tracing"
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ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
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"github.com/prysmaticlabs/prysm/time/slots"
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"go.opencensus.io/trace"
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)
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// validateAggregateAndProof verifies the aggregated signature and the selection proof is valid before forwarding to the
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// network and downstream services.
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func (s *Service) validateAggregateAndProof(ctx context.Context, pid peer.ID, msg *pubsub.Message) (pubsub.ValidationResult, error) {
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if pid == s.cfg.p2p.PeerID() {
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return pubsub.ValidationAccept, nil
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}
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ctx, span := trace.StartSpan(ctx, "sync.validateAggregateAndProof")
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defer span.End()
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// To process the following it requires the recent blocks to be present in the database, so we'll skip
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// validating or processing aggregated attestations until fully synced.
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if s.cfg.initialSync.Syncing() {
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return pubsub.ValidationIgnore, nil
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}
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raw, err := s.decodePubsubMessage(msg)
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if err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationReject, err
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}
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m, ok := raw.(*ethpb.SignedAggregateAttestationAndProof)
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if !ok {
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return pubsub.ValidationReject, errors.Errorf("invalid message type: %T", raw)
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}
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if m.Message == nil {
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return pubsub.ValidationReject, errNilMessage
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}
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if err := helpers.ValidateNilAttestation(m.Message.Aggregate); err != nil {
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return pubsub.ValidationReject, err
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}
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// Do not process slot 0 aggregates.
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if m.Message.Aggregate.Data.Slot == 0 {
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return pubsub.ValidationIgnore, nil
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}
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// Broadcast the aggregated attestation on a feed to notify other services in the beacon node
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// of a received aggregated attestation.
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s.cfg.attestationNotifier.OperationFeed().Send(&feed.Event{
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Type: operation.AggregatedAttReceived,
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Data: &operation.AggregatedAttReceivedData{
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Attestation: m.Message,
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},
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})
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if err := helpers.ValidateSlotTargetEpoch(m.Message.Aggregate.Data); err != nil {
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return pubsub.ValidationReject, err
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}
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// Attestation's slot is within ATTESTATION_PROPAGATION_SLOT_RANGE and early attestation
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// processing tolerance.
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if err := helpers.ValidateAttestationTime(m.Message.Aggregate.Data.Slot, s.cfg.chain.GenesisTime(),
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earlyAttestationProcessingTolerance); err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationIgnore, err
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}
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// Verify this is the first aggregate received from the aggregator with index and slot.
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if s.hasSeenAggregatorIndexEpoch(m.Message.Aggregate.Data.Target.Epoch, m.Message.AggregatorIndex) {
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return pubsub.ValidationIgnore, nil
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}
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// Check that the block being voted on isn't invalid.
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if s.hasBadBlock(bytesutil.ToBytes32(m.Message.Aggregate.Data.BeaconBlockRoot)) ||
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s.hasBadBlock(bytesutil.ToBytes32(m.Message.Aggregate.Data.Target.Root)) ||
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s.hasBadBlock(bytesutil.ToBytes32(m.Message.Aggregate.Data.Source.Root)) {
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return pubsub.ValidationReject, errors.New("bad block referenced in attestation data")
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}
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// Verify aggregate attestation has not already been seen via aggregate gossip, within a block, or through the creation locally.
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seen, err := s.cfg.attPool.HasAggregatedAttestation(m.Message.Aggregate)
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if err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationIgnore, err
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}
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if seen {
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return pubsub.ValidationIgnore, nil
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}
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if !s.validateBlockInAttestation(ctx, m) {
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return pubsub.ValidationIgnore, nil
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}
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validationRes, err := s.validateAggregatedAtt(ctx, m)
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if validationRes != pubsub.ValidationAccept {
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return validationRes, err
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}
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s.setAggregatorIndexEpochSeen(m.Message.Aggregate.Data.Target.Epoch, m.Message.AggregatorIndex)
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msg.ValidatorData = m
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return pubsub.ValidationAccept, nil
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}
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func (s *Service) validateAggregatedAtt(ctx context.Context, signed *ethpb.SignedAggregateAttestationAndProof) (pubsub.ValidationResult, error) {
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ctx, span := trace.StartSpan(ctx, "sync.validateAggregatedAtt")
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defer span.End()
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// Verify attestation target root is consistent with the head root.
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// This verification is not in the spec, however we guard against it as it opens us up
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// to weird edge cases during verification. The attestation technically could be used to add value to a block,
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// but it's invalid in the spirit of the protocol. Here we choose safety over profit.
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if err := s.cfg.chain.VerifyLmdFfgConsistency(ctx, signed.Message.Aggregate); err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationReject, err
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}
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// Verify current finalized checkpoint is an ancestor of the block defined by the attestation's beacon block root.
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if err := s.cfg.chain.VerifyFinalizedConsistency(ctx, signed.Message.Aggregate.Data.BeaconBlockRoot); err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationReject, err
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}
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bs, err := s.cfg.chain.AttestationTargetState(ctx, signed.Message.Aggregate.Data.Target)
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if err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationIgnore, err
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}
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attSlot := signed.Message.Aggregate.Data.Slot
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// Only advance state if different epoch as the committee can only change on an epoch transition.
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if slots.ToEpoch(attSlot) > slots.ToEpoch(bs.Slot()) {
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startSlot, err := slots.EpochStart(slots.ToEpoch(attSlot))
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if err != nil {
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return pubsub.ValidationIgnore, err
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}
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bs, err = transition.ProcessSlots(ctx, bs, startSlot)
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if err != nil {
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tracing.AnnotateError(span, err)
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return pubsub.ValidationIgnore, err
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}
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}
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// Verify validator index is within the beacon committee.
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if err := validateIndexInCommittee(ctx, bs, signed.Message.Aggregate, signed.Message.AggregatorIndex); err != nil {
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wrappedErr := errors.Wrapf(err, "Could not validate index in committee")
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tracing.AnnotateError(span, wrappedErr)
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return pubsub.ValidationReject, wrappedErr
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}
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// Verify selection proof reflects to the right validator.
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selectionSigSet, err := validateSelectionIndex(ctx, bs, signed.Message.Aggregate.Data, signed.Message.AggregatorIndex, signed.Message.SelectionProof)
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if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not validate selection for validator %d", signed.Message.AggregatorIndex)
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tracing.AnnotateError(span, wrappedErr)
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return pubsub.ValidationReject, wrappedErr
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}
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// Verify selection signature, aggregator signature and attestation signature are valid.
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// We use batch verify here to save compute.
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aggregatorSigSet, err := aggSigSet(bs, signed)
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if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not get aggregator sig set %d", signed.Message.AggregatorIndex)
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tracing.AnnotateError(span, wrappedErr)
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return pubsub.ValidationIgnore, wrappedErr
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}
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attSigSet, err := blocks.AttestationSignatureBatch(ctx, bs, []*ethpb.Attestation{signed.Message.Aggregate})
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if err != nil {
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wrappedErr := errors.Wrapf(err, "Could not verify aggregator signature %d", signed.Message.AggregatorIndex)
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tracing.AnnotateError(span, wrappedErr)
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return pubsub.ValidationIgnore, wrappedErr
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}
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set := bls.NewSet()
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set.Join(selectionSigSet).Join(aggregatorSigSet).Join(attSigSet)
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if features.Get().EnableBatchVerification {
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return s.validateWithBatchVerifier(ctx, "aggregate", set)
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}
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valid, err := set.Verify()
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if err != nil {
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tracing.AnnotateError(span, errors.Errorf("Could not join signature set"))
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return pubsub.ValidationIgnore, err
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}
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if !valid {
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err = errors.Errorf("Could not verify selection or aggregator or attestation signature")
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tracing.AnnotateError(span, err)
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return pubsub.ValidationReject, err
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}
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return pubsub.ValidationAccept, nil
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}
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func (s *Service) validateBlockInAttestation(ctx context.Context, satt *ethpb.SignedAggregateAttestationAndProof) bool {
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a := satt.Message
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// Verify the block being voted and the processed state is in beaconDB. The block should have passed validation if it's in the beaconDB.
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blockRoot := bytesutil.ToBytes32(a.Aggregate.Data.BeaconBlockRoot)
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if !s.hasBlockAndState(ctx, blockRoot) {
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// A node doesn't have the block, it'll request from peer while saving the pending attestation to a queue.
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s.savePendingAtt(satt)
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return false
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}
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return true
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}
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// Returns true if the node has received aggregate for the aggregator with index and target epoch.
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func (s *Service) hasSeenAggregatorIndexEpoch(epoch types.Epoch, aggregatorIndex types.ValidatorIndex) bool {
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s.seenAggregatedAttestationLock.RLock()
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defer s.seenAggregatedAttestationLock.RUnlock()
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b := append(bytesutil.Bytes32(uint64(epoch)), bytesutil.Bytes32(uint64(aggregatorIndex))...)
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_, seen := s.seenAggregatedAttestationCache.Get(string(b))
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return seen
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}
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// Set aggregate's aggregator index target epoch as seen.
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func (s *Service) setAggregatorIndexEpochSeen(epoch types.Epoch, aggregatorIndex types.ValidatorIndex) {
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s.seenAggregatedAttestationLock.Lock()
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defer s.seenAggregatedAttestationLock.Unlock()
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b := append(bytesutil.Bytes32(uint64(epoch)), bytesutil.Bytes32(uint64(aggregatorIndex))...)
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s.seenAggregatedAttestationCache.Add(string(b), true)
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}
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// This validates the aggregator's index in state is within the beacon committee.
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func validateIndexInCommittee(ctx context.Context, bs state.ReadOnlyBeaconState, a *ethpb.Attestation, validatorIndex types.ValidatorIndex) error {
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ctx, span := trace.StartSpan(ctx, "sync.validateIndexInCommittee")
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defer span.End()
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committee, err := helpers.BeaconCommitteeFromState(ctx, bs, a.Data.Slot, a.Data.CommitteeIndex)
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if err != nil {
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return err
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}
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var withinCommittee bool
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for _, i := range committee {
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if validatorIndex == i {
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withinCommittee = true
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break
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}
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}
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if !withinCommittee {
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return fmt.Errorf("validator index %d is not within the committee: %v",
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validatorIndex, committee)
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}
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return nil
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}
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// This validates selection proof by validating it's from the correct validator index of the slot.
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// It does not verify the selection proof, it returns the signature set of selection proof which can be used for batch verify.
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func validateSelectionIndex(
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ctx context.Context,
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bs state.ReadOnlyBeaconState,
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data *ethpb.AttestationData,
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validatorIndex types.ValidatorIndex,
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proof []byte,
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) (*bls.SignatureBatch, error) {
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_, span := trace.StartSpan(ctx, "sync.validateSelectionIndex")
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defer span.End()
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committee, err := helpers.BeaconCommitteeFromState(ctx, bs, data.Slot, data.CommitteeIndex)
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if err != nil {
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return nil, err
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}
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aggregator, err := helpers.IsAggregator(uint64(len(committee)), proof)
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if err != nil {
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return nil, err
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}
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if !aggregator {
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return nil, fmt.Errorf("validator is not an aggregator for slot %d", data.Slot)
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}
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domain := params.BeaconConfig().DomainSelectionProof
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epoch := slots.ToEpoch(data.Slot)
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v, err := bs.ValidatorAtIndex(validatorIndex)
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if err != nil {
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return nil, err
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}
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publicKey, err := bls.PublicKeyFromBytes(v.PublicKey)
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if err != nil {
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return nil, err
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}
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d, err := signing.Domain(bs.Fork(), epoch, domain, bs.GenesisValidatorRoot())
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if err != nil {
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return nil, err
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}
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sszUint := types.SSZUint64(data.Slot)
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root, err := signing.ComputeSigningRoot(&sszUint, d)
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if err != nil {
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return nil, err
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}
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return &bls.SignatureBatch{
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Signatures: [][]byte{proof},
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PublicKeys: []bls.PublicKey{publicKey},
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Messages: [][32]byte{root},
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}, nil
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}
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// This returns aggregator signature set which can be used to batch verify.
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func aggSigSet(s state.ReadOnlyBeaconState, a *ethpb.SignedAggregateAttestationAndProof) (*bls.SignatureBatch, error) {
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v, err := s.ValidatorAtIndex(a.Message.AggregatorIndex)
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if err != nil {
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return nil, err
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}
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publicKey, err := bls.PublicKeyFromBytes(v.PublicKey)
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if err != nil {
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return nil, err
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}
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epoch := slots.ToEpoch(a.Message.Aggregate.Data.Slot)
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d, err := signing.Domain(s.Fork(), epoch, params.BeaconConfig().DomainAggregateAndProof, s.GenesisValidatorRoot())
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if err != nil {
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return nil, err
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}
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root, err := signing.ComputeSigningRoot(a.Message, d)
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if err != nil {
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return nil, err
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}
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return &bls.SignatureBatch{
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Signatures: [][]byte{a.Signature},
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PublicKeys: []bls.PublicKey{publicKey},
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Messages: [][32]byte{root},
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}, nil
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}
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