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Check seeds (#4901)

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This commit is contained in:
terence tsao
2020-02-18 10:05:36 -08:00
committed by GitHub
parent 0e37b4926a
commit c0d4cabdb7
1 changed files with 23 additions and 0 deletions
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23
beacon-chain/blockchain/process_attestation_helpers.go
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@@ -2,6 +2,7 @@ package blockchain
import (
"context"
"encoding/hex"
"fmt"
"github.com/pkg/errors"
@@ -95,6 +96,28 @@ func (s *Service) verifyAttestation(ctx context.Context, baseState *stateTrie.Be
}
if err := blocks.VerifyIndexedAttestation(ctx, baseState, indexedAtt); err != nil {
if err == blocks.ErrSigFailedToVerify {
// When sig fails to verify, check if there's a differences in committees due to
// different seeds.
aState, err := s.beaconDB.State(ctx, bytesutil.ToBytes32(a.Data.BeaconBlockRoot))
if err != nil {
return nil, err
}
epoch := helpers.SlotToEpoch(a.Data.Slot)
origSeed, err := helpers.Seed(baseState, epoch, params.BeaconConfig().DomainBeaconAttester)
if err != nil {
return nil, errors.Wrap(err, "could not get original seed")
}
aSeed, err := helpers.Seed(aState, epoch, params.BeaconConfig().DomainBeaconAttester)
if err != nil {
return nil, errors.Wrap(err, "could not get attester's seed")
}
if origSeed != aSeed {
return nil, fmt.Errorf("could not verify indexed attestation due to differences in seeds: %v != %v",
hex.EncodeToString(bytesutil.Trunc(origSeed[:])), hex.EncodeToString(bytesutil.Trunc(aSeed[:])))
}
}
return nil, errors.Wrap(err, "could not verify indexed attestation")
}