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474 lines
19 KiB
474 lines
19 KiB
package evidence_test
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import (
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/crypto/tmhash"
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"github.com/tendermint/tendermint/evidence"
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"github.com/tendermint/tendermint/evidence/mocks"
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"github.com/tendermint/tendermint/libs/log"
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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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sm "github.com/tendermint/tendermint/state"
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smmocks "github.com/tendermint/tendermint/state/mocks"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/version"
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)
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func TestVerifyLightClientAttack_Lunatic(t *testing.T) {
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commonVals, commonPrivVals := types.RandValidatorSet(2, 10)
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newVal, newPrivVal := types.RandValidator(false, 9)
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conflictingVals, err := types.ValidatorSetFromExistingValidators(append(commonVals.Validators, newVal))
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require.NoError(t, err)
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conflictingPrivVals := append(commonPrivVals, newPrivVal)
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commonHeader := makeHeaderRandom(4)
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commonHeader.Time = defaultEvidenceTime
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trustedHeader := makeHeaderRandom(10)
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trustedHeader.Time = defaultEvidenceTime.Add(1 * time.Hour)
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conflictingHeader := makeHeaderRandom(10)
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conflictingHeader.Time = defaultEvidenceTime.Add(1 * time.Hour)
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conflictingHeader.ValidatorsHash = conflictingVals.Hash()
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// we are simulating a lunatic light client attack
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blockID := makeBlockID(conflictingHeader.Hash(), 1000, []byte("partshash"))
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voteSet := types.NewVoteSet(evidenceChainID, 10, 1, tmproto.SignedMsgType(2), conflictingVals)
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commit, err := types.MakeCommit(blockID, 10, 1, voteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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ev := &types.LightClientAttackEvidence{
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ConflictingBlock: &types.LightBlock{
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SignedHeader: &types.SignedHeader{
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Header: conflictingHeader,
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Commit: commit,
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},
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ValidatorSet: conflictingVals,
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},
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CommonHeight: 4,
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TotalVotingPower: 20,
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ByzantineValidators: commonVals.Validators,
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Timestamp: defaultEvidenceTime,
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}
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commonSignedHeader := &types.SignedHeader{
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Header: commonHeader,
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Commit: &types.Commit{},
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}
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trustedBlockID := makeBlockID(trustedHeader.Hash(), 1000, []byte("partshash"))
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vals, privVals := types.RandValidatorSet(3, 8)
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trustedVoteSet := types.NewVoteSet(evidenceChainID, 10, 1, tmproto.SignedMsgType(2), vals)
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trustedCommit, err := types.MakeCommit(trustedBlockID, 10, 1, trustedVoteSet, privVals, defaultEvidenceTime)
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require.NoError(t, err)
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trustedSignedHeader := &types.SignedHeader{
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Header: trustedHeader,
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Commit: trustedCommit,
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}
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// good pass -> no error
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err = evidence.VerifyLightClientAttack(ev, commonSignedHeader, trustedSignedHeader, commonVals,
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defaultEvidenceTime.Add(2*time.Hour), 3*time.Hour)
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assert.NoError(t, err)
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// trusted and conflicting hashes are the same -> an error should be returned
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err = evidence.VerifyLightClientAttack(ev, commonSignedHeader, ev.ConflictingBlock.SignedHeader, commonVals,
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defaultEvidenceTime.Add(2*time.Hour), 3*time.Hour)
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assert.Error(t, err)
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// evidence with different total validator power should fail
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ev.TotalVotingPower = 1
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err = evidence.VerifyLightClientAttack(ev, commonSignedHeader, trustedSignedHeader, commonVals,
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defaultEvidenceTime.Add(2*time.Hour), 3*time.Hour)
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assert.Error(t, err)
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ev.TotalVotingPower = 20
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forwardConflictingHeader := makeHeaderRandom(11)
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forwardConflictingHeader.Time = defaultEvidenceTime.Add(30 * time.Minute)
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forwardConflictingHeader.ValidatorsHash = conflictingVals.Hash()
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forwardBlockID := makeBlockID(forwardConflictingHeader.Hash(), 1000, []byte("partshash"))
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forwardVoteSet := types.NewVoteSet(evidenceChainID, 11, 1, tmproto.SignedMsgType(2), conflictingVals)
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forwardCommit, err := types.MakeCommit(forwardBlockID, 11, 1, forwardVoteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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forwardLunaticEv := &types.LightClientAttackEvidence{
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ConflictingBlock: &types.LightBlock{
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SignedHeader: &types.SignedHeader{
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Header: forwardConflictingHeader,
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Commit: forwardCommit,
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},
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ValidatorSet: conflictingVals,
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},
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CommonHeight: 4,
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TotalVotingPower: 20,
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ByzantineValidators: commonVals.Validators,
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Timestamp: defaultEvidenceTime,
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}
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err = evidence.VerifyLightClientAttack(forwardLunaticEv, commonSignedHeader, trustedSignedHeader, commonVals,
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defaultEvidenceTime.Add(2*time.Hour), 3*time.Hour)
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assert.NoError(t, err)
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state := sm.State{
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LastBlockTime: defaultEvidenceTime.Add(2 * time.Hour),
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LastBlockHeight: 11,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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stateStore := &smmocks.Store{}
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stateStore.On("LoadValidators", int64(4)).Return(commonVals, nil)
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stateStore.On("Load").Return(state, nil)
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blockStore := &mocks.BlockStore{}
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blockStore.On("LoadBlockMeta", int64(4)).Return(&types.BlockMeta{Header: *commonHeader})
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blockStore.On("LoadBlockMeta", int64(10)).Return(&types.BlockMeta{Header: *trustedHeader})
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blockStore.On("LoadBlockMeta", int64(11)).Return(nil)
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blockStore.On("LoadBlockCommit", int64(4)).Return(commit)
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blockStore.On("LoadBlockCommit", int64(10)).Return(trustedCommit)
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blockStore.On("Height").Return(int64(10))
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pool, err := evidence.NewPool(log.TestingLogger(), dbm.NewMemDB(), stateStore, blockStore)
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require.NoError(t, err)
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evList := types.EvidenceList{ev}
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err = pool.CheckEvidence(evList)
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assert.NoError(t, err)
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pendingEvs, _ := pool.PendingEvidence(state.ConsensusParams.Evidence.MaxBytes)
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assert.Equal(t, 1, len(pendingEvs))
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// if we submit evidence only against a single byzantine validator when we see there are more validators then this
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// should return an error
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ev.ByzantineValidators = []*types.Validator{commonVals.Validators[0]}
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err = pool.CheckEvidence(evList)
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assert.Error(t, err)
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ev.ByzantineValidators = commonVals.Validators // restore evidence
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// If evidence is submitted with an altered timestamp it should return an error
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ev.Timestamp = defaultEvidenceTime.Add(1 * time.Minute)
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err = pool.CheckEvidence(evList)
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assert.Error(t, err)
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evList = types.EvidenceList{forwardLunaticEv}
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err = pool.CheckEvidence(evList)
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assert.NoError(t, err)
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}
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func TestVerifyLightClientAttack_Equivocation(t *testing.T) {
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conflictingVals, conflictingPrivVals := types.RandValidatorSet(5, 10)
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trustedHeader := makeHeaderRandom(10)
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conflictingHeader := makeHeaderRandom(10)
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conflictingHeader.ValidatorsHash = conflictingVals.Hash()
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trustedHeader.ValidatorsHash = conflictingHeader.ValidatorsHash
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trustedHeader.NextValidatorsHash = conflictingHeader.NextValidatorsHash
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trustedHeader.ConsensusHash = conflictingHeader.ConsensusHash
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trustedHeader.AppHash = conflictingHeader.AppHash
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trustedHeader.LastResultsHash = conflictingHeader.LastResultsHash
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// we are simulating a duplicate vote attack where all the validators in the conflictingVals set
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// except the last validator vote twice
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blockID := makeBlockID(conflictingHeader.Hash(), 1000, []byte("partshash"))
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voteSet := types.NewVoteSet(evidenceChainID, 10, 1, tmproto.SignedMsgType(2), conflictingVals)
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commit, err := types.MakeCommit(blockID, 10, 1, voteSet, conflictingPrivVals[:4], defaultEvidenceTime)
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require.NoError(t, err)
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ev := &types.LightClientAttackEvidence{
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ConflictingBlock: &types.LightBlock{
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SignedHeader: &types.SignedHeader{
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Header: conflictingHeader,
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Commit: commit,
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},
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ValidatorSet: conflictingVals,
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},
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CommonHeight: 10,
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ByzantineValidators: conflictingVals.Validators[:4],
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TotalVotingPower: 50,
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Timestamp: defaultEvidenceTime,
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}
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trustedBlockID := makeBlockID(trustedHeader.Hash(), 1000, []byte("partshash"))
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trustedVoteSet := types.NewVoteSet(evidenceChainID, 10, 1, tmproto.SignedMsgType(2), conflictingVals)
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trustedCommit, err := types.MakeCommit(trustedBlockID, 10, 1, trustedVoteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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trustedSignedHeader := &types.SignedHeader{
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Header: trustedHeader,
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Commit: trustedCommit,
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}
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// good pass -> no error
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err = evidence.VerifyLightClientAttack(ev, trustedSignedHeader, trustedSignedHeader, conflictingVals,
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defaultEvidenceTime.Add(1*time.Minute), 2*time.Hour)
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assert.NoError(t, err)
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// trusted and conflicting hashes are the same -> an error should be returned
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err = evidence.VerifyLightClientAttack(ev, trustedSignedHeader, ev.ConflictingBlock.SignedHeader, conflictingVals,
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defaultEvidenceTime.Add(1*time.Minute), 2*time.Hour)
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assert.Error(t, err)
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// conflicting header has different next validators hash which should have been correctly derived from
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// the previous round
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ev.ConflictingBlock.Header.NextValidatorsHash = crypto.CRandBytes(tmhash.Size)
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err = evidence.VerifyLightClientAttack(ev, trustedSignedHeader, trustedSignedHeader, nil,
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defaultEvidenceTime.Add(1*time.Minute), 2*time.Hour)
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assert.Error(t, err)
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// revert next validators hash
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ev.ConflictingBlock.Header.NextValidatorsHash = trustedHeader.NextValidatorsHash
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state := sm.State{
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LastBlockTime: defaultEvidenceTime.Add(1 * time.Minute),
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LastBlockHeight: 11,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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stateStore := &smmocks.Store{}
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stateStore.On("LoadValidators", int64(10)).Return(conflictingVals, nil)
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stateStore.On("Load").Return(state, nil)
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blockStore := &mocks.BlockStore{}
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blockStore.On("LoadBlockMeta", int64(10)).Return(&types.BlockMeta{Header: *trustedHeader})
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blockStore.On("LoadBlockCommit", int64(10)).Return(trustedCommit)
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pool, err := evidence.NewPool(log.TestingLogger(), dbm.NewMemDB(), stateStore, blockStore)
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require.NoError(t, err)
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evList := types.EvidenceList{ev}
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err = pool.CheckEvidence(evList)
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assert.NoError(t, err)
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pendingEvs, _ := pool.PendingEvidence(state.ConsensusParams.Evidence.MaxBytes)
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assert.Equal(t, 1, len(pendingEvs))
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}
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func TestVerifyLightClientAttack_Amnesia(t *testing.T) {
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conflictingVals, conflictingPrivVals := types.RandValidatorSet(5, 10)
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conflictingHeader := makeHeaderRandom(10)
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conflictingHeader.ValidatorsHash = conflictingVals.Hash()
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trustedHeader := makeHeaderRandom(10)
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trustedHeader.ValidatorsHash = conflictingHeader.ValidatorsHash
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trustedHeader.NextValidatorsHash = conflictingHeader.NextValidatorsHash
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trustedHeader.AppHash = conflictingHeader.AppHash
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trustedHeader.ConsensusHash = conflictingHeader.ConsensusHash
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trustedHeader.LastResultsHash = conflictingHeader.LastResultsHash
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// we are simulating an amnesia attack where all the validators in the conflictingVals set
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// except the last validator vote twice. However this time the commits are of different rounds.
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blockID := makeBlockID(conflictingHeader.Hash(), 1000, []byte("partshash"))
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voteSet := types.NewVoteSet(evidenceChainID, 10, 0, tmproto.SignedMsgType(2), conflictingVals)
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commit, err := types.MakeCommit(blockID, 10, 0, voteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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ev := &types.LightClientAttackEvidence{
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ConflictingBlock: &types.LightBlock{
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SignedHeader: &types.SignedHeader{
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Header: conflictingHeader,
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Commit: commit,
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},
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ValidatorSet: conflictingVals,
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},
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CommonHeight: 10,
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ByzantineValidators: nil, // with amnesia evidence no validators are submitted as abci evidence
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TotalVotingPower: 50,
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Timestamp: defaultEvidenceTime,
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}
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trustedBlockID := makeBlockID(trustedHeader.Hash(), 1000, []byte("partshash"))
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trustedVoteSet := types.NewVoteSet(evidenceChainID, 10, 1, tmproto.SignedMsgType(2), conflictingVals)
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trustedCommit, err := types.MakeCommit(trustedBlockID, 10, 1, trustedVoteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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trustedSignedHeader := &types.SignedHeader{
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Header: trustedHeader,
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Commit: trustedCommit,
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}
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// good pass -> no error
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err = evidence.VerifyLightClientAttack(ev, trustedSignedHeader, trustedSignedHeader, conflictingVals,
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defaultEvidenceTime.Add(1*time.Minute), 2*time.Hour)
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assert.NoError(t, err)
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// trusted and conflicting hashes are the same -> an error should be returned
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err = evidence.VerifyLightClientAttack(ev, trustedSignedHeader, ev.ConflictingBlock.SignedHeader, conflictingVals,
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defaultEvidenceTime.Add(1*time.Minute), 2*time.Hour)
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assert.Error(t, err)
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state := sm.State{
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LastBlockTime: defaultEvidenceTime.Add(1 * time.Minute),
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LastBlockHeight: 11,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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stateStore := &smmocks.Store{}
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stateStore.On("LoadValidators", int64(10)).Return(conflictingVals, nil)
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stateStore.On("Load").Return(state, nil)
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blockStore := &mocks.BlockStore{}
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blockStore.On("LoadBlockMeta", int64(10)).Return(&types.BlockMeta{Header: *trustedHeader})
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blockStore.On("LoadBlockCommit", int64(10)).Return(trustedCommit)
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pool, err := evidence.NewPool(log.TestingLogger(), dbm.NewMemDB(), stateStore, blockStore)
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require.NoError(t, err)
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evList := types.EvidenceList{ev}
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err = pool.CheckEvidence(evList)
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assert.NoError(t, err)
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pendingEvs, _ := pool.PendingEvidence(state.ConsensusParams.Evidence.MaxBytes)
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assert.Equal(t, 1, len(pendingEvs))
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}
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type voteData struct {
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vote1 *types.Vote
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vote2 *types.Vote
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valid bool
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}
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func TestVerifyDuplicateVoteEvidence(t *testing.T) {
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val := types.NewMockPV()
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val2 := types.NewMockPV()
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valSet := types.NewValidatorSet([]*types.Validator{val.ExtractIntoValidator(1)})
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blockID := makeBlockID([]byte("blockhash"), 1000, []byte("partshash"))
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blockID2 := makeBlockID([]byte("blockhash2"), 1000, []byte("partshash"))
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blockID3 := makeBlockID([]byte("blockhash"), 10000, []byte("partshash"))
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blockID4 := makeBlockID([]byte("blockhash"), 10000, []byte("partshash2"))
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const chainID = "mychain"
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vote1 := makeVote(t, val, chainID, 0, 10, 2, 1, blockID, defaultEvidenceTime)
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v1 := vote1.ToProto()
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err := val.SignVote(context.Background(), chainID, v1)
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require.NoError(t, err)
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badVote := makeVote(t, val, chainID, 0, 10, 2, 1, blockID, defaultEvidenceTime)
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bv := badVote.ToProto()
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err = val2.SignVote(context.Background(), chainID, bv)
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require.NoError(t, err)
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vote1.Signature = v1.Signature
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badVote.Signature = bv.Signature
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cases := []voteData{
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 1, blockID2, defaultEvidenceTime), true}, // different block ids
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 1, blockID3, defaultEvidenceTime), true},
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 1, blockID4, defaultEvidenceTime), true},
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 1, blockID, defaultEvidenceTime), false}, // wrong block id
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{vote1, makeVote(t, val, "mychain2", 0, 10, 2, 1, blockID2, defaultEvidenceTime), false}, // wrong chain id
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{vote1, makeVote(t, val, chainID, 0, 11, 2, 1, blockID2, defaultEvidenceTime), false}, // wrong height
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{vote1, makeVote(t, val, chainID, 0, 10, 3, 1, blockID2, defaultEvidenceTime), false}, // wrong round
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 2, blockID2, defaultEvidenceTime), false}, // wrong step
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{vote1, makeVote(t, val2, chainID, 0, 10, 2, 1, blockID2, defaultEvidenceTime), false}, // wrong validator
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// a different vote time doesn't matter
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{vote1, makeVote(t, val, chainID, 0, 10, 2, 1, blockID2, time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC)), true},
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{vote1, badVote, false}, // signed by wrong key
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}
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require.NoError(t, err)
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for _, c := range cases {
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ev := &types.DuplicateVoteEvidence{
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VoteA: c.vote1,
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VoteB: c.vote2,
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ValidatorPower: 1,
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TotalVotingPower: 1,
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Timestamp: defaultEvidenceTime,
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}
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if c.valid {
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assert.Nil(t, evidence.VerifyDuplicateVote(ev, chainID, valSet), "evidence should be valid")
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} else {
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assert.NotNil(t, evidence.VerifyDuplicateVote(ev, chainID, valSet), "evidence should be invalid")
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}
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}
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// create good evidence and correct validator power
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goodEv := types.NewMockDuplicateVoteEvidenceWithValidator(10, defaultEvidenceTime, val, chainID)
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goodEv.ValidatorPower = 1
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goodEv.TotalVotingPower = 1
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badEv := types.NewMockDuplicateVoteEvidenceWithValidator(10, defaultEvidenceTime, val, chainID)
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badTimeEv := types.NewMockDuplicateVoteEvidenceWithValidator(10, defaultEvidenceTime.Add(1*time.Minute), val, chainID)
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badTimeEv.ValidatorPower = 1
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badTimeEv.TotalVotingPower = 1
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state := sm.State{
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ChainID: chainID,
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LastBlockTime: defaultEvidenceTime.Add(1 * time.Minute),
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LastBlockHeight: 11,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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stateStore := &smmocks.Store{}
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stateStore.On("LoadValidators", int64(10)).Return(valSet, nil)
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stateStore.On("Load").Return(state, nil)
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blockStore := &mocks.BlockStore{}
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blockStore.On("LoadBlockMeta", int64(10)).Return(&types.BlockMeta{Header: types.Header{Time: defaultEvidenceTime}})
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pool, err := evidence.NewPool(log.TestingLogger(), dbm.NewMemDB(), stateStore, blockStore)
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require.NoError(t, err)
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evList := types.EvidenceList{goodEv}
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err = pool.CheckEvidence(evList)
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assert.NoError(t, err)
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// evidence with a different validator power should fail
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evList = types.EvidenceList{badEv}
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err = pool.CheckEvidence(evList)
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assert.Error(t, err)
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|
|
|
// evidence with a different timestamp should fail
|
|
evList = types.EvidenceList{badTimeEv}
|
|
err = pool.CheckEvidence(evList)
|
|
assert.Error(t, err)
|
|
}
|
|
|
|
func makeVote(
|
|
t *testing.T, val types.PrivValidator, chainID string, valIndex int32, height int64,
|
|
round int32, step int, blockID types.BlockID, time time.Time) *types.Vote {
|
|
pubKey, err := val.GetPubKey(context.Background())
|
|
require.NoError(t, err)
|
|
v := &types.Vote{
|
|
ValidatorAddress: pubKey.Address(),
|
|
ValidatorIndex: valIndex,
|
|
Height: height,
|
|
Round: round,
|
|
Type: tmproto.SignedMsgType(step),
|
|
BlockID: blockID,
|
|
Timestamp: time,
|
|
}
|
|
|
|
vpb := v.ToProto()
|
|
err = val.SignVote(context.Background(), chainID, vpb)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
v.Signature = vpb.Signature
|
|
return v
|
|
}
|
|
|
|
func makeHeaderRandom(height int64) *types.Header {
|
|
return &types.Header{
|
|
Version: version.Consensus{Block: version.BlockProtocol, App: 1},
|
|
ChainID: evidenceChainID,
|
|
Height: height,
|
|
Time: defaultEvidenceTime,
|
|
LastBlockID: makeBlockID([]byte("headerhash"), 1000, []byte("partshash")),
|
|
LastCommitHash: crypto.CRandBytes(tmhash.Size),
|
|
DataHash: crypto.CRandBytes(tmhash.Size),
|
|
ValidatorsHash: crypto.CRandBytes(tmhash.Size),
|
|
NextValidatorsHash: crypto.CRandBytes(tmhash.Size),
|
|
ConsensusHash: crypto.CRandBytes(tmhash.Size),
|
|
AppHash: crypto.CRandBytes(tmhash.Size),
|
|
LastResultsHash: crypto.CRandBytes(tmhash.Size),
|
|
EvidenceHash: crypto.CRandBytes(tmhash.Size),
|
|
ProposerAddress: crypto.CRandBytes(crypto.AddressSize),
|
|
}
|
|
}
|
|
|
|
func makeBlockID(hash []byte, partSetSize uint32, partSetHash []byte) types.BlockID {
|
|
var (
|
|
h = make([]byte, tmhash.Size)
|
|
psH = make([]byte, tmhash.Size)
|
|
)
|
|
copy(h, hash)
|
|
copy(psH, partSetHash)
|
|
return types.BlockID{
|
|
Hash: h,
|
|
PartSetHeader: types.PartSetHeader{
|
|
Total: partSetSize,
|
|
Hash: psH,
|
|
},
|
|
}
|
|
}
|