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