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evidence.go
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evidence.go
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package types
import (
"bytes"
"fmt"
"strings"
"time"
"github.com/pkg/errors"
amino "github.com/tendermint/go-amino"
"github.com/tendermint/tendermint/crypto"
cryptoenc "github.com/tendermint/tendermint/crypto/encoding"
"github.com/tendermint/tendermint/crypto/merkle"
"github.com/tendermint/tendermint/crypto/tmhash"
tmproto "github.com/tendermint/tendermint/proto/types"
)
const (
// MaxEvidenceBytes is a maximum size of any evidence (including amino overhead).
MaxEvidenceBytes int64 = 484
)
// ErrEvidenceInvalid wraps a piece of evidence and the error denoting how or why it is invalid.
type ErrEvidenceInvalid struct {
Evidence Evidence
ErrorValue error
}
// NewErrEvidenceInvalid returns a new EvidenceInvalid with the given err.
func NewErrEvidenceInvalid(ev Evidence, err error) *ErrEvidenceInvalid {
return &ErrEvidenceInvalid{ev, err}
}
// Error returns a string representation of the error.
func (err *ErrEvidenceInvalid) Error() string {
return fmt.Sprintf("Invalid evidence: %v. Evidence: %v", err.ErrorValue, err.Evidence)
}
// ErrEvidenceOverflow is for when there is too much evidence in a block.
type ErrEvidenceOverflow struct {
MaxNum int64
GotNum int64
}
// NewErrEvidenceOverflow returns a new ErrEvidenceOverflow where got > max.
func NewErrEvidenceOverflow(max, got int64) *ErrEvidenceOverflow {
return &ErrEvidenceOverflow{max, got}
}
// Error returns a string representation of the error.
func (err *ErrEvidenceOverflow) Error() string {
return fmt.Sprintf("Too much evidence: Max %d, got %d", err.MaxNum, err.GotNum)
}
//-------------------------------------------
// Evidence represents any provable malicious activity by a validator
type Evidence interface {
Height() int64 // height of the equivocation
Time() time.Time // time of the equivocation
Address() []byte // address of the equivocating validator
Bytes() []byte // bytes which comprise the evidence
Hash() []byte // hash of the evidence
Verify(chainID string, pubKey crypto.PubKey) error // verify the evidence
Equal(Evidence) bool // check equality of evidence
ValidateBasic() error
String() string
}
func EvidenceToProto(evidence Evidence) (*tmproto.Evidence, error) {
if evidence == nil {
return nil, errors.New("nil evidence")
}
switch evi := evidence.(type) {
case *DuplicateVoteEvidence:
voteB := evi.VoteB.ToProto()
voteA := evi.VoteA.ToProto()
pk, err := cryptoenc.PubKeyToProto(evi.PubKey)
if err != nil {
return nil, err
}
tp := &tmproto.Evidence{
Sum: &tmproto.Evidence_DuplicateVoteEvidence{
DuplicateVoteEvidence: &tmproto.DuplicateVoteEvidence{
PubKey: &pk,
VoteA: voteA,
VoteB: voteB,
},
},
}
return tp, nil
case MockEvidence:
if err := evi.ValidateBasic(); err != nil {
return nil, err
}
tp := &tmproto.Evidence{
Sum: &tmproto.Evidence_MockEvidence{
MockEvidence: &tmproto.MockEvidence{
EvidenceHeight: evi.Height(),
EvidenceTime: evi.Time(),
EvidenceAddress: evi.Address(),
},
},
}
return tp, nil
case MockRandomEvidence:
if err := evi.ValidateBasic(); err != nil {
return nil, err
}
tp := &tmproto.Evidence{
Sum: &tmproto.Evidence_MockRandomEvidence{
MockRandomEvidence: &tmproto.MockRandomEvidence{
EvidenceHeight: evi.Height(),
EvidenceTime: evi.Time(),
EvidenceAddress: evi.Address(),
RandBytes: evi.randBytes,
},
},
}
return tp, nil
default:
return nil, fmt.Errorf("toproto: evidence is not recognized: %T", evi)
}
}
func EvidenceFromProto(evidence *tmproto.Evidence) (Evidence, error) {
if evidence == nil {
return nil, errors.New("nil evidence")
}
switch evi := evidence.Sum.(type) {
case *tmproto.Evidence_DuplicateVoteEvidence:
vA, err := VoteFromProto(evi.DuplicateVoteEvidence.VoteA)
if err != nil {
return nil, err
}
vB, err := VoteFromProto(evi.DuplicateVoteEvidence.VoteB)
if err != nil {
return nil, err
}
pk, err := cryptoenc.PubKeyFromProto(evi.DuplicateVoteEvidence.GetPubKey())
if err != nil {
return nil, err
}
dve := DuplicateVoteEvidence{
PubKey: pk,
VoteA: vA,
VoteB: vB,
}
return &dve, dve.ValidateBasic()
case *tmproto.Evidence_MockEvidence:
me := MockEvidence{
EvidenceHeight: evi.MockEvidence.GetEvidenceHeight(),
EvidenceAddress: evi.MockEvidence.GetEvidenceAddress(),
EvidenceTime: evi.MockEvidence.GetEvidenceTime(),
}
return me, me.ValidateBasic()
case *tmproto.Evidence_MockRandomEvidence:
mre := MockRandomEvidence{
MockEvidence: MockEvidence{
EvidenceHeight: evi.MockRandomEvidence.GetEvidenceHeight(),
EvidenceAddress: evi.MockRandomEvidence.GetEvidenceAddress(),
EvidenceTime: evi.MockRandomEvidence.GetEvidenceTime(),
},
randBytes: evi.MockRandomEvidence.RandBytes,
}
return mre, mre.ValidateBasic()
default:
return nil, errors.New("evidence is not recognized")
}
}
func RegisterEvidences(cdc *amino.Codec) {
cdc.RegisterInterface((*Evidence)(nil), nil)
cdc.RegisterConcrete(&DuplicateVoteEvidence{}, "tendermint/DuplicateVoteEvidence", nil)
}
func RegisterMockEvidences(cdc *amino.Codec) {
cdc.RegisterConcrete(MockEvidence{}, "tendermint/MockEvidence", nil)
cdc.RegisterConcrete(MockRandomEvidence{}, "tendermint/MockRandomEvidence", nil)
}
const (
MaxEvidenceBytesDenominator = 10
)
// MaxEvidencePerBlock returns the maximum number of evidences
// allowed in the block and their maximum total size (limitted to 1/10th
// of the maximum block size).
// TODO: change to a constant, or to a fraction of the validator set size.
// See https://github.com/tendermint/tendermint/issues/2590
func MaxEvidencePerBlock(blockMaxBytes int64) (int64, int64) {
maxBytes := blockMaxBytes / MaxEvidenceBytesDenominator
maxNum := maxBytes / MaxEvidenceBytes
return maxNum, maxBytes
}
//-------------------------------------------
// DuplicateVoteEvidence contains evidence a validator signed two conflicting
// votes.
type DuplicateVoteEvidence struct {
PubKey crypto.PubKey
VoteA *Vote
VoteB *Vote
}
var _ Evidence = &DuplicateVoteEvidence{}
// NewDuplicateVoteEvidence creates DuplicateVoteEvidence with right ordering given
// two conflicting votes. If one of the votes is nil, evidence returned is nil as well
func NewDuplicateVoteEvidence(pubkey crypto.PubKey, vote1 *Vote, vote2 *Vote) *DuplicateVoteEvidence {
var voteA, voteB *Vote
if vote1 == nil || vote2 == nil {
return nil
}
if strings.Compare(vote1.BlockID.Key(), vote2.BlockID.Key()) == -1 {
voteA = vote1
voteB = vote2
} else {
voteA = vote2
voteB = vote1
}
return &DuplicateVoteEvidence{
PubKey: pubkey,
VoteA: voteA,
VoteB: voteB,
}
}
// String returns a string representation of the evidence.
func (dve *DuplicateVoteEvidence) String() string {
return fmt.Sprintf("VoteA: %v; VoteB: %v", dve.VoteA, dve.VoteB)
}
// Height returns the height this evidence refers to.
func (dve *DuplicateVoteEvidence) Height() int64 {
return dve.VoteA.Height
}
// Time return the time the evidence was created
func (dve *DuplicateVoteEvidence) Time() time.Time {
return dve.VoteA.Timestamp
}
// Address returns the address of the validator.
func (dve *DuplicateVoteEvidence) Address() []byte {
return dve.PubKey.Address()
}
// Hash returns the hash of the evidence.
func (dve *DuplicateVoteEvidence) Bytes() []byte {
return cdcEncode(dve)
}
// Hash returns the hash of the evidence.
func (dve *DuplicateVoteEvidence) Hash() []byte {
return tmhash.Sum(cdcEncode(dve))
}
// Verify returns an error if the two votes aren't conflicting.
// To be conflicting, they must be from the same validator, for the same H/R/S, but for different blocks.
func (dve *DuplicateVoteEvidence) Verify(chainID string, pubKey crypto.PubKey) error {
// H/R/S must be the same
if dve.VoteA.Height != dve.VoteB.Height ||
dve.VoteA.Round != dve.VoteB.Round ||
dve.VoteA.Type != dve.VoteB.Type {
return fmt.Errorf("duplicateVoteEvidence Error: H/R/S does not match. Got %v and %v", dve.VoteA, dve.VoteB)
}
// Address must be the same
if !bytes.Equal(dve.VoteA.ValidatorAddress, dve.VoteB.ValidatorAddress) {
return fmt.Errorf(
"duplicateVoteEvidence Error: Validator addresses do not match. Got %X and %X",
dve.VoteA.ValidatorAddress,
dve.VoteB.ValidatorAddress,
)
}
// Index must be the same
if dve.VoteA.ValidatorIndex != dve.VoteB.ValidatorIndex {
return fmt.Errorf(
"duplicateVoteEvidence Error: Validator indices do not match. Got %d and %d",
dve.VoteA.ValidatorIndex,
dve.VoteB.ValidatorIndex,
)
}
// BlockIDs must be different
if dve.VoteA.BlockID.Equals(dve.VoteB.BlockID) {
return fmt.Errorf(
"duplicateVoteEvidence Error: BlockIDs are the same (%v) - not a real duplicate vote",
dve.VoteA.BlockID,
)
}
// pubkey must match address (this should already be true, sanity check)
addr := dve.VoteA.ValidatorAddress
if !bytes.Equal(pubKey.Address(), addr) {
return fmt.Errorf("duplicateVoteEvidence FAILED SANITY CHECK - address (%X) doesn't match pubkey (%v - %X)",
addr, pubKey, pubKey.Address())
}
// Signatures must be valid
if !pubKey.VerifyBytes(dve.VoteA.SignBytes(chainID), dve.VoteA.Signature) {
return fmt.Errorf("duplicateVoteEvidence Error verifying VoteA: %v", ErrVoteInvalidSignature)
}
if !pubKey.VerifyBytes(dve.VoteB.SignBytes(chainID), dve.VoteB.Signature) {
return fmt.Errorf("duplicateVoteEvidence Error verifying VoteB: %v", ErrVoteInvalidSignature)
}
return nil
}
// Equal checks if two pieces of evidence are equal.
func (dve *DuplicateVoteEvidence) Equal(ev Evidence) bool {
if _, ok := ev.(*DuplicateVoteEvidence); !ok {
return false
}
// just check their hashes
dveHash := tmhash.Sum(cdcEncode(dve))
evHash := tmhash.Sum(cdcEncode(ev))
fmt.Println(dveHash, evHash)
return bytes.Equal(dveHash, evHash)
}
// ValidateBasic performs basic validation.
func (dve *DuplicateVoteEvidence) ValidateBasic() error {
if len(dve.PubKey.Bytes()) == 0 {
return errors.New("empty PubKey")
}
if dve.VoteA == nil || dve.VoteB == nil {
return fmt.Errorf("one or both of the votes are empty %v, %v", dve.VoteA, dve.VoteB)
}
if err := dve.VoteA.ValidateBasic(); err != nil {
return fmt.Errorf("invalid VoteA: %v", err)
}
if err := dve.VoteB.ValidateBasic(); err != nil {
return fmt.Errorf("invalid VoteB: %v", err)
}
// Enforce Votes are lexicographically sorted on blockID
if strings.Compare(dve.VoteA.BlockID.Key(), dve.VoteB.BlockID.Key()) >= 0 {
return errors.New("duplicate votes in invalid order")
}
return nil
}
//-----------------------------------------------------------------
// UNSTABLE
type MockRandomEvidence struct {
MockEvidence
randBytes []byte
}
var _ Evidence = &MockRandomEvidence{}
// UNSTABLE
func NewMockRandomEvidence(height int64, eTime time.Time, address []byte, randBytes []byte) MockRandomEvidence {
return MockRandomEvidence{
MockEvidence{
EvidenceHeight: height,
EvidenceTime: eTime,
EvidenceAddress: address}, randBytes,
}
}
func (e MockRandomEvidence) Hash() []byte {
return []byte(fmt.Sprintf("%d-%x", e.EvidenceHeight, e.randBytes))
}
// UNSTABLE
type MockEvidence struct {
EvidenceHeight int64
EvidenceTime time.Time
EvidenceAddress []byte
}
var _ Evidence = &MockEvidence{}
// UNSTABLE
func NewMockEvidence(height int64, eTime time.Time, idx int, address []byte) MockEvidence {
return MockEvidence{
EvidenceHeight: height,
EvidenceTime: eTime,
EvidenceAddress: address}
}
func (e MockEvidence) Height() int64 { return e.EvidenceHeight }
func (e MockEvidence) Time() time.Time { return e.EvidenceTime }
func (e MockEvidence) Address() []byte { return e.EvidenceAddress }
func (e MockEvidence) Hash() []byte {
return []byte(fmt.Sprintf("%d-%x-%s",
e.EvidenceHeight, e.EvidenceAddress, e.EvidenceTime))
}
func (e MockEvidence) Bytes() []byte {
return []byte(fmt.Sprintf("%d-%x-%s",
e.EvidenceHeight, e.EvidenceAddress, e.EvidenceTime))
}
func (e MockEvidence) Verify(chainID string, pubKey crypto.PubKey) error { return nil }
func (e MockEvidence) Equal(ev Evidence) bool {
e2 := ev.(MockEvidence)
return e.EvidenceHeight == e2.EvidenceHeight &&
bytes.Equal(e.EvidenceAddress, e2.EvidenceAddress)
}
func (e MockEvidence) ValidateBasic() error { return nil }
func (e MockEvidence) String() string {
return fmt.Sprintf("Evidence: %d/%s/%s", e.EvidenceHeight, e.Time(), e.EvidenceAddress)
}
//-------------------------------------------
// EvidenceList is a list of Evidence. Evidences is not a word.
type EvidenceList []Evidence
// Hash returns the simple merkle root hash of the EvidenceList.
func (evl EvidenceList) Hash() []byte {
// These allocations are required because Evidence is not of type Bytes, and
// golang slices can't be typed cast. This shouldn't be a performance problem since
// the Evidence size is capped.
evidenceBzs := make([][]byte, len(evl))
for i := 0; i < len(evl); i++ {
evidenceBzs[i] = evl[i].Bytes()
}
return merkle.SimpleHashFromByteSlices(evidenceBzs)
}
func (evl EvidenceList) String() string {
s := ""
for _, e := range evl {
s += fmt.Sprintf("%s\t\t", e)
}
return s
}
// Has returns true if the evidence is in the EvidenceList.
func (evl EvidenceList) Has(evidence Evidence) bool {
for _, ev := range evl {
if ev.Equal(evidence) {
return true
}
}
return false
}