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