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217 lines
6.7 KiB
217 lines
6.7 KiB
package types
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import (
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"bytes"
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"fmt"
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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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// 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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func NewEvidenceInvalidErr(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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//-------------------------------------------
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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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Address() []byte // address of the equivocating validator
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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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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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// mocks
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cdc.RegisterConcrete(MockGoodEvidence{}, "tendermint/MockGoodEvidence", nil)
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cdc.RegisterConcrete(MockBadEvidence{}, "tendermint/MockBadEvidence", nil)
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}
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//-------------------------------------------
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// DuplicateVoteEvidence contains evidence a validator signed two conflicting 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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// 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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// 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) Hash() []byte {
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return aminoHasher(dve).Hash()
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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("DuplicateVoteEvidence Error: Validator addresses do not match. Got %X and %X", dve.VoteA.ValidatorAddress, dve.VoteB.ValidatorAddress)
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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("DuplicateVoteEvidence Error: Validator indices do not match. Got %d and %d", dve.VoteA.ValidatorIndex, dve.VoteB.ValidatorIndex)
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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("DuplicateVoteEvidence Error: BlockIDs are the same (%v) - not a real duplicate vote", dve.VoteA.BlockID)
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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 := aminoHasher(dve).Hash()
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evHash := aminoHasher(ev).Hash()
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return bytes.Equal(dveHash, evHash)
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}
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//-----------------------------------------------------------------
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// UNSTABLE
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type MockGoodEvidence struct {
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Height_ int64
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Address_ []byte
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}
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// UNSTABLE
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func NewMockGoodEvidence(height int64, idx int, address []byte) MockGoodEvidence {
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return MockGoodEvidence{height, address}
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}
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func (e MockGoodEvidence) Height() int64 { return e.Height_ }
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func (e MockGoodEvidence) Address() []byte { return e.Address_ }
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func (e MockGoodEvidence) Hash() []byte {
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return []byte(fmt.Sprintf("%d-%x", e.Height_, e.Address_))
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}
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func (e MockGoodEvidence) Verify(chainID string, pubKey crypto.PubKey) error { return nil }
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func (e MockGoodEvidence) Equal(ev Evidence) bool {
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e2 := ev.(MockGoodEvidence)
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return e.Height_ == e2.Height_ &&
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bytes.Equal(e.Address_, e2.Address_)
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}
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func (e MockGoodEvidence) String() string {
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return fmt.Sprintf("GoodEvidence: %d/%s", e.Height_, e.Address_)
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}
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// UNSTABLE
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type MockBadEvidence struct {
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MockGoodEvidence
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}
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func (e MockBadEvidence) Verify(chainID string, pubKey crypto.PubKey) error {
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return fmt.Errorf("MockBadEvidence")
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}
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func (e MockBadEvidence) Equal(ev Evidence) bool {
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e2 := ev.(MockBadEvidence)
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return e.Height_ == e2.Height_ &&
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bytes.Equal(e.Address_, e2.Address_)
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}
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func (e MockBadEvidence) String() string {
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return fmt.Sprintf("BadEvidence: %d/%s", e.Height_, e.Address_)
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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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// Recursive impl.
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// Copied from crypto/merkle to avoid allocations
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switch len(evl) {
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case 0:
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return nil
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case 1:
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return evl[0].Hash()
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default:
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left := EvidenceList(evl[:(len(evl)+1)/2]).Hash()
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right := EvidenceList(evl[(len(evl)+1)/2:]).Hash()
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return merkle.SimpleHashFromTwoHashes(left, right)
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}
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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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