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343 lines
10 KiB
343 lines
10 KiB
package privval
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import (
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"bytes"
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"errors"
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"fmt"
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"io/ioutil"
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"sync"
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"time"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/crypto/ed25519"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/types"
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tmtime "github.com/tendermint/tendermint/types/time"
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)
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// TODO: type ?
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const (
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stepNone int8 = 0 // Used to distinguish the initial state
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stepPropose int8 = 1
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stepPrevote int8 = 2
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stepPrecommit int8 = 3
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)
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func voteToStep(vote *types.Vote) int8 {
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switch vote.Type {
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case types.PrevoteType:
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return stepPrevote
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case types.PrecommitType:
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return stepPrecommit
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default:
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cmn.PanicSanity("Unknown vote type")
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return 0
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}
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}
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// FilePV implements PrivValidator using data persisted to disk
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// to prevent double signing.
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// NOTE: the directory containing the pv.filePath must already exist.
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// It includes the LastSignature and LastSignBytes so we don't lose the signature
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// if the process crashes after signing but before the resulting consensus message is processed.
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type FilePV struct {
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Address types.Address `json:"address"`
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PubKey crypto.PubKey `json:"pub_key"`
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LastHeight int64 `json:"last_height"`
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LastRound int `json:"last_round"`
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LastStep int8 `json:"last_step"`
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LastSignature []byte `json:"last_signature,omitempty"`
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LastSignBytes cmn.HexBytes `json:"last_signbytes,omitempty"`
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PrivKey crypto.PrivKey `json:"priv_key"`
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// For persistence.
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// Overloaded for testing.
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filePath string
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mtx sync.Mutex
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}
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// GetAddress returns the address of the validator.
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// Implements PrivValidator.
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func (pv *FilePV) GetAddress() types.Address {
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return pv.Address
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}
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// GetPubKey returns the public key of the validator.
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// Implements PrivValidator.
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func (pv *FilePV) GetPubKey() crypto.PubKey {
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return pv.PubKey
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}
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// GenFilePV generates a new validator with randomly generated private key
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// and sets the filePath, but does not call Save().
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func GenFilePV(filePath string) *FilePV {
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privKey := ed25519.GenPrivKey()
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return &FilePV{
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Address: privKey.PubKey().Address(),
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PubKey: privKey.PubKey(),
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PrivKey: privKey,
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LastStep: stepNone,
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filePath: filePath,
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}
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}
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// LoadFilePV loads a FilePV from the filePath. The FilePV handles double
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// signing prevention by persisting data to the filePath. If the filePath does
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// not exist, the FilePV must be created manually and saved.
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func LoadFilePV(filePath string) *FilePV {
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pvJSONBytes, err := ioutil.ReadFile(filePath)
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if err != nil {
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cmn.Exit(err.Error())
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}
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pv := &FilePV{}
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err = cdc.UnmarshalJSON(pvJSONBytes, &pv)
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if err != nil {
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cmn.Exit(fmt.Sprintf("Error reading PrivValidator from %v: %v\n", filePath, err))
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}
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// overwrite pubkey and address for convenience
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pv.PubKey = pv.PrivKey.PubKey()
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pv.Address = pv.PubKey.Address()
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pv.filePath = filePath
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return pv
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}
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// LoadOrGenFilePV loads a FilePV from the given filePath
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// or else generates a new one and saves it to the filePath.
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func LoadOrGenFilePV(filePath string) *FilePV {
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var pv *FilePV
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if cmn.FileExists(filePath) {
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pv = LoadFilePV(filePath)
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} else {
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pv = GenFilePV(filePath)
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pv.Save()
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}
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return pv
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}
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// Save persists the FilePV to disk.
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func (pv *FilePV) Save() {
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pv.mtx.Lock()
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defer pv.mtx.Unlock()
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pv.save()
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}
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func (pv *FilePV) save() {
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outFile := pv.filePath
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if outFile == "" {
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panic("Cannot save PrivValidator: filePath not set")
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}
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jsonBytes, err := cdc.MarshalJSONIndent(pv, "", " ")
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if err != nil {
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panic(err)
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}
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err = cmn.WriteFileAtomic(outFile, jsonBytes, 0600)
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if err != nil {
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panic(err)
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}
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}
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// Reset resets all fields in the FilePV.
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// NOTE: Unsafe!
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func (pv *FilePV) Reset() {
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var sig []byte
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pv.LastHeight = 0
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pv.LastRound = 0
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pv.LastStep = 0
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pv.LastSignature = sig
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pv.LastSignBytes = nil
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pv.Save()
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}
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// SignVote signs a canonical representation of the vote, along with the
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// chainID. Implements PrivValidator.
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func (pv *FilePV) SignVote(chainID string, vote *types.Vote) error {
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pv.mtx.Lock()
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defer pv.mtx.Unlock()
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if err := pv.signVote(chainID, vote); err != nil {
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return fmt.Errorf("Error signing vote: %v", err)
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}
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return nil
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}
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// SignProposal signs a canonical representation of the proposal, along with
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// the chainID. Implements PrivValidator.
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func (pv *FilePV) SignProposal(chainID string, proposal *types.Proposal) error {
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pv.mtx.Lock()
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defer pv.mtx.Unlock()
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if err := pv.signProposal(chainID, proposal); err != nil {
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return fmt.Errorf("Error signing proposal: %v", err)
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}
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return nil
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}
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// returns error if HRS regression or no LastSignBytes. returns true if HRS is unchanged
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func (pv *FilePV) checkHRS(height int64, round int, step int8) (bool, error) {
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if pv.LastHeight > height {
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return false, errors.New("Height regression")
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}
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if pv.LastHeight == height {
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if pv.LastRound > round {
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return false, errors.New("Round regression")
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}
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if pv.LastRound == round {
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if pv.LastStep > step {
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return false, errors.New("Step regression")
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} else if pv.LastStep == step {
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if pv.LastSignBytes != nil {
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if pv.LastSignature == nil {
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panic("pv: LastSignature is nil but LastSignBytes is not!")
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}
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return true, nil
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}
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return false, errors.New("No LastSignature found")
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}
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}
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}
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return false, nil
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}
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// signVote checks if the vote is good to sign and sets the vote signature.
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// It may need to set the timestamp as well if the vote is otherwise the same as
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// a previously signed vote (ie. we crashed after signing but before the vote hit the WAL).
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func (pv *FilePV) signVote(chainID string, vote *types.Vote) error {
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height, round, step := vote.Height, vote.Round, voteToStep(vote)
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signBytes := vote.SignBytes(chainID)
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sameHRS, err := pv.checkHRS(height, round, step)
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if err != nil {
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return err
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}
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// We might crash before writing to the wal,
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// causing us to try to re-sign for the same HRS.
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// If signbytes are the same, use the last signature.
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// If they only differ by timestamp, use last timestamp and signature
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// Otherwise, return error
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if sameHRS {
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if bytes.Equal(signBytes, pv.LastSignBytes) {
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vote.Signature = pv.LastSignature
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} else if timestamp, ok := checkVotesOnlyDifferByTimestamp(pv.LastSignBytes, signBytes); ok {
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vote.Timestamp = timestamp
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vote.Signature = pv.LastSignature
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} else {
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err = fmt.Errorf("Conflicting data")
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}
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return err
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}
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// It passed the checks. Sign the vote
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sig, err := pv.PrivKey.Sign(signBytes)
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if err != nil {
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return err
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}
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pv.saveSigned(height, round, step, signBytes, sig)
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vote.Signature = sig
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return nil
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}
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// signProposal checks if the proposal is good to sign and sets the proposal signature.
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// It may need to set the timestamp as well if the proposal is otherwise the same as
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// a previously signed proposal ie. we crashed after signing but before the proposal hit the WAL).
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func (pv *FilePV) signProposal(chainID string, proposal *types.Proposal) error {
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height, round, step := proposal.Height, proposal.Round, stepPropose
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signBytes := proposal.SignBytes(chainID)
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sameHRS, err := pv.checkHRS(height, round, step)
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if err != nil {
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return err
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}
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// We might crash before writing to the wal,
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// causing us to try to re-sign for the same HRS.
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// If signbytes are the same, use the last signature.
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// If they only differ by timestamp, use last timestamp and signature
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// Otherwise, return error
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if sameHRS {
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if bytes.Equal(signBytes, pv.LastSignBytes) {
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proposal.Signature = pv.LastSignature
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} else if timestamp, ok := checkProposalsOnlyDifferByTimestamp(pv.LastSignBytes, signBytes); ok {
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proposal.Timestamp = timestamp
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proposal.Signature = pv.LastSignature
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} else {
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err = fmt.Errorf("Conflicting data")
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}
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return err
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}
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// It passed the checks. Sign the proposal
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sig, err := pv.PrivKey.Sign(signBytes)
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if err != nil {
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return err
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}
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pv.saveSigned(height, round, step, signBytes, sig)
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proposal.Signature = sig
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return nil
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}
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// Persist height/round/step and signature
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func (pv *FilePV) saveSigned(height int64, round int, step int8,
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signBytes []byte, sig []byte) {
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pv.LastHeight = height
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pv.LastRound = round
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pv.LastStep = step
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pv.LastSignature = sig
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pv.LastSignBytes = signBytes
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pv.save()
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}
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// String returns a string representation of the FilePV.
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func (pv *FilePV) String() string {
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return fmt.Sprintf("PrivValidator{%v LH:%v, LR:%v, LS:%v}", pv.GetAddress(), pv.LastHeight, pv.LastRound, pv.LastStep)
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}
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//-------------------------------------
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// returns the timestamp from the lastSignBytes.
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// returns true if the only difference in the votes is their timestamp.
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func checkVotesOnlyDifferByTimestamp(lastSignBytes, newSignBytes []byte) (time.Time, bool) {
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var lastVote, newVote types.CanonicalVote
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if err := cdc.UnmarshalBinaryLengthPrefixed(lastSignBytes, &lastVote); err != nil {
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panic(fmt.Sprintf("LastSignBytes cannot be unmarshalled into vote: %v", err))
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}
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if err := cdc.UnmarshalBinaryLengthPrefixed(newSignBytes, &newVote); err != nil {
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panic(fmt.Sprintf("signBytes cannot be unmarshalled into vote: %v", err))
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}
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lastTime := lastVote.Timestamp
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// set the times to the same value and check equality
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now := tmtime.Now()
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lastVote.Timestamp = now
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newVote.Timestamp = now
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lastVoteBytes, _ := cdc.MarshalJSON(lastVote)
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newVoteBytes, _ := cdc.MarshalJSON(newVote)
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return lastTime, bytes.Equal(newVoteBytes, lastVoteBytes)
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}
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// returns the timestamp from the lastSignBytes.
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// returns true if the only difference in the proposals is their timestamp
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func checkProposalsOnlyDifferByTimestamp(lastSignBytes, newSignBytes []byte) (time.Time, bool) {
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var lastProposal, newProposal types.CanonicalProposal
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if err := cdc.UnmarshalBinaryLengthPrefixed(lastSignBytes, &lastProposal); err != nil {
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panic(fmt.Sprintf("LastSignBytes cannot be unmarshalled into proposal: %v", err))
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}
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if err := cdc.UnmarshalBinaryLengthPrefixed(newSignBytes, &newProposal); err != nil {
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panic(fmt.Sprintf("signBytes cannot be unmarshalled into proposal: %v", err))
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}
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lastTime := lastProposal.Timestamp
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// set the times to the same value and check equality
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now := tmtime.Now()
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lastProposal.Timestamp = now
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newProposal.Timestamp = now
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lastProposalBytes, _ := cdc.MarshalBinaryLengthPrefixed(lastProposal)
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newProposalBytes, _ := cdc.MarshalBinaryLengthPrefixed(newProposal)
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return lastTime, bytes.Equal(newProposalBytes, lastProposalBytes)
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}
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