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194 lines
5.7 KiB
194 lines
5.7 KiB
package state
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import (
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"bytes"
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"errors"
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"fmt"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/types"
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dbm "github.com/tendermint/tm-db"
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)
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//-----------------------------------------------------
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// Validate block
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func validateBlock(evidencePool EvidencePool, stateDB dbm.DB, state State, block *types.Block) error {
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// Validate internal consistency.
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if err := block.ValidateBasic(); err != nil {
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return err
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}
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// Validate basic info.
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if block.Version != state.Version.Consensus {
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return fmt.Errorf("wrong Block.Header.Version. Expected %v, got %v",
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state.Version.Consensus,
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block.Version,
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)
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}
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if block.ChainID != state.ChainID {
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return fmt.Errorf("wrong Block.Header.ChainID. Expected %v, got %v",
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state.ChainID,
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block.ChainID,
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)
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}
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if block.Height != state.LastBlockHeight+1 {
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return fmt.Errorf("wrong Block.Header.Height. Expected %v, got %v",
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state.LastBlockHeight+1,
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block.Height,
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)
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}
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// Validate prev block info.
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if !block.LastBlockID.Equals(state.LastBlockID) {
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return fmt.Errorf("wrong Block.Header.LastBlockID. Expected %v, got %v",
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state.LastBlockID,
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block.LastBlockID,
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)
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}
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// Validate app info
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if !bytes.Equal(block.AppHash, state.AppHash) {
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return fmt.Errorf("wrong Block.Header.AppHash. Expected %X, got %v",
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state.AppHash,
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block.AppHash,
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)
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}
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if !bytes.Equal(block.ConsensusHash, state.ConsensusParams.Hash()) {
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return fmt.Errorf("wrong Block.Header.ConsensusHash. Expected %X, got %v",
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state.ConsensusParams.Hash(),
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block.ConsensusHash,
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)
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}
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if !bytes.Equal(block.LastResultsHash, state.LastResultsHash) {
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return fmt.Errorf("wrong Block.Header.LastResultsHash. Expected %X, got %v",
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state.LastResultsHash,
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block.LastResultsHash,
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)
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}
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if !bytes.Equal(block.ValidatorsHash, state.Validators.Hash()) {
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return fmt.Errorf("wrong Block.Header.ValidatorsHash. Expected %X, got %v",
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state.Validators.Hash(),
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block.ValidatorsHash,
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)
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}
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if !bytes.Equal(block.NextValidatorsHash, state.NextValidators.Hash()) {
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return fmt.Errorf("wrong Block.Header.NextValidatorsHash. Expected %X, got %v",
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state.NextValidators.Hash(),
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block.NextValidatorsHash,
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)
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}
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// Validate block LastCommit.
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if block.Height == 1 {
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if len(block.LastCommit.Signatures) != 0 {
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return errors.New("block at height 1 can't have LastCommit signatures")
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}
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} else {
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if len(block.LastCommit.Signatures) != state.LastValidators.Size() {
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return types.NewErrInvalidCommitSignatures(state.LastValidators.Size(), len(block.LastCommit.Signatures))
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}
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err := state.LastValidators.VerifyCommit(
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state.ChainID, state.LastBlockID, block.Height-1, block.LastCommit)
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if err != nil {
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return err
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}
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}
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// Validate block Time
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if block.Height > 1 {
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if !block.Time.After(state.LastBlockTime) {
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return fmt.Errorf("block time %v not greater than last block time %v",
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block.Time,
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state.LastBlockTime,
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)
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}
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medianTime := MedianTime(block.LastCommit, state.LastValidators)
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if !block.Time.Equal(medianTime) {
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return fmt.Errorf("invalid block time. Expected %v, got %v",
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medianTime,
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block.Time,
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)
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}
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} else if block.Height == 1 {
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genesisTime := state.LastBlockTime
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if !block.Time.Equal(genesisTime) {
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return fmt.Errorf("block time %v is not equal to genesis time %v",
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block.Time,
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genesisTime,
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)
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}
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}
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// Limit the amount of evidence
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maxNumEvidence, _ := types.MaxEvidencePerBlock(state.ConsensusParams.Block.MaxBytes)
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numEvidence := int64(len(block.Evidence.Evidence))
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if numEvidence > maxNumEvidence {
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return types.NewErrEvidenceOverflow(maxNumEvidence, numEvidence)
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}
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// Validate all evidence.
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for _, ev := range block.Evidence.Evidence {
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if err := VerifyEvidence(stateDB, state, ev); err != nil {
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return types.NewErrEvidenceInvalid(ev, err)
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}
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if evidencePool != nil && evidencePool.IsCommitted(ev) {
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return types.NewErrEvidenceInvalid(ev, errors.New("evidence was already committed"))
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}
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}
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// NOTE: We can't actually verify it's the right proposer because we dont
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// know what round the block was first proposed. So just check that it's
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// a legit address and a known validator.
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if len(block.ProposerAddress) != crypto.AddressSize ||
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!state.Validators.HasAddress(block.ProposerAddress) {
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return fmt.Errorf("block.Header.ProposerAddress, %X, is not a validator",
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block.ProposerAddress,
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)
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}
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return nil
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}
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// VerifyEvidence verifies the evidence fully by checking:
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// - it is sufficiently recent (MaxAge)
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// - it is from a key who was a validator at the given height
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// - it is internally consistent
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// - it was properly signed by the alleged equivocator
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func VerifyEvidence(stateDB dbm.DB, state State, evidence types.Evidence) error {
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height := state.LastBlockHeight
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evidenceAge := height - evidence.Height()
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maxAge := state.ConsensusParams.Evidence.MaxAge
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if evidenceAge > maxAge {
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return fmt.Errorf("evidence from height %d is too old. Min height is %d",
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evidence.Height(), height-maxAge)
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}
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valset, err := LoadValidators(stateDB, evidence.Height())
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if err != nil {
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// TODO: if err is just that we cant find it cuz we pruned, ignore.
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// TODO: if its actually bad evidence, punish peer
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return err
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}
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// The address must have been an active validator at the height.
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// NOTE: we will ignore evidence from H if the key was not a validator
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// at H, even if it is a validator at some nearby H'
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// XXX: this makes lite-client bisection as is unsafe
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// See https://github.com/tendermint/tendermint/issues/3244
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ev := evidence
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height, addr := ev.Height(), ev.Address()
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_, val := valset.GetByAddress(addr)
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if val == nil {
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return fmt.Errorf("address %X was not a validator at height %d", addr, height)
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}
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if err := evidence.Verify(state.ChainID, val.PubKey); err != nil {
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return err
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}
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return nil
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}
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