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125 lines
4.2 KiB
125 lines
4.2 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/types"
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dbm "github.com/tendermint/tmlibs/db"
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)
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//-----------------------------------------------------
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// Validate block
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func validateBlock(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.ChainID != state.ChainID {
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return fmt.Errorf("Wrong Block.Header.ChainID. Expected %v, got %v", state.ChainID, block.ChainID)
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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", state.LastBlockHeight+1, block.Height)
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}
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/* TODO: Determine bounds for Time
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See blockchain/reactor "stopSyncingDurationMinutes"
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if !block.Time.After(lastBlockTime) {
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return errors.New("Invalid Block.Header.Time")
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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", state.LastBlockID, block.LastBlockID)
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}
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newTxs := int64(len(block.Data.Txs))
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if block.TotalTxs != state.LastBlockTotalTx+newTxs {
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return fmt.Errorf("Wrong Block.Header.TotalTxs. Expected %v, got %v", state.LastBlockTotalTx+newTxs, block.TotalTxs)
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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", state.AppHash, block.AppHash)
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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", state.ConsensusParams.Hash(), block.ConsensusHash)
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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", state.LastResultsHash, block.LastResultsHash)
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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", state.Validators.Hash(), block.ValidatorsHash)
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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.Precommits) != 0 {
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return errors.New("Block at height 1 (first block) should have no LastCommit precommits")
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}
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} else {
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if len(block.LastCommit.Precommits) != state.LastValidators.Size() {
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return fmt.Errorf("Invalid block commit size. Expected %v, got %v",
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state.LastValidators.Size(), len(block.LastCommit.Precommits))
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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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// TODO: Each check requires loading an old validator set.
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// We should cap the amount of evidence per block
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// to prevent potential proposer DoS.
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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.NewEvidenceInvalidErr(ev, err)
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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.EvidenceParams.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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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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