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267 lines
8.4 KiB
267 lines
8.4 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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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/types"
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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.App != state.Version.Consensus.App ||
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block.Version.Block != state.Version.Consensus.Block {
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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 state.LastBlockHeight == 0 && block.Height != state.InitialHeight {
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return fmt.Errorf("wrong Block.Header.Height. Expected %v for initial block, got %v",
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block.Height, state.InitialHeight)
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}
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if state.LastBlockHeight > 0 && 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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hashCP := types.HashConsensusParams(state.ConsensusParams)
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if !bytes.Equal(block.ConsensusHash, hashCP) {
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return fmt.Errorf("wrong Block.Header.ConsensusHash. Expected %X, got %v",
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hashCP,
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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 == state.InitialHeight {
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if len(block.LastCommit.Signatures) != 0 {
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return errors.New("initial block can't have LastCommit signatures")
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}
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} else {
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// LastCommit.Signatures length is checked in VerifyCommit.
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if err := state.LastValidators.VerifyCommit(
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state.ChainID, state.LastBlockID, block.Height-1, block.LastCommit); err != nil {
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return err
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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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return fmt.Errorf("expected ProposerAddress size %d, got %d",
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crypto.AddressSize,
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len(block.ProposerAddress),
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)
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}
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if !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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// Validate block Time
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switch {
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case block.Height > state.InitialHeight:
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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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case block.Height == state.InitialHeight:
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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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default:
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return fmt.Errorf("block height %v lower than initial height %v",
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block.Height, state.InitialHeight)
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}
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// Limit the amount of evidence
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numEvidence := len(block.Evidence.Evidence)
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// MaxNumEvidence is capped at uint16, so conversion is always safe.
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if maxEvidence := int(state.ConsensusParams.Evidence.MaxNum); numEvidence > maxEvidence {
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return types.NewErrEvidenceOverflow(maxEvidence, numEvidence)
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}
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// Validate all evidence.
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for idx, ev := range block.Evidence.Evidence {
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// check that no evidence has been submitted more than once
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for i := idx + 1; i < len(block.Evidence.Evidence); i++ {
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if ev.Equal(block.Evidence.Evidence[i]) {
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return types.NewErrEvidenceInvalid(ev, errors.New("evidence was submitted twice"))
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}
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}
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if evidencePool != nil {
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if 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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if evidencePool.IsPending(ev) {
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continue
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}
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}
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// if we don't already have amnesia evidence we need to add it to start our own trial period unless
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// a) a valid polc has already been attached
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// b) the accused node voted back on an earlier round
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if ae, ok := ev.(*types.AmnesiaEvidence); ok && ae.Polc.IsAbsent() && ae.PotentialAmnesiaEvidence.VoteA.Round <
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ae.PotentialAmnesiaEvidence.VoteB.Round {
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if err := evidencePool.AddEvidence(ae.PotentialAmnesiaEvidence); err != nil {
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return types.NewErrEvidenceInvalid(ev,
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fmt.Errorf("unknown amnesia evidence, trying to add to evidence pool, err: %w", err))
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}
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return types.NewErrEvidenceInvalid(ev, errors.New("amnesia evidence is new and hasn't undergone trial period yet"))
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}
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// A header needs to be fetched. For lunatic evidence this is so we can verify
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// that some of the fields are different to the ones we have. For all evidence it
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// it so we can verify that the time of the evidence is correct
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header := evidencePool.Header(ev.Height())
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if header == nil {
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return fmt.Errorf("don't have block meta at height #%d", ev.Height())
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}
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if err := VerifyEvidence(stateDB, state, ev, header); err != nil {
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return types.NewErrEvidenceInvalid(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, committedHeader *types.Header) error {
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var (
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height = state.LastBlockHeight
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evidenceParams = state.ConsensusParams.Evidence
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ageDuration = state.LastBlockTime.Sub(evidence.Time())
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ageNumBlocks = height - evidence.Height()
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)
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if committedHeader.Time != evidence.Time() {
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return fmt.Errorf("evidence time (%v) is different to the time of the header we have for the same height (%v)",
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evidence.Time(),
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committedHeader.Time,
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)
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}
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if ageDuration > evidenceParams.MaxAgeDuration && ageNumBlocks > evidenceParams.MaxAgeNumBlocks {
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return fmt.Errorf(
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"evidence from height %d (created at: %v) is too old; min height is %d and evidence can not be older than %v",
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evidence.Height(),
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evidence.Time(),
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height-evidenceParams.MaxAgeNumBlocks,
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state.LastBlockTime.Add(evidenceParams.MaxAgeDuration),
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)
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}
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if ev, ok := evidence.(*types.LunaticValidatorEvidence); ok {
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if err := ev.VerifyHeader(committedHeader); err != nil {
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return err
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}
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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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addr := evidence.Address()
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var val *types.Validator
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if ae, ok := evidence.(*types.AmnesiaEvidence); ok {
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// check the validator set against the polc to make sure that a majority of valid votes was reached
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if !ae.Polc.IsAbsent() {
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err = ae.Polc.ValidateVotes(valset, state.ChainID)
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if err != nil {
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return fmt.Errorf("amnesia evidence contains invalid polc, err: %w", err)
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}
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}
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}
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// For all other types, expect evidence.Address to be a validator at height
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// evidence.Height.
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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, evidence.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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