337 lines
13 KiB
Go
337 lines
13 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package checkpointoracle
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/binary"
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"errors"
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"math/big"
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"reflect"
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"sort"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/contracts/checkpointoracle/contract"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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)
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var (
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emptyHash = [32]byte{}
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checkpoint0 = params.TrustedCheckpoint{
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SectionIndex: 0,
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SectionHead: common.HexToHash("0x7fa3c32f996c2bfb41a1a65b3d8ea3e0a33a1674cde43678ad6f4235e764d17d"),
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CHTRoot: common.HexToHash("0x98fc5d3de23a0fecebad236f6655533c157d26a1aedcd0852a514dc1169e6350"),
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BloomRoot: common.HexToHash("0x99b5adb52b337fe25e74c1c6d3835b896bd638611b3aebddb2317cce27a3f9fa"),
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}
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checkpoint1 = params.TrustedCheckpoint{
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SectionIndex: 1,
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SectionHead: common.HexToHash("0x2d4dee68102125e59b0cc61b176bd89f0d12b3b91cfaf52ef8c2c82fb920c2d2"),
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CHTRoot: common.HexToHash("0x7d428008ece3b4c4ef5439f071930aad0bb75108d381308df73beadcd01ded95"),
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BloomRoot: common.HexToHash("0x652571f7736de17e7bbb427ac881474da684c6988a88bf51b10cca9a2ee148f4"),
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}
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checkpoint2 = params.TrustedCheckpoint{
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SectionIndex: 2,
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SectionHead: common.HexToHash("0x61c0de578c0115b1dff8ef39aa600588c7c6ecb8a2f102003d7cf4c4146e9291"),
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CHTRoot: common.HexToHash("0x407a08a407a2bc3838b74ca3eb206903c9c8a186ccf5ef14af07794efff1970b"),
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BloomRoot: common.HexToHash("0x058b4161f558ce295a92925efc57f34f9210d5a30088d7475c183e0d3e58f5ac"),
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}
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)
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var (
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// The block frequency for creating checkpoint(only used in test)
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sectionSize = big.NewInt(512)
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// The number of confirmations needed to generate a checkpoint(only used in test).
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processConfirms = big.NewInt(4)
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)
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// validateOperation executes the operation, watches and delivers all events fired by the backend and ensures the
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// correctness by assert function.
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func validateOperation(t *testing.T, c *contract.CheckpointOracle, backend *backends.SimulatedBackend, operation func(),
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assert func(<-chan *contract.CheckpointOracleNewCheckpointVote) error, opName string) {
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// Watch all events and deliver them to assert function
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var (
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sink = make(chan *contract.CheckpointOracleNewCheckpointVote)
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sub, _ = c.WatchNewCheckpointVote(nil, sink, nil)
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)
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defer func() {
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// Close all subscribers
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sub.Unsubscribe()
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}()
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operation()
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// flush pending block
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backend.Commit()
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if err := assert(sink); err != nil {
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t.Errorf("operation {%s} failed, err %s", opName, err)
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}
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}
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// validateEvents checks that the correct number of contract events
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// fired by contract backend.
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func validateEvents(target int, sink interface{}) (bool, []reflect.Value) {
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chanval := reflect.ValueOf(sink)
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chantyp := chanval.Type()
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if chantyp.Kind() != reflect.Chan || chantyp.ChanDir()&reflect.RecvDir == 0 {
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return false, nil
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}
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count := 0
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var recv []reflect.Value
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timeout := time.After(1 * time.Second)
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cases := []reflect.SelectCase{{Chan: chanval, Dir: reflect.SelectRecv}, {Chan: reflect.ValueOf(timeout), Dir: reflect.SelectRecv}}
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for {
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chose, v, _ := reflect.Select(cases)
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if chose == 1 {
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// Not enough event received
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return false, nil
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}
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count += 1
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recv = append(recv, v)
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if count == target {
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break
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}
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}
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done := time.After(50 * time.Millisecond)
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cases = cases[:1]
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cases = append(cases, reflect.SelectCase{Chan: reflect.ValueOf(done), Dir: reflect.SelectRecv})
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chose, _, _ := reflect.Select(cases)
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// If chose equal 0, it means receiving redundant events.
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return chose == 1, recv
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}
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func signCheckpoint(addr common.Address, privateKey *ecdsa.PrivateKey, index uint64, hash common.Hash) []byte {
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// EIP 191 style signatures
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//
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// Arguments when calculating hash to validate
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// 1: byte(0x19) - the initial 0x19 byte
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// 2: byte(0) - the version byte (data with intended validator)
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// 3: this - the validator address
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// -- Application specific data
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// 4 : checkpoint section_index(uint64)
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// 5 : checkpoint hash (bytes32)
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// hash = keccak256(checkpoint_index, section_head, cht_root, bloom_root)
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buf := make([]byte, 8)
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binary.BigEndian.PutUint64(buf, index)
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data := append([]byte{0x19, 0x00}, append(addr.Bytes(), append(buf, hash.Bytes()...)...)...)
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sig, _ := crypto.Sign(crypto.Keccak256(data), privateKey)
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sig[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
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return sig
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}
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// assertSignature verifies whether the recovered signers are equal with expected.
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func assertSignature(addr common.Address, index uint64, hash [32]byte, r, s [32]byte, v uint8, expect common.Address) bool {
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buf := make([]byte, 8)
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binary.BigEndian.PutUint64(buf, index)
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data := append([]byte{0x19, 0x00}, append(addr.Bytes(), append(buf, hash[:]...)...)...)
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pubkey, err := crypto.Ecrecover(crypto.Keccak256(data), append(r[:], append(s[:], v-27)...))
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if err != nil {
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return false
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}
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var signer common.Address
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copy(signer[:], crypto.Keccak256(pubkey[1:])[12:])
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return bytes.Equal(signer.Bytes(), expect.Bytes())
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}
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type Account struct {
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key *ecdsa.PrivateKey
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addr common.Address
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}
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type Accounts []Account
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func (a Accounts) Len() int { return len(a) }
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func (a Accounts) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a Accounts) Less(i, j int) bool { return bytes.Compare(a[i].addr.Bytes(), a[j].addr.Bytes()) < 0 }
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func TestCheckpointRegister(t *testing.T) {
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// Initialize test accounts
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var accounts Accounts
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for i := 0; i < 3; i++ {
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key, _ := crypto.GenerateKey()
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addr := crypto.PubkeyToAddress(key.PublicKey)
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accounts = append(accounts, Account{key: key, addr: addr})
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}
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sort.Sort(accounts)
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// Deploy registrar contract
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contractBackend := backends.NewSimulatedBackend(core.GenesisAlloc{accounts[0].addr: {Balance: big.NewInt(1000000000)}, accounts[1].addr: {Balance: big.NewInt(1000000000)}, accounts[2].addr: {Balance: big.NewInt(1000000000)}}, 10000000)
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defer contractBackend.Close()
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transactOpts := bind.NewKeyedTransactor(accounts[0].key)
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// 3 trusted signers, threshold 2
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contractAddr, _, c, err := contract.DeployCheckpointOracle(transactOpts, contractBackend, []common.Address{accounts[0].addr, accounts[1].addr, accounts[2].addr}, sectionSize, processConfirms, big.NewInt(2))
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if err != nil {
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t.Error("Failed to deploy registrar contract", err)
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}
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contractBackend.Commit()
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// getRecent returns block height and hash of the head parent.
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getRecent := func() (*big.Int, common.Hash) {
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parentNumber := new(big.Int).Sub(contractBackend.Blockchain().CurrentHeader().Number, big.NewInt(1))
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parentHash := contractBackend.Blockchain().CurrentHeader().ParentHash
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return parentNumber, parentHash
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}
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// collectSig generates specified number signatures.
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collectSig := func(index uint64, hash common.Hash, n int, unauthorized *ecdsa.PrivateKey) (v []uint8, r [][32]byte, s [][32]byte) {
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for i := 0; i < n; i++ {
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sig := signCheckpoint(contractAddr, accounts[i].key, index, hash)
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if unauthorized != nil {
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sig = signCheckpoint(contractAddr, unauthorized, index, hash)
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}
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r = append(r, common.BytesToHash(sig[:32]))
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s = append(s, common.BytesToHash(sig[32:64]))
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v = append(v, sig[64])
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}
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return v, r, s
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}
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// insertEmptyBlocks inserts a batch of empty blocks to blockchain.
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insertEmptyBlocks := func(number int) {
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for i := 0; i < number; i++ {
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contractBackend.Commit()
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}
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}
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// assert checks whether the current contract status is same with
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// the expected.
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assert := func(index uint64, hash [32]byte, height *big.Int) error {
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lindex, lhash, lheight, err := c.GetLatestCheckpoint(nil)
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if err != nil {
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return err
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}
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if lindex != index {
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return errors.New("latest checkpoint index mismatch")
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}
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if !bytes.Equal(lhash[:], hash[:]) {
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return errors.New("latest checkpoint hash mismatch")
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}
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if lheight.Cmp(height) != 0 {
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return errors.New("latest checkpoint height mismatch")
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}
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return nil
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}
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// Test future checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(0, checkpoint0.Hash(), 2, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint0.Hash(), 0, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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return assert(0, emptyHash, big.NewInt(0))
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}, "test future checkpoint registration")
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insertEmptyBlocks(int(sectionSize.Uint64() + processConfirms.Uint64()))
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// Test transaction replay protection
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validateOperation(t, c, contractBackend, func() {
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number, _ := getRecent()
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v, r, s := collectSig(0, checkpoint0.Hash(), 2, nil)
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hash := common.HexToHash("deadbeef")
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c.SetCheckpoint(transactOpts, number, hash, checkpoint0.Hash(), 0, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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return assert(0, emptyHash, big.NewInt(0))
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}, "test transaction replay protection")
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// Test unauthorized signature checking
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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u, _ := crypto.GenerateKey()
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v, r, s := collectSig(0, checkpoint0.Hash(), 2, u)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint0.Hash(), 0, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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return assert(0, emptyHash, big.NewInt(0))
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}, "test unauthorized signature checking")
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// Test un-multi-signature checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(0, checkpoint0.Hash(), 1, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint0.Hash(), 0, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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return assert(0, emptyHash, big.NewInt(0))
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}, "test un-multi-signature checkpoint registration")
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// Test valid checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(0, checkpoint0.Hash(), 2, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint0.Hash(), 0, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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if valid, recv := validateEvents(2, events); !valid {
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return errors.New("receive incorrect number of events")
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} else {
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for i := 0; i < len(recv); i++ {
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event := recv[i].Interface().(*contract.CheckpointOracleNewCheckpointVote)
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if !assertSignature(contractAddr, event.Index, event.CheckpointHash, event.R, event.S, event.V, accounts[i].addr) {
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return errors.New("recover signer failed")
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}
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}
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}
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number, _ := getRecent()
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return assert(0, checkpoint0.Hash(), number.Add(number, big.NewInt(1)))
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}, "test valid checkpoint registration")
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distance := 3*sectionSize.Uint64() + processConfirms.Uint64() - contractBackend.Blockchain().CurrentHeader().Number.Uint64()
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insertEmptyBlocks(int(distance))
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// Test uncontinuous checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(2, checkpoint2.Hash(), 2, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint2.Hash(), 2, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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if valid, recv := validateEvents(2, events); !valid {
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return errors.New("receive incorrect number of events")
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} else {
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for i := 0; i < len(recv); i++ {
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event := recv[i].Interface().(*contract.CheckpointOracleNewCheckpointVote)
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if !assertSignature(contractAddr, event.Index, event.CheckpointHash, event.R, event.S, event.V, accounts[i].addr) {
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return errors.New("recover signer failed")
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}
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}
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}
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number, _ := getRecent()
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return assert(2, checkpoint2.Hash(), number.Add(number, big.NewInt(1)))
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}, "test uncontinuous checkpoint registration")
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// Test old checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(1, checkpoint1.Hash(), 2, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint1.Hash(), 1, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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number, _ := getRecent()
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return assert(2, checkpoint2.Hash(), number)
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}, "test uncontinuous checkpoint registration")
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// Test stale checkpoint registration
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validateOperation(t, c, contractBackend, func() {
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number, hash := getRecent()
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v, r, s := collectSig(2, checkpoint2.Hash(), 2, nil)
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c.SetCheckpoint(transactOpts, number, hash, checkpoint2.Hash(), 2, v, r, s)
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}, func(events <-chan *contract.CheckpointOracleNewCheckpointVote) error {
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number, _ := getRecent()
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return assert(2, checkpoint2.Hash(), number.Sub(number, big.NewInt(1)))
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}, "test stale checkpoint registration")
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}
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