/
main.go
455 lines (405 loc) · 11.2 KB
/
main.go
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package main
import (
"bytes"
"context"
"crypto/ecdsa"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"math/big"
"net/http"
"os"
"strings"
"sync"
"time"
secp256k1 "github.com/btcsuite/btcd/btcec"
"github.com/edgelesssys/ego/ecrypto"
"github.com/edgelesssys/ego/enclave"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethclient"
vrf "github.com/vechain/go-ecvrf"
"github.com/smartbch/enclave-vrf/sgx-rand/utils"
)
// #include "util.h"
import "C"
var (
listenURL string
slaves []string
slaveUniqueIDs [][]byte
vrfPrivKey *secp256k1.PrivateKey
vrfPubkey []byte //compressed pubkey
)
var signer []byte
var isMaster bool
const (
httpsCertFile = "./cert.pem"
httpsKeyFile = "./key.pem"
keyFile = "/data/key.txt"
serverName = "SGX-VRF-ACCESS-CONTROL"
)
func main() {
initConfig()
recoveryPrivateKeyFromFile()
go createAndStartHttpsServer()
time.Sleep(time.Second)
if isMaster {
go slaveHandshake()
}
select {}
}
func initConfig() {
isMasterP := flag.Bool("m", false, "is master or not")
listenURLP := flag.String("l", "0.0.0.0:8082", "listen address")
signerArg := flag.String("s", "", "signer ID")
slaveString := flag.String("p", "", "slave address list seperated by comma")
slaveUniqIDArgs := flag.String("u", "", "slave unique id seperated by comma")
flag.Parse()
isMaster = *isMasterP
listenURL = *listenURLP
fmt.Println(isMaster)
fmt.Println(listenURL)
// get slaves
if *slaveString != "" {
slaves = strings.Split(*slaveString, ",")
}
if *slaveUniqIDArgs != "" {
slaveUniqueIDStrings := strings.Split(*slaveUniqIDArgs, ",")
for _, str := range slaveUniqueIDStrings {
id, err := hex.DecodeString(str)
if err != nil {
panic(err)
}
slaveUniqueIDs = append(slaveUniqueIDs, id)
}
}
if !isMaster && len(slaves) != 0 {
panic("slave should has no slaves")
}
if len(slaveUniqueIDs) != len(slaves) {
panic("number of slave address not match number of slave uniqueID")
}
if isMaster {
// get signer command line argument
var err error
signer, err = hex.DecodeString(*signerArg)
if err != nil {
panic(err)
}
if len(signer) == 0 {
flag.Usage()
return
}
}
}
func enableCors(w *http.ResponseWriter) {
(*w).Header().Set("Access-Control-Allow-Origin", "*")
(*w).Header().Set("Access-Control-Allow-Methods", "*")
(*w).Header().Set("Access-Control-Allow-Headers", "origin, content-type, accept")
}
func createAndStartHttpsServer() {
initHttpHandlers()
certificate, err := tls.LoadX509KeyPair(httpsCertFile, httpsKeyFile)
if err != nil {
panic(err)
}
cert := certificate.Certificate[0]
certHash := sha256.Sum256(cert)
// init handler for remote attestation
http.HandleFunc("/cert", func(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
w.Write([]byte(hex.EncodeToString(cert)))
})
http.HandleFunc("/peer-report", func(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
report, err := enclave.GetRemoteReport(certHash[:])
if err != nil {
panic(err)
}
w.Write([]byte(hex.EncodeToString(report)))
})
tlsCfg := tls.Config{
Certificates: []tls.Certificate{
certificate,
},
}
server := http.Server{Addr: listenURL, TLSConfig: &tlsCfg, ReadTimeout: 3 * time.Second, WriteTimeout: 5 * time.Second}
fmt.Println("listening ...")
err = server.ListenAndServeTLS("", "")
fmt.Println(err)
}
func initHttpHandlers() {
http.HandleFunc("/key", func(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
fmt.Printf("%v sent key to me\n", r.RemoteAddr)
if vrfPrivKey != nil {
return
}
keys := r.URL.Query()["k"]
if len(keys) == 0 {
return
}
key := keys[0]
authPrivKeyHex := strings.TrimPrefix(key, "0x")
keyBytes, err := hex.DecodeString(authPrivKeyHex)
if err != nil {
return
}
priv, pubkey := secp256k1.PrivKeyFromBytes(secp256k1.S256(), keyBytes)
vrfPrivKey = priv
vrfPubkey = pubkey.SerializeCompressed()
sealKeyToFile()
return
})
//#### `/skey?contract=<contract-address>&data=<calldata>&sig=<from-account-signature>`
http.HandleFunc("/skey", func(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
contractAddrBz, errResult := readParam(r.URL.Query(), "contract")
if errResult != nil {
ret, _ := json.Marshal(errResult)
w.Write(ret)
return
}
var contractAddr common.Address
copy(contractAddr[:], contractAddrBz)
callData, errResult := readParam(r.URL.Query(), "data")
if errResult != nil {
ret, _ := json.Marshal(errResult)
w.Write(ret)
return
}
sig, errResult := readParam(r.URL.Query(), "sig")
if errResult != nil {
ret, _ := json.Marshal(errResult)
w.Write(ret)
return
}
result := GetSymmetricKey(contractAddr, callData, sig, vrfPrivKey)
ret, _ := json.Marshal(result)
w.Write(ret)
})
http.HandleFunc("/ping", func(w http.ResponseWriter, r *http.Request) {
enableCors(&w)
w.WriteHeader(200)
w.Header().Set("Content-Type", "application/json; charset=utf-8")
type pong struct {
IsSuccess bool `json:"isSuccess"`
Message string `json:"message"`
}
p := pong{
IsSuccess: true,
Message: "pong",
}
out, _ := json.Marshal(p)
w.Write(out)
return
})
}
func readParam(query map[string][]string, key string) (param []byte, errResult *Result) {
values := query[key]
if len(values) == 0 {
return nil, nil
}
if len(values) > 1 {
errResult = &Result{
IsSuccess: false,
Message: key + " is not unique",
}
return
}
value := strings.TrimPrefix(values[0], "0x")
bz, err := hex.DecodeString(value)
if err != nil {
errResult = &Result{
IsSuccess: false,
Message: "cannot decode " + value,
}
return
}
return bz, nil
}
func slaveHandshake() {
for i, slave := range slaves {
verifySlaveAndSendKey(slave, slaveUniqueIDs[i])
}
}
func verifySlaveAndSendKey(slaveAddress string, uniqID []byte) {
certBytes := utils.VerifyServer(slaveAddress, signer, uniqID, verifyReport)
// Create a TLS config that uses the server certificate as root
// CA so that future connections to the server can be verified.
if len(vrfPubkey) != 0 {
cert, _ := x509.ParseCertificate(certBytes)
tlsConfig := &tls.Config{RootCAs: x509.NewCertPool(), ServerName: serverName}
tlsConfig.RootCAs.AddCert(cert)
utils.HttpGet(tlsConfig, "https://"+slaveAddress+fmt.Sprintf("/key?k=%s", hex.EncodeToString(vrfPrivKey.Serialize())))
fmt.Printf("send key to slave:%s passed\n", slaveAddress)
}
}
func generateRandom64Bytes() []byte {
var out []byte
var x C.uint16_t
var retry C.int = 1
for i := 0; i < 64; i++ {
C.rdrand_16(&x, retry)
out = append(out, byte(x))
}
return out
}
func verifyReport(reportBytes, certBytes, signer, uniqueID []byte) error {
report, err := enclave.VerifyRemoteReport(reportBytes)
if err != nil {
return err
}
return utils.CheckReport(report, certBytes, signer, uniqueID)
}
func recoveryPrivateKeyFromFile() {
fileData, err := os.ReadFile(keyFile)
if err != nil {
fmt.Printf("read file failed, %s\n", err.Error())
if os.IsNotExist(err) {
// maybe first run this enclave app
if isMaster {
generateVRFPrivateKey()
}
}
return
}
rawData, err := ecrypto.Unseal(fileData, nil)
if err != nil {
fmt.Printf("unseal file data failed, %s\n", err.Error())
return
}
vrfPrivKey, _ = secp256k1.PrivKeyFromBytes(secp256k1.S256(), rawData)
vrfPubkey = vrfPrivKey.PubKey().SerializeCompressed()
fmt.Println("recover vrf keys")
}
func generateVRFPrivateKey() {
priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), generateRandom64Bytes())
vrfPrivKey = priv
vrfPubkey = vrfPrivKey.PubKey().SerializeCompressed()
fmt.Printf("generate enclave vrf private key, its pubkey is: %s\n", hex.EncodeToString(vrfPubkey))
sealKeyToFile()
return
}
func sealKeyToFile() {
out, err := ecrypto.SealWithUniqueKey(vrfPrivKey.Serialize(), nil)
if err != nil {
panic(err)
}
err = os.WriteFile(keyFile, out, 0600)
if err != nil {
panic(err)
}
}
// ----------------------------------------------
const (
totalRpcTimeoutTime = 10 * time.Second
)
var rpcUrlList = []string{
"https://smartbch.fountainhead.cash/mainnet",
"https://global.uat.cash",
"https://sbch-mainnet.paralinker.com/api/v1/d9903215ca7eb50c7ac278fc6bcf19c6",
}
type Result struct {
IsSuccess bool
Message string
SymmetricKey string
Proof string
}
func GetSymmetricKey(contractAddr common.Address, callData, sig []byte, vrfKey *secp256k1.PrivateKey) Result {
if len(callData) < 4 {
return Result{Message: "Calldata Too Short"}
}
var from common.Address
if len(sig) != 0 {
hexCallData := hex.EncodeToString(callData)
txt := fmt.Sprintf("To vrf.cash: contract=%s, data=0x%s", contractAddr, hexCallData)
ethMsg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(txt), txt)
ethMsgHash := crypto.Keccak256([]byte(ethMsg))
pubkeyBz, err := crypto.Ecrecover(ethMsgHash, sig)
if err != nil {
return Result{Message: err.Error()}
}
pubkey, err := crypto.UnmarshalPubkey(pubkeyBz)
if err != nil {
return Result{Message: err.Error()}
}
from = crypto.PubkeyToAddress(*pubkey)
}
res, err := callContractFromNodes(rpcUrlList, contractAddr, from, callData)
if err != nil {
return Result{Message: err.Error()}
}
h := sha256.New()
h.Write(contractAddr[:])
h.Write(callData[:4])
hashBytes := h.Sum(res)
beta, pi, err := vrf.NewSecp256k1Sha256Tai().Prove((*ecdsa.PrivateKey)(vrfPrivKey), hashBytes)
if err != nil {
return Result{Message: err.Error()}
}
return Result{
IsSuccess: true,
SymmetricKey: "0x" + hex.EncodeToString(beta),
Proof: "0x" + hex.EncodeToString(pi),
}
}
func callContractFromNodes(rpcUrlList []string, contractAddr, from common.Address, callData []byte) ([]byte, error) {
return getFromAllServers(func(rpcUrl string) ([]byte, error) {
return callContractFromOneNode(rpcUrl, contractAddr, from, callData)
})
}
func getFromAllServers(getter func(rpcUrl string) ([]byte, error)) ([]byte, error) {
if len(rpcUrlList) == 0 {
panic("empty rpcUrlList")
}
resList := make([][]byte, len(rpcUrlList))
errList := make([]error, len(rpcUrlList))
wg := sync.WaitGroup{}
wg.Add(len(rpcUrlList))
for i, rpcUrl := range rpcUrlList {
go func(idx int, url string) {
resList[idx], errList[idx] = getter(url)
wg.Done()
}(i, rpcUrl)
}
wg.Wait()
// fail if one of nodes return error
for idx, err := range errList {
if err != nil {
return nil, fmt.Errorf("failed to query %s: %s", rpcUrlList[idx], err.Error())
}
}
// the results must be all equal
firstRes := resList[0]
for i := 1; i < len(resList); i++ {
if !bytes.Equal(firstRes, resList[i]) {
return nil, fmt.Errorf("result mismatch between %s and %s", rpcUrlList[0], rpcUrlList[i])
}
}
return firstRes, nil
}
func callContractFromOneNode(rpcUrl string, contractAddr, from common.Address, callData []byte) ([]byte, error) {
//fmt.Println(rpcUrl)
ctx, cancelFn := context.WithTimeout(context.Background(), totalRpcTimeoutTime)
defer cancelFn()
ethClient, err := ethclient.DialContext(ctx, rpcUrl)
if err != nil {
return nil, err
}
defer ethClient.Close()
msg := ethereum.CallMsg{
From: from,
To: &contractAddr,
GasPrice: big.NewInt(1),
Value: big.NewInt(0),
Data: callData,
}
out, err := ethClient.CallContract(ctx, msg, nil)
return out, err
}