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accounts, eth, clique: implement external backend + move sighash calc to backend

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This commit is contained in:
Martin Holst Swende 2018-11-11 00:47:15 +01:00
parent ae857e74bf
commit 22633db7c9
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GPG key ID: 683B438C05A5DDF0
12 changed files with 360 additions and 96 deletions
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69
accounts/accounts.go
View file

@ -18,12 +18,16 @@
package accounts
import (
"fmt"
"math/big"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rlp"
"golang.org/x/crypto/sha3"
)
// Account represents an Ethereum account located at a specific location defined
@ -87,8 +91,7 @@ type Wallet interface {
// chain state reader.
SelfDerive(base DerivationPath, chain ethereum.ChainStateReader)
// SignHash requests the wallet to sign the given hash.
//
// SignCliqueHeader requests the wallet to sign the hash of a given Clique header
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
@ -98,7 +101,20 @@ type Wallet interface {
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignHash(account Account, hash []byte) ([]byte, error)
SignCliqueHeader(account Account, header *types.Header) ([]byte, error)
// Signtext requests the wallet to sign the hash of a given piece of data, prefixed
// by the Ethereum prefix scheme
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
//
// If the wallet requires additional authentication to sign the request (e.g.
// a password to decrypt the account, or a PIN code o verify the transaction),
// an AuthNeededError instance will be returned, containing infos for the user
// about which fields or actions are needed. The user may retry by providing
// the needed details via SignHashWithPassphrase, or by other means (e.g. unlock
// the account in a keystore).
SignText(account Account, text []byte) ([]byte, error)
// SignTx requests the wallet to sign the given transaction.
//
@ -113,12 +129,12 @@ type Wallet interface {
// the account in a keystore).
SignTx(account Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error)
// SignHashWithPassphrase requests the wallet to sign the given hash with the
// SignTextWithPassphrase requests the wallet to sign the given text with the
// given passphrase as extra authentication information.
//
// It looks up the account specified either solely via its address contained within,
// or optionally with the aid of any location metadata from the embedded URL field.
SignHashWithPassphrase(account Account, passphrase string, hash []byte) ([]byte, error)
SignTextWithPassphrase(account Account, passphrase string, hash []byte) ([]byte, error)
// SignTxWithPassphrase requests the wallet to sign the given transaction, with the
// given passphrase as extra authentication information.
@ -148,6 +164,49 @@ type Backend interface {
Subscribe(sink chan<- WalletEvent) event.Subscription
}
// TextHash is a helper function that calculates a hash for the given message that can be
// safely used to calculate a signature from.
//
// The hash is calulcated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func TextHash(data []byte) []byte {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg))
}
// sigHash returns the hash which is used as input for the proof-of-authority
// signing. It is the hash of the entire header apart from the 65 byte signature
// contained at the end of the extra data.
//
// Note, the method requires the extra data to be at least 65 bytes, otherwise it
// panics. This is done to avoid accidentally using both forms (signature present
// or not), which could be abused to produce different hashes for the same header.
func CliqueHash(header *types.Header) (hash common.Hash) {
hasher := sha3.NewLegacyKeccak256()
rlp.Encode(hasher, []interface{}{
header.ParentHash,
header.UncleHash,
header.Coinbase,
header.Root,
header.TxHash,
header.ReceiptHash,
header.Bloom,
header.Difficulty,
header.Number,
header.GasLimit,
header.GasUsed,
header.Time,
header.Extra[:len(header.Extra)-65], // Yes, this will panic if extra is too short
header.MixDigest,
header.Nonce,
})
hasher.Sum(hash[:0])
return hash
}
// WalletEventType represents the different event types that can be fired by
// the wallet subscription subsystem.
type WalletEventType int

197
accounts/external/backend.go vendored Normal file
View file

@ -0,0 +1,197 @@
package external
import (
"errors"
"fmt"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/signer/core"
"math/big"
"sync"
)
type ExternalBackend struct {
signers []accounts.Wallet
}
func (eb *ExternalBackend) Wallets() []accounts.Wallet {
return eb.signers
}
func NewExternalBackend(endpoint string) (*ExternalBackend, error) {
signer, err := NewExternalSigner(endpoint)
if err != nil {
return nil, err
}
return &ExternalBackend{
signers: []accounts.Wallet{ signer},
}, nil
}
func (eb *ExternalBackend) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription {
return event.NewSubscription(func(quit <-chan struct{}) error {
<-quit
return nil
})
}
// ExternalSigner provides an API to interact with an external signer (clef)
// It proxies request to the external signer while forwarding relevant
// request headers
type ExternalSigner struct {
client *rpc.Client
endpoint string
cacheMu sync.RWMutex
cache []accounts.Account
}
func NewExternalSigner(endpoint string) (*ExternalSigner, error) {
client, err := rpc.DialHTTP(endpoint)
if err != nil {
return nil, err
}
return &ExternalSigner{
client: client,
endpoint: endpoint,
}, nil
}
func (api *ExternalSigner) URL() accounts.URL {
return accounts.URL{
Scheme: "extapi",
Path: api.endpoint,
}
}
func (api *ExternalSigner) Status() (string, error) {
return "ok", nil
}
func (api *ExternalSigner) Open(passphrase string) error {
return fmt.Errorf("operation not supported on external signers")
}
func (api *ExternalSigner) Close() error {
return fmt.Errorf("operation not supported on external signers")
}
func (api *ExternalSigner) Accounts() []accounts.Account {
var accnts []accounts.Account
res, err := api.listAccounts()
if err != nil {
log.Error("account listing failed", "error", err)
return accnts
}
for _, addr := range res {
accnts = append(accnts, accounts.Account{
URL: accounts.URL{
Scheme: "extapi",
Path: api.endpoint,
},
Address: addr,
})
}
api.cacheMu.Lock()
api.cache = accnts
api.cacheMu.Unlock()
return accnts
}
func (api *ExternalSigner) Contains(account accounts.Account) bool {
api.cacheMu.RLock()
defer api.cacheMu.RUnlock()
for _, a := range api.cache{
if a.Address == account.Address && (account.URL == (accounts.URL{}) || account.URL == api.URL()){
return true
}
}
return false
}
func (api *ExternalSigner) Derive(path accounts.DerivationPath, pin bool) (accounts.Account, error) {
return accounts.Account{}, fmt.Errorf("operation not supported on external signers")
}
func (api *ExternalSigner) SelfDerive(base accounts.DerivationPath, chain ethereum.ChainStateReader) {
log.Error("operation SelfDerive not supported on external signers")
}
func (api *ExternalSigner) signHash(account accounts.Account, hash []byte) ([]byte, error) {
return []byte{}, fmt.Errorf("operation not supported on external signers")
}
// SignCliqueHeader implements accounts.Wallet, attempting to sign the given clique header
func (api *ExternalSigner) SignCliqueHeader(account accounts.Account, header *types.Header) ([]byte, error) {
// TODO! Replace this with a call to clef SignData with correct mime-type for Clique, once we
// have that in place
return api.signHash(account, accounts.CliqueHash(header).Bytes())
}
func (api *ExternalSigner) SignText(account accounts.Account, text []byte)([]byte, error){
return api.signHash(account, accounts.TextHash(text))
}
func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
res := ethapi.SignTransactionResult{}
to := common.NewMixedcaseAddress(*tx.To())
data := hexutil.Bytes(tx.Data())
args := &core.SendTxArgs{
Data: &data,
Nonce: hexutil.Uint64(tx.Nonce()),
Value: hexutil.Big(*tx.Value()),
Gas: hexutil.Uint64(tx.Gas()),
GasPrice: hexutil.Big(*tx.GasPrice()),
To: &to,
From: common.NewMixedcaseAddress(account.Address),
}
if err := api.client.Call(&res, "account_signTransaction", args); err != nil {
return nil, err
}
return res.Tx, nil
}
func (api *ExternalSigner) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {
return []byte{}, fmt.Errorf("operation not supported on external signers")
}
func (api *ExternalSigner) SignTxWithPassphrase(account accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
return nil, fmt.Errorf("operation not supported on external signers")
}
func (api *ExternalSigner) listAccounts() ([]common.Address, error) {
var res []common.Address
if err := api.client.Call(&res, "account_list"); err != nil {
return nil, err
}
return res, nil
}
func (api *ExternalSigner) newAccount() (common.Address, error) {
var res accounts.Account
if err := api.client.Call(&res, "account_new"); err != nil {
return common.Address{}, err
}
return res.Address, nil
}
func (api *ExternalSigner) signCliqueBlock(a common.Address, rlpBlock hexutil.Bytes) (hexutil.Bytes, error) {
if api == nil {
return nil, errors.New("External API not initialized")
}
var sig hexutil.Bytes
if err := api.client.Call(&sig, "account_signData", "application/clique", a, rlpBlock); err != nil {
return nil, err
}
if sig[64] != 27 && sig[64] != 28 {
return nil, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[64] -= 27 // Transform V from 27/28 to 0/1 for Clique use
return sig, nil
}

17
accounts/keystore/wallet.go
View file

@ -78,11 +78,11 @@ func (w *keystoreWallet) Derive(path accounts.DerivationPath, pin bool) (account
// there is no notion of hierarchical account derivation for plain keystore accounts.
func (w *keystoreWallet) SelfDerive(base accounts.DerivationPath, chain ethereum.ChainStateReader) {}
// SignHash implements accounts.Wallet, attempting to sign the given hash with
// signHash attempts to sign the given hash with
// the given account. If the wallet does not wrap this particular account, an
// error is returned to avoid account leakage (even though in theory we may be
// able to sign via our shared keystore backend).
func (w *keystoreWallet) SignHash(account accounts.Account, hash []byte) ([]byte, error) {
func (w *keystoreWallet) signHash(account accounts.Account, hash []byte) ([]byte, error) {
// Make sure the requested account is contained within
if !w.Contains(account) {
return nil, accounts.ErrUnknownAccount
@ -91,6 +91,15 @@ func (w *keystoreWallet) SignHash(account accounts.Account, hash []byte) ([]byte
return w.keystore.SignHash(account, hash)
}
// SignCliqueHeader implements accounts.Wallet, attempting to sign the given clique header
func (w *keystoreWallet) SignCliqueHeader(account accounts.Account, header *types.Header) ([]byte, error) {
return w.signHash(account, accounts.CliqueHash(header).Bytes())
}
func (w *keystoreWallet) SignText(account accounts.Account, text []byte) ([]byte, error) {
return w.signHash(account, accounts.TextHash(text))
}
// SignTx implements accounts.Wallet, attempting to sign the given transaction
// with the given account. If the wallet does not wrap this particular account,
// an error is returned to avoid account leakage (even though in theory we may
@ -106,13 +115,13 @@ func (w *keystoreWallet) SignTx(account accounts.Account, tx *types.Transaction,
// SignHashWithPassphrase implements accounts.Wallet, attempting to sign the
// given hash with the given account using passphrase as extra authentication.
func (w *keystoreWallet) SignHashWithPassphrase(account accounts.Account, passphrase string, hash []byte) ([]byte, error) {
func (w *keystoreWallet) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {
// Make sure the requested account is contained within
if !w.Contains(account) {
return nil, accounts.ErrUnknownAccount
}
// Account seems valid, request the keystore to sign
return w.keystore.SignHashWithPassphrase(account, passphrase, hash)
return w.keystore.SignHashWithPassphrase(account, passphrase, accounts.TextHash(text))
}
// SignTxWithPassphrase implements accounts.Wallet, attempting to sign the given

17
accounts/usbwallet/wallet.go
View file

@ -495,12 +495,21 @@ func (w *wallet) SelfDerive(base accounts.DerivationPath, chain ethereum.ChainSt
w.deriveChain = chain
}
// SignHash implements accounts.Wallet, however signing arbitrary data is not
// signHash implements accounts.Wallet, however signing arbitrary data is not
// supported for hardware wallets, so this method will always return an error.
func (w *wallet) SignHash(account accounts.Account, hash []byte) ([]byte, error) {
func (w *wallet) signHash(account accounts.Account, hash []byte) ([]byte, error) {
return nil, accounts.ErrNotSupported
}
// SignCliqueHeader implements accounts.Wallet, attempting to sign the given clique header
func (w *wallet) SignCliqueHeader(account accounts.Account, header *types.Header) ([]byte, error) {
return w.signHash(account, accounts.CliqueHash(header).Bytes())
}
func (w *wallet) SignText(account accounts.Account, text []byte) ([]byte, error) {
return w.signHash(account, accounts.TextHash(text))
}
// SignTx implements accounts.Wallet. It sends the transaction over to the Ledger
// wallet to request a confirmation from the user. It returns either the signed
// transaction or a failure if the user denied the transaction.
@ -550,8 +559,8 @@ func (w *wallet) SignTx(account accounts.Account, tx *types.Transaction, chainID
// SignHashWithPassphrase implements accounts.Wallet, however signing arbitrary
// data is not supported for Ledger wallets, so this method will always return
// an error.
func (w *wallet) SignHashWithPassphrase(account accounts.Account, passphrase string, hash []byte) ([]byte, error) {
return w.SignHash(account, hash)
func (w *wallet) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {
return w.SignText(account, accounts.TextHash(text))
}
// SignTxWithPassphrase implements accounts.Wallet, attempting to sign the given

6
cmd/geth/main.go
View file

@ -60,6 +60,7 @@ var (
utils.BootnodesV5Flag,
utils.DataDirFlag,
utils.KeyStoreDirFlag,
utils.ExternalSignerFlag,
utils.NoUSBFlag,
utils.DashboardEnabledFlag,
utils.DashboardAddrFlag,
@ -280,8 +281,8 @@ func startNode(ctx *cli.Context, stack *node.Node) {
utils.StartNode(stack)
// Unlock any account specifically requested
ks := stack.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
if keystores := stack.AccountManager().Backends(keystore.KeyStoreType); len(keystores) > 0{
ks := keystores[0].(*keystore.KeyStore)
passwords := utils.MakePasswordList(ctx)
unlocks := strings.Split(ctx.GlobalString(utils.UnlockedAccountFlag.Name), ",")
for i, account := range unlocks {
@ -289,6 +290,7 @@ func startNode(ctx *cli.Context, stack *node.Node) {
unlockAccount(ctx, ks, trimmed, i, passwords)
}
}
}
// Register wallet event handlers to open and auto-derive wallets
events := make(chan accounts.WalletEvent, 16)
stack.AccountManager().Subscribe(events)

1
cmd/geth/usage.go
View file

@ -143,6 +143,7 @@ var AppHelpFlagGroups = []flagGroup{
Flags: []cli.Flag{
utils.UnlockedAccountFlag,
utils.PasswordFileFlag,
utils.ExternalSignerFlag,
},
},
{

19
cmd/utils/flags.go
View file

@ -402,7 +402,11 @@ var (
Usage: "Password file to use for non-interactive password input",
Value: "",
}
ExternalSignerFlag = cli.StringFlag{
Name: "signer",
Usage: "External signer (url or path to ipc file)",
Value: "",
}
VMEnableDebugFlag = cli.BoolFlag{
Name: "vmdebug",
Usage: "Record information useful for VM and contract debugging",
@ -880,11 +884,15 @@ func setEtherbase(ctx *cli.Context, ks *keystore.KeyStore, cfg *eth.Config) {
}
// Convert the etherbase into an address and configure it
if etherbase != "" {
if ks != nil {
account, err := MakeAddress(ks, etherbase)
if err != nil {
Fatalf("Invalid miner etherbase: %v", err)
}
cfg.Etherbase = account.Address
}else{
Fatalf("No etherbase configured")
}
}
}
@ -983,6 +991,10 @@ func SetNodeConfig(ctx *cli.Context, cfg *node.Config) {
setDataDir(ctx, cfg)
if ctx.GlobalIsSet( ExternalSignerFlag.Name){
cfg.ExternalSigner = ctx.GlobalString(ExternalSignerFlag.Name)
}
if ctx.GlobalIsSet(KeyStoreDirFlag.Name) {
cfg.KeyStoreDir = ctx.GlobalString(KeyStoreDirFlag.Name)
}
@ -1163,7 +1175,10 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
checkExclusive(ctx, DeveloperFlag, TestnetFlag, RinkebyFlag)
checkExclusive(ctx, LightServFlag, SyncModeFlag, "light")
ks := stack.AccountManager().Backends(keystore.KeyStoreType)[0].(*keystore.KeyStore)
var ks *keystore.KeyStore
if keystores := stack.AccountManager().Backends(keystore.KeyStoreType); len(keystores) > 0{
ks = keystores[0].(*keystore.KeyStore)
}
setEtherbase(ctx, ks, cfg)
setGPO(ctx, &cfg.GPO)
setTxPool(ctx, &cfg.TxPool)

43
consensus/clique/clique.go
View file

@ -36,10 +36,8 @@ import (
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
lru "github.com/hashicorp/golang-lru"
"golang.org/x/crypto/sha3"
)
const (
@ -136,40 +134,9 @@ var (
errRecentlySigned = errors.New("recently signed")
)
// SignerFn is a signer callback function to request a hash to be signed by a
// SignerFn is a signer callback function to request a header to be signed by a
// backing account.
type SignerFn func(accounts.Account, []byte) ([]byte, error)
// sigHash returns the hash which is used as input for the proof-of-authority
// signing. It is the hash of the entire header apart from the 65 byte signature
// contained at the end of the extra data.
//
// Note, the method requires the extra data to be at least 65 bytes, otherwise it
// panics. This is done to avoid accidentally using both forms (signature present
// or not), which could be abused to produce different hashes for the same header.
func sigHash(header *types.Header) (hash common.Hash) {
hasher := sha3.NewLegacyKeccak256()
rlp.Encode(hasher, []interface{}{
header.ParentHash,
header.UncleHash,
header.Coinbase,
header.Root,
header.TxHash,
header.ReceiptHash,
header.Bloom,
header.Difficulty,
header.Number,
header.GasLimit,
header.GasUsed,
header.Time,
header.Extra[:len(header.Extra)-65], // Yes, this will panic if extra is too short
header.MixDigest,
header.Nonce,
})
hasher.Sum(hash[:0])
return hash
}
type SignerFn func(accounts.Account, *types.Header) ([]byte, error)
// ecrecover extracts the Ethereum account address from a signed header.
func ecrecover(header *types.Header, sigcache *lru.ARCCache) (common.Address, error) {
@ -185,7 +152,7 @@ func ecrecover(header *types.Header, sigcache *lru.ARCCache) (common.Address, er
signature := header.Extra[len(header.Extra)-extraSeal:]
// Recover the public key and the Ethereum address
pubkey, err := crypto.Ecrecover(sigHash(header).Bytes(), signature)
pubkey, err := crypto.Ecrecover(accounts.CliqueHash(header).Bytes(), signature)
if err != nil {
return common.Address{}, err
}
@ -646,7 +613,7 @@ func (c *Clique) Seal(chain consensus.ChainReader, block *types.Block, results c
log.Trace("Out-of-turn signing requested", "wiggle", common.PrettyDuration(wiggle))
}
// Sign all the things!
sighash, err := signFn(accounts.Account{Address: signer}, sigHash(header).Bytes())
sighash, err := signFn(accounts.Account{Address: signer}, header)
if err != nil {
return err
}
@ -693,7 +660,7 @@ func CalcDifficulty(snap *Snapshot, signer common.Address) *big.Int {
// SealHash returns the hash of a block prior to it being sealed.
func (c *Clique) SealHash(header *types.Header) common.Hash {
return sigHash(header)
return accounts.CliqueHash(header)
}
// Close implements consensus.Engine. It's a noop for clique as there are no background threads.

2
eth/backend.go
View file

@ -432,7 +432,7 @@ func (s *Ethereum) StartMining(threads int) error {
log.Error("Etherbase account unavailable locally", "err", err)
return fmt.Errorf("signer missing: %v", err)
}
clique.Authorize(eb, wallet.SignHash)
clique.Authorize(eb, wallet.SignCliqueHeader)
}
// If mining is started, we can disable the transaction rejection mechanism
// introduced to speed sync times.

19
internal/ethapi/api.go
View file

@ -217,7 +217,7 @@ func NewPrivateAccountAPI(b Backend, nonceLock *AddrLocker) *PrivateAccountAPI {
}
}
// ListAccounts will return a list of addresses for accounts this node manages.
// listAccounts will return a list of addresses for accounts this node manages.
func (s *PrivateAccountAPI) ListAccounts() []common.Address {
addresses := make([]common.Address, 0) // return [] instead of nil if empty
for _, wallet := range s.am.Wallets() {
@ -409,17 +409,6 @@ func (s *PrivateAccountAPI) SignTransaction(ctx context.Context, args SendTxArgs
return &SignTransactionResult{data, signed}, nil
}
// signHash is a helper function that calculates a hash for the given message that can be
// safely used to calculate a signature from.
//
// The hash is calulcated as
// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
//
// This gives context to the signed message and prevents signing of transactions.
func signHash(data []byte) []byte {
msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
return crypto.Keccak256([]byte(msg))
}
// Sign calculates an Ethereum ECDSA signature for:
// keccack256("\x19Ethereum Signed Message:\n" + len(message) + message))
@ -439,7 +428,7 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
return nil, err
}
// Assemble sign the data with the wallet
signature, err := wallet.SignHashWithPassphrase(account, passwd, signHash(data))
signature, err := wallet.SignTextWithPassphrase(account, passwd, data)
if err != nil {
log.Warn("Failed data sign attempt", "address", addr, "err", err)
return nil, err
@ -467,7 +456,7 @@ func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Byt
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.SigToPub(signHash(data), sig)
rpk, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {
return common.Address{}, err
}
@ -1340,7 +1329,7 @@ func (s *PublicTransactionPoolAPI) Sign(addr common.Address, data hexutil.Bytes)
return nil, err
}
// Sign the requested hash with the wallet
signature, err := wallet.SignHash(account, signHash(data))
signature, err := wallet.SignText(account, data)
if err == nil {
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
}

20
node/config.go
View file

@ -19,6 +19,7 @@ package node
import (
"crypto/ecdsa"
"fmt"
"github.com/ethereum/go-ethereum/accounts/external"
"io/ioutil"
"os"
"path/filepath"
@ -80,6 +81,9 @@ type Config struct {
// is created by New and destroyed when the node is stopped.
KeyStoreDir string `toml:",omitempty"`
// ExternalSigner specifies an external URI for a clef-type signer
ExternalSigner string `toml:"omitempty"`
// UseLightweightKDF lowers the memory and CPU requirements of the key store
// scrypt KDF at the expense of security.
UseLightweightKDF bool `toml:",omitempty"`
@ -430,9 +434,18 @@ func makeAccountManager(conf *Config) (*accounts.Manager, string, error) {
return nil, "", err
}
// Assemble the account manager and supported backends
backends := []accounts.Backend{
keystore.NewKeyStore(keydir, scryptN, scryptP),
backends := []accounts.Backend{}
if len(conf.ExternalSigner) > 0 {
if extapi,err := external.NewExternalBackend(conf.ExternalSigner); err == nil{
backends = append(backends, extapi)
}
}
if len(backends) == 0{
// For now, we're using EITHER external signer OR local signers.
// If/when we implement some form of lockfile for USB and keystore wallets,
// we can have both, but it's very confusing for the user to see the same
// accounts in both externally and locally, plus very racey.
backends = append(backends, keystore.NewKeyStore(keydir, scryptN, scryptP))
if !conf.NoUSB {
// Start a USB hub for Ledger hardware wallets
if ledgerhub, err := usbwallet.NewLedgerHub(); err != nil {
@ -447,6 +460,9 @@ func makeAccountManager(conf *Config) (*accounts.Manager, string, error) {
backends = append(backends, trezorhub)
}
}
}
return accounts.NewManager(backends...), ephemeral, nil
}

2
signer/core/api.go
View file

@ -539,7 +539,7 @@ func (api *SignerAPI) Sign(ctx context.Context, addr common.MixedcaseAddress, da
return nil, err
}
// Assemble sign the data with the wallet
signature, err := wallet.SignHashWithPassphrase(account, res.Password, sighash)
signature, err := wallet.SignTextWithPassphrase(account, res.Password, data)
if err != nil {
api.UI.ShowError(err.Error())
return nil, err