accounts/usbwallet: initial support for Ledger wallets

accounts/usbwallet/ledger_test.go

+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package usbwallet
+
+/*
+func TestLedgerHub(t *testing.T) {
+	glog.SetV(6)
+	glog.SetToStderr(true)
+
+	// Create a USB hub watching for Ledger devices
+	hub, err := NewLedgerHub()
+	if err != nil {
+		t.Fatalf("Failed to create Ledger hub: %v", err)
+	}
+	defer hub.Close()
+
+	// Wait for events :P
+	time.Sleep(time.Minute)
+}
+*/
+/*
+func TestLedger(t *testing.T) {
+	// Create a USB context to access devices through
+	ctx, err := usb.NewContext()
+	defer ctx.Close()
+	ctx.Debug(6)
+
+	// List all of the Ledger wallets
+	wallets, err := findLedgerWallets(ctx)
+	if err != nil {
+		t.Fatalf("Failed to list Ledger wallets: %v", err)
+	}
+	// Retrieve the address from every one of them
+	for _, wallet := range wallets {
+		// Retrieve the version of the wallet app
+		ver, err := wallet.Version()
+		if err != nil {
+			t.Fatalf("Failed to retrieve wallet version: %v", err)
+		}
+		fmt.Printf("Ledger version: %s\n", ver)
+
+		// Retrieve the address of the wallet
+		addr, err := wallet.Address()
+		if err != nil {
+			t.Fatalf("Failed to retrieve wallet address: %v", err)
+		}
+		fmt.Printf("Ledger address: %x\n", addr)
+
+		// Try to sign a transaction with the wallet
+		unsigned := types.NewTransaction(1, common.HexToAddress("0xbabababababababababababababababababababa"), common.Ether, big.NewInt(20000), common.Shannon, nil)
+		signed, err := wallet.Sign(unsigned)
+		if err != nil {
+			t.Fatalf("Failed to sign transactions: %v", err)
+		}
+		signer, err := types.Sender(types.NewEIP155Signer(big.NewInt(1)), signed)
+		if err != nil {
+			t.Fatalf("Failed to recover signer: %v", err)
+		}
+		fmt.Printf("Ledger signature by: %x\n", signer)
+	}
+}*/

accounts/usbwallet/usb.go

+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package usbwallet implements support for USB hardware wallets.
+package usbwallet
+
+import "github.com/karalabe/gousb/usb"
+
+// deviceID is a combined vendor/product identifier to uniquely identify a USB
+// hardware device.
+type deviceID struct {
+	Vendor  usb.ID // The Vendor identifer
+	Product usb.ID // The Product identifier
+}

node/config.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
+	"github.com/ethereum/go-ethereum/accounts/usbwallet"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
@@ -432,6 +433,15 @@ func makeAccountManager(conf *Config) (am *accounts.Manager, ephemeralKeystore s
 	if err := os.MkdirAll(keydir, 0700); err != nil {
 		return nil, "", err
 	}
-	ks := keystore.NewKeyStore(keydir, scryptN, scryptP)
-	return accounts.NewManager(ks), ephemeralKeystore, nil
+
+	// Assemble the account manager and supported backends
+	backends := []accounts.Backend{
+		keystore.NewKeyStore(keydir, scryptN, scryptP),
+	}
+	if ledgerhub, err := usbwallet.NewLedgerHub(); err != nil {
+		glog.V(logger.Warn).Infof("Failed to start Ledger hub, disabling: %v", err)
+	} else {
+		backends = append(backends, ledgerhub)
+	}
+	return accounts.NewManager(backends...), ephemeralKeystore, nil
 }