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649 lines
23 KiB
649 lines
23 KiB
8 years ago
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// Copyright 2017 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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// This file contains the implementation for interacting with the Ledger hardware
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// wallets. The wire protocol spec can be found in the Ledger Blue GitHub repo:
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// https://raw.githubusercontent.com/LedgerHQ/blue-app-eth/master/doc/ethapp.asc
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package usbwallet
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import (
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"encoding/binary"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"math/big"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/karalabe/gousb/usb"
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)
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// ledgerDeviceIDs are the known device IDs that Ledger wallets use.
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var ledgerDeviceIDs = []deviceID{
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{Vendor: 0x2c97, Product: 0x0000}, // Ledger Blue
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{Vendor: 0x2c97, Product: 0x0001}, // Ledger Nano S
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}
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// ledgerDerivationPath is the key derivation parameters used by the wallet.
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var ledgerDerivationPath = [4]uint32{0x80000000 + 44, 0x80000000 + 60, 0x80000000 + 0, 0}
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// ledgerOpcode is an enumeration encoding the supported Ledger opcodes.
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type ledgerOpcode byte
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// ledgerParam1 is an enumeration encoding the supported Ledger parameters for
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// specific opcodes. The same parameter values may be reused between opcodes.
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type ledgerParam1 byte
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// ledgerParam2 is an enumeration encoding the supported Ledger parameters for
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// specific opcodes. The same parameter values may be reused between opcodes.
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type ledgerParam2 byte
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const (
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ledgerOpRetrieveAddress ledgerOpcode = 0x02 // Returns the public key and Ethereum address for a given BIP 32 path
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ledgerOpSignTransaction ledgerOpcode = 0x04 // Signs an Ethereum transaction after having the user validate the parameters
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ledgerOpGetConfiguration ledgerOpcode = 0x06 // Returns specific wallet application configuration
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ledgerP1DirectlyFetchAddress ledgerParam1 = 0x00 // Return address directly from the wallet
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ledgerP1ConfirmFetchAddress ledgerParam1 = 0x01 // Require a user confirmation before returning the address
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ledgerP1InitTransactionData ledgerParam1 = 0x00 // First transaction data block for signing
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ledgerP1ContTransactionData ledgerParam1 = 0x80 // Subsequent transaction data block for signing
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ledgerP2DiscardAddressChainCode ledgerParam2 = 0x00 // Do not return the chain code along with the address
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ledgerP2ReturnAddressChainCode ledgerParam2 = 0x01 // Require a user confirmation before returning the address
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)
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// ledgerWallet represents a live USB Ledger hardware wallet.
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type ledgerWallet struct {
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device *usb.Device // USB device advertising itself as a Ledger wallet
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input usb.Endpoint // Input endpoint to send data to this device
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output usb.Endpoint // Output endpoint to receive data from this device
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address common.Address // Current address of the wallet (may be zero if Ethereum app offline)
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url string // Textual URL uniquely identifying this wallet
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version [3]byte // Current version of the Ledger Ethereum app (zero if app is offline)
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}
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// LedgerHub is a USB hardware wallet interface that can find and handle Ledger
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// wallets.
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type LedgerHub struct {
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ctx *usb.Context // Context interfacing with a libusb instance
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wallets map[uint16]*ledgerWallet // Apparent Ledger wallets (some may be inactive)
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accounts []accounts.Account // List of active Ledger accounts
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index map[common.Address]uint16 // Set of addresses with active wallets
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quit chan chan error
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lock sync.RWMutex
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}
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// NewLedgerHub creates a new hardware wallet manager for Ledger devices.
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func NewLedgerHub() (*LedgerHub, error) {
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// Initialize the USB library to access Ledgers through
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ctx, err := usb.NewContext()
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if err != nil {
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return nil, err
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}
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// Create the USB hub, start and return it
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hub := &LedgerHub{
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ctx: ctx,
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wallets: make(map[uint16]*ledgerWallet),
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index: make(map[common.Address]uint16),
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quit: make(chan chan error),
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}
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go hub.watch()
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return hub, nil
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}
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// Accounts retrieves the live of accounts currently known by the Ledger hub.
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func (hub *LedgerHub) Accounts() []accounts.Account {
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hub.lock.RLock()
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defer hub.lock.RUnlock()
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cpy := make([]accounts.Account, len(hub.accounts))
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copy(cpy, hub.accounts)
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return cpy
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}
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// HasAddress reports whether an account with the given address is present.
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func (hub *LedgerHub) HasAddress(addr common.Address) bool {
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hub.lock.RLock()
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defer hub.lock.RUnlock()
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_, known := hub.index[addr]
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return known
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}
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// SignHash is not supported for Ledger wallets, so this method will always
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// return an error.
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func (hub *LedgerHub) SignHash(acc accounts.Account, hash []byte) ([]byte, error) {
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return nil, accounts.ErrNotSupported
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}
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// SignTx sends the transaction over to the Ledger wallet to request a confirmation
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// from the user. It returns either the signed transaction or a failure if the user
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// denied the transaction.
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//
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// Note, if the version of the Ethereum application running on the Ledger wallet is
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// too old to sign EIP-155 transactions, but such is requested nonetheless, an error
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// will be returned opposed to silently signing in Homestead mode.
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func (hub *LedgerHub) SignTx(acc accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
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hub.lock.RLock()
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defer hub.lock.RUnlock()
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// If the account contains the device URL, flatten it to make sure
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var id uint16
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if acc.URL != "" {
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if parts := strings.Split(acc.URL, "."); len(parts) == 2 {
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bus, busErr := strconv.Atoi(parts[0])
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addr, addrErr := strconv.Atoi(parts[1])
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if busErr == nil && addrErr == nil {
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id = uint16(bus)<<8 + uint16(addr)
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}
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}
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}
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// If the id is still zero, URL is either missing or bad, resolve
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if id == 0 {
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var ok bool
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if id, ok = hub.index[acc.Address]; !ok {
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return nil, accounts.ErrUnknownAccount
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}
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}
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// Retrieve the wallet associated with the URL
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wallet, ok := hub.wallets[id]
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if !ok {
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return nil, accounts.ErrUnknownAccount
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}
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// Ensure the wallet is capable of signing the given transaction
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if chainID != nil && wallet.version[0] <= 1 && wallet.version[1] <= 0 && wallet.version[2] <= 2 {
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return nil, fmt.Errorf("Ledger v%d.%d.%d doesn't support signing this transaction, please update to v1.0.3 at least",
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wallet.version[0], wallet.version[1], wallet.version[2])
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}
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return wallet.sign(tx, chainID)
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}
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// SignHashWithPassphrase is not supported for Ledger wallets, so this method
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// will always return an error.
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func (hub *LedgerHub) SignHashWithPassphrase(acc accounts.Account, passphrase string, hash []byte) ([]byte, error) {
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return nil, accounts.ErrNotSupported
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}
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// SignTxWithPassphrase requests the backend to sign the given transaction, with the
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// given passphrase as extra authentication information. Since the Ledger does not
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// support this feature, it will just silently ignore the passphrase.
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func (hub *LedgerHub) SignTxWithPassphrase(acc accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
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return hub.SignTx(acc, tx, chainID)
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}
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// Close terminates the usb watching for Ledger wallets and returns when it
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// successfully terminated.
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func (hub *LedgerHub) Close() error {
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// Terminate the USB scanner
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errc := make(chan error)
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hub.quit <- errc
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err := <-errc
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// Release the USB interface and return
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hub.ctx.Close()
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return err
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}
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// watch starts watching the local machine's USB ports for the connection or
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// disconnection of Ledger devices.
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func (hub *LedgerHub) watch() {
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for {
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// Rescan the USB ports for devices newly added or removed
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hub.rescan()
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// Sleep for a certain amount of time or until terminated
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select {
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case errc := <-hub.quit:
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errc <- nil
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return
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case <-time.After(time.Second):
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}
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}
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}
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// rescan searches the USB ports for attached Ledger hardware wallets.
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func (hub *LedgerHub) rescan() {
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hub.lock.Lock()
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defer hub.lock.Unlock()
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// Iterate over all attached devices and fetch those seemingly Ledger
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present := make(map[uint16]bool)
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devices, _ := hub.ctx.ListDevices(func(desc *usb.Descriptor) bool {
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// Discard all devices not advertizing as Ledger
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ledger := false
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for _, id := range ledgerDeviceIDs {
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if desc.Vendor == id.Vendor && desc.Product == id.Product {
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ledger = true
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}
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}
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if !ledger {
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return false
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}
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// If we have a Ledger, mark as still present, or open as new
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id := uint16(desc.Bus)<<8 + uint16(desc.Address)
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if _, known := hub.wallets[id]; known {
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// Track it's presence, but don't open again
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present[id] = true
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return false
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}
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// New Ledger device, open it for communication
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return true
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})
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// Drop any tracker wallet which disconnected
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for id, wallet := range hub.wallets {
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if !present[id] {
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if wallet.address == (common.Address{}) {
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glog.V(logger.Info).Infof("ledger wallet [%03d.%03d] disconnected", wallet.device.Bus, wallet.device.Address)
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} else {
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// A live account disconnected, remove it from the tracked accounts
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for i, account := range hub.accounts {
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if account.Address == wallet.address && account.URL == wallet.url {
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hub.accounts = append(hub.accounts[:i], hub.accounts[i+1:]...)
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break
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}
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}
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delete(hub.index, wallet.address)
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glog.V(logger.Info).Infof("ledger wallet [%03d.%03d] v%d.%d.%d disconnected: %s", wallet.device.Bus, wallet.device.Address,
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wallet.version[0], wallet.version[1], wallet.version[2], wallet.address.Hex())
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}
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delete(hub.wallets, id)
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wallet.device.Close()
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}
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}
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// Start tracking all wallets which newly appeared
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var err error
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for _, device := range devices {
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// Make sure the alleged device has the correct IO endpoints
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wallet := &ledgerWallet{
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device: device,
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url: fmt.Sprintf("%03d.%03d", device.Bus, device.Address),
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}
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var invalid string
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switch {
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case len(device.Descriptor.Configs) == 0:
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invalid = "no endpoint config available"
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case len(device.Descriptor.Configs[0].Interfaces) == 0:
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invalid = "no endpoint interface available"
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case len(device.Descriptor.Configs[0].Interfaces[0].Setups) == 0:
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invalid = "no endpoint setup available"
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case len(device.Descriptor.Configs[0].Interfaces[0].Setups[0].Endpoints) < 2:
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invalid = "not enough IO endpoints available"
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}
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if invalid != "" {
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glog.V(logger.Debug).Infof("ledger wallet [%s] deemed invalid: %s", wallet.url, invalid)
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device.Close()
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continue
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}
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// Open the input and output endpoints to the device
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wallet.input, err = device.OpenEndpoint(
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device.Descriptor.Configs[0].Config,
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device.Descriptor.Configs[0].Interfaces[0].Number,
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device.Descriptor.Configs[0].Interfaces[0].Setups[0].Number,
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device.Descriptor.Configs[0].Interfaces[0].Setups[0].Endpoints[1].Address,
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)
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if err != nil {
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glog.V(logger.Debug).Infof("ledger wallet [%s] input open failed: %v", wallet.url, err)
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device.Close()
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continue
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}
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wallet.output, err = device.OpenEndpoint(
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device.Descriptor.Configs[0].Config,
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device.Descriptor.Configs[0].Interfaces[0].Number,
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device.Descriptor.Configs[0].Interfaces[0].Setups[0].Number,
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device.Descriptor.Configs[0].Interfaces[0].Setups[0].Endpoints[0].Address,
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)
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if err != nil {
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glog.V(logger.Debug).Infof("ledger wallet [%s] output open failed: %v", wallet.url, err)
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device.Close()
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continue
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}
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// Start tracking the device as a probably Ledger wallet
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id := uint16(device.Bus)<<8 + uint16(device.Address)
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hub.wallets[id] = wallet
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if wallet.resolveVersion() != nil || wallet.resolveAddress() != nil {
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glog.V(logger.Info).Infof("ledger wallet [%s] connected, Ethereum app not started", wallet.url)
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} else {
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hub.accounts = append(hub.accounts, accounts.Account{
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Address: wallet.address,
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URL: wallet.url,
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})
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hub.index[wallet.address] = id
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glog.V(logger.Info).Infof("ledger wallet [%s] v%d.%d.%d connected: %s", wallet.url,
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wallet.version[0], wallet.version[1], wallet.version[2], wallet.address.Hex())
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}
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}
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}
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|
|
// resolveVersion retrieves the current version of the Ethereum wallet app running
|
||
|
|
// on the Ledger wallet and caches it for future reference.
|
||
|
|
//
|
||
|
|
// The version retrieval protocol is defined as follows:
|
||
|
|
//
|
||
|
|
// CLA | INS | P1 | P2 | Lc | Le
|
||
|
|
// ----+-----+----+----+----+---
|
||
|
|
// E0 | 06 | 00 | 00 | 00 | 04
|
||
|
|
//
|
||
|
|
// With no input data, and the output data being:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// ---------------------------------------------------+--------
|
||
|
|
// Flags 01: arbitrary data signature enabled by user | 1 byte
|
||
|
|
// Application major version | 1 byte
|
||
|
|
// Application minor version | 1 byte
|
||
|
|
// Application patch version | 1 byte
|
||
|
|
func (wallet *ledgerWallet) resolveVersion() error {
|
||
|
|
// Send the request and wait for the response
|
||
|
|
reply, err := wallet.exchange(ledgerOpGetConfiguration, 0, 0, nil)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if len(reply) != 4 {
|
||
|
|
return errors.New("reply not of correct size")
|
||
|
|
}
|
||
|
|
// Cache the version for future reference
|
||
|
|
copy(wallet.version[:], reply[1:])
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// resolveAddress retrieves the currently active Ethereum address from a Ledger
|
||
|
|
// wallet and caches it for future reference.
|
||
|
|
//
|
||
|
|
// The address derivation protocol is defined as follows:
|
||
|
|
//
|
||
|
|
// CLA | INS | P1 | P2 | Lc | Le
|
||
|
|
// ----+-----+----+----+-----+---
|
||
|
|
// E0 | 02 | 00 return address
|
||
|
|
// 01 display address and confirm before returning
|
||
|
|
// | 00: do not return the chain code
|
||
|
|
// | 01: return the chain code
|
||
|
|
// | var | 00
|
||
|
|
//
|
||
|
|
// Where the input data is:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// -------------------------------------------------+--------
|
||
|
|
// Number of BIP 32 derivations to perform (max 10) | 1 byte
|
||
|
|
// First derivation index (big endian) | 4 bytes
|
||
|
|
// ... | 4 bytes
|
||
|
|
// Last derivation index (big endian) | 4 bytes
|
||
|
|
//
|
||
|
|
// And the output data is:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// ------------------------+-------------------
|
||
|
|
// Public Key length | 1 byte
|
||
|
|
// Uncompressed Public Key | arbitrary
|
||
|
|
// Ethereum address length | 1 byte
|
||
|
|
// Ethereum address | 40 bytes hex ascii
|
||
|
|
// Chain code if requested | 32 bytes
|
||
|
|
func (wallet *ledgerWallet) resolveAddress() error {
|
||
|
|
// Flatten the derivation path into the Ledger request
|
||
|
|
path := make([]byte, 1+4*len(ledgerDerivationPath))
|
||
|
|
path[0] = byte(len(ledgerDerivationPath))
|
||
|
|
for i, component := range ledgerDerivationPath {
|
||
|
|
binary.BigEndian.PutUint32(path[1+4*i:], component)
|
||
|
|
}
|
||
|
|
// Send the request and wait for the response
|
||
|
|
reply, err := wallet.exchange(ledgerOpRetrieveAddress, ledgerP1DirectlyFetchAddress, ledgerP2DiscardAddressChainCode, path)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
// Discard the public key, we don't need that for now
|
||
|
|
if len(reply) < 1 || len(reply) < 1+int(reply[0]) {
|
||
|
|
return errors.New("reply lacks public key entry")
|
||
|
|
}
|
||
|
|
reply = reply[1+int(reply[0]):]
|
||
|
|
|
||
|
|
// Extract the Ethereum hex address string
|
||
|
|
if len(reply) < 1 || len(reply) < 1+int(reply[0]) {
|
||
|
|
return errors.New("reply lacks address entry")
|
||
|
|
}
|
||
|
|
hexstr := reply[1 : 1+int(reply[0])]
|
||
|
|
|
||
|
|
// Decode the hex sting into an Ethereum address and return
|
||
|
|
hex.Decode(wallet.address[:], hexstr)
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// sign sends the transaction to the Ledger wallet, and waits for the user to
|
||
|
|
// confirm or deny the transaction.
|
||
|
|
//
|
||
|
|
// The transaction signing protocol is defined as follows:
|
||
|
|
//
|
||
|
|
// CLA | INS | P1 | P2 | Lc | Le
|
||
|
|
// ----+-----+----+----+-----+---
|
||
|
|
// E0 | 04 | 00: first transaction data block
|
||
|
|
// 80: subsequent transaction data block
|
||
|
|
// | 00 | variable | variable
|
||
|
|
//
|
||
|
|
// Where the input for the first transaction block (first 255 bytes) is:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// -------------------------------------------------+----------
|
||
|
|
// Number of BIP 32 derivations to perform (max 10) | 1 byte
|
||
|
|
// First derivation index (big endian) | 4 bytes
|
||
|
|
// ... | 4 bytes
|
||
|
|
// Last derivation index (big endian) | 4 bytes
|
||
|
|
// RLP transaction chunk | arbitrary
|
||
|
|
//
|
||
|
|
// And the input for subsequent transaction blocks (first 255 bytes) are:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// ----------------------+----------
|
||
|
|
// RLP transaction chunk | arbitrary
|
||
|
|
//
|
||
|
|
// And the output data is:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// ------------+---------
|
||
|
|
// signature V | 1 byte
|
||
|
|
// signature R | 32 bytes
|
||
|
|
// signature S | 32 bytes
|
||
|
|
func (wallet *ledgerWallet) sign(tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
|
||
|
|
// We need to modify the timeouts to account for user feedback
|
||
|
|
defer func(old time.Duration) { wallet.device.ReadTimeout = old }(wallet.device.ReadTimeout)
|
||
|
|
wallet.device.ReadTimeout = time.Minute
|
||
|
|
|
||
|
|
// Flatten the derivation path into the Ledger request
|
||
|
|
path := make([]byte, 1+4*len(ledgerDerivationPath))
|
||
|
|
path[0] = byte(len(ledgerDerivationPath))
|
||
|
|
for i, component := range ledgerDerivationPath {
|
||
|
|
binary.BigEndian.PutUint32(path[1+4*i:], component)
|
||
|
|
}
|
||
|
|
// Create the transaction RLP based on whether legacy or EIP155 signing was requeste
|
||
|
|
var (
|
||
|
|
txrlp []byte
|
||
|
|
err error
|
||
|
|
)
|
||
|
|
if chainID == nil {
|
||
|
|
if txrlp, err = rlp.EncodeToBytes([]interface{}{tx.Nonce(), tx.GasPrice(), tx.Gas(), tx.To(), tx.Value(), tx.Data()}); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if txrlp, err = rlp.EncodeToBytes([]interface{}{tx.Nonce(), tx.GasPrice(), tx.Gas(), tx.To(), tx.Value(), tx.Data(), chainID, big.NewInt(0), big.NewInt(0)}); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
payload := append(path, txrlp...)
|
||
|
|
|
||
|
|
// Send the request and wait for the response
|
||
|
|
var (
|
||
|
|
op = ledgerP1InitTransactionData
|
||
|
|
reply []byte
|
||
|
|
)
|
||
|
|
for len(payload) > 0 {
|
||
|
|
// Calculate the size of the next data chunk
|
||
|
|
chunk := 255
|
||
|
|
if chunk > len(payload) {
|
||
|
|
chunk = len(payload)
|
||
|
|
}
|
||
|
|
// Send the chunk over, ensuring it's processed correctly
|
||
|
|
reply, err = wallet.exchange(ledgerOpSignTransaction, op, 0, payload[:chunk])
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
// Shift the payload and ensure subsequent chunks are marked as such
|
||
|
|
payload = payload[chunk:]
|
||
|
|
op = ledgerP1ContTransactionData
|
||
|
|
}
|
||
|
|
// Extract the Ethereum signature and do a sanity validation
|
||
|
|
if len(reply) != 65 {
|
||
|
|
return nil, errors.New("reply lacks signature")
|
||
|
|
}
|
||
|
|
signature := append(reply[1:], reply[0])
|
||
|
|
|
||
|
|
// Create the correct signer and signature transform based on the chain ID
|
||
|
|
var signer types.Signer
|
||
|
|
if chainID == nil {
|
||
|
|
signer = new(types.HomesteadSigner)
|
||
|
|
} else {
|
||
|
|
signer = types.NewEIP155Signer(chainID)
|
||
|
|
signature[64] = (signature[64]-34)/2 - byte(chainID.Uint64())
|
||
|
|
}
|
||
|
|
// Inject the final signature into the transaction and sanity check the sender
|
||
|
|
signed, err := tx.WithSignature(signer, signature)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
sender, err := types.Sender(signer, signed)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if sender != wallet.address {
|
||
|
|
glog.V(logger.Error).Infof("Ledger signer mismatch: expected %s, got %s", wallet.address.Hex(), sender.Hex())
|
||
|
|
return nil, fmt.Errorf("signer mismatch: expected %s, got %s", wallet.address.Hex(), sender.Hex())
|
||
|
|
}
|
||
|
|
return signed, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// exchange performs a data exchange with the Ledger wallet, sending it a message
|
||
|
|
// and retrieving the response.
|
||
|
|
//
|
||
|
|
// The common transport header is defined as follows:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// --------------------------------------+----------
|
||
|
|
// Communication channel ID (big endian) | 2 bytes
|
||
|
|
// Command tag | 1 byte
|
||
|
|
// Packet sequence index (big endian) | 2 bytes
|
||
|
|
// Payload | arbitrary
|
||
|
|
//
|
||
|
|
// The Communication channel ID allows commands multiplexing over the same
|
||
|
|
// physical link. It is not used for the time being, and should be set to 0101
|
||
|
|
// to avoid compatibility issues with implementations ignoring a leading 00 byte.
|
||
|
|
//
|
||
|
|
// The Command tag describes the message content. Use TAG_APDU (0x05) for standard
|
||
|
|
// APDU payloads, or TAG_PING (0x02) for a simple link test.
|
||
|
|
//
|
||
|
|
// The Packet sequence index describes the current sequence for fragmented payloads.
|
||
|
|
// The first fragment index is 0x00.
|
||
|
|
//
|
||
|
|
// APDU Command payloads are encoded as follows:
|
||
|
|
//
|
||
|
|
// Description | Length
|
||
|
|
// -----------------------------------
|
||
|
|
// APDU length (big endian) | 2 bytes
|
||
|
|
// APDU CLA | 1 byte
|
||
|
|
// APDU INS | 1 byte
|
||
|
|
// APDU P1 | 1 byte
|
||
|
|
// APDU P2 | 1 byte
|
||
|
|
// APDU length | 1 byte
|
||
|
|
// Optional APDU data | arbitrary
|
||
|
|
func (wallet *ledgerWallet) exchange(opcode ledgerOpcode, p1 ledgerParam1, p2 ledgerParam2, data []byte) ([]byte, error) {
|
||
|
|
// Construct the message payload, possibly split into multiple chunks
|
||
|
|
var chunks [][]byte
|
||
|
|
for left := data; len(left) > 0 || len(chunks) == 0; {
|
||
|
|
// Create the chunk header
|
||
|
|
var chunk []byte
|
||
|
|
|
||
|
|
if len(chunks) == 0 {
|
||
|
|
// The first chunk encodes the length and all the opcodes
|
||
|
|
chunk = []byte{0x00, 0x00, 0xe0, byte(opcode), byte(p1), byte(p2), byte(len(data))}
|
||
|
|
binary.BigEndian.PutUint16(chunk, uint16(5+len(data)))
|
||
|
|
}
|
||
|
|
// Append the data blob to the end of the chunk
|
||
|
|
space := 64 - len(chunk) - 5 // 5 == header size
|
||
|
|
if len(left) > space {
|
||
|
|
chunks, left = append(chunks, append(chunk, left[:space]...)), left[space:]
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
chunks, left = append(chunks, append(chunk, left...)), nil
|
||
|
|
}
|
||
|
|
// Stream all the chunks to the device
|
||
|
|
for i, chunk := range chunks {
|
||
|
|
// Construct the new message to stream
|
||
|
|
header := []byte{0x01, 0x01, 0x05, 0x00, 0x00} // Channel ID and command tag appended
|
||
|
|
binary.BigEndian.PutUint16(header[3:], uint16(i))
|
||
|
|
|
||
|
|
msg := append(header, chunk...)
|
||
|
|
|
||
|
|
// Send over to the device
|
||
|
|
if glog.V(logger.Core) {
|
||
|
|
glog.Infof("-> %03d.%03d: %x", wallet.device.Bus, wallet.device.Address, msg)
|
||
|
|
}
|
||
|
|
if _, err := wallet.input.Write(msg); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Stream the reply back from the wallet in 64 byte chunks
|
||
|
|
var reply []byte
|
||
|
|
for {
|
||
|
|
// Read the next chunk from the Ledger wallet
|
||
|
|
chunk := make([]byte, 64)
|
||
|
|
if _, err := io.ReadFull(wallet.output, chunk); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if glog.V(logger.Core) {
|
||
|
|
glog.Infof("<- %03d.%03d: %x", wallet.device.Bus, wallet.device.Address, chunk)
|
||
|
|
}
|
||
|
|
// Make sure the transport header matches
|
||
|
|
if chunk[0] != 0x01 || chunk[1] != 0x01 || chunk[2] != 0x05 {
|
||
|
|
return nil, fmt.Errorf("invalid reply header: %x", chunk[:3])
|
||
|
|
}
|
||
|
|
// If it's the first chunk, retrieve the total message length
|
||
|
|
if chunk[3] == 0x00 && chunk[4] == 0x00 {
|
||
|
|
reply = make([]byte, 0, int(binary.BigEndian.Uint16(chunk[5:7])))
|
||
|
|
chunk = chunk[7:]
|
||
|
|
} else {
|
||
|
|
chunk = chunk[5:]
|
||
|
|
}
|
||
|
|
// Append to the reply and stop when filled up
|
||
|
|
if left := cap(reply) - len(reply); left > len(chunk) {
|
||
|
|
reply = append(reply, chunk...)
|
||
|
|
} else {
|
||
|
|
reply = append(reply, chunk[:left]...)
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return reply[:len(reply)-2], nil
|
||
|
|
}
|