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accounts, console: frendly card errors, support pin unblock

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This commit is contained in:
Péter Szilágyi 2018-04-20 10:37:45 +03:00 committed by Guillaume Ballet
parent 386943943f
commit 7d5886dcf4
6 changed files with 169 additions and 112 deletions
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26
accounts/scwallet/apdu.go
View File

@ -21,29 +21,15 @@ import (
"encoding/binary"
)
const (
claISO7816 = 0
insSelect = 0xA4
insGetResponse = 0xC0
insPair = 0x12
insUnpair = 0x13
insOpenSecureChannel = 0x10
insMutuallyAuthenticate = 0x11
sw1GetResponse = 0x61
sw1Ok = 0x90
)
// CommandAPDU represents an application data unit sent to a smartcard.
type CommandAPDU struct {
// commandAPDU represents an application data unit sent to a smartcard.
type commandAPDU struct {
Cla, Ins, P1, P2 uint8 // Class, Instruction, Parameter 1, Parameter 2
Data []byte // Command data
Le uint8 // Command data length
}
// serialize serializes a command APDU.
func (ca CommandAPDU) serialize() ([]byte, error) {
func (ca commandAPDU) serialize() ([]byte, error) {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.BigEndian, ca.Cla); err != nil {
@ -72,14 +58,14 @@ func (ca CommandAPDU) serialize() ([]byte, error) {
return buf.Bytes(), nil
}
// ResponseAPDU represents an application data unit received from a smart card.
type ResponseAPDU struct {
// responseAPDU represents an application data unit received from a smart card.
type responseAPDU struct {
Data []byte // response data
Sw1, Sw2 uint8 // status words 1 and 2
}
// deserialize deserializes a response APDU.
func (ra *ResponseAPDU) deserialize(data []byte) error {
func (ra *responseAPDU) deserialize(data []byte) error {
ra.Data = make([]byte, len(data)-2)
buf := bytes.NewReader(data)

13
accounts/scwallet/hub.go
View File

@ -36,6 +36,7 @@ import (
"encoding/json"
"io/ioutil"
"os"
"sort"
"sync"
"time"
@ -51,7 +52,7 @@ const Scheme = "pcsc"
// refreshCycle is the maximum time between wallet refreshes (if USB hotplug
// notifications don't work).
const refreshCycle = 5 * time.Second
const refreshCycle = time.Second
// refreshThrottling is the minimum time between wallet refreshes to avoid thrashing.
const refreshThrottling = 500 * time.Millisecond
@ -132,7 +133,7 @@ func (hub *Hub) writePairings() error {
return pairingFile.Close()
}
func (hub *Hub) getPairing(wallet *Wallet) *smartcardPairing {
func (hub *Hub) pairing(wallet *Wallet) *smartcardPairing {
pairing, ok := hub.pairings[string(wallet.PublicKey)]
if ok {
return &pairing
@ -182,13 +183,7 @@ func (hub *Hub) Wallets() []accounts.Wallet {
for _, wallet := range hub.wallets {
cpy = append(cpy, wallet)
}
for i := 0; i < len(cpy); i++ {
for j := i + 1; j < len(cpy); j++ {
if cpy[i].URL().Cmp(cpy[j].URL()) > 0 {
cpy[i], cpy[j] = cpy[j], cpy[i]
}
}
}
sort.Sort(accounts.WalletsByURL(cpy))
return cpy
}

24
accounts/scwallet/securechannel.go
View File

@ -17,7 +17,6 @@
package scwallet
import (
//"crypto/ecdsa"
"bytes"
"crypto/aes"
"crypto/cipher"
@ -25,10 +24,10 @@ import (
"crypto/sha256"
"crypto/sha512"
"fmt"
//"math/big"
"github.com/ebfe/scard"
"github.com/ethereum/go-ethereum/crypto"
ecdh "github.com/wsddn/go-ecdh"
"github.com/wsddn/go-ecdh"
)
const (
@ -38,6 +37,11 @@ const (
scSecretLength = 32
scBlockSize = 16
insOpenSecureChannel = 0x10
insMutuallyAuthenticate = 0x11
insPair = 0x12
insUnpair = 0x13
)
// SecureChannelSession enables secure communication with a hardware wallet.
@ -192,8 +196,8 @@ func (s *SecureChannelSession) mutuallyAuthenticate() error {
}
// open is an internal method that sends an open APDU.
func (s *SecureChannelSession) open() (*ResponseAPDU, error) {
return transmit(s.card, &CommandAPDU{
func (s *SecureChannelSession) open() (*responseAPDU, error) {
return transmit(s.card, &commandAPDU{
Cla: claSCWallet,
Ins: insOpenSecureChannel,
P1: s.PairingIndex,
@ -204,8 +208,8 @@ func (s *SecureChannelSession) open() (*ResponseAPDU, error) {
}
// pair is an internal method that sends a pair APDU.
func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*ResponseAPDU, error) {
return transmit(s.card, &CommandAPDU{
func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*responseAPDU, error) {
return transmit(s.card, &commandAPDU{
Cla: claSCWallet,
Ins: insPair,
P1: p1,
@ -216,7 +220,7 @@ func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*ResponseAPDU, error
}
// TransmitEncrypted sends an encrypted message, and decrypts and returns the response.
func (s *SecureChannelSession) TransmitEncrypted(cla, ins, p1, p2 byte, data []byte) (*ResponseAPDU, error) {
func (s *SecureChannelSession) TransmitEncrypted(cla, ins, p1, p2 byte, data []byte) (*responseAPDU, error) {
if s.iv == nil {
return nil, fmt.Errorf("Channel not open")
}
@ -234,7 +238,7 @@ func (s *SecureChannelSession) TransmitEncrypted(cla, ins, p1, p2 byte, data []b
copy(fulldata, s.iv)
copy(fulldata[len(s.iv):], data)
response, err := transmit(s.card, &CommandAPDU{
response, err := transmit(s.card, &commandAPDU{
Cla: cla,
Ins: ins,
P1: p1,
@ -260,7 +264,7 @@ func (s *SecureChannelSession) TransmitEncrypted(cla, ins, p1, p2 byte, data []b
return nil, fmt.Errorf("Invalid MAC in response")
}
rapdu := &ResponseAPDU{}
rapdu := &responseAPDU{}
rapdu.deserialize(plainData)
if rapdu.Sw1 != sw1Ok {

169
accounts/scwallet/wallet.go
View File

@ -27,6 +27,7 @@ import (
"errors"
"fmt"
"math/big"
"sort"
"strings"
"sync"
"time"
@ -51,6 +52,12 @@ var ErrPUKNeeded = errors.New("smartcard: puk needed")
// and send it back.
var ErrPINNeeded = errors.New("smartcard: pin needed")
// ErrPINUnblockNeeded is returned if opening the smart card requires a PIN code,
// but all PIN attempts have already been exhausted. In this case the calling
// application should request user input for the PUK and a new PIN code to set
// fo the card.
var ErrPINUnblockNeeded = errors.New("smartcard: pin unblock needed")
// ErrAlreadyOpen is returned if the smart card is attempted to be opened, but
// there is already a paired and unlocked session.
var ErrAlreadyOpen = errors.New("smartcard: already open")
@ -65,8 +72,16 @@ var (
)
const (
claSCWallet = 0x80
claISO7816 = 0
claSCWallet = 0x80
insSelect = 0xA4
insGetResponse = 0xC0
sw1GetResponse = 0x61
sw1Ok = 0x90
insVerifyPin = 0x20
insUnblockPin = 0x22
insExportKey = 0xC2
insSign = 0xC0
insLoadKey = 0xD0
@ -117,7 +132,7 @@ func NewWallet(hub *Hub, card *scard.Card) *Wallet {
// transmit sends an APDU to the smartcard and receives and decodes the response.
// It automatically handles requests by the card to fetch the return data separately,
// and returns an error if the response status code is not success.
func transmit(card *scard.Card, command *CommandAPDU) (*ResponseAPDU, error) {
func transmit(card *scard.Card, command *commandAPDU) (*responseAPDU, error) {
data, err := command.serialize()
if err != nil {
return nil, err
@ -128,14 +143,14 @@ func transmit(card *scard.Card, command *CommandAPDU) (*ResponseAPDU, error) {
return nil, err
}
response := new(ResponseAPDU)
response := new(responseAPDU)
if err = response.deserialize(responseData); err != nil {
return nil, err
}
// Are we being asked to fetch the response separately?
if response.Sw1 == sw1GetResponse && (command.Cla != claISO7816 || command.Ins != insGetResponse) {
return transmit(card, &CommandAPDU{
return transmit(card, &commandAPDU{
Cla: claISO7816,
Ins: insGetResponse,
P1: 0,
@ -186,7 +201,7 @@ func (w *Wallet) connect() error {
// doselect is an internal (unlocked) function to send a SELECT APDU to the card.
func (w *Wallet) doselect() (*applicationInfo, error) {
response, err := transmit(w.card, &CommandAPDU{
response, err := transmit(w.card, &commandAPDU{
Cla: claISO7816,
Ins: insSelect,
P1: 4,
@ -209,13 +224,11 @@ func (w *Wallet) ping() error {
w.lock.Lock()
defer w.lock.Unlock()
// We can't ping if not paired
if !w.session.paired() {
// We can't ping if not paired
return nil
}
_, err := w.session.getWalletStatus()
if err != nil {
if _, err := w.session.walletStatus(); err != nil {
return err
}
return nil
@ -235,16 +248,13 @@ func (w *Wallet) pair(puk []byte) error {
if w.session.paired() {
return fmt.Errorf("Wallet already paired")
}
pairing, err := w.session.pair(puk)
if err != nil {
return err
}
if err = w.Hub.setPairing(w, &pairing); err != nil {
return err
}
return w.session.authenticate(pairing)
}
@ -285,19 +295,26 @@ func (w *Wallet) Status() (string, error) {
w.lock.Lock()
defer w.lock.Unlock()
// If the card is not paired, we can only wait
if !w.session.paired() {
return "Unpaired", nil
return "Unpaired, waiting for PUK", nil
}
status, err := w.session.getWalletStatus()
// Yay, we have an encrypted session, retrieve the actual status
status, err := w.session.walletStatus()
if err != nil {
return "Error", err
return fmt.Sprintf("Failed: %v", err), err
}
if w.session.verified {
return fmt.Sprintf("Open, %s", status), nil
} else {
return fmt.Sprintf("Locked, %s", status), nil
switch {
case !w.session.verified && status.PinRetryCount == 0:
return fmt.Sprintf("Blocked, waiting for PUK and new PIN"), nil
case !w.session.verified:
return fmt.Sprintf("Locked, waiting for PIN (%d attempts left)", status.PinRetryCount), nil
case !status.Initialized:
return fmt.Sprintf("Empty, waiting for initialization"), nil
case status.SupportsPKDerivation:
return fmt.Sprintf("Online, can derive public keys"), nil
default:
return fmt.Sprintf("Online, cannot derive public keys"), nil
}
}
@ -324,29 +341,46 @@ func (w *Wallet) Open(passphrase string) error {
// pairing key or form the supplied PUK code.
if !w.session.paired() {
// If a previous pairing exists, only ever try to use that
if pairing := w.Hub.getPairing(w); pairing != nil {
if pairing := w.Hub.pairing(w); pairing != nil {
if err := w.session.authenticate(*pairing); err != nil {
return fmt.Errorf("failed to authenticate card %x: %s", w.PublicKey[:4], err)
}
return ErrPINNeeded
// Pairing still ok, fall through to PIN checks
} else {
// If no passphrase was supplied, request the PUK from the user
if passphrase == "" {
return ErrPUKNeeded
}
// Attempt to pair the smart card with the user supplied PUK
if err := w.pair([]byte(passphrase)); err != nil {
return err
}
// Pairing succeeded, fall through to PIN checks. This will of course fail,
// but we can't return ErrPINNeeded directly here becase we don't know whether
// a PIN check or a PIN reset is needed.
passphrase = ""
}
// If no passphrase was supplied, request the PUK from the user
if passphrase == "" {
return ErrPUKNeeded
}
// Attempt to pair the smart card with the user supplied PUK
if err := w.pair([]byte(passphrase)); err != nil {
}
// The smart card was successfully paired, retrieve its status to check whether
// PIN verification or unblocking is needed.
status, err := w.session.walletStatus()
if err != nil {
return err
}
// Request the appropriate next authentication data, or use the one supplied
switch {
case passphrase == "" && status.PinRetryCount > 0:
return ErrPINNeeded
case passphrase == "":
return ErrPINUnblockNeeded
case status.PinRetryCount > 0:
if err := w.session.verifyPin([]byte(passphrase)); err != nil {
return err
}
default:
if err := w.session.unblockPin([]byte(passphrase)); err != nil {
return err
}
return ErrPINNeeded // We always need the PIN after the PUK
}
// The smart card was successfully paired, request a PIN code or use the one
// supplied by the user
if passphrase == "" {
return ErrPINNeeded
}
if err := w.session.verifyPin([]byte(passphrase)); err != nil {
return err
}
// Smart card paired and unlocked, initialize and register
w.deriveReq = make(chan chan struct{})
@ -415,7 +449,7 @@ func (w *Wallet) selfDerive() {
reqc <- struct{}{}
continue
}
pairing := w.Hub.getPairing(w)
pairing := w.Hub.pairing(w)
// Device lock obtained, derive the next batch of accounts
var (
@ -519,18 +553,12 @@ func (w *Wallet) Accounts() []accounts.Account {
w.lock.Lock()
defer w.lock.Unlock()
if pairing := w.Hub.getPairing(w); pairing != nil {
if pairing := w.Hub.pairing(w); pairing != nil {
ret := make([]accounts.Account, 0, len(pairing.Accounts))
for address, path := range pairing.Accounts {
ret = append(ret, w.makeAccount(address, path))
}
for i := 0; i < len(ret); i++ {
for j := i + 1; j < len(ret); j++ {
if ret[i].URL.Cmp(ret[j].URL) > 0 {
ret[i], ret[j] = ret[j], ret[i]
}
}
}
sort.Sort(accounts.AccountsByURL(ret))
return ret
}
return nil
@ -548,7 +576,7 @@ func (w *Wallet) makeAccount(address common.Address, path accounts.DerivationPat
// Contains returns whether an account is part of this particular wallet or not.
func (w *Wallet) Contains(account accounts.Account) bool {
if pairing := w.Hub.getPairing(w); pairing != nil {
if pairing := w.Hub.pairing(w); pairing != nil {
_, ok := pairing.Accounts[account.Address]
return ok
}
@ -576,7 +604,7 @@ func (w *Wallet) Derive(path accounts.DerivationPath, pin bool) (accounts.Accoun
}
if pin {
pairing := w.Hub.getPairing(w)
pairing := w.Hub.pairing(w)
pairing.Accounts[account.Address] = path
if err := w.Hub.setPairing(w, pairing); err != nil {
return accounts.Account{}, err
@ -684,7 +712,7 @@ func (w *Wallet) SignTxWithPassphrase(account accounts.Account, passphrase strin
// It first checks for the address in the list of pinned accounts, and if it is
// not found, attempts to parse the derivation path from the account's URL.
func (w *Wallet) findAccountPath(account accounts.Account) (accounts.DerivationPath, error) {
pairing := w.Hub.getPairing(w)
pairing := w.Hub.pairing(w)
if path, ok := pairing.Accounts[account.Address]; ok {
return path, nil
}
@ -745,6 +773,16 @@ func (s *Session) verifyPin(pin []byte) error {
return nil
}
// unblockPin unblocks a wallet with the provided puk and resets the pin to the
// new one specified.
func (s *Session) unblockPin(pukpin []byte) error {
if _, err := s.Channel.TransmitEncrypted(claSCWallet, insUnblockPin, 0, 0, pukpin); err != nil {
return err
}
s.verified = true
return nil
}
// release releases resources associated with the channel.
func (s *Session) release() error {
return s.Wallet.card.Disconnect(scard.LeaveCard)
@ -773,32 +811,25 @@ type walletStatus struct {
SupportsPKDerivation bool // Whether the card supports doing public key derivation itself
}
func (w walletStatus) String() string {
return fmt.Sprintf("pinRetryCount=%d, pukRetryCount=%d, initialized=%t, supportsPkDerivation=%t", w.PinRetryCount, w.PukRetryCount, w.Initialized, w.SupportsPKDerivation)
}
// getWalletStatus fetches the wallet's status from the card.
func (s *Session) getWalletStatus() (*walletStatus, error) {
// walletStatus fetches the wallet's status from the card.
func (s *Session) walletStatus() (*walletStatus, error) {
response, err := s.Channel.TransmitEncrypted(claSCWallet, insStatus, statusP1WalletStatus, 0, nil)
if err != nil {
return nil, err
}
status := new(walletStatus)
if _, err := asn1.UnmarshalWithParams(response.Data, status, "tag:3"); err != nil {
return nil, err
}
return status, nil
}
// getDerivationPath fetches the wallet's current derivation path from the card.
func (s *Session) getDerivationPath() (accounts.DerivationPath, error) {
// derivationPath fetches the wallet's current derivation path from the card.
func (s *Session) derivationPath() (accounts.DerivationPath, error) {
response, err := s.Channel.TransmitEncrypted(claSCWallet, insStatus, statusP1Path, 0, nil)
if err != nil {
return nil, err
}
buf := bytes.NewReader(response.Data)
path := make(accounts.DerivationPath, len(response.Data)/4)
return path, binary.Read(buf, binary.BigEndian, &path)
@ -845,11 +876,11 @@ func (s *Session) derive(path accounts.DerivationPath) (accounts.Account, error)
// start again.
remainingPath := path
pubkey, err := s.getPublicKey()
pubkey, err := s.publicKey()
if err != nil {
return accounts.Account{}, err
}
currentPath, err := s.getDerivationPath()
currentPath, err := s.derivationPath()
if err != nil {
return accounts.Account{}, err
}
@ -910,7 +941,6 @@ func (s *Session) deriveKeyAssisted(reset bool, pathComponent uint32) ([]byte, e
if _, err := asn1.UnmarshalWithParams(response.Data, keyinfo, "tag:2"); err != nil {
return nil, err
}
rbytes, sbytes := keyinfo.Signature.R.Bytes(), keyinfo.Signature.S.Bytes()
sig := make([]byte, 65)
copy(sig[32-len(rbytes):32], rbytes)
@ -920,12 +950,10 @@ func (s *Session) deriveKeyAssisted(reset bool, pathComponent uint32) ([]byte, e
if err != nil {
return nil, err
}
_, err = s.Channel.TransmitEncrypted(claSCWallet, insDeriveKey, deriveP1Assisted|deriveP1Append, deriveP2PublicKey, pubkey)
if err != nil {
return nil, err
}
return pubkey, nil
}
@ -935,18 +963,16 @@ type keyExport struct {
PrivateKey []byte `asn1:"tag:1,optional"`
}
// getPublicKey returns the public key for the current derivation path.
func (s *Session) getPublicKey() ([]byte, error) {
// publicKey returns the public key for the current derivation path.
func (s *Session) publicKey() ([]byte, error) {
response, err := s.Channel.TransmitEncrypted(claSCWallet, insExportKey, exportP1Any, exportP2Pubkey, nil)
if err != nil {
return nil, err
}
keys := new(keyExport)
if _, err := asn1.UnmarshalWithParams(response.Data, keys, "tag:1"); err != nil {
return nil, err
}
return keys.PublicKey, nil
}
@ -974,12 +1000,10 @@ func (s *Session) sign(path accounts.DerivationPath, hash []byte) ([]byte, error
if err != nil {
return nil, err
}
sigdata := new(signatureData)
if _, err := asn1.UnmarshalWithParams(response.Data, sigdata, "tag:0"); err != nil {
return nil, err
}
// Serialize the signature
rbytes, sbytes := sigdata.Signature.R.Bytes(), sigdata.Signature.S.Bytes()
sig := make([]byte, 65)
@ -991,7 +1015,6 @@ func (s *Session) sign(path accounts.DerivationPath, hash []byte) ([]byte, error
if err != nil {
return nil, err
}
log.Debug("Signed using smartcard", "deriveTime", deriveTime.Sub(startTime), "signingTime", time.Since(deriveTime))
return sig, nil

31
accounts/sort.go Normal file
View File

@ -0,0 +1,31 @@
// Copyright 2018 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 accounts
// AccountsByURL implements sort.Interface for []Account based on the URL field.
type AccountsByURL []Account
func (a AccountsByURL) Len() int { return len(a) }
func (a AccountsByURL) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a AccountsByURL) Less(i, j int) bool { return a[i].URL.Cmp(a[j].URL) < 0 }
// WalletsByURL implements sort.Interface for []Wallet based on the URL field.
type WalletsByURL []Wallet
func (w WalletsByURL) Len() int { return len(w) }
func (w WalletsByURL) Swap(i, j int) { w[i], w[j] = w[j], w[i] }
func (w WalletsByURL) Less(i, j int) bool { return w[i].URL().Cmp(w[j].URL()) < 0 }

18
console/bridge.go
View File

@ -141,6 +141,24 @@ func (b *bridge) OpenWallet(call otto.FunctionCall) (response otto.Value) {
}
}
case strings.HasSuffix(err.Error(), scwallet.ErrPINUnblockNeeded.Error()):
// PIN unblock requested, fetch PUK and new PIN from the user
var pukpin string
if input, err := b.prompter.PromptPassword("Please enter current PUK: "); err != nil {
throwJSException(err.Error())
} else {
pukpin = input
}
if input, err := b.prompter.PromptPassword("Please enter new PIN: "); err != nil {
throwJSException(err.Error())
} else {
pukpin += input
}
passwd, _ = otto.ToValue(pukpin)
if val, err = call.Otto.Call("jeth.openWallet", nil, wallet, passwd); err != nil {
throwJSException(err.Error())
}
case strings.HasSuffix(err.Error(), scwallet.ErrPINNeeded.Error()):
// PIN input requested, fetch from the user and call open again
if input, err := b.prompter.PromptPassword("Please enter current PIN: "); err != nil {