2015-07-07 00:54:22 +00:00
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// Copyright 2015 The go-ethereum Authors
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2015-07-22 16:48:40 +00:00
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// This file is part of the go-ethereum library.
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2015-07-07 00:54:22 +00:00
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//
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2015-07-23 16:35:11 +00:00
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// The go-ethereum library is free software: you can redistribute it and/or modify
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2015-07-07 00:54:22 +00:00
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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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2015-07-22 16:48:40 +00:00
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// The go-ethereum library is distributed in the hope that it will be useful,
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2015-07-07 00:54:22 +00:00
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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2015-07-22 16:48:40 +00:00
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2015-07-07 00:54:22 +00:00
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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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2015-07-22 16:48:40 +00:00
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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2015-01-25 01:07:20 +00:00
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2016-04-04 23:08:50 +00:00
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// Package accounts implements encrypted storage of secp256k1 private keys.
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2015-07-07 03:08:16 +00:00
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//
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2016-04-04 23:08:50 +00:00
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// Keys are stored as encrypted JSON files according to the Web3 Secret Storage specification.
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// See https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition for more information.
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2015-01-25 01:07:20 +00:00
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package accounts
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import (
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2015-03-07 23:35:23 +00:00
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"crypto/ecdsa"
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2015-01-25 01:07:20 +00:00
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crand "crypto/rand"
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2016-03-03 00:15:42 +00:00
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"encoding/json"
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2015-02-25 16:29:23 +00:00
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"errors"
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2015-07-03 03:56:20 +00:00
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"fmt"
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2016-03-03 00:15:42 +00:00
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"os"
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"path/filepath"
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"runtime"
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2015-02-25 16:29:23 +00:00
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"sync"
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"time"
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2015-02-26 10:16:01 +00:00
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2015-04-02 19:14:25 +00:00
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"github.com/ethereum/go-ethereum/common"
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2015-01-25 01:07:20 +00:00
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"github.com/ethereum/go-ethereum/crypto"
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)
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2015-03-07 11:38:33 +00:00
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var (
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2016-03-03 00:15:42 +00:00
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ErrLocked = errors.New("account is locked")
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ErrNoMatch = errors.New("no key for given address or file")
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2016-04-01 20:41:47 +00:00
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ErrDecrypt = errors.New("could not decrypt key with given passphrase")
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2015-03-07 11:38:33 +00:00
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)
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2015-02-25 16:29:23 +00:00
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2016-04-04 23:08:50 +00:00
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// Account represents a stored key.
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// When used as an argument, it selects a unique key file to act on.
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2015-01-28 04:12:57 +00:00
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type Account struct {
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2016-04-04 23:08:50 +00:00
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Address common.Address // Ethereum account address derived from the key
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// File contains the key file name.
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// When Acccount is used as an argument to select a key, File can be left blank to
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// select just by address or set to the basename or absolute path of a file in the key
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// directory. Accounts returned by Manager will always contain an absolute path.
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File string
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2015-01-25 01:07:20 +00:00
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}
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2015-10-15 14:07:19 +00:00
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func (acc *Account) MarshalJSON() ([]byte, error) {
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return []byte(`"` + acc.Address.Hex() + `"`), nil
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}
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2016-03-03 00:15:42 +00:00
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func (acc *Account) UnmarshalJSON(raw []byte) error {
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return json.Unmarshal(raw, &acc.Address)
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}
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2016-04-04 23:08:50 +00:00
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// Manager manages a key storage directory on disk.
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2015-03-08 00:52:49 +00:00
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type Manager struct {
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2016-03-03 00:15:42 +00:00
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cache *addrCache
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2016-03-02 12:57:15 +00:00
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keyStore keyStore
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2016-03-03 00:15:42 +00:00
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mu sync.RWMutex
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2015-04-02 19:14:25 +00:00
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unlocked map[common.Address]*unlocked
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2015-03-08 00:27:30 +00:00
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}
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type unlocked struct {
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2016-03-02 12:57:15 +00:00
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*Key
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2015-03-08 01:45:02 +00:00
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abort chan struct{}
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2015-01-25 01:07:20 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// NewManager creates a manager for the given directory.
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2016-03-02 12:57:15 +00:00
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func NewManager(keydir string, scryptN, scryptP int) *Manager {
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2016-03-03 00:15:42 +00:00
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keydir, _ = filepath.Abs(keydir)
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am := &Manager{keyStore: &keyStorePassphrase{keydir, scryptN, scryptP}}
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am.init(keydir)
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return am
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2016-03-02 12:57:15 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// NewPlaintextManager creates a manager for the given directory.
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// Deprecated: Use NewManager.
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2016-03-02 12:57:15 +00:00
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func NewPlaintextManager(keydir string) *Manager {
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2016-03-03 00:15:42 +00:00
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keydir, _ = filepath.Abs(keydir)
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am := &Manager{keyStore: &keyStorePlain{keydir}}
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am.init(keydir)
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return am
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}
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func (am *Manager) init(keydir string) {
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am.unlocked = make(map[common.Address]*unlocked)
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am.cache = newAddrCache(keydir)
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// TODO: In order for this finalizer to work, there must be no references
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// to am. addrCache doesn't keep a reference but unlocked keys do,
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// so the finalizer will not trigger until all timed unlocks have expired.
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runtime.SetFinalizer(am, func(m *Manager) {
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m.cache.close()
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})
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2015-01-25 01:07:20 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// HasAddress reports whether a key with the given address is present.
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2016-03-03 00:09:16 +00:00
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func (am *Manager) HasAddress(addr common.Address) bool {
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2016-03-03 00:15:42 +00:00
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return am.cache.hasAddress(addr)
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}
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2016-04-04 23:08:50 +00:00
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// Accounts returns all key files present in the directory.
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2016-03-03 00:15:42 +00:00
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func (am *Manager) Accounts() []Account {
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return am.cache.accounts()
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2015-03-09 22:02:43 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// DeleteAccount deletes the key matched by account if the passphrase is correct.
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// If a contains no filename, the address must match a unique key.
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func (am *Manager) DeleteAccount(a Account, passphrase string) error {
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2016-03-03 00:15:42 +00:00
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// Decrypting the key isn't really necessary, but we do
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// it anyway to check the password and zero out the key
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// immediately afterwards.
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2016-04-04 23:08:50 +00:00
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a, key, err := am.getDecryptedKey(a, passphrase)
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2016-03-03 00:15:42 +00:00
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if key != nil {
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zeroKey(key.PrivateKey)
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}
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if err != nil {
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return err
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}
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// The order is crucial here. The key is dropped from the
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// cache after the file is gone so that a reload happening in
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// between won't insert it into the cache again.
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err = os.Remove(a.File)
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if err == nil {
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am.cache.delete(a)
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}
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return err
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2015-02-24 17:03:10 +00:00
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}
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2016-10-28 19:25:49 +00:00
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// Sign calculates a ECDSA signature for the given hash.
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// Note, Ethereum signatures have a particular format as described in the
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// yellow paper. Use the SignEthereum function to calculate a signature
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// in Ethereum format.
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func (am *Manager) Sign(addr common.Address, hash []byte) ([]byte, error) {
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2016-03-03 00:15:42 +00:00
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am.mu.RLock()
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defer am.mu.RUnlock()
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2016-04-04 23:08:50 +00:00
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unlockedKey, found := am.unlocked[addr]
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2015-03-08 00:27:30 +00:00
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if !found {
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2015-02-25 16:29:23 +00:00
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return nil, ErrLocked
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}
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2016-04-04 23:08:50 +00:00
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return crypto.Sign(hash, unlockedKey.PrivateKey)
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2015-02-25 16:29:23 +00:00
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}
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2016-10-28 19:25:49 +00:00
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// SignEthereum calculates a ECDSA signature for the given hash.
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// The signature has the format as described in the Ethereum yellow paper.
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func (am *Manager) SignEthereum(addr common.Address, hash []byte) ([]byte, error) {
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am.mu.RLock()
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defer am.mu.RUnlock()
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unlockedKey, found := am.unlocked[addr]
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if !found {
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return nil, ErrLocked
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}
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return crypto.SignEthereum(hash, unlockedKey.PrivateKey)
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}
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// SignWithPassphrase signs hash if the private key matching the given
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// address can be decrypted with the given passphrase.
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2016-05-12 17:32:04 +00:00
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func (am *Manager) SignWithPassphrase(addr common.Address, passphrase string, hash []byte) (signature []byte, err error) {
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_, key, err := am.getDecryptedKey(Account{Address: addr}, passphrase)
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if err != nil {
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return nil, err
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}
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defer zeroKey(key.PrivateKey)
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2016-10-28 19:25:49 +00:00
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return crypto.SignEthereum(hash, key.PrivateKey)
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2016-05-12 17:32:04 +00:00
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}
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2015-07-20 15:42:14 +00:00
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// Unlock unlocks the given account indefinitely.
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2016-05-12 17:32:04 +00:00
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func (am *Manager) Unlock(a Account, passphrase string) error {
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return am.TimedUnlock(a, passphrase, 0)
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2015-06-18 14:12:39 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// Lock removes the private key with the given address from memory.
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2015-10-15 14:07:19 +00:00
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func (am *Manager) Lock(addr common.Address) error {
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2016-03-03 00:15:42 +00:00
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am.mu.Lock()
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2015-10-15 14:07:19 +00:00
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if unl, found := am.unlocked[addr]; found {
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2016-03-03 00:15:42 +00:00
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am.mu.Unlock()
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2015-12-16 09:58:01 +00:00
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am.expire(addr, unl, time.Duration(0)*time.Nanosecond)
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2015-10-15 14:07:19 +00:00
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} else {
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2016-03-03 00:15:42 +00:00
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am.mu.Unlock()
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2015-10-15 14:07:19 +00:00
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}
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return nil
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}
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2016-04-07 15:00:34 +00:00
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// TimedUnlock unlocks the given account with the passphrase. The account
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2015-07-20 15:42:14 +00:00
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// stays unlocked for the duration of timeout. A timeout of 0 unlocks the account
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2016-04-07 15:00:34 +00:00
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// until the program exits. The account must match a unique key file.
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2015-07-20 15:42:14 +00:00
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//
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2016-04-07 15:00:34 +00:00
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// If the account address is already unlocked for a duration, TimedUnlock extends or
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// shortens the active unlock timeout. If the address was previously unlocked
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// indefinitely the timeout is not altered.
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func (am *Manager) TimedUnlock(a Account, passphrase string, timeout time.Duration) error {
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a, key, err := am.getDecryptedKey(a, passphrase)
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2015-01-25 01:07:20 +00:00
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if err != nil {
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2015-03-09 23:09:39 +00:00
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return err
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2015-01-25 01:07:20 +00:00
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}
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2016-03-03 00:15:42 +00:00
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am.mu.Lock()
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defer am.mu.Unlock()
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u, found := am.unlocked[a.Address]
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2015-06-18 14:12:39 +00:00
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if found {
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2016-04-07 15:00:34 +00:00
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if u.abort == nil {
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// The address was unlocked indefinitely, so unlocking
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// it with a timeout would be confusing.
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zeroKey(key.PrivateKey)
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return nil
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} else {
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// Terminate the expire goroutine and replace it below.
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2015-06-18 14:12:39 +00:00
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close(u.abort)
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}
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}
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if timeout > 0 {
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u = &unlocked{Key: key, abort: make(chan struct{})}
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2016-03-03 00:09:16 +00:00
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go am.expire(a.Address, u, timeout)
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2015-06-18 14:12:39 +00:00
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} else {
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u = &unlocked{Key: key}
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}
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2016-03-03 00:09:16 +00:00
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am.unlocked[a.Address] = u
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2015-03-09 23:09:39 +00:00
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return nil
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}
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2016-09-22 00:23:50 +00:00
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// Find resolves the given account into a unique entry in the keystore.
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func (am *Manager) Find(a Account) (Account, error) {
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2016-03-03 00:15:42 +00:00
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am.cache.maybeReload()
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am.cache.mu.Lock()
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a, err := am.cache.find(a)
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am.cache.mu.Unlock()
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2016-09-22 00:23:50 +00:00
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return a, err
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}
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func (am *Manager) getDecryptedKey(a Account, auth string) (Account, *Key, error) {
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a, err := am.Find(a)
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2016-03-03 00:15:42 +00:00
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if err != nil {
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return a, nil, err
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}
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key, err := am.keyStore.GetKey(a.Address, a.File, auth)
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return a, key, err
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}
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2015-06-18 14:12:39 +00:00
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func (am *Manager) expire(addr common.Address, u *unlocked, timeout time.Duration) {
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t := time.NewTimer(timeout)
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defer t.Stop()
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select {
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case <-u.abort:
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// just quit
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case <-t.C:
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2016-03-03 00:15:42 +00:00
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am.mu.Lock()
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2015-06-18 14:12:39 +00:00
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// only drop if it's still the same key instance that dropLater
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// was launched with. we can check that using pointer equality
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// because the map stores a new pointer every time the key is
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// unlocked.
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if am.unlocked[addr] == u {
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zeroKey(u.PrivateKey)
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delete(am.unlocked, addr)
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}
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2016-03-03 00:15:42 +00:00
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am.mu.Unlock()
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2015-03-09 23:09:39 +00:00
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}
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2015-01-25 01:07:20 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// NewAccount generates a new key and stores it into the key directory,
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// encrypting it with the passphrase.
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func (am *Manager) NewAccount(passphrase string) (Account, error) {
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_, account, err := storeNewKey(am.keyStore, crand.Reader, passphrase)
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2015-01-25 01:07:20 +00:00
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if err != nil {
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2015-03-07 23:18:13 +00:00
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return Account{}, err
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2015-01-25 01:07:20 +00:00
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}
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2016-03-03 00:15:42 +00:00
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// Add the account to the cache immediately rather
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// than waiting for file system notifications to pick it up.
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am.cache.add(account)
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return account, nil
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2015-01-25 01:07:20 +00:00
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}
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2016-04-04 23:08:50 +00:00
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// AccountByIndex returns the ith account.
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func (am *Manager) AccountByIndex(i int) (Account, error) {
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2016-03-03 00:15:42 +00:00
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accounts := am.Accounts()
|
2016-04-04 23:08:50 +00:00
|
|
|
if i < 0 || i >= len(accounts) {
|
|
|
|
return Account{}, fmt.Errorf("account index %d out of range [0, %d]", i, len(accounts)-1)
|
2015-03-08 00:27:30 +00:00
|
|
|
}
|
2016-04-04 23:08:50 +00:00
|
|
|
return accounts[i], nil
|
2015-02-25 16:29:23 +00:00
|
|
|
}
|
2015-03-23 13:00:06 +00:00
|
|
|
|
2016-04-04 23:08:50 +00:00
|
|
|
// Export exports as a JSON key, encrypted with newPassphrase.
|
|
|
|
func (am *Manager) Export(a Account, passphrase, newPassphrase string) (keyJSON []byte, err error) {
|
|
|
|
_, key, err := am.getDecryptedKey(a, passphrase)
|
2015-03-23 13:00:06 +00:00
|
|
|
if err != nil {
|
2016-04-04 23:08:50 +00:00
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
var N, P int
|
|
|
|
if store, ok := am.keyStore.(*keyStorePassphrase); ok {
|
|
|
|
N, P = store.scryptN, store.scryptP
|
|
|
|
} else {
|
|
|
|
N, P = StandardScryptN, StandardScryptP
|
2015-03-23 13:00:06 +00:00
|
|
|
}
|
2016-04-04 23:08:50 +00:00
|
|
|
return EncryptKey(key, newPassphrase, N, P)
|
2015-03-23 13:00:06 +00:00
|
|
|
}
|
|
|
|
|
2016-04-04 23:08:50 +00:00
|
|
|
// Import stores the given encrypted JSON key into the key directory.
|
|
|
|
func (am *Manager) Import(keyJSON []byte, passphrase, newPassphrase string) (Account, error) {
|
|
|
|
key, err := DecryptKey(keyJSON, passphrase)
|
|
|
|
if key != nil && key.PrivateKey != nil {
|
|
|
|
defer zeroKey(key.PrivateKey)
|
|
|
|
}
|
2015-03-23 13:00:06 +00:00
|
|
|
if err != nil {
|
|
|
|
return Account{}, err
|
|
|
|
}
|
2016-04-04 23:08:50 +00:00
|
|
|
return am.importKey(key, newPassphrase)
|
|
|
|
}
|
|
|
|
|
|
|
|
// ImportECDSA stores the given key into the key directory, encrypting it with the passphrase.
|
|
|
|
func (am *Manager) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (Account, error) {
|
2016-04-25 17:23:40 +00:00
|
|
|
key := newKeyFromECDSA(priv)
|
|
|
|
if am.cache.hasAddress(key.Address) {
|
|
|
|
return Account{}, fmt.Errorf("account already exists")
|
|
|
|
}
|
|
|
|
|
|
|
|
return am.importKey(key, passphrase)
|
2016-03-02 12:57:15 +00:00
|
|
|
}
|
|
|
|
|
2016-04-04 23:08:50 +00:00
|
|
|
func (am *Manager) importKey(key *Key, passphrase string) (Account, error) {
|
2016-03-03 00:15:42 +00:00
|
|
|
a := Account{Address: key.Address, File: am.keyStore.JoinPath(keyFileName(key.Address))}
|
2016-04-04 23:08:50 +00:00
|
|
|
if err := am.keyStore.StoreKey(a.File, key, passphrase); err != nil {
|
2015-03-23 13:00:06 +00:00
|
|
|
return Account{}, err
|
|
|
|
}
|
2016-03-03 00:15:42 +00:00
|
|
|
am.cache.add(a)
|
|
|
|
return a, nil
|
2015-03-23 13:00:06 +00:00
|
|
|
}
|
2015-03-24 16:19:11 +00:00
|
|
|
|
2016-04-04 23:08:50 +00:00
|
|
|
// Update changes the passphrase of an existing account.
|
|
|
|
func (am *Manager) Update(a Account, passphrase, newPassphrase string) error {
|
|
|
|
a, key, err := am.getDecryptedKey(a, passphrase)
|
2016-03-03 00:15:42 +00:00
|
|
|
if err != nil {
|
|
|
|
return err
|
2015-07-03 03:56:20 +00:00
|
|
|
}
|
2016-04-04 23:08:50 +00:00
|
|
|
return am.keyStore.StoreKey(a.File, key, newPassphrase)
|
2015-07-03 03:56:20 +00:00
|
|
|
}
|
|
|
|
|
2016-04-04 23:08:50 +00:00
|
|
|
// ImportPreSaleKey decrypts the given Ethereum presale wallet and stores
|
|
|
|
// a key file in the key directory. The key file is encrypted with the same passphrase.
|
|
|
|
func (am *Manager) ImportPreSaleKey(keyJSON []byte, passphrase string) (Account, error) {
|
|
|
|
a, _, err := importPreSaleKey(am.keyStore, keyJSON, passphrase)
|
2015-03-24 16:19:11 +00:00
|
|
|
if err != nil {
|
2016-03-03 00:15:42 +00:00
|
|
|
return a, err
|
|
|
|
}
|
|
|
|
am.cache.add(a)
|
|
|
|
return a, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// zeroKey zeroes a private key in memory.
|
|
|
|
func zeroKey(k *ecdsa.PrivateKey) {
|
|
|
|
b := k.D.Bits()
|
|
|
|
for i := range b {
|
|
|
|
b[i] = 0
|
2015-03-24 16:19:11 +00:00
|
|
|
}
|
|
|
|
}
|