1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
This file is part of go-ethereum
go-ethereum 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.
go-ethereum 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 General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @authors
* Gustav Simonsson <gustav.simonsson@gmail.com>
* @date 2015
*
*/
/*
This abstracts part of a user's interaction with an account she controls.
It's not an abstraction of core Ethereum accounts data type / logic -
for that see the core processing code of blocks / txs.
Currently this is pretty much a passthrough to the KeyStore2 interface,
and accounts persistence is derived from stored keys' addresses
*/
package accounts
import (
"crypto/ecdsa"
crand "crypto/rand"
"errors"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
)
var (
ErrLocked = errors.New("account is locked")
ErrNoKeys = errors.New("no keys in store")
)
type Account struct {
Address []byte
}
type AccountManager struct {
keyStore crypto.KeyStore2
unlocked map[string]*unlocked
unlockTime time.Duration
mutex sync.RWMutex
}
type unlocked struct {
addr []byte
abort chan struct{}
*crypto.Key
}
func NewAccountManager(keyStore crypto.KeyStore2, unlockTime time.Duration) *AccountManager {
return &AccountManager{
keyStore: keyStore,
unlocked: make(map[string]*unlocked),
unlockTime: unlockTime,
}
}
// Coinbase returns the account address that mining rewards are sent to.
func (am *AccountManager) Coinbase() (addr []byte, err error) {
// TODO: persist coinbase address on disk
return am.firstAddr()
}
// MainAccount returns the primary account used for transactions.
func (am *AccountManager) Default() (Account, error) {
// TODO: persist main account address on disk
addr, err := am.firstAddr()
return Account{Address: addr}, err
}
func (am *AccountManager) firstAddr() ([]byte, error) {
addrs, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
if len(addrs) == 0 {
return nil, ErrNoKeys
}
return addrs[0], nil
}
func (am *AccountManager) DeleteAccount(address []byte, auth string) error {
return am.keyStore.DeleteKey(address, auth)
}
func (am *AccountManager) Sign(a Account, toSign []byte) (signature []byte, err error) {
am.mutex.RLock()
unlockedKey, found := am.unlocked[string(a.Address)]
am.mutex.RUnlock()
if !found {
return nil, ErrLocked
}
signature, err = crypto.Sign(toSign, unlockedKey.PrivateKey)
return signature, err
}
func (am *AccountManager) SignLocked(a Account, keyAuth string, toSign []byte) (signature []byte, err error) {
key, err := am.keyStore.GetKey(a.Address, keyAuth)
if err != nil {
return nil, err
}
u := am.addUnlocked(a.Address, key)
go am.dropLater(u)
signature, err = crypto.Sign(toSign, key.PrivateKey)
return signature, err
}
func (am *AccountManager) NewAccount(auth string) (Account, error) {
key, err := am.keyStore.GenerateNewKey(crand.Reader, auth)
if err != nil {
return Account{}, err
}
return Account{Address: key.Address}, nil
}
func (am *AccountManager) Accounts() ([]Account, error) {
addresses, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
accounts := make([]Account, len(addresses))
for i, addr := range addresses {
accounts[i] = Account{
Address: addr,
}
}
return accounts, err
}
func (am *AccountManager) addUnlocked(addr []byte, key *crypto.Key) *unlocked {
u := &unlocked{addr: addr, abort: make(chan struct{}), Key: key}
am.mutex.Lock()
prev, found := am.unlocked[string(addr)]
if found {
// terminate dropLater for this key to avoid unexpected drops.
close(prev.abort)
zeroKey(prev.PrivateKey)
}
am.unlocked[string(addr)] = u
am.mutex.Unlock()
return u
}
func (am *AccountManager) dropLater(u *unlocked) {
t := time.NewTimer(am.unlockTime)
defer t.Stop()
select {
case <-u.abort:
// just quit
case <-t.C:
am.mutex.Lock()
if am.unlocked[string(u.addr)] == u {
zeroKey(u.PrivateKey)
delete(am.unlocked, string(u.addr))
}
am.mutex.Unlock()
}
}
// zeroKey zeroes a private key in memory.
func zeroKey(k *ecdsa.PrivateKey) {
b := k.D.Bits()
for i := range b {
b[i] = 0
}
}
|
