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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
// Copyright 2018 The go-ethereum Authors
// 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 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 General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package rules
import (
"encoding/json"
"fmt"
"os"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/signer/core"
"github.com/ethereum/go-ethereum/signer/rules/deps"
"github.com/ethereum/go-ethereum/signer/storage"
"github.com/robertkrimen/otto"
)
var (
BigNumber_JS = deps.MustAsset("bignumber.js")
)
// consoleOutput is an override for the console.log and console.error methods to
// stream the output into the configured output stream instead of stdout.
func consoleOutput(call otto.FunctionCall) otto.Value {
output := []string{"JS:> "}
for _, argument := range call.ArgumentList {
output = append(output, fmt.Sprintf("%v", argument))
}
fmt.Fprintln(os.Stdout, strings.Join(output, " "))
return otto.Value{}
}
// rulesetUi provides an implementation of SignerUI that evaluates a javascript
// file for each defined UI-method
type rulesetUi struct {
next core.SignerUI // The next handler, for manual processing
storage storage.Storage
credentials storage.Storage
jsRules string // The rules to use
}
func NewRuleEvaluator(next core.SignerUI, jsbackend, credentialsBackend storage.Storage) (*rulesetUi, error) {
c := &rulesetUi{
next: next,
storage: jsbackend,
credentials: credentialsBackend,
jsRules: "",
}
return c, nil
}
func (r *rulesetUi) Init(javascriptRules string) error {
r.jsRules = javascriptRules
return nil
}
func (r *rulesetUi) execute(jsfunc string, jsarg interface{}) (otto.Value, error) {
// Instantiate a fresh vm engine every time
vm := otto.New()
// Set the native callbacks
consoleObj, _ := vm.Get("console")
consoleObj.Object().Set("log", consoleOutput)
consoleObj.Object().Set("error", consoleOutput)
vm.Set("storage", r.storage)
// Load bootstrap libraries
script, err := vm.Compile("bignumber.js", BigNumber_JS)
if err != nil {
log.Warn("Failed loading libraries", "err", err)
return otto.UndefinedValue(), err
}
vm.Run(script)
// Run the actual rule implementation
_, err = vm.Run(r.jsRules)
if err != nil {
log.Warn("Execution failed", "err", err)
return otto.UndefinedValue(), err
}
// And the actual call
// All calls are objects with the parameters being keys in that object.
// To provide additional insulation between js and go, we serialize it into JSON on the Go-side,
// and deserialize it on the JS side.
jsonbytes, err := json.Marshal(jsarg)
if err != nil {
log.Warn("failed marshalling data", "data", jsarg)
return otto.UndefinedValue(), err
}
// Now, we call foobar(JSON.parse(<jsondata>)).
var call string
if len(jsonbytes) > 0 {
call = fmt.Sprintf("%v(JSON.parse(%v))", jsfunc, string(jsonbytes))
} else {
call = fmt.Sprintf("%v()", jsfunc)
}
return vm.Run(call)
}
func (r *rulesetUi) checkApproval(jsfunc string, jsarg []byte, err error) (bool, error) {
if err != nil {
return false, err
}
v, err := r.execute(jsfunc, string(jsarg))
if err != nil {
log.Info("error occurred during execution", "error", err)
return false, err
}
result, err := v.ToString()
if err != nil {
log.Info("error occurred during response unmarshalling", "error", err)
return false, err
}
if result == "Approve" {
log.Info("Op approved")
return true, nil
} else if result == "Reject" {
log.Info("Op rejected")
return false, nil
}
return false, fmt.Errorf("Unknown response")
}
func (r *rulesetUi) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveTx", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveTx(request)
}
if approved {
return core.SignTxResponse{
Transaction: request.Transaction,
Approved: true,
Password: r.lookupPassword(request.Transaction.From.Address()),
},
nil
}
return core.SignTxResponse{Approved: false}, err
}
func (r *rulesetUi) lookupPassword(address common.Address) string {
return r.credentials.Get(strings.ToLower(address.String()))
}
func (r *rulesetUi) ApproveSignData(request *core.SignDataRequest) (core.SignDataResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveSignData", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveSignData(request)
}
if approved {
return core.SignDataResponse{Approved: true, Password: r.lookupPassword(request.Address.Address())}, nil
}
return core.SignDataResponse{Approved: false, Password: ""}, err
}
func (r *rulesetUi) ApproveExport(request *core.ExportRequest) (core.ExportResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveExport", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveExport(request)
}
if approved {
return core.ExportResponse{Approved: true}, nil
}
return core.ExportResponse{Approved: false}, err
}
func (r *rulesetUi) ApproveImport(request *core.ImportRequest) (core.ImportResponse, error) {
// This cannot be handled by rules, requires setting a password
// dispatch to next
return r.next.ApproveImport(request)
}
func (r *rulesetUi) ApproveListing(request *core.ListRequest) (core.ListResponse, error) {
jsonreq, err := json.Marshal(request)
approved, err := r.checkApproval("ApproveListing", jsonreq, err)
if err != nil {
log.Info("Rule-based approval error, going to manual", "error", err)
return r.next.ApproveListing(request)
}
if approved {
return core.ListResponse{Accounts: request.Accounts}, nil
}
return core.ListResponse{}, err
}
func (r *rulesetUi) ApproveNewAccount(request *core.NewAccountRequest) (core.NewAccountResponse, error) {
// This cannot be handled by rules, requires setting a password
// dispatch to next
return r.next.ApproveNewAccount(request)
}
func (r *rulesetUi) ShowError(message string) {
log.Error(message)
r.next.ShowError(message)
}
func (r *rulesetUi) ShowInfo(message string) {
log.Info(message)
r.next.ShowInfo(message)
}
func (r *rulesetUi) OnSignerStartup(info core.StartupInfo) {
jsonInfo, err := json.Marshal(info)
if err != nil {
log.Warn("failed marshalling data", "data", info)
return
}
r.next.OnSignerStartup(info)
_, err = r.execute("OnSignerStartup", string(jsonInfo))
if err != nil {
log.Info("error occurred during execution", "error", err)
}
}
func (r *rulesetUi) OnApprovedTx(tx ethapi.SignTransactionResult) {
jsonTx, err := json.Marshal(tx)
if err != nil {
log.Warn("failed marshalling transaction", "tx", tx)
return
}
_, err = r.execute("OnApprovedTx", string(jsonTx))
if err != nil {
log.Info("error occurred during execution", "error", err)
}
}
|