-
-
Notifications
You must be signed in to change notification settings - Fork 418
/
pair.go
248 lines (217 loc) · 7.76 KB
/
pair.go
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 (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"bytes"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"fmt"
"strings"
"go.mau.fi/libsignal/ecc"
"google.golang.org/protobuf/proto"
waBinary "go.mau.fi/whatsmeow/binary"
waProto "go.mau.fi/whatsmeow/binary/proto"
"go.mau.fi/whatsmeow/types"
"go.mau.fi/whatsmeow/types/events"
"go.mau.fi/whatsmeow/util/keys"
)
func (cli *Client) handleIQ(node *waBinary.Node) {
children := node.GetChildren()
if len(children) != 1 || node.Attrs["from"] != types.ServerJID {
return
}
switch children[0].Tag {
case "pair-device":
cli.handlePairDevice(node)
case "pair-success":
cli.handlePairSuccess(node)
}
}
func (cli *Client) handlePairDevice(node *waBinary.Node) {
pairDevice := node.GetChildByTag("pair-device")
err := cli.sendNode(waBinary.Node{
Tag: "iq",
Attrs: waBinary.Attrs{
"to": node.Attrs["from"],
"id": node.Attrs["id"],
"type": "result",
},
})
if err != nil {
cli.Log.Warnf("Failed to send acknowledgement for pair-device request: %v", err)
}
evt := &events.QR{Codes: make([]string, 0, len(pairDevice.GetChildren()))}
for i, child := range pairDevice.GetChildren() {
if child.Tag != "ref" {
cli.Log.Warnf("pair-device node contains unexpected child tag %s at index %d", child.Tag, i)
continue
}
content, ok := child.Content.([]byte)
if !ok {
cli.Log.Warnf("pair-device node contains unexpected child content type %T at index %d", child, i)
continue
}
evt.Codes = append(evt.Codes, cli.makeQRData(string(content)))
}
cli.dispatchEvent(evt)
}
func (cli *Client) makeQRData(ref string) string {
noise := base64.StdEncoding.EncodeToString(cli.Store.NoiseKey.Pub[:])
identity := base64.StdEncoding.EncodeToString(cli.Store.IdentityKey.Pub[:])
adv := base64.StdEncoding.EncodeToString(cli.Store.AdvSecretKey)
return strings.Join([]string{ref, noise, identity, adv}, ",")
}
func (cli *Client) handlePairSuccess(node *waBinary.Node) {
id := node.Attrs["id"].(string)
pairSuccess := node.GetChildByTag("pair-success")
deviceIdentityBytes, _ := pairSuccess.GetChildByTag("device-identity").Content.([]byte)
businessName, _ := pairSuccess.GetChildByTag("biz").Attrs["name"].(string)
jid, _ := pairSuccess.GetChildByTag("device").Attrs["jid"].(types.JID)
platform, _ := pairSuccess.GetChildByTag("platform").Attrs["name"].(string)
go func() {
err := cli.handlePair(deviceIdentityBytes, id, businessName, platform, jid)
if err != nil {
cli.Log.Errorf("Failed to pair device: %v", err)
cli.Disconnect()
cli.dispatchEvent(&events.PairError{ID: jid, BusinessName: businessName, Platform: platform, Error: err})
} else {
cli.Log.Infof("Successfully paired %s", cli.Store.ID)
cli.dispatchEvent(&events.PairSuccess{ID: jid, BusinessName: businessName, Platform: platform})
}
}()
}
func (cli *Client) handlePair(deviceIdentityBytes []byte, reqID, businessName, platform string, jid types.JID) error {
var deviceIdentityContainer waProto.ADVSignedDeviceIdentityHMAC
err := proto.Unmarshal(deviceIdentityBytes, &deviceIdentityContainer)
if err != nil {
cli.sendPairError(reqID, 500, "internal-error")
return &PairProtoError{"failed to parse device identity container in pair success message", err}
}
h := hmac.New(sha256.New, cli.Store.AdvSecretKey)
h.Write(deviceIdentityContainer.Details)
if !bytes.Equal(h.Sum(nil), deviceIdentityContainer.HMAC) {
cli.Log.Warnf("Invalid HMAC from pair success message")
cli.sendPairError(reqID, 401, "not-authorized")
return ErrPairInvalidDeviceIdentityHMAC
}
var deviceIdentity waProto.ADVSignedDeviceIdentity
err = proto.Unmarshal(deviceIdentityContainer.Details, &deviceIdentity)
if err != nil {
cli.sendPairError(reqID, 500, "internal-error")
return &PairProtoError{"failed to parse signed device identity in pair success message", err}
}
if !verifyDeviceIdentityAccountSignature(&deviceIdentity, cli.Store.IdentityKey) {
cli.sendPairError(reqID, 401, "not-authorized")
return ErrPairInvalidDeviceSignature
}
deviceIdentity.DeviceSignature = generateDeviceSignature(&deviceIdentity, cli.Store.IdentityKey)[:]
var deviceIdentityDetails waProto.ADVDeviceIdentity
err = proto.Unmarshal(deviceIdentity.Details, &deviceIdentityDetails)
if err != nil {
cli.sendPairError(reqID, 500, "internal-error")
return &PairProtoError{"failed to parse device identity details in pair success message", err}
}
if cli.PrePairCallback != nil && !cli.PrePairCallback(jid, platform, businessName) {
cli.sendPairError(reqID, 500, "internal-error")
return ErrPairRejectedLocally
}
cli.Store.Account = proto.Clone(&deviceIdentity).(*waProto.ADVSignedDeviceIdentity)
mainDeviceJID := jid
mainDeviceJID.Device = 0
mainDeviceIdentity := *(*[32]byte)(deviceIdentity.AccountSignatureKey)
deviceIdentity.AccountSignatureKey = nil
selfSignedDeviceIdentity, err := proto.Marshal(&deviceIdentity)
if err != nil {
cli.sendPairError(reqID, 500, "internal-error")
return &PairProtoError{"failed to marshal self-signed device identity", err}
}
cli.Store.ID = &jid
cli.Store.BusinessName = businessName
cli.Store.Platform = platform
err = cli.Store.Save()
if err != nil {
cli.sendPairError(reqID, 500, "internal-error")
return &PairDatabaseError{"failed to save device store", err}
}
err = cli.Store.Identities.PutIdentity(mainDeviceJID.SignalAddress().String(), mainDeviceIdentity)
if err != nil {
_ = cli.Store.Delete()
cli.sendPairError(reqID, 500, "internal-error")
return &PairDatabaseError{"failed to store main device identity", err}
}
// Expect a disconnect after this and don't dispatch the usual Disconnected event
cli.expectDisconnect()
err = cli.sendNode(waBinary.Node{
Tag: "iq",
Attrs: waBinary.Attrs{
"to": types.ServerJID,
"type": "result",
"id": reqID,
},
Content: []waBinary.Node{{
Tag: "pair-device-sign",
Content: []waBinary.Node{{
Tag: "device-identity",
Attrs: waBinary.Attrs{
"key-index": deviceIdentityDetails.GetKeyIndex(),
},
Content: selfSignedDeviceIdentity,
}},
}},
})
if err != nil {
_ = cli.Store.Delete()
return fmt.Errorf("failed to send pairing confirmation: %w", err)
}
return nil
}
func concatBytes(data ...[]byte) []byte {
length := 0
for _, item := range data {
length += len(item)
}
output := make([]byte, length)
ptr := 0
for _, item := range data {
ptr += copy(output[ptr:ptr+len(item)], item)
}
return output
}
func verifyDeviceIdentityAccountSignature(deviceIdentity *waProto.ADVSignedDeviceIdentity, ikp *keys.KeyPair) bool {
if len(deviceIdentity.AccountSignatureKey) != 32 || len(deviceIdentity.AccountSignature) != 64 {
return false
}
signatureKey := ecc.NewDjbECPublicKey(*(*[32]byte)(deviceIdentity.AccountSignatureKey))
signature := *(*[64]byte)(deviceIdentity.AccountSignature)
message := concatBytes([]byte{6, 0}, deviceIdentity.Details, ikp.Pub[:])
return ecc.VerifySignature(signatureKey, message, signature)
}
func generateDeviceSignature(deviceIdentity *waProto.ADVSignedDeviceIdentity, ikp *keys.KeyPair) *[64]byte {
message := concatBytes([]byte{6, 1}, deviceIdentity.Details, ikp.Pub[:], deviceIdentity.AccountSignatureKey)
sig := ecc.CalculateSignature(ecc.NewDjbECPrivateKey(*ikp.Priv), message)
return &sig
}
func (cli *Client) sendPairError(id string, code int, text string) {
err := cli.sendNode(waBinary.Node{
Tag: "iq",
Attrs: waBinary.Attrs{
"to": types.ServerJID,
"type": "error",
"id": id,
},
Content: []waBinary.Node{{
Tag: "error",
Attrs: waBinary.Attrs{
"code": code,
"text": text,
},
}},
})
if err != nil {
cli.Log.Errorf("Failed to send pair error node: %v", err)
}
}