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
|
/* eslint-disable node-core/required-modules, node-core/crypto-check */
'use strict';
const crypto = require('crypto');
const net = require('net');
exports.ccs = Buffer.from('140303000101', 'hex');
class TestTLSSocket extends net.Socket {
constructor(server_cert) {
super();
this.server_cert = server_cert;
this.version = Buffer.from('0303', 'hex');
this.handshake_list = [];
// AES128-GCM-SHA256
this.ciphers = Buffer.from('000002009c0', 'hex');
this.pre_master_secret =
Buffer.concat([this.version, crypto.randomBytes(46)]);
this.master_secret = null;
this.write_seq = 0;
this.client_random = crypto.randomBytes(32);
this.on('handshake', (msg) => {
this.handshake_list.push(msg);
});
this.on('server_random', (server_random) => {
this.master_secret = PRF12('sha256', this.pre_master_secret,
'master secret',
Buffer.concat([this.client_random,
server_random]),
48);
const key_block = PRF12('sha256', this.master_secret,
'key expansion',
Buffer.concat([server_random,
this.client_random]),
40);
this.client_writeKey = key_block.slice(0, 16);
this.client_writeIV = key_block.slice(32, 36);
});
}
createClientHello() {
const compressions = Buffer.from('0100', 'hex'); // null
const msg = addHandshakeHeader(0x01, Buffer.concat([
this.version, this.client_random, this.ciphers, compressions
]));
this.emit('handshake', msg);
return addRecordHeader(0x16, msg);
}
createClientKeyExchange() {
const encrypted_pre_master_secret = crypto.publicEncrypt({
key: this.server_cert,
padding: crypto.constants.RSA_PKCS1_PADDING
}, this.pre_master_secret);
const length = Buffer.alloc(2);
length.writeUIntBE(encrypted_pre_master_secret.length, 0, 2);
const msg = addHandshakeHeader(0x10, Buffer.concat([
length, encrypted_pre_master_secret]));
this.emit('handshake', msg);
return addRecordHeader(0x16, msg);
}
createFinished() {
const shasum = crypto.createHash('sha256');
shasum.update(Buffer.concat(this.handshake_list));
const message_hash = shasum.digest();
const r = PRF12('sha256', this.master_secret,
'client finished', message_hash, 12);
const msg = addHandshakeHeader(0x14, r);
this.emit('handshake', msg);
return addRecordHeader(0x16, msg);
}
createIllegalHandshake() {
const illegal_handshake = Buffer.alloc(5);
return addRecordHeader(0x16, illegal_handshake);
}
parseTLSFrame(buf) {
let offset = 0;
const record = buf.slice(offset, 5);
const type = record[0];
const length = record.slice(3, 5).readUInt16BE(0);
offset += 5;
let remaining = buf.slice(offset, offset + length);
if (type === 0x16) {
do {
remaining = this.parseTLSHandshake(remaining);
} while (remaining.length > 0);
}
offset += length;
return buf.slice(offset);
}
parseTLSHandshake(buf) {
let offset = 0;
const handshake_type = buf[offset];
if (handshake_type === 0x02) {
const server_random = buf.slice(6, 6 + 32);
this.emit('server_random', server_random);
}
offset += 1;
const length = buf.readUIntBE(offset, 3);
offset += 3;
const handshake = buf.slice(0, offset + length);
this.emit('handshake', handshake);
offset += length;
const remaining = buf.slice(offset);
return remaining;
}
encrypt(plain) {
const type = plain.slice(0, 1);
const version = plain.slice(1, 3);
const nonce = crypto.randomBytes(8);
const iv = Buffer.concat([this.client_writeIV.slice(0, 4), nonce]);
const bob = crypto.createCipheriv('aes-128-gcm', this.client_writeKey, iv);
const write_seq = Buffer.alloc(8);
write_seq.writeUInt32BE(this.write_seq++, 4);
const aad = Buffer.concat([write_seq, plain.slice(0, 5)]);
bob.setAAD(aad);
const encrypted1 = bob.update(plain.slice(5));
const encrypted = Buffer.concat([encrypted1, bob.final()]);
const tag = bob.getAuthTag();
const length = Buffer.alloc(2);
length.writeUInt16BE(nonce.length + encrypted.length + tag.length, 0);
return Buffer.concat([type, version, length, nonce, encrypted, tag]);
}
}
function addRecordHeader(type, frame) {
const record_layer = Buffer.from('0003030000', 'hex');
record_layer[0] = type;
record_layer.writeUInt16BE(frame.length, 3);
return Buffer.concat([record_layer, frame]);
}
function addHandshakeHeader(type, msg) {
const handshake_header = Buffer.alloc(4);
handshake_header[0] = type;
handshake_header.writeUIntBE(msg.length, 1, 3);
return Buffer.concat([handshake_header, msg]);
}
function PRF12(algo, secret, label, seed, size) {
const newSeed = Buffer.concat([Buffer.from(label, 'utf8'), seed]);
return P_hash(algo, secret, newSeed, size);
}
function P_hash(algo, secret, seed, size) {
const result = Buffer.alloc(size);
let hmac = crypto.createHmac(algo, secret);
hmac.update(seed);
let a = hmac.digest();
let j = 0;
while (j < size) {
hmac = crypto.createHmac(algo, secret);
hmac.update(a);
hmac.update(seed);
const b = hmac.digest();
let todo = b.length;
if (j + todo > size) {
todo = size - j;
}
b.copy(result, j, 0, todo);
j += todo;
hmac = crypto.createHmac(algo, secret);
hmac.update(a);
a = hmac.digest();
}
return result;
}
exports.TestTLSSocket = TestTLSSocket;
|
