forked from Ylianst/MeshCentral
-
Notifications
You must be signed in to change notification settings - Fork 0
/
meshscanner.js
255 lines (232 loc) · 14.1 KB
/
meshscanner.js
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
249
250
251
252
253
254
255
/**
* @description MeshCentral Mesh Agent Local Scanner
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018-2020
* @license Apache-2.0
* @version v0.0.1
*/
/*jslint node: true */
/*jshint node: true */
/*jshint strict:false */
/*jshint -W097 */
/*jshint esversion: 6 */
"use strict";
// Construct a Mesh Scanner object
// TODO: We need once "server4" and "server6" per interface, or change the default multicast interface as we send.
module.exports.CreateMeshScanner = function (parent) {
var obj = {};
obj.parent = parent;
obj.dgram = require('dgram');
obj.common = require('./common.js');
obj.servers4 = {};
obj.servers6 = {};
obj.mainTimer = null;
const periodicScanTime = (60000 * 20); // Interval between scans, 20 minutes.
const membershipIPv4 = '239.255.255.235';
const membershipIPv6 = 'FF02:0:0:0:0:0:0:FE';
obj.agentCertificateHashHex = parent.certificateOperations.forge.pki.getPublicKeyFingerprint(parent.certificateOperations.forge.pki.certificateFromPem(parent.certificates.agent.cert).publicKey, { md: parent.certificateOperations.forge.md.sha384.create(), encoding: 'hex' }).toUpperCase();
obj.error = 0;
// Setup the multicast key if present
if ((typeof obj.parent.args.localdiscovery == 'object') && (typeof obj.parent.args.localdiscovery.key == 'string') && (obj.parent.args.localdiscovery.key.length > 0)) {
obj.multicastKey = parent.crypto.createHash('sha384').update(obj.parent.args.localdiscovery.key).digest('raw').slice(0, 32);
}
// Encrypt UDP packet
function encryptPacket(plainPacket) {
if (obj.multicastKey == null) { return plainPacket; }
const iv = parent.crypto.randomBytes(16), aes = parent.crypto.createCipheriv('aes-256-cbc', obj.multicastKey, iv);
var ciphertext = aes.update(plainPacket);
return Buffer.concat([iv, ciphertext, aes.final()]);
}
// Decrypt UDP packet
function decryptPacket(packet) {
if (obj.multicastKey == null) { return packet; }
if (packet.length < 17) { return null; }
try {
const iv = packet.slice(0, 16), data = packet.slice(16);
const aes = parent.crypto.createDecipheriv('aes-256-cbc', obj.multicastKey, iv);
var plaintextBytes = Buffer.from(aes.update(data));
return Buffer.concat([plaintextBytes, aes.final()]);
} catch (ex) { return null; }
}
// Get a list of IPv4 and IPv6 interface addresses
function getInterfaceList() {
var i;
var ipv4 = ['*'], ipv6 = ['*']; // Bind to IN_ADDR_ANY always
var interfaces = require('os').networkInterfaces();
for (i in interfaces) {
var xinterface = interfaces[i];
for (var j in xinterface) {
var interface2 = xinterface[j];
if ((interface2.mac != '00:00:00:00:00:00') && (interface2.internal == false)) {
if (interface2.family == 'IPv4') { ipv4.push(interface2.address); }
if (interface2.family == 'IPv6') { ipv6.push(interface2.address + '%' + i); }
}
}
}
return { ipv4: ipv4, ipv6: ipv6 };
}
// Setup all IPv4 and IPv6 servers
function setupServers() {
var addresses = getInterfaceList(), i, localAddress, bindOptions;
for (i in obj.servers4) { obj.servers4[i].xxclear = true; }
for (i in obj.servers6) { obj.servers6[i].xxclear = true; }
for (i in addresses.ipv4) {
localAddress = addresses.ipv4[i];
if (obj.servers4[localAddress] != null) {
// Server already exists
obj.servers4[localAddress].xxclear = false;
} else {
// Create a new IPv4 server
try {
var server4 = obj.dgram.createSocket({ type: 'udp4', reuseAddr: true });
server4.xxclear = false;
server4.xxtype = 4;
server4.xxlocal = localAddress;
server4.on('error', function (err) { if (this.xxlocal == '*') { console.log("ERROR: Server port 16989 not available, check if server is running twice."); } this.close(); delete obj.servers6[this.xxlocal]; });
bindOptions = { port: 16989, exclusive: true };
if (server4.xxlocal != '*') { bindOptions.address = server4.xxlocal; }
server4.bind(bindOptions, function () {
try {
var doscan = true;
try { this.setBroadcast(true); this.setMulticastTTL(128); this.addMembership(membershipIPv4, this.xxlocal); } catch (e) { doscan = false; }
this.on('error', function (error) { console.log('Error: ' + error); });
this.on('message', function (msg, info) { onUdpPacket(msg, info, this); });
if (doscan == true) { obj.performScan(this); obj.performScan(this); }
} catch (e) { console.log(e); }
});
obj.servers4[localAddress] = server4;
} catch (e) {
console.log(e);
}
}
}
for (i in addresses.ipv6) {
localAddress = addresses.ipv6[i];
if (obj.servers6[localAddress] != null) {
// Server already exists
obj.servers6[localAddress].xxclear = false;
} else {
// Create a new IPv6 server
try {
var server6 = obj.dgram.createSocket({ type: 'udp6', reuseAddr: true });
server6.xxclear = false;
server6.xxtype = 6;
server6.xxlocal = localAddress;
server6.on('error', function (err) { this.close(); delete obj.servers6[this.xxlocal]; });
bindOptions = { port: 16989, exclusive: true };
if (server6.xxlocal != '*') { bindOptions.address = server6.xxlocal; }
server6.bind(bindOptions, function () {
try {
var doscan = true;
try { this.setBroadcast(true); this.setMulticastTTL(128); this.addMembership(membershipIPv6, this.xxlocal); } catch (e) { doscan = false; }
this.on('error', function (error) { console.log('Error: ' + error); });
this.on('message', function (msg, info) { onUdpPacket(msg, info, this); });
if (doscan == true) { obj.performScan(this); obj.performScan(this); }
} catch (e) { console.log(e); }
});
obj.servers6[localAddress] = server6;
} catch (e) {
console.log(e);
}
}
}
for (i in obj.servers4) { if (obj.servers4[i].xxclear == true) { obj.servers4[i].close(); delete obj.servers4[i]; } }
for (i in obj.servers6) { if (obj.servers6[i].xxclear == true) { obj.servers6[i].close(); delete obj.servers6[i]; } }
}
// Clear all IPv4 and IPv6 servers
function clearServers() {
var i;
for (i in obj.servers4) { obj.servers4[i].close(); delete obj.servers4[i]; }
for (i in obj.servers6) { obj.servers6[i].close(); delete obj.servers6[i]; }
}
// Start scanning for local network Mesh Agents
obj.start = function () {
if (obj.server4 != null) return;
// Setup the local discovery values
var name = 'MeshCentral';
var info = '';
try {
if ((typeof obj.parent.config.domains[''].title == 'string') && (obj.parent.config.domains[''].title.length > 0)) {
name = obj.parent.config.domains[''].title; info = '';
try { if ((typeof obj.parent.config.domains[''].title2 == 'string') && (obj.parent.config.domains[''].title2.length > 0)) { info = obj.parent.config.domains[''].title2; } } catch (ex) { }
}
} catch (ex) { }
try {
if ((typeof obj.parent.args.localdiscovery.name == 'string') && (obj.parent.args.localdiscovery.name.length > 0)) {
name = obj.parent.args.localdiscovery.name; info = '';
try { if ((typeof obj.parent.args.localdiscovery.info == 'string') && (obj.parent.args.localdiscovery.info.length > 0)) { info = obj.parent.args.localdiscovery.info; } } catch (ex) { }
}
} catch (ex) { }
if (info == '') { info = parent.certificates.CommonName; }
// Figure out the correct websocket port
var port = (parent.args.aliasport)?parent.args.aliasport:parent.args.port;
// Build the IPv4 response
var url = (parent.args.notls ? 'ws' : 'wss') + '://%s:' + port + '/agent.ashx';
obj.multicastPacket4 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, 'ascii');
if (parent.certificates.CommonName.indexOf('.') != -1) { url = (parent.args.notls ? 'ws' : 'wss') + '://' + parent.certificates.CommonName + ':' + port + '/agent.ashx'; }
obj.multicastPacket4x = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url + '|' + name + '|' + info, 'ascii');
// Build the IPv6 response
url = (parent.args.notls ? 'ws' : 'wss') + '://[%s]:' + port + '/agent.ashx';
obj.multicastPacket6 = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url, 'ascii');
if (parent.certificates.CommonName.indexOf('.') != -1) { url = (parent.args.notls ? 'ws' : 'wss') + '://' + parent.certificates.CommonName + ':' + port + '/agent.ashx'; }
obj.multicastPacket6x = Buffer.from("MeshCentral2|" + obj.agentCertificateHashHex + '|' + url + '|' + name + '|' + info, 'ascii');
setupServers();
obj.mainTimer = setInterval(obj.performScan, periodicScanTime);
return obj;
};
// Stop scanning for local network Mesh Agents
obj.stop = function () {
if (obj.mainTimer != null) { clearInterval(obj.mainTimer); obj.mainTimer = null; }
clearServers();
};
// Look for all Mesh Agents that may be locally reachable, indicating the presense of this server.
obj.performScan = function (server) {
var i;
if (server != null) {
if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, 16990, membershipIPv4); } catch (e) { } }
if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, 16990, membershipIPv6); } catch (e) { } }
if ((server.xxtype == 4) && (server.xxlocal == '*')) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, 16990, '127.0.0.1'); } catch (e) { } try { server.send(p, 0, p.length, 16990, '255.255.255.255'); } catch (e) { } }
if ((server.xxtype == 6) && (server.xxlocal == '*')) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, 16990, '::1'); } catch (e) { } }
} else {
for (i in obj.servers4) { var p = encryptPacket(obj.multicastPacket4); try { obj.servers4[i].send(p, 0, p.length, 16990, membershipIPv4); } catch (e) { } }
for (i in obj.servers6) { var p = encryptPacket(obj.multicastPacket6); try { obj.servers6[i].send(p, 0, p.length, 16990, membershipIPv6); } catch (e) { } }
setupServers(); // Check if any network interfaces where added or removed
}
};
// Called when a UDP packet is received from an agent.
function onUdpPacket(msg, info, server) {
// Decrypt the packet if needed
if ((msg = decryptPacket(msg)) == null) return;
//console.log('Received ' + msg.length + ' bytes from ' + info.address + ':' + info.port + ', on interface: ' + server.xxlocal + '.');
if ((msg.length == 96) && (msg.toString('ascii') == obj.agentCertificateHashHex)) {
if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
} else if (msg.toString('ascii') == 'MeshServerScan') {
if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4x); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6x); try { server.send(p, 0, p.length, info.port, info.address); } catch (e) { } }
}
}
// As a side job, we also send server wake-on-lan packets
obj.wakeOnLan = function (macs) {
var i, j;
for (i in macs) {
var mac = macs[i];
var hexpacket = 'FFFFFFFFFFFF';
for (j = 0; j < 16; j++) { hexpacket += mac; }
var wakepacket = Buffer.from(hexpacket, 'hex');
//console.log(wakepacket.toString('hex'));
// Send the wake packet 3 times with small time intervals
for (j in obj.servers4) { obj.servers4[j].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
for (j in obj.servers6) { obj.servers6[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
setTimeout(function () {
for (j in obj.servers4) { obj.servers4[j].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
for (j in obj.servers6) { obj.servers6[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
}, 200);
setTimeout(function () {
for (j in obj.servers4) { obj.servers4[j].send(wakepacket, 0, wakepacket.length, 7, "255.255.255.255"); obj.servers4[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv4); }
for (j in obj.servers6) { obj.servers6[j].send(wakepacket, 0, wakepacket.length, 16990, membershipIPv6); }
}, 500);
}
};
return obj;
};