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Added discovery key support.

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This commit is contained in:
Ylian Saint-Hilaire 2020-07-14 15:39:14 -07:00
parent 4943dd4f6d
commit c2ad26419a
3 changed files with 55 additions and 18 deletions
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2
db.js
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@ -660,7 +660,7 @@ module.exports.CreateDB = function (parent, func) {
// If a DB encryption key is provided, perform database encryption
if ((typeof parent.args.dbencryptkey == 'string') && (parent.args.dbencryptkey.length != 0)) {
// Hash the database password into a AES256 key and setup encryption and decryption.
obj.dbKey = parent.crypto.createHash('sha384').update(parent.args.dbencryptkey).digest("raw").slice(0, 32);
obj.dbKey = parent.crypto.createHash('sha384').update(parent.args.dbencryptkey).digest('raw').slice(0, 32);
datastoreOptions.afterSerialization = function (plaintext) {
const iv = parent.crypto.randomBytes(16);
const aes = parent.crypto.createCipheriv('aes-256-cbc', obj.dbKey, iv);

4
meshcentral-config-schema.json
View File

@ -18,7 +18,6 @@
"sessionKey": { "type": "string" },
"sessionSameSite": { "type": "string" },
"dbEncryptKey": { "type": "string" },
"multicastKey": { "type": "string", "description": "When set, encrypts all multicast LAN traffic to agents using this key. This is only useful in LAN mode when agents and tools will multicast to find the server." },
"dbRecordsEncryptKey": { "type": "string" },
"dbRecordsDecryptKey": { "type": "string" },
"dbExpire": {
@ -75,7 +74,8 @@
"additionalProperties": false,
"properties": {
"name": { "type": "string" },
"info": { "type": "string" }
"info": { "type": "string" },
"key": { "type": "string", "description": "When set, encrypts all LAN discovery traffic to agents and tools using this key. This is only useful in LAN/Hybrid mode when agents and tools user multicast to find the server." }
},
"required": [ "name", "info" ]
},

67
meshscanner.js
View File

@ -29,6 +29,31 @@ module.exports.CreateMeshScanner = function (parent) {
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;
@ -131,11 +156,20 @@ module.exports.CreateMeshScanner = function (parent) {
// Setup the local discovery values
var name = 'MeshCentral';
try { name = obj.parent.config.domains[''].title; } catch (ex) { }
try { name = obj.parent.args.localdiscovery.name; } catch (ex) { }
var info = 'Beta2';
try { info = obj.parent.config.domains[''].title2; } catch (ex) { }
try { info = obj.parent.args.localdiscovery.info; } catch (ex) { }
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;
@ -167,26 +201,29 @@ module.exports.CreateMeshScanner = function (parent) {
obj.performScan = function (server) {
var i;
if (server != null) {
if (server.xxtype == 4) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); } catch (e) { } }
if (server.xxtype == 6) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, membershipIPv6); } catch (e) { } }
if ((server.xxtype == 4) && (server.xxlocal == '*')) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, '127.0.0.1'); } catch (e) { } try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, '255.255.255.255'); } catch (e) { } }
if ((server.xxtype == 6) && (server.xxlocal == '*')) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, '::1'); } catch (e) { } }
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) { try { obj.servers4[i].send(obj.multicastPacket4, 0, obj.multicastPacket4.length, 16990, membershipIPv4); } catch (e) { } }
for (i in obj.servers6) { try { obj.servers6[i].send(obj.multicastPacket6, 0, obj.multicastPacket6.length, 16990, membershipIPv6); } catch (e) { } }
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) { try { server.send(obj.multicastPacket4, 0, obj.multicastPacket4.length, info.port, info.address); } catch (e) { } }
if (server.xxtype == 6) { try { server.send(obj.multicastPacket6, 0, obj.multicastPacket6.length, info.port, info.address); } catch (e) { } }
if (server.xxtype == 4) { var p = encryptPacket(obj.multicastPacket4); try { server.send(p, 0, p, info.port, info.address); } catch (e) { } }
if (server.xxtype == 6) { var p = encryptPacket(obj.multicastPacket6); try { server.send(p, 0, p, info.port, info.address); } catch (e) { } }
} else if (msg.toString('ascii') == 'MeshServerScan') {
if (server.xxtype == 4) { try { server.send(obj.multicastPacket4x, 0, obj.multicastPacket4x.length, info.port, info.address); } catch (e) { } }
if (server.xxtype == 6) { try { server.send(obj.multicastPacket6x, 0, obj.multicastPacket6x.length, info.port, info.address); } catch (e) { } }
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) { } }
}
}