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MeshCentral/swarmserver.js

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/**
* @description MeshCentral v1 legacy Swarm Server, used to update agents and get them on MeshCentral2
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018-2022
* @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 legacy Swarm Server server object
module.exports.CreateSwarmServer = function (parent, db, args, certificates) {
var obj = {};
obj.parent = parent;
obj.db = db;
obj.args = args;
obj.certificates = certificates;
obj.legacyAgentConnections = {};
obj.migrationAgents = {};
obj.agentActionCount = {};
obj.stats = { blockedConnect: 0, connectCount: 0, clientCertConnectCount: 0, noCertConnectCount: 0, bytesIn: 0, bytesOut: 0, httpGetRequest: 0, pushedAgents: {}, close: 0, onclose: 0, agentType: {} }
const tls = require('tls');
const forge = require('node-forge');
const common = require('./common.js');
const LegacyMeshProtocol = {
NODEPUSH: 1, // Used to send a node block to another peer.
NODEPULL: 2, // Used to send a pull block to another peer.
NODENOTIFY: 3, // Used to indicate the node ID to other peers.
NODECHALLENGE: 4, // Used to challenge a node identity.
NODECRESPONSE: 5, // Used to respond to a node challenge.
TARGETSTATUS: 6, // Used to send the peer connection status list.
LOCALEVENT: 7, // Used to send local events to subscribers.
AESCRYPTO: 8, // Used to send an encrypted block of data.
SESSIONKEY: 9, // Used to send a session key to a remote node.
SYNCSTART: 10, // Used to send kick off the SYNC request, send the start NodeID.
SYNCMETADATA: 11, // Used to send a sequence of NodeID & serial numbers.
SYNCREQUEST: 12, // Used to send a sequence of NodeID's to request.
NODEID: 13, // Used to send the NodeID in the clear. Used for multicast.
AGENTID: 14, // Used to send the AgentID & version to the other node.
PING: 15, // Used to query a target for the presence of the mesh agent (PB_NODEID response expected).
SETUPADMIN: 16, // Used to set the trusted mesh identifier, this code can only be used from local settings file.
POLICY: 17, // Used to send a policy block to another peer.
POLICYSECRET: 18, // Used to encode the PKCS12 private key of a policy block.
EVENTMASK: 19, // Used by the mesh service to change the event mask.
RECONNECT: 20, // Used by the mesh service to indicate disconnect & reconnection after n seconds.
GETSTATE: 21, // Used by the mesh service to obtain agent state.
CERTENCRYPTED: 22, // Used to send a certificate encrypted message to a node.
GETCOOKIE: 23, // Used to request a certificate encryption anti-replay cookie.
COOKIE: 24, // Used to carry an anti-replay cookie to a requestor.
SESSIONCKEY: 25, // Used to send a session key to a remote console.
INTERFACE: 26, // Used to send a local interface blob to a management console.
MULTICAST: 27, // Used by the mesh service to cause the agent to send a multicast.
SELFEXE: 28, // Used to transfer our own agent executable.
LEADERBADGE: 29, // User to send a leadership badge.
NODEINFO: 30, // Used to indicate a block information update to the web service.
TARGETEVENT: 31, // Used to send a single target update event.
DEBUG: 33, // Used to send debug information to web service.
TCPRELAY: 34, // Used to operate mesh leader TCP relay sockets
CERTSIGNED: 35, // Used to send a certificate signed message to a node.
ERRORCODE: 36, // Used to notify of an error.
MESSAGE: 37, // Used to route messages between nodes.
CMESSAGE: 38, // Used to embed a interface identifier along with a PB_MESSAGE.
EMESSAGE: 39, // Used to embed a target encryption certificate along with a MESSAGE or CMESSAGE.
SEARCH: 40, // Used to send a custom search to one or more remote nodes.
MESSAGERELAY: 41, // Used by no-certificate consoles to send hopping messages to nodes.
USERINPUT: 42, // Used to send user keyboard input to a target computer
APPID: 43, // Used to send a block of data to a specific application identifier.
APPSUBSCRIBE: 44, // Used to perform local app subscription to an agent.
APPDIRECT: 45, // Used to send message directly to remote applications.
APPREQACK: 46, // Used to request an ack message.
APPACK: 47, // Used to ack a received message.
SERVERECHO: 48, // Server will echo this message, used for testing.
KVMINFO: 49, // Used to send local KVM secondary process information to mesh agent.
REMOTEWAKE: 50, // Used to send remote wake information to server.
NEWCONNECTTOKEN: 51, // Used to send a new connection token to the Swarm Server.
WIFISCAN: 52, // Used to send visible WIFI AP's to the server.
AMTPROVISIONING: 53, // Used by the agent to send Intel AMT provisioning information to the server.
ANDROIDCOMMAND: 54, // Send a Android OS specific command (Android only).
NODEAPPDATA: 55, // Used to send application specific data block to the server for storage.
PROXY: 56, // Used to indicate the currently used proxy setting string.
FILEOPERATION: 57, // Used to perform short file operations.
APPSUBSCRIBERS: 58, // Used request and send to the mesh server the list of subscribed applications
CUSTOM: 100, // Message containing application specific data.
USERAUTH: 1000, // Authenticate a user to the swarm server.
USERMESH: 1001, // Request or return the mesh list for this console.
USERMESHS: 1002, // Send mesh overview information to the console.
USERNODES: 1003, // Send node overview information to the console.
JUSERMESHS: 1004, // Send mesh overview information to the console in JSON format.
JUSERNODES: 1005, // Send node overview information to the console in JSON format.
USERPOWERSTATE: 1006, // Used to send a power command from the console to the server.
JMESHPOWERTIMELINE: 1007, // Send the power timeline for all nodes in a mesh.
JMESHPOWERSUMMARY: 1008, // Send the power summary for sum of all nodes in a mesh.
USERCOMMAND: 1009, // Send a user admin text command to and from the server.
POWERBLOCK: 1010, // Request/Response of block of power state information.
MESHACCESSCHANGE: 1011, // Notify a console of a change in accessible meshes.
COOKIEAUTH: 1012, // Authenticate a user using a crypto cookie.
NODESTATECHANGE: 1013, // Indicates a node has changed power state.
JUSERNODE: 1014, // Send node overview information to the console in JSON format.
AMTWSMANEVENT: 1015, // Intel AMT WSMAN event sent to consoles.
ROUTINGCOOKIE: 1016, // Used by a console to request a routing cookie.
JCOLLABORATION: 1017, // Request/send back JSON collaboration state.
JRELATIONS: 1018, // Request/send back JSON relations state.
SETCOLLABSTATE: 1019, // Set the collaboration state for this session.
ADDRELATION: 1020, // Request that a new relation be added.
DELETERELATION: 1021, // Request a relation be deleted.
ACCEPTRELATION: 1022, // Request relation invitation be accepted.
RELATIONCHANGEEVENT: 1023, // Notify that a relation has changed.
COLLBCHANGEEVENT: 1024, // Notify that a collaboration state has change.
MULTICONSOLEMESSAGE: 1025, // Send a message to one or more console id's.
CONSOLEID: 1026, // Notify a console of it's console id.
CHANGERELATIONDATA: 1027, // Request that relation data be changed.
SETUSERDATA: 1028, // Set user data
GETUSERDATA: 1029, // Get user data
SERVERAUTH: 1030, // Used to verify the certificate of the server
USERAUTH2: 1031, // Authenticate a user to the swarm server (Uses SHA1 SALT)
GUESTREMOTEDESKTOP: 2001, // Guest usage: Remote Desktop
GUESTWEBRTCMESH: 2002 // Guest usage: WebRTC Mesh
};
obj.server = tls.createServer({ key: certificates.swarmserver.key, cert: certificates.swarmserver.cert, requestCert: true, rejectUnauthorized: false }, onConnection);
obj.server.listen(args.swarmport, function () { console.log('MeshCentral Legacy Swarm Server running on ' + certificates.CommonName + ':' + args.swarmport + '.'); obj.parent.updateServerState('swarm-port', args.swarmport); }).on('error', function (err) { console.error('ERROR: MeshCentral Swarm Server server port ' + args.swarmport + ' is not available.'); if (args.exactports) { process.exit(); } });
loadMigrationAgents();
// Load all migration agents along with full executable in memory
function loadMigrationAgents() {
var migrationAgentsDir = null, migrationAgentsPath = obj.parent.path.join(obj.parent.datapath, 'migrationagents');
try { migrationAgentsDir = obj.parent.fs.readdirSync(migrationAgentsPath); } catch (e) { }
if (migrationAgentsDir != null) {
for (var i in migrationAgentsDir) {
if (migrationAgentsDir[i].toLowerCase().startsWith('meshagent-')) {
var migrationAgentName = obj.parent.path.join(migrationAgentsPath, migrationAgentsDir[i]);
var agentInfo = migrationAgentsDir[i].substring(10).split('.');
var agentVersion = parseInt(agentInfo[0]);
var agentArch = parseInt(agentInfo[1]);
if (obj.migrationAgents[agentArch] == null) { obj.migrationAgents[agentArch] = {}; }
if (obj.migrationAgents[agentArch][agentVersion] == null) { obj.migrationAgents[agentArch][agentVersion] = { arch: agentArch, ver: agentVersion, path: migrationAgentName }; }
}
}
}
}
function onData(data) {
if (this.relaySocket) { var ps = this; try { this.relaySocket.write(data, 'binary', function () { ps.resume(); }); } catch (ex) { } return; }
if (args.swarmdebug) { var buf = Buffer.from(data, "binary"); console.log('SWARM <-- (' + buf.length + '):' + buf.toString('hex')); } // Print out received bytes
obj.stats.bytesIn += data.length;
this.tag.accumulator += data;
// Detect if this is an HTTPS request, if it is, return a simple answer and disconnect. This is useful for debugging access to the MPS port.
if (this.tag.first == true) {
if (this.tag.accumulator.length < 3) return;
if ((this.tag.accumulator.substring(0, 3) == 'GET') || (this.tag.accumulator.substring(0, 3) == 'POS')) {
obj.stats.httpGetRequest++;
/*console.log("Swarm Connection, HTTP GET detected: " + socket.remoteAddress);*/
//socket.write('HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n<!DOCTYPE html><html><head><meta charset="UTF-8"></head><body>MeshCentral2 legacy swarm server.<br />MeshCentral1 mesh agents should connect here for updates.</body></html>');
//socket.end();
// Relay this connection to the main TLS port
this.pause();
var relaySocket = tls.connect(obj.args.port, { rejectUnauthorized: false }, function () { this.write(this.parentSocket.tag.accumulator); this.parentSocket.resume(); });
relaySocket.on('data', function (data) { try { var rs = this; this.pause(); this.parentSocket.write(data, 'binary', function () { rs.resume(); }); } catch (ex) { } });
relaySocket.on('error', function (err) { try { this.parentSocket.end(); } catch (ex) { } });
relaySocket.on('end', function () { try { this.parentSocket.end(); } catch (ex) { } });
this.relaySocket = relaySocket;
relaySocket.parentSocket = this;
return;
}
this.tag.first = false;
}
// A client certificate is required
if ((this.tag.clientCert == null) || (this.tag.clientCert.subject == null)) {
/*console.log("Swarm Connection, no client cert: " + socket.remoteAddress);*/
this.write('HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nMeshCentral2 legacy swarm server.\r\nNo client certificate given.');
//this.end(); // If we don't close the connection, it may lead to less reconnection traffic.
return;
}
try {
// Parse all of the agent binary command data we can
var l = 0;
do { l = ProcessCommand(this); if (l > 0) { this.tag.accumulator = this.tag.accumulator.substring(l); } } while (l > 0);
if (l < 0) { this.end(); }
} catch (e) {
console.log(e);
}
}
// Process one AFP command
function ProcessCommand(socket) {
if (socket.tag.accumulator.length < 4) return 0;
var cmd = common.ReadShort(socket.tag.accumulator, 0);
var len = common.ReadShort(socket.tag.accumulator, 2);
if (len > socket.tag.accumulator.length) return 0;
var data = socket.tag.accumulator.substring(4, len);
//console.log('Swarm: Cmd=' + cmd + ', Len=' + len + '.');
switch (cmd) {
case LegacyMeshProtocol.NODEPUSH: {
parent.debug('swarmcmd', 'NODEPUSH');
var nodeblock = obj.decodeNodeBlock(data);
if ((nodeblock != null) && (nodeblock.agenttype != null) && (nodeblock.agentversion != null)) {
if (socket.pingTimer == null) { socket.pingTimer = setInterval(function () { obj.SendCommand(socket, LegacyMeshProtocol.PING); }, 20000); }
parent.debug('swarmcmd', 'NODEPUSH:' + JSON.stringify(nodeblock));
// Log the agent type
if (obj.stats.agenttype[nodeblock.agenttype] == null) { obj.stats.agenttype[nodeblock.agenttype] = 1; } else { obj.stats.agenttype[nodeblock.agenttype]++; }
// Check if this agent is asking of updates over and over again.
var actionCount = obj.agentActionCount[nodeblock.nodeidhex];
if (actionCount == null) { actionCount = 0; }
if (actionCount > 2) {
// Already tried to update this agent two times, something is not right.
//console.log('SWARM: ' + actionCount + ' update actions on ' + nodeblock.nodeidhex + ', holding.');
} else {
// Figure out what is the next agent version we need.
var nextAgentVersion = 0;
if (nodeblock.agentversion < 201) { nextAgentVersion = 201; } // If less then 201, move to transitional MC1 agent.
if (nodeblock.agentversion == 201) { nextAgentVersion = 202; } // If at 201, move to first MC2 agent.
// See if we need to start the agent update
if ((nextAgentVersion > 0) && (obj.migrationAgents[nodeblock.agenttype] != null) && (obj.migrationAgents[nodeblock.agenttype][nextAgentVersion] != null)) {
// Start the update
socket.tag.update = obj.migrationAgents[nodeblock.agenttype][nextAgentVersion];
socket.tag.updatePtr = 0;
//console.log('Performing legacy agent update from ' + nodeblock.agentversion + '.' + nodeblock.agenttype + ' to ' + socket.tag.update.ver + '.' + socket.tag.update.arch + ' on ' + nodeblock.agentname + '.');
// Update stats
if (obj.stats.pushedAgents[nodeblock.agenttype] == null) { obj.stats.pushedAgents[nodeblock.agenttype] = {}; }
if (obj.stats.pushedAgents[nodeblock.agenttype][nextAgentVersion] == null) { obj.stats.pushedAgents[nodeblock.agenttype][nextAgentVersion] = 1; } else { obj.stats.pushedAgents[nodeblock.agenttype][nextAgentVersion]++; }
// Start the agent download using the task limiter so not to flood the server. Low priority task
obj.parent.taskLimiter.launch(function (socket, taskid, taskLimiterQueue) {
if (socket.xclosed == 1) {
// Socket is closed, do nothing
obj.parent.taskLimiter.completed(taskid); // Indicate this task complete
} else {
// Start the agent update
socket.tag.taskid = taskid;
obj.SendCommand(socket, LegacyMeshProtocol.GETSTATE, common.IntToStr(5) + common.IntToStr(0)); // agent.SendQuery(5, 0); // Start the agent download
}
}, socket, 2);
} else {
//console.log('No legacy agent update for ' + nodeblock.agentversion + '.' + nodeblock.agenttype + ' on ' + nodeblock.agentname + '.');
}
}
// Mark this agent
obj.agentActionCount[nodeblock.nodeidhex] = ++actionCount;
}
break;
}
case LegacyMeshProtocol.AMTPROVISIONING: {
parent.debug('swarmcmd', 'AMTPROVISIONING');
obj.SendCommand(socket, LegacyMeshProtocol.AMTPROVISIONING, common.ShortToStr(1));
break;
}
case LegacyMeshProtocol.GETSTATE: {
parent.debug('swarmcmd', 'GETSTATE');
if (len < 12) break;
var statecmd = common.ReadInt(data, 0);
//var statesync = common.ReadInt(data, 4);
switch (statecmd) {
case 6: { // Ask for agent block
if (socket.tag.update != null) {
// Send an agent block
if (socket.tag.update.binary == null) { socket.tag.update.binary = obj.parent.fs.readFileSync(socket.tag.update.path); }
var l = Math.min(socket.tag.update.binary.length - socket.tag.updatePtr, 16384);
obj.SendCommand(socket, LegacyMeshProtocol.GETSTATE, common.IntToStr(6) + common.IntToStr(socket.tag.updatePtr) + socket.tag.update.binary.toString('binary', socket.tag.updatePtr, socket.tag.updatePtr + l)); // agent.SendQuery(6, AgentFileLen + AgentBlock);
parent.debug('swarmcmd', 'Sending agent block, ptr = ' + socket.tag.updatePtr + ', len = ' + l);
socket.tag.updatePtr += l;
if (socket.tag.updatePtr >= socket.tag.update.binary.length) {
// Send end-of-transfer
obj.SendCommand(socket, LegacyMeshProtocol.GETSTATE, common.IntToStr(7) + common.IntToStr(socket.tag.update.binary.length)); //agent.SendQuery(7, AgentFileLen);
parent.debug('swarmcmd', 'Sending end of agent, ptr = ' + socket.tag.updatePtr);
obj.parent.taskLimiter.completed(socket.tag.taskid); // Indicate this task complete
delete socket.tag.taskid;
delete socket.tag.update;
delete socket.tag.updatePtr;
}
}
break;
}
default: {
// All other state commands from the legacy agent must be ignored.
break;
}
}
break;
}
case LegacyMeshProtocol.APPSUBSCRIBERS: {
parent.debug('swarmcmd', 'APPSUBSCRIBERS');
break;
}
default: {
parent.debug('swarmcmd', 'Unknown command: ' + cmd + ' of len ' + len + '.');
}
}
return len;
}
// Called when a legacy agent connects to this server
function onConnection(socket) {
// Check for blocked IP address
if (checkSwarmIpAddress(socket, obj.args.swarmallowedip) == false) { obj.stats.blockedConnect++; parent.debug('swarm', "New blocked agent connection"); return; }
obj.stats.connectCount++;
socket.tag = { first: true, clientCert: socket.getPeerCertificate(true), accumulator: "" };
parent.debug('swarm', 'New legacy agent connection');
if ((socket.tag.clientCert == null) || (socket.tag.clientCert.subject == null)) { obj.stats.noCertConnectCount++; } else { obj.stats.clientCertConnectCount++; }
socket.addListener("data", onData);
socket.addListener("close", function () {
obj.stats.onclose++;
parent.debug('swarm', 'Connection closed');
// Perform aggressive cleanup
if (this.relaySocket) { try { this.relaySocket.end(); this.relaySocket.removeAllListeners(["data", "end", "error"]); delete this.relaySocket; } catch (ex) { } }
if (this.pingTimer != null) { clearInterval(this.pingTimer); delete this.pingTimer; }
if (this.tag && (typeof this.tag.taskid == 'number')) {
obj.parent.taskLimiter.completed(this.tag.taskid); // Indicate this task complete
delete this.tag.taskid;
}
if (this.tag) {
if (this.tag.accumulator) { delete this.tag.accumulator; }
if (this.tag.clientCert) { delete this.tag.clientCert; }
delete this.tag;
}
this.removeAllListeners([ "data", "close", "error" ]);
});
socket.addListener("error", function () {
//console.log("Swarm Error: " + socket.remoteAddress);
});
}
function getTagClass(data, tagClass, type) {
if ((data == null) || (data.value == null)) return;
for (var i in data.value) {
//console.log(JSON.stringify(data.value[i]));
if ((data.value[i].tagClass == tagClass) && (data.value[i].type == type)) {
return data.value[i];
}
}
}
// Decode a node push block
obj.decodeNodeBlock = function (data) {
try {
// Traverse the DER to get the raw data (Not sure if this works all the time)
var info = {}, ptr = 68, der = forge.asn1.fromDer(forge.util.createBuffer(data, 'binary'));
der = getTagClass(der, 128, 0);
der = getTagClass(der, 0, 16);
der = getTagClass(der, 0, 16);
der = getTagClass(der, 128, 0);
der = getTagClass(der, 0, 4);
var binarydata = der.value;
// Get the basic header values
info.certhashhex = common.rstr2hex(binarydata.substring(0, 32)); // Hash of the complete mesh agent certificate
info.nodeidhex = common.rstr2hex(binarydata.substring(32, 64)); // Old mesh agent nodeid
info.serialNumber = common.ReadIntX(binarydata, 64); // Block serial number
// Got thru the sub-blocks
while (ptr < binarydata.length) {
var btyp = common.ReadShort(binarydata, ptr), blen = common.ReadShort(binarydata, ptr + 2), bdata = binarydata.substring(ptr + 4, ptr + 4 + blen);
switch (btyp) {
case 1: { // PBST_COMPUTERINFO
info.agenttype = common.ReadShortX(bdata, 0);
info.agentbuild = common.ReadShortX(bdata, 2);
info.agentversion = common.ReadIntX(bdata, 4);
info.agentname = bdata.substring(8, 64 + 8);
var xx = info.agentname.indexOf('\u0000');
if (xx >= 0) { info.agentname = info.agentname.substring(0, xx); }
info.agentosdesc = bdata.substring(64 + 8, 64 + 64 + 8);
xx = info.agentosdesc.indexOf('\u0000');
if (xx >= 0) { info.agentosdesc = info.agentosdesc.substring(0, xx); }
return info;
}
default: {
// All other commands from the legacy agent must be ignored.
break;
}
}
ptr += blen;
}
return info;
} catch (e) { }
return null;
};
// Disconnect legacy agent connection
obj.close = function (socket) {
obj.stats.close++;
try { socket.close(); } catch (e) { }
socket.xclosed = 1;
};
obj.SendCommand = function (socket, cmdid, data) {
if (data == null) { data = ''; }
Write(socket, common.ShortToStr(cmdid) + common.ShortToStr(data.length + 4) + data);
};
function Write(socket, data) {
obj.stats.bytesOut += data.length;
if (args.swarmdebug) {
// Print out sent bytes
var buf = Buffer.from(data, "binary");
console.log('SWARM --> (' + buf.length + '):' + buf.toString('hex'));
socket.write(buf);
} else {
socket.write(Buffer.from(data, "binary"));
}
}
// Check if the source IP address is allowed for a given allowed list, return false if not
function checkSwarmIpAddress(socket, allowedIpList) {
if (allowedIpList == null) { return true; }
try {
var ip = socket.remoteAddress;
if (ip) { for (var i = 0; i < allowedIpList.length; i++) { if (require('ipcheck').match(ip, allowedIpList[i])) { return true; } } }
} catch (e) { console.log(e); }
return false;
}
return obj;
};
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