mirror of
https://github.com/Ylianst/MeshCentral.git
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217 lines
11 KiB
JavaScript
217 lines
11 KiB
JavaScript
/**
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* @description MeshCentral connection relay module
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018
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* @license Apache-2.0
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* @version v0.0.1
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*/
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module.exports.CreateMeshRelay = function (parent, ws, req, domain) {
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var obj = {};
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obj.ws = ws;
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obj.req = req;
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obj.peer = null;
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obj.parent = parent;
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obj.id = req.query.id;
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obj.remoteaddr = obj.ws._socket.remoteAddress;
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obj.domain = domain;
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if (obj.remoteaddr.startsWith('::ffff:')) { obj.remoteaddr = obj.remoteaddr.substring(7); }
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// Disconnect this agent
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obj.close = function (arg) {
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if ((arg == 1) || (arg == null)) { try { obj.ws.close(); obj.parent.parent.debug(1, 'Relay: Soft disconnect (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Soft close, close the websocket
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if (arg == 2) { try { obj.ws._socket._parent.end(); obj.parent.parent.debug(1, 'Relay: Hard disconnect (' + obj.remoteaddr + ')'); } catch (e) { console.log(e); } } // Hard close, close the TCP socket
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}
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obj.sendAgentMessage = function (command, userid, domainid) {
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if (command.nodeid == null) return false;
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var user = obj.parent.users[userid];
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if (user == null) return false;
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var splitnodeid = command.nodeid.split('/');
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// Check that we are in the same domain and the user has rights over this node.
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if ((splitnodeid[0] == 'node') && (splitnodeid[1] == domainid)) {
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// Get the user object
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// See if the node is connected
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var agent = obj.parent.wsagents[command.nodeid];
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if (agent != null) {
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// Check if we have permission to send a message to that node
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var rights = user.links[agent.dbMeshKey];
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if (rights != null || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking
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command.sessionid = ws.sessionId; // Set the session id, required for responses.
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command.rights = rights.rights; // Add user rights flags to the message
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delete command.nodeid; // Remove the nodeid since it's implyed.
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agent.send(JSON.stringify(command));
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return true;
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}
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} else {
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// Check if a peer server is connected to this agent
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var routing = obj.parent.parent.GetRoutingServerId(command.nodeid, 1); // 1 = MeshAgent routing type
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if (routing != null) {
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// Check if we have permission to send a message to that node
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var rights = user.links[routing.meshid];
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if (rights != null || ((rights & 16) != 0)) { // TODO: 16 is console permission, may need more gradular permission checking
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command.fromSessionid = ws.sessionId; // Set the session id, required for responses.
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command.rights = rights.rights; // Add user rights flags to the message
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obj.parent.parent.multiServer.DispatchMessageSingleServer(command, routing.serverid);
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return true;
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}
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}
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}
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}
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return false;
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}
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if (req.query.auth == null) {
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// Use ExpressJS session, check if this session is a logged in user, at least one of the two connections will need to be authenticated.
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try { if ((req.session) && (req.session.userid) || (req.session.domainid == obj.domain.id)) { obj.authenticated = true; } } catch (e) { }
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if ((obj.authenticated != true) && (req.query.user != null) && (req.query.pass != null)) {
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// Check user authentication
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obj.parent.authenticate(req.query.user, req.query.pass, obj.domain, function (err, userid, passhint) {
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if (userid != null) {
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obj.authenticated = true;
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// Check if we have agent routing instructions, process this here.
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if ((req.query.nodeid != null) && (req.query.tcpport != null)) {
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if (obj.id == undefined) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one.
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var command = { nodeid: req.query.nodeid, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id, tcpport: req.query.tcpport, tcpaddr: ((req.query.tcpaddr == null) ? '127.0.0.1' : req.query.tcpaddr) };
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if (obj.sendAgentMessage(command, userid, obj.domain.id) == false) { obj.id = null; obj.parent.parent.debug(1, 'Relay: Unable to contact this agent (' + obj.remoteaddr + ')'); }
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}
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} else {
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obj.parent.parent.debug(1, 'Relay: User authentication failed (' + obj.remoteaddr + ')');
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obj.ws.send('error:Authentication failed');
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}
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performRelay();
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});
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} else {
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performRelay();
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}
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} else {
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// Get the session from the cookie
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var cookie = obj.parent.parent.decodeCookie(req.query.auth);
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if (cookie != null) {
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obj.authenticated = true;
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if (cookie.tcpport != null) {
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// This cookie has agent routing instructions, process this here.
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if (obj.id == undefined) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one.
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// Send connection request to agent
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var command = { nodeid: cookie.nodeid, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id, tcpport: cookie.tcpport, tcpaddr: cookie.tcpaddr };
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if (obj.sendAgentMessage(command, cookie.userid, cookie.domainid) == false) { obj.id = null; obj.parent.parent.debug(1, 'Relay: Unable to contact this agent (' + obj.remoteaddr + ')'); }
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}
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} else {
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obj.id = null;
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obj.parent.parent.debug(1, 'Relay: invalid cookie (' + obj.remoteaddr + ')');
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obj.ws.send('error:Invalid cookie');
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}
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performRelay();
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}
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function performRelay() {
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if (obj.id == null) { try { obj.close(); } catch (e) { } return null; } // Attempt to connect without id, drop this.
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ws._socket.setKeepAlive(true, 240000); // Set TCP keep alive
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// Validate that the id is valid, we only need to do this on non-authenticated sessions.
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// TODO: Figure out when this needs to be done.
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/*
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if (!parent.args.notls) {
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// Check the identifier, if running without TLS, skip this.
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var ids = obj.id.split(':');
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if (ids.length != 3) { obj.ws.close(); obj.id = null; return null; } // Invalid ID, drop this.
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if (parent.crypto.createHmac('SHA384', parent.relayRandom).update(ids[0] + ':' + ids[1]).digest('hex') != ids[2]) { obj.ws.close(); obj.id = null; return null; } // Invalid HMAC, drop this.
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if ((Date.now() - parseInt(ids[1])) > 120000) { obj.ws.close(); obj.id = null; return null; } // Expired time, drop this.
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obj.id = ids[0];
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}
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*/
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// Check the peer connection status
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{
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var relayinfo = parent.wsrelays[obj.id];
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if (relayinfo) {
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if (relayinfo.state == 1) {
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// Check that at least one connection is authenticated
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if ((obj.authenticated != true) && (relayinfo.peer1.authenticated != true)) {
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obj.id = null;
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obj.ws.close();
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obj.parent.parent.debug(1, 'Relay without-auth: ' + obj.id + ' (' + obj.remoteaddr + ')');
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return null;
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}
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// Connect to peer
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obj.peer = relayinfo.peer1;
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obj.peer.peer = obj;
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relayinfo.peer2 = obj;
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relayinfo.state = 2;
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obj.ws.send('c'); // Send connect to both peers
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relayinfo.peer1.ws.send('c');
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relayinfo.peer1.ws.resume(); // Release the traffic
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relayinfo.peer1.ws.peer = relayinfo.peer2.ws;
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relayinfo.peer2.ws.peer = relayinfo.peer1.ws;
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obj.parent.parent.debug(1, 'Relay connected: ' + obj.id + ' (' + obj.remoteaddr + ' --> ' + obj.peer.remoteaddr + ')');
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} else {
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// Connected already, drop (TODO: maybe we should re-connect?)
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obj.id = null;
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obj.ws.close();
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obj.parent.parent.debug(1, 'Relay duplicate: ' + obj.id + ' (' + obj.remoteaddr + ')');
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return null;
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}
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} else {
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// Wait for other relay connection
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ws.pause(); // Hold traffic until the other connection
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parent.wsrelays[obj.id] = { peer1: obj, state: 1 };
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obj.parent.parent.debug(1, 'Relay holding: ' + obj.id + ' (' + obj.remoteaddr + ') ' + (obj.authenticated?'Authenticated':'') );
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// Check if a peer server has this connection
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if (parent.parent.multiServer != null) {
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var rsession = obj.parent.wsPeerRelays[obj.id];
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if ((rsession != null) && (rsession.serverId > obj.parent.parent.serverId)) {
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// We must initiate the connection to the peer
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parent.parent.multiServer.createPeerRelay(ws, req, rsession.serverId, req.session.userid);
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delete parent.wsrelays[obj.id];
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} else {
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// Send message to other peers that we have this connection
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parent.parent.multiServer.DispatchMessage(JSON.stringify({ action: 'relay', id: obj.id }));
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}
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}
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}
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}
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}
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ws.flushSink = function () { try { ws.resume(); } catch (e) { } };
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// When data is received from the mesh relay web socket
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ws.on('message', function (data) {
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//console.log(typeof data, data.length);
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if (this.peer != null) {
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//if (typeof data == 'string') { console.log('Relay: ' + data); } else { console.log('Relay:' + data.length + ' byte(s)'); }
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try { this.pause(); this.peer.send(data, ws.flushSink); } catch (e) { }
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}
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});
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// If error, do nothing
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ws.on('error', function (err) { /*console.log('Relay Error: ' + err);*/ });
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// If the mesh relay web socket is closed
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ws.on('close', function (req) {
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if (obj.id != null) {
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var relayinfo = parent.wsrelays[obj.id];
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if (relayinfo != null) {
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if (relayinfo.state == 2) {
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// Disconnect the peer
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var peer = (relayinfo.peer1 == obj) ? relayinfo.peer2 : relayinfo.peer1;
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obj.parent.parent.debug(1, 'Relay disconnect: ' + obj.id + ' (' + obj.remoteaddr + ' --> ' + peer.remoteaddr + ')');
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peer.id = null;
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try { peer.ws.close(); } catch (e) { } // Soft disconnect
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try { peer.ws._socket._parent.end(); } catch (e) { } // Hard disconnect
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} else {
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obj.parent.parent.debug(1, 'Relay disconnect: ' + obj.id + ' (' + obj.remoteaddr + ')');
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}
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delete parent.wsrelays[obj.id];
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}
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obj.peer = null;
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obj.id = null;
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}
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});
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return obj;
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}
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