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