MeshCentral/meshrelay.js
2018-08-30 12:05:23 -07:00

225 lines
12 KiB
JavaScript

/**
* @description MeshCentral connection relay module
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018
* @license Apache-2.0
* @version v0.0.1
*/
/*jslint node: true */
/*jshint node: true */
/*jshint strict:false */
/*jshint -W097 */
/*jshint esversion: 6 */
"use strict";
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) {
var rights;
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
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
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 if 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 (this.peer != null) {
//if (typeof data == 'string') { console.log('Relay: ' + data); } else { console.log('Relay:' + data.length + ' byte(s)'); }
try { this.pause(); this.peer.send(data, ws.flushSink); } catch (e) { }
}
});
// If error, do nothing
ws.on('error', function (err) { /*console.log('Relay Error: ' + 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;
};