MeshCentral/meshrelay.js
2019-02-18 17:14:00 -08:00

278 lines
15 KiB
JavaScript

/**
* @description MeshCentral connection relay module
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018-2019
* @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, user, cookie) {
var obj = {};
obj.ws = ws;
obj.req = req;
obj.peer = null;
obj.user = user;
obj.cookie = cookie;
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); }
obj.parent.relaySessionCount++;
// Mesh Rights
const MESHRIGHT_EDITMESH = 1;
const MESHRIGHT_MANAGEUSERS = 2;
const MESHRIGHT_MANAGECOMPUTERS = 4;
const MESHRIGHT_REMOTECONTROL = 8;
const MESHRIGHT_AGENTCONSOLE = 16;
const MESHRIGHT_SERVERFILES = 32;
const MESHRIGHT_WAKEDEVICE = 64;
const MESHRIGHT_SETNOTES = 128;
const MESHRIGHT_REMOTEVIEW = 256;
// Site rights
const SITERIGHT_SERVERBACKUP = 1;
const SITERIGHT_MANAGEUSERS = 2;
const SITERIGHT_SERVERRESTORE = 4;
const SITERIGHT_FILEACCESS = 8;
const SITERIGHT_SERVERUPDATE = 16;
const SITERIGHT_LOCKED = 32;
// 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;
};
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
// If this is a MeshMessenger session, the ID is the two userid's and authentication must match one of them.
if (obj.id.startsWith('meshmessenger/')) {
if ((obj.id.startsWith('meshmessenger/user/') == true) && (obj.user == null)) { try { obj.close(); } catch (e) { } return null; } // If user-to-user, both sides need to be authenticated.
var x = obj.id.split('/'), user1 = x[1] + '/' + x[2] + '/' + x[3], user2 = x[4] + '/' + x[5] + '/' + x[6];
if ((x[1] != 'user') && (x[4] != 'user')) { try { obj.close(); } catch (e) { } return null; } // MeshMessenger session must have at least one authenticated user
if ((x[1] == 'user') && (x[4] == 'user')) {
// If this is a user-to-user session, you must be authenticated to join.
if ((obj.user._id != user1) && (obj.user._id != user2)) { try { obj.close(); } catch (e) { } return null; }
} else {
// If only one side of the session is a user
// !!!!! TODO: Need to make sure that one of the two sides is the correct user. !!!!!
}
}
// 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._socket.resume(); // Release the traffic
relayinfo.peer2.ws._socket.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._socket.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._socket.resume(); } catch (ex) { console.log(ex); } };
// 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._socket.pause();
this.peer.send(data, ws.flushSink);
} catch (ex) { console.log(ex); }
}
});
// If error, close both sides of the relay.
ws.on('error', function (err) {
obj.parent.relaySessionErrorCount++;
console.log('Relay error from ' + obj.remoteaddr + ', ' + err.toString().split('\r')[0] + '.');
closeBothSides();
});
// If the relay web socket is closed, close both sides.
ws.on('close', function (req) {
obj.parent.relaySessionCount--;
closeBothSides();
});
// Close both our side and the peer side.
function closeBothSides() {
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;
}
}
// Mark this relay session as authenticated if this is the user end.
obj.authenticated = (obj.user != null);
if (obj.authenticated) {
// Kick off the routing, if we have agent routing instructions, process them here.
// Routing instructions can only be given by a authenticated user
if ((obj.cookie != null) && (obj.cookie.nodeid != null) && (obj.cookie.tcpport != null) && (obj.cookie.domainid != null)) {
// We have routing instructions in the cookie, but first, check user access for this node.
obj.parent.db.Get(obj.cookie.nodeid, function (err, docs) {
if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
var node = docs[0];
// Check if this user has permission to manage this computer
var meshlinks = obj.user.links[node.meshid];
if ((!meshlinks) || (!meshlinks.rights) || ((meshlinks.rights & MESHRIGHT_REMOTECONTROL) == 0)) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; }
// Send connection request to agent
if (obj.id == undefined) { obj.id = ('' + Math.random()).substring(2); } // If there is no connection id, generate one.
var command = { nodeid: obj.cookie.nodeid, action: 'msg', type: 'tunnel', value: '*/meshrelay.ashx?id=' + obj.id, tcpport: obj.cookie.tcpport, tcpaddr: obj.cookie.tcpaddr };
obj.parent.parent.debug(1, 'Relay: Sending agent tunnel command: ' + JSON.stringify(command));
if (obj.sendAgentMessage(command, obj.user._id, obj.cookie.domainid) == false) { obj.id = null; obj.parent.parent.debug(1, 'Relay: Unable to contact this agent (' + obj.remoteaddr + ')'); }
performRelay();
});
return obj;
} else if ((req.query.nodeid != null) && (req.query.tcpport != null)) {
// We have routing instructions in the URL arguments, but first, check user access for this node.
obj.parent.db.Get(req.query.nodeid, function (err, docs) {
if (docs.length == 0) { console.log('ERR: Node not found'); try { obj.close(); } catch (e) { } return; } // Disconnect websocket
var node = docs[0];
// Check if this user has permission to manage this computer
var meshlinks = obj.user.links[node.meshid];
if ((!meshlinks) || (!meshlinks.rights) || ((meshlinks.rights & MESHRIGHT_REMOTECONTROL) == 0)) { console.log('ERR: Access denied (2)'); try { obj.close(); } catch (e) { } return; }
// Send connection request to agent
if (obj.id == null) { 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) };
obj.parent.parent.debug(1, 'Relay: Sending agent tunnel command: ' + JSON.stringify(command));
if (obj.sendAgentMessage(command, obj.user._id, obj.domain.id) == false) { obj.id = null; obj.parent.parent.debug(1, 'Relay: Unable to contact this agent (' + obj.remoteaddr + ')'); }
performRelay();
});
return obj;
}
}
// If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session.
performRelay();
return obj;
};