123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312 |
- /**
- * @description MeshCentral device file download relay module
- * @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";
- module.exports.CreateMeshDeviceFile = function (parent, ws, res, req, domain, user, meshid, nodeid) {
- var obj = {};
- obj.ws = ws;
- obj.res = res;
- obj.user = user;
- obj.ruserid = null;
- obj.req = req; // Used in multi-server.js
- obj.id = req.query.id;
- obj.file = req.query.f;
- // Check relay authentication
- if ((user == null) && (obj.req.query != null) && (obj.req.query.rauth != null)) {
- const rcookie = parent.parent.decodeCookie(obj.req.query.rauth, parent.parent.loginCookieEncryptionKey, 240); // Cookie with 4 hour timeout
- if (rcookie.ruserid != null) { obj.ruserid = rcookie.ruserid; }
- }
- // Relay session count (we may remove this in the future)
- obj.relaySessionCounted = true;
- 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;
- // Clean a IPv6 address that encodes a IPv4 address
- function cleanRemoteAddr(addr) { if (addr.startsWith('::ffff:')) { return addr.substring(7); } else { return addr; } }
- // Disconnect
- obj.close = function (arg) {
- if (obj.ws != null) {
- if ((arg == 1) || (arg == null)) { try { obj.ws.close(); parent.parent.debug('relay', 'FileRelay: Soft disconnect (' + obj.req.clientIp + ')'); } catch (ex) { console.log(e); } } // Soft close, close the websocket
- if (arg == 2) { try { obj.ws._socket._parent.end(); parent.parent.debug('relay', 'FileRelay: Hard disconnect (' + obj.req.clientIp + ')'); } catch (ex) { console.log(e); } } // Hard close, close the TCP socket
- } else if (obj.res != null) {
- try { res.sendStatus(404); } catch (ex) { }
- }
- // Aggressive cleanup
- delete obj.ws;
- delete obj.res;
- delete obj.peer;
- };
- // If there is no authentication, drop this connection
- if ((obj.id == null) || ((obj.user == null) && (obj.ruserid == null))) { try { obj.close(); parent.parent.debug('relay', 'FileRelay: Connection with no authentication (' + obj.req.clientIp + ')'); } catch (e) { console.log(e); } return; }
- obj.sendAgentMessage = function (command, user, domainid) {
- var rights, mesh;
- if (command.nodeid == 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 = parent.wsagents[command.nodeid];
- if (agent != null) {
- // Check if we have permission to send a message to that node
- rights = parent.GetNodeRights(user, agent.dbMeshKey, agent.dbNodeKey);
- mesh = parent.meshes[agent.dbMeshKey];
- if ((rights != null) && (mesh != null) || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { // 8 is device remote control
- command.rights = rights; // Add user rights flags to the message
- if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
- if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
- command.username = user.name; // Add user name
- command.realname = user.realname; // Add real name
- if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
- 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 = parent.parent.GetRoutingServerIdNotSelf(command.nodeid, 1); // 1 = MeshAgent routing type
- if (routing != null) {
- // Check if we have permission to send a message to that node
- rights = parent.GetNodeRights(user, routing.meshid, command.nodeid);
- mesh = parent.meshes[routing.meshid];
- if (rights != null || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { // 8 is device remote control
- command.rights = rights; // Add user rights flags to the message
- if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
- if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
- command.username = user.name; // Add user name
- command.realname = user.realname; // Add real name
- if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
- parent.parent.multiServer.DispatchMessageSingleServer(command, routing.serverid);
- return true;
- }
- }
- }
- }
- return false;
- };
- function performRelay() {
- if (obj.id == null) { try { obj.close(); } catch (e) { } return; } // Attempt to connect without id, drop this.
- if (obj.ws != null) { obj.ws._socket.setKeepAlive(true, 240000); } // Set TCP keep alive
- // 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)) {
- if (ws) { ws.close(); }
- parent.parent.debug('relay', 'FileRelay without-auth: ' + obj.id + ' (' + obj.req.clientIp + ')');
- delete obj.id;
- delete obj.ws;
- delete obj.peer;
- return;
- }
- // Connect to peer
- obj.peer = relayinfo.peer1;
- obj.peer.peer = obj;
- relayinfo.peer2 = obj;
- relayinfo.state = 2;
- // Remove the timeout
- if (relayinfo.timeout) { clearTimeout(relayinfo.timeout); delete relayinfo.timeout; }
- var agentws = null, file = null;
- if (relayinfo.peer1.ws) { relayinfo.peer1.ws.res = relayinfo.peer2.res; relayinfo.peer1.ws.res = relayinfo.peer2.res; relayinfo.peer1.ws.file = relayinfo.peer2.file; agentws = relayinfo.peer1.ws; file = relayinfo.peer2.file; }
- if (relayinfo.peer2.ws) { relayinfo.peer2.ws.res = relayinfo.peer1.res; relayinfo.peer2.ws.res = relayinfo.peer1.res; relayinfo.peer2.ws.file = relayinfo.peer1.file; agentws = relayinfo.peer2.ws; file = relayinfo.peer1.file; }
- agentws._socket.resume(); // Release the traffic
- try { agentws.send('c'); } catch (ex) { } // Send connect to agent
- try { agentws.send(JSON.stringify({ type: 'options', file: file })); } catch (ex) { } // Send options to agent
- try { agentws.send('10'); } catch (ex) { } // Send file transfer protocol to agent
- parent.parent.debug('relay', 'FileRelay connected: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + obj.peer.req.clientIp + ')');
- // Log the connection
- if (obj.user != null) {
- var event = { etype: 'relay', action: 'relaylog', domain: domain.id, userid: obj.user._id, username: obj.user.name, msg: "Started file transfer session" + ' \"' + obj.id + '\" from ' + obj.peer.req.clientIp + ' to ' + req.clientIp, protocol: req.query.p, nodeid: req.query.nodeid };
- parent.parent.DispatchEvent(['*', obj.user._id], obj, event);
- }
- } else {
- // Connected already, drop this connection.
- if (obj.ws) { obj.ws.close(); }
- parent.parent.debug('relay', 'FileRelay duplicate: ' + obj.id + ' (' + obj.req.clientIp + ')');
- delete obj.id;
- delete obj.ws;
- delete obj.peer;
- return;
- }
- } else {
- // Wait for other relay connection
- parent.wsrelays[obj.id] = { peer1: obj, state: 1, timeout: setTimeout(closeBothSides, 30000) };
- parent.parent.debug('relay', 'FileRelay holding: ' + obj.id + ' (' + obj.req.clientIp + ') ' + (obj.authenticated ? 'Authenticated' : ''));
- if (obj.ws != null) {
- // Websocket connection
- obj.ws._socket.pause();
- // Check if a peer server has this connection
- if (parent.parent.multiServer != null) {
- var rsession = parent.wsPeerRelays[obj.id];
- if ((rsession != null) && (rsession.serverId > parent.parent.serverId)) {
- // We must initiate the connection to the peer
- parent.parent.multiServer.createPeerRelay(ws, req, rsession.serverId, obj.req.session.userid);
- delete parent.wsrelays[obj.id];
- return;
- } else {
- // Unexpected connection, drop it
- if (obj.ws) { obj.ws.close(); }
- parent.parent.debug('relay', 'FileRelay unexpected connection: ' + obj.id + ' (' + obj.req.clientIp + ')');
- delete obj.id;
- delete obj.ws;
- delete obj.peer;
- return;
- }
- }
- } else {
- // HTTP connection, Send message to other peers that we have this connection
- if (parent.parent.multiServer != null) { parent.parent.multiServer.DispatchMessage(JSON.stringify({ action: 'relay', id: obj.id })); }
- return;
- }
- }
- }
- // Websocket handling
- if (obj.ws != null) {
- // When data is received from the mesh relay web socket
- obj.ws.on('message', function (data) {
- if (this.res == null) { return; } // File download websocket does not have an HTTP peer, should not happen.
- if (typeof data == 'string') {
- var cmd = null;
- try { cmd = JSON.parse(data); } catch (ex) { }
- if ((cmd == null) || (typeof cmd.op == 'string')) {
- if (cmd.op == 'ok') {
- setContentDispositionHeader(this.res, 'application/octet-stream', this.file, cmd.size, 'file.bin');
- } else {
- try { this.res.sendStatus(401); } catch (ex) { }
- }
- }
- } else {
- var unpause = function unpauseFunc(err) { try { unpauseFunc.s.resume(); } catch (ex) { } }
- unpause.s = this._socket;
- this._socket.pause();
- try { this.res.write(data, unpause); } catch (ex) { }
- }
- });
- // If error, close both sides of the relay.
- obj.ws.on('error', function (err) {
- parent.relaySessionErrorCount++;
- //console.log('FileRelay error from ' + obj.req.clientIp + ', ' + err.toString().split('\r')[0] + '.');
- closeBothSides();
- });
- // If the relay web socket is closed, close both sides.
- obj.ws.on('close', function (req) { closeBothSides(); });
- }
- }
- // Close both our side and the peer side.
- function closeBothSides() {
- if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; }
- if (obj.id != null) {
- var relayinfo = parent.wsrelays[obj.id];
- if (relayinfo != null) {
- if (relayinfo.state == 2) {
- var peer = (relayinfo.peer1 == obj) ? relayinfo.peer2 : relayinfo.peer1;
- // Disconnect the peer
- try { if (peer.relaySessionCounted) { parent.relaySessionCount--; delete peer.relaySessionCounted; } } catch (ex) { console.log(ex); }
- parent.parent.debug('relay', 'FileRelay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + peer.req.clientIp + ')');
- if (peer.ws) { try { peer.ws.close(); } catch (e) { } try { peer.ws._socket._parent.end(); } catch (e) { } }
- if (peer.res) { try { peer.res.end(); } catch (ex) { } }
- // Aggressive peer cleanup
- delete peer.id;
- delete peer.ws;
- delete peer.res;
- delete peer.peer;
- } else {
- parent.parent.debug('relay', 'FileRelay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ')');
- }
- if (obj.ws) { try { obj.ws.close(); } catch (ex) { } }
- if (obj.res) { try { obj.res.end(); } catch (ex) { } }
- delete parent.wsrelays[obj.id];
- }
- }
- // Aggressive cleanup
- delete obj.id;
- delete obj.ws;
- delete obj.res;
- delete obj.peer;
- }
- // Mark this relay session as authenticated if this is the user end.
- obj.authenticated = (user != null);
- if (obj.authenticated) {
- // Send connection request to agent
- const rcookie = parent.parent.encodeCookie({ ruserid: user._id }, parent.parent.loginCookieEncryptionKey);
- const command = { nodeid: nodeid, action: 'msg', type: 'tunnel', userid: user._id, value: '*/devicefile.ashx?id=' + obj.id + '&rauth=' + rcookie, soptions: {} };
- parent.parent.debug('relay', 'FileRelay: Sending agent tunnel command: ' + JSON.stringify(command));
- if (obj.sendAgentMessage(command, user, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'FileRelay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
- }
- // Set the content disposition header for a HTTP response.
- // Because the filename can't have any special characters in it, we need to be extra careful.
- function setContentDispositionHeader(res, type, name, size, altname) {
- if (name != null) { name = require('path').basename(name).split('\\').join('').split('/').join('').split(':').join('').split('*').join('').split('?').join('').split('"').join('').split('<').join('').split('>').join('').split('|').join('').split('\'').join(''); } else { name = altname; }
- try {
- var x = { 'Cache-Control': 'no-store', 'Content-Type': type, 'Content-Disposition': 'attachment; filename="' + encodeURIComponent(name) + '"' };
- if (typeof size == 'number') { x['Content-Length'] = size; }
- res.set(x);
- } catch (ex) {
- var x = { 'Cache-Control': 'no-store', 'Content-Type': type, 'Content-Disposition': 'attachment; filename="' + altname + '"' };
- if (typeof size == 'number') { x['Content-Length'] = size; }
- try { res.set(x); } catch (ex) { }
- }
- }
- // 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;
- };
|