mirror of
https://github.com/Ylianst/MeshCentral.git
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313 lines
17 KiB
JavaScript
313 lines
17 KiB
JavaScript
/**
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* @description MeshCentral device file download relay module
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* @author Ylian Saint-Hilaire
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* @copyright Intel Corporation 2018-2020
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* @license Apache-2.0
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* @version v0.0.1
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*/
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/*jslint node: true */
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/*jshint node: true */
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/*jshint strict:false */
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/*jshint -W097 */
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/*jshint esversion: 6 */
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"use strict";
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module.exports.CreateMeshDeviceFile = function (parent, ws, res, req, domain, user, meshid, nodeid) {
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var obj = {};
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obj.ws = ws;
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obj.res = res;
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obj.user = user;
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obj.ruserid = null;
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obj.req = req; // Used in multi-server.js
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obj.id = req.query.id;
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obj.file = req.query.f;
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// Check relay authentication
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if ((user == null) && (obj.req.query != null) && (obj.req.query.rauth != null)) {
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const rcookie = parent.parent.decodeCookie(obj.req.query.rauth, parent.parent.loginCookieEncryptionKey, 240); // Cookie with 4 hour timeout
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if (rcookie.ruserid != null) { obj.ruserid = rcookie.ruserid; }
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}
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// Relay session count (we may remove this in the future)
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obj.relaySessionCounted = true;
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parent.relaySessionCount++;
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// Mesh Rights
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const MESHRIGHT_EDITMESH = 1;
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const MESHRIGHT_MANAGEUSERS = 2;
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const MESHRIGHT_MANAGECOMPUTERS = 4;
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const MESHRIGHT_REMOTECONTROL = 8;
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const MESHRIGHT_AGENTCONSOLE = 16;
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const MESHRIGHT_SERVERFILES = 32;
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const MESHRIGHT_WAKEDEVICE = 64;
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const MESHRIGHT_SETNOTES = 128;
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const MESHRIGHT_REMOTEVIEW = 256;
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// Site rights
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const SITERIGHT_SERVERBACKUP = 1;
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const SITERIGHT_MANAGEUSERS = 2;
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const SITERIGHT_SERVERRESTORE = 4;
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const SITERIGHT_FILEACCESS = 8;
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const SITERIGHT_SERVERUPDATE = 16;
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const SITERIGHT_LOCKED = 32;
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// Clean a IPv6 address that encodes a IPv4 address
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function cleanRemoteAddr(addr) { if (addr.startsWith('::ffff:')) { return addr.substring(7); } else { return addr; } }
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// Disconnect
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obj.close = function (arg) {
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if (obj.ws != null) {
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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
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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
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} else if (obj.res != null) {
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try { res.sendStatus(404); } catch (ex) { }
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}
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// Aggressive cleanup
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delete obj.ws;
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delete obj.res;
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delete obj.peer;
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};
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// If there is no authentication, drop this connection
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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; }
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obj.sendAgentMessage = function (command, user, domainid) {
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var rights, mesh;
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if (command.nodeid == 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 = 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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rights = parent.GetNodeRights(user, agent.dbMeshKey, agent.dbNodeKey);
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mesh = parent.meshes[agent.dbMeshKey];
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if ((rights != null) && (mesh != null) || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { // 8 is device remote control
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command.rights = rights; // Add user rights flags to the message
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if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
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if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
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command.username = user.name; // Add user name
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command.realname = user.realname; // Add real name
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if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
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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 = parent.parent.GetRoutingServerIdNotSelf(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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rights = parent.GetNodeRights(user, routing.meshid, command.nodeid);
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mesh = parent.meshes[routing.meshid];
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if (rights != null || ((rights & MESHRIGHT_REMOTECONTROL) != 0)) { // 8 is device remote control
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command.rights = rights; // Add user rights flags to the message
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if (typeof command.consent == 'number') { command.consent = command.consent | mesh.consent; } else { command.consent = mesh.consent; } // Add user consent
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if (typeof domain.userconsentflags == 'number') { command.consent |= domain.userconsentflags; } // Add server required consent flags
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command.username = user.name; // Add user name
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command.realname = user.realname; // Add real name
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if (typeof domain.desktopprivacybartext == 'string') { command.privacybartext = domain.desktopprivacybartext; } // Privacy bar text
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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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function performRelay() {
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if (obj.id == null) { try { obj.close(); } catch (e) { } return; } // Attempt to connect without id, drop this.
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if (obj.ws != null) { obj.ws._socket.setKeepAlive(true, 240000); } // Set TCP keep alive
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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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if (ws) { ws.close(); }
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parent.parent.debug('relay', 'FileRelay without-auth: ' + obj.id + ' (' + obj.req.clientIp + ')');
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delete obj.id;
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delete obj.ws;
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delete obj.peer;
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return;
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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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// Remove the timeout
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if (relayinfo.timeout) { clearTimeout(relayinfo.timeout); delete relayinfo.timeout; }
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var agentws = null, file = null;
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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; }
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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; }
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agentws._socket.resume(); // Release the traffic
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try { agentws.send('c'); } catch (ex) { } // Send connect to agent
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try { agentws.send(JSON.stringify({ type: 'options', file: file })); } catch (ex) { } // Send options to agent
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try { agentws.send('10'); } catch (ex) { } // Send file transfer protocol to agent
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parent.parent.debug('relay', 'FileRelay connected: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + obj.peer.req.clientIp + ')');
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// Log the connection
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if (obj.user != null) {
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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 };
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parent.parent.DispatchEvent(['*', obj.user._id], obj, event);
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}
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} else {
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// Connected already, drop this connection.
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if (obj.ws) { obj.ws.close(); }
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parent.parent.debug('relay', 'FileRelay duplicate: ' + obj.id + ' (' + obj.req.clientIp + ')');
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delete obj.id;
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delete obj.ws;
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delete obj.peer;
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return;
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}
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} else {
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// Wait for other relay connection
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parent.wsrelays[obj.id] = { peer1: obj, state: 1, timeout: setTimeout(closeBothSides, 30000) };
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parent.parent.debug('relay', 'FileRelay holding: ' + obj.id + ' (' + obj.req.clientIp + ') ' + (obj.authenticated ? 'Authenticated' : ''));
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if (obj.ws != null) {
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// Websocket connection
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obj.ws._socket.pause();
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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 = parent.wsPeerRelays[obj.id];
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if ((rsession != null) && (rsession.serverId > 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, obj.req.session.userid);
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delete parent.wsrelays[obj.id];
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return;
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} else {
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// Unexpected connection, drop it
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if (obj.ws) { obj.ws.close(); }
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parent.parent.debug('relay', 'FileRelay unexpected connection: ' + obj.id + ' (' + obj.req.clientIp + ')');
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delete obj.id;
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delete obj.ws;
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delete obj.peer;
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return;
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}
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}
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} else {
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// HTTP connection, Send message to other peers that we have this connection
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if (parent.parent.multiServer != null) { parent.parent.multiServer.DispatchMessage(JSON.stringify({ action: 'relay', id: obj.id })); }
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return;
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}
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}
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}
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// Websocket handling
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if (obj.ws != null) {
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// When data is received from the mesh relay web socket
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obj.ws.on('message', function (data) {
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if (this.res == null) { return; } // File download websocket does not have an HTTP peer, should not happen.
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if (typeof data == 'string') {
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var cmd = null;
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try { cmd = JSON.parse(data); } catch (ex) { }
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if ((cmd == null) || (typeof cmd.op == 'string')) {
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if (cmd.op == 'ok') {
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setContentDispositionHeader(this.res, 'application/octet-stream', this.file, cmd.size, 'file.bin');
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} else {
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try { this.res.sendStatus(401); } catch (ex) { }
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}
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}
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} else {
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var unpause = function unpauseFunc(err) { try { unpauseFunc.s.resume(); } catch (ex) { } }
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unpause.s = this._socket;
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this._socket.pause();
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try { this.res.write(data, unpause); } catch (ex) { }
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}
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});
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// If error, close both sides of the relay.
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obj.ws.on('error', function (err) {
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parent.relaySessionErrorCount++;
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//console.log('FileRelay error from ' + obj.req.clientIp + ', ' + err.toString().split('\r')[0] + '.');
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closeBothSides();
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});
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// If the relay web socket is closed, close both sides.
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obj.ws.on('close', function (req) { closeBothSides(); });
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}
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}
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// Close both our side and the peer side.
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function closeBothSides() {
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if (obj.relaySessionCounted) { parent.relaySessionCount--; delete obj.relaySessionCounted; }
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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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var peer = (relayinfo.peer1 == obj) ? relayinfo.peer2 : relayinfo.peer1;
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// Disconnect the peer
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try { if (peer.relaySessionCounted) { parent.relaySessionCount--; delete peer.relaySessionCounted; } } catch (ex) { console.log(ex); }
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parent.parent.debug('relay', 'FileRelay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ' --> ' + peer.req.clientIp + ')');
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if (peer.ws) { try { peer.ws.close(); } catch (e) { } try { peer.ws._socket._parent.end(); } catch (e) { } }
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if (peer.res) { try { peer.res.end(); } catch (ex) { } }
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// Aggressive peer cleanup
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delete peer.id;
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delete peer.ws;
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delete peer.res;
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delete peer.peer;
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} else {
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parent.parent.debug('relay', 'FileRelay disconnect: ' + obj.id + ' (' + obj.req.clientIp + ')');
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}
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if (obj.ws) { try { obj.ws.close(); } catch (ex) { } }
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if (obj.res) { try { obj.res.end(); } catch (ex) { } }
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delete parent.wsrelays[obj.id];
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}
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}
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// Aggressive cleanup
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delete obj.id;
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delete obj.ws;
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delete obj.res;
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delete obj.peer;
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}
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// Mark this relay session as authenticated if this is the user end.
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obj.authenticated = (user != null);
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if (obj.authenticated) {
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// Send connection request to agent
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const rcookie = parent.parent.encodeCookie({ ruserid: user._id }, parent.parent.loginCookieEncryptionKey);
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const command = { nodeid: nodeid, action: 'msg', type: 'tunnel', userid: user._id, value: '*/devicefile.ashx?id=' + obj.id + '&rauth=' + rcookie, soptions: {} };
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parent.parent.debug('relay', 'FileRelay: Sending agent tunnel command: ' + JSON.stringify(command));
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if (obj.sendAgentMessage(command, user, domain.id) == false) { delete obj.id; parent.parent.debug('relay', 'FileRelay: Unable to contact this agent (' + obj.req.clientIp + ')'); }
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}
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// Set the content disposition header for a HTTP response.
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// Because the filename can't have any special characters in it, we need to be extra careful.
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function setContentDispositionHeader(res, type, name, size, altname) {
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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('').split('\'').join(''); } else { name = altname; }
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try {
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var x = { 'Cache-Control': 'no-store', 'Content-Type': type, 'Content-Disposition': 'attachment; filename="' + name + '"' };
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if (typeof size == 'number') { x['Content-Length'] = size; }
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res.set(x);
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} catch (ex) {
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var x = { 'Cache-Control': 'no-store', 'Content-Type': type, 'Content-Disposition': 'attachment; filename="' + altname + '"' };
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if (typeof size == 'number') { x['Content-Length'] = size; }
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res.set(x);
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}
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}
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// If this is not an authenticated session, or the session does not have routing instructions, just go ahead an connect to existing session.
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performRelay();
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return obj;
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};
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