MeshCentral/meshdevicefile.js
2020-11-14 22:14:02 -08:00

313 lines
17 KiB
JavaScript

/**
* @description MeshCentral device file download relay module
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018-2020
* @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('').split('\'').join(''); } else { name = altname; }
try {
var x = { 'Cache-Control': 'no-store', 'Content-Type': type, 'Content-Disposition': 'attachment; filename="' + 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; }
res.set(x);
}
}
// 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;
};