mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-12-26 23:25:53 -05:00
355 lines
14 KiB
JavaScript
355 lines
14 KiB
JavaScript
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var MemoryStream = require('MemoryStream');
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var lme_id = 0;
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var APF_DISCONNECT = 1;
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var APF_SERVICE_REQUEST = 5;
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var APF_SERVICE_ACCEPT = 6;
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var APF_USERAUTH_REQUEST = 50;
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var APF_USERAUTH_FAILURE = 51;
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var APF_USERAUTH_SUCCESS = 52;
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var APF_GLOBAL_REQUEST = 80;
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var APF_REQUEST_SUCCESS = 81;
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var APF_REQUEST_FAILURE = 82;
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var APF_CHANNEL_OPEN = 90;
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var APF_CHANNEL_OPEN_CONFIRMATION = 91;
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var APF_CHANNEL_OPEN_FAILURE = 92;
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var APF_CHANNEL_WINDOW_ADJUST = 93;
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var APF_CHANNEL_DATA = 94;
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var APF_CHANNEL_CLOSE = 97;
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var APF_PROTOCOLVERSION = 192;
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function lme_object()
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{
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this.ourId = ++lme_id;
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this.amtId = -1;
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this.LME_CHANNEL_STATUS = 'LME_CS_FREE';
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this.txWindow = 0;
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this.rxWindow = 0;
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this.localPort = 0;
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this.errorCount = 0;
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}
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function stream_bufferedWrite()
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{
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var emitterUtils = require('events').inherits(this);
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this.buffer = [];
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this._readCheckImmediate = undefined;
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// Writable Events
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emitterUtils.createEvent('close');
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emitterUtils.createEvent('drain');
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emitterUtils.createEvent('error');
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emitterUtils.createEvent('finish');
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emitterUtils.createEvent('pipe');
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emitterUtils.createEvent('unpipe');
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// Readable Events
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emitterUtils.createEvent('readable');
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this.isEmpty = function ()
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{
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return (this.buffer.length == 0);
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};
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this.isWaiting = function ()
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{
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return (this._readCheckImmediate == undefined);
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};
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this.write = function (chunk)
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{
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for (var args in arguments)
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{
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if (typeof (arguments[args]) == 'function') { this.once('drain', arguments[args]); break; }
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}
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var tmp = Buffer.alloc(chunk.length);
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chunk.copy(tmp);
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this.buffer.push({ offset: 0, data: tmp });
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this.emit('readable');
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return (this.buffer.length == 0 ? true : false);
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};
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this.read = function ()
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{
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var size = arguments.length == 0 ? undefined : arguments[0];
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var bytesRead = 0;
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var list = [];
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while((size == undefined || bytesRead < size) && this.buffer.length > 0)
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{
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var len = this.buffer[0].data.length - this.buffer[0].offset;
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var offset = this.buffer[0].offset;
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if(len > (size - bytesRead))
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{
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// Only reading a subset
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list.push(this.buffer[0].data.slice(offset, offset + size - bytesRead));
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this.buffer[0].offset += (size - bytesRead);
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bytesRead += (size - bytesRead);
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}
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else
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{
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// Reading the entire thing
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list.push(this.buffer[0].data.slice(offset));
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bytesRead += len;
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this.buffer.shift();
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}
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}
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this._readCheckImmediate = setImmediate(function (buffered)
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{
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buffered._readCheckImmediate = undefined;
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if(buffered.buffer.length == 0)
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{
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// drained
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buffered.emit('drain');
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}
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else
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{
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// not drained
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buffered.emit('readable');
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}
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}, this);
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return (Buffer.concat(list));
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};
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}
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function lme_heci()
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{
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var emitterUtils = require('events').inherits(this);
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emitterUtils.createEvent('error');
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emitterUtils.createEvent('connect');
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var heci = require('heci');
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this.INITIAL_RXWINDOW_SIZE = 4096;
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this._LME = heci.create();
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this._LME.LMS = this;
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this._LME.on('error', function (e) { this.Parent.emit('error', e); });
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this._LME.on('connect', function ()
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{
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this.LMS.emit('connect');
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this.on('data', function (chunk)
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{
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// this = HECI
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var cmd = chunk.readUInt8(0);
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switch(cmd)
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{
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default:
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//console.log('Received ' + chunk.length + ' bytes of data for LMS');
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//console.log('Command = ' + cmd);
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break;
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case APF_SERVICE_REQUEST:
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var nameLen = chunk.readUInt32BE(1);
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var name = chunk.slice(5, nameLen + 5);
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//console.log("Service Request for: " + name);
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if (name == 'pfwd@amt.intel.com' || name == 'auth@amt.intel.com')
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{
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var outBuffer = Buffer.alloc(5 + nameLen);
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outBuffer.writeUInt8(6, 0);
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outBuffer.writeUInt32BE(nameLen, 1);
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outBuffer.write(name.toString(), 5);
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this.write(outBuffer);
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//console.log('Answering APF_SERVICE_REQUEST');
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}
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else
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{
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//console.log('UNKNOWN APF_SERVICE_REQUEST');
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}
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break;
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case APF_GLOBAL_REQUEST:
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var nameLen = chunk.readUInt32BE(1);
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var name = chunk.slice(5, nameLen + 5).toString();
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switch(name)
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{
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case 'tcpip-forward':
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var len = chunk.readUInt32BE(nameLen + 6);
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var port = chunk.readUInt32BE(nameLen + 10 + len);
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//console.log("[" + chunk.length + "/" + len + "] APF_GLOBAL_REQUEST for: " + name + " on port " + port);
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if (this[name] == undefined)
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{
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this[name] = {};
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}
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this[name][port] = require('net').createServer();
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this[name][port].HECI = this;
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this[name][port].listen({ port: port });
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this[name][port].on('connection', function (socket)
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{
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//console.log('New [' + socket.remoteFamily + '] TCP Connection on: ' + socket.remoteAddress + ' :' + socket.localPort);
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this.HECI.LMS.bindDuplexStream(socket, socket.remoteFamily, socket.localPort);
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});
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var outBuffer = Buffer.alloc(5);
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outBuffer.writeUInt8(81, 0);
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outBuffer.writeUInt32BE(port, 1);
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this.write(outBuffer);
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break;
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case 'cancel-tcpip-forward':
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break;
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case 'udp-send-to@amt.intel.com':
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break;
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default:
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//console.log("Unknown APF_GLOBAL_REQUEST for: " + name);
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break;
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}
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break;
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case APF_CHANNEL_OPEN_CONFIRMATION:
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var rChannel = chunk.readUInt32BE(1);
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var sChannel = chunk.readUInt32BE(5);
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var wSize = chunk.readUInt32BE(9);
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//console.log('rChannel/' + rChannel + ', sChannel/' + sChannel + ', wSize/' + wSize);
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if (this.sockets[rChannel] != undefined)
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{
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this.sockets[rChannel].lme.amtId = sChannel;
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this.sockets[rChannel].lme.rxWindow = wSize;
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this.sockets[rChannel].lme.txWindow = wSize;
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this.sockets[rChannel].lme.LME_CHANNEL_STATUS = 'LME_CS_CONNECTED';
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//console.log('LME_CS_CONNECTED');
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this.sockets[rChannel].bufferedStream = new stream_bufferedWrite();
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this.sockets[rChannel].bufferedStream.socket = this.sockets[rChannel];
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this.sockets[rChannel].bufferedStream.on('readable', function ()
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{
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if(this.socket.lme.txWindow > 0)
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{
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var buffer = this.read(this.socket.lme.txWindow);
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var packet = Buffer.alloc(9 + buffer.length);
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packet.writeUInt8(APF_CHANNEL_DATA, 0);
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packet.writeUInt32BE(this.socket.lme.amtId, 1);
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packet.writeUInt32BE(buffer.length, 5);
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buffer.copy(packet, 9);
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this.socket.lme.txWindow -= buffer.length;
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this.socket.HECI.write(packet);
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}
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});
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this.sockets[rChannel].bufferedStream.on('drain', function ()
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{
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this.socket.resume();
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});
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this.sockets[rChannel].on('data', function (chunk)
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{
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if (!this.bufferedStream.write(chunk)) { this.pause(); }
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});
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this.sockets[rChannel].on('end', function ()
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{
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var outBuffer = Buffer.alloc(5);
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outBuffer.writeUInt8(APF_CHANNEL_CLOSE, 0);
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outBuffer.writeUInt32BE(this.lme.amtId, 1);
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this.HECI.write(outBuffer);
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});
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this.sockets[rChannel].resume();
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}
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break;
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case APF_PROTOCOLVERSION:
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var major = chunk.readUInt32BE(1);
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var minor = chunk.readUInt32BE(5);
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var reason = chunk.readUInt32BE(9);
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var outBuffer = Buffer.alloc(93);
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outBuffer.writeUInt8(192, 0);
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outBuffer.writeUInt32BE(1, 1);
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outBuffer.writeUInt32BE(0, 5);
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outBuffer.writeUInt32BE(reason, 9);
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//console.log('Answering PROTOCOL_VERSION');
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this.write(outBuffer);
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break;
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case APF_CHANNEL_WINDOW_ADJUST:
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var rChannelId = chunk.readUInt32BE(1);
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var bytesToAdd = chunk.readUInt32BE(5);
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if (this.sockets[rChannelId] != undefined)
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{
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this.sockets[rChannelId].lme.txWindow += bytesToAdd;
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if (!this.sockets[rChannelId].bufferedStream.isEmpty() && this.sockets[rChannelId].bufferedStream.isWaiting())
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{
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this.sockets[rChannelId].bufferedStream.emit('readable');
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}
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}
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else
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{
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//console.log('Unknown Recipient ID/' + rChannelId + ' for APF_CHANNEL_WINDOW_ADJUST');
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}
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break;
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case APF_CHANNEL_DATA:
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var rChannelId = chunk.readUInt32BE(1);
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var dataLen = chunk.readUInt32BE(5);
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var data = chunk.slice(9, 9 + dataLen);
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if (this.sockets[rChannelId] != undefined)
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{
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this.sockets[rChannelId].pendingBytes.push(data.length);
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this.sockets[rChannelId].write(data, function ()
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{
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var written = this.pendingBytes.shift();
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var outBuffer = Buffer.alloc(9);
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outBuffer.writeUInt8(APF_CHANNEL_WINDOW_ADJUST, 0);
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outBuffer.writeUInt32BE(this.lme.amtId, 1);
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outBuffer.writeUInt32BE(written, 5);
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this.HECI.write(outBuffer);
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});
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}
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else
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{
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//console.log('Unknown Recipient ID/' + rChannelId + ' for APF_CHANNEL_DATA');
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}
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break;
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case APF_CHANNEL_CLOSE:
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var rChannelId = chunk.readUInt32BE(1);
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if (this.sockets[rChannelId] != undefined)
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{
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this.sockets[rChannelId].end();
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var amtId = this.sockets[rChannelId].lme.amtId;
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var buffer = Buffer.alloc(5);
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delete this.sockets[rChannelId];
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buffer.writeUInt8(APF_CHANNEL_CLOSE, 0);
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buffer.writeUInt32BE(amtId, 1);
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this.write(buffer);
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}
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else
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{
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//console.log('Unknown Recipient ID/' + rChannelId + ' for APF_CHANNEL_CLOSE');
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}
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break;
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}
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});
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});
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this.bindDuplexStream = function (duplexStream, remoteFamily, localPort)
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{
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var socket = duplexStream;
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//console.log('New [' + remoteFamily + '] Virtual Connection/' + socket.localPort);
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socket.pendingBytes = [];
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socket.HECI = this._LME;
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socket.LMS = this;
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socket.lme = new lme_object();
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socket.lme.Socket = socket;
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var buffer = new MemoryStream();
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buffer.writeUInt8(0x5A);
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buffer.writeUInt32BE(15);
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buffer.write('forwarded-tcpip');
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buffer.writeUInt32BE(socket.lme.ourId);
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buffer.writeUInt32BE(this.INITIAL_RXWINDOW_SIZE);
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buffer.writeUInt32BE(0xFFFFFFFF);
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for (var i = 0; i < 2; ++i)
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{
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if (remoteFamily == 'IPv6')
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{
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buffer.writeUInt32BE(3);
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buffer.write('::1');
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}
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else
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{
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buffer.writeUInt32BE(9);
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buffer.write('127.0.0.1');
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}
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buffer.writeUInt32BE(localPort);
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}
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this._LME.write(buffer.buffer);
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if (this._LME.sockets == undefined) { this._LME.sockets = {}; }
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this._LME.sockets[socket.lme.ourId] = socket;
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socket.pause();
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};
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this._LME.connect(heci.GUIDS.LME, { noPipeline: 0 });
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}
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module.exports = lme_heci;
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