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https://github.com/Ylianst/MeshCentral.git
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Added websocket device to browser frame forwarding, #4172
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Ylian Saint-Hilaire
parent
91dead8e84
commit
8a8d9869dd
108
apprelays.js
108
apprelays.js
@ -229,21 +229,29 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
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// Process a websocket request
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obj.processWebSocket = function (req, ws) {
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//console.log('processWebSocket', req.url);
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if (obj.relayActive == false) { console.log("ERROR: Attempt to use an unconnected tunnel"); return false; }
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parent.lastOperation = obj.lastOperation = Date.now();
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console.log('processWebSocket', req.url);
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// Mark this tunnel as being a web socket tunnel
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obj.isWebSocket = true;
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obj.isWebSocket = true;
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obj.ws = ws;
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// Pause the websocket until we get a tunnel connected
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obj.ws._socket.pause();
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// Remove the trailing '/.websocket' if needed
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if (req.url.endsWith('/.websocket')) { req.url = req.url.substring(0, req.url.length - 11); }
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if (obj.relayActive == false) { console.log("ERROR: Attempt to use an unconnected tunnel"); return false; }
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parent.lastOperation = obj.lastOperation = Date.now();
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// Construct the HTTP request and send it out
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var request = req.method + ' ' + req.url + ' HTTP/' + req.httpVersion + '\r\n';
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request += 'host: ' + obj.addr + ':' + obj.port + '\r\n';
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const blockedHeaders = ['origin', 'host', 'cookie']; // These are headers we do not forward
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const blockedHeaders = ['origin', 'host', 'cookie', 'sec-websocket-extensions']; // These are headers we do not forward
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for (var i in req.headers) { if (blockedHeaders.indexOf(i) == -1) { request += i + ': ' + req.headers[i] + '\r\n'; } }
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if (parent.webCookie != null) { request += 'cookie: ' + parent.webCookie + '\r\n' } // If we have a sessin cookie, use it.
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request += '\r\n';
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send(Buffer.from(request));
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}
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@ -397,7 +405,18 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
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// Check if this HTTP request has a body
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if ((obj.socketXHeader['connection'] != null) && (obj.socketXHeader['connection'].toLowerCase() == 'close')) { obj.socketParseState = 1; }
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if (obj.socketXHeader['content-length'] != null) { obj.socketParseState = 1; }
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if ((obj.socketXHeader["transfer-encoding"] != null) && (obj.socketXHeader["transfer-encoding"].toLowerCase() == 'chunked')) { obj.socketParseState = 1; }
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if ((obj.socketXHeader['transfer-encoding'] != null) && (obj.socketXHeader['transfer-encoding'].toLowerCase() == 'chunked')) { obj.socketParseState = 1; }
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if (obj.isWebSocket) {
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console.log('websocket', obj.socketXHeader);
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if ((obj.socketXHeader['connection'] != null) && (obj.socketXHeader['connection'].toLowerCase() == 'upgrade')) {
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console.log('websocket pass-thru');
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obj.socketParseState = 2; // Switch to decoding websocket frames
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obj.ws._socket.resume(); // Resume the browser's websocket
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} else {
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console.log('websocket failed');
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obj.close(); // Failed to upgrade to websocket
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}
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}
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// Forward the HTTP request into the tunnel, if no body is present, close the request.
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processHttpResponse(obj.socketXHeader, null, (obj.socketParseState == 0));
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@ -417,7 +436,8 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
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processHttpResponse(null, data, (obj.socketContentLengthRemaining == 0)); // Send any data we have, if we are done, signal the end of the response
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if (obj.socketContentLengthRemaining > 0) return; // If more data is needed, return now so we exit the while() loop.
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csize = 0; // We are done
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} else if ((obj.socketXHeader["transfer-encoding"] != null) && (obj.socketXHeader["transfer-encoding"].toLowerCase() == 'chunked')) {
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}
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else if ((obj.socketXHeader['transfer-encoding'] != null) && (obj.socketXHeader['transfer-encoding'].toLowerCase() == 'chunked')) {
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// The body is chunked
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var clen = obj.socketAccumulator.indexOf('\r\n');
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if (clen < 0) { return; } // Chunk length not found, exit now and get more data.
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@ -438,22 +458,78 @@ module.exports.CreateWebRelay = function (parent, db, args, domain) {
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if (obj.socketParseState == 2) {
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// We are in websocket pass-thru mode, decode the websocket frame
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if (obj.socketAccumulator.length < 2) return; // Need at least 2 bytes to decode a websocket header
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console.log('WebSocket frame', obj.socketAccumulator.length, Buffer.from(obj.socketAccumulator, 'binary'));
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//console.log('WebSocket frame', obj.socketAccumulator.length, Buffer.from(obj.socketAccumulator, 'binary'));
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// Decode the websocket frame
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const buf = Buffer.from(obj.socketAccumulator, 'binary');
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const fin = ((buf[0] & 0x80) != 0);
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const rsv = ((buf[0] & 0x70) != 0);
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const op = buf[0] & 0x0F;
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const mask = ((buf[1] & 0x80) != 0);
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const len = buf[1] & 0x7F;
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console.log('fin', fin);
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console.log('op', op);
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console.log('mask', mask);
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console.log('len', len);
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var len = buf[1] & 0x7F;
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// Connection close
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if ((fin == true) || (op == 8)) { obj.close(); }
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// Calculate the total length
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var payload = null;
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if (len < 126) {
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// 1 byte length
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if (buf.length < (2 + len)) return; // Insuffisent data
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payload = buf.slice(2, 2 + len);
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obj.socketAccumulator = obj.socketAccumulator.substring(2 + len); // Remove data from accumulator
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} else if (len == 126) {
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// 2 byte length
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if (buf.length < 4) return;
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len = buf.readInt16BE(2);
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if (buf.length < (4 + len)) return; // Insuffisent data
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payload = buf.slice(4, 4 + len);
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obj.socketAccumulator = obj.socketAccumulator.substring(4 + len); // Remove data from accumulator
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} if (len == 127) {
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// 8 byte length
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if (buf.length < 10) return;
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len = buf.readInt32BE(2);
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if (len > 0) { obj.close(); return; } // This frame is larger than 4 gigabyte, close the connection.
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len = buf.readInt32BE(6);
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if (buf.length < (10 + len)) return; // Insuffisent data
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payload = buf.slice(10, 10 + len);
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obj.socketAccumulator = obj.socketAccumulator.substring(10 + len); // Remove data from accumulator
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}
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if (buf.length < len) return;
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return;
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// If the mask or reserved bit are true, we are not decoding this right, close the connection.
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if ((mask == true) || (rsv == true)) { obj.close(); return; }
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// TODO: If FIN is not set, we need to add support for continue frames
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// Perform operation
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switch (op) {
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case 0: { // Continue frame
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//console.log('continue', payload.length);
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break;
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}
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case 1: { // Text frame
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//console.log('text', payload.length);
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try { obj.ws.send(payload.toString('binary')); } catch (ex) { }
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break;
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}
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case 2: { // Binary frame
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//console.log('binary', payload.length);
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try { obj.ws.send(payload); } catch (ex) { }
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break;
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}
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case 8: { // Connection close
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obj.close();
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return;
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}
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case 9: { // Ping frame
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//console.log('ping', payload.length);
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// TODO
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break;
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}
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case 10: { // Pong frame
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//console.log('pong', payload.length);
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// TODO
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break;
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}
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}
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}
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}
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}
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