telebit-relay.js/wstunneld.js

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'use strict';
var net = require('net');
var tls = require('tls');
var http = require('http');
var sni = require('sni');
var url = require('url');
var jwt = require('jsonwebtoken');
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var packer = require('tunnel-packer');
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var WebSocketServer = require('ws').Server;
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module.exports.create = function (copts) {
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function onWsConnection(ws) {
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var location = url.parse(ws.upgradeReq.url, true);
//var token = jwt.decode(location.query.access_token);
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var token;
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try {
token = jwt.verify(location.query.access_token, secret);
} catch(e) {
token = null;
}
/*
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if (!token || !token.name) {
console.log('location, token');
console.log(location.query.access_token);
console.log(token);
}
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*/
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if (!token) {
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ws.send(JSON.stringify({ error: { message: "invalid access token", code: "E_INVALID_TOKEN" } }));
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ws.close();
return;
}
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if (!Array.isArray(token.domains)) {
if ('string' === typeof token.name) {
token.domains = [ token.name ];
}
}
if (!Array.isArray(token.domains)) {
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ws.send(JSON.stringify({ error: { message: "invalid server name", code: "E_INVALID_NAME" } }));
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ws.close();
return;
}
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var remote;
token.domains.some(function (domainname) {
remote = remotes[domainname];
return remote;
});
remote = remote || {};
token.domains.forEach(function (domainname) {
remotes[domainname] = remote;
});
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var handlers = {
onmessage: function (opts) {
// opts.data
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var cid = packer.addrToId(opts);
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var cstream = remote.clients[cid];
console.log("remote '" + remote.servername + " : " + remote.id + "' has data for '" + cid + "'", opts.data.byteLength);
if (!cstream) {
remote.ws.send(packer.pack(opts, null, 'error'));
return;
}
cstream.browser.write(opts.data);
}
, onend: function (opts) {
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var cid = packer.addrToId(opts);
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console.log('[TunnelEnd]', cid);
handlers._onend(cid);
}
, onerror: function (opts) {
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var cid = packer.addrToId(opts);
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console.log('[TunnelError]', cid);
handlers._onend(cid);
}
, _onend: function (cid) {
var c = remote.clients[cid];
delete remote.clients[cid];
try {
c.browser.end();
} catch(e) {
// ignore
}
try {
c.wrapped.end();
} catch(e) {
// ignore
}
}
};
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// TODO allow more than one remote per servername
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remote.ws = ws;
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remote.servername = token.domains.join(',');
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remote.id = packer.socketToId(ws.upgradeReq.socket);
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console.log("remote.id", remote.id);
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// TODO allow tls to be decrypted by server if client is actually a browser
// and we haven't implemented tls in the browser yet
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remote.decrypt = token.decrypt;
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// TODO how to allow a child process to communicate with this one?
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remote.clients = {};
remote.handle = { address: null, handle: null };
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remote.unpacker = packer.create(handlers);
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ws.on('message', function (chunk) {
console.log('message from home cloud to tunneler to browser', chunk.byteLength);
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//console.log(chunk.toString());
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remote.unpacker.fns.addChunk(chunk);
});
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ws.on('close', function () {
// the remote will handle closing its local connections
Object.keys(remote.clients).forEach(function (cid) {
try {
remote.clients[cid].browser.end();
} catch(e) {
// ignore
}
});
});
ws.on('error', function () {
// ignore
// the remote will retry if it wants to
});
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//store.set(token.name, remote.handle);
}
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function connectHttp(servername, socket) {
console.log("connectHttp('" + servername + "', socket)");
socket.__my_servername = servername;
httpServer.emit('connection', socket);
}
function connectHttps(servername, socket) {
// none of these methods work:
// httpsServer.emit('connection', socket); // this didn't work
// tlsServer.emit('connection', socket); // this didn't work either
//console.log('chunkLen', firstChunk.byteLength);
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var myDuplex = packer.Stream.create(socket);
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console.log('connectHttps servername', servername);
tls3000.emit('connection', myDuplex);
socket.on('data', function (chunk) {
console.log('[' + Date.now() + '] socket data', chunk.byteLength);
myDuplex.push(chunk);
});
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socket.on('error', function (err) {
console.error('[error] connectHttps TODO close');
console.error(err);
});
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}
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function pipeWs(servername, service, browser, remote) {
console.log('pipeWs');
//var remote = remotes[servername];
var ws = remote.ws;
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//var address = packer.socketToAddr(ws.upgradeReq.socket);
var baddress = packer.socketToAddr(browser);
var cid = packer.addrToId(baddress);
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console.log('servername:', servername);
console.log('service:', service);
baddress.service = service;
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var wrapForRemote = packer.Transform.create({
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id: cid
//, remoteId: remote.id
, address: baddress
, servername: servername
, service: service
});
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console.log('home-cloud is', packer.socketToId(remote.ws.upgradeReq.socket));
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console.log('browser is', cid);
var bstream = remote.clients[cid] = {
wrapped: browser.pipe(wrapForRemote)
, browser: browser
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, address: baddress
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};
//var bstream = remote.clients[cid] = wrapForRemote.pipe(browser);
bstream.wrapped.on('data', function (pchunk) {
// var chunk = socket.read();
console.log('[bstream] data from browser to tunneler', pchunk.byteLength);
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//console.log(JSON.stringify(pchunk.toString()));
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try {
ws.send(pchunk, { binary: true });
} catch(e) {
try {
bstream.browser.end();
} catch(e) {
// ignore
}
}
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});
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bstream.wrapped.on('error', function (err) {
console.error('[error] bstream.wrapped.error');
console.error(err);
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try {
ws.send(packer.pack(baddress, null, 'error'), { binary: true });
} catch(e) {
// ignore
}
try {
bstream.browser.end();
} catch(e) {
// ignore
}
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delete remote.clients[cid];
});
bstream.wrapped.on('end', function () {
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try {
ws.send(packer.pack(baddress, null, 'end'), { binary: true });
} catch(e) {
// ignore
}
try {
bstream.browser.end();
} catch(e) {
// ignore
}
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delete remote.clients[cid];
});
}
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function onTcpConnection(browser) {
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// this works when I put it here, but I don't know if it's tls yet here
// httpsServer.emit('connection', socket);
//tls3000.emit('connection', socket);
//var tlsSocket = new tls.TLSSocket(socket, { secureContext: tls.createSecureContext(tlsOpts) });
//tlsSocket.on('data', function (chunk) {
// console.log('dummy', chunk.byteLength);
//});
//return;
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browser.once('data', function (firstChunk) {
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// BUG XXX: this assumes that the packet won't be chunked smaller
// than the 'hello' or the point of the 'Host' header.
// This is fairly reasonable, but there are edge cases where
// it does not hold (such as manual debugging with telnet)
// and so it should be fixed at some point in the future
// defer after return (instead of being in many places)
process.nextTick(function () {
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browser.unshift(firstChunk);
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});
var service = 'tcp';
var servername;
var str;
var m;
function tryTls() {
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if (!servername || (-1 !== selfnames.indexOf(servername)) || !remotes[servername]) {
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console.log('this is a server or an unknown');
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connectHttps(servername, browser);
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return;
}
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console.log("pipeWs(servername, service, socket, remotes['" + servername + "'])");
pipeWs(servername, service, browser, remotes[servername]);
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}
// https://github.com/mscdex/httpolyglot/issues/3#issuecomment-173680155
if (22 === firstChunk[0]) {
// TLS
service = 'https';
servername = (sni(firstChunk)||'').toLowerCase();
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console.log("tls hello servername:", servername);
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tryTls();
return;
}
if (firstChunk[0] > 32 && firstChunk[0] < 127) {
str = firstChunk.toString();
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m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
servername = (m && m[1].toLowerCase() || '').split(':')[0];
console.log('servername', servername);
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if (/HTTP\//i.test(str)) {
service = 'http';
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if (/^\/\.well-known\/acme-challenge\//.test(str)) {
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// HTTP
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if (remotes[servername]) {
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pipeWs(servername, service, browser, remotes[servername]);
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return;
}
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connectHttp(servername, browser);
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}
else {
// redirect to https
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connectHttp(servername, browser);
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}
return;
}
}
console.error("Got unexpected connection", str);
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browser.write(JSON.stringify({ error: {
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message: "not sure what you were trying to do there..."
, code: 'E_INVALID_PROTOCOL' }
}));
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browser.end();
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});
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browser.on('error', function (err) {
console.error('[error] tcp socket raw TODO forward and close');
console.error(err);
});
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}
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var tlsOpts = copts.tlsOptions;
//var store = copts.store;
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var remotes = {};
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var selfnames = copts.servernames;
var secret = copts.secret;
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var httpServer = http.createServer(function (req, res) {
console.log('req.socket.encrypted', req.socket.encrypted);
res.end('Hello, World!');
});
var tls3000 = tls.createServer(tlsOpts, function (tlsSocket) {
console.log('tls connection');
// things get a little messed up here
httpServer.emit('connection', tlsSocket);
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});
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var wss = new WebSocketServer({ server: httpServer });
wss.on('connection', onWsConnection);
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copts.ports.forEach(function (port) {
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var tcp3000 = net.createServer();
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tcp3000.listen(port, function () {
console.log('listening on ' + port);
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});
tcp3000.on('connection', onTcpConnection);
});
};