telebit.js/lib/sorting-hat.js

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'use strict';
var os = require('os');
var path = require('path');
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module.exports.print = function (config) {
var services = { https: {}, http: {}, tcp: {} };
// Note: the remote needs to know:
// what servernames to forward
// what ports to forward
// what udp ports to forward
// redirect http to https automatically
// redirect www to nowww automatically
if (config.http) {
Object.keys(config.http).forEach(function (hostname) {
if ('*' === hostname) {
config.servernames.forEach(function (servername) {
services.https[servername] = config.http[hostname];
services.http[servername] = 'redirect-https';
});
return;
}
services.https[hostname] = config.http[hostname];
services.http[hostname] = 'redirect-https';
});
}
/*
Object.keys(config.localPorts).forEach(function (port) {
var proto = config.localPorts[port];
if (!proto) { return; }
if ('http' === proto) {
config.servernames.forEach(function (servername) {
services.http[servername] = port;
});
return;
}
if ('https' === proto) {
config.servernames.forEach(function (servername) {
services.https[servername] = port;
});
return;
}
if (true === proto) { proto = 'tcp'; }
if ('tcp' !== proto) { throw new Error("unsupported protocol '" + proto + "'"); }
//services[proxy.protocol]['*'] = proxy.port;
//services[proxy.protocol][proxy.hostname] = proxy.port;
services[proto]['*'] = port;
});
*/
Object.keys(services).forEach(function (protocol) {
var subServices = services[protocol];
Object.keys(subServices).forEach(function (hostname) {
console.info('[local proxy]', protocol + '://' + hostname + ' => ' + subServices[hostname]);
});
});
console.info('');
};
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module.exports.assign = function (state, tun, cb) {
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console.log('first message from', tun);
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var net = state.net || require('net');
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function trySsh(tun, cb) {
// https://security.stackexchange.com/questions/43231/plausibly-deniable-ssh-does-it-make-sense?rq=1
// https://tools.ietf.org/html/rfc4253#section-4.2
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var sshPort;
if (-1 !== ['true', 'enable', 'auto', 'on'].indexOf(state.config.sshAuto)) {
sshPort = 22;
} else {
sshPort = parseInt(state.config.sshAuto, 10);
}
if (!sshPort || 'SSH-2.0-' !== tun.data.slice(0, 8).toString()) {
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cb(null, false);
return;
}
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cb(null, getNetConn(sshPort));
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}
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var handlers = {};
handlers.http = function (socket) {
if (!state.greenlock) {
state.greenlock = require('greenlock').create(state.greenlockConfig);
}
if (!state.httpRedirectServer) {
state.redirectHttps = require('redirect-https')();
state.httpRedirectServer = require('http').createServer(state.greenlock.middleware(state.redirectHttps));
}
state.httpRedirectServer.emit('connection', socket);
};
handlers.https = function (tlsSocket) {
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console.log('Encrypted', tlsSocket.encrypted, tlsSocket.remoteAddress, tlsSocket.remotePort);
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if (!state.defaultHttpServer) {
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state._finalHandler = require('finalhandler');
state._serveStatic = require('serve-static');
state._defaultServe = state._serveStatic(path.join(__dirname, 'html'));
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state.defaultHttpServer = require('http').createServer(function (req, res) {
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state._defaultServe(req, res, state._finalHandler(req, res));
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});
}
state.defaultHttpServer.emit('connection', tlsSocket);
};
function getNetConn(port) {
var netOpts = {
port: port
, host: '127.0.0.1'
, servername: tun.name
, name: tun.name
, serviceport: tun.serviceport
, data: tun.data
, remoteFamily: tun.family
, remoteAddress: tun.address
, remotePort: tun.port
};
var conn = net.createConnection(netOpts, function () {
// this will happen before 'data' or 'readable' is triggered
// We use the data from the netOpts object so that the createConnection function has
// the oppurtunity of removing/changing it if it wants/needs to handle it differently.
});
return conn;
}
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function redirectHttp(cb) {
var socketPair = require('socket-pair');
var conn = socketPair.create(function (err, other) {
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if (err) { cb(err); return; }
handlers.http(other);
cb(null, conn);
});
//if (tun.data) { conn.write(tun.data); }
return conn;
}
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function echoTcp(cb) {
var socketPair = require('socket-pair');
var conn = socketPair.create(function (err, other) {
if (err) { cb(err); return; }
other.on('data', function (chunk) {
other.write(chunk);
});
other.on('end', function () {
other.end();
});
cb(null, conn);
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other.write("\n" +
[ "[Telebit Echo Server] v1.0"
, "To configure tcp run the following:"
, "\ttelebit tcp <port number or module name>"
, "\tex: telebit tcp 5050"
, "\tex: telebit tcp /path/to/module"
, "\tex: telebit tcp none"
].join("\n") + "\n\n");
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});
//if (tun.data) { conn.write(tun.data); }
return conn;
}
function defineProps(other, tun) {
Object.defineProperty(other, 'remoteFamily', {
enumerable: false,
configurable: true,
get: function() {
return tun.family;
}
});
Object.defineProperty(other, 'remoteAddress', {
enumerable: false,
configurable: true,
get: function() {
return tun.address;
}
});
Object.defineProperty(other, 'remotePort', {
enumerable: false,
configurable: true,
get: function() {
return parseInt(tun.port);
}
});
Object.defineProperty(other, 'localPort', {
enumerable: false,
configurable: true,
get: function() {
return parseInt(tun.serviceport);
}
});
}
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function invokeTcpHandler(conf, socket, tun, id, cb) {
var conn;
if (parseInt(conf.handler, 10)) {
conn = getNetConn(conf.handler);
cb(null, conn);
return conn;
}
var handle = tun.port;
var handler;
var handlerpath = conf.handler;
var homedir = os.homedir();
var localshare = path.join(homedir, '.local/share/telebit/apps');
if (/^~/.test(handlerpath)) {
handlerpath = path.join(homedir, handlerpath.replace(/^~(\/?)/, ''));
}
try {
handler = require(handlerpath);
console.info("Handling '" + handle + ":" + id + "' with '" + handlerpath + "'");
} catch(e1) {
try {
handler = require(path.join(localshare, handlerpath));
console.info("Handling '" + handle + ":" + id + "' with '" + handlerpath + "'");
} catch(e2) {
console.error("Failed to require('" + handlerpath + "'):", e1.message);
console.error("Failed to require('" + path.join(localshare, handlerpath) + "'):", e2.message);
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console.warn("Using default handler for '" + handle + ":" + id + "'");
echoTcp(cb);
}
}
var socketPair = require('socket-pair');
conn = socketPair.create(function (err, other) {
handler(other, tun, id);
cb(null, conn);
});
return conn;
}
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var handlerservers = {};
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function invokeHandler(conf, tlsSocket, tun, id) {
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var conn;
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if (parseInt(conf.handler, 10)) {
// TODO http-proxy with proper headers and ws support
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conn = getNetConn(conf.handler);
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console.info("Port-Forwarding '" + (tun.name || tun.serviceport) + "' to '" + conf.handler + "'");
conn.pipe(tlsSocket);
tlsSocket.pipe(conn);
return;
}
var handle = tun.name || tun.port;
var handler;
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var handlerpath = conf.handler;
var homedir = os.homedir();
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var localshare = path.join(homedir, '.local/share/telebit/apps');
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var http = require('http');
// 1. No modification handlerpath may be an aboslute path
// 2. it may be relative to a user home directory
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// 3. it may be relative to a user ~/local/share
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tlsSocket._tun = tun;
tlsSocket._id = id;
if (handlerservers[conf.handler]) {
handlerservers[conf.handler].emit('connection', tlsSocket);
return;
}
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if (/^~/.test(handlerpath)) {
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// TODO have the telebit remote tell which user is running
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handlerpath = path.join(homedir, handlerpath.replace(/^~(\/?)/, ''));
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}
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try {
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handler = require(handlerpath);
console.info("Handling '" + handle + ":" + id + "' with '" + handlerpath + "'");
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} catch(e1) {
try {
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handler = require(path.join(localshare, handlerpath));
console.info("Handling '" + handle + ":" + id + "' with '" + handlerpath + "'");
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} catch(e2) {
console.error("Failed to require('" + handlerpath + "'):", e1.message);
console.error("Failed to require('" + path.join(localshare, handlerpath) + "'):", e2.message);
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console.warn("Using default handler for '" + handle + ":" + id + "'");
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handler = null;
// fallthru
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}
}
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if (handler) {
handlerservers[conf.handler] = http.createServer(handler);
handlerservers[conf.handler].emit('connection', tlsSocket);
return;
}
handlers.https(tlsSocket, tun, id);
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}
function terminateTls(tun, cb) {
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var socketPair = require('socket-pair');
var conn = socketPair.create(function (err, other) {
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if (err) { cb(err); return; }
//console.log('[hit tcp connection]', other.remoteFamily, other.remoteAddress, other.remotePort, other.localPort);
defineProps(other, tun);
//console.log('[hit tcp connection]', other.remoteFamily, other.remoteAddress, other.remotePort, other.localPort);
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if (!state.greenlock) {
state.greenlock = require('greenlock').create(state.greenlockConfig);
}
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if (!state.terminatorServer) {
state.terminatorServer = require('tls').createServer(state.greenlock.tlsOptions, function (tlsSocket) {
var Packer = require('proxy-packer');
var addr = Packer.socketToAddr(tlsSocket);
var id = Packer.addrToId(addr);
defineProps(tlsSocket, addr);
//console.log('[hit tls server]', tlsSocket.remoteFamily, tlsSocket.remoteAddress, tlsSocket.remotePort, tlsSocket.localPort);
//console.log(addr);
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var conf = state.servernames[tlsSocket.servername];
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tlsSocket.once('data', function (firstChunk) {
tlsSocket.pause();
//tlsSocket.unshift(firstChunk);
tlsSocket._handle.onread(firstChunk.length, firstChunk);
trySsh({ data: firstChunk }, function (err, conn) {
process.nextTick(function () { tlsSocket.resume(); });
if (conn) {
conn.pipe(tlsSocket);
tlsSocket.pipe(conn);
return;
}
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if (!conf || !conf.handler || 'none' === conf.handler) {
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console.log('https default handler');
handlers.https(tlsSocket);
return;
}
console.log('https invokeHandler');
invokeHandler(conf, tlsSocket, tun, id);
});
});
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});
}
//console.log('[hit tcp connection]', other.remoteFamily, other.remoteAddress, other.remotePort, other.localPort);
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state.terminatorServer.emit('connection', other);
cb(null, conn);
});
//if (tun.data) { conn.write(tun.data); }
return conn;
}
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var handled;
if (!tun.name && !tun.serviceport) {
console.log('tun:\n',tun);
//console.warn(tun.data.toString());
cb(new Error("No routing information for ':tun_id'. Missing both 'name' and 'serviceport'."));
return;
}
if ('http' === tun.service || 'https' === tun.service) {
if (!tun.name) {
cb(new Error("No routing information for ':tun_id'. Service '" + tun.service + "' is missing 'name'."));
return;
}
}
if ('http' === tun.service) {
// TODO match *.example.com
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handled = Object.keys(state.servernames).some(function (sn) {
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if (sn !== tun.name) { return; }
console.log('Found config match for PLAIN', tun.name);
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if (!state.servernames[sn]) { return; }
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if (false === state.servernames[sn].terminate) {
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cb(new Error("insecure http not supported yet"));
return true;
}
console.log('Redirecting HTPTP for', tun.name);
redirectHttp(cb);
return true;
});
if (!handled) {
redirectHttp(cb);
}
return;
}
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if ('https' === tun.service) {
// TODO match *.example.com
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handled = Object.keys(state.servernames).some(function (sn) {
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if (sn !== tun.name) { return; }
console.log('Found config match for TLS', tun.name);
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if (!state.servernames[sn]) { return; }
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if (false === state.servernames[sn].terminate) {
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cb(new Error("insecure http not supported yet"));
return true;
}
console.log('Terminating TLS for', tun.name);
terminateTls(tun, cb);
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return true;
});
if (!handled) {
terminateTls(tun, cb);
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}
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return;
}
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if ('tcp' === tun.service) {
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trySsh(tun, function (err, conn) {
if (conn) { cb(null, conn); return; }
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// TODO add TCP handlers
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var conf = state.ports[tun.serviceport];
if (!conf || !conf.handler || 'none' === conf.handler) {
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console.log('Using echo server for tcp');
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echoTcp(cb);
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return;
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}
var Packer = require('proxy-packer');
//var addr = Packer.socketToAddr(conn);
var id = Packer.addrToId(tun);
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invokeTcpHandler(conf, conn, tun, id, cb);
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});
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return;
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}
console.warn("Unknown service '" + tun.service + "'");
/*
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var portList = state.services[service];
var port;
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port = portList[tun.name];
if (!port) {
// Check for any wildcard domains, sorted longest to shortest so the one with the
// biggest natural match will be found first.
Object.keys(portList).filter(function (pattern) {
return pattern[0] === '*' && pattern.length > 1;
}).sort(function (a, b) {
return b.length - a.length;
}).some(function (pattern) {
var subPiece = pattern.slice(1);
if (subPiece === tun.name.slice(-subPiece.length)) {
port = portList[pattern];
return true;
}
});
}
if (!port) {
port = portList['*'];
}
*/
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};