499 lines
16 KiB
JavaScript
499 lines
16 KiB
JavaScript
'use strict';
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var sni = require('sni');
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var url = require('url');
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var PromiseA = require('bluebird');
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var jwt = require('jsonwebtoken');
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var packer = require('tunnel-packer');
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function timeoutPromise(duration) {
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return new PromiseA(function (resolve) {
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setTimeout(resolve, duration);
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});
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}
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var Devices = {};
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Devices.add = function (store, servername, newDevice) {
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var devices = store[servername] || [];
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devices.push(newDevice);
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store[servername] = devices;
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};
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Devices.remove = function (store, servername, device) {
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var devices = store[servername] || [];
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var index = devices.indexOf(device);
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if (index < 0) {
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console.warn('attempted to remove non-present device', device.deviceId, 'from', servername);
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return null;
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}
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return devices.splice(index, 1)[0];
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};
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Devices.list = function (store, servername) {
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if (store[servername] && store[servername].length) {
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return store[servername];
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}
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// There wasn't an exact match so check any of the wildcard domains, sorted longest
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// first so the one with the biggest natural match with be found first.
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var deviceList = [];
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Object.keys(store).filter(function (pattern) {
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return pattern[0] === '*' && store[pattern].length;
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}).sort(function (a, b) {
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return b.length - a.length;
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}).some(function (pattern) {
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var subPiece = pattern.slice(1);
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if (subPiece === servername.slice(-subPiece.length)) {
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console.log('"'+servername+'" matches "'+pattern+'"');
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deviceList = store[pattern];
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return true;
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}
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});
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return deviceList;
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};
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Devices.exist = function (store, servername) {
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return !!(Devices.list(store, servername).length);
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};
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Devices.next = function (store, servername) {
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var devices = Devices.list(store, servername);
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var device;
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if (devices._index >= devices.length) {
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devices._index = 0;
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}
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device = devices[devices._index || 0];
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devices._index = (devices._index || 0) + 1;
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return device;
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};
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module.exports.store = { Devices: Devices };
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module.exports.create = function (copts) {
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var deviceLists = {};
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var activityTimeout = copts.activityTimeout || 2*60*1000;
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var pongTimeout = copts.pongTimeout || 10*1000;
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function onWsConnection(ws) {
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var socketId = packer.socketToId(ws.upgradeReq.socket);
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var remotes = {};
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function logName() {
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var result = Object.keys(remotes).map(function (jwtoken) {
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return remotes[jwtoken].deviceId;
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}).join(';');
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return result || socketId;
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}
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function closeBrowserConn(cid) {
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var remote;
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Object.keys(remotes).some(function (jwtoken) {
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if (remotes[jwtoken].clients[cid]) {
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remote = remotes[jwtoken];
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return true;
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}
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});
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if (!remote) {
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return;
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}
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PromiseA.resolve()
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.then(function () {
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remote.clients[cid].end();
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return timeoutPromise(500);
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})
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.then(function () {
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if (remote.clients[cid]) {
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console.warn(cid, 'browser connection still present after calling `end`');
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remote.clients[cid].destroy();
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return timeoutPromise(500);
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}
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})
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.then(function () {
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if (remote.clients[cid]) {
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console.error(cid, 'browser connection still present after calling `destroy`');
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delete remote.clients[cid];
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}
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})
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.catch(function (err) {
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console.warn('failed to close browser connection', cid, err);
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})
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;
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}
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function addToken(jwtoken) {
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if (remotes[jwtoken]) {
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// return { message: "token sent multiple times", code: "E_TOKEN_REPEAT" };
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return null;
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}
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var token;
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try {
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token = jwt.verify(jwtoken, copts.secret);
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} catch (e) {
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token = null;
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}
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if (!token) {
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return { message: "invalid access token", code: "E_INVALID_TOKEN" };
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}
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if (!Array.isArray(token.domains)) {
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if ('string' === typeof token.name) {
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token.domains = [ token.name ];
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}
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}
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if (!Array.isArray(token.domains) || !token.domains.length) {
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return { message: "invalid server name", code: "E_INVALID_NAME" };
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}
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if (token.domains.some(function (name) { return typeof name !== 'string'; })) {
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return { message: "invalid server name", code: "E_INVALID_NAME" };
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}
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// Add the custom properties we need to manage this remote, then add it to all the relevant
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// domains and the list of all this websocket's remotes.
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token.deviceId = (token.device && (token.device.id || token.device.hostname)) || token.domains.join(',');
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token.ws = ws;
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token.clients = {};
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token.domains.forEach(function (domainname) {
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console.log('domainname', domainname);
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Devices.add(deviceLists, domainname, token);
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});
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remotes[jwtoken] = token;
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console.log("added token '" + token.deviceId + "' to websocket", socketId);
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return null;
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}
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function removeToken(jwtoken) {
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var remote = remotes[jwtoken];
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if (!remote) {
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return { message: 'specified token not present', code: 'E_INVALID_TOKEN'};
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}
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// Prevent any more browser connections being sent to this remote, and any existing
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// connections from trying to send more data across the connection.
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remote.domains.forEach(function (domainname) {
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Devices.remove(deviceLists, domainname, remote);
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});
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remote.ws = null;
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// Close all of the existing browser connections associated with this websocket connection.
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Object.keys(remote.clients).forEach(function (cid) {
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closeBrowserConn(cid);
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});
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delete remotes[jwtoken];
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console.log("removed token '" + remote.deviceId + "' from websocket", socketId);
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return null;
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}
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var firstToken;
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var authn = (ws.upgradeReq.headers.authorization||'').split(/\s+/);
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if (authn[0] && 'basic' === authn[0].toLowerCase()) {
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try {
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authn = new Buffer(authn[1], 'base64').toString('ascii').split(':');
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firstToken = authn[1];
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} catch (err) { }
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}
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if (!firstToken) {
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firstToken = url.parse(ws.upgradeReq.url, true).query.access_token;
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}
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if (firstToken) {
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var err = addToken(firstToken);
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if (err) {
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ws.send(packer.pack(null, [0, err], 'control'));
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ws.close();
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return;
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}
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}
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var commandHandlers = {
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add_token: addToken
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, delete_token: function (token) {
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if (token !== '*') {
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return removeToken(token);
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}
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var err;
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Object.keys(remotes).some(function (jwtoken) {
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err = removeToken(jwtoken);
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return err;
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});
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return err;
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}
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};
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var packerHandlers = {
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oncontrol: function (opts) {
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var cmd, err;
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try {
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cmd = JSON.parse(opts.data.toString());
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} catch (err) {}
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if (!Array.isArray(cmd) || typeof cmd[0] !== 'number') {
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var msg = 'received bad command "' + opts.data.toString() + '"';
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console.warn(msg, 'from websocket', socketId);
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ws.send(packer.pack(null, [0, {message: msg, code: 'E_BAD_COMMAND'}], 'control'));
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return;
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}
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if (cmd[0] < 0) {
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// We only ever send one command and we send it once, so we just hard coded the ID as 1.
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if (cmd[0] === -1) {
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if (cmd[1]) {
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console.log('received error response to hello from', socketId, cmd[1]);
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}
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}
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else {
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console.warn('received response to unknown command', cmd, 'from', socketId);
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}
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return;
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}
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if (cmd[0] === 0) {
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console.warn('received dis-associated error from', socketId, cmd[1]);
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return;
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}
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if (commandHandlers[cmd[1]]) {
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err = commandHandlers[cmd[1]].apply(null, cmd.slice(2));
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}
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else {
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err = { message: 'unknown command "'+cmd[1]+'"', code: 'E_UNKNOWN_COMMAND' };
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}
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ws.send(packer.pack(null, [-cmd[0], err], 'control'));
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}
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, onmessage: function (opts) {
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var cid = packer.addrToId(opts);
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console.log("remote '" + logName() + "' has data for '" + cid + "'", opts.data.byteLength);
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var browserConn;
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Object.keys(remotes).some(function (jwtoken) {
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if (remotes[jwtoken].clients[cid]) {
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browserConn = remotes[jwtoken].clients[cid];
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return true;
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}
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});
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if (browserConn) {
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browserConn.write(opts.data);
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}
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else {
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ws.send(packer.pack(opts, null, 'error'));
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}
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}
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, onend: function (opts) {
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var cid = packer.addrToId(opts);
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console.log('[TunnelEnd]', cid);
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closeBrowserConn(cid);
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}
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, onerror: function (opts) {
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var cid = packer.addrToId(opts);
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console.log('[TunnelError]', cid);
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closeBrowserConn(cid);
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}
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};
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var unpacker = packer.create(packerHandlers);
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var lastActivity = Date.now();
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var timeoutId;
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function refreshTimeout() {
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lastActivity = Date.now();
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}
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function checkTimeout() {
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// Determine how long the connection has been "silent", ie no activity.
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var silent = Date.now() - lastActivity;
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// If we have had activity within the last activityTimeout then all we need to do is
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// call this function again at the soonest time when the connection could be timed out.
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if (silent < activityTimeout) {
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timeoutId = setTimeout(checkTimeout, activityTimeout-silent);
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}
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// Otherwise we check to see if the pong has also timed out, and if not we send a ping
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// and call this function again when the pong will have timed out.
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else if (silent < activityTimeout + pongTimeout) {
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console.log('pinging', logName());
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try {
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ws.ping();
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} catch (err) {
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console.warn('failed to ping home cloud', logName());
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}
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timeoutId = setTimeout(checkTimeout, pongTimeout);
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}
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// Last case means the ping we sent before didn't get a response soon enough, so we
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// need to close the websocket connection.
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else {
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console.log('home cloud', logName(), 'connection timed out');
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ws.close(1013, 'connection timeout');
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}
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}
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timeoutId = setTimeout(checkTimeout, activityTimeout);
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// Note that our websocket library automatically handles pong responses on ping requests
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// before it even emits the event.
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ws.on('ping', refreshTimeout);
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ws.on('pong', refreshTimeout);
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ws.on('message', function forwardMessage(chunk) {
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refreshTimeout();
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console.log('message from home cloud to tunneler to browser', chunk.byteLength);
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//console.log(chunk.toString());
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unpacker.fns.addChunk(chunk);
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});
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function hangup() {
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clearTimeout(timeoutId);
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console.log('home cloud', logName(), 'connection closing');
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Object.keys(remotes).forEach(function (jwtoken) {
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removeToken(jwtoken);
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});
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ws.terminate();
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}
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ws.on('close', hangup);
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ws.on('error', hangup);
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// We only ever send one command and we send it once, so we just hard code the ID as 1
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ws.send(packer.pack(null, [1, 'hello', [unpacker._version], Object.keys(commandHandlers)], 'control'));
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}
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function pipeWs(servername, service, browserConn, remote) {
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console.log('[pipeWs] servername:', servername, 'service:', service);
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var browserAddr = packer.socketToAddr(browserConn);
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browserAddr.service = service;
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var cid = packer.addrToId(browserAddr);
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console.log('[pipeWs] browser is', cid, 'home-cloud is', packer.socketToId(remote.ws.upgradeReq.socket));
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function sendWs(data, serviceOverride) {
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if (remote.ws) {
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try {
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remote.ws.send(packer.pack(browserAddr, data, serviceOverride), { binary: true });
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} catch (err) {
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console.warn('[pipeWs] error sending websocket message', err);
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}
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}
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}
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remote.clients[cid] = browserConn;
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browserConn.on('data', function (chunk) {
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console.log('[pipeWs] data from browser to tunneler', chunk.byteLength);
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sendWs(chunk);
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});
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browserConn.on('error', function (err) {
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console.warn('[pipeWs] browser connection error', err);
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});
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browserConn.on('close', function (hadErr) {
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console.log('[pipeWs] browser connection closing');
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sendWs(null, hadErr ? 'error': 'end');
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delete remote.clients[cid];
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});
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}
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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
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// httpsServer.emit('connection', socket);
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//tls3000.emit('connection', socket);
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//var tlsSocket = new tls.TLSSocket(socket, { secureContext: tls.createSecureContext(tlsOpts) });
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//tlsSocket.on('data', function (chunk) {
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// console.log('dummy', chunk.byteLength);
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//});
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//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
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// than the 'hello' or the point of the 'Host' header.
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// This is fairly reasonable, but there are edge cases where
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// it does not hold (such as manual debugging with telnet)
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// and so it should be fixed at some point in the future
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// defer after return (instead of being in many places)
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process.nextTick(function () {
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browser.unshift(firstChunk);
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});
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var service = 'tcp';
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var servername;
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var str;
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var m;
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function tryTls() {
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if (-1 !== copts.servernames.indexOf(servername)) {
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console.log("Lock and load, admin interface time!");
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copts.httpsTunnel(servername, browser);
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return;
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}
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if (!servername) {
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console.log("No SNI was given, so there's nothing we can do here");
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copts.httpsInvalid(servername, browser);
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return;
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}
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var nextDevice = Devices.next(deviceLists, servername);
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if (!nextDevice) {
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console.log("No devices match the given servername");
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copts.httpsInvalid(servername, browser);
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return;
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}
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console.log("pipeWs(servername, service, socket, deviceLists['" + servername + "'])");
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pipeWs(servername, service, browser, nextDevice);
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}
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// https://github.com/mscdex/httpolyglot/issues/3#issuecomment-173680155
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if (22 === firstChunk[0]) {
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// TLS
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service = 'https';
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servername = (sni(firstChunk)||'').toLowerCase();
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console.log("tls hello servername:", servername);
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tryTls();
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return;
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}
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if (firstChunk[0] > 32 && firstChunk[0] < 127) {
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str = firstChunk.toString();
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m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
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servername = (m && m[1].toLowerCase() || '').split(':')[0];
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console.log('servername', servername);
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if (/HTTP\//i.test(str)) {
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service = 'http';
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// TODO disallow http entirely
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// /^\/\.well-known\/acme-challenge\//.test(str)
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if (/well-known/.test(str)) {
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// HTTP
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if (Devices.exist(deviceLists, servername)) {
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pipeWs(servername, service, browser, Devices.next(deviceLists, servername));
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return;
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}
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copts.handleHttp(servername, browser);
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}
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else {
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// redirect to https
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copts.handleInsecureHttp(servername, browser);
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}
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return;
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}
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}
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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..."
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, code: 'E_INVALID_PROTOCOL' }
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}));
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browser.end();
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});
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browser.on('error', function (err) {
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console.error('[error] tcp socket raw TODO forward and close');
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console.error(err);
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});
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}
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return {
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tcp: onTcpConnection
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, ws: onWsConnection
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, isClientDomain: Devices.exist.bind(null, deviceLists)
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};
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};
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