653 lines
23 KiB
JavaScript
653 lines
23 KiB
JavaScript
'use strict';
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var url = require('url');
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var sni = require('sni');
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var Packer = require('proxy-packer');
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var PortServers = {};
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var PromiseA;
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try {
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PromiseA = require('bluebird');
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} catch(e) {
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PromiseA = global.Promise;
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}
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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 = require('./device-tracker');
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var pipeWs = require('./pipe-ws.js');
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var Server = {
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_initCommandHandlers: function (state, srv) {
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var commandHandlers = {
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add_token: function addToken(newAuth) {
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return Server.addToken(state, srv, newAuth);
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}
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, delete_token: function (token) {
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return state.Promise.resolve(function () {
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var err;
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if (token !== '*') {
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err = Server.removeToken(state, srv, token);
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if (err) { return state.Promise.reject(err); }
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}
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Object.keys(srv.grants).some(function (jwtoken) {
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err = Server.removeToken(state, srv, jwtoken);
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return err;
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});
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if (err) { return state.Promise.reject(err); }
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return null;
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});
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}
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};
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commandHandlers.auth = commandHandlers.add_token;
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commandHandlers.authn = commandHandlers.add_token;
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commandHandlers.authz = commandHandlers.add_token;
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srv._commandHandlers = commandHandlers;
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}
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, _initPackerHandlers: function (state, srv) {
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var packerHandlers = {
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oncontrol: function (tun) {
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var cmd;
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try {
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cmd = JSON.parse(tun.data.toString());
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} catch (e) {}
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if (!Array.isArray(cmd) || typeof cmd[0] !== 'number') {
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var msg = 'received bad command "' + tun.data.toString() + '"';
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console.warn(msg, 'from websocket', srv.socketId);
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Server.sendTunnelMsg(srv, 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.warn('received error response to hello from', srv.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', srv.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', srv.socketId, cmd[1]);
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return;
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}
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function onSuccess() {
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Server.sendTunnelMsg(srv, null, [-cmd[0], null], 'control');
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}
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function onError(err) {
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Server.sendTunnelMsg(srv, null, [-cmd[0], err], 'control');
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}
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if (!srv._commandHandlers[cmd[1]]) {
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onError({ message: 'unknown command "'+cmd[1]+'"', code: 'E_UNKNOWN_COMMAND' });
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return;
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}
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console.log('command:', cmd[1], cmd.slice(2));
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return srv._commandHandlers[cmd[1]].apply(null, cmd.slice(2)).then(onSuccess, onError);
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}
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, onconnection: function (tun) {
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// I don't think this event can happen since this relay
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// is acting the part of the client, but just in case...
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// (in fact it should probably be explicitly disallowed)
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console.error("[SANITY FAIL] reverse connection start");
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}
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, onmessage: function (tun) {
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var cid = Packer.addrToId(tun);
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if (state.debug) { console.log("remote '" + Server.logName(state, srv) + "' has data for '" + cid + "'", tun.data.byteLength); }
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var browserConn = Server.getBrowserConn(state, srv, cid);
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if (!browserConn) {
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Server.sendTunnelMsg(srv, tun, {message: 'no matching connection', code: 'E_NO_CONN'}, 'error');
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return;
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}
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browserConn.write(tun.data);
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// tunnelRead is how many bytes we've read from the tunnel, and written to the browser.
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browserConn.tunnelRead = (browserConn.tunnelRead || 0) + tun.data.byteLength;
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// If we have more than 1MB buffered data we need to tell the other side to slow down.
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// Once we've finished sending what we have we can tell the other side to keep going.
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// If we've already sent the 'pause' message though don't send it again, because we're
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// probably just dealing with data queued before our message got to them.
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if (!browserConn.remotePaused && browserConn.bufferSize > 1024*1024) {
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Server.sendTunnelMsg(srv, tun, browserConn.tunnelRead, 'pause');
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browserConn.remotePaused = true;
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browserConn.once('drain', function () {
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Server.sendTunnelMsg(srv, tun, browserConn.tunnelRead, 'resume');
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browserConn.remotePaused = false;
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});
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}
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}
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, onpause: function (tun) {
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var cid = Packer.addrToId(tun);
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console.log('[TunnelPause]', cid);
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var browserConn = Server.getBrowserConn(state, srv, cid);
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if (browserConn) {
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browserConn.manualPause = true;
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browserConn.pause();
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} else {
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Server.sendTunnelMsg(srv, tun, {message: 'no matching connection', code: 'E_NO_CONN'}, 'error');
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}
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}
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, onresume: function (tun) {
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var cid = Packer.addrToId(tun);
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console.log('[TunnelResume]', cid);
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var browserConn = Server.getBrowserConn(state, srv, cid);
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if (browserConn) {
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browserConn.manualPause = false;
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browserConn.resume();
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} else {
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Server.sendTunnelMsg(srv, tun, {message: 'no matching connection', code: 'E_NO_CONN'}, 'error');
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}
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}
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, onend: function (tun) {
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var cid = Packer.addrToId(tun);
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console.log('[TunnelEnd]', cid);
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Server.closeBrowserConn(state, srv, cid);
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}
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, onerror: function (tun) {
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var cid = Packer.addrToId(tun);
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console.warn('[TunnelError]', cid, tun.message);
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Server.closeBrowserConn(state, srv, cid);
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}
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};
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srv._packerHandlers = packerHandlers;
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srv.unpacker = Packer.create(srv._packerHandlers);
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}
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, _initSocketHandlers: function (state, srv) {
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function refreshTimeout() {
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srv.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() - srv.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 < state.activityTimeout) {
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srv.timeoutId = setTimeout(checkTimeout, state.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 < state.activityTimeout + state.pongTimeout) {
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if (state.debug) { console.log('pinging', Server.logName(state, srv)); }
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try {
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srv.ws.ping();
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} catch (err) {
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console.warn('failed to ping home cloud', Server.logName(state, srv));
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}
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srv.timeoutId = setTimeout(checkTimeout, state.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.warn('home cloud', Server.logName(state, srv), 'connection timed out');
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srv.ws.close(1013, 'connection timeout');
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}
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}
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function forwardMessage(chunk) {
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refreshTimeout();
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if (state.debug) { console.log('[ws] device => client : demultiplexing message ', chunk.byteLength, 'bytes'); }
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//console.log(chunk.toString());
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srv.unpacker.fns.addChunk(chunk);
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}
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function hangup() {
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clearTimeout(srv.timeoutId);
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console.log('[ws] device hangup', Server.logName(state, srv), 'connection closing');
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Object.keys(srv.grants).forEach(function (jwtoken) {
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Server.removeToken(state, srv, jwtoken);
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});
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srv.ws.terminate();
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}
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srv.lastActivity = Date.now();
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srv.timeoutId = null;
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srv.timeoutId = setTimeout(checkTimeout, state.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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srv.ws.on('ping', refreshTimeout);
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srv.ws.on('pong', refreshTimeout);
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srv.ws.on('message', forwardMessage);
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srv.ws.on('close', hangup);
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srv.ws.on('error', hangup);
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}
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, init: function init(state, srv) {
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Server._initCommandHandlers(state, srv);
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Server._initPackerHandlers(state, srv);
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Server._initSocketHandlers(state, srv);
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// Status Code '1' for Status 'hello'
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Server.sendTunnelMsg(srv, null, [1, 'hello', [srv.unpacker._version], Object.keys(srv._commandHandlers)], 'control');
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}
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, sendTunnelMsg: function sendTunnelMsg(srv, addr, data, service) {
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if (data && !Buffer.isBuffer()) {
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data = Buffer.from(JSON.stringify(data));
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}
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srv.ws.send(Packer.packHeader(addr, data, service), {binary: true});
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srv.ws.send(data, {binary: true});
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}
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, logName: function logName(state, srv) {
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var result = Object.keys(srv.grants).map(function (jwtoken) {
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return srv.grants[jwtoken].currentDesc;
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}).join(';');
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return result || srv.socketId;
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}
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, onAuth: function onAuth(state, srv, rawAuth, grant) {
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console.log('\n[relay.js] onAuth');
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console.log(rawAuth);
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//console.log(grant);
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//var stringauth;
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var err;
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if (!grant || 'object' !== typeof grant) {
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console.log('[relay.js] invalid token', grant);
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err = new Error("invalid access token");
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err.code = "E_INVALID_TOKEN";
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return state.Promise.reject(err);
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}
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if ('string' !== typeof rawAuth) {
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rawAuth = JSON.stringify(rawAuth);
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}
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// TODO don't fire the onAuth event on non-authz updates
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if (!grant.jwt && !(grant.domains||[]).length && !(grant.ports||[]).length) {
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console.log("[onAuth] nothing to offer at all");
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return null;
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}
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console.log('[onAuth] check for upgrade token');
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//console.log(grant);
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if (grant.jwt) {
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if (rawAuth !== grant.jwt) {
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console.log('[onAuth] new token to send back');
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}
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// TODO only send token when new
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if (true) {
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// Access Token
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Server.sendTunnelMsg(
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srv
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, null
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, [ 3
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, 'access_token'
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, { jwt: grant.jwt }
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]
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, 'control'
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);
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// these aren't needed internally once they're sent
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grant.jwt = null;
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}
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}
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/*
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if (!Array.isArray(grant.domains) || !grant.domains.length) {
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err = new Error("invalid domains array");
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err.code = "E_INVALID_NAME";
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return state.Promise.reject(err);
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}
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*/
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if (grant.domains.some(function (name) { return typeof name !== 'string'; })) {
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console.log('bad domain names');
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err = new Error("invalid domain name(s)");
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err.code = "E_INVALID_NAME";
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return state.Promise.reject(err);
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}
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console.log('[onAuth] strolling through pleasantries');
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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 grants.
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grant.domains.forEach(function (domainname) {
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console.log('add', domainname, 'to device lists');
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srv.domainsMap[domainname] = true;
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Devices.add(state.deviceLists, domainname, srv);
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// TODO allow subs to go to individual devices
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Devices.alias(state.deviceLists, domainname, '*.' + domainname);
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});
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srv.domains = Object.keys(srv.domainsMap);
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srv.currentDesc = (grant.device && (grant.device.id || grant.device.hostname)) || srv.domains.join(',');
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grant.currentDesc = (grant.device && (grant.device.id || grant.device.hostname)) || grant.domains.join(',');
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//grant.srv = srv;
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//grant.ws = srv.ws;
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//grant.upgradeReq = srv.upgradeReq;
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grant.clients = {};
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if (!grant.ports) { grant.ports = []; }
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function openPort(serviceport) {
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function tcpListener(conn) {
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Server.onDynTcpConn(state, srv, srv.portsMap[serviceport], conn);
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}
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serviceport = parseInt(serviceport, 10) || 0;
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if (!serviceport) {
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// TODO error message about bad port
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return;
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}
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if (PortServers[serviceport]) {
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console.log('reuse', serviceport, 'for this connection');
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//grant.ports = [];
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srv.portsMap[serviceport] = PortServers[serviceport];
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srv.portsMap[serviceport].on('connection', tcpListener);
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srv.portsMap[serviceport].tcpListener = tcpListener;
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Devices.add(state.deviceLists, serviceport, srv);
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} else {
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try {
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console.log('use new', serviceport, 'for this connection');
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srv.portsMap[serviceport] = PortServers[serviceport] = require('net').createServer(tcpListener);
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srv.portsMap[serviceport].tcpListener = tcpListener;
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srv.portsMap[serviceport].listen(serviceport, function () {
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console.info('[DynTcpConn] Port', serviceport, 'now open for', grant.currentDesc);
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Devices.add(state.deviceLists, serviceport, srv);
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});
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srv.portsMap[serviceport].on('error', function (e) {
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// TODO try again with random port
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console.error("Server Error assigning a dynamic port to a new connection:", e);
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});
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} catch(e) {
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// what a wonderful problem it will be the day that this bug needs to be fixed
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// (i.e. there are enough users to run out of ports)
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console.error("Error assigning a dynamic port to a new connection:", e);
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}
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}
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}
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grant.ports.forEach(openPort);
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srv.grants[rawAuth] = grant;
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console.info("[ws] authorized", srv.socketId, "for", grant.currentDesc);
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console.log('notify of grants', grant.domains, grant.ports);
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Server.sendTunnelMsg(
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srv
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, null
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, [ 2
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, 'grant'
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, [ ['ssh+https', grant.domains[0], 443 ]
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// TODO this should be account-specific
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, ['ssh', 'ssh.' + state.config.sharedDomain, grant.ports ]
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, ['tcp', 'tcp.' + state.config.sharedDomain, grant.ports ]
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, ['https', grant.domains[0] ]
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]
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]
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, 'control'
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);
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return null;
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}
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, onDynTcpConn: function onDynTcpConn(state, srv, server, conn) {
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var serviceport = server.address().port;
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console.log('[DynTcpConn] new connection on', serviceport);
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var nextDevice = Devices.next(state.deviceLists, serviceport);
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if (!nextDevice) {
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conn.write("[Sanity Error] I've got a blank space baby, but nowhere to write your name.");
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conn.end();
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try {
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server.close();
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} catch(e) {
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console.error("[DynTcpConn] failed to close server:", e);
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}
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return;
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}
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// When using raw TCP we're already paired to the client by port
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// and we can begin connecting right away, but we'll wait just a sec
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// to reject known bad connections
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var sendConnection = setTimeout(function () {
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conn.removeListener('data', peekFirstPacket)
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console.log("[debug tcp conn] Connecting possible telnet client to device...");
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pipeWs(null, 'tcp', nextDevice, conn, serviceport);
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}, 350);
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function peekFirstPacket(firstChunk) {
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clearTimeout(sendConnection);
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if (state.debug) { console.log("[DynTcp]", serviceport, "examining firstChunk from", Packer.socketToId(conn)); }
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conn.pause();
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//conn.unshift(firstChunk);
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conn._handle.onread(firstChunk.length, firstChunk);
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var servername;
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var hostname;
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var str;
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var m;
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if (22 === firstChunk[0]) {
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servername = (sni(firstChunk)||'').toLowerCase();
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} else 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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hostname = (m && m[1].toLowerCase() || '').split(':')[0];
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}
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if (servername || hostname) {
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if (servername) {
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conn.write("TLS with sni is allowed only on standard ports. If you've registered '" + servername + "' use port 443.");
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} else {
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conn.write("HTTP with Host headers is not allowed on dynamic ports. If you've registered '" + hostname + "' use port 80.");
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}
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conn.end();
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return;
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}
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// pipeWs(servername, servicename, srv, client, serviceport)
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// remote.clients is managed as part of the piping process
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if (state.debug) { console.log("[DynTcp]", serviceport, "piping to srv (via loadbal)"); }
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pipeWs(null, 'tcp', nextDevice, conn, serviceport);
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process.nextTick(function () { conn.resume(); });
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}
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conn.once('data', peekFirstPacket);
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}
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, addToken: function addToken(state, srv, rawAuth) {
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console.log("[addToken]", rawAuth);
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if (srv.grants[rawAuth]) {
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console.log("addToken - duplicate");
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// return { message: "token sent multiple times", code: "E_TOKEN_REPEAT" };
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return state.Promise.resolve(null);
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}
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return state.authenticate({ auth: rawAuth }).then(function (validatedTokenData) {
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console.log('\n[relay.js] rawAuth');
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console.log(rawAuth);
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console.log('\n[relay.js] authnToken');
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console.log(validatedTokenData);
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// For tracking state between token exchanges
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|
// and tacking on extra attributes (i.e. for extensions)
|
|
// TODO close on delete
|
|
if (!state.srvs[validatedTokenData.id]) {
|
|
state.srvs[validatedTokenData.id] = {};
|
|
}
|
|
if (!state.srvs[validatedTokenData.id].updateAuth) {
|
|
// be sure to always pass latest srv since the connection may change
|
|
// and reuse the same token
|
|
state.srvs[validatedTokenData.id].updateAuth = function (srv, validatedTokenData) {
|
|
return Server.onAuth(state, srv, rawAuth, validatedTokenData);
|
|
};
|
|
}
|
|
state.srvs[validatedTokenData.id].updateAuth(srv, validatedTokenData);
|
|
});
|
|
}
|
|
, removeToken: function removeToken(state, srv, jwtoken) {
|
|
var grant = srv.grants[jwtoken];
|
|
if (!grant) {
|
|
return { message: 'specified token not present', code: 'E_INVALID_TOKEN'};
|
|
}
|
|
|
|
// Prevent any more browser connections for this grant being sent to this srv,
|
|
// and any existing connections from trying to send more data across the connection.
|
|
grant.domains.forEach(function (domainname) {
|
|
Devices.remove(state.deviceLists, domainname, srv);
|
|
});
|
|
grant.ports.forEach(function (portnumber) {
|
|
Devices.remove(state.deviceLists, portnumber, srv);
|
|
if (!srv.portsMap[portnumber]) { return; }
|
|
try {
|
|
srv.portsMap[portnumber].close(function () {
|
|
console.log("[DynTcpConn] closing server for ", portnumber);
|
|
delete srv.portsMap[portnumber];
|
|
delete PortServers[portnumber];
|
|
});
|
|
} catch(e) { /*ignore*/ }
|
|
});
|
|
|
|
// Close all of the existing browser connections associated with this websocket connection.
|
|
Object.keys(grant.clients).forEach(function (cid) {
|
|
Server.closeBrowserConn(state, srv, cid);
|
|
});
|
|
delete srv.grants[jwtoken];
|
|
console.log("[ws] removed token '" + grant.currentDesc + "' from", srv.socketId);
|
|
return null;
|
|
}
|
|
, getBrowserConn: function getBrowserConn(state, srv, cid) {
|
|
return srv.clients[cid];
|
|
}
|
|
, closeBrowserConn: function closeBrowserConn(state, srv, cid) {
|
|
if (!srv.clients[cid]) {
|
|
return;
|
|
}
|
|
|
|
PromiseA.resolve().then(function () {
|
|
var conn = srv.clients[cid];
|
|
conn.tunnelClosing = true;
|
|
conn.end();
|
|
|
|
// If no data is buffered for writing then we don't need to wait for it to drain.
|
|
if (!conn.bufferSize) {
|
|
return timeoutPromise(500);
|
|
}
|
|
// Otherwise we want the connection to be able to finish, but we also want to impose
|
|
// a time limit for it to drain, since it shouldn't have more than 1MB buffered.
|
|
return new PromiseA(function (resolve) {
|
|
var timeoutId = setTimeout(resolve, 60*1000);
|
|
conn.once('drain', function () {
|
|
clearTimeout(timeoutId);
|
|
setTimeout(resolve, 500);
|
|
});
|
|
});
|
|
}).then(function () {
|
|
if (srv.clients[cid]) {
|
|
console.warn(cid, 'browser connection still present after calling `end`');
|
|
srv.clients[cid].destroy();
|
|
return timeoutPromise(500);
|
|
}
|
|
}).then(function () {
|
|
if (srv.clients[cid]) {
|
|
console.error(cid, 'browser connection still present after calling `destroy`');
|
|
delete srv.clients[cid];
|
|
}
|
|
}).catch(function (err) {
|
|
console.warn('failed to close browser connection', cid, err);
|
|
});
|
|
}
|
|
, parseAuth: function parseAuth(state, srv) {
|
|
var authn = (srv.upgradeReq.headers.authorization||'').split(/\s+/);
|
|
if (authn[0] && 'basic' === authn[0].toLowerCase()) {
|
|
try {
|
|
authn = new Buffer(authn[1], 'base64').toString('ascii').split(':');
|
|
return authn[1];
|
|
} catch (err) { }
|
|
}
|
|
return url.parse(srv.upgradeReq.url, true).query.access_token;
|
|
}
|
|
};
|
|
|
|
module.exports.store = { Devices: Devices };
|
|
module.exports.create = function (state) {
|
|
state.deviceLists = {};
|
|
state.deviceCallbacks = {};
|
|
state.srvs = {};
|
|
|
|
if (!parseInt(state.activityTimeout, 10)) {
|
|
state.activityTimeout = 2 * 60 * 1000;
|
|
}
|
|
if (!parseInt(state.pongTimeout, 10)) {
|
|
state.pongTimeout = 10 * 1000;
|
|
}
|
|
state.Devices = Devices;
|
|
|
|
// TODO Use a Single TCP Handler
|
|
// Issues:
|
|
// * dynamic ports are dedicated to a device or cluster
|
|
// * servernames could come in on ports that belong to a different device
|
|
// * servernames could come in that belong to no device
|
|
// * this could lead to an attack / security vulnerability with ACME certificates
|
|
// Solutions
|
|
// * Restrict dynamic ports to a particular device
|
|
// * Restrict the use of servernames
|
|
|
|
function onWsConnection(_ws, _upgradeReq) {
|
|
var srv = {};
|
|
var initToken;
|
|
srv.ws = _ws;
|
|
srv.upgradeReq = _upgradeReq;
|
|
srv.socketId = Packer.socketToId(srv.upgradeReq.socket);
|
|
srv.grants = {};
|
|
srv.clients = {};
|
|
srv.domainsMap = {};
|
|
srv.portsMap = {};
|
|
srv.pausedConns = [];
|
|
|
|
if (state.debug) { console.log('[ws] connection', srv.socketId); }
|
|
|
|
initToken = Server.parseAuth(state, srv);
|
|
|
|
srv.ws._socket.on('drain', function () {
|
|
// the websocket library has it's own buffer apart from node's socket buffer, but that one
|
|
// is much more difficult to watch, so we watch for the lower level buffer to drain and
|
|
// then check to see if the upper level buffer is still too full to write to. Note that
|
|
// the websocket library buffer has something to do with compression, so I'm not requiring
|
|
// that to be 0 before we start up again.
|
|
if (srv.ws.bufferedAmount > 128*1024) {
|
|
return;
|
|
}
|
|
|
|
srv.pausedConns.forEach(function (conn) {
|
|
if (!conn.manualPause) {
|
|
// console.log('resuming', conn.tunnelCid, 'now that the web socket has caught up');
|
|
conn.resume();
|
|
}
|
|
});
|
|
srv.pausedConns.length = 0;
|
|
});
|
|
|
|
if (initToken) {
|
|
console.log('[wss.onConnection] token provided in http headers');
|
|
return Server.addToken(state, srv, initToken).then(function () {
|
|
Server.init(state, srv);
|
|
}).catch(function (err) {
|
|
Server.sendTunnelMsg(srv, null, [0, err], 'control');
|
|
srv.ws.close();
|
|
});
|
|
} else {
|
|
return Server.init(state, srv);
|
|
}
|
|
}
|
|
|
|
return {
|
|
tcp: require('./unwrap-tls').createTcpConnectionHandler(state)
|
|
, ws: onWsConnection
|
|
, isClientDomain: Devices.exist.bind(null, state.deviceLists)
|
|
};
|
|
};
|