531 lines
14 KiB
JavaScript
Executable file
531 lines
14 KiB
JavaScript
Executable file
#!/usr/bin/env node
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// If you can't quite trust node to find it on its own
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var localModules = '/usr/local/lib/node_modules/';
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var http = require('http');
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var url = require('url');
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var path = require('path');
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var fs = require('fs');
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//var tty = require("tty");
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var child_process = require('child_process');
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var daemon = require(path.join(localModules, "daemon"));
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var chrootDir = "/var/dgl/";
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var dropToUID = 501;
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var dropToGID = 501;
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var serveStaticRoot = "/var/www/"; // inside the chroot
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var passwdfile = "/dgldir/dgl-login";
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var sessions = {};
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var games = {
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"rogue3": {
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"name": "Rogue V3",
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"uname": "rogue3",
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"path": "/bin/rogue3"
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},
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"rogue4": {
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"name": "Rogue V4",
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"uname": "rogue4",
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"path": "/bin/rogue4"
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},
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"rogue5": {
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"name": "Rogue V5",
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"uname": "rogue5",
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"path": "/bin/rogue5"
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},
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"srogue": {
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"name": "Super-Rogue",
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"uname": "srogue",
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"path": "/bin/srogue"
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}
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};
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/* Constructor for TermSessions. Note that it opens the terminal and
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* adds itself to the sessions dict. It currently assumes the user has
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* been authenticated.
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*/
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function TermSession(game, user, files) {
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/* First make sure starting the game will work. */
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if (!(game in games)) {
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// TODO: throw an exception instead
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return null;
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}
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/* This order seems to best avoid race conditions... */
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this.alive = false;
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this.sessid = randkey();
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while (this.sessid in sessions) {
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this.sessid = randkey();
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}
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/* Grab a spot in the sessions table. */
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sessions[this.sessid] = this;
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/* TODO handle tty-opening errors */
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//var pterm = tty.open(games[game].path, ["-n", user.toString()]);
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/* TODO make argument-finding into a method */
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args = [games[game].path, "-n", user.toString()];
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this.child = child_process.spawn("/bin/ptyhelper", args);
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var ss = this;
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//this.ptmx = pterm[0];
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//this.child = pterm[1];
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this.alive = true;
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this.data = [];
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this.lock = files[0];
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fs.writeFile(this.lock, this.child.pid.toString() + '\n80\n24\n', "utf8");
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this.record = fs.createWriteStream(files[1], { mode: 0664 });
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/* END setup */
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function ttyrec_chunk(buf) {
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var ts = new Date();
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var chunk = new Buffer(buf.length + 12);
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/* TTYREC headers */
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chunk.writeUInt32LE(Math.floor(ts.getTime() / 1000), 0);
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chunk.writeUInt32LE(1000 * (ts.getTime() % 1000), 4);
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chunk.writeUInt32LE(buf.length, 8);
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buf.copy(chunk, 12);
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ss.data.push(chunk);
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ss.record.write(chunk);
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}
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this.child.stdout.on("data", ttyrec_chunk);
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this.child.stderr.on("data", ttyrec_chunk);
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this.child.on("exit", function (code, signal) {
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ss.exitcode = (code != null ? code : 255);
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ss.alive = false;
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fs.unlink(ss.lock);
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/* Wait for all the data to get collected */
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setTimeout(ss.cleanup, 1000);
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});
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this.write = function (data) {
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if (this.alive)
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this.child.stdin.write(data);
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/* Otherwise, throw some kind of exception? */
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};
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this.read = function () {
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if (this.data.length == 0)
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return null;
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var pos = 0;
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var i = 0;
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for (i = 0; i < this.data.length; i++)
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pos += this.data[i].length - 12;
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var nbuf = new Buffer(pos);
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var tptr;
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pos = 0;
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while (this.data.length > 0) {
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tptr = this.data.shift();
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tptr.copy(nbuf, pos, 12);
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pos += tptr.length - 12;
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}
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return nbuf;
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};
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this.close = function () {
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if (this.alive)
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this.child.kill('SIGHUP');
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};
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this.cleanup = function () {
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/* Call this when the child is dead. */
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if (this.alive)
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return;
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//ss.ptmx.destroy();
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ss.record.end();
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/* Give the client a chance to read any leftover data. */
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if (ss.data.length > 0)
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setTimeout(ss.remove, 8000);
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else
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ss.remove();
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};
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this.remove = function () {
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delete sessions[ss.sessid];
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console.log("Session " + this.sessid + " removed.");
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};
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}
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/* A few utility functions */
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function timestamp() {
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dd = new Date();
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sd = dd.toISOString();
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sd = sd.slice(0, sd.indexOf("."));
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return sd.replace("T", ".");
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}
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function randkey() {
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rnum = Math.floor(Math.random() * 65536 * 65536);
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hexstr = rnum.toString(16);
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while (hexstr.length < 8)
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hexstr = "0" + hexstr;
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return hexstr;
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}
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/* Returns a list of the cookies in the request, obviously. */
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function getCookies(req) {
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cookies = [];
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if ("cookie" in req.headers) {
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cookstrs = req.headers["cookie"].split("; ");
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for (var i = 0; i < cookstrs.length; i++) {
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eqsign = cookstrs[i].indexOf("=");
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if (eqsign > 0) {
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name = cookstrs[i].slice(0, eqsign).toLowerCase();
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val = cookstrs[i].slice(eqsign + 1);
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cookies[name] = val;
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}
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else if (eqsign < 0)
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cookies[cookstrs[i]] = null;
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}
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}
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return cookies;
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}
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function urlDec(encstr) {
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var decstr = "";
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var tnum;
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for (var i = 0; i < encstr.length; i++)
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{
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if (encstr.charAt(i) == "+")
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decstr += " ";
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else if (encstr.charAt(i) == "%")
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{
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tnum = Number("0x" + encstr.slice(i + 1, 2));
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if (!isNaN(tnum) && tnum >= 0)
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decstr += String.fromCharCode(tnum);
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i += 2;
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}
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else
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decstr += encstr.charAt(i);
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}
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return decstr;
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}
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/* Returns the contents of a form */
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function getFormValues(formtext) {
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var pairstrs = formtext.split("&");
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var data = {};
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for (var i = 0; i < pairstrs.length; i++)
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{
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var eqsign = pairstrs[i].indexOf("=");
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if (eqsign > 0) {
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rawname = pairstrs[i].slice(0, eqsign);
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rawval = pairstrs[i].slice(eqsign + 1);
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name = urlDec(rawname);
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val = urlDec(rawval);
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if (!(name in data))
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data[name] = [];
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data[name].push(val);
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}
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}
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return data;
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}
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function auth(username, password) {
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// Real authentication not implemented
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return true;
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}
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function login(req, res, formdata) {
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if (!("game" in formdata)) {
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sendError(res, 2, "No game specified.");
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return;
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}
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else if (!("name" in formdata)) {
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sendError(res, 2, "Username not given.");
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return;
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}
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else if (!("pw" in formdata)) {
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sendError(res, 2, "Password not given.");
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return;
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}
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var username = formdata["name"][0];
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var password = formdata["pw"][0];
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var gname = formdata["game"][0];
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if (!(gname in games)) {
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sendError(res, 2, "No such game: " + gname);
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console.log("Request for nonexistant game \"" + gname + "\"");
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return;
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}
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var progressdir = "/dgldir/inprogress-" + games[gname].uname;
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// This sets up the game once starting is approved.
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function startgame() {
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var ts = timestamp();
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var lockfile = path.join(progressdir, username + ":node:" + ts + ".ttyrec");
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var ttyrec = path.join("/dgldir/ttyrec", username, gname, ts + ".ttyrec");
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var nsession = new TermSession(gname, username, [lockfile, ttyrec]);
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if (nsession) {
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/* Technically there's a race condition for the "lock"file, but since
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* it requires the user deliberately starting two games at similar times,
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* it's not too serious. We can't get O_EXCL in Node anyway. */
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res.writeHead(200, {'Content-Type': 'text/plain'});
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res.write("l1\n" + nsession.sessid + "\n");
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res.end();
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console.log("%s playing %s (key %s, pid %d)", username, gname,
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nsession.sessid, nsession.child.pid);
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}
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else {
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sendError(res, 5, "Failed to open TTY");
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console.log("Unable to allocate TTY for " + gname);
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}
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}
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function checkit(code, signal) {
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// check the password
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if (code != 0) {
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sendError(res, 3);
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console.log("Password check failed for user " + username);
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return;
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}
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// check for an existing game
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fs.readdir(progressdir, function(err, files) {
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if (!err) {
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var fre = RegExp("^" + username + ":");
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for (var i = 0; i < files.length; i++) {
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if (files[i].match(fre)) {
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sendError(res, 4, null);
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return;
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}
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}
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}
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// If progressdir isn't readable, start a new game anyway.
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startgame();
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});
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}
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/* Look for the user in the password file */
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fs.readFile(passwdfile, "utf8", function(err, data) {
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if (err) {
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sendError(res, 3);
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console.log("Can't authenticate: " + err.toString());
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return;
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}
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var dlines = data.split('\n');
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for (var n = 0; n < dlines.length; n++) {
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var fields = dlines[n].split(':');
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if (fields[0] == username) {
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// check the password with the quickrypt utility
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checker = require('child_process').spawn("/bin/quickrypt")
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checker.on("exit", checkit);
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checker.stdin.end(password + '\n' + fields[2] + '\n', "utf8");
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return;
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}
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}
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sendError(res, 3);
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console.log("Attempted login by nonexistent user " + username);
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});
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return;
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}
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function logout(term, res) {
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if (!term.alive) {
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sendError(res, 1, null);
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return;
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}
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cterm.close();
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var resheaders = {'Content-Type': 'text/plain'};
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res.writeHead(200, resheaders);
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res.write("q1\n\n");
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res.end();
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return;
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}
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function findTermSession(formdata) {
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if ("id" in formdata) {
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var sessid = formdata["id"][0];
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if (sessid in sessions) {
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return sessions[sessid];
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}
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}
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return null;
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}
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function serveStatic(req, res, fname) {
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var nname = path.normalize(fname);
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if (nname == "" || nname == "/")
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nname = "index.html";
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if (nname.match(/\/$/))
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path.join(nname, "index.html"); /* it was a directory */
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var realname = path.join(serveStaticRoot, nname);
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var extension = path.extname(realname);
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path.exists(realname, function (exists) {
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var resheaders = {};
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if (!exists || !extension || extension == ".html")
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resheaders["Content-Type"] = "text/html";
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else if (extension == ".png")
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resheaders["Content-Type"] = "image/png";
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else if (extension == ".css")
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resheaders["Content-Type"] = "text/css";
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else if (extension == ".js")
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resheaders["Content-Type"] = "text/javascript";
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else if (extension == ".svg")
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resheaders["Content-Type"] = "image/svg+xml";
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else
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resheaders["Content-Type"] = "application/octet-stream";
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if (exists) {
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fs.readFile(realname, function (error, data) {
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if (error) {
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res.writeHead(500, {});
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res.end();
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}
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else {
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res.writeHead(200, resheaders);
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res.write(data);
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res.end();
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}
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});
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}
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else {
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res.writeHead(404, resheaders);
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res.write("<html><head><title>" + nname + "</title></head>\n<body><h1>" + nname + " Not Found</h1></body></html>\n");
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res.end();
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}
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});
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return;
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}
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function readFeed(res, term) {
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if (term) {
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var result = term.read();
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res.writeHead(200, { "Content-Type": "text/plain" });
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if (result == null)
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resultstr = "";
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else
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resultstr = result.toString("hex");
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if (result == null && !term.alive) {
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/* Child has terminated and data is flushed. */
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res.write("q1\n\n");
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}
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else
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res.write("d" + resultstr.length.toString() + "\n" + resultstr + "\n");
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res.end();
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}
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else {
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//console.log("Where's the term?");
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sendError(res, 1, null);
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}
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}
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var errorcodes = [ "Generic Error", "Not logged in", "Invalid data",
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"Login failed", "Already playing", "Game launch failed" ];
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function sendError(res, ecode, msg) {
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res.writeHead(200, { "Content-Type": "text/plain" });
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if (ecode < errorcodes.length && ecode > 0) {
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var emsg = errorcodes[ecode];
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if (msg)
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emsg += ": " + msg;
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res.write("E" + ecode + '\n' + emsg + '\n');
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}
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else
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res.write("E0\nGeneric Error\n");
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res.end();
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}
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function handler(req, res) {
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/* default headers for the response */
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var resheaders = {'Content-Type': 'text/html'};
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/* The request body will be added to this as it arrives. */
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var reqbody = "";
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var formdata;
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/* Register a listener to get the body. */
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function moredata(chunk) {
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reqbody += chunk;
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}
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req.on('data', moredata);
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/* This will send the response once the whole request is here. */
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function respond() {
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formdata = getFormValues(reqbody);
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var target = url.parse(req.url).pathname;
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var cterm = findTermSession(formdata);
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/* First figure out if the client is POSTing to a command interface. */
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if (req.method == 'POST') {
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if (target == '/feed') {
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if (!cterm) {
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sendError(res, 1, null);
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return;
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}
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if ("quit" in formdata) {
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/* The client wants to terminate the process. */
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logout(cterm, res);
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}
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else if (formdata["keys"]) {
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/* process the keys */
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hexstr = formdata["keys"][0].replace(/[^0-9a-f]/gi, "");
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if (hexstr.length % 2 != 0) {
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sendError(res, 2, "incomplete byte");
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return;
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}
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keybuf = new Buffer(hexstr, "hex");
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cterm.write(keybuf);
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}
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readFeed(res, cterm);
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}
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else if (target == "/login") {
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login(req, res, formdata);
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}
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else {
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res.writeHead(405, resheaders);
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res.end();
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}
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}
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else if (req.method == 'GET' || req.method == 'HEAD') {
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if (target == '/feed') {
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if (!cterm) {
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sendError(res, 1, null);
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return;
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}
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readFeed(res, cterm);
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}
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/* Default page, create a new term */
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/* FIXME New term not created anymore, is a special case still needed? */
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else if (target == '/') {
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serveStatic(req, res, "/");
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}
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else /* Go look for it in the filesystem */
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serveStatic(req, res, target);
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}
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else { /* Some other method */
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res.writeHead(501, resheaders);
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res.write("<html><head><title>501</title></head>\n<body><h1>501 Not Implemented</h1></body></html>\n");
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res.end();
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}
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return;
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}
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req.on('end', respond);
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}
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process.on("exit", function () {
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for (var sessid in sessions) {
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if (sessions[sessid].alive)
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sessions[sessid].child.kill('SIGHUP');
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}
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console.log("Quitting...");
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return;
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});
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|
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/* Initialization STARTS HERE */
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|
process.env["TERM"] = "xterm-256color";
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|
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if (process.getuid() != 0) {
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console.log("Not running as root, cannot chroot.");
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process.exit(1);
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}
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try {
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process.chdir(chrootDir);
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}
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catch (err) {
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console.log("Cannot enter " + chrootDir + " : " + err);
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process.exit(1);
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}
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try {
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daemon.chroot(chrootDir);
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}
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catch (err) {
|
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console.log("chroot to " + chrootDir + " failed: " + err);
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process.exit(1);
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}
|
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try {
|
|
// drop gid first, that requires UID=0
|
|
process.setgid(dropToGID);
|
|
process.setuid(dropToUID);
|
|
}
|
|
catch (err) {
|
|
console.log("Could not drop permissions: " + err);
|
|
process.exit(1);
|
|
}
|
|
|
|
http.createServer(handler).listen(8080, "127.0.0.1");
|
|
console.log('webttyd running at http://127.0.0.1:8080/');
|