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-rw-r--r--server/src/core/rateLimiter.js104
-rw-r--r--server/src/core/server.js197
2 files changed, 301 insertions, 0 deletions
diff --git a/server/src/core/rateLimiter.js b/server/src/core/rateLimiter.js
new file mode 100644
index 0000000..0f45239
--- /dev/null
+++ b/server/src/core/rateLimiter.js
@@ -0,0 +1,104 @@
+/**
+ * Tracks frequency of occurances based on `id` (remote address), then allows or
+ * denies command execution based on comparison with `threshold`
+ *
+ * Version: v2.0.0
+ * Developer: Marzavec ( https://github.com/marzavec )
+ * License: WTFPL ( http://www.wtfpl.net/txt/copying/ )
+ *
+ */
+
+'use strict';
+
+class Police {
+ /**
+ * Create a ratelimiter instance.
+ */
+ constructor () {
+ this._records = {};
+ this._halflife = 30000; // ms
+ this._threshold = 25;
+ }
+
+ /**
+ * Finds current score by `id`
+ *
+ * @param {String} id target id / address
+ * @public
+ *
+ * @memberof Police
+ */
+ search (id) {
+ let record = this._records[id];
+
+ if (!record) {
+ record = this._records[id] = {
+ time: Date.now(),
+ score: 0
+ }
+ }
+
+ return record;
+ }
+
+ /**
+ * Adjusts the current ratelimit score by `deltaScore`
+ *
+ * @param {String} id target id / address
+ * @param {Number} deltaScore amount to adjust current score by
+ * @public
+ *
+ * @memberof Police
+ */
+ frisk (id, deltaScore) {
+ let record = this.search(id);
+
+ if (record.arrested) {
+ return true;
+ }
+
+ record.score *= Math.pow(2, -(Date.now() - record.time ) / this._halflife);
+ record.score += deltaScore;
+ record.time = Date.now();
+
+ if (record.score >= this._threshold) {
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Statically set server to no longer accept traffic from `id`
+ *
+ * @param {String} id target id / address
+ * @public
+ *
+ * @memberof Police
+ */
+ arrest (id) {
+ var record = this.search(id);
+
+ if (record) {
+ record.arrested = true;
+ }
+ }
+
+ /**
+ * Remove statically assigned limit from `id`
+ *
+ * @param {String} id target id / address
+ * @public
+ *
+ * @memberof Police
+ */
+ pardon (id) {
+ var record = this.search(id);
+
+ if (record) {
+ record.arrested = false;
+ }
+ }
+}
+
+module.exports = Police;
diff --git a/server/src/core/server.js b/server/src/core/server.js
new file mode 100644
index 0000000..c16aec8
--- /dev/null
+++ b/server/src/core/server.js
@@ -0,0 +1,197 @@
+/**
+ * Main websocket server handling communications and connection events
+ *
+ * Version: v2.0.0
+ * Developer: Marzavec ( https://github.com/marzavec )
+ * License: WTFPL ( http://www.wtfpl.net/txt/copying/ )
+ *
+ */
+
+'use strict';
+
+const wsServer = require('ws').Server;
+const Police = require('./rateLimiter');
+
+class server extends wsServer {
+ /**
+ * Create a HackChat server instance.
+ *
+ * @param {Object} core Reference to the core server object
+ */
+ constructor (core) {
+ super({ port: core.config.websocketPort });
+
+ this._core = core;
+ this._police = new Police();
+ this._cmdBlacklist = {};
+
+ this.on('error', (err) => {
+ this.handleError('server', err);
+ });
+
+ this.on('connection', (socket, request) => {
+ this.newConnection(socket, request);
+ });
+ }
+
+ /**
+ * Bind listeners for the new socket created on connection to this class
+ *
+ * @param {Object} socket New socket object
+ * @param {Object} request Initial headers of the new connection
+ */
+ newConnection (socket, request) {
+ socket.remoteAddress = request.headers['x-forwarded-for'] || request.connection.remoteAddress;
+
+ socket.on('message', ((data) => {
+ this.handleData(socket, data);
+ }).bind(this));
+
+ socket.on('close', (() => {
+ this.handleClose(socket);
+ }).bind(this));
+
+ socket.on('error', ((err) => {
+ this.handleError(socket, err);
+ }).bind(this));
+ }
+
+ /**
+ * Handle incoming messages from clients, parse and check command, then hand-off
+ *
+ * @param {Object} socket Calling socket object
+ * @param {String} data Message sent from client
+ */
+ handleData (socket, data) {
+ // TODO: Rate limit here
+ // Don't penalize yet, but check whether IP is rate-limited
+ if (this._police.frisk(socket.remoteAddress, 0)) {
+ this.reply({ cmd: 'warn', text: "Your IP is being rate-limited or blocked." }, socket);
+
+ return;
+ }
+
+ // Penalize here, but don't do anything about it
+ this._police.frisk(socket.remoteAddress, 1);
+
+ // ignore ridiculously large packets
+ if (data.length > 65536) {
+ return;
+ }
+
+ var args = null;
+ try {
+ args = JSON.parse(data);
+ } catch (e) {
+ // Client sent malformed json, gtfo
+ socket.close();
+ }
+
+ if (args === null)
+ return;
+
+ if (typeof args.cmd === 'undefined' || args.cmd == 'ping')
+ return;
+
+ var cmd = args.cmd;
+
+ if (typeof socket.channel === 'undefined' && cmd !== 'join')
+ return;
+
+ if (typeof this._cmdBlacklist[cmd] === 'function') {
+ return;
+ }
+
+ this._core.commands.handleCommand(this, socket, args);
+ }
+
+ /**
+ * Handle socket close from clients
+ *
+ * @param {Object} socket Closing socket object
+ */
+ handleClose (socket) {
+ try {
+ if (socket.channel) {
+ this.broadcast({
+ cmd: 'onlineRemove',
+ nick: socket.nick
+ }, { channel: socket.channel });
+ }
+ } catch (e) {
+ // TODO: Should this be added to the error log?
+ }
+ }
+
+ /**
+ * "Handle" server or socket errors
+ *
+ * @param {Object||String} socket Calling socket object, or 'server'
+ * @param {String} err The sad stuff
+ */
+ handleError (socket, err) {
+ // Meh, yolo
+ // I mean;
+ // TODO: Should this be added to the error log?
+ }
+
+ /**
+ * Send data payload to specific socket/client
+ *
+ * @param {Object} data Object to convert to json for transmission
+ * @param {Object} socket The target client
+ */
+ send (data, socket) {
+ // Add timestamp to command
+ data.time = Date.now();
+
+ try {
+ if (socket.readyState == 1) { // Who says statically checking port status is bad practice? Everyone? Damnit. #TODO
+ socket.send(JSON.stringify(data));
+ }
+ } catch (e) { }
+ }
+
+ /**
+ * Overload function for `this.send()`
+ *
+ * @param {Object} data Object to convert to json for transmission
+ * @param {Object} socket The target client
+ */
+ reply (data, socket) {
+ this.send(data, socket);
+ }
+
+ /**
+ * Finds sockets/clients that meet the filter requirements, then passes the data to them
+ *
+ * @param {Object} data Object to convert to json for transmission
+ * @param {Object} filter The socket must of equal or greater attribs matching `filter`
+ * = {} // matches all
+ * = { channel: 'programming' } // matches any socket where (`socket.channel` === 'programming')
+ * = { channel: 'programming', nick: 'Marzavec' } // matches any socket where (`socket.channel` === 'programming' && `socket.nick` === 'Marzavec')
+ */
+ broadcast (data, filter) {
+ let filterAttribs = Object.keys(filter);
+ let reqCount = filterAttribs.length;
+ let curMatch;
+ let sent = false;
+ for ( let socket of this.clients ) {
+ curMatch = 0;
+
+ for( let i = 0; i < reqCount; i++ ) {
+ if (typeof socket[filterAttribs[i]] !== 'undefined' && socket[filterAttribs[i]] === filter[filterAttribs[i]])
+ curMatch++;
+ }
+
+ if (curMatch === reqCount) {
+ this.send(data, socket);
+ sent = true;
+ }
+ }
+
+ return sent;
+ }
+}
+
+module.exports = server;