successfully log in to minecraft server

next step is to add more supported packets

README.md

@@ -5,3 +5,29 @@ level library to write bots.
 
 Hopefully eventually we can merge 
 [mineflayer](https://github.com/superjoe30/mineflayer) with this project.
+
+## Try it out so far
+
+```
+$ MC_EMAIL=you@example.com MC_PASSWORD=your_pass node test.js
+logging in to minecraft.net
+logged in as user_name
+connect
+enc key request
+write enc key response
+confirmation enc key response
+writing 205 packet with encryption
+login request { id: 1,
+  entityId: 839,
+  levelType: 'default',
+  gameMode: 0,
+  dimension: 0,
+  difficulty: 1,
+  _notUsed1: 0,
+  maxPlayers: 20 }
+
+assert.js:102
+  throw new assert.AssertionError({
+        ^
+AssertionError: Unrecognized packetId: 6
+```

lib/parser.js

@@ -46,6 +46,10 @@ Parser.prototype.connect = function(port, host) {
   });
 };
 
+Parser.prototype.end = function() {
+  this.client.end();
+};
+
 Parser.prototype.writePacket = function(packetId, params) {
   var buffer = createPacketBuffer(packetId, params);
   var out = this.encryptionEnabled ? new Buffer(this.cipher.update(buffer), 'binary') : buffer;
@@ -64,6 +68,8 @@ var readers = {
   'string': readString,
   'byteArray': readByteArray,
   'short': readShort,
+  'int': readInt,
+  'byte': readByte,
 };
 
 function readString (buffer, offset) {
@@ -74,7 +80,7 @@ function readString (buffer, offset) {
   var strLen = results.value;
   var strEnd = strBegin + strLen * 2;
   if (strEnd > buffer.length) return null;
-  var str = fromUcs2.convert(buffer.slice(strBegin, strEnd)).toString();
+  var str = fromUcs2.convert(buffer.slice(strBegin, strEnd)).toString('utf8');
 
   return {
     value: str,
@@ -107,6 +113,24 @@ function readShort(buffer, offset) {
   };
 }
 
+function readInt(buffer, offset) {
+  if (offset + 4 > buffer.length) return null;
+  var value = buffer.readInt32BE(offset);
+  return {
+    value: value,
+    size: 4,
+  };
+}
+
+function readByte(buffer, offset) {
+  if (offset + 1 > buffer.length) return null;
+  var value = buffer.readInt8(offset);
+  return {
+    value: value,
+    size: 1,
+  };
+}
+
 function StringWriter(value) {
   this.value = value;
   this.encoded = toUcs2.convert(value);

packets.json

@@ -35,7 +35,7 @@
       "type": "byte"
     },
     {
-      "name": "userName",
+      "name": "username",
       "type": "string"
     },
     {

test.js

@@ -2,15 +2,23 @@ var Parser = require('./lib/parser')
   , ursa = require('ursa')
   , crypto = require('crypto')
   , assert = require('assert')
+  , superagent = require('superagent')
+
+var input = {
+  email: process.env.MC_EMAIL,
+  password: process.env.MC_PASSWORD,
+  serverHost: 'localhost',
+  serverPort: 25565,
+};
 
 var parser = new Parser();
 parser.on('connect', function() {
   console.info("connect");
   parser.writePacket(Parser.HANDSHAKE, {
     protocolVersion: 51,
-    userName: 'superjoe30',
-    serverHost: 'localhost',
-    serverPort: 25565,
+    username: loginSession.username,
+    serverHost: input.serverHost,
+    serverPort: input.serverPort,
   });
 });
 parser.on('packet', function(packet) {
@@ -27,7 +35,44 @@ parser.on('error', function(err) {
 parser.on('end', function() {
   console.info("disconnect");
 });
-parser.connect(25565, 'localhost');
+
+var loginSession = null;
+getLoginSession(function() {
+  parser.connect(input.serverPort, input.serverHost);
+});
+
+function getLoginSession(cb) {
+  console.log("logging in to minecraft.net");
+  var req = superagent.post("https://login.minecraft.net");
+  req.type('form');
+  req.send({
+    user: input.email,
+    password: input.password,
+    version: 13,
+  });
+  req.end(function(err, resp) {
+    if (err) {
+      cb(err);
+    } else if (! resp.ok) {
+      cb(new Error("login.minecraft.net status " + resp.status + ": " + resp.text));
+    } else {
+      var values = resp.text.split(':');
+      var session = {
+        currentGameVersion: values[0],
+        username: values[2],
+        id: values[3],
+        uid: values[4],
+      };
+      if (session.id) {
+        loginSession = session;
+        console.info("logged in as", session.username);
+        cb();
+      } else {
+        cb(new Error("login.minecraft.net says " + session.currentGameVersion));
+      }
+    }
+  });
+}
 
 var packetHandlers = {
   0xFC: onEncryptionKeyResponse,
@@ -46,20 +91,46 @@ function onLoginRequest(packet) {
 
 function onEncryptionKeyRequest(packet) {
   console.log("enc key request");
+  var hash = crypto.createHash('sha1');
+  hash.update(packet.serverId);
   crypto.randomBytes(16, function (err, sharedSecret) {
     assert.ifError(err);
-    var pubKey = mcPubKeyToURsa(packet.publicKey);
-    var encryptedSharedSecret = pubKey.encrypt(sharedSecret, 'binary', 'base64', ursa.RSA_PKCS1_PADDING);
-    var encryptedSharedSecretBuffer = new Buffer(encryptedSharedSecret, 'base64');
-    var encryptedVerifyToken = pubKey.encrypt(packet.verifyToken, 'binary', 'base64', ursa.RSA_PKCS1_PADDING);
-    var encryptedVerifyTokenBuffer = new Buffer(encryptedVerifyToken, 'base64');
-    parser.cipher = crypto.createCipheriv('aes-128-cfb8', sharedSecret, sharedSecret);
-    parser.decipher = crypto.createDecipheriv('aes-128-cfb8', sharedSecret, sharedSecret);
-    console.log("write enc key response");
-    parser.writePacket(Parser.ENCRYPTION_KEY_RESPONSE, {
-      sharedSecret: encryptedSharedSecretBuffer,
-      verifyToken: encryptedVerifyTokenBuffer,
+    hash.update(sharedSecret);
+    hash.update(packet.publicKey);
+    var digest = mcHexDigest(hash);
+    var request = superagent.get("http://session.minecraft.net/game/joinserver.jsp");
+
+    request.query({
+      user: loginSession.username,
+      sessionId: loginSession.id,
+      serverId: digest,
     });
+    request.end(function(err, resp) {
+      if (err) {
+        console.error("session.minecraft.net not available");
+        // TODO emit error
+      } else if (! resp.ok) {
+        console.error("session.minecraft.net returned error:", resp.status, resp.text);
+        // TODO emit error
+      } else {
+        sendEncryptionKeyResponse();
+      }
+    });
+
+    function sendEncryptionKeyResponse() {
+      var pubKey = mcPubKeyToURsa(packet.publicKey);
+      var encryptedSharedSecret = pubKey.encrypt(sharedSecret, 'binary', 'base64', ursa.RSA_PKCS1_PADDING);
+      var encryptedSharedSecretBuffer = new Buffer(encryptedSharedSecret, 'base64');
+      var encryptedVerifyToken = pubKey.encrypt(packet.verifyToken, 'binary', 'base64', ursa.RSA_PKCS1_PADDING);
+      var encryptedVerifyTokenBuffer = new Buffer(encryptedVerifyToken, 'base64');
+      parser.cipher = crypto.createCipheriv('aes-128-cfb8', sharedSecret, sharedSecret);
+      parser.decipher = crypto.createDecipheriv('aes-128-cfb8', sharedSecret, sharedSecret);
+      console.log("write enc key response");
+      parser.writePacket(Parser.ENCRYPTION_KEY_RESPONSE, {
+        sharedSecret: encryptedSharedSecretBuffer,
+        verifyToken: encryptedVerifyTokenBuffer,
+      });
+    }
   });
 }
 
@@ -82,3 +153,31 @@ function mcPubKeyToURsa(mcPubKeyBuffer) {
   pem += "-----END PUBLIC KEY-----\n";
   return ursa.createPublicKey(pem, 'utf8');
 }
+
+function mcHexDigest(hash) {
+  var buffer = new Buffer(hash.digest(), 'binary');
+  // check for negative hashes
+  var negative = buffer.readInt8(0) < 0;
+  if (negative) performTwosCompliment(buffer);
+  var digest = buffer.toString('hex');
+  // trim leading zeroes
+  digest = digest.replace(/^0+/g, '');
+  if (negative) digest = '-' + digest;
+  return digest;
+
+  function performTwosCompliment(buffer) {
+    var carry = true;
+    var i, newByte, value;
+    for (i = buffer.length - 1; i >= 0; --i) {
+      value = buffer.readUInt8(i);
+      newByte = ~value & 0xff;
+      if (carry) {
+        carry = newByte === 0xff;
+        buffer.writeUInt8(newByte + 1, i);
+      } else {
+        buffer.writeUInt8(newByte, i);
+      }
+    }
+  }
+}
+