//Login.
private static async Task LoginStartHandler(byte[] data, MemoryStream stream, MinecraftClientConnection connection)
{
Logger.LogMessage("Login Start");
//Grab username.
connection.connectingUsername = await ReadStringAsync(stream);
if (connection.config.OfflineMode)
{
connection.WriteString(GetKickMessage(await AuthenticationManager.GenerateToken(connection.connectingUsername, true)));
connection.Flush(0);
connection.client.Close();
return;
}
//Generate encryption data needed for connection.
connection.encryptionState = new FakeServerEncryptionState();
connection.encryptionState.GenerateKeyPair();
var keyTokenPair = connection.encryptionState.GeneratePublicKeyAndToken();
connection.randomToken = keyTokenPair.randomToken;
//Server ID (useless)
connection.WriteString("");
//Public Key.
connection.WriteVarInt(keyTokenPair.publicKey.Length);
connection.Write(keyTokenPair.publicKey);
//Token.
connection.WriteVarInt(keyTokenPair.randomToken.Length);
connection.Write(keyTokenPair.randomToken);
connection.Flush(1);
}
//Status.
private static async Task StatusRequestHandler(byte[] data, MemoryStream stream, MinecraftClientConnection connection)
{
Logger.LogMessage("Status Request");
connection.WriteString(serverStatusResponse);
connection.Flush(0);
}
private static async Task ServerAuthRequestHandler(byte[] data, MemoryStream stream, MinecraftClientConnection connection)
{
Logger.LogMessage("Server Auth Request");
//Read secret.
int secretLength = await ReadVarIntAsync(stream);
byte[] secret = new byte[secretLength];
ReadBytesAsync(stream, secret).Wait();
//Verify token.
int encryptedTokenLength = await ReadVarIntAsync(stream);
byte[] encryptedToken = new byte[encryptedTokenLength];
ReadBytesAsync(stream, encryptedToken).Wait();
//Decrypt shared key from secret.
connection.sharedKey = connection.encryptionState.Decrypt(secret);
//Decrypt the token.
byte[] token = connection.encryptionState.Decrypt(encryptedToken);
if (!token.SequenceEqual(connection.randomToken))
{
//Failed to verify token.
//Close connection.
connection.isRunning = false;
return;
}
//Get the ID of the server the client joined, from the public key.
string serverID = MinecraftShaDigest(connection.sharedKey.Concat(connection.encryptionState.publicKey).ToArray());
//Verify the player has joined the server they say they have, using Mojang's auth.
FiguraAuthServer.JoinedResponse hasJoinedResponse = await FiguraAuthServer.HasJoined(connection.connectingUsername, serverID);
if (hasJoinedResponse == null)
{
//Player hasn't actually joined this server, auth failed, close connection.
connection.isRunning = false;
return;
}
//Auth success!!!
Logger.LogMessage("Auth Complete for user " + connection.connectingUsername);
//Turn on encryption
connection.enableEncryption = true;
//Respond with JWT in kick message.
connection.WriteString(GetKickMessage(await AuthenticationManager.GenerateToken(connection.connectingUsername, false)));
connection.Flush(0);
connection.client.Close();
}
private static async Task PingRequestHandler(byte[] data, MemoryStream stream, MinecraftClientConnection connection)
{
Logger.LogMessage("Ping Request");
long l = BitConverter.ToInt64(data, 0);
connection.WriteLong(l);
connection.Flush(1);
connection.client.Close();
}