diff --git a/src/config.yml b/src/config.yml
new file mode 100644
index 0000000..06da249
--- /dev/null
+++ b/src/config.yml
@@ -0,0 +1,16 @@
+# Config for SteamWar TeamServer-Integration.
+# Every setting is locally and will not be sent to SteamWar.
+
+# Set this to 'false' to disable the TeamServer-Integration completely.
+plugin-enabled: true
+
+# Set this to 'true' to force the joining coming from SteamWar.
+force-only-steamwar-join: false
+
+# Set this to 'true' to enable the TeamServer-Integration whitelist.
+# This will not affect normal connections, only those coming from SteamWar.
+whitelist-enabled: false
+
+# You can either whitelist a UUID(recommended) or a UserName.
+# UUID's need to be in the format of 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
+whitelisted-players: []
diff --git a/src/de/steamwar/ConfigSystem.java b/src/de/steamwar/ConfigSystem.java
new file mode 100644
index 0000000..b24df69
--- /dev/null
+++ b/src/de/steamwar/ConfigSystem.java
@@ -0,0 +1,95 @@
+package de.steamwar;
+
+import lombok.experimental.UtilityClass;
+import net.md_5.bungee.config.Configuration;
+import net.md_5.bungee.config.ConfigurationProvider;
+import net.md_5.bungee.config.YamlConfiguration;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashSet;
+import java.util.Set;
+
+@UtilityClass
+public class ConfigSystem {
+
+    private File configFile;
+
+    private boolean enabled = false;
+    private long lastModified = 0;
+
+    private Configuration config;
+
+    private Set<String> whitelist = null;
+
+    static {
+        configFile = new File(SteamWarBungeeTeamserver.plugin.getDataFolder(), "config.yml");
+        if (!configFile.exists()) {
+            try {
+                configFile.createNewFile();
+                FileOutputStream fileOutputStream = new FileOutputStream(configFile);
+                InputStream inputStream = SteamWarBungeeTeamserver.plugin.getResourceAsStream("config.yml");
+                byte[] buffer = new byte[1024];
+                int length;
+                while ((length = inputStream.read(buffer)) > 0) {
+                    fileOutputStream.write(buffer, 0, length);
+                }
+                fileOutputStream.close();
+                inputStream.close();
+                enabled = true;
+            } catch (Exception e) {
+
+            }
+        }
+    }
+
+    private synchronized void load() {
+        if (!enabled) return;
+        if (lastModified >= configFile.lastModified()) return;
+        try {
+            config = ConfigurationProvider.getProvider(YamlConfiguration.class).load(configFile);
+            whitelist = null;
+            lastModified = configFile.lastModified();
+        } catch (IOException e) {
+            // Ignored
+        }
+    }
+
+    public boolean isEnabled() {
+        load();
+        if (config != null) {
+            return config.getBoolean("plugin-enabled", false) && enabled;
+        }
+        return enabled;
+    }
+
+    public boolean isOnlySteamWarJoin() {
+        load();
+        if (config != null) {
+            return config.getBoolean("force-only-steamwar-join", false);
+        }
+        return false;
+    }
+
+    public boolean isWhitelistEnabled() {
+        load();
+        if (config != null) {
+            return config.getBoolean("whitelist-enabled", false);
+        }
+        return false;
+    }
+
+    public Set<String> getWhitelist() {
+        load();
+        if (whitelist == null) {
+            if (config != null) {
+                whitelist = new HashSet<>(config.getStringList("whitelisted-players"));
+            } else {
+                whitelist = new HashSet<>();
+            }
+        }
+        return whitelist;
+    }
+}
diff --git a/src/de/steamwar/SteamWarBungeeTeamserver.java b/src/de/steamwar/SteamWarBungeeTeamserver.java
index 5582053..07480cd 100644
--- a/src/de/steamwar/SteamWarBungeeTeamserver.java
+++ b/src/de/steamwar/SteamWarBungeeTeamserver.java
@@ -5,12 +5,16 @@ import net.md_5.bungee.api.plugin.Plugin;
 
 public final class SteamWarBungeeTeamserver extends Plugin {
 
+    public static SteamWarBungeeTeamserver plugin;
+
     @Override
     public void onEnable() {
+        plugin = this;
         getProxy().getPluginManager().registerListener(this, new SteamwarConnectionListener());
     }
 
     @Override
     public void onDisable() {
+        plugin = null;
     }
 }
diff --git a/src/de/steamwar/listener/SteamwarConnectionListener.java b/src/de/steamwar/listener/SteamwarConnectionListener.java
index 1cb0ecf..ff73666 100644
--- a/src/de/steamwar/listener/SteamwarConnectionListener.java
+++ b/src/de/steamwar/listener/SteamwarConnectionListener.java
@@ -1,5 +1,6 @@
 package de.steamwar.listener;
 
+import de.steamwar.ConfigSystem;
 import io.netty.buffer.ByteBuf;
 import net.md_5.bungee.api.event.PreLoginEvent;
 import net.md_5.bungee.api.plugin.Listener;
@@ -15,6 +16,7 @@ import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.net.InetSocketAddress;
 import java.util.Arrays;
+import java.util.Set;
 import java.util.UUID;
 import java.util.function.Supplier;
 
@@ -68,12 +70,32 @@ public class SteamwarConnectionListener implements Listener {
 
     @EventHandler
     public void preLoginEvent(PreLoginEvent preLoginEvent) {
+        if (!ConfigSystem.isEnabled()) return;
+
         String address = preLoginEvent.getConnection().getSocketAddress().toString();
         if (address.startsWith("/78.31.71.136:")) {
             InitialHandler initialHandler = (InitialHandler) preLoginEvent.getConnection();
             String extraData = initialHandler.getExtraDataInHandshake();
             String[] split = extraData.split("\0");
 
+            StringBuilder uuidStringBuilder = new StringBuilder(split[2]);
+            uuidStringBuilder.insert(8, '-');
+            uuidStringBuilder.insert(13, '-');
+            uuidStringBuilder.insert(18, '-');
+            uuidStringBuilder.insert(23, '-');
+
+            if (ConfigSystem.isWhitelistEnabled()) {
+                Set<String> whitelist = ConfigSystem.getWhitelist();
+                if (!whitelist.contains(uuidStringBuilder.toString())) {
+                    preLoginEvent.setCancelled(true);
+                    return;
+                }
+                if (!whitelist.contains(preLoginEvent.getConnection().getName())) {
+                    preLoginEvent.setCancelled(true);
+                    return;
+                }
+            }
+
             try {
                 ChannelWrapper channelWrapper = ((ChannelWrapper) chField.get(initialHandler));
                 channelWrapper.setRemoteAddress(new InetSocketAddress(split[1], ((InetSocketAddress) channelWrapper.getRemoteAddress()).getPort()));
@@ -85,12 +107,9 @@ public class SteamwarConnectionListener implements Listener {
             // 0: host, 1: address, 2: uuid, (3): mojangProfile (properties, so skin data)
             preLoginEvent.getConnection().setOnlineMode(false);
 
-            StringBuilder st = new StringBuilder(split[2]);
-            st.insert(8, '-');
-            st.insert(13, '-');
-            st.insert(18, '-');
-            st.insert(23, '-');
-            initialHandler.setUniqueId(UUID.fromString(st.toString()));
+            initialHandler.setUniqueId(UUID.fromString(uuidStringBuilder.toString()));
+        } else if (ConfigSystem.isOnlySteamWarJoin()) {
+            preLoginEvent.setCancelled(true);
         }
     }
 }