Paper/patches/server/0856-Add-Velocity-IP-Forwarding-Support.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Mon, 8 Oct 2018 14:36:14 -0400
Subject: [PATCH] Add Velocity IP Forwarding Support

While Velocity supports BungeeCord-style IP forwarding, it is not secure. Users
have a lot of problems setting up firewalls or setting up plugins like IPWhitelist.
Further, the BungeeCord IP forwarding protocol still retains essentially its original
form, when there is brand new support for custom login plugin messages in 1.13.

Velocity's modern IP forwarding uses an HMAC-SHA256 code to ensure authenticity
of messages, is packed into a binary format that is smaller than BungeeCord's
forwarding, and is integrated into the Minecraft login process by using the 1.13
login plugin message packet.

diff --git a/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java b/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java
new file mode 100644
index 0000000000000000000000000000000000000000..c4934979b1ed85bfc4f8d9e6f8848b2beaad95c3
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java
@@ -0,0 +1,75 @@
+package com.destroystokyo.paper.proxy;
+
+import io.papermc.paper.configuration.GlobalConfiguration;
+import com.google.common.net.InetAddresses;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.properties.Property;
+import java.net.InetAddress;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.UUID;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.player.ProfilePublicKey;
+
+public class VelocityProxy {
+    private static final int SUPPORTED_FORWARDING_VERSION = 1;
+    public static final int MODERN_FORWARDING_WITH_KEY = 2;
+    public static final int MODERN_FORWARDING_WITH_KEY_V2 = 3;
+    public static final int MODERN_LAZY_SESSION = 4;
+    public static final byte MAX_SUPPORTED_FORWARDING_VERSION = MODERN_LAZY_SESSION;
+    public static final ResourceLocation PLAYER_INFO_CHANNEL = new ResourceLocation("velocity", "player_info");
+
+    public static boolean checkIntegrity(final FriendlyByteBuf buf) {
+        final byte[] signature = new byte[32];
+        buf.readBytes(signature);
+
+        final byte[] data = new byte[buf.readableBytes()];
+        buf.getBytes(buf.readerIndex(), data);
+
+        try {
+            final Mac mac = Mac.getInstance("HmacSHA256");
+            mac.init(new SecretKeySpec(GlobalConfiguration.get().proxies.velocity.secret.getBytes(java.nio.charset.StandardCharsets.UTF_8), "HmacSHA256"));
+            final byte[] mySignature = mac.doFinal(data);
+            if (!MessageDigest.isEqual(signature, mySignature)) {
+                return false;
+            }
+        } catch (final InvalidKeyException | NoSuchAlgorithmException e) {
+            throw new AssertionError(e);
+        }
+
+        return true;
+    }
+
+    public static InetAddress readAddress(final FriendlyByteBuf buf) {
+        return InetAddresses.forString(buf.readUtf(Short.MAX_VALUE));
+    }
+
+    public static GameProfile createProfile(final FriendlyByteBuf buf) {
+        final GameProfile profile = new GameProfile(buf.readUUID(), buf.readUtf(16));
+        readProperties(buf, profile);
+        return profile;
+    }
+
+    private static void readProperties(final FriendlyByteBuf buf, final GameProfile profile) {
+        final int properties = buf.readVarInt();
+        for (int i1 = 0; i1 < properties; i1++) {
+            final String name = buf.readUtf(Short.MAX_VALUE);
+            final String value = buf.readUtf(Short.MAX_VALUE);
+            final String signature = buf.readBoolean() ? buf.readUtf(Short.MAX_VALUE) : null;
+            profile.getProperties().put(name, new Property(name, value, signature));
+        }
+    }
+
+    public static ProfilePublicKey.Data readForwardedKey(FriendlyByteBuf buf) {
+        return new ProfilePublicKey.Data(buf);
+    }
+
+    public static UUID readSignerUuidOrElse(FriendlyByteBuf buf, UUID orElse) {
+        return buf.readBoolean() ? buf.readUUID() : orElse;
+    }
+}
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index 8115cf64a30b6438721769df6045e1b77acf88ce..9f422cbeaa52b3e6a0a27af4f8ad4ddb7808483f 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -274,13 +274,20 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
         server.enablePlugins(org.bukkit.plugin.PluginLoadOrder.STARTUP);
         // CraftBukkit end
 
+        // Paper start
+        boolean usingProxy = org.spigotmc.SpigotConfig.bungee || io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled;
+        String proxyFlavor = (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) ? "Velocity" : "BungeeCord";
+        String proxyLink = (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) ? "https://docs.papermc.io/velocity/security" : "http://www.spigotmc.org/wiki/firewall-guide/";
+        // Paper end
         if (!this.usesAuthentication()) {
             DedicatedServer.LOGGER.warn("**** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!");
             DedicatedServer.LOGGER.warn("The server will make no attempt to authenticate usernames. Beware.");
             // Spigot start
-            if (org.spigotmc.SpigotConfig.bungee) {
-                DedicatedServer.LOGGER.warn("Whilst this makes it possible to use BungeeCord, unless access to your server is properly restricted, it also opens up the ability for hackers to connect with any username they choose.");
-                DedicatedServer.LOGGER.warn("Please see http://www.spigotmc.org/wiki/firewall-guide/ for further information.");
+            // Paper start
+            if (usingProxy) {
+                DedicatedServer.LOGGER.warn("Whilst this makes it possible to use " + proxyFlavor + ", unless access to your server is properly restricted, it also opens up the ability for hackers to connect with any username they choose.");
+                DedicatedServer.LOGGER.warn("Please see " + proxyLink + " for further information.");
+            // Paper end
             } else {
                 DedicatedServer.LOGGER.warn("While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.");
             }
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 3fcd7bfdb8945b276c94a263e9da6b85ce470366..3431b1132e55c53cda7cf47f021f23068b63322d 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -61,6 +61,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     @Nullable
     private ServerPlayer delayedAcceptPlayer;
     public boolean iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation = false; // Paper - username validation overriding
+    private int velocityLoginMessageId = -1; // Paper - Velocity support
 
     public ServerLoginPacketListenerImpl(MinecraftServer server, Connection connection) {
         this.state = ServerLoginPacketListenerImpl.State.HELLO;
@@ -256,6 +257,16 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
                 this.state = ServerLoginPacketListenerImpl.State.KEY;
                 this.connection.send(new ClientboundHelloPacket("", this.server.getKeyPair().getPublic().getEncoded(), this.challenge));
             } else {
+                // Paper start - Velocity support
+                if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) {
+                    this.velocityLoginMessageId = java.util.concurrent.ThreadLocalRandom.current().nextInt();
+                    net.minecraft.network.FriendlyByteBuf buf = new net.minecraft.network.FriendlyByteBuf(io.netty.buffer.Unpooled.buffer());
+                    buf.writeByte(com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION);
+                    net.minecraft.network.protocol.login.ClientboundCustomQueryPacket packet1 = new net.minecraft.network.protocol.login.ClientboundCustomQueryPacket(this.velocityLoginMessageId, com.destroystokyo.paper.proxy.VelocityProxy.PLAYER_INFO_CHANNEL, buf);
+                    this.connection.send(packet1);
+                    return;
+                }
+                // Paper end
                 // Spigot start
             // Paper start - Cache authenticator threads
             authenticatorPool.execute(new Runnable() {
@@ -363,6 +374,12 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     public class LoginHandler {
 
         public void fireEvents() throws Exception {
+                        // Paper start - Velocity support
+                        if (ServerLoginPacketListenerImpl.this.velocityLoginMessageId == -1 && io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) {
+                            disconnect("This server requires you to connect with Velocity.");
+                            return;
+                        }
+                        // Paper end
                         String playerName = ServerLoginPacketListenerImpl.this.gameProfile.getName();
                         java.net.InetAddress address = ((java.net.InetSocketAddress) ServerLoginPacketListenerImpl.this.connection.getRemoteAddress()).getAddress();
                         java.net.InetAddress rawAddress = ((java.net.InetSocketAddress) connection.channel.remoteAddress()).getAddress(); // Paper
@@ -411,6 +428,47 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     // Spigot end
 
     public void handleCustomQueryPacket(ServerboundCustomQueryPacket packet) {
+        // Paper start - Velocity support
+        if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled && packet.getTransactionId() == this.velocityLoginMessageId) {
+            net.minecraft.network.FriendlyByteBuf buf = packet.getData();
+            if (buf == null) {
+                this.disconnect("This server requires you to connect with Velocity.");
+                return;
+            }
+
+            if (!com.destroystokyo.paper.proxy.VelocityProxy.checkIntegrity(buf)) {
+                this.disconnect("Unable to verify player details");
+                return;
+            }
+
+            int version = buf.readVarInt();
+            if (version > com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION) {
+                throw new IllegalStateException("Unsupported forwarding version " + version + ", wanted upto " + com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION);
+            }
+
+            java.net.SocketAddress listening = this.connection.getRemoteAddress();
+            int port = 0;
+            if (listening instanceof java.net.InetSocketAddress) {
+                port = ((java.net.InetSocketAddress) listening).getPort();
+            }
+            this.connection.address = new java.net.InetSocketAddress(com.destroystokyo.paper.proxy.VelocityProxy.readAddress(buf), port);
+
+            this.gameProfile = com.destroystokyo.paper.proxy.VelocityProxy.createProfile(buf);
+
+            //TODO Update handling for lazy sessions, might not even have to do anything?
+
+            // Proceed with login
+            authenticatorPool.execute(() -> {
+                try {
+                    new LoginHandler().fireEvents();
+                } catch (Exception ex) {
+                    disconnect("Failed to verify username!");
+                    server.server.getLogger().log(java.util.logging.Level.WARNING, "Exception verifying " + gameProfile.getName(), ex);
+                }
+            });
+            return;
+        }
+        // Paper end
         this.disconnect(Component.translatable("multiplayer.disconnect.unexpected_query_response"));
     }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index f5f69968aa80c58b5325d4b6a3d03439149b7375..cd4c2e4c0d9d9003273fe04bbe9a61b3024547dd 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -801,7 +801,7 @@ public final class CraftServer implements Server {
     @Override
     public long getConnectionThrottle() {
         // Spigot Start - Automatically set connection throttle for bungee configurations
-        if (org.spigotmc.SpigotConfig.bungee) {
+        if (org.spigotmc.SpigotConfig.bungee || io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) { // Paper - Velocity support
             return -1;
         } else {
             return this.configuration.getInt("settings.connection-throttle");