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Paper/Spigot-Server-Patches/0329-Add-Velocity-IP-Forwarding-Support.patch
Zach Brown 70ce6ce831
Move version command update checking to the implementation 
This makes it easier for downstream projects (forks) to replace the
version fetching system with their own. It is as simple as implementing
an interface and overriding the default implementation of
org.bukkit.UnsafeValues#getVersionFetcher()

It also makes it easier for us to organize things like the version
history feature.

Lastly I have updated the paper implementation to check against the site
API rather than against jenkins.
2019-05-27 04:13:41 -05:00

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From 6511b39d67f36e19eb4c9ada89e8930652b35761 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/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 2d3861c18..a79cba50e 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -8,6 +8,7 @@ import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
+import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@@ -246,7 +247,7 @@ public class PaperConfig {
}
public static boolean isProxyOnlineMode() {
- return Bukkit.getOnlineMode() || (SpigotConfig.bungee && bungeeOnlineMode);
+ return Bukkit.getOnlineMode() || (SpigotConfig.bungee && bungeeOnlineMode) || (velocitySupport && velocityOnlineMode);
}
public static int packetInSpamThreshold = 300;
@@ -360,4 +361,18 @@ public class PaperConfig {
}
}
}
+
+ public static boolean velocitySupport;
+ public static boolean velocityOnlineMode;
+ public static byte[] velocitySecretKey;
+ private static void velocitySupport() {
+ velocitySupport = getBoolean("settings.velocity-support.enabled", false);
+ velocityOnlineMode = getBoolean("settings.velocity-support.online-mode", false);
+ String secret = getString("settings.velocity-support.secret", "");
+ if (velocitySupport && secret.isEmpty()) {
+ fatal("Velocity support is enabled, but no secret key was specified. A secret key is required!");
+ } else {
+ velocitySecretKey = secret.getBytes(StandardCharsets.UTF_8);
+ }
+ }
}
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 000000000..fdd8708f9
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java
@@ -0,0 +1,67 @@
+package com.destroystokyo.paper.proxy;
+
+import com.destroystokyo.paper.PaperConfig;
+import com.google.common.net.InetAddresses;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.properties.Property;
+import net.minecraft.server.MinecraftKey;
+import net.minecraft.server.PacketDataSerializer;
+
+import java.net.InetAddress;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+
+public class VelocityProxy {
+ private static final int SUPPORTED_FORWARDING_VERSION = 1;
+ public static final MinecraftKey PLAYER_INFO_CHANNEL = new MinecraftKey("velocity", "player_info");
+
+ public static boolean checkIntegrity(final PacketDataSerializer 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(PaperConfig.velocitySecretKey, "HmacSHA256"));
+ final byte[] mySignature = mac.doFinal(data);
+ if (!MessageDigest.isEqual(signature, mySignature)) {
+ return false;
+ }
+ } catch (final InvalidKeyException | NoSuchAlgorithmException e) {
+ throw new AssertionError(e);
+ }
+
+ int version = buf.readVarInt();
+ if (version != SUPPORTED_FORWARDING_VERSION) {
+ throw new IllegalStateException("Unsupported forwarding version " + version + ", wanted " + SUPPORTED_FORWARDING_VERSION);
+ }
+
+ return true;
+ }
+
+ public static InetAddress readAddress(final PacketDataSerializer buf) {
+ return InetAddresses.forString(buf.readUTF(Short.MAX_VALUE));
+ }
+
+ public static GameProfile createProfile(final PacketDataSerializer buf) {
+ final GameProfile profile = new GameProfile(buf.readUUID(), buf.readUTF(16));
+ readProperties(buf, profile);
+ return profile;
+ }
+
+ private static void readProperties(final PacketDataSerializer 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));
+ }
+ }
+}
diff --git a/src/main/java/net/minecraft/server/LoginListener.java b/src/main/java/net/minecraft/server/LoginListener.java
index d4d752ddb..5d46a975e 100644
--- a/src/main/java/net/minecraft/server/LoginListener.java
+++ b/src/main/java/net/minecraft/server/LoginListener.java
@@ -42,6 +42,7 @@ public class LoginListener implements PacketLoginInListener {
private SecretKey loginKey;
private EntityPlayer l;
public String hostname = ""; // CraftBukkit - add field
+ private int velocityLoginMessageId = -1; // Paper - Velocity support
public LoginListener(MinecraftServer minecraftserver, NetworkManager networkmanager) {
this.g = LoginListener.EnumProtocolState.HELLO;
@@ -188,6 +189,14 @@ public class LoginListener implements PacketLoginInListener {
this.g = LoginListener.EnumProtocolState.KEY;
this.networkManager.sendPacket(new PacketLoginOutEncryptionBegin("", this.server.getKeyPair().getPublic(), this.e));
} else {
+ // Paper start - Velocity support
+ if (com.destroystokyo.paper.PaperConfig.velocitySupport) {
+ this.velocityLoginMessageId = java.util.concurrent.ThreadLocalRandom.current().nextInt();
+ PacketLoginOutCustomPayload packet = new PacketLoginOutCustomPayload(this.velocityLoginMessageId, com.destroystokyo.paper.proxy.VelocityProxy.PLAYER_INFO_CHANNEL, new PacketDataSerializer(io.netty.buffer.Unpooled.EMPTY_BUFFER));
+ this.networkManager.sendPacket(packet);
+ return;
+ }
+ // Paper end
// Spigot start
// Paper start - Cache authenticator threads
authenticatorPool.execute(new Runnable() {
@@ -280,6 +289,12 @@ public class LoginListener implements PacketLoginInListener {
public class LoginHandler {
public void fireEvents() throws Exception {
+ // Paper start - Velocity support
+ if (LoginListener.this.velocityLoginMessageId == -1 && com.destroystokyo.paper.PaperConfig.velocitySupport) {
+ disconnect("This server requires you to connect with Velocity.");
+ return;
+ }
+ // Paper end
String playerName = i.getName();
java.net.InetAddress address = ((java.net.InetSocketAddress) networkManager.getSocketAddress()).getAddress();
java.util.UUID uniqueId = i.getId();
@@ -327,6 +342,35 @@ public class LoginListener implements PacketLoginInListener {
// Spigot end
public void a(PacketLoginInCustomPayload packetloginincustompayload) {
+ // Paper start - Velocity support
+ if (com.destroystokyo.paper.PaperConfig.velocitySupport && packetloginincustompayload.getId() == this.velocityLoginMessageId) {
+ PacketDataSerializer buf = packetloginincustompayload.getBuf();
+ 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;
+ }
+
+ this.networkManager.setSpoofedRemoteAddress(new java.net.InetSocketAddress(com.destroystokyo.paper.proxy.VelocityProxy.readAddress(buf), ((java.net.InetSocketAddress) this.networkManager.getSocketAddress()).getPort()));
+
+ this.setGameProfile(com.destroystokyo.paper.proxy.VelocityProxy.createProfile(buf));
+
+ // 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 " + i.getName(), ex);
+ }
+ });
+ return;
+ }
+ // Paper end
this.disconnect(new ChatMessage("multiplayer.disconnect.unexpected_query_response", new Object[0]));
}
diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index 6c5544807..38386d588 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -46,7 +46,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
private final Queue<NetworkManager.QueuedPacket> packetQueue = Queues.newConcurrentLinkedQueue(); private final Queue<NetworkManager.QueuedPacket> getPacketQueue() { return this.packetQueue; } // Paper - OBFHELPER
private final ReentrantReadWriteLock j = new ReentrantReadWriteLock();
public Channel channel;
- public SocketAddress socketAddress;
+ public SocketAddress socketAddress; public void setSpoofedRemoteAddress(SocketAddress address) { this.socketAddress = address; } // Paper - OBFHELPER
// Spigot Start
public java.util.UUID spoofedUUID;
public com.mojang.authlib.properties.Property[] spoofedProfile;
diff --git a/src/main/java/net/minecraft/server/PacketDataSerializer.java b/src/main/java/net/minecraft/server/PacketDataSerializer.java
index fa2d3ce8c..dac560c63 100644
--- a/src/main/java/net/minecraft/server/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/server/PacketDataSerializer.java
@@ -140,6 +140,7 @@ public class PacketDataSerializer extends ByteBuf {
return this.d(oenum.ordinal());
}
+ public int readVarInt() { return i(); } // Paper - OBFHELPER
public int i() {
int i = 0;
int j = 0;
@@ -180,6 +181,7 @@ public class PacketDataSerializer extends ByteBuf {
return this;
}
+ public UUID readUUID() { return k(); } // Paper - OBFHELPER
public UUID k() {
return new UUID(this.readLong(), this.readLong());
}
@@ -298,6 +300,7 @@ public class PacketDataSerializer extends ByteBuf {
}
}
+ public String readUTF(int maxLength) { return this.e(maxLength); } // Paper - OBFHELPER
public String e(int i) {
int j = this.i();
diff --git a/src/main/java/net/minecraft/server/PacketLoginInCustomPayload.java b/src/main/java/net/minecraft/server/PacketLoginInCustomPayload.java
index 4d1f44139..c1ca6f950 100644
--- a/src/main/java/net/minecraft/server/PacketLoginInCustomPayload.java
+++ b/src/main/java/net/minecraft/server/PacketLoginInCustomPayload.java
@@ -4,8 +4,8 @@ import java.io.IOException;
public class PacketLoginInCustomPayload implements Packet<PacketLoginInListener> {
- private int a;
- private PacketDataSerializer b;
+ private int a; public int getId() { return a; } // Paper - OBFHELPER
+ private PacketDataSerializer b; public PacketDataSerializer getBuf() { return b; } // Paper - OBFHELPER
public PacketLoginInCustomPayload() {}
diff --git a/src/main/java/net/minecraft/server/PacketLoginOutCustomPayload.java b/src/main/java/net/minecraft/server/PacketLoginOutCustomPayload.java
index ae74dc9e1..7eb230f1b 100644
--- a/src/main/java/net/minecraft/server/PacketLoginOutCustomPayload.java
+++ b/src/main/java/net/minecraft/server/PacketLoginOutCustomPayload.java
@@ -10,6 +10,14 @@ public class PacketLoginOutCustomPayload implements Packet<PacketLoginOutListene
public PacketLoginOutCustomPayload() {}
+ // Paper start
+ public PacketLoginOutCustomPayload(int id, MinecraftKey channel, PacketDataSerializer buf) {
+ this.a = id;
+ this.b = channel;
+ this.c = buf;
+ }
+ // Paper end
+
@Override
public void a(PacketDataSerializer packetdataserializer) throws IOException {
this.a = packetdataserializer.i();
--
2.21.0
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