mirror of
https://github.com/PaperMC/Paper.git
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228 lines
13 KiB
Diff
228 lines
13 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Mon, 8 Oct 2018 14:36:14 -0400
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Subject: [PATCH] Add Velocity IP Forwarding Support
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While Velocity supports BungeeCord-style IP forwarding, it is not secure. Users
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have a lot of problems setting up firewalls or setting up plugins like IPWhitelist.
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Further, the BungeeCord IP forwarding protocol still retains essentially its original
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form, when there is brand new support for custom login plugin messages in 1.13.
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Velocity's modern IP forwarding uses an HMAC-SHA256 code to ensure authenticity
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of messages, is packed into a binary format that is smaller than BungeeCord's
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forwarding, and is integrated into the Minecraft login process by using the 1.13
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login plugin message packet.
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diff --git a/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java b/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..c4934979b1ed85bfc4f8d9e6f8848b2beaad95c3
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/proxy/VelocityProxy.java
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@@ -0,0 +1,75 @@
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+package com.destroystokyo.paper.proxy;
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+
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+import io.papermc.paper.configuration.GlobalConfiguration;
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+import com.google.common.net.InetAddresses;
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+import com.mojang.authlib.GameProfile;
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+import com.mojang.authlib.properties.Property;
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+import java.net.InetAddress;
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+import java.security.InvalidKeyException;
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+import java.security.MessageDigest;
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+import java.security.NoSuchAlgorithmException;
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+import java.util.UUID;
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+
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+import javax.crypto.Mac;
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+import javax.crypto.spec.SecretKeySpec;
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+import net.minecraft.network.FriendlyByteBuf;
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+import net.minecraft.resources.ResourceLocation;
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+import net.minecraft.world.entity.player.ProfilePublicKey;
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+
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+public class VelocityProxy {
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+ private static final int SUPPORTED_FORWARDING_VERSION = 1;
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+ public static final int MODERN_FORWARDING_WITH_KEY = 2;
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+ public static final int MODERN_FORWARDING_WITH_KEY_V2 = 3;
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+ public static final int MODERN_LAZY_SESSION = 4;
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+ public static final byte MAX_SUPPORTED_FORWARDING_VERSION = MODERN_LAZY_SESSION;
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+ public static final ResourceLocation PLAYER_INFO_CHANNEL = new ResourceLocation("velocity", "player_info");
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+
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+ public static boolean checkIntegrity(final FriendlyByteBuf buf) {
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+ final byte[] signature = new byte[32];
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+ buf.readBytes(signature);
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+
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+ final byte[] data = new byte[buf.readableBytes()];
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+ buf.getBytes(buf.readerIndex(), data);
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+
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+ try {
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+ final Mac mac = Mac.getInstance("HmacSHA256");
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+ mac.init(new SecretKeySpec(GlobalConfiguration.get().proxies.velocity.secret.getBytes(java.nio.charset.StandardCharsets.UTF_8), "HmacSHA256"));
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+ final byte[] mySignature = mac.doFinal(data);
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+ if (!MessageDigest.isEqual(signature, mySignature)) {
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+ return false;
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+ }
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+ } catch (final InvalidKeyException | NoSuchAlgorithmException e) {
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+ throw new AssertionError(e);
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+ }
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+
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+ return true;
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+ }
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+
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+ public static InetAddress readAddress(final FriendlyByteBuf buf) {
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+ return InetAddresses.forString(buf.readUtf(Short.MAX_VALUE));
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+ }
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+
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+ public static GameProfile createProfile(final FriendlyByteBuf buf) {
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+ final GameProfile profile = new GameProfile(buf.readUUID(), buf.readUtf(16));
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+ readProperties(buf, profile);
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+ return profile;
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+ }
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+
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+ private static void readProperties(final FriendlyByteBuf buf, final GameProfile profile) {
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+ final int properties = buf.readVarInt();
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+ for (int i1 = 0; i1 < properties; i1++) {
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+ final String name = buf.readUtf(Short.MAX_VALUE);
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+ final String value = buf.readUtf(Short.MAX_VALUE);
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+ final String signature = buf.readBoolean() ? buf.readUtf(Short.MAX_VALUE) : null;
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+ profile.getProperties().put(name, new Property(name, value, signature));
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+ }
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+ }
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+
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+ public static ProfilePublicKey.Data readForwardedKey(FriendlyByteBuf buf) {
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+ return new ProfilePublicKey.Data(buf);
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+ }
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+
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+ public static UUID readSignerUuidOrElse(FriendlyByteBuf buf, UUID orElse) {
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+ return buf.readBoolean() ? buf.readUUID() : orElse;
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+ }
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+}
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diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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index 51b3db0b6c2cede95b584268e035c0fb36d38094..a7e133f3495e9132a5fdae2c24f225e7b026295a 100644
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--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
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@@ -274,13 +274,20 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
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server.enablePlugins(org.bukkit.plugin.PluginLoadOrder.STARTUP);
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// CraftBukkit end
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+ // Paper start
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+ boolean usingProxy = org.spigotmc.SpigotConfig.bungee || io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled;
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+ String proxyFlavor = (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) ? "Velocity" : "BungeeCord";
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+ String proxyLink = (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) ? "https://docs.papermc.io/velocity/security" : "http://www.spigotmc.org/wiki/firewall-guide/";
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+ // Paper end
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if (!this.usesAuthentication()) {
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DedicatedServer.LOGGER.warn("**** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!");
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DedicatedServer.LOGGER.warn("The server will make no attempt to authenticate usernames. Beware.");
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// Spigot start
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- if (org.spigotmc.SpigotConfig.bungee) {
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- 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.");
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- DedicatedServer.LOGGER.warn("Please see http://www.spigotmc.org/wiki/firewall-guide/ for further information.");
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+ // Paper start
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+ if (usingProxy) {
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+ 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.");
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+ DedicatedServer.LOGGER.warn("Please see " + proxyLink + " for further information.");
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+ // Paper end
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} else {
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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.");
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}
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diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
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index 0bedd9eadbfe1ce290f22d6c648571e25e3ae0e9..093822a5256e8e919350a000239a3e92a2379aaf 100644
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--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
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@@ -61,6 +61,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
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@Nullable
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private ServerPlayer delayedAcceptPlayer;
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public boolean iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation = false; // Paper - username validation overriding
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+ private int velocityLoginMessageId = -1; // Paper - Velocity support
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public ServerLoginPacketListenerImpl(MinecraftServer server, Connection connection) {
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this.state = ServerLoginPacketListenerImpl.State.HELLO;
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@@ -256,6 +257,16 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
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this.state = ServerLoginPacketListenerImpl.State.KEY;
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this.connection.send(new ClientboundHelloPacket("", this.server.getKeyPair().getPublic().getEncoded(), this.challenge));
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} else {
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+ // Paper start - Velocity support
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+ if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) {
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+ this.velocityLoginMessageId = java.util.concurrent.ThreadLocalRandom.current().nextInt();
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+ net.minecraft.network.FriendlyByteBuf buf = new net.minecraft.network.FriendlyByteBuf(io.netty.buffer.Unpooled.buffer());
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+ buf.writeByte(com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION);
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+ 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);
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+ this.connection.send(packet1);
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+ return;
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+ }
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+ // Paper end
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// Spigot start
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// Paper start - Cache authenticator threads
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authenticatorPool.execute(new Runnable() {
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@@ -363,6 +374,12 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
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public class LoginHandler {
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public void fireEvents() throws Exception {
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+ // Paper start - Velocity support
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+ if (ServerLoginPacketListenerImpl.this.velocityLoginMessageId == -1 && io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) {
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+ disconnect("This server requires you to connect with Velocity.");
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+ return;
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+ }
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+ // Paper end
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String playerName = ServerLoginPacketListenerImpl.this.gameProfile.getName();
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java.net.InetAddress address = ((java.net.InetSocketAddress) ServerLoginPacketListenerImpl.this.connection.getRemoteAddress()).getAddress();
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java.net.InetAddress rawAddress = ((java.net.InetSocketAddress) connection.getRawAddress()).getAddress(); // Paper
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@@ -411,6 +428,47 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
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// Spigot end
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public void handleCustomQueryPacket(ServerboundCustomQueryPacket packet) {
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+ // Paper start - Velocity support
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+ if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled && packet.getTransactionId() == this.velocityLoginMessageId) {
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+ net.minecraft.network.FriendlyByteBuf buf = packet.getData();
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+ if (buf == null) {
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+ this.disconnect("This server requires you to connect with Velocity.");
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+ return;
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+ }
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+
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+ if (!com.destroystokyo.paper.proxy.VelocityProxy.checkIntegrity(buf)) {
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+ this.disconnect("Unable to verify player details");
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+ return;
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+ }
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+
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+ int version = buf.readVarInt();
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+ if (version > com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION) {
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+ throw new IllegalStateException("Unsupported forwarding version " + version + ", wanted upto " + com.destroystokyo.paper.proxy.VelocityProxy.MAX_SUPPORTED_FORWARDING_VERSION);
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+ }
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+
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+ java.net.SocketAddress listening = this.connection.getRemoteAddress();
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+ int port = 0;
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+ if (listening instanceof java.net.InetSocketAddress) {
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+ port = ((java.net.InetSocketAddress) listening).getPort();
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+ }
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+ this.connection.address = new java.net.InetSocketAddress(com.destroystokyo.paper.proxy.VelocityProxy.readAddress(buf), port);
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+
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+ this.gameProfile = com.destroystokyo.paper.proxy.VelocityProxy.createProfile(buf);
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+
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+ //TODO Update handling for lazy sessions, might not even have to do anything?
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+
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+ // Proceed with login
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+ authenticatorPool.execute(() -> {
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+ try {
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+ new LoginHandler().fireEvents();
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+ } catch (Exception ex) {
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+ disconnect("Failed to verify username!");
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+ server.server.getLogger().log(java.util.logging.Level.WARNING, "Exception verifying " + gameProfile.getName(), ex);
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+ }
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+ });
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+ return;
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+ }
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+ // Paper end
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this.disconnect(Component.translatable("multiplayer.disconnect.unexpected_query_response"));
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}
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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index 52dec44a061b773c4467279c766f504d079dd1a4..bbb8335dae0a3e2761e6bbb8dc723bcf28cd82ba 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
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@@ -779,7 +779,7 @@ public final class CraftServer implements Server {
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@Override
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public long getConnectionThrottle() {
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// Spigot Start - Automatically set connection throttle for bungee configurations
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- if (org.spigotmc.SpigotConfig.bungee) {
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+ if (org.spigotmc.SpigotConfig.bungee || io.papermc.paper.configuration.GlobalConfiguration.get().proxies.velocity.enabled) { // Paper - Velocity support
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return -1;
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} else {
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return this.configuration.getInt("settings.connection-throttle");
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