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Add support for Velocity forwarding v2

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This is strictly not needed, however, I wanted to write this in part
to test the new forwarding logic, parsing and advertising the latest
featureset is also not exactly a bad thing
This commit is contained in:
Shane Freeder 2022-06-09 14:27:06 +01:00
parent df842f3d43
commit 945316dc5d
1 changed files with 28 additions and 6 deletions
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34
patches/server/Add-Velocity-IP-Forwarding-Support.patch
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@ -34,9 +34,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+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 byte MAX_SUPPORTED_FORWARDING_VERSION = 2;
+ public static final ResourceLocation PLAYER_INFO_CHANNEL = new ResourceLocation("velocity", "player_info");
+
+ public static boolean checkIntegrity(final FriendlyByteBuf buf) {
@ -57,11 +60,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ 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;
+ }
+
@ -84,6 +82,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ profile.getProperties().put(name, new Property(name, value, signature));
+ }
+ }
+
+ public static ProfilePublicKey.Data readForwardedKey(FriendlyByteBuf buf) {
+ return new ProfilePublicKey.Data(buf);
+ }
+}
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
@ -104,7 +106,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ // 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.protocol.login.ClientboundCustomQueryPacket packet1 = new net.minecraft.network.protocol.login.ClientboundCustomQueryPacket(this.velocityLoginMessageId, com.destroystokyo.paper.proxy.VelocityProxy.PLAYER_INFO_CHANNEL, new net.minecraft.network.FriendlyByteBuf(io.netty.buffer.Unpooled.EMPTY_BUFFER));
+ 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;
+ }
@ -142,6 +146,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ 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) {
@ -151,6 +160,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+
+ this.gameProfile = com.destroystokyo.paper.proxy.VelocityProxy.createProfile(buf);
+
+ // We should already have this, but, we'll read it out anyway
+ //noinspection NonStrictComparisonCanBeEquality
+ if (version >= com.destroystokyo.paper.proxy.VelocityProxy.MODERN_FORWARDING_WITH_KEY) {
+ final ProfilePublicKey.Data forwardedKey = com.destroystokyo.paper.proxy.VelocityProxy.readForwardedKey(buf);
+ if (this.playerProfilePublicKey == null) {
+ try {
+ this.playerProfilePublicKey = ProfilePublicKey.createValidated(this.server.getServiceSignatureValidator(), forwardedKey);
+ } catch (CryptException e) {
+ this.disconnect("Unable to validate forwarded player key");
+ }
+ }
+ }
+
+ // Proceed with login
+ authenticatorPool.execute(() -> {
+ try {