PaperMC/patches/server/0864-Sanitize-Sent-BlockEntity-NBT.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Fri, 3 Dec 2021 16:55:50 -0500
Subject: [PATCH] Sanitize Sent BlockEntity NBT


diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
index 12d7cb0eb485987d245454fa2d9fef67ea7e9c76..b1e326cf4f7fe447f81b588dcb0eda9a435e59a8 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundBlockEntityDataPacket.java
@@ -17,7 +17,7 @@ public class ClientboundBlockEntityDataPacket implements Packet<ClientGamePacket
     private final CompoundTag tag;
 
     public static ClientboundBlockEntityDataPacket create(BlockEntity blockEntity, Function<BlockEntity, CompoundTag> nbtGetter) {
-        return new ClientboundBlockEntityDataPacket(blockEntity.getBlockPos(), blockEntity.getType(), nbtGetter.apply(blockEntity));
+        return new ClientboundBlockEntityDataPacket(blockEntity.getBlockPos(), blockEntity.getType(), blockEntity.sanitizeSentNbt(nbtGetter.apply(blockEntity))); // Paper - Sanitize sent data
     }
 
     public static ClientboundBlockEntityDataPacket create(BlockEntity blockEntity) {
diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
index 2b35059cfe7a27238e0a74df058733897a26ac1c..76b6437a1d807c7e1b673f8feeed1f171ee9a803 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundLevelChunkPacketData.java
@@ -183,6 +183,7 @@ public class ClientboundLevelChunkPacketData {
             CompoundTag compoundTag = blockEntity.getUpdateTag();
             BlockPos blockPos = blockEntity.getBlockPos();
             int i = SectionPos.sectionRelative(blockPos.getX()) << 4 | SectionPos.sectionRelative(blockPos.getZ());
+            blockEntity.sanitizeSentNbt(compoundTag); // Paper - Sanitize sent data
             return new ClientboundLevelChunkPacketData.BlockEntityInfo(i, blockPos.getY(), blockEntity.getType(), compoundTag.isEmpty() ? null : compoundTag);
         }
     }
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
index d62181bd8bccfcfdd7da8f635bdf7ebc36294705..b96d57b0bcf21508f8e03e96b7553eb486fdf212 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
@@ -256,4 +256,12 @@ public abstract class BlockEntity {
         return null;
     }
     // CraftBukkit end
+    // Paper start
+    public CompoundTag sanitizeSentNbt(CompoundTag tag) {
+        tag.remove("PublicBukkitValues");
+
+        return tag;
+    }
+    // Paper end
+
 }