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Allow enabling sand duping (#10191)

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Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable.
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Owen 2024-03-03 17:05:34 -05:00 • committed by GitHub
parent b21eb4d9a4
commit 89d51d5f29
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GPG key ID: B5690EEEBB952194
673 changed files with 157 additions and 189 deletions
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patches/server/0621-Add-ItemFactory-getSpawnEgg-API.patch Normal file
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@ -0,0 +1,50 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Thu, 14 Oct 2021 12:09:39 -0500
Subject: [PATCH] Add ItemFactory#getSpawnEgg API
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
index 12f90520e4d6d5fcea0c2f8e19dad9102970cd99..ef0c6e04a89704688f7b5461b27c0036abbf647d 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemFactory.java
@@ -564,4 +564,19 @@ public final class CraftItemFactory implements ItemFactory {
new net.md_5.bungee.api.chat.TextComponent(customName));
}
// Paper end - bungee hover events
+
+ // Paper start - old getSpawnEgg API
+ // @Override // used to override, upstream added conflicting method, is called via Commodore now
+ @Deprecated
+ public ItemStack getSpawnEgg0(org.bukkit.entity.EntityType type) {
+ if (type == null) {
+ return null;
+ }
+ String typeId = type.getKey().toString();
+ net.minecraft.resources.ResourceLocation typeKey = new net.minecraft.resources.ResourceLocation(typeId);
+ net.minecraft.world.entity.EntityType<?> nmsType = net.minecraft.core.registries.BuiltInRegistries.ENTITY_TYPE.get(typeKey);
+ net.minecraft.world.item.SpawnEggItem eggItem = net.minecraft.world.item.SpawnEggItem.byId(nmsType);
+ return eggItem == null ? null : new net.minecraft.world.item.ItemStack(eggItem).asBukkitMirror();
+ }
+ // Paper end - old getSpawnEgg API
}
diff --git a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
index 6d6a7abe1aa39a2e4ecf3ac5f55b1f227e1a9db9..010014c06fcea7d603160928f124f54d6e5e63d8 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
@@ -396,6 +396,15 @@ public class Commodore {
}
// Paper end
+ // Paper start - ItemFactory#getSpawnEgg (paper had original method that returned ItemStack, upstream added identical but returned Material)
+ if (owner.equals("org/bukkit/inventory/ItemFactory") && name.equals("getSpawnEgg") && desc.equals("(Lorg/bukkit/entity/EntityType;)Lorg/bukkit/inventory/ItemStack;")) {
+ super.visitInsn(Opcodes.SWAP); // has 1 param, this moves the owner instance to the top for the checkcast
+ super.visitTypeInsn(Opcodes.CHECKCAST, CB_PACKAGE + "/inventory/CraftItemFactory");
+ super.visitInsn(Opcodes.SWAP); // moves param back to the the top of stack
+ super.visitMethodInsn(Opcodes.INVOKEVIRTUAL, CB_PACKAGE + "/inventory/CraftItemFactory", "getSpawnEgg0", desc, false);
+ return;
+ }
+ // Paper end - ItemFactory#getSpawnEgg
if (modern) {
if (owner.equals("org/bukkit/Material") || (instantiatedMethodType != null && instantiatedMethodType.getDescriptor().startsWith("(Lorg/bukkit/Material;)"))) {
switch (name) {