Allow enabling sand duping (#10191)
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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673 changed files with 157 additions and 189 deletions
150
patches/server/0618-Get-entity-default-attributes.patch
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150
patches/server/0618-Get-entity-default-attributes.patch
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@ -0,0 +1,150 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Fri, 20 Aug 2021 13:03:21 -0700
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Subject: [PATCH] Get entity default attributes
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== AT ==
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public net.minecraft.world.entity.ai.attributes.AttributeSupplier getAttributeInstance(Lnet/minecraft/world/entity/ai/attributes/Attribute;)Lnet/minecraft/world/entity/ai/attributes/AttributeInstance;
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diff --git a/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..12135ffeacd648f6bc4d7d327059ea1a7e8c79c4
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeInstance.java
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@@ -0,0 +1,30 @@
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+package io.papermc.paper.attribute;
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+
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+import net.minecraft.world.entity.ai.attributes.AttributeInstance;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeModifier;
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+import org.bukkit.craftbukkit.attribute.CraftAttributeInstance;
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+
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+import java.util.Collection;
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+
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+public class UnmodifiableAttributeInstance extends CraftAttributeInstance {
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+
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+ public UnmodifiableAttributeInstance(AttributeInstance handle, Attribute attribute) {
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+ super(handle, attribute);
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+ }
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+
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+ @Override
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+ public void setBaseValue(double d) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+
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+ @Override
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+ public void addModifier(AttributeModifier modifier) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+
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+ @Override
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+ public void removeModifier(AttributeModifier modifier) {
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+ throw new UnsupportedOperationException("Cannot modify default attributes");
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+ }
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+}
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diff --git a/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..68044b8439c302114240d0ae4da93ab3e0789cd2
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--- /dev/null
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+++ b/src/main/java/io/papermc/paper/attribute/UnmodifiableAttributeMap.java
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@@ -0,0 +1,32 @@
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+package io.papermc.paper.attribute;
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+
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+import net.minecraft.world.entity.ai.attributes.AttributeSupplier;
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+import org.bukkit.attribute.Attributable;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeInstance;
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+import org.bukkit.craftbukkit.attribute.CraftAttribute;
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+import org.jetbrains.annotations.NotNull;
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+import org.jetbrains.annotations.Nullable;
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+
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+public class UnmodifiableAttributeMap implements Attributable {
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+
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+ private final AttributeSupplier handle;
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+
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+ public UnmodifiableAttributeMap(@NotNull AttributeSupplier handle) {
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+ this.handle = handle;
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+ }
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+
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+ @Override
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+ public @Nullable AttributeInstance getAttribute(@NotNull Attribute attribute) {
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+ net.minecraft.world.entity.ai.attributes.Attribute nmsAttribute = CraftAttribute.bukkitToMinecraft(attribute);
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+ if (!this.handle.hasAttribute(nmsAttribute)) {
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+ return null;
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+ }
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+ return new UnmodifiableAttributeInstance(this.handle.getAttributeInstance(nmsAttribute), attribute);
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+ }
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+
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+ @Override
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+ public void registerAttribute(@NotNull Attribute attribute) {
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+ throw new UnsupportedOperationException("Cannot register new attributes here");
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+ }
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+}
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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index b89171cb89e3d38f3260ead8549cccde904db7c4..efa904eac6e3c2995f5a03fca44340d083e73b77 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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@@ -576,6 +576,18 @@ public final class CraftMagicNumbers implements UnsafeValues {
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public int getProtocolVersion() {
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return net.minecraft.SharedConstants.getCurrentVersion().getProtocolVersion();
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}
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+
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+ @Override
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+ public boolean hasDefaultEntityAttributes(NamespacedKey bukkitEntityKey) {
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+ return net.minecraft.world.entity.ai.attributes.DefaultAttributes.hasSupplier(net.minecraft.core.registries.BuiltInRegistries.ENTITY_TYPE.get(CraftNamespacedKey.toMinecraft(bukkitEntityKey)));
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+ }
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+
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+ @Override
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+ public org.bukkit.attribute.Attributable getDefaultEntityAttributes(NamespacedKey bukkitEntityKey) {
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+ Preconditions.checkArgument(hasDefaultEntityAttributes(bukkitEntityKey), bukkitEntityKey + " doesn't have default attributes");
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+ var supplier = net.minecraft.world.entity.ai.attributes.DefaultAttributes.getSupplier((net.minecraft.world.entity.EntityType<? extends net.minecraft.world.entity.LivingEntity>) net.minecraft.core.registries.BuiltInRegistries.ENTITY_TYPE.get(CraftNamespacedKey.toMinecraft(bukkitEntityKey)));
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+ return new io.papermc.paper.attribute.UnmodifiableAttributeMap(supplier);
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+ }
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// Paper end
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/**
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diff --git a/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java b/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..e8cdfa385230d3de202122e4df5e07f61f80ce75
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--- /dev/null
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+++ b/src/test/java/io/papermc/paper/attribute/EntityTypeAttributesTest.java
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@@ -0,0 +1,39 @@
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+package io.papermc.paper.attribute;
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+
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+import org.bukkit.attribute.Attributable;
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+import org.bukkit.attribute.Attribute;
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+import org.bukkit.attribute.AttributeInstance;
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+import org.bukkit.attribute.AttributeModifier;
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+import org.bukkit.entity.EntityType;
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+import org.bukkit.support.AbstractTestingBase;
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+import org.junit.jupiter.api.Test;
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+
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+import static org.junit.jupiter.api.Assertions.assertFalse;
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+import static org.junit.jupiter.api.Assertions.assertNotNull;
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+import static org.junit.jupiter.api.Assertions.assertThrows;
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+import static org.junit.jupiter.api.Assertions.assertTrue;
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+
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+public class EntityTypeAttributesTest extends AbstractTestingBase {
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+
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+ @Test
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+ public void testIllegalEntity() {
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+ assertFalse(EntityType.EGG.hasDefaultAttributes());
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+ assertThrows(IllegalArgumentException.class, () -> EntityType.EGG.getDefaultAttributes());
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+ }
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+
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+ @Test
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+ public void testLegalEntity() {
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+ assertTrue(EntityType.ZOMBIE.hasDefaultAttributes());
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+ EntityType.ZOMBIE.getDefaultAttributes();
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+ }
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+
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+ @Test
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+ public void testUnmodifiabilityOfAttributable() {
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+ Attributable attributable = EntityType.ZOMBIE.getDefaultAttributes();
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+ assertThrows(UnsupportedOperationException.class, () -> attributable.registerAttribute(Attribute.GENERIC_ATTACK_DAMAGE));
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+ AttributeInstance instance = attributable.getAttribute(Attribute.GENERIC_FOLLOW_RANGE);
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+ assertNotNull(instance);
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+ assertThrows(UnsupportedOperationException.class, () -> instance.addModifier(new AttributeModifier("test", 3, AttributeModifier.Operation.ADD_NUMBER)));
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+ assertThrows(UnsupportedOperationException.class, () -> instance.setBaseValue(3.2));
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+ }
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+}
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