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Paper/patches/server/0978-Validate-ResourceLocation-in-NBT-reading.patch
Nassim Jahnke 4939f87118
Add more ResourceLocation checks, some cleanup
2024-02-18 13:52:12 +01:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Thu, 4 Jan 2024 13:49:14 +0100
Subject: [PATCH] Validate ResourceLocation in NBT reading
diff --git a/src/main/java/net/minecraft/nbt/NbtUtils.java b/src/main/java/net/minecraft/nbt/NbtUtils.java
index ba0726157417cdde1c9bca93a9e37e68d9b2286d..e3a3f19a6e63fd42e29c418e5a7439972484d492 100644
--- a/src/main/java/net/minecraft/nbt/NbtUtils.java
+++ b/src/main/java/net/minecraft/nbt/NbtUtils.java
@@ -230,8 +230,10 @@ public final class NbtUtils {
if (!nbt.contains("Name", 8)) {
return Blocks.AIR.defaultBlockState();
} else {
- ResourceLocation resourceLocation = new ResourceLocation(nbt.getString("Name"));
- Optional<? extends Holder<Block>> optional = blockLookup.get(ResourceKey.create(Registries.BLOCK, resourceLocation));
+ // Paper start - Validate resource location
+ ResourceLocation resourceLocation = ResourceLocation.tryParse(nbt.getString("Name"));
+ Optional<? extends Holder<Block>> optional = resourceLocation != null ? blockLookup.get(ResourceKey.create(Registries.BLOCK, resourceLocation)) : Optional.empty();
+ // Paper end - Validate resource location
if (optional.isEmpty()) {
return Blocks.AIR.defaultBlockState();
} else {
diff --git a/src/main/java/net/minecraft/resources/ResourceLocation.java b/src/main/java/net/minecraft/resources/ResourceLocation.java
index 5f9dcab27a07969c93555ad0892683c62cbebc8c..a4d875df936b6de16f0233482b03af05b427a79f 100644
--- a/src/main/java/net/minecraft/resources/ResourceLocation.java
+++ b/src/main/java/net/minecraft/resources/ResourceLocation.java
@@ -31,6 +31,13 @@ public class ResourceLocation implements Comparable<ResourceLocation> {
private final String path;
protected ResourceLocation(String namespace, String path, @Nullable ResourceLocation.Dummy extraData) {
+ // Paper start - Validate ResourceLocation
+ // Check for the max network string length (capped at Short.MAX_VALUE) as well as the max bytes of a StringTag (length written as an unsigned short)
+ final String resourceLocation = namespace + ":" + path;
+ if (resourceLocation.length() > Short.MAX_VALUE || io.netty.buffer.ByteBufUtil.utf8MaxBytes(resourceLocation) > 2 * Short.MAX_VALUE + 1) {
+ throw new ResourceLocationException("Resource location too long: " + resourceLocation);
+ }
+ // Paper end - Validate ResourceLocation
this.namespace = namespace;
this.path = path;
}
diff --git a/src/main/java/net/minecraft/world/entity/EntityType.java b/src/main/java/net/minecraft/world/entity/EntityType.java
index 8ba573bb4099ee5b27b61f333e72d794c48d5f29..69bdf3f2ee731e59e8d454816a9ca72cb49c0fe0 100644
--- a/src/main/java/net/minecraft/world/entity/EntityType.java
+++ b/src/main/java/net/minecraft/world/entity/EntityType.java
@@ -614,7 +614,7 @@ public class EntityType<T extends Entity> implements FeatureElement, EntityTypeT
}
public static Optional<EntityType<?>> by(CompoundTag nbt) {
- return BuiltInRegistries.ENTITY_TYPE.getOptional(new ResourceLocation(nbt.getString("id")));
+ return BuiltInRegistries.ENTITY_TYPE.getOptional(ResourceLocation.tryParse(nbt.getString("id"))); // Paper - Validate ResourceLocation
}
@Nullable
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 6502dfa62fb0e5a0e3369c62c6ad97aecced4d2b..484056cf77334818aab98ad20e99685d1e240adc 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -871,12 +871,13 @@ public abstract class LivingEntity extends Entity implements Attackable {
if (nbt.contains("SleepingX", 99) && nbt.contains("SleepingY", 99) && nbt.contains("SleepingZ", 99)) {
BlockPos blockposition = new BlockPos(nbt.getInt("SleepingX"), nbt.getInt("SleepingY"), nbt.getInt("SleepingZ"));
-
+ if (this.position().distanceToSqr(blockposition.getX(), blockposition.getY(), blockposition.getZ()) < 16 * 16) { // Paper - The sleeping pos will always also set the actual pos, so a desync suggests something is wrong
this.setSleepingPos(blockposition);
this.entityData.set(LivingEntity.DATA_POSE, Pose.SLEEPING);
if (!this.firstTick) {
this.setPosToBed(blockposition);
}
+ } // Paper - The sleeping pos will always also set the actual pos, so a desync suggests something is wrong
}
if (nbt.contains("Brain", 10)) {
diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 9ecabac9e95bb0b550260770fcc713ad82070d0b..fd093e5bc79a44e02f57bacd8273dc87342f5709 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -607,7 +607,7 @@ public abstract class Mob extends LivingEntity implements Targeting {
this.setLeftHanded(nbt.getBoolean("LeftHanded"));
if (nbt.contains("DeathLootTable", 8)) {
- this.lootTable = new ResourceLocation(nbt.getString("DeathLootTable"));
+ this.lootTable = ResourceLocation.tryParse(nbt.getString("DeathLootTable")); // Paper - Validate ResourceLocation
this.lootTableSeed = nbt.getLong("DeathLootTableSeed");
}
diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
index 618de60680de015bc68bf95a68eda98db7bab3c5..d14eab0d83d629a4522bf3f7d789d2853eb84f06 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
@@ -560,7 +560,7 @@ public abstract class AbstractArrow extends Projectile {
this.setCritArrow(nbt.getBoolean("crit"));
this.setPierceLevel(nbt.getByte("PierceLevel"));
if (nbt.contains("SoundEvent", 8)) {
- this.soundEvent = (SoundEvent) BuiltInRegistries.SOUND_EVENT.getOptional(new ResourceLocation(nbt.getString("SoundEvent"))).orElse(this.getDefaultHitGroundSoundEvent());
+ this.soundEvent = (SoundEvent) BuiltInRegistries.SOUND_EVENT.getOptional(ResourceLocation.tryParse(nbt.getString("SoundEvent"))).orElse(this.getDefaultHitGroundSoundEvent()); // Paper - Validate resource location
}
this.setShotFromCrossbow(nbt.getBoolean("ShotFromCrossbow"));
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
index 7529751afa2932fd16bc4591189b0358268a7b14..e2e1c7a017e82dc7299e5cd1783818e4f0319c0b 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/ContainerEntity.java
@@ -67,7 +67,7 @@ public interface ContainerEntity extends Container, MenuProvider {
default void readChestVehicleSaveData(CompoundTag nbt) {
this.clearItemStacks();
if (nbt.contains("LootTable", 8)) {
- this.setLootTable(new ResourceLocation(nbt.getString("LootTable")));
+ this.setLootTable(ResourceLocation.tryParse(nbt.getString("LootTable"))); // Paper - Validate ResourceLocation
this.setLootTableSeed(nbt.getLong("LootTableSeed"));
}
diff --git a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
index d04fc84eef11adb5ea64077f48794b6ed7fb3ada..89d06253b00604114e543ebbe12a9993ae95dc41 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
@@ -290,7 +290,12 @@ public abstract class AbstractFurnaceBlockEntity extends BaseContainerBlockEntit
while (iterator.hasNext()) {
String s = (String) iterator.next();
- this.recipesUsed.put(new ResourceLocation(s), nbttagcompound1.getInt(s));
+ // Paper start - Validate ResourceLocation
+ final ResourceLocation resourceLocation = ResourceLocation.tryParse(s);
+ if (resourceLocation != null) {
+ this.recipesUsed.put(resourceLocation, nbttagcompound1.getInt(s));
+ }
+ // Paper end - Validate ResourceLocation
}
// Paper start - cook speed multiplier API
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
index b5b1831631e233a96b6fd55972a8862b0f420da8..3f62e823bf9b5aa696e3c240613a0fb50340875e 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BrushableBlockEntity.java
@@ -199,7 +199,7 @@ public class BrushableBlockEntity extends BlockEntity {
private boolean tryLoadLootTable(CompoundTag nbt) {
if (nbt.contains("LootTable", 8)) {
- this.lootTable = new ResourceLocation(nbt.getString("LootTable"));
+ this.lootTable = ResourceLocation.tryParse(nbt.getString("LootTable")); // Paper - Validate ResourceLocation
this.lootTableSeed = nbt.getLong("LootTableSeed");
return true;
} else {
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