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e792da723a
Paper/Spigot-Server-Patches/0479-Protect-Bedrock-and-End-Portal-Frames-from-being-des.patch
Daniel Ennis e792da723a
Updated Upstream (Bukkit/CraftBukkit/Spigot) (#4728) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
30885166 Update to Minecraft 1.16.4

CraftBukkit Changes:
3af81c71 Update to Minecraft 1.16.4

Spigot Changes:
f011ca24 Update to Minecraft 1.16.4

Co-authored-by: Mariell Hoversholm <proximyst@proximyst.com>
2020-11-02 20:22:15 -06:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 13 May 2020 23:01:26 -0400
Subject: [PATCH] Protect Bedrock and End Portal/Frames from being destroyed
This fixes exploits that let players destroy bedrock by Pistons, explosions
and Mushrooom/Tree generation.
These blocks are designed to not be broken except by creative players/commands.
So protect them from a multitude of methods of destroying them.
A config is provided if you rather let players use these exploits, and let
them destroy the worlds End Portals and get on top of the nether easy.
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 273ed1c5537a69256f1020646f5cd0c13d50f170..e750aedfad992635019d1abd7c880f4829b1e41d 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -411,4 +411,17 @@ public class PaperConfig {
private static void midTickChunkTasks() {
midTickChunkTasks = getInt("settings.chunk-tasks-per-tick", midTickChunkTasks);
}
+
+ public static boolean allowBlockPermanentBreakingExploits = false;
+ private static void allowBlockPermanentBreakingExploits() {
+ if (config.contains("allow-perm-block-break-exploits")) {
+ allowBlockPermanentBreakingExploits = config.getBoolean("allow-perm-block-break-exploits", false);
+ config.set("allow-perm-block-break-exploits", null);
+ }
+
+ config.set("settings.unsupported-settings.allow-permanent-block-break-exploits-readme", "This setting controls if players should be able to break bedrock, end portals and other intended to be permanent blocks.");
+ allowBlockPermanentBreakingExploits = getBoolean("settings.unsupported-settings.allow-permanent-block-break-exploits", allowBlockPermanentBreakingExploits);
+
+ }
+
}
diff --git a/src/main/java/net/minecraft/server/Block.java b/src/main/java/net/minecraft/server/Block.java
index b364ceafb4c3412b0d11b3b2e8b4321ed96769bb..a45ceff9ff970b996b2767379a2ecd4693f52d3a 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -23,6 +23,19 @@ public class Block extends BlockBase implements IMaterial {
protected final BlockStateList<Block, IBlockData> blockStateList;
private IBlockData blockData;
// Paper start
+ public final boolean isDestroyable() {
+ return com.destroystokyo.paper.PaperConfig.allowBlockPermanentBreakingExploits ||
+ this != Blocks.BEDROCK &&
+ this != Blocks.END_PORTAL_FRAME &&
+ this != Blocks.END_PORTAL &&
+ this != Blocks.END_GATEWAY &&
+ this != Blocks.COMMAND_BLOCK &&
+ this != Blocks.REPEATING_COMMAND_BLOCK &&
+ this != Blocks.CHAIN_COMMAND_BLOCK &&
+ this != Blocks.BARRIER &&
+ this != Blocks.STRUCTURE_BLOCK &&
+ this != Blocks.JIGSAW;
+ }
public co.aikar.timings.Timing timing;
public co.aikar.timings.Timing getTiming() {
if (timing == null) {
diff --git a/src/main/java/net/minecraft/server/BlockBase.java b/src/main/java/net/minecraft/server/BlockBase.java
index 62e7c6cb1b363d1ee626c4405f8c30e74aba03e9..1c06647fb6f8e757ca7a737a371cb1dec2aeb80e 100644
--- a/src/main/java/net/minecraft/server/BlockBase.java
+++ b/src/main/java/net/minecraft/server/BlockBase.java
@@ -138,7 +138,7 @@ public abstract class BlockBase {
@Deprecated
public boolean a(IBlockData iblockdata, BlockActionContext blockactioncontext) {
- return this.material.isReplaceable() && (blockactioncontext.getItemStack().isEmpty() || blockactioncontext.getItemStack().getItem() != this.getItem());
+ return this.material.isReplaceable() && (blockactioncontext.getItemStack().isEmpty() || blockactioncontext.getItemStack().getItem() != this.getItem()) && (iblockdata.isDestroyable() || (blockactioncontext.getEntity() != null && blockactioncontext.getEntity().abilities.canInstantlyBuild)); // Paper
}
@Deprecated
@@ -342,7 +342,11 @@ public abstract class BlockBase {
public Block getBlock() {
return (Block) this.c;
}
-
+ // Paper start
+ public final boolean isDestroyable() {
+ return getBlock().isDestroyable();
+ }
+ // Paper end
public Material getMaterial() {
return this.g;
}
@@ -432,7 +436,7 @@ public abstract class BlockBase {
}
public EnumPistonReaction getPushReaction() {
- return this.getBlock().getPushReaction(this.p());
+ return !isDestroyable() ? EnumPistonReaction.BLOCK : this.getBlock().getPushReaction(this.p()); // Paper
}
public boolean i(IBlockAccess iblockaccess, BlockPosition blockposition) {
diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java
index 417d1a6c3dbd23905672a847939d92a953bbc91c..0bab7dfb053c1aa92f5417c25fed5484e09bbec3 100644
--- a/src/main/java/net/minecraft/server/BlockPiston.java
+++ b/src/main/java/net/minecraft/server/BlockPiston.java
@@ -165,6 +165,12 @@ public class BlockPiston extends BlockDirectional {
@Override
public boolean a(IBlockData iblockdata, World world, BlockPosition blockposition, int i, int j) {
EnumDirection enumdirection = (EnumDirection) iblockdata.get(BlockPiston.FACING);
+ // Paper start - prevent retracting when we're facing the wrong way (we were replaced before retraction could occur)
+ EnumDirection directionQueuedAs = EnumDirection.fromType1(j & 7); // Paper - copied from below
+ if (!com.destroystokyo.paper.PaperConfig.allowBlockPermanentBreakingExploits && enumdirection != directionQueuedAs) {
+ return false;
+ }
+ // Paper end - prevent retracting when we're facing the wrong way
if (!world.isClientSide) {
boolean flag = this.a(world, blockposition, enumdirection);
@@ -196,7 +202,7 @@ public class BlockPiston extends BlockDirectional {
IBlockData iblockdata1 = (IBlockData) ((IBlockData) Blocks.MOVING_PISTON.getBlockData().set(BlockPistonMoving.a, enumdirection)).set(BlockPistonMoving.b, this.sticky ? BlockPropertyPistonType.STICKY : BlockPropertyPistonType.DEFAULT);
world.setTypeAndData(blockposition, iblockdata1, 20);
- world.setTileEntity(blockposition, BlockPistonMoving.a((IBlockData) this.getBlockData().set(BlockPiston.FACING, EnumDirection.fromType1(j & 7)), enumdirection, false, true));
+ world.setTileEntity(blockposition, BlockPistonMoving.a((IBlockData) this.getBlockData().set(BlockPiston.FACING, EnumDirection.fromType1(j & 7)), enumdirection, false, true)); // Paper - diff on change, j is facing direction - copy this above
world.update(blockposition, iblockdata1.getBlock());
iblockdata1.a(world, blockposition, 2);
if (this.sticky) {
@@ -225,7 +231,14 @@ public class BlockPiston extends BlockDirectional {
}
}
} else {
- world.a(blockposition.shift(enumdirection), false);
+ // Paper start - fix headless pistons breaking blocks
+ BlockPosition headPos = blockposition.shift(enumdirection);
+ if (com.destroystokyo.paper.PaperConfig.allowBlockPermanentBreakingExploits || world.getType(headPos) == Blocks.PISTON_HEAD.getBlockData().set(FACING, enumdirection)) { // double check to make sure we're not a headless piston.
+ world.setAir(headPos, false);
+ } else {
+ ((WorldServer)world).getChunkProvider().flagDirty(headPos); // ... fix client desync
+ }
+ // Paper end - fix headless pistons breaking blocks
}
world.playSound((EntityHuman) null, blockposition, SoundEffects.BLOCK_PISTON_CONTRACT, SoundCategory.BLOCKS, 0.5F, world.random.nextFloat() * 0.15F + 0.6F);
diff --git a/src/main/java/net/minecraft/server/Explosion.java b/src/main/java/net/minecraft/server/Explosion.java
index a552cc5bebb1a70db2e679a514769d0ad791ad68..72de544c0782e4daff222a0ca04e5bc870cf148c 100644
--- a/src/main/java/net/minecraft/server/Explosion.java
+++ b/src/main/java/net/minecraft/server/Explosion.java
@@ -125,6 +125,7 @@ public class Explosion {
for (float f1 = 0.3F; f > 0.0F; f -= 0.22500001F) {
BlockPosition blockposition = new BlockPosition(d4, d5, d6);
IBlockData iblockdata = this.world.getType(blockposition);
+ if (!iblockdata.isDestroyable()) continue; // Paper
Fluid fluid = iblockdata.getFluid(); // Paper
Optional<Float> optional = this.l.a(this, this.world, blockposition, iblockdata, fluid);
@@ -278,7 +279,7 @@ public class Explosion {
IBlockData iblockdata = this.world.getType(blockposition);
Block block = iblockdata.getBlock();
- if (!iblockdata.isAir()) {
+ if (!iblockdata.isAir() && iblockdata.isDestroyable()) { // Paper
BlockPosition blockposition1 = blockposition.immutableCopy();
this.world.getMethodProfiler().enter("explosion_blocks");
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 265dafc2e2afc98d2490fa8707a5b72a5543bc9e..fb3776c00cf8b5125550e8a2bc6c270ba8a80dc5 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -362,6 +362,10 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
public boolean a(BlockPosition blockposition, IBlockData iblockdata, int i, int j) {
// CraftBukkit start - tree generation
if (this.captureTreeGeneration) {
+ // Paper start
+ IBlockData type = getType(blockposition);
+ if (!type.isDestroyable()) return false;
+ // Paper end
CraftBlockState blockstate = capturedBlockStates.get(blockposition);
if (blockstate == null) {
blockstate = CapturedBlockState.getTreeBlockState(this, blockposition, i);
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