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PaperMC/patches/server/0427-Protect-Bedrock-and-End-Portal-Frames-from-being-des.patch
Jake 00be0b7b30 Updated Upstream (Bukkit/CraftBukkit/Spigot) 
Upstream has released updates that appear 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:
d25437bc Update to Minecraft 1.18-pre8

CraftBukkit Changes:
5a39a236 Update to Minecraft 1.18-pre8

Spigot Changes:
7840c2af Update to Minecraft 1.18-pre8
2021-11-30 19:26:33 +01:00

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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 68dc68238adc8d288052132e9f70663e8bba1e80..bfaaa80a5b144bd46ff3ea6a782aa87e5c51e8ea 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -434,4 +434,15 @@ public class PaperConfig {
private static void loggerSettings() {
deobfuscateStacktraces = getBoolean("settings.loggers.deobfuscate-stacktraces", deobfuscateStacktraces);
}
+
+ 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/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
index 548f103e648d9670d7434182c6598dc29ae77b57..f0c789d339fe8402c9c2a684d7e0415fa298b20e 100644
--- a/src/main/java/net/minecraft/world/level/Explosion.java
+++ b/src/main/java/net/minecraft/world/level/Explosion.java
@@ -173,6 +173,7 @@ public class Explosion {
for (float f1 = 0.3F; f > 0.0F; f -= 0.22500001F) {
BlockPos blockposition = new BlockPos(d4, d5, d6);
BlockState iblockdata = this.level.getBlockState(blockposition);
+ if (!iblockdata.isDestroyable()) continue; // Paper
FluidState fluid = iblockdata.getFluidState(); // Paper
if (!this.level.isInWorldBounds(blockposition)) {
@@ -330,7 +331,7 @@ public class Explosion {
BlockState iblockdata = this.level.getBlockState(blockposition);
Block block = iblockdata.getBlock();
- if (!iblockdata.isAir()) {
+ if (!iblockdata.isAir() && iblockdata.isDestroyable()) { // Paper
BlockPos blockposition1 = blockposition.immutable();
this.level.getProfiler().push("explosion_blocks");
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 4a77494ddb94d5fd2d82665c6bd4e513b66f1d9f..0bcb14f1377d603c93c471ce206d2e38d0278b60 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -414,6 +414,10 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
public boolean setBlock(BlockPos pos, BlockState state, int flags, int maxUpdateDepth) {
// CraftBukkit start - tree generation
if (this.captureTreeGeneration) {
+ // Paper start
+ BlockState type = getBlockState(pos);
+ if (!type.isDestroyable()) return false;
+ // Paper end
CraftBlockState blockstate = this.capturedBlockStates.get(pos);
if (blockstate == null) {
blockstate = CapturedBlockState.getTreeBlockState(this, pos, flags);
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index b77eda6af8b430311e502465a2590d83555ff6cf..a37213bce34f45898f56a22196b0d5ef1470e812 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -89,6 +89,19 @@ public class Block extends BlockBehaviour implements ItemLike {
protected final StateDefinition<Block, BlockState> stateDefinition;
private BlockState defaultBlockState;
// 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/world/level/block/piston/PistonBaseBlock.java b/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
index 2f1345d3c3671953a806cb243a152e080fbb9108..e9b315fb5a7b466e2ac65ae4ae69e893dd992739 100644
--- a/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
@@ -199,6 +199,12 @@ public class PistonBaseBlock extends DirectionalBlock {
@Override
public boolean triggerEvent(BlockState state, Level world, BlockPos pos, int type, int data) {
Direction enumdirection = (Direction) state.getValue(PistonBaseBlock.FACING);
+ // Paper start - prevent retracting when we're facing the wrong way (we were replaced before retraction could occur)
+ Direction directionQueuedAs = Direction.from3DDataValue(data & 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.getNeighborSignal(world, pos, enumdirection);
@@ -231,7 +237,7 @@ public class PistonBaseBlock extends DirectionalBlock {
BlockState iblockdata1 = (BlockState) ((BlockState) Blocks.MOVING_PISTON.defaultBlockState().setValue(MovingPistonBlock.FACING, enumdirection)).setValue(MovingPistonBlock.TYPE, this.isSticky ? PistonType.STICKY : PistonType.DEFAULT);
world.setBlock(pos, iblockdata1, 20);
- world.setBlockEntity(MovingPistonBlock.newMovingBlockEntity(pos, iblockdata1, (BlockState) this.defaultBlockState().setValue(PistonBaseBlock.FACING, Direction.from3DDataValue(data & 7)), enumdirection, false, true));
+ world.setBlockEntity(MovingPistonBlock.newMovingBlockEntity(pos, iblockdata1, (BlockState) this.defaultBlockState().setValue(PistonBaseBlock.FACING, Direction.from3DDataValue(data & 7)), enumdirection, false, true)); // Paper - diff on change
world.blockUpdated(pos, iblockdata1.getBlock());
iblockdata1.updateNeighbourShapes(world, pos, 2);
if (this.isSticky) {
@@ -260,7 +266,14 @@ public class PistonBaseBlock extends DirectionalBlock {
}
}
} else {
- world.removeBlock(pos.relative(enumdirection), false);
+ // Paper start - fix headless pistons breaking blocks
+ BlockPos headPos = pos.relative(enumdirection);
+ if (com.destroystokyo.paper.PaperConfig.allowBlockPermanentBreakingExploits || world.getBlockState(headPos) == Blocks.PISTON_HEAD.defaultBlockState().setValue(FACING, enumdirection)) { // double check to make sure we're not a headless piston.
+ world.removeBlock(headPos, false);
+ } else {
+ ((ServerLevel)world).getChunkSource().blockChanged(headPos); // ... fix client desync
+ }
+ // Paper end - fix headless pistons breaking blocks
}
world.playSound((Player) null, pos, SoundEvents.PISTON_CONTRACT, SoundSource.BLOCKS, 0.5F, world.random.nextFloat() * 0.15F + 0.6F);
diff --git a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
index 3c6b1b92fedf9986ebb835170c070ebd461f5d25..9055a82e9c91ecb8fc2ef5ac58db043ffb759168 100644
--- a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
+++ b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
@@ -223,7 +223,7 @@ public abstract class BlockBehaviour {
/** @deprecated */
@Deprecated
public boolean canBeReplaced(BlockState state, BlockPlaceContext context) {
- return this.material.isReplaceable() && (context.getItemInHand().isEmpty() || !context.getItemInHand().is(this.asItem()));
+ return this.material.isReplaceable() && (context.getItemInHand().isEmpty() || !context.getItemInHand().is(this.asItem())) && (state.isDestroyable() || (context.getPlayer() != null && context.getPlayer().getAbilities().instabuild)); // Paper
}
/** @deprecated */
@@ -705,7 +705,11 @@ public abstract class BlockBehaviour {
public Block getBlock() {
return (Block) this.owner;
}
-
+ // Paper start
+ public final boolean isDestroyable() {
+ return getBlock().isDestroyable();
+ }
+ // Paper end
public Material getMaterial() {
return this.material;
}
@@ -803,7 +807,7 @@ public abstract class BlockBehaviour {
}
public PushReaction getPistonPushReaction() {
- return this.getBlock().getPistonPushReaction(this.asState());
+ return !isDestroyable() ? PushReaction.BLOCK : this.getBlock().getPistonPushReaction(this.asState()); // Paper
}
public boolean isSolidRender(BlockGetter world, BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/level/portal/PortalForcer.java b/src/main/java/net/minecraft/world/level/portal/PortalForcer.java
index 05150fbade1d5a9b3b6de8ad1f5e825f34d1037e..ed79058696eb26a89b9d4116821840dbad9ea449 100644
--- a/src/main/java/net/minecraft/world/level/portal/PortalForcer.java
+++ b/src/main/java/net/minecraft/world/level/portal/PortalForcer.java
@@ -210,6 +210,13 @@ public class PortalForcer {
for (int j = -1; j < 3; ++j) {
for (int k = -1; k < 4; ++k) {
temp.setWithOffset(pos, portalDirection.getStepX() * j + enumdirection1.getStepX() * distanceOrthogonalToPortal, k, portalDirection.getStepZ() * j + enumdirection1.getStepZ() * distanceOrthogonalToPortal);
+ // Paper start - prevent destroying unbreakable blocks
+ if (!com.destroystokyo.paper.PaperConfig.allowBlockPermanentBreakingExploits) {
+ if (!this.level.getBlockState(temp).isDestroyable()) {
+ return false;
+ }
+ }
+ // Paper end - prevent destroying unbreakable blocks
if (k < 0 && !this.level.getBlockState(temp).getMaterial().isSolid()) {
return false;
}
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