From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java @@ -0,0 +0,0 @@ public class PaperConfig { private static void midTickChunkTasks() { midTickChunkTasks = getInt("settings.chunk-tasks-per-tick", midTickChunkTasks); } + + public static boolean allowBlockPermanentBreakingExploits = false; + private static void allowBlockPermanentBreakingExploits() { + allowBlockPermanentBreakingExploits = getBoolean("allow-perm-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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/net/minecraft/server/Block.java +++ b/src/main/java/net/minecraft/server/Block.java @@ -0,0 +0,0 @@ public class Block implements IMaterial { protected final SoundEffectType stepSound; protected final Material material; // 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.MOVING_PISTON; // try to prevent creation of headless pistons + } public co.aikar.timings.Timing timing; public co.aikar.timings.Timing getTiming() { if (timing == null) { @@ -0,0 +0,0 @@ public class Block implements IMaterial { @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 @@ -0,0 +0,0 @@ public class Block implements IMaterial { @Deprecated public EnumPistonReaction getPushReaction(IBlockData iblockdata) { - return this.material.getPushReaction(); + return !blockData.isDestroyable() ? EnumPistonReaction.BLOCK : this.material.getPushReaction(); // Paper } public void fallOn(World world, BlockPosition blockposition, Entity entity, float f) { diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/net/minecraft/server/BlockPiston.java +++ b/src/main/java/net/minecraft/server/BlockPiston.java @@ -0,0 +0,0 @@ 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); @@ -0,0 +0,0 @@ public class BlockPiston extends BlockDirectional { } world.setTypeAndData(blockposition, (IBlockData) ((IBlockData) Blocks.MOVING_PISTON.getBlockData().set(BlockPistonMoving.a, enumdirection)).set(BlockPistonMoving.b, this.sticky ? BlockPropertyPistonType.STICKY : BlockPropertyPistonType.DEFAULT), 3); - 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 if (this.sticky) { BlockPosition blockposition1 = blockposition.b(enumdirection.getAdjacentX() * 2, enumdirection.getAdjacentY() * 2, enumdirection.getAdjacentZ() * 2); IBlockData iblockdata1 = world.getType(blockposition1); @@ -0,0 +0,0 @@ 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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/net/minecraft/server/Explosion.java +++ b/src/main/java/net/minecraft/server/Explosion.java @@ -0,0 +0,0 @@ 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 if (!iblockdata.isAir() || !fluid.isEmpty()) { @@ -0,0 +0,0 @@ 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/IBlockData.java b/src/main/java/net/minecraft/server/IBlockData.java index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/net/minecraft/server/IBlockData.java +++ b/src/main/java/net/minecraft/server/IBlockData.java @@ -0,0 +0,0 @@ public class IBlockData extends BlockDataAbstract implements return (CraftBlockData) cachedCraftBlockData.clone(); } // Paper end + // Paper start + public final boolean isDestroyable() { + return getBlock().isDestroyable(); + } + // Paper end public Material getMaterial() { return this.getBlock().k(this); diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644 --- a/src/main/java/net/minecraft/server/World.java +++ b/src/main/java/net/minecraft/server/World.java @@ -0,0 +0,0 @@ public abstract class World implements GeneratorAccess, AutoCloseable { public boolean setTypeAndData(BlockPosition blockposition, IBlockData iblockdata, int i) { // 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);