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 3ee7e5671dd2519cec72b81211f1f39176a228ba..cf9b9de8688e3f655631451409096d7ec0471910 100644 --- a/src/main/java/com/destroystokyo/paper/PaperConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java @@ -431,4 +431,10 @@ 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 e40375b67a4a321048c87002a07fde5c5d2395db..d2207a2c95690de586ab2d181b64955a6d2ea70d 100644 --- a/src/main/java/net/minecraft/server/Block.java +++ b/src/main/java/net/minecraft/server/Block.java @@ -32,6 +32,14 @@ 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) { @@ -276,7 +284,7 @@ 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 @@ -596,7 +604,7 @@ 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 b29525c40dc8e3ae747b8ddf5a3bd79b7cc0b792..39cd8ab5925ceb9494e0ac910c73338c24ecda2c 100644 --- a/src/main/java/net/minecraft/server/BlockPiston.java +++ b/src/main/java/net/minecraft/server/BlockPiston.java @@ -175,6 +175,12 @@ 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); @@ -204,7 +210,7 @@ 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); @@ -232,7 +238,14 @@ 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 a353f3d5fa5a5f54335f73584589de3f5cb20d3e..2552f860ff7a25f74e9a0600e58cefe064fac484 100644 --- a/src/main/java/net/minecraft/server/Explosion.java +++ b/src/main/java/net/minecraft/server/Explosion.java @@ -117,6 +117,7 @@ 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 if (!iblockdata.isAir() || !fluid.isEmpty()) { @@ -282,7 +283,7 @@ 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/IBlockData.java b/src/main/java/net/minecraft/server/IBlockData.java index b19bbbbc81376177751396a2de9452ce1f84c06b..296b41bf36ee1ace5bd9db2b810bf926b5f5278f 100644 --- a/src/main/java/net/minecraft/server/IBlockData.java +++ b/src/main/java/net/minecraft/server/IBlockData.java @@ -52,6 +52,11 @@ 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 7bd3f789b6055d73f3a6c0628652cca241147887..032b7acee8c8af70c0283f5551ce2875607f6c98 100644 --- a/src/main/java/net/minecraft/server/World.java +++ b/src/main/java/net/minecraft/server/World.java @@ -342,6 +342,10 @@ 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);