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PaperMC/patches/server/0733-Use-Velocity-compression-and-cipher-natives.patch
sandtechnology 28b4027d45
Fix packet duplicating at some points (#8566) 
Due to the weakly consistent of ConcurrentLinkedQueue iterator, at some points, packet will be resent twice times or more, causing some weird behaviors (e.g. kicked for illegal movement since the same ClientboundPlayerPositionPacket was sent two times). This changes for the patch add a flag for marking if the packet was consumed to prevent such issue and ensure consistently of the packet queue.
2022-11-27 10:36:35 -06:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Mon, 26 Jul 2021 02:15:17 -0400
Subject: [PATCH] Use Velocity compression and cipher natives
diff --git a/build.gradle.kts b/build.gradle.kts
index 2d1e639bd2880469d849ca1242184b0af1f6903c..88000dae363f55044f86e72e9f6fb0214cd320bc 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -27,6 +27,11 @@ dependencies {
implementation("org.spongepowered:configurate-yaml:4.1.2") // Paper - config files
implementation("commons-lang:commons-lang:2.6")
implementation("net.fabricmc:mapping-io:0.3.0") // Paper - needed to read mappings for stacktrace deobfuscation
+ // Paper start - Use Velocity cipher
+ implementation("com.velocitypowered:velocity-native:3.1.2-SNAPSHOT") {
+ isTransitive = false
+ }
+ // Paper end
runtimeOnly("org.xerial:sqlite-jdbc:3.36.0.3")
runtimeOnly("mysql:mysql-connector-java:8.0.29")
runtimeOnly("com.lmax:disruptor:3.4.4") // Paper
diff --git a/src/main/java/net/minecraft/network/CipherDecoder.java b/src/main/java/net/minecraft/network/CipherDecoder.java
index 778beb445eac5769b9e4e07b4d1294c50ae2602b..c712fb8193115e1ab71b5e40fb0ccb9413062b03 100644
--- a/src/main/java/net/minecraft/network/CipherDecoder.java
+++ b/src/main/java/net/minecraft/network/CipherDecoder.java
@@ -7,13 +7,29 @@ import java.util.List;
import javax.crypto.Cipher;
public class CipherDecoder extends MessageToMessageDecoder<ByteBuf> {
- private final CipherBase cipher;
+ private final com.velocitypowered.natives.encryption.VelocityCipher cipher; // Paper
- public CipherDecoder(Cipher cipher) {
- this.cipher = new CipherBase(cipher);
+ public CipherDecoder(com.velocitypowered.natives.encryption.VelocityCipher cipher) { // Paper
+ this.cipher = cipher; // Paper
}
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) throws Exception {
- list.add(this.cipher.decipher(channelHandlerContext, byteBuf));
+ // Paper start
+ ByteBuf compatible = com.velocitypowered.natives.util.MoreByteBufUtils.ensureCompatible(channelHandlerContext.alloc(), cipher, byteBuf);
+ try {
+ cipher.process(compatible);
+ list.add(compatible);
+ } catch (Exception e) {
+ compatible.release(); // compatible will never be used if we throw an exception
+ throw e;
+ }
+ // Paper end
}
+
+ // Paper start
+ @Override
+ public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
+ cipher.close();
+ }
+ // Paper end
}
diff --git a/src/main/java/net/minecraft/network/CipherEncoder.java b/src/main/java/net/minecraft/network/CipherEncoder.java
index 0f3d502a9680006bcdcd7d272240a2e5c3b46790..5dd7be70603e8754d2625bb9d16900cb01b9c730 100644
--- a/src/main/java/net/minecraft/network/CipherEncoder.java
+++ b/src/main/java/net/minecraft/network/CipherEncoder.java
@@ -4,15 +4,32 @@ import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import javax.crypto.Cipher;
+import java.util.List;
-public class CipherEncoder extends MessageToByteEncoder<ByteBuf> {
- private final CipherBase cipher;
+public class CipherEncoder extends io.netty.handler.codec.MessageToMessageEncoder<ByteBuf> { // Paper - change superclass
+ private final com.velocitypowered.natives.encryption.VelocityCipher cipher; // Paper
- public CipherEncoder(Cipher cipher) {
- this.cipher = new CipherBase(cipher);
+ public CipherEncoder(com.velocitypowered.natives.encryption.VelocityCipher cipher) { // Paper
+ this.cipher = cipher; // Paper
}
- protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, ByteBuf byteBuf2) throws Exception {
- this.cipher.encipher(byteBuf, byteBuf2);
+ protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) throws Exception {
+ // Paper start
+ ByteBuf compatible = com.velocitypowered.natives.util.MoreByteBufUtils.ensureCompatible(channelHandlerContext.alloc(), cipher, byteBuf);
+ try {
+ cipher.process(compatible);
+ list.add(compatible);
+ } catch (Exception e) {
+ compatible.release(); // compatible will never be used if we throw an exception
+ throw e;
+ }
+ // Paper end
}
+
+ // Paper start
+ @Override
+ public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
+ cipher.close();
+ }
+ // Paper end
}
diff --git a/src/main/java/net/minecraft/network/CompressionDecoder.java b/src/main/java/net/minecraft/network/CompressionDecoder.java
index b62be99c57b0a5bba0dc29809557d4d247698b13..f4d4ad983baf24d889441541d5a84dc1f49ea4d4 100644
--- a/src/main/java/net/minecraft/network/CompressionDecoder.java
+++ b/src/main/java/net/minecraft/network/CompressionDecoder.java
@@ -12,13 +12,20 @@ public class CompressionDecoder extends ByteToMessageDecoder {
public static final int MAXIMUM_COMPRESSED_LENGTH = 2097152;
public static final int MAXIMUM_UNCOMPRESSED_LENGTH = 8388608;
private final Inflater inflater;
+ private final com.velocitypowered.natives.compression.VelocityCompressor compressor; // Paper
private int threshold;
private boolean validateDecompressed;
+ // Paper start
public CompressionDecoder(int compressionThreshold, boolean rejectsBadPackets) {
+ this(null, compressionThreshold, rejectsBadPackets);
+ }
+ public CompressionDecoder(com.velocitypowered.natives.compression.VelocityCompressor compressor, int compressionThreshold, boolean rejectsBadPackets) {
this.threshold = compressionThreshold;
this.validateDecompressed = rejectsBadPackets;
- this.inflater = new Inflater();
+ this.inflater = compressor == null ? new Inflater() : null;
+ this.compressor = compressor;
+ // Paper end
}
protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) throws Exception {
@@ -38,6 +45,8 @@ public class CompressionDecoder extends ByteToMessageDecoder {
}
}
+ // Paper start
+ if (this.inflater != null) {
byte[] bs = new byte[friendlyByteBuf.readableBytes()];
friendlyByteBuf.readBytes(bs);
this.inflater.setInput(bs);
@@ -45,10 +54,36 @@ public class CompressionDecoder extends ByteToMessageDecoder {
this.inflater.inflate(cs);
list.add(Unpooled.wrappedBuffer(cs));
this.inflater.reset();
+ return;
+ }
+
+ int claimedUncompressedSize = i; // OBFHELPER
+ ByteBuf compatibleIn = com.velocitypowered.natives.util.MoreByteBufUtils.ensureCompatible(channelHandlerContext.alloc(), this.compressor, byteBuf);
+ ByteBuf uncompressed = com.velocitypowered.natives.util.MoreByteBufUtils.preferredBuffer(channelHandlerContext.alloc(), this.compressor, claimedUncompressedSize);
+ try {
+ this.compressor.inflate(compatibleIn, uncompressed, claimedUncompressedSize);
+ list.add(uncompressed);
+ byteBuf.clear();
+ } catch (Exception e) {
+ uncompressed.release();
+ throw e;
+ } finally {
+ compatibleIn.release();
+ }
+ // Paper end
}
}
}
+ // Paper start
+ @Override
+ public void handlerRemoved0(ChannelHandlerContext ctx) throws Exception {
+ if (this.compressor != null) {
+ this.compressor.close();
+ }
+ }
+ // Paper end
+
public void setThreshold(int compressionThreshold, boolean rejectsBadPackets) {
this.threshold = compressionThreshold;
this.validateDecompressed = rejectsBadPackets;
diff --git a/src/main/java/net/minecraft/network/CompressionEncoder.java b/src/main/java/net/minecraft/network/CompressionEncoder.java
index 792883afe53d2b7989c25a81c2f9a639d5e21d20..c04379ca8a4db0f4de46ad2b3b3384310eebddf3 100644
--- a/src/main/java/net/minecraft/network/CompressionEncoder.java
+++ b/src/main/java/net/minecraft/network/CompressionEncoder.java
@@ -6,22 +6,37 @@ import io.netty.handler.codec.MessageToByteEncoder;
import java.util.zip.Deflater;
public class CompressionEncoder extends MessageToByteEncoder<ByteBuf> {
- private final byte[] encodeBuf = new byte[8192];
+ private final byte[] encodeBuf; // Paper
private final Deflater deflater;
+ private final com.velocitypowered.natives.compression.VelocityCompressor compressor; // Paper
private int threshold;
+ // Paper start
public CompressionEncoder(int compressionThreshold) {
+ this(null, compressionThreshold);
+ }
+ public CompressionEncoder(com.velocitypowered.natives.compression.VelocityCompressor compressor, int compressionThreshold) {
this.threshold = compressionThreshold;
- this.deflater = new Deflater();
+ if (compressor == null) {
+ this.encodeBuf = new byte[8192];
+ this.deflater = new Deflater();
+ } else {
+ this.encodeBuf = null;
+ this.deflater = null;
+ }
+ this.compressor = compressor;
+ // Paper end
}
- protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, ByteBuf byteBuf2) {
+ protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, ByteBuf byteBuf2) throws Exception { // Paper
int i = byteBuf.readableBytes();
FriendlyByteBuf friendlyByteBuf = new FriendlyByteBuf(byteBuf2);
if (i < this.threshold) {
friendlyByteBuf.writeVarInt(0);
friendlyByteBuf.writeBytes(byteBuf);
} else {
+ // Paper start
+ if (this.deflater != null) {
byte[] bs = new byte[i];
byteBuf.readBytes(bs);
friendlyByteBuf.writeVarInt(bs.length);
@@ -34,10 +49,48 @@ public class CompressionEncoder extends MessageToByteEncoder<ByteBuf> {
}
this.deflater.reset();
+ return;
+ }
+
+ friendlyByteBuf.writeVarInt(i);
+ ByteBuf compatibleIn = com.velocitypowered.natives.util.MoreByteBufUtils.ensureCompatible(channelHandlerContext.alloc(), this.compressor, byteBuf);
+ try {
+ this.compressor.deflate(compatibleIn, byteBuf2);
+ } finally {
+ compatibleIn.release();
+ }
+ // Paper end
}
}
+ // Paper start
+ @Override
+ protected ByteBuf allocateBuffer(ChannelHandlerContext ctx, ByteBuf msg, boolean preferDirect) throws Exception{
+ if (this.compressor != null) {
+ // We allocate bytes to be compressed plus 1 byte. This covers two cases:
+ //
+ // - Compression
+ // According to https://github.com/ebiggers/libdeflate/blob/master/libdeflate.h#L103,
+ // if the data compresses well (and we do not have some pathological case) then the maximum
+ // size the compressed size will ever be is the input size minus one.
+ // - Uncompressed
+ // This is fairly obvious - we will then have one more than the uncompressed size.
+ int initialBufferSize = msg.readableBytes() + 1;
+ return com.velocitypowered.natives.util.MoreByteBufUtils.preferredBuffer(ctx.alloc(), this.compressor, initialBufferSize);
+ }
+
+ return super.allocateBuffer(ctx, msg, preferDirect);
+ }
+
+ @Override
+ public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
+ if (this.compressor != null) {
+ this.compressor.close();
+ }
+ }
+ // Paper end
+
public int getThreshold() {
return this.threshold;
}
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index 2bc49ccf7eb2f1f3f956da365340e958dbb076a7..f1e1a4a48349c0e431b31327fdf217989db027b3 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -690,11 +690,28 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
return networkmanager;
}
- public void setEncryptionKey(Cipher decryptionCipher, Cipher encryptionCipher) {
- this.encrypted = true;
- this.channel.pipeline().addBefore("splitter", "decrypt", new CipherDecoder(decryptionCipher));
- this.channel.pipeline().addBefore("prepender", "encrypt", new CipherEncoder(encryptionCipher));
+ // Paper start
+// public void setEncryptionKey(Cipher decryptionCipher, Cipher encryptionCipher) {
+// this.encrypted = true;
+// this.channel.pipeline().addBefore("splitter", "decrypt", new CipherDecoder(decryptionCipher));
+// this.channel.pipeline().addBefore("prepender", "encrypt", new CipherEncoder(encryptionCipher));
+// }
+
+ public void setupEncryption(javax.crypto.SecretKey key) throws net.minecraft.util.CryptException {
+ if (!this.encrypted) {
+ try {
+ com.velocitypowered.natives.encryption.VelocityCipher decryption = com.velocitypowered.natives.util.Natives.cipher.get().forDecryption(key);
+ com.velocitypowered.natives.encryption.VelocityCipher encryption = com.velocitypowered.natives.util.Natives.cipher.get().forEncryption(key);
+
+ this.encrypted = true;
+ this.channel.pipeline().addBefore("splitter", "decrypt", new CipherDecoder(decryption));
+ this.channel.pipeline().addBefore("prepender", "encrypt", new CipherEncoder(encryption));
+ } catch (java.security.GeneralSecurityException e) {
+ throw new net.minecraft.util.CryptException(e);
+ }
+ }
}
+ // Paper end
public boolean isEncrypted() {
return this.encrypted;
@@ -723,16 +740,17 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
public void setupCompression(int compressionThreshold, boolean rejectsBadPackets) {
if (compressionThreshold >= 0) {
+ com.velocitypowered.natives.compression.VelocityCompressor compressor = com.velocitypowered.natives.util.Natives.compress.get().create(-1); // Paper
if (this.channel.pipeline().get("decompress") instanceof CompressionDecoder) {
((CompressionDecoder) this.channel.pipeline().get("decompress")).setThreshold(compressionThreshold, rejectsBadPackets);
} else {
- this.channel.pipeline().addBefore("decoder", "decompress", new CompressionDecoder(compressionThreshold, rejectsBadPackets));
+ this.channel.pipeline().addBefore("decoder", "decompress", new CompressionDecoder(compressor, compressionThreshold, rejectsBadPackets)); // Paper
}
if (this.channel.pipeline().get("compress") instanceof CompressionEncoder) {
((CompressionEncoder) this.channel.pipeline().get("compress")).setThreshold(compressionThreshold);
} else {
- this.channel.pipeline().addBefore("encoder", "compress", new CompressionEncoder(compressionThreshold));
+ this.channel.pipeline().addBefore("encoder", "compress", new CompressionEncoder(compressor, compressionThreshold)); // Paper
}
this.channel.pipeline().fireUserEventTriggered(io.papermc.paper.network.ConnectionEvent.COMPRESSION_THRESHOLD_SET); // Paper
} else {
diff --git a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
index b80aedd2002959b4026c27ce76b3ed17f0acfb5b..2985271132c9ae822dcb0d7a7e6f0c268d1736cc 100644
--- a/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
+++ b/src/main/java/net/minecraft/server/network/ServerConnectionListener.java
@@ -106,6 +106,11 @@ public class ServerConnectionListener {
ServerConnectionListener.LOGGER.info("Using default channel type");
}
+ // Paper start - indicate Velocity natives in use
+ ServerConnectionListener.LOGGER.info("Paper: Using " + com.velocitypowered.natives.util.Natives.compress.getLoadedVariant() + " compression from Velocity.");
+ ServerConnectionListener.LOGGER.info("Paper: Using " + com.velocitypowered.natives.util.Natives.cipher.getLoadedVariant() + " cipher from Velocity.");
+ // Paper end
+
this.channels.add(((ServerBootstrap) ((ServerBootstrap) (new ServerBootstrap()).channel(oclass)).childHandler(new ChannelInitializer<Channel>() {
protected void initChannel(Channel channel) {
try {
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index fa469313d4b38bd9441b3010743e1054420bd525..7d7d7336eea6db6505b57198cca2b03960fb1ec0 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -304,12 +304,14 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
}
SecretKey secretkey = packet.getSecretKey(privatekey);
- Cipher cipher = Crypt.getCipher(2, secretkey);
- Cipher cipher1 = Crypt.getCipher(1, secretkey);
+ // Paper start
+// Cipher cipher = Crypt.getCipher(2, secretkey);
+// Cipher cipher1 = Crypt.getCipher(1, secretkey);
+ // Paper end
s = (new BigInteger(Crypt.digestData("", this.server.getKeyPair().getPublic(), secretkey))).toString(16);
this.state = ServerLoginPacketListenerImpl.State.AUTHENTICATING;
- this.connection.setEncryptionKey(cipher, cipher1);
+ this.connection.setupEncryption(secretkey); // Paper
} catch (CryptException cryptographyexception) {
throw new IllegalStateException("Protocol error", cryptographyexception);
}
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