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Add compression ratio limiter

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This commit is contained in:
Shane Freeder
2026-04-08 21:12:41 +01:00
parent f6d48c90f9
commit 9890c429c6
1 changed files with 6 additions and 0 deletions
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6
proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftCompressDecoder.java
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@@ -44,6 +44,7 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
Boolean.getBoolean("velocity.increased-compression-cap")
? HARD_MAXIMUM_UNCOMPRESSED_SIZE : SERVERBOUND_MAXIMUM_UNCOMPRESSED_SIZE;
private static final boolean SKIP_COMPRESSION_VALIDATION = Boolean.getBoolean("velocity.skip-uncompressed-packet-size-validation");
private static final double MAX_COMPRESSION_RATIO = Double.parseDouble(System.getProperty("velocity.max-compression-ratio", "10"));
private final ProtocolUtils.Direction direction;
private int threshold;
@@ -68,6 +69,7 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
out.add(in.retain());
return;
}
int length = in.readableBytes();
checkFrame(claimedUncompressedSize >= threshold, "Uncompressed size %s is less than"
+ " threshold %s", claimedUncompressedSize, threshold);
@@ -79,6 +81,10 @@ public class MinecraftCompressDecoder extends MessageToMessageDecoder<ByteBuf> {
checkFrame(claimedUncompressedSize <= SERVERBOUND_UNCOMPRESSED_CAP,
"Uncompressed size %s exceeds hard threshold of %s", claimedUncompressedSize,
SERVERBOUND_UNCOMPRESSED_CAP);
double maxCompressedAllowed = length * MAX_COMPRESSION_RATIO;
checkFrame(claimedUncompressedSize <= maxCompressedAllowed,
"Uncompressed size %s exceeds ratio threshold of %s for compressed sized %s", claimedUncompressedSize,
maxCompressedAllowed, length);
}
ByteBuf compatibleIn = ensureCompatible(ctx.alloc(), compressor, in);
ByteBuf uncompressed = preferredBuffer(ctx.alloc(), compressor, claimedUncompressedSize);