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#3028: Add protocol level string length limits

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md_5 2021-01-25 15:54:27 +11:00
parent e95da11115
commit 3d701fbe0e
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2 changed files with 15 additions and 4 deletions
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17
protocol/src/main/java/net/md_5/bungee/protocol/DefinedPacket.java
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@ -32,17 +32,28 @@ public abstract class DefinedPacket
} }
public static String readString(ByteBuf buf) public static String readString(ByteBuf buf)
{
return readString( buf, Short.MAX_VALUE );
}
public static String readString(ByteBuf buf, int maxLen)
{ {
int len = readVarInt( buf ); int len = readVarInt( buf );
if ( len > Short.MAX_VALUE ) if ( len > maxLen * 4 )
{ {
throw new OverflowPacketException( String.format( "Cannot receive string longer than Short.MAX_VALUE (got %s characters)", len ) ); throw new OverflowPacketException( String.format( "Cannot receive string longer than %d (got %d bytes)", maxLen * 4, len ) );
} }
byte[] b = new byte[ len ]; byte[] b = new byte[ len ];
buf.readBytes( b ); buf.readBytes( b );
return new String( b, Charsets.UTF_8 ); String s = new String( b, Charsets.UTF_8 );
if ( s.length() > maxLen )
{
throw new OverflowPacketException( String.format( "Cannot receive string longer than %d (got %d characters)", maxLen, s.length() ) );
}
return s;
} }
public static void writeArray(byte[] b, ByteBuf buf) public static void writeArray(byte[] b, ByteBuf buf)

2
protocol/src/main/java/net/md_5/bungee/protocol/packet/LoginRequest.java
View File

@ -24,7 +24,7 @@ public class LoginRequest extends DefinedPacket
@Override @Override
public void read(ByteBuf buf) public void read(ByteBuf buf)
{ {
data = readString( buf ); data = readString( buf, 16 );
} }
@Override @Override