Mitigations and Detections
Does Sierra issue punishments (bans/kicks)?
Yes, we differentiate our actions into 3 types:
Mitigate is only there to report an alert and block the corresponding packet
Kick is used to interrupt a player's connection to prevent further crash attempts.
Ban is used when triggering a check that cannot be triggered by a vanilla player.
Book Validation
Before allowing interaction with a book, we first verify whether the book complies with the limits of the Minecraft client in all three phases. This includes the title, the author, and the pages. If these criteria are met, we permit interactions within a reasonable scope to ensure that misuse is prevented.
Protocol Validation
Our primary check is composed of a large collection of smaller checks, forming a comprehensive validation system. It serves as a repository for numerous minor algorithms designed to enforce compliance with various aspects of the Minecraft protocol. This check is deeply integrated into our three-phase action system, making it the most critical validation in our framework.
Command Validation
This check verifies incoming messages and commands for their structure, frequency, and content. In doing so, we block crash commands or those sent at a frequency that is harmful to various plugins.
Frequency
This check verifies the frequency of packets sent by the player. Regardless of whether they are sent at unusual intervals in a tick, suspended, or sent through various combinations. This check monitors the processes and kicks or mitigates them.
Movement Validation
This is our Movement Check. It monitors all types of player movements and ensures that no player moves inadvertently in a way that could harm the server.
Post Protocol
This check can be considered part of the Frequency Check. The Post Protocol Check examines whether clients exhibit various errors, as they often do not adhere to the Minecraft protocol due to their structure. This check determines if packets are sent incorrectly in combination with other packets and mitigates them accordingly.