Unused payload properties can increase overall parsing of the messages

[shuse2]

Description

Currently lisk framework, and lisk p2p checks the size of the message and the validity of the used message. However, unused payloads were not strictly checked to reject them to provide the flexibility on the custom modules. However, the unused payloads can increase the parsing of the message even within the message size.

Expected behavior

While receiving the message through network, it should check if there are additional contents.
If a peer sends message with additional content, the peer should be banned, and not accept further connection or message.

Actual behavior

Currently, there are no additional contents check

Steps to reproduce

Send the p2p message which is not specified in the schema.

Which version(s) does this affect? (Environment, OS, etc...)

2.1-