feat: dedicated server security hardening

Comprehensive security system to protect against packet-sniffing attacks,
XUID harvesting, privilege escalation, bot flooding, and XUID impersonation.

- Stream cipher: per-session XOR cipher with 4-message handshake via
  CustomPayloadPacket (MC|CKey, MC|CAck, MC|COn). Negotiated per-connection,
  backwards compatible (old clients/servers fall back to plaintext).
- Security gate: buffers all game data until cipher handshake completes,
  preventing unsecured clients from receiving any XUIDs or game state.
- Cipher handshake enforcer: kicks clients that don't complete the handshake
  within 5 seconds (configurable via require-secure-client).
- Identity tokens: persistent per-XUID tokens in identity-tokens.json,
  issued over the encrypted channel, verified on reconnect. Prevents XUID
  replay attacks. Client stores server-specific tokens.
- PROXY protocol v1: parses real client IPs from playit.gg tunnel headers
  so rate limiting, IP bans, and XUID spoof detection work per-player.
- Rate limiting: per-IP sliding window (default 5 connections/30s) with
  pending connection cap (default 10).
- Privilege hardening: OP requires ops.json, live checks on every command
  and privilege packet. Host-only server settings changes.
- XUID stripping: PreLoginPacket response sends INVALID_XUID placeholders.
- Packet validation: readUtf global string cap, reduced max packet size,
  stream desync protection on oversized strings.
- OpManager: persistent ops.json with XUID-based OP list.
- Whitelist improvements: whitelist add accepts player names with ambiguity
  detection, XUID cache from login attempts.
- revoketoken command: revoke identity tokens for players who lost theirs.
- server.log: persistent log file written alongside console output with
  flush-per-write to survive crashes.
- CLI security logging: consolidated per-join security summary with cipher
  status, token status, XUID, and real IP. Security warnings for kicks,
  spoofing, and unauthorized commands.

This commit is contained in:

itsRevela

2026-03-28 19:18:06 -05:00

parent ed3fffcc6a

commit ba3ebe666c

42 changed files with 3293 additions and 34 deletions

									
										Minecraft.Client/cmake/sources/Common.cmake
									
		+2
		
												View File
												
				@@ -410,6 +410,8 @@ source_group("Windows64/Iggy/gdraw" FILES ${_MINECRAFT_CLIENT_COMMON_WINDOWS64_I

				set(_MINECRAFT_CLIENT_COMMON_WINDOWS64_NETWORK

				  "${CMAKE_CURRENT_SOURCE_DIR}/Windows64/Network/WinsockNetLayer.cpp"

				  "${CMAKE_CURRENT_SOURCE_DIR}/Windows64/Network/WinsockNetLayer.h"

				  "${CMAKE_CURRENT_SOURCE_DIR}/../Minecraft.Server/Security/StreamCipher.cpp"

				  "${CMAKE_CURRENT_SOURCE_DIR}/../Minecraft.Server/Security/StreamCipher.h"

				)

				source_group("Windows64/Network" FILES ${_MINECRAFT_CLIENT_COMMON_WINDOWS64_NETWORK})