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feat: dedicated server security hardening

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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
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2
Minecraft.Server/Console/ServerCliEngine.cpp
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@@ -23,6 +23,7 @@
#include "commands\tp\CliCommandTp.h"
#include "commands\weather\CliCommandWeather.h"
#include "commands\whitelist\CliCommandWhitelist.h"
#include "commands\revoketoken\CliCommandRevokeToken.h"
#include "..\Common\StringUtils.h"
#include "..\ServerShutdown.h"
#include "..\ServerLogger.h"
@@ -100,6 +101,7 @@ namespace ServerRuntime
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandPardonIp()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandBanList()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandWhitelist()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandRevokeToken()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandTp()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandTime()));
m_registry->Register(std::unique_ptr<IServerCliCommand>(new CliCommandWeather()));