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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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22
Minecraft.Client/Extrax64Stubs.cpp
View File

@@ -196,9 +196,29 @@ void IQNetPlayer::SendData(IQNetPlayer * player, const void* pvData, DWORD dwDat
{
if (!WinsockNetLayer::IsHosting() && !m_isRemote)
{
// Client sending to server via local socket (bypasses SendToSmallId)
SOCKET sock = WinsockNetLayer::GetLocalSocket(m_smallId);
if (sock != INVALID_SOCKET)
WinsockNetLayer::SendOnSocket(sock, pvData, dwDataSize);
{
// Encrypt if client send cipher is active
if (dwDataSize > 0)
{
std::vector<BYTE> buf(static_cast<const BYTE*>(pvData),
static_cast<const BYTE*>(pvData) + dwDataSize);
if (WinsockNetLayer::TryEncryptClientOutgoing(buf.data(), static_cast<int>(dwDataSize)))
{
WinsockNetLayer::SendOnSocket(sock, buf.data(), static_cast<int>(dwDataSize));
}
else
{
WinsockNetLayer::SendOnSocket(sock, pvData, dwDataSize);
}
}
else
{
WinsockNetLayer::SendOnSocket(sock, pvData, dwDataSize);
}
}
}
else
{