1 files changed, 0 insertions, 218 deletions
diff --git a/NorthstarDLL/server/servernethooks.cpp b/NorthstarDLL/server/servernethooks.cpp
deleted file mode 100644
index 148b735f..00000000
--- a/NorthstarDLL/server/servernethooks.cpp
+++ /dev/null
@@ -1,218 +0,0 @@
-#include "core/convar/convar.h"
-#include "engine/r2engine.h"
-#include "shared/exploit_fixes/ns_limits.h"
-#include "masterserver/masterserver.h"
-
-#include <string>
-#include <thread>
-#include <bcrypt.h>
-
-AUTOHOOK_INIT()
-
-static ConVar* Cvar_net_debug_atlas_packet;
-static ConVar* Cvar_net_debug_atlas_packet_insecure;
-
-static BCRYPT_ALG_HANDLE HMACSHA256;
-constexpr size_t HMACSHA256_LEN = 256 / 8;
-
-static bool InitHMACSHA256()
-{
-	NTSTATUS status;
-	DWORD hashLength = 0;
-	ULONG hashLengthSz = 0;
-
-	if ((status = BCryptOpenAlgorithmProvider(&HMACSHA256, BCRYPT_SHA256_ALGORITHM, NULL, BCRYPT_ALG_HANDLE_HMAC_FLAG)))
-	{
-		spdlog::error("failed to initialize HMAC-SHA256: BCryptOpenAlgorithmProvider: error 0x{:08X}", (ULONG)status);
-		return false;
-	}
-
-	if ((status = BCryptGetProperty(HMACSHA256, BCRYPT_HASH_LENGTH, (PUCHAR)&hashLength, sizeof(hashLength), &hashLengthSz, 0)))
-	{
-		spdlog::error("failed to initialize HMAC-SHA256: BCryptGetProperty(BCRYPT_HASH_LENGTH): error 0x{:08X}", (ULONG)status);
-		return false;
-	}
-
-	if (hashLength != HMACSHA256_LEN)
-	{
-		spdlog::error("failed to initialize HMAC-SHA256: BCryptGetProperty(BCRYPT_HASH_LENGTH): unexpected value {}", hashLength);
-		return false;
-	}
-
-	return true;
-}
-
-// compare the HMAC-SHA256(data, key) against sig (note: all strings are treated as raw binary data)
-static bool VerifyHMACSHA256(std::string key, std::string sig, std::string data)
-{
-	uint8_t invalid = 1;
-	char hash[HMACSHA256_LEN];
-
-	NTSTATUS status;
-	BCRYPT_HASH_HANDLE h = NULL;
-
-	if ((status = BCryptCreateHash(HMACSHA256, &h, NULL, 0, (PUCHAR)key.c_str(), (ULONG)key.length(), 0)))
-	{
-		spdlog::error("failed to verify HMAC-SHA256: BCryptCreateHash: error 0x{:08X}", (ULONG)status);
-		goto cleanup;
-	}
-
-	if ((status = BCryptHashData(h, (PUCHAR)data.c_str(), (ULONG)data.length(), 0)))
-	{
-		spdlog::error("failed to verify HMAC-SHA256: BCryptHashData: error 0x{:08X}", (ULONG)status);
-		goto cleanup;
-	}
-
-	if ((status = BCryptFinishHash(h, (PUCHAR)&hash, (ULONG)sizeof(hash), 0)))
-	{
-		spdlog::error("failed to verify HMAC-SHA256: BCryptFinishHash: error 0x{:08X}", (ULONG)status);
-		goto cleanup;
-	}
-
-	// constant-time compare
-	if (sig.length() == sizeof(hash))
-	{
-		invalid = 0;
-		for (size_t i = 0; i < sizeof(hash); i++)
-			invalid |= (uint8_t)(sig[i]) ^ (uint8_t)(hash[i]);
-	}
-
-cleanup:
-	if (h)
-		BCryptDestroyHash(h);
-	return !invalid;
-}
-
-// v1 HMACSHA256-signed masterserver request (HMAC-SHA256(JSONData, MasterServerToken) + JSONData)
-static void ProcessAtlasConnectionlessPacketSigreq1(netpacket_t* packet, bool dbg, std::string pType, std::string pData)
-{
-	if (pData.length() < HMACSHA256_LEN)
-	{
-		if (dbg)
-			spdlog::warn("ignoring Atlas connectionless packet (size={} type={}): invalid: too short for signature", packet->size, pType);
-		return;
-	}
-
-	std::string pSig; // is binary data, not actually an ASCII string
-	pSig = pData.substr(0, HMACSHA256_LEN);
-	pData = pData.substr(HMACSHA256_LEN);
-
-	if (!g_pMasterServerManager || !g_pMasterServerManager->m_sOwnServerAuthToken[0])
-	{
-		if (dbg)
-			spdlog::warn(
-				"ignoring Atlas connectionless packet (size={} type={}): invalid (data={}): no masterserver token yet",
-				packet->size,
-				pType,
-				pData);
-		return;
-	}
-
-	if (!VerifyHMACSHA256(std::string(g_pMasterServerManager->m_sOwnServerAuthToken), pSig, pData))
-	{
-		if (!Cvar_net_debug_atlas_packet_insecure->GetBool())
-		{
-			if (dbg)
-				spdlog::warn(
-					"ignoring Atlas connectionless packet (size={} type={}): invalid: invalid signature (key={})",
-					packet->size,
-					pType,
-					std::string(g_pMasterServerManager->m_sOwnServerAuthToken));
-			return;
-		}
-		spdlog::warn(
-			"processing Atlas connectionless packet (size={} type={}) with invalid signature due to net_debug_atlas_packet_insecure",
-			packet->size,
-			pType);
-	}
-
-	if (dbg)
-		spdlog::info("got Atlas connectionless packet (size={} type={} data={})", packet->size, pType, pData);
-
-	std::thread t(&MasterServerManager::ProcessConnectionlessPacketSigreq1, g_pMasterServerManager, pData);
-	t.detach();
-
-	return;
-}
-
-static void ProcessAtlasConnectionlessPacket(netpacket_t* packet)
-{
-	bool dbg = Cvar_net_debug_atlas_packet->GetBool();
-
-	// extract kind, null-terminated type, data
-	std::string pType, pData;
-	for (int i = 5; i < packet->size; i++)
-	{
-		if (packet->data[i] == '\x00')
-		{
-			pType.assign((char*)(&packet->data[5]), (size_t)(i - 5));
-			if (i + 1 < packet->size)
-				pData.assign((char*)(&packet->data[i + 1]), (size_t)(packet->size - i - 1));
-			break;
-		}
-	}
-
-	// note: all Atlas connectionless packets should be idempotent so multiple attempts can be made to mitigate packet loss
-	// note: all long-running Atlas connectionless packet handlers should be started in a new thread (with copies of the data) to avoid
-	// blocking networking
-
-	// v1 HMACSHA256-signed masterserver request
-	if (pType == "sigreq1")
-	{
-		ProcessAtlasConnectionlessPacketSigreq1(packet, dbg, pType, pData);
-		return;
-	}
-
-	if (dbg)
-		spdlog::warn("ignoring Atlas connectionless packet (size={} type={}): unknown type", packet->size, pType);
-	return;
-}
-
-AUTOHOOK(ProcessConnectionlessPacket, engine.dll + 0x117800, bool, , (void* a1, netpacket_t* packet))
-{
-	// packet->data consists of 0xFFFFFFFF (int32 -1) to indicate packets aren't split, followed by a header consisting of a single
-	// character, which is used to uniquely identify the packet kind. Most kinds follow this with a null-terminated string payload
-	// then an arbitrary amoount of data.
-
-	// T (no rate limits since we authenticate packets before doing anything expensive)
-	if (4 < packet->size && packet->data[4] == 'T')
-	{
-		ProcessAtlasConnectionlessPacket(packet);
-		return false;
-	}
-
-	// check rate limits for the original unconnected packets
-	if (!g_pServerLimits->CheckConnectionlessPacketLimits(packet))
-		return false;
-
-	// A, H, I, N
-	return ProcessConnectionlessPacket(a1, packet);
-}
-
-ON_DLL_LOAD_RELIESON("engine.dll", ServerNetHooks, ConVar, (CModule module))
-{
-	AUTOHOOK_DISPATCH_MODULE(engine.dll)
-
-	if (!InitHMACSHA256())
-		throw std::runtime_error("failed to initialize bcrypt");
-
-	if (!VerifyHMACSHA256(
-			"test",
-			"\x88\xcd\x21\x08\xb5\x34\x7d\x97\x3c\xf3\x9c\xdf\x90\x53\xd7\xdd\x42\x70\x48\x76\xd8\xc9\xa9\xbd\x8e\x2d\x16\x82\x59\xd3\xdd"
-			"\xf7",
-			"test"))
-		throw std::runtime_error("bcrypt HMAC-SHA256 is broken");
-
-	Cvar_net_debug_atlas_packet = new ConVar(
-		"net_debug_atlas_packet",
-		"0",
-		FCVAR_NONE,
-		"Whether to log detailed debugging information for Atlas connectionless packets (warning: this allows unlimited amounts of "
-		"arbitrary data to be logged)");
-
-	Cvar_net_debug_atlas_packet_insecure = new ConVar(
-		"net_debug_atlas_packet_insecure",
-		"0",
-		FCVAR_NONE,
-		"Whether to disable signature verification for Atlas connectionless packets (DANGEROUS: this allows anyone to impersonate Atlas)");
-}