Change file name case sensitivity to lower case (#249)

To mirror how it is in refactor PR

1 files changed, 0 insertions, 553 deletions

diff --git a/NorthstarDLL/ExploitFixes.cpp b/NorthstarDLL/ExploitFixes.cpp
deleted file mode 100644
index 31fa349a..00000000
--- a/NorthstarDLL/ExploitFixes.cpp
+++ /dev/null
@@ -1,553 +0,0 @@
-#include "pch.h"
-
-#include "ExploitFixes.h"
-#include "ExploitFixes_UTF8Parser.h"
-#include "NSMem.h"
-#include "cvar.h"
-#include "gameutils.h"
-
-ConVar* ns_exploitfixes_log;
-#define SHOULD_LOG (ns_exploitfixes_log->m_Value.m_nValue > 0)
-#define BLOCKED_INFO(s)                                                                                                                    \
-	(                                                                                                                                      \
-		[=]() -> bool                                                                                                                      \
-		{                                                                                                                                  \
-			if (SHOULD_LOG)                                                                                                                \
-			{                                                                                                                              \
-				std::stringstream stream;                                                                                                  \
-				stream << "ExploitFixes.cpp: " << BLOCK_PREFIX << s;                                                                       \
-				spdlog::error(stream.str());                                                                                               \
-			}                                                                                                                              \
-			return false;                                                                                                                  \
-		}())
-
-struct Float3
-{
-	float vals[3];
-
-	void MakeValid()
-	{
-		for (auto& val : vals)
-			if (isnan(val))
-				val = 0;
-	}
-};
-
-#define BLOCK_NETMSG_FUNC(name, pattern)                                                                                                   \
-	KHOOK(name, ("engine.dll", pattern), bool, __fastcall, (void* thisptr, void* buffer))                                                  \
-	{                                                                                                                                      \
-		return false;                                                                                                                      \
-	}
-
-// Servers can literally request a screenshot from any client, yeah no
-BLOCK_NETMSG_FUNC(CLC_Screenshot_WriteToBuffer, "48 89 5C 24 ? 57 48 83 EC 20 8B 42 10");
-BLOCK_NETMSG_FUNC(CLC_Screenshot_ReadFromBuffer, "48 89 5C 24 ? 48 89 6C 24 ? 48 89 74 24 ? 57 48 83 EC 20 48 8B DA 48 8B 52 38");
-
-// This is unused ingame and a big exploit vector
-BLOCK_NETMSG_FUNC(Base_CmdKeyValues_ReadFromBuffer, "40 55 48 81 EC ? ? ? ? 48 8D 6C 24 ? 48 89 5D 70");
-
-KHOOK(CClient_ProcessSetConVar, ("engine.dll", "48 8B D1 48 8B 49 18 48 8B 01 48 FF 60 10"), bool, __fastcall, (void* pMsg))
-{
-
-	constexpr int ENTRY_STR_LEN = 260;
-	struct SetConVarEntry
-	{
-		char name[ENTRY_STR_LEN];
-		char val[ENTRY_STR_LEN];
-	};
-
-	struct NET_SetConVar
-	{
-		void* vtable;
-		void* unk1;
-		void* unk2;
-		void* m_pMessageHandler;
-		SetConVarEntry* m_ConVars; // convar entry array
-		void* unk5; // these 2 unks are just vector capacity or whatever
-		void* unk6;
-		int m_ConVars_count; // amount of cvar entries in array (this will not be out of bounds)
-	};
-
-	auto msg = (NET_SetConVar*)pMsg;
-
-	bool areWeServer;
-
-	{
-		// Figure out of we are the client or the server
-		//	To do this, we utilize the msg's m_pMessageHandler pointer
-		//	m_pMessageHandler points to a virtual class that handles all net messages
-		//	The first virtual table function of our m_pMessageHandler will differ if it is IServerMessageHandler or IClientMessageHandler
-		void* msgHandlerVTableFirstFunc = **(void****)(msg->m_pMessageHandler);
-		static auto engineBaseAddress = (uintptr_t)GetModuleHandleA("engine.dll");
-		auto offset = uintptr_t(msgHandlerVTableFirstFunc) - engineBaseAddress;
-
-		constexpr uintptr_t CLIENTSTATE_FIRST_VFUNC_OFFSET = 0x8A15C;
-		areWeServer = offset != CLIENTSTATE_FIRST_VFUNC_OFFSET;
-	}
-
-	std::string BLOCK_PREFIX = std::string {"NET_SetConVar ("} + (areWeServer ? "server" : "client") + "): Blocked dangerous/invalid msg: ";
-
-	if (areWeServer)
-	{
-		constexpr int SETCONVAR_SANITY_AMOUNT_LIMIT = 69;
-		if (msg->m_ConVars_count < 1 || msg->m_ConVars_count > SETCONVAR_SANITY_AMOUNT_LIMIT)
-		{
-			return BLOCKED_INFO("Invalid m_ConVars_count (" << msg->m_ConVars_count << ")");
-		}
-	}
-
-	for (int i = 0; i < msg->m_ConVars_count; i++)
-	{
-		auto entry = msg->m_ConVars + i;
-
-		// Safety check for memory access
-		if (NSMem::IsMemoryReadable(entry, sizeof(*entry)))
-		{
-
-			// Find null terminators
-			bool nameValid = false, valValid = false;
-			for (int i = 0; i < ENTRY_STR_LEN; i++)
-			{
-				if (!entry->name[i])
-					nameValid = true;
-				if (!entry->val[i])
-					valValid = true;
-			}
-
-			if (!nameValid || !valValid)
-				return BLOCKED_INFO("Missing null terminators");
-
-			auto realVar = g_pCVar->FindVar(entry->name);
-
-			if (realVar)
-				memcpy(
-					entry->name,
-					realVar->m_ConCommandBase.m_pszName,
-					strlen(realVar->m_ConCommandBase.m_pszName) + 1); // Force name to match case
-
-			bool isValidFlags = true;
-			if (areWeServer)
-			{
-				if (realVar)
-					isValidFlags = ConVar::IsFlagSet(realVar, FCVAR_USERINFO); // ConVar MUST be userinfo var
-			}
-			else
-			{
-				// TODO: Should probably have some sanity checks, but can't find any that are consistent
-			}
-
-			if (!isValidFlags)
-			{
-				if (!realVar)
-				{
-					return BLOCKED_INFO("Invalid flags on nonexistant cvar (how tho???)");
-				}
-				else
-				{
-					return BLOCKED_INFO(
-						"Invalid flags (" << std::hex << "0x" << realVar->m_ConCommandBase.m_nFlags << "), var is " << entry->name);
-				}
-			}
-		}
-		else
-		{
-			return BLOCKED_INFO("Unreadable memory at " << (void*)entry); // Not risking that one, they all gotta be readable
-		}
-	}
-
-	return oCClient_ProcessSetConVar(msg);
-}
-
-// Purpose: prevent invalid user CMDs
-KHOOK(CClient_ProcessUsercmds, ("engine.dll", "40 55 56 48 83 EC 58"), bool, __fastcall, (void* thisptr, void* pMsg))
-{
-	struct CLC_Move
-	{
-		BYTE gap0[24];
-		void* m_pMessageHandler;
-		int m_nBackupCommands;
-		int m_nNewCommands;
-		int m_nLength;
-		// bf_read m_DataIn;
-		// bf_write m_DataOut;
-	};
-
-	auto msg = (CLC_Move*)pMsg;
-
-	const char* BLOCK_PREFIX = "ProcessUserCmds: ";
-
-	if (msg->m_nBackupCommands < 0)
-	{
-		return BLOCKED_INFO("Invalid m_nBackupCommands (" << msg->m_nBackupCommands << ")");
-	}
-
-	if (msg->m_nNewCommands < 0)
-	{
-		return BLOCKED_INFO("Invalid m_nNewCommands (" << msg->m_nNewCommands << ")");
-	}
-
-	constexpr int NUMCMD_SANITY_LIMIT = 16;
-	if ((msg->m_nNewCommands + msg->m_nBackupCommands) > NUMCMD_SANITY_LIMIT)
-	{
-		return BLOCKED_INFO("Command count is too high (new: " << msg->m_nNewCommands << ", backup: " << msg->m_nBackupCommands << ")");
-	}
-
-	if (msg->m_nLength <= 0)
-		return BLOCKED_INFO("Invalid message length (" << msg->m_nLength << ")");
-
-	return oCClient_ProcessUsercmds(thisptr, pMsg);
-}
-
-KHOOK(ReadUsercmd, ("server.dll", "4C 89 44 24 ? 53 55 56 57"), void, __fastcall, (void* buf, void* pCmd_move, void* pCmd_from))
-{
-	// Let normal usercmd read happen first, it's safe
-	oReadUsercmd(buf, pCmd_move, pCmd_from);
-
-	// Now let's make sure the CMD we read isnt messed up to prevent numerous exploits (including server crashing)
-	struct alignas(4) SV_CUserCmd
-	{
-		DWORD command_number;
-		DWORD tick_count;
-		float command_time;
-		Float3 worldViewAngles;
-		BYTE gap18[4];
-		Float3 localViewAngles;
-		Float3 attackangles;
-		Float3 move;
-		DWORD buttons;
-		BYTE impulse;
-		short weaponselect;
-		DWORD meleetarget;
-		BYTE gap4C[24];
-		char headoffset;
-		BYTE gap65[11];
-		Float3 cameraPos;
-		Float3 cameraAngles;
-		BYTE gap88[4];
-		int tickSomething;
-		DWORD dword90;
-		DWORD predictedServerEventAck;
-		DWORD dword98;
-		float frameTime;
-	};
-
-	auto cmd = (SV_CUserCmd*)pCmd_move;
-	auto fromCmd = (SV_CUserCmd*)pCmd_from;
-
-	std::string BLOCK_PREFIX =
-		"ReadUsercmd (command_number delta: " + std::to_string(cmd->command_number - fromCmd->command_number) + "): ";
-
-	// Fix invalid player angles
-	cmd->worldViewAngles.MakeValid();
-	cmd->attackangles.MakeValid();
-	cmd->localViewAngles.MakeValid();
-
-	// Fix invalid camera angles
-	cmd->cameraPos.MakeValid();
-	cmd->cameraAngles.MakeValid();
-
-	// Fix invaid movement vector
-	cmd->move.MakeValid();
-
-	if (cmd->tick_count == 0 || cmd->command_time <= 0)
-	{
-		BLOCKED_INFO(
-			"Bogus cmd timing (tick_count: " << cmd->tick_count << ", frameTime: " << cmd->frameTime
-											 << ", commandTime : " << cmd->command_time << ")");
-		goto INVALID_CMD; // No simulation of bogus-timed cmds
-	}
-
-	return;
-
-INVALID_CMD:
-	// Fix any gameplay-affecting cmd properties
-	// NOTE: Currently tickcount/frametime is set to 0, this ~shouldn't~ cause any problems
-	cmd->worldViewAngles = cmd->localViewAngles = cmd->attackangles = cmd->cameraAngles = {0, 0, 0};
-	cmd->tick_count = cmd->frameTime = 0;
-	cmd->move = cmd->cameraPos = {0, 0, 0};
-	cmd->buttons = 0;
-	cmd->meleetarget = 0;
-}
-
-// basically: by default r2 isn't set as a valve mod, meaning that m_bRestrictServerCommands is false
-// this is HORRIBLE for security, because it means servers can run arbitrary concommands on clients
-// especially since we have script commands this could theoretically be awful
-KHOOK(IsValveMod, ("engine.dll", "48 83 EC 28 48 8B 0D ? ? ? ? 48 8D 15 ? ? ? ? E8 ? ? ? ? 85 C0 74 63"), bool, __fastcall, ())
-{
-	bool result = !CommandLine()->CheckParm("-norestrictservercommands");
-	spdlog::info("ExploitFixes: Overriding IsValveMod to {}...", result);
-	return result;
-}
-
-// Fix respawn's crappy UTF8 parser so it doesn't crash -_-
-// This also means you can launch multiplayer with "communities_enabled 1" and not crash, you're welcome
-KHOOK(
-	CrashFunc_ParseUTF8,
-	("engine.dll", "48 89 5C 24 ? 48 89 6C 24 ? 48 89 74 24 ? 57 41 54 41 55 41 56 41 57 48 83 EC 20 8B 1A"),
-	bool,
-	__fastcall,
-	(INT64 * a1, DWORD* a2, char* strData))
-{
-
-	static void* targetRetAddr = NSMem::PatternScan("engine.dll", "84 C0 75 2C 49 8B 16");
-
-#ifdef _MSC_VER
-	if (_ReturnAddress() == targetRetAddr)
-#else
-	if (__builtin_return_address(0) == targetRetAddr)
-#endif
-	{
-		if (!ExploitFixes_UTF8Parser::CheckValid(a1, a2, strData))
-		{
-			const char* BLOCK_PREFIX = "ParseUTF8 Hook: ";
-			BLOCKED_INFO("Ignoring potentially-crashing utf8 string");
-			return false;
-		}
-	}
-
-	return oCrashFunc_ParseUTF8(a1, a2, strData);
-}
-
-// GetEntByIndex (called by ScriptGetEntByIndex) doesn't check for the index being out of bounds when it's
-// above the max entity count. This allows it to be used to crash servers.
-typedef void*(__fastcall* GetEntByIndexType)(int idx);
-GetEntByIndexType GetEntByIndex;
-
-static void* GetEntByIndexHook(int idx)
-{
-	if (idx >= 0x4000)
-	{
-		spdlog::info("GetEntByIndex {} is out of bounds", idx);
-		return nullptr;
-	}
-	return GetEntByIndex(idx);
-}
-
-// RELOCATED FROM https://github.com/R2Northstar/NorthstarLauncher/commit/25dbf729cfc75107a0fcf0186924b58ecc05214b
-// Rewrite of CLZSS::SafeUncompress to fix a vulnerability where malicious compressed payloads could cause the decompressor to try to read
-// out of the bounds of the output buffer.
-KHOOK(
-	LZSS_SafeUncompress,
-	("engine.dll", "48 89 5C 24 ? 48 89 6C 24 ? 48 89 74 24 ? 48 89 7C 24 ? 33 ED 41 8B F9"),
-	uint32_t,
-	__fastcall,
-	(void* self, const unsigned char* pInput, unsigned char* pOutput, unsigned int unBufSize))
-{
-	static constexpr int LZSS_LOOKSHIFT = 4;
-
-	uint32_t totalBytes = 0;
-	int getCmdByte = 0, cmdByte = 0;
-
-	struct lzss_header_t
-	{
-		uint32_t id, actualSize;
-	};
-
-	lzss_header_t header = *(lzss_header_t*)pInput;
-
-	if (pInput == NULL || header.id != 'SSZL' || header.actualSize == 0 || header.actualSize > unBufSize)
-		return 0;
-
-	pInput += sizeof(lzss_header_t);
-
-	for (;;)
-	{
-		if (!getCmdByte)
-			cmdByte = *pInput++;
-
-		getCmdByte = (getCmdByte + 1) & 0x07;
-
-		if (cmdByte & 0x01)
-		{
-			int position = *pInput++ << LZSS_LOOKSHIFT;
-			position |= (*pInput >> LZSS_LOOKSHIFT);
-			position += 1;
-
-			int count = (*pInput++ & 0x0F) + 1;
-			if (count == 1)
-				break;
-
-			// Ensure reference chunk exists entirely within our buffer
-			if (position > totalBytes)
-				return 0;
-
-			totalBytes += count;
-			if (totalBytes > unBufSize)
-				return 0;
-
-			unsigned char* pSource = pOutput - position;
-			for (int i = 0; i < count; i++)
-				*pOutput++ = *pSource++;
-		}
-		else
-		{
-			totalBytes++;
-			if (totalBytes > unBufSize)
-				return 0;
-
-			*pOutput++ = *pInput++;
-		}
-		cmdByte = cmdByte >> 1;
-	}
-
-	if (totalBytes == header.actualSize)
-	{
-		return totalBytes;
-	}
-	else
-	{
-		return 0;
-	}
-}
-
-//////////////////////////////////////////////////
-
-void DoBytePatches()
-{
-	uintptr_t engineBase = (uintptr_t)GetModuleHandleA("engine.dll");
-	uintptr_t serverBase = (uintptr_t)GetModuleHandleA("server.dll");
-
-	// patches to make commands run from client/ui script still work
-	// note: this is likely preventable in a nicer way? test prolly
-	NSMem::BytePatch(engineBase + 0x4FB65, "EB 11");
-	NSMem::BytePatch(engineBase + 0x4FBAC, "EB 16");
-
-	// disconnect concommand
-	{
-		uintptr_t addr = engineBase + 0x5ADA2D;
-		int val = *(int*)addr | FCVAR_SERVER_CAN_EXECUTE;
-		NSMem::BytePatch(addr, (BYTE*)&val, sizeof(int));
-	}
-
-	{ // Dumb ANTITAMPER patches (they negatively impact performance and security)
-
-		constexpr const char* ANTITAMPER_EXPORTS[] = {
-			"ANTITAMPER_SPOTCHECK_CODEMARKER",
-			"ANTITAMPER_TESTVALUE_CODEMARKER",
-			"ANTITAMPER_TRIGGER_CODEMARKER",
-		};
-
-		// Prevent thesefrom actually doing anything
-		for (auto exportName : ANTITAMPER_EXPORTS)
-		{
-
-			auto address = (uintptr_t)GetProcAddress(GetModuleHandleA("server.dll"), exportName);
-			if (!address)
-			{
-				spdlog::warn("Failed to find AntiTamper function export \"{}\"", exportName);
-			}
-			else
-			{
-				// Just return, none of them have any args or are userpurge
-				NSMem::BytePatch(address, "C3");
-
-				spdlog::info("Patched AntiTamper function export \"{}\"", exportName);
-			}
-		}
-	}
-}
-
-KHOOK(
-	SpecialClientCommand,
-	("server.dll", "48 89 5C 24 ? 48 89 74 24 ? 55 57 41 56 48 8D 6C 24 ? 48 81 EC ? ? ? ? 83 3A 00"),
-	bool,
-	__fastcall,
-	(void* player, CCommand* command))
-{
-
-	static ConVar* sv_cheats = g_pCVar->FindVar("sv_cheats");
-
-	if (sv_cheats->GetBool())
-		return oSpecialClientCommand(player, command); // Don't block anything if sv_cheats is on
-
-	// These are mostly from Portal 2 (sigh)
-	constexpr const char* blockedCommands[] = {
-		"emit", // Sound-playing exploit (likely for Portal 2 coop devs testing splitscreen sound or something)
-
-		// These both execute a command for every single entity for some reason, nice one valve
-		"pre_go_to_hub",
-		"pre_go_to_calibration",
-
-		"end_movie", // Calls "__MovieFinished" script function, not sure exactly what this does but it certainly isn't needed
-		"load_recent_checkpoint" // This is the instant-respawn exploit, literally just calls RespawnPlayer()
-	};
-
-	if (command->ArgC() > 0)
-	{
-		std::string cmdStr = command->Arg(0);
-		for (char& c : cmdStr)
-			c = tolower(c);
-
-		for (const char* blockedCommand : blockedCommands)
-		{
-			if (cmdStr.find(blockedCommand) != std::string::npos)
-			{
-				// Block this command
-				spdlog::warn("Blocked exploititive client command \"{}\".", cmdStr);
-				return true;
-			}
-		}
-	}
-
-	return oSpecialClientCommand(player, command);
-}
-
-void SetupKHook(KHook* hook)
-{
-	if (hook->Setup())
-	{
-		spdlog::debug("KHook::Setup(): Hooked at {}", hook->targetFuncAddr);
-	}
-	else
-	{
-		spdlog::critical("\tFAILED to initialize all exploit patches.");
-
-		// Force exit
-		MessageBoxA(0, "FAILED to initialize all exploit patches.", "Northstar", MB_ICONERROR);
-		exit(0);
-	}
-}
-
-void ExploitFixes::LoadCallback_MultiModule(HMODULE baseAddress)
-{
-
-	spdlog::info("ExploitFixes::LoadCallback_MultiModule({}) ...", (void*)baseAddress);
-
-	int hooksEnabled = 0;
-	for (auto itr = KHook::_allHooks.begin(); itr != KHook::_allHooks.end(); itr++)
-	{
-		auto curHook = *itr;
-		if (GetModuleHandleA(curHook->targetFunc.moduleName) == baseAddress)
-		{
-			SetupKHook(curHook);
-			itr = KHook::_allHooks.erase(itr); // Prevent repeated initialization
-
-			hooksEnabled++;
-
-			if (itr == KHook::_allHooks.end())
-				break;
-		}
-	}
-
-	spdlog::info("\tEnabled {} hooks.", hooksEnabled);
-}
-
-void ExploitFixes::LoadCallback_Full(HMODULE baseAddress)
-{
-	spdlog::info("ExploitFixes::LoadCallback_Full ...");
-
-	spdlog::info("\tByte patching...");
-	DoBytePatches();
-
-	for (KHook* hook : KHook::_allHooks)
-		SetupKHook(hook);
-
-	spdlog::info("\tInitialized " + std::to_string(KHook::_allHooks.size()) + " late exploit-patch hooks.");
-	KHook::_allHooks.clear();
-
-	ns_exploitfixes_log =
-		new ConVar("ns_exploitfixes_log", "1", FCVAR_GAMEDLL, "Whether to log whenever ExploitFixes.cpp blocks/corrects something");
-
-	HookEnabler hook;
-	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x2a8a50, &GetEntByIndexHook, reinterpret_cast<LPVOID*>(&GetEntByIndex));
-}