add pdata support, improve filesystem hooks

1 files changed, 130 insertions, 0 deletions

diff --git a/NorthstarDedicatedTest/serverauthentication.cpp b/NorthstarDedicatedTest/serverauthentication.cpp
new file mode 100644
index 00000000..5e27e9a5
--- /dev/null
+++ b/NorthstarDedicatedTest/serverauthentication.cpp
@@ -0,0 +1,130 @@
+#include "pch.h"
+#include "serverauthentication.h"
+#include "convar.h"
+#include "hookutils.h"
+#include <fstream>
+#include <filesystem>
+
+// hooks
+typedef void(*RejectClientType)(void* a1, const char* a2, void* player, const char* fmt, ...);
+RejectClientType RejectClient;
+
+typedef void*(*CBaseServer__ConnectClientType)(void* server, void* a2, void* a3, uint32_t a4, uint32_t a5, int32_t a6, void* a7, void* a8, char* serverFilter, void* a10, char a11, void* a12, char a13, char a14, void* a15, uint32_t a16, uint32_t a17);
+CBaseServer__ConnectClientType CBaseServer__ConnectClient;
+
+typedef char(*CBaseClient__ConnectType)(void* self, char* name, __int64 netchan_ptr_arg, char b_fake_player_arg, __int64 a5, char* Buffer, int a7);
+CBaseClient__ConnectType CBaseClient__Connect;
+
+// global vars
+ServerAuthenticationManager* g_ServerAuthenticationManager;
+
+ConVar* CVar_ns_auth_allow_insecure;
+ConVar* CVar_ns_auth_allow_insecure_write;
+
+ServerAuthenticationManager::ServerAuthenticationManager() : m_authData(std::unordered_map<std::string, AuthData*>())
+{}
+
+void ServerAuthenticationManager::AddPlayerAuth(char* authToken, char* uid, char* pdata, size_t pdataSize)
+{
+	
+}
+
+bool ServerAuthenticationManager::AuthenticatePlayer(__int64 player, char* authToken)
+{
+	// straight up just given up
+	if (!m_authData.empty() && m_authData.count(authToken))
+	{
+		// use stored auth data
+		AuthData* authData = m_authData[authToken];
+		
+		// uuid
+		strcpy((char*)player + 0xF500, authData->uid);
+
+		// copy pdata into buffer
+		memcpy((char*)player + 0x4FA, authData->pdata, authData->pdataSize);
+	}
+	else
+	{
+		if (!CVar_ns_auth_allow_insecure->m_nValue) // no auth data and insecure connections aren't allowed, so dc the client
+			return false;
+
+		spdlog::info("wtf");
+		spdlog::info(player);
+
+		// no auth data available and insecure connections are allowed, try reading from disk, using authtoken as uid
+		
+		// uuid
+		strcpy((char*)(player + 0xF500), authToken);
+
+		// try reading pdata file for player
+		std::string pdataPath = "playerdata/playerdata_";
+		pdataPath += authToken;
+		pdataPath += ".pdata";
+
+		std::fstream pdataStream(pdataPath, std::ios_base::in);
+		if (pdataStream.fail()) // file doesn't exist, use placeholder
+			pdataStream = std::fstream("playerdata/placeholder_playerdata.pdata");
+		
+		// get file length
+		pdataStream.seekg(0, pdataStream.end);
+		int length = pdataStream.tellg();
+		pdataStream.seekg(0, pdataStream.beg);
+
+		// copy pdata into buffer
+		
+
+		pdataStream.read((char*)(player + 0x4FA), length);
+	}
+
+	// set persistent data as ready
+	*(char*)(player + 0x4a0) = (char)0x3;
+
+	return true; // auth successful, client stays on
+}
+
+// store this in a var so we can use it in CBaseClient::Connect
+// this is fine because serverfilter ptr won't decay by the time we use this
+char* nextPlayerToken;
+
+void* CBaseServer__ConnectClientHook(void* server, void* a2, void* a3, uint32_t a4, uint32_t a5, int32_t a6, void* a7, void* a8, char* serverFilter, void* a10, char a11, void* a12, char a13, char a14, void* a15, uint32_t a16, uint32_t a17)
+{
+	// auth tokens are sent with serverfilter, can't be accessed from player struct to my knowledge, so have to do this here
+	nextPlayerToken = serverFilter;
+
+	return CBaseServer__ConnectClient(server, a2, a3, a4, a5, a6, a7, a8, serverFilter, a10, a11, a12, a13, a14, a15, a16, a17);
+}
+
+char CBaseClient__ConnectHook(void* self, char* name, __int64 netchan_ptr_arg, char b_fake_player_arg, __int64 a5, char* Buffer, int a7)
+{
+	if (!g_ServerAuthenticationManager->AuthenticatePlayer((__int64)self, nextPlayerToken))
+	{
+		//RejectClient(nullptr, "Authentication failed", self, "Authentication failed");
+		//return 0;
+	}
+
+	return CBaseClient__Connect(self, name, netchan_ptr_arg, b_fake_player_arg, a5, Buffer, a7);
+}
+
+void InitialiseServerAuthentication(HMODULE baseAddress)
+{
+	g_ServerAuthenticationManager = new ServerAuthenticationManager;
+
+	RejectClient = (RejectClientType)((char*)baseAddress + 0x1182E0);
+
+	CVar_ns_auth_allow_insecure = RegisterConVar("ns_auth_allow_insecure", "0", FCVAR_GAMEDLL, "Whether this server will allow unauthenicated players to connect");
+	CVar_ns_auth_allow_insecure_write = RegisterConVar("ns_auth_allow_insecure_write", "0", FCVAR_GAMEDLL, "Whether the pdata of unauthenticated clients will be written to disk when changed");
+
+	spdlog::info((void*)CVar_ns_auth_allow_insecure);
+	spdlog::info((void*)&CVar_ns_auth_allow_insecure->m_nValue);
+
+	HookEnabler hook;
+	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x114430, &CBaseServer__ConnectClientHook, reinterpret_cast<LPVOID*>(&CBaseServer__ConnectClient));
+	ENABLER_CREATEHOOK(hook, (char*)baseAddress + 0x101740, &CBaseClient__ConnectHook, reinterpret_cast<LPVOID*>(&CBaseClient__Connect));
+
+	// patch to disable kicking based on incorrect serverfilter in connectclient, since we repurpose it for use as an auth token
+	{
+		void* ptr = (char*)baseAddress + 0x114655;
+		TempReadWrite rw(ptr);
+		*((char*)ptr) = (char)0xEB; // jz => jmp
+	}
+}
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