Adjust folder structure (#242)

* Adjust folder structure

* change launcher directory name

1 files changed, 755 insertions, 0 deletions

diff --git a/NorthstarDLL/serverauthentication.cpp b/NorthstarDLL/serverauthentication.cpp
new file mode 100644
index 00000000..ac1985cf
--- /dev/null
+++ b/NorthstarDLL/serverauthentication.cpp
@@ -0,0 +1,755 @@
+#include "pch.h"
+#include "serverauthentication.h"
+#include "cvar.h"
+#include "convar.h"
+#include "hookutils.h"
+#include "masterserver.h"
+#include "httplib.h"
+#include "gameutils.h"
+#include "bansystem.h"
+#include "miscserverscript.h"
+#include "concommand.h"
+#include "dedicated.h"
+#include <fstream>
+#include <filesystem>
+#include <thread>
+#include "configurables.h"
+#include "NSMem.h"
+
+const char* AUTHSERVER_VERIFY_STRING = "I am a northstar server!";
+
+// This convar defines whether to log all client commands
+ConVar* Cvar_ns_should_log_all_clientcommands;
+
+// hook types
+
+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,
+	int64_t uid,
+	uint32_t a16,
+	uint32_t a17);
+CBaseServer__ConnectClientType CBaseServer__ConnectClient;
+
+typedef bool (*CBaseClient__ConnectType)(
+	void* self, char* name, __int64 netchan_ptr_arg, char b_fake_player_arg, __int64 a5, char* Buffer, void* a7);
+CBaseClient__ConnectType CBaseClient__Connect;
+
+typedef void (*CBaseClient__ActivatePlayerType)(void* self);
+CBaseClient__ActivatePlayerType CBaseClient__ActivatePlayer;
+
+CBaseClient__DisconnectType CBaseClient__Disconnect;
+
+typedef char (*CGameClient__ExecuteStringCommandType)(void* self, uint32_t unknown, const char* pCommandString);
+CGameClient__ExecuteStringCommandType CGameClient__ExecuteStringCommand;
+
+typedef char (*__fastcall CNetChan___ProcessMessagesType)(void* self, void* buf);
+CNetChan___ProcessMessagesType CNetChan___ProcessMessages;
+
+typedef char (*CBaseClient__SendServerInfoType)(void* self);
+CBaseClient__SendServerInfoType CBaseClient__SendServerInfo;
+
+typedef bool (*ProcessConnectionlessPacketType)(void* a1, netpacket_t* packet);
+ProcessConnectionlessPacketType ProcessConnectionlessPacket;
+
+typedef void (*CServerGameDLL__OnReceivedSayTextMessageType)(void* self, unsigned int senderClientIndex, const char* message, char unknown);
+CServerGameDLL__OnReceivedSayTextMessageType CServerGameDLL__OnReceivedSayTextMessage;
+
+typedef void (*ConCommand__DispatchType)(ConCommand* command, const CCommand& args, void* a3);
+ConCommand__DispatchType ConCommand__Dispatch;
+
+// global vars
+ServerAuthenticationManager* g_ServerAuthenticationManager;
+
+ConVar* Cvar_ns_player_auth_port;
+ConVar* Cvar_ns_erase_auth_info;
+ConVar* CVar_ns_auth_allow_insecure;
+ConVar* CVar_ns_auth_allow_insecure_write;
+ConVar* CVar_sv_quota_stringcmdspersecond;
+ConVar* Cvar_net_chan_limit_mode;
+ConVar* Cvar_net_chan_limit_msec_per_sec;
+ConVar* Cvar_sv_querylimit_per_sec;
+ConVar* Cvar_sv_max_chat_messages_per_sec;
+
+ConVar* Cvar_net_datablock_enabled;
+
+void ServerAuthenticationManager::StartPlayerAuthServer()
+{
+	if (m_runningPlayerAuthThread)
+	{
+		spdlog::warn("ServerAuthenticationManager::StartPlayerAuthServer was called while m_runningPlayerAuthThread is true");
+		return;
+	}
+
+	m_runningPlayerAuthThread = true;
+
+	// listen is a blocking call so thread this
+	std::thread serverThread(
+		[this]
+		{
+			// this is just a super basic way to verify that servers have ports open, masterserver will try to read this before ensuring
+			// server is legit
+			m_playerAuthServer.Get(
+				"/verify",
+				[](const httplib::Request& request, httplib::Response& response)
+				{ response.set_content(AUTHSERVER_VERIFY_STRING, "text/plain"); });
+
+			m_playerAuthServer.Post(
+				"/authenticate_incoming_player",
+				[this](const httplib::Request& request, httplib::Response& response)
+				{
+					// can't just do request.remote_addr == Cvar_ns_masterserver_hostname->GetString() because the cvar can be a url, gotta
+					// resolve an ip from it for comparisons
+					// unsigned long remoteAddr = inet_addr(request.remote_addr.c_str());
+					//
+					// char* addrPtr = Cvar_ns_masterserver_hostname->GetString();
+					// char* typeStart = strstr(addrPtr, "://");
+					// if (typeStart)
+					//	addrPtr = typeStart + 3;
+					// hostent* resolvedRemoteAddr = gethostbyname((const char*)addrPtr);
+
+					if (!request.has_param("id") || !request.has_param("authToken") || request.body.size() >= 65335 ||
+						!request.has_param("serverAuthToken") ||
+						strcmp(
+							g_MasterServerManager->m_ownServerAuthToken,
+							request.get_param_value("serverAuthToken")
+								.c_str())) // || !resolvedRemoteAddr || ((in_addr**)resolvedRemoteAddr->h_addr_list)[0]->S_un.S_addr !=
+										   // remoteAddr)
+					{
+						response.set_content("{\"success\":false}", "application/json");
+						return;
+					}
+
+					// Log playername and UID from request
+					spdlog::info(
+						"Player \"{}\" with UID \"{}\" requested to join",
+						request.get_param_value("username").c_str(),
+						request.get_param_value("id").c_str());
+
+					AuthData newAuthData {};
+					strncpy(newAuthData.uid, request.get_param_value("id").c_str(), sizeof(newAuthData.uid));
+					newAuthData.uid[sizeof(newAuthData.uid) - 1] = 0;
+
+					strncpy(newAuthData.username, request.get_param_value("username").c_str(), sizeof(newAuthData.username));
+					newAuthData.username[sizeof(newAuthData.username) - 1] = 0;
+
+					newAuthData.pdataSize = request.body.size();
+					newAuthData.pdata = new char[newAuthData.pdataSize];
+					memcpy(newAuthData.pdata, request.body.c_str(), newAuthData.pdataSize);
+
+					std::lock_guard<std::mutex> guard(m_authDataMutex);
+					m_authData.insert(std::make_pair(request.get_param_value("authToken"), newAuthData));
+
+					response.set_content("{\"success\":true}", "application/json");
+				});
+
+			m_playerAuthServer.listen("0.0.0.0", Cvar_ns_player_auth_port->GetInt());
+		});
+
+	serverThread.detach();
+}
+
+void ServerAuthenticationManager::StopPlayerAuthServer()
+{
+	if (!m_runningPlayerAuthThread)
+	{
+		spdlog::warn("ServerAuthenticationManager::StopPlayerAuthServer was called while m_runningPlayerAuthThread is false");
+		return;
+	}
+
+	m_runningPlayerAuthThread = false;
+	m_playerAuthServer.stop();
+}
+
+char* ServerAuthenticationManager::VerifyPlayerName(void* player, char* authToken, char* name)
+{
+	std::lock_guard<std::mutex> guard(m_authDataMutex);
+
+	if (!m_authData.empty() && m_authData.count(std::string(authToken)))
+	{
+		AuthData authData = m_authData[authToken];
+
+		bool nameAccepted = (!*authData.username || !strcmp(name, authData.username));
+
+		if (!nameAccepted && g_MasterServerManager->m_bRequireClientAuth && !CVar_ns_auth_allow_insecure->GetInt())
+		{
+			// limit name length to 64 characters just in case something changes, this technically shouldn't be needed given the master
+			// server gets usernames from origin but we have it just in case
+			strncpy(name, authData.username, 64);
+			name[63] = 0;
+		}
+	}
+	return name;
+}
+
+bool ServerAuthenticationManager::AuthenticatePlayer(void* player, int64_t uid, char* authToken)
+{
+	std::string strUid = std::to_string(uid);
+	std::lock_guard<std::mutex> guard(m_authDataMutex);
+
+	bool authFail = true;
+	if (!m_authData.empty() && m_authData.count(std::string(authToken)))
+	{
+		// use stored auth data
+		AuthData authData = m_authData[authToken];
+
+		// Log playnername and UID from request
+		spdlog::info("Comparing connecting UID \"{}\" against stored UID from ms auth request \"{}\"", strUid.c_str(), authData.uid);
+
+		if (!strcmp(strUid.c_str(), authData.uid)) // connecting client's uid is the same as auth's uid
+		{
+			authFail = false;
+			// uuid
+			strcpy((char*)player + 0xF500, strUid.c_str());
+
+			// reset from disk if we're doing that
+			if (m_bForceReadLocalPlayerPersistenceFromDisk && !strcmp(authData.uid, g_LocalPlayerUserID))
+			{
+				std::fstream pdataStream(GetNorthstarPrefix() + "/placeholder_playerdata.pdata", std::ios_base::in);
+
+				if (!pdataStream.fail())
+				{
+					// get file length
+					pdataStream.seekg(0, pdataStream.end);
+					auto length = pdataStream.tellg();
+					pdataStream.seekg(0, pdataStream.beg);
+
+					// copy pdata into buffer
+					pdataStream.read((char*)player + 0x4FA, length);
+				}
+				else // fallback to remote pdata if no local default
+					memcpy((char*)player + 0x4FA, authData.pdata, authData.pdataSize);
+			}
+			else
+			{
+				// copy pdata into buffer
+				memcpy((char*)player + 0x4FA, authData.pdata, authData.pdataSize);
+			}
+
+			// set persistent data as ready, we use 0x4 internally to mark the client as using remote persistence
+			*((char*)player + 0x4a0) = (char)0x4;
+		}
+	}
+
+	if (authFail)
+	{
+		// set persistent data as ready, we use 0x3 internally to mark the client as using local persistence
+		*((char*)player + 0x4a0) = (char)0x3;
+
+		// no auth data and insecure connections aren't allowed, so dc the client
+		if (!CVar_ns_auth_allow_insecure->GetBool() && strncmp(GetCurrentPlaylistName(), "solo", 5) != 0)
+			return false;
+
+		// insecure connections are allowed, try reading from disk
+		// uuid
+		strcpy((char*)player + 0xF500, strUid.c_str());
+
+		// try reading pdata file for player
+		std::string pdataPath = GetNorthstarPrefix() + "/playerdata_";
+		pdataPath += strUid;
+		pdataPath += ".pdata";
+
+		std::fstream pdataStream(pdataPath, std::ios_base::in);
+		if (pdataStream.fail()) // file doesn't exist, use placeholder
+			pdataStream = std::fstream(GetNorthstarPrefix() + "/placeholder_playerdata.pdata", std::ios_base::in);
+
+		// get file length
+		pdataStream.seekg(0, pdataStream.end);
+		auto length = pdataStream.tellg();
+		pdataStream.seekg(0, pdataStream.beg);
+
+		// copy pdata into buffer
+		pdataStream.read((char*)player + 0x4FA, length);
+
+		pdataStream.close();
+	}
+
+	return true; // auth successful, client stays on
+}
+
+bool ServerAuthenticationManager::RemovePlayerAuthData(void* player)
+{
+	if (!Cvar_ns_erase_auth_info->GetBool())
+		return false;
+
+	// hack for special case where we're on a local server, so we erase our own newly created auth data on disconnect
+	if (m_bNeedLocalAuthForNewgame && !strcmp((char*)player + 0xF500, g_LocalPlayerUserID))
+		return false;
+
+	// we don't have our auth token at this point, so lookup authdata by uid
+	for (auto& auth : m_authData)
+	{
+		if (!strcmp((char*)player + 0xF500, auth.second.uid))
+		{
+			// Log UID
+			spdlog::info("Erasing auth data from UID \"{}\"", auth.second.uid);
+			// pretty sure this is fine, since we don't iterate after the erase
+			// i think if we iterated after it'd be undefined behaviour tho
+			std::lock_guard<std::mutex> guard(m_authDataMutex);
+
+			delete[] auth.second.pdata;
+			m_authData.erase(auth.first);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void ServerAuthenticationManager::WritePersistentData(void* player)
+{
+	// we use 0x4 internally to mark clients as using remote persistence
+	if (*((char*)player + 0x4A0) == (char)0x4)
+	{
+		g_MasterServerManager->WritePlayerPersistentData(
+			(char*)player + 0xF500, (char*)player + 0x4FA, m_additionalPlayerData[player].pdataSize);
+	}
+	else if (CVar_ns_auth_allow_insecure_write->GetBool())
+	{
+		// todo: write pdata to disk here
+	}
+}
+
+bool ServerAuthenticationManager::CheckPlayerChatRatelimit(void* player)
+{
+	if (Plat_FloatTime() - m_additionalPlayerData[player].lastSayTextLimitStart >= 1.0)
+	{
+		m_additionalPlayerData[player].lastSayTextLimitStart = Plat_FloatTime();
+		m_additionalPlayerData[player].sayTextLimitCount = 0;
+	}
+
+	if (m_additionalPlayerData[player].sayTextLimitCount >= Cvar_sv_max_chat_messages_per_sec->GetInt())
+		return false;
+
+	m_additionalPlayerData[player].sayTextLimitCount++;
+	return true;
+}
+
+// auth hooks
+
+// store these in vars so we can use them in CBaseClient::Connect
+// this is fine because ptrs won't decay by the time we use this, just don't use it outside of cbaseclient::connect
+char* nextPlayerToken;
+uint64_t nextPlayerUid;
+
+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,
+	int64_t uid,
+	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;
+	nextPlayerUid = uid;
+
+	// Random UID log
+	spdlog::info("CBaseServer__ConnectClientHook says UID \"{}\"", uid);
+
+	return CBaseServer__ConnectClient(server, a2, a3, a4, a5, a6, a7, a8, serverFilter, a10, a11, a12, a13, a14, uid, a16, a17);
+}
+
+bool CBaseClient__ConnectHook(void* self, char* name, __int64 netchan_ptr_arg, char b_fake_player_arg, __int64 a5, char* Buffer, void* a7)
+{
+	// try changing name before all else
+	name = g_ServerAuthenticationManager->VerifyPlayerName(self, nextPlayerToken, name);
+
+	// try to auth player, dc if it fails
+	// we connect irregardless of auth, because returning bad from this function can fuck client state p bad
+	bool ret = CBaseClient__Connect(self, name, netchan_ptr_arg, b_fake_player_arg, a5, Buffer, a7);
+
+	// Another UID log
+	spdlog::info("CBaseClient__ConnectHook says UID \"{}\"", nextPlayerUid);
+
+	if (!ret)
+		return ret;
+
+	if (!g_ServerBanSystem->IsUIDAllowed(nextPlayerUid))
+	{
+		CBaseClient__Disconnect(self, 1, "Banned from server");
+		return ret;
+	}
+
+	if (strlen(name) >= 64) // fix for name overflow bug
+		CBaseClient__Disconnect(self, 1, "Invalid name");
+	else if (
+		!g_ServerAuthenticationManager->AuthenticatePlayer(self, nextPlayerUid, nextPlayerToken) &&
+		g_MasterServerManager->m_bRequireClientAuth)
+		CBaseClient__Disconnect(self, 1, "Authentication Failed");
+
+	if (!g_ServerAuthenticationManager->m_additionalPlayerData.count(self))
+	{
+		AdditionalPlayerData additionalData;
+		additionalData.pdataSize = g_ServerAuthenticationManager->m_authData[nextPlayerToken].pdataSize;
+		additionalData.usingLocalPdata = *((char*)self + 0x4a0) == (char)0x3;
+
+		g_ServerAuthenticationManager->m_additionalPlayerData.insert(std::make_pair(self, additionalData));
+
+		g_ServerAuthenticationManager->m_additionalPlayerData[self].uid = nextPlayerUid;
+	}
+
+	return ret;
+}
+
+void CBaseClient__ActivatePlayerHook(void* self)
+{
+	bool uidMatches = false;
+	if (g_ServerAuthenticationManager->m_additionalPlayerData.count(self))
+	{
+		std::string strUid = std::to_string(g_ServerAuthenticationManager->m_additionalPlayerData[self].uid);
+		if (!strcmp(strUid.c_str(), (char*)self + 0xF500)) // connecting client's uid is the same as auth's uid
+		{
+			uidMatches = true;
+		}
+	}
+	if (!uidMatches)
+	{
+		CBaseClient__Disconnect(self, 1, "Authentication Failed");
+		return;
+	}
+
+	// if we're authed, write our persistent data
+	// RemovePlayerAuthData returns true if it removed successfully, i.e. on first call only, and we only want to write on >= second call
+	// (since this func is called on map loads)
+	if (*((char*)self + 0x4A0) >= (char)0x3 && !g_ServerAuthenticationManager->RemovePlayerAuthData(self))
+	{
+		g_ServerAuthenticationManager->m_bForceReadLocalPlayerPersistenceFromDisk = false;
+		g_ServerAuthenticationManager->WritePersistentData(self);
+		g_MasterServerManager->UpdateServerPlayerCount(g_ServerAuthenticationManager->m_additionalPlayerData.size());
+	}
+	// Log UID
+	spdlog::info("In CBaseClient__ActivatePlayerHook, activating UID \"{}\"", (char*)self + 0xF500);
+
+	CBaseClient__ActivatePlayer(self);
+}
+
+void CBaseClient__DisconnectHook(void* self, uint32_t unknownButAlways1, const char* reason, ...)
+{
+	// have to manually format message because can't pass varargs to original func
+	char buf[1024];
+
+	va_list va;
+	va_start(va, reason);
+	vsprintf(buf, reason, va);
+	va_end(va);
+
+	// this reason is used while connecting to a local server, hacky, but just ignore it
+	if (strcmp(reason, "Connection closing"))
+	{
+		spdlog::info("Player {} disconnected: \"{}\"", (char*)self + 0x16, buf);
+
+		// dcing, write persistent data
+		if (g_ServerAuthenticationManager->m_additionalPlayerData[self].needPersistenceWriteOnLeave)
+			g_ServerAuthenticationManager->WritePersistentData(self);
+		g_ServerAuthenticationManager->RemovePlayerAuthData(self); // won't do anything 99% of the time, but just in case
+	}
+
+	if (g_ServerAuthenticationManager->m_additionalPlayerData.count(self))
+	{
+		g_ServerAuthenticationManager->m_additionalPlayerData.erase(self);
+		g_MasterServerManager->UpdateServerPlayerCount(g_ServerAuthenticationManager->m_additionalPlayerData.size());
+	}
+
+	CBaseClient__Disconnect(self, unknownButAlways1, buf);
+}
+
+// maybe this should be done outside of auth code, but effort to refactor rn and it sorta fits
+typedef bool (*CCommand__TokenizeType)(CCommand& self, const char* pCommandString, cmd_source_t commandSource);
+CCommand__TokenizeType CCommand__Tokenize;
+
+char CGameClient__ExecuteStringCommandHook(void* self, uint32_t unknown, const char* pCommandString)
+{
+	// Only log clientcommands if the convar `ns_should_log_all_clientcommands` equals 1
+	if (Cvar_ns_should_log_all_clientcommands->GetBool())
+	{
+		spdlog::info("{} (UID: {}) executed command: \"{}\"", (char*)self + 0x16, (char*)self + 0xF500, pCommandString);
+	}
+
+	if (CVar_sv_quota_stringcmdspersecond->GetInt() != -1)
+	{
+		// note: this isn't super perfect, legit clients can trigger it in lobby, mostly good enough tho imo
+		// https://github.com/perilouswithadollarsign/cstrike15_src/blob/f82112a2388b841d72cb62ca48ab1846dfcc11c8/engine/sv_client.cpp#L1513
+		if (Plat_FloatTime() - g_ServerAuthenticationManager->m_additionalPlayerData[self].lastClientCommandQuotaStart >= 1.0)
+		{
+			// reset quota
+			g_ServerAuthenticationManager->m_additionalPlayerData[self].lastClientCommandQuotaStart = Plat_FloatTime();
+			g_ServerAuthenticationManager->m_additionalPlayerData[self].numClientCommandsInQuota = 0;
+		}
+
+		g_ServerAuthenticationManager->m_additionalPlayerData[self].numClientCommandsInQuota++;
+		if (g_ServerAuthenticationManager->m_additionalPlayerData[self].numClientCommandsInQuota >
+			CVar_sv_quota_stringcmdspersecond->GetInt())
+		{
+			// too many stringcmds, dc player
+			CBaseClient__Disconnect(self, 1, "Sent too many stringcmd commands");
+			return false;
+		}
+	}
+
+	// verify the command we're trying to execute is FCVAR_CLIENTCMD_CAN_EXECUTE, if it's a concommand
+	char* commandBuf[1040]; // assumedly this is the size of CCommand since we don't have an actual constructor
+	memset(commandBuf, 0, sizeof(commandBuf));
+	CCommand tempCommand = *(CCommand*)&commandBuf;
+
+	if (!CCommand__Tokenize(tempCommand, pCommandString, cmd_source_t::kCommandSrcCode) || !tempCommand.ArgC())
+		return false;
+
+	ConCommand* command = g_pCVar->FindCommand(tempCommand.Arg(0));
+
+	// if the command doesn't exist pass it on to ExecuteStringCommand for script clientcommands and stuff
+	if (command && !command->IsFlagSet(FCVAR_CLIENTCMD_CAN_EXECUTE))
+	{
+		// ensure FCVAR_GAMEDLL concommands without FCVAR_CLIENTCMD_CAN_EXECUTE can't be executed by remote clients
+		if (IsDedicated())
+			return false;
+
+		if (strcmp((char*)self + 0xF500, g_LocalPlayerUserID))
+			return false;
+	}
+
+	// todo later, basically just limit to CVar_sv_quota_stringcmdspersecond->GetInt() stringcmds per client per second
+	return CGameClient__ExecuteStringCommand(self, unknown, pCommandString);
+}
+
+char __fastcall CNetChan___ProcessMessagesHook(void* self, void* buf)
+{
+	double startTime = Plat_FloatTime();
+	char ret = CNetChan___ProcessMessages(self, buf);
+
+	// check processing limits, unless we're in a level transition
+	if (g_pHostState->m_iCurrentState == HostState_t::HS_RUN && ThreadInServerFrameThread())
+	{
+		// player that sent the message
+		void* sender = *(void**)((char*)self + 368);
+
+		// if no sender, return
+		// relatively certain this is fine?
+		if (!sender || !g_ServerAuthenticationManager->m_additionalPlayerData.count(sender))
+			return ret;
+
+		// reset every second
+		if (startTime - g_ServerAuthenticationManager->m_additionalPlayerData[sender].lastNetChanProcessingLimitStart >= 1.0 ||
+			g_ServerAuthenticationManager->m_additionalPlayerData[sender].lastNetChanProcessingLimitStart == -1.0)
+		{
+			g_ServerAuthenticationManager->m_additionalPlayerData[sender].lastNetChanProcessingLimitStart = startTime;
+			g_ServerAuthenticationManager->m_additionalPlayerData[sender].netChanProcessingLimitTime = 0.0;
+		}
+		g_ServerAuthenticationManager->m_additionalPlayerData[sender].netChanProcessingLimitTime +=
+			(Plat_FloatTime() * 1000) - (startTime * 1000);
+
+		if (g_ServerAuthenticationManager->m_additionalPlayerData[sender].netChanProcessingLimitTime >=
+			Cvar_net_chan_limit_msec_per_sec->GetInt())
+		{
+			spdlog::warn(
+				"Client {} hit netchan processing limit with {}ms of processing time this second (max is {})",
+				(char*)sender + 0x16,
+				g_ServerAuthenticationManager->m_additionalPlayerData[sender].netChanProcessingLimitTime,
+				Cvar_net_chan_limit_msec_per_sec->GetInt());
+
+			// nonzero = kick, 0 = warn, but never kick local player
+			if (Cvar_net_chan_limit_mode->GetInt() && strcmp(g_LocalPlayerUserID, (char*)sender + 0xF500))
+			{
+				CBaseClient__Disconnect(sender, 1, "Exceeded net channel processing limit");
+				return false;
+			}
+		}
+	}
+
+	return ret;
+}
+
+bool bWasWritingStringTableSuccessful;
+
+void CBaseClient__SendServerInfoHook(void* self)
+{
+	bWasWritingStringTableSuccessful = true;
+	CBaseClient__SendServerInfo(self);
+	if (!bWasWritingStringTableSuccessful)
+		CBaseClient__Disconnect(
+			self, 1, "Overflowed CNetworkStringTableContainer::WriteBaselines, try restarting your client and reconnecting");
+}
+
+bool ProcessConnectionlessPacketHook(void* a1, netpacket_t* packet)
+{
+	if (packet->adr.type == NA_IP &&
+		(!(packet->data[4] == 'N' && Cvar_net_datablock_enabled->GetBool()) || !Cvar_net_datablock_enabled->GetBool()))
+	{
+		// bad lookup: optimise later tm
+		UnconnectedPlayerSendData* sendData = nullptr;
+		for (UnconnectedPlayerSendData& foundSendData : g_ServerAuthenticationManager->m_unconnectedPlayerSendData)
+		{
+			if (!memcmp(packet->adr.ip, foundSendData.ip, 16))
+			{
+				sendData = &foundSendData;
+				break;
+			}
+		}
+
+		if (!sendData)
+		{
+			sendData = &g_ServerAuthenticationManager->m_unconnectedPlayerSendData.emplace_back();
+			memcpy(sendData->ip, packet->adr.ip, 16);
+		}
+
+		if (Plat_FloatTime() < sendData->timeoutEnd)
+			return false;
+
+		if (Plat_FloatTime() - sendData->lastQuotaStart >= 1.0)
+		{
+			sendData->lastQuotaStart = Plat_FloatTime();
+			sendData->packetCount = 0;
+		}
+
+		sendData->packetCount++;
+
+		if (sendData->packetCount >= Cvar_sv_querylimit_per_sec->GetInt())
+		{
+			spdlog::warn(
+				"Client went over connectionless ratelimit of {} per sec with packet of type {}",
+				Cvar_sv_querylimit_per_sec->GetInt(),
+				packet->data[4]);
+
+			// timeout for a minute
+			sendData->timeoutEnd = Plat_FloatTime() + 60.0;
+			return false;
+		}
+	}
+
+	return ProcessConnectionlessPacket(a1, packet);
+}
+
+void ResetPdataCommand(const CCommand& args)
+{
+	if (*sv_m_State == server_state_t::ss_active)
+	{
+		spdlog::error("ns_resetpersistence must be entered from the main menu");
+		return;
+	}
+
+	spdlog::info("resetting persistence on next lobby load...");
+	g_ServerAuthenticationManager->m_bForceReadLocalPlayerPersistenceFromDisk = true;
+}
+
+void InitialiseServerAuthentication(HMODULE baseAddress)
+{
+	g_ServerAuthenticationManager = new ServerAuthenticationManager;
+
+	Cvar_ns_erase_auth_info =
+		new ConVar("ns_erase_auth_info", "1", FCVAR_GAMEDLL, "Whether auth info should be erased from this server on disconnect or crash");
+	CVar_ns_auth_allow_insecure =
+		new ConVar("ns_auth_allow_insecure", "0", FCVAR_GAMEDLL, "Whether this server will allow unauthenicated players to connect");
+	CVar_ns_auth_allow_insecure_write = new ConVar(
+		"ns_auth_allow_insecure_write",
+		"0",
+		FCVAR_GAMEDLL,
+		"Whether the pdata of unauthenticated clients will be written to disk when changed");
+	// literally just stolen from a fix valve used in csgo
+	CVar_sv_quota_stringcmdspersecond = new ConVar(
+		"sv_quota_stringcmdspersecond",
+		"60",
+		FCVAR_GAMEDLL,
+		"How many string commands per second clients are allowed to submit, 0 to disallow all string commands");
+	// https://blog.counter-strike.net/index.php/2019/07/24922/ but different because idk how to check what current tick number is
+	Cvar_net_chan_limit_mode =
+		new ConVar("net_chan_limit_mode", "0", FCVAR_GAMEDLL, "The mode for netchan processing limits: 0 = log, 1 = kick");
+	Cvar_net_chan_limit_msec_per_sec = new ConVar(
+		"net_chan_limit_msec_per_sec",
+		"100",
+		FCVAR_GAMEDLL,
+		"Netchannel processing is limited to so many milliseconds, abort connection if exceeding budget");
+	Cvar_ns_should_log_all_clientcommands =
+		new ConVar("ns_should_log_all_clientcommands", "0", FCVAR_NONE, "Whether to log all clientcommands");
+	Cvar_ns_player_auth_port = new ConVar("ns_player_auth_port", "8081", FCVAR_GAMEDLL, "");
+	Cvar_sv_querylimit_per_sec = new ConVar("sv_querylimit_per_sec", "15", FCVAR_GAMEDLL, "");
+	Cvar_sv_max_chat_messages_per_sec = new ConVar("sv_max_chat_messages_per_sec", "5", FCVAR_GAMEDLL, "");
+
+	Cvar_net_datablock_enabled = g_pCVar->FindVar("net_datablock_enabled");
+
+	RegisterConCommand("ns_resetpersistence", ResetPdataCommand, "resets your pdata when you next enter the lobby", FCVAR_NONE);
+
+	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));
+	ENABLER_CREATEHOOK(
+		hook, (char*)baseAddress + 0x100F80, &CBaseClient__ActivatePlayerHook, reinterpret_cast<LPVOID*>(&CBaseClient__ActivatePlayer));
+	ENABLER_CREATEHOOK(
+		hook, (char*)baseAddress + 0x1012C0, &CBaseClient__DisconnectHook, reinterpret_cast<LPVOID*>(&CBaseClient__Disconnect));
+	ENABLER_CREATEHOOK(
+		hook,
+		(char*)baseAddress + 0x1022E0,
+		&CGameClient__ExecuteStringCommandHook,
+		reinterpret_cast<LPVOID*>(&CGameClient__ExecuteStringCommand));
+	ENABLER_CREATEHOOK(
+		hook, (char*)baseAddress + 0x2140A0, &CNetChan___ProcessMessagesHook, reinterpret_cast<LPVOID*>(&CNetChan___ProcessMessages));
+	ENABLER_CREATEHOOK(
+		hook, (char*)baseAddress + 0x104FB0, &CBaseClient__SendServerInfoHook, reinterpret_cast<LPVOID*>(&CBaseClient__SendServerInfo));
+	ENABLER_CREATEHOOK(
+		hook, (char*)baseAddress + 0x117800, &ProcessConnectionlessPacketHook, reinterpret_cast<LPVOID*>(&ProcessConnectionlessPacket));
+
+	CCommand__Tokenize = (CCommand__TokenizeType)((char*)baseAddress + 0x418380);
+
+	uintptr_t ba = (uintptr_t)baseAddress;
+
+	// patch to disable kicking based on incorrect serverfilter in connectclient, since we repurpose it for use as an auth token
+	{
+		NSMem::BytePatch(
+			ba + 0x114655,
+			"EB" // jz => jmp
+		);
+	}
+
+	// patch to disable fairfight marking players as cheaters and kicking them
+	{
+		NSMem::BytePatch(
+			ba + 0x101012,
+			"E9 90 00" // jz => jmp
+		);
+	}
+
+	// patch to allow same of multiple account
+	if (CommandLine()->CheckParm("-allowdupeaccounts"))
+	{
+		NSMem::BytePatch(
+			ba + 0x114510,
+			"EB" // jz => jmp
+		);
+	}
+
+	// patch to set bWasWritingStringTableSuccessful in CNetworkStringTableContainer::WriteBaselines if it fails
+	{
+		uintptr_t writeAddress = (uintptr_t)(&bWasWritingStringTableSuccessful - (ba + 0x234EDC));
+
+		auto addr = ba + 0x234ED2;
+		NSMem::BytePatch(addr, "C7 05");
+		NSMem::BytePatch(addr + 2, (BYTE*)&writeAddress, sizeof(writeAddress));
+
+		NSMem::BytePatch(addr + 6, "00 00 00 00");
+
+		NSMem::NOP(addr + 10, 5);
+	}
+}