diff options
Diffstat (limited to 'NorthstarDLL/serverauthentication.cpp')
| -rw-r--r-- | NorthstarDLL/serverauthentication.cpp | 755 |
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); + } +} |