#include "scripthttprequesthandler.h" #include "util/version.h" #include "squirrel/squirrel.h" #include "core/tier0.h" HttpRequestHandler* g_httpRequestHandler; bool IsHttpDisabled() { const static bool bIsHttpDisabled = CommandLine()->FindParm("-disablehttprequests"); return bIsHttpDisabled; } bool IsLocalHttpAllowed() { const static bool bIsLocalHttpAllowed = CommandLine()->FindParm("-allowlocalhttp"); return bIsLocalHttpAllowed; } bool DisableHttpSsl() { const static bool bDisableHttpSsl = CommandLine()->FindParm("-disablehttpssl"); return bDisableHttpSsl; } HttpRequestHandler::HttpRequestHandler() { // Cache the launch parameters as early as possible in order to avoid possible exploits that change them at runtime. IsHttpDisabled(); IsLocalHttpAllowed(); DisableHttpSsl(); } void HttpRequestHandler::StartHttpRequestHandler() { if (IsRunning()) { spdlog::warn("%s was called while IsRunning() is true!", __FUNCTION__); return; } m_bIsHttpRequestHandlerRunning = true; spdlog::info("HttpRequestHandler started."); } void HttpRequestHandler::StopHttpRequestHandler() { if (!IsRunning()) { spdlog::warn("%s was called while IsRunning() is false", __FUNCTION__); return; } m_bIsHttpRequestHandlerRunning = false; spdlog::info("HttpRequestHandler stopped."); } bool IsHttpDestinationHostAllowed(const std::string& host, std::string& outHostname, std::string& outAddress, std::string& outPort) { CURLU* url = curl_url(); if (!url) { spdlog::error("Failed to call curl_url() for http request."); return false; } if (curl_url_set(url, CURLUPART_URL, host.c_str(), CURLU_DEFAULT_SCHEME) != CURLUE_OK) { spdlog::error("Failed to parse destination URL for http request."); curl_url_cleanup(url); return false; } char* urlHostname = nullptr; if (curl_url_get(url, CURLUPART_HOST, &urlHostname, 0) != CURLUE_OK) { spdlog::error("Failed to parse hostname from destination URL for http request."); curl_url_cleanup(url); return false; } char* urlScheme = nullptr; if (curl_url_get(url, CURLUPART_SCHEME, &urlScheme, CURLU_DEFAULT_SCHEME) != CURLUE_OK) { spdlog::error("Failed to parse scheme from destination URL for http request."); curl_url_cleanup(url); curl_free(urlHostname); return false; } char* urlPort = nullptr; if (curl_url_get(url, CURLUPART_PORT, &urlPort, CURLU_DEFAULT_PORT) != CURLUE_OK) { spdlog::error("Failed to parse port from destination URL for http request."); curl_url_cleanup(url); curl_free(urlHostname); curl_free(urlScheme); return false; } // Resolve the hostname into an address. addrinfo* result; addrinfo hints; std::memset(&hints, 0, sizeof(addrinfo)); hints.ai_family = AF_UNSPEC; if (getaddrinfo(urlHostname, urlScheme, &hints, &result) != 0) { spdlog::error("Failed to resolve http request destination {} using getaddrinfo().", urlHostname); curl_url_cleanup(url); curl_free(urlHostname); curl_free(urlScheme); curl_free(urlPort); return false; } bool bFoundIPv6 = false; sockaddr_in* sockaddr_ipv4 = nullptr; for (addrinfo* info = result; info; info = info->ai_next) { if (info->ai_family == AF_INET) { sockaddr_ipv4 = (sockaddr_in*)info->ai_addr; break; } bFoundIPv6 = bFoundIPv6 || info->ai_family == AF_INET6; } if (sockaddr_ipv4 == nullptr) { if (bFoundIPv6) { spdlog::error("Only IPv4 destinations are supported for HTTP requests. To allow IPv6, launch the game using -allowlocalhttp."); } else { spdlog::error("Failed to resolve http request destination {} into a valid IPv4 address.", urlHostname); } curl_free(urlHostname); curl_free(urlScheme); curl_free(urlPort); curl_url_cleanup(url); return false; } // Fast checks for private ranges of IPv4. // clang-format off { auto addrBytes = sockaddr_ipv4->sin_addr.S_un.S_un_b; if (addrBytes.s_b1 == 10 // 10.0.0.0 - 10.255.255.255 (Class A Private) || addrBytes.s_b1 == 172 && addrBytes.s_b2 >= 16 && addrBytes.s_b2 <= 31 // 172.16.0.0 - 172.31.255.255 (Class B Private) || addrBytes.s_b1 == 192 && addrBytes.s_b2 == 168 // 192.168.0.0 - 192.168.255.255 (Class C Private) || addrBytes.s_b1 == 192 && addrBytes.s_b2 == 0 && addrBytes.s_b3 == 0 // 192.0.0.0 - 192.0.0.255 (IETF Assignment) || addrBytes.s_b1 == 192 && addrBytes.s_b2 == 0 && addrBytes.s_b3 == 2 // 192.0.2.0 - 192.0.2.255 (TEST-NET-1) || addrBytes.s_b1 == 192 && addrBytes.s_b2 == 88 && addrBytes.s_b3 == 99 // 192.88.99.0 - 192.88.99.255 (IPv4-IPv6 Relay) || addrBytes.s_b1 == 192 && addrBytes.s_b2 >= 18 && addrBytes.s_b2 <= 19 // 192.18.0.0 - 192.19.255.255 (Internet Benchmark) || addrBytes.s_b1 == 192 && addrBytes.s_b2 == 51 && addrBytes.s_b3 == 100 // 192.51.100.0 - 192.51.100.255 (TEST-NET-2) || addrBytes.s_b1 == 203 && addrBytes.s_b2 == 0 && addrBytes.s_b3 == 113 // 203.0.113.0 - 203.0.113.255 (TEST-NET-3) || addrBytes.s_b1 == 169 && addrBytes.s_b2 == 254 // 169.254.00 - 169.254.255.255 (Link-local/APIPA) || addrBytes.s_b1 == 127 // 127.0.0.0 - 127.255.255.255 (Loopback) || addrBytes.s_b1 == 0 // 0.0.0.0 - 0.255.255.255 (Current network) || addrBytes.s_b1 == 100 && addrBytes.s_b2 >= 64 && addrBytes.s_b2 <= 127 // 100.64.0.0 - 100.127.255.255 (Shared address space) || sockaddr_ipv4->sin_addr.S_un.S_addr == 0xFFFFFFFF // 255.255.255.255 (Broadcast) || addrBytes.s_b1 >= 224 && addrBytes.s_b2 <= 239 // 224.0.0.0 - 239.255.255.255 (Multicast) || addrBytes.s_b1 == 233 && addrBytes.s_b2 == 252 && addrBytes.s_b3 == 0 // 233.252.0.0 - 233.252.0.255 (MCAST-TEST-NET) || addrBytes.s_b1 >= 240 && addrBytes.s_b4 <= 254) // 240.0.0.0 - 255.255.255.254 (Future Use Class E) { curl_free(urlHostname); curl_free(urlScheme); curl_free(urlPort); curl_url_cleanup(url); return false; } } // clang-format on char resolvedStr[INET_ADDRSTRLEN]; inet_ntop(AF_INET, &sockaddr_ipv4->sin_addr, resolvedStr, INET_ADDRSTRLEN); // Use the resolved address as the new request host. outHostname = urlHostname; outAddress = resolvedStr; outPort = urlPort; freeaddrinfo(result); curl_free(urlHostname); curl_free(urlScheme); curl_free(urlPort); curl_url_cleanup(url); return true; } size_t HttpCurlWriteToStringBufferCallback(char* contents, size_t size, size_t nmemb, void* userp) { ((std::string*)userp)->append((char*)contents, size * nmemb); return size * nmemb; } template int HttpRequestHandler::MakeHttpRequest(const HttpRequest& requestParameters) { if (!IsRunning()) { spdlog::warn("%s was called while IsRunning() is false!", __FUNCTION__); return -1; } if (IsHttpDisabled()) { spdlog::warn("NS_InternalMakeHttpRequest called while the game is running with -disablehttprequests." " Please check if requests are allowed using NSIsHttpEnabled() first."); return -1; } bool bAllowLocalHttp = IsLocalHttpAllowed(); // This handle will be returned to Squirrel so it can wait for the response and assign a callback for it. int handle = ++m_iLastRequestHandle; std::thread requestThread( [this, handle, requestParameters, bAllowLocalHttp]() { std::string hostname, resolvedAddress, resolvedPort; if (!bAllowLocalHttp) { if (!IsHttpDestinationHostAllowed(requestParameters.baseUrl, hostname, resolvedAddress, resolvedPort)) { spdlog::warn( "HttpRequestHandler::MakeHttpRequest attempted to make a request to a private network. This is only allowed when " "running the game with -allowlocalhttp."); g_pSquirrel->AsyncCall( "NSHandleFailedHttpRequest", handle, (int)0, "Cannot make HTTP requests to private network hosts without -allowlocalhttp. Check your console for more " "information."); return; } } CURL* curl = curl_easy_init(); if (!curl) { spdlog::error("HttpRequestHandler::MakeHttpRequest failed to init libcurl for request."); g_pSquirrel->AsyncCall( "NSHandleFailedHttpRequest", handle, static_cast(CURLE_FAILED_INIT), curl_easy_strerror(CURLE_FAILED_INIT)); return; } // HEAD has no body. if (requestParameters.method == HttpRequestMethod::HRM_HEAD) { curl_easy_setopt(curl, CURLOPT_NOBODY, 1L); } curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, HttpRequestMethod::ToString(requestParameters.method).c_str()); // Only resolve to IPv4 if we don't allow private network requests. curl_slist* host = nullptr; if (!bAllowLocalHttp) { curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4); host = curl_slist_append(host, fmt::format("{}:{}:{}", hostname, resolvedPort, resolvedAddress).c_str()); curl_easy_setopt(curl, CURLOPT_RESOLVE, host); } // Ensure we only allow HTTP or HTTPS. curl_easy_setopt(curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS); // Allow redirects curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 3L); // Check if the url already contains a query. // If so, we'll know to append with & instead of start with ? std::string queryUrl = requestParameters.baseUrl; bool bUrlContainsQuery = false; // If this fails, just ignore the parsing and trust what the user wants to query. // Probably will fail but handling it here would be annoying. CURLU* curlUrl = curl_url(); if (curlUrl) { if (curl_url_set(curlUrl, CURLUPART_URL, queryUrl.c_str(), CURLU_DEFAULT_SCHEME) == CURLUE_OK) { char* currentQuery; if (curl_url_get(curlUrl, CURLUPART_QUERY, ¤tQuery, 0) == CURLUE_OK) { if (currentQuery && std::strlen(currentQuery) != 0) { bUrlContainsQuery = true; } } curl_free(currentQuery); } curl_url_cleanup(curlUrl); } // GET requests, or POST-like requests with an empty body, can have query parameters. // Append them to the base url. if (HttpRequestMethod::CanHaveQueryParameters(requestParameters.method) && !HttpRequestMethod::UsesCurlPostOptions(requestParameters.method) || requestParameters.body.empty()) { bool isFirstValue = true; for (const auto& kv : requestParameters.queryParameters) { char* key = curl_easy_escape(curl, kv.first.c_str(), (int)kv.first.length()); for (const std::string& queryValue : kv.second) { char* value = curl_easy_escape(curl, queryValue.c_str(), (int)queryValue.length()); if (isFirstValue && !bUrlContainsQuery) { queryUrl.append(fmt::format("?{}={}", key, value)); isFirstValue = false; } else { queryUrl.append(fmt::format("&{}={}", key, value)); } curl_free(value); } curl_free(key); } } // If this method uses POST-like curl options, set those and set the body. // The body won't be sent if it's empty anyway, meaning the query parameters above, if any, would be. if (HttpRequestMethod::UsesCurlPostOptions(requestParameters.method)) { // Grab the body and set it as a POST field curl_easy_setopt(curl, CURLOPT_POST, 1L); curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, requestParameters.body.length()); curl_easy_setopt(curl, CURLOPT_COPYPOSTFIELDS, requestParameters.body.c_str()); } // Set the full URL for this http request. curl_easy_setopt(curl, CURLOPT_URL, queryUrl.c_str()); std::string bodyBuffer; std::string headerBuffer; // Set up buffers to write the response headers and body. curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, HttpCurlWriteToStringBufferCallback); curl_easy_setopt(curl, CURLOPT_WRITEDATA, &bodyBuffer); curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, HttpCurlWriteToStringBufferCallback); curl_easy_setopt(curl, CURLOPT_HEADERDATA, &headerBuffer); // Add all the headers for the request. curl_slist* headers = nullptr; // Content-Type header for POST-like requests. if (HttpRequestMethod::UsesCurlPostOptions(requestParameters.method) && !requestParameters.body.empty()) { headers = curl_slist_append(headers, fmt::format("Content-Type: {}", requestParameters.contentType).c_str()); } for (const auto& kv : requestParameters.headers) { for (const std::string& headerValue : kv.second) { headers = curl_slist_append(headers, fmt::format("{}: {}", kv.first, headerValue).c_str()); } } if (headers != nullptr) { curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); } // Disable SSL checks if requested by the user. if (DisableHttpSsl()) { curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYSTATUS, 0L); } // Enforce the Northstar user agent, unless an override was specified. if (requestParameters.userAgent.empty()) { curl_easy_setopt(curl, CURLOPT_USERAGENT, &NSUserAgent); } else { curl_easy_setopt(curl, CURLOPT_USERAGENT, requestParameters.userAgent.c_str()); } // Set the timeout for this request. Max 60 seconds so mods can't just spin up native threads all the time. curl_easy_setopt(curl, CURLOPT_TIMEOUT, std::clamp(requestParameters.timeout, 1, 60)); CURLcode result = curl_easy_perform(curl); if (IsRunning()) { if (result == CURLE_OK) { // While the curl request is OK, it could return a non success code. // Squirrel side will handle firing the correct callback. long httpCode = 0; curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpCode); g_pSquirrel->AsyncCall( "NSHandleSuccessfulHttpRequest", handle, static_cast(httpCode), bodyBuffer, headerBuffer); } else { // Pass CURL result code & error. spdlog::error( "curl_easy_perform() failed with code {}, error: {}", static_cast(result), curl_easy_strerror(result)); // If it's an SSL issue, tell the user they may disable SSL checks using -disablehttpssl. if (result == CURLE_PEER_FAILED_VERIFICATION || result == CURLE_SSL_CERTPROBLEM || result == CURLE_SSL_INVALIDCERTSTATUS) { spdlog::error("You can try disabling SSL verifications for this issue using the -disablehttpssl launch argument. " "Keep in mind this is potentially dangerous!"); } g_pSquirrel->AsyncCall( "NSHandleFailedHttpRequest", handle, static_cast(result), curl_easy_strerror(result)); } } curl_easy_cleanup(curl); curl_slist_free_all(headers); curl_slist_free_all(host); }); requestThread.detach(); return handle; } // int NS_InternalMakeHttpRequest(int method, string baseUrl, table headers, table queryParams, // string contentType, string body, int timeout, string userAgent) template SQRESULT SQ_InternalMakeHttpRequest(HSQUIRRELVM sqvm) { if (!g_httpRequestHandler || !g_httpRequestHandler->IsRunning()) { spdlog::warn("NS_InternalMakeHttpRequest called while the http request handler isn't running."); g_pSquirrel->pushinteger(sqvm, -1); return SQRESULT_NOTNULL; } if (IsHttpDisabled()) { spdlog::warn("NS_InternalMakeHttpRequest called while the game is running with -disablehttprequests." " Please check if requests are allowed using NSIsHttpEnabled() first."); g_pSquirrel->pushinteger(sqvm, -1); return SQRESULT_NOTNULL; } HttpRequest request; request.method = static_cast(g_pSquirrel->getinteger(sqvm, 1)); request.baseUrl = g_pSquirrel->getstring(sqvm, 2); // Read the tables for headers and query parameters. SQTable* headerTable = sqvm->_stackOfCurrentFunction[3]._VAL.asTable; for (int idx = 0; idx < headerTable->_numOfNodes; ++idx) { SQTable::_HashNode* node = &headerTable->_nodes[idx]; if (node->key._Type == OT_STRING && node->val._Type == OT_ARRAY) { SQArray* valueArray = node->val._VAL.asArray; std::vector headerValues; for (int vIdx = 0; vIdx < valueArray->_usedSlots; ++vIdx) { if (valueArray->_values[vIdx]._Type == OT_STRING) { headerValues.push_back(valueArray->_values[vIdx]._VAL.asString->_val); } } request.headers[node->key._VAL.asString->_val] = headerValues; } } SQTable* queryTable = sqvm->_stackOfCurrentFunction[4]._VAL.asTable; for (int idx = 0; idx < queryTable->_numOfNodes; ++idx) { SQTable::_HashNode* node = &queryTable->_nodes[idx]; if (node->key._Type == OT_STRING && node->val._Type == OT_ARRAY) { SQArray* valueArray = node->val._VAL.asArray; std::vector queryValues; for (int vIdx = 0; vIdx < valueArray->_usedSlots; ++vIdx) { if (valueArray->_values[vIdx]._Type == OT_STRING) { queryValues.push_back(valueArray->_values[vIdx]._VAL.asString->_val); } } request.queryParameters[node->key._VAL.asString->_val] = queryValues; } } request.contentType = g_pSquirrel->getstring(sqvm, 5); request.body = g_pSquirrel->getstring(sqvm, 6); request.timeout = g_pSquirrel->getinteger(sqvm, 7); request.userAgent = g_pSquirrel->getstring(sqvm, 8); int handle = g_httpRequestHandler->MakeHttpRequest(request); g_pSquirrel->pushinteger(sqvm, handle); return SQRESULT_NOTNULL; } // bool NSIsHttpEnabled() template SQRESULT SQ_IsHttpEnabled(HSQUIRRELVM sqvm) { g_pSquirrel->pushbool(sqvm, !IsHttpDisabled()); return SQRESULT_NOTNULL; } // bool NSIsLocalHttpAllowed() template SQRESULT SQ_IsLocalHttpAllowed(HSQUIRRELVM sqvm) { g_pSquirrel->pushbool(sqvm, IsLocalHttpAllowed()); return SQRESULT_NOTNULL; } template void HttpRequestHandler::RegisterSQFuncs() { g_pSquirrel->AddFuncRegistration( "int", "NS_InternalMakeHttpRequest", "int method, string baseUrl, table > headers, table > queryParams, string contentType, " "string body, " "int timeout, string userAgent", "[Internal use only] Passes the HttpRequest struct fields to be reconstructed in native and used for an http request", SQ_InternalMakeHttpRequest); g_pSquirrel->AddFuncRegistration( "bool", "NSIsHttpEnabled", "", "Whether or not HTTP requests are enabled. You can opt-out by starting the game with -disablehttprequests.", SQ_IsHttpEnabled); g_pSquirrel->AddFuncRegistration( "bool", "NSIsLocalHttpAllowed", "", "Whether or not HTTP requests can be made to a private network address. You can enable this by starting the game with " "-allowlocalhttp.", SQ_IsLocalHttpAllowed); } ON_DLL_LOAD_RELIESON("client.dll", HttpRequestHandler_ClientInit, ClientSquirrel, (CModule module)) { g_httpRequestHandler->RegisterSQFuncs(); g_httpRequestHandler->RegisterSQFuncs(); } ON_DLL_LOAD_RELIESON("server.dll", HttpRequestHandler_ServerInit, ServerSquirrel, (CModule module)) { g_httpRequestHandler->RegisterSQFuncs(); } ON_DLL_LOAD("engine.dll", HttpRequestHandler_Init, (CModule module)) { g_httpRequestHandler = new HttpRequestHandler; g_httpRequestHandler->StartHttpRequestHandler(); }