Enhance API functionality and security: Added rate limiting and domain validation across multiple API endpoints, improved error handling for missing or invalid parameters, and refactored email handling in contact form for better security and maintainability. Updated README.md with production build instructions and prerequisites.

2026-05-22 14:50:20 +02:00
parent 5f5be4a4cb
commit ebf6f82bb6
21 changed files with 1007 additions and 355 deletions
--- a/backend/api/dns-lookup.php
+++ b/backend/api/dns-lookup.php
@@ -1,12 +1,14 @@
 <?php
 /**
 * HexaDNS - DNS Lookup API
- * 
+ *
 * Führt echte DNS-Abfragen durch und gibt die Ergebnisse als JSON zurück.
- * 
+ *
 * Verwendung: GET /api/dns-lookup.php?domain=example.com
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 // CORS Headers für Frontend-Zugriff
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
@@ -19,26 +21,21 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

-// Nur GET-Anfragen erlauben
 if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    echo json_encode(['error' => 'Nur GET-Anfragen erlaubt']);
    exit;
 }

-// Domain-Parameter prüfen
-$domain = isset($_GET['domain']) ? trim($_GET['domain']) : '';
-
-if (empty($domain)) {
-    http_response_code(400);
-    echo json_encode(['error' => 'Domain-Parameter fehlt']);
-    exit;
+if (!checkApiRateLimit('dns-lookup')) {
+    rejectApiRateLimit();
 }

-// Domain validieren (einfache Prüfung)
-if (!preg_match('/^[a-zA-Z0-9][a-zA-Z0-9\-\.]*\.[a-zA-Z]{2,}$/', $domain)) {
+$domain = getValidatedDomainParam();
+
+if ($domain === null) {
    http_response_code(400);
-    echo json_encode(['error' => 'Ungültiges Domain-Format']);
+    echo json_encode(['error' => empty($_GET['domain']) ? 'Domain-Parameter fehlt' : 'Ungültiges Domain-Format']);
    exit;
 }

--- a/backend/api/dns-propagation.php
+++ b/backend/api/dns-propagation.php
@@ -1,12 +1,14 @@
 <?php
 /**
 * HexaDNS - DNS Propagation Check API
- * 
+ *
 * Prüft DNS-Records bei verschiedenen öffentlichen DNS-Servern
- * 
+ *
 * Verwendung: GET /api/dns-propagation.php?domain=example.com&type=A
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: GET, OPTIONS');
@@ -17,6 +19,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

+if (!checkApiRateLimit('dns-propagation')) {
+    rejectApiRateLimit();
+}
+
 // Öffentliche DNS-Server für Propagation-Check
 $dnsServers = [
    ['name' => 'Google', 'ip' => '8.8.8.8', 'location' => 'Global'],
@@ -29,18 +35,12 @@ $dnsServers = [
    ['name' => 'Level3', 'ip' => '4.2.2.1', 'location' => 'USA'],
 ];

-$domain = isset($_GET['domain']) ? trim($_GET['domain']) : '';
+$domain = getValidatedDomainParam();
 $type = isset($_GET['type']) ? strtoupper(trim($_GET['type'])) : 'A';

-if (empty($domain)) {
+if ($domain === null) {
    http_response_code(400);
-    echo json_encode(['error' => 'Domain-Parameter fehlt']);
-    exit;
-}
-
-if (!preg_match('/^[a-zA-Z0-9][a-zA-Z0-9\-\.]*\.[a-zA-Z]{2,}$/', $domain)) {
-    http_response_code(400);
-    echo json_encode(['error' => 'Ungültiges Domain-Format']);
+    echo json_encode(['error' => empty($_GET['domain']) ? 'Domain-Parameter fehlt' : 'Ungültiges Domain-Format']);
    exit;
 }

@@ -100,7 +100,12 @@ function queryDnsServer(string $domain, string $type, string $server): array {
    $records = [];
    
    // Versuche zuerst dig zu verwenden (genauer)
-    $digResult = @shell_exec("dig @{$server} {$domain} {$type} +short +time=2 +tries=1 2>/dev/null");
+    $digResult = @shell_exec(
+        'dig @' . escapeshellarg($server) . ' '
+        . escapeshellarg($domain) . ' '
+        . escapeshellarg($type)
+        . ' +short +time=2 +tries=1 2>/dev/null'
+    );
    
    if ($digResult !== null && trim($digResult) !== '') {
        $lines = array_filter(explode("\n", trim($digResult)));
--- a/backend/api/ping-check.php
+++ b/backend/api/ping-check.php
@@ -7,6 +7,8 @@
 * Verwendung: GET /api/ping-check.php?domain=example.com
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: GET, OPTIONS');
@@ -17,21 +19,15 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

-$domain = isset($_GET['domain']) ? trim($_GET['domain']) : '';
-
-if (empty($domain)) {
-    http_response_code(400);
-    echo json_encode(['error' => 'Domain-Parameter fehlt']);
-    exit;
+if (!checkApiRateLimit('ping-check')) {
+    rejectApiRateLimit();
 }

-// Protokoll und Pfad entfernen
-$domain = preg_replace('/^(https?:\/\/)?/', '', $domain);
-$domain = explode('/', $domain)[0];
+$domain = getValidatedDomainParam();

-if (!preg_match('/^[a-zA-Z0-9][a-zA-Z0-9\-\.]*\.[a-zA-Z]{2,}$/', $domain)) {
+if ($domain === null) {
    http_response_code(400);
-    echo json_encode(['error' => 'Ungültiges Domain-Format']);
+    echo json_encode(['error' => empty($_GET['domain']) ? 'Domain-Parameter fehlt' : 'Ungültiges Domain-Format']);
    exit;
 }

@@ -99,7 +95,8 @@ function checkIcmpPing(string $domain): array {
    ];
    
    // Versuche ping-Kommando
-    $pingResult = @shell_exec("ping -c 3 -W 2 {$domain} 2>/dev/null");
+    $safeDomain = escapeshellarg($domain);
+    $pingResult = @shell_exec("ping -c 3 -W 2 {$safeDomain} 2>/dev/null");
    
    if ($pingResult) {
        // Prüfe auf erfolgreiche Antworten
--- a/backend/api/reverse-dns.php
+++ b/backend/api/reverse-dns.php
@@ -1,12 +1,14 @@
 <?php
 /**
 * HexaDNS - Reverse DNS Lookup API
- * 
+ *
 * Löst eine IP-Adresse zu einem Hostnamen auf
- * 
+ *
 * Verwendung: GET /api/reverse-dns.php?ip=8.8.8.8
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: GET, OPTIONS');
@@ -17,6 +19,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

+if (!checkApiRateLimit('reverse-dns')) {
+    rejectApiRateLimit();
+}
+
 $ip = isset($_GET['ip']) ? trim($_GET['ip']) : '';

 if (empty($ip)) {
--- a/backend/api/ssl-check.php
+++ b/backend/api/ssl-check.php
@@ -1,12 +1,14 @@
 <?php
 /**
 * HexaDNS - SSL Certificate Check API
- * 
+ *
 * Prüft SSL-Zertifikat-Informationen einer Domain
- * 
+ *
 * Verwendung: GET /api/ssl-check.php?domain=example.com
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: GET, OPTIONS');
@@ -17,22 +19,15 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

-$domain = isset($_GET['domain']) ? trim($_GET['domain']) : '';
-
-if (empty($domain)) {
-    http_response_code(400);
-    echo json_encode(['error' => 'Domain-Parameter fehlt']);
-    exit;
+if (!checkApiRateLimit('ssl-check')) {
+    rejectApiRateLimit();
 }

-// Protokoll und Pfad entfernen
-$domain = preg_replace('/^(https?:\/\/)?/', '', $domain);
-$domain = explode('/', $domain)[0];
-$domain = explode(':', $domain)[0]; // Port entfernen
+$domain = getValidatedDomainParam();

-if (!preg_match('/^[a-zA-Z0-9][a-zA-Z0-9\-\.]*\.[a-zA-Z]{2,}$/', $domain)) {
+if ($domain === null) {
    http_response_code(400);
-    echo json_encode(['error' => 'Ungültiges Domain-Format']);
+    echo json_encode(['error' => empty($_GET['domain']) ? 'Domain-Parameter fehlt' : 'Ungültiges Domain-Format']);
    exit;
 }

--- a/backend/api/whois-lookup.php
+++ b/backend/api/whois-lookup.php
@@ -1,12 +1,14 @@
 <?php
 /**
 * HexaDNS - WHOIS Lookup API
- * 
+ *
 * Ruft WHOIS-Informationen für eine Domain ab
- * 
+ *
 * Verwendung: GET /api/whois-lookup.php?domain=example.com
 */

+require_once __DIR__ . '/../includes/api-helpers.php';
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: GET, OPTIONS');
@@ -17,7 +19,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit;
 }

-$domain = isset($_GET['domain']) ? trim($_GET['domain']) : '';
+if (!checkApiRateLimit('whois-lookup')) {
+    rejectApiRateLimit();
+}
+
+$domain = isset($_GET['domain']) ? trim((string) $_GET['domain']) : '';

 if (empty($domain)) {
    http_response_code(400);