duffyduck/dyndns-server
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Security-Hardening (Pentest-Findings F-02 bis F-07)

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- CSRF-Schutz: session-gebundenes Token in allen POST-Formularen, serverseitig
  per before_request geprueft; /nic/update ausgenommen (Basic-Auth-API)
- Brute-Force-Schutz: DB-gestuetzter Login-Lockout pro Client-IP
  (5 Fehlversuche -> 15 min), echte IP via ProxyFix/X-Forwarded-For
- SSRF: validate_plesk_url() erzwingt http(s) und blockt Link-Local/Metadata,
  Multicast und reservierte Ziele
- Session-Cookies: HttpOnly, SameSite=Lax, Secure (per Env abschaltbar)
- Security-Header: CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy
- Generische Plesk-Fehlermeldungen (keine internen URLs im UI)
- CSS/JS nach static/ ausgelagert -> strikte CSP ohne 'unsafe-inline'
- login_attempts-Tabelle + README-Security-Abschnitt

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Stefan Hacker
2026-06-06 14:45:27 +02:00
parent 9c631992af
commit c3070469c1
10 changed files with 233 additions and 37 deletions
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app/templates/base.html
+3 -21
View File
@@ -6,26 +6,7 @@
<title>{% block title %}DynDNS Manager{% endblock %}</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css">
<style>
:root { --sidebar-bg: #1e2a38; --sidebar-hover: #2d3f52; }
body { background: #f4f6f9; min-height: 100vh; }
#sidebar {
width: 220px; min-width: 220px; min-height: 100vh;
background: var(--sidebar-bg); color: #cdd6e0;
}
#sidebar .brand { color: #4fc3f7; font-weight: 700; font-size: 1.1rem; }
#sidebar .nav-link {
color: #b0bec5; border-radius: 6px; padding: .5rem .75rem;
margin-bottom: 2px; transition: background .15s;
}
#sidebar .nav-link:hover, #sidebar .nav-link.active {
background: var(--sidebar-hover); color: #fff;
}
#sidebar .nav-link i { width: 1.3em; }
.main-content { flex: 1; padding: 2rem; min-width: 0; }
.card { border: none; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.badge-ip { font-family: monospace; font-size: .85em; }
</style>
<link rel="stylesheet" href="{{ url_for('static', filename='css/app.css') }}">
</head>
<body class="d-flex">
@@ -48,7 +29,7 @@
</a>
</div>
<div class="mt-auto">
<hr style="border-color:#2d3f52">
<hr>
<small class="text-secondary d-block mb-2 px-2">{{ session.admin_username }}</small>
<a href="{{ url_for('logout') }}" class="nav-link text-danger">
<i class="bi bi-box-arrow-left"></i> Abmelden
@@ -70,6 +51,7 @@
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
<script src="{{ url_for('static', filename='js/app.js') }}"></script>
{% block scripts %}{% endblock %}
</body>
</html>