Pentest 59.4 HIGH: IPv4-mapped IPv6 in SSRF-Guard blocken (alle Schreibweisen)
Node's URL-Parser normalisiert IPv4-mapped IPv6 von Dotted- in Hex-Form: `::ffff:127.0.0.1` → `::ffff:7f00:1`, `::ffff:169.254.169.254` → `::ffff:a9fe:a9fe` (GCP/AWS-Metadata!), `::ffff:10.0.0.1` → `::ffff:a00:1`. Die bisherigen Patterns (`::ffff:127\.` etc.) matchten nur die Dotted-Form. Sobald die URL durch `new URL()` lief, wurde der Host in Hex-Form herausgereicht und kam an der Blocklist vorbei – live verifiziert auf test-mail-access mit allen drei Payloads. Fix in ssrfGuard.ts: - Neuer extractMappedIPv4-Helper: erkennt Compact-Dotted, Compact-Hex, Expanded-Dotted, Expanded-Hex – konvertiert auf Dotted-IPv4. - Neuer checkIPv4-Helper: läuft die IPv4 durch BLOCKED_PATTERNS und (optional) PRIVATE_IP_PATTERNS, mit BLOCKED/PRIVATE_HOSTNAMES. - isBlockedSsrfHost + isPrivateOrBlockedHost rufen den IPv4-Check bei Mapped-IPv6 zusätzlich auf. Plain IPv4 und Hex-Form werden damit gleich behandelt. Verifiziert mit 15-Tests: ::ffff:7f00:1, ::ffff:a9fe:a9fe, 0:0:0:0:0:ffff:7f00:1 etc. werden alle geblockt; legitime IPs (8.8.8.8, ::ffff:8.8.8.8) bleiben durchlässig. Nebenbefund (Consent-URL = localhost): - getPublicUrl in auth.service jetzt EXPORT (vorher private). - gdpr.controller (sendConsentLink + send-privacy-link) nutzt jetzt getPublicUrl statt direkt PUBLIC_URL/origin/localhost- Kette. Damit greift die admin-konfigurierte AppSetting `portalLoginUrl` auch hier. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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@@ -4,6 +4,7 @@ import * as gdprService from '../services/gdpr.service.js';
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import * as consentService from '../services/consent.service.js';
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import * as consentPublicService from '../services/consent-public.service.js';
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import * as appSettingService from '../services/appSetting.service.js';
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import { getPublicUrl } from '../services/auth.service.js';
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import { canAccessCustomer } from '../utils/accessControl.js';
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import { createAuditLog, logChange } from '../services/audit.service.js';
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import { ConsentType, DeletionRequestStatus } from '@prisma/client';
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@@ -572,7 +573,10 @@ export async function sendConsentLink(req: AuthRequest, res: Response) {
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// ConsentHash sicherstellen
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const hash = await consentPublicService.ensureConsentHash(customerId);
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const baseUrl = process.env.PUBLIC_URL || req.headers.origin || 'http://localhost:5173';
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// 59.4 Nebenbefund: nicht mehr direkt aus env, sondern über
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// getPublicUrl – nimmt zuerst die admin-konfigurierte AppSetting
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// `portalLoginUrl`, dann PUBLIC_URL, dann Localhost-Fallback.
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const baseUrl = await getPublicUrl();
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const consentUrl = `${baseUrl}/datenschutz/${hash}`;
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// Bei E-Mail: tatsächlich senden
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@@ -715,7 +719,10 @@ export async function sendAuthorizationRequest(req: AuthRequest, res: Response)
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return res.status(404).json({ success: false, error: 'Kunde oder Vertreter nicht gefunden' });
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}
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const baseUrl = process.env.PUBLIC_URL || req.headers.origin || 'http://localhost:5173';
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// 59.4 Nebenbefund: nicht mehr direkt aus env, sondern über
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// getPublicUrl – nimmt zuerst die admin-konfigurierte AppSetting
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// `portalLoginUrl`, dann PUBLIC_URL, dann Localhost-Fallback.
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const baseUrl = await getPublicUrl();
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const portalUrl = `${baseUrl}/privacy`;
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// E-Mail senden
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@@ -593,7 +593,13 @@ function generateResetToken(): string {
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* Hat Trailing-Slash-Bereinigung, sonst kommen Links wie
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* `https://crm.de//portal/login` zustande.
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*/
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async function getPublicUrl(): Promise<string> {
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// Pentest 59.4 Nebenbefund (2026-06-01): Consent-URL kam mit
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// `localhost:5173` raus, weil PUBLIC_URL nicht gesetzt war und
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// req.headers.origin im Hintergrund-Pfad nicht greift. Helper jetzt
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// EXPORT, damit auch der GDPR-Controller (sendConsentLink etc.)
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// dieselbe Quelle der Wahrheit nutzt – inklusive admin-konfigurierbarer
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// portalLoginUrl App-Setting.
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export async function getPublicUrl(): Promise<string> {
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const fromSettings = await appSettingService.getSetting('portalLoginUrl');
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const raw = (fromSettings && fromSettings.trim())
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|| process.env.PUBLIC_URL
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@@ -84,6 +84,57 @@ const BLOCKED_HOSTNAMES = new Set([
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'[::1]',
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]);
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/**
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* Pentest 59.4 (HIGH, 2026-06-01): Node's URL-Parser normalisiert
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* IPv4-mapped IPv6 zur **Hex-Form**:
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* `::ffff:127.0.0.1` → `::ffff:7f00:1`
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* `::ffff:169.254.169.254` → `::ffff:a9fe:a9fe` (GCP/AWS Metadata!)
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* `::ffff:10.0.0.1` → `::ffff:a00:1`
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*
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* Die alten Patterns (`::ffff:127\.`, `::ffff:10\.` etc.) griffen nur
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* auf die Dotted-Form – Angreifer konnten via URL-Brackets die Hex-Form
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* an der Blocklist vorbeischleusen, weil `new URL()` umnormalisiert.
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*
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* Lösung: aus IPv4-mapped IPv6 extrahieren wir den IPv4-Anteil und
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* lassen ihn durch die IPv4-Patterns laufen. Das deckt beide Schreib-
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* weisen + ausgeschriebene Long-Form ab.
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*/
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function extractMappedIPv4(addr: string): string | null {
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// Compact dotted: ::ffff:127.0.0.1
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let m = /^::ffff:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/i.exec(addr);
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if (m) return m[1];
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// Compact hex: ::ffff:7f00:1
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m = /^::ffff:([0-9a-f]{1,4}):([0-9a-f]{1,4})$/i.exec(addr);
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if (m) {
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const h1 = parseInt(m[1], 16);
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const h2 = parseInt(m[2], 16);
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if (!Number.isFinite(h1) || !Number.isFinite(h2) || h1 > 0xffff || h2 > 0xffff) return null;
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return `${(h1 >> 8) & 0xff}.${h1 & 0xff}.${(h2 >> 8) & 0xff}.${h2 & 0xff}`;
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}
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// Expanded dotted: 0:0:0:0:0:ffff:127.0.0.1
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m = /^0:0:0:0:0:ffff:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/i.exec(addr);
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if (m) return m[1];
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// Expanded hex: 0:0:0:0:0:ffff:7f00:1
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m = /^0:0:0:0:0:ffff:([0-9a-f]{1,4}):([0-9a-f]{1,4})$/i.exec(addr);
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if (m) {
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const h1 = parseInt(m[1], 16);
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const h2 = parseInt(m[2], 16);
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if (!Number.isFinite(h1) || !Number.isFinite(h2) || h1 > 0xffff || h2 > 0xffff) return null;
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return `${(h1 >> 8) & 0xff}.${h1 & 0xff}.${(h2 >> 8) & 0xff}.${h2 & 0xff}`;
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}
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return null;
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}
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function checkIPv4(ipv4: string, includePrivate: boolean): boolean {
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if (BLOCKED_HOSTNAMES.has(ipv4)) return true;
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for (const pattern of BLOCKED_PATTERNS) if (pattern.test(ipv4)) return true;
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if (includePrivate) {
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if (PRIVATE_HOSTNAMES.has(ipv4)) return true;
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for (const pattern of PRIVATE_IP_PATTERNS) if (pattern.test(ipv4)) return true;
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}
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return false;
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}
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export function isBlockedSsrfHost(host: string | null | undefined): boolean {
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if (!host) return false;
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const h = host.trim().toLowerCase();
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@@ -92,6 +143,10 @@ export function isBlockedSsrfHost(host: string | null | undefined): boolean {
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for (const pattern of BLOCKED_PATTERNS) {
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if (pattern.test(h)) return true;
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}
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// 59.4: IPv4-mapped IPv6 entpacken und die IPv4 separat prüfen –
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// egal ob Hex- oder Dotted-Form, egal ob compact oder expanded.
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const mappedV4 = extractMappedIPv4(h);
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if (mappedV4 && checkIPv4(mappedV4, BLOCK_PRIVATE_IPS)) return true;
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if (BLOCK_PRIVATE_IPS) {
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if (PRIVATE_HOSTNAMES.has(h)) return true;
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for (const pattern of PRIVATE_IP_PATTERNS) {
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@@ -123,6 +178,11 @@ export function isPrivateOrBlockedHost(host: string | null | undefined): boolean
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for (const pattern of PRIVATE_IP_PATTERNS) {
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if (pattern.test(h)) return true;
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}
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// 59.4: IPv4-mapped IPv6 strikt prüfen (Hex- + Dotted-Form,
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// compact + expanded). Pentester konnte ::ffff:7f00:1 statt
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// ::ffff:127.0.0.1 nutzen, weil URL-Parser umnormalisiert.
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const mappedV4 = extractMappedIPv4(h);
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if (mappedV4 && checkIPv4(mappedV4, true)) return true;
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return false;
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}
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