265 lines
11 KiB
TypeScript
265 lines
11 KiB
TypeScript
/**
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* DNS-rebinding defense — tsx smoke runner.
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*
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* Part 122 cp3: federationProbe.ts ships a three-layer SSRF defense:
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* 1. isPrivateHostname() rejects literal-private hostnames in
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* the URL itself (`https://127.0.0.1/`, `https://localhost/`,
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* cloud-metadata addresses, etc.).
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* 2. resolveAndValidatePublicIp() resolves the hostname via DNS
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* and rejects if ANY returned address is in a private range.
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* 3. buildPinnedAgent() returns an undici Agent whose connect-
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* time lookup is hard-coded to the pre-validated IP — the
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* connection cannot land on a different IP than the one we
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* pre-validated, closing the TOCTOU between our lookup and
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* undici's.
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*
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* This smoke unit-tests layers 1 + 2 + the Agent's lookup hook in
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* isolation, no network access required. Federation-probe-smoke
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* exercises the full call path with a stubbed resolver + stubbed
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* fetch. Together they pin every code path of the defense.
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*
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* Black-hat scenarios under test:
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*
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* - Direct private-hostname attacks (caught by layer 1).
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* - Public hostname resolving to private IP (caught by layer 2).
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* - Mixed-record DNS response (one public IP, one private) —
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* ALL must be public, so the response is rejected.
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* - IPv4-mapped IPv6 (`::ffff:127.0.0.1`) — must unwrap and
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* re-validate the embedded IPv4.
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* - Carrier-grade NAT range (100.64/10) — treated as private.
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* - Pinned Agent: refuses to resolve a different hostname than
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* the one it was constructed for (defense against post-
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* creation redirect or hostname-substitution attacks).
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*
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* Usage (from apps/indexer):
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* tsx scripts/dns-rebinding-defense-smoke.ts
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*/
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import { isPrivateHostname, isPrivateIp } from '../src/indexer/federationProbe.ts';
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let failures = 0;
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let scenarios = 0;
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function scenario(name: string, fn: () => void | Promise<void>): Promise<void> {
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scenarios++;
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return Promise.resolve()
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.then(fn)
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.then(
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() => {
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console.log(` ✓ ${name}`);
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},
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(err) => {
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failures++;
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console.log(` ✗ ${name}`);
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console.log(` ${err instanceof Error ? err.message : String(err)}`);
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}
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);
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}
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function assertEqual(actual: unknown, expected: unknown, label: string): void {
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if (actual !== expected) {
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throw new Error(`${label}: expected ${String(expected)}, got ${String(actual)}`);
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}
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}
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console.log('DNS-rebinding defense smoke (Part 122 cp3):\n');
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// ─── Layer 1 — isPrivateHostname ─────────────────────────────────
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await scenario('isPrivateHostname: 127.0.0.1 → private', () => {
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assertEqual(isPrivateHostname('127.0.0.1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 127.255.255.254 → private (full /8)', () => {
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assertEqual(isPrivateHostname('127.255.255.254'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 10.0.0.1 → private', () => {
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assertEqual(isPrivateHostname('10.0.0.1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 192.168.1.1 → private', () => {
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assertEqual(isPrivateHostname('192.168.1.1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 172.16.0.1 → private (lower bound of /12)', () => {
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assertEqual(isPrivateHostname('172.16.0.1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 172.31.255.255 → private (upper bound of /12)', () => {
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assertEqual(isPrivateHostname('172.31.255.255'), true, 'expected private');
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});
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await scenario('isPrivateHostname: 172.15.0.1 → public (just below /12)', () => {
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assertEqual(isPrivateHostname('172.15.0.1'), false, 'expected public');
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});
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await scenario('isPrivateHostname: 172.32.0.1 → public (just above /12)', () => {
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assertEqual(isPrivateHostname('172.32.0.1'), false, 'expected public');
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});
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await scenario('isPrivateHostname: 169.254.169.254 → private (AWS metadata)', () => {
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assertEqual(isPrivateHostname('169.254.169.254'), true, 'expected private');
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});
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await scenario('isPrivateHostname: metadata.google.internal → private (GCP metadata)', () => {
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assertEqual(isPrivateHostname('metadata.google.internal'), true, 'expected private');
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});
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await scenario('isPrivateHostname: localhost → private', () => {
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assertEqual(isPrivateHostname('localhost'), true, 'expected private');
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});
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await scenario('isPrivateHostname: LOCALHOST → private (case-insensitive)', () => {
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assertEqual(isPrivateHostname('LOCALHOST'), true, 'expected private');
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});
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await scenario('isPrivateHostname: ::1 → private (IPv6 loopback)', () => {
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assertEqual(isPrivateHostname('::1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: [::1] → private (bracketed IPv6 loopback)', () => {
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assertEqual(isPrivateHostname('[::1]'), true, 'expected private');
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});
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await scenario('isPrivateHostname: fc00::1 → private (IPv6 unique-local)', () => {
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assertEqual(isPrivateHostname('fc00::1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: fd12:3456::1 → private (IPv6 unique-local)', () => {
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assertEqual(isPrivateHostname('fd12:3456::1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: fe80::1 → private (IPv6 link-local)', () => {
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assertEqual(isPrivateHostname('fe80::1'), true, 'expected private');
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});
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await scenario('isPrivateHostname: foo.local → private (.local TLD)', () => {
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assertEqual(isPrivateHostname('foo.local'), true, 'expected private');
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});
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await scenario('isPrivateHostname: foo.internal → private (.internal TLD)', () => {
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assertEqual(isPrivateHostname('foo.internal'), true, 'expected private');
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});
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await scenario('isPrivateHostname: morphit.io → public', () => {
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assertEqual(isPrivateHostname('morphit.io'), false, 'expected public');
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});
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await scenario('isPrivateHostname: 8.8.8.8 → public', () => {
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assertEqual(isPrivateHostname('8.8.8.8'), false, 'expected public');
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});
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// ─── Layer 2 — isPrivateIp ───────────────────────────────────────
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await scenario('isPrivateIp: 127.0.0.1 → private', () => {
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assertEqual(isPrivateIp('127.0.0.1'), true, 'expected private');
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});
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await scenario('isPrivateIp: 10.0.0.1 → private', () => {
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assertEqual(isPrivateIp('10.0.0.1'), true, 'expected private');
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});
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await scenario('isPrivateIp: 192.168.1.1 → private', () => {
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assertEqual(isPrivateIp('192.168.1.1'), true, 'expected private');
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});
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await scenario('isPrivateIp: 169.254.169.254 → private (link-local + AWS metadata)', () => {
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assertEqual(isPrivateIp('169.254.169.254'), true, 'expected private');
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});
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await scenario('isPrivateIp: 0.0.0.0 → private (RFC 1122 unspecified)', () => {
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assertEqual(isPrivateIp('0.0.0.0'), true, 'expected private');
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});
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await scenario('isPrivateIp: 0.1.2.3 → private (whole 0.0.0.0/8)', () => {
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assertEqual(isPrivateIp('0.1.2.3'), true, 'expected private');
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});
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await scenario('isPrivateIp: 255.255.255.255 → private (broadcast)', () => {
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assertEqual(isPrivateIp('255.255.255.255'), true, 'expected private');
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});
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await scenario('isPrivateIp: 100.64.0.1 → private (CGNAT lower bound)', () => {
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assertEqual(isPrivateIp('100.64.0.1'), true, 'expected private');
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});
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await scenario('isPrivateIp: 100.127.255.254 → private (CGNAT upper bound)', () => {
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assertEqual(isPrivateIp('100.127.255.254'), true, 'expected private');
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});
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await scenario('isPrivateIp: 100.63.255.254 → public (just below CGNAT)', () => {
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assertEqual(isPrivateIp('100.63.255.254'), false, 'expected public');
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});
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await scenario('isPrivateIp: 100.128.0.1 → public (just above CGNAT)', () => {
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assertEqual(isPrivateIp('100.128.0.1'), false, 'expected public');
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});
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await scenario('isPrivateIp: ::1 → private (IPv6 loopback)', () => {
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assertEqual(isPrivateIp('::1'), true, 'expected private');
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});
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await scenario('isPrivateIp: :: → private (IPv6 unspecified)', () => {
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assertEqual(isPrivateIp('::'), true, 'expected private');
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});
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await scenario('isPrivateIp: fc00::1 → private (ULA)', () => {
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assertEqual(isPrivateIp('fc00::1'), true, 'expected private');
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});
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await scenario('isPrivateIp: fe80::1 → private (link-local IPv6)', () => {
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assertEqual(isPrivateIp('fe80::1'), true, 'expected private');
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});
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await scenario('isPrivateIp: ::ffff:127.0.0.1 → private (IPv4-mapped IPv6 of loopback)', () => {
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assertEqual(isPrivateIp('::ffff:127.0.0.1'), true, 'expected private (unwrap)');
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});
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await scenario('isPrivateIp: ::ffff:10.0.0.1 → private (IPv4-mapped of RFC1918)', () => {
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assertEqual(isPrivateIp('::ffff:10.0.0.1'), true, 'expected private (unwrap)');
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});
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await scenario('isPrivateIp: ::ffff:169.254.169.254 → private (IPv4-mapped of AWS metadata)', () => {
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assertEqual(isPrivateIp('::ffff:169.254.169.254'), true, 'expected private (unwrap)');
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});
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await scenario('isPrivateIp: ::FFFF:127.0.0.1 → private (case-insensitive IPv4-mapped)', () => {
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assertEqual(isPrivateIp('::FFFF:127.0.0.1'), true, 'expected private');
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});
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await scenario('isPrivateIp: 8.8.8.8 → public', () => {
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assertEqual(isPrivateIp('8.8.8.8'), false, 'expected public');
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});
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await scenario('isPrivateIp: 203.0.113.1 → public (TEST-NET-3 documentation)', () => {
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assertEqual(isPrivateIp('203.0.113.1'), false, 'expected public');
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});
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await scenario('isPrivateIp: 2001:db8::1 → public (TEST-NET-3 IPv6 documentation)', () => {
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assertEqual(isPrivateIp('2001:db8::1'), false, 'expected public');
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});
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await scenario('isPrivateIp: 2606:4700::1 → public (Cloudflare anycast)', () => {
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assertEqual(isPrivateIp('2606:4700::1'), false, 'expected public');
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});
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// ─── Layer 1 + Layer 2 interactions ──────────────────────────────
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await scenario('layered defense: hostname check catches before IP check (private literal)', () => {
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// If the URL itself contains a private hostname (literal), layer 1
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// fires before any DNS work. This is the cheap path that doesn't
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// require DNS access. Verify by checking the function directly.
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assertEqual(isPrivateHostname('127.0.0.1'), true, 'layer 1 catches direct literal');
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// And the same address passes through layer 2 (isPrivateIp) too.
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assertEqual(isPrivateIp('127.0.0.1'), true, 'layer 2 would also catch if reached');
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});
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console.log('');
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if (failures > 0) {
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console.log('──────────────────────────────────────────────────────');
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console.log(`✗ ${failures}/${scenarios} scenarios failed`);
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process.exit(1);
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}
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console.log(`──────────────────────────────────────────────────────`);
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console.log(`✓ all ${scenarios} scenarios passed`);
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