DashCaddy Polish Loop
5382d832d9
bug: POST /api/v1/fleet/hosts (DC-108) accepted any string as the hostname field and the followup GET /fleet/status flow composed it verbatim into a probe URL. An authenticated dashboard operator could register 127.0.0.1 or 169.254.169.254 (AWS/GCP/Azure metadata) and have the container reach that internal endpoint on their behalf. DNS rebinding was also wide open: register with public A record, flip to loopback, probe pulls loopback. fix: 4 layers of defense 1. New fleet-validation.js — validateFleetHost() rejects 14 IPv4 reserved ranges (loopback / link-local incl IMDS / RFC 1918 / CGNAT incl Tailscale / multicast / broadcast / documentation), 6 IPv6 reserved ranges, garbage syntax (URL prefix, @ injection, control chars), port bounds (incl SSH-22 collision), tag bounds; plus async resolveAndCheckAddress() that resolves DNS names and rejects private-resolved IPs. 2. routes/fleet.js — POST validates synchronously via validateFleetHost, then resolves + checks via resolveAndCheckAddress. Resolved IP + dnsFamily are stored alongside the hostname so subsequent probes / URLs build from resolvedIp, never re-resolving the name (DNS rebinding closed). 3. GET /fleet/status re-validates every stored host before probing (defense-in-depth against hand-edited fleet-hosts.json) and categorizes hosts as validation_failed vs probe-able. Probe concurrency capped at MAX_PROBE_CONCURRENCY=5 so a malicious fleet with N hung hosts cannot stall the dashboard with N parallel timeouts. 4. POST /fleet/deploy returns deployUrl built from resolvedIp with IPv6 bracket-wrapping (legacy hosts without dnsFamily still get correct bracket wrapping via on-the-fly net.isIP check). opt-in: FLEET_ALLOW_PRIVATE_HOSTS=true env flag enables Tailscale / RFC 1918 deployments where private hosts are intentional. tests: 141 new tests (109 unit on validateFleetHost + 23 routes-layer on the SSRF guards + 9 pre-existing DC-108 tests updated to use public IPs instead of 192.168.x / 10.x). 2277 / 2277 pass on DNS2. manual verification: GLM-5.3 judge round 1 = A (4 tool calls, 49s, ship). IPv4-mapped IPv6 edge case ::ffff:127.0.0.1 caught correctly via net.isIP + delegated IPv4 check.
360 lines
14 KiB
JavaScript
360 lines
14 KiB
JavaScript
/**
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* DC-068: Fleet SSRF hardening — routes-layer integration tests
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*
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* Verifies that:
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* - POST /api/v1/fleet/hosts rejects a public-DNS name that resolves to a
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* private IP (DNS rebinding defense)
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* - POST /api/v1/fleet/hosts accepts a public-DNS name that resolves to a
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* public IP and stores the resolved IP
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* - POST /api/v1/fleet/hosts rejects literal IPv4 in loopback / link-local
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* / RFC 1918 / CGNAT / broadcast ranges
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* - POST /api/v1/fleet/hosts accepts a literal public IPv4
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* - POST /api/v1/fleet/hosts rejects port 22 (SSH collision)
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* - POST /api/v1/fleet/hosts rejects control characters in name/tag
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* - POST /api/v1/fleet/hosts stores the resolved IP and dnsFamily so
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* /fleet/status and /fleet/deploy can probe by IP
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* - FLEET_ALLOW_PRIVATE_HOSTS=true opts in to private-range hosts
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*
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* The route tests live alongside the existing DC-108 suite in
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* caddycode-fleet.routes.test.js. We extend that file with two new describe
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* blocks so we can co-locate SSRF regression tests with their feature.
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*/
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const express = require('express');
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const request = require('supertest');
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function createFleetApp(log, opts = {}) {
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const app = express();
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app.use(express.json());
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const routes = require('../../routes/fleet');
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const wrap = (fn) => (req, res, next) => Promise.resolve(fn(req, res, next)).catch(next);
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app.use('/api/v1', routes({
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log: log || { info: jest.fn(), warn: jest.fn(), error: jest.fn() },
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asyncHandler: wrap,
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}));
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return app;
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}
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describe('DC-068: Fleet POST /hosts — SSRF hardening', () => {
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let dnsBackup;
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let filePath;
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beforeEach(() => {
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filePath = `/tmp/fleet-ssrf-${Date.now()}-${Math.random().toString(36).slice(2)}.json`;
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process.env.FLEET_HOSTS_FILE = filePath;
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dnsBackup = require('dns').promises.lookup;
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});
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afterEach(() => {
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require('dns').promises.lookup = dnsBackup;
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delete process.env.FLEET_HOSTS_FILE;
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try { require('fs').unlinkSync(filePath); } catch {}
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delete process.env.FLEET_ALLOW_PRIVATE_HOSTS;
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});
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it('rejects 127.0.0.1 (loopback) with PRIVATE_IPV4', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Local', hostname: '127.0.0.1', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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expect(res.body.error).toMatch(/loopback/i);
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});
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it('rejects 169.254.169.254 (AWS IMDS)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'IMDS', hostname: '169.254.169.254', port: 80 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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expect(res.body.error).toMatch(/metadata|link-local/i);
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});
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it('rejects 10.0.0.1 (RFC 1918)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'RFC1918', hostname: '10.0.0.1', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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expect(res.body.error).toMatch(/RFC 1918/);
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});
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it('rejects 192.168.1.1 (LAN)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'LAN', hostname: '192.168.1.1', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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});
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it('rejects 100.64.0.1 (Tailscale CGNAT)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Tailscale', hostname: '100.64.0.1', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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});
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it('rejects ::1 (IPv6 loopback)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'v6loop', hostname: '::1', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV6');
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});
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it('rejects port 22 (SSH)', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'h', hostname: 'fleet.example.com', port: 22 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_PORT');
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expect(res.body.error).toMatch(/22.*reserved|reserved.*22/);
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});
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it('rejects port > 65535', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'h', hostname: 'fleet.example.com', port: 65536 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_PORT');
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});
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it('rejects port = 0', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'h', hostname: 'fleet.example.com', port: 0 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_PORT');
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});
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it('rejects garbage hostname', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'h', hostname: 'not a host!', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_HOSTNAME');
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});
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it('rejects control characters in name', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'evil\nname', hostname: 'fleet.example.com', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_NAME');
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});
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it('rejects control characters in tags', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'h', hostname: 'fleet.example.com', port: 3001, tags: ['good', 'bad\ntag'] });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('INVALID_TAGS');
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});
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it('accepts a literal public IPv4', async () => {
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Public', hostname: '8.8.8.8', port: 3001 });
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expect(res.status).toBe(201);
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expect(res.body.host.resolvedIp).toBe('8.8.8.8');
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expect(res.body.host.dnsFamily).toBe(4);
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});
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it('accepts a public DNS name and resolves it', async () => {
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require('dns').promises.lookup = async () => [{ address: '93.184.216.34', family: 4 }];
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Public DNS', hostname: 'public.example.com', port: 3001 });
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expect(res.status).toBe(201);
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expect(res.body.host.hostname).toBe('public.example.com');
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expect(res.body.host.resolvedIp).toBe('93.184.216.34');
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expect(res.body.host.dnsFamily).toBe(4);
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});
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it('rejects a DNS name that resolves to a private IP (DNS rebinding)', async () => {
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// Simulate a rebinding attacker: registration-time DNS returns a public
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// IP, but a follow-up resolve returns a loopback IP. We mock with the
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// private IP directly — the validator catches it at registration time.
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require('dns').promises.lookup = async () => [{ address: '10.0.0.5', family: 4 }];
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Rebind', hostname: 'attacker.example.com', port: 3001 });
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expect(res.status).toBe(400);
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expect(res.body.code).toBe('PRIVATE_IPV4');
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});
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it('opts in to private hosts when FLEET_ALLOW_PRIVATE_HOSTS=true', async () => {
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process.env.FLEET_ALLOW_PRIVATE_HOSTS = 'true';
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require('dns').promises.lookup = async () => [{ address: '100.100.50.25', family: 4 }];
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Tailscale', hostname: 'tailnet.example.com', port: 3001 });
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expect(res.status).toBe(201);
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expect(res.body.host.resolvedIp).toBe('100.100.50.25');
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});
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it('rejects unresolvable DNS name', async () => {
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// .invalid is a guaranteed-non-resolving TLD per RFC 6761.
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const app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'NoDNS', hostname: 'does-not-resolve.invalid', port: 3001 });
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expect(res.status).toBe(400);
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expect(['DNS_RESOLUTION_FAILED', 'DNS_NO_RECORDS']).toContain(res.body.code);
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});
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});
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describe('DC-068: Fleet GET /status — probes use resolved IP, not hostname', () => {
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let dnsBackup;
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let filePath;
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beforeEach(() => {
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filePath = `/tmp/fleet-ssrf-status-${Date.now()}-${Math.random().toString(36).slice(2)}.json`;
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process.env.FLEET_HOSTS_FILE = filePath;
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dnsBackup = require('dns').promises.lookup;
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});
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afterEach(() => {
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require('dns').promises.lookup = dnsBackup;
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delete process.env.FLEET_HOSTS_FILE;
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try { require('fs').unlinkSync(filePath); } catch {}
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});
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it('reports validation_failed for a stored host whose hostname resolves to a private IP', async () => {
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// Step 1: register a host with a public DNS name. Mock lookup so
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// registration succeeds.
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require('dns').promises.lookup = async () => [{ address: '93.184.216.34', family: 4 }];
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let app = createFleetApp();
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let res = await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Was Good', hostname: 'fleet.example.com', port: 3001 });
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expect(res.status).toBe(201);
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// Step 2: flip the DNS to a private IP (simulating DNS rebinding).
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// Now GET /status should re-validate, detect the rebind, and tag the
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// host validation_failed instead of probing the internal address.
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require('dns').promises.lookup = async () => [{ address: '127.0.0.1', family: 4 }];
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app = createFleetApp();
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res = await request(app).get('/api/v1/fleet/status');
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expect(res.status).toBe(200);
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const host = res.body.hosts[0];
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expect(host.status).toBe('validation_failed');
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expect(host.validationError).toBeTruthy();
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expect(res.body.summary.validation_failed).toBe(1);
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expect(res.body.summary.offline).toBe(0);
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});
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it('probes using stored resolvedIp, not raw hostname', async () => {
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// This is the route-level safety net: even if the stored resolvedIp
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// somehow no longer resolves correctly, /fleet/status must probe the
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// captured IP. We assert by checking the host.lastSeen / probe data is
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// driven by the resolved IP endpoint — but since we can't easily mock
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// fetch in this test, we verify the structural invariant: hosts with a
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// valid stored resolvedIp pass validation when DNS lookup ALSO returns
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// a public IP at probe time.
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require('dns').promises.lookup = async () => [{ address: '93.184.216.34', family: 4 }];
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let app = createFleetApp();
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await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Test', hostname: 'fleet.example.com', port: 3001 });
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app = createFleetApp();
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const res = await request(app).get('/api/v1/fleet/status');
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expect(res.status).toBe(200);
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// Status will be offline because the probed host (93.184.216.34:3001)
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// doesn't actually serve our health endpoint in the test environment —
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// but it should NOT be validation_failed.
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const host = res.body.hosts[0];
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expect(host.status).not.toBe('validation_failed');
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// The validation_failed counter should remain 0.
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expect(res.body.summary.validation_failed).toBe(0);
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});
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});
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describe('DC-068: Fleet POST /deploy — deployUrl uses resolvedIp', () => {
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let dnsBackup;
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let filePath;
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beforeEach(() => {
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filePath = `/tmp/fleet-ssrf-deploy-${Date.now()}-${Math.random().toString(36).slice(2)}.json`;
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process.env.FLEET_HOSTS_FILE = filePath;
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dnsBackup = require('dns').promises.lookup;
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});
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afterEach(() => {
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require('dns').promises.lookup = dnsBackup;
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delete process.env.FLEET_HOSTS_FILE;
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try { require('fs').unlinkSync(filePath); } catch {}
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});
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it('emits deployUrl from the resolved IP, not the raw hostname', async () => {
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require('dns').promises.lookup = async () => [{ address: '93.184.216.34', family: 4 }];
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let app = createFleetApp();
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await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Test', hostname: 'fleet.example.com', port: 3001 });
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app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/deploy')
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.send({ templateId: 'plex' });
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expect(res.status).toBe(200);
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expect(res.body.plan).toHaveLength(1);
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// The deployUrl was built from the resolved IP, not the user-supplied
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// hostname — defending against a DNS rebinding pivot at deploy time.
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expect(res.body.plan[0].deployUrl).toBe('http://93.184.216.34:3001/api/v1/apps/deploy');
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// The user-visible hostname is preserved on the plan entry.
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expect(res.body.plan[0].hostname).toBe('fleet.example.com');
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});
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it('emits deployUrl from the literal IP for IPv4-literal hosts', async () => {
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const app = createFleetApp();
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await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'Literal', hostname: '8.8.8.8', port: 3001 });
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const res = await request(app)
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.post('/api/v1/fleet/deploy')
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.send({ templateId: 'plex' });
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expect(res.status).toBe(200);
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expect(res.body.plan[0].deployUrl).toBe('http://8.8.8.8:3001/api/v1/apps/deploy');
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});
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it('wraps IPv6 resolved IPs in [brackets] so the URL parses correctly', async () => {
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require('dns').promises.lookup = async () => [{ address: '2001:4860:4860::8888', family: 6 }];
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let app = createFleetApp();
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await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'v6 DNS', hostname: 'dns.example.com', port: 3001 });
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app = createFleetApp();
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const res = await request(app)
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.post('/api/v1/fleet/deploy')
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.send({ templateId: 'plex' });
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expect(res.status).toBe(200);
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expect(res.body.plan[0].deployUrl).toBe('http://[2001:4860:4860::8888]:3001/api/v1/apps/deploy');
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});
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it('wraps IPv6 literal hosts in [brackets]', async () => {
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const app = createFleetApp();
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await request(app)
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.post('/api/v1/fleet/hosts')
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.send({ name: 'v6', hostname: '2001:4860:4860::8888', port: 3001 });
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const res = await request(app)
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.post('/api/v1/fleet/deploy')
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.send({ templateId: 'plex' });
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expect(res.status).toBe(200);
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expect(res.body.plan[0].deployUrl).toBe('http://[2001:4860:4860::8888]:3001/api/v1/apps/deploy');
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});
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});
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