mirror of
https://github.com/bulwarkmail/webmail.git
synced 2026-11-01 00:13:37 +00:00
Linus Rath
4bbcf9cdd7
The telemetry sender and the Stalwart version probe checked the target with their own DNS lookup and then fetched with a plain `fetch`, which resolved the name again: a rebinding answer between the two reached an internal host, and a lookup that failed at check time passed the check outright. Both now connect through `fetchPublicUrl`, which validates the address inside the socket's own lookup and fails when the lookup does. The `BULWARK_TELEMETRY_ALLOW_PRIVATE` dev bypass keeps the plain fetch.
43 lines
1.8 KiB
TypeScript
43 lines
1.8 KiB
TypeScript
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
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// The telemetry sender checked the endpoint with its own DNS lookup, then
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// fetched with a plain fetch that resolved again (a rebinding window), and
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// the check passed outright when that first lookup failed.
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const guardedFetch = vi.fn();
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vi.mock('@/lib/security/url-guard', async (importOriginal) => {
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const actual = await importOriginal<typeof import('@/lib/security/url-guard')>();
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return { ...actual, fetchPublicUrl: (...args: unknown[]) => guardedFetch(...args) };
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});
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const plainFetch = vi.fn();
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beforeEach(() => {
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guardedFetch.mockReset().mockResolvedValue(new Response('ok'));
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plainFetch.mockReset().mockResolvedValue(new Response('ok'));
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vi.stubGlobal('fetch', plainFetch);
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delete process.env.BULWARK_TELEMETRY_ALLOW_PRIVATE;
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});
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afterEach(() => {
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vi.unstubAllGlobals();
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vi.resetModules();
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});
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describe('fetchTelemetryTarget', () => {
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it('connects through the rebinding-safe fetch', async () => {
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const { fetchTelemetryTarget } = await import('@/lib/telemetry/endpoint-guard');
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await fetchTelemetryTarget('https://telemetry.example.org/', { method: 'POST', body: '{}' });
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expect(guardedFetch).toHaveBeenCalledWith('https://telemetry.example.org/', { method: 'POST', body: '{}' });
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expect(plainFetch).not.toHaveBeenCalled();
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});
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it('uses the plain fetch only with the dev bypass, still without redirects', async () => {
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process.env.BULWARK_TELEMETRY_ALLOW_PRIVATE = '1';
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const { fetchTelemetryTarget } = await import('@/lib/telemetry/endpoint-guard');
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await fetchTelemetryTarget('http://localhost:4000/', { method: 'GET' });
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expect(plainFetch).toHaveBeenCalledWith('http://localhost:4000/', { method: 'GET', redirect: 'manual' });
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expect(guardedFetch).not.toHaveBeenCalled();
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});
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});
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