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@advance-labs/net-guard

v0.2.2

Published

SSRF-guarded HTTP fetch seam — DNS-resolves and rejects private/loopback/link-local/CGNAT/cloud-metadata addresses, re-validates every redirect hop, caps body size and time, and host-pins to defeat DNS rebinding.

Vulnerabilities

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Links

Git

Maintainers

zordhalozordhalo

Keywords

ssrfsecurityfetchhttpdns-rebindingurl-validationallowlist

Readme

@advance-labs/net-guard

SSRF-guarded HTTP fetch seam. Closes finding C1 of the Autopilot security review: the existing crawler/backlinks HTTP layer follows redirects with no private-IP guard, so a user-supplied URL can reach 169.254.169.254 (cloud metadata), localhost, or RFC-1918 hosts.

Use it for any untrusted URL

import { safeFetch, createLiveSafeFetchDeps } from '@advance-labs/net-guard';

const deps = createLiveSafeFetchDeps();
const res = await safeFetch('https://prospect.example/', {}, deps);
if (!res.ok) {
  // res.blockedReason: 'scheme-not-allowed' | 'private-address' | 'dns-resolution-failed'
  //                  | 'too-many-redirects' | 'body-too-large' | 'timeout'
}

What it guards (in order)

  1. Scheme allowlist — http: / https: only (rejects file:, gopher:, …).
  2. DNS resolve + private-address rejection — refuses if any resolved IP is loopback, RFC-1918, link-local (incl. the metadata IP), CGNAT, IPv6 ULA/link-local, or an IPv4-mapped private address. Malformed addresses fail closed.
  3. Per-hop redirect re-validation — redirects are manual; the full check re-runs on every target, so a public host can't 302 you to an internal one.
  4. Body + time caps — maxBodyBytes (default 2 MB) and timeoutMs (default 10 s, aborts the request).

All logic is pure and injected (resolve, fetchImpl) — unit-tested with zero network. See docs/CONVENTIONS.md security invariant #1.