browser-auth-flow
Probe a site's authentication flow for redirect leaks, missing CSRF, weak session cookies, and OAuth misconfiguration; produces an auth findings.md
What this skill does
# Browser Auth Flow Adversarial probe of a site's authentication. Drives the login flow once, records the trajectory, then runs a configurable set of probes against the captured artifacts and live page. Output is a structured `findings.md` inside the RVF container. ## When to use - Pre-deployment audit of a new auth flow. - Investigating a suspected token leak or redirect issue. - Establishing a baseline for ongoing regression checks. ## Steps 1. **Open a recorded session** via `browser-record`. 2. **Drive the auth flow** as in `browser-login` (credentials come from `--credentials <handle>` referencing `browser-cookies` if the run is a re-auth probe). 3. **Run probes**: - **`csrf`**: inspect the login POST in the trajectory; verify a same-origin token field is present and non-empty. - **`redirect`**: watch `browser_get-url` after each nav for cross-origin redirects with auth state in the URL or fragment. Flag any token-bearing URL that crosses an origin boundary. - **`cookie`**: walk `document.cookie` via `browser_eval`. For each cookie, check `Secure`, `HttpOnly`, `SameSite`, expiry, and entropy of the value. Flag missing flags or short tokens. Pass each through `aidefence_scan` to flag PII embedded in cookie values. - **`oauth`**: if the flow involves a third-party provider, capture the authorization request, verify `state` and `nonce` are present and high-entropy, verify `redirect_uri` matches the registered callback domain. 4. **Quarantine** any token / credential / PII captured during probing — it stays inside the RVF container's findings, never returns to the model unredacted (`aidefence_is_safe` gate from `browser-extract` applies if you read the findings back). 5. **Write `findings.md`** with one section per probe, severity rating per finding, and a `verdict` (pass / warn / fail). 6. **Index** the session in `browser-sessions` with `tag: auth-probe` so future audits compare against it. ## Caveats - This skill probes; it does not exploit. Do not chain follow-up requests using a captured token. - Credentials must come from a vaulted handle or interactive entry. Never hardcode them in the field map. - Some probes require multiple page loads. Trajectory step count for an auth probe typically lands at 15–40 steps; budget accordingly. - The output is structured for human review. Do not auto-act on findings without surfacing them to the user first.
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