cf-access-wall — declarative Access provisioning

Zero Trust free tier covers 50 seats; Access attaches directly to *.workers.dev hostnames (verified live 2026-07-23 — no zone, no domain purchase). One Access app offers BOTH login paths on a single screen: GitHub for developers, emailed 6-digit code for non-technical staff (no account creation). Enforcement is real: unauthenticated requests 302 to the team login page.

Self-Evolving Skill: Cloudflare's API/dashboard drift → fix scripts + the dashboard-forge Vendor Quirks log immediately on real breakage.

Flow

1. Spec — write <project>/…/access-spec.json against schema/access-spec.schema.json. The spec lives in the PROJECT repo (it carries team emails); this skill stays agnostic.
2. Scoped token (once per account) — the existing account token usually lacks Access scopes and cannot grant itself more. Forge one via the dashboard-forge method (sibling skill): human logs into dash.cloudflare.com in the automation Chrome; drive Manage Account → Account API Tokens → Edit on Access, Access: Identity Providers, Access: Organizations, Access: Service Tokens; DOM-extract → vault set --stdin <scope> cf.api_token. Account-token gotcha: verify with /accounts/{id}/tokens/verify (the /user/… endpoint always rejects account-owned tokens).
3. GitHub OAuth app (if the GitHub path is wanted) — node scripts/gh-oauth-app.mjs --name <app> --callback https://<team>.cloudflareaccess.com/cdn-cgi/access/callback --expect-account <owner> --vault-scope <scope> The --expect-account identity preflight is mandatory doctrine (wrong-owner incident, 2026-07-23). Create the app right after a fresh login to ride the sudo grace window.
4. Provision — node scripts/setup-access.mjs <spec.json> — idempotent (GET-before-POST), safe to re-run after every spec edit; pre-existing orgs/idps/apps are adopted, not overwritten.
5. Verify enforcement — curl -s -o /dev/null -w '%{http_code}' https://<host>/ → expect 302; then a service-token request → expect 200: curl -H "CF-Access-Client-Id: $ID" -H "CF-Access-Client-Secret: $SECRET" …

Design rules (learned in production)

• Session lengths are a safety feature: field-device apps (a chairside recorder, a kiosk) get the 730h maximum so an in-field link NEVER re-auths mid-task; reading material gets days.
• Allow-list every identity a person may arrive with — GitHub asserts the account's verified email, OTP asserts the typed one; a person with two emails needs both listed.
• Machine paths stay off the wall: anything with its own end-to-end auth (signed upload tokens, webhook receivers, machine-consumed feeds) must NOT sit behind Access — a browser login wall on a non-browser client is an outage. Wall the page, not the pipe.
• Service workers + Access: a PWA behind Access must never cache redirected/non-OK responses (res.redirected || !res.ok → don't cache) or the login page poisons the app shell. Bump the SW cache name when adding the wall (purges anything cached pre-guard).
• CLI/CI clients get a service token + non_identity policy; send CF-Access-Client-Id/Secret headers IN ADDITION to any app-level auth.
• Public-by-design sites (career portals, feeds) are explicitly out of spec — list what you deliberately did NOT wall in the project's decision record.

Reference implementations

• A private client repo's scripts/access-bootstrap/ + that repo's compliance README §D10 (2026-07-23: client CF org, two workers.dev apps, OTP+GitHub, a CLI service token).
• eonfleet (eon.ccmax.uk, April 2026): GitHub-SSO-only variant on a custom domain (ccmax-monitor repo: production/cloudflare_access_jwt_verifier.py for server-side JWT verification when the origin must double-check).

Post-Execution Reflection

After this skill completes, check before closing:

1. Did Cloudflare API calls succeed? — If not, verify the scope-token has Access permissions and the account ID is correct.
2. Is authentication enforced on the deployed URLs? — Unauthenticated requests must 302 to the login page; service-token requests must succeed.
3. Did the spec match the actual deployment? — If Cloudflare's API/dashboard drifted, update the reference scripts and this skill's documentation.