Login/PoW/POST traffic to the outpost URL space cannot solve a fresh PoW
challenge per request; exempt the transport prefix (authentik's own session
gate still protects it) so the guarded-host sign-in journey completes.
The pinned binary's policy parser rejects unknown actions and exits 1 on
startup (verified against the image binary: the valid action literals are
ALLOW, CHALLENGE, DENY). The first cut of the own-endpoints accept rule
used ACCEPT and crash-looped the unit on deploy.
The catch-all path_regex "." policy challenged everything, including
Anubis's own API namespace /.within.website/x/cmd/anubis/*
(make-challenge, pass-challenge, static assets). In whole-request proxy
mode a JS-capable browser POSTs its challenge solution to
pass-challenge and received another challenge page (HTML) instead of the
verification verdict (JSON): the challenge app's fetch failed and the
browser rendered its own error — 'the request filters did not return an
alternative response'. Non-JS clients never POST the solution, so every
curl probe looked green while every human hit a wall.
Accept rule ordered above the catch-all; policy is volume-mounted ro from
this checkout, so the deploy updates it in place.
Bots and AI scrapers hit the SSO-fronted vhosts and eat Authentik auth
work for 403s. Anubis verifies clients first: DENY for known AI scraper
UAs, JS challenge for everyone else; verified traffic resumes the normal
Authentik forward_auth chain on Caddy's internal listener (:8016).
Chain: client -> Caddy (TLS) -> Anubis :8923 (verify) -> Caddy :8016
(auth + routing resumes; Host survives both hops) -> app. Reverse-proxy
through Anubis, not forward_auth: at the pinned tag a CHALLENGE answers
HTTP 200 + HTML, and forward_auth treats 200 as "authenticated" — the
page would pass through unchallenged. Exempt by construction (never
routed through Anubis): plex (plain HTTP legacy), auth.* (IdP login
must be reachable ungated), gitea (git smart-HTTP clients cannot solve
JS challenges), and every app with its own login.
Pinned ghcr.io/TecharoHQ/anubis:v1.13.0 — the tag was source-verified
before pinning: at this tag the policy parser is JSON-only with a
minimal bots[] schema (no imports, no CEL expressions), flags are the
config surface via flagenv (TARGET/POLICY_FNAME map to --target/
--policy-fname), and the image's exec-form HEALTHCHECK is inherited by
the quadlet unit (dodges the v1 generator's HealthCmd space-split quirk).
Rollback nuance: stopping anubis 502s everything behind the chain (the
public listeners proxy through it); a true rollback is reverting the
Caddyfile and redeploying, not just systemctl --user stop anubis.
Frank