Writes passwords.dex.coreos.com CRs against the in-cluster Kubernetes
API using the pod's service-account token + cluster CA (no kubectl /
client-go dependency). NewPasswordClient returns ErrNotInCluster off
cluster so the web layer degrades gracefully in dev.
Load-bearing: Dex's kubernetes storage types Password.Hash as []byte,
which k8s JSON-marshals as base64 — so the `hash` field carries the
base64 of the bcrypt string, not the raw string. Storing the raw string
makes Dex's base64-decode-on-login produce garbage and every login fail.
409 -> ErrPasswordExists, 401/403 -> ErrForbidden (RBAC missing) so the
handler can give precise messages. Tested against an httptest TLS server.
bcrypt cost-12 hashing lives in the web handler; golang.org/x/crypto was
already a transitive dep (now promoted in go.sum).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
mathiasandClaude Opus 4.8
e44485df16