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k8s-manifests/n8n/rbac-restarter.yaml
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chemavxandClaude Opus 5 50f090bbea Cerrar el auto-reinicio: fail-closed, permisos por nombre y fallo visible 
Tres agujeros que encontro una review adversarial de Codex sobre el trabajo
de ayer. Los tres verificados contra el fichero antes de tocar nada.

1. El webhook publico fallaba en ABIERTO. Con `optional: true` y un
   `if (secreto && ...)`, la ausencia del secreto equivalia a autorizacion:
   cualquier POST con heartbeat.status=0 y un monitor.name del mapa reiniciaba
   n8n, Gitea, ArgoCD, Vaultwarden o los blogs. El argumento para dejarlo asi
   era "que un despiste no te deje sin avisos", y era falso: el aviso de caida
   lo manda Kuma por su notificacion 1, directa, no por este webhook.
   Ahora el secreto es obligatorio (sin `optional`) y la puerta rechaza si
   falta. Secreto ausente da error ruidoso; cabecera que no casa, vacio.

2. El ClusterRole permitia patch sobre CUALQUIER deployment de 10 namespaces,
   y la SA va montada en el pod entero de n8n: cualquier workflow con un nodo
   Code heredaba eso. Ahora son Roles por namespace con resourceNames sobre
   los 12 workloads exactos del SERVICE_MAP.

3. El flujo daba exito aunque el PATCH fallara. `restartOk` se calculaba y se
   tiraba: `K8s API Check Status` construia un objeto nuevo sin el, y el IF
   final solo miraba `statusOk`. Un 403 sobre un servicio ya sano mandaba
   "reiniciado correctamente". Ahora hay rama de fallo tras el PATCH y el
   exito exige observedGeneration >= la generation que devolvio el PATCH.
   Se compara con >= porque selfHeal de ArgoCD revierte la anotacion y vuelve
   a subir la generation; con == daria un fallo falso.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-07-31 08:02:07 +00:00

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# Permisos para el workflow "Uptime Kuma -> K8s Auto-Restart" (2026-07-30,
# acotado el 2026-07-31 tras una review adversarial de Codex).
#
# El nodo Code lee el token proyectado de la ServiceAccount y hace un PATCH
# contra kubernetes.default.svc. Nunca habia existido ningun Role ni RoleBinding
# para n8n: el API devolvia 403 y el workflow se iba por la rama de "reinicio
# fallido". Los 23 "exitos" de workflow_statistics eran eso -- el aviso de fallo
# enviandose bien. La integracion jamas reinicio nada.
#
# SA propia y no la "default" del namespace: cualquier pod que se despliegue en
# n8n sin pedir SA hereda la default, y estos permisos cruzan namespaces.
#
# ⚠️ Esta SA va montada en el pod ENTERO de n8n, no solo en este workflow: los
# nodos Code leen el token de /var/run/secrets/..., asi que CUALQUIER workflow
# con un nodo Code hereda lo que aqui se conceda. Por eso el permiso no es
# "deployments del namespace" sino resourceNames con los 12 workloads EXACTOS
# del SERVICE_MAP. Si se anade un servicio al mapa, hay que anadirlo aqui o
# dara 403 -- deliberado: que el mapa y el permiso se muevan juntos.
#
# Antes habia un ClusterRole sin resourceNames + un RoleBinding por namespace.
# Eso permitia reiniciar CUALQUIER deployment de esos 10 namespaces. Ahora son
# Roles por namespace, cada uno con su lista cerrada.
apiVersion: v1
kind: ServiceAccount
metadata:
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: n8n
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["n8n"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: n8n
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: monitoring
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["kube-prometheus-stack-grafana", "uptime-kuma"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: monitoring
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: homarr
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["homarr"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: homarr
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: gitea
rules:
- apiGroups: ["apps"]
resources: ["statefulsets"]
resourceNames: ["gitea"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: gitea
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: authentik
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["authentik-server"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: authentik
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: vaultwarden
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["vaultwarden"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: vaultwarden
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: ollama
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["ollama"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: ollama
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: ghost-en
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["ghost-en"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: ghost-en
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: zona-exclusion
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["zona-exclusion"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: zona-exclusion
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: n8n-restarter
namespace: argocd
rules:
- apiGroups: ["apps"]
resources: ["deployments"]
resourceNames: ["argocd-repo-server", "argocd-server"]
verbs: ["get", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: n8n-restarter
namespace: argocd
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: n8n-restarter
subjects:
- kind: ServiceAccount
name: n8n-restarter
namespace: n8n
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