audit-core/deploy/attest-cronjob.yaml

# Chain-head attestation on a schedule (AUDIT-WP-0009-T02).
#
# T01 made `tamper_evidence` conditional on a fresh attestation. Until this
# runs, the honest answer in production is `false` — the precondition is simply
# not met. This is the job that meets it.
#
# WHERE THE ATTESTATION GOES, AND WHY IT MATTERS MORE THAN THE SCHEDULE.
# An attestation is worth exactly as much as its independence from the thing it
# attests. Two copies, with different properties, and neither is optional:
#
#   1. ConfigMap `audit-core-chain-head`, in-cluster, written here and mounted
#      read-only by the Deployment. Outside platform-pg, so a database owner
#      who rewrites a suffix cannot also rewrite the attestation without
#      separate cluster access. This is the copy the receiver reads and the one
#      that makes /readyz truthful.
#
#   2. The logical-offsite copy (rapp-postgres / Nextcloud + age, the path
#      RESOURCE-WP-0002-T06 already uses). Survives loss of the cluster. This
#      job does NOT write it — audit-core holds no Nextcloud credential and
#      should not — so it remains an operator step, recorded in
#      docs/integrity.md.
#
# NOT the Barman prefix. A copy restored alongside the table proves nothing:
# whoever rewrote the table restores the attestation that matches it.
#
# So copy 1 alone is a real but bounded control: it defends against a database
# owner, not against a cluster owner. docs/integrity.md states that bound; do
# not let this file be read as delivering more.
#
# Image digest must match deploy/audit-core.yaml.
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: audit-core-attest
  namespace: audit-core
  labels:
    app.kubernetes.io/name: audit-core
    app.kubernetes.io/component: attest
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: audit-core-attest
  namespace: audit-core
rules:
  # One named ConfigMap, in this namespace, and no `create` on the collection.
  # The ConfigMap is created once by the operator; this job may only replace
  # its contents. Deliberately not `list` — a job that can enumerate the
  # namespace's ConfigMaps has more reach than writing one head needs.
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["audit-core-chain-head"]
    verbs: ["get", "update", "patch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: audit-core-attest
  namespace: audit-core
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: audit-core-attest
subjects:
  - kind: ServiceAccount
    name: audit-core-attest
    namespace: audit-core
---
apiVersion: batch/v1
kind: CronJob
metadata:
  name: audit-core-attest-chain
  namespace: audit-core
  labels:
    app.kubernetes.io/name: audit-core
    app.kubernetes.io/component: attest
spec:
  # Daily, against the 168h freshness window declared in docs/integrity.md.
  # Seven cadences of headroom on purpose: a missed run degrades the claim
  # gradually rather than flapping tamper_evidence false on one bad night.
  schedule: "17 3 * * *"
  timeZone: Etc/UTC
  concurrencyPolicy: Forbid
  startingDeadlineSeconds: 3600
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 7
  jobTemplate:
    spec:
      backoffLimit: 2
      ttlSecondsAfterFinished: 172800
      template:
        metadata:
          labels:
            app.kubernetes.io/name: audit-core
            app.kubernetes.io/component: attest
        spec:
          restartPolicy: OnFailure
          serviceAccountName: audit-core-attest
          securityContext:
            runAsNonRoot: true
            runAsUser: 10001
            fsGroup: 10001
            seccompProfile:
              type: RuntimeDefault
          containers:
            - name: attest
              image: forgejo.coulomb.social/coulomb/audit-core@sha256:c82e0442de0fd181342916ae9cd5d6de41d859e1efda637bd93936c67873afa5
              imagePullPolicy: IfNotPresent
              command:
                - python
                - -m
                - audit_core.attest_publish
              # attest_publish runs `attest-chain`, refuses to publish over a
              # broken chain, and PATCHes the ConfigMap through the API with
              # the projected ServiceAccount token. Written in stdlib rather
              # than shelling out because this image carries no kubectl, and
              # adding one to an audit receiver's image to write one file is a
              # worse trade than twenty lines of urllib.
              env:
                - name: AUDIT_CORE_CREDENTIAL_DIR
                  value: /etc/audit-core/db
                - name: AUDIT_CORE_DATABASE_SCHEMA
                  value: audit_core
                # Read-only work: never migrate from the attestation job.
                - name: AUDIT_CORE_AUTO_MIGRATE
                  value: "0"
              resources:
                requests: {cpu: 50m, memory: 64Mi}
                limits: {cpu: 500m, memory: 256Mi}
              securityContext:
                allowPrivilegeEscalation: false
                capabilities:
                  drop: ["ALL"]
                readOnlyRootFilesystem: true
              volumeMounts:
                - name: tmp
                  mountPath: /tmp
                - name: database-credential
                  mountPath: /etc/audit-core/db
                  readOnly: true
          volumes:
            - name: tmp
              emptyDir: {}
            - name: database-credential
              secret:
                secretName: audit-core-database
                defaultMode: 0440
---
# Created empty by the operator so the CronJob's Role needs no `create`, and
# so the Deployment can mount it before the first run. An absent or undated
# attestation degrades the claim rather than breaking the receiver — that is
# T01's `no_attestation` path, and it is the correct behaviour on day one.
apiVersion: v1
kind: ConfigMap
metadata:
  name: audit-core-chain-head
  namespace: audit-core
  labels:
    app.kubernetes.io/name: audit-core
    app.kubernetes.io/component: attest
data:
  chain-head.json: "{}"