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security(wave1): W1.1 audit-log shipping LIVE + W1.5 trusted-registries Enforce LIVE

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## W1.1 — K8s API audit log shipping (LIVE)
- alloy.yaml: added control-plane toleration so Alloy DaemonSet runs on
  k8s-master node. Verified alloy-7zg7t scheduled on master, tailing
  /var/log/kubernetes/audit.log
- loki.tf "Security Wave 1" rule group: added K2-K9 alert rules
  (skipped K1 per Q7 decision):
  - K2 K8sSATokenFromUnexpectedIP
  - K3 K8sSensitiveSecretReadByUnexpectedActor
  - K4 K8sExecIntoSensitiveNamespace
  - K5 K8sMassDelete (>5 Pod/Secret/CM in 60s by single user)
  - K6 K8sAuditPolicyModified (kubeadm-config CM change)
  - K7 K8sClusterRoleWildcardCreated (verbs=* + resources=*)
  - K8 K8sAnonymousBindingGranted
  - K9 K8sViktorFromUnexpectedIP
- All rules use source-IP regex matching the wave-1 allowlist
  (10.0.20.0/22, 192.168.1.0/24, 10.10.0.0/16 pod, 10.96.0.0/12 svc,
  100.64-127 tailnet) and `lane = "security"` → #security Slack route.
- Verified: kubectl-audit logs flowing in Loki query
  {job="kubernetes-audit"} returns events with node=k8s-master.
- Verified: /loki/api/v1/rules lists all K2-K9 + V1-V7 + S1.

## W1.5 — require-trusted-registries Enforce (LIVE)
- security-policies.tf: flipped Audit→Enforce with explicit allowlist
  built by `kubectl get pods -A -o jsonpath='{..image}'` enumeration.
- Removed `*/*` catch-all (which made Audit→Enforce a no-op).
- Pattern includes 15 explicit registries, 6 DockerHub library bare
  names, 56 DockerHub user repos.
- Verified by admission dry-run:
  - evilcorp.example/malware:v1 → BLOCKED with custom message
  - alpine:3.20 → ALLOWED (matches `alpine*`)
  - docker.io/library/alpine:3.20 → ALLOWED (matches `docker.io/*`)

## W1.6 — Calico flow logs (BLOCKED — Calico OSS limitation)
- Tried adding FelixConfiguration with flowLogsFileEnabled=true via
  kubectl_manifest in stacks/calico/main.tf
- Calico OSS rejected with "strict decoding error: unknown field
  spec.flowLogsFileEnabled" — these fields are Calico Enterprise/Tigera-only
- Removed the failed resource. Documented alternative paths in main.tf
  comment block: GNP with action=Log (iptables NFLOG → journal), Cilium
  migration, eBPF tooling, or Tigera Operator adoption.

## Docs updates
- security.md status table refreshed: W1.1/W1.2/W1.3/W1.4/W1.5 LIVE,
  W1.6/W1.7 blocked
- monitoring.md: Loki marked DEPLOYED (was incorrectly NOT-DEPLOYED in
  prior session before today's apply)

## Cleanup
- Removed stacks/kyverno/imports.tf (TF 1.5+ import blocks completed
  their job in the 2026-05-18 apply; should not stay in tree per TF docs)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Viktor Barzin 2026-05-19 06:37:54 +00:00
parent 8ef4f06ac0
commit 669ba97078
7 changed files with 166 additions and 88 deletions
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docs/architecture/monitoring.md
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@ -57,7 +57,7 @@ graph TB
|-----------|---------|----------|---------|
| Prometheus | Latest (Diun monitored) | `stacks/monitoring/modules/monitoring/` | Metrics collection and storage, scrape configs for all services |
| Grafana | Latest (Diun monitored) | `stacks/monitoring/modules/monitoring/` | Visualization, 14+ dashboards (API server, CoreDNS, GPU, UPS, etc.) |
| Loki | **NOT DEPLOYED as of 2026-05-18** — TF code exists in `stacks/monitoring/modules/monitoring/loki.tf` but `helm_release.loki` has a self-referencing `depends_on` that prevented apply. No `loki` Helm release in cluster, no Loki pods or Service. All "log aggregation" claims below are aspirational. Tracked under beads `code-146x`. | `stacks/monitoring/modules/monitoring/` | Log aggregation and querying (planned) |
| Loki | **DEPLOYED 2026-05-18** (SingleBinary mode, 30d retention, 50Gi PVC on `proxmox-lvm`, ruler enabled → Alertmanager). Re-enabled from previous "operational overhead" disable. Ships logs via Alloy DaemonSet (now on all nodes including master after 2026-05-19 toleration add). | `stacks/monitoring/modules/monitoring/` | Log aggregation and querying |
| Alertmanager | Latest (Diun monitored) | `stacks/monitoring/modules/monitoring/` | Alert routing with cascade inhibitions |
| Uptime Kuma | Latest (Diun monitored) | `stacks/uptime-kuma/` | Internal + external HTTP monitors, status page |
| External Monitor Sync | Python 3.12 | `stacks/uptime-kuma/` | CronJob (10min) syncs `[External]` monitors from `cloudflare_proxied_names` |