From 7ae26163088f2c1e4d2cffbb2de8aa28201100fa Mon Sep 17 00:00:00 2001
From: Junwei Zhao <wahyd4@gmail.com>
Date: Wed, 1 Apr 2026 19:51:16 +1100
Subject: [PATCH] Add crowdsec auto ban

---
 adhoc-config/crowdsec-nginx-sync.yaml | 117 ++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 adhoc-config/crowdsec-nginx-sync.yaml

diff --git a/adhoc-config/crowdsec-nginx-sync.yaml b/adhoc-config/crowdsec-nginx-sync.yaml
new file mode 100644
index 0000000..18ef830
--- /dev/null
+++ b/adhoc-config/crowdsec-nginx-sync.yaml
@@ -0,0 +1,117 @@
+---
+# CrowdSec → NGINX Ingress IP Block Sync
+#
+# Runs every minute, reads all active CrowdSec ban decisions,
+# and updates the NGINX Ingress Controller ConfigMap's block-cidrs field.
+# This propagates CrowdSec's automated threat detection into NGINX's global IP blocklist.
+
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: crowdsec-nginx-sync
+  namespace: crowdsec
+
+---
+# Allow the sync job to read CrowdSec LAPI pod exec (to run cscli)
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: crowdsec-nginx-sync
+rules:
+  # Exec into CrowdSec LAPI pod to run cscli
+  - apiGroups: [""]
+    resources: ["pods/exec"]
+    verbs: ["create"]
+  - apiGroups: [""]
+    resources: ["pods"]
+    verbs: ["get", "list"]
+  # Read/patch the NGINX Ingress ConfigMap
+  - apiGroups: [""]
+    resources: ["configmaps"]
+    verbs: ["get", "patch"]
+
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: crowdsec-nginx-sync
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: crowdsec-nginx-sync
+subjects:
+  - kind: ServiceAccount
+    name: crowdsec-nginx-sync
+    namespace: crowdsec
+
+---
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: crowdsec-nginx-sync
+  namespace: crowdsec
+spec:
+  schedule: "* * * * *"        # every minute
+  concurrencyPolicy: Forbid    # skip if previous run is still going
+  successfulJobsHistoryLimit: 3
+  failedJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      activeDeadlineSeconds: 55  # must finish before next run
+      template:
+        spec:
+          serviceAccountName: crowdsec-nginx-sync
+          restartPolicy: Never
+          containers:
+            - name: sync
+              image: bitnami/kubectl:latest
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  set -e
+
+                  # Find the CrowdSec LAPI pod
+                  LAPI_POD=$(kubectl get pods -n crowdsec \
+                    -l "type=lapi" \
+                    -o jsonpath='{.items[0].metadata.name}')
+
+                  if [ -z "$LAPI_POD" ]; then
+                    echo "ERROR: CrowdSec LAPI pod not found"
+                    exit 1
+                  fi
+
+                  echo "Using LAPI pod: $LAPI_POD"
+
+                  # Fetch all active ban decisions in raw CSV format:
+                  # id,source,ip,reason,action,country,as,events_count,expiration,simulated,alert_id
+                  # The ip column has format "Ip:1.2.3.4" or "Range:1.2.3.0/24"
+                  RAW=$(kubectl exec -n crowdsec "$LAPI_POD" -- \
+                    cscli decisions list -t ban -o raw 2>/dev/null || true)
+
+                  # Skip CSV header, extract column 3, strip the "Ip:" / "Range:" prefix
+                  CIDRS=$(echo "$RAW" | \
+                    tail -n +2 | \
+                    cut -d',' -f3 | \
+                    sed 's/^[^:]*://g' | \
+                    grep -v '^$' | \
+                    tr '\n' ',' | \
+                    sed 's/,$//')
+
+                  echo "Active ban count: $(echo "$RAW" | tail -n +2 | grep -c '.' || echo 0)"
+                  echo "Blocked CIDRs: ${CIDRS:-<none>}"
+
+                  # Patch the NGINX Ingress ConfigMap (JSON merge patch — only updates block-cidrs)
+                  kubectl patch configmap ingress-nginx-controller \
+                    -n ingress-nginx \
+                    --type merge \
+                    -p "{\"data\":{\"block-cidrs\":\"${CIDRS}\"}}"
+
+                  echo "ConfigMap patched successfully"
+              resources:
+                requests:
+                  cpu: 10m
+                  memory: 32Mi
+                limits:
+                  cpu: 100m
+                  memory: 64Mi