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challenge.yaml
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# create namespace flag-receiver
apiVersion: v1
kind: Namespace
metadata:
name: flag-receiver
labels:
pod-security.kubernetes.io/enforce: "restricted"
---
# create namespace flag-sender
apiVersion: v1
kind: Namespace
metadata:
name: flag-sender
---
# create sa ctf-player
apiVersion: v1
kind: ServiceAccount
metadata:
name: ctf-player
---
# create flag secret
apiVersion: v1
kind: Secret
metadata:
name: flag
namespace: flag-sender
type: Opaque
data:
flag: cG90bHVja3trdWJlcm5ldGVzX2Nhbl9iZV9hX2JpdF93ZWlyZH0=
---
# create flag-sender pod
apiVersion: apps/v1
kind: Deployment
metadata:
name: flag-sender
namespace: flag-sender
labels:
app: flag-sender
spec:
replicas: 1
selector:
matchLabels:
app: flag-sender
template:
metadata:
labels:
app: flag-sender
spec:
containers:
- name: container
image: busybox
imagePullPolicy: IfNotPresent
command:
- sh
args:
- -c
- while true; do echo $FLAG | nc 1.1.1.1 80 || continue; echo 'Flag Send'; sleep 10; done
env:
- name: FLAG
valueFrom:
secretKeyRef:
name: flag
key: flag
restartPolicy: Always
serviceAccountName: default
dnsPolicy: ClusterFirst
securityContext: {}
---
# create network policy
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: flag-receiver
namespace: flag-receiver
spec:
ingress:
- from:
- namespaceSelector:
matchLabels:
ns: flag-sender
podSelector:
matchLabels:
app: flag-sender
podSelector: {}
policyTypes:
- Ingress
- Egress
---
# setup rbac
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: ctf-player
rules:
- apiGroups: [""]
resources: ["namespaces"]
verbs: ["list"]
- apiGroups: [""]
resources: ["pods"]
verbs: ["list"]
- apiGroups: [""]
resources: ["services"]
verbs: ["list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: ctf-player
subjects:
- kind: ServiceAccount
name: ctf-player
namespace: default
roleRef:
kind: ClusterRole
name: ctf-player
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: flag-receiver
name: ctf-player
rules:
- apiGroups: [""]
resources: ["pods.*"]
verbs: ["create", "delete"]
- apiGroups: [""]
resources: ["pods"]
verbs: ["get", "create", "delete"]
- apiGroups: [""]
resources: ["pods/log"]
verbs: ["get"]
- apiGroups: [""]
resources: ["services.*"]
verbs: ["create", "delete"]
- apiGroups: [""]
resources: ["services"]
verbs: ["get", "create", "delete"]
- apiGroups: ["networking.k8s.io"]
resources: ["networkpolicies"]
verbs: ["list", "get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: ctf-player
namespace: flag-receiver
subjects:
- kind: ServiceAccount
name: ctf-player
namespace: default
roleRef:
kind: Role
name: ctf-player
apiGroup: rbac.authorization.k8s.io
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
namespace: flag-sender
name: ctf-player
rules:
- apiGroups: [""]
resources: ["pods/log"]
verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: ctf-player
namespace: flag-sender
subjects:
- kind: ServiceAccount
name: ctf-player
namespace: default
roleRef:
kind: Role
name: ctf-player
apiGroup: rbac.authorization.k8s.io