Awesome

# remove old versions
apt-get remove docker docker-engine docker.io containerd runc
# install
apt-get update
apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg \
    lsb-release
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
echo \
  "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

apt-get update
apt-get install docker-ce docker-ce-cli containerd.io

Install minikube

The documentation can be found here. In AWS you need to run:

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
install minikube-linux-amd64 /usr/local/bin/minikube
swapoff -a
apt install conntrack
minikube start --driver=none

Install kubectl

# https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

Create containers

Privileged container

kubectl apply -f - <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: priv-pod
spec:
  containers:
  - name: sec-ctx-8
    image: gcr.io/google-samples/node-hello:1.0
    securityContext:
      allowPrivilegeEscalation: true
      privileged: true
      readOnlyRootFilesystem: true
      runAsNonRoot: true
      runAsUser: 1000
      capabilities:
        add: ["NET_ADMIN", "SYS_TIME"]
EOF

Container with environment variables passwords

kubectl apply -f - <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: envvars-db
  namespace: default
spec:
  containers:
  - name: envvars-multiple-secrets
    image: nginx
    env:
    - name: DB_PASSWORD
      valueFrom:
        secretKeyRef:
          key: db-username-key
          name: db-username
    - name: DB_USERNAME
      valueFrom:
        secretKeyRef:
          key: db-password-key
          name: db-password
EOF

kubectl apply -f - <<EOF

apiVersion: v1
kind: Namespace
metadata:
  creationTimestamp: null
  name: mars
---

apiVersion: v1
kind: ServiceAccount
metadata:
  namespace: mars
  name: user1
  
---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: kube-system
  name: list-secrets
rules:
- apiGroups: ["*"]
  resources: ["secrets"]
  verbs: ["get", "list"]
  
---

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  namespace: kube-system
  name: list-secrets-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: list-secrets
subjects:
  - kind: ServiceAccount
    name: user1
    namespace: mars
    
---

apiVersion: v1
kind: Pod
metadata:
  name: alpine-secret
  namespace: mars
spec:
  containers:
  - name: alpine-secret
    image: alpine
    command: ["/bin/sh"]
    args: ["-c", "sleep 100000"]
  serviceAccountName: user1
  automountServiceAccountToken: true
  hostNetwork: true
---

apiVersion: v1
kind: Secret
metadata:
  name: db-username
data:
  db-username-key: YWRtaW4=

---

apiVersion: v1
kind: Secret
metadata:
  name: db-password
data:
  db-password-key: MTIzNDU=

EOF

Get ServiceAccount token by name

kubectl get secrets $(kubectl get sa <SERVICE_ACCOUNT_NAME> -o json | jq -r '.secrets[].name') -o json | jq -r '.data.token' | base64 -d

Function:

alias k=kubectl
function getSecretByName {
k get secrets $(k get sa $1 -o json | jq -r '.secrets[].name') -o json | jq -r '.data.token' | base64 -d
}

getSecretByName <serviceAccountName>

*Replace <SERVICE_ACCOUNT_NAME> with the name

Delete multiple containers

// delete by match with grep
kubectl delete po $(kubectl get pods -o go-template -n <NAMESPACE> --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep <SEARCH_STRING) -n <NAMESPACE>

// delete specific pods
kubectl delete pods -n <NAMESPACE> $(echo -e 'alpine1\nalpine2\nalpine3')

Get docker container IPs

docker inspect --format='{{.Name}}' $(docker ps -aq -f label=kubelabel)
docker inspect --format='{{ .NetworkSettings.IPAddress }}' $(docker ps -aq -f label=kubelabel)

Awesome

HackingKubernetes

Offensive

Atricles

kubelet

Containers and Pods

PDF

Videos

Vulnerabilities

2020

2019

Kubectl vulnerability (CVE-2019-1002101)

Kubernetes API server vulnerability (CVE-2019-11247)

Kubernetes billion laughs attack vulnerability (CVE-2019-11253)

2018

Tools

Defensive

Others

Install Docker on Ubuntu

Install minikube

Install kubectl

Create containers

Privileged container

Container with environment variables passwords

Get ServiceAccount token by name

Delete multiple containers

Get docker container IPs