--- controls: version: 1.8 id: 2 text: "Worker Node Security Configuration" type: "node" groups: - id: 2.1 text: "Kubelet" checks: - id: 2.1.1 text: "Ensure that the --allow-privileged argument is set to false (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--allow-privileged" compare: op: eq value: false set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --allow-privileged=false Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.2 text: "Ensure that the --anonymous-auth argument is set to false (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--anonymous-auth" compare: op: eq value: false set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --anonymous-auth=false Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.3 text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--authorization-mode" compare: op: nothave value: "AlwaysAllow" set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_AUTHZ_ARGS variable. --authorization-mode=Webhook Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.4 text: "Ensure that the --client-ca-file argument is set as appropriate (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--client-ca-file" set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_AUTHZ_ARGS variable. --client-ca-file= Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.5 text: "Ensure that the --read-only-port argument is set to 0 (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--read-only-port" compare: op: eq value: 0 set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --read-only-port=0 Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.6 text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--streaming-connection-idle-timeout" compare: op: noteq value: 0 set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --streaming-connection-idle-timeout=5m Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.7 text: "Ensure that the --protect-kernel-defaults argument is set to true (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--protect-kernel-defaults" compare: op: eq value: true set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --protect-kernel-defaults=true Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.8 text: "Ensure that the --make-iptables-util-chains argument is set to true (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: bin_op: or test_items: - flag: "--make-iptables-util-chains" compare: op: eq value: true set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and remove the --make-iptables-util-chains argument from the KUBELET_SYSTEM_PODS_ARGS variable. Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.9 text: "Ensure that the --keep-terminated-pod-volumes argument is set to false (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--keep-terminated-pod-volumes" compare: op: eq value: false set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --keep-terminated-pod-volumes=false Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.10 text: "Ensure that the --hostname-override argument is not set (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--hostname-override" set: false remediation: | Edit the kubelet service file $kubeletconf on each worker node and remove the --hostname-override argument from the KUBELET_SYSTEM_PODS_ARGS variable. Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.11 text: "Ensure that the --event-qps argument is set to 0 (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--event-qps" compare: op: eq value: 0 set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable. --event-qps=0 Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.12 text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--tls-cert-file" set: true - flag: "--tls-private-key-file" set: true remediation: | Follow the Kubernetes documentation and set up the TLS connection on the Kubelet. Then edit the kubelet service file /etc/systemd/system/kubelet.service.d/10- kubeadm.conf on each worker node and set the below parameters in KUBELET_CERTIFICATE_ARGS variable. --tls-cert-file= file= --tls-private-key- Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.13 text: "Ensure that the --cadvisor-port argument is set to 0 (Scored)" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "--cadvisor-port" compare: op: eq value: 0 set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_CADVISOR_ARGS variable. --cadvisor-port=0 Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.14 text: "Ensure that the RotateKubeletClientCertificate argument is set to true" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "RotateKubeletClientCertificate" compare: op: eq value: true set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and remove the --feature- gates=RotateKubeletClientCertificate=false argument from the KUBELET_CERTIFICATE_ARGS variable. Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.1.15 text: "Ensure that the RotateKubeletServerCertificate argument is set to true" audit: "ps -ef | grep $kubeletbin | grep -v grep" tests: test_items: - flag: "RotateKubeletServerCertificate" compare: op: eq value: true set: true remediation: | Edit the kubelet service file $kubeletconf on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable. --feature-gates=RotateKubeletServerCertificate=true Based on your system, restart the kubelet service. For example: systemctl daemon-reload systemctl restart kubelet.service scored: true - id: 2.2 text: "Configuration Files" checks: - id: 2.2.1 text: "Ensure that the kubelet.conf file permissions are set to 644 or more restrictive (Scored)" audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'" tests: bin_op: or test_items: - flag: "644" compare: op: eq value: "644" set: true - flag: "640" compare: op: eq value: "640" set: true - flag: "600" compare: op: eq value: "600" set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chmod 644 $kubeletconf scored: true - id: 2.2.2 text: "Ensure that the kubelet.conf file ownership is set to root:root (Scored)" audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'" tests: test_items: - flag: "root:root" compare: op: eq value: root:root set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chown root:root /etc/kubernetes/kubelet.conf scored: true - id: 2.2.3 text: "Ensure that the kubelet service file permissions are set to 644 or more restrictive (Scored)" audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'" tests: bin_op: or test_items: - flag: "644" compare: op: eq value: 644 set: true - flag: "640" compare: op: eq value: "640" set: true - flag: "600" compare: op: eq value: "600" set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chmod 755 $kubeletconf scored: true - id: 2.2.4 text: "2.2.4 Ensure that the kubelet service file ownership is set to root:root (Scored)" audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'" tests: test_items: - flag: "root:root" set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chown root:root $kubeletconf scored: true - id: 2.2.5 text: "Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)" audit: "/bin/sh -c 'if test -e $proxyconf; then stat -c %a $proxyconf; fi'" tests: bin_op: or test_items: - flag: "644" compare: op: eq value: "644" set: true - flag: "640" compare: op: eq value: "640" set: true - flag: "600" compare: op: eq value: "600" set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chmod 644 $proxyconf scored: true - id: 2.2.6 text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)" audit: "/bin/sh -c 'if test -e $proxyconf; then stat -c %U:%G $proxyconf; fi'" tests: test_items: - flag: "root:root" set: true remediation: | Run the below command (based on the file location on your system) on the each worker node. For example, chown root:root $proxyconf scored: true - id: 2.2.7 text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Scored)" type: manual remediation: | Run the following command to modify the file permissions of the --client-ca-file chmod 644 scored: true - id: 2.2.8 text: "Ensure that the client certificate authorities file ownership is set to root:root" audit: "/bin/sh -c 'if test -e $ca-file; then stat -c %U:%G $ca-file; fi'" type: manual remediation: | Run the following command to modify the ownership of the --client-ca-file . chown root:root scored: true