mirror of
https://github.com/aquasecurity/kube-bench.git
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430 lines
18 KiB
YAML
430 lines
18 KiB
YAML
---
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controls:
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version: rh-1.0
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id: 4
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text: "Worker Node Security Configuration"
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type: "node"
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groups:
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- id: 4.1
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text: "Worker Node Configuration Files"
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checks:
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- id: 4.1.1
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text: "Ensure that the kubelet service file permissions are set to 644 or more restrictive (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n permissions=%a" /etc/systemd/system/kubelet.service 2> /dev/null
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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By default, the kubelet service file has permissions of 644.
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scored: true
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- id: 4.1.2
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text: "Ensure that the kubelet service file ownership is set to root:root (Automated)"
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audit: |
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# Should return root:root for each node
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n %U:%G" /etc/systemd/system/kubelet.service 2> /dev/null
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tests:
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test_items:
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- flag: root:root
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remediation: |
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By default, the kubelet service file has ownership of root:root.
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scored: true
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- id: 4.1.3
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text: "If proxy kubeconfig file exists ensure permissions are set to 644 or more restrictive (Manual)"
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audit: |
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# Get the node name where the pod is running
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NODE_NAME=$(oc get pod "$HOSTNAME" -o=jsonpath='{.spec.nodeName}')
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# Get the pod name in the openshift-sdn namespace
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POD_NAME=$(oc get pods -n openshift-sdn -l app=sdn --field-selector spec.nodeName="$NODE_NAME" -o jsonpath='{.items[0].metadata.name}' 2>/dev/null)
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if [ -z "$POD_NAME" ]; then
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echo "No matching pods found on the current node."
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else
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# Execute the stat command
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oc exec -n openshift-sdn "$POD_NAME" -- stat -Lc "$i %n permissions=%a" /config/kube-proxy-config.yaml 2>/dev/null
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fi
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tests:
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bin_op: or
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test_items:
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- flag: "permissions"
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set: true
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compare:
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op: bitmask
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value: "644"
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remediation: |
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None needed.
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scored: false
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- id: 4.1.4
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text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Manual)"
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audit: |
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# Get the node name where the pod is running
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NODE_NAME=$(oc get pod "$HOSTNAME" -o=jsonpath='{.spec.nodeName}')
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# Get the pod name in the openshift-sdn namespace
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POD_NAME=$(oc get pods -n openshift-sdn -l app=sdn --field-selector spec.nodeName="$NODE_NAME" -o jsonpath='{.items[0].metadata.name}' 2>/dev/null)
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if [ -z "$POD_NAME" ]; then
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echo "No matching pods found on the current node."
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else
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# Execute the stat command
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oc exec -n openshift-sdn "$POD_NAME" -- stat -Lc "$i %n %U:%G" /config/kube-proxy-config.yaml 2>/dev/null
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fi
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use_multiple_values: true
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tests:
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bin_op: or
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test_items:
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- flag: root:root
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remediation: |
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None required. The configuration is managed by OpenShift operators.
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scored: false
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- id: 4.1.5
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text: "Ensure that the --kubeconfig kubelet.conf file permissions are set to 644 or more restrictive (Manual)"
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audit: |
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# Check permissions
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n permissions=%a" /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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None required.
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scored: false
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- id: 4.1.6
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text: "Ensure that the --kubeconfig kubelet.conf file ownership is set to root:root (Manual)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n %U:%G" /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: root:root
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remediation: |
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None required.
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scored: false
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- id: 4.1.7
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text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n permissions=%a" /etc/kubernetes/kubelet-ca.crt 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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None required.
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scored: true
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- id: 4.1.8
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text: "Ensure that the client certificate authorities file ownership is set to root:root (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n %U:%G" /etc/kubernetes/kubelet-ca.crt 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: root:root
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remediation: |
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None required.
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scored: true
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- id: 4.1.9
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text: "Ensure that the kubelet --config configuration file has permissions set to 644 or more restrictive (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n permissions=%a" /var/lib/kubelet/kubeconfig 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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None required.
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scored: true
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- id: 4.1.10
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text: "Ensure that the kubelet configuration file ownership is set to root:root (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host stat -c "$NODE_NAME %n %U:%G" /var/lib/kubelet/kubeconfig 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: root:root
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remediation: |
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None required.
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scored: true
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- id: 4.2
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text: "Kubelet"
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checks:
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- id: 4.2.1
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text: "Ensure that the --anonymous-auth argument is set to false (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host grep -B4 -A1 anonymous /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: "enabled: true"
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set: false
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remediation: |
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Follow the instructions in the documentation to create a Kubelet config CRD
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and set the anonymous-auth is set to false.
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scored: true
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- id: 4.2.2
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text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Manual)"
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type: manual
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# Takes a lot of time for connection to fail and
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audit: |
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POD=$(oc -n openshift-kube-apiserver get pod -l app=openshift-kube-apiserver -o jsonpath='{.items[0].metadata.name}')
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TOKEN=$(oc whoami -t)
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc exec -n openshift-kube-apiserver $POD -- curl -sS https://172.25.0.1/api/v1/nodes/$NODE_NAME/proxy/configz -k -H "Authorization:Bearer $TOKEN" | jq -r '.kubeletconfig.authorization.mode' 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: "Connection timed out"
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remediation: |
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None required. Unauthenticated/Unauthorized users have no access to OpenShift nodes.
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scored: false
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- id: 4.2.3
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text: "Ensure that the --client-ca-file argument is set as appropriate (Automated)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host grep clientCAFile /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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test_items:
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- flag: '"clientCAFile": "/etc/kubernetes/kubelet-ca.crt"'
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remediation: |
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None required. Changing the clientCAFile value is unsupported.
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scored: true
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- id: 4.2.4
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text: "Verify that the read only port is not used or is set to 0 (Automated)"
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audit: |
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echo `oc -n openshift-kube-apiserver get cm kube-apiserver-pod -o yaml | grep --color read-only-port` 2> /dev/null
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echo `oc -n openshift-kube-apiserver get cm config -o yaml | grep --color "read-only-port"` 2> /dev/null
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tests:
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bin_op: or
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test_items:
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- flag: "read-only-port"
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compare:
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op: has
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value: "[\"0\"]"
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- flag: "read-only-port"
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set: false
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remediation: |
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In earlier versions of OpenShift 4, the read-only-port argument is not used.
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Follow the instructions in the documentation to create a Kubelet config CRD
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and set the --read-only-port is set to 0.
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scored: true
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- id: 4.2.5
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text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Automated)"
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audit: |
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# Should return 1 for node
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/${NODE_NAME} -- chroot /host ps -ef | grep kubelet | grep streaming-connection-idle-timeout 2> /dev/null
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echo exit_code=$?
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# Should return 1 for node
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oc debug node/${NODE_NAME} -- chroot /host grep streamingConnectionIdleTimeout /etc/kubernetes/kubelet.conf 2> /dev/null
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echo exit_code=$?
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use_multiple_values: true
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tests:
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bin_op: or
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test_items:
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- flag: --streaming-connection-idle-timeout
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compare:
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op: noteq
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value: 0
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- flag: streamingConnectionIdleTimeout
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compare:
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op: noteq
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value: 0s
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- flag: "exit_code"
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compare:
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op: eq
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value: 1
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remediation: |
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Follow the instructions in the documentation to create a Kubelet config CRD and set
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the --streaming-connection-idle-timeout to the desired value. Do not set the value to 0.
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scored: true
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- id: 4.2.6
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text: "Ensure that the --protect-kernel-defaults argument is not set (Manual)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/$NODE_NAME -- chroot /host more /etc/kubernetes/kubelet.conf 2> /dev/null
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tests:
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test_items:
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- flag: protectKernelDefaults
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set: false
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remediation: |
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None required. The OpenShift 4 kubelet modifies the system tunable;
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using the protect-kernel-defaults flag will cause the kubelet to fail on start if the tunables
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don't match the kubelet configuration and the OpenShift node will fail to start.
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scored: false
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- id: 4.2.7
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text: "Ensure that the --make-iptables-util-chains argument is set to true (Manual)"
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audit: |
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/bin/bash
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flag=make-iptables-util-chains
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opt=makeIPTablesUtilChains
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# look at each machineconfigpool
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while read -r pool nodeconfig; do
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# true by default
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value='true'
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# first look for the flag
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oc get machineconfig $nodeconfig -o json | jq -r '.spec.config.systemd[][] | select(.name=="kubelet.service") | .contents' | sed -n "/^ExecStart=/,/^\$/ { /^\\s*--$flag=false/ q 100 }"
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# if the above command exited with 100, the flag was false
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[ $? == 100 ] && value='false'
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# now look in the yaml KubeletConfig
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yamlconfig=$(oc get machineconfig $nodeconfig -o json | jq -r '.spec.config.storage.files[] | select(.path=="/etc/kubernetes/kubelet.conf") | .contents.source ' | sed 's/^data:,//' | while read; do echo -e ${REPLY//%/\\x}; done)
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echo "$yamlconfig" | sed -n "/^$opt:\\s*false\\s*$/ q 100"
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[ $? == 100 ] && value='false'
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echo "Pool $pool has $flag ($opt) set to $value"
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done < <(oc get machineconfigpools -o json | jq -r '.items[] | select(.status.machineCount>0) | .metadata.name + " " + .spec.configuration.name')
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use_multiple_values: true
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tests:
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test_items:
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- flag: "set to true"
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remediation: |
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None required. The --make-iptables-util-chains argument is set to true by default.
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scored: false
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- id: 4.2.8
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text: "Ensure that the --hostname-override argument is not set (Manual)"
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audit: |
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echo `oc get machineconfig 01-worker-kubelet -o yaml | grep hostname-override`
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echo `oc get machineconfig 01-master-kubelet -o yaml | grep hostname-override`
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tests:
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test_items:
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- flag: hostname-override
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set: false
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remediation: |
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By default, --hostname-override argument is not set.
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scored: false
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- id: 4.2.9
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text: "Ensure that the kubeAPIQPS [--event-qps] argument is set to 0 or a level which ensures appropriate event capture (Manual)"
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audit: |
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/${NODE_NAME} -- chroot /host cat /etc/kubernetes/kubelet.conf;
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oc get machineconfig 01-worker-kubelet -o yaml | grep --color kubeAPIQPS%3A%2050
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oc get machineconfig 01-master-kubelet -o yaml | grep --color kubeAPIQPS%3A%2050
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type: "manual"
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remediation: |
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Follow the documentation to edit kubelet parameters
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https://docs.openshift.com/container-platform/4.5/scalability_and_performance/recommended-host-practices.html#create-a-kubeletconfig-crd-to-edit-kubelet-parameters
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KubeAPIQPS: <QPS>
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scored: false
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- id: 4.2.10
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text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)"
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audit: |
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oc get configmap config -n openshift-kube-apiserver -o json \
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| jq -r '.data["config.yaml"]' \
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| jq -r '.apiServerArguments |
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.["kubelet-client-certificate"][0],
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.["kubelet-client-key"][0]
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'
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tests:
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bin_op: and
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test_items:
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- flag: "/etc/kubernetes/static-pod-certs/secrets/kubelet-client/tls.crt"
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- flag: "/etc/kubernetes/static-pod-certs/secrets/kubelet-client/tls.key"
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remediation: |
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OpenShift automatically manages TLS authentication for the API server communication with the node/kublet.
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This is not configurable.
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scored: true
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- id: 4.2.11
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text: "Ensure that the --rotate-certificates argument is not set to false (Manual)"
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audit: |
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#Verify the rotateKubeletClientCertificate feature gate is not set to false
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/${NODE_NAME} -- chroot /host cat /etc/kubernetes/kubelet.conf | grep RotateKubeletClientCertificate 2> /dev/null
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# Verify the rotateCertificates argument is set to true
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oc debug node/${NODE_NAME} -- chroot host grep rotate /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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bin_op: or
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test_items:
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- flag: rotateCertificates
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compare:
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op: eq
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value: true
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- flag: rotateKubeletClientCertificates
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compare:
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op: noteq
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value: false
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- flag: rotateKubeletClientCertificates
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set: false
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remediation: |
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None required.
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scored: false
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- id: 4.2.12
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text: "Verify that the RotateKubeletServerCertificate argument is set to true (Manual)"
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audit: |
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#Verify the rotateKubeletServerCertificate feature gate is on
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NODE_NAME=$(oc get pod $HOSTNAME -o=jsonpath='{.spec.nodeName}')
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oc debug node/${NODE_NAME} -- chroot /host grep RotateKubeletServerCertificate /etc/kubernetes/kubelet.conf 2> /dev/null
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# Verify the rotateCertificates argument is set to true
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oc debug node/${NODE_NAME} -- chroot host grep rotate /etc/kubernetes/kubelet.conf 2> /dev/null
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use_multiple_values: true
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tests:
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bin_op: or
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test_items:
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- flag: rotateCertificates
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compare:
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op: eq
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value: true
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- flag: RotateKubeletServerCertificate
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compare:
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op: eq
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value: true
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remediation: |
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By default, kubelet server certificate rotation is disabled.
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scored: false
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- id: 4.2.13
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text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Manual)"
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audit: |
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# needs verification
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# verify cipher suites
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oc describe --namespace=openshift-ingress-operator ingresscontroller/default
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oc get kubeapiservers.operator.openshift.io cluster -o json |jq .spec.observedConfig.servingInfo
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oc get openshiftapiservers.operator.openshift.io cluster -o json |jq .spec.observedConfig.servingInfo
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oc get cm -n openshift-authentication v4-0-config-system-cliconfig -o jsonpath='{.data.v4\-0\-config\-system\-cliconfig}' | jq .servingInfo
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#check value for tlsSecurityProfile; null is returned if default is used
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oc get kubeapiservers.operator.openshift.io cluster -o json |jq .spec.tlsSecurityProfile
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type: manual
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remediation: |
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Follow the directions above and in the OpenShift documentation to configure the tlsSecurityProfile.
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Configuring Ingress
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scored: false
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