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494 lines
21 KiB
494 lines
21 KiB
---
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controls:
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version: "k3s-cis-1.23"
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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: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c permissions=%a $kubeletsvc; fi'' '
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type: "skip"
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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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Run the below command (based on the file location on your system) on the each worker node.
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For example, chmod 644 $kubeletsvc
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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: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c %U:%G $kubeletsvc; fi'' '
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type: "skip"
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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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Run the below command (based on the file location on your system) on the each worker node.
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For example,
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chown root:root $kubeletsvc
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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: 'stat -c %a /var/lib/rancher/k3s/agent/kubeproxy.kubeconfig'
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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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Run the below command (based on the file location on your system) on the each worker node.
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For example,
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chmod 644 $proxykubeconfig
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scored: false
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- id: 4.1.4
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text: "If proxy kubeconfig file exists ensure ownership is set to root:root (Manual)"
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audit: '/bin/sh -c ''if test -e /var/lib/rancher/k3s/agent/kubeproxy.kubeconfig; then stat -c %U:%G /var/lib/rancher/k3s/agent/kubeproxy.kubeconfig; fi'' '
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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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Run the below command (based on the file location on your system) on the each worker node.
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For example, chown root:root $proxykubeconfig
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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 (Automated)"
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audit: 'stat -c %a /var/lib/rancher/k3s/agent/kubelet.kubeconfig '
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tests:
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test_items:
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- flag: "644"
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compare:
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op: eq
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value: "644"
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set: true
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remediation: |
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Run the below command (based on the file location on your system) on the each worker node.
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For example,
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chmod 644 $kubeletkubeconfig
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scored: true
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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 (Automated)"
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audit: 'stat -c %U:%G /var/lib/rancher/k3s/agent/kubelet.kubeconfig'
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tests:
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test_items:
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- flag: "root:root"
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compare:
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op: eq
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value: "root:root"
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set: true
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remediation: |
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Run the below command (based on the file location on your system) on the each worker node.
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For example,
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chown root:root $kubeletkubeconfig
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scored: true
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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 (Manual)"
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audit: "stat -c %a /var/lib/rancher/k3s/server/tls/server-ca.crt"
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tests:
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test_items:
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- flag: "644"
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compare:
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op: eq
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value: "644"
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set: true
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- flag: "640"
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compare:
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op: eq
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value: "640"
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set: true
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- flag: "600"
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compare:
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op: eq
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value: "600"
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set: true
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- flag: "444"
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compare:
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op: eq
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value: "444"
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set: true
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- flag: "440"
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compare:
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op: eq
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value: "440"
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set: true
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- flag: "400"
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compare:
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op: eq
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value: "400"
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set: true
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- flag: "000"
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compare:
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op: eq
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value: "000"
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set: true
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bin_op: or
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remediation: |
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Run the following command to modify the file permissions of the
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--client-ca-file chmod 644 <filename>
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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 (Manual)"
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audit: "stat -c %U:%G /var/lib/rancher/k3s/server/tls/client-ca.crt"
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tests:
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test_items:
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- flag: root:root
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compare:
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op: eq
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value: root:root
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remediation: |
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Run the following command to modify the ownership of the --client-ca-file.
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chown root:root <filename>
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scored: false
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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: '/bin/sh -c ''if test -e $kubeletconf; then stat -c permissions=%a $kubeletconf; fi'' '
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type: "skip"
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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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Run the following command (using the config file location identified in the Audit step)
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chmod 644 $kubeletconf
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scored: true
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- id: 4.1.10
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text: "Ensure that the kubelet --config configuration file ownership is set to root:root (Automated)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'' '
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type: "skip"
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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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Run the following command (using the config file location identified in the Audit step)
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chown root:root $kubeletconf
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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: '/bin/sh -c ''if test $(journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | wc -l) -gt 0; then journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "anonymous-auth" | grep -v grep; else echo "--anonymous-auth=false"; fi'' '
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tests:
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test_items:
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- flag: "--anonymous-auth"
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path: '{.authentication.anonymous.enabled}'
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compare:
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op: eq
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value: false
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set `authentication: anonymous: enabled` to
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`false`.
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If using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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`--anonymous-auth=false`
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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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 (Automated)"
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audit: '/bin/sh -c ''if test $(journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | wc -l) -gt 0; then journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "authorization-mode" | grep -v grep; else echo "--authorization-mode=Webhook"; fi'' '
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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compare:
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op: nothave
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value: AlwaysAllow
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set `authorization.mode` to Webhook. If
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using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--authorization-mode=Webhook
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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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: '/bin/sh -c ''if test $(journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | wc -l) -gt 0; then journalctl -D /var/log/journal -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "client-ca-file" | grep -v grep; else echo "--client-ca-file=/var/lib/rancher/k3s/server/tls/request-header-ca.crt"; fi'' '
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tests:
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test_items:
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- flag: --client-ca-file
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path: '{.authentication.x509.clientCAFile}'
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set `authentication.x509.clientCAFile` to
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the location of the client CA file.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--client-ca-file=<path/to/client-ca-file>
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.4
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text: "Ensure that the --read-only-port argument is set to 0 (Manual)"
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audit: "journalctl -D /var/log/journal -u k3s | grep 'Running kubelet' | tail -n1 | grep 'read-only-port' "
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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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path: '{.readOnlyPort}'
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compare:
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op: eq
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value: 0
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- flag: "--read-only-port"
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path: '{.readOnlyPort}'
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set: false
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remediation: |
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If using a Kubelet config file, edit the file to set `readOnlyPort` to 0.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--read-only-port=0
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
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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 (Manual)"
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audit: "journalctl -D /var/log/journal -u k3s | grep 'Running kubelet' | tail -n1 | grep 'streaming-connection-idle-timeout'"
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tests:
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test_items:
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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compare:
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op: noteq
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value: 0
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set `streamingConnectionIdleTimeout` to a
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value other than 0.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--streaming-connection-idle-timeout=5m
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
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- id: 4.2.6
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text: "Ensure that the --protect-kernel-defaults argument is set to true (Automated)"
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audit: "journalctl -D /var/log/journal -u k3s | grep 'Running kubelet' | tail -n1 | grep 'protect-kernel-defaults'"
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type: "skip"
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tests:
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test_items:
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- flag: --protect-kernel-defaults
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path: '{.protectKernelDefaults}'
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compare:
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op: eq
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value: true
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set `protectKernelDefaults` to `true`.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--protect-kernel-defaults=true
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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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 (Automated)"
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audit: "journalctl -D /var/log/journal -u k3s | grep 'Running kubelet' | tail -n1 | grep 'make-iptables-util-chains'"
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type: "skip"
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tests:
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test_items:
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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compare:
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op: eq
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value: true
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set: true
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set `makeIPTablesUtilChains` to `true`.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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remove the --make-iptables-util-chains argument from the
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KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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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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# This is one of those properties that can only be set as a command line argument.
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# To check if the property is set as expected, we need to parse the kubelet command
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# instead reading the Kubelet Configuration file.
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audit: "/bin/ps -fC $kubeletbin "
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type: "skip"
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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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Edit the kubelet service file $kubeletsvc
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on each worker node and remove the --hostname-override argument from the
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KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example,
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
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- id: 4.2.9
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text: "Ensure that the --event-qps argument is set to 0 or a level which ensures appropriate event capture (Manual)"
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audit: "/bin/ps -fC $kubeletbin"
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type: "manual"
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tests:
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test_items:
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- flag: --event-qps
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path: '{.eventRecordQPS}'
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compare:
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op: eq
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value: 0
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remediation: |
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If using a Kubelet config file, edit the file to set `eventRecordQPS` to an appropriate level.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example,
|
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
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|
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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 (Manual)"
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audit: "journalctl -D /var/log/journal -u k3s | grep 'Running kubelet' | tail -n1"
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tests:
|
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test_items:
|
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- flag: --tls-cert-file
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path: '/var/lib/rancher/k3s/agent/serving-kubelet.crt'
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- flag: --tls-private-key-file
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path: '/var/lib/rancher/k3s/agent/serving-kubelet.key'
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remediation: |
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If using a Kubelet config file, edit the file to set `tlsCertFile` to the location
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of the certificate file to use to identify this Kubelet, and `tlsPrivateKeyFile`
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to the location of the corresponding private key file.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameters in KUBELET_CERTIFICATE_ARGS variable.
|
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--tls-cert-file=<path/to/tls-certificate-file>
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--tls-private-key-file=<path/to/tls-key-file>
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Based on your system, restart the kubelet service. For example,
|
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: false
|
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|
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- id: 4.2.11
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text: "Ensure that the --rotate-certificates argument is not set to false (Automated)"
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audit: "/bin/ps -fC $kubeletbin"
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type: "skip"
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tests:
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test_items:
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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compare:
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op: eq
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value: true
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to add the line `rotateCertificates` to `true` or
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remove it altogether to use the default value.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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remove --rotate-certificates=false argument from the KUBELET_CERTIFICATE_ARGS
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variable.
|
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Based on your system, restart the kubelet service. For example,
|
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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|
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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: "/bin/ps -fC $kubeletbin"
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type: "skip"
|
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tests:
|
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bin_op: or
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test_items:
|
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- flag: RotateKubeletServerCertificate
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path: '{.featureGates.RotateKubeletServerCertificate}'
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compare:
|
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op: nothave
|
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value: false
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- flag: RotateKubeletServerCertificate
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path: '{.featureGates.RotateKubeletServerCertificate}'
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|
set: false
|
|
remediation: |
|
|
Edit the kubelet service file $kubeletsvc
|
|
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: false
|
|
|
|
- id: 4.2.13
|
|
text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Manual)"
|
|
audit: "/bin/ps -fC $kubeletbin"
|
|
type: "manual"
|
|
tests:
|
|
test_items:
|
|
- flag: --tls-cipher-suites
|
|
path: '{range .tlsCipherSuites[:]}{}{'',''}{end}'
|
|
compare:
|
|
op: valid_elements
|
|
value: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set `TLSCipherSuites` to
|
|
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
|
|
or to a subset of these values.
|
|
If using executable arguments, edit the kubelet service file
|
|
$kubeletsvc on each worker node and
|
|
set the --tls-cipher-suites parameter as follows, or to a subset of these values.
|
|
--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: false
|