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254 lines
9.5 KiB
254 lines
9.5 KiB
---
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controls:
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version: "cis-1.6-k3s"
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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 (Not Applicable)"
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scored: false
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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 (Not Applicable)"
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scored: false
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- id: 4.1.3
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text: "If proxy kubeproxy.kubeconfig file exists ensure permissions are set to 644 or more restrictive (Automated)"
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audit: stat -c %a $proxykubeconfig
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tests:
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bin_op: or
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test_items:
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- flag: "permissions"
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set: true
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compare:
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op: bitmask
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value: "644"
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- flag: "$proxykubeconfig"
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set: false
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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: true
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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 (Automated)"
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audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %U:%G $proxykubeconfig; fi'' '
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tests:
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bin_op: or
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test_items:
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- flag: root:root
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- flag: "$proxykubeconfig"
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set: false
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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: true
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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: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c permissions=%a $kubeletkubeconfig; fi'' '
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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, K3s creates $kubeletkubeconfig with 644 permissions. No manual remediation needed.
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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: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c %U:%G $kubeletkubeconfig; fi'' '
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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, K3s creates $kubeletkubeconfig with root:root ownership. No manual remediation needed.
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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 (Automated)"
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audit: stat -c permissions=%a $kubeletcafile
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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, K3s creates $kubeletcafile with 644 permissions.
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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: stat -c %U:%G $kubeletcafile
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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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By default, K3s creates $kubeletcafile with root:root ownership.
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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 (Not Applicable)"
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scored: false
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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 (Not Applicable)"
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scored: false
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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: journalctl -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "anonymous-auth"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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compare:
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op: eq
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value: false
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remediation: |
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By default, K3s starts kubelet with --anonymous-auth set to false. No manual remediation needed.
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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: journalctl -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "authorization-mode"
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tests:
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test_items:
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- flag: --authorization-mode
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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K3s starts kubelet with Webhook as the value for the --authorization-mode argument. No manual remediation needed.
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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: journalctl -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "client-ca-file"
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tests:
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test_items:
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- flag: --client-ca-file
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remediation: |
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By default, K3s starts the kubelet process with the --client-ca-file. No manual remediation needed.
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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 (Automated)"
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audit: journalctl -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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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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set: false
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remediation: |
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By default, K3s starts the kubelet process with the --read-only-port argument set to 0.
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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 (Automated)"
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audit: journalctl -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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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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set: false
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bin_op: or
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remediation: |
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By default, K3s does not set --streaming-connection-idle-timeout when starting kubelet.
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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 set to true (Automated)"
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audit: journalctl -u k3s | grep "Running kubelet" | tail -n1 | grep "protect-kernel-defaults"
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tests:
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test_items:
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- flag: --protect-kernel-defaults
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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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K3s server needs to be started with the following, --protect-kernel-defaults=true.
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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 -u k3s | grep "Running kubelet" | tail -n1 | grep "make-iptables-util-chains"
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tests:
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test_items:
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- flag: --make-iptables-util-chains
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compare:
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op: eq
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value: true
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- flag: --make-iptables-util-chains
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set: false
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bin_op: or
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remediation: |
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K3s server needs to be run with the following, --kube-apiserver-arg='make-iptables-util-chains=true'.
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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 (Not Applicable)"
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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 containerd
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tests:
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test_items:
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- flag: --event-qps
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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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- 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 -u k3s | grep "Running kubelet" | tail -n1 | grep -E 'tls-cert-file|tls-private-key-file'
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tests:
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test_items:
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- flag: --tls-cert-file
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- flag: --tls-private-key-file
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remediation: |
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By default, K3s sets the --tls-cert-file and --tls-private-key-file arguments when executing the kubelet process.
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scored: false
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- id: 4.2.11
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text: "Ensure that the --rotate-certificates argument is not set to false (Not Applicable)"
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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 (Not Applicable)"
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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 (Not Applicable)"
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scored: false
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