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463 lines
20 KiB
463 lines
20 KiB
---
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controls:
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version: "cis-1.24"
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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 600 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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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: "600"
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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 600 $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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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 600 or more restrictive (Manual)"
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audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c permissions=%a $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: "permissions"
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set: true
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compare:
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op: bitmask
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value: "600"
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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 600 $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 $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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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 600 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: "600"
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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 600 $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: '/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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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 $kubeletkubeconfig
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scored: true
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- id: 4.1.7
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text: "Ensure that the certificate authorities file permissions are set to 600 or more restrictive (Manual)"
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audit: |
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CAFILE=$(ps -ef | grep kubelet | grep -v apiserver | grep -- --client-ca-file= | awk -F '--client-ca-file=' '{print $2}' | awk '{print $1}' | uniq)
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if test -z $CAFILE; then CAFILE=$kubeletcafile; fi
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if test -e $CAFILE; then stat -c permissions=%a $CAFILE; fi
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "600"
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remediation: |
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Run the following command to modify the file permissions of the
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--client-ca-file chmod 600 <filename>
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scored: false
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- id: 4.1.8
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text: "Ensure that the client certificate authorities file ownership is set to root:root (Manual)"
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audit: |
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CAFILE=$(ps -ef | grep kubelet | grep -v apiserver | grep -- --client-ca-file= | awk -F '--client-ca-file=' '{print $2}' | awk '{print $1}' | uniq)
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if test -z $CAFILE; then CAFILE=$kubeletcafile; fi
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if test -e $CAFILE; then stat -c %U:%G $CAFILE; fi
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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: "If the kubelet config.yaml configuration file is being used validate permissions set to 600 or more restrictive (Manual)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c permissions=%a $kubeletconf; 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: "600"
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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 600 $kubeletconf
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scored: false
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- id: 4.1.10
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text: "If the kubelet config.yaml configuration file is being used validate file ownership is set to root:root (Manual)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; 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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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: 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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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path: '{.authentication.anonymous.enabled}'
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compare:
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op: eq
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value: false
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remediation: |
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If using a Kubelet config file, edit the file to set `authentication: anonymous: enabled` to
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`false`.
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If using executable arguments, edit the kubelet service file
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$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/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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If using a Kubelet config file, edit the file to set `authorization.mode` to Webhook. If
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using executable arguments, edit the kubelet service file
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$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/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --client-ca-file
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path: '{.authentication.x509.clientCAFile}'
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remediation: |
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If using a Kubelet config file, edit the file to set `authentication.x509.clientCAFile` to
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the location of the client CA file.
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If using command line arguments, edit the kubelet service file
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$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: "Verify that the --read-only-port argument is set to 0 (Manual)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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bin_op: or
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test_items:
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- flag: "--read-only-port"
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path: '{.readOnlyPort}'
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compare:
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op: eq
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value: 0
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- flag: "--read-only-port"
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path: '{.readOnlyPort}'
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set: false
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remediation: |
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If using a Kubelet config file, edit the file to set `readOnlyPort` to 0.
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If using command line arguments, edit the kubelet service file
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$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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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compare:
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op: noteq
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value: 0
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set `streamingConnectionIdleTimeout` to a
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value other than 0.
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If using command line arguments, edit the kubelet service file
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$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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --protect-kernel-defaults
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path: '{.protectKernelDefaults}'
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compare:
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op: eq
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value: true
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remediation: |
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If using a Kubelet config file, edit the file to set `protectKernelDefaults` to `true`.
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If using command line arguments, edit the kubelet service file
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$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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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compare:
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op: eq
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value: true
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set `makeIPTablesUtilChains` to `true`.
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If using command line arguments, edit the kubelet service file
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$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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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 eventRecordQPS argument is set to a level which ensures appropriate event capture (Manual)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --event-qps
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path: '{.eventRecordQPS}'
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compare:
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op: gte
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value: 0
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- flag: --event-qps
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path: '{.eventRecordQPS}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set `eventRecordQPS` to an appropriate level.
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If using command line arguments, edit the kubelet service file
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$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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --tls-cert-file
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path: '{.tlsCertFile}'
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- flag: --tls-private-key-file
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path: '{.tlsPrivateKeyFile}'
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remediation: |
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If using a Kubelet config file, edit the file to set `tlsCertFile` to the location
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of the certificate file to use to identify this Kubelet, and `tlsPrivateKeyFile`
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to the location of the corresponding private key file.
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If using command line arguments, edit the kubelet service file
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$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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- 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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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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compare:
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op: eq
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value: true
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to add the line `rotateCertificates` to `true` or
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remove it altogether to use the default value.
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If using command line arguments, edit the kubelet service file
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$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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- 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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audit_config: "/bin/cat $kubeletconf"
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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
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remediation: |
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Edit the kubelet service file $kubeletsvc
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on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable.
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--feature-gates=RotateKubeletServerCertificate=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: false
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|
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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: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --tls-cipher-suites
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path: '{range .tlsCipherSuites[:]}{}{'',''}{end}'
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compare:
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op: valid_elements
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value: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
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remediation: |
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If using a Kubelet config file, edit the file to set `TLSCipherSuites` to
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TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
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or to a subset of these values.
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If using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the --tls-cipher-suites parameter as follows, or to a subset of these values.
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--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
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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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