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543 lines
19 KiB
543 lines
19 KiB
---
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controls:
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version: "1.13"
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id: "2"
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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: "2.1"
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text: Kubelet
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checks:
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- id: 2.1.1
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text: Ensure that the --anonymous-auth argument is set to false (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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path: '{.authentication.anonymous.enabled}'
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set: true
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compare:
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op: eq
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value: false
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remediation: |
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If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to
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false .
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If using executable arguments, edit the kubelet service file
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$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: 2.1.2
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text: Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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set: true
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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If using a Kubelet config file, edit the file to set authorization: mode to Webhook.
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If using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_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: 2.1.3
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text: Ensure that the --client-ca-file argument is set as appropriate (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --client-ca-file
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path: '{.authentication.x509.clientCAFile}'
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set authentication: x509: clientCAFile to
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the location of the client CA file.
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If using command line arguments, edit the kubelet service file
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$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: 2.1.4
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text: Ensure that the --read-only-port argument is set to 0 (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--read-only-port"
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path: '{.readOnlyPort}'
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set: true
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compare:
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op: eq
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value: 0
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remediation: |
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If using a Kubelet config file, edit the file to set readOnlyPort to 0 .
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If using command line arguments, edit the kubelet service file
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$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: true
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- id: 2.1.5
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text: Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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set: true
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compare:
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op: noteq
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value: 0
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set streamingConnectionIdleTimeout to a
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value other than 0.
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If using command line arguments, edit the kubelet service file
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$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: true
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- id: 2.1.6
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text: Ensure that the --protect-kernel-defaults argument is set to true (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --protect-kernel-defaults
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path: '{.protectKernelDefaults}'
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set: true
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compare:
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op: eq
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value: true
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remediation: |
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If using a Kubelet config file, edit the file to set protectKernelDefaults: true .
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If using command line arguments, edit the kubelet service file
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$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: 2.1.7
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text: Ensure that the --make-iptables-util-chains argument is set to true (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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set: true
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compare:
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op: eq
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value: true
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set makeIPTablesUtilChains: true .
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If using command line arguments, edit the kubelet service file
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$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: 2.1.8
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text: Ensure that the --hostname-override argument is not set (Scored)
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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: true
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- id: 2.1.9
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text: Ensure that the --event-qps argument is set to 0 (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --event-qps
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path: '{.eventRecordQPS}'
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set: true
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compare:
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op: eq
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value: 0
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remediation: |
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If using a Kubelet config file, edit the file to set eventRecordQPS: 0 .
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--event-qps=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: true
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- id: 2.1.10
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text: Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --tls-cert-file
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path: '{.tlsCertFile}'
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set: true
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- flag: --tls-private-key-file
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path: '{.tlsPrivateKeyFile}'
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set: true
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bin_op: and
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remediation: |
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If using a Kubelet config file, edit the file to set tlsCertFile to the location of the certificate
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file to use to identify this Kubelet, and tlsPrivateKeyFile to the location of the
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corresponding private key file.
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If using command line arguments, edit the kubelet service file
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$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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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: true
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- id: 2.1.11
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text: '[DEPRECATED] Ensure that the --cadvisor-port argument is set to 0'
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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: --cadvisor-port
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set: true
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compare:
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op: eq
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value: 0
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- flag: --cadvisor-port
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set: false
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bin_op: or
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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_CADVISOR_ARGS variable.
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--cadvisor-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: 2.1.12
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text: Ensure that the --rotate-certificates argument is not set to false (Scored)
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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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set: true
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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: true.
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If using command line arguments, edit the kubelet service file $kubeletsvc
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on each worker node and add --rotate-certificates=true argument to the KUBELET_CERTIFICATE_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: 2.1.13
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text: Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)
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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: RotateKubeletServerCertificate
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path: '{.featureGates.RotateKubeletServerCertificate}'
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set: true
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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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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: true
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- id: 2.1.14
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text: Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Not Scored)
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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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set: true
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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 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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If using executable arguments, edit the kubelet service file $kubeletsvc on each worker node and set the below parameter.
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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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scored: false
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- id: "2.2"
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text: Configuration Files
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checks:
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- id: 2.2.1
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text: Ensure that the kubelet.conf file permissions are set to 644 or more restrictive (Scored)
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audit: '/bin/sh -c ''if test -e $kubeletkubeconfig; then stat -c %a $kubeletkubeconfig; fi'' '
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tests:
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test_items:
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- flag: "644"
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set: true
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compare:
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op: eq
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value: "644"
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- flag: "640"
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set: true
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compare:
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op: eq
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value: "640"
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- flag: "600"
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set: true
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compare:
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op: eq
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value: "600"
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bin_op: or
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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
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node. For example,
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chmod 644 $kubeletkubeconfig
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scored: true
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- id: 2.2.2
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text: Ensure that the kubelet.conf file ownership is set to root:root (Scored)
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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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set: true
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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 below command (based on the file location on your system) on the each worker
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node. For example,
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chown root:root $kubeletkubeconfig
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scored: true
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- id: 2.2.3
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text: Ensure that the kubelet service file permissions are set to 644 or more restrictive (Scored)
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audit: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c %a $kubeletsvc; fi'' '
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tests:
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test_items:
|
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- flag: "644"
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set: true
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compare:
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op: eq
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value: "644"
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- flag: "640"
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set: true
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compare:
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op: eq
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value: "640"
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- flag: "600"
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set: true
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compare:
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op: eq
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value: "600"
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bin_op: or
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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
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node. For example,
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chmod 644 $kubeletsvc
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scored: true
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- id: 2.2.4
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text: Ensure that the kubelet service file ownership is set to root:root (Scored)
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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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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
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node. For example,
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chown root:root $kubeletsvc
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scored: true
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|
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- id: 2.2.5
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text: Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)
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audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %a $proxykubeconfig; fi'' '
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tests:
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test_items:
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- flag: "644"
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set: true
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compare:
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op: eq
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value: "644"
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- flag: "640"
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set: true
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compare:
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op: eq
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value: "640"
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- flag: "600"
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set: true
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compare:
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op: eq
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value: "600"
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bin_op: or
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remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker
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node. For example,
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chmod 644 $proxykubeconfig
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scored: true
|
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|
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- id: 2.2.6
|
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text: Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)
|
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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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test_items:
|
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- flag: root:root
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set: true
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remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker
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node. For example,
|
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chown root:root $proxykubeconfig
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scored: true
|
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|
|
- id: 2.2.7
|
|
text: Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Scored)
|
|
audit: "/bin/sh -c 'if test -e $kubeletcafile; then stat -c %a $kubeletcafile; fi'"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "644"
|
|
compare:
|
|
op: eq
|
|
value: "644"
|
|
set: true
|
|
- flag: "640"
|
|
compare:
|
|
op: eq
|
|
value: "640"
|
|
set: true
|
|
- flag: "600"
|
|
compare:
|
|
op: eq
|
|
value: "600"
|
|
set: true
|
|
remediation: |
|
|
Run the following command to modify the file permissions of the --client-ca-file
|
|
chmod 644 <filename>
|
|
scored: true
|
|
|
|
- id: 2.2.8
|
|
text: Ensure that the client certificate authorities file ownership is set to root:root (Scored)
|
|
audit: '/bin/sh -c ''if test -e $kubeletcafile; then stat -c %U:%G $kubeletcafile; fi'' '
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
set: true
|
|
compare:
|
|
op: eq
|
|
value: root:root
|
|
remediation: |
|
|
Run the following command to modify the ownership of the --client-ca-file .
|
|
chown root:root <filename>
|
|
scored: true
|
|
|
|
- id: 2.2.9
|
|
text: Ensure that the kubelet configuration file ownership is set to root:root (Scored)
|
|
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'' '
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
set: true
|
|
remediation: |
|
|
Run the following command (using the config file location identied in the Audit step)
|
|
chown root:root $kubeletconf
|
|
scored: true
|
|
|
|
- id: 2.2.10
|
|
text: Ensure that the kubelet configuration file has permissions set to 644 or more restrictive (Scored)
|
|
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'' '
|
|
tests:
|
|
test_items:
|
|
- flag: "644"
|
|
set: true
|
|
compare:
|
|
op: eq
|
|
value: "644"
|
|
- flag: "640"
|
|
set: true
|
|
compare:
|
|
op: eq
|
|
value: "640"
|
|
- flag: "600"
|
|
set: true
|
|
compare:
|
|
op: eq
|
|
value: "600"
|
|
bin_op: or
|
|
remediation: |
|
|
Run the following command (using the config file location identied in the Audit step)
|
|
chmod 644 $kubeletconf
|
|
scored: true
|