2017-10-05 17:29:38 +00:00
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---
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controls:
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2017-10-15 00:08:58 +00:00
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version: 1.8
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2017-10-05 17:29:38 +00:00
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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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2017-10-15 00:08:58 +00:00
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- id: 2.1.1
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text: "Ensure that the --allow-privileged argument is set to false (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "--allow-privileged"
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compare:
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op: eq
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value: false
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--allow-privileged=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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.2
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text: "Ensure that the --anonymous-auth argument is set to false (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.3
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text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.4
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text: "Ensure that the --client-ca-file argument is set as appropriate (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "--client-ca-file"
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.5
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text: "Ensure that the --read-only-port argument is set to 0 (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.6
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text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.7
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text: "Ensure that the --protect-kernel-defaults argument is set to true (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.8
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text: "Ensure that the --make-iptables-util-chains argument is set to true (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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bin_op: or
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.9
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text: "Ensure that the --keep-terminated-pod-volumes argument is set to false (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "--keep-terminated-pod-volumes"
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compare:
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op: eq
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value: false
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--keep-terminated-pod-volumes=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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.10
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text: "Ensure that the --hostname-override argument is not set (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.11
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text: "Ensure that the --event-qps argument is set to 0 (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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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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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and 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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2017-10-05 17:29:38 +00:00
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2017-10-15 00:08:58 +00:00
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- id: 2.1.12
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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: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "--tls-cert-file"
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set: true
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- flag: "--tls-private-key-file"
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set: true
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remediation: |
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Follow the Kubernetes documentation and set up the TLS connection on the Kubelet.
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Then edit the kubelet service file /etc/systemd/system/kubelet.service.d/10-
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kubeadm.conf on each worker node and set the below parameters in
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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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--tls-private-key-
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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 --cadvisor-port argument is set to 0 (Scored)"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "--cadvisor-port"
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compare:
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op: eq
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value: 0
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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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: true
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- id: 2.1.14
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text: "Ensure that the RotateKubeletClientCertificate argument is set to true"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "RotateKubeletClientCertificate"
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compare:
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op: eq
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value: true
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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on each worker node and remove the --feature-
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gates=RotateKubeletClientCertificate=false argument from the
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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: 2.1.15
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text: "Ensure that the RotateKubeletServerCertificate argument is set to true"
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audit: "ps -ef | grep $kubeletbin | grep -v grep"
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tests:
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test_items:
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- flag: "RotateKubeletServerCertificate"
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compare:
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op: eq
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value: true
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set: true
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remediation: |
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2017-11-28 17:33:42 +00:00
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Edit the kubelet service file $kubeletconf
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2017-10-15 00:08:58 +00:00
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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
|
2017-10-05 17:29:38 +00:00
|
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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
|
2017-10-15 00:08:58 +00:00
|
|
|
text: "Ensure that the kubelet.conf file permissions are set to 644 or
|
|
|
|
|
more restrictive (Scored)"
|
|
|
|
|
audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'"
|
2017-10-05 17:29:38 +00:00
|
|
|
tests:
|
|
|
|
|
bin_op: or
|
|
|
|
|
test_items:
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|
|
|
|
- flag: "644"
|
|
|
|
|
compare:
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|
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|
op: eq
|
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|
|
|
value: "644"
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|
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|
set: true
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|
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|
- flag: "640"
|
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|
|
compare:
|
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|
|
|
op: eq
|
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|
value: "640"
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|
set: true
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|
- flag: "600"
|
|
|
|
|
compare:
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|
|
op: eq
|
|
|
|
|
value: "600"
|
|
|
|
|
set: true
|
2017-10-15 00:08:58 +00:00
|
|
|
remediation: |
|
|
|
|
|
Run the below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
|
|
|
|
chmod 644 $kubeletconf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.2
|
2017-10-15 00:08:58 +00:00
|
|
|
text: "Ensure that the kubelet.conf file ownership is set to root:root (Scored)"
|
|
|
|
|
audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'"
|
2017-10-05 17:29:38 +00:00
|
|
|
tests:
|
|
|
|
|
test_items:
|
|
|
|
|
- flag: "root:root"
|
|
|
|
|
compare:
|
|
|
|
|
op: eq
|
|
|
|
|
value: root:root
|
|
|
|
|
set: true
|
2017-10-15 00:08:58 +00:00
|
|
|
remediation: |
|
|
|
|
|
Run the below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
|
|
|
|
chown root:root /etc/kubernetes/kubelet.conf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.3
|
2017-10-15 00:08:58 +00:00
|
|
|
text: "Ensure that the kubelet service file permissions are set to 644 or
|
|
|
|
|
more restrictive (Scored)"
|
2017-11-28 17:33:42 +00:00
|
|
|
audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %a $kubeletconf; fi'"
|
2017-10-05 17:29:38 +00:00
|
|
|
tests:
|
|
|
|
|
bin_op: or
|
|
|
|
|
test_items:
|
2017-10-15 00:08:58 +00:00
|
|
|
- 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 below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
2017-11-28 17:33:42 +00:00
|
|
|
chmod 755 $kubeletconf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.4
|
2018-06-18 11:44:25 +00:00
|
|
|
text: "2.2.4 Ensure that the kubelet service file ownership is set to root:root (Scored)"
|
2017-11-28 17:33:42 +00:00
|
|
|
audit: "/bin/sh -c 'if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'"
|
2017-10-05 17:29:38 +00:00
|
|
|
tests:
|
|
|
|
|
test_items:
|
2017-10-15 00:08:58 +00:00
|
|
|
- flag: "root:root"
|
|
|
|
|
set: true
|
|
|
|
|
remediation: |
|
|
|
|
|
Run the below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
2017-11-28 17:33:42 +00:00
|
|
|
chown root:root $kubeletconf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.5
|
2017-10-15 00:08:58 +00:00
|
|
|
text: "Ensure that the proxy kubeconfig file permissions are set to 644 or more
|
|
|
|
|
restrictive (Scored)"
|
2017-10-05 17:29:38 +00:00
|
|
|
audit: "/bin/sh -c 'if test -e $proxyconf; then stat -c %a $proxyconf; fi'"
|
|
|
|
|
tests:
|
|
|
|
|
bin_op: or
|
|
|
|
|
test_items:
|
2017-10-15 00:08:58 +00:00
|
|
|
- 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 below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
|
|
|
|
chmod 644 $proxyconf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.6
|
2017-10-15 00:08:58 +00:00
|
|
|
text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)"
|
2018-06-05 13:27:20 +00:00
|
|
|
audit: "/bin/sh -c 'if test -e $proxyconf; then stat -c %U:%G $proxyconf; fi'"
|
2017-10-05 17:29:38 +00:00
|
|
|
tests:
|
|
|
|
|
test_items:
|
2017-10-15 00:08:58 +00:00
|
|
|
- flag: "root:root"
|
|
|
|
|
set: true
|
|
|
|
|
remediation: |
|
|
|
|
|
Run the below command (based on the file location on your system) on the each worker
|
|
|
|
|
node. For example,
|
|
|
|
|
chown root:root $proxyconf
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.7
|
|
|
|
|
text: "Ensure that the certificate authorities file permissions are set to
|
2017-10-15 00:08:58 +00:00
|
|
|
644 or more restrictive (Scored)"
|
|
|
|
|
type: manual
|
|
|
|
|
remediation: |
|
|
|
|
|
Run the following command to modify the file permissions of the --client-ca-file
|
|
|
|
|
chmod 644 <filename>
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
|
|
|
|
|
|
|
|
|
- id: 2.2.8
|
|
|
|
|
text: "Ensure that the client certificate authorities file ownership is set to root:root"
|
|
|
|
|
audit: "/bin/sh -c 'if test -e $ca-file; then stat -c %U:%G $ca-file; fi'"
|
2017-10-15 00:08:58 +00:00
|
|
|
type: manual
|
|
|
|
|
remediation: |
|
|
|
|
|
Run the following command to modify the ownership of the --client-ca-file .
|
|
|
|
|
chown root:root <filename>
|
2017-10-05 17:29:38 +00:00
|
|
|
scored: true
|
