mirror of
https://github.com/aquasecurity/kube-bench.git
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a9422a6623
* Overhaul K3s 1.X checks Signed-off-by: Derek Nola <derek.nola@suse.com> * Overhaul K3s 2.X Checks Signed-off-by: Derek Nola <derek.nola@suse.com> * Overhaul K3s 4.X checks Signed-off-by: Derek Nola <derek.nola@suse.com> * Overhaul K3s 5.X checks Signed-off-by: Derek Nola <derek.nola@suse.com> * Add K3s cis-1.8 scan Signed-off-by: Derek Nola <derek.nola@suse.com> * Fix K3s 1.1.10 check Signed-off-by: Derek Nola <derek.nola@suse.com> * Merge journalctl checks for K3s Signed-off-by: Derek Nola <derek.nola@suse.com> * Matched Manual/Automated to correct scoring (false/true) Signed-off-by: Derek Nola <derek.nola@suse.com> * Remove incorrect use of check_for_default_sa.sh script Signed-off-by: Derek Nola <derek.nola@suse.com> --------- Signed-off-by: Derek Nola <derek.nola@suse.com> Co-authored-by: afdesk <work@afdesk.com>
986 lines
44 KiB
YAML
986 lines
44 KiB
YAML
---
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controls:
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version: "k3s-cis-1.8"
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id: 1
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text: "Control Plane Security Configuration"
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type: "master"
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groups:
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- id: 1.1
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text: "Control Plane Node Configuration Files"
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checks:
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- id: 1.1.1
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text: "Ensure that the API server pod specification file permissions are set to 600 or more restrictive (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $apiserverconf; then stat -c permissions=%a $apiserverconf; 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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Not Applicable.
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By default, K3s embeds the api server within the k3s process. There is no API server pod specification file.
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scored: true
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- id: 1.1.2
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text: "Ensure that the API server pod specification file ownership is set to root:root (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $apiserverconf; then stat -c %U:%G $apiserverconf; 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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Not Applicable.
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By default, K3s embeds the api server within the k3s process. There is no API server pod specification file.
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scored: true
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- id: 1.1.3
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text: "Ensure that the controller manager pod specification file permissions are set to 600 or more restrictive (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $controllermanagerconf; then stat -c permissions=%a $controllermanagerconf; 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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Not Applicable.
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By default, K3s embeds the controller manager within the k3s process. There is no controller manager pod specification file.
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scored: true
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- id: 1.1.4
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text: "Ensure that the controller manager pod specification file ownership is set to root:root (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $controllermanagerconf; then stat -c %U:%G $controllermanagerconf; 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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Not Applicable.
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By default, K3s embeds the controller manager within the k3s process. There is no controller manager pod specification file.
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scored: true
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- id: 1.1.5
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text: "Ensure that the scheduler pod specification file permissions are set to 600 or more restrictive (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $schedulerconf; then stat -c permissions=%a $schedulerconf; 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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Not Applicable.
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By default, K3s embeds the scheduler within the k3s process. There is no scheduler pod specification file.
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scored: true
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- id: 1.1.6
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text: "Ensure that the scheduler pod specification file ownership is set to root:root (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $schedulerconf; then stat -c %U:%G $schedulerconf; 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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Not Applicable.
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By default, K3s embeds the scheduler within the k3s process. There is no scheduler pod specification file.
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scored: true
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- id: 1.1.7
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text: "Ensure that the etcd pod specification file permissions are set to 600 or more restrictive (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $etcdconf; then find $etcdconf -name '*etcd*' | xargs stat -c permissions=%a; fi'"
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use_multiple_values: true
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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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Not Applicable.
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By default, K3s embeds etcd within the k3s process. There is no etcd pod specification file.
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scored: true
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- id: 1.1.8
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text: "Ensure that the etcd pod specification file ownership is set to root:root (Automated)"
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type: "skip"
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audit: "/bin/sh -c 'if test -e $etcdconf; then find $etcdconf -name '*etcd*' | xargs stat -c %U:%G; fi'"
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use_multiple_values: true
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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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Not Applicable.
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By default, K3s embeds etcd within the k3s process. There is no etcd pod specification file.
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scored: true
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- id: 1.1.9
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text: "Ensure that the Container Network Interface file permissions are set to 600 or more restrictive (Automated)"
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audit: find /var/lib/cni/networks -type f ! -name lock 2> /dev/null | xargs --no-run-if-empty stat -c permissions=%a
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use_multiple_values: true
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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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By default, K3s sets the CNI file permissions to 600.
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Note that for many CNIs, a lock file is created with permissions 750. This is expected and can be ignored.
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If you modify your CNI configuration, ensure that the permissions are set to 600.
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For example, chmod 600 /var/lib/cni/networks/<filename>
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scored: true
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- id: 1.1.10
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text: "Ensure that the Container Network Interface file ownership is set to root:root (Automated)"
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audit: find /var/lib/cni/networks -type f 2> /dev/null | xargs --no-run-if-empty stat -c %U:%G
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use_multiple_values: true
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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 control plane node.
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For example,
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chown root:root /var/lib/cni/networks/<filename>
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scored: true
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- id: 1.1.11
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text: "Ensure that the etcd data directory permissions are set to 700 or more restrictive (Automated)"
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audit: |
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if [ "$(journalctl -m -u k3s | grep -m1 'Managed etcd cluster' | wc -l)" -gt 0 ]; then
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stat -c permissions=%a /var/lib/rancher/k3s/server/db/etcd
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else
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echo "permissions=700"
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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: "700"
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remediation: |
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On the etcd server node, get the etcd data directory, passed as an argument --data-dir,
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from the command 'ps -ef | grep etcd'.
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Run the below command (based on the etcd data directory found above). For example,
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chmod 700 /var/lib/etcd
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scored: true
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- id: 1.1.12
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text: "Ensure that the etcd data directory ownership is set to etcd:etcd (Automated)"
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audit: ps -ef | grep $etcdbin | grep -- --data-dir | sed 's%.*data-dir[= ]\([^ ]*\).*%\1%' | xargs stat -c %U:%G
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type: "skip"
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tests:
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test_items:
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- flag: "etcd:etcd"
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remediation: |
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Not Applicable.
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For K3s, etcd is embedded within the k3s process. There is no separate etcd process.
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Therefore the etcd data directory ownership is managed by the k3s process and should be root:root.
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scored: true
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- id: 1.1.13
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text: "Ensure that the admin.conf file permissions are set to 600 or more restrictive (Automated)"
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audit: "/bin/sh -c 'if test -e /var/lib/rancher/k3s/server/cred/admin.kubeconfig; then stat -c permissions=%a /var/lib/rancher/k3s/server/cred/admin.kubeconfig; 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 control plane node.
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For example, chmod 600 /var/lib/rancher/k3s/server/cred/admin.kubeconfig
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scored: true
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- id: 1.1.14
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text: "Ensure that the admin.conf file ownership is set to root:root (Automated)"
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audit: "/bin/sh -c 'if test -e /var/lib/rancher/k3s/server/cred/admin.kubeconfig; then stat -c %U:%G /var/lib/rancher/k3s/server/cred/admin.kubeconfig; 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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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 control plane node.
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For example, chown root:root /var/lib/rancher/k3s/server/cred/admin.kubeconfig
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scored: true
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- id: 1.1.15
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text: "Ensure that the scheduler.conf file permissions are set to 600 or more restrictive (Automated)"
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audit: "/bin/sh -c 'if test -e $schedulerkubeconfig; then stat -c permissions=%a $schedulerkubeconfig; 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 control plane node.
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For example,
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chmod 600 $schedulerkubeconfig
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scored: true
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- id: 1.1.16
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text: "Ensure that the scheduler.conf file ownership is set to root:root (Automated)"
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audit: "/bin/sh -c 'if test -e $schedulerkubeconfig; then stat -c %U:%G $schedulerkubeconfig; 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 control plane node.
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For example,
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chown root:root $schedulerkubeconfig
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scored: true
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- id: 1.1.17
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text: "Ensure that the controller-manager.conf file permissions are set to 600 or more restrictive (Automated)"
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audit: "/bin/sh -c 'if test -e $controllermanagerkubeconfig; then stat -c permissions=%a $controllermanagerkubeconfig; 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 control plane node.
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For example,
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chmod 600 $controllermanagerkubeconfig
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scored: true
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- id: 1.1.18
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text: "Ensure that the controller-manager.conf file ownership is set to root:root (Automated)"
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audit: "stat -c %U:%G $controllermanagerkubeconfig"
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tests:
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test_items:
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- flag: "root:root"
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compare:
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op: eq
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value: "root:root"
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set: true
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remediation: |
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Run the below command (based on the file location on your system) on the control plane node.
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For example,
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chown root:root $controllermanagerkubeconfig
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scored: true
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- id: 1.1.19
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text: "Ensure that the Kubernetes PKI directory and file ownership is set to root:root (Automated)"
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audit: "stat -c %U:%G /var/lib/rancher/k3s/server/tls"
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use_multiple_values: true
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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 control plane node.
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For example,
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chown -R root:root /var/lib/rancher/k3s/server/tls
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scored: true
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- id: 1.1.20
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text: "Ensure that the Kubernetes PKI certificate file permissions are set to 600 or more restrictive (Manual)"
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audit: "/bin/sh -c 'stat -c permissions=%a /var/lib/rancher/k3s/server/tls/*.crt'"
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use_multiple_values: true
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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 master node.
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For example,
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chmod -R 600 /var/lib/rancher/k3s/server/tls/*.crt
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scored: false
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- id: 1.1.21
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text: "Ensure that the Kubernetes PKI key file permissions are set to 600 (Automated)"
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audit: "/bin/sh -c 'stat -c permissions=%a /var/lib/rancher/k3s/server/tls/*.key'"
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use_multiple_values: true
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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 master node.
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For example,
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chmod -R 600 /var/lib/rancher/k3s/server/tls/*.key
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scored: true
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- id: 1.2
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text: "API Server"
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checks:
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- id: 1.2.1
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text: "Ensure that the --anonymous-auth argument is set to false (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'anonymous-auth'"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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compare:
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op: eq
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value: false
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remediation: |
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By default, K3s sets the --anonymous-auth argument to false.
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If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove anything similar to below.
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kube-apiserver-arg:
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- "anonymous-auth=true"
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scored: true
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- id: 1.2.2
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text: "Ensure that the --token-auth-file parameter is not set (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
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tests:
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test_items:
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- flag: "--token-auth-file"
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set: false
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remediation: |
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Follow the documentation and configure alternate mechanisms for authentication.
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If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove anything similar to below.
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kube-apiserver-arg:
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- "token-auth-file=<path>"
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scored: true
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- id: 1.2.3
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text: "Ensure that the --DenyServiceExternalIPs is not set (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
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tests:
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bin_op: or
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test_items:
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- flag: "--enable-admission-plugins"
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compare:
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op: nothave
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value: "DenyServiceExternalIPs"
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set: true
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- flag: "--enable-admission-plugins"
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set: false
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remediation: |
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By default, K3s does not set DenyServiceExternalIPs.
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If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml, remove any lines like below.
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kube-apiserver-arg:
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- "enable-admission-plugins=DenyServiceExternalIPs"
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scored: true
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- id: 1.2.4
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text: "Ensure that the --kubelet-client-certificate and --kubelet-client-key arguments are set as appropriate (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
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tests:
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bin_op: and
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test_items:
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- flag: "--kubelet-client-certificate"
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- flag: "--kubelet-client-key"
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remediation: |
|
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By default, K3s automatically provides the kubelet client certificate and key.
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They are generated and located at /var/lib/rancher/k3s/server/tls/client-kube-apiserver.crt and /var/lib/rancher/k3s/server/tls/client-kube-apiserver.key
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If for some reason you need to provide your own certificate and key, you can set the
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below parameters in the K3s config file /etc/rancher/k3s/config.yaml.
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kube-apiserver-arg:
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- "kubelet-client-certificate=<path/to/client-cert-file>"
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- "kubelet-client-key=<path/to/client-key-file>"
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scored: true
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- id: 1.2.5
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text: "Ensure that the --kubelet-certificate-authority argument is set as appropriate (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'kubelet-certificate-authority'"
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tests:
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test_items:
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- flag: "--kubelet-certificate-authority"
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remediation: |
|
|
By default, K3s automatically provides the kubelet CA cert file, at /var/lib/rancher/k3s/server/tls/server-ca.crt.
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If for some reason you need to provide your own ca certificate, look at using the k3s certificate command line tool.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
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|
kube-apiserver-arg:
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- "kubelet-certificate-authority=<path/to/ca-cert-file>"
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scored: true
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|
|
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- id: 1.2.6
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text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Automated)"
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audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'authorization-mode'"
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tests:
|
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test_items:
|
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- flag: "--authorization-mode"
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compare:
|
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op: nothave
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value: "AlwaysAllow"
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remediation: |
|
|
By default, K3s does not set the --authorization-mode to AlwaysAllow.
|
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If this check fails, edit K3s config file /etc/rancher/k3s/config.yaml, remove any lines like below.
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kube-apiserver-arg:
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- "authorization-mode=AlwaysAllow"
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scored: true
|
|
|
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- id: 1.2.7
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text: "Ensure that the --authorization-mode argument includes Node (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'authorization-mode'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--authorization-mode"
|
|
compare:
|
|
op: has
|
|
value: "Node"
|
|
remediation: |
|
|
By default, K3s sets the --authorization-mode to Node and RBAC.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml,
|
|
ensure that you are not overriding authorization-mode.
|
|
scored: true
|
|
|
|
- id: 1.2.8
|
|
text: "Ensure that the --authorization-mode argument includes RBAC (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'authorization-mode'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--authorization-mode"
|
|
compare:
|
|
op: has
|
|
value: "RBAC"
|
|
remediation: |
|
|
By default, K3s sets the --authorization-mode to Node and RBAC.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml,
|
|
ensure that you are not overriding authorization-mode.
|
|
scored: true
|
|
|
|
- id: 1.2.9
|
|
text: "Ensure that the admission control plugin EventRateLimit is set (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'enable-admission-plugins'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: has
|
|
value: "EventRateLimit"
|
|
remediation: |
|
|
Follow the Kubernetes documentation and set the desired limits in a configuration file.
|
|
Then, edit the K3s config file /etc/rancher/k3s/config.yaml and set the below parameters.
|
|
kube-apiserver-arg:
|
|
- "enable-admission-plugins=...,EventRateLimit,..."
|
|
- "admission-control-config-file=<path/to/configuration/file>"
|
|
scored: false
|
|
|
|
- id: 1.2.10
|
|
text: "Ensure that the admission control plugin AlwaysAdmit is not set (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'enable-admission-plugins'"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: nothave
|
|
value: AlwaysAdmit
|
|
- flag: "--enable-admission-plugins"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s does not set the --enable-admission-plugins to AlwaysAdmit.
|
|
If this check fails, edit K3s config file /etc/rancher/k3s/config.yaml, remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "enable-admission-plugins=AlwaysAdmit"
|
|
scored: true
|
|
|
|
- id: 1.2.11
|
|
text: "Ensure that the admission control plugin AlwaysPullImages is set (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: has
|
|
value: "AlwaysPullImages"
|
|
remediation: |
|
|
Permissive, per CIS guidelines,
|
|
"This setting could impact offline or isolated clusters, which have images pre-loaded and
|
|
do not have access to a registry to pull in-use images. This setting is not appropriate for
|
|
clusters which use this configuration."
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml and set the below parameter.
|
|
kube-apiserver-arg:
|
|
- "enable-admission-plugins=...,AlwaysPullImages,..."
|
|
scored: false
|
|
|
|
- id: 1.2.12
|
|
text: "Ensure that the admission control plugin SecurityContextDeny is set if PodSecurityPolicy is not used (Manual)"
|
|
type: "skip"
|
|
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: has
|
|
value: "SecurityContextDeny"
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: has
|
|
value: "PodSecurityPolicy"
|
|
remediation: |
|
|
Not Applicable.
|
|
Enabling Pod Security Policy is no longer supported on K3s v1.25+ and will cause applications to unexpectedly fail.
|
|
scored: false
|
|
|
|
- id: 1.2.13
|
|
text: "Ensure that the admission control plugin ServiceAccount is set (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--disable-admission-plugins"
|
|
compare:
|
|
op: nothave
|
|
value: "ServiceAccount"
|
|
- flag: "--disable-admission-plugins"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s does not set the --disable-admission-plugins to anything.
|
|
Follow the documentation and create ServiceAccount objects as per your environment.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "disable-admission-plugins=ServiceAccount"
|
|
scored: true
|
|
|
|
- id: 1.2.14
|
|
text: "Ensure that the admission control plugin NamespaceLifecycle is set (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--disable-admission-plugins"
|
|
compare:
|
|
op: nothave
|
|
value: "NamespaceLifecycle"
|
|
- flag: "--disable-admission-plugins"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s does not set the --disable-admission-plugins to anything.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "disable-admission-plugins=...,NamespaceLifecycle,..."
|
|
scored: true
|
|
|
|
- id: 1.2.15
|
|
text: "Ensure that the admission control plugin NodeRestriction is set (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'enable-admission-plugins'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--enable-admission-plugins"
|
|
compare:
|
|
op: has
|
|
value: "NodeRestriction"
|
|
remediation: |
|
|
By default, K3s sets the --enable-admission-plugins to NodeRestriction.
|
|
If using the K3s config file /etc/rancher/k3s/config.yaml, check that you are not overriding the admission plugins.
|
|
If you are, include NodeRestriction in the list.
|
|
kube-apiserver-arg:
|
|
- "enable-admission-plugins=...,NodeRestriction,..."
|
|
scored: true
|
|
|
|
- id: 1.2.16
|
|
text: "Ensure that the --profiling argument is set to false (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'profiling'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--profiling"
|
|
compare:
|
|
op: eq
|
|
value: false
|
|
remediation: |
|
|
By default, K3s sets the --profiling argument to false.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "profiling=true"
|
|
scored: true
|
|
|
|
- id: 1.2.17
|
|
text: "Ensure that the --audit-log-path argument is set (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--audit-log-path"
|
|
remediation: |
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml and set the audit-log-path parameter to a suitable path and
|
|
file where you would like audit logs to be written, for example,
|
|
kube-apiserver-arg:
|
|
- "audit-log-path=/var/lib/rancher/k3s/server/logs/audit.log"
|
|
scored: false
|
|
|
|
- id: 1.2.18
|
|
text: "Ensure that the --audit-log-maxage argument is set to 30 or as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--audit-log-maxage"
|
|
compare:
|
|
op: gte
|
|
value: 30
|
|
remediation: |
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node and
|
|
set the audit-log-maxage parameter to 30 or as an appropriate number of days, for example,
|
|
kube-apiserver-arg:
|
|
- "audit-log-maxage=30"
|
|
scored: false
|
|
|
|
- id: 1.2.19
|
|
text: "Ensure that the --audit-log-maxbackup argument is set to 10 or as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--audit-log-maxbackup"
|
|
compare:
|
|
op: gte
|
|
value: 10
|
|
remediation: |
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node and
|
|
set the audit-log-maxbackup parameter to 10 or to an appropriate value. For example,
|
|
kube-apiserver-arg:
|
|
- "audit-log-maxbackup=10"
|
|
scored: false
|
|
|
|
- id: 1.2.20
|
|
text: "Ensure that the --audit-log-maxsize argument is set to 100 or as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--audit-log-maxsize"
|
|
compare:
|
|
op: gte
|
|
value: 100
|
|
remediation: |
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node and
|
|
set the audit-log-maxsize parameter to an appropriate size in MB. For example,
|
|
kube-apiserver-arg:
|
|
- "audit-log-maxsize=100"
|
|
scored: false
|
|
|
|
- id: 1.2.21
|
|
text: "Ensure that the --request-timeout argument is set as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--request-timeout"
|
|
remediation: |
|
|
Permissive, per CIS guidelines,
|
|
"it is recommended to set this limit as appropriate and change the default limit of 60 seconds only if needed".
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml
|
|
and set the below parameter if needed. For example,
|
|
kube-apiserver-arg:
|
|
- "request-timeout=300s"
|
|
scored: false
|
|
|
|
- id: 1.2.22
|
|
text: "Ensure that the --service-account-lookup argument is set to true (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--service-account-lookup"
|
|
set: false
|
|
- flag: "--service-account-lookup"
|
|
compare:
|
|
op: eq
|
|
value: true
|
|
remediation: |
|
|
By default, K3s does not set the --service-account-lookup argument.
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml and set the service-account-lookup. For example,
|
|
kube-apiserver-arg:
|
|
- "service-account-lookup=true"
|
|
Alternatively, you can delete the service-account-lookup parameter from this file so
|
|
that the default takes effect.
|
|
scored: true
|
|
|
|
- id: 1.2.23
|
|
text: "Ensure that the --service-account-key-file argument is set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1"
|
|
tests:
|
|
test_items:
|
|
- flag: "--service-account-key-file"
|
|
remediation: |
|
|
K3s automatically generates and sets the service account key file.
|
|
It is located at /var/lib/rancher/k3s/server/tls/service.key.
|
|
If this check fails, edit K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "service-account-key-file=<path>"
|
|
scored: true
|
|
|
|
- id: 1.2.24
|
|
text: "Ensure that the --etcd-certfile and --etcd-keyfile arguments are set as appropriate (Automated)"
|
|
audit: |
|
|
if [ "$(journalctl -m -u k3s | grep -m1 'Managed etcd cluster' | wc -l)" -gt 0 ]; then
|
|
journalctl -m -u k3s | grep -m1 'Running kube-apiserver' | tail -n1
|
|
else
|
|
echo "--etcd-certfile AND --etcd-keyfile"
|
|
fi
|
|
tests:
|
|
bin_op: and
|
|
test_items:
|
|
- flag: "--etcd-certfile"
|
|
set: true
|
|
- flag: "--etcd-keyfile"
|
|
set: true
|
|
remediation: |
|
|
K3s automatically generates and sets the etcd certificate and key files.
|
|
They are located at /var/lib/rancher/k3s/server/tls/etcd/client.crt and /var/lib/rancher/k3s/server/tls/etcd/client.key.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "etcd-certfile=<path>"
|
|
- "etcd-keyfile=<path>"
|
|
scored: true
|
|
|
|
- id: 1.2.25
|
|
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep -A1 'Running kube-apiserver' | tail -n2"
|
|
tests:
|
|
bin_op: and
|
|
test_items:
|
|
- flag: "--tls-cert-file"
|
|
set: true
|
|
- flag: "--tls-private-key-file"
|
|
set: true
|
|
remediation: |
|
|
By default, K3s automatically generates and provides the TLS certificate and private key for the apiserver.
|
|
They are generated and located at /var/lib/rancher/k3s/server/tls/serving-kube-apiserver.crt and /var/lib/rancher/k3s/server/tls/serving-kube-apiserver.key
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "tls-cert-file=<path>"
|
|
- "tls-private-key-file=<path>"
|
|
scored: true
|
|
|
|
- id: 1.2.26
|
|
text: "Ensure that the --client-ca-file argument is set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'client-ca-file'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--client-ca-file"
|
|
remediation: |
|
|
By default, K3s automatically provides the client certificate authority file.
|
|
It is generated and located at /var/lib/rancher/k3s/server/tls/client-ca.crt.
|
|
If for some reason you need to provide your own ca certificate, look at using the k3s certificate command line tool.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "client-ca-file=<path>"
|
|
scored: true
|
|
|
|
- id: 1.2.27
|
|
text: "Ensure that the --etcd-cafile argument is set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'etcd-cafile'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--etcd-cafile"
|
|
remediation: |
|
|
By default, K3s automatically provides the etcd certificate authority file.
|
|
It is generated and located at /var/lib/rancher/k3s/server/tls/client-ca.crt.
|
|
If for some reason you need to provide your own ca certificate, look at using the k3s certificate command line tool.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-apiserver-arg:
|
|
- "etcd-cafile=<path>"
|
|
scored: true
|
|
|
|
- id: 1.2.28
|
|
text: "Ensure that the --encryption-provider-config argument is set as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'encryption-provider-config'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--encryption-provider-config"
|
|
remediation: |
|
|
K3s can be configured to use encryption providers to encrypt secrets at rest.
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node and set the below parameter.
|
|
secrets-encryption: true
|
|
Secrets encryption can then be managed with the k3s secrets-encrypt command line tool.
|
|
If needed, you can find the generated encryption config at /var/lib/rancher/k3s/server/cred/encryption-config.json.
|
|
scored: false
|
|
|
|
- id: 1.2.29
|
|
text: "Ensure that encryption providers are appropriately configured (Manual)"
|
|
audit: |
|
|
ENCRYPTION_PROVIDER_CONFIG=$(journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep -- --encryption-provider-config | sed 's%.*encryption-provider-config[= ]\([^ ]*\).*%\1%')
|
|
if test -e $ENCRYPTION_PROVIDER_CONFIG; then grep -o 'providers\"\:\[.*\]' $ENCRYPTION_PROVIDER_CONFIG | grep -o "[A-Za-z]*" | head -2 | tail -1 | sed 's/^/provider=/'; fi
|
|
tests:
|
|
test_items:
|
|
- flag: "provider"
|
|
compare:
|
|
op: valid_elements
|
|
value: "aescbc,kms,secretbox"
|
|
remediation: |
|
|
K3s can be configured to use encryption providers to encrypt secrets at rest. K3s will utilize the aescbc provider.
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node and set the below parameter.
|
|
secrets-encryption: true
|
|
Secrets encryption can then be managed with the k3s secrets-encrypt command line tool.
|
|
If needed, you can find the generated encryption config at /var/lib/rancher/k3s/server/cred/encryption-config.json
|
|
scored: false
|
|
|
|
- id: 1.2.30
|
|
text: "Ensure that the API Server only makes use of Strong Cryptographic Ciphers (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'tls-cipher-suites'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--tls-cipher-suites"
|
|
compare:
|
|
op: valid_elements
|
|
value: "TLS_AES_128_GCM_SHA256,TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_256_GCM_SHA384"
|
|
remediation: |
|
|
By default, the K3s kube-apiserver complies with this test. Changes to these values may cause regression, therefore ensure that all apiserver clients support the new TLS configuration before applying it in production deployments.
|
|
If a custom TLS configuration is required, consider also creating a custom version of this rule that aligns with your requirements.
|
|
If this check fails, remove any custom configuration around `tls-cipher-suites` or update the /etc/rancher/k3s/config.yaml file to match the default by adding the following:
|
|
kube-apiserver-arg:
|
|
- "tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,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_CHACHA20_POLY1305"
|
|
scored: true
|
|
|
|
- id: 1.3
|
|
text: "Controller Manager"
|
|
checks:
|
|
- id: 1.3.1
|
|
text: "Ensure that the --terminated-pod-gc-threshold argument is set as appropriate (Manual)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1 | grep 'terminated-pod-gc-threshold'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--terminated-pod-gc-threshold"
|
|
remediation: |
|
|
Edit the K3s config file /etc/rancher/k3s/config.yaml on the control plane node
|
|
and set the --terminated-pod-gc-threshold to an appropriate threshold,
|
|
kube-controller-manager-arg:
|
|
- "terminated-pod-gc-threshold=10"
|
|
scored: false
|
|
|
|
- id: 1.3.2
|
|
text: "Ensure that the --profiling argument is set to false (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1 | grep 'profiling'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--profiling"
|
|
compare:
|
|
op: eq
|
|
value: false
|
|
remediation: |
|
|
By default, K3s sets the --profiling argument to false.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "profiling=true"
|
|
scored: true
|
|
|
|
- id: 1.3.3
|
|
text: "Ensure that the --use-service-account-credentials argument is set to true (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1 | grep 'use-service-account-credentials'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--use-service-account-credentials"
|
|
compare:
|
|
op: noteq
|
|
value: false
|
|
remediation: |
|
|
By default, K3s sets the --use-service-account-credentials argument to true.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "use-service-account-credentials=false"
|
|
scored: true
|
|
|
|
- id: 1.3.4
|
|
text: "Ensure that the --service-account-private-key-file argument is set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1 | grep 'service-account-private-key-file'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--service-account-private-key-file"
|
|
remediation: |
|
|
By default, K3s automatically provides the service account private key file.
|
|
It is generated and located at /var/lib/rancher/k3s/server/tls/service.current.key.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "service-account-private-key-file=<path>"
|
|
scored: true
|
|
|
|
- id: 1.3.5
|
|
text: "Ensure that the --root-ca-file argument is set as appropriate (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1 | grep 'root-ca-file'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--root-ca-file"
|
|
remediation: |
|
|
By default, K3s automatically provides the root CA file.
|
|
It is generated and located at /var/lib/rancher/k3s/server/tls/server-ca.crt.
|
|
If for some reason you need to provide your own ca certificate, look at using the k3s certificate command line tool.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "root-ca-file=<path>"
|
|
scored: true
|
|
|
|
- id: 1.3.6
|
|
text: "Ensure that the RotateKubeletServerCertificate argument is set to true (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--feature-gates"
|
|
compare:
|
|
op: nothave
|
|
value: "RotateKubeletServerCertificate=false"
|
|
set: true
|
|
- flag: "--feature-gates"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s does not set the RotateKubeletServerCertificate feature gate.
|
|
If you have enabled this feature gate, you should remove it.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml, remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "feature-gate=RotateKubeletServerCertificate"
|
|
scored: true
|
|
|
|
- id: 1.3.7
|
|
text: "Ensure that the --bind-address argument is set to 127.0.0.1 (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-controller-manager' | tail -n1"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--bind-address"
|
|
compare:
|
|
op: eq
|
|
value: "127.0.0.1"
|
|
set: true
|
|
- flag: "--bind-address"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s sets the --bind-address argument to 127.0.0.1
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-controller-manager-arg:
|
|
- "bind-address=<IP>"
|
|
scored: true
|
|
|
|
- id: 1.4
|
|
text: "Scheduler"
|
|
checks:
|
|
- id: 1.4.1
|
|
text: "Ensure that the --profiling argument is set to false (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-scheduler' | tail -n1 | grep 'profiling'"
|
|
tests:
|
|
test_items:
|
|
- flag: "--profiling"
|
|
compare:
|
|
op: eq
|
|
value: false
|
|
set: true
|
|
remediation: |
|
|
By default, K3s sets the --profiling argument to false.
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-scheduler-arg:
|
|
- "profiling=true"
|
|
scored: true
|
|
|
|
- id: 1.4.2
|
|
text: "Ensure that the --bind-address argument is set to 127.0.0.1 (Automated)"
|
|
audit: "journalctl -m -u k3s | grep 'Running kube-scheduler' | tail -n1 | grep 'bind-address'"
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "--bind-address"
|
|
compare:
|
|
op: eq
|
|
value: "127.0.0.1"
|
|
set: true
|
|
- flag: "--bind-address"
|
|
set: false
|
|
remediation: |
|
|
By default, K3s sets the --bind-address argument to 127.0.0.1
|
|
If this check fails, edit the K3s config file /etc/rancher/k3s/config.yaml and remove any lines like below.
|
|
kube-scheduler-arg:
|
|
- "bind-address=<IP>"
|
|
scored: true
|