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update rke-cis-1.24 benchmarks: corrected errors and tests (#1570)

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corrected few benchmarks with title and respective tests
Handled type and title mismatch
Added missing audit commands
pull/1557/head^2
Kiran Bodipi 2 months ago committed by GitHub
parent 2374e7b07f
commit ee5e4aff51
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GPG Key ID: B5690EEEBB952194
4 changed files with 118 additions and 67 deletions
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2
cfg/rke-cis-1.24/controlplane.yaml
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@ -20,7 +20,7 @@ groups:
text: "Logging"
checks:
- id: 3.2.1
text: "Ensure that a minimal audit policy is created (Manual)"
text: "Ensure that a minimal audit policy is created (Automated)"
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
tests:
test_items:

74
cfg/rke-cis-1.24/master.yaml
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@ -9,15 +9,16 @@ groups:
text: "Control Plane Node Configuration Files"
checks:
- id: 1.1.1
text: "Ensure that the API server pod specification file permissions are set to 600 or more restrictive (Automated)"
type: "skip"
audit: "/bin/sh -c 'if test -e $apiserverconf; then stat -c permissions=%a $apiserverconf; fi'"
text: "Ensure that the API server pod specification file permissions are set to 644 or more restrictive (Automated)"
audit: "/bin/sh -c 'if test -e $apiserverconf; then stat -c permissions=%a $apiserverconf;else echo \"File not found\"; fi'"
tests:
bin_op: or
test_items:
- flag: "permissions"
compare:
op: bitmask
value: "600"
value: "644"
- flag: "File not found"
remediation: |
Cluster provisioned by RKE doesn't require or maintain a configuration file for kube-apiserver.
All configuration is passed in as arguments at container run time.
@ -138,7 +139,7 @@ groups:
scored: false
- id: 1.1.10
text: "Ensure that the Container Network Interface file ownership is set to root:root (Manual)"
text: "Ensure that the Container Network Interface file ownership is set to root:root (Automated)"
audit: |
ps -ef | grep $kubeletbin | grep -- --cni-conf-dir | sed 's%.*cni-conf-dir[= ]\([^ ]*\).*%\1%' | xargs -I{} find {} -mindepth 1 | xargs --no-run-if-empty stat -c %U:%G
find /var/lib/cni/networks -type f 2> /dev/null | xargs --no-run-if-empty stat -c %U:%G
@ -150,7 +151,7 @@ groups:
Run the below command (based on the file location on your system) on the control plane node.
For example,
chown root:root <path/to/cni/files>
scored: false
scored: true
- id: 1.1.11
text: "Ensure that the etcd data directory permissions are set to 700 or more restrictive (Automated)"
@ -286,11 +287,13 @@ groups:
scored: true
- id: 1.1.20
text: "Ensure that the Kubernetes PKI certificate file permissions are set to 600 or more restrictive (Manual)"
audit: "find /node/etc/kubernetes/ssl/ -name '*.pem' ! -name '*key.pem' | xargs stat -c permissions=%a"
use_multiple_values: true
text: "Ensure that the Kubernetes PKI certificate file permissions are set to 600 or more restrictive (Automated)"
audit: |
if test -n "$(find /node/etc/kubernetes/ssl/ -name '*.pem' ! -name '*key.pem')"; then find /node/etc/kubernetes/ssl/ -name '*.pem' ! -name '*key.pem' | xargs stat -c permissions=%a;else echo "File not found"; fi
tests:
bin_op: or
test_items:
- flag: "File not found"
- flag: "permissions"
compare:
op: bitmask
@ -299,23 +302,25 @@ groups:
Run the below command (based on the file location on your system) on the control plane node.
For example,
find /node/etc/kubernetes/ssl/ -name '*.pem' ! -name '*key.pem' -exec chmod -R 600 {} +
scored: false
scored: true
- id: 1.1.21
text: "Ensure that the Kubernetes PKI key file permissions are set to 600 (Manual)"
audit: "find /node/etc/kubernetes/ssl/ -name '*key.pem' | xargs stat -c permissions=%a"
use_multiple_values: true
text: "Ensure that the Kubernetes PKI key file permissions are set to 600 (Automated)"
audit: |
if test -n "$(find /node/etc/kubernetes/ssl/ -name '*.pem')"; then find /node/etc/kubernetes/ssl/ -name '*.pem' | xargs stat -c permissions=%a;else echo \"File not found\"; fi
tests:
bin_op: or
test_items:
- flag: "permissions"
compare:
op: bitmask
value: "600"
- flag: "File not found"
remediation: |
Run the below command (based on the file location on your system) on the control plane node.
For example,
find /node/etc/kubernetes/ssl/ -name '*key.pem' -exec chmod -R 600 {} +
scored: false
scored: true
- id: 1.2
text: "API Server"
@ -369,20 +374,17 @@ groups:
scored: true
- id: 1.2.4
text: "Ensure that the --kubelet-client-certificate and --kubelet-client-key arguments are set as appropriate (Automated)"
text: "Ensure that the --kubelet-https argument is set to true (Automated)"
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
tests:
bin_op: and
test_items:
- flag: "--kubelet-client-certificate"
- flag: "--kubelet-client-key"
- flag: "--kubelet-https"
compare:
op: eq
value: true
remediation: |
Follow the Kubernetes documentation and set up the TLS connection between the
apiserver and kubelets. Then, edit API server pod specification file
$apiserverconf on the control plane node and set the
kubelet client certificate and key parameters as below.
--kubelet-client-certificate=<path/to/client-certificate-file>
--kubelet-client-key=<path/to/client-key-file>
Edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml
on the control plane node and remove the --kubelet-https parameter.
scored: true
- id: 1.2.5
@ -406,7 +408,6 @@ groups:
- id: 1.2.6
text: "Ensure that the --kubelet-certificate-authority argument is set as appropriate (Automated)"
type: "skip"
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
tests:
test_items:
@ -471,7 +472,7 @@ groups:
scored: true
- id: 1.2.10
text: "Ensure that the admission control plugin EventRateLimit is set (Manual)"
text: "Ensure that the admission control plugin EventRateLimit is set (Automated)"
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
tests:
test_items:
@ -486,7 +487,7 @@ groups:
and set the below parameters.
--enable-admission-plugins=...,EventRateLimit,...
--admission-control-config-file=<path/to/configuration/file>
scored: false
scored: true
- id: 1.2.11
text: "Ensure that the admission control plugin AlwaysAdmit is not set (Automated)"
@ -521,7 +522,7 @@ groups:
on the control plane node and set the --enable-admission-plugins parameter to include
AlwaysPullImages.
--enable-admission-plugins=...,AlwaysPullImages,...
scored: false
scored: true
- id: 1.2.13
text: "Ensure that the admission control plugin SecurityContextDeny is set if PodSecurityPolicy is not used (Automated)"
@ -542,7 +543,7 @@ groups:
on the control plane node and set the --enable-admission-plugins parameter to include
SecurityContextDeny, unless PodSecurityPolicy is already in place.
--enable-admission-plugins=...,SecurityContextDeny,...
scored: false
scored: true
- id: 1.2.14
text: "Ensure that the admission control plugin ServiceAccount is set (Automated)"
@ -810,8 +811,7 @@ groups:
scored: true
- id: 1.2.30
text: "Ensure that the --encryption-provider-config argument is set as appropriate (Manual)"
type: "skip"
text: "Ensure that the --encryption-provider-config argument is set as appropriate (Automated)"
audit: "/bin/ps -ef | grep $apiserverbin | grep -v grep"
tests:
test_items:
@ -822,11 +822,10 @@ groups:
Then, edit the API server pod specification file $apiserverconf
on the control plane node and set the --encryption-provider-config parameter to the path of that file.
For example, --encryption-provider-config=</path/to/EncryptionConfig/File>
scored: false
scored: true
- id: 1.2.31
text: "Ensure that encryption providers are appropriately configured (Manual)"
type: "skip"
text: "Ensure that encryption providers are appropriately configured (Automated)"
audit: |
ENCRYPTION_PROVIDER_CONFIG=$(ps -ef | grep $apiserverbin | grep -- --encryption-provider-config | sed 's%.*encryption-provider-config[= ]\([^ ]*\).*%\1%')
if test -e $ENCRYPTION_PROVIDER_CONFIG; then grep -A1 'providers:' $ENCRYPTION_PROVIDER_CONFIG | tail -n1 | grep -o "[A-Za-z]*" | sed 's/^/provider=/'; fi
@ -840,7 +839,7 @@ groups:
Follow the Kubernetes documentation and configure a EncryptionConfig file.
In this file, choose aescbc, kms or secretbox as the encryption provider.
Enabling encryption changes how data can be recovered as data is encrypted.
scored: false
scored: true
- id: 1.2.32
text: "Ensure that the API Server only makes use of Strong Cryptographic Ciphers (Automated)"
@ -862,13 +861,13 @@ groups:
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
scored: false
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)"
text: "Ensure that the --terminated-pod-gc-threshold argument is set as appropriate (Automated)"
audit: "/bin/ps -ef | grep $controllermanagerbin | grep -v grep"
tests:
test_items:
@ -941,7 +940,6 @@ groups:
- id: 1.3.6
text: "Ensure that the RotateKubeletServerCertificate argument is set to true (Automated)"
type: "skip"
audit: "/bin/ps -ef | grep $controllermanagerbin | grep -v grep"
tests:
bin_op: or

21
cfg/rke-cis-1.24/node.yaml
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@ -10,7 +10,6 @@ groups:
checks:
- id: 4.1.1
text: "Ensure that the kubelet service file permissions are set to 600 or more restrictive (Automated)"
type: "skip"
audit: '/bin/sh -c ''if test -e $kubeletsvc; then stat -c permissions=%a $kubeletsvc; fi'' '
tests:
test_items:
@ -37,7 +36,7 @@ groups:
scored: true
- id: 4.1.3
text: "If proxy kubeconfig file exists ensure permissions are set to 600 or more restrictive (Manual)"
text: "If proxy kubeconfig file exists ensure permissions are set to 600 or more restrictive (Automated)"
audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c permissions=%a $proxykubeconfig; fi'' '
tests:
bin_op: or
@ -54,10 +53,9 @@ groups:
scored: true
- id: 4.1.4
text: "If proxy kubeconfig file exists ensure ownership is set to root:root (Manual)"
text: "If proxy kubeconfig file exists ensure ownership is set to root:root (Automated)"
audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %U:%G $proxykubeconfig; fi'' '
tests:
bin_op: or
test_items:
- flag: root:root
remediation: |
@ -121,8 +119,7 @@ groups:
scored: true
- id: 4.1.9
text: "If the kubelet config.yaml configuration file is being used validate permissions set to 600 or more restrictive (Manual)"
type: "skip"
text: "If the kubelet config.yaml configuration file is being used validate permissions set to 600 or more restrictive (Automated)"
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c permissions=%a $kubeletconf; fi'' '
tests:
test_items:
@ -136,8 +133,7 @@ groups:
scored: true
- id: 4.1.10
text: "If the kubelet config.yaml configuration file is being used validate file ownership is set to root:root (Manual)"
type: "skip"
text: "If the kubelet config.yaml configuration file is being used validate file ownership is set to root:root (Automated)"
audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'' '
tests:
test_items:
@ -323,7 +319,7 @@ groups:
# This is one of those properties that can only be set as a command line argument.
# To check if the property is set as expected, we need to parse the kubelet command
# instead reading the Kubelet Configuration file.
type: "skip"
type: "manual"
audit: "/bin/ps -fC $kubeletbin "
tests:
test_items:
@ -361,8 +357,7 @@ groups:
scored: true
- id: 4.2.10
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Manual)"
type: "skip"
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/sh -c 'if test -e $kubeletconf; then /bin/cat $kubeletconf; fi' "
tests:
@ -384,7 +379,7 @@ groups:
systemctl daemon-reload
systemctl restart kubelet.service
When generating serving certificates, functionality could break in conjunction with hostname overrides which are required for certain cloud providers.
scored: false
scored: true
- id: 4.2.11
text: "Ensure that the --rotate-certificates argument is not set to false (Automated)"
@ -415,7 +410,7 @@ groups:
- id: 4.2.12
text: "Verify that the RotateKubeletServerCertificate argument is set to true (Manual)"
type: "skip"
type: "manual"
audit: "/bin/ps -fC $kubeletbin"
audit_config: "/bin/sh -c 'if test -e $kubeletconf; then /bin/cat $kubeletconf; fi' "
tests:

88
cfg/rke-cis-1.24/policies.yaml
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@ -43,7 +43,7 @@ groups:
- id: 5.1.5
text: "Ensure that default service accounts are not actively used. (Manual)"
type: "skip"
type: "manual"
audit: check_for_default_sa.sh
tests:
test_items:
@ -102,38 +102,78 @@ groups:
- id: 5.2.3
text: "Minimize the admission of containers wishing to share the host process ID namespace (Automated)"
type: "skip"
audit: |
kubectl get psp -o json | jq .items[] | jq -r 'select((.spec.hostPID == null) or (.spec.hostPID == false))' | jq .metadata.name | wc -l | xargs -I {} echo '--count={}'
tests:
bin_op: or
test_items:
- flag: "kubectl: not found"
- flag: "jq: not found"
- flag: count
compare:
op: gt
value: 0
remediation: |
Add policies to each namespace in the cluster which has user workloads to restrict the
admission of `hostPID` containers.
scored: false
scored: true
- id: 5.2.4
text: "Minimize the admission of containers wishing to share the host IPC namespace (Automated)"
type: "skip"
audit: |
kubectl get psp -o json | jq .items[] | jq -r 'select((.spec.hostIPC == null) or (.spec.hostIPC == false))' | jq .metadata.name | wc -l | xargs -I {} echo '--count={}'
tests:
bin_op: or
test_items:
- flag: "kubectl: not found"
- flag: "jq: not found"
- flag: count
compare:
op: gt
value: 0
remediation: |
Add policies to each namespace in the cluster which has user workloads to restrict the
admission of `hostIPC` containers.
scored: false
scored: true
- id: 5.2.5
text: "Minimize the admission of containers wishing to share the host network namespace (Automated)"
type: "skip"
audit: |
kubectl get psp -o json | jq .items[] | jq -r 'select((.spec.hostNetwork == null) or (.spec.hostNetwork == false))' | jq .metadata.name | wc -l | xargs -I {} echo '--count={}'
tests:
bin_op: or
test_items:
- flag: "kubectl: not found"
- flag: "jq: not found"
- flag: count
compare:
op: gt
value: 0
remediation: |
Add policies to each namespace in the cluster which has user workloads to restrict the
admission of `hostNetwork` containers.
scored: false
scored: true
- id: 5.2.6
text: "Minimize the admission of containers with allowPrivilegeEscalation (Automated)"
type: "manual"
audit: |
kubectl get psp -o json | jq .items[] | jq -r 'select((.spec.allowPrivilegeEscalation == null) or (.spec.allowPrivilegeEscalation == false))' | jq .metadata.name | wc -l | xargs -I {} echo '--count={}'
tests:
bin_op: or
test_items:
- flag: "kubectl: not found"
- flag: "jq: not found"
- flag: count
compare:
op: gt
value: 0
remediation: |
Add policies to each namespace in the cluster which has user workloads to restrict the
admission of containers with `.spec.allowPrivilegeEscalation` set to `true`.
scored: false
scored: true
- id: 5.2.7
text: "Minimize the admission of root containers (Automated)"
text: "Minimize the admission of root containers (Manual)"
type: "manual"
remediation: |
Create a policy for each namespace in the cluster, ensuring that either `MustRunAsNonRoot`
@ -141,7 +181,7 @@ groups:
scored: false
- id: 5.2.8
text: "Minimize the admission of containers with the NET_RAW capability (Automated)"
text: "Minimize the admission of containers with the NET_RAW capability (Manual)"
type: "manual"
remediation: |
Add policies to each namespace in the cluster which has user workloads to restrict the
@ -149,7 +189,7 @@ groups:
scored: false
- id: 5.2.9
text: "Minimize the admission of containers with added capabilities (Automated)"
text: "Minimize the admission of containers with added capabilities (Manual)"
type: "manual"
remediation: |
Ensure that `allowedCapabilities` is not present in policies for the cluster unless
@ -269,9 +309,27 @@ groups:
scored: false
- id: 5.7.4
text: "The default namespace should not be used (Manual)"
type: "skip"
text: "The default namespace should not be used (Automated)"
audit: |
#!/bin/bash
set -eE
handle_error() {
echo "false"
}
trap 'handle_error' ERR
count=$(kubectl get all -n default -o json | jq .items[] | jq -r 'select((.metadata.name!="kubernetes"))' | jq .metadata.name | wc -l)
if [[ ${count} -gt 0 ]]; then
echo "false"
exit
fi
echo "true"
tests:
bin_op: or
test_items:
- flag: "kubectl: not found"
- flag: "jq: not found"
- flag: "true"
remediation: |
Ensure that namespaces are created to allow for appropriate segregation of Kubernetes
resources and that all new resources are created in a specific namespace.
scored: false
scored: true

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