mirror of
https://github.com/aquasecurity/kube-bench.git
synced 2024-12-21 06:08:06 +00:00
454 lines
18 KiB
YAML
454 lines
18 KiB
YAML
---
|
|
controls:
|
|
version: rh-1.0
|
|
id: 4
|
|
text: "Worker Node Security Configuration"
|
|
type: "node"
|
|
groups:
|
|
- id: 4.1
|
|
text: "Worker Node Configuration Files"
|
|
checks:
|
|
- id: 4.1.1
|
|
text: "Ensure that the kubelet service file permissions are set to 644 or more restrictive (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n permissions=%a" /etc/systemd/system/kubelet.service
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
By default, the kubelet service file has permissions of 644.
|
|
scored: true
|
|
|
|
- id: 4.1.2
|
|
text: "Ensure that the kubelet service file ownership is set to root:root (Automated)"
|
|
audit: |
|
|
# Should return root:root for each node
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n %U:%G" /etc/systemd/system/kubelet.service
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
By default, the kubelet service file has ownership of root:root.
|
|
scored: true
|
|
|
|
- id: 4.1.3
|
|
text: "If proxy kubeconfig file exists ensure permissions are set to 644 or more restrictive (Manual)"
|
|
audit: |
|
|
for i in $(oc get pods -n openshift-sdn -l app=sdn -oname)
|
|
do
|
|
oc exec -n openshift-sdn $i -- stat -Lc "$i %n permissions=%a" /config/kube-proxy-config.yaml
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "permissions"
|
|
set: true
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
None needed.
|
|
scored: false
|
|
|
|
- id: 4.1.4
|
|
text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Manual)"
|
|
audit: |
|
|
for i in $(oc get pods -n openshift-sdn -l app=sdn -oname)
|
|
do
|
|
oc exec -n openshift-sdn $i -- stat -Lc "$i %n %U:%G" /config/kube-proxy-config.yaml
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
None required. The configuration is managed by OpenShift operators.
|
|
scored: false
|
|
|
|
- id: 4.1.5
|
|
text: "Ensure that the --kubeconfig kubelet.conf file permissions are set to 644 or more restrictive (Manual)"
|
|
audit: |
|
|
# Check permissions
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n permissions=%a" /etc/kubernetes/kubelet.conf
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
None required.
|
|
scored: false
|
|
|
|
- id: 4.1.6
|
|
text: "Ensure that the --kubeconfig kubelet.conf file ownership is set to root:root (Manual)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n %U:%G" /etc/kubernetes/kubelet.conf
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
None required.
|
|
scored: false
|
|
|
|
- id: 4.1.7
|
|
text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n permissions=%a" /etc/kubernetes/kubelet-ca.crt
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
None required.
|
|
scored: true
|
|
|
|
- id: 4.1.8
|
|
text: "Ensure that the client certificate authorities file ownership is set to root:root (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n %U:%G" /etc/kubernetes/kubelet-ca.crt
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
None required.
|
|
scored: true
|
|
|
|
- id: 4.1.9
|
|
text: "Ensure that the kubelet --config configuration file has permissions set to 644 or more restrictive (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n permissions=%a" /var/lib/kubelet/kubeconfig
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
None required.
|
|
scored: true
|
|
|
|
- id: 4.1.10
|
|
text: "Ensure that the kubelet configuration file ownership is set to root:root (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host stat -c "$node %n %U:%G" /var/lib/kubelet/kubeconfig
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
None required.
|
|
scored: true
|
|
|
|
- id: 4.2
|
|
text: "Kubelet"
|
|
checks:
|
|
- id: 4.2.1
|
|
text: "Ensure that the --anonymous-auth argument is set to false (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host grep -B4 -A1 anonymous /etc/kubernetes/kubelet.conf
|
|
done
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "enabled: true"
|
|
set: false
|
|
remediation: |
|
|
Follow the instructions in the documentation to create a Kubelet config CRD
|
|
and set the anonymous-auth is set to false.
|
|
scored: true
|
|
|
|
- id: 4.2.2
|
|
text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Manual)"
|
|
type: manual
|
|
# Takes a lot of time for connection to fail and
|
|
audit: |
|
|
POD=$(oc -n openshift-kube-apiserver get pod -l app=openshift-kube-apiserver -o jsonpath='{.items[0].metadata.name}')
|
|
TOKEN=$(oc whoami -t)
|
|
for name in $(oc get nodes -ojsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc exec -n openshift-kube-apiserver $POD -- curl -sS https://172.25.0.1/api/v1/nodes/$name/proxy/configz -k -H "Authorization:Bearer $TOKEN" | jq -r '.kubeletconfig.authorization.mode'
|
|
done
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "Connection timed out"
|
|
remediation: |
|
|
None required. Unauthenticated/Unauthorized users have no access to OpenShift nodes.
|
|
scored: false
|
|
|
|
- id: 4.2.3
|
|
text: "Ensure that the --client-ca-file argument is set as appropriate (Automated)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host grep clientCAFile /etc/kubernetes/kubelet.conf
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "clientCAFile"
|
|
compare:
|
|
op: eq
|
|
value: "/etc/kubernetes/kubelet-ca.crt"
|
|
remediation: |
|
|
None required. Changing the clientCAFile value is unsupported.
|
|
scored: true
|
|
|
|
- id: 4.2.4
|
|
text: "Verify that the read only port is not used or is set to 0 (Automated)"
|
|
audit: |
|
|
echo `oc -n openshift-kube-apiserver get cm kube-apiserver-pod -o yaml | grep --color read-only-port` 2> /dev/null
|
|
echo `oc -n openshift-kube-apiserver get cm config -o yaml | grep --color "read-only-port"` 2> /dev/null
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: "read-only-port"
|
|
compare:
|
|
op: has
|
|
value: "[\"0\"]"
|
|
- flag: "read-only-port"
|
|
set: false
|
|
remediation: |
|
|
In earlier versions of OpenShift 4, the read-only-port argument is not used.
|
|
Follow the instructions in the documentation to create a Kubelet config CRD
|
|
and set the --read-only-port is set to 0.
|
|
scored: true
|
|
|
|
- id: 4.2.5
|
|
text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Automated)"
|
|
audit: |
|
|
# Should return 1 for each node
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host ps -ef | grep kubelet | grep streaming-connection-idle-timeout
|
|
echo exit_code=$?
|
|
done 2>/dev/null
|
|
# Should return 1 for each node
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host grep streamingConnectionIdleTimeout /etc/kubernetes/kubelet.conf
|
|
echo exit_code=$?
|
|
done 2>/dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: --streaming-connection-idle-timeout
|
|
compare:
|
|
op: noteq
|
|
value: 0
|
|
- flag: "exit_code"
|
|
compare:
|
|
op: eq
|
|
value: 1
|
|
remediation: |
|
|
Follow the instructions in the documentation to create a Kubelet config CRD and set
|
|
the --streaming-connection-idle-timeout to the desired value. Do not set the value to 0.
|
|
scored: true
|
|
|
|
- id: 4.2.6
|
|
text: "Ensure that the --protect-kernel-defaults argument is not set (Manual)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}');
|
|
do
|
|
oc debug node/${node} -- chroot /host more /etc/kubernetes/kubelet.conf;
|
|
done
|
|
tests:
|
|
test_items:
|
|
- flag: protectKernelDefaults
|
|
set: false
|
|
remediation: |
|
|
None required. The OpenShift 4 kubelet modifies the system tunable;
|
|
using the protect-kernel-defaults flag will cause the kubelet to fail on start if the tunables
|
|
don't match the kubelet configuration and the OpenShift node will fail to start.
|
|
scored: false
|
|
|
|
- id: 4.2.7
|
|
text: "Ensure that the --make-iptables-util-chains argument is set to true (Manual)"
|
|
audit: |
|
|
/bin/bash
|
|
flag=make-iptables-util-chains
|
|
opt=makeIPTablesUtilChains
|
|
# look at each machineconfigpool
|
|
while read -r pool nodeconfig; do
|
|
# true by default
|
|
value='true'
|
|
# first look for the flag
|
|
oc get machineconfig $nodeconfig -o json | jq -r '.spec.config.systemd[][] | select(.name=="kubelet.service") | .contents' | sed -n "/^ExecStart=/,/^\$/ { /^\\s*--$flag=false/ q 100 }"
|
|
# if the above command exited with 100, the flag was false
|
|
[ $? == 100 ] && value='false'
|
|
# now look in the yaml KubeletConfig
|
|
yamlconfig=$(oc get machineconfig $nodeconfig -o json | jq -r '.spec.config.storage.files[] | select(.path=="/etc/kubernetes/kubelet.conf") | .contents.source ' | sed 's/^data:,//' | while read; do echo -e ${REPLY//%/\\x}; done)
|
|
echo "$yamlconfig" | sed -n "/^$opt:\\s*false\\s*$/ q 100"
|
|
[ $? == 100 ] && value='false'
|
|
echo "Pool $pool has $flag ($opt) set to $value"
|
|
done < <(oc get machineconfigpools -o json | jq -r '.items[] | select(.status.machineCount>0) | .metadata.name + " " + .spec.configuration.name')
|
|
use_multiple_values: true
|
|
tests:
|
|
test_items:
|
|
- flag: "set to true"
|
|
remediation: |
|
|
None required. The --make-iptables-util-chains argument is set to true by default.
|
|
scored: false
|
|
|
|
- id: 4.2.8
|
|
text: "Ensure that the --hostname-override argument is not set (Manual)"
|
|
audit: |
|
|
echo `oc get machineconfig 01-worker-kubelet -o yaml | grep hostname-override`
|
|
echo `oc get machineconfig 01-master-kubelet -o yaml | grep hostname-override`
|
|
tests:
|
|
test_items:
|
|
- flag: hostname-override
|
|
set: false
|
|
remediation: |
|
|
By default, --hostname-override argument is not set.
|
|
scored: false
|
|
|
|
- id: 4.2.9
|
|
text: "Ensure that the kubeAPIQPS [--event-qps] argument is set to 0 or a level which ensures appropriate event capture (Manual)"
|
|
audit: |
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}');
|
|
do
|
|
oc debug node/${node} -- chroot /host more /etc/kubernetes/kubelet.conf;
|
|
done
|
|
oc get machineconfig 01-worker-kubelet -o yaml | grep --color kubeAPIQPS%3A%2050
|
|
oc get machineconfig 01-master-kubelet -o yaml | grep --color kubeAPIQPS%3A%2050
|
|
type: "manual"
|
|
remediation: |
|
|
Follow the documentation to edit kubelet parameters
|
|
https://docs.openshift.com/container-platform/4.5/scalability_and_performance/recommended-host-practices.html#create-a-kubeletconfig-crd-to-edit-kubelet-parameters
|
|
KubeAPIQPS: <QPS>
|
|
scored: false
|
|
|
|
- id: 4.2.10
|
|
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Automated)"
|
|
audit: |
|
|
oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.kubeletClientInfo'
|
|
tests:
|
|
bin_op: and
|
|
test_items:
|
|
- flag: "/etc/kubernetes/static-pod-certs/secrets/kubelet-client/tls.crt"
|
|
- flag: "/etc/kubernetes/static-pod-certs/secrets/kubelet-client/tls.key"
|
|
remediation: |
|
|
OpenShift automatically manages TLS authentication for the API server communication with the node/kublet.
|
|
This is not configurable.
|
|
scored: true
|
|
|
|
- id: 4.2.11
|
|
text: "Ensure that the --rotate-certificates argument is not set to false (Manual)"
|
|
audit: |
|
|
#Verify the rotateKubeletClientCertificate feature gate is not set to false
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot /host cat /etc/kubernetes/kubelet.conf | grep RotateKubeletClientCertificate
|
|
done 2> /dev/null
|
|
# Verify the rotateCertificates argument is set to true
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot host grep rotate /etc/kubernetes/kubelet.conf;
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: rotateCertificates
|
|
compare:
|
|
op: eq
|
|
value: true
|
|
- flag: rotateKubeletClientCertificates
|
|
compare:
|
|
op: noteq
|
|
value: false
|
|
- flag: rotateKubeletClientCertificates
|
|
set: false
|
|
remediation: |
|
|
None required.
|
|
scored: false
|
|
|
|
- id: 4.2.12
|
|
text: "Verify that the RotateKubeletServerCertificate argument is set to true (Manual)"
|
|
audit: |
|
|
#Verify the rotateKubeletServerCertificate feature gate is on
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}');
|
|
do
|
|
oc debug node/${node} -- chroot /host grep RotateKubeletServerCertificate /etc/kubernetes/kubelet.conf;
|
|
done 2> /dev/null
|
|
# Verify the rotateCertificates argument is set to true
|
|
for node in $(oc get nodes -o jsonpath='{.items[*].metadata.name}')
|
|
do
|
|
oc debug node/${node} -- chroot host grep rotate /etc/kubernetes/kubelet.conf;
|
|
done 2> /dev/null
|
|
use_multiple_values: true
|
|
tests:
|
|
bin_op: or
|
|
test_items:
|
|
- flag: RotateKubeletServerCertificate
|
|
compare:
|
|
op: eq
|
|
value: true
|
|
- flag: rotateCertificates
|
|
compare:
|
|
op: eq
|
|
value: true
|
|
remediation: |
|
|
By default, kubelet server certificate rotation is disabled.
|
|
scored: false
|
|
|
|
- id: 4.2.13
|
|
text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Manual)"
|
|
audit: |
|
|
# needs verification
|
|
# verify cipher suites
|
|
oc describe --namespace=openshift-ingress-operator ingresscontroller/default
|
|
oc get kubeapiservers.operator.openshift.io cluster -o json |jq .spec.observedConfig.servingInfo
|
|
oc get openshiftapiservers.operator.openshift.io cluster -o json |jq .spec.observedConfig.servingInfo
|
|
oc get cm -n openshift-authentication v4-0-config-system-cliconfig -o jsonpath='{.data.v4\-0\-config\-system\-cliconfig}' | jq .servingInfo
|
|
#check value for tlsSecurityProfile; null is returned if default is used
|
|
oc get kubeapiservers.operator.openshift.io cluster -o json |jq .spec.tlsSecurityProfile
|
|
type: manual
|
|
remediation: |
|
|
Follow the directions above and in the OpenShift documentation to configure the tlsSecurityProfile.
|
|
Configuring Ingress
|
|
scored: false
|