mirror of
https://github.com/aquasecurity/kube-bench.git
synced 2024-12-12 01:38:14 +00:00
419 lines
18 KiB
YAML
419 lines
18 KiB
YAML
---
|
|
controls:
|
|
version: "tkgi-1.2.53"
|
|
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"
|
|
audit: stat -c permissions=%a /var/vcap/jobs/kubelet/monit
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example,
|
|
chmod 644 /var/vcap/jobs/kubelet/monit
|
|
scored: true
|
|
|
|
- id: 4.1.2
|
|
text: "Ensure that the kubelet service file ownership is set to root:root"
|
|
audit: stat -c %U:%G /var/vcap/jobs/kubelet/monit
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example,
|
|
chown root:root /var/vcap/jobs/kubelet/monit
|
|
Exception
|
|
File is group owned by vcap
|
|
scored: true
|
|
|
|
- id: 4.1.3
|
|
text: "Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive"
|
|
audit: stat -c permissions=%a /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example,
|
|
chmod 644 /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
scored: true
|
|
|
|
- id: 4.1.4
|
|
text: "Ensure that the proxy kubeconfig file ownership is set to root:root"
|
|
audit: stat -c %U:%G /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example, chown root:root /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
Exception
|
|
File is group owned by vcap
|
|
scored: false
|
|
|
|
- id: 4.1.5
|
|
text: "Ensure that the kubelet.conf file permissions are set to 644 or more restrictive"
|
|
audit: stat -c permissions=%a /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example,
|
|
chmod 644 /var/vcap/jobs/kube-proxy/config/kubeconfig
|
|
Exception
|
|
kubeadm is not used to provision/bootstrap the cluster. kubeadm and associated config files do not exist on worker
|
|
scored: false
|
|
|
|
- id: 4.1.6
|
|
text: "Ensure that the kubelet.conf file ownership is set to root:root"
|
|
audit: stat -c %U:%G /etc/kubernetes/kubelet.conf
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
Run the below command (based on the file location on your system) on the each worker node.
|
|
For example,
|
|
chown root:root /etc/kubernetes/kubelet.conf
|
|
Exception
|
|
file ownership is vcap:vcap
|
|
scored: false
|
|
|
|
- id: 4.1.7
|
|
text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive"
|
|
audit: stat -c permissions=%a /var/vcap/jobs/kubelet/config/kubelet-client-ca.pem
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
Run the following command to modify the file permissions of the
|
|
--client-ca-file chmod 644 <filename>
|
|
scored: true
|
|
|
|
- id: 4.1.8
|
|
text: "Ensure that the client certificate authorities file ownership is set to root:root"
|
|
audit: stat -c %U:%G /var/vcap/jobs/kubelet/config/kubelet-client-ca.pem
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
compare:
|
|
op: eq
|
|
value: root:root
|
|
remediation: |
|
|
Run the following command to modify the ownership of the --client-ca-file.
|
|
chown root:root <filename>
|
|
Exception
|
|
File is group owned by vcap
|
|
scored: false
|
|
|
|
- id: 4.1.9
|
|
text: "Ensure that the kubelet --config configuration file has permissions set to 644 or more restrictive"
|
|
audit: stat -c permissions=%a /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "permissions"
|
|
compare:
|
|
op: bitmask
|
|
value: "644"
|
|
remediation: |
|
|
Run the following command (using the config file location identified in the Audit step)
|
|
chmod 644 /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
scored: true
|
|
|
|
- id: 4.1.10
|
|
text: "Ensure that the kubelet --config configuration file ownership is set to root:root"
|
|
audit: stat -c %U:%G /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: root:root
|
|
remediation: |
|
|
Run the following command (using the config file location identified in the Audit step)
|
|
chown root:root /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
Exception
|
|
File is group owned by vcap
|
|
scored: false
|
|
|
|
- id: 4.2
|
|
text: "Kubelet"
|
|
checks:
|
|
- id: 4.2.1
|
|
text: "Ensure that the anonymous-auth argument is set to false"
|
|
audit: grep "^authentication:\n\s{2}anonymous:\n\s{4}enabled:\sfalse$" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "enabled: false"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to
|
|
false.
|
|
If using executable arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
|
|
--anonymous-auth=false
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.2
|
|
text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow"
|
|
audit: |
|
|
grep "^authorization:\n\s{2}mode: AlwaysAllow$" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "AlwaysAllow"
|
|
set: false
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set authorization: mode to Webhook. If
|
|
using executable arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_AUTHZ_ARGS variable.
|
|
--authorization-mode=Webhook
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.3
|
|
text: "Ensure that the --client-ca-file argument is set as appropriate"
|
|
audit: |
|
|
grep ^authentication:\n\s{2}anonymous:\n\s{4}enabled:\sfalse\n(\s{2}webhook:\n\s{4}cacheTTL:\s\d+s\n\s{4}enabled:.*\n)?
|
|
\s{2}x509:\n\s{4}clientCAFile:\s"\/var\/vcap\/jobs\/kubelet\/config\/kubelet-client-ca\.pem" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "clientCAFile"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set authentication: x509: clientCAFile to
|
|
the location of the client CA file.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_AUTHZ_ARGS variable.
|
|
--client-ca-file=<path/to/client-ca-file>
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.4
|
|
text: "Ensure that the --read-only-port argument is set to 0"
|
|
audit: |
|
|
grep "readOnlyPort: 0" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "readOnlyPort: 0"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set readOnlyPort to 0.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
|
|
--read-only-port=0
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.5
|
|
text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0"
|
|
audit: |
|
|
grep -- "streamingConnectionIdleTimeout: 0" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "streamingConnectionIdleTimeout: 0"
|
|
set: false
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set streamingConnectionIdleTimeout to a
|
|
value other than 0.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
|
|
--streaming-connection-idle-timeout=5m
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.6
|
|
text: "Ensure that the --protect-kernel-defaults argument is set to true"
|
|
audit: |
|
|
grep -- "protectKernelDefaults: true" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "protectKernelDefaults: true"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set protectKernelDefaults: true.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
|
|
--protect-kernel-defaults=true
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.7
|
|
text: "Ensure that the --make-iptables-util-chains argument is set to true"
|
|
audit: |
|
|
grep -- "makeIPTablesUtilChains: true" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
test_items:
|
|
- flag: "makeIPTablesUtilChains: true"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set makeIPTablesUtilChains: true.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
remove the --make-iptables-util-chains argument from the
|
|
KUBELET_SYSTEM_PODS_ARGS variable.
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.8
|
|
text: "Ensure that the --hostname-override argument is not set"
|
|
audit: |
|
|
ps -ef | grep [k]ubelet | grep -- --[c]onfig=/var/vcap/jobs/kubelet/config/kubeletconfig.yml | grep -v -- --hostname-override
|
|
type: manual
|
|
remediation: |
|
|
Edit the kubelet service file
|
|
on each worker node and remove the --hostname-override argument from the
|
|
KUBELET_SYSTEM_PODS_ARGS variable.
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
Exception
|
|
On GCE, the hostname needs to be set to the instance name so the gce cloud provider can manage the instance.
|
|
In other cases its set to the IP address of the VM.
|
|
scored: false
|
|
|
|
- id: 4.2.9
|
|
text: "Ensure that the --event-qps argument is set to 0 or a level which ensures appropriate event capture"
|
|
audit: grep -- "--event-qps" /var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: "--event-qps"
|
|
compare:
|
|
op: eq
|
|
value: 0
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set eventRecordQPS: to an appropriate level.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: false
|
|
|
|
- id: 4.2.10
|
|
text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate"
|
|
audit: |
|
|
grep ^tlsCertFile:\s\"\/var\/vcap\/jobs\/kubelet\/config\/kubelet\.pem\"\ntlsPrivateKeyFile:\s\"\/var\/vcap\/jobs\/kubelet\/config\/kubelet-key\.pem\"$
|
|
/var/vcap/jobs/kubelet/config/kubeletconfig.yml
|
|
tests:
|
|
bin_op: and
|
|
test_items:
|
|
- flag: "tlsCertFile"
|
|
- flag: "tlsPrivateKeyFile"
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set tlsCertFile to the location
|
|
of the certificate file to use to identify this Kubelet, and tlsPrivateKeyFile
|
|
to the location of the corresponding private key file.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the below parameters in KUBELET_CERTIFICATE_ARGS variable.
|
|
--tls-cert-file=<path/to/tls-certificate-file>
|
|
--tls-private-key-file=<path/to/tls-key-file>
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: true
|
|
|
|
- id: 4.2.11
|
|
text: "Ensure that the --rotate-certificates argument is not set to false"
|
|
audit: ps -ef | grep kubele[t] | grep -- "--rotate-certificates=false"
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: "--rotate-certificates=false"
|
|
set: false
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to add the line rotateCertificates: true or
|
|
remove it altogether to use the default value.
|
|
If using command line arguments, edit the kubelet service file
|
|
on each worker node and
|
|
remove --rotate-certificates=false argument from the KUBELET_CERTIFICATE_ARGS
|
|
variable.
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
Exception
|
|
Certificate rotation is handled by Credhub
|
|
scored: false
|
|
|
|
- id: 4.2.12
|
|
text: "Verify that the RotateKubeletServerCertificate argument is set to true"
|
|
audit: ps -ef | grep kubele[t] | grep -- "--feature-gates=\(\w\+\|,\)*RotateKubeletServerCertificate=true\(\w\+\|,\)*"
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: "RotateKubeletServerCertificate=true"
|
|
remediation: |
|
|
Edit the kubelet service file
|
|
on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable.
|
|
--feature-gates=RotateKubeletServerCertificate=true
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
Exception
|
|
Certificate rotation is handled by Credhub
|
|
scored: false
|
|
|
|
- id: 4.2.13
|
|
text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers"
|
|
audit: ps -ef | grep kubele[t] | grep -- "--tls-cipher-
|
|
suites=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384"
|
|
type: manual
|
|
tests:
|
|
test_items:
|
|
- flag: --tls-cipher-suites
|
|
compare:
|
|
op: regex
|
|
value: (TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256|TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256|TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305|TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384|TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305|TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384|TLS_RSA_WITH_AES_256_GCM_SHA384|TLS_RSA_WITH_AES_128_GCM_SHA256)
|
|
remediation: |
|
|
If using a Kubelet config file, edit the file to set tlsCipherSuites: to
|
|
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
|
|
or to a subset of these values.
|
|
If using executable arguments, edit the kubelet service file
|
|
on each worker node and
|
|
set the --tls-cipher-suites parameter as follows, or to a subset of these values.
|
|
--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256
|
|
Based on your system, restart the kubelet service. For example:
|
|
systemctl daemon-reload
|
|
systemctl restart kubelet.service
|
|
scored: false
|