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Add security settings base on master warn check in kube-bench cis-1.6 #42

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merged 2 commits into from
Jan 3, 2022
Merged

Add security settings base on master warn check in kube-bench cis-1.6 #42

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eabaa38
Add terminatedPodGCThreshold in kubeControllerManager for kube-bench
Dec 23, 2021
e3dfe90
Add tlsCipherSuites setting into kubelet, kubeControllermanager and k…
Dec 30, 2021
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7 changes: 7 additions & 0 deletions defaults/main.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,14 @@ kops_default_kubelet:
anonymousAuth: false
authenticationTokenWebhook: true
authorizationMode: Webhook
tlsCipherSuites:
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
kops_default_kubeControllerManager:
enableProfiling: false
terminatedPodGCThreshold: 12500
tlsCipherSuites:
- TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
- TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
kops_default_kubeScheduler:
enableProfiling: false
43 changes: 43 additions & 0 deletions tasks/asserts.yml
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Expand Up @@ -179,6 +179,20 @@
{{ kops_default_kubelet }}
{%- endif -%}

- name: "({{ cluster.name }}) ensure kops_kubelet.tlsCipherSuites is list(string)"
assert:
that:
- item.tlsCipherSuites is defined
- item.tlsCipherSuites | type_debug == "list"
msg: "kops_kubelet.tlsCipherSuites should be list(string)"
with_items:
- >-
{%- if cluster.kops_kubelet is defined and 'tlsCipherSuites' in cluster.kops_kubelet -%}
{{ cluster.kops_kubelet }}
{%- else -%}
{{ kops_default_kubelet }}
{%- endif -%}

- name: "({{ cluster.name }}) ensure kubeControllerManager.enableProfiling is boolean"
assert:
that:
Expand All @@ -193,6 +207,35 @@
{{ kops_default_kubeControllerManager }}
{%- endif -%}

- name: "({{ cluster.name }}) ensure kube_controller_manager.terminatedPodGCThreshold is larger or equal to 0"
assert:
that:
- item.terminatedPodGCThreshold is defined
- item.terminatedPodGCThreshold >= 0
msg: "kube_controller_manager.terminatedPodGCThreshold should >= 0"
with_items:
- >-
{%- if cluster.kube_controller_manager is defined and
'terminatedPodGCThreshold' in cluster.kube_controller_manager -%}
{{ cluster.kube_controller_manager }}
{%- else -%}
{{ kops_default_kubeControllerManager }}
{%- endif -%}

- name: "({{ cluster.name }}) ensure kube_controller_manager.tlsCipherSuites is list(string)"
assert:
that:
- item.tlsCipherSuites is defined
- item.tlsCipherSuites | type_debug == "list"
msg: "kube_controller_manager.tlsCipherSuites should be list(string)"
with_items:
- >-
{%- if cluster.kube_controller_manager is defined and 'tlsCipherSuites' in cluster.kube_controller_manager -%}
{{ cluster.kube_controller_manager }}
{%- else -%}
{{ kops_default_kubeControllerManager }}
{%- endif -%}

- name: "({{ cluster.name }}) ensure kubeScheduler.enableProfiling is boolean"
assert:
that:
Expand Down
11 changes: 11 additions & 0 deletions templates/cluster.yml.j2
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Expand Up @@ -8,8 +8,19 @@ spec:
anonymousAuth: {{ cluster.kops_kubelet.anonymousAuth | default(kops_default_kubelet.anonymousAuth) }}
authenticationTokenWebhook: {{ cluster.kops_kubelet.authenticationTokenWebhook | default(kops_default_kubelet.authenticationTokenWebhook) }}
authorizationMode: {{ cluster.kops_kubelet.authorizationMode | default(kops_default_kubelet.authorizationMode) }}
{% if 'kops_kubelet' in cluster and 'tlsCipherSuites' in cluster.kops_kubelet %}
tlsCipherSuites:
{{ cluster.kops_kubelet.tlsCipherSuites | to_nice_yaml(indent=2) | indent(width=6, first=True) -}}
{% endif %}
kubeControllerManager:
enableProfiling: {{ cluster.kops_kubeControllerManager.enableProfiling | default(kops_default_kubeControllerManager.enableProfiling) }}
{% if cluster.kube_controller_manager.terminatedPodGCThreshold is defined %}
terminatedPodGCThreshold: {{ cluster.kube_controller_manager.terminatedPodGCThreshold }}
{% endif %}
{% if 'kube_controller_manager' in cluster and 'tlsCipherSuites' in cluster.kube_controller_manager %}
tlsCipherSuites:
{{ cluster.kube_controller_manager.tlsCipherSuites | to_nice_yaml(indent=2) | indent(width=6, first=True) -}}
{% endif %}
kubeScheduler:
enableProfiling: {{ cluster.kops_kubeScheduler.enableProfiling | default(kops_default_kubeScheduler.enableProfiling) }}
api:
Expand Down