Add k3s-cis-1.11 benchmark configuration

cfg/config.yaml

@@ -310,6 +310,7 @@ version_mapping:
   "k3s-cis-1.7": "k3s-cis-1.7"
   "k3s-cis-1.23": "k3s-cis-1.23"
   "k3s-cis-1.24": "k3s-cis-1.24"
+  "k3s-cis-1.11": "k3s-cis-1.11"
   "rke-cis-1.7": "rke-cis-1.7"
   "rke-cis-1.23": "rke-cis-1.23"
   "rke-cis-1.24": "rke-cis-1.24"
@@ -520,6 +521,12 @@ target_mapping:
     - "controlplane"
     - "node"
     - "policies"
+  "k3s-cis-1.11":
+    - "master"
+    - "etcd"
+    - "controlplane"
+    - "node"
+    - "policies"
   "rke-cis-1.7":
     - "master"
     - "etcd"

cfg/k3s-cis-1.11/config.yaml

@@ -0,0 +1,54 @@
+---
+## Version-specific settings that override the values in cfg/config.yaml
+
+master:
+  components:
+    - apiserver
+    - kubelet
+    - scheduler
+    - controllermanager
+    - etcd
+    - policies
+  apiserver:
+    bins:
+      - containerd
+  kubelet:
+    bins:
+      - containerd
+    defaultkubeconfig: /var/lib/rancher/k3s/agent/kubelet.kubeconfig
+    defaultcafile: /var/lib/rancher/k3s/agent/client-ca.crt
+  scheduler:
+    bins:
+      - containerd
+    kubeconfig:
+      - /var/lib/rancher/k3s/server/cred/scheduler.kubeconfig
+  controllermanager:
+    bins:
+      - containerd
+    kubeconfig:
+      - /var/lib/rancher/k3s/server/cred/controller.kubeconfig
+  etcd:
+    bins:
+      - containerd
+
+etcd:
+  confs: /var/lib/rancher/k3s/server/db/etcd/config
+
+node:
+  components:
+    - kubelet
+    - proxy
+  kubelet:
+    bins:
+      - containerd
+    confs:
+      - /var/lib/rancher/k3s/agent/kubelet.kubeconfig
+    defaultkubeconfig: /var/lib/rancher/k3s/agent/kubelet.kubeconfig
+    defaultcafile: /var/lib/rancher/k3s/agent/client-ca.crt
+  proxy:
+    bins:
+      - containerd
+    defaultkubeconfig: /var/lib/rancher/k3s/agent/kubeproxy.kubeconfig
+policies:
+  components:
+    - policies

cfg/k3s-cis-1.11/controlplane.yaml

@@ -0,0 +1,46 @@
+---
+controls:
+version: "k3s-cis-1.11"
+id: 3
+text: "Control Plane Configuration"
+type: "controlplane"
+groups:
+  - id: 3.1
+    text: "Authentication and Authorization"
+    checks:
+      - id: 3.1.1
+        text: "Client certificate authentication should not be used for users (Manual)"
+        type: "manual"
+        remediation: |
+          Alternative mechanisms provided by Kubernetes such as the use of OIDC should be
+          implemented in place of client certificates.
+        scored: false
+
+  - id: 3.2
+    text: "Logging"
+    checks:
+      - id: 3.2.1
+        text: "Ensure that a minimal audit policy is created (Automated)"
+        audit: "journalctl -m -u k3s | grep 'Running kube-apiserver' | tail -n1 | grep 'audit-policy-file'"
+        tests:
+          test_items:
+            - flag: "--audit-policy-file"
+              set: true
+        remediation: |
+          Create an audit policy file for your cluster.
+        scored: false
+
+      - id: 3.2.2
+        text: "Ensure that the audit policy covers key security concerns (Manual)"
+        type: "manual"
+        remediation: |
+          Review the audit policy provided for the cluster and ensure that it covers
+          at least the following areas,
+          - Access to Secrets managed by the cluster. Care should be taken to only
+            log Metadata for requests to Secrets, ConfigMaps, and TokenReviews, in
+            order to avoid risk of logging sensitive data.
+          - Modification of Pod and Deployment objects.
+          - Use of `pods/exec`, `pods/portforward`, `pods/proxy` and `services/proxy`.
+          For most requests, minimally logging at the Metadata level is recommended
+          (the most basic level of logging).
+        scored: false

cfg/k3s-cis-1.11/etcd.yaml

@@ -0,0 +1,144 @@
+---
+controls:
+version: "k3s-cis-1.11"
+id: 2
+text: "Etcd Node Configuration"
+type: "etcd"
+groups:
+  - id: 2
+    text: "Etcd Node Configuration"
+    checks:
+      - id: 2.1
+        text: "Ensure that the --cert-file and --key-file arguments are set as appropriate (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          bin_op: and
+          test_items:
+            - path: "{.client-transport-security.cert-file}"
+              compare:
+                op: eq
+                value: "/var/lib/rancher/k3s/server/tls/etcd/server-client.crt"
+            - path: "{.client-transport-security.key-file}"
+              compare:
+                op: eq
+                value: "/var/lib/rancher/k3s/server/tls/etcd/server-client.key"
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s generates cert and key files for etcd.
+          These are located in /var/lib/rancher/k3s/server/tls/etcd/.
+          If this check fails, ensure that the configuration file /var/lib/rancher/k3s/server/db/etcd/config
+          has not been modified to use custom cert and key files.
+        scored: false
+
+      - id: 2.2
+        text: "Ensure that the --client-cert-auth argument is set to true (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          test_items:
+            - path: "{.client-transport-security.client-cert-auth}"
+              compare:
+                op: eq
+                value: true
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s sets the --client-cert-auth parameter to true.
+          If this check fails, ensure that the configuration file /var/lib/rancher/k3s/server/db/etcd/config
+          has not been modified to disable client certificate authentication.
+        scored: false
+
+      - id: 2.3
+        text: "Ensure that the --auto-tls argument is not set to true (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          bin_op: or
+          test_items:
+            - path: "{.client-transport-security.auto-tls}"
+              compare:
+                op: eq
+                value: false
+            - path: "{.client-transport-security.auto-tls}"
+              set: false
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s does not set the --auto-tls parameter.
+          If this check fails, edit the etcd pod specification file /var/lib/rancher/k3s/server/db/etcd/config on the master
+          node and either remove the --auto-tls parameter or set it to false.
+          client-transport-security:
+            auto-tls: false
+        scored: false
+
+      - id: 2.4
+        text: "Ensure that the --peer-cert-file and --peer-key-file arguments are set as appropriate (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          bin_op: and
+          test_items:
+            - path: "{.peer-transport-security.cert-file}"
+              compare:
+                op: eq
+                value: "/var/lib/rancher/k3s/server/tls/etcd/peer-server-client.crt"
+            - path: "{.peer-transport-security.key-file}"
+              compare:
+                op: eq
+                value: "/var/lib/rancher/k3s/server/tls/etcd/peer-server-client.key"
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s generates peer cert and key files for etcd.
+          These are located in /var/lib/rancher/k3s/server/tls/etcd/.
+          If this check fails, ensure that the configuration file /var/lib/rancher/k3s/server/db/etcd/config
+          has not been modified to use custom peer cert and key files.
+        scored: false
+
+      - id: 2.5
+        text: "Ensure that the --peer-client-cert-auth argument is set to true (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          test_items:
+            - path: "{.peer-transport-security.client-cert-auth}"
+              compare:
+                op: eq
+                value: true
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s sets the --peer-cert-auth parameter to true.
+          If this check fails, ensure that the configuration file /var/lib/rancher/k3s/server/db/etcd/config
+          has not been modified to disable peer client certificate authentication.
+        scored: false
+
+      - id: 2.6
+        text: "Ensure that the --peer-auto-tls argument is not set to true (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          bin_op: or
+          test_items:
+            - path: "{.peer-transport-security.auto-tls}"
+              compare:
+                op: eq
+                value: false
+            - path: "{.peer-transport-security.auto-tls}"
+              set: false
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s does not set the --peer-auto-tls parameter.
+          If this check fails, edit the etcd pod specification file /var/lib/rancher/k3s/server/db/etcd/config on the master
+          node and either remove the --peer-auto-tls parameter or set it to false.
+          peer-transport-security:
+            auto-tls: false
+        scored: false
+
+      - id: 2.7
+        text: "Ensure that a unique Certificate Authority is used for etcd (Manual)"
+        audit_config: "cat $etcdconf"
+        tests:
+          test_items:
+            - path: "{.peer-transport-security.trusted-ca-file}"
+              compare:
+                op: eq
+                value: "/var/lib/rancher/k3s/server/tls/etcd/peer-ca.crt"
+        remediation: |
+          If running on with sqlite or a external DB, etcd checks are Not Applicable.
+          When running with embedded-etcd, K3s generates a unique certificate authority for etcd.
+          This is located at /var/lib/rancher/k3s/server/tls/etcd/peer-ca.crt.
+          If this check fails, ensure that the configuration file /var/lib/rancher/k3s/server/db/etcd/config
+          has not been modified to use a shared certificate authority.
+        scored: false