kube-bench/cfg/cis-1.6-k3s/etcd.yaml

---
controls:
version: "cis-1.6-k3s"
id: 2
text: "Etcd Node Configuration"
type: "etcd"
groups:
  - id: 2
    text: "Etcd Node Configuration Files"
    checks:
      - id: 2.1
        text: "Ensure that the --cert-file and --key-file arguments are set as appropriate if use etcd as database (Automated)"
        audit: grep -A 4 'client-transport-security' $etcdconf | grep -E 'cert-file|key-file'
        tests:
          bin_op: and
          test_items:
            - flag: "cert-file"
            - flag: "key-file"
        remediation: |
          By default, K3s uses a config file for etcd that can be found at $etcdconf.
          The config file contains client-transport-security: which has fields that have the peer cert and peer key files. No manual remediation needed.          
        scored: true

      - id: 2.2
        text: "Ensure that the --client-cert-auth argument is set to true (Automated)"
        audit: grep 'client-cert-auth' $etcdconf
        tests:
          test_items:
            - flag: "client-cert-auth"
              compare:
                op: eq
                value: true
        remediation: |
          By default, K3s uses a config file for etcd that can be found at $etcdconf.
          client-cert-auth is set to true. No manual remediation needed.          
        scored: true

      - id: 2.3
        text: "Ensure that the --auto-tls argument is not set to true (Automated)"
        audit: grep 'auto-tls' $etcdconf | cat
        tests:
          bin_op: or
          test_items:
            - flag: "auto-tls"
              set: false
            - flag: "auto-tls"
              compare:
                op: eq
                value: false
        remediation: |
          By default, K3s starts Etcd without this flag. It is set to false by default.          
        scored: true

      - id: 2.4
        text: "Ensure that the --peer-cert-file and --peer-key-file arguments are
        set as appropriate (Automated)"
        audit: grep -A 4 'peer-transport-security' $etcdconf | grep -E 'cert-file|key-file'
        tests:
          bin_op: and
          test_items:
            - flag: "cert-file"
            - flag: "key-file"
        remediation: |
          By default, K3s starts Etcd with a config file found here, $etcdconf.
          The config file contains peer-transport-security: which has fields that have the peer cert and peer key files.          
        scored: true

      - id: 2.5
        text: "Ensure that the --peer-client-cert-auth argument is set to true (Automated)"
        audit: grep -A 4 'peer-transport-security' $etcdconf | grep 'client-cert-auth'
        tests:
          test_items:
            - flag: "client-cert-auth"
              compare:
                op: eq
                value: true
        remediation: |
          By default, K3s uses a config file for etcd that can be found at $etcdconf.
          The config file contains peer-transport-security: which has client-cert-auth set to true. No manual remediation needed.          
        scored: true

      - id: 2.6
        text: "Ensure that the --peer-auto-tls argument is not set to true (Automated)"
        audit: grep 'peer-auto-tls' $etcdconf | cat
        tests:
          bin_op: or
          test_items:
            - flag: "peer-auto-tls"
              set: false
            - flag: "peer-auto-tls"
              compare:
                op: eq
                value: false
        remediation: |
          By default, K3s uses a config file for etcd that can be found at $etcdconf.
          Within the file, it does not contain the peer-auto-tls field. No manual remediation needed.          
        scored: true

      - id: 2.7
        text: "Ensure that a unique Certificate Authority is used for etcd (Manual)"
        audit: |
          if [ -f "$etcdconf" ];then
            etcd_ca=$(grep 'trusted-ca-file' $etcdconf | awk -F ":|: *" '{print $NF}');
            apiserver_ca=$(journalctl -u k3s | grep "Running kube-apiserver" | tail -n1 | grep "trusted-ca-file" | awk -F "=" '{print $NF}')
            if [ "$etcd_ca" == "$apiserver_ca" ]; then
              echo 'etcd_and_apiserver_have_same_ca';
            else
              echo 'etcd_and_apiserver_ca_not_same1' ;
            fi
          else
            echo 'etcd_and_apiserver_ca_not_same'; return ;
          fi          
        tests:
          test_items:
            - flag: "etcd_and_apiserver_ca_not_same"
        remediation: |
          By default, K3s uses a config file for etcd that can be found at $etcdconf
          and the trusted-ca-file parameters in it are set to unique values specific to etcd. No manual remediation needed.          
        scored: false