sysctls.yaml

# Copyright 2024 Google LLC
#
# This is “Software” that is licensed under the “General Software” section of
# the Service Specific Terms (https://cloud.google.com/terms/service-terms) for
# usage in accordance with the following “Scope of Use”: This file may only be
# used on an Anthos cluster, including any associated ci/cd use. “Anthos
# cluster” is defined as “A Cluster (of any kind) registered to a fleet project
# where the Anthos API is enabled”.
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sPSPForbiddenSysctls
metadata:
  name: nist-sp-800-190-sysctls
  labels:
    policycontroller.gke.io/bundleName: nist-sp-800-190
  annotations:
    policycontroller.gke.io/bundleVersion: "202403.0"
    policycontroller.gke.io/constraintData: |-
      "{
        bundleName: 'nist-sp-800-190',
        bundleDisplayName: 'NIST SP 800-190',
        bundleLink: 'https://cloud.google.com/anthos-config-management/docs/how-to/using-nist-sp-800-190',
        bundleVersion: '202403.0',
        bundleDescription: 'Use the NIST SP 800-190 policy bundle with Policy Controller to evaluate the compliance of your cluster resources against some aspects of the NIST SP 800-190 Appendix B controls.',
        controlNumbers: '[CM-3,CM-7]',
        severity: 'UNSPECIFIED',
        description: 'Sysctls can disable security mechanisms or affect all containers on a host, and are restricted except for an allowed "safe" subset. A sysctl is safe if it is namespaced in the container or the Pod, and it is isolated from other Pods or processes on the same Node. https://kubernetes.io/docs/concepts/security/pod-security-standards/#baseline',
        remediation: 'Containers can set only sysctls listed in the `allowedSysctls` field. Drop any unlisted sysctls from your containers: https://kubernetes.io/docs/tasks/administer-cluster/sysctl-cluster/',
        minimumTemplateLibraryVersion: '1.14.1',
        constraintHash: '26ed42ef11d98ca6e7cdfc3604f884510242d70039b1e71a66b3ec55f7fc44c6'
      }"
spec:
  enforcementAction: dryrun
  match:
    kinds:
      - apiGroups:
          - ""
        kinds:
          - Pod
  parameters:
    allowedSysctls:
      - kernel.shm_rmid_forced
      - net.ipv4.ip_local_port_range
      - net.ipv4.ip_unprivileged_port_start
      - net.ipv4.tcp_syncookies
      - net.ipv4.ping_group_range