M-107_selinux.yml

# Copyright 2023 Undistro Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
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# https://kubernetes.io/docs/concepts/security/pod-security-standards/#baseline
# https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/pod-security-admission/policy/check_seLinuxOptions.go
# https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/pod-security-admission/policy/check_seLinuxOptions_test.go
id: M-107
slug: selinux
severity: Medium
message: "Forbidden SELinux options"
match:
  resources:
    - group: ""
      version: v1
      resource: pods
    - group: apps
      version: v1
      resource: deployments
    - group: apps
      version: v1
      resource: daemonsets
    - group: apps
      version: v1
      resource: statefulsets
    - group: apps
      version: v1
      resource: replicasets
    - group: batch
      version: v1
      resource: cronjobs
    - group: batch
      version: v1
      resource: jobs
params:
  allowedSELinuxTypes:
    - container_t
    - container_init_t
    - container_kvm_t
    - ""
validations:
  - expression: >
      podSpec.?securityContext.?seLinuxOptions.?type.orValue("") in params.allowedSELinuxTypes
    message: "Pod with not allowed SELinux type"
  - expression: >
      allContainers.all(c, c.?securityContext.?seLinuxOptions.?type.orValue("") in params.allowedSELinuxTypes)
    message: "Container with not allowed SELinux type"
  - expression: >
      podSpec.?securityContext.?seLinuxOptions.?user.orValue("") == ""
    message: "Pod with forbidden SELinux user"
  - expression: >
      allContainers.all(c, c.?securityContext.?seLinuxOptions.?user.orValue("") == "")
    message: "Container with forbidden SELinux user"
  - expression: >
      podSpec.?securityContext.?seLinuxOptions.?role.orValue("") == ""
    message: "Pod with forbidden SELinux role"
  - expression: >
      allContainers.all(c, c.?securityContext.?seLinuxOptions.?role.orValue("") == "")
    message: "Container with forbidden SELinux role"