Missing AppArmor config

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Metadata

Id: terraform-kubernetes-missing-app-armor-config

Provider: Kubernetes

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Containers should be configured with AppArmor for each application to reduce its potential attack surface. Pods must include the AppArmor annotation container.apparmor.security.beta.kubernetes.io/<container-name> set to an appropriate profile so the kernel enforces confinement. Proper AppArmor profiles limit privileges and reduce the risk of privilege escalation and other compromises.

Compliant Code Examples

resource "kubernetes_pod" "test" {
  metadata {
    name = "terraform-example"
    annotations = {
      "container.apparmor.security.beta.kubernetes.io/example" = "localhost/k8s-apparmor-example-allow-write"
      "prometheus.io/scrape"                                   = "true"
    }
  }

  spec {
    container {
      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

Non-Compliant Code Examples

resource "kubernetes_pod" "example1" {
  metadata {
    name = "terraform-example1"
    annotations = {
      "container.apparmor" = "localhost"
    }
  }

  spec {
    container {
      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

resource "kubernetes_pod" "example2" {
  metadata {
    name = "terraform-example2"
  }

  spec {
    container {
      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}

resource "kubernetes_pod" "example3" {
  metadata {
    name = "terraform-example3"
    annotations = {
      "container.apparmor.security.beta.kubernetes.io/app" = "localhost/k8s-apparmor-example-allow-write"
    }
  }

  spec {
    container {
      image = "nginx:1.7.9"
      name  = "app"
    }

    container {
      image = "nginx:1.7.9"
      name  = "sidecar"
    }
  }
}