Constraint template library

Constraint templates let you define how a constraint works but delegate defining the specifics of the constraint to an individual or group with subject matter expertise. In addition to separating concerns, this also separates the logic of the constraint from its definition.

All constraints contain a match section, which defines the objects a constraint applies to. For details on how to configure that section, see Constraint match section.

Not all constraint templates are available for all versions of Policy Controller and templates can change between versions. Use the following links to compare constraints from supported versions:

Links to supported versions of this page

To ensure that you receive full support, we recommend that you use constraint templates from a supported version of Policy Controller.

To help you see how the constraint templates function, each template includes an example constraint and a resource that violates the constraint.

Available constraint templates

Constraint Template Description Referential
AllowedServicePortName Requires that service port names have a prefix from a specified list. No
AsmAuthzPolicyDefaultDeny Enforce the mesh level default deny AuthorizationPolicy. Reference to https://istio.io/latest/docs/ops/best-practices/security/#use-default-deny-patterns. Yes
AsmAuthzPolicyDisallowedPrefix Requires that principals and namespaces in Istio `AuthorizationPolicy` rules not have a prefix from a specified list. https://istio.io/latest/docs/reference/config/security/authorization-policy/ No
AsmAuthzPolicyEnforceSourcePrincipals Requires that Istio AuthorizationPolicy "from" field, when defined, has source principles, which must be set to something other than "*". https://istio.io/latest/docs/reference/config/security/authorization-policy/ No
AsmAuthzPolicyNormalization Enforce the AuthorizationPolicy normalization. Reference to https://istio.io/latest/docs/reference/config/security/normalization/. No
AsmAuthzPolicySafePattern Enforce the AuthorizationPolicy safe patterns. Reference to https://istio.io/latest/docs/ops/best-practices/security/#safer-authorization-policy-patterns. No
AsmIngressgatewayLabel Enforce the istio ingressgateway label usage only on ingressgateway pods. No
AsmPeerAuthnMeshStrictMtls Enforce the mesh level strict mtls PeerAuthentication. Reference to https://istio.io/latest/docs/ops/best-practices/security/#mutual-tls. Yes
AsmPeerAuthnStrictMtls Enforce all PeerAuthentications cannot overwrite strict mtls. Reference to https://istio.io/latest/docs/ops/best-practices/security/#mutual-tls. No
AsmRequestAuthnProhibitedOutputHeaders In RequestAuthentication, enforce the `jwtRules.outPayloadToHeader` field to not contain well known HTTP request headers or custom prohibited headers. Reference to https://istio.io/latest/docs/reference/config/security/jwt/#JWTRule. No
AsmSidecarInjection Enforce the istio proxy sidecar always been injected to workload pods. No
DestinationRuleTLSEnabled Prohibits disabling TLS for all hosts and host subsets in Istio DestinationRules. No
DisallowedAuthzPrefix Requires that principals and namespaces in Istio `AuthorizationPolicy` rules not have a prefix from a specified list. https://istio.io/latest/docs/reference/config/security/authorization-policy/ No
GCPStorageLocationConstraintV1 Restricts the permitted `locations` for StorageBucket Config Connector resources to the list of locations provided in the constraint. Bucket names in the `exemptions` list are exempt. No
GkeSpotVMTerminationGrace Requires Pods and Pod Templates with `nodeSelector` or `nodeAfffinty` of `gke-spot` to have a `terminationGracePeriodSeconds` of 15s or less. Yes
K8sAllowedRepos Requires container images to begin with a string from the specified list. No
K8sAvoidUseOfSystemMastersGroup Disallows the use of 'system:masters' group. Has no effect during audit. No
K8sBlockAllIngress Disallows the creation of Ingress objects (`Ingress`, `Gateway`, and `Service` types of `NodePort` and `LoadBalancer`). No
K8sBlockCreationWithDefaultServiceAccount Disallows the creation of resources using a default service account. Has no effect during audit. No
K8sBlockEndpointEditDefaultRole Many Kubernetes installations by default have a system:aggregate-to-edit ClusterRole which does not properly restrict access to editing Endpoints. This ConstraintTemplate forbids the system:aggregate-to-edit ClusterRole from granting permission to create/patch/update Endpoints. ClusterRole/system:aggregate-to-edit should not allow Endpoint edit permissions due to CVE-2021-25740, Endpoint & EndpointSlice permissions allow cross-Namespace forwarding, https://github.com/kubernetes/kubernetes/issues/103675 No
K8sBlockLoadBalancer Disallows all Services with type LoadBalancer. https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer No
K8sBlockNodePort Disallows all Services with type NodePort. https://kubernetes.io/docs/concepts/services-networking/service/#nodeport No
K8sBlockObjectsOfType Disallows object of forbidden types. No
K8sBlockProcessNamespaceSharing Prohibits Pod specs with `shareProcessNamespace` set to `true`. This avoids scenarios where all containers in a Pod share a PID namespace and can access each other's filesystem and memory. No
K8sBlockWildcardIngress Users should not be able to create Ingresses with a blank or wildcard (*) hostname since that would enable them to intercept traffic for other services in the cluster, even if they don't have access to those services. No
K8sContainerEphemeralStorageLimit Requires containers to have an ephemeral storage limit set and constrains the limit to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ No
K8sContainerLimits Requires containers to have memory and CPU limits set and constrains limits to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ No
K8sContainerRatios Sets a maximum ratio for container resource limits to requests. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ No
K8sContainerRequests Requires containers to have memory and CPU requests set and constrains requests to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ No
K8sCronJobAllowedRepos Requires container images of CronJobs to begin with a string from the specified list. No
K8sDisallowAnonymous Disallows associating ClusterRole and Role resources to the system:anonymous user and system:unauthenticated group. No
K8sDisallowInteractiveTTY Requires that objects have the fields `spec.tty` and `spec.stdin` set to false or unset. No
K8sDisallowedRepos Disallowed container repositories that begin with a string from the specified list. No
K8sDisallowedRoleBindingSubjects Prohibits RoleBindings or ClusterRoleBindings with subjects matching any `disallowedSubjects` passed as parameters. No
K8sDisallowedTags Requires container images to have an image tag different from the ones in the specified list. https://kubernetes.io/docs/concepts/containers/images/#image-names No
K8sEmptyDirHasSizeLimit Requires that any `emptyDir` volumes specify a `sizeLimit`. Optionally, a `maxSizeLimit` parameter can be supplied in the constraint to specify a maximum allowable size limit. No
K8sEnforceCloudArmorBackendConfig Enforces Cloud Armor configuration on BackendConfig resources No
K8sEnforceConfigManagement Requires the presence and operation of Config Management. Constraints using this `ConstraintTemplate` will be audit only regardless of `enforcementAction` value. Yes
K8sExternalIPs Restricts Service externalIPs to an allowed list of IP addresses. https://kubernetes.io/docs/concepts/services-networking/service/#external-ips No
K8sHorizontalPodAutoscaler Disallow the following scenarios when deploying `HorizontalPodAutoscalers` 1. Deployment of HorizontalPodAutoscalers with `.spec.minReplicas` or `.spec.maxReplicas` outside the ranges defined in the constraint 2. Deployment of HorizontalPodAutoscalers where the difference between `.spec.minReplicas` and `.spec.maxReplicas` is less than the configured `minimumReplicaSpread` 3. Deployment of HorizontalPodAutoscalers that do not reference a valid `scaleTargetRef` (e.g. Deployment, ReplicationController, ReplicaSet, StatefulSet). Yes
K8sHttpsOnly Requires Ingress resources to be HTTPS only. Ingress resources must include the `kubernetes.io/ingress.allow-http` annotation, set to `false`. By default a valid TLS {} configuration is required, this can be made optional by setting the `tlsOptional` parameter to `true`. https://kubernetes.io/docs/concepts/services-networking/ingress/#tls No
K8sImageDigests Requires container images to contain a digest. https://kubernetes.io/docs/concepts/containers/images/ No
K8sLocalStorageRequireSafeToEvict Requires Pods using local storage (`emptyDir` or `hostPath`) to have the annotation `"cluster-autoscaler.kubernetes.io/safe-to-evict": "true"`. Cluster Autoscaler will not delete Pods without this annotation. No
K8sMemoryRequestEqualsLimit Promotes Pod stability by requiring that all containers' requested memory exactly equals the memory limit, so that Pods are never in a state where memory usage exceeds the requested amount. Otherwise, Kubernetes can terminate Pods requesting extra memory if memory is needed on the node. No
K8sNoEnvVarSecrets Prohibits secrets as environment variables in Pod container definitions. Use mounted secret files in data volumes instead: https://kubernetes.io/docs/concepts/configuration/secret/#using-secrets-as-files-from-a-pod No
K8sNoExternalServices Prohibits the creation of known resources that expose workloads to external IPs. This includes Istio Gateway resources and Kubernetes Ingress resources. Kubernetes services are also disallowed unless they meet the following criteria: Any Service of type `LoadBalancer` in Google Cloud must have a `"networking.gke.io/load-balancer-type": "Internal"` annotation. Any Service of type `LoadBalancer` in AWS must have a `service.beta.kubernetes.io/aws-load-balancer-internal: "true` annotation. Any "external IPs" (external to the cluster) bound to the Service must be a member of a range of internal CIDRs as provided to the constraint. No
K8sPSPAllowPrivilegeEscalationContainer Controls restricting escalation to root privileges. Corresponds to the `allowPrivilegeEscalation` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#privilege-escalation No
K8sPSPAllowedUsers Controls the user and group IDs of the container and some volumes. Corresponds to the `runAsUser`, `runAsGroup`, `supplementalGroups`, and `fsGroup` fields in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#users-and-groups No
K8sPSPAppArmor Configures an allow-list of AppArmor profiles for use by containers. This corresponds to specific annotations applied to a PodSecurityPolicy. For information on AppArmor, see https://kubernetes.io/docs/tutorials/clusters/apparmor/ No
K8sPSPAutomountServiceAccountTokenPod Controls the ability of any Pod to enable automountServiceAccountToken. No
K8sPSPCapabilities Controls Linux capabilities on containers. Corresponds to the `allowedCapabilities` and `requiredDropCapabilities` fields in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#capabilities No
K8sPSPFSGroup Controls allocating an FSGroup that owns the Pod's volumes. Corresponds to the `fsGroup` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#volumes-and-file-systems No
K8sPSPFlexVolumes Controls the allowlist of FlexVolume drivers. Corresponds to the `allowedFlexVolumes` field in PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#flexvolume-drivers No
K8sPSPForbiddenSysctls Controls the `sysctl` profile used by containers. Corresponds to the `allowedUnsafeSysctls` and `forbiddenSysctls` fields in a PodSecurityPolicy. When specified, any sysctl not in the `allowedSysctls` parameter is considered to be forbidden. The `forbiddenSysctls` parameter takes precedence over the `allowedSysctls` parameter. For more information, see https://kubernetes.io/docs/tasks/administer-cluster/sysctl-cluster/ No
K8sPSPHostFilesystem Controls usage of the host filesystem. Corresponds to the `allowedHostPaths` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#volumes-and-file-systems No
K8sPSPHostNamespace Disallows sharing of host PID and IPC namespaces by pod containers. Corresponds to the `hostPID` and `hostIPC` fields in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#host-namespaces No
K8sPSPHostNetworkingPorts Controls usage of host network namespace by pod containers. Specific ports must be specified. Corresponds to the `hostNetwork` and `hostPorts` fields in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#host-namespaces No
K8sPSPPrivilegedContainer Controls the ability of any container to enable privileged mode. Corresponds to the `privileged` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#privileged No
K8sPSPProcMount Controls the allowed `procMount` types for the container. Corresponds to the `allowedProcMountTypes` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#allowedprocmounttypes No
K8sPSPReadOnlyRootFilesystem Requires the use of a read-only root file system by pod containers. Corresponds to the `readOnlyRootFilesystem` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#volumes-and-file-systems No
K8sPSPSELinuxV2 Defines an allow-list of seLinuxOptions configurations for pod containers. Corresponds to a PodSecurityPolicy requiring SELinux configs. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#selinux No
K8sPSPSeccomp Controls the seccomp profile used by containers. Corresponds to the `seccomp.security.alpha.kubernetes.io/allowedProfileNames` annotation on a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#seccomp No
K8sPSPVolumeTypes Restricts mountable volume types to those specified by the user. Corresponds to the `volumes` field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#volumes-and-file-systems No
K8sPSPWindowsHostProcess Restricts running of Windows HostProcess containers / pods. See https://kubernetes.io/docs/tasks/configure-pod-container/create-hostprocess-pod/ for more information. No
K8sPSSRunAsNonRoot Requires containers run as non-root users. For more information, see https://kubernetes.io/docs/concepts/security/pod-security-standards/ No
K8sPodDisruptionBudget Disallow the following scenarios when deploying PodDisruptionBudgets or resources that implement the replica subresource (e.g. Deployment, ReplicationController, ReplicaSet, StatefulSet): 1. Deployment of PodDisruptionBudgets with .spec.maxUnavailable == 0 2. Deployment of PodDisruptionBudgets with .spec.minAvailable == .spec.replicas of the resource with replica subresource This will prevent PodDisruptionBudgets from blocking voluntary disruptions such as node draining. https://kubernetes.io/docs/concepts/workloads/pods/disruptions/ Yes
K8sPodResourcesBestPractices Requires that containers are not best-effort (by setting cpu and memory requests) and following burstable best practices (memory request must exactly equal limit). Optionally, annotation keys can be configured to permit skipping the various validations. No
K8sPodsRequireSecurityContext Requires all Pods to define securityContext. Requires all containers defined in Pods to have a SecurityContext defined at the Pod or container level. No
K8sProhibitRoleWildcardAccess Requires that Roles and ClusterRoles not set resource access to a wildcard '"*"' value except for the exempted Roles and ClusterRoles provided as exemptions. Does not restrict wildcard access to subresources, such as '"*/status"'. No
K8sReplicaLimits Requires that objects with the field `spec.replicas` (Deployments, ReplicaSets, etc.) specify a number of replicas within defined ranges. No
K8sRequireAdmissionController Requires either Pod Security Admission or an external policy control system Yes
K8sRequireBinAuthZ Requires the Binary Authorization Validating Admission Webhook. Constraints using this `ConstraintTemplate` will be audit only regardless of `enforcementAction` value. Yes
K8sRequireCosNodeImage Enforces the use of Container-Optimized OS from Google on Nodes. No
K8sRequireDaemonsets Requires the list of daemonsets specified to be present. Yes
K8sRequireDefaultDenyEgressPolicy Requires that every namespace defined in the cluster has a default deny NetworkPolicy for egress. Yes
K8sRequireNamespaceNetworkPolicies Requires that every namespace defined in the cluster has a NetworkPolicy. Yes
K8sRequireValidRangesForNetworks Enforces which CIDR blocks are allowed for network ingress and egress. No
K8sRequiredAnnotations Requires resources to contain specified annotations, with values matching provided regular expressions. No
K8sRequiredLabels Requires resources to contain specified labels, with values matching provided regular expressions. No
K8sRequiredProbes Requires Pods to have readiness and/or liveness probes. No
K8sRequiredResources Requires containers to have defined resources set. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ No
K8sRestrictAdmissionController Restrict dynamic admission controllers to permitted ones No
K8sRestrictAutomountServiceAccountTokens Restricts the use of service accounts tokens. No
K8sRestrictLabels Disallows resources from containing specified labels unless there is an exception for the specific resource. No
K8sRestrictNamespaces Restricts resources from using namespaces listed under the restrictedNamespaces parameter. No
K8sRestrictNfsUrls Disallows resources from containing NFS URLS unless specified. No
K8sRestrictRbacSubjects Restricts the use of names in RBAC subjects to permitted values. No
K8sRestrictRoleBindings Restricts the subjects specified in ClusterRoleBindings and RoleBindings to a list of allowed subjects. No
K8sRestrictRoleRules Restricts rules that can be set on Role and ClusterRole objects. No
K8sStorageClass Requires storage classes to be specified when used. Only Gatekeeper 3.9+ and non-ephemeral containers are supported. Yes
K8sUniqueIngressHost Requires all Ingress rule hosts to be unique. Does not handle hostname wildcards: https://kubernetes.io/docs/concepts/services-networking/ingress/ Yes
K8sUniqueServiceSelector Requires Services to have unique selectors within a namespace. Selectors are considered the same if they have identical keys and values. Selectors may share a key/value pair so long as there is at least one distinct key/value pair between them. https://kubernetes.io/docs/concepts/services-networking/service/#defining-a-service Yes
NoUpdateServiceAccount Blocks updating the service account on resources that abstract over Pods. This policy is ignored in audit mode. No
PolicyStrictOnly Requires that `STRICT` Istio mutual TLS is always specified when using [PeerAuthentication](https://istio.io/latest/docs/reference/config/security/peer_authentication/). This constraint also ensures that the deprecated [Policy](https://istio.io/v1.4/docs/reference/config/security/istio.authentication.v1alpha1/#Policy) and MeshPolicy resources enforce `STRICT` mutual TLS. See: https://istio.io/latest/docs/tasks/security/authentication/mtls-migration/#lock-down-mutual-tls-for-the-entire-mesh No
RestrictNetworkExclusions

Controls which inbound ports, outbound ports, and outbound IP ranges can be excluded from Istio network capture. Ports and IP ranges that bypass Istio network capture are not handled by the Istio proxy and are not subject to Istio mTLS authentication, authorization policy, and other Istio features. This constraint can be used to apply restrictions to the use of the following annotations:

  • traffic.sidecar.istio.io/excludeInboundPorts
  • traffic.sidecar.istio.io/excludeOutboundPorts
  • traffic.sidecar.istio.io/excludeOutboundIPRanges

See https://istio.io/latest/docs/reference/config/annotations/.

When restricting outbound IP ranges, the constraint calculates whether excluded IP ranges match or are a subset of the allowed IP range exclusions.

When using this constraint all inbound ports, outbound ports and outbound IP ranges must always be included by either setting the corresponding "include" annotations to `"*"` or leaving them unset. Setting any of the following annotations to anything other than `"*"` is not allowed:

  • traffic.sidecar.istio.io/includeInboundPorts
  • traffic.sidecar.istio.io/includeOutboundPorts
  • traffic.sidecar.istio.io/includeOutboundIPRanges

This constraint always allows port 15020 to be excluded because the Istio sidecar injector always adds it to the traffic.sidecar.istio.io/excludeInboundPorts annotation so that it can be used for health checking.

No
SourceNotAllAuthz Requires that Istio AuthorizationPolicy rules have source principals set to something other than "*". https://istio.io/latest/docs/reference/config/security/authorization-policy/ No
VerifyDeprecatedAPI Verifies deprecated Kubernetes APIs to ensure all the API versions are up to date. This template does not apply to audit as audit looks at the resources which are already present in the cluster with non-deprecated API versions. No

AllowedServicePortName

Allowed Service Port Names v1.0.1

Requires that service port names have a prefix from a specified list.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AllowedServicePortName
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # prefixes <array>: Prefixes of allowed service port names.
    prefixes:
      - <string>

Examples

port-name-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AllowedServicePortName
metadata:
  name: port-name-constraint
spec:
  enforcementAction: deny
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Service
  parameters:
    prefixes:
    - http-
    - http2-
    - grpc-
    - mongo-
    - redis-
    - tcp-
Allowed
apiVersion: v1
kind: Service
metadata:
  labels:
    app: helloworld
  name: port-name-http
spec:
  ports:
  - name: http-helloport
    port: 5000
  selector:
    app: helloworld
Disallowed
apiVersion: v1
kind: Service
metadata:
  labels:
    app: helloworld
  name: port-name-tcp
spec:
  ports:
  - name: foo-helloport
    port: 5000
  selector:
    app: helloworld
apiVersion: v1
kind: Service
metadata:
  labels:
    app: helloworld
  name: port-name-bad
spec:
  ports:
  - name: helloport
    port: 5000
  selector:
    app: helloworld

AsmAuthzPolicyDefaultDeny

ASM AuthorizationPolicy Default Deny v1.0.4

Enforce the mesh level default deny AuthorizationPolicy. Reference to https://istio.io/latest/docs/ops/best-practices/security/#use-default-deny-patterns.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # rootNamespace <string>: Anthos Service Mesh root namespace, default value
    # is "istio-system" if not specified.
    rootNamespace: <string>
    # strictnessLevel <string>: Level of AuthorizationPolicy strictness.
    # Allowed Values: Low, High
    strictnessLevel: <string>

Referential Constraint

This constraint is referential. Prior to use, you must enable referential constraints and create a config that tells Policy Controller what kinds of objects to watch.

Your Policy Controller Config will require a syncOnly entry similar to:

spec:
  sync:
    syncOnly:
      - group: "security.istio.io"
        version: "v1beta1"
        kind: "AuthorizationPolicy"

Examples

asm-authz-policy-default-deny-with-input-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: istio-system
    strictnessLevel: High
Allowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: istio-system
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: default-deny-no-action
  namespace: istio-system
spec: null
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: istio-system
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: default-deny-with-action
  namespace: istio-system
spec:
  action: ALLOW
Disallowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: istio-system
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: not-default-deny
  namespace: istio-system
spec:
  action: DENY
  rules:
  - to:
    - operation:
        notMethods:
        - GET
        - POST
asm-authz-policy-default-deny-no-input-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
Allowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: default-deny-no-action
  namespace: istio-system
spec: null
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: default-deny-with-action
  namespace: istio-system
spec:
  action: ALLOW
Disallowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDefaultDeny
metadata:
  name: asm-authz-policy-default-deny-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: not-default-deny
  namespace: istio-system
spec:
  action: DENY
  rules:
  - to:
    - operation:
        notMethods:
        - GET
        - POST

AsmAuthzPolicyDisallowedPrefix

ASM AuthorizationPolicy Disallowed Prefixes v1.0.2

Requires that principals and namespaces in Istio AuthorizationPolicy rules not have a prefix from a specified list. https://istio.io/latest/docs/reference/config/security/authorization-policy/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDisallowedPrefix
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # disallowedNamespacePrefixes <array>: Disallowed prefixes for namespaces.
    disallowedNamespacePrefixes:
      - <string>
    # disallowedPrincipalPrefixes <array>: Disallowed prefixes for principals.
    disallowedPrincipalPrefixes:
      - <string>

Examples

asm-authz-policy-disallowed-prefix-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyDisallowedPrefix
metadata:
  name: asm-authz-policy-disallowed-prefix-constraint
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - AuthorizationPolicy
  parameters:
    disallowedNamespacePrefixes:
    - bad-ns-prefix
    - worse-ns-prefix
    disallowedPrincipalPrefixes:
    - bad-principal-prefix
    - worse-principal-prefix
Allowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: valid-authz-policy
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
    - source:
        namespaces:
        - test
  selector:
    matchLabels:
      app: httpbin
Disallowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-source-principal
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/worse-principal-prefix-sleep
    - source:
        namespaces:
        - test
  selector:
    matchLabels:
      app: httpbin
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-source-namespace
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
    - source:
        namespaces:
        - bad-ns-prefix-test
  selector:
    matchLabels:
      app: httpbin

AsmAuthzPolicyEnforceSourcePrincipals

ASM AuthorizationPolicy Enforcement Principals v1.0.2

Requires that Istio AuthorizationPolicy "from" field, when defined, has source principles, which must be set to something other than "*". https://istio.io/latest/docs/reference/config/security/authorization-policy/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyEnforceSourcePrincipals
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

asm-authz-policy-enforce-source-principals-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyEnforceSourcePrincipals
metadata:
  name: asm-authz-policy-enforce-source-principals-constraint
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - AuthorizationPolicy
Allowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: valid-authz-policy
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
Disallowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: no-source-principals
spec:
  rules:
  - from:
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: source-principals-wildcard
spec:
  rules:
  - from:
    - source:
        principals:
        - '*'
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: source-principals-contains-wildcard
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
        - '*'
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin

AsmAuthzPolicyNormalization

ASM AuthorizationPolicy Normalization v1.0.2

Enforce the AuthorizationPolicy normalization. Reference to https://istio.io/latest/docs/reference/config/security/normalization/.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyNormalization
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

asm-authz-policy-normalization-sample
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicyNormalization
metadata:
  name: asm-authz-policy-normalization-sample
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - AuthorizationPolicy
Allowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: good-authz-policy
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        methods:
        - GET
        paths:
        - /test/foo
  - when:
    - key: source.ip
      values:
      - 10.1.2.3
      - 10.2.0.0/16
    - key: request.headers[User-Agent]
      values:
      - Mozilla/*
  selector:
    matchLabels:
      app: httpbin
Disallowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-method-lowercase
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        methods:
        - get
  selector:
    matchLabels:
      app: httpbin
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-request-header-whitespace
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        methods:
        - GET
  - when:
    - key: source.ip
      values:
      - 10.1.2.3
      - 10.2.0.0/16
    - key: request.headers[User-Ag ent]
      values:
      - Mozilla/*
  selector:
    matchLabels:
      app: httpbin
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: path-unnormalized
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        methods:
        - GET
        paths:
        - /test\/foo
  - when:
    - key: source.ip
      values:
      - 10.1.2.3
      - 10.2.0.0/16
    - key: request.headers[User-Agent]
      values:
      - Mozilla/*
  selector:
    matchLabels:
      app: httpbin

AsmAuthzPolicySafePattern

ASM AuthorizationPolicy Safe Patterns v1.0.4

Enforce the AuthorizationPolicy safe patterns. Reference to https://istio.io/latest/docs/ops/best-practices/security/#safer-authorization-policy-patterns.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicySafePattern
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # strictnessLevel <string>: Level of AuthorizationPolicy strictness.
    # Allowed Values: Low, High
    strictnessLevel: <string>

Examples

asm-authz-policy-safe-pattern-sample
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmAuthzPolicySafePattern
metadata:
  name: asm-authz-policy-safe-pattern-sample
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - AuthorizationPolicy
  parameters:
    strictnessLevel: High
Allowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: good-authz-policy-istio-ingress
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        - test.com:*
        methods:
        - GET
  selector:
    matchLabels:
      istio: ingressgateway
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: good-authz-policy-asm-ingress
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        - test.com:*
        methods:
        - GET
  selector:
    matchLabels:
      asm: ingressgateway
Disallowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: hosts-on-noningress
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        - test.com:*
        methods:
        - GET
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: invalid-hosts
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        methods:
        - GET
  selector:
    matchLabels:
      istio: ingressgateway
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: allow-negative-match
spec:
  action: ALLOW
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        - test.com:*
        notMethods:
        - GET
  selector:
    matchLabels:
      istio: ingressgateway
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: deny-positive-match
spec:
  action: DENY
  rules:
  - to:
    - operation:
        hosts:
        - test.com
        - test.com:*
        methods:
        - GET
  selector:
    matchLabels:
      istio: ingressgateway

AsmIngressgatewayLabel

ASM Ingress Gateway Label v1.0.3

Enforce the istio ingressgateway label usage only on ingressgateway pods.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmIngressgatewayLabel
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

asm-ingressgateway-label-sample
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmIngressgatewayLabel
metadata:
  name: asm-ingressgateway-label-sample
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: sleep
    istio: istio
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: istio-ingressgateway
    istio: ingressgateway
  name: istio-ingressgateway
spec:
  containers:
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: asm-ingressgateway
    asm: ingressgateway
  name: asm-ingressgateway
spec:
  containers:
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: sleep
    istio: ingressgateway
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: sleep
    asm: ingressgateway
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: sleep
    istio: ingressgateway
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP

AsmPeerAuthnMeshStrictMtls

ASM Peer Authentication Mesh Strict mTLS v1.0.4

Enforce the mesh level strict mtls PeerAuthentication. Reference to https://istio.io/latest/docs/ops/best-practices/security/#mutual-tls.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # rootNamespace <string>: Anthos Service Mesh root namespace, default value
    # is "istio-system" if not specified.
    rootNamespace: <string>
    # strictnessLevel <string>: Level of PeerAuthentication strictness.
    # Allowed Values: Low, High
    strictnessLevel: <string>

Referential Constraint

This constraint is referential. Prior to use, you must enable referential constraints and create a config that tells Policy Controller what kinds of objects to watch.

Your Policy Controller Config will require a syncOnly entry similar to:

spec:
  sync:
    syncOnly:
      - group: "security.istio.io"
        version: "v1beta1"
        kind: "PeerAuthentication"

Examples

asm-peer-authn-mesh-strict-mtls-with-input-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: asm-root
    strictnessLevel: High
Allowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: asm-root
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: mesh-strict-mtls
  namespace: asm-root
spec:
  mtls:
    mode: STRICT
Disallowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-with-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    rootNamespace: asm-root
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: mesh-permissive-mtls
  namespace: asm-root
spec:
  mtls:
    mode: PERMISSIVE
asm-peer-authn-mesh-strict-mtls-no-input-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
Allowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: mesh-strict-mtls
  namespace: istio-system
spec:
  mtls:
    mode: STRICT
Disallowed
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnMeshStrictMtls
metadata:
  name: asm-peer-authn-mesh-strict-mtls-no-input-constraint
spec:
  enforcementAction: dryrun
  parameters:
    strictnessLevel: High
---
# Referential Data
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: mesh-permissive-mtls
  namespace: istio-system
spec:
  mtls:
    mode: PERMISSIVE

AsmPeerAuthnStrictMtls

ASM Peer Authentication Strict mTLS v1.0.3

Enforce all PeerAuthentications cannot overwrite strict mtls. Reference to https://istio.io/latest/docs/ops/best-practices/security/#mutual-tls.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnStrictMtls
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # strictnessLevel <string>: Level of PeerAuthentication strictness.
    # Allowed Values: Low, High
    strictnessLevel: <string>

Examples

asm-peer-authn-strict-mtls-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmPeerAuthnStrictMtls
metadata:
  name: asm-peer-authn-strict-mtls-constraint
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - PeerAuthentication
  parameters:
    strictnessLevel: High
Allowed
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: valid-strict-mtls-pa
  namespace: foo
spec:
  mtls:
    mode: UNSET
  portLevelMtls:
    "80":
      mode: UNSET
    "443":
      mode: STRICT
  selector:
    matchLabels:
      app: bar
Disallowed
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: invalid-permissive-mtls-pa
  namespace: foo
spec:
  mtls:
    mode: PERMISSIVE
  portLevelMtls:
    "80":
      mode: UNSET
    "443":
      mode: STRICT
  selector:
    matchLabels:
      app: bar
apiVersion: security.istio.io/v1beta1
kind: PeerAuthentication
metadata:
  name: invalid-port-disable-mtls-pa
  namespace: foo
spec:
  mtls:
    mode: UNSET
  portLevelMtls:
    "80":
      mode: DISABLE
    "443":
      mode: STRICT
  selector:
    matchLabels:
      app: bar

AsmRequestAuthnProhibitedOutputHeaders

ASM RequestAuthentication Prohibited Output Headers v1.0.2

In RequestAuthentication, enforce the jwtRules.outPayloadToHeader field to not contain well known HTTP request headers or custom prohibited headers. Reference to https://istio.io/latest/docs/reference/config/security/jwt/#JWTRule.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmRequestAuthnProhibitedOutputHeaders
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # prohibitedHeaders <array>: User predefined prohibited headers.
    prohibitedHeaders:
      - <string>

Examples

asm-request-authn-prohibited-output-headers-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmRequestAuthnProhibitedOutputHeaders
metadata:
  name: asm-request-authn-prohibited-output-headers-constraint
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - RequestAuthentication
  parameters:
    prohibitedHeaders:
    - Bad-Header
    - X-Bad-Header
Allowed
apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: valid-request-authn
  namespace: istio-system
spec:
  jwtRules:
  - issuer: example.com
    outputPayloadToHeader: Good-Header
  selector:
    matchLabels:
      app: istio-ingressgateway
Disallowed
apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: deny-predefined-output-header
  namespace: istio-system
spec:
  jwtRules:
  - issuer: example.com
    outputPayloadToHeader: Host
  selector:
    matchLabels:
      app: istio-ingressgateway
apiVersion: security.istio.io/v1beta1
kind: RequestAuthentication
metadata:
  name: deny-predefined-output-header
  namespace: istio-system
spec:
  jwtRules:
  - issuer: example.com
    outputPayloadToHeader: X-Bad-Header
  selector:
    matchLabels:
      app: istio-ingressgateway

AsmSidecarInjection

ASM Sidecar Injection v1.0.2

Enforce the istio proxy sidecar always been injected to workload pods.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmSidecarInjection
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # strictnessLevel <string>: Level of sidecar injection strictness.
    # Allowed Values: Low, High
    strictnessLevel: <string>

Examples

asm-sidecar-injection-sample
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: AsmSidecarInjection
metadata:
  name: asm-sidecar-injection-sample
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    strictnessLevel: High
Allowed
apiVersion: v1
kind: Pod
metadata:
  annotations:
    sidecar.istio.io/inject: "true"
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP
apiVersion: v1
kind: Pod
metadata:
  annotations:
    "false": "false"
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep
  - image: gcr.io/gke-release/asm/proxyv2:release
    name: istio-proxy
    ports:
    - containerPort: 15090
      name: http-envoy-prom
      protocol: TCP
Disallowed
apiVersion: v1
kind: Pod
metadata:
  annotations:
    sidecar.istio.io/inject: "false"
  name: sleep
spec:
  containers:
  - image: curlimages/curl
    name: sleep

DestinationRuleTLSEnabled

Destination Rule TLS Enabled v1.0.1

Prohibits disabling TLS for all hosts and host subsets in Istio DestinationRules.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: DestinationRuleTLSEnabled
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

dr-tls-enabled
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: DestinationRuleTLSEnabled
metadata:
  name: dr-tls-enabled
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - networking.istio.io
      kinds:
      - DestinationRule
Disallowed
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: dr-subset-tls-disable
  namespace: default
spec:
  host: myservice
  subsets:
  - name: v1
    trafficPolicy:
      tls:
        mode: DISABLE
  - name: v2
    trafficPolicy:
      tls:
        mode: SIMPLE
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: dr-traffic-tls-disable
  namespace: default
spec:
  host: myservice
  trafficPolicy:
    tls:
      mode: DISABLE

DisallowedAuthzPrefix

Disallow Istio AuthorizationPolicy Prefixes v1.0.2

Requires that principals and namespaces in Istio AuthorizationPolicy rules not have a prefix from a specified list. https://istio.io/latest/docs/reference/config/security/authorization-policy/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: DisallowedAuthzPrefix
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # disallowedprefixes <array>: Disallowed prefixes of principals and
    # namespaces.
    disallowedprefixes:
      - <string>

Examples

disallowed-authz-prefix-constraint
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: DisallowedAuthzPrefix
metadata:
  name: disallowed-authz-prefix-constraint
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - security.istio.io
      kinds:
      - AuthorizationPolicy
  parameters:
    disallowedprefixes:
    - badprefix
    - reallybadprefix
Allowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: good
  namespace: foo
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
      version: v1
Disallowed
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-source-principal
  namespace: foo
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/badprefix-sleep
    - source:
        namespaces:
        - test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
      version: v1
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: bad-source-namespace
  namespace: foo
spec:
  rules:
  - from:
    - source:
        principals:
        - cluster.local/ns/default/sa/sleep
    - source:
        namespaces:
        - badprefix-test
    to:
    - operation:
        methods:
        - GET
        paths:
        - /info*
    - operation:
        methods:
        - POST
        paths:
        - /data
    when:
    - key: request.auth.claims[iss]
      values:
      - https://accounts.google.com
  selector:
    matchLabels:
      app: httpbin
      version: v1

GCPStorageLocationConstraintV1

GCP Storage Location Constraint v1.0.3

Restricts the permitted locations for StorageBucket Config Connector resources to the list of locations provided in the constraint. Bucket names in the exemptions list are exempt.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: GCPStorageLocationConstraintV1
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptions <array>: A list of bucket names that are exempt from this
    # constraint.
    exemptions:
      - <string>
    # locations <array>: A list of locations that a bucket is permitted to
    # have.
    locations:
      - <string>

Examples

singapore-and-jakarta-only
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: GCPStorageLocationConstraintV1
metadata:
  name: singapore-and-jakarta-only
spec:
  enforcementAction: deny
  match:
    kinds:
    - apiGroups:
      - storage.cnrm.cloud.google.com
      kinds:
      - StorageBucket
  parameters:
    exemptions:
    - my_project_id_cloudbuild
    locations:
    - asia-southeast1
    - asia-southeast2
Allowed
apiVersion: storage.cnrm.cloud.google.com/v1beta1
kind: StorageBucket
metadata:
  name: bucket-in-permitted-location
spec:
  location: asia-southeast1
Disallowed
apiVersion: storage.cnrm.cloud.google.com/v1beta1
kind: StorageBucket
metadata:
  name: bucket-in-disallowed-location
spec:
  location: us-central1
apiVersion: storage.cnrm.cloud.google.com/v1beta1
kind: StorageBucket
metadata:
  name: bucket-without-specific-location
spec: null

GkeSpotVMTerminationGrace

Restricts terminationGracePeriodSeconds for GKE Spot VMs v1.1.3

Requires Pods and Pod Templates with nodeSelector or nodeAfffinty of gke-spot to have a terminationGracePeriodSeconds of 15s or less.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: GkeSpotVMTerminationGrace
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # includePodOnSpotNodes <boolean>: Require `terminationGracePeriodSeconds`
    # of 15s or less for all `Pod` on a `gke-spot` Node.
    includePodOnSpotNodes: <boolean>

Referential Constraint

This constraint is referential. Prior to use, you must enable referential constraints and create a config that tells Policy Controller what kinds of objects to watch.

Your Policy Controller Config will require a syncOnly entry similar to:

spec:
  sync:
    syncOnly:
      - group: ""
        version: "v1"
        kind: "Node"

Examples

spotvm-termination-grace
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: GkeSpotVMTerminationGrace
metadata:
  name: spotvm-termination-grace
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    includePodOnSpotNodes: true
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: example-allowed
spec:
  containers:
  - image: nginx
    name: nginx
  nodeSelector:
    cloud.google.com/gke-spot: "true"
  terminationGracePeriodSeconds: 15
apiVersion: v1
kind: Pod
metadata:
  name: example-allowed
spec:
  containers:
  - image: nginx
    name: nginx
  nodeSelector:
    cloud.google.com/gke-spot: "true"
  terminationGracePeriodSeconds: 15
apiVersion: v1
kind: Pod
metadata:
  name: example-with-termGrace
spec:
  Nodename: default
  containers:
  - image: nginx
    name: nginx
  terminationGracePeriodSeconds: 15
---
# Referential Data
apiVersion: v1
kind: Node
metadata:
  labels:
    cloud.google.com/gke-spot: "true"
  name: default
apiVersion: v1
kind: Pod
metadata:
  name: example-with-termGrace
spec:
  Nodename: default
  containers:
  - image: nginx
    name: nginx
  terminationGracePeriodSeconds: 15
---
# Referential Data
apiVersion: v1
kind: Node
metadata:
  name: default
apiVersion: v1
kind: Pod
metadata:
  name: example-without-termGrace
spec:
  Nodename: default
  containers:
  - image: nginx
    name: nginx
---
# Referential Data
apiVersion: v1
kind: Node
metadata:
  name: default
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: example-disallowed
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: cloud.google.com/gke-spot
            operator: In
            values:
            - "true"
  containers:
  - image: nginx
    name: nginx
  terminationGracePeriodSeconds: 30
apiVersion: v1
kind: Pod
metadata:
  name: example-disallowed
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: cloud.google.com/gke-spot
            operator: In
            values:
            - "true"
  containers:
  - image: nginx
    name: nginx
apiVersion: v1
kind: Pod
metadata:
  name: example-disallowed
spec:
  containers:
  - image: nginx
    name: nginx
  nodeSelector:
    cloud.google.com/gke-spot: "true"
  terminationGracePeriodSeconds: 30
apiVersion: v1
kind: Pod
metadata:
  name: example-disallowed
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: cloud.google.com/gke-spot
            operator: In
            values:
            - "true"
  containers:
  - image: nginx
    name: nginx
apiVersion: v1
kind: Pod
metadata:
  name: example-without-termGrace
spec:
  Nodename: default
  containers:
  - image: nginx
    name: nginx
---
# Referential Data
apiVersion: v1
kind: Node
metadata:
  labels:
    cloud.google.com/gke-spot: "true"
  name: default

K8sAllowedRepos

Allowed Repositories v1.0.1

Requires container images to begin with a string from the specified list.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sAllowedRepos
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # repos <array>: The list of prefixes a container image is allowed to have.
    repos:
      - <string>

Examples

repo-is-openpolicyagent
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sAllowedRepos
metadata:
  name: repo-is-openpolicyagent
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
    namespaces:
    - default
  parameters:
    repos:
    - openpolicyagent/
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: nginx-disallowed
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
apiVersion: v1
kind: Pod
metadata:
  name: nginx-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
  initContainers:
  - image: nginx
    name: nginxinit
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
apiVersion: v1
kind: Pod
metadata:
  name: nginx-disallowed
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
  initContainers:
  - image: nginx
    name: nginxinit
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
apiVersion: v1
kind: Pod
metadata:
  name: nginx-disallowed
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
  ephemeralContainers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 30Mi
  initContainers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 30Mi

K8sAvoidUseOfSystemMastersGroup

Disallow the use of 'system:masters' group v1.0.0

Disallows the use of 'system:masters' group. Has no effect during audit.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sAvoidUseOfSystemMastersGroup
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # allowlistedUsernames <array>: allowlistedUsernames is the list of
    # usernames that are allowed to use system:masters group.
    allowlistedUsernames:
      - <string>

Examples

avoid-use-of-system-masters-group
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sAvoidUseOfSystemMastersGroup
metadata:
  name: avoid-use-of-system-masters-group
Allowed
apiVersion: v1
kind: Namespace
metadata:
  name: example-namespace

K8sBlockAllIngress

Block all Ingress v1.0.4

Disallows the creation of Ingress objects (Ingress, Gateway, and Service types of NodePort and LoadBalancer).

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockAllIngress
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # allowList <array>: A list of regular expressions for the Ingress object
    # names that are exempt from the constraint.
    allowList:
      - <string>

Examples

block-all-ingress
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockAllIngress
metadata:
  name: block-all-ingress
spec:
  enforcementAction: dryrun
  parameters:
    allowList:
    - name1
    - name2
    - name3
    - my-*
Allowed
apiVersion: v1
kind: Service
metadata:
  name: my-service
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 9376
  selector:
    app.kubernetes.io/name: MyApp
  type: LoadBalancer
apiVersion: v1
kind: Service
metadata:
  name: allowed-clusterip-service-example
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 9376
  selector:
    app.kubernetes.io/name: MyApp
  type: ClusterIP
Disallowed
apiVersion: v1
kind: Service
metadata:
  name: disallowed-service-example
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 9376
  selector:
    app.kubernetes.io/name: MyApp
  type: LoadBalancer
apiVersion: v1
kind: Service
metadata:
  name: disallowed-service-example
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 9376
  selector:
    app.kubernetes.io/name: MyApp
  type: LoadBalancer
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: disallowed-gateway-example
spec:
  gatewayClassName: istio
  listeners:
  - allowedRoutes:
      namespaces:
        from: All
    hostname: '*.example.com'
    name: default
    port: 80
    protocol: HTTP

K8sBlockCreationWithDefaultServiceAccount

Block Creation with Default Service Account v1.0.2

Disallows the creation of resources using a default service account. Has no effect during audit.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockCreationWithDefaultServiceAccount
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-creation-with-default-serviceaccount
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockCreationWithDefaultServiceAccount
metadata:
  name: block-creation-with-default-serviceaccount
spec:
  enforcementAction: dryrun
Allowed
apiVersion: v1
kind: Namespace
metadata:
  name: example-namespace

K8sBlockEndpointEditDefaultRole

Block Endpoint Edit Default Role v1.0.0

Many Kubernetes installations by default have a system:aggregate-to-edit ClusterRole which does not properly restrict access to editing Endpoints. This ConstraintTemplate forbids the system:aggregate-to-edit ClusterRole from granting permission to create/patch/update Endpoints. ClusterRole/system:aggregate-to-edit should not allow Endpoint edit permissions due to CVE-2021-25740, Endpoint & EndpointSlice permissions allow cross-Namespace forwarding, https://github.com/kubernetes/kubernetes/issues/103675

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockEndpointEditDefaultRole
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-endpoint-edit-default-role
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockEndpointEditDefaultRole
metadata:
  name: block-endpoint-edit-default-role
spec:
  match:
    kinds:
    - apiGroups:
      - rbac.authorization.k8s.io
      kinds:
      - ClusterRole
Allowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
  name: system:aggregate-to-edit
rules:
- apiGroups:
  - ""
  resources:
  - pods/attach
  - pods/exec
  - pods/portforward
  - pods/proxy
  - secrets
  - services/proxy
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - serviceaccounts
  verbs:
  - impersonate
- apiGroups:
  - ""
  resources:
  - pods
  - pods/attach
  - pods/exec
  - pods/portforward
  - pods/proxy
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - ""
  resources:
  - configmaps
  - persistentvolumeclaims
  - replicationcontrollers
  - replicationcontrollers/scale
  - secrets
  - serviceaccounts
  - services
  - services/proxy
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - apps
  resources:
  - daemonsets
  - deployments
  - deployments/rollback
  - deployments/scale
  - replicasets
  - replicasets/scale
  - statefulsets
  - statefulsets/scale
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - autoscaling
  resources:
  - horizontalpodautoscalers
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - batch
  resources:
  - cronjobs
  - jobs
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - extensions
  resources:
  - daemonsets
  - deployments
  - deployments/rollback
  - deployments/scale
  - ingresses
  - networkpolicies
  - replicasets
  - replicasets/scale
  - replicationcontrollers/scale
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - policy
  resources:
  - poddisruptionbudgets
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - networking.k8s.io
  resources:
  - ingresses
  - networkpolicies
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
Disallowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
  name: system:aggregate-to-edit
rules:
- apiGroups:
  - ""
  resources:
  - pods/attach
  - pods/exec
  - pods/portforward
  - pods/proxy
  - secrets
  - services/proxy
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - serviceaccounts
  verbs:
  - impersonate
- apiGroups:
  - ""
  resources:
  - pods
  - pods/attach
  - pods/exec
  - pods/portforward
  - pods/proxy
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - ""
  resources:
  - configmaps
  - persistentvolumeclaims
  - replicationcontrollers
  - replicationcontrollers/scale
  - secrets
  - serviceaccounts
  - services
  - services/proxy
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update
- apiGroups:
  - apps
  resources:
  - daemonsets
  - deployments
  - deployments/rollback
  - deployments/scale
  - endpoints
  - replicasets
  - replicasets/scale
  - statefulsets
  - statefulsets/scale
  verbs:
  - create
  - delete
  - deletecollection
  - patch
  - update

K8sBlockLoadBalancer

Block Services with type LoadBalancer v1.0.0

Disallows all Services with type LoadBalancer. https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockLoadBalancer
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-load-balancer
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockLoadBalancer
metadata:
  name: block-load-balancer
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Service
Allowed
apiVersion: v1
kind: Service
metadata:
  name: my-service-allowed
spec:
  ports:
  - port: 80
    targetPort: 80
  type: ClusterIP
Disallowed
apiVersion: v1
kind: Service
metadata:
  name: my-service-disallowed
spec:
  ports:
  - nodePort: 30007
    port: 80
    targetPort: 80
  type: LoadBalancer

K8sBlockNodePort

Block NodePort v1.0.0

Disallows all Services with type NodePort. https://kubernetes.io/docs/concepts/services-networking/service/#nodeport

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockNodePort
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-node-port
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockNodePort
metadata:
  name: block-node-port
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Service
Disallowed
apiVersion: v1
kind: Service
metadata:
  name: my-service-disallowed
spec:
  ports:
  - nodePort: 30007
    port: 80
    targetPort: 80
  type: NodePort

K8sBlockObjectsOfType

Block Objects of Type v1.0.1

Disallows object of forbidden types.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockObjectsOfType
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    forbiddenTypes:
      - <string>

Examples

block-secrets-of-type-basic-auth
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockObjectsOfType
metadata:
  name: block-secrets-of-type-basic-auth
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Secret
  parameters:
    forbiddenTypes:
    - kubernetes.io/basic-auth
Allowed
apiVersion: v1
data:
  password: ZHVtbXlwYXNz
  username: ZHVtbXl1c2Vy
kind: Secret
metadata:
  name: credentials
  namespace: default
type: Opaque
Disallowed
apiVersion: v1
data:
  password: YmFzaWMtcGFzc3dvcmQ=
  username: YmFzaWMtdXNlcm5hbWU=
kind: Secret
metadata:
  name: secret-basic-auth
  namespace: default
type: kubernetes.io/basic-auth

K8sBlockProcessNamespaceSharing

Block Process Namespace Sharing v1.0.1

Prohibits Pod specs with shareProcessNamespace set to true. This avoids scenarios where all containers in a Pod share a PID namespace and can access each other's filesystem and memory.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockProcessNamespaceSharing
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-process-namespace-sharing
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockProcessNamespaceSharing
metadata:
  name: block-process-namespace-sharing
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: good-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: bad-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
  shareProcessNamespace: true

K8sBlockWildcardIngress

Block Wildcard Ingress v1.0.1

Users should not be able to create Ingresses with a blank or wildcard (*) hostname since that would enable them to intercept traffic for other services in the cluster, even if they don't have access to those services.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockWildcardIngress
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

block-wildcard-ingress
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sBlockWildcardIngress
metadata:
  name: block-wildcard-ingress
spec:
  match:
    kinds:
    - apiGroups:
      - extensions
      - networking.k8s.io
      kinds:
      - Ingress
Allowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: non-wildcard-ingress
spec:
  rules:
  - host: myservice.example.com
    http:
      paths:
      - backend:
          service:
            name: example
            port:
              number: 80
        path: /
        pathType: Prefix
Disallowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: wildcard-ingress
spec:
  rules:
  - host: ""
    http:
      paths:
      - backend:
          service:
            name: example
            port:
              number: 80
        path: /
        pathType: Prefix
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: wildcard-ingress
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: example
            port:
              number: 80
        path: /
        pathType: Prefix
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: wildcard-ingress
spec:
  rules:
  - host: '*.example.com'
    http:
      paths:
      - backend:
          service:
            name: example
            port:
              number: 80
        path: /
        pathType: Prefix
  - host: valid.example.com
    http:
      paths:
      - backend:
          service:
            name: example
            port:
              number: 80
        path: /
        pathType: Prefix

K8sContainerEphemeralStorageLimit

Container ephemeral storage limit v1.0.2

Requires containers to have an ephemeral storage limit set and constrains the limit to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerEphemeralStorageLimit
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # ephemeral-storage <string>: The maximum allowed ephemeral storage limit
    # on a Pod, exclusive.
    ephemeral-storage: <string>
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>

Examples

container-ephemeral-storage-limit
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerEphemeralStorageLimit
metadata:
  name: container-ephemeral-storage-limit
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    ephemeral-storage: 500Mi
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 100Mi
        memory: 1Gi
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 100Mi
        memory: 1Gi
  initContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: init-opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 100Mi
        memory: 1Gi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        memory: 2Gi
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 1Pi
        memory: 1Gi
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 100Mi
        memory: 1Gi
  initContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: init-opa
    resources:
      limits:
        cpu: 100m
        ephemeral-storage: 1Pi
        memory: 1Gi

K8sContainerLimits

Container Limits v1.0.1

Requires containers to have memory and CPU limits set and constrains limits to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerLimits
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # cpu <string>: The maximum allowed cpu limit on a Pod, exclusive.
    cpu: <string>
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>
    # memory <string>: The maximum allowed memory limit on a Pod, exclusive.
    memory: <string>

Examples

container-must-have-limits
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerLimits
metadata:
  name: container-must-have-limits
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    cpu: 200m
    memory: 1Gi
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        memory: 1Gi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 100m
        memory: 2Gi

K8sContainerRatios

Container Ratios v1.0.1

Sets a maximum ratio for container resource limits to requests. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerRatios
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # cpuRatio <string>: The maximum allowed ratio of `resources.limits.cpu` to
    # `resources.requests.cpu` on a container. If not specified, equal to
    # `ratio`.
    cpuRatio: <string>
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>
    # ratio <string>: The maximum allowed ratio of `resources.limits` to
    # `resources.requests` on a container.
    ratio: <string>

Examples

container-must-meet-ratio
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerRatios
metadata:
  name: container-must-meet-ratio
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    ratio: "2"
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 200m
        memory: 200Mi
      requests:
        cpu: 100m
        memory: 100Mi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: 800m
        memory: 2Gi
      requests:
        cpu: 100m
        memory: 100Mi
container-must-meet-memory-and-cpu-ratio
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerRatios
metadata:
  name: container-must-meet-memory-and-cpu-ratio
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    cpuRatio: "10"
    ratio: "1"
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: "4"
        memory: 2Gi
      requests:
        cpu: "1"
        memory: 2Gi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      limits:
        cpu: "4"
        memory: 2Gi
      requests:
        cpu: 100m
        memory: 2Gi

K8sContainerRequests

Container Requests v1.0.1

Requires containers to have memory and CPU requests set and constrains requests to be within the specified maximum values. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerRequests
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # cpu <string>: The maximum allowed cpu request on a Pod, exclusive.
    cpu: <string>
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>
    # memory <string>: The maximum allowed memory request on a Pod, exclusive.
    memory: <string>

Examples

container-must-have-requests
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sContainerRequests
metadata:
  name: container-must-have-requests
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    cpu: 200m
    memory: 1Gi
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      requests:
        cpu: 100m
        memory: 1Gi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    owner: me.agilebank.demo
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
    resources:
      requests:
        cpu: 100m
        memory: 2Gi

K8sCronJobAllowedRepos

CronJob Allowed Repositories v1.0.1

Requires container images of CronJobs to begin with a string from the specified list.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sCronJobAllowedRepos
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # repos <array>: The list of prefixes a container image is allowed to have.
    repos:
      - <string>

Examples

cronjob-restrict-repos
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sCronJobAllowedRepos
metadata:
  name: cronjob-restrict-repos
spec:
  match:
    kinds:
    - apiGroups:
      - batch
      kinds:
      - CronJob
  parameters:
    repos:
    - gke.gcr.io/
Allowed
apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - image: gke.gcr.io/busybox:1.28
            name: hello
  schedule: '* * * * *'
Disallowed
apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - image: busybox:1.28
            name: hello
  schedule: '* * * * *'

K8sDisallowAnonymous

Disallow Anonymous Access v1.0.0

Disallows associating ClusterRole and Role resources to the system:anonymous user and system:unauthenticated group.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowAnonymous
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # allowedRoles <array>: The list of ClusterRoles and Roles that may be
    # associated with the `system:unauthenticated` group and `system:anonymous`
    # user.
    allowedRoles:
      - <string>

Examples

no-anonymous
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowAnonymous
metadata:
  name: no-anonymous
spec:
  match:
    kinds:
    - apiGroups:
      - rbac.authorization.k8s.io
      kinds:
      - ClusterRoleBinding
    - apiGroups:
      - rbac.authorization.k8s.io
      kinds:
      - RoleBinding
  parameters:
    allowedRoles:
    - cluster-role-1
Allowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cluster-role-binding-1
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-role-1
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:authenticated
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:unauthenticated
Disallowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cluster-role-binding-2
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-role-2
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:authenticated
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:unauthenticated

K8sDisallowInteractiveTTY

Disallow Interactive TTY Containers v1.0.0

Requires that objects have the fields spec.tty and spec.stdin set to false or unset.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowInteractiveTTY
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>

Examples

no-interactive-tty-containers
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowInteractiveTTY
metadata:
  name: no-interactive-tty-containers
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
Allowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: nginx-interactive-tty
  name: nginx-interactive-tty-allowed
spec:
  containers:
  - image: nginx
    name: nginx
    stdin: false
    tty: false
Disallowed
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: nginx-privilege-escalation
  name: nginx-privilege-escalation-disallowed
spec:
  containers:
  - image: nginx
    name: nginx
    stdin: true
    tty: true

K8sDisallowedRepos

Disallowed Repositories v1.0.0

Disallowed container repositories that begin with a string from the specified list.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedRepos
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # repos <array>: The list of prefixes a container image is not allowed to
    # have.
    repos:
      - <string>

Examples

repo-must-not-be-k8s-gcr-io
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedRepos
metadata:
  name: repo-must-not-be-k8s-gcr-io
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
  parameters:
    repos:
    - k8s.gcr.io/
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: kustomize-allowed
spec:
  containers:
  - image: registry.k8s.io/kustomize/kustomize:v3.8.9
    name: kustomize
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: kustomize-disallowed
spec:
  containers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomize
apiVersion: v1
kind: Pod
metadata:
  name: kustomize-disallowed
spec:
  containers:
  - image: registry.k8s.io/kustomize/kustomize:v3.8.9
    name: kustomize
  initContainers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomizeinit
apiVersion: v1
kind: Pod
metadata:
  name: kustomize-disallowed
spec:
  containers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomize
  initContainers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomizeinit
apiVersion: v1
kind: Pod
metadata:
  name: kustomize-disallowed
spec:
  containers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomize
  ephemeralContainers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomize
  initContainers:
  - image: k8s.gcr.io/kustomize/kustomize:v3.8.9
    name: kustomize

K8sDisallowedRoleBindingSubjects

Disallowed Rolebinding Subjects v1.0.1

Prohibits RoleBindings or ClusterRoleBindings with subjects matching any disallowedSubjects passed as parameters.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedRoleBindingSubjects
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # disallowedSubjects <array>: A list of subjects that cannot appear in a
    # RoleBinding.
    disallowedSubjects:
      - # apiGroup <string>: The Kubernetes API group of the disallowed role
        # binding subject. Currently ignored.
        apiGroup: <string>
        # kind <string>: The kind of the disallowed role binding subject.
        kind: <string>
        # name <string>: The name of the disallowed role binding subject.
        name: <string>

Examples

disallowed-rolebinding-subjects
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedRoleBindingSubjects
metadata:
  name: disallowed-rolebinding-subjects
spec:
  parameters:
    disallowedSubjects:
    - apiGroup: rbac.authorization.k8s.io
      kind: Group
      name: system:unauthenticated
Allowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: good-clusterrolebinding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: my-role
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:authenticated
Disallowed
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: bad-clusterrolebinding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: my-role
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: Group
  name: system:unauthenticated

K8sDisallowedTags

Disallow tags v1.0.1

Requires container images to have an image tag different from the ones in the specified list. https://kubernetes.io/docs/concepts/containers/images/#image-names

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedTags
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>
    # tags <array>: Disallowed container image tags.
    tags:
      - <string>

Examples

container-image-must-not-have-latest-tag
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sDisallowedTags
metadata:
  name: container-image-must-not-have-latest-tag
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
    namespaces:
    - default
  parameters:
    exemptImages:
    - openpolicyagent/opa-exp:latest
    - openpolicyagent/opa-exp2:latest
    tags:
    - latest
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
apiVersion: v1
kind: Pod
metadata:
  name: opa-exempt-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa-exp:latest
    name: opa-exp
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/init:v1
    name: opa-init
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa-exp2:latest
    name: opa-exp2
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa
    name: opa
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed-2
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:latest
    name: opa
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed-ephemeral
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
  ephemeralContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:latest
    name: opa
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed-3
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa-exp:latest
    name: opa
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/init:latest
    name: opa-init
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa-exp2:latest
    name: opa-exp2
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/monitor:latest
    name: opa-monitor

K8sEmptyDirHasSizeLimit

Empty Directory has Size Limit v1.0.5

Requires that any emptyDir volumes specify a sizeLimit. Optionally, a maxSizeLimit parameter can be supplied in the constraint to specify a maximum allowable size limit.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEmptyDirHasSizeLimit
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptVolumesRegex <array>: Exempt Volume names as regex match.
    exemptVolumesRegex:
      - <string>
    # maxSizeLimit <string>: When set, the declared size limit for each volume
    # must be less than `maxSizeLimit`.
    maxSizeLimit: <string>

Examples

empty-dir-has-size-limit
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEmptyDirHasSizeLimit
metadata:
  name: empty-dir-has-size-limit
spec:
  match:
    excludedNamespaces:
    - istio-system
    - kube-system
    - gatekeeper-system
  parameters:
    exemptVolumesRegex:
    - ^istio-[a-z]+$
    maxSizeLimit: 4Gi
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: good-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
  volumes:
  - emptyDir:
      sizeLimit: 2Gi
    name: good-pod-volume
apiVersion: v1
kind: Pod
metadata:
  name: exempt-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
  volumes:
  - emptyDir: {}
    name: istio-envoy
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: bad-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
  volumes:
  - emptyDir: {}
    name: bad-pod-volume

K8sEnforceCloudArmorBackendConfig

Enforce Cloud Armor on BackendConfig Resources v1.0.2

Enforces Cloud Armor configuration on BackendConfig resources

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEnforceCloudArmorBackendConfig
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

enforce-cloudarmor-backendconfig
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEnforceCloudArmorBackendConfig
metadata:
  name: enforce-cloudarmor-backendconfig
spec:
  enforcementAction: dryrun
Allowed
apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: my-backendconfig
  namespace: examplenamespace
spec:
  securityPolicy:
    name: example-security-policy
apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: second-backendconfig
spec:
  securityPolicy:
    name: my-security-policy
Disallowed
apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: my-backendconfig
  namespace: examplenamespace
spec:
  securityPolicy:
    name: null
apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: my-backendconfig
  namespace: examplenamespace
spec:
  securityPolicy:
    name: ""
apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: my-backendconfig
spec:
  logging:
    enable: true
    sampleRate: 0.5

K8sEnforceConfigManagement

Enforce Config Management v1.1.6

Requires the presence and operation of Config Management. Constraints using this ConstraintTemplate will be audit only regardless of enforcementAction value.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEnforceConfigManagement
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # requireDriftPrevention <boolean>: Require Config Sync drift prevention to
    # prevent config drift.
    requireDriftPrevention: <boolean>
    # requireRootSync <boolean>: Require a Config Sync `RootSync` object for
    # cluster config management.
    requireRootSync: <boolean>

Referential Constraint

This constraint is referential. Prior to use, you must enable referential constraints and create a config that tells Policy Controller what kinds of objects to watch.

Your Policy Controller Config will require a syncOnly entry similar to:

spec:
  sync:
    syncOnly:
      - group: "configsync.gke.io"
        version: "v1beta1"
        kind: "RootSync"

Examples

enforce-config-management
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sEnforceConfigManagement
metadata:
  name: enforce-config-management
spec:
  enforcementAction: dryrun
  match:
    kinds:
    - apiGroups:
      - configmanagement.gke.io
      kinds:
      - ConfigManagement
Allowed
apiVersion: configmanagement.gke.io/v1
kind: ConfigManagement
metadata:
  annotations:
    configmanagement.gke.io/managed-by-hub: "true"
    configmanagement.gke.io/update-time: "1663586155"
  name: config-management
spec:
  binauthz:
    enabled: true
  clusterName: tec6ea817b5b4bb2-cluster
  enableMultiRepo: true
  git:
    proxy: {}
    syncRepo: git@test-git-server.config-management-system-test:/git-server/repos/sot.git
  hierarchyController: {}
  policyController:
    auditIntervalSeconds: 60
    enabled: true
    monitoring:
      backends:
      - prometheus
      - cloudmonitoring
    mutation: {}
    referentialRulesEnabled: true
    templateLibraryInstalled: true
status:
  configManagementVersion: v1.12.2-rc.2
  healthy: true
Disallowed
apiVersion: configmanagement.gke.io/v1
kind: ConfigManagement
metadata:
  annotations:
    configmanagement.gke.io/managed-by-hub: "true"
    configmanagement.gke.io/update-time: "1663586155"
  name: config-management
spec:
  binauthz:
    enabled: true
  clusterName: tec6ea817b5b4bb2-cluster
  enableMultiRepo: true
  git:
    syncRepo: git@test-git-server.config-management-system-test:/git-server/repos/sot.git
  hierarchyController: {}
  policyController:
    auditIntervalSeconds: 60
    enabled: true
    monitoring:
      backends:
      - prometheus
      - cloudmonitoring
    mutation: {}
    referentialRulesEnabled: true
    templateLibraryInstalled: true
status:
  configManagementVersion: v1.12.2-rc.2

K8sExternalIPs

External IPs v1.0.0

Restricts Service externalIPs to an allowed list of IP addresses. https://kubernetes.io/docs/concepts/services-networking/service/#external-ips

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sExternalIPs
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # allowedIPs <array>: An allow-list of external IP addresses.
    allowedIPs:
      - <string>

Examples

external-ips
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sExternalIPs
metadata:
  name: external-ips
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Service
  parameters:
    allowedIPs:
    - 203.0.113.0
Allowed
apiVersion: v1
kind: Service
metadata:
  name: allowed-external-ip
spec:
  externalIPs:
  - 203.0.113.0
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: MyApp
Disallowed
apiVersion: v1
kind: Service
metadata:
  name: disallowed-external-ip
spec:
  externalIPs:
  - 1.1.1.1
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
  selector:
    app: MyApp

K8sHorizontalPodAutoscaler

Horizontal Pod Autoscaler v1.0.1

Disallow the following scenarios when deploying HorizontalPodAutoscalers 1. Deployment of HorizontalPodAutoscalers with .spec.minReplicas or .spec.maxReplicas outside the ranges defined in the constraint 2. Deployment of HorizontalPodAutoscalers where the difference between .spec.minReplicas and .spec.maxReplicas is less than the configured minimumReplicaSpread 3. Deployment of HorizontalPodAutoscalers that do not reference a valid scaleTargetRef (e.g. Deployment, ReplicationController, ReplicaSet, StatefulSet).

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sHorizontalPodAutoscaler
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # enforceScaleTargetRef <boolean>: If set to true it validates the HPA
    # scaleTargetRef exists
    enforceScaleTargetRef: <boolean>
    # minimumReplicaSpread <integer>: If configured it enforces the minReplicas
    # and maxReplicas in an HPA must have a spread of at least this many
    # replicas
    minimumReplicaSpread: <integer>
    # ranges <array>: Allowed ranges for numbers of replicas.  Values are
    # inclusive.
    ranges:
      # <list item: object>: A range of allowed replicas.  Values are
      # inclusive.
      - # max_replicas <integer>: The maximum number of replicas allowed,
        # inclusive.
        max_replicas: <integer>
        # min_replicas <integer>: The minimum number of replicas allowed,
        # inclusive.
        min_replicas: <integer>

Referential Constraint

This constraint is referential. Prior to use, you must enable referential constraints and create a config that tells Policy Controller what kinds of objects to watch.

Your Policy Controller Config will require a syncOnly entry similar to:

spec:
  sync:
    syncOnly:
      - group: "apps"
        version: "v1"
        kind: "Deployment"
      OR
      - group: "apps"
        version: "v1"
        kind: "StatefulSet"

Examples

horizontal-pod-autoscaler
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sHorizontalPodAutoscaler
metadata:
  name: horizontal-pod-autoscaler
spec:
  enforcementAction: deny
  match:
    kinds:
    - apiGroups:
      - autoscaling
      kinds:
      - HorizontalPodAutoscaler
  parameters:
    enforceScaleTargetRef: true
    minimumReplicaSpread: 1
    ranges:
    - max_replicas: 6
      min_replicas: 3
Allowed
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa-allowed
  namespace: default
spec:
  maxReplicas: 6
  metrics:
  - resource:
      name: cpu
      target:
        averageUtilization: 900
        type: Utilization
    type: Resource
  minReplicas: 3
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-deployment
---
# Referential Data
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx-deployment
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
      example: allowed-deployment
  template:
    metadata:
      labels:
        app: nginx
        example: allowed-deployment
    spec:
      containers:
      - image: nginx:1.14.2
        name: nginx
        ports:
        - containerPort: 80
Disallowed
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa-disallowed-replicas
  namespace: default
spec:
  maxReplicas: 7
  metrics:
  - resource:
      name: cpu
      target:
        averageUtilization: 900
        type: Utilization
    type: Resource
  minReplicas: 2
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-deployment
---
# Referential Data
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx-deployment
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
      example: allowed-deployment
  template:
    metadata:
      labels:
        app: nginx
        example: allowed-deployment
    spec:
      containers:
      - image: nginx:1.14.2
        name: nginx
        ports:
        - containerPort: 80
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa-disallowed-replicaspread
  namespace: default
spec:
  maxReplicas: 4
  metrics:
  - resource:
      name: cpu
      target:
        averageUtilization: 900
        type: Utilization
    type: Resource
  minReplicas: 4
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-deployment
---
# Referential Data
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx-deployment
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
      example: allowed-deployment
  template:
    metadata:
      labels:
        app: nginx
        example: allowed-deployment
    spec:
      containers:
      - image: nginx:1.14.2
        name: nginx
        ports:
        - containerPort: 80
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: nginx-hpa-disallowed-scaletarget
  namespace: default
spec:
  maxReplicas: 6
  metrics:
  - resource:
      name: cpu
      target:
        averageUtilization: 900
        type: Utilization
    type: Resource
  minReplicas: 3
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: nginx-deployment-missing
---
# Referential Data
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: nginx-deployment
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
      example: allowed-deployment
  template:
    metadata:
      labels:
        app: nginx
        example: allowed-deployment
    spec:
      containers:
      - image: nginx:1.14.2
        name: nginx
        ports:
        - containerPort: 80

K8sHttpsOnly

HTTPS Only v1.0.2

Requires Ingress resources to be HTTPS only. Ingress resources must include the kubernetes.io/ingress.allow-http annotation, set to false. By default a valid TLS {} configuration is required, this can be made optional by setting the tlsOptional parameter to true. https://kubernetes.io/docs/concepts/services-networking/ingress/#tls

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sHttpsOnly
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # tlsOptional <boolean>: When set to `true` the TLS {} is optional,
    # defaults to false.
    tlsOptional: <boolean>

Examples

ingress-https-only
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sHttpsOnly
metadata:
  name: ingress-https-only
spec:
  match:
    kinds:
    - apiGroups:
      - extensions
      - networking.k8s.io
      kinds:
      - Ingress
Allowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.allow-http: "false"
  name: ingress-demo-allowed
spec:
  rules:
  - host: example-host.example.com
    http:
      paths:
      - backend:
          service:
            name: nginx
            port:
              number: 80
        path: /
        pathType: Prefix
  tls:
  - {}
Disallowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-demo-disallowed
spec:
  rules:
  - host: example-host.example.com
    http:
      paths:
      - backend:
          service:
            name: nginx
            port:
              number: 80
        path: /
        pathType: Prefix
ingress-https-only-tls-optional
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sHttpsOnly
metadata:
  name: ingress-https-only-tls-optional
spec:
  match:
    kinds:
    - apiGroups:
      - extensions
      - networking.k8s.io
      kinds:
      - Ingress
  parameters:
    tlsOptional: true
Allowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.allow-http: "false"
  name: ingress-demo-allowed-tls-optional
spec:
  rules:
  - host: example-host.example.com
    http:
      paths:
      - backend:
          service:
            name: nginx
            port:
              number: 80
        path: /
        pathType: Prefix
Disallowed
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-demo-disallowed-tls-optional
spec:
  rules:
  - host: example-host.example.com
    http:
      paths:
      - backend:
          service:
            name: nginx
            port:
              number: 80
        path: /
        pathType: Prefix

K8sImageDigests

Image Digests v1.0.1

Requires container images to contain a digest. https://kubernetes.io/docs/concepts/containers/images/

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sImageDigests
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <string>

Examples

container-image-must-have-digest
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sImageDigests
metadata:
  name: container-image-must-have-digest
spec:
  match:
    kinds:
    - apiGroups:
      - ""
      kinds:
      - Pod
    namespaces:
    - default
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: opa-allowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2@sha256:04ff8fce2afd1a3bc26260348e5b290e8d945b1fad4b4c16d22834c2f3a1814a
    name: opa
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
  initContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opainit
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed
spec:
  containers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
  ephemeralContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opa
  initContainers:
  - args:
    - run
    - --server
    - --addr=localhost:8080
    image: openpolicyagent/opa:0.9.2
    name: opainit

K8sLocalStorageRequireSafeToEvict

Local Storage Requires Safe to Evict v1.0.1

Requires Pods using local storage (emptyDir or hostPath) to have the annotation "cluster-autoscaler.kubernetes.io/safe-to-evict": "true". Cluster Autoscaler will not delete Pods without this annotation.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sLocalStorageRequireSafeToEvict
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

local-storage-require-safe-to-evict
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sLocalStorageRequireSafeToEvict
metadata:
  name: local-storage-require-safe-to-evict
spec:
  match:
    excludedNamespaces:
    - kube-system
    - istio-system
    - gatekeeper-system
Allowed
apiVersion: v1
kind: Pod
metadata:
  annotations:
    cluster-autoscaler.kubernetes.io/safe-to-evict: "true"
  name: good-pod
  namespace: default
spec:
  containers:
  - image: redis
    name: redis
    volumeMounts:
    - mountPath: /data/redis
      name: redis-storage
  volumes:
  - emptyDir: {}
    name: redis-storage
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: bad-pod
  namespace: default
spec:
  containers:
  - image: redis
    name: redis
    volumeMounts:
    - mountPath: /data/redis
      name: redis-storage
  volumes:
  - emptyDir: {}
    name: redis-storage

K8sMemoryRequestEqualsLimit

Memory Request Equals Limit v1.0.4

Promotes Pod stability by requiring that all containers' requested memory exactly equals the memory limit, so that Pods are never in a state where memory usage exceeds the requested amount. Otherwise, Kubernetes can terminate Pods requesting extra memory if memory is needed on the node.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sMemoryRequestEqualsLimit
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptContainersRegex <array>: Exempt Container names as regex match.
    exemptContainersRegex:
      - <string>

Examples

container-must-request-limit
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sMemoryRequestEqualsLimit
metadata:
  name: container-must-request-limit
spec:
  match:
    excludedNamespaces:
    - kube-system
    - resource-group-system
    - asm-system
    - istio-system
    - config-management-system
    - config-management-monitoring
  parameters:
    exemptContainersRegex:
    - ^istio-[a-z]+$
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: good-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 4Gi
      requests:
        cpu: 50m
        memory: 4Gi
apiVersion: v1
kind: Pod
metadata:
  name: exempt-pod
  namespace: default
spec:
  containers:
  - image: auto
    name: istio-proxy
    resources:
      limits:
        cpu: 100m
        memory: 4Gi
      requests:
        cpu: 50m
        memory: 2Gi
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: bad-pod
  namespace: default
spec:
  containers:
  - image: nginx
    name: nginx
    resources:
      limits:
        cpu: 100m
        memory: 4Gi
      requests:
        cpu: 50m
        memory: 2Gi

K8sNoEnvVarSecrets

No Environment Variable Secrets v1.0.1

Prohibits secrets as environment variables in Pod container definitions. Use mounted secret files in data volumes instead: https://kubernetes.io/docs/concepts/configuration/secret/#using-secrets-as-files-from-a-pod

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sNoEnvVarSecrets
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]

Examples

no-secrets-as-env-vars-sample
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sNoEnvVarSecrets
metadata:
  name: no-secrets-as-env-vars-sample
spec:
  enforcementAction: dryrun
Allowed
apiVersion: v1
kind: Pod
metadata:
  name: allowed-example
spec:
  containers:
  - image: redis
    name: test
    volumeMounts:
    - mountPath: /etc/test
      name: test
      readOnly: true
  volumes:
  - name: test
    secret:
      secretName: mysecret
Disallowed
apiVersion: v1
kind: Pod
metadata:
  name: disallowed-example
spec:
  containers:
  - env:
    - name: MY_PASSWORD
      valueFrom:
        secretKeyRef:
          key: password
          name: mysecret
    image: redis
    name: test

K8sNoExternalServices

No External Services v1.0.3

Prohibits the creation of known resources that expose workloads to external IPs. This includes Istio Gateway resources and Kubernetes Ingress resources. Kubernetes services are also disallowed unless they meet the following criteria: Any Service of type LoadBalancer in Google Cloud must have a "networking.gke.io/load-balancer-type": "Internal" annotation. Any Service of type LoadBalancer in AWS must have a service.beta.kubernetes.io/aws-load-balancer-internal: "true annotation. Any "external IPs" (external to the cluster) bound to the Service must be a member of a range of internal CIDRs as provided to the constraint.

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sNoExternalServices
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # cloudPlatform <string>: The hosting cloud platform. Only `GCP` and `AWS`
    # are supported currently.
    cloudPlatform: <string>
    # internalCIDRs <array>: A list of CIDRs that are only accessible
    # internally, for example: `10.3.27.0/24`. Which IP ranges are
    # internal-only is determined by the underlying network infrastructure.
    internalCIDRs:
      - <string>

Examples

no-external
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sNoExternalServices
metadata:
  name: no-external
spec:
  parameters:
    internalCIDRs:
    - 10.0.0.1/32
Allowed
apiVersion: v1
kind: Service
metadata:
  name: good-service
  namespace: default
spec:
  externalIPs:
  - 10.0.0.1
  ports:
  - port: 8888
    protocol: TCP
    targetPort: 8888
apiVersion: v1
kind: Service
metadata:
  annotations:
    networking.gke.io/load-balancer-type: Internal
  name: allowed-internal-load-balancer
  namespace: default
spec:
  type: LoadBalancer
Disallowed
apiVersion: v1
kind: Service
metadata:
  name: bad-service
  namespace: default
spec:
  externalIPs:
  - 10.0.0.2
  ports:
  - port: 8888
    protocol: TCP
    targetPort: 8888
no-external-aws
Constraint
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sNoExternalServices
metadata:
  name: no-external-aws
spec:
  parameters:
    cloudPlatform: AWS
Allowed
apiVersion: v1
kind: Service
metadata:
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-internal: "true"
  name: good-aws-service
  namespace: default
spec:
  type: LoadBalancer
Disallowed
apiVersion: v1
kind: Service
metadata:
  annotations:
    cloud.google.com/load-balancer-type: Internal
  name: bad-aws-service
  namespace: default
spec:
  type: LoadBalancer

K8sPSPAllowPrivilegeEscalationContainer

Allow Privilege Escalation in Container v1.0.1

Controls restricting escalation to root privileges. Corresponds to the allowPrivilegeEscalation field in a PodSecurityPolicy. For more information, see https://kubernetes.io/docs/concepts/policy/pod-security-policy/#privilege-escalation

Constraint schema

apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sPSPAllowPrivilegeEscalationContainer
metadata:
  name: example
spec:
  # match <object>: lets you configure which resources are in scope for this
  # constraint. For more information, see the Policy Controller Constraint
  # match documentation:
  # https://cloud.google.com/anthos-config-management/docs/reference/match
  match:
    [match schema]
  parameters:
    # exemptImages <array>: Any container that uses an image that matches an
    # entry in this list will be excluded from enforcement. Prefix-matching can
    # be signified with `*`. For example: `my-image-*`. It is recommended that
    # users use the fully-qualified Docker image name (e.g. start with a domain
    # name) in order to avoid unexpectedly exempting images from an untrusted
    # repository.
    exemptImages:
      - <