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Using RBAC to define and apply permissions
- RBAC overview
- Projects and namespaces
- Default projects
- Viewing cluster roles and bindings
- Viewing local roles and bindings
- Adding roles to users
- Creating a local role
- Local role binding commands
- Cluster role binding commands
- Granting
cluster-adminaccess - Granting
dedicated-adminaccess - Cluster role bindings for unauthenticated groups
RBAC overview
Role-based access control (RBAC) objects determine whether a user is allowed to perform a given action within a project.
Administrators with the dedicated-admin role
can use the cluster roles and bindings to control who has various access levels to the Red Hat OpenShift Service on AWS platform itself and all projects.
Developers can use local roles and bindings to control who has access to their projects. Note that authorization is a separate step from authentication, which is more about determining the identity of who is taking the action.
Authorization is managed using:
| Authorization object | Description |
|---|---|
Rules |
Sets of permitted verbs on a set of objects. For example,
whether a user or service account can |
Roles |
Collections of rules. You can associate, or bind, users and groups to multiple roles. |
Bindings |
Associations between users and/or groups with a role. |
There are two levels of RBAC roles and bindings that control authorization:
| RBAC level | Description |
|---|---|
Cluster RBAC |
Roles and bindings that are applicable across all projects. Cluster roles exist cluster-wide, and cluster role bindings can reference only cluster roles. |
Local RBAC |
Roles and bindings that are scoped to a given project. While local roles exist only in a single project, local role bindings can reference both cluster and local roles. |
A cluster role binding is a binding that exists at the cluster level. A role binding exists at the project level. The cluster role view must be bound to a user using a local role binding for that user to view the project. Create local roles only if a cluster role does not provide the set of permissions needed for a particular situation.
This two-level hierarchy allows reuse across multiple projects through the cluster roles while allowing customization inside of individual projects through local roles.
During evaluation, both the cluster role bindings and the local role bindings are used. For example:
-
Cluster-wide "allow" rules are checked.
-
Locally-bound "allow" rules are checked.
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Deny by default.
Default cluster roles
Red Hat OpenShift Service on AWS includes a set of default cluster roles that you can bind to users and groups cluster-wide or locally.
|
It is not recommended to manually modify the default cluster roles. Modifications to these system roles can prevent a cluster from functioning properly. |
| Default cluster role | Description |
|---|---|
|
A project manager. If used in a local binding, an |
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A user that can get basic information about projects and users. |
|
A super-user that can perform any action in any project. When bound to a user with a local binding, they have full control over quota and every action on every resource in the project. |
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A user that can get basic cluster status information. |
|
A user that can get or view most of the objects but cannot modify them. |
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A user that can modify most objects in a project but does not have the power to view or modify roles or bindings. |
|
A user that can create their own projects. |
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A user who cannot make any modifications, but can see most objects in a project. They cannot view or modify roles or bindings. |
Be mindful of the difference between local and cluster bindings. For example,
if you bind the cluster-admin role to a user by using a local role binding,
it might appear that this user has the privileges of a cluster administrator.
This is not the case. Binding the cluster-admin to a user in a project
grants super administrator privileges for only that project to the user. That user has the permissions of the cluster role admin, plus a few additional permissions like the ability to edit rate limits, for that project. This binding can be confusing via the web console UI, which does not list cluster role bindings that are bound to true cluster administrators. However, it does list local role bindings that you can use to locally bind cluster-admin.
The relationships between cluster roles, local roles, cluster role bindings, local role bindings, users, groups and service accounts are illustrated below.
|
The |
Evaluating authorization
Red Hat OpenShift Service on AWS evaluates authorization by using:
- Identity
-
The user name and list of groups that the user belongs to.
- Action
-
The action you perform. In most cases, this consists of:
-
Project: The project you access. A project is a Kubernetes namespace with additional annotations that allows a community of users to organize and manage their content in isolation from other communities.
-
Verb : The action itself:
get,list,create,update,delete,deletecollection, orwatch. -
Resource name: The API endpoint that you access.
-
- Bindings
-
The full list of bindings, the associations between users or groups with a role.
Red Hat OpenShift Service on AWS evaluates authorization by using the following steps:
-
The identity and the project-scoped action is used to find all bindings that apply to the user or their groups.
-
Bindings are used to locate all the roles that apply.
-
Roles are used to find all the rules that apply.
-
The action is checked against each rule to find a match.
-
If no matching rule is found, the action is then denied by default.
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Remember that users and groups can be associated with, or bound to, multiple roles at the same time. |
Project administrators can use the CLI to view local roles and bindings, including a matrix of the verbs and resources each are associated with.
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The cluster role bound to the project administrator is limited in a project through a local binding. It is not bound cluster-wide like the cluster roles granted to the cluster-admin or system:admin. Cluster roles are roles defined at the cluster level but can be bound either at the cluster level or at the project level. |
Cluster role aggregation
The default admin, edit, view, and cluster-reader cluster roles support cluster role aggregation, where the cluster rules for each role are dynamically updated as new rules are created. This feature is relevant only if you extend the Kubernetes API by creating custom resources.
Projects and namespaces
A Kubernetes namespace provides a mechanism to scope resources in a cluster. The Kubernetes documentation has more information on namespaces.
Namespaces provide a unique scope for:
-
Named resources to avoid basic naming collisions.
-
Delegated management authority to trusted users.
-
The ability to limit community resource consumption.
Most objects in the system are scoped by namespace, but some are excepted and have no namespace, including nodes and users.
A project is a Kubernetes namespace with additional annotations and is the central vehicle by which access to resources for regular users is managed. A project allows a community of users to organize and manage their content in isolation from other communities. users must be given access to projects by administrators, or if allowed to create projects, automatically have access to their own projects.
Projects can have a separate name, displayName, and description.
-
The mandatory
nameis a unique identifier for the project and is most visible when using the CLI tools or API. The maximum name length is 63 characters. -
The optional
displayNameis how the project is displayed in the web console (defaults toname). -
The optional
descriptioncan be a more detailed description of the project and is also visible in the web console.
Each project scopes its own set of:
| Object | Description |
|---|---|
|
Pods, services, replication controllers, etc. |
|
Rules for which users can or cannot perform actions on objects. |
|
Quotas for each kind of object that can be limited. |
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Service accounts act automatically with designated access to objects in the project. |
Administrators with the dedicated-admin role
can create projects and delegate administrative rights for the project to any member of the user community.
Administrators with the dedicated-admin role
can also allow developers to create their own projects.
Developers and administrators can interact with projects by using the CLI or the web console.
Default projects
Red Hat OpenShift Service on AWS comes with a number of default projects, and projects
starting with openshift- are the most essential to users.
These projects host master components that run as pods and other infrastructure
components. The pods created in these namespaces that have a
critical pod annotation
are considered critical, and the have guaranteed admission by kubelet.
Pods created for master components in these namespaces are already marked as
critical.
|
Do not run workloads in or share access to default projects. Default projects are reserved for running core cluster components. The following default projects are considered highly privileged: |
Viewing cluster roles and bindings
You can use the oc CLI to view cluster roles and bindings by using the
oc describe command.
Prerequisites
-
Install the
ocCLI. -
Obtain permission to view the cluster roles and bindings.
Procedure
-
To view the cluster roles and their associated rule sets:
$ oc describe clusterrole.rbacExample outputName: admin Labels: kubernetes.io/bootstrapping=rbac-defaults Annotations: rbac.authorization.kubernetes.io/autoupdate: true PolicyRule: Resources Non-Resource URLs Resource Names Verbs --------- ----------------- -------------- ----- .packages.apps.redhat.com [] [] [* create update patch delete get list watch] imagestreams [] [] [create delete deletecollection get list patch update watch create get list watch] imagestreams.image.openshift.io [] [] [create delete deletecollection get list patch update watch create get list watch] secrets [] [] [create delete deletecollection get list patch update watch get list watch create delete deletecollection patch update] buildconfigs/webhooks [] [] [create delete deletecollection get list patch update watch get list watch] buildconfigs [] [] [create delete deletecollection get list patch update watch get list watch] buildlogs [] [] [create delete deletecollection get list patch update watch get list watch] deploymentconfigs/scale [] [] [create delete deletecollection get list patch update watch get list watch] deploymentconfigs [] [] [create delete deletecollection get list patch update watch get list watch] imagestreamimages [] [] [create delete deletecollection get list patch update watch get list watch] imagestreammappings [] [] [create delete deletecollection get list patch update watch get list watch] imagestreamtags [] [] [create delete deletecollection get list patch update watch get list watch] processedtemplates [] [] [create delete deletecollection get list patch update watch get list watch] routes [] [] [create delete deletecollection get list patch update watch get list watch] templateconfigs [] [] [create delete deletecollection get list patch update watch get list watch] templateinstances [] [] [create delete deletecollection get list patch update watch get list watch] templates [] [] [create delete deletecollection get list patch update watch get list watch] deploymentconfigs.apps.openshift.io/scale [] [] [create delete deletecollection get list patch update watch get list watch] deploymentconfigs.apps.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] buildconfigs.build.openshift.io/webhooks [] [] [create delete deletecollection get list patch update watch get list watch] buildconfigs.build.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] buildlogs.build.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] imagestreamimages.image.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] imagestreammappings.image.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] imagestreamtags.image.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] routes.route.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] processedtemplates.template.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] templateconfigs.template.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] templateinstances.template.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] templates.template.openshift.io [] [] [create delete deletecollection get list patch update watch get list watch] serviceaccounts [] [] [create delete deletecollection get list patch update watch impersonate create delete deletecollection patch update get list watch] imagestreams/secrets [] [] [create delete deletecollection get list patch update watch] rolebindings [] [] [create delete deletecollection get list patch update watch] roles [] [] [create delete deletecollection get list patch update watch] rolebindings.authorization.openshift.io [] [] [create delete deletecollection get list patch update watch] roles.authorization.openshift.io [] [] [create delete deletecollection get list patch update watch] imagestreams.image.openshift.io/secrets [] [] [create delete deletecollection get list patch update watch] rolebindings.rbac.authorization.k8s.io [] [] [create delete deletecollection get list patch update watch] roles.rbac.authorization.k8s.io [] [] [create delete deletecollection get list patch update watch] networkpolicies.extensions [] [] [create delete deletecollection patch update create delete deletecollection get list patch update watch get list watch] networkpolicies.networking.k8s.io [] [] [create delete deletecollection patch update create delete deletecollection get list patch update watch get list watch] configmaps [] [] [create delete deletecollection patch update get list watch] endpoints [] [] [create delete deletecollection patch update get list watch] persistentvolumeclaims [] [] [create delete deletecollection patch update get list watch] pods [] [] [create delete deletecollection patch update get list watch] replicationcontrollers/scale [] [] [create delete deletecollection patch update get list watch] replicationcontrollers [] [] [create delete deletecollection patch update get list watch] services [] [] [create delete deletecollection patch update get list watch] daemonsets.apps [] [] [create delete deletecollection patch update get list watch] deployments.apps/scale [] [] [create delete deletecollection patch update get list watch] deployments.apps [] [] [create delete deletecollection patch update get list watch] replicasets.apps/scale [] [] [create delete deletecollection patch update get list watch] replicasets.apps [] [] [create delete deletecollection patch update get list watch] statefulsets.apps/scale [] [] [create delete deletecollection patch update get list watch] statefulsets.apps [] [] [create delete deletecollection patch update get list watch] horizontalpodautoscalers.autoscaling [] [] [create delete deletecollection patch update get list watch] cronjobs.batch [] [] [create delete deletecollection patch update get list watch] jobs.batch [] [] [create delete deletecollection patch update get list watch] daemonsets.extensions [] [] [create delete deletecollection patch update get list watch] deployments.extensions/scale [] [] [create delete deletecollection patch update get list watch] deployments.extensions [] [] [create delete deletecollection patch update get list watch] ingresses.extensions [] [] [create delete deletecollection patch update get list watch] replicasets.extensions/scale [] [] [create delete deletecollection patch update get list watch] replicasets.extensions [] [] [create delete deletecollection patch update get list watch] replicationcontrollers.extensions/scale [] [] [create delete deletecollection patch update get list watch] poddisruptionbudgets.policy [] [] [create delete deletecollection patch update get list watch] deployments.apps/rollback [] [] [create delete deletecollection patch update] deployments.extensions/rollback [] [] [create delete deletecollection patch update] catalogsources.operators.coreos.com [] [] [create update patch delete get list watch] clusterserviceversions.operators.coreos.com [] [] [create update patch delete get list watch] installplans.operators.coreos.com [] [] [create update patch delete get list watch] packagemanifests.operators.coreos.com [] [] [create update patch delete get list watch] subscriptions.operators.coreos.com [] [] [create update patch delete get list watch] buildconfigs/instantiate [] [] [create] buildconfigs/instantiatebinary [] [] [create] builds/clone [] [] [create] deploymentconfigrollbacks [] [] [create] deploymentconfigs/instantiate [] [] [create] deploymentconfigs/rollback [] [] [create] imagestreamimports [] [] [create] localresourceaccessreviews [] [] [create] localsubjectaccessreviews [] [] [create] podsecuritypolicyreviews [] [] [create] podsecuritypolicyselfsubjectreviews [] [] [create] podsecuritypolicysubjectreviews [] [] [create] resourceaccessreviews [] [] [create] routes/custom-host [] [] [create] subjectaccessreviews [] [] [create] subjectrulesreviews [] [] [create] deploymentconfigrollbacks.apps.openshift.io [] [] [create] deploymentconfigs.apps.openshift.io/instantiate [] [] [create] deploymentconfigs.apps.openshift.io/rollback [] [] [create] localsubjectaccessreviews.authorization.k8s.io [] [] [create] localresourceaccessreviews.authorization.openshift.io [] [] [create] localsubjectaccessreviews.authorization.openshift.io [] [] [create] resourceaccessreviews.authorization.openshift.io [] [] [create] subjectaccessreviews.authorization.openshift.io [] [] [create] subjectrulesreviews.authorization.openshift.io [] [] [create] buildconfigs.build.openshift.io/instantiate [] [] [create] buildconfigs.build.openshift.io/instantiatebinary [] [] [create] builds.build.openshift.io/clone [] [] [create] imagestreamimports.image.openshift.io [] [] [create] routes.route.openshift.io/custom-host [] [] [create] podsecuritypolicyreviews.security.openshift.io [] [] [create] podsecuritypolicyselfsubjectreviews.security.openshift.io [] [] [create] podsecuritypolicysubjectreviews.security.openshift.io [] [] [create] jenkins.build.openshift.io [] [] [edit view view admin edit view] builds [] [] [get create delete deletecollection get list patch update watch get list watch] builds.build.openshift.io [] [] [get create delete deletecollection get list patch update watch get list watch] projects [] [] [get delete get delete get patch update] projects.project.openshift.io [] [] [get delete get delete get patch update] namespaces [] [] [get get list watch] pods/attach [] [] [get list watch create delete deletecollection patch update] pods/exec [] [] [get list watch create delete deletecollection patch update] pods/portforward [] [] [get list watch create delete deletecollection patch update] pods/proxy [] [] [get list watch create delete deletecollection patch update] services/proxy [] [] [get list watch create delete deletecollection patch update] routes/status [] [] [get list watch update] routes.route.openshift.io/status [] [] [get list watch update] appliedclusterresourcequotas [] [] [get list watch] bindings [] [] [get list watch] builds/log [] [] [get list watch] deploymentconfigs/log [] [] [get list watch] deploymentconfigs/status [] [] [get list watch] events [] [] [get list watch] imagestreams/status [] [] [get list watch] limitranges [] [] [get list watch] namespaces/status [] [] [get list watch] pods/log [] [] [get list watch] pods/status [] [] [get list watch] replicationcontrollers/status [] [] [get list watch] resourcequotas/status [] [] [get list watch] resourcequotas [] [] [get list watch] resourcequotausages [] [] [get list watch] rolebindingrestrictions [] [] [get list watch] deploymentconfigs.apps.openshift.io/log [] [] [get list watch] deploymentconfigs.apps.openshift.io/status [] [] [get list watch] controllerrevisions.apps [] [] [get list watch] rolebindingrestrictions.authorization.openshift.io [] [] [get list watch] builds.build.openshift.io/log [] [] [get list watch] imagestreams.image.openshift.io/status [] [] [get list watch] appliedclusterresourcequotas.quota.openshift.io [] [] [get list watch] imagestreams/layers [] [] [get update get] imagestreams.image.openshift.io/layers [] [] [get update get] builds/details [] [] [update] builds.build.openshift.io/details [] [] [update] Name: basic-user Labels: <none> Annotations: openshift.io/description: A user that can get basic information about projects. rbac.authorization.kubernetes.io/autoupdate: true PolicyRule: Resources Non-Resource URLs Resource Names Verbs --------- ----------------- -------------- ----- selfsubjectrulesreviews [] [] [create] selfsubjectaccessreviews.authorization.k8s.io [] [] [create] selfsubjectrulesreviews.authorization.openshift.io [] [] [create] clusterroles.rbac.authorization.k8s.io [] [] [get list watch] clusterroles [] [] [get list] clusterroles.authorization.openshift.io [] [] [get list] storageclasses.storage.k8s.io [] [] [get list] users [] [~] [get] users.user.openshift.io [] [~] [get] projects [] [] [list watch] projects.project.openshift.io [] [] [list watch] projectrequests [] [] [list] projectrequests.project.openshift.io [] [] [list] Name: cluster-admin Labels: kubernetes.io/bootstrapping=rbac-defaults Annotations: rbac.authorization.kubernetes.io/autoupdate: true PolicyRule: Resources Non-Resource URLs Resource Names Verbs --------- ----------------- -------------- ----- *.* [] [] [*] [*] [] [*] ... -
To view the current set of cluster role bindings, which shows the users and groups that are bound to various roles:
$ oc describe clusterrolebinding.rbacExample outputName: alertmanager-main Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: alertmanager-main Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount alertmanager-main openshift-monitoring Name: basic-users Labels: <none> Annotations: rbac.authorization.kubernetes.io/autoupdate: true Role: Kind: ClusterRole Name: basic-user Subjects: Kind Name Namespace ---- ---- --------- Group system:authenticated Name: cloud-credential-operator-rolebinding Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: cloud-credential-operator-role Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount default openshift-cloud-credential-operator Name: cluster-admin Labels: kubernetes.io/bootstrapping=rbac-defaults Annotations: rbac.authorization.kubernetes.io/autoupdate: true Role: Kind: ClusterRole Name: cluster-admin Subjects: Kind Name Namespace ---- ---- --------- Group system:masters Name: cluster-admins Labels: <none> Annotations: rbac.authorization.kubernetes.io/autoupdate: true Role: Kind: ClusterRole Name: cluster-admin Subjects: Kind Name Namespace ---- ---- --------- Group system:cluster-admins user system:admin Name: cluster-api-manager-rolebinding Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: cluster-api-manager-role Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount default openshift-machine-api ...
Viewing local roles and bindings
You can use the oc CLI to view local roles and bindings by using the
oc describe command.
Prerequisites
-
Install the
ocCLI. -
Obtain permission to view the local roles and bindings:
-
users with the
admindefault cluster role bound locally can view and manage roles and bindings in that project.
-
Procedure
-
To view the current set of local role bindings, which show the users and groups that are bound to various roles for the current project:
$ oc describe rolebinding.rbac -
To view the local role bindings for a different project, add the
-nflag to the command:$ oc describe rolebinding.rbac -n joe-projectExample outputName: admin Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: admin Subjects: Kind Name Namespace ---- ---- --------- user kube:admin Name: system:deployers Labels: <none> Annotations: openshift.io/description: Allows deploymentconfigs in this namespace to rollout pods in this namespace. It is auto-managed by a controller; remove subjects to disa... Role: Kind: ClusterRole Name: system:deployer Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount deployer joe-project Name: system:image-builders Labels: <none> Annotations: openshift.io/description: Allows builds in this namespace to push images to this namespace. It is auto-managed by a controller; remove subjects to disable. Role: Kind: ClusterRole Name: system:image-builder Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount builder joe-project Name: system:image-pullers Labels: <none> Annotations: openshift.io/description: Allows all pods in this namespace to pull images from this namespace. It is auto-managed by a controller; remove subjects to disable. Role: Kind: ClusterRole Name: system:image-puller Subjects: Kind Name Namespace ---- ---- --------- Group system:serviceaccounts:joe-project
Adding roles to users
You can use the oc adm administrator CLI to manage the roles and bindings.
Binding, or adding, a role to users or groups gives the user or group the access
that is granted by the role. You can add and remove roles to and from users and
groups using oc adm policy commands.
You can bind any of the default cluster roles to local users or groups in your project.
Procedure
-
Add a role to a user in a specific project:
$ oc adm policy add-role-to-user <role> <user> -n <project>For example, you can add the
adminrole to thealiceuser injoeproject by running:$ oc adm policy add-role-to-user admin alice -n joeYou can alternatively apply the following YAML to add the role to the user:
apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: admin-0 namespace: joe roleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: admin subjects: - apiGroup: rbac.authorization.k8s.io kind: user name: alice -
View the local role bindings and verify the addition in the output:
$ oc describe rolebinding.rbac -n <project>For example, to view the local role bindings for the
joeproject:$ oc describe rolebinding.rbac -n joeExample outputName: admin Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: admin Subjects: Kind Name Namespace ---- ---- --------- user kube:admin Name: admin-0 Labels: <none> Annotations: <none> Role: Kind: ClusterRole Name: admin Subjects: Kind Name Namespace ---- ---- --------- user alice (1) Name: system:deployers Labels: <none> Annotations: openshift.io/description: Allows deploymentconfigs in this namespace to rollout pods in this namespace. It is auto-managed by a controller; remove subjects to disa... Role: Kind: ClusterRole Name: system:deployer Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount deployer joe Name: system:image-builders Labels: <none> Annotations: openshift.io/description: Allows builds in this namespace to push images to this namespace. It is auto-managed by a controller; remove subjects to disable. Role: Kind: ClusterRole Name: system:image-builder Subjects: Kind Name Namespace ---- ---- --------- ServiceAccount builder joe Name: system:image-pullers Labels: <none> Annotations: openshift.io/description: Allows all pods in this namespace to pull images from this namespace. It is auto-managed by a controller; remove subjects to disable. Role: Kind: ClusterRole Name: system:image-puller Subjects: Kind Name Namespace ---- ---- --------- Group system:serviceaccounts:joe1 The aliceuser has been added to theadminsRoleBinding.
Creating a local role
You can create a local role for a project and then bind it to a user.
Procedure
-
To create a local role for a project, run the following command:
$ oc create role <name> --verb=<verb> --resource=<resource> -n <project>In this command, specify:
-
<name>, the local role’s name -
<verb>, a comma-separated list of the verbs to apply to the role -
<resource>, the resources that the role applies to -
<project>, the project name
For example, to create a local role that allows a user to view pods in the
blueproject, run the following command:$ oc create role podview --verb=get --resource=pod -n blue -
-
To bind the new role to a user, run the following command:
$ oc adm policy add-role-to-user podview user2 --role-namespace=blue -n blue
Local role binding commands
When you manage a user or group’s associated roles for local role bindings using the
following operations, a project may be specified with the -n flag. If it is
not specified, then the current project is used.
You can use the following commands for local RBAC management.
| Command | Description |
|---|---|
|
Indicates which users can perform an action on a resource. |
|
Binds a specified role to specified users in the current project. |
|
Removes a given role from specified users in the current project. |
|
Removes specified users and all of their roles in the current project. |
|
Binds a given role to specified groups in the current project. |
|
Removes a given role from specified groups in the current project. |
|
Removes specified groups and all of their roles in the current project. |
Cluster role binding commands
You can also manage cluster role bindings using the following
operations. The -n flag is not used for these operations because
cluster role bindings use non-namespaced resources.
| Command | Description |
|---|---|
|
Binds a given role to specified users for all projects in the cluster. |
|
Removes a given role from specified users for all projects in the cluster. |
|
Binds a given role to specified groups for all projects in the cluster. |
|
Removes a given role from specified groups for all projects in the cluster. |
Granting cluster-admin access
As the user who created the cluster, add the cluster-admin user role to your account to have the maximum administrator privileges. These privileges are not automatically assigned to your user account when you create the cluster.
Additionally, only the user who created the cluster can grant cluster access to other cluster-admin or dedicated-admin users. users with dedicated-admin access have fewer privileges. As a best practice, limit the number of cluster-admin users to as few as possible.
Prerequisites
-
You have added an identity provider (IDP) to your cluster.
-
You have the IDP user name for the user you are creating.
-
You are logged in to the cluster.
Procedure
-
Give your user
cluster-adminprivileges:$ rosa grant user cluster-admin --user=<idp_user_name> --cluster=<cluster_name> -
Verify your user is listed as a cluster administrator:
$ rosa list users --cluster=<cluster_name>Example outputGROUP NAME cluster-admins rh-rosa-test-user dedicated-admins rh-rosa-test-user -
Enter the following command to verify that your user now has
cluster-adminaccess. A cluster administrator can run this command without errors, but a dedicated administrator cannot.$ oc get all -n openshift-apiserverExample outputNAME READY STATUS RESTARTS AGE pod/apiserver-6ndg2 1/1 Running 0 17h pod/apiserver-lrmxs 1/1 Running 0 17h pod/apiserver-tsqhz 1/1 Running 0 17h NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/api ClusterIP 172.30.23.241 <none> 443/TCP 18h NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE daemonset.apps/apiserver 3 3 3 3 3 node-role.kubernetes.io/master= 18h
Granting dedicated-admin access
Only the user who created the cluster can grant cluster access to other cluster-admin or dedicated-admin users. users with dedicated-admin access have fewer privileges. As a best practice, grant dedicated-admin access to most of your administrators.
Prerequisites
-
You have added an identity provider (IDP) to your cluster.
-
You have the IDP user name for the user you are creating.
-
You are logged in to the cluster.
Procedure
-
Enter the following command to promote your user to a
dedicated-admin:$ rosa grant user dedicated-admin --user=<idp_user_name> --cluster=<cluster_name> -
Enter the following command to verify that your user now has
dedicated-adminaccess:$ oc get groups dedicated-adminsExample outputNAME userS dedicated-admins rh-rosa-test-userA
Forbiddenerror displays if user withoutdedicated-adminprivileges runs this command.
Cluster role bindings for unauthenticated groups
|
Before Red Hat OpenShift Service on AWS 4.17, unauthenticated groups were allowed access to some cluster roles. Clusters updated from versions before Red Hat OpenShift Service on AWS 4.17 retain this access for unauthenticated groups. |
For security reasons Red Hat OpenShift Service on AWS does not allow unauthenticated groups to have default access to cluster roles.
There are use cases where it might be necessary to add system:unauthenticated to a cluster role.
Cluster administrators can add unauthenticated users to the following cluster roles:
-
system:scope-impersonation -
system:webhook -
system:oauth-token-deleter -
self-access-reviewer
|
Always verify compliance with your organization’s security standards when modifying unauthenticated access. |