rbac.go

package openshift

import (
	rbacv1 "k8s.io/api/rbac/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// BuildClusterRole returns a k8s ClusterRole object for the
// lokistack gateway serviceaccount to allow creating:
// - TokenReviews to authenticate the user by bearer token.
// - SubjectAccessReview to authorize the user by bearer token.
//   if having access to read/create logs.
func BuildClusterRole(opts Options) *rbacv1.ClusterRole {
	return &rbacv1.ClusterRole{
		TypeMeta: metav1.TypeMeta{
			Kind:       "ClusterRole",
			APIVersion: rbacv1.SchemeGroupVersion.String(),
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:   clusterRoleName(opts),
			Labels: opts.BuildOpts.Labels,
		},
		Rules: []rbacv1.PolicyRule{
			{
				APIGroups: []string{
					"authentication.k8s.io",
				},
				Resources: []string{
					"tokenreviews",
				},
				Verbs: []string{
					"create",
				},
			},
			{
				APIGroups: []string{
					"authorization.k8s.io",
				},
				Resources: []string{
					"subjectaccessreviews",
				},
				Verbs: []string{
					"create",
				},
			},
		},
	}
}

// BuildClusterRoleBinding returns a k8s ClusterRoleBinding object for
// the lokistack gateway serviceaccount to grant access to:
// - rbac.authentication.k8s.io/TokenReviews
// - rbac.authorization.k8s.io/SubjectAccessReviews
func BuildClusterRoleBinding(opts Options) *rbacv1.ClusterRoleBinding {
	return &rbacv1.ClusterRoleBinding{
		TypeMeta: metav1.TypeMeta{
			Kind:       "ClusterRoleBinding",
			APIVersion: rbacv1.SchemeGroupVersion.String(),
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:   opts.BuildOpts.GatewayName,
			Labels: opts.BuildOpts.Labels,
		},
		RoleRef: rbacv1.RoleRef{
			APIGroup: "rbac.authorization.k8s.io",
			Kind:     "ClusterRole",
			Name:     clusterRoleName(opts),
		},
		Subjects: []rbacv1.Subject{
			{
				Kind:      rbacv1.ServiceAccountKind,
				Name:      serviceAccountName(opts),
				Namespace: opts.BuildOpts.GatewayNamespace,
			},
		},
	}
}