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crtb_handler.go
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/
crtb_handler.go
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package auth
import (
"fmt"
"strings"
"github.com/pkg/errors"
"github.com/rancher/types/apis/management.cattle.io/v3"
)
const (
clusterResource = "clusters"
membershipBindingOwner = "memberhsip-binding-owner"
rbByOwnerIndex = "auth.management.cattle.io/rb-by-owner"
rbByRoleAndSubjectIndex = "auth.management.cattle.io/crb-by-role-and-subject"
)
var clusterManagmentPlaneResources = []string{"clusterroletemplatebindings", "nodes", "nodepools", "clusterevents", "projects", "clusterregistrationtokens"}
type crtbLifecycle struct {
mgr *manager
clusterLister v3.ClusterLister
}
func (c *crtbLifecycle) Create(obj *v3.ClusterRoleTemplateBinding) (*v3.ClusterRoleTemplateBinding, error) {
obj, err := c.reconcileSubject(obj)
if err != nil {
return nil, err
}
err = c.reconcilBindings(obj)
return obj, err
}
func (c *crtbLifecycle) Updated(obj *v3.ClusterRoleTemplateBinding) (*v3.ClusterRoleTemplateBinding, error) {
obj, err := c.reconcileSubject(obj)
if err != nil {
return nil, err
}
err = c.reconcilBindings(obj)
return obj, err
}
func (c *crtbLifecycle) Remove(obj *v3.ClusterRoleTemplateBinding) (*v3.ClusterRoleTemplateBinding, error) {
err := c.mgr.reconcileClusterMembershipBindingForDelete("", string(obj.UID))
return nil, err
}
func (c *crtbLifecycle) reconcileSubject(binding *v3.ClusterRoleTemplateBinding) (*v3.ClusterRoleTemplateBinding, error) {
if binding.UserName != "" || binding.GroupName != "" || binding.GroupPrincipalName != "" {
return binding, nil
}
if binding.UserPrincipalName != "" && binding.UserName == "" {
displayName := binding.Annotations["auth.cattle.io/principal-display-name"]
user, err := c.mgr.userMGR.EnsureUser(binding.UserPrincipalName, displayName)
if err != nil {
return binding, err
}
binding.UserName = user.Name
return binding, nil
}
return nil, errors.Errorf("Binding %v has no subject", binding.Name)
}
// When a CRTB is created or updated, translate it into several k8s roles and bindings to actually enforce the RBAC
// Specifically:
// - ensure the subject can see the cluster in the mgmt API
// - if the subject was granted owner permissions for the clsuter, ensure they can create/update/delete the cluster
// - if the subject was granted privileges to mgmt plane resources that are scoped to the cluster, enforce those rules in the cluster's mgmt plane namespace
func (c *crtbLifecycle) reconcilBindings(binding *v3.ClusterRoleTemplateBinding) error {
if binding.UserName == "" && binding.GroupPrincipalName == "" && binding.GroupName == "" {
return nil
}
clusterName := binding.ClusterName
cluster, err := c.clusterLister.Get("", clusterName)
if err != nil {
return err
}
if cluster == nil {
return errors.Errorf("cannot create binding because cluster %v was not found", clusterName)
}
isOwnerRole := binding.RoleTemplateName == "cluster-owner"
var clusterRoleName string
if isOwnerRole {
clusterRoleName = strings.ToLower(fmt.Sprintf("%v-clusterowner", clusterName))
} else {
clusterRoleName = strings.ToLower(fmt.Sprintf("%v-clustermember", clusterName))
}
subject, err := buildSubjectFromRTB(binding)
if err != nil {
return err
}
if err := c.mgr.ensureClusterMembershipBinding(clusterRoleName, string(binding.UID), cluster, isOwnerRole, subject); err != nil {
return err
}
return c.mgr.grantManagementPlanePrivileges(binding.RoleTemplateName, clusterManagmentPlaneResources, subject, binding)
}