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serviceaccount.go
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serviceaccount.go
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package podsecuritypolicy
import (
"fmt"
"strings"
v13 "github.com/rancher/types/apis/core/v1"
"github.com/rancher/types/apis/extensions/v1beta1"
"github.com/rancher/types/apis/management.cattle.io/v3"
v12 "github.com/rancher/types/apis/rbac.authorization.k8s.io/v1"
"github.com/rancher/types/config"
"github.com/sirupsen/logrus"
"k8s.io/api/core/v1"
v1beta12 "k8s.io/api/extensions/v1beta1"
rbac "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
)
// RegisterServiceAccount ensures that:
// 1. Each namespace has a pod security policy assigned to a role if:
// a. its project has a PSPT assigned to it
// OR
// b. its cluster has a default PSPT assigned to it
// 2. PSPs are bound to their associated service accounts via a cluster role binding
func RegisterServiceAccount(context *config.UserContext) {
logrus.Infof("registering podsecuritypolicy serviceaccount handler for cluster %v", context.ClusterName)
m := &serviceAccountManager{
clusters: context.Management.Management.Clusters(""),
bindings: context.RBAC.RoleBindings(""),
policies: context.Extensions.PodSecurityPolicies(""),
roles: context.RBAC.ClusterRoles(""),
clusterLister: context.Management.Management.Clusters("").Controller().Lister(),
templateLister: context.Management.Management.PodSecurityPolicyTemplates("").Controller().Lister(),
policyLister: context.Extensions.PodSecurityPolicies("").Controller().Lister(),
bindingLister: context.RBAC.RoleBindings("").Controller().Lister(),
roleLister: context.RBAC.ClusterRoles("").Controller().Lister(),
namespaceLister: context.Core.Namespaces("").Controller().Lister(),
projectLister: context.Management.Management.Projects("").Controller().Lister(),
}
context.Core.ServiceAccounts("").AddHandler("ServiceAccountSyncHandler", m.sync)
}
type serviceAccountManager struct {
clusterLister v3.ClusterLister
clusters v3.ClusterInterface
templateLister v3.PodSecurityPolicyTemplateLister
policyLister v1beta1.PodSecurityPolicyLister
bindingLister v12.RoleBindingLister
bindings v12.RoleBindingInterface
policies v1beta1.PodSecurityPolicyInterface
roleLister v12.ClusterRoleLister
roles v12.ClusterRoleInterface
namespaceLister v13.NamespaceLister
projectLister v3.ProjectLister
}
func (m *serviceAccountManager) sync(key string, obj *v1.ServiceAccount) error {
if obj == nil {
logrus.Debugf("no service account provided, exiting")
return nil
}
namespaceName := obj.Namespace
// get PSPT
// if no PSPT then get default
// if no default then exit
namespace, err := m.namespaceLister.Get("", namespaceName)
if err != nil {
return fmt.Errorf("error getting namespaces: %v", err)
}
annotation := namespace.Annotations[projectIDAnnotation]
if annotation == "" {
// no project is associated with namespace so don't do anything
logrus.Debugf("no project is associated with namespace %v", namespaceName)
return nil
}
split := strings.SplitN(annotation, ":", 2)
if len(split) != 2 {
return fmt.Errorf("could not parse handler key: %v got len %v", annotation, len(split))
}
clusterName, projectID := split[0], split[1]
podSecurityPolicyTemplateID, err := getPodSecurityPolicyTemplateID(m.projectLister, m.clusterLister, projectID,
clusterName)
if err != nil {
return err
}
if podSecurityPolicyTemplateID == "" {
// Do nothing
logrus.Debugf("no matching pod security policy template")
return nil
}
policies, err := m.policyLister.List("", labels.Everything())
if err != nil {
return fmt.Errorf("error getting policies: %v", err)
}
var policy *v1beta12.PodSecurityPolicy
for _, candidate := range policies {
if candidate.Annotations[podSecurityTemplateParentAnnotation] == podSecurityPolicyTemplateID {
policy = candidate
}
}
if policy == nil {
template, err := m.templateLister.Get("", podSecurityPolicyTemplateID)
if err != nil {
return fmt.Errorf("error getting pod security policy templates: %v", err)
}
policy, err = fromTemplate(m.policies, m.policyLister, key, template)
if err != nil {
return err
}
}
roles, err := m.roleLister.List("", labels.Everything())
if err != nil {
return fmt.Errorf("error getting cluster roles: %v", err)
}
var role *rbac.ClusterRole
for _, candidate := range roles {
if candidate.Annotations[podSecurityTemplateParentAnnotation] == policy.Name {
role = candidate
}
}
if role == nil {
// Create role
newRole := &rbac.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Annotations: map[string]string{},
GenerateName: "clusterrole-",
Namespace: namespaceName,
},
TypeMeta: metav1.TypeMeta{
Kind: "ClusterRole",
},
Rules: []rbac.PolicyRule{
{
APIGroups: []string{"extensions"},
Resources: []string{"podsecuritypolicies"},
Verbs: []string{"use"},
ResourceNames: []string{policy.Name},
},
},
}
newRole.Annotations[podSecurityTemplateParentAnnotation] = policy.Name
role, err = m.roles.Create(newRole)
if err != nil {
return fmt.Errorf("error creating cluster role: %v", err)
}
}
return createBindingIfNotExists(m.bindings, m.bindingLister, obj, role.Name, policy.Name)
}
func createBindingIfNotExists(bindings2 v12.RoleBindingInterface, bindingLister v12.RoleBindingLister,
serviceAccount *v1.ServiceAccount, roleName string, policyName string) error {
bindings, err := bindingLister.List("", labels.Everything())
if err != nil {
return fmt.Errorf("error getting bindings: %v", err)
}
bindingExists := false
for _, binding := range bindings {
if binding.Annotations[podSecurityTemplateParentAnnotation] == policyName &&
len(binding.Subjects) > 0 && // guard against panic
binding.Subjects[0].Name == serviceAccount.Name &&
binding.Subjects[0].Namespace == serviceAccount.Namespace {
bindingExists = true
}
}
if !bindingExists {
// create binding
err = createBinding(bindings2, serviceAccount, roleName, policyName)
if err != nil {
return err
}
}
return nil
}
func createBinding(bindings v12.RoleBindingInterface, serviceAccount *v1.ServiceAccount, roleName string,
policyName string) error {
newBinding := &rbac.RoleBinding{
ObjectMeta: metav1.ObjectMeta{
Name: fmt.Sprintf("%v-%v-binding", roleName, policyName),
Namespace: serviceAccount.Namespace,
Annotations: map[string]string{
podSecurityTemplateParentAnnotation: policyName,
},
},
TypeMeta: metav1.TypeMeta{
Kind: "ClusterRoleBinding",
},
RoleRef: rbac.RoleRef{
APIGroup: apiGroup,
Name: roleName,
Kind: "ClusterRole",
},
Subjects: []rbac.Subject{
{
Kind: "ServiceAccount",
Name: serviceAccount.Name,
Namespace: serviceAccount.Namespace,
},
},
}
_, err := bindings.Create(newBinding)
if err != nil {
return fmt.Errorf("error creating role binding for %v error was: %v", newBinding, err)
}
return nil
}
func resyncServiceAccounts(serviceAccountLister v13.ServiceAccountLister,
serviceAccountController v13.ServiceAccountController, namespace string) error {
serviceAccounts, err := serviceAccountLister.List(namespace, labels.Everything())
if err != nil {
return fmt.Errorf("error getting service accounts: %v", err)
}
for _, account := range serviceAccounts {
serviceAccountController.Enqueue(account.Namespace, account.Name)
}
return nil
}