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identity.go
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identity.go
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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package scope
import (
"context"
"fmt"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/adal"
"github.com/pkg/errors"
infrav1 "sigs.k8s.io/cluster-api-provider-azure/api/v1alpha3"
"sigs.k8s.io/cluster-api-provider-azure/util/identity"
clusterv1 "sigs.k8s.io/cluster-api/api/v1alpha3"
clusterctl "sigs.k8s.io/cluster-api/cmd/clusterctl/api/v1alpha3"
"sigs.k8s.io/controller-runtime/pkg/client"
aadpodv1 "github.com/Azure/aad-pod-identity/pkg/apis/aadpodidentity/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// AzureCredentialsProvider provides
type AzureCredentialsProvider struct {
Client client.Client
AzureCluster *infrav1.AzureCluster
Identity *infrav1.AzureClusterIdentity
}
// NewAzureCredentialsProvider creates a new AzureCredentialsProvider from the supplied inputs.
func NewAzureCredentialsProvider(ctx context.Context, kubeClient client.Client, azureCluster *infrav1.AzureCluster) (*AzureCredentialsProvider, error) {
if azureCluster.Spec.IdentityRef == nil {
return nil, errors.New("failed to generate new AzureCredentialsProvider from empty identityName")
}
ref := azureCluster.Spec.IdentityRef
// if the namespace isn't specified then assume it's in the same namespace as the AzureCluster
namespace := ref.Namespace
if namespace == "" {
namespace = azureCluster.Namespace
}
identity := &infrav1.AzureClusterIdentity{}
key := client.ObjectKey{Name: ref.Name, Namespace: namespace}
if err := kubeClient.Get(ctx, key, identity); err != nil {
return nil, errors.Errorf("failed to retrieve AzureClusterIdentity external object %q/%q: %v", key.Namespace, key.Name, err)
}
if identity.Spec.Type != infrav1.ServicePrincipal {
return nil, errors.New("AzureClusterIdentity is not of type Service Principal")
}
return &AzureCredentialsProvider{
Client: kubeClient,
AzureCluster: azureCluster,
Identity: identity,
}, nil
}
// GetAuthorizer returns an Azure authorizer based on the provided azure identity
func (p *AzureCredentialsProvider) GetAuthorizer(ctx context.Context, resourceManagerEndpoint string) (autorest.Authorizer, error) {
azureIdentityType, err := getAzureIdentityType(p.Identity)
if err != nil {
return nil, err
}
copiedIdentity := &aadpodv1.AzureIdentity{
TypeMeta: metav1.TypeMeta{
Kind: "AzureIdentity",
APIVersion: "aadpodidentity.k8s.io/v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: identity.GetAzureIdentityName(p.AzureCluster.Name, p.AzureCluster.Namespace, p.Identity.Name),
Namespace: infrav1.ControllerNamespace,
Annotations: map[string]string{
aadpodv1.BehaviorKey: "namespaced",
},
Labels: map[string]string{
clusterv1.ClusterLabelName: p.AzureCluster.Name,
infrav1.ClusterLabelNamespace: p.AzureCluster.Namespace,
clusterctl.ClusterctlMoveLabelName: "true",
},
OwnerReferences: p.AzureCluster.OwnerReferences,
},
Spec: aadpodv1.AzureIdentitySpec{
Type: azureIdentityType,
TenantID: p.Identity.Spec.TenantID,
ClientID: p.Identity.Spec.ClientID,
ClientPassword: p.Identity.Spec.ClientSecret,
ResourceID: p.Identity.Spec.ResourceID,
},
}
err = p.Client.Create(ctx, copiedIdentity)
if err != nil && !apierrors.IsAlreadyExists(err) {
return nil, errors.Errorf("failed to create copied AzureIdentity %s in %s: %v", copiedIdentity.Name, infrav1.ControllerNamespace, err)
}
azureIdentityBinding := &aadpodv1.AzureIdentityBinding{
TypeMeta: metav1.TypeMeta{
Kind: "AzureIdentityBinding",
APIVersion: "aadpodidentity.k8s.io/v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: fmt.Sprintf("%s-binding", copiedIdentity.Name),
Namespace: copiedIdentity.Namespace,
Labels: map[string]string{
clusterv1.ClusterLabelName: p.AzureCluster.Name,
infrav1.ClusterLabelNamespace: p.AzureCluster.Namespace,
clusterctl.ClusterctlMoveLabelName: "true",
},
OwnerReferences: p.AzureCluster.OwnerReferences,
},
Spec: aadpodv1.AzureIdentityBindingSpec{
AzureIdentity: copiedIdentity.Name,
Selector: infrav1.AzureIdentityBindingSelector, //should be same as selector added on controller
},
}
err = p.Client.Create(ctx, azureIdentityBinding)
if err != nil && !apierrors.IsAlreadyExists(err) {
return nil, errors.Errorf("failed to create AzureIdentityBinding %s in %s: %v", copiedIdentity.Name, infrav1.ControllerNamespace, err)
}
var spt *adal.ServicePrincipalToken
msiEndpoint, err := adal.GetMSIVMEndpoint()
if err != nil {
return nil, errors.Errorf("failed to get MSI endpoint: %v", err)
}
if p.Identity.Spec.Type == infrav1.ServicePrincipal {
spt, err = adal.NewServicePrincipalTokenFromMSIWithUserAssignedID(msiEndpoint, resourceManagerEndpoint, p.Identity.Spec.ClientID)
if err != nil {
return nil, errors.Errorf("failed to get token from service principal identity: %v", err)
}
} else if p.Identity.Spec.Type == infrav1.UserAssignedMSI {
return nil, errors.Errorf("UserAssignedMSI not supported: %v", err)
}
return autorest.NewBearerAuthorizer(spt), nil
}
func getAzureIdentityType(identity *infrav1.AzureClusterIdentity) (aadpodv1.IdentityType, error) {
switch identity.Spec.Type {
case infrav1.ServicePrincipal:
return aadpodv1.ServicePrincipal, nil
case infrav1.UserAssignedMSI:
return aadpodv1.UserAssignedMSI, nil
}
return 0, errors.New("AzureIdentity does not have a vaild type")
}