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aws.go
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aws.go
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package kms
import (
"fmt"
"hash/fnv"
"path"
"time"
"github.com/openshift/hypershift/control-plane-operator/controllers/hostedcontrolplane/cloud/aws"
"github.com/openshift/hypershift/control-plane-operator/controllers/hostedcontrolplane/manifests"
hyperv1 "github.com/openshift/hypershift/api/hypershift/v1beta1"
"github.com/openshift/hypershift/support/config"
"github.com/openshift/hypershift/support/util"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
v1 "k8s.io/apiserver/pkg/apis/config/v1"
"k8s.io/utils/ptr"
)
const (
activeAWSKMSUnixSocketFileName = "awskmsactive.sock"
activeAWSKMSHealthPort = 8080
backupAWSKMSUnixSocketFileName = "awskmsbackup.sock"
backupAWSKMSHealthPort = 8081
awsKeyNamePrefix = "awskmskey"
)
var (
awsKMSVolumeMounts = util.PodVolumeMounts{
KasMainContainerName: {
kasVolumeKMSSocket().Name: "/var/run",
},
kasContainerAWSKMSActive().Name: {
kasVolumeKMSSocket().Name: "/var/run",
kasVolumeAWSKMSCredentials().Name: "/aws",
kasVolumeAWSKMSCloudProviderToken().Name: "/var/run/secrets/openshift/serviceaccount",
},
kasContainerAWSKMSBackup().Name: {
kasVolumeKMSSocket().Name: "/var/run",
kasVolumeAWSKMSCredentials().Name: "/aws",
kasVolumeAWSKMSCloudProviderToken().Name: "/var/run/secrets/openshift/serviceaccount",
},
kasContainerAWSKMSTokenMinter().Name: {
kasVolumeLocalhostKubeconfig: "/var/secrets/localhost-kubeconfig",
kasVolumeAWSKMSCloudProviderToken().Name: "/var/run/secrets/openshift/serviceaccount",
},
}
backupAWSKMSUnixSocket = fmt.Sprintf("unix://%s/%s", awsKMSVolumeMounts.Path(KasMainContainerName, kasVolumeKMSSocket().Name), backupAWSKMSUnixSocketFileName)
activeAWSKMSUnixSocket = fmt.Sprintf("unix://%s/%s", awsKMSVolumeMounts.Path(KasMainContainerName, kasVolumeKMSSocket().Name), activeAWSKMSUnixSocketFileName)
)
var _ IKMSProvider = &awsKMSProvider{}
type awsKMSProvider struct {
activeKey hyperv1.AWSKMSKeyEntry
backupKey *hyperv1.AWSKMSKeyEntry
awsAuth hyperv1.AWSKMSAuthSpec
awsRegion string
kmsImage string
tokenMinterImage string
}
func NewAWSKMSProvider(kmsSpec *hyperv1.AWSKMSSpec, kmsImage, tokenMinterImage string) (*awsKMSProvider, error) {
if kmsSpec == nil {
return nil, fmt.Errorf("AWS kms metadata not specified")
}
return &awsKMSProvider{
activeKey: kmsSpec.ActiveKey,
backupKey: kmsSpec.BackupKey,
awsAuth: kmsSpec.Auth,
awsRegion: kmsSpec.Region,
kmsImage: kmsImage,
tokenMinterImage: tokenMinterImage,
}, nil
}
func (p *awsKMSProvider) GenerateKMSEncryptionConfig() (*v1.EncryptionConfiguration, error) {
var providerConfiguration []v1.ProviderConfiguration
if len(p.activeKey.ARN) == 0 {
return nil, fmt.Errorf("active key metadata is nil")
}
hasher := fnv.New32()
_, err := hasher.Write([]byte(p.activeKey.ARN))
if err != nil {
return nil, err
}
providerConfiguration = append(providerConfiguration, v1.ProviderConfiguration{
KMS: &v1.KMSConfiguration{
Name: fmt.Sprintf("%s-%d", awsKeyNamePrefix, hasher.Sum32()),
Endpoint: activeAWSKMSUnixSocket,
CacheSize: ptr.To[int32](100),
Timeout: &metav1.Duration{Duration: 35 * time.Second},
},
})
if p.backupKey != nil && len(p.backupKey.ARN) > 0 {
hasher = fnv.New32()
_, err := hasher.Write([]byte(p.backupKey.ARN))
if err != nil {
return nil, err
}
providerConfiguration = append(providerConfiguration, v1.ProviderConfiguration{
KMS: &v1.KMSConfiguration{
Name: fmt.Sprintf("%s-%d", awsKeyNamePrefix, hasher.Sum32()),
Endpoint: backupAWSKMSUnixSocket,
CacheSize: ptr.To[int32](100),
Timeout: &metav1.Duration{Duration: 35 * time.Second},
},
})
}
providerConfiguration = append(providerConfiguration, v1.ProviderConfiguration{
Identity: &v1.IdentityConfiguration{},
})
encryptionConfig := &v1.EncryptionConfiguration{
TypeMeta: metav1.TypeMeta{
APIVersion: v1.SchemeGroupVersion.String(),
Kind: encryptionConfigurationKind,
},
Resources: []v1.ResourceConfiguration{
{
Resources: config.KMSEncryptedObjects(),
Providers: providerConfiguration,
},
},
}
return encryptionConfig, nil
}
func (p *awsKMSProvider) ApplyKMSConfig(podSpec *corev1.PodSpec) error {
if len(p.activeKey.ARN) == 0 || len(p.kmsImage) == 0 {
return fmt.Errorf("aws kms active key metadata is nil")
}
podSpec.Containers = append(podSpec.Containers, util.BuildContainer(kasContainerAWSKMSTokenMinter(), buildKASContainerAWSKMSTokenMinter(p.tokenMinterImage)))
podSpec.Containers = append(podSpec.Containers, util.BuildContainer(kasContainerAWSKMSActive(), buildKASContainerAWSKMS(p.kmsImage, p.activeKey.ARN, p.awsRegion, fmt.Sprintf("%s/%s", awsKMSVolumeMounts.Path(KasMainContainerName, kasVolumeKMSSocket().Name), activeAWSKMSUnixSocketFileName), activeAWSKMSHealthPort)))
if p.backupKey != nil && len(p.backupKey.ARN) > 0 {
podSpec.Containers = append(podSpec.Containers, util.BuildContainer(kasContainerAWSKMSBackup(), buildKASContainerAWSKMS(p.kmsImage, p.backupKey.ARN, p.awsRegion, fmt.Sprintf("%s/%s", awsKMSVolumeMounts.Path(KasMainContainerName, kasVolumeKMSSocket().Name), backupAWSKMSUnixSocketFileName), backupAWSKMSHealthPort)))
}
if len(p.awsAuth.AWSKMSRoleARN) == 0 {
return fmt.Errorf("aws kms role arn not specified")
}
podSpec.Volumes = append(podSpec.Volumes,
util.BuildVolume(kasVolumeAWSKMSCredentials(), buildVolumeAWSKMSCredentials(aws.AWSKMSCredsSecret("").Name)),
util.BuildVolume(kasVolumeKMSSocket(), buildVolumeKMSSocket),
util.BuildVolume(kasVolumeAWSKMSCloudProviderToken(), buildKASVolumeAWSKMSCloudProviderToken),
)
var container *corev1.Container
for i, c := range podSpec.Containers {
if c.Name == KasMainContainerName {
container = &podSpec.Containers[i]
break
}
}
if container == nil {
panic("main kube apiserver container not found in spec")
}
container.VolumeMounts = append(container.VolumeMounts,
awsKMSVolumeMounts.ContainerMounts(KasMainContainerName)...)
return nil
}
func kasContainerAWSKMSActive() *corev1.Container {
return &corev1.Container{
Name: "aws-kms-active",
}
}
func kasContainerAWSKMSBackup() *corev1.Container {
return &corev1.Container{
Name: "aws-kms-backup",
}
}
func kasContainerAWSKMSTokenMinter() *corev1.Container {
return &corev1.Container{
Name: "aws-kms-token-minter",
}
}
func buildKASContainerAWSKMS(image string, arn string, region string, unixSocketPath string, healthPort int) func(c *corev1.Container) {
return func(c *corev1.Container) {
c.Image = image
c.ImagePullPolicy = corev1.PullIfNotPresent
c.Ports = []corev1.ContainerPort{
{
Name: "http",
ContainerPort: int32(healthPort),
Protocol: corev1.ProtocolTCP,
},
}
c.Env = append(c.Env,
corev1.EnvVar{
Name: "AWS_SHARED_CREDENTIALS_FILE",
Value: path.Join(awsKMSVolumeMounts.Path(c.Name, kasVolumeAWSKMSCredentials().Name), hyperv1.AWSCredentialsFileSecretKey),
},
corev1.EnvVar{
Name: "AWS_SDK_LOAD_CONFIG",
Value: "true",
},
corev1.EnvVar{
Name: "AWS_EC2_METADATA_DISABLED",
Value: "true",
})
c.Args = []string{
fmt.Sprintf("--key=%s", arn),
fmt.Sprintf("--region=%s", region),
fmt.Sprintf("--listen=%s", unixSocketPath),
fmt.Sprintf("--health-port=:%d", healthPort),
}
c.VolumeMounts = awsKMSVolumeMounts.ContainerMounts(c.Name)
c.LivenessProbe = &corev1.Probe{
ProbeHandler: corev1.ProbeHandler{
HTTPGet: &corev1.HTTPGetAction{
Scheme: corev1.URISchemeHTTP,
Port: intstr.FromInt(healthPort),
Path: "healthz",
},
},
InitialDelaySeconds: 120,
PeriodSeconds: 300,
TimeoutSeconds: 160,
FailureThreshold: 3,
SuccessThreshold: 1,
}
c.Resources = corev1.ResourceRequirements{
Requests: corev1.ResourceList{
corev1.ResourceMemory: resource.MustParse("10Mi"),
corev1.ResourceCPU: resource.MustParse("10m"),
},
}
}
}
func kasVolumeAWSKMSCredentials() *corev1.Volume {
return &corev1.Volume{
Name: "aws-kms-credentials",
}
}
func buildVolumeAWSKMSCredentials(secretName string) func(*corev1.Volume) {
return func(v *corev1.Volume) {
v.Secret = &corev1.SecretVolumeSource{}
v.Secret.SecretName = secretName
}
}
func buildKASContainerAWSKMSTokenMinter(image string) func(*corev1.Container) {
return func(c *corev1.Container) {
c.Image = image
c.ImagePullPolicy = corev1.PullIfNotPresent
c.Command = []string{"/usr/bin/control-plane-operator", "token-minter"}
c.Args = []string{
"--token-audience=openshift",
fmt.Sprintf("--service-account-namespace=%s", manifests.KASContainerAWSKMSProviderServiceAccount().Namespace),
fmt.Sprintf("--service-account-name=%s", manifests.KASContainerAWSKMSProviderServiceAccount().Name),
fmt.Sprintf("--token-file=%s", path.Join(awsKMSVolumeMounts.Path(c.Name, kasVolumeAWSKMSCloudProviderToken().Name), "token")),
fmt.Sprintf("--kubeconfig=%s", path.Join(awsKMSVolumeMounts.Path(c.Name, kasVolumeLocalhostKubeconfig), util.KubeconfigKey)),
}
c.Resources.Requests = corev1.ResourceList{
corev1.ResourceCPU: resource.MustParse("10m"),
corev1.ResourceMemory: resource.MustParse("10Mi"),
}
c.VolumeMounts = awsKMSVolumeMounts.ContainerMounts(c.Name)
}
}
func kasVolumeAWSKMSCloudProviderToken() *corev1.Volume {
return &corev1.Volume{
Name: "aws-kms-token",
}
}
func buildKASVolumeAWSKMSCloudProviderToken(v *corev1.Volume) {
v.EmptyDir = &corev1.EmptyDirVolumeSource{Medium: corev1.StorageMediumMemory}
}