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etcdencryption.go
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etcdencryption.go
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package framework
import (
"context"
"crypto"
"crypto/rsa"
"crypto/x509"
_ "embed"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"os"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
jose "github.com/go-jose/go-jose/v3"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/aws/eks-anywhere/internal/pkg/api"
"github.com/aws/eks-anywhere/internal/pkg/s3"
"github.com/aws/eks-anywhere/pkg/api/v1alpha1"
"github.com/aws/eks-anywhere/pkg/constants"
"github.com/aws/eks-anywhere/pkg/templater"
)
const (
irsaS3BucketVar = "T_IRSA_S3_BUCKET"
kmsIAMRoleVar = "T_KMS_IAM_ROLE"
kmsImageVar = "T_KMS_IMAGE"
kmsKeyArn = "T_KMS_KEY_ARN"
kmsKeyRegion = "T_KMS_KEY_REGION"
kmsSocketVar = "T_KMS_SOCKET"
defaultRegion = "us-west-2"
keysFilename = "keys.json"
// SSHKeyPath is the path where the SSH private key is stored on the test-runner instance.
SSHKeyPath = "/tmp/ssh_key"
)
//go:embed config/pod-identity-webhook.yaml
var podIdentityWebhookManifest []byte
//go:embed config/aws-kms-encryption-provider.yaml
var kmsProviderManifest string
type keyResponse struct {
Keys []jose.JSONWebKey `json:"keys"`
}
// etcdEncryptionTestVars stores all the environment variables needed by etcd encryption tests.
type etcdEncryptionTestVars struct {
KmsKeyRegion string
S3Bucket string
KmsIamRole string
KmsImage string
KmsKeyArn string
KmsSocket string
}
// RequiredEtcdEncryptionEnvVars returns the environment variables required .
func RequiredEtcdEncryptionEnvVars() []string {
return []string{irsaS3BucketVar, kmsIAMRoleVar, kmsImageVar, kmsKeyArn, kmsSocketVar}
}
func getEtcdEncryptionVarsFromEnv() *etcdEncryptionTestVars {
return &etcdEncryptionTestVars{
KmsKeyRegion: os.Getenv(kmsKeyRegion),
S3Bucket: os.Getenv(irsaS3BucketVar),
KmsIamRole: os.Getenv(kmsIAMRoleVar),
KmsImage: os.Getenv(kmsImageVar),
KmsKeyArn: os.Getenv(kmsKeyArn),
KmsSocket: os.Getenv(kmsSocketVar),
}
}
// WithPodIamConfig is a ClusterE2ETestOpt that adds pod IAM config to the cluster.
func WithPodIamConfig() ClusterE2ETestOpt {
return func(e *ClusterE2ETest) {
checkRequiredEnvVars(e.T, RequiredEtcdEncryptionEnvVars())
e.clusterFillers = append(e.clusterFillers, api.WithPodIamFiller(getIssuerURL()))
}
}
// WithEtcdEncrytion is a ClusterE2ETestOpt that adds etcd encryption config to the Cluster.
func WithEtcdEncrytion() ClusterE2ETestOpt {
return func(e *ClusterE2ETest) {
checkRequiredEnvVars(e.T, RequiredEtcdEncryptionEnvVars())
encryptionVars := getEtcdEncryptionVarsFromEnv()
kms := &v1alpha1.KMS{
CacheSize: v1alpha1.DefaultKMSCacheSize,
Name: "test-kms-config",
SocketListenAddress: fmt.Sprintf("unix://%s", encryptionVars.KmsSocket),
Timeout: &v1alpha1.DefaultKMSTimeout,
}
e.UpdateClusterConfig(api.ClusterToConfigFiller(api.WithEtcdEncryptionFiller(kms, []string{"secrets"})))
}
}
// ValidateEtcdEncryption validates that etcd encryption is properly configured by creating a secret
// and SSHing into the ETCD nodes and ensuring the secret is not stored in plaintext.
func (e *ClusterE2ETest) ValidateEtcdEncryption() {
ctx := context.Background()
secretName := "my-very-secure-secret"
secretVal := "confidential"
secret := &v1.Secret{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Secret",
},
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: "default",
},
StringData: map[string]string{
"data": secretName,
},
}
if err := e.KubectlClient.Apply(ctx, e.KubeconfigFilePath(), secret); err != nil {
e.T.Fatalf("Error creating secret to validate etcd encryption: %v", err)
}
machines, err := e.KubectlClient.GetCAPIMachines(ctx, e.Cluster(), e.ClusterName)
if err != nil {
e.T.Fatalf("Error getting CAPI machines to validate etcd encryption: %v", err)
}
etcdIPs := make([]string, 0)
for _, m := range machines {
if _, exists := m.Labels["cluster.x-k8s.io/etcd-cluster"]; exists && len(m.Status.Addresses) > 0 {
etcdIPs = append(etcdIPs, m.Status.Addresses[0].Address)
}
}
ssh := buildSSH(e.T)
cmd := []string{
"sudo", "ETCDCTL_API=3", "etcdctl",
"--cacert=/etc/etcd/pki/ca.crt",
"--cert=/etc/etcd/pki/etcdctl-etcd-client.crt",
"--key=/etc/etcd/pki/etcdctl-etcd-client.key",
"get", fmt.Sprintf("/registry/secrets/default/%s", secretName), "| hexdump -C",
}
for _, etcdIP := range etcdIPs {
out, err := ssh.RunCommand(ctx, SSHKeyPath, getSSHUsernameByProvider(e.Provider.Name()), etcdIP, cmd...)
if err != nil {
e.T.Fatalf("Error verifying the secret is encrypted in etcd: %v", err)
}
e.T.Log(out)
if strings.Contains(out, secretVal) && !strings.Contains(out, "k8s:enc:kms:v1") {
e.T.Fatal("The secure secret is not encrypted")
}
e.T.Logf("The secret is encrypted with KMS on etcd node %s", etcdIP)
}
}
func getSSHUsernameByProvider(provider string) string {
switch provider {
case "cloudstack":
return "capc"
case "nutanix":
return "eksa"
default:
return "ec2-user"
}
}
// PostClusterCreateEtcdEncryptionSetup performs operations on the cluster to prepare it for etcd encryption.
// These operations include:
// - Adding Cluster SA cert to the OIDC provider's keys.
// - Deploying Pod Identity Webhook.
// - Deploying AWS KMS Provider.
func (e *ClusterE2ETest) PostClusterCreateEtcdEncryptionSetup() {
ctx := context.Background()
envVars := getEtcdEncryptionVarsFromEnv()
awsSession, err := session.NewSession(&aws.Config{
Region: aws.String(defaultRegion),
})
if err != nil {
e.T.Fatalf("creating aws session for tests: %v", err)
}
if err := e.addClusterCertToIrsaOidcProvider(ctx, envVars, awsSession); err != nil {
e.T.Fatal(err)
}
if err := e.deployPodIdentityWebhook(ctx, envVars); err != nil {
e.T.Fatal(err)
}
if err := e.deployKMSProvider(ctx, envVars); err != nil {
e.T.Fatal(err)
}
}
func getIssuerURL() string {
etcdEncryptionConfig := getEtcdEncryptionVarsFromEnv()
return fmt.Sprintf("https://s3.%s.amazonaws.com/%s", defaultRegion, etcdEncryptionConfig.S3Bucket)
}
func (e *ClusterE2ETest) deployPodIdentityWebhook(ctx context.Context, envVars *etcdEncryptionTestVars) error {
e.T.Log("Deploying Pod Identity Webhook")
if err := e.KubectlClient.ApplyKubeSpecFromBytes(ctx, e.Cluster(), podIdentityWebhookManifest); err != nil {
return fmt.Errorf("deploying pod identity webhook: %v", err)
}
return nil
}
func (e *ClusterE2ETest) deployKMSProvider(ctx context.Context, envVars *etcdEncryptionTestVars) error {
e.T.Log("Deploying AWS KMS Encryption Provider")
values := map[string]string{
"kmsImage": envVars.KmsImage,
"kmsIamRole": envVars.KmsIamRole,
"kmsKeyArn": envVars.KmsKeyArn,
"kmsKeyRegion": envVars.KmsKeyRegion,
"kmsSocket": envVars.KmsSocket,
"serviceAccountName": "kms-encrypter-decrypter",
}
if e.OSFamily != v1alpha1.Bottlerocket {
values["deployOnlyOnControlPlane"] = "true"
}
manifest, err := templater.Execute(kmsProviderManifest, values)
if err != nil {
return fmt.Errorf("templating kms provider manifest: %v", err)
}
if err = e.KubectlClient.ApplyKubeSpecFromBytes(ctx, e.Cluster(), manifest); err != nil {
return fmt.Errorf("deploying kms provider: %v", err)
}
return nil
}
func (e *ClusterE2ETest) addClusterCertToIrsaOidcProvider(ctx context.Context, envVars *etcdEncryptionTestVars, awsSession *session.Session) error {
e.T.Log("Adding Cluster Cert to OIDC keys.json on S3")
// Fetch the cluster's service account cert
saCert, err := e.getClusterSACert(ctx)
if err != nil {
return err
}
// download the current keys json from S3 to add the current cluster's cert
content, err := s3.Download(awsSession, keysFilename, envVars.S3Bucket)
if err != nil {
return fmt.Errorf("downloading %s from s3: %v", keysFilename, err)
}
resp := &keyResponse{}
if err = json.Unmarshal(content, resp); err != nil {
return fmt.Errorf("unmarshaling %s into json: %v", keysFilename, err)
}
newKey, err := getJSONWebKeyFromCertFile(saCert)
if err != nil {
return err
}
resp.Keys = append(resp.Keys, *newKey)
keysJSON, err := json.MarshalIndent(resp, "", " ")
if err != nil {
return fmt.Errorf("marshaling keys.json: %v", err)
}
// upload the modified keys json to s3 with the public read access
if err = s3.Upload(awsSession, keysJSON, keysFilename, envVars.S3Bucket, s3.WithPublicRead()); err != nil {
return fmt.Errorf("upload new keys.json to s3: %v", err)
}
return nil
}
func (e *ClusterE2ETest) getClusterSACert(ctx context.Context) ([]byte, error) {
secret, err := e.KubectlClient.GetSecretFromNamespace(ctx, e.KubeconfigFilePath(), fmt.Sprintf("%s-sa", e.ClusterName), constants.EksaSystemNamespace)
if err != nil {
return nil, err
}
cert, found := secret.Data["tls.crt"]
if !found {
return nil, errors.New("cluster SA secret doesn't contain tls.crt")
}
return cert, nil
}
func getJSONWebKeyFromCertFile(cert []byte) (*jose.JSONWebKey, error) {
block, _ := pem.Decode(cert)
if block == nil {
return nil, errors.New("decoding public key")
}
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("parsing public key content: %v", err)
}
switch pubKey.(type) {
case *rsa.PublicKey:
default:
return nil, errors.New("public key is not RSA")
}
var alg jose.SignatureAlgorithm
switch pubKey.(type) {
case *rsa.PublicKey:
alg = jose.RS256
default:
return nil, fmt.Errorf("invalid public key type %T, must be *rsa.PrivateKey", pubKey)
}
kid, err := keyIDFromPublicKey(pubKey)
if err != nil {
return nil, err
}
return &jose.JSONWebKey{
Key: pubKey,
KeyID: kid,
Algorithm: string(alg),
Use: "sig",
}, nil
}
func keyIDFromPublicKey(publicKey interface{}) (string, error) {
publicKeyDERBytes, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
return "", fmt.Errorf("failed to serialize public key to DER format: %v", err)
}
hasher := crypto.SHA256.New()
hasher.Write(publicKeyDERBytes)
publicKeyDERHash := hasher.Sum(nil)
return base64.RawURLEncoding.EncodeToString(publicKeyDERHash), nil
}