/
tls.go
277 lines (248 loc) · 8.04 KB
/
tls.go
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package vault
import (
"crypto/rsa"
"crypto/x509"
"fmt"
api "github.com/operator-framework/operator-sdk-samples/vault-operator/pkg/apis/vault/v1alpha1"
"github.com/operator-framework/operator-sdk-samples/vault-operator/pkg/tls"
"github.com/operator-framework/operator-sdk/pkg/sdk"
"k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
var (
defaultClusterDomain = "cluster.local"
orgForTLSCert = []string{"coreos.com"}
)
// prepareDefaultVaultTLSSecrets creates the default secrets for the vault server's TLS assets.
// Currently we self-generate the CA, and use the self generated CA to sign all the TLS certs.
func prepareDefaultVaultTLSSecrets(vr *api.VaultService) (err error) {
defer func() {
if err != nil {
err = fmt.Errorf("prepare default vault TLS secrets failed: %v", err)
}
}()
// if TLS spec doesn't exist or secrets doesn't exist, then we can go create secrets.
if api.IsTLSConfigured(vr.Spec.TLS) {
se := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: vr.Spec.TLS.Static.ServerSecret,
Namespace: vr.Namespace,
},
}
err = sdk.Get(se)
if err == nil {
return nil
}
if !apierrors.IsNotFound(err) {
return err
}
}
caKey, caCrt, err := newCACert()
if err != nil {
return err
}
se, err := newVaultServerTLSSecret(vr, caKey, caCrt)
if err != nil {
return err
}
addOwnerRefToObject(se, asOwner(vr))
err = sdk.Create(se)
if err != nil && !apierrors.IsAlreadyExists(err) {
return err
}
se = newVaultClientTLSSecret(vr, caCrt)
addOwnerRefToObject(se, asOwner(vr))
err = sdk.Create(se)
if err != nil && !apierrors.IsAlreadyExists(err) {
return err
}
return nil
}
// newVaultServerTLSSecret returns a secret containing vault server TLS assets
func newVaultServerTLSSecret(vr *api.VaultService, caKey *rsa.PrivateKey, caCrt *x509.Certificate) (*v1.Secret, error) {
return newTLSSecret(vr, caKey, caCrt, "vault server", api.DefaultVaultServerTLSSecretName(vr.Name),
[]string{
"localhost",
fmt.Sprintf("*.%s.pod", vr.Namespace),
fmt.Sprintf("%s.%s.svc", vr.Name, vr.Namespace),
},
map[string]string{
"key": "server.key",
"cert": "server.crt",
// The CA is not used by the server
"ca": "server-ca.crt",
})
}
// newVaultClientTLSSecret returns a secret containing vault client TLS assets.
// The client key and certificate are not generated since clients are not authenticated at the server
func newVaultClientTLSSecret(vr *api.VaultService, caCrt *x509.Certificate) *v1.Secret {
return &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: api.DefaultVaultClientTLSSecretName(vr.Name),
Namespace: vr.Namespace,
Labels: LabelsForVault(vr.Name),
},
Data: map[string][]byte{
api.CATLSCertName: tls.EncodeCertificatePEM(caCrt),
},
}
}
// prepareEtcdTLSSecrets creates three etcd TLS secrets (client, server, peer) containing TLS assets.
// Currently we self-generate the CA, and use the self generated CA to sign all the TLS certs.
func prepareEtcdTLSSecrets(vr *api.VaultService) (err error) {
defer func() {
if err != nil {
err = fmt.Errorf("prepare TLS secrets failed: %v", err)
}
}()
se := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: EtcdClientTLSSecretName(vr.Name),
Namespace: vr.Namespace,
},
}
err = sdk.Get(se)
if err == nil {
return nil
}
if !apierrors.IsNotFound(err) {
return err
}
caKey, caCrt, err := newCACert()
if err != nil {
return err
}
se, err = newEtcdClientTLSSecret(vr, caKey, caCrt)
if err != nil {
return err
}
addOwnerRefToObject(se, asOwner(vr))
err = sdk.Create(se)
if err != nil && !apierrors.IsAlreadyExists(err) {
return err
}
se, err = newEtcdServerTLSSecret(vr, caKey, caCrt)
if err != nil {
return err
}
addOwnerRefToObject(se, asOwner(vr))
err = sdk.Create(se)
if err != nil && !apierrors.IsAlreadyExists(err) {
return err
}
se, err = newEtcdPeerTLSSecret(vr, caKey, caCrt)
if err != nil {
return err
}
addOwnerRefToObject(se, asOwner(vr))
err = sdk.Create(se)
if err != nil && !apierrors.IsAlreadyExists(err) {
return err
}
return nil
}
func newCACert() (*rsa.PrivateKey, *x509.Certificate, error) {
key, err := tls.NewPrivateKey()
if err != nil {
return nil, nil, err
}
config := tls.CertConfig{
CommonName: "vault operator CA",
Organization: orgForTLSCert,
}
cert, err := tls.NewSelfSignedCACertificate(config, key)
if err != nil {
return nil, nil, err
}
return key, cert, err
}
// newEtcdClientTLSSecret returns a secret containing etcd client TLS assets
func newEtcdClientTLSSecret(vr *api.VaultService, caKey *rsa.PrivateKey, caCrt *x509.Certificate) (*v1.Secret, error) {
return newTLSSecret(vr, caKey, caCrt, "etcd client", EtcdClientTLSSecretName(vr.Name), nil,
map[string]string{
"key": "etcd-client.key",
"cert": "etcd-client.crt",
"ca": "etcd-client-ca.crt",
})
}
// newEtcdPeerTLSSecret returns a secret containing etcd peer TLS assets
func newEtcdPeerTLSSecret(vr *api.VaultService, caKey *rsa.PrivateKey, caCrt *x509.Certificate) (*v1.Secret, error) {
return newTLSSecret(vr, caKey, caCrt, "etcd peer", etcdPeerTLSSecretName(vr.Name),
[]string{
fmt.Sprintf("*.%s.%s.svc", EtcdNameForVault(vr.Name), vr.Namespace),
fmt.Sprintf("*.%s.%s.svc.%s", EtcdNameForVault(vr.Name), vr.Namespace, defaultClusterDomain),
},
map[string]string{
"key": "peer.key",
"cert": "peer.crt",
"ca": "peer-ca.crt",
})
}
// newTLSSecret is a common utility for creating a secret containing TLS assets.
func newTLSSecret(vr *api.VaultService, caKey *rsa.PrivateKey, caCrt *x509.Certificate, commonName, secretName string,
addrs []string, fieldMap map[string]string) (*v1.Secret, error) {
tc := tls.CertConfig{
CommonName: commonName,
Organization: orgForTLSCert,
AltNames: tls.NewAltNames(addrs),
}
key, crt, err := newKeyAndCert(caCrt, caKey, tc)
if err != nil {
return nil, fmt.Errorf("new TLS secret failed: %v", err)
}
secret := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: vr.Namespace,
Labels: LabelsForVault(vr.Name),
},
Data: map[string][]byte{
fieldMap["key"]: tls.EncodePrivateKeyPEM(key),
fieldMap["cert"]: tls.EncodeCertificatePEM(crt),
fieldMap["ca"]: tls.EncodeCertificatePEM(caCrt),
},
}
return secret, nil
}
func newKeyAndCert(caCert *x509.Certificate, caPrivKey *rsa.PrivateKey, config tls.CertConfig) (*rsa.PrivateKey, *x509.Certificate, error) {
key, err := tls.NewPrivateKey()
if err != nil {
return nil, nil, err
}
cert, err := tls.NewSignedCertificate(config, key, caCert, caPrivKey)
if err != nil {
return nil, nil, err
}
return key, cert, nil
}
// newEtcdServerTLSSecret returns a secret containing etcd server TLS assets
func newEtcdServerTLSSecret(vr *api.VaultService, caKey *rsa.PrivateKey, caCrt *x509.Certificate) (*v1.Secret, error) {
return newTLSSecret(vr, caKey, caCrt, "etcd server", etcdServerTLSSecretName(vr.Name),
[]string{
"localhost",
fmt.Sprintf("*.%s.%s.svc", EtcdNameForVault(vr.Name), vr.Namespace),
fmt.Sprintf("%s-client", EtcdNameForVault(vr.Name)),
fmt.Sprintf("%s-client.%s", EtcdNameForVault(vr.Name), vr.Namespace),
fmt.Sprintf("%s-client.%s.svc", EtcdNameForVault(vr.Name), vr.Namespace),
fmt.Sprintf("*.%s.%s.svc.%s", EtcdNameForVault(vr.Name), vr.Namespace, defaultClusterDomain),
fmt.Sprintf("%s-client.%s.svc.%s", EtcdNameForVault(vr.Name), vr.Namespace, defaultClusterDomain),
},
map[string]string{
"key": "server.key",
"cert": "server.crt",
"ca": "server-ca.crt",
})
}
// etcdClientTLSSecretName returns the name of etcd client TLS secret for the given vault name
func EtcdClientTLSSecretName(vaultName string) string {
return vaultName + "-etcd-client-tls"
}
// etcdServerTLSSecretName returns the name of etcd server TLS secret for the given vault name
func etcdServerTLSSecretName(vaultName string) string {
return vaultName + "-etcd-server-tls"
}
// etcdPeerTLSSecretName returns the name of etcd peer TLS secret for the given vault name
func etcdPeerTLSSecretName(vaultName string) string {
return vaultName + "-etcd-peer-tls"
}