/
credentials.go
257 lines (237 loc) · 8.08 KB
/
credentials.go
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package credentials
import (
"context"
"crypto/rand"
"fmt"
"math/big"
"golang.org/x/crypto/bcrypt"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
lca_api "github.com/openshift-kni/lifecycle-agent/api/seedreconfig"
hivev1 "github.com/openshift/hive/apis/hive/v1"
"github.com/openshift/image-based-install-operator/internal/certs"
"github.com/sirupsen/logrus"
)
const (
DefaultUser = "kubeadmin"
kubeconfig = "kubeconfig"
kubeadmincreds = "kubeadmincreds"
)
type Credentials struct {
client.Client
Certs certs.KubeConfigCertManager
Log logrus.FieldLogger
Scheme *runtime.Scheme
}
func (r *Credentials) EnsureKubeconfigSecret(ctx context.Context, cd *hivev1.ClusterDeployment, clusterInfo *lca_api.SeedReconfiguration) (lca_api.KubeConfigCryptoRetention, error) {
existsAndValid, err := r.kubeconfigExistsAndValid(ctx, cd, clusterInfo)
if err != nil {
return lca_api.KubeConfigCryptoRetention{}, err
}
if existsAndValid {
return clusterInfo.KubeconfigCryptoRetention, nil
}
// Generate cluster certs and create a new kubeconfig.
// TODO: handle user provided API and ingress certs
r.Log.Infof("Generating cluster crypto")
if err := r.Certs.GenerateAllCertificates(); err != nil {
return lca_api.KubeConfigCryptoRetention{}, fmt.Errorf("failed to generate certificates: %w", err)
}
kubeconfigBytes, err := generateKubeConfig(fmt.Sprintf("%s.%s", cd.Spec.ClusterName, cd.Spec.BaseDomain),
r.Certs.GetCertificateAuthData(),
r.Certs.GetClientCert(),
r.Certs.GetClientKey())
if err != nil {
return lca_api.KubeConfigCryptoRetention{}, fmt.Errorf("failed to generate kubeconfig: %w", err)
}
data := map[string][]byte{
"kubeconfig": kubeconfigBytes,
}
if err := r.createOrUpdateClusterCredentialSecret(ctx, cd, KubeconfigSecretName(cd.Name), data, kubeconfig); err != nil {
return lca_api.KubeConfigCryptoRetention{}, fmt.Errorf("failed to create kubeadmin password secret: %w", err)
}
return r.Certs.GetCrypto(), nil
}
func (r *Credentials) EnsureAdminPasswordSecret(ctx context.Context, cd *hivev1.ClusterDeployment) (string, error) {
secretRef := types.NamespacedName{Namespace: cd.Namespace, Name: KubeadminPasswordSecretName(cd.Name)}
secret := &corev1.Secret{}
err := r.Get(ctx, secretRef, secret)
if err == nil {
password, exists := secret.Data["password"]
if !exists {
r.Log.Warn("failed to find password in secret, generating new one")
} else {
passwordHash, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
if err != nil {
return "", fmt.Errorf("failed to generate password hash: %w", err)
}
return string(passwordHash), nil
}
} else if !errors.IsNotFound(err) {
return "", fmt.Errorf("failed to get kubeadmin password secret: %w", err)
}
r.Log.Infof("Generating admin password")
password, err := generateKubeadminPassword()
if err != nil {
return "", fmt.Errorf("failed to generate password: %w", err)
}
data := map[string][]byte{
"username": []byte(DefaultUser),
"password": []byte(password),
}
if err := r.createOrUpdateClusterCredentialSecret(ctx, cd, KubeadminPasswordSecretName(cd.Name), data, kubeadmincreds); err != nil {
return "", fmt.Errorf("failed to create kubeadmin password secret: %w", err)
}
passwordHash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
if err != nil {
return "", fmt.Errorf("failed to generate password hash: %w", err)
}
return string(passwordHash), nil
}
func (r *Credentials) createOrUpdateClusterCredentialSecret(ctx context.Context, cd *hivev1.ClusterDeployment, name string, data map[string][]byte, secretType string) error {
secret := &corev1.Secret{
TypeMeta: metav1.TypeMeta{
Kind: "Secret",
APIVersion: corev1.SchemeGroupVersion.String(),
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: cd.Namespace,
},
Data: data,
Type: corev1.SecretTypeOpaque,
}
secret.Labels = addLabel(secret.Labels, "hive.openshift.io/cluster-deployment-name", cd.Name)
secret.Labels = addLabel(secret.Labels, "hive.openshift.io/secret-type", secretType)
deploymentGVK, err := apiutil.GVKForObject(cd, r.Scheme)
if err != nil {
r.Log.WithError(err).Errorf("error getting GVK for clusterdeployment")
return err
}
secret.OwnerReferences = []metav1.OwnerReference{{
APIVersion: deploymentGVK.GroupVersion().String(),
Kind: deploymentGVK.Kind,
Name: cd.Name,
UID: cd.UID,
BlockOwnerDeletion: ptr.To(true),
}}
mutateFn := func() error {
// Update the Secret object with the desired data
secret.Data = data
return nil
}
op, err := controllerutil.CreateOrUpdate(ctx, r.Client, secret, mutateFn)
if err != nil {
return fmt.Errorf("failed to create secret: %w", err)
}
r.Log.Infof("%s secret %s", secretType, op)
return nil
}
func (r *Credentials) kubeconfigExistsAndValid(ctx context.Context, cd *hivev1.ClusterDeployment, clusterInfo *lca_api.SeedReconfiguration) (bool, error) {
if clusterInfo == nil || clusterInfo.ClusterName != cd.Spec.ClusterName || clusterInfo.BaseDomain != cd.Spec.BaseDomain {
return false, nil
}
secretRef := types.NamespacedName{Namespace: cd.Namespace, Name: KubeconfigSecretName(cd.Name)}
secret := &corev1.Secret{}
err := r.Get(ctx, secretRef, secret)
if err == nil {
_, exists := secret.Data["kubeconfig"]
if !exists {
r.Log.Warn("failed to find kubeconfig in secret, generating new one")
return false, nil
}
// no changes to the cluster info, no error and the secret data have what we want.
return true, nil
}
if !errors.IsNotFound(err) {
return false, fmt.Errorf("failed to get kubeconfig secret: %w", err)
}
return false, nil
}
func KubeconfigSecretName(clusterDeploymentName string) string {
return clusterDeploymentName + "-admin-kubeconfig"
}
func KubeadminPasswordSecretName(clusterDeploymentName string) string {
return clusterDeploymentName + "-admin-password"
}
func generateKubeConfig(url string, certificateAuthData, userClientCert, userClientKey []byte) ([]byte, error) {
kubeCfg := clientcmdapi.Config{
Kind: "Config",
APIVersion: "v1",
}
kubeCfg.Clusters = map[string]*clientcmdapi.Cluster{
"cluster": {
Server: fmt.Sprintf("https://api.%s:6443", url),
CertificateAuthorityData: certificateAuthData,
},
}
kubeCfg.AuthInfos = map[string]*clientcmdapi.AuthInfo{
"admin": {
ClientCertificateData: userClientCert,
ClientKeyData: userClientKey,
},
}
kubeCfg.Contexts = map[string]*clientcmdapi.Context{
"admin": {
Cluster: "cluster",
AuthInfo: "admin",
Namespace: "default",
},
}
kubeCfg.CurrentContext = "admin"
return clientcmd.Write(kubeCfg)
}
func generateKubeadminPassword() (string, error) {
// This code was copied from the openshift installer
const (
lowerLetters = "abcdefghijkmnopqrstuvwxyz"
upperLetters = "ABCDEFGHIJKLMNPQRSTUVWXYZ"
digits = "23456789"
all = lowerLetters + upperLetters + digits
length = 23
)
var password string
for i := 0; i < length; i++ {
n, err := rand.Int(rand.Reader, big.NewInt(int64(len(all))))
if err != nil {
return "", err
}
newchar := string(all[n.Int64()])
if password == "" {
password = newchar
}
if i < length-1 {
n, err = rand.Int(rand.Reader, big.NewInt(int64(len(password)+1)))
if err != nil {
return "", err
}
j := n.Int64()
password = password[0:j] + newchar + password[j:]
}
}
pw := []rune(password)
for _, replace := range []int{5, 11, 17} {
pw[replace] = '-'
}
return string(pw), nil
}
func addLabel(labels map[string]string, labelKey, labelValue string) map[string]string {
if labelKey == "" {
// Don't need to add a label.
return labels
}
if labels == nil {
labels = make(map[string]string)
}
labels[labelKey] = labelValue
return labels
}