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generate_signer.go
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generate_signer.go
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package server
import (
"bytes"
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/securesign/operator/api/v1alpha1"
"github.com/securesign/operator/internal/controller/common/action"
k8sutils "github.com/securesign/operator/internal/controller/common/utils/kubernetes"
"github.com/securesign/operator/internal/controller/constants"
"github.com/securesign/operator/internal/controller/rekor/actions"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const secretNameFormat = "rekor-signer-%s-"
func NewGenerateSignerAction() action.Action[*v1alpha1.Rekor] {
return &generateSigner{}
}
type generateSigner struct {
action.BaseAction
}
func (g generateSigner) Name() string {
return "generate-signer"
}
func (g generateSigner) CanHandle(_ context.Context, instance *v1alpha1.Rekor) bool {
c := meta.FindStatusCondition(instance.Status.Conditions, constants.Ready)
if c == nil {
return false
}
if c.Reason != constants.Pending && c.Reason != constants.Ready {
return false
}
return instance.Status.Signer.KeyRef == nil || !equality.Semantic.DeepDerivative(instance.Spec.Signer, instance.Status.Signer)
}
func (g generateSigner) Handle(ctx context.Context, instance *v1alpha1.Rekor) *action.Result {
if instance.Spec.Signer.KMS != "secret" && instance.Spec.Signer.KMS != "" {
instance.Status.Signer = instance.Spec.Signer
// force recreation of public key ref
instance.Status.PublicKeyRef = nil
// skip signer resolution and move to creating
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: constants.Ready,
Status: metav1.ConditionFalse,
Reason: constants.Creating,
})
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.SignerCondition,
Status: metav1.ConditionTrue,
Reason: constants.Ready,
Message: "Not using Secret resource",
})
return g.StatusUpdate(ctx, instance)
}
// Return to pending state because Signer spec changed
if meta.FindStatusCondition(instance.Status.Conditions, constants.Ready).Reason != constants.Pending {
// force recreation of public key ref
instance.Status.PublicKeyRef = nil
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: constants.Ready,
Status: metav1.ConditionFalse,
Reason: constants.Pending,
},
)
return g.StatusUpdate(ctx, instance)
}
var (
err error
)
certConfig, err := g.CreateRekorKey(instance)
if err != nil {
if !meta.IsStatusConditionFalse(instance.Status.Conditions, actions.SignerCondition) {
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.SignerCondition,
Status: metav1.ConditionFalse,
Reason: constants.Failure,
Message: err.Error(),
})
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.ServerCondition,
Status: metav1.ConditionFalse,
Reason: constants.Pending,
Message: "resolving keys",
})
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: constants.Ready,
Status: metav1.ConditionFalse,
Reason: constants.Pending,
Message: "resolving keys",
})
return g.StatusUpdate(ctx, instance)
}
// swallow error and retry
return g.Requeue()
}
labels := constants.LabelsFor(actions.ServerComponentName, actions.ServerDeploymentName, instance.Name)
data := make(map[string][]byte)
if certConfig.RekorKey != nil {
data["private"] = certConfig.RekorKey
}
if certConfig.RekorKeyPassword != nil {
data["password"] = certConfig.RekorKeyPassword
}
if certConfig.RekorPubKey != nil {
data["public"] = certConfig.RekorPubKey
}
secret := k8sutils.CreateImmutableSecret(fmt.Sprintf(secretNameFormat, instance.Name), instance.Namespace,
data, labels)
if _, err = g.Ensure(ctx, secret); err != nil {
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.ServerCondition,
Status: metav1.ConditionFalse,
Reason: constants.Failure,
Message: err.Error(),
})
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: constants.Ready,
Status: metav1.ConditionFalse,
Reason: constants.Failure,
Message: err.Error(),
})
return g.FailedWithStatusUpdate(ctx, fmt.Errorf("could not create secret: %w", err), instance)
}
g.Recorder.Eventf(instance, v1.EventTypeNormal, "SignerKeyCreated", "Signer private key created: %s", secret.Name)
instance.Status.Signer = instance.Spec.Signer
if instance.Spec.Signer.KeyRef == nil {
instance.Status.Signer.KeyRef = &v1alpha1.SecretKeySelector{
Key: "private",
LocalObjectReference: v1alpha1.LocalObjectReference{
Name: secret.Name,
},
}
}
if _, ok := secret.Data["password"]; instance.Spec.Signer.PasswordRef == nil && ok {
instance.Status.Signer.PasswordRef = &v1alpha1.SecretKeySelector{
Key: "password",
LocalObjectReference: v1alpha1.LocalObjectReference{
Name: secret.Name,
},
}
} else {
instance.Status.Signer.PasswordRef = instance.Spec.Signer.PasswordRef
}
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.ServerCondition,
Status: metav1.ConditionFalse,
Reason: constants.Creating,
})
meta.SetStatusCondition(&instance.Status.Conditions, metav1.Condition{
Type: actions.SignerCondition,
Status: metav1.ConditionTrue,
Reason: constants.Ready,
})
return g.StatusUpdate(ctx, instance)
}
type RekorCertConfig struct {
RekorKey []byte
RekorPubKey []byte
RekorKeyPassword []byte
}
func (g generateSigner) CreateRekorKey(instance *v1alpha1.Rekor) (*RekorCertConfig, error) {
var err error
if instance.Spec.Signer.KeyRef != nil {
config := &RekorCertConfig{}
config.RekorKey, err = k8sutils.GetSecretData(g.Client, instance.Namespace, instance.Spec.Signer.KeyRef)
if err != nil {
return nil, err
}
if instance.Spec.Signer.PasswordRef != nil {
config.RekorKeyPassword, err = k8sutils.GetSecretData(g.Client, instance.Namespace, instance.Spec.Signer.PasswordRef)
if err != nil {
return nil, err
}
}
return config, nil
}
key, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
if err != nil {
return nil, err
}
mKey, err := x509.MarshalECPrivateKey(key)
if err != nil {
return nil, err
}
mPubKey, err := x509.MarshalPKIXPublicKey(key.Public())
if err != nil {
return nil, err
}
var pemRekorKey bytes.Buffer
err = pem.Encode(&pemRekorKey, &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: mKey,
})
if err != nil {
return nil, err
}
var pemPubKey bytes.Buffer
err = pem.Encode(&pemPubKey, &pem.Block{
Type: "PUBLIC KEY",
Bytes: mPubKey,
})
if err != nil {
return nil, err
}
return &RekorCertConfig{
RekorKey: pemRekorKey.Bytes(),
RekorPubKey: pemPubKey.Bytes(),
}, nil
}