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vault.go
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vault.go
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/*
Copyright 2021 The cert-manager Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package vault
import (
"context"
"crypto"
"crypto/x509"
"fmt"
certificatesv1 "k8s.io/api/certificates/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
certificatesclient "k8s.io/client-go/kubernetes/typed/certificates/v1"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/record"
internalvault "github.com/cert-manager/cert-manager/internal/vault"
apiutil "github.com/cert-manager/cert-manager/pkg/api/util"
cmapi "github.com/cert-manager/cert-manager/pkg/apis/certmanager/v1"
controllerpkg "github.com/cert-manager/cert-manager/pkg/controller"
"github.com/cert-manager/cert-manager/pkg/controller/certificatesigningrequests"
"github.com/cert-manager/cert-manager/pkg/controller/certificatesigningrequests/util"
logf "github.com/cert-manager/cert-manager/pkg/logs"
"github.com/cert-manager/cert-manager/pkg/util/pki"
)
const (
CSRControllerName = "certificatesigningrequests-issuer-vault"
)
type signingFn func(*x509.Certificate, *x509.Certificate, crypto.PublicKey, interface{}) ([]byte, *x509.Certificate, error)
// Vault is a controller for signing Kubernetes CertificateSigningRequest
// using Vault Issuers.
type Vault struct {
issuerOptions controllerpkg.IssuerOptions
secretsLister corelisters.SecretLister
recorder record.EventRecorder
certClient certificatesclient.CertificateSigningRequestInterface
clientBuilder internalvault.ClientBuilder
// fieldManager is the manager name used for the Apply operations.
fieldManager string
}
func init() {
controllerpkg.Register(CSRControllerName, func(ctx *controllerpkg.ContextFactory) (controllerpkg.Interface, error) {
return controllerpkg.NewBuilder(ctx, CSRControllerName).
For(certificatesigningrequests.New(apiutil.IssuerVault, NewVault)).
Complete()
})
}
func NewVault(ctx *controllerpkg.Context) certificatesigningrequests.Signer {
return &Vault{
issuerOptions: ctx.IssuerOptions,
secretsLister: ctx.KubeSharedInformerFactory.Core().V1().Secrets().Lister(),
recorder: ctx.Recorder,
certClient: ctx.Client.CertificatesV1().CertificateSigningRequests(),
clientBuilder: internalvault.New,
fieldManager: ctx.FieldManager,
}
}
// Sign attempts to sign the given CertificateSigningRequest based on the
// provided Vault Issuer or ClusterIssuer. This function updates the
// CertificateSigningRequest resource if signing was successful. Returns an
// error which, if not nil, should trigger a retry.
func (v *Vault) Sign(ctx context.Context, csr *certificatesv1.CertificateSigningRequest, issuerObj cmapi.GenericIssuer) error {
log := logf.FromContext(ctx, "sign")
log = logf.WithRelatedResource(log, issuerObj)
resourceNamespace := v.issuerOptions.ResourceNamespace(issuerObj)
client, err := v.clientBuilder(resourceNamespace, v.secretsLister, issuerObj)
if apierrors.IsNotFound(err) {
message := "Required secret resource not found"
log.Error(err, message)
v.recorder.Event(csr, corev1.EventTypeWarning, "SecretNotFound", message)
util.CertificateSigningRequestSetFailed(csr, "SecretNotFound", message)
_, err := util.UpdateOrApplyStatus(ctx, v.certClient, csr, certificatesv1.CertificateFailed, v.fieldManager)
return err
}
if err != nil {
message := fmt.Sprintf("Failed to initialise vault client for signing: %s", err)
log.Error(err, message)
v.recorder.Event(csr, corev1.EventTypeWarning, "ErrorVaultInit", message)
return err
}
duration, err := pki.DurationFromCertificateSigningRequest(csr)
if err != nil {
message := fmt.Sprintf("Failed to parse requested duration: %s", err)
log.Error(err, message)
v.recorder.Event(csr, corev1.EventTypeWarning, "ErrorParseDuration", message)
util.CertificateSigningRequestSetFailed(csr, "ErrorParseDuration", message)
_, err := util.UpdateOrApplyStatus(ctx, v.certClient, csr, certificatesv1.CertificateFailed, v.fieldManager)
return err
}
certPEM, _, err := client.Sign(csr.Spec.Request, duration)
if err != nil {
message := fmt.Sprintf("Vault failed to sign: %s", err)
log.Error(err, message)
v.recorder.Event(csr, corev1.EventTypeWarning, "ErrorSigning", message)
util.CertificateSigningRequestSetFailed(csr, "ErrorSigning", message)
_, err := util.UpdateOrApplyStatus(ctx, v.certClient, csr, certificatesv1.CertificateFailed, v.fieldManager)
return err
}
log.V(logf.DebugLevel).Info("certificate issued")
csr.Status.Certificate = certPEM
csr, err = util.UpdateOrApplyStatus(ctx, v.certClient, csr, "", v.fieldManager)
if err != nil {
message := "Error updating certificate"
v.recorder.Eventf(csr, corev1.EventTypeWarning, "ErrorUpdate", "%s: %s", message, err)
return err
}
log.V(logf.DebugLevel).Info("vault certificate issued")
v.recorder.Event(csr, corev1.EventTypeNormal, "CertificateIssued", "Certificate signed successfully")
return nil
}