129 lines
4.6 KiB
Go
129 lines
4.6 KiB
Go
/*
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Copyright 2018 The Jetstack cert-manager contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ca
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import (
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"context"
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"crypto/x509"
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"fmt"
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k8sErrors "k8s.io/apimachinery/pkg/api/errors"
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"github.com/jetstack/cert-manager/pkg/apis/certmanager/v1alpha1"
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"github.com/jetstack/cert-manager/pkg/issuer"
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"github.com/jetstack/cert-manager/pkg/util/errors"
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"github.com/jetstack/cert-manager/pkg/util/kube"
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"github.com/jetstack/cert-manager/pkg/util/pki"
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)
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const (
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reasonPending = "Pending"
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reasonErrorPrivateKey = "ErrorPrivateKey"
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reasonErrorCA = "ErrorCA"
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reasonErrorSigning = "ErrorSigning"
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)
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// Issue will issue a certificate using the CA issuer contained in CA.
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// It uses the 'Ready' status condition to convey the majority of failures, and
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// treats them all as errors to be retried.
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// If there are any failures, they are likely caused by missing or invalid
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// supporting resources, and to ensure we re-attempt issuance when these resources
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// are fixed, it always returns an error on any failure.
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func (c *CA) Issue(ctx context.Context, crt *v1alpha1.Certificate) (issuer.IssueResponse, error) {
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signeeKey, err := kube.SecretTLSKey(c.secretsLister, crt.Namespace, crt.Spec.SecretName)
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if k8sErrors.IsNotFound(err) || errors.IsInvalidData(err) {
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signeeKey, err = pki.GeneratePrivateKeyForCertificate(crt)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorPrivateKey, fmt.Sprintf("Error generating private key for certificate: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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}
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorPrivateKey, fmt.Sprintf("Error getting private key for certificate: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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publicKey, err := pki.PublicKeyForPrivateKey(signeeKey)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorPrivateKey, fmt.Sprintf("Error getting public key from private key: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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caCert, err := kube.SecretTLSCert(c.secretsLister, c.resourceNamespace, c.issuer.GetSpec().CA.SecretName)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorCA, fmt.Sprintf("Error getting signing CA: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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certPem, err := c.obtainCertificate(crt, publicKey, caCert)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorSigning, fmt.Sprintf("Error signing certificate: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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// Encode output private key and CA cert ready for return
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keyPem, err := pki.EncodePrivateKey(signeeKey)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorPrivateKey, fmt.Sprintf("Error encoding certificate private key: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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caPem, err := pki.EncodeX509(caCert)
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if err != nil {
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crt.UpdateStatusCondition(v1alpha1.CertificateConditionReady, v1alpha1.ConditionFalse,
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reasonErrorSigning, fmt.Sprintf("Error encoding certificate: %v", err), false)
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return issuer.IssueResponse{}, err
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}
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return issuer.IssueResponse{
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PrivateKey: keyPem,
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Certificate: certPem,
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CA: caPem,
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}, nil
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}
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func (c *CA) obtainCertificate(crt *v1alpha1.Certificate, signeeKey interface{}, signerCert *x509.Certificate) ([]byte, error) {
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commonName := crt.Spec.CommonName
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altNames := crt.Spec.DNSNames
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if len(commonName) == 0 && len(altNames) == 0 {
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return nil, fmt.Errorf("no domains specified on certificate")
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}
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signerKey, err := kube.SecretTLSKey(c.secretsLister, c.resourceNamespace, c.issuer.GetSpec().CA.SecretName)
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if err != nil {
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return nil, fmt.Errorf("error getting issuer private key: %s", err.Error())
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}
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template, err := pki.GenerateTemplate(c.issuer, crt)
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if err != nil {
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return nil, err
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}
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crtPem, _, err := pki.SignCertificate(template, signerCert, signeeKey, signerKey)
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if err != nil {
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return nil, err
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}
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return crtPem, nil
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}
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