115 lines
3.4 KiB
Go
115 lines
3.4 KiB
Go
package ca
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import (
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"bytes"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"math/big"
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"time"
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"github.com/jetstack-experimental/cert-manager/pkg/apis/certmanager/v1alpha1"
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"github.com/jetstack-experimental/cert-manager/pkg/util/kube"
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"github.com/jetstack-experimental/cert-manager/pkg/util/pki"
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k8sErrors "k8s.io/apimachinery/pkg/api/errors"
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)
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const (
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// certificateDuration of 1 year
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certificateDuration = time.Hour * 24 * 365
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defaultOrganization = "cert-manager"
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)
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func (c *CA) Issue(crt *v1alpha1.Certificate) ([]byte, []byte, error) {
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signerCert, err := kube.SecretTLSCert(c.secretsLister, c.issuer.Namespace, c.issuer.Spec.CA.SecretRef.Name)
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if err != nil {
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return nil, nil, err
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}
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signerKey, err := kube.SecretTLSKey(c.secretsLister, c.issuer.Namespace, c.issuer.Spec.CA.SecretRef.Name)
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if err != nil {
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return nil, nil, err
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}
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signeeKey, err := kube.SecretTLSKey(c.secretsLister, c.issuer.Namespace, crt.Spec.SecretName)
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if k8sErrors.IsNotFound(err) {
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signeeKey, err = pki.GenerateRSAPrivateKey(2048)
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if err != nil {
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return nil, nil, fmt.Errorf("error generating private key: %s", err.Error())
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}
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}
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if signeeKey == nil {
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return nil, nil, fmt.Errorf("error getting certificate private key: %s", err.Error())
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}
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crtPem, _, err := signCertificate(crt, signerCert, &signeeKey.PublicKey, signerKey)
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if err != nil {
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return nil, nil, err
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}
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return pki.EncodePKCS1PrivateKey(signeeKey), crtPem, nil
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}
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func createCertificateTemplate(crt *v1alpha1.Certificate, publicKey interface{}) (*x509.Certificate, error) {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, fmt.Errorf("failed to generate serial number: %s", err.Error())
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}
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cert := &x509.Certificate{
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Version: 3,
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BasicConstraintsValid: true,
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SerialNumber: serialNumber,
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SignatureAlgorithm: x509.SHA256WithRSA,
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PublicKey: publicKey,
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Subject: pkix.Name{
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Organization: []string{defaultOrganization},
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CommonName: crt.Spec.Domains[0],
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(certificateDuration),
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// see http://golang.org/pkg/crypto/x509/#KeyUsage
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KeyUsage: x509.KeyUsageDigitalSignature,
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DNSNames: crt.Spec.Domains,
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}
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return cert, nil
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}
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// signCertificate returns a signed x509.Certificate object for the given
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// *v1alpha1.Certificate crt.
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// publicKey is the public key of the signee, and signerKey is the private
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// key of the signer.
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func signCertificate(crt *v1alpha1.Certificate, issuerCert *x509.Certificate, publicKey interface{}, signerKey interface{}) ([]byte, *x509.Certificate, error) {
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template, err := createCertificateTemplate(crt, publicKey)
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if err != nil {
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return nil, nil, fmt.Errorf("Error creating x509 certificate template: %s", err.Error())
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, template, issuerCert, publicKey, signerKey)
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if err != nil {
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return nil, nil, fmt.Errorf("Error creating x509 certificate: %s", err.Error())
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}
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cert, err := pki.DecodeDERCertificateBytes(derBytes)
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if err != nil {
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return nil, nil, fmt.Errorf("Error decoding DER certificate bytes: %s", err.Error())
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}
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pemBytes := bytes.NewBuffer([]byte{})
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err = pem.Encode(pemBytes, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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if err != nil {
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return nil, nil, fmt.Errorf("Error encoding certificate PEM: %s", err.Error())
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}
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return pemBytes.Bytes(), cert, err
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}
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