143 lines
4.4 KiB
Go
143 lines
4.4 KiB
Go
package pki
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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/cert-manager/pkg/apis/certmanager/v1alpha1"
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"github.com/jetstack/cert-manager/pkg/util"
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)
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func CommonNameForCertificate(crt *v1alpha1.Certificate) string {
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if crt.Spec.CommonName != "" {
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return crt.Spec.CommonName
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}
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if len(crt.Spec.DNSNames) == 0 {
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return ""
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}
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return crt.Spec.DNSNames[0]
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}
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func DNSNamesForCertificate(crt *v1alpha1.Certificate) []string {
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if len(crt.Spec.DNSNames) == 0 {
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if crt.Spec.CommonName == "" {
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return []string{}
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}
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return []string{crt.Spec.CommonName}
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}
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if crt.Spec.CommonName != "" {
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return util.RemoveDuplicates(append([]string{crt.Spec.CommonName}, crt.Spec.DNSNames...))
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}
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return crt.Spec.DNSNames
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}
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var serialNumberLimit = new(big.Int).Lsh(big.NewInt(1), 128)
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// TODO: allow this to be configurable
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const defaultOrganization = "cert-manager"
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const defaultSignatureAlgorithm = x509.SHA256WithRSA
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// default certification duration is 1 year
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const defaultNotAfter = time.Hour * 24 * 365
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func GenerateCSR(issuer v1alpha1.GenericIssuer, crt *v1alpha1.Certificate) (*x509.CertificateRequest, error) {
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commonName := CommonNameForCertificate(crt)
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dnsNames := DNSNamesForCertificate(crt)
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if len(commonName) == 0 && len(dnsNames) == 0 {
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return nil, fmt.Errorf("no domains specified on certificate")
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}
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return &x509.CertificateRequest{
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Version: 3,
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SignatureAlgorithm: defaultSignatureAlgorithm,
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Subject: pkix.Name{
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Organization: []string{defaultOrganization},
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CommonName: commonName,
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},
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DNSNames: dnsNames,
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// TODO: work out how best to handle extensions/key usages here
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ExtraExtensions: []pkix.Extension{},
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}, nil
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}
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// GenerateTemplate will create a x509.Certificate for the given Certificate resource.
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// This should create a Certificate template that is equivalent to the CertificateRequest
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// generated by GenerateCSR.
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// The PublicKey field must be populated by the caller.
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func GenerateTemplate(issuer v1alpha1.GenericIssuer, crt *v1alpha1.Certificate, serialNo *big.Int) (*x509.Certificate, error) {
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commonName := CommonNameForCertificate(crt)
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dnsNames := DNSNamesForCertificate(crt)
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if len(commonName) == 0 && len(dnsNames) == 0 {
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return nil, fmt.Errorf("no domains specified on certificate")
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}
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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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return &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: defaultSignatureAlgorithm,
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Subject: pkix.Name{
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Organization: []string{defaultOrganization},
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CommonName: commonName,
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},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(defaultNotAfter),
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// see http://golang.org/pkg/crypto/x509/#KeyUsage
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
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DNSNames: dnsNames,
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}, 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(template *x509.Certificate, issuerCert *x509.Certificate, publicKey interface{}, signerKey interface{}) ([]byte, *x509.Certificate, error) {
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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 := 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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// bundle the CA
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err = pem.Encode(pemBytes, &pem.Block{Type: "CERTIFICATE", Bytes: issuerCert.Raw})
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if err != nil {
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return nil, nil, fmt.Errorf("error encoding issuer cetificate 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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func EncodeCSR(template *x509.CertificateRequest, key interface{}) ([]byte, error) {
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derBytes, err := x509.CreateCertificateRequest(rand.Reader, template, key)
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if err != nil {
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return nil, fmt.Errorf("error creating x509 certificate: %s", err.Error())
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}
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return derBytes, nil
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}
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