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/*
* ============LICENSE_START=======================================================
* oom-certservice-k8s-external-provider
* ================================================================================
* Copyright (c) 2019 Smallstep Labs, Inc.
* Modifications copyright (C) 2020 Nokia. All rights reserved.
* ================================================================================
* This source code was copied from the following git repository:
* https://github.com/smallstep/step-issuer
* The source code was modified for usage in the ONAP project.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package provisioners
import (
"bytes"
"context"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
certmanager "github.com/jetstack/cert-manager/pkg/apis/certmanager/v1alpha2"
"k8s.io/apimachinery/pkg/types"
"onap.org/oom-certservice/k8s-external-provider/src/api"
ctrl "sigs.k8s.io/controller-runtime"
"sync"
)
var collection = new(sync.Map)
type CertServiceCA struct {
name string
url string
key []byte
}
func New(iss *api.CertServiceIssuer, key []byte) (*CertServiceCA, error) {
ca := CertServiceCA{}
ca.name = iss.Name
ca.url = iss.Spec.URL
ca.key = key
log := ctrl.Log.WithName("certservice-provisioner")
log.Info("Configuring CA: ", "name", ca.name, "url", ca.url, "key", ca.key)
return &ca, nil
}
func Load(namespacedName types.NamespacedName) (*CertServiceCA, bool) {
v, ok := collection.Load(namespacedName)
if !ok {
return nil, ok
}
p, ok := v.(*CertServiceCA)
return p, ok
}
func Store(namespacedName types.NamespacedName, provisioner *CertServiceCA) {
collection.Store(namespacedName, provisioner)
}
func (ca *CertServiceCA) Sign(ctx context.Context, cr *certmanager.CertificateRequest) ([]byte, []byte, error) {
log := ctrl.Log.WithName("certservice-provisioner")
log.Info("Signing certificate: ", "cert-name", cr.Name)
key, _ := base64.RawStdEncoding.DecodeString(string(ca.key))
log.Info("CA: ", "name", ca.name, "url", ca.url, "key", key)
crPEM := cr.Spec.CSRPEM
csrBase64 := crPEM
log.Info("Csr PEM: ", "bytes", csrBase64)
csr, err := decodeCSR(crPEM)
if err != nil {
return nil, nil, err
}
cert := x509.Certificate{}
cert.Raw = csr.Raw
// TODO
// write here code which will call CertServiceCA and sign CSR
// END
encodedPEM, err := encodeX509(&cert)
if err != nil {
return nil, nil, err
}
signedPEM := encodedPEM
trustedCA := encodedPEM
log.Info("Successfully signed: ", "cert-name", cr.Name)
log.Info("Signed cert PEM: ", "bytes", signedPEM)
log.Info("Trusted CA PEM: ", "bytes", trustedCA)
return signedPEM, trustedCA, nil
}
// TODO JM utility methods - will be used in "real" implementation
// decodeCSR decodes a certificate request in PEM format and returns the
func decodeCSR(data []byte) (*x509.CertificateRequest, error) {
block, rest := pem.Decode(data)
if block == nil || len(rest) > 0 {
return nil, fmt.Errorf("unexpected CSR PEM on sign request")
}
if block.Type != "CERTIFICATE REQUEST" {
return nil, fmt.Errorf("PEM is not a certificate request")
}
csr, err := x509.ParseCertificateRequest(block.Bytes)
if err != nil {
return nil, fmt.Errorf("error parsing certificate request: %v", err)
}
if err := csr.CheckSignature(); err != nil {
return nil, fmt.Errorf("error checking certificate request signature: %v", err)
}
return csr, nil
}
// encodeX509 will encode a *x509.Certificate into PEM format.
func encodeX509(cert *x509.Certificate) ([]byte, error) {
caPem := bytes.NewBuffer([]byte{})
err := pem.Encode(caPem, &pem.Block{Type: "CERTIFICATE", Bytes: cert.Raw})
if err != nil {
return nil, err
}
return caPem.Bytes(), nil
}
// generateSubject returns the first SAN that is not 127.0.0.1 or localhost. The
// CSRs generated by the Certificate resource have always those SANs. If no SANs
// are available `certservice-issuer-certificate` will be used as a subject is always
// required.
func generateSubject(sans []string) string {
if len(sans) == 0 {
return "certservice-issuer-certificate"
}
for _, s := range sans {
if s != "127.0.0.1" && s != "localhost" {
return s
}
}
return sans[0]
}
func decode(cert string) []byte {
bytes, _ := base64.RawStdEncoding.DecodeString(cert)
return bytes
}
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