116 lines
3 KiB
Go
116 lines
3 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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 triple generates key-certificate pairs for the
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// triple (CA, Server, Client).
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package triple
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import (
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"crypto/rsa"
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"crypto/x509"
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"fmt"
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"net"
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certutil "k8s.io/client-go/util/cert"
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)
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type KeyPair struct {
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Key *rsa.PrivateKey
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Cert *x509.Certificate
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}
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func NewCA(name string) (*KeyPair, error) {
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key, err := certutil.NewPrivateKey()
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if err != nil {
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return nil, fmt.Errorf("unable to create a private key for a new CA: %v", err)
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}
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config := certutil.Config{
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CommonName: name,
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}
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cert, err := certutil.NewSelfSignedCACert(config, key)
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if err != nil {
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return nil, fmt.Errorf("unable to create a self-signed certificate for a new CA: %v", err)
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}
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return &KeyPair{
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Key: key,
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Cert: cert,
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}, nil
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}
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func NewServerKeyPair(ca *KeyPair, commonName, svcName, svcNamespace, dnsDomain string, ips, hostnames []string) (*KeyPair, error) {
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key, err := certutil.NewPrivateKey()
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if err != nil {
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return nil, fmt.Errorf("unable to create a server private key: %v", err)
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}
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namespacedName := fmt.Sprintf("%s.%s", svcName, svcNamespace)
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internalAPIServerFQDN := []string{
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svcName,
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namespacedName,
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fmt.Sprintf("%s.svc", namespacedName),
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fmt.Sprintf("%s.svc.%s", namespacedName, dnsDomain),
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}
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altNames := certutil.AltNames{}
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for _, ipStr := range ips {
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ip := net.ParseIP(ipStr)
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if ip != nil {
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altNames.IPs = append(altNames.IPs, ip)
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}
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}
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altNames.DNSNames = append(altNames.DNSNames, hostnames...)
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altNames.DNSNames = append(altNames.DNSNames, internalAPIServerFQDN...)
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config := certutil.Config{
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CommonName: commonName,
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AltNames: altNames,
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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}
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cert, err := certutil.NewSignedCert(config, key, ca.Cert, ca.Key)
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if err != nil {
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return nil, fmt.Errorf("unable to sign the server certificate: %v", err)
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}
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return &KeyPair{
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Key: key,
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Cert: cert,
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}, nil
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}
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func NewClientKeyPair(ca *KeyPair, commonName string, organizations []string) (*KeyPair, error) {
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key, err := certutil.NewPrivateKey()
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if err != nil {
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return nil, fmt.Errorf("unable to create a client private key: %v", err)
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}
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config := certutil.Config{
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CommonName: commonName,
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Organization: organizations,
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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}
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cert, err := certutil.NewSignedCert(config, key, ca.Cert, ca.Key)
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if err != nil {
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return nil, fmt.Errorf("unable to sign the client certificate: %v", err)
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}
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return &KeyPair{
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Key: key,
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Cert: cert,
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}, nil
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}
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