500 lines
15 KiB
Go
500 lines
15 KiB
Go
/*
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Copyright 2023 The Karmada 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 certs
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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cryptorand "crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"errors"
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"fmt"
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"math"
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"math/big"
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"net"
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"time"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/validation"
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certutil "k8s.io/client-go/util/cert"
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"k8s.io/client-go/util/keyutil"
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netutils "k8s.io/utils/net"
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operatorv1alpha1 "github.com/karmada-io/karmada/operator/pkg/apis/operator/v1alpha1"
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"github.com/karmada-io/karmada/operator/pkg/constants"
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"github.com/karmada-io/karmada/operator/pkg/util"
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)
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const (
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// CertificateBlockType is a possible value for pem.Block.Type.
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CertificateBlockType = "CERTIFICATE"
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rsaKeySize = 3072
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keyExtension = ".key"
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certExtension = ".crt"
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)
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// AltNamesMutatorConfig is a config to AltNamesMutator. It includes necessary
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// configs to AltNamesMutator.
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type AltNamesMutatorConfig struct {
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Name string
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Namespace string
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ControlplaneAddress string
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Components *operatorv1alpha1.KarmadaComponents
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}
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type altNamesMutatorFunc func(*AltNamesMutatorConfig, *CertConfig) error
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// CertConfig represents a config to generate certificate by karmada.
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type CertConfig struct {
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Name string
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CAName string
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NotAfter *time.Time
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PublicKeyAlgorithm x509.PublicKeyAlgorithm // TODO: All public key of karmada cert use the RSA algorithm by default
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Config certutil.Config
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AltNamesMutatorFunc altNamesMutatorFunc
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}
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func (config *CertConfig) defaultPublicKeyAlgorithm() {
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if config.PublicKeyAlgorithm == x509.UnknownPublicKeyAlgorithm {
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config.PublicKeyAlgorithm = x509.RSA
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}
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}
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func (config *CertConfig) defaultNotAfter() {
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if config.NotAfter == nil {
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notAfter := time.Now().Add(constants.CertificateValidity).UTC()
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config.NotAfter = ¬After
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}
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}
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// GetDefaultCertList returns all of karmada certConfigs, it include karmada, front and etcd.
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func GetDefaultCertList() []*CertConfig {
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return []*CertConfig{
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// karmada cert config.
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KarmadaCertRootCA(),
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KarmadaCertAdmin(),
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KarmadaCertApiserver(),
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// front proxy cert config.
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KarmadaCertFrontProxyCA(),
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KarmadaCertFrontProxyClient(),
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// ETCD cert config.
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KarmadaCertEtcdCA(),
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KarmadaCertEtcdServer(),
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KarmadaCertEtcdClient(),
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}
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}
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// KarmadaCertRootCA returns karmada ca cert config.
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func KarmadaCertRootCA() *CertConfig {
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return &CertConfig{
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Name: constants.CaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "karmada",
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},
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}
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}
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// KarmadaCertAdmin returns karmada client cert config.
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func KarmadaCertAdmin() *CertConfig {
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return &CertConfig{
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Name: constants.KarmadaCertAndKeyName,
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CAName: constants.CaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "system:admin",
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Organization: []string{"system:masters"},
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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},
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AltNamesMutatorFunc: makeAltNamesMutator(apiServerAltNamesMutator),
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}
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}
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// KarmadaCertApiserver returns karmada apiserver cert config.
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func KarmadaCertApiserver() *CertConfig {
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return &CertConfig{
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Name: constants.ApiserverCertAndKeyName,
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CAName: constants.CaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "karmada-apiserver",
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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},
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AltNamesMutatorFunc: makeAltNamesMutator(apiServerAltNamesMutator),
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}
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}
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// KarmadaCertClient returns karmada client cert config.
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func KarmadaCertClient() *CertConfig {
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return &CertConfig{
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Name: "karmada-client",
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CAName: constants.CaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "system:admin",
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Organization: []string{"system:masters"},
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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},
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AltNamesMutatorFunc: makeAltNamesMutator(apiServerAltNamesMutator),
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}
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}
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// KarmadaCertFrontProxyCA returns karmada front proxy cert config.
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func KarmadaCertFrontProxyCA() *CertConfig {
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return &CertConfig{
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Name: constants.FrontProxyCaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "front-proxy-ca",
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},
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}
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}
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// KarmadaCertFrontProxyClient returns karmada front proxy client cert config.
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func KarmadaCertFrontProxyClient() *CertConfig {
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return &CertConfig{
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Name: constants.FrontProxyClientCertAndKeyName,
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CAName: constants.FrontProxyCaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "front-proxy-client",
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
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},
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}
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}
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// KarmadaCertEtcdCA returns karmada front proxy client cert config.
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func KarmadaCertEtcdCA() *CertConfig {
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return &CertConfig{
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Name: constants.EtcdCaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "karmada-etcd-ca",
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},
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}
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}
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// KarmadaCertEtcdServer returns etcd server cert config.
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func KarmadaCertEtcdServer() *CertConfig {
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return &CertConfig{
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Name: constants.EtcdServerCertAndKeyName,
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CAName: constants.EtcdCaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "karmada-etcd-server",
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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},
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AltNamesMutatorFunc: makeAltNamesMutator(etcdServerAltNamesMutator),
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}
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}
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// KarmadaCertEtcdClient returns etcd client cert config.
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func KarmadaCertEtcdClient() *CertConfig {
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return &CertConfig{
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Name: constants.EtcdClientCertAndKeyName,
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CAName: constants.EtcdCaCertAndKeyName,
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Config: certutil.Config{
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CommonName: "karmada-etcd-client",
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Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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},
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}
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}
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// KarmadaCert is karmada certificate, it includes certificate basic message.
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// we can directly get the byte array of certificate key and cert from the object.
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type KarmadaCert struct {
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pairName string
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caName string
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cert []byte
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key []byte
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}
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// CertData returns certificate cert data.
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func (cert *KarmadaCert) CertData() []byte {
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return cert.cert
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}
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// KeyData returns certificate key data.
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func (cert *KarmadaCert) KeyData() []byte {
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return cert.key
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}
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// CertName returns cert file name. its default suffix is ".crt".
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func (cert *KarmadaCert) CertName() string {
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pair := cert.pairName
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if len(pair) == 0 {
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pair = "cert"
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}
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return pair + certExtension
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}
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// KeyName returns cert key file name. its default suffix is ".key".
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func (cert *KarmadaCert) KeyName() string {
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pair := cert.pairName
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if len(pair) == 0 {
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pair = "cert"
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}
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return pair + keyExtension
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}
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// GeneratePrivateKey generates cert key with default size if 1024. it supports
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// ECDSA and RAS algorithm.
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func GeneratePrivateKey(keyType x509.PublicKeyAlgorithm) (crypto.Signer, error) {
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if keyType == x509.ECDSA {
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return ecdsa.GenerateKey(elliptic.P256(), cryptorand.Reader)
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}
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return rsa.GenerateKey(cryptorand.Reader, rsaKeySize)
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}
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// NewCertificateAuthority creates new certificate and private key for the certificate authority
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func NewCertificateAuthority(cc *CertConfig) (*KarmadaCert, error) {
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cc.defaultPublicKeyAlgorithm()
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key, err := GeneratePrivateKey(cc.PublicKeyAlgorithm)
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if err != nil {
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return nil, fmt.Errorf("unable to create private key while generating CA certificate, err: %w", err)
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}
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cert, err := certutil.NewSelfSignedCACert(cc.Config, key)
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if err != nil {
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return nil, fmt.Errorf("unable to create self-signed CA certificate, err: %w", err)
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}
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encoded, err := keyutil.MarshalPrivateKeyToPEM(key)
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if err != nil {
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return nil, fmt.Errorf("unable to marshal private key to PEM, err: %w", err)
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}
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return &KarmadaCert{
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pairName: cc.Name,
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caName: cc.CAName,
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cert: EncodeCertPEM(cert),
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key: encoded,
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}, nil
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}
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// CreateCertAndKeyFilesWithCA loads the given certificate authority from disk, then generates and writes out the given certificate and key.
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// The certSpec and caCertSpec should both be one of the variables from this package.
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func CreateCertAndKeyFilesWithCA(cc *CertConfig, caCertData, caKeyData []byte) (*KarmadaCert, error) {
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if len(cc.Config.Usages) == 0 {
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return nil, fmt.Errorf("must specify at least one ExtKeyUsage")
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}
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cc.defaultNotAfter()
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cc.defaultPublicKeyAlgorithm()
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key, err := GeneratePrivateKey(cc.PublicKeyAlgorithm)
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if err != nil {
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return nil, fmt.Errorf("unable to create private key, err: %w", err)
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}
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caCerts, err := certutil.ParseCertsPEM(caCertData)
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if err != nil {
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return nil, err
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}
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caKey, err := ParsePrivateKeyPEM(caKeyData)
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if err != nil {
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return nil, err
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}
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// Safely pick the first one because the sender's certificate must come first in the list.
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// For details, see: https://www.rfc-editor.org/rfc/rfc4346#section-7.4.2
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caCert := caCerts[0]
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cert, err := NewSignedCert(cc, key, caCert, caKey, false)
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if err != nil {
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return nil, err
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}
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encoded, err := keyutil.MarshalPrivateKeyToPEM(key)
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if err != nil {
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return nil, fmt.Errorf("unable to marshal private key to PEM, err: %w", err)
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}
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return &KarmadaCert{
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pairName: cc.Name,
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caName: cc.CAName,
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cert: EncodeCertPEM(cert),
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key: encoded,
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}, nil
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}
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// NewSignedCert creates a signed certificate using the given CA certificate and key
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func NewSignedCert(cc *CertConfig, key crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer, isCA bool) (*x509.Certificate, error) {
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serial, err := cryptorand.Int(cryptorand.Reader, new(big.Int).SetInt64(math.MaxInt64))
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if err != nil {
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return nil, err
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}
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if len(cc.Config.CommonName) == 0 {
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return nil, fmt.Errorf("must specify a CommonName")
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}
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keyUsage := x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature
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if isCA {
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keyUsage |= x509.KeyUsageCertSign
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}
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RemoveDuplicateAltNames(&cc.Config.AltNames)
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certTmpl := x509.Certificate{
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Subject: pkix.Name{
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CommonName: cc.Config.CommonName,
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Organization: cc.Config.Organization,
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},
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DNSNames: cc.Config.AltNames.DNSNames,
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IPAddresses: cc.Config.AltNames.IPs,
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SerialNumber: serial,
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NotBefore: caCert.NotBefore,
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NotAfter: cc.NotAfter.UTC(),
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KeyUsage: keyUsage,
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ExtKeyUsage: cc.Config.Usages,
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BasicConstraintsValid: true,
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IsCA: isCA,
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}
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certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &certTmpl, caCert, key.Public(), caKey)
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if err != nil {
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return nil, err
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}
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return x509.ParseCertificate(certDERBytes)
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}
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// RemoveDuplicateAltNames removes duplicate items in altNames.
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func RemoveDuplicateAltNames(altNames *certutil.AltNames) {
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if altNames == nil {
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return
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}
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if altNames.DNSNames != nil {
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altNames.DNSNames = sets.NewString(altNames.DNSNames...).List()
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}
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ipsKeys := make(map[string]struct{})
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var ips []net.IP
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for _, one := range altNames.IPs {
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if _, ok := ipsKeys[one.String()]; !ok {
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ipsKeys[one.String()] = struct{}{}
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ips = append(ips, one)
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}
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}
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altNames.IPs = ips
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}
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func appendSANsToAltNames(altNames *certutil.AltNames, SANs []string) {
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for _, altname := range SANs {
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if ip := netutils.ParseIPSloppy(altname); ip != nil {
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altNames.IPs = append(altNames.IPs, ip)
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} else if len(validation.IsDNS1123Subdomain(altname)) == 0 {
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altNames.DNSNames = append(altNames.DNSNames, altname)
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} else if len(validation.IsWildcardDNS1123Subdomain(altname)) == 0 {
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altNames.DNSNames = append(altNames.DNSNames, altname)
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}
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}
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}
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// EncodeCertPEM returns PEM-encoded certificate data
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func EncodeCertPEM(cert *x509.Certificate) []byte {
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block := pem.Block{
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Type: CertificateBlockType,
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Bytes: cert.Raw,
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}
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return pem.EncodeToMemory(&block)
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}
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// ParsePrivateKeyPEM parses crypto.Signer from byte array. the key
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// must be encryption by ECDSA and RAS.
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func ParsePrivateKeyPEM(keyData []byte) (crypto.Signer, error) {
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caPrivateKey, err := keyutil.ParsePrivateKeyPEM(keyData)
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if err != nil {
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return nil, err
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}
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// Allow RSA and ECDSA formats only
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var key crypto.Signer
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switch k := caPrivateKey.(type) {
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case *rsa.PrivateKey:
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key = k
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case *ecdsa.PrivateKey:
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key = k
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default:
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return nil, errors.New("the private key is neither in RSA nor ECDSA format")
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}
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return key, nil
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}
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func makeAltNamesMutator(f func(cfg *AltNamesMutatorConfig) (*certutil.AltNames, error)) altNamesMutatorFunc {
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return func(cfg *AltNamesMutatorConfig, cc *CertConfig) error {
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altNames, err := f(cfg)
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if err != nil {
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return err
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}
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cc.Config.AltNames = *altNames
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return nil
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}
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}
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func etcdServerAltNamesMutator(cfg *AltNamesMutatorConfig) (*certutil.AltNames, error) {
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etcdClientServiceDNS := fmt.Sprintf("%s.%s.svc.cluster.local", util.KarmadaEtcdClientName(cfg.Name), cfg.Namespace)
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etcdPeerServiceDNS := fmt.Sprintf("*.%s.%s.svc.cluster.local", util.KarmadaEtcdName(cfg.Name), cfg.Namespace)
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altNames := &certutil.AltNames{
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DNSNames: []string{"localhost", etcdClientServiceDNS, etcdPeerServiceDNS},
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IPs: []net.IP{net.IPv4(127, 0, 0, 1)},
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}
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if cfg.Components.Etcd.Local != nil {
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appendSANsToAltNames(altNames, cfg.Components.Etcd.Local.ServerCertSANs)
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}
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return altNames, nil
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}
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func apiServerAltNamesMutator(cfg *AltNamesMutatorConfig) (*certutil.AltNames, error) {
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altNames := &certutil.AltNames{
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DNSNames: []string{
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"localhost",
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"kubernetes",
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"kubernetes.default",
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"kubernetes.default.svc",
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fmt.Sprintf("*.%s.svc.cluster.local", constants.KarmadaSystemNamespace),
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fmt.Sprintf("*.%s.svc", constants.KarmadaSystemNamespace),
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},
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IPs: []net.IP{
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net.IPv4(127, 0, 0, 1),
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},
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}
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// When deploying a karmada under a namespace other than 'karmada-system', like 'test', there are two scenarios below：
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// 1.When karmada-apiserver access APIService, the cert of 'karmada-demo-aggregated-apiserver' will be verified to see
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// if its altNames contains 'karmada-demo-aggregated-apiserver.karmada-system.svc';
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// 2.When karmada-apiserver access webhook, the cert of 'karmada-demo-webhook' will be verified to see
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// if its altNames contains 'karmada-demo-webhook.test.svc'.
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// Therefore, the certificate's altNames should contain both 'karmada-system.svc.cluster.local' and 'test.svc.cluster.local'.
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if cfg.Namespace != constants.KarmadaSystemNamespace {
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appendSANsToAltNames(altNames, []string{fmt.Sprintf("*.%s.svc.cluster.local", cfg.Namespace),
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fmt.Sprintf("*.%s.svc", cfg.Namespace)})
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}
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if len(cfg.Components.KarmadaAPIServer.CertSANs) > 0 {
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appendSANsToAltNames(altNames, cfg.Components.KarmadaAPIServer.CertSANs)
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}
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if len(cfg.ControlplaneAddress) > 0 {
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appendSANsToAltNames(altNames, []string{cfg.ControlplaneAddress})
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}
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return altNames, nil
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}
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