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https://github.com/kyverno/kyverno.git
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flag to use FQDN as CommonName in CSR
This commit is contained in:
shivkumar dudhani
parent
622d007e18
commit
38dcb2e94f
3 changed files with 34 additions and 28 deletions
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@ -27,12 +27,12 @@ import (
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var (
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kubeconfig string
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serverIP string
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cpu bool
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memory bool
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webhookTimeout int
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//TODO: this has been added to backward support command line arguments
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// will be removed in future and the configuration will be set only via configmaps
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filterK8Resources string
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// User FQDN as CSR CN
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FQDNCN bool
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)
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func main() {
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@ -168,7 +168,7 @@ func main() {
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policyMetaStore)
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// CONFIGURE CERTIFICATES
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tlsPair, err := client.InitTLSPemPair(clientConfig)
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tlsPair, err := client.InitTLSPemPair(clientConfig, FQDNCN)
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if err != nil {
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glog.Fatalf("Failed to initialize TLS key/certificate pair: %v\n", err)
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}
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@ -246,6 +246,8 @@ func init() {
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flag.IntVar(&webhookTimeout, "webhooktimeout", 3, "timeout for webhook configurations")
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flag.StringVar(&kubeconfig, "kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
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flag.StringVar(&serverIP, "serverIP", "", "IP address where Kyverno controller runs. Only required if out-of-cluster.")
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// Generate CSR with CN as FQDN due to https://github.com/nirmata/kyverno/issues/542
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flag.BoolVar(&FQDNCN, "FQDNAsCN", false, "use FQDN as Common Name in CSR")
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config.LogDefaultFlags()
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flag.Parse()
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}
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@ -18,15 +18,15 @@ import (
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// InitTLSPemPair Loads or creates PEM private key and TLS certificate for webhook server.
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// Created pair is stored in cluster's secret.
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// Returns struct with key/certificate pair.
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func (c *Client) InitTLSPemPair(configuration *rest.Config) (*tls.TlsPemPair, error) {
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func (c *Client) InitTLSPemPair(configuration *rest.Config, FQDNCN bool) (*tls.TlsPemPair, error) {
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certProps, err := c.GetTLSCertProps(configuration)
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if err != nil {
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return nil, err
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}
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tlsPair := c.ReadTlsPair(certProps)
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if tls.IsTlsPairShouldBeUpdated(tlsPair) {
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if tls.IsTLSPairShouldBeUpdated(tlsPair) {
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glog.Info("Generating new key/certificate pair for TLS")
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tlsPair, err = c.GenerateTlsPemPair(certProps)
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tlsPair, err = c.generateTLSPemPair(certProps, FQDNCN)
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if err != nil {
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return nil, err
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}
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@ -40,15 +40,15 @@ func (c *Client) InitTLSPemPair(configuration *rest.Config) (*tls.TlsPemPair, er
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return tlsPair, nil
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}
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//GenerateTlsPemPair Issues TLS certificate for webhook server using given PEM private key
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//generateTlsPemPair Issues TLS certificate for webhook server using given PEM private key
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// Returns signed and approved TLS certificate in PEM format
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func (c *Client) GenerateTlsPemPair(props tls.TlsCertificateProps) (*tls.TlsPemPair, error) {
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privateKey, err := tls.TlsGeneratePrivateKey()
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func (c *Client) generateTLSPemPair(props tls.TlsCertificateProps, FQDNCN bool) (*tls.TlsPemPair, error) {
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privateKey, err := tls.TLSGeneratePrivateKey()
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if err != nil {
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return nil, err
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}
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certRequest, err := tls.TlsCertificateGenerateRequest(privateKey, props)
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certRequest, err := tls.CertificateGenerateRequest(privateKey, props, FQDNCN)
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if err != nil {
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return nil, fmt.Errorf("Unable to create certificate request: %v", err)
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}
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@ -65,7 +65,7 @@ func (c *Client) GenerateTlsPemPair(props tls.TlsCertificateProps) (*tls.TlsPemP
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return &tls.TlsPemPair{
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Certificate: tlsCert,
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PrivateKey: tls.TlsPrivateKeyToPem(privateKey),
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PrivateKey: tls.TLSPrivateKeyToPem(privateKey),
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}, nil
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}
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@ -27,13 +27,13 @@ type TlsPemPair struct {
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PrivateKey []byte
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}
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//TlsGeneratePrivateKey Generates RSA private key
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func TlsGeneratePrivateKey() (*rsa.PrivateKey, error) {
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//TLSGeneratePrivateKey Generates RSA private key
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func TLSGeneratePrivateKey() (*rsa.PrivateKey, error) {
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return rsa.GenerateKey(rand.Reader, 2048)
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}
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//TlsPrivateKeyToPem Creates PEM block from private key object
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func TlsPrivateKeyToPem(rsaKey *rsa.PrivateKey) []byte {
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//TLSPrivateKeyToPem Creates PEM block from private key object
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func TLSPrivateKeyToPem(rsaKey *rsa.PrivateKey) []byte {
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privateKey := &pem.Block{
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Type: "PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(rsaKey),
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@ -43,7 +43,7 @@ func TlsPrivateKeyToPem(rsaKey *rsa.PrivateKey) []byte {
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}
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//TlsCertificateRequestToPem Creates PEM block from raw certificate request
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func TlsCertificateRequestToPem(csrRaw []byte) []byte {
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func certificateRequestToPem(csrRaw []byte) []byte {
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csrBlock := &pem.Block{
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Type: "CERTIFICATE REQUEST",
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Bytes: csrRaw,
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@ -52,26 +52,30 @@ func TlsCertificateRequestToPem(csrRaw []byte) []byte {
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return pem.EncodeToMemory(csrBlock)
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}
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//TlsCertificateGenerateRequest Generates raw certificate signing request
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func TlsCertificateGenerateRequest(privateKey *rsa.PrivateKey, props TlsCertificateProps) (*certificates.CertificateSigningRequest, error) {
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//CertificateGenerateRequest Generates raw certificate signing request
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func CertificateGenerateRequest(privateKey *rsa.PrivateKey, props TlsCertificateProps, FQDNCN bool) (*certificates.CertificateSigningRequest, error) {
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dnsNames := make([]string, 3)
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dnsNames[0] = props.Service
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dnsNames[1] = props.Service + "." + props.Namespace
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// The full service name is the CommonName for the certificate
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commonName := GenerateInClusterServiceName(props)
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dnsNames[2] = commonName
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csCommonName := props.Service
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if FQDNCN {
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// use FQDN as CommonName as a workaournd for https://github.com/nirmata/kyverno/issues/542
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csCommonName = commonName
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}
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var ips []net.IP
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apiServerIp := net.ParseIP(props.ApiServerHost)
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if apiServerIp != nil {
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ips = append(ips, apiServerIp)
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apiServerIP := net.ParseIP(props.ApiServerHost)
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if apiServerIP != nil {
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ips = append(ips, apiServerIP)
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} else {
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dnsNames = append(dnsNames, props.ApiServerHost)
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}
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csrTemplate := x509.CertificateRequest{
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Subject: pkix.Name{
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CommonName: props.Service, //commonName,
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CommonName: csCommonName,
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},
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SignatureAlgorithm: x509.SHA256WithRSA,
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DNSNames: dnsNames,
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@ -92,7 +96,7 @@ func TlsCertificateGenerateRequest(privateKey *rsa.PrivateKey, props TlsCertific
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Name: props.Service + "." + props.Namespace + ".cert-request",
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},
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Spec: certificates.CertificateSigningRequestSpec{
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Request: TlsCertificateRequestToPem(csrBytes),
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Request: certificateRequestToPem(csrBytes),
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Groups: []string{"system:masters", "system:authenticated"},
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Usages: []certificates.KeyUsage{
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certificates.UsageDigitalSignature,
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@ -110,7 +114,7 @@ func GenerateInClusterServiceName(props TlsCertificateProps) string {
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}
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//TlsCertificateGetExpirationDate Gets NotAfter property from raw certificate
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func TlsCertificateGetExpirationDate(certData []byte) (*time.Time, error) {
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func tlsCertificateGetExpirationDate(certData []byte) (*time.Time, error) {
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block, _ := pem.Decode(certData)
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if block == nil {
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return nil, errors.New("Failed to decode PEM")
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@ -127,13 +131,13 @@ func TlsCertificateGetExpirationDate(certData []byte) (*time.Time, error) {
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// an expired certificate in a controller that has been running for a long time
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const timeReserveBeforeCertificateExpiration time.Duration = time.Hour * 24 * 30 * 6 // About half a year
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//IsTlsPairShouldBeUpdated checks if TLS pair has expited and needs to be updated
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func IsTlsPairShouldBeUpdated(tlsPair *TlsPemPair) bool {
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//IsTLSPairShouldBeUpdated checks if TLS pair has expited and needs to be updated
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func IsTLSPairShouldBeUpdated(tlsPair *TlsPemPair) bool {
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if tlsPair == nil {
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return true
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}
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expirationDate, err := TlsCertificateGetExpirationDate(tlsPair.Certificate)
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expirationDate, err := tlsCertificateGetExpirationDate(tlsPair.Certificate)
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if err != nil {
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return true
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}
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