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Merge pull request #10711 from eparis/self-sign-cert-san

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Do not create subject alt dns names for kubelet self signed certs
This commit is contained in:
Yu-Ju Hong 2015-07-06 11:40:34 -07:00
commit 97baadab46
3 changed files with 10 additions and 11 deletions
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6
cmd/kube-apiserver/app/server.go
View File

@ -449,7 +449,11 @@ func (s *APIServer) Run(_ []string) error {
s.TLSCertFile = path.Join(s.CertDirectory, "apiserver.crt") s.TLSCertFile = path.Join(s.CertDirectory, "apiserver.crt")
s.TLSPrivateKeyFile = path.Join(s.CertDirectory, "apiserver.key") s.TLSPrivateKeyFile = path.Join(s.CertDirectory, "apiserver.key")
// TODO (cjcullen): Is PublicAddress the right address to sign a cert with? // TODO (cjcullen): Is PublicAddress the right address to sign a cert with?
if err := util.GenerateSelfSignedCert(config.PublicAddress.String(), s.TLSCertFile, s.TLSPrivateKeyFile, config.ServiceReadWriteIP); err != nil { alternateIPs := []net.IP{config.ServiceReadWriteIP}
alternateDNS := []string{"kubernetes.default.svc", "kubernetes.default", "kubernetes"}
// It would be nice to set a fqdn subject alt name, but only the kubelets know, the apiserver is clueless
// alternateDNS = append(alternateDNS, "kubernetes.default.svc.CLUSTER.DNS.NAME")
if err := util.GenerateSelfSignedCert(config.PublicAddress.String(), s.TLSCertFile, s.TLSPrivateKeyFile, alternateIPs, alternateDNS); err != nil {
glog.Errorf("Unable to generate self signed cert: %v", err) glog.Errorf("Unable to generate self signed cert: %v", err)
} else { } else {
glog.Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile) glog.Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile)

2
cmd/kubelet/app/server.go
View File

@ -395,7 +395,7 @@ func (s *KubeletServer) InitializeTLS() (*kubelet.TLSOptions, error) {
if s.TLSCertFile == "" && s.TLSPrivateKeyFile == "" { if s.TLSCertFile == "" && s.TLSPrivateKeyFile == "" {
s.TLSCertFile = path.Join(s.CertDirectory, "kubelet.crt") s.TLSCertFile = path.Join(s.CertDirectory, "kubelet.crt")
s.TLSPrivateKeyFile = path.Join(s.CertDirectory, "kubelet.key") s.TLSPrivateKeyFile = path.Join(s.CertDirectory, "kubelet.key")
if err := util.GenerateSelfSignedCert(nodeutil.GetHostname(s.HostnameOverride), s.TLSCertFile, s.TLSPrivateKeyFile, nil); err != nil { if err := util.GenerateSelfSignedCert(nodeutil.GetHostname(s.HostnameOverride), s.TLSCertFile, s.TLSPrivateKeyFile, nil, nil); err != nil {
return nil, fmt.Errorf("unable to generate self signed cert: %v", err) return nil, fmt.Errorf("unable to generate self signed cert: %v", err)
} }
glog.V(4).Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile) glog.V(4).Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile)

13
pkg/util/crypto.go
View File

@ -35,10 +35,11 @@ import (
// GenerateSelfSignedCert creates a self-signed certificate and key for the given host. // GenerateSelfSignedCert creates a self-signed certificate and key for the given host.
// Host may be an IP or a DNS name // Host may be an IP or a DNS name
// You may also specify additional subject alt names (either ip or dns names) for the certificate
// The certificate will be created with file mode 0644. The key will be created with file mode 0600. // The certificate will be created with file mode 0644. The key will be created with file mode 0600.
// If the certificate or key files already exist, they will be overwritten. // If the certificate or key files already exist, they will be overwritten.
// Any parent directories of the certPath or keyPath will be created as needed with file mode 0755. // Any parent directories of the certPath or keyPath will be created as needed with file mode 0755.
func GenerateSelfSignedCert(host, certPath, keyPath string, ServiceReadWriteIP net.IP) error { func GenerateSelfSignedCert(host, certPath, keyPath string, alternateIPs []net.IP, alternateDNS []string) error {
priv, err := rsa.GenerateKey(rand.Reader, 2048) priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil { if err != nil {
return err return err
@ -63,14 +64,8 @@ func GenerateSelfSignedCert(host, certPath, keyPath string, ServiceReadWriteIP n
template.DNSNames = append(template.DNSNames, host) template.DNSNames = append(template.DNSNames, host)
} }
if ServiceReadWriteIP != nil { template.IPAddresses = append(template.IPAddresses, alternateIPs...)
template.IPAddresses = append(template.IPAddresses, ServiceReadWriteIP) template.DNSNames = append(template.DNSNames, alternateDNS...)
}
// It would be nice to have the next line, but only the kubelets know the fqdn, the apiserver is clueless
// template.DNSNames = append(template.DNSNames, "kubernetes.default.svc.CLUSTER.DNS.NAME")
template.DNSNames = append(template.DNSNames, "kubernetes.default.svc")
template.DNSNames = append(template.DNSNames, "kubernetes.default")
template.DNSNames = append(template.DNSNames, "kubernetes")
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv) derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil { if err != nil {