103 lines
3.2 KiB
Go
103 lines
3.2 KiB
Go
|
/*
|
||
|
|
Copyright 2019 The Kubernetes Authors.
|
||
|
|
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package cert
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/tls"
|
||
|
|
"crypto/x509"
|
||
|
|
"fmt"
|
||
|
|
"net/url"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
// GetClientCANames gets the CA names for client certs that a server accepts. This is useful when inspecting the
|
||
|
|
// state of particular servers. apiHost is "host:port"
|
||
|
|
func GetClientCANames(apiHost string) ([]string, error) {
|
||
|
|
// when we run this the second time, we know which one we are expecting
|
||
|
|
acceptableCAs := []string{}
|
||
|
|
tlsConfig := &tls.Config{
|
||
|
|
InsecureSkipVerify: true, // this is insecure to always get to the GetClientCertificate
|
||
|
|
GetClientCertificate: func(hello *tls.CertificateRequestInfo) (*tls.Certificate, error) {
|
||
|
|
acceptableCAs = []string{}
|
||
|
|
for _, curr := range hello.AcceptableCAs {
|
||
|
|
acceptableCAs = append(acceptableCAs, string(curr))
|
||
|
|
}
|
||
|
|
return &tls.Certificate{}, nil
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
conn, err := tls.Dial("tcp", apiHost, tlsConfig)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if err := conn.Close(); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return acceptableCAs, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// GetClientCANamesForURL is GetClientCANames against a URL string like we use in kubeconfigs
|
||
|
|
func GetClientCANamesForURL(kubeConfigURL string) ([]string, error) {
|
||
|
|
apiserverURL, err := url.Parse(kubeConfigURL)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return GetClientCANames(apiserverURL.Host)
|
||
|
|
}
|
||
|
|
|
||
|
|
// GetServingCertificates returns the x509 certs used by a server as certificates and pem encoded bytes.
|
||
|
|
// The serverName is optional for specifying a different name to get SNI certificates. apiHost is "host:port"
|
||
|
|
func GetServingCertificates(apiHost, serverName string) ([]*x509.Certificate, [][]byte, error) {
|
||
|
|
tlsConfig := &tls.Config{
|
||
|
|
InsecureSkipVerify: true, // this is insecure so that we always get connected
|
||
|
|
}
|
||
|
|
// if a name is specified for SNI, set it.
|
||
|
|
if len(serverName) > 0 {
|
||
|
|
tlsConfig.ServerName = serverName
|
||
|
|
}
|
||
|
|
|
||
|
|
conn, err := tls.Dial("tcp", apiHost, tlsConfig)
|
||
|
|
if err != nil {
|
||
|
|
return nil, nil, err
|
||
|
|
}
|
||
|
|
if err = conn.Close(); err != nil {
|
||
|
|
return nil, nil, fmt.Errorf("failed to close connection : %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
peerCerts := conn.ConnectionState().PeerCertificates
|
||
|
|
peerCertBytes := [][]byte{}
|
||
|
|
for _, a := range peerCerts {
|
||
|
|
actualCert, err := EncodeCertificates(a)
|
||
|
|
if err != nil {
|
||
|
|
return nil, nil, err
|
||
|
|
}
|
||
|
|
peerCertBytes = append(peerCertBytes, []byte(strings.TrimSpace(string(actualCert))))
|
||
|
|
}
|
||
|
|
|
||
|
|
return peerCerts, peerCertBytes, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// GetServingCertificatesForURL is GetServingCertificates against a URL string like we use in kubeconfigs
|
||
|
|
func GetServingCertificatesForURL(kubeConfigURL, serverName string) ([]*x509.Certificate, [][]byte, error) {
|
||
|
|
apiserverURL, err := url.Parse(kubeConfigURL)
|
||
|
|
if err != nil {
|
||
|
|
return nil, nil, err
|
||
|
|
}
|
||
|
|
return GetServingCertificates(apiserverURL.Host, serverName)
|
||
|
|
}
|