mirror of
https://github.com/k3s-io/kubernetes.git
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Dynamic SNI certificates
Reload SNI certificate cert and key file from disk every minute and notify the dynamic certificate controller when they change, allowing serving tls config to be updated.
This commit is contained in:
Jack Kleeman
parent
a3560d3ad9
commit
d9adf535f3
@ -7,6 +7,7 @@ go_library(
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"client_ca.go",
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"dynamic_cafile_content.go",
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"dynamic_serving_content.go",
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"dynamic_sni_content.go",
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"named_certificates.go",
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"static_content.go",
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"tlsconfig.go",
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@ -0,0 +1,50 @@
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/*
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Copyright 2019 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 dynamiccertificates
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// DynamicFileSNIContent provides a SNICertKeyContentProvider that can dynamically react to new file content
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type DynamicFileSNIContent struct {
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*DynamicFileServingContent
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sniNames []string
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}
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var _ Notifier = &DynamicFileSNIContent{}
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var _ SNICertKeyContentProvider = &DynamicFileSNIContent{}
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var _ ControllerRunner = &DynamicFileSNIContent{}
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// NewDynamicSNIContentFromFiles returns a dynamic SNICertKeyContentProvider based on a cert and key filename and explicit names
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func NewDynamicSNIContentFromFiles(purpose, certFile, keyFile string, sniNames ...string) (*DynamicFileSNIContent, error) {
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servingContent, err := NewDynamicServingContentFromFiles(purpose, certFile, keyFile)
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if err != nil {
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return nil, err
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}
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ret := &DynamicFileSNIContent{
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DynamicFileServingContent: servingContent,
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sniNames: sniNames,
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}
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if err := ret.loadServingCert(); err != nil {
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return nil, err
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}
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return ret, nil
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}
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// SNINames returns explicitly set SNI names for the certificate. These are not dynamic.
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func (c *DynamicFileSNIContent) SNINames() []string {
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return c.sniNames
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}
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@ -251,7 +251,7 @@ func (s *SecureServingOptions) ApplyTo(config **server.SecureServingInfo) error
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// load SNI certs
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namedTLSCerts := make([]dynamiccertificates.SNICertKeyContentProvider, 0, len(s.SNICertKeys))
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for _, nck := range s.SNICertKeys {
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tlsCert, err := dynamiccertificates.NewStaticSNICertKeyContentFromFiles(nck.CertFile, nck.KeyFile, nck.Names...)
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tlsCert, err := dynamiccertificates.NewDynamicSNIContentFromFiles("sni-serving-cert", nck.CertFile, nck.KeyFile, nck.Names...)
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namedTLSCerts = append(namedTLSCerts, tlsCert)
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if err != nil {
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return fmt.Errorf("failed to load SNI cert and key: %v", err)
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@ -96,6 +96,20 @@ func (s *SecureServingInfo) tlsConfig(stopCh <-chan struct{}) (*tls.Config, erro
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go controller.Run(1, stopCh)
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}
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for _, sniCert := range s.SNICerts {
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if notifier, ok := sniCert.(dynamiccertificates.Notifier); ok {
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notifier.AddListener(dynamicCertificateController)
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}
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if controller, ok := sniCert.(dynamiccertificates.ControllerRunner); ok {
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// runonce to be sure that we have a value.
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if err := controller.RunOnce(); err != nil {
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return nil, err
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}
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go controller.Run(1, stopCh)
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}
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}
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// runonce to be sure that we have a value.
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if err := dynamicCertificateController.RunOnce(); err != nil {
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@ -10,6 +10,7 @@ go_test(
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deps = [
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"//cmd/kube-apiserver/app/options:go_default_library",
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"//staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates:go_default_library",
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"//staging/src/k8s.io/component-base/cli/flag:go_default_library",
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"//test/integration/framework:go_default_library",
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],
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)
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@ -29,6 +29,7 @@ import (
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"time"
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"k8s.io/apiserver/pkg/server/dynamiccertificates"
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"k8s.io/component-base/cli/flag"
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"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
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"k8s.io/kubernetes/test/integration/framework"
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)
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@ -133,11 +134,7 @@ MnVCuBwfwDXCAiEAw/1TA+CjPq9JC5ek1ifR0FybTURjeQqYkKpve1dveps=
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}
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}
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func TestServingCert(t *testing.T) {
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stopCh := make(chan struct{})
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defer close(stopCh)
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var serverKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
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var serverKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
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MIIEowIBAAKCAQEA13f50PPWuR/InxLIoJjHdNSG+jVUd25CY7ZL2J023X2BAY+1
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M6jkLR6C2nSFZnn58ubiB74/d1g/Fg1Twd419iR615A013f+qOoyFx3LFHxU1S6e
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v22fgJ6ntK/+4QD5MwNgOwD8k1jN2WxHqNWn16IF4Tidbv8M9A35YHAdtYDYaOJC
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@ -165,7 +162,7 @@ TIIXXYhgSy/XshUbsgXQ+YGliye/rXSCTXHBXvWShOqxEMgeMYMRkcm8ZLp/DH7C
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kC2pemkLPUJqgSh1PASGcJbDJIvFGUfP69tUCYpHpk3nHzexuAg3
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-----END RSA PRIVATE KEY-----`)
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var serverCert = []byte(`-----BEGIN CERTIFICATE-----
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var serverCert = []byte(`-----BEGIN CERTIFICATE-----
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MIIDQDCCAiigAwIBAgIJANWw74P5KJk2MA0GCSqGSIb3DQEBCwUAMDQxMjAwBgNV
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BAMMKWdlbmVyaWNfd2ViaG9va19hZG1pc3Npb25fcGx1Z2luX3Rlc3RzX2NhMCAX
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DTE3MTExNjAwMDUzOVoYDzIyOTEwOTAxMDAwNTM5WjAjMSEwHwYDVQQDExh3ZWJo
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@ -186,6 +183,95 @@ M++C29JwS3Hwbubg6WO3wjFjoEhpCwU6qRYUz3MRp4tHO4kxKXx+oQnUiFnR7vW0
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YkNtGc1RUDHwecCTFpJtPb7Yu/E=
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-----END CERTIFICATE-----`)
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var anotherServerKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
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MIIJKAIBAAKCAgEAlZJORzCjbzF1SaCXFHyitudlE+q3Z5bGhS2TpXG6d6Laoqtw
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No4UC3i+TnMndtrP2pNkV/ZYivsp1fHz92FqFAT+XpYcG8pLm4iL0k0UufOWdLPT
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+uvcr6o8hbMYzgdKSzhRYm9C3kGcawNofqAD/Kk/zn+pMk4Bloy4UgtXFXgj2bEn
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c+kZD2jsAYV+SWjjkZjcrv/52+asd4AotRXIShV8E8xItQeq6vLHKOaIe0tC2Y44
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D3ZLWEJaMGYGsJWPMP4hni1PXSebwH5BPSn3Sl/QRcfnZJeLHXRt4cqy9uka9eKU
|
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|
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loeyHfDHsw8ia6oFfEFhnmiUg8UuTiN3HRHiOS8jqCnGoqP2KBGL+StMpkK++wH9
|
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NozEgvmL+DHpTg8zTjlrGortw4btR5FlAoIBABVni+EsGA5K/PM1gIct2pDm+6Kq
|
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UCYScTwIjftuwKLk/KqermG9QJLiJouKO3ZSz7iCelu87Dx1cKeXrc2LQ1pnQzCB
|
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JnI6BCT+zRnQFXjLokJXD2hIS2hXhqV6/9FRXLKKMYePcDxWt/etLNGmpLnhDfb3
|
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sMOH/9pnaGmtk36Ce03Hh7E1C6io/MKfTq+KKUV1UGwO1BdNQCiclkYzAUqn1O+Y
|
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c8BaeGKc2c6as8DKrPTGGQGmzo/ZUxQVfVFl2g7+HXISWBBcui/G5gtnU1afZqbW
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mTmDoqs4510vhlkhN9XZ0DyhewDIqNNGEY2vS1x2fJz1XC2Eve4KpSyUsiE=
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-----END RSA PRIVATE KEY-----
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`)
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var anotherServerCert = []byte(`-----BEGIN CERTIFICATE-----
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MIIFJjCCAw6gAwIBAgIJAOcEAbv8NslfMA0GCSqGSIb3DQEBCwUAMEAxCzAJBgNV
|
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BAYTAlVTMQswCQYDVQQIDAJDQTETMBEGA1UECgwKQWNtZSwgSW5jLjEPMA0GA1UE
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|
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|
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BgNVBAMMCWxvY2FsaG9zdDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
|
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
IBzLFnqwDS1ug/oQ1aSvc8oBh2ylKDJuGtPNqGKibNJyb2diXO/aEUOKRUKPAxKa
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||||
dbKsc4Y1bhZNN3/MICMoyghwAOiuwUQMR5uhxTkQmZUwNrPFa+eW6GvyoYLFUsZs
|
||||
hZfWLNGD5mLADElxs0HF7F9Zk6pSocTDXba4d4lfxsq88SyZZ7PbjJYFRfLQPzd1
|
||||
CfvpRPqolEmZo1Y5Q644PELYiJRKpBxmX5GtC5j5eaUD9XdGKvXsGhb0m0gW75rq
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iUnnLkZt2ya1cDJDiCnJjo7r5KxMo0XXFDc=
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-----END CERTIFICATE-----
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`)
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func TestServingCert(t *testing.T) {
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stopCh := make(chan struct{})
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defer close(stopCh)
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var servingCertPath string
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_, kubeconfig := framework.StartTestServer(t, stopCh, framework.TestServerSetup{
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@ -253,3 +339,108 @@ YkNtGc1RUDHwecCTFpJtPb7Yu/E=
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}
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}
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}
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func TestSNICert(t *testing.T) {
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stopCh := make(chan struct{})
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defer close(stopCh)
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var servingCertPath string
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_, kubeconfig := framework.StartTestServer(t, stopCh, framework.TestServerSetup{
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ModifyServerRunOptions: func(opts *options.ServerRunOptions) {
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opts.GenericServerRunOptions.MaxRequestBodyBytes = 1024 * 1024
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servingCertPath = opts.SecureServing.ServerCert.CertDirectory
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if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.key"), anotherServerKey, 0644); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.crt"), anotherServerCert, 0644); err != nil {
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t.Fatal(err)
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}
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dynamiccertificates.FileRefreshDuration = 1 * time.Second
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opts.SecureServing.SNICertKeys = []flag.NamedCertKey{{
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Names: []string{"foo"},
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CertFile: path.Join(servingCertPath, "foo.crt"),
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KeyFile: path.Join(servingCertPath, "foo.key"),
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}}
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},
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})
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apiserverURL, err := url.Parse(kubeconfig.Host)
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if err != nil {
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t.Fatal(err)
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}
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// When we run this the second time, we know which one we are expecting.
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acceptableCerts := [][]byte{}
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tlsConfig := &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
|
||||
acceptableCerts = make([][]byte, 0, len(rawCerts))
|
||||
for _, r := range rawCerts {
|
||||
acceptableCerts = append(acceptableCerts, r)
|
||||
}
|
||||
return nil
|
||||
},
|
||||
ServerName: "foo",
|
||||
}
|
||||
|
||||
conn, err := tls.Dial("tcp", apiserverURL.Host, tlsConfig)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
conn.Close()
|
||||
|
||||
cert, err := tls.LoadX509KeyPair(path.Join(servingCertPath, "foo.crt"), path.Join(servingCertPath, "foo.key"))
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
expectedCerts := cert.Certificate
|
||||
if len(expectedCerts) != len(acceptableCerts) {
|
||||
var certs []string
|
||||
for _, a := range acceptableCerts {
|
||||
certs = append(certs, base64.StdEncoding.EncodeToString(a))
|
||||
}
|
||||
t.Fatalf("Unexpected number of certs: %v", strings.Join(certs, ":"))
|
||||
}
|
||||
for i := range expectedCerts {
|
||||
if !bytes.Equal(acceptableCerts[i], expectedCerts[i]) {
|
||||
t.Errorf("expected %q, got %q", base64.StdEncoding.EncodeToString(expectedCerts[i]), base64.StdEncoding.EncodeToString(acceptableCerts[i]))
|
||||
}
|
||||
}
|
||||
|
||||
if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.key"), serverKey, 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.crt"), serverCert, 0644); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
time.Sleep(4 * time.Second)
|
||||
|
||||
conn2, err := tls.Dial("tcp", apiserverURL.Host, tlsConfig)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
conn2.Close()
|
||||
|
||||
cert, err = tls.X509KeyPair(serverCert, serverKey)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
expectedCerts = cert.Certificate
|
||||
if len(expectedCerts) != len(acceptableCerts) {
|
||||
var certs []string
|
||||
for _, a := range acceptableCerts {
|
||||
certs = append(certs, base64.StdEncoding.EncodeToString(a))
|
||||
}
|
||||
t.Fatalf("Unexpected number of certs: %v", strings.Join(certs, ":"))
|
||||
}
|
||||
for i := range expectedCerts {
|
||||
if !bytes.Equal(acceptableCerts[i], expectedCerts[i]) {
|
||||
t.Errorf("expected %q, got %q", base64.StdEncoding.EncodeToString(expectedCerts[i]), base64.StdEncoding.EncodeToString(acceptableCerts[i]))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user