Merge pull request #84303 from jackkleeman/dynamic-sni-cert

Dynamic SNI certificates

test/integration/apiserver/certreload/BUILD

@@ -10,6 +10,7 @@ go_test(
     deps = [
         "//cmd/kube-apiserver/app/options:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/server/dynamiccertificates:go_default_library",
+        "//staging/src/k8s.io/component-base/cli/flag:go_default_library",
         "//test/integration/framework:go_default_library",
     ],
 )

test/integration/apiserver/certreload/certreload_test.go

@@ -29,6 +29,7 @@ import (
 	"time"
 
 	"k8s.io/apiserver/pkg/server/dynamiccertificates"
+	"k8s.io/component-base/cli/flag"
 	"k8s.io/kubernetes/cmd/kube-apiserver/app/options"
 	"k8s.io/kubernetes/test/integration/framework"
 )
@@ -133,11 +134,7 @@ MnVCuBwfwDXCAiEAw/1TA+CjPq9JC5ek1ifR0FybTURjeQqYkKpve1dveps=
 	}
 }
 
-func TestServingCert(t *testing.T) {
-	stopCh := make(chan struct{})
-	defer close(stopCh)
-
-	var serverKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
+var serverKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
 MIIEowIBAAKCAQEA13f50PPWuR/InxLIoJjHdNSG+jVUd25CY7ZL2J023X2BAY+1
 M6jkLR6C2nSFZnn58ubiB74/d1g/Fg1Twd419iR615A013f+qOoyFx3LFHxU1S6e
 v22fgJ6ntK/+4QD5MwNgOwD8k1jN2WxHqNWn16IF4Tidbv8M9A35YHAdtYDYaOJC
@@ -165,7 +162,7 @@ TIIXXYhgSy/XshUbsgXQ+YGliye/rXSCTXHBXvWShOqxEMgeMYMRkcm8ZLp/DH7C
 kC2pemkLPUJqgSh1PASGcJbDJIvFGUfP69tUCYpHpk3nHzexuAg3
 -----END RSA PRIVATE KEY-----`)
 
-	var serverCert = []byte(`-----BEGIN CERTIFICATE-----
+var serverCert = []byte(`-----BEGIN CERTIFICATE-----
 MIIDQDCCAiigAwIBAgIJANWw74P5KJk2MA0GCSqGSIb3DQEBCwUAMDQxMjAwBgNV
 BAMMKWdlbmVyaWNfd2ViaG9va19hZG1pc3Npb25fcGx1Z2luX3Rlc3RzX2NhMCAX
 DTE3MTExNjAwMDUzOVoYDzIyOTEwOTAxMDAwNTM5WjAjMSEwHwYDVQQDExh3ZWJo
@@ -186,6 +183,95 @@ M++C29JwS3Hwbubg6WO3wjFjoEhpCwU6qRYUz3MRp4tHO4kxKXx+oQnUiFnR7vW0
 YkNtGc1RUDHwecCTFpJtPb7Yu/E=
 -----END CERTIFICATE-----`)
 
+var anotherServerKey = []byte(`-----BEGIN RSA PRIVATE KEY-----
+MIIJKAIBAAKCAgEAlZJORzCjbzF1SaCXFHyitudlE+q3Z5bGhS2TpXG6d6Laoqtw
+No4UC3i+TnMndtrP2pNkV/ZYivsp1fHz92FqFAT+XpYcG8pLm4iL0k0UufOWdLPT
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+FciTLJEH0+iwqMe9OXDjQ/rfYcfXw/7QezNZYFNF2RT3wWnfqdQduXrkig3sfotx
+oCfJzgf2E0WPu/Y/CxyRqVzXF5N/7zxkX2gYF0YpQCmX5afz+X4FlTju81lT9DyL
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+D3ZLWEJaMGYGsJWPMP4hni1PXSebwH5BPSn3Sl/QRcfnZJeLHXRt4cqy9uka9eKU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=
+-----END RSA PRIVATE KEY-----
+`)
+
+var anotherServerCert = []byte(`-----BEGIN CERTIFICATE-----
+MIIFJjCCAw6gAwIBAgIJAOcEAbv8NslfMA0GCSqGSIb3DQEBCwUAMEAxCzAJBgNV
+BAYTAlVTMQswCQYDVQQIDAJDQTETMBEGA1UECgwKQWNtZSwgSW5jLjEPMA0GA1UE
+AwwGc29tZUNBMCAXDTE4MDYwODEzMzkyNFoYDzIyMTgwNDIxMTMzOTI0WjBDMQsw
+CQYDVQQGEwJVUzELMAkGA1UECAwCQ0ExEzARBgNVBAoMCkFjbWUsIEluYy4xEjAQ
+BgNVBAMMCWxvY2FsaG9zdDCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIB
+AJWSTkcwo28xdUmglxR8orbnZRPqt2eWxoUtk6Vxunei2qKrcDaOFAt4vk5zJ3ba
+z9qTZFf2WIr7KdXx8/dhahQE/l6WHBvKS5uIi9JNFLnzlnSz01/OxwiYymeK+35s
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+CfvpRPqolEmZo1Y5Q644PELYiJRKpBxmX5GtC5j5eaUD9XdGKvXsGhb0m0gW75rq
+iUnnLkZt2ya1cDJDiCnJjo7r5KxMo0XXFDc=
+-----END CERTIFICATE-----
+`)
+
+func TestServingCert(t *testing.T) {
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+
 	var servingCertPath string
 
 	_, kubeconfig := framework.StartTestServer(t, stopCh, framework.TestServerSetup{
@@ -253,3 +339,108 @@ YkNtGc1RUDHwecCTFpJtPb7Yu/E=
 		}
 	}
 }
+
+func TestSNICert(t *testing.T) {
+	stopCh := make(chan struct{})
+	defer close(stopCh)
+
+	var servingCertPath string
+
+	_, kubeconfig := framework.StartTestServer(t, stopCh, framework.TestServerSetup{
+		ModifyServerRunOptions: func(opts *options.ServerRunOptions) {
+			opts.GenericServerRunOptions.MaxRequestBodyBytes = 1024 * 1024
+			servingCertPath = opts.SecureServing.ServerCert.CertDirectory
+
+			if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.key"), anotherServerKey, 0644); err != nil {
+				t.Fatal(err)
+			}
+			if err := ioutil.WriteFile(path.Join(servingCertPath, "foo.crt"), anotherServerCert, 0644); err != nil {
+				t.Fatal(err)
+			}
+
+			dynamiccertificates.FileRefreshDuration = 1 * time.Second
+			opts.SecureServing.SNICertKeys = []flag.NamedCertKey{{
+				Names:    []string{"foo"},
+				CertFile: path.Join(servingCertPath, "foo.crt"),
+				KeyFile:  path.Join(servingCertPath, "foo.key"),
+			}}
+		},
+	})
+	apiserverURL, err := url.Parse(kubeconfig.Host)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// When we run this the second time, we know which one we are expecting.
+	acceptableCerts := [][]byte{}
+	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]))
+		}
+	}
+}