Merge pull request #354 from iyalang/feature/add-cert-auth

add TLS auth for accessing Prometheus

cmd/adapter/adapter.go

@@ -62,6 +62,10 @@ type PrometheusAdapter struct {
 	PrometheusAuthConf string
 	// PrometheusCAFile points to the file containing the ca-root for connecting with Prometheus
 	PrometheusCAFile string
+	// PrometheusClientTLSCertFile points to the file containing the client TLS cert for connecting with Prometheus
+	PrometheusClientTLSCertFile string
+	// PrometheusClientTLSKeyFile points to the file containing the client TLS key for connecting with Prometheus
+	PrometheusClientTLSKeyFile string
 	// PrometheusTokenFile points to the file that contains the bearer token when connecting with Prometheus
 	PrometheusTokenFile string
 	// AdapterConfigFile points to the file containing the metrics discovery configuration.
@@ -83,7 +87,7 @@ func (cmd *PrometheusAdapter) makePromClient() (prom.Client, error) {
 	var httpClient *http.Client
 
 	if cmd.PrometheusCAFile != "" {
-		prometheusCAClient, err := makePrometheusCAClient(cmd.PrometheusCAFile)
+		prometheusCAClient, err := makePrometheusCAClient(cmd.PrometheusCAFile, cmd.PrometheusClientTLSCertFile, cmd.PrometheusClientTLSKeyFile)
 		if err != nil {
 			return nil, err
 		}
@@ -120,6 +124,10 @@ func (cmd *PrometheusAdapter) addFlags() {
 		"kubeconfig file used to configure auth when connecting to Prometheus.")
 	cmd.Flags().StringVar(&cmd.PrometheusCAFile, "prometheus-ca-file", cmd.PrometheusCAFile,
 		"Optional CA file to use when connecting with Prometheus")
+	cmd.Flags().StringVar(&cmd.PrometheusClientTLSCertFile, "prometheus-client-tls-cert-file", cmd.PrometheusClientTLSCertFile,
+		"Optional client TLS cert file to use when connecting with Prometheus, auto-renewal is not supported")
+	cmd.Flags().StringVar(&cmd.PrometheusClientTLSKeyFile, "prometheus-client-tls-key-file", cmd.PrometheusClientTLSKeyFile,
+		"Optional client TLS key file to use when connecting with Prometheus, auto-renewal is not supported")
 	cmd.Flags().StringVar(&cmd.PrometheusTokenFile, "prometheus-token-file", cmd.PrometheusTokenFile,
 		"Optional file containing the bearer token to use when connecting with Prometheus")
 	cmd.Flags().StringVar(&cmd.AdapterConfigFile, "config", cmd.AdapterConfigFile,
@@ -340,8 +348,8 @@ func makeKubeconfigHTTPClient(inClusterAuth bool, kubeConfigPath string) (*http.
 	return &http.Client{Transport: tr}, nil
 }
 
-func makePrometheusCAClient(caFilename string) (*http.Client, error) {
+func makePrometheusCAClient(caFilePath string, tlsCertFilePath string, tlsKeyFilePath string) (*http.Client, error) {
-	data, err := ioutil.ReadFile(caFilename)
+	data, err := ioutil.ReadFile(caFilePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read prometheus-ca-file: %v", err)
 	}
@@ -351,6 +359,21 @@ func makePrometheusCAClient(caFilename string) (*http.Client, error) {
 		return nil, fmt.Errorf("no certs found in prometheus-ca-file")
 	}
 
+	if (tlsCertFilePath != "") && (tlsKeyFilePath != "") {
+		tlsClientCerts, err := tls.LoadX509KeyPair(tlsCertFilePath, tlsKeyFilePath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read TLS key pair: %v", err)
+		}
+		return &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{
+					RootCAs:      pool,
+					Certificates: []tls.Certificate{tlsClientCerts},
+				},
+			},
+		}, nil
+	}
+
 	return &http.Client{
 		Transport: &http.Transport{
 			TLSClientConfig: &tls.Config{

cmd/adapter/adapter_test.go

@@ -0,0 +1,148 @@
+/*
+Copyright 2016 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 main
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+const certsDir = "testdata"
+
+func TestMakeKubeconfigHTTPClient(t *testing.T) {
+
+	tests := []struct {
+		kubeconfigPath string
+		inClusterAuth  bool
+		success        bool
+	}{
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig"),
+			inClusterAuth:  false,
+			success:        true,
+		},
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig"),
+			inClusterAuth:  true,
+			success:        false,
+		},
+		{
+			kubeconfigPath: filepath.Join(certsDir, "kubeconfig-error"),
+			inClusterAuth:  false,
+			success:        false,
+		},
+		{
+			kubeconfigPath: "",
+			inClusterAuth:  false,
+			success:        true,
+		},
+	}
+
+	os.Setenv("KUBERNETES_SERVICE_HOST", "prometheus")
+	os.Setenv("KUBERNETES_SERVICE_PORT", "8080")
+
+	for _, test := range tests {
+		t.Logf("Running test for: inClusterAuth %v, kubeconfigPath %v", test.inClusterAuth, test.kubeconfigPath)
+		kubeconfigHTTPClient, err := makeKubeconfigHTTPClient(test.inClusterAuth, test.kubeconfigPath)
+		if test.success {
+			if err != nil {
+				t.Errorf("Error is %v, expected nil", err)
+				continue
+			}
+			if kubeconfigHTTPClient.Transport == nil {
+				if test.inClusterAuth || test.kubeconfigPath != "" {
+					t.Error("HTTP client Transport is nil, expected http.RoundTripper")
+				}
+			}
+		} else {
+			if err == nil {
+				t.Errorf("Error is nil, expected %v", err)
+			}
+		}
+	}
+}
+
+func TestMakePrometheusCAClient(t *testing.T) {
+
+	tests := []struct {
+		caFilePath      string
+		tlsCertFilePath string
+		tlsKeyFilePath  string
+		success         bool
+		tlsUsed         bool
+	}{
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         true,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca-error.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         false,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: filepath.Join(certsDir, "tlscert-error.crt"),
+			tlsKeyFilePath:  filepath.Join(certsDir, "tlskey.key"),
+			success:         false,
+			tlsUsed:         true,
+		},
+		{
+			caFilePath:      filepath.Join(certsDir, "ca.pem"),
+			tlsCertFilePath: "",
+			tlsKeyFilePath:  "",
+			success:         true,
+			tlsUsed:         false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Logf("Running test for: caFilePath %v, tlsCertFilePath %v, tlsKeyFilePath %v", test.caFilePath, test.tlsCertFilePath, test.tlsKeyFilePath)
+		prometheusCAClient, err := makePrometheusCAClient(test.caFilePath, test.tlsCertFilePath, test.tlsKeyFilePath)
+		if test.success {
+			if err != nil {
+				t.Errorf("Error is %v, expected nil", err)
+				continue
+			}
+			if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.RootCAs == nil {
+				t.Error("RootCAs is nil, expected *x509.CertPool")
+				continue
+			}
+			if test.tlsUsed {
+				if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates == nil {
+					t.Error("TLS certificates is nil, expected []tls.Certificate")
+					continue
+				}
+			} else {
+				if prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates != nil {
+					t.Errorf("TLS certificates is %+v, expected nil", prometheusCAClient.Transport.(*http.Transport).TLSClientConfig.Certificates)
+				}
+			}
+		} else {
+			if err == nil {
+				t.Errorf("Error is nil, expected %v", err)
+			}
+		}
+	}
+}

cmd/adapter/testdata/ca-error.pem

@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE-----
+MIIDdjCCAl4CCQDdbOsYxSKoeDANBgkqhkiG9w0BAQsFADB9MQswCQYDVQQGEwJV
+UzENMAsGA1UEBwwEVGVzdDEaMBgGA1UECgwRUHJvbWV0aGV1c0FkYXB0ZXIxJDAi
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+-----END CERTIFICATE-----

cmd/adapter/testdata/ca.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDLjCCAhYCCQDlnNCOw7JHFDANBgkqhkiG9w0BAQsFADBYMQswCQYDVQQGEwJV
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+Ldc=
+-----END CERTIFICATE-----

cmd/adapter/testdata/kubeconfig

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Config
+clusters:
+- name: test
+  cluster:
+    certificate-authority-data: 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
+    server: test.test
+contexts:
+- name: test
+  context:
+    cluster: test
+    user: test-user
+current-context: test
+users:
+- name: test-user
+  user:
+    token: abcde12345

cmd/adapter/testdata/kubeconfig-error

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Config
+clusters:
+- name: test
+  cluster:
+    certificate-authority-data: abcde12345
+    server: test.test
+contexts:
+- name: test
+  context:
+    cluster: test
+    user: test-user
+current-context: test
+users:
+- name: test-user
+  user:
+    token: abcde12345
+

cmd/adapter/testdata/tlscert-error.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

cmd/adapter/testdata/tlscert.crt

@@ -0,0 +1,30 @@
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+LVLoVFFp7RaGSIECcqTyXldoZZpZrA89XDVuqSvHDiCOrg==
+-----END CERTIFICATE-----

cmd/adapter/testdata/tlskey.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+LeU1NmvuCRmWmrgEkqiKs3jgjbEPVQI=
+-----END PRIVATE KEY-----