Ability to connect to an endpoint that is protected by HTTP authentication and/or SSL Client Certificates

cmd/php-fpm-exporter/main.go

@@ -13,6 +13,7 @@ func main() {
 		endpoint        = kingpin.Flag("endpoint", "url for php-fpm status").Default("http://127.0.0.1:9000/status").String()
 		fcgiEndpoint    = kingpin.Flag("fastcgi", "fastcgi url. If this is set, fastcgi will be used instead of HTTP").String()
 		metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics. Cannot be /").Default("/metrics").String()
+		authConfigFile  = kingpin.Flag("auth.config", "Configuration file with authentication information, i.e. HTTP Auth and TLS client certificates").Default("").String()
 	)
 
 	kingpin.HelpFlag.Short('h')
@@ -29,6 +30,7 @@ func main() {
 		exporter.SetFastcgi(*fcgiEndpoint),
 		exporter.SetLogger(logger),
 		exporter.SetMetricsEndpoint(*metricsEndpoint),
+		exporter.SetAuthConfig(*authConfigFile),
 	)
 
 	if err != nil {

collector.go

@@ -1,6 +1,7 @@
 package exporter
 
 import (
+	"crypto/tls"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -112,7 +113,7 @@ func getDataFastcgi(u *url.URL) ([]byte, error) {
 	return body, nil
 }
 
-func getDataHTTP(u *url.URL) ([]byte, error) {
+func (c *collector) getDataHTTP(u *url.URL) ([]byte, error) {
 	req := http.Request{
 		Method:     "GET",
 		URL:        u,
@@ -123,7 +124,30 @@ func getDataHTTP(u *url.URL) ([]byte, error) {
 		Host:       u.Host,
 	}
 
-	resp, err := http.DefaultClient.Do(&req)
+	var client *http.Client
+	if c.exporter.authConfig.ClientCert != "" {
+		cert, err := tls.LoadX509KeyPair(c.exporter.authConfig.ClientCert, c.exporter.authConfig.ClientKey)
+		if err != nil {
+			return nil, errors.Wrap(err, "Could not load cert and/or key")
+		}
+
+		client = &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: &tls.Config{
+					Certificates:       []tls.Certificate{cert},
+					InsecureSkipVerify: c.exporter.authConfig.AllowInsecureServerCert,
+				},
+			},
+		}
+	} else {
+		client = http.DefaultClient
+	}
+
+	if c.exporter.authConfig.AuthUser != "" {
+		req.SetBasicAuth(c.exporter.authConfig.AuthUser, c.exporter.authConfig.AuthPass)
+	}
+
+	resp, err := client.Do(&req)
 	if err != nil {
 		return nil, errors.Wrap(err, "HTTP request failed")
 	}
@@ -152,7 +176,7 @@ func (c *collector) Collect(ch chan<- prometheus.Metric) {
 	if c.exporter.fcgiEndpoint != nil && c.exporter.fcgiEndpoint.String() != "" {
 		body, err = getDataFastcgi(c.exporter.fcgiEndpoint)
 	} else {
-		body, err = getDataHTTP(c.exporter.endpoint)
+		body, err = c.getDataHTTP(c.exporter.endpoint)
 	}
 
 	if err != nil {

exporter.go

@@ -2,6 +2,8 @@ package exporter
 
 import (
 	"context"
+	"gopkg.in/yaml.v2"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -17,13 +19,23 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
+// AuthenticationConfiguration is the in-memory, decoded representation of the authentication configuration file
+type AuthenticationConfiguration struct {
+	ClientCert              string `yaml:"clientcert"`
+	ClientKey               string `yaml:"clientkey"`
+	AllowInsecureServerCert bool   `yaml:"allow_insecure_server_cert"`
+	AuthUser                string `yaml:"authuser"`
+	AuthPass                string `yaml:"authpass"`
+}
+
 // Exporter handles serving the metrics
 type Exporter struct {
 	addr            string
 	endpoint        *url.URL
 	fcgiEndpoint    *url.URL
 	logger          *zap.Logger
 	metricsEndpoint string
+	authConfig      AuthenticationConfiguration
 }
 
 // OptionsFunc is a function passed to new for setting options on a new Exporter.
@@ -124,6 +136,38 @@ func SetMetricsEndpoint(path string) func(*Exporter) error {
 	}
 }
 
+//SetAuthConfig sets the authentication configuration for connecting to the endpoint(s)
+//Generally only used when creating a new Exporter.
+func SetAuthConfig(authConfigFile string) func(*Exporter) error {
+	return func(e *Exporter) error {
+		if authConfigFile != "" {
+			authConfig, err := readAuthConfig(authConfigFile)
+			if err != nil {
+				return errors.Wrap(err, "failed to read authentication configuration file")
+			}
+			e.authConfig = authConfig
+		}
+		return nil
+	}
+}
+
+//readAuthConfig reads authentication configuration from auth.config file passed as command-line parameter
+func readAuthConfig(authConfigFile string) (AuthenticationConfiguration, error) {
+
+	var authConfig AuthenticationConfiguration
+
+	yamlString, err := ioutil.ReadFile(authConfigFile)
+	if err != nil {
+		return authConfig, errors.Wrap(err, "failed to read authentication configuration file")
+	}
+
+	err = yaml.Unmarshal(yamlString, &authConfig)
+	if err != nil {
+		return authConfig, errors.Wrap(err, "failed to unmarshal authentication configuration file")
+	}
+	return authConfig, nil
+}
+
 var healthzOK = []byte("ok\n")
 
 func (e *Exporter) healthz(w http.ResponseWriter, r *http.Request) {

go.mod

@@ -20,4 +20,5 @@ require (
 	golang.org/x/net v0.0.0-20190415214537-1da14a5a36f2 // indirect
 	golang.org/x/sync v0.0.0-20170418210838-de49d9dcd27d
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
+	gopkg.in/yaml.v2 v2.2.7
 )

go.sum

@@ -40,3 +40,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
+gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

test/README.md

@@ -5,3 +5,6 @@ This directory contains simple configurations for testing.
 `nginx -c `pwd`/nginx.conf`
 
 `php-fpm-exporter`
+
+`php-fpm-exporter --auth.config ./php-fpm.example.yml`
+

test/README.ssl

@@ -0,0 +1,25 @@
+#From here: https://www.makethenmakeinstall.com/2014/05/ssl-client-authentication-step-by-step/
+#and here for the crl: https://blog.didierstevens.com/2013/05/08/howto-make-your-own-cert-and-revocation-list-with-openssl/
+
+#generate CA
+openssl req -newkey rsa:4096 -keyform PEM -keyout ca.key -x509 -days 3650 -outform PEM -out ca.cer
+
+#generate CRL
+mkdir demoCA
+touch demoCA/index.txt
+echo 01 > demoCA/crlnumber
+openssl ca -gencrl -keyfile ca.key -cert ca.cer -out ca.crl.pem
+
+#generate server cert
+openssl genrsa -out server.key 4096
+openssl req -new -key server.key -out server.req -sha256
+openssl x509 -req -in server.req -CA ca.cer -CAkey ca.key -set_serial 100 -extensions server -days 1460 -outform PEM -out server.cer -sha256
+rm server.req
+
+#generate client cert
+openssl genrsa -out client.key 4096
+openssl req -new -key client.key -out client.req
+openssl x509 -req -in client.req -CA ca.cer -CAkey ca.key -set_serial 101 -extensions client -days 365 -outform PEM -out client.cer
+openssl pkcs12 -export -inkey client.key -in client.cer -out client.p12
+rm client.req
+

test/ca.cer

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
+MIIFhTCCA22gAwIBAgIUG+HrpsOC/pNAAkoJ9vVbgh6pt38wDQYJKoZIhvcNAQEL
+BQAwUjELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
+GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDELMAkGA1UEAwwCQ0EwHhcNMTkxMjI1
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+vuxJnsBG5GwEOUJsjSKPkShcMgyBSKJisscTKNWkskh75DOXIIXbyLrl9JCi4Hug
+rOOPj7Zx/6nNB5yCfXLayg4kf9G5CvzreUGti4tAUq7BRaoiK9Y36mne2JrRaTxz
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+43mVRxExxK3uapqQbS+irkxbVzPuN1Vn6Q==
+-----END CERTIFICATE-----

test/ca.crl.pem

@@ -0,0 +1,17 @@
+-----BEGIN X509 CRL-----
+MIICqzCBlAIBATANBgkqhkiG9w0BAQsFADBSMQswCQYDVQQGEwJBVTETMBEGA1UE
+CAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQdHkgTHRk
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+KPM/T96sqd/80I6u9uuZ
+-----END X509 CRL-----

test/ca.key

@@ -0,0 +1,54 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----
+MIIJnDBOBgkqhkiG9w0BBQ0wQTApBgkqhkiG9w0BBQwwHAQI2NJkoBPSHNsCAggA
+MAwGCCqGSIb3DQIJBQAwFAYIKoZIhvcNAwcECJB8ZKETti83BIIJSEWVuAdbtE4u
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+NdX7BJ/DF87oeJ5zrOiJDg==
+-----END ENCRYPTED PRIVATE KEY-----

test/client.cer

@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFGjCCAwICAWUwDQYJKoZIhvcNAQELBQAwUjELMAkGA1UEBhMCQVUxEzARBgNV
+BAgMClNvbWUtU3RhdGUxITAfBgNVBAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0
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++dweUTSg4WfaquqhsKc=
+-----END CERTIFICATE-----

test/client.key

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

test/example.htpasswd

@@ -0,0 +1 @@
+user:$apr1$UdluOkCM$AJC2FL37UkLrSZg8DSw0V.