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5. Submission of Contributions. Unless You explicitly state otherwise,
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6. Trademarks. This License does not grant permission to use the trade
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END OF TERMS AND CONDITIONS
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Configurable modular Prometheus exporter for various node metrics.
Copyright 2013-2015 The Prometheus Authors
This product includes software developed at
SoundCloud Ltd. (http://soundcloud.com/).
The following components are included in this product:
wifi
https://github.com/mdlayher/wifi
Copyright 2016-2017 Matt Layher
Licensed under the MIT License
netlink
https://github.com/mdlayher/netlink
Copyright 2016-2017 Matt Layher
Licensed under the MIT License

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# HTTPS Package for Prometheus
The `https` directory contains a Go package and a sample configuration file for
running `node_exporter` with HTTPS instead of HTTP. We currently support TLS 1.3
and TLS 1.2.
To run a server with TLS, use the flag `--web.config`.
e.g. `./node_exporter --web.config="web-config.yml"`
If the config is kept within the https directory.
The config file should be written in YAML format, and is reloaded on each connection to check for new certificates and/or authentication policy.
## Sample Config
```
tls_server_config:
# Certificate and key files for server to use to authenticate to client.
cert_file: <filename>
key_file: <filename>
# Server policy for client authentication. Maps to ClientAuth Policies.
# For more detail on clientAuth options: [ClientAuthType](https://golang.org/pkg/crypto/tls/#ClientAuthType)
[ client_auth_type: <string> | default = "NoClientCert" ]
# CA certificate for client certificate authentication to the server.
[ client_ca_file: <filename> ]
# Minimum TLS version that is acceptable.
[ min_version: <string> | default = "TLS12" ]
# Maximum TLS version that is acceptable.
[ max_version: <string> | default = "TLS13" ]
# List of supported cipher suites for TLS versions up to TLS 1.2. If empty,
# Go default cipher suites are used. Available cipher suites are documented
# in the go documentation:
# https://golang.org/pkg/crypto/tls/#pkg-constants
[ cipher_suites:
[ - <string> ] ]
# prefer_server_cipher_suites controls whether the server selects the
# client's most preferred ciphersuite, or the server's most preferred
# ciphersuite. If true then the server's preference, as expressed in
# the order of elements in cipher_suites, is used.
[ prefer_server_cipher_suites: <bool> | default = true ]
# Elliptic curves that will be used in an ECDHE handshake, in preference
# order. Available curves are documented in the go documentation:
# https://golang.org/pkg/crypto/tls/#CurveID
[ curve_preferences:
[ - <string> ] ]
http_server_config:
# Enable HTTP/2 support. Note that HTTP/2 is only supported with TLS.
# This can not be changed on the fly.
[ http2: <bool> | default = true ]
# List of usernames and hashed passwords that have full access to the web
# server via basic authentication. If empty, no basic authentication is
# required. Passwords are hashed with bcrypt.
basic_auth_users:
[ <username>: <password> ... ]
```
## About bcrypt
There are several tools out there to generate bcrypt passwords, e.g.
[htpasswd](https://httpd.apache.org/docs/2.4/programs/htpasswd.html):
`htpasswd -nBC 10 "" | tr -d ':\n'`
That command will prompt you for a password and output the hashed password,
which will look something like:
`$2y$10$X0h1gDsPszWURQaxFh.zoubFi6DXncSjhoQNJgRrnGs7EsimhC7zG`
The cost (10 in the example) influences the time it takes for computing the
hash. A higher cost will en up slowing down the authentication process.
Depending on the machine, a cost of 10 will take about ~70ms where a cost of
18 can take up to a few seconds. That hash will be computed on every
password-protected request.

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// Copyright 2019 The Prometheus 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 https allows the implementation of TLS.
package https
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"net/http"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/pkg/errors"
config_util "github.com/prometheus/common/config"
"gopkg.in/yaml.v2"
)
var (
errNoTLSConfig = errors.New("TLS config is not present")
)
type Config struct {
TLSConfig TLSStruct `yaml:"tls_server_config"`
HTTPConfig HTTPStruct `yaml:"http_server_config"`
Users map[string]config_util.Secret `yaml:"basic_auth_users"`
}
type TLSStruct struct {
TLSCertPath string `yaml:"cert_file"`
TLSKeyPath string `yaml:"key_file"`
ClientAuth string `yaml:"client_auth_type"`
ClientCAs string `yaml:"client_ca_file"`
CipherSuites []cipher `yaml:"cipher_suites"`
CurvePreferences []curve `yaml:"curve_preferences"`
MinVersion tlsVersion `yaml:"min_version"`
MaxVersion tlsVersion `yaml:"max_version"`
PreferServerCipherSuites bool `yaml:"prefer_server_cipher_suites"`
}
type HTTPStruct struct {
HTTP2 bool `yaml:"http2"`
}
func getConfig(configPath string) (*Config, error) {
content, err := ioutil.ReadFile(configPath)
if err != nil {
return nil, err
}
c := &Config{
TLSConfig: TLSStruct{
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS13,
PreferServerCipherSuites: true,
},
HTTPConfig: HTTPStruct{HTTP2: true},
}
err = yaml.UnmarshalStrict(content, c)
return c, err
}
func getTLSConfig(configPath string) (*tls.Config, error) {
c, err := getConfig(configPath)
if err != nil {
return nil, err
}
return ConfigToTLSConfig(&c.TLSConfig)
}
// ConfigToTLSConfig generates the golang tls.Config from the TLSStruct config.
func ConfigToTLSConfig(c *TLSStruct) (*tls.Config, error) {
if c.TLSCertPath == "" && c.TLSKeyPath == "" && c.ClientAuth == "" && c.ClientCAs == "" {
return nil, errNoTLSConfig
}
if c.TLSCertPath == "" {
return nil, errors.New("missing cert_file")
}
if c.TLSKeyPath == "" {
return nil, errors.New("missing key_file")
}
loadCert := func() (*tls.Certificate, error) {
cert, err := tls.LoadX509KeyPair(c.TLSCertPath, c.TLSKeyPath)
if err != nil {
return nil, errors.Wrap(err, "failed to load X509KeyPair")
}
return &cert, nil
}
// Confirm that certificate and key paths are valid.
if _, err := loadCert(); err != nil {
return nil, err
}
cfg := &tls.Config{
MinVersion: (uint16)(c.MinVersion),
MaxVersion: (uint16)(c.MaxVersion),
PreferServerCipherSuites: c.PreferServerCipherSuites,
}
cfg.GetCertificate = func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
return loadCert()
}
var cf []uint16
for _, c := range c.CipherSuites {
cf = append(cf, (uint16)(c))
}
if len(cf) > 0 {
cfg.CipherSuites = cf
}
var cp []tls.CurveID
for _, c := range c.CurvePreferences {
cp = append(cp, (tls.CurveID)(c))
}
if len(cp) > 0 {
cfg.CurvePreferences = cp
}
if c.ClientCAs != "" {
clientCAPool := x509.NewCertPool()
clientCAFile, err := ioutil.ReadFile(c.ClientCAs)
if err != nil {
return nil, err
}
clientCAPool.AppendCertsFromPEM(clientCAFile)
cfg.ClientCAs = clientCAPool
}
switch c.ClientAuth {
case "RequestClientCert":
cfg.ClientAuth = tls.RequestClientCert
case "RequireClientCert":
cfg.ClientAuth = tls.RequireAnyClientCert
case "VerifyClientCertIfGiven":
cfg.ClientAuth = tls.VerifyClientCertIfGiven
case "RequireAndVerifyClientCert":
cfg.ClientAuth = tls.RequireAndVerifyClientCert
case "", "NoClientCert":
cfg.ClientAuth = tls.NoClientCert
default:
return nil, errors.New("Invalid ClientAuth: " + c.ClientAuth)
}
if c.ClientCAs != "" && cfg.ClientAuth == tls.NoClientCert {
return nil, errors.New("Client CA's have been configured without a Client Auth Policy")
}
return cfg, nil
}
// Listen starts the server on the given address. If tlsConfigPath isn't empty the server connection will be started using TLS.
func Listen(server *http.Server, tlsConfigPath string, logger log.Logger) error {
if tlsConfigPath == "" {
level.Info(logger).Log("msg", "TLS is disabled and it cannot be enabled on the fly.", "http2", false)
return server.ListenAndServe()
}
if err := validateUsers(tlsConfigPath); err != nil {
return err
}
// Setup basic authentication.
var handler http.Handler = http.DefaultServeMux
if server.Handler != nil {
handler = server.Handler
}
server.Handler = &userAuthRoundtrip{
tlsConfigPath: tlsConfigPath,
logger: logger,
handler: handler,
}
c, err := getConfig(tlsConfigPath)
if err != nil {
return err
}
config, err := ConfigToTLSConfig(&c.TLSConfig)
switch err {
case nil:
if !c.HTTPConfig.HTTP2 {
server.TLSNextProto = make(map[string]func(*http.Server, *tls.Conn, http.Handler))
}
// Valid TLS config.
level.Info(logger).Log("msg", "TLS is enabled and it cannot be disabled on the fly.", "http2", c.HTTPConfig.HTTP2)
case errNoTLSConfig:
// No TLS config, back to plain HTTP.
level.Info(logger).Log("msg", "TLS is disabled and it cannot be enabled on the fly.", "http2", false)
return server.ListenAndServe()
default:
// Invalid TLS config.
return err
}
server.TLSConfig = config
// Set the GetConfigForClient method of the HTTPS server so that the config
// and certs are reloaded on new connections.
server.TLSConfig.GetConfigForClient = func(*tls.ClientHelloInfo) (*tls.Config, error) {
return getTLSConfig(tlsConfigPath)
}
return server.ListenAndServeTLS("", "")
}
type cipher uint16
func (c *cipher) UnmarshalYAML(unmarshal func(interface{}) error) error {
var s string
err := unmarshal((*string)(&s))
if err != nil {
return err
}
for _, cs := range tls.CipherSuites() {
if cs.Name == s {
*c = (cipher)(cs.ID)
return nil
}
}
return errors.New("unknown cipher: " + s)
}
func (c cipher) MarshalYAML() (interface{}, error) {
return tls.CipherSuiteName((uint16)(c)), nil
}
type curve tls.CurveID
var curves = map[string]curve{
"CurveP256": (curve)(tls.CurveP256),
"CurveP384": (curve)(tls.CurveP384),
"CurveP521": (curve)(tls.CurveP521),
"X25519": (curve)(tls.X25519),
}
func (c *curve) UnmarshalYAML(unmarshal func(interface{}) error) error {
var s string
err := unmarshal((*string)(&s))
if err != nil {
return err
}
if curveid, ok := curves[s]; ok {
*c = curveid
return nil
}
return errors.New("unknown curve: " + s)
}
func (c *curve) MarshalYAML() (interface{}, error) {
for s, curveid := range curves {
if *c == curveid {
return s, nil
}
}
return fmt.Sprintf("%v", c), nil
}
type tlsVersion uint16
var tlsVersions = map[string]tlsVersion{
"TLS13": (tlsVersion)(tls.VersionTLS13),
"TLS12": (tlsVersion)(tls.VersionTLS12),
"TLS11": (tlsVersion)(tls.VersionTLS11),
"TLS10": (tlsVersion)(tls.VersionTLS10),
}
func (tv *tlsVersion) UnmarshalYAML(unmarshal func(interface{}) error) error {
var s string
err := unmarshal((*string)(&s))
if err != nil {
return err
}
if v, ok := tlsVersions[s]; ok {
*tv = v
return nil
}
return errors.New("unknown TLS version: " + s)
}
func (tv *tlsVersion) MarshalYAML() (interface{}, error) {
for s, v := range tlsVersions {
if *tv == v {
return s, nil
}
}
return fmt.Sprintf("%v", tv), nil
}

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// Copyright 2020 The Prometheus 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 https
import (
"net/http"
"github.com/go-kit/kit/log"
"golang.org/x/crypto/bcrypt"
)
func validateUsers(configPath string) error {
c, err := getConfig(configPath)
if err != nil {
return err
}
for _, p := range c.Users {
_, err = bcrypt.Cost([]byte(p))
if err != nil {
return err
}
}
return nil
}
type userAuthRoundtrip struct {
tlsConfigPath string
handler http.Handler
logger log.Logger
}
func (u *userAuthRoundtrip) ServeHTTP(w http.ResponseWriter, r *http.Request) {
c, err := getConfig(u.tlsConfigPath)
if err != nil {
u.logger.Log("msg", "Unable to parse configuration", "err", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
if len(c.Users) == 0 {
u.handler.ServeHTTP(w, r)
return
}
user, pass, ok := r.BasicAuth()
if !ok {
w.Header().Set("WWW-Authenticate", "Basic")
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
if hashedPassword, ok := c.Users[user]; ok {
if err := bcrypt.CompareHashAndPassword([]byte(hashedPassword), []byte(pass)); err == nil {
u.handler.ServeHTTP(w, r)
return
}
}
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
}

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tls_config:
# Certificate and key files for server to use to authenticate to client
cert_file: <filename>
key_file: <filename>
# Server policy for client authentication. Maps to ClientAuth Policies
# For more detail on clientAuth options: [ClientAuthType](https://golang.org/pkg/crypto/tls/#ClientAuthType)
[ client_auth_type: <string> | default = "NoClientCert" ]
# CA certificate for client certificate authentication to the server
[ client_ca_file: <filename> ]