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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"
"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_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"`
}
func getConfig(configPath string) (*Config, error) {
content, err := ioutil.ReadFile(configPath)
if err != nil {
return nil, err
}
c := &Config{}
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")
}
cfg := &tls.Config{
MinVersion: tls.VersionTLS12,
}
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.GetCertificate = func(*tls.ClientHelloInfo) (*tls.Certificate, error) {
return loadCert()
}
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.")
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,
}
config, err := getTLSConfig(tlsConfigPath)
switch err {
case nil:
// Valid TLS config.
level.Info(logger).Log("msg", "TLS is enabled and it cannot be disabled on the fly.")
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.")
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("", "")
}
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