141 lines
4.1 KiB
Go
141 lines
4.1 KiB
Go
/*
|
|
Copyright 2015 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 transport
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"net/http"
|
|
)
|
|
|
|
// New returns an http.RoundTripper that will provide the authentication
|
|
// or transport level security defined by the provided Config.
|
|
func New(config *Config) (http.RoundTripper, error) {
|
|
// Set transport level security
|
|
if config.Transport != nil && (config.HasCA() || config.HasCertAuth() || config.TLS.Insecure) {
|
|
return nil, fmt.Errorf("using a custom transport with TLS certificate options or the insecure flag is not allowed")
|
|
}
|
|
|
|
var (
|
|
rt http.RoundTripper
|
|
err error
|
|
)
|
|
|
|
if config.Transport != nil {
|
|
rt = config.Transport
|
|
} else {
|
|
rt, err = tlsCache.get(config)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return HTTPWrappersForConfig(config, rt)
|
|
}
|
|
|
|
// TLSConfigFor returns a tls.Config that will provide the transport level security defined
|
|
// by the provided Config. Will return nil if no transport level security is requested.
|
|
func TLSConfigFor(c *Config) (*tls.Config, error) {
|
|
if !(c.HasCA() || c.HasCertAuth() || c.TLS.Insecure) {
|
|
return nil, nil
|
|
}
|
|
if c.HasCA() && c.TLS.Insecure {
|
|
return nil, fmt.Errorf("specifying a root certificates file with the insecure flag is not allowed")
|
|
}
|
|
if err := loadTLSFiles(c); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
tlsConfig := &tls.Config{
|
|
// Can't use SSLv3 because of POODLE and BEAST
|
|
// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
|
|
// Can't use TLSv1.1 because of RC4 cipher usage
|
|
MinVersion: tls.VersionTLS12,
|
|
InsecureSkipVerify: c.TLS.Insecure,
|
|
ServerName: c.TLS.ServerName,
|
|
}
|
|
|
|
if c.HasCA() {
|
|
tlsConfig.RootCAs = rootCertPool(c.TLS.CAData)
|
|
}
|
|
|
|
if c.HasCertAuth() {
|
|
cert, err := tls.X509KeyPair(c.TLS.CertData, c.TLS.KeyData)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tlsConfig.Certificates = []tls.Certificate{cert}
|
|
}
|
|
|
|
return tlsConfig, nil
|
|
}
|
|
|
|
// loadTLSFiles copies the data from the CertFile, KeyFile, and CAFile fields into the CertData,
|
|
// KeyData, and CAFile fields, or returns an error. If no error is returned, all three fields are
|
|
// either populated or were empty to start.
|
|
func loadTLSFiles(c *Config) error {
|
|
var err error
|
|
c.TLS.CAData, err = dataFromSliceOrFile(c.TLS.CAData, c.TLS.CAFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.TLS.CertData, err = dataFromSliceOrFile(c.TLS.CertData, c.TLS.CertFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.TLS.KeyData, err = dataFromSliceOrFile(c.TLS.KeyData, c.TLS.KeyFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// dataFromSliceOrFile returns data from the slice (if non-empty), or from the file,
|
|
// or an error if an error occurred reading the file
|
|
func dataFromSliceOrFile(data []byte, file string) ([]byte, error) {
|
|
if len(data) > 0 {
|
|
return data, nil
|
|
}
|
|
if len(file) > 0 {
|
|
fileData, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return []byte{}, err
|
|
}
|
|
return fileData, nil
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// rootCertPool returns nil if caData is empty. When passed along, this will mean "use system CAs".
|
|
// When caData is not empty, it will be the ONLY information used in the CertPool.
|
|
func rootCertPool(caData []byte) *x509.CertPool {
|
|
// What we really want is a copy of x509.systemRootsPool, but that isn't exposed. It's difficult to build (see the go
|
|
// code for a look at the platform specific insanity), so we'll use the fact that RootCAs == nil gives us the system values
|
|
// It doesn't allow trusting either/or, but hopefully that won't be an issue
|
|
if len(caData) == 0 {
|
|
return nil
|
|
}
|
|
|
|
// if we have caData, use it
|
|
certPool := x509.NewCertPool()
|
|
certPool.AppendCertsFromPEM(caData)
|
|
return certPool
|
|
}
|