142 lines
4.1 KiB
Go
142 lines
4.1 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transport
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"io/ioutil"
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"net/http"
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)
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// New returns an http.RoundTripper that will provide the authentication
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// or transport level security defined by the provided Config.
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func New(config *Config) (http.RoundTripper, error) {
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// Set transport level security
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if config.Transport != nil && (config.HasCA() || config.HasCertAuth() || config.TLS.Insecure) {
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return nil, fmt.Errorf("using a custom transport with TLS certificate options or the insecure flag is not allowed")
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}
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var (
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rt http.RoundTripper
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err error
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)
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if config.Transport != nil {
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rt = config.Transport
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} else {
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rt, err = tlsCache.get(config)
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if err != nil {
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return nil, err
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}
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}
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return HTTPWrappersForConfig(config, rt)
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}
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// TLSConfigFor returns a tls.Config that will provide the transport level security defined
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// by the provided Config. Will return nil if no transport level security is requested.
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func TLSConfigFor(c *Config) (*tls.Config, error) {
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if !(c.HasCA() || c.HasCertAuth() || c.TLS.Insecure) {
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return nil, nil
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}
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if c.HasCA() && c.TLS.Insecure {
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return nil, fmt.Errorf("specifying a root certificates file with the insecure flag is not allowed")
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}
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if err := loadTLSFiles(c); err != nil {
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return nil, err
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}
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tlsConfig := &tls.Config{
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// Can't use SSLv3 because of POODLE and BEAST
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// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
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// Can't use TLSv1.1 because of RC4 cipher usage
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MinVersion: tls.VersionTLS12,
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InsecureSkipVerify: c.TLS.Insecure,
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ServerName: c.TLS.ServerName,
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}
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if c.HasCA() {
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tlsConfig.RootCAs = rootCertPool(c.TLS.CAData)
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}
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if c.HasCertAuth() {
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cert, err := tls.X509KeyPair(c.TLS.CertData, c.TLS.KeyData)
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if err != nil {
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return nil, err
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}
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tlsConfig.Certificates = []tls.Certificate{cert}
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}
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return tlsConfig, nil
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}
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// loadTLSFiles copies the data from the CertFile, KeyFile, and CAFile fields into the CertData,
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// KeyData, and CAFile fields, or returns an error. If no error is returned, all three fields are
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// either populated or were empty to start.
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func loadTLSFiles(c *Config) error {
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var err error
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c.TLS.CAData, err = dataFromSliceOrFile(c.TLS.CAData, c.TLS.CAFile)
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if err != nil {
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return err
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}
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c.TLS.CertData, err = dataFromSliceOrFile(c.TLS.CertData, c.TLS.CertFile)
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if err != nil {
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return err
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}
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c.TLS.KeyData, err = dataFromSliceOrFile(c.TLS.KeyData, c.TLS.KeyFile)
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if err != nil {
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return err
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}
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return nil
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}
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// dataFromSliceOrFile returns data from the slice (if non-empty), or from the file,
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// or an error if an error occurred reading the file
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func dataFromSliceOrFile(data []byte, file string) ([]byte, error) {
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if len(data) > 0 {
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return data, nil
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}
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if len(file) > 0 {
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fileData, err := ioutil.ReadFile(file)
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if err != nil {
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return []byte{}, err
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}
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return fileData, nil
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}
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return nil, nil
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}
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// rootCertPool returns nil if caData is empty. When passed along, this will mean "use system CAs".
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// When caData is not empty, it will be the ONLY information used in the CertPool.
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func rootCertPool(caData []byte) *x509.CertPool {
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// What we really want is a copy of x509.systemRootsPool, but that isn't exposed. It's difficult to build (see the go
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// code for a look at the platform specific insanity), so we'll use the fact that RootCAs == nil gives us the system values
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// It doesn't allow trusting either/or, but hopefully that won't be an issue
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if len(caData) == 0 {
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return nil
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}
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// if we have caData, use it
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certPool := x509.NewCertPool()
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certPool.AppendCertsFromPEM(caData)
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return certPool
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}
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