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98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
/*
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Copyright The Helm 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 tlsutil
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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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"k8s.io/helm/pkg/urlutil"
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)
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func newTLSConfigCommon(certFile, keyFile, caFile string) (*tls.Config, error) {
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config := tls.Config{}
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if certFile != "" && keyFile != "" {
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cert, err := CertFromFilePair(certFile, keyFile)
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if err != nil {
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return nil, err
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}
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config.Certificates = []tls.Certificate{*cert}
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}
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if caFile != "" {
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cp, err := CertPoolFromFile(caFile)
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if err != nil {
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return nil, err
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}
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config.RootCAs = cp
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}
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return &config, nil
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}
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// NewClientTLS returns tls.Config appropriate for client auth.
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func NewClientTLS(certFile, keyFile, caFile string) (*tls.Config, error) {
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return newTLSConfigCommon(certFile, keyFile, caFile)
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}
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// NewTLSConfig returns tls.Config appropriate for client and/or server auth.
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func NewTLSConfig(url, certFile, keyFile, caFile string) (*tls.Config, error) {
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config, err := newTLSConfigCommon(certFile, keyFile, caFile)
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if err != nil {
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return nil, err
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}
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config.BuildNameToCertificate()
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serverName, err := urlutil.ExtractHostname(url)
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if err != nil {
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return nil, err
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}
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config.ServerName = serverName
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return config, nil
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}
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// CertPoolFromFile returns an x509.CertPool containing the certificates
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// in the given PEM-encoded file.
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// Returns an error if the file could not be read, a certificate could not
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// be parsed, or if the file does not contain any certificates
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func CertPoolFromFile(filename string) (*x509.CertPool, error) {
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b, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, fmt.Errorf("can't read CA file: %v", filename)
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}
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cp := x509.NewCertPool()
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if !cp.AppendCertsFromPEM(b) {
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return nil, fmt.Errorf("failed to append certificates from file: %s", filename)
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}
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return cp, nil
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}
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// CertFromFilePair returns an tls.Certificate containing the
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// certificates public/private key pair from a pair of given PEM-encoded files.
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// Returns an error if the file could not be read, a certificate could not
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// be parsed, or if the file does not contain any certificates
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func CertFromFilePair(certFile, keyFile string) (*tls.Certificate, error) {
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cert, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, fmt.Errorf("can't load key pair from cert %s and key %s: %s", certFile, keyFile, err)
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}
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return &cert, err
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}
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