github.com/zoumo/helm@v2.5.0+incompatible/pkg/tlsutil/tls.go (about) 1 /* 2 Copyright 2016 The Kubernetes Authors All rights reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package tlsutil 18 19 import ( 20 "crypto/tls" 21 "crypto/x509" 22 "fmt" 23 "io/ioutil" 24 ) 25 26 // NewClientTLS returns tls.Config appropriate for client auth. 27 func NewClientTLS(certFile, keyFile, caFile string) (*tls.Config, error) { 28 cert, err := CertFromFilePair(certFile, keyFile) 29 if err != nil { 30 return nil, err 31 } 32 cp, err := CertPoolFromFile(caFile) 33 if err != nil { 34 return nil, err 35 } 36 return &tls.Config{ 37 Certificates: []tls.Certificate{*cert}, 38 RootCAs: cp, 39 }, nil 40 } 41 42 // CertPoolFromFile returns an x509.CertPool containing the certificates 43 // in the given PEM-encoded file. 44 // Returns an error if the file could not be read, a certificate could not 45 // be parsed, or if the file does not contain any certificates 46 func CertPoolFromFile(filename string) (*x509.CertPool, error) { 47 b, err := ioutil.ReadFile(filename) 48 if err != nil { 49 return nil, fmt.Errorf("can't read CA file: %v", filename) 50 } 51 cp := x509.NewCertPool() 52 if !cp.AppendCertsFromPEM(b) { 53 return nil, fmt.Errorf("failed to append certificates from file: %s", filename) 54 } 55 return cp, nil 56 } 57 58 // CertFromFilePair returns an tls.Certificate containing the 59 // certificates public/private key pair from a pair of given PEM-encoded files. 60 // Returns an error if the file could not be read, a certificate could not 61 // be parsed, or if the file does not contain any certificates 62 func CertFromFilePair(certFile, keyFile string) (*tls.Certificate, error) { 63 cert, err := tls.LoadX509KeyPair(certFile, keyFile) 64 if err != nil { 65 return nil, fmt.Errorf("can't load key pair from cert %s and key %s", certFile, keyFile) 66 } 67 return &cert, err 68 }