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package adal
// Copyright 2017 Microsoft Corporation
//
// 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.
import (
"crypto/rsa"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"golang.org/x/crypto/pkcs12"
)
var (
// ErrMissingCertificate is returned when no local certificate is found in the provided PFX data.
ErrMissingCertificate = errors.New("adal: certificate missing")
// ErrMissingPrivateKey is returned when no private key is found in the provided PFX data.
ErrMissingPrivateKey = errors.New("adal: private key missing")
)
// LoadToken restores a Token object from a file located at 'path'.
func LoadToken(path string) (*Token, error) {
file, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("failed to open file (%s) while loading token: %v", path, err)
}
defer file.Close()
var token Token
dec := json.NewDecoder(file)
if err = dec.Decode(&token); err != nil {
return nil, fmt.Errorf("failed to decode contents of file (%s) into Token representation: %v", path, err)
}
return &token, nil
}
// SaveToken persists an oauth token at the given location on disk.
// It moves the new file into place so it can safely be used to replace an existing file
// that maybe accessed by multiple processes.
func SaveToken(path string, mode os.FileMode, token Token) error {
dir := filepath.Dir(path)
err := os.MkdirAll(dir, os.ModePerm)
if err != nil {
return fmt.Errorf("failed to create directory (%s) to store token in: %v", dir, err)
}
newFile, err := ioutil.TempFile(dir, "token")
if err != nil {
return fmt.Errorf("failed to create the temp file to write the token: %v", err)
}
tempPath := newFile.Name()
if err := json.NewEncoder(newFile).Encode(token); err != nil {
return fmt.Errorf("failed to encode token to file (%s) while saving token: %v", tempPath, err)
}
if err := newFile.Close(); err != nil {
return fmt.Errorf("failed to close temp file %s: %v", tempPath, err)
}
// Atomic replace to avoid multi-writer file corruptions
if err := os.Rename(tempPath, path); err != nil {
return fmt.Errorf("failed to move temporary token to desired output location. src=%s dst=%s: %v", tempPath, path, err)
}
if err := os.Chmod(path, mode); err != nil {
return fmt.Errorf("failed to chmod the token file %s: %v", path, err)
}
return nil
}
// DecodePfxCertificateData extracts the x509 certificate and RSA private key from the provided PFX data.
// The PFX data must contain a private key along with a certificate whose public key matches that of the
// private key or an error is returned.
// If the private key is not password protected pass the empty string for password.
func DecodePfxCertificateData(pfxData []byte, password string) (*x509.Certificate, *rsa.PrivateKey, error) {
blocks, err := pkcs12.ToPEM(pfxData, password)
if err != nil {
return nil, nil, err
}
// first extract the private key
var priv *rsa.PrivateKey
for _, block := range blocks {
if block.Type == "PRIVATE KEY" {
priv, err = x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, nil, err
}
break
}
}
if priv == nil {
return nil, nil, ErrMissingPrivateKey
}
// now find the certificate with the matching public key of our private key
var cert *x509.Certificate
for _, block := range blocks {
if block.Type == "CERTIFICATE" {
pcert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, nil, err
}
certKey, ok := pcert.PublicKey.(*rsa.PublicKey)
if !ok {
// keep looking
continue
}
if priv.E == certKey.E && priv.N.Cmp(certKey.N) == 0 {
// found a match
cert = pcert
break
}
}
}
if cert == nil {
return nil, nil, ErrMissingCertificate
}
return cert, priv, nil
}
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