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config.go
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config.go
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package cred
import (
"bytes"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"github.com/viant/toolbox"
"golang.org/x/crypto/ssh"
"golang.org/x/oauth2/google"
"golang.org/x/oauth2/jwt"
"gopkg.in/yaml.v2"
"io"
"io/ioutil"
"os"
"path"
"strings"
)
var sshKeyFileCandidates = []string{"/.ssh/id_rsa", "/.ssh/id_dsa"}
var DefaultKey = []byte{0x24, 0x66, 0xDD, 0x87, 0x8B, 0x96, 0x3C, 0x9D}
var PasswordCipher = GetDefaultPasswordCipher()
type Config struct {
Username string `json:",omitempty"`
Password string `json:",omitempty"`
EncryptedPassword string `json:",omitempty"`
PrivateKeyPath string `json:",omitempty"`
//amazon cloud credential
Key string `json:",omitempty"`
Secret string `json:",omitempty"`
Region string `json:",omitempty"`
AccountID string `json:"-"`
Token string `json:"-"`
//google cloud credential
ClientEmail string `json:"client_email,omitempty"`
TokenURL string `json:"token_uri,omitempty"`
PrivateKey string `json:"private_key,omitempty"`
PrivateKeyID string `json:"private_key_id,omitempty"`
ProjectID string `json:"project_id,omitempty"`
//JSON string for this secret
Data string `json:",omitempty"`
sshClientConfig *ssh.ClientConfig
jwtClientConfig *jwt.Config
}
func (c *Config) Load(filename string) error {
reader, err := toolbox.OpenFile(filename)
if err != nil {
return err
}
defer reader.Close()
ext := path.Ext(filename)
return c.LoadFromReader(reader, ext)
}
func (c *Config) LoadFromReader(reader io.Reader, ext string) error {
if strings.Contains(ext, "yaml") || strings.Contains(ext, "yml") {
var data, err = ioutil.ReadAll(reader)
if err != nil {
return err
}
err = yaml.Unmarshal(data, c)
if err != nil {
return err
}
} else {
err := json.NewDecoder(reader).Decode(c)
if err != nil {
return nil
}
}
if c.EncryptedPassword != "" {
decoder := base64.NewDecoder(base64.StdEncoding, strings.NewReader(c.EncryptedPassword))
data, err := ioutil.ReadAll(decoder)
if err != nil {
return err
}
c.Password = string(PasswordCipher.Decrypt(data))
} else if c.Password != "" {
c.encryptPassword(c.Password)
}
return nil
}
func (c *Config) Save(filename string) error {
_ = os.Remove(filename)
file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
return c.Write(file)
}
func (c *Config) Write(writer io.Writer) error {
var password = c.Password
defer func() { c.Password = password }()
if password != "" {
c.encryptPassword(password)
c.Password = ""
}
return json.NewEncoder(writer).Encode(c)
}
func (c *Config) encryptPassword(password string) {
encrypted := PasswordCipher.Encrypt([]byte(password))
buf := new(bytes.Buffer)
encoder := base64.NewEncoder(base64.StdEncoding, buf)
defer encoder.Close()
encoder.Write(encrypted)
encoder.Close()
c.EncryptedPassword = string(buf.Bytes())
}
func (c *Config) applyDefaultIfNeeded() {
if c.Username == "" {
c.Username = os.Getenv("USER")
}
if c.PrivateKeyPath == "" && c.Password == "" {
homeDirectory := os.Getenv("HOME")
if homeDirectory != "" {
for _, candidate := range sshKeyFileCandidates {
filename := path.Join(homeDirectory, candidate)
file, err := os.Open(filename)
if err == nil {
file.Close()
c.PrivateKeyPath = filename
break
}
}
}
}
}
//IsKeyEncrypted checks if supplied key content is encrypyed by password
func IsKeyEncrypted(keyPath string) bool {
privateKeyBytes, err := ioutil.ReadFile(keyPath)
if err != nil {
return false
}
block, _ := pem.Decode(privateKeyBytes)
if block == nil {
return false
}
return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED")
}
//SSHClientConfig returns a new instance of sshClientConfig
func (c *Config) SSHClientConfig() (*ssh.ClientConfig, error) {
return c.ClientConfig()
}
//NewJWTConfig returns new JWT config for supplied scopes
func (c *Config) NewJWTConfig(scopes ...string) (*jwt.Config, error) {
var result = &jwt.Config{
Email: c.ClientEmail,
Subject: c.ClientEmail,
PrivateKey: []byte(c.PrivateKey),
PrivateKeyID: c.PrivateKeyID,
Scopes: scopes,
TokenURL: c.TokenURL,
}
if c.PrivateKeyPath != "" && c.PrivateKey == "" {
privateKey, err := ioutil.ReadFile(c.PrivateKeyPath)
if err != nil {
return nil, fmt.Errorf("failed to open provide key: %v, %v", c.PrivateKeyPath, err)
}
result.PrivateKey = privateKey
}
if result.TokenURL == "" {
result.TokenURL = google.JWTTokenURL
}
return result, nil
}
//ClientConfig returns a new instance of sshClientConfig
func (c *Config) ClientConfig() (*ssh.ClientConfig, error) {
if c.sshClientConfig != nil {
return c.sshClientConfig, nil
}
c.applyDefaultIfNeeded()
result := &ssh.ClientConfig{
User: c.Username,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Auth: make([]ssh.AuthMethod, 0),
}
if c.Password != "" {
result.Auth = append(result.Auth, ssh.Password(c.Password))
}
if c.PrivateKeyPath != "" {
if IsKeyEncrypted(c.PrivateKeyPath) {
return nil, fmt.Errorf("key: %v, has been encrypeed with password", c.PrivateKeyPath)
}
privateKeyBytes, err := ioutil.ReadFile(c.PrivateKeyPath)
if err != nil {
return nil, err
}
key, err := ssh.ParsePrivateKey(privateKeyBytes)
if err != nil {
return nil, err
}
result.Auth = append(result.Auth, ssh.PublicKeys(key))
}
c.sshClientConfig = result
return result, nil
}
//NewConfig create a new config for supplied file name
func NewConfig(filename string) (*Config, error) {
var config = &Config{}
err := config.Load(filename)
if err != nil {
return nil, err
}
config.applyDefaultIfNeeded()
return config, nil
}
//GetDefaultPasswordCipher return a default password cipher
func GetDefaultPasswordCipher() Cipher {
var result, err = NewBlowfishCipher(DefaultKey)
if err != nil {
return nil
}
return result
}