mirror of https://github.com/mitchell/selfpass.git
159 lines
3.2 KiB
Go
159 lines
3.2 KiB
Go
package repositories
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import (
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"bytes"
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"crypto/rand"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"github.com/mitchellh/go-homedir"
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"github.com/spf13/viper"
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"gopkg.in/AlecAivazis/survey.v1"
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"github.com/mitchell/selfpass/sp/crypto"
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"github.com/mitchell/selfpass/sp/types"
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)
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func NewConfigManager(cfgFile *string) *ConfigManager {
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return &ConfigManager{
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cfgFile: cfgFile,
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}
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}
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type ConfigManager struct {
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masterpass string
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cfgFile *string
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v *viper.Viper
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}
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func (mgr *ConfigManager) SetMasterpass(masterpass string) {
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mgr.masterpass = masterpass
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}
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func (mgr *ConfigManager) OpenConfig() (output string, v *viper.Viper, err error) {
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if mgr.masterpass != "" {
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return mgr.masterpass, mgr.v, nil
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}
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cfg := *mgr.cfgFile
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mgr.v = viper.New()
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mgr.v.SetConfigType("toml")
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if cfg == "" {
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home, err := homedir.Dir()
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if err != nil {
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return output, nil, err
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}
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cfg = home + "/.sp.toml"
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}
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mgr.v.SetConfigFile(cfg)
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mgr.cfgFile = &cfg
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var contents []byte
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var configDecrypted bool
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if _, err := os.Open(cfg); os.IsNotExist(err) {
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return output, mgr.v, fmt.Errorf("no config found, run 'init' command")
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}
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prompt := &survey.Password{Message: "Master password:"}
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if err = survey.AskOne(prompt, &mgr.masterpass, nil); err != nil {
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return output, nil, err
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}
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contents, err = decryptConfig(mgr.masterpass, cfg)
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if err == errConfigDecrypted {
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configDecrypted = true
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} else if err != nil && err.Error() == crypto.ErrAuthenticationFailed.Error() {
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return output, nil, errors.New("incorrect masterpass")
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} else if err != nil {
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return output, nil, err
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}
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if err = mgr.v.ReadConfig(bytes.NewBuffer(contents)); err != nil {
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return output, nil, err
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}
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if configDecrypted {
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fmt.Println("Config wasn't encrypted, or has been compromised.")
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if err = mgr.WriteConfig(); err != nil {
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return output, nil, err
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}
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}
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return mgr.masterpass, mgr.v, nil
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}
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var errConfigDecrypted = errors.New("config is decrypted")
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func decryptConfig(masterpass string, cfgFile string) (contents []byte, err error) {
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contents, err = ioutil.ReadFile(cfgFile)
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if err != nil {
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return contents, err
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}
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if string(contents[:len(types.KeyPrivateKey)]) == types.KeyPrivateKey {
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return contents, errConfigDecrypted
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}
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salt := contents[:saltSize]
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contents = contents[saltSize:]
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passkey := crypto.GeneratePBKDF2Key([]byte(masterpass), salt)
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plaintext, err := crypto.GCMDecrypt(passkey, contents)
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if err != nil {
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return contents, err
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}
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return plaintext, nil
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}
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func (mgr ConfigManager) DecryptConfig() error {
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if err := mgr.v.WriteConfig(); 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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func (mgr ConfigManager) WriteConfig() (err error) {
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if err := mgr.v.WriteConfigAs(*mgr.cfgFile); err != nil {
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return err
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}
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contents, err := ioutil.ReadFile(mgr.v.ConfigFileUsed())
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if err != nil {
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return err
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}
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salt := make([]byte, saltSize)
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_, err = rand.Read(salt)
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if err != nil {
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return err
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}
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keypass := crypto.GeneratePBKDF2Key([]byte(mgr.masterpass), salt)
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contents, err = crypto.GCMEncrypt(keypass, contents)
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if err != nil {
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return err
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}
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contents = append(salt, contents...)
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err = ioutil.WriteFile(mgr.v.ConfigFileUsed(), contents, 0600)
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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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const saltSize = 16
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