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// Copyright 2017 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package db
import (
"encoding/base64"
"fmt"
"time"
"github.com/pquerna/otp/totp"
"github.com/unknwon/com"
"gogs.io/gogs/internal/conf"
"gogs.io/gogs/internal/cryptoutil"
)
// TwoFactor is a 2FA token of a user.
type TwoFactor struct {
ID int64 `gorm:"primaryKey"`
UserID int64 `xorm:"UNIQUE" gorm:"unique"`
Secret string
Created time.Time `xorm:"-" gorm:"-" json:"-"`
CreatedUnix int64
}
// ValidateTOTP returns true if given passcode is valid for two-factor authentication token.
// It also returns possible validation error.
func (t *TwoFactor) ValidateTOTP(passcode string) (bool, error) {
secret, err := base64.StdEncoding.DecodeString(t.Secret)
if err != nil {
return false, fmt.Errorf("DecodeString: %v", err)
}
decryptSecret, err := com.AESGCMDecrypt(cryptoutil.MD5Bytes(conf.Security.SecretKey), secret)
if err != nil {
return false, fmt.Errorf("AESGCMDecrypt: %v", err)
}
return totp.Validate(passcode, string(decryptSecret)), nil
}
// DeleteTwoFactor removes two-factor authentication token and recovery codes of given user.
func DeleteTwoFactor(userID int64) (err error) {
sess := x.NewSession()
defer sess.Close()
if err = sess.Begin(); err != nil {
return err
}
if _, err = sess.Where("user_id = ?", userID).Delete(new(TwoFactor)); err != nil {
return fmt.Errorf("delete two-factor: %v", err)
} else if err = deleteRecoveryCodesByUserID(sess, userID); err != nil {
return fmt.Errorf("deleteRecoveryCodesByUserID: %v", err)
}
return sess.Commit()
}
// TwoFactorRecoveryCode represents a two-factor authentication recovery code.
type TwoFactorRecoveryCode struct {
ID int64
UserID int64
Code string `xorm:"VARCHAR(11)"`
IsUsed bool
}
// GetRecoveryCodesByUserID returns all recovery codes of given user.
func GetRecoveryCodesByUserID(userID int64) ([]*TwoFactorRecoveryCode, error) {
recoveryCodes := make([]*TwoFactorRecoveryCode, 0, 10)
return recoveryCodes, x.Where("user_id = ?", userID).Find(&recoveryCodes)
}
func deleteRecoveryCodesByUserID(e Engine, userID int64) error {
_, err := e.Where("user_id = ?", userID).Delete(new(TwoFactorRecoveryCode))
return err
}
// RegenerateRecoveryCodes regenerates new set of recovery codes for given user.
func RegenerateRecoveryCodes(userID int64) error {
recoveryCodes, err := generateRecoveryCodes(userID, 10)
if err != nil {
return fmt.Errorf("generateRecoveryCodes: %v", err)
}
sess := x.NewSession()
defer sess.Close()
if err = sess.Begin(); err != nil {
return err
}
if err = deleteRecoveryCodesByUserID(sess, userID); err != nil {
return fmt.Errorf("deleteRecoveryCodesByUserID: %v", err)
} else if _, err = sess.Insert(recoveryCodes); err != nil {
return fmt.Errorf("insert new recovery codes: %v", err)
}
return sess.Commit()
}
type ErrTwoFactorRecoveryCodeNotFound struct {
Code string
}
func IsTwoFactorRecoveryCodeNotFound(err error) bool {
_, ok := err.(ErrTwoFactorRecoveryCodeNotFound)
return ok
}
func (err ErrTwoFactorRecoveryCodeNotFound) Error() string {
return fmt.Sprintf("two-factor recovery code does not found [code: %s]", err.Code)
}
// UseRecoveryCode validates recovery code of given user and marks it is used if valid.
func UseRecoveryCode(_ int64, code string) error {
recoveryCode := new(TwoFactorRecoveryCode)
has, err := x.Where("code = ?", code).And("is_used = ?", false).Get(recoveryCode)
if err != nil {
return fmt.Errorf("get unused code: %v", err)
} else if !has {
return ErrTwoFactorRecoveryCodeNotFound{Code: code}
}
recoveryCode.IsUsed = true
if _, err = x.Id(recoveryCode.ID).Cols("is_used").Update(recoveryCode); err != nil {
return fmt.Errorf("mark code as used: %v", err)
}
return nil
}
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