mirror of
https://github.com/go-gitea/gitea.git
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171 lines
4.4 KiB
Go
171 lines
4.4 KiB
Go
// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"crypto/rand"
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"crypto/sha256"
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"crypto/subtle"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"github.com/pquerna/otp/totp"
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"golang.org/x/crypto/pbkdf2"
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"code.gitea.io/gitea/modules/generate"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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)
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// TwoFactor represents a two-factor authentication token.
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type TwoFactor struct {
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ID int64 `xorm:"pk autoincr"`
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UID int64 `xorm:"UNIQUE"`
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Secret string
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ScratchSalt string
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ScratchHash string
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LastUsedPasscode string `xorm:"VARCHAR(10)"`
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CreatedUnix util.TimeStamp `xorm:"INDEX created"`
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UpdatedUnix util.TimeStamp `xorm:"INDEX updated"`
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}
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// GenerateScratchToken recreates the scratch token the user is using.
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func (t *TwoFactor) GenerateScratchToken() (string, error) {
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token, err := generate.GetRandomString(8)
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if err != nil {
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return "", err
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}
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t.ScratchSalt, _ = generate.GetRandomString(10)
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t.ScratchHash = hashToken(token, t.ScratchSalt)
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return token, nil
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}
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func hashToken(token, salt string) string {
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tempHash := pbkdf2.Key([]byte(token), []byte(salt), 10000, 50, sha256.New)
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return fmt.Sprintf("%x", tempHash)
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}
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// VerifyScratchToken verifies if the specified scratch token is valid.
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func (t *TwoFactor) VerifyScratchToken(token string) bool {
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if len(token) == 0 {
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return false
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}
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tempHash := hashToken(token, t.ScratchSalt)
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return subtle.ConstantTimeCompare([]byte(t.ScratchHash), []byte(tempHash)) == 1
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}
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func (t *TwoFactor) getEncryptionKey() []byte {
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k := md5.Sum([]byte(setting.SecretKey))
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return k[:]
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}
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// SetSecret sets the 2FA secret.
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func (t *TwoFactor) SetSecret(secret string) error {
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secretBytes, err := aesEncrypt(t.getEncryptionKey(), []byte(secret))
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if err != nil {
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return err
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}
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t.Secret = base64.StdEncoding.EncodeToString(secretBytes)
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return nil
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}
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// ValidateTOTP validates the provided passcode.
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func (t *TwoFactor) ValidateTOTP(passcode string) (bool, error) {
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decodedStoredSecret, err := base64.StdEncoding.DecodeString(t.Secret)
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if err != nil {
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return false, err
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}
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secret, err := aesDecrypt(t.getEncryptionKey(), decodedStoredSecret)
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if err != nil {
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return false, err
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}
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secretStr := string(secret)
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return totp.Validate(passcode, secretStr), nil
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}
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// aesEncrypt encrypts text and given key with AES.
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func aesEncrypt(key, text []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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b := base64.StdEncoding.EncodeToString(text)
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ciphertext := make([]byte, aes.BlockSize+len(b))
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iv := ciphertext[:aes.BlockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return nil, err
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}
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cfb := cipher.NewCFBEncrypter(block, iv)
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cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
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return ciphertext, nil
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}
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// aesDecrypt decrypts text and given key with AES.
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func aesDecrypt(key, text []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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if len(text) < aes.BlockSize {
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return nil, errors.New("ciphertext too short")
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}
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iv := text[:aes.BlockSize]
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text = text[aes.BlockSize:]
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cfb := cipher.NewCFBDecrypter(block, iv)
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cfb.XORKeyStream(text, text)
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data, err := base64.StdEncoding.DecodeString(string(text))
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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// NewTwoFactor creates a new two-factor authentication token.
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func NewTwoFactor(t *TwoFactor) error {
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_, err := t.GenerateScratchToken()
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if err != nil {
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return err
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}
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_, err = x.Insert(t)
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return err
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}
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// UpdateTwoFactor updates a two-factor authentication token.
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func UpdateTwoFactor(t *TwoFactor) error {
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_, err := x.ID(t.ID).AllCols().Update(t)
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return err
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}
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// GetTwoFactorByUID returns the two-factor authentication token associated with
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// the user, if any.
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func GetTwoFactorByUID(uid int64) (*TwoFactor, error) {
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twofa := &TwoFactor{UID: uid}
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has, err := x.Get(twofa)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrTwoFactorNotEnrolled{uid}
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}
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return twofa, nil
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}
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// DeleteTwoFactorByID deletes two-factor authentication token by given ID.
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func DeleteTwoFactorByID(id, userID int64) error {
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cnt, err := x.ID(id).Delete(&TwoFactor{
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UID: userID,
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})
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if err != nil {
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return err
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} else if cnt != 1 {
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return ErrTwoFactorNotEnrolled{userID}
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}
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return nil
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}
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