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// Copyright 2021 The Gitea 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 migrations
import (
"crypto/sha256"
"fmt"
"golang.org/x/crypto/argon2"
"golang.org/x/crypto/bcrypt"
"golang.org/x/crypto/pbkdf2"
"golang.org/x/crypto/scrypt"
"xorm.io/builder"
"xorm.io/xorm"
)
func recalculateUserEmptyPWD(x *xorm.Engine) (err error) {
const (
algoBcrypt = "bcrypt"
algoScrypt = "scrypt"
algoArgon2 = "argon2"
algoPbkdf2 = "pbkdf2"
)
type User struct {
ID int64 `xorm:"pk autoincr"`
Passwd string `xorm:"NOT NULL"`
PasswdHashAlgo string `xorm:"NOT NULL DEFAULT 'argon2'"`
MustChangePassword bool `xorm:"NOT NULL DEFAULT false"`
LoginType int
LoginName string
Type int
Salt string `xorm:"VARCHAR(10)"`
}
// hashPassword hash password based on algo and salt
// state 461406070c
hashPassword := func(passwd, salt, algo string) string {
var tempPasswd []byte
switch algo {
case algoBcrypt:
tempPasswd, _ = bcrypt.GenerateFromPassword([]byte(passwd), bcrypt.DefaultCost)
return string(tempPasswd)
case algoScrypt:
tempPasswd, _ = scrypt.Key([]byte(passwd), []byte(salt), 65536, 16, 2, 50)
case algoArgon2:
tempPasswd = argon2.IDKey([]byte(passwd), []byte(salt), 2, 65536, 8, 50)
case algoPbkdf2:
fallthrough
default:
tempPasswd = pbkdf2.Key([]byte(passwd), []byte(salt), 10000, 50, sha256.New)
}
return fmt.Sprintf("%x", tempPasswd)
}
// ValidatePassword checks if given password matches the one belongs to the user.
// state 461406070c, changed since it's not necessary to be time constant
ValidatePassword := func(u *User, passwd string) bool {
tempHash := hashPassword(passwd, u.Salt, u.PasswdHashAlgo)
if u.PasswdHashAlgo != algoBcrypt && u.Passwd == tempHash {
return true
}
if u.PasswdHashAlgo == algoBcrypt && bcrypt.CompareHashAndPassword([]byte(u.Passwd), []byte(passwd)) == nil {
return true
}
return false
}
sess := x.NewSession()
defer sess.Close()
const batchSize = 100
for start := 0; ; start += batchSize {
users := make([]*User, 0, batchSize)
if err = sess.Limit(batchSize, start).Where(builder.Neq{"passwd": ""}, 0).Find(&users); err != nil {
return
}
if len(users) == 0 {
break
}
if err = sess.Begin(); err != nil {
return
}
for _, user := range users {
if ValidatePassword(user, "") {
user.Passwd = ""
user.Salt = ""
user.PasswdHashAlgo = ""
if _, err = sess.ID(user.ID).Cols("passwd", "salt", "passwd_hash_algo").Update(user); err != nil {
return err
}
}
}
if err = sess.Commit(); err != nil {
return
}
}
// delete salt and algo where password is empty
if _, err = sess.Where(builder.Eq{"passwd": ""}.And(builder.Neq{"salt": ""}.Or(builder.Neq{"passwd_hash_algo": ""}))).
Cols("salt", "passwd_hash_algo").Update(&User{}); err != nil {
return err
}
return sess.Commit()
}
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