forgejo/models/auth/twofactor.go
Gusted 0d8478cff8
[GITEA] Drop sha256-simd in favor of stdlib
- In Go 1.21 the crypto/sha256 [got a massive
improvement](https://go.dev/doc/go1.21#crypto/sha256) by utilizing the
SHA instructions for AMD64 CPUs, which sha256-simd already was doing.
The performance is now on par and I think it's preferable to use the
standard library rather than a package when possible.

```
cpu: AMD Ryzen 5 3600X 6-Core Processor
                │  simd.txt   │               go.txt                │
                │   sec/op    │    sec/op     vs base               │
Hash/8Bytes-12    63.25n ± 1%    73.38n ± 1%  +16.02% (p=0.002 n=6)
Hash/64Bytes-12   98.73n ± 1%   105.30n ± 1%   +6.65% (p=0.002 n=6)
Hash/1K-12        567.2n ± 1%    572.8n ± 1%   +0.99% (p=0.002 n=6)
Hash/8K-12        4.062µ ± 1%    4.062µ ± 1%        ~ (p=0.396 n=6)
Hash/1M-12        512.1µ ± 0%    510.6µ ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        2.556m ± 1%    2.564m ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       5.112m ± 0%    5.127m ± 0%        ~ (p=0.093 n=6)
geomean           13.82µ         14.27µ        +3.28%

                │   simd.txt   │               go.txt                │
                │     B/s      │     B/s       vs base               │
Hash/8Bytes-12    120.6Mi ± 1%   104.0Mi ± 1%  -13.81% (p=0.002 n=6)
Hash/64Bytes-12   618.2Mi ± 1%   579.8Mi ± 1%   -6.22% (p=0.002 n=6)
Hash/1K-12        1.682Gi ± 1%   1.665Gi ± 1%   -0.98% (p=0.002 n=6)
Hash/8K-12        1.878Gi ± 1%   1.878Gi ± 1%        ~ (p=0.310 n=6)
Hash/1M-12        1.907Gi ± 0%   1.913Gi ± 1%        ~ (p=0.485 n=6)
Hash/5M-12        1.911Gi ± 1%   1.904Gi ± 0%        ~ (p=0.093 n=6)
Hash/10M-12       1.910Gi ± 0%   1.905Gi ± 0%        ~ (p=0.093 n=6)
geomean           1.066Gi        1.032Gi        -3.18%
```

(cherry picked from commit abd94ff5b5)
(cherry picked from commit 15e81637ab)

Conflicts:
	go.mod
	https://codeberg.org/forgejo/forgejo/pulls/1581
(cherry picked from commit 5caea2d75aeac78fb306f58a3cf7809d5b70c7f2)
(cherry picked from commit 08da542cce)
(cherry picked from commit d71a8cc9fb)
(cherry picked from commit 63c9fc2bee)
(cherry picked from commit e1db85d48a)
(cherry picked from commit 5e86a5d2d1)
2023-11-13 14:06:31 +01:00

167 lines
4.7 KiB
Go

// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package auth
import (
"context"
"crypto/md5"
"crypto/sha256"
"crypto/subtle"
"encoding/base32"
"encoding/base64"
"encoding/hex"
"fmt"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/secret"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util"
"github.com/pquerna/otp/totp"
"golang.org/x/crypto/pbkdf2"
)
//
// Two-factor authentication
//
// ErrTwoFactorNotEnrolled indicates that a user is not enrolled in two-factor authentication.
type ErrTwoFactorNotEnrolled struct {
UID int64
}
// IsErrTwoFactorNotEnrolled checks if an error is a ErrTwoFactorNotEnrolled.
func IsErrTwoFactorNotEnrolled(err error) bool {
_, ok := err.(ErrTwoFactorNotEnrolled)
return ok
}
func (err ErrTwoFactorNotEnrolled) Error() string {
return fmt.Sprintf("user not enrolled in 2FA [uid: %d]", err.UID)
}
// Unwrap unwraps this as a ErrNotExist err
func (err ErrTwoFactorNotEnrolled) Unwrap() error {
return util.ErrNotExist
}
// TwoFactor represents a two-factor authentication token.
type TwoFactor struct {
ID int64 `xorm:"pk autoincr"`
UID int64 `xorm:"UNIQUE"`
Secret string
ScratchSalt string
ScratchHash string
LastUsedPasscode string `xorm:"VARCHAR(10)"`
CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
}
func init() {
db.RegisterModel(new(TwoFactor))
}
// GenerateScratchToken recreates the scratch token the user is using.
func (t *TwoFactor) GenerateScratchToken() (string, error) {
tokenBytes, err := util.CryptoRandomBytes(6)
if err != nil {
return "", err
}
// these chars are specially chosen, avoid ambiguous chars like `0`, `O`, `1`, `I`.
const base32Chars = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"
token := base32.NewEncoding(base32Chars).WithPadding(base32.NoPadding).EncodeToString(tokenBytes)
t.ScratchSalt, _ = util.CryptoRandomString(10)
t.ScratchHash = HashToken(token, t.ScratchSalt)
return token, nil
}
// HashToken return the hashable salt
func HashToken(token, salt string) string {
tempHash := pbkdf2.Key([]byte(token), []byte(salt), 10000, 50, sha256.New)
return hex.EncodeToString(tempHash)
}
// VerifyScratchToken verifies if the specified scratch token is valid.
func (t *TwoFactor) VerifyScratchToken(token string) bool {
if len(token) == 0 {
return false
}
tempHash := HashToken(token, t.ScratchSalt)
return subtle.ConstantTimeCompare([]byte(t.ScratchHash), []byte(tempHash)) == 1
}
func (t *TwoFactor) getEncryptionKey() []byte {
k := md5.Sum([]byte(setting.SecretKey))
return k[:]
}
// SetSecret sets the 2FA secret.
func (t *TwoFactor) SetSecret(secretString string) error {
secretBytes, err := secret.AesEncrypt(t.getEncryptionKey(), []byte(secretString))
if err != nil {
return err
}
t.Secret = base64.StdEncoding.EncodeToString(secretBytes)
return nil
}
// ValidateTOTP validates the provided passcode.
func (t *TwoFactor) ValidateTOTP(passcode string) (bool, error) {
decodedStoredSecret, err := base64.StdEncoding.DecodeString(t.Secret)
if err != nil {
return false, err
}
secretBytes, err := secret.AesDecrypt(t.getEncryptionKey(), decodedStoredSecret)
if err != nil {
return false, err
}
secretStr := string(secretBytes)
return totp.Validate(passcode, secretStr), nil
}
// NewTwoFactor creates a new two-factor authentication token.
func NewTwoFactor(ctx context.Context, t *TwoFactor) error {
_, err := db.GetEngine(ctx).Insert(t)
return err
}
// UpdateTwoFactor updates a two-factor authentication token.
func UpdateTwoFactor(ctx context.Context, t *TwoFactor) error {
_, err := db.GetEngine(ctx).ID(t.ID).AllCols().Update(t)
return err
}
// GetTwoFactorByUID returns the two-factor authentication token associated with
// the user, if any.
func GetTwoFactorByUID(ctx context.Context, uid int64) (*TwoFactor, error) {
twofa := &TwoFactor{}
has, err := db.GetEngine(ctx).Where("uid=?", uid).Get(twofa)
if err != nil {
return nil, err
} else if !has {
return nil, ErrTwoFactorNotEnrolled{uid}
}
return twofa, nil
}
// HasTwoFactorByUID returns the two-factor authentication token associated with
// the user, if any.
func HasTwoFactorByUID(ctx context.Context, uid int64) (bool, error) {
return db.GetEngine(ctx).Where("uid=?", uid).Exist(&TwoFactor{})
}
// DeleteTwoFactorByID deletes two-factor authentication token by given ID.
func DeleteTwoFactorByID(ctx context.Context, id, userID int64) error {
cnt, err := db.GetEngine(ctx).ID(id).Delete(&TwoFactor{
UID: userID,
})
if err != nil {
return err
} else if cnt != 1 {
return ErrTwoFactorNotEnrolled{userID}
}
return nil
}