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feat: migrate TOTP secrets to keying

- Currently the TOTP secrets are stored using the `secrets` module with
as key the MD5 hash of the Secretkey, the `secrets` module uses general
bad practices. This patch migrates the secrets to use the `keying`
module (#5041) which is easier to use and use better practices to store
secrets in databases.
- Migration test added.
- Remove the Forgejo migration databases, and let the gitea migration
databases also run forgejo migration databases. This is required as the
Forgejo migration is now also touching tables that the forgejo migration
didn't create itself.
This commit is contained in:
Gusted 2024-11-26 02:31:26 +01:00
parent ad70e7dfb3
commit a8c61532d2
No known key found for this signature in database
GPG key ID: FD821B732837125F
18 changed files with 149 additions and 47 deletions

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@ -5,17 +5,14 @@ package auth
import ( import (
"context" "context"
"crypto/md5"
"crypto/sha256" "crypto/sha256"
"crypto/subtle" "crypto/subtle"
"encoding/base32" "encoding/base32"
"encoding/base64"
"encoding/hex" "encoding/hex"
"fmt" "fmt"
"code.gitea.io/gitea/models/db" "code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/secret" "code.gitea.io/gitea/modules/keying"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/timeutil" "code.gitea.io/gitea/modules/timeutil"
"code.gitea.io/gitea/modules/util" "code.gitea.io/gitea/modules/util"
@ -51,7 +48,7 @@ func (err ErrTwoFactorNotEnrolled) Unwrap() error {
type TwoFactor struct { type TwoFactor struct {
ID int64 `xorm:"pk autoincr"` ID int64 `xorm:"pk autoincr"`
UID int64 `xorm:"UNIQUE"` UID int64 `xorm:"UNIQUE"`
Secret string Secret []byte `xorm:"BLOB"`
ScratchSalt string ScratchSalt string
ScratchHash string ScratchHash string
LastUsedPasscode string `xorm:"VARCHAR(10)"` LastUsedPasscode string `xorm:"VARCHAR(10)"`
@ -92,39 +89,35 @@ func (t *TwoFactor) VerifyScratchToken(token string) bool {
return subtle.ConstantTimeCompare([]byte(t.ScratchHash), []byte(tempHash)) == 1 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. // SetSecret sets the 2FA secret.
func (t *TwoFactor) SetSecret(secretString string) error { func (t *TwoFactor) SetSecret(secretString string) {
secretBytes, err := secret.AesEncrypt(t.getEncryptionKey(), []byte(secretString)) key := keying.DeriveKey(keying.ContextTOTP)
if err != nil { t.Secret = key.Encrypt([]byte(secretString), keying.ColumnAndID("secret", t.ID))
return err
}
t.Secret = base64.StdEncoding.EncodeToString(secretBytes)
return nil
} }
// ValidateTOTP validates the provided passcode. // ValidateTOTP validates the provided passcode.
func (t *TwoFactor) ValidateTOTP(passcode string) (bool, error) { func (t *TwoFactor) ValidateTOTP(passcode string) (bool, error) {
decodedStoredSecret, err := base64.StdEncoding.DecodeString(t.Secret) key := keying.DeriveKey(keying.ContextTOTP)
secret, err := key.Decrypt(t.Secret, keying.ColumnAndID("secret", t.ID))
if err != nil { if err != nil {
return false, err return false, err
} }
secretBytes, err := secret.AesDecrypt(t.getEncryptionKey(), decodedStoredSecret) return totp.Validate(passcode, string(secret)), nil
if err != nil {
return false, err
}
secretStr := string(secretBytes)
return totp.Validate(passcode, secretStr), nil
} }
// NewTwoFactor creates a new two-factor authentication token. // NewTwoFactor creates a new two-factor authentication token.
func NewTwoFactor(ctx context.Context, t *TwoFactor) error { func NewTwoFactor(ctx context.Context, t *TwoFactor, secret string) error {
_, err := db.GetEngine(ctx).Insert(t) return db.WithTx(ctx, func(ctx context.Context) error {
sess := db.GetEngine(ctx)
_, err := sess.Insert(t)
if err != nil {
return err return err
}
t.SetSecret(secret)
_, err = sess.Cols("secret").ID(t.ID).Update(t)
return err
})
} }
// UpdateTwoFactor updates a two-factor authentication token. // UpdateTwoFactor updates a two-factor authentication token.

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@ -1,7 +1,7 @@
- -
id: 1 id: 1
uid: 24 uid: 24
secret: KlDporn6Ile4vFcKI8z7Z6sqK1Scj2Qp0ovtUzCZO6jVbRW2lAoT7UDxDPtrab8d2B9zKOocBRdBJnS8orsrUNrsyETY+jJHb79M82uZRioKbRUz15sfOpmJmEzkFeSg6S4LicUBQos= secret: MrAed+7K+fKQKu1l3aU45oTDSWK/i5Ugtgk8CmORrKWTMwa2w97rniLU+h+2xq8ZF+16uuXGLzjWa0bOV5xg4NY6w5Ec/tkwQ5rEecOTvc/JZV5lrrlDi48B7Y5/lNcjAWBmH2nEUlM=
scratch_salt: Qb5bq2DyR2 scratch_salt: Qb5bq2DyR2
scratch_hash: 068eb9b8746e0bcfe332fac4457693df1bda55800eb0f6894d14ebb736ae6a24e0fc8fc5333c19f57f81599788f0b8e51ec1 scratch_hash: 068eb9b8746e0bcfe332fac4457693df1bda55800eb0f6894d14ebb736ae6a24e0fc8fc5333c19f57f81599788f0b8e51ec1
last_used_passcode: last_used_passcode:

View file

@ -86,6 +86,8 @@ var migrations = []*Migration{
NewMigration("Add `delete_branch_after_merge` to `auto_merge` table", AddDeleteBranchAfterMergeToAutoMerge), NewMigration("Add `delete_branch_after_merge` to `auto_merge` table", AddDeleteBranchAfterMergeToAutoMerge),
// v24 -> v25 // v24 -> v25
NewMigration("Add `purpose` column to `forgejo_auth_token` table", AddPurposeToForgejoAuthToken), NewMigration("Add `purpose` column to `forgejo_auth_token` table", AddPurposeToForgejoAuthToken),
// v25 -> v26
NewMigration("Migrate `secret` column to store keying material", MigrateTwoFactorToKeying),
} }
// GetCurrentDBVersion returns the current Forgejo database version. // GetCurrentDBVersion returns the current Forgejo database version.

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@ -0,0 +1,50 @@
// Copyright 2024 The Forgejo Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package forgejo_migrations //nolint:revive
import (
"context"
"crypto/md5"
"encoding/base64"
"code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/secret"
"code.gitea.io/gitea/modules/setting"
"xorm.io/xorm"
"xorm.io/xorm/schemas"
)
func MigrateTwoFactorToKeying(x *xorm.Engine) error {
var err error
switch x.Dialect().URI().DBType {
case schemas.MYSQL:
_, err = x.Exec("ALTER TABLE `two_factor` MODIFY `secret` BLOB")
case schemas.POSTGRES:
_, err = x.Exec("ALTER TABLE `two_factor` ALTER COLUMN `secret` SET DATA TYPE bytea USING secret::text::bytea")
}
if err != nil {
return err
}
oldEncryptionKey := md5.Sum([]byte(setting.SecretKey))
return db.Iterate(context.Background(), nil, func(ctx context.Context, bean *auth.TwoFactor) error {
decodedStoredSecret, err := base64.StdEncoding.DecodeString(string(bean.Secret))
if err != nil {
return err
}
secretBytes, err := secret.AesDecrypt(oldEncryptionKey[:], decodedStoredSecret)
if err != nil {
return err
}
bean.SetSecret(string(secretBytes))
_, err = db.GetEngine(ctx).Cols("secret").ID(bean.ID).Update(bean)
return err
})
}

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@ -0,0 +1,50 @@
// Copyright 2024 The Forgejo Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package forgejo_migrations //nolint:revive
import (
"testing"
"code.gitea.io/gitea/models/auth"
migration_tests "code.gitea.io/gitea/models/migrations/test"
"code.gitea.io/gitea/modules/keying"
"code.gitea.io/gitea/modules/timeutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func Test_MigrateTwoFactorToKeying(t *testing.T) {
type TwoFactor struct { //revive:disable-line:exported
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"`
}
// Prepare and load the testing database
x, deferable := migration_tests.PrepareTestEnv(t, 0, new(TwoFactor))
defer deferable()
if x == nil || t.Failed() {
return
}
cnt, err := x.Table("two_factor").Count()
require.NoError(t, err)
assert.EqualValues(t, 1, cnt)
require.NoError(t, MigrateTwoFactorToKeying(x))
var twofactor auth.TwoFactor
_, err = x.Table("two_factor").ID(1).Get(&twofactor)
require.NoError(t, err)
secretBytes, err := keying.DeriveKey(keying.ContextTOTP).Decrypt(twofactor.Secret, keying.ColumnAndID("secret", twofactor.ID))
require.NoError(t, err)
assert.Equal(t, []byte("AVDYS32OPIAYSNBG2NKYV4AHBVEMKKKIGBQ46OXTLMJO664G4TIECOGEANMSNBLS"), secretBytes)
}

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@ -0,0 +1,9 @@
-
id: 1
uid: 24
secret: MrAed+7K+fKQKu1l3aU45oTDSWK/i5Ugtgk8CmORrKWTMwa2w97rniLU+h+2xq8ZF+16uuXGLzjWa0bOV5xg4NY6w5Ec/tkwQ5rEecOTvc/JZV5lrrlDi48B7Y5/lNcjAWBmH2nEUlM=
scratch_salt: Qb5bq2DyR2
scratch_hash: 068eb9b8746e0bcfe332fac4457693df1bda55800eb0f6894d14ebb736ae6a24e0fc8fc5333c19f57f81599788f0b8e51ec1
last_used_passcode:
created_unix: 1564253724
updated_unix: 1564253724

View file

@ -45,8 +45,12 @@ func Init(ikm []byte) {
// This must be a hardcoded string and must not be arbitrarily constructed. // This must be a hardcoded string and must not be arbitrarily constructed.
type Context string type Context string
// Used for the `push_mirror` table. var (
var ContextPushMirror Context = "pushmirror" // Used for the `push_mirror` table.
ContextPushMirror Context = "pushmirror"
// Used for the `two_factor` table.
ContextTOTP Context = "totp"
)
// Derive *the* key for a given context, this is a determistic function. The // Derive *the* key for a given context, this is a determistic function. The
// same key will be provided for the same context. // same key will be provided for the same context.

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@ -220,11 +220,6 @@ func EnrollTwoFactorPost(ctx *context.Context) {
t = &auth.TwoFactor{ t = &auth.TwoFactor{
UID: ctx.Doer.ID, UID: ctx.Doer.ID,
} }
err = t.SetSecret(secret)
if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to set secret", err)
return
}
token, err := t.GenerateScratchToken() token, err := t.GenerateScratchToken()
if err != nil { if err != nil {
ctx.ServerError("SettingsTwoFactor: Failed to generate scratch token", err) ctx.ServerError("SettingsTwoFactor: Failed to generate scratch token", err)
@ -251,7 +246,7 @@ func EnrollTwoFactorPost(ctx *context.Context) {
return return
} }
if err = auth.NewTwoFactor(ctx, t); err != nil { if err = auth.NewTwoFactor(ctx, t, secret); err != nil {
// FIXME: We need to handle a unique constraint fail here it's entirely possible that another request has beaten us. // FIXME: We need to handle a unique constraint fail here it's entirely possible that another request has beaten us.
// If there is a unique constraint fail we should just tolerate the error // If there is a unique constraint fail we should just tolerate the error
ctx.ServerError("SettingsTwoFactor: Failed to save two factor", err) ctx.ServerError("SettingsTwoFactor: Failed to save two factor", err)

View file

@ -38,9 +38,8 @@ func TestAPITwoFactor(t *testing.T) {
tfa := &auth_model.TwoFactor{ tfa := &auth_model.TwoFactor{
UID: user.ID, UID: user.ID,
} }
require.NoError(t, tfa.SetSecret(otpKey.Secret()))
require.NoError(t, auth_model.NewTwoFactor(db.DefaultContext, tfa)) require.NoError(t, auth_model.NewTwoFactor(db.DefaultContext, tfa, otpKey.Secret()))
req = NewRequest(t, "GET", "/api/v1/user"). req = NewRequest(t, "GET", "/api/v1/user").
AddBasicAuth(user.Name) AddBasicAuth(user.Name)