[SECURITY] Rework long-term authentication

- This is a 'front-port' of the already existing patch on v1.21 and
v1.20, but applied on top of what Gitea has done to rework the LTA
mechanism. Forgejo will stick with the reworked mechanism by the Forgejo
Security team for the time being. The removal of legacy code (AES-GCM) has been
left out.
- The current architecture is inherently insecure, because you can
construct the 'secret' cookie value with values that are available in
the database. Thus provides zero protection when a database is
dumped/leaked.
- This patch implements a new architecture that's inspired from: [Paragonie Initiative](https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence#secure-remember-me-cookies).
- Integration testing is added to ensure the new mechanism works.
- Removes a setting, because it's not used anymore.

(cherry picked from commit e3d6622a63)
(cherry picked from commit fef1a6dac5)
(cherry picked from commit b0c5165145)
(cherry picked from commit 7ad51b9f8d)
(cherry picked from commit 64f053f383)
(cherry picked from commit f5e78e4c20)

Conflicts:
	services/auth/auth_token_test.go
	https://codeberg.org/forgejo/forgejo/pulls/2069
(cherry picked from commit f69fc23d4b)
(cherry picked from commit d955ab3ab0)

.deadcode-out

@@ -31,7 +31,6 @@ package "code.gitea.io/gitea/models/asymkey"
 	func HasDeployKey
 
 package "code.gitea.io/gitea/models/auth"
-	func DeleteAuthTokenByID
 	func GetSourceByName
 	func GetWebAuthnCredentialByID
 	func WebAuthnCredentials

models/auth/auth_token.go

@@ -1,60 +1,96 @@
-// Copyright 2023 The Gitea Authors. All rights reserved.
+// Copyright 2023 The Forgejo Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
 package auth
 
 import (
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"time"
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
-
-	"xorm.io/builder"
 )
 
-var ErrAuthTokenNotExist = util.NewNotExistErrorf("auth token does not exist")
+// AuthorizationToken represents a authorization token to a user.
+type AuthorizationToken struct {
+	ID              int64  `xorm:"pk autoincr"`
+	UID             int64  `xorm:"INDEX"`
+	LookupKey       string `xorm:"INDEX UNIQUE"`
+	HashedValidator string
+	Expiry          timeutil.TimeStamp
+}
 
-type AuthToken struct { //nolint:revive
+// TableName provides the real table name.
-	ID          string `xorm:"pk"`
+func (AuthorizationToken) TableName() string {
-	TokenHash   string
+	return "forgejo_auth_token"
-	UserID      int64              `xorm:"INDEX"`
-	ExpiresUnix timeutil.TimeStamp `xorm:"INDEX"`
 }
 
 func init() {
-	db.RegisterModel(new(AuthToken))
+	db.RegisterModel(new(AuthorizationToken))
 }
 
-func InsertAuthToken(ctx context.Context, t *AuthToken) error {
+// IsExpired returns if the authorization token is expired.
-	_, err := db.GetEngine(ctx).Insert(t)
+func (authToken *AuthorizationToken) IsExpired() bool {
-	return err
+	return authToken.Expiry.AsLocalTime().Before(time.Now())
 }
 
-func GetAuthTokenByID(ctx context.Context, id string) (*AuthToken, error) {
+// GenerateAuthToken generates a new authentication token for the given user.
-	at := &AuthToken{}
+// It returns the lookup key and validator values that should be passed to the
+// user via a long-term cookie.
+func GenerateAuthToken(ctx context.Context, userID int64, expiry timeutil.TimeStamp) (lookupKey, validator string, err error) {
+	// Request 64 random bytes. The first 32 bytes will be used for the lookupKey
+	// and the other 32 bytes will be used for the validator.
+	rBytes, err := util.CryptoRandomBytes(64)
+	if err != nil {
+		return "", "", err
+	}
+	hexEncoded := hex.EncodeToString(rBytes)
+	validator, lookupKey = hexEncoded[64:], hexEncoded[:64]
 
-	has, err := db.GetEngine(ctx).ID(id).Get(at)
+	_, err = db.GetEngine(ctx).Insert(&AuthorizationToken{
+		UID:             userID,
+		Expiry:          expiry,
+		LookupKey:       lookupKey,
+		HashedValidator: HashValidator(rBytes[32:]),
+	})
+	return lookupKey, validator, err
+}
+
+// FindAuthToken will find a authorization token via the lookup key.
+func FindAuthToken(ctx context.Context, lookupKey string) (*AuthorizationToken, error) {
+	var authToken AuthorizationToken
+	has, err := db.GetEngine(ctx).Where("lookup_key = ?", lookupKey).Get(&authToken)
 	if err != nil {
 		return nil, err
+	} else if !has {
+		return nil, fmt.Errorf("lookup key %q: %w", lookupKey, util.ErrNotExist)
 	}
-	if !has {
+	return &authToken, nil
-		return nil, ErrAuthTokenNotExist
-	}
-	return at, nil
 }
 
-func UpdateAuthTokenByID(ctx context.Context, t *AuthToken) error {
+// DeleteAuthToken will delete the authorization token.
-	_, err := db.GetEngine(ctx).ID(t.ID).Cols("token_hash", "expires_unix").Update(t)
+func DeleteAuthToken(ctx context.Context, authToken *AuthorizationToken) error {
+	_, err := db.DeleteByBean(ctx, authToken)
 	return err
 }
 
-func DeleteAuthTokenByID(ctx context.Context, id string) error {
+// DeleteAuthTokenByUser will delete all authorization tokens for the user.
-	_, err := db.GetEngine(ctx).ID(id).Delete(&AuthToken{})
+func DeleteAuthTokenByUser(ctx context.Context, userID int64) error {
+	if userID == 0 {
+		return nil
+	}
+
+	_, err := db.DeleteByBean(ctx, &AuthorizationToken{UID: userID})
 	return err
 }
 
-func DeleteExpiredAuthTokens(ctx context.Context) error {
+// HashValidator will return a hexified hashed version of the validator.
-	_, err := db.GetEngine(ctx).Where(builder.Lt{"expires_unix": timeutil.TimeStampNow()}).Delete(&AuthToken{})
+func HashValidator(validator []byte) string {
-	return err
+	h := sha256.New()
+	h.Write(validator)
+	return hex.EncodeToString(h.Sum(nil))
 }

models/forgejo_migrations/migrate.go

@@ -41,6 +41,8 @@ var migrations = []*Migration{
 	NewMigration("Add Forgejo Blocked Users table", forgejo_v1_20.AddForgejoBlockedUser),
 	// v1 -> v2
 	NewMigration("create the forgejo_sem_ver table", forgejo_v1_20.CreateSemVerTable),
+	// v2 -> v3
+	NewMigration("create the forgejo_auth_token table", forgejo_v1_20.CreateAuthorizationTokenTable),
 }
 
 // GetCurrentDBVersion returns the current Forgejo database version.

models/forgejo_migrations/v1_20/v3.go

@@ -0,0 +1,26 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package forgejo_v1_20 //nolint:revive
+
+import (
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+type AuthorizationToken struct {
+	ID              int64  `xorm:"pk autoincr"`
+	UID             int64  `xorm:"INDEX"`
+	LookupKey       string `xorm:"INDEX UNIQUE"`
+	HashedValidator string
+	Expiry          timeutil.TimeStamp
+}
+
+func (AuthorizationToken) TableName() string {
+	return "forgejo_auth_token"
+}
+
+func CreateAuthorizationTokenTable(x *xorm.Engine) error {
+	return x.Sync(new(AuthorizationToken))
+}

models/user/user.go

@@ -385,6 +385,11 @@ func (u *User) SetPassword(passwd string) (err error) {
 		return nil
 	}
 
+	// Invalidate all authentication tokens for this user.
+	if err := auth.DeleteAuthTokenByUser(db.DefaultContext, u.ID); err != nil {
+		return err
+	}
+
 	if u.Salt, err = GetUserSalt(); err != nil {
 		return err
 	}

modules/context/context_cookie.go

@@ -7,7 +7,10 @@ import (
 	"net/http"
 	"strings"
 
+	auth_model "code.gitea.io/gitea/models/auth"
+	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/web/middleware"
 )
 
@@ -40,3 +43,14 @@ func (ctx *Context) DeleteSiteCookie(name string) {
 func (ctx *Context) GetSiteCookie(name string) string {
 	return middleware.GetSiteCookie(ctx.Req, name)
 }
+
+// SetLTACookie will generate a LTA token and add it as an cookie.
+func (ctx *Context) SetLTACookie(u *user_model.User) error {
+	days := 86400 * setting.LogInRememberDays
+	lookup, validator, err := auth_model.GenerateAuthToken(ctx, u.ID, timeutil.TimeStampNow().Add(int64(days)))
+	if err != nil {
+		return err
+	}
+	ctx.SetSiteCookie(setting.CookieRememberName, lookup+":"+validator, days)
+	return nil
+}

routers/install/install.go

@@ -27,14 +27,12 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/templates"
-	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/translation"
 	"code.gitea.io/gitea/modules/user"
 	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/modules/web/middleware"
 	"code.gitea.io/gitea/routers/common"
-	auth_service "code.gitea.io/gitea/services/auth"
 	"code.gitea.io/gitea/services/forms"
 
 	"gitea.com/go-chi/session"
@@ -549,20 +547,13 @@ func SubmitInstall(ctx *context.Context) {
 			u, _ = user_model.GetUserByName(ctx, u.Name)
 		}
 
-		nt, token, err := auth_service.CreateAuthTokenForUserID(ctx, u.ID)
+		if err := ctx.SetLTACookie(u); err != nil {
-		if err != nil {
-			ctx.ServerError("CreateAuthTokenForUserID", err)
-			return
-		}
-
-		ctx.SetSiteCookie(setting.CookieRememberName, nt.ID+":"+token, setting.LogInRememberDays*timeutil.Day)
-
-		// Auto-login for admin
-		if err = ctx.Session.Set("uid", u.ID); err != nil {
 			ctx.RenderWithErr(ctx.Tr("install.save_config_failed", err), tplInstall, &form)
 			return
 		}
-		if err = ctx.Session.Set("uname", u.Name); err != nil {
+
+		// Auto-login for admin
+		if err = ctx.Session.Set("uid", u.ID); err != nil {
 			ctx.RenderWithErr(ctx.Tr("install.save_config_failed", err), tplInstall, &form)
 			return
 		}

routers/web/auth/auth.go

@@ -5,6 +5,8 @@
 package auth
 
 import (
+	"crypto/subtle"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"net/http"
@@ -52,23 +54,39 @@ func autoSignIn(ctx *context.Context) (bool, error) {
 		}
 	}()
 
-	if err := auth.DeleteExpiredAuthTokens(ctx); err != nil {
+	authCookie := ctx.GetSiteCookie(setting.CookieRememberName)
-		log.Error("Failed to delete expired auth tokens: %v", err)
+	if len(authCookie) == 0 {
+		return false, nil
 	}
 
-	t, err := auth_service.CheckAuthToken(ctx, ctx.GetSiteCookie(setting.CookieRememberName))
+	lookupKey, validator, found := strings.Cut(authCookie, ":")
+	if !found {
+		return false, nil
+	}
+
+	authToken, err := auth.FindAuthToken(ctx, lookupKey)
 	if err != nil {
-		switch err {
+		if errors.Is(err, util.ErrNotExist) {
-		case auth_service.ErrAuthTokenInvalidFormat, auth_service.ErrAuthTokenExpired:
 			return false, nil
 		}
 		return false, err
 	}
-	if t == nil {
+
+	if authToken.IsExpired() {
+		err = auth.DeleteAuthToken(ctx, authToken)
+		return false, err
+	}
+
+	rawValidator, err := hex.DecodeString(validator)
+	if err != nil {
+		return false, err
+	}
+
+	if subtle.ConstantTimeCompare([]byte(authToken.HashedValidator), []byte(auth.HashValidator(rawValidator))) == 0 {
 		return false, nil
 	}
 
-	u, err := user_model.GetUserByID(ctx, t.UserID)
+	u, err := user_model.GetUserByID(ctx, authToken.UID)
 	if err != nil {
 		if !user_model.IsErrUserNotExist(err) {
 			return false, fmt.Errorf("GetUserByID: %w", err)
@@ -78,17 +96,9 @@ func autoSignIn(ctx *context.Context) (bool, error) {
 
 	isSucceed = true
 
-	nt, token, err := auth_service.RegenerateAuthToken(ctx, t)
-	if err != nil {
-		return false, err
-	}
-
-	ctx.SetSiteCookie(setting.CookieRememberName, nt.ID+":"+token, setting.LogInRememberDays*timeutil.Day)
-
 	if err := updateSession(ctx, nil, map[string]any{
 		// Set session IDs
 		"uid": u.ID,
-		"uname": u.Name,
 	}); err != nil {
 		return false, fmt.Errorf("unable to updateSession: %w", err)
 	}
@@ -124,10 +134,6 @@ func CheckAutoLogin(ctx *context.Context) bool {
 	// Check auto-login
 	isSucceed, err := autoSignIn(ctx)
 	if err != nil {
-		if errors.Is(err, auth_service.ErrAuthTokenInvalidHash) {
-			ctx.Flash.Error(ctx.Tr("auth.remember_me.compromised"), true)
-			return false
-		}
 		ctx.ServerError("autoSignIn", err)
 		return true
 	}
@@ -302,13 +308,10 @@ func handleSignIn(ctx *context.Context, u *user_model.User, remember bool) {
 
 func handleSignInFull(ctx *context.Context, u *user_model.User, remember, obeyRedirect bool) string {
 	if remember {
-		nt, token, err := auth_service.CreateAuthTokenForUserID(ctx, u.ID)
+		if err := ctx.SetLTACookie(u); err != nil {
-		if err != nil {
+			ctx.ServerError("GenerateAuthToken", err)
-			ctx.ServerError("CreateAuthTokenForUserID", err)
 			return setting.AppSubURL + "/"
 		}
-
-		ctx.SetSiteCookie(setting.CookieRememberName, nt.ID+":"+token, setting.LogInRememberDays*timeutil.Day)
 	}
 
 	if err := updateSession(ctx, []string{
@@ -322,7 +325,6 @@ func handleSignInFull(ctx *context.Context, u *user_model.User, remember, obeyRe
 		"linkAccount",
 	}, map[string]any{
 		"uid": u.ID,
-		"uname": u.Name,
 	}); err != nil {
 		ctx.ServerError("RegenerateSession", err)
 		return setting.AppSubURL + "/"
@@ -740,7 +742,6 @@ func handleAccountActivation(ctx *context.Context, user *user_model.User) {
 
 	if err := updateSession(ctx, nil, map[string]any{
 		"uid": user.ID,
-		"uname": user.Name,
 	}); err != nil {
 		log.Error("Unable to regenerate session for user: %-v with email: %s: %v", user, user.Email, err)
 		ctx.ServerError("ActivateUserEmail", err)

routers/web/auth/oauth.go

@@ -1124,7 +1124,6 @@ func handleOAuth2SignIn(ctx *context.Context, source *auth.Source, u *user_model
 	if !needs2FA {
 		if err := updateSession(ctx, nil, map[string]any{
 			"uid": u.ID,
-			"uname": u.Name,
 		}); err != nil {
 			ctx.ServerError("updateSession", err)
 			return

routers/web/user/setting/account.go

@@ -78,6 +78,15 @@ func AccountPost(ctx *context.Context) {
 			ctx.ServerError("UpdateUser", err)
 			return
 		}
+
+		// Re-generate LTA cookie.
+		if len(ctx.GetSiteCookie(setting.CookieRememberName)) != 0 {
+			if err := ctx.SetLTACookie(ctx.Doer); err != nil {
+				ctx.ServerError("SetLTACookie", err)
+				return
+			}
+		}
+
 		log.Trace("User password updated: %s", ctx.Doer.Name)
 		ctx.Flash.Success(ctx.Tr("settings.change_password_success"))
 	}

services/auth/auth.go

@@ -76,10 +76,6 @@ func handleSignIn(resp http.ResponseWriter, req *http.Request, sess SessionStore
 	if err != nil {
 		log.Error(fmt.Sprintf("Error setting session: %v", err))
 	}
-	err = sess.Set("uname", user.Name)
-	if err != nil {
-		log.Error(fmt.Sprintf("Error setting session: %v", err))
-	}
 
 	// Language setting of the user overwrites the one previously set
 	// If the user does not have a locale set, we save the current one.

services/auth/auth_token.go

@@ -1,123 +0,0 @@
-// Copyright 2023 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package auth
-
-import (
-	"context"
-	"crypto/sha256"
-	"crypto/subtle"
-	"encoding/hex"
-	"errors"
-	"strings"
-	"time"
-
-	auth_model "code.gitea.io/gitea/models/auth"
-	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/timeutil"
-	"code.gitea.io/gitea/modules/util"
-)
-
-// Based on https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence#secure-remember-me-cookies
-
-// The auth token consists of two parts: ID and token hash
-// Every device login creates a new auth token with an individual id and hash.
-// If a device uses the token to login into the instance, a fresh token gets generated which has the same id but a new hash.
-
-var (
-	ErrAuthTokenInvalidFormat = util.NewInvalidArgumentErrorf("auth token has an invalid format")
-	ErrAuthTokenExpired       = util.NewInvalidArgumentErrorf("auth token has expired")
-	ErrAuthTokenInvalidHash   = util.NewInvalidArgumentErrorf("auth token is invalid")
-)
-
-func CheckAuthToken(ctx context.Context, value string) (*auth_model.AuthToken, error) {
-	if len(value) == 0 {
-		return nil, nil
-	}
-
-	parts := strings.SplitN(value, ":", 2)
-	if len(parts) != 2 {
-		return nil, ErrAuthTokenInvalidFormat
-	}
-
-	t, err := auth_model.GetAuthTokenByID(ctx, parts[0])
-	if err != nil {
-		if errors.Is(err, util.ErrNotExist) {
-			return nil, ErrAuthTokenExpired
-		}
-		return nil, err
-	}
-
-	if t.ExpiresUnix < timeutil.TimeStampNow() {
-		return nil, ErrAuthTokenExpired
-	}
-
-	hashedToken := sha256.Sum256([]byte(parts[1]))
-
-	if subtle.ConstantTimeCompare([]byte(t.TokenHash), []byte(hex.EncodeToString(hashedToken[:]))) == 0 {
-		// If an attacker steals a token and uses the token to create a new session the hash gets updated.
-		// When the victim uses the old token the hashes don't match anymore and the victim should be notified about the compromised token.
-		return nil, ErrAuthTokenInvalidHash
-	}
-
-	return t, nil
-}
-
-func RegenerateAuthToken(ctx context.Context, t *auth_model.AuthToken) (*auth_model.AuthToken, string, error) {
-	token, hash, err := generateTokenAndHash()
-	if err != nil {
-		return nil, "", err
-	}
-
-	newToken := &auth_model.AuthToken{
-		ID:          t.ID,
-		TokenHash:   hash,
-		UserID:      t.UserID,
-		ExpiresUnix: timeutil.TimeStampNow().AddDuration(time.Duration(setting.LogInRememberDays*24) * time.Hour),
-	}
-
-	if err := auth_model.UpdateAuthTokenByID(ctx, newToken); err != nil {
-		return nil, "", err
-	}
-
-	return newToken, token, nil
-}
-
-func CreateAuthTokenForUserID(ctx context.Context, userID int64) (*auth_model.AuthToken, string, error) {
-	t := &auth_model.AuthToken{
-		UserID:      userID,
-		ExpiresUnix: timeutil.TimeStampNow().AddDuration(time.Duration(setting.LogInRememberDays*24) * time.Hour),
-	}
-
-	var err error
-	t.ID, err = util.CryptoRandomString(10)
-	if err != nil {
-		return nil, "", err
-	}
-
-	token, hash, err := generateTokenAndHash()
-	if err != nil {
-		return nil, "", err
-	}
-
-	t.TokenHash = hash
-
-	if err := auth_model.InsertAuthToken(ctx, t); err != nil {
-		return nil, "", err
-	}
-
-	return t, token, nil
-}
-
-func generateTokenAndHash() (string, string, error) {
-	buf, err := util.CryptoRandomBytes(32)
-	if err != nil {
-		return "", "", err
-	}
-
-	token := hex.EncodeToString(buf)
-
-	hashedToken := sha256.Sum256([]byte(token))
-
-	return token, hex.EncodeToString(hashedToken[:]), nil
-}

services/auth/auth_token_test.go

@@ -1,107 +0,0 @@
-// Copyright 2023 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package auth
-
-import (
-	"testing"
-	"time"
-
-	auth_model "code.gitea.io/gitea/models/auth"
-	"code.gitea.io/gitea/models/db"
-	"code.gitea.io/gitea/models/unittest"
-	"code.gitea.io/gitea/modules/timeutil"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestCheckAuthToken(t *testing.T) {
-	assert.NoError(t, unittest.PrepareTestDatabase())
-
-	t.Run("Empty", func(t *testing.T) {
-		token, err := CheckAuthToken(db.DefaultContext, "")
-		assert.NoError(t, err)
-		assert.Nil(t, token)
-	})
-
-	t.Run("InvalidFormat", func(t *testing.T) {
-		token, err := CheckAuthToken(db.DefaultContext, "dummy")
-		assert.ErrorIs(t, err, ErrAuthTokenInvalidFormat)
-		assert.Nil(t, token)
-	})
-
-	t.Run("NotFound", func(t *testing.T) {
-		token, err := CheckAuthToken(db.DefaultContext, "notexists:dummy")
-		assert.ErrorIs(t, err, ErrAuthTokenExpired)
-		assert.Nil(t, token)
-	})
-
-	t.Run("Expired", func(t *testing.T) {
-		timeutil.MockSet(time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC))
-
-		at, token, err := CreateAuthTokenForUserID(db.DefaultContext, 2)
-		assert.NoError(t, err)
-		assert.NotNil(t, at)
-		assert.NotEmpty(t, token)
-
-		timeutil.MockUnset()
-
-		at2, err := CheckAuthToken(db.DefaultContext, at.ID+":"+token)
-		assert.ErrorIs(t, err, ErrAuthTokenExpired)
-		assert.Nil(t, at2)
-
-		assert.NoError(t, auth_model.DeleteAuthTokenByID(db.DefaultContext, at.ID))
-	})
-
-	t.Run("InvalidHash", func(t *testing.T) {
-		at, token, err := CreateAuthTokenForUserID(db.DefaultContext, 2)
-		assert.NoError(t, err)
-		assert.NotNil(t, at)
-		assert.NotEmpty(t, token)
-
-		at2, err := CheckAuthToken(db.DefaultContext, at.ID+":"+token+"dummy")
-		assert.ErrorIs(t, err, ErrAuthTokenInvalidHash)
-		assert.Nil(t, at2)
-
-		assert.NoError(t, auth_model.DeleteAuthTokenByID(db.DefaultContext, at.ID))
-	})
-
-	t.Run("Valid", func(t *testing.T) {
-		at, token, err := CreateAuthTokenForUserID(db.DefaultContext, 2)
-		assert.NoError(t, err)
-		assert.NotNil(t, at)
-		assert.NotEmpty(t, token)
-
-		at2, err := CheckAuthToken(db.DefaultContext, at.ID+":"+token)
-		assert.NoError(t, err)
-		assert.NotNil(t, at2)
-
-		assert.NoError(t, auth_model.DeleteAuthTokenByID(db.DefaultContext, at.ID))
-	})
-}
-
-func TestRegenerateAuthToken(t *testing.T) {
-	assert.NoError(t, unittest.PrepareTestDatabase())
-
-	timeutil.MockSet(time.Date(2023, 1, 1, 0, 0, 0, 0, time.UTC))
-	defer timeutil.MockUnset()
-
-	at, token, err := CreateAuthTokenForUserID(db.DefaultContext, 2)
-	assert.NoError(t, err)
-	assert.NotNil(t, at)
-	assert.NotEmpty(t, token)
-
-	timeutil.MockSet(time.Date(2023, 1, 1, 0, 0, 1, 0, time.UTC))
-
-	at2, token2, err := RegenerateAuthToken(db.DefaultContext, at)
-	assert.NoError(t, err)
-	assert.NotNil(t, at2)
-	assert.NotEmpty(t, token2)
-
-	assert.Equal(t, at.ID, at2.ID)
-	assert.Equal(t, at.UserID, at2.UserID)
-	assert.NotEqual(t, token, token2)
-	assert.NotEqual(t, at.ExpiresUnix, at2.ExpiresUnix)
-
-	assert.NoError(t, auth_model.DeleteAuthTokenByID(db.DefaultContext, at.ID))
-}

tests/integration/auth_token_test.go

@@ -0,0 +1,163 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"encoding/hex"
+	"net/http"
+	"net/url"
+	"strings"
+	"testing"
+
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// GetSessionForLTACookie returns a new session with only the LTA cookie being set.
+func GetSessionForLTACookie(t *testing.T, ltaCookie *http.Cookie) *TestSession {
+	t.Helper()
+
+	ch := http.Header{}
+	ch.Add("Cookie", ltaCookie.String())
+	cr := http.Request{Header: ch}
+
+	session := emptyTestSession(t)
+	baseURL, err := url.Parse(setting.AppURL)
+	assert.NoError(t, err)
+	session.jar.SetCookies(baseURL, cr.Cookies())
+
+	return session
+}
+
+// GetLTACookieValue returns the value of the LTA cookie.
+func GetLTACookieValue(t *testing.T, sess *TestSession) string {
+	t.Helper()
+
+	rememberCookie := sess.GetCookie(setting.CookieRememberName)
+	assert.NotNil(t, rememberCookie)
+
+	cookieValue, err := url.QueryUnescape(rememberCookie.Value)
+	assert.NoError(t, err)
+
+	return cookieValue
+}
+
+// TestSessionCookie checks if the session cookie provides authentication.
+func TestSessionCookie(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	sess := loginUser(t, "user1")
+	assert.NotNil(t, sess.GetCookie(setting.SessionConfig.CookieName))
+
+	req := NewRequest(t, "GET", "/user/settings")
+	sess.MakeRequest(t, req, http.StatusOK)
+}
+
+// TestLTACookie checks if the LTA cookie that's returned is valid, exists in the database
+// and provides authentication of no session cookie is present.
+func TestLTACookie(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+	sess := emptyTestSession(t)
+
+	req := NewRequestWithValues(t, "POST", "/user/login", map[string]string{
+		"_csrf":     GetCSRF(t, sess, "/user/login"),
+		"user_name": user.Name,
+		"password":  userPassword,
+		"remember":  "true",
+	})
+	sess.MakeRequest(t, req, http.StatusSeeOther)
+
+	// Checks if the database entry exist for the user.
+	ltaCookieValue := GetLTACookieValue(t, sess)
+	lookupKey, validator, found := strings.Cut(ltaCookieValue, ":")
+	assert.True(t, found)
+	rawValidator, err := hex.DecodeString(validator)
+	assert.NoError(t, err)
+	unittest.AssertExistsAndLoadBean(t, &auth.AuthorizationToken{LookupKey: lookupKey, HashedValidator: auth.HashValidator(rawValidator), UID: user.ID})
+
+	// Check if the LTA cookie it provides authentication.
+	// If LTA cookie provides authentication /user/login shouldn't return status 200.
+	session := GetSessionForLTACookie(t, sess.GetCookie(setting.CookieRememberName))
+	req = NewRequest(t, "GET", "/user/login")
+	session.MakeRequest(t, req, http.StatusSeeOther)
+}
+
+// TestLTAPasswordChange checks that LTA doesn't provide authentication when a
+// password change has happened and that the new LTA does provide authentication.
+func TestLTAPasswordChange(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+	sess := loginUserWithPasswordRemember(t, user.Name, userPassword, true)
+	oldRememberCookie := sess.GetCookie(setting.CookieRememberName)
+	assert.NotNil(t, oldRememberCookie)
+
+	// Make a simple password change.
+	req := NewRequestWithValues(t, "POST", "/user/settings/account", map[string]string{
+		"_csrf":        GetCSRF(t, sess, "/user/settings/account"),
+		"old_password": userPassword,
+		"password":     "password2",
+		"retype":       "password2",
+	})
+	sess.MakeRequest(t, req, http.StatusSeeOther)
+	rememberCookie := sess.GetCookie(setting.CookieRememberName)
+	assert.NotNil(t, rememberCookie)
+
+	// Check if the password really changed.
+	assert.NotEqualValues(t, unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1}).Passwd, user.Passwd)
+
+	// /user/settings/account should provide with a new LTA cookie, so check for that.
+	// If LTA cookie provides authentication /user/login shouldn't return status 200.
+	session := GetSessionForLTACookie(t, rememberCookie)
+	req = NewRequest(t, "GET", "/user/login")
+	session.MakeRequest(t, req, http.StatusSeeOther)
+
+	// Check if the old LTA token is invalidated.
+	session = GetSessionForLTACookie(t, oldRememberCookie)
+	req = NewRequest(t, "GET", "/user/login")
+	session.MakeRequest(t, req, http.StatusOK)
+}
+
+// TestLTAExpiry tests that the LTA expiry works.
+func TestLTAExpiry(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+	sess := loginUserWithPasswordRemember(t, user.Name, userPassword, true)
+
+	ltaCookieValie := GetLTACookieValue(t, sess)
+	lookupKey, _, found := strings.Cut(ltaCookieValie, ":")
+	assert.True(t, found)
+
+	// Ensure it's not expired.
+	lta := unittest.AssertExistsAndLoadBean(t, &auth.AuthorizationToken{UID: user.ID, LookupKey: lookupKey})
+	assert.False(t, lta.IsExpired())
+
+	// Manually stub LTA's expiry.
+	_, err := db.GetEngine(db.DefaultContext).ID(lta.ID).Table("forgejo_auth_token").Cols("expiry").Update(&auth.AuthorizationToken{Expiry: timeutil.TimeStampNow()})
+	assert.NoError(t, err)
+
+	// Ensure it's expired.
+	lta = unittest.AssertExistsAndLoadBean(t, &auth.AuthorizationToken{UID: user.ID, LookupKey: lookupKey})
+	assert.True(t, lta.IsExpired())
+
+	// Should return 200 OK, because LTA doesn't provide authorization anymore.
+	session := GetSessionForLTACookie(t, sess.GetCookie(setting.CookieRememberName))
+	req := NewRequest(t, "GET", "/user/login")
+	session.MakeRequest(t, req, http.StatusOK)
+
+	// Ensure it's deleted.
+	unittest.AssertNotExistsBean(t, &auth.AuthorizationToken{UID: user.ID, LookupKey: lookupKey})
+}

tests/integration/integration_test.go

@@ -17,6 +17,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"sync/atomic"
 	"testing"
@@ -302,6 +303,12 @@ func loginUser(t testing.TB, userName string) *TestSession {
 
 func loginUserWithPassword(t testing.TB, userName, password string) *TestSession {
 	t.Helper()
+
+	return loginUserWithPasswordRemember(t, userName, password, false)
+}
+
+func loginUserWithPasswordRemember(t testing.TB, userName, password string, rememberMe bool) *TestSession {
+	t.Helper()
 	req := NewRequest(t, "GET", "/user/login")
 	resp := MakeRequest(t, req, http.StatusOK)
 
@@ -310,6 +317,7 @@ func loginUserWithPassword(t testing.TB, userName, password string) *TestSession
 		"_csrf":     doc.GetCSRF(),
 		"user_name": userName,
 		"password":  password,
+		"remember":  strconv.FormatBool(rememberMe),
 	})
 	resp = MakeRequest(t, req, http.StatusSeeOther)