Revert "[GITEA] rework long-term authentication"

This reverts commit 8d2dab94a6.

modules/context/context_cookie.go

@@ -4,14 +4,16 @@
 package context
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"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/util"
 	"code.gitea.io/gitea/modules/web/middleware"
+
+	"golang.org/x/crypto/pbkdf2"
 )
 
 const CookieNameFlash = "gitea_flash"
@@ -44,13 +46,41 @@ 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
+// GetSuperSecureCookie returns given cookie value from request header with secret string.
+func (ctx *Context) GetSuperSecureCookie(secret, name string) (string, bool) {
+	val := ctx.GetSiteCookie(name)
+	return ctx.CookieDecrypt(secret, val)
+}
+
+// CookieDecrypt returns given value from with secret string.
+func (ctx *Context) CookieDecrypt(secret, val string) (string, bool) {
+	if val == "" {
+		return "", false
+	}
+
+	text, err := hex.DecodeString(val)
+	if err != nil {
+		return "", false
+	}
+
+	key := pbkdf2.Key([]byte(secret), []byte(secret), 1000, 16, sha256.New)
+	text, err = util.AESGCMDecrypt(key, text)
+	return string(text), err == nil
+}
+
+// SetSuperSecureCookie sets given cookie value to response header with secret string.
+func (ctx *Context) SetSuperSecureCookie(secret, name, value string, maxAge int) {
+	text := ctx.CookieEncrypt(secret, value)
+	ctx.SetSiteCookie(name, text, maxAge)
+}
+
+// CookieEncrypt encrypts a given value using the provided secret
+func (ctx *Context) CookieEncrypt(secret, value string) string {
+	key := pbkdf2.Key([]byte(secret), []byte(secret), 1000, 16, sha256.New)
+	text, err := util.AESGCMEncrypt(key, []byte(value))
+	if err != nil {
+		panic("error encrypting cookie: " + err.Error())
+	}
+
+	return hex.EncodeToString(text)
 }