feat: add ldap component (#3568)

* add ldap component

* fix: fix russian comments, tls cert verify default true

* feat: remove replaces go mod for local dev

web/service/user.go

@@ -7,7 +7,7 @@ import (
 	"github.com/mhsanaei/3x-ui/v2/database/model"
 	"github.com/mhsanaei/3x-ui/v2/logger"
 	"github.com/mhsanaei/3x-ui/v2/util/crypto"
-
+    ldaputil "github.com/mhsanaei/3x-ui/v2/util/ldap"
 	"github.com/xlzd/gotp"
 	"gorm.io/gorm"
 )
@@ -49,9 +49,38 @@ func (s *UserService) CheckUser(username string, password string, twoFactorCode
 		return nil
 	}
 
-	if !crypto.CheckPasswordHash(user.Password, password) {
-		return nil
-	}
+    // If LDAP enabled and local password check fails, attempt LDAP auth
+    if !crypto.CheckPasswordHash(user.Password, password) {
+        ldapEnabled, _ := s.settingService.GetLdapEnable()
+        if !ldapEnabled {
+            return nil
+        }
+
+        host, _ := s.settingService.GetLdapHost()
+        port, _ := s.settingService.GetLdapPort()
+        useTLS, _ := s.settingService.GetLdapUseTLS()
+        bindDN, _ := s.settingService.GetLdapBindDN()
+        ldapPass, _ := s.settingService.GetLdapPassword()
+        baseDN, _ := s.settingService.GetLdapBaseDN()
+        userFilter, _ := s.settingService.GetLdapUserFilter()
+        userAttr, _ := s.settingService.GetLdapUserAttr()
+
+        cfg := ldaputil.Config{
+            Host: host,
+            Port: port,
+            UseTLS: useTLS,
+            BindDN: bindDN,
+            Password: ldapPass,
+            BaseDN: baseDN,
+            UserFilter: userFilter,
+            UserAttr: userAttr,
+        }
+        ok, err := ldaputil.AuthenticateUser(cfg, username, password)
+        if err != nil || !ok {
+            return nil
+        }
+        // On successful LDAP auth, continue 2FA checks below
+    }
 
 	twoFactorEnable, err := s.settingService.GetTwoFactorEnable()
 	if err != nil {