Fix audit event that weren't being created for failed LDAP log-in tries

Signed-off-by: Rémy Coutable <remy@rymai.me>

changelogs/unreleased/211824-fix-failed-ldap-login-audit.yml

+---
+title: Fix audit event that weren't being created for failed LDAP log-in tries
+merge_request: 27608
+author:
+type: fixed

ee/app/controllers/ee/ldap/omniauth_callbacks_controller.rb

@@ -13,6 +13,15 @@ module EE
         super
       end
 
+      override :fail_login
+      def fail_login(user)
+        # This is the same implementation as EE::OmniauthCallbacksController#fail_login but we need to add it here since
+        # we're overriding Ldap::OmniauthCallbacksController#fail_login, not EE::OmniauthCallbacksController#fail_login.
+        log_failed_login(user.username, oauth['provider'])
+
+        super
+      end
+
       private
 
       def show_ldap_sync_flash

ee/spec/controllers/ldap/omniauth_callbacks_controller_spec.rb

@@ -22,7 +22,9 @@ describe Ldap::OmniauthCallbacksController do
   context 'access denied' do
     let(:valid_login?) { false }
 
-    it 'logs a failure event' do
+    # This test used to pass on retry only, masking an actual bug. We want to
+    # make sure it passes on the first try.
+    it 'logs a failure event', retry: 0 do
       stub_licensed_features(extended_audit_events: true)
 
       expect { post provider }.to change(SecurityEvent, :count).by(1)