Disable board policies when issues are disabled

Board list policies are also included

app/policies/project_policy.rb

@@ -299,6 +299,8 @@ class ProjectPolicy < BasePolicy
 
   rule { issues_disabled }.policy do
     prevent(*create_read_update_admin_destroy(:issue))
+    prevent(*create_read_update_admin_destroy(:board))
+    prevent(*create_read_update_admin_destroy(:list))
   end
 
   rule { merge_requests_disabled | repository_disabled }.policy do

changelogs/unreleased/security-2798-fix-boards-policy.yml

+---
+title: Disable issue boards API when issues are disabled
+merge_request:
+author:
+type: security

spec/policies/project_policy_spec.rb

@@ -130,25 +130,29 @@ describe ProjectPolicy do
     subject { described_class.new(owner, project) }
 
     context 'when the feature is disabled' do
-      it 'does not include the issues permissions' do
+      before do
         project.issues_enabled = false
         project.save!
+      end
 
+      it 'does not include the issues permissions' do
         expect_disallowed :read_issue, :read_issue_iid, :create_issue, :update_issue, :admin_issue
       end
+
+      it 'disables boards and lists permissions' do
+        expect_disallowed :read_board, :create_board, :update_board, :admin_board
+        expect_disallowed :read_list, :create_list, :update_list, :admin_list
       end
 
-    context 'when the feature is disabled and external tracker configured' do
+      context 'when external tracker configured' do
         it 'does not include the issues permissions' do
           create(:jira_service, project: project)
 
-        project.issues_enabled = false
-        project.save!
-
           expect_disallowed :read_issue, :read_issue_iid, :create_issue, :update_issue, :admin_issue
         end
       end
     end
+  end
 
   context 'merge requests feature' do
     subject { described_class.new(owner, project) }