Merge branch 'issue_17302' into 'master'

CHANGELOG

@@ -21,6 +21,7 @@ v 8.8.0 (unreleased)
   - Bump mail_room to 0.7.0 to fix stuck IDLE connections
   - Remove future dates from contribution calendar graph.
   - Support e-mail notifications for comments on project snippets
+  - Fix API leak of notes of unauthorized issues, snippets and merge requests
   - Use ActionDispatch Remote IP for Akismet checking
   - Fix error when visiting commit builds page before build was updated
   - Add 'l' shortcut to open Label dropdown on issuables and 'i' to create new issue on a project

lib/api/notes.rb

@@ -19,8 +19,9 @@ module API
         #   GET /projects/:id/issues/:noteable_id/notes
         #   GET /projects/:id/snippets/:noteable_id/notes
         get ":id/#{noteables_str}/:#{noteable_id_str}/notes" do
-          @noteable = user_project.send(:"#{noteables_str}").find(params[:"#{noteable_id_str}"])
+          @noteable = user_project.send(noteables_str.to_sym).find(params[noteable_id_str.to_sym])
 
+          if can?(current_user, noteable_read_ability_name(@noteable), @noteable)
             # We exclude notes that are cross-references and that cannot be viewed
             # by the current user. By doing this exclusion at this level and not
             # at the DB query level (which we cannot in that case), the current
@@ -33,6 +34,9 @@ module API
               paginate(@noteable.notes).
               reject { |n| n.cross_reference_not_visible_for?(current_user) }
             present notes, with: Entities::Note
+          else
+            not_found!("Notes")
+          end
         end
 
         # Get a single +noteable+ note
@@ -45,13 +49,14 @@ module API
         #   GET /projects/:id/issues/:noteable_id/notes/:note_id
         #   GET /projects/:id/snippets/:noteable_id/notes/:note_id
         get ":id/#{noteables_str}/:#{noteable_id_str}/notes/:note_id" do
-          @noteable = user_project.send(:"#{noteables_str}").find(params[:"#{noteable_id_str}"])
+          @noteable = user_project.send(noteables_str.to_sym).find(params[noteable_id_str.to_sym])
           @note = @noteable.notes.find(params[:note_id])
+          can_read_note = can?(current_user, noteable_read_ability_name(@noteable), @noteable) && !@note.cross_reference_not_visible_for?(current_user)
 
-          if @note.cross_reference_not_visible_for?(current_user)
-            not_found!("Note")
-          else
+          if can_read_note
             present @note, with: Entities::Note
+          else
+            not_found!("Note")
           end
         end
 
@@ -136,5 +141,11 @@ module API
         end
       end
     end
+
+    helpers do
+      def noteable_read_ability_name(noteable)
+        "read_#{noteable.class.to_s.underscore.downcase}".to_sym
+      end
+    end
   end
 end