Merge branch 'import-symlinks-9-3' into 'security-9-3'

Fix file disclosure via hidden symlinks using the project import (9.3)

See merge request !2164

changelogs/unreleased/fix-import-symbolink-links.yml

+---
+title: Remove hidden symlinks from project import files
+merge_request:
+author:

lib/gitlab/import_export/file_importer.rb

@@ -47,12 +47,16 @@ module Gitlab
       end
 
       def remove_symlinks!
-        Dir["#{@shared.export_path}/**/*"].each do |path|
+        extracted_files.each do |path|
           FileUtils.rm(path) if File.lstat(path).symlink?
         end
 
         true
       end
+
+      def extracted_files
+        Dir.glob("#{@shared.export_path}/**/*", File::FNM_DOTMATCH).reject { |f| f =~ /.*\/\.{1,2}$/ }
+      end
     end
   end
 end

spec/lib/gitlab/import_export/file_importer_spec.rb

@@ -5,6 +5,7 @@ describe Gitlab::ImportExport::FileImporter do
   let(:export_path) { "#{Dir.tmpdir}/file_importer_spec" }
   let(:valid_file) { "#{shared.export_path}/valid.json" }
   let(:symlink_file) { "#{shared.export_path}/invalid.json" }
+  let(:hidden_symlink_file) { "#{shared.export_path}/.hidden" }
   let(:subfolder_symlink_file) { "#{shared.export_path}/subfolder/invalid.json" }
 
   before do
@@ -25,6 +26,10 @@ describe Gitlab::ImportExport::FileImporter do
     expect(File.exist?(symlink_file)).to be false
   end
 
+  it 'removes hidden symlinks in root folder' do
+    expect(File.exist?(hidden_symlink_file)).to be false
+  end
+
   it 'removes symlinks in subfolders' do
     expect(File.exist?(subfolder_symlink_file)).to be false
   end