Change permissions on backup files

Use more restrictive permissions for backup tar files and for the db,
uploads, and repositories directories inside the tar files.

CHANGELOG

@@ -34,6 +34,7 @@ v 7.9.0 (unreleased)
   - Add a service to send updates to an Irker gateway (Romain Coltel)
   - Add brakeman (security scanner for Ruby on Rails)
   - Slack username and channel options
+  - Restrict permissions on backup files
   - Add grouped milestones from all projects to dashboard.
   - Web hook sends pusher email as well as commiter
   - Add Bitbucket omniauth provider.

lib/backup/manager.rb

@@ -11,22 +11,28 @@ module Backup
       s[:tar_version]        = tar_version
       tar_file = "#{s[:backup_created_at].to_i}_gitlab_backup.tar"
 
+      orig_pwd = Dir.pwd
       Dir.chdir(Gitlab.config.backup.path)
 
       File.open("#{Gitlab.config.backup.path}/backup_information.yml", "w+") do |file|
         file << s.to_yaml.gsub(/^---\n/,'')
       end
 
+      FileUtils.chmod_R(0700, %w{db uploads repositories})
+
       # create archive
       $progress.print "Creating backup archive: #{tar_file} ... "
+      orig_umask = File.umask(0077)
       if Kernel.system('tar', '-cf', tar_file, *BACKUP_CONTENTS)
         $progress.puts "done".green
       else
         puts "creating archive #{tar_file} failed".red
         abort 'Backup failed'
       end
+      File.umask(orig_umask)
 
       upload(tar_file)
+      Dir.chdir(orig_pwd)
     end
 
     def upload(tar_file)
@@ -51,13 +57,15 @@ module Backup
 
     def cleanup
       $progress.print "Deleting tmp directories ... "
-      if Kernel.system('rm', '-rf', *BACKUP_CONTENTS)
+      BACKUP_CONTENTS.each do |dir|
+        if FileUtils.rm_rf(File.join(Gitlab.config.backup.path, dir))
           $progress.puts "done".green
         else
-        puts "deleting tmp directory failed".red
+          puts "deleting tmp directory '#{dir}' failed".red
           abort 'Backup failed'
         end
       end
+    end
 
     def remove_old
       # delete backups

spec/tasks/gitlab/backup_rake_spec.rb

@@ -10,17 +10,17 @@ describe 'gitlab:app namespace rake task' do
     Rake::Task.define_task :environment
   end
 
+  def run_rake_task(task_name)
+    Rake::Task[task_name].reenable
+    Rake.application.invoke_task task_name
+  end
+
   describe 'backup_restore' do
     before do
       # avoid writing task output to spec progress
       allow($stdout).to receive :write
     end
 
-    let :run_rake_task do
-      Rake::Task["gitlab:backup:restore"].reenable
-      Rake.application.invoke_task "gitlab:backup:restore"
-    end
-
     context 'gitlab version' do
       before do
         Dir.stub glob: []
@@ -36,7 +36,9 @@ describe 'gitlab:app namespace rake task' do
 
       it 'should fail on mismatch' do
         YAML.stub load_file: {gitlab_version: "not #{gitlab_version}" }
-        expect { run_rake_task }.to raise_error SystemExit
+        expect { run_rake_task('gitlab:backup:restore') }.to(
+          raise_error SystemExit
+        )
       end
 
       it 'should invoke restoration on mach' do
@@ -44,9 +46,56 @@ describe 'gitlab:app namespace rake task' do
         expect(Rake::Task["gitlab:backup:db:restore"]).to receive :invoke
         expect(Rake::Task["gitlab:backup:repo:restore"]).to receive :invoke
         expect(Rake::Task["gitlab:shell:setup"]).to receive :invoke
-        expect { run_rake_task }.to_not raise_error
+        expect { run_rake_task('gitlab:backup:restore') }.to_not raise_error
       end
     end
 
   end # backup_restore task
+
+  describe 'backup_create' do
+    def tars_glob
+      Dir.glob(File.join(Gitlab.config.backup.path, '*_gitlab_backup.tar'))
+    end
+
+    before :all do
+      # Record the existing backup tars so we don't touch them
+      existing_tars = tars_glob
+
+      # Redirect STDOUT and run the rake task
+      orig_stdout = $stdout
+      $stdout = StringIO.new
+      run_rake_task('gitlab:backup:create')
+      $stdout = orig_stdout
+
+      @backup_tar = (tars_glob - existing_tars).first
+    end
+
+    after :all do
+      FileUtils.rm(@backup_tar)
+    end
+
+    it 'should set correct permissions on the tar file' do
+      expect(File.exist?(@backup_tar)).to be_truthy
+      expect(File::Stat.new(@backup_tar).mode.to_s(8)).to eq('100600')
+    end
+
+    it 'should set correct permissions on the tar contents' do
+      tar_contents, exit_status = Gitlab::Popen.popen(
+        %W{tar -tvf #{@backup_tar} db uploads repositories}
+      )
+      expect(exit_status).to eq(0)
+      expect(tar_contents).to match('db/')
+      expect(tar_contents).to match('uploads/')
+      expect(tar_contents).to match('repositories/')
+      expect(tar_contents).not_to match(/^.{4,9}[rwx]/)
+    end
+
+    it 'should delete temp directories' do
+      temp_dirs = Dir.glob(
+        File.join(Gitlab.config.backup.path, '{db,repositories,uploads}')
+      )
+
+      expect(temp_dirs).to be_empty
+    end
+  end # backup_create task
 end # gitlab:app namespace