This gem protects against typical web attacks. Should work for all Rack apps, including Rails.

Use all protections you probably want to use:

# config.ru
require 'rack/protection'
use Rack::Protection
run MyApp

Skip a single protection middleware:

# config.ru
require 'rack/protection'
use Rack::Protection, :except => :path_traversal
run MyApp

Use a single protection middleware:

# config.ru
require 'rack/protection'
use Rack::Protection::AuthenticityToken
run MyApp

Prevented by:

• Rack::Protection::AuthenticityToken (not included by use Rack::Protection)
• Rack::Protection::FormToken (not included by use Rack::Protection)
• Rack::Protection::JsonCsrf
• Rack::Protection::RemoteReferrer (not included by use Rack::Protection)
• Rack::Protection::RemoteToken
• Rack::Protection::HttpOrigin

Prevented by:

• Rack::Protection::EscapedParams (not included by use Rack::Protection)
• Rack::Protection::XSSHeader (Internet Explorer only)

Prevented by:

• Rack::Protection::FrameOptions

Prevented by:

• Rack::Protection::PathTraversal

Prevented by:

• Rack::Protection::SessionHijacking

Prevented by:

• Rack::Protection::IPSpoofing

gem install rack-protection

Instrumentation is enabled by passing in an instrumenter as an option.

use Rack::Protection, instrumenter: ActiveSupport::Notifications

The instrumenter is passed a namespace (String) and environment (Hash). The namespace is 'rack.protection' and the attack type can be obtained from the environment key 'rack.protection.attack'.