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rails--rails/actionpack/lib/action_controller/metal/request_forgery_protection.rb

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require 'active_support/core_ext/class/attribute'
module ActionController #:nodoc:
class InvalidAuthenticityToken < ActionControllerError #:nodoc:
end
# Controller actions are protected from Cross-Site Request Forgery (CSRF) attacks
# by including a token in the rendered html for your application. This token is
# stored as a random string in the session, to which an attacker does not have
# access. When a request reaches your application, \Rails then verifies the received
# token with the token in the session. Only HTML and javascript requests are checked,
# so this will not protect your XML API (presumably you'll have a different
# authentication scheme there anyway). Also, GET requests are not protected as these
# should be idempotent.
#
# CSRF protection is turned on with the <tt>protect_from_forgery</tt> method,
# which will check the token and raise an ActionController::InvalidAuthenticityToken
# if it doesn't match what was expected. A call to this method is generated for new
# \Rails applications by default. You can customize the error message by editing
# public/422.html.
#
# The token parameter is named <tt>authenticity_token</tt> by default. The name and
# value of this token must be added to every layout that renders forms by including
# <tt>csrf_meta_tags</tt> in the html +head+.
#
# Learn more about CSRF attacks and securing your application in the
# {Ruby on Rails Security Guide}[http://guides.rubyonrails.org/security.html].
module RequestForgeryProtection
extend ActiveSupport::Concern
include AbstractController::Helpers
include AbstractController::Callbacks
included do
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# Sets the token parameter name for RequestForgery. Calling +protect_from_forgery+
# sets it to <tt>:authenticity_token</tt> by default.
config_accessor :request_forgery_protection_token
self.request_forgery_protection_token ||= :authenticity_token
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# Controls whether request forgery protection is turned on or not. Turned off by default only in test mode.
config_accessor :allow_forgery_protection
self.allow_forgery_protection = true if allow_forgery_protection.nil?
helper_method :form_authenticity_token
helper_method :protect_against_forgery?
end
module ClassMethods
# Turn on request forgery protection. Bear in mind that only non-GET, HTML/JavaScript requests are checked.
#
# Example:
#
# class FooController < ApplicationController
# protect_from_forgery :except => :index
#
# You can disable csrf protection on controller-by-controller basis:
#
# skip_before_filter :verify_authenticity_token
#
# It can also be disabled for specific controller actions:
#
# skip_before_filter :verify_authenticity_token, :except => [:create]
#
# Valid Options:
#
Merge docrails: commit e6afd8b2736364322b673bbdcca3e9b38b6d3da0 Author: Xavier Noria <fxn@hashref.com> Date: Thu May 8 23:49:36 2008 +0200 Overall documentation improvement and markup corrections. Zillion changes. commit 2fead68b3192332eee27945ed95a94a64ca73f70 Author: Austin Putman <austin@emmanuel.local> Date: Wed May 7 19:35:46 2008 -0700 Documented class methods on ActionController::Routing. These are dangerous, and mostly used for testing. commit f5b84182dbc39bea79c8ee319c688d00fa99f9d1 Author: Teflon Ted <github@rudiment.net> Date: Wed May 7 16:08:49 2008 -0400 Added explanation about errant inflections not being patched in the future in order to avoid breaking legacy applications. commit 370f4f51722cec49ace17093d29e9ce9e8f15cfb Author: Sunny Ripert <negatif@gmail.com> Date: Wed May 7 14:00:59 2008 +0200 Applied list conventions in AR::Base commit 5bd18429f09d44e75191bec42a6db04bd33f3030 Author: Sunny Ripert <negatif@gmail.com> Date: Wed May 7 13:53:35 2008 +0200 Renamed Options list to Attributes list whenever they weren't option hashes in AR::Base commit d912bd5672316454457ae83f6e9dda5197beeb6f Author: Yaroslav Markin <yaroslav@markin.net> Date: Wed May 7 13:50:28 2008 +0400 Add a filter_parameter_logging usage hint to generated ApplicationController. This may help to remind the developer to filter sensitive information from application logs. Closes #11578 commit b243de0db3c2605121e055079854af5090d06374 Author: Jack Danger Canty <git@6brand.com> Date: Tue May 6 23:39:47 2008 -0700 doc: disambiguating an example ActiveRecord class commit f81d771f0657ae8375b84a77a059812cce5d6fd9 Author: Jack Danger Canty <git@6brand.com> Date: Tue May 6 23:35:05 2008 -0700 doc: ActiveRecord::Reflection::AssociationReflection#through_reflection Added documentation demonstrating the use of #through_reflection for finding intervening reflection objects for HasManyThrough and HasOneThrough. commit ae6b46f00b5b8b2939c6b37ce3329c83de7e71db Author: Cheah Chu Yeow <chuyeow@gmail.com> Date: Wed May 7 13:47:41 2008 +0800 Document AttributeAssignmentError and MultiparameterAssignmentErrors. commit 8f463550b597db2156b67733f31aed13487fbc3a Author: John Barnette <jbarnette@gmail.com> Date: Tue May 6 22:46:44 2008 -0700 Killing/fixing a bunch of outdated language in the AR README. commit aca44bcd92ef783abdf484b58abdde6786db0f89 Author: Cheah Chu Yeow <chuyeow@gmail.com> Date: Wed May 7 13:34:52 2008 +0800 Make a note about ActiveResource::Timeouterror being raised when ARes calls timeout. commit 284a930a93fbee16e25d06392779dbf2f03e9e12 Author: Jonathan Dance <jd@wuputah.com> Date: Tue May 6 14:58:26 2008 -0400 improvements to the page caching docs commit 9482da621390c874da7c921c8bd6230caae7035a Author: Sunny Ripert <negatif@gmail.com> Date: Mon May 5 18:13:40 2008 +0200 validates_numericality_of() "integer" option really is "only_integer" commit e9afd6790a8f530528f6597a7f59bb283be754f6 Author: Sunny Ripert <negatif@gmail.com> Date: Mon May 5 12:11:59 2008 +0200 Harmonized hash notation in AR::Base commit 67ebf14a91ffd970b582be4ff2991d691a9cf3e1 Author: Sunny Ripert <negatif@gmail.com> Date: Mon May 5 12:06:19 2008 +0200 Turned options into rdoc-lists in AR::Base commit 0ec7c0a41d889d4e5382b9dff72f1aaba89bf297 Author: Marshall Huss <mwhuss@Macbook.local> Date: Sun May 4 23:21:33 2008 -0400 Added information of how to set element_name in the case the user has a name confliction with an existing model Signed-off-by: Pratik Naik <pratiknaik@gmail.com>
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# * <tt>:only/:except</tt> - Passed to the <tt>before_filter</tt> call. Set which actions are verified.
def protect_from_forgery(options = {})
self.request_forgery_protection_token ||= :authenticity_token
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before_filter :verify_authenticity_token, options
end
end
protected
# The actual before_filter that is used. Modify this to change how you handle unverified requests.
def verify_authenticity_token
verified_request? || handle_unverified_request
end
def handle_unverified_request
reset_session
end
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# Returns true or false if a request is verified. Checks:
#
# * is it a GET request? Gets should be safe and idempotent
# * Does the form_authenticity_token match the given token value from the params?
# * Does the X-CSRF-Token header match the form_authenticity_token
def verified_request?
!protect_against_forgery? || request.get? ||
form_authenticity_token == params[request_forgery_protection_token] ||
form_authenticity_token == request.headers['X-CSRF-Token']
end
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# Sets the token value for the current session.
def form_authenticity_token
session[:_csrf_token] ||= ActiveSupport::SecureRandom.base64(32)
end
# The form's authenticity parameter. Override to provide your own.
def form_authenticity_param
params[request_forgery_protection_token]
end
def protect_against_forgery?
allow_forgery_protection
end
end
end