Class: Brakeman::CheckForgerySetting

Inherits:
BaseCheck show all
Defined in:
lib/brakeman/checks/check_forgery_setting.rb

Overview

Checks that protect_from_forgery is set in the ApplicationController.

Also warns for CSRF weakness in certain versions of Rails: groups.google.com/group/rubyonrails-security/browse_thread/thread/2d95a3cc23e03665

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION, Util::SESSION_SEXP

Constants inherited from SexpProcessor

SexpProcessor::VERSION

Instance Attribute Summary

Attributes inherited from BaseCheck

#tracker, #warnings

Attributes inherited from SexpProcessor

#context, #env, #expected

Instance Method Summary collapse

Methods inherited from BaseCheck

#add_result, inherited, #initialize, #process_call, #process_cookies, #process_default, #process_dstr, #process_if, #process_params

Methods included from Util

#array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #github_url, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #regexp?, #relative_path, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #string_interp?, #symbol?, #table_to_csv, #template_path_to_name, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#current_file_name, #process_all, #process_all!, #process_call_args, #process_call_defn?, #process_class, #process_module

Methods inherited from SexpProcessor

#in_context, #initialize, #process, processors, #scope

Constructor Details

This class inherits a constructor from Brakeman::BaseCheck

Instance Method Details

#csrf_warning(opts) ⇒ Object 



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# File 'lib/brakeman/checks/check_forgery_setting.rb', line 49

def csrf_warning opts
  opts = {
    :controller => :ApplicationController,
    :warning_type => "Cross-Site Request Forgery",
    :confidence => CONFIDENCE[:high],
    :file => tracker.controllers[:ApplicationController].file
  }.merge opts

  warn opts
end

#cve_2011_0447(new_version) ⇒ Object 



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# File 'lib/brakeman/checks/check_forgery_setting.rb', line 60

def cve_2011_0447 new_version
  csrf_warning :warning_code => :CVE_2011_0447,
    :message => "CSRF protection is flawed in unpatched versions of Rails #{rails_version} (CVE-2011-0447). Upgrade to #{new_version} or apply patches as needed",
    :gem_info => gemfile_or_environment,
    :file => nil,
    :link_path => "https://groups.google.com/d/topic/rubyonrails-security/LZWjzCPgNmU/discussion"
end

#run_check ⇒ Object 



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# File 'lib/brakeman/checks/check_forgery_setting.rb', line 12

def run_check
  app_controller = tracker.controllers[:ApplicationController]
  return unless app_controller and app_controller.ancestor? :"ActionController::Base"

  if tracker.config.allow_forgery_protection?
    csrf_warning :warning_code => :csrf_protection_disabled,
      :message => "Forgery protection is disabled"

  elsif app_controller and not app_controller.protect_from_forgery?
    csrf_warning :warning_code => :csrf_protection_missing,
      :message => "'protect_from_forgery' should be called in ApplicationController",
      :line => app_controller.top_line

  elsif version_between? "2.1.0", "2.3.10"
    cve_2011_0447 "2.3.11"

  elsif version_between? "3.0.0", "3.0.3"
    cve_2011_0447 "3.0.4"

  elsif version_between? "4.0.0", "100.0.0" and forgery_opts = app_controller.options[:protect_from_forgery]
    unless forgery_opts.is_a?(Array) and sexp?(forgery_opts.first) and
        access_arg = hash_access(forgery_opts.first.first_arg, :with) and symbol? access_arg and
        access_arg.value == :exception

      args = {
        :warning_code => :csrf_not_protected_by_raising_exception,
        :message => "protect_from_forgery should be configured with 'with: :exception'",
        :confidence => CONFIDENCE[:med]
      }

      args.merge!(:code => forgery_opts.first) if forgery_opts.is_a?(Array)

      csrf_warning args
    end
  end
end