Class: Brakeman::CheckSkipBeforeFilter

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

Overview

At the moment, this looks for

skip_before_filter :verify_authenticity_token, :except => [...]

which is essentially a skip-by-default approach (no actions are checked EXCEPT the ones listed) versus a enforce-by-default approach (ONLY the actions listed will skip the check)

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

Util::ALL_COOKIES, Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::DIR_CONST, Util::LITERALS, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_COOKIES, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::REQUEST_REQUEST_PARAMETERS, Util::SAFE_LITERAL, Util::SESSION, Util::SESSION_SEXP, Util::SIMPLE_LITERALS

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_array, #process_call, #process_cookies, #process_default, #process_dstr, #process_if, #process_params

Methods included from Messages

#msg, #msg_code, #msg_cve, #msg_file, #msg_input, #msg_lit, #msg_plain, #msg_version

Methods included from Util

#all_literals?, #array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #cookies?, #dir_glob?, #false?, #hash?, #hash_access, #hash_insert, #hash_iterate, #hash_values, #integer?, #kwsplat?, #literal?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #recurse_check?, #regexp?, #remove_kwsplat, #request_headers?, #request_value?, #result?, #safe_literal, #safe_literal?, #safe_literal_target?, #set_env_defaults, #sexp?, #simple_literal?, #string?, #string_interp?, #symbol?, #template_path_to_name, #true?, #underscore

Methods included from ProcessorHelper

#current_file, #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

#process_skip_filter(filter, controller) ⇒ Object 



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# File 'lib/brakeman/checks/check_skip_before_filter.rb', line 23

def process_skip_filter filter, controller
  case skip_except_value filter
  when :verify_authenticity_token
    warn :class => controller.name, #ugh this should be a controller warning, too
      :warning_type => "Cross-Site Request Forgery",
      :warning_code => :csrf_blacklist,
      :message => msg("List specific actions (", msg_code(":only => [..]"), ") when skipping CSRF check"),
      :code => filter,
      :confidence => :medium,
      :file => controller.file,
      :cwe_id => [352]

  when :login_required, :authenticate_user!, :require_user
    warn :controller => controller.name,
      :warning_code => :auth_blacklist,
      :warning_type => "Authentication",
      :message => msg("List specific actions (", msg_code(":only => [..]"), ") when skipping authentication"),
      :code => filter,
      :confidence => :medium,
      :link_path => "authentication_whitelist",
      :file => controller.file,
      :cwe_id => [287]
  end
end

#run_check ⇒ Object 



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# File 'lib/brakeman/checks/check_skip_before_filter.rb', line 15

def run_check
  tracker.controllers.each do |_name, controller|
    controller.skip_filters.each do |filter|
      process_skip_filter filter, controller
    end
  end
end

#skip_except_value(filter) ⇒ Object 



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# File 'lib/brakeman/checks/check_skip_before_filter.rb', line 48

def skip_except_value filter
  return false unless call? filter

  first_arg = filter.first_arg
  last_arg = filter.last_arg

  if symbol? first_arg and hash? last_arg
    if hash_access(last_arg, :except)
      return first_arg.value
    end
  end

  false
end