Class: Brakeman::CheckWithoutProtection

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

Overview

Check for bypassing mass assignment protection with without_protection => true

Only for Rails 3.1

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

#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

#all_literals?(call) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/checks/check_without_protection.rb', line 66

def all_literals? call
  call.each_arg do |arg|
    if hash? arg
      hash_iterate arg do |k, v|
        unless node_type? k, :str, :lit, :false, :true and node_type? v, :str, :lit, :false, :true
          return false
        end
      end
    else
      return false
    end
  end

  true
end

#process_result(res) ⇒ Object

All results should be Model.new(…) or Model.attributes=() calls



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# File 'lib/brakeman/checks/check_without_protection.rb', line 34

def process_result res
  call = res[:call]
  last_arg = call.last_arg

  if hash? last_arg and not call.original_line and not duplicate? res

    if value = hash_access(last_arg, :without_protection)
      if true? value
        add_result res

        if input = include_user_input?(call.arglist)
          confidence = :high
        elsif all_literals? call
          return
        else
          confidence = :medium
        end

        warn :result => res, 
          :warning_type => "Mass Assignment", 
          :warning_code => :mass_assign_without_protection,
          :message => "Unprotected mass assignment",
          :code => call, 
          :user_input => input,
          :confidence => confidence,
          :cwe_id => [915]

      end
    end
  end
end

#run_check ⇒ Object 



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

def run_check
  if version_between? "0.0.0", "3.0.99"
    return
  end

  return if active_record_models.empty?

  Brakeman.debug "Finding all mass assignments"
  calls = tracker.find_call :targets => active_record_models.keys, :methods => [:new,
    :attributes=, 
    :update_attributes, 
    :update_attributes!,
    :create,
    :create!]

  Brakeman.debug "Processing all mass assignments"
  calls.each do |result|
    process_result result
  end
end