Class: Brakeman::CheckEvaluation

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

Overview

This check looks for calls to eval, instance_eval, etc. which include user input.

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

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

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, #initialize, #process_call, #process_cookies, #process_default, #process_if, #process_params

Methods included from Util

#array?, #call?, #camelize, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #node_type?, #number?, #params?, #pluralize, #regexp?, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #symbol?, #table_to_csv, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#class_name, #process_all, #process_module

Methods inherited from SexpProcessor

#error_handler, #in_context, #initialize, #process, #process_dummy, #scope

Constructor Details

This class inherits a constructor from Brakeman::BaseCheck

Instance Method Details

#process_result(result) ⇒ Object

Warns if eval includes user input



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# File 'lib/brakeman/checks/check_evaluation.rb', line 22

def process_result result
  if input = include_user_input?(result[:call][-1])
    warn :result => result,
      :warning_type => "Dangerous Eval",
      :message => "User input in eval",
      :code => result[:call],
      :user_input => input.match,
      :confidence => CONFIDENCE[:high]
  end
end

#run_check ⇒ Object

Process calls



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# File 'lib/brakeman/checks/check_evaluation.rb', line 11

def run_check
  Brakeman.debug "Finding eval-like calls"
  calls = tracker.find_call :method => [:eval, :instance_eval, :class_eval, :module_eval]

  Brakeman.debug "Processing eval-like calls"
  calls.each do |call|
    process_result call
  end
end