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 blacklist approach (no actions are checked EXCEPT the ones listed) versus a whitelist approach (ONLY the actions listed will skip the check)

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_if, #process_params, #process_string_interp

Methods included from Util

#array?, #block?, #call?, #camelize, #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, #regexp?, #relative_path, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #symbol?, #table_to_csv, #template_path_to_name, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#class_name, #process_all, #process_all!, #process_call_args, #process_class, #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_skip_filter(filter, controller) ⇒ Object


25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
# File 'lib/brakeman/checks/check_skip_before_filter.rb', line 25

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 => "Use whitelist (:only => [..]) when skipping CSRF check",
      :code => filter,
      :confidence => CONFIDENCE[:med],
      :file => controller[:files].first

  when :login_required, :authenticate_user!, :require_user
    warn :controller => controller[:name],
      :warning_code => :auth_blacklist,
      :warning_type => "Authentication",
      :message => "Use whitelist (:only => [..]) when skipping authentication",
      :code => filter,
      :confidence => CONFIDENCE[:med],
      :link => "authentication_whitelist",
      :file => controller[:files].first
  end
end

#run_checkObject


15
16
17
18
19
20
21
22
23
# File 'lib/brakeman/checks/check_skip_before_filter.rb', line 15

def run_check
  tracker.controllers.each do |name, controller|
    filter_skips = controller[:options][:skip_filters]

    filter_skips.each do |filter|
      process_skip_filter filter, controller
    end
  end
end

#skip_except_value(filter) ⇒ Object


48
49
50
51
52
53
54
55
56
57
58
59
60
61
# 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