Class: Brakeman::CheckModelAttributes

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

Overview

Check if mass assignment is used with models which inherit from ActiveRecord::Base.

If tracker.options is true (default), all models which do not use attr_accessible will be reported in a single warning

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, #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

#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

#check_for_attr_protected_bypass ⇒ Object 



93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
 
# File 'lib/brakeman/checks/check_model_attributes.rb', line 93

def check_for_attr_protected_bypass
  upgrade_version = case
                    when version_between?("2.0.0", "2.3.16")
                      "2.3.17"
                    when version_between?("3.0.0", "3.0.99")
                      "3.2.11"
                    when version_between?("3.1.0", "3.1.10")
                      "3.1.11"
                    when version_between?("3.2.0", "3.2.11")
                      "3.2.12"
                    else
                      nil
                    end

  if upgrade_version
    message = "attr_protected is bypassable in #{rails_version}, use attr_accessible or upgrade to #{upgrade_version}"
    confidence = CONFIDENCE[:high]
    link = "https://groups.google.com/d/topic/rubyonrails-security/AFBKNY7VSH8/discussion"
  else
    message = "attr_accessible is recommended over attr_protected"
    confidence = CONFIDENCE[:med]
    link = nil
  end

  return message, confidence, link
end

#check_models ⇒ Object 



85
86
87
88
89
90
91
 
# File 'lib/brakeman/checks/check_model_attributes.rb', line 85

def check_models
  tracker.models.each do |name, model|
    if model.unprotected_model?
      yield name, model
    end
  end
end

#run_check ⇒ Object 



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/brakeman/checks/check_model_attributes.rb', line 13

def run_check
  return if mass_assign_disabled?

  #Roll warnings into one warning for all models
  if tracker.options[:collapse_mass_assignment]
    no_accessible_names = []
    protected_names = []

    check_models do |name, model|
      if model.attr_protected.nil?
        no_accessible_names << name.to_s
      elsif not tracker.options[:ignore_attr_protected]
        protected_names << name.to_s
      end
    end

    unless no_accessible_names.empty?
      warn :model => no_accessible_names.sort.join(", "),
        :warning_type => "Attribute Restriction",
        :warning_code => :no_attr_accessible,
        :message => "Mass assignment is not restricted using attr_accessible",
        :confidence => CONFIDENCE[:high]
    end

    unless protected_names.empty?
      message, confidence, link = check_for_attr_protected_bypass

      if link
        warning_code = :CVE_2013_0276
      else
        warning_code = :attr_protected_used
      end

      warn :model => protected_names.sort.join(", "),
        :warning_type => "Attribute Restriction",
        :warning_code => warning_code,
        :message => message,
        :confidence => confidence,
        :link => link
    end
  else #Output one warning per model

    check_models do |name, model|
      if model.attr_protected.nil?
        warn :model => name,
          :file => model.file,
          :line => model.top_line,
          :warning_type => "Attribute Restriction",
          :warning_code => :no_attr_accessible,
          :message => "Mass assignment is not restricted using attr_accessible",
          :confidence => CONFIDENCE[:high]
      elsif not tracker.options[:ignore_attr_protected]
        message, confidence, link = check_for_attr_protected_bypass

        if link
          warning_code = :CVE_2013_0276
        else
          warning_code = :attr_protected_used
        end

        warn :model => name,
          :file => model.file,
          :line => model.attr_protected.first.line,
          :warning_type => "Attribute Restriction",
          :warning_code => warning_code,
          :message => message,
          :confidence => confidence
      end
    end
  end
end