Class: TaintedLove::Replacer::ReplaceActiveRecord

Inherits:
Base
  • Object
show all
Defined in:
lib/tainted_love/replacer/replace_active_record.rb

Instance Method Summary collapse

Methods inherited from Base

replacers

Instance Method Details

#replace! ⇒ Object 



10
11
12
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
 
# File 'lib/tainted_love/replacer/replace_active_record.rb', line 10

def replace!
  require 'active_record/relation'

  TaintedLove.proxy_method('ActiveRecord::QueryMethods', :where) do |_, *args|
    unless args.empty?
      f = args.first
      if f.is_a?(String) && f.tainted?
        TaintedLove.report(:ReplaceActiveRecord, f, [:sqli], 'Model.where using tainted string')
      end
    end
  end

  TaintedLove.proxy_method('ActiveRecord::QueryMethods', :order) do |_, *args|
    unless args.empty?
      f = args.first
      if f.is_a?(String) && f.tainted?
        TaintedLove.report(:ReplaceActiveRecord, f, [:sqli], 'Model.order using tainted string')
      end
    end
  end

  TaintedLove.proxy_method('ActiveRecord::QueryMethods', :select) do |_, *args|
    unless args.empty?
      f = args.first
      if f.is_a?(String) && f.tainted?
        TaintedLove.report(:ReplaceActiveRecord, f, [:sqli], 'Model.select using tainted string')
      end
    end
  end

  mod = Module.new do
    [:find_by_sql, :count_by_sql].each do |method|
      define_method(method) do |*args|

        # skip if find_by_sql is coming from find_by because the where monkey-patch will catch it
        unless Thread.current.backtrace(3).take(1).first["in `find_by'"]
          if args.first.tainted?
            TaintedLove.report(:ReplaceActiveRecord, args.first, [:sqli], "Model##{method} using tainted string")
          end
        end

        super(*args)
      end
    end

    # Removes taint on string have been sanitized, unless the first argument is tainted
    def sanitize_sql_array(ary)
      return_value = super(ary)

      if ary.first.tainted?
        return_value.taint
      else
        return_value.untaint
      end
    end
  end

  ActiveRecord::Base.extend(mod)
end

#should_replace? ⇒ Boolean

Returns:

  • (Boolean) 


6
7
8
 
# File 'lib/tainted_love/replacer/replace_active_record.rb', line 6

def should_replace?
  Object.const_defined?('ActiveRecord')
end