Class: TaintedLove::Replacer::ReplaceRackRequest

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

Instance Method Summary collapse

Methods inherited from Base

replacers, #should_replace?

Instance Method Details

#replace! ⇒ Object 



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# File 'lib/tainted_love/replacer/replace_rack_query_parser.rb', line 7

def replace!
  block = method(:taint_params)

  TaintedLove.proxy_method('Rack::QueryParser', :parse_nested_query, &block)
  TaintedLove.proxy_method('Rack::QueryParser', :parse_query, &block)
end

#taint_params(return_value, *args) ⇒ Object 



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# File 'lib/tainted_love/replacer/replace_rack_query_parser.rb', line 14

def taint_params(return_value, *args)
  # Assume that if tainted input uses this method, it's to parse a query string
  # It can also be cookies that are being parsed.
  return unless args.first.tainted?

  # figure out what is being parsed from the the method that called it
  name = if Thread.current.backtrace(4).first["`parse_cookies_header'"]
    'cookies'
  else
    'params'
  end

  taint = lambda do |params, path|
    source = name + path.map { |p| "[#{p.inspect}]" }.join

    if params.is_a?(String)
      TaintedLove.tag(params.taint, source: source, value: params)
    end

    if params.is_a?(Array)
      params.each.with_index do |value, index|
        taint.(value, path + [index])
      end
    end

    if params.is_a?(Hash)
      params.each do |key, value|
        taint.(value, path + [key])
      end
    end
  end

  taint.(return_value, [])
end