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Contents
require 'brakeman/checks/base_check'
#Checks if user supplied data is passed to send
class Brakeman::CheckSend < Brakeman::BaseCheck
Brakeman::Checks.add self
@description = "Check for unsafe use of Object#send"
def run_check
@send_methods = [:send, :try, :__send__, :public_send]
Brakeman.debug("Finding instances of #send")
calls = tracker.find_call :methods => @send_methods, :nested => true
calls.each do |call|
process_result call
end
end
def process_result result
return unless original? result
send_call = get_send result[:call]
process_call_args send_call
process send_call.target
if input = has_immediate_user_input?(send_call.first_arg)
warn :result => result,
:warning_type => "Dangerous Send",
:warning_code => :dangerous_send,
:message => "User controlled method execution",
:code => result[:call],
:user_input => input,
:confidence => :high
end
end
# Recursively check call chain for send call
def get_send exp
if call? exp
if @send_methods.include? exp.method
return exp
else
get_send exp.target
end
end
end
end
Version data entries
28 entries across 28 versions & 3 rubygems