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Security-focused static analysis for Elixir & the Phoenix framework
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lib/sobelow/traversal/file_module.ex
defmodule Sobelow.Traversal.FileModule do
alias Sobelow.Utils
use Sobelow.Finding
@file_funcs [:read,
:read!,
:write,
:write!,
:rm,
:rm!,
:rm_rf]
@double_file_funcs [:cp,
:cp!,
:cp_r,
:cp_r!,
:ln,
:ln!,
:ln_s,
:ln_s!]
def run(fun, filename) do
severity = if String.ends_with?(filename, "_controller.ex"), do: false, else: :low
Enum.each @file_funcs ++ @double_file_funcs, fn(file_func) ->
{vars, params, {fun_name, [{_, line_no}]}} = parse_def(fun, file_func)
Enum.each vars, fn var ->
add_finding(line_no, filename, fun_name,
fun, var, file_func,
Utils.get_sev(params, var, severity))
end
end
Enum.each @double_file_funcs, fn(file_func) ->
{vars, params, {fun_name, [{_, line_no}]}} = parse_second_def(fun, file_func)
Enum.each vars, fn var ->
add_finding(line_no, filename, fun_name,
fun, var, file_func,
Utils.get_sev(params, var, severity))
end
end
end
def parse_def(fun, type) do
Utils.get_fun_vars_and_meta(fun, 0, type, [:File])
end
def parse_second_def(fun, type) do
Utils.get_fun_vars_and_meta(fun, 1, type, [:File])
end
def add_finding(line_no, filename, fun_name, fun, var, type, severity) do
title = "Directory Traversal in `File.#{type}`"
Utils.add_finding(line_no, filename, fun,
fun_name, var, severity,
title, type, [:File])
end
def get_details() do
Sobelow.Traversal.details()
end
end