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Security-focused static analysis for Elixir & the Phoenix framework
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lib/sobelow/ci/system.ex
defmodule Sobelow.CI.System do
alias Sobelow.Utils
use Sobelow.Finding
def run(fun, filename) do
severity = if String.ends_with?(filename, "_controller.ex"), do: false, else: :low
{vars, params, {fun_name, [{_, line_no}]}} = parse_system_def(fun, :cmd)
Enum.each vars, fn var ->
if Enum.member?(params, var) || var === "conn.params" do
print_sys_finding(line_no, filename, fun_name, fun, var, severity || :high)
else
print_sys_finding(line_no, filename, fun_name, fun, var, severity || :medium)
end
end
end
def parse_system_def(fun, type) do
{params, {fun_name, line_no}} = Utils.get_fun_declaration(fun)
pipefuns = Utils.get_pipe_funs(fun)
|> Enum.map(fn {_, _, opts} -> Enum.at(opts, 1) end)
|> Enum.flat_map(&Utils.get_aliased_funs_of_type(&1, type, [:System]))
pipesys = Enum.flat_map(pipefuns, &Utils.get_pipe_val(fun, &1))
|> List.flatten
sys = Utils.get_aliased_funs_of_type(fun, type, [:System]) -- pipesys
|> Enum.map(&Utils.extract_opts(&1, 0))
|> List.flatten
{sys ++ pipesys, params, {fun_name, line_no}}
end
def print_sys_finding(line_no, filename, fun_name, fun, var, severity) do
Utils.print_finding_metadata(line_no, filename, fun,
fun_name, var, severity,
"Command Injection in `System.cmd`", :cmd, [:System])
end
def get_details() do
Sobelow.CI.details()
end
end