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Security-focused static analysis for Elixir & the Phoenix framework
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lib/sobelow/traversal/send_file.ex
defmodule Sobelow.Traversal.SendFile do
alias Sobelow.{Parse, Print}
use Sobelow.Finding
@finding_type "Traversal.SendFile: Directory Traversal in `send_file`"
def run(fun, meta_file) do
severity = if meta_file.is_controller?, do: false, else: :low
{findings, params, {fun_name, [{_, line_no}]}} = parse_def(fun)
Enum.each(findings, fn {finding, var} ->
Print.add_finding(
line_no,
meta_file.filename,
fun,
fun_name,
var,
Print.get_sev(params, var, severity),
finding,
@finding_type
)
end)
end
## send_file(conn, status, file, offset \\ 0, length \\ :all)
defp parse_def(fun) do
{files, params, {fun_name, line_no}} = Parse.get_fun_vars_and_meta(fun, 2, :send_file)
{aliased_files, _, _} = Parse.get_fun_vars_and_meta(fun, 2, :send_file, :Conn)
{files ++ aliased_files, params, {fun_name, line_no}}
end
def details() do
Sobelow.Traversal.details()
end
end