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Security-focused static analysis for Elixir & the Phoenix framework
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lib/sobelow/xss/send_resp.ex
defmodule Sobelow.XSS.SendResp do
alias Sobelow.Utils
use Sobelow.Finding
def run(fun, meta_file) do
{ref_vars, is_html, params, {fun_name, [{_, line_no}]}} = parse_def(fun)
filename = meta_file.filename
Enum.each(ref_vars, fn var ->
if is_list(var) do
Enum.each(var, fn {finding, v} ->
if (Enum.member?(params, v) || v === "conn.params") && is_html do
print_resp_finding(line_no, filename, fun_name, fun, v, :high, finding)
end
if is_html && !Enum.member?(params, v) do
print_resp_finding(line_no, filename, fun_name, fun, v, :medium, finding)
end
end)
end
end)
end
def parse_def(fun) do
{vars, params, {fun_name, line_no}} = Utils.get_fun_vars_and_meta(fun, 2, :send_resp)
{aliased_vars, _, _} = Utils.get_fun_vars_and_meta(fun, 2, :send_resp, :Conn)
is_html =
Utils.get_funs_of_type(fun, :put_resp_content_type)
|> Kernel.++(Utils.get_aliased_funs_of_type(fun, :put_resp_content_type, :Conn))
|> Enum.any?(&Utils.is_content_type_html/1)
{vars ++ aliased_vars, is_html, params, {fun_name, line_no}}
end
def details() do
Sobelow.XSS.details()
end
defp print_resp_finding(line_no, filename, fun_name, fun, var, severity, finding) do
Utils.add_finding(
line_no,
filename,
fun,
fun_name,
var,
severity,
finding,
"XSS in `send_resp`"
)
end
end