Validate Host header matches expected value before allowing access to MediaProxy
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506a1c98e7
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@ -12,6 +12,7 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyController do
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alias Pleroma.Web.MediaProxy
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alias Plug.Conn
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plug(:validate_host)
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plug(:sandbox)
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def remote(conn, %{"sig" => sig64, "url" => url64}) do
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@ -205,6 +206,17 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyController do
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Config.get([:media_proxy, :proxy_opts], [])
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end
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defp validate_host(conn, _params) do
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proxy_host = MediaProxy.base_url() |> URI.parse() |> Map.get(:host)
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if match?(^proxy_host, conn.host) do
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conn
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else
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send_resp(conn, 400, Conn.Status.reason_phrase(400))
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|> halt()
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end
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end
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defp sandbox(conn, _params) do
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conn
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|> merge_resp_headers([{"content-security-policy", "sandbox;"}])
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@ -54,6 +54,23 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
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} = get(conn, "/proxy/hhgfh/eeee/fff")
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end
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test "it returns a 400 for invalid host", %{conn: conn} do
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clear_config([:media_proxy, :base_url], "http://mp.localhost/")
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url =
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MediaProxy.encode_url("https://pleroma.social/logo.jpeg")
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|> URI.parse()
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|> Map.put(:host, "wronghost")
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|> URI.to_string()
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with_mock Pleroma.ReverseProxy,
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call: fn _conn, _url, _opts -> %Conn{status: :success} end do
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%{status: status} = get(conn, url)
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assert status == 400
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end
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end
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test "redirects to valid url when filename is invalidated", %{conn: conn, url: url} do
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invalid_url = String.replace(url, "test.png", "test-file.png")
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response = get(conn, invalid_url)
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