# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.MediaProxy do
- @base64_opts [padding: false]
-
- def url(nil), do: nil
+ alias Pleroma.Config
+ alias Pleroma.Web
- def url(""), do: nil
+ @base64_opts [padding: false]
+ def url(url) when is_nil(url) or url == "", do: nil
def url("/" <> _ = url), do: url
def url(url) do
- if !enabled?() or local?(url) or whitelisted?(url) do
+ if disabled?() or local?(url) or whitelisted?(url) do
url
else
encode_url(url)
end
end
- defp enabled?, do: Pleroma.Config.get([:media_proxy, :enabled], false)
+ defp disabled?, do: !Config.get([:media_proxy, :enabled], false)
defp local?(url), do: String.starts_with?(url, Pleroma.Web.base_url())
defp whitelisted?(url) do
%{host: domain} = URI.parse(url)
- Enum.any?(Pleroma.Config.get([:media_proxy, :whitelist]), fn pattern ->
+ Enum.any?(Config.get([:media_proxy, :whitelist]), fn pattern ->
String.equivalent?(domain, pattern)
end)
end
def encode_url(url) do
- secret = Pleroma.Config.get([Pleroma.Web.Endpoint, :secret_key_base])
base64 = Base.url_encode64(url, @base64_opts)
- sig = :crypto.hmac(:sha, secret, base64)
- sig64 = sig |> Base.url_encode64(@base64_opts)
+
+ sig64 =
+ base64
+ |> signed_url
+ |> Base.url_encode64(@base64_opts)
build_url(sig64, base64, filename(url))
end
def decode_url(sig, url) do
- secret = Pleroma.Config.get([Pleroma.Web.Endpoint, :secret_key_base])
- sig = Base.url_decode64!(sig, @base64_opts)
- local_sig = :crypto.hmac(:sha, secret, url)
-
- if local_sig == sig do
+ with {:ok, sig} <- Base.url_decode64(sig, @base64_opts),
+ signature when signature == sig <- signed_url(url) do
{:ok, Base.url_decode64!(url, @base64_opts)}
else
- {:error, :invalid_signature}
+ _ -> {:error, :invalid_signature}
end
end
+ defp signed_url(url) do
+ :crypto.hmac(:sha, Config.get([Web.Endpoint, :secret_key_base]), url)
+ end
+
def filename(url_or_path) do
if path = URI.parse(url_or_path).path, do: Path.basename(path)
end
def build_url(sig_base64, url_base64, filename \\ nil) do
[
- Pleroma.Config.get([:media_proxy, :base_url], Pleroma.Web.base_url()),
+ Pleroma.Config.get([:media_proxy, :base_url], Web.base_url()),
"proxy",
sig_base64,
url_base64,
filename
]
- |> Enum.filter(fn value -> value end)
+ |> Enum.filter(& &1)
|> Path.join()
end
end
with config <- Pleroma.Config.get([:media_proxy], []),
true <- Keyword.get(config, :enabled, false),
{:ok, url} <- MediaProxy.decode_url(sig64, url64),
- :ok <- filename_matches(Map.has_key?(params, "filename"), conn.request_path, url) do
+ :ok <- filename_matches(params, conn.request_path, url) do
ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_opts))
else
false ->
end
end
- def filename_matches(has_filename, path, url) do
- filename = url |> MediaProxy.filename()
+ def filename_matches(%{"filename" => _} = _, path, url) do
+ filename = MediaProxy.filename(url)
- if has_filename && filename && Path.basename(path) != filename do
+ if filename && Path.basename(path) != filename do
{:wrong_filename, filename}
else
:ok
end
end
+
+ def filename_matches(_, _, _), do: :ok
end
aliases: aliases(),
deps: deps(),
test_coverage: [tool: ExCoveralls],
-
+ preferred_cli_env: ["coveralls.html": :test],
# Docs
name: "Pleroma",
homepage_url: "https://pleroma.social/",
--- /dev/null
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
+ use Pleroma.Web.ConnCase
+ import Mock
+ alias Pleroma.Config
+
+ setup do
+ media_proxy_config = Config.get([:media_proxy]) || []
+ on_exit(fn -> Config.put([:media_proxy], media_proxy_config) end)
+ :ok
+ end
+
+ test "it returns 404 when MediaProxy disabled", %{conn: conn} do
+ Config.put([:media_proxy, :enabled], false)
+
+ assert %Plug.Conn{
+ status: 404,
+ resp_body: "Not Found"
+ } = get(conn, "/proxy/hhgfh/eeeee")
+
+ assert %Plug.Conn{
+ status: 404,
+ resp_body: "Not Found"
+ } = get(conn, "/proxy/hhgfh/eeee/fff")
+ end
+
+ test "it returns 403 when signature invalidated", %{conn: conn} do
+ Config.put([:media_proxy, :enabled], true)
+ Config.put([Pleroma.Web.Endpoint, :secret_key_base], "00000000000")
+ path = URI.parse(Pleroma.Web.MediaProxy.encode_url("https://google.fn")).path
+ Config.put([Pleroma.Web.Endpoint, :secret_key_base], "000")
+
+ assert %Plug.Conn{
+ status: 403,
+ resp_body: "Forbidden"
+ } = get(conn, path)
+
+ assert %Plug.Conn{
+ status: 403,
+ resp_body: "Forbidden"
+ } = get(conn, "/proxy/hhgfh/eeee")
+
+ assert %Plug.Conn{
+ status: 403,
+ resp_body: "Forbidden"
+ } = get(conn, "/proxy/hhgfh/eeee/fff")
+ end
+
+ test "redirects on valid url when filename invalidated", %{conn: conn} do
+ Config.put([:media_proxy, :enabled], true)
+ Config.put([Pleroma.Web.Endpoint, :secret_key_base], "00000000000")
+ url = Pleroma.Web.MediaProxy.encode_url("https://google.fn/test.png")
+ invalid_url = String.replace(url, "test.png", "test-file.png")
+ response = get(conn, invalid_url)
+ html = "<html><body>You are being <a href=\"#{url}\">redirected</a>.</body></html>"
+ assert response.status == 302
+ assert response.resp_body == html
+ end
+
+ test "it performs ReverseProxy.call when signature valid", %{conn: conn} do
+ Config.put([:media_proxy, :enabled], true)
+ Config.put([Pleroma.Web.Endpoint, :secret_key_base], "00000000000")
+ url = Pleroma.Web.MediaProxy.encode_url("https://google.fn/test.png")
+
+ with_mock Pleroma.ReverseProxy,
+ call: fn _conn, _url, _opts -> %Plug.Conn{status: :success} end do
+ assert %Plug.Conn{status: :success} = get(conn, url)
+ end
+ end
+end
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
-defmodule Pleroma.MediaProxyTest do
+defmodule Pleroma.Web.MediaProxyTest do
use ExUnit.Case
import Pleroma.Web.MediaProxy
alias Pleroma.Web.MediaProxy.MediaProxyController
test "filename_matches preserves the encoded or decoded path" do
assert MediaProxyController.filename_matches(
- true,
+ %{"filename" => "/Hello world.jpg"},
"/Hello world.jpg",
"http://pleroma.social/Hello world.jpg"
) == :ok
assert MediaProxyController.filename_matches(
- true,
+ %{"filename" => "/Hello%20world.jpg"},
"/Hello%20world.jpg",
"http://pleroma.social/Hello%20world.jpg"
) == :ok
assert MediaProxyController.filename_matches(
- true,
+ %{"filename" => "/my%2Flong%2Furl%2F2019%2F07%2FS.jpg"},
"/my%2Flong%2Furl%2F2019%2F07%2FS.jpg",
"http://pleroma.social/my%2Flong%2Furl%2F2019%2F07%2FS.jpg"
) == :ok
+
+ assert MediaProxyController.filename_matches(
+ %{"filename" => "/my%2Flong%2Furl%2F2019%2F07%2FS.jp"},
+ "/my%2Flong%2Furl%2F2019%2F07%2FS.jp",
+ "http://pleroma.social/my%2Flong%2Furl%2F2019%2F07%2FS.jpg"
+ ) == {:wrong_filename, "my%2Flong%2Furl%2F2019%2F07%2FS.jpg"}
end
test "uses the configured base_url" do
projects / akkoma / commitdiff