Commit 2c68cf7e authored by Ivan Tashkinov's avatar Ivan Tashkinov

OAuth2 security fixes: redirect URI validation, "Mastodon-Local" security breach fix.

(`POST /api/v1/apps` could create "Mastodon-Local" app wth any redirect_uris,
and if that happened before /web/login is accessed for the first time
then Pleroma used this externally created record with arbitrary
redirect_uris and client_secret known by creator).
parent d84392c9
......@@ -26,12 +26,14 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
require Logger
@httpoison Application.get_env(:pleroma, :httpoison)
@local_mastodon_name "Mastodon-Local"
def create_app(conn, params) do
with cs <- App.register_changeset(%App{}, params) |> IO.inspect(),
{:ok, app} <- Repo.insert(cs) |> IO.inspect() do
with cs <- App.register_changeset(%App{}, params),
false <- cs.changes[:client_name] == @local_mastodon_name,
{:ok, app} <- Repo.insert(cs) do
res = %{
id: |> to_string,
name: app.client_name,
......@@ -1154,16 +1156,13 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
defp get_or_make_app() do
with %App{} = app <- Repo.get_by(App, client_name: "Mastodon-Local") do
find_attrs = %{client_name: @local_mastodon_name, redirect_uris: "."}
with %App{} = app <- Repo.get_by(App, find_attrs) do
{:ok, app}
_e ->
cs =
App.register_changeset(%App{}, %{
client_name: "Mastodon-Local",
redirect_uris: ".",
scopes: "read,write,follow"
cs = App.register_changeset(%App{}, Map.put(find_attrs, :scopes, "read,write,follow"))
......@@ -37,6 +37,7 @@ defmodule Pleroma.Web.OAuth.OAuthController do
true <- Pbkdf2.checkpw(password, user.password_hash),
{:auth_active, true} <- {:auth_active, User.auth_active?(user)},
%App{} = app <- Repo.get_by(App, client_id: client_id),
true <- redirect_uri in String.split(app.redirect_uris),
{:ok, auth} <- Authorization.create_authorization(app, user) do
# Special case: Local MastodonFE.
redirect_uri =
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