[#1682] Fixed Basic Auth permissions issue by disabling OAuth scopes checks when password is provided. Refactored plugs skipping functionality.

test/plugs/authentication_plug_test.exs

@@ -6,6 +6,8 @@ defmodule Pleroma.Plugs.AuthenticationPlugTest do
   use Pleroma.Web.ConnCase, async: true
 
   alias Pleroma.Plugs.AuthenticationPlug
+  alias Pleroma.Plugs.OAuthScopesPlug
+  alias Pleroma.Plugs.PlugHelper
   alias Pleroma.User
 
   import ExUnit.CaptureLog
@@ -36,13 +38,16 @@ defmodule Pleroma.Plugs.AuthenticationPlugTest do
     assert ret_conn == conn
   end
 
-  test "with a correct password in the credentials, it assigns the auth_user", %{conn: conn} do
+  test "with a correct password in the credentials, " <>
+         "it assigns the auth_user and marks OAuthScopesPlug as skipped",
+       %{conn: conn} do
     conn =
       conn
       |> assign(:auth_credentials, %{password: "guy"})
       |> AuthenticationPlug.call(%{})
 
     assert conn.assigns.user == conn.assigns.auth_user
+    assert PlugHelper.plug_skipped?(conn, OAuthScopesPlug)
   end
 
   test "with a wrong password in the credentials, it does nothing", %{conn: conn} do

test/plugs/legacy_authentication_plug_test.exs

@@ -8,6 +8,8 @@ defmodule Pleroma.Plugs.LegacyAuthenticationPlugTest do
   import Pleroma.Factory
 
   alias Pleroma.Plugs.LegacyAuthenticationPlug
+  alias Pleroma.Plugs.OAuthScopesPlug
+  alias Pleroma.Plugs.PlugHelper
   alias Pleroma.User
 
   setup do
@@ -36,7 +38,8 @@ defmodule Pleroma.Plugs.LegacyAuthenticationPlugTest do
   end
 
   @tag :skip_on_mac
-  test "it authenticates the auth_user if present and password is correct and resets the password",
+  test "if `auth_user` is present and password is correct, " <>
+         "it authenticates the user, resets the password, marks OAuthScopesPlug as skipped",
        %{
          conn: conn,
          user: user
@@ -49,6 +52,7 @@ defmodule Pleroma.Plugs.LegacyAuthenticationPlugTest do
     conn = LegacyAuthenticationPlug.call(conn, %{})
 
     assert conn.assigns.user.id == user.id
+    assert PlugHelper.plug_skipped?(conn, OAuthScopesPlug)
   end
 
   @tag :skip_on_mac

test/plugs/oauth_scopes_plug_test.exs

@@ -7,7 +7,6 @@ defmodule Pleroma.Plugs.OAuthScopesPlugTest do
 
   alias Pleroma.Plugs.EnsurePublicOrAuthenticatedPlug
   alias Pleroma.Plugs.OAuthScopesPlug
-  alias Pleroma.Plugs.PlugHelper
   alias Pleroma.Repo
 
   import Mock
@@ -21,7 +20,7 @@ defmodule Pleroma.Plugs.OAuthScopesPlugTest do
     with_mock OAuthScopesPlug, [:passthrough], perform: &passthrough([&1, &2]) do
       conn =
         conn
-        |> PlugHelper.append_to_skipped_plugs(OAuthScopesPlug)
+        |> OAuthScopesPlug.skip_plug()
         |> OAuthScopesPlug.call(%{scopes: ["random_scope"]})
 
       refute called(OAuthScopesPlug.perform(:_, :_))

test/web/auth/basic_auth_test.exs

@@ -0,0 +1,46 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Auth.BasicAuthTest do
+  use Pleroma.Web.ConnCase
+
+  import Pleroma.Factory
+
+  test "with HTTP Basic Auth used, grants access to OAuth scope-restricted endpoints", %{
+    conn: conn
+  } do
+    user = insert(:user)
+    assert Comeonin.Pbkdf2.checkpw("test", user.password_hash)
+
+    basic_auth_contents =
+      (URI.encode_www_form(user.nickname) <> ":" <> URI.encode_www_form("test"))
+      |> Base.encode64()
+
+    # Succeeds with HTTP Basic Auth
+    response =
+      conn
+      |> put_req_header("authorization", "Basic " <> basic_auth_contents)
+      |> get("/api/v1/accounts/verify_credentials")
+      |> json_response(200)
+
+    user_nickname = user.nickname
+    assert %{"username" => ^user_nickname} = response
+
+    # Succeeds with a properly scoped OAuth token
+    valid_token = insert(:oauth_token, scopes: ["read:accounts"])
+
+    conn
+    |> put_req_header("authorization", "Bearer #{valid_token.token}")
+    |> get("/api/v1/accounts/verify_credentials")
+    |> json_response(200)
+
+    # Fails with a wrong-scoped OAuth token (proof of restriction)
+    invalid_token = insert(:oauth_token, scopes: ["read:something"])
+
+    conn
+    |> put_req_header("authorization", "Bearer #{invalid_token.token}")
+    |> get("/api/v1/accounts/verify_credentials")
+    |> json_response(403)
+  end
+end