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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.OAuth.MFAController do
   6   @moduledoc """
   7   The model represents api to use Multi Factor authentications.
   8   """
   9
  10   use Pleroma.Web, :controller
  11
  12   alias Pleroma.MFA
  13   alias Pleroma.Web.Auth.TOTPAuthenticator
  14   alias Pleroma.Web.OAuth.MFAView, as: View
  15   alias Pleroma.Web.OAuth.OAuthController
  16   alias Pleroma.Web.OAuth.Token
  17
  18   plug(:fetch_session when action in [:show, :verify])
  19   plug(:fetch_flash when action in [:show, :verify])
  20
  21   @doc """
  22   Display form to input mfa code or recovery code.
  23   """
  24   def show(conn, %{"mfa_token" => mfa_token} = params) do
  25     template = Map.get(params, "challenge_type", "totp")
  26
  27     conn
  28     |> put_view(View)
  29     |> render("#{template}.html", %{
  30       mfa_token: mfa_token,
  31       redirect_uri: params["redirect_uri"],
  32       state: params["state"]
  33     })
  34   end
  35
  36   @doc """
  37   Verification code and continue authorization.
  38   """
  39   def verify(conn, %{"mfa" => %{"mfa_token" => mfa_token} = mfa_params} = _) do
  40     with {:ok, %{user: user, authorization: auth}} <- MFA.Token.validate(mfa_token),
  41          {:ok, _} <- validates_challenge(user, mfa_params) do
  42       conn
  43       |> OAuthController.after_create_authorization(auth, %{
  44         "authorization" => %{
  45           "redirect_uri" => mfa_params["redirect_uri"],
  46           "state" => mfa_params["state"]
  47         }
  48       })
  49     else
  50       _ ->
  51         conn
  52         |> put_flash(:error, "Two-factor authentication failed.")
  53         |> put_status(:unauthorized)
  54         |> show(mfa_params)
  55     end
  56   end
  57
  58   @doc """
  59   Verification second step of MFA (or recovery) and returns access token.
  60
  61   ## Endpoint
  62   POST /oauth/mfa/challenge
  63
  64   params:
  65   `client_id`
  66   `client_secret`
  67   `mfa_token` - access token to check second step of mfa
  68   `challenge_type` - 'totp' or 'recovery'
  69   `code`
  70
  71   """
  72   def challenge(conn, %{"mfa_token" => mfa_token} = params) do
  73     with {:ok, app} <- Token.Utils.fetch_app(conn),
  74          {:ok, %{user: user, authorization: auth}} <- MFA.Token.validate(mfa_token),
  75          {:ok, _} <- validates_challenge(user, params),
  76          {:ok, token} <- Token.exchange_token(app, auth) do
  77       OAuthController.after_token_exchange(conn, %{user: user, token: token})
  78     else
  79       _error ->
  80         conn
  81         |> put_status(400)
  82         |> json(%{error: "Invalid code"})
  83     end
  84   end
  85
  86   # Verify TOTP Code
  87   defp validates_challenge(user, %{"challenge_type" => "totp", "code" => code} = _) do
  88     TOTPAuthenticator.verify(code, user)
  89   end
  90
  91   # Verify Recovery Code
  92   defp validates_challenge(user, %{"challenge_type" => "recovery", "code" => code} = _) do
  93     TOTPAuthenticator.verify_recovery_code(user, code)
  94   end
  95
  96   defp validates_challenge(_, _), do: {:error, :unsupported_challenge_type}
  97 end