98 lines
2.9 KiB
Elixir
98 lines
2.9 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.OAuth.MFAController do
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@moduledoc """
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The model represents api to use Multi Factor authentications.
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"""
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use Pleroma.Web, :controller
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alias Pleroma.MFA
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alias Pleroma.Web.Auth.TOTPAuthenticator
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alias Pleroma.Web.OAuth.MFAView, as: View
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alias Pleroma.Web.OAuth.OAuthController
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alias Pleroma.Web.OAuth.OAuthView
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alias Pleroma.Web.OAuth.Token
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plug(:fetch_session when action in [:show, :verify])
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plug(:fetch_flash when action in [:show, :verify])
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@doc """
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Display form to input mfa code or recovery code.
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"""
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def show(conn, %{"mfa_token" => mfa_token} = params) do
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template = Map.get(params, "challenge_type", "totp")
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conn
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|> put_view(View)
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|> render("#{template}.html", %{
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mfa_token: mfa_token,
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redirect_uri: params["redirect_uri"],
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state: params["state"]
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})
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end
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@doc """
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Verification code and continue authorization.
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"""
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def verify(conn, %{"mfa" => %{"mfa_token" => mfa_token} = mfa_params} = _) do
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with {:ok, %{user: user, authorization: auth}} <- MFA.Token.validate(mfa_token),
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{:ok, _} <- validates_challenge(user, mfa_params) do
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conn
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|> OAuthController.after_create_authorization(auth, %{
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"authorization" => %{
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"redirect_uri" => mfa_params["redirect_uri"],
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"state" => mfa_params["state"]
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}
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})
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else
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_ ->
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conn
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|> put_flash(:error, "Two-factor authentication failed.")
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|> put_status(:unauthorized)
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|> show(mfa_params)
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end
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end
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@doc """
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Verification second step of MFA (or recovery) and returns access token.
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## Endpoint
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POST /oauth/mfa/challenge
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params:
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`client_id`
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`client_secret`
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`mfa_token` - access token to check second step of mfa
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`challenge_type` - 'totp' or 'recovery'
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`code`
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"""
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def challenge(conn, %{"mfa_token" => mfa_token} = params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, %{user: user, authorization: auth}} <- MFA.Token.validate(mfa_token),
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{:ok, _} <- validates_challenge(user, params),
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{:ok, token} <- Token.exchange_token(app, auth) do
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json(conn, OAuthView.render("token.json", %{user: user, token: token}))
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else
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_error ->
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conn
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|> put_status(400)
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|> json(%{error: "Invalid code"})
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end
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end
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# Verify TOTP Code
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defp validates_challenge(user, %{"challenge_type" => "totp", "code" => code} = _) do
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TOTPAuthenticator.verify(code, user)
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end
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# Verify Recovery Code
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defp validates_challenge(user, %{"challenge_type" => "recovery", "code" => code} = _) do
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TOTPAuthenticator.verify_recovery_code(user, code)
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end
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defp validates_challenge(_, _), do: {:error, :unsupported_challenge_type}
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end
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