# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Web.OAuth.OAuthController do use Pleroma.Web, :controller alias Pleroma.Web.OAuth.{Authorization, Token, App} alias Pleroma.{Repo, User} alias Comeonin.Pbkdf2 plug(:fetch_session) plug(:fetch_flash) action_fallback(Pleroma.Web.OAuth.FallbackController) def authorize(conn, params) do render(conn, "show.html", %{ response_type: params["response_type"], client_id: params["client_id"], scope: params["scope"], redirect_uri: params["redirect_uri"], state: params["state"] }) end def create_authorization(conn, %{ "authorization" => %{ "name" => name, "password" => password, "client_id" => client_id, "redirect_uri" => redirect_uri } = params }) do with %User{} = user <- User.get_by_nickname_or_email(name), 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), {:ok, auth} <- Authorization.create_authorization(app, user) do # Special case: Local MastodonFE. redirect_uri = if redirect_uri == "." do mastodon_api_url(conn, :login) else redirect_uri end cond do redirect_uri == "urn:ietf:wg:oauth:2.0:oob" -> render(conn, "results.html", %{ auth: auth }) true -> connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?" url = "#{redirect_uri}#{connector}" url_params = %{:code => auth.token} url_params = if params["state"] do Map.put(url_params, :state, params["state"]) else url_params end url = "#{url}#{Plug.Conn.Query.encode(url_params)}" redirect(conn, external: url) end else {:auth_active, false} -> conn |> put_flash(:error, "Account confirmation pending") |> put_status(:forbidden) |> authorize(params) error -> error end end # TODO # - proper scope handling def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do with %App{} = app <- get_app_from_request(conn, params), fixed_token = fix_padding(params["code"]), %Authorization{} = auth <- Repo.get_by(Authorization, token: fixed_token, app_id: app.id), {:ok, token} <- Token.exchange_token(app, auth), {:ok, inserted_at} <- DateTime.from_naive(token.inserted_at, "Etc/UTC") do response = %{ token_type: "Bearer", access_token: token.token, refresh_token: token.refresh_token, created_at: DateTime.to_unix(inserted_at), expires_in: 60 * 10, scope: "read write follow" } json(conn, response) else _error -> put_status(conn, 400) |> json(%{error: "Invalid credentials"}) end end # TODO # - investigate a way to verify the user wants to grant read/write/follow once scope handling is done def token_exchange( conn, %{"grant_type" => "password", "username" => name, "password" => password} = params ) do with %App{} = app <- get_app_from_request(conn, params), %User{} = user <- User.get_by_nickname_or_email(name), true <- Pbkdf2.checkpw(password, user.password_hash), {:auth_active, true} <- {:auth_active, User.auth_active?(user)}, {:ok, auth} <- Authorization.create_authorization(app, user), {:ok, token} <- Token.exchange_token(app, auth) do response = %{ token_type: "Bearer", access_token: token.token, refresh_token: token.refresh_token, expires_in: 60 * 10, scope: "read write follow" } json(conn, response) else {:auth_active, false} -> conn |> put_status(:forbidden) |> json(%{error: "Account confirmation pending"}) _error -> put_status(conn, 400) |> json(%{error: "Invalid credentials"}) end end def token_exchange( conn, %{"grant_type" => "password", "name" => name, "password" => _password} = params ) do params = params |> Map.delete("name") |> Map.put("username", name) token_exchange(conn, params) end def token_revoke(conn, %{"token" => token} = params) do with %App{} = app <- get_app_from_request(conn, params), %Token{} = token <- Repo.get_by(Token, token: token, app_id: app.id), {:ok, %Token{}} <- Repo.delete(token) do json(conn, %{}) else _error -> # RFC 7009: invalid tokens [in the request] do not cause an error response json(conn, %{}) end end # XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be # decoding it. Investigate sometime. defp fix_padding(token) do token |> URI.decode() |> Base.url_decode64!(padding: false) |> Base.url_encode64() end defp get_app_from_request(conn, params) do # Per RFC 6749, HTTP Basic is preferred to body params {client_id, client_secret} = with ["Basic " <> encoded] <- get_req_header(conn, "authorization"), {:ok, decoded} <- Base.decode64(encoded), [id, secret] <- String.split(decoded, ":") |> Enum.map(fn s -> URI.decode_www_form(s) end) do {id, secret} else _ -> {params["client_id"], params["client_secret"]} end if client_id && client_secret do Repo.get_by( App, client_id: client_id, client_secret: client_secret ) else nil end end end