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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.OAuth.OAuthController do
   6   use Pleroma.Web, :controller
   7
   8   alias Pleroma.Registration
   9   alias Pleroma.Repo
  10   alias Pleroma.User
  11   alias Pleroma.Web.Auth.Authenticator
  12   alias Pleroma.Web.ControllerHelper
  13   alias Pleroma.Web.OAuth.App
  14   alias Pleroma.Web.OAuth.Authorization
  15   alias Pleroma.Web.OAuth.Token
  16
  17   import Pleroma.Web.ControllerHelper, only: [oauth_scopes: 2]
  18
  19   if Pleroma.Config.oauth_consumer_enabled?(), do: plug(Ueberauth)
  20
  21   plug(:fetch_session)
  22   plug(:fetch_flash)
  23
  24   action_fallback(Pleroma.Web.OAuth.FallbackController)
  25
  26   def authorize(%{assigns: %{token: %Token{} = token}} = conn, params) do
  27     if ControllerHelper.truthy_param?(params["force_login"]) do
  28       do_authorize(conn, params)
  29     else
  30       redirect_uri =
  31         if is_binary(params["redirect_uri"]) do
  32           params["redirect_uri"]
  33         else
  34           app = Repo.preload(token, :app).app
  35
  36           app.redirect_uris
  37           |> String.split()
  38           |> Enum.at(0)
  39         end
  40
  41       redirect(conn, external: redirect_uri(conn, redirect_uri))
  42     end
  43   end
  44
  45   def authorize(conn, params), do: do_authorize(conn, params)
  46
  47   defp do_authorize(conn, %{"authorization" => auth_attrs}) do
  48     app = Repo.get_by(App, client_id: auth_attrs["client_id"])
  49     available_scopes = (app && app.scopes) || []
  50     scopes = oauth_scopes(auth_attrs, nil) || available_scopes
  51
  52     render(conn, Authenticator.auth_template(), %{
  53       response_type: auth_attrs["response_type"],
  54       client_id: auth_attrs["client_id"],
  55       available_scopes: available_scopes,
  56       scopes: scopes,
  57       redirect_uri: auth_attrs["redirect_uri"],
  58       state: auth_attrs["state"],
  59       params: auth_attrs
  60     })
  61   end
  62
  63   defp do_authorize(conn, auth_attrs), do: do_authorize(conn, %{"authorization" => auth_attrs})
  64
  65   def create_authorization(
  66         conn,
  67         %{"authorization" => _} = params,
  68         opts \\ []
  69       ) do
  70     with {:ok, auth} <- do_create_authorization(conn, params, opts[:user]) do
  71       after_create_authorization(conn, auth, params)
  72     else
  73       error ->
  74         handle_create_authorization_error(conn, error, params)
  75     end
  76   end
  77
  78   def after_create_authorization(conn, auth, %{
  79         "authorization" => %{"redirect_uri" => redirect_uri} = auth_attrs
  80       }) do
  81     redirect_uri = redirect_uri(conn, redirect_uri)
  82
  83     if redirect_uri == "urn:ietf:wg:oauth:2.0:oob" do
  84       render(conn, "results.html", %{
  85         auth: auth
  86       })
  87     else
  88       connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
  89       url = "#{redirect_uri}#{connector}"
  90       url_params = %{:code => auth.token}
  91
  92       url_params =
  93         if auth_attrs["state"] do
  94           Map.put(url_params, :state, auth_attrs["state"])
  95         else
  96           url_params
  97         end
  98
  99       url = "#{url}#{Plug.Conn.Query.encode(url_params)}"
 100
 101       redirect(conn, external: url)
 102     end
 103   end
 104
 105   defp handle_create_authorization_error(
 106          conn,
 107          {scopes_issue, _},
 108          %{"authorization" => _} = params
 109        )
 110        when scopes_issue in [:unsupported_scopes, :missing_scopes] do
 111     # Per https://github.com/tootsuite/mastodon/blob/
 112     #   51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L39
 113     conn
 114     |> put_flash(:error, "This action is outside the authorized scopes")
 115     |> put_status(:unauthorized)
 116     |> authorize(params)
 117   end
 118
 119   defp handle_create_authorization_error(
 120          conn,
 121          {:auth_active, false},
 122          %{"authorization" => _} = params
 123        ) do
 124     # Per https://github.com/tootsuite/mastodon/blob/
 125     #   51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
 126     conn
 127     |> put_flash(:error, "Your login is missing a confirmed e-mail address")
 128     |> put_status(:forbidden)
 129     |> authorize(params)
 130   end
 131
 132   defp handle_create_authorization_error(conn, error, %{"authorization" => _}) do
 133     Authenticator.handle_error(conn, error)
 134   end
 135
 136   def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
 137     with %App{} = app <- get_app_from_request(conn, params),
 138          fixed_token = fix_padding(params["code"]),
 139          %Authorization{} = auth <-
 140            Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
 141          %User{} = user <- User.get_by_id(auth.user_id),
 142          {:ok, token} <- Token.exchange_token(app, auth),
 143          {:ok, inserted_at} <- DateTime.from_naive(token.inserted_at, "Etc/UTC") do
 144       response = %{
 145         token_type: "Bearer",
 146         access_token: token.token,
 147         refresh_token: token.refresh_token,
 148         created_at: DateTime.to_unix(inserted_at),
 149         expires_in: 60 * 10,
 150         scope: Enum.join(token.scopes, " "),
 151         me: user.ap_id
 152       }
 153
 154       json(conn, response)
 155     else
 156       _error ->
 157         put_status(conn, 400)
 158         |> json(%{error: "Invalid credentials"})
 159     end
 160   end
 161
 162   def token_exchange(
 163         conn,
 164         %{"grant_type" => "password"} = params
 165       ) do
 166     with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
 167          %App{} = app <- get_app_from_request(conn, params),
 168          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
 169          {:user_active, true} <- {:user_active, !user.info.deactivated},
 170          scopes <- oauth_scopes(params, app.scopes),
 171          [] <- scopes -- app.scopes,
 172          true <- Enum.any?(scopes),
 173          {:ok, auth} <- Authorization.create_authorization(app, user, scopes),
 174          {:ok, token} <- Token.exchange_token(app, auth) do
 175       response = %{
 176         token_type: "Bearer",
 177         access_token: token.token,
 178         refresh_token: token.refresh_token,
 179         expires_in: 60 * 10,
 180         scope: Enum.join(token.scopes, " "),
 181         me: user.ap_id
 182       }
 183
 184       json(conn, response)
 185     else
 186       {:auth_active, false} ->
 187         # Per https://github.com/tootsuite/mastodon/blob/
 188         #   51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
 189         conn
 190         |> put_status(:forbidden)
 191         |> json(%{error: "Your login is missing a confirmed e-mail address"})
 192
 193       {:user_active, false} ->
 194         conn
 195         |> put_status(:forbidden)
 196         |> json(%{error: "Your account is currently disabled"})
 197
 198       _error ->
 199         put_status(conn, 400)
 200         |> json(%{error: "Invalid credentials"})
 201     end
 202   end
 203
 204   def token_exchange(
 205         conn,
 206         %{"grant_type" => "password", "name" => name, "password" => _password} = params
 207       ) do
 208     params =
 209       params
 210       |> Map.delete("name")
 211       |> Map.put("username", name)
 212
 213     token_exchange(conn, params)
 214   end
 215
 216   def token_revoke(conn, %{"token" => token} = params) do
 217     with %App{} = app <- get_app_from_request(conn, params),
 218          %Token{} = token <- Repo.get_by(Token, token: token, app_id: app.id),
 219          {:ok, %Token{}} <- Repo.delete(token) do
 220       json(conn, %{})
 221     else
 222       _error ->
 223         # RFC 7009: invalid tokens [in the request] do not cause an error response
 224         json(conn, %{})
 225     end
 226   end
 227
 228   @doc "Prepares OAuth request to provider for Ueberauth"
 229   def prepare_request(conn, %{"provider" => provider, "authorization" => auth_attrs}) do
 230     scope =
 231       oauth_scopes(auth_attrs, [])
 232       |> Enum.join(" ")
 233
 234     state =
 235       auth_attrs
 236       |> Map.delete("scopes")
 237       |> Map.put("scope", scope)
 238       |> Poison.encode!()
 239
 240     params =
 241       auth_attrs
 242       |> Map.drop(~w(scope scopes client_id redirect_uri))
 243       |> Map.put("state", state)
 244
 245     # Handing the request to Ueberauth
 246     redirect(conn, to: o_auth_path(conn, :request, provider, params))
 247   end
 248
 249   def request(conn, params) do
 250     message =
 251       if params["provider"] do
 252         "Unsupported OAuth provider: #{params["provider"]}."
 253       else
 254         "Bad OAuth request."
 255       end
 256
 257     conn
 258     |> put_flash(:error, message)
 259     |> redirect(to: "/")
 260   end
 261
 262   def callback(%{assigns: %{ueberauth_failure: failure}} = conn, params) do
 263     params = callback_params(params)
 264     messages = for e <- Map.get(failure, :errors, []), do: e.message
 265     message = Enum.join(messages, "; ")
 266
 267     conn
 268     |> put_flash(:error, "Failed to authenticate: #{message}.")
 269     |> redirect(external: redirect_uri(conn, params["redirect_uri"]))
 270   end
 271
 272   def callback(conn, params) do
 273     params = callback_params(params)
 274
 275     with {:ok, registration} <- Authenticator.get_registration(conn) do
 276       user = Repo.preload(registration, :user).user
 277       auth_attrs = Map.take(params, ~w(client_id redirect_uri scope scopes state))
 278
 279       if user do
 280         create_authorization(
 281           conn,
 282           %{"authorization" => auth_attrs},
 283           user: user
 284         )
 285       else
 286         registration_params =
 287           Map.merge(auth_attrs, %{
 288             "nickname" => Registration.nickname(registration),
 289             "email" => Registration.email(registration)
 290           })
 291
 292         conn
 293         |> put_session(:registration_id, registration.id)
 294         |> registration_details(%{"authorization" => registration_params})
 295       end
 296     else
 297       _ ->
 298         conn
 299         |> put_flash(:error, "Failed to set up user account.")
 300         |> redirect(external: redirect_uri(conn, params["redirect_uri"]))
 301     end
 302   end
 303
 304   defp callback_params(%{"state" => state} = params) do
 305     Map.merge(params, Poison.decode!(state))
 306   end
 307
 308   def registration_details(conn, %{"authorization" => auth_attrs}) do
 309     render(conn, "register.html", %{
 310       client_id: auth_attrs["client_id"],
 311       redirect_uri: auth_attrs["redirect_uri"],
 312       state: auth_attrs["state"],
 313       scopes: oauth_scopes(auth_attrs, []),
 314       nickname: auth_attrs["nickname"],
 315       email: auth_attrs["email"]
 316     })
 317   end
 318
 319   def register(conn, %{"authorization" => _, "op" => "connect"} = params) do
 320     with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
 321          %Registration{} = registration <- Repo.get(Registration, registration_id),
 322          {_, {:ok, auth}} <-
 323            {:create_authorization, do_create_authorization(conn, params)},
 324          %User{} = user <- Repo.preload(auth, :user).user,
 325          {:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
 326       conn
 327       |> put_session_registration_id(nil)
 328       |> after_create_authorization(auth, params)
 329     else
 330       {:create_authorization, error} ->
 331         {:register, handle_create_authorization_error(conn, error, params)}
 332
 333       _ ->
 334         {:register, :generic_error}
 335     end
 336   end
 337
 338   def register(conn, %{"authorization" => _, "op" => "register"} = params) do
 339     with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
 340          %Registration{} = registration <- Repo.get(Registration, registration_id),
 341          {:ok, user} <- Authenticator.create_from_registration(conn, registration) do
 342       conn
 343       |> put_session_registration_id(nil)
 344       |> create_authorization(
 345         params,
 346         user: user
 347       )
 348     else
 349       {:error, changeset} ->
 350         message =
 351           Enum.map(changeset.errors, fn {field, {error, _}} ->
 352             "#{field} #{error}"
 353           end)
 354           |> Enum.join("; ")
 355
 356         message =
 357           String.replace(
 358             message,
 359             "ap_id has already been taken",
 360             "nickname has already been taken"
 361           )
 362
 363         conn
 364         |> put_status(:forbidden)
 365         |> put_flash(:error, "Error: #{message}.")
 366         |> registration_details(params)
 367
 368       _ ->
 369         {:register, :generic_error}
 370     end
 371   end
 372
 373   defp do_create_authorization(
 374          conn,
 375          %{
 376            "authorization" =>
 377              %{
 378                "client_id" => client_id,
 379                "redirect_uri" => redirect_uri
 380              } = auth_attrs
 381          },
 382          user \\ nil
 383        ) do
 384     with {_, {:ok, %User{} = user}} <-
 385            {:get_user, (user && {:ok, user}) || Authenticator.get_user(conn)},
 386          %App{} = app <- Repo.get_by(App, client_id: client_id),
 387          true <- redirect_uri in String.split(app.redirect_uris),
 388          scopes <- oauth_scopes(auth_attrs, []),
 389          {:unsupported_scopes, []} <- {:unsupported_scopes, scopes -- app.scopes},
 390          # Note: `scope` param is intentionally not optional in this context
 391          {:missing_scopes, false} <- {:missing_scopes, scopes == []},
 392          {:auth_active, true} <- {:auth_active, User.auth_active?(user)} do
 393       Authorization.create_authorization(app, user, scopes)
 394     end
 395   end
 396
 397   # XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be
 398   # decoding it.  Investigate sometime.
 399   defp fix_padding(token) do
 400     token
 401     |> URI.decode()
 402     |> Base.url_decode64!(padding: false)
 403     |> Base.url_encode64(padding: false)
 404   end
 405
 406   defp get_app_from_request(conn, params) do
 407     # Per RFC 6749, HTTP Basic is preferred to body params
 408     {client_id, client_secret} =
 409       with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
 410            {:ok, decoded} <- Base.decode64(encoded),
 411            [id, secret] <-
 412              String.split(decoded, ":")
 413              |> Enum.map(fn s -> URI.decode_www_form(s) end) do
 414         {id, secret}
 415       else
 416         _ -> {params["client_id"], params["client_secret"]}
 417       end
 418
 419     if client_id && client_secret do
 420       Repo.get_by(
 421         App,
 422         client_id: client_id,
 423         client_secret: client_secret
 424       )
 425     else
 426       nil
 427     end
 428   end
 429
 430   # Special case: Local MastodonFE
 431   defp redirect_uri(conn, "."), do: mastodon_api_url(conn, :login)
 432
 433   defp redirect_uri(_conn, redirect_uri), do: redirect_uri
 434
 435   defp get_session_registration_id(conn), do: get_session(conn, :registration_id)
 436
 437   defp put_session_registration_id(conn, registration_id),
 438     do: put_session(conn, :registration_id, registration_id)
 439 end