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