git.squeep.com Git - akkoma/blob - lib/pleroma/web/oauth/oauth_controller.ex

   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.Repo
   9   alias Pleroma.User
  10   alias Pleroma.Web.Auth.Authenticator
  11   alias Pleroma.Web.OAuth.App
  12   alias Pleroma.Web.OAuth.Authorization
  13   alias Pleroma.Web.OAuth.Token
  14
  15   import Pleroma.Web.ControllerHelper, only: [oauth_scopes: 2]
  16
  17   plug(:fetch_session)
  18   plug(:fetch_flash)
  19
  20   action_fallback(Pleroma.Web.OAuth.FallbackController)
  21
  22   def authorize(conn, params) do
  23     app = Repo.get_by(App, client_id: params["client_id"])
  24     available_scopes = (app && app.scopes) || []
  25     scopes = oauth_scopes(params, nil) || available_scopes
  26
  27     render(conn, Authenticator.auth_template(), %{
  28       response_type: params["response_type"],
  29       client_id: params["client_id"],
  30       available_scopes: available_scopes,
  31       scopes: scopes,
  32       redirect_uri: params["redirect_uri"],
  33       state: params["state"],
  34       params: params
  35     })
  36   end
  37
  38   def create_authorization(conn, %{
  39         "authorization" =>
  40           %{
  41             "client_id" => client_id,
  42             "redirect_uri" => redirect_uri
  43           } = auth_params
  44       }) do
  45     with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
  46          %App{} = app <- Repo.get_by(App, client_id: client_id),
  47          true <- redirect_uri in String.split(app.redirect_uris),
  48          scopes <- oauth_scopes(auth_params, []),
  49          {:unsupported_scopes, []} <- {:unsupported_scopes, scopes -- app.scopes},
  50          # Note: `scope` param is intentionally not optional in this context
  51          {:missing_scopes, false} <- {:missing_scopes, scopes == []},
  52          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
  53          {:ok, auth} <- Authorization.create_authorization(app, user, scopes) do
  54       redirect_uri =
  55         if redirect_uri == "." do
  56           # Special case: Local MastodonFE
  57           mastodon_api_url(conn, :login)
  58         else
  59           redirect_uri
  60         end
  61
  62       cond do
  63         redirect_uri == "urn:ietf:wg:oauth:2.0:oob" ->
  64           render(conn, "results.html", %{
  65             auth: auth
  66           })
  67
  68         true ->
  69           connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
  70           url = "#{redirect_uri}#{connector}"
  71           url_params = %{:code => auth.token}
  72
  73           url_params =
  74             if auth_params["state"] do
  75               Map.put(url_params, :state, auth_params["state"])
  76             else
  77               url_params
  78             end
  79
  80           url = "#{url}#{Plug.Conn.Query.encode(url_params)}"
  81
  82           redirect(conn, external: url)
  83       end
  84     else
  85       {scopes_issue, _} when scopes_issue in [:unsupported_scopes, :missing_scopes] ->
  86         conn
  87         |> put_flash(:error, "Permissions not specified.")
  88         |> put_status(:unauthorized)
  89         |> authorize(auth_params)
  90
  91       {:auth_active, false} ->
  92         conn
  93         |> put_flash(:error, "Account confirmation pending.")
  94         |> put_status(:forbidden)
  95         |> authorize(auth_params)
  96
  97       error ->
  98         Authenticator.handle_error(conn, error)
  99     end
 100   end
 101
 102   def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
 103     with %App{} = app <- get_app_from_request(conn, params),
 104          fixed_token = fix_padding(params["code"]),
 105          %Authorization{} = auth <-
 106            Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
 107          {:ok, token} <- Token.exchange_token(app, auth),
 108          {:ok, inserted_at} <- DateTime.from_naive(token.inserted_at, "Etc/UTC") do
 109       response = %{
 110         token_type: "Bearer",
 111         access_token: token.token,
 112         refresh_token: token.refresh_token,
 113         created_at: DateTime.to_unix(inserted_at),
 114         expires_in: 60 * 10,
 115         scope: Enum.join(token.scopes, " ")
 116       }
 117
 118       json(conn, response)
 119     else
 120       _error ->
 121         put_status(conn, 400)
 122         |> json(%{error: "Invalid credentials"})
 123     end
 124   end
 125
 126   def token_exchange(
 127         conn,
 128         %{"grant_type" => "password"} = params
 129       ) do
 130     with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
 131          %App{} = app <- get_app_from_request(conn, params),
 132          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
 133          scopes <- oauth_scopes(params, app.scopes),
 134          [] <- scopes -- app.scopes,
 135          true <- Enum.any?(scopes),
 136          {:ok, auth} <- Authorization.create_authorization(app, user, scopes),
 137          {:ok, token} <- Token.exchange_token(app, auth) do
 138       response = %{
 139         token_type: "Bearer",
 140         access_token: token.token,
 141         refresh_token: token.refresh_token,
 142         expires_in: 60 * 10,
 143         scope: Enum.join(token.scopes, " ")
 144       }
 145
 146       json(conn, response)
 147     else
 148       {:auth_active, false} ->
 149         conn
 150         |> put_status(:forbidden)
 151         |> json(%{error: "Account confirmation pending"})
 152
 153       _error ->
 154         put_status(conn, 400)
 155         |> json(%{error: "Invalid credentials"})
 156     end
 157   end
 158
 159   def token_exchange(
 160         conn,
 161         %{"grant_type" => "password", "name" => name, "password" => _password} = params
 162       ) do
 163     params =
 164       params
 165       |> Map.delete("name")
 166       |> Map.put("username", name)
 167
 168     token_exchange(conn, params)
 169   end
 170
 171   def token_revoke(conn, %{"token" => token} = params) do
 172     with %App{} = app <- get_app_from_request(conn, params),
 173          %Token{} = token <- Repo.get_by(Token, token: token, app_id: app.id),
 174          {:ok, %Token{}} <- Repo.delete(token) do
 175       json(conn, %{})
 176     else
 177       _error ->
 178         # RFC 7009: invalid tokens [in the request] do not cause an error response
 179         json(conn, %{})
 180     end
 181   end
 182
 183   # XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be
 184   # decoding it.  Investigate sometime.
 185   defp fix_padding(token) do
 186     token
 187     |> URI.decode()
 188     |> Base.url_decode64!(padding: false)
 189     |> Base.url_encode64(padding: false)
 190   end
 191
 192   defp get_app_from_request(conn, params) do
 193     # Per RFC 6749, HTTP Basic is preferred to body params
 194     {client_id, client_secret} =
 195       with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
 196            {:ok, decoded} <- Base.decode64(encoded),
 197            [id, secret] <-
 198              String.split(decoded, ":")
 199              |> Enum.map(fn s -> URI.decode_www_form(s) end) do
 200         {id, secret}
 201       else
 202         _ -> {params["client_id"], params["client_secret"]}
 203       end
 204
 205     if client_id && client_secret do
 206       Repo.get_by(
 207         App,
 208         client_id: client_id,
 209         client_secret: client_secret
 210       )
 211     else
 212       nil
 213     end
 214   end
 215 end