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 Comeonin.Pbkdf2
   9   alias Pleroma.Repo
  10   alias Pleroma.User
  11   alias Pleroma.Web.Auth.Authenticator
  12   alias Pleroma.Web.OAuth.App
  13   alias Pleroma.Web.OAuth.Authorization
  14   alias Pleroma.Web.OAuth.Token
  15
  16   import Pleroma.Web.ControllerHelper, only: [oauth_scopes: 2]
  17
  18   plug(:fetch_session)
  19   plug(:fetch_flash)
  20
  21   action_fallback(Pleroma.Web.OAuth.FallbackController)
  22
  23   def authorize(conn, params) do
  24     app = Repo.get_by(App, client_id: params["client_id"])
  25     available_scopes = (app && app.scopes) || []
  26     scopes = oauth_scopes(params, nil) || available_scopes
  27
  28     render(conn, Authenticator.auth_template(), %{
  29       response_type: params["response_type"],
  30       client_id: params["client_id"],
  31       available_scopes: available_scopes,
  32       scopes: scopes,
  33       redirect_uri: params["redirect_uri"],
  34       state: params["state"],
  35       params: params
  36     })
  37   end
  38
  39   def create_authorization(conn, %{
  40         "authorization" =>
  41           %{
  42             "client_id" => client_id,
  43             "redirect_uri" => redirect_uri
  44           } = auth_params
  45       }) do
  46     with {_, {:ok, %User{} = user}} <- {:get_user, Authenticator.get_user(conn)},
  47          %App{} = app <- Repo.get_by(App, client_id: client_id),
  48          true <- redirect_uri in String.split(app.redirect_uris),
  49          scopes <- oauth_scopes(auth_params, []),
  50          {:unsupported_scopes, []} <- {:unsupported_scopes, scopes -- app.scopes},
  51          # Note: `scope` param is intentionally not optional in this context
  52          {:missing_scopes, false} <- {:missing_scopes, scopes == []},
  53          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
  54          {:ok, auth} <- Authorization.create_authorization(app, user, scopes) do
  55       redirect_uri =
  56         if redirect_uri == "." do
  57           # Special case: Local MastodonFE
  58           mastodon_api_url(conn, :login)
  59         else
  60           redirect_uri
  61         end
  62
  63       cond do
  64         redirect_uri == "urn:ietf:wg:oauth:2.0:oob" ->
  65           render(conn, "results.html", %{
  66             auth: auth
  67           })
  68
  69         true ->
  70           connector = if String.contains?(redirect_uri, "?"), do: "&", else: "?"
  71           url = "#{redirect_uri}#{connector}"
  72           url_params = %{:code => auth.token}
  73
  74           url_params =
  75             if auth_params["state"] do
  76               Map.put(url_params, :state, auth_params["state"])
  77             else
  78               url_params
  79             end
  80
  81           url = "#{url}#{Plug.Conn.Query.encode(url_params)}"
  82
  83           redirect(conn, external: url)
  84       end
  85     else
  86       {scopes_issue, _} when scopes_issue in [:unsupported_scopes, :missing_scopes] ->
  87         conn
  88         |> put_flash(:error, "Permissions not specified.")
  89         |> put_status(:unauthorized)
  90         |> authorize(auth_params)
  91
  92       {:auth_active, false} ->
  93         conn
  94         |> put_flash(:error, "Account confirmation pending.")
  95         |> put_status(:forbidden)
  96         |> authorize(auth_params)
  97
  98       error ->
  99         Authenticator.handle_error(conn, error)
 100     end
 101   end
 102
 103   def token_exchange(conn, %{"grant_type" => "authorization_code"} = params) do
 104     with %App{} = app <- get_app_from_request(conn, params),
 105          fixed_token = fix_padding(params["code"]),
 106          %Authorization{} = auth <-
 107            Repo.get_by(Authorization, token: fixed_token, app_id: app.id),
 108          {:ok, token} <- Token.exchange_token(app, auth),
 109          {:ok, inserted_at} <- DateTime.from_naive(token.inserted_at, "Etc/UTC") do
 110       response = %{
 111         token_type: "Bearer",
 112         access_token: token.token,
 113         refresh_token: token.refresh_token,
 114         created_at: DateTime.to_unix(inserted_at),
 115         expires_in: 60 * 10,
 116         scope: Enum.join(token.scopes, " ")
 117       }
 118
 119       json(conn, response)
 120     else
 121       _error ->
 122         put_status(conn, 400)
 123         |> json(%{error: "Invalid credentials"})
 124     end
 125   end
 126
 127   def token_exchange(
 128         conn,
 129         %{"grant_type" => "password", "username" => name, "password" => password} = params
 130       ) do
 131     with %App{} = app <- get_app_from_request(conn, params),
 132          %User{} = user <- User.get_by_nickname_or_email(name),
 133          true <- Pbkdf2.checkpw(password, user.password_hash),
 134          {:auth_active, true} <- {:auth_active, User.auth_active?(user)},
 135          scopes <- oauth_scopes(params, app.scopes),
 136          [] <- scopes -- app.scopes,
 137          true <- Enum.any?(scopes),
 138          {:ok, auth} <- Authorization.create_authorization(app, user, scopes),
 139          {:ok, token} <- Token.exchange_token(app, auth) do
 140       response = %{
 141         token_type: "Bearer",
 142         access_token: token.token,
 143         refresh_token: token.refresh_token,
 144         expires_in: 60 * 10,
 145         scope: Enum.join(token.scopes, " ")
 146       }
 147
 148       json(conn, response)
 149     else
 150       {:auth_active, false} ->
 151         conn
 152         |> put_status(:forbidden)
 153         |> json(%{error: "Account confirmation pending"})
 154
 155       _error ->
 156         put_status(conn, 400)
 157         |> json(%{error: "Invalid credentials"})
 158     end
 159   end
 160
 161   def token_exchange(
 162         conn,
 163         %{"grant_type" => "password", "name" => name, "password" => _password} = params
 164       ) do
 165     params =
 166       params
 167       |> Map.delete("name")
 168       |> Map.put("username", name)
 169
 170     token_exchange(conn, params)
 171   end
 172
 173   def token_revoke(conn, %{"token" => token} = params) do
 174     with %App{} = app <- get_app_from_request(conn, params),
 175          %Token{} = token <- Repo.get_by(Token, token: token, app_id: app.id),
 176          {:ok, %Token{}} <- Repo.delete(token) do
 177       json(conn, %{})
 178     else
 179       _error ->
 180         # RFC 7009: invalid tokens [in the request] do not cause an error response
 181         json(conn, %{})
 182     end
 183   end
 184
 185   # XXX - for whatever reason our token arrives urlencoded, but Plug.Conn should be
 186   # decoding it.  Investigate sometime.
 187   defp fix_padding(token) do
 188     token
 189     |> URI.decode()
 190     |> Base.url_decode64!(padding: false)
 191     |> Base.url_encode64(padding: false)
 192   end
 193
 194   defp get_app_from_request(conn, params) do
 195     # Per RFC 6749, HTTP Basic is preferred to body params
 196     {client_id, client_secret} =
 197       with ["Basic " <> encoded] <- get_req_header(conn, "authorization"),
 198            {:ok, decoded} <- Base.decode64(encoded),
 199            [id, secret] <-
 200              String.split(decoded, ":")
 201              |> Enum.map(fn s -> URI.decode_www_form(s) end) do
 202         {id, secret}
 203       else
 204         _ -> {params["client_id"], params["client_secret"]}
 205       end
 206
 207     if client_id && client_secret do
 208       Repo.get_by(
 209         App,
 210         client_id: client_id,
 211         client_secret: client_secret
 212       )
 213     else
 214       nil
 215     end
 216   end
 217 end