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