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468 lines
16 KiB
Elixir
468 lines
16 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.OAuth.OAuthController do
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use Pleroma.Web, :controller
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alias Pleroma.Helpers.UriHelper
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alias Pleroma.Registration
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alias Pleroma.Repo
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alias Pleroma.User
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alias Pleroma.Web.Auth.Authenticator
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alias Pleroma.Web.ControllerHelper
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alias Pleroma.Web.OAuth.App
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alias Pleroma.Web.OAuth.Authorization
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alias Pleroma.Web.OAuth.Token
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alias Pleroma.Web.OAuth.Token.Strategy.RefreshToken
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alias Pleroma.Web.OAuth.Token.Strategy.Revoke, as: RevokeToken
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alias Pleroma.Web.OAuth.Scopes
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require Logger
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if Pleroma.Config.oauth_consumer_enabled?(), do: plug(Ueberauth)
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plug(:fetch_session)
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plug(:fetch_flash)
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action_fallback(Pleroma.Web.OAuth.FallbackController)
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@oob_token_redirect_uri "urn:ietf:wg:oauth:2.0:oob"
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# Note: this definition is only called from error-handling methods with `conn.params` as 2nd arg
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def authorize(%Plug.Conn{} = conn, %{"authorization" => _} = params) do
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{auth_attrs, params} = Map.pop(params, "authorization")
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authorize(conn, Map.merge(params, auth_attrs))
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end
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def authorize(%Plug.Conn{assigns: %{token: %Token{}}} = conn, params) do
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if ControllerHelper.truthy_param?(params["force_login"]) do
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do_authorize(conn, params)
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else
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handle_existing_authorization(conn, params)
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end
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end
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def authorize(%Plug.Conn{} = conn, params), do: do_authorize(conn, params)
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defp do_authorize(%Plug.Conn{} = conn, params) do
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app = Repo.get_by(App, client_id: params["client_id"])
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available_scopes = (app && app.scopes) || []
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scopes = Scopes.fetch_scopes(params, available_scopes)
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# Note: `params` might differ from `conn.params`; use `@params` not `@conn.params` in template
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render(conn, Authenticator.auth_template(), %{
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response_type: params["response_type"],
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client_id: params["client_id"],
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available_scopes: available_scopes,
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scopes: scopes,
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redirect_uri: params["redirect_uri"],
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state: params["state"],
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params: params
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})
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end
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defp handle_existing_authorization(
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%Plug.Conn{assigns: %{token: %Token{} = token}} = conn,
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%{"redirect_uri" => @oob_token_redirect_uri}
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) do
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render(conn, "oob_token_exists.html", %{token: token})
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end
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defp handle_existing_authorization(
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%Plug.Conn{assigns: %{token: %Token{} = token}} = conn,
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%{} = params
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) do
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app = Repo.preload(token, :app).app
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redirect_uri =
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if is_binary(params["redirect_uri"]) do
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params["redirect_uri"]
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else
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default_redirect_uri(app)
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end
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if redirect_uri in String.split(app.redirect_uris) do
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redirect_uri = redirect_uri(conn, redirect_uri)
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url_params = %{access_token: token.token}
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url_params = UriHelper.append_param_if_present(url_params, :state, params["state"])
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url = UriHelper.append_uri_params(redirect_uri, url_params)
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redirect(conn, external: url)
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else
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conn
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|> put_flash(:error, dgettext("errors", "Unlisted redirect_uri."))
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|> redirect(external: redirect_uri(conn, redirect_uri))
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end
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end
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def create_authorization(
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%Plug.Conn{} = conn,
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%{"authorization" => _} = params,
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opts \\ []
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) do
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with {:ok, auth} <- do_create_authorization(conn, params, opts[:user]) do
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after_create_authorization(conn, auth, params)
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else
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error ->
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handle_create_authorization_error(conn, error, params)
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end
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end
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def after_create_authorization(%Plug.Conn{} = conn, %Authorization{} = auth, %{
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"authorization" => %{"redirect_uri" => @oob_token_redirect_uri}
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}) do
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render(conn, "oob_authorization_created.html", %{auth: auth})
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end
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def after_create_authorization(%Plug.Conn{} = conn, %Authorization{} = auth, %{
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"authorization" => %{"redirect_uri" => redirect_uri} = auth_attrs
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}) do
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app = Repo.preload(auth, :app).app
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# An extra safety measure before we redirect (also done in `do_create_authorization/2`)
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if redirect_uri in String.split(app.redirect_uris) do
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redirect_uri = redirect_uri(conn, redirect_uri)
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url_params = %{code: auth.token}
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url_params = UriHelper.append_param_if_present(url_params, :state, auth_attrs["state"])
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url = UriHelper.append_uri_params(redirect_uri, url_params)
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redirect(conn, external: url)
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else
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conn
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|> put_flash(:error, dgettext("errors", "Unlisted redirect_uri."))
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|> redirect(external: redirect_uri(conn, redirect_uri))
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end
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:error, scopes_issue},
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%{"authorization" => _} = params
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)
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when scopes_issue in [:unsupported_scopes, :missing_scopes] do
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# Per https://github.com/tootsuite/mastodon/blob/
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# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L39
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conn
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|> put_flash(:error, dgettext("errors", "This action is outside the authorized scopes"))
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|> put_status(:unauthorized)
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|> authorize(params)
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:auth_active, false},
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%{"authorization" => _} = params
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) do
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# Per https://github.com/tootsuite/mastodon/blob/
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# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
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conn
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|> put_flash(:error, dgettext("errors", "Your login is missing a confirmed e-mail address"))
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|> put_status(:forbidden)
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|> authorize(params)
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end
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defp handle_create_authorization_error(%Plug.Conn{} = conn, error, %{"authorization" => _}) do
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Authenticator.handle_error(conn, error)
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end
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@doc "Renew access_token with refresh_token"
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "refresh_token", "refresh_token" => token} = _params
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) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, %{user: user} = token} <- Token.get_by_refresh_token(app, token),
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{:ok, token} <- RefreshToken.grant(token) do
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response_attrs = %{created_at: Token.Utils.format_created_at(token)}
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json(conn, Token.Response.build(user, token, response_attrs))
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else
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_error -> render_invalid_credentials_error(conn)
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end
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end
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def token_exchange(%Plug.Conn{} = conn, %{"grant_type" => "authorization_code"} = params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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fixed_token = Token.Utils.fix_padding(params["code"]),
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{:ok, auth} <- Authorization.get_by_token(app, fixed_token),
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%User{} = user <- User.get_cached_by_id(auth.user_id),
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{:ok, token} <- Token.exchange_token(app, auth) do
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response_attrs = %{created_at: Token.Utils.format_created_at(token)}
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json(conn, Token.Response.build(user, token, response_attrs))
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else
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_error -> render_invalid_credentials_error(conn)
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end
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end
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "password"} = params
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) do
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with {:ok, %User{} = user} <- Authenticator.get_user(conn),
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{:ok, app} <- Token.Utils.fetch_app(conn),
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{:auth_active, true} <- {:auth_active, User.auth_active?(user)},
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{:user_active, true} <- {:user_active, !user.info.deactivated},
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{:ok, scopes} <- validate_scopes(app, params),
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{:ok, auth} <- Authorization.create_authorization(app, user, scopes),
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{:ok, token} <- Token.exchange_token(app, auth) do
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json(conn, Token.Response.build(user, token))
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else
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{:auth_active, false} ->
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# Per https://github.com/tootsuite/mastodon/blob/
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# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L76
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render_error(conn, :forbidden, "Your login is missing a confirmed e-mail address")
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{:user_active, false} ->
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render_error(conn, :forbidden, "Your account is currently disabled")
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_error ->
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render_invalid_credentials_error(conn)
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end
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end
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "password", "name" => name, "password" => _password} = params
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) do
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params =
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params
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|> Map.delete("name")
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|> Map.put("username", name)
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token_exchange(conn, params)
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end
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def token_exchange(%Plug.Conn{} = conn, %{"grant_type" => "client_credentials"} = _params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, auth} <- Authorization.create_authorization(app, %User{}),
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{:ok, token} <- Token.exchange_token(app, auth) do
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json(conn, Token.Response.build_for_client_credentials(token))
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else
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_error -> render_invalid_credentials_error(conn)
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end
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end
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# Bad request
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def token_exchange(%Plug.Conn{} = conn, params), do: bad_request(conn, params)
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def token_revoke(%Plug.Conn{} = conn, %{"token" => _token} = params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, _token} <- RevokeToken.revoke(app, params) do
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json(conn, %{})
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else
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_error ->
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# RFC 7009: invalid tokens [in the request] do not cause an error response
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json(conn, %{})
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end
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end
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def token_revoke(%Plug.Conn{} = conn, params), do: bad_request(conn, params)
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# Response for bad request
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defp bad_request(%Plug.Conn{} = conn, _) do
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render_error(conn, :internal_server_error, "Bad request")
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end
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@doc "Prepares OAuth request to provider for Ueberauth"
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def prepare_request(%Plug.Conn{} = conn, %{
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"provider" => provider,
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"authorization" => auth_attrs
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}) do
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scope =
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auth_attrs
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|> Scopes.fetch_scopes([])
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|> Scopes.to_string()
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state =
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auth_attrs
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|> Map.delete("scopes")
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|> Map.put("scope", scope)
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|> Jason.encode!()
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params =
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auth_attrs
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|> Map.drop(~w(scope scopes client_id redirect_uri))
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|> Map.put("state", state)
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# Handing the request to Ueberauth
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redirect(conn, to: o_auth_path(conn, :request, provider, params))
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end
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def request(%Plug.Conn{} = conn, params) do
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message =
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if params["provider"] do
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dgettext("errors", "Unsupported OAuth provider: %{provider}.",
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provider: params["provider"]
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)
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else
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dgettext("errors", "Bad OAuth request.")
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end
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conn
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|> put_flash(:error, message)
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|> redirect(to: "/")
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end
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def callback(%Plug.Conn{assigns: %{ueberauth_failure: failure}} = conn, params) do
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params = callback_params(params)
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messages = for e <- Map.get(failure, :errors, []), do: e.message
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message = Enum.join(messages, "; ")
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conn
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|> put_flash(
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:error,
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dgettext("errors", "Failed to authenticate: %{message}.", message: message)
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)
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|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
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end
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def callback(%Plug.Conn{} = conn, params) do
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params = callback_params(params)
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with {:ok, registration} <- Authenticator.get_registration(conn) do
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auth_attrs = Map.take(params, ~w(client_id redirect_uri scope scopes state))
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case Repo.get_assoc(registration, :user) do
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{:ok, user} ->
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create_authorization(conn, %{"authorization" => auth_attrs}, user: user)
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_ ->
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registration_params =
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Map.merge(auth_attrs, %{
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"nickname" => Registration.nickname(registration),
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"email" => Registration.email(registration)
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})
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conn
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|> put_session_registration_id(registration.id)
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|> registration_details(%{"authorization" => registration_params})
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end
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else
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error ->
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Logger.debug(inspect(["OAUTH_ERROR", error, conn.assigns]))
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conn
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|> put_flash(:error, dgettext("errors", "Failed to set up user account."))
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|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
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end
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end
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defp callback_params(%{"state" => state} = params) do
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Map.merge(params, Jason.decode!(state))
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end
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def registration_details(%Plug.Conn{} = conn, %{"authorization" => auth_attrs}) do
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render(conn, "register.html", %{
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client_id: auth_attrs["client_id"],
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redirect_uri: auth_attrs["redirect_uri"],
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state: auth_attrs["state"],
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scopes: Scopes.fetch_scopes(auth_attrs, []),
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nickname: auth_attrs["nickname"],
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email: auth_attrs["email"]
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})
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end
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def register(%Plug.Conn{} = conn, %{"authorization" => _, "op" => "connect"} = params) do
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with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
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%Registration{} = registration <- Repo.get(Registration, registration_id),
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{_, {:ok, auth}} <-
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{:create_authorization, do_create_authorization(conn, params)},
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%User{} = user <- Repo.preload(auth, :user).user,
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{:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
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conn
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|> put_session_registration_id(nil)
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|> after_create_authorization(auth, params)
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else
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{:create_authorization, error} ->
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{:register, handle_create_authorization_error(conn, error, params)}
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_ ->
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{:register, :generic_error}
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end
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end
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def register(%Plug.Conn{} = conn, %{"authorization" => _, "op" => "register"} = params) do
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with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
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%Registration{} = registration <- Repo.get(Registration, registration_id),
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{:ok, user} <- Authenticator.create_from_registration(conn, registration) do
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conn
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|> put_session_registration_id(nil)
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|> create_authorization(
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params,
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user: user
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)
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else
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{:error, changeset} ->
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message =
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Enum.map(changeset.errors, fn {field, {error, _}} ->
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"#{field} #{error}"
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end)
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|> Enum.join("; ")
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message =
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String.replace(
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message,
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"ap_id has already been taken",
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"nickname has already been taken"
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)
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conn
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|> put_status(:forbidden)
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|> put_flash(:error, "Error: #{message}.")
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|> registration_details(params)
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_ ->
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{:register, :generic_error}
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end
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end
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defp do_create_authorization(
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%Plug.Conn{} = conn,
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%{
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"authorization" =>
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%{
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"client_id" => client_id,
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"redirect_uri" => redirect_uri
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} = auth_attrs
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},
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user \\ nil
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) do
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with {_, {:ok, %User{} = user}} <-
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{:get_user, (user && {:ok, user}) || Authenticator.get_user(conn)},
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%App{} = app <- Repo.get_by(App, client_id: client_id),
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true <- redirect_uri in String.split(app.redirect_uris),
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{:ok, scopes} <- validate_scopes(app, auth_attrs),
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{:auth_active, true} <- {:auth_active, User.auth_active?(user)} do
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Authorization.create_authorization(app, user, scopes)
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end
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end
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# Special case: Local MastodonFE
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defp redirect_uri(%Plug.Conn{} = conn, "."), do: mastodon_api_url(conn, :login)
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defp redirect_uri(%Plug.Conn{}, redirect_uri), do: redirect_uri
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defp get_session_registration_id(%Plug.Conn{} = conn), do: get_session(conn, :registration_id)
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defp put_session_registration_id(%Plug.Conn{} = conn, registration_id),
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do: put_session(conn, :registration_id, registration_id)
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@spec validate_scopes(App.t(), map()) ::
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{:ok, list()} | {:error, :missing_scopes | :unsupported_scopes}
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defp validate_scopes(app, params) do
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params
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|> Scopes.fetch_scopes(app.scopes)
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|> Scopes.validates(app.scopes)
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end
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def default_redirect_uri(%App{} = app) do
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app.redirect_uris
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|> String.split()
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|> Enum.at(0)
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end
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defp render_invalid_credentials_error(conn) do
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render_error(conn, :bad_request, "Invalid credentials")
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end
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end
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