255 lines
8.5 KiB
Ruby
255 lines
8.5 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
# Guard API with OAuth 2.0 Access Token
|
|
|
|
require 'rack/oauth2'
|
|
|
|
module API
|
|
module APIGuard
|
|
extend ActiveSupport::Concern
|
|
include Gitlab::Utils::StrongMemoize
|
|
|
|
included do |base|
|
|
# OAuth2 Resource Server Authentication
|
|
use Rack::OAuth2::Server::Resource::Bearer, 'The API' do |request|
|
|
# The authenticator only fetches the raw token string
|
|
|
|
# Must yield access token to store it in the env
|
|
request.access_token
|
|
end
|
|
|
|
use AdminModeMiddleware
|
|
use ResponseCoercerMiddleware
|
|
|
|
helpers HelperMethods
|
|
|
|
install_error_responders(base)
|
|
end
|
|
|
|
class_methods do
|
|
# Set the authorization scope(s) allowed for an API endpoint.
|
|
#
|
|
# A call to this method maps the given scope(s) to the current API
|
|
# endpoint class. If this method is called multiple times on the same class,
|
|
# the scopes are all aggregated.
|
|
def allow_access_with_scope(scopes, options = {})
|
|
Array(scopes).each do |scope|
|
|
allowed_scopes << Scope.new(scope, options)
|
|
end
|
|
end
|
|
|
|
def allowed_scopes
|
|
@scopes ||= []
|
|
end
|
|
end
|
|
|
|
# Helper Methods for Grape Endpoint
|
|
module HelperMethods
|
|
include Gitlab::Auth::AuthFinders
|
|
|
|
def access_token
|
|
strong_memoize(:api_guard_access_token) do
|
|
super || find_personal_access_token_from_http_basic_auth
|
|
end
|
|
end
|
|
|
|
def find_current_user!
|
|
user = find_user_from_sources
|
|
return unless user
|
|
|
|
Gitlab::Auth::CurrentUserMode.bypass_session!(user.id) if bypass_session_for_admin_mode?(user)
|
|
|
|
unless api_access_allowed?(user)
|
|
forbidden!(api_access_denied_message(user))
|
|
end
|
|
|
|
user
|
|
end
|
|
|
|
def find_user_from_sources
|
|
strong_memoize(:find_user_from_sources) do
|
|
if try(:namespace_inheritable, :authentication)
|
|
user_from_namespace_inheritable ||
|
|
user_from_warden
|
|
else
|
|
deploy_token_from_request ||
|
|
find_user_from_bearer_token ||
|
|
find_user_from_job_token ||
|
|
user_from_warden
|
|
end
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def bypass_session_for_admin_mode?(user)
|
|
return user.is_a?(User) && Gitlab::CurrentSettings.admin_mode if Feature.disabled?(:admin_mode_for_api)
|
|
|
|
return false unless Gitlab::CurrentSettings.admin_mode
|
|
return false unless user.is_a?(User)
|
|
|
|
Gitlab::Session.with_session(current_request.session) { Gitlab::Auth::CurrentUserMode.new(user).admin_mode? } ||
|
|
Gitlab::Auth::RequestAuthenticator.new(current_request).valid_access_token?(scopes: [:admin_mode])
|
|
end
|
|
|
|
# An array of scopes that were registered (using `allow_access_with_scope`)
|
|
# for the current endpoint class. It also returns scopes registered on
|
|
# `API::API`, since these are meant to apply to all API routes.
|
|
def scopes_registered_for_endpoint
|
|
@scopes_registered_for_endpoint ||=
|
|
begin
|
|
endpoint_classes = [options[:for].presence, ::API::API].compact
|
|
endpoint_classes.reduce([]) do |memo, endpoint|
|
|
if endpoint.respond_to?(:allowed_scopes)
|
|
memo.concat(endpoint.allowed_scopes)
|
|
else
|
|
memo
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
def api_access_allowed?(user)
|
|
user_allowed_or_deploy_token?(user) && user.can?(:access_api)
|
|
end
|
|
|
|
def api_access_denied_message(user)
|
|
Gitlab::Auth::UserAccessDeniedReason.new(user).rejection_message
|
|
end
|
|
|
|
def user_allowed_or_deploy_token?(user)
|
|
Gitlab::UserAccess.new(user).allowed? || user.is_a?(DeployToken)
|
|
end
|
|
|
|
def user_from_warden
|
|
user = find_user_from_warden
|
|
|
|
return unless user
|
|
return if two_factor_required_but_not_setup?(user)
|
|
|
|
user
|
|
end
|
|
|
|
def two_factor_required_but_not_setup?(user)
|
|
verifier = Gitlab::Auth::TwoFactorAuthVerifier.new(user)
|
|
|
|
if verifier.two_factor_authentication_required? && verifier.current_user_needs_to_setup_two_factor?
|
|
verifier.two_factor_grace_period_expired?
|
|
else
|
|
false
|
|
end
|
|
end
|
|
end
|
|
|
|
class_methods do
|
|
private
|
|
|
|
def install_error_responders(base)
|
|
error_classes = [Gitlab::Auth::MissingTokenError,
|
|
Gitlab::Auth::TokenNotFoundError,
|
|
Gitlab::Auth::ExpiredError,
|
|
Gitlab::Auth::RevokedError,
|
|
Gitlab::Auth::ImpersonationDisabled,
|
|
Gitlab::Auth::InsufficientScopeError]
|
|
|
|
base.__send__(:rescue_from, *error_classes, oauth2_bearer_token_error_handler) # rubocop:disable GitlabSecurity/PublicSend
|
|
end
|
|
|
|
def oauth2_bearer_token_error_handler
|
|
proc do |e|
|
|
response =
|
|
case e
|
|
when Gitlab::Auth::MissingTokenError
|
|
Rack::OAuth2::Server::Resource::Bearer::Unauthorized.new
|
|
|
|
when Gitlab::Auth::TokenNotFoundError
|
|
Rack::OAuth2::Server::Resource::Bearer::Unauthorized.new(
|
|
:invalid_token,
|
|
"Bad Access Token.")
|
|
|
|
when Gitlab::Auth::ExpiredError
|
|
Rack::OAuth2::Server::Resource::Bearer::Unauthorized.new(
|
|
:invalid_token,
|
|
"Token is expired. You can either do re-authorization or token refresh.")
|
|
|
|
when Gitlab::Auth::RevokedError
|
|
Rack::OAuth2::Server::Resource::Bearer::Unauthorized.new(
|
|
:invalid_token,
|
|
"Token was revoked. You have to re-authorize from the user.")
|
|
|
|
when Gitlab::Auth::ImpersonationDisabled
|
|
Rack::OAuth2::Server::Resource::Bearer::Unauthorized.new(
|
|
:invalid_token,
|
|
"Token is an impersonation token but impersonation was disabled.")
|
|
|
|
when Gitlab::Auth::InsufficientScopeError
|
|
# FIXME: ForbiddenError (inherited from Bearer::Forbidden of Rack::Oauth2)
|
|
# does not include WWW-Authenticate header, which breaks the standard.
|
|
Rack::OAuth2::Server::Resource::Bearer::Forbidden.new(
|
|
:insufficient_scope,
|
|
Rack::OAuth2::Server::Resource::ErrorMethods::DEFAULT_DESCRIPTION[:insufficient_scope],
|
|
{ scope: e.scopes })
|
|
end
|
|
|
|
status, headers, body = response.finish
|
|
|
|
# Grape expects a Rack::Response
|
|
# (https://github.com/ruby-grape/grape/commit/c117bff7d22971675f4b34367d3a98bc31c8fc02),
|
|
# so we need to recreate the response again even though
|
|
# response.finish already does this.
|
|
# (https://github.com/nov/rack-oauth2/blob/40c9a99fd80486ccb8de0e4869ae384547c0d703/lib/rack/oauth2/server/abstract/error.rb#L26).
|
|
Rack::Response.new(body, status, headers)
|
|
end
|
|
end
|
|
end
|
|
|
|
# Prior to Rack v2.1.x, returning a body of [nil] or [201] worked
|
|
# because the body was coerced to a string. However, this no longer
|
|
# works in Rack v2.1.0+. The Rack spec
|
|
# (https://github.com/rack/rack/blob/master/SPEC.rdoc#the-body-)
|
|
# says:
|
|
#
|
|
# The Body must respond to `each` and must only yield String values
|
|
#
|
|
# Because it's easy to return the wrong body type, this middleware
|
|
# will:
|
|
#
|
|
# 1. Inspect each element of the body if it is an Array.
|
|
# 2. Coerce each value to a string if necessary.
|
|
# 3. Flag a test and development error.
|
|
class ResponseCoercerMiddleware < ::Grape::Middleware::Base
|
|
def call(env)
|
|
response = super(env)
|
|
|
|
status = response[0]
|
|
body = response[2]
|
|
|
|
return response if Rack::Utils::STATUS_WITH_NO_ENTITY_BODY[status]
|
|
return response unless body.is_a?(Array)
|
|
|
|
body.map! do |part|
|
|
if part.is_a?(String)
|
|
part
|
|
else
|
|
err = ArgumentError.new("The response body should be a String, but it is of type #{part.class}")
|
|
Gitlab::ErrorTracking.track_and_raise_for_dev_exception(err)
|
|
part.to_s
|
|
end
|
|
end
|
|
|
|
response
|
|
end
|
|
end
|
|
|
|
class AdminModeMiddleware < ::Grape::Middleware::Base
|
|
def after
|
|
# Use a Grape middleware since the Grape `after` blocks might run
|
|
# before we are finished rendering the `Grape::Entity` classes
|
|
Gitlab::Auth::CurrentUserMode.reset_bypass_session! if Gitlab::CurrentSettings.admin_mode
|
|
|
|
# Explicit nil is needed or the api call return value will be overwritten
|
|
nil
|
|
end
|
|
end
|
|
end
|
|
end
|