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