144 lines
4.6 KiB
Ruby
144 lines
4.6 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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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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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::UserAuthFinders
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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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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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find_user_from_access_token || find_user_from_warden
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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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Gitlab::UserAccess.new(user).allowed? && 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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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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response.finish
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end
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end
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end
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end
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end
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