package authorization import ( "sync" "github.com/docker/docker/pkg/plugingetter" "github.com/docker/docker/pkg/plugins" ) // Plugin allows third party plugins to authorize requests and responses // in the context of docker API type Plugin interface { // Name returns the registered plugin name Name() string // AuthZRequest authorizes the request from the client to the daemon AuthZRequest(*Request) (*Response, error) // AuthZResponse authorizes the response from the daemon to the client AuthZResponse(*Request) (*Response, error) } // newPlugins constructs and initializes the authorization plugins based on plugin names func newPlugins(names []string) []Plugin { plugins := []Plugin{} pluginsMap := make(map[string]struct{}) for _, name := range names { if _, ok := pluginsMap[name]; ok { continue } pluginsMap[name] = struct{}{} plugins = append(plugins, newAuthorizationPlugin(name)) } return plugins } var getter plugingetter.PluginGetter // SetPluginGetter sets the plugingetter func SetPluginGetter(pg plugingetter.PluginGetter) { getter = pg } // GetPluginGetter gets the plugingetter func GetPluginGetter() plugingetter.PluginGetter { return getter } // authorizationPlugin is an internal adapter to docker plugin system type authorizationPlugin struct { plugin *plugins.Client name string once sync.Once } func newAuthorizationPlugin(name string) Plugin { return &authorizationPlugin{name: name} } func (a *authorizationPlugin) Name() string { return a.name } func (a *authorizationPlugin) AuthZRequest(authReq *Request) (*Response, error) { if err := a.initPlugin(); err != nil { return nil, err } authRes := &Response{} if err := a.plugin.Call(AuthZApiRequest, authReq, authRes); err != nil { return nil, err } return authRes, nil } func (a *authorizationPlugin) AuthZResponse(authReq *Request) (*Response, error) { if err := a.initPlugin(); err != nil { return nil, err } authRes := &Response{} if err := a.plugin.Call(AuthZApiResponse, authReq, authRes); err != nil { return nil, err } return authRes, nil } // initPlugin initializes the authorization plugin if needed func (a *authorizationPlugin) initPlugin() error { // Lazy loading of plugins var err error a.once.Do(func() { if a.plugin == nil { var plugin plugingetter.CompatPlugin var e error if pg := GetPluginGetter(); pg != nil { plugin, e = pg.Get(a.name, AuthZApiImplements, plugingetter.LOOKUP) } else { plugin, e = plugins.Get(a.name, AuthZApiImplements) } if e != nil { err = e return } a.plugin = plugin.Client() } }) return err }