package main import ( "net/http" "strings" "github.com/GeertJohan/yubigo" "github.com/Luzifer/go_helpers/str" yaml "gopkg.in/yaml.v2" ) func init() { registerAuthenticator(&authYubikey{}) } type authYubikey struct { ClientID string `yaml:"client_id"` SecretKey string `yaml:"secret_key"` Devices map[string]string `yaml:"devices"` Groups map[string][]string `yaml:"groups"` } // AuthenticatorID needs to return an unique string to identify // this special authenticator func (a authYubikey) AuthenticatorID() string { return "yubikey" } // Configure loads the configuration for the Authenticator from the // global config.yaml file which is passed as a byte-slice. // If no configuration for the Authenticator is supplied the function // needs to return the errAuthenticatorUnconfigured func (a *authYubikey) Configure(yamlSource []byte) error { envelope := struct { Providers struct { Yubikey *authYubikey `yaml:"yubikey"` } `yaml:"providers"` }{} if err := yaml.Unmarshal(yamlSource, &envelope); err != nil { return err } if envelope.Providers.Yubikey == nil { return errAuthenticatorUnconfigured } a.ClientID = envelope.Providers.Yubikey.ClientID a.SecretKey = envelope.Providers.Yubikey.SecretKey a.Devices = envelope.Providers.Yubikey.Devices a.Groups = envelope.Providers.Yubikey.Groups return nil } // DetectUser is used to detect a user without a login form from // a cookie, header or other methods // If no user was detected the errNoValidUserFound needs to be // returned func (a authYubikey) DetectUser(r *http.Request) (string, []string, error) { sess, err := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-")) if err != nil { return "", nil, errNoValidUserFound } user, ok := sess.Values["user"].(string) if !ok { return "", nil, errNoValidUserFound } groups := []string{} for group, users := range a.Groups { if str.StringInSlice(user, users) { groups = append(groups, group) } } return user, groups, nil } // Login is called when the user submits the login form and needs // to authenticate the user or throw an error. If the user has // successfully logged in the persistent cookie should be written // in order to use DetectUser for the next login. // If the user did not login correctly the errNoValidUserFound // needs to be returned func (a authYubikey) Login(res http.ResponseWriter, r *http.Request) error { keyInput := r.FormValue(strings.Join([]string{a.AuthenticatorID(), "key-input"}, "-")) yubiAuth, err := yubigo.NewYubiAuth(a.ClientID, a.SecretKey) if err != nil { return err } _, ok, err := yubiAuth.Verify(keyInput) if err != nil { return err } if !ok { // Not a valid authentication return errNoValidUserFound } user, ok := a.Devices[keyInput[:12]] if !ok { // We do not have a definition for that key return errNoValidUserFound } sess, _ := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-")) sess.Options = mainCfg.GetSessionOpts() sess.Values["user"] = user return sess.Save(r, res) } // LoginFields needs to return the fields required for this login // method. If no login using this method is possible the function // needs to return nil. func (a authYubikey) LoginFields() (fields []loginField) { return []loginField{ { Label: "Yubikey One-Time-Password", Name: "key-input", Placeholder: "Press the button of your Yubikey...", Type: "text", }, } } // Logout is called when the user visits the logout endpoint and // needs to destroy any persistent stored cookies func (a authYubikey) Logout(res http.ResponseWriter, r *http.Request) (err error) { sess, _ := cookieStore.Get(r, strings.Join([]string{mainCfg.Cookie.Prefix, a.AuthenticatorID()}, "-")) sess.Options = mainCfg.GetSessionOpts() sess.Options.MaxAge = -1 // Instant delete return sess.Save(r, res) }