package headscale import ( "errors" "fmt" "regexp" "strconv" "strings" "time" v1 "github.com/juanfont/headscale/gen/go/headscale/v1" "github.com/rs/zerolog/log" "google.golang.org/protobuf/types/known/timestamppb" "gorm.io/gorm" "tailscale.com/tailcfg" ) const ( errNamespaceExists = Error("Namespace already exists") errNamespaceNotFound = Error("Namespace not found") errNamespaceNotEmptyOfNodes = Error("Namespace not empty: node(s) found") errInvalidNamespaceName = Error("Invalid namespace name") ) const ( // value related to RFC 1123 and 952. labelHostnameLength = 63 ) var invalidCharsInNamespaceRegex = regexp.MustCompile("[^a-z0-9-.]+") // Namespace is the way Headscale implements the concept of users in Tailscale // // At the end of the day, users in Tailscale are some kind of 'bubbles' or namespaces // that contain our machines. type Namespace struct { gorm.Model Name string `gorm:"unique"` } // CreateNamespace creates a new Namespace. Returns error if could not be created // or another namespace already exists. func (h *Headscale) CreateNamespace(name string) (*Namespace, error) { err := CheckForFQDNRules(name) if err != nil { return nil, err } namespace := Namespace{} if err := h.db.Where("name = ?", name).First(&namespace).Error; err == nil { return nil, errNamespaceExists } namespace.Name = name if err := h.db.Create(&namespace).Error; err != nil { log.Error(). Str("func", "CreateNamespace"). Err(err). Msg("Could not create row") return nil, err } return &namespace, nil } // DestroyNamespace destroys a Namespace. Returns error if the Namespace does // not exist or if there are machines associated with it. func (h *Headscale) DestroyNamespace(name string) error { namespace, err := h.GetNamespace(name) if err != nil { return errNamespaceNotFound } machines, err := h.ListMachinesInNamespace(name) if err != nil { return err } if len(machines) > 0 { return errNamespaceNotEmptyOfNodes } keys, err := h.ListPreAuthKeys(name) if err != nil { return err } for _, key := range keys { err = h.DestroyPreAuthKey(key) if err != nil { return err } } if result := h.db.Unscoped().Delete(&namespace); result.Error != nil { return result.Error } return nil } // RenameNamespace renames a Namespace. Returns error if the Namespace does // not exist or if another Namespace exists with the new name. func (h *Headscale) RenameNamespace(oldName, newName string) error { var err error oldNamespace, err := h.GetNamespace(oldName) if err != nil { return err } err = CheckForFQDNRules(newName) if err != nil { return err } _, err = h.GetNamespace(newName) if err == nil { return errNamespaceExists } if !errors.Is(err, errNamespaceNotFound) { return err } oldNamespace.Name = newName if result := h.db.Save(&oldNamespace); result.Error != nil { return result.Error } return nil } // GetNamespace fetches a namespace by name. func (h *Headscale) GetNamespace(name string) (*Namespace, error) { namespace := Namespace{} if result := h.db.First(&namespace, "name = ?", name); errors.Is( result.Error, gorm.ErrRecordNotFound, ) { return nil, errNamespaceNotFound } return &namespace, nil } // ListNamespaces gets all the existing namespaces. func (h *Headscale) ListNamespaces() ([]Namespace, error) { namespaces := []Namespace{} if err := h.db.Find(&namespaces).Error; err != nil { return nil, err } return namespaces, nil } func (h *Headscale) ListNamespacesStr() ([]string, error) { namespaces, err := h.ListNamespaces() if err != nil { return []string{}, err } namespaceStrs := make([]string, len(namespaces)) for index, namespace := range namespaces { namespaceStrs[index] = namespace.Name } return namespaceStrs, nil } // ListMachinesInNamespace gets all the nodes in a given namespace. func (h *Headscale) ListMachinesInNamespace(name string) ([]Machine, error) { err := CheckForFQDNRules(name) if err != nil { return nil, err } namespace, err := h.GetNamespace(name) if err != nil { return nil, err } machines := []Machine{} if err := h.db.Preload("AuthKey").Preload("AuthKey.Namespace").Preload("Namespace").Where(&Machine{NamespaceID: namespace.ID}).Find(&machines).Error; err != nil { return nil, err } return machines, nil } // SetMachineNamespace assigns a Machine to a namespace. func (h *Headscale) SetMachineNamespace(machine *Machine, namespaceName string) error { err := CheckForFQDNRules(namespaceName) if err != nil { return err } namespace, err := h.GetNamespace(namespaceName) if err != nil { return err } machine.Namespace = *namespace if result := h.db.Save(&machine); result.Error != nil { return result.Error } return nil } func (n *Namespace) toUser() *tailcfg.User { user := tailcfg.User{ ID: tailcfg.UserID(n.ID), LoginName: n.Name, DisplayName: n.Name, ProfilePicURL: "", Domain: "headscale.net", Logins: []tailcfg.LoginID{}, Created: time.Time{}, } return &user } func (n *Namespace) toLogin() *tailcfg.Login { login := tailcfg.Login{ ID: tailcfg.LoginID(n.ID), LoginName: n.Name, DisplayName: n.Name, ProfilePicURL: "", Domain: "headscale.net", } return &login } func getMapResponseUserProfiles(machine Machine, peers Machines) []tailcfg.UserProfile { namespaceMap := make(map[string]Namespace) namespaceMap[machine.Namespace.Name] = machine.Namespace for _, peer := range peers { namespaceMap[peer.Namespace.Name] = peer.Namespace // not worth checking if already is there } profiles := []tailcfg.UserProfile{} for _, namespace := range namespaceMap { profiles = append(profiles, tailcfg.UserProfile{ ID: tailcfg.UserID(namespace.ID), LoginName: namespace.Name, DisplayName: namespace.Name, }) } return profiles } func (n *Namespace) toProto() *v1.Namespace { return &v1.Namespace{ Id: strconv.FormatUint(uint64(n.ID), Base10), Name: n.Name, CreatedAt: timestamppb.New(n.CreatedAt), } } // NormalizeToFQDNRules will replace forbidden chars in namespace // it can also return an error if the namespace doesn't respect RFC 952 and 1123. func NormalizeToFQDNRules(name string, stripEmailDomain bool) (string, error) { name = strings.ToLower(name) name = strings.ReplaceAll(name, "'", "") atIdx := strings.Index(name, "@") if stripEmailDomain && atIdx > 0 { name = name[:atIdx] } else { name = strings.ReplaceAll(name, "@", ".") } name = invalidCharsInNamespaceRegex.ReplaceAllString(name, "-") for _, elt := range strings.Split(name, ".") { if len(elt) > labelHostnameLength { return "", fmt.Errorf( "label %v is more than 63 chars: %w", elt, errInvalidNamespaceName, ) } } return name, nil } func CheckForFQDNRules(name string) error { if len(name) > labelHostnameLength { return fmt.Errorf( "DNS segment must not be over 63 chars. %v doesn't comply with this rule: %w", name, errInvalidNamespaceName, ) } if strings.ToLower(name) != name { return fmt.Errorf( "DNS segment should be lowercase. %v doesn't comply with this rule: %w", name, errInvalidNamespaceName, ) } if invalidCharsInNamespaceRegex.MatchString(name) { return fmt.Errorf( "DNS segment should only be composed of lowercase ASCII letters numbers, hyphen and dots. %v doesn't comply with theses rules: %w", name, errInvalidNamespaceName, ) } return nil }