package headscale import ( "fmt" "strings" "time" v1 "github.com/juanfont/headscale/gen/go/headscale/v1" "golang.org/x/crypto/bcrypt" "google.golang.org/protobuf/types/known/timestamppb" ) const ( apiPrefixLength = 7 apiKeyLength = 32 apiKeyParts = 2 errAPIKeyFailedToParse = Error("Failed to parse ApiKey") ) // APIKey describes the datamodel for API keys used to remotely authenticate with // headscale. type APIKey struct { ID uint64 `gorm:"primary_key"` Prefix string `gorm:"uniqueIndex"` Hash []byte CreatedAt *time.Time Expiration *time.Time LastSeen *time.Time } // CreateAPIKey creates a new ApiKey in a namespace, and returns it. func (h *Headscale) CreateAPIKey( expiration *time.Time, ) (string, *APIKey, error) { prefix, err := GenerateRandomStringURLSafe(apiPrefixLength) if err != nil { return "", nil, err } toBeHashed, err := GenerateRandomStringURLSafe(apiKeyLength) if err != nil { return "", nil, err } // Key to return to user, this will only be visible _once_ keyStr := prefix + "." + toBeHashed hash, err := bcrypt.GenerateFromPassword([]byte(toBeHashed), bcrypt.DefaultCost) if err != nil { return "", nil, err } key := APIKey{ Prefix: prefix, Hash: hash, Expiration: expiration, } h.db.Save(&key) return keyStr, &key, nil } // ListAPIKeys returns the list of ApiKeys for a namespace. func (h *Headscale) ListAPIKeys() ([]APIKey, error) { keys := []APIKey{} if err := h.db.Find(&keys).Error; err != nil { return nil, err } return keys, nil } // GetAPIKey returns a ApiKey for a given key. func (h *Headscale) GetAPIKey(prefix string) (*APIKey, error) { key := APIKey{} if result := h.db.First(&key, "prefix = ?", prefix); result.Error != nil { return nil, result.Error } return &key, nil } // GetAPIKeyByID returns a ApiKey for a given id. func (h *Headscale) GetAPIKeyByID(id uint64) (*APIKey, error) { key := APIKey{} if result := h.db.Find(&APIKey{ID: id}).First(&key); result.Error != nil { return nil, result.Error } return &key, nil } // DestroyAPIKey destroys a ApiKey. Returns error if the ApiKey // does not exist. func (h *Headscale) DestroyAPIKey(key APIKey) error { if result := h.db.Unscoped().Delete(key); result.Error != nil { return result.Error } return nil } // ExpireAPIKey marks a ApiKey as expired. func (h *Headscale) ExpireAPIKey(key *APIKey) error { if err := h.db.Model(&key).Update("Expiration", time.Now()).Error; err != nil { return err } return nil } func (h *Headscale) ValidateAPIKey(keyStr string) (bool, error) { prefix, hash, err := splitAPIKey(keyStr) if err != nil { return false, fmt.Errorf("failed to validate api key: %w", err) } key, err := h.GetAPIKey(prefix) if err != nil { return false, fmt.Errorf("failed to validate api key: %w", err) } if key.Expiration.Before(time.Now()) { return false, nil } if err := bcrypt.CompareHashAndPassword(key.Hash, []byte(hash)); err != nil { return false, err } return true, nil } func splitAPIKey(key string) (string, string, error) { parts := strings.Split(key, ".") if len(parts) != apiKeyParts { return "", "", errAPIKeyFailedToParse } return parts[0], parts[1], nil } func (key *APIKey) toProto() *v1.ApiKey { protoKey := v1.ApiKey{ Id: key.ID, Prefix: key.Prefix, } if key.Expiration != nil { protoKey.Expiration = timestamppb.New(*key.Expiration) } if key.CreatedAt != nil { protoKey.CreatedAt = timestamppb.New(*key.CreatedAt) } if key.LastSeen != nil { protoKey.LastSeen = timestamppb.New(*key.LastSeen) } return &protoKey }