package daemon // import "github.com/docker/docker/daemon" import ( "encoding/json" "encoding/pem" "fmt" "os" "path/filepath" "github.com/docker/docker/pkg/ioutils" "github.com/docker/docker/pkg/system" "github.com/docker/libtrust" ) // LoadOrCreateTrustKey attempts to load the libtrust key at the given path, // otherwise generates a new one // TODO: this should use more of libtrust.LoadOrCreateTrustKey which may need // a refactor or this function to be moved into libtrust func loadOrCreateTrustKey(trustKeyPath string) (libtrust.PrivateKey, error) { err := system.MkdirAll(filepath.Dir(trustKeyPath), 0755) if err != nil { return nil, err } trustKey, err := libtrust.LoadKeyFile(trustKeyPath) if err == libtrust.ErrKeyFileDoesNotExist { trustKey, err = libtrust.GenerateECP256PrivateKey() if err != nil { return nil, fmt.Errorf("Error generating key: %s", err) } encodedKey, err := serializePrivateKey(trustKey, filepath.Ext(trustKeyPath)) if err != nil { return nil, fmt.Errorf("Error serializing key: %s", err) } if err := ioutils.AtomicWriteFile(trustKeyPath, encodedKey, os.FileMode(0600)); err != nil { return nil, fmt.Errorf("Error saving key file: %s", err) } } else if err != nil { return nil, fmt.Errorf("Error loading key file %s: %s", trustKeyPath, err) } return trustKey, nil } func serializePrivateKey(key libtrust.PrivateKey, ext string) (encoded []byte, err error) { if ext == ".json" || ext == ".jwk" { encoded, err = json.Marshal(key) if err != nil { return nil, fmt.Errorf("unable to encode private key JWK: %s", err) } } else { pemBlock, err := key.PEMBlock() if err != nil { return nil, fmt.Errorf("unable to encode private key PEM: %s", err) } encoded = pem.EncodeToMemory(pemBlock) } return }