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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
}
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