DockerCLI/vendor/github.com/docker/notary/cryptoservice/crypto_service.go

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package cryptoservice
import (
"crypto/rand"
"fmt"
"crypto/x509"
"encoding/pem"
"errors"
"github.com/Sirupsen/logrus"
"github.com/docker/notary"
"github.com/docker/notary/trustmanager"
"github.com/docker/notary/tuf/data"
"github.com/docker/notary/tuf/utils"
)
var (
// ErrNoValidPrivateKey is returned if a key being imported doesn't
// look like a private key
ErrNoValidPrivateKey = errors.New("no valid private key found")
// ErrRootKeyNotEncrypted is returned if a root key being imported is
// unencrypted
ErrRootKeyNotEncrypted = errors.New("only encrypted root keys may be imported")
)
// CryptoService implements Sign and Create, holding a specific GUN and keystore to
// operate on
type CryptoService struct {
keyStores []trustmanager.KeyStore
}
// NewCryptoService returns an instance of CryptoService
func NewCryptoService(keyStores ...trustmanager.KeyStore) *CryptoService {
return &CryptoService{keyStores: keyStores}
}
// Create is used to generate keys for targets, snapshots and timestamps
func (cs *CryptoService) Create(role, gun, algorithm string) (data.PublicKey, error) {
var privKey data.PrivateKey
var err error
switch algorithm {
case data.RSAKey:
privKey, err = utils.GenerateRSAKey(rand.Reader, notary.MinRSABitSize)
if err != nil {
return nil, fmt.Errorf("failed to generate RSA key: %v", err)
}
case data.ECDSAKey:
privKey, err = utils.GenerateECDSAKey(rand.Reader)
if err != nil {
return nil, fmt.Errorf("failed to generate EC key: %v", err)
}
case data.ED25519Key:
privKey, err = utils.GenerateED25519Key(rand.Reader)
if err != nil {
return nil, fmt.Errorf("failed to generate ED25519 key: %v", err)
}
default:
return nil, fmt.Errorf("private key type not supported for key generation: %s", algorithm)
}
logrus.Debugf("generated new %s key for role: %s and keyID: %s", algorithm, role, privKey.ID())
// Store the private key into our keystore
for _, ks := range cs.keyStores {
err = ks.AddKey(trustmanager.KeyInfo{Role: role, Gun: gun}, privKey)
if err == nil {
return data.PublicKeyFromPrivate(privKey), nil
}
}
if err != nil {
return nil, fmt.Errorf("failed to add key to filestore: %v", err)
}
return nil, fmt.Errorf("keystores would not accept new private keys for unknown reasons")
}
// GetPrivateKey returns a private key and role if present by ID.
func (cs *CryptoService) GetPrivateKey(keyID string) (k data.PrivateKey, role string, err error) {
for _, ks := range cs.keyStores {
if k, role, err = ks.GetKey(keyID); err == nil {
return
}
switch err.(type) {
case trustmanager.ErrPasswordInvalid, trustmanager.ErrAttemptsExceeded:
return
default:
continue
}
}
return // returns whatever the final values were
}
// GetKey returns a key by ID
func (cs *CryptoService) GetKey(keyID string) data.PublicKey {
privKey, _, err := cs.GetPrivateKey(keyID)
if err != nil {
return nil
}
return data.PublicKeyFromPrivate(privKey)
}
// GetKeyInfo returns role and GUN info of a key by ID
func (cs *CryptoService) GetKeyInfo(keyID string) (trustmanager.KeyInfo, error) {
for _, store := range cs.keyStores {
if info, err := store.GetKeyInfo(keyID); err == nil {
return info, nil
}
}
return trustmanager.KeyInfo{}, fmt.Errorf("Could not find info for keyID %s", keyID)
}
// RemoveKey deletes a key by ID
func (cs *CryptoService) RemoveKey(keyID string) (err error) {
for _, ks := range cs.keyStores {
ks.RemoveKey(keyID)
}
return // returns whatever the final values were
}
// AddKey adds a private key to a specified role.
// The GUN is inferred from the cryptoservice itself for non-root roles
func (cs *CryptoService) AddKey(role, gun string, key data.PrivateKey) (err error) {
// First check if this key already exists in any of our keystores
for _, ks := range cs.keyStores {
if keyInfo, err := ks.GetKeyInfo(key.ID()); err == nil {
if keyInfo.Role != role {
return fmt.Errorf("key with same ID already exists for role: %s", keyInfo.Role)
}
logrus.Debugf("key with same ID %s and role %s already exists", key.ID(), keyInfo.Role)
return nil
}
}
// If the key didn't exist in any of our keystores, add and return on the first successful keystore
for _, ks := range cs.keyStores {
// Try to add to this keystore, return if successful
if err = ks.AddKey(trustmanager.KeyInfo{Role: role, Gun: gun}, key); err == nil {
return nil
}
}
return // returns whatever the final values were
}
// ListKeys returns a list of key IDs valid for the given role
func (cs *CryptoService) ListKeys(role string) []string {
var res []string
for _, ks := range cs.keyStores {
for k, r := range ks.ListKeys() {
if r.Role == role {
res = append(res, k)
}
}
}
return res
}
// ListAllKeys returns a map of key IDs to role
func (cs *CryptoService) ListAllKeys() map[string]string {
res := make(map[string]string)
for _, ks := range cs.keyStores {
for k, r := range ks.ListKeys() {
res[k] = r.Role // keys are content addressed so don't care about overwrites
}
}
return res
}
// CheckRootKeyIsEncrypted makes sure the root key is encrypted. We have
// internal assumptions that depend on this.
func CheckRootKeyIsEncrypted(pemBytes []byte) error {
block, _ := pem.Decode(pemBytes)
if block == nil {
return ErrNoValidPrivateKey
}
if !x509.IsEncryptedPEMBlock(block) {
return ErrRootKeyNotEncrypted
}
return nil
}