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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2015-2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package asserts
import (
"errors"
"fmt"
"os"
"path/filepath"
"sync"
)
// the default simple filesystem based keypair manager/backstore
const (
privateKeysLayoutVersion = "v1"
privateKeysRoot = "private-keys-" + privateKeysLayoutVersion
)
type filesystemKeypairManager struct {
top string
mu sync.RWMutex
}
// OpenFSKeypairManager opens a filesystem backed assertions backstore under path.
func OpenFSKeypairManager(path string) (KeypairManager, error) {
top := filepath.Join(path, privateKeysRoot)
err := ensureTop(top)
if err != nil {
return nil, err
}
return &filesystemKeypairManager{top: top}, nil
}
var errKeypairAlreadyExists = errors.New("key pair with given key id already exists")
func (fskm *filesystemKeypairManager) Put(privKey PrivateKey) error {
keyID := privKey.PublicKey().ID()
if entryExists(fskm.top, keyID) {
return errKeypairAlreadyExists
}
encoded, err := encodePrivateKey(privKey)
if err != nil {
return fmt.Errorf("cannot store private key: %v", err)
}
fskm.mu.Lock()
defer fskm.mu.Unlock()
err = atomicWriteEntry(encoded, true, fskm.top, keyID)
if err != nil {
return fmt.Errorf("cannot store private key: %v", err)
}
return nil
}
var errKeypairNotFound = &keyNotFoundError{msg: "cannot find key pair"}
func (fskm *filesystemKeypairManager) Get(keyID string) (PrivateKey, error) {
fskm.mu.RLock()
defer fskm.mu.RUnlock()
encoded, err := readEntry(fskm.top, keyID)
if os.IsNotExist(err) {
return nil, errKeypairNotFound
}
if err != nil {
return nil, fmt.Errorf("cannot read key pair: %v", err)
}
privKey, err := decodePrivateKey(encoded)
if err != nil {
return nil, fmt.Errorf("cannot decode key pair: %v", err)
}
return privKey, nil
}
func (fskm *filesystemKeypairManager) Delete(keyID string) error {
fskm.mu.RLock()
defer fskm.mu.RUnlock()
err := removeEntry(fskm.top, keyID)
if err != nil {
if os.IsNotExist(err) {
return errKeypairNotFound
}
return err
}
return nil
}
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