2017-08-18 04:50:15 +03:00
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package macaroons
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import (
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"crypto/rand"
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"fmt"
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"io"
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"github.com/boltdb/bolt"
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)
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const (
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// RootKeyLen is the length of a root key.
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RootKeyLen = 32
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)
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var (
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// rootKeyBucketName is the name of the root key store bucket.
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rootKeyBucketName = []byte("macrootkeys")
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// defaultRootKeyID is the ID of the default root key. The first is
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// just 0, to emulate the memory storage that comes with bakery.
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2017-08-22 09:18:19 +03:00
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//
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2017-08-18 04:50:15 +03:00
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// TODO(aakselrod): Add support for key rotation.
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defaultRootKeyID = "0"
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// macaroonBucketName is the name of the macaroon store bucket.
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macaroonBucketName = []byte("macaroons")
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)
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// RootKeyStorage implements the bakery.RootKeyStorage interface.
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type RootKeyStorage struct {
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*bolt.DB
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}
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// NewRootKeyStorage creates a RootKeyStorage instance.
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// TODO(aakselrod): Add support for encryption of data with passphrase.
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func NewRootKeyStorage(db *bolt.DB) (*RootKeyStorage, error) {
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// If the store's bucket doesn't exist, create it.
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err := db.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucketIfNotExists(rootKeyBucketName)
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return err
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})
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if err != nil {
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return nil, err
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}
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2017-08-22 09:18:19 +03:00
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2017-08-18 04:50:15 +03:00
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// Return the DB wrapped in a RootKeyStorage object.
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return &RootKeyStorage{db}, nil
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}
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// Get implements the Get method for the bakery.RootKeyStorage interface.
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func (r *RootKeyStorage) Get(id string) ([]byte, error) {
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var rootKey []byte
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err := r.View(func(tx *bolt.Tx) error {
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rootKey = tx.Bucket(rootKeyBucketName).Get([]byte(id))
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if len(rootKey) == 0 {
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return fmt.Errorf("root key with id %s doesn't exist",
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id)
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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2017-08-22 09:18:19 +03:00
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2017-08-18 04:50:15 +03:00
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return rootKey, nil
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}
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// RootKey implements the RootKey method for the bakery.RootKeyStorage
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// interface.
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// TODO(aakselrod): Add support for key rotation.
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func (r *RootKeyStorage) RootKey() ([]byte, string, error) {
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var rootKey []byte
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id := defaultRootKeyID
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err := r.Update(func(tx *bolt.Tx) error {
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ns := tx.Bucket(rootKeyBucketName)
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rootKey = ns.Get([]byte(id))
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// If there's no root key stored in the bucket yet, create one.
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if len(rootKey) != 0 {
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return nil
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}
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// Create a RootKeyLen-byte root key.
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rootKey = make([]byte, RootKeyLen)
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if _, err := io.ReadFull(rand.Reader, rootKey[:]); err != nil {
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return err
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}
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return ns.Put([]byte(id), rootKey)
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})
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if err != nil {
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return nil, "", err
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}
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2017-08-22 09:18:19 +03:00
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2017-08-18 04:50:15 +03:00
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return rootKey, id, nil
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}
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// Storage implements the bakery.Storage interface.
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type Storage struct {
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*bolt.DB
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}
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// NewStorage creates a Storage instance.
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2017-08-22 09:18:19 +03:00
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//
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2017-08-18 04:50:15 +03:00
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// TODO(aakselrod): Add support for encryption of data with passphrase.
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func NewStorage(db *bolt.DB) (*Storage, error) {
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// If the store's bucket doesn't exist, create it.
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err := db.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucketIfNotExists(macaroonBucketName)
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return err
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})
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if err != nil {
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return nil, err
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}
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2017-08-22 09:18:19 +03:00
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2017-08-18 04:50:15 +03:00
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// Return the DB wrapped in a Storage object.
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return &Storage{db}, nil
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}
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// Put implements the Put method for the bakery.Storage interface.
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func (s *Storage) Put(location string, item string) error {
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return s.Update(func(tx *bolt.Tx) error {
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return tx.Bucket(macaroonBucketName).Put([]byte(location),
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[]byte(item))
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})
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}
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// Get implements the Get method for the bakery.Storage interface.
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func (s *Storage) Get(location string) (string, error) {
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var item string
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err := s.View(func(tx *bolt.Tx) error {
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itemBytes := tx.Bucket(macaroonBucketName).Get([]byte(location))
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if len(itemBytes) == 0 {
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return fmt.Errorf("couldn't get item for location %s",
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location)
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}
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item = string(itemBytes)
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return nil
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})
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if err != nil {
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return "", err
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}
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2017-08-22 09:18:19 +03:00
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2017-08-18 04:50:15 +03:00
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return item, nil
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}
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// Del implements the Del method for the bakery.Storage interface.
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func (s *Storage) Del(location string) error {
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return s.Update(func(tx *bolt.Tx) error {
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return tx.Bucket(macaroonBucketName).Delete([]byte(location))
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})
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}
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