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237 lines
5.7 KiB
237 lines
5.7 KiB
/*
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package filestorage provides a secure on-disk storage of private keys and
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metadata. Security is enforced by file and directory permissions, much
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like standard ssh key storage.
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*/
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package filestorage
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import (
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"encoding/hex"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"github.com/pkg/errors"
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crypto "github.com/tendermint/go-crypto"
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keys "github.com/tendermint/go-crypto/keys"
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)
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const (
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// BlockType is the type of block.
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BlockType = "Tendermint Light Client"
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// PrivExt is the extension for private keys.
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PrivExt = "tlc"
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// PubExt is the extensions for public keys.
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PubExt = "pub"
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keyPerm = os.FileMode(0600)
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// pubPerm = os.FileMode(0644)
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dirPerm = os.FileMode(0700)
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)
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// FileStore is a file-based key storage with tight permissions.
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type FileStore struct {
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keyDir string
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}
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// New creates an instance of file-based key storage with tight permissions
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//
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// dir should be an absolute path of a directory owner by this user. It will
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// be created if it doesn't exist already.
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func New(dir string) FileStore {
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err := os.MkdirAll(dir, dirPerm)
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if err != nil {
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panic(err)
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}
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return FileStore{dir}
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}
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// assert FileStore satisfies keys.Storage
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var _ keys.Storage = FileStore{}
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// Put creates two files, one with the public info as json, the other
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// with the (encoded) private key as gpg ascii-armor style
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func (s FileStore) Put(name string, salt, key []byte, info keys.Info) error {
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pub, priv := s.nameToPaths(name)
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// write public info
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err := writeInfo(pub, info)
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if err != nil {
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return err
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}
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// write private info
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return write(priv, name, salt, key)
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}
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// Get loads the info and (encoded) private key from the directory
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// It uses `name` to generate the filename, and returns an error if the
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// files don't exist or are in the incorrect format
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func (s FileStore) Get(name string) (salt []byte, key []byte, info keys.Info, err error) {
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pub, priv := s.nameToPaths(name)
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info, err = readInfo(pub)
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if err != nil {
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return nil, nil, info, err
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}
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salt, key, _, err = read(priv)
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return salt, key, info.Format(), err
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}
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// List parses the key directory for public info and returns a list of
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// Info for all keys located in this directory.
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func (s FileStore) List() (keys.Infos, error) {
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dir, err := os.Open(s.keyDir)
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if err != nil {
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return nil, errors.Wrap(err, "List Keys")
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}
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defer dir.Close()
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names, err := dir.Readdirnames(0)
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if err != nil {
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return nil, errors.Wrap(err, "List Keys")
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}
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// filter names for .pub ending and load them one by one
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// half the files is a good guess for pre-allocating the slice
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infos := make([]keys.Info, 0, len(names)/2)
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for _, name := range names {
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if strings.HasSuffix(name, PubExt) {
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p := path.Join(s.keyDir, name)
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info, err := readInfo(p)
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if err != nil {
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return nil, err
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}
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infos = append(infos, info.Format())
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}
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}
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return infos, nil
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}
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// Delete permanently removes the public and private info for the named key
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// The calling function should provide some security checks first.
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func (s FileStore) Delete(name string) error {
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pub, priv := s.nameToPaths(name)
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err := os.Remove(priv)
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if err != nil {
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return errors.Wrap(err, "Deleting Private Key")
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}
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err = os.Remove(pub)
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return errors.Wrap(err, "Deleting Public Key")
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}
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func (s FileStore) nameToPaths(name string) (pub, priv string) {
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privName := fmt.Sprintf("%s.%s", name, PrivExt)
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pubName := fmt.Sprintf("%s.%s", name, PubExt)
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return path.Join(s.keyDir, pubName), path.Join(s.keyDir, privName)
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}
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func readInfo(path string) (info keys.Info, err error) {
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f, err := os.Open(path)
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if err != nil {
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return info, errors.Wrap(err, "Reading data")
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}
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defer f.Close()
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d, err := ioutil.ReadAll(f)
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if err != nil {
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return info, errors.Wrap(err, "Reading data")
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}
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block, headers, key, err := crypto.DecodeArmor(string(d))
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if err != nil {
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return info, errors.Wrap(err, "Invalid Armor")
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}
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if block != BlockType {
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return info, errors.Errorf("Unknown key type: %s", block)
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}
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pk, _ := crypto.PubKeyFromBytes(key)
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info.Name = headers["name"]
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info.PubKey = pk
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return info, nil
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}
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func read(path string) (salt, key []byte, name string, err error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, nil, "", errors.Wrap(err, "Reading data")
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}
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defer f.Close()
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d, err := ioutil.ReadAll(f)
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if err != nil {
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return nil, nil, "", errors.Wrap(err, "Reading data")
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}
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block, headers, key, err := crypto.DecodeArmor(string(d))
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if err != nil {
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return nil, nil, "", errors.Wrap(err, "Invalid Armor")
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}
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if block != BlockType {
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return nil, nil, "", errors.Errorf("Unknown key type: %s", block)
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}
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if headers["kdf"] != "bcrypt" {
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return nil, nil, "", errors.Errorf("Unrecognized KDF type: %v", headers["kdf"])
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}
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if headers["salt"] == "" {
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return nil, nil, "", errors.Errorf("Missing salt bytes")
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}
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salt, err = hex.DecodeString(headers["salt"])
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if err != nil {
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return nil, nil, "", errors.Errorf("Error decoding salt: %v", err.Error())
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}
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return salt, key, headers["name"], nil
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}
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func writeInfo(path string, info keys.Info) error {
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f, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_WRONLY, keyPerm)
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if err != nil {
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return errors.Wrap(err, "Writing data")
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}
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defer f.Close()
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headers := map[string]string{"name": info.Name}
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text := crypto.EncodeArmor(BlockType, headers, info.PubKey.Bytes())
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_, err = f.WriteString(text)
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return errors.Wrap(err, "Writing data")
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}
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func write(path, name string, salt, key []byte) error {
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f, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_WRONLY, keyPerm)
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if err != nil {
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return errors.Wrap(err, "Writing data")
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}
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defer f.Close()
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headers := map[string]string{
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"name": name,
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"kdf": "bcrypt",
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"salt": fmt.Sprintf("%X", salt),
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}
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text := crypto.EncodeArmor(BlockType, headers, key)
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_, err = f.WriteString(text)
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return errors.Wrap(err, "Writing data")
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}
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