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crypto.go
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/
crypto.go
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package leaf
import (
"bytes"
"context"
"errors"
"fmt"
"path/filepath"
"github.com/gopasspw/gopass/internal/backend"
"github.com/gopasspw/gopass/internal/backend/crypto/age"
"github.com/gopasspw/gopass/internal/config"
"github.com/gopasspw/gopass/internal/out"
"github.com/gopasspw/gopass/internal/store"
"github.com/gopasspw/gopass/pkg/ctxutil"
"github.com/gopasspw/gopass/pkg/debug"
)
func (s *Store) initCryptoBackend(ctx context.Context) error {
cb, err := backend.DetectCrypto(ctx, s.storage)
if err != nil {
return err
}
s.crypto = cb
return nil
}
// Crypto returns the crypto backend.
func (s *Store) Crypto() backend.Crypto {
return s.crypto
}
// ImportMissingPublicKeys will try to import any missing public keys from the
// .public-keys folder in the password store.
func (s *Store) ImportMissingPublicKeys(ctx context.Context, newrs ...string) error {
// do not import any keys for age, where public key == key id
// TODO: do not hard code exceptions, ask the backend if it supports it
if _, ok := s.crypto.(*age.Age); ok {
debug.Log("not importing public keys for age")
return nil
}
rs, err := s.GetRecipients(ctx, "")
if err != nil {
return fmt.Errorf("failed to get recipients: %w", err)
}
ids := append(rs.IDs(), newrs...)
for _, r := range ids {
debug.Log("Checking recipients %s ...", r)
// check if this recipient is missing
// we could list all keys outside the loop and just do the lookup here
// but this way we ensure to use the exact same lookup logic as
// gpg does on encryption
kl, err := s.crypto.FindRecipients(ctx, r)
if err != nil {
// this is expected if we don't have the key
debug.Log("Failed to get public key for %s: %s", r, err)
}
if len(kl) > 0 {
debug.Log("Keyring contains %d public keys for %s", len(kl), r)
if !IsPubkeyUpdate(ctx) {
continue
}
ex, ok := s.crypto.(keyExporter)
if ok {
pk, err := ex.ExportPublicKey(ctx, r)
pk2, err2 := s.getPublicKey(ctx, r)
if err == nil && err2 == nil && bytes.Equal(pk, pk2) {
continue
}
}
}
// get info about this public key
names, err := s.decodePublicKey(ctx, r)
if err != nil {
out.Errorf(ctx, "Failed to decode public key %s: %s", r, err)
continue
}
// we need to ask the user before importing
// any key material into his keyring!
if imf := ctxutil.GetImportFunc(ctx); imf != nil && !config.Bool(ctx, "core.autoimport") {
if !imf(ctx, r, names) {
continue
}
}
debug.Log("Public Key %s not found in keyring, importing", r)
// try to load this recipient
if err := s.importPublicKey(ctx, r); err != nil {
out.Errorf(ctx, "Failed to import public key for %s: %s", r, err)
continue
}
out.Printf(ctx, "Imported public key for %s into Keyring", r)
}
return nil
}
func (s *Store) decodePublicKey(ctx context.Context, r string) ([]string, error) {
for _, kd := range []string{keyDir, oldKeyDir} {
filename := filepath.Join(kd, r)
if !s.storage.Exists(ctx, filename) {
debug.Log("Public Key %s not found at %s", r, filename)
continue
}
buf, err := s.storage.Get(ctx, filename)
if err != nil {
return nil, fmt.Errorf("unable to read Public Key %q %q: %w", r, filename, err)
}
return s.crypto.ReadNamesFromKey(ctx, buf)
}
return nil, fmt.Errorf("public key %q not found", r)
}
// export an ASCII armored public key.
func (s *Store) exportPublicKey(ctx context.Context, exp keyExporter, r string) (string, error) {
filename := filepath.Join(keyDir, r)
// do not overwrite existing keys, unless forced
if !IsPubkeyUpdate(ctx) && s.storage.Exists(ctx, filename) {
debug.Log("leaving existing key for %s at %s alone", filename)
return "", nil
}
pk, err := exp.ExportPublicKey(ctx, r)
if err != nil {
return "", fmt.Errorf("failed to export public key: %w", err)
}
// ECC keys are at least 700 byte, RSA should be a lot bigger
if len(pk) < 32 {
return "", fmt.Errorf("exported key too small")
}
if err := s.storage.Set(ctx, filename, pk); err != nil {
if !errors.Is(err, store.ErrMeaninglessWrite) {
return "", fmt.Errorf("failed to write exported public key to store: %w", err)
}
debug.Log("No need to write exported public key %s: already stored", r)
}
debug.Log("exported public keys for %s to %s", r, filename)
return filename, nil
}
type keyImporter interface {
ImportPublicKey(ctx context.Context, key []byte) error
}
type keyExporter interface {
ExportPublicKey(ctx context.Context, id string) ([]byte, error)
}
func (s *Store) getPublicKey(ctx context.Context, r string) ([]byte, error) {
for _, kd := range []string{keyDir, oldKeyDir} {
filename := filepath.Join(kd, r)
if !s.storage.Exists(ctx, filename) {
debug.Log("Public Key %s not found at %s", r, filename)
continue
}
pk, err := s.storage.Get(ctx, filename)
return pk, err
}
return nil, fmt.Errorf("public key not found in store")
}
// import an public key into the default keyring.
func (s *Store) importPublicKey(ctx context.Context, r string) error {
im, ok := s.crypto.(keyImporter)
if !ok {
debug.Log("importing public keys not supported by %T", s.crypto)
return nil
}
pk, err := s.getPublicKey(ctx, r)
if err != nil {
return err
}
return im.ImportPublicKey(ctx, pk)
}
type locker interface {
Lock()
}
// Lock clears the credential caches of all supported backends.
func (s *Store) Lock() error {
f, ok := s.crypto.(locker)
if !ok {
debug.Log("locking not supported by %T in %q", s.crypto, s.alias)
}
if f == nil {
debug.Log("backend %q invalid", s.alias)
return nil
}
f.Lock()
debug.Log("locked backend %T for %q", s.crypto, s.alias)
return nil
}