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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 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 signtool
import (
"errors"
"fmt"
"os"
"golang.org/x/crypto/ssh/terminal"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/i18n"
)
// KeypairManager is an interface for common methods of ExternalKeypairManager
// and GPGPKeypairManager.
type KeypairManager interface {
asserts.KeypairManager
GetByName(keyNname string) (asserts.PrivateKey, error)
Export(keyName string) ([]byte, error)
List() ([]asserts.ExternalKeyInfo, error)
DeleteByName(keyName string) error
}
// GetKeypairManager returns a KeypairManager - either the standrd gpg-based
// or external one if set via SNAPD_EXT_KEYMGR environment variable.
func GetKeypairManager() (KeypairManager, error) {
keymgrPath := os.Getenv("SNAPD_EXT_KEYMGR")
if keymgrPath != "" {
keypairMgr, err := asserts.NewExternalKeypairManager(keymgrPath)
if err != nil {
return nil, fmt.Errorf(i18n.G("cannot setup external keypair manager: %v"), err)
}
return keypairMgr, nil
}
keypairMgr := asserts.NewGPGKeypairManager()
return keypairMgr, nil
}
type takingPassKeyGen interface {
Generate(passphrase string, keyName string) error
}
type ownSecuringKeyGen interface {
Generate(keyName string) error
}
// GenerateKey generates a private RSA key using the provided keypairMgr.
func GenerateKey(keypairMgr KeypairManager, keyName string) error {
switch keyGen := keypairMgr.(type) {
case takingPassKeyGen:
return takePassGenKey(keyGen, keyName)
case ownSecuringKeyGen:
err := keyGen.Generate(keyName)
if _, ok := err.(*asserts.ExternalUnsupportedOpError); ok {
return fmt.Errorf(i18n.G("cannot generate external keypair manager key via snap command, use the appropriate external procedure to create a 4096-bit RSA key under the name/label %q"), keyName)
}
return err
default:
return fmt.Errorf("internal error: unsupported keypair manager %T", keypairMgr)
}
}
func takePassGenKey(keyGen takingPassKeyGen, keyName string) error {
fmt.Fprint(Stdout, i18n.G("Passphrase: "))
passphrase, err := terminal.ReadPassword(0)
fmt.Fprint(Stdout, "\n")
if err != nil {
return err
}
fmt.Fprint(Stdout, i18n.G("Confirm passphrase: "))
confirmPassphrase, err := terminal.ReadPassword(0)
fmt.Fprint(Stdout, "\n")
if err != nil {
return err
}
if string(passphrase) != string(confirmPassphrase) {
return errors.New(i18n.G("passphrases do not match"))
}
return keyGen.Generate(string(passphrase), keyName)
}
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