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// -*- Mode: Go; indent-tabs-mode: t -*-
//go:build !nosecboot
/*
* Copyright (C) 2025 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 secboot
import (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
sb "github.com/snapcore/secboot"
"github.com/snapcore/snapd/systemd"
)
type systemdAuthRequestor struct {
}
func (r *systemdAuthRequestor) askPassword(sourceDevicePath, msg, credentialName string) (string, error) {
enableCredential := true
err := systemd.EnsureAtLeast(249)
if systemd.IsSystemdTooOld(err) {
enableCredential = false
}
var args []string
args = append(args, "--icon", "drive-harddisk")
args = append(args, "--id", filepath.Base(os.Args[0])+":"+sourceDevicePath)
if enableCredential {
args = append(args, fmt.Sprintf("--credential=snapd.%s", credentialName))
}
args = append(args, msg)
cmd := exec.Command(
"systemd-ask-password",
args...,
)
out := new(bytes.Buffer)
cmd.Stdout = out
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("cannot execute systemd-ask-password: %v", err)
}
result, err := out.ReadString('\n')
if err != nil {
// The only error returned from bytes.Buffer.ReadString is io.EOF.
return "", errors.New("systemd-ask-password output is missing terminating newline")
}
return strings.TrimRight(result, "\n"), nil
}
func (r *systemdAuthRequestor) RequestPassphrase(volumeName, sourceDevicePath string) (string, error) {
msg := fmt.Sprintf("Please enter the passphrase for volume %s for device %s", volumeName, sourceDevicePath)
return r.askPassword(sourceDevicePath, msg, "passphrase")
}
func (r *systemdAuthRequestor) RequestRecoveryKey(volumeName, sourceDevicePath string) (sb.RecoveryKey, error) {
msg := fmt.Sprintf("Please enter the recovery key for volume %s for device %s", volumeName, sourceDevicePath)
passphrase, err := r.askPassword(sourceDevicePath, msg, "recovery")
if err != nil {
return sb.RecoveryKey{}, err
}
key, err := sb.ParseRecoveryKey(passphrase)
if err != nil {
return sb.RecoveryKey{}, fmt.Errorf("cannot parse recovery key: %w", err)
}
return key, nil
}
func NewSystemdAuthRequestor() sb.AuthRequestor {
return &systemdAuthRequestor{}
}
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