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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2024 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"
"fmt"
"io"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/secboot/keys"
)
// KeyDataWriter is an interface used by KeyData to write the data to
// persistent storage in an atomic way.
// The interface is compatible with identically named interface
// from github.com/canonical/secboot.
type KeyDataWriter interface {
io.Writer
Commit() error
}
// BootstrappedContainer is an abstraction for an encrypted container
// along with a key that is able to enroll other keys. This key is
// meant to be an initial key that is removed after all required keys
// are enrolled, by calling RemoveBootstrapKey.
type BootstrappedContainer interface {
// AddKey adds a key "newKey" to "slotName".
AddKey(slotName string, newKey []byte) error
// AddRecoveryKey adds a recovery key "rkey" to "slotName".
AddRecoveryKey(slotName string, rkey keys.RecoveryKey) error
// GetTokenWriter returns a keydata writer that writes to the token.
GetTokenWriter(slotName string) (KeyDataWriter, error)
// RemoveBootstrapKey removes the bootstrap key.
RemoveBootstrapKey() error
// RegisterKeyAsUsed registers an unlock key and its primary key in the kernel keyring.
RegisterKeyAsUsed(primaryKey []byte, unlockKey []byte)
}
func createBootstrappedContainerMockImpl(key DiskUnlockKey, devicePath string) BootstrappedContainer {
panic("trying to create a bootstrapped container in a non-secboot build")
}
var CreateBootstrappedContainer = createBootstrappedContainerMockImpl
type MockBootstrappedContainer struct {
BootstrapKeyRemoved bool
Slots map[string][]byte
Tokens map[string][]byte
}
func CreateMockBootstrappedContainer() *MockBootstrappedContainer {
osutil.MustBeTestBinary("CreateMockBootstrappedContainer can be only called from tests")
return &MockBootstrappedContainer{Slots: make(map[string][]byte), Tokens: make(map[string][]byte)}
}
type mockKeyDataWriter struct {
m *MockBootstrappedContainer
slotName string
buf bytes.Buffer
}
func (m *mockKeyDataWriter) Write(p []byte) (n int, err error) {
return m.buf.Write(p)
}
func (m *mockKeyDataWriter) Commit() error {
m.m.Tokens[m.slotName] = m.buf.Bytes()
return nil
}
func (m *MockBootstrappedContainer) AddKey(slotName string, newKey []byte) error {
if m.BootstrapKeyRemoved {
return fmt.Errorf("internal error: bootstrapped container was a already finished")
}
_, ok := m.Slots[slotName]
if ok {
return fmt.Errorf("slot already taken")
}
m.Slots[slotName] = newKey
return nil
}
func (m *MockBootstrappedContainer) AddRecoveryKey(slotName string, rkey keys.RecoveryKey) error {
if m.BootstrapKeyRemoved {
return fmt.Errorf("internal error: bootstrapped container was a already finished")
}
_, ok := m.Slots[slotName]
if ok {
return fmt.Errorf("slot already taken")
}
m.Slots[slotName] = rkey[:]
return nil
}
func (m *MockBootstrappedContainer) GetTokenWriter(slotName string) (KeyDataWriter, error) {
return &mockKeyDataWriter{m: m, slotName: slotName}, nil
}
func (l *MockBootstrappedContainer) RemoveBootstrapKey() error {
l.BootstrapKeyRemoved = true
return nil
}
func (l *MockBootstrappedContainer) RegisterKeyAsUsed(primaryKey []byte, unlockKey []byte) {
}
|
