1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// -*- Mode: Go; indent-tabs-mode: t -*-
//go:build !nosecboot
/*
* 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 (
"fmt"
"strings"
"golang.org/x/sys/unix"
sb "github.com/snapcore/secboot"
"github.com/snapcore/snapd/logger"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/secboot/keys"
)
type bootstrappedContainer struct {
tempContainerKeySlot string
devicePath string
key DiskUnlockKey
finished bool
}
func newLUKS2KeyDataWriterImpl(devicePath string, name string) (KeyDataWriter, error) {
return sb.NewLUKS2KeyDataWriter(devicePath, name)
}
var (
newLUKS2KeyDataWriter = newLUKS2KeyDataWriterImpl
unixAddKey = unix.AddKey
)
func slotNameOrDefault(slotName string) string {
if slotName == "" {
return "default"
}
return slotName
}
func (bc *bootstrappedContainer) AddKey(slotName string, newKey []byte) error {
if bc.finished {
return fmt.Errorf("internal error: bootstrapped container was a already finished")
}
if err := sbAddLUKS2ContainerUnlockKey(bc.devicePath, slotNameOrDefault(slotName), sb.DiskUnlockKey(bc.key), sb.DiskUnlockKey(newKey)); err != nil {
return err
}
return nil
}
func (bc *bootstrappedContainer) AddRecoveryKey(slotName string, rkey keys.RecoveryKey) error {
if bc.finished {
return fmt.Errorf("internal error: bootstrapped container was a already finished")
}
if slotName == "" {
slotName = "default-recovery"
}
if err := sbAddLUKS2ContainerRecoveryKey(bc.devicePath, slotName, sb.DiskUnlockKey(bc.key), sb.RecoveryKey(rkey)); err != nil {
return err
}
return nil
}
func (bc *bootstrappedContainer) GetTokenWriter(slotName string) (KeyDataWriter, error) {
return newLUKS2KeyDataWriter(bc.devicePath, slotNameOrDefault(slotName))
}
func (bc *bootstrappedContainer) RemoveBootstrapKey() error {
if bc.finished {
return nil
}
bc.finished = true
if err := sbDeleteLUKS2ContainerKey(bc.devicePath, bc.tempContainerKeySlot); err != nil {
return fmt.Errorf("cannot remove bootstrap key: %v", err)
}
return nil
}
func (bc *bootstrappedContainer) RegisterKeyAsUsed(primaryKey []byte, unlockKey []byte) {
// secboot unlocking does not fail when it cannot save keys to the kerying. So
// we also want to have a similar behavior and just print warnings in this function.
devlinks, err := disksDevlinks(bc.devicePath)
if err != nil {
logger.Noticef("warning: cannot find symlinks for %s: %v", bc.devicePath, err)
return
}
var uuidDevlink string
for _, devlink := range devlinks {
if strings.HasPrefix(devlink, "/dev/disk/by-uuid/") {
uuidDevlink = devlink
break
}
}
if uuidDevlink == "" {
logger.Noticef("warning: missing by-uuid symlink for %s", bc.devicePath)
return
}
logger.Debugf("registering kerying keys for %s (%s)", bc.devicePath, uuidDevlink)
// Format of key for secboot is <prefix>:<path>:<purpose>.
// See internal/keyring/keyring.go in secboot.
// "purpose" is either "aux" or "unlock".
// See crypt.go in secboot.
if _, err := unixAddKey("user", fmt.Sprintf("%s:%s:unlock", defaultKeyringPrefix, uuidDevlink), unlockKey, unix.KEY_SPEC_USER_KEYRING); err != nil {
logger.Noticef("warning: cannot register unlock key for %s: %v", uuidDevlink, err)
}
if _, err := unixAddKey("user", fmt.Sprintf("%s:%s:aux", defaultKeyringPrefix, uuidDevlink), primaryKey, unix.KEY_SPEC_USER_KEYRING); err != nil {
logger.Noticef("warning: cannot register primary key for %s: %v", uuidDevlink, err)
}
}
func createBootstrappedContainerImpl(key DiskUnlockKey, devicePath string) BootstrappedContainer {
return &bootstrappedContainer{
tempContainerKeySlot: "bootstrap-key",
devicePath: devicePath,
key: key,
finished: false,
}
}
func init() {
CreateBootstrappedContainer = createBootstrappedContainerImpl
}
func MockCreateBootstrappedContainer(f func(key DiskUnlockKey, devicePath string) BootstrappedContainer) func() {
osutil.MustBeTestBinary("MockCreateBootstrappedContainer can be only called from tests")
old := CreateBootstrappedContainer
CreateBootstrappedContainer = f
return func() {
CreateBootstrappedContainer = old
}
}
|
