blob: adc07cc77c400b784a03bfb0f519b06746a607c5 (
about) (
plain) (
blame)
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
|
Full disk encryption with Yubikey (Yubico key) for mkinitcpio
=============================================================
This allows to automatically unlock a LUKS encrypted hard disk from `systemd`-
enabled initramfs.
Requirements
------------
To compile and use yubikey full disk encryption you need:
* [yubikey-personalization](https://github.com/Yubico/yubikey-personalization)
* [iniparser](http://ndevilla.free.fr/iniparser/)
* [systemd](http://www.freedesktop.org/wiki/Software/systemd/)
* [cryptsetup](http://code.google.com/p/cryptsetup/)
* keyutils and linux with `CONFIG_KEYS`
* [mkinitcpio](https://projects.archlinux.org/mkinitcpio.git/)
* [markdown](http://daringfireball.net/projects/markdown/) (HTML documentation)
* [libarchive](http://www.libarchive.org/) (Update challenge on boot)
Additionally it is expected to have `make` and `pkg-config` around to
successfully compile.
Build and install
-----------------
Building and installing is very easy. Just run:
> make
followed by:
> make install-mkinitcpio
This will place files to their desired places in filesystem.
Usage
-----
### config files `/etc/crypttab.initramfs` and `/etc/ykfde.conf`
Make sure systemd knows about your encrypted device by
adding a line to `/etc/crypttab.initramfs`. It should read like:
> `mapping-name` /dev/`LUKS-device` -
Usually there is already an entry for your device.
Update `/etc/ykfde.conf` with correct settings. Add `mapping-name` from
above to `device name` in the `general` section. Then add a new section
with your key's decimal serial number containing the key slot setting.
The minimal file should look like this:
[general]
device name = crypt
[1234567]
luks slot = 1
*Be warned*: Do not remove or overwrite your interactive key! Keep that
for backup and rescue!
### key setup
`ykfde` will read its information from these files and understands some
additional options. Run `ykfde --help` for details. Then prepare
the key. Plug it in, make sure it is configured for `HMAC-SHA1`.
After that run:
> ykfde
This will store a challenge in `/etc/ykfde.d/` and add a new slot to
your LUKS device. When `ykfde` asks for a passphrase it requires a valid
passphrase from available slot.
Alternatively, adding a key with second factor is as easy:
> ykfde --new-2nd-factor 2nd-factor
To update the challenge run:
> ykfde --2nd-factor 2nd-factor
And changing second factor is straight forward:
> ykfde --2nd-factor current-2nd-factor --new-2nd-factor new-2nd-factor
The second factor can be read from terminal, increasing security by not
displaying on display and not writing to shell history. Use switches
`--ask-2nd-factor` and `--ask-new-2nd-factor` for that.
Make sure to enable second factor in `/etc/ykfde.conf`.
### cpio archive with challenges
Every time you update a challenge and/or a second factor run:
> ykfde-cpio
This will write a cpio archive `/boot/ykfde-challenges.img` containing
your current challenges. Enable systemd service `ykfde` to do this
automatically on every boot:
> systemctl enable ykfde.service
### mkinitcpio hook `ykfde`
Last add `ykfde` to your hook list in `/etc/mkinitcpio.conf`. You should
already have `systemd` and `sd-encrypt` there as a `systemd`-enabled
initramfs is prerequisite. Now rebuild your initramfs with:
> mkinitcpio -p linux
### boot loader
Update you `grub` configuration by running:
> grub-mkconfig -o /boot/grub/grub.cfg
This will add new boot entry that loads the challenges. With other boot
loaders make sure to load the cpio archive `/boot/ykfde-challenges.img`
as additional initramfs.
Reboot and have fun!
|