86 lines
3.4 KiB
Markdown
86 lines
3.4 KiB
Markdown
# Prepare YubiKey
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Download or mount [yubikey-full-disk-encryption](https://github.com/agherzan/yubikey-full-disk-encryption) and install it
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in your Arch Linux Live environment. This is needed because we will format the 4th partition with YubiKey.
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## Installation
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Open the *yubikey-full-disk-encryption* folder and run `make`.
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```
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cd yubikey-full-disk-encryption
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make install
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```
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## Prepare 2nd slot
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Now it's time to prepare the second slot of your YubiKey for the [challenge response authentication](https://wiki.archlinux.org/index.php/yubikey#Challenge-Response "Setup YubiKey Challenge-Response").
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Touch will be also enabled. You can also install the package `yubikey-personalization-gui`. It allows for customization of the secret key,
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creation of secret key backup and writing the same secret key to multiple YubiKeys which allows for using them interchangeably for creating
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same *ykfde* passphrases.
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> Securely save the 20 byte length secret key from the output, so you can use it to initialize another YubiKey as backup.
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```
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ykpersonalize -v -2 -ochal-resp -ochal-hmac -ohmac-lt64 -ochal-btn-trig -oserial-api-visible
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```
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## Configure ykfde
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Open `/etc/ykfde.conf` and set `YKFDE_CHALLENGE_SLOT=2` because we want to use the second slot.
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Set `YKFDE_CHALLENGE_PASSWORD_NEEDED=1` so it asks for the password (2FA). Leave other settings as is, it will be changed
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later.
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> Please compare it carefully with the latest version you have downloaded.
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```ini
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# Configuration for yubikey-full-disk-encryption. ("") means an empty value.
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### *REQUIRED* ###
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# Set to non-empty value to use 'Automatic mode with stored challenge (1FA)'.
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#YKFDE_CHALLENGE=""
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# Use 'Manual mode with secret challenge (2FA)'.
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YKFDE_CHALLENGE_PASSWORD_NEEDED="1"
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# Choose YubiKey slot configured for 'HMAC-SHA1 Challenge-Response' mode. Possible values are "1" or "2".
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YKFDE_CHALLENGE_SLOT="2"
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### OPTIONAL ###
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# Set partition UUID. Leave empty to use 'cryptdevice' kernel parameter.
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#YKFDE_DISK_UUID=""
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# Set LUKS encrypted volume name. Leave empty to use 'cryptdevice' kernel parameter.
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#YKFDE_LUKS_NAME=""
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# If left empty this will be set as "/dev/disk/by-uuid/$YKFDE_DISK_UUID" -- device to unlock with 'cryptsetup luksOpen'.
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#YKFDE_LUKS_DEV=""
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# Optional flags passed to 'cryptsetup luksOpen'. Example: "--allow-discards" for TRIM support. Leave empty to use cryptdevice kernel parameter.
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#YKFDE_LUKS_OPTIONS=""
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# Number of times to assemble passphrase and run 'cryptsetup luksOpen'. Defaults to "5".
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#YKFDE_CRYPTSETUP_TRIALS="5"
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# Number of seconds to wait for inserting YubiKey, "-1" means 'unlimited'. Defaults to "30".
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#YKFDE_CHALLENGE_YUBIKEY_INSERT_TIMEOUT="30"
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# Number of seconds passed to 'sleep' after succesful decryption. Defaults to empty, meaning NO sleep.
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#YKFDE_SLEEP_AFTER_SUCCESSFUL_CRYPTSETUP=""
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# Enable verbose output. It will print all secrets to terminal. Use only for debugging.
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#DBG="1"
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```
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## Encrypt 4th partition
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Next step is to format the 4th partition. You can modify the arguments if you know what you are doing.
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> Ensure that you use the 4th partition, replace `[device 4th partition]` with the 4th partition of your device e.g. `nvme0n1p4`
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```
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ykfde-format --cipher aes-xts-plain64 --key-size 512 --hash sha256 --iter-time 5000 --type luks2 /dev/[device 4th partition]
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ykfde-open -d /dev/[device 4th partition] -n cryptlvm
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```
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Display the crypt volume with `ls -la /dev/mapper/`. Next step is to prepare the logical volumes.
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