Add chapter prepare YubiKey

book/arch/02-prepare-disk.md

@@ -2,9 +2,20 @@
 
 You have [different choices](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system "dm-crypt/Encrypting an entire system") to setup encryption.
 This chapter describes [LVM on LUKS with encrypted boot partition](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Encrypted_boot_partition_.28GRUB.29 "Encrypted boot partition (GRUB)").
+Because we want to unlock all volumes at once.
 
 List your disks with `lsblk` and run `gdisk /dev/[your disk]` e.g. `gdisk /dev/nvme0n1`. You can take a look at the 
 `gdisk` Arch Wiki [en](https://wiki.archlinux.org/index.php/Fdisk#gdisk) / [de](https://wiki.archlinux.de/title/GPT#Partitionieren_mit_gdisk)
 
 > It's crucial to use `gdisk` because GPT is needed for UEFI boot.
 
+Please create 4 partition like described in the Arch Wiki above with `gdisk`. Use the codes for the partition type.
+Don't format the partitions at this time, we will do it later with the YubiKey.
+
+The second partition contains the EFI System and must be of type FAT32. Format the second partition e.g. `/dev/nvme0n1p2` with: 
+
+```
+mkfs.fat -F32 /dev/[your disk partition 2]
+```
+
+The next chapter describes how to prepare the YubiKey.

book/arch/03-prepare-yubikey.md

@@ -1,3 +1,81 @@
 # Prepare YubiKey
 
-TBD
+Download or mount [yubikey-full-disk-encryption](https://github.com/agherzan/yubikey-full-disk-encryption) and install it
+in your Arch Linux Live environment. This is needed because we will format the 4rd partition with YubiKey.
+
+Open the yubikey-full-disk-encryption folder and run `make`.
+
+```
+cd yubikey-full-disk-encryption
+make install
+```
+
+Now it's time prepare the second slot of our YubiKey for the challenge response authentication. Touch will be also enabled.
+
+```
+ykpersonalize -v -2 -ochal-resp -ochal-hmac -ohmac-lt64 -ochal-btn-trig -oserial-api-visible
+```
+
+Open `/etc/ykfde.conf` and set `YKFDE_CHALLENGE_SLOT=2` because we want to use the second slot. 
+Set `YKFDE_CHALLENGE_PASSWORD_NEEDED=1` so it asks for the password (2FA). Feel free to modify it tou your needs 
+e.g. enable TRIM (but be warned, there are potential security implications) support.
+
+> Please compare it carefully with the latest version you have downloaded.
+
+```ini
+# Configuration for yubikey-full-disk-encryption. ("") means an empty value.
+
+### *REQUIRED* ###
+
+# Set to non-empty value to use 'Automatic mode with stored challenge (1FA)'.
+#YKFDE_CHALLENGE=""
+
+# Use 'Manual mode with secret challenge (2FA)'.
+YKFDE_CHALLENGE_PASSWORD_NEEDED="1"
+
+# Choose YubiKey slot configured for 'HMAC-SHA1 Challenge-Response' mode. Possible values are "1" or "2".
+YKFDE_CHALLENGE_SLOT="2"
+
+### OPTIONAL ###
+
+# Set partition UUID. Leave empty to use 'cryptdevice' kernel parameter.
+#YKFDE_DISK_UUID=""
+
+# Set LUKS encrypted volume name. Leave empty to use 'cryptdevice' kernel parameter.
+#YKFDE_LUKS_NAME=""
+
+# If left empty this will be set as "/dev/disk/by-uuid/$YKFDE_DISK_UUID" -- device to unlock with 'cryptsetup luksOpen'.
+#YKFDE_LUKS_DEV=""
+
+# Optional flags passed to 'cryptsetup luksOpen'. Example: "--allow-discards" for TRIM support. Leave empty to use cryptdevice kernel parameter.
+#YKFDE_LUKS_OPTIONS=""
+
+# Number of times to assemble passphrase and run 'cryptsetup luksOpen'. Defaults to "5".
+#YKFDE_CRYPTSETUP_TRIALS="5"
+
+# Number of seconds to wait for inserting YubiKey, "-1" means 'unlimited'. Defaults to "30".
+#YKFDE_CHALLENGE_YUBIKEY_INSERT_TIMEOUT="30"
+
+# Number of seconds passed to 'sleep' after succesful decryption. Defaults to empty, meaning NO sleep.
+#YKFDE_SLEEP_AFTER_SUCCESSFUL_CRYPTSETUP=""
+
+# Enable verbose output. It will print all secrets to terminal. Use only for debugging.
+#DBG="1"
+```
+
+Next step is to format the 4rd partition. You can modify the arguments if you know what you are doing. 
+Ensure that you use the 4rd partition e.g. `nvme0n1p4`
+
+```
+ykfde-format --cipher aes-xts-plain64 --key-size 512 --hash sha256 --iter-time 5000 --type luks2 /dev/[device 4rd partition]
+ykfde-open -d /dev/[device 4rd partition] -n cryptlvm
+```
+
+Display the crypt volume with `ls /dev/mapper`. Next step is to [preparing the logical volumes](https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system#Preparing_the_logical_volumes "preparing the logical volumes")
+for `/` and `/home` directory.
+
+```
+mount /dev/MyVolGroup/root /mnt
+mkdir /mnt/home
+mount /dev/MyVolGroup/home /mnt/home
+```