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FDE with Yubikey PBA on NixOS
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EFI_PART="$1" | |
LUKS_PART="$2" | |
EFI_MNT=/root/boot | |
mkdir "$EFI_MNT" | |
mkfs.vfat -F 32 -n uefi "$EFI_PART" | |
mount "$EFI_PART" "$EFI_MNT" | |
STORAGE=/crypt-storage/default | |
mkdir -p "$(dirname $EFI_MNT$STORAGE)" | |
nix-env -i gcc-wrapper | |
nix-env -i yubikey-personalization | |
nix-env -i openssl | |
rbtohex() { | |
( od -An -vtx1 | tr -d ' \n' ) | |
} | |
hextorb() { | |
( tr '[:lower:]' '[:upper:]' | sed -e 's/\([0-9A-F]\{2\}\)/\\\\\\x\1/gI' | xargs printf ) | |
} | |
cc -O3 -I$(find / | grep "openssl/evp\.h" | head -1 | sed -e 's|/openssl/evp\.h$||g' | tr -d '\n') \ | |
-L$(find / | grep "lib/libcrypto" | head -1 | sed -e 's|/libcrypto\..*$||g' | tr -d '\n') \ | |
$(find / | grep "pbkdf2-sha512\.c" | head -1 | tr -d '\n') -o ./pbkdf2-sha512 -lcrypto | |
SALT_LENGTH=16 | |
salt="$(dd if=/dev/random bs=1 count=$SALT_LENGTH 2>/dev/null | rbtohex)" | |
k_yubi="$(dd if=/dev/random bs=1 count=20 2>/dev/null | rbtohex)" | |
challenge="$(echo -n $salt | openssl dgst -binary -sha512 | rbtohex)" | |
response="$(echo -n $challenge | hextorb | openssl dgst -binary -sha1 -mac HMAC -macopt hexkey:$k_yubi | rbtohex)" | |
KEY_LENGTH=512 | |
ITERATIONS=1000000 | |
k_luks="$(echo | ./pbkdf2-sha512 $(($KEY_LENGTH / 8)) $ITERATIONS $response | rbtohex)" | |
CIPHER=aes-xts-plain64 | |
HASH=sha512 | |
echo -n "$k_luks" | hextorb | cryptsetup luksFormat --cipher="$CIPHER" --key-size="$KEY_LENGTH" --hash="$HASH" --key-file=- "$LUKS_PART" | |
echo -ne "$salt\n$ITERATIONS" > $EFI_MNT$STORAGE | |
SLOT=2 | |
ykpersonalize -"$SLOT" -ochal-resp -ochal-hmac -a"$k_yubi" | |
LUKSROOT=crypted | |
echo -n "$k_luks" | hextorb | cryptsetup luksOpen --key-file=- "$LUKS_PART" "$LUKSROOT" | |
umount "$EFI_MNT" | |
pvcreate "/dev/mapper/$LUKSROOT" | |
VGNAME=cryptedpool | |
vgcreate "$VGNAME" "/dev/mapper/$LUKSROOT" | |
lvcreate -L 24G -n swap "$VGNAME" | |
FSROOT=root | |
lvcreate -l 100%FREE -n "$FSROOT" "$VGNAME" | |
vgchange -ay | |
mkfs.ext4 -L "$FSROOT" "/dev/$VGNAME/$FSROOT" | |
mkswap -L swap "/dev/$VGNAME/swap" | |
mount "/dev/$VGNAME/$FSROOT" /mnt | |
mkdir /mnt/boot | |
mount "$EFI_PART" /mnt/boot | |
swapon "/dev/$VGNAME/swap" |
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