feat: encrypted root + swap

bootstrap.sh

@@ -5,6 +5,7 @@ do case $opt in
        p) PASSWD=${OPTARG} ;;
        n) NAME=${OPTARG} ;;
        d) DEV=${OPTARG} ;;
+       e) ENC=${OPTARG} ;;
        \?) echo "-$OPTARG is not valid" >&2 && exit ;;
    esac
 done
@@ -20,6 +21,8 @@ init() {
     [ -z "$DEV" ] && lsblk -nrpo "name,size,model" && read -p "Provide installation medium (e.g. sda, nvme0n1): " DEV
     [[ "$DEV" =~ sd[a-z] ]] && SUF="1-3" && MODE="SATA"
     [[ "$DEV" =~ nvme[0-9]n[0-9] ]] && SUF="p1-3" && MODE="NVME"
+    [ -z "$ENC" ] && read -p "Do you want the root partition to be encrypted (y/n)? " ENC
+    [ "$ENC" -eq "y" ] && ENC=true || ENC=false
 
     echo "+---------------------+"
     echo "| Archlinux Bootstrap |"
@@ -27,17 +30,32 @@ init() {
     echo    "HOSTNAME    = $NAME"
     echo    "ROOTPASSWD  = ${PASSWD:0:1}***${PASSWD: -1}"
     echo    "DEVICEPARTS = $DEV$SUF"
-    read -p "Do you want to continue with these values (y/n): " cont
+    echo    "ENCRYPTION  = $ENC"
+    read -p "Do you want to continue with these values (y/n)? " cont
     [ ! "$cont" = "y" ] && unset NAME PASSWD DEV && init
     echo "Let's GOOOO"
 }
 
+crypt_prepare_disk() {
+    cryptsetup open --type plain -d /dev/urandom $1 wipe_me
+    dd if=/dev/zero of=/dev/mapper/wipe_me bs=1M status=progress
+    cryptsetup close wipe_me
+}
+
+crypt_create_fs() {
+    cryptsetup -y -v luksFormat $1
+    cryptsetup open $1 root
+    mkfs.ext4 /dev/mapper/root
+}
+
 # stop on error
 set -e
 
 # initialize important values
 init
 
+[ "$ENC" == true ] && crypt_prepare_disk "/dev/$DEV"
+
 # All values set, start bootstrapping
 gdisk /dev/$DEV <<EOF
 o
@@ -62,25 +80,35 @@ y
 
 EOF
 
-case $MODE in
-    "NVME")
-        mkfs.fat -F 32 -n P_EFI /dev/${DEV}p1
-        mkfs.ext4 -L P_ROOT /dev/${DEV}p3
-        mkswap -L P_SWAP /dev/${DEV}p2
-        ;;
-    "SATA")
-        mkfs.fat -F 32 -n P_EFI /dev/${DEV}1
-        mkfs.ext4 -L P_ROOT /dev/${DEV}3
-        mkswap -L P_SWAP /dev/${DEV}2
-        ;;
-esac
-
-mount -L P_ROOT /mnt        # root
+[ $MODE == "NVME" ] && suffix="p" || suffix=""
+
+mkfs.fat -F 32 -n P_EFI "/dev/$DEV$suffix1"
+if [ "$ENC" == true ]; then
+    crypt_create_fs "/dev/$DEV$suffix3"
+    mkfs.ext2 -L cryptswap "/dev/$DEV$suffixp2" 1M # Otherwise label will be lost after reboot
+else
+    mkfs.ext4 -L P_ROOT "/dev/$DEV$suffix3"
+    mkswap -L P_SWAP "/dev/$DEV$suffix2"
+fi
+
+
+ROOT_UUID=$(blkid | grep -Po '/dev/'"$DEV$suffix"'3.* UUID="\K[0-9a-f-]+')
+SWAP_UUID=$(blkid | grep -Po '/dev/'"$DEV$suffix"'2.* UUID="\K[0-9a-f-]+')
+
+if [ "$ENC" == true ]; then
+    mount /dev/mapper/root /mnt
+    KERNEL_OPTIONS='cryptdevice=UUID='"$ROOT_UUID"':root root=/dev/mapper/root'
+else
+    mount -L P_ROOT /mnt
+    KERNEL_OPTIONS='root=LABEL=P_ROOT rw resume=LABEL=P_SWAP'
+fi
+
 mkdir -p /mnt/boot
 mount -L P_EFI /mnt/boot   # EFI
-swapon -L P_SWAP # swap
 
-sed -e '/## Germany/,+1!d' /etc/pacman.d/mirrorlist
+[ "$ENC" == false ] && swapon -L P_SWAP # swap
+
+sed -i '/## Germany/,+1!d' /etc/pacman.d/mirrorlist
 
 # for server dhcpcd and other programs are not required -> see good2know
 pacstrap /mnt base base-devel linux-zen linux-firmware vi dhcpcd wpa_supplicant dialog git netctl curl
@@ -88,6 +116,14 @@ genfstab -p /mnt > /mnt/etc/fstab
 
 cat <<EOF > /mnt/root/bootstrap2.sh
 #!/bin/bash
+
+if [ $ENC == true ]; then
+    sed -i 's/\(^HOOKS.*block\)/\1 encrypt/' /etc/mkinitcpio.conf
+    ct_entry="swap LABEL=cryptswap /dev/urandom swap,offset=2048,cipher=aes-xts-plain64,size=512"
+    echo $ct_entry >> /etc/crypttab
+    echo "/dev/mapper/swap none swap defaults 0 0" >> /etc/fstab
+fi
+
 ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime
 
 echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
@@ -106,17 +142,16 @@ cat <<EEE > /boot/loader/entries/arch-uefi.conf
 title	Arch
 linux	/vmlinuz-linux-zen
 initrd	/initramfs-linux-zen.img
-options	root=LABEL=P_ROOT rw resume=LABEL=P_SWAP
+options $KERNEL_OPTIONS
 EEE
 
 cat <<EEE > /boot/loader/entries/arch-uefi-fallback.conf
 title    Arch Linux Fallback
 linux    /vmlinuz-linux-zen
 initrd   /initramfs-linux-zen-fallback.img
-options	root=LABEL=P_ROOT rw resume=LABEL=P_SWAP
+options $KERNEL_OPTIONS
 EEE
 
-
 cat <<EEE > /boot/loader/loader.conf
 default   arch-uefi
 timeout   1
@@ -139,4 +174,4 @@ chmod u+x /mnt/root/bootstrap2.sh
 arch-chroot /mnt /root/bootstrap2.sh
 rm /mnt/root/bootstrap2.sh
 
-reboot
+# reboot