Difference between revisions of "Encrypted Root"

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(Undo revision 34521 by Funtoomademe42percent (talk))
(Tag: Undo)
(clean up the build, add crypto label, and set crypto label in grub, hopefully were not FORCED into the known working uuid grub configuration.)
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This howto describes how to setup a swapless encrypted root partition without llvm.
+
This document describes how to setup a swapless encrypted root partition without lvm.
{{warning|out of order}}
 
{{warning|This build is currently broken}}
 
  
 
== Prepare the hard drive and partitions ==
 
== Prepare the hard drive and partitions ==
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== Encrypt the drive ==
 
== Encrypt the drive ==
 
{{console|body=
 
{{console|body=
# ##i##cryptsetup luksFormat /dev/sdc3
+
###i## cryptsetup luksFormat --type luks2 --label=FUNTOO /dev/sdc3
 
}}
 
}}
*enter your password
+
* YES not yes....
 +
*enter your password:
  
 
== Initialize the volume ==
 
== Initialize the volume ==
 
Initialize the volume:
 
Initialize the volume:
 +
 
{{console|body=
 
{{console|body=
# ##i##cryptsetup luksOpen /dev/sdc3 dmcrypt_root
+
###i## cryptsetup luksOpen /dev/sdc3 dmcrypt_root
 
}}
 
}}
  
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###i## mkfs.vfat -F 32 /dev/sdc2
 
###i## mkfs.vfat -F 32 /dev/sdc2
 
###i## fatlabel /dev/sdc2 "BOOT"
 
###i## fatlabel /dev/sdc2 "BOOT"
# ##i##mkfs.ext4 /dev/mapper/dmcrypt_root
+
###i## mkfs.ext4 /dev/mapper/dmcrypt_root
 
}}
 
}}
  
=== Basic system setup ===
+
=== Mount ===
 
{{console|body=
 
{{console|body=
# ##i##mkdir /mnt/funtoo
+
###i## mkdir /mnt/funtoo
# ##i##mount /dev/mapper/dmcrypt_root /mnt/funtoo
+
###i## mount /dev/mapper/dmcrypt_root /mnt/funtoo
# ##i##mkdir  /mnt/funtoo/boot
+
###i## mkdir  /mnt/funtoo/boot
# ##i##mount /dev/sdc2 /mnt/funtoo/boot
+
###i## mount /dev/sdc2 /mnt/funtoo/boot
 
}}
 
}}
  
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tmpfs /run tmpfs rw,nodev,nosuid 0 0
 
tmpfs /run tmpfs rw,nodev,nosuid 0 0
 
EOF
 
EOF
 +
}}
 +
 +
*load your crypttab:
 +
{{console|body=
 +
###i## echo "dmcrypt_root PARTLABEL=FUNTOO none luks" >> /etc/crypttab
 +
###i## dmsetup table >> /etc/dmtab
 
}}
 
}}
  
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{{console|body=
 
{{console|body=
 
###i## echo 'PORTAGE_TMPDIR="/run"' > /etc/portage/make.conf
 
###i## echo 'PORTAGE_TMPDIR="/run"' > /etc/portage/make.conf
 +
}}
 +
 +
*Sync & deploy your profile:
 +
{{console|body=
 +
###i## ego sync && ego profile mix-in encrypted-root
 
}}
 
}}
  
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{{console|body=
 
{{console|body=
 
###i## cat > /etc/portage/package.use << "EOF"
 
###i## cat > /etc/portage/package.use << "EOF"
sys-kernel/debian-sources luks
+
*/* lvm device-mapper
sys-kernel/debian-sources-lts luks
 
sys-boot/grub device-mapper
 
 
sys-kernel/linux-firmware initramfs
 
sys-kernel/linux-firmware initramfs
 
EOF
 
EOF
 
}}
 
}}
  
*merge stuff:
 
 
{{console|body=
 
{{console|body=
###i## ego sync
+
###i## emerge grub haveged intel-microcode linux-firmware eix cryptsetup debian-sources-lts && emerge debian-sources && emerge -vuND @world && emerge --depclean
 
}}
 
}}
  
*Deploy your ego profile:
 
{{console|body=
 
###i## ego profile mix-in encrypted-root
 
}}
 
 
{{console|body=
 
###i## emerge grub haveged intel-microcode linux-firmware eix cryptsetup debian-sources-lts && emerge debian-sources && emerge -vuND @world
 
}}
 
 
*set services:
 
*set services:
 
{{console|body=
 
{{console|body=
 
###i## rc-update del swap boot && rc-update add haveged && rc-update add gpm && rc-update add busybox-ntpd
 
###i## rc-update del swap boot && rc-update add haveged && rc-update add gpm && rc-update add busybox-ntpd
###i## rc-update add device-mapper sysinit
+
###i## rc-update add device-mapper boot
###i## rc-update add dmcrypt sysinit
+
###i## rc-update add dmcrypt boot
 
}}
 
}}
  
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kernel kernel[-v]
 
kernel kernel[-v]
 
initrd initramfs[-v]
 
initrd initramfs[-v]
   params += crypt_root=PARTLABEL=FUNTOO lvm luks root=/dev/mapper/dmcrypt_root rootfstype=ext4
+
   params += crypt_root=LABEL=FUNTOO dolvm luks=yes root=/dev/mapper/dmcrypt_root rootfstype=ext4
 
}
 
}
</pre>
 
 
Now, run <code>ego boot update</code> to write the configuration files to <code>/boot/grub/grub.cfg</code>
 
 
=== Another Example ===
 
Configure the bootloader as described above, with correct kernel and initramfs images names. An example for grub2. You will be editing <code>/etc/boot.conf</code>:
 
 
<pre>
 
boot {
 
  generate grub
 
  default "Funtoo Linux"
 
  timeout 3
 
}
 
"Funtoo Linux" {
 
kernel kernel[-v]
 
initrd initramfs[-v]
 
  params += crypt_root=PARTLABEL=FUNTOO dolvm real_root=/dev/mapper/dmcrypt_root  rootfstype=ext4
 
 
</pre>
 
</pre>
  
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###i## grub-install --target=x86_64-efi /boot/efi
 
###i## grub-install --target=x86_64-efi /boot/efi
 
}}
 
}}
 +
 
=== EFI from EFI ===
 
=== EFI from EFI ===
 
 
{{console|body=
 
{{console|body=
 
###i##mount -o remount,rw /sys/firmware/efi/efivars
 
###i##mount -o remount,rw /sys/firmware/efi/efivars
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== Final steps ==
 
== Final steps ==
exit chroot, unmount everything, close encrypted drive and reboot
+
*exit chroot, unmount everything,and close encrypted root:
 
{{console|body=
 
{{console|body=
 
###i## exit
 
###i## exit
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# ##i##cryptsetup luksClose dmcrypt_root
 
# ##i##cryptsetup luksClose dmcrypt_root
 
}}
 
}}
After reboot you will get the following:
 
<console>
 
>>> better-initramfs started. Kernel version 2.6.35-gentoo-r10
 
>>> Create all the symlinks to /bin/busybox.
 
>>> Initiating /dev/dir
 
>>> Getting LVM volumes up (if any)
 
Reding all physical volumes. This make take awhile...
 
No volume group found
 
No volume group found
 
>>> Opening encrypted partition and mapping to /dev/mapper/dmcrypt_root
 
Enter passphrase fore /dev/sda2:
 
</console>
 
Type your password
 
 
<console>
 
>>> Again, getting LVM volumes up (if any, after map dmcrypt).
 
  Reading all physical volumes.  This may take a while...
 
  Found volume group "vg" using metadata type lvm2
 
  4 logical volume(s) in volume group "vg" now active
 
>>> Mounting rootfs to /newroot
 
>>> Umounting /sys and /proc.
 
>>> Switching root to /newroot and executing /sbin/init.
 
INIT: version 2.88 booting
 
Loading /libexec/rc/console/keymap
 
  OpenRC 0.6.1 is starting up Funtoo Linux (x86_64)
 
...boot messages omitted for clarity
 
 
 
orion login: oleg
 
Password:
 
Last login: Thu Oct 14 20:49:21 EEST 2010 on tty1
 
oleg@orion ~ %
 
</console>
 
  
 
==management==
 
==management==
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{{console|body=
 
{{console|body=
# ##i##cryptsetup luksChangeKey /dev/sda3
+
###i## cryptsetup luksChangeKey /dev/sda3
 
}}
 
}}
  
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You will not be asked to confirm your new passphrase, so be careful when running this operation.
 
You will not be asked to confirm your new passphrase, so be careful when running this operation.
  
 
+
== External Resources ==
== Additional links and information ==
 
 
* [[gentoo-wiki:Root filesystem over LVM2, DM-Crypt and RAID|Root filesystem over LVM2, DM-Crypt, and RAID]]
 
* [[gentoo-wiki:Root filesystem over LVM2, DM-Crypt and RAID|Root filesystem over LVM2, DM-Crypt, and RAID]]
 
* [http://wiki.archlinux.org/index.php/System_Encryption_with_LUKS_for_dm-crypt System Encryption with LUKS for dm-crypt]
 
* [http://wiki.archlinux.org/index.php/System_Encryption_with_LUKS_for_dm-crypt System Encryption with LUKS for dm-crypt]

Revision as of 16:50, November 30, 2020

This document describes how to setup a swapless encrypted root partition without lvm.

Prepare the hard drive and partitions

  • List the device to be partitioned, mine is on /dev/sdc
root # lsblk -o name,size,label,partlabel

Partition

root # cgdisk /dev/sdc

delete everything.

Command:  new ↵
First sector: 
Last sector: +1M ↵
Hex Code: EF02 ↵
Enter name: BIOS Boot ↵

scroll down to large chunk of free space:

Command: new ↵
First sector: 
Last sector: +128M ↵
Hex Code: EF00 ↵
Enter name: BOOT ↵

scroll down to large chunk of free space:

Command: new ↵
First sector: 
Last sector: 
Hex Code:  8304 ↵
Enter name: FUNTOO ↵
Disk Drive: /dev/sdc
                            Size: 62333952, 29.7 GiB

Part. #     Size        Partition Type            Partition Name
----------------------------------------------------------------
            1007.0 KiB  free space
   1        1024.0 KiB  BIOS boot partition	  BIOS Boot
   2        256.0 MiB   EFI System                BOOT
   3        29.5 GiB    Linux x86-64 root (/)     FUNTOO
Command: write ↵
Command: quit ↵

Encrypt the drive

root # cryptsetup luksFormat --type luks2 --label=FUNTOO /dev/sdc3
  • YES not yes....
  • enter your password:

Initialize the volume

Initialize the volume:

root # cryptsetup luksOpen /dev/sdc3 dmcrypt_root

Create your filesystem

root # mkfs.vfat -F 32 /dev/sdc2
root # fatlabel /dev/sdc2 "BOOT"
root # mkfs.ext4 /dev/mapper/dmcrypt_root

Mount

root # mkdir /mnt/funtoo
root # mount /dev/mapper/dmcrypt_root /mnt/funtoo
root # mkdir  /mnt/funtoo/boot
root # mount /dev/sdc2 /mnt/funtoo/boot

Get Funtoo Gnome

You can pull your Subarches gnome tarball if you wish:

root # cd /mnt/funtoo
root # wget https://build.funtoo.org/1.4-release-std/x86-64bit/generic_64/gnome-latest.tar.xz
root # tar --numeric-owner --xattrs --xattrs-include='*' -xpf *gnome* && rm -f *gnome*

Load Funtoo

  • expand your run tmpfs to be half of your ram:
root # mount -t tmpfs tmpfs /run
  • mount up:
root # cd /mnt/funtoo && mount -t proc none proc
mount --rbind /sys sys
mount --rbind /dev dev
mount --rbind /run run
  • chroot in:
root # cd /mnt/funtoo && env -i HOME=/root TERM=$TERM chroot . bash -l
  • Set yo password:
  • set yo hostname:
  • set cloudflare dns resolution for installing:
  • Set yo time zone:
root # passwd
root # echo 'hostname="crypto"' > /etc/conf.d/hostname
root # echo "nameserver 1.1.1.1" > /etc/resolv.conf
root # ln -sf /usr/share/zoneinfo/America/Detroit /etc/localtime

load your fstab

  • Deploy your fstab:
root # cat > /etc/fstab << "EOF"
LABEL=BOOT /boot vfat noauto,noatime 1 2
/dev/mapper/dmcrypt_root / ext4 noatime,nodiratime,defaults 0 1
tmpfs /run tmpfs rw,nodev,nosuid 0 0
EOF
  • load your crypttab:
root # echo "dmcrypt_root PARTLABEL=FUNTOO none luks" >> /etc/crypttab
root # dmsetup table >> /etc/dmtab
  • compile in ram:
root # echo 'PORTAGE_TMPDIR="/run"' > /etc/portage/make.conf
  • Sync & deploy your profile:
root # ego sync && ego profile mix-in encrypted-root
  • Deploy your package.use file:
root # cat > /etc/portage/package.use << "EOF"
*/* lvm device-mapper
sys-kernel/linux-firmware initramfs
EOF
root # emerge grub haveged intel-microcode linux-firmware eix cryptsetup debian-sources-lts && emerge debian-sources && emerge -vuND @world && emerge --depclean
  • set services:
root # rc-update del swap boot && rc-update add haveged && rc-update add gpm && rc-update add busybox-ntpd
root # rc-update add device-mapper boot
root # rc-update add dmcrypt boot

Bootloader Configuration

/etc/boot.conf

boot {
  generate grub
  default "Funtoo Linux"
  timeout 3
}
"Funtoo Linux" {
	kernel kernel[-v]
	initrd initramfs[-v]
  params += crypt_root=LABEL=FUNTOO dolvm luks=yes root=/dev/mapper/dmcrypt_root rootfstype=ext4
}

GRUB

  • Install grub in legacy mode:
root # grub-install --target=i386-pc /dev/sdc 
root # ego boot update

EFI from Legacy

  • manually make efi directory:
  • remount /dev/sdc2 to /boot/efi:
  • install efi images:
root # mkdir /boot/efi
root # mount /dev/sdc2 /boot/efi
root # grub-install --target=x86_64-efi /boot/efi

EFI from EFI

root #mount -o remount,rw /sys/firmware/efi/efivars
root #grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id="Funtoo Linux [GRUB]" --recheck /dev/sda
root #ego boot update

Final steps

  • exit chroot, unmount everything,and close encrypted root:
root # exit
root # cd ..
root # umount -lR funtoo
root # cryptsetup luksClose dmcrypt_root

management

Change your LUKs-encrypted drive's passphrase

You may want to change your encrypted volume’s passphrase or password from time to time. To do so, run the following commands in the console as root:

root # cryptsetup luksChangeKey /dev/sda3

You'll be prompted to enter in the existing passphrase first, then to enter in your new passphrase. You will not be asked to confirm your new passphrase, so be careful when running this operation.

External Resources