vianney / arch-luks-suspend

Lock encrypted root volume on suspend in Arch Linux

arch-luks-suspend

A script for Arch Linux to lock the encrypted root volume on suspend.

When using dm-crypt with LUKS to set up full system encryption, the encryption key is kept in memory when suspending the system. This drawback defeats the purpose of encryption if you carry around your suspended laptop a lot. One can use the cryptsetup luksSuspend command to freeze all I/O and flush the key from memory, but special care must be taken when applying it to the root device.

The arch-linux-suspend script replaces the default suspend mechanism of systemd. It changes root to initramfs in order to perform the luksSuspend, actual suspend, and luksResume operations. It relies on the shutdown initcpio hook to provide access to the initramfs.

Installation

1. Install this AUR package: https://aur.archlinux.org/packages/arch-luks-suspend-git/
   Alternatively, run make install as root.
2. Edit /etc/mkinitcpio.conf and make sure the following hooks are enabled: udev, encrypt, shutdown, suspend.
3. Rebuild the initramfs: mkinitcpio -p linux.
4. Reboot.

Author and license

Copyright 2013 Vianney le Clément de Saint-Marcq [e-mail]

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 3 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with This program. If not, see http://www.gnu.org/licenses/.