Linux Kernel Runtime Guard (LKRG) in Qubes OS Debian or Kicksecure for Qubes VMs

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HowTo: Install LKRG in Qubes Debian or Kicksecure for Qubes Template

Linux Kernel Runtime Guard (LKRG) protects the kernel. It provides security through diversity and has a similar effect to running an uncommon operating system (kernel). [1]

LKRG renders whole classes of kernel exploits ineffective, while making other exploits less reliable and more difficult to write; see features and security. LKRG was developed by a security professional with reviews undertaken by other high profile security professionals; see authorship. For further information, refer to the main LKRG entry.

The instructions below explain how to install LKRG in Qubes Debian-based VMs. Most users will want to apply these instructions in the Qubes Debian Template.

Kicksecure for Qubes is supported as well, but in that case the steps to add the signing key and repository should be skipped because they are already present in Kicksecure for Qubes.

For all other platforms , see LKRG.

Qubes VM Kernel[edit]

Since LKRG is a kernel module, it is required (and advisable) to reconfigure the VM to use a Qubes VM kernel. [2]

Any issues with Qubes VM kernel should not be confused with LKRG. Otherwise, LKRG could be falsely suspected of causing unrelated issues, which wastes time in successfully completing the configuration.

  1. Follow the Qubes OS Installing kernel in Debian VMarchive.org instructions.
  2. Ensure the Qubes VM kernel is functional before proceeding -- Qubes VM kernel issues should be raised at Qubes supportarchive.org and not in Kicksecure forums. [3] [4]
  3. Reboot dom0 with Qubes VM kernel. This is because Qubes VM kernel might break unrelated things such as the USB VM. [5]
  4. Once the Qubes VM kernel is functional, proceed with the following instructions.


Add Repository[edit]

Info Skip this step in Kicksecure for Qubes.

There are two different options to enable the Kicksecure APT repository.

Using extrepo

1. Install package extrepo.

sudo apt install extrepo

2. Enable the stable kicksecure APT repository. (See footnote for other options.) [6]

A : Kicksecure

===

Kicksecure

sudo extrepo enable kicksecure

B : Kicksecure for Qubes Template

===

Kicksecure for Qubes Template (kicksecure-17)

sudo http_proxy=http://127.0.0.1:8082 https_proxy=http://127.0.0.1:8082 extrepo enable kicksecure

3. Advanced options.

For advanced options such as clearnet over Tor or onion. [7]

Please press on expand on the right side.

Optional.

Install apt-transport-tor.

Install apt-transport-tor. To accomplish that, the following steps A. to D. need to be done.

A. Update the package lists.

sudo apt update

B. Upgrade the system.

sudo apt full-upgrade

C. Install the apt-transport-tor package.

Using apt command line parameter --no-install-recommends is in most cases optional.

sudo apt install --no-install-recommends apt-transport-tor

D. Done.

The procedure of installing apt-transport-tor is complete.

Find out filename.

ls -la /etc/apt/sources.list.d/extrepo_*

NOTE: Filename will be different if using a repository other than the stable repository such as the testers repository.

Open file /etc/apt/sources.list.d/extrepo_kicksecure.sources in an editor with root rights.

Kicksecure

This box uses sudoedit for better security.

Kicksecure for Qubes

NOTE: When using Kicksecure for Qubes, this needs to be done inside the Template.

Others and Alternatives

  • This is just an example. Other tools could achieve the same goal.
  • If this example does not work for you or if you are not using Kicksecure, please refer to this link.

sudoedit /etc/apt/sources.list.d/extrepo_kicksecure.sources

Chose either option A) or B).

  • A) Clearnet over Tor Repository: To enable clearnet over Tor, tor+ needs do be prepended in front of the https. The same in other words, look for Uris: https and replace it with Uris: tor+https .
  • B) Onion Repository: To enable onion, look for the line starting with Uris:. Delete the whole line. Or out-comment it by adding as hash ("#") in front of it. Then add a new line: Uris: tor+http://deb.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion

4. Done.

The Kicksecure APT repository has been enabled [8]

Manually

Add Signing Key

Complete the following steps to add the Kicksecure Signing Key to the system's APT keyring.

Open a terminal.

1. Package curl needs to be installed.

Install curl. To accomplish that, the following steps A. to D. need to be done.

A. Update the package lists.

sudo apt update

B. Upgrade the system.

sudo apt full-upgrade

C. Install the curl package.

Using apt command line parameter --no-install-recommends is in most cases optional.

sudo apt install --no-install-recommends curl

D. Done.

The procedure of installing curl is complete.

2. Download Kicksecure Signing Key. [9]

A : Debian

If you are using Debian, run.

TLS

sudo curl --tlsv1.3 --output /usr/share/keyrings/derivative.asc --url https://www.kicksecure.com/keys/derivative.asc

onion

Downloading over onion requires an already functional system Tor.

sudo torsocks curl --output /usr/share/keyrings/derivative.asc --url http://www.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion/keys/derivative.asc

B : Qubes

If you are using a Qubes Debian Template, run.

TLS

sudo http_proxy=http://127.0.0.1:8082 https_proxy=http://127.0.0.1:8082 curl --tlsv1.3 --output /usr/share/keyrings/derivative.asc --url https://www.kicksecure.com/keys/derivative.asc

onion

Downloading over onion requires an already functional system Tor.

sudo torsocks curl --output /usr/share/keyrings/derivative.asc --url http://www.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion/keys/derivative.asc

3. Users can check Kicksecure Signing Key for better security.

4. Done.

The procedure of adding the Kicksecure signing key is now complete.

Add Repository

Add the Kicksecure APT Repository.

Choose either: Option A, Option B OR Option C

A : Onion Rep.

Option A: Add Kicksecure Onion Repository.

To add Kicksecure Repository over Onion please install apt-transport-tor from the Debian repository.

sudo apt install apt-transport-tor

Add Kicksecure APT repository for default Kicksecure using Debian stable. At the time of writing this was bookworm.

echo "deb [signed-by=/usr/share/keyrings/derivative.asc] tor+http://deb.w5j6stm77zs6652pgsij4awcjeel3eco7kvipheu6mtr623eyyehj4yd.onion bookworm main contrib non-free" | sudo tee /etc/apt/sources.list.d/derivative.list

B : Clearnet Rep. via Tor

Option B: Add Kicksecure Clearnet Repository over Tor.

To add Kicksecure Repository over torified clearnet install apt-transport-tor from the Debian repository.

sudo apt install apt-transport-tor

Add Kicksecure APT repository for default Kicksecure using Debian stable. At the time of writing this was bookworm.

echo "deb [signed-by=/usr/share/keyrings/derivative.asc] tor+https://deb.kicksecure.com bookworm main contrib non-free" | sudo tee /etc/apt/sources.list.d/derivative.list

C : Clearnet Rep.

Option C: Add Kicksecure Clearnet Repository over clearnet.

NOTE: When later using Kicksecure repository tool, then this will be upgraded to "Clearnet Rep. via Tor", unless see footnote. [10]

To add Kicksecure Repository over clearnet please add Kicksecure APT repository for default Kicksecure using Debian stable. At the time of writing this was bookworm.

echo "deb [signed-by=/usr/share/keyrings/derivative.asc] https://deb.kicksecure.com bookworm main contrib non-free" | sudo tee /etc/apt/sources.list.d/derivative.list

The procedure of adding the Kicksecure repository is now complete.

Install LKRG[edit]

Testers only! Warning: This is for testers-only!

Install LKRG.

Install lkrg-dkms linux-headers-amd64. To accomplish that, the following steps A. to D. need to be done.

A. Update the package lists.

sudo apt update

B. Upgrade the system.

sudo apt full-upgrade

C. Install the lkrg-dkms linux-headers-amd64 package.

Using apt command line parameter --no-install-recommends is in most cases optional.

sudo apt install --no-install-recommends lkrg-dkms linux-headers-amd64

D. Done.

The procedure of installing lkrg-dkms linux-headers-amd64 is complete.

The LKRG installation procedure is complete. Interested users can learn more, consider additional hardening and so on; see here for further information.

Credits and Source Code[edit]

The originalarchive.org source software is maintained by Adam "pi3" Zabrocki. See also: LKRG authorship.

This website with Qubes instructions and LKRG Debian Package Website is the software forkarchive.org homepage for LKRG, with a focus on easy installation, added user documentation, and integration with Kicksecure, Debian, Whonix and other distributions. The software fork source code can be found herearchive.org.

References[edit]

Qubes ticket: make Linux Kernel Runtime Guard (LKRG) easily avaialble in Qubesarchive.org

  1. ↑ https://lkrg.org/archive.org
  2. ↑ cannot compile LKRG (Linux Kernel Runtime Guard) with Qubes dom0 kernel / broken gcc plugins structleak_plugin.so latent_entropy_plugin.soarchive.org This probably occurs due to this recently closed issue which has only filtered through to Qubes OS master branches, but not the stable branches: kernel-devel package have broken gcc pluginarchive.org. The dom0 kernel compilation bug might be fixed after upgrades. It is unclear if it would then be advisable to use dom0 kernel.
  3. ↑ https://forums.whonix.org/t/what-to-post-in-this-qubes-whonix-forum-and-what-not/2275archive.org
  4. ↑ Qubes feature request: Simplify and promote using in-vm kernelarchive.org
  5. ↑ As experienced firsthand by Kicksecure developer Patrick Schleizer.
  6. ↑ stable-proposed-updates repository: sudo extrepo enable kicksecure_proposed testers repository: sudo extrepo enable kicksecure_testers developers repository: sudo extrepo enable kicksecure_developers
  7. ↑ extrepo feature request: extrepo apt-transport-tor and onion supportarchive.org
  8. ↑ forum discussion: extrepo - safely adding reposarchive.org
  9. ↑ See Secure Downloads to understand why curl and the parameters --tlsv1.3 are used instead of wget.

    Placing an additional signing key into folder /usr/share/keyrings by itself alone has no impact on security as this folder is not automatically used by Debian's APT by default. Only when an APT sources list configuration file points to folder /usr/share/keyrings using the signed-by keyword the signing key will be actually used. Therefore deleting keys in /usr/share/keyrings is optional if intending to disable an APT repository. See also APT Signing Key Folders.
  10. ↑ Unless using repository-dist --transport plain-tls. See also man repository-dist.

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