A minimal Linux that runs as a coreboot or LinuxBoot ROM payload to provide a secure, flexible boot environment for laptops, workstations and servers.
Go to file
Jonathon Hall 215ff2a397
reboot, poweroff: Prepare TPM2 for shutdown
TPM2 must be prepared for shutdown, or it may track an auth failure for
dictionary attack prevention (per the spec, to prevent an attack by
attempting to authenticate and then powering off the TPM before it can
update the nonvolatile counter).

Add tpmr shutdown to prepare for shutdown (no-op on TPM1).  Invoke it
from poweroff and reboot.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
2023-03-08 16:20:21 -05:00
.circleci Merge pull request from rbreslow/rb/support-t440p 2023-02-28 15:23:16 -05:00
.github/ISSUE_TEMPLATE Update coreboot versions in build issues template 2022-09-08 23:22:26 -04:00
bin build: Allow injecting GPG key at build time 2022-08-24 13:04:06 -04:00
blobs Add T440p blobs documentation 2023-02-28 11:58:34 -05:00
boards modules/bash: enabled by default, disabled in legacy-flash boards 2023-03-08 12:45:52 -05:00
build porting Makefile to use a modular build system for each package 2016-08-02 19:25:47 -04:00
config modules/bash: Include bash in all builds, remove CONFIG_BASH 2023-03-08 12:45:52 -05:00
initrd reboot, poweroff: Prepare TPM2 for shutdown 2023-03-08 16:20:21 -05:00
install ignore everything in install/ 2018-02-05 16:04:23 -05:00
modules tpmtotp: Update to branch including tpm pcrread 2023-03-08 12:45:56 -05:00
packages ignore fetched files 2016-08-02 21:24:15 -04:00
patches tpm2-tools: Remove curl dependency 2023-03-08 12:45:44 -05:00
.gitattributes Add overrides for Makefile syntax highlighting 2023-01-18 11:51:38 -05:00
.gitignore fix install directory handling for git and builds 2018-11-23 12:29:08 -05:00
.gitlab-ci.yml.deprecated Merge pull request from Tonux599/kgpe-d16_411_measured-boot 2020-12-02 18:23:55 -05:00
COPYING Add GPL license (issue ) 2017-02-26 10:53:11 -05:00
FAQ.md FAQ: Fix spelling of *convenience* 2018-08-09 23:37:18 +02:00
Makefile Makefile: Bring back bash in bin_modules 2023-03-08 12:45:52 -05:00
README.md README: point to https://osresearch.net again (DNS name renewed) 2023-02-08 11:32:50 -05:00

Heads booting on an x230

Heads: the other side of TAILS

Heads is a configuration for laptops and servers that tries to bring more security to commodity hardware. Among its goals are:

  • Use free software on the boot path
  • Move the root of trust into hardware (or at least the ROM bootblock)
  • Measure and attest to the state of the firmware
  • Measure and verify all filesystems

Flashing Heads into the boot ROM

NOTE: It is a work in progress and not yet ready for non-technical users. If you're interested in contributing, please get in touch. Installation requires disassembly of your laptop or server, external SPI flash programmers, possible risk of destruction and significant frustration.

More information is available in the 33C3 presentation of building "Slightly more secure systems".

Documentation

Please refer to Heads-wiki for your Heads' documentation needs.

Building heads

make BOARD=board_name where board_name is the name of the board directory under ./boards directory.

In order to build reproducible firmware images, Heads builds a specific version of gcc and uses it to compile the Linux kernel and various tools that go into the initrd. Unfortunately this means the first step is a little slow since it will clone the musl-cross-make tree and build gcc...

Once that is done, the top level Makefile will handle most of the remaining details -- it downloads the various packages, verifies the hashes, applies Heads specific patches, configures and builds them with the cross compiler, and then copies the necessary parts into the initrd directory.

There are still dependencies on the build system's coreutils in /bin and /usr/bin/, but any problems should be detectable if you end up with a different hash than the official builds.

The various components that are downloaded are in the ./modules directory and include:

We also recommend installing Qubes OS, although there Heads can kexec into any Linux or multiboot kernel.

Notes:

  • Building coreboot's cross compilers can take a while. Luckily this is only done once.
  • Builds are finally reproducible! The reproduciblebuilds tag tracks any regressions.
  • Currently only tested in QEMU, the Thinkpad x230, Librem series and the Chell Chromebook. ** Xen does not work in QEMU. Signing, HOTP, and TOTP do work; see below.
  • Building for the Lenovo X220 requires binary blobs to be placed in the blobs/x220/ folder. See the readme.md file in that folder
  • Building for the Librem 13 v2/v3 or Librem 15 v3/v4 requires binary blobs to be placed in the blobs/librem_skl folder. See the readme.md file in that folder

QEMU:

OS booting can be tested in QEMU using a software TPM. HOTP can be tested by forwarding a USB token from the host to the guest.

For more information and setup instructions, refer to the qemu-coreboot-fbwhiptail-tpm1-hotp documentation.

coreboot console messages

The coreboot console messages are stored in the CBMEM region and can be read by the Linux payload with the cbmem --console | less command. There is lots of interesting data about the state of the system.