constellation/image

Setup

• Install mkosi (from git):

  cd /tmp/
  git clone https://github.com/systemd/mkosi
  cd mkosi
  tools/generate-zipapp.sh
  cp builddir/mkosi /usr/local/bin/
  

• Install tools:

  Ubuntu / Debian

  sudo apt-get update
  sudo apt-get install --assume-yes --no-install-recommends \
      dnf \
      systemd-container \
      qemu-system-x86 \
      qemu-utils \
      ovmf \
      e2fsprogs \
      squashfs-tools \
      efitools \
      sbsigntool \
      coreutils \
      curl \
      jq \
      util-linux \
      virt-manager
  

  Fedora

  sudo dnf install -y \
      edk2-ovmf \
      systemd-container \
      qemu \
      e2fsprogs \
      squashfs-tools \
      efitools \
      sbsigntools \
      coreutils \
      curl \
      jq \
      util-linux \
      virt-manager
  

• Prepare secure boot PKI (see secure-boot/genkeys.sh)

Build

When building your first image, prepare the secure boot PKI (see secure-boot/genkeys.sh) for self-signed, locally built images.

After that, you can build the image with:

# OPTIONAL: to create a debug image, export the following line
# export BOOTSTRAPPER_BINARY=$(realpath ${PWD}/../../build/debugd)
# OPTIONAL: symlink custom path to secure boot PKI to ./pki
# ln -s /path/to/pki/folder ./pki
sudo make -j $(nproc)

Raw images will be placed in mkosi.output.<CSP>/fedora~36/image.raw.

Prepare Secure Boot

The generated images are partially signed by Microsoft (shim loader), and partially signed by Edgeless Systems (systemd-boot and unified kernel images consisting of the linux kernel, initramfs and kernel commandline).

For QEMU and Azure, you can pre-generate the NVRAM variables for secure boot. This is not necessary for GCP, as you can specify secure boot parameters via the GCP API on image creation.

libvirt / QEMU / KVM

secure-boot/generate_nvram_vars.sh mkosi.output.qemu/fedora~36/image.raw

Azure

These steps only have to performed once for a fresh set of secure boot certificates. VMGS blobs for testing and release images already exist.

First, create a disk without embedded MOK EFI variables.

# set these variables
export AZURE_SECURITY_TYPE=ConfidentialVM # or TrustedLaunch
export AZURE_RESOURCE_GROUP_NAME= # e.g. "constellation-images"

export AZURE_REGION=northeurope
export AZURE_DISK_NAME=constellation-$(date +%s)
export AZURE_SNAPSHOT_NAME=${AZURE_DISK_NAME}
export AZURE_RAW_IMAGE_PATH=${PWD}/mkosi.output.azure/fedora~36/image.raw
export AZURE_IMAGE_PATH=${PWD}/mkosi.output.azure/fedora~36/image.vhd
export AZURE_VMGS_FILENAME=${AZURE_SECURITY_TYPE}.vmgs
export BLOBS_DIR=${PWD}/blobs
upload/pack.sh azure "${AZURE_RAW_IMAGE_PATH}" "${AZURE_IMAGE_PATH}"
upload/upload_azure.sh --disk-name "${AZURE_DISK_NAME}-setup-secure-boot" ""
secure-boot/azure/launch.sh -n "${AZURE_DISK_NAME}-setup-secure-boot" -d --secure-boot true --disk-name "${AZURE_DISK_NAME}-setup-secure-boot"

Ignore the running launch script and connect to the serial console once available. The console shows the message "Verification failed: (0x1A) Security Violation". You can import the MOK certificate via the UEFI shell:

Press OK, then ENTER, then "Enroll key from disk". Select the following key: /EFI/loader/keys/auto/db.cer. Press Continue, then choose "Yes" to the question "Enroll the key(s)?". Choose reboot.

Extract the VMGS from the running VM (this includes the MOK EFI variables) and delete the VM:

secure-boot/azure/extract_vmgs.sh --name "${AZURE_DISK_NAME}-setup-secure-boot"
secure-boot/azure/delete.sh --name "${AZURE_DISK_NAME}-setup-secure-boot"

Upload to CSP

GCP

• Install gcloud and gsutil (see here)
• Login to GCP (see here)
• Choose secure boot PKI public keys (one of pki_dev, pki_test, pki_prod)
  • pki_dev can be used for local image builds
  • pki_test is used by the CI for non-release images
  • pki_prod is used for release images

# set these variables
export GCP_IMAGE_FAMILY= # e.g. "constellation"
export GCP_IMAGE_NAME= # e.g. "constellation-v1.0.0"
export PKI=${PWD}/pki

export GCP_PROJECT=constellation-images
export GCP_REGION=europe-west3
export GCP_BUCKET=constellation-images
export GCP_RAW_IMAGE_PATH=${PWD}/mkosi.output.gcp/fedora~36/image.raw
export GCP_IMAGE_FILENAME=$(date +%s).tar.gz
export GCP_IMAGE_PATH=${PWD}/mkosi.output.gcp/fedora~36/image.tar.gz
upload/pack.sh gcp ${GCP_RAW_IMAGE_PATH} ${GCP_IMAGE_PATH}
upload/upload_gcp.sh

Azure

• Install az and azcopy (see here)
• Login to Azure (see here)
• Prepare virtual machine guest state (VMGS) with customized NVRAM or use existing VMGS blob

# set these variables
export AZURE_GALLERY_NAME= # e.g. "Constellation"
export AZURE_IMAGE_DEFINITION= # e.g. "constellation"
export AZURE_IMAGE_VERSION= # e.g. "1.0.0"
export AZURE_VMGS_PATH= # e.g. "path/to/ConfidentialVM.vmgs"
export AZURE_SECURITY_TYPE=ConfidentialVM # or TrustedLaunch

export AZURE_RESOURCE_GROUP_NAME=constellation-images
export AZURE_REGION=northeurope
export AZURE_REPLICATION_REGIONS="northeurope eastus westeurope westus"
export AZURE_IMAGE_OFFER=constellation
export AZURE_SKU=constellation
export AZURE_PUBLISHER=edgelesssys
export AZURE_DISK_NAME=constellation-$(date +%s)
export AZURE_RAW_IMAGE_PATH=${PWD}/mkosi.output.azure/fedora~36/image.raw
export AZURE_IMAGE_PATH=${PWD}/mkosi.output.azure/fedora~36/image.vhd
upload/pack.sh azure "${AZURE_RAW_IMAGE_PATH}" "${AZURE_IMAGE_PATH}"
upload/upload_azure.sh -g --disk-name "${AZURE_DISK_NAME}" "${AZURE_VMGS_PATH}"