2022-10-18 10:23:00 -04:00
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#!/usr/bin/env bash
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# Copyright (c) Edgeless Systems GmbH
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#
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# SPDX-License-Identifier: AGPL-3.0-only
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# This script is used to precalculate the PCR[4] value for a Constellation OS image.
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# Usage: precalculate_pcr_4.sh <path to image> <path to output file>
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set -euo pipefail
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source "$(dirname "$0")/measure_util.sh"
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ev_efi_action_sha256=3d6772b4f84ed47595d72a2c4c5ffd15f5bb72c7507fe26f2aaee2c69d5633ba
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ev_efi_separator_sha256=df3f619804a92fdb4057192dc43dd748ea778adc52bc498ce80524c014b81119
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authentihash () {
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local path="$1"
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"$(dirname "$0")/extract_authentihash.py" "${path}"
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}
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write_output () {
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local out="$1"
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cat > "${out}" <<EOF
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{
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"pcr4": "${expected_pcr_4}",
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"efistages": [
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{
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"name": "shim",
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"sha256": "${shim_authentihash}"
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},
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{
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"name": "systemd-boot",
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"sha256": "${sd_boot_authentihash}"
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},
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{
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"name": "uki",
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"sha256": "${uki_authentihash}"
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}
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]
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}
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EOF
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}
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DIR=$(mktempdir)
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trap 'cleanup "${DIR}"' EXIT
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extract "$1" "/efi/EFI/BOOT/BOOTX64.EFI" "${DIR}/01-shim.efi"
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extract "$1" "/efi/EFI/BOOT/grubx64.efi" "${DIR}/02-sd-boot.efi"
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extract "$1" "/efi/EFI/Linux" "${DIR}/uki"
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sudo chown -R "$USER:$USER" "${DIR}/uki"
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cp ${DIR}/uki/*.efi "${DIR}/03-uki.efi"
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shim_authentihash=$(authentihash "${DIR}/01-shim.efi")
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sd_boot_authentihash=$(authentihash "${DIR}/02-sd-boot.efi")
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uki_authentihash=$(authentihash "${DIR}/03-uki.efi")
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cleanup "${DIR}"
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expected_pcr_4=0000000000000000000000000000000000000000000000000000000000000000
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expected_pcr_4=$(pcr_extend "${expected_pcr_4}" "${ev_efi_action_sha256}" "sha256sum")
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expected_pcr_4=$(pcr_extend "${expected_pcr_4}" "${ev_efi_separator_sha256}" "sha256sum")
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expected_pcr_4=$(pcr_extend "${expected_pcr_4}" "${shim_authentihash}" "sha256sum")
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expected_pcr_4=$(pcr_extend "${expected_pcr_4}" "${sd_boot_authentihash}" "sha256sum")
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expected_pcr_4=$(pcr_extend "${expected_pcr_4}" "${uki_authentihash}" "sha256sum")
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echo "Authentihashes:"
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echo "Stage 1 – shim: ${shim_authentihash}"
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echo "Stage 2 – sd-boot: ${sd_boot_authentihash}"
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echo "Stage 3 – Unified Kernel Image (UKI): ${uki_authentihash}"
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echo ""
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echo "Expected PCR[4]: ${expected_pcr_4}"
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2022-10-12 06:13:41 -04:00
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echo ""
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2022-10-18 10:23:00 -04:00
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write_output "$2"
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