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https://github.com/edgelesssys/constellation.git
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7ab23c28b8
This reverts commit ec1d5e9fb5.
While the change enabled shasum calculation on mac, it broke it
on some Linux distros.
60 lines
1.4 KiB
Bash
Executable File
60 lines
1.4 KiB
Bash
Executable File
#!/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[9] value for a Constellation OS image.
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# PCR[9] contains the hash of the initrd and is measured by the linux kernel after loading the initrd.
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# Usage: precalculate_pcr_9.sh <path to image> <path to output file>
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set -euo pipefail
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shopt -s inherit_errexit
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source "$(dirname "$0")/measure_util.sh"
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get_initrd_from_uki() {
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local uki="$1"
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local output="$2"
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objcopy -O binary --only-section=.initrd "${uki}" "${output}"
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}
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initrd_measure() {
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local path="$1"
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sha256sum "${path}" | cut -d " " -f 1
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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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"measurements": {
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"9": {
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"expected": "${expected_pcr_9}"
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}
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},
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"initrd-sha256": "${initrd_hash}"
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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 "$1" "/efi/EFI/Linux" "${DIR}/uki"
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sudo chown -R "${USER}:${USER}" "${DIR}/uki"
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cp "${DIR}"/uki/*.efi "${DIR}/03-uki.efi"
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get_initrd_from_uki "${DIR}/03-uki.efi" "${DIR}/initrd"
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initrd_hash=$(initrd_measure "${DIR}/initrd")
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cleanup "${DIR}"
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expected_pcr_9=0000000000000000000000000000000000000000000000000000000000000000
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expected_pcr_9=$(pcr_extend "${expected_pcr_9}" "${initrd_hash}" "sha256sum")
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echo "Initrd measurement ${initrd_hash}"
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echo ""
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echo "Expected PCR[9]: ${expected_pcr_9}"
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echo ""
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write_output "$2"
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