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#!/bin/bash
# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
. "$(dirname "$0")/common.sh"
set -e
usage() {
cat <<EOF
Usage: $PROG /path/to/target/dir /path/to/esp/dir /path/to/uefi/keys/dir
Verify signatures of UEFI binaries in the target directory.
EOF
if [[ $# -gt 0 ]]; then
error "$*"
exit 1
fi
exit 0
}
main() {
local target_dir="$1"
local esp_dir="$2"
local key_dir="$3"
if [[ $# -ne 3 ]]; then
usage "command takes exactly 3 args"
fi
if ! type -P sbverify &>/dev/null; then
die "Cannot verify UEFI signatures (sbverify not found)."
fi
local bootloader_dir="${target_dir}/efi/boot"
local syslinux_dir="${target_dir}/syslinux"
local kernel_dir="${target_dir}"
local gsetup_dir="${esp_dir}/EFI/Google/GSetup"
if [[ ! -f "${gsetup_dir}/pk/pk.der" ]]; then
die "No PK cert"
fi
local db_cert_der="${gsetup_dir}/db/db.der"
if [[ ! -f "${db_cert_der}" ]]; then
die "No DB cert"
fi
local cert="${key_dir}/db/db.pem"
local working_dir="$(make_temp_dir)"
local gsetup_cert="${working_dir}/cert.pem"
openssl x509 -in "${db_cert_der}" -inform DER \
-out "${gsetup_cert}" -outform PEM
for efi_file in "${bootloader_dir}"/*.efi; do
if [[ ! -f "${efi_file}" ]]; then
continue
fi
sbverify --cert "${cert}" "${efi_file}" ||
die "Verification failed. file:${efi_file} cert:${cert}"
sbverify --cert "${gsetup_cert}" "${efi_file}" ||
die "Verification failed. file:${efi_file} cert:${gsetup_cert}"
done
for syslinux_kernel_file in "${syslinux_dir}"/vmlinuz.?; do
if [[ ! -f "${syslinux_kernel_file}" ]]; then
continue
fi
sbverify --cert "${cert}" "${syslinux_kernel_file}" ||
warn "Verification failed. file:${syslinux_kernel_file} cert:${cert}"
sbverify --cert "${gsetup_cert}" "${syslinux_kernel_file}" ||
warn "Verification failed. file:${syslinux_kernel_file}" \
"cert:${gsetup_cert}"
done
local kernel_file="$(readlink -f "${kernel_dir}/vmlinuz")"
if [[ -f "${kernel_file}" ]]; then
sbverify --cert "${cert}" "${kernel_file}" ||
warn "Verification failed: file:${kernel_file} cert:${cert}"
sbverify --cert "${gsetup_cert}" "${kernel_file}" ||
warn "Verification failed: file:${kernel_file} cert:${gsetup_cert}"
fi
}
main "$@"
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