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#!/bin/bash
# Copyright 2018 The ChromiumOS Authors
# 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/uefi/keys/dir efi_glob
Sign the UEFI binaries in the target directory.
The target directory can be either the root of ESP or /boot of root filesystem.
EOF
if [[ $# -gt 0 ]]; then
error "$*"
exit 1
fi
exit 0
}
# Signs an EFI binary file, if possible.
# Args: TARGET_FILE TEMP_DIR PRIVATE_KEY SIGN_CERT VERIFY_CERT
sign_efi_file() {
local target="$1"
local temp_dir="$2"
local priv_key="$3"
local sign_cert="$4"
local verify_cert="$5"
if [[ -z "${verify_cert}" ]]; then
verify_cert="${sign_cert}"
fi
info "Signing efi file ${target}"
sudo sbattach --remove "${target}" || true
local signed_file="${temp_dir}/$(basename "${target}")"
sbsign --key="${priv_key}" --cert="${sign_cert}" \
--output="${signed_file}" "${target}" || warn "Cannot sign ${target}"
if [[ -f "${signed_file}" ]]; then
sudo cp -f "${signed_file}" "${target}"
sbverify --cert "${verify_cert}" "${target}" || die "Verification failed"
fi
}
main() {
local target_dir="$1"
local key_dir="$2"
local efi_glob="$3"
if [[ $# -ne 3 ]]; then
usage "command takes exactly 3 args"
fi
if ! type -P sbattach &>/dev/null; then
die "Cannot sign UEFI binaries (sbattach not found)."
fi
if ! type -P sbsign &>/dev/null; then
die "Cannot sign UEFI binaries (sbsign not found)."
fi
if ! type -P sbverify &>/dev/null; then
die "Cannot sign UEFI binaries (sbverify not found)."
fi
local bootloader_dir="${target_dir}/efi/boot"
local syslinux_dir="${target_dir}/syslinux"
local kernel_dir="${target_dir}"
local verify_cert="${key_dir}/db/db.pem"
if [[ ! -f "${verify_cert}" ]]; then
die "No verification cert: ${verify_cert}"
fi
local sign_cert="${key_dir}/db/db.children/db_child.pem"
if [[ ! -f "${sign_cert}" ]]; then
die "No signing cert: ${sign_cert}"
fi
local sign_key="${key_dir}/db/db.children/db_child.rsa"
if [[ ! -f "${sign_key}" ]]; then
die "No signing key: ${sign_key}"
fi
local working_dir="$(make_temp_dir)"
local efi_file
# Leave ${efi_glob} unquoted so that globbing occurs.
for efi_file in "${bootloader_dir}"/${efi_glob}; do
if [[ ! -f "${efi_file}" ]]; then
continue
fi
sign_efi_file "${efi_file}" "${working_dir}" \
"${sign_key}" "${sign_cert}" "${verify_cert}"
done
local syslinux_kernel_file
for syslinux_kernel_file in "${syslinux_dir}"/vmlinuz.?; do
if [[ ! -f "${syslinux_kernel_file}" ]]; then
continue
fi
sign_efi_file "${syslinux_kernel_file}" "${working_dir}" \
"${sign_key}" "${sign_cert}" "${verify_cert}"
done
local kernel_file="$(readlink -f "${kernel_dir}/vmlinuz")"
if [[ -f "${kernel_file}" ]]; then
sign_efi_file "${kernel_file}" "${working_dir}" \
"${sign_key}" "${sign_cert}" "${verify_cert}"
fi
}
main "$@"
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