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#!/bin/sh
# Licensed under the GPLv2
#
# Copyright (C) 2011 Politecnico di Torino, Italy
# TORSEC group -- http://security.polito.it
# Roberto Sassu <roberto.sassu@polito.it>
MASTERKEYSCONFIG="${NEWROOT}/etc/sysconfig/masterkey"
MULTIKERNELMODE="NO"
PCRLOCKNUM=11
load_masterkey()
{
# read the configuration from the config file
[ -f "${MASTERKEYSCONFIG}" ] && \
. ${MASTERKEYSCONFIG}
# override the kernel master key path name from the 'masterkey=' parameter
# in the kernel command line
MASTERKEYARG=$(getarg masterkey=)
[ $? -eq 0 ] && \
MASTERKEY=${MASTERKEYARG}
# override the kernel master key type from the 'masterkeytype=' parameter
# in the kernel command line
MASTERKEYTYPEARG=$(getarg masterkeytype=)
[ $? -eq 0 ] && \
MASTERKEYTYPE=${MASTERKEYTYPEARG}
# set default values
[ -z "${MASTERKEYTYPE}" ] && \
MASTERKEYTYPE="trusted"
if [ -z "${MASTERKEY}" ]; then
# append the kernel version to the default masterkey path name
# if MULTIKERNELMODE is set to YES
if [ "${MULTIKERNELMODE}" = "YES" ]; then
MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}-$(uname -r).blob"
else
MASTERKEY="/etc/keys/kmk-${MASTERKEYTYPE}.blob"
fi
fi
# set the kernel master key path name
MASTERKEYPATH="${NEWROOT}${MASTERKEY}"
# check for kernel master key's existence
if [ ! -f "${MASTERKEYPATH}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "masterkey: kernel master key file not found: ${MASTERKEYPATH}"
fi
return 1
fi
# read the kernel master key blob
KEYBLOB=$(cat ${MASTERKEYPATH})
# add the 'load' prefix if the key type is 'trusted'
[ "${MASTERKEYTYPE}" = "trusted" ] && \
KEYBLOB="load ${KEYBLOB} pcrlock=${PCRLOCKNUM}"
# load the kernel master key
info "Loading the kernel master key"
keyctl add "${MASTERKEYTYPE}" "kmk-${MASTERKEYTYPE}" "${KEYBLOB}" @u >/dev/null || {
info "masterkey: failed to load the kernel master key: kmk-${MASTERKEYTYPE}";
return 1;
}
return 0
}
load_masterkey
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