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#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
# Licensed under the GPLv2
#
# Copyright (C) 2011 Politecnico di Torino, Italy
# TORSEC group -- http://security.polito.it
# Roberto Sassu <roberto.sassu@polito.it>
EVMSECFILE="${SECURITYFSDIR}/evm"
EVMCONFIG="${NEWROOT}/etc/sysconfig/evm"
EVMKEYDESC="evm-key"
EVMKEYTYPE="encrypted"
EVMKEYID=""
load_evm_key()
{
# read the configuration from the config file
[ -f "${EVMCONFIG}" ] && \
. ${EVMCONFIG}
# override the EVM key path name from the 'evmkey=' parameter in the kernel
# command line
EVMKEYARG=$(getarg evmkey=)
[ $? -eq 0 ] && \
EVMKEY=${EVMKEYARG}
# set the default value
[ -z "${EVMKEY}" ] && \
EVMKEY="/etc/keys/evm-trusted.blob";
# set the EVM key path name
EVMKEYPATH="${NEWROOT}${EVMKEY}"
# check for EVM encrypted key's existence
if [ ! -f "${EVMKEYPATH}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "integrity: EVM encrypted key file not found: ${EVMKEYPATH}"
fi
return 1
fi
# read the EVM encrypted key blob
KEYBLOB=$(cat ${EVMKEYPATH})
# load the EVM encrypted key
EVMKEYID=$(keyctl add ${EVMKEYTYPE} ${EVMKEYDESC} "load ${KEYBLOB}" @u)
[ $? -eq 0 ] || {
info "integrity: failed to load the EVM encrypted key: ${EVMKEYDESC}";
return 1;
}
return 0
}
unload_evm_key()
{
# unlink the EVM encrypted key
keyctl unlink ${EVMKEYID} @u || {
info "integrity: failed to unlink the EVM encrypted key: ${EVMKEYDESC}";
return 1;
}
return 0
}
enable_evm()
{
# check kernel support for EVM
if [ ! -e "${EVMSECFILE}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "integrity: EVM kernel support is disabled"
fi
return 0
fi
# load the EVM encrypted key
load_evm_key || return 1
# initialize EVM
info "Enabling EVM"
echo 1 > ${EVMSECFILE}
# unload the EVM encrypted key
unload_evm_key || return 1
return 0
}
enable_evm
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