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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>
ECRYPTFSCONFIG="${NEWROOT}/etc/sysconfig/ecryptfs"
ECRYPTFSKEYTYPE="encrypted"
ECRYPTFSKEYDESC="1000100010001000"
ECRYPTFSKEYID=""
ECRYPTFSSRCDIR="/secret"
ECRYPTFS_EXTRA_MOUNT_OPTS=""
load_ecryptfs_key() {
# override the eCryptfs key path name from the 'ecryptfskey=' parameter in the kernel
# command line
if ECRYPTFSKEYARG=$(getarg ecryptfskey=); then
ECRYPTFSKEY=${ECRYPTFSKEYARG}
fi
# set the default value
[ -z "${ECRYPTFSKEY}" ] \
&& ECRYPTFSKEY="/etc/keys/ecryptfs-trusted.blob"
# set the eCryptfs key path name
ECRYPTFSKEYPATH="${NEWROOT}${ECRYPTFSKEY}"
# check for eCryptfs encrypted key's existence
if [ ! -f "${ECRYPTFSKEYPATH}" ]; then
if [ "${RD_DEBUG}" = "yes" ]; then
info "eCryptfs: key file not found: ${ECRYPTFSKEYPATH}"
fi
return 1
fi
# read the eCryptfs encrypted key blob
read -r KEYBLOB < "${ECRYPTFSKEYPATH}"
# load the eCryptfs encrypted key blob
if ! ECRYPTFSKEYID=$(keyctl add ${ECRYPTFSKEYTYPE} ${ECRYPTFSKEYDESC} "load ${KEYBLOB}" @u); then
info "eCryptfs: failed to load the eCryptfs key: ${ECRYPTFSKEYDESC}"
return 1
fi
return 0
}
unload_ecryptfs_key() {
# unlink the eCryptfs encrypted key
keyctl unlink "${ECRYPTFSKEYID}" @u || {
info "eCryptfs: failed to unlink the eCryptfs key: ${ECRYPTFSKEYDESC}"
return 1
}
return 0
}
mount_ecryptfs() {
# read the configuration from the config file
# shellcheck disable=SC1090
[ -f "${ECRYPTFSCONFIG}" ] \
&& . "${ECRYPTFSCONFIG}"
# load the eCryptfs encrypted key
load_ecryptfs_key || return 1
# set the default value for ECRYPTFSDSTDIR
[ -z "${ECRYPTFSDSTDIR}" ] \
&& ECRYPTFSDSTDIR=${ECRYPTFSSRCDIR}
# set the eCryptfs filesystem mount point
ECRYPTFSSRCMNT="${NEWROOT}${ECRYPTFSSRCDIR}"
ECRYPTFSDSTMNT="${NEWROOT}${ECRYPTFSDSTDIR}"
# build the mount options variable
ECRYPTFS_MOUNT_OPTS="ecryptfs_sig=${ECRYPTFSKEYDESC}"
[ -n "${ECRYPTFS_EXTRA_MOUNT_OPTS}" ] \
&& ECRYPTFS_MOUNT_OPTS="${ECRYPTFS_MOUNT_OPTS},${ECRYPTFS_EXTRA_MOUNT_OPTS}"
# mount the eCryptfs filesystem
info "Mounting the configured eCryptfs filesystem"
mount -i -t ecryptfs -o${ECRYPTFS_MOUNT_OPTS} "${ECRYPTFSSRCMNT}" "${ECRYPTFSDSTMNT}" > /dev/null || {
info "eCryptfs: mount of the eCryptfs filesystem failed"
return 1
}
# unload the eCryptfs encrypted key
unload_ecryptfs_key || return 1
return 0
}
mount_ecryptfs
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