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99 lines
2.7 KiB
99 lines
2.7 KiB
14 years ago
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#!/bin/sh
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# Licensed under the GPLv2
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#
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# Copyright (C) 2011 Politecnico di Torino, Italy
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# TORSEC group -- http://security.polito.it
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# Roberto Sassu <roberto.sassu@polito.it>
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ECRYPTFSCONFIG="${NEWROOT}/etc/sysconfig/ecryptfs"
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ECRYPTFSKEYTYPE="encrypted"
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ECRYPTFSKEYDESC="1000100010001000"
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ECRYPTFSKEYID=""
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ECRYPTFSSRCDIR="/secret"
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ECRYPTFS_EXTRA_MOUNT_OPTS=""
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load_ecryptfs_key()
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{
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# override the eCryptfs key path name from the 'ecryptfskey=' parameter in the kernel
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# command line
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ECRYPTFSKEYARG=$(getarg ecryptfskey=)
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[ $? -eq 0 ] && \
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ECRYPTFSKEY=${ECRYPTFSKEYARG}
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# set the default value
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[ -z "${ECRYPTFSKEY}" ] && \
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ECRYPTFSKEY="/etc/keys/ecryptfs-trusted.blob";
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# set the eCryptfs key path name
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ECRYPTFSKEYPATH="${NEWROOT}${ECRYPTFSKEY}"
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# check for eCryptfs encrypted key's existence
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if [ ! -f "${ECRYPTFSKEYPATH}" ]; then
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if [ "${RD_DEBUG}" = "yes" ]; then
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info "eCryptfs: key file not found: ${ECRYPTFSKEYPATH}"
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fi
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return 1
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fi
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# read the eCryptfs encrypted key blob
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KEYBLOB=$(cat ${ECRYPTFSKEYPATH})
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# load the eCryptfs encrypted key blob
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ECRYPTFSKEYID=$(keyctl add ${ECRYPTFSKEYTYPE} ${ECRYPTFSKEYDESC} "load ${KEYBLOB}" @u)
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[ $? -eq 0 ] || {
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info "eCryptfs: failed to load the eCryptfs key: ${ECRYPTFSKEYDESC}";
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return 1;
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}
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return 0
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}
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unload_ecryptfs_key()
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{
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# unlink the eCryptfs encrypted key
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keyctl unlink ${ECRYPTFSKEYID} @u || {
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info "eCryptfs: failed to unlink the eCryptfs key: ${ECRYPTFSKEYDESC}";
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return 1;
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}
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return 0
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}
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mount_ecryptfs()
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{
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# read the configuration from the config file
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[ -f "${ECRYPTFSCONFIG}" ] && \
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. ${ECRYPTFSCONFIG}
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# load the eCryptfs encrypted key
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load_ecryptfs_key || return 1
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# set the default value for ECRYPTFSDSTDIR
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[ -z "${ECRYPTFSDSTDIR}" ] && \
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ECRYPTFSDSTDIR=${ECRYPTFSSRCDIR}
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# set the eCryptfs filesystem mount point
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ECRYPTFSSRCMNT="${NEWROOT}${ECRYPTFSSRCDIR}"
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ECRYPTFSDSTMNT="${NEWROOT}${ECRYPTFSDSTDIR}"
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# build the mount options variable
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ECRYPTFS_MOUNT_OPTS="ecryptfs_sig=${ECRYPTFSKEYDESC}"
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[ ! -z "${ECRYPTFS_EXTRA_MOUNT_OPTS}" ] && \
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ECRYPTFS_MOUNT_OPTS="${ECRYPTFS_MOUNT_OPTS},${ECRYPTFS_EXTRA_MOUNT_OPTS}"
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# mount the eCryptfs filesystem
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info "Mounting the configured eCryptfs filesystem"
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mount -i -t ecryptfs -o${ECRYPTFS_MOUNT_OPTS} ${ECRYPTFSSRCMNT} ${ECRYPTFSDSTMNT} >/dev/null || {
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info "eCryptfs: mount of the eCryptfs filesystem failed";
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return 1;
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}
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# unload the eCryptfs encrypted key
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unload_ecryptfs_key || return 1
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return 0
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}
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mount_ecryptfs
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