336 lines
8.5 KiB
Plaintext
336 lines
8.5 KiB
Plaintext
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#!/sbin/runscript
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# Copyright 1999-2015 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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# $Id$
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depend() {
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before checkfs fsck
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if grep -qs ^swap= "${conf_file}" ; then
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before swap
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fi
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}
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# We support multiple dmcrypt instances based on $SVCNAME
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conf_file="/etc/conf.d/${SVCNAME}"
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# Get splash helpers if available.
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if [ -e /sbin/splash-functions.sh ] ; then
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. /sbin/splash-functions.sh
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fi
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# Setup mappings for an individual target/swap
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# Note: This relies on variables localized in the main body below.
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dm_crypt_execute() {
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local dev ret mode foo
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if [ -z "${target}" -a -z "${swap}" ] ; then
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return
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fi
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# Handle automatic look up of the source path.
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if [ -z "${source}" -a -n "${loop_file}" ] ; then
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source=$(losetup --show -f "${loop_file}")
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fi
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case ${source} in
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*=*)
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source=$(blkid -l -t "${source}" -o device)
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;;
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esac
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if [ -z "${source}" ] || [ ! -e "${source}" ] ; then
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ewarn "source \"${source}\" for ${target} missing, skipping..."
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return
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fi
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if [ -n "${target}" ] ; then
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# let user set options, otherwise leave empty
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: ${options:=' '}
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elif [ -n "${swap}" ] ; then
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if cryptsetup isLuks ${source} 2>/dev/null ; then
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ewarn "The swap you have defined is a LUKS partition. Aborting crypt-swap setup."
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return
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fi
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target=${swap}
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# swap contents do not need to be preserved between boots, luks not required.
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# suspend2 users should have initramfs's init handling their swap partition either way.
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: ${options:='-c aes -h sha1 -d /dev/urandom'}
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: ${pre_mount:='mkswap ${dev}'}
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fi
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if [ -n "${loop_file}" ] ; then
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dev="/dev/mapper/${target}"
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ebegin " Setting up loop device ${source}"
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losetup ${source} ${loop_file}
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fi
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# cryptsetup:
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# open <device> <name> # <device> is $source
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# create <name> <device> # <name> is $target
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local arg1="create" arg2="${target}" arg3="${source}"
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if cryptsetup isLuks ${source} 2>/dev/null ; then
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arg1="open"
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arg2="${source}"
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arg3="${target}"
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fi
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# Older versions reported:
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# ${target} is active:
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# Newer versions report:
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# ${target} is active[ and is in use.]
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if cryptsetup status ${target} | egrep -q ' is active' ; then
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einfo "dm-crypt mapping ${target} is already configured"
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return
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fi
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splash svc_input_begin ${SVCNAME} >/dev/null 2>&1
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# Handle keys
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if [ -n "${key}" ] ; then
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read_abort() {
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# some colors
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local ans savetty resettty
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[ -z "${NORMAL}" ] && eval $(eval_ecolors)
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einfon " $1? (${WARN}yes${NORMAL}/${GOOD}No${NORMAL}) "
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shift
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# This is ugly as s**t. But POSIX doesn't provide `read -t`, so
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# we end up having to implement our own crap with stty/etc...
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savetty=$(stty -g)
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resettty='stty ${savetty}; trap - EXIT HUP INT TERM'
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trap 'eval "${resettty}"' EXIT HUP INT TERM
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stty -icanon
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[ "${1}" = -t ] && stty min 0 time "$(( $2 * 10 ))"
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ans=$(dd count=1 bs=1 2>/dev/null) || ans=''
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eval "${resettty}"
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if [ -z "${ans}" ] ; then
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printf '\r'
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else
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echo
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fi
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case ${ans} in
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[yY]) return 0;;
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*) return 1;;
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esac
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}
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# Notes: sed not used to avoid case where /usr partition is encrypted.
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mode=${key##*:} && ( [ "${mode}" = "${key}" ] || [ -z "${mode}" ] ) && mode=reg
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key=${key%:*}
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case "${mode}" in
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gpg|reg)
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# handle key on removable device
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if [ -n "${remdev}" ] ; then
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# temp directory to mount removable device
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local mntrem="${RC_SVCDIR}/dm-crypt-remdev.$$"
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if [ ! -d "${mntrem}" ] ; then
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if ! mkdir -p "${mntrem}" ; then
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ewarn "${source} will not be decrypted ..."
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einfo "Reason: Unable to create temporary mount point '${mntrem}'"
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return
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fi
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fi
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i=0
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einfo "Please insert removable device for ${target}"
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while [ ${i} -lt ${dmcrypt_max_timeout:-120} ] ; do
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foo=""
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if mount -n -o ro "${remdev}" "${mntrem}" 2>/dev/null >/dev/null ; then
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# keyfile exists?
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if [ ! -e "${mntrem}${key}" ] ; then
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umount -n "${mntrem}"
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rmdir "${mntrem}"
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einfo "Cannot find ${key} on removable media."
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read_abort "Abort" ${read_timeout:--t 1} && return
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else
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key="${mntrem}${key}"
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break
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fi
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else
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[ -e "${remdev}" ] \
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&& foo="mount failed" \
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|| foo="mount source not found"
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fi
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: $((i += 1))
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read_abort "Stop waiting after $i attempts (${foo})" -t 1 && return
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done
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else # keyfile ! on removable device
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if [ ! -e "${key}" ] ; then
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ewarn "${source} will not be decrypted ..."
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einfo "Reason: keyfile ${key} does not exist."
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return
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fi
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fi
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;;
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*)
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ewarn "${source} will not be decrypted ..."
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einfo "Reason: mode ${mode} is invalid."
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return
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;;
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esac
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else
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mode=none
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fi
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ebegin " ${target} using: ${options} ${arg1} ${arg2} ${arg3}"
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if [ "${mode}" = "gpg" ] ; then
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: ${gpg_options:='-q -d'}
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# gpg available ?
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if command -v gpg >/dev/null ; then
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for i in 0 1 2 ; do
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# paranoid, don't store key in a variable, pipe it so it stays very little in ram unprotected.
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# save stdin stdout stderr "values"
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gpg ${gpg_options} ${key} 2>/dev/null | cryptsetup --key-file - ${options} ${arg1} ${arg2} ${arg3}
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ret=$?
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[ ${ret} -eq 0 ] && break
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done
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eend ${ret} "failure running cryptsetup"
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else
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ewarn "${source} will not be decrypted ..."
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einfo "Reason: cannot find gpg application."
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einfo "You have to install app-crypt/gnupg first."
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einfo "If you have /usr on its own partition, try copying gpg to /bin ."
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fi
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else
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if [ "${mode}" = "reg" ] ; then
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cryptsetup ${options} -d ${key} ${arg1} ${arg2} ${arg3}
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ret=$?
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eend ${ret} "failure running cryptsetup"
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else
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cryptsetup ${options} ${arg1} ${arg2} ${arg3}
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ret=$?
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eend ${ret} "failure running cryptsetup"
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fi
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fi
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if [ -d "${mntrem}" ] ; then
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umount -n ${mntrem} 2>/dev/null >/dev/null
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rmdir ${mntrem} 2>/dev/null >/dev/null
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fi
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splash svc_input_end ${SVCNAME} >/dev/null 2>&1
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if [ ${ret} -ne 0 ] ; then
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cryptfs_status=1
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else
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if [ -n "${pre_mount}" ] ; then
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dev="/dev/mapper/${target}"
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eval ebegin \"" pre_mount: ${pre_mount}"\"
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eval "${pre_mount}" > /dev/null
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ewend $? || cryptfs_status=1
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fi
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fi
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}
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# Lookup optional bootparams
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get_bootparam_val() {
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# We're given something like:
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# foo=bar=cow
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# Return the "bar=cow" part.
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case $1 in
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*\=*)
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local key=$(echo "$1" | cut -f1 -d=)
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echo "$1" | cut -c $(( ${#key} + 2 ))
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;;
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esac
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}
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start() {
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local header=true cryptfs_status=0
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local gpg_options key loop_file target targetline options pre_mount post_mount source swap remdev
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local x
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for x in $(cat /proc/cmdline) ; do
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case "${x}" in
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key_timeout\=*)
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local KEY_TIMEOUT=$(get_bootparam_val "${x}")
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if [ ${KEY_TIMEOUT} -gt 0 ] ; then
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read_timeout="-t ${KEY_TIMEOUT}"
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fi
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;;
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esac
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done
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while read targetline <&3 ; do
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case ${targetline} in
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# skip comments and blank lines
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""|"#"*) continue ;;
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# skip service-specific openrc configs #377927
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rc_*) continue ;;
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esac
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${header} && ebegin "Setting up dm-crypt mappings"
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header=false
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# check for the start of a new target/swap
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case ${targetline} in
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target=*|swap=*)
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# If we have a target queued up, then execute it
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dm_crypt_execute
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# Prepare for the next target/swap by resetting variables
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unset gpg_options key loop_file target options pre_mount post_mount source swap remdev
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;;
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gpg_options=*|remdev=*|key=*|loop_file=*|options=*|pre_mount=*|post_mount=*|source=*)
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if [ -z "${target}${swap}" ] ; then
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ewarn "Ignoring setting outside target/swap section: ${targetline}"
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continue
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fi
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;;
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dmcrypt_max_timeout=*)
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# ignore global options
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continue
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;;
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*)
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ewarn "Skipping invalid line in ${conf_file}: ${targetline}"
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;;
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esac
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# Queue this setting for the next call to dm_crypt_execute
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eval "${targetline}"
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done 3< ${conf_file}
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# If we have a target queued up, then execute it
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dm_crypt_execute
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ewend ${cryptfs_status} "Failed to setup dm-crypt devices"
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}
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stop() {
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local line header
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# Break down all mappings
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header=true
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egrep "^(target|swap)=" ${conf_file} | \
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while read line ; do
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${header} && einfo "Removing dm-crypt mappings"
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header=false
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target= swap=
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eval ${line}
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[ -n "${swap}" ] && target=${swap}
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if [ -z "${target}" ] ; then
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ewarn "invalid line in ${conf_file}: ${line}"
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continue
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fi
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ebegin " ${target}"
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cryptsetup remove ${target}
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eend $?
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done
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# Break down loop devices
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header=true
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grep '^source=./dev/loop' ${conf_file} | \
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while read line ; do
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${header} && einfo "Detaching dm-crypt loop devices"
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header=false
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source=
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eval ${line}
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ebegin " ${source}"
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losetup -d "${source}"
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eend $?
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done
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return 0
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}
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