#!/bin/sh
#
# Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#

# PROVIDE: disks
# KEYWORD: nojail

. /etc/rc.subr

name="geli"
desc="GELI disk encryption"
start_precmd="geli_prestart"
start_cmd="geli_start"
stop_cmd="geli_stop"
required_modules="geom_eli:g_eli"

: ${geli_mount_keys_first:=NO}

geli_prestart()
{
	if checkyesno geli_mount_keys_first
	then
		if ! mount | grep -q "on /etc/keys ("
		then
			mount -r /etc/keys
		fi
	fi

	[ -n "$(geli_make_list)" -o -n "${geli_groups}" ]
	return $?
}


# Takes provider
# Reads key from EFIvar
# Returns tempfile pathname containing key
geli_efi()
{
	local provider="${1}"
	local provider_=`ltr ${provider} '/-' '_'`
	local guid="65537263-7465-654b-4f79-44666f6f216d"

	eval "efi=\${geli_${provider_}_efi:-NO}"

	if checkyesno efi
	then
		efivar="$(printf "%s-%s" "${guid}" "$(echo -n "${provider}" | sha256)")"
		tmpkey="$(mktemp "/tmp/efikey_${provider_}")"
		efivar --binary --no-name "${efivar}" > "${tmpkey}"
		if [ -s "${tmpkey}" ]
		then
			echo "${tmpkey}"
		fi
	fi
}

geli_efi_init()
{
	mount -t tmpfs tmpfs /tmp
}

geli_efi_fini()
{
	umount -t tmpfs /tmp
}

geli_start()
{
	devices=`geli_make_list`

	if [ -z "${geli_tries}" ]; then
		if [ -n "${geli_attach_attempts}" ]; then
			# Compatibility with rc.d/gbde.
			geli_tries=${geli_attach_attempts}
		else
			geli_tries=`${SYSCTL_N} kern.geom.eli.tries`
		fi
	fi

	geli_efi_init

	for provider in ${devices}; do
		provider_=`ltr ${provider} '/-' '_'`

		eval "flags=\${geli_${provider_}_flags}"
		if [ -z "${flags}" ]; then
			flags=${geli_default_flags}
		fi

		efikey="$(geli_efi "${provider}")"
		if [ -s "${efikey}" ]
		then
			echo "Acquired key for ${provider} from EFI."
			flags="${flags} -p -k ${efikey}"
		fi

		if [ -e "/dev/${provider}" -a ! -e "/dev/${provider}.eli" ]; then
			echo "Configuring Disk Encryption for ${provider}."
			count=1
			while [ ${count} -le ${geli_tries} ]; do
				geli attach ${flags} ${provider}
				if [ -e "/dev/${provider}.eli" ]; then
					break
				fi
				echo "Attach failed; attempt ${count} of ${geli_tries}."
				count=$((count+1))
			done
		fi
	done

	for group in ${geli_groups}; do
		group_=`ltr ${group} '/-' '_'`

		eval "flags=\${geli_${group_}_flags}"
		if [ -z "${flags}" ]; then
			flags=${geli_default_flags}
		fi

		eval "providers=\${geli_${group_}_devices}"
		if [ -z "${providers}" ]; then
			echo "No devices listed in geli group ${group}."
			continue
		fi

		efikey="$(geli_efi "${group}")"
		if [ -s "${efikey}" ]
		then
			echo "Acquired key for ${group} from EFI."
			flags="${flags} -p -k ${efikey}"
		fi

		if [ -e "/dev/${providers%% *}" -a ! -e "/dev/${providers%% *}.eli" ]; then
			echo "Configuring Disk Encryption for geli group ${group}, containing ${providers}."
			count=1
			while [ ${count} -le ${geli_tries} ]; do
				geli attach ${flags} ${providers}
				if [ -e "/dev/${providers%% *}.eli" ]; then
					break
				fi
				echo "Attach failed; attempt ${count} of ${geli_tries}."
				count=$((count+1))
			done
		fi
	done

	geli_efi_fini
}

geli_stop()
{
	devices=`geli_make_list`

	for group in ${geli_groups}; do
		group_=`ltr ${group} '/-' '_'`

		eval "providers=\${geli_${group_}_devices}"

		devices="${devices} ${providers}"
	done

	for provider in ${devices}; do
		if [ -e "/dev/${provider}.eli" ]; then
			umount "/dev/${provider}.eli" 2>/dev/null
			geli detach "${provider}"
		fi
	done
}

load_rc_config $name
run_rc_command "$1"