Subject: [alpine-devel] [PATCH] main/cryptsetup: add support for dmcrypt at boot

From: Roger Newman <[email-masked]>
Date: Wed, 8 Oct 2014 13:11:22 +0200

modified:   APKBUILD
	new file:   dmcrypt.confd
	new file:   dmcrypt.rc
---
 main/cryptsetup/APKBUILD      |  18 ++-
 main/cryptsetup/dmcrypt.confd |  98 ++++++++++++
 main/cryptsetup/dmcrypt.rc    | 350 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 463 insertions(+), 3 deletions(-)
 create mode 100644 main/cryptsetup/dmcrypt.confd
 create mode 100644 main/cryptsetup/dmcrypt.rc

diff --git a/main/cryptsetup/APKBUILD b/main/cryptsetup/APKBUILD
index 798864f..89ec2db 100644
--- a/main/cryptsetup/APKBUILD
+++ b/main/cryptsetup/APKBUILD
@@ -10,6 +10,8 @@ depends=""
 makedepends="lvm2-dev openssl-dev popt-dev util-linux-dev !libiconv-dev"
 subpackages="$pkgname-dev $pkgname-doc $pkgname-libs"
 source="https://www.kernel.org/pub/linux/utils/cryptsetup/v${pkgver%.*}/cryptsetup-$pkgver.tar.gz
+	dmcrypt.confd
+	dmcrypt.rc
 	"
 
 _builddir="$srcdir"/$pkgname-$pkgver
@@ -42,6 +44,10 @@ package() {
 	rm "$pkgdir"/lib/*.la || return 1
 	mkdir -p "$pkgdir"/usr/lib
 	mv "$pkgdir"/lib/pkgconfig "$pkgdir"/usr/lib/
+
+        install -m644 -D "$srcdir"/dmcrypt.confd "$pkgdir"/etc/conf.d/dmcrypt
+        install -m755 -D "$srcdir"/dmcrypt.rc "$pkgdir"/etc/init.d/dmcrypt
+
 }
 
 libs() {
@@ -50,6 +56,12 @@ libs() {
 	mv "$pkgdir"/lib "$subpkgdir"/
 }
 
-md5sums="24790bd4f4fa24570d7ea9af27ccf079  cryptsetup-1.6.6.tar.gz"
-sha256sums="38ccd1ceff41760ccfbaaa5394ebb6117d69bd0ea2e00bf07c0d1353c41be6ac  cryptsetup-1.6.6.tar.gz"
-sha512sums="ce8ea9402f0eb9f3ab920df51837492802dd35394422ef4643a0eb82e6aad67cf72ac428b7caf622539af188f9fe5ba530f06b522f65ed55b0133c5c67ab2723  cryptsetup-1.6.6.tar.gz"
+md5sums="24790bd4f4fa24570d7ea9af27ccf079  cryptsetup-1.6.6.tar.gz
+1369aeaed84e41c8d585695596a24bd6  dmcrypt.confd
+bef4b9289822c47a293f2a0be3526e9c  dmcrypt.rc"
+sha256sums="38ccd1ceff41760ccfbaaa5394ebb6117d69bd0ea2e00bf07c0d1353c41be6ac  cryptsetup-1.6.6.tar.gz
+0c30e081c0b8f879964ae49735f10b05a1d92f4f481042851958860945e13271  dmcrypt.confd
+02faf27470ea0e50b764c923786724847e77dfdf9680a50cc202546cad2bf02f  dmcrypt.rc"
+sha512sums="ce8ea9402f0eb9f3ab920df51837492802dd35394422ef4643a0eb82e6aad67cf72ac428b7caf622539af188f9fe5ba530f06b522f65ed55b0133c5c67ab2723  cryptsetup-1.6.6.tar.gz
+d04ae17d3708ef20ade7afb223d4ef19e1b6812e0be8f9499e37e9c71344568b42030d9dd8f6918a9bfb211a3a94b40a9354e3b32a009cb165e84508d0a5e14b  dmcrypt.confd
+660d1a29294e8e01343aea0b92d9159d42891261d41313c3f9e77ed3bd69e648d19d3799a8ad1b00884b6f4c0f48d4e12cb406ca291e64b789e71ba70ab3c29f  dmcrypt.rc"
diff --git a/main/cryptsetup/dmcrypt.confd b/main/cryptsetup/dmcrypt.confd
new file mode 100644
index 0000000..35a1fd2
--- /dev/null
+++ b/main/cryptsetup/dmcrypt.confd
@@ -0,0 +1,98 @@
+# /etc/conf.d/dmcrypt
+
+# For people who run dmcrypt on top of some other layer (like raid),
+# use rc_need to specify that requirement.  See the runscript(8) man
+# page for more information.
+
+#--------------------
+# Instructions
+#--------------------
+
+# Note regarding the syntax of this file.  This file is *almost* bash,
+# but each line is evaluated separately.  Separate swaps/targets can be
+# specified.  The init-script which reads this file assumes that a
+# swap= or target= line starts a new section, similar to lilo or grub
+# configuration.
+
+# Note when using gpg keys and /usr on a separate partition, you will
+# have to copy /usr/bin/gpg to /bin/gpg so that it will work properly
+# and ensure that gpg has been compiled statically.
+# See http://bugs.gentoo.org/90482 for more information.
+
+# Note that the init-script which reads this file detects whether your
+# partition is LUKS or not. No mkfs is run unless you specify a makefs
+# option.
+
+# Global options:
+#----------------
+
+# Max number of checks to perform (1 per second)
+#dmcrypt_max_timeout=120
+
+# Arguments:
+#-----------
+# target=<name>                      == Mapping name for partition.
+# swap=<name>                        == Mapping name for swap partition.
+# source='<dev>'                     == Real device for partition.
+# key='</path/to/keyfile>[:<mode>]'  == Fullpath from / or from inside removable media.
+# remdev='<dev>'                     == Device that will be assigned to removable media.
+# gpg_options='<opts>'               == Default are --quiet --decrypt
+# options='<opts>'                   == cryptsetup, for LUKS you can only use --readonly
+# loop_file='<file>'                 == Loopback file.
+# pre_mount='cmds'                   == commands to execute before mounting partition.
+# post_mount='cmds'                  == commands to execute after mounting partition.
+#-----------
+# Supported Modes
+# gpg					== decrypt and pipe key into cryptsetup.
+#						Note: new-line character must not be part of key.
+#						Command to erase \n char: 'cat key | tr -d '\n' > cleanKey'
+
+#--------------------
+# dm-crypt examples
+#--------------------
+
+## swap
+# Swap partitions. These should come first so that no keys make their
+# way into unencrypted swap.
+# If no options are given, they will default to: -c aes -h sha1 -d /dev/urandom
+# If no makefs is given then mkswap will be assumed
+#swap=crypt-swap
+#source='/dev/hda2'
+
+## /home with passphrase
+#target=crypt-home
+#source='/dev/hda5'
+
+## /home with regular keyfile
+#target=crypt-home
+#source='/dev/hda5'
+#key='/full/path/to/homekey'
+
+## /home with gpg protected key
+#target=crypt-home
+#source='/dev/hda5'
+#key='/full/path/to/homekey:gpg'
+
+## /home with regular keyfile on removable media(such as usb-stick)
+#target=crypt-home
+#source='/dev/hda5'
+#key='/full/path/to/homekey'
+#remdev='/dev/sda1'
+
+##/home with gpg protected key on removable media(such as usb-stick)
+#target=crypt-home
+#source='/dev/hda5'
+#key='/full/path/to/homekey:gpg'
+#remdev='/dev/sda1'
+
+##/tmp with regular keyfile
+#target=crypt-tmp
+#source='/dev/hda6'
+#key='/full/path/to/tmpkey'
+#pre_mount='/sbin/mkreiserfs -f -f ${dev}'
+#post_mount='chown root:root ${mount_point}; chmod 1777 ${mount_point}'
+
+## Loopback file example
+#mount='crypt-loop-home'
+#source='/dev/loop0'
+#loop_file='/mnt/crypt/home'
diff --git a/main/cryptsetup/dmcrypt.rc b/main/cryptsetup/dmcrypt.rc
new file mode 100644
index 0000000..fed2cc6
--- /dev/null
+++ b/main/cryptsetup/dmcrypt.rc
@@ -0,0 +1,350 @@
+#!/sbin/runscript
+# Copyright 1999-2013 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/sys-fs/cryptsetup/files/1.5.1-dmcrypt.rc,v 1.1 2013/01/17 23:35:08 robbat2 Exp $
+
+depend() {
+	before checkfs fsck
+}
+
+# We support multiple dmcrypt instances based on $SVCNAME
+execute_hook="dm_crypt_execute_dmcrypt"
+# XXX: Should we drop this ?
+# execute_hook="dm_crypt_execute_localmount"
+conf_file="/etc/conf.d/${SVCNAME}"
+
+# Get splash helpers if available.
+if [ -e /sbin/splash-functions.sh ] ; then
+	. /sbin/splash-functions.sh
+fi
+
+# Setup mappings for an individual target/swap
+# Note: This relies on variables localized in the main body below.
+dm_crypt_execute_dmcrypt() {
+	local dev ret mode foo
+
+	if [ -n "${target}" ] ; then
+		# let user set options, otherwise leave empty
+		: ${options:=' '}
+	elif [ -n "${swap}" ] ; then
+		if cryptsetup isLuks ${source} 2>/dev/null ; then
+			ewarn "The swap you have defined is a LUKS partition. Aborting crypt-swap setup."
+			return
+		fi
+		target=${swap}
+		# swap contents do not need to be preserved between boots, luks not required.
+		# suspend2 users should have initramfs's init handling their swap partition either way.
+		: ${options:='-c aes -h sha1 -d /dev/urandom'}
+		: ${pre_mount:='mkswap ${dev}'}
+	else
+		return
+	fi
+	if [ "x${source#UUID}" != "x${source}" ]; then
+		source=${source#UUID=}
+		source="$(blkid -U ${source})"
+	fi
+	if [ -z "${source}" ] && [ ! -e "${source}" ] ; then
+		ewarn "source \"${source}\" for ${target} missing, skipping..."
+		return
+	fi
+
+	if [ -n "${loop_file}" ] ; then
+		dev="/dev/mapper/${target}"
+		ebegin "  Setting up loop device ${source}"
+		losetup ${source} ${loop_file}
+	fi
+
+	# cryptsetup:
+	# luksOpen <device> <name>      # <device> is $source
+	# create   <name>   <device>    # <name>   is $target
+	local arg1="create" arg2="${target}" arg3="${source}" luks=0
+
+	cryptsetup isLuks ${source} 2>/dev/null && { arg1="luksOpen"; arg2="${source}"; arg3="${target}"; luks=1; }
+
+	# Older versions reported:
+	#	${target} is active:
+	# Newer versions report:
+	#	${target} is active[ and is in use.]
+	if cryptsetup status ${target} | egrep -q ' is active' ; then
+		einfo "dm-crypt mapping ${target} is already configured"
+		return
+	fi
+	splash svc_input_begin ${SVCNAME} >/dev/null 2>&1
+
+	# Handle keys
+	if [ -n "${key}" ] ; then
+		read_abort() {
+			# some colors
+			local ans savetty resettty
+			[ -z "${NORMAL}" ] && eval $(eval_ecolors)
+			einfon "  $1? (${WARN}yes${NORMAL}/${GOOD}No${NORMAL}) "
+			shift
+			# This is ugly as s**t.  But POSIX doesn't provide `read -t`, so
+			# we end up having to implement our own crap with stty/etc...
+			savetty=$(stty -g)
+			resettty='stty ${savetty}; trap - EXIT HUP INT TERM'
+			trap 'eval "${resettty}"' EXIT HUP INT TERM
+			stty -icanon
+			[ "${1}" = -t ] && stty min 0 time "$(( $2 * 10 ))"
+			ans=$(dd count=1 bs=1 2>/dev/null) || ans=''
+			eval "${resettty}"
+			if [ -z "${ans}" ] ; then
+				printf '\r'
+			else
+				echo
+			fi
+			case ${ans} in
+				[yY]) return 0;;
+				*) return 1;;
+			esac
+		}
+
+		# Notes: sed not used to avoid case where /usr partition is encrypted.
+		mode=${key/*:/} && ( [ "${mode}" = "${key}" ] || [ -z "${mode}" ] ) && mode=reg
+		key=${key/:*/}
+		case "${mode}" in
+		gpg|reg)
+			# handle key on removable device
+			if [ -n "${remdev}" ] ; then
+				# temp directory to mount removable device
+				local mntrem="${RC_SVCDIR}/dm-crypt-remdev.$$"
+				if [ ! -d "${mntrem}" ] ; then
+					if ! mkdir -p "${mntrem}" ; then
+						ewarn "${source} will not be decrypted ..."
+						einfo "Reason: Unable to create temporary mount point '${mntrem}'"
+						return
+					fi
+				fi
+				i=0
+				einfo "Please insert removable device for ${target}"
+				while [ ${i} -lt ${dmcrypt_max_timeout:-120} ] ; do
+					foo=""
+					if mount -n -o ro "${remdev}" "${mntrem}" 2>/dev/null >/dev/null ; then
+						# keyfile exists?
+						if [ ! -e "${mntrem}${key}" ] ; then
+							umount -n "${mntrem}"
+							rmdir "${mntrem}"
+							einfo "Cannot find ${key} on removable media."
+							read_abort "Abort" ${read_timeout:--t 1} && return
+						else
+							key="${mntrem}${key}"
+							break
+						fi
+					else
+						[ -e "${remdev}" ] \
+							&& foo="mount failed" \
+							|| foo="mount source not found"
+					fi
+					: $((i += 1))
+					read_abort "Stop waiting after $i attempts (${foo})" -t 1 && return
+				done
+			else    # keyfile ! on removable device
+				if [ ! -e "${key}" ] ; then
+					ewarn "${source} will not be decrypted ..."
+					einfo "Reason: keyfile ${key} does not exist."
+					return
+				fi
+			fi
+			;;
+		*)
+			ewarn "${source} will not be decrypted ..."
+			einfo "Reason: mode ${mode} is invalid."
+			return
+			;;
+		esac
+	else
+		mode=none
+	fi
+	ebegin "  ${target} using: ${options} ${arg1} ${arg2} ${arg3}"
+	if [ "${mode}" = "gpg" ] ; then
+		: ${gpg_options:='-q -d'}
+		# gpg available ?
+		if type -p gpg >/dev/null ; then
+			for i in 0 1 2 ; do
+				# paranoid, don't store key in a variable, pipe it so it stays very little in ram unprotected.
+				# save stdin stdout stderr "values"
+				gpg ${gpg_options} ${key} 2>/dev/null | cryptsetup ${options} ${arg1} ${arg2} ${arg3}
+				ret=$?
+				[ ${ret} -eq 0 ] && break
+			done
+			eend ${ret} "failure running cryptsetup"
+		else
+			ewarn "${source} will not be decrypted ..."
+			einfo "Reason: cannot find gpg application."
+			einfo "You have to install app-crypt/gnupg first."
+			einfo "If you have /usr on its own partition, try copying gpg to /bin ."
+		fi
+	else
+		if [ "${mode}" = "reg" ] ; then
+			cryptsetup ${options} -d ${key} ${arg1} ${arg2} ${arg3}
+			ret=$?
+			eend ${ret} "failure running cryptsetup"
+		else
+			cryptsetup ${options} ${arg1} ${arg2} ${arg3}
+			ret=$?
+			eend ${ret} "failure running cryptsetup"
+		fi
+	fi
+	if [ -d "${mntrem}" ] ; then
+		umount -n ${mntrem} 2>/dev/null >/dev/null
+		rmdir ${mntrem} 2>/dev/null >/dev/null
+	fi
+	splash svc_input_end ${SVCNAME} >/dev/null 2>&1
+
+	if [ ${ret} -ne 0 ] ; then
+		cryptfs_status=1
+	else
+		if [ -n "${pre_mount}" ] ; then
+			dev="/dev/mapper/${target}"
+			ebegin "    pre_mount: ${pre_mount}"
+			eval "${pre_mount}" > /dev/null
+			ewend $? || cryptfs_status=1
+		fi
+	fi
+}
+
+# Run any post_mount commands for an individual mount
+#
+# Note: This relies on variables localized in the main body below.
+dm_crypt_execute_localmount() {
+	local mount_point
+
+	[ -z "${target}" ] && [ -z "${post_mount}" ] && return
+
+	if ! cryptsetup status ${target} | egrep -q '\<active:' ; then
+		ewarn "Skipping unmapped target ${target}"
+		cryptfs_status=1
+		return
+	fi
+
+	mount_point=$(grep "/dev/mapper/${target}" /proc/mounts | cut -d' ' -f2)
+	if [ -z "${mount_point}" ] ; then
+		ewarn "Failed to find mount point for ${target}, skipping"
+		cryptfs_status=1
+	fi
+
+	if [ -n "${post_mount}" ] ; then
+		ebegin "Running post_mount commands for target ${target}"
+		eval "${post_mount}" >/dev/null
+		eend $? || cryptfs_status=1
+	fi
+}
+
+# Lookup optional bootparams
+get_bootparam_val() {
+	# We're given something like:
+	#    foo=bar=cow
+	# Return the "bar=cow" part.
+	case $1 in
+	*\=*)
+		local key=$(echo "$1" | cut -f1 -d=)
+		echo "$1" | cut -c $(( ${#key} + 2 ))
+		;;
+	esac
+}
+
+start() {
+	local header=true cryptfs_status=0
+	local gpg_options key loop_file target targetline options pre_mount post_mount source swap remdev
+
+	local x
+	for x in $(cat /proc/cmdline) ; do
+		case "${x}" in
+		key_timeout\=*)
+			local KEY_TIMEOUT=$(get_bootparam_val "${x}")
+			if [ ${KEY_TIMEOUT} -gt 0 ] ; then
+				read_timeout="-t ${KEY_TIMEOUT}"
+			fi
+		;;
+		esac
+	done
+
+	while read -u 3 targetline ; do
+		case ${targetline} in
+		# skip comments and blank lines
+		""|"#"*) continue ;;
+		# skip service-specific openrc configs #377927
+		rc_*) continue ;;
+		esac
+
+		${header} && ebegin "Setting up dm-crypt mappings"
+		header=false
+
+		# check for the start of a new target/swap
+		case ${targetline} in
+		target=*|swap=*)
+			# If we have a target queued up, then execute it
+			${execute_hook}
+
+			# Prepare for the next target/swap by resetting variables
+			unset gpg_options key loop_file target options pre_mount post_mount source swap remdev
+			;;
+
+		gpg_options=*|remdev=*|key=*|loop_file=*|options=*|pre_mount=*|post_mount=*|source=*)
+			if [ -z "${target}${swap}" ] ; then
+				ewarn "Ignoring setting outside target/swap section: ${targetline}"
+				continue
+			fi
+			;;
+
+		dmcrypt_max_timeout=*)
+			# ignore global options
+			continue
+			;;
+
+		*)
+			ewarn "Skipping invalid line in ${conf_file}: ${targetline}"
+			;;
+		esac
+
+		# Queue this setting for the next call to dm_crypt_execute_xxx
+		eval "${targetline}"
+	done 3< ${conf_file}
+
+	# If we have a target queued up, then execute it
+	${execute_hook}
+
+	ewend ${cryptfs_status} "Failed to setup dm-crypt devices"
+}
+
+stop() {
+	local line header
+
+	# Break down all mappings
+	header=true
+	egrep "^(target|swap)=" ${conf_file} | \
+	while read line ; do
+		${header} && einfo "Removing dm-crypt mappings"
+		header=false
+
+		target= swap=
+		eval ${line}
+
+		[ -n "${swap}" ] && target=${swap}
+		if [ -z "${target}" ] ; then
+			ewarn "invalid line in ${conf_file}: ${line}"
+			continue
+		fi
+
+		ebegin "  ${target}"
+		cryptsetup remove ${target}
+		eend $?
+	done
+
+	# Break down loop devices
+	header=true
+	grep '^source=./dev/loop' ${conf_file} | \
+	while read line ; do
+		${header} && einfo "Detaching dm-crypt loop devices"
+		header=false
+
+		source=
+		eval ${line}
+
+		ebegin "  ${source}"
+		losetup -d "${source}"
+		eend $?
+	done
+
+	return 0
+}
-- 
2.0.0

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