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Current File : /proc/self/root/usr/share/initramfs-tools/hooks/cryptroot
#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/hook-functions

get_root_device() {
	local device mount type options dump pass

	if [ ! -r /etc/fstab ]; then
		return 1
	fi

	grep -s '^[^#]' /etc/fstab | \
	while read device mount type options dump pass; do
		if [ "$mount" = "/" ]; then
			device=$(canonical_device "$device") || return 0
			echo "$device"
			return
		fi
	done
}

get_resume_devices() {
	local device opt count dupe candidates devices
	candidates=""

	# First, get a list of potential resume devices

	# uswsusp
	if [ -e /etc/uswsusp.conf ]; then
		device=$(sed -rn 's/^resume device[[:space:]]*[:=][[:space:]]*// p' /etc/uswsusp.conf)
		if [ -n "$device" ]; then
			candidates="$candidates $device"
		fi
	fi

	# uswsusp - again...
	if [ -e /etc/suspend.conf ]; then
		device=$(sed -rn 's/^resume device[[:space:]]*[:=][[:space:]]*// p' /etc/suspend.conf)
		if [ -n "$device" ]; then
			candidates="$candidates $device"
		fi
	fi

	# regular swsusp
	for opt in $(cat /proc/cmdline); do
		case $opt in
		resume=*)
			device="${opt#resume=}"
			candidates="$candidates $device"
			;;
		esac
	done

	# initramfs-tools
	if [ -e /etc/initramfs-tools/conf.d/resume ]; then
		device=$(sed -rn 's/^RESUME[[:space:]]*=[[:space:]]*// p' /etc/initramfs-tools/conf.d/resume)
		if [ -n "$device" ]; then
			candidates="$candidates $device"
		fi
	fi

	# Now check the sanity of all candidates
	devices=""
	count=0
	for device in $candidates; do
		# Remove quotes around device candidate
		device=$(echo $device | sed -e 's/^"\(.*\)"[[:space:]]*$/\1/' -e "s/^'\(.*\)'[[:space:]]*$/\1/")

		# Weed out clever defaults
		if [ "$device" = "<path_to_resume_device_file>" ]; then
			continue
		fi

		# Detect devices required by decrypt_derived
		derived="$(grep "^${device#/dev/mapper/}\b.*decrypt_derived" /etc/crypttab 2>/dev/null | awk '{print $3}')"
		if [ -n "$derived" ]; then
			if grep -q "^$derived" /etc/crypttab; then
				derived=$(canonical_device "/dev/mapper/$derived") || return 0
				if [ "$derived" != "$rootdev" ]; then
					devices="$devices $derived"
				fi
			else
				echo "cryptsetup: WARNING: decrypt_derived device $derived not found in crypttab" >&2
			fi
		fi

		device=$(canonical_device "$device") || return 0

		# Weed out duplicates
		dupe=0
		for opt in $devices; do
			if [ "$device" = "$opt" ]; then
				dupe=1
			fi
		done
		if [ $dupe -eq 1 ]; then
			continue
		fi

		# This device seems ok
		devices="$devices $device"
		count=$(( $count + 1 ))
	done

	if [ $count -gt 1 ]; then
		echo "cryptsetup: WARNING: found more than one resume device candidate:" >&2
		for device in $devices; do
			echo "                     $device" >&2
		done
	fi

	if [ $count -gt 0 ]; then
		echo $devices
	fi

	return 0
}

node_is_in_crypttab() {
	local node
	node="$1"

	grep -q "^$node\b" /etc/crypttab
	return $?
}

get_lvm_deps() {
	local node deps maj min depnode
	node="$1"

	if [ -z $node ]; then
		echo "cryptsetup: WARNING: get_lvm_deps - invalid arguments" >&2
		return 1
	fi

	if ! deps=$(vgs --noheadings -o pv_name $(dmsetup --noheadings splitname $node | cut -d':' -f1) 2>/dev/null); then
		# $node is not a LVM node, stopping here
		return 0
	fi

	# We should now have a list physical volumes for the VG
	for dep in $deps; do
		depnode=$(dmsetup info -c --noheadings -o name "$dep" 2>/dev/null)
		if [ -z "$depnode" ]; then
			continue
		fi
		if [ "$(dmsetup table "$depnode" 2>/dev/null | cut -d' ' -f3)" != "crypt" ]; then
			get_lvm_deps "$depnode"
			continue
		fi
		echo "$depnode"
	done

	return 0
}

get_device_opts() {
	local target source link extraopts rootopts opt
	target="$1"
	extraopts="$2"
	KEYSCRIPT=""
	OPTIONS=""

	if [ -z "$target" ]; then
		echo "cryptsetup: WARNING: get_device_opts - invalid arguments" >&2
		return 1
	fi

	opt=$( grep "^$target\b" /etc/crypttab | head -1 | sed 's/[[:space:]]\+/ /g' )
	source=$( echo $opt | cut -d " " -f2 )
	key=$( echo $opt | cut -d " " -f3 )
	rootopts=$( echo $opt | cut -d " " -f4- )

	if [ -z "$opt" ] || [ -z "$source" ] || [ -z "$key" ] || [ -z "$rootopts" ]; then
		echo "cryptsetup: WARNING: invalid line in /etc/crypttab for $target - $opt" >&2
		return 1
	fi

	# Sanity checks for $source
	if [ -h "$source" ]; then
		link=$(readlink -nqe "$source")
		if [ -z "$link" ]; then
			echo "cryptsetup: WARNING: $source is a dangling symlink" >&2
			return 1
		fi

		if [ "$link" != "${link#/dev/mapper/}" ]; then
			echo "cryptsetup: NOTE: using $link instead of $source for $target" >&2
			source="$link"
		fi
	fi

	# Sanity checks for $key
	if [ "$key" = "/dev/random" ] || [ "$key" = "/dev/urandom" ]; then
		echo "cryptsetup: WARNING: target $target has a random key, skipped" >&2
		return 1
	fi

	if [ -n "$extraopts" ]; then
		rootopts="$extraopts,$rootopts"
	fi

	# We have all the basic options, let's go trough them
	OPTIONS="target=$target,source=$source,key=$key"
	local IFS=", "
	unset HASH_FOUND
	unset LUKS_FOUND
	for opt in $rootopts; do
		case $opt in
			cipher=*)
				OPTIONS="$OPTIONS,$opt"
				;;
			hash=*)
				OPTIONS="$OPTIONS,$opt"
				HASH_FOUND=1
				;;
			size=*)
				OPTIONS="$OPTIONS,$opt"
				;;
			lvm=*)
				OPTIONS="$OPTIONS,$opt"
				;;
			keyscript=*)
				opt=${opt#keyscript=}
				if [ ! -x "/lib/cryptsetup/scripts/$opt" ] && [ ! -x "$opt" ]; then
					echo "cryptsetup: WARNING: target $target has an invalid keyscript, skipped" >&2
					return 1
				fi
				KEYSCRIPT="$opt"
				OPTIONS="$OPTIONS,keyscript=/lib/cryptsetup/scripts/$(basename "$opt")"
				;;
			tries=*)
				OPTIONS="$OPTIONS,$opt"
				;;
			rootdev)
				OPTIONS="$OPTIONS,$opt"
				;;
			discard)
				OPTIONS="$OPTIONS,$opt"
				;;
			luks)
				LUKS_FOUND=1
				;;
			*)
				# Presumably a non-supported option
				;;
		esac
	done

	# Warn for missing hash option, unless we have a LUKS partition
	if [ -z "$HASH_FOUND" ] && [ -z "$LUKS_FOUND" ]; then
		echo "WARNING: Option hash missing in crypttab for target $target, assuming ripemd160." >&2
		echo "         If this is wrong, this initramfs image will not boot." >&2
		echo "         Please read /usr/share/doc/cryptsetup/README.initramfs.gz and add" >&2
		echo "         the correct hash option to your /etc/crypttab."  >&2
	fi

	# If keyscript is set, the "key" is just an argument to the script
	if [ "$key" != "none" ] && [ -z "$KEYSCRIPT" ]; then
		echo "cryptsetup: WARNING: target $target uses a key file, skipped" >&2
		return 1
	fi
}

get_device_modules() {
	local node value cipher blockcipher ivhash
	node="$1"

	# Check the ciphers used by the active root mapping
	value=$(dmsetup table "$node" | cut -d " " -f4)
	cipher=$(echo "$value" | cut -d ":" -f1 | cut -d "-" -f1)
	blockcipher=$(echo "$value" | cut -d ":" -f1 | cut -d "-" -f2)
	ivhash=$(echo "$value" | cut -d ":" -s -f2)

	if [ -n "$cipher" ]; then
		echo "$cipher"
	else
		return 1
	fi

	if [ -n "$blockcipher" ] && [ "$blockcipher" != "plain" ]; then
		echo "$blockcipher"
	fi

	if [ -n "$ivhash" ] && [ "$ivhash" != "plain" ]; then
		echo "$ivhash"
	fi
	return 0
}

canonical_device() {
	local dev altdev original
	dev="$1"

	altdev="${dev#LABEL=}"
	if [ "$altdev" != "$dev" ]; then
		dev="/dev/disk/by-label/$altdev"
	fi

	altdev="${dev#UUID=}"
	if [ "$altdev" != "$dev" ]; then
		dev="/dev/disk/by-uuid/$altdev"
	fi

	original="$dev"
	if [ -h "$dev" ]; then
		dev=$(readlink -e "$dev")
	fi

	if [ "x${dev%/dev/dm-*}" = "x" ]; then
		# try to detect corresponding symlink in /dev/mapper/
		for dmdev in /dev/mapper/*; do
			if [ "$(readlink -e "$dmdev")" = "$dev" ]; then
				dev="$dmdev"
			fi
		done
	fi

	altdev="${dev#/dev/mapper/}"
	if [ "$altdev" != "$dev" ]; then
		echo "$altdev"
		return 0
	elif [ "x${original%/dev/disk/by-*/*}" = "x" ]; then
		# support crypttab UUID/LABEL entries
		# this is a /dev/disk/by-*/ path so return just the 'basename'
		echo "${original##/dev/disk/by-*/}"
		return 0
	fi

	echo "cryptsetup: WARNING: failed to detect canonical device of $original" >&2
	return 1
}

add_device() {
	local node nodes opts lastopts i count
	nodes="$1"
	opts=""     # Applied to all nodes
	lastopts="" # Applied to last node

	if [ -z "$nodes" ]; then
		return 0
	fi

	# Flag root device
	if [ "$nodes" = "$rootdev" ]; then
		if [ -z "$opts" ]; then
			opts="rootdev"
		else
			opts="$opts,rootdev"
		fi
	fi

	# Check that it is a node under /dev/mapper/
	# nodes=$(canonical_device "$nodes") || return 0

	# Can we find this node in crypttab
	if ! node_is_in_crypttab "$nodes"; then
		# dm node but not in crypttab, is it a lvm device backed by dm-crypt nodes?
		lvmnodes=$(get_lvm_deps "$nodes") || return 1

		# not backed by any dm-crypt nodes; stop here
		if [ -z "$lvmnodes" ]; then
		    return 0
		fi

		# It is a lvm device!
		lastopts="lvm=$nodes"
		nodes="$lvmnodes"
	fi

	# Prepare to setup each node
	count=$(echo "$nodes" | wc -w)
	i=1
	for node in $nodes; do
		# Prepare the additional options
		if [ $i -eq $count ]; then
			if [ -z "$opts" ]; then
				opts="$lastopts"
			elif [ -n "$lastopts" ]; then
				opts="$opts,$lastopts"
			fi
		fi

		# Get crypttab root options
		if ! get_device_opts "$node" "$opts"; then
			continue
		fi
		echo "$OPTIONS" >>"$DESTDIR/conf/conf.d/cryptroot"

		# If we have a keyscript, make sure it is included
		if [ -n "$KEYSCRIPT" ]; then
			if [ ! -d "$DESTDIR/lib/cryptsetup/scripts" ]; then
				mkdir -p "$DESTDIR/lib/cryptsetup/scripts"
			fi

			if [ -e "/lib/cryptsetup/scripts/$KEYSCRIPT" ]; then
				copy_exec "/lib/cryptsetup/scripts/$KEYSCRIPT" /lib/cryptsetup/scripts >&2
			elif [ -e "$KEYSCRIPT" ]; then
				copy_exec "$KEYSCRIPT" /lib/cryptsetup/scripts >&2
			elif KSTYPE="$(type "$KEYSCRIPT" 2>&1)"; then
				if [ -x "${KSTYPE#"$KEYSCRIPT" is }" ]; then
					copy_exec "${KSTYPE#"$KEYSCRIPT" is }" /lib/cryptsetup/scripts >&2
				fi
			else
				echo "cryptsetup: WARNING: failed to find keyscript $KEYSCRIPT" >&2
				continue
			fi
		fi

		# Calculate needed modules
		modules=$(get_device_modules $node | sort | uniq)
		if [ -z "$modules" ]; then
			echo "cryptsetup: WARNING: failed to determine cipher modules to load for $node" >&2
			continue
		fi
		echo dm_mod
		echo dm_crypt
		echo "$modules"
		# Load hardware aes module
		if cpu_has_aesni; then
			echo aesni
		fi
		i=$(( $i + 1 ))
	done

	return 0
}

cpu_has_aesni() {
	return $(grep -q "^flags\s*:\s*.*aes" /proc/cpuinfo)
}

add_crypto_modules() {
	local mod file altmod found genericfound
	mod="$1"
	found=""
	genericfound=""

	if [ -z "$mod" ]; then
		return 1
	fi

	# We have several potential sources of modules (in order of preference):
	#
	#   a) /lib/modules/$VERSION/kernel/arch/$ARCH/crypto/$mod-$specific.ko
	#   b) /lib/modules/$VERSION/kernel/crypto/$mod_generic.ko
	#   c) /lib/modules/$VERSION/kernel/crypto/$mod.ko
	#
	# and (currently ignored):
	#
	#   d) /lib/modules/$VERSION/kernel/drivers/crypto/$specific-$mod.ko

	for file in $(find "$MODULESDIR/kernel/arch/" -name "$mod-*.ko" 2>/dev/null); do
		altmod="${file##*/}"
		altmod="${altmod%.ko}"
		manual_add_modules "$altmod"
		found="yes"
	done

	for file in $(find "$MODULESDIR/kernel/crypto/" -name "${mod}_generic.ko" 2>/dev/null); do
		altmod="${file##*/}"
		altmod="${altmod%.ko}"
		manual_add_modules "$altmod"
		found="yes"
		genericfound="yes"
	done

	if [ -z "$genericfound" ]; then
		for file in $(find "$MODULESDIR/kernel/crypto/" -name "${mod}.ko" 2>/dev/null); do
			altmod="${file##*/}"
			altmod="${altmod%.ko}"
			manual_add_modules "$altmod"
			found="yes"
		done
	fi

	if [ -z "$found" ]; then
		return 1
	fi

	return 0
}

#
# Begin real processing
#

setup="no"
rootdev=""
resumedevs=""

# Include cryptsetup modules, regardless of _this_ machine
# configuration
if [ -n "$CRYPTSETUP" ] && [ "$CRYPTSETUP" != "n" ]; then
    setup="yes"
fi

# Find the root and resume device(s)
if [ -r /etc/crypttab ]; then
	rootdev=$(get_root_device)
	if [ -z "$rootdev" ]; then
		echo "cryptsetup: WARNING: could not determine root device from /etc/fstab" >&2
	fi
	resumedevs=$(get_resume_devices)
fi

# Load the config opts and modules for each device
for dev in $rootdev $resumedevs; do
	if ! modules=$(add_device "$dev"); then
		echo "cryptsetup: FAILURE: could not determine configuration for $dev" >&2
		continue
	fi

	if [ -n "$modules" ]; then
	    setup="yes"
	fi

	if [ "$setup" = "no" ]; then
	    continue
	fi

	if [ "$MODULES" = "most" ]; then
		archcrypto="$(find "$MODULESDIR/kernel/arch" -type d -name "crypto" 2>/dev/null)"
		if [ -n "$archcrypto" ]; then
			copy_modules_dir "${archcrypto##*${MODULESDIR}/}"
		fi
		copy_modules_dir "kernel/crypto"
	else
		for mod in $modules; do
			add_crypto_modules $mod
		done
	fi
done

# With large initramfs, we always add a basic subset of modules
if [ "$MODULES" != "dep" ] && [ "$setup" = "yes" ]; then
	for mod in aes cbc chainiv cryptomgr krng sha256 xts; do
		add_crypto_modules $mod
	done
fi

# See if we need to add the basic components
if [ "$setup" = "yes" ]; then
	for mod in dm_mod dm_crypt; do
		manual_add_modules $mod
	done

	copy_exec /sbin/cryptsetup
	copy_exec /sbin/dmsetup
	copy_exec /lib/cryptsetup/askpass

	# We need sed. Either via busybox or as standalone binary.
	if [ "$BUSYBOX" = "n" ] || [ ! -e ${BUSYBOXDIR}/busybox ]; then
		copy_exec /bin/sed
	fi
fi

exit 0

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