#!/bin/bash

PS4='$LINENO:'
[ -z "$CRYPTSETUP_PATH" ] && CRYPTSETUP_PATH=".."
CRYPTSETUP=$CRYPTSETUP_PATH/cryptsetup
CRYPTSETUP_RAW=$CRYPTSETUP

CRYPTSETUP_VALGRIND=../.libs/cryptsetup
CRYPTSETUP_LIB_VALGRIND=../.libs
IMG=reenc-mangle-data
IMG_HDR=$IMG.hdr
IMG_HDR_BCP=$IMG_HDR.bcp
IMG_JSON=$IMG.json
KEY1=key1
DEV_NAME=reenc3492834

FAST_PBKDF2="--pbkdf pbkdf2 --pbkdf-force-iterations 1000"
CS_PWPARAMS="--disable-keyring --key-file $KEY1"
CS_PARAMS="-q --disable-locks $CS_PWPARAMS"
JSON_MSIZE=16384

function remove_mapping()
{
	[ -b /dev/mapper/$DEV_NAME ] && dmsetup remove --retry $DEV_NAME
	rm -f $IMG $IMG_HDR $IMG_HDR_BCP $IMG_JSON $KEY1 >/dev/null 2>&1
}

function fail()
{
	local frame=0
	[ -n "$1" ] && echo "$1"
	echo "FAILED backtrace:"
	while caller $frame; do	((frame++)); done
	remove_mapping
	exit 2
}

function skip()
{
	[ -n "$1" ] && echo "$1"
	remove_mapping
	exit 77
}

function bin_check()
{
	command -v $1 >/dev/null || skip "WARNING: test require $1 binary, test skipped."
}

function img_json_save()
{
	local _hdr=$IMG
	[ -z "$1" ] || _hdr="$1"
	# FIXME: why --json-file cannot be used?
	$CRYPTSETUP luksDump --dump-json-metadata $_hdr | jq -c -M . | tr -d '\n' >$IMG_JSON
}

function img_json_dump()
{
	img_json_save
	jq . $IMG_JSON
}

function img_hash_save()
{
	IMG_HASH=$(sha256sum $IMG | cut -d' ' -f 1)
}

function img_hash_unchanged()
{
	local IMG_HASH2=$(sha256sum $IMG | cut -d' ' -f 1)
	[ "$IMG_HASH" != "$IMG_HASH2" ] && fail "Image changed!"
}

function img_prepare_raw() # $1 options
{
	remove_mapping

	if [ ! -e $KEY1 ]; then
		dd if=/dev/urandom of=$KEY1 count=1 bs=32 >/dev/null 2>&1
	fi

	truncate -s 32M $IMG || fail
	$CRYPTSETUP luksFormat $FAST_PBKDF2 $CS_PARAMS --luks2-metadata-size $JSON_MSIZE $IMG $1 || fail
}

function img_prepare() # $1 options
{
	img_prepare_raw
	$CRYPTSETUP reencrypt $IMG $CS_PARAMS -q --init-only --resilience none $1 >/dev/null 2>&1
	[ $? -ne 0 ] && skip "Reencryption unsupported, test skipped."
	img_json_save
	img_hash_save
}

function _dd()
{
	dd $@ status=none conv=notrunc bs=1
}

# header mangle functions
function img_update_json()
{
	local _hdr="$IMG"
	local LUKS2_BIN1_OFFSET=448
	local LUKS2_BIN2_OFFSET=$((LUKS2_BIN1_OFFSET + $JSON_MSIZE))
	local LUKS2_JSON_SIZE=$(($JSON_MSIZE - 4096))

	# if present jq script, mangle JSON
	if [ -n "$1" ]; then
		local JSON=$(cat $IMG_JSON)
		echo $JSON | jq -M -c "$1" >$IMG_JSON || fail
		local JSON=$(cat $IMG_JSON)
		echo $JSON | tr -d '\n' >$IMG_JSON || fail
	fi

	[ -z "$2" ] || _hdr="$2"

	# wipe JSON areas
	_dd if=/dev/zero of=$_hdr count=$LUKS2_JSON_SIZE seek=4096
	_dd if=/dev/zero of=$_hdr count=$LUKS2_JSON_SIZE seek=$(($JSON_MSIZE + 4096))

	# write JSON data
	_dd if=$IMG_JSON of=$_hdr count=$LUKS2_JSON_SIZE seek=4096
	_dd if=$IMG_JSON of=$_hdr count=$LUKS2_JSON_SIZE seek=$(($JSON_MSIZE + 4096))

	# erase sha256 checksums
	_dd if=/dev/zero of=$_hdr count=64 seek=$LUKS2_BIN1_OFFSET
	_dd if=/dev/zero of=$_hdr count=64 seek=$LUKS2_BIN2_OFFSET

	# calculate sha256 and write chexksums
	local SUM1_HEX=$(_dd if=$_hdr count=$JSON_MSIZE | sha256sum | cut -d ' ' -f 1)
	echo $SUM1_HEX | xxd -r -p | _dd of=$_hdr seek=$LUKS2_BIN1_OFFSET count=64 || fail

	local SUM2_HEX=$(_dd if=$_hdr skip=$JSON_MSIZE count=$JSON_MSIZE | sha256sum | cut -d ' ' -f 1)
	echo $SUM2_HEX | xxd -r -p | _dd of=$_hdr seek=$LUKS2_BIN2_OFFSET count=64 || fail

	img_hash_save
}

function img_check_ok()
{
	if [ $(id -u) == 0 ]; then
		$CRYPTSETUP open $CS_PWPARAMS $IMG $DEV_NAME || fail
		$CRYPTSETUP close $DEV_NAME || fail
	fi

	$CRYPTSETUP repair $IMG $CS_PARAMS || fail
}

function img_check_dump_ok()
{
	$CRYPTSETUP luksDump $IMG >/dev/null || fail
	img_check_fail
}

function img_check_fail()
{
	if [ $(id -u) == 0 ]; then
		$CRYPTSETUP open $CS_PWPARAMS $IMG $DEV_NAME 2>/dev/null && fail
	fi

	$CRYPTSETUP repair $IMG $CS_PARAMS 2>/dev/null && fail
	img_hash_unchanged
}

function img_run_reenc_ok()
{
	$CRYPTSETUP_RAW reencrypt $IMG $CS_PWPARAMS -q --disable-locks --force-offline-reencrypt --resilience none || fail
}

function img_run_reenc_ok_data_shift()
{
	$CRYPTSETUP_RAW reencrypt $IMG $CS_PWPARAMS -q --disable-locks --force-offline-reencrypt || fail
}

function img_run_reenc_fail()
{
$CRYPTSETUP_RAW reencrypt $IMG $CS_PWPARAMS --force-offline-reencrypt --disable-locks -q 2>/dev/null && fail "Reencryption passed (should have failed)."
img_hash_unchanged
}

function img_check_fail_repair()
{
	if [ $(id -u) == 0 ]; then
		$CRYPTSETUP open $CS_PWPARAMS $IMG $DEV_NAME 2>/dev/null && fail
	fi

	img_run_reenc_fail

	# repair metadata
	$CRYPTSETUP repair $IMG $CS_PARAMS || fail

	img_check_ok
}

function img_check_fail_repair_ok()
{
	img_check_fail_repair
	img_run_reenc_ok
}

function img_check_fail_repair_ok_data_shift()
{
	img_check_fail_repair
	img_run_reenc_ok_data_shift
}

function valgrind_setup()
{
	bin_check valgrind
	[ ! -f $CRYPTSETUP_VALGRIND ] && fail "Unable to get location of cryptsetup executable."
	export LD_LIBRARY_PATH="$CRYPTSETUP_LIB_VALGRIND:$LD_LIBRARY_PATH"
	CRYPTSETUP=valgrind_run
	CRYPTSETUP_RAW="./valg.sh ${CRYPTSETUP_VALGRIND}"
}

function valgrind_run()
{
	export INFOSTRING="$(basename ${BASH_SOURCE[1]})-line-${BASH_LINENO[0]}"
	$CRYPTSETUP_RAW "$@"
}

[ ! -x "$CRYPTSETUP" ] && skip "Cannot find $CRYPTSETUP, test skipped."

bin_check jq
bin_check sha256sum
bin_check xxd

export LANG=C

[ -n "$VALG" ] && valgrind_setup && CRYPTSETUP=valgrind_run

echo "[1] Reencryption with old flag is rejected"
img_prepare
img_update_json '.config.requirements.mandatory = ["online-reencryptx"]'
img_check_fail
img_update_json '.config.requirements.mandatory = ["online-reencrypt-v2"]'
img_check_ok
img_run_reenc_ok
img_check_ok

# Simulate old reencryption with no digest (repairable)
img_prepare
img_update_json 'del(.digests."2") | .config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok

# Simulate future version of reencrypt flag (should pass luksDump)
img_prepare
img_update_json '.config.requirements.mandatory = ["online-reencrypt-v999"]'
img_check_dump_ok

# Multiple reencrypt requirement flags makes LUKS2 invalid
img_prepare
img_update_json '.config.requirements.mandatory = .config.requirements.mandatory + ["online-reencrypt-v999"]'
img_check_fail

img_prepare
img_update_json '.config.requirements.mandatory = .config.requirements.mandatory + ["online-reencrypt"]'
img_check_fail

# just regular unknown requirement
img_prepare
img_update_json '.config.requirements.mandatory = .config.requirements.mandatory + ["online-reencrypt-v3X"]'
img_check_dump_ok

# This must fail for new releases
echo "[2] Old reencryption in-progress (journal)"
img_prepare
img_update_json '
	del(.digests."2") |
	.keyslots."2".area.type = "journal" |
	.segments = {
		"0" : (.segments."0" +
			{"size" : .keyslots."2".area.size} +
			{"flags" : ["in-reencryption"]}),
		"1" : (.segments."0" +
			{"offset" : ((.segments."0".offset|tonumber) +
			(.keyslots."2".area.size|tonumber))|tostring}),
		"2" : .segments."1",
		"3" : .segments."2"
	} |
	.digests."0".segments = ["1","2"] |
	.digests."1".segments = ["0","3"] |
	.config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok

echo "[3] Old reencryption in-progress (checksum)"
img_prepare
img_update_json '
	del(.digests."2") |
	.keyslots."2".area.type = "checksum" |
	.keyslots."2".area.hash = "sha256" |
	.keyslots."2".area.sector_size = 4096 |
	.segments = {
		"0" : (.segments."0" +
			{"size" : .keyslots."2".area.size} +
			{"flags" : ["in-reencryption"]}),
		"1" : (.segments."0" +
			{"offset": ((.segments."0".offset|tonumber) +
			(.keyslots."2".area.size|tonumber))|tostring}),
		"2" : .segments."1",
		"3" : .segments."2"
	} |
	.digests."0".segments = ["1","2"] |
	.digests."1".segments = ["0","3"] |
	.config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok

# Note: older tools cannot create this from commandline
echo "[4] Old decryption in-progress (journal)"
img_prepare
img_update_json '
	del(.digests."1") |
	del(.digests."2") |
	del(.keyslots."1") |
	.keyslots."2".mode = "decrypt" |
	.keyslots."2".area.type = "journal" |
	.segments = {
		"0" : {
			"type" : "linear",
			"offset" : .segments."0".offset,
			"size" : .keyslots."2".area.size,
			"flags" : ["in-reencryption"]
		},
		"1" : (.segments."0" +
			{"offset" : ((.segments."0".offset|tonumber) +
			(.keyslots."2".area.size|tonumber))|tostring}),
		"2" : .segments."1",
		"3" : {
			"type" : "linear",
			"offset" : .segments."0".offset,
			"size" : "dynamic",
			"flags" : ["backup-final"]
		}
	} |
	.digests."0".segments = ["1","2"] |
	.config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok

echo "[5] Old decryption in-progress (checksum)"
img_prepare
img_update_json '
	del(.digests."1") |
	del(.digests."2") |
	del(.keyslots."1") |
	.keyslots."2".mode = "decrypt" |
	.keyslots."2".area.type = "checksum" |
	.keyslots."2".area.hash = "sha256" |
	.keyslots."2".area.sector_size = 4096 |
	.segments = {
		"0" : {
			"type" : "linear",
			"offset" : .segments."0".offset,
			"size" : .keyslots."2".area.size,
			"flags" : ["in-reencryption"]
		},
		"1" : (.segments."0" +
			{"offset" : ((.segments."0".offset|tonumber) +
			(.keyslots."2".area.size|tonumber))|tostring}),
		"2" : .segments."1",
		"3" : {
			"type" : "linear",
			"offset" : .segments."0".offset,
			"size" : "dynamic",
			"flags" : ["backup-final"]
		}
	} |
	.digests."0".segments = ["1","2"] |
	.config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok

# Note - offset is set to work with the old version (with a datashift bug)
echo "[6] Old reencryption in-progress (datashift)"
img_prepare
img_update_json '
	del(.digests."2") |
	.keyslots."2".direction = "backward" |
	.keyslots."2".area.type = "datashift" |
	.keyslots."2".area.size = "4096" |
	.keyslots."2".area.shift_size = ((1 * 1024 * 1024)|tostring) |
	.segments = {
		"0" : (.segments."0" +
			{"size" : ((13 * 1024 * 1024)|tostring)}),
		"1" : (.segments."0" +
			{"offset" : ((30 * 1024 * 1024)|tostring)}),
		"2" : .segments."1",
		"3" : (.segments."2" +
			{"offset" : ((17 * 1024 * 1024)|tostring)}),
	} |
	.digests."0".segments = ["0","2"] |
	.digests."1".segments = ["1","3"] |
	.config.requirements.mandatory = ["online-reencrypt"]'
img_check_fail_repair_ok_data_shift

#
# NEW metadata (with reenc digest)
#
echo "[7] Reencryption with various mangled metadata"

# Normal situation
img_prepare
img_run_reenc_ok
img_check_ok

# The same in various steps.
# Repair must validate not only metadata, but also reencryption digest.
img_prepare
img_update_json 'del(.digests."2")'
img_check_fail_repair_ok

img_prepare '--reduce-device-size 2M'
img_update_json '.keyslots."2".area.shift_size = ((.keyslots."2".area.shift_size|tonumber / 2)|tostring)'
img_check_fail

img_prepare
img_update_json '
	.keyslots."2".area.type = "checksum" |
	.keyslots."2".area.hash = "sha256" |
	.keyslots."2".area.sector_size = 4096'
img_check_fail

img_prepare
img_update_json '.keyslots."2".area.type = "journal"'
img_check_fail

img_prepare
img_update_json '.keyslots."2".mode = "decrypt"'
img_check_fail

img_prepare
img_update_json '.keyslots."2".direction = "backward"'
img_check_fail

# key_size must be 1
img_prepare
img_update_json '.keyslots."2".key_size = 16'
img_check_fail

# Mangling segments
img_prepare
img_update_json 'del(.segments."1")'
img_check_fail

img_prepare
img_update_json '.segments."0".encryption = "aes-cbc-null"'
img_check_fail

img_prepare
img_update_json '.segments."1".encryption = "aes-cbc-null"'
img_check_fail

img_prepare
img_update_json '.segments."2".encryption = "aes-cbc-null"'
img_check_fail

# Mangling digests
img_prepare
img_update_json '
	.digests."2" = .digests."0" |
	.digests."2".keyslots = ["2"] |
	.digests."2".segments = []'
img_check_fail

img_prepare
img_update_json '.digests."2".iterations = 1111'
img_check_fail

# Simulate correct progress
img_prepare
img_update_json '
	.segments = {
		"0" : (.segments."0" +
			{"size" : ((1 * 1024 * 1024)|tostring)}),
		"1" : (.segments."0" +
			{"offset" : ((17 * 1024 * 1024)|tostring)}),
		"2" : .segments."1",
		"3" : .segments."2"
	} |
	.digests."0".segments = ["1","2"] |
	.digests."1".segments = ["0","3"]'
img_check_ok

# Mangling keyslots

# Set reencrypt slot to non-ignore priority
# This should be benign, just avoid noisy messages
img_prepare
img_update_json 'del(.keyslots."2".priority)'
img_check_ok

# Flags

# Remove mandatory reenc flag, but keep reenc metadata
img_prepare
img_update_json '.config.requirements.mandatory = []'
img_check_fail

# Unknown segment flag, should be ignored
img_prepare
img_update_json '.segments."0".flags = ["dead-parrot"]'
img_check_ok

echo "[8] Reencryption with AEAD is not supported"
img_prepare_raw
img_json_save
img_update_json '
	.segments."0".integrity = {
		"type" : "hmac(sha256)",
		"journal_encryption": "none",
		"journal_integrity": "none"
	}'
$CRYPTSETUP reencrypt $IMG $CS_PARAMS >/dev/null 2>&1 && fail

echo "[9] Decryption with datashift"
img_prepare_raw
$CRYPTSETUP reencrypt $CS_PARAMS --decrypt --init-only --force-offline-reencrypt --resilience checksum --header $IMG_HDR $IMG || fail
cp $IMG_HDR $IMG_HDR_BCP

# change hash
img_json_save $IMG_HDR_BCP
img_update_json '.keyslots."1".area.hash = "sha12345"' $IMG_HDR
$CRYPTSETUP reencrypt --header $IMG_HDR $IMG $CS_PARAMS --force-offline-reencrypt 2>/dev/null && fail

# change sector size
img_json_save $IMG_HDR_BCP
img_update_json '.keyslots."1".area.sector_size = 1024' $IMG_HDR
$CRYPTSETUP reencrypt --header $IMG_HDR $IMG $CS_PARAMS --force-offline-reencrypt 2>/dev/null && fail

# replace with new resilience mode
img_json_save $IMG_HDR_BCP
img_update_json 'del(.keyslots."1".area.hash) |
		 del(.keyslots."1".sector_size) |
		 .keyslots."1".area.type = "datashift-journal"' $IMG_HDR
$CRYPTSETUP reencrypt --header $IMG_HDR $IMG $CS_PARAMS --force-offline-reencrypt 2>/dev/null && fail

# downgrade reencryption requirement
img_json_save $IMG_HDR_BCP
img_update_json '.config.requirements.mandatory = ["online-reencrypt-v2"]' $IMG_HDR
$CRYPTSETUP reencrypt --header $IMG_HDR $IMG $CS_PARAMS --force-offline-reencrypt 2>/dev/null && fail

# change datashift value
img_json_save $IMG_HDR_BCP
img_update_json '.keyslots."1".area.shift_size = (((.keyslots."1".area.shift_size | tonumber) - 4096) | tostring)' $IMG_HDR
$CRYPTSETUP reencrypt --header $IMG_HDR $IMG $CS_PARAMS --force-offline-reencrypt 2>/dev/null && fail

remove_mapping
exit 0