#!/bin/bash

CIPHER_XTS_PLAIN="aes-xts-plain64"
CIPHER_CBC_ESSIV="aes-cbc-essiv:sha256"
CIPHER_CBC_TCW="serpent-cbc-tcw"
# TODO: mode with LMK

TEST_KEYRING_NAME="keyringtest_keyring"

LOGON_KEY_16_OK="dmtst:lkey_16"
LOGON_KEY_32_OK="dmtst:lkey_32"
LOGON_KEY_64_OK="dmtst:lkey_64"

HEXKEY_16="be21aa8c733229347bd4e681891e213d";
HEXKEY_32="bb21158c733229347bd4e681891e213d94c685be6a5b84818afe7a78a6de7a1a";
HEXKEY_64="34f95b96abff946b64f1339ff8653cc77c38697c93b797a496f3786e86eed7781850d5112bbae17d209b8310a8f3a034f1cd297667bc0cd1438fad28d87ef6a1"

DEVSIZEMB=16
DEVSECTORS=$((DEVSIZEMB*1024*1024/512))
NAME=testcryptdev
CHKS_DMCRYPT=vk_in_dmcrypt.chk
CHKS_KEYRING=vk_in_keyring.chk

PWD="aaa"
CRYPTSETUP=../cryptsetup

function remove_mapping()
{
	[ -b /dev/mapper/$NAME ] && dmsetup remove $NAME

	# unlink whole test keyring
	[ -n "$TEST_KEYRING" ] && keyctl unlink $TEST_KEYRING "@u" >/dev/null

	rmmod scsi_debug 2>/dev/null

	rm -f $CHKS_DMCRYPT $CHKS_KEYRING
}

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

function fail()
{
	[ -n "$1" ] && echo "$1"
	echo "FAILED at $(caller)"
	remove_mapping
	exit 2
}

# $1 hexbyte key
# $2 type
# $3 description
# $4 keyring
function load_key()
{
	local tmp="$1"
	shift
	echo -n "$tmp" | xxd -r -p | keyctl padd $@ >/dev/null
}

function dm_crypt_keyring_support()
{
	VER_STR=$(dmsetup targets | grep crypt | cut -f2 -dv)
	[ -z "$VER_STR" ] && fail "Failed to parse dm-crypt version."

	VER_MAJ=$(echo $VER_STR | cut -f 1 -d.)
	VER_MIN=$(echo $VER_STR | cut -f 2 -d.)

	# run the test with dm-crypt v1.15.0+ on purpose
	# the fix is in dm-crypt v1.18.1+
	[ $VER_MAJ -gt 1 ] && return 0
	[ $VER_MAJ -lt 1 ] && return 1
	[ $VER_MIN -ge 15 ]
}

function test_and_prepare_keyring() {
	keyctl list "@s" > /dev/null || skip "Current session keyring is unreachable, test skipped"
	TEST_KEYRING=$(keyctl newring $TEST_KEYRING_NAME "@u" 2> /dev/null)
	test -n "$TEST_KEYRING" || skip "Failed to create keyring in user keyring"
	keyctl search "@s" keyring "$TEST_KEYRING" > /dev/null 2>&1 || keyctl link "@u" "@s" > /dev/null 2>&1
	load_key "$HEXKEY_16" user test_key "$TEST_KEYRING" || skip "Kernel keyring service is useless on this system, test skipped."
}

add_device() {
	modprobe scsi_debug $@ delay=0
	if [ $? -ne 0 ] ; then
		echo "This kernel seems to not support proper scsi_debug module, test skipped."
		exit 77
	fi

	sleep 2
	DEV=$(grep -l -e scsi_debug /sys/block/*/device/model | cut -f4 -d /)

	DEV="/dev/$DEV"
	[ -b $DEV ] || fail "Cannot find $DEV."
}

[ $(id -u) != 0 ] && skip "WARNING: You must be root to run this test, test skipped."
which dmsetup >/dev/null 2>&1 || skip "Cannot find dmsetup, test skipped"
which keyctl >/dev/null 2>&1 || skip "Cannot find keyctl, test skipped"
which xxd >/dev/null 2>&1 || skip "Cannot find xxd, test skipped"
which sha1sum > /dev/null 2>&1 || skip "Cannot find sha1sum, test skipped"
modprobe dm-crypt || fail "dm-crypt failed to load"
dm_crypt_keyring_support || skip "dm-crypt doesn't support kernel keyring, test skipped."

test_and_prepare_keyring

add_device dev_size_mb=$DEVSIZEMB

dd if=/dev/urandom of=$DEV bs=1M count=$DEVSIZEMB oflag=direct > /dev/null 2>&1 || fail

#test aes cipher with xts mode, plain IV
echo -n "Testing $CIPHER_XTS_PLAIN..."
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_XTS_PLAIN $HEXKEY_32 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
load_key "$HEXKEY_32" logon  $LOGON_KEY_32_OK "$TEST_KEYRING" || fail "Cannot load 32 byte logon key type"
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_XTS_PLAIN :32:logon:$LOGON_KEY_32_OK 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksums mismatch (corruption)"
# same test using message
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_XTS_PLAIN $HEXKEY_32 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_XTS_PLAIN $HEXKEY_32 0 $DEV 0" || fail
dmsetup suspend $NAME || fail
dmsetup message $NAME 0 key wipe || fail
dmsetup message $NAME 0 "key set :32:logon:$LOGON_KEY_32_OK" || fail
dmsetup resume $NAME || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksums mismatch (corruption)"
echo "OK"

#test aes cipher, xts mode, essiv IV
echo -n "Testing $CIPHER_CBC_ESSIV..."
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_ESSIV $HEXKEY_16 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
load_key "$HEXKEY_16" logon  $LOGON_KEY_16_OK "$TEST_KEYRING" || fail "Cannot load 16 byte logon key type"
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_ESSIV :16:logon:$LOGON_KEY_16_OK 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksums mismatch (corruption)"
# same test using message
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_ESSIV $HEXKEY_16 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_ESSIV $HEXKEY_16 0 $DEV 0" || fail
dmsetup suspend $NAME || fail
dmsetup message $NAME 0 key wipe || fail
dmsetup message $NAME 0 "key set :16:logon:$LOGON_KEY_16_OK" || fail
dmsetup resume $NAME || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksums mismatch (corruption)"
echo "OK"

#test serpent cipher, cbc mode, tcw IV
echo -n "Testing $CIPHER_CBC_TCW..."
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_TCW $HEXKEY_64 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
load_key "$HEXKEY_64" logon  $LOGON_KEY_64_OK "$TEST_KEYRING" || fail "Cannot load 16 byte logon key type"
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_TCW :64:logon:$LOGON_KEY_64_OK 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksum mismatch (corruption)"
# same test using message
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_TCW $HEXKEY_64 0 $DEV 0" || fail
sha1sum /dev/mapper/$NAME > $CHKS_DMCRYPT || fail
dmsetup remove $NAME || fail
dmsetup create $NAME --table "0 $DEVSECTORS crypt $CIPHER_CBC_TCW $HEXKEY_64 0 $DEV 0" || fail
dmsetup suspend $NAME || fail
dmsetup message $NAME 0 key wipe || fail
dmsetup message $NAME 0 "key set :64:logon:$LOGON_KEY_64_OK" || fail
dmsetup resume $NAME || fail
sha1sum /dev/mapper/$NAME > $CHKS_KEYRING || fail
dmsetup remove $NAME || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksums mismatch (corruption)"
echo "OK"

echo -n "Test LUKS2 key refresh..."
echo $PWD | $CRYPTSETUP luksFormat --type luks2 --luks2-metadata-size 16k --luks2-keyslots-size 4064k --pbkdf pbkdf2 --pbkdf-force-iterations 1000 --force-password $DEV || fail
echo $PWD | $CRYPTSETUP open $DEV $NAME || fail
$CRYPTSETUP status $NAME | grep -q -i "location:.*keyring" || skip "LUKS2 can't use keyring. Test skipped."
dd if=/dev/mapper/$NAME bs=1M iflag=direct status=none | sha1sum > $CHKS_KEYRING || fail
echo $PWD | $CRYPTSETUP refresh $NAME --disable-keyring || fail
$CRYPTSETUP status $NAME | grep -q -i "location:.*keyring" && fail "Key is still in keyring"
dd if=/dev/mapper/$NAME bs=1M iflag=direct status=none | sha1sum > $CHKS_DMCRYPT || fail
diff $CHKS_DMCRYPT $CHKS_KEYRING || fail "Plaintext checksum mismatch (corruption)"
echo "OK"

remove_mapping