#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright 2018 Google LLC
#
# FS QA Test generic/576
#
# Test using fs-verity and fscrypt simultaneously.  This primarily verifies
# correct ordering of the hooks for each feature: fscrypt needs to be first.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	_restore_fsverity_signatures
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/verity
. ./common/encrypt

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here
_supported_fs generic
_supported_os Linux
_require_scratch_verity
_require_scratch_encryption
_require_command "$KEYCTL_PROG" keyctl
_disable_fsverity_signatures

_scratch_mkfs_encrypted_verity &>> $seqres.full
_scratch_mount

fsv_orig_file=$tmp.file
edir=$SCRATCH_MNT/edir
fsv_file=$edir/file.fsv

# Set up an encrypted directory.
_new_session_keyring
keydesc=$(_generate_session_encryption_key)
mkdir $edir
_set_encpolicy $edir $keydesc

# Create a file within the encrypted directory and enable verity on it.
# Then check that it has an encryption policy as well.
head -c 100000 /dev/zero > $fsv_orig_file
cp $fsv_orig_file $fsv_file
_fsv_enable $fsv_file
echo
$XFS_IO_PROG -r -c "get_encpolicy" $fsv_file | _filter_scratch \
	| sed 's/Master key descriptor:.*/Master key descriptor: 0000000000000000/'
echo

# Verify that the file contents are as expected.  This should be going through
# both the decryption and verity I/O paths.
cmp $fsv_orig_file $fsv_file && echo "Files matched"

# Just in case, try again after a mount cycle to empty the page cache.
_scratch_cycle_mount
cmp $fsv_orig_file $fsv_file && echo "Files matched"

# Corrupt some bytes as a sanity check that fs-verity is really working.
# This also verifies that the data on-disk is really encrypted, since otherwise
# the data being written here would be identical to the old data.
head -c 1000 /dev/zero | _fsv_scratch_corrupt_bytes $fsv_file 50000
md5sum $fsv_file |& _filter_scratch

# success, all done
status=0
exit