tests/generic/625

#! /bin/bash
# SPDX-License-Identifier: GPL-2.0-only
# Copyright 2021 Google LLC
#
# FS QA Test No. 625
#
# Test retrieving the built-in signature of a verity file using
# FS_IOC_READ_VERITY_METADATA.
#
# This is separate from the other tests for FS_IOC_READ_VERITY_METADATA because
# the fs-verity built-in signature support is optional.
#
. ./common/preamble
_begin_fstest auto quick verity

. ./common/filter
. ./common/verity

_require_scratch_verity
_require_fsverity_builtin_signatures

_scratch_mkfs_verity &>> $seqres.full
_scratch_mount

echo -e "\n# Setting up signed verity file"
_fsv_generate_cert $tmp.key $tmp.cert $tmp.cert.der
_fsv_clear_keyring
_fsv_load_cert $tmp.cert.der
fsv_file=$SCRATCH_MNT/file
echo foo > $fsv_file
_fsv_sign $fsv_file $tmp.sig --key=$tmp.key --cert=$tmp.cert >> $seqres.full
_fsv_enable $fsv_file --signature=$tmp.sig
_require_fsverity_dump_metadata $fsv_file

echo -e "\n# Dumping and comparing signature"
_fsv_dump_signature $fsv_file > $tmp.sig2
# The signature returned by FS_IOC_READ_VERITY_METADATA should exactly match the
# one we passed to FS_IOC_ENABLE_VERITY earlier.
cmp $tmp.sig $tmp.sig2

echo -e "\n# Dumping and comparing signature (in chunks)"
sig_size=$(stat -c %s $tmp.sig)
for (( i = 0; i < sig_size; i += 13 )); do
	_fsv_dump_signature $fsv_file --offset=$i --length=13
done > $tmp.sig2
cmp $tmp.sig $tmp.sig2

# success, all done
status=0
exit