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#!/bin/bash
. lib.sh
#
# *** Description ***
#
# generate primary with predefined json_size. There's only limited
# set of values allowed as json size in config section of LUKS2
# metadata
#
# secondary header is corrupted on purpose as well
#
# $1 full target dir
# $2 full source luks2 image
function prepare()
{
cp $SRC_IMG $TGT_IMG
test -d $TMPDIR || mkdir $TMPDIR
read_luks2_json0 $TGT_IMG $TMPDIR/json0
read_luks2_bin_hdr0 $TGT_IMG $TMPDIR/hdr0
read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr1
}
function generate()
{
# 1 MiB metadata
TEST_MDA_SIZE=$LUKS2_HDR_SIZE_1M
TEST_MDA_SIZE_BYTES=$((TEST_MDA_SIZE*512))
TEST_JSN_SIZE=$((TEST_MDA_SIZE-LUKS2_BIN_HDR_SIZE))
KEYSLOTS_OFFSET=$((TEST_MDA_SIZE*1024))
JSON_DIFF=$(((TEST_MDA_SIZE-LUKS2_HDR_SIZE)*1024))
JSON_SIZE=$((TEST_JSN_SIZE*512))
DATA_OFFSET=16777216
json_str=$(jq -c --arg jdiff $JSON_DIFF --arg jsize $JSON_SIZE --arg off $DATA_OFFSET \
'.keyslots[].area.offset |= ( . | tonumber + ($jdiff | tonumber) | tostring) |
.config.json_size = $jsize |
.segments."0".offset = $off' $TMPDIR/json0)
test -n "$json_str" || exit 2
test ${#json_str} -lt $((LUKS2_JSON_SIZE*512)) || exit 2
write_luks2_json "$json_str" $TMPDIR/json0 $TEST_JSN_SIZE
write_bin_hdr_size $TMPDIR/hdr0 $TEST_MDA_SIZE_BYTES
write_bin_hdr_size $TMPDIR/hdr1 $TEST_MDA_SIZE_BYTES
merge_bin_hdr_with_json $TMPDIR/hdr0 $TMPDIR/json0 $TMPDIR/area0 $TEST_JSN_SIZE
merge_bin_hdr_with_json $TMPDIR/hdr1 $TMPDIR/json0 $TMPDIR/area1 $TEST_JSN_SIZE
erase_checksum $TMPDIR/area0
chks0=$(calc_sha256_checksum_file $TMPDIR/area0)
write_checksum $chks0 $TMPDIR/area0
erase_checksum $TMPDIR/area1
chks0=$(calc_sha256_checksum_file $TMPDIR/area1)
write_checksum $chks0 $TMPDIR/area1
kill_bin_hdr $TMPDIR/area1
write_luks2_hdr0 $TMPDIR/area0 $TGT_IMG $TEST_MDA_SIZE
write_luks2_hdr1 $TMPDIR/area1 $TGT_IMG $TEST_MDA_SIZE
}
function check()
{
read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr_res1 $TEST_MDA_SIZE
local str_res1=$(head -c 6 $TMPDIR/hdr_res1)
test "$str_res1" = "VACUUM" || exit 2
read_luks2_json0 $TGT_IMG $TMPDIR/json_res0 $TEST_JSN_SIZE
jq -c --arg koff $KEYSLOTS_OFFSET --arg jsize $JSON_SIZE \
'if ([.keyslots[].area.offset] | map(tonumber) | min | tostring != $koff) or
(.config.json_size != $jsize)
then error("Unexpected value in result json") else empty end' $TMPDIR/json_res0 || exit 5
}
function cleanup()
{
rm -f $TMPDIR/*
rm -fd $TMPDIR
}
test $# -eq 2 || exit 1
TGT_IMG=$1/$(test_img_name $0)
SRC_IMG=$2
prepare
generate
check
cleanup
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