60 lines
1.2 KiB
Bash
Executable file
60 lines
1.2 KiB
Bash
Executable file
#!/bin/bash
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. lib.sh
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#
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# *** Description ***
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#
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# generate primary header with well-formed json but missing
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# trailing null byte.
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#
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# secondary header is corrupted on purpose as well
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#
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# $1 full target dir
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# $2 full source luks2 image
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PATTERN="\"config\":{"
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KEY="\"config_key\":\""
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function generate()
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{
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read -r json_str < $TMPDIR/json0
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json_len=${#json_str}
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pindex=$(strindex $json_str $PATTERN)
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test $pindex -gt 0 || exit 2
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offset=${#PATTERN}
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offset=$((offset+pindex))
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key_len=${#KEY}
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remain=$((LUKS2_JSON_SIZE*512-key_len-json_len-1)) # -1: closing '"'
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if [ ${json_str:offset:1} = "}" ]; then
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format_str="%s%s%s"
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else
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format_str="%s%s,%s"
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remain=$((remain-1)) # also count with separating ','
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fi
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test $remain -gt 0 || exit 2
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fill=$(repeat_str "X" $remain)
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fill=$(repeat_str "X" $remain)"\""
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printf $format_str $KEY $fill ${json_str:$offset} | _dd of=$TMPDIR/json0 bs=1 seek=$offset conv=notrunc
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lib_mangle_json_hdr0_kill_hdr1
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}
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function check()
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{
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lib_hdr1_killed || exit 2
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lib_hdr0_checksum || exit 2
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read_luks2_json0 $TGT_IMG $TMPDIR/json_res0
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read -r json_str_res0 < $TMPDIR/json_res0
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test ${#json_str_res0} -eq $((LUKS2_JSON_SIZE*512)) || exit 2
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}
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lib_prepare $@
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generate
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check
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lib_cleanup
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