tests/generators/generate-luks2-missing-trailing-null-byte-json0.img.sh

   1 #!/bin/bash
   2
   3 . lib.sh
   4
   5 #
   6 # *** Description ***
   7 #
   8 # generate primary header with well-formed json but missing
   9 # trailing null byte.
  10 #
  11 # secondary header is corrupted on purpose as well
  12 #
  13
  14 # $1 full target dir
  15 # $2 full source luks2 image
  16
  17 PATTERN="\"config\":{"
  18 KEY="\"config_key\":\""
  19
  20 function prepare()
  21 {
  22         cp $SRC_IMG $TGT_IMG
  23         test -d $TMPDIR || mkdir $TMPDIR
  24         read_luks2_json0 $TGT_IMG $TMPDIR/json0
  25         read_luks2_bin_hdr0 $TGT_IMG $TMPDIR/hdr0
  26         read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr1
  27 }
  28
  29 function generate()
  30 {
  31         read -r json_str < $TMPDIR/json0
  32         json_len=${#json_str}
  33         pindex=$(strindex $json_str $PATTERN)
  34         test $pindex -gt 0 || exit 2
  35
  36         offset=${#PATTERN}
  37         offset=$((offset+pindex))
  38         key_len=${#KEY}
  39         remain=$((LUKS2_JSON_SIZE*512-key_len-json_len-1)) # -1: closing '"'
  40         if [ ${json_str:offset:1} = "}" ]; then
  41                 format_str="%s%s%s"
  42         else
  43                 format_str="%s%s,%s"
  44                 remain=$((remain-1)) # also count with separating ','
  45         fi
  46         test $remain -gt 0 || exit 2
  47
  48         fill=$(repeat_str "X" $remain)
  49         fill=$(repeat_str "X" $remain)"\""
  50
  51         printf $format_str $KEY $fill ${json_str:$offset} | _dd of=$TMPDIR/json0 bs=1 seek=$offset conv=notrunc
  52
  53         merge_bin_hdr_with_json $TMPDIR/hdr0 $TMPDIR/json0 $TMPDIR/area0
  54         erase_checksum $TMPDIR/area0
  55         chks0=$(calc_sha256_checksum_file $TMPDIR/area0)
  56         write_checksum $chks0 $TMPDIR/area0
  57         write_luks2_hdr0 $TMPDIR/area0 $TGT_IMG
  58         kill_bin_hdr $TMPDIR/hdr1
  59         write_luks2_hdr1 $TMPDIR/hdr1 $TGT_IMG
  60 }
  61
  62 function check()
  63 {
  64         read_luks2_bin_hdr1 $TGT_IMG $TMPDIR/hdr_res1
  65         local str_res1=$(head -c 6 $TMPDIR/hdr_res1)
  66         test "$str_res1" = "VACUUM" || exit 2
  67
  68         read_luks2_json0 $TGT_IMG $TMPDIR/json_res0
  69         chks_res0=$(read_sha256_checksum $TGT_IMG)
  70         test "$chks0" = "$chks_res0" || exit 2
  71         read -r json_str_res0 < $TMPDIR/json_res0
  72         test ${#json_str_res0} -eq $((LUKS2_JSON_SIZE*512)) || exit 2
  73 }
  74
  75 function cleanup()
  76 {
  77         rm -f $TMPDIR/*
  78         rm -fd $TMPDIR
  79 }
  80
  81 test $# -eq 2 || exit 1
  82
  83 TGT_IMG=$1/$(test_img_name $0)
  84 SRC_IMG=$2
  85
  86 prepare
  87 generate
  88 check
  89 cleanup