extensions/test/data/unpacker/bad_zip/bad_zip.sh

   1 #!/bin/bash -e
   2
   3 ## Copyright (c) 2012 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 # Purpose: Create a corrupt (invalid ZIP) version of a Chromium crx.
   8 if test $# -ne 2; then
   9   echo "Usage: bad_zip.sh <extension dir> <pem path>"
  10   exit 1
  11 fi
  12 dir=$1
  13 key=$2
  14 name=$(basename "$dir")
  15 crx="$name.crx"
  16 pub="$name.pub"
  17 sig="$name.sig"
  18 zip="$name.zip"
  19 trap 'rm -f "$pub" "$sig" "$zip"' EXIT
  20 # zip up the crx dir
  21 cwd=$(pwd -P)
  22 (cd "$dir" && zip -qr -9 -X "$cwd/$zip" .)
  23 # truncate the zip to 8K so it's invalid
  24 dd if=$zip of=$zip+ bs=1024 count=8 2>/dev/null && mv $zip+ $zip
  25 # signature
  26 openssl sha1 -sha1 -binary -sign "$key" < "$zip" > "$sig"
  27 # public key
  28 openssl rsa -pubout -outform DER < "$key" > "$pub" 2>/dev/null
  29 byte_swap () {
  30   # Take "abcdefgh" and return it as "ghefcdab"
  31   echo "${1:6:2}${1:4:2}${1:2:2}${1:0:2}"
  32 }
  33 crmagic_hex="4372 3234" # Cr24
  34 version_hex="0200 0000" # 2
  35 pub_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$pub" | awk '{print $5}')))
  36 sig_len_hex=$(byte_swap $(printf '%08x\n' $(ls -l "$sig" | awk '{print $5}')))
  37 (
  38   echo "$crmagic_hex $version_hex $pub_len_hex $sig_len_hex" | xxd -r -p
  39   cat "$pub" "$sig" "$zip"
  40 ) > "$crx"
  41 echo "Wrote $crx with invalid ZIP"