Undelete with Sleuthkit

Wrote a little Bash script using Sleuthkit tools to recover a deleted file from a partion. Tested the script with ext2 and fat32 filesystems.

Setup a test image:

dd  if=/dev/zero of=image  bs=1k count=8192
mkfs.ext2 image
mount -o loop image /mnt/image
cp something /mnt/image
rm /mnt/image/something
sync
umount /mnt/image

Now you can start the script to find a token of the deleted file:

./find.sh image “Test”

The Code for find.sh

#!/bin/sh
 
IMAGE=$1
TOKEN=$2
BSIZE=1024
TYPE="linux-ext2"
TMP="dls_$(date +%Y%d%m_%H%M%S)"
 
if [ $# -ne 2 ]
then
    echo "Usage: $0 image token"
    exit -1
fi
 
if [ ! -f $IMAGE ]
then
  echo "Cannot find $IMAGE"
  exit -1
fi
 
if [  -z "$TOKEN" ]
then
  echo "Pleae give search token"
  exit -1
fi
 
echo "--------------------------"
echo "Found deleted"
fls -f $TYPE -rd $IMAGE
dls -f $TYPE $IMAGE > $TMP
strings -t d $TMP > $TMP.str
echo "--------------------------"
grep -i "$TOKEN" $TMP.str
echo "--------------------------"
echo -en "Select Offset:"
read n
ADDR=$(grep -i "$TOKEN" $TMP.str | grep "$n" |  sed 's/^[ \t]*//' | head -n 1 | cut -d " " -f1)
if [ -z "$ADDR" ]
then
    echo "Nothing found for '$TOKEN'"
    exit -1
fi
echo "Found $ADDR"
OFFSET=$(echo "$ADDR / $BSIZE" | bc)
echo "Using Offset $OFFSET"
BLOCK=$(dcalc -f $TYPE  -u $OFFSET  $IMAGE)
echo "Using Block $BLOCK"
echo "----------------------------"
dcat -f $TYPE  $IMAGE  $BLOCK
echo
echo "----------------------------"
INODE=$(ifind -f $TYPE  $IMAGE -d $BLOCK)
echo "Found Inode $INODE"
istat -f $TYPE $IMAGE $INODE
BLOCKS=$(istat -f $TYPE $IMAGE $INODE | tail -n 1)
echo "---------------------------"
echo "Found Blocks $BLOCKS"
echo "---------------------------"
(for BLOCK in $BLOCKS
do
   dcat -f $TYPE  $IMAGE  $BLOCK
done) | tee $TMP.found
echo "---------------------------"
echo "Saved to $TMP.found"
echo "---------------------------"
rm -f $TMP $TMP.str

Leave a Reply