disk_wiper/wiper.sh

#!/usr/bin/env bash

#prerequisites
#apt-get install pv smartmontools

REQUIRED_PKG="pv"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
  echo "No $REQUIRED_PKG. Setting up $REQUIRED_PKG."
  sudo apt-get --yes install $REQUIRED_PKG
fi

REQUIRED_PKG="smartmontools"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
  echo "No $REQUIRED_PKG. Setting up $REQUIRED_PKG."
  sudo apt-get --yes install $REQUIRED_PKG
fi

#collect data about disk type:
disk_type=$(smartctl -a /dev/$1 | grep -i "Rotation Rate:" | cut -d':' -f2 | tr -d " ")

#store if the disk is an ssd:
if [[ $disk_type == *"SolidStateDevice"* ]]; then
	disk_ssd=1
#	echo "disk is ssd"
elif [[ $disk_type == *"rpm"* ]]; then
	disk_ssd=0
#	echo "disk is not ssd"
else
	echo "disk type unknown, exiting"
	exit
fi

#check for disk errors, differntiating by device type since smart output is different between sata and sas drives:
if smartctl -a /dev/$1 | grep -q "SATA"; then
	#echo "Type of disk: SATA"
	if smartctl -a /dev/$1 | grep -q "No Errors Logged"; then
		echo "SATA no errors, conitnuing"
	else
		sata_model=$(smartctl -a /dev/$1 | grep -i "Device Model:" | cut -d':' -f2 | tr -d " ")
		sata_serial=$(smartctl -a /dev/$1 | grep -i "Serial number:" | cut -d':' -f2 | tr -d " ")
		echo "!!! ERRORS !!!"
		echo "SATA errors, aborting!!!"
		echo "NO WIPING NEEDED, JUST DESTROY THE DISK MECHANICALLY"
		echo "!!! EXITING !!!"
		echo ""
		echo "Model:  $sata_model"
		echo "Serial: $sata_serial"
		exit
	fi
elif smartctl -a /dev/$1 | grep -q "SAS"; then
	#echo "Type of disk: SAS"
	sas_errors=$(smartctl -a /dev/$1 | grep "Elements in grown defect list" | cut -d':' -f2 | tr -d " ")
	if [ "$sas_errors" -gt 0 ]; then
		sas_vendor=$(smartctl -a /dev/$1 | grep -i "Vendor:" | cut -d':' -f2 | tr -d " ")
		sas_model=$(smartctl -a /dev/$1 | grep -i "Product:" | cut -d':' -f2 | tr -d " ")
		sas_serial=$(smartctl -a /dev/$1 | grep -i "Serial number:" | cut -d':' -f2 | tr -d " ")
		echo "!!! ERRORS !!!"
		echo "Elements in grown defect list: " $sas_errors
		echo "NO WIPING NEEDED, JUST DESTROY THE DISK MECHANICALLY"
		echo "!!! EXITING !!!"
		echo ""
		echo "Vendor: $sas_vendor"
		echo "Model:  $sas_model"
		echo "Serial: $sas_serial"
		exit
	else
		echo "SAS no errors, continuing"
	fi
else
	echo "the disk type is none of the expected ones, exiting"
	exit
fi


#warning if is an ssd
if [ "$disk_ssd" -eq 1 ]; then
	echo "WARNING, DISK IS AN SSD, Remember that sectors are reallocated thus unwanted data might remain on the sectors"
#else
#	echo "disk is not an ssd, continuing"
fi

#calculate disk bytes:
disk_blocks=$(cat /proc/partitions | grep -w $1 | tr -s ' ' | cut -d " " -f4);
disk_bytes=$(( 1024*disk_blocks ))



echo "wiping $1"

echo "random pass n1:"
openssl enc -pbkdf2 -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv --progress --eta --rate --bytes --size $disk_bytes | dd of=/dev/$1 bs=2M oflag=direct iflag=fullblock
#openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv --progress --eta --rate --bytes --size $disk_bytes | dd of=/dev/$1 bs=1M

echo "random pass n2:"
openssl enc -pbkdf2 -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv --progress --eta --rate --bytes --size $disk_bytes | dd of=/dev/$1 bs=2M oflag=direct iflag=fullblock

echo "zeroing pass:"
dd if=/dev/zero of=/dev/$1 bs=1M status=progress oflag=direct

echo "!!! FINISHED wiping $1 !!!"





#OLD:
#echo "wiping $1"
#
#echo "random pass n1:"
#dd if=/dev/random of=/dev/$1 bs=1M status=progress oflag=direct
#
#echo "random pass n2:"
#dd if=/dev/random of=/dev/$1 bs=1M status=progress oflag=direct
#
#echo "zeroing pass:"
#dd if=/dev/zero of=/dev/$1 bs=1M status=progress oflag=direct
#
#echo "!!! FINISHED wiping $1 !!!"