# Reto contraseñas mysql (sha1, salt)

Introducción

En el reto 'networking 2' del wargame de sbd 2011 proporcionan un pcap con el proceso de autenticación contra una base de datos mysql.
Utilizaremos un salt y una contraseña distintos.
Salt: x8MXV%QLgDZ{ypGN6^Y#
Contraseña: d648fcba578670abf1ec93b0dce1b41f681dc71c

Ejecución

# cat diccionario.txt
hack
tracking
wargame
# cat mysql_sha1_salt.sh
#!/bin/bash

function dec2hex {
 printf %x $1
}
function hex2ascii {
 printf %s $1 | xxd -r -p
}
function hex2dec {
 printf %d $1
}
function sha1 {
 printf %s $1 | sha1sum | cut -d ' ' -f1
}
function xor {
 length=$[$1-1]
 string_a=$2
 string_b=$3
 for i in `seq 0 $length`
 do
  a=`hex2dec 0x${string_a:$i:1}`
  b=`hex2dec 0x${string_b:$i:1}`
  xored=$xored`dec2hex $(printf '%d' $[$a^$b])`
 done
 printf %s $xored
}

salt=$1
password_file=$2
captured_password=$3

while read secret
do
 hash_stage_1=`sha1 $secret`
 hash_stage_1_=`hex2ascii $hash_stage_1`
 #echo $hash_stage_1
 hash_stage_2=`sha1 $hash_stage_1_`
 hash_stage_2_=`hex2ascii $hash_stage_2`
 #echo $hash_stage_2
 hash_stage_3=`sha1 $salt$hash_stage_2_`
 #echo $hash_stage_3
 generated_password=`xor 40 $hash_stage_1 $hash_stage_3`
 #echo $generated_password
 if [ $generated_password == $captured_password ]
 then
  echo "$secret --> $captured_password"
 fi
done < $password_file
# ./mysql_sha1_salt.sh x8MXV%QLgDZ{ypGN6^Y# \
diccionario.txt \
d648fcba578670abf1ec93b0dce1b41f681dc71c
tracking --> d648fcba578670abf1ec93b0dce1b41f681dc71c