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py_django_crack

By Alexander Liu

Crack the django password on the way. By default Django use pbkdf2 and sha256 method to encrypt user's password. Once get the password stored in the database table, you need to compare it with others if brute force cracking. It is recommended that you use hash table comparison. The tool 'rainbow crack' can generate rainbow hash tables while another tool 'hashcat' brute-force cracks password from a dictionary alive. Because django uses PBKDF2(Password-Based Key Derivation Function 2), it would take too long to generate a password.

jake

  • The jake.py is the password encryption implementation which is derived from django

Branch py2 is only for Python 2: releases branch py2

Branch py3 and master are for Python 3

For Python3, you need install package promise first. pip3 install promise or pip3 install -r requirments-py3.txt

Usage

For entertainment only :)

To decrypt the password in the Django framework, you need to get the value which is stored in the database table 'auth_user' column 'password'.

For example the encryped password is:

pbkdf2_sha256$12000$Lz8oA7gW43mJ$N/DzMkLc/CX4oKHrU2bSPul3svNOmz8CYthM1JrR4Mo=

{algorithm}${iteration times}${salt}${encryped password}

In this case, pbkdf2_sha256 is the encryption algorithm, and 12000 is the iteration times,

Lz8oA7gW43mJ is the salt,

Lz8oA7gW43mJ$N/DzMkLc/CX4oKHrU2bSPul3svNOmz8CYthM1JrR4Mo= is the base64 encoded password

Note:

As of 2011, 10,000 iterations was the recommended default which took 100ms on a 2.2Ghz Core 2 Duo. This is probably the bare minimum for security given 1000 iterations was recommended in 2001.

This is also a standalone module derived from Django. Pure Python. Any other web framework can use this module.

When coding:

>>> import hashlib
>>> from jake import give_back_hashed
>>> from jake import get_base64_hashed
>>> a = get_base64_hashed('the_password', 'the_salt', 'iteration_times', 'the_hashlib_digest_object(the algorithm)')
>>> # a = get_base64_hashed('the_password', 'the_salt', 'iteration_times', hashlib.sha256)
>>> # this is the password which encrypted in the database table 'auth_user' column 'password'
>>> print a
N/DzMkLc/CX4oKHrU2bSPul3svNOmz8CYthM1JrR4Mo=
>>> # or you can do this
>>> import hashlib
>>> b = get_base64_hashed('the_password', 'the_salt', 'iteration_times', hashlib.sha256)
>>> print b
N/DzMkLc/CX4oKHrU2bSPul3svNOmz8CYthM1JrR4Mo=
>>> # To get the real sha256 hashed value
>>> c = give_back_hashed(b)
>>> print c
'7\xf0\xf32B\xdc\xfc%\xf8\xa0\xa1\xebSf\xd2>\xe9w\xb2\xf3N\x9b?\x02b\xd8L\xd4\x9a\xd1\xe0\xca'
>>> # you need other tools such as 'hashcat' or 'crack' to generate HASHes from 
>>> # a dictionay to compare them with this.

Tools

  • hashcat. This can crack password from hashes based on word dictionaries. There are tones of algorithms built-in. Good dictionary is important. hashcat offical link
  • rainbow table generator/cracker: rainbowcrack (rcrack, rt2rtc, rtc2rt, rsort, rtgen) . project-rainbowcrack link

Explanation

  • The rainbow table might be very large. Normally it would be like more than hundreds Giga Bytes. So you could download or make one by own. But sometimes it would take too long to generate the rainbow table. For instance in this case Django uses PBKDF2 and algorithm sha256 to encrypt password iteration by iteration, which means it will take very long to generate a single password or a HASH. So brute-force cracking is somehow lousy. Or you have super computer, things would be better. Sometimes you don't.
  • So the summery here is: To crack the django's password, there are two ways. 1) brute-force cracking which takes very long and hard-working on computer expense. 2) middle attack which means user's password can be captured alive. This has something to do with the art of deception. Pratical and social engineering.

How did I implant this in some python apps?

  • Use this module
import hashlib
from jake import get_base64_hashed
from jake import give_back_hashed
# for setting a new password in database
iter = 2000
salt = "random_salt"
a = get_base64_hashed('user_passw0rd', salt, iter, hashlib.sha256)
print(a)
>>> u'skqnMhYxGgIsxgz8vnFUMfq780bJo+Z88d+7L2YxGaE='
# so the full password stored in database actually should be
pw = "pbkdf2_sha256" + "$" + str(iter) + "$" + salt + "$" + a
# save it in database

# to compare
# 1) get the encrypted password from db and split it
# e.g. 
# real_encrypted is  pbkdf2_sha256$12000$Lz8oA7gW43mJ$N/DzMkLc/CX4oKHrU2bSPul3svNOmz8CYthM1JrR4Mo=
# let's store it as realpw
rp_list = realpw.split("$")
algo = rp_list[0]
iter = rp_list[1]
salt = rp_list[2]
secret = rp_list[3]

# try to create the same secret with the user realtime-input password
b = get_base64_hashed('user_tried_password', salt, iter, hashlib.sha256)

if give_back_hashed(b) == give_back_hashed(secret):
    print("Password correct")
else:
    print("Password incorrect")

For example, you can try this known encrypted password for test.

actual password: abc

algorithm: pbkdf2_sha256

iterations: 2000

salt: good_salt

secret: xDb4PWMWoQengkNyzh1IU3jGkZWK+BKManvkeJPunVQ=

The full pass should be : pbkdf2_sha256$2000$good_salt$xDb4PWMWoQengkNyzh1IU3jGkZWK+BKManvkeJPunVQ=

Use password abc or xyz to test the phrase

Happy hacking