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275 lines
9.2 KiB
Python
Executable File
275 lines
9.2 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Script to extract the "hash" from a password protected key3.db or key4.db file.
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#
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# This code is based on the tool "firepwd" (https://github.com/lclevy/firepwd (GPL-license)
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# Although the code has been changed a bit, all credit goes to @lclevy for his initial work.
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#
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# Tested with Python 3.8.5 and the following libraries: PyCryptodome 3.10.1 and pyasn1 0.4.8
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#
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# Author:
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# https://github.com/Banaanhangwagen
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# https://github.com/mneitsabes
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# License: MIT
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#
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import argparse
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from collections import namedtuple
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import enum
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import binascii
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import hashlib
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import hmac
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import os
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import sqlite3
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import struct
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import sys
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from Crypto.Cipher import AES, DES3
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from pyasn1.codec.der import decoder
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class MasterPasswordInfos:
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def __init__(self, mode, global_salt, entry_salt, cipher_text, no_master_password, iteration=None, iv=None):
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if mode not in ['aes', '3des']:
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raise ValueError('Bad mode')
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self.mode = mode
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self.global_salt = global_salt
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self.entry_salt = entry_salt
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self.cipher_text = cipher_text
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self.no_master_password = no_master_password
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self.iteration = iteration
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self.iv = iv
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def read_bsd_db(db_filepath: str) -> {}:
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"""
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Read the key3.db.
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:param db_filepath: the database filepath
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:type db_filepath: str
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:return: the dict
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:rtype: dict
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"""
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with open(db_filepath, 'rb') as f:
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header = f.read(4 * 15)
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magic = struct.unpack('>L', header[0:4])[0]
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if magic != 0x61561:
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raise ValueError('Bad magic number')
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version = struct.unpack('>L', header[4:8])[0]
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if version != 2:
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raise ValueError('Bad version')
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pagesize = struct.unpack('>L', header[12:16])[0]
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nkeys = struct.unpack('>L', header[56:60])[0]
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readkeys = 0
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page = 1
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db1 = []
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while readkeys < nkeys:
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f.seek(pagesize*page)
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offsets = f.read((nkeys+1) * 4 + 2)
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offset_vals = []
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i = 0
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nval = 0
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val = 1
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keys = 0
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while nval != val:
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keys += 1
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key = struct.unpack('<H', offsets[(2+i):(2+i)+2])[0]
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val = struct.unpack('<H', offsets[(4+i):(4+i)+2])[0]
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nval = struct.unpack('<H', offsets[(8+i):(8+i)+2])[0]
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offset_vals.append(key + (pagesize * page))
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offset_vals.append(val + (pagesize * page))
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readkeys += 1
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i += 4
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offset_vals.append(pagesize * (page + 1))
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val_key = sorted(offset_vals)
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for i in range(keys * 2):
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f.seek(val_key[i])
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data = f.read(val_key[i+1] - val_key[i])
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db1.append(data)
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page += 1
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db = {}
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for i in range(0, len(db1), 2):
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db[db1[i+1]] = db1[i]
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return db
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def is_decrypting_mozilla_3des_without_master_password(global_salt, entry_salt, cipher_text):
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"""
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Indicate if the cipher_text can be decrypted to 'password-check\x02\x02' without a master password
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in the the "mozilla 3DES"
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:param global_salt: the global salt
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:param entry_salt: the entry salt
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:param cipher_text: the encrypted text
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:return: the decrypted text
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"""
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hp = hashlib.sha1(global_salt).digest()
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pes = entry_salt + b'\x00'*(20-len(entry_salt))
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chp = hashlib.sha1(hp + entry_salt).digest()
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k1 = hmac.new(chp, pes + entry_salt, hashlib.sha1).digest()
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tk = hmac.new(chp, pes, hashlib.sha1).digest()
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k2 = hmac.new(chp, tk + entry_salt, hashlib.sha1).digest()
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k = k1 + k2
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iv = k[-8:]
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key = k[:24]
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return DES3.new(key, DES3.MODE_CBC, iv).decrypt(cipher_text) == b'password-check\x02\x02'
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def is_decrypting_pbe_aes_without_password(global_salt, entry_salt, iteration, iv, cipher_text):
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"""
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Indicate if the cipher_text can be decrypted to password-check\x02\x02' without a master password
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in the the AES mode.
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:param global_salt: the global salt
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:param entry_salt: the entry salt
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:param iteration: the number of iteration
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:param iv: the iv
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:param cipher_text: the encrypted text
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:return: the decrypted text
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"""
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k = hashlib.sha1(global_salt).digest()
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key = hashlib.pbkdf2_hmac('sha256', k, entry_salt, iteration, dklen=32)
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return AES.new(key, AES.MODE_CBC, iv).decrypt(cipher_text) == b'password-check\x02\x02'
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def extract_master_password_infos(db_filepath: str, db_version: int) -> MasterPasswordInfos:
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"""
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Extract the master password information from the database.
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:param db_filepath: the db filepath
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:type db_filepath: str
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:param db_version: the db_type, 3 or 4
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:type db_version: int
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:return: the infos
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:rtype: MasterPasswordInfos
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"""
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if db_version not in [3, 4]:
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raise ValueError('db_version not supported')
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if db_version == 3:
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db_values = read_bsd_db(db_filepath)
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global_salt = db_values[b'global-salt']
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pwd_check = db_values[b'password-check']
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entry_salt_len = pwd_check[1]
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entry_salt = pwd_check[3: 3 + entry_salt_len]
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cipher_text = pwd_check[-16:]
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no_master_password = is_decrypting_mozilla_3des_without_master_password(global_salt, entry_salt, cipher_text)
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return MasterPasswordInfos('3des', global_salt, entry_salt, cipher_text, no_master_password)
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else:
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db = sqlite3.connect(db_filepath)
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c = db.cursor()
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c.execute('SELECT item1,item2 FROM metadata WHERE id = "password"')
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global_salt, encoded_item2 = c.fetchone()
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decoded_item2 = decoder.decode(encoded_item2)
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pbe_algo = str(decoded_item2[0][0][0])
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if pbe_algo == '1.2.840.113549.1.12.5.1.3': # pbeWithSha1AndTripleDES-CBC
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entry_salt = decoded_item2[0][0][1][0].asOctets()
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cipher_text = decoded_item2[0][1].asOctets()
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no_master_password = is_decrypting_mozilla_3des_without_master_password(global_salt, entry_salt,
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cipher_text)
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return MasterPasswordInfos('3des', global_salt, entry_salt, cipher_text, no_master_password)
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elif pbe_algo == '1.2.840.113549.1.5.13': # pkcs5 pbes2
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assert str(decoded_item2[0][0][1][0][0]) == '1.2.840.113549.1.5.12'
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assert str(decoded_item2[0][0][1][0][1][3][0]) == '1.2.840.113549.2.9'
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assert str(decoded_item2[0][0][1][1][0]) == '2.16.840.1.101.3.4.1.42'
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assert int(decoded_item2[0][0][1][0][1][2]) == 32 # key length
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entry_salt = decoded_item2[0][0][1][0][1][0].asOctets()
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iteration = int(decoded_item2[0][0][1][0][1][1])
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iv = b'\x04\x0e' + decoded_item2[0][0][1][1][1].asOctets()
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cipher_text = decoded_item2[0][1].asOctets()
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no_master_password = is_decrypting_pbe_aes_without_password(global_salt, entry_salt, iteration, iv,
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cipher_text)
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return MasterPasswordInfos('aes', global_salt, entry_salt, cipher_text, no_master_password, iteration, iv)
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def hex(b) -> str:
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"""
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Returns the hexily version of the binary datas.
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:param b: binary datas
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:return: the string
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"""
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return binascii.hexlify(b).decode('utf8')
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def get_hashcat_string(mpinfos: MasterPasswordInfos) -> str:
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"""
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Print the hashchat format string.
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:param mpinfos: the infos
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:type mpinfos: MasterPasswordInfos
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:return: the string
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:rtype: str
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"""
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if mpinfos.no_master_password:
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return 'No Primary Password is set.'
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else:
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s = '$mozilla$*'
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if mpinfos.mode == '3des':
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s += f'3DES*{hex(mpinfos.global_salt)}*{hex(mpinfos.entry_salt)}*{hex(mpinfos.cipher_text)}'
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else:
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s += f'AES*{hex(mpinfos.global_salt)}*{hex(mpinfos.entry_salt)}*{mpinfos.iteration}*' \
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f'{hex(mpinfos.iv)}*{hex(mpinfos.cipher_text)}'
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return s
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if __name__ == '__main__':
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usage = 'python3 mozilla2hashcat.py <profile_directory or key3/4.db file>\n'
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parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter, usage=usage)
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parser.add_argument('dir_or_db', help='The directory containing the key3/4.db-file or the key3/4.db-file itself')
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args = parser.parse_args()
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db_filepath = None
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db_type = None
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if os.path.isdir(args.dir_or_db):
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db3_filepath = os.path.join(args.dir_or_db, 'key3.db')
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db4_filepath = os.path.join(args.dir_or_db, 'key4.db')
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if os.path.exists(db3_filepath):
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db_filepath = db3_filepath
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db_type = 3
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elif os.path.exists(db4_filepath):
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db_filepath = db4_filepath
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db_type = 4
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elif os.path.isfile(args.dir_or_db):
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filename = os.path.basename(args.dir_or_db)
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if filename == 'key3.db':
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db_filepath = args.dir_or_db
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db_type = 3
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elif filename == 'key4.db':
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db_filepath = args.dir_or_db
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db_type = 4
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if not db_filepath:
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sys.stderr.write('key3.db or key4.db file not found\n')
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exit(-1)
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infos = extract_master_password_infos(db_filepath, db_type)
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print(get_hashcat_string(infos))
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