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firepwd.py
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firepwd.py
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# decode Firefox passwords (https://github.com/lclevy/firepwd)
# lclevy@free.fr (28 Aug 2013: initial version, Oct 2016: support for logins.json)
# for educational purpose only, not production level
# now integrated into https://github.com/AlessandroZ/LaZagne
# tested with python 2.7
# key3.db is read directly, the 3rd party bsddb python module is NOT needed
# NSS library is NOT needed
from struct import unpack
import sys
from binascii import hexlify, unhexlify
import sqlite3
from base64 import b64decode
#https://pypi.python.org/pypi/pyasn1/
from pyasn1.codec.der import decoder
from hashlib import sha1
import hmac
from Crypto.Cipher import DES3
from Crypto.Util.number import long_to_bytes
from optparse import OptionParser
import json
def getShortLE(d, a):
return unpack('<H',(d)[a:a+2])[0]
def getLongBE(d, a):
return unpack('>L',(d)[a:a+4])[0]
#minimal 'ASN1 to string' function for displaying Key3.db contents
asn1Types = { 0x30: 'SEQUENCE', 4:'OCTETSTRING', 6:'OBJECTIDENTIFIER', 2: 'INTEGER', 5:'NULL' }
oidValues = { '2a864886f70d010c050103': '1.2.840.113549.1.12.5.1.3',
'2a864886f70d0307':'1.2.840.113549.3.7',
'2a864886f70d010101':'1.2.840.113549.1.1.1' }
def printASN1(d, l, rl):
type = ord(d[0])
length = ord(d[1])
if length&0x80 > 0: #http://luca.ntop.org/Teaching/Appunti/asn1.html,
nByteLength = length&0x7f
length = ord(d[2])
#Long form. Two to 127 octets. Bit 8 of first octet has value "1" and bits 7-1 give the number of additional length octets.
skip=1
else:
skip=0
#print '%x:%x' % ( type, length )
print ' '*rl, asn1Types[ type ],
if type==0x30:
print '{'
seqLen = length
readLen = 0
while seqLen>0:
#print seqLen, hexlify(d[2+readLen:])
len2 = printASN1(d[2+skip+readLen:], seqLen, rl+1)
#print 'l2=%x' % len2
seqLen = seqLen - len2
readLen = readLen + len2
print ' '*rl,'}'
return length+2
elif type==6: #OID
print oidValues[ hexlify(d[2:2+length]) ]
return length+2
elif type==4: #OCTETSTRING
print hexlify( d[2:2+length] )
return length+2
elif type==5: #NULL
print 0
return length+2
elif type==2: #INTEGER
print hexlify( d[2:2+length] )
return length+2
else:
if length==l-2:
printASN1( d[2:], length, rl+1)
return length
#extract records from a BSD DB 1.85, hash mode
def readBsddb(name):
f = open(name,'rb')
#http://download.oracle.com/berkeley-db/db.1.85.tar.gz
header = f.read(4*15)
magic = getLongBE(header,0)
if magic != 0x61561:
print 'bad magic number'
sys.exit()
version = getLongBE(header,4)
if version !=2:
print 'bad version, !=2 (1.85)'
sys.exit()
pagesize = getLongBE(header,12)
nkeys = getLongBE(header,0x38)
if options.verbose>1:
print 'pagesize=0x%x' % pagesize
print 'nkeys=%d' % nkeys
readkeys = 0
page = 1
nval = 0
val = 1
db1 = []
while (readkeys < nkeys):
f.seek(pagesize*page)
offsets = f.read((nkeys+1)* 4 +2)
offsetVals = []
i=0
nval = 0
val = 1
keys = 0
while nval != val :
keys +=1
key = getShortLE(offsets,2+i)
val = getShortLE(offsets,4+i)
nval = getShortLE(offsets,8+i)
#print 'key=0x%x, val=0x%x' % (key, val)
offsetVals.append(key+ pagesize*page)
offsetVals.append(val+ pagesize*page)
readkeys += 1
i += 4
offsetVals.append(pagesize*(page+1))
valKey = sorted(offsetVals)
for i in range( keys*2 ):
#print '%x %x' % (valKey[i], valKey[i+1])
f.seek(valKey[i])
data = f.read(valKey[i+1] - valKey[i])
db1.append(data)
page += 1
#print 'offset=0x%x' % (page*pagesize)
f.close()
db = {}
for i in range( 0, len(db1), 2):
db[ db1[i+1] ] = db1[ i ]
if options.verbose>1:
for i in db:
print '%s: %s' % ( repr(i), hexlify(db[i]) )
return db
def decrypt3DES( globalSalt, masterPassword, entrySalt, encryptedData ):
#see http://www.drh-consultancy.demon.co.uk/key3.html
hp = sha1( globalSalt+masterPassword ).digest()
pes = entrySalt + '\x00'*(20-len(entrySalt))
chp = sha1( hp+entrySalt ).digest()
k1 = hmac.new(chp, pes+entrySalt, sha1).digest()
tk = hmac.new(chp, pes, sha1).digest()
k2 = hmac.new(chp, tk+entrySalt, sha1).digest()
k = k1+k2
iv = k[-8:]
key = k[:24]
if options.verbose>0:
print 'key='+hexlify(key), 'iv='+hexlify(iv)
return DES3.new( key, DES3.MODE_CBC, iv).decrypt(encryptedData)
def decodeLoginData(data):
asn1data = decoder.decode(b64decode(data)) #first base64 decoding, then ASN1DERdecode
return asn1data[0][0].asOctets(), asn1data[0][1][1].asOctets(), asn1data[0][2].asOctets() #for login and password, keep :(key_id, iv, ciphertext)
def getLoginData():
conn = sqlite3.connect(options.directory+'signons.sqlite')
logins = []
c = conn.cursor()
try:
c.execute("SELECT * FROM moz_logins;")
except sqlite3.OperationalError: #since Firefox 32, json is used instead of sqlite3
loginf = open(options.directory+'logins.json','r').read()
jsonLogins = json.loads(loginf)
if 'logins' not in jsonLogins:
print 'error: no \'logins\' key in logins.json'
return []
for row in jsonLogins['logins']:
encUsername = row['encryptedUsername']
encPassword = row['encryptedPassword']
logins.append( (decodeLoginData(encUsername), decodeLoginData(encPassword), row['hostname']) )
return logins
#using sqlite3 database
for row in c:
encUsername = row[6]
encPassword = row[7]
if options.verbose>1:
print row[1], encUsername, encPassword
logins.append( (decodeLoginData(encUsername), decodeLoginData(encPassword), row[1]) )
return logins
def extractSecretKey(masterPassword):
#see http://www.drh-consultancy.demon.co.uk/key3.html
pwdCheck = key3['password-check']
if options.verbose>1:
print 'password-check='+hexlify(pwdCheck)
entrySaltLen = ord(pwdCheck[1])
entrySalt = pwdCheck[3: 3+entrySaltLen]
if options.verbose>1:
print 'entrySalt=%s' % hexlify(entrySalt)
encryptedPasswd = pwdCheck[-16:]
globalSalt = key3['global-salt']
if options.verbose>1:
print 'globalSalt=%s' % hexlify(globalSalt)
cleartextData = decrypt3DES( globalSalt, masterPassword, entrySalt, encryptedPasswd )
if cleartextData != 'password-check\x02\x02':
print 'password check error, Master Password is certainly used, please provide it with -p option'
sys.exit()
if unhexlify('f8000000000000000000000000000001') not in key3:
return None
privKeyEntry = key3[ unhexlify('f8000000000000000000000000000001') ]
saltLen = ord( privKeyEntry[1] )
nameLen = ord( privKeyEntry[2] )
#print 'saltLen=%d nameLen=%d' % (saltLen, nameLen)
privKeyEntryASN1 = decoder.decode( privKeyEntry[3+saltLen+nameLen:] )
data = privKeyEntry[3+saltLen+nameLen:]
printASN1(data, len(data), 0)
#see https://github.com/philsmd/pswRecovery4Moz/blob/master/pswRecovery4Moz.txt
entrySalt = privKeyEntryASN1[0][0][1][0].asOctets()
if options.verbose>0:
print 'entrySalt=%s' % hexlify(entrySalt)
privKeyData = privKeyEntryASN1[0][1].asOctets()
if options.verbose>0:
print 'privKeyData=%s' % hexlify(privKeyData)
privKey = decrypt3DES( globalSalt, masterPassword, entrySalt, privKeyData )
print 'decrypting privKeyData'
if options.verbose>0:
print 'decrypted=%s' % hexlify(privKey)
printASN1(privKey, len(privKey), 0)
privKeyASN1 = decoder.decode( privKey )
prKey= privKeyASN1[0][2].asOctets()
print 'decoding %s' % hexlify(prKey)
printASN1(prKey, len(prKey), 0)
prKeyASN1 = decoder.decode( prKey )
id = prKeyASN1[0][1]
key = long_to_bytes( prKeyASN1[0][3] )
if options.verbose>0:
print 'key=%s' % ( hexlify(key) )
return key
parser = OptionParser(usage="usage: %prog [options]")
parser.add_option("-v", "--verbose", type="int", dest="verbose", help="verbose level", default=0)
parser.add_option("-p", "--password", type="string", dest="masterPassword", help="masterPassword", default='')
parser.add_option("-d", "--dir", type="string", dest="directory", help="directory", default='')
(options, args) = parser.parse_args()
key3 = readBsddb(options.directory+'key3.db')
if ord(key3['Version']) == 3:
key = extractSecretKey(options.masterPassword)
logins = getLoginData()
if len(logins)==0:
print 'no stored passwords'
else:
print 'decrypting login/password pairs'
for i in logins:
print '%20s:' % i[2], #site URL
iv = i[0][1]
ciphertext = i[0][2] #login (PKCS#7 padding not removed)
print repr( DES3.new( key, DES3.MODE_CBC, iv).decrypt(ciphertext) ), ',',
iv = i[1][1]
ciphertext = i[1][2] #passwd (PKCS#7 padding not removed)
print repr( DES3.new( key, DES3.MODE_CBC, iv).decrypt(ciphertext) )
else:
print 'error key3.db version != 3'
sys.exit()