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pwdhash.py
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pwdhash.py
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#!/usr/bin/env python
import base64
import hmac
import itertools
import re
import sys
# Python 2.4 compatibility
try:
import hashlib
_md5 = hashlib.md5
except ImportError:
import md5
_md5 = md5
try:
next(iter("a"))
except NameError:
def next(x):
return x.next()
# Python 2.x and Python 3.0(?) compatiblity
try:
input = raw_input
except NameError:
pass
def b64_hmac_md5(key, data):
"""
return base64-encoded HMAC-MD5 for key and data, with trailing '='
stripped.
"""
bdigest = base64.b64encode(hmac.new(key, data, _md5).digest()).strip().decode("utf-8")
return re.sub('=+$', '', bdigest)
# set of domain suffixes to be kept
_domains = ["ab.ca", "ac.ac", "ac.at", "ac.be", "ac.cn", "ac.il",
"ac.in", "ac.jp", "ac.kr", "ac.nz", "ac.th", "ac.uk",
"ac.za", "adm.br", "adv.br", "agro.pl", "ah.cn", "aid.pl",
"alt.za", "am.br", "arq.br", "art.br", "arts.ro",
"asn.au", "asso.fr", "asso.mc", "atm.pl", "auto.pl",
"bbs.tr", "bc.ca", "bio.br", "biz.pl", "bj.cn", "br.com",
"cn.com", "cng.br", "cnt.br", "co.ac", "co.at", "co.il",
"co.in", "co.jp", "co.kr", "co.nz", "co.th", "co.uk",
"co.za", "com.au", "com.br", "com.cn", "com.ec", "com.fr",
"com.hk", "com.mm", "com.mx", "com.pl", "com.ro",
"com.ru", "com.sg", "com.tr", "com.tw", "cq.cn", "cri.nz",
"de.com", "ecn.br", "edu.au", "edu.cn", "edu.hk",
"edu.mm", "edu.mx", "edu.pl", "edu.tr", "edu.za",
"eng.br", "ernet.in", "esp.br", "etc.br", "eti.br",
"eu.com", "eu.lv", "fin.ec", "firm.ro", "fm.br", "fot.br",
"fst.br", "g12.br", "gb.com", "gb.net", "gd.cn", "gen.nz",
"gmina.pl", "go.jp", "go.kr", "go.th", "gob.mx", "gov.br",
"gov.cn", "gov.ec", "gov.il", "gov.in", "gov.mm",
"gov.mx", "gov.sg", "gov.tr", "gov.za", "govt.nz",
"gs.cn", "gsm.pl", "gv.ac", "gv.at", "gx.cn", "gz.cn",
"hb.cn", "he.cn", "hi.cn", "hk.cn", "hl.cn", "hn.cn",
"hu.com", "idv.tw", "ind.br", "inf.br", "info.pl",
"info.ro", "iwi.nz", "jl.cn", "jor.br", "jpn.com",
"js.cn", "k12.il", "k12.tr", "lel.br", "ln.cn", "ltd.uk",
"mail.pl", "maori.nz", "mb.ca", "me.uk", "med.br",
"med.ec", "media.pl", "mi.th", "miasta.pl", "mil.br",
"mil.ec", "mil.nz", "mil.pl", "mil.tr", "mil.za", "mo.cn",
"muni.il", "nb.ca", "ne.jp", "ne.kr", "net.au", "net.br",
"net.cn", "net.ec", "net.hk", "net.il", "net.in",
"net.mm", "net.mx", "net.nz", "net.pl", "net.ru",
"net.sg", "net.th", "net.tr", "net.tw", "net.za", "nf.ca",
"ngo.za", "nm.cn", "nm.kr", "no.com", "nom.br", "nom.pl",
"nom.ro", "nom.za", "ns.ca", "nt.ca", "nt.ro", "ntr.br",
"nx.cn", "odo.br", "on.ca", "or.ac", "or.at", "or.jp",
"or.kr", "or.th", "org.au", "org.br", "org.cn", "org.ec",
"org.hk", "org.il", "org.mm", "org.mx", "org.nz",
"org.pl", "org.ro", "org.ru", "org.sg", "org.tr",
"org.tw", "org.uk", "org.za", "pc.pl", "pe.ca", "plc.uk",
"ppg.br", "presse.fr", "priv.pl", "pro.br", "psc.br",
"psi.br", "qc.ca", "qc.com", "qh.cn", "re.kr",
"realestate.pl", "rec.br", "rec.ro", "rel.pl", "res.in",
"ru.com", "sa.com", "sc.cn", "school.nz", "school.za",
"se.com", "se.net", "sh.cn", "shop.pl", "sk.ca",
"sklep.pl", "slg.br", "sn.cn", "sos.pl", "store.ro",
"targi.pl", "tj.cn", "tm.fr", "tm.mc", "tm.pl", "tm.ro",
"tm.za", "tmp.br", "tourism.pl", "travel.pl", "tur.br",
"turystyka.pl", "tv.br", "tw.cn", "uk.co", "uk.com",
"uk.net", "us.com", "uy.com", "vet.br", "web.za",
"web.com", "www.ro", "xj.cn", "xz.cn", "yk.ca", "yn.cn",
"za.com"]
def extract_domain(host):
"""
Domain name extractor. Turns host names into domain names, ported
from pwdhash javascript code"""
host = re.sub('https?://', '', host)
host = re.match('([^/]+)', host).groups()[0]
domain = '.'.join(host.split('.')[-2:])
if domain in _domains:
domain = '.'.join(host.split('.')[-3:])
return domain
_password_prefix = '@@'
def generate(password, uri):
"""
generate the pwdhash password for master password and uri or
domain name.
"""
realm = extract_domain(uri)
if password.startswith(_password_prefix):
password = password[len(_password_prefix):]
password_hash = b64_hmac_md5(password.encode("utf-8"), realm.encode("utf-8"))
size = len(password) + len(_password_prefix)
nonalphanumeric = len(re.findall(r'\W', password)) != 0
return apply_constraints(password_hash, size, nonalphanumeric)
def apply_constraints(phash, size, nonalphanumeric):
"""
Fiddle with the password a bit after hashing it so that it will
get through most website filters. We require one upper and lower
case, one digit, and we look at the user's password to determine
if there should be at least one alphanumeric or not.
"""
starting_size = max(0, size - 4)
result = phash[:starting_size]
extras = itertools.chain((ord(ch) for ch in phash[starting_size:]),
itertools.repeat(0))
extra_chars = (chr(ch) for ch in extras)
nonword = re.compile(r'\W')
def next_between(start, end):
interval = ord(end) - ord(start) + 1
offset = next(extras) % interval
return chr(ord(start) + offset)
for elt, repl in (
(re.compile('[A-Z]'), lambda: next_between('A', 'Z')),
(re.compile('[a-z]'), lambda: next_between('a', 'z')),
(re.compile('[0-9]'), lambda: next_between('0', '9'))):
if len(elt.findall(result)) != 0:
result += next(extra_chars)
else:
result += repl()
if len(nonword.findall(result)) != 0 and nonalphanumeric:
result += next(extra_chars)
else:
result += '+'
while len(nonword.findall(result)) != 0 and not nonalphanumeric:
result = nonword.sub(next_between('A', 'Z'), result, 1)
amount = next(extras) % len(result)
result = result[amount:] + result[0:amount]
return result
def console_main():
import getpass, sys, os
if len(sys.argv) > 1:
domain = sys.argv[1]
else:
domain = input("domain: ").strip()
password = getpass.getpass("Password for %s: " % domain)
generated = generate(password, domain)
copied_to_clipboard = False
if sys.platform == "darwin":
import subprocess
try:
pb = subprocess.Popen("pbcopy", stdin=subprocess.PIPE,
stdout=open("/dev/null", "w"),
stderr=open("/dev/null", "w"))
pb.communicate(generated)
pb.wait()
if pb.returncode == 0:
copied_to_clipboard = True
except:
pass
elif 'DISPLAY' in os.environ:
try:
import gtk
clip = gtk.Clipboard()
clip.set_text(generated)
clip.store()
copied_to_clipboard = True
except:
pass
if copied_to_clipboard:
sys.stdout.write("Password was copied to clipboard.\n")
else:
sys.stdout.write(generated+"\n")
if __name__ == '__main__':
console_main()