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keysaver.py
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keysaver.py
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#!/usr/bin/python3 -i
"""Module to store and generate passwords.
file syntax:
- version (2 byte), b'\x00\x01'
- encryption method (2 bytes):
- b'\x00\x01':
- argon2id to expand pw to 32 byte key with 32 byte salt
- 32 byte salt to derive a master token = sha256(salt + pw)
- AES GCM global encryption with 12 byte nonce
- AES CBC for passwords: 16 byte iv, token as key, no MAC
- b'\x00\x02':
as above, but with different argon2id params'
- dictionary stored as msgpack
- MAC of AES GCM with aad over version, method and salt
pwdic['name'] = {'info': {'description': 'a description', 'username': 'user', 'website': 'https://login.de'},
'update_ts': 1234567890, 'enc_data': b'salt and encrypted password'}
"""
import argon2
import datetime
import hashlib
import msgpack
import os
import pyperclip
import sys
import time
import webbrowser
from cryptography.exceptions import InvalidTag
from cryptography.hazmat.backends import default_backend as ht_backend
from cryptography.hazmat.primitives.ciphers import (
Cipher as HtCipher, algorithms as ht_algorithms, modes as ht_modes)
from cryptography.hazmat.primitives.ciphers.aead import AESGCM as HtAesGcm
from getpass import getpass
from ntlib.fctthread import ThreadLoop
from random import SystemRandom as _SystemRandom
from tabulate import tabulate
__author__ = 'NTI (lugino-emeritus) <*@*.de>'
__version__ = '0.3.16'
FILENAME = "pwdic"
PW_DEFAULT_LEN = 12
TOKEN_EXPIRATION = 300
_VERSION = b'\x00\x01'
_ENC_METHOD = b'\x00\x01'
#-------------------------------------------------------
def utc_ts() -> float:
return datetime.datetime.now(tz=datetime.timezone.utc).timestamp()
def _utc_msts48() -> int:
return int(utc_ts() * 1000) & (2**48-1)
sys_randint = _SystemRandom().randint # returns n with a <= n <= b
def _rand_lifetime() -> int:
return sys_randint(400*86400, 600*86400)
_salt_count = sys_randint(0, 2**32-1)
def _gen_salt(n: int) -> bytes:
global _salt_count
if n <= 10:
return os.urandom(n)
_salt_count = _salt_count+1 if _salt_count < 2**32-1 else 0
return b''.join((_utc_msts48().to_bytes(6, 'little'), _salt_count.to_bytes(4, 'little'), os.urandom(n-10)))
#-------------------------------------------------------
_RAND_CHARS = r'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
_RAND_SYMBOLS = r'!#$%&()*+,-./:;<=>?@[\]_{|}~'
def _list_shuffle(x: list) -> list:
# not use random.shuffle (probably no system random generator)
n = len(x) - 1
for i in range(n):
j = sys_randint(i, n)
(x[i], x[j]) = (x[j], x[i])
return x
def gen_rand_pw(n: int = PW_DEFAULT_LEN, symbols: str = _RAND_SYMBOLS) -> str:
chars = _RAND_CHARS + symbols
m = len(chars) - 1
if n < 6:
return ''.join(chars[sys_randint(0,m)] for _ in range(n))
pw = [chars[sys_randint(0,9)], chars[sys_randint(10,35)], chars[sys_randint(36,61)]]
if symbols:
pw.append(symbols[sys_randint(0, len(symbols)-1)])
n -= len(pw)
pw.extend(chars[sys_randint(0, m)] for _ in range(n))
return ''.join(_list_shuffle(pw))
#-------------------------------------------------------
def _yes_no_question(s: str) -> bool:
yes = {'yes', 'y', 'j', 'ja'}
no = {'no', 'n', 'nein'}
while True:
choice = input(s).lower()
if choice in yes:
return True
elif choice in no:
return False
else:
print("respond with 'yes' or 'no'")
def _read_new_pw() -> bytes:
pw = getpass('Enter new password: ')
while True:
while not pw:
pw = getpass('Choose a longer password: ')
if getpass('Repeat password: ') == pw:
return pw.encode()
pw = getpass('Passwords does not match, try again: ')
def _read_rand_pw() -> bytes:
data = input(f'To generate random password enter length > 0, 1 means default length ({PW_DEFAULT_LEN}): ')
if data:
try:
n = int(data)
if n:
if n == 1: n = PW_DEFAULT_LEN
pw = gen_rand_pw(n)
if _yes_no_question('New password created, copy to clipboard? '):
pyperclip.copy(pw)
return pw.encode()
except ValueError:
pass
return _read_new_pw()
#-------------------------------------------------------
class crypto:
# static namespace class for cryptography methods
@staticmethod
def aes_cbc_encrypt(key: bytes, data: bytes):
iv = _gen_salt(16)
data += b'\x80' + b'\x00' * ((15 - len(data)) % 16)
encryptor = HtCipher(ht_algorithms.AES(key), ht_modes.CBC(iv), ht_backend()).encryptor()
return iv + encryptor.update(data) + encryptor.finalize()
@staticmethod
def aes_cbc_decrypt(key: bytes, data: bytes):
iv, data = data[:16], data[16:]
decryptor = HtCipher(ht_algorithms.AES(key), ht_modes.CBC(iv), ht_backend()).decryptor()
data = decryptor.update(data) + decryptor.finalize()
return data.rpartition(b'\x80')[0]
@staticmethod
def aes_gcm_encrypt(key: bytes, data: bytes, aad: bytes = b''):
iv = _gen_salt(12)
return iv + HtAesGcm(key).encrypt(iv, data, aad)
@staticmethod
def aes_gcm_decrypt(key: bytes, data: bytes, aad: bytes = b''):
iv, data = data[:12], data[12:]
return HtAesGcm(key).decrypt(iv, data, aad)
@staticmethod
def argon2_param1_hash(key: bytes, salt: bytes):
return argon2.low_level.hash_secret_raw(
type=argon2.Type.ID, secret=key, salt=salt, hash_len=32,
time_cost=4, parallelism=4, memory_cost=524288)
@staticmethod
def argon2_param2_hash(key: bytes, salt: bytes):
return argon2.low_level.hash_secret_raw(
type=argon2.Type.ID, secret=key, salt=salt, hash_len=32,
time_cost=8, parallelism=8, memory_cost=1048576)
#-------------------------------------------------------
class DicSaver:
def __init__(self, filename: str):
self.filename = filename
self._method = None
self._enc_salt = None
self._enc_key = None
self._token_data = None
self._token = None
@property
def method(self) -> bytes:
return self._method
def _refresh_pw(self, pw: bytes) -> None:
if self._method == b'\x00\x00':
self._enc_salt = b''
self._enc_key = b''
elif self._method == b'\x00\x01':
self._enc_salt = _gen_salt(32)
self._enc_key = crypto.argon2_param1_hash(pw, self._enc_salt)
elif self._method == b'\x00\x02':
self._enc_salt = _gen_salt(32)
self._enc_key = crypto.argon2_param2_hash(pw, self._enc_salt)
else:
raise KeyError(f'method {self._method} unknown')
def _check_pw(self, pw: bytes) -> bool:
if self._method == b'\x00\x00':
return True
elif self._method == b'\x00\x01':
return crypto.argon2_param1_hash(pw, self._enc_salt) == self._enc_key
elif self._method == b'\x00\x02':
return crypto.argon2_param2_hash(pw, self._enc_salt) == self._enc_key
else:
raise KeyError(f'method {self._method} unknown')
def _set_token(self, pw: bytes) -> None:
if self._method == b'\x00\x00':
self._token = b''
elif self._method in {b'\x00\x01', b'\x00\x02'}:
self._token = hashlib.sha256(self._token_data + pw).digest()
else:
raise KeyError(f'method {self._method} unknown')
def get_token(self) -> bytes:
if self._token is None:
pw = getpass('Enter master password: ').encode()
while not self._check_pw(pw):
pw = getpass('Wrong password, try again: ').encode()
self._set_token(pw)
return self._token
def read(self) -> dict[str, dict]:
with open(self.filename, 'rb') as f:
data = f.read()
version, self._method, data = data[:2], data[2:4], data[4:]
if version != _VERSION:
raise Exception('version not supported')
salt_len = {b'\x00\x00': 0, b'\x00\x01': 32, b'\x00\x02': 32}[self._method]
salt, data = data[:salt_len], data[salt_len:]
aad = _VERSION + self._method + salt
pw = getpass('Enter master password: ').encode()
while True:
try:
if self._method == b'\x00\x00':
self._token_data = b''
elif self._method == b'\x00\x01':
key = crypto.argon2_param1_hash(pw, salt)
data = crypto.aes_gcm_decrypt(key, data, aad)
self._token_data, data = data[:32], data[32:]
elif self._method == b'\x00\x02':
key = crypto.argon2_param2_hash(pw, salt)
data = crypto.aes_gcm_decrypt(key, data, aad)
self._token_data, data = data[:32], data[32:]
else:
raise KeyError(f'method {self._method} unknown')
break
except InvalidTag:
pw = getpass('Wrong password, try again: ').encode()
self._refresh_pw(pw)
self._set_token(pw)
return msgpack.unpackb(data, raw=False)
def save(self, dic: dict) -> None:
data = msgpack.packb(dic, use_bin_type=True)
aad = _VERSION + self._method + self._enc_salt
if self._method == b'\x00\x00':
pass
elif self._method in {b'\x00\x01', b'\x00\x02'}:
data = self._token_data + data
data = crypto.aes_gcm_encrypt(self._enc_key, data, aad)
else:
raise KeyError(f'method {self._method} unknown')
with open(self.filename, 'wb') as f:
f.write(aad + data)
def change_pw(self, *, method: bytes|None = None) -> tuple[bytes, bytes]:
if self._enc_key:
pw = getpass('Enter current master password: ').encode()
while not self._check_pw(pw):
pw = getpass('Wrong password, try again: ').encode()
self._set_token(pw)
old_token = self._token
self._method = method or _ENC_METHOD
pw = _read_new_pw()
if self._method == b'\x00\x00':
self._token_data = b''
elif self._method in {b'\x00\x01', b'\x00\x02'}:
self._token_data = _gen_salt(32)
else:
raise KeyError(f'method {self._method} unknown')
self._refresh_pw(pw)
self._set_token(pw)
return self._token, old_token
class TokenDicSaver(DicSaver):
def __init__(self, filename: str):
super().__init__(filename)
self._alive_ts = 0
self._loop_ctl = ThreadLoop(self._loop)
def _loop(self) -> bool|None:
dt = self._alive_ts - time.time()
if dt > 30:
time.sleep(30)
elif dt > 0:
time.sleep(dt)
else:
self._token = None
return True
def _set_token(self, pw: bytes) -> None:
super()._set_token(pw)
self._alive_ts = time.time() + TOKEN_EXPIRATION
self._loop_ctl.start()
def get_token(self) -> bytes:
if self._loop_ctl.is_alive():
ts = time.time() + TOKEN_EXPIRATION
if ts > self._alive_ts:
self._alive_ts = ts
elif self._token is not None:
self._token = None
print('\nTOKEN SECURITY ISSUE!!!\n')
return super().get_token()
def _encrypt_data(token, data: bytes, *, method: bytes) -> bytes:
if method == b'\x00\x00':
return data
elif method in {b'\x00\x01', b'\x00\x02'}:
return crypto.aes_cbc_encrypt(token, data)
else:
raise KeyError(f'method {method} unknown')
def _decrypt_data(token, data: bytes, *, method: bytes) -> bytes:
if method == b'\x00\x00':
return data
elif method in {b'\x00\x01', b'\x00\x02'}:
return crypto.aes_cbc_decrypt(token, data)
else:
raise KeyError(f'method {method} unknown')
#-------------------------------------------------------
def read_dic() -> None:
global pwdic
pwdic = dic_saver.read()
def save_dic() -> None:
global pwdic
dic_saver.save(pwdic)
def get_token() -> bytes:
return dic_saver.get_token()
def change_mpw(method: bytes = _ENC_METHOD) -> None:
old_method = dic_saver.method
token, old_token = dic_saver.change_pw(method=method)
method = dic_saver.method
for name in pwdic:
pw = _decrypt_data(old_token, pwdic[name]['enc_data'], method=old_method)
pwdic[name]['enc_data'] = _encrypt_data(token, pw, method=method)
save_dic()
#-------------------------------------------------------
def set_pw(name: str, pw: bytes) -> None:
#pw must be a byte-like object
pwdic[name]['enc_data'] = _encrypt_data(dic_saver.get_token(), pw, method=dic_saver.method)
pwdic[name]['update_ts'] = int(utc_ts()) + _rand_lifetime()
save_dic()
def get_pw(name: str) -> str:
#return pw as string
return _decrypt_data(dic_saver.get_token(), pwdic[name]['enc_data'], method=dic_saver.method).decode()
def pw_info(name: str) -> None:
print(tabulate(sorted(pwdic[name]['info'].items())))
def show_pw(name: str, info: bool = False) -> None:
pw = get_pw(name)
if info:
pw_info(name)
print(f'password: {pw}')
else:
print(f"username: {pwdic[name]['info']['username']}, password: {pw}")
def copy_pw(name: str, info: bool = False) -> None:
pyperclip.copy(get_pw(name))
if info:
pw_info(name)
print('password copied')
else:
print(f"username: {pwdic[name]['info']['username']}, password copied")
def open_pw(name: str) -> None:
info = pwdic[name]['info']
website = info['website']
pw = get_pw(name)
username = info['username']
webbrowser.open(website)
pyperclip.copy(pw)
print(f'username: {username}, password copied')
def change_pw(name: str) -> None:
if _yes_no_question('Show current password? '):
show_pw(name)
pw = _read_rand_pw()
set_pw(name, pw)
def add_pw_line(name: str) -> None:
if name in pwdic and not _yes_no_question('Name already exists, overwrite? '):
return
pw_info = {}
pw_info['username'] = input('Username: ')
x = input('Website (optional): ')
if x: pw_info['website'] = x
x = input('Description (optional): ')
if x: pw_info['description'] = x
pw = _read_rand_pw()
while _yes_no_question('Do you want to add additional information? '):
x = input('Enter name of new key: ')
pw_info[x] = input(f'Enter {x}: ')
pwdic[name] = {'info': pw_info}
set_pw(name, pw)
def delete_pw_line(name: str) -> None:
pw_info(name)
if _yes_no_question(f'Do you really want to delete {name}? '):
del pwdic[name]
save_dic()
def copy_pw_line(name: str) -> None:
new_name = input('Enter new name: ')
if new_name in pwdic:
if not _yes_no_question('Name already exists, overwrite? '):
return
pwdic[new_name] = pwdic[name].copy()
save_dic()
def move_pw_line(name: str) -> None:
new_name = input('Enter new name: ')
if new_name in pwdic and not _yes_no_question('Name already exists, overwrite? '):
return
pwdic[new_name] = pwdic.pop(name)
save_dic()
def edit_pw_line(name: str) -> None:
pw_info(name)
info = pwdic[name]['info']
while True:
x = input('Enter name of (new) key: ')
if not x:
break
y = input(f"Enter {x} ('DEL' will delete the key): ")
if y == 'DEL':
if x in info:
del info[x]
else:
print('key does not exist')
else:
info[x] = y
save_dic()
def list_pw_lines(keys: tuple[str,...]|list[str]|str|None = ('username', 'website', 'description')):
"""Show all password lines with keys.
Default keys: username, website, description
to show all available info call list_pw_lines(None)
"""
if keys is None:
keys = sorted(set(k for v in pwdic.values() for k in v['info']))
elif isinstance(keys, str):
keys = (keys,)
a = []
for name in sorted(pwdic):
info = pwdic[name]['info']
l = [name]
l.extend(info.get(k, '') for k in keys)
a.append(l)
headers = ['NAME']
headers.extend(keys)
print(tabulate(a, headers=headers))
def check_lifetimes() -> None:
now = int(utc_ts())
to_update = tuple(name for (name, v) in pwdic.items() if v['update_ts'] < now)
if not (to_update and _yes_no_question('There are passwords to renew. Renew them now? ')):
return
for name in to_update:
if _yes_no_question(f'The lifetime of {name} expired. Do you want to change the password? '):
change_pw(name)
elif _yes_no_question('Do you want to extend the lifetime? '):
pwdic[name]['update_ts'] = now + _rand_lifetime()
save_dic()
#-------------------------------------------------------
if __name__ == '__main__':
filename = sys.argv[1] if len(sys.argv) > 1 else FILENAME
dic_saver = TokenDicSaver(filename)
if os.path.exists(filename):
read_dic()
check_lifetimes()
elif _yes_no_question(f"File '{filename}' not found, create a new password file? "):
pwdic = {}
change_mpw()