Simplified encryption logic

This commit is contained in:
Anon 2022-10-08 17:35:02 -07:00
parent 9975eaab63
commit 08206db1d9

View File

@ -28,13 +28,11 @@ from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from collections import OrderedDict
class PasswordMismatch(Exception):
class EncryptionFail(Exception):
pass
# Salts
def generate_salt():
return os.urandom(16)
class PasswordMismatch(Exception):
pass
# Return string from bytes
@ -72,8 +70,7 @@ def derive_key(password, salt):
iterations=100000,
backend=default_backend()
)
r_key = base64.urlsafe_b64encode(kdf.derive(password))
return r_key
return base64.urlsafe_b64encode(kdf.derive(password))
# Encryption functions
@ -99,94 +96,62 @@ def decrypt(token, key):
# encryption_function: encrypt(message, key) : decrypt(token, key):
# Returns settings_server_decrypted dictionary with Byte() values. Will need to use
# ChangeEncodingDict to make them strings (recommended cfg file friendly)
def __settings_server(password, salt, settings_server, encryption_function):
def encrypt_settings(settings_server, password, salt, encryption_function):
key = derive_key(password, salt)
settings_server_decrypted = OrderedDict()
for setting in settings_server:
settings_server_decrypted[setting] = encryption_function(settings_server[setting], key)
return settings_server_decrypted
# Returns (salt, settings_server)
def _settings_server_encrypt(settings_server):
salt = generate_salt()
password = getpass.getpass("Enter password: ")
password2 = getpass.getpass("Retype Password: ")
if password != password2:
raise PasswordMismatch
settings_server_encrypted = __settings_server(password.encode(), salt, encode_dict(settings_server), encrypt)
return salt, settings_server_encrypted
def get_keyfile(keyfile=None):
if keyfile is not None:
with open(keyfile, "rb") as f:
return f.read()
return None
# Returns (settings_server)
def _settings_server_decrypt(settings_server, settings_encrypt):
settings_server_encoded = encode_dict(settings_server)
if settings_encrypt["encrypt"]:
salt = salt_decode(settings_encrypt["salt"])
password = getpass.getpass("Enter password: ")
return __settings_server(password.encode(), salt, settings_server_encoded, decrypt)
else:
return settings_server_encoded
# Wrapper function that will catch exceptions and exit
def settings_server_new(function, **kwargs):
def get_pass(q):
try:
return function(**kwargs)
# If the user cancels the login
return getpass.getpass(q).encode()
except KeyboardInterrupt:
print("\nQuitting...")
raise EncryptionFail("\nQuitting...")
# If the user passwords do not match (encrypt)
except PasswordMismatch:
print("Passwords do not match...")
# Incorrect password entered (decrypt)
except InvalidToken:
print("Password or Token Incorrect...")
# Probably the salt value got modified
except base64.binascii.Error:
print("Salt is invalid...")
# Some other kind of fuck up
def settings_server_encrypt(settings_server, keyfile=None):
try:
settings_server = encode_dict(settings_server)
salt = os.urandom(16)
password = get_keyfile(keyfile)
if password is None:
password = get_pass("Enter password: ")
password2 = get_pass("Enter password: ")
if password != password2:
raise PasswordMismatch("Passwords do not match")
encrypted = encrypt_settings(settings_server, password, salt, encrypt)
return salt_encode(salt), decode_dict(encrypted)
except PasswordMismatch as e:
raise EncryptionFail(str(e))
except Exception as e:
print("Unknown exception occurred...")
print(e)
# Exit if an exception was thrown
sys.exit(1)
err = str(e)
raise EncryptionFail("Encrypt Error: {}".format(err))
# Glue functions that package **kwargs automatically
def settings_server_encrypt(settings_server):
kwargs = {"settings_server": settings_server}
return settings_server_new(_settings_server_encrypt, **kwargs)
def settings_server_decrypt(settings_server, settings_encrypt):
kwargs = {
"settings_server": settings_server,
"settings_encrypt": settings_encrypt
}
return settings_server_new(_settings_server_decrypt, **kwargs)
# The _cfg functions should return a regular string
# These are the functions that should interface with the bot a return a plain string
# settings_server ordered dictionary
def settings_server_encrypt_cfg(settings_server):
salt, settings_server = settings_server_encrypt(settings_server)
return salt_encode(salt), decode_dict(settings_server)
def settings_server_decrypt_cfg(settings_server, settings_encrypt):
settings_server = settings_server_decrypt(settings_server, settings_encrypt)
return decode_dict(settings_server)
def settings_server_decrypt(settings_server, settings_encrypt, keyfile=None):
try:
if not settings_encrypt["encrypt"]:
return settings_server
settings_server = encode_dict(settings_server)
password = get_keyfile(keyfile or settings_encrypt["keyfile"]) or get_pass("Enter password: ")
salt = salt_decode(settings_encrypt["salt"])
decrypted = encrypt_settings(settings_server, password, salt, decrypt)
return decode_dict(decrypted)
except base64.binascii.Error:
raise EncryptionFail("Salt is invalid")
except InvalidToken:
raise EncryptionFail("Password or token is incorrect")
except Exception as e:
err = str(e)
raise EncryptionFail("Decrypt Error: {}".format(err))
def main():
@ -202,6 +167,7 @@ def main():
parser.add_argument("--encrypt", help="Generate encrypted authentication.", action="store_true")
parser.add_argument("--decrypt", help="Decrypt encrypted authentication", action="store_true")
parser.add_argument("--recrypt", help="Recrypt encrypted authentication", action="store_true")
parser.add_argument("-k", "--keyfile", help="Keyfile used for decryption", default=None)
parser.add_argument("-c", "--cfg", help="Specify config file.", default=default_cfg)
arguments = parser.parse_args()
@ -214,25 +180,28 @@ def main():
import importlib
cfg = importlib.import_module(arguments.cfg)
settings_server = cfg.settings_server
settings_encrypt = None
settings_encrypt = cfg.settings_encrypt
keyfile = arguments.keyfile or settings_encrypt["keyfile"]
if arguments.decrypt and arguments.encrypt:
print("Re-encrypting")
if arguments.decrypt: # arguments.decrypt
print("Decrypt...")
settings_server = settings_server_decrypt_cfg(cfg.settings_server, cfg.settings_encrypt)
settings_server = settings_server_decrypt(settings_server, settings_encrypt, arguments.keyfile)
settings_encrypt = OrderedDict([
("encrypt", False),
("salt", cfg.settings_encrypt["encrypt"])
("encrypt", False),
("salt", settings_encrypt["salt"]),
("keyfile", arguments.keyfile)
])
if arguments.encrypt:
print("Encrypt...")
salt, settings_server = settings_server_encrypt_cfg(settings_server)
salt, settings_server = settings_server_encrypt(settings_server, keyfile)
settings_encrypt = OrderedDict([
("encrypt", True),
("salt", salt)
("encrypt", True),
("salt", salt),
("keyfile", arguments.keyfile)
])
print("settings_server = {}".format(pformat(settings_server)))
@ -241,4 +210,8 @@ def main():
if __name__ == "__main__":
sys.exit(main())
try:
sys.exit(main())
except EncryptionFail as e:
print(e)
sys.exit(1)