mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-16 10:00:39 +00:00
152 lines
5.4 KiB
Python
152 lines
5.4 KiB
Python
# Author:: Donald Stufft (<donald@stufft.io>)
|
|
# Copyright:: Copyright (c) 2013 Donald Stufft
|
|
# License:: Apache License, Version 2.0
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
from __future__ import absolute_import
|
|
from __future__ import division
|
|
|
|
import os
|
|
import re
|
|
import warnings
|
|
|
|
import six
|
|
|
|
from . import _bcrypt
|
|
from .__about__ import (
|
|
__author__, __copyright__, __email__, __license__, __summary__, __title__,
|
|
__uri__, __version__,
|
|
)
|
|
|
|
|
|
__all__ = [
|
|
"__title__", "__summary__", "__uri__", "__version__", "__author__",
|
|
"__email__", "__license__", "__copyright__",
|
|
"gensalt", "hashpw", "kdf", "checkpw",
|
|
]
|
|
|
|
|
|
_normalize_re = re.compile(br"^\$2y\$")
|
|
|
|
|
|
def gensalt(rounds=12, prefix=b"2b"):
|
|
if prefix not in (b"2a", b"2b"):
|
|
raise ValueError("Supported prefixes are b'2a' or b'2b'")
|
|
|
|
if rounds < 4 or rounds > 31:
|
|
raise ValueError("Invalid rounds")
|
|
|
|
salt = os.urandom(16)
|
|
output = _bcrypt.ffi.new("char[]", 30)
|
|
_bcrypt.lib.encode_base64(output, salt, len(salt))
|
|
|
|
return (
|
|
b"$" + prefix + b"$" + ("%2.2u" % rounds).encode("ascii") + b"$" +
|
|
_bcrypt.ffi.string(output)
|
|
)
|
|
|
|
|
|
def hashpw(password, salt):
|
|
if isinstance(password, six.text_type) or isinstance(salt, six.text_type):
|
|
raise TypeError("Unicode-objects must be encoded before hashing")
|
|
|
|
if b"\x00" in password:
|
|
raise ValueError("password may not contain NUL bytes")
|
|
|
|
# bcrypt originally suffered from a wraparound bug:
|
|
# http://www.openwall.com/lists/oss-security/2012/01/02/4
|
|
# This bug was corrected in the OpenBSD source by truncating inputs to 72
|
|
# bytes on the updated prefix $2b$, but leaving $2a$ unchanged for
|
|
# compatibility. However, pyca/bcrypt 2.0.0 *did* correctly truncate inputs
|
|
# on $2a$, so we do it here to preserve compatibility with 2.0.0
|
|
password = password[:72]
|
|
|
|
# When the original 8bit bug was found the original library we supported
|
|
# added a new prefix, $2y$, that fixes it. This prefix is exactly the same
|
|
# as the $2b$ prefix added by OpenBSD other than the name. Since the
|
|
# OpenBSD library does not support the $2y$ prefix, if the salt given to us
|
|
# is for the $2y$ prefix, we'll just mugne it so that it's a $2b$ prior to
|
|
# passing it into the C library.
|
|
original_salt, salt = salt, _normalize_re.sub(b"$2b$", salt)
|
|
|
|
hashed = _bcrypt.ffi.new("char[]", 128)
|
|
retval = _bcrypt.lib.bcrypt_hashpass(password, salt, hashed, len(hashed))
|
|
|
|
if retval != 0:
|
|
raise ValueError("Invalid salt")
|
|
|
|
# Now that we've gotten our hashed password, we want to ensure that the
|
|
# prefix we return is the one that was passed in, so we'll use the prefix
|
|
# from the original salt and concatenate that with the return value (minus
|
|
# the return value's prefix). This will ensure that if someone passed in a
|
|
# salt with a $2y$ prefix, that they get back a hash with a $2y$ prefix
|
|
# even though we munged it to $2b$.
|
|
return original_salt[:4] + _bcrypt.ffi.string(hashed)[4:]
|
|
|
|
|
|
def checkpw(password, hashed_password):
|
|
if (isinstance(password, six.text_type) or
|
|
isinstance(hashed_password, six.text_type)):
|
|
raise TypeError("Unicode-objects must be encoded before checking")
|
|
|
|
if b"\x00" in password or b"\x00" in hashed_password:
|
|
raise ValueError(
|
|
"password and hashed_password may not contain NUL bytes"
|
|
)
|
|
|
|
ret = hashpw(password, hashed_password)
|
|
|
|
if len(ret) != len(hashed_password):
|
|
return False
|
|
|
|
return _bcrypt.lib.timingsafe_bcmp(ret, hashed_password, len(ret)) == 0
|
|
|
|
|
|
def kdf(password, salt, desired_key_bytes, rounds, ignore_few_rounds=False):
|
|
if isinstance(password, six.text_type) or isinstance(salt, six.text_type):
|
|
raise TypeError("Unicode-objects must be encoded before hashing")
|
|
|
|
if len(password) == 0 or len(salt) == 0:
|
|
raise ValueError("password and salt must not be empty")
|
|
|
|
if desired_key_bytes <= 0 or desired_key_bytes > 512:
|
|
raise ValueError("desired_key_bytes must be 1-512")
|
|
|
|
if rounds < 1:
|
|
raise ValueError("rounds must be 1 or more")
|
|
|
|
if rounds < 50 and not ignore_few_rounds:
|
|
# They probably think bcrypt.kdf()'s rounds parameter is logarithmic,
|
|
# expecting this value to be slow enough (it probably would be if this
|
|
# were bcrypt). Emit a warning.
|
|
warnings.warn((
|
|
"Warning: bcrypt.kdf() called with only {0} round(s). "
|
|
"This few is not secure: the parameter is linear, like PBKDF2.")
|
|
.format(rounds),
|
|
UserWarning,
|
|
stacklevel=2,
|
|
)
|
|
|
|
key = _bcrypt.ffi.new("uint8_t[]", desired_key_bytes)
|
|
res = _bcrypt.lib.bcrypt_pbkdf(
|
|
password, len(password), salt, len(salt), key, len(key), rounds
|
|
)
|
|
_bcrypt_assert(res == 0)
|
|
|
|
return _bcrypt.ffi.buffer(key, desired_key_bytes)[:]
|
|
|
|
|
|
def _bcrypt_assert(ok):
|
|
if not ok:
|
|
raise SystemError("bcrypt assertion failed")
|