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annotate sat/memory/crypto.py @ 3160:330a5f1d9eea

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core (memory/crypto): replaced `PyCrypto` by `cryptography`: `PyCrypto` is unmaintained for years but was used in SàT for password hashing. This patch fixes that by replacing `PyCrypto` by the reference `cryptography` module which is well maintained. The behaviour stays the same (except that previously async `hash`, `encrypt` and `decrypt` methods are now synchronous, as they are quick and using a deferToThread may actually be more resource intensive than using blocking methods). It is planed to improve `memory.crypto` by using more up-to-date cryptography/hashing algorithms in the future. PyCrypto is no more a dependency of SàT
author Goffi <goffi@goffi.org>
date Sun, 09 Feb 2020 23:50:26 +0100
parents 559a625a236b
children be6d91572633
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rev   line source
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1 #!/usr/bin/env python3
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2
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3 # SAT: a jabber client
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from os import urandom
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21 from base64 import b64encode, b64decode
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22 from cryptography.hazmat.primitives import hashes
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23 from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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24 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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25 from cryptography.hazmat.backends import default_backend
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28 crypto_backend = default_backend()
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30
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31 class BlockCipher:
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32
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33 BLOCK_SIZE = 16
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34 MAX_KEY_SIZE = 32
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35 IV_SIZE = BLOCK_SIZE # initialization vector size, 16 bits
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36
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37 @staticmethod
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38 def encrypt(key, text, leave_empty=True):
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39 """Encrypt a message.
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40
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41 Based on http://stackoverflow.com/a/12525165
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42
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43 @param key (unicode): the encryption key
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44 @param text (unicode): the text to encrypt
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45 @param leave_empty (bool): if True, empty text will be returned "as is"
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46 @return (D(str)): base-64 encoded encrypted message
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47 """
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48 if leave_empty and text == "":
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49 return ""
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50 iv = BlockCipher.getRandomKey()
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51 key = key.encode()
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52 key = (
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53 key[: BlockCipher.MAX_KEY_SIZE]
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54 if len(key) >= BlockCipher.MAX_KEY_SIZE
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55 else BlockCipher.pad(key)
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56 )
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58 cipher = Cipher(algorithms.AES(key), modes.CFB8(iv), backend=crypto_backend)
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59 encryptor = cipher.encryptor()
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60 encrypted = encryptor.update(BlockCipher.pad(text.encode())) + encryptor.finalize()
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61 return b64encode(iv + encrypted).decode()
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62
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63 @staticmethod
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64 def decrypt(key, ciphertext, leave_empty=True):
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65 """Decrypt a message.
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66
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67 Based on http://stackoverflow.com/a/12525165
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68
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69 @param key (unicode): the decryption key
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70 @param ciphertext (base-64 encoded str): the text to decrypt
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71 @param leave_empty (bool): if True, empty ciphertext will be returned "as is"
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72 @return: Deferred: str or None if the password could not be decrypted
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73 """
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74 if leave_empty and ciphertext == "":
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75 return ""
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76 ciphertext = b64decode(ciphertext)
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77 iv, ciphertext = (
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78 ciphertext[: BlockCipher.IV_SIZE],
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79 ciphertext[BlockCipher.IV_SIZE :],
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80 )
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81 key = key.encode()
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82 key = (
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83 key[: BlockCipher.MAX_KEY_SIZE]
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84 if len(key) >= BlockCipher.MAX_KEY_SIZE
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85 else BlockCipher.pad(key)
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86 )
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87
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88 cipher = Cipher(algorithms.AES(key), modes.CFB8(iv), backend=crypto_backend)
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89 decryptor = cipher.decryptor()
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90 decrypted = decryptor.update(ciphertext) + decryptor.finalize()
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91 return BlockCipher.unpad(decrypted)
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92
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93 @staticmethod
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94 def getRandomKey(size=None, base64=False):
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95 """Return a random key suitable for block cipher encryption.
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96
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97 Note: a good value for the key length is to make it as long as the block size.
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98
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99 @param size: key length in bytes, positive or null (default: BlockCipher.IV_SIZE)
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100 @param base64: if True, encode the result to base-64
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101 @return: str (eventually base-64 encoded)
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102 """
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103 if size is None or size < 0:
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104 size = BlockCipher.IV_SIZE
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105 key = urandom(size)
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106 return b64encode(key) if base64 else key
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107
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108 @staticmethod
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109 def pad(s):
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110 """Method from http://stackoverflow.com/a/12525165"""
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111 bs = BlockCipher.BLOCK_SIZE
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112 return s + (bs - len(s) % bs) * (chr(bs - len(s) % bs)).encode()
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113
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114 @staticmethod
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115 def unpad(s):
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116 """Method from http://stackoverflow.com/a/12525165"""
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117 s = s.decode()
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118 return s[0 : -ord(s[-1])]
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119
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120
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121 class PasswordHasher:
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122
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123 SALT_LEN = 16 # 128 bits
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124
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125 @staticmethod
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126 def hash(password, salt=None, leave_empty=True):
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127 """Hash a password.
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128
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129 @param password (str): the password to hash
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130 @param salt (base-64 encoded str): if not None, use the given salt instead of a random value
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131 @param leave_empty (bool): if True, empty password will be returned "as is"
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132 @return: Deferred: base-64 encoded str
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133 """
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134 if leave_empty and password == "":
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135 return ""
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136 salt = (
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137 b64decode(salt)[: PasswordHasher.SALT_LEN]
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138 if salt
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139 else urandom(PasswordHasher.SALT_LEN)
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140 )
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141
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142 # we use PyCrypto's PBKDF2 arguments while porting to crytography, to stay
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143 # compatible with existing installations. But this is temporary and we need
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144 # to update them to more secure values.
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145 kdf = PBKDF2HMAC(
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146 # FIXME: SHA1() is not secure, it is used here for historical reasons
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147 # and must be changed as soon as possible
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148 algorithm=hashes.SHA1(),
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149 length=16,
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150 salt=salt,
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151 iterations=1000,
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152 backend=crypto_backend
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153 )
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154 key = kdf.derive(password.encode())
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155 return b64encode(salt + key).decode()
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156
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157 @staticmethod
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158 def verify(attempt, pwd_hash):
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159 """Verify a password attempt.
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160
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161 @param attempt (str): the attempt to check
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162 @param pwd_hash (str): the hash of the password
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163 @return: Deferred: boolean
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164 """
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165 assert isinstance(attempt, str)
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166 assert isinstance(pwd_hash, str)
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167 leave_empty = pwd_hash == ""
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168 attempt_hash = PasswordHasher.hash(attempt, pwd_hash, leave_empty)
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169 assert isinstance(attempt_hash, str)
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170 return attempt_hash == pwd_hash