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annotate sat/memory/crypto.py @ 3696:52ee22d78e18

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plugin XEP-0384: fix encryption for user own devices: our own jid is added automatically by OMEMO library, but during the generation of the stanza, our list of jids was used to get the keys (and thus our own jid and devices keys was missing). fix 402
author Goffi <goffi@goffi.org>
date Fri, 22 Oct 2021 18:46:51 +0200
parents be6d91572633
children 524856bd7b19
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rev   line source
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ab2696e34d29 Python 3 port:
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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) 2009-2021 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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57
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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