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annotate sat/memory/crypto.py @ 3078:95c94d94872d

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author Goffi <goffi@goffi.org>
date Mon, 18 Nov 2019 22:34:13 +0100
parents fee60f17ebac
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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7
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8 # This program is free software: you can redistribute it and/or modify
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9 # it under the terms of the GNU Affero General Public License as published by
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10 # the Free Software Foundation, either version 3 of the License, or
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11 # (at your option) any later version.
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12
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13 # This program is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 # GNU Affero General Public License for more details.
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17
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18 # You should have received a copy of the GNU Affero General Public License
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19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 try:
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22 from Crypto.Cipher import AES
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23 from Crypto.Protocol.KDF import PBKDF2
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24 except ImportError:
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25 raise Exception("PyCrypto is not installed.")
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26
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27 from os import urandom
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28 from base64 import b64encode, b64decode
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29 from twisted.internet.threads import deferToThread
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30 from twisted.internet.defer import succeed
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31
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32
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33 class BlockCipher(object):
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34
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35 BLOCK_SIZE = AES.block_size # 16 bits
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36 MAX_KEY_SIZE = AES.key_size[-1] # 32 bits = AES-256
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37 IV_SIZE = BLOCK_SIZE # initialization vector size, 16 bits
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38
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39 @classmethod
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40 def encrypt(cls, key, text, leave_empty=True):
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41 """Encrypt a message.
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42
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43 Based on http://stackoverflow.com/a/12525165
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44
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45 @param key (unicode): the encryption key
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46 @param text (unicode): the text to encrypt
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47 @param leave_empty (bool): if True, empty text will be returned "as is"
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48 @return (D(str)): base-64 encoded encrypted message
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49 """
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50 if leave_empty and text == "":
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51 return succeed(text)
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52 iv = BlockCipher.getRandomKey()
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53 key = key.encode("utf-8")
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54 key = (
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55 key[: BlockCipher.MAX_KEY_SIZE]
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56 if len(key) >= BlockCipher.MAX_KEY_SIZE
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57 else BlockCipher.pad(key)
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58 )
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59 cipher = AES.new(key, AES.MODE_CFB, iv)
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60 d = deferToThread(cipher.encrypt, BlockCipher.pad(text.encode("utf-8")))
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61 d.addCallback(lambda ciphertext: b64encode(iv + ciphertext))
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62 d.addCallback(lambda bytes_cypher: bytes_cypher.decode('utf-8'))
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63 return d
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64
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65 @classmethod
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66 def decrypt(cls, key, ciphertext, leave_empty=True):
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67 """Decrypt a message.
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68
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69 Based on http://stackoverflow.com/a/12525165
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70
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71 @param key (unicode): the decryption key
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72 @param ciphertext (base-64 encoded str): the text to decrypt
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73 @param leave_empty (bool): if True, empty ciphertext will be returned "as is"
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74 @return: Deferred: str or None if the password could not be decrypted
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75 """
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76 if leave_empty and ciphertext == "":
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77 return succeed("")
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78 ciphertext = b64decode(ciphertext)
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79 iv, ciphertext = (
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80 ciphertext[: BlockCipher.IV_SIZE],
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81 ciphertext[BlockCipher.IV_SIZE :],
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82 )
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83 key = key.encode("utf-8")
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84 key = (
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85 key[: BlockCipher.MAX_KEY_SIZE]
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86 if len(key) >= BlockCipher.MAX_KEY_SIZE
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87 else BlockCipher.pad(key)
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88 )
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89 cipher = AES.new(key, AES.MODE_CFB, iv)
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90 d = deferToThread(cipher.decrypt, ciphertext)
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91 d.addCallback(lambda text: BlockCipher.unpad(text))
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92 # XXX: cipher.decrypt gives no way to make the distinction between
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93 # a decrypted empty value and a decryption failure... both return
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94 # the empty value. Fortunately, we detect empty passwords beforehand
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95 # thanks to the "leave_empty" parameter which is used by default.
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96 d.addCallback(lambda text: text if text else None)
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97 return d
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98
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99 @classmethod
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100 def getRandomKey(cls, size=None, base64=False):
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101 """Return a random key suitable for block cipher encryption.
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102
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103 Note: a good value for the key length is to make it as long as the block size.
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104
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105 @param size: key length in bytes, positive or null (default: BlockCipher.IV_SIZE)
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106 @param base64: if True, encode the result to base-64
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107 @return: str (eventually base-64 encoded)
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108 """
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109 if size is None or size < 0:
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110 size = BlockCipher.IV_SIZE
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111 key = urandom(size)
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112 return b64encode(key) if base64 else key
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113
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114 @classmethod
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115 def pad(self, s):
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116 """Method from http://stackoverflow.com/a/12525165"""
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117 bs = BlockCipher.BLOCK_SIZE
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118 return s + (bs - len(s) % bs) * (chr(bs - len(s) % bs)).encode('utf-8')
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119
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120 @classmethod
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121 def unpad(self, s):
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122 """Method from http://stackoverflow.com/a/12525165"""
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123 s = s.decode('utf-8')
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124 return s[0 : -ord(s[-1])]
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125
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126
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127 class PasswordHasher(object):
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128
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129 SALT_LEN = 16 # 128 bits
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130
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131 @classmethod
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132 def hash(cls, password, salt=None, leave_empty=True):
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133 """Hash a password.
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134
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135 @param password (str): the password to hash
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136 @param salt (base-64 encoded str): if not None, use the given salt instead of a random value
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137 @param leave_empty (bool): if True, empty password will be returned "as is"
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138 @return: Deferred: base-64 encoded str
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139 """
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140 if leave_empty and password == "":
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141 return succeed("")
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142 salt = (
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143 b64decode(salt)[: PasswordHasher.SALT_LEN]
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144 if salt
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145 else urandom(PasswordHasher.SALT_LEN)
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146 )
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147 d = deferToThread(PBKDF2, password, salt)
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148 d.addCallback(lambda hashed: b64encode(salt + hashed))
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149 d.addCallback(lambda hashed_bytes: hashed_bytes.decode('utf-8'))
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150 return d
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151
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152 @classmethod
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153 def compare_hash(cls, hashed_attempt, hashed):
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154 assert isinstance(hashed, str)
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155 return hashed_attempt == hashed
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156
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157 @classmethod
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158 def verify(cls, attempt, hashed):
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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 hashed (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(hashed, str)
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167 leave_empty = hashed == ""
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168 d = PasswordHasher.hash(attempt, hashed, leave_empty)
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169 d.addCallback(cls.compare_hash, hashed=hashed)
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170 return d