Sun, 19 Jun 2011 15:19:46 +0200
Added capability to encrypt saved passwords with a master password and rearranged some configuration parameters related to security.
1127
b1802ebe0066
Added capability to encrypt saved passwords with a master password and rearranged some configuration parameters related to security.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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1 | # -*- coding: utf-8 -*- |
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Added capability to encrypt saved passwords with a master password and rearranged some configuration parameters related to security.
Detlev Offenbach <detlev@die-offenbachs.de>
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2 | |
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3 | # Copyright (c) 2011 Detlev Offenbach <detlev@die-offenbachs.de> |
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4 | # |
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5 | |
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6 | """ |
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7 | Package implementing cryptography related functionality. |
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8 | """ |
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9 | |
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10 | ##import os |
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11 | ##import sys |
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12 | ##sys.path.insert(1, os.path.join(os.path.dirname(__file__), "../..")) |
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13 | ## |
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14 | import random |
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15 | import base64 |
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16 | |
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17 | from PyQt4.QtCore import QCoreApplication |
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18 | from PyQt4.QtGui import QLineEdit, QInputDialog |
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19 | |
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20 | from E5Gui import E5MessageBox |
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21 | |
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22 | from .py3AES import encryptData, decryptData |
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23 | from .py3PBKDF2 import verifyPassword, hashPasswordTuple, rehashPassword |
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24 | ##from py3AES import encryptData, decryptData |
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25 | ##from py3PBKDF2 import verifyPassword, hashPasswordTuple, rehashPassword |
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26 | |
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27 | import Preferences |
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28 | |
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29 | ################################################################################ |
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30 | ## password handling functions below |
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31 | ################################################################################ |
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32 | |
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33 | |
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34 | EncodeMarker = "CE4" |
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35 | CryptoMarker = "CR5" |
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36 | |
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37 | Delimiter = "$" |
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38 | |
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39 | MasterPassword = None |
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40 | |
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41 | |
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42 | def pwEncode(pw): |
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43 | """ |
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44 | Module function to encode a password. |
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45 | |
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46 | @param pw password to encode (string) |
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47 | @return encoded password (string) |
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48 | """ |
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49 | pop = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,;:-_!$?*+#" |
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50 | rpw = "".join(random.sample(pop, 32)) + pw + "".join(random.sample(pop, 32)) |
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51 | return EncodeMarker + base64.b64encode(rpw.encode("utf-8")).decode("ascii") |
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52 | |
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53 | |
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54 | def pwDecode(epw): |
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55 | """ |
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56 | Module function to decode a password. |
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57 | |
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58 | @param epw encoded password to decode (string) |
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59 | @return decoded password (string) |
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60 | """ |
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61 | if not epw.startswith(EncodeMarker): |
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62 | return epw # it was not encoded using pwEncode |
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63 | |
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64 | return base64.b64decode(epw[3:].encode("ascii"))[32:-32].decode("utf-8") |
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65 | |
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66 | |
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67 | ##def passwordHash(pw): |
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68 | ## """ |
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69 | ## Module function to calculate the hash for the given password. |
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70 | ## |
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71 | ## This is done by hashing it 65.000 times with SHA1 in order to make brute force |
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72 | ## attacks a bit harder. |
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73 | ## |
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74 | ## @param pw password to be hashed (string) |
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75 | ## @return password hash (string) |
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76 | ## """ |
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77 | ## hash = QCryptographicHash.hash(QByteArray(pw.encode("utf-8")), |
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78 | ## QCryptographicHash.Sha1) |
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79 | ## for i in range(65000): |
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80 | ## hash = QCryptographicHash.hash(hash, QCryptographicHash.Sha1) |
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81 | ## return base64.b64encode(bytes(hash)).decode("ascii") |
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82 | ## |
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83 | ## |
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84 | ##def generateCryptoKey(pw, keyLength=32): |
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85 | ## """ |
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86 | ## Module function to calculate a crypto key given a password. |
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87 | ## |
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88 | ## This is done by hashing the password 32.000 times MD5 and 32.000 times with MD4. |
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89 | ## These hashes are concatenated and and the first bytes are taken depending on the |
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90 | ## desired key length. |
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91 | ## |
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92 | ## @param pw password to be used (string) |
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93 | ## @param keyLength length of the desired key (16, 24 or 32) (default is |
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94 | ## 32 bytes suitable for AES256 encryption) |
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95 | ## @return crypto key (bytes) |
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96 | ## """ |
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97 | ## if keyLength not in [16, 24, 32]: |
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98 | ## raise ValueError(QCoreApplication.translate( |
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99 | ## "Crypto", "Illegal key length ({0}) given.").format(keyLength)) |
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100 | ## |
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101 | ## hash1 = QCryptographicHash.hash(QByteArray(pw.encode("utf-8")), |
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102 | ## QCryptographicHash.Md5) |
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103 | ## hash2 = QCryptographicHash.hash(QByteArray(pw.encode("utf-8")), |
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104 | ## QCryptographicHash.Md4) |
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105 | ## for i in range(32000): |
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106 | ## hash1 = QCryptographicHash.hash(hash1, QCryptographicHash.Md5) |
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107 | ## hash2 = QCryptographicHash.hash(hash2, QCryptographicHash.Md4) |
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108 | ## hash = (hash1 + hash2)[:keyLength] |
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109 | ## return bytes(hash) |
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110 | |
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111 | |
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112 | def __getMasterPassword(): |
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113 | """ |
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114 | Private module function to get the password from the user. |
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115 | """ |
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116 | global MasterPassword |
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117 | |
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118 | pw, ok = QInputDialog.getText( |
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119 | None, |
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120 | QCoreApplication.translate("Crypto", "Master Password"), |
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121 | QCoreApplication.translate("Crypto", "Enter the master password:"), |
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122 | QLineEdit.Password) |
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123 | if ok: |
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124 | masterPassword = Preferences.getUser("MasterPassword") |
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125 | try: |
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126 | if masterPassword: |
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127 | if verifyPassword(pw, masterPassword): |
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128 | MasterPassword = pwEncode(pw) |
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129 | else: |
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130 | E5MessageBox.warning(None, |
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131 | QCoreApplication.translate("Crypto", "Master Password"), |
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132 | QCoreApplication.translate("Crypto", |
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133 | """The given password is incorrect.""")) |
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134 | else: |
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135 | E5MessageBox.critical(None, |
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136 | QCoreApplication.translate("Crypto", "Master Password"), |
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137 | QCoreApplication.translate("Crypto", |
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138 | """There is no master password registered.""")) |
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139 | except ValueError as why: |
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140 | E5MessageBox.warning(None, |
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141 | QCoreApplication.translate("Crypto", "Master Password"), |
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142 | QCoreApplication.translate("Crypto", |
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143 | """<p>The given password cannot be verified.</p>""" |
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144 | """<p>Reason: {0}""".format(str(why)))) |
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145 | |
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146 | |
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147 | def pwEncrypt(pw, masterPW=None): |
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148 | """ |
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149 | Module function to encrypt a password. |
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150 | |
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151 | @param pw password to encrypt (string) |
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152 | @param masterPW password to be used for encryption (string) |
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153 | @return encrypted password (string) and flag indicating |
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154 | success (boolean) |
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155 | """ |
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156 | if masterPW is None: |
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157 | if MasterPassword is None: |
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158 | __getMasterPassword() |
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159 | if MasterPassword is None: |
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160 | return "", False |
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161 | |
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162 | masterPW = pwDecode(MasterPassword) |
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163 | |
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164 | digestname, iterations, salt, hash = hashPasswordTuple(masterPW) |
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165 | key = hash[:32] |
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166 | try: |
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167 | cipher = encryptData(key, pw.encode("utf-8")) |
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168 | except ValueError: |
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169 | return "", False |
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170 | return CryptoMarker + Delimiter.join([ |
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171 | digestname, |
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172 | str(iterations), |
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173 | base64.b64encode(salt).decode("ascii"), |
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174 | base64.b64encode(cipher).decode("ascii") |
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175 | ]), True |
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176 | |
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177 | |
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178 | def pwDecrypt(epw, masterPW=None): |
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179 | """ |
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180 | Module function to decrypt a password. |
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181 | |
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182 | @param epw hashed password to decrypt (string) |
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183 | @param masterPW password to be used for encryption (string) |
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184 | @return decrypted password (string) and flag indicating |
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185 | success (boolean) |
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186 | """ |
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187 | if not epw.startswith(CryptoMarker): |
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188 | return epw, False # it was not encoded using pwEncrypt |
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189 | |
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190 | if masterPW is None: |
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191 | if MasterPassword is None: |
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192 | __getMasterPassword() |
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193 | if MasterPassword is None: |
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194 | return "", False |
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195 | |
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196 | masterPW = pwDecode(MasterPassword) |
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197 | |
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198 | hashParameters, epw = epw[3:].rsplit(Delimiter, 1) |
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199 | try: |
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200 | # recreate the key used to encrypt |
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201 | key = rehashPassword(masterPW, hashParameters)[:32] |
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202 | plaintext = decryptData(key, base64.b64decode(epw.encode("ascii"))) |
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203 | except ValueError: |
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204 | return "", False |
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205 | return plaintext.decode("utf-8"), True |
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206 | |
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207 | |
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208 | def pwReencrypt(epw, oldPassword, newPassword): |
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209 | """ |
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210 | Module function to re-encrypt a password. |
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211 | |
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212 | @param epw hashed password to re-encrypt (string) |
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213 | @param oldPassword password used to encrypt (string) |
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214 | @param newPassword new password to be used (string) |
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215 | @return encrypted password (string) and flag indicating |
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216 | success (boolean) |
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217 | """ |
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218 | plaintext, ok = pwDecrypt(epw, oldPassword) |
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219 | if ok: |
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220 | return pwEncrypt(plaintext, newPassword) |
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221 | else: |
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222 | return "", False |
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223 | |
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224 | |
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225 | def pwRecode(epw, oldPassword, newPassword): |
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226 | """ |
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227 | Module function to re-encode a password. |
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228 | |
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229 | In case of an error the encoded password is returned unchanged. |
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230 | |
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231 | @param epw encoded password to re-encode (string) |
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232 | @param oldPassword password used to encode (string) |
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233 | @param newPassword new password to be used (string) |
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234 | @return encoded password (string) |
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235 | """ |
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236 | if epw == "": |
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237 | return epw |
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238 | |
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239 | if newPassword == "": |
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240 | plaintext, ok = pwDecrypt(epw) |
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241 | return (pwEncode(plaintext) if ok else epw) |
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242 | else: |
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243 | if oldPassword == "": |
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244 | plaintext = pwDecode(epw) |
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245 | cipher, ok = pwEncrypt(plaintext, newPassword) |
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246 | return (cipher if ok else epw) |
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247 | else: |
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248 | npw, ok = pwReencrypt(epw, oldPassword, newPassword) |
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249 | return (npw if ok else epw) |
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250 | |
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251 | |
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252 | def pwConvert(pw, encode=True): |
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253 | """ |
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254 | Module function to convert a plaintext password to the encoded form or |
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255 | vice versa. |
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256 | |
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257 | If there is an error, an empty code is returned for the encode function |
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258 | or the given encoded password for the decode function. |
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259 | |
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260 | @param pw password to encode (string) |
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261 | @param encode flag indicating an encode or decode function (boolean) |
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262 | @return encode or decoded password (string) |
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263 | """ |
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264 | if pw == "": |
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265 | return pw |
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266 | |
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267 | if encode: |
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268 | # plain text -> encoded |
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269 | if Preferences.getUser("UseMasterPassword"): |
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270 | epw = pwEncrypt(pw)[0] |
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271 | else: |
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272 | epw = pwEncode(pw) |
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273 | return epw |
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274 | else: |
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275 | # encoded -> plain text |
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276 | if Preferences.getUser("UseMasterPassword"): |
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277 | plain, ok = pwDecrypt(pw) |
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278 | else: |
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279 | plain, ok = pwDecode(pw), True |
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280 | return (plain if ok else pw) |
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281 | |
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282 | |
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283 | def changeRememberedMaster(newPassword): |
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284 | """ |
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285 | Module function to change the remembered master password. |
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286 | |
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287 | @param newPassword new password to be used (string) |
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288 | """ |
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289 | global MasterPassword |
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290 | |
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291 | if newPassword == "": |
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292 | MasterPassword = None |
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293 | else: |
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294 | MasterPassword = pwEncode(newPassword) |
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295 | |
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296 | if __name__ == "__main__": |
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297 | import sys |
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298 | from PyQt4.QtGui import QApplication |
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299 | |
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300 | app = QApplication([]) |
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301 | |
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302 | mpw = "blahblah" |
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303 | cpw = "SomeSecret" |
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304 | |
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305 | cipher, ok = pwEncrypt(cpw) |
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306 | print(ok, cipher) |
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307 | plain, ok = pwDecrypt(cipher) |
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308 | print(ok, plain) |
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309 | |
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310 | cipher, ok = pwEncrypt(cpw, mpw) |
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311 | print(ok, cipher) |
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312 | plain, ok = pwDecrypt(cipher, mpw) |
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313 | print(ok, plain) |
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314 | |
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315 | sys.exit(0) |