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annotate roundup/password.py @ 1623:1bad1538f8d2 maint-0.5

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fixed sync between HEAD and maint-0-5 CHANGES
author Richard Jones <richard@users.sourceforge.net>
date Sun, 27 Apr 2003 02:31:30 +0000
parents 6d1af2e441f4
children
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 # $Id: password.py,v 1.8.2.1 2003-04-24 07:49:33 richard Exp $
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19
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20 __doc__ = """
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21 Password handling (encoding, decoding).
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22 """
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23
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24 import sha, re, string, random
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25 try:
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26 import crypt
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27 except:
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28 crypt = None
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29 pass
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30
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31 def encodePassword(plaintext, scheme, other=None):
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32 '''Encrypt the plaintext password.
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33 '''
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34 if plaintext is None:
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35 plaintext = ""
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36 if scheme == 'SHA':
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37 s = sha.sha(plaintext).hexdigest()
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38 elif scheme == 'crypt' and crypt is not None:
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39 if other is not None:
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40 salt = other[:2]
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41 else:
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42 saltchars = './0123456789'+string.letters
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43 salt = random.choice(saltchars) + random.choice(saltchars)
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44 s = crypt.crypt(plaintext, salt)
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45 elif scheme == 'plaintext':
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46 s = plaintext
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47 else:
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48 raise ValueError, 'Unknown encryption scheme "%s"'%scheme
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49 return s
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50
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51 def generatePassword(length=8):
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52 chars = string.letters+string.digits
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53 return ''.join([random.choice(chars) for x in range(length)])
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54
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55 class Password:
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56 '''The class encapsulates a Password property type value in the database.
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57
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58 The encoding of the password is one if None, 'SHA' or 'plaintext'. The
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59 encodePassword function is used to actually encode the password from
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60 plaintext. The None encoding is used in legacy databases where no
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61 encoding scheme is identified.
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62
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63 The scheme is stored with the encoded data in the database:
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64 {scheme}data
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65
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66 Example usage:
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67 >>> p = Password('sekrit')
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68 >>> p == 'sekrit'
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69 1
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70 >>> p != 'not sekrit'
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71 1
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72 >>> 'sekrit' == p
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73 1
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74 >>> 'not sekrit' != p
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75 1
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76 '''
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77
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78 default_scheme = 'SHA' # new encryptions use this scheme
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79 pwre = re.compile(r'{(\w+)}(.+)')
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80
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81 def __init__(self, plaintext=None, scheme=None):
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82 '''Call setPassword if plaintext is not None.'''
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83 if scheme is None:
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84 scheme = self.default_scheme
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85 if plaintext is not None:
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86 self.password = encodePassword(plaintext, self.default_scheme)
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87 self.scheme = self.default_scheme
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88 else:
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89 self.password = None
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90 self.scheme = self.default_scheme
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91
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92 def unpack(self, encrypted):
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93 '''Set the password info from the scheme:<encryted info> string
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94 (the inverse of __str__)
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95 '''
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96 m = self.pwre.match(encrypted)
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97 if m:
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98 self.scheme = m.group(1)
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99 self.password = m.group(2)
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100 else:
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101 # currently plaintext - encrypt
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102 self.password = encodePassword(encrypted, self.default_scheme)
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103 self.scheme = self.default_scheme
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104
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105 def setPassword(self, plaintext, scheme=None):
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106 '''Sets encrypts plaintext.'''
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107 if scheme is None:
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108 scheme = self.default_scheme
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109 self.password = encodePassword(plaintext, scheme)
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110
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111 def __cmp__(self, other):
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112 '''Compare this password against another password.'''
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113 # check to see if we're comparing instances
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114 if isinstance(other, Password):
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115 if self.scheme != other.scheme:
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116 return cmp(self.scheme, other.scheme)
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117 return cmp(self.password, other.password)
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118
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119 # assume password is plaintext
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120 if self.password is None:
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121 raise ValueError, 'Password not set'
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122 return cmp(self.password, encodePassword(other, self.scheme,
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123 self.password))
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124
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125 def __str__(self):
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126 '''Stringify the encrypted password for database storage.'''
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127 if self.password is None:
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128 raise ValueError, 'Password not set'
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129 return '{%s}%s'%(self.scheme, self.password)
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130
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131 def test():
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132 # SHA
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133 p = Password('sekrit')
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134 assert p == 'sekrit'
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135 assert p != 'not sekrit'
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136 assert 'sekrit' == p
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137 assert 'not sekrit' != p
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138
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139 # crypt
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140 p = Password('sekrit', 'crypt')
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141 assert p == 'sekrit'
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142 assert p != 'not sekrit'
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143 assert 'sekrit' == p
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144 assert 'not sekrit' != p
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145
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146 if __name__ == '__main__':
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147 test()
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148
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149 # vim: set filetype=python ts=4 sw=4 et si
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