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annotate roundup/password.py @ 5507:0db3779702d9

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access exception args in a Python 3 compatible way
author Christof Meerwald <cmeerw@cmeerw.org>
date Fri, 17 Aug 2018 19:44:12 +0100
parents 11a1afa3cba4
children 07abc8d36940
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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 """Password handling (encoding, decoding).
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19 """
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20 __docformat__ = 'restructuredtext'
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21
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22 import re, string
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23 from base64 import b64encode, b64decode
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24 from hashlib import md5, sha1
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25
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26 from roundup.anypy.strings import us2s, b2s, s2b
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27 import roundup.anypy.random_ as random_
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28
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29 try:
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30 import crypt
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31 except ImportError:
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32 crypt = None
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33
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34 _bempty = b""
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35 _bjoin = _bempty.join
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36
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37 def bchr(c):
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38 if bytes == str:
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39 # Python 2.
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40 return chr(c)
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41 else:
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42 # Python 3.
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43 return bytes((c,))
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44
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45 def bord(c):
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46 if bytes == str:
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47 # Python 2.
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48 return ord(c)
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49 else:
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50 # Python 3. Elements of bytes are integers.
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51 return c
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52
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53 #NOTE: PBKDF2 hash is using this variant of base64 to minimize encoding size,
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54 # and have charset that's compatible w/ unix crypt variants
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55 def h64encode(data):
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56 """encode using variant of base64"""
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57 return b2s(b64encode(data, b"./").strip(b"=\n"))
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58
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59 def h64decode(data):
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60 """decode using variant of base64"""
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61 data = s2b(data)
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62 off = len(data) % 4
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63 if off == 0:
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64 return b64decode(data, b"./")
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65 elif off == 1:
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66 raise ValueError("Invalid base64 input")
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67 elif off == 2:
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68 return b64decode(data + b"==", b"./")
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69 else:
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70 return b64decode(data + b"=", b"./")
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71
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72 try:
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73 from hashlib import pbkdf2_hmac
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74 def _pbkdf2(password, salt, rounds, keylen):
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75 return pbkdf2_hmac('sha1', password, salt, rounds, keylen)
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76 except ImportError:
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77 #no hashlib.pbkdf2_hmac - make our own pbkdf2 function
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78 from struct import pack
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79 from hmac import HMAC
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80
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81 def xor_bytes(left, right):
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82 "perform bitwise-xor of two byte-strings"
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83 return _bjoin(bchr(bord(l) ^ bord(r)) for l, r in zip(left, right))
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84
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85 def _pbkdf2(password, salt, rounds, keylen):
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86 digest_size = 20 # sha1 generates 20-byte blocks
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87 total_blocks = int((keylen+digest_size-1)/digest_size)
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88 hmac_template = HMAC(password, None, sha1)
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89 out = _bempty
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90 for i in range(1, total_blocks+1):
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91 hmac = hmac_template.copy()
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92 hmac.update(salt + pack(">L",i))
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93 block = tmp = hmac.digest()
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94 for j in range(rounds-1):
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95 hmac = hmac_template.copy()
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96 hmac.update(tmp)
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97 tmp = hmac.digest()
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98 #TODO: need to speed up this call
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99 block = xor_bytes(block, tmp)
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100 out += block
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101 return out[:keylen]
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102
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103 def ssha(password, salt):
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104 ''' Make ssha digest from password and salt.
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105 Based on code of Roberto Aguilar <roberto@baremetal.io>
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106 https://gist.github.com/rca/7217540
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107 '''
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108 shaval = sha1(password)
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109 shaval.update( salt )
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110 ssha_digest = b64encode( shaval.digest() + salt ).strip()
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111 return ssha_digest
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112
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113 def pbkdf2(password, salt, rounds, keylen):
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114 """pkcs#5 password-based key derivation v2.0
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115
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116 :arg password: passphrase to use to generate key (if unicode, converted to utf-8)
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117 :arg salt: salt bytes to use when generating key
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118 :param rounds: number of rounds to use to generate key
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119 :arg keylen: number of bytes to generate
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120
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121 If hashlib supports pbkdf2, uses it's implementation as backend.
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122
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123 :returns:
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124 raw bytes of generated key
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125 """
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126 password = s2b(us2s(password))
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127 if keylen > 40:
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128 #NOTE: pbkdf2 allows up to (2**31-1)*20 bytes,
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129 # but m2crypto has issues on some platforms above 40,
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130 # and such sizes aren't needed for a password hash anyways...
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131 raise ValueError("key length too large")
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diff changeset
132 if rounds < 1:
5378
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parents: 5356
diff changeset
133 raise ValueError("rounds must be positive number")
4480
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diff changeset
134 return _pbkdf2(password, salt, rounds, keylen)
1613754d2646 Fix first part of Password handling security issue2550688
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parents: 4089
diff changeset
135
1905
dc43e339e607 Centralised conversion of user-input data to hyperdb values
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diff changeset
136 class PasswordValueError(ValueError):
4089
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parents: 3439
diff changeset
137 """ The password value is not valid """
1905
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parents: 1583
diff changeset
138 pass
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diff changeset
139
4484
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diff changeset
140 def pbkdf2_unpack(pbkdf2):
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4483
diff changeset
141 """ unpack pbkdf2 encrypted password into parts,
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4483
diff changeset
142 assume it has format "{rounds}${salt}${digest}
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4483
diff changeset
143 """
5416
56c9bcdea47f Python 3 preparation: unicode.
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parents: 5415
diff changeset
144 pbkdf2 = us2s(pbkdf2)
4484
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parents: 4483
diff changeset
145 try:
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parents: 4483
diff changeset
146 rounds, salt, digest = pbkdf2.split("$")
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
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parents: 4483
diff changeset
147 except ValueError:
5378
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parents: 5356
diff changeset
148 raise PasswordValueError("invalid PBKDF2 hash (wrong number of separators)")
4484
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parents: 4483
diff changeset
149 if rounds.startswith("0"):
5378
35ea9b1efc14 Python 3 preparation: "raise" syntax.
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parents: 5356
diff changeset
150 raise PasswordValueError("invalid PBKDF2 hash (zero-padded rounds)")
4484
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4483
diff changeset
151 try:
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parents: 4483
diff changeset
152 rounds = int(rounds)
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parents: 4483
diff changeset
153 except ValueError:
5378
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parents: 5356
diff changeset
154 raise PasswordValueError("invalid PBKDF2 hash (invalid rounds)")
4484
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4483
diff changeset
155 raw_salt = h64decode(salt)
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
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parents: 4483
diff changeset
156 return rounds, salt, raw_salt, digest
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parents: 4483
diff changeset
157
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diff changeset
158 def encodePassword(plaintext, scheme, other=None, config=None):
4089
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parents: 3439
diff changeset
159 """Encrypt the plaintext password.
eddb82d0964c Add compatibility package to allow us to deal with Python versions 2.3..2.6.
Richard Jones <richard@users.sourceforge.net>
parents: 3439
diff changeset
160 """
1343
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parents: 1231
diff changeset
161 if plaintext is None:
2e557762ee87 fixed handling of missing password [SF#655632]
Richard Jones <richard@users.sourceforge.net>
parents: 1231
diff changeset
162 plaintext = ""
4480
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diff changeset
163 if scheme == "PBKDF2":
1613754d2646 Fix first part of Password handling security issue2550688
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parents: 4089
diff changeset
164 if other:
4484
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parents: 4483
diff changeset
165 rounds, salt, raw_salt, digest = pbkdf2_unpack(other)
4480
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diff changeset
166 else:
5488
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
167 raw_salt = random_.token_bytes(20)
4480
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diff changeset
168 salt = h64encode(raw_salt)
4486
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parents: 4485
diff changeset
169 if config:
693c75d56ebe Add new config-option 'password_pbkdf2_default_rounds'...
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parents: 4485
diff changeset
170 rounds = config.PASSWORD_PBKDF2_DEFAULT_ROUNDS
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parents: 4485
diff changeset
171 else:
693c75d56ebe Add new config-option 'password_pbkdf2_default_rounds'...
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diff changeset
172 rounds = 10000
4480
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diff changeset
173 if rounds < 1000:
5378
35ea9b1efc14 Python 3 preparation: "raise" syntax.
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parents: 5356
diff changeset
174 raise PasswordValueError("invalid PBKDF2 hash (rounds too low)")
4480
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parents: 4089
diff changeset
175 raw_digest = pbkdf2(plaintext, raw_salt, rounds, 20)
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parents: 4089
diff changeset
176 return "%d$%s$%s" % (rounds, salt, h64encode(raw_digest))
5053
9792b18e0b19 issue 2550880: Ability to choose password store scheme and SSHA support.
John Rouillard <rouilj@ieee.org>
parents: 4982
diff changeset
177 elif scheme == 'SSHA':
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parents: 4982
diff changeset
178 if other:
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John Rouillard <rouilj@ieee.org>
parents: 4982
diff changeset
179 raw_other = b64decode(other)
9792b18e0b19 issue 2550880: Ability to choose password store scheme and SSHA support.
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parents: 4982
diff changeset
180 salt = raw_other[20:]
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John Rouillard <rouilj@ieee.org>
parents: 4982
diff changeset
181 else:
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John Rouillard <rouilj@ieee.org>
parents: 4982
diff changeset
182 #new password
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parents: 4982
diff changeset
183 # variable salt length
5488
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parents: 5483
diff changeset
184 salt_len = random_.randbelow(52-36) + 36
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
185 salt = random_.token_bytes(salt_len)
5454
fbbcbfc6dad0 fix encoding for hash functions
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5428
diff changeset
186 s = ssha(s2b(plaintext), salt)
4480
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parents: 4089
diff changeset
187 elif scheme == 'SHA':
5454
fbbcbfc6dad0 fix encoding for hash functions
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5428
diff changeset
188 s = sha1(s2b(plaintext)).hexdigest()
2277
c9e52addda42 added MD5 scheme for password hiding
Richard Jones <richard@users.sourceforge.net>
parents: 2098
diff changeset
189 elif scheme == 'MD5':
5454
fbbcbfc6dad0 fix encoding for hash functions
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5428
diff changeset
190 s = md5(s2b(plaintext)).hexdigest()
1229
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Richard Jones <richard@users.sourceforge.net>
parents: 1090
diff changeset
191 elif scheme == 'crypt' and crypt is not None:
5c581b120738 added "crypt" password encoding...
Richard Jones <richard@users.sourceforge.net>
parents: 1090
diff changeset
192 if other is not None:
3434
1f860b50fa5f encodePassword: don't trim the salt string...
Alexander Smishlajev <a1s@users.sourceforge.net>
parents: 2277
diff changeset
193 salt = other
1229
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Richard Jones <richard@users.sourceforge.net>
parents: 1090
diff changeset
194 else:
5415
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parents: 5414
diff changeset
195 saltchars = './0123456789'+string.ascii_letters
5488
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
196 salt = random_.choice(saltchars) + random_.choice(saltchars)
1229
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diff changeset
197 s = crypt.crypt(plaintext, salt)
270
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
198 elif scheme == 'plaintext':
1229
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parents: 1090
diff changeset
199 s = plaintext
270
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
200 else:
5378
35ea9b1efc14 Python 3 preparation: "raise" syntax.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5356
diff changeset
201 raise PasswordValueError('Unknown encryption scheme %r'%scheme)
270
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
202 return s
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
203
4760
efdce3d32698 Increase generated password length to 12 symbols.
anatoly techtonik <techtonik@gmail.com>
parents: 4683
diff changeset
204 def generatePassword(length=12):
5415
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parents: 5414
diff changeset
205 chars = string.ascii_letters+string.digits
5488
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
206 password = [random_.choice(chars) for x in range(length - 1)]
4760
efdce3d32698 Increase generated password length to 12 symbols.
anatoly techtonik <techtonik@gmail.com>
parents: 4683
diff changeset
207 # make sure there is at least one digit
5488
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
208 digitidx = random_.randbelow(length)
52cb53eedf77 reworked random number use
Christof Meerwald <cmeerw@cmeerw.org>
parents: 5483
diff changeset
209 password[digitidx:digitidx] = [random_.choice(string.digits)]
4760
efdce3d32698 Increase generated password length to 12 symbols.
anatoly techtonik <techtonik@gmail.com>
parents: 4683
diff changeset
210 return ''.join(password)
1583
caae7d8934dc set new email rego user password to random string
Richard Jones <richard@users.sourceforge.net>
parents: 1343
diff changeset
211
4483
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
212 class JournalPassword:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
213 """ Password dummy instance intended for journal operation.
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
214 We do not store passwords in the journal any longer. The dummy
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
215 version only reads the encryption scheme from the given
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
216 encrypted password.
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
217 """
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
218 default_scheme = 'PBKDF2' # new encryptions use this scheme
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
219 pwre = re.compile(r'{(\w+)}(.+)')
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
220
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
221 def __init__ (self, encrypted=''):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
222 if isinstance(encrypted, self.__class__):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
223 self.scheme = encrypted.scheme or self.default_scheme
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
224 else:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
225 m = self.pwre.match(encrypted)
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
226 if m:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
227 self.scheme = m.group(1)
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
228 else:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
229 self.scheme = self.default_scheme
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
230 self.password = ''
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
231
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
232 def dummystr(self):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
233 """ return dummy string to store in journal
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
234 - reports scheme, but nothing else
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
235 """
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
236 return "{%s}*encrypted*" % (self.scheme,)
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
237
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
238 __str__ = dummystr
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
239
5414
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Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
240 def __eq__(self, other):
4483
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
241 """Compare this password against another password."""
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
242 # check to see if we're comparing instances
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
243 if isinstance(other, self.__class__):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
244 if self.scheme != other.scheme:
5414
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
245 return False
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
246 return self.password == other.password
4483
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
247
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
248 # assume password is plaintext
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
249 if self.password is None:
5378
35ea9b1efc14 Python 3 preparation: "raise" syntax.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5356
diff changeset
250 raise ValueError('Password not set')
5414
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
251 return self.password == encodePassword(other, self.scheme,
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
252 self.password or None)
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
253
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
254 def __ne__(self, other):
3fa026621f69 Python 3 preparation: comparisons.
Joseph Myers <jsm@polyomino.org.uk>
parents: 5391
diff changeset
255 return not self.__eq__(other)
4483
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
256
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
257 class Password(JournalPassword):
4089
eddb82d0964c Add compatibility package to allow us to deal with Python versions 2.3..2.6.
Richard Jones <richard@users.sourceforge.net>
parents: 3439
diff changeset
258 """The class encapsulates a Password property type value in the database.
270
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
259
2277
c9e52addda42 added MD5 scheme for password hiding
Richard Jones <richard@users.sourceforge.net>
parents: 2098
diff changeset
260 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
c9e52addda42 added MD5 scheme for password hiding
Richard Jones <richard@users.sourceforge.net>
parents: 2098
diff changeset
261 The encodePassword function is used to actually encode the password from
270
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
262 plaintext. The None encoding is used in legacy databases where no
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263 encoding scheme is identified.
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264
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265 The scheme is stored with the encoded data in the database:
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266 {scheme}data
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267
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268 Example usage:
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269 >>> p = Password('sekrit')
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270 >>> p == 'sekrit'
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271 1
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272 >>> p != 'not sekrit'
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273 1
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274 >>> 'sekrit' == p
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275 1
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276 >>> 'not sekrit' != p
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277 1
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278 """
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279 #TODO: code to migrate from old password schemes.
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280
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281 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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282 known_schemes = ["PBKDF2", "SSHA"] + deprecated_schemes
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283
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284 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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285 """Call setPassword if plaintext is not None."""
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286 if scheme is None:
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287 scheme = self.default_scheme
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288 if plaintext is not None:
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289 self.setPassword (plaintext, scheme, config=config)
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290 elif encrypted is not None:
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291 self.unpack(encrypted, scheme, strict=strict, config=config)
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292 else:
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293 self.scheme = self.default_scheme
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294 self.password = None
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295 self.plaintext = None
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296
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297 def needs_migration(self):
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298 """ Password has insecure scheme or other insecure parameters
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299 and needs migration to new password scheme
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300 """
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301 if self.scheme in self.deprecated_schemes:
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302 return True
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303 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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304 if rounds < 1000:
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305 return True
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306 return False
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307
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308 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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309 """Set the password info from the scheme:<encryted info> string
270
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310 (the inverse of __str__)
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311 """
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312 m = self.pwre.match(encrypted)
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313 if m:
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314 self.scheme = m.group(1)
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315 self.password = m.group(2)
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316 self.plaintext = None
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317 else:
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318 # currently plaintext - encrypt
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319 self.setPassword(encrypted, scheme, config=config)
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320 if strict and self.scheme not in self.known_schemes:
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321 raise PasswordValueError("Unknown encryption scheme: %r" % (self.scheme,))
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322
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323 def setPassword(self, plaintext, scheme=None, config=None):
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324 """Sets encrypts plaintext."""
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325 if scheme is None:
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326 scheme = self.default_scheme
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327 self.scheme = scheme
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328 self.password = encodePassword(plaintext, scheme, config=config)
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329 self.plaintext = plaintext
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330
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331 def __str__(self):
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332 """Stringify the encrypted password for database storage."""
270
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333 if self.password is None:
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334 raise ValueError('Password not set')
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335 return '{%s}%s'%(self.scheme, self.password)
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336
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337 def test():
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338 # SHA
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339 p = Password('sekrit')
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340 assert p == 'sekrit'
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341 assert p != 'not sekrit'
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342 assert 'sekrit' == p
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343 assert 'not sekrit' != p
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344
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345 # MD5
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346 p = Password('sekrit', 'MD5')
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347 assert p == 'sekrit'
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348 assert p != 'not sekrit'
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349 assert 'sekrit' == p
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350 assert 'not sekrit' != p
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351
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352 # crypt
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353 if crypt: # not available on Windows
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354 p = Password('sekrit', 'crypt')
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355 assert p == 'sekrit'
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356 assert p != 'not sekrit'
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357 assert 'sekrit' == p
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358 assert 'not sekrit' != p
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359
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360 # SSHA
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361 p = Password('sekrit', 'SSHA')
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362 assert p == 'sekrit'
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363 assert p != 'not sekrit'
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364 assert 'sekrit' == p
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365 assert 'not sekrit' != p
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diff changeset
366
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367 # PBKDF2 - low level function
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368 from binascii import unhexlify
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369 k = pbkdf2("password", b"ATHENA.MIT.EDUraeburn", 1200, 32)
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370 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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371
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372 # PBKDF2 - hash function
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373 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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374 assert encodePassword("sekrit", "PBKDF2", h) == h
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375
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376 # PBKDF2 - high level integration
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377 p = Password('sekrit', 'PBKDF2')
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diff changeset
378 assert p == 'sekrit'
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diff changeset
379 assert p != 'not sekrit'
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diff changeset
380 assert 'sekrit' == p
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diff changeset
381 assert 'not sekrit' != p
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382
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383 if __name__ == '__main__':
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384 test()
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385
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diff changeset
386 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/