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annotate roundup/password.py @ 5391:a391a071d045

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Python 3 preparation: use range() instead of xrange(). Tool-assisted patch. None of the existing range() uses seem to need to be wrapped in list(). Note that range() may be less efficient than xrange() in Python 2.
author Joseph Myers <jsm@polyomino.org.uk>
date Tue, 24 Jul 2018 23:00:54 +0000
parents 35ea9b1efc14
children 3fa026621f69
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, random
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23 import os
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24 from base64 import b64encode, b64decode
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25 from hashlib import md5, sha1
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26
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27 try:
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28 import crypt
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29 except ImportError:
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30 crypt = None
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31
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32 _bempty = ""
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33 _bjoin = _bempty.join
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34
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35 def getrandbytes(count):
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36 return _bjoin(chr(random.randint(0,255)) for i in range(count))
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37
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38 #NOTE: PBKDF2 hash is using this variant of base64 to minimize encoding size,
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39 # and have charset that's compatible w/ unix crypt variants
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40 def h64encode(data):
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41 """encode using variant of base64"""
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42 return b64encode(data, "./").strip("=\n")
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43
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44 def h64decode(data):
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45 """decode using variant of base64"""
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46 off = len(data) % 4
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47 if off == 0:
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48 return b64decode(data, "./")
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49 elif off == 1:
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50 raise ValueError("Invalid base64 input")
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51 elif off == 2:
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52 return b64decode(data + "==", "./")
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53 else:
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54 return b64decode(data + "=", "./")
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55
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56 try:
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57 from M2Crypto.EVP import pbkdf2 as _pbkdf2
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58 except ImportError:
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59 #no m2crypto - make our own pbkdf2 function
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60 from struct import pack
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61 from hmac import HMAC
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62
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63 def xor_bytes(left, right):
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64 "perform bitwise-xor of two byte-strings"
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65 return _bjoin(chr(ord(l) ^ ord(r)) for l, r in zip(left, right))
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66
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67 def _pbkdf2(password, salt, rounds, keylen):
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68 digest_size = 20 # sha1 generates 20-byte blocks
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69 total_blocks = int((keylen+digest_size-1)/digest_size)
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70 hmac_template = HMAC(password, None, sha1)
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71 out = _bempty
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72 for i in range(1, total_blocks+1):
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73 hmac = hmac_template.copy()
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74 hmac.update(salt + pack(">L",i))
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75 block = tmp = hmac.digest()
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76 for j in range(rounds-1):
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77 hmac = hmac_template.copy()
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78 hmac.update(tmp)
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79 tmp = hmac.digest()
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80 #TODO: need to speed up this call
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81 block = xor_bytes(block, tmp)
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82 out += block
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83 return out[:keylen]
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84
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85 def ssha(password, salt):
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86 ''' Make ssha digest from password and salt.
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87 Based on code of Roberto Aguilar <roberto@baremetal.io>
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88 https://gist.github.com/rca/7217540
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89 '''
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90 shaval = sha1(password)
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91 shaval.update( salt )
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92 ssha_digest = b64encode( '{}{}'.format(shaval.digest(), salt) ).strip()
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93 return ssha_digest
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94
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95 def pbkdf2(password, salt, rounds, keylen):
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96 """pkcs#5 password-based key derivation v2.0
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97
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98 :arg password: passphrase to use to generate key (if unicode, converted to utf-8)
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99 :arg salt: salt string to use when generating key (if unicode, converted to utf-8)
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100 :param rounds: number of rounds to use to generate key
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101 :arg keylen: number of bytes to generate
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102
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103 If M2Crypto is present, uses it's implementation as backend.
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104
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105 :returns:
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106 raw bytes of generated key
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107 """
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108 if isinstance(password, unicode):
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109 password = password.encode("utf-8")
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110 if isinstance(salt, unicode):
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111 salt = salt.encode("utf-8")
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112 if keylen > 40:
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113 #NOTE: pbkdf2 allows up to (2**31-1)*20 bytes,
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114 # but m2crypto has issues on some platforms above 40,
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115 # and such sizes aren't needed for a password hash anyways...
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116 raise ValueError("key length too large")
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117 if rounds < 1:
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118 raise ValueError("rounds must be positive number")
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119 return _pbkdf2(password, salt, rounds, keylen)
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120
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121 class PasswordValueError(ValueError):
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122 """ The password value is not valid """
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123 pass
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124
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125 def pbkdf2_unpack(pbkdf2):
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126 """ unpack pbkdf2 encrypted password into parts,
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127 assume it has format "{rounds}${salt}${digest}
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128 """
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129 if isinstance(pbkdf2, unicode):
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130 pbkdf2 = pbkdf2.encode("ascii")
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diff changeset
131 try:
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diff changeset
132 rounds, salt, digest = pbkdf2.split("$")
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diff changeset
133 except ValueError:
5378
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diff changeset
134 raise PasswordValueError("invalid PBKDF2 hash (wrong number of separators)")
4484
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diff changeset
135 if rounds.startswith("0"):
5378
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parents: 5356
diff changeset
136 raise PasswordValueError("invalid PBKDF2 hash (zero-padded rounds)")
4484
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diff changeset
137 try:
52e13bf0bb40 Add new config-option 'migrate_passwords' in section 'web'...
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diff changeset
138 rounds = int(rounds)
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diff changeset
139 except ValueError:
5378
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diff changeset
140 raise PasswordValueError("invalid PBKDF2 hash (invalid rounds)")
4484
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diff changeset
141 raw_salt = h64decode(salt)
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diff changeset
142 return rounds, salt, raw_salt, digest
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143
4486
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diff changeset
144 def encodePassword(plaintext, scheme, other=None, config=None):
4089
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diff changeset
145 """Encrypt the plaintext password.
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146 """
1343
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diff changeset
147 if plaintext is None:
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diff changeset
148 plaintext = ""
4480
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diff changeset
149 if scheme == "PBKDF2":
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diff changeset
150 if other:
4484
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diff changeset
151 rounds, salt, raw_salt, digest = pbkdf2_unpack(other)
4480
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diff changeset
152 else:
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153 raw_salt = getrandbytes(20)
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diff changeset
154 salt = h64encode(raw_salt)
4486
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155 if config:
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diff changeset
156 rounds = config.PASSWORD_PBKDF2_DEFAULT_ROUNDS
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diff changeset
157 else:
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158 rounds = 10000
4480
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diff changeset
159 if rounds < 1000:
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diff changeset
160 raise PasswordValueError("invalid PBKDF2 hash (rounds too low)")
4480
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diff changeset
161 raw_digest = pbkdf2(plaintext, raw_salt, rounds, 20)
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diff changeset
162 return "%d$%s$%s" % (rounds, salt, h64encode(raw_digest))
5053
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diff changeset
163 elif scheme == 'SSHA':
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parents: 4982
diff changeset
164 if other:
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parents: 4982
diff changeset
165 raw_other = b64decode(other)
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166 salt = raw_other[20:]
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diff changeset
167 else:
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diff changeset
168 #new password
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169 # variable salt length
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diff changeset
170 salt_len = random.randrange(36, 52)
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diff changeset
171 salt = os.urandom(salt_len)
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diff changeset
172 s = ssha(plaintext, salt)
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diff changeset
173 elif scheme == 'SHA':
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diff changeset
174 s = sha1(plaintext).hexdigest()
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diff changeset
175 elif scheme == 'MD5':
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diff changeset
176 s = md5(plaintext).hexdigest()
1229
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diff changeset
177 elif scheme == 'crypt' and crypt is not None:
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diff changeset
178 if other is not None:
3434
1f860b50fa5f encodePassword: don't trim the salt string...
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diff changeset
179 salt = other
1229
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diff changeset
180 else:
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diff changeset
181 saltchars = './0123456789'+string.letters
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diff changeset
182 salt = random.choice(saltchars) + random.choice(saltchars)
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diff changeset
183 s = crypt.crypt(plaintext, salt)
270
a4241ddd22d7 Added the Password property type.
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diff changeset
184 elif scheme == 'plaintext':
1229
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185 s = plaintext
270
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186 else:
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diff changeset
187 raise PasswordValueError('Unknown encryption scheme %r'%scheme)
270
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188 return s
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diff changeset
189
4760
efdce3d32698 Increase generated password length to 12 symbols.
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diff changeset
190 def generatePassword(length=12):
1583
caae7d8934dc set new email rego user password to random string
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diff changeset
191 chars = string.letters+string.digits
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diff changeset
192 password = [random.choice(chars) for x in range(length)]
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diff changeset
193 # make sure there is at least one digit
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diff changeset
194 password[0] = random.choice(string.digits)
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diff changeset
195 random.shuffle(password)
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diff changeset
196 return ''.join(password)
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diff changeset
197
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diff changeset
198 class JournalPassword:
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diff changeset
199 """ Password dummy instance intended for journal operation.
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diff changeset
200 We do not store passwords in the journal any longer. The dummy
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diff changeset
201 version only reads the encryption scheme from the given
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
202 encrypted password.
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diff changeset
203 """
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diff changeset
204 default_scheme = 'PBKDF2' # new encryptions use this scheme
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diff changeset
205 pwre = re.compile(r'{(\w+)}(.+)')
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diff changeset
206
22bc0426e348 Second patch from issue2550688 -- with some changes:
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diff changeset
207 def __init__ (self, encrypted=''):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
208 if isinstance(encrypted, self.__class__):
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parents: 4480
diff changeset
209 self.scheme = encrypted.scheme or self.default_scheme
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diff changeset
210 else:
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parents: 4480
diff changeset
211 m = self.pwre.match(encrypted)
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
212 if m:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
213 self.scheme = m.group(1)
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diff changeset
214 else:
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diff changeset
215 self.scheme = self.default_scheme
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diff changeset
216 self.password = ''
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diff changeset
217
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
218 def dummystr(self):
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
219 """ return dummy string to store in journal
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
220 - reports scheme, but nothing else
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
221 """
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
222 return "{%s}*encrypted*" % (self.scheme,)
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diff changeset
223
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
224 __str__ = dummystr
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diff changeset
225
22bc0426e348 Second patch from issue2550688 -- with some changes:
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diff changeset
226 def __cmp__(self, other):
22bc0426e348 Second patch from issue2550688 -- with some changes:
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parents: 4480
diff changeset
227 """Compare this password against another password."""
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Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
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diff changeset
228 # check to see if we're comparing instances
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parents: 4480
diff changeset
229 if isinstance(other, self.__class__):
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
230 if self.scheme != other.scheme:
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
231 return cmp(self.scheme, other.scheme)
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parents: 4480
diff changeset
232 return cmp(self.password, other.password)
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parents: 4480
diff changeset
233
22bc0426e348 Second patch from issue2550688 -- with some changes:
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parents: 4480
diff changeset
234 # assume password is plaintext
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
235 if self.password is None:
5378
35ea9b1efc14 Python 3 preparation: "raise" syntax.
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diff changeset
236 raise ValueError('Password not set')
4483
22bc0426e348 Second patch from issue2550688 -- with some changes:
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parents: 4480
diff changeset
237 return cmp(self.password, encodePassword(other, self.scheme,
22bc0426e348 Second patch from issue2550688 -- with some changes:
Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net>
parents: 4480
diff changeset
238 self.password or None))
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parents: 4480
diff changeset
239
22bc0426e348 Second patch from issue2550688 -- with some changes:
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parents: 4480
diff changeset
240 class Password(JournalPassword):
4089
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parents: 3439
diff changeset
241 """The class encapsulates a Password property type value in the database.
270
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
242
2277
c9e52addda42 added MD5 scheme for password hiding
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parents: 2098
diff changeset
243 The encoding of the password is one if None, 'SHA', 'MD5' or 'plaintext'.
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diff changeset
244 The encodePassword function is used to actually encode the password from
270
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
245 plaintext. The None encoding is used in legacy databases where no
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
246 encoding scheme is identified.
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
247
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parents:
diff changeset
248 The scheme is stored with the encoded data in the database:
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
249 {scheme}data
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
250
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
251 Example usage:
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
252 >>> p = Password('sekrit')
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parents:
diff changeset
253 >>> p == 'sekrit'
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
254 1
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
255 >>> p != 'not sekrit'
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
256 1
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
257 >>> 'sekrit' == p
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
258 1
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
259 >>> 'not sekrit' != p
a4241ddd22d7 Added the Password property type.
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parents:
diff changeset
260 1
4089
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parents: 3439
diff changeset
261 """
4480
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parents: 4089
diff changeset
262 #TODO: code to migrate from old password schemes.
270
a4241ddd22d7 Added the Password property type.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
263
4485
95aace124a8e use idea from Eli Collins to use a list of deprecated password encoding schemes
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264 deprecated_schemes = ["SHA", "MD5", "crypt", "plaintext"]
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265 known_schemes = ["PBKDF2", "SSHA"] + deprecated_schemes
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266
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267 def __init__(self, plaintext=None, scheme=None, encrypted=None, strict=False, config=None):
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268 """Call setPassword if plaintext is not None."""
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269 if scheme is None:
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270 scheme = self.default_scheme
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271 if plaintext is not None:
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272 self.setPassword (plaintext, scheme, config=config)
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273 elif encrypted is not None:
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274 self.unpack(encrypted, scheme, strict=strict, config=config)
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275 else:
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276 self.scheme = self.default_scheme
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277 self.password = None
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278 self.plaintext = None
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279
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280 def needs_migration(self):
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281 """ Password has insecure scheme or other insecure parameters
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282 and needs migration to new password scheme
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283 """
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284 if self.scheme in self.deprecated_schemes:
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285 return True
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286 rounds, salt, raw_salt, digest = pbkdf2_unpack(self.password)
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287 if rounds < 1000:
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288 return True
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289 return False
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290
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291 def unpack(self, encrypted, scheme=None, strict=False, config=None):
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292 """Set the password info from the scheme:<encryted info> string
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293 (the inverse of __str__)
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294 """
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295 m = self.pwre.match(encrypted)
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296 if m:
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297 self.scheme = m.group(1)
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298 self.password = m.group(2)
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299 self.plaintext = None
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300 else:
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301 # currently plaintext - encrypt
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302 self.setPassword(encrypted, scheme, config=config)
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303 if strict and self.scheme not in self.known_schemes:
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304 raise PasswordValueError("Unknown encryption scheme: %r" % (self.scheme,))
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305
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306 def setPassword(self, plaintext, scheme=None, config=None):
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307 """Sets encrypts plaintext."""
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308 if scheme is None:
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309 scheme = self.default_scheme
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310 self.scheme = scheme
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311 self.password = encodePassword(plaintext, scheme, config=config)
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312 self.plaintext = plaintext
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313
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314 def __str__(self):
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315 """Stringify the encrypted password for database storage."""
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316 if self.password is None:
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317 raise ValueError('Password not set')
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318 return '{%s}%s'%(self.scheme, self.password)
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319
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320 def test():
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321 # SHA
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322 p = Password('sekrit')
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323 assert p == 'sekrit'
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324 assert p != 'not sekrit'
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325 assert 'sekrit' == p
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326 assert 'not sekrit' != p
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327
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328 # MD5
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329 p = Password('sekrit', 'MD5')
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330 assert p == 'sekrit'
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331 assert p != 'not sekrit'
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332 assert 'sekrit' == p
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333 assert 'not sekrit' != p
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334
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335 # crypt
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336 if crypt: # not available on Windows
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337 p = Password('sekrit', 'crypt')
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338 assert p == 'sekrit'
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339 assert p != 'not sekrit'
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340 assert 'sekrit' == p
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341 assert 'not sekrit' != p
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342
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343 # SSHA
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344 p = Password('sekrit', 'SSHA')
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345 assert p == 'sekrit'
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346 assert p != 'not sekrit'
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347 assert 'sekrit' == p
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348 assert 'not sekrit' != p
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diff changeset
349
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diff changeset
350 # PBKDF2 - low level function
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351 from binascii import unhexlify
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352 k = pbkdf2("password", "ATHENA.MIT.EDUraeburn", 1200, 32)
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diff changeset
353 assert k == unhexlify("5c08eb61fdf71e4e4ec3cf6ba1f5512ba7e52ddbc5e5142f708a31e2e62b1e13")
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354
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355 # PBKDF2 - hash function
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diff changeset
356 h = "5000$7BvbBq.EZzz/O0HuwX3iP.nAG3s$g3oPnFFaga2BJaX5PoPRljl4XIE"
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diff changeset
357 assert encodePassword("sekrit", "PBKDF2", h) == h
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358
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diff changeset
359 # PBKDF2 - high level integration
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diff changeset
360 p = Password('sekrit', 'PBKDF2')
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diff changeset
361 assert p == 'sekrit'
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362 assert p != 'not sekrit'
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diff changeset
363 assert 'sekrit' == p
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364 assert 'not sekrit' != p
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365
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366 if __name__ == '__main__':
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367 test()
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368
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diff changeset
369 # vim: set filetype=python sts=4 sw=4 et si :
Roundup Issue Tracker: http://roundup-tracker.org/